android camera
最简单直接了解android camera的方法：
看一下源代码就好了是吧？
后面会对函数做一些说明 做翻译吧
/*
* Copyright (C) 2008 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android.hardware;
import static android.system.OsConstants.*;
import android.annotation.SdkConstant;
import android.annotation.SdkConstant.SdkConstantType;
import android.app.ActivityThread;
import android.content.Context;
import android.graphics.ImageFormat;
import android.graphics.Point;
import android.graphics.Rect;
import android.graphics.SurfaceTexture;
import android.media.IAudioService;
import android.os.Handler;
import android.os.IBinder;
import android.os.Looper;
import android.os.Message;
import android.os.RemoteException;
import android.os.ServiceManager;
import android.renderscript.Allocation;
import android.renderscript.Element;
import android.renderscript.RSIllegalArgumentException;
import android.renderscript.RenderScript;
import android.renderscript.Type;
import android.text.TextUtils;
import android.util.Log;
import android.view.Surface;
import android.view.SurfaceHolder;
import java.io.IOException;
import java.lang.ref.WeakReference;
import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
/**
* The Camera class is used to set image capture settings, start/stop preview,
* snap pictures, and retrieve frames for encoding for video. This class is a
* client for the Camera service, which manages the actual camera hardware.
*
* To access the device camera, you must declare the
* {@link android.Manifest.permission#CAMERA} permission in your Android
* Manifest. Also be sure to include the
* <uses-feature>
* manifest element to declare camera features used by your application.
* For example, if you use the camera and auto-focus feature, your Manifest
* should include the following:
* <uses-permission android:name="android.permission.CAMERA" />
* <uses-feature android:name="android.hardware.camera" />
* <uses-feature android:name="android.hardware.camera.autofocus" />
*
* To take pictures with this class, use the following steps:
*
*
* - Obtain an instance of Camera from {@link #open(int)}.
*
*
- Get existing (default) settings with {@link #getParameters()}.
*
*
- If necessary, modify the returned {@link Camera.Parameters} object and call
* {@link #setParameters(Camera.Parameters)}.
*
*
- Call {@link #setDisplayOrientation(int)} to ensure correct orientation of preview.
*
*
- Important: Pass a fully initialized {@link SurfaceHolder} to
* {@link #setPreviewDisplay(SurfaceHolder)}. Without a surface, the camera
* will be unable to start the preview.
*
*
- Important: Call {@link #startPreview()} to start updating the
* preview surface. Preview must be started before you can take a picture.
*
*
- When you want, call {@link #takePicture(Camera.ShutterCallback,
* Camera.PictureCallback, Camera.PictureCallback, Camera.PictureCallback)} to
* capture a photo. Wait for the callbacks to provide the actual image data.
*
*
- After taking a picture, preview display will have stopped. To take more
* photos, call {@link #startPreview()} again first.
*
*
- Call {@link #stopPreview()} to stop updating the preview surface.
*
*
- Important: Call {@link #release()} to release the camera for
* use by other applications. Applications should release the camera
* immediately in {@link android.app.Activity#onPause()} (and re-{@link #open()}
* it in {@link android.app.Activity#onResume()}).
*
*
* To quickly switch to video recording mode, use these steps:
*
*
* - Obtain and initialize a Camera and start preview as described above.
*
*
- Call {@link #unlock()} to allow the media process to access the camera.
*
*
- Pass the camera to {@link android.media.MediaRecorder#setCamera(Camera)}.
* See {@link android.media.MediaRecorder} information about video recording.
*
*
- When finished recording, call {@link #reconnect()} to re-acquire
* and re-lock the camera.
*
*
- If desired, restart preview and take more photos or videos.
*
*
- Call {@link #stopPreview()} and {@link #release()} as described above.
*
*
* This class is not thread-safe, and is meant for use from one event thread.
* Most long-running operations (preview, focus, photo capture, etc) happen
* asynchronously and invoke callbacks as necessary. Callbacks will be invoked
* on the event thread {@link #open(int)} was called from. This class's methods
* must never be called from multiple threads at once.
*
* Caution: Different Android-powered devices
* may have different hardware specifications, such as megapixel ratings and
* auto-focus capabilities. In order for your application to be compatible with
* more devices, you should not make assumptions about the device camera
* specifications.
*
*
* Developer Guides
* For more information about using cameras, read the
* Camera developer guide.
*
*
* @deprecated We recommend using the new {@link android.hardware.camera2} API for new
* applications.
*/
@Deprecated
public class Camera {
private static final String TAG = "Camera";
// These match the enums in frameworks/base/include/camera/Camera.h
private static final int CAMERA_MSG_ERROR = 0x001;
private static final int CAMERA_MSG_SHUTTER = 0x002;
private static final int CAMERA_MSG_FOCUS = 0x004;
private static final int CAMERA_MSG_ZOOM = 0x008;
private static final int CAMERA_MSG_PREVIEW_FRAME = 0x010;
private static final int CAMERA_MSG_VIDEO_FRAME = 0x020;
private static final int CAMERA_MSG_POSTVIEW_FRAME = 0x040;
private static final int CAMERA_MSG_RAW_IMAGE = 0x080;
private static final int CAMERA_MSG_COMPRESSED_IMAGE = 0x100;
private static final int CAMERA_MSG_RAW_IMAGE_NOTIFY = 0x200;
private static final int CAMERA_MSG_PREVIEW_METADATA = 0x400;
private static final int CAMERA_MSG_FOCUS_MOVE = 0x800;
private long mNativeContext; // accessed by native methods
private EventHandler mEventHandler;
private ShutterCallback mShutterCallback;
private PictureCallback mRawImageCallback;
private PictureCallback mJpegCallback;
private PreviewCallback mPreviewCallback;
private boolean mUsingPreviewAllocation;
private PictureCallback mPostviewCallback;
private AutoFocusCallback mAutoFocusCallback;
private AutoFocusMoveCallback mAutoFocusMoveCallback;
private OnZoomChangeListener mZoomListener;
private FaceDetectionListener mFaceListener;
private ErrorCallback mErrorCallback;
private boolean mOneShot;
private boolean mWithBuffer;
private boolean mFaceDetectionRunning = false;
private final Object mAutoFocusCallbackLock = new Object();
private static final int NO_ERROR = 0;
/**
* Broadcast Action: A new picture is taken by the camera, and the entry of
* the picture has been added to the media store.
* {@link android.content.Intent#getData} is URI of the picture.
*
* In {@link android.os.Build.VERSION_CODES#N Android N} this broadcast was removed, and
* applications are recommended to use
* {@link android.app.job.JobInfo.Builder JobInfo.Builder}.{@link android.app.job.JobInfo.Builder#addTriggerContentUri}
* instead.
*
* In {@link android.os.Build.VERSION_CODES#O Android O} this broadcast has been brought
* back, but only for registered receivers. Apps that are actively running can
* again listen to the broadcast if they want an immediate clear signal about a picture
* being taken, however anything doing heavy work (or needing to be launched) as a result of
* this should still use JobScheduler.
*/
@SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION)
public static final String ACTION_NEW_PICTURE = "android.hardware.action.NEW_PICTURE";
/**
* Broadcast Action: A new video is recorded by the camera, and the entry
* of the video has been added to the media store.
* {@link android.content.Intent#getData} is URI of the video.
*
* In {@link android.os.Build.VERSION_CODES#N Android N} this broadcast was removed, and
* applications are recommended to use
* {@link android.app.job.JobInfo.Builder JobInfo.Builder}.{@link android.app.job.JobInfo.Builder#addTriggerContentUri}
* instead.
*
* In {@link android.os.Build.VERSION_CODES#O Android O} this broadcast has been brought
* back, but only for registered receivers. Apps that are actively running can
* again listen to the broadcast if they want an immediate clear signal about a video
* being taken, however anything doing heavy work (or needing to be launched) as a result of
* this should still use JobScheduler.
*/
@SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION)
public static final String ACTION_NEW_VIDEO = "android.hardware.action.NEW_VIDEO";
/**
* Camera HAL device API version 1.0
* @hide
*/
public static final int CAMERA_HAL_API_VERSION_1_0 = 0x100;
/**
* A constant meaning the normal camera connect/open will be used.
*/
private static final int CAMERA_HAL_API_VERSION_NORMAL_CONNECT = -2;
/**
* Used to indicate HAL version un-specified.
*/
private static final int CAMERA_HAL_API_VERSION_UNSPECIFIED = -1;
/**
* Hardware face detection. It does not use much CPU.
*/
private static final int CAMERA_FACE_DETECTION_HW = 0;
/**
* Software face detection. It uses some CPU.
*/
private static final int CAMERA_FACE_DETECTION_SW = 1;
/**
* Returns the number of physical cameras available on this device.
*
* @return total number of accessible camera devices, or 0 if there are no
* cameras or an error was encountered enumerating them.
*/
public native static int getNumberOfCameras();
/**
* Returns the information about a particular camera.
* If {@link #getNumberOfCameras()} returns N, the valid id is 0 to N-1.
*
* @throws RuntimeException if an invalid ID is provided, or if there is an
* error retrieving the information (generally due to a hardware or other
* low-level failure).
*/
public static void getCameraInfo(int cameraId, CameraInfo cameraInfo) {
_getCameraInfo(cameraId, cameraInfo);
IBinder b = ServiceManager.getService(Context.AUDIO_SERVICE);
IAudioService audioService = IAudioService.Stub.asInterface(b);
try {
if (audioService.isCameraSoundForced()) {
// Only set this when sound is forced; otherwise let native code
// decide.
cameraInfo.canDisableShutterSound = false;
}
} catch (RemoteException e) {
Log.e(TAG, "Audio service is unavailable for queries");
}
}
private native static void _getCameraInfo(int cameraId, CameraInfo cameraInfo);
/**
* Information about a camera
*
* @deprecated We recommend using the new {@link android.hardware.camera2} API for new
* applications.
*/
@Deprecated
public static class CameraInfo {
/**
* The facing of the camera is opposite to that of the screen.
*/
public static final int CAMERA_FACING_BACK = 0;
/**
* The facing of the camera is the same as that of the screen.
*/
public static final int CAMERA_FACING_FRONT = 1;
/**
* The direction that the camera faces. It should be
* CAMERA_FACING_BACK or CAMERA_FACING_FRONT.
*/
public int facing;
/**
* The orientation of the camera image. The value is the angle that the
* camera image needs to be rotated clockwise so it shows correctly on
* the display in its natural orientation. It should be 0, 90, 180, or 270.
*
* For example, suppose a device has a naturally tall screen. The
* back-facing camera sensor is mounted in landscape. You are looking at
* the screen. If the top side of the camera sensor is aligned with the
* right edge of the screen in natural orientation, the value should be
* 90. If the top side of a front-facing camera sensor is aligned with
* the right of the screen, the value should be 270.
*
* @see #setDisplayOrientation(int)
* @see Parameters#setRotation(int)
* @see Parameters#setPreviewSize(int, int)
* @see Parameters#setPictureSize(int, int)
* @see Parameters#setJpegThumbnailSize(int, int)
*/
public int orientation;
/**
* Whether the shutter sound can be disabled.
*
* On some devices, the camera shutter sound cannot be turned off
* through {@link #enableShutterSound enableShutterSound}. This field
* can be used to determine whether a call to disable the shutter sound
* will succeed.
*
* If this field is set to true, then a call of
* {@code enableShutterSound(false)} will be successful. If set to
* false, then that call will fail, and the shutter sound will be played
* when {@link Camera#takePicture takePicture} is called.
*/
public boolean canDisableShutterSound;
};
/**
* Creates a new Camera object to access a particular hardware camera. If
* the same camera is opened by other applications, this will throw a
* RuntimeException.
*
* You must call {@link #release()} when you are done using the camera,
* otherwise it will remain locked and be unavailable to other applications.
*
*
Your application should only have one Camera object active at a time
* for a particular hardware camera.
*
*
Callbacks from other methods are delivered to the event loop of the
* thread which called open(). If this thread has no event loop, then
* callbacks are delivered to the main application event loop. If there
* is no main application event loop, callbacks are not delivered.
*
*
Caution: On some devices, this method may
* take a long time to complete. It is best to call this method from a
* worker thread (possibly using {@link android.os.AsyncTask}) to avoid
* blocking the main application UI thread.
*
* @param cameraId the hardware camera to access, between 0 and
* {@link #getNumberOfCameras()}-1.
* @return a new Camera object, connected, locked and ready for use.
* @throws RuntimeException if opening the camera fails (for example, if the
* camera is in use by another process or device policy manager has
* disabled the camera).
* @see android.app.admin.DevicePolicyManager#getCameraDisabled(android.content.ComponentName)
*/
public static Camera open(int cameraId) {
return new Camera(cameraId);
}
/**
* Creates a new Camera object to access the first back-facing camera on the
* device. If the device does not have a back-facing camera, this returns
* null. Otherwise acts like the {@link #open(int)} call.
*
* @return a new Camera object for the first back-facing camera, or null if there is no
* backfacing camera
* @see #open(int)
*/
public static Camera open() {
int numberOfCameras = getNumberOfCameras();
CameraInfo cameraInfo = new CameraInfo();
for (int i = 0; i < numberOfCameras; i++) {
getCameraInfo(i, cameraInfo);
if (cameraInfo.facing == CameraInfo.CAMERA_FACING_BACK) {
return new Camera(i);
}
}
return null;
}
/**
* Creates a new Camera object to access a particular hardware camera with
* given hal API version. If the same camera is opened by other applications
* or the hal API version is not supported by this device, this will throw a
* RuntimeException.
*
* You must call {@link #release()} when you are done using the camera,
* otherwise it will remain locked and be unavailable to other applications.
*
* Your application should only have one Camera object active at a time for
* a particular hardware camera.
*
* Callbacks from other methods are delivered to the event loop of the
* thread which called open(). If this thread has no event loop, then
* callbacks are delivered to the main application event loop. If there is
* no main application event loop, callbacks are not delivered.
*
* Caution: On some devices, this method may take a long time to
* complete. It is best to call this method from a worker thread (possibly
* using {@link android.os.AsyncTask}) to avoid blocking the main
* application UI thread.
*
* @param cameraId The hardware camera to access, between 0 and
* {@link #getNumberOfCameras()}-1.
* @param halVersion The HAL API version this camera device to be opened as.
* @return a new Camera object, connected, locked and ready for use.
*
* @throws IllegalArgumentException if the {@code halVersion} is invalid
*
* @throws RuntimeException if opening the camera fails (for example, if the
* camera is in use by another process or device policy manager has disabled
* the camera).
*
* @see android.app.admin.DevicePolicyManager#getCameraDisabled(android.content.ComponentName)
* @see #CAMERA_HAL_API_VERSION_1_0
*
* @hide
*/
public static Camera openLegacy(int cameraId, int halVersion) {
if (halVersion < CAMERA_HAL_API_VERSION_1_0) {
throw new IllegalArgumentException("Invalid HAL version " + halVersion);
}
return new Camera(cameraId, halVersion);
}
/**
* Create a legacy camera object.
*
* @param cameraId The hardware camera to access, between 0 and
* {@link #getNumberOfCameras()}-1.
* @param halVersion The HAL API version this camera device to be opened as.
*/
private Camera(int cameraId, int halVersion) {
int err = cameraInitVersion(cameraId, halVersion);
if (checkInitErrors(err)) {
if (err == -EACCES) {
throw new RuntimeException("Fail to connect to camera service");
} else if (err == -ENODEV) {
throw new RuntimeException("Camera initialization failed");
} else if (err == -ENOSYS) {
throw new RuntimeException("Camera initialization failed because some methods"
+ " are not implemented");
} else if (err == -EOPNOTSUPP) {
throw new RuntimeException("Camera initialization failed because the hal"
+ " version is not supported by this device");
} else if (err == -EINVAL) {
throw new RuntimeException("Camera initialization failed because the input"
+ " arugments are invalid");
} else if (err == -EBUSY) {
throw new RuntimeException("Camera initialization failed because the camera"
+ " device was already opened");
} else if (err == -EUSERS) {
throw new RuntimeException("Camera initialization failed because the max"
+ " number of camera devices were already opened");
}
// Should never hit this.
throw new RuntimeException("Unknown camera error");
}
}
private int cameraInitVersion(int cameraId, int halVersion) {
mShutterCallback = null;
mRawImageCallback = null;
mJpegCallback = null;
mPreviewCallback = null;
mPostviewCallback = null;
mUsingPreviewAllocation = false;
mZoomListener = null;
Looper looper;
if ((looper = Looper.myLooper()) != null) {
mEventHandler = new EventHandler(this, looper);
} else if ((looper = Looper.getMainLooper()) != null) {
mEventHandler = new EventHandler(this, looper);
} else {
mEventHandler = null;
}
return native_setup(new WeakReference(this), cameraId, halVersion,
ActivityThread.currentOpPackageName());
}
private int cameraInitNormal(int cameraId) {
return cameraInitVersion(cameraId, CAMERA_HAL_API_VERSION_NORMAL_CONNECT);
}
/**
* Connect to the camera service using #connectLegacy
*
*
* This acts the same as normal except that it will return
* the detailed error code if open fails instead of
* converting everything into {@code NO_INIT}.
*
* Intended to use by the camera2 shim only, do not use this for other code.
*
* @return a detailed errno error code, or {@code NO_ERROR} on success
*
* @hide
*/
public int cameraInitUnspecified(int cameraId) {
return cameraInitVersion(cameraId, CAMERA_HAL_API_VERSION_UNSPECIFIED);
}
/** used by Camera#open, Camera#open(int) */
Camera(int cameraId) {
int err = cameraInitNormal(cameraId);
if (checkInitErrors(err)) {
if (err == -EACCES) {
throw new RuntimeException("Fail to connect to camera service");
} else if (err == -ENODEV) {
throw new RuntimeException("Camera initialization failed");
}
// Should never hit this.
throw new RuntimeException("Unknown camera error");
}
}
/**
* @hide
*/
public static boolean checkInitErrors(int err) {
return err != NO_ERROR;
}
/**
* @hide
*/
public static Camera openUninitialized() {
return new Camera();
}
/**
* An empty Camera for testing purpose.
