LCOV - code coverage report
Current view: top level - src/libavformat - avidec.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 806 1116 72.2 %
Date: 2017-01-24 04:42:20 Functions: 21 24 87.5 %

          Line data    Source code
       1             : /*
       2             :  * AVI demuxer
       3             :  * Copyright (c) 2001 Fabrice Bellard
       4             :  *
       5             :  * This file is part of FFmpeg.
       6             :  *
       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.
      11             :  *
      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.
      16             :  *
      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
      20             :  */
      21             : 
      22             : #include <inttypes.h>
      23             : 
      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"
      32             : #include "avformat.h"
      33             : #include "avi.h"
      34             : #include "dv.h"
      35             : #include "internal.h"
      36             : #include "isom.h"
      37             : #include "riff.h"
      38             : #include "libavcodec/bytestream.h"
      39             : #include "libavcodec/exif.h"
      40             : #include "libavcodec/internal.h"
      41             : 
      42             : typedef struct AVIStream {
      43             :     int64_t frame_offset;   /* current frame (video) or byte (audio) counter
      44             :                              * (used to compute the pts) */
      45             :     int remaining;
      46             :     int packet_size;
      47             : 
      48             :     uint32_t handler;
      49             :     uint32_t scale;
      50             :     uint32_t rate;
      51             :     int sample_size;        /* size of one sample (or packet)
      52             :                              * (in the rate/scale sense) in bytes */
      53             : 
      54             :     int64_t cum_len;        /* temporary storage (used during seek) */
      55             :     int prefix;             /* normally 'd'<<8 + 'c' or 'w'<<8 + 'b' */
      56             :     int prefix_count;
      57             :     uint32_t pal[256];
      58             :     int has_pal;
      59             :     int dshow_block_align;  /* block align variable used to emulate bugs in
      60             :                              * the MS dshow demuxer */
      61             : 
      62             :     AVFormatContext *sub_ctx;
      63             :     AVPacket sub_pkt;
      64             :     uint8_t *sub_buffer;
      65             : 
      66             :     int64_t seek_pos;
      67             : } AVIStream;
      68             : 
      69             : typedef struct AVIContext {
      70             :     const AVClass *class;
      71             :     int64_t riff_end;
      72             :     int64_t movi_end;
      73             :     int64_t fsize;
      74             :     int64_t io_fsize;
      75             :     int64_t movi_list;
      76             :     int64_t last_pkt_pos;
      77             :     int index_loaded;
      78             :     int is_odml;
      79             :     int non_interleaved;
      80             :     int stream_index;
      81             :     DVDemuxContext *dv_demux;
      82             :     int odml_depth;
      83             :     int use_odml;
      84             : #define MAX_ODML_DEPTH 1000
      85             :     int64_t dts_max;
      86             : } AVIContext;
      87             : 
      88             : 
      89             : static const AVOption options[] = {
      90             :     { "use_odml", "use odml index", offsetof(AVIContext, use_odml), AV_OPT_TYPE_BOOL, {.i64 = 1}, -1, 1, AV_OPT_FLAG_DECODING_PARAM},
      91             :     { NULL },
      92             : };
      93             : 
      94             : static const AVClass demuxer_class = {
      95             :     .class_name = "avi",
      96             :     .item_name  = av_default_item_name,
      97             :     .option     = options,
      98             :     .version    = LIBAVUTIL_VERSION_INT,
      99             :     .category   = AV_CLASS_CATEGORY_DEMUXER,
     100             : };
     101             : 
     102             : 
     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', ' '  },
     109             :     { 0 }
     110             : };
     111             : 
     112             : static const AVMetadataConv avi_metadata_conv[] = {
     113             :     { "strn", "title" },
     114             :     { 0 },
     115             : };
     116             : 
     117             : static int avi_load_index(AVFormatContext *s);
     118             : static int guess_ni_flag(AVFormatContext *s);
     119             : 
     120             : #define print_tag(str, tag, size)                        \
     121             :     av_log(NULL, AV_LOG_TRACE, "pos:%"PRIX64" %s: tag=%c%c%c%c size=0x%x\n", \
     122             :             avio_tell(pb), str, tag & 0xff,              \
     123             :             (tag >> 8) & 0xff,                           \
     124             :             (tag >> 16) & 0xff,                          \
     125             :             (tag >> 24) & 0xff,                          \
     126             :             size)
     127             : 
     128       55771 : static inline int get_duration(AVIStream *ast, int len)
     129             : {
     130       55771 :     if (ast->sample_size)
     131        8590 :         return len;
     132       47181 :     else if (ast->dshow_block_align)
     133         212 :         return (len + ast->dshow_block_align - 1) / ast->dshow_block_align;
     134             :     else
     135       46969 :         return 1;
     136             : }
     137             : 
     138         394 : static int get_riff(AVFormatContext *s, AVIOContext *pb)
     139             : {
     140         394 :     AVIContext *avi = s->priv_data;
     141         394 :     char header[8] = {0};
     142             :     int i;
     143             : 
     144             :     /* check RIFF header */
     145         394 :     avio_read(pb, header, 4);
     146         394 :     avi->riff_end  = avio_rl32(pb); /* RIFF chunk size */
     147         394 :     avi->riff_end += avio_tell(pb); /* RIFF chunk end */
     148         394 :     avio_read(pb, header + 4, 4);
     149             : 
     150         402 :     for (i = 0; avi_headers[i][0]; i++)
     151         402 :         if (!memcmp(header, avi_headers[i], 8))
     152         394 :             break;
     153         394 :     if (!avi_headers[i][0])
     154           0 :         return AVERROR_INVALIDDATA;
     155             : 
     156         394 :     if (header[7] == 0x19)
     157           0 :         av_log(s, AV_LOG_INFO,
     158             :                "This file has been generated by a totally broken muxer.\n");
     159             : 
     160         394 :     return 0;
     161             : }
     162             : 
     163          36 : static int read_odml_index(AVFormatContext *s, int frame_num)
     164             : {
     165          36 :     AVIContext *avi     = s->priv_data;
     166          36 :     AVIOContext *pb     = s->pb;
     167          36 :     int longs_per_entry = avio_rl16(pb);
     168          36 :     int index_sub_type  = avio_r8(pb);
     169          36 :     int index_type      = avio_r8(pb);
     170          36 :     int entries_in_use  = avio_rl32(pb);
     171          36 :     int chunk_id        = avio_rl32(pb);
     172          36 :     int64_t base        = avio_rl64(pb);
     173          72 :     int stream_id       = ((chunk_id      & 0xFF) - '0') * 10 +
     174          36 :                           ((chunk_id >> 8 & 0xFF) - '0');
     175             :     AVStream *st;
     176             :     AVIStream *ast;
     177             :     int i;
     178          36 :     int64_t last_pos = -1;
     179          36 :     int64_t filesize = avi->fsize;
     180             : 
     181          36 :     av_log(s, AV_LOG_TRACE,
     182             :             "longs_per_entry:%d index_type:%d entries_in_use:%d "
     183             :             "chunk_id:%X base:%16"PRIX64" frame_num:%d\n",
     184             :             longs_per_entry,
     185             :             index_type,
     186             :             entries_in_use,
     187             :             chunk_id,
     188             :             base,
     189             :             frame_num);
     190             : 
     191          36 :     if (stream_id >= s->nb_streams || stream_id < 0)
     192           9 :         return AVERROR_INVALIDDATA;
     193          27 :     st  = s->streams[stream_id];
     194          27 :     ast = st->priv_data;
     195             : 
     196          27 :     if (index_sub_type)
     197           0 :         return AVERROR_INVALIDDATA;
     198             : 
     199          27 :     avio_rl32(pb);
     200             : 
     201          27 :     if (index_type && longs_per_entry != 2)
     202           0 :         return AVERROR_INVALIDDATA;
     203          27 :     if (index_type > 1)
     204           0 :         return AVERROR_INVALIDDATA;
     205             : 
     206          27 :     if (filesize > 0 && base >= filesize) {
     207           0 :         av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
     208           0 :         if (base >> 32 == (base & 0xFFFFFFFF) &&
     209           0 :             (base & 0xFFFFFFFF) < filesize    &&
     210             :             filesize <= 0xFFFFFFFF)
     211           0 :             base &= 0xFFFFFFFF;
     212             :         else
     213           0 :             return AVERROR_INVALIDDATA;
     214             :     }
     215             : 
     216        5720 :     for (i = 0; i < entries_in_use; i++) {
     217        5693 :         if (index_type) {
     218        5675 :             int64_t pos = avio_rl32(pb) + base - 8;
     219        5675 :             int len     = avio_rl32(pb);
     220        5675 :             int key     = len >= 0;
     221        5675 :             len &= 0x7FFFFFFF;
     222             : 
     223        5675 :             av_log(s, AV_LOG_TRACE, "pos:%"PRId64", len:%X\n", pos, len);
     224             : 
     225        5675 :             if (avio_feof(pb))
     226           0 :                 return AVERROR_INVALIDDATA;
     227             : 
     228        5675 :             if (last_pos == pos || pos == base - 8)
     229           2 :                 avi->non_interleaved = 1;
     230        5675 :             if (last_pos != pos && len)
     231        5457 :                 av_add_index_entry(st, pos, ast->cum_len, len, 0,
     232             :                                    key ? AVINDEX_KEYFRAME : 0);
     233             : 
     234        5675 :             ast->cum_len += get_duration(ast, len);
     235        5675 :             last_pos      = pos;
     236             :         } else {
     237             :             int64_t offset, pos;
     238             :             int duration;
     239          18 :             offset = avio_rl64(pb);
     240          18 :             avio_rl32(pb);       /* size */
     241          18 :             duration = avio_rl32(pb);
     242             : 
     243          18 :             if (avio_feof(pb))
     244           0 :                 return AVERROR_INVALIDDATA;
     245             : 
     246          18 :             pos = avio_tell(pb);
     247             : 
     248          18 :             if (avi->odml_depth > MAX_ODML_DEPTH) {
     249           0 :                 av_log(s, AV_LOG_ERROR, "Too deeply nested ODML indexes\n");
     250           0 :                 return AVERROR_INVALIDDATA;
     251             :             }
     252             : 
     253          18 :             if (avio_seek(pb, offset + 8, SEEK_SET) < 0)
     254           0 :                 return -1;
     255          18 :             avi->odml_depth++;
     256          18 :             read_odml_index(s, frame_num);
     257          18 :             avi->odml_depth--;
     258          18 :             frame_num += duration;
     259             : 
     260          18 :             if (avio_seek(pb, pos, SEEK_SET) < 0) {
     261           0 :                 av_log(s, AV_LOG_ERROR, "Failed to restore position after reading index\n");
     262           0 :                 return -1;
     263             :             }
     264             : 
     265             :         }
     266             :     }
     267          27 :     avi->index_loaded = 2;
     268          27 :     return 0;
     269             : }
     270             : 
     271           7 : static void clean_index(AVFormatContext *s)
     272             : {
     273             :     int i;
     274             :     int64_t j;
     275             : 
     276          19 :     for (i = 0; i < s->nb_streams; i++) {
     277          12 :         AVStream *st   = s->streams[i];
     278          12 :         AVIStream *ast = st->priv_data;
     279          12 :         int n          = st->nb_index_entries;
     280          12 :         int max        = ast->sample_size;
     281             :         int64_t pos, size, ts;
     282             : 
     283          12 :         if (n != 1 || ast->sample_size == 0)
     284          10 :             continue;
     285             : 
     286          22 :         while (max < 1024)
     287          18 :             max += max;
     288             : 
     289           2 :         pos  = st->index_entries[0].pos;
     290           2 :         size = st->index_entries[0].size;
     291           2 :         ts   = st->index_entries[0].timestamp;
     292             : 
     293          15 :         for (j = 0; j < size; j += max)
     294          13 :             av_add_index_entry(st, pos + j, ts + j, FFMIN(max, size - j), 0,
     295             :                                AVINDEX_KEYFRAME);
     296             :     }
     297           7 : }
     298             : 
