1 // Copyright 2011 Google Inc. All Rights Reserved. 2 // 3 // Use of this source code is governed by a BSD-style license 4 // that can be found in the COPYING file in the root of the source 5 // tree. An additional intellectual property rights grant can be found 6 // in the file PATENTS. All contributing project authors may 7 // be found in the AUTHORS file in the root of the source tree. 8 // ----------------------------------------------------------------------------- 9 // 10 // WebP encoder: main entry point 11 // 12 // Author: Skal (pascal.massimino (at) gmail.com) 13 14 #include <assert.h> 15 #include <stdlib.h> 16 #include <string.h> 17 #include <math.h> 18 19 #include "./vp8enci.h" 20 #include "./vp8li.h" 21 #include "./cost.h" 22 #include "../utils/utils.h" 23 24 // #define PRINT_MEMORY_INFO 25 26 #ifdef PRINT_MEMORY_INFO 27 #include <stdio.h> 28 #endif 29 30 //------------------------------------------------------------------------------ 31 32 int WebPGetEncoderVersion(void) { 33 return (ENC_MAJ_VERSION << 16) | (ENC_MIN_VERSION << 8) | ENC_REV_VERSION; 34 } 35 36 //------------------------------------------------------------------------------ 37 // VP8Encoder 38 //------------------------------------------------------------------------------ 39 40 static void ResetSegmentHeader(VP8Encoder* const enc) { 41 VP8SegmentHeader* const hdr = &enc->segment_hdr_; 42 hdr->num_segments_ = enc->config_->segments; 43 hdr->update_map_ = (hdr->num_segments_ > 1); 44 hdr->size_ = 0; 45 } 46 47 static void ResetFilterHeader(VP8Encoder* const enc) { 48 VP8FilterHeader* const hdr = &enc->filter_hdr_; 49 hdr->simple_ = 1; 50 hdr->level_ = 0; 51 hdr->sharpness_ = 0; 52 hdr->i4x4_lf_delta_ = 0; 53 } 54 55 static void ResetBoundaryPredictions(VP8Encoder* const enc) { 56 // init boundary values once for all 57 // Note: actually, initializing the preds_[] is only needed for intra4. 58 int i; 59 uint8_t* const top = enc->preds_ - enc->preds_w_; 60 uint8_t* const left = enc->preds_ - 1; 61 for (i = -1; i < 4 * enc->mb_w_; ++i) { 62 top[i] = B_DC_PRED; 63 } 64 for (i = 0; i < 4 * enc->mb_h_; ++i) { 65 left[i * enc->preds_w_] = B_DC_PRED; 66 } 67 enc->nz_[-1] = 0; // constant 68 } 69 70 // Mapping from config->method_ to coding tools used. 71 //-------------------+---+---+---+---+---+---+---+ 72 // Method | 0 | 1 | 2 | 3 |(4)| 5 | 6 | 73 //-------------------+---+---+---+---+---+---+---+ 74 // fast probe | x | | | x | | | | 75 //-------------------+---+---+---+---+---+---+---+ 76 // dynamic proba | ~ | x | x | x | x | x | x | 77 //-------------------+---+---+---+---+---+---+---+ 78 // fast mode analysis| | | | | x | x | x | 79 //-------------------+---+---+---+---+---+---+---+ 80 // basic rd-opt | | | | x | x | x | x | 81 //-------------------+---+---+---+---+---+---+---+ 82 // disto-score i4/16 | | | x | | | | | 83 //-------------------+---+---+---+---+---+---+---+ 84 // rd-opt i4/16 | | | ~ | x | x | x | x | 85 //-------------------+---+---+---+---+---+---+---+ 86 // token buffer (opt)| | | | x | x | x | x | 87 //-------------------+---+---+---+---+---+---+---+ 88 // Trellis | | | | | | x |Ful| 89 //-------------------+---+---+---+---+---+---+---+ 90 // full-SNS | | | | | x | x | x | 91 //-------------------+---+---+---+---+---+---+---+ 92 93 static void MapConfigToTools(VP8Encoder* const enc) { 94 const WebPConfig* const config = enc->config_; 95 const int method = config->method; 96 const int limit = 100 - config->partition_limit; 97 enc->method_ = method; 98 enc->rd_opt_level_ = (method >= 6) ? RD_OPT_TRELLIS_ALL 99 : (method >= 5) ? RD_OPT_TRELLIS 100 : (method >= 3) ? RD_OPT_BASIC 101 : RD_OPT_NONE; 102 enc->max_i4_header_bits_ = 103 256 * 16 * 16 * // upper bound: up to 16bit per 4x4 block 104 (limit * limit) / (100 * 100); // ... modulated with a quadratic curve. 105 106 enc->thread_level_ = config->thread_level; 107 108 enc->do_search_ = (config->target_size > 0 || config->target_PSNR > 0); 109 if (!config->low_memory) { 110 #if !defined(DISABLE_TOKEN_BUFFER) 111 enc->use_tokens_ = (enc->rd_opt_level_ >= RD_OPT_BASIC); // need rd stats 112 #endif 113 if (enc->use_tokens_) { 114 enc->num_parts_ = 1; // doesn't work with multi-partition 115 } 116 } 117 } 118 119 // Memory scaling with dimensions: 120 // memory (bytes) ~= 2.25 * w + 0.0625 * w * h 121 // 122 // Typical memory footprint (614x440 picture) 123 // encoder: 22111 124 // info: 4368 125 // preds: 17741 126 // top samples: 1263 127 // non-zero: 175 128 // lf-stats: 0 129 // total: 45658 130 // Transient object sizes: 131 // VP8EncIterator: 3360 132 // VP8ModeScore: 872 133 // VP8SegmentInfo: 732 134 // VP8Proba: 18352 135 // LFStats: 2048 136 // Picture size (yuv): 419328 137 138 static VP8Encoder* InitVP8Encoder(const WebPConfig* const config, 139 WebPPicture* const picture) { 140 const int use_filter = 141 (config->filter_strength > 0) || (config->autofilter > 0); 142 const int mb_w = (picture->width + 15) >> 4; 143 const int mb_h = (picture->height + 15) >> 4; 144 const int preds_w = 4 * mb_w + 1; 145 const int preds_h = 4 * mb_h + 1; 146 const size_t preds_size = preds_w * preds_h * sizeof(uint8_t); 147 const int top_stride = mb_w * 16; 148 const size_t nz_size = (mb_w + 1) * sizeof(uint32_t) + ALIGN_CST; 149 const size_t info_size = mb_w * mb_h * sizeof(VP8MBInfo); 150 const size_t samples_size = 2 * top_stride * sizeof(uint8_t) // top-luma/u/v 151 + ALIGN_CST; // align all 152 const size_t lf_stats_size = 153 config->autofilter ? sizeof(LFStats) + ALIGN_CST : 0; 154 VP8Encoder* enc; 155 uint8_t* mem; 156 const uint64_t size = (uint64_t)sizeof(VP8Encoder) // main struct 157 + ALIGN_CST // cache alignment 158 + info_size // modes info 159 + preds_size // prediction modes 160 + samples_size // top/left samples 161 + nz_size // coeff context bits 162 + lf_stats_size; // autofilter stats 163 164 #ifdef PRINT_MEMORY_INFO 165 printf("===================================\n"); 166 printf("Memory used:\n" 167 " encoder: %ld\n" 168 " info: %ld\n" 169 " preds: %ld\n" 170 " top samples: %ld\n" 171 " non-zero: %ld\n" 172 " lf-stats: %ld\n" 173 " total: %ld\n", 174 sizeof(VP8Encoder) + ALIGN_CST, info_size, 175 preds_size, samples_size, nz_size, lf_stats_size, size); 176 printf("Transient object sizes:\n" 177 " VP8EncIterator: %ld\n" 178 " VP8ModeScore: %ld\n" 179 " VP8SegmentInfo: %ld\n" 180 " VP8Proba: %ld\n" 181 " LFStats: %ld\n", 182 sizeof(VP8EncIterator), sizeof(VP8ModeScore), 