FFmpeg: libavcodec/dvdsubdec.c Source File

FFmpeg

[フレーム]

libavcodec

dvdsubdec.c

Go to the documentation of this file.

1 /*

2 * DVD 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 */

22 #include "avcodec.h"

23 #include "get_bits.h"

24 #include "internal.h"

26 #include "libavutil/attributes.h"

27 #include "libavutil/colorspace.h"

28 #include "libavutil/opt.h"

29 #include "libavutil/imgutils.h"

30 #include "libavutil/avstring.h"

31 #include "libavutil/bswap.h"

33 typedef struct DVDSubContext

34 {

35 AVClass *class;

36 uint32_t palette[16];

37 char *palette_str;

38 char *ifo_str;

39 int has_palette;

40 uint8_t colormap[4];

41 uint8_t alpha[256];

42 uint8_t buf[0x10000];

43 int buf_size;

44 int forced_subs_only;

45 #ifdef DEBUG

46 int sub_id;

47 #endif

48 } DVDSubContext;

50 static void yuv_a_to_rgba(const uint8_t *ycbcr, const uint8_t *alpha, uint32_t *rgba, int num_values)

51 {

52 const uint8_t *cm = ff_crop_tab + MAX_NEG_CROP;

53 uint8_t r, g, b;

54 int i, y, cb, cr;

55 int r_add, g_add, b_add;

57 for (i = num_values; i > 0; i--) {

58 y = *ycbcr++;

59 cr = *ycbcr++;

60 cb = *ycbcr++;

61 YUV_TO_RGB1_CCIR(cb, cr);

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

63 *rgba++ = (*alpha++ << 24) | (r << 16) | (g << 8) | b;

64 }

65 }

67 static int decode_run_2bit(GetBitContext *gb, int *color)

68 {

69 unsigned int v, t;

71 v = 0;

72 for (t = 1; v < t && t <= 0x40; t <<= 2)

73 v = (v << 4) | get_bits(gb, 4);

74 *color = v & 3;

75 if (v < 4) { /* Code for fill rest of line */

76 return INT_MAX;

77 }

78 return v >> 2;

79 }

81 static int decode_run_8bit(GetBitContext *gb, int *color)

82 {

83 int len;

84 int has_run = get_bits1(gb);

85 if (get_bits1(gb))

86 *color = get_bits(gb, 8);

87 else

88 *color = get_bits(gb, 2);

89 if (has_run) {

90 if (get_bits1(gb)) {

91 len = get_bits(gb, 7);

92 if (len == 0)

93 len = INT_MAX;

94 else

95 len += 9;

96 } else

97 len = get_bits(gb, 3) + 2;

98 } else

99 len = 1;

100 return len;

101 }

102

103 static int decode_rle(uint8_t *bitmap, int linesize, int w, int h,

104 const uint8_t *buf, int start, int buf_size, int is_8bit)

105 {

106 GetBitContext gb;

107 int bit_len;

108 int x, y, len, color;

109 uint8_t *d;

110

111 if (start >= buf_size)

112 return -1;

113

114 if (w <= 0 || h <= 0)

115 return -1;

116

117 bit_len = (buf_size - start) * 8;

118 init_get_bits(&gb, buf + start, bit_len);

119

120 x = 0;

121 y = 0;

122 d = bitmap;

123 for(;;) {

124 if (get_bits_count(&gb) > bit_len)

125 return -1;

126 if (is_8bit)

127 len = decode_run_8bit(&gb, &color);

128 else

129 len = decode_run_2bit(&gb, &color);

130 len = FFMIN(len, w - x);

131 memset(d + x, color, len);

132 x += len;

133 if (x >= w) {

134 y++;

135 if (y >= h)

136 break;

137 d += linesize;

138 x = 0;

139 /* byte align */

140 align_get_bits(&gb);

141 }

142 }

143 return 0;

144 }

145

146 static void guess_palette(DVDSubContext* ctx,

147 uint32_t *rgba_palette,

148 uint32_t subtitle_color)

149 {

150 static const uint8_t level_map[4][4] = {

151 // this configuration (full range, lowest to highest) in tests

152 // seemed most common, so assume this

153 {0xff},

154 {0x00, 0xff},

155 {0x00, 0x80, 0xff},

156 {0x00, 0x55, 0xaa, 0xff},

157 };

158 uint8_t color_used[16] = { 0 };

159 int nb_opaque_colors, i, level, j, r, g, b;

160 uint8_t *colormap = ctx->colormap, *alpha = ctx->alpha;

161

162 if(ctx->has_palette) {

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

164 rgba_palette[i] = (ctx->palette[colormap[i]] & 0x00ffffff)

165 | ((alpha[i] * 17U) << 24);

166 return;

167 }

168

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

170 rgba_palette[i] = 0;

171

172 nb_opaque_colors = 0;

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

174 if (alpha[i] != 0 && !color_used[colormap[i]]) {

175 color_used[colormap[i]] = 1;

176 nb_opaque_colors++;

177 }

178 }

179

180 if (nb_opaque_colors == 0)

181 return;

182

183 j = 0;

184 memset(color_used, 0, 16);

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

186 if (alpha[i] != 0) {

187 if (!color_used[colormap[i]]) {

188 level = level_map[nb_opaque_colors][j];

