Android音轨改变音高而不是速度

Question

嗨，伙计们，我正试图在播放时改变声音的音高。

我正在使用Audio Track。

public void start() {
    if (isPlaying()) {
        return;
    }
    mKeepPlaying = true;
    mAudioTrack.flush();
    if(mAudioTrack != null)
    {
        mAudioTrack.setPlaybackRate(44100);
        mAudioTrack.play();
        // Setting thread feeding the audio samples to the audio hardware.
        // (Assumes mChannels = 1 or 2).
        mPlayThread = new Thread()
        {
            public void run() {
                int position = mPlaybackStart * mChannels;
                mSamples.position(position);
                int limit = mNumSamples * mChannels;
                while (mSamples.position() < limit && mKeepPlaying)
                {
                    int numSamplesLeft = limit - mSamples.position();
                    if (numSamplesLeft >= mBuffer.length)
                    {
                        mSamples.get(mBuffer);
                    } else
                    {
                        for (int i = numSamplesLeft; i < mBuffer.length; i++)
                        {
                            mBuffer[i] = 0;
                        }
                        mSamples.get(mBuffer, 0, numSamplesLeft);
                    }
                    // TODO(nfaralli): use the write method that takes a ByteBuffer as argument.
                    mAudioTrack.write(mBuffer, 0, mBuffer.length);


                }
            }
        };

    mPlayThread.start();
    }
}

因此，如果我将setPlayBackRate（）更改为88200，则音高会增加，但声音的速度会增加。如何以与44100相同的速度播放？

我在Google Play上看到的应用，音乐变速器正是我想要的。我希望能够在没有音频改变速度的情况下改变Pitch Octaves +1.00或-1.00