398 lines
13 KiB
C
398 lines
13 KiB
C
// 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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// WebP encoder: main entry point
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//
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// Author: Skal (pascal.massimino@gmail.com)
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#include <assert.h>
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#include <stdlib.h>
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#include <string.h>
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#include <math.h>
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#include "./cost_enc.h"
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#include "./vp8i_enc.h"
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#include "./vp8li_enc.h"
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#include "../utils/utils.h"
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// #define PRINT_MEMORY_INFO
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#ifdef PRINT_MEMORY_INFO
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#include <stdio.h>
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#endif
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//------------------------------------------------------------------------------
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int WebPGetEncoderVersion(void) {
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return (ENC_MAJ_VERSION << 16) | (ENC_MIN_VERSION << 8) | ENC_REV_VERSION;
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}
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//------------------------------------------------------------------------------
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// VP8Encoder
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//------------------------------------------------------------------------------
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static void ResetSegmentHeader(VP8Encoder* const enc) {
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VP8EncSegmentHeader* const hdr = &enc->segment_hdr_;
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hdr->num_segments_ = enc->config_->segments;
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hdr->update_map_ = (hdr->num_segments_ > 1);
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hdr->size_ = 0;
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}
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static void ResetFilterHeader(VP8Encoder* const enc) {
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VP8EncFilterHeader* const hdr = &enc->filter_hdr_;
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hdr->simple_ = 1;
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hdr->level_ = 0;
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hdr->sharpness_ = 0;
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hdr->i4x4_lf_delta_ = 0;
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}
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static void ResetBoundaryPredictions(VP8Encoder* const enc) {
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// init boundary values once for all
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// Note: actually, initializing the preds_[] is only needed for intra4.
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int i;
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uint8_t* const top = enc->preds_ - enc->preds_w_;
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uint8_t* const left = enc->preds_ - 1;
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for (i = -1; i < 4 * enc->mb_w_; ++i) {
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top[i] = B_DC_PRED;
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}
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for (i = 0; i < 4 * enc->mb_h_; ++i) {
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left[i * enc->preds_w_] = B_DC_PRED;
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}
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enc->nz_[-1] = 0; // constant
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}
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// Mapping from config->method_ to coding tools used.
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//-------------------+---+---+---+---+---+---+---+
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// Method | 0 | 1 | 2 | 3 |(4)| 5 | 6 |
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//-------------------+---+---+---+---+---+---+---+
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// fast probe | x | | | x | | | |
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//-------------------+---+---+---+---+---+---+---+
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// dynamic proba | ~ | x | x | x | x | x | x |
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//-------------------+---+---+---+---+---+---+---+
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// fast mode analysis|[x]|[x]| | | x | x | x |
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//-------------------+---+---+---+---+---+---+---+
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// basic rd-opt | | | | x | x | x | x |
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//-------------------+---+---+---+---+---+---+---+
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// disto-refine i4/16| x | x | x | | | | |
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//-------------------+---+---+---+---+---+---+---+
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// disto-refine uv | | x | x | | | | |
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//-------------------+---+---+---+---+---+---+---+
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// rd-opt i4/16 | | | ~ | x | x | x | x |
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//-------------------+---+---+---+---+---+---+---+
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// token buffer (opt)| | | | x | x | x | x |
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//-------------------+---+---+---+---+---+---+---+
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// Trellis | | | | | | x |Ful|
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//-------------------+---+---+---+---+---+---+---+
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// full-SNS | | | | | x | x | x |
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//-------------------+---+---+---+---+---+---+---+
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static void MapConfigToTools(VP8Encoder* const enc) {
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const WebPConfig* const config = enc->config_;
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const int method = config->method;
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const int limit = 100 - config->partition_limit;
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enc->method_ = method;
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enc->rd_opt_level_ = (method >= 6) ? RD_OPT_TRELLIS_ALL
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: (method >= 5) ? RD_OPT_TRELLIS
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: (method >= 3) ? RD_OPT_BASIC
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: RD_OPT_NONE;
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enc->max_i4_header_bits_ =
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256 * 16 * 16 * // upper bound: up to 16bit per 4x4 block
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(limit * limit) / (100 * 100); // ... modulated with a quadratic curve.
