1 // Copyright 2014 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef MEDIA_FORMATS_WEBM_WEBM_WEBVTT_PARSER_H_ 6 #define MEDIA_FORMATS_WEBM_WEBM_WEBVTT_PARSER_H_ 7 8 #include <string> 9 10 #include "base/basictypes.h" 11 #include "media/base/media_export.h" 12 13 namespace media { 14 15 class MEDIA_EXPORT WebMWebVTTParser { 16 public: 17 // Utility function to parse the WebVTT cue from a byte stream. 18 static void Parse(const uint8* payload, int payload_size, 19 std::string* id, 20 std::string* settings, 21 std::string* content); 22 23 private: 24 // The payload is the embedded WebVTT cue, stored in a WebM block. 25 // The parser treats this as a UTF-8 byte stream. 26 WebMWebVTTParser(const uint8* payload, int payload_size); 27 28 // Parse the cue identifier, settings, and content from the stream. 29 void Parse(std::string* id, std::string* settings, std::string* content); 30 // Remove a byte from the stream, advancing the stream pointer. 31 // Returns true if a character was returned; false means "end of stream". 32 bool GetByte(uint8* byte); 33 34 // Backup the stream pointer. 35 void UngetByte(); 36 37 // Parse a line of text from the stream. 38 void ParseLine(std::string* line); 39 40 // Represents the portion of the stream that has not been consumed yet. 41 const uint8* ptr_; 42 const uint8* const ptr_end_; 43 44 DISALLOW_COPY_AND_ASSIGN(WebMWebVTTParser); 45 }; 46 47 } // namespace media 48 49 #endif // MEDIA_FORMATS_WEBM_WEBM_WEBVTT_PARSER_H_ 50
