FFmpeg: libavcodec/rv40.c Source File

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rv40.c

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1 /*

2 * RV40 decoder

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 */

22 /**

23 * @file

24 * RV40 decoder

25 */

27 #include "libavutil/imgutils.h"

29 #include "avcodec.h"

30 #include "dsputil.h"

31 #include "mpegvideo.h"

32 #include "golomb.h"

34 #include "rv34.h"

35 #include "rv40vlc2.h"

36 #include "rv40data.h"

38 static VLC aic_top_vlc;

39 static VLC aic_mode1_vlc[AIC_MODE1_NUM], aic_mode2_vlc[AIC_MODE2_NUM];

40 static VLC ptype_vlc[NUM_PTYPE_VLCS], btype_vlc[NUM_BTYPE_VLCS];

42 static const int16_t mode2_offs[] = {

43 0, 614, 1222, 1794, 2410, 3014, 3586, 4202, 4792, 5382, 5966, 6542,

44 7138, 7716, 8292, 8864, 9444, 10030, 10642, 11212, 11814

45 };

47 /**

48 * Initialize all tables.

49 */

50 static av_cold void rv40_init_tables(void)

51 {

52 int i;

53 static VLC_TYPE aic_table[1 << AIC_TOP_BITS][2];

54 static VLC_TYPE aic_mode1_table[AIC_MODE1_NUM << AIC_MODE1_BITS][2];

55 static VLC_TYPE aic_mode2_table[11814][2];

56 static VLC_TYPE ptype_table[NUM_PTYPE_VLCS << PTYPE_VLC_BITS][2];

57 static VLC_TYPE btype_table[NUM_BTYPE_VLCS << BTYPE_VLC_BITS][2];

59 aic_top_vlc.table = aic_table;

60 aic_top_vlc.table_allocated = 1 << AIC_TOP_BITS;

61 init_vlc(&aic_top_vlc, AIC_TOP_BITS, AIC_TOP_SIZE,

62 rv40_aic_top_vlc_bits, 1, 1,

63 rv40_aic_top_vlc_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);

64 for(i = 0; i < AIC_MODE1_NUM; i++){

65 // Every tenth VLC table is empty

66 if((i % 10) == 9) continue;

67 aic_mode1_vlc[i].table = &aic_mode1_table[i << AIC_MODE1_BITS];

68 aic_mode1_vlc[i].table_allocated = 1 << AIC_MODE1_BITS;

69 init_vlc(&aic_mode1_vlc[i], AIC_MODE1_BITS, AIC_MODE1_SIZE,

70 aic_mode1_vlc_bits[i], 1, 1,

71 aic_mode1_vlc_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);

72 }

73 for(i = 0; i < AIC_MODE2_NUM; i++){

74 aic_mode2_vlc[i].table = &aic_mode2_table[mode2_offs[i]];

75 aic_mode2_vlc[i].table_allocated = mode2_offs[i + 1] - mode2_offs[i];

76 init_vlc(&aic_mode2_vlc[i], AIC_MODE2_BITS, AIC_MODE2_SIZE,

77 aic_mode2_vlc_bits[i], 1, 1,

78 aic_mode2_vlc_codes[i], 2, 2, INIT_VLC_USE_NEW_STATIC);

79 }

80 for(i = 0; i < NUM_PTYPE_VLCS; i++){

81 ptype_vlc[i].table = &ptype_table[i << PTYPE_VLC_BITS];

82 ptype_vlc[i].table_allocated = 1 << PTYPE_VLC_BITS;

83 ff_init_vlc_sparse(&ptype_vlc[i], PTYPE_VLC_BITS, PTYPE_VLC_SIZE,

84 ptype_vlc_bits[i], 1, 1,

85 ptype_vlc_codes[i], 1, 1,

86 ptype_vlc_syms, 1, 1, INIT_VLC_USE_NEW_STATIC);

