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);
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(s, &gb, 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'):
732 if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
735 uint64_t cur_pos = avio_tell(pb);
737 if (cur_pos < list_end)
738 size = FFMIN(size, list_end - cur_pos);
739 st = s->streams[stream_index];
740 if (st->codecpar->codec_type != AVMEDIA_TYPE_UNKNOWN) {
744 switch (codec_type) {
745 case AVMEDIA_TYPE_VIDEO:
746 if (amv_file_format) {
747 st->codecpar->width = avih_width;
748 st->codecpar->height = avih_height;
749 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
750 st->codecpar->codec_id = AV_CODEC_ID_AMV;
754 tag1 = ff_get_bmp_header(pb, st, &esize);
756 if (tag1 == MKTAG('D', 'X', 'S', 'B') ||
757 tag1 == MKTAG('D', 'X', 'S', 'A')) {
758 st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
759 st->codecpar->codec_tag = tag1;
760 st->codecpar->codec_id = AV_CODEC_ID_XSUB;
764 if (size > 10 * 4 && size < (1 << 30) && size < avi->fsize) {
765 if (esize == size-1 && (esize&1)) {
766 st->codecpar->extradata_size = esize - 10 * 4;
768 st->codecpar->extradata_size = size - 10 * 4;
769 if (st->codecpar->extradata) {
770 av_log(s, AV_LOG_WARNING, "New extradata in strf chunk, freeing previous one.\n");
771 av_freep(&st->codecpar->extradata);
773 if (ff_get_extradata(s, st->codecpar, pb, st->codecpar->extradata_size) < 0)
774 return AVERROR(ENOMEM);
777 // FIXME: check if the encoder really did this correctly
778 if (st->codecpar->extradata_size & 1)
781 /* Extract palette from extradata if bpp <= 8.
782 * This code assumes that extradata contains only palette.
783 * This is true for all paletted codecs implemented in
785 if (st->codecpar->extradata_size &&
786 (st->codecpar->bits_per_coded_sample <= 8)) {
787 int pal_size = (1 << st->codecpar->bits_per_coded_sample) << 2;
788 const uint8_t *pal_src;
790 pal_size = FFMIN(pal_size, st->codecpar->extradata_size);
791 pal_src = st->codecpar->extradata +
792 st->codecpar->extradata_size - pal_size;
793 /* Exclude the "BottomUp" field from the palette */
794 if (pal_src - st->codecpar->extradata >= 9 &&
795 !memcmp(st->codecpar->extradata + st->codecpar->extradata_size - 9, "BottomUp", 9))
797 for (i = 0; i < pal_size / 4; i++)
798 ast->pal[i] = 0xFFU<<24 | AV_RL32(pal_src + 4 * i);
802 print_tag("video", tag1, 0);
804 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
805 st->codecpar->codec_tag = tag1;
806 st->codecpar->codec_id = ff_codec_get_id(ff_codec_bmp_tags,
808 /* If codec is not found yet, try with the mov tags. */
809 if (!st->codecpar->codec_id) {
810 st->codecpar->codec_id =
811 ff_codec_get_id(ff_codec_movvideo_tags, tag1);
812 if (st->codecpar->codec_id)
813 av_log(s, AV_LOG_WARNING,
814 "mov tag found in avi (fourcc %s)\n",
815 av_fourcc2str(tag1));
817 /* This is needed to get the pict type which is necessary
818 * for generating correct pts. */
819 st->need_parsing = AVSTREAM_PARSE_HEADERS;
821 if (st->codecpar->codec_id == AV_CODEC_ID_MPEG4 &&
822 ast->handler == MKTAG('X', 'V', 'I', 'D'))
823 st->codecpar->codec_tag = MKTAG('X', 'V', 'I', 'D');
825 if (st->codecpar->codec_tag == MKTAG('V', 'S', 'S', 'H'))
826 st->need_parsing = AVSTREAM_PARSE_FULL;
827 if (st->codecpar->codec_id == AV_CODEC_ID_RV40)
828 st->need_parsing = AVSTREAM_PARSE_NONE;
830 if (st->codecpar->codec_tag == 0 && st->codecpar->height > 0 &&
831 st->codecpar->extradata_size < 1U << 30) {
832 st->codecpar->extradata_size += 9;
833 if ((ret = av_reallocp(&st->codecpar->extradata,
834 st->codecpar->extradata_size +
835 AV_INPUT_BUFFER_PADDING_SIZE)) < 0) {
836 st->codecpar->extradata_size = 0;
839 memcpy(st->codecpar->extradata + st->codecpar->extradata_size - 9,
842 st->codecpar->height = FFABS(st->codecpar->height);
