FFmpeg: libavformat/avidec.c Source File

00001 /*
00002  * AVI demuxer
00003  * Copyright (c) 2001 Fabrice Bellard
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * FFmpeg is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with FFmpeg; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00022 #include "libavutil/intreadwrite.h"
00023 #include "libavutil/mathematics.h"
00024 #include "libavutil/bswap.h"
00025 #include "libavutil/opt.h"
00026 #include "libavutil/dict.h"
00027 #include "libavutil/avstring.h"
00028 #include "libavutil/avassert.h"
00029 #include "avformat.h"
00030 #include "internal.h"
00031 #include "avi.h"
00032 #include "dv.h"
00033 #include "riff.h"
00034 
00035 typedef struct AVIStream {
00036     int64_t frame_offset; /* current frame (video) or byte (audio) counter
00037                          (used to compute the pts) */
00038     int remaining;
00039     int packet_size;
00040 
00041     uint32_t scale;
00042     uint32_t rate;
00043     int sample_size; /* size of one sample (or packet) (in the rate/scale sense) in bytes */
00044 
00045     int64_t cum_len; /* temporary storage (used during seek) */
00046 
00047     int prefix;                       
00048     int prefix_count;
00049     uint32_t pal[256];
00050     int has_pal;
00051     int dshow_block_align;            
00052 
00053     AVFormatContext *sub_ctx;
00054     AVPacket sub_pkt;
00055     uint8_t *sub_buffer;
00056 
00057     int64_t seek_pos;
00058 } AVIStream;
00059 
00060 typedef struct {
00061     const AVClass *class;
00062     int64_t  riff_end;
00063     int64_t  movi_end;
00064     int64_t  fsize;
00065     int64_t movi_list;
00066     int64_t last_pkt_pos;
00067     int index_loaded;
00068     int is_odml;
00069     int non_interleaved;
00070     int stream_index;
00071     DVDemuxContext* dv_demux;
00072     int odml_depth;
00073     int use_odml;
00074 #define MAX_ODML_DEPTH 1000
00075     int64_t dts_max;
00076 } AVIContext;
00077 
00078 
00079 static const AVOption options[] = {
00080     { "use_odml", "use odml index", offsetof(AVIContext, use_odml), AV_OPT_TYPE_INT, {.i64 = 1}, -1, 1, AV_OPT_FLAG_DECODING_PARAM},
00081     { NULL },
00082 };
00083 
00084 static const AVClass demuxer_class = {
00085     .class_name = "avi",
00086     .item_name  = av_default_item_name,
00087     .option     = options,
00088     .version    = LIBAVUTIL_VERSION_INT,
00089     .category   = AV_CLASS_CATEGORY_DEMUXER,
00090 };
00091 
00092 
00093 static const char avi_headers[][8] = {
00094     { 'R', 'I', 'F', 'F',    'A', 'V', 'I', ' ' },
00095     { 'R', 'I', 'F', 'F',    'A', 'V', 'I', 'X' },
00096     { 'R', 'I', 'F', 'F',    'A', 'V', 'I', 0x19},
00097     { 'O', 'N', '2', ' ',    'O', 'N', '2', 'f' },
00098     { 'R', 'I', 'F', 'F',    'A', 'M', 'V', ' ' },
00099     { 0 }
00100 };
00101 
00102 static const AVMetadataConv avi_metadata_conv[] = {
00103     { "strn", "title" },
00104     { 0 },
00105 };
00106 
00107 static int avi_load_index(AVFormatContext *s);
00108 static int guess_ni_flag(AVFormatContext *s);
00109 
00110 #define print_tag(str, tag, size)                       \
00111     av_dlog(NULL, "%s: tag=%c%c%c%c size=0x%x\n",       \
00112            str, tag & 0xff,                             \
00113            (tag >> 8) & 0xff,                           \
00114            (tag >> 16) & 0xff,                          \
00115            (tag >> 24) & 0xff,                          \
00116            size)
00117 
00118 static inline int get_duration(AVIStream *ast, int len){
00119     if(ast->sample_size){
00120         return len;
00121     }else if (ast->dshow_block_align){
00122         return (len + ast->dshow_block_align - 1)/ast->dshow_block_align;
00123     }else
00124         return 1;
00125 }
00126 
00127 static int get_riff(AVFormatContext *s, AVIOContext *pb)
00128 {
00129     AVIContext *avi = s->priv_data;
00130     char header[8];
00131     int i;
00132 
00133     /* check RIFF header */
00134     avio_read(pb, header, 4);
00135     avi->riff_end = avio_rl32(pb);  /* RIFF chunk size */
00136     avi->riff_end += avio_tell(pb); /* RIFF chunk end */
00137     avio_read(pb, header+4, 4);
00138 
00139     for(i=0; avi_headers[i][0]; i++)
00140         if(!memcmp(header, avi_headers[i], 8))
00141             break;
00142     if(!avi_headers[i][0])
00143         return -1;
00144 
00145     if(header[7] == 0x19)
00146         av_log(s, AV_LOG_INFO, "This file has been generated by a totally broken muxer.\n");
00147 
00148     return 0;
00149 }
00150 
00151 static int read_braindead_odml_indx(AVFormatContext *s, int frame_num){
00152     AVIContext *avi = s->priv_data;
00153     AVIOContext *pb = s->pb;
00154     int longs_pre_entry= avio_rl16(pb);
00155     int index_sub_type = avio_r8(pb);
00156     int index_type     = avio_r8(pb);
00157     int entries_in_use = avio_rl32(pb);
00158     int chunk_id       = avio_rl32(pb);
00159     int64_t base       = avio_rl64(pb);
00160     int stream_id= 10*((chunk_id&0xFF) - '0') + (((chunk_id>>8)&0xFF) - '0');
00161     AVStream *st;
00162     AVIStream *ast;
00163     int i;
00164     int64_t last_pos= -1;
00165     int64_t filesize= avi->fsize;
00166 
00167     av_dlog(s, "longs_pre_entry:%d index_type:%d entries_in_use:%d chunk_id:%X base:%16"PRIX64"\n",
00168             longs_pre_entry,index_type, entries_in_use, chunk_id, base);
00169 
00170     if(stream_id >= s->nb_streams || stream_id < 0)
00171         return -1;
00172     st= s->streams[stream_id];
00173     ast = st->priv_data;
00174 
