Blame src/enc/frame_enc.c

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// Copyright 2011 Google Inc. All Rights Reserved.
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//
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// Use of this source code is governed by a BSD-style license
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// that can be found in the COPYING file in the root of the source
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// tree. An additional intellectual property rights grant can be found
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// in the file PATENTS. All contributing project authors may
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// be found in the AUTHORS file in the root of the source tree.
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// -----------------------------------------------------------------------------
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//
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//   frame coding and analysis
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//
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// Author: Skal (pascal.massimino@gmail.com)
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#include <string.h>
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#include <math.h>
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#include "src/enc/cost_enc.h"
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#include "src/enc/vp8i_enc.h"
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#include "src/dsp/dsp.h"
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#include "src/webp/format_constants.h"  // RIFF constants
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#define SEGMENT_VISU 0
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#define DEBUG_SEARCH 0    // useful to track search convergence
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//------------------------------------------------------------------------------
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// multi-pass convergence
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#define HEADER_SIZE_ESTIMATE (RIFF_HEADER_SIZE + CHUNK_HEADER_SIZE +  \
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                              VP8_FRAME_HEADER_SIZE)
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#define DQ_LIMIT 0.4  // convergence is considered reached if dq < DQ_LIMIT
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// we allow 2k of extra head-room in PARTITION0 limit.
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#define PARTITION0_SIZE_LIMIT ((VP8_MAX_PARTITION0_SIZE - 2048ULL) << 11)
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typedef struct {  // struct for organizing convergence in either size or PSNR
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  int is_first;
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  float dq;
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  float q, last_q;
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  double value, last_value;   // PSNR or size
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  double target;
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  int do_size_search;
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} PassStats;
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static int InitPassStats(const VP8Encoder* const enc, PassStats* const s) {
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  const uint64_t target_size = (uint64_t)enc->config_->target_size;
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  const int do_size_search = (target_size != 0);
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  const float target_PSNR = enc->config_->target_PSNR;
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  s->is_first = 1;
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  s->dq = 10.f;
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  s->q = s->last_q = enc->config_->quality;
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  s->target = do_size_search ? (double)target_size
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            : (target_PSNR > 0.) ? target_PSNR
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            : 40.;   // default, just in case
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  s->value = s->last_value = 0.;
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  s->do_size_search = do_size_search;
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  return do_size_search;
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}
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static float Clamp(float v, float min, float max) {
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  return (v < min) ? min : (v > max) ? max : v;
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}
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static float ComputeNextQ(PassStats* const s) {
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  float dq;
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  if (s->is_first) {
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    dq = (s->value > s->target) ? -s->dq : s->dq;
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    s->is_first = 0;
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  } else if (s->value != s->last_value) {
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    const double slope = (s->target - s->value) / (s->last_value - s->value);
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    dq = (float)(slope * (s->last_q - s->q));
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  } else {
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    dq = 0.;  // we're done?!
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  }
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  // Limit variable to avoid large swings.
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  s->dq = Clamp(dq, -30.f, 30.f);
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  s->last_q = s->q;
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  s->last_value = s->value;
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  s->q = Clamp(s->q + s->dq, 0.f, 100.f);
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  return s->q;
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}
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//------------------------------------------------------------------------------
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// Tables for level coding
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const uint8_t VP8Cat3[] = { 173, 148, 140 };
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const uint8_t VP8Cat4[] = { 176, 155, 140, 135 };
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const uint8_t VP8Cat5[] = { 180, 157, 141, 134, 130 };
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const uint8_t VP8Cat6[] =
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    { 254, 254, 243, 230, 196, 177, 153, 140, 133, 130, 129 };
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//------------------------------------------------------------------------------
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// Reset the statistics about: number of skips, token proba, level cost,...
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static void ResetStats(VP8Encoder* const enc) {
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  VP8EncProba* const proba = &enc->proba_;
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  VP8CalculateLevelCosts(proba);
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  proba->nb_skip_ = 0;
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}
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//------------------------------------------------------------------------------
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// Skip decision probability
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#define SKIP_PROBA_THRESHOLD 250  // value below which using skip_proba is OK.
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static int CalcSkipProba(uint64_t nb, uint64_t total) {
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  return (int)(total ? (total - nb) * 255 / total : 255);
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}
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// Returns the bit-cost for coding the skip probability.
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static int FinalizeSkipProba(VP8Encoder* const enc) {
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  VP8EncProba* const proba = &enc->proba_;
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  const int nb_mbs = enc->mb_w_ * enc->mb_h_;
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  const int nb_events = proba->nb_skip_;
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  int size;
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  proba->skip_proba_ = CalcSkipProba(nb_events, nb_mbs);
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  proba->use_skip_proba_ = (proba->skip_proba_ < SKIP_PROBA_THRESHOLD);
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  size = 256;   // 'use_skip_proba' bit
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  if (proba->use_skip_proba_) {
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    size +=  nb_events * VP8BitCost(1, proba->skip_proba_)
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         + (nb_mbs - nb_events) * VP8BitCost(0, proba->skip_proba_);
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    size += 8 * 256;   // cost of signaling the skip_proba_ itself.
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  }
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  return size;
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}
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// Collect statistics and deduce probabilities for next coding pass.
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// Return the total bit-cost for coding the probability updates.
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static int CalcTokenProba(int nb, int total) {
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  assert(nb <= total);
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  return nb ? (255 - nb * 255 / total) : 255;
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}
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// Cost of coding 'nb' 1's and 'total-nb' 0's using 'proba' probability.
