At Thu, 9 Apr 2009 13:26:50 +0530, Harsha, Priya wrote: > > The issue that I am facing with creating a snd_kcontrol is that I am > not able to bind that value to a stream. Why? > Say I start the application > and set the type of that control to voice and open another instance > of that application and set the type to audio. Another instance must have a different stream, right? Then it must have a different substream number. In the scenario a la emu10k1, you'll have a control per each substream. So this won't conflict. > There might be a > clash and I might get the wrong stream type to the driver. Also, the > stream ids passed cannot also be guaranteed to reach the right > stream. The "stream id" you are referring to might be different from what I'm thinking of. Please elaborate your terminology before further questions. It's a bit hard to illustrate your use-case from your descriptions, so far... thanks, Takashi > > > >-----Original Message----- > >From: alsa-devel-bounces@xxxxxxxxxxxxxxxx [mailto:alsa-devel-bounces@xxxxxxxxxxxxxxxx] On Behalf Of Harsha, > >Priya > >Sent: Thursday, April 09, 2009 1:07 PM > >To: alsa-devel@xxxxxxxxxxxxxxxx > >Cc: Takashi Iwai; David Dillow; Lee Revell; Clemens Ladisch > >Subject: Re: question on hardware > > > >Hi , > > > >I need more help here. I tried looking at the .conf file but I have another requirement here. > > > >Let me put my requirements here. Please suggest me ways to get this done > > > >1. When I get a .prepare call in my driver, I need to know the stream type > >2. When I return from that call, I need to send to the user the locally allocated stream id > > > >This is specific to the sound card/ DSP I am developing the driver for. The application is also proprietary. Is this > >possible at all? Please suggest me ways to do the same. > > > >Thanks, > >Harsha > > > >>-----Original Message----- > >>From: David Dillow [mailto:dave@xxxxxxxxxxxxxx] > >>Sent: Tuesday, December 09, 2008 6:14 PM > >>To: Harsha, Priya > >>Cc: Clemens Ladisch; alsa-devel@xxxxxxxxxxxxxxxx; Lee Revell > >>Subject: Re: question on hardware mixing > >> > >>On Tue, 2008-12-09 at 14:25 +0530, Harsha, Priya wrote: > >>> If I define mixer controls to switch between each substream, I would > >>> not be able to handle multiple streams at time.... > >> > >>Check into the ALSA configuration file syntax -- there are number of > >>things you can do there, like define a 'voice' device that uses hooks to > >>set a control setting (snd_kcontrol) when you open a PCM. You can use > >>that control setting to let your driver know if the PCM channel is being > >>used for voice or audio traffic. > >> > >>Look at how the EMU10K1 handles surround sound audio > >>in /etc/alsa/cards/EMU10K1.conf > >> > >>I started to do some similar things for sis7019 surround sound, but > >>they've never made it out of my office due to lack of time/testing HW. > >> > >>> I had asked this in my earlier follow up email as well - can I use > >>> snd_pcm_t->private_data to communicate if it's a voice or audio > >>> I understand this private_data gets copied to substream->private data > >>> which will reach the driver... > >>> Am I right here? > >> > >>I can't answer this specifically, but I believe the answer is in the > >>name -- 'private'. This is for the ALSA system to use, you can hang your > >>own data off a substream using snd_pcm_substream_chip(). Besides, how do > >>you plan on setting it in the snd_pcm_t type? > >> > >>I think that if you set up some controls, use the config file language, > >>and have your audio apps open a 'voice' device, you can get where you > >>want. > >> > >>Dave > > > >_______________________________________________ > >Alsa-devel mailing list > >Alsa-devel@xxxxxxxxxxxxxxxx > >http://mailman.alsa-project.org/mailman/listinfo/alsa-devel > _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