     299          17 : static int avi_read_tag(AVFormatContext *s, AVStream *st, uint32_t tag,
     300             :                         uint32_t size)
     301             : {
     302          17 :     AVIOContext *pb = s->pb;
     303          17 :     char key[5]     = { 0 };
     304             :     char *value;
     305             : 
     306          17 :     size += (size & 1);
     307             : 
     308          17 :     if (size == UINT_MAX)
     309           0 :         return AVERROR(EINVAL);
     310          17 :     value = av_malloc(size + 1);
     311          17 :     if (!value)
     312           0 :         return AVERROR(ENOMEM);
     313          17 :     if (avio_read(pb, value, size) != size)
     314           0 :         return AVERROR_INVALIDDATA;
     315          17 :     value[size] = 0;
     316             : 
     317          17 :     AV_WL32(key, tag);
     318             : 
     319          17 :     return av_dict_set(st ? &st->metadata : &s->metadata, key, value,
     320             :                        AV_DICT_DONT_STRDUP_VAL);
     321             : }
     322             : 
     323             : static const char months[12][4] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
     324             :                                     "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
     325             : 
     326           1 : static void avi_metadata_creation_time(AVDictionary **metadata, char *date)
     327             : {
     328             :     char month[4], time[9], buffer[64];
     329             :     int i, day, year;
     330             :     /* parse standard AVI date format (ie. "Mon Mar 10 15:04:43 2003") */
     331           1 :     if (sscanf(date, "%*3s%*[ ]%3s%*[ ]%2d%*[ ]%8s%*[ ]%4d",
     332             :                month, &day, time, &year) == 4) {
     333          13 :         for (i = 0; i < 12; i++)
     334          12 :             if (!av_strcasecmp(month, months[i])) {
     335           1 :                 snprintf(buffer, sizeof(buffer), "%.4d-%.2d-%.2d %s",
     336             :                          year, i + 1, day, time);
     337           1 :                 av_dict_set(metadata, "creation_time", buffer, 0);
     338             :             }
     339           0 :     } else if (date[4] == '/' && date[7] == '/') {
     340           0 :         date[4] = date[7] = '-';
     341           0 :         av_dict_set(metadata, "creation_time", date, 0);
     342             :     }
     343           1 : }
     344             : 
     345           0 : static void avi_read_nikon(AVFormatContext *s, uint64_t end)
     346             : {
     347           0 :     while (avio_tell(s->pb) < end && !avio_feof(s->pb)) {
     348           0 :         uint32_t tag  = avio_rl32(s->pb);
     349           0 :         uint32_t size = avio_rl32(s->pb);
     350           0 :         switch (tag) {
     351             :         case MKTAG('n', 'c', 't', 'g'):  /* Nikon Tags */
     352             :         {
     353           0 :             uint64_t tag_end = avio_tell(s->pb) + size;
     354           0 :             while (avio_tell(s->pb) < tag_end && !avio_feof(s->pb)) {
     355           0 :                 uint16_t tag     = avio_rl16(s->pb);
     356           0 :                 uint16_t size    = avio_rl16(s->pb);
     357           0 :                 const char *name = NULL;
     358           0 :                 char buffer[64]  = { 0 };
     359           0 :                 size = FFMIN(size, tag_end - avio_tell(s->pb));
     360           0 :                 size -= avio_read(s->pb, buffer,
     361             :                                   FFMIN(size, sizeof(buffer) - 1));
     362           0 :                 switch (tag) {
     363             :                 case 0x03:
     364           0 :                     name = "maker";
     365           0 :                     break;
     366             :                 case 0x04:
     367           0 :                     name = "model";
     368           0 :                     break;
     369             :                 case 0x13:
     370           0 :                     name = "creation_time";
     371           0 :                     if (buffer[4] == ':' && buffer[7] == ':')
     372           0 :                         buffer[4] = buffer[7] = '-';
     373           0 :                     break;
     374             :                 }
     375           0 :                 if (name)
     376           0 :                     av_dict_set(&s->metadata, name, buffer, 0);
     377           0 :                 avio_skip(s->pb, size);
     378             :             }
     379           0 :             break;
     380             :         }
     381             :         default:
     382           0 :             avio_skip(s->pb, size);
     383           0 :             break;
     384             :         }
     385             :     }
     386           0 : }
     387             : 
     388           5 : static int avi_extract_stream_metadata(AVFormatContext *s, AVStream *st)
     389             : {
     390             :     GetByteContext gb;
     391           5 :     uint8_t *data = st->codecpar->extradata;
     392           5 :     int data_size = st->codecpar->extradata_size;
     393             :     int tag, offset;
     394             : 
     395           5 :     if (!data || data_size < 8) {
     396           0 :         return AVERROR_INVALIDDATA;
     397             :     }
     398             : 
     399           5 :     bytestream2_init(&gb, data, data_size);
     400             : 
     401           5 :     tag = bytestream2_get_le32(&gb);
     402             : 
     403           5 :     switch (tag) {
     404             :     case MKTAG('A', 'V', 'I', 'F'):
     405             :         // skip 4 byte padding
     406           0 :         bytestream2_skip(&gb, 4);
     407           0 :         offset = bytestream2_tell(&gb);
     408           0 :         bytestream2_init(&gb, data + offset, data_size - offset);
     409             : 
     410             :         // decode EXIF tags from IFD, AVI is always little-endian
     411           0 :         return avpriv_exif_decode_ifd(s, &gb, 1, 0, &st->metadata);
     412             :         break;
     413             :     case MKTAG('C', 'A', 'S', 'I'):
     414           0 :         avpriv_request_sample(s, "RIFF stream data tag type CASI (%u)", tag);
     415           0 :         break;
     416             :     case MKTAG('Z', 'o', 'r', 'a'):
     417           0 :         avpriv_request_sample(s, "RIFF stream data tag type Zora (%u)", tag);
     418           0 :         break;
     419             :     default:
     420           5 :         break;
     421             :     }
     422             : 
     423           5 :     return 0;
     424             : }
     425             : 
     426         394 : static int calculate_bitrate(AVFormatContext *s)
     427             : {
     428         394 :     AVIContext *avi = s->priv_data;
     429             :     int i, j;
     430         394 :     int64_t lensum = 0;
     431         394 :     int64_t maxpos = 0;
     432             : 
     433         827 :     for (i = 0; i<s->nb_streams; i++) {
     434         433 :         int64_t len = 0;
     435         433 :         AVStream *st = s->streams[i];
     436             : 
     437         433 :         if (!st->nb_index_entries)
     438          53 :             continue;
     439             : 
     440       28231 :         for (j = 0; j < st->nb_index_entries; j++)
     441       27851 :             len += st->index_entries[j].size;
     442         380 :         maxpos = FFMAX(maxpos, st->index_entries[j-1].pos);
     443         380 :         lensum += len;
     444             :     }
     445         394 :     if (maxpos < avi->io_fsize*9/10) // index does not cover the whole file
     446          81 :         return 0;
     447         313 :     if (lensum*9/10 > maxpos || lensum < maxpos*9/10) // frame sum and filesize mismatch
     448          21 :         return 0;
     449             : 
     450         603 :     for (i = 0; i<s->nb_streams; i++) {
     451         311 :         int64_t len = 0;
     452         311 :         AVStream *st = s->streams[i];
     453             :         int64_t duration;
     454             :         int64_t bitrate;
     455             : 
     456       25328 :         for (j = 0; j < st->nb_index_entries; j++)
     457       25017 :             len += st->index_entries[j].size;
     458             : 
     459         311 :         if (st->nb_index_entries < 2 || st->codecpar->bit_rate > 0)
     460          22 :             continue;
     461         289 :         duration = st->index_entries[j-1].timestamp - st->index_entries[0].timestamp;
     462         289 :         bitrate = av_rescale(8*len, st->time_base.den, duration * st->time_base.num);
     463         289 :         if (bitrate <= INT_MAX && bitrate > 0) {
     464         289 :             st->codecpar->bit_rate = bitrate;
     465             :         }
     466             :     }
     467         292 :     return 1;
     468             : }
     469             : 
     470         394 : static int avi_read_header(AVFormatContext *s)
     471             : {
     472         394 :     AVIContext *avi = s->priv_data;
     473         394 :     AVIOContext *pb = s->pb;
     474             :     unsigned int tag, tag1, handler;
     475             :     int codec_type, stream_index, frame_period;
     476             :     unsigned int size;
     477             :     int i;
     478             :     AVStream *st;
     479         394 :     AVIStream *ast      = NULL;
     480         394 :     int avih_width      = 0, avih_height = 0;
     481         394 :     int amv_file_format = 0;
     482         394 :     uint64_t list_end   = 0;
     483             :     int64_t pos;
     484             :     int ret;
     485             :     AVDictionaryEntry *dict_entry;
     486             : 
     487         394 :     avi->stream_index = -1;
     488             : 
     489         394 :     ret = get_riff(s, pb);
     490         394 :     if (ret < 0)
     491           0 :         return ret;
     492             : 
     493         394 :     av_log(avi, AV_LOG_DEBUG, "use odml:%d\n", avi->use_odml);
     494             : 
     495         394 :     avi->io_fsize = avi->fsize = avio_size(pb);
     496         394 :     if (avi->fsize <= 0 || avi->fsize < avi->riff_end)
     497          35 :         avi->fsize = avi->riff_end == 8 ? INT64_MAX : avi->riff_end;
     498             : 
     499             :     /* first list tag */
     500         394 :     stream_index = -1;
     501         394 :     codec_type   = -1;
     502         394 :     frame_period = 0;
     503             :     for (;;) {
     504        7294 :         if (avio_feof(pb))
     505           0 :             goto fail;
     506        3844 :         tag  = avio_rl32(pb);
     507        3844 :         size = avio_rl32(pb);
     508             : 
     509        3844 :         print_tag("tag", tag, size);
     510             : 
     511        3844 :         switch (tag) {
     512             :         case MKTAG('L', 'I', 'S', 'T'):
     513        1302 :             list_end = avio_tell(pb) + size;
     514             :             /* Ignored, except at start of video packets. */
     515        1302 :             tag1 = avio_rl32(pb);
     516             : 
     517        1302 :             print_tag("list", tag1, 0);
     518             : 
     519        1302 :             if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
     520         394 :                 avi->movi_list = avio_tell(pb) - 4;
     521         394 :                 if (size)
     522         392 :                     avi->movi_end = avi->movi_list + size + (size & 1);
     523             :                 else
     524           2 :                     avi->movi_end = avi->fsize;
     525         394 :                 av_log(NULL, AV_LOG_TRACE, "movi end=%"PRIx64"\n", avi->movi_end);
     526         394 :                 goto end_of_header;
     527         908 :             } else if (tag1 == MKTAG('I', 'N', 'F', 'O'))
     528          39 :                 ff_read_riff_info(s, size - 4);
     529         869 :             else if (tag1 == MKTAG('n', 'c', 'd', 't'))
     530           0 :                 avi_read_nikon(s, list_end);
     531             : 
     532         908 :             break;
     533             :         case MKTAG('I', 'D', 'I', 'T'):
     534             :         {
     535           1 :             unsigned char date[64] = { 0 };
     536           1 :             size += (size & 1);
     537           1 :             size -= avio_read(pb, date, FFMIN(size, sizeof(date) - 1));
     538           1 :             avio_skip(pb, size);
     539           1 :             avi_metadata_creation_time(&s->metadata, date);
     540           1 :             break;
     541             :         }
     542             :         case MKTAG('d', 'm', 'l', 'h'):
     543          38 :             avi->is_odml = 1;
     544          38 :             avio_skip(pb, size + (size & 1));
     545          38 :             break;
     546             :         case MKTAG('a', 'm', 'v', 'h'):
     547           2 :             amv_file_format = 1;
     548             :         case MKTAG('a', 'v', 'i', 'h'):
     549             :             /* AVI header */
     550             :             /* using frame_period is bad idea */
     551         394 :             frame_period = avio_rl32(pb);
     552         394 :             avio_rl32(pb); /* max. bytes per second */
     553         394 :             avio_rl32(pb);
     554         394 :             avi->non_interleaved |= avio_rl32(pb) & AVIF_MUSTUSEINDEX;
     555             : 
     556         394 :             avio_skip(pb, 2 * 4);
     557         394 :             avio_rl32(pb);
     558         394 :             avio_rl32(pb);
     559         394 :             avih_width  = avio_rl32(pb);
     560         394 :             avih_height = avio_rl32(pb);
     561             : 
