是否可以改变音频队列的播放音调
这应该可以在 Mac OS X 上实现，方法是覆盖 AudioStreamBasicDescription 中的采样率，然后创建一个新的输出队列。
我已经能够检索默认采样率并编写一个新的采样率（即用 48000 替换 44100），但这不会导致输出信号发生任何音高变化。
err = AudioFileGetProperty(mAudioFile, kAudioFilePropertyDataFormat, &size, &mDataFormat);
if (err != noErr)
NSLog(@"Couldn't determine the audio file format");
Float64 mySampleRate = mDataFormat.mSampleRate; //the initial rate
if (inRate != 1) {
//write a new value
mDataFormat.mSampleRate = inRate;
//then
err = AudioQueueNewOutput etc.
任何建议将不胜感激。
This is supposed to be possible on Mac OS X by overwriting the sample rate in the AudioStreamBasicDescription then create a new output queue.
I've been able to retrieve the default sample rate and write a new one (ie. replace 44100 with 48000) but this is not resulting in any pitch change in the output signal.
err = AudioFileGetProperty(mAudioFile, kAudioFilePropertyDataFormat, &size, &mDataFormat);
if (err != noErr)
NSLog(@"Couldn't determine the audio file format");
Float64 mySampleRate = mDataFormat.mSampleRate; //the initial rate
if (inRate != 1) {
//write a new value
mDataFormat.mSampleRate = inRate;
//then
err = AudioQueueNewOutput etc.
Any suggestions would be greatly appreciated.
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更改采样率不会改变音频的音高。您可能会认为播放速度较快的内容音调较高。但这是感知而不是现实。
要更改音高，您需要通过数字信号处理 (DSP) 库处理音频数据。或者，看看通过 AudioUnit 运行它：
音频单元编程指南
Changing the sample rate doesn't change the pitch of the audio. You may perceive that something playing back faster has a higher pitch. However that's perception rather than reality.
To change pitch, you'll need to process the audio data through a Digital Signal Processing (DSP) library. Alternatively, take a look at running it through an AudioUnit:
Audio Unit Programming Guide