VariableSpeedMediaCodecAudioTrackRenderer

VariableSpeedMediaCodecAudioTrackRenderer.java

import android.media.MediaCodec;
import android.media.MediaFormat;

import com.google.android.exoplayer.ExoPlaybackException;
import com.google.android.exoplayer.ExoPlayer;
import com.google.android.exoplayer.MediaCodecAudioTrackRenderer;
import com.google.android.exoplayer.SampleSource;
import com.google.android.exoplayer.util.Util;

import java.nio.ByteBuffer;

import sonic.Sonic;

public class VariableSpeedMediaCodecAudioTrackRenderer extends MediaCodecAudioTrackRenderer {

    private static final int SAMPLES_PER_CODEC_FRAME = 1024;

    private Sonic sonic;
    private byte[] sonicInputBuffer;
    private byte[] sonicOutputBuffer;

    private float narrationSpeed;
    private int lastSeenBufferIndex = -1;
    private ByteBuffer lastInternalBuffer;

    public VariableSpeedEnabledMediaCodecAudioTrackRenderer(final SampleSource source, final float narrationSpeed) {
        super(source);
        this.narrationSpeed = narrationSpeed;
    }

    @Override
    protected boolean processOutputBuffer(final long positionUs, final long elapsedRealtimeUs, final MediaCodec codec, final ByteBuffer buffer,
            final MediaCodec.BufferInfo bufferInfo, final int bufferIndex, final boolean shouldSkip) throws ExoPlaybackException {
        // If this buffer was previously seen that means part, but not all, was consumed by the AudioTrack. Pass it
        // again so the remainder can be consumed.
        if (bufferIndex == lastSeenBufferIndex) {
            return super.processOutputBuffer(positionUs, elapsedRealtimeUs, codec, lastInternalBuffer, bufferInfo, bufferIndex, shouldSkip);
        } else {
            lastSeenBufferIndex = bufferIndex;
        }

        final int bytesToRead;

        if (Util.SDK_INT < 21) {
            buffer.position(0);
            bytesToRead = bufferInfo.size;
        } else {
            bytesToRead = buffer.remaining();
        }

        buffer.get(sonicInputBuffer, 0, bytesToRead);
        sonic.writeBytesToStream(sonicInputBuffer, bytesToRead);
        final int readThisTime = sonic.readBytesFromStream(sonicOutputBuffer, sonicOutputBuffer.length);

        bufferInfo.offset = 0;
        lastInternalBuffer.position(0);

        bufferInfo.size = readThisTime;
        lastInternalBuffer.limit(readThisTime);

        return super.processOutputBuffer(positionUs, elapsedRealtimeUs, codec, lastInternalBuffer, bufferInfo, bufferIndex, shouldSkip);
    }

    @Override
    protected void onOutputFormatChanged(final MediaFormat format) {
        super.onOutputFormatChanged(format);

        final int sampleRate = format.getInteger(MediaFormat.KEY_SAMPLE_RATE);
        final int channelCount = format.getInteger(MediaFormat.KEY_CHANNEL_COUNT);

        // Two samples per frame * 2 to support narration speeds down to 0.5
        final int bufferSizeBytes = SAMPLES_PER_CODEC_FRAME * 2 * 2 * channelCount;

        this.sonicInputBuffer = new byte[bufferSizeBytes];
        this.sonicOutputBuffer = new byte[bufferSizeBytes];
        this.sonic = new Sonic(sampleRate, channelCount);
        this.lastInternalBuffer = ByteBuffer.wrap(sonicOutputBuffer, 0, 0);
        setSpeedInternal(narrationSpeed);
    }

    private synchronized void setSpeedInternal(final float narrationSpeed) {
        this.narrationSpeed = narrationSpeed;
        this.sonic.setSpeed(narrationSpeed);
    }
}

hello, can you help me ?
Sometimes I had such a problem:
I/ExoPlayerImpl(23722): Init 1.5.9
ExoPlayerImplInternal(23722): Internal runtime error.
E/ExoPlayerImplInternal(23722): java.lang.IndexOutOfBoundsException: offset=0, count=42812, length=4096
E/ExoPlayerImplInternal(23722): at java.nio.Buffer.checkGetBounds(Buffer.java:167)
E/ExoPlayerImplInternal(23722): at java.nio.DirectByteBuffer.get(DirectByteBuffer.java:114)
E/ExoPlayerImplInternal(23722): at com.*.media.r.a(VariableSpeedMediaCodecAudioTrackRenderer.java:63)
E/ExoPlayerImplInternal(23722): at com.google.android.exoplayer.s.b(MediaCodecTrackRenderer.java:915)
E/ExoPlayerImplInternal(23722): at com.google.android.exoplayer.s.a(MediaCodecTrackRenderer.java:512)
E/ExoPlayerImplInternal(23722): at com.google.android.exoplayer.z.a(SampleSourceTrackRenderer.java:129)
E/ExoPlayerImplInternal(23722): at com.google.android.exoplayer.l.e(ExoPlayerImplInternal.java:434)
E/ExoPlayerImplInternal(23722): at com.google.android.exoplayer.l.handleMessage(ExoPlayerImplInternal.java:213)
E/ExoPlayerImplInternal(23722): at android.os.Handler.dispatchMessage(Handler.java:106)
E/ExoPlayerImplInternal(23722): at android.os.Looper.loop(Looper.java:229)
E/ExoPlayerImplInternal(23722): at android.os.HandlerThread.run(HandlerThread.java:61)
E/ExoPlayerImplInternal(23722): at com.google.android.exoplayer.k.t.run(PriorityHandlerThread.java:40)