00175     if(index_sub_type)
00176         return -1;
00177 
00178     avio_rl32(pb);
00179 
00180     if(index_type && longs_pre_entry != 2)
00181         return -1;
00182     if(index_type>1)
00183         return -1;
00184 
00185     if(filesize > 0 && base >= filesize){
00186         av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
00187         if(base>>32 == (base & 0xFFFFFFFF) && (base & 0xFFFFFFFF) < filesize && filesize <= 0xFFFFFFFF)
00188             base &= 0xFFFFFFFF;
00189         else
00190             return -1;
00191     }
00192 
00193     for(i=0; i<entries_in_use; i++){
00194         if(index_type){
00195             int64_t pos= avio_rl32(pb) + base - 8;
00196             int len    = avio_rl32(pb);
00197             int key= len >= 0;
00198             len &= 0x7FFFFFFF;
00199 
00200 #ifdef DEBUG_SEEK
00201             av_log(s, AV_LOG_ERROR, "pos:%"PRId64", len:%X\n", pos, len);
00202 #endif
00203             if(url_feof(pb))
00204                 return -1;
00205 
00206             if(last_pos == pos || pos == base - 8)
00207                 avi->non_interleaved= 1;
00208             if(last_pos != pos && (len || !ast->sample_size))
00209                 av_add_index_entry(st, pos, ast->cum_len, len, 0, key ? AVINDEX_KEYFRAME : 0);
00210 
00211             ast->cum_len += get_duration(ast, len);
00212             last_pos= pos;
00213         }else{
00214             int64_t offset, pos;
00215             int duration;
00216             offset = avio_rl64(pb);
00217             avio_rl32(pb);       /* size */
00218             duration = avio_rl32(pb);
00219 
00220             if(url_feof(pb))
00221                 return -1;
00222 
00223             pos = avio_tell(pb);
00224 
00225             if(avi->odml_depth > MAX_ODML_DEPTH){
00226                 av_log(s, AV_LOG_ERROR, "Too deeply nested ODML indexes\n");
00227                 return -1;
00228             }
00229 
00230             if(avio_seek(pb, offset+8, SEEK_SET) < 0)
00231                 return -1;
00232             avi->odml_depth++;
00233             read_braindead_odml_indx(s, frame_num);
00234             avi->odml_depth--;
00235             frame_num += duration;
00236 
00237             if(avio_seek(pb, pos, SEEK_SET) < 0) {
00238                 av_log(s, AV_LOG_ERROR, "Failed to restore position after reading index\n");
00239                 return -1;
00240             }
00241 
00242         }
00243     }
00244     avi->index_loaded=2;
00245     return 0;
00246 }
00247 
00248 static void clean_index(AVFormatContext *s){
00249     int i;
00250     int64_t j;
00251 
00252     for(i=0; i<s->nb_streams; i++){
00253         AVStream *st = s->streams[i];
00254         AVIStream *ast = st->priv_data;
00255         int n= st->nb_index_entries;
00256         int max= ast->sample_size;
00257         int64_t pos, size, ts;
00258 
00259         if(n != 1 || ast->sample_size==0)
00260             continue;
00261 
00262         while(max < 1024) max+=max;
00263 
00264         pos= st->index_entries[0].pos;
00265         size= st->index_entries[0].size;
00266         ts= st->index_entries[0].timestamp;
00267 
00268         for(j=0; j<size; j+=max){
00269             av_add_index_entry(st, pos+j, ts+j, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME);
00270         }
00271     }
00272 }
00273 
00274 static int avi_read_tag(AVFormatContext *s, AVStream *st, uint32_t tag, uint32_t size)
00275 {
00276     AVIOContext *pb = s->pb;
00277     char key[5] = {0}, *value;
00278 
00279     size += (size & 1);
00280 
00281     if (size == UINT_MAX)
00282         return -1;
00283     value = av_malloc(size+1);
00284     if (!value)
00285         return -1;
00286     avio_read(pb, value, size);
00287     value[size]=0;
00288 
00289     AV_WL32(key, tag);
00290 
00291     return av_dict_set(st ? &st->metadata : &s->metadata, key, value,
00292                             AV_DICT_DONT_STRDUP_VAL);
00293 }
00294 
00295 static const char months[12][4] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
00296                                     "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
00297 
00298 static void avi_metadata_creation_time(AVDictionary **metadata, char *date)
00299 {
00300     char month[4], time[9], buffer[64];
00301     int i, day, year;
00302     /* parse standard AVI date format (ie. "Mon Mar 10 15:04:43 2003") */
00303     if (sscanf(date, "%*3s%*[ ]%3s%*[ ]%2d%*[ ]%8s%*[ ]%4d",
00304                month, &day, time, &year) == 4) {
00305         for (i=0; i<12; i++)
00306             if (!av_strcasecmp(month, months[i])) {
00307                 snprintf(buffer, sizeof(buffer), "%.4d-%.2d-%.2d %s",
00308                          year, i+1, day, time);
00309                 av_dict_set(metadata, "creation_time", buffer, 0);
00310             }
00311     } else if (date[4] == '/' && date[7] == '/') {
00312         date[4] = date[7] = '-';
00313         av_dict_set(metadata, "creation_time", date, 0);
00314     }
00315 }
00316 
00317 static void avi_read_nikon(AVFormatContext *s, uint64_t end)
00318 {
00319     while (avio_tell(s->pb) < end) {
00320         uint32_t tag  = avio_rl32(s->pb);
00321         uint32_t size = avio_rl32(s->pb);
00322         switch (tag) {
00323         case MKTAG('n', 'c', 't', 'g'): {  /* Nikon Tags */
00324             uint64_t tag_end = avio_tell(s->pb) + size;
00325             while (avio_tell(s->pb) < tag_end) {
00326                 uint16_t tag  = avio_rl16(s->pb);
00327                 uint16_t size = avio_rl16(s->pb);