     562         394 :             avio_skip(pb, size - 10 * 4);
     563         394 :             break;
     564             :         case MKTAG('s', 't', 'r', 'h'):
     565             :             /* stream header */
     566             : 
     567         434 :             tag1    = avio_rl32(pb);
     568         434 :             handler = avio_rl32(pb); /* codec tag */
     569             : 
     570         434 :             if (tag1 == MKTAG('p', 'a', 'd', 's')) {
     571           1 :                 avio_skip(pb, size - 8);
     572           1 :                 break;
     573             :             } else {
     574         433 :                 stream_index++;
     575         433 :                 st = avformat_new_stream(s, NULL);
     576         433 :                 if (!st)
     577           0 :                     goto fail;
     578             : 
     579         433 :                 st->id = stream_index;
     580         433 :                 ast    = av_mallocz(sizeof(AVIStream));
     581         433 :                 if (!ast)
     582           0 :                     goto fail;
     583         433 :                 st->priv_data = ast;
     584             :             }
     585         433 :             if (amv_file_format)
     586           4 :                 tag1 = stream_index ? MKTAG('a', 'u', 'd', 's')
     587           4 :                                     : MKTAG('v', 'i', 'd', 's');
     588             : 
     589         433 :             print_tag("strh", tag1, -1);
     590             : 
     591         433 :             if (tag1 == MKTAG('i', 'a', 'v', 's') ||
     592             :                 tag1 == MKTAG('i', 'v', 'a', 's')) {
     593             :                 int64_t dv_dur;
     594             : 
     595             :                 /* After some consideration -- I don't think we
     596             :                  * have to support anything but DV in type1 AVIs. */
     597           0 :                 if (s->nb_streams != 1)
     598           0 :                     goto fail;
     599             : 
     600           0 :                 if (handler != MKTAG('d', 'v', 's', 'd') &&
     601           0 :                     handler != MKTAG('d', 'v', 'h', 'd') &&
     602             :                     handler != MKTAG('d', 'v', 's', 'l'))
     603           0 :                     goto fail;
     604             : 
     605           0 :                 ast = s->streams[0]->priv_data;
     606           0 :                 av_freep(&s->streams[0]->codecpar->extradata);
     607           0 :                 av_freep(&s->streams[0]->codecpar);
     608             : #if FF_API_LAVF_AVCTX
     609             : FF_DISABLE_DEPRECATION_WARNINGS
     610           0 :                 av_freep(&s->streams[0]->codec);
     611             : FF_ENABLE_DEPRECATION_WARNINGS
     612             : #endif
     613           0 :                 if (s->streams[0]->info)
     614           0 :                     av_freep(&s->streams[0]->info->duration_error);
     615           0 :                 av_freep(&s->streams[0]->info);
     616           0 :                 if (s->streams[0]->internal)
     617           0 :                     av_freep(&s->streams[0]->internal->avctx);
     618           0 :                 av_freep(&s->streams[0]->internal);
     619           0 :                 av_freep(&s->streams[0]);
     620           0 :                 s->nb_streams = 0;
     621             :                 if (CONFIG_DV_DEMUXER) {
     622           0 :                     avi->dv_demux = avpriv_dv_init_demux(s);
     623           0 :                     if (!avi->dv_demux)
     624           0 :                         goto fail;
     625             :                 } else
     626             :                     goto fail;
     627           0 :                 s->streams[0]->priv_data = ast;
     628           0 :                 avio_skip(pb, 3 * 4);
     629           0 :                 ast->scale = avio_rl32(pb);
     630           0 :                 ast->rate  = avio_rl32(pb);
     631           0 :                 avio_skip(pb, 4);  /* start time */
     632             : 
     633           0 :                 dv_dur = avio_rl32(pb);
     634           0 :                 if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
     635           0 :                     dv_dur     *= AV_TIME_BASE;
     636           0 :                     s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
     637             :                 }
     638             :                 /* else, leave duration alone; timing estimation in utils.c
     639             :                  * will make a guess based on bitrate. */
     640             : 
     641           0 :                 stream_index = s->nb_streams - 1;
     642           0 :                 avio_skip(pb, size - 9 * 4);
     643           0 :                 break;
     644             :             }
     645             : 
     646         433 :             av_assert0(stream_index < s->nb_streams);
     647         433 :             ast->handler = handler;
     648             : 
     649         433 :             avio_rl32(pb); /* flags */
     650         433 :             avio_rl16(pb); /* priority */
     651         433 :             avio_rl16(pb); /* language */
     652         433 :             avio_rl32(pb); /* initial frame */
     653         433 :             ast->scale = avio_rl32(pb);
     654         433 :             ast->rate  = avio_rl32(pb);
     655         433 :             if (!(ast->scale && ast->rate)) {
     656           4 :                 av_log(s, AV_LOG_WARNING,
     657             :                        "scale/rate is %"PRIu32"/%"PRIu32" which is invalid. "
     658             :                        "(This file has been generated by broken software.)\n",
     659             :                        ast->scale,
     660             :                        ast->rate);
     661           4 :                 if (frame_period) {
     662           4 :                     ast->rate  = 1000000;
     663           4 :                     ast->scale = frame_period;
     664             :                 } else {
     665           0 :                     ast->rate  = 25;
     666           0 :                     ast->scale = 1;
     667             :                 }
     668             :             }
     669         433 :             avpriv_set_pts_info(st, 64, ast->scale, ast->rate);
     670             : 
     671         433 :             ast->cum_len  = avio_rl32(pb); /* start */
     672         433 :             st->nb_frames = avio_rl32(pb);
     673             : 
     674         433 :             st->start_time = 0;
     675         433 :             avio_rl32(pb); /* buffer size */
     676         433 :             avio_rl32(pb); /* quality */
     677         433 :             if (ast->cum_len*ast->scale/ast->rate > 3600) {
     678           0 :                 av_log(s, AV_LOG_ERROR, "crazy start time, iam scared, giving up\n");
     679           0 :                 ast->cum_len = 0;
     680             :             }
     681         433 :             ast->sample_size = avio_rl32(pb);
     682         433 :             ast->cum_len    *= FFMAX(1, ast->sample_size);
     683         433 :             av_log(s, AV_LOG_TRACE, "%"PRIu32" %"PRIu32" %d\n",
     684             :                     ast->rate, ast->scale, ast->sample_size);
     685             : 
     686         433 :             switch (tag1) {
     687             :             case MKTAG('v', 'i', 'd', 's'):
     688         391 :                 codec_type = AVMEDIA_TYPE_VIDEO;
     689             : 
     690         391 :                 ast->sample_size = 0;
     691         391 :                 st->avg_frame_rate = av_inv_q(st->time_base);
     692         391 :                 break;
     693             :             case MKTAG('a', 'u', 'd', 's'):
     694          42 :                 codec_type = AVMEDIA_TYPE_AUDIO;
     695          42 :                 break;
     696             :             case MKTAG('t', 'x', 't', 's'):
     697           0 :                 codec_type = AVMEDIA_TYPE_SUBTITLE;
     698           0 :                 break;
     699             :             case MKTAG('d', 'a', 't', 's'):
     700           0 :                 codec_type = AVMEDIA_TYPE_DATA;
     701           0 :                 break;
     702             :             default:
     703           0 :                 av_log(s, AV_LOG_INFO, "unknown stream type %X\n", tag1);
     704             :             }
     705             : 
     706         433 :             if (ast->sample_size < 0) {
     707           0 :                 if (s->error_recognition & AV_EF_EXPLODE) {
     708           0 :                     av_log(s, AV_LOG_ERROR,
     709             :                            "Invalid sample_size %d at stream %d\n",
     710             :                            ast->sample_size,
     711             :                            stream_index);
     712           0 :                     goto fail;
     713             :                 }
     714           0 :                 av_log(s, AV_LOG_WARNING,
     715             :                        "Invalid sample_size %d at stream %d "
     716             :                        "setting it to 0\n",
     717             :                        ast->sample_size,
     718             :                        stream_index);
     719           0 :                 ast->sample_size = 0;
     720             :             }
     721             : 
     722         433 :             if (ast->sample_size == 0) {
     723         400 :                 st->duration = st->nb_frames;
     724         400 :                 if (st->duration > 0 && avi->io_fsize > 0 && avi->riff_end > avi->io_fsize) {
     725          36 :                     av_log(s, AV_LOG_DEBUG, "File is truncated adjusting duration\n");
     726          36 :                     st->duration = av_rescale(st->duration, avi->io_fsize, avi->riff_end);
     727             :                 }
     728             :             }
     729         433 :             ast->frame_offset = ast->cum_len;
     730         433 :             avio_skip(pb, size - 12 * 4);
     731         433 :             break;
     732             :         case MKTAG('s', 't', 'r', 'f'):
     733             :             /* stream header */
     734         433 :             if (!size)
     735           0 :                 break;
     736         433 :             if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
     737           0 :                 avio_skip(pb, size);
     738             :             } else {
     739         433 :                 uint64_t cur_pos = avio_tell(pb);
     740             :                 unsigned esize;
     741         433 :                 if (cur_pos < list_end)
     742         429 :                     size = FFMIN(size, list_end - cur_pos);
     743         433 :                 st = s->streams[stream_index];
     744         433 :                 if (st->codecpar->codec_type != AVMEDIA_TYPE_UNKNOWN) {
     745           0 :                     avio_skip(pb, size);
     746           0 :                     break;
     747             :                 }
     748         433 :                 switch (codec_type) {
     749             :                 case AVMEDIA_TYPE_VIDEO:
     750         391 :                     if (amv_file_format) {
     751           2 :                         st->codecpar->width      = avih_width;
     752           2 :                         st->codecpar->height     = avih_height;
     753           2 :                         st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
     754           2 :                         st->codecpar->codec_id   = AV_CODEC_ID_AMV;
     755           2 :                         avio_skip(pb, size);
     756           2 :                         break;
     757             :                     }
     758         389 :                     tag1 = ff_get_bmp_header(pb, st, &esize);
     759             : 
     760         389 :                     if (tag1 == MKTAG('D', 'X', 'S', 'B') ||
     761             :                         tag1 == MKTAG('D', 'X', 'S', 'A')) {
     762           0 :                         st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
     763           0 :                         st->codecpar->codec_tag  = tag1;
     764           0 :                         st->codecpar->codec_id   = AV_CODEC_ID_XSUB;
     765           0 :                         break;
     766             :                     }
     767             : 
     768         389 :                     if (size > 10 * 4 && size < (1 << 30) && size < avi->fsize) {
     769         131 :                         if (esize == size-1 && (esize&1)) {
     770           9 :                             st->codecpar->extradata_size = esize - 10 * 4;
     771             :                         } else
     772         122 :                             st->codecpar->extradata_size =  size - 10 * 4;
     773         131 :                         if (st->codecpar->extradata) {
     774           0 :                             av_log(s, AV_LOG_WARNING, "New extradata in strf chunk, freeing previous one.\n");
     775           0 :                             av_freep(&st->codecpar->extradata);
     776             :                         }
     777         131 :                         if (ff_get_extradata(s, st->codecpar, pb, st->codecpar->extradata_size) < 0)
     778           0 :                             return AVERROR(ENOMEM);
     779             :                     }
     780             : 
     781             :                     // FIXME: check if the encoder really did this correctly
     782         389 :                     if (st->codecpar->extradata_size & 1)
     783           9 :                         avio_r8(pb);
     784             : 
     785             :                     /* Extract palette from extradata if bpp <= 8.
     786             :                      * This code assumes that extradata contains only palette.
