text: // Copyright 2014 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_TRACKS_PARSER_H_
  #define MEDIA_FORMATS_WEBM_WEBM_TRACKS_PARSER_H_
  
  #include <stdint.h>
  
  #include <map>
  #include <set>
  #include <string>
  #include <vector>
  
  #include "base/compiler_specific.h"
  #include "base/macros.h"
  #include "base/memory/scoped_ptr.h"
  #include "base/time/time.h"
  #include "media/base/audio_decoder_config.h"
  #include "media/base/media_log.h"
  #include "media/base/text_track_config.h"
  #include "media/base/video_decoder_config.h"
  #include "media/formats/webm/webm_audio_client.h"
  #include "media/formats/webm/webm_content_encodings_client.h"
  #include "media/formats/webm/webm_parser.h"
  #include "media/formats/webm/webm_video_client.h"
  
  namespace media {
  
  // Parser for WebM Tracks element.
  class MEDIA_EXPORT WebMTracksParser : public WebMParserClient {
   public:
    WebMTracksParser(const scoped_refptr<MediaLog>& media_log,
                     bool ignore_text_tracks);
    ~WebMTracksParser() override;
  
    // Parses a WebM Tracks element in |buf|.
    //
    // Returns -1 if the parse fails.
    // Returns 0 if more data is needed.
    // Returns the number of bytes parsed on success.
    int Parse(const uint8_t* buf, int size);
  
    int64_t audio_track_num() const { return audio_track_num_; }
    int64_t video_track_num() const { return video_track_num_; }
  
    // If TrackEntry DefaultDuration field existed for the associated audio or
    // video track, returns that value converted from ns to base::TimeDelta with
    // precision not greater than |timecode_scale_in_us|. Defaults to
    // kNoTimestamp().
    base::TimeDelta GetAudioDefaultDuration(
        const double timecode_scale_in_us) const;
    base::TimeDelta GetVideoDefaultDuration(
        const double timecode_scale_in_us) const;
  
    const std::set<int64_t>& ignored_tracks() const { return ignored_tracks_; }
  
    const std::string& audio_encryption_key_id() const {
      return audio_encryption_key_id_;
    }
  
    const AudioDecoderConfig& audio_decoder_config() {
      return audio_decoder_config_;
    }
  
    const std::string& video_encryption_key_id() const {
      return video_encryption_key_id_;
    }
  
    const VideoDecoderConfig& video_decoder_config() {
      return video_decoder_config_;
    }
  
    typedef std::map<int, TextTrackConfig> TextTracks;
  
    const TextTracks& text_tracks() const {
      return text_tracks_;
    }
  
   private:
    // WebMParserClient implementation.
    WebMParserClient* OnListStart(int id) override;
    bool OnListEnd(int id) override;
    bool OnUInt(int id, int64_t val) override;
    bool OnFloat(int id, double val) override;
    bool OnBinary(int id, const uint8_t* data, int size) override;
    bool OnString(int id, const std::string& str) override;
  
    int64_t track_type_;
    int64_t track_num_;
    std::string track_name_;
    std::string track_language_;
    std::string codec_id_;
    std::vector<uint8_t> codec_private_;
    int64_t seek_preroll_;
    int64_t codec_delay_;
    int64_t default_duration_;
    scoped_ptr<WebMContentEncodingsClient> track_content_encodings_client_;
  
    int64_t audio_track_num_;
    int64_t audio_default_duration_;
    int64_t video_track_num_;
    int64_t video_default_duration_;
    bool ignore_text_tracks_;
    TextTracks text_tracks_;
    std::set<int64_t> ignored_tracks_;
    std::string audio_encryption_key_id_;
    std::string video_encryption_key_id_;
    scoped_refptr<MediaLog> media_log_;
  
    WebMAudioClient audio_client_;
    AudioDecoderConfig audio_decoder_config_;
  
    WebMVideoClient video_client_;
    VideoDecoderConfig video_decoder_config_;
  
    DISALLOW_COPY_AND_ASSIGN(WebMTracksParser);
  };
  
  }  // namespace media
  
  #endif  // MEDIA_FORMATS_WEBM_WEBM_TRACKS_PARSER_H_
  