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_INT, {.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_dlog(NULL, "pos:%"PRIX64" %s: tag=%c%c%c%c size=0x%x\n", \
122 avio_tell(pb), str, tag & 0xff, \
124 (tag >> 16) & 0xff, \
125 (tag >> 24) & 0xff, \
128 static inline int get_duration(AVIStream *ast, int len)
130 if (ast->sample_size)
132 else if (ast->dshow_block_align > 1)
133 return (len + ast->dshow_block_align - 1) / ast->dshow_block_align;
138 static int get_riff(AVFormatContext *s, AVIOContext *pb)
140 AVIContext *avi = s->priv_data;
141 char header[8] = {0};
144 /* check RIFF header */
145 avio_read(pb, header, 4);
146 avi->riff_end = avio_rl32(pb); /* RIFF chunk size */
147 avi->riff_end += avio_tell(pb); /* RIFF chunk end */
148 avio_read(pb, header + 4, 4);
150 for (i = 0; avi_headers[i][0]; i++)
151 if (!memcmp(header, avi_headers[i], 8))
153 if (!avi_headers[i][0])
154 return AVERROR_INVALIDDATA;
156 if (header[7] == 0x19)
157 av_log(s, AV_LOG_INFO,
158 "This file has been generated by a totally broken muxer.\n");
163 static int read_braindead_odml_indx(AVFormatContext *s, int frame_num)
165 AVIContext *avi = s->priv_data;
166 AVIOContext *pb = s->pb;
167 int longs_pre_entry = avio_rl16(pb);
168 int index_sub_type = avio_r8(pb);
169 int index_type = avio_r8(pb);
170 int entries_in_use = avio_rl32(pb);
171 int chunk_id = avio_rl32(pb);
172 int64_t base = avio_rl64(pb);
173 int stream_id = ((chunk_id & 0xFF) - '0') * 10 +
174 ((chunk_id >> 8 & 0xFF) - '0');
178 int64_t last_pos = -1;
179 int64_t filesize = avi->fsize;
182 "longs_pre_entry:%d index_type:%d entries_in_use:%d "
183 "chunk_id:%X base:%16"PRIX64"\n",
190 if (stream_id >= s->nb_streams || stream_id < 0)
191 return AVERROR_INVALIDDATA;
192 st = s->streams[stream_id];
196 return AVERROR_INVALIDDATA;
200 if (index_type && longs_pre_entry != 2)
201 return AVERROR_INVALIDDATA;
203 return AVERROR_INVALIDDATA;
205 if (filesize > 0 && base >= filesize) {
206 av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
207 if (base >> 32 == (base & 0xFFFFFFFF) &&
208 (base & 0xFFFFFFFF) < filesize &&
209 filesize <= 0xFFFFFFFF)
212 return AVERROR_INVALIDDATA;
215 for (i = 0; i < entries_in_use; i++) {
217 int64_t pos = avio_rl32(pb) + base - 8;
218 int len = avio_rl32(pb);
223 av_log(s, AV_LOG_ERROR, "pos:%"PRId64", len:%X\n", pos, len);
226 return AVERROR_INVALIDDATA;
228 if (last_pos == pos || pos == base - 8)
229 avi->non_interleaved = 1;
230 if (last_pos != pos && len)
231 av_add_index_entry(st, pos, ast->cum_len, len, 0,
232 key ? AVINDEX_KEYFRAME : 0);
234 ast->cum_len += get_duration(ast, len);
239 offset = avio_rl64(pb);
240 avio_rl32(pb); /* size */
241 duration = avio_rl32(pb);
244 return AVERROR_INVALIDDATA;
248 if (avi->odml_depth > MAX_ODML_DEPTH) {
249 av_log(s, AV_LOG_ERROR, "Too deeply nested ODML indexes\n");
250 return AVERROR_INVALIDDATA;
253 if (avio_seek(pb, offset + 8, SEEK_SET) < 0)
256 read_braindead_odml_indx(s, frame_num);
258 frame_num += duration;
260 if (avio_seek(pb, pos, SEEK_SET) < 0) {
261 av_log(s, AV_LOG_ERROR, "Failed to restore position after reading index\n");
267 avi->index_loaded = 2;
271 static void clean_index(AVFormatContext *s)
276 for (i = 0; i < s->nb_streams; i++) {
277 AVStream *st = s->streams[i];
278 AVIStream *ast = st->priv_data;
279 int n = st->nb_index_entries;
280 int max = ast->sample_size;
281 int64_t pos, size, ts;
283 if (n != 1 || ast->sample_size == 0)
289 pos = st->index_entries[0].pos;
290 size = st->index_entries[0].size;
291 ts = st->index_entries[0].timestamp;
293 for (j = 0; j < size; j += max)
294 av_add_index_entry(st, pos + j, ts + j, FFMIN(max, size - j), 0,
299 static int avi_read_tag(AVFormatContext *s, AVStream *st, uint32_t tag,
302 AVIOContext *pb = s->pb;
308 if (size == UINT_MAX)
309 return AVERROR(EINVAL);
310 value = av_malloc(size + 1);
312 return AVERROR(ENOMEM);
313 if (avio_read(pb, value, size) != size)
314 return AVERROR_INVALIDDATA;
319 return av_dict_set(st ? &st->metadata : &s->metadata, key, value,
320 AV_DICT_DONT_STRDUP_VAL);
323 static const char months[12][4] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
324 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
326 static void avi_metadata_creation_time(AVDictionary **metadata, char *date)
328 char month[4], time[9], buffer[64];
330 /* parse standard AVI date format (ie. "Mon Mar 10 15:04:43 2003") */
331 if (sscanf(date, "%*3s%*[ ]%3s%*[ ]%2d%*[ ]%8s%*[ ]%4d",
332 month, &day, time, &year) == 4) {
333 for (i = 0; i < 12; i++)
334 if (!av_strcasecmp(month, months[i])) {
335 snprintf(buffer, sizeof(buffer), "%.4d-%.2d-%.2d %s",
336 year, i + 1, day, time);
337 av_dict_set(metadata, "creation_time", buffer, 0);
339 } else if (date[4] == '/' && date[7] == '/') {
340 date[4] = date[7] = '-';
341 av_dict_set(metadata, "creation_time", date, 0);
345 static void avi_read_nikon(AVFormatContext *s, uint64_t end)
347 while (avio_tell(s->pb) < end) {
348 uint32_t tag = avio_rl32(s->pb);
349 uint32_t size = avio_rl32(s->pb);
351 case MKTAG('n', 'c', 't', 'g'): /* Nikon Tags */
353 uint64_t tag_end = avio_tell(s->pb) + size;
354 while (avio_tell(s->pb) < tag_end) {
355 uint16_t tag = avio_rl16(s->pb);
356 uint16_t size = avio_rl16(s->pb);
357 const char *name = NULL;
358 char buffer[64] = { 0 };
359 size = FFMIN(size, tag_end - avio_tell(s->pb));