00328                 const char *name = NULL;
00329                 char buffer[64] = {0};
00330                 size -= avio_read(s->pb, buffer,
00331                                    FFMIN(size, sizeof(buffer)-1));
00332                 switch (tag) {
00333                 case 0x03:  name = "maker";  break;
00334                 case 0x04:  name = "model";  break;
00335                 case 0x13:  name = "creation_time";
00336                     if (buffer[4] == ':' && buffer[7] == ':')
00337                         buffer[4] = buffer[7] = '-';
00338                     break;
00339                 }
00340                 if (name)
00341                     av_dict_set(&s->metadata, name, buffer, 0);
00342                 avio_skip(s->pb, size);
00343             }
00344             break;
00345         }
00346         default:
00347             avio_skip(s->pb, size);
00348             break;
00349         }
00350     }
00351 }
00352 
00353 static int avi_read_header(AVFormatContext *s)
00354 {
00355     AVIContext *avi = s->priv_data;
00356     AVIOContext *pb = s->pb;
00357     unsigned int tag, tag1, handler;
00358     int codec_type, stream_index, frame_period;
00359     unsigned int size;
00360     int i;
00361     AVStream *st;
00362     AVIStream *ast = NULL;
00363     int avih_width=0, avih_height=0;
00364     int amv_file_format=0;
00365     uint64_t list_end = 0;
00366     int ret;
00367 
00368     avi->stream_index= -1;
00369 
00370     if (get_riff(s, pb) < 0)
00371         return -1;
00372 
00373     av_log(avi, AV_LOG_DEBUG, "use odml:%d\n", avi->use_odml);
00374 
00375     avi->fsize = avio_size(pb);
00376     if(avi->fsize<=0 || avi->fsize < avi->riff_end)
00377         avi->fsize= avi->riff_end == 8 ? INT64_MAX : avi->riff_end;
00378 
00379     /* first list tag */
00380     stream_index = -1;
00381     codec_type = -1;
00382     frame_period = 0;
00383     for(;;) {
00384         if (url_feof(pb))
00385             goto fail;
00386         tag = avio_rl32(pb);
00387         size = avio_rl32(pb);
00388 
00389         print_tag("tag", tag, size);
00390 
00391         switch(tag) {
00392         case MKTAG('L', 'I', 'S', 'T'):
00393             list_end = avio_tell(pb) + size;
00394             /* Ignored, except at start of video packets. */
00395             tag1 = avio_rl32(pb);
00396 
00397             print_tag("list", tag1, 0);
00398 
00399             if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
00400                 avi->movi_list = avio_tell(pb) - 4;
00401                 if(size) avi->movi_end = avi->movi_list + size + (size & 1);
00402                 else     avi->movi_end = avi->fsize;
00403                 av_dlog(NULL, "movi end=%"PRIx64"\n", avi->movi_end);
00404                 goto end_of_header;
00405             }
00406             else if (tag1 == MKTAG('I', 'N', 'F', 'O'))
00407                 ff_read_riff_info(s, size - 4);
00408             else if (tag1 == MKTAG('n', 'c', 'd', 't'))
00409                 avi_read_nikon(s, list_end);
00410 
00411             break;
00412         case MKTAG('I', 'D', 'I', 'T'): {
00413             unsigned char date[64] = {0};
00414             size += (size & 1);
00415             size -= avio_read(pb, date, FFMIN(size, sizeof(date)-1));
00416             avio_skip(pb, size);
00417             avi_metadata_creation_time(&s->metadata, date);
00418             break;
00419         }
00420         case MKTAG('d', 'm', 'l', 'h'):
00421             avi->is_odml = 1;
00422             avio_skip(pb, size + (size & 1));
00423             break;
00424         case MKTAG('a', 'm', 'v', 'h'):
00425             amv_file_format=1;
00426         case MKTAG('a', 'v', 'i', 'h'):
00427             /* AVI header */
00428             /* using frame_period is bad idea */
00429             frame_period = avio_rl32(pb);
00430             avio_rl32(pb); /* max. bytes per second */
00431             avio_rl32(pb);
00432             avi->non_interleaved |= avio_rl32(pb) & AVIF_MUSTUSEINDEX;
00433 
00434             avio_skip(pb, 2 * 4);
00435             avio_rl32(pb);
00436             avio_rl32(pb);
00437             avih_width=avio_rl32(pb);
00438             avih_height=avio_rl32(pb);
00439 
00440             avio_skip(pb, size - 10 * 4);
00441             break;
00442         case MKTAG('s', 't', 'r', 'h'):
00443             /* stream header */
00444 
00445             tag1 = avio_rl32(pb);
00446             handler = avio_rl32(pb); /* codec tag */
00447 
00448             if(tag1 == MKTAG('p', 'a', 'd', 's')){
00449                 avio_skip(pb, size - 8);
00450                 break;
00451             }else{
00452                 stream_index++;
00453                 st = avformat_new_stream(s, NULL);
00454                 if (!st)
00455                     goto fail;
00456 
00457                 st->id = stream_index;
00458                 ast = av_mallocz(sizeof(AVIStream));
00459                 if (!ast)
00460                     goto fail;
00461                 st->priv_data = ast;
00462             }
00463             if(amv_file_format)
00464                 tag1 = stream_index ? MKTAG('a','u','d','s') : MKTAG('v','i','d','s');
00465 
00466             print_tag("strh", tag1, -1);
00467 
00468             if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
00469                 int64_t dv_dur;
00470 
00471                 /*
00472                  * After some consideration -- I don't think we
00473                  * have to support anything but DV in type1 AVIs.