     787             :                      * This is true for all paletted codecs implemented in
     788             :                      * FFmpeg. */
     789         520 :                     if (st->codecpar->extradata_size &&
     790         131 :                         (st->codecpar->bits_per_coded_sample <= 8)) {
     791          10 :                         int pal_size = (1 << st->codecpar->bits_per_coded_sample) << 2;
     792             :                         const uint8_t *pal_src;
     793             : 
     794          10 :                         pal_size = FFMIN(pal_size, st->codecpar->extradata_size);
     795          20 :                         pal_src  = st->codecpar->extradata +
     796          10 :                                    st->codecpar->extradata_size - pal_size;
     797             :                         /* Exclude the "BottomUp" field from the palette */
     798          10 :                         if (pal_src - st->codecpar->extradata >= 9 &&
     799           0 :                             !memcmp(st->codecpar->extradata + st->codecpar->extradata_size - 9, "BottomUp", 9))
     800           0 :                             pal_src -= 9;
     801        1060 :                         for (i = 0; i < pal_size / 4; i++)
     802        1050 :                             ast->pal[i] = 0xFFU<<24 | AV_RL32(pal_src+4*i);
     803          10 :                         ast->has_pal = 1;
     804             :                     }
     805             : 
     806         389 :                     print_tag("video", tag1, 0);
     807             : 
     808         389 :                     st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
     809         389 :                     st->codecpar->codec_tag  = tag1;
     810         389 :                     st->codecpar->codec_id   = ff_codec_get_id(ff_codec_bmp_tags,
     811             :                                                             tag1);
     812             :                     /* If codec is not found yet, try with the mov tags. */
     813         389 :                     if (!st->codecpar->codec_id) {
     814             :                         char tag_buf[32];
     815           0 :                         av_get_codec_tag_string(tag_buf, sizeof(tag_buf), tag1);
     816           0 :                         st->codecpar->codec_id =
     817           0 :                             ff_codec_get_id(ff_codec_movvideo_tags, tag1);
     818           0 :                         if (st->codecpar->codec_id)
     819           0 :                            av_log(s, AV_LOG_WARNING,
     820             :                                   "mov tag found in avi (fourcc %s)\n",
     821             :                                   tag_buf);
     822             :                     }
     823             :                     /* This is needed to get the pict type which is necessary
     824             :                      * for generating correct pts. */
     825         389 :                     st->need_parsing = AVSTREAM_PARSE_HEADERS;
     826             : 
     827         443 :                     if (st->codecpar->codec_id == AV_CODEC_ID_MPEG4 &&
     828          54 :                         ast->handler == MKTAG('X', 'V', 'I', 'D'))
     829           2 :                         st->codecpar->codec_tag = MKTAG('X', 'V', 'I', 'D');
     830             : 
     831         389 :                     if (st->codecpar->codec_tag == MKTAG('V', 'S', 'S', 'H'))
     832           0 :                         st->need_parsing = AVSTREAM_PARSE_FULL;
     833         389 :                     if (st->codecpar->codec_id == AV_CODEC_ID_RV40)
     834           0 :                         st->need_parsing = AVSTREAM_PARSE_NONE;
     835             : 
     836         389 :                     if (st->codecpar->codec_tag == 0 && st->codecpar->height > 0 &&
     837           0 :                         st->codecpar->extradata_size < 1U << 30) {
     838           0 :                         st->codecpar->extradata_size += 9;
     839           0 :                         if ((ret = av_reallocp(&st->codecpar->extradata,
     840           0 :                                                st->codecpar->extradata_size +
     841             :                                                AV_INPUT_BUFFER_PADDING_SIZE)) < 0) {
     842           0 :                             st->codecpar->extradata_size = 0;
     843           0 :                             return ret;
     844             :                         } else
     845           0 :                             memcpy(st->codecpar->extradata + st->codecpar->extradata_size - 9,
     846             :                                    "BottomUp", 9);
     847             :                     }
     848         389 :                     st->codecpar->height = FFABS(st->codecpar->height);
     849             : 
     850             : //                    avio_skip(pb, size - 5 * 4);
     851         389 :                     break;
     852             :                 case AVMEDIA_TYPE_AUDIO:
     853          42 :                     ret = ff_get_wav_header(s, pb, st->codecpar, size, 0);
     854          42 :                     if (ret < 0)
     855           0 :                         return ret;
     856          42 :                     ast->dshow_block_align = st->codecpar->block_align;
     857          75 :                     if (ast->sample_size && st->codecpar->block_align &&
     858          33 :                         ast->sample_size != st->codecpar->block_align) {
     859           0 :                         av_log(s,
     860             :                                AV_LOG_WARNING,
     861             :                                "sample size (%d) != block align (%d)\n",
     862             :                                ast->sample_size,
     863           0 :                                st->codecpar->block_align);
     864           0 :                         ast->sample_size = st->codecpar->block_align;
     865             :                     }
     866             :                     /* 2-aligned
     867             :                      * (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
     868          42 :                     if (size & 1)
     869           0 :                         avio_skip(pb, 1);
     870             :                     /* Force parsing as several audio frames can be in
     871             :                      * one packet and timestamps refer to packet start. */
     872          42 :                     st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
     873             :                     /* ADTS header is in extradata, AAC without header must be
     874             :                      * stored as exact frames. Parser not needed and it will
     875             :                      * fail. */
     876          42 :                     if (st->codecpar->codec_id == AV_CODEC_ID_AAC &&
     877           0 :                         st->codecpar->extradata_size)
     878           0 :                         st->need_parsing = AVSTREAM_PARSE_NONE;
     879             :                     // The flac parser does not work with AVSTREAM_PARSE_TIMESTAMPS
     880          42 :                     if (st->codecpar->codec_id == AV_CODEC_ID_FLAC)
     881           0 :                         st->need_parsing = AVSTREAM_PARSE_NONE;
     882             :                     /* AVI files with Xan DPCM audio (wrongly) declare PCM
     883             :                      * audio in the header but have Axan as stream_code_tag. */
     884          42 :                     if (ast->handler == AV_RL32("Axan")) {
     885           2 :                         st->codecpar->codec_id  = AV_CODEC_ID_XAN_DPCM;
     886           2 :                         st->codecpar->codec_tag = 0;
     887           2 :                         ast->dshow_block_align = 0;
     888             :                     }
     889          42 :                     if (amv_file_format) {
     890           2 :                         st->codecpar->codec_id    = AV_CODEC_ID_ADPCM_IMA_AMV;
     891           2 :                         ast->dshow_block_align = 0;
     892             :                     }
     893          84 :                     if ((st->codecpar->codec_id == AV_CODEC_ID_AAC  ||
     894          84 :                          st->codecpar->codec_id == AV_CODEC_ID_FLAC ||
     895          45 :                          st->codecpar->codec_id == AV_CODEC_ID_MP2 ) && ast->dshow_block_align <= 4 && ast->dshow_block_align) {
     896           0 :                         av_log(s, AV_LOG_DEBUG, "overriding invalid dshow_block_align of %d\n", ast->dshow_block_align);
     897           0 :                         ast->dshow_block_align = 0;
     898             :                     }
     899          84 :                     if (st->codecpar->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align == 1024 && ast->sample_size == 1024 ||
     900          84 :                        st->codecpar->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align == 4096 && ast->sample_size == 4096 ||
     901          44 :                        st->codecpar->codec_id == AV_CODEC_ID_MP3 && ast->dshow_block_align == 1152 && ast->sample_size == 1152) {
     902           0 :                         av_log(s, AV_LOG_DEBUG, "overriding sample_size\n");
     903           0 :                         ast->sample_size = 0;
     904             :                     }
     905          42 :                     break;
     906             :                 case AVMEDIA_TYPE_SUBTITLE:
     907           0 :                     st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
     908           0 :                     st->request_probe= 1;
     909           0 :                     avio_skip(pb, size);
     910           0 :                     break;
     911             :                 default:
     912           0 :                     st->codecpar->codec_type = AVMEDIA_TYPE_DATA;
     913           0 :                     st->codecpar->codec_id   = AV_CODEC_ID_NONE;
     914           0 :                     st->codecpar->codec_tag  = 0;
     915           0 :                     avio_skip(pb, size);
     916           0 :                     break;
     917             :                 }
     918             :             }
     919         433 :             break;
     920             :         case MKTAG('s', 't', 'r', 'd'):
     921           9 :             if (stream_index >= (unsigned)s->nb_streams
     922           9 :                 || s->streams[stream_index]->codecpar->extradata_size
     923           5 :                 || s->streams[stream_index]->codecpar->codec_tag == MKTAG('H','2','6','4')) {
     924           4 :                 avio_skip(pb, size);
     925             :             } else {
     926           5 :                 uint64_t cur_pos = avio_tell(pb);
     927           5 :                 if (cur_pos < list_end)
     928           5 :                     size = FFMIN(size, list_end - cur_pos);
     929           5 :                 st = s->streams[stream_index];
     930             : 
     931           5 :                 if (size<(1<<30)) {
     932           5 :                     if (st->codecpar->extradata) {
     933           0 :                         av_log(s, AV_LOG_WARNING, "New extradata in strd chunk, freeing previous one.\n");
     934           0 :                         av_freep(&st->codecpar->extradata);
     935             :                     }
     936           5 :                     if (ff_get_extradata(s, st->codecpar, pb, size) < 0)
     937           0 :                         return AVERROR(ENOMEM);
     938             :                 }
     939             : 
     940           5 :                 if (st->codecpar->extradata_size & 1) //FIXME check if the encoder really did this correctly
     941           0 :                     avio_r8(pb);
     942             : 
     943           5 :                 ret = avi_extract_stream_metadata(s, st);
     944           5 :                 if (ret < 0) {
     945           0 :                     av_log(s, AV_LOG_WARNING, "could not decoding EXIF data in stream header.\n");
     946             :                 }
     947             :             }
     948           9 :             break;
     949             :         case MKTAG('i', 'n', 'd', 'x'):
     950          18 :             pos = avio_tell(pb);
     951          36 :             if (pb->seekable && !(s->flags & AVFMT_FLAG_IGNIDX) &&
     952          36 :                 avi->use_odml &&
     953          18 :                 read_odml_index(s, 0) < 0 &&
     954           0 :                 (s->error_recognition & AV_EF_EXPLODE))
     955           0 :                 goto fail;
     956          18 :             avio_seek(pb, pos + size, SEEK_SET);
     957          18 :             break;
     958             :         case MKTAG('v', 'p', 'r', 'p'):
     959          10 :             if (stream_index < (unsigned)s->nb_streams && size > 9 * 4) {
     960             :                 AVRational active, active_aspect;
     961             : 
     962          10 :                 st = s->streams[stream_index];
     963          10 :                 avio_rl32(pb);
     964          10 :                 avio_rl32(pb);
     965          10 :                 avio_rl32(pb);
     966          10 :                 avio_rl32(pb);
     967          10 :                 avio_rl32(pb);
     968             : 
     969          10 :                 active_aspect.den = avio_rl16(pb);
     970          10 :                 active_aspect.num = avio_rl16(pb);
     971          10 :                 active.num        = avio_rl32(pb);
     972          10 :                 active.den        = avio_rl32(pb);
     973          10 :                 avio_rl32(pb); // nbFieldsPerFrame
     974             : 
     975          20 :                 if (active_aspect.num && active_aspect.den &&
     976          20 :                     active.num && active.den) {
     977          10 :                     st->sample_aspect_ratio = av_div_q(active_aspect, active);
     978          10 :                     av_log(s, AV_LOG_TRACE, "vprp %d/%d %d/%d\n",
     979             :                             active_aspect.num, active_aspect.den,
     980             :                             active.num, active.den);
     981             :                 }
     982          10 :                 size -= 9 * 4;
     983             :             }
     984          10 :             avio_skip(pb, size);
     985          10 :             break;
     986             :         case MKTAG('s', 't', 'r', 'n'):
     987          17 :             if (s->nb_streams) {
     988          17 :                 ret = avi_read_tag(s, s->streams[s->nb_streams - 1], tag, size);
     989          17 :                 if (ret < 0)
     990           0 :                     return ret;
     991          17 :                 break;
     992             :             }
     993             :         default:
     994        1188 :             if (size > 1000000) {
     995             :                 char tag_buf[32];
     996           0 :                 av_get_codec_tag_string(tag_buf, sizeof(tag_buf), tag);
     997           0 :                 av_log(s, AV_LOG_ERROR,
     998             :                        "Something went wrong during header parsing, "
     999             :                        "tag %s has size %u, "
    1000             :                        "I will ignore it and try to continue anyway.\n",
    1001             :                        tag_buf, size);
    1002           0 :                 if (s->error_recognition & AV_EF_EXPLODE)
    1003           0 :                     goto fail;
    1004           0 :                 avi->movi_list = avio_tell(pb) - 4;
    1005           0 :                 avi->movi_end  = avi->fsize;
    1006           0 :                 goto end_of_header;
    1007             :             }
    1008             :         /* Do not fail for very large idx1 tags */
    1009             :         case MKTAG('i', 'd', 'x', '1'):
    1010             :             /* skip tag */
    1011        1188 :             size += (size & 1);
    1012        1188 :             avio_skip(pb, size);
    1013        1188 :             break;
    1014             :         }
    1015             :     }
    1016             : 
    1017             : end_of_header:
    1018             :     /* check stream number */
    1019         394 :     if (stream_index != s->nb_streams - 1) {
    1020             : 
    1021             : fail:
    1022           0 :         return AVERROR_INVALIDDATA;
    1023             :     }
    1024             : 
    1025         394 :     if (!avi->index_loaded && pb->seekable)
    1026         384 :         avi_load_index(s);
    1027         394 :     calculate_bitrate(s);
    1028         394 :     avi->index_loaded    |= 1;
    1029             : 
    1030         394 :     if ((ret = guess_ni_flag(s)) < 0)
    1031           0 :         return ret;
    1032             : 
    1033         394 :     avi->non_interleaved |= ret | (s->flags & AVFMT_FLAG_SORT_DTS);
    1034             : 
    1035         394 :     dict_entry = av_dict_get(s->metadata, "ISFT", NULL, 0);
    1036         394 :     if (dict_entry && !strcmp(dict_entry->value, "PotEncoder"))
    1037           0 :         for (i = 0; i < s->nb_streams; i++) {
    1038           0 :             AVStream *st = s->streams[i];
    1039           0 :             if (   st->codecpar->codec_id == AV_CODEC_ID_MPEG1VIDEO
    1040           0 :                 || st->codecpar->codec_id == AV_CODEC_ID_MPEG2VIDEO)
    1041           0 :                 st->need_parsing = AVSTREAM_PARSE_FULL;
    1042             :         }
    1043             : 
    1044         446 :     for (i = 0; i < s->nb_streams; i++) {
    1045         411 :         AVStream *st = s->streams[i];
    1046         411 :         if (st->nb_index_entries)
    1047         359 :             break;
    1048             :     }
    1049             :     // DV-in-AVI cannot be non-interleaved, if set this must be
    1050             :     // a mis-detection.
