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.
27329 Commits
32 Branches
698MB
Tree: b92f76e209
Branches Tags
${ item.name }
Create branch ${ searchTerm }
from 'b92f76e209'
${ noResults }
FFmpeg/libavformat/avidec.c

1393 lines
46KB
Raw Blame History 

  1. /*

  2.  * AVI demuxer

  3.  * Copyright (c) 2001 Fabrice Bellard

  4.  *

  5.  * This file is part of FFmpeg.

  6.  *

  7.  * FFmpeg is free software; you can redistribute it and/or

  8.  * modify it under the terms of the GNU Lesser General Public

  9.  * License as published by the Free Software Foundation; either

  10.  * version 2.1 of the License, or (at your option) any later version.

  11.  *

  12.  * FFmpeg is distributed in the hope that it will be useful,

  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  15.  * Lesser General Public License for more details.

  16.  *

  17.  * You should have received a copy of the GNU Lesser General Public

  18.  * License along with FFmpeg; if not, write to the Free Software

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

  20.  */

  21. 

  22. //#define DEBUG

  23. //#define DEBUG_SEEK

  24. 

  25. #include <strings.h>

  26. #include "libavutil/intreadwrite.h"

  27. #include "libavutil/bswap.h"

  28. #include "libavcodec/bytestream.h"

  29. #include "avformat.h"

  30. #include "avi.h"

  31. #include "dv.h"

  32. #include "riff.h"

  33. 

  34. #undef NDEBUG

  35. #include <assert.h>

  36. 

  37. typedef struct AVIStream {

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

  39.                          (used to compute the pts) */

  40.     int remaining;

  41.     int packet_size;

  42. 

  43.     int scale;

  44.     int rate;

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

  46. 

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

  48. 

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

  50.     int prefix_count;

  51.     uint32_t pal[256];

  52.     int has_pal;

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

  54. 

  55.     AVFormatContext *sub_ctx;

  56.     AVPacket sub_pkt;

  57.     uint8_t *sub_buffer;

  58. } AVIStream;

  59. 

  60. typedef struct {

  61.     int64_t  riff_end;

  62.     int64_t  movi_end;

  63.     int64_t  fsize;

  64.     int64_t movi_list;

  65.     int64_t last_pkt_pos;

  66.     int index_loaded;

  67.     int is_odml;

  68.     int non_interleaved;

  69.     int stream_index;

  70.     DVDemuxContext* dv_demux;

  71.     int odml_depth;

  72. #define MAX_ODML_DEPTH 1000

  73. } AVIContext;

  74. 

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

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

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

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

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

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

  81.     { 0 }

  82. };

  83. 

  84. static int avi_load_index(AVFormatContext *s);

  85. static int guess_ni_flag(AVFormatContext *s);

  86. 

  87. #ifdef DEBUG

  88. static void print_tag(const char *str, unsigned int tag, int size)

  89. {

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

  91.            str, tag & 0xff,

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

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

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

  95.            size);

  96. }

  97. #endif

  98. 

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

  100.     if(ast->sample_size){

  101.         return len;

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

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

  104.     }else

  105.         return 1;

  106. }

  107. 

  108. static int get_riff(AVFormatContext *s, ByteIOContext *pb)

  109. {

  110.     AVIContext *avi = s->priv_data;

  111.     char header[8];

  112.     int i;

  113. 

  114.     /* check RIFF header */

  115.     get_buffer(pb, header, 4);

  116.     avi->riff_end = get_le32(pb);   /* RIFF chunk size */

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

  118.     get_buffer(pb, header+4, 4);

  119. 

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

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

  122.             break;

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

  124.         return -1;

  125. 

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

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

  128. 

  129.     return 0;

  130. }

  131. 

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

  133.     AVIContext *avi = s->priv_data;

  134.     ByteIOContext *pb = s->pb;

  135.     int longs_pre_entry= get_le16(pb);

  136.     int index_sub_type = get_byte(pb);

  137.     int index_type     = get_byte(pb);

  138.     int entries_in_use = get_le32(pb);

  139.     int chunk_id       = get_le32(pb);

  140.     int64_t base       = get_le64(pb);

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

  142.     AVStream *st;

  143.     AVIStream *ast;

  144.     int i;

  145.     int64_t last_pos= -1;

  146.     int64_t filesize= url_fsize(s->pb);

  147. 

  148. #ifdef DEBUG_SEEK

  149.     av_log(s, AV_LOG_ERROR, "longs_pre_entry:%d index_type:%d entries_in_use:%d chunk_id:%X base:%16"PRIX64"\n",

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

  151. #endif

  152. 

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

  154.         return -1;

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

  156.     ast = st->priv_data;

  157. 

  158.     if(index_sub_type)

  159.         return -1;

  160. 

  161.     get_le32(pb);

  162. 

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

  164.         return -1;

  165.     if(index_type>1)

  166.         return -1;

  167. 

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

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

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

  171.             base &= 0xFFFFFFFF;

  172.         else

  173.             return -1;

  174.     }

  175. 

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

  177.         if(index_type){

  178.             int64_t pos= get_le32(pb) + base - 8;

  179.             int len    = get_le32(pb);

  180.             int key= len >= 0;

  181.             len &= 0x7FFFFFFF;

  182. 

