annex.b.superframes.md

Annex B: Raw Bitstream Format

{:.no_count}

Overview

{:.no_count}

An AV1 bitstream consists of a number of OBUs that are normally held within a container format alongside audio and timing information.

This annex defines a simple method of packing OBUs into a raw bitstream format.

Raw Bitstream Syntax

{:.no_count}

raw_bitstream( sz ) {
    while ( sz > 0 ) {
        @@obu_size                                                             le(4)
        open_bitstream_unit( obu_size )
        sz -= 4 + obu_size
    }
}

{:.syntax }

Raw Bitstream semantics

{:.no_count}

sz specifies the number of bytes in the entire bitstream and is provided by external means.

obu_size specifies the size in bytes of the next OBU.