From mboxrd@z Thu Jan 1 00:00:00 1970 From: bugtrack@alsa-project.org Subject: [ALSA - driver 0001928]: Only Problems with Surround Sound Date: Wed, 15 Mar 2006 22:55:29 +0100 Message-ID: Mime-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Return-path: Received: from bugtrack.alsa-project.org (gate.perex.cz [85.132.177.35]) by alsa.jcu.cz (ALSA's E-mail Delivery System) with ESMTP id BA95C203 for ; Wed, 15 Mar 2006 22:55:29 +0100 (MET) Sender: alsa-devel-admin@lists.sourceforge.net Errors-To: alsa-devel-admin@lists.sourceforge.net List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , List-Archive: To: alsa-devel@alsa-project.org List-Id: alsa-devel@alsa-project.org A NOTE has been added to this issue. ====================================================================== ====================================================================== Reported By: the-me Assigned To: tiwai ====================================================================== Project: ALSA - driver Issue ID: 1928 Category: PCI - cmipci Reproducibility: always Severity: major Priority: normal Status: assigned Distribution: Debian Sid Kernel Version: 2.6.15.6 ====================================================================== Date Submitted: 03-15-2006 22:02 CET Last Modified: 03-15-2006 22:55 CET ====================================================================== Summary: Only Problems with Surround Sound Description: Hi. I've got a big problem ( like many other users of many other soundcards ). My Surroundsound didn't work! I've got the Terratec Aureon 5.1 Fun soundcard. At alsamixer, I haven't got any LFE or Center Options ( why? there stands in the topic *MC6 ( for 6 channels! ) ). Now I tried it with a .asoundrc. Result: Now my Rear / Front / Center worked correctly at listening to mp3s, the subwoofer ( lfe ) gives also high sound out, not only deep!!! thats a big problem. I tried it with the following .asoundrc => http://www.linux-development.org/nopaste/?800 now I found an entry at an wiki of alsa.opensrc.org , which contains following: --------------- Custom Routing of Signals to Surround Outputs With a little .asoundrc hackery, you can easily route signals around any way you like. See for example FAQ028 for an example of how to play a stereo signal over booth front and rear speakers simultaneously. The example can easily be adapted to suit your needs. FAQ028 tells us how to route our "normal" stereo signals to 4 or 5 speakers. It would be nice to process the signal for the subwoofer with a lowpass filter. Thats's where the LADSPA plugins come in handy: pcm.lowpass { type ladspa slave.pcm ... path "/usr/lib/ladspa" plugins [ { label lpf input { controls [ 50 ] } } ] } This filter will cut off everything above 50 Hz. Only problem: How do I send only one channel (a mixture of right and left channel) through this filter? And where do I send the filtered signal? I have tried this setup: # move channel 0 to channel 2 pcm.move0to2 { type route slave.pcm 3to6 slave.channels 3 ttable.0.2 1 } # 3to6 has 3 input and 6 output channels # the stereo signal is on ch. 0 and 1 # ch.0 is copied to 0 and 2 (front and rear) # ch.1 is copied to 1 and 3 (front and rear) # ch.0 and ch.1 will is mixed to ch.4 (center) # ch.2 is routed to ch.5 (subwoofer) pcm.3to6 { type route slave.pcm "surround51" slave.channels 6 ttable.0.0 1 ttable.1.1 1 ttable.0.2 1 ttable.1.3 1 ttable.0.4 0.5 ttable.1.4 0.5 ttable.2.5 1 } This seems to work from the lowpass filter to the output (I have tried aplay -D plug:lowpass sound.wav). But still the question - How to I get the data of one channel to the lowpass filter? --------------- my question, how can I set up this lowpassfilter only for my LFE channel?? I need it! mfg Patrick ====================================================================== ---------------------------------------------------------------------- rlrevell - 03-15-06 22:24 ---------------------------------------------------------------------- Your surround sound (playback of 5.1 audio) is working perfectly - what you want is upmixing of stereo sounds to 5.1. This is not really appropriate for a bug report as it's not a bug. Please post your question to the alsa-user list. ---------------------------------------------------------------------- the-me - 03-15-06 22:55 ---------------------------------------------------------------------- hmm, you can see this like a feature request. an alsa option to enable this in alsamixer will be good. but do you have any idea? Issue History Date Modified Username Field Change ====================================================================== 03-15-06 22:02 the-me New Issue 03-15-06 22:02 the-me Distribution => Debian Sid 03-15-06 22:02 the-me Kernel Version => 2.6.15.6 03-15-06 22:24 rlrevell Note Added: 0008575 03-15-06 22:55 the-me Note Added: 0008576 ====================================================================== ------------------------------------------------------- This SF.Net email is sponsored by xPML, a groundbreaking scripting language that extends applications into web and mobile media. Attend the live webcast and join the prime developer group breaking into this new coding territory! http://sel.as-us.falkag.net/sel?cmd=lnk&kid=110944&bid=241720&dat=121642