I'm trying to use android MediaCodec class to decode h264 video stream of remote camera. My code is:
public class RemoteCamera {
public interface OnCameraListener {
void onConnected();
void onFailureConnection();
void onDisconnected();
void onReady();
}
private static final int MAX_NAL_LEN = 1024 * 1024;
private static final String TAG = "RemoteCamera";
private OutputThread mOutputThread;
private WebSocketManager mWebSocketManager;
private OnCameraListener mOnCameraListener;
private int mSearchState = 0;
private byte[] mNalData;
private int mNalDataPos;
private MediaCodec mDecoder;
private MediaFormat mFormat;
private SurfaceView mSurfaceView;
private MediaCodec.BufferInfo mInfo = new MediaCodec.BufferInfo();
private boolean mIsWaitingForSPS = true;
public RemoteCamera(final SurfaceView surfaceView, final String wss) {
mSurfaceView = surfaceView;
mWebSocketManager = new WebSocketManager(wss);
mWebSocketManager.setWSListener(new WebSocketManager.OnWSListener() {
@Override
public void onOpen() {
if (mOnCameraListener != null) {
mOnCameraListener.onConnected();
}
}
@Override
public void onClosed() {
if (mOnCameraListener != null) {
mOnCameraListener.onDisconnected();
}
}
@Override
public void onFailure() {
if (mOnCameraListener != null) {
mOnCameraListener.onFailureConnection();
}
}
@Override
public synchronized void onMessage(final ByteString bytes) {
final ByteBuffer bb = ByteBuffer.wrap(bytes.toByteArray());
if (mIsWaitingForSPS) {
if (isSPSUnit(bb)) {
mIsWaitingForSPS = false;
if (mOnCameraListener != null) {
mOnCameraListener.onReady();
}
} else {
return;
}
}
parseDatagram(bb.array(), bytes.size());
}
});
mNalData = new byte[MAX_NAL_LEN];
mNalDataPos = 0;
try {
mDecoder = MediaCodec.createDecoderByType("video/avc");
} catch (Exception e) {
Log.d(TAG, e.toString());
return;
}
mFormat = MediaFormat.createVideoFormat("video/avc", 320, 240);
}
public void setOnCameraListener(final OnCameraListener cameraListener) {
mOnCameraListener = cameraListener;
}
public void startStreaming() {
mSurfaceView.getHolder().addCallback(new SurfaceHolder.Callback() {
@Override
public void surfaceCreated(SurfaceHolder surfaceHolder) {
try {
mDecoder.configure(mFormat, mSurfaceView.getHolder().getSurface(), null, 0);
} catch (Exception e) {
Log.d(TAG, e.toString());
return;
}
mWebSocketManager.wsRegister();
mDecoder.start();
mOutputThread = new OutputThread();
mOutputThread.start();
}
@Override
public void surfaceChanged(SurfaceHolder surfaceHolder, int i, int i1, int i2) {
}
@Override
public void surfaceDestroyed(SurfaceHolder surfaceHolder) {
}
});
}
private void feedDecoder(byte[] n, int len) {
for (; ; ) {
try {
int inputBufferIndex = mDecoder.dequeueInputBuffer(0);
if (inputBufferIndex >= 0) {
final ByteBuffer inputBuffer = mDecoder.getInputBuffer(inputBufferIndex);
inputBuffer.put(n, 0, len);
mDecoder.queueInputBuffer(inputBufferIndex, 0, len, System.currentTimeMillis(), 0);
break;
}
} catch (Exception e) {
Log.d(TAG, e.toString());
}
}
}
private void parseDatagram(byte[] p, int plen) {
try {
for (int i = 0; i < plen; ++i) {
mNalData[mNalDataPos++] = p[i];
if (mNalDataPos == MAX_NAL_LEN - 1) {
mNalDataPos = 0;
}
switch (mSearchState) {
case 0:
case 1:
case 2:
if (p[i] == 0)
mSearchState++;
else
mSearchState = 0;
break;
case 3:
if (p[i] == 1) {
mNalData[0] = 0;
mNalData[1] = 0;
mNalData[2] = 0;
mNalData[3] = 1;
feedDecoder(mNalData, mNalDataPos - 4);
mNalDataPos = 4;
}
mSearchState = 0;
break;
default:
break;
}
}
} catch (Exception e) {
Log.d(TAG, e.toString());
}
}
private boolean isSPSUnit(final ByteBuffer unit) {
return unit.get(4) == 0x67;
}
private class OutputThread extends Thread {
@Override
public void run() {
while (true) {
try {
int outputBufferIndex = mDecoder.dequeueOutputBuffer(mInfo, 10);
if (outputBufferIndex >= 0) {
mDecoder.releaseOutputBuffer(outputBufferIndex, true);
}
} catch (Exception e) {
Log.d(TAG, e.toString());
}
}
}
}
I tested the code on Sony Xperia Z5 Compact and Yota Phone 2, and it works fine on these devices. The picture that I got from Sony is really good . Then I tried the video streamer on Nexus 9 and Nexus 7 devices, but it looks like a row moving from top to bottom. There is no correct output on Nexus devices: nexus results .
I know that it depends on native android media codec, but what should I do to resolve the problem and be able to show video on all devices?
不要将0x00 0x00 0x00 0x01
NALU起始代码传递给解码器。
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