Re: [FFmpeg-devel] [PATCH] [MXF] - Add jpeg2000 subdescriptor in MXF file (V2).

["Tomas Härdin" <git@haerdin.se>]

sön 2023-12-31 klockan 14:16 +0100 skrev Tomas Härdin:
> fre 2023-12-22 klockan 09:58 +0100 skrev Cédric Le Barz:
> > 
> > Le 21/12/2023 à 12:11, Tomas Härdin a écrit :
> > > ons 2023-12-20 klockan 18:04 +0100 skrev Cédric Le Barz:
> > > > Le 19/12/2023 à 14:36, Tomas Härdin a écrit :
> > > > > > +    for ( comp = 0; comp < component_count; comp++ ) {
> > > > > > +        avio_write(pb, &sc->j2k_info.j2k_comp_desc[3*comp]
> > > > > > ,
> > > > > > 3);
> > > > > > +    }
> > > > > Looks like this could be simplified to just
> > > > > 
> > > > >     avio_write(pb, sc->j2k_info.j2k_comp_desc,
> > > > > 3*component_count);
> > > > > 
> > > > > > +    if (j2k_ncomponents != component_count) {
> > > > > > +        av_log(s, AV_LOG_ERROR, "Incoherence about
> > > > > > components
> > > > > > image
> > > > > > number.\n");
> > > > > > +    }
> > > > > I again feel this should be a hard error
> > > > > 
> > > > > > +    for (comp = 0; comp < j2k_ncomponents; comp++) {
> > > > > > +        sc->j2k_info.j2k_comp_desc[comp*j2k_ncomponents] =
> > > > > > bytestream2_get_byteu(&g);   // Bitdepth for each component
> > > > > > +        sc->j2k_info.j2k_comp_desc[comp*j2k_ncomponents+1]
> > > > > > =
> > > > > > bytestream2_get_byteu(&g); // Horizontal sampling for each
> > > > > > component
> > > > > > +        sc->j2k_info.j2k_comp_desc[comp*j2k_ncomponents+2]
> > > > > > =
> > > > > > bytestream2_get_byteu(&g); // Vertical sampling for each
> > > > > > component
> > > > > > +    }
> > > > > Could be simplified to a single avio_read()
> > > > > 
> > > > > /Tomas
> > > > > _______________________________________________
> > > > > ffmpeg-devel mailing list
> > > > > ffmpeg-devel@ffmpeg.org
> > > > > https://ffmpeg.org/mailman/listinfo/ffmpeg-devel
> > > > > 
> > > > > To unsubscribe, visit link above, or email
> > > > > ffmpeg-devel-request@ffmpeg.org with subject "unsubscribe".
> > > > Here is the new version of the patch taken into account your
> > > > remarks.
> > > Looks OK. Does this also work with RGB(A)? Seems to not be
> > > hardcoded
> > > for YUV at least. Higher bitdepths would also be nice, I've been
> > > working with lossless RGB48 J2K. Doesn't necessarily need to hold
> > > up
> > > this patch, just curious.
> > > 
> > > /Tomas
> > 
> > Any J2K bitdepth can be handled with this patch (up to 31 bits per 
> > component).
> > 
> > Concerning RGBA, The JPEG 2000 sub-descriptor can be referenced
> > either 
> > by the CDCI picture essence descriptor or the RGBA picture essence 
> > descriptor both of which are defined by SMPTE ST 377-1. In this
> > patch
> > it 
> > is only referenced by the CDCI as the RGBA essence descriptor is
> > not
> > yet 
> > implemented in FFmpeg.   Nevertheless, I think it should work too
> > with 
> > CDCI essence descriptor : if you have such data, you can try.
> 
