pa_mac_core.c

一个开源的sip源代码

    if( 0 != AudioHardwareGetProperty(kAudioHardwarePropertyDefaultInputDevice,
                     &size,
                     &auhalHostApi->defaultIn) ) {
       int i;
       auhalHostApi->defaultIn  = kAudioDeviceUnknown;
       VDBUG(("Failed to get default input device from OS."));
       VDBUG((" I will substitute the first available input Device."));
       for( i=0; i<auhalHostApi->devCount; ++i ) {
          PaDeviceInfo devInfo;
          if( 0 != GetChannelInfo( auhalHostApi, &devInfo,
                                   auhalHostApi->devIds[i], TRUE ) )
             if( devInfo.maxInputChannels ) {
                auhalHostApi->defaultIn = auhalHostApi->devIds[i];
                break;
             }
       }
    }   
    if( 0 != AudioHardwareGetProperty(kAudioHardwarePropertyDefaultOutputDevice,
                     &size,
                     &auhalHostApi->defaultOut) ) {
       int i;
       auhalHostApi->defaultIn  = kAudioDeviceUnknown;
       VDBUG(("Failed to get default output device from OS."));
       VDBUG((" I will substitute the first available output Device."));
       for( i=0; i<auhalHostApi->devCount; ++i ) {
          PaDeviceInfo devInfo;
          if( 0 != GetChannelInfo( auhalHostApi, &devInfo,
                                   auhalHostApi->devIds[i], FALSE ) )
             if( devInfo.maxOutputChannels ) {
                auhalHostApi->defaultOut = auhalHostApi->devIds[i];
                break;
             }
       }
    }   

    VDBUG( ( "Default in : %ld\n", auhalHostApi->defaultIn  ) );
    VDBUG( ( "Default out: %ld\n", auhalHostApi->defaultOut ) );

    return paNoError;
}

static PaError GetChannelInfo( PaMacAUHAL *auhalHostApi,
                               PaDeviceInfo *deviceInfo,
                               AudioDeviceID macCoreDeviceId,
                               int isInput)
{
    UInt32 propSize;
    PaError err = paNoError;
    UInt32 i;
    int numChannels = 0;
    AudioBufferList *buflist = NULL;
    UInt32 frameLatency;

    VVDBUG(("GetChannelInfo()\n"));

    /* Get the number of channels from the stream configuration.
       Fail if we can't get this. */

    err = ERR(AudioDeviceGetPropertyInfo(macCoreDeviceId, 0, isInput, kAudioDevicePropertyStreamConfiguration, &propSize, NULL));
    if (err)
        return err;

    buflist = PaUtil_AllocateMemory(propSize);
    if( !buflist )
       return paInsufficientMemory;
    err = ERR(AudioDeviceGetProperty(macCoreDeviceId, 0, isInput, kAudioDevicePropertyStreamConfiguration, &propSize, buflist));
    if (err)
        goto error;

    for (i = 0; i < buflist->mNumberBuffers; ++i)
        numChannels += buflist->mBuffers[i].mNumberChannels;

    if (isInput)
        deviceInfo->maxInputChannels = numChannels;
    else
        deviceInfo->maxOutputChannels = numChannels;
      
    if (numChannels > 0) /* do not try to retrieve the latency if there is no channels. */
    {
       /* Get the latency.  Don't fail if we can't get this. */
       /* default to something reasonable */
       deviceInfo->defaultLowInputLatency = .01;
       deviceInfo->defaultHighInputLatency = .10;
       deviceInfo->defaultLowOutputLatency = .01;
       deviceInfo->defaultHighOutputLatency = .10;
       propSize = sizeof(UInt32);
       err = WARNING(AudioDeviceGetProperty(macCoreDeviceId, 0, isInput, kAudioDevicePropertyLatency, &propSize, &frameLatency));
       if (!err)
       {
          /** FEEDBACK:
           * This code was arrived at by trial and error, and some extentive, but not exhaustive
           * testing. Sebastien Beaulieu <[e-mail]> has suggested using
           * kAudioDevicePropertyLatency + kAudioDevicePropertySafetyOffset + buffer size instead.
           * At the time this code was written, many users were reporting dropouts with audio
           * programs that probably used this formula. This was probably
           * around 10.4.4, and the problem is probably fixed now. So perhaps
           * his formula should be reviewed and used.
           * */
          double secondLatency = frameLatency / deviceInfo->defaultSampleRate;
          if (isInput)
          {
             deviceInfo->defaultLowInputLatency = 3 * secondLatency;
             deviceInfo->defaultHighInputLatency = 3 * 10 * secondLatency;
          }
          else
          {
             deviceInfo->defaultLowOutputLatency = 3 * secondLatency;
             deviceInfo->defaultHighOutputLatency = 3 * 10 * secondLatency;
          }
       }
    }
    PaUtil_FreeMemory( buflist );
    return paNoError;
 error:
    PaUtil_FreeMemory( buflist );
    return err;
}

