On Sun, 25 Feb 2024 12:44:49 +0100 Niklas Haas <ffm...@haasn.xyz> wrote: > From: Niklas Haas <g...@haasn.dev> > > Instead of the nal_prefix, this profile inside wraps the RPU inside an > EMDF header, as specified in ETSI TS 102 366. This particular usage is > supposedly specified in ETSI TS 103 572, at least according to European > Patent EP 3 588 964 A1, but I could not find any references to DV RPUs > in the former. > > It's worth pointing out that the EMDF container is not byte-aligned, > meaning that payloads are delivered at arbitrary byte boundaries. Hence > the reason for doing it inside ff_dovi_rpu_parse, which already uses > a bitstream reader, rather than splitting off the container in > a separate stage. (Plus, we hard-code the DV-specific payload ID) > > Magic values were taken from a combination of the sources below, all of > which agree about what the specific EMDF header should look like. In > fact, they all hard-code a very *specific* header sequence, but I wanted > to go the extra mile and at least properly skip the variable fields > - even though the non-existent Dolby Vision specification probably > specifies that they all must be 0. This is probably overkill. > > Validated and tested using sample files from the merge request linked > below. > > Relevant links: > - > https://www.etsi.org/deliver/etsi_ts/102300_102399/102366/01.04.01_60/ts_102366v010401p.pdf > - > https://patentimages.storage.googleapis.com/8a/0b/da/28294acaed2182/EP3588964A1.pdf > - > https://www.etsi.org/deliver/etsi_ts/103500_103599/103572/01.03.01_60/ts_103572v010301p.pdf > - > https://github.com/rockchip-linux/mpp/blob/fdeb8c378b79d4b4ef80457e4431815de89dc417/mpp/codec/dec/av1/av1d_cbs.c#L2378 > - > https://github.com/elginsk8r/android_kernel_amlogic_linux-4.9/blob/23a4c38bf06ef34821e476a8edddbf9213712c8a/drivers/amlogic/media/enhancement/amdolby_vision/amdolby_vision.c#L5638 > - https://gitlab.com/mbunkus/mkvtoolnix/-/merge_requests/2254
Ping. Is there anybody who could kindly review this? _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".
