FFmpeg: libavformat/avidec.c Source File

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libavformat

avidec.c

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1 /*

2 * AVI demuxer

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 "libavutil/intreadwrite.h"

23 #include "libavutil/mathematics.h"

24 #include "libavutil/bswap.h"

25 #include "libavutil/opt.h"

26 #include "libavutil/dict.h"

27 #include "libavutil/avstring.h"

28 #include "libavutil/avassert.h"

29 #include "avformat.h"

30 #include "internal.h"

31 #include "avi.h"

32 #include "dv.h"

33 #include "riff.h"

35 typedef struct AVIStream {

36 int64_t frame_offset; /* current frame (video) or byte (audio) counter

37 (used to compute the pts) */

38 int remaining;

39 int packet_size;

41 uint32_t scale;

42 uint32_t rate;

43 int sample_size; /* size of one sample (or packet) (in the rate/scale sense) in bytes */

45 int64_t cum_len; /* temporary storage (used during seek) */

47 int prefix; ///< normally 'd'<<8 + 'c' or 'w'<<8 + 'b'

48 int prefix_count;

49 uint32_t pal[256];

50 int has_pal;

51 int dshow_block_align; ///< block align variable used to emulate bugs in the MS dshow demuxer

53 AVFormatContext *sub_ctx;

54 AVPacket sub_pkt;

55 uint8_t *sub_buffer;

57 int64_t seek_pos;

58 } AVIStream;

60 typedef struct {

61 const AVClass *class;

62 int64_t riff_end;

63 int64_t movi_end;

64 int64_t fsize;

65 int64_t io_fsize;

66 int64_t movi_list;

67 int64_t last_pkt_pos;

68 int index_loaded;

69 int is_odml;

70 int non_interleaved;

71 int stream_index;

72 DVDemuxContext* dv_demux;

73 int odml_depth;

74 int use_odml;

75 #define MAX_ODML_DEPTH 1000

76 int64_t dts_max;

77 } AVIContext;

80 static const AVOption options[] = {

81 { "use_odml", "use odml index", offsetof(AVIContext, use_odml), AV_OPT_TYPE_INT, {.i64 = 1}, -1, 1, AV_OPT_FLAG_DECODING_PARAM},

82 { NULL },

83 };

85 static const AVClass demuxer_class = {

86 .class_name = "avi",

87 .item_name = av_default_item_name,

88 .option = options,

89 .version = LIBAVUTIL_VERSION_INT,

90 .category = AV_CLASS_CATEGORY_DEMUXER,

91 };

94 static const char avi_headers[][8] = {

95 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', ' ' },

96 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 'X' },

97 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 0x19},

98 { 'O', 'N', '2', ' ', 'O', 'N', '2', 'f' },

99 { 'R', 'I', 'F', 'F', 'A', 'M', 'V', ' ' },

100 { 0 }

101 };

102

103 static const AVMetadataConv avi_metadata_conv[] = {

104 { "strn", "title" },

105 { 0 },

106 };

107

108 static int avi_load_index(AVFormatContext *s);

109 static int guess_ni_flag(AVFormatContext *s);

110

111 #define print_tag(str, tag, size) \

112 av_dlog(NULL, "%s: tag=%c%c%c%c size=0x%x\n", \

113 str, tag & 0xff, \

114 (tag >> 8) & 0xff, \

115 (tag >> 16) & 0xff, \

116 (tag >> 24) & 0xff, \

117 size)

118

119 static inline int get_duration(AVIStream *ast, int len){

120 if(ast->sample_size){

121 return len;

122 }else if (ast->dshow_block_align){

123 return (len + ast->dshow_block_align - 1)/ast->dshow_block_align;

124 }else

125 return 1;

126 }

127

128 static int get_riff(AVFormatContext *s, AVIOContext *pb)

129 {

130 AVIContext *avi = s->priv_data;

131 char header[8];

132 int i;

133

134 /* check RIFF header */

135 avio_read(pb, header, 4);

136 avi->riff_end = avio_rl32(pb); /* RIFF chunk size */

137 avi->riff_end += avio_tell(pb); /* RIFF chunk end */

138 avio_read(pb, header+4, 4);

139

140 for(i=0; avi_headers[i][0]; i++)

141 if(!memcmp(header, avi_headers[i], 8))

142 break;

143 if(!avi_headers[i][0])

144 return AVERROR_INVALIDDATA;

145

146 if(header[7] == 0x19)

147 av_log(s, AV_LOG_INFO, "This file has been generated by a totally broken muxer.\n");

148

149 return 0;

150 }

151

152 static int read_braindead_odml_indx(AVFormatContext *s, int frame_num){

153 AVIContext *avi = s->priv_data;

154 AVIOContext *pb = s->pb;

155 int longs_pre_entry= avio_rl16(pb);

156 int index_sub_type = avio_r8(pb);

157 int index_type = avio_r8(pb);

158 int entries_in_use = avio_rl32(pb);

159 int chunk_id = avio_rl32(pb);

160 int64_t base = avio_rl64(pb);

161 int stream_id= 10*((chunk_id&0xFF) - '0') + (((chunk_id>>8)&0xFF) - '0');

162 AVStream *st;

163 AVIStream *ast;

164 int i;

165 int64_t last_pos= -1;

166 int64_t filesize= avi->fsize;

167

168 av_dlog(s, "longs_pre_entry:%d index_type:%d entries_in_use:%d chunk_id:%X base:%16"PRIX64"\n",

169 longs_pre_entry,index_type, entries_in_use, chunk_id, base);

170

171 if(stream_id >= s->nb_streams || stream_id < 0)

172 return AVERROR_INVALIDDATA;

173 st= s->streams[stream_id];

174 ast = st->priv_data;

175

176 if(index_sub_type)

177 return AVERROR_INVALIDDATA;

178

179 avio_rl32(pb);

180

181 if(index_type && longs_pre_entry != 2)

182 return AVERROR_INVALIDDATA;

183 if(index_type>1)

184 return AVERROR_INVALIDDATA;

185

186 if(filesize > 0 && base >= filesize){

187 av_log(s, AV_LOG_ERROR, "ODML index invalid\n");

188 if(base>>32 == (base & 0xFFFFFFFF) && (base & 0xFFFFFFFF) < filesize && filesize <= 0xFFFFFFFF)

189 base &= 0xFFFFFFFF;

190 else

191 return AVERROR_INVALIDDATA;

192 }

193

194 for(i=0; i<entries_in_use; i++){

195 if(index_type){

196 int64_t pos= avio_rl32(pb) + base - 8;

197 int len = avio_rl32(pb);

198 int key= len >= 0;

199 len &= 0x7FFFFFFF;

200

201 #ifdef DEBUG_SEEK

202 av_log(s, AV_LOG_ERROR, "pos:%"PRId64", len:%X\n", pos, len);

203 #endif

204 if(url_feof(pb))

205 return AVERROR_INVALIDDATA;

206

207 if(last_pos == pos || pos == base - 8)

208 avi->non_interleaved= 1;

209 if(last_pos != pos && (len || !ast->sample_size))

210 av_add_index_entry(st, pos, ast->cum_len, len, 0, key ? AVINDEX_KEYFRAME : 0);

211

212 ast->cum_len += get_duration(ast, len);

213 last_pos= pos;

214 }else{

215 int64_t offset, pos;

216 int duration;

217 offset = avio_rl64(pb);

218 avio_rl32(pb); /* size */

219 duration = avio_rl32(pb);

220

221 if(url_feof(pb))

222 return AVERROR_INVALIDDATA;

223

224 pos = avio_tell(pb);

225

226 if(avi->odml_depth > MAX_ODML_DEPTH){

227 av_log(s, AV_LOG_ERROR, "Too deeply nested ODML indexes\n");

228 return AVERROR_INVALIDDATA;

