FFmpeg: libavformat/img2dec.c Source File

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libavformat

img2dec.c

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1 /*

2 * Image format

5 *

6 * This file is part of FFmpeg.

7 *

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

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

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

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

12 *

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

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

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

16 * Lesser General Public License for more details.

17 *

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

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

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

21 */

23 #define _BSD_SOURCE

24 #include <sys/stat.h>

25 #include "libavutil/avstring.h"

26 #include "libavutil/log.h"

27 #include "libavutil/opt.h"

28 #include "libavutil/pixdesc.h"

29 #include "libavutil/parseutils.h"

30 #include "libavutil/intreadwrite.h"

31 #include "avformat.h"

32 #include "avio_internal.h"

33 #include "internal.h"

34 #include "img2.h"

36 #if HAVE_GLOB

37 /* Locally define as 0 (bitwise-OR no-op) any missing glob options that

38 are non-posix glibc/bsd extensions. */

39 #ifndef GLOB_NOMAGIC

40 #define GLOB_NOMAGIC 0

41 #endif

42 #ifndef GLOB_BRACE

43 #define GLOB_BRACE 0

44 #endif

46 #endif /* HAVE_GLOB */

48 static const int sizes[][2] = {

49 { 640, 480 },

50 { 720, 480 },

51 { 720, 576 },

52 { 352, 288 },

53 { 352, 240 },

54 { 160, 128 },

55 { 512, 384 },

56 { 640, 352 },

57 { 640, 240 },

58 };

60 static int infer_size(int *width_ptr, int *height_ptr, int size)

61 {

62 int i;

64 for (i = 0; i < FF_ARRAY_ELEMS(sizes); i++) {

65 if ((sizes[i][0] * sizes[i][1]) == size) {

66 *width_ptr = sizes[i][0];

67 *height_ptr = sizes[i][1];

68 return 0;

69 }

70 }

72 return -1;

73 }

75 static int is_glob(const char *path)

76 {

77 #if HAVE_GLOB

78 size_t span = 0;

79 const char *p = path;

81 while (p = strchr(p, '%')) {

82 if (*(++p) == '%') {

83 ++p;

84 continue;

85 }

86 if (span = strspn(p, "*?[]{}"))

87 break;

88 }

89 /* Did we hit a glob char or get to the end? */

90 return span != 0;

91 #else

92 return 0;

93 #endif

94 }

96 /**

97 * Get index range of image files matched by path.

98 *

99 * @param pfirst_index pointer to index updated with the first number in the range

100 * @param plast_index pointer to index updated with the last number in the range

101 * @param path path which has to be matched by the image files in the range

102 * @param start_index minimum accepted value for the first index in the range

103 * @return -1 if no image file could be found

104 */

105 static int find_image_range(int *pfirst_index, int *plast_index,

106 const char *path, int start_index, int start_index_range)

107 {

108 char buf[1024];

109 int range, last_index, range1, first_index;

110

111 /* find the first image */

112 for (first_index = start_index; first_index < start_index + start_index_range; first_index++) {

113 if (av_get_frame_filename(buf, sizeof(buf), path, first_index) < 0) {

114 *pfirst_index =

115 *plast_index = 1;

116 if (avio_check(buf, AVIO_FLAG_READ) > 0)

117 return 0;

118 return -1;

119 }

120 if (avio_check(buf, AVIO_FLAG_READ) > 0)

121 break;

122 }

123 if (first_index == start_index + start_index_range)

124 goto fail;

125

126 /* find the last image */

127 last_index = first_index;

128 for (;;) {

129 range = 0;

130 for (;;) {

131 if (!range)

132 range1 = 1;

133 else

134 range1 = 2 * range;

135 if (av_get_frame_filename(buf, sizeof(buf), path,

136 last_index + range1) < 0)

137 goto fail;

138 if (avio_check(buf, AVIO_FLAG_READ) <= 0)

139 break;

140 range = range1;

141 /* just in case... */

142 if (range >= (1 << 30))

143 goto fail;

144 }

145 /* we are sure than image last_index + range exists */

146 if (!range)

147 break;

148 last_index += range;

149 }

150 *pfirst_index = first_index;

151 *plast_index = last_index;

152 return 0;

153

154 fail:

155 return -1;

156 }

157

158 static int img_read_probe(AVProbeData *p)

159 {

160 if (p->filename && ff_guess_image2_codec(p->filename)) {

161 if (av_filename_number_test(p->filename))

