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feat: decode H.265 with VA-API on Linux - #372
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AMD's encoder takes no picture below 384x128, which WebRTC scales down to. Smaller frames are coded in a picture of that size and cropped by the SPS.
Adds an H.265 Main decoder for Intel and AMD GPUs, with its own parser for the parameter sets and slice headers. VA-API decoding no longer needs webrtc.hardware.vaapiExperimental, which is removed.
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Adds an H.265 Main decoder for Intel and AMD GPUs through VA-API, with its own parser for the parameter sets and slice headers. VA-API decoding (VP9 and H.265) no longer needs
webrtc.hardware.vaapiExperimental, which is removed.Also codes H.265 pictures smaller than 384x128 at that size and crops them, since AMD's encoder takes nothing smaller.
Builds on #371; streams with scaling lists are not decoded.