844 // avio_skip(pb, size - 5 * 4);
846 case AVMEDIA_TYPE_AUDIO:
847 ret = ff_get_wav_header(s, pb, st->codecpar, size, 0);
850 ast->dshow_block_align = st->codecpar->block_align;
851 if (ast->sample_size && st->codecpar->block_align &&
852 ast->sample_size != st->codecpar->block_align) {
855 "sample size (%d) != block align (%d)\n",
857 st->codecpar->block_align);
858 ast->sample_size = st->codecpar->block_align;
861 * (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
864 /* Force parsing as several audio frames can be in
865 * one packet and timestamps refer to packet start. */
866 st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
867 /* ADTS header is in extradata, AAC without header must be
868 * stored as exact frames. Parser not needed and it will
870 if (st->codecpar->codec_id == AV_CODEC_ID_AAC &&
871 st->codecpar->extradata_size)
872 st->need_parsing = AVSTREAM_PARSE_NONE;
873 // The flac parser does not work with AVSTREAM_PARSE_TIMESTAMPS
874 if (st->codecpar->codec_id == AV_CODEC_ID_FLAC)
875 st->need_parsing = AVSTREAM_PARSE_NONE;
876 /* AVI files with Xan DPCM audio (wrongly) declare PCM
877 * audio in the header but have Axan as stream_code_tag. */
878 if (ast->handler == AV_RL32("Axan")) {
879 st->codecpar->codec_id = AV_CODEC_ID_XAN_DPCM;
880 st->codecpar->codec_tag = 0;
881 ast->dshow_block_align = 0;
883 if (amv_file_format) {
884 st->codecpar->codec_id = AV_CODEC_ID_ADPCM_IMA_AMV;
885 ast->dshow_block_align = 0;
887 if ((st->codecpar->codec_id == AV_CODEC_ID_AAC ||
888 st->codecpar->codec_id == AV_CODEC_ID_FLAC ||
889 st->codecpar->codec_id == AV_CODEC_ID_MP2 ) && ast->dshow_block_align <= 4 && ast->dshow_block_align) {
890 av_log(s, AV_LOG_DEBUG, "overriding invalid dshow_block_align of %d\n", ast->dshow_block_align);
891 ast->dshow_block_align = 0;
893 if (st->codecpar->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align == 1024 && ast->sample_size == 1024 ||
894 st->codecpar->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align == 4096 && ast->sample_size == 4096 ||
895 st->codecpar->codec_id == AV_CODEC_ID_MP3 && ast->dshow_block_align == 1152 && ast->sample_size == 1152) {
896 av_log(s, AV_LOG_DEBUG, "overriding sample_size\n");
897 ast->sample_size = 0;
900 case AVMEDIA_TYPE_SUBTITLE:
901 st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
902 st->request_probe= 1;
906 st->codecpar->codec_type = AVMEDIA_TYPE_DATA;
907 st->codecpar->codec_id = AV_CODEC_ID_NONE;
908 st->codecpar->codec_tag = 0;
914 case MKTAG('s', 't', 'r', 'd'):
915 if (stream_index >= (unsigned)s->nb_streams
916 || s->streams[stream_index]->codecpar->extradata_size
917 || s->streams[stream_index]->codecpar->codec_tag == MKTAG('H','2','6','4')) {
920 uint64_t cur_pos = avio_tell(pb);
921 if (cur_pos < list_end)
922 size = FFMIN(size, list_end - cur_pos);
923 st = s->streams[stream_index];
926 if (st->codecpar->extradata) {
927 av_log(s, AV_LOG_WARNING, "New extradata in strd chunk, freeing previous one.\n");
928 av_freep(&st->codecpar->extradata);
930 if (ff_get_extradata(s, st->codecpar, pb, size) < 0)
931 return AVERROR(ENOMEM);
934 if (st->codecpar->extradata_size & 1) //FIXME check if the encoder really did this correctly
937 ret = avi_extract_stream_metadata(s, st);
939 av_log(s, AV_LOG_WARNING, "could not decoding EXIF data in stream header.\n");
943 case MKTAG('i', 'n', 'd', 'x'):
945 if ((pb->seekable & AVIO_SEEKABLE_NORMAL) && !(s->flags & AVFMT_FLAG_IGNIDX) &&
947 read_odml_index(s, 0) < 0 &&
948 (s->error_recognition & AV_EF_EXPLODE))
950 avio_seek(pb, pos + size, SEEK_SET);
952 case MKTAG('v', 'p', 'r', 'p'):
953 if (stream_index < (unsigned)s->nb_streams && size > 9 * 4) {
954 AVRational active, active_aspect;
956 st = s->streams[stream_index];
963 active_aspect.den = avio_rl16(pb);