229 }

230

231 if(avio_seek(pb, offset+8, SEEK_SET) < 0)

232 return -1;

233 avi->odml_depth++;

234 read_braindead_odml_indx(s, frame_num);

235 avi->odml_depth--;

236 frame_num += duration;

237

238 if(avio_seek(pb, pos, SEEK_SET) < 0) {

239 av_log(s, AV_LOG_ERROR, "Failed to restore position after reading index\n");

240 return -1;

241 }

242

243 }

244 }

245 avi->index_loaded=2;

246 return 0;

247 }

248

249 static void clean_index(AVFormatContext *s){

250 int i;

251 int64_t j;

252

253 for(i=0; i<s->nb_streams; i++){

254 AVStream *st = s->streams[i];

255 AVIStream *ast = st->priv_data;

256 int n= st->nb_index_entries;

257 int max= ast->sample_size;

258 int64_t pos, size, ts;

259

260 if(n != 1 || ast->sample_size==0)

261 continue;

262

263 while(max < 1024) max+=max;

264

265 pos= st->index_entries[0].pos;

266 size= st->index_entries[0].size;

267 ts= st->index_entries[0].timestamp;

268

269 for(j=0; j<size; j+=max){

270 av_add_index_entry(st, pos+j, ts+j, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME);

271 }

272 }

273 }

274

275 static int avi_read_tag(AVFormatContext *s, AVStream *st, uint32_t tag, uint32_t size)

276 {

277 AVIOContext *pb = s->pb;

278 char key[5] = {0}, *value;

279

280 size += (size & 1);

281

282 if (size == UINT_MAX)

283 return AVERROR(EINVAL);

284 value = av_malloc(size+1);

285 if (!value)

286 return AVERROR(ENOMEM);

287 avio_read(pb, value, size);

288 value[size]=0;

289

290 AV_WL32(key, tag);

291

292 return av_dict_set(st ? &st->metadata : &s->metadata, key, value,

293 AV_DICT_DONT_STRDUP_VAL);

294 }

295

296 static const char months[12][4] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",

297 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };

298

299 static void avi_metadata_creation_time(AVDictionary **metadata, char *date)

300 {

301 char month[4], time[9], buffer[64];

302 int i, day, year;

303 /* parse standard AVI date format (ie. "Mon Mar 10 15:04:43 2003") */

304 if (sscanf(date, "%*3s%*[ ]%3s%*[ ]%2d%*[ ]%8s%*[ ]%4d",

305 month, &day, time, &year) == 4) {

306 for (i=0; i<12; i++)

307 if (!av_strcasecmp(month, months[i])) {

308 snprintf(buffer, sizeof(buffer), "%.4d-%.2d-%.2d %s",

309 year, i+1, day, time);

310 av_dict_set(metadata, "creation_time", buffer, 0);

311 }

312 } else if (date[4] == '/' && date[7] == '/') {

313 date[4] = date[7] = '-';

314 av_dict_set(metadata, "creation_time", date, 0);

315 }

316 }

317

318 static void avi_read_nikon(AVFormatContext *s, uint64_t end)

319 {

320 while (avio_tell(s->pb) < end) {

321 uint32_t tag = avio_rl32(s->pb);

322 uint32_t size = avio_rl32(s->pb);

323 switch (tag) {

324 case MKTAG('n', 'c', 't', 'g'): { /* Nikon Tags */

325 uint64_t tag_end = avio_tell(s->pb) + size;

326 while (avio_tell(s->pb) < tag_end) {

327 uint16_t tag = avio_rl16(s->pb);

328 uint16_t size = avio_rl16(s->pb);

329 const char *name = NULL;

330 char buffer[64] = {0};

331 size -= avio_read(s->pb, buffer,

332 FFMIN(size, sizeof(buffer)-1));

333 switch (tag) {

334 case 0x03: name = "maker"; break;

335 case 0x04: name = "model"; break;

336 case 0x13: name = "creation_time";

337 if (buffer[4] == ':' && buffer[7] == ':')

338 buffer[4] = buffer[7] = '-';

339 break;

340 }

341 if (name)

342 av_dict_set(&s->metadata, name, buffer, 0);

343 avio_skip(s->pb, size);

344 }

345 break;

346 }

347 default:

348 avio_skip(s->pb, size);

349 break;

350 }

351 }

352 }

353

354 static int avi_read_header(AVFormatContext *s)

355 {

356 AVIContext *avi = s->priv_data;

357 AVIOContext *pb = s->pb;

358 unsigned int tag, tag1, handler;

359 int codec_type, stream_index, frame_period;

360 unsigned int size;

361 int i;

362 AVStream *st;

363 AVIStream *ast = NULL;

364 int avih_width=0, avih_height=0;

365 int amv_file_format=0;

366 uint64_t list_end = 0;

367 int ret;

368 AVDictionaryEntry *dict_entry;

369

370 avi->stream_index= -1;

371

372 ret = get_riff(s, pb);

373 if (ret < 0)

374 return ret;

375

376 av_log(avi, AV_LOG_DEBUG, "use odml:%d\n", avi->use_odml);

377

378 avi->io_fsize = avi->fsize = avio_size(pb);

379 if(avi->fsize<=0 || avi->fsize < avi->riff_end)

380 avi->fsize= avi->riff_end == 8 ? INT64_MAX : avi->riff_end;

381

382 /* first list tag */

383 stream_index = -1;

384 codec_type = -1;

385 frame_period = 0;

386 for(;;) {

387 if (url_feof(pb))

388 goto fail;

389 tag = avio_rl32(pb);

390 size = avio_rl32(pb);

391

392 print_tag("tag", tag, size);

393

394 switch(tag) {

395 case MKTAG('L', 'I', 'S', 'T'):

396 list_end = avio_tell(pb) + size;

397 /* Ignored, except at start of video packets. */

398 tag1 = avio_rl32(pb);

399

400 print_tag("list", tag1, 0);

401

402 if (tag1 == MKTAG('m', 'o', 'v', 'i')) {

403 avi->movi_list = avio_tell(pb) - 4;

404 if(size) avi->movi_end = avi->movi_list + size + (size & 1);

405 else avi->movi_end = avi->fsize;

406 av_dlog(NULL, "movi end=%"PRIx64"\n", avi->movi_end);

407 goto end_of_header;

408 }

409 else if (tag1 == MKTAG('I', 'N', 'F', 'O'))

410 ff_read_riff_info(s, size - 4);

411 else if (tag1 == MKTAG('n', 'c', 'd', 't'))

412 avi_read_nikon(s, list_end);

413

414 break;

415 case MKTAG('I', 'D', 'I', 'T'): {

416 unsigned char date[64] = {0};

417 size += (size & 1);

418 size -= avio_read(pb, date, FFMIN(size, sizeof(date)-1));

419 avio_skip(pb, size);

420 avi_metadata_creation_time(&s->metadata, date);

421 break;

422 }

423 case MKTAG('d', 'm', 'l', 'h'):

424 avi->is_odml = 1;

425 avio_skip(pb, size + (size & 1));

426 break;

427 case MKTAG('a', 'm', 'v', 'h'):

428 amv_file_format=1;

429 case MKTAG('a', 'v', 'i', 'h'):

430 /* AVI header */

431 /* using frame_period is bad idea */

432 frame_period = avio_rl32(pb);

433 avio_rl32(pb); /* max. bytes per second */

434 avio_rl32(pb);

435 avi->non_interleaved |= avio_rl32(pb) & AVIF_MUSTUSEINDEX;

436

437 avio_skip(pb, 2 * 4);

438 avio_rl32(pb);

439 avio_rl32(pb);

440 avih_width=avio_rl32(pb);

441 avih_height=avio_rl32(pb);

442

443 avio_skip(pb, size - 10 * 4);

444 break;

445 case MKTAG('s', 't', 'r', 'h'):

446 /* stream header */

447

448 tag1 = avio_rl32(pb);

449 handler = avio_rl32(pb); /* codec tag */

450

451 if(tag1 == MKTAG('p', 'a', 'd', 's')){

452 avio_skip(pb, size - 8);

453 break;

454 }else{

455 stream_index++;

456 st = avformat_new_stream(s, NULL);

457 if (!st)

458 goto fail;

459

460 st->id = stream_index;

461 ast = av_mallocz(sizeof(AVIStream));

462 if (!ast)

463 goto fail;

464 st->priv_data = ast;

465 }

466 if(amv_file_format)

467 tag1 = stream_index ? MKTAG('a','u','d','s') : MKTAG('v','i','d','s');

468

469 print_tag("strh", tag1, -1);

470

471 if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){

472 int64_t dv_dur;

473

474 /*

475 * After some consideration -- I don't think we

476 * have to support anything but DV in type1 AVIs.

