FFmpeg: libavcodec/dvbsubdec.c Source File

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libavcodec

dvbsubdec.c

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1 /*

2 * DVB subtitle decoding

4 *

5 * This file is part of FFmpeg.

6 *

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

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

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

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

11 *

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

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

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

15 * Lesser General Public License for more details.

16 *

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

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

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

20 */

21 #include "avcodec.h"

22 #include "dsputil.h"

23 #include "get_bits.h"

24 #include "bytestream.h"

25 #include "libavutil/colorspace.h"

27 #define DVBSUB_PAGE_SEGMENT 0x10

28 #define DVBSUB_REGION_SEGMENT 0x11

29 #define DVBSUB_CLUT_SEGMENT 0x12

30 #define DVBSUB_OBJECT_SEGMENT 0x13

31 #define DVBSUB_DISPLAYDEFINITION_SEGMENT 0x14

32 #define DVBSUB_DISPLAY_SEGMENT 0x80

34 #define cm (ff_cropTbl + MAX_NEG_CROP)

36 #ifdef DEBUG

37 #undef fprintf

38 #undef perror

39 #if 0

40 static void png_save(const char *filename, uint8_t *bitmap, int w, int h,

41 uint32_t *rgba_palette)

42 {

43 int x, y, v;

44 FILE *f;

45 char fname[40], fname2[40];

46 char command[1024];

48 snprintf(fname, 40, "%s.ppm", filename);

50 f = fopen(fname, "w");

51 if (!f) {

52 perror(fname);

53 return;

54 }

55 fprintf(f, "P6\n"

56 "%d %d\n"

57 "%d\n",

58 w, h, 255);

59 for(y = 0; y < h; y++) {

60 for(x = 0; x < w; x++) {

61 v = rgba_palette[bitmap[y * w + x]];

62 putc((v >> 16) & 0xff, f);

63 putc((v >> 8) & 0xff, f);

64 putc((v >> 0) & 0xff, f);

65 }

66 }

67 fclose(f);

70 snprintf(fname2, 40, "%s-a.pgm", filename);

72 f = fopen(fname2, "w");

73 if (!f) {

74 perror(fname2);

75 return;

76 }

77 fprintf(f, "P5\n"

78 "%d %d\n"

79 "%d\n",

80 w, h, 255);

81 for(y = 0; y < h; y++) {

82 for(x = 0; x < w; x++) {

83 v = rgba_palette[bitmap[y * w + x]];

84 putc((v >> 24) & 0xff, f);

85 }

86 }

87 fclose(f);

89 snprintf(command, 1024, "pnmtopng -alpha %s %s > %s.png 2> /dev/null", fname2, fname, filename);

90 system(command);

92 snprintf(command, 1024, "rm %s %s", fname, fname2);

93 system(command);

94 }

95 #endif

97 static void png_save2(const char *filename, uint32_t *bitmap, int w, int h)

98 {

99 int x, y, v;

100 FILE *f;

101 char fname[40], fname2[40];

102 char command[1024];

103

104 snprintf(fname, sizeof(fname), "%s.ppm", filename);

105

106 f = fopen(fname, "w");

107 if (!f) {

108 perror(fname);

109 return;

110 }

111 fprintf(f, "P6\n"

112 "%d %d\n"

113 "%d\n",

114 w, h, 255);

115 for(y = 0; y < h; y++) {

116 for(x = 0; x < w; x++) {

117 v = bitmap[y * w + x];

118 putc((v >> 16) & 0xff, f);

119 putc((v >> 8) & 0xff, f);

120 putc((v >> 0) & 0xff, f);

121 }

122 }

123 fclose(f);

124

125

126 snprintf(fname2, sizeof(fname2), "%s-a.pgm", filename);

127

128 f = fopen(fname2, "w");

129 if (!f) {

130 perror(fname2);

131 return;

132 }

133 fprintf(f, "P5\n"

134 "%d %d\n"

135 "%d\n",

136 w, h, 255);

137 for(y = 0; y < h; y++) {

138 for(x = 0; x < w; x++) {

139 v = bitmap[y * w + x];

140 putc((v >> 24) & 0xff, f);

141 }

142 }

143 fclose(f);

144

145 snprintf(command, sizeof(command), "pnmtopng -alpha %s %s > %s.png 2> /dev/null", fname2, fname, filename);

146 system(command);

147

148 snprintf(command, sizeof(command), "rm %s %s", fname, fname2);

149 system(command);

150 }

151 #endif

152

153 #define RGBA(r,g,b,a) (((unsigned)(a) << 24) | ((r) << 16) | ((g) << 8) | (b))

154

155 typedef struct DVBSubCLUT {

156 int id;

157 int version;

158

159 uint32_t clut4[4];

160 uint32_t clut16[16];

161 uint32_t clut256[256];

162

163 struct DVBSubCLUT *next;

164 } DVBSubCLUT;

165

166 static DVBSubCLUT default_clut;

167

168 typedef struct DVBSubObjectDisplay {

169 int object_id;

170 int region_id;

171

172 int x_pos;

173 int y_pos;

174

175 int fgcolor;

176 int bgcolor;

177

178 struct DVBSubObjectDisplay *region_list_next;

179 struct DVBSubObjectDisplay *object_list_next;

180 } DVBSubObjectDisplay;

181

182 typedef struct DVBSubObject {

183 int id;

184 int version;

185

186 int type;

187

188 DVBSubObjectDisplay *display_list;

189

190 struct DVBSubObject *next;

191 } DVBSubObject;

192

193 typedef struct DVBSubRegionDisplay {

194 int region_id;

195

196 int x_pos;

197 int y_pos;

198

199 struct DVBSubRegionDisplay *next;

200 } DVBSubRegionDisplay;

201

202 typedef struct DVBSubRegion {

203 int id;

204 int version;

205

206 int width;

207 int height;

208 int depth;

209

210 int clut;

211 int bgcolor;

212

213 uint8_t *pbuf;

214 int buf_size;

215 int dirty;

216

217 DVBSubObjectDisplay *display_list;

218

219 struct DVBSubRegion *next;

