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;
63 AVBufferRef *sub_buffer;
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 if (!CONFIG_DV_DEMUXER)
603 return AVERROR_DEMUXER_NOT_FOUND;
605 ast = s->streams[0]->priv_data;
606 st->priv_data = NULL;
607 ff_free_stream(s, st);
609 avi->dv_demux = avpriv_dv_init_demux(s);
610 if (!avi->dv_demux) {
612 return AVERROR(ENOMEM);
615 s->streams[0]->priv_data = ast;
616 avio_skip(pb, 3 * 4);
617 ast->scale = avio_rl32(pb);
618 ast->rate = avio_rl32(pb);
619 avio_skip(pb, 4); /* start time */
621 dv_dur = avio_rl32(pb);
622 if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
623 dv_dur *= AV_TIME_BASE;
624 s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
626 /* else, leave duration alone; timing estimation in utils.c
627 * will make a guess based on bitrate. */
629 stream_index = s->nb_streams - 1;
630 avio_skip(pb, size - 9 * 4);
634 av_assert0(stream_index < s->nb_streams);
635 ast->handler = handler;
637 avio_rl32(pb); /* flags */
638 avio_rl16(pb); /* priority */
639 avio_rl16(pb); /* language */
640 avio_rl32(pb); /* initial frame */
641 ast->scale = avio_rl32(pb);
642 ast->rate = avio_rl32(pb);
643 if (!(ast->scale && ast->rate)) {
644 av_log(s, AV_LOG_WARNING,
645 "scale/rate is %"PRIu32"/%"PRIu32" which is invalid. "
646 "(This file has been generated by broken software.)\n",
651 ast->scale = frame_period;
657 avpriv_set_pts_info(st, 64, ast->scale, ast->rate);
659 ast->cum_len = avio_rl32(pb); /* start */
660 st->nb_frames = avio_rl32(pb);
663 avio_rl32(pb); /* buffer size */
664 avio_rl32(pb); /* quality */
665 if (ast->cum_len > 3600LL * ast->rate / ast->scale) {
666 av_log(s, AV_LOG_ERROR, "crazy start time, iam scared, giving up\n");
669 ast->sample_size = avio_rl32(pb);
670 ast->cum_len *= FFMAX(1, ast->sample_size);
671 av_log(s, AV_LOG_TRACE, "%"PRIu32" %"PRIu32" %d\n",
672 ast->rate, ast->scale, ast->sample_size);
675 case MKTAG('v', 'i', 'd', 's'):
676 codec_type = AVMEDIA_TYPE_VIDEO;
678 ast->sample_size = 0;
679 st->avg_frame_rate = av_inv_q(st->time_base);
681 case MKTAG('a', 'u', 'd', 's'):
682 codec_type = AVMEDIA_TYPE_AUDIO;
684 case MKTAG('t', 'x', 't', 's'):
685 codec_type = AVMEDIA_TYPE_SUBTITLE;
687 case MKTAG('d', 'a', 't', 's'):
688 codec_type = AVMEDIA_TYPE_DATA;
691 av_log(s, AV_LOG_INFO, "unknown stream type %X\n", tag1);
694 if (ast->sample_size < 0) {
695 if (s->error_recognition & AV_EF_EXPLODE) {
696 av_log(s, AV_LOG_ERROR,
697 "Invalid sample_size %d at stream %d\n",
702 av_log(s, AV_LOG_WARNING,
703 "Invalid sample_size %d at stream %d "
707 ast->sample_size = 0;
710 if (ast->sample_size == 0) {
711 st->duration = st->nb_frames;
712 if (st->duration > 0 && avi->io_fsize > 0 && avi->riff_end > avi->io_fsize) {
713 av_log(s, AV_LOG_DEBUG, "File is truncated adjusting duration\n");
714 st->duration = av_rescale(st->duration, avi->io_fsize, avi->riff_end);
717 ast->frame_offset = ast->cum_len;
718 avio_skip(pb, size - 12 * 4);
720 case MKTAG('s', 't', 'r', 'f'):
722 if (!size && (codec_type == AVMEDIA_TYPE_AUDIO ||
723 codec_type == AVMEDIA_TYPE_VIDEO))
725 if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
728 uint64_t cur_pos = avio_tell(pb);
730 if (cur_pos < list_end)
731 size = FFMIN(size, list_end - cur_pos);
732 st = s->streams[stream_index];
733 if (st->codecpar->codec_type != AVMEDIA_TYPE_UNKNOWN) {
737 switch (codec_type) {
738 case AVMEDIA_TYPE_VIDEO:
739 if (amv_file_format) {
740 st->codecpar->width = avih_width;
741 st->codecpar->height = avih_height;
742 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
743 st->codecpar->codec_id = AV_CODEC_ID_AMV;
747 tag1 = ff_get_bmp_header(pb, st, &esize);
749 if (tag1 == MKTAG('D', 'X', 'S', 'B') ||
750 tag1 == MKTAG('D', 'X', 'S', 'A')) {
751 st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
752 st->codecpar->codec_tag = tag1;
753 st->codecpar->codec_id = AV_CODEC_ID_XSUB;
757 if (size > 10 * 4 && size < (1 << 30) && size < avi->fsize) {
758 if (esize == size-1 && (esize&1)) {
759 st->codecpar->extradata_size = esize - 10 * 4;
761 st->codecpar->extradata_size = size - 10 * 4;
762 if (st->codecpar->extradata) {
763 av_log(s, AV_LOG_WARNING, "New extradata in strf chunk, freeing previous one.\n");
765 ret = ff_get_extradata(s, st->codecpar, pb,
766 st->codecpar->extradata_size);
771 // FIXME: check if the encoder really did this correctly
772 if (st->codecpar->extradata_size & 1)
775 /* Extract palette from extradata if bpp <= 8.
