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/opt.h"
27 #include "libavutil/dict.h"
28 #include "libavutil/internal.h"
29 #include "libavutil/intreadwrite.h"
30 #include "libavutil/mathematics.h"
37 #include "libavcodec/bytestream.h"
38 #include "libavcodec/exif.h"
39 #include "libavcodec/internal.h"
41 typedef struct AVIStream {
42 int64_t frame_offset; /* current frame (video) or byte (audio) counter
43 * (used to compute the pts) */
50 int sample_size; /* size of one sample (or packet)
51 * (in the rate/scale sense) in bytes */
53 int64_t cum_len; /* temporary storage (used during seek) */
54 int prefix; /* normally 'd'<<8 + 'c' or 'w'<<8 + 'b' */
58 int dshow_block_align; /* block align variable used to emulate bugs in
59 * the MS dshow demuxer */
61 AVFormatContext *sub_ctx;
68 typedef struct AVIContext {
80 DVDemuxContext *dv_demux;
83 #define MAX_ODML_DEPTH 1000
88 static const AVOption options[] = {
89 { "use_odml", "use odml index", offsetof(AVIContext, use_odml), AV_OPT_TYPE_BOOL, {.i64 = 1}, -1, 1, AV_OPT_FLAG_DECODING_PARAM},
93 static const AVClass demuxer_class = {
95 .item_name = av_default_item_name,
97 .version = LIBAVUTIL_VERSION_INT,
98 .category = AV_CLASS_CATEGORY_DEMUXER,
102 static const char avi_headers[][8] = {
103 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', ' ' },
104 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 'X' },
105 { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 0x19 },
106 { 'O', 'N', '2', ' ', 'O', 'N', '2', 'f' },
107 { 'R', 'I', 'F', 'F', 'A', 'M', 'V', ' ' },
111 static const AVMetadataConv avi_metadata_conv[] = {
116 static int avi_load_index(AVFormatContext *s);
117 static int guess_ni_flag(AVFormatContext *s);
119 #define print_tag(s, str, tag, size) \
120 av_log(s, AV_LOG_TRACE, "pos:%"PRIX64" %s: tag=%s size=0x%x\n", \
121 avio_tell(pb), str, av_fourcc2str(tag), size) \
123 static inline int get_duration(AVIStream *ast, int len)
125 if (ast->sample_size)
127 else if (ast->dshow_block_align)
128 return (len + ast->dshow_block_align - 1) / ast->dshow_block_align;
133 static int get_riff(AVFormatContext *s, AVIOContext *pb)
135 AVIContext *avi = s->priv_data;
136 char header[8] = {0};
139 /* check RIFF header */
140 avio_read(pb, header, 4);
141 avi->riff_end = avio_rl32(pb); /* RIFF chunk size */
142 avi->riff_end += avio_tell(pb); /* RIFF chunk end */
143 avio_read(pb, header + 4, 4);
145 for (i = 0; avi_headers[i][0]; i++)
146 if (!memcmp(header, avi_headers[i], 8))
148 if (!avi_headers[i][0])
149 return AVERROR_INVALIDDATA;
151 if (header[7] == 0x19)
152 av_log(s, AV_LOG_INFO,
153 "This file has been generated by a totally broken muxer.\n");
158 static int read_odml_index(AVFormatContext *s, int frame_num)
160 AVIContext *avi = s->priv_data;
161 AVIOContext *pb = s->pb;
162 int longs_per_entry = avio_rl16(pb);
163 int index_sub_type = avio_r8(pb);
164 int index_type = avio_r8(pb);
165 int entries_in_use = avio_rl32(pb);
166 int chunk_id = avio_rl32(pb);
167 int64_t base = avio_rl64(pb);
168 int stream_id = ((chunk_id & 0xFF) - '0') * 10 +
169 ((chunk_id >> 8 & 0xFF) - '0');
173 int64_t last_pos = -1;
174 int64_t filesize = avi->fsize;
176 av_log(s, AV_LOG_TRACE,
177 "longs_per_entry:%d index_type:%d entries_in_use:%d "
178 "chunk_id:%X base:%16"PRIX64" frame_num:%d\n",
186 if (stream_id >= s->nb_streams || stream_id < 0)
187 return AVERROR_INVALIDDATA;
188 st = s->streams[stream_id];
192 return AVERROR_INVALIDDATA;
196 if (index_type && longs_per_entry != 2)
197 return AVERROR_INVALIDDATA;
199 return AVERROR_INVALIDDATA;
201 if (filesize > 0 && base >= filesize) {
202 av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
203 if (base >> 32 == (base & 0xFFFFFFFF) &&
204 (base & 0xFFFFFFFF) < filesize &&
205 filesize <= 0xFFFFFFFF)
208 return AVERROR_INVALIDDATA;
211 for (i = 0; i < entries_in_use; i++) {
213 int64_t pos = avio_rl32(pb) + base - 8;
214 int len = avio_rl32(pb);
218 av_log(s, AV_LOG_TRACE, "pos:%"PRId64", len:%X\n", pos, len);
221 return AVERROR_INVALIDDATA;
223 if (last_pos == pos || pos == base - 8)
224 avi->non_interleaved = 1;
225 if (last_pos != pos && len)
226 av_add_index_entry(st, pos, ast->cum_len, len, 0,
227 key ? AVINDEX_KEYFRAME : 0);
229 ast->cum_len += get_duration(ast, len);
234 offset = avio_rl64(pb);
235 avio_rl32(pb); /* size */
236 duration = avio_rl32(pb);
239 return AVERROR_INVALIDDATA;
243 if (avi->odml_depth > MAX_ODML_DEPTH) {
244 av_log(s, AV_LOG_ERROR, "Too deeply nested ODML indexes\n");
245 return AVERROR_INVALIDDATA;
248 if (avio_seek(pb, offset + 8, SEEK_SET) < 0)
251 read_odml_index(s, frame_num);
253 frame_num += duration;
255 if (avio_seek(pb, pos, SEEK_SET) < 0) {
256 av_log(s, AV_LOG_ERROR, "Failed to restore position after reading index\n");
262 avi->index_loaded = 2;
266 static void clean_index(AVFormatContext *s)
271 for (i = 0; i < s->nb_streams; i++) {
272 AVStream *st = s->streams[i];
273 AVIStream *ast = st->priv_data;
274 int n = st->nb_index_entries;
275 int max = ast->sample_size;
276 int64_t pos, size, ts;
278 if (n != 1 || ast->sample_size == 0)
284 pos = st->index_entries[0].pos;
285 size = st->index_entries[0].size;
286 ts = st->index_entries[0].timestamp;
288 for (j = 0; j < size; j += max)
289 av_add_index_entry(st, pos + j, ts + j, FFMIN(max, size - j), 0,
294 static int avi_read_tag(AVFormatContext *s, AVStream *st, uint32_t tag,
297 AVIOContext *pb = s->pb;
303 if (size == UINT_MAX)
304 return AVERROR(EINVAL);
305 value = av_malloc(size + 1);
307 return AVERROR(ENOMEM);