87 }

88 for(i = 0; i < NUM_BTYPE_VLCS; i++){

89 btype_vlc[i].table = &btype_table[i << BTYPE_VLC_BITS];

90 btype_vlc[i].table_allocated = 1 << BTYPE_VLC_BITS;

91 ff_init_vlc_sparse(&btype_vlc[i], BTYPE_VLC_BITS, BTYPE_VLC_SIZE,

92 btype_vlc_bits[i], 1, 1,

93 btype_vlc_codes[i], 1, 1,

94 btype_vlc_syms, 1, 1, INIT_VLC_USE_NEW_STATIC);

95 }

96 }

98 /**

99 * Get stored dimension from bitstream.

100 *

101 * If the width/height is the standard one then it's coded as a 3-bit index.

102 * Otherwise it is coded as escaped 8-bit portions.

103 */

104 static int get_dimension(GetBitContext *gb, const int *dim)

105 {

106 int t = get_bits(gb, 3);

107 int val = dim[t];

108 if(val < 0)

109 val = dim[get_bits1(gb) - val];

110 if(!val){

111 do{

112 t = get_bits(gb, 8);

113 val += t << 2;

114 }while(t == 0xFF);

115 }

116 return val;

117 }

118

119 /**

120 * Get encoded picture size - usually this is called from rv40_parse_slice_header.

121 */

122 static void rv40_parse_picture_size(GetBitContext *gb, int *w, int *h)

123 {

124 *w = get_dimension(gb, rv40_standard_widths);

125 *h = get_dimension(gb, rv40_standard_heights);

126 }

127

128 static int rv40_parse_slice_header(RV34DecContext *r, GetBitContext *gb, SliceInfo *si)

129 {

130 int mb_bits;

131 int w = r->s.width, h = r->s.height;

132 int mb_size;

133

134 memset(si, 0, sizeof(SliceInfo));

135 if(get_bits1(gb))

136 return -1;

137 si->type = get_bits(gb, 2);

138 if(si->type == 1) si->type = 0;

139 si->quant = get_bits(gb, 5);

140 if(get_bits(gb, 2))

141 return -1;

142 si->vlc_set = get_bits(gb, 2);

143 skip_bits1(gb);

144 si->pts = get_bits(gb, 13);

145 if(!si->type || !get_bits1(gb))

146 rv40_parse_picture_size(gb, &w, &h);

147 if(av_image_check_size(w, h, 0, r->s.avctx) < 0)

148 return -1;

149 si->width = w;

150 si->height = h;

151 mb_size = ((w + 15) >> 4) * ((h + 15) >> 4);

152 mb_bits = ff_rv34_get_start_offset(gb, mb_size);

153 si->start = get_bits(gb, mb_bits);

154

155 return 0;

156 }

157

158 /**

159 * Decode 4x4 intra types array.

160 */

161 static int rv40_decode_intra_types(RV34DecContext *r, GetBitContext *gb, int8_t *dst)

162 {

163 MpegEncContext *s = &r->s;

164 int i, j, k, v;

165 int A, B, C;

166 int pattern;

167 int8_t *ptr;

168

169 for(i = 0; i < 4; i++, dst += r->intra_types_stride){

170 if(!i && s->first_slice_line){

171 pattern = get_vlc2(gb, aic_top_vlc.table, AIC_TOP_BITS, 1);

172 dst[0] = (pattern >> 2) & 2;

173 dst[1] = (pattern >> 1) & 2;

174 dst[2] = pattern & 2;

175 dst[3] = (pattern << 1) & 2;

176 continue;

177 }

178 ptr = dst;

179 for(j = 0; j < 4; j++){

180 /* Coefficients are read using VLC chosen by the prediction pattern

181 * The first one (used for retrieving a pair of coefficients) is

182 * constructed from the top, top right and left coefficients

183 * The second one (used for retrieving only one coefficient) is

184 * top + 10 * left.

