android_驱动_qcom_【高通SDM660平台】(7) --- Camera onPreview 代码流程
【高通SDM660平台】Camera onPreview 代码流程
- 一、Camera onPreview 流程
- 1. [ Framework ] Camera.java
- 2. [ JNI ] android_hardware_Camera.cpp
- 3. [ Native ] Camera.cpp
- 4. [ Native ] CameraClient.cpp
- 5. [ Hardware ] CameraClient.cpp
- 6. [ Hardware ] camera_device_t
- 7. [ Hardware ] QCamera2HWI.cpp
- 8. [ HWI ] QCameraStateMachine.cpp
- 9. [ HWI ] procEvtPreviewStoppedState
- 9.1 addChannel(QCAMERA_CH_TYPE_PREVIEW)
- 10. [ HWI ] procEvtPreviewReadyState
- 10. [ HWI ] QCamera2HardwareInterface::startPreview()
- 11. [ HWI ] QCameraChannel
- 12. mm_camera_ops 定义
- 13. [ HWI ] QCameraStream
- 13.1 mStreams[i]->setBundleInfo()
- 13.2 mStreams[i]->start()
- 13.2.1 Camera 数据处理线程 及 QCameraStream的 Callbak 调用
- 13.3 m_camOps->start_channel(m_camHandle, m_handle)
- 13.4 mStreams[i]->cond_signal()
- 13.5 QCameraStream 总结
- 14. CAM_STREAM_TYPE_METADATA 的 Callback 函数metadata_stream_cb_routine()
- 15. CAM_STREAM_TYPE_PREVIEW 的 Callback 函数 preview_stream_cb_routine()
- 16. CAM_STREAM_TYPE_RAW 的 Callback 函数 preview_raw_stream_cb_routine()
- 17. mm_channel_start => mm_stream_dispatch_app_data() 线程函数解析"CAM_StrmAppData"
- 18. Data Stream Call back
《【高通SDM660平台】(1) — Camera 驱动 Bringup Guide》
《【高通SDM660平台】(2) — Camera Kernel 驱动层代码逻辑分析》
《【高通SDM660平台】(3) — Camera V4L2 驱动层分析 》
《【高通SDM660平台】(4) — Camera Init 初始化流程 》
《【高通SDM660平台】(5) — Camera Open 流程》
《【高通SDM660平台】(6) — Camera getParameters 及 setParameters 流程》
《【高通SDM660平台】(7) — Camera onPreview 代码流程》
《【高通SDM660平台】(8) — Camera MetaData介绍》
《【高通SDM660平台 Android 10.0】(9) — Qcom Camera Daemon 代码分析》
《【高通SDM660平台 Android 10.0】(10) — Camera Sensor lib 与 Kernel Camera Probe 代码分析》
《【高通SDM660平台】Camera Capture 流程》
《【高通SDM660平台】Camera mm-qcamera-app 代码分析》
一、Camera onPreview 流程
1. [ Framework ] Camera.java
@ frameworks/base/core/java/android/hardware/Camera.java @Deprecated public class Camera { private static final String TAG = "Camera";public native final void startPreview();
}
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2. [ JNI ] android_hardware_Camera.cpp
可以看出，代码是获取 native 层Camera 对象，调用 Camera::startPreview() 方法
@ frameworks/base/core/jni/android_hardware_Camera.cpp static void android_hardware_Camera_startPreview(JNIEnv *env, jobject thiz) { ALOGV("startPreview"); sp<Camera> camera = get_native_camera(env, thiz, NULL);if (camera->startPreview() != NO_ERROR) { jniThrowRuntimeException(env, "startPreview failed"); return; }
}
//-------------------------------------------------
static const JNINativeMethod camMethods[] = {
{ “startPreview”, “()V”, (void *)android_hardware_Camera_startPreview },
}
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3. [ Native ] Camera.cpp
@ frameworks/av/camera/Camera.cpp
// start preview mode
status_t Camera::startPreview()
{
ALOGV("startPreview");
sp <::android::hardware::ICamera> c = mCamera;
if (c == 0) return NO_INIT;
return c->startPreview();
========>
@ frameworks/av/camera/ICamera.cpp
status_t startPreview()
{
ALOGV("startPreview");
Parcel data, reply;
data.writeInterfaceToken(ICamera::getInterfaceDescriptor());
remote()->transact(START_PREVIEW, data, &reply);
return reply.readInt32();
}
}
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在 ICamera.cpp 代理对像中远程调用BnCamera的onTransact() 方法
@ frameworks/av/camera/ICamera.cpp
status_t BnCamera::onTransact( uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags)
{
switch(code) {
case START_PREVIEW: {
ALOGV("START_PREVIEW");
CHECK_INTERFACE(ICamera, data, reply);
reply->writeInt32(startPreview());
return NO_ERROR;
} break;
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可以看出 ，调用的是BnCamera 的中的 startPreview() 方法，但实际上 BnCamera 并没有 实现startPreview() 方法，它是继承于 ICamera 的虚方法。
因此，startPreview() 是由 BnCamera 的子类来实现。
@ frameworks/av/services/camera/libcameraservice/CameraService.h
class CameraService :
public BinderService<CameraService>,
public ::android::hardware::BnCameraService,
public IBinder::DeathRecipient,
public camera_module_callbacks_t
{
class Client : public hardware::BnCamera, public BasicClient
{
public:
virtual status_t startPreview() = 0;
virtual void stopPreview() = 0;
}
}
@ frameworks/av/services/camera/libcameraservice/api1/CameraClient.h
class CameraClient : public CameraService::Client
{
public:
virtual status_t startPreview();
