1/* 2 * RV40 decoder 3 * Copyright (c) 2007 Konstantin Shishkov 4 * 5 * This file is part of FFmpeg. 6 * 7 * FFmpeg is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2.1 of the License, or (at your option) any later version. 11 * 12 * FFmpeg is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with FFmpeg; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20 */ 21 22/** 23 * @file 24 * RV40 decoder 25 */ 26 27#include "avcodec.h" 28#include "dsputil.h" 29#include "mpegvideo.h" 30#include "golomb.h" 31 32#include "rv34.h" 33#include "rv40vlc2.h" 34#include "rv40data.h" 35 36static VLC aic_top_vlc; 37static VLC aic_mode1_vlc[AIC_MODE1_NUM], aic_mode2_vlc[AIC_MODE2_NUM]; 38static VLC ptype_vlc[NUM_PTYPE_VLCS], btype_vlc[NUM_BTYPE_VLCS]; 39 40static const int16_t mode2_offs[] = { 41 0, 614, 1222, 1794, 2410, 3014, 3586, 4202, 4792, 5382, 5966, 6542, 42 7138, 7716, 8292, 8864, 9444, 10030, 10642, 11212, 11814 43}; 44 45/** 46 * Initialize all tables. 47 */ 48static av_cold void rv40_init_tables(void) 49{ 50 int i; 51 static VLC_TYPE aic_table[1 << AIC_TOP_BITS][2]; 52 static VLC_TYPE aic_mode1_table[AIC_MODE1_NUM << AIC_MODE1_BITS][2]; 53 static VLC_TYPE aic_mode2_table[11814][2]; 54 static VLC_TYPE ptype_table[NUM_PTYPE_VLCS << PTYPE_VLC_BITS][2]; 55 static VLC_TYPE btype_table[NUM_BTYPE_VLCS << BTYPE_VLC_BITS][2]; 56 57 aic_top_vlc.table = aic_table; 58 aic_top_vlc.table_allocated = 1 << AIC_TOP_BITS; 59 init_vlc(&aic_top_vlc, AIC_TOP_BITS, AIC_TOP_SIZE, 60 rv40_aic_top_vlc_bits, 1, 1, 61 rv40_aic_top_vlc_codes, 1, 1, INIT_VLC_USE_NEW_STATIC); 62 for(i = 0; i < AIC_MODE1_NUM; i++){ 63 // Every tenth VLC table is empty 64 if((i % 10) == 9) continue; 65 aic_mode1_vlc[i].table = &aic_mode1_table[i << AIC_MODE1_BITS]; 66 aic_mode1_vlc[i].table_allocated = 1 << AIC_MODE1_BITS; 67 init_vlc(&aic_mode1_vlc[i], AIC_MODE1_BITS, AIC_MODE1_SIZE, 68 aic_mode1_vlc_bits[i], 1, 1, 69 aic_mode1_vlc_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC); 70 } 71 for(i = 0; i < AIC_MODE2_NUM; i++){ 72 aic_mode2_vlc[i].table = &aic_mode2_table[mode2_offs[i]]; 73 aic_mode2_vlc[i].table_allocated = mode2_offs[i + 1] - mode2_offs[i]; 74 init_vlc(&aic_mode2_vlc[i], AIC_MODE2_BITS, AIC_MODE2_SIZE, 75 aic_mode2_vlc_bits[i], 1, 1, 76 aic_mode2_vlc_codes[i], 2, 2, INIT_VLC_USE_NEW_STATIC); 77 } 78 for(i = 0; i < NUM_PTYPE_VLCS; i++){ 79 ptype_vlc[i].table = &ptype_table[i << PTYPE_VLC_BITS]; 80 ptype_vlc[i].table_allocated = 1 << PTYPE_VLC_BITS; 81 init_vlc_sparse(&ptype_vlc[i], PTYPE_VLC_BITS, PTYPE_VLC_SIZE, 82 ptype_vlc_bits[i], 1, 1, 83 ptype_vlc_codes[i], 1, 1, 84 ptype_vlc_syms, 1, 1, INIT_VLC_USE_NEW_STATIC); 85 } 86 for(i = 0; i < NUM_BTYPE_VLCS; i++){ 87 btype_vlc[i].table = &btype_table[i << BTYPE_VLC_BITS]; 88 btype_vlc[i].table_allocated = 1 << BTYPE_VLC_BITS; 89 init_vlc_sparse(&btype_vlc[i], BTYPE_VLC_BITS, BTYPE_VLC_SIZE, 90 btype_vlc_bits[i], 1, 1, 91 btype_vlc_codes[i], 1, 1, 92 btype_vlc_syms, 1, 1, INIT_VLC_USE_NEW_STATIC); 93 } 94} 95 96/** 97 * Get stored dimension from bitstream. 