Method GetPropertyData

proxyAudioDevice/ProxyAudioDevice.cpp:952–1056

}

OSStatus ProxyAudioDevice::GetPropertyData(AudioServerPlugInDriverRef inDriver,
                                           AudioObjectID inObjectID,
                                           pid_t inClientProcessID,
                                           const AudioObjectPropertyAddress *inAddress,
                                           UInt32 inQualifierDataSize,
                                           const void *inQualifierData,
                                           UInt32 inDataSize,
                                           UInt32 *outDataSize,
                                           void *outData) {
    //    declare the local variables
    OSStatus theAnswer = 0;

    //    check the arguments
    FailWithAction(inDriver != gAudioServerPlugInDriverRef,
                   theAnswer = kAudioHardwareBadObjectError,
                   Done,
                   "GetPropertyData: bad driver reference");
    FailWithAction(
        inAddress == NULL, theAnswer = kAudioHardwareIllegalOperationError, Done, "GetPropertyData: no address");
    FailWithAction(outDataSize == NULL,
                   theAnswer = kAudioHardwareIllegalOperationError,
                   Done,
                   "GetPropertyData: no place to put the return value size");
    FailWithAction(outData == NULL,
                   theAnswer = kAudioHardwareIllegalOperationError,
                   Done,
                   "GetPropertyData: no place to put the return value");

    //    Note that for each object, this driver implements all the required properties plus a few
    //    extras that are useful but not required.
    //
    //    Also, since most of the data that will get returned is static, there are few instances where
    //    it is necessary to lock the state mutex.
    switch (inObjectID) {
        case kObjectID_PlugIn:
            theAnswer = GetPlugInPropertyData(inDriver,
                                              inObjectID,
                                              inClientProcessID,
                                              inAddress,
                                              inQualifierDataSize,
                                              inQualifierData,
                                              inDataSize,
                                              outDataSize,
                                              outData);
            break;

        case kObjectID_Box:
            theAnswer = GetBoxPropertyData(inDriver,
                                           inObjectID,
                                           inClientProcessID,
                                           inAddress,
                                           inQualifierDataSize,
                                           inQualifierData,
                                           inDataSize,
                                           outDataSize,
                                           outData);
            break;