'use strict';

Object.defineProperty(exports, "__esModule", {
  value: true
});

var _createClass = function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; }(); /**
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      * highly optimized TS demuxer:
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      * parse PAT, PMT
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      * extract PES packet from audio and video PIDs
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      * extract AVC/H264 NAL units and AAC/ADTS samples from PES packet
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      * trigger the remuxer upon parsing completion
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      * it also tries to workaround as best as it can audio codec switch (HE-AAC to AAC and vice versa), without having to restart the MediaSource.
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      * it also controls the remuxing process :
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      * upon discontinuity or level switch detection, it will also notifies the remuxer so that it can reset its state.
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     */

// import Hex from '../utils/hex';


var _adts = require('./adts');

var _adts2 = _interopRequireDefault(_adts);

var _mpegaudio = require('./mpegaudio');

var _mpegaudio2 = _interopRequireDefault(_mpegaudio);

var _events = require('../events');

var _events2 = _interopRequireDefault(_events);

var _expGolomb = require('./exp-golomb');

var _expGolomb2 = _interopRequireDefault(_expGolomb);

var _sampleAes = require('./sample-aes');

var _sampleAes2 = _interopRequireDefault(_sampleAes);

var _logger = require('../utils/logger');

var _errors = require('../errors');

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

var TSDemuxer = function () {
  function TSDemuxer(observer, remuxer, config, typeSupported) {
    _classCallCheck(this, TSDemuxer);

    this.observer = observer;
    this.config = config;
    this.typeSupported = typeSupported;
    this.remuxer = remuxer;
    this.sampleAes = null;
  }

  _createClass(TSDemuxer, [{
    key: 'setDecryptData',
    value: function setDecryptData(decryptdata) {
      if (decryptdata != null && decryptdata.key != null && decryptdata.method === 'SAMPLE-AES') {
        this.sampleAes = new _sampleAes2.default(this.observer, this.config, decryptdata, this.discardEPB);
      } else {
        this.sampleAes = null;
      }
    }
  }, {
    key: 'resetInitSegment',
    value: function resetInitSegment(initSegment, audioCodec, videoCodec, duration) {
      this.pmtParsed = false;
      this._pmtId = -1;
      this._avcTrack = { container: 'video/mp2t', type: 'video', id: -1, inputTimeScale: 90000, sequenceNumber: 0, samples: [], len: 0, dropped: 0 };
      this._audioTrack = { container: 'video/mp2t', type: 'audio', id: -1, inputTimeScale: 90000, duration: duration, sequenceNumber: 0, samples: [], len: 0, isAAC: true };
      this._id3Track = { type: 'id3', id: -1, inputTimeScale: 90000, sequenceNumber: 0, samples: [], len: 0 };
      this._txtTrack = { type: 'text', id: -1, inputTimeScale: 90000, sequenceNumber: 0, samples: [], len: 0 };
      // flush any partial content
      this.aacOverFlow = null;
      this.aacLastPTS = null;
      this.avcSample = null;
      this.audioCodec = audioCodec;
      this.videoCodec = videoCodec;
      this._duration = duration;
    }
  }, {
    key: 'resetTimeStamp',
    value: function resetTimeStamp() {}

    // feed incoming data to the front of the parsing pipeline

  }, {
    key: 'append',
    value: function append(data, timeOffset, contiguous, accurateTimeOffset) {
      var start,
          len = data.length,
          stt,
          pid,
          atf,
          offset,
          pes,
          unknownPIDs = false;
      this.contiguous = contiguous;
      var pmtParsed = this.pmtParsed,
          avcTrack = this._avcTrack,
          audioTrack = this._audioTrack,
          id3Track = this._id3Track,
          avcId = avcTrack.id,
          audioId = audioTrack.id,
          id3Id = id3Track.id,
          pmtId = this._pmtId,
          avcData = avcTrack.pesData,
          audioData = audioTrack.pesData,
          id3Data = id3Track.pesData,
          parsePAT = this._parsePAT,
          parsePMT = this._parsePMT,
          parsePES = this._parsePES,
          parseAVCPES = this._parseAVCPES.bind(this),
          parseAACPES = this._parseAACPES.bind(this),
          parseMPEGPES = this._parseMPEGPES.bind(this),
          parseID3PES = this._parseID3PES.bind(this);

