264 lines
6.3 KiB
C
264 lines
6.3 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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*/
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static const char rcsid[] =
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"$Id$";
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#ifdef HAVE_STRING_H
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# include <string.h>
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#endif
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#ifdef HAVE_STRINGS_H
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# include <strings.h>
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#endif
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#include <SDL.h>
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#include <SDL_audio.h>
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#include <SDL_byteorder.h>
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#include <stdlib.h>
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#include "QF/cmd.h"
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#include "QF/plugin.h"
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#include "QF/qargs.h"
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#include "QF/sound.h"
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#include "QF/sys.h"
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static dma_t the_shm;
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static int snd_inited;
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static int snd_blocked = 0;
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static int desired_speed = 11025;
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static int desired_bits = 16;
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static plugin_t plugin_info;
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static plugin_data_t plugin_info_data;
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static plugin_funcs_t plugin_info_funcs;
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static general_data_t plugin_info_general_data;
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static general_funcs_t plugin_info_general_funcs;
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static snd_output_data_t plugin_info_snd_output_data;
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static snd_output_funcs_t plugin_info_snd_output_funcs;
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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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int sampleposbytes, samplesbytes, streamsamples;
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if (shm) {
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streamsamples = len / (shm->samplebits / 8);
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sampleposbytes = shm->samplepos * (shm->samplebits / 8);
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samplesbytes = shm->samples * (shm->samplebits / 8);
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shm->samplepos += streamsamples;
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while (shm->samplepos >= shm->samples)
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shm->samplepos -= shm->samples;
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// SND_PaintChannels (*plugin_info_snd_output_data.soundtime + streamsamples);
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if (shm->samplepos + streamsamples <= shm->samples)
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memcpy (stream, shm->buffer + sampleposbytes, len);
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else {
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memcpy (stream, shm->buffer + sampleposbytes, samplesbytes -
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sampleposbytes);
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memcpy (stream + samplesbytes - sampleposbytes, shm->buffer, len -
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(samplesbytes - sampleposbytes));
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}
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*plugin_info_snd_output_data.soundtime += streamsamples;
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}
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}
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static void
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SNDDMA_Init_Cvars (void)
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{
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}
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static 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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if (SDL_Init (SDL_INIT_AUDIO) < 0) {
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Sys_Printf ("Couldn't initialize SDL AUDIO: %s\n", SDL_GetError ());
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return 0;
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};
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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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Sys_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 = 1024;
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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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Sys_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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Sys_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_LockAudio();
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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 * 16;
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shm->samplepos = 0;
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shm->submission_chunk = 1;
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shm->buffer = calloc(shm->samples * (shm->samplebits / 8), 1);
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if (!shm->buffer)
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{
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Sys_Error ("Failed to allocate buffer for sound!");
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}
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snd_inited = 1;
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return 1;
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}
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static 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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static void
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SNDDMA_Shutdown (void)
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{
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if (snd_inited) {
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SDL_PauseAudio (1);
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SDL_UnlockAudio ();
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SDL_CloseAudio ();
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snd_inited = 0;
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shm = NULL;
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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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static void
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SNDDMA_Submit (void)
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{
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if (snd_blocked)
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return;
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SDL_UnlockAudio();
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SDL_LockAudio();
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}
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static void
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SNDDMA_BlockSound (void)
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{
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++snd_blocked;
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}
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static void
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SNDDMA_UnblockSound (void)
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{
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if (!snd_blocked)
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return;
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--snd_blocked;
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}
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QFPLUGIN plugin_t *
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PLUGIN_INFO(snd_output, sdl) (void)
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{
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plugin_info.type = qfp_snd_output;
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plugin_info.api_version = QFPLUGIN_VERSION;
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plugin_info.plugin_version = "0.1";
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plugin_info.description = "SDL digital output";
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plugin_info.copyright = "Copyright (C) 1996-1997 id Software, Inc.\n"
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"Copyright (C) 1999,2000,2001 contributors of the QuakeForge "
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"project\n"
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"Please see the file \"AUTHORS\" for a list of contributors";
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plugin_info.functions = &plugin_info_funcs;
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plugin_info.data = &plugin_info_data;
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plugin_info_data.general = &plugin_info_general_data;
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plugin_info_data.input = NULL;
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plugin_info_data.snd_output = &plugin_info_snd_output_data;
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plugin_info_funcs.general = &plugin_info_general_funcs;
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plugin_info_funcs.input = NULL;
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plugin_info_funcs.snd_output = &plugin_info_snd_output_funcs;
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plugin_info_general_funcs.p_Init = SNDDMA_Init_Cvars;
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plugin_info_general_funcs.p_Shutdown = NULL;
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plugin_info_snd_output_funcs.pS_O_Init = SNDDMA_Init;
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plugin_info_snd_output_funcs.pS_O_Shutdown = SNDDMA_Shutdown;
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plugin_info_snd_output_funcs.pS_O_GetDMAPos = SNDDMA_GetDMAPos;
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plugin_info_snd_output_funcs.pS_O_Submit = SNDDMA_Submit;
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plugin_info_snd_output_funcs.pS_O_BlockSound = SNDDMA_BlockSound;
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plugin_info_snd_output_funcs.pS_O_UnblockSound = SNDDMA_UnblockSound;
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return &plugin_info;
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}
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