pa_mac_core.c

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    OSStatus      err = noErr;
    UInt32        count;
    int           i;
    AudioDeviceID tempDeviceID = kAudioDeviceUnknown;
    PaDeviceID    defaultDeviceID = paNoDevice;

    // get the default output device for the HAL
    // it is required to pass the size of the data to be returned
    count = sizeof(tempDeviceID);
    err = AudioHardwareGetProperty( kAudioHardwarePropertyDefaultInputDevice,  &count, (void *) &tempDeviceID);
    if (err != noErr) goto error;
    
    // scan input devices to see which one matches this device
    defaultDeviceID = paNoDevice;
    for( i=LOWEST_INPUT_DEVID; i<=HIGHEST_INPUT_DEVID; i++ )
    {
        DBUG(("PaOSX_QueryDefaultInputDevice: i = %d, aDevId = %ld\n", i, sDeviceInfos[i].audioDeviceID ));
        if( sDeviceInfos[i].audioDeviceID == tempDeviceID )
        {
            defaultDeviceID = i;
            break;
        }
    }
error:
    return defaultDeviceID;
}

/************************************************************************/
static PaDeviceID PaOSX_QueryDefaultOutputDevice( void )
{
    OSStatus      err = noErr;
    UInt32        count;
    int           i;
    AudioDeviceID tempDeviceID = kAudioDeviceUnknown;
    PaDeviceID    defaultDeviceID = paNoDevice;

    // get the default output device for the HAL
    // it is required to pass the size of the data to be returned
    count = sizeof(tempDeviceID);
    err = AudioHardwareGetProperty( kAudioHardwarePropertyDefaultOutputDevice,  &count, (void *) &tempDeviceID);
    if (err != noErr) goto error;
    
    // scan output devices to see which one matches this device
    defaultDeviceID = paNoDevice;
    for( i=LOWEST_OUTPUT_DEVID; i<=HIGHEST_OUTPUT_DEVID; i++ )
    {
        DBUG(("PaOSX_QueryDefaultOutputDevice: i = %d, aDevId = %ld\n", i, sDeviceInfos[i].audioDeviceID ));
        if( sDeviceInfos[i].audioDeviceID == tempDeviceID )
        {
            defaultDeviceID = i;
            break;
        }
    }
error:
    return defaultDeviceID;
}

/******************************************************************/
static PaError PaOSX_QueryDevices( void )
{
    OSStatus err = noErr;
    UInt32   outSize;
    Boolean  outWritable;
    int      numBytes;

    // find out how many Core Audio devices there are, if any
    outSize = sizeof(outWritable);
    err = AudioHardwareGetPropertyInfo(kAudioHardwarePropertyDevices, &outSize, &outWritable);
    if (err != noErr)
    {
        PRINT_ERR("Couldn't get info about list of audio devices", err);
        sSavedHostError = err;
        return paHostError;
    }
        
    // calculate the number of device available
    sNumCoreDevices = outSize / sizeof(AudioDeviceID);

    // Bail if there aren't any devices
    if (sNumCoreDevices < 1)
    {
        PRINT(("No Devices Available"));
        return paHostError;
    }
    
    // make space for the devices we are about to get
    sCoreDeviceIDs =  (AudioDeviceID *)malloc(outSize);

    // get an array of AudioDeviceIDs
    err = AudioHardwareGetProperty(kAudioHardwarePropertyDevices, &outSize, (void *)sCoreDeviceIDs);
    if (err != noErr)
    {
        PRINT_ERR("Couldn't get list of audio device IDs", err);
        sSavedHostError = err;
        return paHostError;
    }

    // Allocate structures to hold device info pointers.
    // There will be a maximum of two Pa devices per Core Audio device, input and/or output.
    numBytes = sNumCoreDevices * 2 * sizeof(PaHostDeviceInfo);
    sDeviceInfos = (PaHostDeviceInfo *) PaHost_AllocateFastMemory( numBytes );
    if( sDeviceInfos == NULL ) return paInsufficientMemory;

    // Scan all the Core Audio devices to see which support input and allocate a
    // PaHostDeviceInfo structure for each one.
    DBUG(("PaOSX_QueryDevices: scan for input ======================\n"));
    PaOSX_ScanDevices( IS_INPUT );
    sNumInputDevices = sNumPaDevices;
    // Now scan all the output devices.
    DBUG(("PaOSX_QueryDevices: scan for output ======================\n"));
    PaOSX_ScanDevices( IS_OUTPUT );
    sNumOutputDevices = sNumPaDevices - sNumInputDevices;

