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 "mpegutils.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 int ret;

134

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

136 if(get_bits1(gb))

137 return AVERROR_INVALIDDATA;

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

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

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

141 if(get_bits(gb, 2))

142 return AVERROR_INVALIDDATA;

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

144 skip_bits1(gb);

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

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

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

148 if ((ret = av_image_check_size(w, h, 0, r->s.avctx)) < 0)

149 return ret;

150 si->width = w;

151 si->height = h;

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

153 mb_bits = ff_rv34_get_start_offset(gb, mb_size);

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

155

156 return 0;

157 }

158

159 /**

160 * Decode 4x4 intra types array.

161 */

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

163 {

164 MpegEncContext *s = &r->s;

165 int i, j, k, v;

166 int A, B, C;

167 int pattern;

168 int8_t *ptr;

169

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

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

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

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

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

175 dst[2] = pattern & 2;

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

177 continue;

178 }

179 ptr = dst;

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

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

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

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

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

185 * top + 10 * left.

186 */

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

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

189 C = ptr[-1];

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

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

192 if(pattern == rv40_aic_table_index[k])

193 break;

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

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

196 *ptr++ = v/9;

197 *ptr++ = v%9;

198 j++;

199 }else{

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

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

202 else{ // tricky decoding

203 v = 0;

204 switch(C){

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

206 if(B < 2)

207 v = get_bits1(gb) ^ 1;

208 break;

209 case 0:

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

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

212 break;

213 }

214 }

215 *ptr++ = v;

216 }

217 }

218 }

219 return 0;

220 }

221

222 /**

223 * Decode macroblock information.

224 */

225 static int rv40_decode_mb_info(RV34DecContext *r)

226 {

227 MpegEncContext *s = &r->s;

228 GetBitContext *gb = &s->gb;

229 int q, i;

230 int prev_type = 0;

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

232

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

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

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

236 return -1;

237 }

238

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

240 return RV34_MB_SKIP;

241

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

243 int blocks[RV34_MB_TYPES] = {0};

244 int count = 0;

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

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

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

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

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

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

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

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

253 if(blocks[i] > count){

254 count = blocks[i];

255 prev_type = i;

256 if(count>1)

257 break;

258 }

259 }

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

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

262

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

264 prev_type = block_num_to_ptype_vlc_num[prev_type];

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

266 if(q < PBTYPE_ESCAPE)

267 return q;

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

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

270 }else{

271 prev_type = block_num_to_btype_vlc_num[prev_type];

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

273 if(q < PBTYPE_ESCAPE)

274 return q;

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

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

277 }

278 return 0;

279 }

280

281 enum RV40BlockPos{

282 POS_CUR,

283 POS_TOP,

284 POS_LEFT,

285 POS_BOTTOM,

286 };

287

288 #define MASK_CUR 0x0001

289 #define MASK_RIGHT 0x0008

290 #define MASK_BOTTOM 0x0010

291 #define MASK_TOP 0x1000

292 #define MASK_Y_TOP_ROW 0x000F

293 #define MASK_Y_LAST_ROW 0xF000

294 #define MASK_Y_LEFT_COL 0x1111

295 #define MASK_Y_RIGHT_COL 0x8888

296 #define MASK_C_TOP_ROW 0x0003

297 #define MASK_C_LAST_ROW 0x000C

298 #define MASK_C_LEFT_COL 0x0005

299 #define MASK_C_RIGHT_COL 0x000A

300

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

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

303

304 static void rv40_adaptive_loop_filter(RV34DSPContext *rdsp,

305 uint8_t *src, int stride, int dmode,

306 int lim_q1, int lim_p1,

307 int alpha, int beta, int beta2,

308 int chroma, int edge, int dir)

309 {

310 int filter_p1, filter_q1;

311 int strong;

312 int lims;

313

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

315 edge, &filter_p1, &filter_q1);

316

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

318

319 if (strong) {

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

321 lims, dmode, chroma);

322 } else if (filter_p1 & filter_q1) {

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

324 lims, lim_q1, lim_p1);

325 } else if (filter_p1 | filter_q1) {

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

327 alpha, beta, lims >> 1, lim_q1 >> 1,

328 lim_p1 >> 1);

329 }

330 }

331

332 /**

333 * RV40 loop filtering function

334 */

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

336 {

337 MpegEncContext *s = &r->s;

338 int mb_pos, mb_x;

339 int i, j, k;

340 uint8_t *Y, *C;

341 int alpha, beta, betaY, betaC;

342 int q;

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

344 /**

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

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

347 */

348 int mb_strong[4];

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

350 /**

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

352 * Format:

353 * LSB corresponds to the top left block,

354 * each nibble represents one row of subblocks.