189 r = (((subtitle_color >> 16) & 0xff) * level) >> 8;

190 g = (((subtitle_color >> 8) & 0xff) * level) >> 8;

191 b = (((subtitle_color >> 0) & 0xff) * level) >> 8;

192 rgba_palette[i] = b | (g << 8) | (r << 16) | ((alpha[i] * 17) << 24);

193 color_used[colormap[i]] = (i + 1);

194 j++;

195 } else {

196 rgba_palette[i] = (rgba_palette[color_used[colormap[i]] - 1] & 0x00ffffff) |

197 ((alpha[i] * 17) << 24);

198 }

199 }

200 }

201 }

202

203 static void reset_rects(AVSubtitle *sub_header)

204 {

205 int i;

206

207 if (sub_header->rects) {

208 for (i = 0; i < sub_header->num_rects; i++) {

209 av_freep(&sub_header->rects[i]->data[0]);

210 av_freep(&sub_header->rects[i]->data[1]);

211 av_freep(&sub_header->rects[i]);

212 }

213 av_freep(&sub_header->rects);

214 sub_header->num_rects = 0;

215 }

216 }

217

218 #define READ_OFFSET(a) (big_offsets ? AV_RB32(a) : AV_RB16(a))

219

220 static int decode_dvd_subtitles(DVDSubContext *ctx, AVSubtitle *sub_header,

221 const uint8_t *buf, int buf_size)

222 {

223 int cmd_pos, pos, cmd, x1, y1, x2, y2, next_cmd_pos;

224 int big_offsets, offset_size, is_8bit = 0;

225 const uint8_t *yuv_palette = NULL;

226 uint8_t *colormap = ctx->colormap, *alpha = ctx->alpha;

227 int date;

228 int i;

229 int is_menu = 0;

230 uint32_t size;

231 int64_t offset1, offset2;

232

233 if (buf_size < 10)

234 return -1;

235

236 if (AV_RB16(buf) == 0) { /* HD subpicture with 4-byte offsets */

237 big_offsets = 1;

238 offset_size = 4;

239 cmd_pos = 6;

240 } else {

241 big_offsets = 0;

242 offset_size = 2;

243 cmd_pos = 2;

244 }

245

246 size = READ_OFFSET(buf + (big_offsets ? 2 : 0));

247 cmd_pos = READ_OFFSET(buf + cmd_pos);

248

249 if (cmd_pos < 0 || cmd_pos > buf_size - 2 - offset_size) {

250 if (cmd_pos > size) {

251 av_log(ctx, AV_LOG_ERROR, "Discarding invalid packet\n");

252 return 0;

253 }

254 return AVERROR(EAGAIN);

255 }

256

257 while (cmd_pos > 0 && cmd_pos < buf_size - 2 - offset_size) {

258 date = AV_RB16(buf + cmd_pos);

259 next_cmd_pos = READ_OFFSET(buf + cmd_pos + 2);

260 ff_dlog(NULL, "cmd_pos=0x%04x next=0x%04x date=%d\n",

261 cmd_pos, next_cmd_pos, date);

262 pos = cmd_pos + 2 + offset_size;

263 offset1 = -1;

264 offset2 = -1;

265 x1 = y1 = x2 = y2 = 0;

266 while (pos < buf_size) {

267 cmd = buf[pos++];

268 ff_dlog(NULL, "cmd=%02x\n", cmd);

269 switch(cmd) {

270 case 0x00:

271 /* menu subpicture */

272 is_menu = 1;

273 break;

274 case 0x01:

275 /* set start date */

276 sub_header->start_display_time = (date << 10) / 90;

277 break;

278 case 0x02:

279 /* set end date */

280 sub_header->end_display_time = (date << 10) / 90;

281 break;

282 case 0x03:

283 /* set colormap */

284 if ((buf_size - pos) < 2)

285 goto fail;

286 colormap[3] = buf[pos] >> 4;

287 colormap[2] = buf[pos] & 0x0f;

288 colormap[1] = buf[pos + 1] >> 4;

289 colormap[0] = buf[pos + 1] & 0x0f;

290 pos += 2;

291 break;

292 case 0x04:

293 /* set alpha */

294 if ((buf_size - pos) < 2)

295 goto fail;

296 alpha[3] = buf[pos] >> 4;

297 alpha[2] = buf[pos] & 0x0f;

298 alpha[1] = buf[pos + 1] >> 4;

299 alpha[0] = buf[pos + 1] & 0x0f;

300 pos += 2;

301 ff_dlog(NULL, "alpha=%x%x%x%x\n", alpha[0],alpha[1],alpha[2],alpha[3]);

302 break;

303 case 0x05:

304 case 0x85:

305 if ((buf_size - pos) < 6)

306 goto fail;

307 x1 = (buf[pos] << 4) | (buf[pos + 1] >> 4);

308 x2 = ((buf[pos + 1] & 0x0f) << 8) | buf[pos + 2];

309 y1 = (buf[pos + 3] << 4) | (buf[pos + 4] >> 4);

310 y2 = ((buf[pos + 4] & 0x0f) << 8) | buf[pos + 5];

311 if (cmd & 0x80)

312 is_8bit = 1;

313 ff_dlog(NULL, "x1=%d x2=%d y1=%d y2=%d\n", x1, x2, y1, y2);

314 pos += 6;

315 break;

316 case 0x06:

317 if ((buf_size - pos) < 4)

318 goto fail;

319 offset1 = AV_RB16(buf + pos);

320 offset2 = AV_RB16(buf + pos + 2);

321 ff_dlog(NULL, "offset1=0x%04"PRIx64" offset2=0x%04"PRIx64"\n", offset1, offset2);

322 pos += 4;

323 break;

324 case 0x86:

325 if ((buf_size - pos) < 8)

326 goto fail;

327 offset1 = AV_RB32(buf + pos);

328 offset2 = AV_RB32(buf + pos + 4);

329 ff_dlog(NULL, "offset1=0x%04"PRIx64" offset2=0x%04"PRIx64"\n", offset1, offset2);

330 pos += 8;

331 break;

332

333 case 0x83:

334 /* HD set palette */

335 if ((buf_size - pos) < 768)

336 goto fail;

337 yuv_palette = buf + pos;

338 pos += 768;

339 break;

340 case 0x84:

341 /* HD set contrast (alpha) */

342 if ((buf_size - pos) < 256)

343 goto fail;

344 for (i = 0; i < 256; i++)

345 alpha[i] = 0xFF - buf[pos+i];

346 pos += 256;

347 break;

348

349 case 0xff:

350 goto the_end;

351 default:

352 ff_dlog(NULL, "unrecognised subpicture command 0x%x\n", cmd);

353 goto the_end;

354 }

355 }

356 the_end:

357 if (offset1 >= buf_size || offset2 >= buf_size)

358 goto fail;

359

360 if (offset1 >= 0 && offset2 >= 0) {

361 int w, h;

362 uint8_t *bitmap;

363

364 /* decode the bitmap */

365 w = x2 - x1 + 1;

366 if (w < 0)

367 w = 0;

368 h = y2 - y1 + 1;

369 if (h < 0)

370 h = 0;

371 if (w > 0 && h > 0) {

372 reset_rects(sub_header);

373

374 sub_header->rects = av_mallocz(sizeof(*sub_header->rects));

375 if (!sub_header->rects)

376 goto fail;

377 sub_header->rects[0] = av_mallocz(sizeof(AVSubtitleRect));

378 if (!sub_header->rects[0])

379 goto fail;

380 sub_header->num_rects = 1;

381 bitmap = sub_header->rects[0]->data[0] = av_malloc(w * h);

382 if (!bitmap)

383 goto fail;

384 if (decode_rle(bitmap, w * 2, w, (h + 1) / 2,

385 buf, offset1, buf_size, is_8bit) < 0)

386 goto fail;

387 if (decode_rle(bitmap + w, w * 2, w, h / 2,

388 buf, offset2, buf_size, is_8bit) < 0)

389 goto fail;

390 sub_header->rects[0]->data[1] = av_mallocz(AVPALETTE_SIZE);

391 if (!sub_header->rects[0]->data[1])

392 goto fail;

393 if (is_8bit) {

394 if (!yuv_palette)

395 goto fail;

396 sub_header->rects[0]->nb_colors = 256;

397 yuv_a_to_rgba(yuv_palette, alpha,

398 (uint32_t *)sub_header->rects[0]->data[1],

399 256);

400 } else {

401 sub_header->rects[0]->nb_colors = 4;

402 guess_palette(ctx, (uint32_t*)sub_header->rects[0]->data[1],

403 0xffff00);

404 }

405 sub_header->rects[0]->x = x1;

406 sub_header->rects[0]->y = y1;

407 sub_header->rects[0]->w = w;

408 sub_header->rects[0]->h = h;

409 sub_header->rects[0]->type = SUBTITLE_BITMAP;

410 sub_header->rects[0]->linesize[0] = w;

411 sub_header->rects[0]->flags = is_menu ? AV_SUBTITLE_FLAG_FORCED : 0;

412

413 #if FF_API_AVPICTURE

414 FF_DISABLE_DEPRECATION_WARNINGS

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

416 sub_header->rects[0]->pict.data[i] = sub_header->rects[0]->data[i];

417 sub_header->rects[0]->pict.linesize[i] = sub_header->rects[0]->linesize[i];

418 }

419 FF_ENABLE_DEPRECATION_WARNINGS

420 #endif

421 }

422 }

423 if (next_cmd_pos < cmd_pos) {

424 av_log(ctx, AV_LOG_ERROR, "Invalid command offset\n");

425 break;

426 }

427 if (next_cmd_pos == cmd_pos)

428 break;

429 cmd_pos = next_cmd_pos;

430 }

431 if (sub_header->num_rects > 0)

432 return is_menu;

433 fail:

434 reset_rects(sub_header);

435 return -1;

436 }

437

438 static int is_transp(const uint8_t *buf, int pitch, int n,

439 const uint8_t *transp_color)

440 {

441 int i;

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

443 if (!transp_color[*buf])

444 return 0;

445 buf += pitch;

446 }

447 return 1;

448 }

449

450 /* return 0 if empty rectangle, 1 if non empty */

451 static int find_smallest_bounding_rectangle(AVSubtitle *s)

452 {

453 uint8_t transp_color[256] = { 0 };

454 int y1, y2, x1, x2, y, w, h, i;

455 uint8_t *bitmap;

456

457 if (s->num_rects == 0 || !s->rects || s->rects[0]->w <= 0 || s->rects[0]->h <= 0)