183 sizeof(VP8SegmentInfo), sizeof(VP8Proba), 184 sizeof(LFStats)); 185 printf("Picture size (yuv): %ld\n", 186 mb_w * mb_h * 384 * sizeof(uint8_t)); 187 printf("===================================\n"); 188 #endif 189 mem = (uint8_t*)WebPSafeMalloc(size, sizeof(*mem)); 190 if (mem == NULL) { 191 WebPEncodingSetError(picture, VP8_ENC_ERROR_OUT_OF_MEMORY); 192 return NULL; 193 } 194 enc = (VP8Encoder*)mem; 195 mem = (uint8_t*)DO_ALIGN(mem + sizeof(*enc)); 196 memset(enc, 0, sizeof(*enc)); 197 enc->num_parts_ = 1 << config->partitions; 198 enc->mb_w_ = mb_w; 199 enc->mb_h_ = mb_h; 200 enc->preds_w_ = preds_w; 201 enc->mb_info_ = (VP8MBInfo*)mem; 202 mem += info_size; 203 enc->preds_ = ((uint8_t*)mem) + 1 + enc->preds_w_; 204 mem += preds_w * preds_h * sizeof(uint8_t); 205 enc->nz_ = 1 + (uint32_t*)DO_ALIGN(mem); 206 mem += nz_size; 207 enc->lf_stats_ = lf_stats_size ? (LFStats*)DO_ALIGN(mem) : NULL; 208 mem += lf_stats_size; 209 210 // top samples (all 16-aligned) 211 mem = (uint8_t*)DO_ALIGN(mem); 212 enc->y_top_ = (uint8_t*)mem; 213 enc->uv_top_ = enc->y_top_ + top_stride; 214 mem += 2 * top_stride; 215 assert(mem <= (uint8_t*)enc + size); 216 217 enc->config_ = config; 218 enc->profile_ = use_filter ? ((config->filter_type == 1) ? 0 : 1) : 2; 219 enc->pic_ = picture; 220 enc->percent_ = 0; 221 222 MapConfigToTools(enc); 223 VP8EncDspInit(); 224 VP8DefaultProbas(enc); 225 ResetSegmentHeader(enc); 226 ResetFilterHeader(enc); 227 ResetBoundaryPredictions(enc); 228 VP8GetResidualCostInit(); 229 VP8SetResidualCoeffsInit(); 230 VP8EncInitAlpha(enc); 231 232 // lower quality means smaller output -> we modulate a little the page 233 // size based on quality. This is just a crude 1rst-order prediction. 234 { 235 const float scale = 1.f + config->quality * 5.f / 100.f; // in [1,6] 236 VP8TBufferInit(&enc->tokens_, (int)(mb_w * mb_h * 4 * scale)); 237 } 238 return enc; 239 } 240 241 static int DeleteVP8Encoder(VP8Encoder* enc) { 242 int ok = 1; 243 if (enc != NULL) { 244 ok = VP8EncDeleteAlpha(enc); 245 VP8TBufferClear(&enc->tokens_); 246 WebPSafeFree(enc); 247 } 248 return ok; 249 } 250 251 //------------------------------------------------------------------------------ 252 253 static double GetPSNR(uint64_t err, uint64_t size) { 254 return (err > 0 && size > 0) ? 10. * log10(255. * 255. * size / err) : 99.; 255 } 256 257 static void FinalizePSNR(const VP8Encoder* const enc) { 258 WebPAuxStats* stats = enc->pic_->stats; 259 const uint64_t size = enc->sse_count_; 260 const uint64_t* const sse = enc->sse_; 261 stats->PSNR[0] = (float)GetPSNR(sse[0], size); 262 stats->PSNR[1] = (float)GetPSNR(sse[1], size / 4); 263 stats->PSNR[2] = (float)GetPSNR(sse[2], size / 4); 264 stats->PSNR[3] = (float)GetPSNR(sse[0] + sse[1] + sse[2], size * 3 / 2); 265 stats->PSNR[4] = (float)GetPSNR(sse[3], size); 266 } 267 268 static void StoreStats(VP8Encoder* const enc) { 269 WebPAuxStats* const stats = enc->pic_->stats; 270 if (stats != NULL) { 271 int i, s; 272 for (i = 0; i < NUM_MB_SEGMENTS; ++i) { 273 stats->segment_level[i] = enc->dqm_[i].fstrength_; 274 stats->segment_quant[i] = enc->dqm_[i].quant_; 275 for (s = 0; s <= 2; ++s) { 276 stats->residual_bytes[s][i] = enc->residual_bytes_[s][i]; 