FFmpeg: libavcodec/ituh263dec.c Source File

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ituh263dec.c

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1 /*

2 * ITU H263 bitstream decoder

4 * H263+ support.

7 *

8 * This file is part of FFmpeg.

9 *

10 * FFmpeg is free software; you can redistribute it and/or

11 * modify it under the terms of the GNU Lesser General Public

12 * License as published by the Free Software Foundation; either

13 * version 2.1 of the License, or (at your option) any later version.

14 *

15 * FFmpeg is distributed in the hope that it will be useful,

16 * but WITHOUT ANY WARRANTY; without even the implied warranty of

17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

18 * Lesser General Public License for more details.

19 *

20 * You should have received a copy of the GNU Lesser General Public

21 * License along with FFmpeg; if not, write to the Free Software

22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

23 */

25 /**

26 * @file

27 * h263 decoder.

28 */

30 #define UNCHECKED_BITSTREAM_READER 1

31 #include <limits.h>

33 #include "libavutil/attributes.h"

34 #include "libavutil/internal.h"

35 #include "libavutil/mathematics.h"

36 #include "avcodec.h"

37 #include "mpegvideo.h"

38 #include "h263.h"

39 #include "internal.h"

40 #include "mathops.h"

41 #include "mpegutils.h"

42 #include "unary.h"

43 #include "flv.h"

44 #include "mpeg4video.h"

45 #include "mpegvideodata.h"

47 // The defines below define the number of bits that are read at once for

48 // reading vlc values. Changing these may improve speed and data cache needs

49 // be aware though that decreasing them may need the number of stages that is

50 // passed to get_vlc* to be increased.

51 #define MV_VLC_BITS 9

52 #define H263_MBTYPE_B_VLC_BITS 6

53 #define CBPC_B_VLC_BITS 3

55 static const int h263_mb_type_b_map[15]= {

56 MB_TYPE_DIRECT2 | MB_TYPE_L0L1,

57 MB_TYPE_DIRECT2 | MB_TYPE_L0L1 | MB_TYPE_CBP,

58 MB_TYPE_DIRECT2 | MB_TYPE_L0L1 | MB_TYPE_CBP | MB_TYPE_QUANT,

59 MB_TYPE_L0 | MB_TYPE_16x16,

60 MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_16x16,

61 MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_QUANT | MB_TYPE_16x16,

62 MB_TYPE_L1 | MB_TYPE_16x16,

63 MB_TYPE_L1 | MB_TYPE_CBP | MB_TYPE_16x16,

64 MB_TYPE_L1 | MB_TYPE_CBP | MB_TYPE_QUANT | MB_TYPE_16x16,

65 MB_TYPE_L0L1 | MB_TYPE_16x16,

66 MB_TYPE_L0L1 | MB_TYPE_CBP | MB_TYPE_16x16,

67 MB_TYPE_L0L1 | MB_TYPE_CBP | MB_TYPE_QUANT | MB_TYPE_16x16,

68 0, //stuffing

69 MB_TYPE_INTRA4x4 | MB_TYPE_CBP,

70 MB_TYPE_INTRA4x4 | MB_TYPE_CBP | MB_TYPE_QUANT,

71 };

73 void ff_h263_show_pict_info(MpegEncContext *s){

74 if(s->avctx->debug&FF_DEBUG_PICT_INFO){

75 av_log(s->avctx, AV_LOG_DEBUG, "qp:%d %c size:%d rnd:%d%s%s%s%s%s%s%s%s%s %d/%d\n",

76 s->qscale, av_get_picture_type_char(s->pict_type),

77 s->gb.size_in_bits, 1-s->no_rounding,

78 s->obmc ? " AP" : "",

79 s->umvplus ? " UMV" : "",

80 s->h263_long_vectors ? " LONG" : "",

81 s->h263_plus ? " +" : "",

82 s->h263_aic ? " AIC" : "",

83 s->alt_inter_vlc ? " AIV" : "",

84 s->modified_quant ? " MQ" : "",

85 s->loop_filter ? " LOOP" : "",

86 s->h263_slice_structured ? " SS" : "",

87 s->avctx->framerate.num, s->avctx->framerate.den

88 );

89 }

90 }

92 /***********************************************/

93 /* decoding */

95 VLC ff_h263_intra_MCBPC_vlc;

96 VLC ff_h263_inter_MCBPC_vlc;

97 VLC ff_h263_cbpy_vlc;

98 static VLC mv_vlc;

99 static VLC h263_mbtype_b_vlc;

100 static VLC cbpc_b_vlc;

101

102 /* init vlcs */

103

104 /* XXX: find a better solution to handle static init */

105 av_cold void ff_h263_decode_init_vlc(void)

106 {

107 static volatile int done = 0;

108

109 if (!done) {

110 INIT_VLC_STATIC(&ff_h263_intra_MCBPC_vlc, INTRA_MCBPC_VLC_BITS, 9,

111 ff_h263_intra_MCBPC_bits, 1, 1,

112 ff_h263_intra_MCBPC_code, 1, 1, 72);

113 INIT_VLC_STATIC(&ff_h263_inter_MCBPC_vlc, INTER_MCBPC_VLC_BITS, 28,

114 ff_h263_inter_MCBPC_bits, 1, 1,

115 ff_h263_inter_MCBPC_code, 1, 1, 198);

116 INIT_VLC_STATIC(&ff_h263_cbpy_vlc, CBPY_VLC_BITS, 16,

117 &ff_h263_cbpy_tab[0][1], 2, 1,

118 &ff_h263_cbpy_tab[0][0], 2, 1, 64);

119 INIT_VLC_STATIC(&mv_vlc, MV_VLC_BITS, 33,

120 &ff_mvtab[0][1], 2, 1,

121 &ff_mvtab[0][0], 2, 1, 538);

122 ff_rl_init(&ff_h263_rl_inter, ff_h263_static_rl_table_store[0]);

123 ff_rl_init(&ff_rl_intra_aic, ff_h263_static_rl_table_store[1]);

124 INIT_VLC_RL(ff_h263_rl_inter, 554);

125 INIT_VLC_RL(ff_rl_intra_aic, 554);

126 INIT_VLC_STATIC(&h263_mbtype_b_vlc, H263_MBTYPE_B_VLC_BITS, 15,

127 &ff_h263_mbtype_b_tab[0][1], 2, 1,

128 &ff_h263_mbtype_b_tab[0][0], 2, 1, 80);

129 INIT_VLC_STATIC(&cbpc_b_vlc, CBPC_B_VLC_BITS, 4,

130 &ff_cbpc_b_tab[0][1], 2, 1,

131 &ff_cbpc_b_tab[0][0], 2, 1, 8);

132 done = 1;

133 }

134 }

135

136 int ff_h263_decode_mba(MpegEncContext *s)

137 {

138 int i, mb_pos;

139

140 for(i=0; i<6; i++){

141 if(s->mb_num-1 <= ff_mba_max[i]) break;

142 }

143 mb_pos= get_bits(&s->gb, ff_mba_length[i]);

144 s->mb_x= mb_pos % s->mb_width;

145 s->mb_y= mb_pos / s->mb_width;

146

147 return mb_pos;

148 }

149

150 /**

151 * Decode the group of blocks header or slice header.

152 * @return <0 if an error occurred

153 */

154 static int h263_decode_gob_header(MpegEncContext *s)

155 {

156 unsigned int val, gob_number;

157 int left;

158

159 /* Check for GOB Start Code */

160 val = show_bits(&s->gb, 16);

161 if(val)

162 return -1;

163

164 /* We have a GBSC probably with GSTUFF */

165 skip_bits(&s->gb, 16); /* Drop the zeros */

166 left= get_bits_left(&s->gb);

167 //MN: we must check the bits left or we might end in a infinite loop (or segfault)

168 for(;left>13; left--){

169 if(get_bits1(&s->gb)) break; /* Seek the '1' bit */

170 }

171 if(left<=13)

172 return -1;

173

174 if(s->h263_slice_structured){

175 if(check_marker(&s->gb, "before MBA")==0)

176 return -1;

177

178 ff_h263_decode_mba(s);

179

180 if(s->mb_num > 1583)

181 if(check_marker(&s->gb, "after MBA")==0)

182 return -1;

183

184 s->qscale = get_bits(&s->gb, 5); /* SQUANT */

185 if(check_marker(&s->gb, "after SQUANT")==0)

186 return -1;

187 skip_bits(&s->gb, 2); /* GFID */

188 }else{

189 gob_number = get_bits(&s->gb, 5); /* GN */

190 s->mb_x= 0;

191 s->mb_y= s->gob_index* gob_number;

192 skip_bits(&s->gb, 2); /* GFID */

193 s->qscale = get_bits(&s->gb, 5); /* GQUANT */

194 }

195

196 if(s->mb_y >= s->mb_height)

197 return -1;

198

199 if(s->qscale==0)

200 return -1;

201

202 return 0;

203 }

204

205 /**

206 * Decode the group of blocks / video packet header.

