?? snd_thin.c
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#include "defs.h"#include "pcm.h"#include "rc.h"#include "thinlib.h"struct pcm pcm;static byte *backbuf;static volatile int audio_int;static int samplerate = 44100;static int sound = 1;static int stereo = 0;rcvar_t pcm_exports[] ={ RCV_BOOL("sound", &sound), RCV_INT("samplerate", &samplerate), RCV_INT("stereo", &stereo), RCV_END};/* hardware audio buffer fill */static void _audio_callback(void *buf, int len){ memcpy(buf, backbuf, len); audio_int = 1;}void pcm_init(){ thinsound_t params; if (!sound) { pcm.hz = 11025; pcm.len = 4096; pcm.buf = (byte *) malloc(pcm.len); pcm.pos = 0; pcm.stereo = stereo; return; } if (thin_init(THIN_SOUND)) { sound = 0; return; } /* don't spam the graphics screen if we don't have soundcard */ thin_setlogfunc(NULL); params.sample_rate = samplerate; params.frag_size = samplerate / 60; params.format = THIN_SOUND_8BIT; if (stereo) params.format |= THIN_SOUND_STEREO; else params.format |= THIN_SOUND_MONO; params.callback = _audio_callback; if (thin_sound_init(¶ms)) { sound = 0; return; } pcm.hz = params.sample_rate; pcm.len = params.frag_size; pcm.stereo = (params.format & THIN_SOUND_STEREO) ? 1 : 0; pcm.buf = (byte *) malloc(pcm.len); if (!pcm.buf) die("failed to allocate sound buffer\n"); memset(pcm.buf, 0, pcm.len); pcm.pos = 0; backbuf = (byte *) malloc(pcm.len); if (!backbuf) die("failed to allocate sound backbuffer\n"); memset(backbuf, 0, pcm.len); thin_sound_start();}void pcm_close(){ if (sound) { thin_sound_stop(); thin_shutdown(); } if (pcm.buf) free(pcm.buf); if (backbuf) free(backbuf); backbuf = 0; memset(&pcm, 0, sizeof pcm);}int pcm_submit(){ if (!sound) { pcm.pos = 0; return 0; } if (pcm.pos < pcm.len) return 1; while (!audio_int) ; /* spin */ memcpy(backbuf, pcm.buf, pcm.len); audio_int = 0; pcm.pos = 0; return 1;}?? 快捷鍵說明
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