162 return AVPROBE_SCORE_MAX;

163 else if (is_glob(p->filename))

164 return AVPROBE_SCORE_MAX;

165 else if (av_match_ext(p->filename, "raw") || av_match_ext(p->filename, "gif"))

166 return 5;

167 else

168 return AVPROBE_SCORE_EXTENSION;

169 }

170 return 0;

171 }

172

173 int ff_img_read_header(AVFormatContext *s1)

174 {

175 VideoDemuxData *s = s1->priv_data;

176 int first_index, last_index;

177 AVStream *st;

178 enum AVPixelFormat pix_fmt = AV_PIX_FMT_NONE;

179

180 s1->ctx_flags |= AVFMTCTX_NOHEADER;

181

182 st = avformat_new_stream(s1, NULL);

183 if (!st) {

184 return AVERROR(ENOMEM);

185 }

186

187 if (s->pixel_format &&

188 (pix_fmt = av_get_pix_fmt(s->pixel_format)) == AV_PIX_FMT_NONE) {

189 av_log(s1, AV_LOG_ERROR, "No such pixel format: %s.\n",

190 s->pixel_format);

191 return AVERROR(EINVAL);

192 }

193

194 av_strlcpy(s->path, s1->filename, sizeof(s->path));

195 s->img_number = 0;

196 s->img_count = 0;

197

198 /* find format */

199 if (s1->iformat->flags & AVFMT_NOFILE)

200 s->is_pipe = 0;

201 else {

202 s->is_pipe = 1;

203 st->need_parsing = AVSTREAM_PARSE_FULL;

204 }

205

206 if (s->ts_from_file == 2) {

207 #if !HAVE_STRUCT_STAT_ST_MTIM_TV_NSEC

208 av_log(s1, AV_LOG_ERROR, "POSIX.1-2008 not supported, nanosecond file timestamps unavailable\n");

209 return AVERROR(ENOSYS);

210 #endif

211 avpriv_set_pts_info(st, 64, 1, 1000000000);

212 } else if (s->ts_from_file)

213 avpriv_set_pts_info(st, 64, 1, 1);

214 else

215 avpriv_set_pts_info(st, 64, s->framerate.den, s->framerate.num);

216

217 if (s->width && s->height) {

218 st->codec->width = s->width;

219 st->codec->height = s->height;

220 }

221

222 if (!s->is_pipe) {

223 if (s->pattern_type == PT_GLOB_SEQUENCE) {

224 s->use_glob = is_glob(s->path);

225 if (s->use_glob) {

226 char *p = s->path, *q, *dup;

227 int gerr;

228

229 av_log(s1, AV_LOG_WARNING, "Pattern type 'glob_sequence' is deprecated: "

230 "use pattern_type 'glob' instead\n");

231 #if HAVE_GLOB

232 dup = q = av_strdup(p);

233 while (*q) {

234 /* Do we have room for the next char and a \ insertion? */

235 if ((p - s->path) >= (sizeof(s->path) - 2))

236 break;

237 if (*q == '%' && strspn(q + 1, "%*?[]{}"))

238 ++q;

239 else if (strspn(q, "\\*?[]{}"))

240 *p++ = '\\';

241 *p++ = *q++;

242 }

243 *p = 0;

244 av_free(dup);

245

246 gerr = glob(s->path, GLOB_NOCHECK|GLOB_BRACE|GLOB_NOMAGIC, NULL, &s->globstate);

247 if (gerr != 0) {

248 return AVERROR(ENOENT);

249 }

250 first_index = 0;

251 last_index = s->globstate.gl_pathc - 1;

252 #endif

253 }

254 }

255 if ((s->pattern_type == PT_GLOB_SEQUENCE && !s->use_glob) || s->pattern_type == PT_SEQUENCE) {

256 if (find_image_range(&first_index, &last_index, s->path,

257 s->start_number, s->start_number_range) < 0) {

258 av_log(s1, AV_LOG_ERROR,

259 "Could find no file with path '%s' and index in the range %d-%d\n",

260 s->path, s->start_number, s->start_number + s->start_number_range - 1);

261 return AVERROR(ENOENT);

262 }

263 } else if (s->pattern_type == PT_GLOB) {

264 #if HAVE_GLOB

265 int gerr;

266 gerr = glob(s->path, GLOB_NOCHECK|GLOB_BRACE|GLOB_NOMAGIC, NULL, &s->globstate);

267 if (gerr != 0) {

268 return AVERROR(ENOENT);

