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FFmpeg/libavformat/avidec.c

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  1. /*

  2.  * AVI demuxer

  3.  * Copyright (c) 2001 Fabrice Bellard

  4.  *

  5.  * This file is part of Libav.

  6.  *

  7.  * Libav 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.  * Libav 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 Libav; if not, write to the Free Software

  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  20.  */

  21. 

  22. #include <strings.h>

  23. #include "libavutil/intreadwrite.h"

  24. #include "libavutil/mathematics.h"

  25. #include "libavutil/bswap.h"

  26. #include "libavutil/dict.h"

  27. #include "avformat.h"

  28. #include "avi.h"

  29. #include "dv.h"

  30. #include "riff.h"

  31. 

  32. #undef NDEBUG

  33. #include <assert.h>

  34. 

  35. typedef struct AVIStream {

  36.     int64_t frame_offset; /* current frame (video) or byte (audio) counter

  37.                          (used to compute the pts) */

  38.     int remaining;

  39.     int packet_size;

  40. 

  41.     int scale;

  42.     int rate;

  43.     int sample_size; /* size of one sample (or packet) (in the rate/scale sense) in bytes */

  44. 

  45.     int64_t cum_len; /* temporary storage (used during seek) */

  46. 

  47.     int prefix;                       ///< normally 'd'<<8 + 'c' or 'w'<<8 + 'b'

  48.     int prefix_count;

  49.     uint32_t pal[256];

  50.     int has_pal;

  51.     int dshow_block_align;            ///< block align variable used to emulate bugs in the MS dshow demuxer

  52. 

  53.     AVFormatContext *sub_ctx;

  54.     AVPacket sub_pkt;

  55.     uint8_t *sub_buffer;

  56. } AVIStream;

  57. 

  58. typedef struct {

  59.     int64_t  riff_end;

  60.     int64_t  movi_end;

  61.     int64_t  fsize;

  62.     int64_t movi_list;

  63.     int64_t last_pkt_pos;

  64.     int index_loaded;

  65.     int is_odml;

  66.     int non_interleaved;

  67.     int stream_index;

  68.     DVDemuxContext* dv_demux;

  69.     int odml_depth;

  70. #define MAX_ODML_DEPTH 1000

  71. } AVIContext;

  72. 

  73. static const char avi_headers[][8] = {

  74.     { 'R', 'I', 'F', 'F',    'A', 'V', 'I', ' ' },

  75.     { 'R', 'I', 'F', 'F',    'A', 'V', 'I', 'X' },

  76.     { 'R', 'I', 'F', 'F',    'A', 'V', 'I', 0x19},

  77.     { 'O', 'N', '2', ' ',    'O', 'N', '2', 'f' },

  78.     { 'R', 'I', 'F', 'F',    'A', 'M', 'V', ' ' },

  79.     { 0 }

  80. };

  81. 

  82. static int avi_load_index(AVFormatContext *s);

  83. static int guess_ni_flag(AVFormatContext *s);

  84. 

  85. #define print_tag(str, tag, size)                       \

  86.     av_dlog(NULL, "%s: tag=%c%c%c%c size=0x%x\n",       \

  87.            str, tag & 0xff,                             \

  88.            (tag >> 8) & 0xff,                           \

  89.            (tag >> 16) & 0xff,                          \

  90.            (tag >> 24) & 0xff,                          \

  91.            size)

  92. 

  93. static inline int get_duration(AVIStream *ast, int len){

  94.     if(ast->sample_size){

  95.         return len;

  96.     }else if (ast->dshow_block_align){

  97.         return (len + ast->dshow_block_align - 1)/ast->dshow_block_align;

  98.     }else

  99.         return 1;

  100. }

  101. 

  102. static int get_riff(AVFormatContext *s, AVIOContext *pb)

  103. {

  104.     AVIContext *avi = s->priv_data;

  105.     char header[8];

  106.     int i;

  107. 

  108.     /* check RIFF header */

  109.     avio_read(pb, header, 4);

  110.     avi->riff_end = avio_rl32(pb);  /* RIFF chunk size */

  111.     avi->riff_end += avio_tell(pb); /* RIFF chunk end */

  112.     avio_read(pb, header+4, 4);

  113. 

  114.     for(i=0; avi_headers[i][0]; i++)

  115.         if(!memcmp(header, avi_headers[i], 8))

  116.             break;

  117.     if(!avi_headers[i][0])

  118.         return -1;

  119. 

  120.     if(header[7] == 0x19)

  121.         av_log(s, AV_LOG_INFO, "This file has been generated by a totally broken muxer.\n");

  122. 

  123.     return 0;

  124. }

  125. 

  126. static int read_braindead_odml_indx(AVFormatContext *s, int frame_num){

  127.     AVIContext *avi = s->priv_data;

  128.     AVIOContext *pb = s->pb;

  129.     int longs_pre_entry= avio_rl16(pb);

  130.     int index_sub_type = avio_r8(pb);

  131.     int index_type     = avio_r8(pb);

  132.     int entries_in_use = avio_rl32(pb);

  133.     int chunk_id       = avio_rl32(pb);

  134.     int64_t base       = avio_rl64(pb);

  135.     int stream_id= 10*((chunk_id&0xFF) - '0') + (((chunk_id>>8)&0xFF) - '0');

  136.     AVStream *st;

  137.     AVIStream *ast;

  138.     int i;

  139.     int64_t last_pos= -1;

  140.     int64_t filesize= avio_size(s->pb);

  141. 

  142.     av_dlog(s, "longs_pre_entry:%d index_type:%d entries_in_use:%d chunk_id:%X base:%16"PRIX64"\n",

  143.             longs_pre_entry,index_type, entries_in_use, chunk_id, base);

  144. 

  145.     if(stream_id >= s->nb_streams || stream_id < 0)

  146.         return -1;

  147.     st= s->streams[stream_id];

  148.     ast = st->priv_data;

  149. 

  150.     if(index_sub_type)

  151.         return -1;

  152. 

  153.     avio_rl32(pb);

  154. 

  155.     if(index_type && longs_pre_entry != 2)

  156.         return -1;

  157.     if(index_type>1)

  158.         return -1;

  159. 

  160.     if(filesize > 0 && base >= filesize){

  161.         av_log(s, AV_LOG_ERROR, "ODML index invalid\n");

  162.         if(base>>32 == (base & 0xFFFFFFFF) && (base & 0xFFFFFFFF) < filesize && filesize <= 0xFFFFFFFF)

  163.             base &= 0xFFFFFFFF;

  164.         else

  165.             return -1;

  166.     }

  167. 

  168.     for(i=0; i<entries_in_use; i++){

  169.         if(index_type){

  170.             int64_t pos= avio_rl32(pb) + base - 8;

  171.             int len    = avio_rl32(pb);

  172.             int key= len >= 0;

  173.             len &= 0x7FFFFFFF;

  174. 

  175.             av_dlog(s, "pos:%"PRId64", len:%X\n", pos, len);

  176. 

  177.             if(pb->eof_reached)

  178.                 return -1;

  179. 

  180.             if(last_pos == pos || pos == base - 8)

  181.                 avi->non_interleaved= 1;

  182.             if(last_pos != pos && (len || !ast->sample_size))

  183.                 av_add_index_entry(st, pos, ast->cum_len, len, 0, key ? AVINDEX_KEYFRAME : 0);

  184. 