      // don't parse last TS packet if incomplete
      len -= len % 188;
      // loop through TS packets
      for (start = 0; start < len; start += 188) {
        if (data[start] === 0x47) {
          stt = !!(data[start + 1] & 0x40);
          // pid is a 13-bit field starting at the last bit of TS[1]
          pid = ((data[start + 1] & 0x1f) << 8) + data[start + 2];
          atf = (data[start + 3] & 0x30) >> 4;
          // if an adaption field is present, its length is specified by the fifth byte of the TS packet header.
          if (atf > 1) {
            offset = start + 5 + data[start + 4];
            // continue if there is only adaptation field
            if (offset === start + 188) {
              continue;
            }
          } else {
            offset = start + 4;
          }
          switch (pid) {
            case avcId:
              if (stt) {
                if (avcData && (pes = parsePES(avcData))) {
                  parseAVCPES(pes, false);
                }
                avcData = { data: [], size: 0 };
              }
              if (avcData) {
                avcData.data.push(data.subarray(offset, start + 188));
                avcData.size += start + 188 - offset;
              }
              break;
            case audioId:
              if (stt) {
                if (audioData && (pes = parsePES(audioData))) {
                  if (audioTrack.isAAC) {
                    parseAACPES(pes);
                  } else {
                    parseMPEGPES(pes);
                  }
                }
                audioData = { data: [], size: 0 };
              }
              if (audioData) {
                audioData.data.push(data.subarray(offset, start + 188));
                audioData.size += start + 188 - offset;
              }
              break;
            case id3Id:
              if (stt) {
                if (id3Data && (pes = parsePES(id3Data))) {
                  parseID3PES(pes);
                }
                id3Data = { data: [], size: 0 };
              }
              if (id3Data) {
                id3Data.data.push(data.subarray(offset, start + 188));
                id3Data.size += start + 188 - offset;
              }
              break;
            case 0:
              if (stt) {
                offset += data[offset] + 1;
              }
              pmtId = this._pmtId = parsePAT(data, offset);
              break;
            case pmtId:
              if (stt) {
                offset += data[offset] + 1;
              }
              var parsedPIDs = parsePMT(data, offset, this.typeSupported.mpeg === true || this.typeSupported.mp3 === true, this.sampleAes != null);

              // only update track id if track PID found while parsing PMT
              // this is to avoid resetting the PID to -1 in case
              // track PID transiently disappears from the stream
              // this could happen in case of transient missing audio samples for example
              avcId = parsedPIDs.avc;
              if (avcId > 0) {
                avcTrack.id = avcId;
              }
              audioId = parsedPIDs.audio;
              if (audioId > 0) {
                audioTrack.id = audioId;
                audioTrack.isAAC = parsedPIDs.isAAC;
              }
              id3Id = parsedPIDs.id3;
              if (id3Id > 0) {
                id3Track.id = id3Id;
              }
              if (unknownPIDs && !pmtParsed) {
                _logger.logger.log('reparse from beginning');
                unknownPIDs = false;
                // we set it to -188, the += 188 in the for loop will reset start to 0
                start = -188;
              }
              pmtParsed = this.pmtParsed = true;
              break;
            case 17:
            case 0x1fff:
              break;
            default:
              unknownPIDs = true;
              break;
          }
        } else {
          this.observer.trigger(_events2.default.ERROR, { type: _errors.ErrorTypes.MEDIA_ERROR, details: _errors.ErrorDetails.FRAG_PARSING_ERROR, fatal: false, reason: 'TS packet did not start with 0x47' });
        }
      }
      // try to parse last PES packets
      if (avcData && (pes = parsePES(avcData))) {
        parseAVCPES(pes, true);
        avcTrack.pesData = null;
      } else {
        // either avcData null or PES truncated, keep it for next frag parsing
        avcTrack.pesData = avcData;
      }

      if (audioData && (pes = parsePES(audioData))) {
        if (audioTrack.isAAC) {
          parseAACPES(pes);
        } else {
          parseMPEGPES(pes);
        }
        audioTrack.pesData = null;
      } else {
        if (audioData && audioData.size) {
          _logger.logger.log('last AAC PES packet truncated,might overlap between fragments');
        }
        // either audioData null or PES truncated, keep it for next frag parsing
        audioTrack.pesData = audioData;
      }

      if (id3Data && (pes = parsePES(id3Data))) {
        parseID3PES(pes);
        id3Track.pesData = null;
      } else {
        // either id3Data null or PES truncated, keep it for next frag parsing
        id3Track.pesData = id3Data;
      }

