func: void ff_vp56_init_range_decoder(VP56RangeCoder *c, const uint8_t *buf, int buf_size)
  
  {
  
      c->high = 255;
  
      c->bits = -16;
  
      c->buffer = buf;
  
      c->end = buf + buf_size;
  
      c->code_word = bytestream_get_be24(&c->buffer);
  
  }
  