(feature request) : `cue ` chunks

iluvcapra / wavinfo

Probe WAVE Files for all metadata

https://wavinfo.readthedocs.io/

MIT License

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(feature request) : `cue ` chunks #18

Closed fenugrec closed 1 year ago

fenugrec commented 1 year ago

Apparently 'cue' chunks are defined since the first 1991 specs from IBM & MS : https://www.aelius.com/njh/wavemetatools/doc/riffmci.pdf . Some recorders (at least some Tascam and Zoom handhelds) use this feature for markers : during recording, one can press a button that creates a mark at the current time.

It would be nice for wavinfo to be able to parse this chunk type, and ideally iterate over a list of cue points (would be useful for e.g. splitting a file, which is my usecase).

fenugrec commented 1 year ago

From that doc, the structure of the cue chunk is fairly simple :

// describes one cuepoint
struct cue_point {
    DWORD dwName;
    DWORD dwPosition;
    FOURCC fccChunk;
    DWORD dwChunkStart;
    DWORD dwBlockStart;
    DWORD dwSampleOffset;
}

struct cue_chunk {
    FOURCC "cue ";
    DWORD chunk_size; (the usual method)
    DWORD dwCuePoints;   // Count of cue points
    struct cue_point cue_points[dwCuePoints];
}

Attached is an example wav file with this type of metadata : STE-000.wav.zip