207 * @return bit position of the resync_marker, or <0 if none was found

208 */

209 int ff_h263_resync(MpegEncContext *s){

210 int left, pos, ret;

211

212 if(s->codec_id==AV_CODEC_ID_MPEG4){

213 skip_bits1(&s->gb);

214 align_get_bits(&s->gb);

215 }

216

217 if(show_bits(&s->gb, 16)==0){

218 pos= get_bits_count(&s->gb);

219 if(CONFIG_MPEG4_DECODER && s->codec_id==AV_CODEC_ID_MPEG4)

220 ret= ff_mpeg4_decode_video_packet_header(s->avctx->priv_data);

221 else

222 ret= h263_decode_gob_header(s);

223 if(ret>=0)

224 return pos;

225 }

226 //OK, it's not where it is supposed to be ...

227 s->gb= s->last_resync_gb;

228 align_get_bits(&s->gb);

229 left= get_bits_left(&s->gb);

230

231 for(;left>16+1+5+5; left-=8){

232 if(show_bits(&s->gb, 16)==0){

233 GetBitContext bak= s->gb;

234

235 pos= get_bits_count(&s->gb);

236 if(CONFIG_MPEG4_DECODER && s->codec_id==AV_CODEC_ID_MPEG4)

237 ret= ff_mpeg4_decode_video_packet_header(s->avctx->priv_data);

238 else

239 ret= h263_decode_gob_header(s);

240 if(ret>=0)

241 return pos;

242

243 s->gb= bak;

244 }

245 skip_bits(&s->gb, 8);

246 }

247

248 return -1;

249 }

250

251 int ff_h263_decode_motion(MpegEncContext * s, int pred, int f_code)

252 {

253 int code, val, sign, shift;

254 code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);

255

256 if (code == 0)

257 return pred;

258 if (code < 0)

259 return 0xffff;

260

261 sign = get_bits1(&s->gb);

262 shift = f_code - 1;

263 val = code;

264 if (shift) {

265 val = (val - 1) << shift;

266 val |= get_bits(&s->gb, shift);

267 val++;

268 }

269 if (sign)

270 val = -val;

271 val += pred;

272

273 /* modulo decoding */

274 if (!s->h263_long_vectors) {

275 val = sign_extend(val, 5 + f_code);

276 } else {

277 /* horrible h263 long vector mode */

278 if (pred < -31 && val < -63)

279 val += 64;

280 if (pred > 32 && val > 63)

281 val -= 64;

282

283 }

284 return val;

285 }

286

287

288 /* Decode RVLC of H.263+ UMV */

289 static int h263p_decode_umotion(MpegEncContext * s, int pred)

290 {

291 int code = 0, sign;

292

293 if (get_bits1(&s->gb)) /* Motion difference = 0 */

294 return pred;

295

296 code = 2 + get_bits1(&s->gb);

297

298 while (get_bits1(&s->gb))

299 {

300 code <<= 1;

301 code += get_bits1(&s->gb);

302 }

303 sign = code & 1;

304 code >>= 1;

305

306 code = (sign) ? (pred - code) : (pred + code);

307 ff_tlog(s->avctx,"H.263+ UMV Motion = %d\n", code);

308 return code;

309

310 }

311

312 /**

313 * read the next MVs for OBMC. yes this is a ugly hack, feel free to send a patch :)

314 */

315 static void preview_obmc(MpegEncContext *s){

316 GetBitContext gb= s->gb;

317

318 int cbpc, i, pred_x, pred_y, mx, my;

319 int16_t *mot_val;

320 const int xy= s->mb_x + 1 + s->mb_y * s->mb_stride;

321 const int stride= s->b8_stride*2;

322

323 for(i=0; i<4; i++)

324 s->block_index[i]+= 2;

325 for(i=4; i<6; i++)

326 s->block_index[i]+= 1;

327 s->mb_x++;

328

329 av_assert2(s->pict_type == AV_PICTURE_TYPE_P);

330

331 do{

332 if (get_bits1(&s->gb)) {

333 /* skip mb */

334 mot_val = s->current_picture.motion_val[0][s->block_index[0]];

335 mot_val[0 ]= mot_val[2 ]=

336 mot_val[0+stride]= mot_val[2+stride]= 0;

337 mot_val[1 ]= mot_val[3 ]=

338 mot_val[1+stride]= mot_val[3+stride]= 0;

339

340 s->current_picture.mb_type[xy] = MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;

341 goto end;

342 }

343 cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);

344 }while(cbpc == 20);

345

346 if(cbpc & 4){

347 s->current_picture.mb_type[xy] = MB_TYPE_INTRA;

348 }else{

349 get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);

350 if (cbpc & 8) {

351 if(s->modified_quant){

352 if(get_bits1(&s->gb)) skip_bits(&s->gb, 1);

353 else skip_bits(&s->gb, 5);

354 }else

355 skip_bits(&s->gb, 2);

356 }

357

358 if ((cbpc & 16) == 0) {

359 s->current_picture.mb_type[xy] = MB_TYPE_16x16 | MB_TYPE_L0;

360 /* 16x16 motion prediction */

361 mot_val= ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);

362 if (s->umvplus)

363 mx = h263p_decode_umotion(s, pred_x);

364 else

365 mx = ff_h263_decode_motion(s, pred_x, 1);

366

367 if (s->umvplus)

368 my = h263p_decode_umotion(s, pred_y);

369 else

370 my = ff_h263_decode_motion(s, pred_y, 1);

371

372 mot_val[0 ]= mot_val[2 ]=

373 mot_val[0+stride]= mot_val[2+stride]= mx;

374 mot_val[1 ]= mot_val[3 ]=

375 mot_val[1+stride]= mot_val[3+stride]= my;

376 } else {

377 s->current_picture.mb_type[xy] = MB_TYPE_8x8 | MB_TYPE_L0;

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

379 mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);

380 if (s->umvplus)

381 mx = h263p_decode_umotion(s, pred_x);

382 else

383 mx = ff_h263_decode_motion(s, pred_x, 1);

384

385 if (s->umvplus)

386 my = h263p_decode_umotion(s, pred_y);

387 else

388 my = ff_h263_decode_motion(s, pred_y, 1);

389 if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1)

390 skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */

391 mot_val[0] = mx;

392 mot_val[1] = my;

393 }

394 }

395 }

396 end:

397

398 for(i=0; i<4; i++)

399 s->block_index[i]-= 2;

400 for(i=4; i<6; i++)

401 s->block_index[i]-= 1;

402 s->mb_x--;

403

404 s->gb= gb;

405 }

406

407 static void h263_decode_dquant(MpegEncContext *s){

408 static const int8_t quant_tab[4] = { -1, -2, 1, 2 };

409

410 if(s->modified_quant){

411 if(get_bits1(&s->gb))

412 s->qscale= ff_modified_quant_tab[get_bits1(&s->gb)][ s->qscale ];

413 else

414 s->qscale= get_bits(&s->gb, 5);

415 }else

416 s->qscale += quant_tab[get_bits(&s->gb, 2)];

417 ff_set_qscale(s, s->qscale);

418 }

419

420 static int h263_decode_block(MpegEncContext * s, int16_t * block,

421 int n, int coded)

422 {

423 int level, i, j, run;

424 RLTable *rl = &ff_h263_rl_inter;

425 const uint8_t *scan_table;

426 GetBitContext gb= s->gb;

427

428 scan_table = s->intra_scantable.permutated;

429 if (s->h263_aic && s->mb_intra) {

430 rl = &ff_rl_intra_aic;

431 i = 0;

432 if (s->ac_pred) {

433 if (s->h263_aic_dir)

434 scan_table = s->intra_v_scantable.permutated; /* left */

435 else

436 scan_table = s->intra_h_scantable.permutated; /* top */

437 }

438 } else if (s->mb_intra) {

439 /* DC coef */

440 if (CONFIG_RV10_DECODER && s->codec_id == AV_CODEC_ID_RV10) {

441 if (s->rv10_version == 3 && s->pict_type == AV_PICTURE_TYPE_I) {

442 int component, diff;

443 component = (n <= 3 ? 0 : n - 4 + 1);

444 level = s->last_dc[component];

445 if (s->rv10_first_dc_coded[component]) {

446 diff = ff_rv_decode_dc(s, n);

447 if (diff == 0xffff)

448 return -1;

449 level += diff;

450 level = level & 0xff; /* handle wrap round */

451 s->last_dc[component] = level;

452 } else {

453 s->rv10_first_dc_coded[component] = 1;

454 }

455 } else {

456 level = get_bits(&s->gb, 8);

457 if (level == 255)

458 level = 128;

459 }

460 }else{

461 level = get_bits(&s->gb, 8);

462 if((level&0x7F) == 0){

463 av_log(s->avctx, AV_LOG_ERROR, "illegal dc %d at %d %d\n", level, s->mb_x, s->mb_y);

464 if (s->avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT))

465 return -1;

466 }

467 if (level == 255)

468 level = 128;

469 }

470 block[0] = level;

471 i = 1;

472 } else {

473 i = 0;

474 }

475 if (!coded) {

476 if (s->mb_intra && s->h263_aic)

477 goto not_coded;

