3 * Copyright (c) 2001 Fabrice Bellard
5 * This file is part of FFmpeg.
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.
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.
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
24 #include "libavutil/avassert.h"
25 #include "libavutil/avstring.h"
26 #include "libavutil/bswap.h"
27 #include "libavutil/opt.h"
28 #include "libavutil/dict.h"
29 #include "libavutil/internal.h"
30 #include "libavutil/intreadwrite.h"
31 #include "libavutil/mathematics.h"
37 #include "libavcodec/bytestream.h"
38 #include "libavcodec/exif.h"
39 #include "libavformat/isom.h"
41 typedef struct AVIStream {
42 int64_t frame_offset; /* current frame (video) or byte (audio) counter
43 * (used to compute the pts) */
50 int sample_size; /* size of one sample (or packet)
51 * (in the rate/scale sense) in bytes */
53 int64_t cum_len; /* temporary storage (used during seek) */
54 int prefix; /* normally 'd'<<8 + 'c' or 'w'<<8 + 'b' */
58 int dshow_block_align; /* block align variable used to emulate bugs in
59 * the MS dshow demuxer */
61 AVFormatContext *sub_ctx;
68 typedef struct AVIContext {
80 DVDemuxContext *dv_demux;
83 #define MAX_ODML_DEPTH 1000
88 static const AVOption options[] = {
89 { "use_odml", "use odml index", offsetof(AVIContext, use_odml), AV_OPT_TYPE_INT, {.i64 = 1}, -1, 1, AV_OPT_FLAG_DECODING_PARAM},
93 static const AVClass demuxer_class = {
95 .item_name = av_default_item_name,
97 .version = LIBAVUTIL_VERSION_INT,
98 .category = AV_CLASS_CATEGORY_DEMUXER,
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', ' ' },
111 static const AVMetadataConv avi_metadata_conv[] = {
116 static int avi_load_index(AVFormatContext *s);
117 static int guess_ni_flag(AVFormatContext *s);
119 #define print_tag(str, tag, size) \
120 av_dlog(NULL, "pos:%"PRIX64" %s: tag=%c%c%c%c size=0x%x\n", \
121 avio_tell(pb), str, tag & 0xff, \
123 (tag >> 16) & 0xff, \
124 (tag >> 24) & 0xff, \
127 static inline int get_duration(AVIStream *ast, int len)
129 if (ast->sample_size)
131 else if (ast->dshow_block_align > 1)
132 return (len + ast->dshow_block_align - 1) / ast->dshow_block_align;
137 static int get_riff(AVFormatContext *s, AVIOContext *pb)
139 AVIContext *avi = s->priv_data;
140 char header[8] = {0};
143 /* check RIFF header */
144 avio_read(pb, header, 4);
145 avi->riff_end = avio_rl32(pb); /* RIFF chunk size */
146 avi->riff_end += avio_tell(pb); /* RIFF chunk end */
147 avio_read(pb, header + 4, 4);
149 for (i = 0; avi_headers[i][0]; i++)
150 if (!memcmp(header, avi_headers[i], 8))
152 if (!avi_headers[i][0])
153 return AVERROR_INVALIDDATA;
155 if (header[7] == 0x19)
156 av_log(s, AV_LOG_INFO,
157 "This file has been generated by a totally broken muxer.\n");
162 static int read_braindead_odml_indx(AVFormatContext *s, int frame_num)
164 AVIContext *avi = s->priv_data;
165 AVIOContext *pb = s->pb;
166 int longs_pre_entry = avio_rl16(pb);
167 int index_sub_type = avio_r8(pb);
168 int index_type = avio_r8(pb);
169 int entries_in_use = avio_rl32(pb);
170 int chunk_id = avio_rl32(pb);
171 int64_t base = avio_rl64(pb);
172 int stream_id = ((chunk_id & 0xFF) - '0') * 10 +
173 ((chunk_id >> 8 & 0xFF) - '0');
177 int64_t last_pos = -1;
178 int64_t filesize = avi->fsize;
181 "longs_pre_entry:%d index_type:%d entries_in_use:%d "
182 "chunk_id:%X base:%16"PRIX64"\n",
189 if (stream_id >= s->nb_streams || stream_id < 0)
190 return AVERROR_INVALIDDATA;
191 st = s->streams[stream_id];
195 return AVERROR_INVALIDDATA;
199 if (index_type && longs_pre_entry != 2)
200 return AVERROR_INVALIDDATA;
202 return AVERROR_INVALIDDATA;
204 if (filesize > 0 && base >= filesize) {
205 av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
206 if (base >> 32 == (base & 0xFFFFFFFF) &&
207 (base & 0xFFFFFFFF) < filesize &&
208 filesize <= 0xFFFFFFFF)
211 return AVERROR_INVALIDDATA;
214 for (i = 0; i < entries_in_use; i++) {
216 int64_t pos = avio_rl32(pb) + base - 8;
217 int len = avio_rl32(pb);
222 av_log(s, AV_LOG_ERROR, "pos:%"PRId64", len:%X\n", pos, len);
225 return AVERROR_INVALIDDATA;
227 if (last_pos == pos || pos == base - 8)
228 avi->non_interleaved = 1;
229 if (last_pos != pos && len)
230 av_add_index_entry(st, pos, ast->cum_len, len, 0,
231 key ? AVINDEX_KEYFRAME : 0);
233 ast->cum_len += get_duration(ast, len);
238 offset = avio_rl64(pb);
239 avio_rl32(pb); /* size */
240 duration = avio_rl32(pb);
243 return AVERROR_INVALIDDATA;
247 if (avi->odml_depth > MAX_ODML_DEPTH) {
248 av_log(s, AV_LOG_ERROR, "Too deeply nested ODML indexes\n");
249 return AVERROR_INVALIDDATA;
252 if (avio_seek(pb, offset + 8, SEEK_SET) < 0)
255 read_braindead_odml_indx(s, frame_num);
257 frame_num += duration;
259 if (avio_seek(pb, pos, SEEK_SET) < 0) {
260 av_log(s, AV_LOG_ERROR, "Failed to restore position after reading index\n");
266 avi->index_loaded = 2;
270 static void clean_index(AVFormatContext *s)
275 for (i = 0; i < s->nb_streams; i++) {
276 AVStream *st = s->streams[i];
277 AVIStream *ast = st->priv_data;
278 int n = st->nb_index_entries;
279 int max = ast->sample_size;
280 int64_t pos, size, ts;
282 if (n != 1 || ast->sample_size == 0)
288 pos = st->index_entries[0].pos;
289 size = st->index_entries[0].size;
290 ts = st->index_entries[0].timestamp;
292 for (j = 0; j < size; j += max)
