ts_packet.h

// 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 PACKAGER_MEDIA_FORMATS_MP2T_TS_PACKET_H_
#define PACKAGER_MEDIA_FORMATS_MP2T_TS_PACKET_H_
 
#include <cstdint>
 
#include <packager/macros/classes.h>
 
namespace shaka {
namespace media {
 
class BitReader;
 
namespace mp2t {
 
class TsPacket {
 public:
  static const int kPacketSize = 188;
 
  // Return the number of bytes to discard
  // to be synchronized on a TS syncword.
  static int Sync(const uint8_t* buf, int size);
 
  // Parse a TS packet.
  // Return a TsPacket only when parsing was successful.
  // Return NULL otherwise.
  static TsPacket* Parse(const uint8_t* buf, int size);
 
  ~TsPacket();
 
  // TS header accessors.
  bool payload_unit_start_indicator() const {
    return payload_unit_start_indicator_;
  }
  int pid() const { return pid_; }
  int continuity_counter() const { return continuity_counter_; }
  bool discontinuity_indicator() const { return discontinuity_indicator_; }
  bool random_access_indicator() const { return random_access_indicator_; }
 
  // Return the offset and the size of the payload.
  const uint8_t* payload() const { return payload_; }
  int payload_size() const { return payload_size_; }
 
 private:
  TsPacket();
 
  // Parse an Mpeg2 TS header.
  // The buffer size should be at least |kPacketSize|
  bool ParseHeader(const uint8_t* buf);
  bool ParseAdaptationField(BitReader* bit_reader,
                            int adaptation_field_length);
 
  // Size of the payload.
  const uint8_t* payload_;
  int payload_size_;
 
  // TS header.
  bool payload_unit_start_indicator_;
  int pid_;
  int continuity_counter_;
 
  // Params from the adaptation field.
  bool discontinuity_indicator_;
  bool random_access_indicator_;
 
  DISALLOW_COPY_AND_ASSIGN(TsPacket);
};
 
}  // namespace mp2t
}  // namespace media
}  // namespace shaka
 
#endif