  183. #ifdef DEBUG_SEEK

  184.             av_log(s, AV_LOG_ERROR, "pos:%"PRId64", len:%X\n", pos, len);

  185. #endif

  186.             if(url_feof(pb))

  187.                 return -1;

  188. 

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

  190.                 avi->non_interleaved= 1;

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

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

  193. 

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

  195.             last_pos= pos;

  196.         }else{

  197.             int64_t offset, pos;

  198.             int duration;

  199.             offset = get_le64(pb);

  200.             get_le32(pb);       /* size */

  201.             duration = get_le32(pb);

  202. 

  203.             if(url_feof(pb))

  204.                 return -1;

  205. 

  206.             pos = url_ftell(pb);

  207. 

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

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

  210.                 return -1;

  211.             }

  212. 

  213.             url_fseek(pb, offset+8, SEEK_SET);

  214.             avi->odml_depth++;

  215.             read_braindead_odml_indx(s, frame_num);

  216.             avi->odml_depth--;

  217.             frame_num += duration;

  218. 

  219.             url_fseek(pb, pos, SEEK_SET);

  220.         }

  221.     }

  222.     avi->index_loaded=1;

  223.     return 0;

  224. }

  225. 

  226. static void clean_index(AVFormatContext *s){

  227.     int i;

  228.     int64_t j;

  229. 

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

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

  232.         AVIStream *ast = st->priv_data;

  233.         int n= st->nb_index_entries;

  234.         int max= ast->sample_size;

  235.         int64_t pos, size, ts;

  236. 

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

  238.             continue;

  239. 

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

  241. 

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

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

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

  245. 

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

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

  248.         }

  249.     }

  250. }

  251. 

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

  253. {

  254.     ByteIOContext *pb = s->pb;

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

  256. 

  257.     size += (size & 1);

  258. 

  259.     if (size == UINT_MAX)

  260.         return -1;

  261.     value = av_malloc(size+1);

  262.     if (!value)

  263.         return -1;

  264.     get_buffer(pb, value, size);

  265.     value[size]=0;

  266. 

  267.     AV_WL32(key, tag);

  268. 

  269.     return av_metadata_set2(st ? &st->metadata : &s->metadata, key, value,

  270.                             AV_METADATA_DONT_STRDUP_VAL);

  271. }

  272. 

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

  274. {

  275.     while (url_ftell(s->pb) < end) {

  276.         uint32_t tag  = get_le32(s->pb);

  277.         uint32_t size = get_le32(s->pb);

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

  279.     }

  280. }

  281. 

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

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

  284. 

  285. static void avi_metadata_creation_time(AVMetadata **metadata, char *date)

  286. {

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

  288.     int i, day, year;

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

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

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

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

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

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

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

  296.                 av_metadata_set2(metadata, "creation_time", buffer, 0);

  297.             }

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

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

  300.         av_metadata_set2(metadata, "creation_time", date, 0);

  301.     }

  302. }

  303. 

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

  305. {

  306.     while (url_ftell(s->pb) < end) {

  307.         uint32_t tag  = get_le32(s->pb);

  308.         uint32_t size = get_le32(s->pb);

  309.         switch (tag) {

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

  311.             uint64_t tag_end = url_ftell(s->pb) + size;

  312.             while (url_ftell(s->pb) < tag_end) {

  313.                 uint16_t tag  = get_le16(s->pb);

  314.                 uint16_t size = get_le16(s->pb);

  315.                 const char *name = NULL;

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

  317.                 size -= get_buffer(s->pb, buffer,

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

  319.                 switch (tag) {

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

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

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

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

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

  325.                     break;

  326.                 }

  327.                 if (name)

  328.                     av_metadata_set2(&s->metadata, name, buffer, 0);

  329.                 url_fskip(s->pb, size);

  330.             }

  331.             break;

  332.         }

  333.         default:

  334.             url_fskip(s->pb, size);

  335.             break;

  336.         }

  337.     }

  338. }

  339. 

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

  341. {

  342.     AVIContext *avi = s->priv_data;

  343.     ByteIOContext *pb = s->pb;

  344.     unsigned int tag, tag1, handler;

  345.     int codec_type, stream_index, frame_period, bit_rate;

  346.     unsigned int size;

  347.     int i;

  348.     AVStream *st;

  349.     AVIStream *ast = NULL;

  350.     int avih_width=0, avih_height=0;

  351.     int amv_file_format=0;

  352.     uint64_t list_end = 0;

  353. 

  354.     avi->stream_index= -1;

  355. 

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

  357.         return -1;

  358. 

  359.     avi->fsize = url_fsize(pb);

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

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

  362. 

  363.     /* first list tag */

  364.     stream_index = -1;

  365.     codec_type = -1;

  366.     frame_period = 0;

  367.     for(;;) {

  368.         if (url_feof(pb))

  369.             goto fail;

  370.         tag = get_le32(pb);

  371.         size = get_le32(pb);

  372. #ifdef DEBUG

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

  374. #endif

  375. 

  376.         switch(tag) {

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

  378.             list_end = url_ftell(pb) + size;

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

  380.             tag1 = get_le32(pb);

  381. #ifdef DEBUG

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

  383. #endif

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

  385.                 avi->movi_list = url_ftell(pb) - 4;

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

  387.                 else     avi->movi_end = url_fsize(pb);

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

  389.                 goto end_of_header;

  390.             }

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

  392.                 avi_read_info(s, list_end);

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

  394.                 avi_read_nikon(s, list_end);

  395. 

