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