snow: Move scenechange_threshold to a private option

Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>

libavcodec/snow.h

@@ -177,6 +177,7 @@ typedef struct SnowContext{
     int intra_penalty;
     int motion_est;
     int iterative_dia_size;
+    int scenechange_threshold;
 
     MpegEncContext m; // needed for motion estimation, should not be used for anything else, the idea is to eventually make the motion estimation independent of MpegEncContext, so this will be removed then (FIXME/XXX)
 

libavcodec/snowenc.c

@@ -1739,10 +1739,17 @@ redo_frame:
                 }
             predict_plane(s, s->spatial_idwt_buffer, plane_index, 0);
 
+#if FF_API_PRIVATE_OPT
+FF_DISABLE_DEPRECATION_WARNINGS
+            if(s->avctx->scenechange_threshold)
+                s->scenechange_threshold = s->avctx->scenechange_threshold;
+FF_ENABLE_DEPRECATION_WARNINGS
+#endif
+
             if(   plane_index==0
                && pic->pict_type == AV_PICTURE_TYPE_P
                && !(avctx->flags&AV_CODEC_FLAG_PASS2)
-               && s->m.me.scene_change_score > s->avctx->scenechange_threshold){
+               && s->m.me.scene_change_score > s->scenechange_threshold){
                 ff_init_range_encoder(c, pkt->data, pkt->size);
                 ff_build_rac_states(c, (1LL<<32)/20, 256-8);
                 pic->pict_type= AV_PICTURE_TYPE_I;
@@ -1909,6 +1916,7 @@ static const AVOption options[] = {
     { "no_bitstream",   "Skip final bitstream writeout.",                    OFFSET(no_bitstream), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, VE },
     { "intra_penalty",  "Penalty for intra blocks in block decission",      OFFSET(intra_penalty), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, VE },
     { "iterative_dia_size",  "Dia size for the iterative ME",          OFFSET(iterative_dia_size), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, VE },
+    { "sc_threshold",   "Scene change threshold",                   OFFSET(scenechange_threshold), AV_OPT_TYPE_INT, { .i64 = 0 }, INT_MIN, INT_MAX, VE },
     { NULL },
 };