776 * This code assumes that extradata contains only palette.
777 * This is true for all paletted codecs implemented in
779 if (st->codecpar->extradata_size &&
780 (st->codecpar->bits_per_coded_sample <= 8)) {
781 int pal_size = (1 << st->codecpar->bits_per_coded_sample) << 2;
782 const uint8_t *pal_src;
784 pal_size = FFMIN(pal_size, st->codecpar->extradata_size);
785 pal_src = st->codecpar->extradata +
786 st->codecpar->extradata_size - pal_size;
787 /* Exclude the "BottomUp" field from the palette */
788 if (pal_src - st->codecpar->extradata >= 9 &&
789 !memcmp(st->codecpar->extradata + st->codecpar->extradata_size - 9, "BottomUp", 9))
791 for (i = 0; i < pal_size / 4; i++)
792 ast->pal[i] = 0xFFU<<24 | AV_RL32(pal_src + 4 * i);
796 print_tag(s, "video", tag1, 0);
798 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
799 st->codecpar->codec_tag = tag1;
800 st->codecpar->codec_id = ff_codec_get_id(ff_codec_bmp_tags,
802 /* If codec is not found yet, try with the mov tags. */
803 if (!st->codecpar->codec_id) {
804 st->codecpar->codec_id =
805 ff_codec_get_id(ff_codec_movvideo_tags, tag1);
806 if (st->codecpar->codec_id)
807 av_log(s, AV_LOG_WARNING,
808 "mov tag found in avi (fourcc %s)\n",
809 av_fourcc2str(tag1));
811 if (!st->codecpar->codec_id)
812 st->codecpar->codec_id = ff_codec_get_id(ff_codec_bmp_tags_unofficial, tag1);
814 /* This is needed to get the pict type which is necessary
815 * for generating correct pts. */
816 st->need_parsing = AVSTREAM_PARSE_HEADERS;
818 if (st->codecpar->codec_id == AV_CODEC_ID_MPEG4 &&
819 ast->handler == MKTAG('X', 'V', 'I', 'D'))
820 st->codecpar->codec_tag = MKTAG('X', 'V', 'I', 'D');
822 if (st->codecpar->codec_tag == MKTAG('V', 'S', 'S', 'H'))
823 st->need_parsing = AVSTREAM_PARSE_FULL;
824 if (st->codecpar->codec_id == AV_CODEC_ID_RV40)
825 st->need_parsing = AVSTREAM_PARSE_NONE;
826 if (st->codecpar->codec_id == AV_CODEC_ID_HEVC &&
827 st->codecpar->codec_tag == MKTAG('H', '2', '6', '5'))
828 st->need_parsing = AVSTREAM_PARSE_FULL;
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");
929 if ((ret = ff_get_extradata(s, st->codecpar, pb, size)) < 0)
933 if (st->codecpar->extradata_size & 1) //FIXME check if the encoder really did this correctly
936 ret = avi_extract_stream_metadata(s, st);
938 av_log(s, AV_LOG_WARNING, "could not decoding EXIF data in stream header.\n");
942 case MKTAG('i', 'n', 'd', 'x'):
944 if ((pb->seekable & AVIO_SEEKABLE_NORMAL) && !(s->flags & AVFMT_FLAG_IGNIDX) &&
946 read_odml_index(s, 0) < 0 &&
947 (s->error_recognition & AV_EF_EXPLODE))
949 avio_seek(pb, pos + size, SEEK_SET);
951 case MKTAG('v', 'p', 'r', 'p'):
952 if (stream_index < (unsigned)s->nb_streams && size > 9 * 4) {
953 AVRational active, active_aspect;
955 st = s->streams[stream_index];
962 active_aspect.den = avio_rl16(pb);
963 active_aspect.num = avio_rl16(pb);
964 active.num = avio_rl32(pb);
965 active.den = avio_rl32(pb);
966 avio_rl32(pb); // nbFieldsPerFrame
968 if (active_aspect.num && active_aspect.den &&
969 active.num && active.den) {
970 st->sample_aspect_ratio = av_div_q(active_aspect, active);
971 av_log(s, AV_LOG_TRACE, "vprp %d/%d %d/%d\n",
972 active_aspect.num, active_aspect.den,
973 active.num, active.den);
979 case MKTAG('s', 't', 'r', 'n'):
981 ret = avi_read_tag(s, s->streams[s->nb_streams - 1], tag, size);
987 if (size > 1000000) {
988 av_log(s, AV_LOG_ERROR,
989 "Something went wrong during header parsing, "
990 "tag %s has size %u, "
991 "I will ignore it and try to continue anyway.\n",
992 av_fourcc2str(tag), size);
993 if (s->error_recognition & AV_EF_EXPLODE)
995 avi->movi_list = avio_tell(pb) - 4;
996 avi->movi_end = avi->fsize;
