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POAndroid preview processing while video recording
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copied!<p>I am using Android development (SDK 2.2) and I would like to make a video recording with <code>mediaRecorder</code> and, at the same time, do some process on each preview frame. </p> <p>I record video with <code>MediaRecorder</code> in a project, in an other I use the <code>onPreviewFrame(byte[] data</code>, <code>Camera camera</code>) (from <code>PreviewCallback</code>) for processing preview pictures.</p> <p>I've tried to create a Camera and use it with <code>mediaRecorder</code> (<code>setCamera</code> function) but it doesn't work.</p> <p>Is it possible to do both in the same time? </p> <p>Actually I don't understand how to link two things?</p> <p>My code :</p> <pre><code>package ch.fraise; import java.io.IOException; import android.app.Activity; import android.hardware.Camera; import android.hardware.Camera.PreviewCallback; import android.media.MediaRecorder; import android.os.Bundle; import android.util.Log; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; import android.view.SurfaceHolder; import android.view.SurfaceView; public class CameraActivity extends Activity implements SurfaceHolder.Callback, Camera.AutoFocusCallback { private SurfaceView preview; private SurfaceHolder previewHolder; private MediaRecorder mRecorder; private Camera mCamera; private boolean mPreviewRunning = false; private boolean mCaptureFrame = false; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); Log.e("", "Begin onCreate"); setContentView(R.layout.main); preview = (SurfaceView) findViewById(R.id.surfaceView1); previewHolder = preview.getHolder(); previewHolder.addCallback(this); previewHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); mRecorder = new MediaRecorder(); } @Override public void onResume() { super.onResume(); } @Override public void onPause() { super.onPause(); } @Override public boolean onCreateOptionsMenu(Menu menu) { MenuInflater inflater = getMenuInflater(); inflater.inflate(R.menu.capture_menu, menu); return true; } public void startRecording() { Log.e("", "Begin StartRecording"); mCaptureFrame = true; mRecorder.start(); } public void stopRecording() { Log.e("", "Begin StopChange"); mRecorder.stop(); } @Override public boolean onOptionsItemSelected(MenuItem item) { // Handle item selection switch (item.getItemId()) { case R.id.startRecording: startRecording(); return true; case R.id.stopRecording: stopRecording(); return true; default: return super.onOptionsItemSelected(item); } } @Override public void surfaceCreated(SurfaceHolder holder) { Log.e("", "Begin surfaceDestroy"); mCamera = Camera.open(); } @Override public void surfaceDestroyed(SurfaceHolder holder) { mCamera.stopPreview(); mPreviewRunning = false; mCamera.release(); mRecorder.reset(); mRecorder.release(); } @Override public void onAutoFocus(boolean success, Camera camera) { // TODO Auto-generated method stub } /* * PreviewCallback() * * this callback captures the preview at every frame and puts it in a byte * buffer. we will evaluate if this is a frame that we want to process, and * if so, we will send it to an asynchronous thread that will process it to * an ARGB Bitmap and POST it to the server */ PreviewCallback previewCallback = new PreviewCallback() { public void onPreviewFrame(byte[] data, Camera camera) { Log.e("", "onPreviewFrame pass"); if (mCaptureFrame) { mCaptureFrame = false; // new FrameHandler().execute(data); } } }; @Override public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { Log.e("", "Begin SurfaceChange"); mRecorder.reset(); mRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA); mRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4); mRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.MPEG_4_SP); mRecorder.setOutputFile("/sdcard/videotest2.mp4"); mRecorder.setVideoFrameRate(30); mRecorder.setPreviewDisplay(previewHolder.getSurface()); try { mRecorder.prepare(); } catch (IllegalStateException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } if (mPreviewRunning) mCamera.stopPreview(); Camera.Parameters p = mCamera.getParameters(); // p.setPreviewSize(width, height); mCamera.setParameters(p); try { mCamera.setPreviewDisplay(holder); } catch (IOException e) { e.printStackTrace(); } mCamera.setPreviewCallback(previewCallback); mCamera.startPreview(); mPreviewRunning = true; } } </code></pre> <p>and the permissions in the XML file :</p> <pre><code><uses-permission android:name="android.permission.CAMERA" /> <uses-permission android:name="android.permission.RECORD_AUDIO" /> <uses-permission android:name="android.permission.RECORD_VIDEO" /> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/> </code></pre>

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