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(str, tag, size) \
121 av_log(NULL, 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)
310 return AVERROR_INVALIDDATA;
315 return av_dict_set(st ? &st->metadata : &s->metadata, key, value,
316 AV_DICT_DONT_STRDUP_VAL);
319 static const char months[12][4] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
320 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
322 static void avi_metadata_creation_time(AVDictionary **metadata, char *date)
324 char month[4], time[9], buffer[64];
326 /* parse standard AVI date format (ie. "Mon Mar 10 15:04:43 2003") */
327 if (sscanf(date, "%*3s%*[ ]%3s%*[ ]%2d%*[ ]%8s%*[ ]%4d",
328 month, &day, time, &year) == 4) {
329 for (i = 0; i < 12; i++)
330 if (!av_strcasecmp(month, months[i])) {
331 snprintf(buffer, sizeof(buffer), "%.4d-%.2d-%.2d %s",
332 year, i + 1, day, time);
333 av_dict_set(metadata, "creation_time", buffer, 0);
335 } else if (date[4] == '/' && date[7] == '/') {
336 date[4] = date[7] = '-';
337 av_dict_set(metadata, "creation_time", date, 0);
341 static void avi_read_nikon(AVFormatContext *s, uint64_t end)
343 while (avio_tell(s->pb) < end && !avio_feof(s->pb)) {
344 uint32_t tag = avio_rl32(s->pb);
345 uint32_t size = avio_rl32(s->pb);
347 case MKTAG('n', 'c', 't', 'g'): /* Nikon Tags */
349 uint64_t tag_end = avio_tell(s->pb) + size;
350 while (avio_tell(s->pb) < tag_end && !avio_feof(s->pb)) {
351 uint16_t tag = avio_rl16(s->pb);
352 uint16_t size = avio_rl16(s->pb);
353 const char *name = NULL;
354 char buffer[64] = { 0 };
355 size = FFMIN(size, tag_end - avio_tell(s->pb));
356 size -= avio_read(s->pb, buffer,
357 FFMIN(size, sizeof(buffer) - 1));
366 name = "creation_time";
367 if (buffer[4] == ':' && buffer[7] == ':')
368 buffer[4] = buffer[7] = '-';
372 av_dict_set(&s->metadata, name, buffer, 0);
373 avio_skip(s->pb, size);
378 avio_skip(s->pb, size);
384 static int avi_extract_stream_metadata(AVFormatContext *s, AVStream *st)
387 uint8_t *data = st->codecpar->extradata;
388 int data_size = st->codecpar->extradata_size;
391 if (!data || data_size < 8) {
392 return AVERROR_INVALIDDATA;
395 bytestream2_init(&gb, data, data_size);
397 tag = bytestream2_get_le32(&gb);
400 case MKTAG('A', 'V', 'I', 'F'):
401 // skip 4 byte padding
402 bytestream2_skip(&gb, 4);
403 offset = bytestream2_tell(&gb);
405 // decode EXIF tags from IFD, AVI is always little-endian
406 return avpriv_exif_decode_ifd(s, data + offset, data_size - offset,
407 1, 0, &st->metadata);
409 case MKTAG('C', 'A', 'S', 'I'):
410 avpriv_request_sample(s, "RIFF stream data tag type CASI (%u)", tag);
412 case MKTAG('Z', 'o', 'r', 'a'):
413 avpriv_request_sample(s, "RIFF stream data tag type Zora (%u)", tag);
422 static int calculate_bitrate(AVFormatContext *s)
424 AVIContext *avi = s->priv_data;
429 for (i = 0; i<s->nb_streams; i++) {
431 AVStream *st = s->streams[i];
433 if (!st->nb_index_entries)
436 for (j = 0; j < st->nb_index_entries; j++)
437 len += st->index_entries[j].size;
438 maxpos = FFMAX(maxpos, st->index_entries[j-1].pos);
441 if (maxpos < avi->io_fsize*9/10) // index does not cover the whole file
443 if (lensum*9/10 > maxpos || lensum < maxpos*9/10) // frame sum and filesize mismatch
446 for (i = 0; i<s->nb_streams; i++) {
448 AVStream *st = s->streams[i];
452 for (j = 0; j < st->nb_index_entries; j++)
453 len += st->index_entries[j].size;
455 if (st->nb_index_entries < 2 || st->codecpar->bit_rate > 0)
457 duration = st->index_entries[j-1].timestamp - st->index_entries[0].timestamp;
458 bitrate = av_rescale(8*len, st->time_base.den, duration * st->time_base.num);
459 if (bitrate <= INT_MAX && bitrate > 0) {
460 st->codecpar->bit_rate = bitrate;
466 static int avi_read_header(AVFormatContext *s)
468 AVIContext *avi = s->priv_data;
469 AVIOContext *pb = s->pb;
470 unsigned int tag, tag1, handler;
471 int codec_type, stream_index, frame_period;
475 AVIStream *ast = NULL;
476 int avih_width = 0, avih_height = 0;
477 int amv_file_format = 0;
478 uint64_t list_end = 0;
481 AVDictionaryEntry *dict_entry;
483 avi->stream_index = -1;
485 ret = get_riff(s, pb);
489 av_log(avi, AV_LOG_DEBUG, "use odml:%d\n", avi->use_odml);
491 avi->io_fsize = avi->fsize = avio_size(pb);
492 if (avi->fsize <= 0 || avi->fsize < avi->riff_end)
493 avi->fsize = avi->riff_end == 8 ? INT64_MAX : avi->riff_end;
503 size = avio_rl32(pb);
505 print_tag("tag", tag, size);
508 case MKTAG('L', 'I', 'S', 'T'):
509 list_end = avio_tell(pb) + size;
510 /* Ignored, except at start of video packets. */
511 tag1 = avio_rl32(pb);
513 print_tag("list", tag1, 0);
515 if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
516 avi->movi_list = avio_tell(pb) - 4;
518 avi->movi_end = avi->movi_list + size + (size & 1);
520 avi->movi_end = avi->fsize;
521 av_log(NULL, AV_LOG_TRACE, "movi end=%"PRIx64"\n", avi->movi_end);
523 } else if (tag1 == MKTAG('I', 'N', 'F', 'O'))
524 ff_read_riff_info(s, size - 4);
525 else if (tag1 == MKTAG('n', 'c', 'd', 't'))
526 avi_read_nikon(s, list_end);
529 case MKTAG('I', 'D', 'I', 'T'):
531 unsigned char date[64] = { 0 };
533 size -= avio_read(pb, date, FFMIN(size, sizeof(date) - 1));
535 avi_metadata_creation_time(&s->metadata, date);
538 case MKTAG('d', 'm', 'l', 'h'):
540 avio_skip(pb, size + (size & 1));
542 case MKTAG('a', 'm', 'v', 'h'):
544 case MKTAG('a', 'v', 'i', 'h'):
546 /* using frame_period is bad idea */
547 frame_period = avio_rl32(pb);
548 avio_rl32(pb); /* max. bytes per second */
550 avi->non_interleaved |= avio_rl32(pb) & AVIF_MUSTUSEINDEX;
552 avio_skip(pb, 2 * 4);
555 avih_width = avio_rl32(pb);
556 avih_height = avio_rl32(pb);
558 avio_skip(pb, size - 10 * 4);
560 case MKTAG('s', 't', 'r', 'h'):
563 tag1 = avio_rl32(pb);
564 handler = avio_rl32(pb); /* codec tag */
566 if (tag1 == MKTAG('p', 'a', 'd', 's')) {
567 avio_skip(pb, size - 8);
571 st = avformat_new_stream(s, NULL);
575 st->id = stream_index;
576 ast = av_mallocz(sizeof(AVIStream));
582 tag1 = stream_index ? MKTAG('a', 'u', 'd', 's')
583 : MKTAG('v', 'i', 'd', 's');
585 print_tag("strh", tag1, -1);
587 if (tag1 == MKTAG('i', 'a', 'v', 's') ||
588 tag1 == MKTAG('i', 'v', 'a', 's')) {
591 /* After some consideration -- I don't think we
592 * have to support anything but DV in type1 AVIs. */
593 if (s->nb_streams != 1)
596 if (handler != MKTAG('d', 'v', 's', 'd') &&
597 handler != MKTAG('d', 'v', 'h', 'd') &&
598 handler != MKTAG('d', 'v', 's', 'l'))
601 ast = s->streams[0]->priv_data;
602 av_freep(&s->streams[0]->codecpar->extradata);
603 av_freep(&s->streams[0]->codecpar);
604 #if FF_API_LAVF_AVCTX
605 FF_DISABLE_DEPRECATION_WARNINGS
606 av_freep(&s->streams[0]->codec);
607 FF_ENABLE_DEPRECATION_WARNINGS
609 if (s->streams[0]->info)
610 av_freep(&s->streams[0]->info->duration_error);
611 av_freep(&s->streams[0]->info);
612 if (s->streams[0]->internal)
613 av_freep(&s->streams[0]->internal->avctx);
614 av_freep(&s->streams[0]->internal);
615 av_freep(&s->streams[0]);
617 if (CONFIG_DV_DEMUXER) {
618 avi->dv_demux = avpriv_dv_init_demux(s);
623 s->streams[0]->priv_data = ast;
624 avio_skip(pb, 3 * 4);
625 ast->scale = avio_rl32(pb);
626 ast->rate = avio_rl32(pb);
627 avio_skip(pb, 4); /* start time */
629 dv_dur = avio_rl32(pb);
630 if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
631 dv_dur *= AV_TIME_BASE;
632 s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
634 /* else, leave duration alone; timing estimation in utils.c
635 * will make a guess based on bitrate. */
637 stream_index = s->nb_streams - 1;
638 avio_skip(pb, size - 9 * 4);
642 av_assert0(stream_index < s->nb_streams);
643 ast->handler = handler;
645 avio_rl32(pb); /* flags */
646 avio_rl16(pb); /* priority */
647 avio_rl16(pb); /* language */
648 avio_rl32(pb); /* initial frame */
649 ast->scale = avio_rl32(pb);
650 ast->rate = avio_rl32(pb);
651 if (!(ast->scale && ast->rate)) {
652 av_log(s, AV_LOG_WARNING,
653 "scale/rate is %"PRIu32"/%"PRIu32" which is invalid. "
654 "(This file has been generated by broken software.)\n",
659 ast->scale = frame_period;
665 avpriv_set_pts_info(st, 64, ast->scale, ast->rate);
667 ast->cum_len = avio_rl32(pb); /* start */
668 st->nb_frames = avio_rl32(pb);
671 avio_rl32(pb); /* buffer size */
672 avio_rl32(pb); /* quality */
673 if (ast->cum_len*ast->scale/ast->rate > 3600) {
674 av_log(s, AV_LOG_ERROR, "crazy start time, iam scared, giving up\n");
677 ast->sample_size = avio_rl32(pb);
678 ast->cum_len *= FFMAX(1, ast->sample_size);
679 av_log(s, AV_LOG_TRACE, "%"PRIu32" %"PRIu32" %d\n",
680 ast->rate, ast->scale, ast->sample_size);
683 case MKTAG('v', 'i', 'd', 's'):
684 codec_type = AVMEDIA_TYPE_VIDEO;
686 ast->sample_size = 0;
687 st->avg_frame_rate = av_inv_q(st->time_base);
689 case MKTAG('a', 'u', 'd', 's'):
690 codec_type = AVMEDIA_TYPE_AUDIO;
692 case MKTAG('t', 'x', 't', 's'):
693 codec_type = AVMEDIA_TYPE_SUBTITLE;
695 case MKTAG('d', 'a', 't', 's'):
696 codec_type = AVMEDIA_TYPE_DATA;
699 av_log(s, AV_LOG_INFO, "unknown stream type %X\n", tag1);
702 if (ast->sample_size < 0) {
703 if (s->error_recognition & AV_EF_EXPLODE) {
704 av_log(s, AV_LOG_ERROR,
705 "Invalid sample_size %d at stream %d\n",
710 av_log(s, AV_LOG_WARNING,
711 "Invalid sample_size %d at stream %d "
715 ast->sample_size = 0;
718 if (ast->sample_size == 0) {
719 st->duration = st->nb_frames;
720 if (st->duration > 0 && avi->io_fsize > 0 && avi->riff_end > avi->io_fsize) {
721 av_log(s, AV_LOG_DEBUG, "File is truncated adjusting duration\n");
722 st->duration = av_rescale(st->duration, avi->io_fsize, avi->riff_end);
725 ast->frame_offset = ast->cum_len;
726 avio_skip(pb, size - 12 * 4);
728 case MKTAG('s', 't', 'r', 'f'):
730 if (!size && (codec_type == AVMEDIA_TYPE_AUDIO ||
731 codec_type == AVMEDIA_TYPE_VIDEO))
733 if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
736 uint64_t cur_pos = avio_tell(pb);
738 if (cur_pos < list_end)
739 size = FFMIN(size, list_end - cur_pos);
740 st = s->streams[stream_index];
741 if (st->codecpar->codec_type != AVMEDIA_TYPE_UNKNOWN) {
745 switch (codec_type) {
746 case AVMEDIA_TYPE_VIDEO:
747 if (amv_file_format) {
748 st->codecpar->width = avih_width;
749 st->codecpar->height = avih_height;
750 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
751 st->codecpar->codec_id = AV_CODEC_ID_AMV;
755 tag1 = ff_get_bmp_header(pb, st, &esize);
757 if (tag1 == MKTAG('D', 'X', 'S', 'B') ||
758 tag1 == MKTAG('D', 'X', 'S', 'A')) {
759 st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
760 st->codecpar->codec_tag = tag1;
761 st->codecpar->codec_id = AV_CODEC_ID_XSUB;
765 if (size > 10 * 4 && size < (1 << 30) && size < avi->fsize) {
766 if (esize == size-1 && (esize&1)) {
767 st->codecpar->extradata_size = esize - 10 * 4;
769 st->codecpar->extradata_size = size - 10 * 4;
770 if (st->codecpar->extradata) {
771 av_log(s, AV_LOG_WARNING, "New extradata in strf chunk, freeing previous one.\n");
772 av_freep(&st->codecpar->extradata);
774 if (ff_get_extradata(s, st->codecpar, pb, st->codecpar->extradata_size) < 0)
775 return AVERROR(ENOMEM);
778 // FIXME: check if the encoder really did this correctly
779 if (st->codecpar->extradata_size & 1)
782 /* Extract palette from extradata if bpp <= 8.
783 * This code assumes that extradata contains only palette.
784 * This is true for all paletted codecs implemented in
786 if (st->codecpar->extradata_size &&
787 (st->codecpar->bits_per_coded_sample <= 8)) {
788 int pal_size = (1 << st->codecpar->bits_per_coded_sample) << 2;
789 const uint8_t *pal_src;
791 pal_size = FFMIN(pal_size, st->codecpar->extradata_size);
792 pal_src = st->codecpar->extradata +
793 st->codecpar->extradata_size - pal_size;
794 /* Exclude the "BottomUp" field from the palette */
795 if (pal_src - st->codecpar->extradata >= 9 &&
796 !memcmp(st->codecpar->extradata + st->codecpar->extradata_size - 9, "BottomUp", 9))
798 for (i = 0; i < pal_size / 4; i++)
799 ast->pal[i] = 0xFFU<<24 | AV_RL32(pal_src + 4 * i);
803 print_tag("video", tag1, 0);
805 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
806 st->codecpar->codec_tag = tag1;
807 st->codecpar->codec_id = ff_codec_get_id(ff_codec_bmp_tags,
809 /* If codec is not found yet, try with the mov tags. */
810 if (!st->codecpar->codec_id) {
811 st->codecpar->codec_id =
812 ff_codec_get_id(ff_codec_movvideo_tags, tag1);
813 if (st->codecpar->codec_id)
814 av_log(s, AV_LOG_WARNING,
815 "mov tag found in avi (fourcc %s)\n",
816 av_fourcc2str(tag1));
818 /* This is needed to get the pict type which is necessary
819 * for generating correct pts. */
820 st->need_parsing = AVSTREAM_PARSE_HEADERS;
822 if (st->codecpar->codec_id == AV_CODEC_ID_MPEG4 &&
823 ast->handler == MKTAG('X', 'V', 'I', 'D'))
824 st->codecpar->codec_tag = MKTAG('X', 'V', 'I', 'D');
826 if (st->codecpar->codec_tag == MKTAG('V', 'S', 'S', 'H'))
827 st->need_parsing = AVSTREAM_PARSE_FULL;
828 if (st->codecpar->codec_id == AV_CODEC_ID_RV40)
829 st->need_parsing = AVSTREAM_PARSE_NONE;
831 if (st->codecpar->codec_tag == 0 && st->codecpar->height > 0 &&
832 st->codecpar->extradata_size < 1U << 30) {
833 st->codecpar->extradata_size += 9;
834 if ((ret = av_reallocp(&st->codecpar->extradata,
835 st->codecpar->extradata_size +
836 AV_INPUT_BUFFER_PADDING_SIZE)) < 0) {
837 st->codecpar->extradata_size = 0;
840 memcpy(st->codecpar->extradata + st->codecpar->extradata_size - 9,
843 st->codecpar->height = FFABS(st->codecpar->height);
845 // avio_skip(pb, size - 5 * 4);
847 case AVMEDIA_TYPE_AUDIO:
848 ret = ff_get_wav_header(s, pb, st->codecpar, size, 0);
851 ast->dshow_block_align = st->codecpar->block_align;
852 if (ast->sample_size && st->codecpar->block_align &&
853 ast->sample_size != st->codecpar->block_align) {
856 "sample size (%d) != block align (%d)\n",
858 st->codecpar->block_align);
859 ast->sample_size = st->codecpar->block_align;
862 * (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
865 /* Force parsing as several audio frames can be in
866 * one packet and timestamps refer to packet start. */
867 st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
868 /* ADTS header is in extradata, AAC without header must be
869 * stored as exact frames. Parser not needed and it will
871 if (st->codecpar->codec_id == AV_CODEC_ID_AAC &&
872 st->codecpar->extradata_size)
873 st->need_parsing = AVSTREAM_PARSE_NONE;
874 // The flac parser does not work with AVSTREAM_PARSE_TIMESTAMPS
875 if (st->codecpar->codec_id == AV_CODEC_ID_FLAC)
876 st->need_parsing = AVSTREAM_PARSE_NONE;
877 /* AVI files with Xan DPCM audio (wrongly) declare PCM
878 * audio in the header but have Axan as stream_code_tag. */
879 if (ast->handler == AV_RL32("Axan")) {
880 st->codecpar->codec_id = AV_CODEC_ID_XAN_DPCM;
881 st->codecpar->codec_tag = 0;
882 ast->dshow_block_align = 0;
884 if (amv_file_format) {
885 st->codecpar->codec_id = AV_CODEC_ID_ADPCM_IMA_AMV;
886 ast->dshow_block_align = 0;
888 if ((st->codecpar->codec_id == AV_CODEC_ID_AAC ||
889 st->codecpar->codec_id == AV_CODEC_ID_FLAC ||
890 st->codecpar->codec_id == AV_CODEC_ID_MP2 ) && ast->dshow_block_align <= 4 && ast->dshow_block_align) {
891 av_log(s, AV_LOG_DEBUG, "overriding invalid dshow_block_align of %d\n", ast->dshow_block_align);
892 ast->dshow_block_align = 0;
894 if (st->codecpar->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align == 1024 && ast->sample_size == 1024 ||
895 st->codecpar->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align == 4096 && ast->sample_size == 4096 ||
896 st->codecpar->codec_id == AV_CODEC_ID_MP3 && ast->dshow_block_align == 1152 && ast->sample_size == 1152) {
897 av_log(s, AV_LOG_DEBUG, "overriding sample_size\n");
898 ast->sample_size = 0;
901 case AVMEDIA_TYPE_SUBTITLE:
902 st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
903 st->request_probe= 1;
907 st->codecpar->codec_type = AVMEDIA_TYPE_DATA;
908 st->codecpar->codec_id = AV_CODEC_ID_NONE;
909 st->codecpar->codec_tag = 0;
915 case MKTAG('s', 't', 'r', 'd'):
916 if (stream_index >= (unsigned)s->nb_streams
917 || s->streams[stream_index]->codecpar->extradata_size
918 || s->streams[stream_index]->codecpar->codec_tag == MKTAG('H','2','6','4')) {
921 uint64_t cur_pos = avio_tell(pb);
922 if (cur_pos < list_end)
923 size = FFMIN(size, list_end - cur_pos);
924 st = s->streams[stream_index];
927 if (st->codecpar->extradata) {
928 av_log(s, AV_LOG_WARNING, "New extradata in strd chunk, freeing previous one.\n");
929 av_freep(&st->codecpar->extradata);
931 if (ff_get_extradata(s, st->codecpar, pb, size) < 0)
932 return AVERROR(ENOMEM);
935 if (st->codecpar->extradata_size & 1) //FIXME check if the encoder really did this correctly
938 ret = avi_extract_stream_metadata(s, st);
940 av_log(s, AV_LOG_WARNING, "could not decoding EXIF data in stream header.\n");
944 case MKTAG('i', 'n', 'd', 'x'):
946 if ((pb->seekable & AVIO_SEEKABLE_NORMAL) && !(s->flags & AVFMT_FLAG_IGNIDX) &&
948 read_odml_index(s, 0) < 0 &&
949 (s->error_recognition & AV_EF_EXPLODE))
951 avio_seek(pb, pos + size, SEEK_SET);
953 case MKTAG('v', 'p', 'r', 'p'):
954 if (stream_index < (unsigned)s->nb_streams && size > 9 * 4) {
955 AVRational active, active_aspect;
957 st = s->streams[stream_index];
964 active_aspect.den = avio_rl16(pb);
965 active_aspect.num = avio_rl16(pb);
966 active.num = avio_rl32(pb);
967 active.den = avio_rl32(pb);
968 avio_rl32(pb); // nbFieldsPerFrame
970 if (active_aspect.num && active_aspect.den &&
971 active.num && active.den) {
972 st->sample_aspect_ratio = av_div_q(active_aspect, active);
973 av_log(s, AV_LOG_TRACE, "vprp %d/%d %d/%d\n",
974 active_aspect.num, active_aspect.den,
975 active.num, active.den);
981 case MKTAG('s', 't', 'r', 'n'):
983 ret = avi_read_tag(s, s->streams[s->nb_streams - 1], tag, size);
989 if (size > 1000000) {
990 av_log(s, AV_LOG_ERROR,
991 "Something went wrong during header parsing, "
992 "tag %s has size %u, "
993 "I will ignore it and try to continue anyway.\n",
994 av_fourcc2str(tag), size);
995 if (s->error_recognition & AV_EF_EXPLODE)
997 avi->movi_list = avio_tell(pb) - 4;
998 avi->movi_end = avi->fsize;
1001 /* Do not fail for very large idx1 tags */
1002 case MKTAG('i', 'd', 'x', '1'):
1005 avio_skip(pb, size);
1011 /* check stream number */
1012 if (stream_index != s->nb_streams - 1) {
1015 return AVERROR_INVALIDDATA;
1018 if (!avi->index_loaded && (pb->seekable & AVIO_SEEKABLE_NORMAL))
1020 calculate_bitrate(s);
1021 avi->index_loaded |= 1;
1023 if ((ret = guess_ni_flag(s)) < 0)
1026 avi->non_interleaved |= ret | (s->flags & AVFMT_FLAG_SORT_DTS);
1028 dict_entry = av_dict_get(s->metadata, "ISFT", NULL, 0);
1029 if (dict_entry && !strcmp(dict_entry->value, "PotEncoder"))
1030 for (i = 0; i < s->nb_streams; i++) {
1031 AVStream *st = s->streams[i];
1032 if ( st->codecpar->codec_id == AV_CODEC_ID_MPEG1VIDEO
1033 || st->codecpar->codec_id == AV_CODEC_ID_MPEG2VIDEO)
1034 st->need_parsing = AVSTREAM_PARSE_FULL;
1037 for (i = 0; i < s->nb_streams; i++) {
1038 AVStream *st = s->streams[i];
1039 if (st->nb_index_entries)
1042 // DV-in-AVI cannot be non-interleaved, if set this must be
1045 avi->non_interleaved = 0;
1046 if (i == s->nb_streams && avi->non_interleaved) {
1047 av_log(s, AV_LOG_WARNING,
1048 "Non-interleaved AVI without index, switching to interleaved\n");
1049 avi->non_interleaved = 0;
1052 if (avi->non_interleaved) {
1053 av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
1057 ff_metadata_conv_ctx(s, NULL, avi_metadata_conv);
1058 ff_metadata_conv_ctx(s, NULL, ff_riff_info_conv);
1063 static int read_gab2_sub(AVFormatContext *s, AVStream *st, AVPacket *pkt)
1065 if (pkt->size >= 7 &&
1066 pkt->size < INT_MAX - AVPROBE_PADDING_SIZE &&
1067 !strcmp(pkt->data, "GAB2") && AV_RL16(pkt->data + 5) == 2) {
1069 int score = AVPROBE_SCORE_EXTENSION, ret;
1070 AVIStream *ast = st->priv_data;
1071 AVInputFormat *sub_demuxer;
1072 AVRational time_base;
1074 AVIOContext *pb = avio_alloc_context(pkt->data + 7,
1076 0, NULL, NULL, NULL, NULL);
1078 unsigned int desc_len = avio_rl32(pb);
1080 if (desc_len > pb->buf_end - pb->buf_ptr)
1083 ret = avio_get_str16le(pb, desc_len, desc, sizeof(desc));
1084 avio_skip(pb, desc_len - ret);
1086 av_dict_set(&st->metadata, "title", desc, 0);
1088 avio_rl16(pb); /* flags? */
1089 avio_rl32(pb); /* data size */
1091 size = pb->buf_end - pb->buf_ptr;
1092 pd = (AVProbeData) { .buf = av_mallocz(size + AVPROBE_PADDING_SIZE),
1096 memcpy(pd.buf, pb->buf_ptr, size);
1097 sub_demuxer = av_probe_input_format2(&pd, 1, &score);
1102 if (strcmp(sub_demuxer->name, "srt") && strcmp(sub_demuxer->name, "ass"))
1105 if (!(ast->sub_ctx = avformat_alloc_context()))
1108 ast->sub_ctx->pb = pb;
1110 if (ff_copy_whiteblacklists(ast->sub_ctx, s) < 0)
1113 if (!avformat_open_input(&ast->sub_ctx, "", sub_demuxer, NULL)) {
1114 if (ast->sub_ctx->nb_streams != 1)
1116 ff_read_packet(ast->sub_ctx, &ast->sub_pkt);
1117 avcodec_parameters_copy(st->codecpar, ast->sub_ctx->streams[0]->codecpar);
1118 time_base = ast->sub_ctx->streams[0]->time_base;
1119 avpriv_set_pts_info(st, 64, time_base.num, time_base.den);
1121 ast->sub_buffer = pkt->data;
1122 memset(pkt, 0, sizeof(*pkt));
1126 av_freep(&ast->sub_ctx);
1127 avio_context_free(&pb);
1132 static AVStream *get_subtitle_pkt(AVFormatContext *s, AVStream *next_st,
1135 AVIStream *ast, *next_ast = next_st->priv_data;
1136 int64_t ts, next_ts, ts_min = INT64_MAX;
1137 AVStream *st, *sub_st = NULL;
1140 next_ts = av_rescale_q(next_ast->frame_offset, next_st->time_base,
1143 for (i = 0; i < s->nb_streams; i++) {
1145 ast = st->priv_data;
1146 if (st->discard < AVDISCARD_ALL && ast && ast->sub_pkt.data) {
1147 ts = av_rescale_q(ast->sub_pkt.dts, st->time_base, AV_TIME_BASE_Q);
1148 if (ts <= next_ts && ts < ts_min) {
1156 ast = sub_st->priv_data;
1157 *pkt = ast->sub_pkt;
1158 pkt->stream_index = sub_st->index;
1160 if (ff_read_packet(ast->sub_ctx, &ast->sub_pkt) < 0)
1161 ast->sub_pkt.data = NULL;
1166 static int get_stream_idx(const unsigned *d)
1168 if (d[0] >= '0' && d[0] <= '9' &&
1169 d[1] >= '0' && d[1] <= '9') {
1170 return (d[0] - '0') * 10 + (d[1] - '0');
1172 return 100; // invalid stream ID
1178 * @param exit_early set to 1 to just gather packet position without making the changes needed to actually read & return the packet
1180 static int avi_sync(AVFormatContext *s, int exit_early)
1182 AVIContext *avi = s->priv_data;
1183 AVIOContext *pb = s->pb;
1190 memset(d, -1, sizeof(d));
1191 for (i = sync = avio_tell(pb); !avio_feof(pb); i++) {
1194 for (j = 0; j < 7; j++)
1198 size = d[4] + (d[5] << 8) + (d[6] << 16) + (d[7] << 24);
1200 n = get_stream_idx(d + 2);
1201 ff_tlog(s, "%X %X %X %X %X %X %X %X %"PRId64" %u %d\n",
1202 d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], i, size, n);
1203 if (i*(avi->io_fsize>0) + (uint64_t)size > avi->fsize || d[0] > 127)
1207 if ((d[0] == 'i' && d[1] == 'x' && n < s->nb_streams) ||
1209 (d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K') ||
1210 (d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1') ||
1211 (d[0] == 'i' && d[1] == 'n' && d[2] == 'd' && d[3] == 'x')) {
1212 avio_skip(pb, size);
1217 if (d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T') {
1222 n = get_stream_idx(d);
1224 if (!((i - avi->last_pkt_pos) & 1) &&
1225 get_stream_idx(d + 1) < s->nb_streams)
1228 // detect ##ix chunk and skip
1229 if (d[2] == 'i' && d[3] == 'x' && n < s->nb_streams) {
1230 avio_skip(pb, size);
1234 if (avi->dv_demux && n != 0)
1238 if (n < s->nb_streams) {
1242 ast = st->priv_data;
1245 av_log(s, AV_LOG_WARNING, "Skipping foreign stream %d packet\n", n);
1249 if (s->nb_streams >= 2) {
1250 AVStream *st1 = s->streams[1];
1251 AVIStream *ast1 = st1->priv_data;
1252 // workaround for broken small-file-bug402.avi
1253 if ( d[2] == 'w' && d[3] == 'b'
1255 && st ->codecpar->codec_type == AVMEDIA_TYPE_VIDEO
1256 && st1->codecpar->codec_type == AVMEDIA_TYPE_AUDIO
1257 && ast->prefix == 'd'*256+'c'
1258 && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
1263 av_log(s, AV_LOG_WARNING,
1264 "Invalid stream + prefix combination, assuming audio.\n");
1268 if (d[2] == 'p' && d[3] == 'c' && size <= 4 * 256 + 4) {
1269 int k = avio_r8(pb);
1270 int last = (k + avio_r8(pb) - 1) & 0xFF;
1272 avio_rl16(pb); // flags
1274 // b + (g << 8) + (r << 16);
1275 for (; k <= last; k++)
1276 ast->pal[k] = 0xFFU<<24 | avio_rb32(pb)>>8;
1280 } else if (((ast->prefix_count < 5 || sync + 9 > i) &&
1281 d[2] < 128 && d[3] < 128) ||
1282 d[2] * 256 + d[3] == ast->prefix /* ||
1283 (d[2] == 'd' && d[3] == 'c') ||
1284 (d[2] == 'w' && d[3] == 'b') */) {
1287 if (d[2] * 256 + d[3] == ast->prefix)
1288 ast->prefix_count++;
1290 ast->prefix = d[2] * 256 + d[3];
1291 ast->prefix_count = 0;
1294 if (!avi->dv_demux &&
1295 ((st->discard >= AVDISCARD_DEFAULT && size == 0) /* ||
1296 // FIXME: needs a little reordering
1297 (st->discard >= AVDISCARD_NONKEY &&
1298 !(pkt->flags & AV_PKT_FLAG_KEY)) */
1299 || st->discard >= AVDISCARD_ALL)) {
1301 ast->frame_offset += get_duration(ast, size);
1302 avio_skip(pb, size);
1306 avi->stream_index = n;
1307 ast->packet_size = size + 8;
1308 ast->remaining = size;
1311 uint64_t pos = avio_tell(pb) - 8;
1312 if (!st->index_entries || !st->nb_index_entries ||
1313 st->index_entries[st->nb_index_entries - 1].pos < pos) {
1314 av_add_index_entry(st, pos, ast->frame_offset, size,
1315 0, AVINDEX_KEYFRAME);
1328 static int ni_prepare_read(AVFormatContext *s)
1330 AVIContext *avi = s->priv_data;
1331 int best_stream_index = 0;
1332 AVStream *best_st = NULL;
1333 AVIStream *best_ast;
1334 int64_t best_ts = INT64_MAX;
1337 for (i = 0; i < s->nb_streams; i++) {
1338 AVStream *st = s->streams[i];
1339 AVIStream *ast = st->priv_data;
1340 int64_t ts = ast->frame_offset;
1343 if (!st->nb_index_entries)
1346 last_ts = st->index_entries[st->nb_index_entries - 1].timestamp;
1347 if (!ast->remaining && ts > last_ts)
1350 ts = av_rescale_q(ts, st->time_base,
1351 (AVRational) { FFMAX(1, ast->sample_size),
1354 av_log(s, AV_LOG_TRACE, "%"PRId64" %d/%d %"PRId64"\n", ts,
1355 st->time_base.num, st->time_base.den, ast->frame_offset);
1359 best_stream_index = i;
1365 best_ast = best_st->priv_data;
1366 best_ts = best_ast->frame_offset;
1367 if (best_ast->remaining) {
1368 i = av_index_search_timestamp(best_st,
1371 AVSEEK_FLAG_BACKWARD);
1373 i = av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
1375 best_ast->frame_offset = best_st->index_entries[i].timestamp;
1379 int64_t pos = best_st->index_entries[i].pos;
1380 pos += best_ast->packet_size - best_ast->remaining;
1381 if (avio_seek(s->pb, pos + 8, SEEK_SET) < 0)
1384 av_assert0(best_ast->remaining <= best_ast->packet_size);
1386 avi->stream_index = best_stream_index;
1387 if (!best_ast->remaining)
1388 best_ast->packet_size =
1389 best_ast->remaining = best_st->index_entries[i].size;
1397 static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
1399 AVIContext *avi = s->priv_data;
1400 AVIOContext *pb = s->pb;
1403 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1404 int size = avpriv_dv_get_packet(avi->dv_demux, pkt);
1411 if (avi->non_interleaved) {
1412 err = ni_prepare_read(s);
1418 if (avi->stream_index >= 0) {
1419 AVStream *st = s->streams[avi->stream_index];
1420 AVIStream *ast = st->priv_data;
1423 if (get_subtitle_pkt(s, st, pkt))
1426 // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
1427 if (ast->sample_size <= 1)
1429 else if (ast->sample_size < 32)
1430 // arbitrary multiplier to avoid tiny packets for raw PCM data
1431 size = 1024 * ast->sample_size;
1433 size = ast->sample_size;
1435 if (size > ast->remaining)
1436 size = ast->remaining;
1437 avi->last_pkt_pos = avio_tell(pb);
1438 err = av_get_packet(pb, pkt, size);
1443 if (ast->has_pal && pkt->size < (unsigned)INT_MAX / 2) {
1445 pal = av_packet_new_side_data(pkt,
1446 AV_PKT_DATA_PALETTE,
1449 av_log(s, AV_LOG_ERROR,
1450 "Failed to allocate data for palette\n");
1452 memcpy(pal, ast->pal, AVPALETTE_SIZE);
1457 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1458 AVBufferRef *avbuf = pkt->buf;
1459 size = avpriv_dv_produce_packet(avi->dv_demux, pkt,
1460 pkt->data, pkt->size, pkt->pos);
1462 pkt->flags |= AV_PKT_FLAG_KEY;
1464 av_packet_unref(pkt);
1465 } else if (st->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE &&
1466 !st->codecpar->codec_tag && read_gab2_sub(s, st, pkt)) {
1467 ast->frame_offset++;
1468 avi->stream_index = -1;
1472 /* XXX: How to handle B-frames in AVI? */
1473 pkt->dts = ast->frame_offset;
1474 // pkt->dts += ast->start;
1475 if (ast->sample_size)
1476 pkt->dts /= ast->sample_size;
1477 pkt->stream_index = avi->stream_index;
1479 if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && st->index_entries) {
1483 index = av_index_search_timestamp(st, ast->frame_offset, AVSEEK_FLAG_ANY);
1484 e = &st->index_entries[index];
1486 if (index >= 0 && e->timestamp == ast->frame_offset) {
1487 if (index == st->nb_index_entries-1) {
1490 if (st->codecpar->codec_id == AV_CODEC_ID_MPEG4) {
1491 const uint8_t *ptr = pkt->data, *end = ptr + FFMIN(size, 256);
1493 ptr = avpriv_find_start_code(ptr, end, &state);
1494 if (state == 0x1B6 && ptr < end) {
1495 key = !(*ptr & 0xC0);
1501 e->flags &= ~AVINDEX_KEYFRAME;
1503 if (e->flags & AVINDEX_KEYFRAME)
1504 pkt->flags |= AV_PKT_FLAG_KEY;
1507 pkt->flags |= AV_PKT_FLAG_KEY;
1509 ast->frame_offset += get_duration(ast, pkt->size);
1511 ast->remaining -= err;
1512 if (!ast->remaining) {
1513 avi->stream_index = -1;
1514 ast->packet_size = 0;
1517 if (!avi->non_interleaved && pkt->pos >= 0 && ast->seek_pos > pkt->pos) {
1518 av_packet_unref(pkt);
1523 if (!avi->non_interleaved && st->nb_index_entries>1 && avi->index_loaded>1) {
1524 int64_t dts= av_rescale_q(pkt->dts, st->time_base, AV_TIME_BASE_Q);
1526 if (avi->dts_max - dts > 2*AV_TIME_BASE) {
1527 avi->non_interleaved= 1;
1528 av_log(s, AV_LOG_INFO, "Switching to NI mode, due to poor interleaving\n");
1529 }else if (avi->dts_max < dts)
1536 if ((err = avi_sync(s, 0)) < 0)
1541 /* XXX: We make the implicit supposition that the positions are sorted
1542 * for each stream. */
1543 static int avi_read_idx1(AVFormatContext *s, int size)
1545 AVIContext *avi = s->priv_data;
1546 AVIOContext *pb = s->pb;
1547 int nb_index_entries, i;
1551 unsigned int index, tag, flags, len, first_packet = 1;
1552 int64_t last_pos = -1;
1553 unsigned last_idx = -1;
1554 int64_t idx1_pos, first_packet_pos = 0, data_offset = 0;
1557 nb_index_entries = size / 16;
1558 if (nb_index_entries <= 0)
1559 return AVERROR_INVALIDDATA;
1561 idx1_pos = avio_tell(pb);
1562 avio_seek(pb, avi->movi_list + 4, SEEK_SET);
1563 if (avi_sync(s, 1) == 0)
1564 first_packet_pos = avio_tell(pb) - 8;
1565 avi->stream_index = -1;
1566 avio_seek(pb, idx1_pos, SEEK_SET);
1568 if (s->nb_streams == 1 && s->streams[0]->codecpar->codec_tag == AV_RL32("MMES")) {
1569 first_packet_pos = 0;
1570 data_offset = avi->movi_list;
1573 /* Read the entries and sort them in each stream component. */
1574 for (i = 0; i < nb_index_entries; i++) {
1578 tag = avio_rl32(pb);
1579 flags = avio_rl32(pb);
1580 pos = avio_rl32(pb);
1581 len = avio_rl32(pb);
1582 av_log(s, AV_LOG_TRACE, "%d: tag=0x%x flags=0x%x pos=0x%"PRIx64" len=%d/",
1583 i, tag, flags, pos, len);
1585 index = ((tag & 0xff) - '0') * 10;
1586 index += (tag >> 8 & 0xff) - '0';
1587 if (index >= s->nb_streams)
1589 st = s->streams[index];
1590 ast = st->priv_data;
1592 /* Skip 'xxpc' palette change entries in the index until a logic
1593 * to process these is properly implemented. */
1594 if ((tag >> 16 & 0xff) == 'p' && (tag >> 24 & 0xff) == 'c')
1597 if (first_packet && first_packet_pos) {
1598 if (avi->movi_list + 4 != pos || pos + 500 > first_packet_pos)
1599 data_offset = first_packet_pos - pos;
1604 av_log(s, AV_LOG_TRACE, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
1606 // even if we have only a single stream, we should
1607 // switch to non-interleaved to get correct timestamps
1608 if (last_pos == pos)
1609 avi->non_interleaved = 1;
1610 if (last_idx != pos && len) {
1611 av_add_index_entry(st, pos, ast->cum_len, len, 0,
1612 (flags & AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
1615 ast->cum_len += get_duration(ast, len);
1617 anykey |= flags&AVIIF_INDEX;
1620 for (index = 0; index < s->nb_streams; index++) {
1621 st = s->streams[index];
1622 if (st->nb_index_entries)
1623 st->index_entries[0].flags |= AVINDEX_KEYFRAME;
1629 /* Scan the index and consider any file with streams more than
1630 * 2 seconds or 64MB apart non-interleaved. */
1631 static int check_stream_max_drift(AVFormatContext *s)
1633 int64_t min_pos, pos;
1635 int *idx = av_mallocz_array(s->nb_streams, sizeof(*idx));
1637 return AVERROR(ENOMEM);
1638 for (min_pos = pos = 0; min_pos != INT64_MAX; pos = min_pos + 1LU) {
1639 int64_t max_dts = INT64_MIN / 2;
1640 int64_t min_dts = INT64_MAX / 2;
1641 int64_t max_buffer = 0;
1643 min_pos = INT64_MAX;
1645 for (i = 0; i < s->nb_streams; i++) {
1646 AVStream *st = s->streams[i];
1647 AVIStream *ast = st->priv_data;
1648 int n = st->nb_index_entries;
1649 while (idx[i] < n && st->index_entries[idx[i]].pos < pos)
1653 dts = av_rescale_q(st->index_entries[idx[i]].timestamp /
1654 FFMAX(ast->sample_size, 1),
1655 st->time_base, AV_TIME_BASE_Q);
1656 min_dts = FFMIN(min_dts, dts);
1657 min_pos = FFMIN(min_pos, st->index_entries[idx[i]].pos);
1660 for (i = 0; i < s->nb_streams; i++) {
1661 AVStream *st = s->streams[i];
1662 AVIStream *ast = st->priv_data;
1664 if (idx[i] && min_dts != INT64_MAX / 2) {
1666 dts = av_rescale_q(st->index_entries[idx[i] - 1].timestamp /
1667 FFMAX(ast->sample_size, 1),
1668 st->time_base, AV_TIME_BASE_Q);
1669 max_dts = FFMAX(max_dts, dts);
1670 max_buffer = FFMAX(max_buffer,
1671 av_rescale(dts - min_dts,
1672 st->codecpar->bit_rate,
1676 if (max_dts - min_dts > 2 * AV_TIME_BASE ||
1677 max_buffer > 1024 * 1024 * 8 * 8) {
1686 static int guess_ni_flag(AVFormatContext *s)
1689 int64_t last_start = 0;
1690 int64_t first_end = INT64_MAX;
1691 int64_t oldpos = avio_tell(s->pb);
1693 for (i = 0; i < s->nb_streams; i++) {
1694 AVStream *st = s->streams[i];
1695 int n = st->nb_index_entries;
1702 int64_t pos = st->index_entries[0].pos;
1704 avio_seek(s->pb, pos, SEEK_SET);
1705 tag[0] = avio_r8(s->pb);
1706 tag[1] = avio_r8(s->pb);
1708 size = avio_rl32(s->pb);
1709 if (get_stream_idx(tag) == i && pos + size > st->index_entries[1].pos)
1710 last_start = INT64_MAX;
1711 if (get_stream_idx(tag) == i && size == st->index_entries[0].size + 8)
1712 last_start = INT64_MAX;
1715 if (st->index_entries[0].pos > last_start)
1716 last_start = st->index_entries[0].pos;
1717 if (st->index_entries[n - 1].pos < first_end)
1718 first_end = st->index_entries[n - 1].pos;
1720 avio_seek(s->pb, oldpos, SEEK_SET);
1722 if (last_start > first_end)
1725 return check_stream_max_drift(s);
1728 static int avi_load_index(AVFormatContext *s)
1730 AVIContext *avi = s->priv_data;
1731 AVIOContext *pb = s->pb;
1733 int64_t pos = avio_tell(pb);
1737 if (avio_seek(pb, avi->movi_end, SEEK_SET) < 0)
1738 goto the_end; // maybe truncated file
1739 av_log(s, AV_LOG_TRACE, "movi_end=0x%"PRIx64"\n", avi->movi_end);
1741 tag = avio_rl32(pb);
1742 size = avio_rl32(pb);
1745 next = avio_tell(pb) + size + (size & 1);
1747 if (tag == MKTAG('i', 'd', 'x', '1') &&
1748 avi_read_idx1(s, size) >= 0) {
1749 avi->index_loaded=2;
1751 }else if (tag == MKTAG('L', 'I', 'S', 'T')) {
1752 uint32_t tag1 = avio_rl32(pb);
1754 if (tag1 == MKTAG('I', 'N', 'F', 'O'))
1755 ff_read_riff_info(s, size - 4);
1759 if (avio_seek(pb, next, SEEK_SET) < 0)
1760 break; // something is wrong here
1764 avio_seek(pb, pos, SEEK_SET);
1768 static void seek_subtitle(AVStream *st, AVStream *st2, int64_t timestamp)
1770 AVIStream *ast2 = st2->priv_data;
1771 int64_t ts2 = av_rescale_q(timestamp, st->time_base, st2->time_base);
1772 av_packet_unref(&ast2->sub_pkt);
1773 if (avformat_seek_file(ast2->sub_ctx, 0, INT64_MIN, ts2, ts2, 0) >= 0 ||
1774 avformat_seek_file(ast2->sub_ctx, 0, ts2, ts2, INT64_MAX, 0) >= 0)
1775 ff_read_packet(ast2->sub_ctx, &ast2->sub_pkt);
1778 static int avi_read_seek(AVFormatContext *s, int stream_index,
1779 int64_t timestamp, int flags)
1781 AVIContext *avi = s->priv_data;
1784 int64_t pos, pos_min;
1787 /* Does not matter which stream is requested dv in avi has the
1788 * stream information in the first video stream.
1793 if (!avi->index_loaded) {
1794 /* we only load the index on demand */
1796 avi->index_loaded |= 1;
1798 av_assert0(stream_index >= 0);
1800 st = s->streams[stream_index];
1801 ast = st->priv_data;
1802 index = av_index_search_timestamp(st,
1803 timestamp * FFMAX(ast->sample_size, 1),
1806 if (st->nb_index_entries > 0)
1807 av_log(s, AV_LOG_DEBUG, "Failed to find timestamp %"PRId64 " in index %"PRId64 " .. %"PRId64 "\n",
1808 timestamp * FFMAX(ast->sample_size, 1),
1809 st->index_entries[0].timestamp,
1810 st->index_entries[st->nb_index_entries - 1].timestamp);
1811 return AVERROR_INVALIDDATA;
1814 /* find the position */
1815 pos = st->index_entries[index].pos;
1816 timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1);
1818 av_log(s, AV_LOG_TRACE, "XX %"PRId64" %d %"PRId64"\n",
1819 timestamp, index, st->index_entries[index].timestamp);
1821 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1822 /* One and only one real stream for DV in AVI, and it has video */
1823 /* offsets. Calling with other stream indexes should have failed */
1824 /* the av_index_search_timestamp call above. */
1826 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
1829 /* Feed the DV video stream version of the timestamp to the */
1830 /* DV demux so it can synthesize correct timestamps. */
1831 ff_dv_offset_reset(avi->dv_demux, timestamp);
1833 avi->stream_index = -1;
1838 for (i = 0; i < s->nb_streams; i++) {
1839 AVStream *st2 = s->streams[i];
1840 AVIStream *ast2 = st2->priv_data;
1843 ast2->remaining = 0;
1845 if (ast2->sub_ctx) {
1846 seek_subtitle(st, st2, timestamp);
1850 if (st2->nb_index_entries <= 0)
1853 // av_assert1(st2->codecpar->block_align);
1854 index = av_index_search_timestamp(st2,
1855 av_rescale_q(timestamp,
1858 FFMAX(ast2->sample_size, 1),
1860 AVSEEK_FLAG_BACKWARD |
1861 (st2->codecpar->codec_type != AVMEDIA_TYPE_VIDEO ? AVSEEK_FLAG_ANY : 0));
1864 ast2->seek_pos = st2->index_entries[index].pos;
1865 pos_min = FFMIN(pos_min,ast2->seek_pos);
1867 for (i = 0; i < s->nb_streams; i++) {
1868 AVStream *st2 = s->streams[i];
1869 AVIStream *ast2 = st2->priv_data;
1871 if (ast2->sub_ctx || st2->nb_index_entries <= 0)
1874 index = av_index_search_timestamp(
1876 av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
1877 flags | AVSEEK_FLAG_BACKWARD | (st2->codecpar->codec_type != AVMEDIA_TYPE_VIDEO ? AVSEEK_FLAG_ANY : 0));
1880 while (!avi->non_interleaved && index>0 && st2->index_entries[index-1].pos >= pos_min)
1882 ast2->frame_offset = st2->index_entries[index].timestamp;
1886 if (avio_seek(s->pb, pos_min, SEEK_SET) < 0) {
1887 av_log(s, AV_LOG_ERROR, "Seek failed\n");
1890 avi->stream_index = -1;
1891 avi->dts_max = INT_MIN;
1895 static int avi_read_close(AVFormatContext *s)
1898 AVIContext *avi = s->priv_data;
1900 for (i = 0; i < s->nb_streams; i++) {
1901 AVStream *st = s->streams[i];
1902 AVIStream *ast = st->priv_data;
1905 av_freep(&ast->sub_ctx->pb);
1906 avformat_close_input(&ast->sub_ctx);
1908 av_freep(&ast->sub_buffer);
1909 av_packet_unref(&ast->sub_pkt);
1913 av_freep(&avi->dv_demux);
1918 static int avi_probe(AVProbeData *p)
1922 /* check file header */
1923 for (i = 0; avi_headers[i][0]; i++)
1924 if (AV_RL32(p->buf ) == AV_RL32(avi_headers[i] ) &&
1925 AV_RL32(p->buf + 8) == AV_RL32(avi_headers[i] + 4))
1926 return AVPROBE_SCORE_MAX;
1931 AVInputFormat ff_avi_demuxer = {
1933 .long_name = NULL_IF_CONFIG_SMALL("AVI (Audio Video Interleaved)"),
1934 .priv_data_size = sizeof(AVIContext),
1935 .extensions = "avi",
1936 .read_probe = avi_probe,
1937 .read_header = avi_read_header,
1938 .read_packet = avi_read_packet,
1939 .read_close = avi_read_close,
1940 .read_seek = avi_read_seek,
1941 .priv_class = &demuxer_class,