00474                  */
00475                 if (s->nb_streams != 1)
00476                     goto fail;
00477 
00478                 if (handler != MKTAG('d', 'v', 's', 'd') &&
00479                     handler != MKTAG('d', 'v', 'h', 'd') &&
00480                     handler != MKTAG('d', 'v', 's', 'l'))
00481                    goto fail;
00482 
00483                 ast = s->streams[0]->priv_data;
00484                 av_freep(&s->streams[0]->codec->extradata);
00485                 av_freep(&s->streams[0]->codec);
00486                 av_freep(&s->streams[0]->info);
00487                 av_freep(&s->streams[0]);
00488                 s->nb_streams = 0;
00489                 if (CONFIG_DV_DEMUXER) {
00490                     avi->dv_demux = avpriv_dv_init_demux(s);
00491                     if (!avi->dv_demux)
00492                         goto fail;
00493                 }
00494                 s->streams[0]->priv_data = ast;
00495                 avio_skip(pb, 3 * 4);
00496                 ast->scale = avio_rl32(pb);
00497                 ast->rate = avio_rl32(pb);
00498                 avio_skip(pb, 4);  /* start time */
00499 
00500                 dv_dur = avio_rl32(pb);
00501                 if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
00502                     dv_dur *= AV_TIME_BASE;
00503                     s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
00504                 }
00505                 /*
00506                  * else, leave duration alone; timing estimation in utils.c
00507                  *      will make a guess based on bitrate.
00508                  */
00509 
00510                 stream_index = s->nb_streams - 1;
00511                 avio_skip(pb, size - 9*4);
00512                 break;
00513             }
00514 
00515             av_assert0(stream_index < s->nb_streams);
00516             st->codec->stream_codec_tag= handler;
00517 
00518             avio_rl32(pb); /* flags */
00519             avio_rl16(pb); /* priority */
00520             avio_rl16(pb); /* language */
00521             avio_rl32(pb); /* initial frame */
00522             ast->scale = avio_rl32(pb);
00523             ast->rate = avio_rl32(pb);
00524             if(!(ast->scale && ast->rate)){
00525                 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);
00526                 if(frame_period){
00527                     ast->rate = 1000000;
00528                     ast->scale = frame_period;
00529                 }else{
00530                     ast->rate = 25;
00531                     ast->scale = 1;
00532                 }
00533             }
00534             avpriv_set_pts_info(st, 64, ast->scale, ast->rate);
00535 
00536             ast->cum_len=avio_rl32(pb); /* start */
00537             st->nb_frames = avio_rl32(pb);
00538 
00539             st->start_time = 0;
00540             avio_rl32(pb); /* buffer size */
00541             avio_rl32(pb); /* quality */
00542             if (ast->cum_len*ast->scale/ast->rate > 3600) {
00543                 av_log(s, AV_LOG_ERROR, "crazy start time, iam scared, giving up\n");
00544                 return AVERROR_INVALIDDATA;
00545             }
00546             ast->sample_size = avio_rl32(pb); /* sample ssize */
00547             ast->cum_len *= FFMAX(1, ast->sample_size);
00548 //            av_log(s, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
00549 
00550             switch(tag1) {
00551             case MKTAG('v', 'i', 'd', 's'):
00552                 codec_type = AVMEDIA_TYPE_VIDEO;
00553 
00554                 ast->sample_size = 0;
00555                 break;
00556             case MKTAG('a', 'u', 'd', 's'):
00557                 codec_type = AVMEDIA_TYPE_AUDIO;
00558                 break;
00559             case MKTAG('t', 'x', 't', 's'):
00560                 codec_type = AVMEDIA_TYPE_SUBTITLE;
00561                 break;
00562             case MKTAG('d', 'a', 't', 's'):
00563                 codec_type = AVMEDIA_TYPE_DATA;
00564                 break;
00565             default:
00566                 av_log(s, AV_LOG_INFO, "unknown stream type %X\n", tag1);
00567             }
00568             if(ast->sample_size == 0)
00569                 st->duration = st->nb_frames;
00570             ast->frame_offset= ast->cum_len;
00571             avio_skip(pb, size - 12 * 4);
00572             break;
00573         case MKTAG('s', 't', 'r', 'f'):
00574             /* stream header */
00575             if (!size)
00576                 break;
00577             if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
00578                 avio_skip(pb, size);
00579             } else {
00580                 uint64_t cur_pos = avio_tell(pb);
00581                 unsigned esize;
00582                 if (cur_pos < list_end)
00583                     size = FFMIN(size, list_end - cur_pos);
00584                 st = s->streams[stream_index];
00585                 switch(codec_type) {
00586                 case AVMEDIA_TYPE_VIDEO:
00587                     if(amv_file_format){
00588                         st->codec->width=avih_width;
00589                         st->codec->height=avih_height;
00590                         st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
00591                         st->codec->codec_id = AV_CODEC_ID_AMV;