  185.             ast->cum_len += get_duration(ast, len);

  186.             last_pos= pos;

  187.         }else{

  188.             int64_t offset, pos;

  189.             int duration;

  190.             offset = avio_rl64(pb);

  191.             avio_rl32(pb);       /* size */

  192.             duration = avio_rl32(pb);

  193. 

  194.             if(pb->eof_reached)

  195.                 return -1;

  196. 

  197.             pos = avio_tell(pb);

  198. 

  199.             if(avi->odml_depth > MAX_ODML_DEPTH){

  200.                 av_log(s, AV_LOG_ERROR, "Too deeply nested ODML indexes\n");

  201.                 return -1;

  202.             }

  203. 

  204.             avio_seek(pb, offset+8, SEEK_SET);

  205.             avi->odml_depth++;

  206.             read_braindead_odml_indx(s, frame_num);

  207.             avi->odml_depth--;

  208.             frame_num += duration;

  209. 

  210.             avio_seek(pb, pos, SEEK_SET);

  211.         }

  212.     }

  213.     avi->index_loaded=1;

  214.     return 0;

  215. }

  216. 

  217. static void clean_index(AVFormatContext *s){

  218.     int i;

  219.     int64_t j;

  220. 

  221.     for(i=0; i<s->nb_streams; i++){

  222.         AVStream *st = s->streams[i];

  223.         AVIStream *ast = st->priv_data;

  224.         int n= st->nb_index_entries;

  225.         int max= ast->sample_size;

  226.         int64_t pos, size, ts;

  227. 

  228.         if(n != 1 || ast->sample_size==0)

  229.             continue;

  230. 

  231.         while(max < 1024) max+=max;

  232. 

  233.         pos= st->index_entries[0].pos;

  234.         size= st->index_entries[0].size;

  235.         ts= st->index_entries[0].timestamp;

  236. 

  237.         for(j=0; j<size; j+=max){

  238.             av_add_index_entry(st, pos+j, ts+j, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME);

  239.         }

  240.     }

  241. }

  242. 

  243. static int avi_read_tag(AVFormatContext *s, AVStream *st, uint32_t tag, uint32_t size)

  244. {

  245.     AVIOContext *pb = s->pb;

  246.     char key[5] = {0}, *value;

  247. 

  248.     size += (size & 1);

  249. 

  250.     if (size == UINT_MAX)

  251.         return -1;

  252.     value = av_malloc(size+1);

  253.     if (!value)

  254.         return -1;

  255.     avio_read(pb, value, size);

  256.     value[size]=0;

  257. 

  258.     AV_WL32(key, tag);

  259. 

  260.     return av_dict_set(st ? &st->metadata : &s->metadata, key, value,

  261.                             AV_DICT_DONT_STRDUP_VAL);

  262. }

  263. 

  264. static void avi_read_info(AVFormatContext *s, uint64_t end)

  265. {

  266.     while (avio_tell(s->pb) < end) {

  267.         uint32_t tag  = avio_rl32(s->pb);

  268.         uint32_t size = avio_rl32(s->pb);

  269.         avi_read_tag(s, NULL, tag, size);

  270.     }

  271. }

  272. 

  273. static const char months[12][4] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",

  274.                                     "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };

  275. 

  276. static void avi_metadata_creation_time(AVDictionary **metadata, char *date)

  277. {

  278.     char month[4], time[9], buffer[64];

  279.     int i, day, year;

  280.     /* parse standard AVI date format (ie. "Mon Mar 10 15:04:43 2003") */

  281.     if (sscanf(date, "%*3s%*[ ]%3s%*[ ]%2d%*[ ]%8s%*[ ]%4d",

  282.                month, &day, time, &year) == 4) {

  283.         for (i=0; i<12; i++)

  284.             if (!strcasecmp(month, months[i])) {

  285.                 snprintf(buffer, sizeof(buffer), "%.4d-%.2d-%.2d %s",

  286.                          year, i+1, day, time);

  287.                 av_dict_set(metadata, "creation_time", buffer, 0);

  288.             }

  289.     } else if (date[4] == '/' && date[7] == '/') {

  290.         date[4] = date[7] = '-';

  291.         av_dict_set(metadata, "creation_time", date, 0);

  292.     }

  293. }

  294. 

  295. static void avi_read_nikon(AVFormatContext *s, uint64_t end)

  296. {

  297.     while (avio_tell(s->pb) < end) {

  298.         uint32_t tag  = avio_rl32(s->pb);

  299.         uint32_t size = avio_rl32(s->pb);

  300.         switch (tag) {

  301.         case MKTAG('n', 'c', 't', 'g'): {  /* Nikon Tags */

  302.             uint64_t tag_end = avio_tell(s->pb) + size;

  303.             while (avio_tell(s->pb) < tag_end) {

  304.                 uint16_t tag  = avio_rl16(s->pb);

  305.                 uint16_t size = avio_rl16(s->pb);

  306.                 const char *name = NULL;

  307.                 char buffer[64] = {0};

  308.                 size -= avio_read(s->pb, buffer,

  309.                                    FFMIN(size, sizeof(buffer)-1));

  310.                 switch (tag) {

  311.                 case 0x03:  name = "maker";  break;

  312.                 case 0x04:  name = "model";  break;

  313.                 case 0x13:  name = "creation_time";

  314.                     if (buffer[4] == ':' && buffer[7] == ':')

  315.                         buffer[4] = buffer[7] = '-';

  316.                     break;

  317.                 }

  318.                 if (name)

  319.                     av_dict_set(&s->metadata, name, buffer, 0);

  320.                 avio_skip(s->pb, size);

  321.             }

  322.             break;

  323.         }

  324.         default:

  325.             avio_skip(s->pb, size);

  326.             break;

  327.         }

  328.     }

  329. }

  330. 

  331. static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)

  332. {

  333.     AVIContext *avi = s->priv_data;

  334.     AVIOContext *pb = s->pb;

  335.     unsigned int tag, tag1, handler;

  336.     int codec_type, stream_index, frame_period;

  337.     unsigned int size;

  338.     int i;

  339.     AVStream *st;

  340.     AVIStream *ast = NULL;

  341.     int avih_width=0, avih_height=0;

  342.     int amv_file_format=0;

  343.     uint64_t list_end = 0;

  344.     int ret;

  345. 

  346.     avi->stream_index= -1;

  347. 

  348.     if (get_riff(s, pb) < 0)

  349.         return -1;

  350. 

  351.     avi->fsize = avio_size(pb);

  352.     if(avi->fsize<=0)

  353.         avi->fsize= avi->riff_end == 8 ? INT64_MAX : avi->riff_end;

  354. 

  355.     /* first list tag */

  356.     stream_index = -1;

  357.     codec_type = -1;

  358.     frame_period = 0;

  359.     for(;;) {

  360.         if (pb->eof_reached)

  361.             goto fail;

  362.         tag = avio_rl32(pb);

  363.         size = avio_rl32(pb);

  364. 

  365.         print_tag("tag", tag, size);

  366. 

  367.         switch(tag) {

  368.         case MKTAG('L', 'I', 'S', 'T'):

  369.             list_end = avio_tell(pb) + size;

  370.             /* Ignored, except at start of video packets. */

  371.             tag1 = avio_rl32(pb);

  372. 

  373.             print_tag("list", tag1, 0);

  374. 

