Av1ObuUtil

java-static fun extractHagcMetadataAndStripAllT35Metadata(buffer: ByteBuffer!): Array<Byte>?

Extracts HAGC (ST 2094-50) metadata from the first valid HAGC ITU-T T.35 metadata OBU in the buffer. If one is found, all ITU-T T.35 metadata OBUs in the buffer (including HAGC and HDR10+) are rewritten as unknown metadata OBUs so that the decoder does not prefer any in-band T.35 metadata over the returned HAGC metadata.

If no valid HAGC metadata OBU is found, buffer remains unchanged. In either case, the position() and limit() of buffer remain unchanged.

java-static fun stripAllT35Metadata(buffer: ByteBuffer!): Unit

Rewrites all ITU-T T35 metadata OBUs from the buffer. This is done to prevent the decoder from prioritizing in-band T.35 metadata (like HDR10+, Dolby Vision, etc.) over out-of-band metadata. If a T.35 metadata OBU is found, buffer will be rewritten with that metadata OBU marked as an unknown metadata OBU. If no T.35 metadata OBUs are found, buffer will remain unchanged. In either case, the position() and limit() of the buffer remain unchanged.

java-static fun stripNonHdr10PlusT35Metadata(buffer: ByteBuffer!): Unit

Rewrites all ITU-T T35 metadata OBUs from the buffer that are not HDR10+. This is done to prevent the decoder on older SDK versions from misinterpreting them as HDR10+ metadata. If a non-HDR10+ metadata OBU is found, buffer will be rewritten with that metadata OBU marked as an unknown metadata OBU. If no non-HDR10+ metadata OBUs are found, buffer will remain unchanged. In either case, the position() and limit() of the buffer remain unchanged. This function is needed only when using MediaCodec on older SDK versions and is not necessary for other AV1 decoders.