93 lines
1.3 KiB
C
93 lines
1.3 KiB
C
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/*
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* sdl-audio.c
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* sdl audio interface
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*
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* (C) 2001 Laguna
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*
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* Licensed under the GPLv2, or later.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <SDL/SDL.h>
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#include "rc.h"
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#include "pcm.h"
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struct pcm pcm;
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static int sound = 1;
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static int samplerate = 44100;
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static int stereo = 1;
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static volatile int audio_done;
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rcvar_t pcm_exports[] =
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{
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RCV_BOOL("sound", &sound),
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RCV_INT("stereo", &stereo),
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RCV_INT("samplerate", &samplerate),
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RCV_END
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};
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static void audio_callback(void *blah, byte *stream, int len)
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{
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memcpy(stream, pcm.buf, len);
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audio_done = 1;
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}
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void pcm_init()
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{
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int i;
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SDL_AudioSpec as;
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if (!sound) return;
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SDL_InitSubSystem(SDL_INIT_AUDIO);
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as.freq = samplerate;
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as.format = AUDIO_U8;
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as.channels = 1 + stereo;
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as.samples = samplerate / 60;
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for (i = 1; i < as.samples; i<<=1);
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as.samples = i;
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as.callback = audio_callback;
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as.userdata = 0;
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if (SDL_OpenAudio(&as, 0) == -1)
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return;
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pcm.hz = as.freq;
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pcm.stereo = as.channels - 1;
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pcm.len = as.size;
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pcm.buf = malloc(pcm.len);
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pcm.pos = 0;
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memset(pcm.buf, 0, pcm.len);
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SDL_PauseAudio(0);
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}
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int pcm_submit()
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{
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if (!pcm.buf) return 0;
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if (pcm.pos < pcm.len) return 1;
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while (!audio_done)
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SDL_Delay(4);
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audio_done = 0;
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pcm.pos = 0;
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return 1;
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}
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void pcm_close()
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{
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if (sound) SDL_CloseAudio();
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}
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