  375.             if (tag1 == MKTAG('m', 'o', 'v', 'i')) {

  376.                 avi->movi_list = avio_tell(pb) - 4;

  377.                 if(size) avi->movi_end = avi->movi_list + size + (size & 1);

  378.                 else     avi->movi_end = avio_size(pb);

  379.                 av_dlog(NULL, "movi end=%"PRIx64"\n", avi->movi_end);

  380.                 goto end_of_header;

  381.             }

  382.             else if (tag1 == MKTAG('I', 'N', 'F', 'O'))

  383.                 avi_read_info(s, list_end);

  384.             else if (tag1 == MKTAG('n', 'c', 'd', 't'))

  385.                 avi_read_nikon(s, list_end);

  386. 

  387.             break;

  388.         case MKTAG('I', 'D', 'I', 'T'): {

  389.             unsigned char date[64] = {0};

  390.             size += (size & 1);

  391.             size -= avio_read(pb, date, FFMIN(size, sizeof(date)-1));

  392.             avio_skip(pb, size);

  393.             avi_metadata_creation_time(&s->metadata, date);

  394.             break;

  395.         }

  396.         case MKTAG('d', 'm', 'l', 'h'):

  397.             avi->is_odml = 1;

  398.             avio_skip(pb, size + (size & 1));

  399.             break;

  400.         case MKTAG('a', 'm', 'v', 'h'):

  401.             amv_file_format=1;

  402.         case MKTAG('a', 'v', 'i', 'h'):

  403.             /* AVI header */

  404.             /* using frame_period is bad idea */

  405.             frame_period = avio_rl32(pb);

  406.             avio_skip(pb, 4);

  407.             avio_rl32(pb);

  408.             avi->non_interleaved |= avio_rl32(pb) & AVIF_MUSTUSEINDEX;

  409. 

  410.             avio_skip(pb, 2 * 4);

  411.             avio_rl32(pb);

  412.             avio_rl32(pb);

  413.             avih_width=avio_rl32(pb);

  414.             avih_height=avio_rl32(pb);

  415. 

  416.             avio_skip(pb, size - 10 * 4);

  417.             break;

  418.         case MKTAG('s', 't', 'r', 'h'):

  419.             /* stream header */

  420. 

  421.             tag1 = avio_rl32(pb);

  422.             handler = avio_rl32(pb); /* codec tag */

  423. 

  424.             if(tag1 == MKTAG('p', 'a', 'd', 's')){

  425.                 avio_skip(pb, size - 8);

  426.                 break;

  427.             }else{

  428.                 stream_index++;

  429.                 st = av_new_stream(s, stream_index);

  430.                 if (!st)

  431.                     goto fail;

  432. 

  433.                 ast = av_mallocz(sizeof(AVIStream));

  434.                 if (!ast)

  435.                     goto fail;

  436.                 st->priv_data = ast;

  437.             }

  438.             if(amv_file_format)

  439.                 tag1 = stream_index ? MKTAG('a','u','d','s') : MKTAG('v','i','d','s');

  440. 

  441.             print_tag("strh", tag1, -1);

  442. 

  443.             if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){

  444.                 int64_t dv_dur;

  445. 

  446.                 /*

  447.                  * After some consideration -- I don't think we

  448.                  * have to support anything but DV in type1 AVIs.

  449.                  */

  450.                 if (s->nb_streams != 1)

  451.                     goto fail;

  452. 

  453.                 if (handler != MKTAG('d', 'v', 's', 'd') &&

  454.                     handler != MKTAG('d', 'v', 'h', 'd') &&

  455.                     handler != MKTAG('d', 'v', 's', 'l'))

  456.                    goto fail;

  457. 

  458.                 ast = s->streams[0]->priv_data;

  459.                 av_freep(&s->streams[0]->codec->extradata);

  460.                 av_freep(&s->streams[0]->codec);

  461.                 av_freep(&s->streams[0]);

  462.                 s->nb_streams = 0;

  463.                 if (CONFIG_DV_DEMUXER) {

  464.                     avi->dv_demux = dv_init_demux(s);

  465.                     if (!avi->dv_demux)

  466.                         goto fail;

  467.                 }

  468.                 s->streams[0]->priv_data = ast;

  469.                 avio_skip(pb, 3 * 4);

  470.                 ast->scale = avio_rl32(pb);

  471.                 ast->rate = avio_rl32(pb);

  472.                 avio_skip(pb, 4);  /* start time */

  473. 

  474.                 dv_dur = avio_rl32(pb);

  475.                 if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {

  476.                     dv_dur *= AV_TIME_BASE;

  477.                     s->duration = av_rescale(dv_dur, ast->scale, ast->rate);

  478.                 }

  479.                 /*

  480.                  * else, leave duration alone; timing estimation in utils.c

  481.                  *      will make a guess based on bitrate.

  482.                  */

  483. 

  484.                 stream_index = s->nb_streams - 1;

  485.                 avio_skip(pb, size - 9*4);

  486.                 break;

  487.             }

  488. 

  489.             assert(stream_index < s->nb_streams);

  490.             st->codec->stream_codec_tag= handler;

  491. 

  492.             avio_rl32(pb); /* flags */

  493.             avio_rl16(pb); /* priority */

  494.             avio_rl16(pb); /* language */

  495.             avio_rl32(pb); /* initial frame */

  496.             ast->scale = avio_rl32(pb);

  497.             ast->rate = avio_rl32(pb);

  498.             if(!(ast->scale && ast->rate)){

  499.                 av_log(s, AV_LOG_WARNING, "scale/rate is %u/%u which is invalid. (This file has been generated by broken software.)\n", ast->scale, ast->rate);

  500.                 if(frame_period){

  501.                     ast->rate = 1000000;

  502.                     ast->scale = frame_period;

  503.                 }else{

  504.                     ast->rate = 25;

  505.                     ast->scale = 1;

  506.                 }

  507.             }

  508.             av_set_pts_info(st, 64, ast->scale, ast->rate);

  509. 

  510.             ast->cum_len=avio_rl32(pb); /* start */

  511.             st->nb_frames = avio_rl32(pb);

  512. 

  513.             st->start_time = 0;

  514.             avio_rl32(pb); /* buffer size */

  515.             avio_rl32(pb); /* quality */

  516.             ast->sample_size = avio_rl32(pb); /* sample ssize */

  517.             ast->cum_len *= FFMAX(1, ast->sample_size);

  518. //            av_log(s, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);

  519. 

  520.             switch(tag1) {

  521.             case MKTAG('v', 'i', 'd', 's'):

  522.                 codec_type = AVMEDIA_TYPE_VIDEO;

  523. 

  524.                 ast->sample_size = 0;

  525.                 break;

  526.             case MKTAG('a', 'u', 'd', 's'):

  527.                 codec_type = AVMEDIA_TYPE_AUDIO;

  528.                 break;

  529.             case MKTAG('t', 'x', 't', 's'):

  530.                 codec_type = AVMEDIA_TYPE_SUBTITLE;

  531.                 break;

  532.             case MKTAG('d', 'a', 't', 's'):

  533.                 codec_type = AVMEDIA_TYPE_DATA;

  534.                 break;

  535.             default:

  536.                 av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);

  537.                 goto fail;

  538.             }

  539.             if(ast->sample_size == 0)

  540.                 st->duration = st->nb_frames;

  541.             ast->frame_offset= ast->cum_len;

  542.             avio_skip(pb, size - 12 * 4);

  543.             break;

  544.         case MKTAG('s', 't', 'r', 'f'):

  545.             /* stream header */

  546.             if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {

  547.                 avio_skip(pb, size);

  548.             } else {

  549.                 uint64_t cur_pos = avio_tell(pb);

  550.                 if (cur_pos < list_end)

  551.                     size = FFMIN(size, list_end - cur_pos);

  552.                 st = s->streams[stream_index];

  553.                 switch(codec_type) {

  554.                 case AVMEDIA_TYPE_VIDEO:

  555.                     if(amv_file_format){

  556.                         st->codec->width=avih_width;

  557.                         st->codec->height=avih_height;

  558.                         st->codec->codec_type = AVMEDIA_TYPE_VIDEO;

  559.                         st->codec->codec_id = CODEC_ID_AMV;

  560.                         avio_skip(pb, size);

  561.                         break;

  562.                     }

  563.                     tag1 = ff_get_bmp_header(pb, st);

  564. 