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static int BranchCost(int nb, int total, int proba) {
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  return nb * VP8BitCost(1, proba) + (total - nb) * VP8BitCost(0, proba);
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}
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static void ResetTokenStats(VP8Encoder* const enc) {
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  VP8EncProba* const proba = &enc->proba_;
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  memset(proba->stats_, 0, sizeof(proba->stats_));
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}
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static int FinalizeTokenProbas(VP8EncProba* const proba) {
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  int has_changed = 0;
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  int size = 0;
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  int t, b, c, p;
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  for (t = 0; t < NUM_TYPES; ++t) {
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    for (b = 0; b < NUM_BANDS; ++b) {
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      for (c = 0; c < NUM_CTX; ++c) {
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        for (p = 0; p < NUM_PROBAS; ++p) {
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          const proba_t stats = proba->stats_[t][b][c][p];
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          const int nb = (stats >> 0) & 0xffff;
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          const int total = (stats >> 16) & 0xffff;
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          const int update_proba = VP8CoeffsUpdateProba[t][b][c][p];
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          const int old_p = VP8CoeffsProba0[t][b][c][p];
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          const int new_p = CalcTokenProba(nb, total);
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          const int old_cost = BranchCost(nb, total, old_p)
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                             + VP8BitCost(0, update_proba);
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          const int new_cost = BranchCost(nb, total, new_p)
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                             + VP8BitCost(1, update_proba)
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                             + 8 * 256;
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          const int use_new_p = (old_cost > new_cost);
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          size += VP8BitCost(use_new_p, update_proba);
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          if (use_new_p) {  // only use proba that seem meaningful enough.
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            proba->coeffs_[t][b][c][p] = new_p;
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            has_changed |= (new_p != old_p);
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            size += 8 * 256;
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          } else {
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            proba->coeffs_[t][b][c][p] = old_p;
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          }
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        }
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      }
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    }
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  }
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  proba->dirty_ = has_changed;
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  return size;
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}
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//------------------------------------------------------------------------------
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// Finalize Segment probability based on the coding tree
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static int GetProba(int a, int b) {
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  const int total = a + b;
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  return (total == 0) ? 255     // that's the default probability.
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                      : (255 * a + total / 2) / total;  // rounded proba
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}
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static void ResetSegments(VP8Encoder* const enc) {
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  int n;
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  for (n = 0; n < enc->mb_w_ * enc->mb_h_; ++n) {
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    enc->mb_info_[n].segment_ = 0;
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  }
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}
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static void SetSegmentProbas(VP8Encoder* const enc) {
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  int p[NUM_MB_SEGMENTS] = { 0 };
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  int n;
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  for (n = 0; n < enc->mb_w_ * enc->mb_h_; ++n) {
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    const VP8MBInfo* const mb = &enc->mb_info_[n];
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    ++p[mb->segment_];
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  }
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#if !defined(WEBP_DISABLE_STATS)
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  if (enc->pic_->stats != NULL) {
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    for (n = 0; n < NUM_MB_SEGMENTS; ++n) {
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      enc->pic_->stats->segment_size[n] = p[n];
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    }
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  }
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#endif
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  if (enc->segment_hdr_.num_segments_ > 1) {
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    uint8_t* const probas = enc->proba_.segments_;
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    probas[0] = GetProba(p[0] + p[1], p[2] + p[3]);
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    probas[1] = GetProba(p[0], p[1]);
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    probas[2] = GetProba(p[2], p[3]);
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    enc->segment_hdr_.update_map_ =
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        (probas[0] != 255) || (probas[1] != 255) || (probas[2] != 255);
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    if (!enc->segment_hdr_.update_map_) ResetSegments(enc);
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    enc->segment_hdr_.size_ =
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        p[0] * (VP8BitCost(0, probas[0]) + VP8BitCost(0, probas[1])) +
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        p[1] * (VP8BitCost(0, probas[0]) + VP8BitCost(1, probas[1])) +
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        p[2] * (VP8BitCost(1, probas[0]) + VP8BitCost(0, probas[2])) +
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        p[3] * (VP8BitCost(1, probas[0]) + VP8BitCost(1, probas[2]));
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  } else {
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    enc->segment_hdr_.update_map_ = 0;
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    enc->segment_hdr_.size_ = 0;
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  }
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}
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//------------------------------------------------------------------------------
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// Coefficient coding
