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/*************************************************/
/* audio_driver_rtaudio.cpp */
/*************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/*************************************************/
/* Source code within this file is: */
/* (c) 2007-2016 Juan Linietsky, Ariel Manzur */
/* All Rights Reserved. */
/*************************************************/
#include "audio_driver_rtaudio.h"
#include "globals.h"
#include "os/os.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
}
// Two-channel sawtooth wave generator.
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=NULL;
dac = memnew( RtAudio );
ERR_EXPLAIN("Cannot initialize RtAudio audio driver: No devices present.")
ERR_FAIL_COND_V( dac->getDeviceCount() < 1, ERR_UNAVAILABLE );
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;
// 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);
unsigned int buffer_size = nearest_power_of_2( latency * mix_rate / 1000 );
if (OS::get_singleton()->is_stdout_verbose()) {
print_line("audio buffer size: "+itos(buffer_size));
}
// bool success=false;
while( true) {
switch(output_format) {
case OUTPUT_MONO: parameters.nChannels = 1; break;
case OUTPUT_STEREO: parameters.nChannels = 2; break;
case OUTPUT_QUAD: parameters.nChannels = 4; break;
case OUTPUT_5_1: parameters.nChannels = 6; break;
};
try {
dac->openStream( ¶meters, NULL, RTAUDIO_SINT32,
mix_rate, &buffer_size, &callback, this,&options );
mutex = Mutex::create(true);
active=true;
break;
} catch ( RtAudioError& e ) {
// try with less channels
ERR_PRINT("Unable to open audio, retrying with fewer channels..");
switch(output_format) {
case OUTPUT_MONO: ERR_EXPLAIN("Unable to open audio."); ERR_FAIL_V( ERR_UNAVAILABLE ); break;
case OUTPUT_STEREO: output_format=OUTPUT_MONO; break;
case OUTPUT_QUAD: output_format=OUTPUT_STEREO; break;
case OUTPUT_5_1: output_format=OUTPUT_QUAD; break;
};
}
}
return OK;
}
int AudioDriverRtAudio::get_mix_rate() const {
return mix_rate;
}
AudioDriverSW::OutputFormat AudioDriverRtAudio::get_output_format() const {
return output_format;
}
void AudioDriverRtAudio::start() {
if (active)
dac->startStream();
}
void AudioDriverRtAudio::lock() {
if (mutex)
mutex->lock();
}
void AudioDriverRtAudio::unlock() {
if (mutex)
mutex->unlock();
}
void AudioDriverRtAudio::finish() {
if ( active && dac->isStreamOpen() )
dac->closeStream();
if (mutex)
memdelete(mutex);
if (dac)
memdelete(dac);
}
AudioDriverRtAudio::AudioDriverRtAudio()
{
mutex=NULL;
mix_rate=44100;
output_format=OUTPUT_STEREO;
}
#endif
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