999 /* Do not fail for very large idx1 tags */
1000 case MKTAG('i', 'd', 'x', '1'):
1003 avio_skip(pb, size);
1009 /* check stream number */
1010 if (stream_index != s->nb_streams - 1) {
1013 return AVERROR_INVALIDDATA;
1016 if (!avi->index_loaded && (pb->seekable & AVIO_SEEKABLE_NORMAL))
1018 calculate_bitrate(s);
1019 avi->index_loaded |= 1;
1021 if ((ret = guess_ni_flag(s)) < 0)
1024 avi->non_interleaved |= ret | (s->flags & AVFMT_FLAG_SORT_DTS);
1026 dict_entry = av_dict_get(s->metadata, "ISFT", NULL, 0);
1027 if (dict_entry && !strcmp(dict_entry->value, "PotEncoder"))
1028 for (i = 0; i < s->nb_streams; i++) {
1029 AVStream *st = s->streams[i];
1030 if ( st->codecpar->codec_id == AV_CODEC_ID_MPEG1VIDEO
1031 || st->codecpar->codec_id == AV_CODEC_ID_MPEG2VIDEO)
1032 st->need_parsing = AVSTREAM_PARSE_FULL;
1035 for (i = 0; i < s->nb_streams; i++) {
1036 AVStream *st = s->streams[i];
1037 if (st->nb_index_entries)
1040 // DV-in-AVI cannot be non-interleaved, if set this must be
1043 avi->non_interleaved = 0;
1044 if (i == s->nb_streams && avi->non_interleaved) {
1045 av_log(s, AV_LOG_WARNING,
1046 "Non-interleaved AVI without index, switching to interleaved\n");
1047 avi->non_interleaved = 0;
1050 if (avi->non_interleaved) {
1051 av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
1055 ff_metadata_conv_ctx(s, NULL, avi_metadata_conv);
1056 ff_metadata_conv_ctx(s, NULL, ff_riff_info_conv);
1061 static int read_gab2_sub(AVFormatContext *s, AVStream *st, AVPacket *pkt)
1063 if (pkt->size >= 7 &&
1064 pkt->size < INT_MAX - AVPROBE_PADDING_SIZE &&
1065 !strcmp(pkt->data, "GAB2") && AV_RL16(pkt->data + 5) == 2) {
1067 int score = AVPROBE_SCORE_EXTENSION, ret;
1068 AVIStream *ast = st->priv_data;
1069 ff_const59 AVInputFormat *sub_demuxer;
1070 AVRational time_base;
1072 AVIOContext *pb = avio_alloc_context(pkt->data + 7,
1074 0, NULL, NULL, NULL, NULL);
1076 unsigned int desc_len = avio_rl32(pb);
1078 if (desc_len > pb->buf_end - pb->buf_ptr)
1081 ret = avio_get_str16le(pb, desc_len, desc, sizeof(desc));
1082 avio_skip(pb, desc_len - ret);
1084 av_dict_set(&st->metadata, "title", desc, 0);
1086 avio_rl16(pb); /* flags? */
1087 avio_rl32(pb); /* data size */
1089 size = pb->buf_end - pb->buf_ptr;
1090 pd = (AVProbeData) { .buf = av_mallocz(size + AVPROBE_PADDING_SIZE),
1094 memcpy(pd.buf, pb->buf_ptr, size);
1095 sub_demuxer = av_probe_input_format2(&pd, 1, &score);
1100 if (strcmp(sub_demuxer->name, "srt") && strcmp(sub_demuxer->name, "ass"))
1103 if (!(ast->sub_ctx = avformat_alloc_context()))
1106 ast->sub_ctx->pb = pb;
1108 if (ff_copy_whiteblacklists(ast->sub_ctx, s) < 0)
1111 if (!avformat_open_input(&ast->sub_ctx, "", sub_demuxer, NULL)) {
1112 if (ast->sub_ctx->nb_streams != 1)
1114 ff_read_packet(ast->sub_ctx, &ast->sub_pkt);
1115 avcodec_parameters_copy(st->codecpar, ast->sub_ctx->streams[0]->codecpar);
1116 time_base = ast->sub_ctx->streams[0]->time_base;
1117 avpriv_set_pts_info(st, 64, time_base.num, time_base.den);
1119 ast->sub_buffer = pkt->buf;
1121 av_packet_unref(pkt);
1125 av_freep(&ast->sub_ctx);
1126 avio_context_free(&pb);
1131 static AVStream *get_subtitle_pkt(AVFormatContext *s, AVStream *next_st,
1134 AVIStream *ast, *next_ast = next_st->priv_data;
1135 int64_t ts, next_ts, ts_min = INT64_MAX;
1136 AVStream *st, *sub_st = NULL;
1139 next_ts = av_rescale_q(next_ast->frame_offset, next_st->time_base,
1142 for (i = 0; i < s->nb_streams; i++) {
1144 ast = st->priv_data;
1145 if (st->discard < AVDISCARD_ALL && ast && ast->sub_pkt.data) {
1146 ts = av_rescale_q(ast->sub_pkt.dts, st->time_base, AV_TIME_BASE_Q);
1147 if (ts <= next_ts && ts < ts_min) {
1155 ast = sub_st->priv_data;