478 s->block_last_index[n] = i - 1;

479 return 0;

480 }

481 retry:

482 {

483 OPEN_READER(re, &s->gb);

484 i--; // offset by -1 to allow direct indexing of scan_table

485 for(;;) {

486 UPDATE_CACHE(re, &s->gb);

487 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);

488 if (run == 66) {

489 if (level){

490 CLOSE_READER(re, &s->gb);

491 av_log(s->avctx, AV_LOG_ERROR, "illegal ac vlc code at %dx%d\n", s->mb_x, s->mb_y);

492 return -1;

493 }

494 /* escape */

495 if (CONFIG_FLV_DECODER && s->h263_flv > 1) {

496 int is11 = SHOW_UBITS(re, &s->gb, 1);

497 SKIP_CACHE(re, &s->gb, 1);

498 run = SHOW_UBITS(re, &s->gb, 7) + 1;

499 if (is11) {

500 SKIP_COUNTER(re, &s->gb, 1 + 7);

501 UPDATE_CACHE(re, &s->gb);

502 level = SHOW_SBITS(re, &s->gb, 11);

503 SKIP_COUNTER(re, &s->gb, 11);

504 } else {

505 SKIP_CACHE(re, &s->gb, 7);

506 level = SHOW_SBITS(re, &s->gb, 7);

507 SKIP_COUNTER(re, &s->gb, 1 + 7 + 7);

508 }

509 } else {

510 run = SHOW_UBITS(re, &s->gb, 7) + 1;

511 SKIP_CACHE(re, &s->gb, 7);

512 level = (int8_t)SHOW_UBITS(re, &s->gb, 8);

513 SKIP_COUNTER(re, &s->gb, 7 + 8);

514 if(level == -128){

515 UPDATE_CACHE(re, &s->gb);

516 if (s->codec_id == AV_CODEC_ID_RV10) {

517 /* XXX: should patch encoder too */

518 level = SHOW_SBITS(re, &s->gb, 12);

519 SKIP_COUNTER(re, &s->gb, 12);

520 }else{

521 level = SHOW_UBITS(re, &s->gb, 5);

522 SKIP_CACHE(re, &s->gb, 5);

523 level |= SHOW_SBITS(re, &s->gb, 6)<<5;

524 SKIP_COUNTER(re, &s->gb, 5 + 6);

525 }

526 }

527 }

528 } else {

529 if (SHOW_UBITS(re, &s->gb, 1))

530 level = -level;

531 SKIP_COUNTER(re, &s->gb, 1);

532 }

533 i += run;

534 if (i >= 64){

535 CLOSE_READER(re, &s->gb);

536 // redo update without last flag, revert -1 offset

537 i = i - run + ((run-1)&63) + 1;

538 if (i < 64) {

539 // only last marker, no overrun

540 block[scan_table[i]] = level;

541 break;

542 }

543 if(s->alt_inter_vlc && rl == &ff_h263_rl_inter && !s->mb_intra){

544 //Looks like a hack but no, it's the way it is supposed to work ...

545 rl = &ff_rl_intra_aic;

546 i = 0;

547 s->gb= gb;

548 s->bdsp.clear_block(block);

549 goto retry;

550 }

551 av_log(s->avctx, AV_LOG_ERROR, "run overflow at %dx%d i:%d\n", s->mb_x, s->mb_y, s->mb_intra);

552 return -1;

553 }

554 j = scan_table[i];

555 block[j] = level;

556 }

557 }

558 not_coded:

559 if (s->mb_intra && s->h263_aic) {

560 ff_h263_pred_acdc(s, block, n);

561 i = 63;

562 }

563 s->block_last_index[n] = i;

564 return 0;

565 }

566

567 static int h263_skip_b_part(MpegEncContext *s, int cbp)

568 {

569 LOCAL_ALIGNED_16(int16_t, dblock, [64]);

570 int i, mbi;

571 int bli[6];

572

573 /* we have to set s->mb_intra to zero to decode B-part of PB-frame correctly

574 * but real value should be restored in order to be used later (in OBMC condition)

575 */

576 mbi = s->mb_intra;

577 memcpy(bli, s->block_last_index, sizeof(bli));

578 s->mb_intra = 0;

579 for (i = 0; i < 6; i++) {

580 if (h263_decode_block(s, dblock, i, cbp&32) < 0)

581 return -1;

582 cbp+=cbp;

583 }

584 s->mb_intra = mbi;

585 memcpy(s->block_last_index, bli, sizeof(bli));

586 return 0;

587 }

588

589 static int h263_get_modb(GetBitContext *gb, int pb_frame, int *cbpb)

590 {

591 int c, mv = 1;

592

593 if (pb_frame < 3) { // h.263 Annex G and i263 PB-frame

594 c = get_bits1(gb);

595 if (pb_frame == 2 && c)

596 mv = !get_bits1(gb);

597 } else { // h.263 Annex M improved PB-frame

598 mv = get_unary(gb, 0, 4) + 1;

599 c = mv & 1;

600 mv = !!(mv & 2);

601 }

602 if(c)

603 *cbpb = get_bits(gb, 6);

604 return mv;

605 }

606

607 int ff_h263_decode_mb(MpegEncContext *s,

608 int16_t block[6][64])

609 {

610 int cbpc, cbpy, i, cbp, pred_x, pred_y, mx, my, dquant;

611 int16_t *mot_val;

612 const int xy= s->mb_x + s->mb_y * s->mb_stride;

613 int cbpb = 0, pb_mv_count = 0;

614

615 av_assert2(!s->h263_pred);

616

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

618 do{

619 if (get_bits1(&s->gb)) {

620 /* skip mb */

621 s->mb_intra = 0;

622 for(i=0;i<6;i++)

623 s->block_last_index[i] = -1;

624 s->mv_dir = MV_DIR_FORWARD;

625 s->mv_type = MV_TYPE_16X16;

626 s->current_picture.mb_type[xy] = MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;

627 s->mv[0][0][0] = 0;

628 s->mv[0][0][1] = 0;

629 s->mb_skipped = !(s->obmc | s->loop_filter);

630 goto end;

631 }

632 cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);

633 if (cbpc < 0){

634 av_log(s->avctx, AV_LOG_ERROR, "cbpc damaged at %d %d\n", s->mb_x, s->mb_y);

635 return -1;

636 }

637 }while(cbpc == 20);

638

639 s->bdsp.clear_blocks(s->block[0]);

640

641 dquant = cbpc & 8;

642 s->mb_intra = ((cbpc & 4) != 0);

643 if (s->mb_intra) goto intra;

644

645 if(s->pb_frame && get_bits1(&s->gb))

646 pb_mv_count = h263_get_modb(&s->gb, s->pb_frame, &cbpb);

647 cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);

648

649 if(s->alt_inter_vlc==0 || (cbpc & 3)!=3)

650 cbpy ^= 0xF;

651

652 cbp = (cbpc & 3) | (cbpy << 2);

653 if (dquant) {

654 h263_decode_dquant(s);

655 }

656

657 s->mv_dir = MV_DIR_FORWARD;

658 if ((cbpc & 16) == 0) {

659 s->current_picture.mb_type[xy] = MB_TYPE_16x16 | MB_TYPE_L0;

660 /* 16x16 motion prediction */

661 s->mv_type = MV_TYPE_16X16;

662 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);

663 if (s->umvplus)

664 mx = h263p_decode_umotion(s, pred_x);

665 else

666 mx = ff_h263_decode_motion(s, pred_x, 1);

667

668 if (mx >= 0xffff)

669 return -1;

670

671 if (s->umvplus)

672 my = h263p_decode_umotion(s, pred_y);

673 else

674 my = ff_h263_decode_motion(s, pred_y, 1);

675

676 if (my >= 0xffff)

677 return -1;

678 s->mv[0][0][0] = mx;

679 s->mv[0][0][1] = my;

680

681 if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1)

682 skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */

683 } else {

684 s->current_picture.mb_type[xy] = MB_TYPE_8x8 | MB_TYPE_L0;

685 s->mv_type = MV_TYPE_8X8;

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

687 mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);

688 if (s->umvplus)

689 mx = h263p_decode_umotion(s, pred_x);

690 else

691 mx = ff_h263_decode_motion(s, pred_x, 1);

692 if (mx >= 0xffff)

693 return -1;

694

695 if (s->umvplus)

696 my = h263p_decode_umotion(s, pred_y);

697 else

698 my = ff_h263_decode_motion(s, pred_y, 1);

699 if (my >= 0xffff)

700 return -1;

701 s->mv[0][i][0] = mx;

702 s->mv[0][i][1] = my;

703 if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1)

704 skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */

705 mot_val[0] = mx;

706 mot_val[1] = my;

707 }

708 }

709 } else if(s->pict_type==AV_PICTURE_TYPE_B) {

710 int mb_type;

711 const int stride= s->b8_stride;

712 int16_t *mot_val0 = s->current_picture.motion_val[0][2 * (s->mb_x + s->mb_y * stride)];

713 int16_t *mot_val1 = s->current_picture.motion_val[1][2 * (s->mb_x + s->mb_y * stride)];

