1 /*
2 * AVI demuxer
3 * Copyright (c) 2001 Fabrice Bellard
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 #include <inttypes.h>
23
24 #include "libavutil/avassert.h"
25 #include "libavutil/avstring.h"
26 #include "libavutil/opt.h"
27 #include "libavutil/dict.h"
28 #include "libavutil/internal.h"
29 #include "libavutil/intreadwrite.h"
30 #include "libavutil/mathematics.h"
31 #include "avformat.h"
32 #include "avi.h"
33 #include "dv.h"
34 #include "internal.h"
35 #include "isom.h"
36 #include "riff.h"
37 #include "libavcodec/bytestream.h"
38 #include "libavcodec/exif.h"
39 #include "libavcodec/internal.h"
40
41 typedef struct AVIStream {
42 int64_t frame_offset; /* current frame (video) or byte (audio) counter
43 * (used to compute the pts) */
44 int remaining;
45 int packet_size;
46
47 uint32_t handler;
48 uint32_t scale;
49 uint32_t rate;
50 int sample_size; /* size of one sample (or packet)
51 * (in the rate/scale sense) in bytes */
52
53 int64_t cum_len; /* temporary storage (used during seek) */
54 int prefix; /* normally 'd'<<8 + 'c' or 'w'<<8 + 'b' */
55 int prefix_count;
56 uint32_t pal[256];
57 int has_pal;
58 int dshow_block_align; /* block align variable used to emulate bugs in
59 * the MS dshow demuxer */
60
61 AVFormatContext *sub_ctx;
62 AVPacket *sub_pkt;
63 AVBufferRef *sub_buffer;
64
65 int64_t seek_pos;
66 } AVIStream;
67
68 typedef struct AVIContext {
69 const AVClass *class;
70 int64_t riff_end;
71 int64_t movi_end;
72 int64_t fsize;
73 int64_t io_fsize;
74 int64_t movi_list;
75 int64_t last_pkt_pos;
76 int index_loaded;
77 int is_odml;
78 int non_interleaved;
79 int stream_index;
80 DVDemuxContext *dv_demux;
81 int odml_depth;
82 int use_odml;
83 #define MAX_ODML_DEPTH 1000
84 int64_t dts_max;
85 } AVIContext;
86
87
88 static const AVOption options[] = {
89 { "use_odml", "use odml index", offsetof(AVIContext, use_odml), AV_OPT_TYPE_BOOL, {.i64 = 1}, -1, 1, AV_OPT_FLAG_DECODING_PARAM},
90 { NULL },
91 };
92
93 static const AVClass demuxer_class = {
94 .class_name = "avi",
95 .item_name = av_default_item_name,
96 .option = options,
97 .version = LIBAVUTIL_VERSION_INT,
98 .category = AV_CLASS_CATEGORY_DEMUXER,
99 };
100
101
102 static const char avi_headers[][8] = {
103 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', ' ' },
104 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 'X' },
105 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 0x19 },
106 { 'O', 'N', '2', ' ', 'O', 'N', '2', 'f' },
107 { 'R', 'I', 'F', 'F', 'A', 'M', 'V', ' ' },
108 { 0 }
109 };
110
111 static const AVMetadataConv avi_metadata_conv[] = {
112 { "strn", "title" },
113 { "isbj", "subject" },
114 { "inam", "title" },
115 { "iart", "artist" },
116 { "icop", "copyright" },
117 { "icmt", "comment" },
118 { "ignr", "genre" },
119 { "iprd", "product" },
120 { "isft", "software" },
121
122 { 0 },
123 };
124
125 static int avi_read_close(AVFormatContext *s);
126 static int avi_load_index(AVFormatContext *s);
127 static int guess_ni_flag(AVFormatContext *s);
128
129 #define print_tag(s, str, tag, size) \
130 av_log(s, AV_LOG_TRACE, "pos:%"PRIX64" %s: tag=%s size=0x%x\n", \
131 avio_tell(pb), str, av_fourcc2str(tag), size) \
132
get_duration(AVIStream * ast,int len)133 static inline int get_duration(AVIStream *ast, int len)
134 {
135 if (ast->sample_size)
136 return len;
137 else if (ast->dshow_block_align)
138 return (len + (int64_t)ast->dshow_block_align - 1) / ast->dshow_block_align;
139 else
140 return 1;
141 }
142
get_riff(AVFormatContext * s,AVIOContext * pb)143 static int get_riff(AVFormatContext *s, AVIOContext *pb)
144 {
145 AVIContext *avi = s->priv_data;
146 char header[8] = {0};
147 int i;
148
149 /* check RIFF header */
150 avio_read(pb, header, 4);
151 avi->riff_end = avio_rl32(pb); /* RIFF chunk size */
152 avi->riff_end += avio_tell(pb); /* RIFF chunk end */
153 avio_read(pb, header + 4, 4);
154
155 for (i = 0; avi_headers[i][0]; i++)
156 if (!memcmp(header, avi_headers[i], 8))
157 break;
158 if (!avi_headers[i][0])
159 return AVERROR_INVALIDDATA;
160
161 if (header[7] == 0x19)
162 av_log(s, AV_LOG_INFO,
163 "This file has been generated by a totally broken muxer.\n");
164
165 return 0;
166 }
167
read_odml_index(AVFormatContext * s,int64_t frame_num)168 static int read_odml_index(AVFormatContext *s, int64_t frame_num)
169 {
170 AVIContext *avi = s->priv_data;
171 AVIOContext *pb = s->pb;
172 int longs_per_entry = avio_rl16(pb);
173 int index_sub_type = avio_r8(pb);
174 int index_type = avio_r8(pb);
175 int entries_in_use = avio_rl32(pb);
176 int chunk_id = avio_rl32(pb);
177 int64_t base = avio_rl64(pb);
178 int stream_id = ((chunk_id & 0xFF) - '0') * 10 +
179 ((chunk_id >> 8 & 0xFF) - '0');
180 AVStream *st;
181 AVIStream *ast;
182 int i;
183 int64_t last_pos = -1;
184 int64_t filesize = avi->fsize;
185
186 av_log(s, AV_LOG_TRACE,
187 "longs_per_entry:%d index_type:%d entries_in_use:%d "
188 "chunk_id:%X base:%16"PRIX64" frame_num:%"PRId64"\n",
189 longs_per_entry,
190 index_type,
191 entries_in_use,
192 chunk_id,
193 base,
194 frame_num);
195
196 if (stream_id >= s->nb_streams || stream_id < 0)
197 return AVERROR_INVALIDDATA;
198 st = s->streams[stream_id];
199 ast = st->priv_data;
200
201 if (index_sub_type)
202 return AVERROR_INVALIDDATA;
203
204 avio_rl32(pb);
205
206 if (index_type && longs_per_entry != 2)
207 return AVERROR_INVALIDDATA;
208 if (index_type > 1)
209 return AVERROR_INVALIDDATA;
210
211 if (filesize > 0 && base >= filesize) {
212 av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
213 if (base >> 32 == (base & 0xFFFFFFFF) &&
214 (base & 0xFFFFFFFF) < filesize &&
215 filesize <= 0xFFFFFFFF)
216 base &= 0xFFFFFFFF;
217 else
218 return AVERROR_INVALIDDATA;
219 }
220
221 for (i = 0; i < entries_in_use; i++) {
222 if (index_type) {
223 int64_t pos = avio_rl32(pb) + base - 8;
224 int len = avio_rl32(pb);
225 int key = len >= 0;
226 len &= 0x7FFFFFFF;
227
228 av_log(s, AV_LOG_TRACE, "pos:%"PRId64", len:%X\n", pos, len);
229
230 if (avio_feof(pb))
231 return AVERROR_INVALIDDATA;
232
233 if (last_pos == pos || pos == base - 8)
234 avi->non_interleaved = 1;
235 if (last_pos != pos && len)
236 av_add_index_entry(st, pos, ast->cum_len, len, 0,
237 key ? AVINDEX_KEYFRAME : 0);
238
239 ast->cum_len += get_duration(ast, len);
240 last_pos = pos;
241 } else {
242 int64_t offset, pos;
243 int duration;
244 offset = avio_rl64(pb);
245 avio_rl32(pb); /* size */
246 duration = avio_rl32(pb);
247
248 if (avio_feof(pb) || offset > INT64_MAX - 8)
249 return AVERROR_INVALIDDATA;
250
251 pos = avio_tell(pb);
252
253 if (avi->odml_depth > MAX_ODML_DEPTH) {
254 av_log(s, AV_LOG_ERROR, "Too deeply nested ODML indexes\n");
255 return AVERROR_INVALIDDATA;
256 }
257
258 if (avio_seek(pb, offset + 8, SEEK_SET) < 0)
259 return -1;
260 avi->odml_depth++;
261 read_odml_index(s, frame_num);
262 avi->odml_depth--;
263 frame_num += duration;
264
265 if (avio_seek(pb, pos, SEEK_SET) < 0) {
266 av_log(s, AV_LOG_ERROR, "Failed to restore position after reading index\n");
267 return -1;
268 }
269
270 }
271 }
272 avi->index_loaded = 2;
273 return 0;
274 }
275
clean_index(AVFormatContext * s)276 static void clean_index(AVFormatContext *s)
277 {
278 int i;
279 int64_t j;
280
281 for (i = 0; i < s->nb_streams; i++) {
282 AVStream *st = s->streams[i];
283 AVIStream *ast = st->priv_data;