308 if (avio_read(pb, value, size) != size) {
310 return AVERROR_INVALIDDATA;
316 return av_dict_set(st ? &st->metadata : &s->metadata, key, value,
317 AV_DICT_DONT_STRDUP_VAL);
320 static const char months[12][4] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
321 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
323 static void avi_metadata_creation_time(AVDictionary **metadata, char *date)
325 char month[4], time[9], buffer[64];
327 /* parse standard AVI date format (ie. "Mon Mar 10 15:04:43 2003") */
328 if (sscanf(date, "%*3s%*[ ]%3s%*[ ]%2d%*[ ]%8s%*[ ]%4d",
329 month, &day, time, &year) == 4) {
330 for (i = 0; i < 12; i++)
331 if (!av_strcasecmp(month, months[i])) {
332 snprintf(buffer, sizeof(buffer), "%.4d-%.2d-%.2d %s",
333 year, i + 1, day, time);
334 av_dict_set(metadata, "creation_time", buffer, 0);
336 } else if (date[4] == '/' && date[7] == '/') {
337 date[4] = date[7] = '-';
338 av_dict_set(metadata, "creation_time", date, 0);
342 static void avi_read_nikon(AVFormatContext *s, uint64_t end)
344 while (avio_tell(s->pb) < end && !avio_feof(s->pb)) {
345 uint32_t tag = avio_rl32(s->pb);
346 uint32_t size = avio_rl32(s->pb);
348 case MKTAG('n', 'c', 't', 'g'): /* Nikon Tags */
350 uint64_t tag_end = avio_tell(s->pb) + size;
351 while (avio_tell(s->pb) < tag_end && !avio_feof(s->pb)) {
352 uint16_t tag = avio_rl16(s->pb);
353 uint16_t size = avio_rl16(s->pb);
354 const char *name = NULL;
355 char buffer[64] = { 0 };
356 size = FFMIN(size, tag_end - avio_tell(s->pb));
357 size -= avio_read(s->pb, buffer,
358 FFMIN(size, sizeof(buffer) - 1));
367 name = "creation_time";
368 if (buffer[4] == ':' && buffer[7] == ':')
369 buffer[4] = buffer[7] = '-';
373 av_dict_set(&s->metadata, name, buffer, 0);
374 avio_skip(s->pb, size);
379 avio_skip(s->pb, size);
385 static int avi_extract_stream_metadata(AVFormatContext *s, AVStream *st)
388 uint8_t *data = st->codecpar->extradata;
389 int data_size = st->codecpar->extradata_size;
392 if (!data || data_size < 8) {
393 return AVERROR_INVALIDDATA;
396 bytestream2_init(&gb, data, data_size);
398 tag = bytestream2_get_le32(&gb);
401 case MKTAG('A', 'V', 'I', 'F'):
402 // skip 4 byte padding
403 bytestream2_skip(&gb, 4);
404 offset = bytestream2_tell(&gb);
406 // decode EXIF tags from IFD, AVI is always little-endian
407 return avpriv_exif_decode_ifd(s, data + offset, data_size - offset,
408 1, 0, &st->metadata);
410 case MKTAG('C', 'A', 'S', 'I'):
411 avpriv_request_sample(s, "RIFF stream data tag type CASI (%u)", tag);
413 case MKTAG('Z', 'o', 'r', 'a'):
414 avpriv_request_sample(s, "RIFF stream data tag type Zora (%u)", tag);
423 static int calculate_bitrate(AVFormatContext *s)
425 AVIContext *avi = s->priv_data;
430 for (i = 0; i<s->nb_streams; i++) {
432 AVStream *st = s->streams[i];
434 if (!st->nb_index_entries)
437 for (j = 0; j < st->nb_index_entries; j++)
438 len += st->index_entries[j].size;
439 maxpos = FFMAX(maxpos, st->index_entries[j-1].pos);
442 if (maxpos < avi->io_fsize*9/10) // index does not cover the whole file
444 if (lensum*9/10 > maxpos || lensum < maxpos*9/10) // frame sum and filesize mismatch
447 for (i = 0; i<s->nb_streams; i++) {
449 AVStream *st = s->streams[i];
453 for (j = 0; j < st->nb_index_entries; j++)
454 len += st->index_entries[j].size;
456 if (st->nb_index_entries < 2 || st->codecpar->bit_rate > 0)
458 duration = st->index_entries[j-1].timestamp - st->index_entries[0].timestamp;
459 bitrate = av_rescale(8*len, st->time_base.den, duration * st->time_base.num);
461 st->codecpar->bit_rate = bitrate;
467 static int avi_read_header(AVFormatContext *s)
469 AVIContext *avi = s->priv_data;
470 AVIOContext *pb = s->pb;
471 unsigned int tag, tag1, handler;
472 int codec_type, stream_index, frame_period;
476 AVIStream *ast = NULL;
477 int avih_width = 0, avih_height = 0;
478 int amv_file_format = 0;
479 uint64_t list_end = 0;
482 AVDictionaryEntry *dict_entry;
484 avi->stream_index = -1;
486 ret = get_riff(s, pb);
490 av_log(avi, AV_LOG_DEBUG, "use odml:%d\n", avi->use_odml);
492 avi->io_fsize = avi->fsize = avio_size(pb);
493 if (avi->fsize <= 0 || avi->fsize < avi->riff_end)
494 avi->fsize = avi->riff_end == 8 ? INT64_MAX : avi->riff_end;
504 size = avio_rl32(pb);
506 print_tag(s, "tag", tag, size);
509 case MKTAG('L', 'I', 'S', 'T'):
510 list_end = avio_tell(pb) + size;
511 /* Ignored, except at start of video packets. */
512 tag1 = avio_rl32(pb);
514 print_tag(s, "list", tag1, 0);
516 if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
517 avi->movi_list = avio_tell(pb) - 4;
519 avi->movi_end = avi->movi_list + size + (size & 1);
521 avi->movi_end = avi->fsize;
522 av_log(s, AV_LOG_TRACE, "movi end=%"PRIx64"\n", avi->movi_end);
524 } else if (tag1 == MKTAG('I', 'N', 'F', 'O'))
525 ff_read_riff_info(s, size - 4);
526 else if (tag1 == MKTAG('n', 'c', 'd', 't'))
527 avi_read_nikon(s, list_end);
530 case MKTAG('I', 'D', 'I', 'T'):
532 unsigned char date[64] = { 0 };
534 size -= avio_read(pb, date, FFMIN(size, sizeof(date) - 1));
536 avi_metadata_creation_time(&s->metadata, date);
539 case MKTAG('d', 'm', 'l', 'h'):
541 avio_skip(pb, size + (size & 1));
543 case MKTAG('a', 'm', 'v', 'h'):
545 case MKTAG('a', 'v', 'i', 'h'):
547 /* using frame_period is bad idea */
548 frame_period = avio_rl32(pb);
549 avio_rl32(pb); /* max. bytes per second */
551 avi->non_interleaved |= avio_rl32(pb) & AVIF_MUSTUSEINDEX;
553 avio_skip(pb, 2 * 4);
556 avih_width = avio_rl32(pb);
557 avih_height = avio_rl32(pb);
559 avio_skip(pb, size - 10 * 4);
561 case MKTAG('s', 't', 'r', 'h'):