714 // const int mv_xy= s->mb_x + 1 + s->mb_y * s->mb_stride;

715

716 //FIXME ugly

717 mot_val0[0 ]= mot_val0[2 ]= mot_val0[0+2*stride]= mot_val0[2+2*stride]=

718 mot_val0[1 ]= mot_val0[3 ]= mot_val0[1+2*stride]= mot_val0[3+2*stride]=

719 mot_val1[0 ]= mot_val1[2 ]= mot_val1[0+2*stride]= mot_val1[2+2*stride]=

720 mot_val1[1 ]= mot_val1[3 ]= mot_val1[1+2*stride]= mot_val1[3+2*stride]= 0;

721

722 do{

723 mb_type= get_vlc2(&s->gb, h263_mbtype_b_vlc.table, H263_MBTYPE_B_VLC_BITS, 2);

724 if (mb_type < 0){

725 av_log(s->avctx, AV_LOG_ERROR, "b mb_type damaged at %d %d\n", s->mb_x, s->mb_y);

726 return -1;

727 }

728

729 mb_type= h263_mb_type_b_map[ mb_type ];

730 }while(!mb_type);

731

732 s->mb_intra = IS_INTRA(mb_type);

733 if(HAS_CBP(mb_type)){

734 s->bdsp.clear_blocks(s->block[0]);

735 cbpc = get_vlc2(&s->gb, cbpc_b_vlc.table, CBPC_B_VLC_BITS, 1);

736 if(s->mb_intra){

737 dquant = IS_QUANT(mb_type);

738 goto intra;

739 }

740

741 cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);

742

743 if (cbpy < 0){

744 av_log(s->avctx, AV_LOG_ERROR, "b cbpy damaged at %d %d\n", s->mb_x, s->mb_y);

745 return -1;

746 }

747

748 if(s->alt_inter_vlc==0 || (cbpc & 3)!=3)

749 cbpy ^= 0xF;

750

751 cbp = (cbpc & 3) | (cbpy << 2);

752 }else

753 cbp=0;

754

755 av_assert2(!s->mb_intra);

756

757 if(IS_QUANT(mb_type)){

758 h263_decode_dquant(s);

759 }

760

761 if(IS_DIRECT(mb_type)){

762 s->mv_dir = MV_DIR_FORWARD | MV_DIR_BACKWARD | MV_DIRECT;

763 mb_type |= ff_mpeg4_set_direct_mv(s, 0, 0);

764 }else{

765 s->mv_dir = 0;

766 s->mv_type= MV_TYPE_16X16;

767 //FIXME UMV

768

769 if(USES_LIST(mb_type, 0)){

770 int16_t *mot_val= ff_h263_pred_motion(s, 0, 0, &mx, &my);

771 s->mv_dir = MV_DIR_FORWARD;

772

773 mx = ff_h263_decode_motion(s, mx, 1);

774 my = ff_h263_decode_motion(s, my, 1);

775

776 s->mv[0][0][0] = mx;

777 s->mv[0][0][1] = my;

778 mot_val[0 ]= mot_val[2 ]= mot_val[0+2*stride]= mot_val[2+2*stride]= mx;

779 mot_val[1 ]= mot_val[3 ]= mot_val[1+2*stride]= mot_val[3+2*stride]= my;

780 }

781

782 if(USES_LIST(mb_type, 1)){

783 int16_t *mot_val= ff_h263_pred_motion(s, 0, 1, &mx, &my);

784 s->mv_dir |= MV_DIR_BACKWARD;

785

786 mx = ff_h263_decode_motion(s, mx, 1);

787 my = ff_h263_decode_motion(s, my, 1);

788

789 s->mv[1][0][0] = mx;

790 s->mv[1][0][1] = my;

791 mot_val[0 ]= mot_val[2 ]= mot_val[0+2*stride]= mot_val[2+2*stride]= mx;

792 mot_val[1 ]= mot_val[3 ]= mot_val[1+2*stride]= mot_val[3+2*stride]= my;

793 }

794 }

795

796 s->current_picture.mb_type[xy] = mb_type;

797 } else { /* I-Frame */

798 do{

799 cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);

800 if (cbpc < 0){

801 av_log(s->avctx, AV_LOG_ERROR, "I cbpc damaged at %d %d\n", s->mb_x, s->mb_y);

802 return -1;

803 }

804 }while(cbpc == 8);

805

806 s->bdsp.clear_blocks(s->block[0]);

807

808 dquant = cbpc & 4;

809 s->mb_intra = 1;

810 intra:

811 s->current_picture.mb_type[xy] = MB_TYPE_INTRA;

812 if (s->h263_aic) {

813 s->ac_pred = get_bits1(&s->gb);

814 if(s->ac_pred){

815 s->current_picture.mb_type[xy] = MB_TYPE_INTRA | MB_TYPE_ACPRED;

816

817 s->h263_aic_dir = get_bits1(&s->gb);

818 }

819 }else

820 s->ac_pred = 0;

821

822 if(s->pb_frame && get_bits1(&s->gb))

823 pb_mv_count = h263_get_modb(&s->gb, s->pb_frame, &cbpb);

824 cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);

825 if(cbpy<0){

826 av_log(s->avctx, AV_LOG_ERROR, "I cbpy damaged at %d %d\n", s->mb_x, s->mb_y);

827 return -1;

828 }

829 cbp = (cbpc & 3) | (cbpy << 2);

830 if (dquant) {

831 h263_decode_dquant(s);

832 }

833

834 pb_mv_count += !!s->pb_frame;

835 }

836

837 while(pb_mv_count--){

838 ff_h263_decode_motion(s, 0, 1);

839 ff_h263_decode_motion(s, 0, 1);

840 }

841

842 /* decode each block */

843 for (i = 0; i < 6; i++) {

844 if (h263_decode_block(s, block[i], i, cbp&32) < 0)

845 return -1;

846 cbp+=cbp;

847 }

848

849 if(s->pb_frame && h263_skip_b_part(s, cbpb) < 0)

850 return -1;

851 if(s->obmc && !s->mb_intra){

852 if(s->pict_type == AV_PICTURE_TYPE_P && s->mb_x+1<s->mb_width && s->mb_num_left != 1)

853 preview_obmc(s);

854 }

855 end:

856

857 /* per-MB end of slice check */

858 {

859 int v= show_bits(&s->gb, 16);

860

861 if (get_bits_left(&s->gb) < 16) {

862 v >>= 16 - get_bits_left(&s->gb);

863 }

864

865 if(v==0)

866 return SLICE_END;

867 }

868

869 return SLICE_OK;

870 }

871

872 /* most is hardcoded. should extend to handle all h263 streams */

873 int ff_h263_decode_picture_header(MpegEncContext *s)

874 {

875 int format, width, height, i;

876 uint32_t startcode;

877

878 align_get_bits(&s->gb);

879

880 if (show_bits(&s->gb, 2) == 2 && s->avctx->frame_number == 0) {

881 av_log(s->avctx, AV_LOG_WARNING, "Header looks like RTP instead of H.263\n");

882 }

883

884 startcode= get_bits(&s->gb, 22-8);

885

886 for(i= get_bits_left(&s->gb); i>24; i-=8) {

887 startcode = ((startcode << 8) | get_bits(&s->gb, 8)) & 0x003FFFFF;

888

889 if(startcode == 0x20)

890 break;

891 }

892

893 if (startcode != 0x20) {

894 av_log(s->avctx, AV_LOG_ERROR, "Bad picture start code\n");

895 return -1;

896 }

897 /* temporal reference */

898 i = get_bits(&s->gb, 8); /* picture timestamp */

899 if( (s->picture_number&~0xFF)+i < s->picture_number)

900 i+= 256;

901 s->picture_number= (s->picture_number&~0xFF) + i;

902

903 /* PTYPE starts here */

904 if (check_marker(&s->gb, "in PTYPE") != 1) {

905 return -1;

906 }

907 if (get_bits1(&s->gb) != 0) {

908 av_log(s->avctx, AV_LOG_ERROR, "Bad H263 id\n");

909 return -1; /* h263 id */

910 }

911 skip_bits1(&s->gb); /* split screen off */

912 skip_bits1(&s->gb); /* camera off */

913 skip_bits1(&s->gb); /* freeze picture release off */

914

915 format = get_bits(&s->gb, 3);

916 /*

917 0 forbidden

918 1 sub-QCIF

919 10 QCIF

920 7 extended PTYPE (PLUSPTYPE)

921 */

922

923 if (format != 7 && format != 6) {

924 s->h263_plus = 0;

925 /* H.263v1 */

926 width = ff_h263_format[format][0];

927 height = ff_h263_format[format][1];

928 if (!width)

929 return -1;

930

931 s->pict_type = AV_PICTURE_TYPE_I + get_bits1(&s->gb);

932

933 s->h263_long_vectors = get_bits1(&s->gb);

934

935 if (get_bits1(&s->gb) != 0) {

936 av_log(s->avctx, AV_LOG_ERROR, "H263 SAC not supported\n");