    // Figure out which of the devices that we scanned is the default device.
    sDefaultInputDeviceID = PaOSX_QueryDefaultInputDevice();
    sDefaultOutputDeviceID = PaOSX_QueryDefaultOutputDevice();

    return paNoError;
}


/*************************************************************************/
/* Query a device for its sample rate.
 * @return positive rate or 0.0 on error.
 */
static Float64 PaOSX_GetDeviceSampleRate( AudioDeviceID deviceID, Boolean isInput )
{
    OSStatus  err = noErr;
    AudioStreamBasicDescription formatDesc;
    UInt32    dataSize;
    dataSize = sizeof(formatDesc);
    err = AudioDeviceGetProperty( deviceID, 0, isInput,
        kAudioDevicePropertyStreamFormat, &dataSize, &formatDesc);
    if( err != noErr ) return 0.0;
    else return formatDesc.mSampleRate;
}

/*************************************************************************/
/* Allocate a string containing the device name. */
static char *PaOSX_DeviceNameFromID(AudioDeviceID deviceID, Boolean isInput )
{
    OSStatus err = noErr;
    UInt32  outSize;
    Boolean  outWritable;
    char     *deviceName = nil;
    
    // query size of name
    err =  AudioDeviceGetPropertyInfo(deviceID, 0, isInput, kAudioDevicePropertyDeviceName, &outSize, &outWritable);
    if (err == noErr)
    {
        deviceName =  (char*)malloc( outSize + 1);
        if( deviceName )
        {
            err = AudioDeviceGetProperty(deviceID, 0, isInput, kAudioDevicePropertyDeviceName, &outSize, deviceName);
            if (err != noErr)
                PRINT_ERR("Couldn't get audio device name", err);
        }
    }

    return deviceName;
}

/*************************************************************************
** Scan all of the Core Audio devices to see which support selected
** input or output mode.
** Changes sNumDevices, and fills in sDeviceInfos.
*/
static int PaOSX_ScanDevices( Boolean isInput )
{
    int coreDeviceIndex;
    int result;
    PaHostDeviceInfo  *hostDeviceInfo;
    int numAdded = 0;

    for(  coreDeviceIndex=0; coreDeviceIndex<sNumCoreDevices; coreDeviceIndex++ )
    {
        // try to fill in next PaHostDeviceInfo
        hostDeviceInfo = &sDeviceInfos[sNumPaDevices];
        result = PaOSX_QueryDeviceInfo( hostDeviceInfo, coreDeviceIndex, isInput );
        DBUG(("PaOSX_ScanDevices: paDevId = %d, coreDevId = %d\n", sNumPaDevices, coreDeviceIndex ));
        if( result > 0 )
        {
            sNumPaDevices += 1;  // bump global counter if we got one
            numAdded += 1;
        }
        else if( result < 0 ) return result;
    }
    return numAdded;
}


/*************************************************************************
** Try to fill in the device info for this device.
** Return 1 if a good device that PA can use.
** Return 0 if not appropriate
** or return negative error.
**
*/
static int PaOSX_QueryDeviceInfo( PaHostDeviceInfo *hostDeviceInfo, int coreDeviceIndex, Boolean isInput )
{
    AudioStreamBasicDescription *allStreamFormats;
    AudioStreamBasicDescription formatDesc;
    OSStatus         err;
    UInt32           outSize;
    Boolean          outWritable;
    AudioDeviceID    devID;
    int              numStreamFormats;
    int              maxChannels;
    int              i;
    PaDeviceInfo    *deviceInfo = &hostDeviceInfo->paInfo;

    deviceInfo->structVersion = 1;
    deviceInfo->maxInputChannels = 0;
    deviceInfo->maxOutputChannels = 0;

    deviceInfo->sampleRates = supportedSampleRateRange; // because we use sample rate converter to get continuous rates
    deviceInfo->numSampleRates = -1;

    devID = sCoreDeviceIDs[ coreDeviceIndex ];
    hostDeviceInfo->audioDeviceID = devID;
    DBUG(("PaOSX_QueryDeviceInfo: name = %s\n", PaOSX_DeviceNameFromID( devID, isInput )));
    DBUG(("PaOSX_QueryDeviceInfo: coreDeviceIndex = %d, devID = %d, isInput = %d\n",
        coreDeviceIndex, devID, isInput ));
        