360 size -= avio_read(s->pb, buffer,
361 FFMIN(size, sizeof(buffer) - 1));
370 name = "creation_time";
371 if (buffer[4] == ':' && buffer[7] == ':')
372 buffer[4] = buffer[7] = '-';
376 av_dict_set(&s->metadata, name, buffer, 0);
377 avio_skip(s->pb, size);
382 avio_skip(s->pb, size);
388 static int avi_extract_stream_metadata(AVStream *st)
391 uint8_t *data = st->codec->extradata;
392 int data_size = st->codec->extradata_size;
395 if (!data || data_size < 8) {
396 return AVERROR_INVALIDDATA;
399 bytestream2_init(&gb, data, data_size);
401 tag = bytestream2_get_le32(&gb);
404 case MKTAG('A', 'V', 'I', 'F'):
405 // skip 4 byte padding
406 bytestream2_skip(&gb, 4);
407 offset = bytestream2_tell(&gb);
408 bytestream2_init(&gb, data + offset, data_size - offset);
410 // decode EXIF tags from IFD, AVI is always little-endian
411 return avpriv_exif_decode_ifd(st->codec, &gb, 1, 0, &st->metadata);
413 case MKTAG('C', 'A', 'S', 'I'):
414 avpriv_request_sample(st->codec, "RIFF stream data tag type CASI (%u)", tag);
416 case MKTAG('Z', 'o', 'r', 'a'):
417 avpriv_request_sample(st->codec, "RIFF stream data tag type Zora (%u)", tag);
426 static int calculate_bitrate(AVFormatContext *s)
428 AVIContext *avi = s->priv_data;
433 for (i = 0; i<s->nb_streams; i++) {
435 AVStream *st = s->streams[i];
437 if (!st->nb_index_entries)
440 for (j = 0; j < st->nb_index_entries; j++)
441 len += st->index_entries[j].size;
442 maxpos = FFMAX(maxpos, st->index_entries[j-1].pos);
445 if (maxpos < avi->io_fsize*9/10) // index does not cover the whole file
447 if (lensum*9/10 > maxpos || lensum < maxpos*9/10) // frame sum and filesize mismatch
450 for (i = 0; i<s->nb_streams; i++) {
452 AVStream *st = s->streams[i];
455 for (j = 0; j < st->nb_index_entries; j++)
456 len += st->index_entries[j].size;
458 if (st->nb_index_entries < 2 || st->codec->bit_rate > 0)
460 duration = st->index_entries[j-1].timestamp - st->index_entries[0].timestamp;
461 st->codec->bit_rate = av_rescale(8*len, st->time_base.den, duration * st->time_base.num);
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;
480 AVDictionaryEntry *dict_entry;
482 avi->stream_index = -1;
484 ret = get_riff(s, pb);
488 av_log(avi, AV_LOG_DEBUG, "use odml:%d\n", avi->use_odml);
490 avi->io_fsize = avi->fsize = avio_size(pb);
491 if (avi->fsize <= 0 || avi->fsize < avi->riff_end)
492 avi->fsize = avi->riff_end == 8 ? INT64_MAX : avi->riff_end;
502 size = avio_rl32(pb);
504 print_tag("tag", tag, size);
507 case MKTAG('L', 'I', 'S', 'T'):
508 list_end = avio_tell(pb) + size;
509 /* Ignored, except at start of video packets. */
510 tag1 = avio_rl32(pb);
512 print_tag("list", tag1, 0);
514 if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
515 avi->movi_list = avio_tell(pb) - 4;
517 avi->movi_end = avi->movi_list + size + (size & 1);
519 avi->movi_end = avi->fsize;
520 av_dlog(NULL, "movi end=%"PRIx64"\n", avi->movi_end);
522 } else if (tag1 == MKTAG('I', 'N', 'F', 'O'))
523 ff_read_riff_info(s, size - 4);
524 else if (tag1 == MKTAG('n', 'c', 'd', 't'))
525 avi_read_nikon(s, list_end);
528 case MKTAG('I', 'D', 'I', 'T'):
530 unsigned char date[64] = { 0 };
532 size -= avio_read(pb, date, FFMIN(size, sizeof(date) - 1));
534 avi_metadata_creation_time(&s->metadata, date);
537 case MKTAG('d', 'm', 'l', 'h'):
539 avio_skip(pb, size + (size & 1));
541 case MKTAG('a', 'm', 'v', 'h'):
543 case MKTAG('a', 'v', 'i', 'h'):
545 /* using frame_period is bad idea */
546 frame_period = avio_rl32(pb);
547 avio_rl32(pb); /* max. bytes per second */
549 avi->non_interleaved |= avio_rl32(pb) & AVIF_MUSTUSEINDEX;
551 avio_skip(pb, 2 * 4);
554 avih_width = avio_rl32(pb);
555 avih_height = avio_rl32(pb);
557 avio_skip(pb, size - 10 * 4);
559 case MKTAG('s', 't', 'r', 'h'):
562 tag1 = avio_rl32(pb);
563 handler = avio_rl32(pb); /* codec tag */
565 if (tag1 == MKTAG('p', 'a', 'd', 's')) {
566 avio_skip(pb, size - 8);
570 st = avformat_new_stream(s, NULL);
574 st->id = stream_index;
575 ast = av_mallocz(sizeof(AVIStream));
581 tag1 = stream_index ? MKTAG('a', 'u', 'd', 's')
582 : MKTAG('v', 'i', 'd', 's');
584 print_tag("strh", tag1, -1);
586 if (tag1 == MKTAG('i', 'a', 'v', 's') ||
587 tag1 == MKTAG('i', 'v', 'a', 's')) {
590 /* After some consideration -- I don't think we
591 * have to support anything but DV in type1 AVIs. */
592 if (s->nb_streams != 1)
595 if (handler != MKTAG('d', 'v', 's', 'd') &&
596 handler != MKTAG('d', 'v', 'h', 'd') &&
597 handler != MKTAG('d', 'v', 's', 'l'))
600 ast = s->streams[0]->priv_data;
601 av_freep(&s->streams[0]->codec->extradata);
602 av_freep(&s->streams[0]->codec);
603 if (s->streams[0]->info)
604 av_freep(&s->streams[0]->info->duration_error);
605 av_freep(&s->streams[0]->info);
606 av_freep(&s->streams[0]);
608 if (CONFIG_DV_DEMUXER) {
609 avi->dv_demux = avpriv_dv_init_demux(s);
614 s->streams[0]->priv_data = ast;
615 avio_skip(pb, 3 * 4);
616 ast->scale = avio_rl32(pb);
617 ast->rate = avio_rl32(pb);
618 avio_skip(pb, 4); /* start time */
620 dv_dur = avio_rl32(pb);
621 if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
622 dv_dur *= AV_TIME_BASE;
623 s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
625 /* else, leave duration alone; timing estimation in utils.c
626 * will make a guess based on bitrate. */
628 stream_index = s->nb_streams - 1;