    1051         394 :     if (avi->dv_demux)
    1052           0 :         avi->non_interleaved = 0;
    1053         394 :     if (i == s->nb_streams && avi->non_interleaved) {
    1054           1 :         av_log(s, AV_LOG_WARNING,
    1055             :                "Non-interleaved AVI without index, switching to interleaved\n");
    1056           1 :         avi->non_interleaved = 0;
    1057             :     }
    1058             : 
    1059         394 :     if (avi->non_interleaved) {
    1060           7 :         av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
    1061           7 :         clean_index(s);
    1062             :     }
    1063             : 
    1064         394 :     ff_metadata_conv_ctx(s, NULL, avi_metadata_conv);
    1065         394 :     ff_metadata_conv_ctx(s, NULL, ff_riff_info_conv);
    1066             : 
    1067         394 :     return 0;
    1068             : }
    1069             : 
    1070           0 : static int read_gab2_sub(AVFormatContext *s, AVStream *st, AVPacket *pkt)
    1071             : {
    1072           0 :     if (pkt->size >= 7 &&
    1073           0 :         pkt->size < INT_MAX - AVPROBE_PADDING_SIZE &&
    1074           0 :         !strcmp(pkt->data, "GAB2") && AV_RL16(pkt->data + 5) == 2) {
    1075             :         uint8_t desc[256];
    1076           0 :         int score      = AVPROBE_SCORE_EXTENSION, ret;
    1077           0 :         AVIStream *ast = st->priv_data;
    1078             :         AVInputFormat *sub_demuxer;
    1079             :         AVRational time_base;
    1080             :         int size;
    1081           0 :         AVIOContext *pb = avio_alloc_context(pkt->data + 7,
    1082           0 :                                              pkt->size - 7,
    1083             :                                              0, NULL, NULL, NULL, NULL);
    1084             :         AVProbeData pd;
    1085           0 :         unsigned int desc_len = avio_rl32(pb);
    1086             : 
    1087           0 :         if (desc_len > pb->buf_end - pb->buf_ptr)
    1088           0 :             goto error;
    1089             : 
    1090           0 :         ret = avio_get_str16le(pb, desc_len, desc, sizeof(desc));
    1091           0 :         avio_skip(pb, desc_len - ret);
    1092           0 :         if (*desc)
    1093           0 :             av_dict_set(&st->metadata, "title", desc, 0);
    1094             : 
    1095           0 :         avio_rl16(pb);   /* flags? */
    1096           0 :         avio_rl32(pb);   /* data size */
    1097             : 
    1098           0 :         size = pb->buf_end - pb->buf_ptr;
    1099           0 :         pd = (AVProbeData) { .buf      = av_mallocz(size + AVPROBE_PADDING_SIZE),
    1100             :                              .buf_size = size };
    1101           0 :         if (!pd.buf)
    1102           0 :             goto error;
    1103           0 :         memcpy(pd.buf, pb->buf_ptr, size);
    1104           0 :         sub_demuxer = av_probe_input_format2(&pd, 1, &score);
    1105           0 :         av_freep(&pd.buf);
    1106           0 :         if (!sub_demuxer)
    1107           0 :             goto error;
    1108             : 
    1109           0 :         if (!(ast->sub_ctx = avformat_alloc_context()))
    1110           0 :             goto error;
    1111             : 
    1112           0 :         ast->sub_ctx->pb = pb;
    1113             : 
    1114           0 :         if (ff_copy_whiteblacklists(ast->sub_ctx, s) < 0)
    1115           0 :             goto error;
    1116             : 
    1117           0 :         if (!avformat_open_input(&ast->sub_ctx, "", sub_demuxer, NULL)) {
    1118           0 :             if (ast->sub_ctx->nb_streams != 1)
    1119           0 :                 goto error;
    1120           0 :             ff_read_packet(ast->sub_ctx, &ast->sub_pkt);
    1121           0 :             avcodec_parameters_copy(st->codecpar, ast->sub_ctx->streams[0]->codecpar);
    1122           0 :             time_base = ast->sub_ctx->streams[0]->time_base;
    1123           0 :             avpriv_set_pts_info(st, 64, time_base.num, time_base.den);
    1124             :         }
    1125           0 :         ast->sub_buffer = pkt->data;
    1126           0 :         memset(pkt, 0, sizeof(*pkt));
    1127           0 :         return 1;
    1128             : 
    1129             : error:
    1130           0 :         av_freep(&ast->sub_ctx);
    1131           0 :         av_freep(&pb);
    1132             :     }
    1133           0 :     return 0;
    1134             : }
    1135             : 
    1136       23344 : static AVStream *get_subtitle_pkt(AVFormatContext *s, AVStream *next_st,
    1137             :                                   AVPacket *pkt)
    1138             : {
    1139       23344 :     AVIStream *ast, *next_ast = next_st->priv_data;
    1140       23344 :     int64_t ts, next_ts, ts_min = INT64_MAX;
    1141       23344 :     AVStream *st, *sub_st = NULL;
    1142             :     int i;
    1143             : 
    1144       23344 :     next_ts = av_rescale_q(next_ast->frame_offset, next_st->time_base,
    1145       23344 :                            AV_TIME_BASE_Q);
    1146             : 
    1147       52260 :     for (i = 0; i < s->nb_streams; i++) {
    1148       28916 :         st  = s->streams[i];
    1149       28916 :         ast = st->priv_data;
    1150       28916 :         if (st->discard < AVDISCARD_ALL && ast && ast->sub_pkt.data) {
    1151           0 :             ts = av_rescale_q(ast->sub_pkt.dts, st->time_base, AV_TIME_BASE_Q);
    1152           0 :             if (ts <= next_ts && ts < ts_min) {
    1153           0 :                 ts_min = ts;
    1154           0 :                 sub_st = st;
    1155             :             }
    1156             :         }
    1157             :     }
    1158             : 
    1159       23344 :     if (sub_st) {
    1160           0 :         ast               = sub_st->priv_data;
    1161           0 :         *pkt              = ast->sub_pkt;
    1162           0 :         pkt->stream_index = sub_st->index;
    1163             : 
    1164           0 :         if (ff_read_packet(ast->sub_ctx, &ast->sub_pkt) < 0)
    1165           0 :             ast->sub_pkt.data = NULL;
    1166             :     }
    1167       23344 :     return sub_st;
    1168             : }
    1169             : 
    1170      471606 : static int get_stream_idx(const unsigned *d)
    1171             : {
    1172      551726 :     if (d[0] >= '0' && d[0] <= '9' &&
    1173      159882 :         d[1] >= '0' && d[1] <= '9') {
    1174       53732 :         return (d[0] - '0') * 10 + (d[1] - '0');
    1175             :     } else {
    1176      417874 :         return 100; // invalid stream ID
    1177             :     }
    1178             : }
    1179             : 
    1180             : /**
    1181             :  *
    1182             :  * @param exit_early set to 1 to just gather packet position without making the changes needed to actually read & return the packet
    1183             :  */
    1184       23301 : static int avi_sync(AVFormatContext *s, int exit_early)
    1185             : {
    1186       23301 :     AVIContext *avi = s->priv_data;
    1187       23301 :     AVIOContext *pb = s->pb;
    1188             :     int n;
    1189             :     unsigned int d[8];
    1190             :     unsigned int size;
    1191             :     int64_t i, sync;
    1192             : 
    1193             : start_sync:
    1194       27445 :     memset(d, -1, sizeof(d));
    1195      324531 :     for (i = sync = avio_tell(pb); !avio_feof(pb); i++) {
    1196             :         int j;
    1197             : 
    1198     2592784 :         for (j = 0; j < 7; j++)
    1199     2268686 :             d[j] = d[j + 1];
    1200      324098 :         d[7] = avio_r8(pb);
    1201             : 
    1202      324098 :         size = d[4] + (d[5] << 8) + (d[6] << 16) + (d[7] << 24);
    1203             : 
    1204      324098 :         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      324098 :         if (i*(avi->io_fsize>0) + (uint64_t)size > avi->fsize || d[0] > 127)
    1208      216789 :             continue;
    1209             : 
    1210             :         // parse ix##
    1211      214617 :         if ((d[0] == 'i' && d[1] == 'x' && n < s->nb_streams) ||
    1212             :             // parse JUNK
    1213      214617 :             (d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K') ||
    1214      213683 :             (d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1') ||
    1215      106441 :             (d[0] == 'i' && d[1] == 'n' && d[2] == 'd' && d[3] == 'x')) {
    1216         869 :             avio_skip(pb, size);
    1217         869 :             goto start_sync;
    1218             :         }
    1219             : 
    1220             :         // parse stray LIST
    1221      106440 :         if (d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T') {
    1222         643 :             avio_skip(pb, 4);
    1223         643 :             goto start_sync;
    1224             :         }
    1225             : 
    1226      105797 :         n = get_stream_idx(d);
    1227             : 
    1228      146792 :         if (!((i - avi->last_pkt_pos) & 1) &&
    1229       40995 :             get_stream_idx(d + 1) < s->nb_streams)
    1230         734 :             continue;
    1231             : 
    1232             :         // detect ##ix chunk and skip
    1233      105063 :         if (d[2] == 'i' && d[3] == 'x' && n < s->nb_streams) {
    1234           0 :             avio_skip(pb, size);
    1235           0 :             goto start_sync;
    1236             :         }
    1237             : 
    1238      105063 :         if (avi->dv_demux && n != 0)
    1239           0 :             continue;
    1240             : 
    1241             :         // parse ##dc/##wb
    1242      105063 :         if (n < s->nb_streams) {
    1243             :             AVStream *st;
    1244             :             AVIStream *ast;
    1245       25500 :             st  = s->streams[n];
    1246       25500 :             ast = st->priv_data;
    1247             : 
    1248       25500 :             if (!ast) {
    1249           0 :                 av_log(s, AV_LOG_WARNING, "Skipping foreign stream %d packet\n", n);
    1250           0 :                 continue;
    1251             :             }
    1252             : 
    1253       25500 :             if (s->nb_streams >= 2) {
    1254        7655 :                 AVStream *st1   = s->streams[1];
    1255        7655 :                 AVIStream *ast1 = st1->priv_data;
    1256             :                 // workaround for broken small-file-bug402.avi
    1257        7655 :                 if (   d[2] == 'w' && d[3] == 'b'
    1258        2836 :                    && n == 0
    1259         314 :                    && st ->codecpar->codec_type == AVMEDIA_TYPE_VIDEO
    1260           0 :                    && st1->codecpar->codec_type == AVMEDIA_TYPE_AUDIO
    1261           0 :                    && ast->prefix == 'd'*256+'c'
    1262           0 :                    && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
    1263             :                   ) {
    1264           0 :                     n   = 1;
    1265           0 :                     st  = st1;
    1266           0 :                     ast = ast1;
    1267           0 :                     av_log(s, AV_LOG_WARNING,
    1268             :                            "Invalid stream + prefix combination, assuming audio.\n");
    1269             :                 }
    1270             :             }
    1271             : 
    1272       51000 :             if (!avi->dv_demux &&
    1273       29826 :                 ((st->discard >= AVDISCARD_DEFAULT && size == 0) /* ||
    1274             :                  // FIXME: needs a little reordering
    1275             :                  (st->discard >= AVDISCARD_NONKEY &&
    1276             :                  !(pkt->flags & AV_PKT_FLAG_KEY)) */
    1277       25227 :                 || st->discard >= AVDISCARD_ALL)) {
    1278        2628 :                 if (!exit_early) {
    1279        2628 :                     ast->frame_offset += get_duration(ast, size);
    1280        2628 :                     avio_skip(pb, size);
    1281        2628 :                     goto start_sync;
    1282             :                 }
    1283             :             }
    1284             : 