293 av_add_index_entry(st, pos + j, ts + j, FFMIN(max, size - j), 0,
298 static int avi_read_tag(AVFormatContext *s, AVStream *st, uint32_t tag,
301 AVIOContext *pb = s->pb;
307 if (size == UINT_MAX)
308 return AVERROR(EINVAL);
309 value = av_malloc(size + 1);
311 return AVERROR(ENOMEM);
312 if (avio_read(pb, value, size) != size)
313 return AVERROR_INVALIDDATA;
318 return av_dict_set(st ? &st->metadata : &s->metadata, key, value,
319 AV_DICT_DONT_STRDUP_VAL);
322 static const char months[12][4] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
323 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
325 static void avi_metadata_creation_time(AVDictionary **metadata, char *date)
327 char month[4], time[9], buffer[64];
329 /* parse standard AVI date format (ie. "Mon Mar 10 15:04:43 2003") */
330 if (sscanf(date, "%*3s%*[ ]%3s%*[ ]%2d%*[ ]%8s%*[ ]%4d",
331 month, &day, time, &year) == 4) {
332 for (i = 0; i < 12; i++)
333 if (!av_strcasecmp(month, months[i])) {
334 snprintf(buffer, sizeof(buffer), "%.4d-%.2d-%.2d %s",
335 year, i + 1, day, time);
336 av_dict_set(metadata, "creation_time", buffer, 0);
338 } else if (date[4] == '/' && date[7] == '/') {
339 date[4] = date[7] = '-';
340 av_dict_set(metadata, "creation_time", date, 0);
344 static void avi_read_nikon(AVFormatContext *s, uint64_t end)
346 while (avio_tell(s->pb) < end) {
347 uint32_t tag = avio_rl32(s->pb);
348 uint32_t size = avio_rl32(s->pb);
350 case MKTAG('n', 'c', 't', 'g'): /* Nikon Tags */
352 uint64_t tag_end = avio_tell(s->pb) + size;
353 while (avio_tell(s->pb) < tag_end) {
354 uint16_t tag = avio_rl16(s->pb);
355 uint16_t size = avio_rl16(s->pb);
356 const char *name = NULL;
357 char buffer[64] = { 0 };
358 size = FFMIN(size, tag_end - avio_tell(s->pb));
359 size -= avio_read(s->pb, buffer,
360 FFMIN(size, sizeof(buffer) - 1));
369 name = "creation_time";
370 if (buffer[4] == ':' && buffer[7] == ':')
371 buffer[4] = buffer[7] = '-';
375 av_dict_set(&s->metadata, name, buffer, 0);
376 avio_skip(s->pb, size);
381 avio_skip(s->pb, size);
387 static int avi_extract_stream_metadata(AVStream *st)
390 uint8_t *data = st->codec->extradata;
391 int data_size = st->codec->extradata_size;
394 if (!data || data_size < 8) {
395 return AVERROR_INVALIDDATA;
398 bytestream2_init(&gb, data, data_size);
400 tag = bytestream2_get_le32(&gb);
403 case MKTAG('A', 'V', 'I', 'F'):
404 // skip 4 byte padding
405 bytestream2_skip(&gb, 4);
406 offset = bytestream2_tell(&gb);
407 bytestream2_init(&gb, data + offset, data_size - offset);
409 // decode EXIF tags from IFD, AVI is always little-endian
410 return avpriv_exif_decode_ifd(st->codec, &gb, 1, 0, &st->metadata);
412 case MKTAG('C', 'A', 'S', 'I'):
413 avpriv_request_sample(st->codec, "RIFF stream data tag type CASI (%u)", tag);
415 case MKTAG('Z', 'o', 'r', 'a'):
416 avpriv_request_sample(st->codec, "RIFF stream data tag type Zora (%u)", tag);
425 static int calculate_bitrate(AVFormatContext *s)
427 AVIContext *avi = s->priv_data;
432 for (i = 0; i<s->nb_streams; i++) {
434 AVStream *st = s->streams[i];
436 if (!st->nb_index_entries)
439 for (j = 0; j < st->nb_index_entries; j++)
440 len += st->index_entries[j].size;
441 maxpos = FFMAX(maxpos, st->index_entries[j-1].pos);
444 if (maxpos < avi->io_fsize*9/10) // index does not cover the whole file
446 if (lensum*9/10 > maxpos || lensum < maxpos*9/10) // frame sum and filesize mismatch
449 for (i = 0; i<s->nb_streams; i++) {
451 AVStream *st = s->streams[i];
454 for (j = 0; j < st->nb_index_entries; j++)
455 len += st->index_entries[j].size;
457 if (st->nb_index_entries < 2 || st->codec->bit_rate > 0)
459 duration = st->index_entries[j-1].timestamp - st->index_entries[0].timestamp;
460 st->codec->bit_rate = av_rescale(8*len, st->time_base.den, duration * st->time_base.num);
465 static int avi_read_header(AVFormatContext *s)
467 AVIContext *avi = s->priv_data;
468 AVIOContext *pb = s->pb;
469 unsigned int tag, tag1, handler;
470 int codec_type, stream_index, frame_period;
474 AVIStream *ast = NULL;
475 int avih_width = 0, avih_height = 0;
476 int amv_file_format = 0;
477 uint64_t list_end = 0;
479 AVDictionaryEntry *dict_entry;
481 avi->stream_index = -1;
483 ret = get_riff(s, pb);
487 av_log(avi, AV_LOG_DEBUG, "use odml:%d\n", avi->use_odml);
489 avi->io_fsize = avi->fsize = avio_size(pb);
490 if (avi->fsize <= 0 || avi->fsize < avi->riff_end)
491 avi->fsize = avi->riff_end == 8 ? INT64_MAX : avi->riff_end;
501 size = avio_rl32(pb);
503 print_tag("tag", tag, size);
506 case MKTAG('L', 'I', 'S', 'T'):
507 list_end = avio_tell(pb) + size;
508 /* Ignored, except at start of video packets. */
509 tag1 = avio_rl32(pb);
511 print_tag("list", tag1, 0);
513 if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
514 avi->movi_list = avio_tell(pb) - 4;
516 avi->movi_end = avi->movi_list + size + (size & 1);
518 avi->movi_end = avi->fsize;
519 av_dlog(NULL, "movi end=%"PRIx64"\n", avi->movi_end);
521 } else if (tag1 == MKTAG('I', 'N', 'F', 'O'))
522 ff_read_riff_info(s, size - 4);
523 else if (tag1 == MKTAG('n', 'c', 'd', 't'))
524 avi_read_nikon(s, list_end);
527 case MKTAG('I', 'D', 'I', 'T'):
529 unsigned char date[64] = { 0 };
531 size -= avio_read(pb, date, FFMIN(size, sizeof(date) - 1));
533 avi_metadata_creation_time(&s->metadata, date);
536 case MKTAG('d', 'm', 'l', 'h'):
538 avio_skip(pb, size + (size & 1));
540 case MKTAG('a', 'm', 'v', 'h'):
542 case MKTAG('a', 'v', 'i', 'h'):
544 /* using frame_period is bad idea */
545 frame_period = avio_rl32(pb);
546 avio_rl32(pb); /* max. bytes per second */
548 avi->non_interleaved |= avio_rl32(pb) & AVIF_MUSTUSEINDEX;
550 avio_skip(pb, 2 * 4);
553 avih_width = avio_rl32(pb);
554 avih_height = avio_rl32(pb);
556 avio_skip(pb, size - 10 * 4);
558 case MKTAG('s', 't', 'r', 'h'):
561 tag1 = avio_rl32(pb);
562 handler = avio_rl32(pb); /* codec tag */
564 if (tag1 == MKTAG('p', 'a', 'd', 's')) {
565 avio_skip(pb, size - 8);
569 st = avformat_new_stream(s, NULL);
573 st->id = stream_index;
574 ast = av_mallocz(sizeof(AVIStream));
580 tag1 = stream_index ? MKTAG('a', 'u', 'd', 's')
581 : MKTAG('v', 'i', 'd', 's');
583 print_tag("strh", tag1, -1);
585 if (tag1 == MKTAG('i', 'a', 'v', 's') ||
586 tag1 == MKTAG('i', 'v', 'a', 's')) {
589 /* After some consideration -- I don't think we
590 * have to support anything but DV in type1 AVIs. */
591 if (s->nb_streams != 1)
594 if (handler != MKTAG('d', 'v', 's', 'd') &&
595 handler != MKTAG('d', 'v', 'h', 'd') &&
596 handler != MKTAG('d', 'v', 's', 'l'))
599 ast = s->streams[0]->priv_data;
600 av_freep(&s->streams[0]->codec->extradata);
601 av_freep(&s->streams[0]->codec);
602 if (s->streams[0]->info)
603 av_freep(&s->streams[0]->info->duration_error);
604 av_freep(&s->streams[0]->info);
605 av_freep(&s->streams[0]);
607 if (CONFIG_DV_DEMUXER) {
608 avi->dv_demux = avpriv_dv_init_demux(s);
613 s->streams[0]->priv_data = ast;
614 avio_skip(pb, 3 * 4);
615 ast->scale = avio_rl32(pb);
616 ast->rate = avio_rl32(pb);
617 avio_skip(pb, 4); /* start time */
619 dv_dur = avio_rl32(pb);
620 if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
621 dv_dur *= AV_TIME_BASE;
622 s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
624 /* else, leave duration alone; timing estimation in utils.c
625 * will make a guess based on bitrate. */
627 stream_index = s->nb_streams - 1;
628 avio_skip(pb, size - 9 * 4);
632 av_assert0(stream_index < s->nb_streams);
633 ast->handler = handler;
635 avio_rl32(pb); /* flags */
636 avio_rl16(pb); /* priority */
637 avio_rl16(pb); /* language */
638 avio_rl32(pb); /* initial frame */
639 ast->scale = avio_rl32(pb);
640 ast->rate = avio_rl32(pb);
641 if (!(ast->scale && ast->rate)) {
642 av_log(s, AV_LOG_WARNING,
643 "scale/rate is %"PRIu32"/%"PRIu32" which is invalid. "
644 "(This file has been generated by broken software.)\n",
649 ast->scale = frame_period;
655 avpriv_set_pts_info(st, 64, ast->scale, ast->rate);
657 ast->cum_len = avio_rl32(pb); /* start */
658 st->nb_frames = avio_rl32(pb);
661 avio_rl32(pb); /* buffer size */
662 avio_rl32(pb); /* quality */
663 if (ast->cum_len*ast->scale/ast->rate > 3600) {
664 av_log(s, AV_LOG_ERROR, "crazy start time, iam scared, giving up\n");
667 ast->sample_size = avio_rl32(pb); /* sample ssize */
668 ast->cum_len *= FFMAX(1, ast->sample_size);
669 av_dlog(s, "%"PRIu32" %"PRIu32" %d\n",
670 ast->rate, ast->scale, ast->sample_size);
673 case MKTAG('v', 'i', 'd', 's'):
674 codec_type = AVMEDIA_TYPE_VIDEO;
676 ast->sample_size = 0;
677 st->avg_frame_rate = av_inv_q(st->time_base);
679 case MKTAG('a', 'u', 'd', 's'):
680 codec_type = AVMEDIA_TYPE_AUDIO;
682 case MKTAG('t', 'x', 't', 's'):
683 codec_type = AVMEDIA_TYPE_SUBTITLE;
685 case MKTAG('d', 'a', 't', 's'):
686 codec_type = AVMEDIA_TYPE_DATA;
689 av_log(s, AV_LOG_INFO, "unknown stream type %X\n", tag1);
691 if (ast->sample_size == 0) {
692 st->duration = st->nb_frames;
693 if (st->duration > 0 && avi->io_fsize > 0 && avi->riff_end > avi->io_fsize) {
694 av_log(s, AV_LOG_DEBUG, "File is truncated adjusting duration\n");
695 st->duration = av_rescale(st->duration, avi->io_fsize, avi->riff_end);
698 ast->frame_offset = ast->cum_len;
699 avio_skip(pb, size - 12 * 4);
701 case MKTAG('s', 't', 'r', 'f'):
705 if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
708 uint64_t cur_pos = avio_tell(pb);
710 if (cur_pos < list_end)
711 size = FFMIN(size, list_end - cur_pos);
712 st = s->streams[stream_index];
713 if (st->codec->codec_type != AVMEDIA_TYPE_UNKNOWN) {
717 switch (codec_type) {
718 case AVMEDIA_TYPE_VIDEO:
719 if (amv_file_format) {
720 st->codec->width = avih_width;
721 st->codec->height = avih_height;
722 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
723 st->codec->codec_id = AV_CODEC_ID_AMV;
727 tag1 = ff_get_bmp_header(pb, st, &esize);
729 if (tag1 == MKTAG('D', 'X', 'S', 'B') ||
730 tag1 == MKTAG('D', 'X', 'S', 'A')) {
731 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
732 st->codec->codec_tag = tag1;
733 st->codec->codec_id = AV_CODEC_ID_XSUB;
737 if (size > 10 * 4 && size < (1 << 30) && size < avi->fsize) {
738 if (esize == size-1 && (esize&1)) {
739 st->codec->extradata_size = esize - 10 * 4;
741 st->codec->extradata_size = size - 10 * 4;
742 if (ff_get_extradata(st->codec, pb, st->codec->extradata_size) < 0)
743 return AVERROR(ENOMEM);
746 // FIXME: check if the encoder really did this correctly
747 if (st->codec->extradata_size & 1)
750 /* Extract palette from extradata if bpp <= 8.
751 * This code assumes that extradata contains only palette.
752 * This is true for all paletted codecs implemented in
754 if (st->codec->extradata_size &&
755 (st->codec->bits_per_coded_sample <= 8)) {
756 int pal_size = (1 << st->codec->bits_per_coded_sample) << 2;
757 const uint8_t *pal_src;
759 pal_size = FFMIN(pal_size, st->codec->extradata_size);
760 pal_src = st->codec->extradata +
761 st->codec->extradata_size - pal_size;
762 /* Exclude the "BottomUp" field from the palette */
763 if (pal_src - st->codec->extradata >= 9 &&
764 !memcmp(st->codec->extradata + st->codec->extradata_size - 9, "BottomUp", 9))
766 for (i = 0; i < pal_size / 4; i++)
767 ast->pal[i] = 0xFFU<<24 | AV_RL32(pal_src+4*i);
771 print_tag("video", tag1, 0);
773 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
774 st->codec->codec_tag = tag1;
775 st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags,
777 if (!st->codec->codec_id) {
778 st->codec->codec_id = ff_codec_get_id(ff_codec_movvideo_tags,
780 if (st->codec->codec_id)
781 av_log(s, AV_LOG_WARNING, "mov tag found in avi\n");
783 /* This is needed to get the pict type which is necessary
784 * for generating correct pts. */
785 st->need_parsing = AVSTREAM_PARSE_HEADERS;
787 if (st->codec->codec_id == AV_CODEC_ID_MPEG4 &&
788 ast->handler == MKTAG('X', 'V', 'I', 'D'))
789 st->codec->codec_tag = MKTAG('X', 'V', 'I', 'D');
791 if (st->codec->codec_tag == MKTAG('V', 'S', 'S', 'H'))
792 st->need_parsing = AVSTREAM_PARSE_FULL;
794 if (st->codec->codec_tag == 0 && st->codec->height > 0 &&
795 st->codec->extradata_size < 1U << 30) {
796 st->codec->extradata_size += 9;
797 if ((ret = av_reallocp(&st->codec->extradata,
798 st->codec->extradata_size +
799 FF_INPUT_BUFFER_PADDING_SIZE)) < 0) {
800 st->codec->extradata_size = 0;
803 memcpy(st->codec->extradata + st->codec->extradata_size - 9,
806 st->codec->height = FFABS(st->codec->height);
808 // avio_skip(pb, size - 5 * 4);
810 case AVMEDIA_TYPE_AUDIO:
811 ret = ff_get_wav_header(pb, st->codec, size, 0);
814 ast->dshow_block_align = st->codec->block_align;
815 if (ast->sample_size && st->codec->block_align &&
816 ast->sample_size != st->codec->block_align) {
819 "sample size (%d) != block align (%d)\n",
821 st->codec->block_align);
822 ast->sample_size = st->codec->block_align;
825 * (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
828 /* Force parsing as several audio frames can be in
829 * one packet and timestamps refer to packet start. */
830 st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
831 /* ADTS header is in extradata, AAC without header must be
832 * stored as exact frames. Parser not needed and it will
834 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
835 st->codec->extradata_size)
836 st->need_parsing = AVSTREAM_PARSE_NONE;
837 /* AVI files with Xan DPCM audio (wrongly) declare PCM
838 * audio in the header but have Axan as stream_code_tag. */
839 if (ast->handler == AV_RL32("Axan")) {
840 st->codec->codec_id = AV_CODEC_ID_XAN_DPCM;
841 st->codec->codec_tag = 0;
842 ast->dshow_block_align = 0;
844 if (amv_file_format) {
845 st->codec->codec_id = AV_CODEC_ID_ADPCM_IMA_AMV;
846 ast->dshow_block_align = 0;
848 if (st->codec->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align <= 4 && ast->dshow_block_align) {
849 av_log(s, AV_LOG_DEBUG, "overriding invalid dshow_block_align of %d\n", ast->dshow_block_align);
850 ast->dshow_block_align = 0;
852 if (st->codec->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align == 1024 && ast->sample_size == 1024 ||
853 st->codec->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align == 4096 && ast->sample_size == 4096 ||
854 st->codec->codec_id == AV_CODEC_ID_MP3 && ast->dshow_block_align == 1152 && ast->sample_size == 1152) {
855 av_log(s, AV_LOG_DEBUG, "overriding sample_size\n");
856 ast->sample_size = 0;
859 case AVMEDIA_TYPE_SUBTITLE:
860 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
861 st->request_probe= 1;
865 st->codec->codec_type = AVMEDIA_TYPE_DATA;
866 st->codec->codec_id = AV_CODEC_ID_NONE;
867 st->codec->codec_tag = 0;
873 case MKTAG('s', 't', 'r', 'd'):
874 if (stream_index >= (unsigned)s->nb_streams
875 || s->streams[stream_index]->codec->extradata_size
876 || s->streams[stream_index]->codec->codec_tag == MKTAG('H','2','6','4')) {
879 uint64_t cur_pos = avio_tell(pb);
880 if (cur_pos < list_end)
881 size = FFMIN(size, list_end - cur_pos);
882 st = s->streams[stream_index];
885 if (ff_get_extradata(st->codec, pb, size) < 0)
886 return AVERROR(ENOMEM);
889 if (st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
892 ret = avi_extract_stream_metadata(st);
894 av_log(s, AV_LOG_WARNING, "could not decoding EXIF data in stream header.\n");
898 case MKTAG('i', 'n', 'd', 'x'):
900 if (pb->seekable && !(s->flags & AVFMT_FLAG_IGNIDX) &&
902 read_braindead_odml_indx(s, 0) < 0 &&
903 (s->error_recognition & AV_EF_EXPLODE))
905 avio_seek(pb, i + size, SEEK_SET);
907 case MKTAG('v', 'p', 'r', 'p'):
908 if (stream_index < (unsigned)s->nb_streams && size > 9 * 4) {
909 AVRational active, active_aspect;
911 st = s->streams[stream_index];
918 active_aspect.den = avio_rl16(pb);
919 active_aspect.num = avio_rl16(pb);
920 active.num = avio_rl32(pb);
921 active.den = avio_rl32(pb);
922 avio_rl32(pb); // nbFieldsPerFrame
924 if (active_aspect.num && active_aspect.den &&
925 active.num && active.den) {
926 st->sample_aspect_ratio = av_div_q(active_aspect, active);
927 av_dlog(s, "vprp %d/%d %d/%d\n",
928 active_aspect.num, active_aspect.den,
929 active.num, active.den);
935 case MKTAG('s', 't', 'r', 'n'):
937 ret = avi_read_tag(s, s->streams[s->nb_streams - 1], tag, size);
943 if (size > 1000000) {
944 av_log(s, AV_LOG_ERROR,
945 "Something went wrong during header parsing, "
946 "I will ignore it and try to continue anyway.\n");
947 if (s->error_recognition & AV_EF_EXPLODE)
949 avi->movi_list = avio_tell(pb) - 4;
950 avi->movi_end = avi->fsize;
961 /* check stream number */
962 if (stream_index != s->nb_streams - 1) {
965 return AVERROR_INVALIDDATA;
968 if (!avi->index_loaded && pb->seekable)
970 calculate_bitrate(s);
971 avi->index_loaded |= 1;
973 if ((ret = guess_ni_flag(s)) < 0)
976 avi->non_interleaved |= ret | (s->flags & AVFMT_FLAG_SORT_DTS);
978 dict_entry = av_dict_get(s->metadata, "ISFT", NULL, 0);
979 if (dict_entry && !strcmp(dict_entry->value, "PotEncoder"))
980 for (i = 0; i < s->nb_streams; i++) {
981 AVStream *st = s->streams[i];
982 if ( st->codec->codec_id == AV_CODEC_ID_MPEG1VIDEO
983 || st->codec->codec_id == AV_CODEC_ID_MPEG2VIDEO)
984 st->need_parsing = AVSTREAM_PARSE_FULL;
987 for (i = 0; i < s->nb_streams; i++) {
988 AVStream *st = s->streams[i];
989 if (st->nb_index_entries)
992 // DV-in-AVI cannot be non-interleaved, if set this must be
995 avi->non_interleaved = 0;
996 if (i == s->nb_streams && avi->non_interleaved) {
997 av_log(s, AV_LOG_WARNING,
998 "Non-interleaved AVI without index, switching to interleaved\n");
999 avi->non_interleaved = 0;
1002 if (avi->non_interleaved) {
1003 av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
1007 ff_metadata_conv_ctx(s, NULL, avi_metadata_conv);
1008 ff_metadata_conv_ctx(s, NULL, ff_riff_info_conv);
1013 static int read_gab2_sub(AVFormatContext *s, AVStream *st, AVPacket *pkt)
1015 if (pkt->size >= 7 &&
1016 pkt->size < INT_MAX - AVPROBE_PADDING_SIZE &&
1017 !strcmp(pkt->data, "GAB2") && AV_RL16(pkt->data + 5) == 2) {
1019 int score = AVPROBE_SCORE_EXTENSION, ret;
1020 AVIStream *ast = st->priv_data;
1021 AVInputFormat *sub_demuxer;
1022 AVRational time_base;
1024 AVIOContext *pb = avio_alloc_context(pkt->data + 7,
1026 0, NULL, NULL, NULL, NULL);
1028 unsigned int desc_len = avio_rl32(pb);
1030 if (desc_len > pb->buf_end - pb->buf_ptr)
1033 ret = avio_get_str16le(pb, desc_len, desc, sizeof(desc));
1034 avio_skip(pb, desc_len - ret);
1036 av_dict_set(&st->metadata, "title", desc, 0);
1038 avio_rl16(pb); /* flags? */
1039 avio_rl32(pb); /* data size */
1041 size = pb->buf_end - pb->buf_ptr;
1042 pd = (AVProbeData) { .buf = av_mallocz(size + AVPROBE_PADDING_SIZE),
1046 memcpy(pd.buf, pb->buf_ptr, size);
1047 sub_demuxer = av_probe_input_format2(&pd, 1, &score);
1052 if (!(ast->sub_ctx = avformat_alloc_context()))
1055 ast->sub_ctx->pb = pb;
1057 if (ff_copy_whitelists(ast->sub_ctx, s) < 0)
1060 if (!avformat_open_input(&ast->sub_ctx, "", sub_demuxer, NULL)) {
1061 ff_read_packet(ast->sub_ctx, &ast->sub_pkt);
1062 *st->codec = *ast->sub_ctx->streams[0]->codec;
1063 ast->sub_ctx->streams[0]->codec->extradata = NULL;
1064 time_base = ast->sub_ctx->streams[0]->time_base;
1065 avpriv_set_pts_info(st, 64, time_base.num, time_base.den);
1067 ast->sub_buffer = pkt->data;
1068 memset(pkt, 0, sizeof(*pkt));
1072 av_freep(&ast->sub_ctx);
1078 static AVStream *get_subtitle_pkt(AVFormatContext *s, AVStream *next_st,
1081 AVIStream *ast, *next_ast = next_st->priv_data;
1082 int64_t ts, next_ts, ts_min = INT64_MAX;
1083 AVStream *st, *sub_st = NULL;
1086 next_ts = av_rescale_q(next_ast->frame_offset, next_st->time_base,
1089 for (i = 0; i < s->nb_streams; i++) {
1091 ast = st->priv_data;
1092 if (st->discard < AVDISCARD_ALL && ast && ast->sub_pkt.data) {
1093 ts = av_rescale_q(ast->sub_pkt.dts, st->time_base, AV_TIME_BASE_Q);
1094 if (ts <= next_ts && ts < ts_min) {
1102 ast = sub_st->priv_data;
1103 *pkt = ast->sub_pkt;
1104 pkt->stream_index = sub_st->index;
1106 if (ff_read_packet(ast->sub_ctx, &ast->sub_pkt) < 0)
1107 ast->sub_pkt.data = NULL;
1112 static int get_stream_idx(const unsigned *d)
1114 if (d[0] >= '0' && d[0] <= '9' &&
1115 d[1] >= '0' && d[1] <= '9') {
1116 return (d[0] - '0') * 10 + (d[1] - '0');
1118 return 100; // invalid stream ID
1124 * @param exit_early set to 1 to just gather packet position without making the changes needed to actually read & return the packet
1126 static int avi_sync(AVFormatContext *s, int exit_early)
1128 AVIContext *avi = s->priv_data;
1129 AVIOContext *pb = s->pb;
1136 memset(d, -1, sizeof(d));
1137 for (i = sync = avio_tell(pb); !avio_feof(pb); i++) {
1140 for (j = 0; j < 7; j++)
1144 size = d[4] + (d[5] << 8) + (d[6] << 16) + (d[7] << 24);
1146 n = get_stream_idx(d + 2);
1147 av_dlog(s, "%X %X %X %X %X %X %X %X %"PRId64" %u %d\n",
1148 d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], i, size, n);
1149 if (i*(avi->io_fsize>0) + (uint64_t)size > avi->fsize || d[0] > 127)
1153 if ((d[0] == 'i' && d[1] == 'x' && n < s->nb_streams) ||
1155 (d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K') ||
1156 (d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')) {
1157 avio_skip(pb, size);
1162 if (d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T') {
1167 n = get_stream_idx(d);
1169 if (!((i - avi->last_pkt_pos) & 1) &&
1170 get_stream_idx(d + 1) < s->nb_streams)
1173 // detect ##ix chunk and skip
1174 if (d[2] == 'i' && d[3] == 'x' && n < s->nb_streams) {
1175 avio_skip(pb, size);
1179 if (avi->dv_demux && n != 0)
1183 if (n < s->nb_streams) {
1187 ast = st->priv_data;
1190 av_log(s, AV_LOG_WARNING, "Skipping foreign stream %d packet\n", n);
1194 if (s->nb_streams >= 2) {
1195 AVStream *st1 = s->streams[1];
1196 AVIStream *ast1 = st1->priv_data;
1197 // workaround for broken small-file-bug402.avi
1198 if ( d[2] == 'w' && d[3] == 'b'
1200 && st ->codec->codec_type == AVMEDIA_TYPE_VIDEO
1201 && st1->codec->codec_type == AVMEDIA_TYPE_AUDIO
1202 && ast->prefix == 'd'*256+'c'
1203 && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
1208 av_log(s, AV_LOG_WARNING,
1209 "Invalid stream + prefix combination, assuming audio.\n");
1213 if (!avi->dv_demux &&
1214 ((st->discard >= AVDISCARD_DEFAULT && size == 0) /* ||
1215 // FIXME: needs a little reordering
1216 (st->discard >= AVDISCARD_NONKEY &&
1217 !(pkt->flags & AV_PKT_FLAG_KEY)) */
1218 || st->discard >= AVDISCARD_ALL)) {
1220 ast->frame_offset += get_duration(ast, size);
1221 avio_skip(pb, size);
1226 if (d[2] == 'p' && d[3] == 'c' && size <= 4 * 256 + 4) {
1227 int k = avio_r8(pb);
1228 int last = (k + avio_r8(pb) - 1) & 0xFF;
1230 avio_rl16(pb); // flags
1232 // b + (g << 8) + (r << 16);
1233 for (; k <= last; k++)
1234 ast->pal[k] = 0xFFU<<24 | avio_rb32(pb)>>8;
1238 } else if (((ast->prefix_count < 5 || sync + 9 > i) &&
1239 d[2] < 128 && d[3] < 128) ||
1240 d[2] * 256 + d[3] == ast->prefix /* ||
1241 (d[2] == 'd' && d[3] == 'c') ||
1242 (d[2] == 'w' && d[3] == 'b') */) {
1245 if (d[2] * 256 + d[3] == ast->prefix)
1246 ast->prefix_count++;
1248 ast->prefix = d[2] * 256 + d[3];
1249 ast->prefix_count = 0;
1252 avi->stream_index = n;
1253 ast->packet_size = size + 8;
1254 ast->remaining = size;
1257 uint64_t pos = avio_tell(pb) - 8;
1258 if (!st->index_entries || !st->nb_index_entries ||
1259 st->index_entries[st->nb_index_entries - 1].pos < pos) {
1260 av_add_index_entry(st, pos, ast->frame_offset, size,
1261 0, AVINDEX_KEYFRAME);
1274 static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
1276 AVIContext *avi = s->priv_data;
1277 AVIOContext *pb = s->pb;
1279 #if FF_API_DESTRUCT_PACKET
1283 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1284 int size = avpriv_dv_get_packet(avi->dv_demux, pkt);
1291 if (avi->non_interleaved) {
1292 int best_stream_index = 0;
1293 AVStream *best_st = NULL;
1294 AVIStream *best_ast;
1295 int64_t best_ts = INT64_MAX;
1298 for (i = 0; i < s->nb_streams; i++) {
1299 AVStream *st = s->streams[i];
1300 AVIStream *ast = st->priv_data;
1301 int64_t ts = ast->frame_offset;
1304 if (!st->nb_index_entries)
1307 last_ts = st->index_entries[st->nb_index_entries - 1].timestamp;
1308 if (!ast->remaining && ts > last_ts)
1311 ts = av_rescale_q(ts, st->time_base,
1312 (AVRational) { FFMAX(1, ast->sample_size),
1315 av_dlog(s, "%"PRId64" %d/%d %"PRId64"\n", ts,
1316 st->time_base.num, st->time_base.den, ast->frame_offset);
1320 best_stream_index = i;
1326 best_ast = best_st->priv_data;
1327 best_ts = best_ast->frame_offset;
1328 if (best_ast->remaining) {
1329 i = av_index_search_timestamp(best_st,
1332 AVSEEK_FLAG_BACKWARD);
1334 i = av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
1336 best_ast->frame_offset = best_st->index_entries[i].timestamp;
1340 int64_t pos = best_st->index_entries[i].pos;
1341 pos += best_ast->packet_size - best_ast->remaining;
1342 if (avio_seek(s->pb, pos + 8, SEEK_SET) < 0)
1345 av_assert0(best_ast->remaining <= best_ast->packet_size);
1347 avi->stream_index = best_stream_index;
1348 if (!best_ast->remaining)
1349 best_ast->packet_size =
1350 best_ast->remaining = best_st->index_entries[i].size;
1357 if (avi->stream_index >= 0) {
1358 AVStream *st = s->streams[avi->stream_index];
1359 AVIStream *ast = st->priv_data;
1362 if (get_subtitle_pkt(s, st, pkt))
1365 // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
1366 if (ast->sample_size <= 1)
1368 else if (ast->sample_size < 32)
1369 // arbitrary multiplier to avoid tiny packets for raw PCM data
1370 size = 1024 * ast->sample_size;
1372 size = ast->sample_size;
1374 if (size > ast->remaining)
1375 size = ast->remaining;
1376 avi->last_pkt_pos = avio_tell(pb);
1377 err = av_get_packet(pb, pkt, size);
1382 if (ast->has_pal && pkt->size < (unsigned)INT_MAX / 2) {
1384 pal = av_packet_new_side_data(pkt,
1385 AV_PKT_DATA_PALETTE,
1388 av_log(s, AV_LOG_ERROR,
1389 "Failed to allocate data for palette\n");
1391 memcpy(pal, ast->pal, AVPALETTE_SIZE);
1396 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1397 AVBufferRef *avbuf = pkt->buf;
1398 #if FF_API_DESTRUCT_PACKET
1399 FF_DISABLE_DEPRECATION_WARNINGS
1400 dstr = pkt->destruct;
1401 FF_ENABLE_DEPRECATION_WARNINGS
1403 size = avpriv_dv_produce_packet(avi->dv_demux, pkt,
1404 pkt->data, pkt->size, pkt->pos);
1405 #if FF_API_DESTRUCT_PACKET
1406 FF_DISABLE_DEPRECATION_WARNINGS
1407 pkt->destruct = dstr;
1408 FF_ENABLE_DEPRECATION_WARNINGS
1411 pkt->flags |= AV_PKT_FLAG_KEY;
1413 av_free_packet(pkt);
1414 } else if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE &&
1415 !st->codec->codec_tag && read_gab2_sub(s, st, pkt)) {
1416 ast->frame_offset++;
1417 avi->stream_index = -1;
1421 /* XXX: How to handle B-frames in AVI? */
1422 pkt->dts = ast->frame_offset;
1423 // pkt->dts += ast->start;
1424 if (ast->sample_size)
1425 pkt->dts /= ast->sample_size;
1427 "dts:%"PRId64" offset:%"PRId64" %d/%d smpl_siz:%d "
1428 "base:%d st:%d size:%d\n",
1437 pkt->stream_index = avi->stream_index;
1439 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && st->index_entries) {
1443 index = av_index_search_timestamp(st, ast->frame_offset, AVSEEK_FLAG_ANY);
1444 e = &st->index_entries[index];
1446 if (index >= 0 && e->timestamp == ast->frame_offset) {
1447 if (index == st->nb_index_entries-1) {
1451 for (i=0; i<FFMIN(size,256); i++) {
1452 if (st->codec->codec_id == AV_CODEC_ID_MPEG4) {
1453 if (state == 0x1B6) {
1454 key= !(pkt->data[i]&0xC0);
1459 state= (state<<8) + pkt->data[i];
1462 e->flags &= ~AVINDEX_KEYFRAME;
1464 if (e->flags & AVINDEX_KEYFRAME)
1465 pkt->flags |= AV_PKT_FLAG_KEY;
1468 pkt->flags |= AV_PKT_FLAG_KEY;
1470 ast->frame_offset += get_duration(ast, pkt->size);
1472 ast->remaining -= err;
1473 if (!ast->remaining) {
1474 avi->stream_index = -1;
1475 ast->packet_size = 0;
1478 if (!avi->non_interleaved && pkt->pos >= 0 && ast->seek_pos > pkt->pos) {
1479 av_free_packet(pkt);
1484 if (!avi->non_interleaved && st->nb_index_entries>1 && avi->index_loaded>1) {
1485 int64_t dts= av_rescale_q(pkt->dts, st->time_base, AV_TIME_BASE_Q);
1487 if (avi->dts_max - dts > 2*AV_TIME_BASE) {
1488 avi->non_interleaved= 1;
1489 av_log(s, AV_LOG_INFO, "Switching to NI mode, due to poor interleaving\n");
1490 }else if (avi->dts_max < dts)
1497 if ((err = avi_sync(s, 0)) < 0)
1502 /* XXX: We make the implicit supposition that the positions are sorted
1503 * for each stream. */
1504 static int avi_read_idx1(AVFormatContext *s, int size)
1506 AVIContext *avi = s->priv_data;
1507 AVIOContext *pb = s->pb;
1508 int nb_index_entries, i;
1511 unsigned int index, tag, flags, pos, len, first_packet = 1;
1512 unsigned last_pos = -1;
1513 unsigned last_idx = -1;
1514 int64_t idx1_pos, first_packet_pos = 0, data_offset = 0;
1517 nb_index_entries = size / 16;
1518 if (nb_index_entries <= 0)
1519 return AVERROR_INVALIDDATA;
1521 idx1_pos = avio_tell(pb);
1522 avio_seek(pb, avi->movi_list + 4, SEEK_SET);
1523 if (avi_sync(s, 1) == 0)
1524 first_packet_pos = avio_tell(pb) - 8;
1525 avi->stream_index = -1;
1526 avio_seek(pb, idx1_pos, SEEK_SET);
1528 if (s->nb_streams == 1 && s->streams[0]->codec->codec_tag == AV_RL32("MMES")) {
1529 first_packet_pos = 0;
1530 data_offset = avi->movi_list;
1533 /* Read the entries and sort them in each stream component. */
1534 for (i = 0; i < nb_index_entries; i++) {
1538 tag = avio_rl32(pb);
1539 flags = avio_rl32(pb);
1540 pos = avio_rl32(pb);
1541 len = avio_rl32(pb);
1542 av_dlog(s, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
1543 i, tag, flags, pos, len);
1545 index = ((tag & 0xff) - '0') * 10;
1546 index += (tag >> 8 & 0xff) - '0';
1547 if (index >= s->nb_streams)
1549 st = s->streams[index];
1550 ast = st->priv_data;
1552 if (first_packet && first_packet_pos) {
1553 data_offset = first_packet_pos - pos;
1558 av_dlog(s, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
1560 // even if we have only a single stream, we should
1561 // switch to non-interleaved to get correct timestamps
1562 if (last_pos == pos)
1563 avi->non_interleaved = 1;
1564 if (last_idx != pos && len) {
1565 av_add_index_entry(st, pos, ast->cum_len, len, 0,
1566 (flags & AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
1569 ast->cum_len += get_duration(ast, len);
1571 anykey |= flags&AVIIF_INDEX;
1574 for (index = 0; index < s->nb_streams; index++) {
1575 st = s->streams[index];
1576 if (st->nb_index_entries)
1577 st->index_entries[0].flags |= AVINDEX_KEYFRAME;
1583 /* Scan the index and consider any file with streams more than
1584 * 2 seconds or 64MB apart non-interleaved. */
1585 static int check_stream_max_drift(AVFormatContext *s)
1587 int64_t min_pos, pos;
1589 int *idx = av_mallocz_array(s->nb_streams, sizeof(*idx));
1591 return AVERROR(ENOMEM);
1592 for (min_pos = pos = 0; min_pos != INT64_MAX; pos = min_pos + 1LU) {
1593 int64_t max_dts = INT64_MIN / 2;
1594 int64_t min_dts = INT64_MAX / 2;
1595 int64_t max_buffer = 0;
1597 min_pos = INT64_MAX;
1599 for (i = 0; i < s->nb_streams; i++) {
1600 AVStream *st = s->streams[i];
1601 AVIStream *ast = st->priv_data;
1602 int n = st->nb_index_entries;
1603 while (idx[i] < n && st->index_entries[idx[i]].pos < pos)
1607 dts = av_rescale_q(st->index_entries[idx[i]].timestamp /
1608 FFMAX(ast->sample_size, 1),
1609 st->time_base, AV_TIME_BASE_Q);
1610 min_dts = FFMIN(min_dts, dts);
1611 min_pos = FFMIN(min_pos, st->index_entries[idx[i]].pos);
1614 for (i = 0; i < s->nb_streams; i++) {
1615 AVStream *st = s->streams[i];
1616 AVIStream *ast = st->priv_data;
1618 if (idx[i] && min_dts != INT64_MAX / 2) {
1620 dts = av_rescale_q(st->index_entries[idx[i] - 1].timestamp /
1621 FFMAX(ast->sample_size, 1),
1622 st->time_base, AV_TIME_BASE_Q);
1623 max_dts = FFMAX(max_dts, dts);
1624 max_buffer = FFMAX(max_buffer,
1625 av_rescale(dts - min_dts,
1626 st->codec->bit_rate,
1630 if (max_dts - min_dts > 2 * AV_TIME_BASE ||
1631 max_buffer > 1024 * 1024 * 8 * 8) {
1640 static int guess_ni_flag(AVFormatContext *s)
1643 int64_t last_start = 0;
1644 int64_t first_end = INT64_MAX;
1645 int64_t oldpos = avio_tell(s->pb);
1647 for (i = 0; i < s->nb_streams; i++) {
1648 AVStream *st = s->streams[i];
1649 int n = st->nb_index_entries;
1656 int64_t pos = st->index_entries[0].pos;
1657 avio_seek(s->pb, pos + 4, SEEK_SET);
1658 size = avio_rl32(s->pb);
1659 if (pos + size > st->index_entries[1].pos)
1660 last_start = INT64_MAX;
1663 if (st->index_entries[0].pos > last_start)
1664 last_start = st->index_entries[0].pos;
1665 if (st->index_entries[n - 1].pos < first_end)
1666 first_end = st->index_entries[n - 1].pos;
1668 avio_seek(s->pb, oldpos, SEEK_SET);
1670 if (last_start > first_end)
1673 return check_stream_max_drift(s);
1676 static int avi_load_index(AVFormatContext *s)
1678 AVIContext *avi = s->priv_data;
1679 AVIOContext *pb = s->pb;
1681 int64_t pos = avio_tell(pb);
1685 if (avio_seek(pb, avi->movi_end, SEEK_SET) < 0)
1686 goto the_end; // maybe truncated file
1687 av_dlog(s, "movi_end=0x%"PRIx64"\n", avi->movi_end);
1689 tag = avio_rl32(pb);
1690 size = avio_rl32(pb);
1693 next = avio_tell(pb) + size + (size & 1);
1695 av_dlog(s, "tag=%c%c%c%c size=0x%x\n",
1702 if (tag == MKTAG('i', 'd', 'x', '1') &&
1703 avi_read_idx1(s, size) >= 0) {
1704 avi->index_loaded=2;
1706 }else if (tag == MKTAG('L', 'I', 'S', 'T')) {
1707 uint32_t tag1 = avio_rl32(pb);
1709 if (tag1 == MKTAG('I', 'N', 'F', 'O'))
1710 ff_read_riff_info(s, size - 4);
1714 if (avio_seek(pb, next, SEEK_SET) < 0)
1715 break; // something is wrong here
1719 avio_seek(pb, pos, SEEK_SET);
1723 static void seek_subtitle(AVStream *st, AVStream *st2, int64_t timestamp)
1725 AVIStream *ast2 = st2->priv_data;
1726 int64_t ts2 = av_rescale_q(timestamp, st->time_base, st2->time_base);
1727 av_free_packet(&ast2->sub_pkt);
1728 if (avformat_seek_file(ast2->sub_ctx, 0, INT64_MIN, ts2, ts2, 0) >= 0 ||
1729 avformat_seek_file(ast2->sub_ctx, 0, ts2, ts2, INT64_MAX, 0) >= 0)
1730 ff_read_packet(ast2->sub_ctx, &ast2->sub_pkt);
1733 static int avi_read_seek(AVFormatContext *s, int stream_index,
1734 int64_t timestamp, int flags)
1736 AVIContext *avi = s->priv_data;
1739 int64_t pos, pos_min;
1742 /* Does not matter which stream is requested dv in avi has the
1743 * stream information in the first video stream.
1748 if (!avi->index_loaded) {
1749 /* we only load the index on demand */
1751 avi->index_loaded |= 1;
1753 av_assert0(stream_index >= 0);
1755 st = s->streams[stream_index];
1756 ast = st->priv_data;
1757 index = av_index_search_timestamp(st,
1758 timestamp * FFMAX(ast->sample_size, 1),
1761 if (st->nb_index_entries > 0)
1762 av_log(s, AV_LOG_DEBUG, "Failed to find timestamp %"PRId64 " in index %"PRId64 " .. %"PRId64 "\n",
1763 timestamp * FFMAX(ast->sample_size, 1),
1764 st->index_entries[0].timestamp,
1765 st->index_entries[st->nb_index_entries - 1].timestamp);
1766 return AVERROR_INVALIDDATA;
1769 /* find the position */
1770 pos = st->index_entries[index].pos;
1771 timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1);
1773 av_dlog(s, "XX %"PRId64" %d %"PRId64"\n",
1774 timestamp, index, st->index_entries[index].timestamp);
1776 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1777 /* One and only one real stream for DV in AVI, and it has video */
1778 /* offsets. Calling with other stream indexes should have failed */
1779 /* the av_index_search_timestamp call above. */
1781 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
1784 /* Feed the DV video stream version of the timestamp to the */
1785 /* DV demux so it can synthesize correct timestamps. */
1786 ff_dv_offset_reset(avi->dv_demux, timestamp);
1788 avi->stream_index = -1;
1793 for (i = 0; i < s->nb_streams; i++) {
1794 AVStream *st2 = s->streams[i];
1795 AVIStream *ast2 = st2->priv_data;
1798 ast2->remaining = 0;
1800 if (ast2->sub_ctx) {
1801 seek_subtitle(st, st2, timestamp);
1805 if (st2->nb_index_entries <= 0)
1808 // av_assert1(st2->codec->block_align);
1809 av_assert0(fabs(av_q2d(st2->time_base) - ast2->scale / (double)ast2->rate) < av_q2d(st2->time_base) * 0.00000001);
1810 index = av_index_search_timestamp(st2,
1811 av_rescale_q(timestamp,
1814 FFMAX(ast2->sample_size, 1),
1816 AVSEEK_FLAG_BACKWARD |
1817 (st2->codec->codec_type != AVMEDIA_TYPE_VIDEO ? AVSEEK_FLAG_ANY : 0));
1820 ast2->seek_pos = st2->index_entries[index].pos;
1821 pos_min = FFMIN(pos_min,ast2->seek_pos);
1823 for (i = 0; i < s->nb_streams; i++) {
1824 AVStream *st2 = s->streams[i];
1825 AVIStream *ast2 = st2->priv_data;
1827 if (ast2->sub_ctx || st2->nb_index_entries <= 0)
1830 index = av_index_search_timestamp(
1832 av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
1833 flags | AVSEEK_FLAG_BACKWARD | (st2->codec->codec_type != AVMEDIA_TYPE_VIDEO ? AVSEEK_FLAG_ANY : 0));
1836 while (!avi->non_interleaved && index>0 && st2->index_entries[index-1].pos >= pos_min)
1838 ast2->frame_offset = st2->index_entries[index].timestamp;
1842 if (avio_seek(s->pb, pos_min, SEEK_SET) < 0) {
1843 av_log(s, AV_LOG_ERROR, "Seek failed\n");
1846 avi->stream_index = -1;
1847 avi->dts_max = INT_MIN;
1851 static int avi_read_close(AVFormatContext *s)
1854 AVIContext *avi = s->priv_data;
1856 for (i = 0; i < s->nb_streams; i++) {
1857 AVStream *st = s->streams[i];
1858 AVIStream *ast = st->priv_data;
1861 av_freep(&ast->sub_ctx->pb);
1862 avformat_close_input(&ast->sub_ctx);
1864 av_freep(&ast->sub_buffer);
1865 av_free_packet(&ast->sub_pkt);
1869 av_freep(&avi->dv_demux);
1874 static int avi_probe(AVProbeData *p)
1878 /* check file header */
1879 for (i = 0; avi_headers[i][0]; i++)
1880 if (AV_RL32(p->buf ) == AV_RL32(avi_headers[i] ) &&
1881 AV_RL32(p->buf + 8) == AV_RL32(avi_headers[i] + 4))
1882 return AVPROBE_SCORE_MAX;
1887 AVInputFormat ff_avi_demuxer = {
1889 .long_name = NULL_IF_CONFIG_SMALL("AVI (Audio Video Interleaved)"),
1890 .priv_data_size = sizeof(AVIContext),
1891 .extensions = "avi",
1892 .read_probe = avi_probe,
1893 .read_header = avi_read_header,
1894 .read_packet = avi_read_packet,
1895 .read_close = avi_read_close,
1896 .read_seek = avi_read_seek,
1897 .priv_class = &demuxer_class,