284 int n = st->nb_index_entries;
285 int max = ast->sample_size;
286 int64_t pos, size, ts;
287
288 if (n != 1 || ast->sample_size == 0)
289 continue;
290
291 while (max < 1024)
292 max += max;
293
294 pos = st->index_entries[0].pos;
295 size = st->index_entries[0].size;
296 ts = st->index_entries[0].timestamp;
297
298 for (j = 0; j < size; j += max)
299 av_add_index_entry(st, pos + j, ts + j, FFMIN(max, size - j), 0,
300 AVINDEX_KEYFRAME);
301 }
302 }
303
avi_read_tag(AVFormatContext * s,AVStream * st,uint32_t tag,uint32_t size)304 static int avi_read_tag(AVFormatContext *s, AVStream *st, uint32_t tag,
305 uint32_t size)
306 {
307 AVIOContext *pb = s->pb;
308 char key[5] = { 0 };
309 char *value;
310
311 size += (size & 1);
312
313 if (size == UINT_MAX)
314 return AVERROR(EINVAL);
315 value = av_malloc(size + 1);
316 if (!value)
317 return AVERROR(ENOMEM);
318 if (avio_read(pb, value, size) != size) {
319 av_freep(&value);
320 return AVERROR_INVALIDDATA;
321 }
322 value[size] = 0;
323
324 AV_WL32(key, tag);
325
326 return av_dict_set(st ? &st->metadata : &s->metadata, key, value,
327 AV_DICT_DONT_STRDUP_VAL);
328 }
329
330 static const char months[12][4] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
331 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
332
avi_metadata_creation_time(AVDictionary ** metadata,char * date)333 static void avi_metadata_creation_time(AVDictionary **metadata, char *date)
334 {
335 char month[4], time[9], buffer[64];
336 int i, day, year;
337 /* parse standard AVI date format (ie. "Mon Mar 10 15:04:43 2003") */
338 if (sscanf(date, "%*3s%*[ ]%3s%*[ ]%2d%*[ ]%8s%*[ ]%4d",
339 month, &day, time, &year) == 4) {
340 for (i = 0; i < 12; i++)
341 if (!av_strcasecmp(month, months[i])) {
342 snprintf(buffer, sizeof(buffer), "%.4d-%.2d-%.2d %s",
343 year, i + 1, day, time);
344 av_dict_set(metadata, "creation_time", buffer, 0);
345 }
346 } else if (date[4] == '/' && date[7] == '/') {
347 date[4] = date[7] = '-';
348 av_dict_set(metadata, "creation_time", date, 0);
349 }
350 }
351
avi_read_nikon(AVFormatContext * s,uint64_t end)352 static void avi_read_nikon(AVFormatContext *s, uint64_t end)
353 {
354 while (avio_tell(s->pb) < end && !avio_feof(s->pb)) {
355 uint32_t tag = avio_rl32(s->pb);
356 uint32_t size = avio_rl32(s->pb);
357 switch (tag) {
358 case MKTAG('n', 'c', 't', 'g'): /* Nikon Tags */
359 {
360 uint64_t tag_end = avio_tell(s->pb) + size;
361 while (avio_tell(s->pb) < tag_end && !avio_feof(s->pb)) {
362 uint16_t tag = avio_rl16(s->pb);
363 uint16_t size = avio_rl16(s->pb);
364 const char *name = NULL;
365 char buffer[64] = { 0 };
366 size = FFMIN(size, tag_end - avio_tell(s->pb));
367 size -= avio_read(s->pb, buffer,
368 FFMIN(size, sizeof(buffer) - 1));
369 switch (tag) {
370 case 0x03:
371 name = "maker";
372 break;
373 case 0x04:
374 name = "model";
375 break;
376 case 0x13:
377 name = "creation_time";
378 if (buffer[4] == ':' && buffer[7] == ':')
379 buffer[4] = buffer[7] = '-';
380 break;
381 }
382 if (name)
383 av_dict_set(&s->metadata, name, buffer, 0);
384 avio_skip(s->pb, size);
385 }
386 break;
387 }
388 default:
389 avio_skip(s->pb, size);
390 break;
391 }
392 }
393 }
394
avi_extract_stream_metadata(AVFormatContext * s,AVStream * st)395 static int avi_extract_stream_metadata(AVFormatContext *s, AVStream *st)
396 {
397 GetByteContext gb;
398 uint8_t *data = st->codecpar->extradata;
399 int data_size = st->codecpar->extradata_size;
400 int tag, offset;
401
402 if (!data || data_size < 8) {
403 return AVERROR_INVALIDDATA;
404 }
405
406 bytestream2_init(&gb, data, data_size);
407
408 tag = bytestream2_get_le32(&gb);
409
410 switch (tag) {
411 case MKTAG('A', 'V', 'I', 'F'):
412 // skip 4 byte padding
413 bytestream2_skip(&gb, 4);
414 offset = bytestream2_tell(&gb);
415
416 // decode EXIF tags from IFD, AVI is always little-endian
417 return avpriv_exif_decode_ifd(s, data + offset, data_size - offset,
418 1, 0, &st->metadata);
419 break;
420 case MKTAG('C', 'A', 'S', 'I'):
421 avpriv_request_sample(s, "RIFF stream data tag type CASI (%u)", tag);
422 break;
423 case MKTAG('Z', 'o', 'r', 'a'):
424 avpriv_request_sample(s, "RIFF stream data tag type Zora (%u)", tag);
425 break;
426 default:
427 break;
428 }
429
430 return 0;
431 }
432
calculate_bitrate(AVFormatContext * s)433 static int calculate_bitrate(AVFormatContext *s)
434 {
435 AVIContext *avi = s->priv_data;
436 int i, j;
437 int64_t lensum = 0;
438 int64_t maxpos = 0;
439
440 for (i = 0; i<s->nb_streams; i++) {
441 int64_t len = 0;
442 AVStream *st = s->streams[i];
443
444 if (!st->nb_index_entries)
445 continue;
446
447 for (j = 0; j < st->nb_index_entries; j++)
448 len += st->index_entries[j].size;
449 maxpos = FFMAX(maxpos, st->index_entries[j-1].pos);
450 lensum += len;
451 }
452 if (maxpos < av_rescale(avi->io_fsize, 9, 10)) // index does not cover the whole file
453 return 0;
454 if (lensum*9/10 > maxpos || lensum < maxpos*9/10) // frame sum and filesize mismatch
455 return 0;
456
457 for (i = 0; i<s->nb_streams; i++) {
458 int64_t len = 0;
459 AVStream *st = s->streams[i];
460 int64_t duration;
461 int64_t bitrate;
462
463 for (j = 0; j < st->nb_index_entries; j++)
464 len += st->index_entries[j].size;
465
466 if (st->nb_index_entries < 2 || st->codecpar->bit_rate > 0)
467 continue;
468 duration = st->index_entries[j-1].timestamp - st->index_entries[0].timestamp;
469 bitrate = av_rescale(8*len, st->time_base.den, duration * st->time_base.num);
470 if (bitrate > 0) {
471 st->codecpar->bit_rate = bitrate;
472 }
473 }
474 return 1;
475 }
476
477 #define RETURN_ERROR(code) do { ret = (code); goto fail; } while (0)
avi_read_header(AVFormatContext * s)478 static int avi_read_header(AVFormatContext *s)
479 {
480 AVIContext *avi = s->priv_data;
481 AVIOContext *pb = s->pb;
482 unsigned int tag, tag1, handler;
483 int codec_type, stream_index, frame_period;
484 unsigned int size;
485 int i;
486 AVStream *st;
487 AVIStream *ast = NULL;
488 int avih_width = 0, avih_height = 0;
489 int amv_file_format = 0;
490 uint64_t list_end = 0;
491 int64_t pos;
492 int ret;
493 AVDictionaryEntry *dict_entry;
494
495 avi->stream_index = -1;
496
497 ret = get_riff(s, pb);
498 if (ret < 0)
499 return ret;
500
501 av_log(avi, AV_LOG_DEBUG, "use odml:%d\n", avi->use_odml);
502
503 avi->io_fsize = avi->fsize = avio_size(pb);
504 if (avi->fsize <= 0 || avi->fsize < avi->riff_end)
505 avi->fsize = avi->riff_end == 8 ? INT64_MAX : avi->riff_end;
506
507 /* first list tag */
508 stream_index = -1;
509 codec_type = -1;
510 frame_period = 0;
511 for (;;) {
512 if (avio_feof(pb))
513 RETURN_ERROR(AVERROR_INVALIDDATA);
514 tag = avio_rl32(pb);
515 size = avio_rl32(pb);
516
517 print_tag(s, "tag", tag, size);
518
519 switch (tag) {
520 case MKTAG('L', 'I', 'S', 'T'):
521 list_end = avio_tell(pb) + size;
522 /* Ignored, except at start of video packets. */
523 tag1 = avio_rl32(pb);
524
525 print_tag(s, "list", tag1, 0);
526
527 if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
528 avi->movi_list = avio_tell(pb) - 4;
529 if (size)
530 avi->movi_end = avi->movi_list + size + (size & 1);
531 else
532 avi->movi_end = avi->fsize;
533 av_log(s, AV_LOG_TRACE, "movi end=%"PRIx64"\n", avi->movi_end);
534 goto end_of_header;
535 } else if (tag1 == MKTAG('I', 'N', 'F', 'O'))
536 ff_read_riff_info(s, size - 4);
