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godot/platform/osx/audio_driver_osx.cpp

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/*************************************************************************/
/* audio_driver_osx.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2018 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2018 Godot Engine contributors (cf. AUTHORS.md) */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/*************************************************************************/
#ifdef OSX_ENABLED
#include "audio_driver_osx.h"
#include "globals.h"
#include "os/os.h"
#define kOutputBus 0
static OSStatus outputDeviceAddressCB(AudioObjectID inObjectID, UInt32 inNumberAddresses, const AudioObjectPropertyAddress *inAddresses, void *__nullable inClientData) {
AudioDriverOSX *driver = (AudioDriverOSX *)inClientData;
driver->reopen();
return noErr;
}
Error AudioDriverOSX::initDevice() {
AudioComponentDescription desc;
zeromem(&desc, sizeof(desc));
desc.componentType = kAudioUnitType_Output;
desc.componentSubType = kAudioUnitSubType_HALOutput;
desc.componentManufacturer = kAudioUnitManufacturer_Apple;
AudioComponent comp = AudioComponentFindNext(NULL, &desc);
ERR_FAIL_COND_V(comp == NULL, FAILED);
OSStatus result = AudioComponentInstanceNew(comp, &audio_unit);
ERR_FAIL_COND_V(result != noErr, FAILED);
AudioStreamBasicDescription strdesc;
// TODO: Implement this
/*zeromem(&strdesc, sizeof(strdesc));
UInt32 size = sizeof(strdesc);
result = AudioUnitGetProperty(audio_unit, kAudioUnitProperty_StreamFormat, kAudioUnitScope_Output, kOutputBus, &strdesc, &size);
ERR_FAIL_COND_V(result != noErr, FAILED);
switch (strdesc.mChannelsPerFrame) {
case 2: // Stereo
case 6: // Surround 5.1
case 8: // Surround 7.1
channels = strdesc.mChannelsPerFrame;
break;
default:
// Unknown number of channels, default to stereo
channels = 2;
break;
}*/
mix_rate = GLOBAL_DEF("audio/mix_rate", 44100);
zeromem(&strdesc, sizeof(strdesc));
strdesc.mFormatID = kAudioFormatLinearPCM;
strdesc.mFormatFlags = kLinearPCMFormatFlagIsSignedInteger | kLinearPCMFormatFlagIsPacked;
strdesc.mChannelsPerFrame = channels;
strdesc.mSampleRate = mix_rate;
strdesc.mFramesPerPacket = 1;
strdesc.mBitsPerChannel = 16;
strdesc.mBytesPerFrame = strdesc.mBitsPerChannel * strdesc.mChannelsPerFrame / 8;
strdesc.mBytesPerPacket = strdesc.mBytesPerFrame * strdesc.mFramesPerPacket;
result = AudioUnitSetProperty(audio_unit, kAudioUnitProperty_StreamFormat, kAudioUnitScope_Input, kOutputBus, &strdesc, sizeof(strdesc));
ERR_FAIL_COND_V(result != noErr, FAILED);
int latency = GLOBAL_DEF("audio/output_latency", 25);
unsigned int buffer_size = closest_power_of_2(latency * mix_rate / 1000);
if (OS::get_singleton()->is_stdout_verbose()) {
print_line("audio buffer size: " + itos(buffer_size) + " calculated latency: " + itos(buffer_size * 1000 / mix_rate));
}
samples_in.resize(buffer_size);
buffer_frames = buffer_size / channels;
AURenderCallbackStruct callback;
zeromem(&callback, sizeof(AURenderCallbackStruct));
callback.inputProc = &AudioDriverOSX::output_callback;
callback.inputProcRefCon = this;
result = AudioUnitSetProperty(audio_unit, kAudioUnitProperty_SetRenderCallback, kAudioUnitScope_Input, kOutputBus, &callback, sizeof(callback));
ERR_FAIL_COND_V(result != noErr, FAILED);
result = AudioUnitInitialize(audio_unit);
ERR_FAIL_COND_V(result != noErr, FAILED);
return OK;
}