      if (this.sampleAes == null) {
        this.remuxer.remux(audioTrack, avcTrack, id3Track, this._txtTrack, timeOffset, contiguous, accurateTimeOffset);
      } else {
        this.decryptAndRemux(audioTrack, avcTrack, id3Track, this._txtTrack, timeOffset, contiguous, accurateTimeOffset);
      }
    }
  }, {
    key: 'decryptAndRemux',
    value: function decryptAndRemux(audioTrack, videoTrack, id3Track, textTrack, timeOffset, contiguous, accurateTimeOffset) {
      if (audioTrack.samples && audioTrack.isAAC) {
        var localthis = this;
        this.sampleAes.decryptAacSamples(audioTrack.samples, 0, function () {
          localthis.decryptAndRemuxAvc(audioTrack, videoTrack, id3Track, textTrack, timeOffset, contiguous, accurateTimeOffset);
        });
      } else {
        this.decryptAndRemuxAvc(audioTrack, videoTrack, id3Track, textTrack, timeOffset, contiguous, accurateTimeOffset);
      }
    }
  }, {
    key: 'decryptAndRemuxAvc',
    value: function decryptAndRemuxAvc(audioTrack, videoTrack, id3Track, textTrack, timeOffset, contiguous, accurateTimeOffset) {
      if (videoTrack.samples) {
        var localthis = this;
        this.sampleAes.decryptAvcSamples(videoTrack.samples, 0, 0, function () {
          localthis.remuxer.remux(audioTrack, videoTrack, id3Track, textTrack, timeOffset, contiguous, accurateTimeOffset);
        });
      } else {
        this.remuxer.remux(audioTrack, videoTrack, id3Track, textTrack, timeOffset, contiguous, accurateTimeOffset);
      }
    }
  }, {
    key: 'destroy',
    value: function destroy() {
      this._initPTS = this._initDTS = undefined;
      this._duration = 0;
    }
  }, {
    key: '_parsePAT',
    value: function _parsePAT(data, offset) {
      // skip the PSI header and parse the first PMT entry
      return (data[offset + 10] & 0x1F) << 8 | data[offset + 11];
      //logger.log('PMT PID:'  + this._pmtId);
    }
  }, {
    key: '_parsePMT',
    value: function _parsePMT(data, offset, mpegSupported, isSampleAes) {
      var sectionLength,
          tableEnd,
          programInfoLength,
          pid,
          result = { audio: -1, avc: -1, id3: -1, isAAC: true };
      sectionLength = (data[offset + 1] & 0x0f) << 8 | data[offset + 2];
      tableEnd = offset + 3 + sectionLength - 4;
      // to determine where the table is, we have to figure out how
      // long the program info descriptors are
      programInfoLength = (data[offset + 10] & 0x0f) << 8 | data[offset + 11];
      // advance the offset to the first entry in the mapping table
      offset += 12 + programInfoLength;
      while (offset < tableEnd) {
        pid = (data[offset + 1] & 0x1F) << 8 | data[offset + 2];
        switch (data[offset]) {
          case 0xcf:
            // SAMPLE-AES AAC
            if (!isSampleAes) {
              _logger.logger.log('unkown stream type:' + data[offset]);
              break;
            }
          /* falls through */

          // ISO/IEC 13818-7 ADTS AAC (MPEG-2 lower bit-rate audio)
          case 0x0f:
            //logger.log('AAC PID:'  + pid);
            if (result.audio === -1) {
              result.audio = pid;
            }
            break;

          // Packetized metadata (ID3)
          case 0x15:
            //logger.log('ID3 PID:'  + pid);
            if (result.id3 === -1) {
              result.id3 = pid;
            }
            break;

          case 0xdb:
            // SAMPLE-AES AVC
            if (!isSampleAes) {
              _logger.logger.log('unkown stream type:' + data[offset]);
              break;
            }
          /* falls through */

          // ITU-T Rec. H.264 and ISO/IEC 14496-10 (lower bit-rate video)
          case 0x1b:
            //logger.log('AVC PID:'  + pid);
            if (result.avc === -1) {
              result.avc = pid;
            }
            break;

