Xash3D FWGS engine.
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/*
s_alsa.c - alsa sound hardware output
Copyright (C) 2019 mittorn
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
*/
#include "platform/platform.h"
#if XASH_SOUND == SOUND_ALSA
#include <alsa/asoundlib.h>
#include "sound.h"
#define PERIOD_SIZE_DEFAULT 2048
static struct s_alsa_t
{
snd_pcm_t *pcm_handle;
snd_pcm_hw_params_t *hw_params;
struct sndinfo * si;
int period_size;
qboolean period_npot;
qboolean paused;
} s_alsa;
void SND_Pause_f( void )
{
s_alsa.paused = Q_atoi( Cmd_Argv( 1 ) ) ;
if( !s_alsa.paused )
{
snd_pcm_start( s_alsa.pcm_handle );
snd_pcm_prepare( s_alsa.pcm_handle );
}
else
{
snd_pcm_drain( s_alsa.pcm_handle );
snd_pcm_drop( s_alsa.pcm_handle );
}
}
/*
==================
SNDDMA_Init
Initialize ALSA pcm device, and bind it to sndinfo.
==================
*/
qboolean SNDDMA_Init( void )
{
int err, dir = 0;
unsigned int r;
snd_pcm_uframes_t p = 0;
string device = "default";
int samples;
Sys_GetParmFromCmdLine( "-alsadev", device );
Cmd_AddRestrictedCommand("pcm_pause", SND_Pause_f, "set pcm pause (debug)" );
if( ( err = snd_pcm_open( &s_alsa.pcm_handle, device, SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK ) ) < 0)
{
Con_Printf( "ALSA: cannot open device %s(%s)\n", device, snd_strerror( err ) );
return false;
}
if( ( err = snd_pcm_hw_params_malloc( &s_alsa.hw_params )) < 0 )
{
Con_Printf( "ALSA: cannot allocate hw params(%s)\n", snd_strerror( err ) );
snd_pcm_close(s_alsa.pcm_handle);
return false;
}
if( ( err = snd_pcm_hw_params_any( s_alsa.pcm_handle, s_alsa.hw_params ) ) < 0 )
{
Con_Printf( "ALSA: cannot init hw params(%s)\n", snd_strerror( err ) );
snd_pcm_hw_params_free( s_alsa.hw_params );
snd_pcm_close( s_alsa.pcm_handle );
return false;
}
if( ( err = snd_pcm_hw_params_set_access( s_alsa.pcm_handle, s_alsa.hw_params, SND_PCM_ACCESS_RW_INTERLEAVED ) ) < 0 )
{
Con_Printf( "ALSA: cannot set access(%s)\n", snd_strerror( err ) );
snd_pcm_hw_params_free( s_alsa.hw_params );
snd_pcm_close( s_alsa.pcm_handle );
return false;
}
if( ( err = snd_pcm_hw_params_set_format( s_alsa.pcm_handle, s_alsa.hw_params, SND_PCM_FORMAT_S16 ) ) < 0 )
{
Con_Printf("ALSA: 16 bit not supported\n");
snd_pcm_hw_params_free( s_alsa.hw_params );
snd_pcm_close( s_alsa.pcm_handle );
return false;
}
dma.format.speed = SOUND_DMA_SPEED;
r = dma.format.speed;
if( ( err = snd_pcm_hw_params_set_rate_near( s_alsa.pcm_handle, s_alsa.hw_params, &r, &dir ) ) < 0 )
{
Con_Printf( "ALSA: cannot set rate %d(%s)\n", r, snd_strerror( err ) );
snd_pcm_hw_params_free(s_alsa.hw_params);
snd_pcm_close( s_alsa.pcm_handle );
return false;
}
else
{
// rate succeeded, but is perhaps slightly different
if( dir != 0 )
{
Con_Printf( "ALSA: rate %d not supported, using %d\n", SOUND_DMA_SPEED, r );
dma.format.speed = r;
dir = 0;
}
}
dma.format.channels = 2;
if( ( err = snd_pcm_hw_params_set_channels(s_alsa.pcm_handle, s_alsa.hw_params, dma.format.channels ) ) < 0 )
{
Con_Printf( "ALSA: cannot set channels %d(%s)\n", 2, snd_strerror( err ) );
snd_pcm_hw_params_free( s_alsa.hw_params );
snd_pcm_close( s_alsa.pcm_handle );
return false;
}
p = PERIOD_SIZE_DEFAULT;
if( ( err = snd_pcm_hw_params_set_period_size_near( s_alsa.pcm_handle, s_alsa.hw_params, &p, &dir ) ) < 0 )
{
Con_Printf("ALSA: cannot set period size (%s)\n", snd_strerror(err));
snd_pcm_hw_params_free(s_alsa.hw_params);
snd_pcm_close( s_alsa.pcm_handle );
return false;
}
else
{
// period succeeded, but is perhaps slightly different
if( dir != 0 )
{
snd_pcm_hw_params_get_period_size(s_alsa.hw_params, &p, NULL);