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static int PutCoeffs(VP8BitWriter* const bw, int ctx, const VP8Residual* res) {
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  int n = res->first;
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  // should be prob[VP8EncBands[n]], but it's equivalent for n=0 or 1
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  const uint8_t* p = res->prob[n][ctx];
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  if (!VP8PutBit(bw, res->last >= 0, p[0])) {
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    return 0;
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  }
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  while (n < 16) {
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    const int c = res->coeffs[n++];
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    const int sign = c < 0;
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    int v = sign ? -c : c;
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    if (!VP8PutBit(bw, v != 0, p[1])) {
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      p = res->prob[VP8EncBands[n]][0];
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      continue;
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    }
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    if (!VP8PutBit(bw, v > 1, p[2])) {
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      p = res->prob[VP8EncBands[n]][1];
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    } else {
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      if (!VP8PutBit(bw, v > 4, p[3])) {
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        if (VP8PutBit(bw, v != 2, p[4])) {
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          VP8PutBit(bw, v == 4, p[5]);
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        }
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      } else if (!VP8PutBit(bw, v > 10, p[6])) {
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        if (!VP8PutBit(bw, v > 6, p[7])) {
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          VP8PutBit(bw, v == 6, 159);
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        } else {
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          VP8PutBit(bw, v >= 9, 165);
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          VP8PutBit(bw, !(v & 1), 145);
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        }
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      } else {
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        int mask;
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        const uint8_t* tab;
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        if (v < 3 + (8 << 1)) {          // VP8Cat3  (3b)
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          VP8PutBit(bw, 0, p[8]);
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          VP8PutBit(bw, 0, p[9]);
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          v -= 3 + (8 << 0);
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          mask = 1 << 2;
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          tab = VP8Cat3;
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        } else if (v < 3 + (8 << 2)) {   // VP8Cat4  (4b)
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          VP8PutBit(bw, 0, p[8]);
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          VP8PutBit(bw, 1, p[9]);
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          v -= 3 + (8 << 1);
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          mask = 1 << 3;
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          tab = VP8Cat4;
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        } else if (v < 3 + (8 << 3)) {   // VP8Cat5  (5b)
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          VP8PutBit(bw, 1, p[8]);
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          VP8PutBit(bw, 0, p[10]);
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          v -= 3 + (8 << 2);
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          mask = 1 << 4;
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          tab = VP8Cat5;
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        } else {                         // VP8Cat6 (11b)
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          VP8PutBit(bw, 1, p[8]);
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          VP8PutBit(bw, 1, p[10]);
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          v -= 3 + (8 << 3);
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          mask = 1 << 10;
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          tab = VP8Cat6;
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        }
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        while (mask) {
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          VP8PutBit(bw, !!(v & mask), *tab++);
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          mask >>= 1;
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        }
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      }
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      p = res->prob[VP8EncBands[n]][2];
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    }
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    VP8PutBitUniform(bw, sign);
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    if (n == 16 || !VP8PutBit(bw, n <= res->last, p[0])) {
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      return 1;   // EOB
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    }
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  }
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  return 1;
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}
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static void CodeResiduals(VP8BitWriter* const bw, VP8EncIterator* const it,
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                          const VP8ModeScore* const rd) {
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  int x, y, ch;
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  VP8Residual res;
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  uint64_t pos1, pos2, pos3;
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  const int i16 = (it->mb_->type_ == 1);
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  const int segment = it->mb_->segment_;
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  VP8Encoder* const enc = it->enc_;
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  VP8IteratorNzToBytes(it);
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  pos1 = VP8BitWriterPos(bw);
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  if (i16) {
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    VP8InitResidual(0, 1, enc, &res;;
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    VP8SetResidualCoeffs(rd->y_dc_levels, &res;;
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    it->top_nz_[8] = it->left_nz_[8] =
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      PutCoeffs(bw, it->top_nz_[8] + it->left_nz_[8], &res;;
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    VP8InitResidual(1, 0, enc, &res;;
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  } else {
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    VP8InitResidual(0, 3, enc, &res;;
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  }
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  // luma-AC
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  for (y = 0; y < 4; ++y) {
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    for (x = 0; x < 4; ++x) {
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      const int ctx = it->top_nz_[x] + it->left_nz_[y];
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      VP8SetResidualCoeffs(rd->y_ac_levels[x + y * 4], &res;;