    1285       22872 :             if (d[2] == 'p' && d[3] == 'c' && size <= 4 * 256 + 4) {
    1286           4 :                 int k    = avio_r8(pb);
    1287           4 :                 int last = (k + avio_r8(pb) - 1) & 0xFF;
    1288             : 
    1289           4 :                 avio_rl16(pb); // flags
    1290             : 
    1291             :                 // b + (g << 8) + (r << 16);
    1292         763 :                 for (; k <= last; k++)
    1293         759 :                     ast->pal[k] = 0xFFU<<24 | avio_rb32(pb)>>8;
    1294             : 
    1295           4 :                 ast->has_pal = 1;
    1296           4 :                 goto start_sync;
    1297       45736 :             } else if (((ast->prefix_count < 5 || sync + 9 > i) &&
    1298       45736 :                         d[2] < 128 && d[3] < 128) ||
    1299           0 :                        d[2] * 256 + d[3] == ast->prefix /* ||
    1300             :                        (d[2] == 'd' && d[3] == 'c') ||
    1301             :                        (d[2] == 'w' && d[3] == 'b') */) {
    1302       22868 :                 if (exit_early)
    1303         353 :                     return 0;
    1304       22515 :                 if (d[2] * 256 + d[3] == ast->prefix)
    1305       22026 :                     ast->prefix_count++;
    1306             :                 else {
    1307         489 :                     ast->prefix       = d[2] * 256 + d[3];
    1308         489 :                     ast->prefix_count = 0;
    1309             :                 }
    1310             : 
    1311       22515 :                 avi->stream_index = n;
    1312       22515 :                 ast->packet_size  = size + 8;
    1313       22515 :                 ast->remaining    = size;
    1314             : 
    1315       22515 :                 if (size) {
    1316       21003 :                     uint64_t pos = avio_tell(pb) - 8;
    1317       41955 :                     if (!st->index_entries || !st->nb_index_entries ||
    1318       20952 :                         st->index_entries[st->nb_index_entries - 1].pos < pos) {
    1319        2205 :                         av_add_index_entry(st, pos, ast->frame_offset, size,
    1320             :                                            0, AVINDEX_KEYFRAME);
    1321             :                     }
    1322             :                 }
    1323       22515 :                 return 0;
    1324             :             }
    1325             :         }
    1326             :     }
    1327             : 
    1328         433 :     if (pb->error)
    1329           0 :         return pb->error;
    1330         433 :     return AVERROR_EOF;
    1331             : }
    1332             : 
    1333         766 : static int ni_prepare_read(AVFormatContext *s)
    1334             : {
    1335         766 :     AVIContext *avi = s->priv_data;
    1336         766 :     int best_stream_index = 0;
    1337         766 :     AVStream *best_st     = NULL;
    1338             :     AVIStream *best_ast;
    1339         766 :     int64_t best_ts = INT64_MAX;
    1340             :     int i;
    1341             : 
    1342        2054 :     for (i = 0; i < s->nb_streams; i++) {
    1343        1288 :         AVStream *st   = s->streams[i];
    1344        1288 :         AVIStream *ast = st->priv_data;
    1345        1288 :         int64_t ts     = ast->frame_offset;
    1346             :         int64_t last_ts;
    1347             : 
    1348        1288 :         if (!st->nb_index_entries)
    1349           0 :             continue;
    1350             : 
    1351        1288 :         last_ts = st->index_entries[st->nb_index_entries - 1].timestamp;
    1352        1288 :         if (!ast->remaining && ts > last_ts)
    1353          16 :             continue;
    1354             : 
    1355        1272 :         ts = av_rescale_q(ts, st->time_base,
    1356        1272 :                           (AVRational) { FFMAX(1, ast->sample_size),
    1357             :                                          AV_TIME_BASE });
    1358             : 
    1359        1272 :         av_log(s, AV_LOG_TRACE, "%"PRId64" %d/%d %"PRId64"\n", ts,
    1360             :                 st->time_base.num, st->time_base.den, ast->frame_offset);
    1361        1272 :         if (ts < best_ts) {
    1362         975 :             best_ts           = ts;
    1363         975 :             best_st           = st;
    1364         975 :             best_stream_index = i;
    1365             :         }
    1366             :     }
    1367         766 :     if (!best_st)
    1368           5 :         return AVERROR_EOF;
    1369             : 
    1370         761 :     best_ast = best_st->priv_data;
    1371         761 :     best_ts  = best_ast->frame_offset;
    1372         761 :     if (best_ast->remaining) {
    1373         181 :         i = av_index_search_timestamp(best_st,
    1374             :                                       best_ts,
    1375             :                                       AVSEEK_FLAG_ANY |
    1376             :                                       AVSEEK_FLAG_BACKWARD);
    1377             :     } else {
    1378         580 :         i = av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
    1379         580 :         if (i >= 0)
    1380         580 :             best_ast->frame_offset = best_st->index_entries[i].timestamp;
    1381             :     }
    1382             : 
    1383         761 :     if (i >= 0) {
    1384         761 :         int64_t pos = best_st->index_entries[i].pos;
    1385         761 :         pos += best_ast->packet_size - best_ast->remaining;
    1386         761 :         if (avio_seek(s->pb, pos + 8, SEEK_SET) < 0)
    1387           0 :           return AVERROR_EOF;
    1388             : 
    1389         761 :         av_assert0(best_ast->remaining <= best_ast->packet_size);
    1390             : 
    1391         761 :         avi->stream_index = best_stream_index;
    1392         761 :         if (!best_ast->remaining)
    1393         580 :             best_ast->packet_size =
    1394         580 :             best_ast->remaining   = best_st->index_entries[i].size;
    1395             :     }
    1396             :     else
    1397           0 :         return AVERROR_EOF;
    1398             : 
    1399         761 :     return 0;
    1400             : }
    1401             : 
    1402       23781 : static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
    1403             : {
    1404       23781 :     AVIContext *avi = s->priv_data;
    1405       23781 :     AVIOContext *pb = s->pb;
    1406             :     int err;
    1407             : 
    1408       23781 :     if (CONFIG_DV_DEMUXER && avi->dv_demux) {
    1409           0 :         int size = avpriv_dv_get_packet(avi->dv_demux, pkt);
    1410           0 :         if (size >= 0)
    1411           0 :             return size;
    1412             :         else
    1413           0 :             goto resync;
    1414             :     }
    1415             : 
    1416       23781 :     if (avi->non_interleaved) {
    1417         766 :         err = ni_prepare_read(s);
    1418         766 :         if (err < 0)
    1419           5 :             return err;
    1420             :     }
    1421             : 
    1422             : resync:
    1423       46292 :     if (avi->stream_index >= 0) {
    1424       23344 :         AVStream *st   = s->streams[avi->stream_index];
    1425       23344 :         AVIStream *ast = st->priv_data;
    1426             :         int size, err;
    1427             : 
    1428       23344 :         if (get_subtitle_pkt(s, st, pkt))
    1429           0 :             return 0;
    1430             : 
    1431             :         // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
    1432       23344 :         if (ast->sample_size <= 1)
    1433       20476 :             size = INT_MAX;
    1434        2868 :         else if (ast->sample_size < 32)
    1435             :             // arbitrary multiplier to avoid tiny packets for raw PCM data
    1436         238 :             size = 1024 * ast->sample_size;
    1437             :         else
    1438        2630 :             size = ast->sample_size;
    1439             : 
    1440       23344 :         if (size > ast->remaining)
    1441       20487 :             size = ast->remaining;
    1442       23344 :         avi->last_pkt_pos = avio_tell(pb);
    1443       23344 :         err               = av_get_packet(pb, pkt, size);
    1444       23344 :         if (err < 0)
    1445          35 :             return err;
    1446       23309 :         size = err;
    1447             : 
    1448       23309 :         if (ast->has_pal && pkt->size < (unsigned)INT_MAX / 2) {
    1449             :             uint8_t *pal;
    1450          14 :             pal = av_packet_new_side_data(pkt,
    1451             :                                           AV_PKT_DATA_PALETTE,
    1452             :                                           AVPALETTE_SIZE);
    1453          14 :             if (!pal) {
    1454           0 :                 av_log(s, AV_LOG_ERROR,
    1455             :                        "Failed to allocate data for palette\n");
    1456             :             } else {
    1457          14 :                 memcpy(pal, ast->pal, AVPALETTE_SIZE);
    1458          14 :                 ast->has_pal = 0;
    1459             :             }
    1460             :         }
    1461             : 
    1462       23309 :         if (CONFIG_DV_DEMUXER && avi->dv_demux) {
    1463           0 :             AVBufferRef *avbuf = pkt->buf;
    1464           0 :             size = avpriv_dv_produce_packet(avi->dv_demux, pkt,
    1465             :                                             pkt->data, pkt->size, pkt->pos);
    1466           0 :             pkt->buf    = avbuf;
    1467           0 :             pkt->flags |= AV_PKT_FLAG_KEY;
    1468           0 :             if (size < 0)
    1469           0 :                 av_packet_unref(pkt);
    1470       23309 :         } else if (st->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE &&
    1471           0 :                    !st->codecpar->codec_tag && read_gab2_sub(s, st, pkt)) {
    1472           0 :             ast->frame_offset++;
    1473           0 :             avi->stream_index = -1;
    1474           0 :             ast->remaining    = 0;
    1475           0 :             goto resync;
    1476             :         } else {
    1477             :             /* XXX: How to handle B-frames in AVI? */
    1478       23309 :             pkt->dts = ast->frame_offset;
    1479             : //                pkt->dts += ast->start;
    1480       23309 :             if (ast->sample_size)
    1481        3226 :                 pkt->dts /= ast->sample_size;
    1482       23309 :             av_log(s, AV_LOG_TRACE,
    1483             :                     "dts:%"PRId64" offset:%"PRId64" %d/%d smpl_siz:%d "
    1484             :                     "base:%d st:%d size:%d\n",
    1485             :                     pkt->dts,
    1486             :                     ast->frame_offset,
    1487             :                     ast->scale,
    1488             :                     ast->rate,
    1489             :                     ast->sample_size,
    1490             :                     AV_TIME_BASE,
    1491             :                     avi->stream_index,
    1492             :                     size);
    1493       23309 :             pkt->stream_index = avi->stream_index;
    1494             : 
    1495       42995 :             if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && st->index_entries) {
    1496             :                 AVIndexEntry *e;
    1497             :                 int index;
    1498             : 
    1499       19686 :                 index = av_index_search_timestamp(st, ast->frame_offset, AVSEEK_FLAG_ANY);
    1500       19686 :                 e     = &st->index_entries[index];
    1501             : 
    1502       19686 :                 if (index >= 0 && e->timestamp == ast->frame_offset) {
    1503       18173 :                     if (index == st->nb_index_entries-1) {
    1504        2108 :                         int key=1;
    1505        2108 :                         uint32_t state=-1;
    1506        2108 :                         if (st->codecpar->codec_id == AV_CODEC_ID_MPEG4) {
    1507          52 :                             const uint8_t *ptr = pkt->data, *end = ptr + FFMIN(size, 256);
    1508         161 :                             while (ptr < end) {
