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/*
Copyright (C) 2003-2007 Andrey Nazarov
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 2
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.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
//
// snd_sdl.c
//
#include "com_local.h"
#include "snd_local.h"
#include <SDL.h>
static void filler( void *userdata, Uint8 *stream, int len ) {
int size = dma.samples << 1;
int pos = dma.samplepos << 1;
int wrapped = pos + len - size;
if( wrapped < 0 ) {
memcpy( stream, dma.buffer + pos, len );
dma.samplepos += len >> 1;
} else {
int remaining = size - pos;
memcpy( stream, dma.buffer + pos, remaining );
memcpy( stream + remaining, dma.buffer, wrapped );
dma.samplepos = wrapped >> 1;
}
}
static void QSDL_ShutdownSound( void ) {
Com_Printf( "Shutting down SDL audio\n" );
SDL_CloseAudio();
if( SDL_WasInit( SDL_INIT_EVERYTHING ) == SDL_INIT_AUDIO ) {
SDL_Quit();
} else {
SDL_QuitSubSystem( SDL_INIT_AUDIO );
}
if( dma.buffer ) {
Z_Free( dma.buffer );
dma.buffer = NULL;
}
}
static sndinitstat_t QSDL_InitSound( void ) {
SDL_AudioSpec desired, obtained;
char buffer[MAX_QPATH];
int ret;
if( SDL_WasInit( SDL_INIT_EVERYTHING ) == 0 ) {
ret = SDL_Init( SDL_INIT_AUDIO|SDL_INIT_NOPARACHUTE );
} else {
ret = SDL_InitSubSystem( SDL_INIT_AUDIO );
}
if( ret == -1 ) {
Com_EPrintf( "Couldn't initialize SDL audio: %s\n", SDL_GetError() );
return SIS_FAILURE;
}
memset( &desired, 0, sizeof( desired ) );
switch( s_khz->integer ) {
case 48:
desired.freq = 48000;
break;
case 44:
desired.freq = 44100;
break;
case 22:
desired.freq = 22050;
break;
default:
desired.freq = 11025;
break;
}
desired.format = AUDIO_S16LSB;
desired.samples = 512;
desired.channels = 2;
desired.callback = filler;
ret = SDL_OpenAudio( &desired, &obtained );
if( ret == -1 ) {
Com_EPrintf( "Couldn't open SDL audio: %s\n", SDL_GetError() );
return SIS_FAILURE;
}
if( obtained.format != AUDIO_S16LSB ) {
Com_EPrintf( "SDL audio format %d unsupported\n", obtained.format );
QSDL_ShutdownSound();
return SIS_FAILURE;
}
dma.speed = obtained.freq;
dma.channels = obtained.channels;
dma.samples = 2048 * obtained.channels;
dma.submission_chunk = 1;
dma.samplebits = 16;
dma.buffer = Z_Malloc( dma.samples * 2 );
dma.samplepos = 0;
Com_Printf( "Using SDL audio driver: %s\n",
SDL_AudioDriverName( buffer, sizeof( buffer ) ) );
SDL_PauseAudio( 0 );
return SIS_SUCCESS;
}
static void QSDL_BeginPainting( void ) {
SDL_LockAudio();
}
static void QSDL_Submit( void ) {
SDL_UnlockAudio();
}
static void QSDL_ActivateSound( qboolean active ) {
if( active ) {
SDL_PauseAudio( 0 );
} else {
SDL_PauseAudio( 1 );
}
}
void QSDL_FillSoundAPI ( snddmaAPI_t *api ) {
api->Init = QSDL_InitSound;
api->Shutdown = QSDL_ShutdownSound;
api->BeginPainting = QSDL_BeginPainting;
api->Submit = QSDL_Submit;
api->Activate = QSDL_ActivateSound;
}
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