media/webm/webm_tracks_parser.h

// Copyright (c) 2011 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_TRACKS_PARSER_H_
#define MEDIA_WEBM_WEBM_TRACKS_PARSER_H_

#include "media/webm/webm_parser.h"

#include "base/time.h"

namespace media {

// Parser for WebM Tracks element.
class WebMTracksParser : public WebMParserClient {
 public:
  WebMTracksParser(int64 timecode_scale);
  virtual ~WebMTracksParser();

  // 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* buf, int size);

  int64 audio_track_num() const { return audio_track_num_; }
  base::TimeDelta audio_default_duration() const {
    return audio_default_duration_;
  }

  int64 video_track_num() const { return video_track_num_; }
  base::TimeDelta video_default_duration() const {
    return video_default_duration_;
  }

 private:
  // WebMParserClient methods
  virtual bool OnListStart(int id);
  virtual bool OnListEnd(int id);
  virtual bool OnUInt(int id, int64 val);
  virtual bool OnFloat(int id, double val);
  virtual bool OnBinary(int id, const uint8* data, int size);
  virtual bool OnString(int id, const std::string& str);
  virtual bool OnSimpleBlock(int track_num, int timecode, int flags,
                             const uint8* data, int size);
  int64 timecode_scale_;

  int64 track_type_;
  int64 track_num_;
  int64 track_default_duration_;
  int64 audio_track_num_;
  base::TimeDelta audio_default_duration_;
  int64 video_track_num_;
  base::TimeDelta video_default_duration_;

  DISALLOW_IMPLICIT_CONSTRUCTORS(WebMTracksParser);
};

}  // namespace media

#endif  // MEDIA_WEBM_WEBM_TRACKS_PARSER_H_