falkTX
/
FFmpeg
mirror of https://github.com/falkTX/FFmpeg.git
1
0
Fork 0
Code Issues 0 Releases 338 Wiki Activity
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
29246 Commits
32 Branches
436MB
Tree: 8c94eab011
Branches Tags
${ item.name }
Create branch ${ searchTerm }
from '8c94eab011'
${ noResults }
FFmpeg/libavformat/avidec.c

1400 lines
47KB
Raw Blame History 

  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/bswap.h"

  25. #include "libavutil/dict.h"

  26. #include "avformat.h"

  27. #include "avi.h"

  28. #include "dv.h"

  29. #include "riff.h"

  30. 

  31. #undef NDEBUG

  32. #include <assert.h>

  33. 

  34. typedef struct AVIStream {

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

  36.                          (used to compute the pts) */

  37.     int remaining;

  38.     int packet_size;

  39. 

  40.     int scale;

  41.     int rate;

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

  43. 

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

  45. 

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

  47.     int prefix_count;

  48.     uint32_t pal[256];

  49.     int has_pal;

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

  51. 

  52.     AVFormatContext *sub_ctx;

  53.     AVPacket sub_pkt;

  54.     uint8_t *sub_buffer;

  55. } AVIStream;

  56. 

  57. typedef struct {

  58.     int64_t  riff_end;

  59.     int64_t  movi_end;

  60.     int64_t  fsize;

  61.     int64_t movi_list;

  62.     int64_t last_pkt_pos;

  63.     int index_loaded;

  64.     int is_odml;

  65.     int non_interleaved;

  66.     int stream_index;

  67.     DVDemuxContext* dv_demux;

  68.     int odml_depth;

  69. #define MAX_ODML_DEPTH 1000

  70. } AVIContext;

  71. 

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

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

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

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

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

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

  78.     { 0 }

  79. };

  80. 

  81. static int avi_load_index(AVFormatContext *s);

  82. static int guess_ni_flag(AVFormatContext *s);

  83. 

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

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

  86.            str, tag & 0xff,                             \

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

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

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

  90.            size)

  91. 

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

  93.     if(ast->sample_size){

  94.         return len;

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

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

  97.     }else

  98.         return 1;

  99. }

  100. 

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

  102. {

  103.     AVIContext *avi = s->priv_data;

  104.     char header[8];

  105.     int i;

  106. 

  107.     /* check RIFF header */

  108.     avio_read(pb, header, 4);

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

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

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

  112. 

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

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

  115.             break;

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

  117.         return -1;

  118. 

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

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

  121. 

  122.     return 0;

  123. }

  124. 

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

  126.     AVIContext *avi = s->priv_data;

  127.     AVIOContext *pb = s->pb;

  128.     int longs_pre_entry= avio_rl16(pb);

  129.     int index_sub_type = avio_r8(pb);

  130.     int index_type     = avio_r8(pb);

  131.     int entries_in_use = avio_rl32(pb);

  132.     int chunk_id       = avio_rl32(pb);

  133.     int64_t base       = avio_rl64(pb);

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

  135.     AVStream *st;

  136.     AVIStream *ast;

  137.     int i;

  138.     int64_t last_pos= -1;

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

  140. 

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

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

  143. 

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

  145.         return -1;

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

  147.     ast = st->priv_data;

  148. 

  149.     if(index_sub_type)

  150.         return -1;

  151. 

  152.     avio_rl32(pb);

  153. 

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

  155.         return -1;

  156.     if(index_type>1)

  157.         return -1;

  158. 

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

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

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

  162.             base &= 0xFFFFFFFF;

  163.         else

  164.             return -1;

  165.     }

  166. 

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

  168.         if(index_type){

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

  170.             int len    = avio_rl32(pb);

  171.             int key= len >= 0;

  172.             len &= 0x7FFFFFFF;

  173. 

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

  175. 

  176.             if(pb->eof_reached)

  177.                 return -1;

  178. 

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

  180.                 avi->non_interleaved= 1;

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

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

  183. 

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

  185.             last_pos= pos;

  186.         }else{

  187.             int64_t offset, pos;

  188.             int duration;

  189.             offset = avio_rl64(pb);

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

  191.             duration = avio_rl32(pb);

  192. 

  193.             if(pb->eof_reached)

  194.                 return -1;

  195. 

  196.             pos = avio_tell(pb);

  197. 

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

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

  200.                 return -1;

  201.             }

  202. 

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

  204.             avi->odml_depth++;

  205.             read_braindead_odml_indx(s, frame_num);

  206.             avi->odml_depth--;

  207.             frame_num += duration;

  208. 

