Android音视频之MediaRecorder音视频录制

parameters.setFocusMode(Camera.Parameters.FOCUS_MODE_AUTO); }

mCamera.setParameters(parameters); }

int rotation =

getWindowManager().getDefaultDisplay().getRotation(); int orientation = orientations.get(rotation); mCamera.setDisplayOrientation(orientation); }

@Override

protected void onResume() { super.onResume(); initCamera(); }

@Override

public void onPause() { releaseCamera(); super.onPause(); }

/**

* 开始录制 */

private void startRecord() {

if (mRecorder == null) {

mRecorder = new MediaRecorder(); // 创建MediaRecorder }

if (mCamera != null) { mCamera.stopPreview(); mCamera.unlock();

mRecorder.setCamera(mCamera); } try {

// 设置音频采集方式

mRecorder.setAudioSource(MediaRecorder.AudioSource.CAMCORDER); //设置视频的采集方式

mRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA); //设置文件的输出格式

mRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);//aac_adif, aac_adts, output_format_rtp_avp, output_format_mpeg2ts ,webm //设置audio的编码格式

mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB); //设置video的编码格式

mRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264); //设置录制的视频编码比特率

mRecorder.setVideoEncodingBitRate(1024 * 1024); //设置录制的视频帧率,注意文档的说明: mRecorder.setVideoFrameRate(30); //设置要捕获的视频的宽度和高度

mSurfaceHolder.setFixedSize(320, 240);//最高只能设置640x480

mRecorder.setVideoSize(320, 240);//最高只能设置640x480 //设置记录会话的最大持续时间(毫秒) mRecorder.setMaxDuration(60 * 1000);

mRecorder.setPreviewDisplay(mSurfaceHolder.getSurface()); String path = getExternalCacheDir().getPath(); if (path != null) {

File dir = new File(path + \ if (!dir.exists()) { dir.mkdir(); }

path = dir + \\

//设置输出文件的路径

mRecorder.setOutputFile(path); //准备录制

mRecorder.prepare(); //开始录制

mRecorder.start(); isRecording = true;

btnStartStop.setText(\停止\ }

} catch (Exception e) { e.printStackTrace(); } } /**

* 停止录制 */

private void stopRecord() { try {

//停止录制

mRecorder.stop(); //重置

mRecorder.reset();

btnStartStop.setText(\开始\ } catch (Exception e) { e.printStackTrace(); }

isRecording = false; }

/**

* 释放MediaRecorder */

private void releaseMediaRecorder() { if (mRecorder != null) { mRecorder.release(); mRecorder = null; } }

/**

* 释放相机资源 */

private void releaseCamera() { try {

if (mCamera != null) {

mCamera.stopPreview();

mCamera.setPreviewCallback(null); mCamera.unlock(); mCamera.release(); }

} catch (RuntimeException e) { } finally {

mCamera = null; } }

@Override

public void surfaceChanged(SurfaceHolder holder, int format, int width,

int height) {

// 将holder,这个holder为开始在onCreate里面取得的holder,将它赋给mSurfaceHolder

mSurfaceHolder = holder; if (mCamera == null) { return; } try {

//设置显示

mCamera.setPreviewDisplay(holder); mCamera.startPreview(); } catch (Exception e) { e.printStackTrace(); releaseCamera(); finish(); } }

@Override

public void surfaceCreated(SurfaceHolder holder) {

// 将holder,这个holder为开始在onCreate里面取得的holder,将它赋给mSurfaceHolder

mSurfaceHolder = holder; }

@Override

public void surfaceDestroyed(SurfaceHolder holder) { // surfaceDestroyed的时候同时对象设置为null if (isRecording && mCamera != null) { mCamera.lock(); }

mSurfaceView = null; mSurfaceHolder = null; releaseMediaRecorder(); releaseCamera(); }

private class CameraSizeComparator implements Comparator {

public int compare(Camera.Size lhs, Camera.Size rhs) { if (lhs.width == rhs.width) { return 0;

} else if (lhs.width > rhs.width) { return 1; } else {

return -1; } } } }

3.)布局文件

xmlns:android=\ xmlns:tools=\ android:layout_width=\ android:layout_height=\ android:orientation=\

android:id=\

android:layout_width=\ android:layout_height=\ android:layout_weight=\ />

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