964 active_aspect.num = avio_rl16(pb);
965 active.num = avio_rl32(pb);
966 active.den = avio_rl32(pb);
967 avio_rl32(pb); // nbFieldsPerFrame
969 if (active_aspect.num && active_aspect.den &&
970 active.num && active.den) {
971 st->sample_aspect_ratio = av_div_q(active_aspect, active);
972 av_log(s, AV_LOG_TRACE, "vprp %d/%d %d/%d\n",
973 active_aspect.num, active_aspect.den,
974 active.num, active.den);
980 case MKTAG('s', 't', 'r', 'n'):
982 ret = avi_read_tag(s, s->streams[s->nb_streams - 1], tag, size);
988 if (size > 1000000) {
989 av_log(s, AV_LOG_ERROR,
990 "Something went wrong during header parsing, "
991 "tag %s has size %u, "
992 "I will ignore it and try to continue anyway.\n",
993 av_fourcc2str(tag), size);
994 if (s->error_recognition & AV_EF_EXPLODE)
996 avi->movi_list = avio_tell(pb) - 4;
997 avi->movi_end = avi->fsize;
1000 /* Do not fail for very large idx1 tags */
1001 case MKTAG('i', 'd', 'x', '1'):
1004 avio_skip(pb, size);
1010 /* check stream number */
1011 if (stream_index != s->nb_streams - 1) {
1014 return AVERROR_INVALIDDATA;
1017 if (!avi->index_loaded && (pb->seekable & AVIO_SEEKABLE_NORMAL))
1019 calculate_bitrate(s);
1020 avi->index_loaded |= 1;
1022 if ((ret = guess_ni_flag(s)) < 0)
1025 avi->non_interleaved |= ret | (s->flags & AVFMT_FLAG_SORT_DTS);
1027 dict_entry = av_dict_get(s->metadata, "ISFT", NULL, 0);
1028 if (dict_entry && !strcmp(dict_entry->value, "PotEncoder"))
1029 for (i = 0; i < s->nb_streams; i++) {
1030 AVStream *st = s->streams[i];
1031 if ( st->codecpar->codec_id == AV_CODEC_ID_MPEG1VIDEO
1032 || st->codecpar->codec_id == AV_CODEC_ID_MPEG2VIDEO)
1033 st->need_parsing = AVSTREAM_PARSE_FULL;
1036 for (i = 0; i < s->nb_streams; i++) {
1037 AVStream *st = s->streams[i];
1038 if (st->nb_index_entries)
1041 // DV-in-AVI cannot be non-interleaved, if set this must be
1044 avi->non_interleaved = 0;
1045 if (i == s->nb_streams && avi->non_interleaved) {
1046 av_log(s, AV_LOG_WARNING,
1047 "Non-interleaved AVI without index, switching to interleaved\n");
1048 avi->non_interleaved = 0;
1051 if (avi->non_interleaved) {
1052 av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
1056 ff_metadata_conv_ctx(s, NULL, avi_metadata_conv);
1057 ff_metadata_conv_ctx(s, NULL, ff_riff_info_conv);
1062 static int read_gab2_sub(AVFormatContext *s, AVStream *st, AVPacket *pkt)
1064 if (pkt->size >= 7 &&
1065 pkt->size < INT_MAX - AVPROBE_PADDING_SIZE &&
1066 !strcmp(pkt->data, "GAB2") && AV_RL16(pkt->data + 5) == 2) {
1068 int score = AVPROBE_SCORE_EXTENSION, ret;
1069 AVIStream *ast = st->priv_data;
1070 AVInputFormat *sub_demuxer;
1071 AVRational time_base;
1073 AVIOContext *pb = avio_alloc_context(pkt->data + 7,
1075 0, NULL, NULL, NULL, NULL);
1077 unsigned int desc_len = avio_rl32(pb);
1079 if (desc_len > pb->buf_end - pb->buf_ptr)
1082 ret = avio_get_str16le(pb, desc_len, desc, sizeof(desc));
1083 avio_skip(pb, desc_len - ret);
1085 av_dict_set(&st->metadata, "title", desc, 0);
1087 avio_rl16(pb); /* flags? */
1088 avio_rl32(pb); /* data size */
1090 size = pb->buf_end - pb->buf_ptr;
1091 pd = (AVProbeData) { .buf = av_mallocz(size + AVPROBE_PADDING_SIZE),
1095 memcpy(pd.buf, pb->buf_ptr, size);
1096 sub_demuxer = av_probe_input_format2(&pd, 1, &score);
1101 if (!(ast->sub_ctx = avformat_alloc_context()))
1104 ast->sub_ctx->pb = pb;
1106 if (ff_copy_whiteblacklists(ast->sub_ctx, s) < 0)
1109 if (!avformat_open_input(&ast->sub_ctx, "", sub_demuxer, NULL)) {
1110 if (ast->sub_ctx->nb_streams != 1)
1112 ff_read_packet(ast->sub_ctx, &ast->sub_pkt);
1113 avcodec_parameters_copy(st->codecpar, ast->sub_ctx->streams[0]->codecpar);
1114 time_base = ast->sub_ctx->streams[0]->time_base;
1115 avpriv_set_pts_info(st, 64, time_base.num, time_base.den);
1117 ast->sub_buffer = pkt->data;