virtual void stopPreview();
}
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可以看出，CameraService 的内部类 Client 是继承了 BnCamera 的 startPreview() 方法，
接着，CameraClient 继承了 CameraService::Client ，最终 startPreview() 方法 是由 CameraClient 来实现了
4. [ Native ] CameraClient.cpp
@ frameworks/av/services/camera/libcameraservice/api1/CameraClient.cpp
// start preview mode
status_t CameraClient::startPreview() {
LOG1("startPreview (pid %d)", getCallingPid());
// 开始预览
return startCameraMode(CAMERA_PREVIEW_MODE);
}
// start preview or recording
status_t CameraClient::startCameraMode(camera_mode mode) {
LOG1(“startCameraMode(%d)”, mode);
switch(mode) {
case CAMERA_PREVIEW_MODE:
return startPreviewMode();
case CAMERA_RECORDING_MODE:
return startRecordingMode();
}
}
status_t CameraClient::startPreviewMode() {
LOG1(“startPreviewMode”);
if (mPreviewWindow != 0) {
//根据新的参数，设置所有缓冲区的显示
mHardware->setPreviewScalingMode( NATIVE_WINDOW_SCALING_MODE_SCALE_TO_WINDOW);
mHardware->setPreviewTransform(mOrientation);
}
//设置预览窗口
mHardware->setPreviewWindow(mPreviewWindow);
result = mHardware->startPreview();
if (result == NO_ERROR) {
mCameraService->updateProxyDeviceState( ICameraServiceProxy::CAMERA_STATE_ACTIVE,
String8::format("%d", mCameraId));
}
return result;
}
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5. [ Hardware ] CameraClient.cpp
mHardware 对像实现如下， sp
可知，mHardware->setPreviewWindow(mPreviewWindow); 实现如下：
@ frameworks/av/services/camera/libcameraservice/device1/CameraHardwareInterface.h
class CameraHardwareInterface : public virtual RefBase {
public:
/*** Start preview mode. */
status_t startPreview()
{
ALOGV("%s(%s)", FUNCTION, mName.string());
if (mDevice->ops->start_preview)
return mDevice->ops->start_preview(mDevice);
return INVALID_OPERATION;
}
}
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6. [ Hardware ] camera_device_t
mDevice 定义为 camera_device_t *mDevice;
camera_device_t定义在：
@ hardware/libhardware/include/hardware/camera.h
struct camera_device;
typedef struct camera_device_ops {
/**
* Start preview mode.
/
int (start_preview)(struct camera_device *);
}camera_device_ops_t;
typedef struct camera_device {
/**
* camera_device.common.version must be in the range
* HARDWARE_DEVICE_API_VERSION(0,0)-(1,FF). CAMERA_DEVICE_API_VERSION_1_0 is
* recommended.
/
hw_device_t common;
camera_device_ops_t ops;
void *priv;
} camera_device_t;
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@ hardware/qcom/camera/QCamera2/HAL/QCamera2HWI.cpp
camera_device_ops_t QCamera2HardwareInterface::mCameraOps = {
.start_preview = QCamera2HardwareInterface::start_preview,
.stop_preview = QCamera2HardwareInterface::stop_preview,
}
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7. [ Hardware ] QCamera2HWI.cpp
通过 processAPI() 往底层下发 QCAMERA_SM_EVT_START_PREVIEW 事件
@ hardware/qcom/camera/QCamera2/HAL/QCamera2HWI.cpp
int QCamera2HardwareInterface::start_preview(struct camera_device *device)
{
KPI_ATRACE_CAMSCOPE_CALL(CAMSCOPE_HAL1_START_PREVIEW);
QCamera2HardwareInterface *hw = reinterpret_cast<QCamera2HardwareInterface *>(device->priv);
LOGI("[KPI Perf]: E PROFILE_START_PREVIEW camera id %d", hw->getCameraId());
qcamera_sm_evt_enum_t evt = QCAMERA_SM_EVT_START_PREVIEW;
uint32_t cam_type = CAM_TYPE_MAIN;
if (hw->isDualCamera()) {
cam_type = MM_CAMERA_DUAL_CAM;
}
if (hw->isNoDisplayMode(cam_type)) {
evt = QCAMERA_SM_EVT_START_NODISPLAY_PREVIEW;
}
ret = hw->processAPI(evt, NULL);
=========>
@ hardware/qcom/camera/QCamera2/HAL/QCamera2HWI.cpp
QCamera2HardwareInterface *hw = reinterpret_cast<QCamera2HardwareInterface *>(device->priv);
int QCamera2HardwareInterface::processAPI(qcamera_sm_evt_enum_t api, void *api_payload)
{
ret = m_stateMachine.procAPI(api, api_payload);
}
if (ret == NO_ERROR) {
hw->waitAPIResult(evt, &apiResult);
ret = apiResult.status;
}
hw->unlockAPI();
LOGI("[KPI Perf]: X ret = %d", ret);
return ret;
}
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经过层层调用，最终跑到了 QCameraStateMachine::procAPI() 中， evt=QCAMERA_SM_EVT_START_PREVIEW
将消息，保存在 class QCameraQueue 中。
node 中包括： QCAMERA_SM_EVT_START_PREVIEW 和 QCAMERA_SM_CMD_TYPE_API 两个消息
@ hardware/qcom/camera/QCamera2/HAL/QCameraStateMachine.cpp
QCameraStateMachine m_stateMachine;
int32_t QCameraStateMachine::procAPI(qcamera_sm_evt_enum_t evt, void api_payload)
{