  396.             break;

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

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

  399.             size += (size & 1);

  400.             size -= get_buffer(pb, date, FFMIN(size, sizeof(date)-1));

  401.             url_fskip(pb, size);

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

  403.             break;

  404.         }

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

  406.             avi->is_odml = 1;

  407.             url_fskip(pb, size + (size & 1));

  408.             break;

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

  410.             amv_file_format=1;

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

  412.             /* AVI header */

  413.             /* using frame_period is bad idea */

  414.             frame_period = get_le32(pb);

  415.             bit_rate = get_le32(pb) * 8;

  416.             get_le32(pb);

  417.             avi->non_interleaved |= get_le32(pb) & AVIF_MUSTUSEINDEX;

  418. 

  419.             url_fskip(pb, 2 * 4);

  420.             get_le32(pb);

  421.             get_le32(pb);

  422.             avih_width=get_le32(pb);

  423.             avih_height=get_le32(pb);

  424. 

  425.             url_fskip(pb, size - 10 * 4);

  426.             break;

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

  428.             /* stream header */

  429. 

  430.             tag1 = get_le32(pb);

  431.             handler = get_le32(pb); /* codec tag */

  432. 

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

  434.                 url_fskip(pb, size - 8);

  435.                 break;

  436.             }else{

  437.                 stream_index++;

  438.                 st = av_new_stream(s, stream_index);

  439.                 if (!st)

  440.                     goto fail;

  441. 

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

  443.                 if (!ast)

  444.                     goto fail;

  445.                 st->priv_data = ast;

  446.             }

  447.             if(amv_file_format)

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

  449. 

  450. #ifdef DEBUG

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

  452. #endif

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

  454.                 int64_t dv_dur;

  455. 

  456.                 /*

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

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

  459.                  */

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

  461.                     goto fail;

  462. 

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

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

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

  466.                    goto fail;

  467. 

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

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

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

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

  472.                 s->nb_streams = 0;

  473.                 if (CONFIG_DV_DEMUXER) {

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

  475.                     if (!avi->dv_demux)

  476.                         goto fail;

  477.                 }

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

  479.                 url_fskip(pb, 3 * 4);

  480.                 ast->scale = get_le32(pb);

  481.                 ast->rate = get_le32(pb);

  482.                 url_fskip(pb, 4);  /* start time */

  483. 

  484.                 dv_dur = get_le32(pb);

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

  486.                     dv_dur *= AV_TIME_BASE;

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

  488.                 }

  489.                 /*

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

  491.                  *      will make a guess based on bitrate.

  492.                  */

  493. 

  494.                 stream_index = s->nb_streams - 1;

  495.                 url_fskip(pb, size - 9*4);

  496.                 break;

  497.             }

  498. 

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

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

  501. 

  502.             get_le32(pb); /* flags */

  503.             get_le16(pb); /* priority */

  504.             get_le16(pb); /* language */

  505.             get_le32(pb); /* initial frame */

  506.             ast->scale = get_le32(pb);

  507.             ast->rate = get_le32(pb);

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

  509.                 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);

  510.                 if(frame_period){

  511.                     ast->rate = 1000000;

  512.                     ast->scale = frame_period;

  513.                 }else{

  514.                     ast->rate = 25;

  515.                     ast->scale = 1;

  516.                 }

  517.             }

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

  519. 

  520.             ast->cum_len=get_le32(pb); /* start */

  521.             st->nb_frames = get_le32(pb);

  522. 

  523.             st->start_time = 0;

  524.             get_le32(pb); /* buffer size */

  525.             get_le32(pb); /* quality */

  526.             ast->sample_size = get_le32(pb); /* sample ssize */

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

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

  529. 

  530.             switch(tag1) {

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

  532.                 codec_type = AVMEDIA_TYPE_VIDEO;

  533. 

  534.                 ast->sample_size = 0;

  535.                 break;

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

  537.                 codec_type = AVMEDIA_TYPE_AUDIO;

  538.                 break;

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

  540.                 codec_type = AVMEDIA_TYPE_SUBTITLE;

  541.                 break;

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

  543.                 codec_type = AVMEDIA_TYPE_DATA;

  544.                 break;

  545.             default:

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

  547.                 goto fail;

  548.             }

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

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

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

  552.             url_fskip(pb, size - 12 * 4);

  553.             break;

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

  555.             /* stream header */

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

  557.                 url_fskip(pb, size);

  558.             } else {

  559.                 uint64_t cur_pos = url_ftell(pb);

  560.                 if (cur_pos < list_end)

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

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

  563.                 switch(codec_type) {

  564.                 case AVMEDIA_TYPE_VIDEO:

  565.                     if(amv_file_format){

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

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

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

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

  570.                         url_fskip(pb, size);

  571.                         break;

  572.                     }

  573.                     tag1 = ff_get_bmp_header(pb, st);

  574. 

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

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

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

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

  579.                         break;

  580.                     }

  581. 

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

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

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

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

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

  587.                             return AVERROR(ENOMEM);

  588.                         }

  589.                         get_buffer(pb, st->codec->extradata, st->codec->extradata_size);

  590.                     }

  591. 

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

  593.                         get_byte(pb);

  594. 

