media/formats/webm/webm_colour_parser.h

// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef MEDIA_FORMATS_WEBM_WEBM_COLOUR_PARSER_H_
#define MEDIA_FORMATS_WEBM_WEBM_COLOUR_PARSER_H_

#include "base/macros.h"
#include "media/base/hdr_metadata.h"
#include "media/base/video_color_space.h"
#include "media/formats/webm/webm_parser.h"

namespace media {

// WebM color information, containing HDR metadata:
// http://www.webmproject.org/docs/container/#Colour
struct MEDIA_EXPORT WebMColorMetadata {
  unsigned BitsPerChannel = 0;
  unsigned ChromaSubsamplingHorz = 0;
  unsigned ChromaSubsamplingVert = 0;
  unsigned CbSubsamplingHorz = 0;
  unsigned CbSubsamplingVert = 0;
  unsigned ChromaSitingHorz = 0;
  unsigned ChromaSitingVert = 0;

  VideoColorSpace color_space;

  HDRMetadata hdr_metadata;

  WebMColorMetadata();
  WebMColorMetadata(const WebMColorMetadata& rhs);
};

// Parser for WebM MasteringMetadata within Colour element:
// http://www.webmproject.org/docs/container/#MasteringMetadata
class WebMMasteringMetadataParser : public WebMParserClient {
 public:
  WebMMasteringMetadataParser();
  ~WebMMasteringMetadataParser() override;

  MasteringMetadata GetMasteringMetadata() const { return mastering_metadata_; }

 private:
  // WebMParserClient implementation.
  bool OnFloat(int id, double val) override;

  MasteringMetadata mastering_metadata_;
  DISALLOW_COPY_AND_ASSIGN(WebMMasteringMetadataParser);
};

// Parser for WebM Colour element:
// http://www.webmproject.org/docs/container/#colour
class WebMColourParser : public WebMParserClient {
 public:
  WebMColourParser();
  ~WebMColourParser() override;

  void Reset();

  WebMColorMetadata GetWebMColorMetadata() const;

 private:
  // WebMParserClient implementation.
  WebMParserClient* OnListStart(int id) override;
  bool OnListEnd(int id) override;
  bool OnUInt(int id, int64_t val) override;

  int64_t matrix_coefficients_;
  int64_t bits_per_channel_;
  int64_t chroma_subsampling_horz_;
  int64_t chroma_subsampling_vert_;
  int64_t cb_subsampling_horz_;
  int64_t cb_subsampling_vert_;
  int64_t chroma_siting_horz_;
  int64_t chroma_siting_vert_;
  int64_t range_;
  int64_t transfer_characteristics_;
  int64_t primaries_;
  int64_t max_content_light_level_;
  int64_t max_frame_average_light_level_;

  WebMMasteringMetadataParser mastering_metadata_parser_;
  bool mastering_metadata_parsed_ = false;

  DISALLOW_COPY_AND_ASSIGN(WebMColourParser);
};

}  // namespace media

#endif  // MEDIA_FORMATS_WEBM_WEBM_COLOUR_PARSER_H_