quakeforge/libs/audio/targets/snd_sdl.c

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/*
snd_sdl.c
(description)
Copyright (C) 1996-1997 Id Software, Inc.
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:
Free Software Foundation, Inc.
59 Temple Place - Suite 330
Boston, MA 02111-1307, USA
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
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#ifdef HAVE_STRING_H
# include <string.h>
#endif
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif
#include <SDL.h>
#include <SDL_audio.h>
#include <stdlib.h>
#include "QF/cmd.h"
#include "QF/cvar.h"
#include "QF/qargs.h"
#include "QF/sys.h"
#include "snd_internal.h"
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static dma_t sn;
static int snd_inited;
static int snd_blocked;
static unsigned shm_buflen;
static unsigned char *shm_buf;
static unsigned shm_rpos;
static unsigned wpos;
static cvar_t *snd_bits;
static cvar_t *snd_rate;
static cvar_t *snd_stereo;
static plugin_t plugin_info;
static plugin_data_t plugin_info_data;
static plugin_funcs_t plugin_info_funcs;
static general_data_t plugin_info_general_data;
static general_funcs_t plugin_info_general_funcs;
static snd_output_data_t plugin_info_snd_output_data;
static snd_output_funcs_t plugin_info_snd_output_funcs;
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static void
paint_audio (void *unused, Uint8 * stream, int len)
{
while (shm_rpos + len > shm_buflen) {
memcpy (stream, shm_buf + shm_rpos, shm_buflen - shm_rpos);
stream += shm_buflen - shm_rpos;
len -= shm_buflen - shm_rpos;
shm_rpos = 0;
}
if (len) {
memcpy (stream, shm_buf + shm_rpos, len);
shm_rpos += len;
}
}
static void
SNDDMA_Init_Cvars (void)
{
snd_stereo = Cvar_Get ("snd_stereo", "1", CVAR_ROM, NULL,
"sound stereo output");
snd_rate = Cvar_Get ("snd_rate", "0", CVAR_ROM, NULL,
"sound playback rate. 0 is system default");
snd_bits = Cvar_Get ("snd_bits", "0", CVAR_ROM, NULL,
"sound sample depth. 0 is system default");
}
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static volatile dma_t *
SNDDMA_Init (void)
{
SDL_AudioSpec desired, obtained;
if (snd_inited)
return &sn;
if (SDL_Init (SDL_INIT_AUDIO) < 0) {
Sys_Printf ("Couldn't initialize SDL AUDIO: %s\n", SDL_GetError ());
return 0;
};
/* Set up the desired format */
desired.freq = 22050;
if (snd_rate->int_val)
desired.freq = snd_rate->int_val;
switch (snd_bits->int_val) {
case 8:
desired.format = AUDIO_U8;
break;
case 0: // default is 16 bits per sample
case 16:
if (SDL_BYTEORDER == SDL_BIG_ENDIAN)
desired.format = AUDIO_S16MSB;
else
desired.format = AUDIO_S16LSB;
break;
default:
Sys_Printf ("Unknown number of audio bits: %d\n",
snd_bits->int_val);
return 0;
}
desired.channels = snd_stereo->int_val ? 2 : 1;
desired.samples = 1024;
desired.callback = paint_audio;
/* Open the audio device */
if (SDL_OpenAudio (&desired, &obtained) < 0) {
Sys_Printf ("Couldn't open SDL audio: %s\n", SDL_GetError ());
return 0;
}
/* Make sure we can support the audio format */
switch (obtained.format) {
case AUDIO_U8:
/* Supported */
break;
case AUDIO_S16LSB:
case AUDIO_S16MSB:
if (((obtained.format == AUDIO_S16LSB) &&
(SDL_BYTEORDER == SDL_LIL_ENDIAN)) ||
((obtained.format == AUDIO_S16MSB) &&
(SDL_BYTEORDER == SDL_BIG_ENDIAN))) {
/* Supported */
break;
}
/* Unsupported, fall through */ ;
default:
/* Not supported -- force SDL to do our bidding */
SDL_CloseAudio ();
if (SDL_OpenAudio (&desired, NULL) < 0) {
Sys_Printf ("Couldn't open SDL audio: %s\n", SDL_GetError ());