937 return -1; /* SAC: off */

938 }

939 s->obmc= get_bits1(&s->gb); /* Advanced prediction mode */

940 s->unrestricted_mv = s->h263_long_vectors || s->obmc;

941

942 s->pb_frame = get_bits1(&s->gb);

943 s->chroma_qscale= s->qscale = get_bits(&s->gb, 5);

944 skip_bits1(&s->gb); /* Continuous Presence Multipoint mode: off */

945

946 s->width = width;

947 s->height = height;

948 s->avctx->sample_aspect_ratio= (AVRational){12,11};

949 s->avctx->framerate = (AVRational){ 30000, 1001 };

950 } else {

951 int ufep;

952

953 /* H.263v2 */

954 s->h263_plus = 1;

955 ufep = get_bits(&s->gb, 3); /* Update Full Extended PTYPE */

956

957 /* ufep other than 0 and 1 are reserved */

958 if (ufep == 1) {

959 /* OPPTYPE */

960 format = get_bits(&s->gb, 3);

961 ff_dlog(s->avctx, "ufep=1, format: %d\n", format);

962 s->custom_pcf= get_bits1(&s->gb);

963 s->umvplus = get_bits1(&s->gb); /* Unrestricted Motion Vector */

964 if (get_bits1(&s->gb) != 0) {

965 av_log(s->avctx, AV_LOG_ERROR, "Syntax-based Arithmetic Coding (SAC) not supported\n");

966 }

967 s->obmc= get_bits1(&s->gb); /* Advanced prediction mode */

968 s->h263_aic = get_bits1(&s->gb); /* Advanced Intra Coding (AIC) */

969 s->loop_filter= get_bits1(&s->gb);

970 s->unrestricted_mv = s->umvplus || s->obmc || s->loop_filter;

971 if(s->avctx->lowres)

972 s->loop_filter = 0;

973

974 s->h263_slice_structured= get_bits1(&s->gb);

975 if (get_bits1(&s->gb) != 0) {

976 av_log(s->avctx, AV_LOG_ERROR, "Reference Picture Selection not supported\n");

977 }

978 if (get_bits1(&s->gb) != 0) {

979 av_log(s->avctx, AV_LOG_ERROR, "Independent Segment Decoding not supported\n");

980 }

981 s->alt_inter_vlc= get_bits1(&s->gb);

982 s->modified_quant= get_bits1(&s->gb);

983 if(s->modified_quant)

984 s->chroma_qscale_table= ff_h263_chroma_qscale_table;

985

986 skip_bits(&s->gb, 1); /* Prevent start code emulation */

987

988 skip_bits(&s->gb, 3); /* Reserved */

989 } else if (ufep != 0) {

990 av_log(s->avctx, AV_LOG_ERROR, "Bad UFEP type (%d)\n", ufep);

991 return -1;

992 }

993

994 /* MPPTYPE */

995 s->pict_type = get_bits(&s->gb, 3);

996 switch(s->pict_type){

997 case 0: s->pict_type= AV_PICTURE_TYPE_I;break;

998 case 1: s->pict_type= AV_PICTURE_TYPE_P;break;

999 case 2: s->pict_type= AV_PICTURE_TYPE_P;s->pb_frame = 3;break;

1000 case 3: s->pict_type= AV_PICTURE_TYPE_B;break;

1001 case 7: s->pict_type= AV_PICTURE_TYPE_I;break; //ZYGO

1002 default:

1003 return -1;

1004 }

1005 skip_bits(&s->gb, 2);

1006 s->no_rounding = get_bits1(&s->gb);

1007 skip_bits(&s->gb, 4);

1008

1009 /* Get the picture dimensions */

1010 if (ufep) {

1011 if (format == 6) {

1012 /* Custom Picture Format (CPFMT) */

1013 s->aspect_ratio_info = get_bits(&s->gb, 4);

1014 ff_dlog(s->avctx, "aspect: %d\n", s->aspect_ratio_info);

1015 /* aspect ratios:

1016 0 - forbidden

1017 1 - 1:1

1018 2 - 12:11 (CIF 4:3)

1019 3 - 10:11 (525-type 4:3)

1020 4 - 16:11 (CIF 16:9)

1021 5 - 40:33 (525-type 16:9)

1022 6-14 - reserved

1023 */

1024 width = (get_bits(&s->gb, 9) + 1) * 4;

1025 check_marker(&s->gb, "in dimensions");

1026 height = get_bits(&s->gb, 9) * 4;

1027 ff_dlog(s->avctx, "\nH.263+ Custom picture: %dx%d\n",width,height);

1028 if (s->aspect_ratio_info == FF_ASPECT_EXTENDED) {

1029 /* aspected dimensions */

1030 s->avctx->sample_aspect_ratio.num= get_bits(&s->gb, 8);

1031 s->avctx->sample_aspect_ratio.den= get_bits(&s->gb, 8);

1032 }else{

1033 s->avctx->sample_aspect_ratio= ff_h263_pixel_aspect[s->aspect_ratio_info];

1034 }

1035 } else {

1036 width = ff_h263_format[format][0];

1037 height = ff_h263_format[format][1];

1038 s->avctx->sample_aspect_ratio= (AVRational){12,11};

1039 }

1040 s->avctx->sample_aspect_ratio.den <<= s->ehc_mode;

1041 if ((width == 0) || (height == 0))

1042 return -1;

1043 s->width = width;

1044 s->height = height;

1045

1046 if(s->custom_pcf){

1047 int gcd;

1048 s->avctx->framerate.num = 1800000;

1049 s->avctx->framerate.den = 1000 + get_bits1(&s->gb);

1050 s->avctx->framerate.den *= get_bits(&s->gb, 7);

1051 if(s->avctx->framerate.den == 0){

1052 av_log(s, AV_LOG_ERROR, "zero framerate\n");

1053 return -1;

1054 }

1055 gcd= av_gcd(s->avctx->framerate.den, s->avctx->framerate.num);

1056 s->avctx->framerate.den /= gcd;

1057 s->avctx->framerate.num /= gcd;

1058 }else{

1059 s->avctx->framerate = (AVRational){ 30000, 1001 };

1060 }

1061 }

1062

1063 if(s->custom_pcf){

1064 skip_bits(&s->gb, 2); //extended Temporal reference

1065 }

1066

1067 if (ufep) {

1068 if (s->umvplus) {

1069 if(get_bits1(&s->gb)==0) /* Unlimited Unrestricted Motion Vectors Indicator (UUI) */

1070 skip_bits1(&s->gb);

1071 }

1072 if(s->h263_slice_structured){

1073 if (get_bits1(&s->gb) != 0) {

1074 av_log(s->avctx, AV_LOG_ERROR, "rectangular slices not supported\n");

1075 }

1076 if (get_bits1(&s->gb) != 0) {

1077 av_log(s->avctx, AV_LOG_ERROR, "unordered slices not supported\n");

1078 }

1079 }

1080 }

1081

1082 s->qscale = get_bits(&s->gb, 5);

1083 }

1084

1085 if (s->width == 0 || s->height == 0) {

1086 av_log(s->avctx, AV_LOG_ERROR, "dimensions 0\n");

1087 return -1;

1088 }

1089 s->mb_width = (s->width + 15) / 16;

1090 s->mb_height = (s->height + 15) / 16;

1091 s->mb_num = s->mb_width * s->mb_height;

1092

1093 if (s->pb_frame) {

1094 skip_bits(&s->gb, 3); /* Temporal reference for B-pictures */

1095 if (s->custom_pcf)

1096 skip_bits(&s->gb, 2); //extended Temporal reference

1097 skip_bits(&s->gb, 2); /* Quantization information for B-pictures */

1098 }

1099

1100 if (s->pict_type!=AV_PICTURE_TYPE_B) {

1101 s->time = s->picture_number;

1102 s->pp_time = s->time - s->last_non_b_time;

1103 s->last_non_b_time = s->time;

1104 }else{

1105 s->time = s->picture_number;

1106 s->pb_time = s->pp_time - (s->last_non_b_time - s->time);

1107 if (s->pp_time <=s->pb_time ||

1108 s->pp_time <= s->pp_time - s->pb_time ||

1109 s->pp_time <= 0){

1110 s->pp_time = 2;

1111 s->pb_time = 1;

1112 }

1113 ff_mpeg4_init_direct_mv(s);

1114 }

1115

1116 /* PEI */

1117 if (skip_1stop_8data_bits(&s->gb) < 0)

1118 return AVERROR_INVALIDDATA;

1119

1120 if(s->h263_slice_structured){

1121 if (check_marker(&s->gb, "SEPB1") != 1) {

1122 return -1;

1123 }

1124

1125 ff_h263_decode_mba(s);

1126

1127 if (check_marker(&s->gb, "SEPB2") != 1) {

1128 return -1;

1129 }

1130 }

1131 s->f_code = 1;

1132

1133 if(s->h263_aic){

1134 s->y_dc_scale_table=

1135 s->c_dc_scale_table= ff_aic_dc_scale_table;

1136 }else{

1137 s->y_dc_scale_table=

1138 s->c_dc_scale_table= ff_mpeg1_dc_scale_table;