220 } DVBSubRegion;

221

222 typedef struct DVBSubDisplayDefinition {

223 int version;

224

225 int x;

226 int y;

227 int width;

228 int height;

229 } DVBSubDisplayDefinition;

230

231 typedef struct DVBSubContext {

232 int composition_id;

233 int ancillary_id;

234

235 int version;

236 int time_out;

237 DVBSubRegion *region_list;

238 DVBSubCLUT *clut_list;

239 DVBSubObject *object_list;

240

241 int display_list_size;

242 DVBSubRegionDisplay *display_list;

243 DVBSubDisplayDefinition *display_definition;

244 } DVBSubContext;

245

246

247 static DVBSubObject* get_object(DVBSubContext *ctx, int object_id)

248 {

249 DVBSubObject *ptr = ctx->object_list;

250

251 while (ptr && ptr->id != object_id) {

252 ptr = ptr->next;

253 }

254

255 return ptr;

256 }

257

258 static DVBSubCLUT* get_clut(DVBSubContext *ctx, int clut_id)

259 {

260 DVBSubCLUT *ptr = ctx->clut_list;

261

262 while (ptr && ptr->id != clut_id) {

263 ptr = ptr->next;

264 }

265

266 return ptr;

267 }

268

269 static DVBSubRegion* get_region(DVBSubContext *ctx, int region_id)

270 {

271 DVBSubRegion *ptr = ctx->region_list;

272

273 while (ptr && ptr->id != region_id) {

274 ptr = ptr->next;

275 }

276

277 return ptr;

278 }

279

280 static void delete_region_display_list(DVBSubContext *ctx, DVBSubRegion *region)

281 {

282 DVBSubObject *object, *obj2, **obj2_ptr;

283 DVBSubObjectDisplay *display, *obj_disp, **obj_disp_ptr;

284

285 while (region->display_list) {

286 display = region->display_list;

287

288 object = get_object(ctx, display->object_id);

289

290 if (object) {

291 obj_disp_ptr = &object->display_list;

292 obj_disp = *obj_disp_ptr;

293

294 while (obj_disp && obj_disp != display) {

295 obj_disp_ptr = &obj_disp->object_list_next;

296 obj_disp = *obj_disp_ptr;

297 }

298

299 if (obj_disp) {

300 *obj_disp_ptr = obj_disp->object_list_next;

301

302 if (!object->display_list) {

303 obj2_ptr = &ctx->object_list;

304 obj2 = *obj2_ptr;

305

306 while (obj2 != object) {

307 assert(obj2);

308 obj2_ptr = &obj2->next;

309 obj2 = *obj2_ptr;

310 }

311

312 *obj2_ptr = obj2->next;

313

314 av_free(obj2);

315 }

316 }

317 }

318

319 region->display_list = display->region_list_next;

320

321 av_free(display);

322 }

323

324 }

325

326 static void delete_cluts(DVBSubContext *ctx)

327 {

328 DVBSubCLUT *clut;

329

330 while (ctx->clut_list) {

331 clut = ctx->clut_list;

332

333 ctx->clut_list = clut->next;

334

335 av_free(clut);

336 }

337 }

338

339 static void delete_objects(DVBSubContext *ctx)

340 {

341 DVBSubObject *object;

342

343 while (ctx->object_list) {

344 object = ctx->object_list;

345

346 ctx->object_list = object->next;

347

348 av_free(object);

349 }

350 }

351

352 static void delete_regions(DVBSubContext *ctx)

353 {

354 DVBSubRegion *region;

355

356 while (ctx->region_list) {

357 region = ctx->region_list;

358

359 ctx->region_list = region->next;

360

361 delete_region_display_list(ctx, region);

362

363 av_free(region->pbuf);

364 av_free(region);

365 }

366 }

367

368 static av_cold int dvbsub_init_decoder(AVCodecContext *avctx)

369 {

370 int i, r, g, b, a = 0;

371 DVBSubContext *ctx = avctx->priv_data;

372

373 if (!avctx->extradata || avctx->extradata_size != 4) {

374 av_log(avctx, AV_LOG_WARNING, "Invalid extradata, subtitle streams may be combined!\n");

375 ctx->composition_id = -1;

376 ctx->ancillary_id = -1;

377 } else {

378 ctx->composition_id = AV_RB16(avctx->extradata);

379 ctx->ancillary_id = AV_RB16(avctx->extradata + 2);

380 }

381

382 ctx->version = -1;

383

384 default_clut.id = -1;

385 default_clut.next = NULL;

386

387 default_clut.clut4[0] = RGBA( 0, 0, 0, 0);

388 default_clut.clut4[1] = RGBA(255, 255, 255, 255);

389 default_clut.clut4[2] = RGBA( 0, 0, 0, 255);

390 default_clut.clut4[3] = RGBA(127, 127, 127, 255);

391

392 default_clut.clut16[0] = RGBA( 0, 0, 0, 0);

393 for (i = 1; i < 16; i++) {

394 if (i < 8) {

395 r = (i & 1) ? 255 : 0;

396 g = (i & 2) ? 255 : 0;

397 b = (i & 4) ? 255 : 0;

398 } else {

399 r = (i & 1) ? 127 : 0;

400 g = (i & 2) ? 127 : 0;

401 b = (i & 4) ? 127 : 0;

402 }

403 default_clut.clut16[i] = RGBA(r, g, b, 255);

404 }

405

406 default_clut.clut256[0] = RGBA( 0, 0, 0, 0);

407 for (i = 1; i < 256; i++) {

408 if (i < 8) {

409 r = (i & 1) ? 255 : 0;

410 g = (i & 2) ? 255 : 0;

411 b = (i & 4) ? 255 : 0;

412 a = 63;

413 } else {

414 switch (i & 0x88) {

415 case 0x00:

416 r = ((i & 1) ? 85 : 0) + ((i & 0x10) ? 170 : 0);

417 g = ((i & 2) ? 85 : 0) + ((i & 0x20) ? 170 : 0);

418 b = ((i & 4) ? 85 : 0) + ((i & 0x40) ? 170 : 0);