          // ISO/IEC 11172-3 (MPEG-1 audio)
          // or ISO/IEC 13818-3 (MPEG-2 halved sample rate audio)
          case 0x03:
          case 0x04:
            //logger.log('MPEG PID:'  + pid);
            if (!mpegSupported) {
              _logger.logger.log('MPEG audio found, not supported in this browser for now');
            } else if (result.audio === -1) {
              result.audio = pid;
              result.isAAC = false;
            }
            break;

          case 0x24:
            _logger.logger.warn('HEVC stream type found, not supported for now');
            break;

          default:
            _logger.logger.log('unkown stream type:' + data[offset]);
            break;
        }
        // move to the next table entry
        // skip past the elementary stream descriptors, if present
        offset += ((data[offset + 3] & 0x0F) << 8 | data[offset + 4]) + 5;
      }
      return result;
    }
  }, {
    key: '_parsePES',
    value: function _parsePES(stream) {
      var i = 0,
          frag,
          pesFlags,
          pesPrefix,
          pesLen,
          pesHdrLen,
          pesData,
          pesPts,
          pesDts,
          payloadStartOffset,
          data = stream.data;
      // safety check
      if (!stream || stream.size === 0) {
        return null;
      }

      // we might need up to 19 bytes to read PES header
      // if first chunk of data is less than 19 bytes, let's merge it with following ones until we get 19 bytes
      // usually only one merge is needed (and this is rare ...)
      while (data[0].length < 19 && data.length > 1) {
        var newData = new Uint8Array(data[0].length + data[1].length);
        newData.set(data[0]);
        newData.set(data[1], data[0].length);
        data[0] = newData;
        data.splice(1, 1);
      }
      //retrieve PTS/DTS from first fragment
      frag = data[0];
      pesPrefix = (frag[0] << 16) + (frag[1] << 8) + frag[2];
      if (pesPrefix === 1) {
        pesLen = (frag[4] << 8) + frag[5];
        // if PES parsed length is not zero and greater than total received length, stop parsing. PES might be truncated
        // minus 6 : PES header size
        if (pesLen && pesLen > stream.size - 6) {
          return null;
        }
        pesFlags = frag[7];
        if (pesFlags & 0xC0) {
          /* PES header described here : http://dvd.sourceforge.net/dvdinfo/pes-hdr.html
              as PTS / DTS is 33 bit we cannot use bitwise operator in JS,
              as Bitwise operators treat their operands as a sequence of 32 bits */
          pesPts = (frag[9] & 0x0E) * 536870912 + // 1 << 29
          (frag[10] & 0xFF) * 4194304 + // 1 << 22
          (frag[11] & 0xFE) * 16384 + // 1 << 14
          (frag[12] & 0xFF) * 128 + // 1 << 7
          (frag[13] & 0xFE) / 2;
          // check if greater than 2^32 -1
          if (pesPts > 4294967295) {
            // decrement 2^33
            pesPts -= 8589934592;
          }
          if (pesFlags & 0x40) {
            pesDts = (frag[14] & 0x0E) * 536870912 + // 1 << 29
            (frag[15] & 0xFF) * 4194304 + // 1 << 22
            (frag[16] & 0xFE) * 16384 + // 1 << 14
            (frag[17] & 0xFF) * 128 + // 1 << 7
            (frag[18] & 0xFE) / 2;
            // check if greater than 2^32 -1
            if (pesDts > 4294967295) {
              // decrement 2^33
              pesDts -= 8589934592;
            }
            if (pesPts - pesDts > 60 * 90000) {
              _logger.logger.warn(Math.round((pesPts - pesDts) / 90000) + 's delta between PTS and DTS, align them');
              pesPts = pesDts;
            }
          } else {
            pesDts = pesPts;
          }
        }
        pesHdrLen = frag[8];
        // 9 bytes : 6 bytes for PES header + 3 bytes for PES extension
        payloadStartOffset = pesHdrLen + 9;

