If anyone is interested in the solution to this problem:
it looks like when both pulse and alsa are installed thed .asoundrc is
loaded twice: once by the pulse configs and once by the alsa config.
commenting out
# "/etc/asound.conf"
# "~/.asoundrc"
in /usr/share/alsa/alsa.conf
fixed the problem.
- bram
On Thu, Jun 13, 2013 at 4:59 PM, Bram de Jong <bram.dejong@xxxxxxxxx> wrote:
> As a follow-up on this I wanted to make sure that the plugins really
> work (i.e. work properly on the raspberry) and it does seem so:
>
> $ applyplugin piano2.wav piano2_out.wav amp.so amp_stereo 6
> Peak output: 117816
> $ applyplugin piano2.wav piano2_out.wav amp.so amp_stereo 12
> Peak output: 235632
>
> It does seem that the plugin is correctly applying a gain increase
>
> - bram
>
> On Thu, Jun 13, 2013 at 4:42 PM, Bram de Jong <bram.dejong@xxxxxxxxx> wrote:
>> Hello all,
>>
>>
>> (first mail on this list, I'm new here!)
>>
>> I'm trying to do some funky things with ALSA/PulseAudio/Bluetooth on a
>> raspberry PI, and I already have many things working. However, I would
>> really like to use some LADSPA plugins as pcm devices/plugs in alsa.
>>
>> Following the many guides online my .asoundrc looks like this (using
>> the simpelest of plugins available):
>>
>> pcm.Amp {
>> type ladspa
>> slave.pcm "plughw:0,0";
>> path "/usr/lib/ladspa";
>> plugins [
>> {
>> id 1049
>> label amp_stereo
>> input {
>> controls [ 6 ]
>> }
>> }
>> ]
>> }
>>
>> However, no matter what I try (changing the slave, the config, ...), I
>> always seem to get:
>>
>> pi@raspberrypi ~ $ aplay -Dplug:Amp piano2.wav
>> ALSA lib pcm.c:2217:(snd_pcm_open_noupdate) Unknown PCM Amp
>> aplay: main:682: audio open error: File exists
>>
>> The plugin definitely exists:
>>
>> pi@raspberrypi ~ $ analyseplugin amp
>> <snip>
>> Plugin Name: "Stereo Amplifier"
>> Plugin Label: "amp_stereo"
>> Plugin Unique ID: 1049
>> Maker: "Richard Furse (LADSPA example plugins)"
>> <snip>
>>
>> So that isn't the problem.
>>
>> If anyone has any hint to tell me where to start looking that would be
>> superb. I find nothing in the logs, -vv doesn't help either, ... so I
>> don't really see what I'm doing wrong.
>>
>> One thing that did work (using pulseaudio) was to load the plugin
>> directly as a PA module, but I want to be able to control the controls
>> of my plugin in realtime (something which doesn't seem possible until
>> a much later version of PA):
>>
>> ( pactl load-module module-ladspa-sink sink_name=ladspa_amp
>> master=alsa_output.platform-bcm2835_AUD0.0.analog-stereo plugin=amp
>> label=amp_stereo control=6 )
>>
>>
>> kindest and any help much appreciated!
>>
>>
>> - bram
>>
>> --
>> http://www.samplesumo.com
>> http://www.freesound.org
>> http://www.smartelectronix.com
>> http://www.musicdsp.org
>>
>> office: +32 (0) 9 335 59 25
>> mobile: +32 (0) 484 154 730
>
>
>
> --
> http://www.samplesumo.com
> http://www.freesound.org
> http://www.smartelectronix.com
> http://www.musicdsp.org
>
> office: +32 (0) 9 335 59 25
> mobile: +32 (0) 484 154 730
--
http://www.samplesumo.com
http://www.freesound.org
http://www.smartelectronix.com
http://www.musicdsp.org
office: +32 (0) 9 335 59 25
mobile: +32 (0) 484 154 730
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