Module bitstream_filter

Expand description

Bitstream filters for codec-level NAL and OBU transformations.

Provides conversions between AnnexB and AVCC/HVCC packet formats, SPS/PPS/VPS extraction, and AV1 OBU sequence header parsing.

Structs§

Av1Obu: A parsed AV1 OBU unit with its type and payload bytes.
Av1SequenceHeader: High-level fields extracted from an AV1 sequence header OBU.
NalUnit: A parsed, classified NAL unit from an H.264 or H.265 bitstream.

Av1ObuType: AV1 Open Bitstream Unit (OBU) types per the AV1 specification §5.3.2.
BitstreamFilterError: Errors that can occur during bitstream filtering operations.
H264NalType: H.264 NAL unit types relevant for parameter set extraction.
LengthPrefixSize: Number of bytes used to encode each NAL length in AVCC/HVCC format.

annexb_to_avcc: Convert an AnnexB packet to AVCC/HVCC length-prefixed format.
avcc_to_annexb: Convert an AVCC/HVCC length-prefixed packet to AnnexB start-code format.
extract_pps: Extract all PPS NAL units from an AnnexB bitstream.
extract_sps: Extract all SPS NAL units from an AnnexB bitstream.
extract_sps_pps: Extract both SPS and PPS NAL units from an AnnexB bitstream as owned bytes.
find_av1_sequence_header: Find and parse the first AV1 sequence header OBU found in a bitstream.
parse_av1_sequence_header: Parse the fields of an AV1 sequence header OBU payload.
remove_emulation_prevention: Remove H.264/H.265 emulation prevention bytes (0x03) from a RBSP.
split_annexb: Split an AnnexB byte stream into individual raw NAL unit byte slices.
split_av1_obus: Split a contiguous AV1 bitstream (e.g., from an ISOBMFF av01 sample) into individual OBU units.