        stream.size -= payloadStartOffset;
        //reassemble PES packet
        pesData = new Uint8Array(stream.size);
        for (var j = 0, dataLen = data.length; j < dataLen; j++) {
          frag = data[j];
          var len = frag.byteLength;
          if (payloadStartOffset) {
            if (payloadStartOffset > len) {
              // trim full frag if PES header bigger than frag
              payloadStartOffset -= len;
              continue;
            } else {
              // trim partial frag if PES header smaller than frag
              frag = frag.subarray(payloadStartOffset);
              len -= payloadStartOffset;
              payloadStartOffset = 0;
            }
          }
          pesData.set(frag, i);
          i += len;
        }
        if (pesLen) {
          // payload size : remove PES header + PES extension
          pesLen -= pesHdrLen + 3;
        }
        return { data: pesData, pts: pesPts, dts: pesDts, len: pesLen };
      } else {
        return null;
      }
    }
  }, {
    key: 'pushAccesUnit',
    value: function pushAccesUnit(avcSample, avcTrack) {
      if (avcSample.units.length && avcSample.frame) {
        var samples = avcTrack.samples;
        var nbSamples = samples.length;
        // only push AVC sample if starting with a keyframe is not mandatory OR
        //    if keyframe already found in this fragment OR
        //       keyframe found in last fragment (track.sps) AND
        //          samples already appended (we already found a keyframe in this fragment) OR fragment is contiguous
        if (!this.config.forceKeyFrameOnDiscontinuity || avcSample.key === true || avcTrack.sps && (nbSamples || this.contiguous)) {
          avcSample.id = nbSamples;
          samples.push(avcSample);
        } else {
          // dropped samples, track it
          avcTrack.dropped++;
        }
      }
      if (avcSample.debug.length) {
        _logger.logger.log(avcSample.pts + '/' + avcSample.dts + ':' + avcSample.debug);
      }
    }
  }, {
    key: '_parseAVCPES',
    value: function _parseAVCPES(pes, last) {
      var _this = this;

      //logger.log('parse new PES');
      var track = this._avcTrack,
          units = this._parseAVCNALu(pes.data),
          debug = false,
          expGolombDecoder,
          avcSample = this.avcSample,
          push,
          spsfound = false,
          i,
          pushAccesUnit = this.pushAccesUnit.bind(this),
          createAVCSample = function createAVCSample(key, pts, dts, debug) {
        return { key: key, pts: pts, dts: dts, units: [], debug: debug };
      };
      //free pes.data to save up some memory
      pes.data = null;

      // if new NAL units found and last sample still there, let's push ...
      // this helps parsing streams with missing AUD
      if (avcSample && units.length) {
        pushAccesUnit(avcSample, track);
        avcSample = this.avcSample = createAVCSample(false, pes.pts, pes.dts, '');
      }

      units.forEach(function (unit) {
        switch (unit.type) {
          //NDR
          case 1:
            push = true;
            if (debug && avcSample) {
              avcSample.debug += 'NDR ';
            }
            avcSample.frame = true;
            var data = unit.data;
            // only check slice type to detect KF in case SPS found in same packet (any keyframe is preceded by SPS ...)
            if (spsfound && data.length > 4) {
              // retrieve slice type by parsing beginning of NAL unit (follow H264 spec, slice_header definition) to detect keyframe embedded in NDR
              var sliceType = new _expGolomb2.default(data).readSliceType();
              // 2 : I slice, 4 : SI slice, 7 : I slice, 9: SI slice
              // SI slice : A slice that is coded using intra prediction only and using quantisation of the prediction samples.
              // An SI slice can be coded such that its decoded samples can be constructed identically to an SP slice.
              // I slice: A slice that is not an SI slice that is decoded using intra prediction only.
              //if (sliceType === 2 || sliceType === 7) {
              if (sliceType === 2 || sliceType === 4 || sliceType === 7 || sliceType === 9) {
                avcSample.key = true;
              }
            }
            break;
          //IDR
          case 5:
            push = true;
            // handle PES not starting with AUD
            if (!avcSample) {
              avcSample = _this.avcSample = createAVCSample(true, pes.pts, pes.dts, '');
            }
            if (debug) {
              avcSample.debug += 'IDR ';
            }
            avcSample.key = true;
            avcSample.frame = true;
            break;
          //SEI
          case 6:
            push = true;
            if (debug && avcSample) {
              avcSample.debug += 'SEI ';
            }
            expGolombDecoder = new _expGolomb2.default(_this.discardEPB(unit.data));

            // skip frameType
            expGolombDecoder.readUByte();

            var payloadType = 0;
            var payloadSize = 0;
            var endOfCaptions = false;
            var b = 0;

            while (!endOfCaptions && expGolombDecoder.bytesAvailable > 1) {
              payloadType = 0;
              do {
                b = expGolombDecoder.readUByte();
                payloadType += b;
              } while (b === 0xFF);

              // Parse payload size.
              payloadSize = 0;
              do {
                b = expGolombDecoder.readUByte();
                payloadSize += b;
              } while (b === 0xFF);

