Op zo 13 okt 2024 om 02:16 schreef Stefan Oltmanns <stefan-oltma...@gmx.net>: > > I cannot find any clues in the documentation how to write a > seektable/reserve space for it. > Can someone help me out? >
There's actually quite a lot of documentation for this. Please review https://xiph.org/flac/api/group__flac__stream__encoder.html#ga80d57f9069e354cbf1a15a3e3ad9ca78 I quote: > SEEKTABLE blocks are handled specially. Since you will not know the > values for the seek point stream offsets, you should pass in a > SEEKTABLE 'template', that is, a SEEKTABLE object with the required > sample numbers (or placeholder points), with 0 for the frame_samples > and stream_offset fields for each point. If the client has specified > that it supports seeking by providing a seek callback to > FLAC__stream_encoder_init_stream() or both seek AND read callback to > FLAC__stream_encoder_init_ogg_stream() (or by using > FLAC__stream_encoder_init*_file() or > FLAC__stream_encoder_init*_FILE()), then while it is encoding the > encoder will fill the stream offsets in for you and when encoding is > finished, it will seek back and write the real values into the > SEEKTABLE block in the stream. There are helper routines for > manipulating seektable template blocks; see metadata.h: > FLAC__metadata_object_seektable_template_*(). If the client does not > support seeking, the SEEKTABLE will have inaccurate offsets which will > slow down or remove the ability to seek in the FLAC stream. Also, take a look at this: https://xiph.org/flac/api/group__flac__metadata__object.html#gab91c8b020a1da37d7524051ae82328cb Hope that helps. Also, as I'm always extra curious when FLAC is used for non-audio purposes: could you perhaps say a little bit about what kind of signals you're compressing? Kind regards, Martijn van Beurden _______________________________________________ flac-dev mailing list flac-dev@xiph.org http://lists.xiph.org/mailman/listinfo/flac-dev