1139 }

1140

1141 ff_h263_show_pict_info(s);

1142 if (s->pict_type == AV_PICTURE_TYPE_I && s->codec_tag == AV_RL32("ZYGO") && get_bits_left(&s->gb) >= 85 + 13*3*16 + 50){

1143 int i,j;

1144 for(i=0; i<85; i++) av_log(s->avctx, AV_LOG_DEBUG, "%d", get_bits1(&s->gb));

1145 av_log(s->avctx, AV_LOG_DEBUG, "\n");

1146 for(i=0; i<13; i++){

1147 for(j=0; j<3; j++){

1148 int v= get_bits(&s->gb, 8);

1149 v |= get_sbits(&s->gb, 8)<<8;

1150 av_log(s->avctx, AV_LOG_DEBUG, " %5d", v);

1151 }

1152 av_log(s->avctx, AV_LOG_DEBUG, "\n");

1153 }

1154 for(i=0; i<50; i++) av_log(s->avctx, AV_LOG_DEBUG, "%d", get_bits1(&s->gb));

1155 }

1156

1157 return 0;

1158 }

ff_h263_decode_init_vlc

av_cold void ff_h263_decode_init_vlc(void)

Definition: ituh263dec.c:105

MpegEncContext::rv10_first_dc_coded

int rv10_first_dc_coded[3]

Definition: mpegvideo.h:484

ff_tlog

#define ff_tlog(ctx,...)

Definition: internal.h:60

AVCodecContext::framerate

AVRational framerate

Definition: avcodec.h:3023

MB_TYPE_SKIP

#define MB_TYPE_SKIP

Definition: avcodec.h:905

val

const char const char void * val

Definition: avisynth_c.h:634

float v

Definition: avf_showspectrum.c:96

MpegEncContext::aspect_ratio_info

int aspect_ratio_info

Definition: mpegvideo.h:465

MpegEncContext::picture_number

int picture_number

Definition: mpegvideo.h:196

const char * s

Definition: avisynth_c.h:631

AVERROR_INVALIDDATA

#define AVERROR_INVALIDDATA

Invalid data found when processing input.

Definition: error.h:59

MpegEncContext::intra_v_scantable

ScanTable intra_v_scantable

Definition: mpegvideo.h:162

ff_cbpc_b_tab

const uint8_t ff_cbpc_b_tab[4][2]

Definition: h263data.h:78

h263_decode_gob_header

static int h263_decode_gob_header(MpegEncContext *s)

Decode the group of blocks header or slice header.

Definition: ituh263dec.c:154

shift

static int shift(int a, int b)

Definition: sonic.c:82

ff_h263_inter_MCBPC_vlc

VLC ff_h263_inter_MCBPC_vlc

Definition: ituh263dec.c:96

CBPY_VLC_BITS

#define CBPY_VLC_BITS

Definition: h263.h:40

GET_RL_VLC

#define GET_RL_VLC

Definition: get_bits.h:689

MpegEncContext::y_dc_scale_table

const uint8_t * y_dc_scale_table

qscale -> y_dc_scale table

Definition: mpegvideo.h:257

BlockDSPContext::clear_block

void(* clear_block)(int16_t *block)

Definition: blockdsp.h:35

mpeg4video.h

get_bits

static unsigned int get_bits(GetBitContext *s, int n)

Read 1-25 bits.

Definition: get_bits.h:260

AV_LOG_WARNING

#define AV_LOG_WARNING

Something somehow does not look correct.

Definition: log.h:182

ff_h263_rl_inter

RLTable ff_h263_rl_inter

Definition: h263data.h:162

ff_h263_intra_MCBPC_code

const uint8_t ff_h263_intra_MCBPC_code[9]

Definition: h263data.h:36

SKIP_COUNTER

#define SKIP_COUNTER(name, gb, num)

Definition: get_bits.h:180

ff_h263_cbpy_tab

const uint8_t ff_h263_cbpy_tab[16][2]

Definition: h263data.h:85

AVRational::num

int num

numerator

Definition: rational.h:44

MB_TYPE_INTRA4x4

#define MB_TYPE_INTRA4x4

Definition: avcodec.h:894

MpegEncContext::codec_id

enum AVCodecID codec_id

Definition: mpegvideo.h:181

BlockDSPContext::clear_blocks

void(* clear_blocks)(int16_t *blocks)

Definition: blockdsp.h:36

MpegEncContext::obmc

int obmc

overlapped block motion compensation

Definition: mpegvideo.h:432

AVCodecContext::sample_aspect_ratio

AVRational sample_aspect_ratio

sample aspect ratio (0 if unknown) That is the width of a pixel divided by the height of the pixel...

Definition: avcodec.h:1623

MB_TYPE_INTRA

#define MB_TYPE_INTRA

Definition: mpegutils.h:69

h263_decode_block

static int h263_decode_block(MpegEncContext *s, int16_t *block, int n, int coded)

Definition: ituh263dec.c:420

MB_TYPE_QUANT

#define MB_TYPE_QUANT

Definition: avcodec.h:913

AV_CODEC_ID_MPEG4

Definition: avcodec.h:120

mpegvideo.h

mpegvideo header.

HAS_CBP

#define HAS_CBP(a)

Definition: mpegutils.h:97

ScanTable::permutated

uint8_t permutated[64]

Definition: idctdsp.h:31

run

uint8_t run

Definition: svq3.c:149

ff_h263_format

const uint16_t ff_h263_format[8][2]

Definition: h263data.h:239

SLICE_OK

#define SLICE_OK

Definition: mpegvideo.h:561

MpegEncContext::mb_num

int mb_num

number of MBs of a picture

Definition: mpegvideo.h:202

RLTable

RLTable.

Definition: rl.h:38

MpegEncContext::qscale

int qscale

QP.

Definition: mpegvideo.h:273

ff_modified_quant_tab

const uint8_t ff_modified_quant_tab[2][32]

Definition: h263data.h:253

get_sbits

static int get_sbits(GetBitContext *s, int n)

Definition: get_bits.h:245

MpegEncContext::h263_aic

int h263_aic

Advanded INTRA Coding (AIC)

Definition: mpegvideo.h:156

ff_h263_pred_motion

int16_t * ff_h263_pred_motion(MpegEncContext *s, int block, int dir, int *px, int *py)

Definition: h263.c:313

attributes.h

Macro definitions for various function/variable attributes.

MpegEncContext::modified_quant

int modified_quant

Definition: mpegvideo.h:444

mathematics.h

USES_LIST

#define USES_LIST(a, list)

Definition: mpegutils.h:95

MpegEncContext::alt_inter_vlc

int alt_inter_vlc

alternative inter vlc

Definition: mpegvideo.h:443

MpegEncContext::mb_num_left

int mb_num_left

number of MBs left in this video packet (for partitioned Slices only)

Definition: mpegvideo.h:425

MpegEncContext::time

int64_t time

time of current frame

Definition: mpegvideo.h:453

ff_mpeg1_dc_scale_table

const uint8_t ff_mpeg1_dc_scale_table[128]

Definition: mpegvideodata.c:27

MV_DIRECT

#define MV_DIRECT

bidirectional mode where the difference equals the MV of the last P/S/I-Frame (mpeg4) ...

Definition: mpegvideo.h:331

uint8_t

Definition: audio_convert.c:194

av_cold

#define av_cold

Definition: attributes.h:74

av_assert2

#define av_assert2(cond)

assert() equivalent, that does lie in speed critical code.

Definition: avassert.h:63

INIT_VLC_STATIC

#define INIT_VLC_STATIC(vlc, bits, a, b, c, d, e, f, g, static_size)

Definition: get_bits.h:476

ff_h263_intra_MCBPC_bits

const uint8_t ff_h263_intra_MCBPC_bits[9]

Definition: h263data.h:37

ff_mvtab

const uint8_t ff_mvtab[33][2]

Definition: h263data.h:91

end

static av_cold int end(AVCodecContext *avctx)

Definition: avrndec.c:67

h263_mbtype_b_vlc

static VLC h263_mbtype_b_vlc

Definition: ituh263dec.c:99

MpegEncContext::no_rounding

int no_rounding

apply no rounding to motion compensation (MPEG4, msmpeg4, ...) for b-frames rounding mode is always 0...

Definition: mpegvideo.h:351

ff_h263_inter_MCBPC_bits

const uint8_t ff_h263_inter_MCBPC_bits[28]

Definition: h263data.h:50

MpegEncContext::current_picture

Picture current_picture

copy of the current picture structure.

Definition: mpegvideo.h:249

MpegEncContext::last_resync_gb

GetBitContext last_resync_gb

used to search for the next resync marker

Definition: mpegvideo.h:424

MpegEncContext::gob_index

int gob_index

Definition: mpegvideo.h:431

get_bits_count

static int get_bits_count(const GetBitContext *s)

Definition: get_bits.h:212

ff_rl_intra_aic

RLTable ff_rl_intra_aic

Definition: h263data.h:231

av_get_picture_type_char

char av_get_picture_type_char(enum AVPictureType pict_type)

Return a single letter to describe the given picture type pict_type.

