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@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 1 |
34 | #define ENC_MIN_VERSION 1 |
35 | #define ENC_REV_VERSION 0 |
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 | // quality below which error-diffusion is enabled |
124 | #define ERROR_DIFFUSION_QUALITY 98 |
125 | |
126 | //------------------------------------------------------------------------------ |
127 | // Headers |
128 | |
129 | typedef uint32_t proba_t; // 16b + 16b |
130 | typedef uint8_t ProbaArray[NUM_CTX][NUM_PROBAS]; |
131 | typedef proba_t StatsArray[NUM_CTX][NUM_PROBAS]; |
132 | typedef uint16_t CostArray[NUM_CTX][MAX_VARIABLE_LEVEL + 1]; |
133 | typedef const uint16_t* (*CostArrayPtr)[NUM_CTX]; // for easy casting |
134 | typedef const uint16_t* CostArrayMap[16][NUM_CTX]; |
135 | typedef double LFStats[NUM_MB_SEGMENTS][MAX_LF_LEVELS]; // filter stats |
136 | |
137 | typedef struct VP8Encoder VP8Encoder; |
138 | |
139 | // segment features |
140 | typedef struct { |
141 | int num_segments_; // Actual number of segments. 1 segment only = unused. |
142 | int update_map_; // whether to update the segment map or not. |
143 | // must be 0 if there's only 1 segment. |
144 | int size_; // bit-cost for transmitting the segment map |
145 | } ; |
146 | |
147 | // Struct collecting all frame-persistent probabilities. |
148 | typedef struct { |
149 | uint8_t segments_[3]; // probabilities for segment tree |
150 | uint8_t skip_proba_; // final probability of being skipped. |
151 | ProbaArray coeffs_[NUM_TYPES][NUM_BANDS]; // 1056 bytes |
152 | StatsArray stats_[NUM_TYPES][NUM_BANDS]; // 4224 bytes |
153 | CostArray level_cost_[NUM_TYPES][NUM_BANDS]; // 13056 bytes |
154 | CostArrayMap remapped_costs_[NUM_TYPES]; // 1536 bytes |
155 | int dirty_; // if true, need to call VP8CalculateLevelCosts() |
156 | int use_skip_proba_; // Note: we always use skip_proba for now. |
157 | int nb_skip_; // number of skipped blocks |
158 | } VP8EncProba; |
159 | |
160 | // Filter parameters. Not actually used in the code (we don't perform |
161 | // the in-loop filtering), but filled from user's config |
162 | typedef struct { |
163 | int simple_; // filtering type: 0=complex, 1=simple |
164 | int level_; // base filter level [0..63] |
165 | int sharpness_; // [0..7] |
166 | int i4x4_lf_delta_; // delta filter level for i4x4 relative to i16x16 |
167 | } ; |
168 | |
169 | //------------------------------------------------------------------------------ |
170 | // Informations about the macroblocks. |
171 | |
172 | typedef struct { |
173 | // block type |
174 | unsigned int type_:2; // 0=i4x4, 1=i16x16 |
175 | unsigned int uv_mode_:2; |
176 | unsigned int skip_:1; |
177 | unsigned int segment_:2; |
178 | uint8_t alpha_; // quantization-susceptibility |
179 | } VP8MBInfo; |
180 | |
181 | typedef struct VP8Matrix { |
182 | uint16_t q_[16]; // quantizer steps |
183 | uint16_t iq_[16]; // reciprocals, fixed point. |
184 | uint32_t bias_[16]; // rounding bias |
185 | uint32_t zthresh_[16]; // value below which a coefficient is zeroed |
186 | uint16_t sharpen_[16]; // frequency boosters for slight sharpening |
187 | } VP8Matrix; |
188 | |
189 | typedef struct { |
190 | VP8Matrix y1_, y2_, uv_; // quantization matrices |
191 | int alpha_; // quant-susceptibility, range [-127,127]. Zero is neutral. |
192 | // Lower values indicate a lower risk of blurriness. |
193 | int beta_; // filter-susceptibility, range [0,255]. |
194 | int quant_; // final segment quantizer. |
195 | int fstrength_; // final in-loop filtering strength |
196 | int max_edge_; // max edge delta (for filtering strength) |
197 | int min_disto_; // minimum distortion required to trigger filtering record |
198 | // reactivities |
199 | int lambda_i16_, lambda_i4_, lambda_uv_; |
200 | int lambda_mode_, lambda_trellis_, tlambda_; |