537 else if (tag1 == MKTAG('n', 'c', 'd', 't'))
538 avi_read_nikon(s, list_end);
539
540 break;
541 case MKTAG('I', 'D', 'I', 'T'):
542 {
543 unsigned char date[64] = { 0 };
544 size += (size & 1);
545 size -= avio_read(pb, date, FFMIN(size, sizeof(date) - 1));
546 avio_skip(pb, size);
547 avi_metadata_creation_time(&s->metadata, date);
548 break;
549 }
550 case MKTAG('d', 'm', 'l', 'h'):
551 avi->is_odml = 1;
552 avio_skip(pb, size + (size & 1));
553 break;
554 case MKTAG('a', 'm', 'v', 'h'):
555 amv_file_format = 1;
556 case MKTAG('a', 'v', 'i', 'h'):
557 /* AVI header */
558 /* using frame_period is bad idea */
559 frame_period = avio_rl32(pb);
560 avio_rl32(pb); /* max. bytes per second */
561 avio_rl32(pb);
562 avi->non_interleaved |= avio_rl32(pb) & AVIF_MUSTUSEINDEX;
563
564 avio_skip(pb, 2 * 4);
565 avio_rl32(pb);
566 avio_rl32(pb);
567 avih_width = avio_rl32(pb);
568 avih_height = avio_rl32(pb);
569
570 avio_skip(pb, size - 10 * 4);
571 break;
572 case MKTAG('s', 't', 'r', 'h'):
573 /* stream header */
574
575 tag1 = avio_rl32(pb);
576 handler = avio_rl32(pb); /* codec tag */
577
578 if (tag1 == MKTAG('p', 'a', 'd', 's')) {
579 avio_skip(pb, size - 8);
580 break;
581 } else {
582 stream_index++;
583 st = avformat_new_stream(s, NULL);
584 if (!st)
585 RETURN_ERROR(AVERROR(ENOMEM));
586
587 st->id = stream_index;
588 ast = av_mallocz(sizeof(AVIStream));
589 if (!ast)
590 RETURN_ERROR(AVERROR(ENOMEM));
591 st->priv_data = ast;
592 }
593 if (amv_file_format)
594 tag1 = stream_index ? MKTAG('a', 'u', 'd', 's')
595 : MKTAG('v', 'i', 'd', 's');
596
597 print_tag(s, "strh", tag1, -1);
598
599 if (tag1 == MKTAG('i', 'a', 'v', 's') ||
600 tag1 == MKTAG('i', 'v', 'a', 's')) {
601 int64_t dv_dur;
602
603 /* After some consideration -- I don't think we
604 * have to support anything but DV in type1 AVIs. */
605 if (s->nb_streams != 1)
606 RETURN_ERROR(AVERROR_INVALIDDATA);
607
608 if (handler != MKTAG('d', 'v', 's', 'd') &&
609 handler != MKTAG('d', 'v', 'h', 'd') &&
610 handler != MKTAG('d', 'v', 's', 'l'))
611 return AVERROR_INVALIDDATA;
612
613 if (!CONFIG_DV_DEMUXER)
614 return AVERROR_DEMUXER_NOT_FOUND;
615
616 ast = s->streams[0]->priv_data;
617 st->priv_data = NULL;
618 ff_free_stream(s, st);
619
620 avi->dv_demux = avpriv_dv_init_demux(s);
621 if (!avi->dv_demux) {
622 av_free(ast);
623 return AVERROR(ENOMEM);
624 }
625
626 s->streams[0]->priv_data = ast;
627 avio_skip(pb, 3 * 4);
628 ast->scale = avio_rl32(pb);
629 ast->rate = avio_rl32(pb);
630 avio_skip(pb, 4); /* start time */
631
632 dv_dur = avio_rl32(pb);
633 if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
634 dv_dur *= AV_TIME_BASE;
635 s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
636 }
637 /* else, leave duration alone; timing estimation in utils.c
638 * will make a guess based on bitrate. */
639
640 stream_index = s->nb_streams - 1;
641 avio_skip(pb, size - 9 * 4);
642 break;
643 }
644
645 av_assert0(stream_index < s->nb_streams);
646 ast->handler = handler;
647
648 avio_rl32(pb); /* flags */
649 avio_rl16(pb); /* priority */
650 avio_rl16(pb); /* language */
651 avio_rl32(pb); /* initial frame */
652 ast->scale = avio_rl32(pb);
653 ast->rate = avio_rl32(pb);
654 if (!(ast->scale && ast->rate)) {
655 av_log(s, AV_LOG_WARNING,
656 "scale/rate is %"PRIu32"/%"PRIu32" which is invalid. "
657 "(This file has been generated by broken software.)\n",
658 ast->scale,
659 ast->rate);
660 if (frame_period) {
661 ast->rate = 1000000;
662 ast->scale = frame_period;
663 } else {
664 ast->rate = 25;
665 ast->scale = 1;
666 }
667 }
668 avpriv_set_pts_info(st, 64, ast->scale, ast->rate);
669
670 ast->cum_len = avio_rl32(pb); /* start */
671 st->nb_frames = avio_rl32(pb);
672
673 st->start_time = 0;
674 avio_rl32(pb); /* buffer size */
675 avio_rl32(pb); /* quality */
676 if (ast->cum_len > 3600LL * ast->rate / ast->scale) {
677 av_log(s, AV_LOG_ERROR, "crazy start time, iam scared, giving up\n");
678 ast->cum_len = 0;
679 }
680 ast->sample_size = avio_rl32(pb);
681 ast->cum_len *= FFMAX(1, ast->sample_size);
682 av_log(s, AV_LOG_TRACE, "%"PRIu32" %"PRIu32" %d\n",
683 ast->rate, ast->scale, ast->sample_size);
684
685 switch (tag1) {
686 case MKTAG('v', 'i', 'd', 's'):
687 codec_type = AVMEDIA_TYPE_VIDEO;
688
689 ast->sample_size = 0;
690 st->avg_frame_rate = av_inv_q(st->time_base);
691 break;
692 case MKTAG('a', 'u', 'd', 's'):
693 codec_type = AVMEDIA_TYPE_AUDIO;
694 break;
695 case MKTAG('t', 'x', 't', 's'):
696 codec_type = AVMEDIA_TYPE_SUBTITLE;
697 break;
698 case MKTAG('d', 'a', 't', 's'):
699 codec_type = AVMEDIA_TYPE_DATA;
700 break;
701 default:
702 av_log(s, AV_LOG_INFO, "unknown stream type %X\n", tag1);
703 }
704
705 if (ast->sample_size < 0) {
706 if (s->error_recognition & AV_EF_EXPLODE) {
707 av_log(s, AV_LOG_ERROR,
708 "Invalid sample_size %d at stream %d\n",
709 ast->sample_size,
710 stream_index);
711 RETURN_ERROR(AVERROR_INVALIDDATA);
712 }
713 av_log(s, AV_LOG_WARNING,
714 "Invalid sample_size %d at stream %d "
715 "setting it to 0\n",
716 ast->sample_size,
717 stream_index);
718 ast->sample_size = 0;
719 }
720
721 if (ast->sample_size == 0) {
722 st->duration = st->nb_frames;
723 if (st->duration > 0 && avi->io_fsize > 0 && avi->riff_end > avi->io_fsize) {
724 av_log(s, AV_LOG_DEBUG, "File is truncated adjusting duration\n");
725 st->duration = av_rescale(st->duration, avi->io_fsize, avi->riff_end);
726 }
727 }
728 ast->frame_offset = ast->cum_len;
729 avio_skip(pb, size - 12 * 4);
730 break;
731 case MKTAG('s', 't', 'r', 'f'):
732 /* stream header */
733 if (!size && (codec_type == AVMEDIA_TYPE_AUDIO ||
734 codec_type == AVMEDIA_TYPE_VIDEO))
735 break;
736 if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
737 avio_skip(pb, size);
738 } else {
739 uint64_t cur_pos = avio_tell(pb);
740 unsigned esize;
741 if (cur_pos < list_end)
742 size = FFMIN(size, list_end - cur_pos);
743 st = s->streams[stream_index];
744 if (st->codecpar->codec_type != AVMEDIA_TYPE_UNKNOWN) {
745 avio_skip(pb, size);
746 break;
747 }
748 switch (codec_type) {
749 case AVMEDIA_TYPE_VIDEO:
750 if (amv_file_format) {
751 st->codecpar->width = avih_width;
752 st->codecpar->height = avih_height;
753 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
754 st->codecpar->codec_id = AV_CODEC_ID_AMV;
755 avio_skip(pb, size);
756 break;
757 }
758 tag1 = ff_get_bmp_header(pb, st, &esize);
759
760 if (tag1 == MKTAG('D', 'X', 'S', 'B') ||
761 tag1 == MKTAG('D', 'X', 'S', 'A')) {
762 st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
763 st->codecpar->codec_tag = tag1;
764 st->codecpar->codec_id = AV_CODEC_ID_XSUB;
765 break;
766 }
767
768 if (size > 10 * 4 && size < (1 << 30) && size < avi->fsize) {
769 if (esize == size-1 && (esize&1)) {
770 st->codecpar->extradata_size = esize - 10 * 4;
771 } else
772 st->codecpar->extradata_size = size - 10 * 4;
773 if (st->codecpar->extradata) {
774 av_log(s, AV_LOG_WARNING, "New extradata in strf chunk, freeing previous one.\n");
775 }
776 ret = ff_get_extradata(s, st->codecpar, pb,
777 st->codecpar->extradata_size);
778 if (ret < 0)
779 return ret;
780 }
781
782 // FIXME: check if the encoder really did this correctly
783 if (st->codecpar->extradata_size & 1)
784 avio_r8(pb);
785
786 /* Extract palette from extradata if bpp <= 8.
787 * This code assumes that extradata contains only palette.