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      it->top_nz_[x] = it->left_nz_[y] = PutCoeffs(bw, ctx, &res;;
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    }
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  }
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  pos2 = VP8BitWriterPos(bw);
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  // U/V
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  VP8InitResidual(0, 2, enc, &res;;
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  for (ch = 0; ch <= 2; ch += 2) {
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    for (y = 0; y < 2; ++y) {
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      for (x = 0; x < 2; ++x) {
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        const int ctx = it->top_nz_[4 + ch + x] + it->left_nz_[4 + ch + y];
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        VP8SetResidualCoeffs(rd->uv_levels[ch * 2 + x + y * 2], &res;;
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        it->top_nz_[4 + ch + x] = it->left_nz_[4 + ch + y] =
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            PutCoeffs(bw, ctx, &res;;
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      }
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    }
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  }
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  pos3 = VP8BitWriterPos(bw);
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  it->luma_bits_ = pos2 - pos1;
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  it->uv_bits_ = pos3 - pos2;
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  it->bit_count_[segment][i16] += it->luma_bits_;
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  it->bit_count_[segment][2] += it->uv_bits_;
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  VP8IteratorBytesToNz(it);
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}
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// Same as CodeResiduals, but doesn't actually write anything.
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// Instead, it just records the event distribution.
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static void RecordResiduals(VP8EncIterator* const it,
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                            const VP8ModeScore* const rd) {
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  int x, y, ch;
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  VP8Residual res;
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  VP8Encoder* const enc = it->enc_;
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  VP8IteratorNzToBytes(it);
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  if (it->mb_->type_ == 1) {   // i16x16
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    VP8InitResidual(0, 1, enc, &res;;
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    VP8SetResidualCoeffs(rd->y_dc_levels, &res;;
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    it->top_nz_[8] = it->left_nz_[8] =
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      VP8RecordCoeffs(it->top_nz_[8] + it->left_nz_[8], &res;;
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    VP8InitResidual(1, 0, enc, &res;;
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  } else {
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    VP8InitResidual(0, 3, enc, &res;;
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  }
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  // luma-AC
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  for (y = 0; y < 4; ++y) {
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    for (x = 0; x < 4; ++x) {
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      const int ctx = it->top_nz_[x] + it->left_nz_[y];
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      VP8SetResidualCoeffs(rd->y_ac_levels[x + y * 4], &res;;
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      it->top_nz_[x] = it->left_nz_[y] = VP8RecordCoeffs(ctx, &res;;
Packit 9c6abc
    }
Packit 9c6abc
  }
Packit 9c6abc
Packit 9c6abc
  // U/V
Packit 9c6abc
  VP8InitResidual(0, 2, enc, &res;;
Packit 9c6abc
  for (ch = 0; ch <= 2; ch += 2) {
Packit 9c6abc
    for (y = 0; y < 2; ++y) {
Packit 9c6abc
      for (x = 0; x < 2; ++x) {
Packit 9c6abc
        const int ctx = it->top_nz_[4 + ch + x] + it->left_nz_[4 + ch + y];
Packit 9c6abc
        VP8SetResidualCoeffs(rd->uv_levels[ch * 2 + x + y * 2], &res;;
Packit 9c6abc
        it->top_nz_[4 + ch + x] = it->left_nz_[4 + ch + y] =
Packit 9c6abc
            VP8RecordCoeffs(ctx, &res;;
Packit 9c6abc
      }
Packit 9c6abc
    }
Packit 9c6abc
  }
Packit 9c6abc
Packit 9c6abc
  VP8IteratorBytesToNz(it);
Packit 9c6abc
}
Packit 9c6abc
Packit 9c6abc
//------------------------------------------------------------------------------
Packit 9c6abc
// Token buffer
Packit 9c6abc
Packit 9c6abc
#if !defined(DISABLE_TOKEN_BUFFER)
Packit 9c6abc
Packit 9c6abc
static int RecordTokens(VP8EncIterator* const it, const VP8ModeScore* const rd,
Packit 9c6abc
                        VP8TBuffer* const tokens) {
Packit 9c6abc
  int x, y, ch;
Packit 9c6abc
  VP8Residual res;
Packit 9c6abc
  VP8Encoder* const enc = it->enc_;
Packit 9c6abc
Packit 9c6abc
  VP8IteratorNzToBytes(it);
Packit 9c6abc
  if (it->mb_->type_ == 1) {   // i16x16
Packit 9c6abc
    const int ctx = it->top_nz_[8] + it->left_nz_[8];
Packit 9c6abc
    VP8InitResidual(0, 1, enc, &res;;
Packit 9c6abc
    VP8SetResidualCoeffs(rd->y_dc_levels, &res;;
Packit 9c6abc
    it->top_nz_[8] = it->left_nz_[8] =
Packit 9c6abc
        VP8RecordCoeffTokens(ctx, &res, tokens);
Packit 9c6abc
    VP8InitResidual(1, 0, enc, &res;;
Packit 9c6abc
  } else {
Packit 9c6abc
    VP8InitResidual(0, 3, enc, &res;;
Packit 9c6abc
  }
Packit 9c6abc
Packit 9c6abc
  // luma-AC
Packit 9c6abc
  for (y = 0; y < 4; ++y) {
Packit 9c6abc
    for (x = 0; x < 4; ++x) {
Packit 9c6abc
      const int ctx = it->top_nz_[x] + it->left_nz_[y];
Packit 9c6abc
      VP8SetResidualCoeffs(rd->y_ac_levels[x + y * 4], &res;;
Packit 9c6abc
      it->top_nz_[x] = it->left_nz_[y] =
Packit 9c6abc
          VP8RecordCoeffTokens(ctx, &res, tokens);
Packit 9c6abc
    }
Packit 9c6abc
  }
Packit 9c6abc
Packit 9c6abc
  // U/V
Packit 9c6abc
  VP8InitResidual(0, 2, enc, &res;;
Packit 9c6abc
  for (ch = 0; ch <= 2; ch += 2) {
Packit 9c6abc
    for (y = 0; y < 2; ++y) {
Packit 9c6abc
      for (x = 0; x < 2; ++x) {
Packit 9c6abc
        const int ctx = it->top_nz_[4 + ch + x] + it->left_nz_[4 + ch + y];
Packit 9c6abc
        VP8SetResidualCoeffs(rd->uv_levels[ch * 2 + x + y * 2], &res;;
Packit 9c6abc
        it->top_nz_[4 + ch + x] = it->left_nz_[4 + ch + y] =
Packit 9c6abc
            VP8RecordCoeffTokens(ctx, &res, tokens);
Packit 9c6abc
      }
Packit 9c6abc
    }
Packit 9c6abc
  }
Packit 9c6abc
  VP8IteratorBytesToNz(it);
Packit 9c6abc
  return !tokens->error_;
Packit 9c6abc
}
Packit 9c6abc
Packit 9c6abc
#endif    // !DISABLE_TOKEN_BUFFER
Packit 9c6abc
Packit 9c6abc
//------------------------------------------------------------------------------
Packit 9c6abc
// ExtraInfo map / Debug function
Packit 9c6abc
Packit 9c6abc
#if !defined(WEBP_DISABLE_STATS)
Packit 9c6abc
Packit 9c6abc
#if SEGMENT_VISU
Packit 9c6abc
static void SetBlock(uint8_t* p, int value, int size) {
Packit 9c6abc
  int y;
Packit 9c6abc
  for (y = 0; y < size; ++y) {
Packit 9c6abc
    memset(p, value, size);
Packit 9c6abc
    p += BPS;
Packit 9c6abc
  }
Packit 9c6abc
}
Packit 9c6abc
#endif
Packit 9c6abc
Packit 9c6abc
static void ResetSSE(VP8Encoder* const enc) {
Packit 9c6abc
  enc->sse_[0] = 0;
Packit 9c6abc
  enc->sse_[1] = 0;
Packit 9c6abc
  enc->sse_[2] = 0;
Packit 9c6abc
  // Note: enc->sse_[3] is managed by alpha.c
Packit 9c6abc
  enc->sse_count_ = 0;
Packit 9c6abc
}
Packit 9c6abc
Packit 9c6abc
static void StoreSSE(const VP8EncIterator* const it) {
Packit 9c6abc
  VP8Encoder* const enc = it->enc_;
Packit 9c6abc
  const uint8_t* const in = it->yuv_in_;
Packit 9c6abc
  const uint8_t* const out = it->yuv_out_;
Packit 9c6abc
  // Note: not totally accurate at boundary. And doesn't include in-loop filter.
