Hi all,
Today's email re bug #376525 made me look at this bug again and do
a little research on the OSS ioctls. The following patch may fix the
issue.
Previously, I just set the bitwidth to 16 bits, without specifying
the endian-ness. My suspicion is that OSS and the ALSA behave slightly
differently when I just specify 16 bits.
To fix this issue, this patch, sets 16 bits with the endian-ness of
the host CPU.
I'll be testing this on my ancient banged up ibook as soon as I
get it up and running again. If anyone else wants to play with
this, please do.
Erik
--- examples/sndfile-play.c.old
+++ examples/sndfile-play.c
@@ -406,7 +406,7 @@
static int
linux_open_dsp_device (int channels, int srate)
-{ int fd, stereo, temp, error ;
+{ int fd, stereo, fmt, error ;
if ((fd = open ("/dev/dsp", O_WRONLY, 0)) == -1 &&
(fd = open ("/dev/sound/dsp", O_WRONLY, 0)) == -1)
@@ -426,11 +426,11 @@
exit (1) ;
} ;
- temp = 16 ;
- if ((error = ioctl (fd, SOUND_PCM_WRITE_BITS, &temp)) != 0)
- { perror ("linux_open_dsp_device : bitwidth ") ;
- exit (1) ;
- } ;
+ fmt = CPU_IS_BIG_ENDIAN ? AFMT_S16_BE : AFMT_S16_LE ;
+ if (ioctl (fd, SOUND_PCM_SETFMT, &fmt))
+ { perror ("linux_open_dsp_device : set format ") ;
+ exit (1) ;
+ } ;
if ((error = ioctl (fd, SOUND_PCM_WRITE_CHANNELS, &channels)) != 0)
{ perror ("linux_open_dsp_device : channels ") ;
--
+-----------------------------------------------------------+
Erik de Castro Lopo
+-----------------------------------------------------------+
"It's not that perl programmers are idiots, it's that the
language rewards idiotic behavior in a way that no other
language or tool has ever done." -- Erik Naggum
--
+-----------------------------------------------------------+
Erik de Castro Lopo
+-----------------------------------------------------------+
"Attacks by Microsoft Chairman Bill Gates on the GNU General
Public License, under which much open source and free software is
distributed, have been driven by a fear that the GPL creates a
domain of software that Microsoft cannot privatize and control"
-- Richard Stallman
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