On Fri, 23 Apr 2004, Erik Inge Bolsų wrote:
>See subject. Has anyone got this working? I've followed the examples and
>got a few different filters working (chorus, delay), but am having trouble
>with more complex ones - and suspect a bug in alsa-lib.
>
>Current ALSA CVS version, as of a few hours ago.
>
>The plugin in question is from swh-plugins-0.4.3.tar.gz. Had the same
>problem with a plugin from ladspa's cmt_src_1.15.tgz
>
>The .asoundrc below
>
>pcm._novoice {
> type ladspa
> slave.pcm "plughw:0,0";
> path "/usr/local/lib/ladspa";
> playback_plugins [
> {
> label karaoke
> policy none
> input {
> controls
> {
> "Vocal volume (dB)" -30
> }
> bindings
> {
> 0 "Left in"
> 1 "Right in"
> }
> }
> output {
> bindings
> {
> 0 "Left out"
> 1 "Right out"
> }
> }
> }
> ]
>}
>
>pcm.novoice {
> type plug
> slave.pcm "_novoice";
>}
>
>gives me
>
>[EMAIL PROTECTED]:~$ aplay -Dnovoice PCM1.wav
>Playing WAVE 'PCM1.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo
>ALSA lib pcm_ladspa.c:439:(snd_pcm_ladspa_allocate_instances) Unable to
>connect input port of plugin 'Karaoke' channel 1 depth 0
>aplay: set_params:880: Unable to install hw params:
>ACCESS: RW_INTERLEAVED
>FORMAT: S16_LE
>SUBFORMAT: STD
>SAMPLE_BITS: 16
>FRAME_BITS: 32
>CHANNELS: 2
>RATE: 44100
>PERIOD_TIME: (74285 74286)
>PERIOD_SIZE: 3276
>PERIOD_BYTES: 13104
>PERIODS: (2 3)
>BUFFER_TIME: (148594 148595)
>BUFFER_SIZE: 6553
>BUFFER_BYTES: 26212
>TICK_TIME: 10000
>
>
>I've tried tracing it in gdb, but gdb keeps playing tricks on me - so no
>luck yet.
>
>At one point, in snd_pcm_ladspa_connect_plugin, I saw
>the parameters "plugin" and "io" resolve to the same address, but haven't
>been able to reproduce yet. plugin->input looked correct, though.
Red herring. printf's show that this was gdb playing tricks.
I get this, though.
snd_pcm_ladspa_connect_plugin: io->port_bindings_size: 2
snd_pcm_ladspa_connect: instance->channel = 0, channel = 0
snd_pcm_ladspa_connect_plugin: io->port_bindings_size: 2
snd_pcm_ladspa_connect: instance->channel = 0, channel = 1
ALSA lib pcm_ladspa.c:455:(snd_pcm_ladspa_allocate_instances) Unable to
connect input port of plugin 'Karaoke' channel 1 depth 0
aplay: set_params:880: Unable to install hw params:
Hmmm. On second reading, it seems alsa-lib only handles mono-input and
mono-output ladspa plugins, even though the config parser is smart enough
to understand the concept of multichannel plugins. Damn.
--
Erik I. Bolsų | email: <knan at mo.himolde.no>
The UNIX philosophy basically involves giving you enough rope to
hang yourself. And then a couple of feet more, just to be sure.
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