/* 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 $Id$ */ #ifdef HAVE_CONFIG_H # include "config.h" #endif #include #include #include "QF/cmd.h" #include "QF/console.h" #include "QF/qargs.h" #include "sound.h" static dma_t the_shm; static int snd_inited; extern int desired_speed; extern int desired_bits; static void paint_audio (void *unused, Uint8 * stream, int len) { if (shm) { shm->buffer = stream; shm->samplepos += len / (shm->samplebits / 8); // Check for samplepos overflow? S_PaintChannels (shm->samplepos); } } qboolean SNDDMA_Init (void) { SDL_AudioSpec desired, obtained; snd_inited = 0; /* Set up the desired format */ desired.freq = desired_speed; switch (desired_bits) { case 8: desired.format = AUDIO_U8; break; case 16: if (SDL_BYTEORDER == SDL_BIG_ENDIAN) desired.format = AUDIO_S16MSB; else desired.format = AUDIO_S16LSB; break; default: Con_Printf ("Unknown number of audio bits: %d\n", desired_bits); return 0; } desired.channels = 2; desired.samples = 512; desired.callback = paint_audio; /* Open the audio device */ if (SDL_OpenAudio (&desired, &obtained) < 0) { Con_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) { Con_Printf ("Couldn't open SDL audio: %s\n", SDL_GetError ()); return 0; } memcpy (&obtained, &desired, sizeof (desired)); break; } SDL_PauseAudio (0); /* Fill the audio DMA information block */ shm = &the_shm; shm->splitbuffer = 0; shm->samplebits = (obtained.format & 0xFF); shm->speed = obtained.freq; shm->channels = obtained.channels; shm->samples = obtained.samples * shm->channels; shm->samplepos = 0; shm->submission_chunk = 1; shm->buffer = NULL; snd_inited = 1; return 1; } int SNDDMA_GetDMAPos (void) { return shm->samplepos; } void SNDDMA_Shutdown (void) { if (snd_inited) { SDL_CloseAudio (); snd_inited = 0; } } /* SNDDMA_Submit Send sound to device if buffer isn't really the dma buffer */ void SNDDMA_Submit (void) { }