    1509         109 :                                 ptr = avpriv_find_start_code(ptr, end, &state);
    1510         109 :                                 if (state == 0x1B6 && ptr < end) {
    1511          52 :                                     key = !(*ptr & 0xC0);
    1512          52 :                                     break;
    1513             :                                 }
    1514             :                             }
    1515             :                         }
    1516        2108 :                         if (!key)
    1517          39 :                             e->flags &= ~AVINDEX_KEYFRAME;
    1518             :                     }
    1519       18173 :                     if (e->flags & AVINDEX_KEYFRAME)
    1520       10608 :                         pkt->flags |= AV_PKT_FLAG_KEY;
    1521             :                 }
    1522             :             } else {
    1523        3623 :                 pkt->flags |= AV_PKT_FLAG_KEY;
    1524             :             }
    1525       23309 :             ast->frame_offset += get_duration(ast, pkt->size);
    1526             :         }
    1527       23309 :         ast->remaining -= err;
    1528       23309 :         if (!ast->remaining) {
    1529       23063 :             avi->stream_index = -1;
    1530       23063 :             ast->packet_size  = 0;
    1531             :         }
    1532             : 
    1533       23309 :         if (!avi->non_interleaved && pkt->pos >= 0 && ast->seek_pos > pkt->pos) {
    1534           1 :             av_packet_unref(pkt);
    1535           1 :             goto resync;
    1536             :         }
    1537       23308 :         ast->seek_pos= 0;
    1538             : 
    1539       23308 :         if (!avi->non_interleaved && st->nb_index_entries>1 && avi->index_loaded>1) {
    1540       20799 :             int64_t dts= av_rescale_q(pkt->dts, st->time_base, AV_TIME_BASE_Q);
    1541             : 
    1542       20799 :             if (avi->dts_max - dts > 2*AV_TIME_BASE) {
    1543           0 :                 avi->non_interleaved= 1;
    1544           0 :                 av_log(s, AV_LOG_INFO, "Switching to NI mode, due to poor interleaving\n");
    1545       20799 :             }else if (avi->dts_max < dts)
    1546       20172 :                 avi->dts_max = dts;
    1547             :         }
    1548             : 
    1549       23308 :         return 0;
    1550             :     }
    1551             : 
    1552       22948 :     if ((err = avi_sync(s, 0)) < 0)
    1553         433 :         return err;
    1554       22515 :     goto resync;
    1555             : }
    1556             : 
    1557             : /* XXX: We make the implicit supposition that the positions are sorted
    1558             :  * for each stream. */
    1559         353 : static int avi_read_idx1(AVFormatContext *s, int size)
    1560             : {
    1561         353 :     AVIContext *avi = s->priv_data;
    1562         353 :     AVIOContext *pb = s->pb;
    1563             :     int nb_index_entries, i;
    1564             :     AVStream *st;
    1565             :     AVIStream *ast;
    1566             :     int64_t pos;
    1567         353 :     unsigned int index, tag, flags, len, first_packet = 1;
    1568         353 :     int64_t last_pos = -1;
    1569         353 :     unsigned last_idx = -1;
    1570         353 :     int64_t idx1_pos, first_packet_pos = 0, data_offset = 0;
    1571         353 :     int anykey = 0;
    1572             : 
    1573         353 :     nb_index_entries = size / 16;
    1574         353 :     if (nb_index_entries <= 0)
    1575           0 :         return AVERROR_INVALIDDATA;
    1576             : 
    1577         353 :     idx1_pos = avio_tell(pb);
    1578         353 :     avio_seek(pb, avi->movi_list + 4, SEEK_SET);
    1579         353 :     if (avi_sync(s, 1) == 0)
    1580         353 :         first_packet_pos = avio_tell(pb) - 8;
    1581         353 :     avi->stream_index = -1;
    1582         353 :     avio_seek(pb, idx1_pos, SEEK_SET);
    1583             : 
    1584         353 :     if (s->nb_streams == 1 && s->streams[0]->codecpar->codec_tag == AV_RL32("MMES")) {
    1585           0 :         first_packet_pos = 0;
    1586           0 :         data_offset = avi->movi_list;
    1587             :     }
    1588             : 
    1589             :     /* Read the entries and sort them in each stream component. */
    1590       24804 :     for (i = 0; i < nb_index_entries; i++) {
    1591       24451 :         if (avio_feof(pb))
    1592           0 :             return -1;
    1593             : 
    1594       24451 :         tag   = avio_rl32(pb);
    1595       24451 :         flags = avio_rl32(pb);
    1596       24451 :         pos   = avio_rl32(pb);
    1597       24451 :         len   = avio_rl32(pb);
    1598       24451 :         av_log(s, AV_LOG_TRACE, "%d: tag=0x%x flags=0x%x pos=0x%"PRIx64" len=%d/",
    1599             :                 i, tag, flags, pos, len);
    1600             : 
    1601       24451 :         index  = ((tag      & 0xff) - '0') * 10;
    1602       24451 :         index +=  (tag >> 8 & 0xff) - '0';
    1603       24451 :         if (index >= s->nb_streams)
    1604         290 :             continue;
    1605       24161 :         st  = s->streams[index];
    1606       24161 :         ast = st->priv_data;
    1607             : 
    1608             :         /* Skip 'xxpc' palette change entries in the index until a logic
    1609             :          * to process these is properly implemented. */
    1610       24161 :         if ((tag >> 16 & 0xff) == 'p' && (tag >> 24 & 0xff) == 'c')
    1611           2 :             continue;
    1612             : 
    1613       24159 :         if (first_packet && first_packet_pos) {
    1614         353 :             if (avi->movi_list + 4 != pos || pos + 500 > first_packet_pos)
    1615         353 :                 data_offset  = first_packet_pos - pos;
    1616         353 :             first_packet = 0;
    1617             :         }
    1618       24159 :         pos += data_offset;
    1619             : 
    1620       24159 :         av_log(s, AV_LOG_TRACE, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
    1621             : 
    1622             :         // even if we have only a single stream, we should
    1623             :         // switch to non-interleaved to get correct timestamps
    1624       24159 :         if (last_pos == pos)
    1625           0 :             avi->non_interleaved = 1;
    1626       24159 :         if (last_idx != pos && len) {
    1627       22394 :             av_add_index_entry(st, pos, ast->cum_len, len, 0,
    1628       22394 :                                (flags & AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
    1629       22394 :             last_idx= pos;
    1630             :         }
    1631       24159 :         ast->cum_len += get_duration(ast, len);
    1632       24159 :         last_pos      = pos;
    1633       24159 :         anykey       |= flags&AVIIF_INDEX;
    1634             :     }
    1635         353 :     if (!anykey) {
    1636           2 :         for (index = 0; index < s->nb_streams; index++) {
    1637           1 :             st = s->streams[index];
    1638           1 :             if (st->nb_index_entries)
    1639           1 :                 st->index_entries[0].flags |= AVINDEX_KEYFRAME;
    1640             :         }
    1641             :     }
    1642         353 :     return 0;
    1643             : }
    1644             : 
    1645             : /* Scan the index and consider any file with streams more than
    1646             :  * 2 seconds or 64MB apart non-interleaved. */
    1647         389 : static int check_stream_max_drift(AVFormatContext *s)
    1648             : {
    1649             :     int64_t min_pos, pos;
    1650             :     int i;
    1651         389 :     int *idx = av_mallocz_array(s->nb_streams, sizeof(*idx));
    1652         389 :     if (!idx)
    1653           0 :         return AVERROR(ENOMEM);
    1654       28242 :     for (min_pos = pos = 0; min_pos != INT64_MAX; pos = min_pos + 1LU) {
    1655       27853 :         int64_t max_dts = INT64_MIN / 2;
    1656       27853 :         int64_t min_dts = INT64_MAX / 2;
    1657       27853 :         int64_t max_buffer = 0;
    1658             : 
    1659       27853 :         min_pos = INT64_MAX;
    1660             : 
    1661       63963 :         for (i = 0; i < s->nb_streams; i++) {
    1662       36110 :             AVStream *st = s->streams[i];
    1663       36110 :             AVIStream *ast = st->priv_data;
    1664       36110 :             int n = st->nb_index_entries;
    1665       99684 :             while (idx[i] < n && st->index_entries[idx[i]].pos < pos)
    1666       27464 :                 idx[i]++;
    1667       36110 :             if (idx[i] < n) {
    1668             :                 int64_t dts;
    1669       70900 :                 dts = av_rescale_q(st->index_entries[idx[i]].timestamp /
    1670       35450 :                                    FFMAX(ast->sample_size, 1),
    1671       35450 :                                    st->time_base, AV_TIME_BASE_Q);
    1672       35450 :                 min_dts = FFMIN(min_dts, dts);
    1673       35450 :                 min_pos = FFMIN(min_pos, st->index_entries[idx[i]].pos);
    1674             :             }
    1675             :         }
    1676       63963 :         for (i = 0; i < s->nb_streams; i++) {
    1677       36110 :             AVStream *st = s->streams[i];
    1678       36110 :             AVIStream *ast = st->priv_data;
    1679             : 
    1680       36110 :             if (idx[i] && min_dts != INT64_MAX / 2) {
    1681             :                 int64_t dts;
    1682       70242 :                 dts = av_rescale_q(st->index_entries[idx[i] - 1].timestamp /
    1683       35121 :                                    FFMAX(ast->sample_size, 1),
    1684       35121 :                                    st->time_base, AV_TIME_BASE_Q);
    1685       35121 :                 max_dts = FFMAX(max_dts, dts);
    1686       35121 :                 max_buffer = FFMAX(max_buffer,
    1687             :                                    av_rescale(dts - min_dts,
    1688             :                                               st->codecpar->bit_rate,
    1689             :                                               AV_TIME_BASE));
    1690             :             }
    1691             :         }
    1692       27853 :         if (max_dts - min_dts > 2 * AV_TIME_BASE ||
    1693             :             max_buffer > 1024 * 1024 * 8 * 8) {
    1694           0 :             av_free(idx);
    1695           0 :             return 1;
    1696             :         }
    1697             :     }
    1698         389 :     av_free(idx);
    1699         389 :     return 0;
    1700             : }
    1701             : 
    1702         394 : static int guess_ni_flag(AVFormatContext *s)
    1703             : {
    1704             :     int i;
    1705         394 :     int64_t last_start = 0;
    1706         394 :     int64_t first_end  = INT64_MAX;
    1707         394 :     int64_t oldpos     = avio_tell(s->pb);
    1708             : 
    1709         827 :     for (i = 0; i < s->nb_streams; i++) {
    1710         433 :         AVStream *st = s->streams[i];
    1711         433 :         int n        = st->nb_index_entries;
    1712             :         unsigned int size;
    1713             : 
    1714         433 :         if (n <= 0)
    1715          53 :             continue;
    1716             : 
    1717         380 :         if (n >= 2) {
    1718         358 :             int64_t pos = st->index_entries[0].pos;
    1719             :             unsigned tag[2];
    1720         358 :             avio_seek(s->pb, pos, SEEK_SET);
    1721         358 :             tag[0] = avio_r8(s->pb);
    1722         358 :             tag[1] = avio_r8(s->pb);
    1723         358 :             avio_rl16(s->pb);
    1724         358 :             size = avio_rl32(s->pb);
    1725         358 :             if (get_stream_idx(tag) == i && pos + size > st->index_entries[1].pos)
    1726           0 :                 last_start = INT64_MAX;
    1727         358 :             if (get_stream_idx(tag) == i && size == st->index_entries[0].size + 8)
    1728           0 :                 last_start = INT64_MAX;
    1729             :         }
    1730             : 
    1731         380 :         if (st->index_entries[0].pos > last_start)
    1732         371 :             last_start = st->index_entries[0].pos;