419 a = 255;

420 break;

421 case 0x08:

422 r = ((i & 1) ? 85 : 0) + ((i & 0x10) ? 170 : 0);

423 g = ((i & 2) ? 85 : 0) + ((i & 0x20) ? 170 : 0);

424 b = ((i & 4) ? 85 : 0) + ((i & 0x40) ? 170 : 0);

425 a = 127;

426 break;

427 case 0x80:

428 r = 127 + ((i & 1) ? 43 : 0) + ((i & 0x10) ? 85 : 0);

429 g = 127 + ((i & 2) ? 43 : 0) + ((i & 0x20) ? 85 : 0);

430 b = 127 + ((i & 4) ? 43 : 0) + ((i & 0x40) ? 85 : 0);

431 a = 255;

432 break;

433 case 0x88:

434 r = ((i & 1) ? 43 : 0) + ((i & 0x10) ? 85 : 0);

435 g = ((i & 2) ? 43 : 0) + ((i & 0x20) ? 85 : 0);

436 b = ((i & 4) ? 43 : 0) + ((i & 0x40) ? 85 : 0);

437 a = 255;

438 break;

439 }

440 }

441 default_clut.clut256[i] = RGBA(r, g, b, a);

442 }

443

444 return 0;

445 }

446

447 static av_cold int dvbsub_close_decoder(AVCodecContext *avctx)

448 {

449 DVBSubContext *ctx = avctx->priv_data;

450 DVBSubRegionDisplay *display;

451

452 delete_regions(ctx);

453

454 delete_objects(ctx);

455

456 delete_cluts(ctx);

457

458 av_freep(&ctx->display_definition);

459

460 while (ctx->display_list) {

461 display = ctx->display_list;

462 ctx->display_list = display->next;

463

464 av_free(display);

465 }

466

467 return 0;

468 }

469

470 static int dvbsub_read_2bit_string(uint8_t *destbuf, int dbuf_len,

471 const uint8_t **srcbuf, int buf_size,

472 int non_mod, uint8_t *map_table, int x_pos)

473 {

474 GetBitContext gb;

475

476 int bits;

477 int run_length;

478 int pixels_read = x_pos;

479

480 init_get_bits(&gb, *srcbuf, buf_size << 3);

481

482 destbuf += x_pos;

483

484 while (get_bits_count(&gb) < buf_size << 3 && pixels_read < dbuf_len) {

485 bits = get_bits(&gb, 2);

486

487 if (bits) {

488 if (non_mod != 1 || bits != 1) {

489 if (map_table)

490 *destbuf++ = map_table[bits];

491 else

492 *destbuf++ = bits;

493 }

494 pixels_read++;

495 } else {

496 bits = get_bits1(&gb);

497 if (bits == 1) {

498 run_length = get_bits(&gb, 3) + 3;

499 bits = get_bits(&gb, 2);

500

501 if (non_mod == 1 && bits == 1)

502 pixels_read += run_length;

503 else {

504 if (map_table)

505 bits = map_table[bits];

506 while (run_length-- > 0 && pixels_read < dbuf_len) {

507 *destbuf++ = bits;

508 pixels_read++;

509 }

510 }

511 } else {

512 bits = get_bits1(&gb);

513 if (bits == 0) {

514 bits = get_bits(&gb, 2);

515 if (bits == 2) {

516 run_length = get_bits(&gb, 4) + 12;

517 bits = get_bits(&gb, 2);

518

519 if (non_mod == 1 && bits == 1)

520 pixels_read += run_length;

521 else {

522 if (map_table)

523 bits = map_table[bits];

524 while (run_length-- > 0 && pixels_read < dbuf_len) {

525 *destbuf++ = bits;

526 pixels_read++;

527 }

528 }

529 } else if (bits == 3) {

530 run_length = get_bits(&gb, 8) + 29;

531 bits = get_bits(&gb, 2);

532

533 if (non_mod == 1 && bits == 1)

534 pixels_read += run_length;

535 else {

536 if (map_table)

537 bits = map_table[bits];

538 while (run_length-- > 0 && pixels_read < dbuf_len) {

539 *destbuf++ = bits;

540 pixels_read++;

541 }

542 }

543 } else if (bits == 1) {

544 if (map_table)

545 bits = map_table[0];

546 else

547 bits = 0;

548 run_length = 2;

549 while (run_length-- > 0 && pixels_read < dbuf_len) {

550 *destbuf++ = bits;

551 pixels_read++;

552 }

553 } else {

554 (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;

555 return pixels_read;

556 }

557 } else {

558 if (map_table)

559 bits = map_table[0];

560 else

561 bits = 0;

562 *destbuf++ = bits;

563 pixels_read++;

564 }

565 }

566 }

567 }

568

569 if (get_bits(&gb, 6))

570 av_log(0, AV_LOG_ERROR, "DVBSub error: line overflow\n");

571

572 (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;

573

574 return pixels_read;

575 }

576

577 static int dvbsub_read_4bit_string(uint8_t *destbuf, int dbuf_len,

578 const uint8_t **srcbuf, int buf_size,

579 int non_mod, uint8_t *map_table, int x_pos)

580 {

581 GetBitContext gb;

582

583 int bits;

584 int run_length;

585 int pixels_read = x_pos;

586

587 init_get_bits(&gb, *srcbuf, buf_size << 3);

588

589 destbuf += x_pos;

590

591 while (get_bits_count(&gb) < buf_size << 3 && pixels_read < dbuf_len) {

592 bits = get_bits(&gb, 4);

593

594 if (bits) {

595 if (non_mod != 1 || bits != 1) {

596 if (map_table)

597 *destbuf++ = map_table[bits];

598 else

599 *destbuf++ = bits;

600 }

601 pixels_read++;

602 } else {

603 bits = get_bits1(&gb);

604 if (bits == 0) {

605 run_length = get_bits(&gb, 3);

606

607 if (run_length == 0) {

608 (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;

609 return pixels_read;

610 }

611

612 run_length += 2;

613

614 if (map_table)

615 bits = map_table[0];

