1510 Broadcast WAVE 2 WAVEFORMATEXTENSIBLE Encoding BWAVE (2), BWF (2) WAVE Audio Broadcast WAVE is a chunk-based audio format developed by the European Broadcasting Union, and based on the Microsoft WAVE format, which is in turn based on the generic Resource Interchange File Format (RIFF) specification developed by Microsoft and IBM. Structurally, a BWAVE file is composed of a number of chunks, each comprising a four character code chunk identifier, the chunk size, and the chunk data. It comprises a RIFF header with a WAVE data type identifier, followed by a series of chunks. Every file must include a Broadcast Audio Extension chunk, containing metadata required for exchange of information between broadcasters, a Format chunk, which describes the format of the audio data, and a Data chunk, containing the audio data itself. BWAVE files which contain MPEG-encoded audio data must also include a Fact chunk, containing file-dependent information about the audio data, and an MPEG Audio Extension chunk, containing extra information required to describe the MPEG encoding. 178 National Library of New Zealand / National Library of New Zealand 11 Feb 2015 11 Feb 2015 audio/x-wav MIME fmt/711 PUID wav File extension 1008 BWAVE WAVEFORMATEXTENSIBLE 2 RIFF header, WAVE ID, Format chunk (WAVEFORMATEXTENSIBLE), BEXT chunk (Version=2) 1 Absolute from BOF 0 0 52494646{4}57415645*666D7420{4}FEFF*62657874{350}0200 1037 BWAVE WAVEFORMATEXTENSIBLE 2 variant RIFF header, WAVE ID, BEXT chunk (Version=2), Format chunk (WAVEFORMATEXTENSIBLE) 1 Absolute from BOF 0 0 52494646{4}57415645*62657874{350}0200*666D7420{4}FEFF Has priority over 654 Waveform Audio Has priority over 786 Waveform Audio (WAVEFORMATEXTENSIBLE) Has priority over 1314 Broadcast WAVE