564 tag1 = avio_rl32(pb);
565 handler = avio_rl32(pb); /* codec tag */
567 if (tag1 == MKTAG('p', 'a', 'd', 's')) {
568 avio_skip(pb, size - 8);
572 st = avformat_new_stream(s, NULL);
576 st->id = stream_index;
577 ast = av_mallocz(sizeof(AVIStream));
583 tag1 = stream_index ? MKTAG('a', 'u', 'd', 's')
584 : MKTAG('v', 'i', 'd', 's');
586 print_tag(s, "strh", tag1, -1);
588 if (tag1 == MKTAG('i', 'a', 'v', 's') ||
589 tag1 == MKTAG('i', 'v', 'a', 's')) {
592 /* After some consideration -- I don't think we
593 * have to support anything but DV in type1 AVIs. */
594 if (s->nb_streams != 1)
597 if (handler != MKTAG('d', 'v', 's', 'd') &&
598 handler != MKTAG('d', 'v', 'h', 'd') &&
599 handler != MKTAG('d', 'v', 's', 'l'))
602 ast = s->streams[0]->priv_data;
603 av_freep(&s->streams[0]->codecpar->extradata);
604 av_freep(&s->streams[0]->codecpar);
605 #if FF_API_LAVF_AVCTX
606 FF_DISABLE_DEPRECATION_WARNINGS
607 av_freep(&s->streams[0]->codec);
608 FF_ENABLE_DEPRECATION_WARNINGS
610 if (s->streams[0]->info)
611 av_freep(&s->streams[0]->info->duration_error);
612 av_freep(&s->streams[0]->info);
613 if (s->streams[0]->internal)
614 av_freep(&s->streams[0]->internal->avctx);
615 av_freep(&s->streams[0]->internal);
616 av_freep(&s->streams[0]);
618 if (CONFIG_DV_DEMUXER) {
619 avi->dv_demux = avpriv_dv_init_demux(s);
624 s->streams[0]->priv_data = ast;
625 avio_skip(pb, 3 * 4);
626 ast->scale = avio_rl32(pb);
627 ast->rate = avio_rl32(pb);
628 avio_skip(pb, 4); /* start time */
630 dv_dur = avio_rl32(pb);
631 if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
632 dv_dur *= AV_TIME_BASE;
633 s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
635 /* else, leave duration alone; timing estimation in utils.c
636 * will make a guess based on bitrate. */
638 stream_index = s->nb_streams - 1;
639 avio_skip(pb, size - 9 * 4);
643 av_assert0(stream_index < s->nb_streams);
644 ast->handler = handler;
646 avio_rl32(pb); /* flags */
647 avio_rl16(pb); /* priority */
648 avio_rl16(pb); /* language */
649 avio_rl32(pb); /* initial frame */
650 ast->scale = avio_rl32(pb);
651 ast->rate = avio_rl32(pb);
652 if (!(ast->scale && ast->rate)) {
653 av_log(s, AV_LOG_WARNING,
654 "scale/rate is %"PRIu32"/%"PRIu32" which is invalid. "
655 "(This file has been generated by broken software.)\n",
660 ast->scale = frame_period;
666 avpriv_set_pts_info(st, 64, ast->scale, ast->rate);
668 ast->cum_len = avio_rl32(pb); /* start */
669 st->nb_frames = avio_rl32(pb);
672 avio_rl32(pb); /* buffer size */
673 avio_rl32(pb); /* quality */
674 if (ast->cum_len > 3600LL * ast->rate / ast->scale) {
675 av_log(s, AV_LOG_ERROR, "crazy start time, iam scared, giving up\n");
678 ast->sample_size = avio_rl32(pb);
679 ast->cum_len *= FFMAX(1, ast->sample_size);
680 av_log(s, AV_LOG_TRACE, "%"PRIu32" %"PRIu32" %d\n",
681 ast->rate, ast->scale, ast->sample_size);
684 case MKTAG('v', 'i', 'd', 's'):
685 codec_type = AVMEDIA_TYPE_VIDEO;
687 ast->sample_size = 0;
688 st->avg_frame_rate = av_inv_q(st->time_base);
690 case MKTAG('a', 'u', 'd', 's'):
691 codec_type = AVMEDIA_TYPE_AUDIO;
693 case MKTAG('t', 'x', 't', 's'):
694 codec_type = AVMEDIA_TYPE_SUBTITLE;
696 case MKTAG('d', 'a', 't', 's'):
697 codec_type = AVMEDIA_TYPE_DATA;
700 av_log(s, AV_LOG_INFO, "unknown stream type %X\n", tag1);
703 if (ast->sample_size < 0) {
704 if (s->error_recognition & AV_EF_EXPLODE) {
705 av_log(s, AV_LOG_ERROR,
706 "Invalid sample_size %d at stream %d\n",
711 av_log(s, AV_LOG_WARNING,
712 "Invalid sample_size %d at stream %d "
716 ast->sample_size = 0;
719 if (ast->sample_size == 0) {
720 st->duration = st->nb_frames;
721 if (st->duration > 0 && avi->io_fsize > 0 && avi->riff_end > avi->io_fsize) {
722 av_log(s, AV_LOG_DEBUG, "File is truncated adjusting duration\n");
723 st->duration = av_rescale(st->duration, avi->io_fsize, avi->riff_end);
726 ast->frame_offset = ast->cum_len;
727 avio_skip(pb, size - 12 * 4);
729 case MKTAG('s', 't', 'r', 'f'):
731 if (!size && (codec_type == AVMEDIA_TYPE_AUDIO ||
732 codec_type == AVMEDIA_TYPE_VIDEO))
734 if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
737 uint64_t cur_pos = avio_tell(pb);
739 if (cur_pos < list_end)
740 size = FFMIN(size, list_end - cur_pos);
741 st = s->streams[stream_index];
742 if (st->codecpar->codec_type != AVMEDIA_TYPE_UNKNOWN) {
746 switch (codec_type) {
747 case AVMEDIA_TYPE_VIDEO:
748 if (amv_file_format) {
749 st->codecpar->width = avih_width;
750 st->codecpar->height = avih_height;
751 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
752 st->codecpar->codec_id = AV_CODEC_ID_AMV;
756 tag1 = ff_get_bmp_header(pb, st, &esize);
758 if (tag1 == MKTAG('D', 'X', 'S', 'B') ||
759 tag1 == MKTAG('D', 'X', 'S', 'A')) {
760 st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
761 st->codecpar->codec_tag = tag1;
762 st->codecpar->codec_id = AV_CODEC_ID_XSUB;
766 if (size > 10 * 4 && size < (1 << 30) && size < avi->fsize) {
767 if (esize == size-1 && (esize&1)) {
768 st->codecpar->extradata_size = esize - 10 * 4;
770 st->codecpar->extradata_size = size - 10 * 4;
771 if (st->codecpar->extradata) {
772 av_log(s, AV_LOG_WARNING, "New extradata in strf chunk, freeing previous one.\n");
773 av_freep(&st->codecpar->extradata);
775 if (ff_get_extradata(s, st->codecpar, pb, st->codecpar->extradata_size) < 0)
776 return AVERROR(ENOMEM);
779 // FIXME: check if the encoder really did this correctly
780 if (st->codecpar->extradata_size & 1)
783 /* Extract palette from extradata if bpp <= 8.
784 * This code assumes that extradata contains only palette.