*/
Camera() {
}
@Override
protected void finalize() {
release();
}
private native final int native_setup(Object camera_this, int cameraId, int halVersion,
String packageName);
private native final void native_release();
/**
* Disconnects and releases the Camera object resources.
*
* You must call this as soon as you're done with the Camera object.
*/
public final void release() {
native_release();
mFaceDetectionRunning = false;
}
/**
* Unlocks the camera to allow another process to access it.
* Normally, the camera is locked to the process with an active Camera
* object until {@link #release()} is called. To allow rapid handoff
* between processes, you can call this method to release the camera
* temporarily for another process to use; once the other process is done
* you can call {@link #reconnect()} to reclaim the camera.
*
* This must be done before calling
* {@link android.media.MediaRecorder#setCamera(Camera)}. This cannot be
* called after recording starts.
*
*
If you are not recording video, you probably do not need this method.
*
* @throws RuntimeException if the camera cannot be unlocked.
*/
public native final void unlock();
/**
* Re-locks the camera to prevent other processes from accessing it.
* Camera objects are locked by default unless {@link #unlock()} is
* called. Normally {@link #reconnect()} is used instead.
*
* Since API level 14, camera is automatically locked for applications in
* {@link android.media.MediaRecorder#start()}. Applications can use the
* camera (ex: zoom) after recording starts. There is no need to call this
* after recording starts or stops.
*
*
If you are not recording video, you probably do not need this method.
*
* @throws RuntimeException if the camera cannot be re-locked (for
* example, if the camera is still in use by another process).
*/
public native final void lock();
/**
* Reconnects to the camera service after another process used it.
* After {@link #unlock()} is called, another process may use the
* camera; when the process is done, you must reconnect to the camera,
* which will re-acquire the lock and allow you to continue using the
* camera.
*
* Since API level 14, camera is automatically locked for applications in
* {@link android.media.MediaRecorder#start()}. Applications can use the
* camera (ex: zoom) after recording starts. There is no need to call this
* after recording starts or stops.
*
*
If you are not recording video, you probably do not need this method.
*
* @throws IOException if a connection cannot be re-established (for
* example, if the camera is still in use by another process).
* @throws RuntimeException if release() has been called on this Camera
* instance.
*/
public native final void reconnect() throws IOException;
/**
* Sets the {@link Surface} to be used for live preview.
* Either a surface or surface texture is necessary for preview, and
* preview is necessary to take pictures. The same surface can be re-set
* without harm. Setting a preview surface will un-set any preview surface
* texture that was set via {@link #setPreviewTexture}.
*
* The {@link SurfaceHolder} must already contain a surface when this
* method is called. If you are using {@link android.view.SurfaceView},
* you will need to register a {@link SurfaceHolder.Callback} with
* {@link SurfaceHolder#addCallback(SurfaceHolder.Callback)} and wait for
* {@link SurfaceHolder.Callback#surfaceCreated(SurfaceHolder)} before
* calling setPreviewDisplay() or starting preview.
*
*
This method must be called before {@link #startPreview()}. The
* one exception is that if the preview surface is not set (or set to null)
* before startPreview() is called, then this method may be called once
* with a non-null parameter to set the preview surface. (This allows
* camera setup and surface creation to happen in parallel, saving time.)
* The preview surface may not otherwise change while preview is running.
*
* @param holder containing the Surface on which to place the preview,
* or null to remove the preview surface
* @throws IOException if the method fails (for example, if the surface
* is unavailable or unsuitable).
* @throws RuntimeException if release() has been called on this Camera
* instance.
*/
public final void setPreviewDisplay(SurfaceHolder holder) throws IOException {
if (holder != null) {
setPreviewSurface(holder.getSurface());
} else {
setPreviewSurface((Surface)null);
}
}
/**
* @hide
*/
public native final void setPreviewSurface(Surface surface) throws IOException;
/**
* Sets the {@link SurfaceTexture} to be used for live preview.
* Either a surface or surface texture is necessary for preview, and
* preview is necessary to take pictures. The same surface texture can be
* re-set without harm. Setting a preview surface texture will un-set any
* preview surface that was set via {@link #setPreviewDisplay}.
*
* This method must be called before {@link #startPreview()}. The
* one exception is that if the preview surface texture is not set (or set
* to null) before startPreview() is called, then this method may be called
* once with a non-null parameter to set the preview surface. (This allows
* camera setup and surface creation to happen in parallel, saving time.)
* The preview surface texture may not otherwise change while preview is
* running.
*
*
The timestamps provided by {@link SurfaceTexture#getTimestamp()} for a
* SurfaceTexture set as the preview texture have an unspecified zero point,
* and cannot be directly compared between different cameras or different
* instances of the same camera, or across multiple runs of the same
* program.
*
*
If you are using the preview data to create video or still images,
* strongly consider using {@link android.media.MediaActionSound} to
* properly indicate image capture or recording start/stop to the user.
*
* @see android.media.MediaActionSound
* @see android.graphics.SurfaceTexture
* @see android.view.TextureView
* @param surfaceTexture the {@link SurfaceTexture} to which the preview
* images are to be sent or null to remove the current preview surface
* texture
* @throws IOException if the method fails (for example, if the surface
* texture is unavailable or unsuitable).
* @throws RuntimeException if release() has been called on this Camera
* instance.
*/
public native final void setPreviewTexture(SurfaceTexture surfaceTexture) throws IOException;
/**
* Callback interface used to deliver copies of preview frames as
* they are displayed.
*
* @see #setPreviewCallback(Camera.PreviewCallback)
* @see #setOneShotPreviewCallback(Camera.PreviewCallback)
* @see #setPreviewCallbackWithBuffer(Camera.PreviewCallback)
* @see #startPreview()
*
* @deprecated We recommend using the new {@link android.hardware.camera2} API for new
* applications.
*/
@Deprecated
public interface PreviewCallback
{
/**
* Called as preview frames are displayed. This callback is invoked
* on the event thread {@link #open(int)} was called from.
*
* If using the {@link android.graphics.ImageFormat#YV12} format,
* refer to the equations in {@link Camera.Parameters#setPreviewFormat}
* for the arrangement of the pixel data in the preview callback
* buffers.
*
* @param data the contents of the preview frame in the format defined
* by {@link android.graphics.ImageFormat}, which can be queried
* with {@link android.hardware.Camera.Parameters#getPreviewFormat()}.
* If {@link android.hardware.Camera.Parameters#setPreviewFormat(int)}
* is never called, the default will be the YCbCr_420_SP
* (NV21) format.
* @param camera the Camera service object.
*/
void onPreviewFrame(byte[] data, Camera camera);
};
/**
* Starts capturing and drawing preview frames to the screen.
* Preview will not actually start until a surface is supplied
* with {@link #setPreviewDisplay(SurfaceHolder)} or
* {@link #setPreviewTexture(SurfaceTexture)}.
*
* If {@link #setPreviewCallback(Camera.PreviewCallback)},
* {@link #setOneShotPreviewCallback(Camera.PreviewCallback)}, or
* {@link #setPreviewCallbackWithBuffer(Camera.PreviewCallback)} were
* called, {@link Camera.PreviewCallback#onPreviewFrame(byte[], Camera)}
* will be called when preview data becomes available.
*
* @throws RuntimeException if starting preview fails; usually this would be
* because of a hardware or other low-level error, or because release()
* has been called on this Camera instance.
*/
public native final void startPreview();
/**
* Stops capturing and drawing preview frames to the surface, and
* resets the camera for a future call to {@link #startPreview()}.
*
* @throws RuntimeException if stopping preview fails; usually this would be
* because of a hardware or other low-level error, or because release()
* has been called on this Camera instance.
*/
public final void stopPreview() {
_stopPreview();
mFaceDetectionRunning = false;
mShutterCallback = null;
mRawImageCallback = null;
mPostviewCallback = null;
mJpegCallback = null;
synchronized (mAutoFocusCallbackLock) {
mAutoFocusCallback = null;
}
mAutoFocusMoveCallback = null;
}
private native final void _stopPreview();
/**
* Return current preview state.
*
* FIXME: Unhide before release
* @hide
*/
public native final boolean previewEnabled();
/**
* Installs a callback to be invoked for every preview frame in addition
* to displaying them on the screen. The callback will be repeatedly called
* for as long as preview is active. This method can be called at any time,
* even while preview is live. Any other preview callbacks are
* overridden.
*
* If you are using the preview data to create video or still images,
* strongly consider using {@link android.media.MediaActionSound} to
* properly indicate image capture or recording start/stop to the user.
*
* @param cb a callback object that receives a copy of each preview frame,
* or null to stop receiving callbacks.
* @throws RuntimeException if release() has been called on this Camera
* instance.
* @see android.media.MediaActionSound
*/
public final void setPreviewCallback(PreviewCallback cb) {
mPreviewCallback = cb;
mOneShot = false;
mWithBuffer = false;
if (cb != null) {
mUsingPreviewAllocation = false;
}
// Always use one-shot mode. We fake camera preview mode by
// doing one-shot preview continuously.
setHasPreviewCallback(cb != null, false);
}
/**
* Installs a callback to be invoked for the next preview frame in
* addition to displaying it on the screen. After one invocation, the
* callback is cleared. This method can be called any time, even when
* preview is live. Any other preview callbacks are overridden.
*
* If you are using the preview data to create video or still images,
* strongly consider using {@link android.media.MediaActionSound} to
* properly indicate image capture or recording start/stop to the user.
*
* @param cb a callback object that receives a copy of the next preview frame,
* or null to stop receiving callbacks.
* @throws RuntimeException if release() has been called on this Camera
* instance.
* @see android.media.MediaActionSound
*/
public final void setOneShotPreviewCallback(PreviewCallback cb) {
mPreviewCallback = cb;
mOneShot = true;
mWithBuffer = false;
if (cb != null) {
mUsingPreviewAllocation = false;
}
setHasPreviewCallback(cb != null, false);
}
private native final void setHasPreviewCallback(boolean installed, boolean manualBuffer);
/**
* Installs a callback to be invoked for every preview frame, using
* buffers supplied with {@link #addCallbackBuffer(byte[])}, in addition to
* displaying them on the screen. The callback will be repeatedly called
* for as long as preview is active and buffers are available. Any other
* preview callbacks are overridden.
*
* The purpose of this method is to improve preview efficiency and frame
* rate by allowing preview frame memory reuse. You must call
* {@link #addCallbackBuffer(byte[])} at some point -- before or after
* calling this method -- or no callbacks will received.
*
* The buffer queue will be cleared if this method is called with a null
* callback, {@link #setPreviewCallback(Camera.PreviewCallback)} is called,
* or {@link #setOneShotPreviewCallback(Camera.PreviewCallback)} is
* called.
*
* If you are using the preview data to create video or still images,
* strongly consider using {@link android.media.MediaActionSound} to
* properly indicate image capture or recording start/stop to the user.
*
* @param cb a callback object that receives a copy of the preview frame,
* or null to stop receiving callbacks and clear the buffer queue.
* @throws RuntimeException if release() has been called on this Camera
* instance.
* @see #addCallbackBuffer(byte[])
* @see android.media.MediaActionSound
*/
public final void setPreviewCallbackWithBuffer(PreviewCallback cb) {
mPreviewCallback = cb;
mOneShot = false;
mWithBuffer = true;
if (cb != null) {
mUsingPreviewAllocation = false;
}
setHasPreviewCallback(cb != null, true);
}
/**
* Adds a pre-allocated buffer to the preview callback buffer queue.
* Applications can add one or more buffers to the queue. When a preview
* frame arrives and there is still at least one available buffer, the
* buffer will be used and removed from the queue. Then preview callback is
* invoked with the buffer. If a frame arrives and there is no buffer left,
* the frame is discarded. Applications should add buffers back when they
* finish processing the data in them.
*
* For formats besides YV12, the size of the buffer is determined by
* multiplying the preview image width, height, and bytes per pixel. The
* width and height can be read from
* {@link Camera.Parameters#getPreviewSize()}. Bytes per pixel can be
* computed from {@link android.graphics.ImageFormat#getBitsPerPixel(int)} /
* 8, using the image format from
* {@link Camera.Parameters#getPreviewFormat()}.
*
*
If using the {@link android.graphics.ImageFormat#YV12} format, the
* size can be calculated using the equations listed in
* {@link Camera.Parameters#setPreviewFormat}.
*
*
This method is only necessary when
* {@link #setPreviewCallbackWithBuffer(PreviewCallback)} is used. When
* {@link #setPreviewCallback(PreviewCallback)} or
* {@link #setOneShotPreviewCallback(PreviewCallback)} are used, buffers
* are automatically allocated. When a supplied buffer is too small to
* hold the preview frame data, preview callback will return null and
* the buffer will be removed from the buffer queue.
*
* @param callbackBuffer the buffer to add to the queue. The size of the
* buffer must match the values described above.
* @see #setPreviewCallbackWithBuffer(PreviewCallback)
*/
public final void addCallbackBuffer(byte[] callbackBuffer)
{
_addCallbackBuffer(callbackBuffer, CAMERA_MSG_PREVIEW_FRAME);
}
/**
* Adds a pre-allocated buffer to the raw image callback buffer queue.
* Applications can add one or more buffers to the queue. When a raw image
* frame arrives and there is still at least one available buffer, the
* buffer will be used to hold the raw image data and removed from the
* queue. Then raw image callback is invoked with the buffer. If a raw
* image frame arrives but there is no buffer left, the frame is
* discarded. Applications should add buffers back when they finish
* processing the data in them by calling this method again in order
* to avoid running out of raw image callback buffers.
*
* The size of the buffer is determined by multiplying the raw image
* width, height, and bytes per pixel. The width and height can be
* read from {@link Camera.Parameters#getPictureSize()}. Bytes per pixel
* can be computed from
* {@link android.graphics.ImageFormat#getBitsPerPixel(int)} / 8,
* using the image format from {@link Camera.Parameters#getPreviewFormat()}.
*
*
This method is only necessary when the PictureCallbck for raw image
* is used while calling {@link #takePicture(Camera.ShutterCallback,
* Camera.PictureCallback, Camera.PictureCallback, Camera.PictureCallback)}.
*
*
Please note that by calling this method, the mode for
* application-managed callback buffers is triggered. If this method has
* never been called, null will be returned by the raw image callback since
* there is no image callback buffer available. Furthermore, When a supplied
* buffer is too small to hold the raw image data, raw image callback will
* return null and the buffer will be removed from the buffer queue.
*
* @param callbackBuffer the buffer to add to the raw image callback buffer
* queue. The size should be width * height * (bits per pixel) / 8. An
* null callbackBuffer will be ignored and won't be added to the queue.
*
* @see #takePicture(Camera.ShutterCallback,
* Camera.PictureCallback, Camera.PictureCallback, Camera.PictureCallback)}.
*
* {@hide}
*/
public final void addRawImageCallbackBuffer(byte[] callbackBuffer)
{
addCallbackBuffer(callbackBuffer, CAMERA_MSG_RAW_IMAGE);
}
private final void addCallbackBuffer(byte[] callbackBuffer, int msgType)
{
// CAMERA_MSG_VIDEO_FRAME may be allowed in the future.
if (msgType != CAMERA_MSG_PREVIEW_FRAME &&
msgType != CAMERA_MSG_RAW_IMAGE) {
throw new IllegalArgumentException(
"Unsupported message type: " + msgType);
}
_addCallbackBuffer(callbackBuffer, msgType);
}
private native final void _addCallbackBuffer(
byte[] callbackBuffer, int msgType);
/**
* Create a {@link android.renderscript RenderScript}
* {@link android.renderscript.Allocation Allocation} to use as a
* destination of preview callback frames. Use
* {@link #setPreviewCallbackAllocation setPreviewCallbackAllocation} to use
* the created Allocation as a destination for camera preview frames.
*
* The Allocation will be created with a YUV type, and its contents must
* be accessed within Renderscript with the {@code rsGetElementAtYuv_*}
* accessor methods. Its size will be based on the current
* {@link Parameters#getPreviewSize preview size} configured for this
* camera.
*
* @param rs the RenderScript context for this Allocation.
* @param usage additional usage flags to set for the Allocation. The usage
* flag {@link android.renderscript.Allocation#USAGE_IO_INPUT} will always
* be set on the created Allocation, but additional flags may be provided
* here.
* @return a new YUV-type Allocation with dimensions equal to the current
* preview size.
* @throws RSIllegalArgumentException if the usage flags are not compatible
* with an YUV Allocation.
* @see #setPreviewCallbackAllocation
* @hide
*/
public final Allocation createPreviewAllocation(RenderScript rs, int usage)
throws RSIllegalArgumentException {
Parameters p = getParameters();
Size previewSize = p.getPreviewSize();
Type.Builder yuvBuilder = new Type.Builder(rs,
Element.createPixel(rs,
Element.DataType.UNSIGNED_8,
Element.DataKind.PIXEL_YUV));
// Use YV12 for wide compatibility. Changing this requires also
// adjusting camera service's format selection.
yuvBuilder.setYuvFormat(ImageFormat.YV12);
yuvBuilder.setX(previewSize.width);
yuvBuilder.setY(previewSize.height);
Allocation a = Allocation.createTyped(rs, yuvBuilder.create(),
usage | Allocation.USAGE_IO_INPUT);
return a;
}
/**
* Set an {@link android.renderscript.Allocation Allocation} as the
* target of preview callback data. Use this method for efficient processing
* of camera preview data with RenderScript. The Allocation must be created
* with the {@link #createPreviewAllocation createPreviewAllocation }
* method.
