[FFmpeg-devel] [PATCH] activate ac3 decoder

[Justin Ruggles]

Diego Biurrun wrote:
> On Sat, Aug 04, 2007 at 09:36:05PM -0400, Justin Ruggles wrote:
>> --- configure	(revision 9911)
>> +++ configure	(working copy)
>> @@ -1594,6 +1595,9 @@
>>  
>> +# disable the native AC-3 decoder if liba52 is enabled
>> +enabled liba52 && disable ac3_decoder
> 
> Possibly we should remove liba52 support, same as we did for
> libdca/libdts.

Right now it's a bit slower.  For straight channel-for-channel decoding 
it's about 3%-per-channel slower on my machine.  With downmixing 5.1 to 
stereo it's closer to 30% slower.  I'm working on better downmixing 
though.  Basically I need to work out how to downmix before the IMDCT, 
not after.  I've got papers on the subject, but I need to delve into the 
math to implement it properly.

> The patch is fine, commit anytime.

applied.

-Justin