185 */

186 A = ptr[-r->intra_types_stride + 1]; // it won't be used for the last coefficient in a row

187 B = ptr[-r->intra_types_stride];

188 C = ptr[-1];

189 pattern = A + (B << 4) + (C << 8);

190 for(k = 0; k < MODE2_PATTERNS_NUM; k++)

191 if(pattern == rv40_aic_table_index[k])

192 break;

193 if(j < 3 && k < MODE2_PATTERNS_NUM){ //pattern is found, decoding 2 coefficients

194 v = get_vlc2(gb, aic_mode2_vlc[k].table, AIC_MODE2_BITS, 2);

195 *ptr++ = v/9;

196 *ptr++ = v%9;

197 j++;

198 }else{

199 if(B != -1 && C != -1)

200 v = get_vlc2(gb, aic_mode1_vlc[B + C*10].table, AIC_MODE1_BITS, 1);

201 else{ // tricky decoding

202 v = 0;

203 switch(C){

204 case -1: // code 0 -> 1, 1 -> 0

205 if(B < 2)

206 v = get_bits1(gb) ^ 1;

207 break;

208 case 0:

209 case 2: // code 0 -> 2, 1 -> 0

210 v = (get_bits1(gb) ^ 1) << 1;

211 break;

212 }

213 }

214 *ptr++ = v;

215 }

216 }

217 }

218 return 0;

219 }

220

221 /**

222 * Decode macroblock information.

223 */

224 static int rv40_decode_mb_info(RV34DecContext *r)

225 {

226 MpegEncContext *s = &r->s;

227 GetBitContext *gb = &s->gb;

228 int q, i;

229 int prev_type = 0;

230 int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

231

232 if(!r->s.mb_skip_run) {

233 r->s.mb_skip_run = svq3_get_ue_golomb(gb) + 1;

234 if(r->s.mb_skip_run > (unsigned)s->mb_num)

235 return -1;

236 }

237

238 if(--r->s.mb_skip_run)

239 return RV34_MB_SKIP;

240

241 if(r->avail_cache[6-4]){

242 int blocks[RV34_MB_TYPES] = {0};

243 int count = 0;

244 if(r->avail_cache[6-1])

245 blocks[r->mb_type[mb_pos - 1]]++;

246 blocks[r->mb_type[mb_pos - s->mb_stride]]++;

247 if(r->avail_cache[6-2])

248 blocks[r->mb_type[mb_pos - s->mb_stride + 1]]++;

249 if(r->avail_cache[6-5])

250 blocks[r->mb_type[mb_pos - s->mb_stride - 1]]++;

251 for(i = 0; i < RV34_MB_TYPES; i++){

252 if(blocks[i] > count){

253 count = blocks[i];

254 prev_type = i;

255 if(count>1)

256 break;

257 }

258 }

259 } else if (r->avail_cache[6-1])

260 prev_type = r->mb_type[mb_pos - 1];

261

262 if(s->pict_type == AV_PICTURE_TYPE_P){

263 prev_type = block_num_to_ptype_vlc_num[prev_type];

264 q = get_vlc2(gb, ptype_vlc[prev_type].table, PTYPE_VLC_BITS, 1);

265 if(q < PBTYPE_ESCAPE)

266 return q;

267 q = get_vlc2(gb, ptype_vlc[prev_type].table, PTYPE_VLC_BITS, 1);

268 av_log(s->avctx, AV_LOG_ERROR, "Dquant for P-frame\n");

269 }else{

270 prev_type = block_num_to_btype_vlc_num[prev_type];

271 q = get_vlc2(gb, btype_vlc[prev_type].table, BTYPE_VLC_BITS, 1);

272 if(q < PBTYPE_ESCAPE)

273 return q;

274 q = get_vlc2(gb, btype_vlc[prev_type].table, BTYPE_VLC_BITS, 1);

275 av_log(s->avctx, AV_LOG_ERROR, "Dquant for B-frame\n");

276 }

277 return 0;