static PaError InitializeDeviceInfo( PaMacAUHAL *auhalHostApi,
                                     PaDeviceInfo *deviceInfo,
                                     AudioDeviceID macCoreDeviceId,
                                     PaHostApiIndex hostApiIndex )
{
    Float64 sampleRate;
    char *name;
    PaError err = paNoError;
    UInt32 propSize;

    VVDBUG(("InitializeDeviceInfo(): macCoreDeviceId=%ld\n", macCoreDeviceId));

    memset(deviceInfo, 0, sizeof(deviceInfo));

    deviceInfo->structVersion = 2;
    deviceInfo->hostApi = hostApiIndex;

    /* Get the device name.  Fail if we can't get it. */
    err = ERR(AudioDeviceGetPropertyInfo(macCoreDeviceId, 0, 0, kAudioDevicePropertyDeviceName, &propSize, NULL));
    if (err)
        return err;

    name = PaUtil_GroupAllocateMemory(auhalHostApi->allocations,propSize);
    if ( !name )
        return paInsufficientMemory;
    err = ERR(AudioDeviceGetProperty(macCoreDeviceId, 0, 0, kAudioDevicePropertyDeviceName, &propSize, name));
    if (err)
        return err;
    deviceInfo->name = name;

    /* Try to get the default sample rate.  Don't fail if we can't get this. */
    propSize = sizeof(Float64);
    err = ERR(AudioDeviceGetProperty(macCoreDeviceId, 0, 0, kAudioDevicePropertyNominalSampleRate, &propSize, &sampleRate));
    if (err)
        deviceInfo->defaultSampleRate = 0.0;
    else
        deviceInfo->defaultSampleRate = sampleRate;

    /* Get the maximum number of input and output channels.  Fail if we can't get this. */

    err = GetChannelInfo(auhalHostApi, deviceInfo, macCoreDeviceId, 1);
    if (err)
        return err;

    err = GetChannelInfo(auhalHostApi, deviceInfo, macCoreDeviceId, 0);
    if (err)
        return err;

    return paNoError;
}

PaError PaMacCore_Initialize( PaUtilHostApiRepresentation **hostApi, PaHostApiIndex hostApiIndex )
{
    PaError result = paNoError;
    int i;
    PaMacAUHAL *auhalHostApi;
    PaDeviceInfo *deviceInfoArray;

    VVDBUG(("PaMacCore_Initialize(): hostApiIndex=%d\n", hostApiIndex));

    auhalHostApi = (PaMacAUHAL*)PaUtil_AllocateMemory( sizeof(PaMacAUHAL) );
    if( !auhalHostApi )
    {
        result = paInsufficientMemory;
        goto error;
    }

    auhalHostApi->allocations = PaUtil_CreateAllocationGroup();
    if( !auhalHostApi->allocations )
    {
        result = paInsufficientMemory;
        goto error;
    }

    auhalHostApi->devIds = NULL;
    auhalHostApi->devCount = 0;

    /* get the info we need about the devices */
    result = gatherDeviceInfo( auhalHostApi );
    if( result != paNoError )
       goto error;

    *hostApi = &auhalHostApi->inheritedHostApiRep;
    (*hostApi)->info.structVersion = 1;
    (*hostApi)->info.type = paCoreAudio;
    (*hostApi)->info.name = "Core Audio";

    (*hostApi)->info.defaultInputDevice = paNoDevice;
    (*hostApi)->info.defaultOutputDevice = paNoDevice;

