如何使音频设备UID传递到NSSound的setPlaybackDeviceIdentifier中: [英] how to get Audio Device UID to pass into NSSound's setPlaybackDeviceIdentifier:

问题描述

如何获取音频设备UID(USB扬声器)以传递到NSSound的setPlaybackDeviceIdentifier:方法

How can i get audio device UID (USB speaker) to pass into NSSound's setPlaybackDeviceIdentifier: method

谢谢

推荐答案

好的，我自己得到了...

ok i got it myself...

theCFString将包含设备UID

the theCFString will contain the device UID

UInt32          theSize;
char            theString[kMaxStringSize];
UInt32          theNumberDevices;
AudioDeviceID   *theDeviceList = NULL;
UInt32          theDeviceIndex;
CFStringRef     theCFString     = NULL;
OSStatus        theStatus = noErr;

// this is our driver
const char      *nameString = "Burr-Brown Japan PCM2702";
const char      *manufacturerString = "Burr-Brown Japan";



// device list size
theSize = 0;
theStatus = AudioHardwareGetPropertyInfo(kAudioHardwarePropertyDevices, &theSize, NULL);


theNumberDevices = theSize / sizeof(AudioDeviceID);

// allocate the device list
theDeviceList = (AudioDeviceID*)malloc(theNumberDevices * sizeof(AudioDeviceID));

// get the device list
theSize = theNumberDevices * sizeof(AudioDeviceID);
theStatus = AudioHardwareGetProperty(kAudioHardwarePropertyDevices, &theSize, theDeviceList);

// iterate through the device list, find our device and return the UID
for(theDeviceIndex = 0; theDeviceIndex < theNumberDevices; ++theDeviceIndex)
{
    // get name
    theSize = kMaxStringSize;
    theStatus = AudioDeviceGetProperty(theDeviceList[theDeviceIndex],
                                       0, 0, kAudioDevicePropertyDeviceName, &theSize, theString);

    NSLog(@"%s",theString);


    // is it me?
    if (strncmp(theString, nameString, strlen(nameString)) == 0) {

        // get manufacturer
        theSize = kMaxStringSize;
        theStatus = AudioDeviceGetProperty(theDeviceList[theDeviceIndex], 0, 0,
                                           kAudioDevicePropertyDeviceManufacturer, &theSize, theString);

        NSLog(@"%s",theString);
        // is it really me?
        if (strncmp(theString, manufacturerString, strlen(manufacturerString)) == 0) {
            // get device UID
            theSize = sizeof(CFStringRef);
            theStatus = AudioDeviceGetProperty(theDeviceList[theDeviceIndex],
                                               0, 0, kAudioDevicePropertyDeviceUID, &theSize, &theCFString);
            NSLog(@"%s",theCFString);



            break;
        }
    }
}

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