1156 *pkt = ast->sub_pkt;
1157 pkt->stream_index = sub_st->index;
1159 if (ff_read_packet(ast->sub_ctx, &ast->sub_pkt) < 0)
1160 ast->sub_pkt.data = NULL;
1165 static int get_stream_idx(const unsigned *d)
1167 if (d[0] >= '0' && d[0] <= '9' &&
1168 d[1] >= '0' && d[1] <= '9') {
1169 return (d[0] - '0') * 10 + (d[1] - '0');
1171 return 100; // invalid stream ID
1177 * @param exit_early set to 1 to just gather packet position without making the changes needed to actually read & return the packet
1179 static int avi_sync(AVFormatContext *s, int exit_early)
1181 AVIContext *avi = s->priv_data;
1182 AVIOContext *pb = s->pb;
1189 memset(d, -1, sizeof(d));
1190 for (i = sync = avio_tell(pb); !avio_feof(pb); i++) {
1193 for (j = 0; j < 7; j++)
1197 size = d[4] + (d[5] << 8) + (d[6] << 16) + (d[7] << 24);
1199 n = get_stream_idx(d + 2);
1200 ff_tlog(s, "%X %X %X %X %X %X %X %X %"PRId64" %u %d\n",
1201 d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], i, size, n);
1202 if (i*(avi->io_fsize>0) + (uint64_t)size > avi->fsize || d[0] > 127)
1206 if ((d[0] == 'i' && d[1] == 'x' && n < s->nb_streams) ||
1208 (d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K') ||
1209 (d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1') ||
1210 (d[0] == 'i' && d[1] == 'n' && d[2] == 'd' && d[3] == 'x')) {
1211 avio_skip(pb, size);
1216 if (d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T') {
1221 n = get_stream_idx(d);
1223 if (!((i - avi->last_pkt_pos) & 1) &&
1224 get_stream_idx(d + 1) < s->nb_streams)
1227 // detect ##ix chunk and skip
1228 if (d[2] == 'i' && d[3] == 'x' && n < s->nb_streams) {
1229 avio_skip(pb, size);
1233 if (d[2] == 'w' && d[3] == 'c' && n < s->nb_streams) {
1234 avio_skip(pb, 16 * 3 + 8);
1238 if (avi->dv_demux && n != 0)
1242 if (n < s->nb_streams) {
1246 ast = st->priv_data;
1249 av_log(s, AV_LOG_WARNING, "Skipping foreign stream %d packet\n", n);
1253 if (s->nb_streams >= 2) {
1254 AVStream *st1 = s->streams[1];
1255 AVIStream *ast1 = st1->priv_data;
1256 // workaround for broken small-file-bug402.avi
1257 if ( d[2] == 'w' && d[3] == 'b'
1259 && st ->codecpar->codec_type == AVMEDIA_TYPE_VIDEO
1260 && st1->codecpar->codec_type == AVMEDIA_TYPE_AUDIO
1261 && ast->prefix == 'd'*256+'c'
1262 && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
1267 av_log(s, AV_LOG_WARNING,
1268 "Invalid stream + prefix combination, assuming audio.\n");
1272 if (d[2] == 'p' && d[3] == 'c' && size <= 4 * 256 + 4) {
1273 int k = avio_r8(pb);
1274 int last = (k + avio_r8(pb) - 1) & 0xFF;
1276 avio_rl16(pb); // flags
1278 // b + (g << 8) + (r << 16);
1279 for (; k <= last; k++)
1280 ast->pal[k] = 0xFFU<<24 | avio_rb32(pb)>>8;
1284 } else if (((ast->prefix_count < 5 || sync + 9 > i) &&
1285 d[2] < 128 && d[3] < 128) ||
1286 d[2] * 256 + d[3] == ast->prefix /* ||
1287 (d[2] == 'd' && d[3] == 'c') ||
1288 (d[2] == 'w' && d[3] == 'b') */) {
1291 if (d[2] * 256 + d[3] == ast->prefix)
1292 ast->prefix_count++;
1294 ast->prefix = d[2] * 256 + d[3];
1295 ast->prefix_count = 0;
1298 if (!avi->dv_demux &&
1299 ((st->discard >= AVDISCARD_DEFAULT && size == 0) /* ||
1300 // FIXME: needs a little reordering
1301 (st->discard >= AVDISCARD_NONKEY &&
1302 !(pkt->flags & AV_PKT_FLAG_KEY)) */
1303 || st->discard >= AVDISCARD_ALL)) {
1305 ast->frame_offset += get_duration(ast, size);
1306 avio_skip(pb, size);
1310 avi->stream_index = n;
1311 ast->packet_size = size + 8;
1312 ast->remaining = size;
1315 uint64_t pos = avio_tell(pb) - 8;
1316 if (!st->index_entries || !st->nb_index_entries ||
1317 st->index_entries[st->nb_index_entries - 1].pos < pos) {
1318 av_add_index_entry(st, pos, ast->frame_offset, size,