              // TODO: there can be more than one payload in an SEI packet...
              // TODO: need to read type and size in a while loop to get them all
              if (payloadType === 4 && expGolombDecoder.bytesAvailable !== 0) {

                endOfCaptions = true;

                var countryCode = expGolombDecoder.readUByte();

                if (countryCode === 181) {
                  var providerCode = expGolombDecoder.readUShort();

                  if (providerCode === 49) {
                    var userStructure = expGolombDecoder.readUInt();

                    if (userStructure === 0x47413934) {
                      var userDataType = expGolombDecoder.readUByte();

                      // Raw CEA-608 bytes wrapped in CEA-708 packet
                      if (userDataType === 3) {
                        var firstByte = expGolombDecoder.readUByte();
                        var secondByte = expGolombDecoder.readUByte();

                        var totalCCs = 31 & firstByte;
                        var byteArray = [firstByte, secondByte];

                        for (i = 0; i < totalCCs; i++) {
                          // 3 bytes per CC
                          byteArray.push(expGolombDecoder.readUByte());
                          byteArray.push(expGolombDecoder.readUByte());
                          byteArray.push(expGolombDecoder.readUByte());
                        }

                        _this._insertSampleInOrder(_this._txtTrack.samples, { type: 3, pts: pes.pts, bytes: byteArray });
                      }
                    }
                  }
                }
              } else if (payloadSize < expGolombDecoder.bytesAvailable) {
                for (i = 0; i < payloadSize; i++) {
                  expGolombDecoder.readUByte();
                }
              }
            }
            break;
          //SPS
          case 7:
            push = true;
            spsfound = true;
            if (debug && avcSample) {
              avcSample.debug += 'SPS ';
            }
            if (!track.sps) {
              expGolombDecoder = new _expGolomb2.default(unit.data);
              var config = expGolombDecoder.readSPS();
              track.width = config.width;
              track.height = config.height;
              track.pixelRatio = config.pixelRatio;
              track.sps = [unit.data];
              track.duration = _this._duration;
              var codecarray = unit.data.subarray(1, 4);
              var codecstring = 'avc1.';
              for (i = 0; i < 3; i++) {
                var h = codecarray[i].toString(16);
                if (h.length < 2) {
                  h = '0' + h;
                }
                codecstring += h;
              }
              track.codec = codecstring;
            }
            break;
          //PPS
          case 8:
            push = true;
            if (debug && avcSample) {
              avcSample.debug += 'PPS ';
            }
            if (!track.pps) {
              track.pps = [unit.data];
            }
            break;
          // AUD
          case 9:
            push = false;
            if (avcSample) {
              pushAccesUnit(avcSample, track);
            }
            avcSample = _this.avcSample = createAVCSample(false, pes.pts, pes.dts, debug ? 'AUD ' : '');
            break;
          // Filler Data
          case 12:
            push = false;
            break;
          default:
            push = false;
            if (avcSample) {
              avcSample.debug += 'unknown NAL ' + unit.type + ' ';
            }
            break;
        }
        if (avcSample && push) {
          var _units = avcSample.units;
          _units.push(unit);
        }
      });
      // if last PES packet, push samples
      if (last && avcSample) {
        pushAccesUnit(avcSample, track);
        this.avcSample = null;
      }
    }
  }, {
    key: '_insertSampleInOrder',
    value: function _insertSampleInOrder(arr, data) {
      var len = arr.length;
      if (len > 0) {
        if (data.pts >= arr[len - 1].pts) {
          arr.push(data);
        } else {
          for (var pos = len - 1; pos >= 0; pos--) {
            if (data.pts < arr[pos].pts) {
              arr.splice(pos, 0, data);
              break;
            }
          }
        }
      } else {
        arr.push(data);
      }
    }
  }, {
    key: '_getLastNalUnit',
    value: function _getLastNalUnit() {
      var avcSample = this.avcSample,
          lastUnit = void 0;
      // try to fallback to previous sample if current one is empty
      if (!avcSample || avcSample.units.length === 0) {
        var track = this._avcTrack,
            samples = track.samples;
        avcSample = samples[samples.length - 1];
      }
      if (avcSample) {
        var units = avcSample.units;
        lastUnit = units[units.length - 1];
      }
      return lastUnit;
    }
  }, {
    key: '_parseAVCNALu',
    value: function _parseAVCNALu(array) {
      var i = 0,
          len = array.byteLength,
          value,
          overflow,
          track = this._avcTrack,
          state = track.naluState || 0,
          lastState = state;
      var units = [],
          unit,
          unitType,
          lastUnitStart = -1,
          lastUnitType;
      //logger.log('PES:' + Hex.hexDump(array));

