lavf/showinfo: support mastering display sidedata

support mastering display sidedata.
Signed-off-by: Jun Zhao <barryjzhao@tencent.com>

libavfilter/vf_showinfo.c

@@ -34,6 +34,7 @@
 #include "libavutil/stereo3d.h"
 #include "libavutil/timestamp.h"
 #include "libavutil/timecode.h"
+#include "libavutil/mastering_display_metadata.h"
 
 #include "avfilter.h"
 #include "internal.h"
@@ -133,6 +134,32 @@ static void dump_roi(AVFilterContext *ctx, AVFrameSideData *sd)
     }
 }
 
+static void dump_mastering_display(AVFilterContext *ctx, AVFrameSideData *sd)
+{
+    AVMasteringDisplayMetadata *mastering_display;
+
+    av_log(ctx, AV_LOG_INFO, "mastering display: ");
+    if (sd->size < sizeof(*mastering_display)) {
+        av_log(ctx, AV_LOG_ERROR, "invalid data");
+        return;
+    }
+
+    mastering_display = (AVMasteringDisplayMetadata *)sd->data;
+
+    av_log(ctx, AV_LOG_INFO, "has_primaries:%d has_luminance:%d "
+           "r(%5.4f,%5.4f) g(%5.4f,%5.4f) b(%5.4f %5.4f) wp(%5.4f, %5.4f) "
+           "min_luminance=%f, max_luminance=%f",
+           mastering_display->has_primaries, mastering_display->has_luminance,
+           av_q2d(mastering_display->display_primaries[0][0]),
+           av_q2d(mastering_display->display_primaries[0][1]),
+           av_q2d(mastering_display->display_primaries[1][0]),
+           av_q2d(mastering_display->display_primaries[1][1]),
+           av_q2d(mastering_display->display_primaries[2][0]),
+           av_q2d(mastering_display->display_primaries[2][1]),
+           av_q2d(mastering_display->white_point[0]), av_q2d(mastering_display->white_point[1]),
+           av_q2d(mastering_display->min_luminance), av_q2d(mastering_display->max_luminance));
+}
+
 static void dump_color_property(AVFilterContext *ctx, AVFrame *frame)
 {
     const char *color_range_str     = av_color_range_name(frame->color_range);
@@ -271,6 +298,9 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
         case AV_FRAME_DATA_REGIONS_OF_INTEREST:
             dump_roi(ctx, sd);
             break;
+        case AV_FRAME_DATA_MASTERING_DISPLAY_METADATA:
+            dump_mastering_display(ctx, sd);
+            break;
         default:
             av_log(ctx, AV_LOG_WARNING, "unknown side data type %d (%d bytes)",
                    sd->type, sd->size);