277 } 278 } 279 FinalizePSNR(enc); 280 stats->coded_size = enc->coded_size_; 281 for (i = 0; i < 3; ++i) { 282 stats->block_count[i] = enc->block_count_[i]; 283 } 284 } 285 WebPReportProgress(enc->pic_, 100, &enc->percent_); // done! 286 } 287 288 int WebPEncodingSetError(const WebPPicture* const pic, 289 WebPEncodingError error) { 290 assert((int)error < VP8_ENC_ERROR_LAST); 291 assert((int)error >= VP8_ENC_OK); 292 ((WebPPicture*)pic)->error_code = error; 293 return 0; 294 } 295 296 int WebPReportProgress(const WebPPicture* const pic, 297 int percent, int* const percent_store) { 298 if (percent_store != NULL && percent != *percent_store) { 299 *percent_store = percent; 300 if (pic->progress_hook && !pic->progress_hook(percent, pic)) { 301 // user abort requested 302 WebPEncodingSetError(pic, VP8_ENC_ERROR_USER_ABORT); 303 return 0; 304 } 305 } 306 return 1; // ok 307 } 308 //------------------------------------------------------------------------------ 309 310 int WebPEncode(const WebPConfig* config, WebPPicture* pic) { 311 int ok = 0; 312 313 if (pic == NULL) 314 return 0; 315 WebPEncodingSetError(pic, VP8_ENC_OK); // all ok so far 316 if (config == NULL) // bad params 317 return WebPEncodingSetError(pic, VP8_ENC_ERROR_NULL_PARAMETER); 318 if (!WebPValidateConfig(config)) 319 return WebPEncodingSetError(pic, VP8_ENC_ERROR_INVALID_CONFIGURATION); 320 if (pic->width <= 0 || pic->height <= 0) 321 return WebPEncodingSetError(pic, VP8_ENC_ERROR_BAD_DIMENSION); 322 if (pic->width > WEBP_MAX_DIMENSION || pic->height > WEBP_MAX_DIMENSION) 323 return WebPEncodingSetError(pic, VP8_ENC_ERROR_BAD_DIMENSION); 324 325 if (pic->stats != NULL) memset(pic->stats, 0, sizeof(*pic->stats)); 326 327 if (!config->lossless) { 328 VP8Encoder* enc = NULL; 329 if (pic->y == NULL || pic->u == NULL || pic->v == NULL) { 330 // Make sure we have YUVA samples. 331 float dithering = 0.f; 332 if (config->preprocessing & 2) { 333 const float x = config->quality / 100.f; 334 const float x2 = x * x; 335 // slowly decreasing from max dithering at low quality (q->0) 336 // to 0.5 dithering amplitude at high quality (q->100) 337 dithering = 1.0f + (0.5f - 1.0f) * x2 * x2; 338 } 339 if (!WebPPictureARGBToYUVADithered(pic, WEBP_YUV420, dithering)) { 340 return 0; 341 } 342 } 343 344 enc = InitVP8Encoder(config, pic); 345 if (enc == NULL) return 0; // pic->error is already set. 346 // Note: each of the tasks below account for 20% in the progress report. 347 ok = VP8EncAnalyze(enc); 348 349 // Analysis is done, proceed to actual coding. 350 ok = ok && VP8EncStartAlpha(enc); // possibly done in parallel 351 if (!enc->use_tokens_) { 352 ok = ok && VP8EncLoop(enc); 353 } else { 354 ok = ok && VP8EncTokenLoop(enc); 355 } 356 ok = ok && VP8EncFinishAlpha(enc); 357 358 ok = ok && VP8EncWrite(enc); 359 StoreStats(enc); 360 if (!ok) { 361 VP8EncFreeBitWriters(enc); 362 } 363 ok &= DeleteVP8Encoder(enc); // must always be called, even if !ok 364 } else { 365 // Make sure we have ARGB samples. 366 if (pic->argb == NULL && !WebPPictureYUVAToARGB(pic)) { 367 return 0; 368 } 369 370 ok = VP8LEncodeImage(config, pic); // Sets pic->error in case of problem. 371 } 372 373 return ok; 374 } 375