00592                         avio_skip(pb, size);
00593                         break;
00594                     }
00595                     tag1 = ff_get_bmp_header(pb, st, &esize);
00596 
00597                     if (tag1 == MKTAG('D', 'X', 'S', 'B') || tag1 == MKTAG('D','X','S','A')) {
00598                         st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
00599                         st->codec->codec_tag = tag1;
00600                         st->codec->codec_id = AV_CODEC_ID_XSUB;
00601                         break;
00602                     }
00603 
00604                     if(size > 10*4 && size<(1<<30) && size < avi->fsize){
00605                         if(esize == size-1 && (esize&1)) st->codec->extradata_size= esize - 10*4;
00606                         else                             st->codec->extradata_size=  size - 10*4;
00607                         st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
00608                         if (!st->codec->extradata) {
00609                             st->codec->extradata_size= 0;
00610                             return AVERROR(ENOMEM);
00611                         }
00612                         avio_read(pb, st->codec->extradata, st->codec->extradata_size);
00613                     }
00614 
00615                     if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
00616                         avio_r8(pb);
00617 
00618                     /* Extract palette from extradata if bpp <= 8. */
00619                     /* This code assumes that extradata contains only palette. */
00620                     /* This is true for all paletted codecs implemented in FFmpeg. */
00621                     if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
00622                         int pal_size = (1 << st->codec->bits_per_coded_sample) << 2;
00623                         const uint8_t *pal_src;
00624 
00625                         pal_size = FFMIN(pal_size, st->codec->extradata_size);
00626                         pal_src = st->codec->extradata + st->codec->extradata_size - pal_size;
00627                         for (i = 0; i < pal_size/4; i++)
00628                             ast->pal[i] = 0xFF<<24 | AV_RL32(pal_src+4*i);
00629                         ast->has_pal = 1;
00630                     }
00631 
00632                     print_tag("video", tag1, 0);
00633 
00634                     st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
00635                     st->codec->codec_tag = tag1;
00636                     st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
00637                     st->need_parsing = AVSTREAM_PARSE_HEADERS; // This is needed to get the pict type which is necessary for generating correct pts.
00638 
00639                     if(st->codec->codec_tag==0 && st->codec->height > 0 && st->codec->extradata_size < 1U<<30){
00640                         st->codec->extradata_size+= 9;
00641                         st->codec->extradata= av_realloc_f(st->codec->extradata, 1, st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
00642                         if(st->codec->extradata)
00643                             memcpy(st->codec->extradata + st->codec->extradata_size - 9, "BottomUp", 9);
00644                     }
00645                     st->codec->height= FFABS(st->codec->height);
00646 
00647 //                    avio_skip(pb, size - 5 * 4);
00648                     break;
00649                 case AVMEDIA_TYPE_AUDIO:
00650                     ret = ff_get_wav_header(pb, st->codec, size);
00651                     if (ret < 0)
00652                         return ret;
00653                     ast->dshow_block_align= st->codec->block_align;
00654                     if(ast->sample_size && st->codec->block_align && ast->sample_size != st->codec->block_align){
00655                         av_log(s, AV_LOG_WARNING, "sample size (%d) != block align (%d)\n", ast->sample_size, st->codec->block_align);
00656                         ast->sample_size= st->codec->block_align;
00657                     }
00658                     if (size&1) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
00659                         avio_skip(pb, 1);
00660                     /* Force parsing as several audio frames can be in
00661                      * one packet and timestamps refer to packet start. */
00662                     st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
00663                     /* ADTS header is in extradata, AAC without header must be
00664                      * stored as exact frames. Parser not needed and it will
00665                      * fail. */
00666                     if (st->codec->codec_id == AV_CODEC_ID_AAC && st->codec->extradata_size)
00667                         st->need_parsing = AVSTREAM_PARSE_NONE;
00668                     /* AVI files with Xan DPCM audio (wrongly) declare PCM
00669                      * audio in the header but have Axan as stream_code_tag. */
00670                     if (st->codec->stream_codec_tag == AV_RL32("Axan")){
00671                         st->codec->codec_id  = AV_CODEC_ID_XAN_DPCM;
00672                         st->codec->codec_tag = 0;
00673                         ast->dshow_block_align = 0;
00674                     }
00675                     if (amv_file_format){
