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CoreAudio: obtain device buffer duration

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This commit is contained in:
Andrew Kelley 2015-08-03 15:14:41 -07:00
parent d8aa9dce4d
commit c347629c8d
2 changed files with 31 additions and 9 deletions
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4
soundio/soundio.h
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@ -353,8 +353,8 @@ struct SoundIoDevice {
// Period duration in seconds. After this much time passes, write_callback
// is called. If values are unknown, they are set to 0.0. These values are
// meaningless for PulseAudio. For JACK, buffer duration and period duration
// are the same.
// meaningless for PulseAudio and CoreAudio. For JACK, buffer duration and
// period duration are the same.
double period_duration_min;
double period_duration_max;
double period_duration_current;

36
src/coreaudio.cpp
View file

@ -112,13 +112,6 @@ static int aim_to_scope(SoundIoDeviceAim aim) {
clients should re-evaluate everything they need to know about the device,
particularly the layout and values of the controls.
*/
/*
@constant kAudioDevicePropertyBufferFrameSize
A UInt32 whose value indicates the number of frames in the IO buffers.
@constant kAudioDevicePropertyBufferFrameSizeRange
An AudioValueRange indicating the minimum and maximum values, inclusive, for
kAudioDevicePropertyBufferFrameSize.
*/
/*
@constant kAudioDevicePropertyLatency
A UInt32 containing the number of frames of latency in the AudioDevice. Note
@ -577,6 +570,35 @@ static int refresh_devices(struct SoundIoPrivate *si) {
rd.device->sample_rate_min = avr.mMinimum;
rd.device->sample_rate_max = avr.mMaximum;
prop_address.mSelector = kAudioDevicePropertyBufferFrameSize;
prop_address.mScope = aim_to_scope(aim);
prop_address.mElement = kAudioObjectPropertyElementMaster;
io_size = sizeof(UInt32);
UInt32 buffer_frame_size;
if ((os_err = AudioObjectGetPropertyData(deviceID, &prop_address, 0, nullptr,
&io_size, &buffer_frame_size)))
{
deinit_refresh_devices(&rd);
return SoundIoErrorOpeningDevice;
}
double use_sample_rate = clamp(rd.device->sample_rate_min, rd.device->sample_rate_current,
rd.device->sample_rate_max);
rd.device->buffer_duration_current = buffer_frame_size / use_sample_rate;
prop_address.mSelector = kAudioDevicePropertyBufferFrameSizeRange;
prop_address.mScope = aim_to_scope(aim);
prop_address.mElement = kAudioObjectPropertyElementMaster;
io_size = sizeof(AudioValueRange);
if ((os_err = AudioObjectGetPropertyData(deviceID, &prop_address, 0, nullptr,
&io_size, &avr)))
{
deinit_refresh_devices(&rd);
return SoundIoErrorOpeningDevice;
}
rd.device->buffer_duration_min = avr.mMinimum / use_sample_rate;
rd.device->buffer_duration_max = avr.mMaximum / use_sample_rate;
SoundIoList<SoundIoDevice *> *device_list;
if (rd.device->aim == SoundIoDeviceAimOutput) {