98 * 99 * If the width/height is the standard one then it's coded as a 3-bit index. 100 * Otherwise it is coded as escaped 8-bit portions. 101 */ 102static int get_dimension(GetBitContext *gb, const int *dim) 103{ 104 int t = get_bits(gb, 3); 105 int val = dim[t]; 106 if(val < 0) 107 val = dim[get_bits1(gb) - val]; 108 if(!val){ 109 do{ 110 t = get_bits(gb, 8); 111 val += t << 2; 112 }while(t == 0xFF); 113 } 114 return val; 115} 116 117/** 118 * Get encoded picture size - usually this is called from rv40_parse_slice_header. 119 */ 120static void rv40_parse_picture_size(GetBitContext *gb, int *w, int *h) 121{ 122 *w = get_dimension(gb, rv40_standard_widths); 123 *h = get_dimension(gb, rv40_standard_heights); 124} 125 126static int rv40_parse_slice_header(RV34DecContext *r, GetBitContext *gb, SliceInfo *si) 127{ 128 int mb_bits; 129 int w = r->s.width, h = r->s.height; 130 int mb_size; 131 132 memset(si, 0, sizeof(SliceInfo)); 133 if(get_bits1(gb)) 134 return -1; 135 si->type = get_bits(gb, 2); 136 if(si->type == 1) si->type = 0; 137 si->quant = get_bits(gb, 5); 138 if(get_bits(gb, 2)) 139 return -1; 140 si->vlc_set = get_bits(gb, 2); 141 skip_bits1(gb); 142 si->pts = get_bits(gb, 13); 143 if(!si->type || !get_bits1(gb)) 144 rv40_parse_picture_size(gb, &w, &h); 145 if(avcodec_check_dimensions(r->s.avctx, w, h) < 0) 146 return -1; 147 si->width = w; 148 si->height = h; 149 mb_size = ((w + 15) >> 4) * ((h + 15) >> 4); 150 mb_bits = ff_rv34_get_start_offset(gb, mb_size); 151 si->start = get_bits(gb, mb_bits); 152 153 return 0; 154} 155 156/** 157 * Decode 4x4 intra types array. 158 */ 159static int rv40_decode_intra_types(RV34DecContext *r, GetBitContext *gb, int8_t *dst) 160{ 161 MpegEncContext *s = &r->s; 162 int i, j, k, v; 163 int A, B, C; 164 int pattern; 165 int8_t *ptr; 166 167 for(i = 0; i < 4; i++, dst += r->intra_types_stride){ 168 if(!i && s->first_slice_line){ 169 pattern = get_vlc2(gb, aic_top_vlc.table, AIC_TOP_BITS, 1); 170 dst[0] = (pattern >> 2) & 2; 171 dst[1] = (pattern >> 1) & 2; 172 dst[2] = pattern & 2; 173 dst[3] = (pattern << 1) & 2; 174 continue; 175 } 176 ptr = dst; 177 for(j = 0; j < 4; j++){ 178 /* Coefficients are read using VLC chosen by the prediction pattern 179 * The first one (used for retrieving a pair of coefficients) is 180 * constructed from the top, top right and left coefficients 181 * The second one (used for retrieving only one coefficient) is 182 * top + 10 * left. 183 */ 184 A = ptr[-r->intra_types_stride + 1]; // it won't be used for the last coefficient in a row 185 B = ptr[-r->intra_types_stride]; 186 C = ptr[-1]; 187 pattern = A + (B << 4) + (C << 8); 188 for(k = 0; k < MODE2_PATTERNS_NUM; k++) 189 if(pattern == rv40_aic_table_index[k]) 190 break; 191 if(j < 3 && k < MODE2_PATTERNS_NUM){ //pattern is found, decoding 2 coefficients 192 v = get_vlc2(gb, aic_mode2_vlc[k].table, AIC_MODE2_BITS, 2); 193 *ptr++ = v/9; 194 *ptr++ = v%9; 195 j++; 196 }else{ 197 if(B != -1 && C != -1) 198 v = get_vlc2(gb, aic_mode1_vlc[B + C*10].table, AIC_MODE1_BITS, 1); 199 else{ // tricky decoding 200 v = 0; 201 switch(C){ 202 case -1: // code 0 -> 1, 1 -> 0 203 if(B < 2) 204 v = get_bits1(gb) ^ 1; 205 break; 206 case 0: 207 case 2: // code 0 -> 2, 1 -> 0 208 v = (get_bits1(gb) ^ 1) << 1; 209 break; 210 } 211 } 212 *ptr++ = v; 213 } 214 } 215 } 216 return 0; 217} 218 219/** 220 * Decode macroblock information. 221 */ 222static int rv40_decode_mb_info(RV34DecContext *r) 223{ 224 MpegEncContext *s = &r->s; 225 GetBitContext *gb = &s->gb; 226 int q, i; 227 int prev_type = 0; 228 int mb_pos = s->mb_x + s->mb_y * s->mb_stride; 229 int blocks[RV34_MB_TYPES] = {0}; 230 int count = 0; 231 232 if(!r->s.mb_skip_run) 233 r->s.mb_skip_run = svq3_get_ue_golomb(gb) + 1; 234 235 if(--r->s.mb_skip_run) 236 return RV34_MB_SKIP; 237 238 if(r->avail_cache[6-1]) 239 blocks[r->mb_type[mb_pos - 1]]++; 240 if(r->avail_cache[6-4]){ 241 blocks[r->mb_type[mb_pos - s->mb_stride]]++; 242 if(r->avail_cache[6-2]) 243 blocks[r->mb_type[mb_pos - s->mb_stride + 1]]++; 244 if(r->avail_cache[6-5]) 245 blocks[r->mb_type[mb_pos - s->mb_stride - 1]]++; 246 } 247 248 for(i = 0; i < RV34_MB_TYPES; i++){ 249 if(blocks[i] > count){ 250 count = blocks[i]; 251 prev_type = i; 252 } 253 } 254 if(s->pict_type == FF_P_TYPE){ 255 prev_type = block_num_to_ptype_vlc_num[prev_type]; 256 q = get_vlc2(gb, ptype_vlc[prev_type].table, PTYPE_VLC_BITS, 1); 257 if(q < PBTYPE_ESCAPE) 258 return q; 259 q = get_vlc2(gb, ptype_vlc[prev_type].table, PTYPE_VLC_BITS, 1); 260 av_log(s->avctx, AV_LOG_ERROR, "Dquant for P-frame\n"); 261 }else{ 262 prev_type = block_num_to_btype_vlc_num[prev_type]; 263 q = get_vlc2(gb, btype_vlc[prev_type].table, BTYPE_VLC_BITS, 1); 264 if(q < PBTYPE_ESCAPE) 265 return q; 266 q = get_vlc2(gb, btype_vlc[prev_type].table, BTYPE_VLC_BITS, 1); 267 av_log(s->avctx, AV_LOG_ERROR, "Dquant for B-frame\n"); 268 } 269 return 0; 270} 271 272#define CLIP_SYMM(a, b) av_clip(a, -(b), b) 273/** 274 * weaker deblocking very similar to the one described in 4.4.2 of JVT-A003r1 275 */ 276static inline void rv40_weak_loop_filter(uint8_t *src, const int step, 277 const int filter_p1, const int filter_q1, 278 const int alpha, const int beta, 279 const int lim_p0q0, 280 const int lim_q1, const int lim_p1, 281 const int diff_p1p0, const int diff_q1q0, 282 const int diff_p1p2, const int diff_q1q2) 