201 | int lambda_trellis_i16_, lambda_trellis_i4_, lambda_trellis_uv_; |
202 | |
203 | // lambda values for distortion-based evaluation |
204 | score_t i4_penalty_; // penalty for using Intra4 |
205 | } VP8SegmentInfo; |
206 | |
207 | typedef int8_t DError[2 /* u/v */][2 /* top or left */]; |
208 | |
209 | // Handy transient struct to accumulate score and info during RD-optimization |
210 | // and mode evaluation. |
211 | typedef struct { |
212 | score_t D, SD; // Distortion, spectral distortion |
213 | score_t H, R, score; // header bits, rate, score. |
214 | int16_t y_dc_levels[16]; // Quantized levels for luma-DC, luma-AC, chroma. |
215 | int16_t y_ac_levels[16][16]; |
216 | int16_t uv_levels[4 + 4][16]; |
217 | int mode_i16; // mode number for intra16 prediction |
218 | uint8_t modes_i4[16]; // mode numbers for intra4 predictions |
219 | int mode_uv; // mode number of chroma prediction |
220 | uint32_t nz; // non-zero blocks |
221 | int8_t derr[2][3]; // DC diffusion errors for U/V for blocks #1/2/3 |
222 | } VP8ModeScore; |
223 | |
224 | // Iterator structure to iterate through macroblocks, pointing to the |
225 | // right neighbouring data (samples, predictions, contexts, ...) |
226 | typedef struct { |
227 | int x_, y_; // current macroblock |
228 | uint8_t* yuv_in_; // input samples |
229 | uint8_t* yuv_out_; // output samples |
230 | uint8_t* yuv_out2_; // secondary buffer swapped with yuv_out_. |
231 | uint8_t* yuv_p_; // scratch buffer for prediction |
232 | VP8Encoder* enc_; // back-pointer |
233 | VP8MBInfo* mb_; // current macroblock |
234 | VP8BitWriter* bw_; // current bit-writer |
235 | uint8_t* preds_; // intra mode predictors (4x4 blocks) |
236 | uint32_t* nz_; // non-zero pattern |
237 | uint8_t i4_boundary_[37]; // 32+5 boundary samples needed by intra4x4 |
238 | uint8_t* i4_top_; // pointer to the current top boundary sample |
239 | int i4_; // current intra4x4 mode being tested |
240 | int top_nz_[9]; // top-non-zero context. |
241 | int left_nz_[9]; // left-non-zero. left_nz[8] is independent. |
242 | uint64_t bit_count_[4][3]; // bit counters for coded levels. |
243 | uint64_t luma_bits_; // macroblock bit-cost for luma |
244 | uint64_t uv_bits_; // macroblock bit-cost for chroma |
245 | LFStats* lf_stats_; // filter stats (borrowed from enc_) |
246 | int do_trellis_; // if true, perform extra level optimisation |
247 | int count_down_; // number of mb still to be processed |
248 | int count_down0_; // starting counter value (for progress) |
249 | int percent0_; // saved initial progress percent |
250 | |
251 | DError left_derr_; // left error diffusion (u/v) |
252 | DError* top_derr_; // top diffusion error - NULL if disabled |
253 | |
254 | uint8_t* y_left_; // left luma samples (addressable from index -1 to 15). |
255 | uint8_t* u_left_; // left u samples (addressable from index -1 to 7) |
256 | uint8_t* v_left_; // left v samples (addressable from index -1 to 7) |
257 | |
258 | uint8_t* y_top_; // top luma samples at position 'x_' |
259 | uint8_t* uv_top_; // top u/v samples at position 'x_', packed as 16 bytes |
260 | |
261 | // memory for storing y/u/v_left_ |
262 | uint8_t yuv_left_mem_[17 + 16 + 16 + 8 + WEBP_ALIGN_CST]; |
263 | // memory for yuv_* |
264 | uint8_t yuv_mem_[3 * YUV_SIZE_ENC + PRED_SIZE_ENC + WEBP_ALIGN_CST]; |
265 | } VP8EncIterator; |
266 | |
267 | // in iterator.c |
268 | // must be called first |
269 | void VP8IteratorInit(VP8Encoder* const enc, VP8EncIterator* const it); |
270 | // restart a scan |
271 | void VP8IteratorReset(VP8EncIterator* const it); |
272 | // reset iterator position to row 'y' |
273 | void VP8IteratorSetRow(VP8EncIterator* const it, int y); |
274 | // set count down (=number of iterations to go) |
275 | void VP8IteratorSetCountDown(VP8EncIterator* const it, int count_down); |