      if (state === -1) {
        // special use case where we found 3 or 4-byte start codes exactly at the end of previous PES packet
        lastUnitStart = 0;
        // NALu type is value read from offset 0
        lastUnitType = array[0] & 0x1f;
        state = 0;
        i = 1;
      }

      while (i < len) {
        value = array[i++];
        // optimization. state 0 and 1 are the predominant case. let's handle them outside of the switch/case
        if (!state) {
          state = value ? 0 : 1;
          continue;
        }
        if (state === 1) {
          state = value ? 0 : 2;
          continue;
        }
        // here we have state either equal to 2 or 3
        if (!value) {
          state = 3;
        } else if (value === 1) {
          if (lastUnitStart >= 0) {
            unit = { data: array.subarray(lastUnitStart, i - state - 1), type: lastUnitType };
            //logger.log('pushing NALU, type/size:' + unit.type + '/' + unit.data.byteLength);
            units.push(unit);
          } else {
            // lastUnitStart is undefined => this is the first start code found in this PES packet
            // first check if start code delimiter is overlapping between 2 PES packets,
            // ie it started in last packet (lastState not zero)
            // and ended at the beginning of this PES packet (i <= 4 - lastState)
            var lastUnit = this._getLastNalUnit();
            if (lastUnit) {
              if (lastState && i <= 4 - lastState) {
                // start delimiter overlapping between PES packets
                // strip start delimiter bytes from the end of last NAL unit
                // check if lastUnit had a state different from zero
                if (lastUnit.state) {
                  // strip last bytes
                  lastUnit.data = lastUnit.data.subarray(0, lastUnit.data.byteLength - lastState);
                }
              }
              // If NAL units are not starting right at the beginning of the PES packet, push preceding data into previous NAL unit.
              overflow = i - state - 1;
              if (overflow > 0) {
                //logger.log('first NALU found with overflow:' + overflow);
                var tmp = new Uint8Array(lastUnit.data.byteLength + overflow);
                tmp.set(lastUnit.data, 0);
                tmp.set(array.subarray(0, overflow), lastUnit.data.byteLength);
                lastUnit.data = tmp;
              }
            }
          }
          // check if we can read unit type
          if (i < len) {
            unitType = array[i] & 0x1f;
            //logger.log('find NALU @ offset:' + i + ',type:' + unitType);
            lastUnitStart = i;
            lastUnitType = unitType;
            state = 0;
          } else {
            // not enough byte to read unit type. let's read it on next PES parsing
            state = -1;
          }
        } else {
          state = 0;
        }
      }
      if (lastUnitStart >= 0 && state >= 0) {
        unit = { data: array.subarray(lastUnitStart, len), type: lastUnitType, state: state };
        units.push(unit);
        //logger.log('pushing NALU, type/size/state:' + unit.type + '/' + unit.data.byteLength + '/' + state);
      }
      // no NALu found
      if (units.length === 0) {
        // append pes.data to previous NAL unit
        var _lastUnit = this._getLastNalUnit();
        if (_lastUnit) {
          var _tmp = new Uint8Array(_lastUnit.data.byteLength + array.byteLength);
          _tmp.set(_lastUnit.data, 0);
          _tmp.set(array, _lastUnit.data.byteLength);
          _lastUnit.data = _tmp;
        }
      }
      track.naluState = state;
      return units;
    }

    /**
     * remove Emulation Prevention bytes from a RBSP
     */

  }, {
    key: 'discardEPB',
    value: function discardEPB(data) {
      var length = data.byteLength,
          EPBPositions = [],
          i = 1,
          newLength,
          newData;

      // Find all `Emulation Prevention Bytes`
      while (i < length - 2) {
        if (data[i] === 0 && data[i + 1] === 0 && data[i + 2] === 0x03) {
          EPBPositions.push(i + 2);
          i += 2;
        } else {
          i++;
        }
      }

      // If no Emulation Prevention Bytes were found just return the original
      // array
      if (EPBPositions.length === 0) {
        return data;
      }