  209.             avio_seek(pb, pos, SEEK_SET);

  210.         }

  211.     }

  212.     avi->index_loaded=1;

  213.     return 0;

  214. }

  215. 

  216. static void clean_index(AVFormatContext *s){

  217.     int i;

  218.     int64_t j;

  219. 

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

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

  222.         AVIStream *ast = st->priv_data;

  223.         int n= st->nb_index_entries;

  224.         int max= ast->sample_size;

  225.         int64_t pos, size, ts;

  226. 

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

  228.             continue;

  229. 

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

  231. 

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

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

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

  235. 

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

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

  238.         }

  239.     }

  240. }

  241. 

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

  243. {

  244.     AVIOContext *pb = s->pb;

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

  246. 

  247.     size += (size & 1);

  248. 

  249.     if (size == UINT_MAX)

  250.         return -1;

  251.     value = av_malloc(size+1);

  252.     if (!value)

  253.         return -1;

  254.     avio_read(pb, value, size);

  255.     value[size]=0;

  256. 

  257.     AV_WL32(key, tag);

  258. 

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

  260.                             AV_DICT_DONT_STRDUP_VAL);

  261. }

  262. 

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

  264. {

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

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

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

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

  269.     }

  270. }

  271. 

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

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

  274. 

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

  276. {

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

  278.     int i, day, year;

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

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

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

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

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

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

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

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

  287.             }

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

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

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

  291.     }

  292. }

  293. 

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

  295. {

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

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

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

  299.         switch (tag) {

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

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

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

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

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

  305.                 const char *name = NULL;

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

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

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

  309.                 switch (tag) {

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

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

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

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

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

  315.                     break;

  316.                 }

  317.                 if (name)

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

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

  320.             }

  321.             break;

  322.         }

  323.         default:

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

  325.             break;

  326.         }

  327.     }

  328. }

  329. 

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

  331. {

  332.     AVIContext *avi = s->priv_data;

  333.     AVIOContext *pb = s->pb;

  334.     unsigned int tag, tag1, handler;

  335.     int codec_type, stream_index, frame_period;

  336.     unsigned int size;

  337.     int i;

  338.     AVStream *st;

  339.     AVIStream *ast = NULL;

  340.     int avih_width=0, avih_height=0;

  341.     int amv_file_format=0;

  342.     uint64_t list_end = 0;

  343.     int ret;

  344. 

  345.     avi->stream_index= -1;

  346. 

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

  348.         return -1;

  349. 

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

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

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

  353. 

  354.     /* first list tag */

  355.     stream_index = -1;

  356.     codec_type = -1;

  357.     frame_period = 0;

  358.     for(;;) {

  359.         if (pb->eof_reached)

  360.             goto fail;

  361.         tag = avio_rl32(pb);

  362.         size = avio_rl32(pb);

  363. 

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

  365. 

  366.         switch(tag) {

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

  368.             list_end = avio_tell(pb) + size;

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

  370.             tag1 = avio_rl32(pb);

  371. 

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

  373. 

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

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

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

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

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

  379.                 goto end_of_header;

  380.             }

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

  382.                 avi_read_info(s, list_end);

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

  384.                 avi_read_nikon(s, list_end);

  385. 

  386.             break;

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

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

  389.             size += (size & 1);

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

  391.             avio_skip(pb, size);

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

  393.             break;

  394.         }

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

  396.             avi->is_odml = 1;

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

  398.             break;

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

  400.             amv_file_format=1;

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

  402.             /* AVI header */

  403.             /* using frame_period is bad idea */

  404.             frame_period = avio_rl32(pb);

  405.             avio_skip(pb, 4);

  406.             avio_rl32(pb);

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

  408. 

  409.             avio_skip(pb, 2 * 4);

  410.             avio_rl32(pb);

  411.             avio_rl32(pb);

  412.             avih_width=avio_rl32(pb);

  413.             avih_height=avio_rl32(pb);

  414. 

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

  416.             break;

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

  418.             /* stream header */

  419. 

  420.             tag1 = avio_rl32(pb);

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

  422. 

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

  424.                 avio_skip(pb, size - 8);

  425.                 break;

  426.             }else{

  427.                 stream_index++;

  428.                 st = av_new_stream(s, stream_index);

  429.                 if (!st)

  430.                     goto fail;

  431. 

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

  433.                 if (!ast)

  434.                     goto fail;

  435.                 st->priv_data = ast;

  436.             }

  437.             if(amv_file_format)

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

  439. 

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

  441. 

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

  443.                 int64_t dv_dur;

  444. 

  445.                 /*

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

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

  448.                  */

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

  450.                     goto fail;

  451. 

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

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

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

  455.                    goto fail;

  456. 

