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>

1 files changed, 47 insertions, 0 deletions

diff --git a/libavutil/hdr_dynamic_metadata.c b/libavutil/hdr_dynamic_metadata.c
new file mode 100644
index 0000000000..0fa1ee82de
--- /dev/null
+++ b/libavutil/hdr_dynamic_metadata.c
@@ -0,0 +1,47 @@
+/**
+ * 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;
+}