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/*************************************************************************/
/* audio_driver_rtaudio.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* http://www.godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2017 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2017 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. */
/*************************************************************************/
#include "audio_driver_rtaudio.h"
#include "os/os.h"
#include "project_settings.h"
#ifdef RTAUDIO_ENABLED
const char *AudioDriverRtAudio::get_name() const {
#ifdef OSX_ENABLED
return "RtAudio-OSX";
#elif defined(UNIX_ENABLED)
return "RtAudio-ALSA";
#elif defined(WINDOWS_ENABLED)
return "RtAudio-DirectSound";
#else
return "RtAudio-None";
#endif
}
int AudioDriverRtAudio::callback(void *outputBuffer, void *inputBuffer, unsigned int nBufferFrames, double streamTime, RtAudioStreamStatus status, void *userData) {
if (status) {
if (status & RTAUDIO_INPUT_OVERFLOW) {
WARN_PRINT("RtAudio input overflow!");
}
if (status & RTAUDIO_OUTPUT_UNDERFLOW) {
WARN_PRINT("RtAudio output underflow!");
}
}
int32_t *buffer = (int32_t *)outputBuffer;
AudioDriverRtAudio *self = (AudioDriverRtAudio *)userData;
if (self->mutex->try_lock() != OK) {
// what should i do..
for (unsigned int i = 0; i < nBufferFrames; i++)
buffer[i] = 0;
return 0;
}
self->audio_server_process(nBufferFrames, buffer);
self->mutex->unlock();
return 0;
}
Error AudioDriverRtAudio::init() {
active = false;
mutex = Mutex::create(true);
dac = memnew(RtAudio);
ERR_EXPLAIN("Cannot initialize RtAudio audio driver: No devices present.")
ERR_FAIL_COND_V(dac->getDeviceCount() < 1, ERR_UNAVAILABLE);
// FIXME: Adapt to the OutputFormat -> SpeakerMode change
/*
String channels = GLOBAL_DEF("audio/output","stereo");
if (channels=="5.1")
output_format=OUTPUT_5_1;
else if (channels=="quad")
output_format=OUTPUT_QUAD;
else if (channels=="mono")
output_format=OUTPUT_MONO;
else
output_format=OUTPUT_STEREO;
*/
RtAudio::StreamParameters parameters;
parameters.deviceId = dac->getDefaultOutputDevice();
RtAudio::StreamOptions options;
// set the desired numberOfBuffers
unsigned int target_number_of_buffers = 4;
options.numberOfBuffers = target_number_of_buffers;
//options.
//RtAudioStreamFlags flags; /*!< A bit-mask of stream flags (RTAUDIO_NONINTERLEAVED, RTAUDIO_MINIMIZE_LATENCY, RTAUDIO_HOG_DEVICE). *///
//unsigned int numberOfBuffers; /*!< Number of stream buffers. */
//std::string streamName; /*!< A stream name (currently used only in Jack). */
//int priority; /*!< Scheduling priority of callback thread (only used with flag RTAUDIO_SCHEDULE_REALTIME). */
parameters.firstChannel = 0;
mix_rate = GLOBAL_DEF("audio/mix_rate", 44100);
int latency = GLOBAL_DEF("audio/output_latency", 25);
// calculate desired buffer_size, taking the desired numberOfBuffers into account (latency depends on numberOfBuffers*buffer_size)
unsigned int buffer_size = closest_power_of_2(latency * mix_rate / 1000 / target_number_of_buffers);
if (OS::get_singleton()->is_stdout_verbose()) {
print_line("audio buffer size: " + itos(buffer_size));
}
short int tries = 2;
while (true) {
while (true) {
switch (speaker_mode) {
case SPEAKER_MODE_STEREO: parameters.nChannels = 2; break;
case SPEAKER_SURROUND_51: parameters.nChannels = 6; break;
case SPEAKER_SURROUND_71: parameters.nChannels = 8; break;
};
try {
dac->openStream(¶meters, NULL, RTAUDIO_SINT32, mix_rate, &buffer_size, &callback, this, &options);
active = true;
break;
} catch (RtAudioError &e) {
// try with less channels
ERR_PRINT("Unable to open audio, retrying with fewer channels..");
switch (speaker_mode) {
case SPEAKER_MODE_STEREO: speaker_mode = SPEAKER_MODE_STEREO; break;
case SPEAKER_SURROUND_51: speaker_mode = SPEAKER_SURROUND_51; break;
case SPEAKER_SURROUND_71: speaker_mode = SPEAKER_SURROUND_71; break;
};
}
}
// compare actual numberOfBuffers with the desired one. If not equal, close and reopen the stream with adjusted buffer size, so the desired output_latency is still correct
if (target_number_of_buffers != options.numberOfBuffers) {
if (tries <= 0) {
ERR_EXPLAIN("RtAudio: Unable to set correct number of buffers.");
ERR_FAIL_V(ERR_UNAVAILABLE);
break;
}
try {
dac->closeStream();
active = false;
} catch (RtAudioError &e) {
ERR_PRINT(e.what());
ERR_FAIL_V(ERR_UNAVAILABLE);
break;
}
if (OS::get_singleton()->is_stdout_verbose())
print_line("RtAudio: Desired number of buffers (" + itos(target_number_of_buffers) + ") not available. Using " + itos(options.numberOfBuffers) + " instead. Reopening stream with adjusted buffer_size.");
// new buffer size dependent on the ratio between set and actual numberOfBuffers
buffer_size = buffer_size / (options.numberOfBuffers / target_number_of_buffers);
target_number_of_buffers = options.numberOfBuffers;
tries--;
} else {
break;
}
}
return OK;
}
int AudioDriverRtAudio::get_mix_rate() const {
return mix_rate;
}
AudioDriver::SpeakerMode AudioDriverRtAudio::get_speaker_mode() const {
return speaker_mode;
}
void AudioDriverRtAudio::start() {
if (active)
dac->startStream();
}
void AudioDriverRtAudio::lock() {
if (mutex)
mutex->lock();
}
void AudioDriverRtAudio::unlock() {
if (mutex)
mutex->unlock();
}
void AudioDriverRtAudio::finish() {
lock();
if (active && dac->isStreamOpen()) {
dac->closeStream();
active = false;
}
unlock();
if (mutex) {
memdelete(mutex);
mutex = NULL;
}
if (dac) {
memdelete(dac);
dac = NULL;
}
}
AudioDriverRtAudio::AudioDriverRtAudio() {
mutex = NULL;
dac = NULL;
mix_rate = 44100;
speaker_mode = SPEAKER_MODE_STEREO;
}
#endif
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