在OSX AVAudioSession替代获得音频驱动程序采样率 [英] AVAudioSession alternative on OSX to get audio driver sample rate

问题描述

在IOS可以使用 [AVAudioSession sharedInstance] SAMPLERATE]; 来检索音频驱动程序当前使用的采样率。 AVAudioSession不OSX上存在的，所以我想知道如何来实现同样的事情在OSX，因为我找不到太多的话题。

on IOS you can use [[AVAudioSession sharedInstance] sampleRate]; to retrieve the current sample rate used by the audio driver. AVAudioSession does not exist on OSX, so I am wondering how to achieve the same thing on OSX, as I could not find much on the topic.

感谢

推荐答案

好吧，

经过一番更深入的研究的音频硬件服务的似乎做OSX的伎俩。下面是一些例子code：

after some more in depth research Audio Hardware Services seems to do the trick on OSX. Here is some example code:

//get the default output device
AudioObjectPropertyAddress addr;
UInt32 size;
addr.mSelector = kAudioHardwarePropertyDefaultOutputDevice;
addr.mScope = kAudioObjectPropertyScopeGlobal;
addr.mElement = 0;
size = sizeof(AudioDeviceID);
err = AudioHardwareServiceGetPropertyData(kAudioObjectSystemObject, &addr, 0, NULL, &size, &deviceID);

//get its sample rate
addr.mSelector = kAudioDevicePropertyNominalSampleRate;
addr.mScope = kAudioObjectPropertyScopeGlobal;
addr.mElement = 0;
size = sizeof(Float64);
Float64 outSampleRate;
err = AudioHardwareServiceGetPropertyData(deviceID, &addr, 0, NULL, &size, &outSampleRate);
//if there is no error, outSampleRate contains the sample rate

不幸的是，不是那么容易的IOS版本，但做这项工作！这会给你的采样率设置，您可以在OSX改变的音频与MIDI设置的

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