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

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

  597.                     /* This is true for all paletted codecs implemented in FFmpeg. */

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

  599.                         st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));

  600. #if HAVE_BIGENDIAN

  601.                         for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)

  602.                             st->codec->palctrl->palette[i] = av_bswap32(((uint32_t*)st->codec->extradata)[i]);

  603. #else

  604.                         memcpy(st->codec->palctrl->palette, st->codec->extradata,

  605.                                FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));

  606. #endif

  607.                         st->codec->palctrl->palette_changed = 1;

  608.                     }

  609. 

  610. #ifdef DEBUG

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

  612. #endif

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

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

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

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

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

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

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

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

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

  622. 

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

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

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

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

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

  628.                     }

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

  630. 

  631. //                    url_fskip(pb, size - 5 * 4);

  632.                     break;

  633.                 case AVMEDIA_TYPE_AUDIO:

  634.                     ff_get_wav_header(pb, st->codec, size);

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

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

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

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

  639.                     }

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

  641.                         url_fskip(pb, 1);

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

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

  644.                     st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;

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

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

  647.                      * fail. */

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

  649.                         st->need_parsing = AVSTREAM_PARSE_NONE;

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

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

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

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

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

  655.                     }

  656.                     if (amv_file_format){

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

  658.                         ast->dshow_block_align = 0;

  659.                     }

  660.                     break;

  661.                 case AVMEDIA_TYPE_SUBTITLE:

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

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

  664.                     break;

  665.                 default:

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

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

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

  669.                     url_fskip(pb, size);

  670.                     break;

  671.                 }

  672.             }

  673.             break;

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

  675.             i= url_ftell(pb);

  676.             if(!url_is_streamed(pb) && !(s->flags & AVFMT_FLAG_IGNIDX)){

  677.                 read_braindead_odml_indx(s, 0);

  678.             }

  679.             url_fseek(pb, i+size, SEEK_SET);

  680.             break;

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

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

  683.                 AVRational active, active_aspect;

  684. 

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

  686.                 get_le32(pb);

  687.                 get_le32(pb);

  688.                 get_le32(pb);

  689.                 get_le32(pb);

  690.                 get_le32(pb);

  691. 

  692.                 active_aspect.den= get_le16(pb);

  693.                 active_aspect.num= get_le16(pb);

  694.                 active.num       = get_le32(pb);

  695.                 active.den       = get_le32(pb);

  696.                 get_le32(pb); //nbFieldsPerFrame

  697. 

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

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

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

  701.                 }

  702.                 size -= 9*4;

  703.             }

  704.             url_fseek(pb, size, SEEK_CUR);

  705.             break;

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

  707.             if(s->nb_streams){

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

  709.                 break;

  710.             }

  711.         default:

  712.             if(size > 1000000){

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

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

  715.                 avi->movi_list = url_ftell(pb) - 4;

  716.                 avi->movi_end  = url_fsize(pb);

  717.                 goto end_of_header;

  718.             }

  719.             /* skip tag */

  720.             size += (size & 1);

  721.             url_fskip(pb, size);

  722.             break;

  723.         }

  724.     }

  725.  end_of_header:

  726.     /* check stream number */

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

  728.     fail:

  729.         return -1;

  730.     }

  731. 

  732.     if(!avi->index_loaded && !url_is_streamed(pb))

  733.         avi_load_index(s);

  734.     avi->index_loaded = 1;

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

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

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

  738.         if(st->nb_index_entries)

  739.             break;

  740.     }

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

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

  743.         avi->non_interleaved=0;

  744.     }

  745. 

  746.     if(avi->non_interleaved) {

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

  748.         clean_index(s);

  749.     }

  750. 

  751.     ff_metadata_conv_ctx(s, NULL, ff_avi_metadata_conv);

  752. 

  753.     return 0;

  754. }

  755. 

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

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

  758.         uint8_t desc[256], *d = desc;

  759.         uint8_t *end, *ptr = pkt->data+7;

  760.         unsigned int size, desc_len = bytestream_get_le32(&ptr);

  761.         int score = AVPROBE_SCORE_MAX / 2;

  762.         AVIStream *ast = st->priv_data;

  763.         AVInputFormat *sub_demuxer;

  764.         AVRational time_base;

  765.         ByteIOContext *pb;

  766.         AVProbeData pd;

  767. 

  768.         if (desc_len > FFMAX(pkt->size-17, 0))

  769.             return 0;

  770. 

  771.         end = ptr + desc_len;

  772.         while (ptr < end-1) {

  773.             uint8_t tmp;

  774.             uint32_t ch;

  775.             GET_UTF16(ch, ptr < end-1 ? bytestream_get_le16(&ptr) : 0, break;);

  776.             PUT_UTF8(ch, tmp, if(d-desc < sizeof(desc)-1)  *d++ = tmp;);

  777.         }

  778.         *d = 0;

  779.         if (*desc)

  780.             av_metadata_set2(&st->metadata, "title", desc, 0);

  781. 

  782.         ptr = end + 2;

  783.         size = bytestream_get_le32(&ptr);

  784.         size = FFMIN(size, pkt->size+pkt->data-ptr);

  785. 

  786.         pd = (AVProbeData) { .buf = ptr, .buf_size = size };

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

  788.             return 0;

  789. 

  790.         pb = av_alloc_put_byte(ptr, size, 0, NULL, NULL, NULL, NULL);

  791.         if (!av_open_input_stream(&ast->sub_ctx, pb, "", sub_demuxer, NULL)) {

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

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

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

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

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

  797.         }

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

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

  800.         return 1;

  801.     }

  802.     return 0;

  803. }

  804. 