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

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

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

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

  461.                 s->nb_streams = 0;

  462.                 if (CONFIG_DV_DEMUXER) {

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

  464.                     if (!avi->dv_demux)

  465.                         goto fail;

  466.                 }

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

  468.                 avio_skip(pb, 3 * 4);

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

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

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

  472. 

  473.                 dv_dur = avio_rl32(pb);

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

  475.                     dv_dur *= AV_TIME_BASE;

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

  477.                 }

  478.                 /*

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

  480.                  *      will make a guess based on bitrate.

  481.                  */

  482. 

  483.                 stream_index = s->nb_streams - 1;

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

  485.                 break;

  486.             }

  487. 

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

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

  490. 

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

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

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

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

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

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

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

  498.                 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);

  499.                 if(frame_period){

  500.                     ast->rate = 1000000;

  501.                     ast->scale = frame_period;

  502.                 }else{

  503.                     ast->rate = 25;

  504.                     ast->scale = 1;

  505.                 }

  506.             }

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

  508. 

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

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

  511. 

  512.             st->start_time = 0;

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

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

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

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

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

  518. 

  519.             switch(tag1) {

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

  521.                 codec_type = AVMEDIA_TYPE_VIDEO;

  522. 

  523.                 ast->sample_size = 0;

  524.                 break;

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

  526.                 codec_type = AVMEDIA_TYPE_AUDIO;

  527.                 break;

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

  529.                 codec_type = AVMEDIA_TYPE_SUBTITLE;

  530.                 break;

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

  532.                 codec_type = AVMEDIA_TYPE_DATA;

  533.                 break;

  534.             default:

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

  536.                 goto fail;

  537.             }

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

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

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

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

  542.             break;

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

  544.             /* stream header */

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

  546.                 avio_skip(pb, size);

  547.             } else {

  548.                 uint64_t cur_pos = avio_tell(pb);

  549.                 if (cur_pos < list_end)

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

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

  552.                 switch(codec_type) {

  553.                 case AVMEDIA_TYPE_VIDEO:

  554.                     if(amv_file_format){

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

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

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

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

  559.                         avio_skip(pb, size);

  560.                         break;

  561.                     }

  562.                     tag1 = ff_get_bmp_header(pb, st);

  563. 

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

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

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

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

  568.                         break;

  569.                     }

  570. 

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

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

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

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

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

  576.                             return AVERROR(ENOMEM);

  577.                         }

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

  579.                     }

  580. 

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

  582.                         avio_r8(pb);

  583. 

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

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

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

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

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

  589.                         const uint8_t *pal_src;

  590. 

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

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

  593. #if HAVE_BIGENDIAN

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

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

  596. #else

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

  598. #endif

  599.                         ast->has_pal = 1;

  600.                     }

  601. 

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

  603. 

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

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

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

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

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

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

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

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

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

  613. 

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

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

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

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

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

  619.                     }

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

  621. 

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

  623.                     break;

  624.                 case AVMEDIA_TYPE_AUDIO:

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

  626.                     if (ret < 0)

  627.                         return ret;

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

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

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

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

  632.                     }

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

  634.                         avio_skip(pb, 1);

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

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

  637.                     st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;

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

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

  640.                      * fail. */

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

  642.                         st->need_parsing = AVSTREAM_PARSE_NONE;

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

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

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

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

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

  648.                     }

  649.                     if (amv_file_format){

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

  651.                         ast->dshow_block_align = 0;

  652.                     }

  653.                     break;

  654.                 case AVMEDIA_TYPE_SUBTITLE:

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

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

  657.                     break;

  658.                 default:

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

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

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

  662.                     avio_skip(pb, size);

  663.                     break;

  664.                 }

  665.             }

  666.             break;

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

  668.             i= avio_tell(pb);

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

  670.                 read_braindead_odml_indx(s, 0);

  671.             }

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

  673.             break;

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

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

  676.                 AVRational active, active_aspect;

  677. 

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

  679.                 avio_rl32(pb);

  680.                 avio_rl32(pb);

  681.                 avio_rl32(pb);

  682.                 avio_rl32(pb);

  683.                 avio_rl32(pb);

  684. 

  685.                 active_aspect.den= avio_rl16(pb);

  686.                 active_aspect.num= avio_rl16(pb);

  687.                 active.num       = avio_rl32(pb);

  688.                 active.den       = avio_rl32(pb);

  689.                 avio_rl32(pb); //nbFieldsPerFrame

  690. 

