File: boolwriter.hh

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/*
 *  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 LICENSE banner below
 *  An additional intellectual property rights grant can be found
 *  in the file PATENTS.  All contributing project authors may
 *  be found in the VPX_AUTHORS file in this directory
 */
/*
Copyright (c) 2010, Google Inc. All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.

Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.

Neither the name of Google nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS “AS IS” AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#ifndef VPX_DSP_BITWRITER_H_
#define VPX_DSP_BITWRITER_H_

#include <stdint.h>

#include "vpx_config.hh"
#include "billing.hh"
#ifdef __cplusplus
extern "C" {
#endif

typedef struct vpx_writer {
  unsigned int lowvalue;
  unsigned int range;
  int count;
  unsigned int pos;
  uint8_t *buffer;
} vpx_writer;

void vpx_start_encode(vpx_writer *bc, uint8_t *buffer);
void vpx_stop_encode(vpx_writer *bc);

extern int w_bitcount;

static INLINE void vpx_write(vpx_writer *br, int bit, int probability, Billing bill) {
  unsigned int split;
  int count = br->count;
  unsigned int range = br->range;
  unsigned int lowvalue = br->lowvalue;
  unsigned int shift;

  #ifdef DEBUG_ARICODER
    //if (w_bitcount < 1000) {
      fprintf(stderr, "W %d %d %d\n", w_bitcount++, probability, bit);
    //}
  #endif

  split = 1 + (((range - 1) * probability) >> 8);

  range = split;

  if (bit) {
    lowvalue += split;
    range = br->range - split;
  }
  static constexpr uint8_t vpx_norm[256] = {
      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
  };
  shift = vpx_norm[range];

  range <<= shift;
  count += shift;
  write_bit_bill(bill, true, shift);

  if (count >= 0) {
    int offset = shift - count;

    if ((lowvalue << (offset - 1)) & 0x80000000) {
      int x = br->pos - 1;

      while (x >= 0 && br->buffer[x] == 0xff) {
        br->buffer[x] = 0;
        x--;
      }

      br->buffer[x] += 1;
    }

    br->buffer[br->pos++] = (lowvalue >> (24 - offset));
    lowvalue <<= offset;
    shift = count;
    lowvalue &= 0xffffff;
    count -= 8;
  }

  lowvalue <<= shift;
  br->count = count;
  br->lowvalue = lowvalue;
  br->range = range;
}


#ifdef __cplusplus
}  // extern "C"
#endif

#endif  // VPX_DSP_BITWRITER_H_