1319 0, AVINDEX_KEYFRAME);
1332 static int ni_prepare_read(AVFormatContext *s)
1334 AVIContext *avi = s->priv_data;
1335 int best_stream_index = 0;
1336 AVStream *best_st = NULL;
1337 AVIStream *best_ast;
1338 int64_t best_ts = INT64_MAX;
1341 for (i = 0; i < s->nb_streams; i++) {
1342 AVStream *st = s->streams[i];
1343 AVIStream *ast = st->priv_data;
1344 int64_t ts = ast->frame_offset;
1347 if (!st->nb_index_entries)
1350 last_ts = st->index_entries[st->nb_index_entries - 1].timestamp;
1351 if (!ast->remaining && ts > last_ts)
1354 ts = av_rescale_q(ts, st->time_base,
1355 (AVRational) { FFMAX(1, ast->sample_size),
1358 av_log(s, AV_LOG_TRACE, "%"PRId64" %d/%d %"PRId64"\n", ts,
1359 st->time_base.num, st->time_base.den, ast->frame_offset);
1363 best_stream_index = i;
1369 best_ast = best_st->priv_data;
1370 best_ts = best_ast->frame_offset;
1371 if (best_ast->remaining) {
1372 i = av_index_search_timestamp(best_st,
1375 AVSEEK_FLAG_BACKWARD);
1377 i = av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
1379 best_ast->frame_offset = best_st->index_entries[i].timestamp;
1383 int64_t pos = best_st->index_entries[i].pos;
1384 pos += best_ast->packet_size - best_ast->remaining;
1385 if (avio_seek(s->pb, pos + 8, SEEK_SET) < 0)
1388 av_assert0(best_ast->remaining <= best_ast->packet_size);
1390 avi->stream_index = best_stream_index;
1391 if (!best_ast->remaining)
1392 best_ast->packet_size =
1393 best_ast->remaining = best_st->index_entries[i].size;
1401 static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
1403 AVIContext *avi = s->priv_data;
1404 AVIOContext *pb = s->pb;
1407 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1408 int size = avpriv_dv_get_packet(avi->dv_demux, pkt);
1415 if (avi->non_interleaved) {
1416 err = ni_prepare_read(s);
1422 if (avi->stream_index >= 0) {
1423 AVStream *st = s->streams[avi->stream_index];
1424 AVIStream *ast = st->priv_data;
1427 if (get_subtitle_pkt(s, st, pkt))
1430 // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
1431 if (ast->sample_size <= 1)
1433 else if (ast->sample_size < 32)
1434 // arbitrary multiplier to avoid tiny packets for raw PCM data
1435 size = 1024 * ast->sample_size;
1437 size = ast->sample_size;
1439 if (size > ast->remaining)
1440 size = ast->remaining;
1441 avi->last_pkt_pos = avio_tell(pb);
1442 err = av_get_packet(pb, pkt, size);
1447 if (ast->has_pal && pkt->size < (unsigned)INT_MAX / 2) {
1449 pal = av_packet_new_side_data(pkt,
1450 AV_PKT_DATA_PALETTE,
1453 av_log(s, AV_LOG_ERROR,
1454 "Failed to allocate data for palette\n");
1456 memcpy(pal, ast->pal, AVPALETTE_SIZE);
1461 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1462 AVBufferRef *avbuf = pkt->buf;
1463 size = avpriv_dv_produce_packet(avi->dv_demux, pkt,
1464 pkt->data, pkt->size, pkt->pos);
1466 pkt->flags |= AV_PKT_FLAG_KEY;
1468 av_packet_unref(pkt);
1469 } else if (st->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE &&
1470 !st->codecpar->codec_tag && read_gab2_sub(s, st, pkt)) {
1471 ast->frame_offset++;
1472 avi->stream_index = -1;
1476 /* XXX: How to handle B-frames in AVI? */
1477 pkt->dts = ast->frame_offset;
1478 // pkt->dts += ast->start;
1479 if (ast->sample_size)
1480 pkt->dts /= ast->sample_size;
1481 pkt->stream_index = avi->stream_index;
1483 if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && st->index_entries) {
1487 index = av_index_search_timestamp(st, ast->frame_offset, AVSEEK_FLAG_ANY);
1488 e = &st->index_entries[index];
1490 if (index >= 0 && e->timestamp == ast->frame_offset) {
1491 if (index == st->nb_index_entries-1) {
1494 if (st->codecpar->codec_id == AV_CODEC_ID_MPEG4) {
1495 const uint8_t *ptr = pkt->data, *end = ptr + FFMIN(size, 256);
