[PATCH] Full duplex dmix,dsnoop

[PATCH] Full duplex dmix,dsnoop

[James Courtier-Dutton]

[-- Attachment #1: Type: text/plain, Size: 863 bytes --]

See attached patch for suggested new pcm device.

It works for: -
arecord -fdat -Dplug:duplex | aplay -Dplug:duplex

bash-2.05b# arecord -fdat -Dplug:duplex | aplay -Dplug:duplex
Recording WAVE 'stdout' : Signed 16 bit Little Endian, Rate 48000 Hz, Stereo
Playing WAVE 'stdin' : Signed 16 bit Little Endian, Rate 48000 Hz, Stereo

but fails for: -
arecord -fcd -Dplug:duplex | aplay -Dplug:duplex

bash-2.05b# arecord -fcd -Dplug:duplex | aplay -Dplug:duplex
Recording WAVE 'stdout' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo
Playing WAVE 'stdin' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo
arecord: pcm.c:5920: snd_pcm_mmap_commit: Assertion `frames <= 
snd_pcm_mmap_avail(pcm)' failed.
Aborted by signal Aborted...

This last example with -fcd, outputs one period, maybe two then exits 
with the above error.

Can anybody help?

Cheers
James

[-- Attachment #2: duplex.dmix.dsnoop.patch --]
[-- Type: text/x-patch, Size: 263 bytes --]

--- alsa.conf.org	2004-02-04 12:28:31.000000000 +0000
+++ alsa.conf	2004-03-25 19:27:34.207640104 +0000
@@ -228,6 +228,12 @@
 	}
 }
 
+pcm.duplex {
+	type asym
+		playback.pcm "dmix"
+		capture.pcm "dsnoop"
+}
+
 pcm.shm {
 	@args [ SOCKET PCM ]
 	@args.SOCKET {

Re: [PATCH] Full duplex dmix,dsnoop

[Jaroslav Kysela]

On Thu, 25 Mar 2004, James Courtier-Dutton wrote:

> bash-2.05b# arecord -fcd -Dplug:duplex | aplay -Dplug:duplex
> Recording WAVE 'stdout' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo
> Playing WAVE 'stdin' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo
> arecord: pcm.c:5920: snd_pcm_mmap_commit: Assertion `frames <= 
> snd_pcm_mmap_avail(pcm)' failed.
> Aborted by signal Aborted...
> 
> This last example with -fcd, outputs one period, maybe two then exits 
> with the above error.

Do you use latest CVS code? I've fixed this problem with the rate 
(resampling) plugin.

						Jaroslav

-----
Jaroslav Kysela <perex@suse.cz>
Linux Kernel Sound Maintainer
ALSA Project, SuSE Labs


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Re: [PATCH] Full duplex dmix,dsnoop

[James Courtier-Dutton]

Jaroslav Kysela wrote:
> On Thu, 25 Mar 2004, James Courtier-Dutton wrote:
> 
> 
>>bash-2.05b# arecord -fcd -Dplug:duplex | aplay -Dplug:duplex
>>Recording WAVE 'stdout' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo
>>Playing WAVE 'stdin' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo
>>arecord: pcm.c:5920: snd_pcm_mmap_commit: Assertion `frames <= 
>>snd_pcm_mmap_avail(pcm)' failed.
>>Aborted by signal Aborted...
>>
>>This last example with -fcd, outputs one period, maybe two then exits 
>>with the above error.
> 
> 
> Do you use latest CVS code? I've fixed this problem with the rate 
> (resampling) plugin.
> 
> 						Jaroslav
> 

I think so, cat /usr/include/alsa/version.h



/*
  *  version.h
  */

#define SND_LIB_MAJOR           1 /**< major number of library version */
#define SND_LIB_MINOR           0 /**< minor number of library version */
#define SND_LIB_SUBMINOR        3 /**< subminor number of library version */
#define SND_LIB_EXTRAVER        1000000 /**< extra version number, used 
mainly for betas */
/** library version */
#define SND_LIB_VERSION         ((SND_LIB_MAJOR<<16)|\
                                  (SND_LIB_MINOR<<8)|\
                                   SND_LIB_SUBMINOR)
/** library version (string) */
#define SND_LIB_VERSION_STR     "1.0.3b"


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