return 0;
}
memcpy (&obtained, &desired, sizeof (desired));
break;
}
/* Fill the audio DMA information block */
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sn.samplebits = (obtained.format & 0xFF);
sn.speed = obtained.freq;
sn.channels = obtained.channels;
sn.frames = obtained.samples * 8; // 8 chunks in the buffer
sn.framepos = 0;
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sn.submission_chunk = 1;
shm_buflen = sn.frames * sn.channels * (sn.samplebits / 8);
sn.buffer = calloc (shm_buflen, 1);
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if (!sn.buffer)
Sys_Error ("Failed to allocate buffer for sound!");
shm_buf = calloc (shm_buflen, 1);
if (!shm_buf)
Sys_Error ("Failed to allocate buffer for sound!");
shm_rpos = wpos = 0;
if (!snd_blocked)
SDL_PauseAudio (0);
snd_inited = 1;
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return &sn;
}
static int
SNDDMA_GetDMAPos (void)
{
if (!snd_inited)
return 0;
SDL_LockAudio ();
sn.framepos = shm_rpos / (sn.channels * (sn.samplebits / 8));
SDL_UnlockAudio ();
return sn.framepos;
}
static void
SNDDMA_Shutdown (void)
{
if (snd_inited) {
SDL_CloseAudio ();
free (sn.buffer);
free (shm_buf);
snd_inited = 0;
}
}
/*
SNDDMA_Submit
Send sound to device if buffer isn't really the dma buffer
*/
static void
SNDDMA_Submit (void)
{
static unsigned old_paintedtime;
unsigned len;
if (!snd_inited || snd_blocked)
return;
SDL_LockAudio ();
if (*plugin_info_snd_output_data.paintedtime < old_paintedtime)
old_paintedtime = 0;
len = (*plugin_info_snd_output_data.paintedtime - old_paintedtime) *
sn.channels * (sn.samplebits / 8);
old_paintedtime = *plugin_info_snd_output_data.paintedtime;
while (wpos + len > shm_buflen) {
memcpy (shm_buf + wpos, sn.buffer + wpos, shm_buflen - wpos);
len -= shm_buflen - wpos;
wpos = 0;
}
if (len) {
memcpy (shm_buf + wpos, sn.buffer + wpos, len);
wpos += len;
}
SDL_UnlockAudio ();
}
static void
SNDDMA_BlockSound (void)
{
if (!snd_inited)
return;
if (++snd_blocked == 1)
SDL_PauseAudio (1);
}
static void
SNDDMA_UnblockSound (void)
{
if (!snd_inited || !snd_blocked)
return;
if (!--snd_blocked)
SDL_PauseAudio (0);
}
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PLUGIN_INFO(snd_output, sdl)
{
plugin_info.type = qfp_snd_output;
plugin_info.api_version = QFPLUGIN_VERSION;
plugin_info.plugin_version = "0.1";
plugin_info.description = "SDL digital output";
plugin_info.copyright = "Copyright (C) 1996-1997 id Software, Inc.\n"
"Copyright (C) 1999,2000,2001,2012 contributors of the QuakeForge "
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"project\n"
"Please see the file \"AUTHORS\" for a list of contributors";
plugin_info.functions = &plugin_info_funcs;
plugin_info.data = &plugin_info_data;
plugin_info_data.general = &plugin_info_general_data;
plugin_info_data.input = NULL;
plugin_info_data.snd_output = &plugin_info_snd_output_data;
plugin_info_funcs.general = &plugin_info_general_funcs;
plugin_info_funcs.input = NULL;
plugin_info_funcs.snd_output = &plugin_info_snd_output_funcs;
plugin_info_general_funcs.p_Init = SNDDMA_Init_Cvars;
plugin_info_general_funcs.p_Shutdown = NULL;
plugin_info_snd_output_funcs.pS_O_Init = SNDDMA_Init;
plugin_info_snd_output_funcs.pS_O_Shutdown = SNDDMA_Shutdown;
plugin_info_snd_output_funcs.pS_O_GetDMAPos = SNDDMA_GetDMAPos;
plugin_info_snd_output_funcs.pS_O_Submit = SNDDMA_Submit;
plugin_info_snd_output_funcs.pS_O_BlockSound = SNDDMA_BlockSound;
plugin_info_snd_output_funcs.pS_O_UnblockSound = SNDDMA_UnblockSound;
return &plugin_info;
}