269 }

270 first_index = 0;

271 last_index = s->globstate.gl_pathc - 1;

272 s->use_glob = 1;

273 #else

274 av_log(s1, AV_LOG_ERROR,

275 "Pattern type 'glob' was selected but globbing "

276 "is not supported by this libavformat build\n");

277 return AVERROR(ENOSYS);

278 #endif

279 } else if (s->pattern_type != PT_GLOB_SEQUENCE) {

280 av_log(s1, AV_LOG_ERROR,

281 "Unknown value '%d' for pattern_type option\n", s->pattern_type);

282 return AVERROR(EINVAL);

283 }

284 s->img_first = first_index;

285 s->img_last = last_index;

286 s->img_number = first_index;

287 /* compute duration */

288 if (!s->ts_from_file) {

289 st->start_time = 0;

290 st->duration = last_index - first_index + 1;

291 }

292 }

293

294 if (s1->video_codec_id) {

295 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;

296 st->codec->codec_id = s1->video_codec_id;

297 } else if (s1->audio_codec_id) {

298 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;

299 st->codec->codec_id = s1->audio_codec_id;

300 } else if (s1->iformat->raw_codec_id) {

301 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;

302 st->codec->codec_id = s1->iformat->raw_codec_id;

303 } else {

304 const char *str = strrchr(s->path, '.');

305 s->split_planes = str && !av_strcasecmp(str + 1, "y");

306 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;

307 if (s1->pb) {

308 int probe_buffer_size = 2048;

309 uint8_t *probe_buffer = av_realloc(NULL, probe_buffer_size + AVPROBE_PADDING_SIZE);

310 AVInputFormat *fmt = NULL;

311 AVProbeData pd;

312

313 if (!probe_buffer)

314 return AVERROR(ENOMEM);

315

316 probe_buffer_size = avio_read(s1->pb, probe_buffer, probe_buffer_size);

317 if (probe_buffer_size < 0) {

318 av_free(probe_buffer);

319 return probe_buffer_size;

320 }

321 memset(probe_buffer + probe_buffer_size, 0, AVPROBE_PADDING_SIZE);

322

323 pd.buf = probe_buffer;

324 pd.buf_size = probe_buffer_size;

325 pd.filename = s1->filename;

326

327 while ((fmt = av_iformat_next(fmt))) {

328 if (fmt->read_header != ff_img_read_header ||

329 !fmt->read_probe ||

330 (fmt->flags & AVFMT_NOFILE) ||

331 !fmt->raw_codec_id)

332 continue;

333 if (fmt->read_probe(&pd) > 0) {

334 st->codec->codec_id = fmt->raw_codec_id;

335 break;

336 }

337 }

338 ffio_rewind_with_probe_data(s1->pb, &probe_buffer, probe_buffer_size);

339 }

340 if (st->codec->codec_id == AV_CODEC_ID_NONE)

341 st->codec->codec_id = ff_guess_image2_codec(s->path);

342 if (st->codec->codec_id == AV_CODEC_ID_LJPEG)

343 st->codec->codec_id = AV_CODEC_ID_MJPEG;

344 if (st->codec->codec_id == AV_CODEC_ID_ALIAS_PIX) // we cannot distingiush this from BRENDER_PIX

345 st->codec->codec_id = AV_CODEC_ID_NONE;

346 }

347 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&

348 pix_fmt != AV_PIX_FMT_NONE)

349 st->codec->pix_fmt = pix_fmt;

350

351 return 0;

352 }

353

354 int ff_img_read_packet(AVFormatContext *s1, AVPacket *pkt)

355 {

356 VideoDemuxData *s = s1->priv_data;

357 char filename_bytes[1024];

358 char *filename = filename_bytes;

359 int i;

360 int size[3] = { 0 }, ret[3] = { 0 };

361 AVIOContext *f[3] = { NULL };

362 AVCodecContext *codec = s1->streams[0]->codec;

363

364 if (!s->is_pipe) {

365 /* loop over input */

366 if (s->loop && s->img_number > s->img_last) {

367 s->img_number = s->img_first;

368 }

369 if (s->img_number > s->img_last)

370 return AVERROR_EOF;

371 if (s->use_glob) {

372 #if HAVE_GLOB

373 filename = s->globstate.gl_pathv[s->img_number];

374 #endif

375 } else {

376 if (av_get_frame_filename(filename_bytes, sizeof(filename_bytes),

377 s->path,

378 s->img_number) < 0 && s->img_number > 1)

