[alsa-devel] ctl_elems hooks with dmix plugin
Hi I was trying to use ctl_elems hooks with dmix plugin but figured that this combination doesn't work. Is there any workaround for this. I am trying the following. There are two softvol devices s0 and s1 going through dmix plugins. I wan't to mute s0 when any app opens s1 and unmute s0 when s1 is closed. I am using the below asoundrc file which results in "No card for this PCM" . Any workarounds or any minor change in libasound which will make this work? Thanks George
asoundrc:
pcm.softvol0 { type softvol slave { pcm "dmix:1" } control { name "SoftControl0" card 1 } } pcm.softvol1 { type softvol slave { pcm "dmix:1" } control { name "SoftControl1" card 1 } }
pcm.s0 { type plug slave.pcm "softvol0" }
pcm.s1 { type plug slave.pcm "softvol1" }
pcm.s1hook { type hooks # PCM with hooks slave.pcm "s1" hooks.0 { type ctl_elems hook_args [ { name "SoftControl0" preserve true lock true optional true value [ 0 ] } { name "SoftControl1" preserve true lock true optional true value [ 100 ] } ] } }
At Wed, 23 Sep 2009 00:55:54 +0530, George Kuriakose wrote:
Hi I was trying to use ctl_elems hooks with dmix plugin but figured that this combination doesn't work. Is there any workaround for this. I am trying the following. There are two softvol devices s0 and s1 going through dmix plugins. I wan't to mute s0 when any app opens s1 and unmute s0 when s1 is closed. I am using the below asoundrc file which results in "No card for this PCM" . Any workarounds or any minor change in libasound which will make this work?
Currently hook plugin doesn't work with dmix/dsnoop. The problem is that it doesn't inherit the result of snd_pcm_info() from the slave PCM. It'd be not too difficult to make it working, though, I guess.
Takashi
At Thu, 24 Sep 2009 10:05:57 +0200, I wrote:
At Wed, 23 Sep 2009 00:55:54 +0530, George Kuriakose wrote:
Hi I was trying to use ctl_elems hooks with dmix plugin but figured that this combination doesn't work. Is there any workaround for this. I am trying the following. There are two softvol devices s0 and s1 going through dmix plugins. I wan't to mute s0 when any app opens s1 and unmute s0 when s1 is closed. I am using the below asoundrc file which results in "No card for this PCM" . Any workarounds or any minor change in libasound which will make this work?
Currently hook plugin doesn't work with dmix/dsnoop. The problem is that it doesn't inherit the result of snd_pcm_info() from the slave PCM. It'd be not too difficult to make it working, though, I guess.
Could you try the patch below?
Takashi
--- diff --git a/src/pcm/pcm_direct.c b/src/pcm/pcm_direct.c index 82cc126..d9e596e 100644 --- a/src/pcm/pcm_direct.c +++ b/src/pcm/pcm_direct.c @@ -591,7 +591,10 @@ int snd_pcm_direct_poll_revents(snd_pcm_t *pcm, struct pollfd *pfds, unsigned in
int snd_pcm_direct_info(snd_pcm_t *pcm, snd_pcm_info_t * info) { - // snd_pcm_direct_t *dmix = pcm->private_data; + snd_pcm_direct_t *dmix = pcm->private_data; + + if (dmix->spcm && !dmix->shmptr->use_server) + return snd_pcm_info(dmix->spcm, info);
memset(info, 0, sizeof(*info)); info->stream = pcm->stream;
participants (2)
-
George Kuriakose -
Takashi Iwai