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CoreAudio: ability to set buffer duration

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This commit is contained in:
Andrew Kelley 2015-08-07 13:40:25 -07:00
parent cdb02e2b46
commit 48d927d8e3
1 changed files with 21 additions and 18 deletions
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39
src/coreaudio.cpp
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@ -195,19 +195,6 @@ static int aim_to_scope(SoundIoDeviceAim aim) {
If both the device and the stream say they have latency, then the total
latency for the stream is the device latency summed with the stream latency.
*/
/*
@constant kAudioDevicePropertyIcon
A CFURLRef that indicates an image file that can be used to represent the
device visually. The caller is responsible for releasing the returned
CFObject.
*/
/*
@constant kAudioDevicePropertyPreferredChannelsForStereo
An array of two UInt32s, the first for the left channel, the second for the
right channel, that indicate the channel numbers to use for stereo IO on the
device. The value of this property can be different for input and output and
there are no restrictions on the channel numbers that can be used.
*/
static SoundIoChannelId from_channel_descr(const AudioChannelDescription *descr) {
switch (descr->mChannelLabel) {
@ -597,7 +584,7 @@ static int refresh_devices(struct SoundIoPrivate *si) {
rd.device = &dev->pub;
rd.device->ref_count = 1;
rd.device->soundio = soundio;
rd.device->is_raw = false; // TODO
rd.device->is_raw = false;
rd.device->aim = aim;
rd.device->id = soundio_str_dupe(rd.device_uid, rd.device_uid_len);
rd.device->name = soundio_str_dupe(rd.device_name, rd.device_name_len);
@ -886,13 +873,20 @@ static OSStatus write_callback_ca(void *userdata, AudioUnitRenderActionFlags *io
}
static int outstream_open_ca(struct SoundIoPrivate *si, struct SoundIoOutStreamPrivate *os) {
// TODO: use outstream->buffer_duration
SoundIoOutStreamCoreAudio *osca = &os->backend_data.coreaudio;
SoundIoOutStream *outstream = &os->pub;
SoundIoDevice *device = outstream->device;
SoundIoDevicePrivate *dev = (SoundIoDevicePrivate *)device;
SoundIoDeviceCoreAudio *dca = &dev->backend_data.coreaudio;
if (outstream->buffer_duration == 0.0)
outstream->buffer_duration = device->buffer_duration_current;
outstream->buffer_duration = clamp(
device->buffer_duration_min,
outstream->buffer_duration,
device->buffer_duration_max);
AudioComponentDescription desc;
desc.componentType = kAudioUnitType_Output;
desc.componentSubType = kAudioUnitSubType_HALOutput;
@ -949,12 +943,21 @@ static int outstream_open_ca(struct SoundIoPrivate *si, struct SoundIoOutStreamP
return SoundIoErrorOpeningDevice;
}
AudioObjectPropertyAddress prop_address = {
kAudioDeviceProcessorOverload,
kAudioObjectPropertyScopeGlobal,
kAudioDevicePropertyBufferFrameSize,
kAudioObjectPropertyScopeInput,
kAudioObjectPropertyElementMaster
};
UInt32 buffer_frame_size = outstream->buffer_duration * outstream->sample_rate;
if ((os_err = AudioObjectSetPropertyData(dca->device_id, &prop_address,
0, nullptr, sizeof(UInt32), &buffer_frame_size)))
{
outstream_destroy_ca(si, os);
return SoundIoErrorOpeningDevice;
}
prop_address.mSelector = kAudioDeviceProcessorOverload;
prop_address.mScope = kAudioObjectPropertyScopeGlobal;
if ((os_err = AudioObjectAddPropertyListener(dca->device_id, &prop_address,
on_device_overload, os)))
{