1118 memset(pkt, 0, sizeof(*pkt));
1122 av_freep(&ast->sub_ctx);
1128 static AVStream *get_subtitle_pkt(AVFormatContext *s, AVStream *next_st,
1131 AVIStream *ast, *next_ast = next_st->priv_data;
1132 int64_t ts, next_ts, ts_min = INT64_MAX;
1133 AVStream *st, *sub_st = NULL;
1136 next_ts = av_rescale_q(next_ast->frame_offset, next_st->time_base,
1139 for (i = 0; i < s->nb_streams; i++) {
1141 ast = st->priv_data;
1142 if (st->discard < AVDISCARD_ALL && ast && ast->sub_pkt.data) {
1143 ts = av_rescale_q(ast->sub_pkt.dts, st->time_base, AV_TIME_BASE_Q);
1144 if (ts <= next_ts && ts < ts_min) {
1152 ast = sub_st->priv_data;
1153 *pkt = ast->sub_pkt;
1154 pkt->stream_index = sub_st->index;
1156 if (ff_read_packet(ast->sub_ctx, &ast->sub_pkt) < 0)
1157 ast->sub_pkt.data = NULL;
1162 static int get_stream_idx(const unsigned *d)
1164 if (d[0] >= '0' && d[0] <= '9' &&
1165 d[1] >= '0' && d[1] <= '9') {
1166 return (d[0] - '0') * 10 + (d[1] - '0');
1168 return 100; // invalid stream ID
1174 * @param exit_early set to 1 to just gather packet position without making the changes needed to actually read & return the packet
1176 static int avi_sync(AVFormatContext *s, int exit_early)
1178 AVIContext *avi = s->priv_data;
1179 AVIOContext *pb = s->pb;
1186 memset(d, -1, sizeof(d));
1187 for (i = sync = avio_tell(pb); !avio_feof(pb); i++) {
1190 for (j = 0; j < 7; j++)
1194 size = d[4] + (d[5] << 8) + (d[6] << 16) + (d[7] << 24);
1196 n = get_stream_idx(d + 2);
1197 ff_tlog(s, "%X %X %X %X %X %X %X %X %"PRId64" %u %d\n",
1198 d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], i, size, n);
1199 if (i*(avi->io_fsize>0) + (uint64_t)size > avi->fsize || d[0] > 127)
1203 if ((d[0] == 'i' && d[1] == 'x' && n < s->nb_streams) ||
1205 (d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K') ||
1206 (d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1') ||
1207 (d[0] == 'i' && d[1] == 'n' && d[2] == 'd' && d[3] == 'x')) {
1208 avio_skip(pb, size);
1213 if (d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T') {
1218 n = get_stream_idx(d);
1220 if (!((i - avi->last_pkt_pos) & 1) &&
1221 get_stream_idx(d + 1) < s->nb_streams)
1224 // detect ##ix chunk and skip
1225 if (d[2] == 'i' && d[3] == 'x' && n < s->nb_streams) {
1226 avio_skip(pb, size);
1230 if (avi->dv_demux && n != 0)
1234 if (n < s->nb_streams) {
1238 ast = st->priv_data;
1241 av_log(s, AV_LOG_WARNING, "Skipping foreign stream %d packet\n", n);
1245 if (s->nb_streams >= 2) {
1246 AVStream *st1 = s->streams[1];
1247 AVIStream *ast1 = st1->priv_data;
1248 // workaround for broken small-file-bug402.avi
1249 if ( d[2] == 'w' && d[3] == 'b'
1251 && st ->codecpar->codec_type == AVMEDIA_TYPE_VIDEO
1252 && st1->codecpar->codec_type == AVMEDIA_TYPE_AUDIO
1253 && ast->prefix == 'd'*256+'c'
1254 && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
1259 av_log(s, AV_LOG_WARNING,
1260 "Invalid stream + prefix combination, assuming audio.\n");
1264 if (!avi->dv_demux &&
1265 ((st->discard >= AVDISCARD_DEFAULT && size == 0) /* ||
1266 // FIXME: needs a little reordering
1267 (st->discard >= AVDISCARD_NONKEY &&
1268 !(pkt->flags & AV_PKT_FLAG_KEY)) */
1269 || st->discard >= AVDISCARD_ALL)) {
1271 ast->frame_offset += get_duration(ast, size);
1272 avio_skip(pb, size);
1277 if (d[2] == 'p' && d[3] == 'c' && size <= 4 * 256 + 4) {
1278 int k = avio_r8(pb);
1279 int last = (k + avio_r8(pb) - 1) & 0xFF;
1281 avio_rl16(pb); // flags
1283 // b + (g << 8) + (r << 16);
1284 for (; k <= last; k++)
1285 ast->pal[k] = 0xFFU<<24 | avio_rb32(pb)>>8;
1289 } else if (((ast->prefix_count < 5 || sync + 9 > i) &&
1290 d[2] < 128 && d[3] < 128) ||
1291 d[2] * 256 + d[3] == ast->prefix /* ||
1292 (d[2] == 'd' && d[3] == 'c') ||
1293 (d[2] == 'w' && d[3] == 'b') */) {
1296 if (d[2] * 256 + d[3] == ast->prefix)
