gst/rtp/dboolhuff.c

/*
 *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the dboolhuff.LICENSE file in this directory.
 *  See the libvpx original distribution for more information,
 *  including patent information, and author information.
 */


#include "dboolhuff.h"

const unsigned char vp8_norm[256] __attribute__ ((aligned (16))) = {
0, 7, 6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4,
      3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
      2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
      2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
      1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
      1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
      1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
      1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
      0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
      0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
      0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
      0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
      0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
      0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
      0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
      0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};

int
vp8dx_start_decode (BOOL_DECODER * br,
    const unsigned char *source, unsigned int source_sz)
{
  br->user_buffer_end = source + source_sz;
  br->user_buffer = source;
  br->value = 0;
  br->count = -8;
  br->range = 255;

  if (source_sz && !source)
    return 1;

  /* Populate the buffer */
  vp8dx_bool_decoder_fill (br);

  return 0;
}


void
vp8dx_bool_decoder_fill (BOOL_DECODER * br)
{
  const unsigned char *bufptr;
  const unsigned char *bufend;
  VP8_BD_VALUE value;
  int count;
  bufend = br->user_buffer_end;
  bufptr = br->user_buffer;
  value = br->value;
  count = br->count;

  VP8DX_BOOL_DECODER_FILL (count, value, bufptr, bufend);

  br->user_buffer = bufptr;
  br->value = value;
  br->count = count;
}