Aplayer怎么用SoundTouch对音频实时变调？ [复制链接]

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离线xyc0714

只看楼主倒序阅读使用道具楼主发表于: 2017-05-26

EXPORT_FUNCTION void APlayerPluginAudioFrame(AUDIO_FRAME_INFO * pFrame)
{
HANDLE mSoundTouch = soundtouch_createInstance();//初始化对象
soundtouch_setChannels(mSoundTouch,1);//设置声道
soundtouch_setSampleRate(mSoundTouch, pFrame->bit_per_sample);//设置采样频率
soundtouch_setPitchSemiTones(mSoundTouch, 10);//设置音调
auto len = pFrame->sample_count * pFrame->bit_per_sample;
float *touch_buffer = new float[len];
for (int i = 0; i < len; i++)
{
touch_buffer[i] = (short)((pFrame->frame[i] + 0x80) << 8); //这里不知道怎么写
}
soundtouch_putSamples(mSoundTouch, touch_buffer, len);
int receiveCount = 0;
int pcm_data_size = 0;
do
{
// 接收处理后的sample
receiveCount = soundtouch_receiveSamples(mSoundTouch, touch_buffer, len);
for (int i = 0; i < receiveCount; i++)
{
pFrame->frame[pcm_data_size] = (BYTE)(((short)touch_buffer[i] >> 8) - 0x80);//这里不知道怎么写
pcm_data_size++;
}
} while (receiveCount != 0);
soundtouch_flush(mSoundTouch);
do
{
// 接收处理后的sample
receiveCount = soundtouch_receiveSamples(mSoundTouch, touch_buffer, len);
for (int i = 0; i < receiveCount; i++)
{
pFrame->frame[pcm_data_size] = (BYTE)(((short)touch_buffer[i] >> 8) - 0x80);//这里不知道怎么写
pcm_data_size++;
}
} while (receiveCount != 0);
pFrame->sample_count = pcm_data_size / pFrame->bit_per_sample;
delete[](touch_buffer);
}

Aplayer插件的导出函数输出的数据是一个char型8位数据，而SoundTouch要的是16位的float型的音频数据，两者不兼容，不但调没变，还搞出一堆杂音，不知如何处理。


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