616 else

617 bits = 0;

618

619 while (run_length-- > 0 && pixels_read < dbuf_len) {

620 *destbuf++ = bits;

621 pixels_read++;

622 }

623 } else {

624 bits = get_bits1(&gb);

625 if (bits == 0) {

626 run_length = get_bits(&gb, 2) + 4;

627 bits = get_bits(&gb, 4);

628

629 if (non_mod == 1 && bits == 1)

630 pixels_read += run_length;

631 else {

632 if (map_table)

633 bits = map_table[bits];

634 while (run_length-- > 0 && pixels_read < dbuf_len) {

635 *destbuf++ = bits;

636 pixels_read++;

637 }

638 }

639 } else {

640 bits = get_bits(&gb, 2);

641 if (bits == 2) {

642 run_length = get_bits(&gb, 4) + 9;

643 bits = get_bits(&gb, 4);

644

645 if (non_mod == 1 && bits == 1)

646 pixels_read += run_length;

647 else {

648 if (map_table)

649 bits = map_table[bits];

650 while (run_length-- > 0 && pixels_read < dbuf_len) {

651 *destbuf++ = bits;

652 pixels_read++;

653 }

654 }

655 } else if (bits == 3) {

656 run_length = get_bits(&gb, 8) + 25;

657 bits = get_bits(&gb, 4);

658

659 if (non_mod == 1 && bits == 1)

660 pixels_read += run_length;

661 else {

662 if (map_table)

663 bits = map_table[bits];

664 while (run_length-- > 0 && pixels_read < dbuf_len) {

665 *destbuf++ = bits;

666 pixels_read++;

667 }

668 }

669 } else if (bits == 1) {

670 if (map_table)

671 bits = map_table[0];

672 else

673 bits = 0;

674 run_length = 2;

675 while (run_length-- > 0 && pixels_read < dbuf_len) {

676 *destbuf++ = bits;

677 pixels_read++;

678 }

679 } else {

680 if (map_table)

681 bits = map_table[0];

682 else

683 bits = 0;

684 *destbuf++ = bits;

685 pixels_read ++;

686 }

687 }

688 }

689 }

690 }

691

692 if (get_bits(&gb, 8))

693 av_log(0, AV_LOG_ERROR, "DVBSub error: line overflow\n");

694

695 (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;

696

697 return pixels_read;

698 }

699

700 static int dvbsub_read_8bit_string(uint8_t *destbuf, int dbuf_len,

701 const uint8_t **srcbuf, int buf_size,

702 int non_mod, uint8_t *map_table, int x_pos)

703 {

704 const uint8_t *sbuf_end = (*srcbuf) + buf_size;

705 int bits;

706 int run_length;

707 int pixels_read = x_pos;

708

709 destbuf += x_pos;

710

711 while (*srcbuf < sbuf_end && pixels_read < dbuf_len) {

712 bits = *(*srcbuf)++;

713

714 if (bits) {

715 if (non_mod != 1 || bits != 1) {

716 if (map_table)

717 *destbuf++ = map_table[bits];

718 else

719 *destbuf++ = bits;

720 }

721 pixels_read++;

722 } else {

723 bits = *(*srcbuf)++;

724 run_length = bits & 0x7f;

725 if ((bits & 0x80) == 0) {

726 if (run_length == 0) {

727 return pixels_read;

728 }

729

730 if (map_table)

731 bits = map_table[0];

732 else

733 bits = 0;

734 while (run_length-- > 0 && pixels_read < dbuf_len) {

735 *destbuf++ = bits;

736 pixels_read++;

737 }

738 } else {

739 bits = *(*srcbuf)++;

740

741 if (non_mod == 1 && bits == 1)

742 pixels_read += run_length;

743 if (map_table)

744 bits = map_table[bits];

745 else while (run_length-- > 0 && pixels_read < dbuf_len) {

746 *destbuf++ = bits;

747 pixels_read++;

748 }

749 }

750 }

751 }

752

753 if (*(*srcbuf)++)

754 av_log(0, AV_LOG_ERROR, "DVBSub error: line overflow\n");

755

756 return pixels_read;

757 }

758

759

760

761 static void dvbsub_parse_pixel_data_block(AVCodecContext *avctx, DVBSubObjectDisplay *display,

762 const uint8_t *buf, int buf_size, int top_bottom, int non_mod)

763 {

764 DVBSubContext *ctx = avctx->priv_data;

765

766 DVBSubRegion *region = get_region(ctx, display->region_id);

767 const uint8_t *buf_end = buf + buf_size;

768 uint8_t *pbuf;

769 int x_pos, y_pos;

770 int i;

771

772 uint8_t map2to4[] = { 0x0, 0x7, 0x8, 0xf};

773 uint8_t map2to8[] = {0x00, 0x77, 0x88, 0xff};

774 uint8_t map4to8[] = {0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77,

775 0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff};

776 uint8_t *map_table;

777

778 #if 0

779 av_dlog(avctx, "DVB pixel block size %d, %s field:\n", buf_size,

780 top_bottom ? "bottom" : "top");

781

782 for (i = 0; i < buf_size; i++) {

783 if (i % 16 == 0)

784 av_dlog(avctx, "0x%8p: ", buf+i);

785

786 av_dlog(avctx, "%02x ", buf[i]);

787 if (i % 16 == 15)

788 av_dlog(avctx, "\n");

789 }

790

791 if (i % 16)

792 av_dlog(avctx, "\n");

793 #endif

794

795 if (region == 0)

796 return;

797

798 pbuf = region->pbuf;

799 region->dirty = 1;

800

801 x_pos = display->x_pos;

802 y_pos = display->y_pos;

803

804 y_pos += top_bottom;

805

806 while (buf < buf_end) {

807 if ((*buf!=0xf0 && x_pos >= region->width) || y_pos >= region->height) {

808 av_log(avctx, AV_LOG_ERROR, "Invalid object location! %d-%d %d-%d %02x\n", x_pos, region->width, y_pos, region->height, *buf);

809 return;

810 }

811

812 switch (*buf++) {

813 case 0x10:

814 if (region->depth == 8)

815 map_table = map2to8;

816 else if (region->depth == 4)

817 map_table = map2to4;

818 else

819 map_table = NULL;

820

821 x_pos = dvbsub_read_2bit_string(pbuf + (y_pos * region->width),

822 region->width, &buf, buf_end - buf,

823 non_mod, map_table, x_pos);

824 break;

825 case 0x11:

826 if (region->depth < 4) {

827 av_log(avctx, AV_LOG_ERROR, "4-bit pixel string in %d-bit region!\n", region->depth);

828 return;

829 }

830

831 if (region->depth == 8)

832 map_table = map4to8;

833 else

834 map_table = NULL;

835

836 x_pos = dvbsub_read_4bit_string(pbuf + (y_pos * region->width),

837 region->width, &buf, buf_end - buf,

838 non_mod, map_table, x_pos);

839 break;

840 case 0x12:

841 if (region->depth < 8) {

842 av_log(avctx, AV_LOG_ERROR, "8-bit pixel string in %d-bit region!\n", region->depth);

843 return;

844 }

845

846 x_pos = dvbsub_read_8bit_string(pbuf + (y_pos * region->width),

847 region->width, &buf, buf_end - buf,

848 non_mod, NULL, x_pos);

849 break;

850

851 case 0x20:

852 map2to4[0] = (*buf) >> 4;

853 map2to4[1] = (*buf++) & 0xf;

854 map2to4[2] = (*buf) >> 4;

855 map2to4[3] = (*buf++) & 0xf;

856 break;

857 case 0x21:

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

859 map2to8[i] = *buf++;

860 break;

861 case 0x22:

862 for (i = 0; i < 16; i++)

863 map4to8[i] = *buf++;

864 break;

865

866 case 0xf0:

867 x_pos = display->x_pos;

868 y_pos += 2;

869 break;

870 default:

871 av_log(avctx, AV_LOG_INFO, "Unknown/unsupported pixel block 0x%x\n", *(buf-1));

872 }

873 }

874

875 }

876

877 static void dvbsub_parse_object_segment(AVCodecContext *avctx,

878 const uint8_t *buf, int buf_size)

879 {

880 DVBSubContext *ctx = avctx->priv_data;

881

882 const uint8_t *buf_end = buf + buf_size;

883 int object_id;

884 DVBSubObject *object;

885 DVBSubObjectDisplay *display;

886 int top_field_len, bottom_field_len;

887

888 int coding_method, non_modifying_color;

889

890 object_id = AV_RB16(buf);

891 buf += 2;

892

893 object = get_object(ctx, object_id);

894

895 if (!object)

896 return;

897

898 coding_method = ((*buf) >> 2) & 3;

899 non_modifying_color = ((*buf++) >> 1) & 1;

900

901 if (coding_method == 0) {

902 top_field_len = AV_RB16(buf);

903 buf += 2;

904 bottom_field_len = AV_RB16(buf);

905 buf += 2;

906

907 if (buf + top_field_len + bottom_field_len > buf_end) {

908 av_log(avctx, AV_LOG_ERROR, "Field data size too large\n");

909 return;

910 }

911

912 for (display = object->display_list; display; display = display->object_list_next) {

913 const uint8_t *block = buf;

914 int bfl = bottom_field_len;

915

916 dvbsub_parse_pixel_data_block(avctx, display, block, top_field_len, 0,

917 non_modifying_color);

918

919 if (bottom_field_len > 0)

920 block = buf + top_field_len;

921 else

922 bfl = top_field_len;

923

924 dvbsub_parse_pixel_data_block(avctx, display, block, bfl, 1,

925 non_modifying_color);

926 }

927

928 /* } else if (coding_method == 1) {*/

929

930 } else {

931 av_log(avctx, AV_LOG_ERROR, "Unknown object coding %d\n", coding_method);

932 }

933

934 }

935

936 static void dvbsub_parse_clut_segment(AVCodecContext *avctx,

937 const uint8_t *buf, int buf_size)

938 {

939 DVBSubContext *ctx = avctx->priv_data;

940

941 const uint8_t *buf_end = buf + buf_size;

942 int i, clut_id;

943 int version;

944 DVBSubCLUT *clut;

945 int entry_id, depth , full_range;

946 int y, cr, cb, alpha;

947 int r, g, b, r_add, g_add, b_add;

948

949 av_dlog(avctx, "DVB clut packet:\n");

950

951 for (i=0; i < buf_size; i++) {

952 av_dlog(avctx, "%02x ", buf[i]);

953 if (i % 16 == 15)

954 av_dlog(avctx, "\n");

955 }

956

957 if (i % 16)

958 av_dlog(avctx, "\n");

959

960 clut_id = *buf++;

961 version = ((*buf)>>4)&15;

962 buf += 1;

963

964 clut = get_clut(ctx, clut_id);

965

966 if (!clut) {

967 clut = av_malloc(sizeof(DVBSubCLUT));

968

969 memcpy(clut, &default_clut, sizeof(DVBSubCLUT));

970

971 clut->id = clut_id;

972 clut->version = -1;

973

974 clut->next = ctx->clut_list;

975 ctx->clut_list = clut;

976 }

977

978 if (clut->version != version) {

979

980 clut->version = version;

981

982 while (buf + 4 < buf_end) {

983 entry_id = *buf++;

984

985 depth = (*buf) & 0xe0;

986

987 if (depth == 0) {

988 av_log(avctx, AV_LOG_ERROR, "Invalid clut depth 0x%x!\n", *buf);

989 return;

990 }

991

992 full_range = (*buf++) & 1;

993

994 if (full_range) {

995 y = *buf++;

996 cr = *buf++;

997 cb = *buf++;

998 alpha = *buf++;

999 } else {

1000 y = buf[0] & 0xfc;

1001 cr = (((buf[0] & 3) << 2) | ((buf[1] >> 6) & 3)) << 4;

1002 cb = (buf[1] << 2) & 0xf0;

1003 alpha = (buf[1] << 6) & 0xc0;

1004

1005 buf += 2;