      // Create a new array to hold the NAL unit data
      newLength = length - EPBPositions.length;
      newData = new Uint8Array(newLength);
      var sourceIndex = 0;

      for (i = 0; i < newLength; sourceIndex++, i++) {
        if (sourceIndex === EPBPositions[0]) {
          // Skip this byte
          sourceIndex++;
          // Remove this position index
          EPBPositions.shift();
        }
        newData[i] = data[sourceIndex];
      }
      return newData;
    }
  }, {
    key: '_parseAACPES',
    value: function _parseAACPES(pes) {
      var track = this._audioTrack,
          data = pes.data,
          pts = pes.pts,
          startOffset = 0,
          aacOverFlow = this.aacOverFlow,
          aacLastPTS = this.aacLastPTS,
          frameDuration,
          frameIndex,
          offset,
          stamp,
          len;
      if (aacOverFlow) {
        var tmp = new Uint8Array(aacOverFlow.byteLength + data.byteLength);
        tmp.set(aacOverFlow, 0);
        tmp.set(data, aacOverFlow.byteLength);
        //logger.log(`AAC: append overflowing ${aacOverFlow.byteLength} bytes to beginning of new PES`);
        data = tmp;
      }
      // look for ADTS header (0xFFFx)
      for (offset = startOffset, len = data.length; offset < len - 1; offset++) {
        if (_adts2.default.isHeader(data, offset)) {
          break;
        }
      }
      // if ADTS header does not start straight from the beginning of the PES payload, raise an error
      if (offset) {
        var reason, fatal;
        if (offset < len - 1) {
          reason = 'AAC PES did not start with ADTS header,offset:' + offset;
          fatal = false;
        } else {
          reason = 'no ADTS header found in AAC PES';
          fatal = true;
        }
        _logger.logger.warn('parsing error:' + reason);
        this.observer.trigger(_events2.default.ERROR, { type: _errors.ErrorTypes.MEDIA_ERROR, details: _errors.ErrorDetails.FRAG_PARSING_ERROR, fatal: fatal, reason: reason });
        if (fatal) {
          return;
        }
      }

      _adts2.default.initTrackConfig(track, this.observer, data, offset, this.audioCodec);
      frameIndex = 0;
      frameDuration = _adts2.default.getFrameDuration(track.samplerate);

      // if last AAC frame is overflowing, we should ensure timestamps are contiguous:
      // first sample PTS should be equal to last sample PTS + frameDuration
      if (aacOverFlow && aacLastPTS) {
        var newPTS = aacLastPTS + frameDuration;
        if (Math.abs(newPTS - pts) > 1) {
          _logger.logger.log('AAC: align PTS for overlapping frames by ' + Math.round((newPTS - pts) / 90));
          pts = newPTS;
        }
      }

      //scan for aac samples
      while (offset < len) {
        if (_adts2.default.isHeader(data, offset) && offset + 5 < len) {
          var frame = _adts2.default.appendFrame(track, data, offset, pts, frameIndex);
          if (frame) {
            //logger.log(`${Math.round(frame.sample.pts)} : AAC`);
            offset += frame.length;
            stamp = frame.sample.pts;
            frameIndex++;
          } else {
            //logger.log('Unable to parse AAC frame');
            break;
          }
        } else {
          //nothing found, keep looking
          offset++;
        }
      }

      if (offset < len) {
        aacOverFlow = data.subarray(offset, len);
        //logger.log(`AAC: overflow detected:${len-offset}`);
      } else {
        aacOverFlow = null;
      }
      this.aacOverFlow = aacOverFlow;
      this.aacLastPTS = stamp;
    }
  }, {
    key: '_parseMPEGPES',
    value: function _parseMPEGPES(pes) {
      var data = pes.data;
      var length = data.length;
      var frameIndex = 0;
      var offset = 0;
      var pts = pes.pts;

      while (offset < length) {
        if (_mpegaudio2.default.isHeader(data, offset)) {
          var frame = _mpegaudio2.default.appendFrame(this._audioTrack, data, offset, pts, frameIndex);
          if (frame) {
            offset += frame.length;
            frameIndex++;
          } else {
            //logger.log('Unable to parse Mpeg audio frame');
            break;
          }
        } else {
          //nothing found, keep looking
          offset++;
        }
      }
    }
  }, {
    key: '_parseID3PES',
    value: function _parseID3PES(pes) {
      this._id3Track.samples.push(pes);
    }
  }], [{
    key: 'probe',
    value: function probe(data) {
      // a TS fragment should contain at least 3 TS packets, a PAT, a PMT, and one PID, each starting with 0x47
      if (data.length >= 3 * 188 && data[0] === 0x47 && data[188] === 0x47 && data[2 * 188] === 0x47) {
        return true;
      } else {
        return false;
      }
    }
  }]);

  return TSDemuxer;
}();

exports.default = TSDemuxer;