Awesome

K-Sonic

Based on Sonic (speed , pitch and rate) , the demo for Android

Introduction

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

Features

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.....

CoreCode

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);
}

Usage

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

License

MIT License

Copyright (c) 2017 K Sun <jcodeing@gmail.com>

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.