1006 }

1007

1008 if (y == 0)

1009 alpha = 0xff;

1010

1011 YUV_TO_RGB1_CCIR(cb, cr);

1012 YUV_TO_RGB2_CCIR(r, g, b, y);

1013

1014 av_dlog(avctx, "clut %d := (%d,%d,%d,%d)\n", entry_id, r, g, b, alpha);

1015

1016 if (depth & 0x80)

1017 clut->clut4[entry_id] = RGBA(r,g,b,255 - alpha);

1018 if (depth & 0x40)

1019 clut->clut16[entry_id] = RGBA(r,g,b,255 - alpha);

1020 if (depth & 0x20)

1021 clut->clut256[entry_id] = RGBA(r,g,b,255 - alpha);

1022 }

1023 }

1024 }

1025

1026

1027 static void dvbsub_parse_region_segment(AVCodecContext *avctx,

1028 const uint8_t *buf, int buf_size)

1029 {

1030 DVBSubContext *ctx = avctx->priv_data;

1031

1032 const uint8_t *buf_end = buf + buf_size;

1033 int region_id, object_id;

1034 int av_unused version;

1035 DVBSubRegion *region;

1036 DVBSubObject *object;

1037 DVBSubObjectDisplay *display;

1038 int fill;

1039

1040 if (buf_size < 10)

1041 return;

1042

1043 region_id = *buf++;

1044

1045 region = get_region(ctx, region_id);

1046

1047 if (!region) {

1048 region = av_mallocz(sizeof(DVBSubRegion));

1049

1050 region->id = region_id;

1051 region->version = -1;

1052

1053 region->next = ctx->region_list;

1054 ctx->region_list = region;

1055 }

1056

1057 version = ((*buf)>>4) & 15;

1058 fill = ((*buf++) >> 3) & 1;

1059

1060 region->width = AV_RB16(buf);

1061 buf += 2;

1062 region->height = AV_RB16(buf);

1063 buf += 2;

1064

1065 if (region->width * region->height != region->buf_size) {

1066 av_free(region->pbuf);

1067

1068 region->buf_size = region->width * region->height;

1069

1070 region->pbuf = av_malloc(region->buf_size);

1071

1072 fill = 1;

1073 region->dirty = 0;

1074 }

1075

1076 region->depth = 1 << (((*buf++) >> 2) & 7);

1077 if(region->depth<2 || region->depth>8){

1078 av_log(avctx, AV_LOG_ERROR, "region depth %d is invalid\n", region->depth);

1079 region->depth= 4;

1080 }

1081 region->clut = *buf++;

1082

1083 if (region->depth == 8) {

1084 region->bgcolor = *buf++;

1085 buf += 1;

1086 } else {

1087 buf += 1;

1088

1089 if (region->depth == 4)

1090 region->bgcolor = (((*buf++) >> 4) & 15);

1091 else

1092 region->bgcolor = (((*buf++) >> 2) & 3);

1093 }

1094

1095 av_dlog(avctx, "Region %d, (%dx%d)\n", region_id, region->width, region->height);

1096

1097 if (fill) {

1098 memset(region->pbuf, region->bgcolor, region->buf_size);

1099 av_dlog(avctx, "Fill region (%d)\n", region->bgcolor);

1100 }

1101

1102 delete_region_display_list(ctx, region);

1103

1104 while (buf + 5 < buf_end) {

1105 object_id = AV_RB16(buf);

1106 buf += 2;

1107

1108 object = get_object(ctx, object_id);

1109

1110 if (!object) {

1111 object = av_mallocz(sizeof(DVBSubObject));

1112

1113 object->id = object_id;

1114 object->next = ctx->object_list;

1115 ctx->object_list = object;

1116 }

1117

1118 object->type = (*buf) >> 6;

1119

1120 display = av_mallocz(sizeof(DVBSubObjectDisplay));

1121

1122 display->object_id = object_id;

1123 display->region_id = region_id;

1124

1125 display->x_pos = AV_RB16(buf) & 0xfff;

1126 buf += 2;

1127 display->y_pos = AV_RB16(buf) & 0xfff;

1128 buf += 2;

1129

1130 if ((object->type == 1 || object->type == 2) && buf+1 < buf_end) {

1131 display->fgcolor = *buf++;

1132 display->bgcolor = *buf++;

1133 }

1134

1135 display->region_list_next = region->display_list;

1136 region->display_list = display;

1137

1138 display->object_list_next = object->display_list;

1139 object->display_list = display;

1140 }

1141 }

1142

1143 static void dvbsub_parse_page_segment(AVCodecContext *avctx,

1144 const uint8_t *buf, int buf_size)

1145 {

1146 DVBSubContext *ctx = avctx->priv_data;

1147 DVBSubRegionDisplay *display;

1148 DVBSubRegionDisplay *tmp_display_list, **tmp_ptr;

1149

1150 const uint8_t *buf_end = buf + buf_size;

1151 int region_id;

1152 int page_state;

1153 int timeout;

1154 int version;

1155

1156 if (buf_size < 1)

1157 return;

1158

1159 timeout = *buf++;

1160 version = ((*buf)>>4) & 15;

1161 page_state = ((*buf++) >> 2) & 3;

1162

1163 if (ctx->version != version) {

1164

1165 ctx->time_out = timeout;

1166 ctx->version = version;

1167

1168 av_dlog(avctx, "Page time out %ds, state %d\n", ctx->time_out, page_state);

1169

1170 if (page_state == 1 || page_state == 2) {

1171 delete_regions(ctx);

1172 delete_objects(ctx);

1173 delete_cluts(ctx);

1174 }

1175

1176 tmp_display_list = ctx->display_list;

1177 ctx->display_list = NULL;

1178 ctx->display_list_size = 0;

1179

1180 while (buf + 5 < buf_end) {

1181 region_id = *buf++;

1182 buf += 1;

1183

1184 display = tmp_display_list;

1185 tmp_ptr = &tmp_display_list;

1186

1187 while (display && display->region_id != region_id) {

1188 tmp_ptr = &display->next;

