一个基于Sonic(声音处理算法)的,音频Speed,Pitch,Rate调节Demo 该Demo支持音频打开方式后直接可进行相关音频参数的调节, 或者手动选择本地音频,或者直接播放本Demo内置音频, 要播放在线音频可手动修改源码音频Uri 

该Demo支持两种媒体引擎,都支持音频的变速功能. 一个是,基于Exo和Sonic Java算法 另一个是,基于Presto和Sonic C算法 ----------- 另外界面部分中 含有一个PlusMinusNum自定义控件 支持数字的累加/递减(float/int:需要自己再修改) 支持长按连续累加/递减..... 

protected boolean processOutputBuffer(long positionUs, long elapsedRealtimeUs, MediaCodec codec, ByteBuffer buffer, int bufferIndex, int bufferFlags, long bufferPresentationTimeUs, boolean shouldSkip) throws ExoPlaybackException { if (bufferIndex != this.bufferIndex) { this.bufferIndex = bufferIndex; if ((speed != 1.0f || pitch != 1.0f || rate != 1.0f) && initSonic(buffer.remaining())) { // =========@Sonic@========= int sonicProcessingSize; int position = buffer.position(); // =========@Get the data and processing sonicProcessingSize = buffer.remaining(); buffer.get(sonicBuffer, 0, sonicProcessingSize); sonic.writeBytesToStream(sonicBuffer, sonicProcessingSize); sonicProcessingSize = sonic.readBytesFromStream(sonicBuffer, sonicBuffer.length); // =========@Put the sonic processing data if (!buffer.isReadOnly()) { buffer.position(position); buffer.limit(position + sonicProcessingSize); buffer.put(sonicBuffer, 0, sonicProcessingSize); buffer.position(position); } else {//Use bufferSub replace buffer if (bufferSub == null || bufferSub.capacity() != sonicBuffer.length) bufferSub = ByteBuffer.wrap(sonicBuffer, 0, 0); bufferSub.position(0); bufferSub.limit(sonicProcessingSize); } } else if (bufferSub != null) bufferSub = null; } if (bufferSub != null && buffer.isReadOnly()) buffer = bufferSub; return super.processOutputBuffer(positionUs, elapsedRealtimeUs, codec, buffer, bufferIndex, bufferFlags, bufferPresentationTimeUs, shouldSkip); } 

直接引用K-Sonic项目中的library library-exo: minSdkVer:JELLY_BEAN(16), SDK_INT<23 构建SonicMediaCodecAudioRenderer 实现<23兼容加速 library-presto: minSdkVer:GINGERBREAD(9), MediaExtractor MediaCodec Sonic 实现加速播放 

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