[vlc-devel] [PATCH 1/2] First release of blt module

[Francesco, Cuzzocrea]

Sorry but I'm new to submitting a patch (this is the first I done...). 
Please can you explain what

did you mean with "separate demux and codec" ?  I made two separate 
files. Did you mean

to make two different patches (one for introducing demux and one for 
introducing codec) ?

I wrote the codec (that use the libavcodec too ) because one of our most 
used blt format foresee

two separate  codestreams,  one for luma and one for the two components 
of chroma, so not always

we have merged components.

That is, when I speak of merged components I intend a codestream with 
SOT and SIZ like these:

FF 4F FF 51 00 2F 00 00 00 00 07 80 00 00 02 1C 00 00 00 00 00 00 00 00 
00 00 07 80

00 00 02 1C 00 00 00 00 00 00 00 00 00 03 07 01 01 07 02 01 07 02 01

so we have three components each one of 8 bits in 4:2:2 format (first 
compo, luma,  is in ratio 1:1,

second and third compo, chroma,  is in ratio 1:2). In most cases we have 
a first codestream:

FF 4F FF 51 00 29 00 00 00 00 07 80 00 00 02 1C 00 00 00 00 00 00 00 00 
00 00 07 80

00 00 02 1C 00 00 00 00 00 00 00 00 00 01 09 01 01

for luma ( 1 component at 10 bit in 1:1 ratio) and after it a second 
codestream:

FF 4F FF 51 00 2C 00 00 00 00 07 80 00 00 02 1C 00 00 00 00 00 00 00 00 
00 00 07 80
00 00 02 1C 00 00 00 00 00 00 00 00 00 02 09 02 01 09 02 01

for chroma ( 2 components at 10 bit in 1:2 ratio). This is why I wrote 
the codec too.
Regarding chroma conversion, sorry, but I haven't figured out how to use 
the filters for
doing it.




On 04/08/2017 17.51, Rémi Denis-Courmont wrote:
> Please separate the demux and codec, otherwise it is not possible to review
> even the demuxer.
>
> And frankly, you should need neither a codec nor a chroma conversion. We
> already have a libavcodec-based JPEG.2000 decoder, and better chroma
> conversions.
>

-- 
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*    Ing. Francesco  Cuzzocrea
*    company:    BLT Italia srl        web:  http://www.blt.it
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