283{ 284 uint8_t *cm = ff_cropTbl + MAX_NEG_CROP; 285 int t, u, diff; 286 287 t = src[0*step] - src[-1*step]; 288 if(!t) 289 return; 290 u = (alpha * FFABS(t)) >> 7; 291 if(u > 3 - (filter_p1 && filter_q1)) 292 return; 293 294 t <<= 2; 295 if(filter_p1 && filter_q1) 296 t += src[-2*step] - src[1*step]; 297 diff = CLIP_SYMM((t + 4) >> 3, lim_p0q0); 298 src[-1*step] = cm[src[-1*step] + diff]; 299 src[ 0*step] = cm[src[ 0*step] - diff]; 300 if(FFABS(diff_p1p2) <= beta && filter_p1){ 301 t = (diff_p1p0 + diff_p1p2 - diff) >> 1; 302 src[-2*step] = cm[src[-2*step] - CLIP_SYMM(t, lim_p1)]; 303 } 304 if(FFABS(diff_q1q2) <= beta && filter_q1){ 305 t = (diff_q1q0 + diff_q1q2 + diff) >> 1; 306 src[ 1*step] = cm[src[ 1*step] - CLIP_SYMM(t, lim_q1)]; 307 } 308} 309 310static inline void rv40_adaptive_loop_filter(uint8_t *src, const int step, 311 const int stride, const int dmode, 312 const int lim_q1, const int lim_p1, 313 const int alpha, 314 const int beta, const int beta2, 315 const int chroma, const int edge) 316{ 317 int diff_p1p0[4], diff_q1q0[4], diff_p1p2[4], diff_q1q2[4]; 318 int sum_p1p0 = 0, sum_q1q0 = 0, sum_p1p2 = 0, sum_q1q2 = 0; 319 uint8_t *ptr; 320 int flag_strong0 = 1, flag_strong1 = 1; 321 int filter_p1, filter_q1; 322 int i; 323 int lims; 324 325 for(i = 0, ptr = src; i < 4; i++, ptr += stride){ 326 diff_p1p0[i] = ptr[-2*step] - ptr[-1*step]; 327 diff_q1q0[i] = ptr[ 1*step] - ptr[ 0*step]; 328 sum_p1p0 += diff_p1p0[i]; 329 sum_q1q0 += diff_q1q0[i]; 330 } 331 filter_p1 = FFABS(sum_p1p0) < (beta<<2); 332 filter_q1 = FFABS(sum_q1q0) < (beta<<2); 333 if(!filter_p1 && !filter_q1) 334 return; 335 336 for(i = 0, ptr = src; i < 4; i++, ptr += stride){ 337 diff_p1p2[i] = ptr[-2*step] - ptr[-3*step]; 338 diff_q1q2[i] = ptr[ 1*step] - ptr[ 2*step]; 339 sum_p1p2 += diff_p1p2[i]; 340 sum_q1q2 += diff_q1q2[i]; 341 } 342 343 if(edge){ 344 flag_strong0 = filter_p1 && (FFABS(sum_p1p2) < beta2); 345 flag_strong1 = filter_q1 && (FFABS(sum_q1q2) < beta2); 346 }else{ 347 flag_strong0 = flag_strong1 = 0; 348 } 349 350 lims = filter_p1 + filter_q1 + ((lim_q1 + lim_p1) >> 1) + 1; 351 if(flag_strong0 && flag_strong1){ /* strong filtering */ 352 for(i = 0; i < 4; i++, src += stride){ 353 int sflag, p0, q0, p1, q1; 354 int t = src[0*step] - src[-1*step]; 355 356 if(!t) continue; 357 sflag = (alpha * FFABS(t)) >> 7; 358 if(sflag > 1) continue; 359 360 p0 = (25*src[-3*step] + 26*src[-2*step] 361 + 26*src[-1*step] 362 + 26*src[ 0*step] + 25*src[ 1*step] + rv40_dither_l[dmode + i]) >> 7; 363 q0 = (25*src[-2*step] + 26*src[-1*step] 364 + 26*src[ 0*step] 365 + 26*src[ 1*step] + 25*src[ 2*step] + rv40_dither_r[dmode + i]) >> 7; 366 if(sflag){ 367 p0 = av_clip(p0, src[-1*step] - lims, src[-1*step] + lims); 368 q0 = av_clip(q0, src[ 0*step] - lims, src[ 0*step] + lims); 369 } 