1 /* 2 * Copyright (c) 2010 The WebM project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 12 #include <math.h> 13 #include <stdio.h> 14 #include <string.h> 15 #include <assert.h> 16 #include "onyx_int.h" 17 #include "tokenize.h" 18 #include "vpx_mem/vpx_mem.h" 19 20 /* Global event counters used for accumulating statistics across several 21 compressions, then generating context.c = initial stats. */ 22 23 #ifdef ENTROPY_STATS 24 _int64 context_counters[BLOCK_TYPES] [COEF_BANDS] [PREV_COEF_CONTEXTS] [vp8_coef_tokens]; 25 #endif 26 void vp8_stuff_mb(VP8_COMP *cpi, MACROBLOCKD *x, TOKENEXTRA **t) ; 27 void vp8_fix_contexts(MACROBLOCKD *x); 28 29 TOKENVALUE vp8_dct_value_tokens[DCT_MAX_VALUE*2]; 30 const TOKENVALUE *vp8_dct_value_tokens_ptr; 31 int vp8_dct_value_cost[DCT_MAX_VALUE*2]; 32 const int *vp8_dct_value_cost_ptr; 33 #if 0 34 int skip_true_count = 0; 35 int skip_false_count = 0; 36 #endif 37 static void fill_value_tokens() 38 { 39 40 TOKENVALUE *const t = vp8_dct_value_tokens + DCT_MAX_VALUE; 41 vp8_extra_bit_struct *const e = vp8_extra_bits; 42 43 int i = -DCT_MAX_VALUE; 44 int sign = 1; 45 46 do 47 { 48 if (!i) 49 sign = 0; 50 51 { 52 const int a = sign ? -i : i; 53 int eb = sign; 54 55 if (a > 4) 56 { 57 int j = 4; 58 59 while (++j < 11 && e[j].base_val <= a) {} 60 61 t[i].Token = --j; 62 eb |= (a - e[j].base_val) << 1; 63 } 64 else 65 t[i].Token = a; 66 67 t[i].Extra = eb; 68 } 69 70 // initialize the cost for extra bits for all possible coefficient value. 71 { 72 int cost = 0; 73 vp8_extra_bit_struct *p = vp8_extra_bits + t[i].Token; 74 75 if (p->base_val) 76 { 77 const int extra = t[i].Extra; 78 const int Length = p->Len; 79 80 if (Length) 81 cost += vp8_treed_cost(p->tree, p->prob, extra >> 1, Length); 82 83 cost += vp8_cost_bit(vp8_prob_half, extra & 1); /* sign */ 84 vp8_dct_value_cost[i + DCT_MAX_VALUE] = cost; 85 } 86 87 } 88 89 } 90 while (++i < DCT_MAX_VALUE); 91 92 vp8_dct_value_tokens_ptr = vp8_dct_value_tokens + DCT_MAX_VALUE; 93 vp8_dct_value_cost_ptr = vp8_dct_value_cost + DCT_MAX_VALUE; 94 } 95 96 static void tokenize2nd_order_b 97 ( 98 const BLOCKD *const b, 99 TOKENEXTRA **tp, 100 const int type, /* which plane: 0=Y no DC, 1=Y2, 2=UV, 3=Y with DC */ 101 const FRAME_TYPE frametype, 102 ENTROPY_CONTEXT *a, 103 ENTROPY_CONTEXT *l, 104 VP8_COMP *cpi 105 ) 106 { 107 int pt; /* near block/prev token context index */ 108 int c = 0; /* start at DC */ 109 const int eob = b->eob; /* one beyond last nonzero coeff */ 110 TOKENEXTRA *t = *tp; /* store tokens starting here */ 111 int x; 112 const short *qcoeff_ptr = b->qcoeff; 113 VP8_COMBINEENTROPYCONTEXTS(pt, *a, *l); 114 115 do 116 { 117 const int band = vp8_coef_bands[c]; 118 119 if (c < eob) 120 { 121 int rc = vp8_default_zig_zag1d[c]; 122 const int v = qcoeff_ptr[rc]; 123 124 assert(-DCT_MAX_VALUE <= v && v < (DCT_MAX_VALUE)); 125 126 t->Extra = vp8_dct_value_tokens_ptr[v].Extra; 127 x = vp8_dct_value_tokens_ptr[v].Token; 128 } 129 else 130 x = DCT_EOB_TOKEN; 131 132 t->Token = x; 133 t->context_tree = cpi->common.fc.coef_probs [type] [band] [pt]; 134 135 t->section = frametype * BLOCK_TYPES * 2 + 2 * type + (c == 0); 136 137 t->skip_eob_node = pt == 0 && ((band > 0 && type > 0) || (band > 1 && type == 0)); 138 139 ++cpi->coef_counts [type] [band] [pt] [x]; 140 } 141 while (pt = vp8_prev_token_class[x], ++t, c < eob && ++c < 16); 142 143 *tp = t; 144 pt = (c != !type); /* 0 <-> all coeff data is zero */ 145 *a = *l = pt; 146 147 } 148 149 static void tokenize1st_order_b 150 ( 151 const BLOCKD *const b, 152 TOKENEXTRA **tp, 153 const int type, /* which plane: 0=Y no DC, 1=Y2, 2=UV, 3=Y with DC */ 154 const FRAME_TYPE frametype, 155 ENTROPY_CONTEXT *a, 156 ENTROPY_CONTEXT *l, 157 VP8_COMP *cpi 158 ) 159 { 160 int pt; /* near block/prev token context index */ 161 int c = type ? 0 : 1; /* start at DC unless type 0 */ 162 const int eob = b->eob; /* one beyond last nonzero coeff */ 163 TOKENEXTRA *t = *tp; /* store tokens starting here */ 164 int x; 165 const short *qcoeff_ptr = b->qcoeff; 166 VP8_COMBINEENTROPYCONTEXTS(pt, *a, *l); 167 168 do 169 { 170 const int band = vp8_coef_bands[c]; 171 172 x = DCT_EOB_TOKEN; 173 174 if (c < eob) 175 { 176 int rc = vp8_default_zig_zag1d[c]; 177 const int v = qcoeff_ptr[rc]; 178 179 assert(-DCT_MAX_VALUE <= v && v < (DCT_MAX_VALUE)); 180 181 t->Extra = vp8_dct_value_tokens_ptr[v].Extra; 182 x = vp8_dct_value_tokens_ptr[v].Token; 183 } 184 185 t->Token = x; 186 t->context_tree = cpi->common.fc.coef_probs [type] [band] [pt]; 187 188 t->section = frametype * BLOCK_TYPES * 2 + 2 * type + (c == 0); 189 t->skip_eob_node = pt == 0 && ((band > 0 && type > 0) || (band > 1 && type == 0)); 190 191 ++cpi->coef_counts [type] [band] [pt] [x]; 192 } 193 while (pt = vp8_prev_token_class[x], ++t, c < eob && ++c < 16); 194 195 *tp = t; 196 pt = (c != !type); /* 0 <-> all coeff data is zero */ 197 *a = *l = pt; 198 199 } 200 201 202 static int mb_is_skippable(MACROBLOCKD *x) 203 { 204 int has_y2_block; 205 int skip = 1; 206 int i = 0; 207 208 has_y2_block = (x->mode_info_context->mbmi.mode != B_PRED 209 && x->mode_info_context->mbmi.mode != SPLITMV); 210 if (has_y2_block) 211 { 212 for (i = 0; i < 16; i++) 213 skip &= (x->block[i].eob < 2); 214 } 215 216 for (; i < 24 + has_y2_block; i++) 217 skip &= (!x->block[i].eob); 218 219 return skip; 220 } 221 222 223 void vp8_tokenize_mb(VP8_COMP *cpi, MACROBLOCKD *x, TOKENEXTRA **t) 224 { 225 ENTROPY_CONTEXT * A = (ENTROPY_CONTEXT *)x->above_context; 226 ENTROPY_CONTEXT * L = (ENTROPY_CONTEXT *)x->left_context; 227 int plane_type; 228 int b; 229 230 TOKENEXTRA *start = *t; 231 TOKENEXTRA *tp = *t; 232 233 x->mode_info_context->mbmi.dc_diff = 1; 234 235 #if 0 236 237 if (x->mbmi.force_no_skip) 238 { 239 x->mbmi.mb_skip_coeff = 1; 240 //reset for next_mb. 241 x->mbmi.force_no_skip = 0; 242 } 243 244 #endif 245 246 #if 1 247 248 x->mode_info_context->mbmi.mb_skip_coeff = mb_is_skippable(x); 249 if (x->mode_info_context->mbmi.mb_skip_coeff) 250 { 251 252 cpi->skip_true_count++; 253 254 if (!cpi->common.mb_no_coeff_skip) 255 vp8_stuff_mb(cpi, x, t) ; 256 else 257 { 258 vp8_fix_contexts(x); 259 } 260 261 if (x->mode_info_context->mbmi.mode != B_PRED && x->mode_info_context->mbmi.mode != SPLITMV) 262 x->mode_info_context->mbmi.dc_diff = 0; 263 else 264 x->mode_info_context->mbmi.dc_diff = 1; 265 266 267 return; 268 } 269 270 cpi->skip_false_count++; 271 #endif 272 #if 0 273 vpx_memcpy(cpi->coef_counts_backup, cpi->coef_counts, sizeof(cpi->coef_counts)); 274 #endif 275 276 if (x->mode_info_context->mbmi.mode == B_PRED || x->mode_info_context->mbmi.mode == SPLITMV) 277 { 278 plane_type = 3; 279 } 280 else 281 { 282 tokenize2nd_order_b(x->block + 24, t, 1, x->frame_type, 283 A + vp8_block2above[24], L + vp8_block2left[24], cpi); 284 plane_type = 0; 285 286 } 287 288 for (b = 0; b < 16; b++) 289 tokenize1st_order_b(x->block + b, t, plane_type, x->frame_type, 290 A + vp8_block2above[b], 291 L + vp8_block2left[b], cpi); 292 293 for (b = 16; b < 24; b++) 294 tokenize1st_order_b(x->block + b, t, 2, x->frame_type, 295 A + vp8_block2above[b], 296 L + vp8_block2left[b], cpi); 297 298 #if 0 299 300 if (cpi->common.mb_no_coeff_skip) 301 { 302 int skip = 1; 303 304 while ((tp != *t) && skip) 305 { 306 skip = (skip && (tp->Token == DCT_EOB_TOKEN)); 307 tp ++; 308 } 309 310 if (skip != x->mbmi.mb_skip_coeff) 311 skip += 0; 312 313 x->mbmi.mb_skip_coeff = skip; 314 315 if (x->mbmi.mb_skip_coeff == 1) 316 { 317 x->mbmi.dc_diff = 0; 318 //redo the coutnts 319 vpx_memcpy(cpi->coef_counts, cpi->coef_counts_backup, sizeof(cpi->coef_counts)); 320 321 *t = start; 322 cpi->skip_true_count++; 323 //skip_true_count++; 324 } 325 else 326 { 327 328 cpi->skip_false_count++; 329 //skip_false_count++; 330 } 331 } 332 333 #endif 334 } 335 336 337 #ifdef ENTROPY_STATS 338 339 void init_context_counters(void) 340 { 341 vpx_memset(context_counters, 0, sizeof(context_counters)); 342 } 343 344 void print_context_counters() 345 { 346 347 int type, band, pt, t; 348 349 FILE *const f = fopen("context.c", "w"); 350 351 fprintf(f, "#include \"entropy.h\"\n"); 352 353 fprintf(f, "\n/* *** GENERATED FILE: DO NOT EDIT *** */\n\n"); 354 355 fprintf(f, "int Contexts[BLOCK_TYPES] [COEF_BANDS] [PREV_COEF_CONTEXTS] [vp8_coef_tokens];\n\n"); 356 357 fprintf(f, "const int default_contexts[BLOCK_TYPES] [COEF_BANDS] [PREV_COEF_CONTEXTS] [vp8_coef_tokens] = {"); 358 359 # define Comma( X) (X? ",":"") 360 361 type = 0; 362 363 do 364 { 365 fprintf(f, "%s\n { /* block Type %d */", Comma(type), type); 366 367 band = 0; 368 369 do 370 { 371 fprintf(f, "%s\n { /* Coeff Band %d */", Comma(band), band); 372 373 pt = 0; 374 375 do 376 { 377 fprintf(f, "%s\n {", Comma(pt)); 378 379 t = 0; 380 381 do 382 { 383 const _int64 x = context_counters [type] [band] [pt] [t]; 384 const int y = (int) x; 385 386 assert(x == (_int64) y); /* no overflow handling yet */ 387 fprintf(f, "%s %d", Comma(t), y); 388 389 } 390 while (++t < vp8_coef_tokens); 391 392 fprintf(f, "}"); 393 } 394 while (++pt < PREV_COEF_CONTEXTS); 395 396 fprintf(f, "\n }"); 397 398 } 399 while (++band < COEF_BANDS); 400 401 fprintf(f, "\n }"); 402 } 403 while (++type < BLOCK_TYPES); 404 405 fprintf(f, "\n};\n"); 406 fclose(f); 407 } 408 #endif 409 410 411 void vp8_tokenize_initialize() 412 { 413 fill_value_tokens(); 414 } 415 416 417 static __inline void stuff2nd_order_b 418 ( 419 const BLOCKD *const b, 420 TOKENEXTRA **tp, 421 const int type, /* which plane: 0=Y no DC, 1=Y2, 2=UV, 3=Y with DC */ 422 const FRAME_TYPE frametype, 423 ENTROPY_CONTEXT *a, 424 ENTROPY_CONTEXT *l, 425 VP8_COMP *cpi 426 ) 427 { 428 int pt; /* near block/prev token context index */ 429 TOKENEXTRA *t = *tp; /* store tokens starting here */ 430 VP8_COMBINEENTROPYCONTEXTS(pt, *a, *l); 431 (void) frametype; 432 (void) type; 