276 | // return true if iteration is finished |
277 | int VP8IteratorIsDone(const VP8EncIterator* const it); |
278 | // Import uncompressed samples from source. |
279 | // If tmp_32 is not NULL, import boundary samples too. |
280 | // tmp_32 is a 32-bytes scratch buffer that must be aligned in memory. |
281 | void VP8IteratorImport(VP8EncIterator* const it, uint8_t* const tmp_32); |
282 | // export decimated samples |
283 | void VP8IteratorExport(const VP8EncIterator* const it); |
284 | // go to next macroblock. Returns false if not finished. |
285 | int VP8IteratorNext(VP8EncIterator* const it); |
286 | // save the yuv_out_ boundary values to top_/left_ arrays for next iterations. |
287 | void VP8IteratorSaveBoundary(VP8EncIterator* const it); |
288 | // Report progression based on macroblock rows. Return 0 for user-abort request. |
289 | int VP8IteratorProgress(const VP8EncIterator* const it, |
290 | int final_delta_percent); |
291 | // Intra4x4 iterations |
292 | void VP8IteratorStartI4(VP8EncIterator* const it); |
293 | // returns true if not done. |
294 | int VP8IteratorRotateI4(VP8EncIterator* const it, |
295 | const uint8_t* const yuv_out); |
296 | |
297 | // Non-zero context setup/teardown |
298 | void VP8IteratorNzToBytes(VP8EncIterator* const it); |
299 | void VP8IteratorBytesToNz(VP8EncIterator* const it); |
300 | |
301 | // Helper functions to set mode properties |
302 | void VP8SetIntra16Mode(const VP8EncIterator* const it, int mode); |
303 | void VP8SetIntra4Mode(const VP8EncIterator* const it, const uint8_t* modes); |
304 | void VP8SetIntraUVMode(const VP8EncIterator* const it, int mode); |
305 | void VP8SetSkip(const VP8EncIterator* const it, int skip); |
306 | void VP8SetSegment(const VP8EncIterator* const it, int segment); |
307 | |
308 | //------------------------------------------------------------------------------ |
309 | // Paginated token buffer |
310 | |
311 | typedef struct VP8Tokens VP8Tokens; // struct details in token.c |
312 | |
313 | typedef struct { |
314 | #if !defined(DISABLE_TOKEN_BUFFER) |
315 | VP8Tokens* pages_; // first page |
316 | VP8Tokens** last_page_; // last page |
317 | uint16_t* tokens_; // set to (*last_page_)->tokens_ |
318 | int left_; // how many free tokens left before the page is full |
319 | int page_size_; // number of tokens per page |
320 | #endif |
321 | int error_; // true in case of malloc error |
322 | } VP8TBuffer; |
323 | |
324 | // initialize an empty buffer |
325 | void VP8TBufferInit(VP8TBuffer* const b, int page_size); |
326 | void VP8TBufferClear(VP8TBuffer* const b); // de-allocate pages memory |
327 | |
328 | #if !defined(DISABLE_TOKEN_BUFFER) |
329 | |
330 | // Finalizes bitstream when probabilities are known. |
331 | // Deletes the allocated token memory if final_pass is true. |
332 | int VP8EmitTokens(VP8TBuffer* const b, VP8BitWriter* const bw, |
333 | const uint8_t* const probas, int final_pass); |
334 | |
335 | // record the coding of coefficients without knowing the probabilities yet |
336 | int VP8RecordCoeffTokens(int ctx, const struct VP8Residual* const res, |
337 | VP8TBuffer* const tokens); |
338 | |
339 | // Estimate the final coded size given a set of 'probas'. |
340 | size_t VP8EstimateTokenSize(VP8TBuffer* const b, const uint8_t* const probas); |
341 | |
342 | #endif // !DISABLE_TOKEN_BUFFER |
343 | |
344 | //------------------------------------------------------------------------------ |
345 | // VP8Encoder |
346 | |
347 | struct VP8Encoder { |
348 | const WebPConfig* config_; // user configuration and parameters |
349 | WebPPicture* pic_; // input / output picture |
350 | |
351 | // headers |
352 | VP8EncFilterHeader filter_hdr_; // filtering information |
353 | VP8EncSegmentHeader segment_hdr_; // segment information |
354 | |
355 | int profile_; // VP8's profile, deduced from Config. |
356 | |