788 * This is true for all paletted codecs implemented in
789 * FFmpeg. */
790 if (st->codecpar->extradata_size &&
791 (st->codecpar->bits_per_coded_sample <= 8)) {
792 int pal_size = (1 << st->codecpar->bits_per_coded_sample) << 2;
793 const uint8_t *pal_src;
794
795 pal_size = FFMIN(pal_size, st->codecpar->extradata_size);
796 pal_src = st->codecpar->extradata +
797 st->codecpar->extradata_size - pal_size;
798 /* Exclude the "BottomUp" field from the palette */
799 if (pal_src - st->codecpar->extradata >= 9 &&
800 !memcmp(st->codecpar->extradata + st->codecpar->extradata_size - 9, "BottomUp", 9))
801 pal_src -= 9;
802 for (i = 0; i < pal_size / 4; i++)
803 ast->pal[i] = 0xFFU<<24 | AV_RL32(pal_src + 4 * i);
804 ast->has_pal = 1;
805 }
806
807 print_tag(s, "video", tag1, 0);
808
809 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
810 st->codecpar->codec_tag = tag1;
811 st->codecpar->codec_id = ff_codec_get_id(ff_codec_bmp_tags,
812 tag1);
813 /* If codec is not found yet, try with the mov tags. */
814 if (!st->codecpar->codec_id) {
815 st->codecpar->codec_id =
816 ff_codec_get_id(ff_codec_movvideo_tags, tag1);
817 if (st->codecpar->codec_id)
818 av_log(s, AV_LOG_WARNING,
819 "mov tag found in avi (fourcc %s)\n",
820 av_fourcc2str(tag1));
821 }
822 if (!st->codecpar->codec_id)
823 st->codecpar->codec_id = ff_codec_get_id(ff_codec_bmp_tags_unofficial, tag1);
824
825 /* This is needed to get the pict type which is necessary
826 * for generating correct pts. */
827 st->need_parsing = AVSTREAM_PARSE_HEADERS;
828
829 if (st->codecpar->codec_id == AV_CODEC_ID_MPEG4 &&
830 ast->handler == MKTAG('X', 'V', 'I', 'D'))
831 st->codecpar->codec_tag = MKTAG('X', 'V', 'I', 'D');
832
833 if (st->codecpar->codec_tag == MKTAG('V', 'S', 'S', 'H'))
834 st->need_parsing = AVSTREAM_PARSE_FULL;
835 if (st->codecpar->codec_id == AV_CODEC_ID_RV40)
836 st->need_parsing = AVSTREAM_PARSE_NONE;
837 if (st->codecpar->codec_id == AV_CODEC_ID_HEVC &&
838 st->codecpar->codec_tag == MKTAG('H', '2', '6', '5'))
839 st->need_parsing = AVSTREAM_PARSE_FULL;
840
841 if (st->codecpar->codec_id == AV_CODEC_ID_AVRN &&
842 st->codecpar->codec_tag == MKTAG('A', 'V', 'R', 'n') &&
843 (st->codecpar->extradata_size < 31 ||
844 memcmp(&st->codecpar->extradata[28], "1:1", 3)))
845 st->codecpar->codec_id = AV_CODEC_ID_MJPEG;
846
847 if (st->codecpar->codec_tag == 0 && st->codecpar->height > 0 &&
848 st->codecpar->extradata_size < 1U << 30) {
849 st->codecpar->extradata_size += 9;
850 if ((ret = av_reallocp(&st->codecpar->extradata,
851 st->codecpar->extradata_size +
852 AV_INPUT_BUFFER_PADDING_SIZE)) < 0) {
853 st->codecpar->extradata_size = 0;
854 return ret;
855 } else
856 memcpy(st->codecpar->extradata + st->codecpar->extradata_size - 9,
857 "BottomUp", 9);
858 }
859 st->codecpar->height = FFABS(st->codecpar->height);
860
861 // avio_skip(pb, size - 5 * 4);
862 break;
863 case AVMEDIA_TYPE_AUDIO:
864 ret = ff_get_wav_header(s, pb, st->codecpar, size, 0);
865 if (ret < 0)
866 return ret;
867 ast->dshow_block_align = st->codecpar->block_align;
868 if (ast->sample_size && st->codecpar->block_align &&
869 ast->sample_size != st->codecpar->block_align) {
870 av_log(s,
871 AV_LOG_WARNING,
872 "sample size (%d) != block align (%d)\n",
873 ast->sample_size,
874 st->codecpar->block_align);
875 ast->sample_size = st->codecpar->block_align;
876 }
877 /* 2-aligned
878 * (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
879 if (size & 1)
880 avio_skip(pb, 1);
881 /* Force parsing as several audio frames can be in
882 * one packet and timestamps refer to packet start. */
883 st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
884 /* ADTS header is in extradata, AAC without header must be
885 * stored as exact frames. Parser not needed and it will
886 * fail. */
887 if (st->codecpar->codec_id == AV_CODEC_ID_AAC &&
888 st->codecpar->extradata_size)
889 st->need_parsing = AVSTREAM_PARSE_NONE;
890 // The flac parser does not work with AVSTREAM_PARSE_TIMESTAMPS
891 if (st->codecpar->codec_id == AV_CODEC_ID_FLAC)
892 st->need_parsing = AVSTREAM_PARSE_NONE;
893 /* AVI files with Xan DPCM audio (wrongly) declare PCM
894 * audio in the header but have Axan as stream_code_tag. */
895 if (ast->handler == AV_RL32("Axan")) {
896 st->codecpar->codec_id = AV_CODEC_ID_XAN_DPCM;
897 st->codecpar->codec_tag = 0;
898 ast->dshow_block_align = 0;
899 }
900 if (amv_file_format) {
901 st->codecpar->codec_id = AV_CODEC_ID_ADPCM_IMA_AMV;
902 ast->dshow_block_align = 0;
903 }
904 if ((st->codecpar->codec_id == AV_CODEC_ID_AAC ||
905 st->codecpar->codec_id == AV_CODEC_ID_FLAC ||
906 st->codecpar->codec_id == AV_CODEC_ID_MP2 ) && ast->dshow_block_align <= 4 && ast->dshow_block_align) {
907 av_log(s, AV_LOG_DEBUG, "overriding invalid dshow_block_align of %d\n", ast->dshow_block_align);
908 ast->dshow_block_align = 0;
909 }
910 if (st->codecpar->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align == 1024 && ast->sample_size == 1024 ||
911 st->codecpar->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align == 4096 && ast->sample_size == 4096 ||
912 st->codecpar->codec_id == AV_CODEC_ID_MP3 && ast->dshow_block_align == 1152 && ast->sample_size == 1152) {
913 av_log(s, AV_LOG_DEBUG, "overriding sample_size\n");
914 ast->sample_size = 0;
915 }
916 break;
917 case AVMEDIA_TYPE_SUBTITLE:
918 st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
919 st->internal->request_probe= 1;
920 avio_skip(pb, size);
921 break;
922 default:
923 st->codecpar->codec_type = AVMEDIA_TYPE_DATA;
924 st->codecpar->codec_id = AV_CODEC_ID_NONE;
925 st->codecpar->codec_tag = 0;
926 avio_skip(pb, size);
927 break;
928 }
929 }
930 break;
931 case MKTAG('s', 't', 'r', 'd'):
932 if (stream_index >= (unsigned)s->nb_streams
933 || s->streams[stream_index]->codecpar->extradata_size
934 || s->streams[stream_index]->codecpar->codec_tag == MKTAG('H','2','6','4')) {
935 avio_skip(pb, size);
936 } else {
937 uint64_t cur_pos = avio_tell(pb);
938 if (cur_pos < list_end)
939 size = FFMIN(size, list_end - cur_pos);
940 st = s->streams[stream_index];
941
942 if (size<(1<<30)) {
943 if (st->codecpar->extradata) {
944 av_log(s, AV_LOG_WARNING, "New extradata in strd chunk, freeing previous one.\n");
945 }
946 if ((ret = ff_get_extradata(s, st->codecpar, pb, size)) < 0)
947 goto fail;
948 }
949
950 if (st->codecpar->extradata_size & 1) //FIXME check if the encoder really did this correctly
951 avio_r8(pb);
952
953 ret = avi_extract_stream_metadata(s, st);
954 if (ret < 0) {
955 av_log(s, AV_LOG_WARNING, "could not decoding EXIF data in stream header.\n");
956 }
957 }
958 break;
959 case MKTAG('i', 'n', 'd', 'x'):
960 pos = avio_tell(pb);
961 if ((pb->seekable & AVIO_SEEKABLE_NORMAL) && !(s->flags & AVFMT_FLAG_IGNIDX) &&
962 avi->use_odml &&
963 read_odml_index(s, 0) < 0 &&
964 (s->error_recognition & AV_EF_EXPLODE))
965 RETURN_ERROR(AVERROR_INVALIDDATA);
966 avio_seek(pb, pos + size, SEEK_SET);
967 break;
968 case MKTAG('v', 'p', 'r', 'p'):
969 if (stream_index < (unsigned)s->nb_streams && size > 9 * 4) {
970 AVRational active, active_aspect;
971
972 st = s->streams[stream_index];
973 avio_rl32(pb);
974 avio_rl32(pb);
975 avio_rl32(pb);
976 avio_rl32(pb);
977 avio_rl32(pb);
978
979 active_aspect.den = avio_rl16(pb);
980 active_aspect.num = avio_rl16(pb);
981 active.num = avio_rl32(pb);
982 active.den = avio_rl32(pb);
983 avio_rl32(pb); // nbFieldsPerFrame
984
985 if (active_aspect.num && active_aspect.den &&
986 active.num && active.den) {
987 st->sample_aspect_ratio = av_div_q(active_aspect, active);
988 av_log(s, AV_LOG_TRACE, "vprp %d/%d %d/%d\n",
989 active_aspect.num, active_aspect.den,
990 active.num, active.den);
991 }
992 size -= 9 * 4;
993 }
994 avio_skip(pb, size);
995 break;
996 case MKTAG('s', 't', 'r', 'n'):
997 case MKTAG('i', 's', 'b', 'j'):
998 case MKTAG('i', 'n', 'a', 'm'):
999 case MKTAG('i', 'a', 'r', 't'):
1000 case MKTAG('i', 'c', 'o', 'p'):
1001 case MKTAG('i', 'c', 'm', 't'):
1002 case MKTAG('i', 'g', 'n', 'r'):
1003 case MKTAG('i', 'p', 'o', 'd'):
1004 case MKTAG('i', 's', 'o', 'f'):
1005 if (s->nb_streams) {
1006 ret = avi_read_tag(s, s->streams[s->nb_streams - 1], tag, size);
1007 if (ret < 0)
1008 goto fail;
1009 break;
1010 }
1011 default:
1012 if (size > 1000000) {
1013 av_log(s, AV_LOG_ERROR,
1014 "Something went wrong during header parsing, "
1015 "tag %s has size %u, "
1016 "I will ignore it and try to continue anyway.\n",
1017 av_fourcc2str(tag), size);
1018 if (s->error_recognition & AV_EF_EXPLODE)
1019 RETURN_ERROR(AVERROR_INVALIDDATA);
1020 avi->movi_list = avio_tell(pb) - 4;
1021 avi->movi_end = avi->fsize;
1022 goto end_of_header;
1023 }
1024 /* Do not fail for very large idx1 tags */
1025 case MKTAG('i', 'd', 'x', '1'):
1026 /* skip tag */
1027 size += (size & 1);
1028 avio_skip(pb, size);
1029 break;
1030 }
1031 }
1032
1033 end_of_header:
1034 /* check stream number */
1035 if (stream_index != s->nb_streams - 1) {
1036 RETURN_ERROR(AVERROR_INVALIDDATA);
1037 }
1038
1039 if (!avi->index_loaded && (pb->seekable & AVIO_SEEKABLE_NORMAL))
1040 avi_load_index(s);
1041 calculate_bitrate(s);
1042 avi->index_loaded |= 1;
1043
1044 if ((ret = guess_ni_flag(s)) < 0)
1045 goto fail;
1046
1047 avi->non_interleaved |= ret | (s->flags & AVFMT_FLAG_SORT_DTS);
1048
1049 dict_entry = av_dict_get(s->metadata, "ISFT", NULL, 0);
1050 if (dict_entry && !strcmp(dict_entry->value, "PotEncoder"))
1051 for (i = 0; i < s->nb_streams; i++) {
1052 AVStream *st = s->streams[i];
1053 if ( st->codecpar->codec_id == AV_CODEC_ID_MPEG1VIDEO
1054 || st->codecpar->codec_id == AV_CODEC_ID_MPEG2VIDEO)
1055 st->need_parsing = AVSTREAM_PARSE_FULL;
1056 }
1057
1058 for (i = 0; i < s->nb_streams; i++) {
1059 AVStream *st = s->streams[i];
1060 if (st->nb_index_entries)
1061 break;
1062 }
1063 // DV-in-AVI cannot be non-interleaved, if set this must be
1064 // a mis-detection.
