[Ffmpeg-devel] [RFC] IMC decoder

[Benjamin Larsson]

Kostya skrev:
> On Mon, Oct 30, 2006 at 10:39:24AM +0100, Benjamin Larsson wrote:
>   
>> [...]
>> First thanks for cleaning up my code. And here are some comments.
>>     
>
> I learned a bit more of lavc doing this so thanks for opportunity ;)
>   

Wanna learn some more ? The DTS decoder is not yet completly ported :)

> [...]
>   
>> This looks alot like the ffmpeg imdct function with the exception of the 
>> postrotation, window and reorder part. The thing that can be tried is to 
>> like the do_imdct_512 function in the soc ac3 decoder. If that doesn't 
>> work then the transforms aren't identical and the code can't be replaced.
>>     
>
> Well, two issues stopped me:
> a) different prerotating coefficients (and signs)
> b) windowing and output also involve last_fft_im (with updating) and
> untangling it is not trivial to me
>
> Anyway, feel free to convert it to imdct. I just not dare to do this.

I think it's another MLT based transform if the rotation coefficients 
differ. It looks like they rolled their own MLT transform like cook.

MvH
Benjamin Larsson