433 (void) b; 434 435 t->Token = DCT_EOB_TOKEN; 436 t->context_tree = cpi->common.fc.coef_probs [1] [0] [pt]; 437 t->section = 11; 438 t->skip_eob_node = 0; 439 ++cpi->coef_counts [1] [0] [pt] [DCT_EOB_TOKEN]; 440 ++t; 441 442 *tp = t; 443 pt = 0; 444 *a = *l = pt; 445 446 } 447 448 static __inline void stuff1st_order_b 449 ( 450 const BLOCKD *const b, 451 TOKENEXTRA **tp, 452 const int type, /* which plane: 0=Y no DC, 1=Y2, 2=UV, 3=Y with DC */ 453 const FRAME_TYPE frametype, 454 ENTROPY_CONTEXT *a, 455 ENTROPY_CONTEXT *l, 456 VP8_COMP *cpi 457 ) 458 { 459 int pt; /* near block/prev token context index */ 460 TOKENEXTRA *t = *tp; /* store tokens starting here */ 461 VP8_COMBINEENTROPYCONTEXTS(pt, *a, *l); 462 (void) frametype; 463 (void) type; 464 (void) b; 465 466 t->Token = DCT_EOB_TOKEN; 467 t->context_tree = cpi->common.fc.coef_probs [0] [1] [pt]; 468 t->section = 8; 469 t->skip_eob_node = 0; 470 ++cpi->coef_counts [0] [1] [pt] [DCT_EOB_TOKEN]; 471 ++t; 472 *tp = t; 473 pt = 0; /* 0 <-> all coeff data is zero */ 474 *a = *l = pt; 475 476 } 477 static __inline 478 void stuff1st_order_buv 479 ( 480 const BLOCKD *const b, 481 TOKENEXTRA **tp, 482 const int type, /* which plane: 0=Y no DC, 1=Y2, 2=UV, 3=Y with DC */ 483 const FRAME_TYPE frametype, 484 ENTROPY_CONTEXT *a, 485 ENTROPY_CONTEXT *l, 486 VP8_COMP *cpi 487 ) 488 { 489 int pt; /* near block/prev token context index */ 490 TOKENEXTRA *t = *tp; /* store tokens starting here */ 491 VP8_COMBINEENTROPYCONTEXTS(pt, *a, *l); 492 (void) frametype; 493 (void) type; 494 (void) b; 495 496 t->Token = DCT_EOB_TOKEN; 497 t->context_tree = cpi->common.fc.coef_probs [2] [0] [pt]; 498 t->section = 13; 499 t->skip_eob_node = 0; 500 ++cpi->coef_counts[2] [0] [pt] [DCT_EOB_TOKEN]; 501 ++t; 502 *tp = t; 503 pt = 0; /* 0 <-> all coeff data is zero */ 504 *a = *l = pt; 505 506 } 507 508 void vp8_stuff_mb(VP8_COMP *cpi, MACROBLOCKD *x, TOKENEXTRA **t) 509 { 510 ENTROPY_CONTEXT * A = (ENTROPY_CONTEXT *)x->above_context; 511 ENTROPY_CONTEXT * L = (ENTROPY_CONTEXT *)x->left_context; 512 int plane_type; 513 int b; 514 515 stuff2nd_order_b(x->block + 24, t, 1, x->frame_type, 516 A + vp8_block2above[24], L + vp8_block2left[24], cpi); 517 plane_type = 0; 518 519 520 if (x->mode_info_context->mbmi.mode != B_PRED && x->mode_info_context->mbmi.mode != SPLITMV) 521 x->mode_info_context->mbmi.dc_diff = 0; 522 else 523 x->mode_info_context->mbmi.dc_diff = 1; 524 525 526 for (b = 0; b < 16; b++) 527 stuff1st_order_b(x->block + b, t, plane_type, x->frame_type, 528 A + vp8_block2above[b], 529 L + vp8_block2left[b], cpi); 530 531 for (b = 16; b < 24; b++) 532 stuff1st_order_buv(x->block + b, t, 2, x->frame_type, 533 A + vp8_block2above[b], 534 L + vp8_block2left[b], cpi); 535 536 } 537 void vp8_fix_contexts(MACROBLOCKD *x) 538 { 539 /* Clear entropy contexts for Y2 blocks */ 540 if (x->mode_info_context->mbmi.mode != B_PRED && x->mode_info_context->mbmi.mode != SPLITMV) 541 { 542 vpx_memset(x->above_context, 0, sizeof(ENTROPY_CONTEXT_PLANES)); 543 vpx_memset(x->left_context, 0, sizeof(ENTROPY_CONTEXT_PLANES)); 544 } 545 else 546 { 547 vpx_memset(x->above_context, 0, sizeof(ENTROPY_CONTEXT_PLANES)-1); 548 vpx_memset(x->left_context, 0, sizeof(ENTROPY_CONTEXT_PLANES)-1); 549 } 550 551 } 552
