video: redo video equalizer option handling

I really wouldn't care much about this, but some parts of the core code
are under HAVE_GPL, so there's some need to get rid of it. Simply turn
the video equalizer from its current fine-grained handling with vf/vo
fallbacks into global options. This makes updating them much simpler.

This removes any possibility of applying video equalizers in filters,
which affects vf_scale, and the previously removed vf_eq. Not a big
loss, since the preferred VOs have this builtin.

Remove video equalizer handling from vo_direct3d, vo_sdl, vo_vaapi, and
vo_xv. I'm not going to waste my time on these legacy VOs.

vo.eq_opts_cache exists _only_ to send a VOCTRL_SET_EQUALIZER, which
exists _only_ to trigger a redraw. This seems silly, but for now I feel
like this is less of a pain. The rest of the equalizer using code is
self-updating.

See commit 96b906a51d5 for how some video equalizer code was GPL only.
Some command line option names and ranges can probably be traced back to
a GPL only committer, but we don't consider these copyrightable.

1 files changed, 0 insertions, 31 deletions

diff --git a/video/sws_utils.c b/video/sws_utils.c
index 974a111e83..b1ab499f68 100644
--- a/video/sws_utils.c
+++ b/video/sws_utils.c
@@ -291,37 +291,6 @@ int mp_image_sw_blur_scale(struct mp_image *dst, struct mp_image *src,
     return res;
 }
 
-int mp_sws_get_vf_equalizer(struct mp_sws_context *sws, struct vf_seteq *eq)
-{
-    if (!sws->supports_csp)
-        return 0;
-    if (!strcmp(eq->item, "brightness"))
-        eq->value =  ((sws->brightness * 100) + (1 << 15)) >> 16;
-    else if (!strcmp(eq->item, "contrast"))
-        eq->value = (((sws->contrast  * 100) + (1 << 15)) >> 16) - 100;
-    else if (!strcmp(eq->item, "saturation"))
-        eq->value = (((sws->saturation * 100) + (1 << 15)) >> 16) - 100;
-    else
-        return 0;
-    return 1;
-}
-
-int mp_sws_set_vf_equalizer(struct mp_sws_context *sws, struct vf_seteq *eq)
-{
-    if (!sws->supports_csp)
-        return 0;
-    if (!strcmp(eq->item, "brightness"))
-        sws->brightness = ((eq->value << 16) + 50) / 100;
-    else if (!strcmp(eq->item, "contrast"))
-        sws->contrast   = MPMAX(1, (((eq->value + 100) << 16) + 50) / 100);
-    else if (!strcmp(eq->item, "saturation"))
-        sws->saturation = (((eq->value + 100) << 16) + 50) / 100;
-    else
-        return 0;
-
-    return mp_sws_reinit(sws) >= 0 ? 1 : -1;
-}
-
 static const int endian_swaps[][2] = {
 #if BYTE_ORDER == LITTLE_ENDIAN
 #if defined(AV_PIX_FMT_YA16) && defined(AV_PIX_FMT_RGBA64)