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: internal header. 11 // 12 // Author: Skal (pascal.massimino (at) gmail.com) 13 14 #ifndef WEBP_ENC_VP8ENCI_H_ 15 #define WEBP_ENC_VP8ENCI_H_ 16 17 #include <string.h> // for memcpy() 18 #include "../webp/encode.h" 19 #include "../dsp/dsp.h" 20 #include "../utils/bit_writer.h" 21 #include "../utils/thread.h" 22 23 #if defined(__cplusplus) || defined(c_plusplus) 24 extern "C" { 25 #endif 26 27 //------------------------------------------------------------------------------ 28 // Various defines and enums 29 30 // version numbers 31 #define ENC_MAJ_VERSION 0 32 #define ENC_MIN_VERSION 3 33 #define ENC_REV_VERSION 1 34 35 // intra prediction modes 36 enum { B_DC_PRED = 0, // 4x4 modes 37 B_TM_PRED = 1, 38 B_VE_PRED = 2, 39 B_HE_PRED = 3, 40 B_RD_PRED = 4, 41 B_VR_PRED = 5, 42 B_LD_PRED = 6, 43 B_VL_PRED = 7, 44 B_HD_PRED = 8, 45 B_HU_PRED = 9, 46 NUM_BMODES = B_HU_PRED + 1 - B_DC_PRED, // = 10 47 48 // Luma16 or UV modes 49 DC_PRED = B_DC_PRED, V_PRED = B_VE_PRED, 50 H_PRED = B_HE_PRED, TM_PRED = B_TM_PRED, 51 NUM_PRED_MODES = 4 52 }; 53 54 enum { NUM_MB_SEGMENTS = 4, 55 MAX_NUM_PARTITIONS = 8, 56 NUM_TYPES = 4, // 0: i16-AC, 1: i16-DC, 2:chroma-AC, 3:i4-AC 57 NUM_BANDS = 8, 58 NUM_CTX = 3, 59 NUM_PROBAS = 11, 60 MAX_LF_LEVELS = 64, // Maximum loop filter level 61 MAX_VARIABLE_LEVEL = 67, // last (inclusive) level with variable cost 62 MAX_LEVEL = 2047 // max level (note: max codable is 2047 + 67) 63 }; 64 65 typedef enum { // Rate-distortion optimization levels 66 RD_OPT_NONE = 0, // no rd-opt 67 RD_OPT_BASIC = 1, // basic scoring (no trellis) 68 RD_OPT_TRELLIS = 2, // perform trellis-quant on the final decision only 69 RD_OPT_TRELLIS_ALL = 3 // trellis-quant for every scoring (much slower) 70 } VP8RDLevel; 71 72 // YUV-cache parameters. Cache is 16-pixels wide. 73 // The original or reconstructed samples can be accessed using VP8Scan[] 74 // The predicted blocks can be accessed using offsets to yuv_p_ and 75 // the arrays VP8*ModeOffsets[]; 76 // +----+ YUV Samples area. See VP8Scan[] for accessing the blocks. 77 // Y_OFF |YYYY| <- original samples (enc->yuv_in_) 78 // |YYYY| 79 // |YYYY| 80 // |YYYY| 81 // U_OFF |UUVV| V_OFF (=U_OFF + 8) 82 // |UUVV| 83 // +----+ 84 // Y_OFF |YYYY| <- compressed/decoded samples ('yuv_out_') 85 // |YYYY| There are two buffers like this ('yuv_out_'/'yuv_out2_') 86 // |YYYY| 87 // |YYYY| 88 // U_OFF |UUVV| V_OFF 89 // |UUVV| 90 // x2 (for yuv_out2_) 91 // +----+ Prediction area ('yuv_p_', size = PRED_SIZE) 92 // I16DC16 |YYYY| Intra16 predictions (16x16 block each) 93 // |YYYY| 94 // |YYYY| 95 // |YYYY| 96 // I16TM16 |YYYY| 97 // |YYYY| 98 // |YYYY| 99 // |YYYY| 100 // I16VE16 |YYYY| 101 // |YYYY| 102 // |YYYY| 103 // |YYYY| 104 // I16HE16 |YYYY| 105 // |YYYY| 106 // |YYYY| 107 // |YYYY| 108 // +----+ Chroma U/V predictions (16x8 block each) 109 // C8DC8 |UUVV| 110 // |UUVV| 111 // C8TM8 |UUVV| 112 // |UUVV| 113 // C8VE8 |UUVV| 114 // |UUVV| 115 // C8HE8 |UUVV| 116 // |UUVV| 117 // +----+ Intra 4x4 predictions (4x4 block each) 118 // |YYYY| I4DC4 I4TM4 I4VE4 I4HE4 119 // |YYYY| I4RD4 I4VR4 I4LD4 I4VL4 120 // |YY..