  565.                     if (tag1 == MKTAG('D', 'X', 'S', 'B') || tag1 == MKTAG('D','X','S','A')) {

  566.                         st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;

  567.                         st->codec->codec_tag = tag1;

  568.                         st->codec->codec_id = CODEC_ID_XSUB;

  569.                         break;

  570.                     }

  571. 

  572.                     if(size > 10*4 && size<(1<<30)){

  573.                         st->codec->extradata_size= size - 10*4;

  574.                         st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);

  575.                         if (!st->codec->extradata) {

  576.                             st->codec->extradata_size= 0;

  577.                             return AVERROR(ENOMEM);

  578.                         }

  579.                         avio_read(pb, st->codec->extradata, st->codec->extradata_size);

  580.                     }

  581. 

  582.                     if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly

  583.                         avio_r8(pb);

  584. 

  585.                     /* Extract palette from extradata if bpp <= 8. */

  586.                     /* This code assumes that extradata contains only palette. */

  587.                     /* This is true for all paletted codecs implemented in Libav. */

  588.                     if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {

  589.                         int pal_size = (1 << st->codec->bits_per_coded_sample) << 2;

  590.                         const uint8_t *pal_src;

  591. 

  592.                         pal_size = FFMIN(pal_size, st->codec->extradata_size);

  593.                         pal_src = st->codec->extradata + st->codec->extradata_size - pal_size;

  594. #if HAVE_BIGENDIAN

  595.                         for (i = 0; i < pal_size/4; i++)

  596.                             ast->pal[i] = av_bswap32(((uint32_t*)pal_src)[i]);

  597. #else

  598.                         memcpy(ast->pal, pal_src, pal_size);

  599. #endif

  600.                         ast->has_pal = 1;

  601.                     }

  602. 

  603.                     print_tag("video", tag1, 0);

  604. 

  605.                     st->codec->codec_type = AVMEDIA_TYPE_VIDEO;

  606.                     st->codec->codec_tag = tag1;

  607.                     st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);

  608.                     st->need_parsing = AVSTREAM_PARSE_HEADERS; // This is needed to get the pict type which is necessary for generating correct pts.

  609.                     // Support "Resolution 1:1" for Avid AVI Codec

  610.                     if(tag1 == MKTAG('A', 'V', 'R', 'n') &&

  611.                        st->codec->extradata_size >= 31 &&

  612.                        !memcmp(&st->codec->extradata[28], "1:1", 3))

  613.                         st->codec->codec_id = CODEC_ID_RAWVIDEO;

  614. 

  615.                     if(st->codec->codec_tag==0 && st->codec->height > 0 && st->codec->extradata_size < 1U<<30){

  616.                         st->codec->extradata_size+= 9;

  617.                         st->codec->extradata= av_realloc(st->codec->extradata, st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);

  618.                         if(st->codec->extradata)

  619.                             memcpy(st->codec->extradata + st->codec->extradata_size - 9, "BottomUp", 9);

  620.                     }

  621.                     st->codec->height= FFABS(st->codec->height);

  622. 

  623. //                    avio_skip(pb, size - 5 * 4);

  624.                     break;

  625.                 case AVMEDIA_TYPE_AUDIO:

  626.                     ret = ff_get_wav_header(pb, st->codec, size);

  627.                     if (ret < 0)

  628.                         return ret;

  629.                     ast->dshow_block_align= st->codec->block_align;

  630.                     if(ast->sample_size && st->codec->block_align && ast->sample_size != st->codec->block_align){

  631.                         av_log(s, AV_LOG_WARNING, "sample size (%d) != block align (%d)\n", ast->sample_size, st->codec->block_align);

  632.                         ast->sample_size= st->codec->block_align;

  633.                     }

  634.                     if (size&1) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */

  635.                         avio_skip(pb, 1);

  636.                     /* Force parsing as several audio frames can be in

  637.                      * one packet and timestamps refer to packet start. */

  638.                     st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;

  639.                     /* ADTS header is in extradata, AAC without header must be

  640.                      * stored as exact frames. Parser not needed and it will

  641.                      * fail. */

  642.                     if (st->codec->codec_id == CODEC_ID_AAC && st->codec->extradata_size)

  643.                         st->need_parsing = AVSTREAM_PARSE_NONE;

  644.                     /* AVI files with Xan DPCM audio (wrongly) declare PCM

  645.                      * audio in the header but have Axan as stream_code_tag. */

  646.                     if (st->codec->stream_codec_tag == AV_RL32("Axan")){

  647.                         st->codec->codec_id  = CODEC_ID_XAN_DPCM;

  648.                         st->codec->codec_tag = 0;

  649.                     }

  650.                     if (amv_file_format){

  651.                         st->codec->codec_id  = CODEC_ID_ADPCM_IMA_AMV;

  652.                         ast->dshow_block_align = 0;

  653.                     }

  654.                     break;

  655.                 case AVMEDIA_TYPE_SUBTITLE:

  656.                     st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;

  657.                     st->codec->codec_id   = CODEC_ID_PROBE;

  658.                     break;

  659.                 default:

  660.                     st->codec->codec_type = AVMEDIA_TYPE_DATA;

  661.                     st->codec->codec_id= CODEC_ID_NONE;

  662.                     st->codec->codec_tag= 0;

  663.                     avio_skip(pb, size);

  664.                     break;

  665.                 }

  666.             }

  667.             break;

  668.         case MKTAG('i', 'n', 'd', 'x'):

  669.             i= avio_tell(pb);

  670.             if(pb->seekable && !(s->flags & AVFMT_FLAG_IGNIDX)){

  671.                 read_braindead_odml_indx(s, 0);

  672.             }

  673.             avio_seek(pb, i+size, SEEK_SET);

  674.             break;

  675.         case MKTAG('v', 'p', 'r', 'p'):

  676.             if(stream_index < (unsigned)s->nb_streams && size > 9*4){

  677.                 AVRational active, active_aspect;

  678. 

  679.                 st = s->streams[stream_index];

  680.                 avio_rl32(pb);

  681.                 avio_rl32(pb);

  682.                 avio_rl32(pb);

  683.                 avio_rl32(pb);

  684.                 avio_rl32(pb);

  685. 

  686.                 active_aspect.den= avio_rl16(pb);

  687.                 active_aspect.num= avio_rl16(pb);

  688.                 active.num       = avio_rl32(pb);

  689.                 active.den       = avio_rl32(pb);

  690.                 avio_rl32(pb); //nbFieldsPerFrame

  691. 