629 avio_skip(pb, size - 9 * 4);
633 av_assert0(stream_index < s->nb_streams);
634 ast->handler = handler;
636 avio_rl32(pb); /* flags */
637 avio_rl16(pb); /* priority */
638 avio_rl16(pb); /* language */
639 avio_rl32(pb); /* initial frame */
640 ast->scale = avio_rl32(pb);
641 ast->rate = avio_rl32(pb);
642 if (!(ast->scale && ast->rate)) {
643 av_log(s, AV_LOG_WARNING,
644 "scale/rate is %"PRIu32"/%"PRIu32" which is invalid. "
645 "(This file has been generated by broken software.)\n",
650 ast->scale = frame_period;
656 avpriv_set_pts_info(st, 64, ast->scale, ast->rate);
658 ast->cum_len = avio_rl32(pb); /* start */
659 st->nb_frames = avio_rl32(pb);
662 avio_rl32(pb); /* buffer size */
663 avio_rl32(pb); /* quality */
664 if (ast->cum_len*ast->scale/ast->rate > 3600) {
665 av_log(s, AV_LOG_ERROR, "crazy start time, iam scared, giving up\n");
668 ast->sample_size = avio_rl32(pb); /* sample ssize */
669 ast->cum_len *= FFMAX(1, ast->sample_size);
670 av_dlog(s, "%"PRIu32" %"PRIu32" %d\n",
671 ast->rate, ast->scale, ast->sample_size);
674 case MKTAG('v', 'i', 'd', 's'):
675 codec_type = AVMEDIA_TYPE_VIDEO;
677 ast->sample_size = 0;
678 st->avg_frame_rate = av_inv_q(st->time_base);
680 case MKTAG('a', 'u', 'd', 's'):
681 codec_type = AVMEDIA_TYPE_AUDIO;
683 case MKTAG('t', 'x', 't', 's'):
684 codec_type = AVMEDIA_TYPE_SUBTITLE;
686 case MKTAG('d', 'a', 't', 's'):
687 codec_type = AVMEDIA_TYPE_DATA;
690 av_log(s, AV_LOG_INFO, "unknown stream type %X\n", tag1);
692 if (ast->sample_size == 0) {
693 st->duration = st->nb_frames;
694 if (st->duration > 0 && avi->io_fsize > 0 && avi->riff_end > avi->io_fsize) {
695 av_log(s, AV_LOG_DEBUG, "File is truncated adjusting duration\n");
696 st->duration = av_rescale(st->duration, avi->io_fsize, avi->riff_end);
699 ast->frame_offset = ast->cum_len;
700 avio_skip(pb, size - 12 * 4);
702 case MKTAG('s', 't', 'r', 'f'):
706 if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
709 uint64_t cur_pos = avio_tell(pb);
711 if (cur_pos < list_end)
712 size = FFMIN(size, list_end - cur_pos);
713 st = s->streams[stream_index];
714 if (st->codec->codec_type != AVMEDIA_TYPE_UNKNOWN) {
718 switch (codec_type) {
719 case AVMEDIA_TYPE_VIDEO:
720 if (amv_file_format) {
721 st->codec->width = avih_width;
722 st->codec->height = avih_height;
723 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
724 st->codec->codec_id = AV_CODEC_ID_AMV;
728 tag1 = ff_get_bmp_header(pb, st, &esize);
730 if (tag1 == MKTAG('D', 'X', 'S', 'B') ||
731 tag1 == MKTAG('D', 'X', 'S', 'A')) {
732 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
733 st->codec->codec_tag = tag1;
734 st->codec->codec_id = AV_CODEC_ID_XSUB;
738 if (size > 10 * 4 && size < (1 << 30) && size < avi->fsize) {
739 if (esize == size-1 && (esize&1)) {
740 st->codec->extradata_size = esize - 10 * 4;
742 st->codec->extradata_size = size - 10 * 4;
743 if (ff_get_extradata(st->codec, pb, st->codec->extradata_size) < 0)
744 return AVERROR(ENOMEM);
747 // FIXME: check if the encoder really did this correctly
748 if (st->codec->extradata_size & 1)
751 /* Extract palette from extradata if bpp <= 8.
752 * This code assumes that extradata contains only palette.
753 * This is true for all paletted codecs implemented in
755 if (st->codec->extradata_size &&
756 (st->codec->bits_per_coded_sample <= 8)) {
757 int pal_size = (1 << st->codec->bits_per_coded_sample) << 2;
758 const uint8_t *pal_src;
760 pal_size = FFMIN(pal_size, st->codec->extradata_size);
761 pal_src = st->codec->extradata +
762 st->codec->extradata_size - pal_size;
763 /* Exclude the "BottomUp" field from the palette */
764 if (pal_src - st->codec->extradata >= 9 &&
765 !memcmp(st->codec->extradata + st->codec->extradata_size - 9, "BottomUp", 9))
767 for (i = 0; i < pal_size / 4; i++)
768 ast->pal[i] = 0xFFU<<24 | AV_RL32(pal_src+4*i);
772 print_tag("video", tag1, 0);
774 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
775 st->codec->codec_tag = tag1;
776 st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags,
778 if (!st->codec->codec_id) {
779 st->codec->codec_id = ff_codec_get_id(ff_codec_movvideo_tags,
781 if (st->codec->codec_id)
782 av_log(s, AV_LOG_WARNING, "mov tag found in avi\n");
784 /* This is needed to get the pict type which is necessary
785 * for generating correct pts. */
786 st->need_parsing = AVSTREAM_PARSE_HEADERS;
788 if (st->codec->codec_id == AV_CODEC_ID_MPEG4 &&
789 ast->handler == MKTAG('X', 'V', 'I', 'D'))
790 st->codec->codec_tag = MKTAG('X', 'V', 'I', 'D');
792 if (st->codec->codec_tag == MKTAG('V', 'S', 'S', 'H'))
793 st->need_parsing = AVSTREAM_PARSE_FULL;
795 if (st->codec->codec_tag == 0 && st->codec->height > 0 &&
796 st->codec->extradata_size < 1U << 30) {
797 st->codec->extradata_size += 9;
798 if ((ret = av_reallocp(&st->codec->extradata,
799 st->codec->extradata_size +
800 FF_INPUT_BUFFER_PADDING_SIZE)) < 0) {
801 st->codec->extradata_size = 0;
804 memcpy(st->codec->extradata + st->codec->extradata_size - 9,
807 st->codec->height = FFABS(st->codec->height);
809 // avio_skip(pb, size - 5 * 4);
811 case AVMEDIA_TYPE_AUDIO:
812 ret = ff_get_wav_header(pb, st->codec, size, 0);
815 ast->dshow_block_align = st->codec->block_align;
816 if (ast->sample_size && st->codec->block_align &&
817 ast->sample_size != st->codec->block_align) {
820 "sample size (%d) != block align (%d)\n",
