Commits on Jun 6, 2024

1. Support for the Multiview extension of H.265/HEVC …

   - A fix for the parsing of the SPS is provided. This is because for
     NALUs associated with layers whose identifier is greater than 0 the
     spec requires the decoder to parse sps_ext_or_max_sub_layers_minus1
     (see F.7.3.2.2.1). The value of this syntax element is then used to
     infer the value for sps_max_sub_layers_minus1 as specified in Clause
     F.7.4.3.2.1. The current design would led to have
     sps_max_sub_layers_minus1 equal to zero. This is fine for streams
     captured by devices such as Apple iPhones since the value for
     sps_ext_or_max_sub_layers_minus1 is set to 7 and the spec in this case
     mandates that sps_max_sub_layers_minus1 assumes the same value
     transmitted in the SPS. However, different encoders might be setting
     sps_ext_or_max_sub_layers_minus1 to a different value, thus also
     sps_max_sub_layers_minus1 will be different from the value parsed in
     the VPS. The fix proposed in av_parser.c::gf_hevc_read_sps_bs_internal
     addresses some discrepancy between the implementation and the spec.
   - Support is added to parse and embed in a .mov file the three
     dimension reference displays info SEI message from Clause G.14.2.3.3.
     Such a supplemental information is required to play Multiview content
     on devices such as the Apple Vision Pro. Having MP4box embedding such
     information would allow users to wrap Annex B HEVC streams into .mov
     containers.

   

   matteovn committed Jun 6, 2024
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