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// partition0 = 512k max.
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enc->mb_header_limit_ =
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(score_t)256 * 510 * 8 * 1024 / (enc->mb_w_ * enc->mb_h_);
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enc->thread_level_ = config->thread_level;
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enc->do_search_ = (config->target_size > 0 || config->target_PSNR > 0);
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if (!config->low_memory) {
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#if !defined(DISABLE_TOKEN_BUFFER)
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enc->use_tokens_ = (enc->rd_opt_level_ >= RD_OPT_BASIC); // need rd stats
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#endif
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if (enc->use_tokens_) {
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enc->num_parts_ = 1; // doesn't work with multi-partition
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}
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}
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}
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// Memory scaling with dimensions:
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// memory (bytes) ~= 2.25 * w + 0.0625 * w * h
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//
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// Typical memory footprint (614x440 picture)
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// encoder: 22111
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// info: 4368
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// preds: 17741
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// top samples: 1263
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// non-zero: 175
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// lf-stats: 0
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// total: 45658
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// Transient object sizes:
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// VP8EncIterator: 3360
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// VP8ModeScore: 872
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// VP8SegmentInfo: 732
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// VP8EncProba: 18352
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// LFStats: 2048
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// Picture size (yuv): 419328
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static VP8Encoder* InitVP8Encoder(const WebPConfig* const config,
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WebPPicture* const picture) {
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VP8Encoder* enc;
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const int use_filter =
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(config->filter_strength > 0) || (config->autofilter > 0);
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const int mb_w = (picture->width + 15) >> 4;
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const int mb_h = (picture->height + 15) >> 4;
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const int preds_w = 4 * mb_w + 1;
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const int preds_h = 4 * mb_h + 1;
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const size_t preds_size = preds_w * preds_h * sizeof(*enc->preds_);
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const int top_stride = mb_w * 16;
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const size_t nz_size = (mb_w + 1) * sizeof(*enc->nz_) + WEBP_ALIGN_CST;
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const size_t info_size = mb_w * mb_h * sizeof(*enc->mb_info_);
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const size_t samples_size =
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2 * top_stride * sizeof(*enc->y_top_) // top-luma/u/v
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+ WEBP_ALIGN_CST; // align all
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const size_t lf_stats_size =
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config->autofilter ? sizeof(*enc->lf_stats_) + WEBP_ALIGN_CST : 0;
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uint8_t* mem;
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const uint64_t size = (uint64_t)sizeof(*enc) // main struct
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+ WEBP_ALIGN_CST // cache alignment
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+ info_size // modes info
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+ preds_size // prediction modes
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+ samples_size // top/left samples
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+ nz_size // coeff context bits
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+ lf_stats_size; // autofilter stats
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#ifdef PRINT_MEMORY_INFO
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printf("===================================\n");
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printf("Memory used:\n"
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" encoder: %ld\n"
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" info: %ld\n"
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" preds: %ld\n"
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" top samples: %ld\n"
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" non-zero: %ld\n"
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" lf-stats: %ld\n"
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" total: %ld\n",
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sizeof(*enc) + WEBP_ALIGN_CST, info_size,
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preds_size, samples_size, nz_size, lf_stats_size, size);
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printf("Transient object sizes:\n"
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" VP8EncIterator: %ld\n"
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" VP8ModeScore: %ld\n"
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" VP8SegmentInfo: %ld\n"
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" VP8EncProba: %ld\n"
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" LFStats: %ld\n",
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sizeof(VP8EncIterator), sizeof(VP8ModeScore),
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sizeof(VP8SegmentInfo), sizeof(VP8EncProba),
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sizeof(LFStats));
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printf("Picture size (yuv): %ld\n",
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mb_w * mb_h * 384 * sizeof(uint8_t));
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printf("===================================\n");
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#endif
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mem = (uint8_t*)WebPSafeMalloc(size, sizeof(*mem));
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if (mem == NULL) {