    // Get data format info from the device.
    outSize = sizeof(formatDesc);
    err = AudioDeviceGetProperty(devID, 0, isInput, kAudioDevicePropertyStreamFormat, &outSize, &formatDesc);
    // This just may not be an appropriate device for input or output so leave quietly.
    if( (err != noErr)  || (formatDesc.mChannelsPerFrame == 0) ) goto error;
    
    DBUG(("PaOSX_QueryDeviceInfo: mFormatID = %4s\n", &formatDesc.mFormatID));
    DBUG(("PaOSX_QueryDeviceInfo: mFormatFlags = 0x%x\n", formatDesc.mFormatFlags));
    DBUG(("PaOSX_QueryDeviceInfo: kLinearPCMFormatFlagIsFloat = 0x%x\n", kLinearPCMFormatFlagIsFloat));

    // dmazzoni: all OS X devices support the float32 format.  When we open the
    // device, if it isn't in this format, we will change it at that point.
    deviceInfo->nativeSampleFormats = paFloat32;

    // Determine maximum number of channels supported by looping through
    // all possible supported stream formats

    outSize = 0;
    err = AudioDeviceGetPropertyInfo( devID, 0, isInput,
                                      kAudioDevicePropertyStreamFormats,
                                      &outSize, &outWritable );
    
    allStreamFormats = (AudioStreamBasicDescription *)malloc(outSize);
    numStreamFormats = outSize / sizeof(AudioStreamBasicDescription);
    err = AudioDeviceGetProperty( devID, 0, isInput,
                                  kAudioDevicePropertyStreamFormats,
                                  &outSize, allStreamFormats);
    
    DBUG(("%d supported formats!\n", numStreamFormats));
    maxChannels = 0;
    for(i=0; i<numStreamFormats; i++) {
        DBUG(("Format %d: formatID=%4s flags=0x%x channels=%d rate=%.0f\n",
              i,
              &allStreamFormats[i].mFormatID,
              allStreamFormats[i].mFormatFlags,
              allStreamFormats[i].mChannelsPerFrame,
              allStreamFormats[i].mSampleRate));
        
        if (allStreamFormats[i].mChannelsPerFrame > maxChannels)
            maxChannels = allStreamFormats[i].mChannelsPerFrame;
    }
    
    free(allStreamFormats);


    #if 0
    memset( &formatDesc, 0, sizeof(formatDesc));
    formatDesc.mChannelsPerFrame = 256; // FIXME - what about device with > 256 channels
    formatDesc.mFormatID = kAudioFormatLinearPCM;
    formatDesc.mFormatFlags =
       kAudioFormatFlagIsFloat |
       kAudioFormatFlagIsBigEndian |
       kAudioFormatFlagIsPacked;
    outSize = sizeof(formatDesc);
    err = AudioDeviceGetProperty( devID, 0,
        isInput, kAudioDevicePropertyStreamFormatMatch, &outSize, &formatDesc);
    if( err != noErr )
    {
        PRINT_ERR("PaOSX_QueryDeviceInfo: Could not get device format match", err);
        sSavedHostError = err;
        return paHostError;
    }
    #endif

    if( isInput )
    {
        deviceInfo->maxInputChannels = maxChannels;
    }
    else
    {
        deviceInfo->maxOutputChannels = maxChannels;
    }

    // Get the device name
    deviceInfo->name = PaOSX_DeviceNameFromID( devID, isInput );
    return 1;

    DBUG(("\n"));

error:
    return 0;
}

/**********************************************************************/
static PaError PaOSX_MaybeQueryDevices( void )
{
    if( sNumPaDevices == 0 )
    {
        return PaOSX_QueryDevices();
    }
    return 0;
}

static char zeroPad[256] = { 0 };

/**********************************************************************
** This is the proc that supplies the data to the AudioConverterFillBuffer call.
** We can pass back arbitrarily sized blocks so if the FIFO region is split
** just pass back the first half.
*/
static OSStatus PaOSX_InputConverterCallbackProc (AudioConverterRef			inAudioConverter,
								UInt32*						outDataSize,
								void**						outData,
								void*						inUserData)
{
    internalPortAudioStream   *past = (internalPortAudioStream *) inUserData;
    PaHostSoundControl *pahsc = (PaHostSoundControl *) past->past_DeviceData;
    void *dataPtr1;
    long size1;
    void *dataPtr2;
    long size2;
           
    /* Pass contiguous region from FIFO directly to converter. */
    RingBuffer_GetReadRegions( &pahsc->ringBuffer, *outDataSize,
            &dataPtr1, &size1, &dataPtr2, &size2 );