如何从CoreAudio获取首选通道布局

#include <CoreAudio/CoreAudio.h>

void GetPreferredChannelLayout()
{
    AudioObjectPropertyAddress propertyAddress;
    AudioObjectID deviceID;
    UInt32 dataSize;
    OSStatus status;

    // 获取默认音频设备的ID
    propertyAddress.mSelector = kAudioHardwarePropertyDefaultOutputDevice;
    propertyAddress.mScope = kAudioObjectPropertyScopeGlobal;
    propertyAddress.mElement = kAudioObjectPropertyElementMaster;
    dataSize = sizeof(deviceID);
    status = AudioObjectGetPropertyData(kAudioObjectSystemObject, &propertyAddress, 0, NULL, &dataSize, &deviceID);

    if (status != noErr) {
        // 错误处理
        return;
    }

    // 获取首选通道布局属性的大小
    propertyAddress.mSelector = kAudioDevicePropertyPreferredChannelLayout;
    propertyAddress.mScope = kAudioObjectPropertyScopeOutput;
    propertyAddress.mElement = kAudioObjectPropertyElementMaster;
    dataSize = 0;
    status = AudioObjectGetPropertyDataSize(deviceID, &propertyAddress, 0, NULL, &dataSize);

    if (status != noErr) {
        // 错误处理
        return;
    }

    // 获取首选通道布局
    AudioChannelLayout* channelLayout = (AudioChannelLayout*)malloc(dataSize);
    status = AudioObjectGetPropertyData(deviceID, &propertyAddress, 0, NULL, &dataSize, channelLayout);

    if (status != noErr) {
        // 错误处理
        free(channelLayout);
        return;
    }

    // 解析首选通道布局
    UInt32 channelCount = channelLayout->mNumberChannelDescriptions;
    // 其他解析通道布局的操作...

    // 释放内存
    free(channelLayout);
}