Definition: utils.c:84

MpegEncContext::pp_time

uint16_t pp_time

time distance between the last 2 p,s,i frames

Definition: mpegvideo.h:455

MpegEncContext::mb_height

int mb_height

number of MBs horizontally & vertically

Definition: mpegvideo.h:198

AVCodecContext::lowres

int lowres

low resolution decoding, 1-> 1/2 size, 2->1/4 size

Definition: avcodec.h:2737

h263_skip_b_part

static int h263_skip_b_part(MpegEncContext *s, int cbp)

Definition: ituh263dec.c:567

mpegutils.h

MpegEncContext::codec_tag

int codec_tag

internal codec_tag upper case converted from avctx codec_tag

Definition: mpegvideo.h:189

ff_h263_pixel_aspect

const AVRational ff_h263_pixel_aspect[16]

Definition: h263data.h:275

av_log

#define av_log(a,...)

Definition: tableprint_vlc.h:28

ff_set_qscale

void ff_set_qscale(MpegEncContext *s, int qscale)

set qscale and update qscale dependent variables.

Definition: mpegvideo.c:3240

ff_mba_length

const uint8_t ff_mba_length[7]

Definition: h263data.h:271

flv.h

get_bits_left

static int get_bits_left(GetBitContext *gb)

Definition: get_bits.h:588

H263_MBTYPE_B_VLC_BITS

#define H263_MBTYPE_B_VLC_BITS

Definition: ituh263dec.c:52

MpegEncContext::h263_plus

int h263_plus

h263 plus headers

Definition: mpegvideo.h:178

UPDATE_CACHE

#define UPDATE_CACHE(name, gb)

Definition: get_bits.h:173

AV_LOG_ERROR

#define AV_LOG_ERROR

Something went wrong and cannot losslessly be recovered.

Definition: log.h:176

MpegEncContext::last_dc

int last_dc[3]

last DC values for MPEG1

Definition: mpegvideo.h:254

MpegEncContext::mb_skipped

int mb_skipped

MUST BE SET only during DECODING.

Definition: mpegvideo.h:264

MpegEncContext::unrestricted_mv

int unrestricted_mv

mv can point outside of the coded picture

Definition: mpegvideo.h:292

ff_h263_decode_motion

int ff_h263_decode_motion(MpegEncContext *s, int pred, int f_code)

Definition: ituh263dec.c:251

AV_LOG_DEBUG

#define AV_LOG_DEBUG

Stuff which is only useful for libav* developers.

Definition: log.h:197

h263_mb_type_b_map

static const int h263_mb_type_b_map[15]

Definition: ituh263dec.c:55

MpegEncContext::h263_slice_structured

int h263_slice_structured

Definition: mpegvideo.h:442

INTER_MCBPC_VLC_BITS

#define INTER_MCBPC_VLC_BITS

Definition: h263.h:39

av_gcd

int64_t av_gcd(int64_t a, int64_t b)

Return the greatest common divisor of a and b.

Definition: mathematics.c:55

ff_mpeg4_init_direct_mv

void ff_mpeg4_init_direct_mv(MpegEncContext *s)

Definition: mpeg4video.c:71

ff_mpeg4_decode_video_packet_header

int ff_mpeg4_decode_video_packet_header(Mpeg4DecContext *ctx)

Decode the next video packet.

Definition: mpeg4videodec.c:396

h263.h

h263_get_modb

static int h263_get_modb(GetBitContext *gb, int pb_frame, int *cbpb)

Definition: ituh263dec.c:589

MpegEncContext::gb

GetBitContext gb

Definition: mpegvideo.h:509

CLOSE_READER

#define CLOSE_READER(name, gb)

Definition: get_bits.h:144

INIT_VLC_RL

#define INIT_VLC_RL(rl, static_size)

Definition: rl.h:63

avcodec.h

Libavcodec external API header.

check_marker

static int check_marker(GetBitContext *s, const char *msg)

Definition: get_bits.h:393

VLC

Definition: get_bits.h:63

MpegEncContext::mb_intra

int mb_intra

Definition: mpegvideo.h:357

internal.h

common internal API header

AV_PICTURE_TYPE_I

Intra.

Definition: avutil.h:267

AVCodecContext::err_recognition

int err_recognition

Error recognition; may misdetect some more or less valid parts as errors.

Definition: avcodec.h:2612

MB_TYPE_DIRECT2

#define MB_TYPE_DIRECT2

Definition: avcodec.h:902

MpegEncContext::mb_y

int mb_y

Definition: mpegvideo.h:355

MpegEncContext::mv_dir

int mv_dir

Definition: mpegvideo.h:328

IS_DIRECT

#define IS_DIRECT(a)

Definition: mpegutils.h:80

MpegEncContext::umvplus

int umvplus

== H263+ && unrestricted_mv

Definition: mpegvideo.h:440

ret

Definition: avfilter.c:974

MpegEncContext::mb_x

int mb_x

Definition: mpegvideo.h:355

Picture::motion_val

int16_t(*[2] motion_val)[2]

Definition: mpegvideo.h:97

MpegEncContext::width

int width

Definition: mpegvideo.h:169

mathops.h

GetBitContext::size_in_bits

int size_in_bits

Definition: get_bits.h:57

AV_CODEC_ID_RV10

Definition: avcodec.h:113

show_bits

static unsigned int show_bits(GetBitContext *s, int n)

Show 1-25 bits.

Definition: get_bits.h:287

MB_TYPE_L0L1

#define MB_TYPE_L0L1

Definition: avcodec.h:912

MpegEncContext::mb_width

int mb_width

Definition: mpegvideo.h:198

ff_mba_max

const uint16_t ff_mba_max[6]

Definition: h263data.h:267

get_vlc2

static av_always_inline int get_vlc2(GetBitContext *s, VLC_TYPE(*table)[2], int bits, int max_depth)

Parse a vlc code.

Definition: get_bits.h:555

MpegEncContext::block_last_index

int block_last_index[12]

last non zero coefficient in block

Definition: mpegvideo.h:155

int n

Definition: avisynth_c.h:547

MpegEncContext::pb_frame

int pb_frame

PB frame mode (0 = none, 1 = base, 2 = improved)

Definition: mpegvideo.h:175

MB_TYPE_ACPRED

#define MB_TYPE_ACPRED

Definition: avcodec.h:903

ff_h263_cbpy_vlc

VLC ff_h263_cbpy_vlc

Definition: ituh263dec.c:97

MB_TYPE_L1

#define MB_TYPE_L1

Definition: avcodec.h:911

ff_aic_dc_scale_table

const uint8_t ff_aic_dc_scale_table[32]

Definition: h263data.h:248

ff_h263_decode_mba

int ff_h263_decode_mba(MpegEncContext *s)

Definition: ituh263dec.c:136

ff_h263_inter_MCBPC_code

const uint8_t ff_h263_inter_MCBPC_code[28]

Definition: h263data.h:41

RLTable::rl_vlc

RL_VLC_ELEM * rl_vlc[32]

decoding only

Definition: rl.h:47

SHOW_UBITS

#define SHOW_UBITS(name, gb, num)

Definition: get_bits.h:206

h263p_decode_umotion

static int h263p_decode_umotion(MpegEncContext *s, int pred)

Definition: ituh263dec.c:289

MpegEncContext::block_index

int block_index[6]

index to current MB in block based arrays with edges

Definition: mpegvideo.h:360

pred

static const float pred[4]

Definition: siprdata.h:259

static const int8_t mv[256][2]

Definition: 4xm.c:77

MpegEncContext::ac_pred

int ac_pred

Definition: mpegvideo.h:154

MV_TYPE_16X16

#define MV_TYPE_16X16

1 vector for the whole mb

Definition: mpegvideo.h:333

MV_VLC_BITS

#define MV_VLC_BITS

Definition: ituh263dec.c:51

MV_DIR_BACKWARD

#define MV_DIR_BACKWARD

Definition: mpegvideo.h:330

MpegEncContext::loop_filter

int loop_filter

Definition: mpegvideo.h:445

MpegEncContext::last_non_b_time

int64_t last_non_b_time

Definition: mpegvideo.h:454

ff_dlog

#define ff_dlog(ctx,...)