  692.                 if(active_aspect.num && active_aspect.den && active.num && active.den){

  693.                     st->sample_aspect_ratio= av_div_q(active_aspect, active);

  694. //av_log(s, AV_LOG_ERROR, "vprp %d/%d %d/%d\n", active_aspect.num, active_aspect.den, active.num, active.den);

  695.                 }

  696.                 size -= 9*4;

  697.             }

  698.             avio_skip(pb, size);

  699.             break;

  700.         case MKTAG('s', 't', 'r', 'n'):

  701.             if(s->nb_streams){

  702.                 avi_read_tag(s, s->streams[s->nb_streams-1], tag, size);

  703.                 break;

  704.             }

  705.         default:

  706.             if(size > 1000000){

  707.                 av_log(s, AV_LOG_ERROR, "Something went wrong during header parsing, "

  708.                                         "I will ignore it and try to continue anyway.\n");

  709.                 avi->movi_list = avio_tell(pb) - 4;

  710.                 avi->movi_end  = avio_size(pb);

  711.                 goto end_of_header;

  712.             }

  713.             /* skip tag */

  714.             size += (size & 1);

  715.             avio_skip(pb, size);

  716.             break;

  717.         }

  718.     }

  719.  end_of_header:

  720.     /* check stream number */

  721.     if (stream_index != s->nb_streams - 1) {

  722.     fail:

  723.         return -1;

  724.     }

  725. 

  726.     if(!avi->index_loaded && pb->seekable)

  727.         avi_load_index(s);

  728.     avi->index_loaded = 1;

  729.     avi->non_interleaved |= guess_ni_flag(s);

  730.     for(i=0; i<s->nb_streams; i++){

  731.         AVStream *st = s->streams[i];

  732.         if(st->nb_index_entries)

  733.             break;

  734.     }

  735.     if(i==s->nb_streams && avi->non_interleaved) {

  736.         av_log(s, AV_LOG_WARNING, "non-interleaved AVI without index, switching to interleaved\n");

  737.         avi->non_interleaved=0;

  738.     }

  739. 

  740.     if(avi->non_interleaved) {

  741.         av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");

  742.         clean_index(s);

  743.     }

  744. 

  745.     ff_metadata_conv_ctx(s, NULL, ff_avi_metadata_conv);

  746. 

  747.     return 0;

  748. }

  749. 

  750. static int read_gab2_sub(AVStream *st, AVPacket *pkt) {

  751.     if (!strcmp(pkt->data, "GAB2") && AV_RL16(pkt->data+5) == 2) {

  752.         uint8_t desc[256];

  753.         int score = AVPROBE_SCORE_MAX / 2, ret;

  754.         AVIStream *ast = st->priv_data;

  755.         AVInputFormat *sub_demuxer;

  756.         AVRational time_base;

  757.         AVIOContext *pb = avio_alloc_context( pkt->data + 7,

  758.                                               pkt->size - 7,

  759.                                               0, NULL, NULL, NULL, NULL);

  760.         AVProbeData pd;

  761.         unsigned int desc_len = avio_rl32(pb);

  762. 

  763.         if (desc_len > pb->buf_end - pb->buf_ptr)

  764.             goto error;

  765. 

  766.         ret = avio_get_str16le(pb, desc_len, desc, sizeof(desc));

  767.         avio_skip(pb, desc_len - ret);

  768.         if (*desc)

  769.             av_dict_set(&st->metadata, "title", desc, 0);

  770. 

  771.         avio_rl16(pb);   /* flags? */

  772.         avio_rl32(pb);   /* data size */

  773. 

  774.         pd = (AVProbeData) { .buf = pb->buf_ptr, .buf_size = pb->buf_end - pb->buf_ptr };

  775.         if (!(sub_demuxer = av_probe_input_format2(&pd, 1, &score)))

  776.             goto error;

  777. 

  778.         if (!(ast->sub_ctx = avformat_alloc_context()))

  779.             goto error;

  780. 

  781.         ast->sub_ctx->pb      = pb;

  782.         if (!avformat_open_input(&ast->sub_ctx, "", sub_demuxer, NULL)) {

  783.             av_read_packet(ast->sub_ctx, &ast->sub_pkt);

  784.             *st->codec = *ast->sub_ctx->streams[0]->codec;

  785.             ast->sub_ctx->streams[0]->codec->extradata = NULL;

  786.             time_base = ast->sub_ctx->streams[0]->time_base;

  787.             av_set_pts_info(st, 64, time_base.num, time_base.den);

  788.         }

  789.         ast->sub_buffer = pkt->data;

  790.         memset(pkt, 0, sizeof(*pkt));

  791.         return 1;

  792. error:

  793.         av_freep(&pb);

  794.     }

  795.     return 0;

  796. }

  797. 

  798. static AVStream *get_subtitle_pkt(AVFormatContext *s, AVStream *next_st,

  799.                                   AVPacket *pkt)

  800. {

  801.     AVIStream *ast, *next_ast = next_st->priv_data;

  802.     int64_t ts, next_ts, ts_min = INT64_MAX;

  803.     AVStream *st, *sub_st = NULL;

  804.     int i;

  805. 

  806.     next_ts = av_rescale_q(next_ast->frame_offset, next_st->time_base,

  807.                            AV_TIME_BASE_Q);

  808. 

  809.     for (i=0; i<s->nb_streams; i++) {

  810.         st  = s->streams[i];

  811.         ast = st->priv_data;

  812.         if (st->discard < AVDISCARD_ALL && ast && ast->sub_pkt.data) {

  813.             ts = av_rescale_q(ast->sub_pkt.dts, st->time_base, AV_TIME_BASE_Q);

  814.             if (ts <= next_ts && ts < ts_min) {

  815.                 ts_min = ts;

  816.                 sub_st = st;

  817.             }

  818.         }

  819.     }

  820. 

  821.     if (sub_st) {

  822.         ast = sub_st->priv_data;

  823.         *pkt = ast->sub_pkt;

  824.         pkt->stream_index = sub_st->index;

  825.         if (av_read_packet(ast->sub_ctx, &ast->sub_pkt) < 0)

  826.             ast->sub_pkt.data = NULL;

  827.     }

  828.     return sub_st;

  829. }

  830. 

  831. static int get_stream_idx(int *d){

  832.     if(    d[0] >= '0' && d[0] <= '9'

  833.         && d[1] >= '0' && d[1] <= '9'){

  834.         return (d[0] - '0') * 10 + (d[1] - '0');

  835.     }else{

  836.         return 100; //invalid stream ID

  837.     }

  838. }

  839. 

  840. static int avi_sync(AVFormatContext *s, int exit_early)

  841. {

  842.     AVIContext *avi = s->priv_data;

  843.     AVIOContext *pb = s->pb;

  844.     int n, d[8];

  845.     unsigned int size;

  846.     int64_t i, sync;

  847. 

  848. start_sync:

  849.     memset(d, -1, sizeof(int)*8);

  850.     for(i=sync=avio_tell(pb); !pb->eof_reached; i++) {

  851.         int j;

  852. 

  853.         for(j=0; j<7; j++)

  854.             d[j]= d[j+1];

  855.         d[7]= avio_r8(pb);

  856. 

  857.         size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);

  858. 

  859.         n= get_stream_idx(d+2);

  860. //av_log(s, AV_LOG_DEBUG, "%X %X %X %X %X %X %X %X %"PRId64" %d %d\n", d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], i, size, n);

  861.         if(i + (uint64_t)size > avi->fsize || d[0]<0)

  862.             continue;

  863. 

  864.         //parse ix##

  865.         if(  (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)

  866.         //parse JUNK

  867.            ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')

  868.            ||(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')){

  869.             avio_skip(pb, size);

  870. //av_log(s, AV_LOG_DEBUG, "SKIP\n");

  871.             goto start_sync;

  872.         }

  873. 