379 return AVERROR(EIO);

380 }

381 for (i = 0; i < 3; i++) {

382 if (avio_open2(&f[i], filename, AVIO_FLAG_READ,

383 &s1->interrupt_callback, NULL) < 0) {

384 if (i >= 1)

385 break;

386 av_log(s1, AV_LOG_ERROR, "Could not open file : %s\n",

387 filename);

388 return AVERROR(EIO);

389 }

390 size[i] = avio_size(f[i]);

391

392 if (!s->split_planes)

393 break;

394 filename[strlen(filename) - 1] = 'U' + i;

395 }

396

397 if (codec->codec_id == AV_CODEC_ID_NONE) {

398 AVProbeData pd;

399 AVInputFormat *ifmt;

400 uint8_t header[PROBE_BUF_MIN + AVPROBE_PADDING_SIZE];

401 int ret;

402 int score = 0;

403

404 ret = avio_read(f[0], header, PROBE_BUF_MIN);

405 if (ret < 0)

406 return ret;

407 memset(header + ret, 0, sizeof(header) - ret);

408 avio_skip(f[0], -ret);

409 pd.buf = header;

410 pd.buf_size = ret;

411 pd.filename = filename;

412

413 ifmt = av_probe_input_format3(&pd, 1, &score);

414 if (ifmt && ifmt->read_packet == ff_img_read_packet && ifmt->raw_codec_id)

415 codec->codec_id = ifmt->raw_codec_id;

416 }

417

418 if (codec->codec_id == AV_CODEC_ID_RAWVIDEO && !codec->width)

419 infer_size(&codec->width, &codec->height, size[0]);

420 } else {

421 f[0] = s1->pb;

422 if (url_feof(f[0]))

423 return AVERROR(EIO);

424 if (s->frame_size > 0) {

425 size[0] = s->frame_size;

426 } else if (!s1->streams[0]->parser) {

427 size[0] = avio_size(s1->pb);

428 } else {

429 size[0] = 4096;

430 }

431 }

432

433 if (av_new_packet(pkt, size[0] + size[1] + size[2]) < 0)

434 return AVERROR(ENOMEM);

435 pkt->stream_index = 0;

436 pkt->flags |= AV_PKT_FLAG_KEY;

437 if (s->ts_from_file) {

438 struct stat img_stat;

439 if (stat(filename, &img_stat))

440 return AVERROR(EIO);

441 pkt->pts = (int64_t)img_stat.st_mtime;

442 #if HAVE_STRUCT_STAT_ST_MTIM_TV_NSEC

443 if (s->ts_from_file == 2)

444 pkt->pts = 1000000000*pkt->pts + img_stat.st_mtim.tv_nsec;

445 #endif

446 av_add_index_entry(s1->streams[0], s->img_number, pkt->pts, 0, 0, AVINDEX_KEYFRAME);

447 } else if (!s->is_pipe) {

448 pkt->pts = s->pts;

449 }

450

451 pkt->size = 0;

452 for (i = 0; i < 3; i++) {

453 if (f[i]) {

454 ret[i] = avio_read(f[i], pkt->data + pkt->size, size[i]);

455 if (!s->is_pipe)

456 avio_close(f[i]);

457 if (ret[i] > 0)

458 pkt->size += ret[i];

459 }

460 }

461

462 if (ret[0] <= 0 || ret[1] < 0 || ret[2] < 0) {

463 av_free_packet(pkt);

464 return AVERROR(EIO); /* signal EOF */

465 } else {

466 s->img_count++;

467 s->img_number++;

468 s->pts++;

469 return 0;

470 }

471 }

472

473 static int img_read_close(struct AVFormatContext* s1)

474 {

475 VideoDemuxData *s = s1->priv_data;

476 #if HAVE_GLOB

477 if (s->use_glob) {

478 globfree(&s->globstate);

479 }

480 #endif

481 return 0;

482 }

483

484 static int img_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)

485 {

486 VideoDemuxData *s1 = s->priv_data;

487 AVStream *st = s->streams[0];

488

489 if (s1->ts_from_file) {

490 int index = av_index_search_timestamp(st, timestamp, flags);

491 if(index < 0)

492 return -1;

493 s1->img_number = st->index_entries[index].pos;

494 return 0;

495 }

496

497 if (timestamp < 0 || !s1->loop && timestamp > s1->img_last - s1->img_first)

498 return -1;