*
* Setting a preview allocation will disable any active preview callbacks
* set by {@link #setPreviewCallback setPreviewCallback} or
* {@link #setPreviewCallbackWithBuffer setPreviewCallbackWithBuffer}, and
* vice versa. Using a preview allocation still requires an active standard
* preview target to be set, either with
* {@link #setPreviewTexture setPreviewTexture} or
* {@link #setPreviewDisplay setPreviewDisplay}.
*
* To be notified when new frames are available to the Allocation, use
* {@link android.renderscript.Allocation#setIoInputNotificationHandler Allocation.setIoInputNotificationHandler}. To
* update the frame currently accessible from the Allocation to the latest
* preview frame, call
* {@link android.renderscript.Allocation#ioReceive Allocation.ioReceive}.
*
* To disable preview into the Allocation, call this method with a
* {@code null} parameter.
*
* Once a preview allocation is set, the preview size set by
* {@link Parameters#setPreviewSize setPreviewSize} cannot be changed. If
* you wish to change the preview size, first remove the preview allocation
* by calling {@code setPreviewCallbackAllocation(null)}, then change the
* preview size, create a new preview Allocation with
* {@link #createPreviewAllocation createPreviewAllocation}, and set it as
* the new preview callback allocation target.
*
* If you are using the preview data to create video or still images,
* strongly consider using {@link android.media.MediaActionSound} to
* properly indicate image capture or recording start/stop to the user.
*
* @param previewAllocation the allocation to use as destination for preview
* @throws IOException if configuring the camera to use the Allocation for
* preview fails.
* @throws IllegalArgumentException if the Allocation's dimensions or other
* parameters don't meet the requirements.
* @see #createPreviewAllocation
* @see #setPreviewCallback
* @see #setPreviewCallbackWithBuffer
* @hide
*/
public final void setPreviewCallbackAllocation(Allocation previewAllocation)
throws IOException {
Surface previewSurface = null;
if (previewAllocation != null) {
Parameters p = getParameters();
Size previewSize = p.getPreviewSize();
if (previewSize.width != previewAllocation.getType().getX() ||
previewSize.height != previewAllocation.getType().getY()) {
throw new IllegalArgumentException(
"Allocation dimensions don't match preview dimensions: " +
"Allocation is " +
previewAllocation.getType().getX() +
", " +
previewAllocation.getType().getY() +
". Preview is " + previewSize.width + ", " +
previewSize.height);
}
if ((previewAllocation.getUsage() &
Allocation.USAGE_IO_INPUT) == 0) {
throw new IllegalArgumentException(
"Allocation usage does not include USAGE_IO_INPUT");
}
if (previewAllocation.getType().getElement().getDataKind() !=
Element.DataKind.PIXEL_YUV) {
throw new IllegalArgumentException(
"Allocation is not of a YUV type");
}
previewSurface = previewAllocation.getSurface();
mUsingPreviewAllocation = true;
} else {
mUsingPreviewAllocation = false;
}
setPreviewCallbackSurface(previewSurface);
}
private native final void setPreviewCallbackSurface(Surface s);
private class EventHandler extends Handler
{
private final Camera mCamera;
public EventHandler(Camera c, Looper looper) {
super(looper);
mCamera = c;
}
@Override
public void handleMessage(Message msg) {
switch(msg.what) {
case CAMERA_MSG_SHUTTER:
if (mShutterCallback != null) {
mShutterCallback.onShutter();
}
return;
case CAMERA_MSG_RAW_IMAGE:
if (mRawImageCallback != null) {
mRawImageCallback.onPictureTaken((byte[])msg.obj, mCamera);
}
return;
case CAMERA_MSG_COMPRESSED_IMAGE:
if (mJpegCallback != null) {
mJpegCallback.onPictureTaken((byte[])msg.obj, mCamera);
}
return;
case CAMERA_MSG_PREVIEW_FRAME:
PreviewCallback pCb = mPreviewCallback;
if (pCb != null) {
if (mOneShot) {
// Clear the callback variable before the callback
// in case the app calls setPreviewCallback from
// the callback function
mPreviewCallback = null;
} else if (!mWithBuffer) {
// We're faking the camera preview mode to prevent
// the app from being flooded with preview frames.
// Set to oneshot mode again.
setHasPreviewCallback(true, false);
}
pCb.onPreviewFrame((byte[])msg.obj, mCamera);
}
return;
case CAMERA_MSG_POSTVIEW_FRAME:
if (mPostviewCallback != null) {
mPostviewCallback.onPictureTaken((byte[])msg.obj, mCamera);
}
return;
case CAMERA_MSG_FOCUS:
AutoFocusCallback cb = null;
synchronized (mAutoFocusCallbackLock) {
cb = mAutoFocusCallback;
}
if (cb != null) {
boolean success = msg.arg1 == 0 ? false : true;
cb.onAutoFocus(success, mCamera);
}
return;
case CAMERA_MSG_ZOOM:
if (mZoomListener != null) {
mZoomListener.onZoomChange(msg.arg1, msg.arg2 != 0, mCamera);
}
return;
case CAMERA_MSG_PREVIEW_METADATA:
if (mFaceListener != null) {
mFaceListener.onFaceDetection((Face[])msg.obj, mCamera);
}
return;
case CAMERA_MSG_ERROR :
Log.e(TAG, "Error " + msg.arg1);
if (mErrorCallback != null) {
mErrorCallback.onError(msg.arg1, mCamera);
}
return;
case CAMERA_MSG_FOCUS_MOVE:
if (mAutoFocusMoveCallback != null) {
mAutoFocusMoveCallback.onAutoFocusMoving(msg.arg1 == 0 ? false : true, mCamera);
}
return;
default:
Log.e(TAG, "Unknown message type " + msg.what);
return;
}
}
}
private static void postEventFromNative(Object camera_ref,
int what, int arg1, int arg2, Object obj)
{
Camera c = (Camera)((WeakReference)camera_ref).get();
if (c == null)
return;
if (c.mEventHandler != null) {
Message m = c.mEventHandler.obtainMessage(what, arg1, arg2, obj);
c.mEventHandler.sendMessage(m);
}
}
/**
* Callback interface used to notify on completion of camera auto focus.
*
* Devices that do not support auto-focus will receive a "fake"
* callback to this interface. If your application needs auto-focus and
* should not be installed on devices without auto-focus, you must
* declare that your app uses the
* {@code android.hardware.camera.autofocus} feature, in the
* <uses-feature>
* manifest element.
*
* @see #autoFocus(AutoFocusCallback)
* @deprecated We recommend using the new {@link android.hardware.camera2} API for new
* applications.
*/
@Deprecated
public interface AutoFocusCallback
{
/**
* Called when the camera auto focus completes. If the camera
* does not support auto-focus and autoFocus is called,
* onAutoFocus will be called immediately with a fake value of
* success set to true.
*
* The auto-focus routine does not lock auto-exposure and auto-white
* balance after it completes.
*
* @param success true if focus was successful, false if otherwise
* @param camera the Camera service object
* @see android.hardware.Camera.Parameters#setAutoExposureLock(boolean)
* @see android.hardware.Camera.Parameters#setAutoWhiteBalanceLock(boolean)
*/
void onAutoFocus(boolean success, Camera camera);
}
/**
* Starts camera auto-focus and registers a callback function to run when
* the camera is focused. This method is only valid when preview is active
* (between {@link #startPreview()} and before {@link #stopPreview()}).
*
* Callers should check
* {@link android.hardware.Camera.Parameters#getFocusMode()} to determine if
* this method should be called. If the camera does not support auto-focus,
* it is a no-op and {@link AutoFocusCallback#onAutoFocus(boolean, Camera)}
* callback will be called immediately.
*
*
If your application should not be installed
* on devices without auto-focus, you must declare that your application
* uses auto-focus with the
* <uses-feature>
* manifest element.
*
* If the current flash mode is not
* {@link android.hardware.Camera.Parameters#FLASH_MODE_OFF}, flash may be
* fired during auto-focus, depending on the driver and camera hardware.
*
*
Auto-exposure lock {@link android.hardware.Camera.Parameters#getAutoExposureLock()}
* and auto-white balance locks {@link android.hardware.Camera.Parameters#getAutoWhiteBalanceLock()}
* do not change during and after autofocus. But auto-focus routine may stop
* auto-exposure and auto-white balance transiently during focusing.
*
*
Stopping preview with {@link #stopPreview()}, or triggering still
* image capture with {@link #takePicture(Camera.ShutterCallback,
* Camera.PictureCallback, Camera.PictureCallback)}, will not change the
* the focus position. Applications must call cancelAutoFocus to reset the
* focus.
*
* If autofocus is successful, consider using
* {@link android.media.MediaActionSound} to properly play back an autofocus
* success sound to the user.
*
* @param cb the callback to run
* @throws RuntimeException if starting autofocus fails; usually this would
* be because of a hardware or other low-level error, or because
* release() has been called on this Camera instance.
* @see #cancelAutoFocus()
* @see android.hardware.Camera.Parameters#setAutoExposureLock(boolean)
* @see android.hardware.Camera.Parameters#setAutoWhiteBalanceLock(boolean)
* @see android.media.MediaActionSound
*/
public final void autoFocus(AutoFocusCallback cb)
{
synchronized (mAutoFocusCallbackLock) {
mAutoFocusCallback = cb;
}
native_autoFocus();
}
private native final void native_autoFocus();
/**
* Cancels any auto-focus function in progress.
* Whether or not auto-focus is currently in progress,
* this function will return the focus position to the default.
* If the camera does not support auto-focus, this is a no-op.
*
* @throws RuntimeException if canceling autofocus fails; usually this would
* be because of a hardware or other low-level error, or because
* release() has been called on this Camera instance.
* @see #autoFocus(Camera.AutoFocusCallback)
*/
public final void cancelAutoFocus()
{
synchronized (mAutoFocusCallbackLock) {
mAutoFocusCallback = null;
}
native_cancelAutoFocus();
// CAMERA_MSG_FOCUS should be removed here because the following
// scenario can happen:
// - An application uses the same thread for autoFocus, cancelAutoFocus
// and looper thread.
// - The application calls autoFocus.
// - HAL sends CAMERA_MSG_FOCUS, which enters the looper message queue.
// Before event handler's handleMessage() is invoked, the application
// calls cancelAutoFocus and autoFocus.
// - The application gets the old CAMERA_MSG_FOCUS and thinks autofocus
// has been completed. But in fact it is not.
//
// As documented in the beginning of the file, apps should not use
// multiple threads to call autoFocus and cancelAutoFocus at the same
// time. It is HAL's responsibility not to send a CAMERA_MSG_FOCUS
// message after native_cancelAutoFocus is called.
mEventHandler.removeMessages(CAMERA_MSG_FOCUS);
}
private native final void native_cancelAutoFocus();
/**
* Callback interface used to notify on auto focus start and stop.
*
* This is only supported in continuous autofocus modes -- {@link
* Parameters#FOCUS_MODE_CONTINUOUS_VIDEO} and {@link
* Parameters#FOCUS_MODE_CONTINUOUS_PICTURE}. Applications can show
* autofocus animation based on this.
*
* @deprecated We recommend using the new {@link android.hardware.camera2} API for new
* applications.
*/
@Deprecated
public interface AutoFocusMoveCallback
{
/**
* Called when the camera auto focus starts or stops.
*
* @param start true if focus starts to move, false if focus stops to move
* @param camera the Camera service object
*/
void onAutoFocusMoving(boolean start, Camera camera);
}
/**
* Sets camera auto-focus move callback.
*
* @param cb the callback to run
* @throws RuntimeException if enabling the focus move callback fails;
* usually this would be because of a hardware or other low-level error,
* or because release() has been called on this Camera instance.
*/
public void setAutoFocusMoveCallback(AutoFocusMoveCallback cb) {
mAutoFocusMoveCallback = cb;
enableFocusMoveCallback((mAutoFocusMoveCallback != null) ? 1 : 0);
}
private native void enableFocusMoveCallback(int enable);
/**
* Callback interface used to signal the moment of actual image capture.
*
* @see #takePicture(ShutterCallback, PictureCallback, PictureCallback, PictureCallback)
*
* @deprecated We recommend using the new {@link android.hardware.camera2} API for new
* applications.
*/
@Deprecated
public interface ShutterCallback
{
/**
* Called as near as possible to the moment when a photo is captured
* from the sensor. This is a good opportunity to play a shutter sound
* or give other feedback of camera operation. This may be some time
* after the photo was triggered, but some time before the actual data
* is available.
*/
void onShutter();
}
/**
* Callback interface used to supply image data from a photo capture.
*
* @see #takePicture(ShutterCallback, PictureCallback, PictureCallback, PictureCallback)
*
* @deprecated We recommend using the new {@link android.hardware.camera2} API for new
* applications.
*/
@Deprecated
public interface PictureCallback {
/**
* Called when image data is available after a picture is taken.
* The format of the data depends on the context of the callback
* and {@link Camera.Parameters} settings.
*
* @param data a byte array of the picture data
* @param camera the Camera service object
*/
void onPictureTaken(byte[] data, Camera camera);
};
/**
* Equivalent to takePicture(Shutter, raw, null, jpeg)
.
*
* @see #takePicture(ShutterCallback, PictureCallback, PictureCallback, PictureCallback)
*/
public final void takePicture(ShutterCallback shutter, PictureCallback raw,
PictureCallback jpeg) {
takePicture(shutter, raw, null, jpeg);
}
private native final void native_takePicture(int msgType);
/**
* Triggers an asynchronous image capture. The camera service will initiate
* a series of callbacks to the application as the image capture progresses.
* The shutter callback occurs after the image is captured. This can be used
* to trigger a sound to let the user know that image has been captured. The
* raw callback occurs when the raw image data is available (NOTE: the data
* will be null if there is no raw image callback buffer available or the
* raw image callback buffer is not large enough to hold the raw image).
* The postview callback occurs when a scaled, fully processed postview
* image is available (NOTE: not all hardware supports this). The jpeg
* callback occurs when the compressed image is available. If the
* application does not need a particular callback, a null can be passed
* instead of a callback method.
*
* This method is only valid when preview is active (after
* {@link #startPreview()}). Preview will be stopped after the image is
* taken; callers must call {@link #startPreview()} again if they want to
* re-start preview or take more pictures. This should not be called between
* {@link android.media.MediaRecorder#start()} and
* {@link android.media.MediaRecorder#stop()}.
*
*
After calling this method, you must not call {@link #startPreview()}
* or take another picture until the JPEG callback has returned.
*
* @param shutter the callback for image capture moment, or null
* @param raw the callback for raw (uncompressed) image data, or null
* @param postview callback with postview image data, may be null
* @param jpeg the callback for JPEG image data, or null
* @throws RuntimeException if starting picture capture fails; usually this
* would be because of a hardware or other low-level error, or because
* release() has been called on this Camera instance.
*/
public final void takePicture(ShutterCallback shutter, PictureCallback raw,
PictureCallback postview, PictureCallback jpeg) {
mShutterCallback = shutter;
mRawImageCallback = raw;
mPostviewCallback = postview;
mJpegCallback = jpeg;
// If callback is not set, do not send me callbacks.
int msgType = 0;
if (mShutterCallback != null) {
msgType |= CAMERA_MSG_SHUTTER;
}
if (mRawImageCallback != null) {
msgType |= CAMERA_MSG_RAW_IMAGE;
}
if (mPostviewCallback != null) {
msgType |= CAMERA_MSG_POSTVIEW_FRAME;
}
if (mJpegCallback != null) {
msgType |= CAMERA_MSG_COMPRESSED_IMAGE;
}
native_takePicture(msgType);
mFaceDetectionRunning = false;
}
/**
* Zooms to the requested value smoothly. The driver will notify {@link
* OnZoomChangeListener} of the zoom value and whether zoom is stopped at
* the time. For example, suppose the current zoom is 0 and startSmoothZoom
* is called with value 3. The
* {@link Camera.OnZoomChangeListener#onZoomChange(int, boolean, Camera)}
* method will be called three times with zoom values 1, 2, and 3.
* Applications can call {@link #stopSmoothZoom} to stop the zoom earlier.
* Applications should not call startSmoothZoom again or change the zoom
* value before zoom stops. If the supplied zoom value equals to the current
* zoom value, no zoom callback will be generated. This method is supported
* if {@link android.hardware.Camera.Parameters#isSmoothZoomSupported}
* returns true.
*
* @param value zoom value. The valid range is 0 to {@link
* android.hardware.Camera.Parameters#getMaxZoom}.
* @throws IllegalArgumentException if the zoom value is invalid.
* @throws RuntimeException if the method fails.
* @see #setZoomChangeListener(OnZoomChangeListener)
*/
public native final void startSmoothZoom(int value);
/**
* Stops the smooth zoom. Applications should wait for the {@link
* OnZoomChangeListener} to know when the zoom is actually stopped. This
* method is supported if {@link
* android.hardware.Camera.Parameters#isSmoothZoomSupported} is true.
*
* @throws RuntimeException if the method fails.
*/
public native final void stopSmoothZoom();
/**
* Set the clockwise rotation of preview display in degrees. This affects
* the preview frames and the picture displayed after snapshot. This method
* is useful for portrait mode applications. Note that preview display of
* front-facing cameras is flipped horizontally before the rotation, that
* is, the image is reflected along the central vertical axis of the camera
* sensor. So the users can see themselves as looking into a mirror.
*
* This does not affect the order of byte array passed in {@link
* PreviewCallback#onPreviewFrame}, JPEG pictures, or recorded videos. This
* method is not allowed to be called during preview.
*
*
If you want to make the camera image show in the same orientation as
* the display, you can use the following code.
