mirror of
https://git.code.sf.net/p/quake/quakeforge
synced 2024-11-23 21:02:50 +00:00
158 lines
3.2 KiB
C
158 lines
3.2 KiB
C
/*
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snd_sdl.c
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(description)
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Copyright (C) 1996-1997 Id Software, Inc.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (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.
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See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to:
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Free Software Foundation, Inc.
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59 Temple Place - Suite 330
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Boston, MA 02111-1307, USA
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$Id$
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <SDL_audio.h>
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#include <SDL_byteorder.h>
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#include "QF/cmd.h"
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#include "QF/console.h"
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#include "QF/qargs.h"
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#include "sound.h"
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static dma_t the_shm;
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static int snd_inited;
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extern int desired_speed;
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extern int desired_bits;
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static void
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paint_audio (void *unused, Uint8 * stream, int len)
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{
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if (shm) {
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shm->buffer = stream;
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shm->samplepos += len / (shm->samplebits / 8);
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// Check for samplepos overflow?
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S_PaintChannels (shm->samplepos);
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}
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}
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qboolean
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SNDDMA_Init (void)
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{
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SDL_AudioSpec desired, obtained;
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snd_inited = 0;
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/* Set up the desired format */
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desired.freq = desired_speed;
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switch (desired_bits) {
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case 8:
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desired.format = AUDIO_U8;
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break;
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case 16:
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if (SDL_BYTEORDER == SDL_BIG_ENDIAN)
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desired.format = AUDIO_S16MSB;
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else
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desired.format = AUDIO_S16LSB;
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break;
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default:
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Con_Printf ("Unknown number of audio bits: %d\n", desired_bits);
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return 0;
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}
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desired.channels = 2;
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desired.samples = 512;
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desired.callback = paint_audio;
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/* Open the audio device */
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if (SDL_OpenAudio (&desired, &obtained) < 0) {
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Con_Printf ("Couldn't open SDL audio: %s\n", SDL_GetError ());
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return 0;
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}
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/* Make sure we can support the audio format */
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switch (obtained.format) {
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case AUDIO_U8:
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/* Supported */
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break;
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case AUDIO_S16LSB:
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case AUDIO_S16MSB:
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if (((obtained.format == AUDIO_S16LSB) &&
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(SDL_BYTEORDER == SDL_LIL_ENDIAN)) ||
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((obtained.format == AUDIO_S16MSB) &&
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(SDL_BYTEORDER == SDL_BIG_ENDIAN))) {
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/* Supported */
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break;
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}
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/* Unsupported, fall through */ ;
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default:
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/* Not supported -- force SDL to do our bidding */
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SDL_CloseAudio ();
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if (SDL_OpenAudio (&desired, NULL) < 0) {
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Con_Printf ("Couldn't open SDL audio: %s\n", SDL_GetError ());
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return 0;
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}
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memcpy (&obtained, &desired, sizeof (desired));
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break;
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}
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SDL_PauseAudio (0);
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/* Fill the audio DMA information block */
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shm = &the_shm;
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shm->splitbuffer = 0;
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shm->samplebits = (obtained.format & 0xFF);
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shm->speed = obtained.freq;
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shm->channels = obtained.channels;
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shm->samples = obtained.samples * shm->channels;
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shm->samplepos = 0;
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shm->submission_chunk = 1;
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shm->buffer = NULL;
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snd_inited = 1;
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return 1;
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}
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int
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SNDDMA_GetDMAPos (void)
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{
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return shm->samplepos;
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}
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void
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SNDDMA_Shutdown (void)
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{
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if (snd_inited) {
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SDL_CloseAudio ();
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snd_inited = 0;
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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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void
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SNDDMA_Submit (void)
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{
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}
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