Re: Alsa and Jackd

[Ian Leonard <ian@xxxxxxxxxxxxx>]

I found the problem. The error was in the .asoundrc file. 

The line "0 pcm:playback_1" should have been "0 system:playback_1"

On 8 August 2011 16:15, Ian Leonard <ian@xxxxxxxxxxxxx> wrote:

Hi,

I am having trouble getting alsa and jackd to work on Fedora14. I have had this working on a much older version.

I have disabled pulseaudio by removing the rpm (I hope this is enough).

My .asoundrc file looks like this:

# use this as default

pcm.!default {

type plug

slave { pcm "jack" }

}

pcm.jack {

type jack

playback_ports {

0 alsa_pcm:playback_1

1 alsa_pcm:playback_2

}

capture_ports {

0 alsa_pcm:capture_1

1 alsa_pcm:capture_2

}

}

I run jackd and get this:

jackdmp 1.9.5

Copyright 2001-2005 Paul Davis and others.

Copyright 2004-2009 Grame.

jackdmp comes with ABSOLUTELY NO WARRANTY

This is free software, and you are welcome to redistribute it

under certain conditions; see the file COPYING for details

no message buffer overruns

no message buffer overruns

JACK server starting in realtime mode with priority 20

audio_reservation_init

Acquire audio card Audio0

creating alsa driver ... hw:0|hw:0|1024|2|48000|0|0|nomon|swmeter|-|32bit

Using ALSA driver HDA-Intel running on card 0 - HDA Intel at 0xe0280000 irq 46

configuring for 48000Hz, period = 1024 frames (21.3 ms), buffer = 2 periods

ALSA: final selected sample format for capture: 32bit integer little-endian

ALSA: use 2 periods for capture

ALSA: final selected sample format for playback: 32bit integer little-endian

ALSA: use 2 periods for playback

Using port names patch v0.1 (07.04.2010)

I then run aplay:

# aplay /tmp/test.wav

jack_client_new: deprecated

Playing WAVE '/tmp/test.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Mono

cannot connect alsa-jack.jackP.29854.0:out_000 to alsa_pcm:playback_1

aplay: pcm_write:1603: write error: Input/output error

while jackd gives:

Unknown destination port in attempted (dis)connection src_name [alsa-jack.jackP.29854.0:out_000] dst_name [alsa_pcm:playback_1]

Without jack, the wav file plays fine an alsamixer works. It looks like jackd doesn't know how to talk to alsa but it has read the .asoundrc file.

I have the following installed:

qjackctl-0.3.8-1.fc14.i686

jack-audio-connection-kit-1.9.5-1.fc14.i686

alsa-plugins-jack-1.0.22-1.fc13.i686

jack_capture-0.9.56-1.fc14.1.i686

Any help appreciated.

--
Ian

-- 
Ian
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