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

  806.                                   AVPacket *pkt)

  807. {

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

  809.     int64_t ts, next_ts, ts_min = INT64_MAX;

  810.     AVStream *st, *sub_st = NULL;

  811.     int i;

  812. 

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

  814.                            AV_TIME_BASE_Q);

  815. 

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

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

  818.         ast = st->priv_data;

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

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

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

  822.                 ts_min = ts;

  823.                 sub_st = st;

  824.             }

  825.         }

  826.     }

  827. 

  828.     if (sub_st) {

  829.         ast = sub_st->priv_data;

  830.         *pkt = ast->sub_pkt;

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

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

  833.             ast->sub_pkt.data = NULL;

  834.     }

  835.     return sub_st;

  836. }

  837. 

  838. static int get_stream_idx(int *d){

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

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

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

  842.     }else{

  843.         return 100; //invalid stream ID

  844.     }

  845. }

  846. 

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

  848. {

  849.     AVIContext *avi = s->priv_data;

  850.     ByteIOContext *pb = s->pb;

  851.     int n, d[8];

  852.     unsigned int size;

  853.     int64_t i, sync;

  854.     void* dstr;

  855. 

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

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

  858.         if (size >= 0)

  859.             return size;

  860.     }

  861. 

  862.     if(avi->non_interleaved){

  863.         int best_stream_index = 0;

  864.         AVStream *best_st= NULL;

  865.         AVIStream *best_ast;

  866.         int64_t best_ts= INT64_MAX;

  867.         int i;

  868. 

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

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

  871.             AVIStream *ast = st->priv_data;

  872.             int64_t ts= ast->frame_offset;

  873.             int64_t last_ts;

  874. 

  875.             if(!st->nb_index_entries)

  876.                 continue;

  877. 

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

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

  880.                 continue;

  881. 

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

  883. 

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

  885.             if(ts < best_ts){

  886.                 best_ts= ts;

  887.                 best_st= st;

  888.                 best_stream_index= i;

  889.             }

  890.         }

  891.         if(!best_st)

  892.             return -1;

  893. 

  894.         best_ast = best_st->priv_data;

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

  896.         if(best_ast->remaining)

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

  898.         else{

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

  900.             if(i>=0)

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

  902.         }

  903. 

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

  905.         if(i>=0){

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

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

  908.             url_fseek(s->pb, pos + 8, SEEK_SET);

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

  910. 

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

  912. 

  913.             avi->stream_index= best_stream_index;

  914.             if(!best_ast->remaining)

  915.                 best_ast->packet_size=

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

  917.         }

  918.     }

  919. 

  920. resync:

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

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

  923.         AVIStream *ast= st->priv_data;

  924.         int size, err;

  925. 

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

  927.             return 0;

  928. 

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

  930.             size= INT_MAX;

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

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

  933.             size= 1024*ast->sample_size;

  934.         else

  935.             size= ast->sample_size;

  936. 

  937.         if(size > ast->remaining)

  938.             size= ast->remaining;

  939.         avi->last_pkt_pos= url_ftell(pb);

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

  941.         if(err<0)

  942.             return err;

  943. 

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

  945.             void *ptr= av_realloc(pkt->data, pkt->size + 4*256 + FF_INPUT_BUFFER_PADDING_SIZE);

  946.             if(ptr){

  947.             ast->has_pal=0;

  948.             pkt->size += 4*256;

  949.             pkt->data= ptr;

  950.                 memcpy(pkt->data + pkt->size - 4*256, ast->pal, 4*256);

  951.             }else

  952.                 av_log(s, AV_LOG_ERROR, "Failed to append palette\n");

  953.         }

  954. 

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

  956.             dstr = pkt->destruct;

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

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

  959.             pkt->destruct = dstr;

  960.             pkt->flags |= AV_PKT_FLAG_KEY;

  961.             if (size < 0)

  962.                 av_free_packet(pkt);

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

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

  965.             ast->frame_offset++;

  966.             avi->stream_index = -1;

  967.             ast->remaining = 0;

  968.             goto resync;

  969.         } else {

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

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

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

  973.             if(ast->sample_size)

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

  975. //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);

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

  977. 

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

  979.                 AVIndexEntry *e;

  980.                 int index;

  981.                 assert(st->index_entries);

  982. 

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

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

  985. 

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

  987.                     if (e->flags & AVINDEX_KEYFRAME)

  988.                         pkt->flags |= AV_PKT_FLAG_KEY;

  989.                 }

  990.             } else {

  991.                 pkt->flags |= AV_PKT_FLAG_KEY;

  992.             }

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

  994.         }

  995.         ast->remaining -= size;

  996.         if(!ast->remaining){

  997.             avi->stream_index= -1;

  998.             ast->packet_size= 0;

  999.         }

  1000. 

  1001.         return size;

  1002.     }

  1003. 

  1004.     memset(d, -1, sizeof(int)*8);

  1005.     for(i=sync=url_ftell(pb); !url_feof(pb); i++) {

  1006.         int j;

  1007. 

  1008.         for(j=0; j<7; j++)

  1009.             d[j]= d[j+1];

  1010.         d[7]= get_byte(pb);

  1011. 