> I have one sample at least, muxed by WidgetCo's as-02-wrap. Its
> descriptor looks like this (via mxfdump):
> 
> RGBAEssenceDescriptor
>   InstanceUID = {c3bf8d8c-6fd4-4004-83d7-3950ab56e86f}
>   SubDescriptors
>     SubDescriptor = {d2013379-ad4b-4d9e-9531-c3a6d8d59175}
>     SubDescriptor -> Strong Reference to JPEG2000PictureSubDescriptor
>       JPEG2000PictureSubDescriptor
>         InstanceUID = {d2013379-ad4b-4d9e-9531-c3a6d8d59175}
>         Rsiz = 16384
>         Xsiz = 3840
>         Ysiz = 2160
>         XOsiz = 0
>         YOsiz = 0
>         XTsiz = 3840
>         YTsiz = 2160
>         XTOsiz = 0
>         YTOsiz = 0
>         Csiz = 3
>         PictureComponentSizing
>           PictureComponentSize = Ssiz="15", XRsiz="1", YRsiz="1"
>           PictureComponentSize = Ssiz="15", XRsiz="1", YRsiz="1"
>           PictureComponentSize = Ssiz="15", XRsiz="1", YRsiz="1"
>         CodingStyleDefault = Scod="0", SGcod="ProgressionOrder="2",
> NumberOfLayers="1", MultipleComponentTransformation="1"",
> SPcod="DecompositionLevels="5", CodeblockWidth="4",
> CodeblockHeight="4", CodeblockStyle="64", Transformation="1"",
> PrecinctSize=""
>         QuantizationDefault = Sqcd="32", SPqcd="152, 160, 160, 168,
> 160, 160, 168, 160, 160, 168, 160, 160, 160, 152, 152, 160"
>         Unknown ff.e9 [060e2b34.0101.010e.04010603.0e000000] = 52 10
> 47
> 10 42 10 00 00 00 00 00 00 00 00 00 00
>         Unknown ff.e8 [060e2b34.0101.010e.04010603.0f000000] = 00 02
> 00
> 00 00 00 00 01 00 00 00 02 00 02
>   LinkedTrackID = 2
>   SampleRate = 24/1
>   ContainerDuration = 1
>   EssenceContainer = MXF-GC JPEG-2000 Picture Mappings
>   FrameLayout = 0
>   StoredWidth = 3840
>   StoredHeight = 2160
>   AspectRatio = 3840/2160
>   Gamma = [060e2b34.0401.010d.04010101.010a0000]
>   PictureEssenceCoding = [060e2b34.0401.010d.04010202.03010801]
>   Unknown 32.19 [060e2b34.0101.0109.04010201.01060100] = 06 0e 2b 34
> 04
> 01 01 0d 04 01 01 01 03 04 00 00
>   Unknown ff.fe [060e2b34.0101.010e.04010501.14000000] = 00 00 00 02
>   Unknown ff.fd [060e2b34.0101.010e.04010501.13000000] = 00 00 00 03
>   Unknown ff.fc [060e2b34.0101.010e.04010501.15000000] = 00 00 00 04
>   Unknown ff.fb [060e2b34.0101.010e.04010501.16000000] = 00 00 00 05
>   VideoLineMap
>     VideoLineMapEntry = <Unknown>
>     VideoLineMapEntry = <Unknown>
>   Unknown ff.fa [060e2b34.0101.010e.04200401.01010000] = 7d 00 40 74
> 3a
> 98 75 30 1d 4c 0b b8
>   Unknown ff.f9 [060e2b34.0101.010e.04200401.01020000] = 3d 13 40 42
>   Unknown ff.f8 [060e2b34.0101.010e.04200401.01030000] = 00 98 96 80
>   Unknown ff.f7 [060e2b34.0101.010e.04200401.01040000] = 00 00 00 32
>   ComponentMaxRef = 65535
>   ComponentMinRef = 0
>   ScanningDirection = 0
>   PixelLayout = <Unknown>
> 
> A client has received samples which are multiple MXFs, each one
> containing just a single j2k image.
> 
> Anyway I will push this patch later today,

Pushed

/Tomas
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