458 return 0;

459

460 for(i = 0; i < s->rects[0]->nb_colors; i++) {

461 if ((((uint32_t *)s->rects[0]->data[1])[i] >> 24) == 0)

462 transp_color[i] = 1;

463 }

464 y1 = 0;

465 while (y1 < s->rects[0]->h && is_transp(s->rects[0]->data[0] + y1 * s->rects[0]->linesize[0],

466 1, s->rects[0]->w, transp_color))

467 y1++;

468 if (y1 == s->rects[0]->h) {

469 av_freep(&s->rects[0]->data[0]);

470 s->rects[0]->w = s->rects[0]->h = 0;

471 return 0;

472 }

473

474 y2 = s->rects[0]->h - 1;

475 while (y2 > 0 && is_transp(s->rects[0]->data[0] + y2 * s->rects[0]->linesize[0], 1,

476 s->rects[0]->w, transp_color))

477 y2--;

478 x1 = 0;

479 while (x1 < (s->rects[0]->w - 1) && is_transp(s->rects[0]->data[0] + x1, s->rects[0]->linesize[0],

480 s->rects[0]->h, transp_color))

481 x1++;

482 x2 = s->rects[0]->w - 1;

483 while (x2 > 0 && is_transp(s->rects[0]->data[0] + x2, s->rects[0]->linesize[0], s->rects[0]->h,

484 transp_color))

485 x2--;

486 w = x2 - x1 + 1;

487 h = y2 - y1 + 1;

488 bitmap = av_malloc(w * h);

489 if (!bitmap)

490 return 1;

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

492 memcpy(bitmap + w * y, s->rects[0]->data[0] + x1 + (y1 + y) * s->rects[0]->linesize[0], w);

493 }

494 av_freep(&s->rects[0]->data[0]);

495 s->rects[0]->data[0] = bitmap;

496 s->rects[0]->linesize[0] = w;

497 s->rects[0]->w = w;

498 s->rects[0]->h = h;

499 s->rects[0]->x += x1;

500 s->rects[0]->y += y1;

501

502 #if FF_API_AVPICTURE

503 FF_DISABLE_DEPRECATION_WARNINGS

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

505 s->rects[0]->pict.data[i] = s->rects[0]->data[i];

506 s->rects[0]->pict.linesize[i] = s->rects[0]->linesize[i];

507 }

508 FF_ENABLE_DEPRECATION_WARNINGS

509 #endif

510

511 return 1;

512 }

513

514 #ifdef DEBUG

515 #define ALPHA_MIX(A,BACK,FORE) (((255-(A)) * (BACK) + (A) * (FORE)) / 255)

516 static void ppm_save(const char *filename, uint8_t *bitmap, int w, int h,

517 uint32_t *rgba_palette)

518 {

519 int x, y, alpha;

520 uint32_t v;

521 int back[3] = {0, 255, 0}; /* green background */

522 FILE *f;

523

524 f = fopen(filename, "w");

525 if (!f) {

526 perror(filename);

527 return;

528 }

529 fprintf(f, "P6\n"

530 "%d %d\n"

531 "%d\n",

532 w, h, 255);

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

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

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

536 alpha = v >> 24;

537 putc(ALPHA_MIX(alpha, back[0], (v >> 16) & 0xff), f);

538 putc(ALPHA_MIX(alpha, back[1], (v >> 8) & 0xff), f);

539 putc(ALPHA_MIX(alpha, back[2], (v >> 0) & 0xff), f);

540 }

541 }

542 fclose(f);

543 }

544 #endif

545

546 static int append_to_cached_buf(AVCodecContext *avctx,

547 const uint8_t *buf, int buf_size)

548 {

549 DVDSubContext *ctx = avctx->priv_data;

550

551 if (ctx->buf_size >= sizeof(ctx->buf) - buf_size) {

552 av_log(avctx, AV_LOG_WARNING, "Attempt to reconstruct "

553 "too large SPU packets aborted.\n");

554 ctx->buf_size = 0;

555 return AVERROR_INVALIDDATA;

556 }

557 memcpy(ctx->buf + ctx->buf_size, buf, buf_size);

558 ctx->buf_size += buf_size;

559 return 0;

560 }

561

562 static int dvdsub_decode(AVCodecContext *avctx,

563 void *data, int *data_size,

564 AVPacket *avpkt)

565 {

566 DVDSubContext *ctx = avctx->priv_data;

567 const uint8_t *buf = avpkt->data;

568 int buf_size = avpkt->size;

569 AVSubtitle *sub = data;

570 int appended = 0;

571 int is_menu;

572

573 if (ctx->buf_size) {

574 int ret = append_to_cached_buf(avctx, buf, buf_size);

575 if (ret < 0) {

576 *data_size = 0;

577 return ret;

578 }

579 buf = ctx->buf;

580 buf_size = ctx->buf_size;

581 appended = 1;

582 }

583

584 is_menu = decode_dvd_subtitles(ctx, sub, buf, buf_size);

585 if (is_menu == AVERROR(EAGAIN)) {

586 *data_size = 0;

587 return appended ? 0 : append_to_cached_buf(avctx, buf, buf_size);

588 }

589

590 if (is_menu < 0) {

591 no_subtitle:

592 reset_rects(sub);

593 *data_size = 0;

