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_VP8I_ENC_H_ 15 #define WEBP_ENC_VP8I_ENC_H_ 16 17 #include <string.h> // for memcpy() 18 #include "src/dec/common_dec.h" 19 #include "src/dsp/dsp.h" 20 #include "src/utils/bit_writer_utils.h" 21 #include "src/utils/thread_utils.h" 22 #include "src/utils/utils.h" 23 #include "src/webp/encode.h" 24 25 #ifdef __cplusplus 26 extern "C" { 27 #endif 28 29 //------------------------------------------------------------------------------ 30 // Various defines and enums 31 32 // version numbers 33 #define ENC_MAJ_VERSION 0 34 #define ENC_MIN_VERSION 6 35 #define ENC_REV_VERSION 1 36 37 enum { MAX_LF_LEVELS = 64, // Maximum loop filter level 38 MAX_VARIABLE_LEVEL = 67, // last (inclusive) level with variable cost 39 MAX_LEVEL = 2047 // max level (note: max codable is 2047 + 67) 40 }; 41 42 typedef enum { // Rate-distortion optimization levels 43 RD_OPT_NONE = 0, // no rd-opt 44 RD_OPT_BASIC = 1, // basic scoring (no trellis) 45 RD_OPT_TRELLIS = 2, // perform trellis-quant on the final decision only 46 RD_OPT_TRELLIS_ALL = 3 // trellis-quant for every scoring (much slower) 47 } VP8RDLevel; 48 49 // YUV-cache parameters. Cache is 32-bytes wide (= one cacheline). 50 // The original or reconstructed samples can be accessed using VP8Scan[]. 51 // The predicted blocks can be accessed using offsets to yuv_p_ and 52 // the arrays VP8*ModeOffsets[]. 53 // * YUV Samples area (yuv_in_/yuv_out_/yuv_out2_) 54 // (see VP8Scan[] for accessing the blocks, along with 55 // Y_OFF_ENC/U_OFF_ENC/V_OFF_ENC): 56 // +----+----+ 57 // Y_OFF_ENC |YYYY|UUVV| 58 // U_OFF_ENC |YYYY|UUVV| 59 // V_OFF_ENC |YYYY|....| <- 25% wasted U/V area 60 // |YYYY|....| 61 // +----+----+ 62 // * Prediction area ('yuv_p_', size = PRED_SIZE_ENC) 63 // Intra16 predictions (16x16 block each, two per row): 64 // |I16DC16|I16TM16| 65 // |I16VE16|I16HE16| 66 // Chroma U/V predictions (16x8 block each, two per row): 67 // |C8DC8|C8TM8| 68 // |C8VE8|C8HE8| 69 // Intra 4x4 predictions (4x4 block each) 70 // |I4DC4 I4TM4 I4VE4 I4HE4|I4RD4 I4VR4 I4LD4 I4VL4| 71 // |I4HD4 I4HU4 I4TMP .....|.......................| <- ~31% wasted 72 #define YUV_SIZE_ENC (BPS * 16) 73 #define PRED_SIZE_ENC (32 * BPS + 16 * BPS + 8 * BPS) // I16+Chroma+I4 preds 74 #define Y_OFF_ENC (0) 75 #define U_OFF_ENC (16) 76 #define V_OFF_ENC (16 + 8) 77 78 extern const uint16_t VP8Scan[16]; 79 extern const uint16_t VP8UVModeOffsets[4]; 80 extern const uint16_t VP8I16ModeOffsets[4]; 81 extern const uint16_t VP8I4ModeOffsets[NUM_BMODES]; 82 83 // Layout of prediction blocks 84 // intra 16x16 85 #define I16DC16 (0 * 16 * BPS) 86 #define I16TM16 (I16DC16 + 16) 87 #define I16VE16 (1 * 16 * BPS) 88 #define I16HE16 (I16VE16 + 16) 89 // chroma 8x8, two U/V blocks side by side (hence: 16x8 each) 90 #define C8DC8 (2 * 16 * BPS) 91 #define C8TM8 (C8DC8 + 1 * 16) 92 #define C8VE8 (2 * 16 * BPS + 8 * BPS) 93 #define C8HE8 (C8VE8 + 1 * 16) 94 // intra 4x4 95 #define I4DC4 (3 * 16 * BPS + 0) 96 #define I4TM4 (I4DC4 + 4) 97 #define I4VE4 (I4DC4 + 8) 98 #define I4HE4 (I4DC4 + 12) 99 #define I4RD4 (I4DC4 + 16) 100 #define I4VR4 (I4DC4 + 20) 101 #define I4LD4 (I4DC4 + 24) 102 #define I4VL4 (I4DC4 + 28) 103 #define I4HD4 (3 * 16 * BPS + 4 * BPS) 104 #define I4HU4 (I4HD4 + 4) 105 #define I4TMP (I4HD4 + 8) 106 107 typedef int64_t score_t; // type used for scores, rate, distortion 108 // Note that MAX_COST is not the maximum allowed by sizeof(score_t), 109 // in order to allow overflowing computations. 