AudioUnitInitialize返回-10851(kAudioUnitErr_InvalidPropertyValue) [英] AudioUnitInitialize returns -10851 (kAudioUnitErr_InvalidPropertyValue)

问题描述

假设代码是:

...
status = AudioUnitSetProperty(
    unit,
    kAudioUnitProperty_StreamFormat,
    kAudioUnitScope_Input, element,
    &format,
    sizeof(AudioStreamBasicDescription));
...
status = AudioUnitInitialize(unit);

错误显示在AudioUnitInitialize中，返回kAudioUnitErr_InvalidPropertyValue，并且在调试器控制台中显示以下消息:

The error manifests in AudioUnitInitialize returning kAudioUnitErr_InvalidPropertyValue and the following message being printed in the debugger console:

[pool] <aurioc> 806: failed: -10851 (enable 2, outf< 2 ch,  48000 Hz, Int16, inter> inf< 2 ch,      0 Hz, Float32, non-inter>)

如果您还为kAudioUnitScope_Input设置了流格式，则此消息的变体为:

If you've set a stream format for kAudioUnitScope_Input as well, then a variation of this message will be:

[pool] <aurioc> 806: failed: -10851 (enable 2, outf< 2 ch,  48000 Hz, Int16, inter> inf< 2 ch,  48000 Hz, Int16, inter>)

推荐答案

错误代码-10851对应kAudioUnitErr_InvalidPropertyValue.

Error code -10851 corresponds to kAudioUnitErr_InvalidPropertyValue.

显然，可以通过在执行AudioUnitInitialize之前执行以下初始化来解决错误:

Apparently, the error is solved by performing this initialization before doing AudioUnitInitialize:

AVAudioSession *mySession = [AVAudioSession sharedInstance];
[mySession setCategory: AVAudioSessionCategoryPlayAndRecord error:nil];

此外，Apple建议设置您打算在整个应用程序中使用的采样率:

Additionally, Apple recommends setting the sampling rate that you intend to use throughout the app:

[mySession setPreferredSampleRate:audio_sample_rate error:nil];
// make sure we got what we wanted
audio_sample_rate = [mySession sampleRate];

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