mirror of
https://github.com/blendogames/quadrilateralcowboy.git
synced 2024-11-24 21:11:49 +00:00
316 lines
11 KiB
C++
316 lines
11 KiB
C++
/*
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===========================================================================
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Doom 3 GPL Source Code
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Copyright (C) 1999-2011 id Software LLC, a ZeniMax Media company.
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This file is part of the Doom 3 GPL Source Code (?Doom 3 Source Code?).
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Doom 3 Source Code is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Doom 3 Source Code is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Doom 3 Source Code. If not, see <http://www.gnu.org/licenses/>.
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In addition, the Doom 3 Source Code is also subject to certain additional terms. You should have received a copy of these additional terms immediately following the terms and conditions of the GNU General Public License which accompanied the Doom 3 Source Code. If not, please request a copy in writing from id Software at the address below.
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If you have questions concerning this license or the applicable additional terms, you may contact in writing id Software LLC, c/o ZeniMax Media Inc., Suite 120, Rockville, Maryland 20850 USA.
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===========================================================================
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*/
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#include "../../idlib/precompiled.h"
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#include "../../sound/snd_local.h"
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#include "../posix/posix_public.h"
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#include "sound.h"
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#include <dlfcn.h>
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static idCVar s_alsa_pcm( "s_alsa_pcm", "default", CVAR_SYSTEM | CVAR_ARCHIVE, "which alsa pcm device to use. default, hwplug, hw.. see alsa docs" );
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static idCVar s_alsa_lib( "s_alsa_lib", "libasound.so.2", CVAR_SYSTEM | CVAR_ARCHIVE, "alsa client sound library" );
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/*
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===============
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idAudioHardwareALSA::DLOpen
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===============
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*/
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bool idAudioHardwareALSA::DLOpen( void ) {
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const char *version;
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if ( m_handle ) {
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return true;
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}
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common->Printf( "dlopen(%s)\n", s_alsa_lib.GetString() );
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if ( !( m_handle = dlopen( s_alsa_lib.GetString(), RTLD_NOW | RTLD_GLOBAL ) ) ) {
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common->Printf( "dlopen(%s) failed: %s\n", s_alsa_lib.GetString(), dlerror() );
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return false;
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}
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// print the version if available
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id_snd_asoundlib_version = ( pfn_snd_asoundlib_version )dlsym( m_handle, "snd_asoundlib_version" );
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if ( !id_snd_asoundlib_version ) {
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common->Printf( "dlsym(\"snd_asoundlib_version\") failed: %s\n", dlerror() );
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common->Warning( "please consider upgrading alsa to a more recent version." );
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} else {
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version = id_snd_asoundlib_version();
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common->Printf( "asoundlib version: %s\n", version );
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}
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// dlsym the symbols
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ALSA_DLSYM(snd_pcm_avail_update);
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ALSA_DLSYM(snd_pcm_close);
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ALSA_DLSYM(snd_pcm_hw_params);
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ALSA_DLSYM(snd_pcm_hw_params_any);
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ALSA_DLSYM(snd_pcm_hw_params_get_buffer_size);
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ALSA_DLSYM(snd_pcm_hw_params_set_access);
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ALSA_DLSYM(snd_pcm_hw_params_set_buffer_size_min);
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ALSA_DLSYM(snd_pcm_hw_params_set_channels);
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ALSA_DLSYM(snd_pcm_hw_params_set_format);
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ALSA_DLSYM(snd_pcm_hw_params_set_rate);
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ALSA_DLSYM(snd_pcm_hw_params_sizeof);
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ALSA_DLSYM(snd_pcm_open);
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ALSA_DLSYM(snd_pcm_prepare);
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ALSA_DLSYM(snd_pcm_state);
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ALSA_DLSYM(snd_pcm_writei);
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ALSA_DLSYM(snd_strerror);
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return true;
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}
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/*
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===============
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idAudioHardwareALSA::Release
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===============
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*/
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void idAudioHardwareALSA::Release() {
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if ( m_pcm_handle ) {
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common->Printf( "close pcm\n" );
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id_snd_pcm_close( m_pcm_handle );
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m_pcm_handle = NULL;
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}
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if ( m_buffer ) {
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free( m_buffer );
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m_buffer = NULL;
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}
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if ( m_handle ) {
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common->Printf( "dlclose\n" );
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dlclose( m_handle );
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m_handle = NULL;
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}
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}
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/*
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=================
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idAudioHardwareALSA::InitFailed
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=================
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*/
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void idAudioHardwareALSA::InitFailed() {
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Release();
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cvarSystem->SetCVarBool( "s_noSound", true );
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common->Warning( "sound subsystem disabled\n" );
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common->Printf( "--------------------------------------\n" );
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}
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/*
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=====================