785 * This is true for all paletted codecs implemented in
787 if (st->codecpar->extradata_size &&
788 (st->codecpar->bits_per_coded_sample <= 8)) {
789 int pal_size = (1 << st->codecpar->bits_per_coded_sample) << 2;
790 const uint8_t *pal_src;
792 pal_size = FFMIN(pal_size, st->codecpar->extradata_size);
793 pal_src = st->codecpar->extradata +
794 st->codecpar->extradata_size - pal_size;
795 /* Exclude the "BottomUp" field from the palette */
796 if (pal_src - st->codecpar->extradata >= 9 &&
797 !memcmp(st->codecpar->extradata + st->codecpar->extradata_size - 9, "BottomUp", 9))
799 for (i = 0; i < pal_size / 4; i++)
800 ast->pal[i] = 0xFFU<<24 | AV_RL32(pal_src + 4 * i);
804 print_tag(s, "video", tag1, 0);
806 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
807 st->codecpar->codec_tag = tag1;
808 st->codecpar->codec_id = ff_codec_get_id(ff_codec_bmp_tags,
810 /* If codec is not found yet, try with the mov tags. */
811 if (!st->codecpar->codec_id) {
812 st->codecpar->codec_id =
813 ff_codec_get_id(ff_codec_movvideo_tags, tag1);
814 if (st->codecpar->codec_id)
815 av_log(s, AV_LOG_WARNING,
816 "mov tag found in avi (fourcc %s)\n",
817 av_fourcc2str(tag1));
819 if (!st->codecpar->codec_id)
820 st->codecpar->codec_id = ff_codec_get_id(ff_codec_bmp_tags_unofficial, tag1);
822 /* This is needed to get the pict type which is necessary
823 * for generating correct pts. */
824 st->need_parsing = AVSTREAM_PARSE_HEADERS;
826 if (st->codecpar->codec_id == AV_CODEC_ID_MPEG4 &&
827 ast->handler == MKTAG('X', 'V', 'I', 'D'))
828 st->codecpar->codec_tag = MKTAG('X', 'V', 'I', 'D');
830 if (st->codecpar->codec_tag == MKTAG('V', 'S', 'S', 'H'))
831 st->need_parsing = AVSTREAM_PARSE_FULL;
832 if (st->codecpar->codec_id == AV_CODEC_ID_RV40)
833 st->need_parsing = AVSTREAM_PARSE_NONE;
835 if (st->codecpar->codec_tag == 0 && st->codecpar->height > 0 &&
836 st->codecpar->extradata_size < 1U << 30) {
837 st->codecpar->extradata_size += 9;
838 if ((ret = av_reallocp(&st->codecpar->extradata,
839 st->codecpar->extradata_size +
840 AV_INPUT_BUFFER_PADDING_SIZE)) < 0) {
841 st->codecpar->extradata_size = 0;
844 memcpy(st->codecpar->extradata + st->codecpar->extradata_size - 9,
847 st->codecpar->height = FFABS(st->codecpar->height);
849 // avio_skip(pb, size - 5 * 4);
851 case AVMEDIA_TYPE_AUDIO:
852 ret = ff_get_wav_header(s, pb, st->codecpar, size, 0);
855 ast->dshow_block_align = st->codecpar->block_align;
856 if (ast->sample_size && st->codecpar->block_align &&
857 ast->sample_size != st->codecpar->block_align) {
860 "sample size (%d) != block align (%d)\n",
862 st->codecpar->block_align);
863 ast->sample_size = st->codecpar->block_align;
866 * (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
869 /* Force parsing as several audio frames can be in
870 * one packet and timestamps refer to packet start. */
871 st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
872 /* ADTS header is in extradata, AAC without header must be
873 * stored as exact frames. Parser not needed and it will
875 if (st->codecpar->codec_id == AV_CODEC_ID_AAC &&
876 st->codecpar->extradata_size)
877 st->need_parsing = AVSTREAM_PARSE_NONE;
878 // The flac parser does not work with AVSTREAM_PARSE_TIMESTAMPS
879 if (st->codecpar->codec_id == AV_CODEC_ID_FLAC)
880 st->need_parsing = AVSTREAM_PARSE_NONE;
881 /* AVI files with Xan DPCM audio (wrongly) declare PCM
882 * audio in the header but have Axan as stream_code_tag. */
883 if (ast->handler == AV_RL32("Axan")) {
884 st->codecpar->codec_id = AV_CODEC_ID_XAN_DPCM;
885 st->codecpar->codec_tag = 0;
886 ast->dshow_block_align = 0;
888 if (amv_file_format) {
889 st->codecpar->codec_id = AV_CODEC_ID_ADPCM_IMA_AMV;
890 ast->dshow_block_align = 0;
892 if ((st->codecpar->codec_id == AV_CODEC_ID_AAC ||
893 st->codecpar->codec_id == AV_CODEC_ID_FLAC ||
894 st->codecpar->codec_id == AV_CODEC_ID_MP2 ) && ast->dshow_block_align <= 4 && ast->dshow_block_align) {
895 av_log(s, AV_LOG_DEBUG, "overriding invalid dshow_block_align of %d\n", ast->dshow_block_align);
896 ast->dshow_block_align = 0;
898 if (st->codecpar->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align == 1024 && ast->sample_size == 1024 ||
899 st->codecpar->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align == 4096 && ast->sample_size == 4096 ||
900 st->codecpar->codec_id == AV_CODEC_ID_MP3 && ast->dshow_block_align == 1152 && ast->sample_size == 1152) {
901 av_log(s, AV_LOG_DEBUG, "overriding sample_size\n");
902 ast->sample_size = 0;
905 case AVMEDIA_TYPE_SUBTITLE:
906 st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
907 st->request_probe= 1;
911 st->codecpar->codec_type = AVMEDIA_TYPE_DATA;
912 st->codecpar->codec_id = AV_CODEC_ID_NONE;
913 st->codecpar->codec_tag = 0;
919 case MKTAG('s', 't', 'r', 'd'):
920 if (stream_index >= (unsigned)s->nb_streams
921 || s->streams[stream_index]->codecpar->extradata_size
922 || s->streams[stream_index]->codecpar->codec_tag == MKTAG('H','2','6','4')) {
925 uint64_t cur_pos = avio_tell(pb);
926 if (cur_pos < list_end)
927 size = FFMIN(size, list_end - cur_pos);
928 st = s->streams[stream_index];
931 if (st->codecpar->extradata) {
932 av_log(s, AV_LOG_WARNING, "New extradata in strd chunk, freeing previous one.\n");
933 av_freep(&st->codecpar->extradata);
935 if (ff_get_extradata(s, st->codecpar, pb, size) < 0)
936 return AVERROR(ENOMEM);
939 if (st->codecpar->extradata_size & 1) //FIXME check if the encoder really did this correctly
942 ret = avi_extract_stream_metadata(s, st);
944 av_log(s, AV_LOG_WARNING, "could not decoding EXIF data in stream header.\n");
948 case MKTAG('i', 'n', 'd', 'x'):
950 if ((pb->seekable & AVIO_SEEKABLE_NORMAL) && !(s->flags & AVFMT_FLAG_IGNIDX) &&