499 s1->img_number = timestamp%(s1->img_last - s1->img_first + 1) + s1->img_first;

500 s1->pts = timestamp;

501 return 0;

502 }

503

504 #define OFFSET(x) offsetof(VideoDemuxData, x)

505 #define DEC AV_OPT_FLAG_DECODING_PARAM

506 static const AVOption options[] = {

507 { "framerate", "set the video framerate", OFFSET(framerate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, 0, DEC },

508 { "loop", "force loop over input file sequence", OFFSET(loop), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, 1, DEC },

509

510 { "pattern_type", "set pattern type", OFFSET(pattern_type), AV_OPT_TYPE_INT, {.i64=PT_GLOB_SEQUENCE}, 0, INT_MAX, DEC, "pattern_type"},

511 { "glob_sequence","select glob/sequence pattern type", 0, AV_OPT_TYPE_CONST, {.i64=PT_GLOB_SEQUENCE}, INT_MIN, INT_MAX, DEC, "pattern_type" },

512 { "glob", "select glob pattern type", 0, AV_OPT_TYPE_CONST, {.i64=PT_GLOB }, INT_MIN, INT_MAX, DEC, "pattern_type" },

513 { "sequence", "select sequence pattern type", 0, AV_OPT_TYPE_CONST, {.i64=PT_SEQUENCE }, INT_MIN, INT_MAX, DEC, "pattern_type" },

514

515 { "pixel_format", "set video pixel format", OFFSET(pixel_format), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },

516 { "start_number", "set first number in the sequence", OFFSET(start_number), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, DEC },

517 { "start_number_range", "set range for looking at the first sequence number", OFFSET(start_number_range), AV_OPT_TYPE_INT, {.i64 = 5}, 1, INT_MAX, DEC },

518 { "video_size", "set video size", OFFSET(width), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, DEC },

519 { "frame_size", "force frame size in bytes", OFFSET(frame_size), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, DEC },

520 { "ts_from_file", "set frame timestamp from file's one", OFFSET(ts_from_file), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, 2, DEC, "ts_type" },

521 { "none", "none", 0, AV_OPT_TYPE_CONST, {.i64 = 0 }, 0, 2, DEC, "ts_type" },

522 { "sec", "second precision", 0, AV_OPT_TYPE_CONST, {.i64 = 1 }, 0, 2, DEC, "ts_type" },

523 { "ns", "nano second precision", 0, AV_OPT_TYPE_CONST, {.i64 = 2 }, 0, 2, DEC, "ts_type" },

524 { NULL },

525 };

526

527 #if CONFIG_IMAGE2_DEMUXER

528 static const AVClass img2_class = {

529 .class_name = "image2 demuxer",

530 .item_name = av_default_item_name,

531 .option = options,

532 .version = LIBAVUTIL_VERSION_INT,

533 };

534 AVInputFormat ff_image2_demuxer = {

535 .name = "image2",

536 .long_name = NULL_IF_CONFIG_SMALL("image2 sequence"),

537 .priv_data_size = sizeof(VideoDemuxData),

538 .read_probe = img_read_probe,

539 .read_header = ff_img_read_header,

540 .read_packet = ff_img_read_packet,

541 .read_close = img_read_close,

542 .read_seek = img_read_seek,

543 .flags = AVFMT_NOFILE,

544 .priv_class = &img2_class,

545 };

546 #endif

547 #if CONFIG_IMAGE2PIPE_DEMUXER

548 static const AVClass img2pipe_class = {

549 .class_name = "image2pipe demuxer",

550 .item_name = av_default_item_name,

551 .option = options,

552 .version = LIBAVUTIL_VERSION_INT,

553 };

554 AVInputFormat ff_image2pipe_demuxer = {

555 .name = "image2pipe",

556 .long_name = NULL_IF_CONFIG_SMALL("piped image2 sequence"),

557 .priv_data_size = sizeof(VideoDemuxData),

558 .read_header = ff_img_read_header,

559 .read_packet = ff_img_read_packet,

560 .priv_class = &img2pipe_class,

561 };

562 #endif

563

564 static int bmp_probe(AVProbeData *p)

565 {

566 const uint8_t *b = p->buf;

567 int ihsize;

568

569 if (AV_RB16(b) != 0x424d)

570 return 0;

571

572 ihsize = AV_RL32(b+14);

573 if (ihsize < 12 || ihsize > 255)

574 return 0;

575

576 if (!AV_RN32(b + 6)) {

577 return AVPROBE_SCORE_EXTENSION + 1;