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idAudioHardwareALSA::Initialize
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=====================
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*/
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bool idAudioHardwareALSA::Initialize( void ) {
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int err;
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common->Printf( "------ Alsa Sound Initialization -----\n" );
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if ( !DLOpen() ) {
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InitFailed();
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return false;
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}
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if ( ( err = id_snd_pcm_open( &m_pcm_handle, s_alsa_pcm.GetString(), SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK ) ) < 0 ) {
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common->Printf( "snd_pcm_open SND_PCM_STREAM_PLAYBACK '%s' failed: %s\n", s_alsa_pcm.GetString(), id_snd_strerror( err ) );
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InitFailed();
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return false;
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}
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common->Printf( "opened Alsa PCM device %s for playback\n", s_alsa_pcm.GetString() );
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// set hardware parameters ----------------------------------------------------------------------
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// init hwparams with the full configuration space
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snd_pcm_hw_params_t *hwparams;
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// this one is a define
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id_snd_pcm_hw_params_alloca( &hwparams );
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if ( ( err = id_snd_pcm_hw_params_any( m_pcm_handle, hwparams ) ) < 0 ) {
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common->Printf( "cannot configure the PCM device: %s\n", id_snd_strerror( err ) );
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InitFailed();
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return false;
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}
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if ( ( err = id_snd_pcm_hw_params_set_access( m_pcm_handle, hwparams, SND_PCM_ACCESS_RW_INTERLEAVED ) ) < 0 ) {
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common->Printf( "SND_PCM_ACCESS_RW_INTERLEAVED failed: %s\n", id_snd_strerror( err ) );
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InitFailed();
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return false;
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}
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if ( ( err = id_snd_pcm_hw_params_set_format( m_pcm_handle, hwparams, SND_PCM_FORMAT_S16_LE ) ) < 0 ) {
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common->Printf( "SND_PCM_FORMAT_S16_LE failed: %s\n", id_snd_strerror( err ) );
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InitFailed();
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return false;
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}
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// channels
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// sanity over number of speakers
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if ( idSoundSystemLocal::s_numberOfSpeakers.GetInteger() != 6 && idSoundSystemLocal::s_numberOfSpeakers.GetInteger() != 2 ) {
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common->Warning( "invalid value for s_numberOfSpeakers. Use either 2 or 6" );
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idSoundSystemLocal::s_numberOfSpeakers.SetInteger( 2 );
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}
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m_channels = idSoundSystemLocal::s_numberOfSpeakers.GetInteger();
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if ( ( err = id_snd_pcm_hw_params_set_channels( m_pcm_handle, hwparams, m_channels ) ) < 0 ) {
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common->Printf( "error setting %d channels: %s\n", m_channels, id_snd_strerror( err ) );
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if ( idSoundSystemLocal::s_numberOfSpeakers.GetInteger() != 2 ) {
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// fallback to stereo if that works
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m_channels = 2;
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if ( ( err = id_snd_pcm_hw_params_set_channels( m_pcm_handle, hwparams, m_channels ) ) < 0 ) {
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common->Printf( "fallback to stereo failed: %s\n", id_snd_strerror( err ) );
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InitFailed();
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return false;
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} else {
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common->Printf( "fallback to stereo\n" );
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idSoundSystemLocal::s_numberOfSpeakers.SetInteger( 2 );
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}
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} else {
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InitFailed();
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return false;
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}
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}
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// set sample rate (frequency)
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if ( ( err = id_snd_pcm_hw_params_set_rate( m_pcm_handle, hwparams, PRIMARYFREQ, 0 ) ) < 0 ) {
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common->Printf( "failed to set 44.1KHz rate: %s - try ( +set s_alsa_pcm plughw:0 ? )\n", id_snd_strerror( err ) );
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InitFailed();
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return false;
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}
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// have enough space in the input buffer for our MIXBUFFER_SAMPLE feedings and async ticks
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snd_pcm_uframes_t frames;
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frames = MIXBUFFER_SAMPLES + MIXBUFFER_SAMPLES / 3;
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if ( ( err = id_snd_pcm_hw_params_set_buffer_size_min( m_pcm_handle, hwparams, &frames ) ) < 0 ) {
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common->Printf( "buffer size select failed: %s\n", id_snd_strerror( err ) );
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InitFailed();
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return false;
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}
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// apply parameters
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if ( ( err = id_snd_pcm_hw_params( m_pcm_handle, hwparams ) ) < 0 ) {
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common->Printf( "snd_pcm_hw_params failed: %s\n", id_snd_strerror( err ) );
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InitFailed();
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return false;
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}
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// check the buffer size
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if ( ( err = id_snd_pcm_hw_params_get_buffer_size( hwparams, &frames ) ) < 0 ) {
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common->Printf( "snd_pcm_hw_params_get_buffer_size failed: %s\n", id_snd_strerror( err ) );
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} else {
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common->Printf( "device buffer size: %lu frames ( %lu bytes )\n", ( long unsigned int )frames, frames * m_channels * 2 );
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}
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// TODO: can use swparams to setup the device so it doesn't underrun but rather loops over
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// snd_pcm_sw_params_set_stop_threshold
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// To get alsa to just loop on underruns. set the swparam stop_threshold to equal buffer size. The sound buffer will just loop and never throw an xrun.
