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avcodec/x86/h264_idct: Fix ff_h264_luma_dc_dequant_idct_sse2 checkasm failures
[ffmpeg.git] / libavformat / avidec.c
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 "config_components.h"
23
24 #include <inttypes.h>
25
26 #include "libavutil/avassert.h"
27 #include "libavutil/avstring.h"
28 #include "libavutil/mem.h"
29 #include "libavutil/opt.h"
30 #include "libavutil/dict.h"
31 #include "libavutil/integer.h"
32 #include "libavutil/internal.h"
33 #include "libavutil/intreadwrite.h"
34 #include "libavutil/mathematics.h"
35 #include "avformat.h"
36 #include "avi.h"
37 #include "demux.h"
38 #include "dv.h"
39 #include "internal.h"
40 #include "isom.h"
41 #include "riff.h"
42 #include "libavcodec/bytestream.h"
43 #include "libavcodec/exif.h"
44 #include "libavcodec/startcode.h"
45
46 typedef struct AVIStream {
47 int64_t frame_offset; /* current frame (video) or byte (audio) counter
48 * (used to compute the pts) */
49 int remaining;
50 int packet_size;
51
52 uint32_t handler;
53 uint32_t scale;
54 uint32_t rate;
55 int sample_size; /* size of one sample (or packet)
56 * (in the rate/scale sense) in bytes */
57
58 int64_t cum_len; /* temporary storage (used during seek) */
59 int prefix; /* normally 'd'<<8 + 'c' or 'w'<<8 + 'b' */
60 int prefix_count;
61 uint32_t pal[256];
62 int has_pal;
63 int dshow_block_align; /* block align variable used to emulate bugs in
64 * the MS dshow demuxer */
65
66 AVFormatContext *sub_ctx;
67 AVPacket *sub_pkt;
68 AVBufferRef *sub_buffer;
69
70 int64_t seek_pos;
71 } AVIStream;
72
73 typedef struct AVIContext {
74 const AVClass *class;
75 int64_t riff_end;
76 int64_t movi_end;
77 int64_t fsize;
78 int64_t io_fsize;
79 int64_t movi_list;
80 int64_t last_pkt_pos;
81 int index_loaded;
82 int is_odml;
83 int non_interleaved;
84 int stream_index;
85 DVDemuxContext *dv_demux;
86 int odml_depth;
87 int64_t odml_read;
88 int64_t odml_max_pos;
89 int use_odml;
90 #define MAX_ODML_DEPTH 1000
91 int64_t dts_max;
92 } AVIContext;
93
94
95 static const AVOption options[] = {
96 { "use_odml", "use odml index", offsetof(AVIContext, use_odml), AV_OPT_TYPE_BOOL, {.i64 = 1}, -1, 1, AV_OPT_FLAG_DECODING_PARAM},
97 { NULL },
98 };
99
100 static const AVClass demuxer_class = {
101 .class_name = "avi",
102 .item_name = av_default_item_name,
103 .option = options,
104 .version = LIBAVUTIL_VERSION_INT,
105 .category = AV_CLASS_CATEGORY_DEMUXER,
106 };
107
108
109 static const char avi_headers[][8] = {
110 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', ' ' },
111 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 'X' },
112 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 0x19 },
113 { 'O', 'N', '2', ' ', 'O', 'N', '2', 'f' },
114 { 'R', 'I', 'F', 'F', 'A', 'M', 'V', ' ' },
115 { 0 }
116 };
117
118 static const AVMetadataConv avi_metadata_conv[] = {
119 { "strn", "title" },
120 { "isbj", "subject" },
121 { "inam", "title" },
122 { "iart", "artist" },
123 { "icop", "copyright" },
124 { "icmt", "comment" },
125 { "ignr", "genre" },
126 { "iprd", "product" },
127 { "isft", "software" },
128
129 { 0 },
130 };
131
132 static int avi_load_index(AVFormatContext *s);
133 static int guess_ni_flag(AVFormatContext *s);
134
135 #define print_tag(s, str, tag, size) \
136 av_log(s, AV_LOG_TRACE, "pos:%"PRIX64" %s: tag=%s size=0x%x\n", \
137 avio_tell(pb), str, av_fourcc2str(tag), size) \
138
139 static inline int get_duration(AVIStream *ast, int len)
140 {
141 if (ast->sample_size)
142 return len;
143 else if (ast->dshow_block_align)
144 return (len + (int64_t)ast->dshow_block_align - 1) / ast->dshow_block_align;
145 else
146 return 1;
147 }
148
149 static int get_riff(AVFormatContext *s, AVIOContext *pb)
150 {
151 AVIContext *avi = s->priv_data;
152 char header[8] = {0};
153 int i;
154
155 /* check RIFF header */
156 avio_read(pb, header, 4);
157 avi->riff_end = avio_rl32(pb); /* RIFF chunk size */
158 avi->riff_end += avio_tell(pb); /* RIFF chunk end */
159 avio_read(pb, header + 4, 4);
160
161 for (i = 0; avi_headers[i][0]; i++)
162 if (!memcmp(header, avi_headers[i], 8))
163 break;
164 if (!avi_headers[i][0])
165 return AVERROR_INVALIDDATA;
166
167 if (header[7] == 0x19)
168 av_log(s, AV_LOG_INFO,
169 "This file has been generated by a totally broken muxer.\n");
170
171 return 0;
172 }
173
174 static int read_odml_index(AVFormatContext *s, int64_t frame_num)
175 {
176 AVIContext *avi = s->priv_data;
177 AVIOContext *pb = s->pb;
178 int longs_per_entry = avio_rl16(pb);
179 int index_sub_type = avio_r8(pb);
180 int index_type = avio_r8(pb);
181 int entries_in_use = avio_rl32(pb);
182 int chunk_id = avio_rl32(pb);
183 int64_t base = avio_rl64(pb);
184 int stream_id = ((chunk_id & 0xFF) - '0') * 10 +
185 ((chunk_id >> 8 & 0xFF) - '0');
186 AVStream *st;
187 AVIStream *ast;
188 int i;
189 int64_t last_pos = -1;
190 int64_t filesize = avi->fsize;
191
192 av_log(s, AV_LOG_TRACE,
193 "longs_per_entry:%d index_type:%d entries_in_use:%d "
194 "chunk_id:%X base:%16"PRIX64" frame_num:%"PRId64"\n",
195 longs_per_entry,
196 index_type,
197 entries_in_use,
198 chunk_id,
199 base,
200 frame_num);
201
202 if (stream_id >= s->nb_streams || stream_id < 0)
203 return AVERROR_INVALIDDATA;
204 st = s->streams[stream_id];
205 ast = st->priv_data;
206
207 if (index_sub_type || entries_in_use < 0)
208 return AVERROR_INVALIDDATA;
209
210 avio_rl32(pb);
211
212 if (index_type && longs_per_entry != 2)
213 return AVERROR_INVALIDDATA;
214 if (index_type > 1)
215 return AVERROR_INVALIDDATA;
216
217 if (filesize > 0 && base >= filesize) {
218 av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
219 if (base >> 32 == (base & 0xFFFFFFFF) &&
220 (base & 0xFFFFFFFF) < filesize &&
221 filesize <= 0xFFFFFFFF)
222 base &= 0xFFFFFFFF;
223 else
224 return AVERROR_INVALIDDATA;
225 }
226
227 for (i = 0; i < entries_in_use; i++) {
228 avi->odml_max_pos = FFMAX(avi->odml_max_pos, avio_tell(pb));
229
230 // If we read more than there are bytes then we must have been reading something twice
231 if (avi->odml_read > avi->odml_max_pos)
232 return AVERROR_INVALIDDATA;
233
234 if (index_type) {
235 int64_t pos = avio_rl32(pb) + base - 8;
236 int len = avio_rl32(pb);
237 int key = len >= 0;
238 len &= 0x7FFFFFFF;
239 avi->odml_read += 8;
240
241 av_log(s, AV_LOG_TRACE, "pos:%"PRId64", len:%X\n", pos, len);
242
243 if (avio_feof(pb))
244 return AVERROR_INVALIDDATA;
245
246 if (last_pos == pos || pos == base - 8)
247 avi->non_interleaved = 1;
248 if (last_pos != pos && len)
249 av_add_index_entry(st, pos, ast->cum_len, len, 0,
250 key ? AVINDEX_KEYFRAME : 0);
251
252 ast->cum_len += get_duration(ast, len);
253 last_pos = pos;
254 } else {
255 int64_t offset, pos;
256 int duration;
257 int ret;
258 avi->odml_read += 16;
259
260 offset = avio_rl64(pb);
261 avio_rl32(pb); /* size */
262 duration = avio_rl32(pb);
263
264 if (avio_feof(pb) || offset > INT64_MAX - 8)
265 return AVERROR_INVALIDDATA;
266
267 pos = avio_tell(pb);
268
269 if (avi->odml_depth > MAX_ODML_DEPTH) {
270 av_log(s, AV_LOG_ERROR, "Too deeply nested ODML indexes\n");
271 return AVERROR_INVALIDDATA;
272 }
273
274 if (avio_seek(pb, offset + 8, SEEK_SET) < 0)
275 return -1;
276 avi->odml_depth++;
277 ret = read_odml_index(s, frame_num);
278 avi->odml_depth--;
279 frame_num += duration;
280
281 if (avio_seek(pb, pos, SEEK_SET) < 0) {
282 av_log(s, AV_LOG_ERROR, "Failed to restore position after reading index\n");
283 return -1;
284 }
285 if (ret < 0)
286 return ret;
287 }
288 }
289 avi->index_loaded = 2;
