h264: parse display orientation SEI message

Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>

1 files changed, 22 insertions, 0 deletions

diff --git a/libavcodec/h264_sei.c b/libavcodec/h264_sei.c
index 6fca2c32a9..33230b7dfa 100644
--- a/libavcodec/h264_sei.c
+++ b/libavcodec/h264_sei.c
@@ -41,6 +41,7 @@ void ff_h264_reset_sei(H264Context *h)
     h->sei_cpb_removal_delay        = -1;
     h->sei_buffering_period_present =  0;
     h->sei_frame_packing_present    =  0;
+    h->sei_display_orientation_present = 0;
 }
 
 static int decode_picture_timing(H264Context *h)
@@ -199,6 +200,22 @@ static int decode_frame_packing_arrangement(H264Context *h)
     return 0;
 }
 
+static int decode_display_orientation(H264Context *h)
+{
+    h->sei_display_orientation_present = !get_bits1(&h->gb);
+
+    if (h->sei_display_orientation_present) {
+        h->sei_hflip = get_bits1(&h->gb);     // hor_flip
+        h->sei_vflip = get_bits1(&h->gb);     // ver_flip
+
+        h->sei_anticlockwise_rotation = get_bits(&h->gb, 16);
+        get_ue_golomb(&h->gb);  // display_orientation_repetition_period
+        skip_bits1(&h->gb);     // display_orientation_extension_flag
+    }
+
+    return 0;
+}
+
 int ff_h264_decode_sei(H264Context *h)
 {
     while (get_bits_left(&h->gb) > 16) {
@@ -246,6 +263,11 @@ int ff_h264_decode_sei(H264Context *h)
             if (ret < 0)
                 return ret;
             break;
+        case SEI_TYPE_DISPLAY_ORIENTATION:
+            ret = decode_display_orientation(h);
+            if (ret < 0)
+                return ret;
+            break;
         default:
             av_log(h->avctx, AV_LOG_DEBUG, "unknown SEI type %d\n", type);
             skip_bits(&h->gb, 8 * size);