110 #define MAX_COST ((score_t)0x7fffffffffffffLL) 111 112 #define QFIX 17 113 #define BIAS(b) ((b) << (QFIX - 8)) 114 // Fun fact: this is the _only_ line where we're actually being lossy and 115 // discarding bits. 116 static WEBP_INLINE int QUANTDIV(uint32_t n, uint32_t iQ, uint32_t B) { 117 return (int)((n * iQ + B) >> QFIX); 118 } 119 120 // Uncomment the following to remove token-buffer code: 121 // #define DISABLE_TOKEN_BUFFER 122 123 //------------------------------------------------------------------------------ 124 // Headers 125 126 typedef uint32_t proba_t; // 16b + 16b 127 typedef uint8_t ProbaArray[NUM_CTX][NUM_PROBAS]; 128 typedef proba_t StatsArray[NUM_CTX][NUM_PROBAS]; 129 typedef uint16_t CostArray[NUM_CTX][MAX_VARIABLE_LEVEL + 1]; 130 typedef const uint16_t* (*CostArrayPtr)[NUM_CTX]; // for easy casting 131 typedef const uint16_t* CostArrayMap[16][NUM_CTX]; 132 typedef double LFStats[NUM_MB_SEGMENTS][MAX_LF_LEVELS]; // filter stats 133 134 typedef struct VP8Encoder VP8Encoder; 135 136 // segment features 137 typedef struct { 138 int num_segments_; // Actual number of segments. 1 segment only = unused. 139 int update_map_; // whether to update the segment map or not. 140 // must be 0 if there's only 1 segment. 141 int size_; // bit-cost for transmitting the segment map 142 } VP8EncSegmentHeader; 143 144 // Struct collecting all frame-persistent probabilities. 145 typedef struct { 146 uint8_t segments_[3]; // probabilities for segment tree 147 uint8_t skip_proba_; // final probability of being skipped. 148 ProbaArray coeffs_[NUM_TYPES][NUM_BANDS]; // 1056 bytes 149 StatsArray stats_[NUM_TYPES][NUM_BANDS]; // 4224 bytes 150 CostArray level_cost_[NUM_TYPES][NUM_BANDS]; // 13056 bytes 151 CostArrayMap remapped_costs_[NUM_TYPES]; // 1536 bytes 152 int dirty_; // if true, need to call VP8CalculateLevelCosts() 153 int use_skip_proba_; // Note: we always use skip_proba for now. 154 int nb_skip_; // number of skipped blocks 155 } VP8EncProba; 156 157 // Filter parameters. Not actually used in the code (we don't perform 158 // the in-loop filtering), but filled from user's config 159 typedef struct { 160 int simple_; // filtering type: 0=complex, 1=simple 161 int level_; // base filter level [0..63] 162 int sharpness_; // [0..7] 163 int i4x4_lf_delta_; // delta filter level for i4x4 relative to i16x16 164 } VP8EncFilterHeader; 165 166 //------------------------------------------------------------------------------ 167 // Informations about the macroblocks. 168 169 typedef struct { 170 // block type 171 unsigned int type_:2; // 0=i4x4, 1=i16x16 172 unsigned int uv_mode_:2; 173 unsigned int skip_:1; 174 unsigned int segment_:2; 175 uint8_t alpha_; // quantization-susceptibility 176 } VP8MBInfo; 177 178 typedef struct VP8Matrix { 179 uint16_t q_[16]; // quantizer steps 180 uint16_t iq_[16]; // reciprocals, fixed point. 181 uint32_t bias_[16]; // rounding bias 182 uint32_t zthresh_[16]; // value below which a coefficient is zeroed 183 uint16_t sharpen_[16]; // frequency boosters for slight sharpening 184 } VP8Matrix; 185 186 typedef struct { 187 VP8Matrix y1_, y2_, uv_; // quantization matrices 188 int alpha_; // quant-susceptibility, range [-127,127]. Zero is neutral. 189 // Lower values indicate a lower risk of blurriness. 190 int beta_; // filter-susceptibility, range [0,255]. 191 int quant_; // final segment quantizer. 