Am 14.06.23 um 04:04 schrieb James Zern:
On Thu, Jun 8, 2023 at 7:21 AM Thilo Borgmann <thilo.borgm...@mail.de> wrote:
From: Josef Zlomek <jo...@pex.com>
Fixes: 4907
Adds support for decoding of animated WebP.
The WebP decoder adds the animation related features according to the specs:
https://developers.google.com/speed/webp/docs/riff_container#animation
The frames of the animation may be smaller than the image canvas.
Therefore, the frame is decoded to a temporary frame,
then it is blended into the canvas, the canvas is copied to the output frame,
and finally the frame is disposed from the canvas.
The output to AV_PIX_FMT_YUVA420P/AV_PIX_FMT_YUV420P is still supported.
The background color is specified only as BGRA in the WebP file
so it is converted to YUVA if YUV formats are output.
Signed-off-by: Josef Zlomek <jo...@pex.com>
---
Changelog | 1 +
libavcodec/codec_desc.c | 3 +-
libavcodec/version.h | 2 +-
libavcodec/webp.c | 714 ++++++++++++++++++++++++++++++++++++----
4 files changed, 658 insertions(+), 62 deletions(-)
[...]
+
+ bytestream2_skip(&gb, 2); // loop count is ignored
TODO? APNG and GIF support looping and have -ignore_loop to control it.
Will look into this maybe supporting it in v2. Otherwise making it a TODO.
Thanks,
Thilo
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