357 | // dimension, in macroblock units. |
358 | int mb_w_, mb_h_; |
359 | int preds_w_; // stride of the *preds_ prediction plane (=4*mb_w + 1) |
360 | |
361 | // number of partitions (1, 2, 4 or 8 = MAX_NUM_PARTITIONS) |
362 | int num_parts_; |
363 | |
364 | // per-partition boolean decoders. |
365 | VP8BitWriter bw_; // part0 |
366 | VP8BitWriter parts_[MAX_NUM_PARTITIONS]; // token partitions |
367 | VP8TBuffer tokens_; // token buffer |
368 | |
369 | int percent_; // for progress |
370 | |
371 | // transparency blob |
372 | int has_alpha_; |
373 | uint8_t* alpha_data_; // non-NULL if transparency is present |
374 | uint32_t alpha_data_size_; |
375 | WebPWorker alpha_worker_; |
376 | |
377 | // quantization info (one set of DC/AC dequant factor per segment) |
378 | VP8SegmentInfo dqm_[NUM_MB_SEGMENTS]; |
379 | int base_quant_; // nominal quantizer value. Only used |
380 | // for relative coding of segments' quant. |
381 | int alpha_; // global susceptibility (<=> complexity) |
382 | int uv_alpha_; // U/V quantization susceptibility |
383 | // global offset of quantizers, shared by all segments |
384 | int dq_y1_dc_; |
385 | int dq_y2_dc_, dq_y2_ac_; |
386 | int dq_uv_dc_, dq_uv_ac_; |
387 | |
388 | // probabilities and statistics |
389 | VP8EncProba proba_; |
390 | uint64_t sse_[4]; // sum of Y/U/V/A squared errors for all macroblocks |
391 | uint64_t sse_count_; // pixel count for the sse_[] stats |
392 | int coded_size_; |
393 | int residual_bytes_[3][4]; |
394 | int block_count_[3]; |
395 | |
396 | // quality/speed settings |
397 | int method_; // 0=fastest, 6=best/slowest. |
398 | VP8RDLevel rd_opt_level_; // Deduced from method_. |
399 | int ; // partition #0 safeness factor |
400 | int ; // rough limit for header bits per MB |
401 | int thread_level_; // derived from config->thread_level |
402 | int do_search_; // derived from config->target_XXX |
403 | int use_tokens_; // if true, use token buffer |
404 | |
405 | // Memory |
406 | VP8MBInfo* mb_info_; // contextual macroblock infos (mb_w_ + 1) |
407 | uint8_t* preds_; // predictions modes: (4*mb_w+1) * (4*mb_h+1) |
408 | uint32_t* nz_; // non-zero bit context: mb_w+1 |
409 | uint8_t* y_top_; // top luma samples. |
410 | uint8_t* uv_top_; // top u/v samples. |
411 | // U and V are packed into 16 bytes (8 U + 8 V) |
412 | LFStats* lf_stats_; // autofilter stats (if NULL, autofilter is off) |
413 | DError* top_derr_; // diffusion error (NULL if disabled) |
414 | }; |
415 | |
416 | //------------------------------------------------------------------------------ |
417 | // internal functions. Not public. |
418 | |
419 | // in tree.c |
420 | extern const uint8_t VP8CoeffsProba0[NUM_TYPES][NUM_BANDS][NUM_CTX][NUM_PROBAS]; |
421 | extern const uint8_t |
422 | VP8CoeffsUpdateProba[NUM_TYPES][NUM_BANDS][NUM_CTX][NUM_PROBAS]; |
423 | // Reset the token probabilities to their initial (default) values |
424 | void VP8DefaultProbas(VP8Encoder* const enc); |
425 | // Write the token probabilities |
426 | void VP8WriteProbas(VP8BitWriter* const bw, const VP8EncProba* const probas); |
427 | // Writes the partition #0 modes (that is: all intra modes) |
428 | void VP8CodeIntraModes(VP8Encoder* const enc); |
429 | |
430 | // in syntax.c |
431 | // Generates the final bitstream by coding the partition0 and headers, |
432 | // and appending an assembly of all the pre-coded token partitions. |
433 | // Return true if everything is ok. |
434 | int VP8EncWrite(VP8Encoder* const enc); |
435 | // Release memory allocated for bit-writing in VP8EncLoop & seq. |
436 | void VP8EncFreeBitWriters(VP8Encoder* const enc); |
437 | |
438 | // in frame.c |
439 | extern const uint8_t VP8Cat3[]; |
440 | extern const uint8_t VP8Cat4[]; |
441 | extern const uint8_t VP8Cat5[]; |
442 | extern const uint8_t VP8Cat6[]; |
443 | |