1497 ptr = avpriv_find_start_code(ptr, end, &state);
1498 if (state == 0x1B6 && ptr < end) {
1499 key = !(*ptr & 0xC0);
1505 e->flags &= ~AVINDEX_KEYFRAME;
1507 if (e->flags & AVINDEX_KEYFRAME)
1508 pkt->flags |= AV_PKT_FLAG_KEY;
1511 pkt->flags |= AV_PKT_FLAG_KEY;
1513 ast->frame_offset += get_duration(ast, pkt->size);
1515 ast->remaining -= err;
1516 if (!ast->remaining) {
1517 avi->stream_index = -1;
1518 ast->packet_size = 0;
1521 if (!avi->non_interleaved && pkt->pos >= 0 && ast->seek_pos > pkt->pos) {
1522 av_packet_unref(pkt);
1527 if (!avi->non_interleaved && st->nb_index_entries>1 && avi->index_loaded>1) {
1528 int64_t dts= av_rescale_q(pkt->dts, st->time_base, AV_TIME_BASE_Q);
1530 if (avi->dts_max < dts) {
1532 } else if (avi->dts_max - (uint64_t)dts > 2*AV_TIME_BASE) {
1533 avi->non_interleaved= 1;
1534 av_log(s, AV_LOG_INFO, "Switching to NI mode, due to poor interleaving\n");
1541 if ((err = avi_sync(s, 0)) < 0)
1546 /* XXX: We make the implicit supposition that the positions are sorted
1547 * for each stream. */
1548 static int avi_read_idx1(AVFormatContext *s, int size)
1550 AVIContext *avi = s->priv_data;
1551 AVIOContext *pb = s->pb;
1552 int nb_index_entries, i;
1556 unsigned int index, tag, flags, len, first_packet = 1;
1557 int64_t last_pos = -1;
1558 unsigned last_idx = -1;
1559 int64_t idx1_pos, first_packet_pos = 0, data_offset = 0;
1562 nb_index_entries = size / 16;
1563 if (nb_index_entries <= 0)
1564 return AVERROR_INVALIDDATA;
1566 idx1_pos = avio_tell(pb);
1567 avio_seek(pb, avi->movi_list + 4, SEEK_SET);
1568 if (avi_sync(s, 1) == 0)
1569 first_packet_pos = avio_tell(pb) - 8;
1570 avi->stream_index = -1;
1571 avio_seek(pb, idx1_pos, SEEK_SET);
1573 if (s->nb_streams == 1 && s->streams[0]->codecpar->codec_tag == AV_RL32("MMES")) {
1574 first_packet_pos = 0;
1575 data_offset = avi->movi_list;
1578 /* Read the entries and sort them in each stream component. */
1579 for (i = 0; i < nb_index_entries; i++) {
1583 tag = avio_rl32(pb);
1584 flags = avio_rl32(pb);
1585 pos = avio_rl32(pb);
1586 len = avio_rl32(pb);
1587 av_log(s, AV_LOG_TRACE, "%d: tag=0x%x flags=0x%x pos=0x%"PRIx64" len=%d/",
1588 i, tag, flags, pos, len);
1590 index = ((tag & 0xff) - '0') * 10;
1591 index += (tag >> 8 & 0xff) - '0';
1592 if (index >= s->nb_streams)
1594 st = s->streams[index];
1595 ast = st->priv_data;
1597 /* Skip 'xxpc' palette change entries in the index until a logic
1598 * to process these is properly implemented. */
1599 if ((tag >> 16 & 0xff) == 'p' && (tag >> 24 & 0xff) == 'c')
1602 if (first_packet && first_packet_pos) {
1603 if (avi->movi_list + 4 != pos || pos + 500 > first_packet_pos)
1604 data_offset = first_packet_pos - pos;
1609 av_log(s, AV_LOG_TRACE, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
1611 // even if we have only a single stream, we should
1612 // switch to non-interleaved to get correct timestamps
1613 if (last_pos == pos)
1614 avi->non_interleaved = 1;
1615 if (last_idx != pos && len) {
1616 av_add_index_entry(st, pos, ast->cum_len, len, 0,
1617 (flags & AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
1620 ast->cum_len += get_duration(ast, len);
1622 anykey |= flags&AVIIF_INDEX;
1625 for (index = 0; index < s->nb_streams; index++) {
1626 st = s->streams[index];
1627 if (st->nb_index_entries)
1628 st->index_entries[0].flags |= AVINDEX_KEYFRAME;
1634 /* Scan the index and consider any file with streams more than
1635 * 2 seconds or 64MB apart non-interleaved. */
1636 static int check_stream_max_drift(AVFormatContext *s)
1638 int64_t min_pos, pos;
1640 int *idx = av_mallocz_array(s->nb_streams, sizeof(*idx));
1642 return AVERROR(ENOMEM);