00676                         st->codec->codec_id  = AV_CODEC_ID_ADPCM_IMA_AMV;
00677                         ast->dshow_block_align = 0;
00678                     }
00679                     if(st->codec->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align <= 4 && ast->dshow_block_align) {
00680                         av_log(s, AV_LOG_DEBUG, "overriding invalid dshow_block_align of %d\n", ast->dshow_block_align);
00681                         ast->dshow_block_align = 0;
00682                     }
00683                     break;
00684                 case AVMEDIA_TYPE_SUBTITLE:
00685                     st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
00686                     st->request_probe= 1;
00687                     break;
00688                 default:
00689                     st->codec->codec_type = AVMEDIA_TYPE_DATA;
00690                     st->codec->codec_id= AV_CODEC_ID_NONE;
00691                     st->codec->codec_tag= 0;
00692                     avio_skip(pb, size);
00693                     break;
00694                 }
00695             }
00696             break;
00697         case MKTAG('s', 't', 'r', 'd'):
00698             if (stream_index >= (unsigned)s->nb_streams || s->streams[stream_index]->codec->extradata_size) {
00699                 avio_skip(pb, size);
00700             } else {
00701                 uint64_t cur_pos = avio_tell(pb);
00702                 if (cur_pos < list_end)
00703                     size = FFMIN(size, list_end - cur_pos);
00704                 st = s->streams[stream_index];
00705 
00706                 if(size<(1<<30)){
00707                     st->codec->extradata_size= size;
00708                     st->codec->extradata= av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
00709                     if (!st->codec->extradata) {
00710                         st->codec->extradata_size= 0;
00711                         return AVERROR(ENOMEM);
00712                     }
00713                     avio_read(pb, st->codec->extradata, st->codec->extradata_size);
00714                 }
00715 
00716                 if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
00717                     avio_r8(pb);
00718             }
00719             break;
00720         case MKTAG('i', 'n', 'd', 'x'):
00721             i= avio_tell(pb);
00722             if(pb->seekable && !(s->flags & AVFMT_FLAG_IGNIDX) && avi->use_odml &&
00723                read_braindead_odml_indx(s, 0) < 0 && (s->error_recognition & AV_EF_EXPLODE))
00724                 goto fail;
00725             avio_seek(pb, i+size, SEEK_SET);
00726             break;
00727         case MKTAG('v', 'p', 'r', 'p'):
00728             if(stream_index < (unsigned)s->nb_streams && size > 9*4){
00729                 AVRational active, active_aspect;
00730 
00731                 st = s->streams[stream_index];
00732                 avio_rl32(pb);
00733                 avio_rl32(pb);
00734                 avio_rl32(pb);
00735                 avio_rl32(pb);
00736                 avio_rl32(pb);
00737 
00738                 active_aspect.den= avio_rl16(pb);
00739                 active_aspect.num= avio_rl16(pb);
00740                 active.num       = avio_rl32(pb);
00741                 active.den       = avio_rl32(pb);
00742                 avio_rl32(pb); //nbFieldsPerFrame
00743 
00744                 if(active_aspect.num && active_aspect.den && active.num && active.den){
00745                     st->sample_aspect_ratio= av_div_q(active_aspect, active);
00746 //av_log(s, AV_LOG_ERROR, "vprp %d/%d %d/%d\n", active_aspect.num, active_aspect.den, active.num, active.den);
00747                 }
00748                 size -= 9*4;
00749             }
00750             avio_skip(pb, size);
00751             break;
00752         case MKTAG('s', 't', 'r', 'n'):
00753             if(s->nb_streams){
00754                 avi_read_tag(s, s->streams[s->nb_streams-1], tag, size);
00755                 break;
00756             }
00757         default:
00758             if(size > 1000000){
00759                 av_log(s, AV_LOG_ERROR, "Something went wrong during header parsing, "
00760                                         "I will ignore it and try to continue anyway.\n");
00761                 if (s->error_recognition & AV_EF_EXPLODE)
00762                     goto fail;
00763                 avi->movi_list = avio_tell(pb) - 4;
00764                 avi->movi_end  = avi->fsize;
00765                 goto end_of_header;
00766             }
00767             /* skip tag */
00768             size += (size & 1);
00769             avio_skip(pb, size);
00770             break;
00771         }
00772     }
00773  end_of_header:
00774     /* check stream number */
00775     if (stream_index != s->nb_streams - 1) {
00776     fail:
00777         return -1;
00778     }
00779 
00780     if(!avi->index_loaded && pb->seekable)
00781         avi_load_index(s);
00782     avi->index_loaded |= 1;
00783     avi->non_interleaved |= guess_ni_flag(s) | (s->flags & AVFMT_FLAG_SORT_DTS);
00784     for(i=0; i<s->nb_streams; i++){
00785         AVStream *st = s->streams[i];
00786         if(st->nb_index_entries)
00787             break;
00788     }
00789     // DV-in-AVI cannot be non-interleaved, if set this must be
00790     // a mis-detection.
