swscale/utils: add SwsFormat abstraction and helpers

Groups together all relevant color metadata from an AVFrame. While we could
use AVFrame directly, keeping it a separate struct has three advantages:

1. Functions accepting an SwsFormat will definitely not care about the
   data pointers.
2. It clearly separates sanitized and raw metadata, since the function to
   construct an SwsFormat from an AVFrame will also sanitize.
3. It's slightly more lightweight to pass around.

Move these into a new header file "utils.h" to avoid crowding
swscale_internal.h even more, and also to solve a circular dependency issue
down the line.

Sponsored-by: Sovereign Tech Fund
Signed-off-by: Niklas Haas <git@haasn.dev>

0 files changed, 0 insertions, 0 deletions