290 return 0;
291 }
292
293 static void clean_index(AVFormatContext *s)
294 {
295 int i;
296 int64_t j;
297
298 for (i = 0; i < s->nb_streams; i++) {
299 AVStream *st = s->streams[i];
300 FFStream *const sti = ffstream(st);
301 AVIStream *ast = st->priv_data;
302 int n = sti->nb_index_entries;
303 int max = ast->sample_size;
304 int64_t pos, size, ts;
305
306 if (n != 1 || ast->sample_size == 0)
307 continue;
308
309 while (max < 1024)
310 max += max;
311
312 pos = sti->index_entries[0].pos;
313 size = sti->index_entries[0].size;
314 ts = sti->index_entries[0].timestamp;
315
316 for (j = 0; j < size; j += max)
317 av_add_index_entry(st, pos + j, ts + j, FFMIN(max, size - j), 0,
318 AVINDEX_KEYFRAME);
319 }
320 }
321
322 static int avi_read_tag(AVFormatContext *s, AVStream *st, uint32_t tag,
323 uint32_t size)
324 {
325 AVIOContext *pb = s->pb;
326 char key[5] = { 0 };
327 char *value;
328
329 size += (size & 1);
330
331 if (size == UINT_MAX)
332 return AVERROR(EINVAL);
333 value = av_malloc(size + 1);
334 if (!value)
335 return AVERROR(ENOMEM);
336 if (avio_read(pb, value, size) != size) {
337 av_freep(&value);
338 return AVERROR_INVALIDDATA;
339 }
340 value[size] = 0;
341
342 AV_WL32(key, tag);
343
344 return av_dict_set(st ? &st->metadata : &s->metadata, key, value,
345 AV_DICT_DONT_STRDUP_VAL);
346 }
347
348 static const char months[12][4] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
349 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
350
351 static void avi_metadata_creation_time(AVDictionary **metadata, char *date)
352 {
353 char month[4], time[9], buffer[64];
354 int i, day, year;
355 /* parse standard AVI date format (ie. "Mon Mar 10 15:04:43 2003") */
356 if (sscanf(date, "%*3s%*[ ]%3s%*[ ]%2d%*[ ]%8s%*[ ]%4d",
357 month, &day, time, &year) == 4) {
358 for (i = 0; i < 12; i++)
359 if (!av_strcasecmp(month, months[i])) {
360 snprintf(buffer, sizeof(buffer), "%.4d-%.2d-%.2d %s",
361 year, i + 1, day, time);
362 av_dict_set(metadata, "creation_time", buffer, 0);
363 }
364 } else if (date[4] == '/' && date[7] == '/') {
365 date[4] = date[7] = '-';
366 av_dict_set(metadata, "creation_time", date, 0);
367 }
368 }
369
370 static void avi_read_nikon(AVFormatContext *s, uint64_t end)
371 {
372 while (avio_tell(s->pb) < end && !avio_feof(s->pb)) {
373 uint32_t tag = avio_rl32(s->pb);
374 uint32_t size = avio_rl32(s->pb);
375 switch (tag) {
376 case MKTAG('n', 'c', 't', 'g'): /* Nikon Tags */
377 {
378 uint64_t tag_end = avio_tell(s->pb) + size;
379 while (avio_tell(s->pb) < tag_end && !avio_feof(s->pb)) {
380 uint16_t tag = avio_rl16(s->pb);
381 uint16_t size = avio_rl16(s->pb);
382 const char *name = NULL;
383 char buffer[64] = { 0 };
384 uint64_t remaining = tag_end - avio_tell(s->pb);
385 size = FFMIN(size, remaining);
386 size -= avio_read(s->pb, buffer,
387 FFMIN(size, sizeof(buffer) - 1));
388 switch (tag) {
389 case 0x03:
390 name = "maker";
391 break;
392 case 0x04:
393 name = "model";
394 break;
395 case 0x13:
396 name = "creation_time";
397 if (buffer[4] == ':' && buffer[7] == ':')
398 buffer[4] = buffer[7] = '-';
399 break;
400 }
401 if (name)
402 av_dict_set(&s->metadata, name, buffer, 0);
403 avio_skip(s->pb, size);
404 }
405 break;
406 }
407 default:
408 avio_skip(s->pb, size);
409 break;
410 }
411 }
412 }
413
414 static int avi_extract_stream_metadata(AVFormatContext *s, AVStream *st)
415 {
416 GetByteContext gb;
417 uint8_t *data = st->codecpar->extradata;
418 int data_size = st->codecpar->extradata_size;
419 int tag, offset;
420
421 if (!data || data_size < 8) {
422 return AVERROR_INVALIDDATA;
423 }
424
425 bytestream2_init(&gb, data, data_size);
426
427 tag = bytestream2_get_le32(&gb);
428
429 switch (tag) {
430 case MKTAG('A', 'V', 'I', 'F'): {
431 AVExifMetadata ifd = { 0 };
432 int ret;
433 // skip 4 byte padding
434 bytestream2_skip(&gb, 4);
435 offset = bytestream2_tell(&gb);
436
437 // decode EXIF tags from IFD, AVI is always little-endian
438 ret = av_exif_parse_buffer(s, data + offset, data_size - offset, &ifd, AV_EXIF_ASSUME_LE);
439 if (ret < 0)
440 return ret;
441 ret = av_exif_ifd_to_dict(s, &ifd, &st->metadata);
442 av_exif_free(&ifd);
443 return ret;
444 }
445 case MKTAG('C', 'A', 'S', 'I'):
446 avpriv_request_sample(s, "RIFF stream data tag type CASI (%u)", tag);
447 break;
448 case MKTAG('Z', 'o', 'r', 'a'):
449 avpriv_request_sample(s, "RIFF stream data tag type Zora (%u)", tag);
450 break;
451 default:
452 break;
453 }
454
455 return 0;
456 }
457
458 static int calculate_bitrate(AVFormatContext *s)
459 {
460 AVIContext *avi = s->priv_data;
461 int i, j;
462 int64_t lensum = 0;
463 int64_t maxpos = 0;
464
465 for (i = 0; i<s->nb_streams; i++) {
466 int64_t len = 0;
467 FFStream *const sti = ffstream(s->streams[i]);
468
469 if (!sti->nb_index_entries)
470 continue;
471
472 for (j = 0; j < sti->nb_index_entries; j++)
473 len += sti->index_entries[j].size;
474 maxpos = FFMAX(maxpos, sti->index_entries[j-1].pos);
475 lensum += len;
476 }
477 if (maxpos < av_rescale(avi->io_fsize, 9, 10)) // index does not cover the whole file
478 return 0;
479 if (lensum*9/10 > maxpos || lensum < maxpos*9/10) // frame sum and filesize mismatch
480 return 0;
481
482 for (i = 0; i<s->nb_streams; i++) {
483 int64_t len = 0;
484 AVStream *st = s->streams[i];
485 FFStream *const sti = ffstream(st);
486 int64_t duration;
487 AVInteger bitrate_i, den_i, num_i;
488
489 for (j = 0; j < sti->nb_index_entries; j++)
490 len += sti->index_entries[j].size;
491
492 if (sti->nb_index_entries < 2 || st->codecpar->bit_rate > 0)
493 continue;
494 duration = sti->index_entries[j-1].timestamp - sti->index_entries[0].timestamp;
495 den_i = av_mul_i(av_int2i(duration), av_int2i(st->time_base.num));
496 num_i = av_add_i(av_mul_i(av_int2i(8*len), av_int2i(st->time_base.den)), av_shr_i(den_i, 1));
497 bitrate_i = av_div_i(num_i, den_i);
498 if (av_cmp_i(bitrate_i, av_int2i(INT64_MAX)) <= 0) {
499 int64_t bitrate = av_i2int(bitrate_i);
500 if (bitrate > 0) {
501 st->codecpar->bit_rate = bitrate;
502 }
503 }
504 }
505 return 1;
506 }
507
508 static int avi_read_header(AVFormatContext *s)
509 {
510 AVIContext *avi = s->priv_data;
511 AVIOContext *pb = s->pb;
512 unsigned int tag, tag1, handler;
513 int codec_type, stream_index, frame_period;
514 unsigned int size;
515 int i;
516 AVStream *st;
517 AVIStream *ast = NULL;
518 int avih_width = 0, avih_height = 0;
519 int amv_file_format = 0;
520 uint64_t list_end = 0;
521 int64_t pos;
522 int ret;
523 AVDictionaryEntry *dict_entry;
524
525 avi->stream_index = -1;
526
527 ret = get_riff(s, pb);
528 if (ret < 0)
529 return ret;
530
531 av_log(avi, AV_LOG_DEBUG, "use odml:%d\n", avi->use_odml);
532
533 avi->io_fsize = avi->fsize = avio_size(pb);
534 if (avi->fsize <= 0 || avi->fsize < avi->riff_end)
535 avi->fsize = avi->riff_end == 8 ? INT64_MAX : avi->riff_end;
536
537 /* first list tag */
538 stream_index = -1;
539 codec_type = -1;
540 frame_period = 0;
541 for (;;) {
542 if (avio_feof(pb))
543 return AVERROR_INVALIDDATA;
544 tag = avio_rl32(pb);
545 size = avio_rl32(pb);
546
547 print_tag(s, "tag", tag, size);
548
549 switch (tag) {
550 case MKTAG('L', 'I', 'S', 'T'):
551 list_end = avio_tell(pb) + size;
552 /* Ignored, except at start of video packets. */
553 tag1 = avio_rl32(pb);
554
555 print_tag(s, "list", tag1, 0);
556
557 if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
558 avi->movi_list = avio_tell(pb) - 4;
559 if (size)
560 avi->movi_end = avi->movi_list + size + (size & 1);
561 else
562 avi->movi_end = avi->fsize;
