399 lines
13 KiB
C
399 lines
13 KiB
C
// Copyright 2011 Google Inc. All Rights Reserved.
|
|
//
|
|
// Use of this source code is governed by a BSD-style license
|
|
// that can be found in the COPYING file in the root of the source
|
|
// tree. An additional intellectual property rights grant can be found
|
|
// in the file PATENTS. All contributing project authors may
|
|
// be found in the AUTHORS file in the root of the source tree.
|
|
// -----------------------------------------------------------------------------
|
|
//
|
|
// WebP encoder: main entry point
|
|
//
|
|
// Author: Skal (pascal.massimino@gmail.com)
|
|
|
|
#include <assert.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <math.h>
|
|
|
|
#include "./cost_enc.h"
|
|
#include "./vp8i_enc.h"
|
|
#include "./vp8li_enc.h"
|
|
#include "../utils/utils.h"
|
|
|
|
// #define PRINT_MEMORY_INFO
|
|
|
|
#ifdef PRINT_MEMORY_INFO
|
|
#include <stdio.h>
|
|
#endif
|
|
|
|
//------------------------------------------------------------------------------
|
|
|
|
int WebPGetEncoderVersion(void) {
|
|
return (ENC_MAJ_VERSION << 16) | (ENC_MIN_VERSION << 8) | ENC_REV_VERSION;
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
// VP8Encoder
|
|
//------------------------------------------------------------------------------
|
|
|
|
static void ResetSegmentHeader(VP8Encoder* const enc) {
|
|
VP8EncSegmentHeader* const hdr = &enc->segment_hdr_;
|
|
hdr->num_segments_ = enc->config_->segments;
|
|
hdr->update_map_ = (hdr->num_segments_ > 1);
|
|
hdr->size_ = 0;
|
|
}
|
|
|
|
static void ResetFilterHeader(VP8Encoder* const enc) {
|
|
VP8EncFilterHeader* const hdr = &enc->filter_hdr_;
|
|
hdr->simple_ = 1;
|
|
hdr->level_ = 0;
|
|
hdr->sharpness_ = 0;
|
|
hdr->i4x4_lf_delta_ = 0;
|
|
}
|
|
|
|
static void ResetBoundaryPredictions(VP8Encoder* const enc) {
|
|
// init boundary values once for all
|
|
// Note: actually, initializing the preds_[] is only needed for intra4.
|
|
int i;
|
|
uint8_t* const top = enc->preds_ - enc->preds_w_;
|
|
uint8_t* const left = enc->preds_ - 1;
|
|
for (i = -1; i < 4 * enc->mb_w_; ++i) {
|
|
top[i] = B_DC_PRED;
|
|
}
|
|
for (i = 0; i < 4 * enc->mb_h_; ++i) {
|
|
left[i * enc->preds_w_] = B_DC_PRED;
|
|
}
|
|
enc->nz_[-1] = 0; // constant
|
|
}
|
|
|
|
// Mapping from config->method_ to coding tools used.
|
|
//-------------------+---+---+---+---+---+---+---+
|
|
// Method | 0 | 1 | 2 | 3 |(4)| 5 | 6 |
|
|
//-------------------+---+---+---+---+---+---+---+
|
|
// fast probe | x | | | x | | | |
|
|
//-------------------+---+---+---+---+---+---+---+
|
|
// dynamic proba | ~ | x | x | x | x | x | x |
|
|
//-------------------+---+---+---+---+---+---+---+
|
|
// fast mode analysis|[x]|[x]| | | x | x | x |
|
|
//-------------------+---+---+---+---+---+---+---+
|
|
// basic rd-opt | | | | x | x | x | x |
|
|
//-------------------+---+---+---+---+---+---+---+
|
|
// disto-refine i4/16| x | x | x | | | | |
|
|
//-------------------+---+---+---+---+---+---+---+
|
|
// disto-refine uv | | x | x | | | | |
|
|
//-------------------+---+---+---+---+---+---+---+
|
|
// rd-opt i4/16 | | | ~ | x | x | x | x |
|
|
//-------------------+---+---+---+---+---+---+---+
|
|
// token buffer (opt)| | | | x | x | x | x |
|
|
//-------------------+---+---+---+---+---+---+---+
|
|
// Trellis | | | | | | x |Ful|
|
|
//-------------------+---+---+---+---+---+---+---+
|
|
// full-SNS | | | | | x | x | x |
|
|
//-------------------+---+---+---+---+---+---+---+
|
|
|
|
static void MapConfigToTools(VP8Encoder* const enc) {
|
|
const WebPConfig* const config = enc->config_;
|
|
const int method = config->method;
|
|
const int limit = 100 - config->partition_limit;
|
|
enc->method_ = method;
|
|
enc->rd_opt_level_ = (method >= 6) ? RD_OPT_TRELLIS_ALL
|
|
: (method >= 5) ? RD_OPT_TRELLIS
|
|
: (method >= 3) ? RD_OPT_BASIC
|
|
: RD_OPT_NONE;
|
|
enc->max_i4_header_bits_ =
|
|
256 * 16 * 16 * // upper bound: up to 16bit per 4x4 block
|
|
(limit * limit) / (100 * 100); // ... modulated with a quadratic curve.
