[FFmpeg-devel] libavcodec/psd : add support for rgb/gray float

[Dzung Hoang]

I implemented a 32-bit float GBRAP/GBRP pixel format and used it in vf_zscale.c and vf_overlay.c. I also implemented an EXR encoder using miniexr that uses the new float pixel format. I can contribute this if there is interest.
I used the above mods to do HDR video processing that includes overlaying HDR and SDR video. IMHO, for ffmpeg to handle HDR video well, float and half-float are needed and also metadata to signal the color space and transfer function for each picture. It's a big job that can touch a lot of code, which is why I kept my changes private and limited to only what I need.


      From: Martin Vignali <martin.vignali at gmail.com>
 To: FFmpeg development discussions and patches <ffmpeg-devel at ffmpeg.org> 
 Sent: Tuesday, March 7, 2017 4:16 PM
 Subject: Re: [FFmpeg-devel] libavcodec/psd : add support for rgb/gray float
   
Hello

@Carl :
I make some tests in order to avoid temp buffer, but i have some strange
result, when i not use a temp buffer.


> Time to think about a float pixfmt? I find it weird that we support
> excessively obscure pixfmts like AV_PIX_FMT_BGR4_BYTE, but then have
> hacks like this one if the codec uses float data.
>
> (I'm just commenting, not arguing for/against your actual patch.)
>
I agree with your comment.
Float pixfmt is a more clean way.
it can also be useful for image processing with filters, and encoding float
data.

Any tips to add support for float pixfmts ?
I try to take a look to the source code, but it's not very easy to
understand.

Martin
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