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Add Mediabunny Codec Registry

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<script setup>
import { VPBadge } from 'vitepress/theme'
</script>
<VPBadge type="info" text="Video codec" />
# HEVC (H.265) codec registration
## Description
The High Efficiency Video Coding (H.265) video codec, specified in [Rec. ITU-T H.265](https://www.itu.int/rec/T-REC-H.265) / [ISO/IEC 23008-2](https://www.iso.org/standard/75484.html).
An HEVC bitstream can have either of two formats:
- _Canonical_ (length-prefixed), as defined in [ISO/IEC 14496-15](https://www.iso.org/standard/89118.html) Section 8.3.2. Here, video parameter sets (VPS/SPS/PPS) are provided out-of-band.
- _Annex B_, as defined in [Rec. ITU-T H.265](https://www.itu.int/rec/T-REC-H.265) Annex B. Here, video parameter sets (VPS/SPS/PPS) must be provided in-band in the respective NALUs.
All packets within the bitstream must have the same format.
## Codec ID
```ts
'hevc'
```
## `EncodedPacket` data
The packet's data must be an access unit as defined in [Rec. ITU-T H.265](https://www.itu.int/rec/T-REC-H.265) Section 7.4.2.4, containing exactly one base layer coded picture, in either _canonical_ or _Annex B_ format.
## `EncodedPacket` type
If the packet's type is `'key'`, then the packet is expected to contain an IDR, CRA, or BLA picture. Additionally, if the bitstream's format is _Annex B_, then this packet is also expected to contain the necessary video parameter sets to initialize the decoder.
## `VideoDecoderConfig` codec string
The full codec string begins with the prefix `'hev1.'` or `'hvc1.'`, with a variable-length suffix of four dot-separated fields as specified in Section E.3 of [ISO/IEC 14496-15](https://www.iso.org/standard/89118.html).
## `VideoDecoderConfig` description
If the bitstream is in the _canonical_ (length-prefixed) format, `description` must be an `HEVCDecoderConfigurationRecord` as defined in [ISO/IEC 14496-15](https://www.iso.org/standard/89118.html) Section 8.3.3.1.
If the bitstream is in the _Annex B_ format, `description` must be undefined.