Johannes, I'm trying to do the same thing you are. My linux distribution (Fedora 7) doesn't include the a52 plugin by default. I had to download and build the alsa-plugins from the alsa site.
After getting the a52 plugin compiled and installed, I sorta works, however, the audio cuts in and out. I haven't been able to figure out why. See my post on 1/8/08. Jim "Johannes Bauer" <[EMAIL PROTECTED]> wrote in message news:[EMAIL PROTECTED] > Hello list, > > I'm trying to get my surround system working, especially routing the 5.1 > channels I have when there is only a stereo playback. This means that > the rear speakers and (especially) the subwoofer should output something > when I play "normal" music. > > What I've got working so far: When playing back an AC3 stream in > passthrough mode, all six channels are working like a charm. In normal > "stereo" mode, however, only the two front channels work. When I issue a > > $ speaker-test -c 6 > > I have output only on the front two speakers. So I tried to make ALSA > encode the whole stream to AC3 on-the-fly so my receiver recognizes it - > got some ideas off the net: > > pcm.Filter_A52encode { > type a52 > } > > pcm.Filter_Upmix { > type upmix > slave.pcm "Filter_A52encode" > channels 6 > } > > However, ALSA complains: > > ALSA lib pcm_direct.c:1464:(_snd_pcm_direct_get_slave_ipc_offset) > Invalid type 'a52' for slave PCM > > There does not seem to be a "a52" plugin, although the web mentions it. > What am I doing wrong? > > Please be patient with me, I promise to write a tutorial on how to do it > once I get it all done - it's already under construcion: > http://johannes-bauer.com/dolby/ > > Thanks in advance, > Greetings, > Johannes > > ------------------------------------------------------------------------- > This SF.net email is sponsored by: Microsoft > Defy all challenges. Microsoft(R) Visual Studio 2008. > http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Alsa-user mailing list Alsa-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/alsa-user