Packit 9c6abc
  enc->sse_[0] += VP8SSE16x16(in + Y_OFF_ENC, out + Y_OFF_ENC);
Packit 9c6abc
  enc->sse_[1] += VP8SSE8x8(in + U_OFF_ENC, out + U_OFF_ENC);
Packit 9c6abc
  enc->sse_[2] += VP8SSE8x8(in + V_OFF_ENC, out + V_OFF_ENC);
Packit 9c6abc
  enc->sse_count_ += 16 * 16;
Packit 9c6abc
}
Packit 9c6abc
Packit 9c6abc
static void StoreSideInfo(const VP8EncIterator* const it) {
Packit 9c6abc
  VP8Encoder* const enc = it->enc_;
Packit 9c6abc
  const VP8MBInfo* const mb = it->mb_;
Packit 9c6abc
  WebPPicture* const pic = enc->pic_;
Packit 9c6abc
Packit 9c6abc
  if (pic->stats != NULL) {
Packit 9c6abc
    StoreSSE(it);
Packit 9c6abc
    enc->block_count_[0] += (mb->type_ == 0);
Packit 9c6abc
    enc->block_count_[1] += (mb->type_ == 1);
Packit 9c6abc
    enc->block_count_[2] += (mb->skip_ != 0);
Packit 9c6abc
  }
Packit 9c6abc
Packit 9c6abc
  if (pic->extra_info != NULL) {
Packit 9c6abc
    uint8_t* const info = &pic->extra_info[it->x_ + it->y_ * enc->mb_w_];
Packit 9c6abc
    switch (pic->extra_info_type) {
Packit 9c6abc
      case 1: *info = mb->type_; break;
Packit 9c6abc
      case 2: *info = mb->segment_; break;
Packit 9c6abc
      case 3: *info = enc->dqm_[mb->segment_].quant_; break;
Packit 9c6abc
      case 4: *info = (mb->type_ == 1) ? it->preds_[0] : 0xff; break;
Packit 9c6abc
      case 5: *info = mb->uv_mode_; break;
Packit 9c6abc
      case 6: {
Packit 9c6abc
        const int b = (int)((it->luma_bits_ + it->uv_bits_ + 7) >> 3);
Packit 9c6abc
        *info = (b > 255) ? 255 : b; break;
Packit 9c6abc
      }
Packit 9c6abc
      case 7: *info = mb->alpha_; break;
Packit 9c6abc
      default: *info = 0; break;
Packit 9c6abc
    }
Packit 9c6abc
  }
Packit 9c6abc
#if SEGMENT_VISU  // visualize segments and prediction modes
Packit 9c6abc
  SetBlock(it->yuv_out_ + Y_OFF_ENC, mb->segment_ * 64, 16);
Packit 9c6abc
  SetBlock(it->yuv_out_ + U_OFF_ENC, it->preds_[0] * 64, 8);
Packit 9c6abc
  SetBlock(it->yuv_out_ + V_OFF_ENC, mb->uv_mode_ * 64, 8);
Packit 9c6abc
#endif
Packit 9c6abc
}
Packit 9c6abc
Packit 9c6abc
static void ResetSideInfo(const VP8EncIterator* const it) {
Packit 9c6abc
  VP8Encoder* const enc = it->enc_;
Packit 9c6abc
  WebPPicture* const pic = enc->pic_;
Packit 9c6abc
  if (pic->stats != NULL) {
Packit 9c6abc
    memset(enc->block_count_, 0, sizeof(enc->block_count_));
Packit 9c6abc
  }
Packit 9c6abc
  ResetSSE(enc);
Packit 9c6abc
}
Packit 9c6abc
#else  // defined(WEBP_DISABLE_STATS)
Packit 9c6abc
static void ResetSSE(VP8Encoder* const enc) {
Packit 9c6abc
  (void)enc;
Packit 9c6abc
}
Packit 9c6abc
static void StoreSideInfo(const VP8EncIterator* const it) {
Packit 9c6abc
  VP8Encoder* const enc = it->enc_;
Packit 9c6abc
  WebPPicture* const pic = enc->pic_;
Packit 9c6abc
  if (pic->extra_info != NULL) {
Packit 9c6abc
    if (it->x_ == 0 && it->y_ == 0) {   // only do it once, at start
Packit 9c6abc
      memset(pic->extra_info, 0,
Packit 9c6abc
             enc->mb_w_ * enc->mb_h_ * sizeof(*pic->extra_info));
Packit 9c6abc
    }
Packit 9c6abc
  }
Packit 9c6abc
}
Packit 9c6abc
Packit 9c6abc
static void ResetSideInfo(const VP8EncIterator* const it) {
Packit 9c6abc
  (void)it;
Packit 9c6abc
}
Packit 9c6abc
#endif  // !defined(WEBP_DISABLE_STATS)
Packit 9c6abc
Packit 9c6abc
static double GetPSNR(uint64_t mse, uint64_t size) {
Packit 9c6abc
  return (mse > 0 && size > 0) ? 10. * log10(255. * 255. * size / mse) : 99;
Packit 9c6abc
}
Packit 9c6abc
Packit 9c6abc
//------------------------------------------------------------------------------
Packit 9c6abc
//  StatLoop(): only collect statistics (number of skips, token usage, ...).
Packit 9c6abc
//  This is used for deciding optimal probabilities. It also modifies the
Packit 9c6abc
//  quantizer value if some target (size, PSNR) was specified.
Packit 9c6abc
Packit 9c6abc
static void SetLoopParams(VP8Encoder* const enc, float q) {
Packit 9c6abc
  // Make sure the quality parameter is inside valid bounds
Packit 9c6abc
  q = Clamp(q, 0.f, 100.f);
Packit 9c6abc
Packit 9c6abc
  VP8SetSegmentParams(enc, q);      // setup segment quantizations and filters
Packit 9c6abc
  SetSegmentProbas(enc);            // compute segment probabilities
Packit 9c6abc
Packit 9c6abc
  ResetStats(enc);
Packit 9c6abc
  ResetSSE(enc);
Packit 9c6abc
}
Packit 9c6abc
Packit 9c6abc
static uint64_t OneStatPass(VP8Encoder* const enc, VP8RDLevel rd_opt,
Packit 9c6abc
                            int nb_mbs, int percent_delta,
Packit 9c6abc
                            PassStats* const s) {
Packit 9c6abc
  VP8EncIterator it;
Packit 9c6abc
  uint64_t size = 0;
Packit 9c6abc
  uint64_t size_p0 = 0;
Packit 9c6abc
  uint64_t distortion = 0;
Packit 9c6abc
  const uint64_t pixel_count = nb_mbs * 384;
Packit 9c6abc
Packit 9c6abc
  VP8IteratorInit(enc, &it);
Packit 9c6abc
  SetLoopParams(enc, s->q);
Packit 9c6abc
  do {
Packit 9c6abc
    VP8ModeScore info;
Packit 9c6abc
    VP8IteratorImport(&it, NULL);
Packit 9c6abc
    if (VP8Decimate(&it, &info, rd_opt)) {
Packit 9c6abc
      // Just record the number of skips and act like skip_proba is not used.