370 p1 = (25*src[-4*step] + 26*src[-3*step] 371 + 26*src[-2*step] 372 + 26*p0 + 25*src[ 0*step] + rv40_dither_l[dmode + i]) >> 7; 373 q1 = (25*src[-1*step] + 26*q0 374 + 26*src[ 1*step] 375 + 26*src[ 2*step] + 25*src[ 3*step] + rv40_dither_r[dmode + i]) >> 7; 376 if(sflag){ 377 p1 = av_clip(p1, src[-2*step] - lims, src[-2*step] + lims); 378 q1 = av_clip(q1, src[ 1*step] - lims, src[ 1*step] + lims); 379 } 380 src[-2*step] = p1; 381 src[-1*step] = p0; 382 src[ 0*step] = q0; 383 src[ 1*step] = q1; 384 if(!chroma){ 385 src[-3*step] = (25*src[-1*step] + 26*src[-2*step] + 51*src[-3*step] + 26*src[-4*step] + 64) >> 7; 386 src[ 2*step] = (25*src[ 0*step] + 26*src[ 1*step] + 51*src[ 2*step] + 26*src[ 3*step] + 64) >> 7; 387 } 388 } 389 }else if(filter_p1 && filter_q1){ 390 for(i = 0; i < 4; i++, src += stride) 391 rv40_weak_loop_filter(src, step, 1, 1, alpha, beta, lims, lim_q1, lim_p1, 392 diff_p1p0[i], diff_q1q0[i], diff_p1p2[i], diff_q1q2[i]); 393 }else{ 394 for(i = 0; i < 4; i++, src += stride) 395 rv40_weak_loop_filter(src, step, filter_p1, filter_q1, 396 alpha, beta, lims>>1, lim_q1>>1, lim_p1>>1, 397 diff_p1p0[i], diff_q1q0[i], diff_p1p2[i], diff_q1q2[i]); 398 } 399} 400 401static void rv40_v_loop_filter(uint8_t *src, int stride, int dmode, 402 int lim_q1, int lim_p1, 403 int alpha, int beta, int beta2, int chroma, int edge){ 404 rv40_adaptive_loop_filter(src, 1, stride, dmode, lim_q1, lim_p1, 405 alpha, beta, beta2, chroma, edge); 406} 407static void rv40_h_loop_filter(uint8_t *src, int stride, int dmode, 408 int lim_q1, int lim_p1, 409 int alpha, int beta, int beta2, int chroma, int edge){ 410 rv40_adaptive_loop_filter(src, stride, 1, dmode, lim_q1, lim_p1, 411 alpha, beta, beta2, chroma, edge); 412} 413 414enum RV40BlockPos{ 415 POS_CUR, 416 POS_TOP, 417 POS_LEFT, 418 POS_BOTTOM, 419}; 420 421#define MASK_CUR 0x0001 422#define MASK_RIGHT 0x0008 423#define MASK_BOTTOM 0x0010 424#define MASK_TOP 0x1000 425#define MASK_Y_TOP_ROW 0x000F 426#define MASK_Y_LAST_ROW 0xF000 427#define MASK_Y_LEFT_COL 0x1111 428#define MASK_Y_RIGHT_COL 0x8888 429#define MASK_C_TOP_ROW 0x0003 430#define MASK_C_LAST_ROW 0x000C 431#define MASK_C_LEFT_COL 0x0005 432#define MASK_C_RIGHT_COL 0x000A 433 434static const int neighbour_offs_x[4] = { 0, 0, -1, 0 }; 435static const int neighbour_offs_y[4] = { 0, -1, 0, 1 }; 436 437/** 438 * RV40 loop filtering function 439 */ 440static void rv40_loop_filter(RV34DecContext *r, int row) 441{ 442 MpegEncContext *s = &r->s; 443 int mb_pos, mb_x; 444 int i, j, k; 445 uint8_t *Y, *C; 446 int alpha, beta, betaY, betaC; 447 int q; 448 int mbtype[4]; ///< current macroblock and its neighbours types 449 /** 450 * flags indicating that macroblock can be filtered with strong filter 451 * it is set only for intra coded MB and MB with DCs coded separately 452 */ 453 int mb_strong[4]; 454 int clip[4]; ///< MB filter clipping value calculated from filtering strength 455 /** 456 * coded block patterns for luma part of current macroblock and its neighbours 457 * Format: 458 * LSB corresponds to the top left block, 459 * each nibble represents one row of subblocks. 