192 int fstrength_; // final in-loop filtering strength 193 int max_edge_; // max edge delta (for filtering strength) 194 int min_disto_; // minimum distortion required to trigger filtering record 195 // reactivities 196 int lambda_i16_, lambda_i4_, lambda_uv_; 197 int lambda_mode_, lambda_trellis_, tlambda_; 198 int lambda_trellis_i16_, lambda_trellis_i4_, lambda_trellis_uv_; 199 200 // lambda values for distortion-based evaluation 201 score_t i4_penalty_; // penalty for using Intra4 202 } VP8SegmentInfo; 203 204 // Handy transient struct to accumulate score and info during RD-optimization 205 // and mode evaluation. 206 typedef struct { 207 score_t D, SD; // Distortion, spectral distortion 208 score_t H, R, score; // header bits, rate, score. 209 int16_t y_dc_levels[16]; // Quantized levels for luma-DC, luma-AC, chroma. 210 int16_t y_ac_levels[16][16]; 211 int16_t uv_levels[4 + 4][16]; 212 int mode_i16; // mode number for intra16 prediction 213 uint8_t modes_i4[16]; // mode numbers for intra4 predictions 214 int mode_uv; // mode number of chroma prediction 215 uint32_t nz; // non-zero blocks 216 } VP8ModeScore; 217 218 // Iterator structure to iterate through macroblocks, pointing to the 219 // right neighbouring data (samples, predictions, contexts, ...) 220 typedef struct { 221 int x_, y_; // current macroblock 222 uint8_t* yuv_in_; // input samples 223 uint8_t* yuv_out_; // output samples 224 uint8_t* yuv_out2_; // secondary buffer swapped with yuv_out_. 225 uint8_t* yuv_p_; // scratch buffer for prediction 226 VP8Encoder* enc_; // back-pointer 227 VP8MBInfo* mb_; // current macroblock 228 VP8BitWriter* bw_; // current bit-writer 229 uint8_t* preds_; // intra mode predictors (4x4 blocks) 230 uint32_t* nz_; // non-zero pattern 231 uint8_t i4_boundary_[37]; // 32+5 boundary samples needed by intra4x4 232 uint8_t* i4_top_; // pointer to the current top boundary sample 233 int i4_; // current intra4x4 mode being tested 234 int top_nz_[9]; // top-non-zero context. 235 int left_nz_[9]; // left-non-zero. left_nz[8] is independent. 236 uint64_t bit_count_[4][3]; // bit counters for coded levels. 237 uint64_t luma_bits_; // macroblock bit-cost for luma 238 uint64_t uv_bits_; // macroblock bit-cost for chroma 239 LFStats* lf_stats_; // filter stats (borrowed from enc_) 240 int do_trellis_; // if true, perform extra level optimisation 241 int count_down_; // number of mb still to be processed 242 int count_down0_; // starting counter value (for progress) 243 int percent0_; // saved initial progress percent 244 245 uint8_t* y_left_; // left luma samples (addressable from index -1 to 15). 246 uint8_t* u_left_; // left u samples (addressable from index -1 to 7) 247 uint8_t* v_left_; // left v samples (addressable from index -1 to 7) 248 249 uint8_t* y_top_; // top luma samples at position 'x_' 250 uint8_t* uv_top_; // top u/v samples at position 'x_', packed as 16 bytes 251 252 // memory for storing y/u/v_left_ 253 uint8_t yuv_left_mem_[17 + 16 + 16 + 8 + WEBP_ALIGN_CST]; 254 // memory for yuv_* 255 uint8_t yuv_mem_[3 * YUV_SIZE_ENC + PRED_SIZE_ENC + WEBP_ALIGN_CST]; 256 } VP8EncIterator; 257 258 // in iterator.c 259 // must be called first 260 void VP8IteratorInit(VP8Encoder* const enc, VP8EncIterator* const it); 261 // restart a scan 262 void VP8IteratorReset(VP8EncIterator* const it); 263 // reset iterator position to row 'y' 264 void VP8IteratorSetRow(VP8EncIterator* const it, int y); 265 // set count down (=number of iterations to go) 266 void VP8IteratorSetCountDown(VP8EncIterator* const it, int count_down); 267 // return true if iteration is finished 268 int VP8IteratorIsDone(const VP8EncIterator* const it); 269 // Import uncompressed samples from source. 