594

595 return buf_size;

596 }

597 if (!is_menu && find_smallest_bounding_rectangle(sub) == 0)

598 goto no_subtitle;

599

600 if (ctx->forced_subs_only && !(sub->rects[0]->flags & AV_SUBTITLE_FLAG_FORCED))

601 goto no_subtitle;

602

603 #if defined(DEBUG)

604 {

605 char ppm_name[32];

606

607 snprintf(ppm_name, sizeof(ppm_name), "/tmp/%05d.ppm", ctx->sub_id++);

608 ff_dlog(NULL, "start=%d ms end =%d ms\n",

609 sub->start_display_time,

610 sub->end_display_time);

611 ppm_save(ppm_name, sub->rects[0]->data[0],

612 sub->rects[0]->w, sub->rects[0]->h, (uint32_t*) sub->rects[0]->data[1]);

613 }

614 #endif

615

616 ctx->buf_size = 0;

617 *data_size = 1;

618 return buf_size;

619 }

620

621 static void parse_palette(DVDSubContext *ctx, char *p)

622 {

623 int i;

624

625 ctx->has_palette = 1;

626 for(i=0;i<16;i++) {

627 ctx->palette[i] = strtoul(p, &p, 16);

628 while(*p == ',' || av_isspace(*p))

629 p++;

630 }

631 }

632

633 static int parse_ifo_palette(DVDSubContext *ctx, char *p)

634 {

635 FILE *ifo;

636 char ifostr[12];

637 uint32_t sp_pgci, pgci, off_pgc, pgc;

638 uint8_t r, g, b, yuv[65], *buf;

639 int i, y, cb, cr, r_add, g_add, b_add;

640 int ret = 0;

641 const uint8_t *cm = ff_crop_tab + MAX_NEG_CROP;

642

643 ctx->has_palette = 0;

644 if ((ifo = fopen(p, "r")) == NULL) {

645 av_log(ctx, AV_LOG_WARNING, "Unable to open IFO file \"%s\": %s\n", p, av_err2str(AVERROR(errno)));

646 return AVERROR_EOF;

647 }

648 if (fread(ifostr, 12, 1, ifo) != 1 || memcmp(ifostr, "DVDVIDEO-VTS", 12)) {

649 av_log(ctx, AV_LOG_WARNING, "\"%s\" is not a proper IFO file\n", p);

650 ret = AVERROR_INVALIDDATA;

651 goto end;

652 }

653 if (fseek(ifo, 0xCC, SEEK_SET) == -1) {

654 ret = AVERROR(errno);

655 goto end;

656 }

657 if (fread(&sp_pgci, 4, 1, ifo) == 1) {

658 pgci = av_be2ne32(sp_pgci) * 2048;

659 if (fseek(ifo, pgci + 0x0C, SEEK_SET) == -1) {

660 ret = AVERROR(errno);

661 goto end;

662 }

663 if (fread(&off_pgc, 4, 1, ifo) == 1) {

664 pgc = pgci + av_be2ne32(off_pgc);

665 if (fseek(ifo, pgc + 0xA4, SEEK_SET) == -1) {

666 ret = AVERROR(errno);

667 goto end;

668 }

669 if (fread(yuv, 64, 1, ifo) == 1) {

670 buf = yuv;

671 for(i=0; i<16; i++) {

672 y = *++buf;

673 cr = *++buf;

674 cb = *++buf;

675 YUV_TO_RGB1_CCIR(cb, cr);

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

677 ctx->palette[i] = (r << 16) + (g << 8) + b;

678 buf++;

679 }

680 ctx->has_palette = 1;

681 }

682 }

683 }

684 if (ctx->has_palette == 0) {

685 av_log(ctx, AV_LOG_WARNING, "Failed to read palette from IFO file \"%s\"\n", p);

686 ret = AVERROR_INVALIDDATA;

687 }

688 end:

689 fclose(ifo);

690 return ret;

691 }

692

693 static int dvdsub_parse_extradata(AVCodecContext *avctx)

694 {

695 DVDSubContext *ctx = (DVDSubContext*) avctx->priv_data;

696 char *dataorig, *data;

697 int ret = 1;

698

699 if (!avctx->extradata || !avctx->extradata_size)

700 return 1;

701

702 dataorig = data = av_malloc(avctx->extradata_size+1);

703 if (!data)

704 return AVERROR(ENOMEM);

705 memcpy(data, avctx->extradata, avctx->extradata_size);

706 data[avctx->extradata_size] = '0円';

707

708 for(;;) {

709 int pos = strcspn(data, "\n\r");

710 if (pos==0 && *data==0)

711 break;

712

713 if (strncmp("palette:", data, 8) == 0) {

714 parse_palette(ctx, data + 8);

715 } else if (strncmp("size:", data, 5) == 0) {

716 int w, h;

717 if (sscanf(data + 5, "%dx%d", &w, &h) == 2) {

718 ret = ff_set_dimensions(avctx, w, h);

719 if (ret < 0)

720 goto fail;

721 }

722 }

723

724 data += pos;

725 data += strspn(data, "\n\r");

726 }

727

728 fail:

729 av_free(dataorig);

730 return ret;

731 }

732

733 static av_cold int dvdsub_init(AVCodecContext *avctx)

734 {

735 DVDSubContext *ctx = avctx->priv_data;

736 int ret;