952 read_odml_index(s, 0) < 0 &&
953 (s->error_recognition & AV_EF_EXPLODE))
955 avio_seek(pb, pos + size, SEEK_SET);
957 case MKTAG('v', 'p', 'r', 'p'):
958 if (stream_index < (unsigned)s->nb_streams && size > 9 * 4) {
959 AVRational active, active_aspect;
961 st = s->streams[stream_index];
968 active_aspect.den = avio_rl16(pb);
969 active_aspect.num = avio_rl16(pb);
970 active.num = avio_rl32(pb);
971 active.den = avio_rl32(pb);
972 avio_rl32(pb); // nbFieldsPerFrame
974 if (active_aspect.num && active_aspect.den &&
975 active.num && active.den) {
976 st->sample_aspect_ratio = av_div_q(active_aspect, active);
977 av_log(s, AV_LOG_TRACE, "vprp %d/%d %d/%d\n",
978 active_aspect.num, active_aspect.den,
979 active.num, active.den);
985 case MKTAG('s', 't', 'r', 'n'):
987 ret = avi_read_tag(s, s->streams[s->nb_streams - 1], tag, size);
993 if (size > 1000000) {
994 av_log(s, AV_LOG_ERROR,
995 "Something went wrong during header parsing, "
996 "tag %s has size %u, "
997 "I will ignore it and try to continue anyway.\n",
998 av_fourcc2str(tag), size);
999 if (s->error_recognition & AV_EF_EXPLODE)
1001 avi->movi_list = avio_tell(pb) - 4;
1002 avi->movi_end = avi->fsize;
1005 /* Do not fail for very large idx1 tags */
1006 case MKTAG('i', 'd', 'x', '1'):
1009 avio_skip(pb, size);
1015 /* check stream number */
1016 if (stream_index != s->nb_streams - 1) {
1019 return AVERROR_INVALIDDATA;
1022 if (!avi->index_loaded && (pb->seekable & AVIO_SEEKABLE_NORMAL))
1024 calculate_bitrate(s);
1025 avi->index_loaded |= 1;
1027 if ((ret = guess_ni_flag(s)) < 0)
1030 avi->non_interleaved |= ret | (s->flags & AVFMT_FLAG_SORT_DTS);
1032 dict_entry = av_dict_get(s->metadata, "ISFT", NULL, 0);
1033 if (dict_entry && !strcmp(dict_entry->value, "PotEncoder"))
1034 for (i = 0; i < s->nb_streams; i++) {
1035 AVStream *st = s->streams[i];
1036 if ( st->codecpar->codec_id == AV_CODEC_ID_MPEG1VIDEO
1037 || st->codecpar->codec_id == AV_CODEC_ID_MPEG2VIDEO)
1038 st->need_parsing = AVSTREAM_PARSE_FULL;
1041 for (i = 0; i < s->nb_streams; i++) {
1042 AVStream *st = s->streams[i];
1043 if (st->nb_index_entries)
1046 // DV-in-AVI cannot be non-interleaved, if set this must be
1049 avi->non_interleaved = 0;
1050 if (i == s->nb_streams && avi->non_interleaved) {
1051 av_log(s, AV_LOG_WARNING,
1052 "Non-interleaved AVI without index, switching to interleaved\n");
1053 avi->non_interleaved = 0;
1056 if (avi->non_interleaved) {
1057 av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
1061 ff_metadata_conv_ctx(s, NULL, avi_metadata_conv);
1062 ff_metadata_conv_ctx(s, NULL, ff_riff_info_conv);
1067 static int read_gab2_sub(AVFormatContext *s, AVStream *st, AVPacket *pkt)
1069 if (pkt->size >= 7 &&
1070 pkt->size < INT_MAX - AVPROBE_PADDING_SIZE &&
1071 !strcmp(pkt->data, "GAB2") && AV_RL16(pkt->data + 5) == 2) {
1073 int score = AVPROBE_SCORE_EXTENSION, ret;
1074 AVIStream *ast = st->priv_data;
1075 ff_const59 AVInputFormat *sub_demuxer;
1076 AVRational time_base;
1078 AVIOContext *pb = avio_alloc_context(pkt->data + 7,
1080 0, NULL, NULL, NULL, NULL);
1082 unsigned int desc_len = avio_rl32(pb);
1084 if (desc_len > pb->buf_end - pb->buf_ptr)
1087 ret = avio_get_str16le(pb, desc_len, desc, sizeof(desc));
1088 avio_skip(pb, desc_len - ret);
1090 av_dict_set(&st->metadata, "title", desc, 0);
1092 avio_rl16(pb); /* flags? */
1093 avio_rl32(pb); /* data size */
1095 size = pb->buf_end - pb->buf_ptr;
1096 pd = (AVProbeData) { .buf = av_mallocz(size + AVPROBE_PADDING_SIZE),
1100 memcpy(pd.buf, pb->buf_ptr, size);
1101 sub_demuxer = av_probe_input_format2(&pd, 1, &score);
1106 if (strcmp(sub_demuxer->name, "srt") && strcmp(sub_demuxer->name, "ass"))
1109 if (!(ast->sub_ctx = avformat_alloc_context()))
1112 ast->sub_ctx->pb = pb;
1114 if (ff_copy_whiteblacklists(ast->sub_ctx, s) < 0)
1117 if (!avformat_open_input(&ast->sub_ctx, "", sub_demuxer, NULL)) {
1118 if (ast->sub_ctx->nb_streams != 1)
1120 ff_read_packet(ast->sub_ctx, &ast->sub_pkt);
1121 avcodec_parameters_copy(st->codecpar, ast->sub_ctx->streams[0]->codecpar);
1122 time_base = ast->sub_ctx->streams[0]->time_base;
1123 avpriv_set_pts_info(st, 64, time_base.num, time_base.den);
1125 ast->sub_buffer = pkt->data;
1126 memset(pkt, 0, sizeof(*pkt));
1130 av_freep(&ast->sub_ctx);
1131 avio_context_free(&pb);
1136 static AVStream *get_subtitle_pkt(AVFormatContext *s, AVStream *next_st,
1139 AVIStream *ast, *next_ast = next_st->priv_data;
1140 int64_t ts, next_ts, ts_min = INT64_MAX;
1141 AVStream *st, *sub_st = NULL;
1144 next_ts = av_rescale_q(next_ast->frame_offset, next_st->time_base,
1147 for (i = 0; i < s->nb_streams; i++) {
1149 ast = st->priv_data;
1150 if (st->discard < AVDISCARD_ALL && ast && ast->sub_pkt.data) {
1151 ts = av_rescale_q(ast->sub_pkt.dts, st->time_base, AV_TIME_BASE_Q);
1152 if (ts <= next_ts && ts < ts_min) {
1160 ast = sub_st->priv_data;
1161 *pkt = ast->sub_pkt;
1162 pkt->stream_index = sub_st->index;
1164 if (ff_read_packet(ast->sub_ctx, &ast->sub_pkt) < 0)
1165 ast->sub_pkt.data = NULL;
1170 static int get_stream_idx(const unsigned *d)
1172 if (d[0] >= '0' && d[0] <= '9' &&
1173 d[1] >= '0' && d[1] <= '9') {
1174 return (d[0] - '0') * 10 + (d[1] - '0');
1176 return 100; // invalid stream ID
1182 * @param exit_early set to 1 to just gather packet position without making the changes needed to actually read & return the packet
1184 static int avi_sync(AVFormatContext *s, int exit_early)
1186 AVIContext *avi = s->priv_data;
1187 AVIOContext *pb = s->pb;
1194 memset(d, -1, sizeof(d));
1195 for (i = sync = avio_tell(pb); !avio_feof(pb); i++) {
1198 for (j = 0; j < 7; j++)
1202 size = d[4] + (d[5] << 8) + (d[6] << 16) + (d[7] << 24);