qcamera_sm_cmd_t node = (qcamera_sm_cmd_t *)malloc(sizeof(qcamera_sm_cmd_t));
memset(node, 0, sizeof(qcamera_sm_cmd_t));
node->cmd = QCAMERA_SM_CMD_TYPE_API;
node->evt = evt;
node->evt_payload = api_payload;
if (api_queue.enqueue((void *)node)) {
cam_sem_post(&cmd_sem);
return NO_ERROR;
}
}
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在QCameraQueue::enqueue() 中添加队列
@ hardware/qcom/camera/QCamera2/util/QCameraQueue.cpp bool QCameraQueue::enqueue(void *data) { bool rc; camera_q_node *node = (camera_q_node *)malloc(sizeof(camera_q_node));memset(node, 0, sizeof(camera_q_node)); node->data = data; if (m_active) { cam_list_add_tail_node(&node->list, &m_head.list); m_size++; rc = true; } return rc;
}
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8. [ HWI ] QCameraStateMachine.cpp
在QCameraStateMachine 中创建了一个线程用 于处理evt 事件
@ hardware/qcom/camera/QCamera2/HAL/QCameraStateMachine.cpp
QCameraStateMachine::QCameraStateMachine(QCamera2HardwareInterface *ctrl) :
api_queue(),
evt_queue()
{
pthread_create(&cmd_pid, NULL,smEvtProcRoutine,this);
pthread_setname_np(cmd_pid, “CAM_stMachine”);
}
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在线程 *QCameraStateMachine::smEvtProcRoutine() 中，
因为下发的是 QCAMERA_SM_EVT_START_PREVIEW 和 QCAMERA_SM_CMD_TYPE_API 两个消息 ，
可知跑 case QCAMERA_SM_CMD_TYPE_API
@ hardware/qcom/camera/QCamera2/HAL/QCameraStateMachine.cpp void *QCameraStateMachine::smEvtProcRoutine(void *data) { int running = 1, ret; QCameraStateMachine *pme = (QCameraStateMachine *)data;LOGH("E"); do { do { ret = cam_sem_wait(&pme->cmd_sem); } while (ret != 0); // we got notified about new cmd avail in cmd queue // first check API cmd queue qcamera_sm_cmd_t *node = (qcamera_sm_cmd_t *)pme->api_queue.dequeue(); if (node == NULL) { // no API cmd, then check evt cmd queue node = (qcamera_sm_cmd_t *)pme->evt_queue.dequeue(); } if (node != NULL) { switch (node->cmd) { case QCAMERA_SM_CMD_TYPE_API: pme->stateMachine(node->evt, node->evt_payload); // API is in a way sync call, so evt_payload is managed by HWI // no need to free payload for API break; case QCAMERA_SM_CMD_TYPE_EVT: pme->stateMachine(node->evt, node->evt_payload); // EVT is async call, so payload need to be free after use free(node->evt_payload); node->evt_payload = NULL; break; case QCAMERA_SM_CMD_TYPE_EXIT: running = 0; break; } } while (running); LOGH("X"); return NULL;
}
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在 QCameraStateMachine::stateMachine() 中，会根据之前的 m_state 状态来决定当前代码怎么走的，
在初始化时 配置 m_state = QCAMERA_SM_STATE_PREVIEW_STOPPED;
因此我们第一次preview 是走 procEvtPreviewStoppedState
@ hardware/qcom/camera/QCamera2/HAL/QCameraStateMachine.cpp int32_t QCameraStateMachine::stateMachine(qcamera_sm_evt_enum_t evt, void *payload) { int32_t rc = NO_ERROR; LOGL("m_state %d, event (%d)", m_state, evt); switch (m_state) { case QCAMERA_SM_STATE_PREVIEW_STOPPED: rc = procEvtPreviewStoppedState(evt, payload); break; case QCAMERA_SM_STATE_PREVIEW_READY: rc = procEvtPreviewReadyState(evt, payload); break; case QCAMERA_SM_STATE_PREVIEWING: rc = procEvtPreviewingState(evt, payload); break; case QCAMERA_SM_STATE_PREPARE_SNAPSHOT: rc = procEvtPrepareSnapshotState(evt, payload); break; case QCAMERA_SM_STATE_PIC_TAKING: rc = procEvtPicTakingState(evt, payload); break; case QCAMERA_SM_STATE_RECORDING: rc = procEvtRecordingState(evt, payload); break; case QCAMERA_SM_STATE_VIDEO_PIC_TAKING: rc = procEvtVideoPicTakingState(evt, payload); break; case QCAMERA_SM_STATE_PREVIEW_PIC_TAKING: rc = procEvtPreviewPicTakingState(evt, payload); break; default: break; }if (m_parent->isDualCamera()) { /* Update the FOVControl dual camera result state based on the current state. Update the result only in previewing and recording states */ bool updateResultState = false; if (((m_state == QCAMERA_SM_STATE_PREVIEWING) || (m_state == QCAMERA_SM_STATE_RECORDING)) && !m_parent->mActiveAF && !m_parent->m_bPreparingHardware) { updateResultState = true; } m_parent->m_pFovControl->UpdateFlag(FOVCONTROL_FLAG_UPDATE_RESULT_STATE, &updateResultState); } return rc;
}
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9. [ HWI ] procEvtPreviewStoppedState
由于，我们下发的 evt 事件为 QCAMERA_SM_EVT_START_PREVIEW ，
首先调用 m_parent->preparePreview() 准备preview，添加 QCAMERA_CH_TYPE_PREVIEW
完毕后，将状态机，切换为 QCAMERA_SM_STATE_PREVIEW_READY.