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

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

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

  694.                 }

  695.                 size -= 9*4;

  696.             }

  697.             avio_skip(pb, size);

  698.             break;

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

  700.             if(s->nb_streams){

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

  702.                 break;

  703.             }

  704.         default:

  705.             if(size > 1000000){

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

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

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

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

  710.                 goto end_of_header;

  711.             }

  712.             /* skip tag */

  713.             size += (size & 1);

  714.             avio_skip(pb, size);

  715.             break;

  716.         }

  717.     }

  718.  end_of_header:

  719.     /* check stream number */

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

  721.     fail:

  722.         return -1;

  723.     }

  724. 

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

  726.         avi_load_index(s);

  727.     avi->index_loaded = 1;

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

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

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

  731.         if(st->nb_index_entries)

  732.             break;

  733.     }

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

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

  736.         avi->non_interleaved=0;

  737.     }

  738. 

  739.     if(avi->non_interleaved) {

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

  741.         clean_index(s);

  742.     }

  743. 

  744.     ff_metadata_conv_ctx(s, NULL, ff_avi_metadata_conv);

  745. 

  746.     return 0;

  747. }

  748. 

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

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

  751.         uint8_t desc[256];

  752.         int score = AVPROBE_SCORE_MAX / 2, ret;

  753.         AVIStream *ast = st->priv_data;

  754.         AVInputFormat *sub_demuxer;

  755.         AVRational time_base;

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

  757.                                               pkt->size - 7,

  758.                                               0, NULL, NULL, NULL, NULL);

  759.         AVProbeData pd;

  760.         unsigned int desc_len = avio_rl32(pb);

  761. 

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

  763.             goto error;

  764. 

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

  766.         avio_skip(pb, desc_len - ret);

  767.         if (*desc)

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

  769. 

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

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

  772. 

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

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

  775.             goto error;

  776. 

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

  778.             goto error;

  779. 

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

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

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

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

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

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

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

  787.         }

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

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

  790.         return 1;

  791. error:

  792.         av_freep(&pb);

  793.     }

  794.     return 0;

  795. }

  796. 

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

  798.                                   AVPacket *pkt)

  799. {

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

  801.     int64_t ts, next_ts, ts_min = INT64_MAX;

  802.     AVStream *st, *sub_st = NULL;

  803.     int i;

  804. 

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

  806.                            AV_TIME_BASE_Q);

  807. 

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

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

  810.         ast = st->priv_data;

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

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

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

  814.                 ts_min = ts;

  815.                 sub_st = st;

  816.             }

  817.         }

  818.     }

  819. 

  820.     if (sub_st) {

  821.         ast = sub_st->priv_data;

  822.         *pkt = ast->sub_pkt;

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

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

  825.             ast->sub_pkt.data = NULL;

  826.     }

  827.     return sub_st;

  828. }

  829. 

  830. static int get_stream_idx(int *d){

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

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

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

  834.     }else{

  835.         return 100; //invalid stream ID

  836.     }

  837. }

  838. 

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

  840. {

  841.     AVIContext *avi = s->priv_data;

  842.     AVIOContext *pb = s->pb;

  843.     int n, d[8];

  844.     unsigned int size;

  845.     int64_t i, sync;

  846. 

  847. start_sync:

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

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

  850.         int j;

  851. 

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

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

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

  855. 

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

  857. 

  858.         n= get_stream_idx(d+2);

  859. //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);

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

  861.             continue;

  862. 

  863.         //parse ix##

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

  865.         //parse JUNK

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

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

  868.             avio_skip(pb, size);

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

  870.             goto start_sync;

  871.         }

  872. 

  873.         //parse stray LIST

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

  875.             avio_skip(pb, 4);

  876.             goto start_sync;

  877.         }

  878. 

  879.         n= get_stream_idx(d);

  880. 

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

  882.             continue;

  883. 

  884.         //detect ##ix chunk and skip

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

  886.             avio_skip(pb, size);

  887.             goto start_sync;

  888.         }

  889. 

  890.         //parse ##dc/##wb

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

  892.             AVStream *st;

  893.             AVIStream *ast;

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

  895.             ast = st->priv_data;

  896. 

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

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

  899.                 AVIStream *ast1= st1->priv_data;

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

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

  902.                    && n==0

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

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

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

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

  907.                   ){

  908.                     n=1;

  909.                     st = st1;

  910.                     ast = ast1;

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

  912.                 }

  913.             }

  914. 

  915. 

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

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

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

  919.                 if (!exit_early) {

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

  921.                 }

  922.                 avio_skip(pb, size);

  923.                 goto start_sync;

  924.             }

  925. 

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

  927.                 int k = avio_r8(pb);

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

  929. 

  930.                 avio_rl16(pb); //flags

  931. 

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

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

  934.                 ast->has_pal= 1;

  935.                 goto start_sync;

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

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

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

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

  940. 