270 // If tmp_32 is not NULL, import boundary samples too. 271 // tmp_32 is a 32-bytes scratch buffer that must be aligned in memory. 272 void VP8IteratorImport(VP8EncIterator* const it, uint8_t* tmp_32); 273 // export decimated samples 274 void VP8IteratorExport(const VP8EncIterator* const it); 275 // go to next macroblock. Returns false if not finished. 276 int VP8IteratorNext(VP8EncIterator* const it); 277 // save the yuv_out_ boundary values to top_/left_ arrays for next iterations. 278 void VP8IteratorSaveBoundary(VP8EncIterator* const it); 279 // Report progression based on macroblock rows. Return 0 for user-abort request. 280 int VP8IteratorProgress(const VP8EncIterator* const it, 281 int final_delta_percent); 282 // Intra4x4 iterations 283 void VP8IteratorStartI4(VP8EncIterator* const it); 284 // returns true if not done. 285 int VP8IteratorRotateI4(VP8EncIterator* const it, 286 const uint8_t* const yuv_out); 287 288 // Non-zero context setup/teardown 289 void VP8IteratorNzToBytes(VP8EncIterator* const it); 290 void VP8IteratorBytesToNz(VP8EncIterator* const it); 291 292 // Helper functions to set mode properties 293 void VP8SetIntra16Mode(const VP8EncIterator* const it, int mode); 294 void VP8SetIntra4Mode(const VP8EncIterator* const it, const uint8_t* modes); 295 void VP8SetIntraUVMode(const VP8EncIterator* const it, int mode); 296 void VP8SetSkip(const VP8EncIterator* const it, int skip); 297 void VP8SetSegment(const VP8EncIterator* const it, int segment); 298 299 //------------------------------------------------------------------------------ 300 // Paginated token buffer 301 302 typedef struct VP8Tokens VP8Tokens; // struct details in token.c 303 304 typedef struct { 305 #if !defined(DISABLE_TOKEN_BUFFER) 306 VP8Tokens* pages_; // first page 307 VP8Tokens** last_page_; // last page 308 uint16_t* tokens_; // set to (*last_page_)->tokens_ 309 int left_; // how many free tokens left before the page is full 310 int page_size_; // number of tokens per page 311 #endif 312 int error_; // true in case of malloc error 313 } VP8TBuffer; 314 315 // initialize an empty buffer 316 void VP8TBufferInit(VP8TBuffer* const b, int page_size); 317 void VP8TBufferClear(VP8TBuffer* const b); // de-allocate pages memory 318 319 #if !defined(DISABLE_TOKEN_BUFFER) 320 321 // Finalizes bitstream when probabilities are known. 322 // Deletes the allocated token memory if final_pass is true. 323 int VP8EmitTokens(VP8TBuffer* const b, VP8BitWriter* const bw, 324 const uint8_t* const probas, int final_pass); 325 326 // record the coding of coefficients without knowing the probabilities yet 327 int VP8RecordCoeffTokens(int ctx, const struct VP8Residual* const res, 328 VP8TBuffer* const tokens); 329 330 // Estimate the final coded size given a set of 'probas'. 331 size_t VP8EstimateTokenSize(VP8TBuffer* const b, const uint8_t* const probas); 332 333 #endif // !DISABLE_TOKEN_BUFFER 334 335 //------------------------------------------------------------------------------ 336 // VP8Encoder 337 338 struct VP8Encoder { 339 const WebPConfig* config_; // user configuration and parameters 340 WebPPicture* pic_; // input / output picture 341 342 // headers 343 VP8EncFilterHeader filter_hdr_; // filtering information 344 VP8EncSegmentHeader segment_hdr_; // segment information 345 346 int profile_; // VP8's profile, deduced from Config. 