I have been trying to get S16_LE format sound out of my ice1712 with
poor success, and noted the example in
http://www.alsa-project.org/alsa-doc/alsa-lib/pcm_plugins.html
for setting up slaves. I added a format line to ~/.asoundrc thus:
pcm.rate44100Hz {
type plug
slave {
pcm "hw:0,0"
rate 44100
format "Unsigned 16 bit Little Endian"
}
}
and received a failure;
ALSA lib pcm.c:5504:(snd_pcm_slave_conf) unknown format
snd_pcm_open: Invalid argument (rate44100Hz)
Investigating the code led me to conclude that the snd_pcm_format_value()
function should be looking up strings in snd_pcm_format_descriptions[]
where they are defined instead of snd_pcm_format_names[] where they are not.
It would also be helpful to print out the unknown format with the error.
Perhaps I misunderstand but there is little documentation on format.
Now I get the following error:
ALSA lib pcm_params.c:2020:(snd_pcm_hw_refine_slave) Slave PCM not useable
Any ideas?
The following patch is against yesterdays cvs.
--- /u01/alsa/alsa-cvs/alsa-lib/src/pcm/pcm.c Fri Feb 22 21:03:18 2002
+++ src/pcm/pcm.c Sun Mar 3 00:07:26 2002
@@ -1299,8 +1299,8 @@
{
snd_pcm_format_t format;
for (format = 0; format <= SND_PCM_FORMAT_LAST; format++) {
- if (snd_pcm_format_names[format] &&
- strcasecmp(name, snd_pcm_format_names[format]) == 0) {
+ if (snd_pcm_format_descriptions[format] &&
+ strcasecmp(name, snd_pcm_format_descriptions[format]) == 0) {
return format;
}
}
@@ -5501,7 +5501,7 @@
}
f = snd_pcm_format_value(str);
if (f == SND_PCM_FORMAT_UNKNOWN) {
- SNDERR("unknown format");
+ SNDERR("unknown format %s",str);
err = -EINVAL;
goto _err;
}
--
Sam Chessman [EMAIL PROTECTED]
First do what's necessary, then what's possible, finally the impossible.
_______________________________________________
Alsa-devel mailing list
[EMAIL PROTECTED]
https://lists.sourceforge.net/lists/listinfo/alsa-devel
