MediaCodec解码播放手机正常，平板出现绿屏

[笑兮悠扬]

最近在研究MediaCodec解码播放，在手机上能够正常播放，如图
但是在平板上播放的时候就会下面这张图的情况，而且一直显示这个画面，不能正常播放。

public class DecodeActivity extends Activity implements SurfaceHolder.Callback {
	private PlayerThread mPlayer = null;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		SurfaceView sv = new SurfaceView(this);
		sv.getHolder().addCallback(this);
		setContentView(sv);
	}

	protected void onDestroy() {
		super.onDestroy();
	}

	@Override
	public void surfaceCreated(SurfaceHolder holder) {
	}

	@Override
	public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
		if (mPlayer == null) {
			mPlayer = new PlayerThread(holder.getSurface());
			mPlayer.start();
		}
	}

	@Override
	public void surfaceDestroyed(SurfaceHolder holder) {
		if (mPlayer != null) {
			mPlayer.interrupt();
		}
	}
}

public class PlayerThread extends Thread {
	private MediaCodec decoder;
	private Surface surface;

	public PlayerThread(Surface surface) {
		this.surface = surface;
	}

	@SuppressLint("NewApi")
	@TargetApi(Build.VERSION_CODES.JELLY_BEAN)
	@Override
	public void run() {
		
		MediaFormat format = MediaFormat.createVideoFormat("video/avc", 1280, 720);
		try {
			decoder = MediaCodec.createDecoderByType("video/avc");
		} catch (IOException e1) {
			e1.printStackTrace();
		}
		decoder.configure(format, surface, null, 0);

		if (decoder == null) {
			Log.e("DecodeActivity", "Can't find video info!");
			return;
		}

		decoder.start();

		ByteBuffer[] inputBuffers = decoder.getInputBuffers();
		ByteBuffer[] outputBuffers = decoder.getOutputBuffers();
		BufferInfo info = new BufferInfo();
		boolean isEOS = false;
		long startMs = System.currentTimeMillis();

		while (!Thread.interrupted()) {
			FileInputStream fs = null;
			try {
				//fs = new FileInputStream("/storage/sdcard1/test.264");		//手机
				fs = new FileInputStream("/mnt/external_sd/test.264");	//平板
			} catch (FileNotFoundException e1) {
				e1.printStackTrace();
			}
			do {
				if (!isEOS) { //判断是否读取到文件结尾
					int inIndex = decoder.dequeueInputBuffer(10000);
					if (inIndex >= 0) {
						byte[] buffer2 = new byte[4096];
						ByteBuffer buffer = inputBuffers[inIndex];
						int sampleSize = 0;
						try {
							sampleSize = fs.read(buffer2, 0, 4096);
							buffer.clear();
						} catch (IOException e) {
							e.printStackTrace();
						}
						
						if (sampleSize < 0) {
							// We shouldn't stop the playback at this point, just pass the EOS
							// flag to decoder, we will get it again from the
							// dequeueOutputBuffer
							Log.d("DecodeActivity", "InputBuffer BUFFER_FLAG_END_OF_STREAM");
							decoder.queueInputBuffer(inIndex, 0, 0, 0, MediaCodec.BUFFER_FLAG_END_OF_STREAM);
							isEOS = true;
						} else {
							buffer.put(buffer2, 0, sampleSize);
							buffer.clear();
							decoder.queueInputBuffer(inIndex, 0, sampleSize, 0, 0);
						}
					}
				}

				int outIndex = decoder.dequeueOutputBuffer(info, 10000);
				switch (outIndex) {
				case MediaCodec.INFO_OUTPUT_BUFFERS_CHANGED:
					Log.d("DecodeActivity", "INFO_OUTPUT_BUFFERS_CHANGED");
					outputBuffers = decoder.getOutputBuffers();
					break;
				case MediaCodec.INFO_OUTPUT_FORMAT_CHANGED:
					Log.d("DecodeActivity", "New format " + decoder.getOutputFormat());
					break;
				case MediaCodec.INFO_TRY_AGAIN_LATER:
					Log.d("DecodeActivity", "dequeueOutputBuffer timed out!");
					break;
				default:
					ByteBuffer buffer = outputBuffers[outIndex];
					Log.v("DecodeActivity", "We can't use this buffer but render it due to the API limit, " + buffer);

					// We use a very simple clock to keep the video FPS, or the video
					// playback will be too fast
					while (info.presentationTimeUs / 1000 > System.currentTimeMillis() - startMs) {
						try {
							sleep(10);
						} catch (InterruptedException e) {
							e.printStackTrace();
							break;
						}
					}
					decoder.releaseOutputBuffer(outIndex, true);
					break;
				}
			} while (!isEOS);

			// All decoded frames have been rendered, we can stop playing now
			if ((info.flags & MediaCodec.BUFFER_FLAG_END_OF_STREAM) != 0) {
				Log.d("DecodeActivity", "OutputBuffer BUFFER_FLAG_END_OF_STREAM");
				break;
			}
		}

		decoder.stop();
		decoder.release();
	}
}

具体的方法就是主Activity里放一个Surface用来播放视频，然后开启视频解码播放线程。线程里通过每次都读取4K的数据进行播放。在手机上能正常播放，平板中就会出现问题。
求大神帮忙看下这是什么原因。

[笑兮悠扬]

大神呢大神呢，快来帮帮我！

[mw_meng_wei2]

解决了没有啊，大神

[辰月之征]

楼主的平板是哪个牌子啊，我们做的播放器硬解的时候目前在小米和华为上面出现了绿屏现象，其他手机正常。哎，Android兼容性问题搞死人啊

[辰月之征]

if (!isEOS) { //判断是否读取到文件结尾 int inIndex = decoder.dequeueInputBuffer(10000); if (inIndex >= 0) { byte[] buffer2 = new byte[4096]; ByteBuffer buffer = inputBuffers[inIndex]; int sampleSize = 0; try { sampleSize = fs.read(buffer2, 0, 4096); buffer.clear(); } catch (IOException e) { e.printStackTrace(); } if (sampleSize < 0) { // We shouldn't stop the playback at this point, just pass the EOS // flag to decoder, we will get it again from the // dequeueOutputBuffer Log.d("DecodeActivity", "InputBuffer BUFFER_FLAG_END_OF_STREAM"); decoder.queueInputBuffer(inIndex, 0, 0, 0, MediaCodec.BUFFER_FLAG_END_OF_STREAM); isEOS = true; } else { buffer.put(buffer2, 0, sampleSize); buffer.clear(); decoder.queueInputBuffer(inIndex, 0, sampleSize, 0, 0); } } } sampleSize = fs.read(buffer2, 0, 4096);这一句应该读数据的有效长度，你读取了4096，你读了整个缓冲区，如果有一部分是空数据你怎么处理？