477 */

478 if (s->nb_streams != 1)

479 goto fail;

480

481 if (handler != MKTAG('d', 'v', 's', 'd') &&

482 handler != MKTAG('d', 'v', 'h', 'd') &&

483 handler != MKTAG('d', 'v', 's', 'l'))

484 goto fail;

485

486 ast = s->streams[0]->priv_data;

487 av_freep(&s->streams[0]->codec->extradata);

488 av_freep(&s->streams[0]->codec);

489 if (s->streams[0]->info)

490 av_freep(&s->streams[0]->info->duration_error);

491 av_freep(&s->streams[0]->info);

492 av_freep(&s->streams[0]);

493 s->nb_streams = 0;

494 if (CONFIG_DV_DEMUXER) {

495 avi->dv_demux = avpriv_dv_init_demux(s);

496 if (!avi->dv_demux)

497 goto fail;

498 }

499 s->streams[0]->priv_data = ast;

500 avio_skip(pb, 3 * 4);

501 ast->scale = avio_rl32(pb);

502 ast->rate = avio_rl32(pb);

503 avio_skip(pb, 4); /* start time */

504

505 dv_dur = avio_rl32(pb);

506 if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {

507 dv_dur *= AV_TIME_BASE;

508 s->duration = av_rescale(dv_dur, ast->scale, ast->rate);

509 }

510 /*

511 * else, leave duration alone; timing estimation in utils.c

512 * will make a guess based on bitrate.

513 */

514

515 stream_index = s->nb_streams - 1;

516 avio_skip(pb, size - 9*4);

517 break;

518 }

519

520 av_assert0(stream_index < s->nb_streams);

521 st->codec->stream_codec_tag= handler;

522

523 avio_rl32(pb); /* flags */

524 avio_rl16(pb); /* priority */

525 avio_rl16(pb); /* language */

526 avio_rl32(pb); /* initial frame */

527 ast->scale = avio_rl32(pb);

528 ast->rate = avio_rl32(pb);

529 if(!(ast->scale && ast->rate)){

530 av_log(s, AV_LOG_WARNING, "scale/rate is %u/%u which is invalid. (This file has been generated by broken software.)\n", ast->scale, ast->rate);

531 if(frame_period){

532 ast->rate = 1000000;

533 ast->scale = frame_period;

534 }else{

535 ast->rate = 25;

536 ast->scale = 1;

537 }

538 }

539 avpriv_set_pts_info(st, 64, ast->scale, ast->rate);

540

541 ast->cum_len=avio_rl32(pb); /* start */

542 st->nb_frames = avio_rl32(pb);

543

544 st->start_time = 0;

545 avio_rl32(pb); /* buffer size */

546 avio_rl32(pb); /* quality */

547 if (ast->cum_len*ast->scale/ast->rate > 3600) {

548 av_log(s, AV_LOG_ERROR, "crazy start time, iam scared, giving up\n");

549 return AVERROR_INVALIDDATA;

550 }

551 ast->sample_size = avio_rl32(pb); /* sample ssize */

552 ast->cum_len *= FFMAX(1, ast->sample_size);

553 av_dlog(s, "%"PRIu32" %"PRIu32" %d\n",

554 ast->rate, ast->scale, ast->sample_size);

555

556 switch(tag1) {

557 case MKTAG('v', 'i', 'd', 's'):

558 codec_type = AVMEDIA_TYPE_VIDEO;

559

560 ast->sample_size = 0;

561 break;

562 case MKTAG('a', 'u', 'd', 's'):

563 codec_type = AVMEDIA_TYPE_AUDIO;

564 break;

565 case MKTAG('t', 'x', 't', 's'):

566 codec_type = AVMEDIA_TYPE_SUBTITLE;

567 break;

568 case MKTAG('d', 'a', 't', 's'):

569 codec_type = AVMEDIA_TYPE_DATA;

570 break;

571 default:

572 av_log(s, AV_LOG_INFO, "unknown stream type %X\n", tag1);

573 }

574 if(ast->sample_size == 0) {

575 st->duration = st->nb_frames;

576 if (st->duration > 0 && avi->io_fsize > 0 && avi->riff_end > avi->io_fsize) {

577 av_log(s, AV_LOG_DEBUG, "File is truncated adjusting duration\n");

578 st->duration = av_rescale(st->duration, avi->io_fsize, avi->riff_end);

579 }

580 }

581 ast->frame_offset= ast->cum_len;

582 avio_skip(pb, size - 12 * 4);

583 break;

584 case MKTAG('s', 't', 'r', 'f'):

585 /* stream header */

586 if (!size)

587 break;

588 if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {

589 avio_skip(pb, size);

590 } else {

591 uint64_t cur_pos = avio_tell(pb);

592 unsigned esize;

593 if (cur_pos < list_end)

594 size = FFMIN(size, list_end - cur_pos);

595 st = s->streams[stream_index];

596 switch(codec_type) {

597 case AVMEDIA_TYPE_VIDEO:

598 if(amv_file_format){

599 st->codec->width=avih_width;

600 st->codec->height=avih_height;

601 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;

602 st->codec->codec_id = AV_CODEC_ID_AMV;

603 avio_skip(pb, size);

604 break;

605 }

606 tag1 = ff_get_bmp_header(pb, st, &esize);

607

608 if (tag1 == MKTAG('D', 'X', 'S', 'B') || tag1 == MKTAG('D','X','S','A')) {

609 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;

610 st->codec->codec_tag = tag1;

611 st->codec->codec_id = AV_CODEC_ID_XSUB;

612 break;

613 }

614

615 if(size > 10*4 && size<(1<<30) && size < avi->fsize){

616 if(esize == size-1 && (esize&1)) st->codec->extradata_size= esize - 10*4;

617 else st->codec->extradata_size= size - 10*4;

618 st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);

619 if (!st->codec->extradata) {

620 st->codec->extradata_size= 0;

621 return AVERROR(ENOMEM);

622 }

623 avio_read(pb, st->codec->extradata, st->codec->extradata_size);

624 }

625

626 if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly

627 avio_r8(pb);

628

629 /* Extract palette from extradata if bpp <= 8. */

630 /* This code assumes that extradata contains only palette. */

631 /* This is true for all paletted codecs implemented in FFmpeg. */

632 if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {

633 int pal_size = (1 << st->codec->bits_per_coded_sample) << 2;

634 const uint8_t *pal_src;

635

636 pal_size = FFMIN(pal_size, st->codec->extradata_size);

637 pal_src = st->codec->extradata + st->codec->extradata_size - pal_size;

638 for (i = 0; i < pal_size/4; i++)

639 ast->pal[i] = 0xFFU<<24 | AV_RL32(pal_src+4*i);

640 ast->has_pal = 1;

641 }

642

643 print_tag("video", tag1, 0);

644

645 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;

646 st->codec->codec_tag = tag1;

647 st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);

648 st->need_parsing = AVSTREAM_PARSE_HEADERS; // This is needed to get the pict type which is necessary for generating correct pts.

