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所以我試圖將着名的smbPitchShift算法集成到我的項目中,但輸入緩衝區和輸出緩衝區是相同的。 smbPitchShift算法不會更改緩衝區中的採樣。iOS smbPitchShift不起作用
這是我在我做渲染後的回調:
OSStatus MyAURenderCallback (void *inRefCon,
AudioUnitRenderActionFlags *ioActionFlags,
const AudioTimeStamp *inTimeStamp,
UInt32 inBusNumber,
UInt32 inNumberFrames,
AudioBufferList *ioData
)
{
if (*ioActionFlags == kAudioUnitRenderAction_PostRender) {
NSLog(@"render");
SBPitchShifter *self = (__bridge SBPitchShifter *)inRefCon;
float *fBuffer = (float *)(malloc(sizeof(float)*inNumberFrames));
int stride = 2;
vDSP_vflt16((SInt16 *)ioData->mBuffers[0].mData, stride, (float *)fBuffer, stride, inNumberFrames);
smbPitchShift(2.0, inNumberFrames, inNumberFrames, 4, self.linearPCMASBD.mSampleRate, fBuffer, fBuffer);
vDSP_vfixr16((float *)fBuffer, stride, (SInt16 *)ioData->mBuffers[0].mData, stride, inNumberFrames);
free(fBuffer);
}
return noErr;
};
播放聲音時就像正常的,因爲在球場將被設置爲1。任何想法? :)
嘗試使用kAudioUnitRenderAction_PreRender並將修改的數據設置爲ioData緩衝區。 –