737

738 if ((ret = dvdsub_parse_extradata(avctx)) < 0)

739 return ret;

740

741 if (ctx->ifo_str)

742 parse_ifo_palette(ctx, ctx->ifo_str);

743 if (ctx->palette_str)

744 parse_palette(ctx, ctx->palette_str);

745 if (ctx->has_palette) {

746 int i;

747 av_log(avctx, AV_LOG_DEBUG, "palette:");

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

749 av_log(avctx, AV_LOG_DEBUG, " 0x%06x", ctx->palette[i]);

750 av_log(avctx, AV_LOG_DEBUG, "\n");

751 }

752

753 return 1;

754 }

755

756 static void dvdsub_flush(AVCodecContext *avctx)

757 {

758 DVDSubContext *ctx = avctx->priv_data;

759 ctx->buf_size = 0;

760 }

761

762 static av_cold int dvdsub_close(AVCodecContext *avctx)

763 {

764 dvdsub_flush(avctx);

765 return 0;

766 }

767

768 #define OFFSET(field) offsetof(DVDSubContext, field)

769 #define SD AV_OPT_FLAG_SUBTITLE_PARAM | AV_OPT_FLAG_DECODING_PARAM

770 static const AVOption options[] = {

771 { "palette", "set the global palette", OFFSET(palette_str), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, SD },

772 { "ifo_palette", "obtain the global palette from .IFO file", OFFSET(ifo_str), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, SD },

773 { "forced_subs_only", "Only show forced subtitles", OFFSET(forced_subs_only), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, SD},

774 { NULL }

775 };

776 static const AVClass dvdsub_class = {

777 .class_name = "dvdsubdec",

778 .item_name = av_default_item_name,

779 .option = options,

780 .version = LIBAVUTIL_VERSION_INT,

781 };

782

783 AVCodec ff_dvdsub_decoder = {

784 .name = "dvdsub",

785 .long_name = NULL_IF_CONFIG_SMALL("DVD subtitles"),

786 .type = AVMEDIA_TYPE_SUBTITLE,

787 .id = AV_CODEC_ID_DVD_SUBTITLE,

788 .priv_data_size = sizeof(DVDSubContext),

789 .init = dvdsub_init,

790 .decode = dvdsub_decode,

791 .flush = dvdsub_flush,

792 .close = dvdsub_close,

793 .priv_class = &dvdsub_class,

794 };

DVDSubContext::colormap

uint8_t colormap[4]

Definition: dvdsubdec.c:40

NULL

#define NULL

Definition: coverity.c:32

const char * s

Definition: avisynth_c.h:631

AVERROR_INVALIDDATA

#define AVERROR_INVALIDDATA

Invalid data found when processing input.

Definition: error.h:59

dvdsub_flush

static void dvdsub_flush(AVCodecContext *avctx)

Definition: dvdsubdec.c:756

AVSubtitleRect::x

int x

top left corner of pict, undefined when pict is not set

Definition: avcodec.h:3699

Definition: vp9dsp_template.c:2093

AVOption

AVOption.

Definition: opt.h:245

data

ptrdiff_t const GLvoid * data

Definition: opengl_enc.c:101

flush

static void flush(AVCodecContext *avctx)

Definition: aacdec_template.c:496

DVDSubContext::buf_size

int buf_size

Definition: dvdsubdec.c:43

ctx

AVFormatContext * ctx

Definition: movenc-test.c:48

imgutils.h

misc image utilities

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

LIBAVUTIL_VERSION_INT

#define LIBAVUTIL_VERSION_INT

Definition: version.h:70

YUV_TO_RGB1_CCIR

#define YUV_TO_RGB1_CCIR(cb1, cr1)

Definition: colorspace.h:34

DVDSubContext::alpha

uint8_t alpha[256]

Definition: dvdsubdec.c:41

ff_set_dimensions

int ff_set_dimensions(AVCodecContext *s, int width, int height)

Check that the provided frame dimensions are valid and set them on the codec context.

Definition: utils.c:209

const char * g

Definition: vf_curves.c:108

init

static av_cold int init(AVCodecContext *avctx)

Definition: avrndec.c:35

AVSubtitleRect::nb_colors

int nb_colors

number of colors in pict, undefined when pict is not set

Definition: avcodec.h:3703

AVPacket::size

int size

Definition: avcodec.h:1468

const char * b

Definition: vf_curves.c:109

av_isspace

static av_const int av_isspace(int c)

Locale-independent conversion of ASCII isspace.

Definition: avstring.h:222

MAX_NEG_CROP

#define MAX_NEG_CROP

Definition: mathops.h:30

colorspace.h

Various defines for YUV<->RGB conversion.

AVSubtitle::num_rects

unsigned num_rects

Definition: avcodec.h:3737

avstring.h

AV_RB16

uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_WB32 unsigned int_TMPL AV_WB24 unsigned int_TMPL AV_RB16

Definition: bytestream.h:87

av_be2ne32

#define av_be2ne32(x)

Definition: bswap.h:93

DVDSubContext::palette

uint32_t palette[16]

Definition: dvdsubdec.c:36

AVCodec

AVCodec.