649

650 if(st->codec->codec_tag==0 && st->codec->height > 0 && st->codec->extradata_size < 1U<<30){

651 st->codec->extradata_size+= 9;

652 st->codec->extradata= av_realloc_f(st->codec->extradata, 1, st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);

653 if(st->codec->extradata)

654 memcpy(st->codec->extradata + st->codec->extradata_size - 9, "BottomUp", 9);

655 }

656 st->codec->height= FFABS(st->codec->height);

657

658 // avio_skip(pb, size - 5 * 4);

659 break;

660 case AVMEDIA_TYPE_AUDIO:

661 ret = ff_get_wav_header(pb, st->codec, size);

662 if (ret < 0)

663 return ret;

664 ast->dshow_block_align= st->codec->block_align;

665 if(ast->sample_size && st->codec->block_align && ast->sample_size != st->codec->block_align){

666 av_log(s, AV_LOG_WARNING, "sample size (%d) != block align (%d)\n", ast->sample_size, st->codec->block_align);

667 ast->sample_size= st->codec->block_align;

668 }

669 if (size&1) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */

670 avio_skip(pb, 1);

671 /* Force parsing as several audio frames can be in

672 * one packet and timestamps refer to packet start. */

673 st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;

674 /* ADTS header is in extradata, AAC without header must be

675 * stored as exact frames. Parser not needed and it will

676 * fail. */

677 if (st->codec->codec_id == AV_CODEC_ID_AAC && st->codec->extradata_size)

678 st->need_parsing = AVSTREAM_PARSE_NONE;

679 /* AVI files with Xan DPCM audio (wrongly) declare PCM

680 * audio in the header but have Axan as stream_code_tag. */

681 if (st->codec->stream_codec_tag == AV_RL32("Axan")){

682 st->codec->codec_id = AV_CODEC_ID_XAN_DPCM;

683 st->codec->codec_tag = 0;

684 ast->dshow_block_align = 0;

685 }

686 if (amv_file_format){

687 st->codec->codec_id = AV_CODEC_ID_ADPCM_IMA_AMV;

688 ast->dshow_block_align = 0;

689 }

690 if(st->codec->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align <= 4 && ast->dshow_block_align) {

691 av_log(s, AV_LOG_DEBUG, "overriding invalid dshow_block_align of %d\n", ast->dshow_block_align);

692 ast->dshow_block_align = 0;

693 }

694 if(st->codec->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align == 1024 && ast->sample_size == 1024 ||

695 st->codec->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align == 4096 && ast->sample_size == 4096 ||

696 st->codec->codec_id == AV_CODEC_ID_MP3 && ast->dshow_block_align == 1152 && ast->sample_size == 1152) {

697 av_log(s, AV_LOG_DEBUG, "overriding sample_size\n");

698 ast->sample_size = 0;

699 }

700 break;

701 case AVMEDIA_TYPE_SUBTITLE:

702 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;

703 st->request_probe= 1;

704 avio_skip(pb, size);

705 break;

706 default:

707 st->codec->codec_type = AVMEDIA_TYPE_DATA;

708 st->codec->codec_id= AV_CODEC_ID_NONE;

709 st->codec->codec_tag= 0;

710 avio_skip(pb, size);

711 break;

712 }

713 }

714 break;

715 case MKTAG('s', 't', 'r', 'd'):

716 if (stream_index >= (unsigned)s->nb_streams

717 || s->streams[stream_index]->codec->extradata_size

718 || s->streams[stream_index]->codec->codec_tag == MKTAG('H','2','6','4')) {

719 avio_skip(pb, size);

720 } else {

721 uint64_t cur_pos = avio_tell(pb);

722 if (cur_pos < list_end)

723 size = FFMIN(size, list_end - cur_pos);

724 st = s->streams[stream_index];

725

726 if(size<(1<<30)){

727 st->codec->extradata_size= size;

728 st->codec->extradata= av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);

729 if (!st->codec->extradata) {

730 st->codec->extradata_size= 0;

731 return AVERROR(ENOMEM);

732 }

733 avio_read(pb, st->codec->extradata, st->codec->extradata_size);

734 }

735

736 if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly

737 avio_r8(pb);

738 }

739 break;

740 case MKTAG('i', 'n', 'd', 'x'):

741 i= avio_tell(pb);

742 if(pb->seekable && !(s->flags & AVFMT_FLAG_IGNIDX) && avi->use_odml &&

743 read_braindead_odml_indx(s, 0) < 0 && (s->error_recognition & AV_EF_EXPLODE))

744 goto fail;

745 avio_seek(pb, i+size, SEEK_SET);

746 break;

747 case MKTAG('v', 'p', 'r', 'p'):

748 if(stream_index < (unsigned)s->nb_streams && size > 9*4){

749 AVRational active, active_aspect;

750

751 st = s->streams[stream_index];

752 avio_rl32(pb);

753 avio_rl32(pb);

754 avio_rl32(pb);

755 avio_rl32(pb);

756 avio_rl32(pb);

757

758 active_aspect.den= avio_rl16(pb);

759 active_aspect.num= avio_rl16(pb);

760 active.num = avio_rl32(pb);

761 active.den = avio_rl32(pb);

762 avio_rl32(pb); //nbFieldsPerFrame

763

764 if(active_aspect.num && active_aspect.den && active.num && active.den){

765 st->sample_aspect_ratio= av_div_q(active_aspect, active);

766 av_dlog(s, "vprp %d/%d %d/%d\n",

767 active_aspect.num, active_aspect.den,

768 active.num, active.den);

769 }

770 size -= 9*4;

771 }

772 avio_skip(pb, size);

773 break;

774 case MKTAG('s', 't', 'r', 'n'):

775 if(s->nb_streams){

776 ret = avi_read_tag(s, s->streams[s->nb_streams-1], tag, size);

777 if (ret < 0)

778 return ret;

779 break;

780 }

781 default:

782 if(size > 1000000){

783 av_log(s, AV_LOG_ERROR, "Something went wrong during header parsing, "

784 "I will ignore it and try to continue anyway.\n");

785 if (s->error_recognition & AV_EF_EXPLODE)

786 goto fail;

787 avi->movi_list = avio_tell(pb) - 4;

788 avi->movi_end = avi->fsize;

789 goto end_of_header;

790 }

791 /* skip tag */

792 size += (size & 1);

793 avio_skip(pb, size);

794 break;

795 }

796 }

797 end_of_header:

798 /* check stream number */

799 if (stream_index != s->nb_streams - 1) {

800 fail:

801 return AVERROR_INVALIDDATA;

802 }

803

804 if(!avi->index_loaded && pb->seekable)

805 avi_load_index(s);

806 avi->index_loaded |= 1;

807 avi->non_interleaved |= guess_ni_flag(s) | (s->flags & AVFMT_FLAG_SORT_DTS);

808

809 dict_entry = av_dict_get(s->metadata, "ISFT", NULL, 0);

810 if (dict_entry && !strcmp(dict_entry->value, "PotEncoder"))

811 for (i=0; i<s->nb_streams; i++) {

812 AVStream *st = s->streams[i];

813 if ( st->codec->codec_id == AV_CODEC_ID_MPEG1VIDEO

814 || st->codec->codec_id == AV_CODEC_ID_MPEG2VIDEO)

815 st->need_parsing = AVSTREAM_PARSE_FULL;

816 }

817

818 for(i=0; i<s->nb_streams; i++){

819 AVStream *st = s->streams[i];

820 if(st->nb_index_entries)

821 break;

822 }

823 // DV-in-AVI cannot be non-interleaved, if set this must be

824 // a mis-detection.

