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364 lines
8.1 KiB
364 lines
8.1 KiB
/* |
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s_alsa.c - alsa sound hardware output |
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Copyright (C) 2019 mittorn |
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This program 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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This program 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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*/ |
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#include "platform/platform.h" |
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#if XASH_SOUND == SOUND_ALSA |
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#include <alsa/asoundlib.h> |
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#include "sound.h" |
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#define PERIOD_SIZE_DEFAULT 2048 |
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static struct s_alsa_t |
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{ |
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snd_pcm_t *pcm_handle; |
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snd_pcm_hw_params_t *hw_params; |
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struct sndinfo * si; |
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int period_size; |
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qboolean period_npot; |
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qboolean paused; |
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} s_alsa; |
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void SND_Pause_f( void ) |
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{ |
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s_alsa.paused = Q_atoi( Cmd_Argv( 1 ) ) ; |
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if( !s_alsa.paused ) |
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{ |
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snd_pcm_start( s_alsa.pcm_handle ); |
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snd_pcm_prepare( s_alsa.pcm_handle ); |
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} |
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else |
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{ |
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snd_pcm_drain( s_alsa.pcm_handle ); |
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snd_pcm_drop( s_alsa.pcm_handle ); |
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} |
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} |
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/* |
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================== |
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SNDDMA_Init |
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Initialize ALSA pcm device, and bind it to sndinfo. |
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================== |
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*/ |
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qboolean SNDDMA_Init( void ) |
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{ |
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int err, dir = 0; |
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unsigned int r; |
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snd_pcm_uframes_t p = 0; |
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string device = "default"; |
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int samples; |
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Sys_GetParmFromCmdLine( "-alsadev", device ); |
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Cmd_AddRestrictedCommand("pcm_pause", SND_Pause_f, "set pcm pause (debug)" ); |
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if( ( err = snd_pcm_open( &s_alsa.pcm_handle, device, SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK ) ) < 0) |
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{ |
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Con_Printf( "ALSA: cannot open device %s(%s)\n", device, snd_strerror( err ) ); |
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return false; |
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} |
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if( ( err = snd_pcm_hw_params_malloc( &s_alsa.hw_params )) < 0 ) |
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{ |
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Con_Printf( "ALSA: cannot allocate hw params(%s)\n", snd_strerror( err ) ); |
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snd_pcm_close(s_alsa.pcm_handle); |
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return false; |
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} |
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if( ( err = snd_pcm_hw_params_any( s_alsa.pcm_handle, s_alsa.hw_params ) ) < 0 ) |
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{ |
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Con_Printf( "ALSA: cannot init hw params(%s)\n", snd_strerror( err ) ); |
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snd_pcm_hw_params_free( s_alsa.hw_params ); |
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snd_pcm_close( s_alsa.pcm_handle ); |
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return false; |
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} |
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if( ( err = snd_pcm_hw_params_set_access( s_alsa.pcm_handle, s_alsa.hw_params, SND_PCM_ACCESS_RW_INTERLEAVED ) ) < 0 ) |
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{ |
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Con_Printf( "ALSA: cannot set access(%s)\n", snd_strerror( err ) ); |
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snd_pcm_hw_params_free( s_alsa.hw_params ); |
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snd_pcm_close( s_alsa.pcm_handle ); |
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return false; |
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} |
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if( ( err = snd_pcm_hw_params_set_format( s_alsa.pcm_handle, s_alsa.hw_params, SND_PCM_FORMAT_S16 ) ) < 0 ) |
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{ |
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Con_Printf("ALSA: 16 bit not supported\n"); |
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snd_pcm_hw_params_free( s_alsa.hw_params ); |
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snd_pcm_close( s_alsa.pcm_handle ); |
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return false; |
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} |
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dma.format.speed = SOUND_DMA_SPEED; |
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r = dma.format.speed; |
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if( ( err = snd_pcm_hw_params_set_rate_near( s_alsa.pcm_handle, s_alsa.hw_params, &r, &dir ) ) < 0 ) |
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{ |
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Con_Printf( "ALSA: cannot set rate %d(%s)\n", r, snd_strerror( err ) ); |
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snd_pcm_hw_params_free(s_alsa.hw_params); |
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snd_pcm_close( s_alsa.pcm_handle ); |
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return false; |
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} |
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else |
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{ |
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// rate succeeded, but is perhaps slightly different |
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if( dir != 0 ) |
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{ |
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Con_Printf( "ALSA: rate %d not supported, using %d\n", SOUND_DMA_SPEED, r ); |