1204 n = get_stream_idx(d + 2);
1205 ff_tlog(s, "%X %X %X %X %X %X %X %X %"PRId64" %u %d\n",
1206 d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], i, size, n);
1207 if (i*(avi->io_fsize>0) + (uint64_t)size > avi->fsize || d[0] > 127)
1211 if ((d[0] == 'i' && d[1] == 'x' && n < s->nb_streams) ||
1213 (d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K') ||
1214 (d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1') ||
1215 (d[0] == 'i' && d[1] == 'n' && d[2] == 'd' && d[3] == 'x')) {
1216 avio_skip(pb, size);
1221 if (d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T') {
1226 n = get_stream_idx(d);
1228 if (!((i - avi->last_pkt_pos) & 1) &&
1229 get_stream_idx(d + 1) < s->nb_streams)
1232 // detect ##ix chunk and skip
1233 if (d[2] == 'i' && d[3] == 'x' && n < s->nb_streams) {
1234 avio_skip(pb, size);
1238 if (d[2] == 'w' && d[3] == 'c' && n < s->nb_streams) {
1239 avio_skip(pb, 16 * 3 + 8);
1243 if (avi->dv_demux && n != 0)
1247 if (n < s->nb_streams) {
1251 ast = st->priv_data;
1254 av_log(s, AV_LOG_WARNING, "Skipping foreign stream %d packet\n", n);
1258 if (s->nb_streams >= 2) {
1259 AVStream *st1 = s->streams[1];
1260 AVIStream *ast1 = st1->priv_data;
1261 // workaround for broken small-file-bug402.avi
1262 if ( d[2] == 'w' && d[3] == 'b'
1264 && st ->codecpar->codec_type == AVMEDIA_TYPE_VIDEO
1265 && st1->codecpar->codec_type == AVMEDIA_TYPE_AUDIO
1266 && ast->prefix == 'd'*256+'c'
1267 && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
1272 av_log(s, AV_LOG_WARNING,
1273 "Invalid stream + prefix combination, assuming audio.\n");
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 if (!avi->dv_demux &&
1304 ((st->discard >= AVDISCARD_DEFAULT && size == 0) /* ||
1305 // FIXME: needs a little reordering
1306 (st->discard >= AVDISCARD_NONKEY &&
1307 !(pkt->flags & AV_PKT_FLAG_KEY)) */
1308 || st->discard >= AVDISCARD_ALL)) {
1310 ast->frame_offset += get_duration(ast, size);
1311 avio_skip(pb, size);
1315 avi->stream_index = n;
1316 ast->packet_size = size + 8;
1317 ast->remaining = size;
1320 uint64_t pos = avio_tell(pb) - 8;
1321 if (!st->index_entries || !st->nb_index_entries ||
1322 st->index_entries[st->nb_index_entries - 1].pos < pos) {
1323 av_add_index_entry(st, pos, ast->frame_offset, size,
1324 0, AVINDEX_KEYFRAME);
1337 static int ni_prepare_read(AVFormatContext *s)
1339 AVIContext *avi = s->priv_data;
1340 int best_stream_index = 0;
1341 AVStream *best_st = NULL;
1342 AVIStream *best_ast;
1343 int64_t best_ts = INT64_MAX;
1346 for (i = 0; i < s->nb_streams; i++) {
1347 AVStream *st = s->streams[i];
1348 AVIStream *ast = st->priv_data;
1349 int64_t ts = ast->frame_offset;
1352 if (!st->nb_index_entries)
1355 last_ts = st->index_entries[st->nb_index_entries - 1].timestamp;
1356 if (!ast->remaining && ts > last_ts)
1359 ts = av_rescale_q(ts, st->time_base,
1360 (AVRational) { FFMAX(1, ast->sample_size),
1363 av_log(s, AV_LOG_TRACE, "%"PRId64" %d/%d %"PRId64"\n", ts,
1364 st->time_base.num, st->time_base.den, ast->frame_offset);
1368 best_stream_index = i;
1374 best_ast = best_st->priv_data;
1375 best_ts = best_ast->frame_offset;
1376 if (best_ast->remaining) {
1377 i = av_index_search_timestamp(best_st,
1380 AVSEEK_FLAG_BACKWARD);
1382 i = av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
1384 best_ast->frame_offset = best_st->index_entries[i].timestamp;
1388 int64_t pos = best_st->index_entries[i].pos;
1389 pos += best_ast->packet_size - best_ast->remaining;
1390 if (avio_seek(s->pb, pos + 8, SEEK_SET) < 0)
1393 av_assert0(best_ast->remaining <= best_ast->packet_size);
1395 avi->stream_index = best_stream_index;
1396 if (!best_ast->remaining)
1397 best_ast->packet_size =
1398 best_ast->remaining = best_st->index_entries[i].size;
1406 static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
1408 AVIContext *avi = s->priv_data;
1409 AVIOContext *pb = s->pb;
1412 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1413 int size = avpriv_dv_get_packet(avi->dv_demux, pkt);
1420 if (avi->non_interleaved) {
1421 err = ni_prepare_read(s);
1427 if (avi->stream_index >= 0) {
1428 AVStream *st = s->streams[avi->stream_index];
1429 AVIStream *ast = st->priv_data;
1432 if (get_subtitle_pkt(s, st, pkt))
1435 // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
1436 if (ast->sample_size <= 1)
1438 else if (ast->sample_size < 32)
1439 // arbitrary multiplier to avoid tiny packets for raw PCM data
1440 size = 1024 * ast->sample_size;
1442 size = ast->sample_size;
1444 if (size > ast->remaining)
1445 size = ast->remaining;
1446 avi->last_pkt_pos = avio_tell(pb);
1447 err = av_get_packet(pb, pkt, size);
1452 if (ast->has_pal && pkt->size < (unsigned)INT_MAX / 2) {
1454 pal = av_packet_new_side_data(pkt,
1455 AV_PKT_DATA_PALETTE,
1458 av_log(s, AV_LOG_ERROR,
1459 "Failed to allocate data for palette\n");
1461 memcpy(pal, ast->pal, AVPALETTE_SIZE);
1466 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1467 AVBufferRef *avbuf = pkt->buf;
1468 size = avpriv_dv_produce_packet(avi->dv_demux, pkt,
1469 pkt->data, pkt->size, pkt->pos);
1471 pkt->flags |= AV_PKT_FLAG_KEY;
1473 av_packet_unref(pkt);
1474 } else if (st->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE &&
1475 !st->codecpar->codec_tag && read_gab2_sub(s, st, pkt)) {
1476 ast->frame_offset++;
1477 avi->stream_index = -1;
1481 /* XXX: How to handle B-frames in AVI? */
1482 pkt->dts = ast->frame_offset;
1483 // pkt->dts += ast->start;
1484 if (ast->sample_size)
1485 pkt->dts /= ast->sample_size;
1486 pkt->stream_index = avi->stream_index;
1488 if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && st->index_entries) {
