mirror of
https://git.code.sf.net/p/quake/quakeforge
synced 2024-11-10 23:32:09 +00:00
4e4d1b99b4
I added Sys_RegisterShutdown years ago and never really did anything with it: now any system that needs to be shutdown can ensure it gets shutdown on program exit, and in the correct order (ie, reverse to init order).
307 lines
7.2 KiB
C
307 lines
7.2 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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*/
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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 <stdlib.h>
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#include "QF/cmd.h"
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#include "QF/cvar.h"
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#include "QF/qargs.h"
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#include "QF/sys.h"
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#include "snd_internal.h"
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static dma_t sn;
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static int snd_inited;
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static int snd_blocked;
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static unsigned shm_buflen;
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static unsigned char *shm_buf;
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static unsigned shm_rpos;
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static unsigned wpos;
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static cvar_t *snd_bits;
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static cvar_t *snd_rate;
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static cvar_t *snd_stereo;
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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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while (shm_rpos + len > shm_buflen) {
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memcpy (stream, shm_buf + shm_rpos, shm_buflen - shm_rpos);
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stream += shm_buflen - shm_rpos;
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len -= shm_buflen - shm_rpos;
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shm_rpos = 0;
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}
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if (len) {
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memcpy (stream, shm_buf + shm_rpos, len);
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shm_rpos += len;
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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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snd_stereo = Cvar_Get ("snd_stereo", "1", CVAR_ROM, NULL,
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"sound stereo output");
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snd_rate = Cvar_Get ("snd_rate", "0", CVAR_ROM, NULL,
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"sound playback rate. 0 is system default");
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snd_bits = Cvar_Get ("snd_bits", "0", CVAR_ROM, NULL,
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"sound sample depth. 0 is system default");
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}
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static volatile dma_t *
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SNDDMA_Init (void)
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{
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SDL_AudioSpec desired, obtained;
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if (snd_inited)
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return &sn;
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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 = 22050;
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if (snd_rate->int_val)
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desired.freq = snd_rate->int_val;
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switch (snd_bits->int_val) {
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case 8:
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desired.format = AUDIO_U8;
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break;
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case 0: // default is 16 bits per sample
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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",
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snd_bits->int_val);
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return 0;
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}
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desired.channels = snd_stereo->int_val ? 2 : 1;
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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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/* Fill the audio DMA information block */
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sn.samplebits = (obtained.format & 0xFF);
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sn.speed = obtained.freq;
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sn.channels = obtained.channels;
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sn.frames = obtained.samples * 8; // 8 chunks in the buffer
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sn.framepos = 0;
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sn.submission_chunk = 1;
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shm_buflen = sn.frames * sn.channels * (sn.samplebits / 8);
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sn.buffer = calloc (shm_buflen, 1);
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if (!sn.buffer)
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Sys_Error ("Failed to allocate buffer for sound!");
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shm_buf = calloc (shm_buflen, 1);
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if (!shm_buf)
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Sys_Error ("Failed to allocate buffer for sound!");
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shm_rpos = wpos = 0;
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if (!snd_blocked)
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SDL_PauseAudio (0);
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snd_inited = 1;
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return &sn;
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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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if (!snd_inited)
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return 0;
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SDL_LockAudio ();
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sn.framepos = shm_rpos / (sn.channels * (sn.samplebits / 8));
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SDL_UnlockAudio ();
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return sn.framepos;
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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_CloseAudio ();
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free (sn.buffer);
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free (shm_buf);
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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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static void
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SNDDMA_Submit (void)
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{
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static unsigned old_paintedtime;
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unsigned len;
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if (!snd_inited || snd_blocked)
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return;
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SDL_LockAudio ();
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if (*plugin_info_snd_output_data.paintedtime < old_paintedtime)
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old_paintedtime = 0;
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len = (*plugin_info_snd_output_data.paintedtime - old_paintedtime) *
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sn.channels * (sn.samplebits / 8);
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old_paintedtime = *plugin_info_snd_output_data.paintedtime;
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while (wpos + len > shm_buflen) {
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memcpy (shm_buf + wpos, sn.buffer + wpos, shm_buflen - wpos);
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len -= shm_buflen - wpos;
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wpos = 0;
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}
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if (len) {
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memcpy (shm_buf + wpos, sn.buffer + wpos, len);
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wpos += len;
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}
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SDL_UnlockAudio ();
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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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if (!snd_inited)
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return;
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if (++snd_blocked == 1)
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SDL_PauseAudio (1);
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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_inited || !snd_blocked)
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return;
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if (!--snd_blocked)
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SDL_PauseAudio (0);
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}
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PLUGIN_INFO(snd_output, sdl)
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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) 1999,2000,2001,2012 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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