Add HDR dynamic metadata struct (for SMPTE 2094-40) to libavutil

The dynamic metadata contains data for color volume transform -
application 4 of SMPTE 2094-40:2016 standard. The data comes from
HEVC in the SEI_TYPE_USER_DATA_REGISTERED_ITU_T_T35.
Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>

libavutil/Makefile

@@ -31,6 +31,7 @@ HEADERS = adler32.h                                                     \
           file.h                                                        \
           frame.h                                                       \
           hash.h                                                        \
+          hdr_dynamic_metadata.h                                        \
           hmac.h                                                        \
           hwcontext.h                                                   \
           hwcontext_cuda.h                                              \
@@ -119,6 +120,7 @@ OBJS = adler32.o                                                        \
        fixed_dsp.o                                                      \
        frame.o                                                          \
        hash.o                                                           \
+       hdr_dynamic_metadata.o                                           \
        hmac.o                                                           \
        hwcontext.o                                                      \
        imgutils.o                                                       \

libavutil/frame.c

@@ -840,6 +840,7 @@ const char *av_frame_side_data_name(enum AVFrameSideDataType type)
     case AV_FRAME_DATA_QP_TABLE_PROPERTIES:         return "QP table properties";
     case AV_FRAME_DATA_QP_TABLE_DATA:               return "QP table data";
 #endif
+    case AV_FRAME_DATA_DYNAMIC_HDR_PLUS: return "HDR Dynamic Metadata SMPTE2094-40 (HDR10+)";
     }
     return NULL;
 }

libavutil/frame.h

@@ -166,6 +166,13 @@ enum AVFrameSideDataType {
      * function in libavutil/timecode.c.
      */
     AV_FRAME_DATA_S12M_TIMECODE,
+
+    /**
+     * HDR dynamic metadata associated with a video frame. The payload is
+     * an AVDynamicHDRPlus type and contains information for color
+     * volume transform - application 4 of SMPTE 2094-40:2016 standard.
+     */
+    AV_FRAME_DATA_DYNAMIC_HDR_PLUS,
 };
 
 enum AVActiveFormatDescription {

libavutil/hdr_dynamic_metadata.c

+/**
+ * Copyright (c) 2018 Mohammad Izadi <moh.izadi at gmail.com>
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "hdr_dynamic_metadata.h"
+#include "mem.h"
+
+AVDynamicHDRPlus *av_dynamic_hdr_plus_alloc(size_t *size)
+{
+    AVDynamicHDRPlus *hdr_plus = av_mallocz(sizeof(AVDynamicHDRPlus));
+    if (!hdr_plus)
+        return NULL;
+
+    if (size)
+        *size = sizeof(*hdr_plus);
+
+    return hdr_plus;
+}
+
+AVDynamicHDRPlus *av_dynamic_hdr_plus_create_side_data(AVFrame *frame)
+{
+    AVFrameSideData *side_data = av_frame_new_side_data(frame,
+                                                        AV_FRAME_DATA_DYNAMIC_HDR_PLUS,
+                                                        sizeof(AVDynamicHDRPlus));
+    if (!side_data)
+        return NULL;
+
+    memset(side_data->data, 0, sizeof(AVDynamicHDRPlus));
+
+    return (AVDynamicHDRPlus *)side_data->data;
+}

libavutil/version.h

@@ -79,8 +79,8 @@
  */
 
 #define LIBAVUTIL_VERSION_MAJOR  56
-#define LIBAVUTIL_VERSION_MINOR  24
-#define LIBAVUTIL_VERSION_MICRO 101
+#define LIBAVUTIL_VERSION_MINOR  25
+#define LIBAVUTIL_VERSION_MICRO 100
 
 #define LIBAVUTIL_VERSION_INT   AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \
                                                LIBAVUTIL_VERSION_MINOR, \