460 */ 461 int cbp[4]; 462 /** 463 * coded block patterns for chroma part of current macroblock and its neighbours 464 * Format is the same as for luma with two subblocks in a row. 465 */ 466 int uvcbp[4][2]; 467 /** 468 * This mask represents the pattern of luma subblocks that should be filtered 469 * in addition to the coded ones because because they lie at the edge of 470 * 8x8 block with different enough motion vectors 471 */ 472 int mvmasks[4]; 473 474 mb_pos = row * s->mb_stride; 475 for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){ 476 int mbtype = s->current_picture_ptr->mb_type[mb_pos]; 477 if(IS_INTRA(mbtype) || IS_SEPARATE_DC(mbtype)) 478 r->cbp_luma [mb_pos] = r->deblock_coefs[mb_pos] = 0xFFFF; 479 if(IS_INTRA(mbtype)) 480 r->cbp_chroma[mb_pos] = 0xFF; 481 } 482 mb_pos = row * s->mb_stride; 483 for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){ 484 int y_h_deblock, y_v_deblock; 485 int c_v_deblock[2], c_h_deblock[2]; 486 int clip_left; 487 int avail[4]; 488 int y_to_deblock, c_to_deblock[2]; 489 490 q = s->current_picture_ptr->qscale_table[mb_pos]; 491 alpha = rv40_alpha_tab[q]; 492 beta = rv40_beta_tab [q]; 493 betaY = betaC = beta * 3; 494 if(s->width * s->height <= 176*144) 495 betaY += beta; 496 497 avail[0] = 1; 498 avail[1] = row; 499 avail[2] = mb_x; 500 avail[3] = row < s->mb_height - 1; 501 for(i = 0; i < 4; i++){ 502 if(avail[i]){ 503 int pos = mb_pos + neighbour_offs_x[i] + neighbour_offs_y[i]*s->mb_stride; 504 mvmasks[i] = r->deblock_coefs[pos]; 505 mbtype [i] = s->current_picture_ptr->mb_type[pos]; 506 cbp [i] = r->cbp_luma[pos]; 507 uvcbp[i][0] = r->cbp_chroma[pos] & 0xF; 508 uvcbp[i][1] = r->cbp_chroma[pos] >> 4; 509 }else{ 510 mvmasks[i] = 0; 511 mbtype [i] = mbtype[0]; 512 cbp [i] = 0; 513 uvcbp[i][0] = uvcbp[i][1] = 0; 514 } 515 mb_strong[i] = IS_INTRA(mbtype[i]) || IS_SEPARATE_DC(mbtype[i]); 516 clip[i] = rv40_filter_clip_tbl[mb_strong[i] + 1][q]; 517 } 518 y_to_deblock = mvmasks[POS_CUR] 519 | (mvmasks[POS_BOTTOM] << 16); 520 /* This pattern contains bits signalling that horizontal edges of 521 * the current block can be filtered. 522 * That happens when either of adjacent subblocks is coded or lies on 523 * the edge of 8x8 blocks with motion vectors differing by more than 524 * 3/4 pel in any component (any edge orientation for some reason). 525 */ 526 y_h_deblock = y_to_deblock 527 | ((cbp[POS_CUR] << 4) & ~MASK_Y_TOP_ROW) 528 | ((cbp[POS_TOP] & MASK_Y_LAST_ROW) >> 12); 529 /* This pattern contains bits signalling that vertical edges of 530 * the current block can be filtered. 