1297 ast->prefix_count++;
1299 ast->prefix = d[2] * 256 + d[3];
1300 ast->prefix_count = 0;
1303 avi->stream_index = n;
1304 ast->packet_size = size + 8;
1305 ast->remaining = size;
1308 uint64_t pos = avio_tell(pb) - 8;
1309 if (!st->index_entries || !st->nb_index_entries ||
1310 st->index_entries[st->nb_index_entries - 1].pos < pos) {
1311 av_add_index_entry(st, pos, ast->frame_offset, size,
1312 0, AVINDEX_KEYFRAME);
1325 static int ni_prepare_read(AVFormatContext *s)
1327 AVIContext *avi = s->priv_data;
1328 int best_stream_index = 0;
1329 AVStream *best_st = NULL;
1330 AVIStream *best_ast;
1331 int64_t best_ts = INT64_MAX;
1334 for (i = 0; i < s->nb_streams; i++) {
1335 AVStream *st = s->streams[i];
1336 AVIStream *ast = st->priv_data;
1337 int64_t ts = ast->frame_offset;
1340 if (!st->nb_index_entries)
1343 last_ts = st->index_entries[st->nb_index_entries - 1].timestamp;
1344 if (!ast->remaining && ts > last_ts)
1347 ts = av_rescale_q(ts, st->time_base,
1348 (AVRational) { FFMAX(1, ast->sample_size),
1351 av_log(s, AV_LOG_TRACE, "%"PRId64" %d/%d %"PRId64"\n", ts,
1352 st->time_base.num, st->time_base.den, ast->frame_offset);
1356 best_stream_index = i;
1362 best_ast = best_st->priv_data;
1363 best_ts = best_ast->frame_offset;
1364 if (best_ast->remaining) {
1365 i = av_index_search_timestamp(best_st,
1368 AVSEEK_FLAG_BACKWARD);
1370 i = av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
1372 best_ast->frame_offset = best_st->index_entries[i].timestamp;
1376 int64_t pos = best_st->index_entries[i].pos;
1377 pos += best_ast->packet_size - best_ast->remaining;
1378 if (avio_seek(s->pb, pos + 8, SEEK_SET) < 0)
1381 av_assert0(best_ast->remaining <= best_ast->packet_size);
1383 avi->stream_index = best_stream_index;
1384 if (!best_ast->remaining)
1385 best_ast->packet_size =
1386 best_ast->remaining = best_st->index_entries[i].size;
1394 static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
1396 AVIContext *avi = s->priv_data;
1397 AVIOContext *pb = s->pb;
1400 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1401 int size = avpriv_dv_get_packet(avi->dv_demux, pkt);
1408 if (avi->non_interleaved) {
1409 err = ni_prepare_read(s);
1415 if (avi->stream_index >= 0) {
1416 AVStream *st = s->streams[avi->stream_index];
1417 AVIStream *ast = st->priv_data;
1420 if (get_subtitle_pkt(s, st, pkt))
1423 // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
1424 if (ast->sample_size <= 1)
1426 else if (ast->sample_size < 32)
1427 // arbitrary multiplier to avoid tiny packets for raw PCM data
1428 size = 1024 * ast->sample_size;
1430 size = ast->sample_size;
1432 if (size > ast->remaining)
1433 size = ast->remaining;
1434 avi->last_pkt_pos = avio_tell(pb);
1435 err = av_get_packet(pb, pkt, size);
1440 if (ast->has_pal && pkt->size < (unsigned)INT_MAX / 2) {
1442 pal = av_packet_new_side_data(pkt,
1443 AV_PKT_DATA_PALETTE,
1446 av_log(s, AV_LOG_ERROR,
1447 "Failed to allocate data for palette\n");
1449 memcpy(pal, ast->pal, AVPALETTE_SIZE);
1454 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1455 AVBufferRef *avbuf = pkt->buf;
1456 size = avpriv_dv_produce_packet(avi->dv_demux, pkt,
1457 pkt->data, pkt->size, pkt->pos);
1459 pkt->flags |= AV_PKT_FLAG_KEY;
1461 av_packet_unref(pkt);
1462 } else if (st->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE &&
1463 !st->codecpar->codec_tag && read_gab2_sub(s, st, pkt)) {
1464 ast->frame_offset++;
1465 avi->stream_index = -1;
1469 /* XXX: How to handle B-frames in AVI? */
1470 pkt->dts = ast->frame_offset;
1471 // pkt->dts += ast->start;
1472 if (ast->sample_size)
1473 pkt->dts /= ast->sample_size;
1474 pkt->stream_index = avi->stream_index;
1476 if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && st->index_entries) {
1480 index = av_index_search_timestamp(st, ast->frame_offset, AVSEEK_FLAG_ANY);