  941.                 if (exit_early)

  942.                     return 0;

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

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

  945.                     ast->prefix_count++;

  946.                 else{

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

  948.                     ast->prefix_count= 0;

  949.                 }

  950. 

  951.                 avi->stream_index= n;

  952.                 ast->packet_size= size + 8;

  953.                 ast->remaining= size;

  954. 

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

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

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

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

  959.                     }

  960.                 }

  961.                 return 0;

  962.             }

  963.         }

  964.     }

  965. 

  966.     return AVERROR_EOF;

  967. }

  968. 

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

  970. {

  971.     AVIContext *avi = s->priv_data;

  972.     AVIOContext *pb = s->pb;

  973.     int err;

  974.     void* dstr;

  975. 

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

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

  978.         if (size >= 0)

  979.             return size;

  980.     }

  981. 

  982.     if(avi->non_interleaved){

  983.         int best_stream_index = 0;

  984.         AVStream *best_st= NULL;

  985.         AVIStream *best_ast;

  986.         int64_t best_ts= INT64_MAX;

  987.         int i;

  988. 

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

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

  991.             AVIStream *ast = st->priv_data;

  992.             int64_t ts= ast->frame_offset;

  993.             int64_t last_ts;

  994. 

  995.             if(!st->nb_index_entries)

  996.                 continue;

  997. 

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

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

  1000.                 continue;

  1001. 

  1002.             ts = av_rescale_q(ts, st->time_base, (AVRational){FFMAX(1, ast->sample_size), AV_TIME_BASE});

  1003. 

  1004. //            av_log(s, AV_LOG_DEBUG, "%"PRId64" %d/%d %"PRId64"\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);

  1005.             if(ts < best_ts){

  1006.                 best_ts= ts;

  1007.                 best_st= st;

  1008.                 best_stream_index= i;

  1009.             }

  1010.         }

  1011.         if(!best_st)

  1012.             return -1;

  1013. 

  1014.         best_ast = best_st->priv_data;

  1015.         best_ts = av_rescale_q(best_ts, (AVRational){FFMAX(1, best_ast->sample_size), AV_TIME_BASE}, best_st->time_base);

  1016.         if(best_ast->remaining)

  1017.             i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);

  1018.         else{

  1019.             i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);

  1020.             if(i>=0)

  1021.                 best_ast->frame_offset= best_st->index_entries[i].timestamp;

  1022.         }

  1023. 

  1024. //        av_log(s, AV_LOG_DEBUG, "%d\n", i);

  1025.         if(i>=0){

  1026.             int64_t pos= best_st->index_entries[i].pos;

  1027.             pos += best_ast->packet_size - best_ast->remaining;

  1028.             avio_seek(s->pb, pos + 8, SEEK_SET);

  1029. //        av_log(s, AV_LOG_DEBUG, "pos=%"PRId64"\n", pos);

  1030. 

  1031.             assert(best_ast->remaining <= best_ast->packet_size);

  1032. 

  1033.             avi->stream_index= best_stream_index;

  1034.             if(!best_ast->remaining)

  1035.                 best_ast->packet_size=

  1036.                 best_ast->remaining= best_st->index_entries[i].size;

  1037.         }

  1038.     }

  1039. 

  1040. resync:

  1041.     if(avi->stream_index >= 0){

  1042.         AVStream *st= s->streams[ avi->stream_index ];

  1043.         AVIStream *ast= st->priv_data;

  1044.         int size, err;

  1045. 

  1046.         if(get_subtitle_pkt(s, st, pkt))

  1047.             return 0;

  1048. 

  1049.         if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM

  1050.             size= INT_MAX;

  1051.         else if(ast->sample_size < 32)

  1052.             // arbitrary multiplier to avoid tiny packets for raw PCM data

  1053.             size= 1024*ast->sample_size;

  1054.         else

  1055.             size= ast->sample_size;

  1056. 

  1057.         if(size > ast->remaining)

  1058.             size= ast->remaining;

  1059.         avi->last_pkt_pos= avio_tell(pb);

  1060.         err= av_get_packet(pb, pkt, size);

  1061.         if(err<0)

  1062.             return err;

  1063. 

  1064.         if(ast->has_pal && pkt->data && pkt->size<(unsigned)INT_MAX/2){

  1065.             uint8_t *pal;

  1066.             pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, AVPALETTE_SIZE);

  1067.             if(!pal){

  1068.                 av_log(s, AV_LOG_ERROR, "Failed to allocate data for palette\n");

  1069.             }else{

  1070.                 memcpy(pal, ast->pal, AVPALETTE_SIZE);

  1071.                 ast->has_pal = 0;

  1072.             }

  1073.         }

  1074. 