@ hardware/qcom/camera/QCamera2/HAL/QCameraStateMachine.cpp
int32_t QCameraStateMachine::procEvtPreviewStoppedState(qcamera_sm_evt_enum_t evt,
void *payload)
{
int32_t rc = NO_ERROR;
qcamera_api_result_t result;
memset(&result, 0, sizeof(qcamera_api_result_t));
LOGL("event (%d)", evt);
switch (evt) {
case QCAMERA_SM_EVT_START_PREVIEW:
{
rc = m_parent->waitDeferredWork(m_parent->mParamInitJob);
if (m_parent->mPreviewWindow == NULL) {
rc = m_parent->preparePreview();
=======>
rc = addChannel(QCAMERA_CH_TYPE_PREVIEW);
========>
addPreviewChannel();
if(rc == NO_ERROR) {
// preview window is not set yet, move to previewReady state
m_state = QCAMERA_SM_STATE_PREVIEW_READY;
}
} else {
rc = m_parent->preparePreview();
if (rc == NO_ERROR) {
applyDelayedMsgs();
rc = m_parent->startPreview();
if (rc != NO_ERROR) {
m_parent->unpreparePreview();
} else {
// start preview success, move to previewing state
m_state = QCAMERA_SM_STATE_PREVIEWING;
}
}
}
result.status = rc;
result.request_api = evt;
result.result_type = QCAMERA_API_RESULT_TYPE_DEF;
m_parent->signalAPIResult(&result);
}
break;
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9.1 addChannel(QCAMERA_CH_TYPE_PREVIEW)
@ hardware/qcom/camera/QCamera2/HAL/QCamera2HWI.cpp
int32_t QCamera2HardwareInterface::addChannel(qcamera_ch_type_enum_t ch_type)
{
switch (ch_type) {
case QCAMERA_CH_TYPE_PREVIEW:
rc = addPreviewChannel();
break;
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在 addPreviewChannel() 中
调用 addStreamToChannel(pChannel, CAM_STREAM_TYPE_PREVIEW,preview_stream_cb_routine, this); 注册preview_stream 回调函数。
回调函数为 preview_stream_cb_routine()
同时设置同步信号回调函数： pChannel->setStreamSyncCB(CAM_STREAM_TYPE_PREVIEW, synchronous_stream_cb_routine);
回调函数为 synchronous_stream_cb_routine()
如果需要获取 raw yuv 的图，则调用rc = addStreamToChannel(pChannel,CAM_STREAM_TYPE_RAW, preview_raw_stream_cb_routine,this);
回调函数为 preview_raw_stream_cb_routine()
在回调函数 中会dump 为 yuv 文件
@ hardware/qcom/camera/QCamera2/HAL/QCamera2HWI.cpp int32_t QCamera2HardwareInterface::addPreviewChannel() { QCameraChannel *pChannel = NULL; char value[PROPERTY_VALUE_MAX]; bool raw_yuv = false;uint32_t handle = getCamHandleForChannel(QCAMERA_CH_TYPE_PREVIEW); =====> handle = mCameraHandle->camera_handle; // 初始化 QCameraChannel 对象，传递 mCameraHandle->ops 操作函数，ops 是在构造函数中初始化 pChannel = new QCameraChannel(handle, mCameraHandle->ops); // 初始化 Channel , preview only channel, don't need bundle attr and cb rc = pChannel->init(NULL, NULL, NULL); // meta data stream always coexists with preview if applicable rc = addStreamToChannel(pChannel, CAM_STREAM_TYPE_METADATA, metadata_stream_cb_routine, this); if (isRdiMode()) { if (isSecureMode()) { LOGI("RDI - secure CB"); rc = addStreamToChannel(pChannel, CAM_STREAM_TYPE_RAW, secure_stream_cb_routine, this); } else { LOGI("RDI - rdi CB"); rc = addStreamToChannel(pChannel, CAM_STREAM_TYPE_RAW, rdi_mode_stream_cb_routine, this); } } else { if (isSecureMode()) { LOGI("PREVIEW - secure CB"); rc = addStreamToChannel(pChannel, CAM_STREAM_TYPE_PREVIEW, secure_stream_cb_routine, this); } else { LOGI("PREVIEW - non-secure CB"); uint32_t cam_type = CAM_TYPE_MAIN; if (isDualCamera()) { cam_type = (CAM_TYPE_MAIN | CAM_TYPE_AUX); } if (isNoDisplayMode(cam_type)) { rc = addStreamToChannel(pChannel, CAM_STREAM_TYPE_PREVIEW, nodisplay_preview_stream_cb_routine, this); } else { rc = addStreamToChannel(pChannel, CAM_STREAM_TYPE_PREVIEW,preview_stream_cb_routine, this); ======> if (needSyncCB(CAM_STREAM_TYPE_PREVIEW) == TRUE) { pChannel->setStreamSyncCB(CAM_STREAM_TYPE_PREVIEW, synchronous_stream_cb_routine); } } } } if (((mParameters.fdModeInVideo()) || (mParameters.getDcrf() == true) || (mParameters.getRecordingHintValue() != true))&& (!isSecureMode())) { rc = addStreamToChannel(pChannel, CAM_STREAM_TYPE_ANALYSIS, NULL, this); } property_get("persist.camera.raw_yuv", value, "0"); raw_yuv = atoi(value) > 0 ? true : false; if ( raw_yuv ) { rc = addStreamToChannel(pChannel,CAM_STREAM_TYPE_RAW, preview_raw_stream_cb_routine,this); } m_channels[QCAMERA_CH_TYPE_PREVIEW] = pChannel; return rc;
}
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10. [ HWI ] procEvtPreviewReadyState
由于将状态机切换为 m_state = QCAMERA_SM_STATE_PREVIEW_READY;，所以代码如下：
@ hardware/qcom/camera/QCamera2/HAL/QCameraStateMachine.cpp
int32_t QCameraStateMachine::procEvtPreviewReadyState(qcamera_sm_evt_enum_t evt, void *payload)
{
LOGL("event (%d)", evt);
switch (evt) {
case QCAMERA_SM_EVT_START_PREVIEW:
{
if (m_parent->mPreviewWindow != NULL) {
rc = m_parent->startPreview();