278 }

279

280 enum RV40BlockPos{

281 POS_CUR,

282 POS_TOP,

283 POS_LEFT,

284 POS_BOTTOM,

285 };

286

287 #define MASK_CUR 0x0001

288 #define MASK_RIGHT 0x0008

289 #define MASK_BOTTOM 0x0010

290 #define MASK_TOP 0x1000

291 #define MASK_Y_TOP_ROW 0x000F

292 #define MASK_Y_LAST_ROW 0xF000

293 #define MASK_Y_LEFT_COL 0x1111

294 #define MASK_Y_RIGHT_COL 0x8888

295 #define MASK_C_TOP_ROW 0x0003

296 #define MASK_C_LAST_ROW 0x000C

297 #define MASK_C_LEFT_COL 0x0005

298 #define MASK_C_RIGHT_COL 0x000A

299

300 static const int neighbour_offs_x[4] = { 0, 0, -1, 0 };

301 static const int neighbour_offs_y[4] = { 0, -1, 0, 1 };

302

303 static void rv40_adaptive_loop_filter(RV34DSPContext *rdsp,

304 uint8_t *src, int stride, int dmode,

305 int lim_q1, int lim_p1,

306 int alpha, int beta, int beta2,

307 int chroma, int edge, int dir)

308 {

309 int filter_p1, filter_q1;

310 int strong;

311 int lims;

312

313 strong = rdsp->rv40_loop_filter_strength[dir](src, stride, beta, beta2,

314 edge, &filter_p1, &filter_q1);

315

316 lims = filter_p1 + filter_q1 + ((lim_q1 + lim_p1) >> 1) + 1;

317

318 if (strong) {

319 rdsp->rv40_strong_loop_filter[dir](src, stride, alpha,

320 lims, dmode, chroma);

321 } else if (filter_p1 & filter_q1) {

322 rdsp->rv40_weak_loop_filter[dir](src, stride, 1, 1, alpha, beta,

323 lims, lim_q1, lim_p1);

324 } else if (filter_p1 | filter_q1) {

325 rdsp->rv40_weak_loop_filter[dir](src, stride, filter_p1, filter_q1,

326 alpha, beta, lims >> 1, lim_q1 >> 1,

327 lim_p1 >> 1);

328 }

329 }

330

331 /**

332 * RV40 loop filtering function

333 */

334 static void rv40_loop_filter(RV34DecContext *r, int row)

335 {

336 MpegEncContext *s = &r->s;

337 int mb_pos, mb_x;

338 int i, j, k;

339 uint8_t *Y, *C;

340 int alpha, beta, betaY, betaC;

341 int q;

342 int mbtype[4]; ///< current macroblock and its neighbours types

343 /**

344 * flags indicating that macroblock can be filtered with strong filter

345 * it is set only for intra coded MB and MB with DCs coded separately

346 */

347 int mb_strong[4];

348 int clip[4]; ///< MB filter clipping value calculated from filtering strength

349 /**

350 * coded block patterns for luma part of current macroblock and its neighbours

351 * Format:

352 * LSB corresponds to the top left block,

353 * each nibble represents one row of subblocks.

354 */

355 int cbp[4];

356 /**

357 * coded block patterns for chroma part of current macroblock and its neighbours

358 * Format is the same as for luma with two subblocks in a row.

359 */

360 int uvcbp[4][2];

361 /**

362 * This mask represents the pattern of luma subblocks that should be filtered

363 * in addition to the coded ones because because they lie at the edge of

364 * 8x8 block with different enough motion vectors

365 */

366 unsigned mvmasks[4];

367

368 mb_pos = row * s->mb_stride;

369 for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){

370 int mbtype = s->current_picture_ptr->f.mb_type[mb_pos];

371 if(IS_INTRA(mbtype) || IS_SEPARATE_DC(mbtype))

372 r->cbp_luma [mb_pos] = r->deblock_coefs[mb_pos] = 0xFFFF;

373 if(IS_INTRA(mbtype))

