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audio/wavdec: add -s option

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This commit is contained in:
Sigrid 2020-11-02 11:46:50 +01:00
parent a4c6dc1d3d
commit f4d2067373
2 changed files with 27 additions and 2 deletions
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4
sys/man/1/audio
View file

@ -23,6 +23,10 @@ mp3dec, mp3enc, oggdec, oggenc, flacdec, sundec, wavdec, pcmconv, mixfs \- decod
]
.br
.B audio/wavdec
[
.B -s
.I seconds
]
.br
.B audio/sundec
.PP

25
sys/src/cmd/audio/wavdec/wavdec.c
View file

@ -40,13 +40,29 @@ getcc(char tag[4])
}
void
main(int, char *argv[])
usage(void)
{
fprint(2, "usage: %s [ -s SECONDS ]\n", argv0);
exits("usage");
}
void
main(int argc, char **argv)
{
char buf[1024], fmt[32];
double seekto;
ulong len, n;
Wave wav;
argv0 = argv[0];
seekto = 0.0;
ARGBEGIN{
case 's':
seekto = atof(EARGF(usage()));
break;
default:
usage();
}ARGEND
if(memcmp(getcc(buf), "RIFF", 4) != 0)
sysfatal("no riff format");
get4();
@ -96,6 +112,11 @@ main(int, char *argv[])
default:
sysfatal("wave format (0x%lux) not supported", (ulong)wav.fmt);
}
if(seekto != 0.0){
if(seek(0, (ulong)seekto*wav.rate*wav.framesz & ~wav.framesz, 1) < 1)
seekto = 0.0;
fprint(2, "time: %g\n", seekto);
}
snprint(buf, sizeof(buf), "%lud", len);
execl("/bin/audio/pcmconv", "pcmconv", "-i", fmt, "-l", buf, nil);
}