  874.         //parse stray LIST

  875.         if(d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T'){

  876.             avio_skip(pb, 4);

  877.             goto start_sync;

  878.         }

  879. 

  880.         n= get_stream_idx(d);

  881. 

  882.         if(!((i-avi->last_pkt_pos)&1) && get_stream_idx(d+1) < s->nb_streams)

  883.             continue;

  884. 

  885.         //detect ##ix chunk and skip

  886.         if(d[2] == 'i' && d[3] == 'x' && n < s->nb_streams){

  887.             avio_skip(pb, size);

  888.             goto start_sync;

  889.         }

  890. 

  891.         //parse ##dc/##wb

  892.         if(n < s->nb_streams){

  893.             AVStream *st;

  894.             AVIStream *ast;

  895.             st = s->streams[n];

  896.             ast = st->priv_data;

  897. 

  898.             if(s->nb_streams>=2){

  899.                 AVStream *st1  = s->streams[1];

  900.                 AVIStream *ast1= st1->priv_data;

  901.                 //workaround for broken small-file-bug402.avi

  902.                 if(   d[2] == 'w' && d[3] == 'b'

  903.                    && n==0

  904.                    && st ->codec->codec_type == AVMEDIA_TYPE_VIDEO

  905.                    && st1->codec->codec_type == AVMEDIA_TYPE_AUDIO

  906.                    && ast->prefix == 'd'*256+'c'

  907.                    && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)

  908.                   ){

  909.                     n=1;

  910.                     st = st1;

  911.                     ast = ast1;

  912.                     av_log(s, AV_LOG_WARNING, "Invalid stream + prefix combination, assuming audio.\n");

  913.                 }

  914.             }

  915. 

  916. 

  917.             if(   (st->discard >= AVDISCARD_DEFAULT && size==0)

  918.                /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & AV_PKT_FLAG_KEY))*/ //FIXME needs a little reordering

  919.                || st->discard >= AVDISCARD_ALL){

  920.                 if (!exit_early) {

  921.                     ast->frame_offset += get_duration(ast, size);

  922.                 }

  923.                 avio_skip(pb, size);

  924.                 goto start_sync;

  925.             }

  926. 

  927.             if (d[2] == 'p' && d[3] == 'c' && size<=4*256+4) {

  928.                 int k = avio_r8(pb);

  929.                 int last = (k + avio_r8(pb) - 1) & 0xFF;

  930. 

  931.                 avio_rl16(pb); //flags

  932. 

  933.                 for (; k <= last; k++)

  934.                     ast->pal[k] = avio_rb32(pb)>>8;// b + (g << 8) + (r << 16);

  935.                 ast->has_pal= 1;

  936.                 goto start_sync;

  937.             } else if(   ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||

  938.                          d[2]*256+d[3] == ast->prefix /*||

  939.                          (d[2] == 'd' && d[3] == 'c') ||

  940.                          (d[2] == 'w' && d[3] == 'b')*/) {

  941. 

  942.                 if (exit_early)

  943.                     return 0;

  944. //av_log(s, AV_LOG_DEBUG, "OK\n");

  945.                 if(d[2]*256+d[3] == ast->prefix)

  946.                     ast->prefix_count++;

  947.                 else{

  948.                     ast->prefix= d[2]*256+d[3];

  949.                     ast->prefix_count= 0;

  950.                 }

  951. 

  952.                 avi->stream_index= n;

  953.                 ast->packet_size= size + 8;

  954.                 ast->remaining= size;

  955. 

  956.                 if(size || !ast->sample_size){

  957.                     uint64_t pos= avio_tell(pb) - 8;

  958.                     if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){

  959.                         av_add_index_entry(st, pos, ast->frame_offset, size, 0, AVINDEX_KEYFRAME);

  960.                     }

  961.                 }

  962.                 return 0;

  963.             }

  964.         }

  965.     }

  966. 

  967.     return AVERROR_EOF;

  968. }

  969. 

  970. static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)

  971. {

  972.     AVIContext *avi = s->priv_data;

  973.     AVIOContext *pb = s->pb;

  974.     int err;

  975.     void* dstr;

  976. 

  977.     if (CONFIG_DV_DEMUXER && avi->dv_demux) {

  978.         int size = dv_get_packet(avi->dv_demux, pkt);

  979.         if (size >= 0)

  980.             return size;

  981.     }

  982. 

  983.     if(avi->non_interleaved){

  984.         int best_stream_index = 0;

  985.         AVStream *best_st= NULL;

  986.         AVIStream *best_ast;

  987.         int64_t best_ts= INT64_MAX;

  988.         int i;

  989. 

  990.         for(i=0; i<s->nb_streams; i++){

  991.             AVStream *st = s->streams[i];

  992.             AVIStream *ast = st->priv_data;

  993.             int64_t ts= ast->frame_offset;

  994.             int64_t last_ts;

  995. 

  996.             if(!st->nb_index_entries)

  997.                 continue;

  998. 

  999.             last_ts = st->index_entries[st->nb_index_entries - 1].timestamp;

  1000.             if(!ast->remaining && ts > last_ts)

  1001.                 continue;

  1002. 

  1003.             ts = av_rescale_q(ts, st->time_base, (AVRational){FFMAX(1, ast->sample_size), AV_TIME_BASE});

  1004. 

  1005. //            av_log(s, AV_LOG_DEBUG, "%"PRId64" %d/%d %"PRId64"\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);

  1006.             if(ts < best_ts){

  1007.                 best_ts= ts;

  1008.                 best_st= st;

  1009.                 best_stream_index= i;

  1010.             }

  1011.         }

  1012.         if(!best_st)

  1013.             return -1;

  1014. 

  1015.         best_ast = best_st->priv_data;

  1016.         best_ts = av_rescale_q(best_ts, (AVRational){FFMAX(1, best_ast->sample_size), AV_TIME_BASE}, best_st->time_base);

  1017.         if(best_ast->remaining)

  1018.             i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);

  1019.         else{

  1020.             i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);

  1021.             if(i>=0)

  1022.                 best_ast->frame_offset= best_st->index_entries[i].timestamp;

  1023.         }

  1024. 

  1025. //        av_log(s, AV_LOG_DEBUG, "%d\n", i);

  1026.         if(i>=0){

  1027.             int64_t pos= best_st->index_entries[i].pos;

  1028.             pos += best_ast->packet_size - best_ast->remaining;

  1029.             avio_seek(s->pb, pos + 8, SEEK_SET);

  1030. //        av_log(s, AV_LOG_DEBUG, "pos=%"PRId64"\n", pos);

  1031. 

  1032.             assert(best_ast->remaining <= best_ast->packet_size);

  1033. 

  1034.             avi->stream_index= best_stream_index;

  1035.             if(!best_ast->remaining)

  1036.                 best_ast->packet_size=

  1037.                 best_ast->remaining= best_st->index_entries[i].size;

  1038.         }

  1039.     }

  1040. 

  1041. resync:

  1042.     if(avi->stream_index >= 0){

  1043.         AVStream *st= s->streams[ avi->stream_index ];

  1044.         AVIStream *ast= st->priv_data;

  1045.         int size, err;

  1046. 

  1047.         if(get_subtitle_pkt(s, st, pkt))

  1048.             return 0;

  1049. 

  1050.         if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM

  1051.             size= INT_MAX;

  1052.         else if(ast->sample_size < 32)

  1053.             // arbitrary multiplier to avoid tiny packets for raw PCM data

  1054.             size= 1024*ast->sample_size;

  1055.         else

  1056.             size= ast->sample_size;

  1057. 