822 st->codec->block_align);
823 ast->sample_size = st->codec->block_align;
826 * (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
829 /* Force parsing as several audio frames can be in
830 * one packet and timestamps refer to packet start. */
831 st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
832 /* ADTS header is in extradata, AAC without header must be
833 * stored as exact frames. Parser not needed and it will
835 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
836 st->codec->extradata_size)
837 st->need_parsing = AVSTREAM_PARSE_NONE;
838 /* AVI files with Xan DPCM audio (wrongly) declare PCM
839 * audio in the header but have Axan as stream_code_tag. */
840 if (ast->handler == AV_RL32("Axan")) {
841 st->codec->codec_id = AV_CODEC_ID_XAN_DPCM;
842 st->codec->codec_tag = 0;
843 ast->dshow_block_align = 0;
845 if (amv_file_format) {
846 st->codec->codec_id = AV_CODEC_ID_ADPCM_IMA_AMV;
847 ast->dshow_block_align = 0;
849 if (st->codec->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align <= 4 && ast->dshow_block_align) {
850 av_log(s, AV_LOG_DEBUG, "overriding invalid dshow_block_align of %d\n", ast->dshow_block_align);
851 ast->dshow_block_align = 0;
853 if (st->codec->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align == 1024 && ast->sample_size == 1024 ||
854 st->codec->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align == 4096 && ast->sample_size == 4096 ||
855 st->codec->codec_id == AV_CODEC_ID_MP3 && ast->dshow_block_align == 1152 && ast->sample_size == 1152) {
856 av_log(s, AV_LOG_DEBUG, "overriding sample_size\n");
857 ast->sample_size = 0;
860 case AVMEDIA_TYPE_SUBTITLE:
861 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
862 st->request_probe= 1;
866 st->codec->codec_type = AVMEDIA_TYPE_DATA;
867 st->codec->codec_id = AV_CODEC_ID_NONE;
868 st->codec->codec_tag = 0;
874 case MKTAG('s', 't', 'r', 'd'):
875 if (stream_index >= (unsigned)s->nb_streams
876 || s->streams[stream_index]->codec->extradata_size
877 || s->streams[stream_index]->codec->codec_tag == MKTAG('H','2','6','4')) {
880 uint64_t cur_pos = avio_tell(pb);
881 if (cur_pos < list_end)
882 size = FFMIN(size, list_end - cur_pos);
883 st = s->streams[stream_index];
886 if (ff_get_extradata(st->codec, pb, size) < 0)
887 return AVERROR(ENOMEM);
890 if (st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
893 ret = avi_extract_stream_metadata(st);
895 av_log(s, AV_LOG_WARNING, "could not decoding EXIF data in stream header.\n");
899 case MKTAG('i', 'n', 'd', 'x'):
901 if (pb->seekable && !(s->flags & AVFMT_FLAG_IGNIDX) &&
903 read_braindead_odml_indx(s, 0) < 0 &&
904 (s->error_recognition & AV_EF_EXPLODE))
906 avio_seek(pb, i + size, SEEK_SET);
908 case MKTAG('v', 'p', 'r', 'p'):
909 if (stream_index < (unsigned)s->nb_streams && size > 9 * 4) {
910 AVRational active, active_aspect;
912 st = s->streams[stream_index];
919 active_aspect.den = avio_rl16(pb);
920 active_aspect.num = avio_rl16(pb);
921 active.num = avio_rl32(pb);
922 active.den = avio_rl32(pb);
923 avio_rl32(pb); // nbFieldsPerFrame
925 if (active_aspect.num && active_aspect.den &&
926 active.num && active.den) {
927 st->sample_aspect_ratio = av_div_q(active_aspect, active);
928 av_dlog(s, "vprp %d/%d %d/%d\n",
929 active_aspect.num, active_aspect.den,
930 active.num, active.den);
936 case MKTAG('s', 't', 'r', 'n'):
938 ret = avi_read_tag(s, s->streams[s->nb_streams - 1], tag, size);
944 if (size > 1000000) {
945 av_log(s, AV_LOG_ERROR,
946 "Something went wrong during header parsing, "
947 "I will ignore it and try to continue anyway.\n");
948 if (s->error_recognition & AV_EF_EXPLODE)
950 avi->movi_list = avio_tell(pb) - 4;
951 avi->movi_end = avi->fsize;
962 /* check stream number */
963 if (stream_index != s->nb_streams - 1) {
966 return AVERROR_INVALIDDATA;
969 if (!avi->index_loaded && pb->seekable)
971 calculate_bitrate(s);
972 avi->index_loaded |= 1;
974 if ((ret = guess_ni_flag(s)) < 0)
977 avi->non_interleaved |= ret | (s->flags & AVFMT_FLAG_SORT_DTS);
979 dict_entry = av_dict_get(s->metadata, "ISFT", NULL, 0);
980 if (dict_entry && !strcmp(dict_entry->value, "PotEncoder"))
981 for (i = 0; i < s->nb_streams; i++) {
982 AVStream *st = s->streams[i];
983 if ( st->codec->codec_id == AV_CODEC_ID_MPEG1VIDEO
984 || st->codec->codec_id == AV_CODEC_ID_MPEG2VIDEO)
985 st->need_parsing = AVSTREAM_PARSE_FULL;
988 for (i = 0; i < s->nb_streams; i++) {
989 AVStream *st = s->streams[i];
990 if (st->nb_index_entries)
993 // DV-in-AVI cannot be non-interleaved, if set this must be
996 avi->non_interleaved = 0;
997 if (i == s->nb_streams && avi->non_interleaved) {
998 av_log(s, AV_LOG_WARNING,
999 "Non-interleaved AVI without index, switching to interleaved\n");
1000 avi->non_interleaved = 0;
1003 if (avi->non_interleaved) {
1004 av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
1008 ff_metadata_conv_ctx(s, NULL, avi_metadata_conv);
1009 ff_metadata_conv_ctx(s, NULL, ff_riff_info_conv);
1014 static int read_gab2_sub(AVFormatContext *s, AVStream *st, AVPacket *pkt)
1016 if (pkt->size >= 7 &&
1017 pkt->size < INT_MAX - AVPROBE_PADDING_SIZE &&
1018 !strcmp(pkt->data, "GAB2") && AV_RL16(pkt->data + 5) == 2) {
1020 int score = AVPROBE_SCORE_EXTENSION, ret;
1021 AVIStream *ast = st->priv_data;
1022 AVInputFormat *sub_demuxer;
1023 AVRational time_base;