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WebPEncodingSetError(picture, VP8_ENC_ERROR_OUT_OF_MEMORY);
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return NULL;
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}
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enc = (VP8Encoder*)mem;
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mem = (uint8_t*)WEBP_ALIGN(mem + sizeof(*enc));
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memset(enc, 0, sizeof(*enc));
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enc->num_parts_ = 1 << config->partitions;
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enc->mb_w_ = mb_w;
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enc->mb_h_ = mb_h;
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enc->preds_w_ = preds_w;
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enc->mb_info_ = (VP8MBInfo*)mem;
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mem += info_size;
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enc->preds_ = ((uint8_t*)mem) + 1 + enc->preds_w_;
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mem += preds_size;
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enc->nz_ = 1 + (uint32_t*)WEBP_ALIGN(mem);
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mem += nz_size;
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enc->lf_stats_ = lf_stats_size ? (LFStats*)WEBP_ALIGN(mem) : NULL;
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mem += lf_stats_size;
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// top samples (all 16-aligned)
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mem = (uint8_t*)WEBP_ALIGN(mem);
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enc->y_top_ = (uint8_t*)mem;
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enc->uv_top_ = enc->y_top_ + top_stride;
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mem += 2 * top_stride;
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assert(mem <= (uint8_t*)enc + size);
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enc->config_ = config;
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enc->profile_ = use_filter ? ((config->filter_type == 1) ? 0 : 1) : 2;
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enc->pic_ = picture;
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enc->percent_ = 0;
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MapConfigToTools(enc);
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VP8EncDspInit();
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VP8DefaultProbas(enc);
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ResetSegmentHeader(enc);
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ResetFilterHeader(enc);
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ResetBoundaryPredictions(enc);
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VP8EncDspCostInit();
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VP8EncInitAlpha(enc);
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// lower quality means smaller output -> we modulate a little the page
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// size based on quality. This is just a crude 1rst-order prediction.
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{
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const float scale = 1.f + config->quality * 5.f / 100.f; // in [1,6]
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VP8TBufferInit(&enc->tokens_, (int)(mb_w * mb_h * 4 * scale));
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}
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return enc;
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}
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static int DeleteVP8Encoder(VP8Encoder* enc) {
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int ok = 1;
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if (enc != NULL) {
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ok = VP8EncDeleteAlpha(enc);
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VP8TBufferClear(&enc->tokens_);
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WebPSafeFree(enc);
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}
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return ok;
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}
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//------------------------------------------------------------------------------
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static double GetPSNR(uint64_t err, uint64_t size) {
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return (err > 0 && size > 0) ? 10. * log10(255. * 255. * size / err) : 99.;
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}
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static void FinalizePSNR(const VP8Encoder* const enc) {
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WebPAuxStats* stats = enc->pic_->stats;
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const uint64_t size = enc->sse_count_;
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const uint64_t* const sse = enc->sse_;
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stats->PSNR[0] = (float)GetPSNR(sse[0], size);
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stats->PSNR[1] = (float)GetPSNR(sse[1], size / 4);
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stats->PSNR[2] = (float)GetPSNR(sse[2], size / 4);
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stats->PSNR[3] = (float)GetPSNR(sse[0] + sse[1] + sse[2], size * 3 / 2);
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stats->PSNR[4] = (float)GetPSNR(sse[3], size);
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}
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static void StoreStats(VP8Encoder* const enc) {
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WebPAuxStats* const stats = enc->pic_->stats;
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if (stats != NULL) {
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int i, s;
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for (i = 0; i < NUM_MB_SEGMENTS; ++i) {
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stats->segment_level[i] = enc->dqm_[i].fstrength_;
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stats->segment_quant[i] = enc->dqm_[i].quant_;
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for (s = 0; s <= 2; ++s) {
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stats->residual_bytes[s][i] = enc->residual_bytes_[s][i];
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}
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}
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FinalizePSNR(enc);
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stats->coded_size = enc->coded_size_;
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for (i = 0; i < 3; ++i) {
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stats->block_count[i] = enc->block_count_[i];
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}
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}
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WebPReportProgress(enc->pic_, 100, &enc->percent_); // done!