  1075.         if (CONFIG_DV_DEMUXER && avi->dv_demux) {

  1076.             dstr = pkt->destruct;

  1077.             size = dv_produce_packet(avi->dv_demux, pkt,

  1078.                                     pkt->data, pkt->size);

  1079.             pkt->destruct = dstr;

  1080.             pkt->flags |= AV_PKT_FLAG_KEY;

  1081.             if (size < 0)

  1082.                 av_free_packet(pkt);

  1083.         } else if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE

  1084.                    && !st->codec->codec_tag && read_gab2_sub(st, pkt)) {

  1085.             ast->frame_offset++;

  1086.             avi->stream_index = -1;

  1087.             ast->remaining = 0;

  1088.             goto resync;

  1089.         } else {

  1090.             /* XXX: How to handle B-frames in AVI? */

  1091.             pkt->dts = ast->frame_offset;

  1092. //                pkt->dts += ast->start;

  1093.             if(ast->sample_size)

  1094.                 pkt->dts /= ast->sample_size;

  1095. //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);

  1096.             pkt->stream_index = avi->stream_index;

  1097. 

  1098.             if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {

  1099.                 AVIndexEntry *e;

  1100.                 int index;

  1101.                 assert(st->index_entries);

  1102. 

  1103.                 index= av_index_search_timestamp(st, ast->frame_offset, 0);

  1104.                 e= &st->index_entries[index];

  1105. 

  1106.                 if(index >= 0 && e->timestamp == ast->frame_offset){

  1107.                     if (e->flags & AVINDEX_KEYFRAME)

  1108.                         pkt->flags |= AV_PKT_FLAG_KEY;

  1109.                 }

  1110.             } else {

  1111.                 pkt->flags |= AV_PKT_FLAG_KEY;

  1112.             }

  1113.             ast->frame_offset += get_duration(ast, pkt->size);

  1114.         }

  1115.         ast->remaining -= size;

  1116.         if(!ast->remaining){

  1117.             avi->stream_index= -1;

  1118.             ast->packet_size= 0;

  1119.         }

  1120. 

  1121.         return size;

  1122.     }

  1123. 

  1124.     if ((err = avi_sync(s, 0)) < 0)

  1125.         return err;

  1126.     goto resync;

  1127. }

  1128. 

  1129. /* XXX: We make the implicit supposition that the positions are sorted

  1130.    for each stream. */

  1131. static int avi_read_idx1(AVFormatContext *s, int size)

  1132. {

  1133.     AVIContext *avi = s->priv_data;

  1134.     AVIOContext *pb = s->pb;

  1135.     int nb_index_entries, i;

  1136.     AVStream *st;

  1137.     AVIStream *ast;

  1138.     unsigned int index, tag, flags, pos, len, first_packet = 1;

  1139.     unsigned last_pos= -1;

  1140.     int64_t idx1_pos, first_packet_pos = 0, data_offset = 0;

  1141. 

  1142.     nb_index_entries = size / 16;

  1143.     if (nb_index_entries <= 0)

  1144.         return -1;

  1145. 

  1146.     idx1_pos = avio_tell(pb);

  1147.     avio_seek(pb, avi->movi_list+4, SEEK_SET);

  1148.     if (avi_sync(s, 1) == 0) {

  1149.         first_packet_pos = avio_tell(pb) - 8;

  1150.     }

  1151.     avi->stream_index = -1;

  1152.     avio_seek(pb, idx1_pos, SEEK_SET);

  1153. 

  1154.     /* Read the entries and sort them in each stream component. */

  1155.     for(i = 0; i < nb_index_entries; i++) {

  1156.         tag = avio_rl32(pb);

  1157.         flags = avio_rl32(pb);

  1158.         pos = avio_rl32(pb);

  1159.         len = avio_rl32(pb);

  1160.         av_dlog(s, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",

  1161.                 i, tag, flags, pos, len);

  1162. 

  1163.         index = ((tag & 0xff) - '0') * 10;

  1164.         index += ((tag >> 8) & 0xff) - '0';

  1165.         if (index >= s->nb_streams)

  1166.             continue;

  1167.         st = s->streams[index];

  1168.         ast = st->priv_data;

  1169. 

  1170.         if(first_packet && first_packet_pos && len) {

  1171.             data_offset = first_packet_pos - pos;

  1172.             first_packet = 0;

  1173.         }

  1174.         pos += data_offset;

  1175. 

  1176.         av_dlog(s, "%d cum_len=%"PRId64"\n", len, ast->cum_len);

  1177. 

  1178.         if(pb->eof_reached)

  1179.             return -1;

  1180. 