    (*hostApi)->info.deviceCount = 0;  

    if( auhalHostApi->devCount > 0 )
    {
        (*hostApi)->deviceInfos = (PaDeviceInfo**)PaUtil_GroupAllocateMemory(
                auhalHostApi->allocations, sizeof(PaDeviceInfo*) * auhalHostApi->devCount);
        if( !(*hostApi)->deviceInfos )
        {
            result = paInsufficientMemory;
            goto error;
        }

        /* allocate all device info structs in a contiguous block */
        deviceInfoArray = (PaDeviceInfo*)PaUtil_GroupAllocateMemory(
                auhalHostApi->allocations, sizeof(PaDeviceInfo) * auhalHostApi->devCount );
        if( !deviceInfoArray )
        {
            result = paInsufficientMemory;
            goto error;
        }

        for( i=0; i < auhalHostApi->devCount; ++i )
        {
            int err;
            err = InitializeDeviceInfo( auhalHostApi, &deviceInfoArray[i],
                                      auhalHostApi->devIds[i],
                                      hostApiIndex );
            if (err == paNoError)
            { /* copy some info and set the defaults */
                (*hostApi)->deviceInfos[(*hostApi)->info.deviceCount] = &deviceInfoArray[i];
                if (auhalHostApi->devIds[i] == auhalHostApi->defaultIn)
                    (*hostApi)->info.defaultInputDevice = (*hostApi)->info.deviceCount;
                if (auhalHostApi->devIds[i] == auhalHostApi->defaultOut)
                    (*hostApi)->info.defaultOutputDevice = (*hostApi)->info.deviceCount;
                (*hostApi)->info.deviceCount++;
            }
            else
            { /* there was an error. we need to shift the devices down, so we ignore this one */
                int j;
                auhalHostApi->devCount--;
                for( j=i; j<auhalHostApi->devCount; ++j )
                   auhalHostApi->devIds[j] = auhalHostApi->devIds[j+1];
                i--;
            }
        }
    }

    (*hostApi)->Terminate = Terminate;
    (*hostApi)->OpenStream = OpenStream;
    (*hostApi)->IsFormatSupported = IsFormatSupported;

    PaUtil_InitializeStreamInterface( &auhalHostApi->callbackStreamInterface,
                                      CloseStream, StartStream,
                                      StopStream, AbortStream, IsStreamStopped,
                                      IsStreamActive,
                                      GetStreamTime, GetStreamCpuLoad,
                                      PaUtil_DummyRead, PaUtil_DummyWrite,
                                      PaUtil_DummyGetReadAvailable,
                                      PaUtil_DummyGetWriteAvailable );

    PaUtil_InitializeStreamInterface( &auhalHostApi->blockingStreamInterface,
                                      CloseStream, StartStream,
                                      StopStream, AbortStream, IsStreamStopped,
                                      IsStreamActive,
                                      GetStreamTime, PaUtil_DummyGetCpuLoad,
                                      ReadStream, WriteStream,
                                      GetStreamReadAvailable,
                                      GetStreamWriteAvailable );

    return result;

error:
    if( auhalHostApi )
    {
        if( auhalHostApi->allocations )
        {
            PaUtil_FreeAllAllocations( auhalHostApi->allocations );
            PaUtil_DestroyAllocationGroup( auhalHostApi->allocations );
        }
                
        PaUtil_FreeMemory( auhalHostApi );
    }
    return result;
}


static void Terminate( struct PaUtilHostApiRepresentation *hostApi )
{
    PaMacAUHAL *auhalHostApi = (PaMacAUHAL*)hostApi;

    VVDBUG(("Terminate()\n"));

    /*
        IMPLEMENT ME:
            - clean up any resources not handled by the allocation group
        TODO: Double check that everything is handled by alloc group
    */

    if( auhalHostApi->allocations )
    {
        PaUtil_FreeAllAllocations( auhalHostApi->allocations );
        PaUtil_DestroyAllocationGroup( auhalHostApi->allocations );
    }

    PaUtil_FreeMemory( auhalHostApi );
}


static PaError IsFormatSupported( struct PaUtilHostApiRepresentation *hostApi,
                                  const PaStreamParameters *inputParameters,
                                  const PaStreamParameters *outputParameters,
                                  double sampleRate )
{
    int inputChannelCount, outputChannelCount;
    PaSampleFormat inputSampleFormat, outputSampleFormat;