new_contents: #!/usr/bin/env python
  
  class MediaChunk:
      def __init__(self):
  
  class NetworkMediaInfo:
      def __init__(self):
  
  class H:
      def __init__(self):
          networkMediaInfo = NetworkMediaInfo()
  
      def process(self, chunk):
          networkMediaInfo.PreviousBitrate = networkMediaInfo.NextBitrate
          downloadSize = chunk.Length
          downloadBandwidth = downloadSize * 8 / chunk.downloadDuration
          if downloadBandwidth > 1e9:
              downloadBandwidth = 1e9
          if chunk.ChunkId < 2:
              if chunk.ChunkId == 0:
                  m_packetPairBandwidth = downloadBandwidth
              else:
                  if downloadBandwidth > m_packetPairBandwidth:
                      downloadBandwidth = m_packetPairBandwidth
              m_cacheBandwidth = 5 * m_packetPairBandwidth
              if m_cacheBandwidth < 2 * 1000 * 1000:
                  m_cacheBandwidth = 2 * 1000 * 1000
          if downloadBandwidth < m_cacheBandwidth:
              networkMediaInfo.DownloadBandwidthWindow.Add(downloadBandwidth)
          else:
              downloadBandwidth = networkMediaInfo.DownloadBandwidthWindow.CurrentKernel
          currentBitRateSelected = 0
  
          if networkMediaInfo.DownloadState == 0:
              networkMediaInfo.IsLimitBitrateSteps = False
              if downloadBandwidth > 20 * 1000 * 1000:
                  networkMediaInfo.IsLimitBitrateSteps = true
              if networkMediaInfo.IsLimitBitrateSteps == false && (networkMediaInfo.BufferFullnessWindow.IsDecreasing == true || networkMediaInfo.BufferFullnessWindow.IsSlowChanging == true):
                  networkMediaInfo.IsLimitBitrateSteps = true
              currentBitRateSelected = GetNextBitRateUsingBandwidth(networkMediaInfo, chunkDuration)
              if bufferFullness >= (12 + ((17 - 12) / 2)):
                  networkMediaInfo.RelativeContentDownloadSpeed = sm_NetworkHeuristicsParams.RelativeContentDownloadSpeed
                  networkMediaInfo.DownloadState = 1
          else:
              networkMediaInfo.IsLimitBitrateSteps = false
              if downloadBandwidth >= 20 * 1000 * 1000:
                  networkMediaInfo.IsLimitBitrateSteps = true
              if bufferFullness < 7:
                  currentBitRateSelected = 0
                  networkMediaInfo.ResetImprovingBitRate()
                  networkMediaInfo.DownloadState = 0
              elif networkMediaInfo.BufferFullnessWindow.IsSlowChanging:
                  if bufferFullness < 12:
                      currentBitRateSelected = -1
                      networkMediaInfo.ResetImprovingBitRate()
                  elif bufferFullness > 17:
                      currentBitRateSelected = 1
                  else:
                      currentBitRateSelected = networkMediaInfo.PreviousBitrate
              elif networkMediaInfo.BufferFullnessWindow.IsFastDecreasing:
                  if bufferFullness < 12:
                      currentBitRateSelected = 0
                      networkMediaInfo.ResetImprovingBitRate()
                      networkMediaInfo.DownloadState = 0
                  else:
                      currentBitRateSelected = networkMediaInfo.PreviousBitrate
              else:
                  currentBitRateSelected = 1
          networkMediaInfo.NextBitrate = currentBitRateSelected
      
  if __name__ == '__main__':
          try:
              h = H()
          except KeyboardInterrupt:
              print 'over!'
          exit(0)
  
subject: Create h.py