563 av_log(s, AV_LOG_TRACE, "movi end=%"PRIx64"\n", avi->movi_end);
564 goto end_of_header;
565 } else if (tag1 == MKTAG('I', 'N', 'F', 'O'))
566 ff_read_riff_info(s, size - 4);
567 else if (tag1 == MKTAG('n', 'c', 'd', 't'))
568 avi_read_nikon(s, list_end);
569
570 break;
571 case MKTAG('I', 'D', 'I', 'T'):
572 {
573 unsigned char date[64] = { 0 };
574 size += (size & 1);
575 size -= avio_read(pb, date, FFMIN(size, sizeof(date) - 1));
576 avio_skip(pb, size);
577 avi_metadata_creation_time(&s->metadata, date);
578 break;
579 }
580 case MKTAG('d', 'm', 'l', 'h'):
581 avi->is_odml = 1;
582 avio_skip(pb, size + (size & 1));
583 break;
584 case MKTAG('a', 'm', 'v', 'h'):
585 amv_file_format = 1;
586 case MKTAG('a', 'v', 'i', 'h'):
587 /* AVI header */
588 /* using frame_period is bad idea */
589 frame_period = avio_rl32(pb);
590 avio_rl32(pb); /* max. bytes per second */
591 avio_rl32(pb);
592 avi->non_interleaved |= avio_rl32(pb) & AVIF_MUSTUSEINDEX;
593
594 avio_skip(pb, 2 * 4);
595 avio_rl32(pb);
596 avio_rl32(pb);
597 avih_width = avio_rl32(pb);
598 avih_height = avio_rl32(pb);
599
600 avio_skip(pb, size - 10 * 4);
601 break;
602 case MKTAG('s', 't', 'r', 'h'):
603 /* stream header */
604
605 tag1 = avio_rl32(pb);
606 handler = avio_rl32(pb); /* codec tag */
607
608 if (tag1 == MKTAG('p', 'a', 'd', 's')) {
609 avio_skip(pb, size - 8);
610 break;
611 } else {
612 stream_index++;
613 st = avformat_new_stream(s, NULL);
614 if (!st)
615 return AVERROR(ENOMEM);
616
617 st->id = stream_index;
618 ast = av_mallocz(sizeof(AVIStream));
619 if (!ast)
620 return AVERROR(ENOMEM);
621 st->priv_data = ast;
622 }
623 if (amv_file_format)
624 tag1 = stream_index ? MKTAG('a', 'u', 'd', 's')
625 : MKTAG('v', 'i', 'd', 's');
626
627 print_tag(s, "strh", tag1, -1);
628
629 if (tag1 == MKTAG('i', 'a', 'v', 's') ||
630 tag1 == MKTAG('i', 'v', 'a', 's')) {
631 int64_t dv_dur;
632
633 /* After some consideration -- I don't think we
634 * have to support anything but DV in type1 AVIs. */
635 if (s->nb_streams != 1)
636 return AVERROR_INVALIDDATA;
637
638 if (handler != MKTAG('d', 'v', 's', 'd') &&
639 handler != MKTAG('d', 'v', 'h', 'd') &&
640 handler != MKTAG('d', 'v', 's', 'l'))
641 return AVERROR_INVALIDDATA;
642
643 if (!CONFIG_DV_DEMUXER)
644 return AVERROR_DEMUXER_NOT_FOUND;
645
646 ast = s->streams[0]->priv_data;
647 st->priv_data = NULL;
648 ff_remove_stream(s, st);
649
650 avi->dv_demux = avpriv_dv_init_demux(s);
651 if (!avi->dv_demux) {
652 av_free(ast);
653 return AVERROR(ENOMEM);
654 }
655
656 s->streams[0]->priv_data = ast;
657 avio_skip(pb, 3 * 4);
658 ast->scale = avio_rl32(pb);
659 ast->rate = avio_rl32(pb);
660 avio_skip(pb, 4); /* start time */
661
662 dv_dur = avio_rl32(pb);
663 if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
664 dv_dur *= AV_TIME_BASE;
665 s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
666 }
667 /* else, leave duration alone; timing estimation in utils.c
668 * will make a guess based on bitrate. */
669
670 stream_index = s->nb_streams - 1;
671 avio_skip(pb, size - 9 * 4);
672 break;
673 }
674
675 av_assert0(stream_index < s->nb_streams);
676 ast->handler = handler;
677
678 avio_rl32(pb); /* flags */
679 avio_rl16(pb); /* priority */
680 avio_rl16(pb); /* language */
681 avio_rl32(pb); /* initial frame */
682 ast->scale = avio_rl32(pb);
683 ast->rate = avio_rl32(pb);
684 if (!(ast->scale && ast->rate)) {
685 av_log(s, AV_LOG_WARNING,
686 "scale/rate is %"PRIu32"/%"PRIu32" which is invalid. "
687 "(This file has been generated by broken software.)\n",
688 ast->scale,
689 ast->rate);
690 if (frame_period) {
691 ast->rate = 1000000;
692 ast->scale = frame_period;
693 } else {
694 ast->rate = 25;
695 ast->scale = 1;
696 }
697 }
698 avpriv_set_pts_info(st, 64, ast->scale, ast->rate);
699
700 ast->cum_len = avio_rl32(pb); /* start */
701 st->nb_frames = avio_rl32(pb);
702
703 st->start_time = 0;
704 avio_rl32(pb); /* buffer size */
705 avio_rl32(pb); /* quality */
706 if (ast->cum_len > 3600LL * ast->rate / ast->scale) {
707 av_log(s, AV_LOG_ERROR, "crazy start time, iam scared, giving up\n");
708 ast->cum_len = 0;
709 }
710 ast->sample_size = avio_rl32(pb);
711 ast->cum_len *= FFMAX(1, ast->sample_size);
712 av_log(s, AV_LOG_TRACE, "%"PRIu32" %"PRIu32" %d\n",
713 ast->rate, ast->scale, ast->sample_size);
714
715 switch (tag1) {
716 case MKTAG('v', 'i', 'd', 's'):
717 codec_type = AVMEDIA_TYPE_VIDEO;
718
719 ast->sample_size = 0;
720 st->avg_frame_rate = av_inv_q(st->time_base);
721 break;
722 case MKTAG('a', 'u', 'd', 's'):
723 codec_type = AVMEDIA_TYPE_AUDIO;
724 break;
725 case MKTAG('t', 'x', 't', 's'):
726 codec_type = AVMEDIA_TYPE_SUBTITLE;
727 break;
728 case MKTAG('d', 'a', 't', 's'):
729 codec_type = AVMEDIA_TYPE_DATA;
730 break;
731 default:
732 av_log(s, AV_LOG_INFO, "unknown stream type %X\n", tag1);
733 }
734
735 if (ast->sample_size < 0) {
736 if (s->error_recognition & AV_EF_EXPLODE) {
737 av_log(s, AV_LOG_ERROR,
738 "Invalid sample_size %d at stream %d\n",
739 ast->sample_size,
740 stream_index);
741 return AVERROR_INVALIDDATA;
742 }
743 av_log(s, AV_LOG_WARNING,
744 "Invalid sample_size %d at stream %d "
745 "setting it to 0\n",
746 ast->sample_size,
747 stream_index);
748 ast->sample_size = 0;
749 }
750
751 if (ast->sample_size == 0) {
752 st->duration = st->nb_frames;
753 if (st->duration > 0 && avi->io_fsize > 0 && avi->riff_end > avi->io_fsize) {
754 av_log(s, AV_LOG_DEBUG, "File is truncated adjusting duration\n");
755 st->duration = av_rescale(st->duration, avi->io_fsize, avi->riff_end);
756 }
757 }
758 ast->frame_offset = ast->cum_len;
759 avio_skip(pb, size - 12 * 4);
760 break;
761 case MKTAG('s', 't', 'r', 'f'):
762 /* stream header */
763 if (!size && (codec_type == AVMEDIA_TYPE_AUDIO ||
764 codec_type == AVMEDIA_TYPE_VIDEO))
765 break;
766 if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
767 avio_skip(pb, size);
768 } else {
769 uint64_t cur_pos = avio_tell(pb);
770 FFStream *sti;
771 unsigned esize;
772 if (cur_pos < list_end)
773 size = FFMIN(size, list_end - cur_pos);
774 st = s->streams[stream_index];
775 sti = ffstream(st);
776 if (st->codecpar->codec_type != AVMEDIA_TYPE_UNKNOWN) {
777 avio_skip(pb, size);
778 break;
779 }
780 switch (codec_type) {
781 case AVMEDIA_TYPE_VIDEO:
782 if (amv_file_format) {
783 st->codecpar->width = avih_width;
784 st->codecpar->height = avih_height;
785 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
786 st->codecpar->codec_id = AV_CODEC_ID_AMV;
787 avio_skip(pb, size);
788 break;
789 }
790 tag1 = ff_get_bmp_header(pb, st, &esize);
791
792 if (tag1 == MKTAG('D', 'X', 'S', 'B') ||
793 tag1 == MKTAG('D', 'X', 'S', 'A')) {
794 st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
795 st->codecpar->codec_tag = tag1;
796 st->codecpar->codec_id = AV_CODEC_ID_XSUB;
797 break;
798 }
799
800 if (size > 10 * 4 && size < (1 << 30) && size < avi->fsize) {
801 if (esize == size-1 && (esize&1)) {
802 st->codecpar->extradata_size = esize - 10 * 4;
803 } else
804 st->codecpar->extradata_size = size - 10 * 4;
805 if (st->codecpar->extradata) {
806 av_log(s, AV_LOG_WARNING, "New extradata in strf chunk, freeing previous one.\n");
807 }
808 ret = ff_get_extradata(s, st->codecpar, pb,
809 st->codecpar->extradata_size);
810 if (ret < 0)
811 return ret;
812 }
813
814 // FIXME: check if the encoder really did this correctly
815 if (st->codecpar->extradata_size & 1)
816 avio_r8(pb);
817
818 /* Extract palette from extradata if bpp <= 8.
819 * This code assumes that extradata contains only palette.
