播放音频倒退 [英] Playing audio backwards

问题描述

您好我想在Android的倒退播放音频。我如何做到的呢？任何指针将AP preciated。谢谢你。

Hi I'd like to play audio backwards in Android. How do I accomplish it? Any pointers will be appreciated. Thanks.

推荐答案

有可能不是在API来这样的功能。

there probably isn't a functionality in the apis for this.

但是，它很容易向后播放PCM音频数据。

however, it's quite easy to play pcm audio data backwards.

用c ++风格的伪code进行演示：

a demonstration using c++ style pseudo-code:

/* assuming 1 channel (mono), 16 bit LPCM */
const int16_t* const audioFileBuffer = audioFile.audioBuffer();

/* forward */
for (int idx = 0, sampleCount = audioFile.sampleCount(); idx < sampleCount; ++idx) {
    outputBuffer[idx] = audioFileBuffer[idx];
}

/* reverse */
for (int idx = 0, sampleCount = audioFile.sampleCount(), read = audioFile.sampleCount() - 1; idx < sampleCount; ++idx, --read) {
    outputBuffer[idx] = audioFileBuffer[read];
}

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