Definition: avcodec.h:3392

color

Definition: vf_paletteuse.c:564

dvdsub_close

static av_cold int dvdsub_close(AVCodecContext *avctx)

Definition: dvdsubdec.c:762

AVSubtitleRect::pict

attribute_deprecated AVPicture pict

Definition: avcodec.h:3710

attributes.h

Macro definitions for various function/variable attributes.

AVSubtitle::rects

AVSubtitleRect ** rects

Definition: avcodec.h:3738

AV_CODEC_ID_DVD_SUBTITLE

Definition: avcodec.h:506

AVSubtitleRect::w

int w

width of pict, undefined when pict is not set

Definition: avcodec.h:3701

AVClass::class_name

const char * class_name

The name of the class; usually it is the same name as the context structure type to which the AVClass...

Definition: log.h:72

static double cb(void *priv, double x, double y)

Definition: vf_geq.c:97

uint8_t

Definition: audio_convert.c:194

av_cold

#define av_cold

Definition: attributes.h:82

av_malloc

#define av_malloc(s)

Definition: tableprint_vlc.h:31

opt.h

AVOptions.

color

static const uint32_t color[16+AV_CLASS_CATEGORY_NB]

Definition: log.c:94

AVPALETTE_SIZE

#define AVPALETTE_SIZE

Definition: pixfmt.h:33

end

static av_cold int end(AVCodecContext *avctx)

Definition: avrndec.c:90

AVPicture::linesize

attribute_deprecated int linesize[AV_NUM_DATA_POINTERS]

number of bytes per line

Definition: avcodec.h:3670

AVCodecContext::extradata

uint8_t * extradata

some codecs need / can use extradata like Huffman tables.

Definition: avcodec.h:1647

AV_RB32

uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_RB32

Definition: bytestream.h:87

DVDSubContext::ifo_str

char * ifo_str

Definition: dvdsubdec.c:38

reset_rects

static void reset_rects(AVSubtitle *sub_header)

Definition: dvdsubdec.c:203

AV_OPT_TYPE_STRING

Definition: opt.h:227

AVPacket::data

uint8_t * data

Definition: avcodec.h:1467

get_bits_count

static int get_bits_count(const GetBitContext *s)

Definition: get_bits.h:212

ff_dlog

#define ff_dlog(a,...)

Definition: tableprint_vlc.h:29

READ_OFFSET

#define READ_OFFSET(a)

Definition: dvdsubdec.c:218

AVERROR_EOF

#define AVERROR_EOF

End of file.

Definition: error.h:55

get_bits.h

bitstream reader API header.

size

ptrdiff_t size

Definition: opengl_enc.c:101

AVSubtitleRect::h

int h

height of pict, undefined when pict is not set

Definition: avcodec.h:3702

dvdsub_init

static av_cold int dvdsub_init(AVCodecContext *avctx)

Definition: dvdsubdec.c:733

av_log

#define av_log(a,...)

Definition: tableprint_vlc.h:28

#define cm

Definition: dvbsubdec.c:36

AVSubtitle

Definition: avcodec.h:3733

#define SD

Definition: dvdsubdec.c:769

#define U(x)

Definition: vp56_arith.h:37

alpha

static double alpha(void *priv, double x, double y)

Definition: vf_geq.c:99

AV_LOG_ERROR

#define AV_LOG_ERROR

Something went wrong and cannot losslessly be recovered.

Definition: log.h:176

AVSubtitleRect::y

int y

top left corner of pict, undefined when pict is not set

Definition: avcodec.h:3700

av_default_item_name

Definition: libopenh264enc.c:68

AVERROR

#define AVERROR(e)

Definition: error.h:43

NULL_IF_CONFIG_SMALL

#define NULL_IF_CONFIG_SMALL(x)

Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...

Definition: internal.h:176

const char * r

Definition: vf_curves.c:107

AV_LOG_DEBUG

#define AV_LOG_DEBUG

Stuff which is only useful for libav* developers.

Definition: log.h:197

AVCodec::name

const char * name

Name of the codec implementation.

Definition: avcodec.h:3399

append_to_cached_buf

static int append_to_cached_buf(AVCodecContext *avctx, const uint8_t *buf, int buf_size)

Definition: dvdsubdec.c:546

fail

#define fail()

Definition: checkasm.h:80

OFFSET

#define OFFSET(field)

Definition: dvdsubdec.c:768

AVSubtitle::end_display_time

uint32_t end_display_time

Definition: avcodec.h:3736

DVDSubContext::buf

uint8_t buf[0x10000]

Definition: dvdsubdec.c:42

decode_run_8bit

static int decode_run_8bit(GetBitContext *gb, int *color)

Definition: dvdsubdec.c:81

SUBTITLE_BITMAP

A bitmap, pict will be set.

Definition: avcodec.h:3681

AV_SUBTITLE_FLAG_FORCED

#define AV_SUBTITLE_FLAG_FORCED

Definition: avcodec.h:3696

AVSubtitleRect::linesize

int linesize[4]

Definition: avcodec.h:3717

dvdsub_class

static const AVClass dvdsub_class

Definition: dvdsubdec.c:776

FFMIN

#define FFMIN(a, b)

Definition: common.h:96

yuv_a_to_rgba

static void yuv_a_to_rgba(const uint8_t *ycbcr, const uint8_t *alpha, uint32_t *rgba, int num_values)

Definition: dvdsubdec.c:50

av_err2str

#define av_err2str(errnum)

Convenience macro, the return value should be used only directly in function arguments but never stan...

