aom_dsp/bitwriter.h

   1 /*
   2  * Copyright (c) 2016, Alliance for Open Media. All rights reserved
   3  *
   4  * This source code is subject to the terms of the BSD 2 Clause License and
   5  * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
   6  * was not distributed with this source code in the LICENSE file, you can
   7  * obtain it at www.aomedia.org/license/software. If the Alliance for Open
   8  * Media Patent License 1.0 was not distributed with this source code in the
   9  * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
  10  */
  11
  12 #ifndef AOM_AOM_DSP_BITWRITER_H_
  13 #define AOM_AOM_DSP_BITWRITER_H_
  14
  15 #include <assert.h>
  16
  17 #include "config/aom_config.h"
  18
  19 #include "aom_dsp/entenc.h"
  20 #include "aom_dsp/prob.h"
  21
  22 #if CONFIG_RD_DEBUG
  23 #include "av1/common/blockd.h"
  24 #include "av1/encoder/cost.h"
  25 #endif
  26
  27 #if CONFIG_BITSTREAM_DEBUG
  28 #include "aom_util/debug_util.h"
  29 #endif  // CONFIG_BITSTREAM_DEBUG
  30
  31 #ifdef __cplusplus
  32 extern "C" {
  33 #endif
  34
  35 struct aom_writer {
  36   unsigned int pos;
  37   uint8_t *buffer;
  38   od_ec_enc ec;
  39   uint8_t allow_update_cdf;
  40 };
  41
  42 typedef struct aom_writer aom_writer;
  43
  44 typedef struct TOKEN_STATS {
  45   int cost;
  46 #if CONFIG_RD_DEBUG
  47   int txb_coeff_cost_map[TXB_COEFF_COST_MAP_SIZE][TXB_COEFF_COST_MAP_SIZE];
  48 #endif
  49 } TOKEN_STATS;
  50
  51 static INLINE void init_token_stats(TOKEN_STATS *token_stats) {
  52 #if CONFIG_RD_DEBUG
  53   int r, c;
  54   for (r = 0; r < TXB_COEFF_COST_MAP_SIZE; ++r) {
  55     for (c = 0; c < TXB_COEFF_COST_MAP_SIZE; ++c) {
  56       token_stats->txb_coeff_cost_map[r][c] = 0;
  57     }
  58   }
  59 #endif
  60   token_stats->cost = 0;
  61 }
  62
  63 void aom_start_encode(aom_writer *w, uint8_t *buffer);
  64
  65 int aom_stop_encode(aom_writer *w);
  66
  67 int aom_tell_size(aom_writer *w);
  68
  69 static INLINE void aom_write(aom_writer *w, int bit, int probability) {
  70   int p = (0x7FFFFF - (probability << 15) + probability) >> 8;
  71 #if CONFIG_BITSTREAM_DEBUG
  72   aom_cdf_prob cdf[2] = { (aom_cdf_prob)p, 32767 };
  73   bitstream_queue_push(bit, cdf, 2);
  74 #endif
  75
  76   od_ec_encode_bool_q15(&w->ec, bit, p);
  77 }
  78
  79 static INLINE void aom_write_bit(aom_writer *w, int bit) {
  80   aom_write(w, bit, 128);  // aom_prob_half
  81 }
  82
  83 static INLINE void aom_write_literal(aom_writer *w, int data, int bits) {
  84   int bit;
  85
  86   for (bit = bits - 1; bit >= 0; bit--) aom_write_bit(w, 1 & (data >> bit));
  87 }
  88
  89 static INLINE void aom_write_cdf(aom_writer *w, int symb,
  90                                  const aom_cdf_prob *cdf, int nsymbs) {
  91 #if CONFIG_BITSTREAM_DEBUG
  92   bitstream_queue_push(symb, cdf, nsymbs);
  93 #endif
  94
  95   od_ec_encode_cdf_q15(&w->ec, symb, cdf, nsymbs);
  96 }
  97
  98 static INLINE void aom_write_symbol(aom_writer *w, int symb, aom_cdf_prob *cdf,
  99                                     int nsymbs) {
 100   aom_write_cdf(w, symb, cdf, nsymbs);
 101   if (w->allow_update_cdf) update_cdf(cdf, symb, nsymbs);
 102 }
 103
 104 #ifdef __cplusplus
 105 }  // extern "C"
 106 #endif
 107
 108 #endif  // AOM_AOM_DSP_BITWRITER_H_