[src/trunk]: src/sys/arch/arm/iomd The VIDC20 data sheet doesn't define the p...

[bjh21 <bjh21%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/cd1e03f15382
branches:  trunk
changeset: 557506:cd1e03f15382
user:      bjh21 <bjh21%NetBSD.org@localhost>
date:      Sat Jan 10 22:33:24 2004 +0000

description:
The VIDC20 data sheet doesn't define the polarity of the sign bit for
8-bit VIDC audio.  Both Richard Earnshaw and I had guessed that a set
bit was positive (the same as normal mu-law), but the AudioWorks
manual, and Sound_SoundLog on RISC OS, seem to disagree.  Change
MULAW_TO_VIDC to match Sound_SoundLog, since the latter is probably
definitive.

diffstat:

 sys/arch/arm/iomd/vidcaudio.c |  6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diffs (27 lines):

diff -r cca6ec6f49db -r cd1e03f15382 sys/arch/arm/iomd/vidcaudio.c
--- a/sys/arch/arm/iomd/vidcaudio.c     Sat Jan 10 21:38:32 2004 +0000
+++ b/sys/arch/arm/iomd/vidcaudio.c     Sat Jan 10 22:33:24 2004 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: vidcaudio.c,v 1.32 2004/01/03 14:53:16 chris Exp $     */
+/*     $NetBSD: vidcaudio.c,v 1.33 2004/01/10 22:33:24 bjh21 Exp $     */
 
 /*
  * Copyright (c) 1995 Melvin Tang-Richardson
@@ -65,7 +65,7 @@
 
 #include <sys/param.h> /* proc.h */
 
-__KERNEL_RCSID(0, "$NetBSD: vidcaudio.c,v 1.32 2004/01/03 14:53:16 chris Exp $");
+__KERNEL_RCSID(0, "$NetBSD: vidcaudio.c,v 1.33 2004/01/10 22:33:24 bjh21 Exp $");
 
 #include <sys/audioio.h>
 #include <sys/conf.h>   /* autoconfig functions */
@@ -312,7 +312,7 @@
        return 0;
 }
 
-#define MULAW_TO_VIDC(m) (~(m) << 1 | (m) >> 7)
+#define MULAW_TO_VIDC(m) (~((m) << 1 | (m) >> 7))
 
 static void
 mulaw_to_vidc(void *v, u_char *p, int cc)