if (rc != NO_ERROR) {
m_parent->unpreparePreview();
m_state = QCAMERA_SM_STATE_PREVIEW_STOPPED;
} else {
m_state = QCAMERA_SM_STATE_PREVIEWING;
}
}
// no ops here
rc = NO_ERROR;
result.status = rc;
result.request_api = evt;
result.result_type = QCAMERA_API_RESULT_TYPE_DEF;
m_parent->signalAPIResult(&result);
}
break;
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开始调用 m_parent->startPreview()，同时将状态切换为 m_state = QCAMERA_SM_STATE_PREVIEWING;
m_parent 定义为 QCamera2HardwareInterface *m_parent; // ptr to HWI
10. [ HWI ] QCamera2HardwareInterface::startPreview()
最终调用 startChannel(QCAMERA_CH_TYPE_PREVIEW);
@ hardware/qcom/camera/QCamera2/HAL/QCamera2HWI.cpp int QCamera2HardwareInterface::startPreview() { KPI_ATRACE_CAMSCOPE_CALL(CAMSCOPE_HAL1_STARTPREVIEW); int32_t rc = NO_ERROR;LOGI("E ZSL = %d Recording Hint = %d", mParameters.isZSLMode(), mParameters.getRecordingHintValue()); updateThermalLevel((void *)&mThermalLevel); setDisplayFrameSkip(); // start preview stream if (mParameters.isZSLMode() && mParameters.getRecordingHintValue() != true) { rc = startChannel(QCAMERA_CH_TYPE_ZSL); } else if (isSecureMode()) { if (mParameters.getSecureStreamType() == CAM_STREAM_TYPE_RAW && !isRdiMode()) { rc = startChannel(QCAMERA_CH_TYPE_RAW); }else { rc = startChannel(QCAMERA_CH_TYPE_PREVIEW); } } else { rc = startChannel(QCAMERA_CH_TYPE_PREVIEW); =======> rc = m_channels[ch_type]->start(); } if (isDualCamera()) { if (rc == NO_ERROR) { mParameters.setDCDeferCamera(CAM_DEFER_PROCESS); mParameters.setDCLowPowerMode(mActiveCameras); } else { mParameters.setDCDeferCamera(CAM_DEFER_FLUSH); } } if ((msgTypeEnabled(CAMERA_MSG_PREVIEW_FRAME)) && (m_channels[QCAMERA_CH_TYPE_CALLBACK] != NULL)) { rc = startChannel(QCAMERA_CH_TYPE_CALLBACK); } updatePostPreviewParameters(); m_stateMachine.setPreviewCallbackNeeded(true); // if job id is non-zero, that means the postproc init job is already // pending or complete if (mInitPProcJob == 0&& !(isSecureMode() && isRdiMode())) { mInitPProcJob = deferPPInit(); } m_bPreviewStarted = true; //configure snapshot skip for dual camera usecases configureSnapshotSkip(true); LOGI("X rc = %d", rc); return rc;
}
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11. [ HWI ] QCameraChannel
在 m_channels[QCAMERA_CH_TYPE_PREVIEW]->start() 中，
int32_t QCameraChannel::start() { // there is more than one stream in the channel // we need to notify mctl that all streams in this channel need to be bundled for (size_t i = 0; i < mStreams.size(); i++) { if ((mStreams[i] != NULL) &&(validate_handle(m_handle, mStreams[i]->getChannelHandle()))) { mStreams[i]->setBundleInfo(); } } for (size_t i = 0; i < mStreams.size(); i++) { if ((mStreams[i] != NULL) && (validate_handle(m_handle, mStreams[i]->getChannelHandle()))) { mStreams[i]->start(); } } rc = m_camOps->start_channel(m_camHandle, m_handle);m_bIsActive = true; for (size_t i = 0; i < mStreams.size(); i++) { if (mStreams[i] != NULL) { mStreams[i]->cond_signal(); } } return rc;
}
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可以看到 在代码中对每个stream 进行操作：
mStreams[i]->setBundleInfo();
mStreams[i]->start();
m_camOps->start_channel(m_camHandle, m_handle);
mStreams[i]->cond_signal();
我们先来看下有哪些 stream 。
可以看到 ，我们可能有这三个stream ： CAM_STREAM_TYPE_METADATA、CAM_STREAM_TYPE_PREVIEW、CAM_STREAM_TYPE_RAW
rc = addStreamToChannel(pChannel, CAM_STREAM_TYPE_METADATA, metadata_stream_cb_routine, this);
rc = addStreamToChannel(pChannel, CAM_STREAM_TYPE_PREVIEW,preview_stream_cb_routine, this);
pChannel->setStreamSyncCB(CAM_STREAM_TYPE_PREVIEW, synchronous_stream_cb_routine);
rc = addStreamToChannel(pChannel,CAM_STREAM_TYPE_RAW, preview_raw_stream_cb_routine,this);
12. mm_camera_ops 定义
@ hardware/qcom/camera/QCamera2/stack/mm-camera-interface/src/mm_camera_interface.c
/* camera ops v-table */
static mm_camera_ops_t mm_camera_ops = {
.query_capability = mm_camera_intf_query_capability,
.register_event_notify = mm_camera_intf_register_event_notify,
.close_camera = mm_camera_intf_close,
.set_parms = mm_camera_intf_set_parms,
.get_parms = mm_camera_intf_get_parms,
.do_auto_focus = mm_camera_intf_do_auto_focus,
.cancel_auto_focus = mm_camera_intf_cancel_auto_focus,
.prepare_snapshot = mm_camera_intf_prepare_snapshot,
.start_zsl_snapshot = mm_camera_intf_start_zsl_snapshot,
.stop_zsl_snapshot = mm_camera_intf_stop_zsl_snapshot,
.map_buf = mm_camera_intf_map_buf,
.map_bufs = mm_camera_intf_map_bufs,
.unmap_buf = mm_camera_intf_unmap_buf,
.add_channel = mm_camera_intf_add_channel,
.delete_channel = mm_camera_intf_del_channel,