*
* public static void setCameraDisplayOrientation(Activity activity,
* int cameraId, android.hardware.Camera camera) {
* android.hardware.Camera.CameraInfo info =
* new android.hardware.Camera.CameraInfo();
* android.hardware.Camera.getCameraInfo(cameraId, info);
* int rotation = activity.getWindowManager().getDefaultDisplay()
* .getRotation();
* int degrees = 0;
* switch (rotation) {
* case Surface.ROTATION_0: degrees = 0; break;
* case Surface.ROTATION_90: degrees = 90; break;
* case Surface.ROTATION_180: degrees = 180; break;
* case Surface.ROTATION_270: degrees = 270; break;
* }
*
* int result;
* if (info.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {
* result = (info.orientation + degrees) % 360;
* result = (360 - result) % 360; // compensate the mirror
* } else { // back-facing
* result = (info.orientation - degrees + 360) % 360;
* }
* camera.setDisplayOrientation(result);
* }
*
*
* Starting from API level 14, this method can be called when preview is
* active.
*
*
Note: Before API level 24, the default value for orientation is 0. Starting in
* API level 24, the default orientation will be such that applications in forced-landscape mode
* will have correct preview orientation, which may be either a default of 0 or
* 180. Applications that operate in portrait mode or allow for changing orientation must still
* call this method after each orientation change to ensure correct preview display in all
* cases.
*
* @param degrees the angle that the picture will be rotated clockwise.
* Valid values are 0, 90, 180, and 270.
* @throws RuntimeException if setting orientation fails; usually this would
* be because of a hardware or other low-level error, or because
* release() has been called on this Camera instance.
* @see #setPreviewDisplay(SurfaceHolder)
*/
public native final void setDisplayOrientation(int degrees);
/**
* Enable or disable the default shutter sound when taking a picture.
*
* By default, the camera plays the system-defined camera shutter sound
* when {@link #takePicture} is called. Using this method, the shutter sound
* can be disabled. It is strongly recommended that an alternative shutter
* sound is played in the {@link ShutterCallback} when the system shutter
* sound is disabled.
*
* Note that devices may not always allow disabling the camera shutter
* sound. If the shutter sound state cannot be set to the desired value,
* this method will return false. {@link CameraInfo#canDisableShutterSound}
* can be used to determine whether the device will allow the shutter sound
* to be disabled.
*
* @param enabled whether the camera should play the system shutter sound
* when {@link #takePicture takePicture} is called.
* @return {@code true} if the shutter sound state was successfully
* changed. {@code false} if the shutter sound state could not be
* changed. {@code true} is also returned if shutter sound playback
* is already set to the requested state.
* @throws RuntimeException if the call fails; usually this would be because
* of a hardware or other low-level error, or because release() has been
* called on this Camera instance.
* @see #takePicture
* @see CameraInfo#canDisableShutterSound
* @see ShutterCallback
*/
public final boolean enableShutterSound(boolean enabled) {
if (!enabled) {
IBinder b = ServiceManager.getService(Context.AUDIO_SERVICE);
IAudioService audioService = IAudioService.Stub.asInterface(b);
try {
if (audioService.isCameraSoundForced()) return false;
} catch (RemoteException e) {
Log.e(TAG, "Audio service is unavailable for queries");
}
}
return _enableShutterSound(enabled);
}
/**
* Disable the shutter sound unconditionally.
*
*
* This is only guaranteed to work for legacy cameras
* (i.e. initialized with {@link #cameraInitUnspecified}). Trying to call this on
* a regular camera will force a conditional check in the camera service.
*
*
* @return {@code true} if the shutter sound state was successfully
* changed. {@code false} if the shutter sound state could not be
* changed. {@code true} is also returned if shutter sound playback
* is already set to the requested state.
*
* @hide
*/
public final boolean disableShutterSound() {
return _enableShutterSound(/*enabled*/false);
}
private native final boolean _enableShutterSound(boolean enabled);
/**
* Callback interface for zoom changes during a smooth zoom operation.
*
* @see #setZoomChangeListener(OnZoomChangeListener)
* @see #startSmoothZoom(int)
*
* @deprecated We recommend using the new {@link android.hardware.camera2} API for new
* applications.
*/
@Deprecated
public interface OnZoomChangeListener
{
/**
* Called when the zoom value has changed during a smooth zoom.
*
* @param zoomValue the current zoom value. In smooth zoom mode, camera
* calls this for every new zoom value.
* @param stopped whether smooth zoom is stopped. If the value is true,
* this is the last zoom update for the application.
* @param camera the Camera service object
*/
void onZoomChange(int zoomValue, boolean stopped, Camera camera);
};
/**
* Registers a listener to be notified when the zoom value is updated by the
* camera driver during smooth zoom.
*
* @param listener the listener to notify
* @see #startSmoothZoom(int)
*/
public final void setZoomChangeListener(OnZoomChangeListener listener)
{
mZoomListener = listener;
}
/**
* Callback interface for face detected in the preview frame.
*
* @deprecated We recommend using the new {@link android.hardware.camera2} API for new
* applications.
*/
@Deprecated
public interface FaceDetectionListener
{
/**
* Notify the listener of the detected faces in the preview frame.
*
* @param faces The detected faces in a list
* @param camera The {@link Camera} service object
*/
void onFaceDetection(Face[] faces, Camera camera);
}
/**
* Registers a listener to be notified about the faces detected in the
* preview frame.
*
* @param listener the listener to notify
* @see #startFaceDetection()
*/
public final void setFaceDetectionListener(FaceDetectionListener listener)
{
mFaceListener = listener;
}
/**
* Starts the face detection. This should be called after preview is started.
* The camera will notify {@link FaceDetectionListener} of the detected
* faces in the preview frame. The detected faces may be the same as the
* previous ones. Applications should call {@link #stopFaceDetection} to
* stop the face detection. This method is supported if {@link
* Parameters#getMaxNumDetectedFaces()} returns a number larger than 0.
* If the face detection has started, apps should not call this again.
*
* When the face detection is running, {@link Parameters#setWhiteBalance(String)},
* {@link Parameters#setFocusAreas(List)}, and {@link Parameters#setMeteringAreas(List)}
* have no effect. The camera uses the detected faces to do auto-white balance,
* auto exposure, and autofocus.
*
*
If the apps call {@link #autoFocus(AutoFocusCallback)}, the camera
* will stop sending face callbacks. The last face callback indicates the
* areas used to do autofocus. After focus completes, face detection will
* resume sending face callbacks. If the apps call {@link
* #cancelAutoFocus()}, the face callbacks will also resume.
*
* After calling {@link #takePicture(Camera.ShutterCallback, Camera.PictureCallback,
* Camera.PictureCallback)} or {@link #stopPreview()}, and then resuming
* preview with {@link #startPreview()}, the apps should call this method
* again to resume face detection.
*
* @throws IllegalArgumentException if the face detection is unsupported.
* @throws RuntimeException if the method fails or the face detection is
* already running.
* @see FaceDetectionListener
* @see #stopFaceDetection()
* @see Parameters#getMaxNumDetectedFaces()
*/
public final void startFaceDetection() {
if (mFaceDetectionRunning) {
throw new RuntimeException("Face detection is already running");
}
_startFaceDetection(CAMERA_FACE_DETECTION_HW);
mFaceDetectionRunning = true;
}
/**
* Stops the face detection.
*
* @see #startFaceDetection()
*/
public final void stopFaceDetection() {
_stopFaceDetection();
mFaceDetectionRunning = false;
}
private native final void _startFaceDetection(int type);
private native final void _stopFaceDetection();
/**
* Information about a face identified through camera face detection.
*
* When face detection is used with a camera, the {@link FaceDetectionListener} returns a
* list of face objects for use in focusing and metering.
*
* @see FaceDetectionListener
* @deprecated We recommend using the new {@link android.hardware.camera2} API for new
* applications.
*/
@Deprecated
public static class Face {
/**
* Create an empty face.
*/
public Face() {
}
/**
* Bounds of the face. (-1000, -1000) represents the top-left of the
* camera field of view, and (1000, 1000) represents the bottom-right of
* the field of view. For example, suppose the size of the viewfinder UI
* is 800x480. The rect passed from the driver is (-1000, -1000, 0, 0).
* The corresponding viewfinder rect should be (0, 0, 400, 240). It is
* guaranteed left < right and top < bottom. The coordinates can be
* smaller than -1000 or bigger than 1000. But at least one vertex will
* be within (-1000, -1000) and (1000, 1000).
*
* The direction is relative to the sensor orientation, that is, what
* the sensor sees. The direction is not affected by the rotation or
* mirroring of {@link #setDisplayOrientation(int)}. The face bounding
* rectangle does not provide any information about face orientation.
*
* Here is the matrix to convert driver coordinates to View coordinates
* in pixels.
*
* Matrix matrix = new Matrix();
* CameraInfo info = CameraHolder.instance().getCameraInfo()[cameraId];
* // Need mirror for front camera.
* boolean mirror = (info.facing == CameraInfo.CAMERA_FACING_FRONT);
* matrix.setScale(mirror ? -1 : 1, 1);
* // This is the value for android.hardware.Camera.setDisplayOrientation.
* matrix.postRotate(displayOrientation);
* // Camera driver coordinates range from (-1000, -1000) to (1000, 1000).
* // UI coordinates range from (0, 0) to (width, height).
* matrix.postScale(view.getWidth() / 2000f, view.getHeight() / 2000f);
* matrix.postTranslate(view.getWidth() / 2f, view.getHeight() / 2f);
*
*
* @see #startFaceDetection()
*/
public Rect rect;
/**
* The confidence level for the detection of the face. The range is 1 to
* 100. 100 is the highest confidence.
*
* Depending on the device, even very low-confidence faces may be
* listed, so applications should filter out faces with low confidence,
* depending on the use case. For a typical point-and-shoot camera
* application that wishes to display rectangles around detected faces,
* filtering out faces with confidence less than 50 is recommended.
*
* @see #startFaceDetection()
*/
public int score;
/**
* An unique id per face while the face is visible to the tracker. If
* the face leaves the field-of-view and comes back, it will get a new
* id. This is an optional field, may not be supported on all devices.
* If not supported, id will always be set to -1. The optional fields
* are supported as a set. Either they are all valid, or none of them
* are.
*/
public int id = -1;
/**
* The coordinates of the center of the left eye. The coordinates are in
* the same space as the ones for {@link #rect}. This is an optional
* field, may not be supported on all devices. If not supported, the
* value will always be set to null. The optional fields are supported
* as a set. Either they are all valid, or none of them are.
*/
public Point leftEye = null;
/**
* The coordinates of the center of the right eye. The coordinates are
* in the same space as the ones for {@link #rect}.This is an optional
* field, may not be supported on all devices. If not supported, the
* value will always be set to null. The optional fields are supported
* as a set. Either they are all valid, or none of them are.
*/
public Point rightEye = null;
/**
* The coordinates of the center of the mouth. The coordinates are in
* the same space as the ones for {@link #rect}. This is an optional
* field, may not be supported on all devices. If not supported, the
* value will always be set to null. The optional fields are supported
* as a set. Either they are all valid, or none of them are.
*/
public Point mouth = null;
}
/**
* Unspecified camera error.
* @see Camera.ErrorCallback
*/
public static final int CAMERA_ERROR_UNKNOWN = 1;
/**
* Camera was disconnected due to use by higher priority user.
* @see Camera.ErrorCallback
*/
public static final int CAMERA_ERROR_EVICTED = 2;
/**
* Media server died. In this case, the application must release the
* Camera object and instantiate a new one.
* @see Camera.ErrorCallback
*/
public static final int CAMERA_ERROR_SERVER_DIED = 100;
/**
* Callback interface for camera error notification.
*
* @see #setErrorCallback(ErrorCallback)
*
* @deprecated We recommend using the new {@link android.hardware.camera2} API for new
* applications.
*/
@Deprecated
public interface ErrorCallback
{
/**
* Callback for camera errors.
* @param error error code:
*
* - {@link #CAMERA_ERROR_UNKNOWN}
*
- {@link #CAMERA_ERROR_SERVER_DIED}
*
* @param camera the Camera service object
*/
void onError(int error, Camera camera);
};
/**
* Registers a callback to be invoked when an error occurs.
* @param cb The callback to run
*/
public final void setErrorCallback(ErrorCallback cb)
{
mErrorCallback = cb;
}
private native final void native_setParameters(String params);
private native final String native_getParameters();
/**
* Changes the settings for this Camera service.
*
* @param params the Parameters to use for this Camera service
* @throws RuntimeException if any parameter is invalid or not supported.
* @see #getParameters()
*/
public void setParameters(Parameters params) {
// If using preview allocations, don't allow preview size changes
if (mUsingPreviewAllocation) {
Size newPreviewSize = params.getPreviewSize();
Size currentPreviewSize = getParameters().getPreviewSize();
if (newPreviewSize.width != currentPreviewSize.width ||
newPreviewSize.height != currentPreviewSize.height) {
throw new IllegalStateException("Cannot change preview size" +
" while a preview allocation is configured.");
}
}
native_setParameters(params.flatten());
}
/**
* Returns the current settings for this Camera service.
* If modifications are made to the returned Parameters, they must be passed
* to {@link #setParameters(Camera.Parameters)} to take effect.
*
* @throws RuntimeException if reading parameters fails; usually this would
* be because of a hardware or other low-level error, or because
* release() has been called on this Camera instance.
* @see #setParameters(Camera.Parameters)
*/
public Parameters getParameters() {
Parameters p = new Parameters();
String s = native_getParameters();
p.unflatten(s);
return p;
}
/**
* Returns an empty {@link Parameters} for testing purpose.
*
* @return a Parameter object.
*
* @hide
*/
public static Parameters getEmptyParameters() {
Camera camera = new Camera();
return camera.new Parameters();
}
/**
* Returns a copied {@link Parameters}; for shim use only.
*
* @param parameters a non-{@code null} parameters
* @return a Parameter object, with all the parameters copied from {@code parameters}.
*
* @throws NullPointerException if {@code parameters} was {@code null}
* @hide
*/
public static Parameters getParametersCopy(Camera.Parameters parameters) {
if (parameters == null) {
throw new NullPointerException("parameters must not be null");
}
Camera camera = parameters.getOuter();
Parameters p = camera.new Parameters();
p.copyFrom(parameters);
return p;
}
/**
* Image size (width and height dimensions).
* @deprecated We recommend using the new {@link android.hardware.camera2} API for new
* applications.
*/
@Deprecated
public class Size {
/**
* Sets the dimensions for pictures.
*
* @param w the photo width (pixels)
* @param h the photo height (pixels)
*/
public Size(int w, int h) {
width = w;
height = h;
}
/**
* Compares {@code obj} to this size.
*
* @param obj the object to compare this size with.
* @return {@code true} if the width and height of {@code obj} is the
* same as those of this size. {@code false} otherwise.
*/
@Override
public boolean equals(Object obj) {
if (!(obj instanceof Size)) {
return false;
}
Size s = (Size) obj;
return width == s.width && height == s.height;
}
@Override
public int hashCode() {
return width * 32713 + height;
}
/** width of the picture */
public int width;
/** height of the picture */
public int height;
};
/**
* The Area class is used for choosing specific metering and focus areas for
* the camera to use when calculating auto-exposure, auto-white balance, and
* auto-focus.
*
* To find out how many simultaneous areas a given camera supports, use
* {@link Parameters#getMaxNumMeteringAreas()} and
* {@link Parameters#getMaxNumFocusAreas()}. If metering or focusing area
* selection is unsupported, these methods will return 0.
*
* Each Area consists of a rectangle specifying its bounds, and a weight
* that determines its importance. The bounds are relative to the camera's
* current field of view. The coordinates are mapped so that (-1000, -1000)
* is always the top-left corner of the current field of view, and (1000,
* 1000) is always the bottom-right corner of the current field of
* view. Setting Areas with bounds outside that range is not allowed. Areas
* with zero or negative width or height are not allowed.
*
* The weight must range from 1 to 1000, and represents a weight for
* every pixel in the area. This means that a large metering area with
* the same weight as a smaller area will have more effect in the
* metering result. Metering areas can overlap and the driver
* will add the weights in the overlap region.
*
* @see Parameters#setFocusAreas(List)
* @see Parameters#getFocusAreas()
* @see Parameters#getMaxNumFocusAreas()
* @see Parameters#setMeteringAreas(List)
* @see Parameters#getMeteringAreas()
* @see Parameters#getMaxNumMeteringAreas()
*
* @deprecated We recommend using the new {@link android.hardware.camera2} API for new
* applications.
*/
@Deprecated
public static class Area {
/**
* Create an area with specified rectangle and weight.
*
* @param rect the bounds of the area.
* @param weight the weight of the area.
*/
public Area(Rect rect, int weight) {
this.rect = rect;
this.weight = weight;
}
/**
* Compares {@code obj} to this area.
*
* @param obj the object to compare this area with.
* @return {@code true} if the rectangle and weight of {@code obj} is
* the same as those of this area. {@code false} otherwise.
*/
@Override
public boolean equals(Object obj) {
if (!(obj instanceof Area)) {
return false;
}
Area a = (Area) obj;
if (rect == null) {
if (a.rect != null) return false;
} else {
if (!rect.equals(a.rect)) return false;
}
return weight == a.weight;
}
/**
* Bounds of the area. (-1000, -1000) represents the top-left of the
* camera field of view, and (1000, 1000) represents the bottom-right of
* the field of view. Setting bounds outside that range is not
* allowed. Bounds with zero or negative width or height are not
* allowed.
*
* @see Parameters#getFocusAreas()
* @see Parameters#getMeteringAreas()
*/
public Rect rect;
/**
* Weight of the area. The weight must range from 1 to 1000, and
* represents a weight for every pixel in the area. This means that a
* large metering area with the same weight as a smaller area will have
* more effect in the metering result. Metering areas can overlap and
* the driver will add the weights in the overlap region.
