234 lines
7.5 KiB
C++
234 lines
7.5 KiB
C++
/*************************************************************************/
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/* audio_driver_rtaudio.cpp */
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/*************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* https://godotengine.org */
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/*************************************************************************/
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/* Copyright (c) 2007-2017 Juan Linietsky, Ariel Manzur. */
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/* Copyright (c) 2014-2017 Godot Engine contributors (cf. AUTHORS.md) */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/*************************************************************************/
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#include "audio_driver_rtaudio.h"
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#include "globals.h"
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#include "os/os.h"
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#ifdef RTAUDIO_ENABLED
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const char *AudioDriverRtAudio::get_name() const {
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#ifdef OSX_ENABLED
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return "RtAudio-OSX";
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#elif defined(UNIX_ENABLED)
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return "RtAudio-ALSA";
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#elif defined(WINDOWS_ENABLED)
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return "RtAudio-DirectSound";
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#else
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return "RtAudio-None";
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#endif
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}
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int AudioDriverRtAudio::callback(void *outputBuffer, void *inputBuffer, unsigned int nBufferFrames, double streamTime, RtAudioStreamStatus status, void *userData) {
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if (status) {
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if (status & RTAUDIO_INPUT_OVERFLOW) {
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WARN_PRINT("RtAudio input overflow!");
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}
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if (status & RTAUDIO_OUTPUT_UNDERFLOW) {
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WARN_PRINT("RtAudio output underflow!");
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}
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}
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int32_t *buffer = (int32_t *)outputBuffer;
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AudioDriverRtAudio *self = (AudioDriverRtAudio *)userData;
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if (self->mutex->try_lock() != OK) {
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// what should i do..
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for (unsigned int i = 0; i < nBufferFrames; i++)
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buffer[i] = 0;
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return 0;
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}
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self->audio_server_process(nBufferFrames, buffer);
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self->mutex->unlock();
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return 0;
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}
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Error AudioDriverRtAudio::init() {
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active = false;
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mutex = NULL;
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dac = memnew(RtAudio);
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ERR_EXPLAIN("Cannot initialize RtAudio audio driver: No devices present.")
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ERR_FAIL_COND_V(dac->getDeviceCount() < 1, ERR_UNAVAILABLE);
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String channels = GLOBAL_DEF("audio/output", "stereo");
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if (channels == "5.1")
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output_format = OUTPUT_5_1;
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else if (channels == "quad")
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output_format = OUTPUT_QUAD;
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else if (channels == "mono")
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output_format = OUTPUT_MONO;
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else
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output_format = OUTPUT_STEREO;
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RtAudio::StreamParameters parameters;
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parameters.deviceId = dac->getDefaultOutputDevice();
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RtAudio::StreamOptions options;
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// set the desired numberOfBuffers
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unsigned int target_number_of_buffers = 4;
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options.numberOfBuffers = target_number_of_buffers;
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// options.
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// RtAudioStreamFlags flags; /*!< A bit-mask of stream flags (RTAUDIO_NONINTERLEAVED, RTAUDIO_MINIMIZE_LATENCY, RTAUDIO_HOG_DEVICE). *///
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// unsigned int numberOfBuffers; /*!< Number of stream buffers. */
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// std::string streamName; /*!< A stream name (currently used only in Jack). */
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// int priority; /*!< Scheduling priority of callback thread (only used with flag RTAUDIO_SCHEDULE_REALTIME). */
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parameters.firstChannel = 0;
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mix_rate = GLOBAL_DEF("audio/mix_rate", 44100);
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int latency = GLOBAL_DEF("audio/output_latency", 25);
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// calculate desired buffer_size, taking the desired numberOfBuffers into account (latency depends on numberOfBuffers*buffer_size)
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unsigned int buffer_size = next_power_of_2(latency * mix_rate / 1000 / target_number_of_buffers);
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if (OS::get_singleton()->is_stdout_verbose()) {
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print_line("audio buffer size: " + itos(buffer_size));
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}
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short int tries = 2;
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while (true) {
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while (true) {
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switch (output_format) {
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case OUTPUT_MONO: parameters.nChannels = 1; break;
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case OUTPUT_STEREO: parameters.nChannels = 2; break;
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case OUTPUT_QUAD: parameters.nChannels = 4; break;
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case OUTPUT_5_1: parameters.nChannels = 6; break;
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};
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try {
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dac->openStream(¶meters, NULL, RTAUDIO_SINT32, mix_rate, &buffer_size, &callback, this, &options);
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mutex = Mutex::create(true);
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active = true;
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break;
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} catch (RtAudioError &e) {
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// try with less channels
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ERR_PRINT("Unable to open audio, retrying with fewer channels..");
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switch (output_format) {
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case OUTPUT_MONO:
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ERR_EXPLAIN("Unable to open audio.");
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ERR_FAIL_V(ERR_UNAVAILABLE);
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break;
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case OUTPUT_STEREO: output_format = OUTPUT_MONO; break;
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case OUTPUT_QUAD: output_format = OUTPUT_STEREO; break;
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case OUTPUT_5_1: output_format = OUTPUT_QUAD; break;
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};
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}
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}
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// 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
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if (target_number_of_buffers != options.numberOfBuffers) {
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if (tries <= 0) {
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ERR_EXPLAIN("RtAudio: Unable to set correct number of buffers.");
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ERR_FAIL_V(ERR_UNAVAILABLE);
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break;
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}
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try {
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dac->closeStream();
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} catch (RtAudioError &e) {
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ERR_PRINT(e.what());
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ERR_FAIL_V(ERR_UNAVAILABLE);
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break;
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}
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if (OS::get_singleton()->is_stdout_verbose())
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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.");
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// new buffer size dependent on the ratio between set and actual numberOfBuffers
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buffer_size = buffer_size / (options.numberOfBuffers / target_number_of_buffers);
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target_number_of_buffers = options.numberOfBuffers;
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tries--;
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} else {
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break;
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}
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}
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return OK;
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}
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int AudioDriverRtAudio::get_mix_rate() const {
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return mix_rate;
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}
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AudioDriverSW::OutputFormat AudioDriverRtAudio::get_output_format() const {
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return output_format;
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}
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void AudioDriverRtAudio::start() {
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if (active)
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dac->startStream();
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}
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void AudioDriverRtAudio::lock() {
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if (mutex)
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mutex->lock();
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}
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void AudioDriverRtAudio::unlock() {
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if (mutex)
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mutex->unlock();
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}
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void AudioDriverRtAudio::finish() {
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if (active && dac->isStreamOpen())
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dac->closeStream();
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if (mutex)
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memdelete(mutex);
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if (dac)
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memdelete(dac);
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}
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AudioDriverRtAudio::AudioDriverRtAudio() {
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active = false;
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mutex = NULL;
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mix_rate = 44100;
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output_format = OUTPUT_STEREO;
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}
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#endif
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