825 if(avi->dv_demux)

826 avi->non_interleaved=0;

827 if(i==s->nb_streams && avi->non_interleaved) {

828 av_log(s, AV_LOG_WARNING, "non-interleaved AVI without index, switching to interleaved\n");

829 avi->non_interleaved=0;

830 }

831

832 if(avi->non_interleaved) {

833 av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");

834 clean_index(s);

835 }

836

837 ff_metadata_conv_ctx(s, NULL, avi_metadata_conv);

838 ff_metadata_conv_ctx(s, NULL, ff_riff_info_conv);

839

840 return 0;

841 }

842

843 static int read_gab2_sub(AVStream *st, AVPacket *pkt) {

844 if (pkt->data && !strcmp(pkt->data, "GAB2") && AV_RL16(pkt->data+5) == 2) {

845 uint8_t desc[256];

846 int score = AVPROBE_SCORE_EXTENSION, ret;

847 AVIStream *ast = st->priv_data;

848 AVInputFormat *sub_demuxer;

849 AVRational time_base;

850 AVIOContext *pb = avio_alloc_context( pkt->data + 7,

851 pkt->size - 7,

852 0, NULL, NULL, NULL, NULL);

853 AVProbeData pd;

854 unsigned int desc_len = avio_rl32(pb);

855

856 if (desc_len > pb->buf_end - pb->buf_ptr)

857 goto error;

858

859 ret = avio_get_str16le(pb, desc_len, desc, sizeof(desc));

860 avio_skip(pb, desc_len - ret);

861 if (*desc)

862 av_dict_set(&st->metadata, "title", desc, 0);

863

864 avio_rl16(pb); /* flags? */

865 avio_rl32(pb); /* data size */

866

867 pd = (AVProbeData) { .buf = pb->buf_ptr, .buf_size = pb->buf_end - pb->buf_ptr };

868 if (!(sub_demuxer = av_probe_input_format2(&pd, 1, &score)))

869 goto error;

870

871 if (!(ast->sub_ctx = avformat_alloc_context()))

872 goto error;

873

874 ast->sub_ctx->pb = pb;

875 if (!avformat_open_input(&ast->sub_ctx, "", sub_demuxer, NULL)) {

876 ff_read_packet(ast->sub_ctx, &ast->sub_pkt);

877 *st->codec = *ast->sub_ctx->streams[0]->codec;

878 ast->sub_ctx->streams[0]->codec->extradata = NULL;

879 time_base = ast->sub_ctx->streams[0]->time_base;

880 avpriv_set_pts_info(st, 64, time_base.num, time_base.den);

881 }

882 ast->sub_buffer = pkt->data;

883 memset(pkt, 0, sizeof(*pkt));

884 return 1;

885 error:

886 av_freep(&pb);

887 }

888 return 0;

889 }

890

891 static AVStream *get_subtitle_pkt(AVFormatContext *s, AVStream *next_st,

892 AVPacket *pkt)

893 {

894 AVIStream *ast, *next_ast = next_st->priv_data;

895 int64_t ts, next_ts, ts_min = INT64_MAX;

896 AVStream *st, *sub_st = NULL;

897 int i;

898

899 next_ts = av_rescale_q(next_ast->frame_offset, next_st->time_base,

900 AV_TIME_BASE_Q);

901

902 for (i=0; i<s->nb_streams; i++) {

903 st = s->streams[i];

904 ast = st->priv_data;

905 if (st->discard < AVDISCARD_ALL && ast && ast->sub_pkt.data) {

906 ts = av_rescale_q(ast->sub_pkt.dts, st->time_base, AV_TIME_BASE_Q);

907 if (ts <= next_ts && ts < ts_min) {

908 ts_min = ts;

909 sub_st = st;

910 }

911 }

912 }

913

914 if (sub_st) {

915 ast = sub_st->priv_data;

916 *pkt = ast->sub_pkt;

917 pkt->stream_index = sub_st->index;

918 if (ff_read_packet(ast->sub_ctx, &ast->sub_pkt) < 0)

919 ast->sub_pkt.data = NULL;

920 }

921 return sub_st;

922 }

923

924 static int get_stream_idx(int *d){

925 if( d[0] >= '0' && d[0] <= '9'

926 && d[1] >= '0' && d[1] <= '9'){

927 return (d[0] - '0') * 10 + (d[1] - '0');

928 }else{

929 return 100; //invalid stream ID

930 }

931 }

932

933 /**

934 *

935 * @param exit_early set to 1 to just gather packet position without making the changes needed to actually read & return the packet

936 */

937 static int avi_sync(AVFormatContext *s, int exit_early)

938 {

939 AVIContext *avi = s->priv_data;

940 AVIOContext *pb = s->pb;

941 int n;

942 unsigned int d[8];

943 unsigned int size;

944 int64_t i, sync;

945

946 start_sync:

947 memset(d, -1, sizeof(d));

948 for(i=sync=avio_tell(pb); !url_feof(pb); i++) {

949 int j;

950

951 for(j=0; j<7; j++)

952 d[j]= d[j+1];

953 d[7]= avio_r8(pb);

954

955 size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);

956

957 n= get_stream_idx(d+2);

958 av_dlog(s, "%X %X %X %X %X %X %X %X %"PRId64" %u %d\n",

959 d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], i, size, n);

960 if(i*(avi->io_fsize>0) + (uint64_t)size > avi->fsize || d[0] > 127)

961 continue;

962

963 //parse ix##

964 if( (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)

965 //parse JUNK

966 ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')

967 ||(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')){

968 avio_skip(pb, size);

969 goto start_sync;

970 }

971

972 //parse stray LIST

973 if(d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T'){

974 avio_skip(pb, 4);

975 goto start_sync;

976 }

977

978 n= get_stream_idx(d);

979

980 if(!((i-avi->last_pkt_pos)&1) && get_stream_idx(d+1) < s->nb_streams)

981 continue;

982

983 //detect ##ix chunk and skip

984 if(d[2] == 'i' && d[3] == 'x' && n < s->nb_streams){

985 avio_skip(pb, size);

986 goto start_sync;

987 }

988

989 //parse ##dc/##wb

990 if(n < s->nb_streams){

991 AVStream *st;

992 AVIStream *ast;

993 st = s->streams[n];

994 ast = st->priv_data;

995

996 if (!ast) {

997 av_log(s, AV_LOG_WARNING, "Skiping foreign stream %d packet\n", n);

998 continue;

999 }

1000

1001 if(s->nb_streams>=2){

1002 AVStream *st1 = s->streams[1];

1003 AVIStream *ast1= st1->priv_data;

1004 //workaround for broken small-file-bug402.avi

1005 if( d[2] == 'w' && d[3] == 'b'

1006 && n==0

1007 && st ->codec->codec_type == AVMEDIA_TYPE_VIDEO

1008 && st1->codec->codec_type == AVMEDIA_TYPE_AUDIO

1009 && ast->prefix == 'd'*256+'c'

1010 && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)

1011 ){

1012 n=1;

1013 st = st1;

1014 ast = ast1;

1015 av_log(s, AV_LOG_WARNING, "Invalid stream + prefix combination, assuming audio.\n");

1016 }

1017 }

1018

1019

1020 if( (st->discard >= AVDISCARD_DEFAULT && size==0)

1021 /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & AV_PKT_FLAG_KEY))*/ //FIXME needs a little reordering

1022 || st->discard >= AVDISCARD_ALL){

1023 if (!exit_early) {

1024 ast->frame_offset += get_duration(ast, size);

1025 avio_skip(pb, size);

1026 goto start_sync;

1027 }

1028 }

1029

1030 if (d[2] == 'p' && d[3] == 'c' && size<=4*256+4) {

1031 int k = avio_r8(pb);

1032 int last = (k + avio_r8(pb) - 1) & 0xFF;

1033

1034 avio_rl16(pb); //flags

1035

1036 for (; k <= last; k++)