Packit 9c6abc
      ++enc->proba_.nb_skip_;
Packit 9c6abc
    }
Packit 9c6abc
    RecordResiduals(&it, &info;;
Packit 9c6abc
    size += info.R + info.H;
Packit 9c6abc
    size_p0 += info.H;
Packit 9c6abc
    distortion += info.D;
Packit 9c6abc
    if (percent_delta && !VP8IteratorProgress(&it, percent_delta)) {
Packit 9c6abc
      return 0;
Packit 9c6abc
    }
Packit 9c6abc
    VP8IteratorSaveBoundary(&it);
Packit 9c6abc
  } while (VP8IteratorNext(&it) && --nb_mbs > 0);
Packit 9c6abc
Packit 9c6abc
  size_p0 += enc->segment_hdr_.size_;
Packit 9c6abc
  if (s->do_size_search) {
Packit 9c6abc
    size += FinalizeSkipProba(enc);
Packit 9c6abc
    size += FinalizeTokenProbas(&enc->proba_);
Packit 9c6abc
    size = ((size + size_p0 + 1024) >> 11) + HEADER_SIZE_ESTIMATE;
Packit 9c6abc
    s->value = (double)size;
Packit 9c6abc
  } else {
Packit 9c6abc
    s->value = GetPSNR(distortion, pixel_count);
Packit 9c6abc
  }
Packit 9c6abc
  return size_p0;
Packit 9c6abc
}
Packit 9c6abc
Packit 9c6abc
static int StatLoop(VP8Encoder* const enc) {
Packit 9c6abc
  const int method = enc->method_;
Packit 9c6abc
  const int do_search = enc->do_search_;
Packit 9c6abc
  const int fast_probe = ((method == 0 || method == 3) && !do_search);
Packit 9c6abc
  int num_pass_left = enc->config_->pass;
Packit 9c6abc
  const int task_percent = 20;
Packit 9c6abc
  const int percent_per_pass =
Packit 9c6abc
      (task_percent + num_pass_left / 2) / num_pass_left;
Packit 9c6abc
  const int final_percent = enc->percent_ + task_percent;
Packit 9c6abc
  const VP8RDLevel rd_opt =
Packit 9c6abc
      (method >= 3 || do_search) ? RD_OPT_BASIC : RD_OPT_NONE;
Packit 9c6abc
  int nb_mbs = enc->mb_w_ * enc->mb_h_;
Packit 9c6abc
  PassStats stats;
Packit 9c6abc
Packit 9c6abc
  InitPassStats(enc, &stats);
Packit 9c6abc
  ResetTokenStats(enc);
Packit 9c6abc
Packit 9c6abc
  // Fast mode: quick analysis pass over few mbs. Better than nothing.
Packit 9c6abc
  if (fast_probe) {
Packit 9c6abc
    if (method == 3) {  // we need more stats for method 3 to be reliable.
Packit 9c6abc
      nb_mbs = (nb_mbs > 200) ? nb_mbs >> 1 : 100;
Packit 9c6abc
    } else {
Packit 9c6abc
      nb_mbs = (nb_mbs > 200) ? nb_mbs >> 2 : 50;
Packit 9c6abc
    }
Packit 9c6abc
  }
Packit 9c6abc
Packit 9c6abc
  while (num_pass_left-- > 0) {
Packit 9c6abc
    const int is_last_pass = (fabs(stats.dq) <= DQ_LIMIT) ||
Packit 9c6abc
                             (num_pass_left == 0) ||
Packit 9c6abc
                             (enc->max_i4_header_bits_ == 0);
Packit 9c6abc
    const uint64_t size_p0 =
Packit 9c6abc
        OneStatPass(enc, rd_opt, nb_mbs, percent_per_pass, &stats);
Packit 9c6abc
    if (size_p0 == 0) return 0;
Packit 9c6abc
#if (DEBUG_SEARCH > 0)
Packit 9c6abc
    printf("#%d value:%.1lf -> %.1lf   q:%.2f -> %.2f\n",
Packit 9c6abc
           num_pass_left, stats.last_value, stats.value, stats.last_q, stats.q);
Packit 9c6abc
#endif
Packit 9c6abc
    if (enc->max_i4_header_bits_ > 0 && size_p0 > PARTITION0_SIZE_LIMIT) {
Packit 9c6abc
      ++num_pass_left;
Packit 9c6abc
      enc->max_i4_header_bits_ >>= 1;  // strengthen header bit limitation...
Packit 9c6abc
      continue;                        // ...and start over
Packit 9c6abc
    }
Packit 9c6abc
    if (is_last_pass) {
Packit 9c6abc
      break;
Packit 9c6abc
    }
Packit 9c6abc
    // If no target size: just do several pass without changing 'q'
Packit 9c6abc
    if (do_search) {
Packit 9c6abc
      ComputeNextQ(&stats);
Packit 9c6abc
      if (fabs(stats.dq) <= DQ_LIMIT) break;
Packit 9c6abc
    }
Packit 9c6abc
  }
Packit 9c6abc
  if (!do_search || !stats.do_size_search) {
Packit 9c6abc
    // Need to finalize probas now, since it wasn't done during the search.