820 * This is true for all paletted codecs implemented in
821 * FFmpeg. */
822 if (st->codecpar->extradata_size &&
823 (st->codecpar->bits_per_coded_sample <= 8)) {
824 int pal_size = (1 << st->codecpar->bits_per_coded_sample) << 2;
825 const uint8_t *pal_src;
826
827 pal_size = FFMIN(pal_size, st->codecpar->extradata_size);
828 pal_src = st->codecpar->extradata +
829 st->codecpar->extradata_size - pal_size;
830 /* Exclude the "BottomUp" field from the palette */
831 if (pal_src - st->codecpar->extradata >= 9 &&
832 !memcmp(st->codecpar->extradata + st->codecpar->extradata_size - 9, "BottomUp", 9))
833 pal_src -= 9;
834 for (i = 0; i < pal_size / 4; i++)
835 ast->pal[i] = 0xFFU<<24 | AV_RL32(pal_src + 4 * i);
836 ast->has_pal = 1;
837 }
838
839 print_tag(s, "video", tag1, 0);
840
841 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
842 st->codecpar->codec_tag = tag1;
843 st->codecpar->codec_id = ff_codec_get_id(ff_codec_bmp_tags,
844 tag1);
845 /* If codec is not found yet, try with the mov tags. */
846 if (!st->codecpar->codec_id) {
847 st->codecpar->codec_id =
848 ff_codec_get_id(ff_codec_movvideo_tags, tag1);
849 if (st->codecpar->codec_id)
850 av_log(s, AV_LOG_WARNING,
851 "mov tag found in avi (fourcc %s)\n",
852 av_fourcc2str(tag1));
853 }
854 if (!st->codecpar->codec_id)
855 st->codecpar->codec_id = ff_codec_get_id(ff_codec_bmp_tags_unofficial, tag1);
856
857 /* This is needed to get the pict type which is necessary
858 * for generating correct pts. */
859 sti->need_parsing = AVSTREAM_PARSE_HEADERS;
860
861 if (st->codecpar->codec_id == AV_CODEC_ID_MPEG4 &&
862 ast->handler == MKTAG('X', 'V', 'I', 'D'))
863 st->codecpar->codec_tag = MKTAG('X', 'V', 'I', 'D');
864
865 if (st->codecpar->codec_tag == MKTAG('V', 'S', 'S', 'H'))
866 sti->need_parsing = AVSTREAM_PARSE_FULL;
867 if (st->codecpar->codec_id == AV_CODEC_ID_RV40)
868 sti->need_parsing = AVSTREAM_PARSE_NONE;
869 if (st->codecpar->codec_id == AV_CODEC_ID_HEVC &&
870 st->codecpar->codec_tag == MKTAG('H', '2', '6', '5'))
871 sti->need_parsing = AVSTREAM_PARSE_FULL;
872
873 if (st->codecpar->codec_id == AV_CODEC_ID_AVRN &&
874 st->codecpar->codec_tag == MKTAG('A', 'V', 'R', 'n') &&
875 (st->codecpar->extradata_size < 31 ||
876 memcmp(&st->codecpar->extradata[28], "1:1", 3)))
877 st->codecpar->codec_id = AV_CODEC_ID_MJPEG;
878
879 if (st->codecpar->codec_tag == 0 && st->codecpar->height > 0 &&
880 st->codecpar->extradata_size < 1U << 30) {
881 st->codecpar->extradata_size += 9;
882 if ((ret = av_reallocp(&st->codecpar->extradata,
883 st->codecpar->extradata_size +
884 AV_INPUT_BUFFER_PADDING_SIZE)) < 0) {
885 st->codecpar->extradata_size = 0;
886 return ret;
887 } else
888 memcpy(st->codecpar->extradata + st->codecpar->extradata_size - 9,
889 "BottomUp", 9);
890 }
891 if (st->codecpar->height == INT_MIN)
892 return AVERROR_INVALIDDATA;
893 st->codecpar->height = FFABS(st->codecpar->height);
894
895 // avio_skip(pb, size - 5 * 4);
896 break;
897 case AVMEDIA_TYPE_AUDIO:
898 ret = ff_get_wav_header(s, pb, st->codecpar, size, 0);
899 if (ret < 0)
900 return ret;
901 ast->dshow_block_align = st->codecpar->block_align;
902 if (ast->sample_size && st->codecpar->block_align &&
903 ast->sample_size != st->codecpar->block_align) {
904 av_log(s,
905 AV_LOG_WARNING,
906 "sample size (%d) != block align (%d)\n",
907 ast->sample_size,
908 st->codecpar->block_align);
909 ast->sample_size = st->codecpar->block_align;
910 }
911 /* 2-aligned
912 * (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
913 if (size & 1)
914 avio_skip(pb, 1);
915 /* Force parsing as several audio frames can be in
916 * one packet and timestamps refer to packet start. */
917 sti->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
918 /* ADTS header is in extradata, AAC without header must be
919 * stored as exact frames. Parser not needed and it will
920 * fail. */
921 if (st->codecpar->codec_id == AV_CODEC_ID_AAC &&
922 st->codecpar->extradata_size)
923 sti->need_parsing = AVSTREAM_PARSE_NONE;
924 // The flac parser does not work with AVSTREAM_PARSE_TIMESTAMPS
925 if (st->codecpar->codec_id == AV_CODEC_ID_FLAC)
926 sti->need_parsing = AVSTREAM_PARSE_NONE;
927 /* AVI files with Xan DPCM audio (wrongly) declare PCM
928 * audio in the header but have Axan as stream_code_tag. */
929 if (ast->handler == AV_RL32("Axan")) {
930 st->codecpar->codec_id = AV_CODEC_ID_XAN_DPCM;
931 st->codecpar->codec_tag = 0;
932 ast->dshow_block_align = 0;
933 }
934 if (amv_file_format) {
935 st->codecpar->codec_id = AV_CODEC_ID_ADPCM_IMA_AMV;
936 ast->dshow_block_align = 0;
937 }
938 if ((st->codecpar->codec_id == AV_CODEC_ID_AAC ||
939 st->codecpar->codec_id == AV_CODEC_ID_FTR ||
940 st->codecpar->codec_id == AV_CODEC_ID_FLAC ||
941 st->codecpar->codec_id == AV_CODEC_ID_MP2 ) && ast->dshow_block_align <= 4 && ast->dshow_block_align) {
942 av_log(s, AV_LOG_DEBUG, "overriding invalid dshow_block_align of %d\n", ast->dshow_block_align);
943 ast->dshow_block_align = 0;
944 }
945 if (st->codecpar->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align == 1024 && ast->sample_size == 1024 ||
946 st->codecpar->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align == 4096 && ast->sample_size == 4096 ||
947 st->codecpar->codec_id == AV_CODEC_ID_MP3 && ast->dshow_block_align == 1152 && ast->sample_size == 1152) {
948 av_log(s, AV_LOG_DEBUG, "overriding sample_size\n");
949 ast->sample_size = 0;
950 }
951 break;
952 case AVMEDIA_TYPE_SUBTITLE:
953 st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
954 sti->request_probe = 1;
955 avio_skip(pb, size);
956 break;
957 default:
958 st->codecpar->codec_type = AVMEDIA_TYPE_DATA;
959 st->codecpar->codec_id = AV_CODEC_ID_NONE;
960 st->codecpar->codec_tag = 0;
961 avio_skip(pb, size);
962 break;
963 }
964 }
965 break;
966 case MKTAG('s', 't', 'r', 'd'):
967 if (stream_index >= (unsigned)s->nb_streams
968 || s->streams[stream_index]->codecpar->extradata_size
969 || s->streams[stream_index]->codecpar->codec_tag == MKTAG('H','2','6','4')) {
970 avio_skip(pb, size);
971 } else {
972 uint64_t cur_pos = avio_tell(pb);
973 if (cur_pos < list_end)
974 size = FFMIN(size, list_end - cur_pos);
975 st = s->streams[stream_index];
976
977 if (size<(1<<30)) {
978 if (st->codecpar->extradata) {
979 av_log(s, AV_LOG_WARNING, "New extradata in strd chunk, freeing previous one.\n");
980 }
981 if ((ret = ff_get_extradata(s, st->codecpar, pb, size)) < 0)
982 return ret;
983 }
984
985 if (st->codecpar->extradata_size & 1) //FIXME check if the encoder really did this correctly
986 avio_r8(pb);
987
988 ret = avi_extract_stream_metadata(s, st);
989 if (ret < 0) {
990 av_log(s, AV_LOG_WARNING, "could not decoding EXIF data in stream header.\n");
991 }
992 }
993 break;
994 case MKTAG('i', 'n', 'd', 'x'):
995 pos = avio_tell(pb);
996 if ((pb->seekable & AVIO_SEEKABLE_NORMAL) && !(s->flags & AVFMT_FLAG_IGNIDX) &&
997 avi->use_odml &&
998 read_odml_index(s, 0) < 0 &&
999 (s->error_recognition & AV_EF_EXPLODE))
1000 return AVERROR_INVALIDDATA;
1001 avio_seek(pb, pos + size, SEEK_SET);
1002 break;
1003 case MKTAG('v', 'p', 'r', 'p'):
1004 if (stream_index < (unsigned)s->nb_streams && size > 9 * 4) {
1005 AVRational active, active_aspect;
1006
1007 st = s->streams[stream_index];
1008 avio_rl32(pb);
1009 avio_rl32(pb);
1010 avio_rl32(pb);
1011 avio_rl32(pb);
1012 avio_rl32(pb);
1013
1014 active_aspect.den = avio_rl16(pb);
1015 active_aspect.num = avio_rl16(pb);
1016 active.num = avio_rl32(pb);
1017 active.den = avio_rl32(pb);
1018 avio_rl32(pb); // nbFieldsPerFrame
1019
1020 if (active_aspect.num && active_aspect.den &&
1021 active.num && active.den) {
1022 st->sample_aspect_ratio = av_div_q(active_aspect, active);
1023 av_log(s, AV_LOG_TRACE, "vprp %d/%d %d/%d\n",
1024 active_aspect.num, active_aspect.den,
1025 active.num, active.den);
1026 }
1027 size -= 9 * 4;
1028 }
1029 avio_skip(pb, size);
1030 break;
1031 case MKTAG('s', 't', 'r', 'n'):
1032 case MKTAG('i', 's', 'b', 'j'):
1033 case MKTAG('i', 'n', 'a', 'm'):
1034 case MKTAG('i', 'a', 'r', 't'):
1035 case MKTAG('i', 'c', 'o', 'p'):
1036 case MKTAG('i', 'c', 'm', 't'):
1037 case MKTAG('i', 'g', 'n', 'r'):
1038 case MKTAG('i', 'p', 'o', 'd'):
1039 case MKTAG('i', 's', 'o', 'f'):
1040 if (s->nb_streams) {
1041 ret = avi_read_tag(s, s->streams[s->nb_streams - 1], tag, size);
1042 if (ret < 0)
1043 return ret;
1044 break;
1045 }
1046 default:
1047 if (size > 1000000) {
1048 av_log(s, AV_LOG_ERROR,
1049 "Something went wrong during header parsing, "
1050 "tag %s has size %u, "
1051 "I will ignore it and try to continue anyway.\n",
1052 av_fourcc2str(tag), size);
1053 if (s->error_recognition & AV_EF_EXPLODE)
1054 return AVERROR_INVALIDDATA;
1055 avi->movi_list = avio_tell(pb) - 4;
1056 avi->movi_end = avi->fsize;
1057 goto end_of_header;
1058 }
1059 /* Do not fail for very large idx1 tags */
1060 case MKTAG('i', 'd', 'x', '1'):
1061 /* skip tag */
1062 size += (size & 1);
1063 avio_skip(pb, size);
1064 break;
1065 }
1066 }
1067
1068 end_of_header:
1069 /* check stream number */
1070 if (stream_index != s->nb_streams - 1)
1071 return AVERROR_INVALIDDATA;
1072
1073 if (!avi->index_loaded && (pb->seekable & AVIO_SEEKABLE_NORMAL))
1074 avi_load_index(s);
1075 calculate_bitrate(s);
1076 avi->index_loaded |= 1;
1077
1078 if ((ret = guess_ni_flag(s)) < 0)
1079 return ret;
1080
1081 avi->non_interleaved |= ret | (s->flags & AVFMT_FLAG_SORT_DTS);
1082
1083 dict_entry = av_dict_get(s->metadata, "ISFT", NULL, 0);
1084 if (dict_entry && !strcmp(dict_entry->value, "PotEncoder"))
1085 for (i = 0; i < s->nb_streams; i++) {
1086 AVStream *st = s->streams[i];
1087 if ( st->codecpar->codec_id == AV_CODEC_ID_MPEG1VIDEO
1088 || st->codecpar->codec_id == AV_CODEC_ID_MPEG2VIDEO)
1089 ffstream(st)->need_parsing = AVSTREAM_PARSE_FULL;
1090 }
1091
1092 for (i = 0; i < s->nb_streams; i++) {
1093 AVStream *st = s->streams[i];
1094 if (ffstream(st)->nb_index_entries)
1095 break;
1096 }
1097 // DV-in-AVI cannot be non-interleaved, if set this must be
1098 // a mis-detection.