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dma.format.speed = r; |
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dir = 0; |
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} |
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} |
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dma.format.channels = 2; |
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if( ( err = snd_pcm_hw_params_set_channels(s_alsa.pcm_handle, s_alsa.hw_params, dma.format.channels ) ) < 0 ) |
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{ |
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Con_Printf( "ALSA: cannot set channels %d(%s)\n", 2, snd_strerror( err ) ); |
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snd_pcm_hw_params_free( s_alsa.hw_params ); |
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snd_pcm_close( s_alsa.pcm_handle ); |
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return false; |
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} |
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p = PERIOD_SIZE_DEFAULT; |
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if( ( err = snd_pcm_hw_params_set_period_size_near( s_alsa.pcm_handle, s_alsa.hw_params, &p, &dir ) ) < 0 ) |
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{ |
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Con_Printf("ALSA: cannot set period size (%s)\n", snd_strerror(err)); |
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snd_pcm_hw_params_free(s_alsa.hw_params); |
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snd_pcm_close( s_alsa.pcm_handle ); |
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return false; |
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} |
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else |
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{ |
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// period succeeded, but is perhaps slightly different |
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if( dir != 0 ) |
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{ |
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snd_pcm_hw_params_get_period_size(s_alsa.hw_params, &p, NULL); |
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Con_Printf( "ALSA: period %d not supported, using %lu\n", PERIOD_SIZE_DEFAULT, p ); |
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dir = 0; |
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} |
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} |
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if( 0 ) //( p & (p - 1) ) == 0 ) // power of two |
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{ |
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// normally, set samples to period * 2 to minimize latency |
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samples = p * 2; |
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} |
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else |
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{ |
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// if period is NPOT it cannot be used as dma.samples in Xash3D |
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// and need more space to send buffer partially |
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samples = 1; |
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while( samples < p * 4 ) |
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samples <<= 1; |
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s_alsa.period_npot = true; |
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} |
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s_alsa.period_size = p; |
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p = samples; |
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snd_pcm_hw_params_set_buffer_size_near( s_alsa.pcm_handle, s_alsa.hw_params, &p ); |
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Con_Printf( "ALSA: buffer size %lu\n", p ); |
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// set params |
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if( ( err = snd_pcm_hw_params( s_alsa.pcm_handle, s_alsa.hw_params ) ) < 0 ) |
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{ |
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Con_Printf( "ALSA: cannot set params(%s)\n", snd_strerror( err ) ); |
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snd_pcm_hw_params_free(s_alsa.hw_params); |
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snd_pcm_close( s_alsa.pcm_handle ); |
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return false; |
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} |
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dma.buffer = Z_Malloc( samples * 2 ); //allocate pcm frame buffer |
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dma.samplepos = 0; |
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dma.samples = samples; |
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dma.format.width = 2; |
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dma.initialized = 1; |
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dma.backendName = "ALSA"; |
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snd_pcm_prepare( s_alsa.pcm_handle ); |
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snd_pcm_writei( s_alsa.pcm_handle, dma.buffer, 2 * s_alsa.period_size ); |
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snd_pcm_start( s_alsa.pcm_handle ); |
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return true; |
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} |
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/* |
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============== |
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SNDDMA_Shutdown |
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Closes the ALSA pcm device and frees the dma buffer. |
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=============== |
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*/ |
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void SNDDMA_Shutdown(void) |
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{ |
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Con_Printf( "Shutting down audio.\n" ); |
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dma.initialized = false; |
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if( dma.buffer ) |
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{ |
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snd_pcm_drop( s_alsa.pcm_handle ); |
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snd_pcm_close( s_alsa.pcm_handle ); |
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Mem_Free( dma.buffer ); |
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dma.buffer = NULL; |
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} |
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} |
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/* |
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============== |
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SNDDMA_Submit |
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Send sound to device if buffer isn't really the dma buffer |
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=============== |
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*/ |
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void SNDDMA_Submit( void ) |
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{ |
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if( s_alsa.paused ) |
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return; |
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if( s_alsa.period_npot ) |
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{ |
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int avail = snd_pcm_avail_update( s_alsa.pcm_handle ); |
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if( avail < 0 ) |