531 * That happens when either of adjacent subblocks is coded or lies on 532 * the edge of 8x8 blocks with motion vectors differing by more than 533 * 3/4 pel in any component (any edge orientation for some reason). 534 */ 535 y_v_deblock = y_to_deblock 536 | ((cbp[POS_CUR] << 1) & ~MASK_Y_LEFT_COL) 537 | ((cbp[POS_LEFT] & MASK_Y_RIGHT_COL) >> 3); 538 if(!mb_x) 539 y_v_deblock &= ~MASK_Y_LEFT_COL; 540 if(!row) 541 y_h_deblock &= ~MASK_Y_TOP_ROW; 542 if(row == s->mb_height - 1 || (mb_strong[POS_CUR] || mb_strong[POS_BOTTOM])) 543 y_h_deblock &= ~(MASK_Y_TOP_ROW << 16); 544 /* Calculating chroma patterns is similar and easier since there is 545 * no motion vector pattern for them. 546 */ 547 for(i = 0; i < 2; i++){ 548 c_to_deblock[i] = (uvcbp[POS_BOTTOM][i] << 4) | uvcbp[POS_CUR][i]; 549 c_v_deblock[i] = c_to_deblock[i] 550 | ((uvcbp[POS_CUR] [i] << 1) & ~MASK_C_LEFT_COL) 551 | ((uvcbp[POS_LEFT][i] & MASK_C_RIGHT_COL) >> 1); 552 c_h_deblock[i] = c_to_deblock[i] 553 | ((uvcbp[POS_TOP][i] & MASK_C_LAST_ROW) >> 2) 554 | (uvcbp[POS_CUR][i] << 2); 555 if(!mb_x) 556 c_v_deblock[i] &= ~MASK_C_LEFT_COL; 557 if(!row) 558 c_h_deblock[i] &= ~MASK_C_TOP_ROW; 559 if(row == s->mb_height - 1 || mb_strong[POS_CUR] || mb_strong[POS_BOTTOM]) 560 c_h_deblock[i] &= ~(MASK_C_TOP_ROW << 4); 561 } 562 563 for(j = 0; j < 16; j += 4){ 564 Y = s->current_picture_ptr->data[0] + mb_x*16 + (row*16 + j) * s->linesize; 565 for(i = 0; i < 4; i++, Y += 4){ 566 int ij = i + j; 567 int clip_cur = y_to_deblock & (MASK_CUR << ij) ? clip[POS_CUR] : 0; 568 int dither = j ? ij : i*4; 569 570 // if bottom block is coded then we can filter its top edge 571 // (or bottom edge of this block, which is the same) 572 if(y_h_deblock & (MASK_BOTTOM << ij)){ 573 rv40_h_loop_filter(Y+4*s->linesize, s->linesize, dither, 574 y_to_deblock & (MASK_BOTTOM << ij) ? clip[POS_CUR] : 0, 575 clip_cur, 576 alpha, beta, betaY, 0, 0); 577 } 578 // filter left block edge in ordinary mode (with low filtering strength) 579 if(y_v_deblock & (MASK_CUR << ij) && (i || !(mb_strong[POS_CUR] || mb_strong[POS_LEFT]))){ 580 if(!i) 581 clip_left = mvmasks[POS_LEFT] & (MASK_RIGHT << j) ? clip[POS_LEFT] : 0; 582 else 583 clip_left = y_to_deblock & (MASK_CUR << (ij-1)) ? clip[POS_CUR] : 0; 584 rv40_v_loop_filter(Y, s->linesize, dither, 585 clip_cur, 586 clip_left, 587 alpha, beta, betaY, 0, 0); 588 } 589 // filter top edge of the current macroblock when filtering strength is high 590 if(!j && y_h_deblock & (MASK_CUR << i) && (mb_strong[POS_CUR] || mb_strong[POS_TOP])){ 591 rv40_h_loop_filter(Y, s->linesize, dither, 592 clip_cur, 593 mvmasks[POS_TOP] & (MASK_TOP << i) ? clip[POS_TOP] : 0, 594 alpha, beta, betaY, 0, 1); 595 } 596 // filter