| I4HD4 I4HU4 I4TMP 121 // +----+ 122 #define BPS 16 // this is the common stride 123 #define Y_SIZE (BPS * 16) 124 #define UV_SIZE (BPS * 8) 125 #define YUV_SIZE (Y_SIZE + UV_SIZE) 126 #define PRED_SIZE (6 * 16 * BPS + 12 * BPS) 127 #define Y_OFF (0) 128 #define U_OFF (Y_SIZE) 129 #define V_OFF (U_OFF + 8) 130 #define ALIGN_CST 15 131 #define DO_ALIGN(PTR) ((uintptr_t)((PTR) + ALIGN_CST) & ~ALIGN_CST) 132 133 extern const int VP8Scan[16 + 4 + 4]; // in quant.c 134 extern const int VP8UVModeOffsets[4]; // in analyze.c 135 extern const int VP8I16ModeOffsets[4]; 136 extern const int VP8I4ModeOffsets[NUM_BMODES]; 137 138 // Layout of prediction blocks 139 // intra 16x16 140 #define I16DC16 (0 * 16 * BPS) 141 #define I16TM16 (1 * 16 * BPS) 142 #define I16VE16 (2 * 16 * BPS) 143 #define I16HE16 (3 * 16 * BPS) 144 // chroma 8x8, two U/V blocks side by side (hence: 16x8 each) 145 #define C8DC8 (4 * 16 * BPS) 146 #define C8TM8 (4 * 16 * BPS + 8 * BPS) 147 #define C8VE8 (5 * 16 * BPS) 148 #define C8HE8 (5 * 16 * BPS + 8 * BPS) 149 // intra 4x4 150 #define I4DC4 (6 * 16 * BPS + 0) 151 #define I4TM4 (6 * 16 * BPS + 4) 152 #define I4VE4 (6 * 16 * BPS + 8) 153 #define I4HE4 (6 * 16 * BPS + 12) 154 #define I4RD4 (6 * 16 * BPS + 4 * BPS + 0) 155 #define I4VR4 (6 * 16 * BPS + 4 * BPS + 4) 156 #define I4LD4 (6 * 16 * BPS + 4 * BPS + 8) 157 #define I4VL4 (6 * 16 * BPS + 4 * BPS + 12) 158 #define I4HD4 (6 * 16 * BPS + 8 * BPS + 0) 159 #define I4HU4 (6 * 16 * BPS + 8 * BPS + 4) 160 #define I4TMP (6 * 16 * BPS + 8 * BPS + 8) 161 162 typedef int64_t score_t; // type used for scores, rate, distortion 163 #define MAX_COST ((score_t)0x7fffffffffffffLL) 164 165 #define QFIX 17 166 #define BIAS(b) ((b) << (QFIX - 8)) 167 // Fun fact: this is the _only_ line where we're actually being lossy and 168 // discarding bits. 169 static WEBP_INLINE int QUANTDIV(int n, int iQ, int B) { 170 return (n * iQ + B) >> QFIX; 171 } 172 173 // size of histogram used by CollectHistogram. 174 #define MAX_COEFF_THRESH 31 175 typedef struct VP8Histogram VP8Histogram; 176 struct VP8Histogram { 177 // TODO(skal): we only need to store the max_value and last_non_zero actually. 178 int distribution[MAX_COEFF_THRESH + 1]; 179 }; 180 181 // Uncomment the following to remove token-buffer code: 182 // #define DISABLE_TOKEN_BUFFER 183 184 //------------------------------------------------------------------------------ 185 // Headers 186 187 typedef uint32_t proba_t; // 16b + 16b 188 typedef uint8_t ProbaArray[NUM_CTX][NUM_PROBAS]; 189 typedef proba_t StatsArray[NUM_CTX][NUM_PROBAS]; 190 typedef uint16_t CostArray[NUM_CTX][MAX_VARIABLE_LEVEL + 1]; 191 typedef double LFStats[NUM_MB_SEGMENTS][MAX_LF_LEVELS]; // filter stats 192 193 typedef struct VP8Encoder VP8Encoder; 194 195 // segment features 196 typedef struct { 197 int num_segments_; // Actual number of segments. 1 segment only = unused. 198 int update_map_; // whether to update the segment map or not. 199 // must be 0 if there's only 1 segment. 200 int size_; // bit-cost for transmitting the segment map 201 } VP8SegmentHeader; 202 203 // Struct collecting all frame-persistent probabilities. 204 typedef struct { 205 uint8_t segments_[3]; // probabilities for segment tree 206 uint8_t skip_proba_; // final probability of being skipped. 207 ProbaArray coeffs_[NUM_TYPES][NUM_BANDS]; // 924 bytes 208 StatsArray stats_[NUM_TYPES][NUM_BANDS]; // 4224 bytes 209 CostArray level_cost_[NUM_TYPES][NUM_BANDS]; // 11.4k 210 int dirty_; // if true, need to call VP8CalculateLevelCosts() 211 int use_skip_proba_; // Note: we always use skip_proba for now. 212 int nb_skip_; // number of skipped blocks 213 } VP8Proba; 214 215 // Filter parameters. Not actually used in the code (we don't perform 216 // the in-loop filtering), but filled from user's config 217 typedef struct { 218 int simple_; // filtering type: 0=complex, 1=simple 219 int level_; // base filter level [0..63] 220 int sharpness_; // [0..7] 221 int i4x4_lf_delta_; // delta filter level for i4x4 relative to i16x16 222 } VP8FilterHeader; 223 224 //------------------------------------------------------------------------------ 225 // Informations about the macroblocks. 