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CoreAudio: obtain sample rate information for devices

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This commit is contained in:
Andrew Kelley 2015-08-03 14:29:57 -07:00
parent c52e76928f
commit b0f983bd84
1 changed files with 31 additions and 13 deletions
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44
src/coreaudio.cpp
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@ -97,6 +97,10 @@ static int aim_to_scope(SoundIoDeviceAim aim) {
return (aim == SoundIoDeviceAimInput) ?
kAudioObjectPropertyScopeInput : kAudioObjectPropertyScopeOutput;
}
// TODO subscribe to device property changes for every property we read and
// trigger a rescan if anything changes. test with changing the preferredchannellayout
// for the device
// TODO
/*
*
@ -123,13 +127,6 @@ 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 kAudioDevicePropertyNominalSampleRate
A Float64 that indicates the current nominal sample rate of the AudioDevice.
@constant kAudioDevicePropertyAvailableNominalSampleRates
An array of AudioValueRange structs that indicates the valid ranges for the
nominal sample rate of the AudioDevice.
*/
/*
@constant kAudioDevicePropertyIcon
A CFURLRef that indicates an image file that can be used to represent the
@ -239,6 +236,7 @@ static int from_coreaudio_layout(const AudioChannelLayout *ca_layout, SoundIoCha
case kAudioChannelLayoutTag_Stereo:
case kAudioChannelLayoutTag_StereoHeadphones:
case kAudioChannelLayoutTag_MatrixStereo:
case kAudioChannelLayoutTag_Binaural:
layout->channel_count = 2;
layout->channels[0] = SoundIoChannelIdFrontLeft;
layout->channels[1] = SoundIoChannelIdFrontRight;
@ -248,11 +246,6 @@ static int from_coreaudio_layout(const AudioChannelLayout *ca_layout, SoundIoCha
layout->channels[0] = SoundIoChannelIdXyX;
layout->channels[1] = SoundIoChannelIdXyY;
break;
case kAudioChannelLayoutTag_Binaural:
layout->channel_count = 2;
layout->channels[0] = SoundIoChannelIdFrontLeft;
layout->channels[1] = SoundIoChannelIdFrontRight;
break;
case kAudioChannelLayoutTag_MidSide:
layout->channel_count = 2;
layout->channels[0] = SoundIoChannelIdMsMid;
@ -351,7 +344,6 @@ static void deinit_refresh_devices(RefreshDevices *rd) {
}
// TODO get the device UID which persists between unplug/plug
// TODO go through here and make sure all allocations are freed
static int refresh_devices(struct SoundIoPrivate *si) {
SoundIo *soundio = &si->pub;
SoundIoCoreAudio *sica = &si->backend_data.coreaudio;
@ -536,6 +528,32 @@ static int refresh_devices(struct SoundIoPrivate *si) {
// in CoreAudio, format is always 32-bit native endian float
rd.device->formats[0] = SoundIoFormatFloat32NE;
prop_address.mSelector = kAudioDevicePropertyNominalSampleRate;
prop_address.mScope = aim_to_scope(aim);
prop_address.mElement = kAudioObjectPropertyElementMaster;
io_size = sizeof(double);
if ((os_err = AudioObjectGetPropertyData(deviceID, &prop_address, 0, nullptr,
&io_size, &rd.device->sample_rate_current)))
{
deinit_refresh_devices(&rd);
return SoundIoErrorOpeningDevice;
}
prop_address.mSelector = kAudioDevicePropertyAvailableNominalSampleRates;
prop_address.mScope = aim_to_scope(aim);
prop_address.mElement = kAudioObjectPropertyElementMaster;
io_size = sizeof(AudioValueRange);
AudioValueRange avr;
if ((os_err = AudioObjectGetPropertyData(deviceID, &prop_address, 0, nullptr,
&io_size, &avr)))
{
deinit_refresh_devices(&rd);
return SoundIoErrorOpeningDevice;
}
rd.device->sample_rate_min = avr.mMinimum;
rd.device->sample_rate_max = avr.mMaximum;
SoundIoList<SoundIoDevice *> *device_list;
if (rd.device->aim == SoundIoDeviceAimOutput) {
device_list = &rd.devices_info->output_devices;