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Support hvc1 box & enable simple access of hevc parameter sets #128

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Support hvc1 box & enable simple access of hevc parameter sets #128

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Commits on Oct 22, 2023

  1. Support hvc1 box & enable simple access of hevc parameter sets 

    I have an HEVC mp4 file of the `hvc1` kind. In order to construct
the decoder (using Apple VideoToolbox) I need the PPS, SPS, VPS
parameter sets.

This PR does two things:
1. It adds parsing for the `hvc1` box. This appears similar to `hev1`
   at least at the 'trak' level. In my files, there are additional
   inner boxes, for example a `colr` box. I therefore skip nested
   boxes.
1. Enable hevc accessors for the vps, pps, sps properties that are
   required to initialise many decoders.

I should note here - I have no _particular_ video decoding knowledge,
but do have some experience with binary formats and software engineering
in general - have reverse engineered what I need in order to solve my
present problem by looking at output from the `MP4Box` tool.
    @j-baker
    j-baker committed Oct 22, 2023
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  2. remove println

    @j-baker
    j-baker committed Oct 22, 2023
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  3. clippy

    @j-baker
    j-baker committed Oct 22, 2023
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