1189 display = display->next;

1190 }

1191

1192 if (!display)

1193 display = av_mallocz(sizeof(DVBSubRegionDisplay));

1194

1195 display->region_id = region_id;

1196

1197 display->x_pos = AV_RB16(buf);

1198 buf += 2;

1199 display->y_pos = AV_RB16(buf);

1200 buf += 2;

1201

1202 *tmp_ptr = display->next;

1203

1204 display->next = ctx->display_list;

1205 ctx->display_list = display;

1206 ctx->display_list_size++;

1207

1208 av_dlog(avctx, "Region %d, (%d,%d)\n", region_id, display->x_pos, display->y_pos);

1209 }

1210

1211 while (tmp_display_list) {

1212 display = tmp_display_list;

1213

1214 tmp_display_list = display->next;

1215

1216 av_free(display);

1217 }

1218 }

1219

1220 }

1221

1222

1223 #ifdef DEBUG

1224 static void save_display_set(DVBSubContext *ctx)

1225 {

1226 DVBSubRegion *region;

1227 DVBSubRegionDisplay *display;

1228 DVBSubCLUT *clut;

1229 uint32_t *clut_table;

1230 int x_pos, y_pos, width, height;

1231 int x, y, y_off, x_off;

1232 uint32_t *pbuf;

1233 char filename[32];

1234 static int fileno_index = 0;

1235

1236 x_pos = -1;

1237 y_pos = -1;

1238 width = 0;

1239 height = 0;

1240

1241 for (display = ctx->display_list; display; display = display->next) {

1242 region = get_region(ctx, display->region_id);

1243

1244 if (x_pos == -1) {

1245 x_pos = display->x_pos;

1246 y_pos = display->y_pos;

1247 width = region->width;

1248 height = region->height;

1249 } else {

1250 if (display->x_pos < x_pos) {

1251 width += (x_pos - display->x_pos);

1252 x_pos = display->x_pos;

1253 }

1254

1255 if (display->y_pos < y_pos) {

1256 height += (y_pos - display->y_pos);

1257 y_pos = display->y_pos;

1258 }

1259

1260 if (display->x_pos + region->width > x_pos + width) {

1261 width = display->x_pos + region->width - x_pos;

1262 }

1263

1264 if (display->y_pos + region->height > y_pos + height) {

1265 height = display->y_pos + region->height - y_pos;

1266 }

1267 }

1268 }

1269

1270 if (x_pos >= 0) {

1271

1272 pbuf = av_malloc(width * height * 4);

1273

1274 for (display = ctx->display_list; display; display = display->next) {

1275 region = get_region(ctx, display->region_id);

1276

1277 x_off = display->x_pos - x_pos;

1278 y_off = display->y_pos - y_pos;

1279

1280 clut = get_clut(ctx, region->clut);

1281

1282 if (clut == 0)

1283 clut = &default_clut;

1284

1285 switch (region->depth) {

1286 case 2:

1287 clut_table = clut->clut4;

1288 break;

1289 case 8:

1290 clut_table = clut->clut256;

1291 break;

1292 case 4:

1293 default:

1294 clut_table = clut->clut16;

1295 break;

1296 }

1297

1298 for (y = 0; y < region->height; y++) {

1299 for (x = 0; x < region->width; x++) {

1300 pbuf[((y + y_off) * width) + x_off + x] =

1301 clut_table[region->pbuf[y * region->width + x]];

1302 }

1303 }

1304

1305 }

1306

1307 snprintf(filename, sizeof(filename), "dvbs.%d", fileno_index);

1308

1309 png_save2(filename, pbuf, width, height);

1310

1311 av_free(pbuf);

1312 }

1313

1314 fileno_index++;

1315 }

1316 #endif

1317

1318 static void dvbsub_parse_display_definition_segment(AVCodecContext *avctx,

1319 const uint8_t *buf,

1320 int buf_size)

1321 {

1322 DVBSubContext *ctx = avctx->priv_data;

1323 DVBSubDisplayDefinition *display_def = ctx->display_definition;

1324 int dds_version, info_byte;

1325

1326 if (buf_size < 5)

1327 return;

1328

1329 info_byte = bytestream_get_byte(&buf);

1330 dds_version = info_byte >> 4;

1331 if (display_def && display_def->version == dds_version)

1332 return; // already have this display definition version

1333

1334 if (!display_def) {

1335 display_def = av_mallocz(sizeof(*display_def));

1336 ctx->display_definition = display_def;

1337 }

1338 if (!display_def)

1339 return;

1340

1341 display_def->version = dds_version;

1342 display_def->x = 0;

1343 display_def->y = 0;

1344 display_def->width = bytestream_get_be16(&buf) + 1;

1345 display_def->height = bytestream_get_be16(&buf) + 1;

1346 if (!avctx->width || !avctx->height) {

1347 avctx->width = display_def->width;

1348 avctx->height = display_def->height;

1349 }

1350

1351 if (buf_size < 13)

1352 return;

1353

1354 if (info_byte & 1<<3) { // display_window_flag

1355 display_def->x = bytestream_get_be16(&buf);

1356 display_def->y = bytestream_get_be16(&buf);

1357 display_def->width = bytestream_get_be16(&buf) - display_def->x + 1;

1358 display_def->height = bytestream_get_be16(&buf) - display_def->y + 1;

1359 }

1360 }

1361

1362 static int dvbsub_display_end_segment(AVCodecContext *avctx, const uint8_t *buf,

1363 int buf_size, AVSubtitle *sub)

1364 {

1365 DVBSubContext *ctx = avctx->priv_data;

1366 DVBSubDisplayDefinition *display_def = ctx->display_definition;

1367

1368 DVBSubRegion *region;

1369 DVBSubRegionDisplay *display;

1370 AVSubtitleRect *rect;

1371 DVBSubCLUT *clut;

1372 uint32_t *clut_table;

1373 int i;

1374 int offset_x=0, offset_y=0;

1375

1376 sub->end_display_time = ctx->time_out * 1000;

1377

1378 if (display_def) {

1379 offset_x = display_def->x;

