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coreaudio: capture devices should let the system allocate the render buffer.

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This commit is contained in:
Ryan C. Gordon 2016-09-03 00:13:41 -04:00
parent fda7a3d158
commit 3b53304a94
2 changed files with 12 additions and 26 deletions
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37
src/audio/coreaudio/SDL_coreaudio.c
View file

@ -354,16 +354,19 @@ inputCallback(void *inRefCon,
UInt32 inBusNumber, UInt32 inNumberFrames,
AudioBufferList *ioData)
{
AudioBufferList bufferList;
SDL_AudioDevice *this = (SDL_AudioDevice *) inRefCon;
if (!SDL_AtomicGet(&this->enabled) || SDL_AtomicGet(&this->paused)) {
return noErr; /* just drop this if we're not accepting input. */
}
const OSStatus err = AudioUnitRender(this->hidden->audioUnit, ioActionFlags, inTimeStamp, inBusNumber, inNumberFrames, &this->hidden->captureBufferList);
SDL_assert(this->hidden->captureBufferList.mNumberBuffers == 1);
bufferList.mNumberBuffers = 1;
bufferList.mBuffers[0].mData = NULL;
const OSStatus err = AudioUnitRender(this->hidden->audioUnit, ioActionFlags, inTimeStamp, inBusNumber, inNumberFrames, &bufferList);
if (err == noErr) {
const AudioBuffer *abuf = &this->hidden->captureBufferList.mBuffers[0];
const AudioBuffer *abuf = &bufferList.mBuffers[0];
UInt32 remaining = abuf->mDataByteSize;
const Uint8 *ptr = (const Uint8 *) abuf->mData;
@ -460,7 +463,6 @@ COREAUDIO_CloseDevice(_THIS)
AudioComponentInstanceDispose(this->hidden->audioUnit);
}
SDL_free(this->hidden->captureBufferList.mBuffers[0].mData);
SDL_free(this->hidden->buffer);
SDL_free(this->hidden);
@ -604,27 +606,12 @@ prepare_audiounit(_THIS, void *handle, int iscapture,
CHECK_RESULT("AudioUnitSetProperty (kAudioUnitProperty_StreamFormat)");
if (iscapture) { /* only need to do this for capture devices. */
void *ptr;
UInt32 framesize = 0;
UInt32 propsize = sizeof (UInt32);
result = AudioUnitGetProperty(this->hidden->audioUnit,
kAudioUnitProperty_MaximumFramesPerSlice,
kAudioUnitScope_Global, output_bus,
&framesize, &propsize);
CHECK_RESULT
("AudioUnitGetProperty (kAudioDevicePropertyBufferFrameSize)");
framesize *= SDL_AUDIO_BITSIZE(this->spec.format) / 8;
ptr = SDL_calloc(1, framesize);
if (ptr == NULL) {
SDL_OutOfMemory();
return 0;
}
this->hidden->captureBufferList.mNumberBuffers = 1;
this->hidden->captureBufferList.mBuffers[0].mNumberChannels = this->spec.channels;
this->hidden->captureBufferList.mBuffers[0].mDataByteSize = framesize;
this->hidden->captureBufferList.mBuffers[0].mData = ptr;
const UInt32 yes = 1;
result = AudioUnitSetProperty(this->hidden->audioUnit,
kAudioUnitProperty_ShouldAllocateBuffer,
kAudioUnitScope_Output,
input_bus, &yes, sizeof (yes));
CHECK_RESULT("AudioUnitSetProperty (kAudioUnitProperty_ShouldAllocateBuffer)");
}
/* Set the audio callback */

1
src/audio/coreaudio/SDL_coreaudio.h
View file

@ -48,7 +48,6 @@ struct SDL_PrivateAudioData
void *buffer;
UInt32 bufferOffset;
UInt32 bufferSize;
AudioBufferList captureBufferList;
#if MACOSX_COREAUDIO
AudioDeviceID deviceID;
#endif