1025 AVIOContext *pb = avio_alloc_context(pkt->data + 7,
1027 0, NULL, NULL, NULL, NULL);
1029 unsigned int desc_len = avio_rl32(pb);
1031 if (desc_len > pb->buf_end - pb->buf_ptr)
1034 ret = avio_get_str16le(pb, desc_len, desc, sizeof(desc));
1035 avio_skip(pb, desc_len - ret);
1037 av_dict_set(&st->metadata, "title", desc, 0);
1039 avio_rl16(pb); /* flags? */
1040 avio_rl32(pb); /* data size */
1042 size = pb->buf_end - pb->buf_ptr;
1043 pd = (AVProbeData) { .buf = av_mallocz(size + AVPROBE_PADDING_SIZE),
1047 memcpy(pd.buf, pb->buf_ptr, size);
1048 sub_demuxer = av_probe_input_format2(&pd, 1, &score);
1053 if (!(ast->sub_ctx = avformat_alloc_context()))
1056 ast->sub_ctx->pb = pb;
1058 if (ff_copy_whitelists(ast->sub_ctx, s) < 0)
1061 if (!avformat_open_input(&ast->sub_ctx, "", sub_demuxer, NULL)) {
1062 ff_read_packet(ast->sub_ctx, &ast->sub_pkt);
1063 *st->codec = *ast->sub_ctx->streams[0]->codec;
1064 ast->sub_ctx->streams[0]->codec->extradata = NULL;
1065 time_base = ast->sub_ctx->streams[0]->time_base;
1066 avpriv_set_pts_info(st, 64, time_base.num, time_base.den);
1068 ast->sub_buffer = pkt->data;
1069 memset(pkt, 0, sizeof(*pkt));
1073 av_freep(&ast->sub_ctx);
1079 static AVStream *get_subtitle_pkt(AVFormatContext *s, AVStream *next_st,
1082 AVIStream *ast, *next_ast = next_st->priv_data;
1083 int64_t ts, next_ts, ts_min = INT64_MAX;
1084 AVStream *st, *sub_st = NULL;
1087 next_ts = av_rescale_q(next_ast->frame_offset, next_st->time_base,
1090 for (i = 0; i < s->nb_streams; i++) {
1092 ast = st->priv_data;
1093 if (st->discard < AVDISCARD_ALL && ast && ast->sub_pkt.data) {
1094 ts = av_rescale_q(ast->sub_pkt.dts, st->time_base, AV_TIME_BASE_Q);
1095 if (ts <= next_ts && ts < ts_min) {
1103 ast = sub_st->priv_data;
1104 *pkt = ast->sub_pkt;
1105 pkt->stream_index = sub_st->index;
1107 if (ff_read_packet(ast->sub_ctx, &ast->sub_pkt) < 0)
1108 ast->sub_pkt.data = NULL;
1113 static int get_stream_idx(const unsigned *d)
1115 if (d[0] >= '0' && d[0] <= '9' &&
1116 d[1] >= '0' && d[1] <= '9') {
1117 return (d[0] - '0') * 10 + (d[1] - '0');
1119 return 100; // invalid stream ID
1125 * @param exit_early set to 1 to just gather packet position without making the changes needed to actually read & return the packet
1127 static int avi_sync(AVFormatContext *s, int exit_early)
1129 AVIContext *avi = s->priv_data;
1130 AVIOContext *pb = s->pb;
1137 memset(d, -1, sizeof(d));
1138 for (i = sync = avio_tell(pb); !avio_feof(pb); i++) {
1141 for (j = 0; j < 7; j++)
1145 size = d[4] + (d[5] << 8) + (d[6] << 16) + (d[7] << 24);
1147 n = get_stream_idx(d + 2);
1148 av_dlog(s, "%X %X %X %X %X %X %X %X %"PRId64" %u %d\n",
1149 d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], i, size, n);
1150 if (i*(avi->io_fsize>0) + (uint64_t)size > avi->fsize || d[0] > 127)
1154 if ((d[0] == 'i' && d[1] == 'x' && n < s->nb_streams) ||
1156 (d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K') ||
1157 (d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')) {
1158 avio_skip(pb, size);
1163 if (d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T') {
1168 n = get_stream_idx(d);
1170 if (!((i - avi->last_pkt_pos) & 1) &&
1171 get_stream_idx(d + 1) < s->nb_streams)
1174 // detect ##ix chunk and skip
1175 if (d[2] == 'i' && d[3] == 'x' && n < s->nb_streams) {
1176 avio_skip(pb, size);
1180 if (avi->dv_demux && n != 0)
1184 if (n < s->nb_streams) {
1188 ast = st->priv_data;
1191 av_log(s, AV_LOG_WARNING, "Skipping foreign stream %d packet\n", n);
1195 if (s->nb_streams >= 2) {
1196 AVStream *st1 = s->streams[1];
1197 AVIStream *ast1 = st1->priv_data;
1198 // workaround for broken small-file-bug402.avi
1199 if ( d[2] == 'w' && d[3] == 'b'
1201 && st ->codec->codec_type == AVMEDIA_TYPE_VIDEO
1202 && st1->codec->codec_type == AVMEDIA_TYPE_AUDIO
1203 && ast->prefix == 'd'*256+'c'
1204 && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
1209 av_log(s, AV_LOG_WARNING,
1210 "Invalid stream + prefix combination, assuming audio.\n");
1214 if (!avi->dv_demux &&
1215 ((st->discard >= AVDISCARD_DEFAULT && size == 0) /* ||
1216 // FIXME: needs a little reordering
1217 (st->discard >= AVDISCARD_NONKEY &&
1218 !(pkt->flags & AV_PKT_FLAG_KEY)) */
1219 || st->discard >= AVDISCARD_ALL)) {
1221 ast->frame_offset += get_duration(ast, size);
1222 avio_skip(pb, size);
1227 if (d[2] == 'p' && d[3] == 'c' && size <= 4 * 256 + 4) {
1228 int k = avio_r8(pb);
1229 int last = (k + avio_r8(pb) - 1) & 0xFF;
1231 avio_rl16(pb); // flags
1233 // b + (g << 8) + (r << 16);
1234 for (; k <= last; k++)
1235 ast->pal[k] = 0xFFU<<24 | avio_rb32(pb)>>8;
1239 } else if (((ast->prefix_count < 5 || sync + 9 > i) &&
1240 d[2] < 128 && d[3] < 128) ||
1241 d[2] * 256 + d[3] == ast->prefix /* ||
1242 (d[2] == 'd' && d[3] == 'c') ||
1243 (d[2] == 'w' && d[3] == 'b') */) {
1246 if (d[2] * 256 + d[3] == ast->prefix)
1247 ast->prefix_count++;
1249 ast->prefix = d[2] * 256 + d[3];
1250 ast->prefix_count = 0;
1253 avi->stream_index = n;
1254 ast->packet_size = size + 8;
1255 ast->remaining = size;
1258 uint64_t pos = avio_tell(pb) - 8;
1259 if (!st->index_entries || !st->nb_index_entries ||
1260 st->index_entries[st->nb_index_entries - 1].pos < pos) {
1261 av_add_index_entry(st, pos, ast->frame_offset, size,
1262 0, AVINDEX_KEYFRAME);
1275 static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
1277 AVIContext *avi = s->priv_data;