226 227 typedef struct { 228 // block type 229 unsigned int type_:2; // 0=i4x4, 1=i16x16 230 unsigned int uv_mode_:2; 231 unsigned int skip_:1; 232 unsigned int segment_:2; 233 uint8_t alpha_; // quantization-susceptibility 234 } VP8MBInfo; 235 236 typedef struct VP8Matrix { 237 uint16_t q_[16]; // quantizer steps 238 uint16_t iq_[16]; // reciprocals, fixed point. 239 uint16_t bias_[16]; // rounding bias 240 uint16_t zthresh_[16]; // value under which a coefficient is zeroed 241 uint16_t sharpen_[16]; // frequency boosters for slight sharpening 242 } VP8Matrix; 243 244 typedef struct { 245 VP8Matrix y1_, y2_, uv_; // quantization matrices 246 int alpha_; // quant-susceptibility, range [-127,127]. Zero is neutral. 247 // Lower values indicate a lower risk of blurriness. 248 int beta_; // filter-susceptibility, range [0,255]. 249 int quant_; // final segment quantizer. 250 int fstrength_; // final in-loop filtering strength 251 // reactivities 252 int lambda_i16_, lambda_i4_, lambda_uv_; 253 int lambda_mode_, lambda_trellis_, tlambda_; 254 int lambda_trellis_i16_, lambda_trellis_i4_, lambda_trellis_uv_; 255 } VP8SegmentInfo; 256 257 // Handy transcient struct to accumulate score and info during RD-optimization 258 // and mode evaluation. 259 typedef struct { 260 score_t D, SD, R, score; // Distortion, spectral distortion, rate, score. 261 int16_t y_dc_levels[16]; // Quantized levels for luma-DC, luma-AC, chroma. 262 int16_t y_ac_levels[16][16]; 263 int16_t uv_levels[4 + 4][16]; 264 int mode_i16; // mode number for intra16 prediction 265 uint8_t modes_i4[16]; // mode numbers for intra4 predictions 266 int mode_uv; // mode number of chroma prediction 267 uint32_t nz; // non-zero blocks 268 } VP8ModeScore; 269 270 // Iterator structure to iterate through macroblocks, pointing to the 271 // right neighbouring data (samples, predictions, contexts, ...) 272 typedef struct { 273 int x_, y_; // current macroblock 274 int y_offset_, uv_offset_; // offset to the luma / chroma planes 275 int y_stride_, uv_stride_; // respective strides 276 uint8_t* yuv_in_; // borrowed from enc_ (for now) 277 uint8_t* yuv_out_; // '' 278 uint8_t* yuv_out2_; // '' 279 uint8_t* yuv_p_; // '' 280 VP8Encoder* enc_; // back-pointer 281 VP8MBInfo* mb_; // current macroblock 282 VP8BitWriter* bw_; // current bit-writer 283 uint8_t* preds_; // intra mode predictors (4x4 blocks) 284 uint32_t* nz_; // non-zero pattern 285 uint8_t i4_boundary_[37]; // 32+5 boundary samples needed by intra4x4 286 uint8_t* i4_top_; // pointer to the current top boundary sample 287 int i4_; // current intra4x4 mode being tested 288 int top_nz_[9]; // top-non-zero context. 289 int left_nz_[9]; // left-non-zero. left_nz[8] is independent. 290 uint64_t bit_count_[4][3]; // bit counters for coded levels. 291 uint64_t luma_bits_; // macroblock bit-cost for luma 292 uint64_t uv_bits_; // macroblock bit-cost for chroma 293 LFStats* lf_stats_; // filter stats (borrowed from enc_) 294 int do_trellis_; // if true, perform extra level optimisation 295 int done_; // true when scan is finished 296 int percent0_; // saved initial progress percent 297 } VP8EncIterator; 298 299 // in iterator.c 300 // must be called first. 