347 348 // dimension, in macroblock units. 349 int mb_w_, mb_h_; 350 int preds_w_; // stride of the *preds_ prediction plane (=4*mb_w + 1) 351 352 // number of partitions (1, 2, 4 or 8 = MAX_NUM_PARTITIONS) 353 int num_parts_; 354 355 // per-partition boolean decoders. 356 VP8BitWriter bw_; // part0 357 VP8BitWriter parts_[MAX_NUM_PARTITIONS]; // token partitions 358 VP8TBuffer tokens_; // token buffer 359 360 int percent_; // for progress 361 362 // transparency blob 363 int has_alpha_; 364 uint8_t* alpha_data_; // non-NULL if transparency is present 365 uint32_t alpha_data_size_; 366 WebPWorker alpha_worker_; 367 368 // quantization info (one set of DC/AC dequant factor per segment) 369 VP8SegmentInfo dqm_[NUM_MB_SEGMENTS]; 370 int base_quant_; // nominal quantizer value. Only used 371 // for relative coding of segments' quant. 372 int alpha_; // global susceptibility (<=> complexity) 373 int uv_alpha_; // U/V quantization susceptibility 374 // global offset of quantizers, shared by all segments 375 int dq_y1_dc_; 376 int dq_y2_dc_, dq_y2_ac_; 377 int dq_uv_dc_, dq_uv_ac_; 378 379 // probabilities and statistics 380 VP8EncProba proba_; 381 uint64_t sse_[4]; // sum of Y/U/V/A squared errors for all macroblocks 382 uint64_t sse_count_; // pixel count for the sse_[] stats 383 int coded_size_; 384 int residual_bytes_[3][4]; 385 int block_count_[3]; 386 387 // quality/speed settings 388 int method_; // 0=fastest, 6=best/slowest. 389 VP8RDLevel rd_opt_level_; // Deduced from method_. 390 int max_i4_header_bits_; // partition #0 safeness factor 391 int mb_header_limit_; // rough limit for header bits per MB 392 int thread_level_; // derived from config->thread_level 393 int do_search_; // derived from config->target_XXX 394 int use_tokens_; // if true, use token buffer 395 396 // Memory 397 VP8MBInfo* mb_info_; // contextual macroblock infos (mb_w_ + 1) 398 uint8_t* preds_; // predictions modes: (4*mb_w+1) * (4*mb_h+1) 399 uint32_t* nz_; // non-zero bit context: mb_w+1 400 uint8_t* y_top_; // top luma samples. 401 uint8_t* uv_top_; // top u/v samples. 402 // U and V are packed into 16 bytes (8 U + 8 V) 403 LFStats* lf_stats_; // autofilter stats (if NULL, autofilter is off) 404 }; 405 406 //------------------------------------------------------------------------------ 407 // internal functions. Not public. 408 409 // in tree.c 410 extern const uint8_t VP8CoeffsProba0[NUM_TYPES][NUM_BANDS][NUM_CTX][NUM_PROBAS]; 411 extern const uint8_t 412 VP8CoeffsUpdateProba[NUM_TYPES][NUM_BANDS][NUM_CTX][NUM_PROBAS]; 413 // Reset the token probabilities to their initial (default) values 414 void VP8DefaultProbas(VP8Encoder* const enc); 415 // Write the token probabilities 416 void VP8WriteProbas(VP8BitWriter* const bw, const VP8EncProba* const probas); 417 // Writes the partition #0 modes (that is: all intra modes) 418 void VP8CodeIntraModes(VP8Encoder* const enc); 419 420 // in syntax.c 421 // Generates the final bitstream by coding the partition0 and headers, 422 // and appending an assembly of all the pre-coded token partitions. 