Definition: internal.h:54

MpegEncContext::h263_flv

int h263_flv

use flv h263 header

Definition: mpegvideo.h:179

MpegEncContext::bdsp

BlockDSPContext bdsp

Definition: mpegvideo.h:295

ff_h263_static_rl_table_store

uint8_t ff_h263_static_rl_table_store[2][2][2 *MAX_RUN+MAX_LEVEL+3]

Definition: h263.c:43

AVCodecContext::debug

int debug

debug

Definition: avcodec.h:2565

MpegEncContext::intra_scantable

ScanTable intra_scantable

Definition: mpegvideo.h:160

MpegEncContext::height

int height

picture size. must be a multiple of 16

Definition: mpegvideo.h:169

IS_QUANT

#define IS_QUANT(a)

Definition: mpegutils.h:91

OPEN_READER

#define OPEN_READER(name, gb)

Definition: get_bits.h:133

MpegEncContext::ehc_mode

int ehc_mode

Definition: mpegvideo.h:437

ff_rl_init

av_cold int ff_rl_init(RLTable *rl, uint8_t static_store[2][2 *MAX_RUN+MAX_LEVEL+3])

Definition: rl.c:37

SLICE_END

#define SLICE_END

end marker found

Definition: mpegvideo.h:563

ff_h263_intra_MCBPC_vlc

VLC ff_h263_intra_MCBPC_vlc

Definition: ituh263dec.c:95

get_bits1

static unsigned int get_bits1(GetBitContext *s)

Definition: get_bits.h:304

height

BYTE int const BYTE int int int height

Definition: avisynth_c.h:676

skip_bits1

static void skip_bits1(GetBitContext *s)

Definition: get_bits.h:329

MpegEncContext::intra_h_scantable

ScanTable intra_h_scantable

Definition: mpegvideo.h:161

skip_bits

static void skip_bits(GetBitContext *s, int n)

Definition: get_bits.h:297

unary.h

AVRational

rational number numerator/denominator

Definition: rational.h:43

CBPC_B_VLC_BITS

#define CBPC_B_VLC_BITS

Definition: ituh263dec.c:53

MB_TYPE_16x16

#define MB_TYPE_16x16

Definition: avcodec.h:897

mv_vlc

static VLC mv_vlc

Definition: ituh263dec.c:98

ff_h263_resync

int ff_h263_resync(MpegEncContext *s)

Decode the group of blocks / video packet header.

Definition: ituh263dec.c:209

SKIP_CACHE

#define SKIP_CACHE(name, gb, num)

Definition: get_bits.h:175

MpegEncContext::f_code

int f_code

forward MV resolution

Definition: mpegvideo.h:307

ff_mpeg4_set_direct_mv

int ff_mpeg4_set_direct_mv(MpegEncContext *s, int mx, int my)

Definition: mpeg4video.c:117

ff_h263_decode_picture_header

int ff_h263_decode_picture_header(MpegEncContext *s)

Definition: ituh263dec.c:873

MV_DIR_FORWARD

#define MV_DIR_FORWARD

Definition: mpegvideo.h:329

MpegEncContext::pict_type

int pict_type

AV_PICTURE_TYPE_I, AV_PICTURE_TYPE_P, AV_PICTURE_TYPE_B, ...

Definition: mpegvideo.h:281

ff_h263_mbtype_b_tab

const uint8_t ff_h263_mbtype_b_tab[15][2]

Definition: h263data.h:60

sign_extend

static av_const int sign_extend(int val, unsigned bits)

Definition: mathops.h:139

h263_decode_dquant

static void h263_decode_dquant(MpegEncContext *s)

Definition: ituh263dec.c:407

MpegEncContext::h263_pred

int h263_pred

use mpeg4/h263 ac/dc predictions

Definition: mpegvideo.h:174

MpegEncContext::c_dc_scale_table

const uint8_t * c_dc_scale_table

qscale -> c_dc_scale table

Definition: mpegvideo.h:258

FF_ASPECT_EXTENDED

#define FF_ASPECT_EXTENDED

Definition: avcodec.h:1427

level

uint8_t level

Definition: svq3.c:150

limits.h

FF_DEBUG_PICT_INFO

#define FF_DEBUG_PICT_INFO

Definition: avcodec.h:2566

MpegEncContext::mv

int mv[2][4][2]

motion vectors for a macroblock first coordinate : 0 = forward 1 = backward second " : depend...

Definition: mpegvideo.h:343

MpegEncContext::b8_stride

int b8_stride

2*mb_width+1 used for some 8x8 block arrays to allow simple addressing

Definition: mpegvideo.h:200

MpegEncContext

MpegEncContext.

Definition: mpegvideo.h:150

MpegEncContext::avctx

struct AVCodecContext * avctx

Definition: mpegvideo.h:167

SHOW_SBITS

#define SHOW_SBITS(name, gb, num)

Definition: get_bits.h:207

MB_TYPE_CBP

#define MB_TYPE_CBP

Definition: avcodec.h:914

stride

GLint GLenum GLboolean GLsizei stride

Definition: opengl_enc.c:105

GetBitContext

Definition: get_bits.h:54

internal.h

common internal api header.

MpegEncContext::mb_stride

int mb_stride

mb_width+1 used for some arrays to allow simple addressing of left & top MBs without sig11 ...

Definition: mpegvideo.h:199

ff_h263_pred_acdc

void ff_h263_pred_acdc(MpegEncContext *s, int16_t *block, int n)

Definition: h263.c:226

TEX_VLC_BITS

#define TEX_VLC_BITS

Definition: dv.h:93

ff_h263_chroma_qscale_table

const uint8_t ff_h263_chroma_qscale_table[32]

Definition: h263data.h:262

get_unary

static int get_unary(GetBitContext *gb, int stop, int len)

Get unary code of limited length.

Definition: unary.h:33

static double c[64]

Definition: vsrc_mptestsrc.c:87

MB_TYPE_8x8

#define MB_TYPE_8x8

Definition: avcodec.h:900

ff_rv_decode_dc

int ff_rv_decode_dc(MpegEncContext *s, int n)

Definition: rv10.c:196

AV_PICTURE_TYPE_B

Bi-dir predicted.

Definition: avutil.h:269

AV_EF_BITSTREAM

#define AV_EF_BITSTREAM

detect bitstream specification deviations

Definition: avcodec.h:2621

mpegvideodata.h

AVRational::den

int den

denominator

Definition: rational.h:45

MpegEncContext::chroma_qscale_table

const uint8_t * chroma_qscale_table

qscale -> chroma_qscale (h263)

Definition: mpegvideo.h:259

IS_INTRA

#define IS_INTRA(x, y)

AVCodecContext::priv_data

void * priv_data

Definition: avcodec.h:1283

diff

static av_always_inline int diff(const uint32_t a, const uint32_t b)

Definition: vf_palettegen.c:133

float re

Definition: fft-test.c:73

cbpc_b_vlc

static VLC cbpc_b_vlc

Definition: ituh263dec.c:100

MpegEncContext::mv_type

int mv_type

Definition: mpegvideo.h:332

ff_h263_show_pict_info

void ff_h263_show_pict_info(MpegEncContext *s)

Print picture info if FF_DEBUG_PICT_INFO is set.

Definition: ituh263dec.c:73

MpegEncContext::block

int16_t(* block)[64]

points to one of the following blocks

Definition: mpegvideo.h:558

VLC::table

VLC_TYPE(* table)[2]

code, bits

Definition: get_bits.h:65

AV_EF_COMPLIANT

#define AV_EF_COMPLIANT

consider all spec non compliances as errors

Definition: avcodec.h:2627

align_get_bits

static const uint8_t * align_get_bits(GetBitContext *s)

Definition: get_bits.h:449

MpegEncContext::custom_pcf

int custom_pcf

Definition: mpegvideo.h:446

MpegEncContext::chroma_qscale

int chroma_qscale

chroma QP

Definition: mpegvideo.h:274

AVCodecContext::frame_number

int frame_number

Frame counter, set by libavcodec.

Definition: avcodec.h:2016

preview_obmc

static void preview_obmc(MpegEncContext *s)

read the next MVs for OBMC.

Definition: ituh263dec.c:315

Picture::mb_type

uint32_t * mb_type

types and macros are defined in mpegutils.h

Definition: mpegvideo.h:100

LOCAL_ALIGNED_16

#define LOCAL_ALIGNED_16(t, v,...)

Definition: internal.h:120

MpegEncContext::rv10_version

int rv10_version

RV10 version: 0 or 3.

Definition: mpegvideo.h:483

skip_1stop_8data_bits

static int skip_1stop_8data_bits(GetBitContext *gb)

Definition: get_bits.h:593

MpegEncContext::h263_long_vectors

int h263_long_vectors

use horrible h263v1 long vector mode

Definition: mpegvideo.h:293

stride

#define stride

MV_TYPE_8X8

#define MV_TYPE_8X8

4 vectors (h263, mpeg4 4MV)

Definition: mpegvideo.h:334

MpegEncContext::h263_aic_dir

int h263_aic_dir

AIC direction: 0 = left, 1 = top.

Definition: mpegvideo.h:441

AV_RL32

uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32

Definition: bytestream.h:85

ff_h263_decode_mb

int ff_h263_decode_mb(MpegEncContext *s, int16_t block[6][64])

Definition: ituh263dec.c:607

MB_TYPE_L0

#define MB_TYPE_L0

Definition: avcodec.h:910

AV_PICTURE_TYPE_P

Predicted.

Definition: avutil.h:268

INTRA_MCBPC_VLC_BITS

#define INTRA_MCBPC_VLC_BITS

Definition: h263.h:38

MpegEncContext::pb_time

uint16_t pb_time

time distance between the last b and p,s,i frame

Definition: mpegvideo.h:456

width

static int width

Definition: demuxing_decoding.c:39

block

static int16_t block[64]

Definition: dct-test.c:110

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