  1181.         if(last_pos == pos)

  1182.             avi->non_interleaved= 1;

  1183.         else if(len || !ast->sample_size)

  1184.             av_add_index_entry(st, pos, ast->cum_len, len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);

  1185.         ast->cum_len += get_duration(ast, len);

  1186.         last_pos= pos;

  1187.     }

  1188.     return 0;

  1189. }

  1190. 

  1191. static int guess_ni_flag(AVFormatContext *s){

  1192.     int i;

  1193.     int64_t last_start=0;

  1194.     int64_t first_end= INT64_MAX;

  1195.     int64_t oldpos= avio_tell(s->pb);

  1196. 

  1197.     for(i=0; i<s->nb_streams; i++){

  1198.         AVStream *st = s->streams[i];

  1199.         int n= st->nb_index_entries;

  1200.         unsigned int size;

  1201. 

  1202.         if(n <= 0)

  1203.             continue;

  1204. 

  1205.         if(n >= 2){

  1206.             int64_t pos= st->index_entries[0].pos;

  1207.             avio_seek(s->pb, pos + 4, SEEK_SET);

  1208.             size= avio_rl32(s->pb);

  1209.             if(pos + size > st->index_entries[1].pos)

  1210.                 last_start= INT64_MAX;

  1211.         }

  1212. 

  1213.         if(st->index_entries[0].pos > last_start)

  1214.             last_start= st->index_entries[0].pos;

  1215.         if(st->index_entries[n-1].pos < first_end)

  1216.             first_end= st->index_entries[n-1].pos;

  1217.     }

  1218.     avio_seek(s->pb, oldpos, SEEK_SET);

  1219.     return last_start > first_end;

  1220. }

  1221. 

  1222. static int avi_load_index(AVFormatContext *s)

  1223. {

  1224.     AVIContext *avi = s->priv_data;

  1225.     AVIOContext *pb = s->pb;

  1226.     uint32_t tag, size;

  1227.     int64_t pos= avio_tell(pb);

  1228.     int ret = -1;

  1229. 

  1230.     if (avio_seek(pb, avi->movi_end, SEEK_SET) < 0)

  1231.         goto the_end; // maybe truncated file

  1232.     av_dlog(s, "movi_end=0x%"PRIx64"\n", avi->movi_end);

  1233.     for(;;) {

  1234.         if (pb->eof_reached)

  1235.             break;

  1236.         tag = avio_rl32(pb);

  1237.         size = avio_rl32(pb);

  1238.         av_dlog(s, "tag=%c%c%c%c size=0x%x\n",

  1239.                  tag        & 0xff,

  1240.                 (tag >>  8) & 0xff,

  1241.                 (tag >> 16) & 0xff,

  1242.                 (tag >> 24) & 0xff,

  1243.                 size);

  1244. 

  1245.         if (tag == MKTAG('i', 'd', 'x', '1') &&

  1246.             avi_read_idx1(s, size) >= 0) {

  1247.             ret = 0;

  1248.             break;

  1249.         }

  1250. 

  1251.         size += (size & 1);

  1252.         if (avio_skip(pb, size) < 0)

  1253.             break; // something is wrong here

  1254.     }

  1255.  the_end:

  1256.     avio_seek(pb, pos, SEEK_SET);

  1257.     return ret;

  1258. }

  1259. 

  1260. static void seek_subtitle(AVStream *st, AVStream *st2, int64_t timestamp)

  1261. {

  1262.     AVIStream *ast2 = st2->priv_data;

  1263.     int64_t ts2 = av_rescale_q(timestamp, st->time_base, st2->time_base);

  1264.     av_free_packet(&ast2->sub_pkt);

  1265.     if (avformat_seek_file(ast2->sub_ctx, 0, INT64_MIN, ts2, ts2, 0) >= 0 ||

  1266.         avformat_seek_file(ast2->sub_ctx, 0, ts2, ts2, INT64_MAX, 0) >= 0)

  1267.         av_read_packet(ast2->sub_ctx, &ast2->sub_pkt);

  1268. }

  1269. 

  1270. static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)

  1271. {

  1272.     AVIContext *avi = s->priv_data;

  1273.     AVStream *st;

  1274.     int i, index;

  1275.     int64_t pos;

  1276.     AVIStream *ast;

  1277. 

  1278.     if (!avi->index_loaded) {

  1279.         /* we only load the index on demand */

  1280.         avi_load_index(s);

  1281.         avi->index_loaded = 1;

  1282.     }

  1283.     assert(stream_index>= 0);

  1284. 

