From acb77dff6af036192f6064c84f9cccc48582989e Mon Sep 17 00:00:00 2001
From: Vittorio Giovara <vittorio.giovara@gmail.com>
Date: Sun, 10 Nov 2013 23:23:57 +0100
Subject: [PATCH] hevc: parse frame packing arrangement SEI messages and save
 relevant stereo3d information

---
 libavcodec/hevc.c     | 40 ++++++++++++++++++++++++++++++++++++++++
 libavcodec/hevc.h     |  6 ++++++
 libavcodec/hevc_sei.c | 15 ++++++++++-----
 3 files changed, 56 insertions(+), 5 deletions(-)

diff --git a/libavcodec/hevc.c b/libavcodec/hevc.c
index f00667c6ff..6b935b6dba 100644
--- a/libavcodec/hevc.c
+++ b/libavcodec/hevc.c
@@ -29,6 +29,7 @@
 #include "libavutil/md5.h"
 #include "libavutil/opt.h"
 #include "libavutil/pixdesc.h"
+#include "libavutil/stereo3d.h"
 
 #include "bytestream.h"
 #include "cabac_functions.h"
@@ -2347,6 +2348,41 @@ static void restore_tqb_pixels(HEVCContext *s)
     }
 }
 
+static int set_side_data(HEVCContext *s)
+{
+    AVFrame *out = s->ref->frame;
+
+    if (s->sei_frame_packing_present &&
+        s->frame_packing_arrangement_type >= 3 &&
+        s->frame_packing_arrangement_type <= 5 &&
+        s->content_interpretation_type > 0 &&
+        s->content_interpretation_type < 3) {
+        AVStereo3D *stereo = av_stereo3d_create_side_data(out);
+        if (!stereo)
+            return AVERROR(ENOMEM);
+
+        switch (s->frame_packing_arrangement_type) {
+        case 3:
+            if (s->quincunx_subsampling)
+                stereo->type = AV_STEREO3D_SIDEBYSIDE_QUINCUNX;
+            else
+                stereo->type = AV_STEREO3D_SIDEBYSIDE;
+            break;
+        case 4:
+            stereo->type = AV_STEREO3D_TOPBOTTOM;
+            break;
+        case 5:
+            stereo->type = AV_STEREO3D_FRAMESEQUENCE;
+            break;
+        }
+
+        if (s->content_interpretation_type == 2)
+            stereo->flags = AV_STEREO3D_FLAG_INVERT;
+    }
+
+    return 0;
+}
+
 static int hevc_frame_start(HEVCContext *s)
 {
     HEVCLocalContext *lc = &s->HEVClc;
@@ -2381,6 +2417,10 @@ static int hevc_frame_start(HEVCContext *s)
         goto fail;
     }
 
+    ret = set_side_data(s);
+    if (ret < 0)
+        goto fail;
+
     av_frame_unref(s->output_frame);
     ret = ff_hevc_output_frame(s, s->output_frame, 0);
     if (ret < 0)
diff --git a/libavcodec/hevc.h b/libavcodec/hevc.h
index ab95035dda..d19f3122f5 100644
--- a/libavcodec/hevc.h
+++ b/libavcodec/hevc.h
@@ -920,6 +920,12 @@ typedef struct HEVCContext {
 
     int nal_length_size;    ///< Number of bytes used for nal length (1, 2 or 4)
     int nuh_layer_id;
+
+    /** frame packing arrangement variables */
+    int sei_frame_packing_present;
+    int frame_packing_arrangement_type;
+    int content_interpretation_type;
+    int quincunx_subsampling;
 } HEVCContext;
 
 int ff_hevc_decode_short_term_rps(HEVCContext *s, ShortTermRPS *rps,
diff --git a/libavcodec/hevc_sei.c b/libavcodec/hevc_sei.c
index 1cf698bd9d..eed7b335f8 100644
--- a/libavcodec/hevc_sei.c
+++ b/libavcodec/hevc_sei.c
@@ -46,17 +46,17 @@ static void decode_nal_sei_decoded_picture_hash(HEVCContext *s)
     }
 }
 
-static void decode_nal_sei_frame_packing_arrangement(HEVCLocalContext *lc)
+static void decode_nal_sei_frame_packing_arrangement(HEVCContext *s)
 {
-    GetBitContext *gb = &lc->gb;
-    int cancel, type, quincunx;
+    GetBitContext *gb = &s->HEVClc.gb;
+    int cancel, type, quincunx, content;
 
     get_ue_golomb(gb);                  // frame_packing_arrangement_id
     cancel = get_bits1(gb);             // frame_packing_cancel_flag
     if (cancel == 0) {
         type     = get_bits(gb, 7);     // frame_packing_arrangement_type
         quincunx = get_bits1(gb);       // quincunx_sampling_flag
-        skip_bits(gb, 6);               // content_interpretation_type
+        content  = get_bits(gb, 6);     // content_interpretation_type
 
         // the following skips spatial_flipping_flag frame0_flipped_flag
         // field_views_flag current_frame_is_frame0_flag
@@ -69,6 +69,11 @@ static void decode_nal_sei_frame_packing_arrangement(HEVCLocalContext *lc)
         skip_bits1(gb);         // frame_packing_arrangement_persistance_flag
     }
     skip_bits1(gb);             // upsampled_aspect_ratio_flag
+
+    s->sei_frame_packing_present      = (cancel == 0);
+    s->frame_packing_arrangement_type = type;
+    s->content_interpretation_type    = content;
+    s->quincunx_subsampling           = quincunx;
 }
 
 static int decode_nal_sei_message(HEVCContext *s)
@@ -93,7 +98,7 @@ static int decode_nal_sei_message(HEVCContext *s)
         if (payload_type == 256)
             decode_nal_sei_decoded_picture_hash(s);
         else if (payload_type == 45)
-            decode_nal_sei_frame_packing_arrangement(&s->HEVClc);
+            decode_nal_sei_frame_packing_arrangement(s);
         else {
             av_log(s->avctx, AV_LOG_DEBUG, "Skipped PREFIX SEI %d\n", payload_type);
             skip_bits(gb, 8 * payload_size);
-- 
2.11.0