Packit 9c6abc
    FinalizeSkipProba(enc);
Packit 9c6abc
    FinalizeTokenProbas(&enc->proba_);
Packit 9c6abc
  }
Packit 9c6abc
  VP8CalculateLevelCosts(&enc->proba_);  // finalize costs
Packit 9c6abc
  return WebPReportProgress(enc->pic_, final_percent, &enc->percent_);
Packit 9c6abc
}
Packit 9c6abc
Packit 9c6abc
//------------------------------------------------------------------------------
Packit 9c6abc
// Main loops
Packit 9c6abc
//
Packit 9c6abc
Packit 9c6abc
static const uint8_t kAverageBytesPerMB[8] = { 50, 24, 16, 9, 7, 5, 3, 2 };
Packit 9c6abc
Packit 9c6abc
static int PreLoopInitialize(VP8Encoder* const enc) {
Packit 9c6abc
  int p;
Packit 9c6abc
  int ok = 1;
Packit 9c6abc
  const int average_bytes_per_MB = kAverageBytesPerMB[enc->base_quant_ >> 4];
Packit 9c6abc
  const int bytes_per_parts =
Packit 9c6abc
      enc->mb_w_ * enc->mb_h_ * average_bytes_per_MB / enc->num_parts_;
Packit 9c6abc
  // Initialize the bit-writers
Packit 9c6abc
  for (p = 0; ok && p < enc->num_parts_; ++p) {
Packit 9c6abc
    ok = VP8BitWriterInit(enc->parts_ + p, bytes_per_parts);
Packit 9c6abc
  }
Packit 9c6abc
  if (!ok) {
Packit 9c6abc
    VP8EncFreeBitWriters(enc);  // malloc error occurred
Packit 9c6abc
    WebPEncodingSetError(enc->pic_, VP8_ENC_ERROR_OUT_OF_MEMORY);
Packit 9c6abc
  }
Packit 9c6abc
  return ok;
Packit 9c6abc
}
Packit 9c6abc
Packit 9c6abc
static int PostLoopFinalize(VP8EncIterator* const it, int ok) {
Packit 9c6abc
  VP8Encoder* const enc = it->enc_;
Packit 9c6abc
  if (ok) {      // Finalize the partitions, check for extra errors.
Packit 9c6abc
    int p;
Packit 9c6abc
    for (p = 0; p < enc->num_parts_; ++p) {
Packit 9c6abc
      VP8BitWriterFinish(enc->parts_ + p);
Packit 9c6abc
      ok &= !enc->parts_[p].error_;
Packit 9c6abc
    }
Packit 9c6abc
  }
Packit 9c6abc
Packit 9c6abc
  if (ok) {      // All good. Finish up.
Packit 9c6abc
#if !defined(WEBP_DISABLE_STATS)
Packit 9c6abc
    if (enc->pic_->stats != NULL) {  // finalize byte counters...
Packit 9c6abc
      int i, s;
Packit 9c6abc
      for (i = 0; i <= 2; ++i) {
Packit 9c6abc
        for (s = 0; s < NUM_MB_SEGMENTS; ++s) {
Packit 9c6abc
          enc->residual_bytes_[i][s] = (int)((it->bit_count_[s][i] + 7) >> 3);
Packit 9c6abc
        }
Packit 9c6abc
      }
Packit 9c6abc
    }
Packit 9c6abc
#endif
Packit 9c6abc
    VP8AdjustFilterStrength(it);     // ...and store filter stats.
Packit 9c6abc
  } else {
Packit 9c6abc
    // Something bad happened -> need to do some memory cleanup.
Packit 9c6abc
    VP8EncFreeBitWriters(enc);
Packit 9c6abc
  }
Packit 9c6abc
  return ok;
Packit 9c6abc
}
Packit 9c6abc
Packit 9c6abc
//------------------------------------------------------------------------------
Packit 9c6abc
//  VP8EncLoop(): does the final bitstream coding.
Packit 9c6abc
Packit 9c6abc
static void ResetAfterSkip(VP8EncIterator* const it) {
Packit 9c6abc
  if (it->mb_->type_ == 1) {
Packit 9c6abc
    *it->nz_ = 0;  // reset all predictors
Packit 9c6abc
    it->left_nz_[8] = 0;
Packit 9c6abc
  } else {
Packit 9c6abc
    *it->nz_ &= (1 << 24);  // preserve the dc_nz bit
Packit 9c6abc
  }
Packit 9c6abc
}
Packit 9c6abc
Packit 9c6abc
int VP8EncLoop(VP8Encoder* const enc) {
Packit 9c6abc
  VP8EncIterator it;
Packit 9c6abc
  int ok = PreLoopInitialize(enc);
Packit 9c6abc
  if (!ok) return 0;
Packit 9c6abc
Packit 9c6abc
  StatLoop(enc);  // stats-collection loop
Packit 9c6abc
Packit 9c6abc
  VP8IteratorInit(enc, &it);
Packit 9c6abc
  VP8InitFilter(&it);
Packit 9c6abc
  do {
Packit 9c6abc
    VP8ModeScore info;
Packit 9c6abc
    const int dont_use_skip = !enc->proba_.use_skip_proba_;
Packit 9c6abc
    const VP8RDLevel rd_opt = enc->rd_opt_level_;
Packit 9c6abc
Packit 9c6abc
    VP8IteratorImport(&it, NULL);
Packit 9c6abc
    // Warning! order is important: first call VP8Decimate() and
Packit 9c6abc
    // *then* decide how to code the skip decision if there's one.
