Placeholder pass is a coding pass having zero length. It is necessary to keep pass boundaries of layers for the transcoding from HT to non HT codestream. It is defined in the spec of HTJ2K.
A detaled explanation is available at https://ds.jpeg.org/documents/jpeg2000/wg1n100680-101-COM-Guideline_on_Placeholder_Passes_and_Multiple_HT_Sets_in_HTJ2K_codestreams.zip > 2024/06/24 18:34、Andreas Rheinhardt <[email protected]>のメール: > > ?Osamu Watanabe: >> This commit adds support for placeholder pass parsing >> > > What is a placeholder pass? > >> Signed-off-by: Osamu Watanabe <[email protected]> >> --- >> libavcodec/jpeg2000.h | 2 + >> libavcodec/jpeg2000dec.c | 292 +++++++++++++++++++++++++++++++------ >> libavcodec/jpeg2000htdec.c | 18 +-- >> 3 files changed, 257 insertions(+), 55 deletions(-) >> > > _______________________________________________ > ffmpeg-devel mailing list > [email protected] > https://ffmpeg.org/mailman/listinfo/ffmpeg-devel > > To unsubscribe, visit link above, or email > [email protected] with subject "unsubscribe". _______________________________________________ ffmpeg-devel mailing list [email protected] https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe".