1037 ast->pal[k] = 0xFFU<<24 | avio_rb32(pb)>>8;// b + (g << 8) + (r << 16);

1038 ast->has_pal= 1;

1039 goto start_sync;

1040 } else if( ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||

1041 d[2]*256+d[3] == ast->prefix /*||

1042 (d[2] == 'd' && d[3] == 'c') ||

1043 (d[2] == 'w' && d[3] == 'b')*/) {

1044

1045 if (exit_early)

1046 return 0;

1047 if(d[2]*256+d[3] == ast->prefix)

1048 ast->prefix_count++;

1049 else{

1050 ast->prefix= d[2]*256+d[3];

1051 ast->prefix_count= 0;

1052 }

1053

1054 avi->stream_index= n;

1055 ast->packet_size= size + 8;

1056 ast->remaining= size;

1057

1058 if(size || !ast->sample_size){

1059 uint64_t pos= avio_tell(pb) - 8;

1060 if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){

1061 av_add_index_entry(st, pos, ast->frame_offset, size, 0, AVINDEX_KEYFRAME);

1062 }

1063 }

1064 return 0;

1065 }

1066 }

1067 }

1068

1069 if(pb->error)

1070 return pb->error;

1071 return AVERROR_EOF;

1072 }

1073

1074 static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)

1075 {

1076 AVIContext *avi = s->priv_data;

1077 AVIOContext *pb = s->pb;

1078 int err;

1079 #if FF_API_DESTRUCT_PACKET

1080 void* dstr;

1081 #endif

1082

1083 if (CONFIG_DV_DEMUXER && avi->dv_demux) {

1084 int size = avpriv_dv_get_packet(avi->dv_demux, pkt);

1085 if (size >= 0)

1086 return size;

1087 }

1088

1089 if(avi->non_interleaved){

1090 int best_stream_index = 0;

1091 AVStream *best_st= NULL;

1092 AVIStream *best_ast;

1093 int64_t best_ts= INT64_MAX;

1094 int i;

1095

1096 for(i=0; i<s->nb_streams; i++){

1097 AVStream *st = s->streams[i];

1098 AVIStream *ast = st->priv_data;

1099 int64_t ts= ast->frame_offset;

1100 int64_t last_ts;

1101

1102 if(!st->nb_index_entries)

1103 continue;

1104

1105 last_ts = st->index_entries[st->nb_index_entries - 1].timestamp;

1106 if(!ast->remaining && ts > last_ts)

1107 continue;

1108

1109 ts = av_rescale_q(ts, st->time_base, (AVRational){FFMAX(1, ast->sample_size), AV_TIME_BASE});

1110

1111 av_dlog(s, "%"PRId64" %d/%d %"PRId64"\n", ts,

1112 st->time_base.num, st->time_base.den, ast->frame_offset);

1113 if(ts < best_ts){

1114 best_ts= ts;

1115 best_st= st;

1116 best_stream_index= i;

1117 }

1118 }

1119 if(!best_st)

1120 return AVERROR_EOF;

1121

1122 best_ast = best_st->priv_data;

1123 best_ts = best_ast->frame_offset;

1124 if(best_ast->remaining)

1125 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);

1126 else{

1127 i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);

1128 if(i>=0)

1129 best_ast->frame_offset= best_st->index_entries[i].timestamp;

1130 }

1131

1132 if(i>=0){

1133 int64_t pos= best_st->index_entries[i].pos;

1134 pos += best_ast->packet_size - best_ast->remaining;

1135 if(avio_seek(s->pb, pos + 8, SEEK_SET) < 0)

1136 return AVERROR_EOF;

1137

1138 av_assert0(best_ast->remaining <= best_ast->packet_size);

1139

1140 avi->stream_index= best_stream_index;

1141 if(!best_ast->remaining)

1142 best_ast->packet_size=

1143 best_ast->remaining= best_st->index_entries[i].size;

1144 }

1145 else

1146 return AVERROR_EOF;

1147 }

1148

1149 resync:

1150 if(avi->stream_index >= 0){

1151 AVStream *st= s->streams[ avi->stream_index ];

1152 AVIStream *ast= st->priv_data;

1153 int size, err;

1154

1155 if(get_subtitle_pkt(s, st, pkt))

1156 return 0;

1157

1158 if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM

1159 size= INT_MAX;

1160 else if(ast->sample_size < 32)

1161 // arbitrary multiplier to avoid tiny packets for raw PCM data

1162 size= 1024*ast->sample_size;

1163 else

1164 size= ast->sample_size;

1165

1166 if(size > ast->remaining)

1167 size= ast->remaining;

1168 avi->last_pkt_pos= avio_tell(pb);

1169 err= av_get_packet(pb, pkt, size);

1170 if(err<0)

1171 return err;

1172 size = err;

1173

1174 if(ast->has_pal && pkt->size<(unsigned)INT_MAX/2){

1175 uint8_t *pal;

1176 pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, AVPALETTE_SIZE);

1177 if(!pal){

1178 av_log(s, AV_LOG_ERROR, "Failed to allocate data for palette\n");

1179 }else{

1180 memcpy(pal, ast->pal, AVPALETTE_SIZE);

1181 ast->has_pal = 0;

1182 }

1183 }

1184

1185 if (CONFIG_DV_DEMUXER && avi->dv_demux) {

1186 AVBufferRef *avbuf = pkt->buf;

1187 #if FF_API_DESTRUCT_PACKET

1188 dstr = pkt->destruct;

1189 #endif

1190 size = avpriv_dv_produce_packet(avi->dv_demux, pkt,

1191 pkt->data, pkt->size, pkt->pos);

1192 #if FF_API_DESTRUCT_PACKET

1193 pkt->destruct = dstr;

1194 #endif

1195 pkt->buf = avbuf;

1196 pkt->flags |= AV_PKT_FLAG_KEY;

1197 if (size < 0)

1198 av_free_packet(pkt);

1199 } else if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE

1200 && !st->codec->codec_tag && read_gab2_sub(st, pkt)) {

1201 ast->frame_offset++;

1202 avi->stream_index = -1;

1203 ast->remaining = 0;

1204 goto resync;

1205 } else {

1206 /* XXX: How to handle B-frames in AVI? */

1207 pkt->dts = ast->frame_offset;

1208 // pkt->dts += ast->start;

1209 if(ast->sample_size)

1210 pkt->dts /= ast->sample_size;

1211 av_dlog(s, "dts:%"PRId64" offset:%"PRId64" %d/%d smpl_siz:%d base:%d st:%d size:%d\n",

1212 pkt->dts, ast->frame_offset, ast->scale, ast->rate,

1213 ast->sample_size, AV_TIME_BASE, avi->stream_index, size);

1214 pkt->stream_index = avi->stream_index;

1215

1216 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {

1217 AVIndexEntry *e;

1218 int index;

1219 av_assert0(st->index_entries);

1220

1221 index= av_index_search_timestamp(st, ast->frame_offset, 0);

1222 e= &st->index_entries[index];

1223

1224 if(index >= 0 && e->timestamp == ast->frame_offset){

1225 if (index == st->nb_index_entries-1){

1226 int key=1;

1227 int i;

1228 uint32_t state=-1;

1229 for(i=0; i<FFMIN(size,256); i++){

1230 if(st->codec->codec_id == AV_CODEC_ID_MPEG4){

1231 if(state == 0x1B6){

1232 key= !(pkt->data[i]&0xC0);

1233 break;

1234 }

1235 }else

1236 break;

1237 state= (state<<8) + pkt->data[i];

1238 }

1239 if(!key)

1240 e->flags &= ~AVINDEX_KEYFRAME;

1241 }

1242 if (e->flags & AVINDEX_KEYFRAME)

1243 pkt->flags |= AV_PKT_FLAG_KEY;

1244 }

1245 } else {

1246 pkt->flags |= AV_PKT_FLAG_KEY;