  1012.         size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);

  1013. 

  1014.         n= get_stream_idx(d+2);

  1015. //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);

  1016.         if(i + (uint64_t)size > avi->fsize || d[0]<0)

  1017.             continue;

  1018. 

  1019.         //parse ix##

  1020.         if(  (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)

  1021.         //parse JUNK

  1022.            ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')

  1023.            ||(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')){

  1024.             url_fskip(pb, size);

  1025. //av_log(s, AV_LOG_DEBUG, "SKIP\n");

  1026.             goto resync;

  1027.         }

  1028. 

  1029.         //parse stray LIST

  1030.         if(d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T'){

  1031.             url_fskip(pb, 4);

  1032.             goto resync;

  1033.         }

  1034. 

  1035.         n= get_stream_idx(d);

  1036. 

  1037.         if(!((i-avi->last_pkt_pos)&1) && get_stream_idx(d+1) < s->nb_streams)

  1038.             continue;

  1039. 

  1040.         //detect ##ix chunk and skip

  1041.         if(d[2] == 'i' && d[3] == 'x' && n < s->nb_streams){

  1042.             url_fskip(pb, size);

  1043.             goto resync;

  1044.         }

  1045. 

  1046.         //parse ##dc/##wb

  1047.         if(n < s->nb_streams){

  1048.             AVStream *st;

  1049.             AVIStream *ast;

  1050.             st = s->streams[n];

  1051.             ast = st->priv_data;

  1052. 

  1053.             if(s->nb_streams>=2){

  1054.                 AVStream *st1  = s->streams[1];

  1055.                 AVIStream *ast1= st1->priv_data;

  1056.                 //workaround for broken small-file-bug402.avi

  1057.                 if(   d[2] == 'w' && d[3] == 'b'

  1058.                    && n==0

  1059.                    && st ->codec->codec_type == AVMEDIA_TYPE_VIDEO

  1060.                    && st1->codec->codec_type == AVMEDIA_TYPE_AUDIO

  1061.                    && ast->prefix == 'd'*256+'c'

  1062.                    && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)

  1063.                   ){

  1064.                     n=1;

  1065.                     st = st1;

  1066.                     ast = ast1;

  1067.                     av_log(s, AV_LOG_WARNING, "Invalid stream + prefix combination, assuming audio.\n");

  1068.                 }

  1069.             }

  1070. 

  1071. 

  1072.             if(   (st->discard >= AVDISCARD_DEFAULT && size==0)

  1073.                /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & AV_PKT_FLAG_KEY))*/ //FIXME needs a little reordering

  1074.                || st->discard >= AVDISCARD_ALL){

  1075.                 ast->frame_offset += get_duration(ast, size);

  1076.                 url_fskip(pb, size);

  1077.                 goto resync;

  1078.             }

  1079. 

  1080.             if (d[2] == 'p' && d[3] == 'c' && size<=4*256+4) {

  1081.                 int k = get_byte(pb);

  1082.                 int last = (k + get_byte(pb) - 1) & 0xFF;

  1083. 

  1084.                 get_le16(pb); //flags

  1085. 

  1086.                 for (; k <= last; k++)

  1087.                     ast->pal[k] = get_be32(pb)>>8;// b + (g << 8) + (r << 16);

  1088.                 ast->has_pal= 1;

  1089.                 goto resync;

  1090.             } else if(   ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||

  1091.                          d[2]*256+d[3] == ast->prefix /*||

  1092.                          (d[2] == 'd' && d[3] == 'c') ||

  1093.                          (d[2] == 'w' && d[3] == 'b')*/) {

  1094. 

  1095. //av_log(s, AV_LOG_DEBUG, "OK\n");

  1096.                 if(d[2]*256+d[3] == ast->prefix)

  1097.                     ast->prefix_count++;

  1098.                 else{

  1099.                     ast->prefix= d[2]*256+d[3];

  1100.                     ast->prefix_count= 0;

  1101.                 }

  1102. 

  1103.                 avi->stream_index= n;

  1104.                 ast->packet_size= size + 8;

  1105.                 ast->remaining= size;

  1106. 

  1107.                 if(size || !ast->sample_size){

  1108.                     uint64_t pos= url_ftell(pb) - 8;

  1109.                     if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){

  1110.                         av_add_index_entry(st, pos, ast->frame_offset, size, 0, AVINDEX_KEYFRAME);

  1111.                     }

  1112.                 }

  1113.                 goto resync;

  1114.             }

  1115.         }

  1116.     }

  1117. 

  1118.     return AVERROR_EOF;

  1119. }

  1120. 

  1121. /* XXX: We make the implicit supposition that the positions are sorted

  1122.    for each stream. */

  1123. static int avi_read_idx1(AVFormatContext *s, int size)

  1124. {

  1125.     AVIContext *avi = s->priv_data;

  1126.     ByteIOContext *pb = s->pb;

  1127.     int nb_index_entries, i;

  1128.     AVStream *st;

  1129.     AVIStream *ast;

  1130.     unsigned int index, tag, flags, pos, len;

  1131.     unsigned last_pos= -1;

  1132. 

  1133.     nb_index_entries = size / 16;

  1134.     if (nb_index_entries <= 0)

  1135.         return -1;

  1136. 