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snd_pcm_prepare( s_alsa.pcm_handle ); |
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while( avail >= s_alsa.period_size ) |
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{ |
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int size = dma.samples << 1; |
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int pos = dma.samplepos << 1; |
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unsigned long len = s_alsa.period_size * 4; |
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int wrapped = pos + len - size; |
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int w; |
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if( wrapped < 0 ) |
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{ |
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w = snd_pcm_writei( s_alsa.pcm_handle, dma.buffer + pos, len / 4 ); |
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if( w < 0 ) |
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{ |
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snd_pcm_prepare(s_alsa.pcm_handle); |
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return; |
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} |
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dma.samplepos += len >> 1; |
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} |
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else |
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{ |
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int remaining = size - pos; |
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w = snd_pcm_writei( s_alsa.pcm_handle, dma.buffer + pos, remaining / 4 ); |
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if( w < 0 ) |
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{ |
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snd_pcm_prepare(s_alsa.pcm_handle); |
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return; |
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} |
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w = snd_pcm_writei( s_alsa.pcm_handle, dma.buffer, wrapped / 4 ); |
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if( w < 0 ) |
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{ |
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snd_pcm_prepare(s_alsa.pcm_handle); |
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return; |
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} |
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dma.samplepos = wrapped >> 1; |
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} |
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avail = snd_pcm_avail_update( s_alsa.pcm_handle ); |
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} |
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} |
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else // period is 1/2 of samples |
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{ |
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int s, w, frames; |
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void *start; |
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if( !dma.buffer ) |
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return; |
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s = dma.samplepos * 2; |
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start = (void *)&dma.buffer[s]; |
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frames = s_alsa.period_size / 2; |
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// write to card |
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if( ( w = snd_pcm_writei( s_alsa.pcm_handle, start, frames ) ) < 0) |
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{ |
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// xrun occured |
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snd_pcm_prepare( s_alsa.pcm_handle ); |
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return; |
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} |
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dma.samplepos += w * 2; // mark progress |
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if(dma.samplepos >= dma.samples) |
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dma.samplepos = 0; // wrap buffer |
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} |
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} |
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/* |
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============== |
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SNDDMA_BeginPainting |
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Callback provided by the engine in case we need it. We don't. |
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============== |
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*/ |
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void SNDDMA_BeginPainting(void) |
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{ |
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} |
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/* |
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=========== |
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SNDDMA_Activate |
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Called when the main window gains or loses focus. |
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The window have been destroyed and recreated |
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between a deactivate and an activate. |
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=========== |
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*/ |
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void SNDDMA_Activate( qboolean active ) |
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{ |
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if( !dma.initialized ) |
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return; |
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s_alsa.paused = !active; |
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if( !s_alsa.paused ) |
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{ |
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snd_pcm_start( s_alsa.pcm_handle ); |
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snd_pcm_prepare( s_alsa.pcm_handle ); |
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} |
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else |
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{ |
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snd_pcm_drain( s_alsa.pcm_handle ); |
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snd_pcm_drop( s_alsa.pcm_handle ); |
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} |
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} |
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qboolean VoiceCapture_Init( void ) |
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{ |
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return false; |
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} |
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qboolean VoiceCapture_Activate( qboolean activate ) |
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{ |
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return false; |
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} |
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qboolean VoiceCapture_Lock( qboolean lock ) |
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{ |
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return false; |
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} |
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void VoiceCapture_Shutdown( void ) |
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{ |
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} |
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#endif
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