|
|
|
|
// partition0 = 512k max.
|
|
enc->mb_header_limit_ =
|
|
(score_t)256 * 510 * 8 * 1024 / (enc->mb_w_ * enc->mb_h_);
|
|
|
|
enc->thread_level_ = config->thread_level;
|
|
|
|
enc->do_search_ = (config->target_size > 0 || config->target_PSNR > 0);
|
|
if (!config->low_memory) {
|
|
#if !defined(DISABLE_TOKEN_BUFFER)
|
|
enc->use_tokens_ = (enc->rd_opt_level_ >= RD_OPT_BASIC); // need rd stats
|
|
#endif
|
|
if (enc->use_tokens_) {
|
|
enc->num_parts_ = 1; // doesn't work with multi-partition
|
|
}
|
|
}
|
|
}
|
|
|
|
// Memory scaling with dimensions:
|
|
// memory (bytes) ~= 2.25 * w + 0.0625 * w * h
|
|
//
|
|
// Typical memory footprint (614x440 picture)
|
|
// encoder: 22111
|
|
// info: 4368
|
|
// preds: 17741
|
|
// top samples: 1263
|
|
// non-zero: 175
|
|
// lf-stats: 0
|
|
// total: 45658
|
|
// Transient object sizes:
|
|
// VP8EncIterator: 3360
|
|
// VP8ModeScore: 872
|
|
// VP8SegmentInfo: 732
|
|
// VP8EncProba: 18352
|
|
// LFStats: 2048
|
|
// Picture size (yuv): 419328
|
|
|
|
static VP8Encoder* InitVP8Encoder(const WebPConfig* const config,
|
|
WebPPicture* const picture) {
|
|
VP8Encoder* enc;
|
|
const int use_filter =
|
|
(config->filter_strength > 0) || (config->autofilter > 0);
|
|
const int mb_w = (picture->width + 15) >> 4;
|
|
const int mb_h = (picture->height + 15) >> 4;
|
|
const int preds_w = 4 * mb_w + 1;
|
|
const int preds_h = 4 * mb_h + 1;
|
|
const size_t preds_size = preds_w * preds_h * sizeof(*enc->preds_);
|
|
const int top_stride = mb_w * 16;
|
|
const size_t nz_size = (mb_w + 1) * sizeof(*enc->nz_) + WEBP_ALIGN_CST;
|
|
const size_t info_size = mb_w * mb_h * sizeof(*enc->mb_info_);
|
|
const size_t samples_size =
|
|
2 * top_stride * sizeof(*enc->y_top_) // top-luma/u/v
|
|
+ WEBP_ALIGN_CST; // align all
|
|
const size_t lf_stats_size =
|
|
config->autofilter ? sizeof(*enc->lf_stats_) + WEBP_ALIGN_CST : 0;
|
|
uint8_t* mem;
|
|
const uint64_t size = (uint64_t)sizeof(*enc) // main struct
|
|
+ WEBP_ALIGN_CST // cache alignment
|
|
+ info_size // modes info
|
|
+ preds_size // prediction modes
|
|
+ samples_size // top/left samples
|
|
+ nz_size // coeff context bits
|
|
+ lf_stats_size; // autofilter stats
|
|
|
|
#ifdef PRINT_MEMORY_INFO
|
|
printf("===================================\n");
|
|
printf("Memory used:\n"
|
|
" encoder: %ld\n"
|
|
" info: %ld\n"
|
|
" preds: %ld\n"
|
|
" top samples: %ld\n"
|
|
" non-zero: %ld\n"
|
|
" lf-stats: %ld\n"
|
|
" total: %ld\n",
|
|
sizeof(*enc) + WEBP_ALIGN_CST, info_size,
|
|
preds_size, samples_size, nz_size, lf_stats_size, size);
|
|
printf("Transient object sizes:\n"
|
|
" VP8EncIterator: %ld\n"
|
|
" VP8ModeScore: %ld\n"
|
|
" VP8SegmentInfo: %ld\n"
|
|
" VP8EncProba: %ld\n"
|
|
" LFStats: %ld\n",
|
|
sizeof(VP8EncIterator), sizeof(VP8ModeScore),
|
|
sizeof(VP8SegmentInfo), sizeof(VP8EncProba),
|
|
sizeof(LFStats));
|
|
printf("Picture size (yuv): %ld\n",
|
|
mb_w * mb_h * 384 * sizeof(uint8_t));
|
|
printf("===================================\n");
|
|
#endif
|
|
mem = (uint8_t*)WebPSafeMalloc(size, sizeof(*mem));
|
|