1099 if (avi->dv_demux)
1100 avi->non_interleaved = 0;
1101 if (i == s->nb_streams && avi->non_interleaved) {
1102 av_log(s, AV_LOG_WARNING,
1103 "Non-interleaved AVI without index, switching to interleaved\n");
1104 avi->non_interleaved = 0;
1105 }
1106
1107 if (avi->non_interleaved) {
1108 av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
1109 clean_index(s);
1110 }
1111
1112 ff_metadata_conv_ctx(s, NULL, avi_metadata_conv);
1113 ff_metadata_conv_ctx(s, NULL, ff_riff_info_conv);
1114
1115 return 0;
1116 }
1117
1118 static int read_gab2_sub(AVFormatContext *s, AVStream *st, AVPacket *pkt)
1119 {
1120 if (pkt->size >= 7 &&
1121 pkt->size < INT_MAX - AVPROBE_PADDING_SIZE &&
1122 !strcmp(pkt->data, "GAB2") && AV_RL16(pkt->data + 5) == 2) {
1123 uint8_t desc[256];
1124 int score = AVPROBE_SCORE_EXTENSION, ret;
1125 AVIStream *ast = st->priv_data;
1126 const AVInputFormat *sub_demuxer;
1127 AVRational time_base;
1128 int size;
1129 AVProbeData pd;
1130 unsigned int desc_len;
1131
1132 if (ast->sub_ctx)
1133 return 0;
1134
1135 AVIOContext *pb = avio_alloc_context(pkt->data + 7,
1136 pkt->size - 7,
1137 0, NULL, NULL, NULL, NULL);
1138 if (!pb)
1139 goto error;
1140
1141 desc_len = avio_rl32(pb);
1142
1143 if (desc_len > pb->buf_end - pb->buf_ptr)
1144 goto error;
1145
1146 ret = avio_get_str16le(pb, desc_len, desc, sizeof(desc));
1147 avio_skip(pb, desc_len - ret);
1148 if (*desc)
1149 av_dict_set(&st->metadata, "title", desc, 0);
1150
1151 avio_rl16(pb); /* flags? */
1152 avio_rl32(pb); /* data size */
1153
1154 size = pb->buf_end - pb->buf_ptr;
1155 pd = (AVProbeData) { .buf = av_mallocz(size + AVPROBE_PADDING_SIZE),
1156 .buf_size = size };
1157 if (!pd.buf)
1158 goto error;
1159 memcpy(pd.buf, pb->buf_ptr, size);
1160 sub_demuxer = av_probe_input_format2(&pd, 1, &score);
1161 av_freep(&pd.buf);
1162 if (!sub_demuxer)
1163 goto error;
1164
1165 if (strcmp(sub_demuxer->name, "srt") && strcmp(sub_demuxer->name, "ass"))
1166 goto error;
1167
1168 if (!(ast->sub_pkt = av_packet_alloc()))
1169 goto error;
1170
1171 if (!(ast->sub_ctx = avformat_alloc_context()))
1172 goto error;
1173
1174 ast->sub_ctx->pb = pb;
1175
1176 if (ff_copy_whiteblacklists(ast->sub_ctx, s) < 0)
1177 goto error;
1178
1179 if (!avformat_open_input(&ast->sub_ctx, "", sub_demuxer, NULL)) {
1180 if (ast->sub_ctx->nb_streams != 1)
1181 goto error;
1182 ff_read_packet(ast->sub_ctx, ast->sub_pkt);
1183 avcodec_parameters_copy(st->codecpar, ast->sub_ctx->streams[0]->codecpar);
1184 time_base = ast->sub_ctx->streams[0]->time_base;
1185 avpriv_set_pts_info(st, 64, time_base.num, time_base.den);
1186 }
1187 ast->sub_buffer = pkt->buf;
1188 pkt->buf = NULL;
1189 av_packet_unref(pkt);
1190 return 1;
1191
1192 error:
1193 av_packet_free(&ast->sub_pkt);
1194 av_freep(&ast->sub_ctx);
1195 avio_context_free(&pb);
1196 }
1197 return 0;
1198 }
1199
1200 static AVStream *get_subtitle_pkt(AVFormatContext *s, AVStream *next_st,
1201 AVPacket *pkt)
1202 {
1203 AVIStream *ast, *next_ast = next_st->priv_data;
1204 int64_t ts, next_ts, ts_min = INT64_MAX;
1205 AVStream *st, *sub_st = NULL;
1206 int i;
1207
1208 next_ts = av_rescale_q(next_ast->frame_offset, next_st->time_base,
1209 AV_TIME_BASE_Q);
1210
1211 for (i = 0; i < s->nb_streams; i++) {
1212 st = s->streams[i];
1213 ast = st->priv_data;
1214 if (st->discard < AVDISCARD_ALL && ast && ast->sub_pkt && ast->sub_pkt->data) {
1215 ts = av_rescale_q(ast->sub_pkt->dts, st->time_base, AV_TIME_BASE_Q);
1216 if (ts <= next_ts && ts < ts_min) {
1217 ts_min = ts;
1218 sub_st = st;
1219 }
1220 }
1221 }
1222
1223 if (sub_st) {
1224 ast = sub_st->priv_data;
1225 av_packet_move_ref(pkt, ast->sub_pkt);
1226 pkt->stream_index = sub_st->index;
1227
1228 if (ff_read_packet(ast->sub_ctx, ast->sub_pkt) < 0)
1229 ast->sub_pkt->data = NULL;
1230 }
1231 return sub_st;
1232 }
1233
1234 static int get_stream_idx(const unsigned *d)
1235 {
1236 if (d[0] >= '0' && d[0] <= '9' &&
1237 d[1] >= '0' && d[1] <= '9') {
1238 return (d[0] - '0') * 10 + (d[1] - '0');
1239 } else {
1240 return 100; // invalid stream ID
1241 }
1242 }
1243
1244 /**
1245 *
1246 * @param exit_early set to 1 to just gather packet position without making the changes needed to actually read & return the packet
1247 */
1248 static int avi_sync(AVFormatContext *s, int exit_early)
1249 {
1250 AVIContext *avi = s->priv_data;
1251 AVIOContext *pb = s->pb;
1252 int n;
1253 unsigned int d[8];
1254 unsigned int size;
1255 int64_t i, sync;
1256
1257 start_sync:
1258 memset(d, -1, sizeof(d));
1259 for (i = sync = avio_tell(pb); !avio_feof(pb); i++) {
1260 int j;
1261
1262 for (j = 0; j < 7; j++)
1263 d[j] = d[j + 1];
1264 d[7] = avio_r8(pb);
1265
1266 size = d[4] + (d[5] << 8) + (d[6] << 16) + (d[7] << 24);
1267
1268 n = get_stream_idx(d + 2);
1269 ff_tlog(s, "%X %X %X %X %X %X %X %X %"PRId64" %u %d\n",
1270 d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], i, size, n);
1271 if (i*(avi->io_fsize>0) + (uint64_t)size > avi->fsize || d[0] > 127)
1272 continue;
1273
1274 // parse ix##
1275 if ((d[0] == 'i' && d[1] == 'x' && n < s->nb_streams) ||
1276 // parse JUNK
1277 (d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K') ||
1278 (d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1') ||
1279 (d[0] == 'i' && d[1] == 'n' && d[2] == 'd' && d[3] == 'x')) {
1280 avio_skip(pb, size);
1281 goto start_sync;
1282 }
1283
1284 // parse stray LIST
1285 if (d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T') {
1286 avio_skip(pb, 4);
1287 goto start_sync;
1288 }
1289
1290 n = get_stream_idx(d);
1291
1292 if (!((i - avi->last_pkt_pos) & 1) &&
1293 get_stream_idx(d + 1) < s->nb_streams)
1294 continue;
1295
1296 // detect ##ix chunk and skip
1297 if (d[2] == 'i' && d[3] == 'x' && n < s->nb_streams) {
1298 avio_skip(pb, size);
1299 goto start_sync;
1300 }
1301
1302 if (d[2] == 'w' && d[3] == 'c' && n < s->nb_streams) {
1303 avio_skip(pb, 16 * 3 + 8);
1304 goto start_sync;
1305 }
1306
1307 if (avi->dv_demux && n != 0)
1308 continue;
1309
1310 // parse ##dc/##wb
1311 if (n < s->nb_streams) {
1312 AVStream *st;
1313 AVIStream *ast;
1314 st = s->streams[n];
1315 ast = st->priv_data;
1316
1317 if (!ast) {
1318 av_log(s, AV_LOG_WARNING, "Skipping foreign stream %d packet\n", n);
1319 continue;
1320 }
1321
1322 if (s->nb_streams >= 2) {
1323 AVStream *st1 = s->streams[1];
1324 AVIStream *ast1 = st1->priv_data;
1325 // workaround for broken small-file-bug402.avi
1326 if (ast1 && d[2] == 'w' && d[3] == 'b'
1327 && n == 0
1328 && st ->codecpar->codec_type == AVMEDIA_TYPE_VIDEO
1329 && st1->codecpar->codec_type == AVMEDIA_TYPE_AUDIO
1330 && ast->prefix == 'd'*256+'c'
1331 && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
1332 ) {
1333 n = 1;
1334 st = st1;
1335 ast = ast1;
1336 av_log(s, AV_LOG_WARNING,
1337 "Invalid stream + prefix combination, assuming audio.\n");
1338 }
1339 }
1340
1341 if (d[2] == 'p' && d[3] == 'c' && size <= 4 * 256 + 4) {