374 r->cbp_chroma[mb_pos] = 0xFF;

375 }

376 mb_pos = row * s->mb_stride;

377 for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){

378 int y_h_deblock, y_v_deblock;

379 int c_v_deblock[2], c_h_deblock[2];

380 int clip_left;

381 int avail[4];

382 unsigned y_to_deblock;

383 int c_to_deblock[2];

384

385 q = s->current_picture_ptr->f.qscale_table[mb_pos];

386 alpha = rv40_alpha_tab[q];

387 beta = rv40_beta_tab [q];

388 betaY = betaC = beta * 3;

389 if(s->width * s->height <= 176*144)

390 betaY += beta;

391

392 avail[0] = 1;

393 avail[1] = row;

394 avail[2] = mb_x;

395 avail[3] = row < s->mb_height - 1;

396 for(i = 0; i < 4; i++){

397 if(avail[i]){

398 int pos = mb_pos + neighbour_offs_x[i] + neighbour_offs_y[i]*s->mb_stride;

399 mvmasks[i] = r->deblock_coefs[pos];

400 mbtype [i] = s->current_picture_ptr->f.mb_type[pos];

401 cbp [i] = r->cbp_luma[pos];

402 uvcbp[i][0] = r->cbp_chroma[pos] & 0xF;

403 uvcbp[i][1] = r->cbp_chroma[pos] >> 4;

404 }else{

405 mvmasks[i] = 0;

406 mbtype [i] = mbtype[0];

407 cbp [i] = 0;

408 uvcbp[i][0] = uvcbp[i][1] = 0;

409 }

410 mb_strong[i] = IS_INTRA(mbtype[i]) || IS_SEPARATE_DC(mbtype[i]);

411 clip[i] = rv40_filter_clip_tbl[mb_strong[i] + 1][q];

412 }

413 y_to_deblock = mvmasks[POS_CUR]

414 | (mvmasks[POS_BOTTOM] << 16);

415 /* This pattern contains bits signalling that horizontal edges of

416 * the current block can be filtered.

417 * That happens when either of adjacent subblocks is coded or lies on

418 * the edge of 8x8 blocks with motion vectors differing by more than

419 * 3/4 pel in any component (any edge orientation for some reason).

420 */

421 y_h_deblock = y_to_deblock

422 | ((cbp[POS_CUR] << 4) & ~MASK_Y_TOP_ROW)

423 | ((cbp[POS_TOP] & MASK_Y_LAST_ROW) >> 12);

424 /* This pattern contains bits signalling that vertical edges of

425 * the current block can be filtered.

426 * That happens when either of adjacent subblocks is coded or lies on

427 * the edge of 8x8 blocks with motion vectors differing by more than

428 * 3/4 pel in any component (any edge orientation for some reason).

429 */

430 y_v_deblock = y_to_deblock

431 | ((cbp[POS_CUR] << 1) & ~MASK_Y_LEFT_COL)

432 | ((cbp[POS_LEFT] & MASK_Y_RIGHT_COL) >> 3);

433 if(!mb_x)

434 y_v_deblock &= ~MASK_Y_LEFT_COL;

435 if(!row)

436 y_h_deblock &= ~MASK_Y_TOP_ROW;

437 if(row == s->mb_height - 1 || (mb_strong[POS_CUR] | mb_strong[POS_BOTTOM]))

438 y_h_deblock &= ~(MASK_Y_TOP_ROW << 16);

439 /* Calculating chroma patterns is similar and easier since there is

440 * no motion vector pattern for them.