Error AudioDriverOSX::finishDevice() {
OSStatus result;
if (active) {
result = AudioOutputUnitStop(audio_unit);
ERR_FAIL_COND_V(result != noErr, FAILED);
active = false;
}
result = AudioUnitUninitialize(audio_unit);
ERR_FAIL_COND_V(result != noErr, FAILED);
return OK;
}
Error AudioDriverOSX::init() {
OSStatus result;
mutex = Mutex::create();
active = false;
channels = 2;
outputDeviceAddress.mSelector = kAudioHardwarePropertyDefaultOutputDevice;
outputDeviceAddress.mScope = kAudioObjectPropertyScopeGlobal;
outputDeviceAddress.mElement = kAudioObjectPropertyElementMaster;
result = AudioObjectAddPropertyListener(kAudioObjectSystemObject, &outputDeviceAddress, &outputDeviceAddressCB, this);
ERR_FAIL_COND_V(result != noErr, FAILED);
return initDevice();
};
Error AudioDriverOSX::reopen() {
bool restart = false;
lock();
if (active) {
restart = true;
}
Error err = finishDevice();
if (err != OK) {
ERR_PRINT("finishDevice failed");
unlock();
return err;
}
err = initDevice();
if (err != OK) {
ERR_PRINT("initDevice failed");
unlock();
return err;
}
if (restart) {
start();
}
unlock();
return OK;
}
OSStatus AudioDriverOSX::output_callback(void *inRefCon,
AudioUnitRenderActionFlags *ioActionFlags,
const AudioTimeStamp *inTimeStamp,
UInt32 inBusNumber, UInt32 inNumberFrames,
AudioBufferList *ioData) {
AudioDriverOSX *ad = (AudioDriverOSX *)inRefCon;
if (!ad->active || !ad->try_lock()) {
for (unsigned int i = 0; i < ioData->mNumberBuffers; i++) {
AudioBuffer *abuf = &ioData->mBuffers[i];
zeromem(abuf->mData, abuf->mDataByteSize);
};
return 0;
};
for (unsigned int i = 0; i < ioData->mNumberBuffers; i++) {
AudioBuffer *abuf = &ioData->mBuffers[i];
int frames_left = inNumberFrames;
int16_t *out = (int16_t *)abuf->mData;
while (frames_left) {
int frames = MIN(frames_left, ad->buffer_frames);
ad->audio_server_process(frames, ad->samples_in.ptr());
for (int j = 0; j < frames * ad->channels; j++) {
out[j] = ad->samples_in[j] >> 16;
}
frames_left -= frames;
out += frames * ad->channels;
};
};
ad->unlock();
return 0;
};
void AudioDriverOSX::start() {
if (!active) {
OSStatus result = AudioOutputUnitStart(audio_unit);
if (result != noErr) {
ERR_PRINT("AudioOutputUnitStart failed");
} else {
active = true;
}
}
};
int AudioDriverOSX::get_mix_rate() const {
return 44100;
};
AudioDriverSW::OutputFormat AudioDriverOSX::get_output_format() const {
return OUTPUT_STEREO;
};
void AudioDriverOSX::lock() {
if (mutex)
mutex->lock();
};
void AudioDriverOSX::unlock() {
if (mutex)
mutex->unlock();
};
bool AudioDriverOSX::try_lock() {
if (mutex)
return mutex->try_lock() == OK;
return true;
}
void AudioDriverOSX::finish() {
finishDevice();
OSStatus result = AudioObjectRemovePropertyListener(kAudioObjectSystemObject, &outputDeviceAddress, &outputDeviceAddressCB, this);
if (result != noErr) {
ERR_PRINT("AudioObjectRemovePropertyListener failed");
}
AURenderCallbackStruct callback;
zeromem(&callback, sizeof(AURenderCallbackStruct));
result = AudioUnitSetProperty(audio_unit, kAudioUnitProperty_SetRenderCallback, kAudioUnitScope_Input, kOutputBus, &callback, sizeof(callback));
if (result != noErr) {
ERR_PRINT("AudioUnitSetProperty failed");
}
if (mutex) {
memdelete(mutex);
mutex = NULL;
}
};
AudioDriverOSX::AudioDriverOSX() {
active = false;
mutex = NULL;
mix_rate = 44100;
channels = 2;
samples_in.clear();
};
AudioDriverOSX::~AudioDriverOSX(){};
#endif
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