*
* @see Parameters#getFocusAreas()
* @see Parameters#getMeteringAreas()
*/
public int weight;
}
/**
* Camera service settings.
*
* To make camera parameters take effect, applications have to call
* {@link Camera#setParameters(Camera.Parameters)}. For example, after
* {@link Camera.Parameters#setWhiteBalance} is called, white balance is not
* actually changed until {@link Camera#setParameters(Camera.Parameters)}
* is called with the changed parameters object.
*
*
Different devices may have different camera capabilities, such as
* picture size or flash modes. The application should query the camera
* capabilities before setting parameters. For example, the application
* should call {@link Camera.Parameters#getSupportedColorEffects()} before
* calling {@link Camera.Parameters#setColorEffect(String)}. If the
* camera does not support color effects,
* {@link Camera.Parameters#getSupportedColorEffects()} will return null.
*
* @deprecated We recommend using the new {@link android.hardware.camera2} API for new
* applications.
*/
@Deprecated
public class Parameters {
// Parameter keys to communicate with the camera driver.
private static final String KEY_PREVIEW_SIZE = "preview-size";
private static final String KEY_PREVIEW_FORMAT = "preview-format";
private static final String KEY_PREVIEW_FRAME_RATE = "preview-frame-rate";
private static final String KEY_PREVIEW_FPS_RANGE = "preview-fps-range";
private static final String KEY_PICTURE_SIZE = "picture-size";
private static final String KEY_PICTURE_FORMAT = "picture-format";
private static final String KEY_JPEG_THUMBNAIL_SIZE = "jpeg-thumbnail-size";
private static final String KEY_JPEG_THUMBNAIL_WIDTH = "jpeg-thumbnail-width";
private static final String KEY_JPEG_THUMBNAIL_HEIGHT = "jpeg-thumbnail-height";
private static final String KEY_JPEG_THUMBNAIL_QUALITY = "jpeg-thumbnail-quality";
private static final String KEY_JPEG_QUALITY = "jpeg-quality";
private static final String KEY_ROTATION = "rotation";
private static final String KEY_GPS_LATITUDE = "gps-latitude";
private static final String KEY_GPS_LONGITUDE = "gps-longitude";
private static final String KEY_GPS_ALTITUDE = "gps-altitude";
private static final String KEY_GPS_TIMESTAMP = "gps-timestamp";
private static final String KEY_GPS_PROCESSING_METHOD = "gps-processing-method";
private static final String KEY_WHITE_BALANCE = "whitebalance";
private static final String KEY_EFFECT = "effect";
private static final String KEY_ANTIBANDING = "antibanding";
private static final String KEY_SCENE_MODE = "scene-mode";
private static final String KEY_FLASH_MODE = "flash-mode";
private static final String KEY_FOCUS_MODE = "focus-mode";
private static final String KEY_FOCUS_AREAS = "focus-areas";
private static final String KEY_MAX_NUM_FOCUS_AREAS = "max-num-focus-areas";
private static final String KEY_FOCAL_LENGTH = "focal-length";
private static final String KEY_HORIZONTAL_VIEW_ANGLE = "horizontal-view-angle";
private static final String KEY_VERTICAL_VIEW_ANGLE = "vertical-view-angle";
private static final String KEY_EXPOSURE_COMPENSATION = "exposure-compensation";
private static final String KEY_MAX_EXPOSURE_COMPENSATION = "max-exposure-compensation";
private static final String KEY_MIN_EXPOSURE_COMPENSATION = "min-exposure-compensation";
private static final String KEY_EXPOSURE_COMPENSATION_STEP = "exposure-compensation-step";
private static final String KEY_AUTO_EXPOSURE_LOCK = "auto-exposure-lock";
private static final String KEY_AUTO_EXPOSURE_LOCK_SUPPORTED = "auto-exposure-lock-supported";
private static final String KEY_AUTO_WHITEBALANCE_LOCK = "auto-whitebalance-lock";
private static final String KEY_AUTO_WHITEBALANCE_LOCK_SUPPORTED = "auto-whitebalance-lock-supported";
private static final String KEY_METERING_AREAS = "metering-areas";
private static final String KEY_MAX_NUM_METERING_AREAS = "max-num-metering-areas";
private static final String KEY_ZOOM = "zoom";
private static final String KEY_MAX_ZOOM = "max-zoom";
private static final String KEY_ZOOM_RATIOS = "zoom-ratios";
private static final String KEY_ZOOM_SUPPORTED = "zoom-supported";
private static final String KEY_SMOOTH_ZOOM_SUPPORTED = "smooth-zoom-supported";
private static final String KEY_FOCUS_DISTANCES = "focus-distances";
private static final String KEY_VIDEO_SIZE = "video-size";
private static final String KEY_PREFERRED_PREVIEW_SIZE_FOR_VIDEO =
"preferred-preview-size-for-video";
private static final String KEY_MAX_NUM_DETECTED_FACES_HW = "max-num-detected-faces-hw";
private static final String KEY_MAX_NUM_DETECTED_FACES_SW = "max-num-detected-faces-sw";
private static final String KEY_RECORDING_HINT = "recording-hint";
private static final String KEY_VIDEO_SNAPSHOT_SUPPORTED = "video-snapshot-supported";
private static final String KEY_VIDEO_STABILIZATION = "video-stabilization";
private static final String KEY_VIDEO_STABILIZATION_SUPPORTED = "video-stabilization-supported";
// Parameter key suffix for supported values.
private static final String SUPPORTED_VALUES_SUFFIX = "-values";
private static final String TRUE = "true";
private static final String FALSE = "false";
// Values for white balance settings.
public static final String WHITE_BALANCE_AUTO = "auto";
public static final String WHITE_BALANCE_INCANDESCENT = "incandescent";
public static final String WHITE_BALANCE_FLUORESCENT = "fluorescent";
public static final String WHITE_BALANCE_WARM_FLUORESCENT = "warm-fluorescent";
public static final String WHITE_BALANCE_DAYLIGHT = "daylight";
public static final String WHITE_BALANCE_CLOUDY_DAYLIGHT = "cloudy-daylight";
public static final String WHITE_BALANCE_TWILIGHT = "twilight";
public static final String WHITE_BALANCE_SHADE = "shade";
// Values for color effect settings.
public static final String EFFECT_NONE = "none";
public static final String EFFECT_MONO = "mono";
public static final String EFFECT_NEGATIVE = "negative";
public static final String EFFECT_SOLARIZE = "solarize";
public static final String EFFECT_SEPIA = "sepia";
public static final String EFFECT_POSTERIZE = "posterize";
public static final String EFFECT_WHITEBOARD = "whiteboard";
public static final String EFFECT_BLACKBOARD = "blackboard";
public static final String EFFECT_AQUA = "aqua";
// Values for antibanding settings.
public static final String ANTIBANDING_AUTO = "auto";
public static final String ANTIBANDING_50HZ = "50hz";
public static final String ANTIBANDING_60HZ = "60hz";
public static final String ANTIBANDING_OFF = "off";
// Values for flash mode settings.
/**
* Flash will not be fired.
*/
public static final String FLASH_MODE_OFF = "off";
/**
* Flash will be fired automatically when required. The flash may be fired
* during preview, auto-focus, or snapshot depending on the driver.
*/
public static final String FLASH_MODE_AUTO = "auto";
/**
* Flash will always be fired during snapshot. The flash may also be
* fired during preview or auto-focus depending on the driver.
*/
public static final String FLASH_MODE_ON = "on";
/**
* Flash will be fired in red-eye reduction mode.
*/
public static final String FLASH_MODE_RED_EYE = "red-eye";
/**
* Constant emission of light during preview, auto-focus and snapshot.
* This can also be used for video recording.
*/
public static final String FLASH_MODE_TORCH = "torch";
/**
* Scene mode is off.
*/
public static final String SCENE_MODE_AUTO = "auto";
/**
* Take photos of fast moving objects. Same as {@link
* #SCENE_MODE_SPORTS}.
*/
public static final String SCENE_MODE_ACTION = "action";
/**
* Take people pictures.
*/
public static final String SCENE_MODE_PORTRAIT = "portrait";
/**
* Take pictures on distant objects.
*/
public static final String SCENE_MODE_LANDSCAPE = "landscape";
/**
* Take photos at night.
*/
public static final String SCENE_MODE_NIGHT = "night";
/**
* Take people pictures at night.
*/
public static final String SCENE_MODE_NIGHT_PORTRAIT = "night-portrait";
/**
* Take photos in a theater. Flash light is off.
*/
public static final String SCENE_MODE_THEATRE = "theatre";
/**
* Take pictures on the beach.
*/
public static final String SCENE_MODE_BEACH = "beach";
/**
* Take pictures on the snow.
*/
public static final String SCENE_MODE_SNOW = "snow";
/**
* Take sunset photos.
*/
public static final String SCENE_MODE_SUNSET = "sunset";
/**
* Avoid blurry pictures (for example, due to hand shake).
*/
public static final String SCENE_MODE_STEADYPHOTO = "steadyphoto";
/**
* For shooting firework displays.
*/
public static final String SCENE_MODE_FIREWORKS = "fireworks";
/**
* Take photos of fast moving objects. Same as {@link
* #SCENE_MODE_ACTION}.
*/
public static final String SCENE_MODE_SPORTS = "sports";
/**
* Take indoor low-light shot.
*/
public static final String SCENE_MODE_PARTY = "party";
/**
* Capture the naturally warm color of scenes lit by candles.
*/
public static final String SCENE_MODE_CANDLELIGHT = "candlelight";
/**
* Applications are looking for a barcode. Camera driver will be
* optimized for barcode reading.
*/
public static final String SCENE_MODE_BARCODE = "barcode";
/**
* Capture a scene using high dynamic range imaging techniques. The
* camera will return an image that has an extended dynamic range
* compared to a regular capture. Capturing such an image may take
* longer than a regular capture.
*/
public static final String SCENE_MODE_HDR = "hdr";
/**
* Auto-focus mode. Applications should call {@link
* #autoFocus(AutoFocusCallback)} to start the focus in this mode.
*/
public static final String FOCUS_MODE_AUTO = "auto";
/**
* Focus is set at infinity. Applications should not call
* {@link #autoFocus(AutoFocusCallback)} in this mode.
*/
public static final String FOCUS_MODE_INFINITY = "infinity";
/**
* Macro (close-up) focus mode. Applications should call
* {@link #autoFocus(AutoFocusCallback)} to start the focus in this
* mode.
*/
public static final String FOCUS_MODE_MACRO = "macro";
/**
* Focus is fixed. The camera is always in this mode if the focus is not
* adjustable. If the camera has auto-focus, this mode can fix the
* focus, which is usually at hyperfocal distance. Applications should
* not call {@link #autoFocus(AutoFocusCallback)} in this mode.
*/
public static final String FOCUS_MODE_FIXED = "fixed";
/**
* Extended depth of field (EDOF). Focusing is done digitally and
* continuously. Applications should not call {@link
* #autoFocus(AutoFocusCallback)} in this mode.
*/
public static final String FOCUS_MODE_EDOF = "edof";
/**
* Continuous auto focus mode intended for video recording. The camera
* continuously tries to focus. This is the best choice for video
* recording because the focus changes smoothly . Applications still can
* call {@link #takePicture(Camera.ShutterCallback,
* Camera.PictureCallback, Camera.PictureCallback)} in this mode but the
* subject may not be in focus. Auto focus starts when the parameter is
* set.
*
* Since API level 14, applications can call {@link
* #autoFocus(AutoFocusCallback)} in this mode. The focus callback will
* immediately return with a boolean that indicates whether the focus is
* sharp or not. The focus position is locked after autoFocus call. If
* applications want to resume the continuous focus, cancelAutoFocus
* must be called. Restarting the preview will not resume the continuous
* autofocus. To stop continuous focus, applications should change the
* focus mode to other modes.
*
* @see #FOCUS_MODE_CONTINUOUS_PICTURE
*/
public static final String FOCUS_MODE_CONTINUOUS_VIDEO = "continuous-video";
/**
* Continuous auto focus mode intended for taking pictures. The camera
* continuously tries to focus. The speed of focus change is more
* aggressive than {@link #FOCUS_MODE_CONTINUOUS_VIDEO}. Auto focus
* starts when the parameter is set.
*
* Applications can call {@link #autoFocus(AutoFocusCallback)} in
* this mode. If the autofocus is in the middle of scanning, the focus
* callback will return when it completes. If the autofocus is not
* scanning, the focus callback will immediately return with a boolean
* that indicates whether the focus is sharp or not. The apps can then
* decide if they want to take a picture immediately or to change the
* focus mode to auto, and run a full autofocus cycle. The focus
* position is locked after autoFocus call. If applications want to
* resume the continuous focus, cancelAutoFocus must be called.
* Restarting the preview will not resume the continuous autofocus. To
* stop continuous focus, applications should change the focus mode to
* other modes.
*
* @see #FOCUS_MODE_CONTINUOUS_VIDEO
*/
public static final String FOCUS_MODE_CONTINUOUS_PICTURE = "continuous-picture";
// Indices for focus distance array.
/**
* The array index of near focus distance for use with
* {@link #getFocusDistances(float[])}.
*/
public static final int FOCUS_DISTANCE_NEAR_INDEX = 0;
/**
* The array index of optimal focus distance for use with
* {@link #getFocusDistances(float[])}.
*/
public static final int FOCUS_DISTANCE_OPTIMAL_INDEX = 1;
/**
* The array index of far focus distance for use with
* {@link #getFocusDistances(float[])}.
*/
public static final int FOCUS_DISTANCE_FAR_INDEX = 2;
/**
* The array index of minimum preview fps for use with {@link
* #getPreviewFpsRange(int[])} or {@link
* #getSupportedPreviewFpsRange()}.
*/
public static final int PREVIEW_FPS_MIN_INDEX = 0;
/**
* The array index of maximum preview fps for use with {@link
* #getPreviewFpsRange(int[])} or {@link
* #getSupportedPreviewFpsRange()}.
*/
public static final int PREVIEW_FPS_MAX_INDEX = 1;
// Formats for setPreviewFormat and setPictureFormat.
private static final String PIXEL_FORMAT_YUV422SP = "yuv422sp";
private static final String PIXEL_FORMAT_YUV420SP = "yuv420sp";
private static final String PIXEL_FORMAT_YUV422I = "yuv422i-yuyv";
private static final String PIXEL_FORMAT_YUV420P = "yuv420p";
private static final String PIXEL_FORMAT_RGB565 = "rgb565";
private static final String PIXEL_FORMAT_JPEG = "jpeg";
private static final String PIXEL_FORMAT_BAYER_RGGB = "bayer-rggb";
/**
* Order matters: Keys that are {@link #set(String, String) set} later
* will take precedence over keys that are set earlier (if the two keys
* conflict with each other).
*
* One example is {@link #setPreviewFpsRange(int, int)} , since it
* conflicts with {@link #setPreviewFrameRate(int)} whichever key is set later
* is the one that will take precedence.
*
*/
private final LinkedHashMap mMap;
private Parameters() {
mMap = new LinkedHashMap(/*initialCapacity*/64);
}
/**
* Overwrite existing parameters with a copy of the ones from {@code other}.
*
* For use by the legacy shim only.
*
* @hide
*/
public void copyFrom(Parameters other) {
if (other == null) {
throw new NullPointerException("other must not be null");
}
mMap.putAll(other.mMap);
}
private Camera getOuter() {
return Camera.this;
}
/**
* Value equality check.
*
* @hide
*/
public boolean same(Parameters other) {
if (this == other) {
return true;
}
return other != null && Parameters.this.mMap.equals(other.mMap);
}
/**
* Writes the current Parameters to the log.
* @hide
* @deprecated
*/
@Deprecated
public void dump() {
Log.e(TAG, "dump: size=" + mMap.size());
for (String k : mMap.keySet()) {
Log.e(TAG, "dump: " + k + "=" + mMap.get(k));
}
}
/**
* Creates a single string with all the parameters set in
* this Parameters object.
* The {@link #unflatten(String)} method does the reverse.
*
* @return a String with all values from this Parameters object, in
* semi-colon delimited key-value pairs
*/
public String flatten() {
StringBuilder flattened = new StringBuilder(128);
for (String k : mMap.keySet()) {
flattened.append(k);
flattened.append("=");
flattened.append(mMap.get(k));
flattened.append(";");
}
// chop off the extra semicolon at the end
flattened.deleteCharAt(flattened.length()-1);
return flattened.toString();
}
/**
* Takes a flattened string of parameters and adds each one to
* this Parameters object.
* The {@link #flatten()} method does the reverse.
*
* @param flattened a String of parameters (key-value paired) that
* are semi-colon delimited
*/
public void unflatten(String flattened) {
mMap.clear();
TextUtils.StringSplitter splitter = new TextUtils.SimpleStringSplitter(';');
splitter.setString(flattened);
for (String kv : splitter) {
int pos = kv.indexOf('=');
if (pos == -1) {
continue;
}
String k = kv.substring(0, pos);
String v = kv.substring(pos + 1);
mMap.put(k, v);
}
}
public void remove(String key) {
mMap.remove(key);
}
/**
* Sets a String parameter.
*
* @param key the key name for the parameter
* @param value the String value of the parameter
*/
public void set(String key, String value) {
if (key.indexOf('=') != -1 || key.indexOf(';') != -1 || key.indexOf(0) != -1) {
Log.e(TAG, "Key \"" + key + "\" contains invalid character (= or ; or \\0)");
return;
}
if (value.indexOf('=') != -1 || value.indexOf(';') != -1 || value.indexOf(0) != -1) {
Log.e(TAG, "Value \"" + value + "\" contains invalid character (= or ; or \\0)");
return;
}
put(key, value);
}
/**
* Sets an integer parameter.
