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"
38 #include "libavcodec/bytestream.h"
39 #include "libavcodec/exif.h"
40 #include "libavcodec/internal.h"
42 typedef struct AVIStream {
43 int64_t frame_offset; /* current frame (video) or byte (audio) counter
44 * (used to compute the pts) */
51 int sample_size; /* size of one sample (or packet)
52 * (in the rate/scale sense) in bytes */
54 int64_t cum_len; /* temporary storage (used during seek) */
55 int prefix; /* normally 'd'<<8 + 'c' or 'w'<<8 + 'b' */
59 int dshow_block_align; /* block align variable used to emulate bugs in
60 * the MS dshow demuxer */
62 AVFormatContext *sub_ctx;
69 typedef struct AVIContext {
81 DVDemuxContext *dv_demux;
84 #define MAX_ODML_DEPTH 1000
89 static const AVOption options[] = {
90 { "use_odml", "use odml index", offsetof(AVIContext, use_odml), AV_OPT_TYPE_BOOL, {.i64 = 1}, -1, 1, AV_OPT_FLAG_DECODING_PARAM},
94 static const AVClass demuxer_class = {
96 .item_name = av_default_item_name,
98 .version = LIBAVUTIL_VERSION_INT,
99 .category = AV_CLASS_CATEGORY_DEMUXER,
103 static const char avi_headers[][8] = {
104 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', ' ' },
105 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 'X' },
106 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 0x19 },
107 { 'O', 'N', '2', ' ', 'O', 'N', '2', 'f' },
108 { 'R', 'I', 'F', 'F', 'A', 'M', 'V', ' ' },
112 static const AVMetadataConv avi_metadata_conv[] = {
117 static int avi_load_index(AVFormatContext *s);
118 static int guess_ni_flag(AVFormatContext *s);
120 #define print_tag(s, str, tag, size) \
121 av_log(s, AV_LOG_TRACE, "pos:%"PRIX64" %s: tag=%s size=0x%x\n", \
122 avio_tell(pb), str, av_fourcc2str(tag), size) \
124 static inline int get_duration(AVIStream *ast, int len)
126 if (ast->sample_size)
128 else if (ast->dshow_block_align)
129 return (len + ast->dshow_block_align - 1) / ast->dshow_block_align;
134 static int get_riff(AVFormatContext *s, AVIOContext *pb)
136 AVIContext *avi = s->priv_data;
137 char header[8] = {0};
140 /* check RIFF header */
141 avio_read(pb, header, 4);
142 avi->riff_end = avio_rl32(pb); /* RIFF chunk size */
143 avi->riff_end += avio_tell(pb); /* RIFF chunk end */
144 avio_read(pb, header + 4, 4);
146 for (i = 0; avi_headers[i][0]; i++)
147 if (!memcmp(header, avi_headers[i], 8))
149 if (!avi_headers[i][0])
150 return AVERROR_INVALIDDATA;
152 if (header[7] == 0x19)
153 av_log(s, AV_LOG_INFO,
154 "This file has been generated by a totally broken muxer.\n");
159 static int read_odml_index(AVFormatContext *s, int frame_num)
161 AVIContext *avi = s->priv_data;
162 AVIOContext *pb = s->pb;
163 int longs_per_entry = avio_rl16(pb);
164 int index_sub_type = avio_r8(pb);
165 int index_type = avio_r8(pb);
166 int entries_in_use = avio_rl32(pb);
167 int chunk_id = avio_rl32(pb);
168 int64_t base = avio_rl64(pb);
169 int stream_id = ((chunk_id & 0xFF) - '0') * 10 +
170 ((chunk_id >> 8 & 0xFF) - '0');
174 int64_t last_pos = -1;
175 int64_t filesize = avi->fsize;
177 av_log(s, AV_LOG_TRACE,
178 "longs_per_entry:%d index_type:%d entries_in_use:%d "
179 "chunk_id:%X base:%16"PRIX64" frame_num:%d\n",
187 if (stream_id >= s->nb_streams || stream_id < 0)
188 return AVERROR_INVALIDDATA;
189 st = s->streams[stream_id];
193 return AVERROR_INVALIDDATA;
197 if (index_type && longs_per_entry != 2)
198 return AVERROR_INVALIDDATA;
200 return AVERROR_INVALIDDATA;
202 if (filesize > 0 && base >= filesize) {
203 av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
204 if (base >> 32 == (base & 0xFFFFFFFF) &&
205 (base & 0xFFFFFFFF) < filesize &&
206 filesize <= 0xFFFFFFFF)
209 return AVERROR_INVALIDDATA;
212 for (i = 0; i < entries_in_use; i++) {
214 int64_t pos = avio_rl32(pb) + base - 8;
215 int len = avio_rl32(pb);
219 av_log(s, AV_LOG_TRACE, "pos:%"PRId64", len:%X\n", pos, len);
222 return AVERROR_INVALIDDATA;
224 if (last_pos == pos || pos == base - 8)
225 avi->non_interleaved = 1;
226 if (last_pos != pos && len)
227 av_add_index_entry(st, pos, ast->cum_len, len, 0,
228 key ? AVINDEX_KEYFRAME : 0);
230 ast->cum_len += get_duration(ast, len);
235 offset = avio_rl64(pb);
236 avio_rl32(pb); /* size */
237 duration = avio_rl32(pb);
240 return AVERROR_INVALIDDATA;
244 if (avi->odml_depth > MAX_ODML_DEPTH) {
245 av_log(s, AV_LOG_ERROR, "Too deeply nested ODML indexes\n");
246 return AVERROR_INVALIDDATA;
249 if (avio_seek(pb, offset + 8, SEEK_SET) < 0)
252 read_odml_index(s, frame_num);
254 frame_num += duration;
256 if (avio_seek(pb, pos, SEEK_SET) < 0) {
257 av_log(s, AV_LOG_ERROR, "Failed to restore position after reading index\n");
263 avi->index_loaded = 2;
267 static void clean_index(AVFormatContext *s)
272 for (i = 0; i < s->nb_streams; i++) {
273 AVStream *st = s->streams[i];
274 AVIStream *ast = st->priv_data;
275 int n = st->nb_index_entries;
276 int max = ast->sample_size;
277 int64_t pos, size, ts;
279 if (n != 1 || ast->sample_size == 0)
285 pos = st->index_entries[0].pos;
286 size = st->index_entries[0].size;
287 ts = st->index_entries[0].timestamp;
289 for (j = 0; j < size; j += max)
290 av_add_index_entry(st, pos + j, ts + j, FFMIN(max, size - j), 0,
295 static int avi_read_tag(AVFormatContext *s, AVStream *st, uint32_t tag,
298 AVIOContext *pb = s->pb;
304 if (size == UINT_MAX)
305 return AVERROR(EINVAL);
306 value = av_malloc(size + 1);
308 return AVERROR(ENOMEM);
309 if (avio_read(pb, value, size) != size) {
311 return AVERROR_INVALIDDATA;
317 return av_dict_set(st ? &st->metadata : &s->metadata, key, value,
318 AV_DICT_DONT_STRDUP_VAL);
321 static const char months[12][4] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
322 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
324 static void avi_metadata_creation_time(AVDictionary **metadata, char *date)
326 char month[4], time[9], buffer[64];
328 /* parse standard AVI date format (ie. "Mon Mar 10 15:04:43 2003") */
329 if (sscanf(date, "%*3s%*[ ]%3s%*[ ]%2d%*[ ]%8s%*[ ]%4d",
330 month, &day, time, &year) == 4) {
331 for (i = 0; i < 12; i++)
332 if (!av_strcasecmp(month, months[i])) {
333 snprintf(buffer, sizeof(buffer), "%.4d-%.2d-%.2d %s",
334 year, i + 1, day, time);
335 av_dict_set(metadata, "creation_time", buffer, 0);
337 } else if (date[4] == '/' && date[7] == '/') {
338 date[4] = date[7] = '-';
339 av_dict_set(metadata, "creation_time", date, 0);
343 static void avi_read_nikon(AVFormatContext *s, uint64_t end)
345 while (avio_tell(s->pb) < end && !avio_feof(s->pb)) {
346 uint32_t tag = avio_rl32(s->pb);
347 uint32_t size = avio_rl32(s->pb);
349 case MKTAG('n', 'c', 't', 'g'): /* Nikon Tags */
351 uint64_t tag_end = avio_tell(s->pb) + size;
352 while (avio_tell(s->pb) < tag_end && !avio_feof(s->pb)) {
353 uint16_t tag = avio_rl16(s->pb);
354 uint16_t size = avio_rl16(s->pb);
355 const char *name = NULL;
356 char buffer[64] = { 0 };
357 size = FFMIN(size, tag_end - avio_tell(s->pb));
358 size -= avio_read(s->pb, buffer,
359 FFMIN(size, sizeof(buffer) - 1));
368 name = "creation_time";
369 if (buffer[4] == ':' && buffer[7] == ':')
370 buffer[4] = buffer[7] = '-';
374 av_dict_set(&s->metadata, name, buffer, 0);
375 avio_skip(s->pb, size);
380 avio_skip(s->pb, size);
386 static int avi_extract_stream_metadata(AVFormatContext *s, AVStream *st)
389 uint8_t *data = st->codecpar->extradata;
390 int data_size = st->codecpar->extradata_size;
393 if (!data || data_size < 8) {
394 return AVERROR_INVALIDDATA;
397 bytestream2_init(&gb, data, data_size);
399 tag = bytestream2_get_le32(&gb);
402 case MKTAG('A', 'V', 'I', 'F'):
403 // skip 4 byte padding
404 bytestream2_skip(&gb, 4);
405 offset = bytestream2_tell(&gb);
407 // decode EXIF tags from IFD, AVI is always little-endian
408 return avpriv_exif_decode_ifd(s, data + offset, data_size - offset,
409 1, 0, &st->metadata);
411 case MKTAG('C', 'A', 'S', 'I'):
412 avpriv_request_sample(s, "RIFF stream data tag type CASI (%u)", tag);
414 case MKTAG('Z', 'o', 'r', 'a'):
415 avpriv_request_sample(s, "RIFF stream data tag type Zora (%u)", tag);
424 static int calculate_bitrate(AVFormatContext *s)
426 AVIContext *avi = s->priv_data;
431 for (i = 0; i<s->nb_streams; i++) {
433 AVStream *st = s->streams[i];
435 if (!st->nb_index_entries)
438 for (j = 0; j < st->nb_index_entries; j++)
439 len += st->index_entries[j].size;
440 maxpos = FFMAX(maxpos, st->index_entries[j-1].pos);
443 if (maxpos < avi->io_fsize*9/10) // index does not cover the whole file
445 if (lensum*9/10 > maxpos || lensum < maxpos*9/10) // frame sum and filesize mismatch
448 for (i = 0; i<s->nb_streams; i++) {
450 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->codecpar->bit_rate > 0)
459 duration = st->index_entries[j-1].timestamp - st->index_entries[0].timestamp;
460 bitrate = av_rescale(8*len, st->time_base.den, duration * st->time_base.num);
462 st->codecpar->bit_rate = bitrate;
468 static int avi_read_header(AVFormatContext *s)
470 AVIContext *avi = s->priv_data;
471 AVIOContext *pb = s->pb;
472 unsigned int tag, tag1, handler;
473 int codec_type, stream_index, frame_period;
477 AVIStream *ast = NULL;
478 int avih_width = 0, avih_height = 0;
479 int amv_file_format = 0;
480 uint64_t list_end = 0;
483 AVDictionaryEntry *dict_entry;
485 avi->stream_index = -1;
487 ret = get_riff(s, pb);
491 av_log(avi, AV_LOG_DEBUG, "use odml:%d\n", avi->use_odml);
493 avi->io_fsize = avi->fsize = avio_size(pb);
494 if (avi->fsize <= 0 || avi->fsize < avi->riff_end)
495 avi->fsize = avi->riff_end == 8 ? INT64_MAX : avi->riff_end;
505 size = avio_rl32(pb);
507 print_tag(s, "tag", tag, size);
510 case MKTAG('L', 'I', 'S', 'T'):
511 list_end = avio_tell(pb) + size;
512 /* Ignored, except at start of video packets. */
513 tag1 = avio_rl32(pb);
515 print_tag(s, "list", tag1, 0);
517 if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
518 avi->movi_list = avio_tell(pb) - 4;
520 avi->movi_end = avi->movi_list + size + (size & 1);
522 avi->movi_end = avi->fsize;
523 av_log(s, AV_LOG_TRACE, "movi end=%"PRIx64"\n", avi->movi_end);
525 } else if (tag1 == MKTAG('I', 'N', 'F', 'O'))
526 ff_read_riff_info(s, size - 4);
527 else if (tag1 == MKTAG('n', 'c', 'd', 't'))
528 avi_read_nikon(s, list_end);
531 case MKTAG('I', 'D', 'I', 'T'):
533 unsigned char date[64] = { 0 };
535 size -= avio_read(pb, date, FFMIN(size, sizeof(date) - 1));
537 avi_metadata_creation_time(&s->metadata, date);
540 case MKTAG('d', 'm', 'l', 'h'):
542 avio_skip(pb, size + (size & 1));
544 case MKTAG('a', 'm', 'v', 'h'):
546 case MKTAG('a', 'v', 'i', 'h'):
548 /* using frame_period is bad idea */
549 frame_period = avio_rl32(pb);
550 avio_rl32(pb); /* max. bytes per second */
552 avi->non_interleaved |= avio_rl32(pb) & AVIF_MUSTUSEINDEX;
554 avio_skip(pb, 2 * 4);
557 avih_width = avio_rl32(pb);
558 avih_height = avio_rl32(pb);
560 avio_skip(pb, size - 10 * 4);
562 case MKTAG('s', 't', 'r', 'h'):
565 tag1 = avio_rl32(pb);
566 handler = avio_rl32(pb); /* codec tag */
568 if (tag1 == MKTAG('p', 'a', 'd', 's')) {
569 avio_skip(pb, size - 8);
573 st = avformat_new_stream(s, NULL);
577 st->id = stream_index;
578 ast = av_mallocz(sizeof(AVIStream));
584 tag1 = stream_index ? MKTAG('a', 'u', 'd', 's')
585 : MKTAG('v', 'i', 'd', 's');
587 print_tag(s, "strh", tag1, -1);
589 if (tag1 == MKTAG('i', 'a', 'v', 's') ||
590 tag1 == MKTAG('i', 'v', 'a', 's')) {
593 /* After some consideration -- I don't think we
594 * have to support anything but DV in type1 AVIs. */
595 if (s->nb_streams != 1)
598 if (handler != MKTAG('d', 'v', 's', 'd') &&
599 handler != MKTAG('d', 'v', 'h', 'd') &&
600 handler != MKTAG('d', 'v', 's', 'l'))
603 ast = s->streams[0]->priv_data;
604 av_freep(&s->streams[0]->codecpar->extradata);
605 av_freep(&s->streams[0]->codecpar);
606 #if FF_API_LAVF_AVCTX
607 FF_DISABLE_DEPRECATION_WARNINGS
608 av_freep(&s->streams[0]->codec);
609 FF_ENABLE_DEPRECATION_WARNINGS
611 if (s->streams[0]->info)
612 av_freep(&s->streams[0]->info->duration_error);
613 av_freep(&s->streams[0]->info);
614 if (s->streams[0]->internal)
615 av_freep(&s->streams[0]->internal->avctx);
616 av_freep(&s->streams[0]->internal);
617 av_freep(&s->streams[0]);
619 if (CONFIG_DV_DEMUXER) {
620 avi->dv_demux = avpriv_dv_init_demux(s);
625 s->streams[0]->priv_data = ast;
626 avio_skip(pb, 3 * 4);
627 ast->scale = avio_rl32(pb);
628 ast->rate = avio_rl32(pb);
629 avio_skip(pb, 4); /* start time */
631 dv_dur = avio_rl32(pb);
632 if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
633 dv_dur *= AV_TIME_BASE;
634 s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
636 /* else, leave duration alone; timing estimation in utils.c
637 * will make a guess based on bitrate. */
639 stream_index = s->nb_streams - 1;
640 avio_skip(pb, size - 9 * 4);
644 av_assert0(stream_index < s->nb_streams);
645 ast->handler = handler;
647 avio_rl32(pb); /* flags */
648 avio_rl16(pb); /* priority */
649 avio_rl16(pb); /* language */
650 avio_rl32(pb); /* initial frame */
651 ast->scale = avio_rl32(pb);
652 ast->rate = avio_rl32(pb);
653 if (!(ast->scale && ast->rate)) {
654 av_log(s, AV_LOG_WARNING,
655 "scale/rate is %"PRIu32"/%"PRIu32" which is invalid. "
656 "(This file has been generated by broken software.)\n",
661 ast->scale = frame_period;
667 avpriv_set_pts_info(st, 64, ast->scale, ast->rate);
669 ast->cum_len = avio_rl32(pb); /* start */
670 st->nb_frames = avio_rl32(pb);
673 avio_rl32(pb); /* buffer size */
674 avio_rl32(pb); /* quality */
675 if (ast->cum_len > 3600LL * ast->rate / ast->scale) {
676 av_log(s, AV_LOG_ERROR, "crazy start time, iam scared, giving up\n");
679 ast->sample_size = avio_rl32(pb);
680 ast->cum_len *= FFMAX(1, ast->sample_size);
681 av_log(s, AV_LOG_TRACE, "%"PRIu32" %"PRIu32" %d\n",
682 ast->rate, ast->scale, ast->sample_size);
685 case MKTAG('v', 'i', 'd', 's'):
686 codec_type = AVMEDIA_TYPE_VIDEO;
688 ast->sample_size = 0;
689 st->avg_frame_rate = av_inv_q(st->time_base);
691 case MKTAG('a', 'u', 'd', 's'):
692 codec_type = AVMEDIA_TYPE_AUDIO;
694 case MKTAG('t', 'x', 't', 's'):
695 codec_type = AVMEDIA_TYPE_SUBTITLE;
697 case MKTAG('d', 'a', 't', 's'):
698 codec_type = AVMEDIA_TYPE_DATA;
701 av_log(s, AV_LOG_INFO, "unknown stream type %X\n", tag1);
704 if (ast->sample_size < 0) {
705 if (s->error_recognition & AV_EF_EXPLODE) {
706 av_log(s, AV_LOG_ERROR,
707 "Invalid sample_size %d at stream %d\n",
712 av_log(s, AV_LOG_WARNING,
713 "Invalid sample_size %d at stream %d "
717 ast->sample_size = 0;
720 if (ast->sample_size == 0) {
721 st->duration = st->nb_frames;
722 if (st->duration > 0 && avi->io_fsize > 0 && avi->riff_end > avi->io_fsize) {
723 av_log(s, AV_LOG_DEBUG, "File is truncated adjusting duration\n");
724 st->duration = av_rescale(st->duration, avi->io_fsize, avi->riff_end);
727 ast->frame_offset = ast->cum_len;
728 avio_skip(pb, size - 12 * 4);
730 case MKTAG('s', 't', 'r', 'f'):
732 if (!size && (codec_type == AVMEDIA_TYPE_AUDIO ||
733 codec_type == AVMEDIA_TYPE_VIDEO))
735 if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
738 uint64_t cur_pos = avio_tell(pb);
740 if (cur_pos < list_end)
741 size = FFMIN(size, list_end - cur_pos);
742 st = s->streams[stream_index];
743 if (st->codecpar->codec_type != AVMEDIA_TYPE_UNKNOWN) {
747 switch (codec_type) {
748 case AVMEDIA_TYPE_VIDEO:
749 if (amv_file_format) {
750 st->codecpar->width = avih_width;
751 st->codecpar->height = avih_height;
752 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
753 st->codecpar->codec_id = AV_CODEC_ID_AMV;
757 tag1 = ff_get_bmp_header(pb, st, &esize);
759 if (tag1 == MKTAG('D', 'X', 'S', 'B') ||
760 tag1 == MKTAG('D', 'X', 'S', 'A')) {
761 st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
762 st->codecpar->codec_tag = tag1;
763 st->codecpar->codec_id = AV_CODEC_ID_XSUB;
767 if (size > 10 * 4 && size < (1 << 30) && size < avi->fsize) {
768 if (esize == size-1 && (esize&1)) {
769 st->codecpar->extradata_size = esize - 10 * 4;
771 st->codecpar->extradata_size = size - 10 * 4;
772 if (st->codecpar->extradata) {
773 av_log(s, AV_LOG_WARNING, "New extradata in strf chunk, freeing previous one.\n");
774 av_freep(&st->codecpar->extradata);
776 if (ff_get_extradata(s, st->codecpar, pb, st->codecpar->extradata_size) < 0)
777 return AVERROR(ENOMEM);
780 // FIXME: check if the encoder really did this correctly
781 if (st->codecpar->extradata_size & 1)
784 /* Extract palette from extradata if bpp <= 8.
785 * This code assumes that extradata contains only palette.
786 * This is true for all paletted codecs implemented in
788 if (st->codecpar->extradata_size &&
789 (st->codecpar->bits_per_coded_sample <= 8)) {
790 int pal_size = (1 << st->codecpar->bits_per_coded_sample) << 2;
791 const uint8_t *pal_src;
793 pal_size = FFMIN(pal_size, st->codecpar->extradata_size);
794 pal_src = st->codecpar->extradata +
795 st->codecpar->extradata_size - pal_size;
796 /* Exclude the "BottomUp" field from the palette */
797 if (pal_src - st->codecpar->extradata >= 9 &&
798 !memcmp(st->codecpar->extradata + st->codecpar->extradata_size - 9, "BottomUp", 9))
800 for (i = 0; i < pal_size / 4; i++)
801 ast->pal[i] = 0xFFU<<24 | AV_RL32(pal_src + 4 * i);
805 print_tag(s, "video", tag1, 0);
807 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
808 st->codecpar->codec_tag = tag1;
809 st->codecpar->codec_id = ff_codec_get_id(ff_codec_bmp_tags,
811 /* If codec is not found yet, try with the mov tags. */
812 if (!st->codecpar->codec_id) {
813 st->codecpar->codec_id =
814 ff_codec_get_id(ff_codec_movvideo_tags, tag1);
815 if (st->codecpar->codec_id)
816 av_log(s, AV_LOG_WARNING,
817 "mov tag found in avi (fourcc %s)\n",
818 av_fourcc2str(tag1));
820 if (!st->codecpar->codec_id)
821 st->codecpar->codec_id = ff_codec_get_id(ff_codec_bmp_tags_unofficial, tag1);
823 /* This is needed to get the pict type which is necessary
824 * for generating correct pts. */
825 st->need_parsing = AVSTREAM_PARSE_HEADERS;
827 if (st->codecpar->codec_id == AV_CODEC_ID_MPEG4 &&
828 ast->handler == MKTAG('X', 'V', 'I', 'D'))
829 st->codecpar->codec_tag = MKTAG('X', 'V', 'I', 'D');
831 if (st->codecpar->codec_tag == MKTAG('V', 'S', 'S', 'H'))
832 st->need_parsing = AVSTREAM_PARSE_FULL;
833 if (st->codecpar->codec_id == AV_CODEC_ID_RV40)
834 st->need_parsing = AVSTREAM_PARSE_NONE;
836 if (st->codecpar->codec_tag == 0 && st->codecpar->height > 0 &&
837 st->codecpar->extradata_size < 1U << 30) {
838 st->codecpar->extradata_size += 9;
839 if ((ret = av_reallocp(&st->codecpar->extradata,
840 st->codecpar->extradata_size +
841 AV_INPUT_BUFFER_PADDING_SIZE)) < 0) {
842 st->codecpar->extradata_size = 0;
845 memcpy(st->codecpar->extradata + st->codecpar->extradata_size - 9,
848 st->codecpar->height = FFABS(st->codecpar->height);
850 // avio_skip(pb, size - 5 * 4);
852 case AVMEDIA_TYPE_AUDIO:
853 ret = ff_get_wav_header(s, pb, st->codecpar, size, 0);
856 ast->dshow_block_align = st->codecpar->block_align;
857 if (ast->sample_size && st->codecpar->block_align &&
858 ast->sample_size != st->codecpar->block_align) {
861 "sample size (%d) != block align (%d)\n",
863 st->codecpar->block_align);
864 ast->sample_size = st->codecpar->block_align;
867 * (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
870 /* Force parsing as several audio frames can be in
871 * one packet and timestamps refer to packet start. */
872 st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
873 /* ADTS header is in extradata, AAC without header must be
874 * stored as exact frames. Parser not needed and it will
876 if (st->codecpar->codec_id == AV_CODEC_ID_AAC &&
877 st->codecpar->extradata_size)
878 st->need_parsing = AVSTREAM_PARSE_NONE;
879 // The flac parser does not work with AVSTREAM_PARSE_TIMESTAMPS
880 if (st->codecpar->codec_id == AV_CODEC_ID_FLAC)
881 st->need_parsing = AVSTREAM_PARSE_NONE;
882 /* AVI files with Xan DPCM audio (wrongly) declare PCM
883 * audio in the header but have Axan as stream_code_tag. */
884 if (ast->handler == AV_RL32("Axan")) {
885 st->codecpar->codec_id = AV_CODEC_ID_XAN_DPCM;
886 st->codecpar->codec_tag = 0;
887 ast->dshow_block_align = 0;
889 if (amv_file_format) {
890 st->codecpar->codec_id = AV_CODEC_ID_ADPCM_IMA_AMV;
891 ast->dshow_block_align = 0;
893 if ((st->codecpar->codec_id == AV_CODEC_ID_AAC ||
894 st->codecpar->codec_id == AV_CODEC_ID_FLAC ||
895 st->codecpar->codec_id == AV_CODEC_ID_MP2 ) && ast->dshow_block_align <= 4 && ast->dshow_block_align) {
896 av_log(s, AV_LOG_DEBUG, "overriding invalid dshow_block_align of %d\n", ast->dshow_block_align);
897 ast->dshow_block_align = 0;
899 if (st->codecpar->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align == 1024 && ast->sample_size == 1024 ||
900 st->codecpar->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align == 4096 && ast->sample_size == 4096 ||
901 st->codecpar->codec_id == AV_CODEC_ID_MP3 && ast->dshow_block_align == 1152 && ast->sample_size == 1152) {
902 av_log(s, AV_LOG_DEBUG, "overriding sample_size\n");
903 ast->sample_size = 0;
906 case AVMEDIA_TYPE_SUBTITLE:
907 st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
908 st->request_probe= 1;
912 st->codecpar->codec_type = AVMEDIA_TYPE_DATA;
913 st->codecpar->codec_id = AV_CODEC_ID_NONE;
914 st->codecpar->codec_tag = 0;
920 case MKTAG('s', 't', 'r', 'd'):
921 if (stream_index >= (unsigned)s->nb_streams
922 || s->streams[stream_index]->codecpar->extradata_size
923 || s->streams[stream_index]->codecpar->codec_tag == MKTAG('H','2','6','4')) {
926 uint64_t cur_pos = avio_tell(pb);
927 if (cur_pos < list_end)
928 size = FFMIN(size, list_end - cur_pos);
929 st = s->streams[stream_index];
932 if (st->codecpar->extradata) {
933 av_log(s, AV_LOG_WARNING, "New extradata in strd chunk, freeing previous one.\n");
934 av_freep(&st->codecpar->extradata);
936 if (ff_get_extradata(s, st->codecpar, pb, size) < 0)
937 return AVERROR(ENOMEM);
940 if (st->codecpar->extradata_size & 1) //FIXME check if the encoder really did this correctly
943 ret = avi_extract_stream_metadata(s, st);
945 av_log(s, AV_LOG_WARNING, "could not decoding EXIF data in stream header.\n");
949 case MKTAG('i', 'n', 'd', 'x'):
951 if ((pb->seekable & AVIO_SEEKABLE_NORMAL) && !(s->flags & AVFMT_FLAG_IGNIDX) &&
953 read_odml_index(s, 0) < 0 &&
954 (s->error_recognition & AV_EF_EXPLODE))
956 avio_seek(pb, pos + size, SEEK_SET);
958 case MKTAG('v', 'p', 'r', 'p'):
959 if (stream_index < (unsigned)s->nb_streams && size > 9 * 4) {
960 AVRational active, active_aspect;
962 st = s->streams[stream_index];
969 active_aspect.den = avio_rl16(pb);
970 active_aspect.num = avio_rl16(pb);
971 active.num = avio_rl32(pb);
972 active.den = avio_rl32(pb);
973 avio_rl32(pb); // nbFieldsPerFrame
975 if (active_aspect.num && active_aspect.den &&
976 active.num && active.den) {
977 st->sample_aspect_ratio = av_div_q(active_aspect, active);
978 av_log(s, AV_LOG_TRACE, "vprp %d/%d %d/%d\n",
979 active_aspect.num, active_aspect.den,
980 active.num, active.den);
986 case MKTAG('s', 't', 'r', 'n'):
988 ret = avi_read_tag(s, s->streams[s->nb_streams - 1], tag, size);
994 if (size > 1000000) {
995 av_log(s, AV_LOG_ERROR,
996 "Something went wrong during header parsing, "
997 "tag %s has size %u, "
998 "I will ignore it and try to continue anyway.\n",
999 av_fourcc2str(tag), size);
1000 if (s->error_recognition & AV_EF_EXPLODE)
1002 avi->movi_list = avio_tell(pb) - 4;
1003 avi->movi_end = avi->fsize;
1006 /* Do not fail for very large idx1 tags */
1007 case MKTAG('i', 'd', 'x', '1'):
1010 avio_skip(pb, size);
1016 /* check stream number */
1017 if (stream_index != s->nb_streams - 1) {
1020 return AVERROR_INVALIDDATA;
1023 if (!avi->index_loaded && (pb->seekable & AVIO_SEEKABLE_NORMAL))
1025 calculate_bitrate(s);
1026 avi->index_loaded |= 1;
1028 if ((ret = guess_ni_flag(s)) < 0)
1031 avi->non_interleaved |= ret | (s->flags & AVFMT_FLAG_SORT_DTS);
1033 dict_entry = av_dict_get(s->metadata, "ISFT", NULL, 0);
1034 if (dict_entry && !strcmp(dict_entry->value, "PotEncoder"))
1035 for (i = 0; i < s->nb_streams; i++) {
1036 AVStream *st = s->streams[i];
1037 if ( st->codecpar->codec_id == AV_CODEC_ID_MPEG1VIDEO
1038 || st->codecpar->codec_id == AV_CODEC_ID_MPEG2VIDEO)
1039 st->need_parsing = AVSTREAM_PARSE_FULL;
1042 for (i = 0; i < s->nb_streams; i++) {
1043 AVStream *st = s->streams[i];
1044 if (st->nb_index_entries)
1047 // DV-in-AVI cannot be non-interleaved, if set this must be
1050 avi->non_interleaved = 0;
1051 if (i == s->nb_streams && avi->non_interleaved) {
1052 av_log(s, AV_LOG_WARNING,
1053 "Non-interleaved AVI without index, switching to interleaved\n");
1054 avi->non_interleaved = 0;
1057 if (avi->non_interleaved) {
1058 av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
1062 ff_metadata_conv_ctx(s, NULL, avi_metadata_conv);
1063 ff_metadata_conv_ctx(s, NULL, ff_riff_info_conv);
1068 static int read_gab2_sub(AVFormatContext *s, AVStream *st, AVPacket *pkt)
1070 if (pkt->size >= 7 &&
1071 pkt->size < INT_MAX - AVPROBE_PADDING_SIZE &&
1072 !strcmp(pkt->data, "GAB2") && AV_RL16(pkt->data + 5) == 2) {
1074 int score = AVPROBE_SCORE_EXTENSION, ret;
1075 AVIStream *ast = st->priv_data;
1076 ff_const59 AVInputFormat *sub_demuxer;
1077 AVRational time_base;
1079 AVIOContext *pb = avio_alloc_context(pkt->data + 7,
1081 0, NULL, NULL, NULL, NULL);
1083 unsigned int desc_len = avio_rl32(pb);
1085 if (desc_len > pb->buf_end - pb->buf_ptr)
1088 ret = avio_get_str16le(pb, desc_len, desc, sizeof(desc));
1089 avio_skip(pb, desc_len - ret);
1091 av_dict_set(&st->metadata, "title", desc, 0);
1093 avio_rl16(pb); /* flags? */
1094 avio_rl32(pb); /* data size */
1096 size = pb->buf_end - pb->buf_ptr;
1097 pd = (AVProbeData) { .buf = av_mallocz(size + AVPROBE_PADDING_SIZE),
1101 memcpy(pd.buf, pb->buf_ptr, size);
1102 sub_demuxer = av_probe_input_format2(&pd, 1, &score);
1107 if (strcmp(sub_demuxer->name, "srt") && strcmp(sub_demuxer->name, "ass"))
1110 if (!(ast->sub_ctx = avformat_alloc_context()))
1113 ast->sub_ctx->pb = pb;
1115 if (ff_copy_whiteblacklists(ast->sub_ctx, s) < 0)
1118 if (!avformat_open_input(&ast->sub_ctx, "", sub_demuxer, NULL)) {
1119 if (ast->sub_ctx->nb_streams != 1)
1121 ff_read_packet(ast->sub_ctx, &ast->sub_pkt);
1122 avcodec_parameters_copy(st->codecpar, ast->sub_ctx->streams[0]->codecpar);
1123 time_base = ast->sub_ctx->streams[0]->time_base;
1124 avpriv_set_pts_info(st, 64, time_base.num, time_base.den);
1126 ast->sub_buffer = pkt->data;
1127 memset(pkt, 0, sizeof(*pkt));
1131 av_freep(&ast->sub_ctx);
1132 avio_context_free(&pb);
1137 static AVStream *get_subtitle_pkt(AVFormatContext *s, AVStream *next_st,
1140 AVIStream *ast, *next_ast = next_st->priv_data;
1141 int64_t ts, next_ts, ts_min = INT64_MAX;
1142 AVStream *st, *sub_st = NULL;
1145 next_ts = av_rescale_q(next_ast->frame_offset, next_st->time_base,
1148 for (i = 0; i < s->nb_streams; i++) {
1150 ast = st->priv_data;
1151 if (st->discard < AVDISCARD_ALL && ast && ast->sub_pkt.data) {
1152 ts = av_rescale_q(ast->sub_pkt.dts, st->time_base, AV_TIME_BASE_Q);
1153 if (ts <= next_ts && ts < ts_min) {
1161 ast = sub_st->priv_data;
1162 *pkt = ast->sub_pkt;
1163 pkt->stream_index = sub_st->index;
1165 if (ff_read_packet(ast->sub_ctx, &ast->sub_pkt) < 0)
1166 ast->sub_pkt.data = NULL;
1171 static int get_stream_idx(const unsigned *d)
1173 if (d[0] >= '0' && d[0] <= '9' &&
1174 d[1] >= '0' && d[1] <= '9') {
1175 return (d[0] - '0') * 10 + (d[1] - '0');
1177 return 100; // invalid stream ID
1183 * @param exit_early set to 1 to just gather packet position without making the changes needed to actually read & return the packet
1185 static int avi_sync(AVFormatContext *s, int exit_early)
1187 AVIContext *avi = s->priv_data;
1188 AVIOContext *pb = s->pb;
1195 memset(d, -1, sizeof(d));
1196 for (i = sync = avio_tell(pb); !avio_feof(pb); i++) {
1199 for (j = 0; j < 7; j++)
1203 size = d[4] + (d[5] << 8) + (d[6] << 16) + (d[7] << 24);
1205 n = get_stream_idx(d + 2);
1206 ff_tlog(s, "%X %X %X %X %X %X %X %X %"PRId64" %u %d\n",
1207 d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], i, size, n);
1208 if (i*(avi->io_fsize>0) + (uint64_t)size > avi->fsize || d[0] > 127)
1212 if ((d[0] == 'i' && d[1] == 'x' && n < s->nb_streams) ||
1214 (d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K') ||
1215 (d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1') ||
1216 (d[0] == 'i' && d[1] == 'n' && d[2] == 'd' && d[3] == 'x')) {
1217 avio_skip(pb, size);
1222 if (d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T') {
1227 n = get_stream_idx(d);
1229 if (!((i - avi->last_pkt_pos) & 1) &&
1230 get_stream_idx(d + 1) < s->nb_streams)
1233 // detect ##ix chunk and skip
1234 if (d[2] == 'i' && d[3] == 'x' && n < s->nb_streams) {
1235 avio_skip(pb, size);
1239 if (d[2] == 'w' && d[3] == 'c' && n < s->nb_streams) {
1240 avio_skip(pb, 16 * 3 + 8);
1244 if (avi->dv_demux && n != 0)
1248 if (n < s->nb_streams) {
1252 ast = st->priv_data;
1255 av_log(s, AV_LOG_WARNING, "Skipping foreign stream %d packet\n", n);
1259 if (s->nb_streams >= 2) {
1260 AVStream *st1 = s->streams[1];
1261 AVIStream *ast1 = st1->priv_data;
1262 // workaround for broken small-file-bug402.avi
1263 if ( d[2] == 'w' && d[3] == 'b'
1265 && st ->codecpar->codec_type == AVMEDIA_TYPE_VIDEO
1266 && st1->codecpar->codec_type == AVMEDIA_TYPE_AUDIO
1267 && ast->prefix == 'd'*256+'c'
1268 && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
1273 av_log(s, AV_LOG_WARNING,
1274 "Invalid stream + prefix combination, assuming audio.\n");
1278 if (d[2] == 'p' && d[3] == 'c' && size <= 4 * 256 + 4) {
1279 int k = avio_r8(pb);
1280 int last = (k + avio_r8(pb) - 1) & 0xFF;
1282 avio_rl16(pb); // flags
1284 // b + (g << 8) + (r << 16);
1285 for (; k <= last; k++)
1286 ast->pal[k] = 0xFFU<<24 | avio_rb32(pb)>>8;
1290 } else if (((ast->prefix_count < 5 || sync + 9 > i) &&
1291 d[2] < 128 && d[3] < 128) ||
1292 d[2] * 256 + d[3] == ast->prefix /* ||
1293 (d[2] == 'd' && d[3] == 'c') ||
1294 (d[2] == 'w' && d[3] == 'b') */) {
1297 if (d[2] * 256 + d[3] == ast->prefix)
1298 ast->prefix_count++;
1300 ast->prefix = d[2] * 256 + d[3];
1301 ast->prefix_count = 0;
1304 if (!avi->dv_demux &&
1305 ((st->discard >= AVDISCARD_DEFAULT && size == 0) /* ||
1306 // FIXME: needs a little reordering
1307 (st->discard >= AVDISCARD_NONKEY &&
1308 !(pkt->flags & AV_PKT_FLAG_KEY)) */
1309 || st->discard >= AVDISCARD_ALL)) {
1311 ast->frame_offset += get_duration(ast, size);
1312 avio_skip(pb, size);
1316 avi->stream_index = n;
1317 ast->packet_size = size + 8;
1318 ast->remaining = size;
1321 uint64_t pos = avio_tell(pb) - 8;
1322 if (!st->index_entries || !st->nb_index_entries ||
1323 st->index_entries[st->nb_index_entries - 1].pos < pos) {
1324 av_add_index_entry(st, pos, ast->frame_offset, size,
1325 0, AVINDEX_KEYFRAME);
1338 static int ni_prepare_read(AVFormatContext *s)
1340 AVIContext *avi = s->priv_data;
1341 int best_stream_index = 0;
1342 AVStream *best_st = NULL;
1343 AVIStream *best_ast;
1344 int64_t best_ts = INT64_MAX;
1347 for (i = 0; i < s->nb_streams; i++) {
1348 AVStream *st = s->streams[i];
1349 AVIStream *ast = st->priv_data;
1350 int64_t ts = ast->frame_offset;
1353 if (!st->nb_index_entries)
1356 last_ts = st->index_entries[st->nb_index_entries - 1].timestamp;
1357 if (!ast->remaining && ts > last_ts)
1360 ts = av_rescale_q(ts, st->time_base,
1361 (AVRational) { FFMAX(1, ast->sample_size),
1364 av_log(s, AV_LOG_TRACE, "%"PRId64" %d/%d %"PRId64"\n", ts,
1365 st->time_base.num, st->time_base.den, ast->frame_offset);
1369 best_stream_index = i;
1375 best_ast = best_st->priv_data;
1376 best_ts = best_ast->frame_offset;
1377 if (best_ast->remaining) {
1378 i = av_index_search_timestamp(best_st,
1381 AVSEEK_FLAG_BACKWARD);
1383 i = av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
1385 best_ast->frame_offset = best_st->index_entries[i].timestamp;
1389 int64_t pos = best_st->index_entries[i].pos;
1390 pos += best_ast->packet_size - best_ast->remaining;
1391 if (avio_seek(s->pb, pos + 8, SEEK_SET) < 0)
1394 av_assert0(best_ast->remaining <= best_ast->packet_size);
1396 avi->stream_index = best_stream_index;
1397 if (!best_ast->remaining)
1398 best_ast->packet_size =
1399 best_ast->remaining = best_st->index_entries[i].size;
1407 static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
1409 AVIContext *avi = s->priv_data;
1410 AVIOContext *pb = s->pb;
1413 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1414 int size = avpriv_dv_get_packet(avi->dv_demux, pkt);
1421 if (avi->non_interleaved) {
1422 err = ni_prepare_read(s);
1428 if (avi->stream_index >= 0) {
1429 AVStream *st = s->streams[avi->stream_index];
1430 AVIStream *ast = st->priv_data;
1433 if (get_subtitle_pkt(s, st, pkt))
1436 // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
1437 if (ast->sample_size <= 1)
1439 else if (ast->sample_size < 32)
1440 // arbitrary multiplier to avoid tiny packets for raw PCM data
1441 size = 1024 * ast->sample_size;
1443 size = ast->sample_size;
1445 if (size > ast->remaining)
1446 size = ast->remaining;
1447 avi->last_pkt_pos = avio_tell(pb);
1448 err = av_get_packet(pb, pkt, size);
1453 if (ast->has_pal && pkt->size < (unsigned)INT_MAX / 2) {
1455 pal = av_packet_new_side_data(pkt,
1456 AV_PKT_DATA_PALETTE,
1459 av_log(s, AV_LOG_ERROR,
1460 "Failed to allocate data for palette\n");
1462 memcpy(pal, ast->pal, AVPALETTE_SIZE);
1467 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1468 AVBufferRef *avbuf = pkt->buf;
1469 size = avpriv_dv_produce_packet(avi->dv_demux, pkt,
1470 pkt->data, pkt->size, pkt->pos);
1472 pkt->flags |= AV_PKT_FLAG_KEY;
1474 av_packet_unref(pkt);
1475 } else if (st->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE &&
1476 !st->codecpar->codec_tag && read_gab2_sub(s, st, pkt)) {
1477 ast->frame_offset++;
1478 avi->stream_index = -1;
1482 /* XXX: How to handle B-frames in AVI? */
1483 pkt->dts = ast->frame_offset;
1484 // pkt->dts += ast->start;
1485 if (ast->sample_size)
1486 pkt->dts /= ast->sample_size;
1487 pkt->stream_index = avi->stream_index;
1489 if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && st->index_entries) {
1493 index = av_index_search_timestamp(st, ast->frame_offset, AVSEEK_FLAG_ANY);
1494 e = &st->index_entries[index];
1496 if (index >= 0 && e->timestamp == ast->frame_offset) {
1497 if (index == st->nb_index_entries-1) {
1500 if (st->codecpar->codec_id == AV_CODEC_ID_MPEG4) {
1501 const uint8_t *ptr = pkt->data, *end = ptr + FFMIN(size, 256);
1503 ptr = avpriv_find_start_code(ptr, end, &state);
1504 if (state == 0x1B6 && ptr < end) {
1505 key = !(*ptr & 0xC0);
1511 e->flags &= ~AVINDEX_KEYFRAME;
1513 if (e->flags & AVINDEX_KEYFRAME)
1514 pkt->flags |= AV_PKT_FLAG_KEY;
1517 pkt->flags |= AV_PKT_FLAG_KEY;
1519 ast->frame_offset += get_duration(ast, pkt->size);
1521 ast->remaining -= err;
1522 if (!ast->remaining) {
1523 avi->stream_index = -1;
1524 ast->packet_size = 0;
1527 if (!avi->non_interleaved && pkt->pos >= 0 && ast->seek_pos > pkt->pos) {
1528 av_packet_unref(pkt);
1533 if (!avi->non_interleaved && st->nb_index_entries>1 && avi->index_loaded>1) {
1534 int64_t dts= av_rescale_q(pkt->dts, st->time_base, AV_TIME_BASE_Q);
1536 if (avi->dts_max - dts > 2*AV_TIME_BASE) {
1537 avi->non_interleaved= 1;
1538 av_log(s, AV_LOG_INFO, "Switching to NI mode, due to poor interleaving\n");
1539 }else if (avi->dts_max < dts)
1546 if ((err = avi_sync(s, 0)) < 0)
1551 /* XXX: We make the implicit supposition that the positions are sorted
1552 * for each stream. */
1553 static int avi_read_idx1(AVFormatContext *s, int size)
1555 AVIContext *avi = s->priv_data;
1556 AVIOContext *pb = s->pb;
1557 int nb_index_entries, i;
1561 unsigned int index, tag, flags, len, first_packet = 1;
1562 int64_t last_pos = -1;
1563 unsigned last_idx = -1;
1564 int64_t idx1_pos, first_packet_pos = 0, data_offset = 0;
1567 nb_index_entries = size / 16;
1568 if (nb_index_entries <= 0)
1569 return AVERROR_INVALIDDATA;
1571 idx1_pos = avio_tell(pb);
1572 avio_seek(pb, avi->movi_list + 4, SEEK_SET);
1573 if (avi_sync(s, 1) == 0)
1574 first_packet_pos = avio_tell(pb) - 8;
1575 avi->stream_index = -1;
1576 avio_seek(pb, idx1_pos, SEEK_SET);
1578 if (s->nb_streams == 1 && s->streams[0]->codecpar->codec_tag == AV_RL32("MMES")) {
1579 first_packet_pos = 0;
1580 data_offset = avi->movi_list;
1583 /* Read the entries and sort them in each stream component. */
1584 for (i = 0; i < nb_index_entries; i++) {
1588 tag = avio_rl32(pb);
1589 flags = avio_rl32(pb);
1590 pos = avio_rl32(pb);
1591 len = avio_rl32(pb);
1592 av_log(s, AV_LOG_TRACE, "%d: tag=0x%x flags=0x%x pos=0x%"PRIx64" len=%d/",
1593 i, tag, flags, pos, len);
1595 index = ((tag & 0xff) - '0') * 10;
1596 index += (tag >> 8 & 0xff) - '0';
1597 if (index >= s->nb_streams)
1599 st = s->streams[index];
1600 ast = st->priv_data;
1602 /* Skip 'xxpc' palette change entries in the index until a logic
1603 * to process these is properly implemented. */
1604 if ((tag >> 16 & 0xff) == 'p' && (tag >> 24 & 0xff) == 'c')
1607 if (first_packet && first_packet_pos) {
1608 if (avi->movi_list + 4 != pos || pos + 500 > first_packet_pos)
1609 data_offset = first_packet_pos - pos;
1614 av_log(s, AV_LOG_TRACE, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
1616 // even if we have only a single stream, we should
1617 // switch to non-interleaved to get correct timestamps
1618 if (last_pos == pos)
1619 avi->non_interleaved = 1;
1620 if (last_idx != pos && len) {
1621 av_add_index_entry(st, pos, ast->cum_len, len, 0,
1622 (flags & AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
1625 ast->cum_len += get_duration(ast, len);
1627 anykey |= flags&AVIIF_INDEX;
1630 for (index = 0; index < s->nb_streams; index++) {
1631 st = s->streams[index];
1632 if (st->nb_index_entries)
1633 st->index_entries[0].flags |= AVINDEX_KEYFRAME;
1639 /* Scan the index and consider any file with streams more than
1640 * 2 seconds or 64MB apart non-interleaved. */
1641 static int check_stream_max_drift(AVFormatContext *s)
1643 int64_t min_pos, pos;
1645 int *idx = av_mallocz_array(s->nb_streams, sizeof(*idx));
1647 return AVERROR(ENOMEM);
1648 for (min_pos = pos = 0; min_pos != INT64_MAX; pos = min_pos + 1LU) {
1649 int64_t max_dts = INT64_MIN / 2;
1650 int64_t min_dts = INT64_MAX / 2;
1651 int64_t max_buffer = 0;
1653 min_pos = INT64_MAX;
1655 for (i = 0; i < s->nb_streams; i++) {
1656 AVStream *st = s->streams[i];
1657 AVIStream *ast = st->priv_data;
1658 int n = st->nb_index_entries;
1659 while (idx[i] < n && st->index_entries[idx[i]].pos < pos)
1663 dts = av_rescale_q(st->index_entries[idx[i]].timestamp /
1664 FFMAX(ast->sample_size, 1),
1665 st->time_base, AV_TIME_BASE_Q);
1666 min_dts = FFMIN(min_dts, dts);
1667 min_pos = FFMIN(min_pos, st->index_entries[idx[i]].pos);
1670 for (i = 0; i < s->nb_streams; i++) {
1671 AVStream *st = s->streams[i];
1672 AVIStream *ast = st->priv_data;
1674 if (idx[i] && min_dts != INT64_MAX / 2) {
1676 dts = av_rescale_q(st->index_entries[idx[i] - 1].timestamp /
1677 FFMAX(ast->sample_size, 1),
1678 st->time_base, AV_TIME_BASE_Q);
1679 max_dts = FFMAX(max_dts, dts);
1680 max_buffer = FFMAX(max_buffer,
1681 av_rescale(dts - min_dts,
1682 st->codecpar->bit_rate,
1686 if (max_dts - min_dts > 2 * AV_TIME_BASE ||
1687 max_buffer > 1024 * 1024 * 8 * 8) {
1696 static int guess_ni_flag(AVFormatContext *s)
1699 int64_t last_start = 0;
1700 int64_t first_end = INT64_MAX;
1701 int64_t oldpos = avio_tell(s->pb);
1703 for (i = 0; i < s->nb_streams; i++) {
1704 AVStream *st = s->streams[i];
1705 int n = st->nb_index_entries;
1712 int64_t pos = st->index_entries[0].pos;
1714 avio_seek(s->pb, pos, SEEK_SET);
1715 tag[0] = avio_r8(s->pb);
1716 tag[1] = avio_r8(s->pb);
1718 size = avio_rl32(s->pb);
1719 if (get_stream_idx(tag) == i && pos + size > st->index_entries[1].pos)
1720 last_start = INT64_MAX;
1721 if (get_stream_idx(tag) == i && size == st->index_entries[0].size + 8)
1722 last_start = INT64_MAX;
1725 if (st->index_entries[0].pos > last_start)
1726 last_start = st->index_entries[0].pos;
1727 if (st->index_entries[n - 1].pos < first_end)
1728 first_end = st->index_entries[n - 1].pos;
1730 avio_seek(s->pb, oldpos, SEEK_SET);
1732 if (last_start > first_end)
1735 return check_stream_max_drift(s);
1738 static int avi_load_index(AVFormatContext *s)
1740 AVIContext *avi = s->priv_data;
1741 AVIOContext *pb = s->pb;
1743 int64_t pos = avio_tell(pb);
1747 if (avio_seek(pb, avi->movi_end, SEEK_SET) < 0)
1748 goto the_end; // maybe truncated file
1749 av_log(s, AV_LOG_TRACE, "movi_end=0x%"PRIx64"\n", avi->movi_end);
1751 tag = avio_rl32(pb);
1752 size = avio_rl32(pb);
1755 next = avio_tell(pb) + size + (size & 1);
1757 if (tag == MKTAG('i', 'd', 'x', '1') &&
1758 avi_read_idx1(s, size) >= 0) {
1759 avi->index_loaded=2;
1761 }else if (tag == MKTAG('L', 'I', 'S', 'T')) {
1762 uint32_t tag1 = avio_rl32(pb);
1764 if (tag1 == MKTAG('I', 'N', 'F', 'O'))
1765 ff_read_riff_info(s, size - 4);
1769 if (avio_seek(pb, next, SEEK_SET) < 0)
1770 break; // something is wrong here
1774 avio_seek(pb, pos, SEEK_SET);
1778 static void seek_subtitle(AVStream *st, AVStream *st2, int64_t timestamp)
1780 AVIStream *ast2 = st2->priv_data;
1781 int64_t ts2 = av_rescale_q(timestamp, st->time_base, st2->time_base);
1782 av_packet_unref(&ast2->sub_pkt);
1783 if (avformat_seek_file(ast2->sub_ctx, 0, INT64_MIN, ts2, ts2, 0) >= 0 ||
1784 avformat_seek_file(ast2->sub_ctx, 0, ts2, ts2, INT64_MAX, 0) >= 0)
1785 ff_read_packet(ast2->sub_ctx, &ast2->sub_pkt);
1788 static int avi_read_seek(AVFormatContext *s, int stream_index,
1789 int64_t timestamp, int flags)
1791 AVIContext *avi = s->priv_data;
1794 int64_t pos, pos_min;
1797 /* Does not matter which stream is requested dv in avi has the
1798 * stream information in the first video stream.
1803 if (!avi->index_loaded) {
1804 /* we only load the index on demand */
1806 avi->index_loaded |= 1;
1808 av_assert0(stream_index >= 0);
1810 st = s->streams[stream_index];
1811 ast = st->priv_data;
1812 index = av_index_search_timestamp(st,
1813 timestamp * FFMAX(ast->sample_size, 1),
1816 if (st->nb_index_entries > 0)
1817 av_log(s, AV_LOG_DEBUG, "Failed to find timestamp %"PRId64 " in index %"PRId64 " .. %"PRId64 "\n",
1818 timestamp * FFMAX(ast->sample_size, 1),
1819 st->index_entries[0].timestamp,
1820 st->index_entries[st->nb_index_entries - 1].timestamp);
1821 return AVERROR_INVALIDDATA;
1824 /* find the position */
1825 pos = st->index_entries[index].pos;
1826 timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1);
1828 av_log(s, AV_LOG_TRACE, "XX %"PRId64" %d %"PRId64"\n",
1829 timestamp, index, st->index_entries[index].timestamp);
1831 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1832 /* One and only one real stream for DV in AVI, and it has video */
1833 /* offsets. Calling with other stream indexes should have failed */
1834 /* the av_index_search_timestamp call above. */
1836 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
1839 /* Feed the DV video stream version of the timestamp to the */
1840 /* DV demux so it can synthesize correct timestamps. */
1841 ff_dv_offset_reset(avi->dv_demux, timestamp);
1843 avi->stream_index = -1;
1848 for (i = 0; i < s->nb_streams; i++) {
1849 AVStream *st2 = s->streams[i];
1850 AVIStream *ast2 = st2->priv_data;
1853 ast2->remaining = 0;
1855 if (ast2->sub_ctx) {
1856 seek_subtitle(st, st2, timestamp);
1860 if (st2->nb_index_entries <= 0)
1863 // av_assert1(st2->codecpar->block_align);
1864 index = av_index_search_timestamp(st2,
1865 av_rescale_q(timestamp,
1868 FFMAX(ast2->sample_size, 1),
1870 AVSEEK_FLAG_BACKWARD |
1871 (st2->codecpar->codec_type != AVMEDIA_TYPE_VIDEO ? AVSEEK_FLAG_ANY : 0));
1874 ast2->seek_pos = st2->index_entries[index].pos;
1875 pos_min = FFMIN(pos_min,ast2->seek_pos);
1877 for (i = 0; i < s->nb_streams; i++) {
1878 AVStream *st2 = s->streams[i];
1879 AVIStream *ast2 = st2->priv_data;
1881 if (ast2->sub_ctx || st2->nb_index_entries <= 0)
1884 index = av_index_search_timestamp(
1886 av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
1887 flags | AVSEEK_FLAG_BACKWARD | (st2->codecpar->codec_type != AVMEDIA_TYPE_VIDEO ? AVSEEK_FLAG_ANY : 0));
1890 while (!avi->non_interleaved && index>0 && st2->index_entries[index-1].pos >= pos_min)
1892 ast2->frame_offset = st2->index_entries[index].timestamp;
1896 if (avio_seek(s->pb, pos_min, SEEK_SET) < 0) {
1897 av_log(s, AV_LOG_ERROR, "Seek failed\n");
1900 avi->stream_index = -1;
1901 avi->dts_max = INT_MIN;
1905 static int avi_read_close(AVFormatContext *s)
1908 AVIContext *avi = s->priv_data;
1910 for (i = 0; i < s->nb_streams; i++) {
1911 AVStream *st = s->streams[i];
1912 AVIStream *ast = st->priv_data;
1915 av_freep(&ast->sub_ctx->pb);
1916 avformat_close_input(&ast->sub_ctx);
1918 av_freep(&ast->sub_buffer);
1919 av_packet_unref(&ast->sub_pkt);
1923 av_freep(&avi->dv_demux);
1928 static int avi_probe(const AVProbeData *p)
1932 /* check file header */
1933 for (i = 0; avi_headers[i][0]; i++)
1934 if (AV_RL32(p->buf ) == AV_RL32(avi_headers[i] ) &&
1935 AV_RL32(p->buf + 8) == AV_RL32(avi_headers[i] + 4))
1936 return AVPROBE_SCORE_MAX;
1941 AVInputFormat ff_avi_demuxer = {
1943 .long_name = NULL_IF_CONFIG_SMALL("AVI (Audio Video Interleaved)"),
1944 .priv_data_size = sizeof(AVIContext),
1945 .extensions = "avi",
1946 .read_probe = avi_probe,
1947 .read_header = avi_read_header,
1948 .read_packet = avi_read_packet,
1949 .read_close = avi_read_close,
1950 .read_seek = avi_read_seek,
1951 .priv_class = &demuxer_class,