    1733         380 :         if (st->index_entries[n - 1].pos < first_end)
    1734         367 :             first_end = st->index_entries[n - 1].pos;
    1735             :     }
    1736         394 :     avio_seek(s->pb, oldpos, SEEK_SET);
    1737             : 
    1738         394 :     if (last_start > first_end)
    1739           5 :         return 1;
    1740             : 
    1741         389 :     return check_stream_max_drift(s);
    1742             : }
    1743             : 
    1744         384 : static int avi_load_index(AVFormatContext *s)
    1745             : {
    1746         384 :     AVIContext *avi = s->priv_data;
    1747         384 :     AVIOContext *pb = s->pb;
    1748             :     uint32_t tag, size;
    1749         384 :     int64_t pos = avio_tell(pb);
    1750             :     int64_t next;
    1751         384 :     int ret     = -1;
    1752             : 
    1753         384 :     if (avio_seek(pb, avi->movi_end, SEEK_SET) < 0)
    1754           0 :         goto the_end; // maybe truncated file
    1755         384 :     av_log(s, AV_LOG_TRACE, "movi_end=0x%"PRIx64"\n", avi->movi_end);
    1756             :     for (;;) {
    1757        1106 :         tag  = avio_rl32(pb);
    1758         745 :         size = avio_rl32(pb);
    1759         745 :         if (avio_feof(pb))
    1760         361 :             break;
    1761         384 :         next = avio_tell(pb) + size + (size & 1);
    1762             : 
    1763        1152 :         av_log(s, AV_LOG_TRACE, "tag=%c%c%c%c size=0x%x\n",
    1764             :                  tag        & 0xff,
    1765         384 :                 (tag >>  8) & 0xff,
    1766         384 :                 (tag >> 16) & 0xff,
    1767             :                 (tag >> 24) & 0xff,
    1768             :                 size);
    1769             : 
    1770         737 :         if (tag == MKTAG('i', 'd', 'x', '1') &&
    1771         353 :             avi_read_idx1(s, size) >= 0) {
    1772         353 :             avi->index_loaded=2;
    1773         353 :             ret = 0;
    1774          31 :         }else if (tag == MKTAG('L', 'I', 'S', 'T')) {
    1775           8 :             uint32_t tag1 = avio_rl32(pb);
    1776             : 
    1777           8 :             if (tag1 == MKTAG('I', 'N', 'F', 'O'))
    1778           4 :                 ff_read_riff_info(s, size - 4);
    1779          23 :         }else if (!ret)
    1780          23 :             break;
    1781             : 
    1782         361 :         if (avio_seek(pb, next, SEEK_SET) < 0)
    1783           0 :             break; // something is wrong here
    1784             :     }
    1785             : 
    1786             : the_end:
    1787         384 :     avio_seek(pb, pos, SEEK_SET);
    1788         384 :     return ret;
    1789             : }
    1790             : 
    1791           0 : static void seek_subtitle(AVStream *st, AVStream *st2, int64_t timestamp)
    1792             : {
    1793           0 :     AVIStream *ast2 = st2->priv_data;
    1794           0 :     int64_t ts2     = av_rescale_q(timestamp, st->time_base, st2->time_base);
    1795           0 :     av_packet_unref(&ast2->sub_pkt);
    1796           0 :     if (avformat_seek_file(ast2->sub_ctx, 0, INT64_MIN, ts2, ts2, 0) >= 0 ||
    1797           0 :         avformat_seek_file(ast2->sub_ctx, 0, ts2, ts2, INT64_MAX, 0) >= 0)
    1798           0 :         ff_read_packet(ast2->sub_ctx, &ast2->sub_pkt);
    1799           0 : }
    1800             : 
    1801         728 : static int avi_read_seek(AVFormatContext *s, int stream_index,
    1802             :                          int64_t timestamp, int flags)
    1803             : {
    1804         728 :     AVIContext *avi = s->priv_data;
    1805             :     AVStream *st;
    1806             :     int i, index;
    1807             :     int64_t pos, pos_min;
    1808             :     AVIStream *ast;
    1809             : 
    1810             :     /* Does not matter which stream is requested dv in avi has the
    1811             :      * stream information in the first video stream.
    1812             :      */
    1813         728 :     if (avi->dv_demux)
    1814           0 :         stream_index = 0;
    1815             : 
    1816         728 :     if (!avi->index_loaded) {
    1817             :         /* we only load the index on demand */
    1818           0 :         avi_load_index(s);
    1819           0 :         avi->index_loaded |= 1;
    1820             :     }
    1821         728 :     av_assert0(stream_index >= 0);
    1822             : 
    1823         728 :     st    = s->streams[stream_index];
    1824         728 :     ast   = st->priv_data;
    1825         728 :     index = av_index_search_timestamp(st,
    1826         728 :                                       timestamp * FFMAX(ast->sample_size, 1),
    1827             :                                       flags);
    1828         728 :     if (index < 0) {
    1829         198 :         if (st->nb_index_entries > 0)
    1830         594 :             av_log(s, AV_LOG_DEBUG, "Failed to find timestamp %"PRId64 " in index %"PRId64 " .. %"PRId64 "\n",
    1831         198 :                    timestamp * FFMAX(ast->sample_size, 1),
    1832         198 :                    st->index_entries[0].timestamp,
    1833         198 :                    st->index_entries[st->nb_index_entries - 1].timestamp);
    1834         198 :         return AVERROR_INVALIDDATA;
    1835             :     }
    1836             : 
    1837             :     /* find the position */
    1838         530 :     pos       = st->index_entries[index].pos;
    1839         530 :     timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1);
    1840             : 
    1841         530 :     av_log(s, AV_LOG_TRACE, "XX %"PRId64" %d %"PRId64"\n",
    1842         530 :             timestamp, index, st->index_entries[index].timestamp);
    1843             : 
    1844         530 :     if (CONFIG_DV_DEMUXER && avi->dv_demux) {
    1845             :         /* One and only one real stream for DV in AVI, and it has video  */
    1846             :         /* offsets. Calling with other stream indexes should have failed */
    1847             :         /* the av_index_search_timestamp call above.                     */
    1848             : 
    1849           0 :         if (avio_seek(s->pb, pos, SEEK_SET) < 0)
    1850           0 :             return -1;
    1851             : 
    1852             :         /* Feed the DV video stream version of the timestamp to the */
    1853             :         /* DV demux so it can synthesize correct timestamps.        */
    1854           0 :         ff_dv_offset_reset(avi->dv_demux, timestamp);
    1855             : 
    1856           0 :         avi->stream_index = -1;
    1857           0 :         return 0;
    1858             :     }
    1859             : 
    1860         530 :     pos_min = pos;
    1861        1077 :     for (i = 0; i < s->nb_streams; i++) {
    1862         547 :         AVStream *st2   = s->streams[i];
    1863         547 :         AVIStream *ast2 = st2->priv_data;
    1864             : 
    1865         547 :         ast2->packet_size =
    1866         547 :         ast2->remaining   = 0;
    1867             : 
    1868         547 :         if (ast2->sub_ctx) {
    1869           0 :             seek_subtitle(st, st2, timestamp);
    1870           0 :             continue;
    1871             :         }
    1872             : 
    1873         547 :         if (st2->nb_index_entries <= 0)
    1874           0 :             continue;
    1875             : 
    1876             : //        av_assert1(st2->codecpar->block_align);
    1877        1094 :         index = av_index_search_timestamp(st2,
    1878         547 :                                           av_rescale_q(timestamp,
    1879             :                                                        st->time_base,
    1880             :                                                        st2->time_base) *
    1881         547 :                                           FFMAX(ast2->sample_size, 1),
    1882         547 :                                           flags |
    1883             :                                           AVSEEK_FLAG_BACKWARD |
    1884         547 :                                           (st2->codecpar->codec_type != AVMEDIA_TYPE_VIDEO ? AVSEEK_FLAG_ANY : 0));
    1885         547 :         if (index < 0)
    1886           0 :             index = 0;
    1887         547 :         ast2->seek_pos = st2->index_entries[index].pos;
    1888         547 :         pos_min = FFMIN(pos_min,ast2->seek_pos);
    1889             :     }
    1890        1077 :     for (i = 0; i < s->nb_streams; i++) {
    1891         547 :         AVStream *st2 = s->streams[i];
    1892         547 :         AVIStream *ast2 = st2->priv_data;
    1893             : 
    1894         547 :         if (ast2->sub_ctx || st2->nb_index_entries <= 0)
    1895           0 :             continue;
    1896             : 
    1897        1094 :         index = av_index_search_timestamp(
    1898             :                 st2,
    1899         547 :                 av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
    1900         547 :                 flags | AVSEEK_FLAG_BACKWARD | (st2->codecpar->codec_type != AVMEDIA_TYPE_VIDEO ? AVSEEK_FLAG_ANY : 0));
    1901         547 :         if (index < 0)
    1902           0 :             index = 0;
    1903        1105 :         while (!avi->non_interleaved && index>0 && st2->index_entries[index-1].pos >= pos_min)
    1904          11 :             index--;
    1905         547 :         ast2->frame_offset = st2->index_entries[index].timestamp;
    1906             :     }
    1907             : 
    1908             :     /* do the seek */
    1909         530 :     if (avio_seek(s->pb, pos_min, SEEK_SET) < 0) {
    1910           0 :         av_log(s, AV_LOG_ERROR, "Seek failed\n");
    1911           0 :         return -1;
    1912             :     }
    1913         530 :     avi->stream_index = -1;
    1914         530 :     avi->dts_max      = INT_MIN;
    1915         530 :     return 0;
    1916             : }
    1917             : 
    1918         394 : static int avi_read_close(AVFormatContext *s)
    1919             : {
    1920             :     int i;
    1921         394 :     AVIContext *avi = s->priv_data;
    1922             : 
    1923         827 :     for (i = 0; i < s->nb_streams; i++) {
    1924         433 :         AVStream *st   = s->streams[i];
    1925         433 :         AVIStream *ast = st->priv_data;
    1926         433 :         if (ast) {
    1927         433 :             if (ast->sub_ctx) {
    1928           0 :                 av_freep(&ast->sub_ctx->pb);
    1929           0 :                 avformat_close_input(&ast->sub_ctx);
    1930             :             }
    1931         433 :             av_freep(&ast->sub_buffer);
    1932         433 :             av_packet_unref(&ast->sub_pkt);
    1933             :         }
    1934             :     }
    1935             : 
    1936         394 :     av_freep(&avi->dv_demux);
    1937             : 
    1938         394 :     return 0;
    1939             : }
    1940             : 
    1941        5563 : static int avi_probe(AVProbeData *p)
    1942             : {
    1943             :     int i;
    1944             : 
    1945             :     /* check file header */
    1946       31416 :     for (i = 0; avi_headers[i][0]; i++)
    1947       28327 :         if (AV_RL32(p->buf    ) == AV_RL32(avi_headers[i]    ) &&
    1948        2080 :             AV_RL32(p->buf + 8) == AV_RL32(avi_headers[i] + 4))
    1949         394 :             return AVPROBE_SCORE_MAX;
    1950             : 
    1951        5169 :     return 0;
    1952             : }
    1953             : 
    1954             : AVInputFormat ff_avi_demuxer = {
    1955             :     .name           = "avi",
    1956             :     .long_name      = NULL_IF_CONFIG_SMALL("AVI (Audio Video Interleaved)"),
    1957             :     .priv_data_size = sizeof(AVIContext),
    1958             :     .extensions     = "avi",
    1959             :     .read_probe     = avi_probe,
    1960             :     .read_header    = avi_read_header,
    1961             :     .read_packet    = avi_read_packet,
    1962             :     .read_close     = avi_read_close,
    1963             :     .read_seek      = avi_read_seek,
    1964             :     .priv_class = &demuxer_class,
    1965             : };

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