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Added support for single channel inputs for CoreAudio

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This commit is contained in:
Marcelo Fernandez 2018-07-27 13:54:30 -03:00
parent 09eafaba62
commit e5e4dbb6c9
2 changed files with 48 additions and 9 deletions
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55
drivers/coreaudio/audio_driver_coreaudio.cpp
View file

@ -122,6 +122,26 @@ Error AudioDriverCoreAudio::init() {
break;
}
zeromem(&strdesc, sizeof(strdesc));
size = sizeof(strdesc);
result = AudioUnitGetProperty(audio_unit, kAudioUnitProperty_StreamFormat, kAudioUnitScope_Output, kInputBus, &strdesc, &size);
ERR_FAIL_COND_V(result != noErr, FAILED);
switch (strdesc.mChannelsPerFrame) {
case 1: // Mono
capture_channels = 1;
break;
case 2: // Stereo
capture_channels = 2;
break;
default:
// Unknown number of channels, default to stereo
capture_channels = 2;
break;
}
mix_rate = GLOBAL_DEF_RST("audio/mix_rate", DEFAULT_MIX_RATE);
zeromem(&strdesc, sizeof(strdesc));
@ -137,7 +157,7 @@ Error AudioDriverCoreAudio::init() {
result = AudioUnitSetProperty(audio_unit, kAudioUnitProperty_StreamFormat, kAudioUnitScope_Input, kOutputBus, &strdesc, sizeof(strdesc));
ERR_FAIL_COND_V(result != noErr, FAILED);
strdesc.mChannelsPerFrame = 2;
strdesc.mChannelsPerFrame = capture_channels;
result = AudioUnitSetProperty(audio_unit, kAudioUnitProperty_StreamFormat, kAudioUnitScope_Output, kInputBus, &strdesc, sizeof(strdesc));
ERR_FAIL_COND_V(result != noErr, FAILED);
@ -155,10 +175,8 @@ Error AudioDriverCoreAudio::init() {
samples_in.resize(buffer_size);
input_buf.resize(buffer_size);
audio_input_buffer.resize(buffer_size * 8);
for (int i = 0; i < audio_input_buffer.size(); i++) {
audio_input_buffer.write[i] = 0;
}
audio_input_position = 0;
audio_input_size = 0;
if (OS::get_singleton()->is_stdout_verbose()) {
print_line("CoreAudio: detected " + itos(channels) + " channels");
@ -229,6 +247,17 @@ OSStatus AudioDriverCoreAudio::output_callback(void *inRefCon,
return 0;
};
void AudioDriverCoreAudio::_input_write_sample(int32_t sample) {
audio_input_buffer.write[audio_input_position++] = sample;
if (audio_input_position >= audio_input_buffer.size()) {
audio_input_position = 0;
}
if (audio_input_size < audio_input_buffer.size()) {
audio_input_size++;
}
}
OSStatus AudioDriverCoreAudio::input_callback(void *inRefCon,
AudioUnitRenderActionFlags *ioActionFlags,
const AudioTimeStamp *inTimeStamp,
@ -245,15 +274,18 @@ OSStatus AudioDriverCoreAudio::input_callback(void *inRefCon,
AudioBufferList bufferList;
bufferList.mNumberBuffers = 1;
bufferList.mBuffers[0].mData = ad->input_buf.ptrw();
bufferList.mBuffers[0].mNumberChannels = 2;
bufferList.mBuffers[0].mNumberChannels = ad->capture_channels;
bufferList.mBuffers[0].mDataByteSize = ad->input_buf.size() * sizeof(int16_t);
OSStatus result = AudioUnitRender(ad->audio_unit, ioActionFlags, inTimeStamp, inBusNumber, inNumberFrames, &bufferList);
if (result == noErr) {
for (int i = 0; i < inNumberFrames * 2; i++) {
ad->audio_input_buffer.write[ad->audio_input_position++] = ad->input_buf[i] << 16;
if (ad->audio_input_position >= ad->audio_input_buffer.size()) {
ad->audio_input_position = 0;
for (int i = 0; i < inNumberFrames * ad->capture_channels; i++) {
int32_t sample = ad->input_buf[i] << 16;
ad->_input_write_sample(sample);
if (ad->capture_channels == 1) {
// In case input device is single channel convert it to Stereo
ad->_input_write_sample(sample);
}
}
} else {
@ -511,6 +543,10 @@ void AudioDriverCoreAudio::_set_device(const String &device, bool capture) {
if (found) {
OSStatus result = AudioUnitSetProperty(audio_unit, kAudioOutputUnitProperty_CurrentDevice, kAudioUnitScope_Global, capture ? kInputBus : kOutputBus, &deviceId, sizeof(AudioDeviceID));
ERR_FAIL_COND(result != noErr);
// Reset audio input to keep synchronisation.
audio_input_position = 0;
audio_input_size = 0;
}
}
@ -558,6 +594,7 @@ AudioDriverCoreAudio::AudioDriverCoreAudio() {
mix_rate = 0;
channels = 2;
capture_channels = 2;
buffer_frames = 0;

2
drivers/coreaudio/audio_driver_coreaudio.h
View file

@ -52,6 +52,7 @@ class AudioDriverCoreAudio : public AudioDriver {
int mix_rate;
unsigned int channels;
unsigned int capture_channels;
unsigned int buffer_frames;
Vector<int32_t> samples_in;
@ -60,6 +61,7 @@ class AudioDriverCoreAudio : public AudioDriver {
#ifdef OSX_ENABLED
Array _get_device_list(bool capture = false);
void _set_device(const String &device, bool capture = false);
void _input_write_sample(int32_t sample);
static OSStatus input_device_address_cb(AudioObjectID inObjectID,
UInt32 inNumberAddresses, const AudioObjectPropertyAddress *inAddresses,