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+/*
+ *  Copyright (c) 2018 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef API_VIDEO_HDR_METADATA_H_
+#define API_VIDEO_HDR_METADATA_H_
+
+namespace webrtc {
+
+// SMPTE ST 2086 mastering metadata,
+// see https://ieeexplore.ieee.org/document/8353899.
+struct HdrMasteringMetadata {
+  struct Chromaticity {
+    Chromaticity();
+
+    bool operator==(const Chromaticity& rhs) const {
+      return x == rhs.x && y == rhs.y;
+    }
+
+    bool Validate() const {
+      return x >= 0.0 && x <= 1.0 && y >= 0.0 && y <= 1.0;
+    }
+
+    // xy chromaticity coordinates must be calculated as specified in ISO
+    // 11664-3:2012 Section 7, and must be specified with four decimal places.
+    // The x coordinate should be in the range [0.0001, 0.7400] and the y
+    // coordinate should be in the range [0.0001, 0.8400]. Valid range [0.0000,
+    // 1.0000].
+    float x = 0.0f;
+    float y = 0.0f;
+  };
+
+  HdrMasteringMetadata();
+
+  bool operator==(const HdrMasteringMetadata& rhs) const {
+    return ((primary_r == rhs.primary_r) && (primary_g == rhs.primary_g) &&
+            (primary_b == rhs.primary_b) && (white_point == rhs.white_point) &&
+            (luminance_max == rhs.luminance_max) &&
+            (luminance_min == rhs.luminance_min));
+  }
+
+  bool Validate() const {
+    return luminance_max >= 0.0 && luminance_max <= 20000.0 &&
+           luminance_min >= 0.0 && luminance_min <= 5.0 &&
+           primary_r.Validate() && primary_g.Validate() &&
+           primary_b.Validate() && white_point.Validate();
+  }
+
+  // The nominal primaries of the mastering display.
+  Chromaticity primary_r;
+  Chromaticity primary_g;
+  Chromaticity primary_b;
+
+  // The nominal chromaticity of the white point of the mastering display.
+  Chromaticity white_point;
+
+  // The nominal maximum display luminance of the mastering display. Specified
+  // in the unit candela/m2. The value should be in the range [5, 10000] with
+  // zero decimal places. Valid range [0, 20000].
+  float luminance_max = 0.0f;
+
+  // The nominal minimum display luminance of the mastering display. Specified
+  // in the unit candela/m2. The value should be in the range [0.0001, 5.0000]
+  // with four decimal places. Valid range [0.0000, 5.0000].
+  float luminance_min = 0.0f;
+};
+
+// High dynamic range (HDR) metadata common for HDR10 and WebM/VP9-based HDR
+// formats. This struct replicates the HDRMetadata struct defined in
+// https://cs.chromium.org/chromium/src/media/base/hdr_metadata.h
+struct HdrMetadata {
+  HdrMetadata();
+
+  bool operator==(const HdrMetadata& rhs) const {
+    return (
+        (max_content_light_level == rhs.max_content_light_level) &&
+        (max_frame_average_light_level == rhs.max_frame_average_light_level) &&
+        (mastering_metadata == rhs.mastering_metadata));
+  }
+
+  bool Validate() const {
+    return max_content_light_level >= 0 && max_content_light_level <= 20000 &&
+           max_frame_average_light_level >= 0 &&
+           max_frame_average_light_level <= 20000 &&
+           mastering_metadata.Validate();
+  }
+
+  HdrMasteringMetadata mastering_metadata;
+  // Max content light level (CLL), i.e. maximum brightness level present in the
+  // stream, in nits. 1 nit = 1 candela/m2. Valid range [0, 20000].
+  int max_content_light_level = 0;
+  // Max frame-average light level (FALL), i.e. maximum average brightness of
+  // the brightest frame in the stream, in nits. Valid range [0, 20000].
+  int max_frame_average_light_level = 0;
+};
+
+}  // namespace webrtc
+
+#endif  // API_VIDEO_HDR_METADATA_H_