xbmc/utils/BitstreamReader.h

   1 /*
   2  *  Copyright (C) 2017-2018 Team Kodi
   3  *  This file is part of Kodi - https://kodi.tv
   4  *
   5  *  SPDX-License-Identifier: GPL-2.0-or-later
   6  *  See LICENSES/README.md for more information.
   7  */
   8
   9 #pragma once
  10
  11 #include <stdint.h>
  12
  13 class CBitstreamReader
  14 {
  15 public:
  16   CBitstreamReader(const uint8_t *buf, int len);
  17   uint32_t   ReadBits(int nbits);
  18   void       SkipBits(int nbits);
  19   uint32_t   GetBits(int nbits);
  20   unsigned int Position() { return m_posBits; }
  21   unsigned int AvailableBits() { return length * 8 - m_posBits; }
  22
  23 private:
  24   const uint8_t *buffer, *start;
  25   int offbits = 0, length, oflow = 0;
  26   int m_posBits{0};
  27 };
  28
  29 const uint8_t* find_start_code(const uint8_t* p, const uint8_t* end, uint32_t* state);