1278 AVIOContext *pb = s->pb;
1280 #if FF_API_DESTRUCT_PACKET
1284 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1285 int size = avpriv_dv_get_packet(avi->dv_demux, pkt);
1292 if (avi->non_interleaved) {
1293 int best_stream_index = 0;
1294 AVStream *best_st = NULL;
1295 AVIStream *best_ast;
1296 int64_t best_ts = INT64_MAX;
1299 for (i = 0; i < s->nb_streams; i++) {
1300 AVStream *st = s->streams[i];
1301 AVIStream *ast = st->priv_data;
1302 int64_t ts = ast->frame_offset;
1305 if (!st->nb_index_entries)
1308 last_ts = st->index_entries[st->nb_index_entries - 1].timestamp;
1309 if (!ast->remaining && ts > last_ts)
1312 ts = av_rescale_q(ts, st->time_base,
1313 (AVRational) { FFMAX(1, ast->sample_size),
1316 av_dlog(s, "%"PRId64" %d/%d %"PRId64"\n", ts,
1317 st->time_base.num, st->time_base.den, ast->frame_offset);
1321 best_stream_index = i;
1327 best_ast = best_st->priv_data;
1328 best_ts = best_ast->frame_offset;
1329 if (best_ast->remaining) {
1330 i = av_index_search_timestamp(best_st,
1333 AVSEEK_FLAG_BACKWARD);
1335 i = av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
1337 best_ast->frame_offset = best_st->index_entries[i].timestamp;
1341 int64_t pos = best_st->index_entries[i].pos;
1342 pos += best_ast->packet_size - best_ast->remaining;
1343 if (avio_seek(s->pb, pos + 8, SEEK_SET) < 0)
1346 av_assert0(best_ast->remaining <= best_ast->packet_size);
1348 avi->stream_index = best_stream_index;
1349 if (!best_ast->remaining)
1350 best_ast->packet_size =
1351 best_ast->remaining = best_st->index_entries[i].size;
1358 if (avi->stream_index >= 0) {
1359 AVStream *st = s->streams[avi->stream_index];
1360 AVIStream *ast = st->priv_data;
1363 if (get_subtitle_pkt(s, st, pkt))
1366 // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
1367 if (ast->sample_size <= 1)
1369 else if (ast->sample_size < 32)
1370 // arbitrary multiplier to avoid tiny packets for raw PCM data
1371 size = 1024 * ast->sample_size;
1373 size = ast->sample_size;
1375 if (size > ast->remaining)
1376 size = ast->remaining;
1377 avi->last_pkt_pos = avio_tell(pb);
1378 err = av_get_packet(pb, pkt, size);
1383 if (ast->has_pal && pkt->size < (unsigned)INT_MAX / 2) {
1385 pal = av_packet_new_side_data(pkt,
1386 AV_PKT_DATA_PALETTE,
1389 av_log(s, AV_LOG_ERROR,
1390 "Failed to allocate data for palette\n");
1392 memcpy(pal, ast->pal, AVPALETTE_SIZE);
1397 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1398 AVBufferRef *avbuf = pkt->buf;
1399 #if FF_API_DESTRUCT_PACKET
1400 FF_DISABLE_DEPRECATION_WARNINGS
1401 dstr = pkt->destruct;
1402 FF_ENABLE_DEPRECATION_WARNINGS
1404 size = avpriv_dv_produce_packet(avi->dv_demux, pkt,
1405 pkt->data, pkt->size, pkt->pos);
1406 #if FF_API_DESTRUCT_PACKET
1407 FF_DISABLE_DEPRECATION_WARNINGS
1408 pkt->destruct = dstr;
1409 FF_ENABLE_DEPRECATION_WARNINGS
1412 pkt->flags |= AV_PKT_FLAG_KEY;
1414 av_free_packet(pkt);
1415 } else if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE &&
1416 !st->codec->codec_tag && read_gab2_sub(s, st, pkt)) {
1417 ast->frame_offset++;
1418 avi->stream_index = -1;
1422 /* XXX: How to handle B-frames in AVI? */
1423 pkt->dts = ast->frame_offset;
1424 // pkt->dts += ast->start;
1425 if (ast->sample_size)
1426 pkt->dts /= ast->sample_size;
1428 "dts:%"PRId64" offset:%"PRId64" %d/%d smpl_siz:%d "
1429 "base:%d st:%d size:%d\n",
1438 pkt->stream_index = avi->stream_index;
1440 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && st->index_entries) {
1444 index = av_index_search_timestamp(st, ast->frame_offset, AVSEEK_FLAG_ANY);
1445 e = &st->index_entries[index];
1447 if (index >= 0 && e->timestamp == ast->frame_offset) {
1448 if (index == st->nb_index_entries-1) {
1451 if (st->codec->codec_id == AV_CODEC_ID_MPEG4) {
1452 const uint8_t *ptr = pkt->data, *end = ptr + FFMIN(size, 256);
1454 ptr = avpriv_find_start_code(ptr, end, &state);
1455 if (state == 0x1B6 && ptr < end) {
1456 key = !(*ptr & 0xC0);
1462 e->flags &= ~AVINDEX_KEYFRAME;
1464 if (e->flags & AVINDEX_KEYFRAME)
1465 pkt->flags |= AV_PKT_FLAG_KEY;
1468 pkt->flags |= AV_PKT_FLAG_KEY;
1470 ast->frame_offset += get_duration(ast, pkt->size);
1472 ast->remaining -= err;
1473 if (!ast->remaining) {
1474 avi->stream_index = -1;
1475 ast->packet_size = 0;
1478 if (!avi->non_interleaved && pkt->pos >= 0 && ast->seek_pos > pkt->pos) {
1479 av_free_packet(pkt);
1484 if (!avi->non_interleaved && st->nb_index_entries>1 && avi->index_loaded>1) {
1485 int64_t dts= av_rescale_q(pkt->dts, st->time_base, AV_TIME_BASE_Q);
1487 if (avi->dts_max - dts > 2*AV_TIME_BASE) {
1488 avi->non_interleaved= 1;
1489 av_log(s, AV_LOG_INFO, "Switching to NI mode, due to poor interleaving\n");
1490 }else if (avi->dts_max < dts)
1497 if ((err = avi_sync(s, 0)) < 0)
1502 /* XXX: We make the implicit supposition that the positions are sorted
1503 * for each stream. */
1504 static int avi_read_idx1(AVFormatContext *s, int size)
1506 AVIContext *avi = s->priv_data;
1507 AVIOContext *pb = s->pb;
1508 int nb_index_entries, i;
1511 unsigned int index, tag, flags, pos, len, first_packet = 1;
1512 unsigned last_pos = -1;
1513 unsigned last_idx = -1;
1514 int64_t idx1_pos, first_packet_pos = 0, data_offset = 0;
1517 nb_index_entries = size / 16;
1518 if (nb_index_entries <= 0)
1519 return AVERROR_INVALIDDATA;
1521 idx1_pos = avio_tell(pb);