355 */

356 int cbp[4];

357 /**

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

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

360 */

361 int uvcbp[4][2];

362 /**

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

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

365 * 8x8 block with different enough motion vectors

366 */

367 unsigned mvmasks[4];

368

369 mb_pos = row * s->mb_stride;

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

371 int mbtype = s->current_picture_ptr->mb_type[mb_pos];

372 if(IS_INTRA(mbtype) || IS_SEPARATE_DC(mbtype))

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

374 if(IS_INTRA(mbtype))

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

376 }

377 mb_pos = row * s->mb_stride;

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

379 int y_h_deblock, y_v_deblock;

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

381 int clip_left;

382 int avail[4];

383 unsigned y_to_deblock;

384 int c_to_deblock[2];

385

386 q = s->current_picture_ptr->qscale_table[mb_pos];

387 alpha = rv40_alpha_tab[q];

388 beta = rv40_beta_tab [q];

389 betaY = betaC = beta * 3;

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

391 betaY += beta;

392

393 avail[0] = 1;

394 avail[1] = row;

395 avail[2] = mb_x;

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

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

398 if(avail[i]){

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

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

401 mbtype [i] = s->current_picture_ptr->mb_type[pos];

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

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

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

405 }else{

406 mvmasks[i] = 0;

407 mbtype [i] = mbtype[0];

408 cbp [i] = 0;

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

410 }

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

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

413 }

414 y_to_deblock = mvmasks[POS_CUR]

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

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

417 * the current block can be filtered.

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

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

420 * 3/4 pel in any component (any edge orientation for some reason).

421 */

422 y_h_deblock = y_to_deblock

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

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

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

426 * the current block can be filtered.

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

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

429 * 3/4 pel in any component (any edge orientation for some reason).

430 */

431 y_v_deblock = y_to_deblock

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

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

434 if(!mb_x)

435 y_v_deblock &= ~MASK_Y_LEFT_COL;

436 if(!row)

437 y_h_deblock &= ~MASK_Y_TOP_ROW;

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

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

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

441 * no motion vector pattern for them.

442 */

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

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

445 c_v_deblock[i] = c_to_deblock[i]

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

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

448 c_h_deblock[i] = c_to_deblock[i]

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

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

451 if(!mb_x)

452 c_v_deblock[i] &= ~MASK_C_LEFT_COL;

453 if(!row)

454 c_h_deblock[i] &= ~MASK_C_TOP_ROW;

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

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

457 }

458

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

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

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

462 int ij = i + j;

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

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

465

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

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

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

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

470 s->linesize, dither,

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

472 clip_cur, alpha, beta, betaY,

473 0, 0, 0);

474 }

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

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

477 if(!i)

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

479 else

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

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

482 clip_cur,

483 clip_left,

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

485 }

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

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

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

489 clip_cur,

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

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

492 }

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

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

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

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

497 clip_cur,

498 clip_left,

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

500 }

501 }

502 }

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

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

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

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

507 int ij = i + j*2;

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

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

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

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

512 clip_bot,

513 clip_cur,

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

515 }

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

517 if(!i)

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

519 else

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

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

522 clip_cur,

523 clip_left,

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

525 }

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

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

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

529 clip_cur,

530 clip_top,

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

532 }

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

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

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

536 clip_cur,

537 clip_left,

538 alpha, beta, betaC, 1, 1, 1);

539 }

540 }

541 }

542 }

543 }

544 }

545

546 /**

547 * Initialize decoder.

548 */

549 static av_cold int rv40_decode_init(AVCodecContext *avctx)

550 {

551 RV34DecContext *r = avctx->priv_data;

552 int ret;

553

554 r->rv30 = 0;

555 if ((ret = ff_rv34_decode_init(avctx)) < 0)

556 return ret;

557 if(!aic_top_vlc.bits)

558 rv40_init_tables();

559 r->parse_slice_header = rv40_parse_slice_header;

560 r->decode_intra_types = rv40_decode_intra_types;

561 r->decode_mb_info = rv40_decode_mb_info;

562 r->loop_filter = rv40_loop_filter;

563 r->luma_dc_quant_i = rv40_luma_dc_quant[0];

564 r->luma_dc_quant_p = rv40_luma_dc_quant[1];

565 return 0;

566 }

567

568 AVCodec ff_rv40_decoder = {

569 .name = "rv40",

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

571 .type = AVMEDIA_TYPE_VIDEO,

572 .id = AV_CODEC_ID_RV40,

573 .priv_data_size = sizeof(RV34DecContext),

574 .init = rv40_decode_init,

575 .close = ff_rv34_decode_end,

576 .decode = ff_rv34_decode_frame,

577 .capabilities = CODEC_CAP_DR1 | CODEC_CAP_DELAY |

578 CODEC_CAP_FRAME_THREADS,

579 .flush = ff_mpeg_flush,

580 .pix_fmts = (const enum AVPixelFormat[]) {

581 AV_PIX_FMT_YUV420P,

582 AV_PIX_FMT_NONE

583 },

584 .init_thread_copy = ONLY_IF_THREADS_ENABLED(ff_rv34_decode_init_thread_copy),

585 .update_thread_context = ONLY_IF_THREADS_ENABLED(ff_rv34_decode_update_thread_context),

586 };

Generated on Sun Mar 8 2015 02:34:59 for FFmpeg by doxygen 1.8.2