FFmpeg currently handles alpha in a quasi-arbitrary way. Some filters/codecs
assume alpha is premultiplied, others assume it is independent. If there is
to be any hope for order in this chaos, we need to start by defining an enum
for the possible range of values.
Just do it like av_frame_replace().
Also "fixes" the swapped order or arguments to av_malloc_array()
(the first is supposed to be the number of elements, the second
the size of an element) and therefore part of ticket #11620.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
(I don't know whether this can be triggered for a file with
nonnegative channel count, given that src's extended data can't
have been allocated in this case.)
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This is possible without deprecation period, because said field
is documented as only for our libav* libraries and not the general
public.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
Signed-off-by: James Almer <jamrial@gmail.com>
This function can return AVERROR_BUG in theory if something
went wrong, but so can the caller, so we should propagate that
error message upward in that case.
Signed-off-by: Leo Izen <leo.izen@gmail.com>
As discussed in the previous commit, we often need a convenient way of
stripping all side data related to a certain aspect of the frame. This helper
accomplishes just that.
I considered also adding a way to match only side data matching *all*
properties, but I think this is sufficiently useless in practise to not warrant
inclusion in the API.
Many filters modify certain aspects of frame data, e.g. through resizing
(vf_*scale* family), color volume mapping (vf_lut*, vf_tonemap*), or
possibly others.
When this happens, we should strip all frame side data that will no
longer be correct/relevant after the operation. For example, changing
the image size should invalidate AV_FRAME_DATA_PANSCAN because the crop
window (given in pixels) no longer corresponds to the actual image size.
For another example, tone-mapping filters (e.g. from HDR to SDR) should
strip all of the dynamic HDR related metadata.
Since there are a lot of different side data types that are affected by such
operations, it makes sense to establish this information in a common, easily
accessible way. The existing side data properties enum is a perfect fit for
this.
This avoids unpleasant surprises to av_frame_get_buffer callers
that explicitly specified 64-byte alignment and didn't get
AVFrame.data pointers that are 64-byte aligned.
For example, see https://github.com/sekrit-twc/zimg/issues/212
Although the zscale issue has already been resolved by other means
it would still be prudent to improve the behavior of av_frame_get_buffer
to fix any unknown and future instances of similar issues.
Co-authored-by: James Almer <jamrial@gmail.com>
Signed-off-by: James Almer <jamrial@gmail.com>
STRIDE_ALIGN is a lavc define and is not necessarely 32. And align may be <= 0 at the
point plane_padding is being set.
Signed-off-by: James Almer <jamrial@gmail.com>
This puts lavu frame buffer allocator helpers in sync with lavc's decoder frame
buffer allocator's STRIDE_ALIGN define.
Remove the comment about av_cpu_max_align() while at it as using it is not
ideal when CPU flags can be changed mid process.
Should fix ticket #11116.
Signed-off-by: James Almer <jamrial@gmail.com>
Also use sizeof of the proper type, namely sizeof(**sd)
and not sizeof(*sd).
Reviewed-by: Jan Ekström <jeebjp@gmail.com>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
av_frame_side_data_get() has a const AVFrameSideData * const *sd
parameter; so calling it with an AVFramesSideData **sd like
AVCodecContext.decoded_side_data (or with a AVFramesSideData * const
*sd) is safe, but the conversion is not performed automatically
in C. All users of this function therefore resort to a cast.
This commit changes this: av_frame_side_data_get() is renamed
to av_frame_side_data_get_c(); furthermore, a static inline
wrapper for it name av_frame_side_data_get() is added
that accepts an AVFramesSideData * const * and converts this
to const AVFramesSideData * const * in a Wcast-qual safe way.
This also allows to remove the casts from the current users.
Reviewed-by: Jan Ekström <jeebjp@gmail.com>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
av_image_copy() accepts const uint8_t* const * as source;
lots of user have uint8_t* const * and therefore either
cast (the majority) or copy the array of pointers.
This commit changes this by adding a static inline wrapper
for av_image_copy() that casts between the two types
so that we do not need to add casts everywhere else.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
Not only this is information that relies on the concept of a sequence of
frames, which is completely out of place as a field in AVFrame, but there are
no known or intended uses of this field.
Signed-off-by: James Almer <jamrial@gmail.com>