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// allocate the final mix buffer
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m_buffer_size = MIXBUFFER_SAMPLES * m_channels * 2;
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m_buffer = malloc( m_buffer_size );
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common->Printf( "allocated a mix buffer of %d bytes\n", m_buffer_size );
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#ifdef _DEBUG
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// verbose the state
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snd_pcm_state_t curstate = id_snd_pcm_state( m_pcm_handle );
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assert( curstate == SND_PCM_STATE_PREPARED );
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#endif
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common->Printf( "--------------------------------------\n" );
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return true;
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}
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/*
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===============
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idAudioHardwareALSA::~idAudioHardwareALSA
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===============
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*/
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idAudioHardwareALSA::~idAudioHardwareALSA() {
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common->Printf( "----------- Alsa Shutdown ------------\n" );
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Release();
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common->Printf( "--------------------------------------\n" );
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}
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/*
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=================
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idAudioHardwareALSA::GetMixBufferSize
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=================
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*/
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int idAudioHardwareALSA::GetMixBufferSize() {
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return m_buffer_size;
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}
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/*
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=================
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idAudioHardwareALSA::GetMixBuffer
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=================
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*/
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short* idAudioHardwareALSA::GetMixBuffer() {
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return (short *)m_buffer;
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}
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/*
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===============
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idAudioHardwareALSA::Flush
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===============
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*/
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bool idAudioHardwareALSA::Flush( void ) {
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int ret;
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snd_pcm_state_t state;
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state = id_snd_pcm_state( m_pcm_handle );
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if ( state != SND_PCM_STATE_RUNNING && state != SND_PCM_STATE_PREPARED ) {
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if ( ( ret = id_snd_pcm_prepare( m_pcm_handle ) ) < 0 ) {
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Sys_Printf( "failed to recover from SND_PCM_STATE_XRUN: %s\n", id_snd_strerror( ret ) );
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cvarSystem->SetCVarBool( "s_noSound", true );
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return false;
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}
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Sys_Printf( "preparing audio device for output\n" );
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}
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Write( true );
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}
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/*
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===============
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idAudioHardwareALSA::Write
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rely on m_freeWriteChunks which has been set in Flush() before engine did the mixing for this MIXBUFFER_SAMPLE
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===============
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*/
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void idAudioHardwareALSA::Write( bool flushing ) {
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if ( !flushing && m_remainingFrames ) {
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// if we write after a new mixing loop, we should have m_writeChunk == 0
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// otherwise that last remaining chunk that was never flushed out to the audio device has just been overwritten
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Sys_Printf( "idAudioHardwareALSA::Write: %d frames overflowed and dropped\n", m_remainingFrames );
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}
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if ( !flushing ) {
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// if running after the mix loop, then we have a full buffer to write out
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m_remainingFrames = MIXBUFFER_SAMPLES;
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}
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if ( m_remainingFrames == 0 ) {
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return;
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}
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// write the max frames you can in one shot - we need to write it all out in Flush() calls before the next Write() happens
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int pos = (int)m_buffer + ( MIXBUFFER_SAMPLES - m_remainingFrames ) * m_channels * 2;
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snd_pcm_sframes_t frames = id_snd_pcm_writei( m_pcm_handle, (void*)pos, m_remainingFrames );
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if ( frames < 0 ) {
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if ( frames != -EAGAIN ) {
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Sys_Printf( "snd_pcm_writei %d frames failed: %s\n", m_remainingFrames, id_snd_strerror( frames ) );
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}
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return;
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}
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m_remainingFrames -= frames;
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}
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