if (mem == NULL) {
|
|
WebPEncodingSetError(picture, VP8_ENC_ERROR_OUT_OF_MEMORY);
|
|
return NULL;
|
|
}
|
|
enc = (VP8Encoder*)mem;
|
|
mem = (uint8_t*)WEBP_ALIGN(mem + sizeof(*enc));
|
|
memset(enc, 0, sizeof(*enc));
|
|
enc->num_parts_ = 1 << config->partitions;
|
|
enc->mb_w_ = mb_w;
|
|
enc->mb_h_ = mb_h;
|
|
enc->preds_w_ = preds_w;
|
|
enc->mb_info_ = (VP8MBInfo*)mem;
|
|
mem += info_size;
|
|
enc->preds_ = ((uint8_t*)mem) + 1 + enc->preds_w_;
|
|
mem += preds_size;
|
|
enc->nz_ = 1 + (uint32_t*)WEBP_ALIGN(mem);
|
|
mem += nz_size;
|
|
enc->lf_stats_ = lf_stats_size ? (LFStats*)WEBP_ALIGN(mem) : NULL;
|
|
mem += lf_stats_size;
|
|
|
|
// top samples (all 16-aligned)
|
|
mem = (uint8_t*)WEBP_ALIGN(mem);
|
|
enc->y_top_ = (uint8_t*)mem;
|
|
enc->uv_top_ = enc->y_top_ + top_stride;
|
|
mem += 2 * top_stride;
|
|
assert(mem <= (uint8_t*)enc + size);
|
|
|
|
enc->config_ = config;
|
|
enc->profile_ = use_filter ? ((config->filter_type == 1) ? 0 : 1) : 2;
|
|
enc->pic_ = picture;
|
|
enc->percent_ = 0;
|
|
|
|
MapConfigToTools(enc);
|
|
VP8EncDspInit();
|
|
VP8DefaultProbas(enc);
|
|
ResetSegmentHeader(enc);
|
|
ResetFilterHeader(enc);
|
|
ResetBoundaryPredictions(enc);
|
|
VP8EncDspCostInit();
|
|
VP8EncInitAlpha(enc);
|
|
|
|
// lower quality means smaller output -> we modulate a little the page
|
|
// size based on quality. This is just a crude 1rst-order prediction.
|
|
{
|
|
const float scale = 1.f + config->quality * 5.f / 100.f; // in [1,6]
|
|
VP8TBufferInit(&enc->tokens_, (int)(mb_w * mb_h * 4 * scale));
|
|
}
|
|
return enc;
|
|
}
|
|
|
|
static int DeleteVP8Encoder(VP8Encoder* enc) {
|
|
int ok = 1;
|
|
if (enc != NULL) {
|
|
ok = VP8EncDeleteAlpha(enc);
|
|
VP8TBufferClear(&enc->tokens_);
|
|
WebPSafeFree(enc);
|
|
}
|
|
return ok;
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
|
|
static double GetPSNR(uint64_t err, uint64_t size) {
|
|
return (err > 0 && size > 0) ? 10. * log10(255. * 255. * size / err) : 99.;
|
|
}
|
|
|
|
static void FinalizePSNR(const VP8Encoder* const enc) {
|
|
WebPAuxStats* stats = enc->pic_->stats;
|
|
const uint64_t size = enc->sse_count_;
|
|
const uint64_t* const sse = enc->sse_;
|
|
stats->PSNR[0] = (float)GetPSNR(sse[0], size);
|
|
stats->PSNR[1] = (float)GetPSNR(sse[1], size / 4);
|
|
stats->PSNR[2] = (float)GetPSNR(sse[2], size / 4);
|
|
stats->PSNR[3] = (float)GetPSNR(sse[0] + sse[1] + sse[2], size * 3 / 2);
|
|
stats->PSNR[4] = (float)GetPSNR(sse[3], size);
|
|
}
|
|
|
|
static void StoreStats(VP8Encoder* const enc) {
|
|
WebPAuxStats* const stats = enc->pic_->stats;
|
|
if (stats != NULL) {
|
|
int i, s;
|
|
for (i = 0; i < NUM_MB_SEGMENTS; ++i) {
|
|
stats->segment_level[i] = enc->dqm_[i].fstrength_;
|
|
stats->segment_quant[i] = enc->dqm_[i].quant_;
|
|
for (s = 0; s <= 2; ++s) {
|
|
stats->residual_bytes[s][i] = enc->residual_bytes_[s][i];
|
|
}
|
|
}
|
|
FinalizePSNR(enc);
|
|
stats->coded_size = enc->coded_size_;
|
|
for (i = 0; i < 3; ++i) {
|
|
stats->block_count[i] = enc->block_count_[i];
|
|
}
|
|
}
|
|
WebPReportProgress(enc->pic_, 100, &enc->percent_); // done!