444 | // Form all the four Intra16x16 predictions in the yuv_p_ cache |
445 | void VP8MakeLuma16Preds(const VP8EncIterator* const it); |
446 | // Form all the four Chroma8x8 predictions in the yuv_p_ cache |
447 | void VP8MakeChroma8Preds(const VP8EncIterator* const it); |
448 | // Form all the ten Intra4x4 predictions in the yuv_p_ cache |
449 | // for the 4x4 block it->i4_ |
450 | void VP8MakeIntra4Preds(const VP8EncIterator* const it); |
451 | // Rate calculation |
452 | int VP8GetCostLuma16(VP8EncIterator* const it, const VP8ModeScore* const rd); |
453 | int VP8GetCostLuma4(VP8EncIterator* const it, const int16_t levels[16]); |
454 | int VP8GetCostUV(VP8EncIterator* const it, const VP8ModeScore* const rd); |
455 | // Main coding calls |
456 | int VP8EncLoop(VP8Encoder* const enc); |
457 | int VP8EncTokenLoop(VP8Encoder* const enc); |
458 | |
459 | // in webpenc.c |
460 | // Assign an error code to a picture. Return false for convenience. |
461 | int WebPEncodingSetError(const WebPPicture* const pic, WebPEncodingError error); |
462 | int WebPReportProgress(const WebPPicture* const pic, |
463 | int percent, int* const percent_store); |
464 | |
465 | // in analysis.c |
466 | // Main analysis loop. Decides the segmentations and complexity. |
467 | // Assigns a first guess for Intra16 and uvmode_ prediction modes. |
468 | int VP8EncAnalyze(VP8Encoder* const enc); |
469 | |
470 | // in quant.c |
471 | // Sets up segment's quantization values, base_quant_ and filter strengths. |
472 | void VP8SetSegmentParams(VP8Encoder* const enc, float quality); |
473 | // Pick best modes and fills the levels. Returns true if skipped. |
474 | int VP8Decimate(VP8EncIterator* const it, VP8ModeScore* const rd, |
475 | VP8RDLevel rd_opt); |
476 | |
477 | // in alpha.c |
478 | void VP8EncInitAlpha(VP8Encoder* const enc); // initialize alpha compression |
479 | int VP8EncStartAlpha(VP8Encoder* const enc); // start alpha coding process |
480 | int VP8EncFinishAlpha(VP8Encoder* const enc); // finalize compressed data |
481 | int VP8EncDeleteAlpha(VP8Encoder* const enc); // delete compressed data |
482 | |
483 | // autofilter |
484 | void VP8InitFilter(VP8EncIterator* const it); |
485 | void VP8StoreFilterStats(VP8EncIterator* const it); |
486 | void VP8AdjustFilterStrength(VP8EncIterator* const it); |
487 | |
488 | // returns the approximate filtering strength needed to smooth a edge |
489 | // step of 'delta', given a sharpness parameter 'sharpness'. |
490 | int VP8FilterStrengthFromDelta(int sharpness, int delta); |
491 | |
492 | // misc utils for picture_*.c: |
493 | |
494 | // Remove reference to the ARGB/YUVA buffer (doesn't free anything). |
495 | void WebPPictureResetBuffers(WebPPicture* const picture); |
496 | |
497 | // Allocates ARGB buffer of given dimension (previous one is always free'd). |
498 | // Preserves the YUV(A) buffer. Returns false in case of error (invalid param, |
499 | // out-of-memory). |
500 | int WebPPictureAllocARGB(WebPPicture* const picture, int width, int height); |
501 | |
502 | // Allocates YUVA buffer of given dimension (previous one is always free'd). |
503 | // Uses picture->csp to determine whether an alpha buffer is needed. |
504 | // Preserves the ARGB buffer. |
505 | // Returns false in case of error (invalid param, out-of-memory). |
506 | int WebPPictureAllocYUVA(WebPPicture* const picture, int width, int height); |
507 | |
508 | // Clean-up the RGB samples under fully transparent area, to help lossless |
509 | // compressibility (no guarantee, though). Assumes that pic->use_argb is true. |
510 | void WebPCleanupTransparentAreaLossless(WebPPicture* const pic); |
511 | |
512 | //------------------------------------------------------------------------------ |
513 | |
514 | #ifdef __cplusplus |
515 | } // extern "C" |
516 | #endif |
517 | |
518 | #endif // WEBP_ENC_VP8I_ENC_H_ |
519 | |