forked from unom/punktfunk
enricobuehlerandClaude Opus 4.8
c3fa6c1514
The Apple client was HEVC/H.264-only: the receive path spoke Annex-B NALs exclusively, so AV1 was never advertised and the codec picker hid it. Add the OBU flavor of the same plumbing (AV1.swift, sibling of AnnexB.swift): a zero-copy OBU walker, a full spec-5.5.1 sequence-header parser, an av1C CMVideoFormatDescription with colorimetry extensions (so isHDRFormat and the presenter stay codec-agnostic), and an ISOBMFF 'av01' sample repack (temporal delimiter stripped, everything size-fielded, one copy per AU). VideoCodec gains .av1 (wire 0x04); both pumps and VideoDecoder route through dispatching formatDescription(fromKeyframe:)/sampleBuffer(au:) — keyframe gating keys on the in-band sequence header exactly as the NAL codecs key on in-band parameter sets, so loss recovery and mid-session reconfigure work unchanged. AV1 sessions require a hardware decoder (VideoToolbox has no software AV1; same fail-fast policy as 4:4:4), and both the Hello advertisement and the Settings picker are gated on VTIsHardwareDecodeSupported — AV1 only appears on devices that can actually decode it (M3-class Macs, A17 Pro-class iPhones; no Apple TV). Tests: real SVT-AV1 blobs (generation recipe in the file) cover the walk, the parse against an independent reference, av1C bytes, delta-TU gating, repack byte-exactness, and — on AV1 hardware — a real VTDecompressionSession decode through VideoDecoder. Host precedence stays HEVC > AV1 > H.264, so AV1 engages only when explicitly picked. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>