1342 int k = avio_r8(pb);
1343 int last = (k + avio_r8(pb) - 1) & 0xFF;
1344
1345 avio_rl16(pb); // flags
1346
1347 // b + (g << 8) + (r << 16);
1348 for (; k <= last; k++)
1349 ast->pal[k] = 0xFFU<<24 | avio_rb32(pb)>>8;
1350
1351 ast->has_pal = 1;
1352 goto start_sync;
1353 } else if (((ast->prefix_count < 5 || sync + 9 > i) &&
1354 d[2] < 128 && d[3] < 128) ||
1355 d[2] * 256 + d[3] == ast->prefix /* ||
1356 (d[2] == 'd' && d[3] == 'c') ||
1357 (d[2] == 'w' && d[3] == 'b') */) {
1358 if (exit_early)
1359 return 0;
1360 if (d[2] * 256 + d[3] == ast->prefix)
1361 ast->prefix_count++;
1362 else {
1363 ast->prefix = d[2] * 256 + d[3];
1364 ast->prefix_count = 0;
1365 }
1366
1367 if (!avi->dv_demux &&
1368 ((st->discard >= AVDISCARD_DEFAULT && size == 0) /* ||
1369 // FIXME: needs a little reordering
1370 (st->discard >= AVDISCARD_NONKEY &&
1371 !(pkt->flags & AV_PKT_FLAG_KEY)) */
1372 || st->discard >= AVDISCARD_ALL)) {
1373
1374 ast->frame_offset += get_duration(ast, size);
1375 avio_skip(pb, size);
1376 goto start_sync;
1377 }
1378
1379 avi->stream_index = n;
1380 ast->packet_size = size + 8;
1381 ast->remaining = size;
1382
1383 if (size) {
1384 FFStream *const sti = ffstream(st);
1385 uint64_t pos = avio_tell(pb) - 8;
1386 if (!sti->index_entries || !sti->nb_index_entries ||
1387 sti->index_entries[sti->nb_index_entries - 1].pos < pos) {
1388 av_add_index_entry(st, pos, ast->frame_offset, size,
1389 0, AVINDEX_KEYFRAME);
1390 }
1391 }
1392 return 0;
1393 }
1394 }
1395 }
1396
1397 if (pb->error)
1398 return pb->error;
1399 return AVERROR_EOF;
1400 }
1401
1402 static int ni_prepare_read(AVFormatContext *s)
1403 {
1404 AVIContext *avi = s->priv_data;
1405 int best_stream_index = 0;
1406 AVStream *best_st = NULL;
1407 FFStream *best_sti;
1408 AVIStream *best_ast;
1409 int64_t best_ts = INT64_MAX;
1410 int i;
1411
1412 for (i = 0; i < s->nb_streams; i++) {
1413 AVStream *st = s->streams[i];
1414 FFStream *const sti = ffstream(st);
1415 AVIStream *ast = st->priv_data;
1416 int64_t ts = ast->frame_offset;
1417 int64_t last_ts;
1418
1419 if (!sti->nb_index_entries)
1420 continue;
1421
1422 last_ts = sti->index_entries[sti->nb_index_entries - 1].timestamp;
1423 if (!ast->remaining && ts > last_ts)
1424 continue;
1425
1426 ts = av_rescale_q(ts, st->time_base,
1427 (AVRational) { FFMAX(1, ast->sample_size),
1428 AV_TIME_BASE });
1429
1430 av_log(s, AV_LOG_TRACE, "%"PRId64" %d/%d %"PRId64"\n", ts,
1431 st->time_base.num, st->time_base.den, ast->frame_offset);
1432 if (ts < best_ts) {
1433 best_ts = ts;
1434 best_st = st;
1435 best_stream_index = i;
1436 }
1437 }
1438 if (!best_st)
1439 return AVERROR_EOF;
1440
1441 best_sti = ffstream(best_st);
1442 best_ast = best_st->priv_data;
1443 best_ts = best_ast->frame_offset;
1444 if (best_ast->remaining) {
1445 i = av_index_search_timestamp(best_st,
1446 best_ts,
1447 AVSEEK_FLAG_ANY |
1448 AVSEEK_FLAG_BACKWARD);
1449 } else {
1450 i = av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
1451 if (i >= 0)
1452 best_ast->frame_offset = best_sti->index_entries[i].timestamp;
1453 }
1454
1455 if (i >= 0) {
1456 int64_t pos = best_sti->index_entries[i].pos;
1457 pos += best_ast->packet_size - best_ast->remaining;
1458 if (avio_seek(s->pb, pos + 8, SEEK_SET) < 0)
1459 return AVERROR_EOF;
1460
1461 av_assert0(best_ast->remaining <= best_ast->packet_size);
1462
1463 avi->stream_index = best_stream_index;
1464 if (!best_ast->remaining)
1465 best_ast->packet_size =
1466 best_ast->remaining = best_sti->index_entries[i].size;
1467 }
1468 else
1469 return AVERROR_EOF;
1470
1471 return 0;
1472 }
1473
1474 static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
1475 {
1476 AVIContext *avi = s->priv_data;
1477 AVIOContext *pb = s->pb;
1478 int err;
1479
1480 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1481 int size = avpriv_dv_get_packet(avi->dv_demux, pkt);
1482 if (size >= 0)
1483 return size;
1484 else
1485 goto resync;
1486 }
1487
1488 if (avi->non_interleaved) {
1489 err = ni_prepare_read(s);
1490 if (err < 0)
1491 return err;
1492 }
1493
1494 resync:
1495 if (avi->stream_index >= 0) {
1496 AVStream *st = s->streams[avi->stream_index];
1497 FFStream *const sti = ffstream(st);
1498 AVIStream *ast = st->priv_data;
1499 int dv_demux = CONFIG_DV_DEMUXER && avi->dv_demux;
1500 int size, err;
1501
1502 if (get_subtitle_pkt(s, st, pkt))
1503 return 0;
1504
1505 // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
1506 if (ast->sample_size <= 1)
1507 size = INT_MAX;
1508 else if (ast->sample_size < 32)
1509 // arbitrary multiplier to avoid tiny packets for raw PCM data
1510 size = 1024 * ast->sample_size;
1511 else
1512 size = ast->sample_size;
1513
1514 if (size > ast->remaining)
1515 size = ast->remaining;
1516 avi->last_pkt_pos = avio_tell(pb);
1517 err = av_get_packet(pb, pkt, size);
1518 if (err < 0)
1519 return err;
1520 size = err;
1521
1522 if (ast->has_pal && pkt->size < (unsigned)INT_MAX / 2 && !dv_demux) {
1523 uint8_t *pal;
1524 pal = av_packet_new_side_data(pkt,
1525 AV_PKT_DATA_PALETTE,
1526 AVPALETTE_SIZE);
1527 if (!pal) {
1528 av_log(s, AV_LOG_ERROR,
1529 "Failed to allocate data for palette\n");
1530 } else {
1531 memcpy(pal, ast->pal, AVPALETTE_SIZE);
1532 ast->has_pal = 0;
1533 }
1534 }
1535
1536 if (CONFIG_DV_DEMUXER && dv_demux) {
1537 size = avpriv_dv_produce_packet(avi->dv_demux, pkt,
1538 pkt->data, pkt->size, pkt->pos);
1539 pkt->flags |= AV_PKT_FLAG_KEY;
1540 if (size < 0)
1541 av_packet_unref(pkt);
1542 } else if (st->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE &&
1543 !st->codecpar->codec_tag && read_gab2_sub(s, st, pkt)) {
1544 ast->frame_offset++;
1545 avi->stream_index = -1;
1546 ast->remaining = 0;
1547 goto resync;
1548 } else {
1549 /* XXX: How to handle B-frames in AVI? */
1550 pkt->dts = ast->frame_offset;
1551 // pkt->dts += ast->start;
1552 if (ast->sample_size)
1553 pkt->dts /= ast->sample_size;
1554 pkt->stream_index = avi->stream_index;
1555
1556 if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && sti->index_entries) {
1557 AVIndexEntry *e;
1558 int index;
1559
1560 index = av_index_search_timestamp(st, ast->frame_offset, AVSEEK_FLAG_ANY);
1561 e = &sti->index_entries[index];
1562
1563 if (index >= 0 && e->timestamp == ast->frame_offset) {
1564 if (index == sti->nb_index_entries-1) {
1565 int key=1;
1566 uint32_t state=-1;
1567 if (st->codecpar->codec_id == AV_CODEC_ID_MPEG4) {
1568 const uint8_t *ptr = pkt->data, *end = ptr + FFMIN(size, 256);
1569 while (ptr < end) {
1570 ptr = avpriv_find_start_code(ptr, end, &state);
1571 if (state == 0x1B6 && ptr < end) {
1572 key = !(*ptr & 0xC0);
1573 break;
1574 }
1575 }
1576 }
1577 if (!key)
1578 e->flags &= ~AVINDEX_KEYFRAME;
1579 }
1580 if (e->flags & AVINDEX_KEYFRAME)
1581 pkt->flags |= AV_PKT_FLAG_KEY;
1582 }
1583 } else {
1584 pkt->flags |= AV_PKT_FLAG_KEY;
1585 }
1586 ast->frame_offset += get_duration(ast, pkt->size);
1587 }