1492 index = av_index_search_timestamp(st, ast->frame_offset, AVSEEK_FLAG_ANY);
1493 e = &st->index_entries[index];
1495 if (index >= 0 && e->timestamp == ast->frame_offset) {
1496 if (index == st->nb_index_entries-1) {
1499 if (st->codecpar->codec_id == AV_CODEC_ID_MPEG4) {
1500 const uint8_t *ptr = pkt->data, *end = ptr + FFMIN(size, 256);
1502 ptr = avpriv_find_start_code(ptr, end, &state);
1503 if (state == 0x1B6 && ptr < end) {
1504 key = !(*ptr & 0xC0);
1510 e->flags &= ~AVINDEX_KEYFRAME;
1512 if (e->flags & AVINDEX_KEYFRAME)
1513 pkt->flags |= AV_PKT_FLAG_KEY;
1516 pkt->flags |= AV_PKT_FLAG_KEY;
1518 ast->frame_offset += get_duration(ast, pkt->size);
1520 ast->remaining -= err;
1521 if (!ast->remaining) {
1522 avi->stream_index = -1;
1523 ast->packet_size = 0;
1526 if (!avi->non_interleaved && pkt->pos >= 0 && ast->seek_pos > pkt->pos) {
1527 av_packet_unref(pkt);
1532 if (!avi->non_interleaved && st->nb_index_entries>1 && avi->index_loaded>1) {
1533 int64_t dts= av_rescale_q(pkt->dts, st->time_base, AV_TIME_BASE_Q);
1535 if (avi->dts_max - dts > 2*AV_TIME_BASE) {
1536 avi->non_interleaved= 1;
1537 av_log(s, AV_LOG_INFO, "Switching to NI mode, due to poor interleaving\n");
1538 }else if (avi->dts_max < dts)
1545 if ((err = avi_sync(s, 0)) < 0)
1550 /* XXX: We make the implicit supposition that the positions are sorted
1551 * for each stream. */
1552 static int avi_read_idx1(AVFormatContext *s, int size)
1554 AVIContext *avi = s->priv_data;
1555 AVIOContext *pb = s->pb;
1556 int nb_index_entries, i;
1560 unsigned int index, tag, flags, len, first_packet = 1;
1561 int64_t last_pos = -1;
1562 unsigned last_idx = -1;
1563 int64_t idx1_pos, first_packet_pos = 0, data_offset = 0;
1566 nb_index_entries = size / 16;
1567 if (nb_index_entries <= 0)
1568 return AVERROR_INVALIDDATA;
1570 idx1_pos = avio_tell(pb);
1571 avio_seek(pb, avi->movi_list + 4, SEEK_SET);
1572 if (avi_sync(s, 1) == 0)
1573 first_packet_pos = avio_tell(pb) - 8;
1574 avi->stream_index = -1;
1575 avio_seek(pb, idx1_pos, SEEK_SET);
1577 if (s->nb_streams == 1 && s->streams[0]->codecpar->codec_tag == AV_RL32("MMES")) {
1578 first_packet_pos = 0;
1579 data_offset = avi->movi_list;
1582 /* Read the entries and sort them in each stream component. */
1583 for (i = 0; i < nb_index_entries; i++) {
1587 tag = avio_rl32(pb);
1588 flags = avio_rl32(pb);
1589 pos = avio_rl32(pb);
1590 len = avio_rl32(pb);
1591 av_log(s, AV_LOG_TRACE, "%d: tag=0x%x flags=0x%x pos=0x%"PRIx64" len=%d/",
1592 i, tag, flags, pos, len);
1594 index = ((tag & 0xff) - '0') * 10;
1595 index += (tag >> 8 & 0xff) - '0';
1596 if (index >= s->nb_streams)
1598 st = s->streams[index];
1599 ast = st->priv_data;
1601 /* Skip 'xxpc' palette change entries in the index until a logic
1602 * to process these is properly implemented. */
1603 if ((tag >> 16 & 0xff) == 'p' && (tag >> 24 & 0xff) == 'c')
1606 if (first_packet && first_packet_pos) {
1607 if (avi->movi_list + 4 != pos || pos + 500 > first_packet_pos)
1608 data_offset = first_packet_pos - pos;
1613 av_log(s, AV_LOG_TRACE, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
1615 // even if we have only a single stream, we should
1616 // switch to non-interleaved to get correct timestamps
1617 if (last_pos == pos)
1618 avi->non_interleaved = 1;
1619 if (last_idx != pos && len) {
1620 av_add_index_entry(st, pos, ast->cum_len, len, 0,
1621 (flags & AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
1624 ast->cum_len += get_duration(ast, len);
1626 anykey |= flags&AVIIF_INDEX;
1629 for (index = 0; index < s->nb_streams; index++) {
1630 st = s->streams[index];
1631 if (st->nb_index_entries)
1632 st->index_entries[0].flags |= AVINDEX_KEYFRAME;
1638 /* Scan the index and consider any file with streams more than
1639 * 2 seconds or 64MB apart non-interleaved. */
1640 static int check_stream_max_drift(AVFormatContext *s)
1642 int64_t min_pos, pos;
1644 int *idx = av_mallocz_array(s->nb_streams, sizeof(*idx));
1646 return AVERROR(ENOMEM);
1647 for (min_pos = pos = 0; min_pos != INT64_MAX; pos = min_pos + 1LU) {
1648 int64_t max_dts = INT64_MIN / 2;
1649 int64_t min_dts = INT64_MAX / 2;
1650 int64_t max_buffer = 0;
1652 min_pos = INT64_MAX;
1654 for (i = 0; i < s->nb_streams; i++) {
1655 AVStream *st = s->streams[i];
1656 AVIStream *ast = st->priv_data;
1657 int n = st->nb_index_entries;
1658 while (idx[i] < n && st->index_entries[idx[i]].pos < pos)
1662 dts = av_rescale_q(st->index_entries[idx[i]].timestamp /
1663 FFMAX(ast->sample_size, 1),
1664 st->time_base, AV_TIME_BASE_Q);
1665 min_dts = FFMIN(min_dts, dts);
1666 min_pos = FFMIN(min_pos, st->index_entries[idx[i]].pos);
1669 for (i = 0; i < s->nb_streams; i++) {
1670 AVStream *st = s->streams[i];
1671 AVIStream *ast = st->priv_data;
1673 if (idx[i] && min_dts != INT64_MAX / 2) {
1675 dts = av_rescale_q(st->index_entries[idx[i] - 1].timestamp /
1676 FFMAX(ast->sample_size, 1),
1677 st->time_base, AV_TIME_BASE_Q);
1678 max_dts = FFMAX(max_dts, dts);
1679 max_buffer = FFMAX(max_buffer,
1680 av_rescale(dts - min_dts,
1681 st->codecpar->bit_rate,
1685 if (max_dts - min_dts > 2 * AV_TIME_BASE ||
1686 max_buffer > 1024 * 1024 * 8 * 8) {
1695 static int guess_ni_flag(AVFormatContext *s)
1698 int64_t last_start = 0;
1699 int64_t first_end = INT64_MAX;
1700 int64_t oldpos = avio_tell(s->pb);
1702 for (i = 0; i < s->nb_streams; i++) {
1703 AVStream *st = s->streams[i];
1704 int n = st->nb_index_entries;
1711 int64_t pos = st->index_entries[0].pos;
1713 avio_seek(s->pb, pos, SEEK_SET);
1714 tag[0] = avio_r8(s->pb);
1715 tag[1] = avio_r8(s->pb);
1717 size = avio_rl32(s->pb);
1718 if (get_stream_idx(tag) == i && pos + size > st->index_entries[1].pos)
1719 last_start = INT64_MAX;