301 void VP8IteratorInit(VP8Encoder* const enc, VP8EncIterator* const it); 302 // restart a scan. 303 void VP8IteratorReset(VP8EncIterator* const it); 304 // import samples from source 305 void VP8IteratorImport(const VP8EncIterator* const it); 306 // export decimated samples 307 void VP8IteratorExport(const VP8EncIterator* const it); 308 // go to next macroblock. Returns !done_. If *block_to_save is non-null, will 309 // save the boundary values to top_/left_ arrays. block_to_save can be 310 // it->yuv_out_ or it->yuv_in_. 311 int VP8IteratorNext(VP8EncIterator* const it, 312 const uint8_t* const block_to_save); 313 // Report progression based on macroblock rows. Return 0 for user-abort request. 314 int VP8IteratorProgress(const VP8EncIterator* const it, 315 int final_delta_percent); 316 // Intra4x4 iterations 317 void VP8IteratorStartI4(VP8EncIterator* const it); 318 // returns true if not done. 319 int VP8IteratorRotateI4(VP8EncIterator* const it, 320 const uint8_t* const yuv_out); 321 322 // Non-zero context setup/teardown 323 void VP8IteratorNzToBytes(VP8EncIterator* const it); 324 void VP8IteratorBytesToNz(VP8EncIterator* const it); 325 326 // Helper functions to set mode properties 327 void VP8SetIntra16Mode(const VP8EncIterator* const it, int mode); 328 void VP8SetIntra4Mode(const VP8EncIterator* const it, const uint8_t* modes); 329 void VP8SetIntraUVMode(const VP8EncIterator* const it, int mode); 330 void VP8SetSkip(const VP8EncIterator* const it, int skip); 331 void VP8SetSegment(const VP8EncIterator* const it, int segment); 332 333 //------------------------------------------------------------------------------ 334 // Paginated token buffer 335 336 typedef struct VP8Tokens VP8Tokens; // struct details in token.c 337 338 typedef struct { 339 #if !defined(DISABLE_TOKEN_BUFFER) 340 VP8Tokens* pages_; // first page 341 VP8Tokens** last_page_; // last page 342 uint16_t* tokens_; // set to (*last_page_)->tokens_ 343 int left_; // how many free tokens left before the page is full. 344 #endif 345 int error_; // true in case of malloc error 346 } VP8TBuffer; 347 348 void VP8TBufferInit(VP8TBuffer* const b); // initialize an empty buffer 349 void VP8TBufferClear(VP8TBuffer* const b); // de-allocate pages memory 350 351 #if !defined(DISABLE_TOKEN_BUFFER) 352 353 // Finalizes bitstream when probabilities are known. 354 // Deletes the allocated token memory if final_pass is true. 355 int VP8EmitTokens(VP8TBuffer* const b, VP8BitWriter* const bw, 356 const uint8_t* const probas, int final_pass); 357 358 // record the coding of coefficients without knowing the probabilities yet 359 int VP8RecordCoeffTokens(int ctx, int coeff_type, int first, int last, 360 const int16_t* const coeffs, 361 VP8TBuffer* const tokens); 362 363 // unused for now 364 void VP8TokenToStats(const VP8TBuffer* const b, proba_t* const stats); 365 366 #endif // !DISABLE_TOKEN_BUFFER 367 368 //------------------------------------------------------------------------------ 369 // VP8Encoder 370 371 struct VP8Encoder { 372 const WebPConfig* config_; // user configuration and parameters 373 WebPPicture* pic_; // input / output picture 374 375 // headers 376 VP8FilterHeader filter_hdr_; // filtering information 377 VP8SegmentHeader segment_hdr_; // segment information 378 379 int profile_; // VP8's profile, deduced from Config. 380 381 // dimension, in macroblock units. 