  1137.     /* Read the entries and sort them in each stream component. */

  1138.     for(i = 0; i < nb_index_entries; i++) {

  1139.         tag = get_le32(pb);

  1140.         flags = get_le32(pb);

  1141.         pos = get_le32(pb);

  1142.         len = get_le32(pb);

  1143. #if defined(DEBUG_SEEK)

  1144.         av_log(s, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",

  1145.                i, tag, flags, pos, len);

  1146. #endif

  1147.         if(i==0 && pos > avi->movi_list)

  1148.             avi->movi_list= 0; //FIXME better check

  1149.         pos += avi->movi_list;

  1150. 

  1151.         index = ((tag & 0xff) - '0') * 10;

  1152.         index += ((tag >> 8) & 0xff) - '0';

  1153.         if (index >= s->nb_streams)

  1154.             continue;

  1155.         st = s->streams[index];

  1156.         ast = st->priv_data;

  1157. 

  1158. #if defined(DEBUG_SEEK)

  1159.         av_log(s, AV_LOG_DEBUG, "%d cum_len=%"PRId64"\n", len, ast->cum_len);

  1160. #endif

  1161.         if(url_feof(pb))

  1162.             return -1;

  1163. 

  1164.         if(last_pos == pos)

  1165.             avi->non_interleaved= 1;

  1166.         else if(len || !ast->sample_size)

  1167.             av_add_index_entry(st, pos, ast->cum_len, len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);

  1168.         ast->cum_len += get_duration(ast, len);

  1169.         last_pos= pos;

  1170.     }

  1171.     return 0;

  1172. }

  1173. 

  1174. static int guess_ni_flag(AVFormatContext *s){

  1175.     int i;

  1176.     int64_t last_start=0;

  1177.     int64_t first_end= INT64_MAX;

  1178.     int64_t oldpos= url_ftell(s->pb);

  1179. 

  1180.     for(i=0; i<s->nb_streams; i++){

  1181.         AVStream *st = s->streams[i];

  1182.         int n= st->nb_index_entries;

  1183.         unsigned int size;

  1184. 

  1185.         if(n <= 0)

  1186.             continue;

  1187. 

  1188.         if(n >= 2){

  1189.             int64_t pos= st->index_entries[0].pos;

  1190.             url_fseek(s->pb, pos + 4, SEEK_SET);

  1191.             size= get_le32(s->pb);

  1192.             if(pos + size > st->index_entries[1].pos)

  1193.                 last_start= INT64_MAX;

  1194.         }

  1195. 

  1196.         if(st->index_entries[0].pos > last_start)

  1197.             last_start= st->index_entries[0].pos;

  1198.         if(st->index_entries[n-1].pos < first_end)

  1199.             first_end= st->index_entries[n-1].pos;

  1200.     }

  1201.     url_fseek(s->pb, oldpos, SEEK_SET);

  1202.     return last_start > first_end;

  1203. }

  1204. 

  1205. static int avi_load_index(AVFormatContext *s)

  1206. {

  1207.     AVIContext *avi = s->priv_data;

  1208.     ByteIOContext *pb = s->pb;

  1209.     uint32_t tag, size;

  1210.     int64_t pos= url_ftell(pb);

  1211.     int ret = -1;

  1212. 

  1213.     if (url_fseek(pb, avi->movi_end, SEEK_SET) < 0)

  1214.         goto the_end; // maybe truncated file

  1215. #ifdef DEBUG_SEEK

  1216.     printf("movi_end=0x%"PRIx64"\n", avi->movi_end);

  1217. #endif

  1218.     for(;;) {

  1219.         if (url_feof(pb))

  1220.             break;

  1221.         tag = get_le32(pb);

  1222.         size = get_le32(pb);

  1223. #ifdef DEBUG_SEEK

  1224.         printf("tag=%c%c%c%c size=0x%x\n",

  1225.                tag & 0xff,

  1226.                (tag >> 8) & 0xff,

  1227.                (tag >> 16) & 0xff,

  1228.                (tag >> 24) & 0xff,

  1229.                size);

  1230. #endif

  1231.         switch(tag) {

  1232.         case MKTAG('i', 'd', 'x', '1'):

  1233.             if (avi_read_idx1(s, size) < 0)

  1234.                 goto skip;

  1235.             ret = 0;

  1236.                 goto the_end;

  1237.             break;

  1238.         default:

  1239.         skip:

  1240.             size += (size & 1);

  1241.             if (url_fseek(pb, size, SEEK_CUR) < 0)

  1242.                 goto the_end; // something is wrong here

  1243.             break;

  1244.         }

  1245.     }

  1246.  the_end:

  1247.     url_fseek(pb, pos, SEEK_SET);

  1248.     return ret;

  1249. }

  1250. 

  1251. static void seek_subtitle(AVStream *st, AVStream *st2, int64_t timestamp)

  1252. {

  1253.     AVIStream *ast2 = st2->priv_data;

  1254.     int64_t ts2 = av_rescale_q(timestamp, st->time_base, st2->time_base);

  1255.     av_free_packet(&ast2->sub_pkt);

  1256.     if (avformat_seek_file(ast2->sub_ctx, 0, INT64_MIN, ts2, ts2, 0) >= 0 ||

  1257.         avformat_seek_file(ast2->sub_ctx, 0, ts2, ts2, INT64_MAX, 0) >= 0)

  1258.         av_read_packet(ast2->sub_ctx, &ast2->sub_pkt);

  1259. }

  1260. 

