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