*
* @param key the key name for the parameter
* @param value the int value of the parameter
*/
public void set(String key, int value) {
put(key, Integer.toString(value));
}
private void put(String key, String value) {
/*
* Remove the key if it already exists.
*
* This way setting a new value for an already existing key will always move
* that key to be ordered the latest in the map.
*/
mMap.remove(key);
mMap.put(key, value);
}
private void set(String key, List areas) {
if (areas == null) {
set(key, "(0,0,0,0,0)");
} else {
StringBuilder buffer = new StringBuilder();
for (int i = 0; i < areas.size(); i++) {
Area area = areas.get(i);
Rect rect = area.rect;
buffer.append('(');
buffer.append(rect.left);
buffer.append(',');
buffer.append(rect.top);
buffer.append(',');
buffer.append(rect.right);
buffer.append(',');
buffer.append(rect.bottom);
buffer.append(',');
buffer.append(area.weight);
buffer.append(')');
if (i != areas.size() - 1) buffer.append(',');
}
set(key, buffer.toString());
}
}
/**
* Returns the value of a String parameter.
*
* @param key the key name for the parameter
* @return the String value of the parameter
*/
public String get(String key) {
return mMap.get(key);
}
/**
* Returns the value of an integer parameter.
*
* @param key the key name for the parameter
* @return the int value of the parameter
*/
public int getInt(String key) {
return Integer.parseInt(mMap.get(key));
}
/**
* Sets the dimensions for preview pictures. If the preview has already
* started, applications should stop the preview first before changing
* preview size.
*
* The sides of width and height are based on camera orientation. That
* is, the preview size is the size before it is rotated by display
* orientation. So applications need to consider the display orientation
* while setting preview size. For example, suppose the camera supports
* both 480x320 and 320x480 preview sizes. The application wants a 3:2
* preview ratio. If the display orientation is set to 0 or 180, preview
* size should be set to 480x320. If the display orientation is set to
* 90 or 270, preview size should be set to 320x480. The display
* orientation should also be considered while setting picture size and
* thumbnail size.
*
* @param width the width of the pictures, in pixels
* @param height the height of the pictures, in pixels
* @see #setDisplayOrientation(int)
* @see #getCameraInfo(int, CameraInfo)
* @see #setPictureSize(int, int)
* @see #setJpegThumbnailSize(int, int)
*/
public void setPreviewSize(int width, int height) {
String v = Integer.toString(width) + "x" + Integer.toString(height);
set(KEY_PREVIEW_SIZE, v);
}
/**
* Returns the dimensions setting for preview pictures.
*
* @return a Size object with the width and height setting
* for the preview picture
*/
public Size getPreviewSize() {
String pair = get(KEY_PREVIEW_SIZE);
return strToSize(pair);
}
/**
* Gets the supported preview sizes.
*
* @return a list of Size object. This method will always return a list
* with at least one element.
*/
public List getSupportedPreviewSizes() {
String str = get(KEY_PREVIEW_SIZE + SUPPORTED_VALUES_SUFFIX);
return splitSize(str);
}
/**
* Gets the supported video frame sizes that can be used by
* MediaRecorder.
*
* If the returned list is not null, the returned list will contain at
* least one Size and one of the sizes in the returned list must be
* passed to MediaRecorder.setVideoSize() for camcorder application if
* camera is used as the video source. In this case, the size of the
* preview can be different from the resolution of the recorded video
* during video recording.
*
* @return a list of Size object if camera has separate preview and
* video output; otherwise, null is returned.
* @see #getPreferredPreviewSizeForVideo()
*/
public List getSupportedVideoSizes() {
String str = get(KEY_VIDEO_SIZE + SUPPORTED_VALUES_SUFFIX);
return splitSize(str);
}
/**
* Returns the preferred or recommended preview size (width and height)
* in pixels for video recording. Camcorder applications should
* set the preview size to a value that is not larger than the
* preferred preview size. In other words, the product of the width
* and height of the preview size should not be larger than that of
* the preferred preview size. In addition, we recommend to choose a
* preview size that has the same aspect ratio as the resolution of
* video to be recorded.
*
* @return the preferred preview size (width and height) in pixels for
* video recording if getSupportedVideoSizes() does not return
* null; otherwise, null is returned.
* @see #getSupportedVideoSizes()
*/
public Size getPreferredPreviewSizeForVideo() {
String pair = get(KEY_PREFERRED_PREVIEW_SIZE_FOR_VIDEO);
return strToSize(pair);
}
/**
* Sets the dimensions for EXIF thumbnail in Jpeg picture. If
* applications set both width and height to 0, EXIF will not contain
* thumbnail.
*
* Applications need to consider the display orientation. See {@link
* #setPreviewSize(int,int)} for reference.
*
* @param width the width of the thumbnail, in pixels
* @param height the height of the thumbnail, in pixels
* @see #setPreviewSize(int,int)
*/
public void setJpegThumbnailSize(int width, int height) {
set(KEY_JPEG_THUMBNAIL_WIDTH, width);
set(KEY_JPEG_THUMBNAIL_HEIGHT, height);
}
/**
* Returns the dimensions for EXIF thumbnail in Jpeg picture.
*
* @return a Size object with the height and width setting for the EXIF
* thumbnails
*/
public Size getJpegThumbnailSize() {
return new Size(getInt(KEY_JPEG_THUMBNAIL_WIDTH),
getInt(KEY_JPEG_THUMBNAIL_HEIGHT));
}
/**
* Gets the supported jpeg thumbnail sizes.
*
* @return a list of Size object. This method will always return a list
* with at least two elements. Size 0,0 (no thumbnail) is always
* supported.
*/
public List getSupportedJpegThumbnailSizes() {
String str = get(KEY_JPEG_THUMBNAIL_SIZE + SUPPORTED_VALUES_SUFFIX);
return splitSize(str);
}
/**
* Sets the quality of the EXIF thumbnail in Jpeg picture.
*
* @param quality the JPEG quality of the EXIF thumbnail. The range is 1
* to 100, with 100 being the best.
*/
public void setJpegThumbnailQuality(int quality) {
set(KEY_JPEG_THUMBNAIL_QUALITY, quality);
}
/**
* Returns the quality setting for the EXIF thumbnail in Jpeg picture.
*
* @return the JPEG quality setting of the EXIF thumbnail.
*/
public int getJpegThumbnailQuality() {
return getInt(KEY_JPEG_THUMBNAIL_QUALITY);
}
/**
* Sets Jpeg quality of captured picture.
*
* @param quality the JPEG quality of captured picture. The range is 1
* to 100, with 100 being the best.
*/
public void setJpegQuality(int quality) {
set(KEY_JPEG_QUALITY, quality);
}
/**
* Returns the quality setting for the JPEG picture.
*
* @return the JPEG picture quality setting.
*/
public int getJpegQuality() {
return getInt(KEY_JPEG_QUALITY);
}
/**
* Sets the rate at which preview frames are received. This is the
* target frame rate. The actual frame rate depends on the driver.
*
* @param fps the frame rate (frames per second)
* @deprecated replaced by {@link #setPreviewFpsRange(int,int)}
*/
@Deprecated
public void setPreviewFrameRate(int fps) {
set(KEY_PREVIEW_FRAME_RATE, fps);
}
/**
* Returns the setting for the rate at which preview frames are
* received. This is the target frame rate. The actual frame rate
* depends on the driver.
*
* @return the frame rate setting (frames per second)
* @deprecated replaced by {@link #getPreviewFpsRange(int[])}
*/
@Deprecated
public int getPreviewFrameRate() {
return getInt(KEY_PREVIEW_FRAME_RATE);
}
/**
* Gets the supported preview frame rates.
*
* @return a list of supported preview frame rates. null if preview
* frame rate setting is not supported.
* @deprecated replaced by {@link #getSupportedPreviewFpsRange()}
*/
@Deprecated
public List getSupportedPreviewFrameRates() {
String str = get(KEY_PREVIEW_FRAME_RATE + SUPPORTED_VALUES_SUFFIX);
return splitInt(str);
}
/**
* Sets the minimum and maximum preview fps. This controls the rate of
* preview frames received in {@link PreviewCallback}. The minimum and
* maximum preview fps must be one of the elements from {@link
* #getSupportedPreviewFpsRange}.
*
* @param min the minimum preview fps (scaled by 1000).
* @param max the maximum preview fps (scaled by 1000).
* @throws RuntimeException if fps range is invalid.
* @see #setPreviewCallbackWithBuffer(Camera.PreviewCallback)
* @see #getSupportedPreviewFpsRange()
*/
public void setPreviewFpsRange(int min, int max) {
set(KEY_PREVIEW_FPS_RANGE, "" + min + "," + max);
}
/**
* Returns the current minimum and maximum preview fps. The values are
* one of the elements returned by {@link #getSupportedPreviewFpsRange}.
*
* @return range the minimum and maximum preview fps (scaled by 1000).
* @see #PREVIEW_FPS_MIN_INDEX
* @see #PREVIEW_FPS_MAX_INDEX
* @see #getSupportedPreviewFpsRange()
*/
public void getPreviewFpsRange(int[] range) {
if (range == null || range.length != 2) {
throw new IllegalArgumentException(
"range must be an array with two elements.");
}
splitInt(get(KEY_PREVIEW_FPS_RANGE), range);
}
/**
* Gets the supported preview fps (frame-per-second) ranges. Each range
* contains a minimum fps and maximum fps. If minimum fps equals to
* maximum fps, the camera outputs frames in fixed frame rate. If not,
* the camera outputs frames in auto frame rate. The actual frame rate
* fluctuates between the minimum and the maximum. The values are
* multiplied by 1000 and represented in integers. For example, if frame
* rate is 26.623 frames per second, the value is 26623.
*
* @return a list of supported preview fps ranges. This method returns a
* list with at least one element. Every element is an int array
* of two values - minimum fps and maximum fps. The list is
* sorted from small to large (first by maximum fps and then
* minimum fps).
* @see #PREVIEW_FPS_MIN_INDEX
* @see #PREVIEW_FPS_MAX_INDEX
*/
public List<int[]> getSupportedPreviewFpsRange() {
String str = get(KEY_PREVIEW_FPS_RANGE + SUPPORTED_VALUES_SUFFIX);
return splitRange(str);
}
/**
* Sets the image format for preview pictures.
* If this is never called, the default format will be
* {@link android.graphics.ImageFormat#NV21}, which
* uses the NV21 encoding format.
*
* Use {@link Parameters#getSupportedPreviewFormats} to get a list of
* the available preview formats.
*
*
It is strongly recommended that either
* {@link android.graphics.ImageFormat#NV21} or
* {@link android.graphics.ImageFormat#YV12} is used, since
* they are supported by all camera devices.
*
* For YV12, the image buffer that is received is not necessarily
* tightly packed, as there may be padding at the end of each row of
* pixel data, as described in
* {@link android.graphics.ImageFormat#YV12}. For camera callback data,
* it can be assumed that the stride of the Y and UV data is the
* smallest possible that meets the alignment requirements. That is, if
* the preview size is width x height, then the following
* equations describe the buffer index for the beginning of row
* y for the Y plane and row c for the U and V
* planes:
*
*
{@code
* yStride = (int) ceil(width / 16.0) * 16;
* uvStride = (int) ceil( (yStride / 2) / 16.0) * 16;
* ySize = yStride * height;
* uvSize = uvStride * height / 2;
* yRowIndex = yStride * y;
* uRowIndex = ySize + uvSize + uvStride * c;
* vRowIndex = ySize + uvStride * c;
* size = ySize + uvSize * 2;
* }
*
*
* @param pixel_format the desired preview picture format, defined by
* one of the {@link android.graphics.ImageFormat} constants. (E.g.,
* ImageFormat.NV21 (default), or
* ImageFormat.YV12)
*
* @see android.graphics.ImageFormat
* @see android.hardware.Camera.Parameters#getSupportedPreviewFormats
*/
public void setPreviewFormat(int pixel_format) {
String s = cameraFormatForPixelFormat(pixel_format);
if (s == null) {
throw new IllegalArgumentException(
"Invalid pixel_format=" + pixel_format);
}
set(KEY_PREVIEW_FORMAT, s);
}
/**
* Returns the image format for preview frames got from
* {@link PreviewCallback}.
*
* @return the preview format.
* @see android.graphics.ImageFormat
* @see #setPreviewFormat
*/
public int getPreviewFormat() {
return pixelFormatForCameraFormat(get(KEY_PREVIEW_FORMAT));
}
/**
* Gets the supported preview formats. {@link android.graphics.ImageFormat#NV21}
* is always supported. {@link android.graphics.ImageFormat#YV12}
* is always supported since API level 12.
*
* @return a list of supported preview formats. This method will always
* return a list with at least one element.
* @see android.graphics.ImageFormat
* @see #setPreviewFormat
*/
public List getSupportedPreviewFormats() {
String str = get(KEY_PREVIEW_FORMAT + SUPPORTED_VALUES_SUFFIX);
ArrayList formats = new ArrayList();
for (String s : split(str)) {
int f = pixelFormatForCameraFormat(s);
if (f == ImageFormat.UNKNOWN) continue;
formats.add(f);
}
return formats;
}
/**
* Sets the dimensions for pictures.
*
* Applications need to consider the display orientation. See {@link
* #setPreviewSize(int,int)} for reference.
*
* @param width the width for pictures, in pixels
* @param height the height for pictures, in pixels
* @see #setPreviewSize(int,int)
*
*/
public void setPictureSize(int width, int height) {
String v = Integer.toString(width) + "x" + Integer.toString(height);
set(KEY_PICTURE_SIZE, v);
}
/**
* Returns the dimension setting for pictures.
*
* @return a Size object with the height and width setting
* for pictures
*/
public Size getPictureSize() {
String pair = get(KEY_PICTURE_SIZE);
return strToSize(pair);
}
/**
* Gets the supported picture sizes.
*
* @return a list of supported picture sizes. This method will always
* return a list with at least one element.
*/
public List getSupportedPictureSizes() {
String str = get(KEY_PICTURE_SIZE + SUPPORTED_VALUES_SUFFIX);
return splitSize(str);
}
/**
* Sets the image format for pictures.
*
* @param pixel_format the desired picture format
* (ImageFormat.NV21,
* ImageFormat.RGB_565, or
* ImageFormat.JPEG)
* @see android.graphics.ImageFormat
*/
public void setPictureFormat(int pixel_format) {
String s = cameraFormatForPixelFormat(pixel_format);
if (s == null) {
throw new IllegalArgumentException(
"Invalid pixel_format=" + pixel_format);
}
set(KEY_PICTURE_FORMAT, s);
}
/**
* Returns the image format for pictures.
*
* @return the picture format
* @see android.graphics.ImageFormat
*/
public int getPictureFormat() {
return pixelFormatForCameraFormat(get(KEY_PICTURE_FORMAT));
}
/**
* Gets the supported picture formats.
*
* @return supported picture formats. This method will always return a
* list with at least one element.
* @see android.graphics.ImageFormat
*/
public List getSupportedPictureFormats() {
String str = get(KEY_PICTURE_FORMAT + SUPPORTED_VALUES_SUFFIX);
ArrayList formats = new ArrayList();
for (String s : split(str)) {
int f = pixelFormatForCameraFormat(s);
if (f == ImageFormat.UNKNOWN) continue;
formats.add(f);
}
return formats;
}
private String cameraFormatForPixelFormat(int pixel_format) {
switch(pixel_format) {
case ImageFormat.NV16: return PIXEL_FORMAT_YUV422SP;
case ImageFormat.NV21: return PIXEL_FORMAT_YUV420SP;
case ImageFormat.YUY2: return PIXEL_FORMAT_YUV422I;
case ImageFormat.YV12: return PIXEL_FORMAT_YUV420P;
case ImageFormat.RGB_565: return PIXEL_FORMAT_RGB565;
case ImageFormat.JPEG: return PIXEL_FORMAT_JPEG;
default: return null;
}
}
private int pixelFormatForCameraFormat(String format) {
if (format == null)
return ImageFormat.UNKNOWN;
if (format.equals(PIXEL_FORMAT_YUV422SP))
return ImageFormat.NV16;
if (format.equals(PIXEL_FORMAT_YUV420SP))
return ImageFormat.NV21;
if (format.equals(PIXEL_FORMAT_YUV422I))
return ImageFormat.YUY2;
if (format.equals(PIXEL_FORMAT_YUV420P))
return ImageFormat.YV12;
if (format.equals(PIXEL_FORMAT_RGB565))
return ImageFormat.RGB_565;
if (format.equals(PIXEL_FORMAT_JPEG))
return ImageFormat.JPEG;
return ImageFormat.UNKNOWN;
}
/**
* Sets the clockwise rotation angle in degrees relative to the
* orientation of the camera. This affects the pictures returned from
* JPEG {@link PictureCallback}. The camera driver may set orientation
* in the EXIF header without rotating the picture. Or the driver may
* rotate the picture and the EXIF thumbnail. If the Jpeg picture is
* rotated, the orientation in the EXIF header will be missing or 1 (row
* #0 is top and column #0 is left side).
*
*
* If applications want to rotate the picture to match the orientation
* of what users see, apps should use
* {@link android.view.OrientationEventListener} and
* {@link android.hardware.Camera.CameraInfo}. The value from
* OrientationEventListener is relative to the natural orientation of
* the device. CameraInfo.orientation is the angle between camera
* orientation and natural device orientation. The sum of the two is the
* rotation angle for back-facing camera. The difference of the two is
* the rotation angle for front-facing camera. Note that the JPEG
* pictures of front-facing cameras are not mirrored as in preview
* display.
*
*
* For example, suppose the natural orientation of the device is
* portrait. The device is rotated 270 degrees clockwise, so the device
* orientation is 270. Suppose a back-facing camera sensor is mounted in
* landscape and the top side of the camera sensor is aligned with the
* right edge of the display in natural orientation. So the camera
* orientation is 90. The rotation should be set to 0 (270 + 90).
