stereo3d: Support view type for frame sequence type

Implement detection in h264 and hevc and insertion in framepack filter.
Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>

doc/APIchanges

@@ -13,6 +13,9 @@ libavutil:     2017-03-23
 
 API changes, most recent first:
 
+2017-xx-xx - xxxxxxx - lavu 56.7.0 - stereo3d.h
+  Add view field to AVStereo3D structure and AVStereo3DView enum.
+
 2017-xx-xx - xxxxxxx - lavc 58.5.0 - avcodec.h
   Add avcodec_get_hw_frames_parameters().
 

libavcodec/h264_sei.c

@@ -314,10 +314,11 @@ static int decode_frame_packing_arrangement(H264SEIFramePacking *h,
         h->quincunx_subsampling           = get_bits1(gb);
         h->content_interpretation_type    = get_bits(gb, 6);
 
-        // the following skips: spatial_flipping_flag, frame0_flipped_flag,
-        // field_views_flag, current_frame_is_frame0_flag,
+        // spatial_flipping_flag, frame0_flipped_flag, field_views_flag
+        skip_bits(gb, 3);
+        h->current_frame_is_frame0_flag = get_bits1(gb);
         // frame0_self_contained_flag, frame1_self_contained_flag
-        skip_bits(gb, 6);
+        skip_bits(gb, 2);
 
         if (!h->quincunx_subsampling && h->arrangement_type != 5)
             skip_bits(gb, 16);      // frame[01]_grid_position_[xy]

libavcodec/h264_sei.h

@@ -108,6 +108,7 @@ typedef struct H264SEIFramePacking {
     int arrangement_type;
     int content_interpretation_type;
     int quincunx_subsampling;
+    int current_frame_is_frame0_flag;
 } H264SEIFramePacking;
 
 typedef struct H264SEIDisplayOrientation {

libavcodec/h264_slice.c

@@ -1112,6 +1112,13 @@ static int h264_export_frame_props(H264Context *h)
 
         if (fp->content_interpretation_type == 2)
             stereo->flags = AV_STEREO3D_FLAG_INVERT;
+
+        if (fp->arrangement_type == 5) {
+            if (fp->current_frame_is_frame0_flag)
+                stereo->view = AV_STEREO3D_VIEW_LEFT;
+            else
+                stereo->view = AV_STEREO3D_VIEW_RIGHT;
+        }
     }
 
     if (h->sei.display_orientation.present &&

libavcodec/hevc_sei.c

@@ -57,10 +57,11 @@ static int decode_nal_sei_frame_packing_arrangement(HEVCSEIFramePacking *s, GetB
         s->quincunx_subsampling           = get_bits1(gb);
         s->content_interpretation_type    = get_bits(gb, 6);
 
-        // the following skips spatial_flipping_flag frame0_flipped_flag
-        // field_views_flag current_frame_is_frame0_flag
-        // frame0_self_contained_flag frame1_self_contained_flag
-        skip_bits(gb, 6);
+        // spatial_flipping_flag, frame0_flipped_flag, field_views_flag
+        skip_bits(gb, 3);
+        s->current_frame_is_frame0_flag = get_bits1(gb);
+        // frame0_self_contained_flag, frame1_self_contained_flag
+        skip_bits(gb, 2);
 
         if (!s->quincunx_subsampling && s->arrangement_type != 5)
             skip_bits(gb, 16);  // frame[01]_grid_position_[xy]

libavcodec/hevc_sei.h

@@ -67,6 +67,7 @@ typedef struct HEVCSEIFramePacking {
     int arrangement_type;
     int content_interpretation_type;
     int quincunx_subsampling;
+    int current_frame_is_frame0_flag;
 } HEVCSEIFramePacking;
 
 typedef struct HEVCSEIDisplayOrientation {

libavcodec/hevcdec.c

@@ -2397,6 +2397,13 @@ static int set_side_data(HEVCContext *s)
 
         if (s->sei.frame_packing.content_interpretation_type == 2)
             stereo->flags = AV_STEREO3D_FLAG_INVERT;
+
+        if (s->sei.frame_packing.arrangement_type == 5) {
+            if (s->sei.frame_packing.current_frame_is_frame0_flag)
+                stereo->view = AV_STEREO3D_VIEW_LEFT;
+            else
+                stereo->view = AV_STEREO3D_VIEW_RIGHT;
+        }
     }
 
     if (s->sei.display_orientation.present &&

libavfilter/vf_framepack.c

@@ -310,6 +310,8 @@ static int request_frame(AVFilterLink *outlink)
             if (!stereo)
                 return AVERROR(ENOMEM);
             stereo->type = s->format;
+            stereo->view = i == LEFT ? AV_STEREO3D_VIEW_LEFT
+                                     : AV_STEREO3D_VIEW_RIGHT;
 
             // filter the frame and immediately relinquish its pointer
             ret = ff_filter_frame(outlink, s->input_views[i]);

libavutil/stereo3d.h

@@ -141,6 +141,25 @@ enum AVStereo3DType {
     AV_STEREO3D_COLUMNS,
 };
 
+/**
+ * List of possible view types.
+ */
+enum AVStereo3DView {
+    /**
+     * Frame contains two packed views.
+     */
+    AV_STEREO3D_VIEW_PACKED,
+
+    /**
+     * Frame contains only the left view.
+     */
+    AV_STEREO3D_VIEW_LEFT,
+
+    /**
+     * Frame contains only the right view.
+     */
+    AV_STEREO3D_VIEW_RIGHT,
+};
 
 /**
  * Inverted views, Right/Bottom represents the left view.
@@ -164,6 +183,11 @@ typedef struct AVStereo3D {
      * Additional information about the frame packing.
      */
     int flags;
+
+    /**
+     * Determines which views are packed.
+     */
+    enum AVStereo3DView view;
 } AVStereo3D;
 
 /**

libavutil/version.h

@@ -54,7 +54,7 @@
  */
 
 #define LIBAVUTIL_VERSION_MAJOR 56
-#define LIBAVUTIL_VERSION_MINOR  6
+#define LIBAVUTIL_VERSION_MINOR  7
 #define LIBAVUTIL_VERSION_MICRO  0
 
 #define LIBAVUTIL_VERSION_INT   AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \