3 * Copyright (c) 2001 Fabrice Bellard
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 #include "libavutil/avassert.h"
25 #include "libavutil/avstring.h"
26 #include "libavutil/bswap.h"
27 #include "libavutil/opt.h"
28 #include "libavutil/dict.h"
29 #include "libavutil/internal.h"
30 #include "libavutil/intreadwrite.h"
31 #include "libavutil/mathematics.h"
37 #include "libavcodec/bytestream.h"
38 #include "libavcodec/exif.h"
40 typedef struct AVIStream {
41 int64_t frame_offset; /* current frame (video) or byte (audio) counter
42 * (used to compute the pts) */
48 int sample_size; /* size of one sample (or packet)
49 * (in the rate/scale sense) in bytes */
51 int64_t cum_len; /* temporary storage (used during seek) */
52 int prefix; /* normally 'd'<<8 + 'c' or 'w'<<8 + 'b' */
56 int dshow_block_align; /* block align variable used to emulate bugs in
57 * the MS dshow demuxer */
59 AVFormatContext *sub_ctx;
78 DVDemuxContext *dv_demux;
81 #define MAX_ODML_DEPTH 1000
86 static const AVOption options[] = {
87 { "use_odml", "use odml index", offsetof(AVIContext, use_odml), AV_OPT_TYPE_INT, {.i64 = 1}, -1, 1, AV_OPT_FLAG_DECODING_PARAM},
91 static const AVClass demuxer_class = {
93 .item_name = av_default_item_name,
95 .version = LIBAVUTIL_VERSION_INT,
96 .category = AV_CLASS_CATEGORY_DEMUXER,
100 static const char avi_headers[][8] = {
101 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', ' ' },
102 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 'X' },
103 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 0x19 },
104 { 'O', 'N', '2', ' ', 'O', 'N', '2', 'f' },
105 { 'R', 'I', 'F', 'F', 'A', 'M', 'V', ' ' },
109 static const AVMetadataConv avi_metadata_conv[] = {
114 static int avi_load_index(AVFormatContext *s);
115 static int guess_ni_flag(AVFormatContext *s);
117 #define print_tag(str, tag, size) \
118 av_dlog(NULL, "pos:%"PRIX64" %s: tag=%c%c%c%c size=0x%x\n", \
119 avio_tell(pb), str, tag & 0xff, \
121 (tag >> 16) & 0xff, \
122 (tag >> 24) & 0xff, \
125 static inline int get_duration(AVIStream *ast, int len)
127 if (ast->sample_size)
129 else if (ast->dshow_block_align)
130 return (len + ast->dshow_block_align - 1) / ast->dshow_block_align;
135 static int get_riff(AVFormatContext *s, AVIOContext *pb)
137 AVIContext *avi = s->priv_data;
141 /* check RIFF header */
142 avio_read(pb, header, 4);
143 avi->riff_end = avio_rl32(pb); /* RIFF chunk size */
144 avi->riff_end += avio_tell(pb); /* RIFF chunk end */
145 avio_read(pb, header + 4, 4);
147 for (i = 0; avi_headers[i][0]; i++)
148 if (!memcmp(header, avi_headers[i], 8))
150 if (!avi_headers[i][0])
151 return AVERROR_INVALIDDATA;
153 if (header[7] == 0x19)
154 av_log(s, AV_LOG_INFO,
155 "This file has been generated by a totally broken muxer.\n");
160 static int read_braindead_odml_indx(AVFormatContext *s, int frame_num)
162 AVIContext *avi = s->priv_data;
163 AVIOContext *pb = s->pb;
164 int longs_pre_entry = avio_rl16(pb);
165 int index_sub_type = avio_r8(pb);
166 int index_type = avio_r8(pb);
167 int entries_in_use = avio_rl32(pb);
168 int chunk_id = avio_rl32(pb);
169 int64_t base = avio_rl64(pb);
170 int stream_id = ((chunk_id & 0xFF) - '0') * 10 +
171 ((chunk_id >> 8 & 0xFF) - '0');
175 int64_t last_pos = -1;
176 int64_t filesize = avi->fsize;
179 "longs_pre_entry:%d index_type:%d entries_in_use:%d "
180 "chunk_id:%X base:%16"PRIX64"\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_pre_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);
220 av_log(s, AV_LOG_ERROR, "pos:%"PRId64", len:%X\n", pos, len);
223 return AVERROR_INVALIDDATA;
225 if (last_pos == pos || pos == base - 8)
226 avi->non_interleaved = 1;
227 if (last_pos != pos && len)
228 av_add_index_entry(st, pos, ast->cum_len, len, 0,
229 key ? AVINDEX_KEYFRAME : 0);
231 ast->cum_len += get_duration(ast, len);
236 offset = avio_rl64(pb);
237 avio_rl32(pb); /* size */
238 duration = avio_rl32(pb);
241 return AVERROR_INVALIDDATA;
245 if (avi->odml_depth > MAX_ODML_DEPTH) {
246 av_log(s, AV_LOG_ERROR, "Too deeply nested ODML indexes\n");
247 return AVERROR_INVALIDDATA;
250 if (avio_seek(pb, offset + 8, SEEK_SET) < 0)
253 read_braindead_odml_indx(s, frame_num);
255 frame_num += duration;
257 if (avio_seek(pb, pos, SEEK_SET) < 0) {
258 av_log(s, AV_LOG_ERROR, "Failed to restore position after reading index\n");
264 avi->index_loaded = 2;
268 static void clean_index(AVFormatContext *s)
273 for (i = 0; i < s->nb_streams; i++) {
274 AVStream *st = s->streams[i];
275 AVIStream *ast = st->priv_data;
276 int n = st->nb_index_entries;
277 int max = ast->sample_size;
278 int64_t pos, size, ts;
280 if (n != 1 || ast->sample_size == 0)
286 pos = st->index_entries[0].pos;
287 size = st->index_entries[0].size;
288 ts = st->index_entries[0].timestamp;
290 for (j = 0; j < size; j += max)
291 av_add_index_entry(st, pos + j, ts + j, FFMIN(max, size - j), 0,
296 static int avi_read_tag(AVFormatContext *s, AVStream *st, uint32_t tag,
299 AVIOContext *pb = s->pb;
305 if (size == UINT_MAX)
306 return AVERROR(EINVAL);
307 value = av_malloc(size + 1);
309 return AVERROR(ENOMEM);
310 avio_read(pb, value, size);
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) {
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) {
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(AVStream *st)
387 uint8_t *data = st->codec->extradata;
388 int data_size = st->codec->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);
404 bytestream2_init(&gb, data + offset, data_size - offset);
406 // decode EXIF tags from IFD, AVI is always little-endian
407 return avpriv_exif_decode_ifd(st->codec, &gb, 1, 0, &st->metadata);
409 case MKTAG('C', 'A', 'S', 'I'):
410 avpriv_request_sample(st->codec, "RIFF stream data tag type CASI (%u)", tag);
412 case MKTAG('Z', 'o', 'r', 'a'):
413 avpriv_request_sample(st->codec, "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];
451 for (j = 0; j < st->nb_index_entries; j++)
452 len += st->index_entries[j].size;
454 if (st->nb_index_entries < 2 || st->codec->bit_rate > 0)
456 duration = st->index_entries[j-1].timestamp - st->index_entries[0].timestamp;
457 st->codec->bit_rate = av_rescale(8*len, st->time_base.den, duration * st->time_base.num);
462 static int avi_read_header(AVFormatContext *s)
464 AVIContext *avi = s->priv_data;
465 AVIOContext *pb = s->pb;
466 unsigned int tag, tag1, handler;
467 int codec_type, stream_index, frame_period;
471 AVIStream *ast = NULL;
472 int avih_width = 0, avih_height = 0;
473 int amv_file_format = 0;
474 uint64_t list_end = 0;
476 AVDictionaryEntry *dict_entry;
478 avi->stream_index = -1;
480 ret = get_riff(s, pb);
484 av_log(avi, AV_LOG_DEBUG, "use odml:%d\n", avi->use_odml);
486 avi->io_fsize = avi->fsize = avio_size(pb);
487 if (avi->fsize <= 0 || avi->fsize < avi->riff_end)
488 avi->fsize = avi->riff_end == 8 ? INT64_MAX : avi->riff_end;
498 size = avio_rl32(pb);
500 print_tag("tag", tag, size);
503 case MKTAG('L', 'I', 'S', 'T'):
504 list_end = avio_tell(pb) + size;
505 /* Ignored, except at start of video packets. */
506 tag1 = avio_rl32(pb);
508 print_tag("list", tag1, 0);
510 if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
511 avi->movi_list = avio_tell(pb) - 4;
513 avi->movi_end = avi->movi_list + size + (size & 1);
515 avi->movi_end = avi->fsize;
516 av_dlog(NULL, "movi end=%"PRIx64"\n", avi->movi_end);
518 } else if (tag1 == MKTAG('I', 'N', 'F', 'O'))
519 ff_read_riff_info(s, size - 4);
520 else if (tag1 == MKTAG('n', 'c', 'd', 't'))
521 avi_read_nikon(s, list_end);
524 case MKTAG('I', 'D', 'I', 'T'):
526 unsigned char date[64] = { 0 };
528 size -= avio_read(pb, date, FFMIN(size, sizeof(date) - 1));
530 avi_metadata_creation_time(&s->metadata, date);
533 case MKTAG('d', 'm', 'l', 'h'):
535 avio_skip(pb, size + (size & 1));
537 case MKTAG('a', 'm', 'v', 'h'):
539 case MKTAG('a', 'v', 'i', 'h'):
541 /* using frame_period is bad idea */
542 frame_period = avio_rl32(pb);
543 avio_rl32(pb); /* max. bytes per second */
545 avi->non_interleaved |= avio_rl32(pb) & AVIF_MUSTUSEINDEX;
547 avio_skip(pb, 2 * 4);
550 avih_width = avio_rl32(pb);
551 avih_height = avio_rl32(pb);
553 avio_skip(pb, size - 10 * 4);
555 case MKTAG('s', 't', 'r', 'h'):
558 tag1 = avio_rl32(pb);
559 handler = avio_rl32(pb); /* codec tag */
561 if (tag1 == MKTAG('p', 'a', 'd', 's')) {
562 avio_skip(pb, size - 8);
566 st = avformat_new_stream(s, NULL);
570 st->id = stream_index;
571 ast = av_mallocz(sizeof(AVIStream));
577 tag1 = stream_index ? MKTAG('a', 'u', 'd', 's')
578 : MKTAG('v', 'i', 'd', 's');
580 print_tag("strh", tag1, -1);
582 if (tag1 == MKTAG('i', 'a', 'v', 's') ||
583 tag1 == MKTAG('i', 'v', 'a', 's')) {
586 /* After some consideration -- I don't think we
587 * have to support anything but DV in type1 AVIs. */
588 if (s->nb_streams != 1)
591 if (handler != MKTAG('d', 'v', 's', 'd') &&
592 handler != MKTAG('d', 'v', 'h', 'd') &&
593 handler != MKTAG('d', 'v', 's', 'l'))
596 ast = s->streams[0]->priv_data;
597 av_freep(&s->streams[0]->codec->extradata);
598 av_freep(&s->streams[0]->codec);
599 if (s->streams[0]->info)
600 av_freep(&s->streams[0]->info->duration_error);
601 av_freep(&s->streams[0]->info);
602 av_freep(&s->streams[0]);
604 if (CONFIG_DV_DEMUXER) {
605 avi->dv_demux = avpriv_dv_init_demux(s);
610 s->streams[0]->priv_data = ast;
611 avio_skip(pb, 3 * 4);
612 ast->scale = avio_rl32(pb);
613 ast->rate = avio_rl32(pb);
614 avio_skip(pb, 4); /* start time */
616 dv_dur = avio_rl32(pb);
617 if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
618 dv_dur *= AV_TIME_BASE;
619 s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
621 /* else, leave duration alone; timing estimation in utils.c
622 * will make a guess based on bitrate. */
624 stream_index = s->nb_streams - 1;
625 avio_skip(pb, size - 9 * 4);
629 av_assert0(stream_index < s->nb_streams);
630 st->codec->stream_codec_tag = handler;
632 avio_rl32(pb); /* flags */
633 avio_rl16(pb); /* priority */
634 avio_rl16(pb); /* language */
635 avio_rl32(pb); /* initial frame */
636 ast->scale = avio_rl32(pb);
637 ast->rate = avio_rl32(pb);
638 if (!(ast->scale && ast->rate)) {
639 av_log(s, AV_LOG_WARNING,
640 "scale/rate is %"PRIu32"/%"PRIu32" which is invalid. "
641 "(This file has been generated by broken software.)\n",
646 ast->scale = frame_period;
652 avpriv_set_pts_info(st, 64, ast->scale, ast->rate);
654 ast->cum_len = avio_rl32(pb); /* start */
655 st->nb_frames = avio_rl32(pb);
658 avio_rl32(pb); /* buffer size */
659 avio_rl32(pb); /* quality */
660 if (ast->cum_len*ast->scale/ast->rate > 3600) {
661 av_log(s, AV_LOG_ERROR, "crazy start time, iam scared, giving up\n");
662 return AVERROR_INVALIDDATA;
664 ast->sample_size = avio_rl32(pb); /* sample ssize */
665 ast->cum_len *= FFMAX(1, ast->sample_size);
666 av_dlog(s, "%"PRIu32" %"PRIu32" %d\n",
667 ast->rate, ast->scale, ast->sample_size);
670 case MKTAG('v', 'i', 'd', 's'):
671 codec_type = AVMEDIA_TYPE_VIDEO;
673 ast->sample_size = 0;
674 st->avg_frame_rate = av_inv_q(st->time_base);
676 case MKTAG('a', 'u', 'd', 's'):
677 codec_type = AVMEDIA_TYPE_AUDIO;
679 case MKTAG('t', 'x', 't', 's'):
680 codec_type = AVMEDIA_TYPE_SUBTITLE;
682 case MKTAG('d', 'a', 't', 's'):
683 codec_type = AVMEDIA_TYPE_DATA;
686 av_log(s, AV_LOG_INFO, "unknown stream type %X\n", tag1);
688 if (ast->sample_size == 0) {
689 st->duration = st->nb_frames;
690 if (st->duration > 0 && avi->io_fsize > 0 && avi->riff_end > avi->io_fsize) {
691 av_log(s, AV_LOG_DEBUG, "File is truncated adjusting duration\n");
692 st->duration = av_rescale(st->duration, avi->io_fsize, avi->riff_end);
695 ast->frame_offset = ast->cum_len;
696 avio_skip(pb, size - 12 * 4);
698 case MKTAG('s', 't', 'r', 'f'):
702 if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
705 uint64_t cur_pos = avio_tell(pb);
707 if (cur_pos < list_end)
708 size = FFMIN(size, list_end - cur_pos);
709 st = s->streams[stream_index];
710 if (st->codec->codec_type != AVMEDIA_TYPE_UNKNOWN) {
714 switch (codec_type) {
715 case AVMEDIA_TYPE_VIDEO:
716 if (amv_file_format) {
717 st->codec->width = avih_width;
718 st->codec->height = avih_height;
719 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
720 st->codec->codec_id = AV_CODEC_ID_AMV;
724 tag1 = ff_get_bmp_header(pb, st, &esize);
726 if (tag1 == MKTAG('D', 'X', 'S', 'B') ||
727 tag1 == MKTAG('D', 'X', 'S', 'A')) {
728 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
729 st->codec->codec_tag = tag1;
730 st->codec->codec_id = AV_CODEC_ID_XSUB;
734 if (size > 10 * 4 && size < (1 << 30) && size < avi->fsize) {
735 if (esize == size-1 && (esize&1)) {
736 st->codec->extradata_size = esize - 10 * 4;
738 st->codec->extradata_size = size - 10 * 4;
739 if (ff_get_extradata(st->codec, pb, st->codec->extradata_size) < 0)
740 return AVERROR(ENOMEM);
743 // FIXME: check if the encoder really did this correctly
744 if (st->codec->extradata_size & 1)
747 /* Extract palette from extradata if bpp <= 8.
748 * This code assumes that extradata contains only palette.
749 * This is true for all paletted codecs implemented in
751 if (st->codec->extradata_size &&
752 (st->codec->bits_per_coded_sample <= 8)) {
753 int pal_size = (1 << st->codec->bits_per_coded_sample) << 2;
754 const uint8_t *pal_src;
756 pal_size = FFMIN(pal_size, st->codec->extradata_size);
757 pal_src = st->codec->extradata +
758 st->codec->extradata_size - pal_size;
759 /* Exclude the "BottomUp" field from the palette */
760 if (pal_src - st->codec->extradata >= 9 &&
761 !memcmp(st->codec->extradata + st->codec->extradata_size - 9, "BottomUp", 9))
763 for (i = 0; i < pal_size / 4; i++)
764 ast->pal[i] = 0xFFU<<24 | AV_RL32(pal_src+4*i);
768 print_tag("video", tag1, 0);
770 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
771 st->codec->codec_tag = tag1;
772 st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags,
774 /* This is needed to get the pict type which is necessary
775 * for generating correct pts. */
776 st->need_parsing = AVSTREAM_PARSE_HEADERS;
777 if (st->codec->codec_tag == MKTAG('V', 'S', 'S', 'H'))
778 st->need_parsing = AVSTREAM_PARSE_FULL;
780 if (st->codec->codec_tag == 0 && st->codec->height > 0 &&
781 st->codec->extradata_size < 1U << 30) {
782 st->codec->extradata_size += 9;
783 if ((ret = av_reallocp(&st->codec->extradata,
784 st->codec->extradata_size +
785 FF_INPUT_BUFFER_PADDING_SIZE)) < 0) {
786 st->codec->extradata_size = 0;
789 memcpy(st->codec->extradata + st->codec->extradata_size - 9,
792 st->codec->height = FFABS(st->codec->height);
794 // avio_skip(pb, size - 5 * 4);
796 case AVMEDIA_TYPE_AUDIO:
797 ret = ff_get_wav_header(pb, st->codec, size);
800 ast->dshow_block_align = st->codec->block_align;
801 if (ast->sample_size && st->codec->block_align &&
802 ast->sample_size != st->codec->block_align) {
805 "sample size (%d) != block align (%d)\n",
807 st->codec->block_align);
808 ast->sample_size = st->codec->block_align;
811 * (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
814 /* Force parsing as several audio frames can be in
815 * one packet and timestamps refer to packet start. */
816 st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
817 /* ADTS header is in extradata, AAC without header must be
818 * stored as exact frames. Parser not needed and it will
820 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
821 st->codec->extradata_size)
822 st->need_parsing = AVSTREAM_PARSE_NONE;
823 /* AVI files with Xan DPCM audio (wrongly) declare PCM
824 * audio in the header but have Axan as stream_code_tag. */
825 if (st->codec->stream_codec_tag == AV_RL32("Axan")) {
826 st->codec->codec_id = AV_CODEC_ID_XAN_DPCM;
827 st->codec->codec_tag = 0;
828 ast->dshow_block_align = 0;
830 if (amv_file_format) {
831 st->codec->codec_id = AV_CODEC_ID_ADPCM_IMA_AMV;
832 ast->dshow_block_align = 0;
834 if (st->codec->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align <= 4 && ast->dshow_block_align) {
835 av_log(s, AV_LOG_DEBUG, "overriding invalid dshow_block_align of %d\n", ast->dshow_block_align);
836 ast->dshow_block_align = 0;
838 if (st->codec->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align == 1024 && ast->sample_size == 1024 ||
839 st->codec->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align == 4096 && ast->sample_size == 4096 ||
840 st->codec->codec_id == AV_CODEC_ID_MP3 && ast->dshow_block_align == 1152 && ast->sample_size == 1152) {
841 av_log(s, AV_LOG_DEBUG, "overriding sample_size\n");
842 ast->sample_size = 0;
845 case AVMEDIA_TYPE_SUBTITLE:
846 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
847 st->request_probe= 1;
851 st->codec->codec_type = AVMEDIA_TYPE_DATA;
852 st->codec->codec_id = AV_CODEC_ID_NONE;
853 st->codec->codec_tag = 0;
859 case MKTAG('s', 't', 'r', 'd'):
860 if (stream_index >= (unsigned)s->nb_streams
861 || s->streams[stream_index]->codec->extradata_size
862 || s->streams[stream_index]->codec->codec_tag == MKTAG('H','2','6','4')) {
865 uint64_t cur_pos = avio_tell(pb);
866 if (cur_pos < list_end)
867 size = FFMIN(size, list_end - cur_pos);
868 st = s->streams[stream_index];
871 if (ff_get_extradata(st->codec, pb, size) < 0)
872 return AVERROR(ENOMEM);
875 if (st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
878 ret = avi_extract_stream_metadata(st);
880 av_log(s, AV_LOG_WARNING, "could not decoding EXIF data in stream header.\n");
884 case MKTAG('i', 'n', 'd', 'x'):
886 if (pb->seekable && !(s->flags & AVFMT_FLAG_IGNIDX) &&
888 read_braindead_odml_indx(s, 0) < 0 &&
889 (s->error_recognition & AV_EF_EXPLODE))
891 avio_seek(pb, i + size, SEEK_SET);
893 case MKTAG('v', 'p', 'r', 'p'):
894 if (stream_index < (unsigned)s->nb_streams && size > 9 * 4) {
895 AVRational active, active_aspect;
897 st = s->streams[stream_index];
904 active_aspect.den = avio_rl16(pb);
905 active_aspect.num = avio_rl16(pb);
906 active.num = avio_rl32(pb);
907 active.den = avio_rl32(pb);
908 avio_rl32(pb); // nbFieldsPerFrame
910 if (active_aspect.num && active_aspect.den &&
911 active.num && active.den) {
912 st->sample_aspect_ratio = av_div_q(active_aspect, active);
913 av_dlog(s, "vprp %d/%d %d/%d\n",
914 active_aspect.num, active_aspect.den,
915 active.num, active.den);
921 case MKTAG('s', 't', 'r', 'n'):
923 ret = avi_read_tag(s, s->streams[s->nb_streams - 1], tag, size);
929 if (size > 1000000) {
930 av_log(s, AV_LOG_ERROR,
931 "Something went wrong during header parsing, "
932 "I will ignore it and try to continue anyway.\n");
933 if (s->error_recognition & AV_EF_EXPLODE)
935 avi->movi_list = avio_tell(pb) - 4;
936 avi->movi_end = avi->fsize;
947 /* check stream number */
948 if (stream_index != s->nb_streams - 1) {
951 return AVERROR_INVALIDDATA;
954 if (!avi->index_loaded && pb->seekable)
956 calculate_bitrate(s);
957 avi->index_loaded |= 1;
959 if ((ret = guess_ni_flag(s)) < 0)
962 avi->non_interleaved |= ret | (s->flags & AVFMT_FLAG_SORT_DTS);
964 dict_entry = av_dict_get(s->metadata, "ISFT", NULL, 0);
965 if (dict_entry && !strcmp(dict_entry->value, "PotEncoder"))
966 for (i = 0; i < s->nb_streams; i++) {
967 AVStream *st = s->streams[i];
968 if ( st->codec->codec_id == AV_CODEC_ID_MPEG1VIDEO
969 || st->codec->codec_id == AV_CODEC_ID_MPEG2VIDEO)
970 st->need_parsing = AVSTREAM_PARSE_FULL;
973 for (i = 0; i < s->nb_streams; i++) {
974 AVStream *st = s->streams[i];
975 if (st->nb_index_entries)
978 // DV-in-AVI cannot be non-interleaved, if set this must be
981 avi->non_interleaved = 0;
982 if (i == s->nb_streams && avi->non_interleaved) {
983 av_log(s, AV_LOG_WARNING,
984 "Non-interleaved AVI without index, switching to interleaved\n");
985 avi->non_interleaved = 0;
988 if (avi->non_interleaved) {
989 av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
993 ff_metadata_conv_ctx(s, NULL, avi_metadata_conv);
994 ff_metadata_conv_ctx(s, NULL, ff_riff_info_conv);
999 static int read_gab2_sub(AVStream *st, AVPacket *pkt)
1001 if (pkt->size >= 7 &&
1002 pkt->size < INT_MAX - AVPROBE_PADDING_SIZE &&
1003 !strcmp(pkt->data, "GAB2") && AV_RL16(pkt->data + 5) == 2) {
1005 int score = AVPROBE_SCORE_EXTENSION, ret;
1006 AVIStream *ast = st->priv_data;
1007 AVInputFormat *sub_demuxer;
1008 AVRational time_base;
1010 AVIOContext *pb = avio_alloc_context(pkt->data + 7,
1012 0, NULL, NULL, NULL, NULL);
1014 unsigned int desc_len = avio_rl32(pb);
1016 if (desc_len > pb->buf_end - pb->buf_ptr)
1019 ret = avio_get_str16le(pb, desc_len, desc, sizeof(desc));
1020 avio_skip(pb, desc_len - ret);
1022 av_dict_set(&st->metadata, "title", desc, 0);
1024 avio_rl16(pb); /* flags? */
1025 avio_rl32(pb); /* data size */
1027 size = pb->buf_end - pb->buf_ptr;
1028 pd = (AVProbeData) { .buf = av_mallocz(size + AVPROBE_PADDING_SIZE),
1032 memcpy(pd.buf, pb->buf_ptr, size);
1033 sub_demuxer = av_probe_input_format2(&pd, 1, &score);
1038 if (!(ast->sub_ctx = avformat_alloc_context()))
1041 ast->sub_ctx->pb = pb;
1042 if (!avformat_open_input(&ast->sub_ctx, "", sub_demuxer, NULL)) {
1043 ff_read_packet(ast->sub_ctx, &ast->sub_pkt);
1044 *st->codec = *ast->sub_ctx->streams[0]->codec;
1045 ast->sub_ctx->streams[0]->codec->extradata = NULL;
1046 time_base = ast->sub_ctx->streams[0]->time_base;
1047 avpriv_set_pts_info(st, 64, time_base.num, time_base.den);
1049 ast->sub_buffer = pkt->data;
1050 memset(pkt, 0, sizeof(*pkt));
1059 static AVStream *get_subtitle_pkt(AVFormatContext *s, AVStream *next_st,
1062 AVIStream *ast, *next_ast = next_st->priv_data;
1063 int64_t ts, next_ts, ts_min = INT64_MAX;
1064 AVStream *st, *sub_st = NULL;
1067 next_ts = av_rescale_q(next_ast->frame_offset, next_st->time_base,
1070 for (i = 0; i < s->nb_streams; i++) {
1072 ast = st->priv_data;
1073 if (st->discard < AVDISCARD_ALL && ast && ast->sub_pkt.data) {
1074 ts = av_rescale_q(ast->sub_pkt.dts, st->time_base, AV_TIME_BASE_Q);
1075 if (ts <= next_ts && ts < ts_min) {
1083 ast = sub_st->priv_data;
1084 *pkt = ast->sub_pkt;
1085 pkt->stream_index = sub_st->index;
1087 if (ff_read_packet(ast->sub_ctx, &ast->sub_pkt) < 0)
1088 ast->sub_pkt.data = NULL;
1093 static int get_stream_idx(const unsigned *d)
1095 if (d[0] >= '0' && d[0] <= '9' &&
1096 d[1] >= '0' && d[1] <= '9') {
1097 return (d[0] - '0') * 10 + (d[1] - '0');
1099 return 100; // invalid stream ID
1105 * @param exit_early set to 1 to just gather packet position without making the changes needed to actually read & return the packet
1107 static int avi_sync(AVFormatContext *s, int exit_early)
1109 AVIContext *avi = s->priv_data;
1110 AVIOContext *pb = s->pb;
1117 memset(d, -1, sizeof(d));
1118 for (i = sync = avio_tell(pb); !avio_feof(pb); i++) {
1121 for (j = 0; j < 7; j++)
1125 size = d[4] + (d[5] << 8) + (d[6] << 16) + (d[7] << 24);
1127 n = get_stream_idx(d + 2);
1128 av_dlog(s, "%X %X %X %X %X %X %X %X %"PRId64" %u %d\n",
1129 d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], i, size, n);
1130 if (i*(avi->io_fsize>0) + (uint64_t)size > avi->fsize || d[0] > 127)
1134 if ((d[0] == 'i' && d[1] == 'x' && n < s->nb_streams) ||
1136 (d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K') ||
1137 (d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')) {
1138 avio_skip(pb, size);
1143 if (d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T') {
1148 n = avi->dv_demux ? 0 : get_stream_idx(d);
1150 if (!((i - avi->last_pkt_pos) & 1) &&
1151 get_stream_idx(d + 1) < s->nb_streams)
1154 // detect ##ix chunk and skip
1155 if (d[2] == 'i' && d[3] == 'x' && n < s->nb_streams) {
1156 avio_skip(pb, size);
1161 if (n < s->nb_streams) {
1165 ast = st->priv_data;
1168 av_log(s, AV_LOG_WARNING, "Skipping foreign stream %d packet\n", n);
1172 if (s->nb_streams >= 2) {
1173 AVStream *st1 = s->streams[1];
1174 AVIStream *ast1 = st1->priv_data;
1175 // workaround for broken small-file-bug402.avi
1176 if ( d[2] == 'w' && d[3] == 'b'
1178 && st ->codec->codec_type == AVMEDIA_TYPE_VIDEO
1179 && st1->codec->codec_type == AVMEDIA_TYPE_AUDIO
1180 && ast->prefix == 'd'*256+'c'
1181 && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
1186 av_log(s, AV_LOG_WARNING,
1187 "Invalid stream + prefix combination, assuming audio.\n");
1191 if (!avi->dv_demux &&
1192 ((st->discard >= AVDISCARD_DEFAULT && size == 0) /* ||
1193 // FIXME: needs a little reordering
1194 (st->discard >= AVDISCARD_NONKEY &&
1195 !(pkt->flags & AV_PKT_FLAG_KEY)) */
1196 || st->discard >= AVDISCARD_ALL)) {
1198 ast->frame_offset += get_duration(ast, size);
1199 avio_skip(pb, size);
1204 if (d[2] == 'p' && d[3] == 'c' && size <= 4 * 256 + 4) {
1205 int k = avio_r8(pb);
1206 int last = (k + avio_r8(pb) - 1) & 0xFF;
1208 avio_rl16(pb); // flags
1210 // b + (g << 8) + (r << 16);
1211 for (; k <= last; k++)
1212 ast->pal[k] = 0xFFU<<24 | avio_rb32(pb)>>8;
1216 } else if (((ast->prefix_count < 5 || sync + 9 > i) &&
1217 d[2] < 128 && d[3] < 128) ||
1218 d[2] * 256 + d[3] == ast->prefix /* ||
1219 (d[2] == 'd' && d[3] == 'c') ||
1220 (d[2] == 'w' && d[3] == 'b') */) {
1223 if (d[2] * 256 + d[3] == ast->prefix)
1224 ast->prefix_count++;
1226 ast->prefix = d[2] * 256 + d[3];
1227 ast->prefix_count = 0;
1230 avi->stream_index = n;
1231 ast->packet_size = size + 8;
1232 ast->remaining = size;
1235 uint64_t pos = avio_tell(pb) - 8;
1236 if (!st->index_entries || !st->nb_index_entries ||
1237 st->index_entries[st->nb_index_entries - 1].pos < pos) {
1238 av_add_index_entry(st, pos, ast->frame_offset, size,
1239 0, AVINDEX_KEYFRAME);
1252 static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
1254 AVIContext *avi = s->priv_data;
1255 AVIOContext *pb = s->pb;
1257 #if FF_API_DESTRUCT_PACKET
1261 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1262 int size = avpriv_dv_get_packet(avi->dv_demux, pkt);
1269 if (avi->non_interleaved) {
1270 int best_stream_index = 0;
1271 AVStream *best_st = NULL;
1272 AVIStream *best_ast;
1273 int64_t best_ts = INT64_MAX;
1276 for (i = 0; i < s->nb_streams; i++) {
1277 AVStream *st = s->streams[i];
1278 AVIStream *ast = st->priv_data;
1279 int64_t ts = ast->frame_offset;
1282 if (!st->nb_index_entries)
1285 last_ts = st->index_entries[st->nb_index_entries - 1].timestamp;
1286 if (!ast->remaining && ts > last_ts)
1289 ts = av_rescale_q(ts, st->time_base,
1290 (AVRational) { FFMAX(1, ast->sample_size),
1293 av_dlog(s, "%"PRId64" %d/%d %"PRId64"\n", ts,
1294 st->time_base.num, st->time_base.den, ast->frame_offset);
1298 best_stream_index = i;
1304 best_ast = best_st->priv_data;
1305 best_ts = best_ast->frame_offset;
1306 if (best_ast->remaining) {
1307 i = av_index_search_timestamp(best_st,
1310 AVSEEK_FLAG_BACKWARD);
1312 i = av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
1314 best_ast->frame_offset = best_st->index_entries[i].timestamp;
1318 int64_t pos = best_st->index_entries[i].pos;
1319 pos += best_ast->packet_size - best_ast->remaining;
1320 if (avio_seek(s->pb, pos + 8, SEEK_SET) < 0)
1323 av_assert0(best_ast->remaining <= best_ast->packet_size);
1325 avi->stream_index = best_stream_index;
1326 if (!best_ast->remaining)
1327 best_ast->packet_size =
1328 best_ast->remaining = best_st->index_entries[i].size;
1335 if (avi->stream_index >= 0) {
1336 AVStream *st = s->streams[avi->stream_index];
1337 AVIStream *ast = st->priv_data;
1340 if (get_subtitle_pkt(s, st, pkt))
1343 // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
1344 if (ast->sample_size <= 1)
1346 else if (ast->sample_size < 32)
1347 // arbitrary multiplier to avoid tiny packets for raw PCM data
1348 size = 1024 * ast->sample_size;
1350 size = ast->sample_size;
1352 if (size > ast->remaining)
1353 size = ast->remaining;
1354 avi->last_pkt_pos = avio_tell(pb);
1355 err = av_get_packet(pb, pkt, size);
1360 if (ast->has_pal && pkt->size < (unsigned)INT_MAX / 2) {
1362 pal = av_packet_new_side_data(pkt,
1363 AV_PKT_DATA_PALETTE,
1366 av_log(s, AV_LOG_ERROR,
1367 "Failed to allocate data for palette\n");
1369 memcpy(pal, ast->pal, AVPALETTE_SIZE);
1374 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1375 AVBufferRef *avbuf = pkt->buf;
1376 #if FF_API_DESTRUCT_PACKET
1377 FF_DISABLE_DEPRECATION_WARNINGS
1378 dstr = pkt->destruct;
1379 FF_ENABLE_DEPRECATION_WARNINGS
1381 size = avpriv_dv_produce_packet(avi->dv_demux, pkt,
1382 pkt->data, pkt->size, pkt->pos);
1383 #if FF_API_DESTRUCT_PACKET
1384 FF_DISABLE_DEPRECATION_WARNINGS
1385 pkt->destruct = dstr;
1386 FF_ENABLE_DEPRECATION_WARNINGS
1389 pkt->flags |= AV_PKT_FLAG_KEY;
1391 av_free_packet(pkt);
1392 } else if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE &&
1393 !st->codec->codec_tag && read_gab2_sub(st, pkt)) {
1394 ast->frame_offset++;
1395 avi->stream_index = -1;
1399 /* XXX: How to handle B-frames in AVI? */
1400 pkt->dts = ast->frame_offset;
1401 // pkt->dts += ast->start;
1402 if (ast->sample_size)
1403 pkt->dts /= ast->sample_size;
1405 "dts:%"PRId64" offset:%"PRId64" %d/%d smpl_siz:%d "
1406 "base:%d st:%d size:%d\n",
1415 pkt->stream_index = avi->stream_index;
1417 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && st->index_entries) {
1421 index = av_index_search_timestamp(st, ast->frame_offset, AVSEEK_FLAG_ANY);
1422 e = &st->index_entries[index];
1424 if (index >= 0 && e->timestamp == ast->frame_offset) {
1425 if (index == st->nb_index_entries-1) {
1429 for (i=0; i<FFMIN(size,256); i++) {
1430 if (st->codec->codec_id == AV_CODEC_ID_MPEG4) {
1431 if (state == 0x1B6) {
1432 key= !(pkt->data[i]&0xC0);
1437 state= (state<<8) + pkt->data[i];
1440 e->flags &= ~AVINDEX_KEYFRAME;
1442 if (e->flags & AVINDEX_KEYFRAME)
1443 pkt->flags |= AV_PKT_FLAG_KEY;
1446 pkt->flags |= AV_PKT_FLAG_KEY;
1448 ast->frame_offset += get_duration(ast, pkt->size);
1450 ast->remaining -= err;
1451 if (!ast->remaining) {
1452 avi->stream_index = -1;
1453 ast->packet_size = 0;
1456 if (!avi->non_interleaved && pkt->pos >= 0 && ast->seek_pos > pkt->pos) {
1457 av_free_packet(pkt);
1462 if (!avi->non_interleaved && st->nb_index_entries>1 && avi->index_loaded>1) {
1463 int64_t dts= av_rescale_q(pkt->dts, st->time_base, AV_TIME_BASE_Q);
1465 if (avi->dts_max - dts > 2*AV_TIME_BASE) {
1466 avi->non_interleaved= 1;
1467 av_log(s, AV_LOG_INFO, "Switching to NI mode, due to poor interleaving\n");
1468 }else if (avi->dts_max < dts)
1475 if ((err = avi_sync(s, 0)) < 0)
1480 /* XXX: We make the implicit supposition that the positions are sorted
1481 * for each stream. */
1482 static int avi_read_idx1(AVFormatContext *s, int size)
1484 AVIContext *avi = s->priv_data;
1485 AVIOContext *pb = s->pb;
1486 int nb_index_entries, i;
1489 unsigned int index, tag, flags, pos, len, first_packet = 1;
1490 unsigned last_pos = -1;
1491 unsigned last_idx = -1;
1492 int64_t idx1_pos, first_packet_pos = 0, data_offset = 0;
1495 nb_index_entries = size / 16;
1496 if (nb_index_entries <= 0)
1497 return AVERROR_INVALIDDATA;
1499 idx1_pos = avio_tell(pb);
1500 avio_seek(pb, avi->movi_list + 4, SEEK_SET);
1501 if (avi_sync(s, 1) == 0)
1502 first_packet_pos = avio_tell(pb) - 8;
1503 avi->stream_index = -1;
1504 avio_seek(pb, idx1_pos, SEEK_SET);
1506 if (s->nb_streams == 1 && s->streams[0]->codec->codec_tag == AV_RL32("MMES")) {
1507 first_packet_pos = 0;
1508 data_offset = avi->movi_list;
1511 /* Read the entries and sort them in each stream component. */
1512 for (i = 0; i < nb_index_entries; i++) {
1516 tag = avio_rl32(pb);
1517 flags = avio_rl32(pb);
1518 pos = avio_rl32(pb);
1519 len = avio_rl32(pb);
1520 av_dlog(s, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
1521 i, tag, flags, pos, len);
1523 index = ((tag & 0xff) - '0') * 10;
1524 index += (tag >> 8 & 0xff) - '0';
1525 if (index >= s->nb_streams)
1527 st = s->streams[index];
1528 ast = st->priv_data;
1530 if (first_packet && first_packet_pos) {
1531 data_offset = first_packet_pos - pos;
1536 av_dlog(s, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
1538 // even if we have only a single stream, we should
1539 // switch to non-interleaved to get correct timestamps
1540 if (last_pos == pos)
1541 avi->non_interleaved = 1;
1542 if (last_idx != pos && len) {
1543 av_add_index_entry(st, pos, ast->cum_len, len, 0,
1544 (flags & AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
1547 ast->cum_len += get_duration(ast, len);
1549 anykey |= flags&AVIIF_INDEX;
1552 for (index = 0; index < s->nb_streams; index++) {
1553 st = s->streams[index];
1554 if (st->nb_index_entries)
1555 st->index_entries[0].flags |= AVINDEX_KEYFRAME;
1561 /* Scan the index and consider any file with streams more than
1562 * 2 seconds or 64MB apart non-interleaved. */
1563 static int check_stream_max_drift(AVFormatContext *s)
1565 int64_t min_pos, pos;
1567 int *idx = av_mallocz_array(s->nb_streams, sizeof(*idx));
1569 return AVERROR(ENOMEM);
1570 for (min_pos = pos = 0; min_pos != INT64_MAX; pos = min_pos + 1LU) {
1571 int64_t max_dts = INT64_MIN / 2;
1572 int64_t min_dts = INT64_MAX / 2;
1573 int64_t max_buffer = 0;
1575 min_pos = INT64_MAX;
1577 for (i = 0; i < s->nb_streams; i++) {
1578 AVStream *st = s->streams[i];
1579 AVIStream *ast = st->priv_data;
1580 int n = st->nb_index_entries;
1581 while (idx[i] < n && st->index_entries[idx[i]].pos < pos)
1585 dts = av_rescale_q(st->index_entries[idx[i]].timestamp /
1586 FFMAX(ast->sample_size, 1),
1587 st->time_base, AV_TIME_BASE_Q);
1588 min_dts = FFMIN(min_dts, dts);
1589 min_pos = FFMIN(min_pos, st->index_entries[idx[i]].pos);
1592 for (i = 0; i < s->nb_streams; i++) {
1593 AVStream *st = s->streams[i];
1594 AVIStream *ast = st->priv_data;
1596 if (idx[i] && min_dts != INT64_MAX / 2) {
1598 dts = av_rescale_q(st->index_entries[idx[i] - 1].timestamp /
1599 FFMAX(ast->sample_size, 1),
1600 st->time_base, AV_TIME_BASE_Q);
1601 max_dts = FFMAX(max_dts, dts);
1602 max_buffer = FFMAX(max_buffer,
1603 av_rescale(dts - min_dts,
1604 st->codec->bit_rate,
1608 if (max_dts - min_dts > 2 * AV_TIME_BASE ||
1609 max_buffer > 1024 * 1024 * 8 * 8) {
1618 static int guess_ni_flag(AVFormatContext *s)
1621 int64_t last_start = 0;
1622 int64_t first_end = INT64_MAX;
1623 int64_t oldpos = avio_tell(s->pb);
1625 for (i = 0; i < s->nb_streams; i++) {
1626 AVStream *st = s->streams[i];
1627 int n = st->nb_index_entries;
1634 int64_t pos = st->index_entries[0].pos;
1635 avio_seek(s->pb, pos + 4, SEEK_SET);
1636 size = avio_rl32(s->pb);
1637 if (pos + size > st->index_entries[1].pos)
1638 last_start = INT64_MAX;
1641 if (st->index_entries[0].pos > last_start)
1642 last_start = st->index_entries[0].pos;
1643 if (st->index_entries[n - 1].pos < first_end)
1644 first_end = st->index_entries[n - 1].pos;
1646 avio_seek(s->pb, oldpos, SEEK_SET);
1648 if (last_start > first_end)
1651 return check_stream_max_drift(s);
1654 static int avi_load_index(AVFormatContext *s)
1656 AVIContext *avi = s->priv_data;
1657 AVIOContext *pb = s->pb;
1659 int64_t pos = avio_tell(pb);
1663 if (avio_seek(pb, avi->movi_end, SEEK_SET) < 0)
1664 goto the_end; // maybe truncated file
1665 av_dlog(s, "movi_end=0x%"PRIx64"\n", avi->movi_end);
1667 tag = avio_rl32(pb);
1668 size = avio_rl32(pb);
1671 next = avio_tell(pb) + size + (size & 1);
1673 av_dlog(s, "tag=%c%c%c%c size=0x%x\n",
1680 if (tag == MKTAG('i', 'd', 'x', '1') &&
1681 avi_read_idx1(s, size) >= 0) {
1682 avi->index_loaded=2;
1684 }else if (tag == MKTAG('L', 'I', 'S', 'T')) {
1685 uint32_t tag1 = avio_rl32(pb);
1687 if (tag1 == MKTAG('I', 'N', 'F', 'O'))
1688 ff_read_riff_info(s, size - 4);
1692 if (avio_seek(pb, next, SEEK_SET) < 0)
1693 break; // something is wrong here
1697 avio_seek(pb, pos, SEEK_SET);
1701 static void seek_subtitle(AVStream *st, AVStream *st2, int64_t timestamp)
1703 AVIStream *ast2 = st2->priv_data;
1704 int64_t ts2 = av_rescale_q(timestamp, st->time_base, st2->time_base);
1705 av_free_packet(&ast2->sub_pkt);
1706 if (avformat_seek_file(ast2->sub_ctx, 0, INT64_MIN, ts2, ts2, 0) >= 0 ||
1707 avformat_seek_file(ast2->sub_ctx, 0, ts2, ts2, INT64_MAX, 0) >= 0)
1708 ff_read_packet(ast2->sub_ctx, &ast2->sub_pkt);
1711 static int avi_read_seek(AVFormatContext *s, int stream_index,
1712 int64_t timestamp, int flags)
1714 AVIContext *avi = s->priv_data;
1717 int64_t pos, pos_min;
1720 /* Does not matter which stream is requested dv in avi has the
1721 * stream information in the first video stream.
1726 if (!avi->index_loaded) {
1727 /* we only load the index on demand */
1729 avi->index_loaded |= 1;
1731 av_assert0(stream_index >= 0);
1733 st = s->streams[stream_index];
1734 ast = st->priv_data;
1735 index = av_index_search_timestamp(st,
1736 timestamp * FFMAX(ast->sample_size, 1),
1739 if (st->nb_index_entries > 0)
1740 av_log(s, AV_LOG_DEBUG, "Failed to find timestamp %"PRId64 " in index %"PRId64 " .. %"PRId64 "\n",
1741 timestamp * FFMAX(ast->sample_size, 1),
1742 st->index_entries[0].timestamp,
1743 st->index_entries[st->nb_index_entries - 1].timestamp);
1744 return AVERROR_INVALIDDATA;
1747 /* find the position */
1748 pos = st->index_entries[index].pos;
1749 timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1);
1751 av_dlog(s, "XX %"PRId64" %d %"PRId64"\n",
1752 timestamp, index, st->index_entries[index].timestamp);
1754 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1755 /* One and only one real stream for DV in AVI, and it has video */
1756 /* offsets. Calling with other stream indexes should have failed */
1757 /* the av_index_search_timestamp call above. */
1759 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
1762 /* Feed the DV video stream version of the timestamp to the */
1763 /* DV demux so it can synthesize correct timestamps. */
1764 ff_dv_offset_reset(avi->dv_demux, timestamp);
1766 avi->stream_index = -1;
1771 for (i = 0; i < s->nb_streams; i++) {
1772 AVStream *st2 = s->streams[i];
1773 AVIStream *ast2 = st2->priv_data;
1776 ast2->remaining = 0;
1778 if (ast2->sub_ctx) {
1779 seek_subtitle(st, st2, timestamp);
1783 if (st2->nb_index_entries <= 0)
1786 // av_assert1(st2->codec->block_align);
1787 av_assert0(fabs(av_q2d(st2->time_base) - ast2->scale / (double)ast2->rate) < av_q2d(st2->time_base) * 0.00000001);
1788 index = av_index_search_timestamp(st2,
1789 av_rescale_q(timestamp,
1792 FFMAX(ast2->sample_size, 1),
1794 AVSEEK_FLAG_BACKWARD |
1795 (st2->codec->codec_type != AVMEDIA_TYPE_VIDEO ? AVSEEK_FLAG_ANY : 0));
1798 ast2->seek_pos = st2->index_entries[index].pos;
1799 pos_min = FFMIN(pos_min,ast2->seek_pos);
1801 for (i = 0; i < s->nb_streams; i++) {
1802 AVStream *st2 = s->streams[i];
1803 AVIStream *ast2 = st2->priv_data;
1805 if (ast2->sub_ctx || st2->nb_index_entries <= 0)
1808 index = av_index_search_timestamp(
1810 av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
1811 flags | AVSEEK_FLAG_BACKWARD | (st2->codec->codec_type != AVMEDIA_TYPE_VIDEO ? AVSEEK_FLAG_ANY : 0));
1814 while (!avi->non_interleaved && index>0 && st2->index_entries[index-1].pos >= pos_min)
1816 ast2->frame_offset = st2->index_entries[index].timestamp;
1820 if (avio_seek(s->pb, pos_min, SEEK_SET) < 0) {
1821 av_log(s, AV_LOG_ERROR, "Seek failed\n");
1824 avi->stream_index = -1;
1825 avi->dts_max = INT_MIN;
1829 static int avi_read_close(AVFormatContext *s)
1832 AVIContext *avi = s->priv_data;
1834 for (i = 0; i < s->nb_streams; i++) {
1835 AVStream *st = s->streams[i];
1836 AVIStream *ast = st->priv_data;
1839 av_freep(&ast->sub_ctx->pb);
1840 avformat_close_input(&ast->sub_ctx);
1842 av_free(ast->sub_buffer);
1843 av_free_packet(&ast->sub_pkt);
1847 av_free(avi->dv_demux);
1852 static int avi_probe(AVProbeData *p)
1856 /* check file header */
1857 for (i = 0; avi_headers[i][0]; i++)
1858 if (!memcmp(p->buf, avi_headers[i], 4) &&
1859 !memcmp(p->buf + 8, avi_headers[i] + 4, 4))
1860 return AVPROBE_SCORE_MAX;
1865 AVInputFormat ff_avi_demuxer = {
1867 .long_name = NULL_IF_CONFIG_SMALL("AVI (Audio Video Interleaved)"),
1868 .priv_data_size = sizeof(AVIContext),
1869 .extensions = "avi",
1870 .read_probe = avi_probe,
1871 .read_header = avi_read_header,
1872 .read_packet = avi_read_packet,
1873 .read_close = avi_read_close,
1874 .read_seek = avi_read_seek,
1875 .priv_class = &demuxer_class,