Hvcc support #147
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Hvcc support #147
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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.
Opus support
…luding various profile and constraint parameters.
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