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, 3 insertions, 16 deletions

diff --git a/video/out/vo_opengl.c b/video/out/vo_opengl.c
index 02a7318970..72691e56c2 100644
--- a/video/out/vo_opengl.c
+++ b/video/out/vo_opengl.c
@@ -262,22 +262,9 @@ static int control(struct vo *vo, uint32_t request, void *data)
     case VOCTRL_SET_PANSCAN:
         resize(p);
         return VO_TRUE;
-    case VOCTRL_GET_EQUALIZER: {
-        struct voctrl_get_equalizer_args *args = data;
-        struct mp_csp_equalizer *eq = gl_video_eq_ptr(p->renderer);
-        bool r = mp_csp_equalizer_get(eq, args->name, args->valueptr) >= 0;
-        return r ? VO_TRUE : VO_NOTIMPL;
-    }
-    case VOCTRL_SET_EQUALIZER: {
-        struct voctrl_set_equalizer_args *args = data;
-        struct mp_csp_equalizer *eq = gl_video_eq_ptr(p->renderer);
-        if (mp_csp_equalizer_set(eq, args->name, args->value) >= 0) {
-            gl_video_eq_update(p->renderer);
-            vo->want_redraw = true;
-            return VO_TRUE;
-        }
-        return VO_NOTIMPL;
-    }
+    case VOCTRL_SET_EQUALIZER:
+        vo->want_redraw = true;
+        return VO_TRUE;
     case VOCTRL_SCREENSHOT_WIN: {
         struct mp_image *screen = gl_read_fbo_contents(p->gl, p->glctx->main_fb,
                                                        vo->dwidth, vo->dheight);