diff options
| -rw-r--r-- | sys/src/games/snes/dsp.c | 23 |
1 files changed, 11 insertions, 12 deletions
diff --git a/sys/src/games/snes/dsp.c b/sys/src/games/snes/dsp.c index 0351d1c01..5ccdb97e6 100644 --- a/sys/src/games/snes/dsp.c +++ b/sys/src/games/snes/dsp.c @@ -42,31 +42,30 @@ enum { enum { RELEASE, ATTACK, DECAY, SUSTAIN }; +enum { Freq = 44100 }; static s16int sbuf[2*2000], *sbufp; +static int stime; static int fd; void audioinit(void) { - int cfd; - static char c[] = "speed 32000"; - fd = open("/dev/audio", OWRITE); if(fd < 0) - return; - cfd = open("/dev/volume", OWRITE); - if(cfd >= 0) - write(cfd, c, sizeof(c)); + sysfatal("open: %r"); sbufp = sbuf; } static void audiosample(s16int *s) { - if(sbufp < sbuf + nelem(sbuf)){ - *sbufp++ = s[0]; - *sbufp++ = s[1]; - } + stime -= 1<<16; + do { + sbufp[0] = s[0]; + sbufp[1] = s[1]; + sbufp += 2; + stime += (32000<<16)/Freq; + } while(stime < 0); } int @@ -459,7 +458,7 @@ echo(int s) void dspstep(void) { - if(sbufp == nil) + if(sbufp == nil || sbufp >= sbuf+nelem(sbuf)-2) return; switch(dspstate++ & 31){ case 0: voice(0, 5); voice(1, 2); break; |