423 // Return true if everything is ok. 424 int VP8EncWrite(VP8Encoder* const enc); 425 // Release memory allocated for bit-writing in VP8EncLoop & seq. 426 void VP8EncFreeBitWriters(VP8Encoder* const enc); 427 428 // in frame.c 429 extern const uint8_t VP8Cat3[]; 430 extern const uint8_t VP8Cat4[]; 431 extern const uint8_t VP8Cat5[]; 432 extern const uint8_t VP8Cat6[]; 433 434 // Form all the four Intra16x16 predictions in the yuv_p_ cache 435 void VP8MakeLuma16Preds(const VP8EncIterator* const it); 436 // Form all the four Chroma8x8 predictions in the yuv_p_ cache 437 void VP8MakeChroma8Preds(const VP8EncIterator* const it); 438 // Form all the ten Intra4x4 predictions in the yuv_p_ cache 439 // for the 4x4 block it->i4_ 440 void VP8MakeIntra4Preds(const VP8EncIterator* const it); 441 // Rate calculation 442 int VP8GetCostLuma16(VP8EncIterator* const it, const VP8ModeScore* const rd); 443 int VP8GetCostLuma4(VP8EncIterator* const it, const int16_t levels[16]); 444 int VP8GetCostUV(VP8EncIterator* const it, const VP8ModeScore* const rd); 445 // Main coding calls 446 int VP8EncLoop(VP8Encoder* const enc); 447 int VP8EncTokenLoop(VP8Encoder* const enc); 448 449 // in webpenc.c 450 // Assign an error code to a picture. Return false for convenience. 451 int WebPEncodingSetError(const WebPPicture* const pic, WebPEncodingError error); 452 int WebPReportProgress(const WebPPicture* const pic, 453 int percent, int* const percent_store); 454 455 // in analysis.c 456 // Main analysis loop. Decides the segmentations and complexity. 457 // Assigns a first guess for Intra16 and uvmode_ prediction modes. 458 int VP8EncAnalyze(VP8Encoder* const enc); 459 460 // in quant.c 461 // Sets up segment's quantization values, base_quant_ and filter strengths. 462 void VP8SetSegmentParams(VP8Encoder* const enc, float quality); 463 // Pick best modes and fills the levels. Returns true if skipped. 464 int VP8Decimate(VP8EncIterator* const it, VP8ModeScore* const rd, 465 VP8RDLevel rd_opt); 466 467 // in alpha.c 468 void VP8EncInitAlpha(VP8Encoder* const enc); // initialize alpha compression 469 int VP8EncStartAlpha(VP8Encoder* const enc); // start alpha coding process 470 int VP8EncFinishAlpha(VP8Encoder* const enc); // finalize compressed data 471 int VP8EncDeleteAlpha(VP8Encoder* const enc); // delete compressed data 472 473 // autofilter 474 void VP8InitFilter(VP8EncIterator* const it); 475 void VP8StoreFilterStats(VP8EncIterator* const it); 476 void VP8AdjustFilterStrength(VP8EncIterator* const it); 477 478 // returns the approximate filtering strength needed to smooth a edge 479 // step of 'delta', given a sharpness parameter 'sharpness'. 480 int VP8FilterStrengthFromDelta(int sharpness, int delta); 481 482 // misc utils for picture_*.c: 483 484 // Remove reference to the ARGB/YUVA buffer (doesn't free anything). 485 void WebPPictureResetBuffers(WebPPicture* const picture); 486 487 // Allocates ARGB buffer of given dimension (previous one is always free'd). 488 // Preserves the YUV(A) buffer. Returns false in case of error (invalid param, 489 // out-of-memory). 490 int WebPPictureAllocARGB(WebPPicture* const picture, int width, int height); 491 492 // Allocates YUVA buffer of given dimension (previous one is always free'd). 493 // Uses picture->csp to determine whether an alpha buffer is needed. 494 // Preserves the ARGB buffer. 495 // Returns false in case of error (invalid param, out-of-memory). 496 int WebPPictureAllocYUVA(WebPPicture* const picture, int width, int height); 497 498 // Clean-up the RGB samples under fully transparent area, to help lossless 499 // compressibility (no guarantee, though). Assumes that pic->use_argb is true. 500 void WebPCleanupTransparentAreaLossless(WebPPicture* const pic); 501 502 //------------------------------------------------------------------------------ 503 504 #ifdef __cplusplus 505 } // extern "C" 506 #endif 507 508 #endif /* WEBP_ENC_VP8I_ENC_H_ */ 509