1380 offset_y = display_def->y;

1381 }

1382

1383 sub->num_rects = ctx->display_list_size;

1384

1385 if (sub->num_rects > 0){

1386 sub->rects = av_mallocz(sizeof(*sub->rects) * sub->num_rects);

1387 for(i=0; i<sub->num_rects; i++)

1388 sub->rects[i] = av_mallocz(sizeof(*sub->rects[i]));

1389

1390 i = 0;

1391

1392 for (display = ctx->display_list; display; display = display->next) {

1393 region = get_region(ctx, display->region_id);

1394

1395 if (!region)

1396 continue;

1397

1398 if (!region->dirty)

1399 continue;

1400

1401 rect = sub->rects[i];

1402 rect->x = display->x_pos + offset_x;

1403 rect->y = display->y_pos + offset_y;

1404 rect->w = region->width;

1405 rect->h = region->height;

1406 rect->nb_colors = (1 << region->depth);

1407 rect->type = SUBTITLE_BITMAP;

1408 rect->pict.linesize[0] = region->width;

1409

1410 clut = get_clut(ctx, region->clut);

1411

1412 if (!clut)

1413 clut = &default_clut;

1414

1415 switch (region->depth) {

1416 case 2:

1417 clut_table = clut->clut4;

1418 break;

1419 case 8:

1420 clut_table = clut->clut256;

1421 break;

1422 case 4:

1423 default:

1424 clut_table = clut->clut16;

1425 break;

1426 }

1427

1428 rect->pict.data[1] = av_mallocz(AVPALETTE_SIZE);

1429 memcpy(rect->pict.data[1], clut_table, (1 << region->depth) * sizeof(uint32_t));

1430

1431 rect->pict.data[0] = av_malloc(region->buf_size);

1432 memcpy(rect->pict.data[0], region->pbuf, region->buf_size);

1433

1434 i++;

1435 }

1436

1437 sub->num_rects = i;

1438 }

1439 #ifdef DEBUG

1440 save_display_set(ctx);

1441 #endif

1442

1443 return 1;

1444 }

1445

1446 static int dvbsub_decode(AVCodecContext *avctx,

1447 void *data, int *data_size,

1448 AVPacket *avpkt)

1449 {

1450 const uint8_t *buf = avpkt->data;

1451 int buf_size = avpkt->size;

1452 DVBSubContext *ctx = avctx->priv_data;

1453 AVSubtitle *sub = data;

1454 const uint8_t *p, *p_end;

1455 int segment_type;

1456 int page_id;

1457 int segment_length;

1458 int i;

1459 int got_segment = 0;

1460

1461 av_dlog(avctx, "DVB sub packet:\n");

1462

1463 for (i=0; i < buf_size; i++) {

1464 av_dlog(avctx, "%02x ", buf[i]);

1465 if (i % 16 == 15)

1466 av_dlog(avctx, "\n");

1467 }

1468

1469 if (i % 16)

1470 av_dlog(avctx, "\n");

1471

1472 if (buf_size <= 6 || *buf != 0x0f) {

1473 av_dlog(avctx, "incomplete or broken packet");

1474 return -1;

1475 }

1476

1477 p = buf;

1478 p_end = buf + buf_size;

1479

1480 while (p_end - p >= 6 && *p == 0x0f) {

1481 p += 1;

1482 segment_type = *p++;

1483 page_id = AV_RB16(p);

1484 p += 2;

1485 segment_length = AV_RB16(p);

1486 p += 2;

1487

1488 if (p_end - p < segment_length) {

1489 av_dlog(avctx, "incomplete or broken packet");

1490 return -1;

1491 }

1492

1493 if (page_id == ctx->composition_id || page_id == ctx->ancillary_id ||

1494 ctx->composition_id == -1 || ctx->ancillary_id == -1) {

1495 switch (segment_type) {

1496 case DVBSUB_PAGE_SEGMENT:

1497 dvbsub_parse_page_segment(avctx, p, segment_length);

1498 got_segment |= 1;

1499 break;

1500 case DVBSUB_REGION_SEGMENT:

1501 dvbsub_parse_region_segment(avctx, p, segment_length);

1502 got_segment |= 2;

1503 break;

1504 case DVBSUB_CLUT_SEGMENT:

1505 dvbsub_parse_clut_segment(avctx, p, segment_length);

1506 got_segment |= 4;

1507 break;

1508 case DVBSUB_OBJECT_SEGMENT:

1509 dvbsub_parse_object_segment(avctx, p, segment_length);

1510 got_segment |= 8;

1511 break;

1512 case DVBSUB_DISPLAYDEFINITION_SEGMENT:

1513 dvbsub_parse_display_definition_segment(avctx, p, segment_length);

1514 break;

1515 case DVBSUB_DISPLAY_SEGMENT:

1516 *data_size = dvbsub_display_end_segment(avctx, p, segment_length, sub);

1517 got_segment |= 16;

1518 break;

1519 default:

1520 av_dlog(avctx, "Subtitling segment type 0x%x, page id %d, length %d\n",

1521 segment_type, page_id, segment_length);

1522 break;

1523 }

1524 }

1525

1526 p += segment_length;

1527 }

1528 // Some streams do not send a display segment but if we have all the other

1529 // segments then we need no further data.

1530 if (got_segment == 15 && sub)

1531 *data_size = dvbsub_display_end_segment(avctx, p, 0, sub);

1532

1533 return p - buf;

1534 }

1535

1536

1537 AVCodec ff_dvbsub_decoder = {

1538 .name = "dvbsub",

1539 .type = AVMEDIA_TYPE_SUBTITLE,

1540 .id = AV_CODEC_ID_DVB_SUBTITLE,

1541 .priv_data_size = sizeof(DVBSubContext),

1542 .init = dvbsub_init_decoder,

1543 .close = dvbsub_close_decoder,

1544 .decode = dvbsub_decode,

1545 .long_name = NULL_IF_CONFIG_SMALL("DVB subtitles"),

1546 };

Generated on Wed Jul 10 2013 23:47:57 for FFmpeg by doxygen 1.8.2