.get_bundle_info = mm_camera_intf_get_bundle_info,
.add_stream = mm_camera_intf_add_stream,
.link_stream = mm_camera_intf_link_stream,
.delete_stream = mm_camera_intf_del_stream,
.config_stream = mm_camera_intf_config_stream,
.qbuf = mm_camera_intf_qbuf,
.cancel_buffer = mm_camera_intf_cancel_buf,
.get_queued_buf_count = mm_camera_intf_get_queued_buf_count,
.map_stream_buf = mm_camera_intf_map_stream_buf,
.map_stream_bufs = mm_camera_intf_map_stream_bufs,
.unmap_stream_buf = mm_camera_intf_unmap_stream_buf,
.set_stream_parms = mm_camera_intf_set_stream_parms,
.get_stream_parms = mm_camera_intf_get_stream_parms,
.start_channel = mm_camera_intf_start_channel,
.stop_channel = mm_camera_intf_stop_channel,
.request_super_buf = mm_camera_intf_request_super_buf,
.cancel_super_buf_request = mm_camera_intf_cancel_super_buf_request,
.flush_super_buf_queue = mm_camera_intf_flush_super_buf_queue,
.configure_notify_mode = mm_camera_intf_configure_notify_mode,
.process_advanced_capture = mm_camera_intf_process_advanced_capture,
.get_session_id = mm_camera_intf_get_session_id,
.set_dual_cam_cmd = mm_camera_intf_set_dual_cam_cmd,
.flush = mm_camera_intf_flush,
.register_stream_buf_cb = mm_camera_intf_register_stream_buf_cb,
.register_frame_sync = mm_camera_intf_reg_frame_sync,
.handle_frame_sync_cb = mm_camera_intf_handle_frame_sync_cb
};
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13. [ HWI ] QCameraStream
13.1 mStreams[i]->setBundleInfo()
- 检查当前 mCamHandle 是否有绑定 stream
@ hardware/qcom/camera/QCamera2/HAL/QCameraStream.cpp // set bundle for this stream to MCT int32_t QCameraStream::setBundleInfo() { cam_stream_parm_buffer_t param, aux_param; uint32_t active_handle = get_main_camera_handle(mChannelHandle); =====> @ hardware/qcom/camera/QCamera2/stack/mm-camera-interface/src/mm_camera_interface.c return mm_camera_util_get_handle_by_num(0, handle);memset(&bundleInfo, 0, sizeof(bundleInfo)); if (active_handle) { // 1. 检查当前 mCamHandle 是否有绑定 stream ret = mCamOps->get_bundle_info(mCamHandle, active_handle,&bundleInfo); =============================> + @ hardware/qcom/camera/QCamera2/stack/mm-camera-interface/src/mm_camera_interface.c + rc = mm_camera_get_bundle_info(my_obj, m_chid, bundle_info); + ==============> + @ hardware/qcom/camera/QCamera2/stack/mm-camera-interface/src/mm_camera.c + rc = mm_channel_fsm_fn(ch_obj,MM_CHANNEL_EVT_GET_BUNDLE_INFO,(void *)bundle_info,NULL); + =================> + @ hardware/qcom/camera/QCamera2/stack/mm-camera-interface/src/mm_camera_channel.c + rc = mm_channel_fsm_fn_stopped(my_obj, evt, in_val, out_val); + =================> + @ hardware/qcom/camera/QCamera2/stack/mm-camera-interface/src/mm_camera_channel.c + case MM_CHANNEL_EVT_GET_BUNDLE_INFO: + cam_bundle_config_t *payload = (cam_bundle_config_t *)in_val; + rc = mm_channel_get_bundle_info(my_obj, payload); + ==================> + @ hardware/qcom/camera/QCamera2/stack/mm-camera-interface/src/mm_camera_channel.c + s_obj = mm_channel_util_get_stream_by_handler(my_obj, my_obj->streams[i].my_hdl); + ================> + @ hardware/qcom/camera/QCamera2/stack/mm-camera-interface/src/mm_camera_channel.c + for(i = 0; i < MAX_STREAM_NUM_IN_BUNDLE; i++) { + if ((MM_STREAM_STATE_NOTUSED != ch_obj->streams[i].state) && + (handler == ch_obj->streams[i].my_hdl)) { + s_obj = &ch_obj->streams[i]; + break; + } + } + return s_obj; <============================= memset(¶m, 0, sizeof(cam_stream_parm_buffer_t)); param.type = CAM_STREAM_PARAM_TYPE_SET_BUNDLE_INFO; param.bundleInfo = bundleInfo; } mStreamInfo->parm_buf = param; if ((aux_param.bundleInfo.num_of_streams > 1)&& (mStreamInfo->aux_str_info != NULL)) { mStreamInfo->aux_str_info->parm_buf = aux_param; } if (mStreamInfo->parm_buf.bundleInfo.num_of_streams > 1) { uint32_t channelHdl = get_main_camera_handle(mChannelHandle); uint32_t streamHdl = get_main_camera_handle(mHandle); if (mCamType == CAM_TYPE_AUX) { channelHdl = mChannelHandle; streamHdl = mHandle; } ret = mCamOps->set_stream_parms(mCamHandle, channelHdl, streamHdl, &mStreamInfo->parm_buf); ==================> + @ hardware/qcom/camera/QCamera2/stack/mm-camera-interface/src/mm_camera_interface.c + rc = mm_camera_set_stream_parms(my_obj, chid, strid, parms); + ==============> + @ hardware/qcom/camera/QCamera2/stack/mm-camera-interface/src/mm_camera.c + rc = mm_channel_fsm_fn(ch_obj, MM_CHANNEL_EVT_SET_STREAM_PARM, (void *)&payload, NULL); + ============> + @ hardware/qcom/camera/QCamera2/stack/mm-camera-interface/src/mm_camera_channel.c + rc = mm_channel_fsm_fn_stopped(my_obj, evt, in_val, out_val); + =============> + case