382 int mb_w_, mb_h_; 383 int preds_w_; // stride of the *preds_ prediction plane (=4*mb_w + 1) 384 385 // number of partitions (1, 2, 4 or 8 = MAX_NUM_PARTITIONS) 386 int num_parts_; 387 388 // per-partition boolean decoders. 389 VP8BitWriter bw_; // part0 390 VP8BitWriter parts_[MAX_NUM_PARTITIONS]; // token partitions 391 VP8TBuffer tokens_; // token buffer 392 393 int percent_; // for progress 394 395 // transparency blob 396 int has_alpha_; 397 uint8_t* alpha_data_; // non-NULL if transparency is present 398 uint32_t alpha_data_size_; 399 WebPWorker alpha_worker_; 400 401 // enhancement layer 402 int use_layer_; 403 VP8BitWriter layer_bw_; 404 uint8_t* layer_data_; 405 size_t layer_data_size_; 406 407 // quantization info (one set of DC/AC dequant factor per segment) 408 VP8SegmentInfo dqm_[NUM_MB_SEGMENTS]; 409 int base_quant_; // nominal quantizer value. Only used 410 // for relative coding of segments' quant. 411 int alpha_; // global susceptibility (<=> complexity) 412 int uv_alpha_; // U/V quantization susceptibility 413 // global offset of quantizers, shared by all segments 414 int dq_y1_dc_; 415 int dq_y2_dc_, dq_y2_ac_; 416 int dq_uv_dc_, dq_uv_ac_; 417 418 // probabilities and statistics 419 VP8Proba proba_; 420 uint64_t sse_[4]; // sum of Y/U/V/A squared errors for all macroblocks 421 uint64_t sse_count_; // pixel count for the sse_[] stats 422 int coded_size_; 423 int residual_bytes_[3][4]; 424 int block_count_[3]; 425 426 // quality/speed settings 427 int method_; // 0=fastest, 6=best/slowest. 428 VP8RDLevel rd_opt_level_; // Deduced from method_. 429 int max_i4_header_bits_; // partition #0 safeness factor 430 int thread_level_; // derived from config->thread_level 431 int do_search_; // derived from config->target_XXX 432 int use_tokens_; // if true, use token buffer 433 434 // Memory 435 VP8MBInfo* mb_info_; // contextual macroblock infos (mb_w_ + 1) 436 uint8_t* preds_; // predictions modes: (4*mb_w+1) * (4*mb_h+1) 437 uint32_t* nz_; // non-zero bit context: mb_w+1 438 uint8_t* yuv_in_; // input samples 439 uint8_t* yuv_out_; // output samples 440 uint8_t* yuv_out2_; // secondary scratch out-buffer. swapped with yuv_out_. 441 uint8_t* yuv_p_; // scratch buffer for prediction 442 uint8_t *y_top_; // top luma samples. 443 uint8_t *uv_top_; // top u/v samples. 444 // U and V are packed into 16 pixels (8 U + 8 V) 445 uint8_t *y_left_; // left luma samples (adressable from index -1 to 15). 446 uint8_t *u_left_; // left u samples (adressable from index -1 to 7) 447 uint8_t *v_left_; // left v samples (adressable from index -1 to 7) 448 449 LFStats *lf_stats_; // autofilter stats (if NULL, autofilter is off) 450 }; 451 452 //------------------------------------------------------------------------------ 453 // internal functions. Not public. 454 455 // in tree.c 456 extern const uint8_t VP8CoeffsProba0[NUM_TYPES][NUM_BANDS][NUM_CTX][NUM_PROBAS]; 457 extern const uint8_t 458 VP8CoeffsUpdateProba[NUM_TYPES][NUM_BANDS][NUM_CTX][NUM_PROBAS]; 459 // Reset the token probabilities to their initial (default) values 460 void VP8DefaultProbas(VP8Encoder* const enc); 461 // Write the token probabilities 462 void VP8WriteProbas(VP8BitWriter* const bw, const VP8Proba* const probas); 463 // Writes the partition #0 modes (that is: all intra modes) 464 void VP8CodeIntraModes(VP8Encoder* const enc); 465 466 // in syntax.c 467 // Generates the final bitstream by coding the partition0 and headers, 468 // and appending an assembly of all the pre-coded token partitions. 