1481 e = &st->index_entries[index];
1483 if (index >= 0 && e->timestamp == ast->frame_offset) {
1484 if (index == st->nb_index_entries-1) {
1487 if (st->codecpar->codec_id == AV_CODEC_ID_MPEG4) {
1488 const uint8_t *ptr = pkt->data, *end = ptr + FFMIN(size, 256);
1490 ptr = avpriv_find_start_code(ptr, end, &state);
1491 if (state == 0x1B6 && ptr < end) {
1492 key = !(*ptr & 0xC0);
1498 e->flags &= ~AVINDEX_KEYFRAME;
1500 if (e->flags & AVINDEX_KEYFRAME)
1501 pkt->flags |= AV_PKT_FLAG_KEY;
1504 pkt->flags |= AV_PKT_FLAG_KEY;
1506 ast->frame_offset += get_duration(ast, pkt->size);
1508 ast->remaining -= err;
1509 if (!ast->remaining) {
1510 avi->stream_index = -1;
1511 ast->packet_size = 0;
1514 if (!avi->non_interleaved && pkt->pos >= 0 && ast->seek_pos > pkt->pos) {
1515 av_packet_unref(pkt);
1520 if (!avi->non_interleaved && st->nb_index_entries>1 && avi->index_loaded>1) {
1521 int64_t dts= av_rescale_q(pkt->dts, st->time_base, AV_TIME_BASE_Q);
1523 if (avi->dts_max - dts > 2*AV_TIME_BASE) {
1524 avi->non_interleaved= 1;
1525 av_log(s, AV_LOG_INFO, "Switching to NI mode, due to poor interleaving\n");
1526 }else if (avi->dts_max < dts)
1533 if ((err = avi_sync(s, 0)) < 0)
1538 /* XXX: We make the implicit supposition that the positions are sorted
1539 * for each stream. */
1540 static int avi_read_idx1(AVFormatContext *s, int size)
1542 AVIContext *avi = s->priv_data;
1543 AVIOContext *pb = s->pb;
1544 int nb_index_entries, i;
1548 unsigned int index, tag, flags, len, first_packet = 1;
1549 int64_t last_pos = -1;
1550 unsigned last_idx = -1;
1551 int64_t idx1_pos, first_packet_pos = 0, data_offset = 0;
1554 nb_index_entries = size / 16;
1555 if (nb_index_entries <= 0)
1556 return AVERROR_INVALIDDATA;
1558 idx1_pos = avio_tell(pb);
1559 avio_seek(pb, avi->movi_list + 4, SEEK_SET);
1560 if (avi_sync(s, 1) == 0)
1561 first_packet_pos = avio_tell(pb) - 8;
1562 avi->stream_index = -1;
1563 avio_seek(pb, idx1_pos, SEEK_SET);
1565 if (s->nb_streams == 1 && s->streams[0]->codecpar->codec_tag == AV_RL32("MMES")) {
1566 first_packet_pos = 0;
1567 data_offset = avi->movi_list;
1570 /* Read the entries and sort them in each stream component. */
1571 for (i = 0; i < nb_index_entries; i++) {
1575 tag = avio_rl32(pb);
1576 flags = avio_rl32(pb);
1577 pos = avio_rl32(pb);
1578 len = avio_rl32(pb);
1579 av_log(s, AV_LOG_TRACE, "%d: tag=0x%x flags=0x%x pos=0x%"PRIx64" len=%d/",
1580 i, tag, flags, pos, len);
1582 index = ((tag & 0xff) - '0') * 10;
1583 index += (tag >> 8 & 0xff) - '0';
1584 if (index >= s->nb_streams)
1586 st = s->streams[index];
1587 ast = st->priv_data;
1589 /* Skip 'xxpc' palette change entries in the index until a logic
1590 * to process these is properly implemented. */
1591 if ((tag >> 16 & 0xff) == 'p' && (tag >> 24 & 0xff) == 'c')
1594 if (first_packet && first_packet_pos) {
1595 if (avi->movi_list + 4 != pos || pos + 500 > first_packet_pos)
1596 data_offset = first_packet_pos - pos;
1601 av_log(s, AV_LOG_TRACE, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
1603 // even if we have only a single stream, we should
1604 // switch to non-interleaved to get correct timestamps
1605 if (last_pos == pos)
1606 avi->non_interleaved = 1;
1607 if (last_idx != pos && len) {
1608 av_add_index_entry(st, pos, ast->cum_len, len, 0,
1609 (flags & AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
1612 ast->cum_len += get_duration(ast, len);
1614 anykey |= flags&AVIIF_INDEX;
1617 for (index = 0; index < s->nb_streams; index++) {
1618 st = s->streams[index];
1619 if (st->nb_index_entries)
1620 st->index_entries[0].flags |= AVINDEX_KEYFRAME;
1626 /* Scan the index and consider any file with streams more than
1627 * 2 seconds or 64MB apart non-interleaved. */
1628 static int check_stream_max_drift(AVFormatContext *s)