  1285.     st = s->streams[stream_index];

  1286.     ast= st->priv_data;

  1287.     index= av_index_search_timestamp(st, timestamp * FFMAX(ast->sample_size, 1), flags);

  1288.     if(index<0)

  1289.         return -1;

  1290. 

  1291.     /* find the position */

  1292.     pos = st->index_entries[index].pos;

  1293.     timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1);

  1294. 

  1295. //    av_log(s, AV_LOG_DEBUG, "XX %"PRId64" %d %"PRId64"\n", timestamp, index, st->index_entries[index].timestamp);

  1296. 

  1297.     if (CONFIG_DV_DEMUXER && avi->dv_demux) {

  1298.         /* One and only one real stream for DV in AVI, and it has video  */

  1299.         /* offsets. Calling with other stream indexes should have failed */

  1300.         /* the av_index_search_timestamp call above.                     */

  1301.         assert(stream_index == 0);

  1302. 

  1303.         /* Feed the DV video stream version of the timestamp to the */

  1304.         /* DV demux so it can synthesize correct timestamps.        */

  1305.         dv_offset_reset(avi->dv_demux, timestamp);

  1306. 

  1307.         avio_seek(s->pb, pos, SEEK_SET);

  1308.         avi->stream_index= -1;

  1309.         return 0;

  1310.     }

  1311. 

  1312.     for(i = 0; i < s->nb_streams; i++) {

  1313.         AVStream *st2 = s->streams[i];

  1314.         AVIStream *ast2 = st2->priv_data;

  1315. 

  1316.         ast2->packet_size=

  1317.         ast2->remaining= 0;

  1318. 

  1319.         if (ast2->sub_ctx) {

  1320.             seek_subtitle(st, st2, timestamp);

  1321.             continue;

  1322.         }

  1323. 

  1324.         if (st2->nb_index_entries <= 0)

  1325.             continue;

  1326. 

  1327. //        assert(st2->codec->block_align);

  1328.         assert((int64_t)st2->time_base.num*ast2->rate == (int64_t)st2->time_base.den*ast2->scale);

  1329.         index = av_index_search_timestamp(

  1330.                 st2,

  1331.                 av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),

  1332.                 flags | AVSEEK_FLAG_BACKWARD);

  1333.         if(index<0)

  1334.             index=0;

  1335. 

  1336.         if(!avi->non_interleaved){

  1337.             while(index>0 && st2->index_entries[index].pos > pos)

  1338.                 index--;

  1339.             while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos)

  1340.                 index++;

  1341.         }

  1342. 

  1343. //        av_log(s, AV_LOG_DEBUG, "%"PRId64" %d %"PRId64"\n", timestamp, index, st2->index_entries[index].timestamp);

  1344.         /* extract the current frame number */

  1345.         ast2->frame_offset = st2->index_entries[index].timestamp;

  1346.     }

  1347. 

  1348.     /* do the seek */

  1349.     avio_seek(s->pb, pos, SEEK_SET);

  1350.     avi->stream_index= -1;

  1351.     return 0;

  1352. }

  1353. 

  1354. static int avi_read_close(AVFormatContext *s)

  1355. {

  1356.     int i;

  1357.     AVIContext *avi = s->priv_data;

  1358. 

  1359.     for(i=0;i<s->nb_streams;i++) {

  1360.         AVStream *st = s->streams[i];

  1361.         AVIStream *ast = st->priv_data;

  1362.         if (ast) {

  1363.             if (ast->sub_ctx) {

  1364.                 av_freep(&ast->sub_ctx->pb);

  1365.                 av_close_input_file(ast->sub_ctx);

  1366.             }

  1367.             av_free(ast->sub_buffer);

  1368.             av_free_packet(&ast->sub_pkt);

  1369.         }

  1370.     }

  1371. 

  1372.     av_free(avi->dv_demux);

  1373. 

  1374.     return 0;

  1375. }

  1376. 

  1377. static int avi_probe(AVProbeData *p)

  1378. {

  1379.     int i;

  1380. 

  1381.     /* check file header */

  1382.     for(i=0; avi_headers[i][0]; i++)

  1383.         if(!memcmp(p->buf  , avi_headers[i]  , 4) &&

  1384.            !memcmp(p->buf+8, avi_headers[i]+4, 4))

  1385.             return AVPROBE_SCORE_MAX;

  1386. 

  1387.     return 0;

  1388. }

  1389. 

  1390. AVInputFormat ff_avi_demuxer = {

  1391.     "avi",

  1392.     NULL_IF_CONFIG_SMALL("AVI format"),

  1393.     sizeof(AVIContext),

  1394.     avi_probe,

  1395.     avi_read_header,

  1396.     avi_read_packet,

  1397.     avi_read_close,

  1398.     avi_read_seek,

  1399. };