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audio/wavdec: add -s option

--- a/sys/man/1/audio

+++ b/sys/man/1/audio

@@ -23,6 +23,10 @@

 ]

 .br

 .B audio/wavdec

+[

+.B -s

+.I seconds

+]

 .br

 .B audio/sundec

 .PP

--- a/sys/src/cmd/audio/wavdec/wavdec.c

+++ b/sys/src/cmd/audio/wavdec/wavdec.c

@@ -40,13 +40,29 @@

 }

 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();

@@ -95,6 +111,11 @@

 		break;

 	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);