|
|
}
|
|
|
|
int WebPEncodingSetError(const WebPPicture* const pic,
|
|
WebPEncodingError error) {
|
|
assert((int)error < VP8_ENC_ERROR_LAST);
|
|
assert((int)error >= VP8_ENC_OK);
|
|
((WebPPicture*)pic)->error_code = error;
|
|
return 0;
|
|
}
|
|
|
|
int WebPReportProgress(const WebPPicture* const pic,
|
|
int percent, int* const percent_store) {
|
|
if (percent_store != NULL && percent != *percent_store) {
|
|
*percent_store = percent;
|
|
if (pic->progress_hook && !pic->progress_hook(percent, pic)) {
|
|
// user abort requested
|
|
WebPEncodingSetError(pic, VP8_ENC_ERROR_USER_ABORT);
|
|
return 0;
|
|
}
|
|
}
|
|
return 1; // ok
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
int WebPEncode(const WebPConfig* config, WebPPicture* pic) {
|
|
int ok = 0;
|
|
if (pic == NULL) return 0;
|
|
|
|
WebPEncodingSetError(pic, VP8_ENC_OK); // all ok so far
|
|
if (config == NULL) { // bad params
|
|
return WebPEncodingSetError(pic, VP8_ENC_ERROR_NULL_PARAMETER);
|
|
}
|
|
if (!WebPValidateConfig(config)) {
|
|
return WebPEncodingSetError(pic, VP8_ENC_ERROR_INVALID_CONFIGURATION);
|
|
}
|
|
if (pic->width <= 0 || pic->height <= 0) {
|
|
return WebPEncodingSetError(pic, VP8_ENC_ERROR_BAD_DIMENSION);
|
|
}
|
|
if (pic->width > WEBP_MAX_DIMENSION || pic->height > WEBP_MAX_DIMENSION) {
|
|
return WebPEncodingSetError(pic, VP8_ENC_ERROR_BAD_DIMENSION);
|
|
}
|
|
|
|
if (pic->stats != NULL) memset(pic->stats, 0, sizeof(*pic->stats));
|
|
|
|
if (!config->lossless) {
|
|
VP8Encoder* enc = NULL;
|
|
|
|
if (!config->exact) {
|
|
WebPCleanupTransparentArea(pic);
|
|
}
|
|
|
|
if (pic->use_argb || pic->y == NULL || pic->u == NULL || pic->v == NULL) {
|
|
// Make sure we have YUVA samples.
|
|
if (config->use_sharp_yuv || (config->preprocessing & 4)) {
|
|
if (!WebPPictureSharpARGBToYUVA(pic)) {
|
|
return 0;
|
|
}
|
|
} else {
|
|
float dithering = 0.f;
|
|
if (config->preprocessing & 2) {
|
|
const float x = config->quality / 100.f;
|
|
const float x2 = x * x;
|
|
// slowly decreasing from max dithering at low quality (q->0)
|
|
// to 0.5 dithering amplitude at high quality (q->100)
|
|
dithering = 1.0f + (0.5f - 1.0f) * x2 * x2;
|
|
}
|
|
if (!WebPPictureARGBToYUVADithered(pic, WEBP_YUV420, dithering)) {
|
|
return 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
enc = InitVP8Encoder(config, pic);
|
|
if (enc == NULL) return 0; // pic->error is already set.
|
|
// Note: each of the tasks below account for 20% in the progress report.
|
|
ok = VP8EncAnalyze(enc);
|
|
|
|
// Analysis is done, proceed to actual coding.
|
|
ok = ok && VP8EncStartAlpha(enc); // possibly done in parallel
|
|
if (!enc->use_tokens_) {
|
|
ok = ok && VP8EncLoop(enc);
|
|
} else {
|
|
ok = ok && VP8EncTokenLoop(enc);
|
|
}
|
|
ok = ok && VP8EncFinishAlpha(enc);
|
|
|
|
ok = ok && VP8EncWrite(enc);
|
|
StoreStats(enc);
|
|
if (!ok) {
|
|
VP8EncFreeBitWriters(enc);
|
|
}
|
|
ok &= DeleteVP8Encoder(enc); // must always be called, even if !ok
|
|
} else {
|
|
// Make sure we have ARGB samples.
|
|
if (pic->argb == NULL && !WebPPictureYUVAToARGB(pic)) {
|
|
return 0;
|
|
}
|
|
|
|
if (!config->exact) {
|
|
WebPCleanupTransparentAreaLossless(pic);
|
|
}
|
|
|
|
ok = VP8LEncodeImage(config, pic); // Sets pic->error in case of problem.
|
|
}
|
|
|
|
return ok;
|
|
}
|