left block edge in edge mode (with high filtering strength) 597 if(y_v_deblock & (MASK_CUR << ij) && !i && (mb_strong[POS_CUR] || mb_strong[POS_LEFT])){ 598 clip_left = mvmasks[POS_LEFT] & (MASK_RIGHT << j) ? clip[POS_LEFT] : 0; 599 rv40_v_loop_filter(Y, s->linesize, dither, 600 clip_cur, 601 clip_left, 602 alpha, beta, betaY, 0, 1); 603 } 604 } 605 } 606 for(k = 0; k < 2; k++){ 607 for(j = 0; j < 2; j++){ 608 C = s->current_picture_ptr->data[k+1] + mb_x*8 + (row*8 + j*4) * s->uvlinesize; 609 for(i = 0; i < 2; i++, C += 4){ 610 int ij = i + j*2; 611 int clip_cur = c_to_deblock[k] & (MASK_CUR << ij) ? clip[POS_CUR] : 0; 612 if(c_h_deblock[k] & (MASK_CUR << (ij+2))){ 613 int clip_bot = c_to_deblock[k] & (MASK_CUR << (ij+2)) ? clip[POS_CUR] : 0; 614 rv40_h_loop_filter(C+4*s->uvlinesize, s->uvlinesize, i*8, 615 clip_bot, 616 clip_cur, 617 alpha, beta, betaC, 1, 0); 618 } 619 if((c_v_deblock[k] & (MASK_CUR << ij)) && (i || !(mb_strong[POS_CUR] || mb_strong[POS_LEFT]))){ 620 if(!i) 621 clip_left = uvcbp[POS_LEFT][k] & (MASK_CUR << (2*j+1)) ? clip[POS_LEFT] : 0; 622 else 623 clip_left = c_to_deblock[k] & (MASK_CUR << (ij-1)) ? clip[POS_CUR] : 0; 624 rv40_v_loop_filter(C, s->uvlinesize, j*8, 625 clip_cur, 626 clip_left, 627 alpha, beta, betaC, 1, 0); 628 } 629 if(!j && c_h_deblock[k] & (MASK_CUR << ij) && (mb_strong[POS_CUR] || mb_strong[POS_TOP])){ 630 int clip_top = uvcbp[POS_TOP][k] & (MASK_CUR << (ij+2)) ? clip[POS_TOP] : 0; 631 rv40_h_loop_filter(C, s->uvlinesize, i*8, 632 clip_cur, 633 clip_top, 634 alpha, beta, betaC, 1, 1); 635 } 636 if(c_v_deblock[k] & (MASK_CUR << ij) && !i && (mb_strong[POS_CUR] || mb_strong[POS_LEFT])){ 637 clip_left = uvcbp[POS_LEFT][k] & (MASK_CUR << (2*j+1)) ? clip[POS_LEFT] : 0; 638 rv40_v_loop_filter(C, s->uvlinesize, j*8, 639 clip_cur, 640 clip_left, 641 alpha, beta, betaC, 1, 1); 642 } 643 } 644 } 645 } 646 } 647} 648 649/** 650 * Initialize decoder. 651 */ 652static av_cold int rv40_decode_init(AVCodecContext *avctx) 653{ 654 RV34DecContext *r = avctx->priv_data; 655 656 r->rv30 = 0; 657 ff_rv34_decode_init(avctx); 658 if(!aic_top_vlc.bits) 659 rv40_init_tables(); 660 r->parse_slice_header = rv40_parse_slice_header; 661 r->decode_intra_types = rv40_decode_intra_types; 662 r->decode_mb_info = rv40_decode_mb_info; 663 r->loop_filter = rv40_loop_filter; 664 r->luma_dc_quant_i = rv40_luma_dc_quant[0]; 665 r->luma_dc_quant_p = rv40_luma_dc_quant[1]; 666 return 0; 667} 668 669AVCodec rv40_decoder = { 670 "rv40", 671 AVMEDIA_TYPE_VIDEO, 672 CODEC_ID_RV40, 673 sizeof(RV34DecContext), 674 rv40_decode_init, 675 NULL, 676 ff_rv34_decode_end, 677 ff_rv34_decode_frame, 678 CODEC_CAP_DR1 | CODEC_CAP_DELAY, 679 .flush = ff_mpeg_flush, 680 .long_name = NULL_IF_CONFIG_SMALL("RealVideo 4.0"), 681 .pix_fmts= ff_pixfmt_list_420, 682}; 683