vf_yadif: add an option to enable/disable deinterlacing based on src frame "interlaced" flag

Signed-off-by: Joakim Plate <elupus@ecce.se>
Signed-off-by: Anton Khirnov <anton@khirnov.net>

1 files changed, 26 insertions, 2 deletions

diff --git a/libavfilter/vf_yadif.c b/libavfilter/vf_yadif.c
index 42a7219d26..aa5c434af9 100644
--- a/libavfilter/vf_yadif.c
+++ b/libavfilter/vf_yadif.c
@@ -46,6 +46,12 @@ typedef struct {
 
     int frame_pending;
 
+    /**
+     *  0: deinterlace all frames
+     *  1: only deinterlace frames marked as interlaced
+     */
+    int auto_enable;
+
     AVFilterBufferRef *cur;
     AVFilterBufferRef *next;
     AVFilterBufferRef *prev;
@@ -242,6 +248,14 @@ static void start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
     if (!yadif->cur)
         return;
 
+    if (yadif->auto_enable && !yadif->cur->video->interlaced) {
+        yadif->out  = avfilter_ref_buffer(yadif->cur, AV_PERM_READ);
+        avfilter_unref_buffer(yadif->prev);
+        yadif->prev = NULL;
+        avfilter_start_frame(ctx->outputs[0], yadif->out);
+        return;
+    }
+
     if (!yadif->prev)
         yadif->prev = avfilter_ref_buffer(yadif->cur, AV_PERM_READ);
 
@@ -261,6 +275,12 @@ static void end_frame(AVFilterLink *link)
     if (!yadif->out)
         return;
 
+    if (yadif->auto_enable && !yadif->cur->video->interlaced) {
+        avfilter_draw_slice(ctx->outputs[0], 0, link->h, 1);
+        avfilter_end_frame(ctx->outputs[0]);
+        return;
+    }
+
     return_frame(ctx, 0);
 }
 
@@ -301,6 +321,9 @@ static int poll_frame(AVFilterLink *link)
     }
     assert(yadif->next || !val);
 
+    if (yadif->auto_enable && yadif->next && !yadif->next->video->interlaced)
+        return val;
+
     return val * ((yadif->mode&1)+1);
 }
 
@@ -346,9 +369,10 @@ static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
 
     yadif->mode = 0;
     yadif->parity = -1;
+    yadif->auto_enable = 0;
     yadif->csp = NULL;
 
-    if (args) sscanf(args, "%d:%d", &yadif->mode, &yadif->parity);
+    if (args) sscanf(args, "%d:%d:%d", &yadif->mode, &yadif->parity, &yadif->auto_enable);
 
     yadif->filter_line = filter_line_c;
     if (HAVE_SSSE3 && cpu_flags & AV_CPU_FLAG_SSSE3)
@@ -358,7 +382,7 @@ static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
     else if (HAVE_MMX && cpu_flags & AV_CPU_FLAG_MMX)
         yadif->filter_line = ff_yadif_filter_line_mmx;
 
-    av_log(ctx, AV_LOG_INFO, "mode:%d parity:%d\n", yadif->mode, yadif->parity);
+    av_log(ctx, AV_LOG_INFO, "mode:%d parity:%d auto_enable:%d\n", yadif->mode, yadif->parity, yadif->auto_enable);
 
     return 0;
 }