1065 if (avi->dv_demux)
1066 avi->non_interleaved = 0;
1067 if (i == s->nb_streams && avi->non_interleaved) {
1068 av_log(s, AV_LOG_WARNING,
1069 "Non-interleaved AVI without index, switching to interleaved\n");
1070 avi->non_interleaved = 0;
1071 }
1072
1073 if (avi->non_interleaved) {
1074 av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
1075 clean_index(s);
1076 }
1077
1078 ff_metadata_conv_ctx(s, NULL, avi_metadata_conv);
1079 ff_metadata_conv_ctx(s, NULL, ff_riff_info_conv);
1080
1081 return 0;
1082 fail:
1083 avi_read_close(s);
1084 return ret;
1085 }
1086
read_gab2_sub(AVFormatContext * s,AVStream * st,AVPacket * pkt)1087 static int read_gab2_sub(AVFormatContext *s, AVStream *st, AVPacket *pkt)
1088 {
1089 if (pkt->size >= 7 &&
1090 pkt->size < INT_MAX - AVPROBE_PADDING_SIZE &&
1091 !strcmp(pkt->data, "GAB2") && AV_RL16(pkt->data + 5) == 2) {
1092 uint8_t desc[256];
1093 int score = AVPROBE_SCORE_EXTENSION, ret;
1094 AVIStream *ast = st->priv_data;
1095 ff_const59 AVInputFormat *sub_demuxer;
1096 AVRational time_base;
1097 int size;
1098 AVProbeData pd;
1099 unsigned int desc_len;
1100 AVIOContext *pb = avio_alloc_context(pkt->data + 7,
1101 pkt->size - 7,
1102 0, NULL, NULL, NULL, NULL);
1103 if (!pb)
1104 goto error;
1105
1106 desc_len = avio_rl32(pb);
1107
1108 if (desc_len > pb->buf_end - pb->buf_ptr)
1109 goto error;
1110
1111 ret = avio_get_str16le(pb, desc_len, desc, sizeof(desc));
1112 avio_skip(pb, desc_len - ret);
1113 if (*desc)
1114 av_dict_set(&st->metadata, "title", desc, 0);
1115
1116 avio_rl16(pb); /* flags? */
1117 avio_rl32(pb); /* data size */
1118
1119 size = pb->buf_end - pb->buf_ptr;
1120 pd = (AVProbeData) { .buf = av_mallocz(size + AVPROBE_PADDING_SIZE),
1121 .buf_size = size };
1122 if (!pd.buf)
1123 goto error;
1124 memcpy(pd.buf, pb->buf_ptr, size);
1125 sub_demuxer = av_probe_input_format2(&pd, 1, &score);
1126 av_freep(&pd.buf);
1127 if (!sub_demuxer)
1128 goto error;
1129
1130 if (strcmp(sub_demuxer->name, "srt") && strcmp(sub_demuxer->name, "ass"))
1131 goto error;
1132
1133 if (!(ast->sub_pkt = av_packet_alloc()))
1134 goto error;
1135
1136 if (!(ast->sub_ctx = avformat_alloc_context()))
1137 goto error;
1138
1139 ast->sub_ctx->pb = pb;
1140
1141 if (ff_copy_whiteblacklists(ast->sub_ctx, s) < 0)
1142 goto error;
1143
1144 if (!avformat_open_input(&ast->sub_ctx, "", sub_demuxer, NULL)) {
1145 if (ast->sub_ctx->nb_streams != 1)
1146 goto error;
1147 ff_read_packet(ast->sub_ctx, ast->sub_pkt);
1148 avcodec_parameters_copy(st->codecpar, ast->sub_ctx->streams[0]->codecpar);
1149 time_base = ast->sub_ctx->streams[0]->time_base;
1150 avpriv_set_pts_info(st, 64, time_base.num, time_base.den);
1151 }
1152 ast->sub_buffer = pkt->buf;
1153 pkt->buf = NULL;
1154 av_packet_unref(pkt);
1155 return 1;
1156
1157 error:
1158 av_packet_free(&ast->sub_pkt);
1159 av_freep(&ast->sub_ctx);
1160 avio_context_free(&pb);
1161 }
1162 return 0;
1163 }
1164
get_subtitle_pkt(AVFormatContext * s,AVStream * next_st,AVPacket * pkt)1165 static AVStream *get_subtitle_pkt(AVFormatContext *s, AVStream *next_st,
1166 AVPacket *pkt)
1167 {
1168 AVIStream *ast, *next_ast = next_st->priv_data;
1169 int64_t ts, next_ts, ts_min = INT64_MAX;
1170 AVStream *st, *sub_st = NULL;
1171 int i;
1172
1173 next_ts = av_rescale_q(next_ast->frame_offset, next_st->time_base,
1174 AV_TIME_BASE_Q);
1175
1176 for (i = 0; i < s->nb_streams; i++) {
1177 st = s->streams[i];
1178 ast = st->priv_data;
1179 if (st->discard < AVDISCARD_ALL && ast && ast->sub_pkt && ast->sub_pkt->data) {
1180 ts = av_rescale_q(ast->sub_pkt->dts, st->time_base, AV_TIME_BASE_Q);
1181 if (ts <= next_ts && ts < ts_min) {
1182 ts_min = ts;
1183 sub_st = st;
1184 }
1185 }
1186 }
1187
1188 if (sub_st) {
1189 ast = sub_st->priv_data;
1190 av_packet_move_ref(pkt, ast->sub_pkt);
1191 pkt->stream_index = sub_st->index;
1192
1193 if (ff_read_packet(ast->sub_ctx, ast->sub_pkt) < 0)
1194 ast->sub_pkt->data = NULL;
1195 }
1196 return sub_st;
1197 }
1198
get_stream_idx(const unsigned * d)1199 static int get_stream_idx(const unsigned *d)
1200 {
1201 if (d[0] >= '0' && d[0] <= '9' &&
1202 d[1] >= '0' && d[1] <= '9') {
1203 return (d[0] - '0') * 10 + (d[1] - '0');
1204 } else {
1205 return 100; // invalid stream ID
1206 }
1207 }
1208
1209 /**
1210 *
1211 * @param exit_early set to 1 to just gather packet position without making the changes needed to actually read & return the packet
1212 */
avi_sync(AVFormatContext * s,int exit_early)1213 static int avi_sync(AVFormatContext *s, int exit_early)
1214 {
1215 AVIContext *avi = s->priv_data;
1216 AVIOContext *pb = s->pb;
1217 int n;
1218 unsigned int d[8];
1219 unsigned int size;
1220 int64_t i, sync;
1221
1222 start_sync:
1223 memset(d, -1, sizeof(d));
1224 for (i = sync = avio_tell(pb); !avio_feof(pb); i++) {
1225 int j;
1226
1227 for (j = 0; j < 7; j++)
1228 d[j] = d[j + 1];
1229 d[7] = avio_r8(pb);
1230
1231 size = d[4] + (d[5] << 8) + (d[6] << 16) + (d[7] << 24);
1232
1233 n = get_stream_idx(d + 2);
1234 ff_tlog(s, "%X %X %X %X %X %X %X %X %"PRId64" %u %d\n",
1235 d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], i, size, n);
1236 if (i*(avi->io_fsize>0) + (uint64_t)size > avi->fsize || d[0] > 127)
1237 continue;
1238
1239 // parse ix##
1240 if ((d[0] == 'i' && d[1] == 'x' && n < s->nb_streams) ||
1241 // parse JUNK
1242 (d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K') ||
1243 (d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1') ||
1244 (d[0] == 'i' && d[1] == 'n' && d[2] == 'd' && d[3] == 'x')) {
1245 avio_skip(pb, size);
1246 goto start_sync;
1247 }
1248
1249 // parse stray LIST
1250 if (d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T') {
1251 avio_skip(pb, 4);
1252 goto start_sync;
1253 }
1254
1255 n = get_stream_idx(d);
1256
1257 if (!((i - avi->last_pkt_pos) & 1) &&
1258 get_stream_idx(d + 1) < s->nb_streams)
1259 continue;
1260
1261 // detect ##ix chunk and skip
1262 if (d[2] == 'i' && d[3] == 'x' && n < s->nb_streams) {
1263 avio_skip(pb, size);
1264 goto start_sync;
1265 }
1266
1267 if (d[2] == 'w' && d[3] == 'c' && n < s->nb_streams) {
1268 avio_skip(pb, 16 * 3 + 8);
1269 goto start_sync;
1270 }
1271
1272 if (avi->dv_demux && n != 0)
1273 continue;
1274
1275 // parse ##dc/##wb
1276 if (n < s->nb_streams) {
1277 AVStream *st;
1278 AVIStream *ast;
1279 st = s->streams[n];
1280 ast = st->priv_data;
1281
1282 if (!ast) {
1283 av_log(s, AV_LOG_WARNING, "Skipping foreign stream %d packet\n", n);
1284 continue;
1285 }
1286
1287 if (s->nb_streams >= 2) {
1288 AVStream *st1 = s->streams[1];
1289 AVIStream *ast1 = st1->priv_data;
1290 // workaround for broken small-file-bug402.avi
1291 if (ast1 && d[2] == 'w' && d[3] == 'b'
1292 && n == 0
1293 && st ->codecpar->codec_type == AVMEDIA_TYPE_VIDEO
1294 && st1->codecpar->codec_type == AVMEDIA_TYPE_AUDIO
1295 && ast->prefix == 'd'*256+'c'
