Dear Takashi Iwai,

Thursday, January 16, 2003, 12:21:42 PM, you wrote:

>> >  if someone has VIA8233, VIA8233A, VIA8233C or VIA8235 chipset, could
>> >  you help the testing of the new driver?
>> >  the new driver code is found at
>> >
>> >         http://www.alsa-project.org/~iwai/via82xx.c
>>
>> i has VIA8235 and ALC650 codec. After installing new driver from cvs from
>> 20030113, there is following problem:
>>
>> In 5.1-channel dvd playback with xine using surround51 device,
>> i has swapped Rear and Center/lfe channels.
>> RL <-> Center, RR <-> LFE

this can be fixed just by exchanging Rear and Center/LFE jacks

>> i fixed this with following patch for via82xx.c
>>
>> 812,813c812,815
>> <       case 5: slots = (1<<0) | (2<<4) | (5<<8) | (3<<12) | (4<<16); break;
>> <       case 6: slots = (1<<0) | (2<<4) | (5<<8) | (6<<12) | (3<<16) | (4<<20); 
>break;
>> ---
>> > //    case 5: slots = (1<<0) | (2<<4) | (5<<8) | (3<<12) | (4<<16); break;
>> > //    case 6: slots = (1<<0) | (2<<4) | (5<<8) | (6<<12) | (3<<16) | (4<<20); 
>break;
>> >       case 5: slots = (1<<0) | (2<<4) | (3<<8) | (4<<12) | (5<<16); break;
>> >       case 6: slots = (1<<0) | (2<<4) | (3<<8) | (4<<12) | (5<<16) | (6<<20); 
>break;
>>
>> I'm not sure that it is alsa problem, xine' may be.

TI> hmm, it could be due to the setting of ALC650.  how is the status of
TI> "Exchange Center/LFE" mixer switch?

This switch has no effect. Strange. Usually its muted.
Now i think this is ALC650 problem.
Is there problem exist on via8235 with other codecs?

>> It will be nice to have a small prog for channel position testing in different
>> playback modes, because now i know no 5.1ch source other then video player.
>> In general multichannel playback has good quality now (with rc6 sound was
>> cracking).

Can you point me to a 5.1ch test audio file where recorded signals for single
channel in known order ?
I can easily understand where center channel is playing, but understanding where
is Sub playing much more difficult task. You need big Stardestroyer for it =)

Anton Worshevsky




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