Created
August 5, 2017 17:24
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render "single I-frame HEVC bitstream" with MediaCodec decoder
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package jp.yohhoy.hevcdec; | |
import android.app.Activity; | |
import android.content.Context; | |
import android.media.MediaCodec; | |
import android.media.MediaFormat; | |
import android.os.Bundle; | |
import android.util.Log; | |
import android.util.Size; | |
import android.view.Surface; | |
import android.view.SurfaceHolder; | |
import android.view.SurfaceView; | |
import android.view.ViewGroup; | |
import java.io.ByteArrayOutputStream; | |
import java.io.IOException; | |
import java.io.InputStream; | |
import java.nio.ByteBuffer; | |
public class MainActivity extends Activity { | |
private static final String TAG = "MainActivity"; | |
private static byte[] loadRawResource(Context ctx, int resId) { | |
int size = (int) ctx.getResources().openRawResourceFd(resId).getLength(); | |
try { | |
byte data[] = new byte[size]; | |
InputStream is = ctx.getResources().openRawResource(resId); | |
is.read(data); | |
return data; | |
} catch (IOException ex) { | |
return null; | |
} | |
} | |
private static MediaCodec findHevcDecoder() { | |
// "video/hevc" may select hardware decoder on the device. | |
// "OMX.google.hevc.decoder" is software decoder. | |
final String[] codecNames = {"video/hevc", "OMX.google.hevc.decoder"}; | |
for (String name : codecNames) { | |
try { | |
MediaCodec codec = MediaCodec.createByCodecName(name); | |
Log.i(TAG, "codec \"" + name + "\" is available"); | |
return codec; | |
} catch (IOException | IllegalArgumentException ex) { | |
Log.d(TAG, "codec \"" + name + "\" not found"); | |
} | |
} | |
Log.w(TAG, "HEVC decoder is not available"); | |
return null; | |
} | |
private static ByteBuffer extractHevcParamSets(byte[] bitstream) { | |
final byte[] startCode = {0x00, 0x00, 0x00, 0x01}; | |
int nalBeginPos = 0, nalEndPos = 0; | |
int nalUnitType = -1; | |
int nlz = 0; | |
ByteArrayOutputStream baos = new ByteArrayOutputStream(); | |
for (int pos = 0; pos < bitstream.length; pos++) { | |
if (2 <= nlz && bitstream[pos] == 0x01) { | |
nalEndPos = pos - nlz; | |
if (nalUnitType == 32 || nalUnitType == 33 || nalUnitType == 34) { | |
// extract VPS(32), SPS(33), PPS(34) | |
Log.d(TAG, "NUT=" + nalUnitType + " range={" + nalBeginPos + "," + nalEndPos + "}"); | |
try { | |
baos.write(startCode); | |
baos.write(bitstream, nalBeginPos, nalEndPos - nalBeginPos); | |
} catch (IOException ex) { | |
Log.e(TAG, "extractHevcParamSets", ex); | |
return null; | |
} | |
} | |
nalBeginPos = ++pos; | |
nalUnitType = (bitstream[pos] >> 1) & 0x2f; | |
if (0 <= nalUnitType && nalUnitType <= 31) { | |
break; // VCL NAL; no more VPS/SPS/PPS | |
} | |
} | |
nlz = (bitstream[pos] != 0x00) ? 0 : nlz + 1; | |
} | |
return ByteBuffer.wrap(baos.toByteArray()); | |
} | |
private static Size calcImageSize(MediaFormat format) { | |
int cropLeft = format.getInteger("crop-left"); | |
int cropRight = format.getInteger("crop-right"); | |
int cropTop = format.getInteger("crop-top"); | |
int cropBottom = format.getInteger("crop-bottom"); | |
int width = cropRight + 1 - cropLeft; | |
int height = cropBottom + 1 - cropTop; | |