Con_Printf( "ALSA: period %d not supported, using %lu\n", PERIOD_SIZE_DEFAULT, p );
dir = 0;
}
}
if( 0 ) //( p & (p - 1) ) == 0 ) // power of two
{
// normally, set samples to period * 2 to minimize latency
samples = p * 2;
}
else
{
// if period is NPOT it cannot be used as dma.samples in Xash3D
// and need more space to send buffer partially
samples = 1;
while( samples < p * 4 )
samples <<= 1;
s_alsa.period_npot = true;
}
s_alsa.period_size = p;
p = samples;
snd_pcm_hw_params_set_buffer_size_near( s_alsa.pcm_handle, s_alsa.hw_params, &p );
Con_Printf( "ALSA: buffer size %lu\n", p );
// set params
if( ( err = snd_pcm_hw_params( s_alsa.pcm_handle, s_alsa.hw_params ) ) < 0 )
{
Con_Printf( "ALSA: cannot set params(%s)\n", snd_strerror( err ) );
snd_pcm_hw_params_free(s_alsa.hw_params);
snd_pcm_close( s_alsa.pcm_handle );
return false;
}
dma.buffer = Z_Malloc( samples * 2 ); //allocate pcm frame buffer
dma.samplepos = 0;
dma.samples = samples;
dma.format.width = 2;
dma.initialized = 1;
snd_pcm_prepare( s_alsa.pcm_handle );
snd_pcm_writei( s_alsa.pcm_handle, dma.buffer, 2 * s_alsa.period_size );
snd_pcm_start( s_alsa.pcm_handle );
return true;
}
/*
==============
SNDDMA_Shutdown
Closes the ALSA pcm device and frees the dma buffer.
===============
*/
void SNDDMA_Shutdown(void)
{
Con_Printf( "Shutting down audio.\n" );
dma.initialized = false;
if( dma.buffer )
{
snd_pcm_drop( s_alsa.pcm_handle );
snd_pcm_close( s_alsa.pcm_handle );
Mem_Free( dma.buffer );
dma.buffer = NULL;
}
}
/*
==============
SNDDMA_Submit
Send sound to device if buffer isn't really the dma buffer
===============
*/
void SNDDMA_Submit( void )
{
if( s_alsa.paused )
return;
if( s_alsa.period_npot )
{
int avail = snd_pcm_avail_update( s_alsa.pcm_handle );
if( avail < 0 )
snd_pcm_prepare( s_alsa.pcm_handle );
while( avail >= s_alsa.period_size )
{
int size = dma.samples << 1;
int pos = dma.samplepos << 1;
unsigned long len = s_alsa.period_size * 4;
int wrapped = pos + len - size;
int w;
if( wrapped < 0 )
{
w = snd_pcm_writei( s_alsa.pcm_handle, dma.buffer + pos, len / 4 );
if( w < 0 )
{
snd_pcm_prepare(s_alsa.pcm_handle);
return;
}
dma.samplepos += len >> 1;
}
else
{
int remaining = size - pos;
w = snd_pcm_writei( s_alsa.pcm_handle, dma.buffer + pos, remaining / 4 );
if( w < 0 )
{
snd_pcm_prepare(s_alsa.pcm_handle);
return;
}
w = snd_pcm_writei( s_alsa.pcm_handle, dma.buffer, wrapped / 4 );
if( w < 0 )
{
snd_pcm_prepare(s_alsa.pcm_handle);
return;
}
dma.samplepos = wrapped >> 1;
}
avail = snd_pcm_avail_update( s_alsa.pcm_handle );
}
}
else // period is 1/2 of samples
{
int s, w, frames;
void *start;
if( !dma.buffer )
return;
s = dma.samplepos * 2;
start = (void *)&dma.buffer[s];
frames = s_alsa.period_size / 2;
// write to card
if( ( w = snd_pcm_writei( s_alsa.pcm_handle, start, frames ) ) < 0)
{
// xrun occured
snd_pcm_prepare( s_alsa.pcm_handle );
return;
}
dma.samplepos += w * 2; // mark progress
if(dma.samplepos >= dma.samples)
dma.samplepos = 0; // wrap buffer
}
}
/*
==============
SNDDMA_BeginPainting
Callback provided by the engine in case we need it. We don't.
==============
*/
void SNDDMA_BeginPainting(void)
{
}
/*
===========
SNDDMA_Activate
Called when the main window gains or loses focus.
The window have been destroyed and recreated
between a deactivate and an activate.
===========
*/
void SNDDMA_Activate( qboolean active )
{
if( !dma.initialized )
return;
s_alsa.paused = !active;
if( !s_alsa.paused )
{
snd_pcm_start( s_alsa.pcm_handle );
snd_pcm_prepare( s_alsa.pcm_handle );
}
else
{
snd_pcm_drain( s_alsa.pcm_handle );
snd_pcm_drop( s_alsa.pcm_handle );
}
}
#endif