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MediaCodec encoder sample
package com.opentok.media.avc;
import java.io.IOException;
import java.nio.ByteBuffer;
import android.media.MediaCodec;
import android.media.MediaCodecInfo;
import android.media.MediaFormat;
public class AvcEncoder {
private EncodedFrameListener frameListener;
private MediaCodec mediaCodec;
private byte[] sps;
private byte[] pps;
private ParameterSetsListener parameterSetsListener;
public AvcEncoder() {
mediaCodec = MediaCodec.createEncoderByType("video/avc");
MediaFormat mediaFormat = MediaFormat.createVideoFormat("video/avc", 320, 240);
mediaFormat.setInteger(MediaFormat.KEY_BIT_RATE, 125000);
mediaFormat.setInteger(MediaFormat.KEY_FRAME_RATE, 15);
mediaFormat.setInteger(MediaFormat.KEY_COLOR_FORMAT, MediaCodecInfo.CodecCapabilities.COLOR_FormatYUV420Planar);
mediaFormat.setInteger(MediaFormat.KEY_I_FRAME_INTERVAL, 5);
mediaCodec.configure(mediaFormat, null, null, MediaCodec.CONFIGURE_FLAG_ENCODE);
mediaCodec.start();
}
@Override
public void close() throws IOException {
mediaCodec.stop();
mediaCodec.release();
}
@Override
public void offerEncoder(byte[] input) {
try {
ByteBuffer[] inputBuffers = mediaCodec.getInputBuffers();
ByteBuffer[] outputBuffers = mediaCodec.getOutputBuffers();
int inputBufferIndex = mediaCodec.dequeueInputBuffer(-1);
if (inputBufferIndex >= 0) {
ByteBuffer inputBuffer = inputBuffers[inputBufferIndex];
inputBuffer.clear();
inputBuffer.put(input);
mediaCodec.queueInputBuffer(inputBufferIndex, 0, input.length, 0, 0);
}
MediaCodec.BufferInfo bufferInfo = new MediaCodec.BufferInfo();
int outputBufferIndex = mediaCodec.dequeueOutputBuffer(bufferInfo, 0);
while (outputBufferIndex >= 0) {
ByteBuffer outputBuffer = outputBuffers[outputBufferIndex];
byte[] outData = new byte[bufferInfo.size];
outputBuffer.get(outData);
if (sps != null && pps != null) {
ByteBuffer frameBuffer = ByteBuffer.wrap(outData);
frameBuffer.putInt(bufferInfo.size - 4);
frameListener.frameReceived(outData, 0, outData.length);
} else {
ByteBuffer spsPpsBuffer = ByteBuffer.wrap(outData);
if (spsPpsBuffer.getInt() == 0x00000001) {
System.out.println("parsing sps/pps");
} else {
System.out.println("something is amiss?");
}
int ppsIndex = 0;
while(!(spsPpsBuffer.get() == 0x00 && spsPpsBuffer.get() == 0x00 && spsPpsBuffer.get() == 0x00 && spsPpsBuffer.get() == 0x01)) {
}
ppsIndex = spsPpsBuffer.position();
sps = new byte[ppsIndex - 8];
System.arraycopy(outData, 4, sps, 0, sps.length);
pps = new byte[outData.length - ppsIndex];
System.arraycopy(outData, ppsIndex, pps, 0, pps.length);
if (null != parameterSetsListener) {
parameterSetsListener.avcParametersSetsEstablished(sps, pps);
}
}
mediaCodec.releaseOutputBuffer(outputBufferIndex, false);
outputBufferIndex = mediaCodec.dequeueOutputBuffer(bufferInfo, 0);
}
} catch (Throwable t) {
t.printStackTrace();
}
}
}
@GulaSoft

Hello!
what is this:
EncodedFrameListener frameListener;
and te
ParameterSetsListener parameterSetsListener?

@XimingCheng

I amconfused on EncodedFrameListener and ParameterSetsListener, is it the private Listener which is not provided by the Android SDK?

@npakudin

It seems, author means custom class

public class EncodedFrameListener {
    public void frameReceived(byte[] data, int pos, int length) {

    }
}

http://dev.naver.com/projects/nextcinema/code/MediaCodecSample/src/com/TestGroup/mediacodecsample/view/EncodedFrameListener.java?branch=develop

@poojalikop

Hi npakudin,
This page is in Korean. Can you please give more details about EncodedFrameListener. Thanks in advance.

@hpp

I found this example very useful, thanks wobbals!

EncodedFrameListener is just a listener for when a new frame has been encoded. In my case I would just open the file being written to and write in the new frame information.

ParameterSetsListener is just a listener that updates some parameters.

@Bmackenzie

Super old thread but I am having bit of an issue. when offering the data I get the following error:
Attempt to invoke virtual method 'java.nio.ByteBuffer[] android.media.MediaCodec.getInputBuffers()' on a null object reference

This is the line that produces the error:
ByteBuffer[] inputBuffers = mediaCodec.getInputBuffers();

However, I have checked and recheck...the MediaCodec object is not null. Any assistance is appreciated.

@leye0

How is your MediaCodec object created? The part where you are doing MediaCodec.Create(encoder/decoder)By(type/codecName), and after that? Do you configure it? Do you see errors in the log when executing it line by line?

@Bmackenzie

Thanks for the reply, it's verbatim from the above code with a few more try/catch attempts. It seems that the mediaCodec object is not being created, but there are no errors thrown during it's creation, no errors during configuration. Here is the entire file.

http://pastebin.com/raw.php?i=fm2a02M3

I really appreciate the assist.

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