469 // Return true if everything is ok. 470 int VP8EncWrite(VP8Encoder* const enc); 471 // Release memory allocated for bit-writing in VP8EncLoop & seq. 472 void VP8EncFreeBitWriters(VP8Encoder* const enc); 473 474 // in frame.c 475 extern const uint8_t VP8EncBands[16 + 1]; 476 extern const uint8_t VP8Cat3[]; 477 extern const uint8_t VP8Cat4[]; 478 extern const uint8_t VP8Cat5[]; 479 extern const uint8_t VP8Cat6[]; 480 481 // Form all the four Intra16x16 predictions in the yuv_p_ cache 482 void VP8MakeLuma16Preds(const VP8EncIterator* const it); 483 // Form all the four Chroma8x8 predictions in the yuv_p_ cache 484 void VP8MakeChroma8Preds(const VP8EncIterator* const it); 485 // Form all the ten Intra4x4 predictions in the yuv_p_ cache 486 // for the 4x4 block it->i4_ 487 void VP8MakeIntra4Preds(const VP8EncIterator* const it); 488 // Rate calculation 489 int VP8GetCostLuma16(VP8EncIterator* const it, const VP8ModeScore* const rd); 490 int VP8GetCostLuma4(VP8EncIterator* const it, const int16_t levels[16]); 491 int VP8GetCostUV(VP8EncIterator* const it, const VP8ModeScore* const rd); 492 // Main coding calls 493 int VP8EncLoop(VP8Encoder* const enc); 494 int VP8EncTokenLoop(VP8Encoder* const enc); 495 496 // in webpenc.c 497 // Assign an error code to a picture. Return false for convenience. 498 int WebPEncodingSetError(const WebPPicture* const pic, WebPEncodingError error); 499 int WebPReportProgress(const WebPPicture* const pic, 500 int percent, int* const percent_store); 501 502 // in analysis.c 503 // Main analysis loop. Decides the segmentations and complexity. 504 // Assigns a first guess for Intra16 and uvmode_ prediction modes. 505 int VP8EncAnalyze(VP8Encoder* const enc); 506 507 // in quant.c 508 // Sets up segment's quantization values, base_quant_ and filter strengths. 509 void VP8SetSegmentParams(VP8Encoder* const enc, float quality); 510 // Pick best modes and fills the levels. Returns true if skipped. 511 int VP8Decimate(VP8EncIterator* const it, VP8ModeScore* const rd, 512 VP8RDLevel rd_opt); 513 514 // in alpha.c 515 void VP8EncInitAlpha(VP8Encoder* const enc); // initialize alpha compression 516 int VP8EncStartAlpha(VP8Encoder* const enc); // start alpha coding process 517 int VP8EncFinishAlpha(VP8Encoder* const enc); // finalize compressed data 518 int VP8EncDeleteAlpha(VP8Encoder* const enc); // delete compressed data 519 520 // in layer.c 521 void VP8EncInitLayer(VP8Encoder* const enc); // init everything 522 void VP8EncCodeLayerBlock(VP8EncIterator* it); // code one more macroblock 523 int VP8EncFinishLayer(VP8Encoder* const enc); // finalize coding 524 void VP8EncDeleteLayer(VP8Encoder* enc); // reclaim memory 525 526 // in filter.c 527 528 // SSIM utils 529 typedef struct { 530 double w, xm, ym, xxm, xym, yym; 531 } DistoStats; 532 void VP8SSIMAddStats(const DistoStats* const src, DistoStats* const dst); 533 void VP8SSIMAccumulatePlane(const uint8_t* src1, int stride1, 534 const uint8_t* src2, int stride2, 535 int W, int H, DistoStats* const stats); 536 double VP8SSIMGet(const DistoStats* const stats); 537 double VP8SSIMGetSquaredError(const DistoStats* const stats); 538 539 // autofilter 540 void VP8InitFilter(VP8EncIterator* const it); 541 void VP8StoreFilterStats(VP8EncIterator* const it); 542 void VP8AdjustFilterStrength(VP8EncIterator* const it); 543 544 //------------------------------------------------------------------------------ 545 546 #if defined(__cplusplus) || defined(c_plusplus) 547 } // extern "C" 548 #endif 549 550 #endif /* WEBP_ENC_VP8ENCI_H_ */ 551