MM_CHANNEL_EVT_GET_STREAM_PARM: + { + mm_evt_paylod_set_get_stream_parms_t *payload = + (mm_evt_paylod_set_get_stream_parms_t *)in_val; + rc = mm_channel_get_stream_parm(my_obj, payload); + ===============> + rc = mm_stream_fsm_fn(s_obj, MM_STREAM_EVT_GET_PARM,(void *)payload, NULL); + ============> + rc = mm_stream_fsm_inited(my_obj, evt, in_val, out_val); + =============> + @ hardware/qcom/camera/QCamera2/stack/mm-camera-interface/src/mm_camera_stream.c + rc = mm_stream_get_parm(my_obj, payload->parms); + ============> + rc = mm_camera_util_g_ctrl(cam_obj, stream_id, my_obj->fd, + CAM_PRIV_STREAM_PARM, &value); + ==============> + @ hardware/qcom/camera/QCamera2/stack/mm-camera-interface/src/mm_camera.c + rc = ioctl(fd, VIDIOC_G_CTRL, &control); + LOGD("fd=%d, G_CTRL, id=0x%x, rc = %d\n", fd, id, rc); + if (value != NULL) { + *value = control.value; + } + ==============> + @ kernel/msm-4.4/drivers/media/v4l2-core/v4l2-subdev.c + static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg) + { + case VIDIOC_G_CTRL: + return v4l2_g_ctrl(vfh->ctrl_handler, arg); <============================= }
}
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13.2 mStreams[i]->start()
初始化 mStreamMetaMemory 。
@ hardware/qcom/camera/QCamera2/HAL/QCameraStream.cpp int32_t QCameraStream::start() { int32_t rc = 0; mDataQ.init(); =============> + @ hardware/qcom/camera/QCamera2/util/QCameraQueue.cpp + m_active = true; <============= // 创建 frame线程 ，函数运行 dataProcRoutine rc = mProcTh.launch(dataProcRoutine, this); =============> + pthread_create(&cmd_pid, NULL, dataProcRoutine, user_data); <=============mCurMetaMemory = NULL; mCurBufIndex = -1; mCurMetaIndex = -1; mFirstTimeStamp = 0; memset (&mStreamMetaMemory, 0, (sizeof(MetaMemory) * CAMERA_MIN_VIDEO_BATCH_BUFFERS)); return rc;
}
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13.2.1 Camera 数据处理线程 及 QCameraStream的 Callbak 调用
void *QCameraStream::dataProcRoutine(void *data) { int running = 1; QCameraStream *pme = (QCameraStream *)data; QCameraCmdThread *cmdThread = &pme->mProcTh; cmdThread->setName("CAM_strmDatProc"); LOGD("E"); do { do { // 等待消息到来 ret = cam_sem_wait(&cmdThread->cmd_sem); } while (ret != 0);// we got notified about new cmd avail in cmd queue camera_cmd_type_t cmd = cmdThread->getCmd(); switch (cmd) { case CAMERA_CMD_TYPE_DO_NEXT_JOB: { LOGD("Do next job"); // 当有数据到来时，调用 QCameraStream的 callback 函数，将 frame 上报 mm_camera_super_buf_t *frame = (mm_camera_super_buf_t *)pme->mDataQ.dequeue(); if (NULL != frame) { if (pme->mDataCB != NULL) { pme->mDataCB(frame, pme, pme->mUserData); } else { // no data cb routine, return buf here pme->bufDone(frame); free(frame); } } } break; case CAMERA_CMD_TYPE_EXIT: LOGH("Exit"); /* flush data buf queue */ pme->mDataQ.flush(); running = 0; break; default: break; } } while (running); LOGH("X"); return NULL;
}
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13.3 m_camOps->start_channel(m_camHandle, m_handle)
@ hardware/qcom/camera/QCamera2/stack/mm-camera-interface/src/mm_camera_interface.c
/* camera ops v-table */
static mm_camera_ops_t mm_camera_ops = {
.start_channel = mm_camera_intf_start_channel,
}
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@ hardware/qcom/camera/QCamera2/stack/mm-camera-interface/src/mm_camera_interface.c static int32_t mm_camera_intf_start_channel(uint32_t camera_handle, uint32_t ch_id) { int32_t rc = -1; mm_camera_obj_t * my_obj = NULL; uint32_t chid = get_main_camera_handle(ch_id); uint32_t aux_chid = get_aux_camera_handle(ch_id);if (chid) { uint32_t handle = get_main_camera_handle(camera_handle); my_obj = mm_camera_util_get_camera_by_handler(handle); if(my_obj) { // 启动该 channel 中的所有 stream rc = mm_camera_start_channel(my_obj, chid); ===================> + @ hardware/qcom/camera/QCamera2/stack/mm-camera-interface/src/mm_camera.c + rc = mm_channel_fsm_fn(ch_obj, MM_CHANNEL_EVT_START, NULL, NULL); + =============> + @ hardware/qcom/camera/QCamera2/stack/mm-camera-interface/src/mm_camera.c + case MM_CHANNEL_STATE_STOPPED: + rc = mm_channel_fsm_fn_stopped(my_obj, evt, in_val, out_val); + ==============> + @ hardware/qcom/camera/QCamera2/stack/mm-camera-interface/src/mm_camera_channel.c + case MM_CHANNEL_EVT_START:{ + rc = mm_channel_start(my_obj); + if (0 == rc) { + my_obj->state = MM_CHANNEL_STATE_ACTIVE; + } <=================== } } LOGH("X ch_id = %u rc = %d", ch_id, rc); return rc;
}
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在 mm_camera_channel.c 的 mm_channel_start() 中
