[FFmpeg-devel] Libavcodec/exr : add support for tile

[Paul B Mahol]

On 4/4/16, Martin Vignali <martin.vignali at gmail.com> wrote:
> 2016-04-03 17:38 GMT+02:00 Paul B Mahol <onemda at gmail.com>:
>
>> On 4/3/16, Martin Vignali <martin.vignali at gmail.com> wrote:
>> > 2016-04-03 17:12 GMT+02:00 Paul B Mahol <onemda at gmail.com>:
>> >
>> >> On 4/3/16, Martin Vignali <martin.vignali at gmail.com> wrote:
>> >> > Hello,
>> >> >
>> >> > In attach a patch in order to add support for exr Tile (One Level)
>> >> >
>> >> > Some samples can be found here : https://we.tl/IC4XTrEJf4
>> >> > Theses samples can also be add to ./fate-suite/exr/
>> >> > (i will make a fate test soon).
>> >> >
>> >> > Details of the sample files :
>> >> > rgb_tile_half_raw_12x8.exr : uncompress half float file, in tile
>> >> > (only
>> >> one
>> >> > tile in the file)
>> >> > rgb_tile_float_raw_12x8.exr : uncompress float file, in tile (only
>> >> > one
>> >> tile
>> >> > in the file)
>> >> > rgb_tile_float_raw_150x130.exr : uncompress float file, in tile
>> >> > (multiple
>> >> > tile in the file)
>> >> >
>> >> > In this patch, compression in tile is not enabled. (i will make new
>> >> patchs
>> >> > for that after making more tests)
>> >> >
>> >> > I tried to keep the most code common with the scanline mode (reason
>> why,
>> >> > scanline code part have had some modifications).
>> >> > Tile data are reorganized, to be more like scanline uncompress data.
>> >> >
>> >> > Pass fate-exr tests.
>> >> >
>> >> > More information about tile in exr can be found here :
>> >> > http://www.openexr.com/TechnicalIntroduction.pdf
>> >> >
>> >> > Comments welcome.
>> >> >
>> >> > Martin
>> >> > Jokyo Images
>> >> >
>> >>
>> >> Pushed. Note that tile with PIZ compression crashes
>>
>
> In tile :
> RLE, ZIP1, ZIP16, PXR24 will work fine without modification, because they
> don't use s->xdelta (the datawindow width)
>
> PIZ, B44, B44A, use s->xdelta, so now, they will have some trouble for
> datawindow bigger than tile size in X.
>
> I will make a patch soon, for this.
>
> Can you send me your PIZ sample who make ffmpeg crash to check  (with
> wetransfer or something similar) ?

Its standard sample available in openexr-images-1.7.0/Tiles/GoldenGate.exr

available from OpenEXR site.

>
> Thanks by advance
>
> Martin
> Jokyo Images
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