251 lines
7 KiB
C++
251 lines
7 KiB
C++
/*************************************************************************/
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/* audio_driver_alsa.cpp */
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/*************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* http://www.godotengine.org */
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/*************************************************************************/
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/* Copyright (c) 2007-2017 Juan Linietsky, Ariel Manzur. */
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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_alsa.h"
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#ifdef ALSA_ENABLED
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#include "globals.h"
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#include <errno.h>
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Error AudioDriverALSA::init() {
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active = false;
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thread_exited = false;
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exit_thread = false;
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pcm_open = false;
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samples_in = NULL;
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samples_out = NULL;
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mix_rate = GLOBAL_DEF("audio/mix_rate", 44100);
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output_format = OUTPUT_STEREO;
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channels = 2;
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int status;
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snd_pcm_hw_params_t *hwparams;
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snd_pcm_sw_params_t *swparams;
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#define CHECK_FAIL(m_cond) \
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if (m_cond) { \
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fprintf(stderr, "ALSA ERR: %s\n", snd_strerror(status)); \
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snd_pcm_close(pcm_handle); \
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ERR_FAIL_COND_V(m_cond, ERR_CANT_OPEN); \
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}
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//todo, add
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//6 chans - "plug:surround51"
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//4 chans - "plug:surround40";
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status = snd_pcm_open(&pcm_handle, "default", SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK);
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ERR_FAIL_COND_V(status < 0, ERR_CANT_OPEN);
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snd_pcm_hw_params_alloca(&hwparams);
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status = snd_pcm_hw_params_any(pcm_handle, hwparams);
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CHECK_FAIL(status < 0);
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status = snd_pcm_hw_params_set_access(pcm_handle, hwparams, SND_PCM_ACCESS_RW_INTERLEAVED);
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CHECK_FAIL(status < 0);
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//not interested in anything else
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status = snd_pcm_hw_params_set_format(pcm_handle, hwparams, SND_PCM_FORMAT_S16_LE);
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CHECK_FAIL(status < 0);
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//todo: support 4 and 6
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status = snd_pcm_hw_params_set_channels(pcm_handle, hwparams, 2);
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CHECK_FAIL(status < 0);
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status = snd_pcm_hw_params_set_rate_near(pcm_handle, hwparams, &mix_rate, NULL);
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CHECK_FAIL(status < 0);
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int latency = GLOBAL_DEF("audio/output_latency", 25);
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buffer_size = nearest_power_of_2(latency * mix_rate / 1000);
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// set buffer size from project settings
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status = snd_pcm_hw_params_set_buffer_size_near(pcm_handle, hwparams, &buffer_size);
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CHECK_FAIL(status < 0);
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// make period size 1/8
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period_size = buffer_size >> 3;
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status = snd_pcm_hw_params_set_period_size_near(pcm_handle, hwparams, &period_size, NULL);
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CHECK_FAIL(status < 0);
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unsigned int periods = 2;
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status = snd_pcm_hw_params_set_periods_near(pcm_handle, hwparams, &periods, NULL);
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CHECK_FAIL(status < 0);
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status = snd_pcm_hw_params(pcm_handle, hwparams);
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CHECK_FAIL(status < 0);
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//snd_pcm_hw_params_free(&hwparams);
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snd_pcm_sw_params_alloca(&swparams);
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status = snd_pcm_sw_params_current(pcm_handle, swparams);
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CHECK_FAIL(status < 0);
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status = snd_pcm_sw_params_set_avail_min(pcm_handle, swparams, period_size);
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CHECK_FAIL(status < 0);
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status = snd_pcm_sw_params_set_start_threshold(pcm_handle, swparams, 1);
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CHECK_FAIL(status < 0);
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status = snd_pcm_sw_params(pcm_handle, swparams);
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CHECK_FAIL(status < 0);
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samples_in = memnew_arr(int32_t, period_size * channels);
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samples_out = memnew_arr(int16_t, period_size * channels);
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snd_pcm_nonblock(pcm_handle, 0);
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mutex = Mutex::create();
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thread = Thread::create(AudioDriverALSA::thread_func, this);
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return OK;
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};
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void AudioDriverALSA::thread_func(void *p_udata) {
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AudioDriverALSA *ad = (AudioDriverALSA *)p_udata;
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while (!ad->exit_thread) {
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if (!ad->active) {
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for (unsigned int i = 0; i < ad->period_size * ad->channels; i++) {
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ad->samples_out[i] = 0;
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};
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} else {
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ad->lock();
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ad->audio_server_process(ad->period_size, ad->samples_in);
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ad->unlock();
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for (unsigned int i = 0; i < ad->period_size * ad->channels; i++) {
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ad->samples_out[i] = ad->samples_in[i] >> 16;
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}
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};
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int todo = ad->period_size;
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int total = 0;
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while (todo) {
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if (ad->exit_thread)
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break;
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uint8_t *src = (uint8_t *)ad->samples_out;
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int wrote = snd_pcm_writei(ad->pcm_handle, (void *)(src + (total * ad->channels)), todo);
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if (wrote < 0) {
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if (ad->exit_thread)
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break;
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if (wrote == -EAGAIN) {
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//can't write yet (though this is blocking..)
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usleep(1000);
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continue;
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}
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wrote = snd_pcm_recover(ad->pcm_handle, wrote, 0);
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if (wrote < 0) {
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//absolute fail
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fprintf(stderr, "ALSA failed and can't recover: %s\n", snd_strerror(wrote));
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ad->active = false;
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ad->exit_thread = true;
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break;
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}
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continue;
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};
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total += wrote;
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todo -= wrote;
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};
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};
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ad->thread_exited = true;
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};
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void AudioDriverALSA::start() {
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active = true;
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};
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int AudioDriverALSA::get_mix_rate() const {
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return mix_rate;
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};
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AudioDriverSW::OutputFormat AudioDriverALSA::get_output_format() const {
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return output_format;
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};
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void AudioDriverALSA::lock() {
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if (!thread || !mutex)
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return;
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mutex->lock();
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};
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void AudioDriverALSA::unlock() {
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if (!thread || !mutex)
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return;
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mutex->unlock();
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};
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void AudioDriverALSA::finish() {
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if (!thread)
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return;
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exit_thread = true;
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Thread::wait_to_finish(thread);
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if (pcm_open)
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snd_pcm_close(pcm_handle);
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if (samples_in) {
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memdelete_arr(samples_in);
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memdelete_arr(samples_out);
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};
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memdelete(thread);
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if (mutex)
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memdelete(mutex);
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thread = NULL;
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};
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AudioDriverALSA::AudioDriverALSA() {
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mutex = NULL;
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thread = NULL;
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pcm_handle = NULL;
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};
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AudioDriverALSA::~AudioDriverALSA(){
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};
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#endif
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