1522 avio_seek(pb, avi->movi_list + 4, SEEK_SET);
1523 if (avi_sync(s, 1) == 0)
1524 first_packet_pos = avio_tell(pb) - 8;
1525 avi->stream_index = -1;
1526 avio_seek(pb, idx1_pos, SEEK_SET);
1528 if (s->nb_streams == 1 && s->streams[0]->codec->codec_tag == AV_RL32("MMES")) {
1529 first_packet_pos = 0;
1530 data_offset = avi->movi_list;
1533 /* Read the entries and sort them in each stream component. */
1534 for (i = 0; i < nb_index_entries; i++) {
1538 tag = avio_rl32(pb);
1539 flags = avio_rl32(pb);
1540 pos = avio_rl32(pb);
1541 len = avio_rl32(pb);
1542 av_dlog(s, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
1543 i, tag, flags, pos, len);
1545 index = ((tag & 0xff) - '0') * 10;
1546 index += (tag >> 8 & 0xff) - '0';
1547 if (index >= s->nb_streams)
1549 st = s->streams[index];
1550 ast = st->priv_data;
1552 if (first_packet && first_packet_pos) {
1553 data_offset = first_packet_pos - pos;
1558 av_dlog(s, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
1560 // even if we have only a single stream, we should
1561 // switch to non-interleaved to get correct timestamps
1562 if (last_pos == pos)
1563 avi->non_interleaved = 1;
1564 if (last_idx != pos && len) {
1565 av_add_index_entry(st, pos, ast->cum_len, len, 0,
1566 (flags & AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
1569 ast->cum_len += get_duration(ast, len);
1571 anykey |= flags&AVIIF_INDEX;
1574 for (index = 0; index < s->nb_streams; index++) {
1575 st = s->streams[index];
1576 if (st->nb_index_entries)
1577 st->index_entries[0].flags |= AVINDEX_KEYFRAME;
1583 /* Scan the index and consider any file with streams more than
1584 * 2 seconds or 64MB apart non-interleaved. */
1585 static int check_stream_max_drift(AVFormatContext *s)
1587 int64_t min_pos, pos;
1589 int *idx = av_mallocz_array(s->nb_streams, sizeof(*idx));
1591 return AVERROR(ENOMEM);
1592 for (min_pos = pos = 0; min_pos != INT64_MAX; pos = min_pos + 1LU) {
1593 int64_t max_dts = INT64_MIN / 2;
1594 int64_t min_dts = INT64_MAX / 2;
1595 int64_t max_buffer = 0;
1597 min_pos = INT64_MAX;
1599 for (i = 0; i < s->nb_streams; i++) {
1600 AVStream *st = s->streams[i];
1601 AVIStream *ast = st->priv_data;
1602 int n = st->nb_index_entries;
1603 while (idx[i] < n && st->index_entries[idx[i]].pos < pos)
1607 dts = av_rescale_q(st->index_entries[idx[i]].timestamp /
1608 FFMAX(ast->sample_size, 1),
1609 st->time_base, AV_TIME_BASE_Q);
1610 min_dts = FFMIN(min_dts, dts);
1611 min_pos = FFMIN(min_pos, st->index_entries[idx[i]].pos);
1614 for (i = 0; i < s->nb_streams; i++) {
1615 AVStream *st = s->streams[i];
1616 AVIStream *ast = st->priv_data;
1618 if (idx[i] && min_dts != INT64_MAX / 2) {
1620 dts = av_rescale_q(st->index_entries[idx[i] - 1].timestamp /
1621 FFMAX(ast->sample_size, 1),
1622 st->time_base, AV_TIME_BASE_Q);
1623 max_dts = FFMAX(max_dts, dts);
1624 max_buffer = FFMAX(max_buffer,
1625 av_rescale(dts - min_dts,
1626 st->codec->bit_rate,
1630 if (max_dts - min_dts > 2 * AV_TIME_BASE ||
1631 max_buffer > 1024 * 1024 * 8 * 8) {
1640 static int guess_ni_flag(AVFormatContext *s)
1643 int64_t last_start = 0;
1644 int64_t first_end = INT64_MAX;
1645 int64_t oldpos = avio_tell(s->pb);
1647 for (i = 0; i < s->nb_streams; i++) {
1648 AVStream *st = s->streams[i];
1649 int n = st->nb_index_entries;
1656 int64_t pos = st->index_entries[0].pos;
1657 avio_seek(s->pb, pos + 4, SEEK_SET);
1658 size = avio_rl32(s->pb);
1659 if (pos + size > st->index_entries[1].pos)
1660 last_start = INT64_MAX;
1663 if (st->index_entries[0].pos > last_start)
1664 last_start = st->index_entries[0].pos;
1665 if (st->index_entries[n - 1].pos < first_end)
1666 first_end = st->index_entries[n - 1].pos;
1668 avio_seek(s->pb, oldpos, SEEK_SET);
1670 if (last_start > first_end)
1673 return check_stream_max_drift(s);
1676 static int avi_load_index(AVFormatContext *s)
1678 AVIContext *avi = s->priv_data;
1679 AVIOContext *pb = s->pb;
1681 int64_t pos = avio_tell(pb);
1685 if (avio_seek(pb, avi->movi_end, SEEK_SET) < 0)
1686 goto the_end; // maybe truncated file
1687 av_dlog(s, "movi_end=0x%"PRIx64"\n", avi->movi_end);
1689 tag = avio_rl32(pb);
1690 size = avio_rl32(pb);
1693 next = avio_tell(pb) + size + (size & 1);
1695 av_dlog(s, "tag=%c%c%c%c size=0x%x\n",
1702 if (tag == MKTAG('i', 'd', 'x', '1') &&
1703 avi_read_idx1(s, size) >= 0) {
1704 avi->index_loaded=2;
1706 }else if (tag == MKTAG('L', 'I', 'S', 'T')) {
1707 uint32_t tag1 = avio_rl32(pb);
1709 if (tag1 == MKTAG('I', 'N', 'F', 'O'))
1710 ff_read_riff_info(s, size - 4);
1714 if (avio_seek(pb, next, SEEK_SET) < 0)
1715 break; // something is wrong here
1719 avio_seek(pb, pos, SEEK_SET);
1723 static void seek_subtitle(AVStream *st, AVStream *st2, int64_t timestamp)
1725 AVIStream *ast2 = st2->priv_data;
1726 int64_t ts2 = av_rescale_q(timestamp, st->time_base, st2->time_base);
1727 av_free_packet(&ast2->sub_pkt);
1728 if (avformat_seek_file(ast2->sub_ctx, 0, INT64_MIN, ts2, ts2, 0) >= 0 ||
1729 avformat_seek_file(ast2->sub_ctx, 0, ts2, ts2, INT64_MAX, 0) >= 0)
1730 ff_read_packet(ast2->sub_ctx, &ast2->sub_pkt);
1733 static int avi_read_seek(AVFormatContext *s, int stream_index,
1734 int64_t timestamp, int flags)
1736 AVIContext *avi = s->priv_data;
1739 int64_t pos, pos_min;
1742 /* Does not matter which stream is requested dv in avi has the
1743 * stream information in the first video stream.