00791     if(avi->dv_demux)
00792         avi->non_interleaved=0;
00793     if(i==s->nb_streams && avi->non_interleaved) {
00794         av_log(s, AV_LOG_WARNING, "non-interleaved AVI without index, switching to interleaved\n");
00795         avi->non_interleaved=0;
00796     }
00797 
00798     if(avi->non_interleaved) {
00799         av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
00800         clean_index(s);
00801     }
00802 
00803     ff_metadata_conv_ctx(s, NULL, avi_metadata_conv);
00804     ff_metadata_conv_ctx(s, NULL, ff_riff_info_conv);
00805 
00806     return 0;
00807 }
00808 
00809 static int read_gab2_sub(AVStream *st, AVPacket *pkt) {
00810     if (!strcmp(pkt->data, "GAB2") && AV_RL16(pkt->data+5) == 2) {
00811         uint8_t desc[256];
00812         int score = AVPROBE_SCORE_MAX / 2, ret;
00813         AVIStream *ast = st->priv_data;
00814         AVInputFormat *sub_demuxer;
00815         AVRational time_base;
00816         AVIOContext *pb = avio_alloc_context( pkt->data + 7,
00817                                               pkt->size - 7,
00818                                               0, NULL, NULL, NULL, NULL);
00819         AVProbeData pd;
00820         unsigned int desc_len = avio_rl32(pb);
00821 
00822         if (desc_len > pb->buf_end - pb->buf_ptr)
00823             goto error;
00824 
00825         ret = avio_get_str16le(pb, desc_len, desc, sizeof(desc));
00826         avio_skip(pb, desc_len - ret);
00827         if (*desc)
00828             av_dict_set(&st->metadata, "title", desc, 0);
00829 
00830         avio_rl16(pb);   /* flags? */
00831         avio_rl32(pb);   /* data size */
00832 
00833         pd = (AVProbeData) { .buf = pb->buf_ptr, .buf_size = pb->buf_end - pb->buf_ptr };
00834         if (!(sub_demuxer = av_probe_input_format2(&pd, 1, &score)))
00835             goto error;
00836 
00837         if (!(ast->sub_ctx = avformat_alloc_context()))
00838             goto error;
00839 
00840         ast->sub_ctx->pb      = pb;
00841         if (!avformat_open_input(&ast->sub_ctx, "", sub_demuxer, NULL)) {
00842             ff_read_packet(ast->sub_ctx, &ast->sub_pkt);
00843             *st->codec = *ast->sub_ctx->streams[0]->codec;
00844             ast->sub_ctx->streams[0]->codec->extradata = NULL;
00845             time_base = ast->sub_ctx->streams[0]->time_base;
00846             avpriv_set_pts_info(st, 64, time_base.num, time_base.den);
00847         }
00848         ast->sub_buffer = pkt->data;
00849         memset(pkt, 0, sizeof(*pkt));
00850         return 1;
00851 error:
00852         av_freep(&pb);
00853     }
00854     return 0;
00855 }
00856 
00857 static AVStream *get_subtitle_pkt(AVFormatContext *s, AVStream *next_st,
00858                                   AVPacket *pkt)
00859 {
00860     AVIStream *ast, *next_ast = next_st->priv_data;
00861     int64_t ts, next_ts, ts_min = INT64_MAX;
00862     AVStream *st, *sub_st = NULL;
00863     int i;
00864 
00865     next_ts = av_rescale_q(next_ast->frame_offset, next_st->time_base,
00866                            AV_TIME_BASE_Q);
00867 
00868     for (i=0; i<s->nb_streams; i++) {
00869         st  = s->streams[i];
00870         ast = st->priv_data;
00871         if (st->discard < AVDISCARD_ALL && ast && ast->sub_pkt.data) {
00872             ts = av_rescale_q(ast->sub_pkt.dts, st->time_base, AV_TIME_BASE_Q);
00873             if (ts <= next_ts && ts < ts_min) {
00874                 ts_min = ts;
00875                 sub_st = st;
00876             }
00877         }
00878     }
00879 
00880     if (sub_st) {
00881         ast = sub_st->priv_data;
00882         *pkt = ast->sub_pkt;
00883         pkt->stream_index = sub_st->index;
00884         if (ff_read_packet(ast->sub_ctx, &ast->sub_pkt) < 0)
00885             ast->sub_pkt.data = NULL;
00886     }
00887     return sub_st;
00888 }
00889 
00890 static int get_stream_idx(int *d){
00891     if(    d[0] >= '0' && d[0] <= '9'
00892         && d[1] >= '0' && d[1] <= '9'){
00893         return (d[0] - '0') * 10 + (d[1] - '0');
00894     }else{
00895         return 100; //invalid stream ID
00896     }
00897 }
00898 
00903 static int avi_sync(AVFormatContext *s, int exit_early)
00904 {
00905     AVIContext *avi = s->priv_data;
00906     AVIOContext *pb = s->pb;
00907     int n;
00908     unsigned int d[8];
00909     unsigned int size;
00910     int64_t i, sync;
00911 
00912 start_sync:
00913     memset(d, -1, sizeof(d));
00914     for(i=sync=avio_tell(pb); !url_feof(pb); i++) {
00915         int j;
00916 
00917         for(j=0; j<7; j++)
00918             d[j]= d[j+1];
00919         d[7]= avio_r8(pb);
00920 
00921         size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
00922 
00923         n= get_stream_idx(d+2);
00924 //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);
00925         if(i + (uint64_t)size > avi->fsize || d[0] > 127)
00926             continue;
00927 
00928         //parse ix##
00929         if(  (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
00930         //parse JUNK
00931            ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')
00932            ||(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')){
00933             avio_skip(pb, size);
00934 //av_log(s, AV_LOG_DEBUG, "SKIP\n");
00935             goto start_sync;
00936         }
00937 
00938         //parse stray LIST
00939         if(d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T'){
00940             avio_skip(pb, 4);
00941             goto start_sync;
00942         }