  1058.         if(size > ast->remaining)

  1059.             size= ast->remaining;

  1060.         avi->last_pkt_pos= avio_tell(pb);

  1061.         err= av_get_packet(pb, pkt, size);

  1062.         if(err<0)

  1063.             return err;

  1064. 

  1065.         if(ast->has_pal && pkt->data && pkt->size<(unsigned)INT_MAX/2){

  1066.             uint8_t *pal;

  1067.             pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, AVPALETTE_SIZE);

  1068.             if(!pal){

  1069.                 av_log(s, AV_LOG_ERROR, "Failed to allocate data for palette\n");

  1070.             }else{

  1071.                 memcpy(pal, ast->pal, AVPALETTE_SIZE);

  1072.                 ast->has_pal = 0;

  1073.             }

  1074.         }

  1075. 

  1076.         if (CONFIG_DV_DEMUXER && avi->dv_demux) {

  1077.             dstr = pkt->destruct;

  1078.             size = dv_produce_packet(avi->dv_demux, pkt,

  1079.                                     pkt->data, pkt->size);

  1080.             pkt->destruct = dstr;

  1081.             pkt->flags |= AV_PKT_FLAG_KEY;

  1082.             if (size < 0)

  1083.                 av_free_packet(pkt);

  1084.         } else if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE

  1085.                    && !st->codec->codec_tag && read_gab2_sub(st, pkt)) {

  1086.             ast->frame_offset++;

  1087.             avi->stream_index = -1;

  1088.             ast->remaining = 0;

  1089.             goto resync;

  1090.         } else {

  1091.             /* XXX: How to handle B-frames in AVI? */

  1092.             pkt->dts = ast->frame_offset;

  1093. //                pkt->dts += ast->start;

  1094.             if(ast->sample_size)

  1095.                 pkt->dts /= ast->sample_size;

  1096. //av_log(s, AV_LOG_DEBUG, "dts:%"PRId64" offset:%"PRId64" %d/%d smpl_siz:%d base:%d st:%d size:%d\n", pkt->dts, ast->frame_offset, ast->scale, ast->rate, ast->sample_size, AV_TIME_BASE, avi->stream_index, size);

  1097.             pkt->stream_index = avi->stream_index;

  1098. 

  1099.             if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {

  1100.                 AVIndexEntry *e;

  1101.                 int index;

  1102.                 assert(st->index_entries);

  1103. 

  1104.                 index= av_index_search_timestamp(st, ast->frame_offset, 0);

  1105.                 e= &st->index_entries[index];

  1106. 

  1107.                 if(index >= 0 && e->timestamp == ast->frame_offset){

  1108.                     if (e->flags & AVINDEX_KEYFRAME)

  1109.                         pkt->flags |= AV_PKT_FLAG_KEY;

  1110.                 }

  1111.             } else {

  1112.                 pkt->flags |= AV_PKT_FLAG_KEY;

  1113.             }

  1114.             ast->frame_offset += get_duration(ast, pkt->size);

  1115.         }

  1116.         ast->remaining -= size;

  1117.         if(!ast->remaining){

  1118.             avi->stream_index= -1;

  1119.             ast->packet_size= 0;

  1120.         }

  1121. 

  1122.         return size;

  1123.     }

  1124. 

  1125.     if ((err = avi_sync(s, 0)) < 0)

  1126.         return err;

  1127.     goto resync;

  1128. }

  1129. 

  1130. /* XXX: We make the implicit supposition that the positions are sorted

  1131.    for each stream. */

  1132. static int avi_read_idx1(AVFormatContext *s, int size)

  1133. {

  1134.     AVIContext *avi = s->priv_data;

  1135.     AVIOContext *pb = s->pb;

  1136.     int nb_index_entries, i;

  1137.     AVStream *st;

  1138.     AVIStream *ast;

  1139.     unsigned int index, tag, flags, pos, len, first_packet = 1;

  1140.     unsigned last_pos= -1;

  1141.     int64_t idx1_pos, first_packet_pos = 0, data_offset = 0;

  1142. 

  1143.     nb_index_entries = size / 16;

  1144.     if (nb_index_entries <= 0)

  1145.         return -1;

  1146. 

  1147.     idx1_pos = avio_tell(pb);

  1148.     avio_seek(pb, avi->movi_list+4, SEEK_SET);

  1149.     if (avi_sync(s, 1) == 0) {

  1150.         first_packet_pos = avio_tell(pb) - 8;

  1151.     }

  1152.     avi->stream_index = -1;

  1153.     avio_seek(pb, idx1_pos, SEEK_SET);

  1154. 

  1155.     /* Read the entries and sort them in each stream component. */

  1156.     for(i = 0; i < nb_index_entries; i++) {

  1157.         tag = avio_rl32(pb);

  1158.         flags = avio_rl32(pb);

  1159.         pos = avio_rl32(pb);

  1160.         len = avio_rl32(pb);

  1161.         av_dlog(s, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",

  1162.                 i, tag, flags, pos, len);

  1163. 

  1164.         index = ((tag & 0xff) - '0') * 10;

  1165.         index += ((tag >> 8) & 0xff) - '0';

  1166.         if (index >= s->nb_streams)

  1167.             continue;

  1168.         st = s->streams[index];

  1169.         ast = st->priv_data;

  1170. 

  1171.         if(first_packet && first_packet_pos && len) {

  1172.             data_offset = first_packet_pos - pos;

  1173.             first_packet = 0;

  1174.         }

  1175.         pos += data_offset;

  1176. 

  1177.         av_dlog(s, "%d cum_len=%"PRId64"\n", len, ast->cum_len);

  1178. 

  1179.         if(pb->eof_reached)

  1180.             return -1;

  1181. 

  1182.         if(last_pos == pos)

  1183.             avi->non_interleaved= 1;

  1184.         else if(len || !ast->sample_size)

  1185.             av_add_index_entry(st, pos, ast->cum_len, len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);

  1186.         ast->cum_len += get_duration(ast, len);

  1187.         last_pos= pos;

  1188.     }

  1189.     return 0;

  1190. }

  1191. 

  1192. static int guess_ni_flag(AVFormatContext *s){

  1193.     int i;

  1194.     int64_t last_start=0;

  1195.     int64_t first_end= INT64_MAX;

  1196.     int64_t oldpos= avio_tell(s->pb);

  1197. 

  1198.     for(i=0; i<s->nb_streams; i++){

  1199.         AVStream *st = s->streams[i];

  1200.         int n= st->nb_index_entries;

  1201.         unsigned int size;

  1202. 

  1203.         if(n <= 0)

  1204.             continue;

  1205. 

  1206.         if(n >= 2){

  1207.             int64_t pos= st->index_entries[0].pos;

  1208.             avio_seek(s->pb, pos + 4, SEEK_SET);

  1209.             size= avio_rl32(s->pb);

  1210.             if(pos + size > st->index_entries[1].pos)

  1211.                 last_start= INT64_MAX;

  1212.         }

  1213. 

  1214.         if(st->index_entries[0].pos > last_start)

  1215.             last_start= st->index_entries[0].pos;

  1216.         if(st->index_entries[n-1].pos < first_end)

  1217.             first_end= st->index_entries[n-1].pos;

  1218.     }

  1219.     avio_seek(s->pb, oldpos, SEEK_SET);

  1220.     return last_start > first_end;

  1221. }

  1222. 

