From: WATANABE Osamu <owatanab@es.takushoku-u.ac.jp>
To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
Subject: Re: [FFmpeg-devel] [PATCH v3 2/3] avcodec/jpeg2000dec: Add support for placeholder passes
Date: Mon, 24 Jun 2024 10:11:09 +0000
Message-ID: <AF569076-C99E-48AD-A2D5-42D7126BE679@es.takushoku-u.ac.jp> (raw)
In-Reply-To: <AS8P250MB074401773A44C281D002FA078FD42@AS8P250MB0744.EURP250.PROD.OUTLOOK.COM>
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 <andreas.rheinhardt@outlook.com>のメール:
>
> ?Osamu Watanabe:
>> This commit adds support for placeholder pass parsing
>>
>
> What is a placeholder pass?
>
>> Signed-off-by: Osamu Watanabe <owatanab@es.takushoku-u.ac.jp>
>> ---
>> libavcodec/jpeg2000.h | 2 +
>> libavcodec/jpeg2000dec.c | 292 +++++++++++++++++++++++++++++++------
>> libavcodec/jpeg2000htdec.c | 18 +--
>> 3 files changed, 257 insertions(+), 55 deletions(-)
>>
>
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next prev parent reply other threads:[~2024-06-24 10:11 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-06-24 6:19 [FFmpeg-devel] [PATCH v3 1/3] avcodec/jpeg2000dec: Add support for CAP and CPF markers Osamu Watanabe
2024-06-24 6:19 ` [FFmpeg-devel] [PATCH v3 2/3] avcodec/jpeg2000dec: Add support for placeholder passes Osamu Watanabe
2024-06-24 9:34 ` Andreas Rheinhardt
2024-06-24 10:11 ` WATANABE Osamu [this message]
2024-06-24 6:19 ` [FFmpeg-devel] [PATCH v3 3/3] avcodec/jpeg2000dec: Fix HT decoding Osamu Watanabe
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