shithub: pplay

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add pcminv: invert samples

--- a/mkfile

+++ b/mkfile

@@ -18,7 +18,11 @@

 # override $MANFILES??

 TARG=\

 	pcmmix\

+	pcminv\

 	pplay\

 $O.pcmmix: pcmmix.$O

 	$LD $LDFLAGS -o $target pcmmix.$O

+

+$O.pcminv: pcminv.$O

+	$LD $LDFLAGS -o $target pcminv.$O

--- /dev/null

+++ b/pcminv.c

@@ -1,0 +1,27 @@

+#include <u.h>

+#include <libc.h>

+

+void

+main(int argc, char **argv)

+{

+	int fd;

+	long n;

+	s16int *p, *e, buf[IOUNIT / sizeof *p];

+

+	ARGBEGIN{

+	}ARGEND

+	fd = 0;

+	if(*argv != nil && (fd = open(*argv, OREAD)) < 0)

+		sysfatal("open: %r");

+	for(;;){

+		if((n = read(fd, buf, sizeof buf)) <= 0)

+			break;

+		for(p=buf,e=buf+n/sizeof(*buf); p<e; p++)

+			*p = -(*p);

+		if(write(1, buf, n) != n)

+			sysfatal("write: %r");

+	}

+	if(n < 0)

+		sysfatal("read: %r");

+	exits(nil);

+}

-- 

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