441 */

442 for(i = 0; i < 2; i++){

443 c_to_deblock[i] = (uvcbp[POS_BOTTOM][i] << 4) | uvcbp[POS_CUR][i];

444 c_v_deblock[i] = c_to_deblock[i]

445 | ((uvcbp[POS_CUR] [i] << 1) & ~MASK_C_LEFT_COL)

446 | ((uvcbp[POS_LEFT][i] & MASK_C_RIGHT_COL) >> 1);

447 c_h_deblock[i] = c_to_deblock[i]

448 | ((uvcbp[POS_TOP][i] & MASK_C_LAST_ROW) >> 2)

449 | (uvcbp[POS_CUR][i] << 2);

450 if(!mb_x)

451 c_v_deblock[i] &= ~MASK_C_LEFT_COL;

452 if(!row)

453 c_h_deblock[i] &= ~MASK_C_TOP_ROW;

454 if(row == s->mb_height - 1 || (mb_strong[POS_CUR] | mb_strong[POS_BOTTOM]))

455 c_h_deblock[i] &= ~(MASK_C_TOP_ROW << 4);

456 }

457

458 for(j = 0; j < 16; j += 4){

459 Y = s->current_picture_ptr->f.data[0] + mb_x*16 + (row*16 + j) * s->linesize;

460 for(i = 0; i < 4; i++, Y += 4){

461 int ij = i + j;

462 int clip_cur = y_to_deblock & (MASK_CUR << ij) ? clip[POS_CUR] : 0;

463 int dither = j ? ij : i*4;

464

465 // if bottom block is coded then we can filter its top edge

466 // (or bottom edge of this block, which is the same)

467 if(y_h_deblock & (MASK_BOTTOM << ij)){

468 rv40_adaptive_loop_filter(&r->rdsp, Y+4*s->linesize,

469 s->linesize, dither,

470 y_to_deblock & (MASK_BOTTOM << ij) ? clip[POS_CUR] : 0,

471 clip_cur, alpha, beta, betaY,

472 0, 0, 0);

473 }

474 // filter left block edge in ordinary mode (with low filtering strength)

475 if(y_v_deblock & (MASK_CUR << ij) && (i || !(mb_strong[POS_CUR] | mb_strong[POS_LEFT]))){

476 if(!i)

477 clip_left = mvmasks[POS_LEFT] & (MASK_RIGHT << j) ? clip[POS_LEFT] : 0;

478 else

479 clip_left = y_to_deblock & (MASK_CUR << (ij-1)) ? clip[POS_CUR] : 0;

480 rv40_adaptive_loop_filter(&r->rdsp, Y, s->linesize, dither,

481 clip_cur,

482 clip_left,

483 alpha, beta, betaY, 0, 0, 1);

484 }

485 // filter top edge of the current macroblock when filtering strength is high

486 if(!j && y_h_deblock & (MASK_CUR << i) && (mb_strong[POS_CUR] | mb_strong[POS_TOP])){

487 rv40_adaptive_loop_filter(&r->rdsp, Y, s->linesize, dither,

488 clip_cur,

489 mvmasks[POS_TOP] & (MASK_TOP << i) ? clip[POS_TOP] : 0,

490 alpha, beta, betaY, 0, 1, 0);

491 }

492 // filter left block edge in edge mode (with high filtering strength)

493 if(y_v_deblock & (MASK_CUR << ij) && !i && (mb_strong[POS_CUR] | mb_strong[POS_LEFT])){

494 clip_left = mvmasks[POS_LEFT] & (MASK_RIGHT << j) ? clip[POS_LEFT] : 0;

495 rv40_adaptive_loop_filter(&r->rdsp, Y, s->linesize, dither,

496 clip_cur,

497 clip_left,

498 alpha, beta, betaY, 0, 1, 1);

499 }

500 }

501 }

502 for(k = 0; k < 2; k++){

503 for(j = 0; j < 2; j++){

504 C = s->current_picture_ptr->f.data[k + 1] + mb_x*8 + (row*8 + j*4) * s->uvlinesize;

505 for(i = 0; i < 2; i++, C += 4){

506 int ij = i + j*2;

507 int clip_cur = c_to_deblock[k] & (MASK_CUR << ij) ? clip[POS_CUR] : 0;