578 } else {

579 return AVPROBE_SCORE_EXTENSION / 4;

580 }

581 return 0;

582 }

583

584 static int dpx_probe(AVProbeData *p)

585 {

586 const uint8_t *b = p->buf;

587

588 if (AV_RN32(b) == AV_RN32("SDPX") || AV_RN32(b) == AV_RN32("XPDS"))

589 return AVPROBE_SCORE_EXTENSION + 1;

590 return 0;

591 }

592

593 static int exr_probe(AVProbeData *p)

594 {

595 const uint8_t *b = p->buf;

596

597 if (AV_RL32(b) == 20000630)

598 return AVPROBE_SCORE_EXTENSION + 1;

599 return 0;

600 }

601

602 static int j2k_probe(AVProbeData *p)

603 {

604 const uint8_t *b = p->buf;

605

606 if (AV_RB64(b) == 0x0000000c6a502020 ||

607 AV_RB32(b) == 0xff4fff51)

608 return AVPROBE_SCORE_EXTENSION + 1;

609 return 0;

610 }

611

612 static int pictor_probe(AVProbeData *p)

613 {

614 const uint8_t *b = p->buf;

615

616 if (AV_RL16(b) == 0x1234)

617 return AVPROBE_SCORE_EXTENSION / 4;

618 return 0;

619 }

620

621 static int png_probe(AVProbeData *p)

622 {

623 const uint8_t *b = p->buf;

624

625 if (AV_RB64(b) == 0x89504e470d0a1a0a)

626 return AVPROBE_SCORE_MAX - 1;

627 return 0;

628 }

629

630 static int sgi_probe(AVProbeData *p)

631 {

632 const uint8_t *b = p->buf;

633

634 if (AV_RB16(b) == 474 &&

635 (b[2] & ~1) == 0 &&

636 (b[3] & ~3) == 0 && b[3] &&

637 (AV_RB16(b + 4) & ~7) == 0 && AV_RB16(b + 4))

638 return AVPROBE_SCORE_EXTENSION + 1;

639 return 0;

640 }

641

642 static int sunrast_probe(AVProbeData *p)

643 {

644 const uint8_t *b = p->buf;

645

646 if (AV_RB32(b) == 0x59a66a95)

647 return AVPROBE_SCORE_EXTENSION + 1;

648 return 0;

649 }

650

651 static int tiff_probe(AVProbeData *p)

652 {

653 const uint8_t *b = p->buf;

654

655 if (AV_RB32(b) == 0x49492a00)

656 return AVPROBE_SCORE_EXTENSION + 1;

657 return 0;

658 }

659

660 #define IMAGEAUTO_DEMUXER(imgname, codecid)\

661 static const AVClass imgname ## _class = {\

662 .class_name = AV_STRINGIFY(imgname) " demuxer",\

663 .item_name = av_default_item_name,\

664 .option = options,\

665 .version = LIBAVUTIL_VERSION_INT,\

666 };\

667 AVInputFormat ff_image_ ## imgname ## _pipe_demuxer = {\

668 .name = AV_STRINGIFY(imgname) "_pipe",\

669 .priv_data_size = sizeof(VideoDemuxData),\

670 .read_probe = imgname ## _probe,\

671 .read_header = ff_img_read_header,\

672 .read_packet = ff_img_read_packet,\

673 .priv_class = & imgname ## _class,\

674 .raw_codec_id = codecid,\

675 };

676

677 IMAGEAUTO_DEMUXER(bmp, AV_CODEC_ID_BMP)

678 IMAGEAUTO_DEMUXER(dpx, AV_CODEC_ID_DPX)

679 IMAGEAUTO_DEMUXER(exr, AV_CODEC_ID_EXR)

680 IMAGEAUTO_DEMUXER(j2k, AV_CODEC_ID_JPEG2000)

681 IMAGEAUTO_DEMUXER(pictor, AV_CODEC_ID_PICTOR)

682 IMAGEAUTO_DEMUXER(png, AV_CODEC_ID_PNG)

683 IMAGEAUTO_DEMUXER(sgi, AV_CODEC_ID_SGI)

684 IMAGEAUTO_DEMUXER(sunrast, AV_CODEC_ID_SUNRAST)

685 IMAGEAUTO_DEMUXER(tiff, AV_CODEC_ID_TIFF)

Generated on Sun Jul 20 2014 23:06:03 for FFmpeg by doxygen 1.8.2