1296 && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
1297 ) {
1298 n = 1;
1299 st = st1;
1300 ast = ast1;
1301 av_log(s, AV_LOG_WARNING,
1302 "Invalid stream + prefix combination, assuming audio.\n");
1303 }
1304 }
1305
1306 if (d[2] == 'p' && d[3] == 'c' && size <= 4 * 256 + 4) {
1307 int k = avio_r8(pb);
1308 int last = (k + avio_r8(pb) - 1) & 0xFF;
1309
1310 avio_rl16(pb); // flags
1311
1312 // b + (g << 8) + (r << 16);
1313 for (; k <= last; k++)
1314 ast->pal[k] = 0xFFU<<24 | avio_rb32(pb)>>8;
1315
1316 ast->has_pal = 1;
1317 goto start_sync;
1318 } else if (((ast->prefix_count < 5 || sync + 9 > i) &&
1319 d[2] < 128 && d[3] < 128) ||
1320 d[2] * 256 + d[3] == ast->prefix /* ||
1321 (d[2] == 'd' && d[3] == 'c') ||
1322 (d[2] == 'w' && d[3] == 'b') */) {
1323 if (exit_early)
1324 return 0;
1325 if (d[2] * 256 + d[3] == ast->prefix)
1326 ast->prefix_count++;
1327 else {
1328 ast->prefix = d[2] * 256 + d[3];
1329 ast->prefix_count = 0;
1330 }
1331
1332 if (!avi->dv_demux &&
1333 ((st->discard >= AVDISCARD_DEFAULT && size == 0) /* ||
1334 // FIXME: needs a little reordering
1335 (st->discard >= AVDISCARD_NONKEY &&
1336 !(pkt->flags & AV_PKT_FLAG_KEY)) */
1337 || st->discard >= AVDISCARD_ALL)) {
1338
1339 ast->frame_offset += get_duration(ast, size);
1340 avio_skip(pb, size);
1341 goto start_sync;
1342 }
1343
1344 avi->stream_index = n;
1345 ast->packet_size = size + 8;
1346 ast->remaining = size;
1347
1348 if (size) {
1349 uint64_t pos = avio_tell(pb) - 8;
1350 if (!st->index_entries || !st->nb_index_entries ||
1351 st->index_entries[st->nb_index_entries - 1].pos < pos) {
1352 av_add_index_entry(st, pos, ast->frame_offset, size,
1353 0, AVINDEX_KEYFRAME);
1354 }
1355 }
1356 return 0;
1357 }
1358 }
1359 }
1360
1361 if (pb->error)
1362 return pb->error;
1363 return AVERROR_EOF;
1364 }
1365
ni_prepare_read(AVFormatContext * s)1366 static int ni_prepare_read(AVFormatContext *s)
1367 {
1368 AVIContext *avi = s->priv_data;
1369 int best_stream_index = 0;
1370 AVStream *best_st = NULL;
1371 AVIStream *best_ast;
1372 int64_t best_ts = INT64_MAX;
1373 int i;
1374
1375 for (i = 0; i < s->nb_streams; i++) {
1376 AVStream *st = s->streams[i];
1377 AVIStream *ast = st->priv_data;
1378 int64_t ts = ast->frame_offset;
1379 int64_t last_ts;
1380
1381 if (!st->nb_index_entries)
1382 continue;
1383
1384 last_ts = st->index_entries[st->nb_index_entries - 1].timestamp;
1385 if (!ast->remaining && ts > last_ts)
1386 continue;
1387
1388 ts = av_rescale_q(ts, st->time_base,
1389 (AVRational) { FFMAX(1, ast->sample_size),
1390 AV_TIME_BASE });
1391
1392 av_log(s, AV_LOG_TRACE, "%"PRId64" %d/%d %"PRId64"\n", ts,
1393 st->time_base.num, st->time_base.den, ast->frame_offset);
1394 if (ts < best_ts) {
1395 best_ts = ts;
1396 best_st = st;
1397 best_stream_index = i;
1398 }
1399 }
1400 if (!best_st)
1401 return AVERROR_EOF;
1402
1403 best_ast = best_st->priv_data;
1404 best_ts = best_ast->frame_offset;
1405 if (best_ast->remaining) {
1406 i = av_index_search_timestamp(best_st,
1407 best_ts,
1408 AVSEEK_FLAG_ANY |
1409 AVSEEK_FLAG_BACKWARD);
1410 } else {
1411 i = av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
1412 if (i >= 0)
1413 best_ast->frame_offset = best_st->index_entries[i].timestamp;
1414 }
1415
1416 if (i >= 0) {
1417 int64_t pos = best_st->index_entries[i].pos;
1418 pos += best_ast->packet_size - best_ast->remaining;
1419 if (avio_seek(s->pb, pos + 8, SEEK_SET) < 0)
1420 return AVERROR_EOF;
1421
1422 av_assert0(best_ast->remaining <= best_ast->packet_size);
1423
1424 avi->stream_index = best_stream_index;
1425 if (!best_ast->remaining)
1426 best_ast->packet_size =
1427 best_ast->remaining = best_st->index_entries[i].size;
1428 }
1429 else
1430 return AVERROR_EOF;
1431
1432 return 0;
1433 }
1434
avi_read_packet(AVFormatContext * s,AVPacket * pkt)1435 static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
1436 {
1437 AVIContext *avi = s->priv_data;
1438 AVIOContext *pb = s->pb;
1439 int err;
1440
1441 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1442 int size = avpriv_dv_get_packet(avi->dv_demux, pkt);
1443 if (size >= 0)
1444 return size;
1445 else
1446 goto resync;
1447 }
1448
1449 if (avi->non_interleaved) {
1450 err = ni_prepare_read(s);
1451 if (err < 0)
1452 return err;
1453 }
1454
1455 resync:
1456 if (avi->stream_index >= 0) {
1457 AVStream *st = s->streams[avi->stream_index];
1458 AVIStream *ast = st->priv_data;
1459 int dv_demux = CONFIG_DV_DEMUXER && avi->dv_demux;
1460 int size, err;
1461
1462 if (get_subtitle_pkt(s, st, pkt))
1463 return 0;
1464
1465 // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
1466 if (ast->sample_size <= 1)
1467 size = INT_MAX;
1468 else if (ast->sample_size < 32)
1469 // arbitrary multiplier to avoid tiny packets for raw PCM data
1470 size = 1024 * ast->sample_size;
1471 else
1472 size = ast->sample_size;
1473
1474 if (size > ast->remaining)
1475 size = ast->remaining;
1476 avi->last_pkt_pos = avio_tell(pb);
1477 err = av_get_packet(pb, pkt, size);
1478 if (err < 0)
1479 return err;
1480 size = err;
1481
1482 if (ast->has_pal && pkt->size < (unsigned)INT_MAX / 2 && !dv_demux) {
1483 uint8_t *pal;
1484 pal = av_packet_new_side_data(pkt,
1485 AV_PKT_DATA_PALETTE,
1486 AVPALETTE_SIZE);
1487 if (!pal) {
1488 av_log(s, AV_LOG_ERROR,
1489 "Failed to allocate data for palette\n");
1490 } else {
1491 memcpy(pal, ast->pal, AVPALETTE_SIZE);
1492 ast->has_pal = 0;
1493 }
1494 }
1495
1496 if (CONFIG_DV_DEMUXER && dv_demux) {
1497 AVBufferRef *avbuf = pkt->buf;
1498 size = avpriv_dv_produce_packet(avi->dv_demux, pkt,
1499 pkt->data, pkt->size, pkt->pos);
1500 pkt->buf = avbuf;
1501 pkt->flags |= AV_PKT_FLAG_KEY;
1502 if (size < 0)
1503 av_packet_unref(pkt);
1504 } else if (st->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE &&
1505 !st->codecpar->codec_tag && read_gab2_sub(s, st, pkt)) {
1506 ast->frame_offset++;
1507 avi->stream_index = -1;
1508 ast->remaining = 0;
1509 goto resync;
1510 } else {
1511 /* XXX: How to handle B-frames in AVI? */
1512 pkt->dts = ast->frame_offset;
1513 // pkt->dts += ast->start;
1514 if (ast->sample_size)
1515 pkt->dts /= ast->sample_size;
1516 pkt->stream_index = avi->stream_index;
1517
1518 if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && st->index_entries) {
1519 AVIndexEntry *e;
1520 int index;
1521
1522 index = av_index_search_timestamp(st, ast->frame_offset, AVSEEK_FLAG_ANY);
1523 e = &st->index_entries[index];
1524
1525 if (index >= 0 && e->timestamp == ast->frame_offset) {
1526 if (index == st->nb_index_entries-1) {
1527 int key=1;
1528 uint32_t state=-1;
1529 if (st->codecpar->codec_id == AV_CODEC_ID_MPEG4) {
1530 const uint8_t *ptr = pkt->data, *end = ptr + FFMIN(size, 256);
1531 while (ptr < end) {
1532 ptr = avpriv_find_start_code(ptr, end, &state);
1533 if (state == 0x1B6 && ptr < end) {
1534 key = !(*ptr & 0xC0);
