text: // Copyright (c) 2013 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_WEBM_WEBM_VIDEO_CLIENT_H_
  #define MEDIA_WEBM_WEBM_VIDEO_CLIENT_H_
  
  #include <string>
  #include <vector>
  
  #include "media/base/media_log.h"
  #include "media/webm/webm_parser.h"
  
  namespace media {
  class VideoDecoderConfig;
  
  // Helper class used to parse a Video element inside a TrackEntry element.
  class WebMVideoClient : public WebMParserClient {
   public:
    explicit WebMVideoClient(const LogCB& log_cb);
    virtual ~WebMVideoClient();
  
    // Reset this object's state so it can process a new video track element.
    void Reset();
  
    // Initialize |config| with the data in |codec_id|, |codec_private|,
    // |is_encrypted| and the fields parsed from the last video track element this
    // object was used to parse.
    // Returns true if |config| was successfully initialized.
    // Returns false if there was unexpected values in the provided parameters or
    // video track element fields. The contents of |config| are undefined in this
    // case and should not be relied upon.
    bool InitializeConfig(const std::string& codec_id,
                          const std::vector<uint8>& codec_private,
                          bool is_encrypted,
                          VideoDecoderConfig* config);
  
   private:
    // WebMParserClient implementation.
    virtual bool OnUInt(int id, int64 val) OVERRIDE;
    virtual bool OnBinary(int id, const uint8* data, int size) OVERRIDE;
    virtual bool OnFloat(int id, double val) OVERRIDE;
  
    LogCB log_cb_;
    int64 pixel_width_;
    int64 pixel_height_;
    int64 crop_bottom_;
    int64 crop_top_;
    int64 crop_left_;
    int64 crop_right_;
    int64 display_width_;
    int64 display_height_;
    int64 display_unit_;
    int64 alpha_mode_;
  
    DISALLOW_COPY_AND_ASSIGN(WebMVideoClient);
  };
  
  }  // namespace media
  
  #endif  // MEDIA_WEBM_WEBM_VIDEO_CLIENT_H_
  