*
*
The reference code is as follows.
*
*
* public void onOrientationChanged(int orientation) {
* if (orientation == ORIENTATION_UNKNOWN) return;
* android.hardware.Camera.CameraInfo info =
* new android.hardware.Camera.CameraInfo();
* android.hardware.Camera.getCameraInfo(cameraId, info);
* orientation = (orientation + 45) / 90 * 90;
* int rotation = 0;
* if (info.facing == CameraInfo.CAMERA_FACING_FRONT) {
* rotation = (info.orientation - orientation + 360) % 360;
* } else { // back-facing camera
* rotation = (info.orientation + orientation) % 360;
* }
* mParameters.setRotation(rotation);
* }
*
*
* @param rotation The rotation angle in degrees relative to the
* orientation of the camera. Rotation can only be 0,
* 90, 180 or 270.
* @throws IllegalArgumentException if rotation value is invalid.
* @see android.view.OrientationEventListener
* @see #getCameraInfo(int, CameraInfo)
*/
public void setRotation(int rotation) {
if (rotation == 0 || rotation == 90 || rotation == 180
|| rotation == 270) {
set(KEY_ROTATION, Integer.toString(rotation));
} else {
throw new IllegalArgumentException(
"Invalid rotation=" + rotation);
}
}
/**
* Sets GPS latitude coordinate. This will be stored in JPEG EXIF
* header.
*
* @param latitude GPS latitude coordinate.
*/
public void setGpsLatitude(double latitude) {
set(KEY_GPS_LATITUDE, Double.toString(latitude));
}
/**
* Sets GPS longitude coordinate. This will be stored in JPEG EXIF
* header.
*
* @param longitude GPS longitude coordinate.
*/
public void setGpsLongitude(double longitude) {
set(KEY_GPS_LONGITUDE, Double.toString(longitude));
}
/**
* Sets GPS altitude. This will be stored in JPEG EXIF header.
*
* @param altitude GPS altitude in meters.
*/
public void setGpsAltitude(double altitude) {
set(KEY_GPS_ALTITUDE, Double.toString(altitude));
}
/**
* Sets GPS timestamp. This will be stored in JPEG EXIF header.
*
* @param timestamp GPS timestamp (UTC in seconds since January 1,
* 1970).
*/
public void setGpsTimestamp(long timestamp) {
set(KEY_GPS_TIMESTAMP, Long.toString(timestamp));
}
/**
* Sets GPS processing method. The method will be stored in a UTF-8 string up to 31 bytes
* long, in the JPEG EXIF header.
*
* @param processing_method The processing method to get this location.
*/
public void setGpsProcessingMethod(String processing_method) {
set(KEY_GPS_PROCESSING_METHOD, processing_method);
}
/**
* Removes GPS latitude, longitude, altitude, and timestamp from the
* parameters.
*/
public void removeGpsData() {
remove(KEY_GPS_LATITUDE);
remove(KEY_GPS_LONGITUDE);
remove(KEY_GPS_ALTITUDE);
remove(KEY_GPS_TIMESTAMP);
remove(KEY_GPS_PROCESSING_METHOD);
}
/**
* Gets the current white balance setting.
*
* @return current white balance. null if white balance setting is not
* supported.
* @see #WHITE_BALANCE_AUTO
* @see #WHITE_BALANCE_INCANDESCENT
* @see #WHITE_BALANCE_FLUORESCENT
* @see #WHITE_BALANCE_WARM_FLUORESCENT
* @see #WHITE_BALANCE_DAYLIGHT
* @see #WHITE_BALANCE_CLOUDY_DAYLIGHT
* @see #WHITE_BALANCE_TWILIGHT
* @see #WHITE_BALANCE_SHADE
*
*/
public String getWhiteBalance() {
return get(KEY_WHITE_BALANCE);
}
/**
* Sets the white balance. Changing the setting will release the
* auto-white balance lock. It is recommended not to change white
* balance and AWB lock at the same time.
*
* @param value new white balance.
* @see #getWhiteBalance()
* @see #setAutoWhiteBalanceLock(boolean)
*/
public void setWhiteBalance(String value) {
String oldValue = get(KEY_WHITE_BALANCE);
if (same(value, oldValue)) return;
set(KEY_WHITE_BALANCE, value);
set(KEY_AUTO_WHITEBALANCE_LOCK, FALSE);
}
/**
* Gets the supported white balance.
*
* @return a list of supported white balance. null if white balance
* setting is not supported.
* @see #getWhiteBalance()
*/
public List getSupportedWhiteBalance() {
String str = get(KEY_WHITE_BALANCE + SUPPORTED_VALUES_SUFFIX);
return split(str);
}
/**
* Gets the current color effect setting.
*
* @return current color effect. null if color effect
* setting is not supported.
* @see #EFFECT_NONE
* @see #EFFECT_MONO
* @see #EFFECT_NEGATIVE
* @see #EFFECT_SOLARIZE
* @see #EFFECT_SEPIA
* @see #EFFECT_POSTERIZE
* @see #EFFECT_WHITEBOARD
* @see #EFFECT_BLACKBOARD
* @see #EFFECT_AQUA
*/
public String getColorEffect() {
return get(KEY_EFFECT);
}
/**
* Sets the current color effect setting.
*
* @param value new color effect.
* @see #getColorEffect()
*/
public void setColorEffect(String value) {
set(KEY_EFFECT, value);
}
/**
* Gets the supported color effects.
*
* @return a list of supported color effects. null if color effect
* setting is not supported.
* @see #getColorEffect()
*/
public List getSupportedColorEffects() {
String str = get(KEY_EFFECT + SUPPORTED_VALUES_SUFFIX);
return split(str);
}
/**
* Gets the current antibanding setting.
*
* @return current antibanding. null if antibanding setting is not
* supported.
* @see #ANTIBANDING_AUTO
* @see #ANTIBANDING_50HZ
* @see #ANTIBANDING_60HZ
* @see #ANTIBANDING_OFF
*/
public String getAntibanding() {
return get(KEY_ANTIBANDING);
}
/**
* Sets the antibanding.
*
* @param antibanding new antibanding value.
* @see #getAntibanding()
*/
public void setAntibanding(String antibanding) {
set(KEY_ANTIBANDING, antibanding);
}
/**
* Gets the supported antibanding values.
*
* @return a list of supported antibanding values. null if antibanding
* setting is not supported.
* @see #getAntibanding()
*/
public List getSupportedAntibanding() {
String str = get(KEY_ANTIBANDING + SUPPORTED_VALUES_SUFFIX);
return split(str);
}
/**
* Gets the current scene mode setting.
*
* @return one of SCENE_MODE_XXX string constant. null if scene mode
* setting is not supported.
* @see #SCENE_MODE_AUTO
* @see #SCENE_MODE_ACTION
* @see #SCENE_MODE_PORTRAIT
* @see #SCENE_MODE_LANDSCAPE
* @see #SCENE_MODE_NIGHT
* @see #SCENE_MODE_NIGHT_PORTRAIT
* @see #SCENE_MODE_THEATRE
* @see #SCENE_MODE_BEACH
* @see #SCENE_MODE_SNOW
* @see #SCENE_MODE_SUNSET
* @see #SCENE_MODE_STEADYPHOTO
* @see #SCENE_MODE_FIREWORKS
* @see #SCENE_MODE_SPORTS
* @see #SCENE_MODE_PARTY
* @see #SCENE_MODE_CANDLELIGHT
* @see #SCENE_MODE_BARCODE
*/
public String getSceneMode() {
return get(KEY_SCENE_MODE);
}
/**
* Sets the scene mode. Changing scene mode may override other
* parameters (such as flash mode, focus mode, white balance). For
* example, suppose originally flash mode is on and supported flash
* modes are on/off. In night scene mode, both flash mode and supported
* flash mode may be changed to off. After setting scene mode,
* applications should call getParameters to know if some parameters are
* changed.
*
* @param value scene mode.
* @see #getSceneMode()
*/
public void setSceneMode(String value) {
set(KEY_SCENE_MODE, value);
}
/**
* Gets the supported scene modes.
*
* @return a list of supported scene modes. null if scene mode setting
* is not supported.
* @see #getSceneMode()
*/
public List getSupportedSceneModes() {
String str = get(KEY_SCENE_MODE + SUPPORTED_VALUES_SUFFIX);
return split(str);
}
/**
* Gets the current flash mode setting.
*
* @return current flash mode. null if flash mode setting is not
* supported.
* @see #FLASH_MODE_OFF
* @see #FLASH_MODE_AUTO
* @see #FLASH_MODE_ON
* @see #FLASH_MODE_RED_EYE
* @see #FLASH_MODE_TORCH
*/
public String getFlashMode() {
return get(KEY_FLASH_MODE);
}
/**
* Sets the flash mode.
*
* @param value flash mode.
* @see #getFlashMode()
*/
public void setFlashMode(String value) {
set(KEY_FLASH_MODE, value);
}
/**
* Gets the supported flash modes.
*
* @return a list of supported flash modes. null if flash mode setting
* is not supported.
* @see #getFlashMode()
*/
public List getSupportedFlashModes() {
String str = get(KEY_FLASH_MODE + SUPPORTED_VALUES_SUFFIX);
return split(str);
}
/**
* Gets the current focus mode setting.
*
* @return current focus mode. This method will always return a non-null
* value. Applications should call {@link
* #autoFocus(AutoFocusCallback)} to start the focus if focus
* mode is FOCUS_MODE_AUTO or FOCUS_MODE_MACRO.
* @see #FOCUS_MODE_AUTO
* @see #FOCUS_MODE_INFINITY
* @see #FOCUS_MODE_MACRO
* @see #FOCUS_MODE_FIXED
* @see #FOCUS_MODE_EDOF
* @see #FOCUS_MODE_CONTINUOUS_VIDEO
*/
public String getFocusMode() {
return get(KEY_FOCUS_MODE);
}
/**
* Sets the focus mode.
*
* @param value focus mode.
* @see #getFocusMode()
*/
public void setFocusMode(String value) {
set(KEY_FOCUS_MODE, value);
}
/**
* Gets the supported focus modes.
*
* @return a list of supported focus modes. This method will always
* return a list with at least one element.
* @see #getFocusMode()
*/
public List getSupportedFocusModes() {
String str = get(KEY_FOCUS_MODE + SUPPORTED_VALUES_SUFFIX);
return split(str);
}
/**
* Gets the focal length (in millimeter) of the camera.
*
* @return the focal length. This method will always return a valid
* value.
*/
public float getFocalLength() {
return Float.parseFloat(get(KEY_FOCAL_LENGTH));
}
/**
* Gets the horizontal angle of view in degrees.
*
* @return horizontal angle of view. This method will always return a
* valid value.
*/
public float getHorizontalViewAngle() {
return Float.parseFloat(get(KEY_HORIZONTAL_VIEW_ANGLE));
}
/**
* Gets the vertical angle of view in degrees.
*
* @return vertical angle of view. This method will always return a
* valid value.
*/
public float getVerticalViewAngle() {
return Float.parseFloat(get(KEY_VERTICAL_VIEW_ANGLE));
}
/**
* Gets the current exposure compensation index.
*
* @return current exposure compensation index. The range is {@link
* #getMinExposureCompensation} to {@link
* #getMaxExposureCompensation}. 0 means exposure is not
* adjusted.
*/
public int getExposureCompensation() {
return getInt(KEY_EXPOSURE_COMPENSATION, 0);
}
/**
* Sets the exposure compensation index.
*
* @param value exposure compensation index. The valid value range is
* from {@link #getMinExposureCompensation} (inclusive) to {@link
* #getMaxExposureCompensation} (inclusive). 0 means exposure is
* not adjusted. Application should call
* getMinExposureCompensation and getMaxExposureCompensation to
* know if exposure compensation is supported.
*/
public void setExposureCompensation(int value) {
set(KEY_EXPOSURE_COMPENSATION, value);
}
/**
* Gets the maximum exposure compensation index.
*
* @return maximum exposure compensation index (>=0). If both this
* method and {@link #getMinExposureCompensation} return 0,
* exposure compensation is not supported.
*/
public int getMaxExposureCompensation() {
return getInt(KEY_MAX_EXPOSURE_COMPENSATION, 0);
}
/**
* Gets the minimum exposure compensation index.
*
* @return minimum exposure compensation index (<=0). If both this
* method and {@link #getMaxExposureCompensation} return 0,
* exposure compensation is not supported.
*/
public int getMinExposureCompensation() {
return getInt(KEY_MIN_EXPOSURE_COMPENSATION, 0);
}
/**
* Gets the exposure compensation step.
*
* @return exposure compensation step. Applications can get EV by
* multiplying the exposure compensation index and step. Ex: if
* exposure compensation index is -6 and step is 0.333333333, EV
* is -2.
*/
public float getExposureCompensationStep() {
return getFloat(KEY_EXPOSURE_COMPENSATION_STEP, 0);
}
/**
* Sets the auto-exposure lock state. Applications should check
* {@link #isAutoExposureLockSupported} before using this method.
*
* If set to true, the camera auto-exposure routine will immediately
* pause until the lock is set to false. Exposure compensation settings
* changes will still take effect while auto-exposure is locked.
*
* If auto-exposure is already locked, setting this to true again has
* no effect (the driver will not recalculate exposure values).
*
* Stopping preview with {@link #stopPreview()}, or triggering still
* image capture with {@link #takePicture(Camera.ShutterCallback,
* Camera.PictureCallback, Camera.PictureCallback)}, will not change the
* lock.
*
* Exposure compensation, auto-exposure lock, and auto-white balance
* lock can be used to capture an exposure-bracketed burst of images,
* for example.
*
* Auto-exposure state, including the lock state, will not be
* maintained after camera {@link #release()} is called. Locking
* auto-exposure after {@link #open()} but before the first call to
* {@link #startPreview()} will not allow the auto-exposure routine to
* run at all, and may result in severely over- or under-exposed
* images.
*
* @param toggle new state of the auto-exposure lock. True means that
* auto-exposure is locked, false means that the auto-exposure
* routine is free to run normally.
*
* @see #getAutoExposureLock()
*/
public void setAutoExposureLock(boolean toggle) {
set(KEY_AUTO_EXPOSURE_LOCK, toggle ? TRUE : FALSE);
}
/**
* Gets the state of the auto-exposure lock. Applications should check
* {@link #isAutoExposureLockSupported} before using this method. See
* {@link #setAutoExposureLock} for details about the lock.
*
* @return State of the auto-exposure lock. Returns true if
* auto-exposure is currently locked, and false otherwise.
*
* @see #setAutoExposureLock(boolean)
*
*/
public boolean getAutoExposureLock() {
String str = get(KEY_AUTO_EXPOSURE_LOCK);
return TRUE.equals(str);
}
/**
* Returns true if auto-exposure locking is supported. Applications
* should call this before trying to lock auto-exposure. See
* {@link #setAutoExposureLock} for details about the lock.
*
* @return true if auto-exposure lock is supported.
* @see #setAutoExposureLock(boolean)
*
*/
public boolean isAutoExposureLockSupported() {
String str = get(KEY_AUTO_EXPOSURE_LOCK_SUPPORTED);
return TRUE.equals(str);
}
/**
* Sets the auto-white balance lock state. Applications should check
* {@link #isAutoWhiteBalanceLockSupported} before using this
* method.
*
* If set to true, the camera auto-white balance routine will
* immediately pause until the lock is set to false.
*
* If auto-white balance is already locked, setting this to true
* again has no effect (the driver will not recalculate white balance
* values).
*
* Stopping preview with {@link #stopPreview()}, or triggering still
* image capture with {@link #takePicture(Camera.ShutterCallback,
* Camera.PictureCallback, Camera.PictureCallback)}, will not change the
* the lock.
*
* Changing the white balance mode with {@link #setWhiteBalance}
* will release the auto-white balance lock if it is set.
*
* Exposure compensation, AE lock, and AWB lock can be used to
* capture an exposure-bracketed burst of images, for example.
* Auto-white balance state, including the lock state, will not be
* maintained after camera {@link #release()} is called. Locking
* auto-white balance after {@link #open()} but before the first call to
* {@link #startPreview()} will not allow the auto-white balance routine
* to run at all, and may result in severely incorrect color in captured
* images.
*
* @param toggle new state of the auto-white balance lock. True means
* that auto-white balance is locked, false means that the
* auto-white balance routine is free to run normally.
*
* @see #getAutoWhiteBalanceLock()
* @see #setWhiteBalance(String)
*/
public void setAutoWhiteBalanceLock(boolean toggle) {
set(KEY_AUTO_WHITEBALANCE_LOCK, toggle ? TRUE : FALSE);
}
/**
* Gets the state of the auto-white balance lock. Applications should
* check {@link #isAutoWhiteBalanceLockSupported} before using this
* method. See {@link #setAutoWhiteBalanceLock} for details about the
* lock.
*
* @return State of the auto-white balance lock. Returns true if
* auto-white balance is currently locked, and false
* otherwise.
*
* @see #setAutoWhiteBalanceLock(boolean)
*
*/
public boolean getAutoWhiteBalanceLock() {
String str = get(KEY_AUTO_WHITEBALANCE_LOCK);
return TRUE.equals(str);
}
/**
* Returns true if auto-white balance locking is supported. Applications
* should call this before trying to lock auto-white balance. See
* {@link #setAutoWhiteBalanceLock} for details about the lock.
*
* @return true if auto-white balance lock is supported.
* @see #setAutoWhiteBalanceLock(boolean)
*
*/
public boolean isAutoWhiteBalanceLockSupported() {
String str = get(KEY_AUTO_WHITEBALANCE_LOCK_SUPPORTED);
return TRUE.equals(str);
}
/**
* Gets current zoom value. This also works when smooth zoom is in
* progress. Applications should check {@link #isZoomSupported} before
* using this method.