return new Size(width, height); | |
} | |
private static Size renderHevcImage(byte[] bitstream, Surface surface) { | |
MediaCodec decoder = findHevcDecoder(); | |
if (decoder == null) { | |
return null; | |
} | |
// configure HEVC decoder | |
MediaFormat inputFormat = MediaFormat.createVideoFormat("video/hevc", 640, 480); | |
inputFormat.setInteger(MediaFormat.KEY_MAX_INPUT_SIZE, bitstream.length); | |
inputFormat.setByteBuffer("csd-0", extractHevcParamSets(bitstream)); | |
Log.d(TAG, "input-format=" + inputFormat); | |
decoder.configure(inputFormat, surface, null, 0); | |
MediaFormat outputFormat = decoder.getOutputFormat(); | |
Log.d(TAG, "output-format=" + outputFormat); | |
Size imageSize = calcImageSize(outputFormat); | |
decoder.start(); | |
// set bitstream to decoder | |
int inputBufferId = decoder.dequeueInputBuffer(-1); | |
if (inputBufferId < 0) { | |
Log.e(TAG, "dequeueInputBuffer return " + inputBufferId); | |
return null; | |
} | |
ByteBuffer inBuffer = decoder.getInputBuffer(inputBufferId); | |
inBuffer.put(bitstream); | |
decoder.queueInputBuffer(inputBufferId, 0, bitstream.length, 0, 0); | |
// notify end of stream | |
inputBufferId = decoder.dequeueInputBuffer(-1); | |
if (inputBufferId < 0) { | |
Log.e(TAG, "dequeueInputBuffer return " + inputBufferId); | |
return null; | |
} | |
decoder.queueInputBuffer(inputBufferId, 0, 0, 0, MediaCodec.BUFFER_FLAG_END_OF_STREAM); | |
// get decoded image | |
MediaCodec.BufferInfo bufferInfo = new MediaCodec.BufferInfo(); | |
while (true) { | |
int outputBufferId = decoder.dequeueOutputBuffer(bufferInfo, -1); | |
if (outputBufferId >= 0) { | |
decoder.releaseOutputBuffer(outputBufferId, true); | |
break; | |
} else if (outputBufferId == MediaCodec.INFO_OUTPUT_FORMAT_CHANGED) { | |
outputFormat = decoder.getOutputFormat(); | |
Log.d(TAG, "output-format=" + outputFormat); | |
imageSize = calcImageSize(outputFormat); | |
} else { | |
Log.d(TAG, "dequeueOutputBuffer return " + outputBufferId); | |
} | |
} | |
decoder.flush(); | |
decoder.stop(); | |
decoder.release(); | |
return imageSize; | |
} | |
private SurfaceView mSurfaceView; | |
@Override | |
protected void onCreate(Bundle savedInstanceState) { | |
super.onCreate(savedInstanceState); | |
mSurfaceView = new SurfaceView(this); | |
setContentView(mSurfaceView); | |
// load HEVC bitstream (Annex.B format) | |
final byte[] bitstream = loadRawResource(this, R.raw.lena_std); | |
Log.d(TAG, "length=" + bitstream.length); | |
mSurfaceView.getHolder().addCallback(new SurfaceHolder.Callback() { | |
@Override | |
public void surfaceCreated(SurfaceHolder holder) { | |
} | |
@Override | |
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { | |
Log.d(TAG, "surfaceChanged format=" + format + " size=" + width + "x" + height); | |
Size sz = renderHevcImage(bitstream, holder.getSurface()); | |
if (sz != null) { | |
// fit SurfaceView to decoded image | |
ViewGroup.LayoutParams lp = mSurfaceView.getLayoutParams(); | |
lp.width = sz.getWidth(); | |
lp.height = sz.getHeight(); | |
mSurfaceView.setLayoutParams(lp); | |
} | |
} | |
@Override | |
public void surfaceDestroyed(SurfaceHolder holder) { | |
} | |
}); | |
} | |
} |
Author
yohhoy
commented
Aug 5, 2017
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