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AUHAL output questions
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AUHAL output questions


  • Subject: AUHAL output questions
  • From: Derk-Jan Hartman <email@hidden>
  • Date: Fri, 18 Mar 2005 17:05:47 +0100

Hello all,

Now that I finally have a multichannel device to test VLC (http://www.videolan.org/vlc) with, I figured that since our audio problems have been lingering for over 2,5 years now, I'd better fix it myself.

So I was thinking of switching from our current implementation that uses Coreaudio itself to an AUHAL approach, that is probably less error prone for us (and also would immediately fix our issues with multi mono channel devices).

Now i have been trying to get some things clear, but the information just doesn't seem available.

1: Does AUHAL support cac3 digital streams ?
2: If it does. does AUHAL take hoge and non mixing mode automatically in this case.
3: How do i find out if a device can handle cac3 digital, because if it can't, it will need to be decoded before being fed to the audio output core.
4: I heard that the AUHAL can do simple conversions. (but no more than one at a time?)
5: Channel ordering. I have read all the examples and stuff on it, but what i wanna know is this: channel layout.
for instance VLC (and it works with an edirol device, i'm told, so that has is as well i guess) seems to have. I have seen little about this documented.


L R Ls Rs C LFE
aka
kAudioChannelLayoutTag_MPEG_5_1_B
aka
kAudioChannelLayoutTag_DVD_20


where the Sonica Theather has L R C LFE Ls Rs aka kAudioChannelLayoutTag_MPEG_5_1_A aka kAudioChannelLayoutTag_ITU_3_2_1 aka kAudioChannelLayoutTag_DVD_12

What is the best way to handle conversion of this?
Can i query the AUHAL for the audiochannel layout?

and can i then use the channel ordering system to reorder the channels?

DJ

---
Videolan - VLC media player
Derk-Jan Hartman (hartman at videolan dot org)
http://www.videolan.org/vlc

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