1643 for (min_pos = pos = 0; min_pos != INT64_MAX; pos = min_pos + 1LU) {
1644 int64_t max_dts = INT64_MIN / 2;
1645 int64_t min_dts = INT64_MAX / 2;
1646 int64_t max_buffer = 0;
1648 min_pos = INT64_MAX;
1650 for (i = 0; i < s->nb_streams; i++) {
1651 AVStream *st = s->streams[i];
1652 AVIStream *ast = st->priv_data;
1653 int n = st->nb_index_entries;
1654 while (idx[i] < n && st->index_entries[idx[i]].pos < pos)
1658 dts = av_rescale_q(st->index_entries[idx[i]].timestamp /
1659 FFMAX(ast->sample_size, 1),
1660 st->time_base, AV_TIME_BASE_Q);
1661 min_dts = FFMIN(min_dts, dts);
1662 min_pos = FFMIN(min_pos, st->index_entries[idx[i]].pos);
1665 for (i = 0; i < s->nb_streams; i++) {
1666 AVStream *st = s->streams[i];
1667 AVIStream *ast = st->priv_data;
1669 if (idx[i] && min_dts != INT64_MAX / 2) {
1671 dts = av_rescale_q(st->index_entries[idx[i] - 1].timestamp /
1672 FFMAX(ast->sample_size, 1),
1673 st->time_base, AV_TIME_BASE_Q);
1674 max_dts = FFMAX(max_dts, dts);
1675 max_buffer = FFMAX(max_buffer,
1676 av_rescale(dts - min_dts,
1677 st->codecpar->bit_rate,
1681 if (max_dts - min_dts > 2 * AV_TIME_BASE ||
1682 max_buffer > 1024 * 1024 * 8 * 8) {
1691 static int guess_ni_flag(AVFormatContext *s)
1694 int64_t last_start = 0;
1695 int64_t first_end = INT64_MAX;
1696 int64_t oldpos = avio_tell(s->pb);
1698 for (i = 0; i < s->nb_streams; i++) {
1699 AVStream *st = s->streams[i];
1700 int n = st->nb_index_entries;
1707 int64_t pos = st->index_entries[0].pos;
1709 avio_seek(s->pb, pos, SEEK_SET);
1710 tag[0] = avio_r8(s->pb);
1711 tag[1] = avio_r8(s->pb);
1713 size = avio_rl32(s->pb);
1714 if (get_stream_idx(tag) == i && pos + size > st->index_entries[1].pos)
1715 last_start = INT64_MAX;
1716 if (get_stream_idx(tag) == i && size == st->index_entries[0].size + 8)
1717 last_start = INT64_MAX;
1720 if (st->index_entries[0].pos > last_start)
1721 last_start = st->index_entries[0].pos;
1722 if (st->index_entries[n - 1].pos < first_end)
1723 first_end = st->index_entries[n - 1].pos;
1725 avio_seek(s->pb, oldpos, SEEK_SET);
1727 if (last_start > first_end)
1730 return check_stream_max_drift(s);
1733 static int avi_load_index(AVFormatContext *s)
1735 AVIContext *avi = s->priv_data;
1736 AVIOContext *pb = s->pb;
1738 int64_t pos = avio_tell(pb);
1742 if (avio_seek(pb, avi->movi_end, SEEK_SET) < 0)
1743 goto the_end; // maybe truncated file
1744 av_log(s, AV_LOG_TRACE, "movi_end=0x%"PRIx64"\n", avi->movi_end);
1746 tag = avio_rl32(pb);
1747 size = avio_rl32(pb);
1750 next = avio_tell(pb) + size + (size & 1);
1752 if (tag == MKTAG('i', 'd', 'x', '1') &&
1753 avi_read_idx1(s, size) >= 0) {
1754 avi->index_loaded=2;
1756 }else if (tag == MKTAG('L', 'I', 'S', 'T')) {
1757 uint32_t tag1 = avio_rl32(pb);
1759 if (tag1 == MKTAG('I', 'N', 'F', 'O'))
1760 ff_read_riff_info(s, size - 4);
1764 if (avio_seek(pb, next, SEEK_SET) < 0)
1765 break; // something is wrong here
1769 avio_seek(pb, pos, SEEK_SET);
1773 static void seek_subtitle(AVStream *st, AVStream *st2, int64_t timestamp)
1775 AVIStream *ast2 = st2->priv_data;
1776 int64_t ts2 = av_rescale_q(timestamp, st->time_base, st2->time_base);
1777 av_packet_unref(&ast2->sub_pkt);
1778 if (avformat_seek_file(ast2->sub_ctx, 0, INT64_MIN, ts2, ts2, 0) >= 0 ||
1779 avformat_seek_file(ast2->sub_ctx, 0, ts2, ts2, INT64_MAX, 0) >= 0)
1780 ff_read_packet(ast2->sub_ctx, &ast2->sub_pkt);
1783 static int avi_read_seek(AVFormatContext *s, int stream_index,
1784 int64_t timestamp, int flags)
1786 AVIContext *avi = s->priv_data;
1789 int64_t pos, pos_min;
1792 /* Does not matter which stream is requested dv in avi has the
1793 * stream information in the first video stream.
