Chiebot-Mirror/FFmpeg - FFmpeg - Gitea: Git with a cup of tea

Author	SHA1	Message	Date
Niklas Haas	beac4a999c	avcodec/fflcms2: add ff_icc_profile_sanitize Buggy ICCv4 profiles are unfortunately used in the wild, and it's quite easy to work around them by just forcing the white point to the correct value. Display a warning just in case. See-Also: https://trac.ffmpeg.org/ticket/9673	1 year ago
Niklas Haas	1cbd4552fe	fflcms2: move to libavcodec We will need this helper inside libavcodec in the future, so move it there, leaving behind an #include to the raw source file in its old location in libvfilter. This approach is inspired by the handling of vulkan.c, and avoids us needing to expose any of it publicly (or semi-publicly) in e.g. libavutil, thus avoiding any ABI headaches. It's debatable whether the actual code belongs in libavcodec or libavfilter, but I decided to put it into libavcodec because it conceptually deals with encoding and decoding ICC profiles, and will be used to decode embedded ICC profiles in image files. Signed-off-by: Niklas Haas <git@haasn.dev>	2 years ago
Leo Izen	d42b410e05	avutil/csp: create public API for colorspace structs This commit moves some of the functionality from avfilter/colorspace into avutil/csp and exposes it as a public API so it can be used by libavcodec and/or libavformat. It also converts those structs from double values to AVRational to make regression testing easier and more consistent. Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>	3 years ago
Niklas Haas	b9a25963f7	lavfi: add ICC profile support via lcms2 This introduces an optional dependency on lcms2 into FFmpeg. lcms2 is a widely used library for ICC profile handling, which apart from being used in almost all major image processing programs and video players, has also been deployed in browsers. As such, it's both widely available and well-tested. Add a few helpers to cover our major use cases. This commit merely introduces the helpers (and configure check), even though nothing uses them yet. It's worth pointing out that the reason the cmsToneCurves for each AVCOL_TRC are cached inside the context, is because constructing a cmsToneCurve requires evaluating the curve at 4096 (by default) grid points and constructing a LUT. So, we ideally only want to do this once per curve. This matters for e.g. ff_icc_profile_detect_transfer, which essentially compares a profile against all of these generated LUTs. Re-generating the LUTs for every iteration would be unnecessarily wasteful. The same consideration does not apply to e.g. cmsCreate*Profile, which is a very lightweight operation just involving struct allocation and setting a few pointers. The cutoff value of 0.01 was determined by experimentation. The lowest "false positive" delta I saw in practice was 0.13, and the largest "false negative" delta was 0.0008. So a value of 0.01 sits comfortaby almost exactly in the middle. Signed-off-by: Niklas Haas <git@haasn.dev>	3 years ago