1588 ast->remaining -= err;
1589 if (!ast->remaining) {
1590 avi->stream_index = -1;
1591 ast->packet_size = 0;
1592 }
1593
1594 if (!avi->non_interleaved && pkt->pos >= 0 && ast->seek_pos > pkt->pos) {
1595 av_packet_unref(pkt);
1596 goto resync;
1597 }
1598 ast->seek_pos= 0;
1599
1600 if (!avi->non_interleaved && sti->nb_index_entries > 1 && avi->index_loaded > 1) {
1601 int64_t dts= av_rescale_q(pkt->dts, st->time_base, AV_TIME_BASE_Q);
1602
1603 if (avi->dts_max < dts) {
1604 avi->dts_max = dts;
1605 } else if (avi->dts_max - (uint64_t)dts > 2*AV_TIME_BASE) {
1606 avi->non_interleaved= 1;
1607 av_log(s, AV_LOG_INFO, "Switching to NI mode, due to poor interleaving\n");
1608 }
1609 }
1610
1611 return 0;
1612 }
1613
1614 if ((err = avi_sync(s, 0)) < 0)
1615 return err;
1616 goto resync;
1617 }
1618
1619 /* XXX: We make the implicit supposition that the positions are sorted
1620 * for each stream. */
1621 static int avi_read_idx1(AVFormatContext *s, int size)
1622 {
1623 AVIContext *avi = s->priv_data;
1624 AVIOContext *pb = s->pb;
1625 int nb_index_entries, i;
1626 AVStream *st;
1627 AVIStream *ast;
1628 int64_t pos;
1629 unsigned int index, tag, flags, len, first_packet = 1;
1630 int64_t last_pos = -1;
1631 unsigned last_idx = -1;
1632 int64_t idx1_pos, first_packet_pos = 0, data_offset = 0;
1633 int anykey = 0;
1634
1635 nb_index_entries = size / 16;
1636 if (nb_index_entries <= 0)
1637 return AVERROR_INVALIDDATA;
1638
1639 idx1_pos = avio_tell(pb);
1640 avio_seek(pb, avi->movi_list + 4, SEEK_SET);
1641 if (avi_sync(s, 1) == 0)
1642 first_packet_pos = avio_tell(pb) - 8;
1643 avi->stream_index = -1;
1644 avio_seek(pb, idx1_pos, SEEK_SET);
1645
1646 if (s->nb_streams == 1 && s->streams[0]->codecpar->codec_tag == AV_RL32("MMES")) {
1647 first_packet_pos = 0;
1648 data_offset = avi->movi_list;
1649 }
1650
1651 /* Read the entries and sort them in each stream component. */
1652 for (i = 0; i < nb_index_entries; i++) {
1653 if (avio_feof(pb))
1654 return -1;
1655
1656 tag = avio_rl32(pb);
1657 flags = avio_rl32(pb);
1658 pos = avio_rl32(pb);
1659 len = avio_rl32(pb);
1660 av_log(s, AV_LOG_TRACE, "%d: tag=0x%x flags=0x%x pos=0x%"PRIx64" len=%d/",
1661 i, tag, flags, pos, len);
1662
1663 index = ((tag & 0xff) - '0') * 10;
1664 index += (tag >> 8 & 0xff) - '0';
1665 if (index >= s->nb_streams)
1666 continue;
1667 st = s->streams[index];
1668 ast = st->priv_data;
1669
1670 /* Skip 'xxpc' palette change entries in the index until a logic
1671 * to process these is properly implemented. */
1672 if ((tag >> 16 & 0xff) == 'p' && (tag >> 24 & 0xff) == 'c')
1673 continue;
1674
1675 if (first_packet && first_packet_pos) {
1676 if (avi->movi_list + 4 != pos || pos + 500 > first_packet_pos)
1677 data_offset = first_packet_pos - pos;
1678 first_packet = 0;
1679 }
1680 pos += data_offset;
1681
1682 av_log(s, AV_LOG_TRACE, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
1683
1684 // even if we have only a single stream, we should
1685 // switch to non-interleaved to get correct timestamps
1686 if (last_pos == pos)
1687 avi->non_interleaved = 1;
1688 if (last_idx != pos && len) {
1689 av_add_index_entry(st, pos, ast->cum_len, len, 0,
1690 (flags & AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
1691 last_idx= pos;
1692 }
1693 ast->cum_len += get_duration(ast, len);
1694 last_pos = pos;
1695 anykey |= flags&AVIIF_INDEX;
1696 }
1697 if (!anykey) {
1698 for (index = 0; index < s->nb_streams; index++) {
1699 FFStream *const sti = ffstream(s->streams[index]);
1700 if (sti->nb_index_entries)
1701 sti->index_entries[0].flags |= AVINDEX_KEYFRAME;
1702 }
1703 }
1704 return 0;
1705 }
1706
1707 /* Scan the index and consider any file with streams more than
1708 * 2 seconds or 64MB apart non-interleaved. */
1709 static int check_stream_max_drift(AVFormatContext *s)
1710 {
1711 int64_t min_pos, pos;
1712 int i;
1713 int *idx = av_calloc(s->nb_streams, sizeof(*idx));
1714 if (!idx)
1715 return AVERROR(ENOMEM);
1716 for (min_pos = pos = 0; min_pos != INT64_MAX; pos = min_pos + 1ULL) {
1717 int64_t max_dts = INT64_MIN / 2;
1718 int64_t min_dts = INT64_MAX / 2;
1719 int64_t max_buffer = 0;
1720
1721 min_pos = INT64_MAX;
1722
1723 for (i = 0; i < s->nb_streams; i++) {
1724 AVStream *st = s->streams[i];
1725 AVIStream *ast = st->priv_data;
1726 FFStream *const sti = ffstream(st);
1727 int n = sti->nb_index_entries;
1728 while (idx[i] < n && sti->index_entries[idx[i]].pos < pos)
1729 idx[i]++;
1730 if (idx[i] < n) {
1731 int64_t dts;
1732 dts = av_rescale_q(sti->index_entries[idx[i]].timestamp /
1733 FFMAX(ast->sample_size, 1),
1734 st->time_base, AV_TIME_BASE_Q);
1735 min_dts = FFMIN(min_dts, dts);
1736 min_pos = FFMIN(min_pos, sti->index_entries[idx[i]].pos);
1737 }
1738 }
1739 for (i = 0; i < s->nb_streams; i++) {
1740 AVStream *st = s->streams[i];
1741 FFStream *const sti = ffstream(st);
1742 AVIStream *ast = st->priv_data;
1743
1744 if (idx[i] && min_dts != INT64_MAX / 2) {
1745 int64_t dts, delta_dts;
1746 dts = av_rescale_q(sti->index_entries[idx[i] - 1].timestamp /
1747 FFMAX(ast->sample_size, 1),
1748 st->time_base, AV_TIME_BASE_Q);
1749 delta_dts = av_sat_sub64(dts, min_dts);
1750 max_dts = FFMAX(max_dts, dts);
1751 max_buffer = FFMAX(max_buffer,
1752 av_rescale(delta_dts,
1753 st->codecpar->bit_rate,
1754 AV_TIME_BASE));
1755 }
1756 }
1757 if (av_sat_sub64(max_dts, min_dts) > 2 * AV_TIME_BASE ||
1758 max_buffer > 1024 * 1024 * 8 * 8) {
1759 av_free(idx);
1760 return 1;
1761 }
1762 }
1763 av_free(idx);
1764 return 0;
1765 }
1766
1767 static int guess_ni_flag(AVFormatContext *s)
1768 {
1769 int i;
1770 int64_t last_start = 0;
1771 int64_t first_end = INT64_MAX;
1772 int64_t oldpos = avio_tell(s->pb);
1773
1774 for (i = 0; i < s->nb_streams; i++) {
1775 AVStream *st = s->streams[i];
1776 FFStream *const sti = ffstream(st);
1777 int n = sti->nb_index_entries;
1778 unsigned int size;
1779
1780 if (n <= 0)
1781 continue;
1782
1783 if (n >= 2) {
1784 int64_t pos = sti->index_entries[0].pos;
1785 unsigned tag[2];
1786 avio_seek(s->pb, pos, SEEK_SET);
1787 tag[0] = avio_r8(s->pb);
1788 tag[1] = avio_r8(s->pb);
1789 avio_rl16(s->pb);
1790 size = avio_rl32(s->pb);
1791 if (get_stream_idx(tag) == i && pos + size > sti->index_entries[1].pos)
1792 last_start = INT64_MAX;
1793 if (get_stream_idx(tag) == i && size == sti->index_entries[0].size + 8)
1794 last_start = INT64_MAX;
1795 }
1796
1797 if (sti->index_entries[0].pos > last_start)
1798 last_start = sti->index_entries[0].pos;
1799 if (sti->index_entries[n - 1].pos < first_end)
1800 first_end = sti->index_entries[n - 1].pos;
1801 }
1802 avio_seek(s->pb, oldpos, SEEK_SET);
1803
1804 if (last_start > first_end)
1805 return 1;
1806
1807 return check_stream_max_drift(s);
1808 }
1809
1810 static int avi_load_index(AVFormatContext *s)
1811 {
1812 AVIContext *avi = s->priv_data;
1813 AVIOContext *pb = s->pb;
1814 uint32_t tag, size;
1815 int64_t pos = avio_tell(pb);
1816 int64_t next;
1817 int ret = -1;
1818
1819 if (avio_seek(pb, avi->movi_end, SEEK_SET) < 0)
1820 goto the_end; // maybe truncated file
1821 av_log(s, AV_LOG_TRACE, "movi_end=0x%"PRIx64"\n", avi->movi_end);
1822 for (;;) {
1823 tag = avio_rl32(pb);
1824 size = avio_rl32(pb);
1825 if (avio_feof(pb))
1826 break;
1827 next = avio_tell(pb);
1828 if (next < 0 || next > INT64_MAX - size - (size & 1))
1829 break;
1830 next += size + (size & 1LL);
1831
1832 if (tag == MKTAG('i', 'd', 'x', '1') &&
1833 avi_read_idx1(s, size) >= 0) {
1834 avi->index_loaded=2;
1835 ret = 0;
1836 }else if (tag == MKTAG('L', 'I', 'S', 'T')) {
1837 uint32_t tag1 = avio_rl32(pb);
1838
1839 if (tag1 == MKTAG('I', 'N', 'F', 'O'))
1840 ff_read_riff_info(s, size - 4);
1841 }else if (!ret)
1842 break;
1843
1844 if (avio_seek(pb, next, SEEK_SET) < 0)
1845 break; // something is wrong here
1846 }
1847
1848 the_end:
1849 avio_seek(pb, pos, SEEK_SET);
1850 return ret;
1851 }
1852
1853 static void seek_subtitle(AVStream *st, AVStream *st2, int64_t timestamp)
1854 {
1855 AVIStream *ast2 = st2->priv_data;
1856 int64_t ts2 = av_rescale_q(timestamp, st->time_base, st2->time_base);
1857 av_packet_unref(ast2->sub_pkt);
1858 if (avformat_seek_file(ast2->sub_ctx, 0, INT64_MIN, ts2, ts2, 0) >= 0 ||
1859 avformat_seek_file(ast2->sub_ctx, 0, ts2, ts2, INT64_MAX, 0) >= 0)
1860 ff_read_packet(ast2->sub_ctx, ast2->sub_pkt);
1861 }
1862
1863 static int avi_read_seek(AVFormatContext *s, int stream_index,
1864 int64_t timestamp, int flags)
1865 {
1866 AVIContext *avi = s->priv_data;
1867 AVStream *st;
1868 FFStream *sti;
1869 int i, index;
1870 int64_t pos, pos_min;
1871 AVIStream *ast;
1872
1873 /* Does not matter which stream is requested dv in avi has the
1874 * stream information in the first video stream.
1875 */
1876 if (avi->dv_demux)
1877 stream_index = 0;
1878
1879 if (!avi->index_loaded) {
1880 /* we only load the index on demand */
1881 avi_load_index(s);
1882 avi->index_loaded |= 1;
1883 }
1884 av_assert0(stream_index >= 0);
1885
1886 st = s->streams[stream_index];
1887 sti = ffstream(st);
1888 ast = st->priv_data;
1889
1890 if (avi->dv_demux) {
1891 // index entries are in the AVI scale/rate timebase, which does
1892 // not match DV demuxer's stream timebase
1893 timestamp = av_rescale_q(timestamp, st->time_base,
1894 (AVRational){ ast->scale, ast->rate });
1895 } else
1896 timestamp *= FFMAX(ast->sample_size, 1);
1897
1898 index = av_index_search_timestamp(st, timestamp, flags);
1899 if (index < 0) {
1900 if (sti->nb_index_entries > 0)
1901 av_log(s, AV_LOG_DEBUG, "Failed to find timestamp %"PRId64 " in index %"PRId64 " .. %"PRId64 "\n",
1902 timestamp,
1903 sti->index_entries[0].timestamp,
1904 sti->index_entries[sti->nb_index_entries - 1].timestamp);
1905 return AVERROR_INVALIDDATA;
1906 }
1907
1908 /* find the position */
1909 pos = sti->index_entries[index].pos;
1910 timestamp = sti->index_entries[index].timestamp;
1911
1912 av_log(s, AV_LOG_TRACE, "XX %"PRId64" %d %"PRId64"\n",
1913 timestamp, index, sti->index_entries[index].timestamp);
1914
1915 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1916 /* One and only one real stream for DV in AVI, and it has video */
1917 /* offsets. Calling with other stream indexes should have failed */
1918 /* the av_index_search_timestamp call above. */
1919
1920 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
1921 return -1;
1922
1923 /* Feed the DV video stream version of the timestamp to the */
1924 /* DV demux so it can synthesize correct timestamps. */
1925 ff_dv_ts_reset(avi->dv_demux,
1926 av_rescale_q(timestamp, (AVRational){ ast->scale, ast->rate },
1927 st->time_base));
1928
1929 avi->stream_index = -1;
1930 return 0;
1931 }
1932 timestamp /= FFMAX(ast->sample_size, 1);
1933
1934 pos_min = pos;
1935 for (i = 0; i < s->nb_streams; i++) {
1936 AVStream *st2 = s->streams[i];
1937 FFStream *const sti2 = ffstream(st2);
1938 AVIStream *ast2 = st2->priv_data;
1939
1940 ast2->packet_size =
1941 ast2->remaining = 0;
1942
1943 if (ast2->sub_ctx) {
1944 seek_subtitle(st, st2, timestamp);
1945 continue;
1946 }
1947
1948 if (sti2->nb_index_entries <= 0)
1949 continue;
1950
1951 // av_assert1(st2->codecpar->block_align);
1952 index = av_index_search_timestamp(st2,
1953 av_rescale_q(timestamp,
1954 st->time_base,
1955 st2->time_base) *
1956 FFMAX(ast2->sample_size, 1),
1957 flags |
1958 AVSEEK_FLAG_BACKWARD |
1959 (st2->codecpar->codec_type != AVMEDIA_TYPE_VIDEO ? AVSEEK_FLAG_ANY : 0));
1960 if (index < 0)
1961 index = 0;
1962 ast2->seek_pos = sti2->index_entries[index].pos;
1963 pos_min = FFMIN(pos_min,ast2->seek_pos);
1964 }
1965 for (i = 0; i < s->nb_streams; i++) {
1966 AVStream *st2 = s->streams[i];
1967 FFStream *const sti2 = ffstream(st2);
1968 AVIStream *ast2 = st2->priv_data;
1969
1970 if (ast2->sub_ctx || sti2->nb_index_entries <= 0)
1971 continue;
1972
1973 index = av_index_search_timestamp(
1974 st2,
1975 av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
1976 flags | AVSEEK_FLAG_BACKWARD | (st2->codecpar->codec_type != AVMEDIA_TYPE_VIDEO ? AVSEEK_FLAG_ANY : 0));
1977 if (index < 0)
1978 index = 0;
1979 while (!avi->non_interleaved && index > 0 && sti2->index_entries[index-1].pos >= pos_min)
1980 index--;
1981 ast2->frame_offset = sti2->index_entries[index].timestamp;
1982 }
1983
1984 /* do the seek */
1985 if (avio_seek(s->pb, pos_min, SEEK_SET) < 0) {
1986 av_log(s, AV_LOG_ERROR, "Seek failed\n");
1987 return -1;
1988 }
1989 avi->stream_index = -1;
1990 avi->dts_max = INT_MIN;
1991 return 0;
1992 }
1993
1994 static int avi_read_close(AVFormatContext *s)
1995 {
1996 int i;
1997 AVIContext *avi = s->priv_data;
1998
1999 for (i = 0; i < s->nb_streams; i++) {
2000 AVStream *st = s->streams[i];
2001 AVIStream *ast = st->priv_data;
2002 if (ast) {
2003 if (ast->sub_ctx) {
2004 av_freep(&ast->sub_ctx->pb);
2005 avformat_close_input(&ast->sub_ctx);
2006 }
2007 av_buffer_unref(&ast->sub_buffer);
2008 av_packet_free(&ast->sub_pkt);
2009 }
2010 }
2011
2012 av_freep(&avi->dv_demux);
2013
2014 return 0;
2015 }
2016
2017 static int avi_probe(const AVProbeData *p)
2018 {
2019 int i;
2020
2021 /* check file header */
2022 for (i = 0; avi_headers[i][0]; i++)
2023 if (AV_RL32(p->buf ) == AV_RL32(avi_headers[i] ) &&
2024 AV_RL32(p->buf + 8) == AV_RL32(avi_headers[i] + 4))
2025 return AVPROBE_SCORE_MAX;
2026
2027 return 0;
2028 }
2029
2030 const FFInputFormat ff_avi_demuxer = {
2031 .p.name = "avi",
2032 .p.long_name = NULL_IF_CONFIG_SMALL("AVI (Audio Video Interleaved)"),
2033 .p.extensions = "avi",
2034 .p.priv_class = &demuxer_class,
2035 .priv_data_size = sizeof(AVIContext),
2036 .flags_internal = FF_INFMT_FLAG_INIT_CLEANUP,
2037 .read_probe = avi_probe,
2038 .read_header = avi_read_header,
2039 .read_packet = avi_read_packet,
2040 .read_close = avi_read_close,
2041 .read_seek = avi_read_seek,
2042 };
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