1720 if (get_stream_idx(tag) == i && size == st->index_entries[0].size + 8)
1721 last_start = INT64_MAX;
1724 if (st->index_entries[0].pos > last_start)
1725 last_start = st->index_entries[0].pos;
1726 if (st->index_entries[n - 1].pos < first_end)
1727 first_end = st->index_entries[n - 1].pos;
1729 avio_seek(s->pb, oldpos, SEEK_SET);
1731 if (last_start > first_end)
1734 return check_stream_max_drift(s);
1737 static int avi_load_index(AVFormatContext *s)
1739 AVIContext *avi = s->priv_data;
1740 AVIOContext *pb = s->pb;
1742 int64_t pos = avio_tell(pb);
1746 if (avio_seek(pb, avi->movi_end, SEEK_SET) < 0)
1747 goto the_end; // maybe truncated file
1748 av_log(s, AV_LOG_TRACE, "movi_end=0x%"PRIx64"\n", avi->movi_end);
1750 tag = avio_rl32(pb);
1751 size = avio_rl32(pb);
1754 next = avio_tell(pb) + size + (size & 1);
1756 if (tag == MKTAG('i', 'd', 'x', '1') &&
1757 avi_read_idx1(s, size) >= 0) {
1758 avi->index_loaded=2;
1760 }else if (tag == MKTAG('L', 'I', 'S', 'T')) {
1761 uint32_t tag1 = avio_rl32(pb);
1763 if (tag1 == MKTAG('I', 'N', 'F', 'O'))
1764 ff_read_riff_info(s, size - 4);
1768 if (avio_seek(pb, next, SEEK_SET) < 0)
1769 break; // something is wrong here
1773 avio_seek(pb, pos, SEEK_SET);
1777 static void seek_subtitle(AVStream *st, AVStream *st2, int64_t timestamp)
1779 AVIStream *ast2 = st2->priv_data;
1780 int64_t ts2 = av_rescale_q(timestamp, st->time_base, st2->time_base);
1781 av_packet_unref(&ast2->sub_pkt);
1782 if (avformat_seek_file(ast2->sub_ctx, 0, INT64_MIN, ts2, ts2, 0) >= 0 ||
1783 avformat_seek_file(ast2->sub_ctx, 0, ts2, ts2, INT64_MAX, 0) >= 0)
1784 ff_read_packet(ast2->sub_ctx, &ast2->sub_pkt);
1787 static int avi_read_seek(AVFormatContext *s, int stream_index,
1788 int64_t timestamp, int flags)
1790 AVIContext *avi = s->priv_data;
1793 int64_t pos, pos_min;
1796 /* Does not matter which stream is requested dv in avi has the
1797 * stream information in the first video stream.
1802 if (!avi->index_loaded) {
1803 /* we only load the index on demand */
1805 avi->index_loaded |= 1;
1807 av_assert0(stream_index >= 0);
1809 st = s->streams[stream_index];
1810 ast = st->priv_data;
1811 index = av_index_search_timestamp(st,
1812 timestamp * FFMAX(ast->sample_size, 1),
1815 if (st->nb_index_entries > 0)
1816 av_log(s, AV_LOG_DEBUG, "Failed to find timestamp %"PRId64 " in index %"PRId64 " .. %"PRId64 "\n",
1817 timestamp * FFMAX(ast->sample_size, 1),
1818 st->index_entries[0].timestamp,
1819 st->index_entries[st->nb_index_entries - 1].timestamp);
1820 return AVERROR_INVALIDDATA;
1823 /* find the position */
1824 pos = st->index_entries[index].pos;
1825 timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1);
1827 av_log(s, AV_LOG_TRACE, "XX %"PRId64" %d %"PRId64"\n",
1828 timestamp, index, st->index_entries[index].timestamp);
1830 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1831 /* One and only one real stream for DV in AVI, and it has video */
1832 /* offsets. Calling with other stream indexes should have failed */
1833 /* the av_index_search_timestamp call above. */
1835 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
1838 /* Feed the DV video stream version of the timestamp to the */
1839 /* DV demux so it can synthesize correct timestamps. */
1840 ff_dv_offset_reset(avi->dv_demux, timestamp);
1842 avi->stream_index = -1;
1847 for (i = 0; i < s->nb_streams; i++) {
1848 AVStream *st2 = s->streams[i];
1849 AVIStream *ast2 = st2->priv_data;
1852 ast2->remaining = 0;
1854 if (ast2->sub_ctx) {
1855 seek_subtitle(st, st2, timestamp);
1859 if (st2->nb_index_entries <= 0)
1862 // av_assert1(st2->codecpar->block_align);
1863 index = av_index_search_timestamp(st2,
1864 av_rescale_q(timestamp,
1867 FFMAX(ast2->sample_size, 1),
1869 AVSEEK_FLAG_BACKWARD |
1870 (st2->codecpar->codec_type != AVMEDIA_TYPE_VIDEO ? AVSEEK_FLAG_ANY : 0));
1873 ast2->seek_pos = st2->index_entries[index].pos;
1874 pos_min = FFMIN(pos_min,ast2->seek_pos);
1876 for (i = 0; i < s->nb_streams; i++) {
1877 AVStream *st2 = s->streams[i];
1878 AVIStream *ast2 = st2->priv_data;
1880 if (ast2->sub_ctx || st2->nb_index_entries <= 0)
1883 index = av_index_search_timestamp(
1885 av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
1886 flags | AVSEEK_FLAG_BACKWARD | (st2->codecpar->codec_type != AVMEDIA_TYPE_VIDEO ? AVSEEK_FLAG_ANY : 0));
1889 while (!avi->non_interleaved && index>0 && st2->index_entries[index-1].pos >= pos_min)
1891 ast2->frame_offset = st2->index_entries[index].timestamp;
1895 if (avio_seek(s->pb, pos_min, SEEK_SET) < 0) {
1896 av_log(s, AV_LOG_ERROR, "Seek failed\n");
1899 avi->stream_index = -1;
1900 avi->dts_max = INT_MIN;
1904 static int avi_read_close(AVFormatContext *s)
1907 AVIContext *avi = s->priv_data;
1909 for (i = 0; i < s->nb_streams; i++) {
1910 AVStream *st = s->streams[i];
1911 AVIStream *ast = st->priv_data;
1914 av_freep(&ast->sub_ctx->pb);
1915 avformat_close_input(&ast->sub_ctx);
1917 av_freep(&ast->sub_buffer);
1918 av_packet_unref(&ast->sub_pkt);
1922 av_freep(&avi->dv_demux);
1927 static int avi_probe(const AVProbeData *p)
1931 /* check file header */
1932 for (i = 0; avi_headers[i][0]; i++)
1933 if (AV_RL32(p->buf ) == AV_RL32(avi_headers[i] ) &&
1934 AV_RL32(p->buf + 8) == AV_RL32(avi_headers[i] + 4))
1935 return AVPROBE_SCORE_MAX;
1940 AVInputFormat ff_avi_demuxer = {
1942 .long_name = NULL_IF_CONFIG_SMALL("AVI (Audio Video Interleaved)"),
1943 .priv_data_size = sizeof(AVIContext),
1944 .extensions = "avi",
1945 .read_probe = avi_probe,
1946 .read_header = avi_read_header,
1947 .read_packet = avi_read_packet,
1948 .read_close = avi_read_close,
1949 .read_seek = avi_read_seek,
1950 .priv_class = &demuxer_class,