508 if(c_h_deblock[k] & (MASK_CUR << (ij+2))){

509 int clip_bot = c_to_deblock[k] & (MASK_CUR << (ij+2)) ? clip[POS_CUR] : 0;

510 rv40_adaptive_loop_filter(&r->rdsp, C+4*s->uvlinesize, s->uvlinesize, i*8,

511 clip_bot,

512 clip_cur,

513 alpha, beta, betaC, 1, 0, 0);

514 }

515 if((c_v_deblock[k] & (MASK_CUR << ij)) && (i || !(mb_strong[POS_CUR] | mb_strong[POS_LEFT]))){

516 if(!i)

517 clip_left = uvcbp[POS_LEFT][k] & (MASK_CUR << (2*j+1)) ? clip[POS_LEFT] : 0;

518 else

519 clip_left = c_to_deblock[k] & (MASK_CUR << (ij-1)) ? clip[POS_CUR] : 0;

520 rv40_adaptive_loop_filter(&r->rdsp, C, s->uvlinesize, j*8,

521 clip_cur,

522 clip_left,

523 alpha, beta, betaC, 1, 0, 1);

524 }

525 if(!j && c_h_deblock[k] & (MASK_CUR << ij) && (mb_strong[POS_CUR] | mb_strong[POS_TOP])){

526 int clip_top = uvcbp[POS_TOP][k] & (MASK_CUR << (ij+2)) ? clip[POS_TOP] : 0;

527 rv40_adaptive_loop_filter(&r->rdsp, C, s->uvlinesize, i*8,

528 clip_cur,

529 clip_top,

530 alpha, beta, betaC, 1, 1, 0);

531 }

532 if(c_v_deblock[k] & (MASK_CUR << ij) && !i && (mb_strong[POS_CUR] | mb_strong[POS_LEFT])){

533 clip_left = uvcbp[POS_LEFT][k] & (MASK_CUR << (2*j+1)) ? clip[POS_LEFT] : 0;

534 rv40_adaptive_loop_filter(&r->rdsp, C, s->uvlinesize, j*8,

535 clip_cur,

536 clip_left,

537 alpha, beta, betaC, 1, 1, 1);

538 }

539 }

540 }

541 }

542 }

543 }

544

545 /**

546 * Initialize decoder.

547 */

548 static av_cold int rv40_decode_init(AVCodecContext *avctx)

549 {

550 RV34DecContext *r = avctx->priv_data;

551

552 r->rv30 = 0;

553 ff_rv34_decode_init(avctx);

554 if(!aic_top_vlc.bits)

555 rv40_init_tables();

556 r->parse_slice_header = rv40_parse_slice_header;

557 r->decode_intra_types = rv40_decode_intra_types;

558 r->decode_mb_info = rv40_decode_mb_info;

559 r->loop_filter = rv40_loop_filter;

560 r->luma_dc_quant_i = rv40_luma_dc_quant[0];

561 r->luma_dc_quant_p = rv40_luma_dc_quant[1];

562 return 0;

563 }

564

565 AVCodec ff_rv40_decoder = {

566 .name = "rv40",

567 .type = AVMEDIA_TYPE_VIDEO,

568 .id = AV_CODEC_ID_RV40,

569 .priv_data_size = sizeof(RV34DecContext),

570 .init = rv40_decode_init,

571 .close = ff_rv34_decode_end,

572 .decode = ff_rv34_decode_frame,

573 .capabilities = CODEC_CAP_DR1 | CODEC_CAP_DELAY |

574 CODEC_CAP_FRAME_THREADS,

575 .flush = ff_mpeg_flush,

576 .long_name = NULL_IF_CONFIG_SMALL("RealVideo 4.0"),

577 .pix_fmts = ff_pixfmt_list_420,

578 .init_thread_copy = ONLY_IF_THREADS_ENABLED(ff_rv34_decode_init_thread_copy),

579 .update_thread_context = ONLY_IF_THREADS_ENABLED(ff_rv34_decode_update_thread_context),

580 };

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