1535 break;
1536 }
1537 }
1538 }
1539 if (!key)
1540 e->flags &= ~AVINDEX_KEYFRAME;
1541 }
1542 if (e->flags & AVINDEX_KEYFRAME)
1543 pkt->flags |= AV_PKT_FLAG_KEY;
1544 }
1545 } else {
1546 pkt->flags |= AV_PKT_FLAG_KEY;
1547 }
1548 ast->frame_offset += get_duration(ast, pkt->size);
1549 }
1550 ast->remaining -= err;
1551 if (!ast->remaining) {
1552 avi->stream_index = -1;
1553 ast->packet_size = 0;
1554 }
1555
1556 if (!avi->non_interleaved && pkt->pos >= 0 && ast->seek_pos > pkt->pos) {
1557 av_packet_unref(pkt);
1558 goto resync;
1559 }
1560 ast->seek_pos= 0;
1561
1562 if (!avi->non_interleaved && st->nb_index_entries>1 && avi->index_loaded>1) {
1563 int64_t dts= av_rescale_q(pkt->dts, st->time_base, AV_TIME_BASE_Q);
1564
1565 if (avi->dts_max < dts) {
1566 avi->dts_max = dts;
1567 } else if (avi->dts_max - (uint64_t)dts > 2*AV_TIME_BASE) {
1568 avi->non_interleaved= 1;
1569 av_log(s, AV_LOG_INFO, "Switching to NI mode, due to poor interleaving\n");
1570 }
1571 }
1572
1573 return 0;
1574 }
1575
1576 if ((err = avi_sync(s, 0)) < 0)
1577 return err;
1578 goto resync;
1579 }
1580
1581 /* XXX: We make the implicit supposition that the positions are sorted
1582 * for each stream. */
avi_read_idx1(AVFormatContext * s,int size)1583 static int avi_read_idx1(AVFormatContext *s, int size)
1584 {
1585 AVIContext *avi = s->priv_data;
1586 AVIOContext *pb = s->pb;
1587 int nb_index_entries, i;
1588 AVStream *st;
1589 AVIStream *ast;
1590 int64_t pos;
1591 unsigned int index, tag, flags, len, first_packet = 1;
1592 int64_t last_pos = -1;
1593 unsigned last_idx = -1;
1594 int64_t idx1_pos, first_packet_pos = 0, data_offset = 0;
1595 int anykey = 0;
1596
1597 nb_index_entries = size / 16;
1598 if (nb_index_entries <= 0)
1599 return AVERROR_INVALIDDATA;
1600
1601 idx1_pos = avio_tell(pb);
1602 avio_seek(pb, avi->movi_list + 4, SEEK_SET);
1603 if (avi_sync(s, 1) == 0)
1604 first_packet_pos = avio_tell(pb) - 8;
1605 avi->stream_index = -1;
1606 avio_seek(pb, idx1_pos, SEEK_SET);
1607
1608 if (s->nb_streams == 1 && s->streams[0]->codecpar->codec_tag == AV_RL32("MMES")) {
1609 first_packet_pos = 0;
1610 data_offset = avi->movi_list;
1611 }
1612
1613 /* Read the entries and sort them in each stream component. */
1614 for (i = 0; i < nb_index_entries; i++) {
1615 if (avio_feof(pb))
1616 return -1;
1617
1618 tag = avio_rl32(pb);
1619 flags = avio_rl32(pb);
1620 pos = avio_rl32(pb);
1621 len = avio_rl32(pb);
1622 av_log(s, AV_LOG_TRACE, "%d: tag=0x%x flags=0x%x pos=0x%"PRIx64" len=%d/",
1623 i, tag, flags, pos, len);
1624
1625 index = ((tag & 0xff) - '0') * 10;
1626 index += (tag >> 8 & 0xff) - '0';
1627 if (index >= s->nb_streams)
1628 continue;
1629 st = s->streams[index];
1630 ast = st->priv_data;
1631
1632 /* Skip 'xxpc' palette change entries in the index until a logic
1633 * to process these is properly implemented. */
1634 if ((tag >> 16 & 0xff) == 'p' && (tag >> 24 & 0xff) == 'c')
1635 continue;
1636
1637 if (first_packet && first_packet_pos) {
1638 if (avi->movi_list + 4 != pos || pos + 500 > first_packet_pos)
1639 data_offset = first_packet_pos - pos;
1640 first_packet = 0;
1641 }
1642 pos += data_offset;
1643
1644 av_log(s, AV_LOG_TRACE, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
1645
1646 // even if we have only a single stream, we should
1647 // switch to non-interleaved to get correct timestamps
1648 if (last_pos == pos)
1649 avi->non_interleaved = 1;
1650 if (last_idx != pos && len) {
1651 av_add_index_entry(st, pos, ast->cum_len, len, 0,
1652 (flags & AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
1653 last_idx= pos;
1654 }
1655 ast->cum_len += get_duration(ast, len);
1656 last_pos = pos;
1657 anykey |= flags&AVIIF_INDEX;
1658 }
1659 if (!anykey) {
1660 for (index = 0; index < s->nb_streams; index++) {
1661 st = s->streams[index];
1662 if (st->nb_index_entries)
1663 st->index_entries[0].flags |= AVINDEX_KEYFRAME;
1664 }
1665 }
1666 return 0;
1667 }
1668
1669 /* Scan the index and consider any file with streams more than
1670 * 2 seconds or 64MB apart non-interleaved. */
check_stream_max_drift(AVFormatContext * s)1671 static int check_stream_max_drift(AVFormatContext *s)
1672 {
1673 int64_t min_pos, pos;
1674 int i;
1675 int *idx = av_mallocz_array(s->nb_streams, sizeof(*idx));
1676 if (!idx)
1677 return AVERROR(ENOMEM);
1678 for (min_pos = pos = 0; min_pos != INT64_MAX; pos = min_pos + 1LU) {
1679 int64_t max_dts = INT64_MIN / 2;
1680 int64_t min_dts = INT64_MAX / 2;
1681 int64_t max_buffer = 0;
1682
1683 min_pos = INT64_MAX;
1684
1685 for (i = 0; i < s->nb_streams; i++) {
1686 AVStream *st = s->streams[i];
1687 AVIStream *ast = st->priv_data;
1688 int n = st->nb_index_entries;
1689 while (idx[i] < n && st->index_entries[idx[i]].pos < pos)
1690 idx[i]++;
1691 if (idx[i] < n) {
1692 int64_t dts;
1693 dts = av_rescale_q(st->index_entries[idx[i]].timestamp /
1694 FFMAX(ast->sample_size, 1),
1695 st->time_base, AV_TIME_BASE_Q);
1696 min_dts = FFMIN(min_dts, dts);
1697 min_pos = FFMIN(min_pos, st->index_entries[idx[i]].pos);
1698 }
1699 }
1700 for (i = 0; i < s->nb_streams; i++) {
1701 AVStream *st = s->streams[i];
1702 AVIStream *ast = st->priv_data;
1703
1704 if (idx[i] && min_dts != INT64_MAX / 2) {
1705 int64_t dts, delta_dts;
1706 dts = av_rescale_q(st->index_entries[idx[i] - 1].timestamp /
1707 FFMAX(ast->sample_size, 1),
1708 st->time_base, AV_TIME_BASE_Q);
1709 delta_dts = av_sat_sub64(dts, min_dts);
1710 max_dts = FFMAX(max_dts, dts);
1711 max_buffer = FFMAX(max_buffer,
1712 av_rescale(delta_dts,
1713 st->codecpar->bit_rate,
1714 AV_TIME_BASE));
1715 }
1716 }
1717 if (av_sat_sub64(max_dts, min_dts) > 2 * AV_TIME_BASE ||
1718 max_buffer > 1024 * 1024 * 8 * 8) {
1719 av_free(idx);
1720 return 1;
1721 }
1722 }
1723 av_free(idx);
1724 return 0;
1725 }
1726
guess_ni_flag(AVFormatContext * s)1727 static int guess_ni_flag(AVFormatContext *s)
1728 {
1729 int i;
1730 int64_t last_start = 0;
1731 int64_t first_end = INT64_MAX;
1732 int64_t oldpos = avio_tell(s->pb);
1733
1734 for (i = 0; i < s->nb_streams; i++) {
1735 AVStream *st = s->streams[i];
1736 int n = st->nb_index_entries;
1737 unsigned int size;
1738
1739 if (n <= 0)
1740 continue;
1741
1742 if (n >= 2) {
1743 int64_t pos = st->index_entries[0].pos;
1744 unsigned tag[2];
1745 avio_seek(s->pb, pos, SEEK_SET);
1746 tag[0] = avio_r8(s->pb);
1747 tag[1] = avio_r8(s->pb);
1748 avio_rl16(s->pb);
1749 size = avio_rl32(s->pb);
1750 if (get_stream_idx(tag) == i && pos + size > st->index_entries[1].pos)
1751 last_start = INT64_MAX;
1752 if (get_stream_idx(tag) == i && size == st->index_entries[0].size + 8)
1753 last_start = INT64_MAX;
1754 }
1755
1756 if (st->index_entries[0].pos > last_start)
1757 last_start = st->index_entries[0].pos;
1758 if (st->index_entries[n - 1].pos < first_end)
1759 first_end = st->index_entries[n - 1].pos;
1760 }