1630 int64_t min_pos, pos;
1632 int *idx = av_mallocz_array(s->nb_streams, sizeof(*idx));
1634 return AVERROR(ENOMEM);
1635 for (min_pos = pos = 0; min_pos != INT64_MAX; pos = min_pos + 1LU) {
1636 int64_t max_dts = INT64_MIN / 2;
1637 int64_t min_dts = INT64_MAX / 2;
1638 int64_t max_buffer = 0;
1640 min_pos = INT64_MAX;
1642 for (i = 0; i < s->nb_streams; i++) {
1643 AVStream *st = s->streams[i];
1644 AVIStream *ast = st->priv_data;
1645 int n = st->nb_index_entries;
1646 while (idx[i] < n && st->index_entries[idx[i]].pos < pos)
1650 dts = av_rescale_q(st->index_entries[idx[i]].timestamp /
1651 FFMAX(ast->sample_size, 1),
1652 st->time_base, AV_TIME_BASE_Q);
1653 min_dts = FFMIN(min_dts, dts);
1654 min_pos = FFMIN(min_pos, st->index_entries[idx[i]].pos);
1657 for (i = 0; i < s->nb_streams; i++) {
1658 AVStream *st = s->streams[i];
1659 AVIStream *ast = st->priv_data;
1661 if (idx[i] && min_dts != INT64_MAX / 2) {
1663 dts = av_rescale_q(st->index_entries[idx[i] - 1].timestamp /
1664 FFMAX(ast->sample_size, 1),
1665 st->time_base, AV_TIME_BASE_Q);
1666 max_dts = FFMAX(max_dts, dts);
1667 max_buffer = FFMAX(max_buffer,
1668 av_rescale(dts - min_dts,
1669 st->codecpar->bit_rate,
1673 if (max_dts - min_dts > 2 * AV_TIME_BASE ||
1674 max_buffer > 1024 * 1024 * 8 * 8) {
1683 static int guess_ni_flag(AVFormatContext *s)
1686 int64_t last_start = 0;
1687 int64_t first_end = INT64_MAX;
1688 int64_t oldpos = avio_tell(s->pb);
1690 for (i = 0; i < s->nb_streams; i++) {
1691 AVStream *st = s->streams[i];
1692 int n = st->nb_index_entries;
1699 int64_t pos = st->index_entries[0].pos;
1701 avio_seek(s->pb, pos, SEEK_SET);
1702 tag[0] = avio_r8(s->pb);
1703 tag[1] = avio_r8(s->pb);
1705 size = avio_rl32(s->pb);
1706 if (get_stream_idx(tag) == i && pos + size > st->index_entries[1].pos)
1707 last_start = INT64_MAX;
1708 if (get_stream_idx(tag) == i && size == st->index_entries[0].size + 8)
1709 last_start = INT64_MAX;
1712 if (st->index_entries[0].pos > last_start)
1713 last_start = st->index_entries[0].pos;
1714 if (st->index_entries[n - 1].pos < first_end)
1715 first_end = st->index_entries[n - 1].pos;
1717 avio_seek(s->pb, oldpos, SEEK_SET);
1719 if (last_start > first_end)
1722 return check_stream_max_drift(s);
1725 static int avi_load_index(AVFormatContext *s)
1727 AVIContext *avi = s->priv_data;
1728 AVIOContext *pb = s->pb;
1730 int64_t pos = avio_tell(pb);
1734 if (avio_seek(pb, avi->movi_end, SEEK_SET) < 0)
1735 goto the_end; // maybe truncated file
1736 av_log(s, AV_LOG_TRACE, "movi_end=0x%"PRIx64"\n", avi->movi_end);
1738 tag = avio_rl32(pb);
1739 size = avio_rl32(pb);
1742 next = avio_tell(pb) + size + (size & 1);
1744 if (tag == MKTAG('i', 'd', 'x', '1') &&
1745 avi_read_idx1(s, size) >= 0) {
1746 avi->index_loaded=2;
1748 }else if (tag == MKTAG('L', 'I', 'S', 'T')) {
1749 uint32_t tag1 = avio_rl32(pb);
1751 if (tag1 == MKTAG('I', 'N', 'F', 'O'))
1752 ff_read_riff_info(s, size - 4);
1756 if (avio_seek(pb, next, SEEK_SET) < 0)
1757 break; // something is wrong here
1761 avio_seek(pb, pos, SEEK_SET);
1765 static void seek_subtitle(AVStream *st, AVStream *st2, int64_t timestamp)
1767 AVIStream *ast2 = st2->priv_data;
1768 int64_t ts2 = av_rescale_q(timestamp, st->time_base, st2->time_base);
1769 av_packet_unref(&ast2->sub_pkt);
1770 if (avformat_seek_file(ast2->sub_ctx, 0, INT64_MIN, ts2, ts2, 0) >= 0 ||
1771 avformat_seek_file(ast2->sub_ctx, 0, ts2, ts2, INT64_MAX, 0) >= 0)
1772 ff_read_packet(ast2->sub_ctx, &ast2->sub_pkt);
1775 static int avi_read_seek(AVFormatContext *s, int stream_index,
1776 int64_t timestamp, int flags)
1778 AVIContext *avi = s->priv_data;
1781 int64_t pos, pos_min;
1784 /* Does not matter which stream is requested dv in avi has the
1785 * stream information in the first video stream.
