使用MediaRecorder录制视频的暂停需求实现

基于录制视频的开源项目,https://github.com/jmolsmobile/LandscapeVideoCamera,修改

上面的开源项目实现了使用MediaRecorder和Camera录制视频,如今需要在录制视频的时候增加暂停的功能。

关键思路:因为MediaRecorder只有start(),stop(),prepare(),release()等方法,并没有暂停,所以得在最终生成的文件想办法,

找到一个解决办法就是每一次暂停都会调用stop(),然后释放资源,当用户点了继续的时候重新录制一个新的视频,最后将所有的文件合并为一个文件即可(删除掉刚刚保存过的若干个临时文件)。

1.在RecordingButtonInterface.java中增加三个方法暂停和继续以及选择本地文件。

在VideoCaptureActivity中实现接口方法,对呀的回调中写逻辑,

关于选择本地文件,需要注意在android 4.4(API  19)以下和以上可能会出现不同的情况,需要分别判断。

如下



@Nullable

privateString getvideopath(Intent data) {

if(data ==null) {

return null;

}

Uri mUri = data.getData();

if(Build.VERSION.SDK_INT>= Build.VERSION_CODES.KITKAT) {

if(DocumentsContract.isDocumentUri(this, mUri)) {

if(isMediaDocument(mUri)) {

finalString docId = DocumentsContract.getDocumentId(mUri);

finalString[] split = docId.split(":");

finalString type = split[0];

Uri contentUri =null;

if("image".equals(type)) {

contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;

}else if("video".equals(type)) {

contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;

}else if("audio".equals(type)) {

contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;

}

finalString selection ="_id=?";

finalString[] selectionArgs =newString[]{

split[1]

};

returngetDataColumn(this, contentUri, selection, selectionArgs);

}else if(isExternalStorageDocument(mUri)) {

finalString docId = DocumentsContract.getDocumentId(mUri);

finalString[] split = docId.split(":");

finalString type = split[0];

if("primary".equalsIgnoreCase(type)) {

returnEnvironment.getExternalStorageDirectory() +"/"+ split[1];

}

}

}

// MediaStore (and general)

else if("content".equalsIgnoreCase(mUri.getScheme())) {

returngetDataColumn(this, mUri,null,null);

}

// File

else if("file".equalsIgnoreCase(mUri.getScheme())) {

returnmUri.getPath();

}

}

// MediaStore (and general)

else if("content".equalsIgnoreCase(mUri.getScheme())) {

returngetDataColumn(this, mUri,null,null);

}

// File

else if("file".equalsIgnoreCase(mUri.getScheme())) {

returnmUri.getPath();

}

return null;

}

privateString getDataColumn(Context mContext, Uri mContentUri, String mSelection, String[] mSelectionArgs) {

Cursor cursor =null;

finalString column ="_data";

finalString[] projection = {

column

};

try{

cursor = mContext.getContentResolver().query(mContentUri, projection, mSelection, mSelectionArgs,

null);

if(cursor !=null&& cursor.moveToFirst()) {

final intindex = cursor.getColumnIndexOrThrow(column);

returncursor.getString(index);

}

}finally{

if(cursor !=null)

cursor.close();

}

return null;

}

private booleanisMediaDocument(Uri mUri) {

return"com.android.providers.media.documents".equals(mUri.getAuthority());

}

private booleanisExternalStorageDocument(Uri mUri) {

return"com.android.externalstorage.documents".equals(mUri.getAuthority());

}



2.关于暂停视频录制

停止上一个视频的录制并且释放资源

//录制视频暂停的处理

@Override

public voidonRecordPause() {

mVideoRecorder.stopRecording(null);

mVideoCaptureView.updateUIRecordingPause(getVideoThumbnail());

releaseAllResources();

}

点击继续的时候

重新定义需要保存文件

VideoFile mVideoFilex =newVideoFile(mVideoFile.getFullPath().replace(".mp4",cout+".mp4"));

mVideoFiles.add(mVideoFilex.getFullPath());

Display display = ((WindowManager) getSystemService(WINDOW_SERVICE)).getDefaultDisplay();

mVideoRecorder=newVideoRecorder(this,mCaptureConfiguration, mVideoFilex,newCameraWrapper(newNativeCamera(), display.getRotation()),

mVideoCaptureView.getPreviewSurfaceHolder());

重新开始录制,

完成后调用视频合成方法


视频合成:需要aspectjrt-1.6.1.jar,isoparser-1.0.5.jar

调用

VideoUtils.appendVideo(this,mVideoFile.getFullPath(),mVideoFiles);

内部实现

public static voidappendVideo(Context context,String saveVideoPath,List videos)throwsIOException{

Movie[] inMovies =newMovie[videos.size()];

intindex =0;

for(String video:videos)

{

inMovies[index] = MovieCreator.build(video);

index++;

}

List videoTracks =newLinkedList();

List audioTracks =newLinkedList();

for(Movie m : inMovies) {

for(Track t : m.getTracks()) {

if(t.getHandler().equals("soun")) {

audioTracks.add(t);

}

if(t.getHandler().equals("vide")) {

videoTracks.add(t);

}

}

}

Movie result =newMovie();

if(audioTracks.size() >0) {

result.addTrack(newAppendTrack(audioTracks.toArray(newTrack[audioTracks.size()])));

}

if(videoTracks.size() >0) {

result.addTrack(newAppendTrack(videoTracks.toArray(newTrack[videoTracks.size()])));

}

Container out =newDefaultMp4Builder().build(result);

FileChannel fc =newRandomAccessFile(String.format(saveVideoPath),"rw").getChannel();

out.writeContainer(fc);

fc.close();

}

最后不要忘记删除已经录制的文件

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