Packit 9c6abc
    if (!VP8Decimate(&it, &info, rd_opt) || dont_use_skip) {
Packit 9c6abc
      CodeResiduals(it.bw_, &it, &info;;
Packit 9c6abc
    } else {   // reset predictors after a skip
Packit 9c6abc
      ResetAfterSkip(&it);
Packit 9c6abc
    }
Packit 9c6abc
    StoreSideInfo(&it);
Packit 9c6abc
    VP8StoreFilterStats(&it);
Packit 9c6abc
    VP8IteratorExport(&it);
Packit 9c6abc
    ok = VP8IteratorProgress(&it, 20);
Packit 9c6abc
    VP8IteratorSaveBoundary(&it);
Packit 9c6abc
  } while (ok && VP8IteratorNext(&it);;
Packit 9c6abc
Packit 9c6abc
  return PostLoopFinalize(&it, ok);
Packit 9c6abc
}
Packit 9c6abc
Packit 9c6abc
//------------------------------------------------------------------------------
Packit 9c6abc
// Single pass using Token Buffer.
Packit 9c6abc
Packit 9c6abc
#if !defined(DISABLE_TOKEN_BUFFER)
Packit 9c6abc
Packit 9c6abc
#define MIN_COUNT 96  // minimum number of macroblocks before updating stats
Packit 9c6abc
Packit 9c6abc
int VP8EncTokenLoop(VP8Encoder* const enc) {
Packit 9c6abc
  // Roughly refresh the proba eight times per pass
Packit 9c6abc
  int max_count = (enc->mb_w_ * enc->mb_h_) >> 3;
Packit 9c6abc
  int num_pass_left = enc->config_->pass;
Packit 9c6abc
  const int do_search = enc->do_search_;
Packit 9c6abc
  VP8EncIterator it;
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  VP8EncProba* const proba = &enc->proba_;
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  const VP8RDLevel rd_opt = enc->rd_opt_level_;
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  const uint64_t pixel_count = enc->mb_w_ * enc->mb_h_ * 384;
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  PassStats stats;
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  int ok;
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  InitPassStats(enc, &stats);
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  ok = PreLoopInitialize(enc);
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  if (!ok) return 0;
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  if (max_count < MIN_COUNT) max_count = MIN_COUNT;
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  assert(enc->num_parts_ == 1);
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  assert(enc->use_tokens_);
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  assert(proba->use_skip_proba_ == 0);
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  assert(rd_opt >= RD_OPT_BASIC);   // otherwise, token-buffer won't be useful
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  assert(num_pass_left > 0);
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  while (ok && num_pass_left-- > 0) {
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    const int is_last_pass = (fabs(stats.dq) <= DQ_LIMIT) ||
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                             (num_pass_left == 0) ||
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                             (enc->max_i4_header_bits_ == 0);
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    uint64_t size_p0 = 0;
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    uint64_t distortion = 0;
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    int cnt = max_count;
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    VP8IteratorInit(enc, &it);
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    SetLoopParams(enc, stats.q);
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    if (is_last_pass) {
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      ResetTokenStats(enc);
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      VP8InitFilter(&it);  // don't collect stats until last pass (too costly)
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    }
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    VP8TBufferClear(&enc->tokens_);
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    do {
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      VP8ModeScore info;
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      VP8IteratorImport(&it, NULL);
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      if (--cnt < 0) {
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        FinalizeTokenProbas(proba);
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        VP8CalculateLevelCosts(proba);  // refresh cost tables for rd-opt
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        cnt = max_count;
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      }
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      VP8Decimate(&it, &info, rd_opt);
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      ok = RecordTokens(&it, &info, &enc->tokens_);
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      if (!ok) {
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        WebPEncodingSetError(enc->pic_, VP8_ENC_ERROR_OUT_OF_MEMORY);
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        break;
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      }
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      size_p0 += info.H;
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      distortion += info.D;
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      if (is_last_pass) {
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        StoreSideInfo(&it);
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        VP8StoreFilterStats(&it);
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        VP8IteratorExport(&it);
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        ok = VP8IteratorProgress(&it, 20);
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      }
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      VP8IteratorSaveBoundary(&it);
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    } while (ok && VP8IteratorNext(&it);;
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    if (!ok) break;
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    size_p0 += enc->segment_hdr_.size_;
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    if (stats.do_size_search) {
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      uint64_t size = FinalizeTokenProbas(&enc->proba_);
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      size += VP8EstimateTokenSize(&enc->tokens_,
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                                   (const uint8_t*)proba->coeffs_);
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      size = (size + size_p0 + 1024) >> 11;  // -> size in bytes
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      size += HEADER_SIZE_ESTIMATE;
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      stats.value = (double)size;
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    } else {  // compute and store PSNR
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      stats.value = GetPSNR(distortion, pixel_count);
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    }
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#if (DEBUG_SEARCH > 0)
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    printf("#%2d metric:%.1lf -> %.1lf   last_q=%.2lf q=%.2lf dq=%.2lf\n",
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           num_pass_left, stats.last_value, stats.value,
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           stats.last_q, stats.q, stats.dq);
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#endif
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    if (enc->max_i4_header_bits_ > 0 && size_p0 > PARTITION0_SIZE_LIMIT) {
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      ++num_pass_left;
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      enc->max_i4_header_bits_ >>= 1;  // strengthen header bit limitation...
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      if (is_last_pass) {
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        ResetSideInfo(&it);
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      }
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      continue;                        // ...and start over
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    }
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    if (is_last_pass) {
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      break;   // done
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    }
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    if (do_search) {
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      ComputeNextQ(&stats);  // Adjust q
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    }
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  }
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  if (ok) {
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    if (!stats.do_size_search) {
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      FinalizeTokenProbas(&enc->proba_);
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    }
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    ok = VP8EmitTokens(&enc->tokens_, enc->parts_ + 0,
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                       (const uint8_t*)proba->coeffs_, 1);
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  }
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  ok = ok && WebPReportProgress(enc->pic_, enc->percent_ + 20, &enc->percent_);
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  return PostLoopFinalize(&it, ok);
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}
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#else
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int VP8EncTokenLoop(VP8Encoder* const enc) {
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  (void)enc;
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  return 0;   // we shouldn't be here.
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}
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#endif    // DISABLE_TOKEN_BUFFER
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//------------------------------------------------------------------------------