rotation: fix build with ffmpeg < 4.0

Change-Id: I975fb3844b135c7eb15357558e52f9bbfee13237

src/media/libav_deps.h

@@ -39,6 +39,11 @@ extern "C" {
 #include <libavutil/intreadwrite.h>
 #include <libavutil/log.h>
 #include <libavutil/samplefmt.h>
+
+#if LIBAVUTIL_VERSION_MAJOR < 56
+AVFrameSideData*
+av_frame_new_side_data_from_buf(AVFrame* frame, enum AVFrameSideDataType type, AVBufferRef* buf);
+#endif
 }
 
 #include "libav_utils.h"

src/media/libav_utils.cpp

@@ -23,7 +23,9 @@
 
 #include "libav_deps.h" // MUST BE INCLUDED FIRST
 
+#ifdef HAVE_CONFIG_H
 #include "config.h"
+#endif
 #include "video/video_base.h"
 #include "logger.h"
 
@@ -36,6 +38,20 @@
 #include <exception>
 #include <ciso646> // fix windows compiler bug
 
+extern "C" {
+#if LIBAVUTIL_VERSION_MAJOR < 56
+AVFrameSideData*
+av_frame_new_side_data_from_buf(AVFrame* frame, enum AVFrameSideDataType type, AVBufferRef* buf)
+{
+    auto side_data = av_frame_new_side_data(frame, type, 0);
+    av_buffer_unref(&side_data->buf);
+    side_data->buf = buf;
+    side_data->data = side_data->buf->data;
+    side_data->size = side_data->buf->size;
+}
+#endif
+}
+
 namespace ring { namespace libav_utils {
 
 #if LIBAVCODEC_VERSION_INT < AV_VERSION_INT(58, 9, 100)