  1261. static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)

  1262. {

  1263.     AVIContext *avi = s->priv_data;

  1264.     AVStream *st;

  1265.     int i, index;

  1266.     int64_t pos;

  1267.     AVIStream *ast;

  1268. 

  1269.     if (!avi->index_loaded) {

  1270.         /* we only load the index on demand */

  1271.         avi_load_index(s);

  1272.         avi->index_loaded = 1;

  1273.     }

  1274.     assert(stream_index>= 0);

  1275. 

  1276.     st = s->streams[stream_index];

  1277.     ast= st->priv_data;

  1278.     index= av_index_search_timestamp(st, timestamp * FFMAX(ast->sample_size, 1), flags);

  1279.     if(index<0)

  1280.         return -1;

  1281. 

  1282.     /* find the position */

  1283.     pos = st->index_entries[index].pos;

  1284.     timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1);

  1285. 

  1286. //    av_log(s, AV_LOG_DEBUG, "XX %"PRId64" %d %"PRId64"\n", timestamp, index, st->index_entries[index].timestamp);

  1287. 

  1288.     if (CONFIG_DV_DEMUXER && avi->dv_demux) {

  1289.         /* One and only one real stream for DV in AVI, and it has video  */

  1290.         /* offsets. Calling with other stream indexes should have failed */

  1291.         /* the av_index_search_timestamp call above.                     */

  1292.         assert(stream_index == 0);

  1293. 

  1294.         /* Feed the DV video stream version of the timestamp to the */

  1295.         /* DV demux so it can synthesize correct timestamps.        */

  1296.         dv_offset_reset(avi->dv_demux, timestamp);

  1297. 

  1298.         url_fseek(s->pb, pos, SEEK_SET);

  1299.         avi->stream_index= -1;

  1300.         return 0;

  1301.     }

  1302. 

  1303.     for(i = 0; i < s->nb_streams; i++) {

  1304.         AVStream *st2 = s->streams[i];

  1305.         AVIStream *ast2 = st2->priv_data;

  1306. 

  1307.         ast2->packet_size=

  1308.         ast2->remaining= 0;

  1309. 

  1310.         if (ast2->sub_ctx) {

  1311.             seek_subtitle(st, st2, timestamp);

  1312.             continue;

  1313.         }

  1314. 

  1315.         if (st2->nb_index_entries <= 0)

  1316.             continue;

  1317. 

  1318. //        assert(st2->codec->block_align);

  1319.         assert((int64_t)st2->time_base.num*ast2->rate == (int64_t)st2->time_base.den*ast2->scale);

  1320.         index = av_index_search_timestamp(

  1321.                 st2,

  1322.                 av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),

  1323.                 flags | AVSEEK_FLAG_BACKWARD);

  1324.         if(index<0)

  1325.             index=0;

  1326. 

  1327.         if(!avi->non_interleaved){

  1328.             while(index>0 && st2->index_entries[index].pos > pos)

  1329.                 index--;

  1330.             while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos)

  1331.                 index++;

  1332.         }

  1333. 

  1334. //        av_log(s, AV_LOG_DEBUG, "%"PRId64" %d %"PRId64"\n", timestamp, index, st2->index_entries[index].timestamp);

  1335.         /* extract the current frame number */

  1336.         ast2->frame_offset = st2->index_entries[index].timestamp;

  1337.     }

  1338. 

  1339.     /* do the seek */

  1340.     url_fseek(s->pb, pos, SEEK_SET);

  1341.     avi->stream_index= -1;

  1342.     return 0;

  1343. }

  1344. 

  1345. static int avi_read_close(AVFormatContext *s)

  1346. {

  1347.     int i;

  1348.     AVIContext *avi = s->priv_data;

  1349. 

  1350.     for(i=0;i<s->nb_streams;i++) {

  1351.         AVStream *st = s->streams[i];

  1352.         AVIStream *ast = st->priv_data;

  1353.         av_free(st->codec->palctrl);

  1354.         if (ast) {

  1355.             if (ast->sub_ctx) {

  1356.                 av_freep(&ast->sub_ctx->pb);

  1357.                 av_close_input_stream(ast->sub_ctx);

  1358.             }

  1359.             av_free(ast->sub_buffer);

  1360.             av_free_packet(&ast->sub_pkt);

  1361.         }

  1362.     }

  1363. 

  1364.     if (avi->dv_demux)

  1365.         av_free(avi->dv_demux);

  1366. 

  1367.     return 0;

  1368. }

  1369. 

  1370. static int avi_probe(AVProbeData *p)

  1371. {

  1372.     int i;

  1373. 

  1374.     /* check file header */

  1375.     for(i=0; avi_headers[i][0]; i++)

  1376.         if(!memcmp(p->buf  , avi_headers[i]  , 4) &&

  1377.            !memcmp(p->buf+8, avi_headers[i]+4, 4))

  1378.             return AVPROBE_SCORE_MAX;

  1379. 

  1380.     return 0;

  1381. }

  1382. 

  1383. AVInputFormat avi_demuxer = {

  1384.     "avi",

  1385.     NULL_IF_CONFIG_SMALL("AVI format"),

  1386.     sizeof(AVIContext),

  1387.     avi_probe,

  1388.     avi_read_header,

  1389.     avi_read_packet,

  1390.     avi_read_close,

  1391.     avi_read_seek,

  1392. };