mirror of
https://github.com/Shpoike/Quakespasm.git
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126 lines
3 KiB
C
126 lines
3 KiB
C
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/*
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Copyright (C) 1996-2001 Id Software, Inc.
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Copyright (C) 2002-2005 John Fitzgibbons and others
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Copyright (C) 2007-2008 Kristian Duske
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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 the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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// stolen from http://www.libsdl.org/projects/quake/ -- apologies, I don't know the author's name
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#include <stdio.h>
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#include "quakedef.h"
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static dma_t the_shm;
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static int snd_inited;
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#define BUF_SIZE 512
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static void 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)/2;
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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 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 = sndspeed.value;
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if (loadas8bit.value) {
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desired.format = AUDIO_U8;
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} else {
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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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}
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desired.channels = 2;
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desired.samples = BUF_SIZE;
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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",
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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 SNDDMA_GetDMAPos(void)
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{
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return shm->samplepos;
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}
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void SNDDMA_Shutdown(void)
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{
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if (snd_inited)
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{
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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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