[mythtv-commits] Ticket #8408: 24-bit audio support

MythTV mythtv at cvs.mythtv.org
Sun May 2 01:52:04 UTC 2010

#8408: 24-bit audio support
 Reporter:  anonymous              |       Owner:  jyavenard  
     Type:  enhancement            |      Status:  new        
 Priority:  minor                  |   Milestone:  unknown    
Component:  MythTV - Audio Output  |     Version:  Unspecified
 Severity:  medium                 |     Mlocked:  0          
 Here's a patch for 32-bit audio support on NVIDIA Geforce 8300 mGPU and
 GT2XX cards. The patch needs more work to play nicely with other  audio
 configurations. In particular, encoding to Dolby Digital is desirable when
 32-bit audio isn't available.

 ALSA 1.0.23 must be installed for the GT2XX to work. On the NVIDIA GeForce
 8300 mGPU, the channel order is in SMPTE not ALSA so a remap is needed. On
 Mythbuntu 9.10, the PCM buffer defaults to 64KB which isn't enough for
 reliable audio playback. To get a buffer of 400 ms, I suggest:

 echo 512 > /proc/asound/card1/pcm7p/sub0/prealloc

Ticket URL: <http://svn.mythtv.org/trac/ticket/8408>
MythTV <http://www.mythtv.org/>

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