/// \file ts_packet.h
/// Holds all headers for the TS Namespace.

#pragma once
#include <string>
#include <cmath>
#include <stdint.h>//for uint64_t
#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <algorithm>

#include "dtsc.h"

/// Holds all TS processing related code.
namespace TS {
  /// Class for reading and writing TS Streams
  class Packet{
    public:
      Packet();
      ~Packet();
      bool FromString(std::string & Data);
      void PID(int NewPID);
      int PID();
      void ContinuityCounter(int NewContinuity);
      int ContinuityCounter();
      void Clear();
      void PCR(int64_t NewVal);
      int64_t PCR();
      void AdaptationField(int NewVal);
      int AdaptationField();
      int AdaptationFieldLen();
      void DefaultPAT();
      void DefaultPMT();
      int UnitStart();
      void UnitStart(int NewVal);
      int RandomAccess();
      void RandomAccess(int NewVal);
      int BytesFree();

      std::string toPrettyString(size_t indent = 0);
      const char* ToString();
      void PESVideoLeadIn(unsigned int NewLen, long long unsigned int PTS = 1);
      void PESAudioLeadIn(unsigned int NewLen, uint64_t PTS = 0);
      static void PESAudioLeadIn(std::string & toSend, long long unsigned int PTS);
      static void PESVideoLeadIn(std::string & toSend, long long unsigned int PTS);
      static std::string & getPESAudioLeadIn(unsigned int NewLen, long long unsigned int PTS);
      static std::string & getPESVideoLeadIn(unsigned int NewLen, long long unsigned int PTS);
      
      void FillFree(std::string & PackageData);
      int FillFree(const char* PackageData, int maxLen);
      unsigned int AddStuffing(int NumBytes);
    private:
      //int Free;
      std::string strBuf;
      //char Buffer[188];///< The actual data
  };
  //TS::Packet class

  /// Constructs an audio header to be used on each audio frame.
  /// The length of this header will ALWAYS be 7 bytes, and has to be 
  /// prepended on each audio frame.
  /// \param FrameLen the length of the current audio frame.
  /// \param initData A string containing the initalization data for this track's codec.
  static inline std::string GetAudioHeader(int FrameLen, std::string initData){
    char StandardHeader[7] = {0xFF, 0xF1, 0x00, 0x00, 0x00, 0x1F, 0xFC};
    FrameLen += 7;
    StandardHeader[2] = ((((initData[0] >> 3) - 1) << 6) & 0xC0); //AAC Profile - 1 ( First two bits )
    StandardHeader[2] |= ((((initData[0] & 0x07) << 1) | ((initData[1] >> 7) & 0x01)) << 2); //AAC Frequency Index
    StandardHeader[2] |= ((initData[1] & 0x20) >> 5); //AAC Channel Config
    StandardHeader[3] = ((initData[1] & 0x18) << 3); //AAC Channel Config (cont.)
    StandardHeader[3] |= ((FrameLen & 0x00001800) >> 11);
    StandardHeader[4] = ((FrameLen & 0x000007F8) >> 3);
    StandardHeader[5] |= ((FrameLen & 0x00000007) << 5);
    return std::string(StandardHeader, 7);
  }

  /// A standard Program Association Table, as generated by FFMPEG.
  /// Seems to be independent of the stream.
  //0x47 = sync byte
  //0x4000 = transport error(1) = 0, payload unit start(1) = 1, priority(1) = 0, PID(13) = 0
  //0x10 = transportscrambling(2) = 0, adaptation(2) = 1, continuity(4) = 0
  //0x00 = pointer = 0
  //0x00 = table ID = 0 = PAT
  //0xB00D = section syntax(1) = 1, 0(1)=0, reserved(2) = 3, section_len(12) = 13
  //0x0001 = transport stream id = 1
  //0xC1 = reserved(2) = 3, version(5)=0, curr_next_indi(1) = 1
  //0x00 = section_number = 0
  //0x00 = last_section_no = 0
  //0x0001 = ProgNo = 1
  //0xF000 = reserved(3) = 7, network pid = 4096
  //0x2AB104B2 = CRC32
  static char PAT[188] = {0x47, 0x40, 0x00, 0x10, 0x00, 0x00, 0xB0, 0x0D, 0x00, 0x01, 0xC1, 0x00, 0x00, 0x00, 0x01, 0xF0, 0x00, 0x2A, 0xB1, 0x04,
      0xB2, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
      0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
      0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
      0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
      0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
      0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
      0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};

  /// A standard Program Mapping Table, as generated by FFMPEG.
  /// Contains both Audio and Video mappings, works also on video- or audio-only streams.
  //0x47 = sync byte
  //0x5000 = transport error(1) = 0, payload unit start(1) = 1, priority(1) = 0, PID(13) = 4096
  //0x10 = transportscrambling(2) = 0, adaptation(2) = 1, continuity(4) = 0
  //0x00 = pointer = 0
  //0x02 = table ID = 2 = PMT
  //0xB017 = section syntax(1) = 1, 0(1)=0, reserved(2) = 3, section_len(12) = 23
  //0x0001 = ProgNo = 1
  //0xC1 = reserved(2) = 3, version(5)=0, curr_next_indi(1) = 1
  //0x00 = section_number = 0
  //0x00 = last_section_no = 0
  //0xE100 = reserved(3) = 7, PCR_PID(13) = 0x100
  //0xF000 = reserved(4) = 15, proginfolen = 0
  //0x1B = streamtype = 27 = H264
  //0xE100 = reserved(3) = 7, elem_ID(13) = 0x100
  //0xF000 = reserved(4) = 15, es_info_len = 0
  //0x0F = streamtype = 15 = audio with ADTS transport syntax
  //0xE101 = reserved(3) = 7, elem_ID(13) = 0x101
  //0xF000 = reserved(4) = 15, es_info_len = 0
  //0x2F44B99B = CRC32
  static char PMT[188] = {0x47, 0x50, 0x00, 0x10, 0x00, 0x02, 0xB0, 0x17, 0x00, 0x01, 0xC1, 0x00, 0x00, 0xE1, 0x00, 0xF0, 0x00, 0x1B, 0xE1, 0x00,
      0xF0, 0x00, 0x0F, 0xE1, 0x01, 0xF0, 0x00, 0x2F, 0x44, 0xB9, 0x9B, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
      0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
      0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
      0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
      0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
      0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
      0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};

} //TS namespace