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}
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int WebPEncodingSetError(const WebPPicture* const pic,
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WebPEncodingError error) {
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assert((int)error < VP8_ENC_ERROR_LAST);
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assert((int)error >= VP8_ENC_OK);
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((WebPPicture*)pic)->error_code = error;
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return 0;
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}
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int WebPReportProgress(const WebPPicture* const pic,
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int percent, int* const percent_store) {
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if (percent_store != NULL && percent != *percent_store) {
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*percent_store = percent;
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if (pic->progress_hook && !pic->progress_hook(percent, pic)) {
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// user abort requested
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WebPEncodingSetError(pic, VP8_ENC_ERROR_USER_ABORT);
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return 0;
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}
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}
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return 1; // ok
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}
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//------------------------------------------------------------------------------
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int WebPEncode(const WebPConfig* config, WebPPicture* pic) {
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int ok = 0;
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if (pic == NULL) return 0;
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WebPEncodingSetError(pic, VP8_ENC_OK); // all ok so far
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if (config == NULL) { // bad params
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return WebPEncodingSetError(pic, VP8_ENC_ERROR_NULL_PARAMETER);
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}
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if (!WebPValidateConfig(config)) {
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return WebPEncodingSetError(pic, VP8_ENC_ERROR_INVALID_CONFIGURATION);
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}
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if (pic->width <= 0 || pic->height <= 0) {
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return WebPEncodingSetError(pic, VP8_ENC_ERROR_BAD_DIMENSION);
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}
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if (pic->width > WEBP_MAX_DIMENSION || pic->height > WEBP_MAX_DIMENSION) {
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return WebPEncodingSetError(pic, VP8_ENC_ERROR_BAD_DIMENSION);
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}
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if (pic->stats != NULL) memset(pic->stats, 0, sizeof(*pic->stats));
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if (!config->lossless) {
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VP8Encoder* enc = NULL;
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if (!config->exact) {
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WebPCleanupTransparentArea(pic);
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}
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if (pic->use_argb || pic->y == NULL || pic->u == NULL || pic->v == NULL) {
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// Make sure we have YUVA samples.
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if (config->use_sharp_yuv || (config->preprocessing & 4)) {
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if (!WebPPictureSharpARGBToYUVA(pic)) {
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return 0;
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}
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} else {
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float dithering = 0.f;
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if (config->preprocessing & 2) {
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const float x = config->quality / 100.f;
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const float x2 = x * x;
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// slowly decreasing from max dithering at low quality (q->0)
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// to 0.5 dithering amplitude at high quality (q->100)
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dithering = 1.0f + (0.5f - 1.0f) * x2 * x2;
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}
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if (!WebPPictureARGBToYUVADithered(pic, WEBP_YUV420, dithering)) {
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return 0;
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}
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}
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}
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enc = InitVP8Encoder(config, pic);
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if (enc == NULL) return 0; // pic->error is already set.
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// Note: each of the tasks below account for 20% in the progress report.
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ok = VP8EncAnalyze(enc);
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// Analysis is done, proceed to actual coding.
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ok = ok && VP8EncStartAlpha(enc); // possibly done in parallel
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if (!enc->use_tokens_) {
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ok = ok && VP8EncLoop(enc);
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} else {
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ok = ok && VP8EncTokenLoop(enc);
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}
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ok = ok && VP8EncFinishAlpha(enc);
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ok = ok && VP8EncWrite(enc);
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StoreStats(enc);
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if (!ok) {
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VP8EncFreeBitWriters(enc);
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}
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ok &= DeleteVP8Encoder(enc); // must always be called, even if !ok
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} else {
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// Make sure we have ARGB samples.
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if (pic->argb == NULL && !WebPPictureYUVAToARGB(pic)) {
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return 0;
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}
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if (!config->exact) {
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WebPCleanupTransparentAreaLossless(pic);
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}
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ok = VP8LEncodeImage(config, pic); // Sets pic->error in case of problem.
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}
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return ok;
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}
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