1247 }

1248 ast->frame_offset += get_duration(ast, pkt->size);

1249 }

1250 ast->remaining -= err;

1251 if(!ast->remaining){

1252 avi->stream_index= -1;

1253 ast->packet_size= 0;

1254 }

1255

1256 if(!avi->non_interleaved && pkt->pos >= 0 && ast->seek_pos > pkt->pos){

1257 av_free_packet(pkt);

1258 goto resync;

1259 }

1260 ast->seek_pos= 0;

1261

1262 if(!avi->non_interleaved && st->nb_index_entries>1 && avi->index_loaded>1){

1263 int64_t dts= av_rescale_q(pkt->dts, st->time_base, AV_TIME_BASE_Q);

1264

1265 if(avi->dts_max - dts > 2*AV_TIME_BASE){

1266 avi->non_interleaved= 1;

1267 av_log(s, AV_LOG_INFO, "Switching to NI mode, due to poor interleaving\n");

1268 }else if(avi->dts_max < dts)

1269 avi->dts_max = dts;

1270 }

1271

1272 return 0;

1273 }

1274

1275 if ((err = avi_sync(s, 0)) < 0)

1276 return err;

1277 goto resync;

1278 }

1279

1280 /* XXX: We make the implicit supposition that the positions are sorted

1281 for each stream. */

1282 static int avi_read_idx1(AVFormatContext *s, int size)

1283 {

1284 AVIContext *avi = s->priv_data;

1285 AVIOContext *pb = s->pb;

1286 int nb_index_entries, i;

1287 AVStream *st;

1288 AVIStream *ast;

1289 unsigned int index, tag, flags, pos, len, first_packet = 1;

1290 unsigned last_pos= -1;

1291 unsigned last_idx= -1;

1292 int64_t idx1_pos, first_packet_pos = 0, data_offset = 0;

1293 int anykey = 0;

1294

1295 nb_index_entries = size / 16;

1296 if (nb_index_entries <= 0)

1297 return AVERROR_INVALIDDATA;

1298

1299 idx1_pos = avio_tell(pb);

1300 avio_seek(pb, avi->movi_list+4, SEEK_SET);

1301 if (avi_sync(s, 1) == 0) {

1302 first_packet_pos = avio_tell(pb) - 8;

1303 }

1304 avi->stream_index = -1;

1305 avio_seek(pb, idx1_pos, SEEK_SET);

1306

1307 if (s->nb_streams == 1 && s->streams[0]->codec->codec_tag == AV_RL32("MMES")){

1308 first_packet_pos = 0;

1309 data_offset = avi->movi_list;

1310 }

1311

1312 /* Read the entries and sort them in each stream component. */

1313 for(i = 0; i < nb_index_entries; i++) {

1314 if(url_feof(pb))

1315 return -1;

1316

1317 tag = avio_rl32(pb);

1318 flags = avio_rl32(pb);

1319 pos = avio_rl32(pb);

1320 len = avio_rl32(pb);

1321 av_dlog(s, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",

1322 i, tag, flags, pos, len);

1323

1324 index = ((tag & 0xff) - '0') * 10;

1325 index += ((tag >> 8) & 0xff) - '0';

1326 if (index >= s->nb_streams)

1327 continue;

1328 st = s->streams[index];

1329 ast = st->priv_data;

1330

1331 if(first_packet && first_packet_pos && len) {

1332 data_offset = first_packet_pos - pos;

1333 first_packet = 0;

1334 }

1335 pos += data_offset;

1336

1337 av_dlog(s, "%d cum_len=%"PRId64"\n", len, ast->cum_len);

1338

1339 // even if we have only a single stream, we should

1340 // switch to non-interleaved to get correct timestamps

1341 if(last_pos == pos)

1342 avi->non_interleaved= 1;

1343 if(last_idx != pos && len) {

1344 av_add_index_entry(st, pos, ast->cum_len, len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);

1345 last_idx= pos;

1346 }

1347 ast->cum_len += get_duration(ast, len);

1348 last_pos= pos;

1349 anykey |= flags&AVIIF_INDEX;

1350 }

1351 if (!anykey) {

1352 for (index = 0; index < s->nb_streams; index++) {

1353 st = s->streams[index];

1354 if (st->nb_index_entries)

1355 st->index_entries[0].flags |= AVINDEX_KEYFRAME;

1356 }

1357 }

1358 return 0;

1359 }

1360

1361 static int guess_ni_flag(AVFormatContext *s){

1362 int i;

1363 int64_t last_start=0;

1364 int64_t first_end= INT64_MAX;

1365 int64_t oldpos= avio_tell(s->pb);

1366 int *idx;

1367 int64_t min_pos, pos;

1368

1369 for(i=0; i<s->nb_streams; i++){

1370 AVStream *st = s->streams[i];

1371 int n= st->nb_index_entries;

1372 unsigned int size;

1373

1374 if(n <= 0)

1375 continue;

1376

1377 if(n >= 2){

1378 int64_t pos= st->index_entries[0].pos;

1379 avio_seek(s->pb, pos + 4, SEEK_SET);

1380 size= avio_rl32(s->pb);

1381 if(pos + size > st->index_entries[1].pos)

1382 last_start= INT64_MAX;

1383 }

1384

1385 if(st->index_entries[0].pos > last_start)

1386 last_start= st->index_entries[0].pos;

1387 if(st->index_entries[n-1].pos < first_end)

1388 first_end= st->index_entries[n-1].pos;

1389 }

1390 avio_seek(s->pb, oldpos, SEEK_SET);

1391 if (last_start > first_end)

1392 return 1;

1393 idx= av_mallocz(sizeof(*idx) * s->nb_streams);

1394 for (min_pos=pos=0; min_pos!=INT64_MAX; pos= min_pos+1LU) {

1395 int64_t max_dts = INT64_MIN/2, min_dts= INT64_MAX/2;

1396 min_pos = INT64_MAX;

1397

1398 for (i=0; i<s->nb_streams; i++) {

1399 AVStream *st = s->streams[i];

1400 AVIStream *ast = st->priv_data;

1401 int n= st->nb_index_entries;

1402 while (idx[i]<n && st->index_entries[idx[i]].pos < pos)

1403 idx[i]++;

1404 if (idx[i] < n) {

1405 min_dts = FFMIN(min_dts, av_rescale_q(st->index_entries[idx[i]].timestamp/FFMAX(ast->sample_size, 1), st->time_base, AV_TIME_BASE_Q));

1406 min_pos = FFMIN(min_pos, st->index_entries[idx[i]].pos);

1407 }

1408 if (idx[i])

1409 max_dts = FFMAX(max_dts, av_rescale_q(st->index_entries[idx[i]-1].timestamp/FFMAX(ast->sample_size, 1), st->time_base, AV_TIME_BASE_Q));

1410 }

1411 if(max_dts - min_dts > 2*AV_TIME_BASE) {

1412 av_free(idx);

1413 return 1;

1414 }

1415 }

1416 av_free(idx);

1417 return 0;

1418 }

1419

1420 static int avi_load_index(AVFormatContext *s)

1421 {

1422 AVIContext *avi = s->priv_data;

1423 AVIOContext *pb = s->pb;

1424 uint32_t tag, size;

1425 int64_t pos= avio_tell(pb);

1426 int64_t next;

1427 int ret = -1;

1428

1429 if (avio_seek(pb, avi->movi_end, SEEK_SET) < 0)

1430 goto the_end; // maybe truncated file

1431 av_dlog(s, "movi_end=0x%"PRIx64"\n", avi->movi_end);

1432 for(;;) {

1433 tag = avio_rl32(pb);

1434 size = avio_rl32(pb);

1435 if (url_feof(pb))

1436 break;

1437 next = avio_tell(pb) + size + (size & 1);