  1223. static int avi_load_index(AVFormatContext *s)

  1224. {

  1225.     AVIContext *avi = s->priv_data;

  1226.     AVIOContext *pb = s->pb;

  1227.     uint32_t tag, size;

  1228.     int64_t pos= avio_tell(pb);

  1229.     int ret = -1;

  1230. 

  1231.     if (avio_seek(pb, avi->movi_end, SEEK_SET) < 0)

  1232.         goto the_end; // maybe truncated file

  1233.     av_dlog(s, "movi_end=0x%"PRIx64"\n", avi->movi_end);

  1234.     for(;;) {

  1235.         if (pb->eof_reached)

  1236.             break;

  1237.         tag = avio_rl32(pb);

  1238.         size = avio_rl32(pb);

  1239.         av_dlog(s, "tag=%c%c%c%c size=0x%x\n",

  1240.                  tag        & 0xff,

  1241.                 (tag >>  8) & 0xff,

  1242.                 (tag >> 16) & 0xff,

  1243.                 (tag >> 24) & 0xff,

  1244.                 size);

  1245. 

  1246.         if (tag == MKTAG('i', 'd', 'x', '1') &&

  1247.             avi_read_idx1(s, size) >= 0) {

  1248.             ret = 0;

  1249.             break;

  1250.         }

  1251. 

  1252.         size += (size & 1);

  1253.         if (avio_skip(pb, size) < 0)

  1254.             break; // something is wrong here

  1255.     }

  1256.  the_end:

  1257.     avio_seek(pb, pos, SEEK_SET);

  1258.     return ret;

  1259. }

  1260. 

  1261. static void seek_subtitle(AVStream *st, AVStream *st2, int64_t timestamp)

  1262. {

  1263.     AVIStream *ast2 = st2->priv_data;

  1264.     int64_t ts2 = av_rescale_q(timestamp, st->time_base, st2->time_base);

  1265.     av_free_packet(&ast2->sub_pkt);

  1266.     if (avformat_seek_file(ast2->sub_ctx, 0, INT64_MIN, ts2, ts2, 0) >= 0 ||

  1267.         avformat_seek_file(ast2->sub_ctx, 0, ts2, ts2, INT64_MAX, 0) >= 0)

  1268.         av_read_packet(ast2->sub_ctx, &ast2->sub_pkt);

  1269. }

  1270. 

  1271. static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)

  1272. {

  1273.     AVIContext *avi = s->priv_data;

  1274.     AVStream *st;

  1275.     int i, index;

  1276.     int64_t pos;

  1277.     AVIStream *ast;

  1278. 

  1279.     if (!avi->index_loaded) {

  1280.         /* we only load the index on demand */

  1281.         avi_load_index(s);

  1282.         avi->index_loaded = 1;

  1283.     }

  1284.     assert(stream_index>= 0);

  1285. 

  1286.     st = s->streams[stream_index];

  1287.     ast= st->priv_data;

  1288.     index= av_index_search_timestamp(st, timestamp * FFMAX(ast->sample_size, 1), flags);

  1289.     if(index<0)

  1290.         return -1;

  1291. 

  1292.     /* find the position */

  1293.     pos = st->index_entries[index].pos;

  1294.     timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1);

  1295. 

  1296. //    av_log(s, AV_LOG_DEBUG, "XX %"PRId64" %d %"PRId64"\n", timestamp, index, st->index_entries[index].timestamp);

  1297. 

  1298.     if (CONFIG_DV_DEMUXER && avi->dv_demux) {

  1299.         /* One and only one real stream for DV in AVI, and it has video  */

  1300.         /* offsets. Calling with other stream indexes should have failed */

  1301.         /* the av_index_search_timestamp call above.                     */

  1302.         assert(stream_index == 0);

  1303. 

  1304.         /* Feed the DV video stream version of the timestamp to the */

  1305.         /* DV demux so it can synthesize correct timestamps.        */

  1306.         dv_offset_reset(avi->dv_demux, timestamp);

  1307. 

  1308.         avio_seek(s->pb, pos, SEEK_SET);

  1309.         avi->stream_index= -1;

  1310.         return 0;

  1311.     }

  1312. 

  1313.     for(i = 0; i < s->nb_streams; i++) {

  1314.         AVStream *st2 = s->streams[i];

  1315.         AVIStream *ast2 = st2->priv_data;

  1316. 

  1317.         ast2->packet_size=

  1318.         ast2->remaining= 0;

  1319. 

  1320.         if (ast2->sub_ctx) {

  1321.             seek_subtitle(st, st2, timestamp);

  1322.             continue;

  1323.         }

  1324. 

  1325.         if (st2->nb_index_entries <= 0)

  1326.             continue;

  1327. 

  1328. //        assert(st2->codec->block_align);

  1329.         assert((int64_t)st2->time_base.num*ast2->rate == (int64_t)st2->time_base.den*ast2->scale);

  1330.         index = av_index_search_timestamp(

  1331.                 st2,

  1332.                 av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),

  1333.                 flags | AVSEEK_FLAG_BACKWARD);

  1334.         if(index<0)

  1335.             index=0;

  1336. 

  1337.         if(!avi->non_interleaved){

  1338.             while(index>0 && st2->index_entries[index].pos > pos)

  1339.                 index--;

  1340.             while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos)

  1341.                 index++;

  1342.         }

  1343. 

  1344. //        av_log(s, AV_LOG_DEBUG, "%"PRId64" %d %"PRId64"\n", timestamp, index, st2->index_entries[index].timestamp);

  1345.         /* extract the current frame number */

  1346.         ast2->frame_offset = st2->index_entries[index].timestamp;

  1347.     }

  1348. 

  1349.     /* do the seek */

  1350.     avio_seek(s->pb, pos, SEEK_SET);

  1351.     avi->stream_index= -1;

  1352.     return 0;

  1353. }

  1354. 

  1355. static int avi_read_close(AVFormatContext *s)

  1356. {

  1357.     int i;

  1358.     AVIContext *avi = s->priv_data;

  1359. 

  1360.     for(i=0;i<s->nb_streams;i++) {

  1361.         AVStream *st = s->streams[i];

  1362.         AVIStream *ast = st->priv_data;

  1363.         if (ast) {

  1364.             if (ast->sub_ctx) {

  1365.                 av_freep(&ast->sub_ctx->pb);

  1366.                 av_close_input_file(ast->sub_ctx);

  1367.             }

  1368.             av_free(ast->sub_buffer);

  1369.             av_free_packet(&ast->sub_pkt);

  1370.         }

  1371.     }

  1372. 

  1373.     av_free(avi->dv_demux);

  1374. 

  1375.     return 0;

  1376. }

  1377. 

  1378. static int avi_probe(AVProbeData *p)

  1379. {

  1380.     int i;

  1381. 

  1382.     /* check file header */

  1383.     for(i=0; avi_headers[i][0]; i++)

  1384.         if(!memcmp(p->buf  , avi_headers[i]  , 4) &&

  1385.            !memcmp(p->buf+8, avi_headers[i]+4, 4))

  1386.             return AVPROBE_SCORE_MAX;

  1387. 

  1388.     return 0;

  1389. }

  1390. 

  1391. AVInputFormat ff_avi_demuxer = {

  1392.     "avi",

  1393.     NULL_IF_CONFIG_SMALL("AVI format"),

  1394.     sizeof(AVIContext),

  1395.     avi_probe,

  1396.     avi_read_header,

  1397.     avi_read_packet,

  1398.     avi_read_close,

  1399.     avi_read_seek,

  1400. };