1761 avio_seek(s->pb, oldpos, SEEK_SET);
1762
1763 if (last_start > first_end)
1764 return 1;
1765
1766 return check_stream_max_drift(s);
1767 }
1768
avi_load_index(AVFormatContext * s)1769 static int avi_load_index(AVFormatContext *s)
1770 {
1771 AVIContext *avi = s->priv_data;
1772 AVIOContext *pb = s->pb;
1773 uint32_t tag, size;
1774 int64_t pos = avio_tell(pb);
1775 int64_t next;
1776 int ret = -1;
1777
1778 if (avio_seek(pb, avi->movi_end, SEEK_SET) < 0)
1779 goto the_end; // maybe truncated file
1780 av_log(s, AV_LOG_TRACE, "movi_end=0x%"PRIx64"\n", avi->movi_end);
1781 for (;;) {
1782 tag = avio_rl32(pb);
1783 size = avio_rl32(pb);
1784 if (avio_feof(pb))
1785 break;
1786 next = avio_tell(pb);
1787 if (next < 0 || next > INT64_MAX - size - (size & 1))
1788 break;
1789 next += size + (size & 1LL);
1790
1791 if (tag == MKTAG('i', 'd', 'x', '1') &&
1792 avi_read_idx1(s, size) >= 0) {
1793 avi->index_loaded=2;
1794 ret = 0;
1795 }else if (tag == MKTAG('L', 'I', 'S', 'T')) {
1796 uint32_t tag1 = avio_rl32(pb);
1797
1798 if (tag1 == MKTAG('I', 'N', 'F', 'O'))
1799 ff_read_riff_info(s, size - 4);
1800 }else if (!ret)
1801 break;
1802
1803 if (avio_seek(pb, next, SEEK_SET) < 0)
1804 break; // something is wrong here
1805 }
1806
1807 the_end:
1808 avio_seek(pb, pos, SEEK_SET);
1809 return ret;
1810 }
1811
seek_subtitle(AVStream * st,AVStream * st2,int64_t timestamp)1812 static void seek_subtitle(AVStream *st, AVStream *st2, int64_t timestamp)
1813 {
1814 AVIStream *ast2 = st2->priv_data;
1815 int64_t ts2 = av_rescale_q(timestamp, st->time_base, st2->time_base);
1816 av_packet_unref(ast2->sub_pkt);
1817 if (avformat_seek_file(ast2->sub_ctx, 0, INT64_MIN, ts2, ts2, 0) >= 0 ||
1818 avformat_seek_file(ast2->sub_ctx, 0, ts2, ts2, INT64_MAX, 0) >= 0)
1819 ff_read_packet(ast2->sub_ctx, ast2->sub_pkt);
1820 }
1821
avi_read_seek(AVFormatContext * s,int stream_index,int64_t timestamp,int flags)1822 static int avi_read_seek(AVFormatContext *s, int stream_index,
1823 int64_t timestamp, int flags)
1824 {
1825 AVIContext *avi = s->priv_data;
1826 AVStream *st;
1827 int i, index;
1828 int64_t pos, pos_min;
1829 AVIStream *ast;
1830
1831 /* Does not matter which stream is requested dv in avi has the
1832 * stream information in the first video stream.
1833 */
1834 if (avi->dv_demux)
1835 stream_index = 0;
1836
1837 if (!avi->index_loaded) {
1838 /* we only load the index on demand */
1839 avi_load_index(s);
1840 avi->index_loaded |= 1;
1841 }
1842 av_assert0(stream_index >= 0);
1843
1844 st = s->streams[stream_index];
1845 ast = st->priv_data;
1846 index = av_index_search_timestamp(st,
1847 timestamp * FFMAX(ast->sample_size, 1),
1848 flags);
1849 if (index < 0) {
1850 if (st->nb_index_entries > 0)
1851 av_log(s, AV_LOG_DEBUG, "Failed to find timestamp %"PRId64 " in index %"PRId64 " .. %"PRId64 "\n",
1852 timestamp * FFMAX(ast->sample_size, 1),
1853 st->index_entries[0].timestamp,
1854 st->index_entries[st->nb_index_entries - 1].timestamp);
1855 return AVERROR_INVALIDDATA;
1856 }
1857
1858 /* find the position */
1859 pos = st->index_entries[index].pos;
1860 timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1);
1861
1862 av_log(s, AV_LOG_TRACE, "XX %"PRId64" %d %"PRId64"\n",
1863 timestamp, index, st->index_entries[index].timestamp);
1864
1865 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1866 /* One and only one real stream for DV in AVI, and it has video */
1867 /* offsets. Calling with other stream indexes should have failed */
1868 /* the av_index_search_timestamp call above. */
1869
1870 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
1871 return -1;
1872
1873 /* Feed the DV video stream version of the timestamp to the */
1874 /* DV demux so it can synthesize correct timestamps. */
1875 ff_dv_offset_reset(avi->dv_demux, timestamp);
1876
1877 avi->stream_index = -1;
1878 return 0;
1879 }
1880
1881 pos_min = pos;
1882 for (i = 0; i < s->nb_streams; i++) {
1883 AVStream *st2 = s->streams[i];
1884 AVIStream *ast2 = st2->priv_data;
1885
1886 ast2->packet_size =
1887 ast2->remaining = 0;
1888
1889 if (ast2->sub_ctx) {
1890 seek_subtitle(st, st2, timestamp);
1891 continue;
1892 }
1893
1894 if (st2->nb_index_entries <= 0)
1895 continue;
1896
1897 // av_assert1(st2->codecpar->block_align);
1898 index = av_index_search_timestamp(st2,
1899 av_rescale_q(timestamp,
1900 st->time_base,
1901 st2->time_base) *
1902 FFMAX(ast2->sample_size, 1),
1903 flags |
1904 AVSEEK_FLAG_BACKWARD |
1905 (st2->codecpar->codec_type != AVMEDIA_TYPE_VIDEO ? AVSEEK_FLAG_ANY : 0));
1906 if (index < 0)
1907 index = 0;
1908 ast2->seek_pos = st2->index_entries[index].pos;
1909 pos_min = FFMIN(pos_min,ast2->seek_pos);
1910 }
1911 for (i = 0; i < s->nb_streams; i++) {
1912 AVStream *st2 = s->streams[i];
1913 AVIStream *ast2 = st2->priv_data;
1914
1915 if (ast2->sub_ctx || st2->nb_index_entries <= 0)
1916 continue;
1917
1918 index = av_index_search_timestamp(
1919 st2,
1920 av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
1921 flags | AVSEEK_FLAG_BACKWARD | (st2->codecpar->codec_type != AVMEDIA_TYPE_VIDEO ? AVSEEK_FLAG_ANY : 0));
1922 if (index < 0)
1923 index = 0;
1924 while (!avi->non_interleaved && index>0 && st2->index_entries[index-1].pos >= pos_min)
1925 index--;
1926 ast2->frame_offset = st2->index_entries[index].timestamp;
1927 }
1928
1929 /* do the seek */
1930 if (avio_seek(s->pb, pos_min, SEEK_SET) < 0) {
1931 av_log(s, AV_LOG_ERROR, "Seek failed\n");
1932 return -1;
1933 }
1934 avi->stream_index = -1;
1935 avi->dts_max = INT_MIN;
1936 return 0;
1937 }
1938
avi_read_close(AVFormatContext * s)1939 static int avi_read_close(AVFormatContext *s)
1940 {
1941 int i;
1942 AVIContext *avi = s->priv_data;
1943
1944 for (i = 0; i < s->nb_streams; i++) {
1945 AVStream *st = s->streams[i];
1946 AVIStream *ast = st->priv_data;
1947 if (ast) {
1948 if (ast->sub_ctx) {
1949 av_freep(&ast->sub_ctx->pb);
1950 avformat_close_input(&ast->sub_ctx);
1951 }
1952 av_buffer_unref(&ast->sub_buffer);
1953 av_packet_free(&ast->sub_pkt);
1954 }
1955 }
1956
1957 av_freep(&avi->dv_demux);
1958
1959 return 0;
1960 }
1961
avi_probe(const AVProbeData * p)1962 static int avi_probe(const AVProbeData *p)
1963 {
1964 int i;
1965
1966 /* check file header */
1967 for (i = 0; avi_headers[i][0]; i++)
1968 if (AV_RL32(p->buf ) == AV_RL32(avi_headers[i] ) &&
1969 AV_RL32(p->buf + 8) == AV_RL32(avi_headers[i] + 4))
1970 return AVPROBE_SCORE_MAX;
1971
1972 return 0;
1973 }
1974
1975 AVInputFormat ff_avi_demuxer = {
1976 .name = "avi",
1977 .long_name = NULL_IF_CONFIG_SMALL("AVI (Audio Video Interleaved)"),
1978 .priv_data_size = sizeof(AVIContext),
1979 .extensions = "avi",
1980 .read_probe = avi_probe,
1981 .read_header = avi_read_header,
1982 .read_packet = avi_read_packet,
1983 .read_close = avi_read_close,
1984 .read_seek = avi_read_seek,
1985 .priv_class = &demuxer_class,
1986 };
1987