1790 if (!avi->index_loaded) {
1791 /* we only load the index on demand */
1793 avi->index_loaded |= 1;
1795 av_assert0(stream_index >= 0);
1797 st = s->streams[stream_index];
1798 ast = st->priv_data;
1799 index = av_index_search_timestamp(st,
1800 timestamp * FFMAX(ast->sample_size, 1),
1803 if (st->nb_index_entries > 0)
1804 av_log(s, AV_LOG_DEBUG, "Failed to find timestamp %"PRId64 " in index %"PRId64 " .. %"PRId64 "\n",
1805 timestamp * FFMAX(ast->sample_size, 1),
1806 st->index_entries[0].timestamp,
1807 st->index_entries[st->nb_index_entries - 1].timestamp);
1808 return AVERROR_INVALIDDATA;
1811 /* find the position */
1812 pos = st->index_entries[index].pos;
1813 timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1);
1815 av_log(s, AV_LOG_TRACE, "XX %"PRId64" %d %"PRId64"\n",
1816 timestamp, index, st->index_entries[index].timestamp);
1818 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1819 /* One and only one real stream for DV in AVI, and it has video */
1820 /* offsets. Calling with other stream indexes should have failed */
1821 /* the av_index_search_timestamp call above. */
1823 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
1826 /* Feed the DV video stream version of the timestamp to the */
1827 /* DV demux so it can synthesize correct timestamps. */
1828 ff_dv_offset_reset(avi->dv_demux, timestamp);
1830 avi->stream_index = -1;
1835 for (i = 0; i < s->nb_streams; i++) {
1836 AVStream *st2 = s->streams[i];
1837 AVIStream *ast2 = st2->priv_data;
1840 ast2->remaining = 0;
1842 if (ast2->sub_ctx) {
1843 seek_subtitle(st, st2, timestamp);
1847 if (st2->nb_index_entries <= 0)
1850 // av_assert1(st2->codecpar->block_align);
1851 index = av_index_search_timestamp(st2,
1852 av_rescale_q(timestamp,
1855 FFMAX(ast2->sample_size, 1),
1857 AVSEEK_FLAG_BACKWARD |
1858 (st2->codecpar->codec_type != AVMEDIA_TYPE_VIDEO ? AVSEEK_FLAG_ANY : 0));
1861 ast2->seek_pos = st2->index_entries[index].pos;
1862 pos_min = FFMIN(pos_min,ast2->seek_pos);
1864 for (i = 0; i < s->nb_streams; i++) {
1865 AVStream *st2 = s->streams[i];
1866 AVIStream *ast2 = st2->priv_data;
1868 if (ast2->sub_ctx || st2->nb_index_entries <= 0)
1871 index = av_index_search_timestamp(
1873 av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
1874 flags | AVSEEK_FLAG_BACKWARD | (st2->codecpar->codec_type != AVMEDIA_TYPE_VIDEO ? AVSEEK_FLAG_ANY : 0));
1877 while (!avi->non_interleaved && index>0 && st2->index_entries[index-1].pos >= pos_min)
1879 ast2->frame_offset = st2->index_entries[index].timestamp;
1883 if (avio_seek(s->pb, pos_min, SEEK_SET) < 0) {
1884 av_log(s, AV_LOG_ERROR, "Seek failed\n");
1887 avi->stream_index = -1;
1888 avi->dts_max = INT_MIN;
1892 static int avi_read_close(AVFormatContext *s)
1895 AVIContext *avi = s->priv_data;
1897 for (i = 0; i < s->nb_streams; i++) {
1898 AVStream *st = s->streams[i];
1899 AVIStream *ast = st->priv_data;
1902 av_freep(&ast->sub_ctx->pb);
1903 avformat_close_input(&ast->sub_ctx);
1905 av_freep(&ast->sub_buffer);
1906 av_packet_unref(&ast->sub_pkt);
1910 av_freep(&avi->dv_demux);
1915 static int avi_probe(AVProbeData *p)
1919 /* check file header */
1920 for (i = 0; avi_headers[i][0]; i++)
1921 if (AV_RL32(p->buf ) == AV_RL32(avi_headers[i] ) &&
1922 AV_RL32(p->buf + 8) == AV_RL32(avi_headers[i] + 4))
1923 return AVPROBE_SCORE_MAX;
1928 AVInputFormat ff_avi_demuxer = {
1930 .long_name = NULL_IF_CONFIG_SMALL("AVI (Audio Video Interleaved)"),
1931 .priv_data_size = sizeof(AVIContext),
1932 .extensions = "avi",
1933 .read_probe = avi_probe,
1934 .read_header = avi_read_header,
1935 .read_packet = avi_read_packet,
1936 .read_close = avi_read_close,
1937 .read_seek = avi_read_seek,
1938 .priv_class = &demuxer_class,