1798 if (!avi->index_loaded) {
1799 /* we only load the index on demand */
1801 avi->index_loaded |= 1;
1803 av_assert0(stream_index >= 0);
1805 st = s->streams[stream_index];
1806 ast = st->priv_data;
1807 index = av_index_search_timestamp(st,
1808 timestamp * FFMAX(ast->sample_size, 1),
1811 if (st->nb_index_entries > 0)
1812 av_log(s, AV_LOG_DEBUG, "Failed to find timestamp %"PRId64 " in index %"PRId64 " .. %"PRId64 "\n",
1813 timestamp * FFMAX(ast->sample_size, 1),
1814 st->index_entries[0].timestamp,
1815 st->index_entries[st->nb_index_entries - 1].timestamp);
1816 return AVERROR_INVALIDDATA;
1819 /* find the position */
1820 pos = st->index_entries[index].pos;
1821 timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1);
1823 av_log(s, AV_LOG_TRACE, "XX %"PRId64" %d %"PRId64"\n",
1824 timestamp, index, st->index_entries[index].timestamp);
1826 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1827 /* One and only one real stream for DV in AVI, and it has video */
1828 /* offsets. Calling with other stream indexes should have failed */
1829 /* the av_index_search_timestamp call above. */
1831 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
1834 /* Feed the DV video stream version of the timestamp to the */
1835 /* DV demux so it can synthesize correct timestamps. */
1836 ff_dv_offset_reset(avi->dv_demux, timestamp);
1838 avi->stream_index = -1;
1843 for (i = 0; i < s->nb_streams; i++) {
1844 AVStream *st2 = s->streams[i];
1845 AVIStream *ast2 = st2->priv_data;
1848 ast2->remaining = 0;
1850 if (ast2->sub_ctx) {
1851 seek_subtitle(st, st2, timestamp);
1855 if (st2->nb_index_entries <= 0)
1858 // av_assert1(st2->codecpar->block_align);
1859 index = av_index_search_timestamp(st2,
1860 av_rescale_q(timestamp,
1863 FFMAX(ast2->sample_size, 1),
1865 AVSEEK_FLAG_BACKWARD |
1866 (st2->codecpar->codec_type != AVMEDIA_TYPE_VIDEO ? AVSEEK_FLAG_ANY : 0));
1869 ast2->seek_pos = st2->index_entries[index].pos;
1870 pos_min = FFMIN(pos_min,ast2->seek_pos);
1872 for (i = 0; i < s->nb_streams; i++) {
1873 AVStream *st2 = s->streams[i];
1874 AVIStream *ast2 = st2->priv_data;
1876 if (ast2->sub_ctx || st2->nb_index_entries <= 0)
1879 index = av_index_search_timestamp(
1881 av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
1882 flags | AVSEEK_FLAG_BACKWARD | (st2->codecpar->codec_type != AVMEDIA_TYPE_VIDEO ? AVSEEK_FLAG_ANY : 0));
1885 while (!avi->non_interleaved && index>0 && st2->index_entries[index-1].pos >= pos_min)
1887 ast2->frame_offset = st2->index_entries[index].timestamp;
1891 if (avio_seek(s->pb, pos_min, SEEK_SET) < 0) {
1892 av_log(s, AV_LOG_ERROR, "Seek failed\n");
1895 avi->stream_index = -1;
1896 avi->dts_max = INT_MIN;
1900 static int avi_read_close(AVFormatContext *s)
1903 AVIContext *avi = s->priv_data;
1905 for (i = 0; i < s->nb_streams; i++) {
1906 AVStream *st = s->streams[i];
1907 AVIStream *ast = st->priv_data;
1910 av_freep(&ast->sub_ctx->pb);
1911 avformat_close_input(&ast->sub_ctx);
1913 av_buffer_unref(&ast->sub_buffer);
1914 av_packet_unref(&ast->sub_pkt);
1918 av_freep(&avi->dv_demux);
1923 static int avi_probe(const AVProbeData *p)
1927 /* check file header */
1928 for (i = 0; avi_headers[i][0]; i++)
1929 if (AV_RL32(p->buf ) == AV_RL32(avi_headers[i] ) &&
1930 AV_RL32(p->buf + 8) == AV_RL32(avi_headers[i] + 4))
1931 return AVPROBE_SCORE_MAX;
1936 AVInputFormat ff_avi_demuxer = {
1938 .long_name = NULL_IF_CONFIG_SMALL("AVI (Audio Video Interleaved)"),
1939 .priv_data_size = sizeof(AVIContext),
1940 .extensions = "avi",
1941 .read_probe = avi_probe,
1942 .read_header = avi_read_header,
1943 .read_packet = avi_read_packet,
1944 .read_close = avi_read_close,
1945 .read_seek = avi_read_seek,
1946 .priv_class = &demuxer_class,