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added function to query core audio buffer size range

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This commit is contained in:
rossb 2012-01-11 13:03:11 +00:00
commit 4b2f4dcd37
2 changed files with 46 additions and 1 deletions
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13
include/pa_mac_core.h
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@ -124,6 +124,19 @@ AudioDeviceID PaMacCore_GetStreamOutputDevice( PaStream* s );
*/
const char *PaMacCore_GetChannelName( int device, int channelIndex, bool input );
/** Retrieve the range of legal native buffer sizes for the specificed device, in sample frames.
@param device The global index of the PortAudio device about which the query is being made.
@param minBufferSizeFrames A pointer to the location which will receive the minimum buffer size value.
@param maxBufferSizeFrames A pointer to the location which will receive the maximum buffer size value.
@see kAudioDevicePropertyBufferFrameSizeRange in the CoreAudio SDK.
*/
PaError PaMacCore_GetBufferSizeRange( PaDeviceIndex device,
long *minBufferSizeFrames, long *maxBufferSizeFrames );
/**
* Flags
*/

32
src/hostapi/coreaudio/pa_mac_core.c
View file

@ -205,7 +205,39 @@ const char *PaMacCore_GetChannelName( int device, int channelIndex, bool input )
}
PaError PaMacCore_GetBufferSizeRange( PaDeviceIndex device,
long *minBufferSizeFrames, long *maxBufferSizeFrames )
{
PaError result;
PaUtilHostApiRepresentation *hostApi;
result = PaUtil_GetHostApiRepresentation( &hostApi, paCoreAudio );
if( result == paNoError )
{
PaDeviceIndex hostApiDeviceIndex;
result = PaUtil_DeviceIndexToHostApiDeviceIndex( &hostApiDeviceIndex, device, hostApi );
if( result == paNoError )
{
PaMacAUHAL *macCoreHostApi = (PaMacAUHAL*)hostApi;
AudioDeviceID macCoreDeviceId = macCoreHostApi->devIds[hostApiDeviceIndex];
AudioValueRange audioRange;
UInt32 propSize = sizeof( audioRange );
// return the size range for the output scope unless we only have inputs
Boolean isInput = 0;
if( macCoreHostApi->inheritedHostApiRep.deviceInfos[hostApiDeviceIndex]->maxOutputChannels == 0 )
isInput = 1;
result = WARNING(AudioDeviceGetProperty( macCoreDeviceId, 0, isInput, kAudioDevicePropertyBufferFrameSizeRange, &propSize, &audioRange ) );
*minBufferSizeFrames = audioRange.mMinimum;
*maxBufferSizeFrames = audioRange.mMaximum;
}
}
return result;
}
AudioDeviceID PaMacCore_GetStreamInputDevice( PaStream* s )