1748 if (!avi->index_loaded) {
1749 /* we only load the index on demand */
1751 avi->index_loaded |= 1;
1753 av_assert0(stream_index >= 0);
1755 st = s->streams[stream_index];
1756 ast = st->priv_data;
1757 index = av_index_search_timestamp(st,
1758 timestamp * FFMAX(ast->sample_size, 1),
1761 if (st->nb_index_entries > 0)
1762 av_log(s, AV_LOG_DEBUG, "Failed to find timestamp %"PRId64 " in index %"PRId64 " .. %"PRId64 "\n",
1763 timestamp * FFMAX(ast->sample_size, 1),
1764 st->index_entries[0].timestamp,
1765 st->index_entries[st->nb_index_entries - 1].timestamp);
1766 return AVERROR_INVALIDDATA;
1769 /* find the position */
1770 pos = st->index_entries[index].pos;
1771 timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1);
1773 av_dlog(s, "XX %"PRId64" %d %"PRId64"\n",
1774 timestamp, index, st->index_entries[index].timestamp);
1776 if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1777 /* One and only one real stream for DV in AVI, and it has video */
1778 /* offsets. Calling with other stream indexes should have failed */
1779 /* the av_index_search_timestamp call above. */
1781 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
1784 /* Feed the DV video stream version of the timestamp to the */
1785 /* DV demux so it can synthesize correct timestamps. */
1786 ff_dv_offset_reset(avi->dv_demux, timestamp);
1788 avi->stream_index = -1;
1793 for (i = 0; i < s->nb_streams; i++) {
1794 AVStream *st2 = s->streams[i];
1795 AVIStream *ast2 = st2->priv_data;
1798 ast2->remaining = 0;
1800 if (ast2->sub_ctx) {
1801 seek_subtitle(st, st2, timestamp);
1805 if (st2->nb_index_entries <= 0)
1808 // av_assert1(st2->codec->block_align);
1809 av_assert0(fabs(av_q2d(st2->time_base) - ast2->scale / (double)ast2->rate) < av_q2d(st2->time_base) * 0.00000001);
1810 index = av_index_search_timestamp(st2,
1811 av_rescale_q(timestamp,
1814 FFMAX(ast2->sample_size, 1),
1816 AVSEEK_FLAG_BACKWARD |
1817 (st2->codec->codec_type != AVMEDIA_TYPE_VIDEO ? AVSEEK_FLAG_ANY : 0));
1820 ast2->seek_pos = st2->index_entries[index].pos;
1821 pos_min = FFMIN(pos_min,ast2->seek_pos);
1823 for (i = 0; i < s->nb_streams; i++) {
1824 AVStream *st2 = s->streams[i];
1825 AVIStream *ast2 = st2->priv_data;
1827 if (ast2->sub_ctx || st2->nb_index_entries <= 0)
1830 index = av_index_search_timestamp(
1832 av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
1833 flags | AVSEEK_FLAG_BACKWARD | (st2->codec->codec_type != AVMEDIA_TYPE_VIDEO ? AVSEEK_FLAG_ANY : 0));
1836 while (!avi->non_interleaved && index>0 && st2->index_entries[index-1].pos >= pos_min)
1838 ast2->frame_offset = st2->index_entries[index].timestamp;
1842 if (avio_seek(s->pb, pos_min, SEEK_SET) < 0) {
1843 av_log(s, AV_LOG_ERROR, "Seek failed\n");
1846 avi->stream_index = -1;
1847 avi->dts_max = INT_MIN;
1851 static int avi_read_close(AVFormatContext *s)
1854 AVIContext *avi = s->priv_data;
1856 for (i = 0; i < s->nb_streams; i++) {
1857 AVStream *st = s->streams[i];
1858 AVIStream *ast = st->priv_data;
1861 av_freep(&ast->sub_ctx->pb);
1862 avformat_close_input(&ast->sub_ctx);
1864 av_freep(&ast->sub_buffer);
1865 av_free_packet(&ast->sub_pkt);
1869 av_freep(&avi->dv_demux);
1874 static int avi_probe(AVProbeData *p)
1878 /* check file header */
1879 for (i = 0; avi_headers[i][0]; i++)
1880 if (AV_RL32(p->buf ) == AV_RL32(avi_headers[i] ) &&
1881 AV_RL32(p->buf + 8) == AV_RL32(avi_headers[i] + 4))
1882 return AVPROBE_SCORE_MAX;
1887 AVInputFormat ff_avi_demuxer = {
1889 .long_name = NULL_IF_CONFIG_SMALL("AVI (Audio Video Interleaved)"),
1890 .priv_data_size = sizeof(AVIContext),
1891 .extensions = "avi",
1892 .read_probe = avi_probe,
1893 .read_header = avi_read_header,
1894 .read_packet = avi_read_packet,
1895 .read_close = avi_read_close,
1896 .read_seek = avi_read_seek,
1897 .priv_class = &demuxer_class,