avcodec/libdav1d: add an option to toggle Film Grain

Signed-off-by: James Almer <jamrial@gmail.com>

libavcodec/libdav1d.c

@@ -34,6 +34,7 @@ typedef struct Libdav1dContext {
 
     Dav1dData data;
     int tile_threads;
+    int apply_grain;
 } Libdav1dContext;
 
 static av_cold int libdav1d_init(AVCodecContext *c)
@@ -46,6 +47,7 @@ static av_cold int libdav1d_init(AVCodecContext *c)
 
     dav1d_default_settings(&s);
     s.n_tile_threads = dav1d->tile_threads;
+    s.apply_grain = dav1d->apply_grain;
     s.n_frame_threads = FFMIN(c->thread_count ? c->thread_count : av_cpu_count(), DAV1D_MAX_FRAME_THREADS);
 
     res = dav1d_open(&dav1d->c, &s);
@@ -216,6 +218,7 @@ static av_cold int libdav1d_close(AVCodecContext *c)
 #define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM
 static const AVOption libdav1d_options[] = {
     { "tilethreads", "Tile threads", OFFSET(tile_threads), AV_OPT_TYPE_INT, { .i64 = 1 }, 1, DAV1D_MAX_TILE_THREADS, VD },
+    { "filmgrain", "Apply Film Grain", OFFSET(apply_grain), AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, VD },
     { NULL }
 };