mittorn
5 years ago
4 changed files with 305 additions and 6 deletions
@ -0,0 +1,295 @@
@@ -0,0 +1,295 @@
|
||||
/*
|
||||
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 BUFFER_SAMPLES 4096 |
||||
#define SUBMISSION_CHUNK BUFFER_SAMPLES / 2 |
||||
|
||||
static struct s_alsa_t |
||||
{ |
||||
snd_pcm_t *pcm_handle; |
||||
snd_pcm_hw_params_t *hw_params; |
||||
|
||||
struct sndinfo * si; |
||||
|
||||
int period_size; |
||||
} s_alsa; |
||||
|
||||
/*
|
||||
================== |
||||
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"; |
||||
|
||||
Sys_GetParmFromCmdLine( "-alsadev", device ); |
||||
|
||||
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 = BUFFER_SAMPLES / dma.format.channels; |
||||
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", ( BUFFER_SAMPLES / dma.format.channels ), p ); |
||||
dir = 0; |
||||
} |
||||
} |
||||
|
||||
// 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; |
||||
} |
||||
|
||||
// request period size again
|
||||
snd_pcm_hw_params_get_period_size( s_alsa.hw_params, &p, NULL ); |
||||
s_alsa.period_size = p; |
||||
Con_Printf( "ALSA: period size %lu\n", p ); |
||||
|
||||
dma.buffer = Z_Malloc( BUFFER_SAMPLES * 2 ); //allocate pcm frame buffer
|
||||
|
||||
dma.samplepos = 0; |
||||
|
||||
dma.samples = BUFFER_SAMPLES; |
||||
dma.format.width = 2; |
||||
dma.initialized = 1; |
||||
snd_pcm_prepare( s_alsa.pcm_handle ); |
||||
|
||||
return true; |
||||
} |
||||
|
||||
/*
|
||||
============== |
||||
SNDDMA_GetDMAPos |
||||
|
||||
return the current sample position (in mono samples read) |
||||
inside the recirculating dma buffer, so the mixing code will know |
||||
how many sample are required to fill it up. |
||||
=============== |
||||
*/ |
||||
int SNDDMA_GetDMAPos( void ) |
||||
{ |
||||
return dma.samplepos; |
||||
} |
||||
|
||||
/*
|
||||
============== |
||||
SNDDMA_GetSoundtime |
||||
|
||||
update global soundtime |
||||
=============== |
||||
*/ |
||||
int SNDDMA_GetSoundtime( void ) |
||||
{ |
||||
static int buffers, oldsamplepos; |
||||
int samplepos, fullsamples; |
||||
|
||||
fullsamples = dma.samples / 2; |
||||
|
||||
// it is possible to miscount buffers
|
||||
// if it has wrapped twice between
|
||||
// calls to S_Update. Oh well.
|
||||
samplepos = SNDDMA_GetDMAPos( ); |
||||
|
||||
if( samplepos < oldsamplepos ) |
||||
{ |
||||
buffers++; // buffer wrapped
|
||||
|
||||
if( paintedtime > 0x40000000 ) |
||||
{ |
||||
// time to chop things off to avoid 32 bit limits
|
||||
buffers = 0; |
||||
paintedtime = fullsamples; |
||||
S_StopAllSounds( true ); |
||||
} |
||||
} |
||||
|
||||
oldsamplepos = samplepos; |
||||
|
||||
return ( buffers * fullsamples + samplepos / 2 ); |
||||
} |
||||
|
||||
|
||||
/*
|
||||
============== |
||||
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 ) |
||||
{ |
||||
int avail = snd_pcm_avail_update( 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; |
||||
int wrapped = pos + len - size; |
||||
|
||||
if( wrapped < 0 ) |
||||
{ |
||||
snd_pcm_writei( s_alsa.pcm_handle, dma.buffer + pos, len / 4 ); |
||||
dma.samplepos += len >> 1; |
||||
} |
||||
else |
||||
{ |
||||
int remaining = size - pos; |
||||
snd_pcm_writei( s_alsa.pcm_handle, dma.buffer + pos, remaining / 4 ); |
||||
snd_pcm_writei( s_alsa.pcm_handle, dma.buffer, wrapped / 4 ); |
||||
dma.samplepos = wrapped >> 1; |
||||
} |
||||
|
||||
avail = snd_pcm_avail_update( s_alsa.pcm_handle ); |
||||
} |
||||
} |
||||
|
||||
/*
|
||||
============== |
||||
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 ) |
||||
{ |
||||
snd_pcm_pause( s_alsa.pcm_handle, active ); |
||||
} |
||||
|
||||
#endif |
Loading…
Reference in new issue