*
* @return the current zoom value. The range is 0 to {@link
* #getMaxZoom}. 0 means the camera is not zoomed.
*/
public int getZoom() {
return getInt(KEY_ZOOM, 0);
}
/**
* Sets current zoom value. If the camera is zoomed (value > 0), the
* actual picture size may be smaller than picture size setting.
* Applications can check the actual picture size after picture is
* returned from {@link PictureCallback}. The preview size remains the
* same in zoom. Applications should check {@link #isZoomSupported}
* before using this method.
*
* @param value zoom value. The valid range is 0 to {@link #getMaxZoom}.
*/
public void setZoom(int value) {
set(KEY_ZOOM, value);
}
/**
* Returns true if zoom is supported. Applications should call this
* before using other zoom methods.
*
* @return true if zoom is supported.
*/
public boolean isZoomSupported() {
String str = get(KEY_ZOOM_SUPPORTED);
return TRUE.equals(str);
}
/**
* Gets the maximum zoom value allowed for snapshot. This is the maximum
* value that applications can set to {@link #setZoom(int)}.
* Applications should call {@link #isZoomSupported} before using this
* method. This value may change in different preview size. Applications
* should call this again after setting preview size.
*
* @return the maximum zoom value supported by the camera.
*/
public int getMaxZoom() {
return getInt(KEY_MAX_ZOOM, 0);
}
/**
* Gets the zoom ratios of all zoom values. Applications should check
* {@link #isZoomSupported} before using this method.
*
* @return the zoom ratios in 1/100 increments. Ex: a zoom of 3.2x is
* returned as 320. The number of elements is {@link
* #getMaxZoom} + 1. The list is sorted from small to large. The
* first element is always 100. The last element is the zoom
* ratio of the maximum zoom value.
*/
public List getZoomRatios() {
return splitInt(get(KEY_ZOOM_RATIOS));
}
/**
* Returns true if smooth zoom is supported. Applications should call
* this before using other smooth zoom methods.
*
* @return true if smooth zoom is supported.
*/
public boolean isSmoothZoomSupported() {
String str = get(KEY_SMOOTH_ZOOM_SUPPORTED);
return TRUE.equals(str);
}
/**
* Gets the distances from the camera to where an object appears to be
* in focus. The object is sharpest at the optimal focus distance. The
* depth of field is the far focus distance minus near focus distance.
*
* Focus distances may change after calling {@link
* #autoFocus(AutoFocusCallback)}, {@link #cancelAutoFocus}, or {@link
* #startPreview()}. Applications can call {@link #getParameters()}
* and this method anytime to get the latest focus distances. If the
* focus mode is FOCUS_MODE_CONTINUOUS_VIDEO, focus distances may change
* from time to time.
*
* This method is intended to estimate the distance between the camera
* and the subject. After autofocus, the subject distance may be within
* near and far focus distance. However, the precision depends on the
* camera hardware, autofocus algorithm, the focus area, and the scene.
* The error can be large and it should be only used as a reference.
*
* Far focus distance >= optimal focus distance >= near focus distance.
* If the focus distance is infinity, the value will be
* {@code Float.POSITIVE_INFINITY}.
*
* @param output focus distances in meters. output must be a float
* array with three elements. Near focus distance, optimal focus
* distance, and far focus distance will be filled in the array.
* @see #FOCUS_DISTANCE_NEAR_INDEX
* @see #FOCUS_DISTANCE_OPTIMAL_INDEX
* @see #FOCUS_DISTANCE_FAR_INDEX
*/
public void getFocusDistances(float[] output) {
if (output == null || output.length != 3) {
throw new IllegalArgumentException(
"output must be a float array with three elements.");
}
splitFloat(get(KEY_FOCUS_DISTANCES), output);
}
/**
* Gets the maximum number of focus areas supported. This is the maximum
* length of the list in {@link #setFocusAreas(List)} and
* {@link #getFocusAreas()}.
*
* @return the maximum number of focus areas supported by the camera.
* @see #getFocusAreas()
*/
public int getMaxNumFocusAreas() {
return getInt(KEY_MAX_NUM_FOCUS_AREAS, 0);
}
/**
* Gets the current focus areas. Camera driver uses the areas to decide
* focus.
*
* Before using this API or {@link #setFocusAreas(List)}, apps should
* call {@link #getMaxNumFocusAreas()} to know the maximum number of
* focus areas first. If the value is 0, focus area is not supported.
*
* Each focus area is a rectangle with specified weight. The direction
* is relative to the sensor orientation, that is, what the sensor sees.
* The direction is not affected by the rotation or mirroring of
* {@link #setDisplayOrientation(int)}. Coordinates of the rectangle
* range from -1000 to 1000. (-1000, -1000) is the upper left point.
* (1000, 1000) is the lower right point. The width and height of focus
* areas cannot be 0 or negative.
*
* The weight must range from 1 to 1000. The weight should be
* interpreted as a per-pixel weight - all pixels in the area have the
* specified weight. This means a small area with the same weight as a
* larger area will have less influence on the focusing than the larger
* area. Focus areas can partially overlap and the driver will add the
* weights in the overlap region.
*
* A special case of a {@code null} focus area list means the driver is
* free to select focus targets as it wants. For example, the driver may
* use more signals to select focus areas and change them
* dynamically. Apps can set the focus area list to {@code null} if they
* want the driver to completely control focusing.
*
* Focus areas are relative to the current field of view
* ({@link #getZoom()}). No matter what the zoom level is, (-1000,-1000)
* represents the top of the currently visible camera frame. The focus
* area cannot be set to be outside the current field of view, even
* when using zoom.
*
* Focus area only has effect if the current focus mode is
* {@link #FOCUS_MODE_AUTO}, {@link #FOCUS_MODE_MACRO},
* {@link #FOCUS_MODE_CONTINUOUS_VIDEO}, or
* {@link #FOCUS_MODE_CONTINUOUS_PICTURE}.
*
* @return a list of current focus areas
*/
public List getFocusAreas() {
return splitArea(get(KEY_FOCUS_AREAS));
}
/**
* Sets focus areas. See {@link #getFocusAreas()} for documentation.
*
* @param focusAreas the focus areas
* @see #getFocusAreas()
*/
public void setFocusAreas(List focusAreas) {
set(KEY_FOCUS_AREAS, focusAreas);
}
/**
* Gets the maximum number of metering areas supported. This is the
* maximum length of the list in {@link #setMeteringAreas(List)} and
* {@link #getMeteringAreas()}.
*
* @return the maximum number of metering areas supported by the camera.
* @see #getMeteringAreas()
*/
public int getMaxNumMeteringAreas() {
return getInt(KEY_MAX_NUM_METERING_AREAS, 0);
}
/**
* Gets the current metering areas. Camera driver uses these areas to
* decide exposure.
*
* Before using this API or {@link #setMeteringAreas(List)}, apps should
* call {@link #getMaxNumMeteringAreas()} to know the maximum number of
* metering areas first. If the value is 0, metering area is not
* supported.
*
* Each metering area is a rectangle with specified weight. The
* direction is relative to the sensor orientation, that is, what the
* sensor sees. The direction is not affected by the rotation or
* mirroring of {@link #setDisplayOrientation(int)}. Coordinates of the
* rectangle range from -1000 to 1000. (-1000, -1000) is the upper left
* point. (1000, 1000) is the lower right point. The width and height of
* metering areas cannot be 0 or negative.
*
* The weight must range from 1 to 1000, and represents a weight for
* every pixel in the area. This means that a large metering area with
* the same weight as a smaller area will have more effect in the
* metering result. Metering areas can partially overlap and the driver
* will add the weights in the overlap region.
*
* A special case of a {@code null} metering area list means the driver
* is free to meter as it chooses. For example, the driver may use more
* signals to select metering areas and change them dynamically. Apps
* can set the metering area list to {@code null} if they want the
* driver to completely control metering.
*
* Metering areas are relative to the current field of view
* ({@link #getZoom()}). No matter what the zoom level is, (-1000,-1000)
* represents the top of the currently visible camera frame. The
* metering area cannot be set to be outside the current field of view,
* even when using zoom.
*
* No matter what metering areas are, the final exposure are compensated
* by {@link #setExposureCompensation(int)}.
*
* @return a list of current metering areas
*/
public List getMeteringAreas() {
return splitArea(get(KEY_METERING_AREAS));
}
/**
* Sets metering areas. See {@link #getMeteringAreas()} for
* documentation.
*
* @param meteringAreas the metering areas
* @see #getMeteringAreas()
*/
public void setMeteringAreas(List meteringAreas) {
set(KEY_METERING_AREAS, meteringAreas);
}
/**
* Gets the maximum number of detected faces supported. This is the
* maximum length of the list returned from {@link FaceDetectionListener}.
* If the return value is 0, face detection of the specified type is not
* supported.
*
* @return the maximum number of detected face supported by the camera.
* @see #startFaceDetection()
*/
public int getMaxNumDetectedFaces() {
return getInt(KEY_MAX_NUM_DETECTED_FACES_HW, 0);
}
/**
* Sets recording mode hint. This tells the camera that the intent of
* the application is to record videos {@link
* android.media.MediaRecorder#start()}, not to take still pictures
* {@link #takePicture(Camera.ShutterCallback, Camera.PictureCallback,
* Camera.PictureCallback, Camera.PictureCallback)}. Using this hint can
* allow MediaRecorder.start() to start faster or with fewer glitches on
* output. This should be called before starting preview for the best
* result, but can be changed while the preview is active. The default
* value is false.
*
* The app can still call takePicture() when the hint is true or call
* MediaRecorder.start() when the hint is false. But the performance may
* be worse.
*
* @param hint true if the apps intend to record videos using
* {@link android.media.MediaRecorder}.
*/
public void setRecordingHint(boolean hint) {
set(KEY_RECORDING_HINT, hint ? TRUE : FALSE);
}
/**
* Returns true if video snapshot is supported. That is, applications
* can call {@link #takePicture(Camera.ShutterCallback,
* Camera.PictureCallback, Camera.PictureCallback,
* Camera.PictureCallback)} during recording. Applications do not need
* to call {@link #startPreview()} after taking a picture. The preview
* will be still active. Other than that, taking a picture during
* recording is identical to taking a picture normally. All settings and
* methods related to takePicture work identically. Ex:
* {@link #getPictureSize()}, {@link #getSupportedPictureSizes()},
* {@link #setJpegQuality(int)}, {@link #setRotation(int)}, and etc. The
* picture will have an EXIF header. {@link #FLASH_MODE_AUTO} and
* {@link #FLASH_MODE_ON} also still work, but the video will record the
* flash.
*
* Applications can set shutter callback as null to avoid the shutter
* sound. It is also recommended to set raw picture and post view
* callbacks to null to avoid the interrupt of preview display.
*
* Field-of-view of the recorded video may be different from that of the
* captured pictures. The maximum size of a video snapshot may be
* smaller than that for regular still captures. If the current picture
* size is set higher than can be supported by video snapshot, the
* picture will be captured at the maximum supported size instead.
*
* @return true if video snapshot is supported.
*/
public boolean isVideoSnapshotSupported() {
String str = get(KEY_VIDEO_SNAPSHOT_SUPPORTED);
return TRUE.equals(str);
}
/**
* Enables and disables video stabilization. Use
* {@link #isVideoStabilizationSupported} to determine if calling this
* method is valid.
*
* Video stabilization reduces the shaking due to the motion of the
* camera in both the preview stream and in recorded videos, including
* data received from the preview callback. It does not reduce motion
* blur in images captured with
* {@link Camera#takePicture takePicture}.
*
* Video stabilization can be enabled and disabled while preview or
* recording is active, but toggling it may cause a jump in the video
* stream that may be undesirable in a recorded video.
*
* @param toggle Set to true to enable video stabilization, and false to
* disable video stabilization.
* @see #isVideoStabilizationSupported()
* @see #getVideoStabilization()
*/
public void setVideoStabilization(boolean toggle) {
set(KEY_VIDEO_STABILIZATION, toggle ? TRUE : FALSE);
}
/**
* Get the current state of video stabilization. See
* {@link #setVideoStabilization} for details of video stabilization.
*
* @return true if video stabilization is enabled
* @see #isVideoStabilizationSupported()
* @see #setVideoStabilization(boolean)
*/
public boolean getVideoStabilization() {
String str = get(KEY_VIDEO_STABILIZATION);
return TRUE.equals(str);
}
/**
* Returns true if video stabilization is supported. See
* {@link #setVideoStabilization} for details of video stabilization.
*
* @return true if video stabilization is supported
* @see #setVideoStabilization(boolean)
* @see #getVideoStabilization()
*/
public boolean isVideoStabilizationSupported() {
String str = get(KEY_VIDEO_STABILIZATION_SUPPORTED);
return TRUE.equals(str);
}
// Splits a comma delimited string to an ArrayList of String.
// Return null if the passing string is null or the size is 0.
private ArrayList split(String str) {
if (str == null) return null;
TextUtils.StringSplitter splitter = new TextUtils.SimpleStringSplitter(',');
splitter.setString(str);
ArrayList substrings = new ArrayList();
for (String s : splitter) {
substrings.add(s);
}
return substrings;
}
// Splits a comma delimited string to an ArrayList of Integer.
// Return null if the passing string is null or the size is 0.
private ArrayList splitInt(String str) {
if (str == null) return null;
TextUtils.StringSplitter splitter = new TextUtils.SimpleStringSplitter(',');
splitter.setString(str);
ArrayList substrings = new ArrayList();
for (String s : splitter) {
substrings.add(Integer.parseInt(s));
}
if (substrings.size() == 0) return null;
return substrings;
}
private void splitInt(String str, int[] output) {
if (str == null) return;
TextUtils.StringSplitter splitter = new TextUtils.SimpleStringSplitter(',');
splitter.setString(str);
int index = 0;
for (String s : splitter) {
output[index++] = Integer.parseInt(s);
}
}
// Splits a comma delimited string to an ArrayList of Float.
private void splitFloat(String str, float[] output) {
if (str == null) return;
TextUtils.StringSplitter splitter = new TextUtils.SimpleStringSplitter(',');
splitter.setString(str);
int index = 0;
for (String s : splitter) {
output[index++] = Float.parseFloat(s);
}
}
// Returns the value of a float parameter.
private float getFloat(String key, float defaultValue) {
try {
return Float.parseFloat(mMap.get(key));
} catch (NumberFormatException ex) {
return defaultValue;
}
}
// Returns the value of a integer parameter.
private int getInt(String key, int defaultValue) {
try {
return Integer.parseInt(mMap.get(key));
} catch (NumberFormatException ex) {
return defaultValue;
}
}
// Splits a comma delimited string to an ArrayList of Size.
// Return null if the passing string is null or the size is 0.
private ArrayList splitSize(String str) {
if (str == null) return null;
TextUtils.StringSplitter splitter = new TextUtils.SimpleStringSplitter(',');
splitter.setString(str);
ArrayList sizeList = new ArrayList();
for (String s : splitter) {
Size size = strToSize(s);
if (size != null) sizeList.add(size);
}
if (sizeList.size() == 0) return null;
return sizeList;
}
// Parses a string (ex: "480x320") to Size object.
// Return null if the passing string is null.
private Size strToSize(String str) {
if (str == null) return null;
int pos = str.indexOf('x');
if (pos != -1) {
String width = str.substring(0, pos);
String height = str.substring(pos + 1);
return new Size(Integer.parseInt(width),
Integer.parseInt(height));
}
Log.e(TAG, "Invalid size parameter string=" + str);
return null;
}
// Splits a comma delimited string to an ArrayList of int array.
// Example string: "(10000,26623),(10000,30000)". Return null if the
// passing string is null or the size is 0.
private ArrayList<int[]> splitRange(String str) {
if (str == null || str.charAt(0) != '('
|| str.charAt(str.length() - 1) != ')') {
Log.e(TAG, "Invalid range list string=" + str);
return null;
}
ArrayList<int[]> rangeList = new ArrayList<int[]>();
int endIndex, fromIndex = 1;
do {
int[] range = new int[2];
endIndex = str.indexOf("),(", fromIndex);
if (endIndex == -1) endIndex = str.length() - 1;
splitInt(str.substring(fromIndex, endIndex), range);
rangeList.add(range);
fromIndex = endIndex + 3;
} while (endIndex != str.length() - 1);
if (rangeList.size() == 0) return null;
return rangeList;
}
// Splits a comma delimited string to an ArrayList of Area objects.
// Example string: "(-10,-10,0,0,300),(0,0,10,10,700)". Return null if
// the passing string is null or the size is 0 or (0,0,0,0,0).
private ArrayList splitArea(String str) {
if (str == null || str.charAt(0) != '('
|| str.charAt(str.length() - 1) != ')') {
Log.e(TAG, "Invalid area string=" + str);
return null;
}
ArrayList result = new ArrayList();
int endIndex, fromIndex = 1;
int[] array = new int[5];
do {
endIndex = str.indexOf("),(", fromIndex);
if (endIndex == -1) endIndex = str.length() - 1;
splitInt(str.substring(fromIndex, endIndex), array);
Rect rect = new Rect(array[0], array[1], array[2], array[3]);
result.add(new Area(rect, array[4]));
fromIndex = endIndex + 3;
} while (endIndex != str.length() - 1);
if (result.size() == 0) return null;
if (result.size() == 1) {
Area area = result.get(0);
Rect rect = area.rect;
if (rect.left == 0 && rect.top == 0 && rect.right == 0
&& rect.bottom == 0 && area.weight == 0) {
return null;
}
}
return result;
}
private boolean same(String s1, String s2) {
if (s1 == null && s2 == null) return true;
if (s1 != null && s1.equals(s2)) return true;
return false;
}
};
}