- 创建 pthread, 名为 “CAM_SuperBuf”
- 创建 pthread, 名为 “CAM_SuperBufCB”， 用于处理 stream buf
- 创建 streams 对应的 buff
- 注册 streams 对应的 buf
- 开始 stream
@ hardware/qcom/camera/QCamera2/stack/mm-camera-interface/src/mm_camera_channel.c int32_t mm_channel_start(mm_channel_t *my_obj) { int32_t rc = 0; int i = 0, j = 0; mm_stream_t *s_objs[MAX_STREAM_NUM_IN_BUNDLE] = {NULL}; uint8_t num_streams_to_start = 0; uint8_t num_streams_in_bundle_queue = 0; mm_stream_t *s_obj = NULL; int meta_stream_idx = 0; cam_stream_type_t stream_type = CAM_STREAM_TYPE_DEFAULT;for (i = 0; i < MAX_STREAM_NUM_IN_BUNDLE; i++) { if (my_obj->streams[i].my_hdl > 0) { s_obj = mm_channel_util_get_stream_by_handler(my_obj, my_obj->streams[i].my_hdl); } } if (meta_stream_idx > 0 ) { /* always start meta data stream first, so switch the stream object with the first one */ s_obj = s_objs[0]; s_objs[0] = s_objs[meta_stream_idx]; s_objs[meta_stream_idx] = s_obj; } if (NULL != my_obj->bundle.super_buf_notify_cb) { /* need to send up cb, therefore launch thread */ /* init superbuf queue */ mm_channel_superbuf_queue_init(&my_obj->bundle.superbuf_queue); my_obj->bundle.superbuf_queue.num_streams = num_streams_in_bundle_queue; my_obj->bundle.superbuf_queue.expected_frame_id = my_obj->bundle.superbuf_queue.attr.user_expected_frame_id; my_obj->bundle.superbuf_queue.expected_frame_id_without_led = 0; my_obj->bundle.superbuf_queue.led_off_start_frame_id = 0; my_obj->bundle.superbuf_queue.led_on_start_frame_id = 0; my_obj->bundle.superbuf_queue.led_on_num_frames = 0; my_obj->bundle.superbuf_queue.good_frame_id = 0; for (i = 0; i < num_streams_to_start; i++) { /* Only bundle streams that belong to the channel */ if(!(s_objs[i]->stream_info->noFrameExpected) ||(s_objs[i]->is_frame_shared && (s_objs[i]->ch_obj == my_obj))) { if (s_objs[i]->ch_obj == my_obj) { /* set bundled flag to streams */ s_objs[i]->is_bundled = 1; } my_obj->bundle.superbuf_queue.bundled_streams[j] = s_objs[i]->my_hdl; if (s_objs[i]->is_frame_shared && (s_objs[i]->ch_obj == my_obj)) { mm_stream_t *dst_obj = NULL; if (s_objs[i]->master_str_obj != NULL) { dst_obj = s_objs[i]->master_str_obj; } else if (s_objs[i]->aux_str_obj[0] != NULL) { dst_obj = s_objs[i]->aux_str_obj[0]; } if (dst_obj) { my_obj->bundle.superbuf_queue.bundled_streams[j]|= dst_obj->my_hdl; } } j++; } } // 创建 pthread, 名为 "CAM_SuperBuf" /* launch cb thread for dispatching super buf through cb */ snprintf(my_obj->cb_thread.threadName, THREAD_NAME_SIZE, "CAM_SuperBuf"); mm_camera_cmd_thread_launch(&my_obj->cb_thread, mm_channel_dispatch_super_buf,(void*)my_obj); // 创建 pthread, 名为 "CAM_SuperBufCB"， 用于处理 stream buf /* launch cmd thread for super buf dataCB */ snprintf(my_obj->cmd_thread.threadName, THREAD_NAME_SIZE, "CAM_SuperBufCB"); mm_camera_cmd_thread_launch(&my_obj->cmd_thread, mm_channel_process_stream_buf, (void*)my_obj); ===============> pthread_create(&cmd_thread->cmd_pid, NULL, mm_channel_process_stream_buf, (void *)cmd_thread); /* set flag to TRUE */ my_obj->bundle.is_active = TRUE; } /* link any streams first before starting the rest of the streams */ for (i = 0; i < num_streams_to_start; i++) { if ((s_objs[i]->ch_obj != my_obj) && my_obj->bundle.is_active) { pthread_mutex_lock(&s_objs[i]->linked_stream->buf_lock); s_objs[i]->linked_stream->linked_obj = my_obj; s_objs[i]->linked_stream->is_linked = 1; pthread_mutex_unlock(&s_objs[i]->linked_stream->buf_lock); continue; } } for (i = 0; i < num_streams_to_start; i++) { if (s_objs[i]->ch_obj != my_obj) { continue; } /* all streams within a channel should be started at the same time */ if (s_objs[i]->state == MM_STREAM_STATE_ACTIVE) { LOGE("stream already started idx(%d)", i); rc = -1; break; } // 创建 streams 对应的 buff /* allocate buf */ rc = mm_stream_fsm_fn(s_objs[i], MM_STREAM_EVT_GET_BUF, NULL, NULL); // 注册 streams 对应的 buf /* reg buf */ rc = mm_stream_fsm_fn(s_objs[i], MM_STREAM_EVT_REG_BUF, NULL, NULL); // 开始 stream /* start stream */ rc = mm_stream_fsm_fn(s_objs[i], MM_STREAM_EVT_START, NULL, NULL); =================> + snprintf(my_obj->cmd_thread.threadName, THREAD_NAME_SIZE, "CAM_StrmAppData"); + mm_camera_cmd_thread_launch(&my_obj->cmd_thread, mm_stream_dispatch_app_data, (void *)my_obj); + my_obj->state = MM_STREAM_STATE_ACTIVE; + rc = mm_stream_streamon(my_obj); <================= } my_obj->bWaitForPrepSnapshotDone = 0; if (my_obj->bundle.superbuf_queue.attr.enable_frame_sync) { LOGH("registering Channel obj %p", my_obj); mm_frame_sync_register_channel(my_obj); } return rc;
}
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