1 // Copyright 2013 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_MP2T_TS_PACKET_H_ 6 #define MEDIA_MP2T_TS_PACKET_H_ 7 8 #include "base/basictypes.h" 9 10 namespace media { 11 12 class BitReader; 13 14 namespace mp2t { 15 16 class TsPacket { 17 public: 18 static const int kPacketSize = 188; 19 20 // Return the number of bytes to discard 21 // to be synchronized on a TS syncword. 22 static int Sync(const uint8* buf, int size); 23 24 // Parse a TS packet. 25 // Return a TsPacket only when parsing was successful. 26 // Return NULL otherwise. 27 static TsPacket* Parse(const uint8* buf, int size); 28 29 ~TsPacket(); 30 31 // TS header accessors. 32 bool payload_unit_start_indicator() const { 33 return payload_unit_start_indicator_; 34 } 35 int pid() const { return pid_; } 36 int continuity_counter() const { return continuity_counter_; } 37 bool discontinuity_indicator() const { return discontinuity_indicator_; } 38 bool random_access_indicator() const { return random_access_indicator_; } 39 40 // Return the offset and the size of the payload. 41 const uint8* payload() const { return payload_; } 42 int payload_size() const { return payload_size_; } 43 44 private: 45 TsPacket(); 46 47 // Parse an Mpeg2 TS header. 48 // The buffer size should be at least |kPacketSize| 49 bool ParseHeader(const uint8* buf); 50 bool ParseAdaptationField(BitReader* bit_reader, 51 int adaptation_field_length); 52 53 // Size of the payload. 54 const uint8* payload_; 55 int payload_size_; 56 57 // TS header. 58 bool payload_unit_start_indicator_; 59 int pid_; 60 int continuity_counter_; 61 62 // Params from the adaptation field. 63 bool discontinuity_indicator_; 64 bool random_access_indicator_; 65 66 DISALLOW_COPY_AND_ASSIGN(TsPacket); 67 }; 68 69 } // namespace mp2t 70 } // namespace media 71 72 #endif 73 74