1438

1439 av_dlog(s, "tag=%c%c%c%c size=0x%x\n",

1440 tag & 0xff,

1441 (tag >> 8) & 0xff,

1442 (tag >> 16) & 0xff,

1443 (tag >> 24) & 0xff,

1444 size);

1445

1446 if (tag == MKTAG('i', 'd', 'x', '1') &&

1447 avi_read_idx1(s, size) >= 0) {

1448 avi->index_loaded=2;

1449 ret = 0;

1450 }else if(tag == MKTAG('L', 'I', 'S', 'T')) {

1451 uint32_t tag1 = avio_rl32(pb);

1452

1453 if (tag1 == MKTAG('I', 'N', 'F', 'O'))

1454 ff_read_riff_info(s, size - 4);

1455 }else if(!ret)

1456 break;

1457

1458 if (avio_seek(pb, next, SEEK_SET) < 0)

1459 break; // something is wrong here

1460 }

1461 the_end:

1462 avio_seek(pb, pos, SEEK_SET);

1463 return ret;

1464 }

1465

1466 static void seek_subtitle(AVStream *st, AVStream *st2, int64_t timestamp)

1467 {

1468 AVIStream *ast2 = st2->priv_data;

1469 int64_t ts2 = av_rescale_q(timestamp, st->time_base, st2->time_base);

1470 av_free_packet(&ast2->sub_pkt);

1471 if (avformat_seek_file(ast2->sub_ctx, 0, INT64_MIN, ts2, ts2, 0) >= 0 ||

1472 avformat_seek_file(ast2->sub_ctx, 0, ts2, ts2, INT64_MAX, 0) >= 0)

1473 ff_read_packet(ast2->sub_ctx, &ast2->sub_pkt);

1474 }

1475

1476 static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)

1477 {

1478 AVIContext *avi = s->priv_data;

1479 AVStream *st;

1480 int i, index;

1481 int64_t pos, pos_min;

1482 AVIStream *ast;

1483

1484 if (!avi->index_loaded) {

1485 /* we only load the index on demand */

1486 avi_load_index(s);

1487 avi->index_loaded |= 1;

1488 }

1489 av_assert0(stream_index>= 0);

1490

1491 st = s->streams[stream_index];

1492 ast= st->priv_data;

1493 index= av_index_search_timestamp(st, timestamp * FFMAX(ast->sample_size, 1), flags);

1494 if (index<0) {

1495 if (st->nb_index_entries > 0)

1496 av_log(s, AV_LOG_DEBUG, "Failed to find timestamp %"PRId64 " in index %"PRId64 " .. %"PRId64 "\n",

1497 timestamp * FFMAX(ast->sample_size, 1),

1498 st->index_entries[0].timestamp,

1499 st->index_entries[st->nb_index_entries - 1].timestamp);

1500 return AVERROR_INVALIDDATA;

1501 }

1502

1503 /* find the position */

1504 pos = st->index_entries[index].pos;

1505 timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1);

1506

1507 av_dlog(s, "XX %"PRId64" %d %"PRId64"\n",

1508 timestamp, index, st->index_entries[index].timestamp);

1509

1510 if (CONFIG_DV_DEMUXER && avi->dv_demux) {

1511 /* One and only one real stream for DV in AVI, and it has video */

1512 /* offsets. Calling with other stream indexes should have failed */

1513 /* the av_index_search_timestamp call above. */

1514 av_assert0(stream_index == 0);

1515

1516 if(avio_seek(s->pb, pos, SEEK_SET) < 0)

1517 return -1;

1518

1519 /* Feed the DV video stream version of the timestamp to the */

1520 /* DV demux so it can synthesize correct timestamps. */

1521 ff_dv_offset_reset(avi->dv_demux, timestamp);

1522

1523 avi->stream_index= -1;

1524 return 0;

1525 }

1526

1527 pos_min= pos;

1528 for(i = 0; i < s->nb_streams; i++) {

1529 AVStream *st2 = s->streams[i];

1530 AVIStream *ast2 = st2->priv_data;

1531

1532 ast2->packet_size=

1533 ast2->remaining= 0;

1534

1535 if (ast2->sub_ctx) {

1536 seek_subtitle(st, st2, timestamp);

1537 continue;

1538 }

1539

1540 if (st2->nb_index_entries <= 0)

1541 continue;

1542

1543 // av_assert1(st2->codec->block_align);

1544 av_assert0((int64_t)st2->time_base.num*ast2->rate == (int64_t)st2->time_base.den*ast2->scale);

1545 index = av_index_search_timestamp(

1546 st2,

1547 av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),

1548 flags | AVSEEK_FLAG_BACKWARD | (st2->codec->codec_type != AVMEDIA_TYPE_VIDEO ? AVSEEK_FLAG_ANY : 0));

1549 if(index<0)

1550 index=0;

1551 ast2->seek_pos= st2->index_entries[index].pos;

1552 pos_min= FFMIN(pos_min,ast2->seek_pos);

1553 }

1554 for(i = 0; i < s->nb_streams; i++) {

1555 AVStream *st2 = s->streams[i];

1556 AVIStream *ast2 = st2->priv_data;

1557

1558 if (ast2->sub_ctx || st2->nb_index_entries <= 0)

1559 continue;

1560

1561 index = av_index_search_timestamp(

1562 st2,

1563 av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),

1564 flags | AVSEEK_FLAG_BACKWARD | (st2->codec->codec_type != AVMEDIA_TYPE_VIDEO ? AVSEEK_FLAG_ANY : 0));

1565 if(index<0)

1566 index=0;

1567 while(!avi->non_interleaved && index>0 && st2->index_entries[index-1].pos >= pos_min)

1568 index--;

1569 ast2->frame_offset = st2->index_entries[index].timestamp;

1570 }

1571

1572 /* do the seek */

1573 if (avio_seek(s->pb, pos_min, SEEK_SET) < 0) {

1574 av_log(s, AV_LOG_ERROR, "Seek failed\n");

1575 return -1;

1576 }

1577 avi->stream_index= -1;

1578 avi->dts_max= INT_MIN;

1579 return 0;

1580 }

1581

1582 static int avi_read_close(AVFormatContext *s)

1583 {

1584 int i;

1585 AVIContext *avi = s->priv_data;

1586

1587 for(i=0;i<s->nb_streams;i++) {

1588 AVStream *st = s->streams[i];

1589 AVIStream *ast = st->priv_data;

1590 if (ast) {

1591 if (ast->sub_ctx) {

1592 av_freep(&ast->sub_ctx->pb);

1593 avformat_close_input(&ast->sub_ctx);

1594 }

1595 av_free(ast->sub_buffer);

1596 av_free_packet(&ast->sub_pkt);

1597 }

1598 }

1599

1600 av_free(avi->dv_demux);

1601

1602 return 0;

1603 }

1604

1605 static int avi_probe(AVProbeData *p)

1606 {

1607 int i;

1608

1609 /* check file header */

1610 for(i=0; avi_headers[i][0]; i++)

1611 if(!memcmp(p->buf , avi_headers[i] , 4) &&

1612 !memcmp(p->buf+8, avi_headers[i]+4, 4))

1613 return AVPROBE_SCORE_MAX;

1614

1615 return 0;

1616 }

1617

1618 AVInputFormat ff_avi_demuxer = {

1619 .name = "avi",

1620 .long_name = NULL_IF_CONFIG_SMALL("AVI (Audio Video Interleaved)"),

1621 .priv_data_size = sizeof(AVIContext),

1622 .read_probe = avi_probe,

1623 .read_header = avi_read_header,

1624 .read_packet = avi_read_packet,

1625 .read_close = avi_read_close,

1626 .read_seek = avi_read_seek,

1627 .priv_class = &demuxer_class,

1628 };

Generated on Wed Jul 10 2013 23:48:11 for FFmpeg by doxygen 1.8.2