Definition: error.h:119

parse_ifo_palette

static int parse_ifo_palette(DVDSubContext *ctx, char *p)

Definition: dvdsubdec.c:633

is_transp

static int is_transp(const uint8_t *buf, int pitch, int n, const uint8_t *transp_color)

Definition: dvdsubdec.c:438

AV_OPT_TYPE_BOOL

Definition: opt.h:239

AVPicture::data

attribute_deprecated uint8_t * data[AV_NUM_DATA_POINTERS]

pointers to the image data planes

Definition: avcodec.h:3668

int n

Definition: avisynth_c.h:547

DVDSubContext::has_palette

int has_palette

Definition: dvdsubdec.c:39

AVSubtitleRect::data

uint8_t * data[4]

data+linesize for the bitmap of this subtitle.

Definition: avcodec.h:3716

ff_dvdsub_decoder

AVCodec ff_dvdsub_decoder

Definition: dvdsubdec.c:783

parse_palette

static void parse_palette(DVDSubContext *ctx, char *p)

Definition: dvdsubdec.c:621

avcodec.h

Libavcodec external API header.

AVCodecContext

main external API structure.

Definition: avcodec.h:1532

options

static const AVOption options[]

Definition: dvdsubdec.c:770

decode_dvd_subtitles

static int decode_dvd_subtitles(DVDSubContext *ctx, AVSubtitle *sub_header, const uint8_t *buf, int buf_size)

Definition: dvdsubdec.c:220

buf

void * buf

Definition: avisynth_c.h:553

AVCodecContext::extradata_size

int extradata_size

Definition: avcodec.h:1648

get_bits1

static unsigned int get_bits1(GetBitContext *s)

Definition: get_bits.h:312

AVClass

Describe the class of an AVClass context structure.

Definition: log.h:67

YUV_TO_RGB2_CCIR

#define YUV_TO_RGB2_CCIR(r, g, b, y1)

Definition: colorspace.h:44

init_get_bits

static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)

Initialize GetBitContext.

Definition: get_bits.h:418

bswap.h

byte swapping routines

decode_run_2bit

static int decode_run_2bit(GetBitContext *gb, int *color)

Definition: dvdsubdec.c:67

snprintf

#define snprintf

Definition: snprintf.h:34

level

uint8_t level

Definition: svq3.c:150

find_smallest_bounding_rectangle

static int find_smallest_bounding_rectangle(AVSubtitle *s)

Definition: dvdsubdec.c:451

decode

static int decode(AVCodecContext *avctx, void *data, int *got_sub, AVPacket *avpkt)

Definition: ccaption_dec.c:572

FF_DISABLE_DEPRECATION_WARNINGS

#define FF_DISABLE_DEPRECATION_WARNINGS

Definition: internal.h:80

GetBitContext

Definition: get_bits.h:54

DVDSubContext

Definition: dvdsubdec.c:33

internal.h

common internal api header.

if(ret< 0)

Definition: vf_mcdeint.c:282

dvdsub_parse_extradata

static int dvdsub_parse_extradata(AVCodecContext *avctx)

Definition: dvdsubdec.c:693

AVSubtitle::start_display_time

uint32_t start_display_time

Definition: avcodec.h:3735

guess_palette

static void guess_palette(DVDSubContext *ctx, uint32_t *rgba_palette, uint32_t subtitle_color)

Definition: dvdsubdec.c:146

ff_crop_tab

#define ff_crop_tab

Definition: motionpixels_tablegen.c:26

AVCodecContext::priv_data

void * priv_data

Definition: avcodec.h:1574

av_free

#define av_free(p)

Definition: tableprint_vlc.h:34

AVSubtitleRect::flags

int flags

Definition: avcodec.h:3730

FF_ENABLE_DEPRECATION_WARNINGS

#define FF_ENABLE_DEPRECATION_WARNINGS

Definition: internal.h:81

len

int len

Definition: vorbis_enc_data.h:452

dvdsub_decode

static int dvdsub_decode(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt)

Definition: dvdsubdec.c:562

align_get_bits

static const uint8_t * align_get_bits(GetBitContext *s)

Definition: get_bits.h:457

av_freep

#define av_freep(p)

Definition: tableprint_vlc.h:35

start

void INT64 start

Definition: avisynth_c.h:553

static double cr(void *priv, double x, double y)

Definition: vf_geq.c:98

AVSubtitleRect::type

enum AVSubtitleType type

Definition: avcodec.h:3719

AVMEDIA_TYPE_SUBTITLE

Definition: avutil.h:196

AVSubtitleRect

Definition: avcodec.h:3698

AVPacket

This structure stores compressed data.

Definition: avcodec.h:1444

av_mallocz

void * av_mallocz(size_t size)

Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...

Definition: mem.c:252

DVDSubContext::palette_str

char * palette_str

Definition: dvdsubdec.c:37

decode_rle

static int decode_rle(uint8_t *bitmap, int linesize, int w, int h, const uint8_t *buf, int start, int buf_size, int is_8bit)

Definition: dvdsubdec.c:103

DVDSubContext::forced_subs_only

int forced_subs_only

Definition: dvdsubdec.c:44

Generated on Mon Feb 15 2016 15:20:37 for FFmpeg by doxygen 1.8.6