00943 
00944         n= get_stream_idx(d);
00945 
00946         if(!((i-avi->last_pkt_pos)&1) && get_stream_idx(d+1) < s->nb_streams)
00947             continue;
00948 
00949         //detect ##ix chunk and skip
00950         if(d[2] == 'i' && d[3] == 'x' && n < s->nb_streams){
00951             avio_skip(pb, size);
00952             goto start_sync;
00953         }
00954 
00955         //parse ##dc/##wb
00956         if(n < s->nb_streams){
00957             AVStream *st;
00958             AVIStream *ast;
00959             st = s->streams[n];
00960             ast = st->priv_data;
00961 
00962             if (!ast) {
00963                 av_log(s, AV_LOG_WARNING, "Skiping foreign stream %d packet\n", n);
00964                 continue;
00965             }
00966 
00967             if(s->nb_streams>=2){
00968                 AVStream *st1  = s->streams[1];
00969                 AVIStream *ast1= st1->priv_data;
00970                 //workaround for broken small-file-bug402.avi
00971                 if(   d[2] == 'w' && d[3] == 'b'
00972                    && n==0
00973                    && st ->codec->codec_type == AVMEDIA_TYPE_VIDEO
00974                    && st1->codec->codec_type == AVMEDIA_TYPE_AUDIO
00975                    && ast->prefix == 'd'*256+'c'
00976                    && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
00977                   ){
00978                     n=1;
00979                     st = st1;
00980                     ast = ast1;
00981                     av_log(s, AV_LOG_WARNING, "Invalid stream + prefix combination, assuming audio.\n");
00982                 }
00983             }
00984 
00985 
00986             if(   (st->discard >= AVDISCARD_DEFAULT && size==0)
00987                /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & AV_PKT_FLAG_KEY))*/ //FIXME needs a little reordering
00988                || st->discard >= AVDISCARD_ALL){
00989                 if (!exit_early) {
00990                     ast->frame_offset += get_duration(ast, size);
00991                 }
00992                 avio_skip(pb, size);
00993                 goto start_sync;
00994             }
00995 
00996             if (d[2] == 'p' && d[3] == 'c' && size<=4*256+4) {
00997                 int k = avio_r8(pb);
00998                 int last = (k + avio_r8(pb) - 1) & 0xFF;
00999 
01000                 avio_rl16(pb); //flags
01001 
01002                 for (; k <= last; k++)
01003                     ast->pal[k] = 0xFF<<24 | avio_rb32(pb)>>8;// b + (g << 8) + (r << 16);
01004                 ast->has_pal= 1;
01005                 goto start_sync;
01006             } else if(   ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
01007                          d[2]*256+d[3] == ast->prefix /*||
01008                          (d[2] == 'd' && d[3] == 'c') ||
01009                          (d[2] == 'w' && d[3] == 'b')*/) {
01010 
01011                 if (exit_early)
01012                     return 0;
01013 //av_log(s, AV_LOG_DEBUG, "OK\n");
01014                 if(d[2]*256+d[3] == ast->prefix)
01015                     ast->prefix_count++;
01016                 else{
01017                     ast->prefix= d[2]*256+d[3];
01018                     ast->prefix_count= 0;
01019                 }
01020 
01021                 avi->stream_index= n;
01022                 ast->packet_size= size + 8;
01023                 ast->remaining= size;
01024 
01025                 if(size || !ast->sample_size){
01026                     uint64_t pos= avio_tell(pb) - 8;
01027                     if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){
01028                         av_add_index_entry(st, pos, ast->frame_offset, size, 0, AVINDEX_KEYFRAME);
01029                     }
01030                 }
01031                 return 0;
01032             }
01033         }
01034     }
01035 
01036     if(pb->error)
01037         return pb->error;
01038     return AVERROR_EOF;
01039 }
01040 
01041 static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
01042 {
01043     AVIContext *avi = s->priv_data;
01044     AVIOContext *pb = s->pb;
01045     int err;
01046     void* dstr;
01047 
01048     if (CONFIG_DV_DEMUXER && avi->dv_demux) {
01049         int size = avpriv_dv_get_packet(avi->dv_demux, pkt);
01050         if (size >= 0)
01051             return size;
01052     }
01053 
01054     if(avi->non_interleaved){
01055         int best_stream_index = 0;
01056         AVStream *best_st= NULL;
01057         AVIStream *best_ast;
01058         int64_t best_ts= INT64_MAX;
01059         int i;
01060 
01061         for(i=0; i<s->nb_streams; i++){
01062             AVStream *st = s->streams[i];
01063             AVIStream *ast = st->priv_data;
01064             int64_t ts= ast->frame_offset;
01065             int64_t last_ts;
01066 
01067             if(!st->nb_index_entries)
01068                 continue;
01069 
01070             last_ts = st->index_entries[st->nb_index_entries - 1].timestamp;
01071             if(!ast->remaining && ts > last_ts)
01072                 continue;
01073 
01074             ts = av_rescale_q(ts, st->time_base, (AVRational){FFMAX(1, ast->sample_size), AV_TIME_BASE});
01075 
01076 //            av_log(s, AV_LOG_DEBUG, "%"PRId64" %d/%d %"PRId64"\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
01077             if(ts < best_ts){
01078                 best_ts= ts;
01079                 best_st= st;
01080                 best_stream_index= i;
01081             }
01082         }
01083         if(!best_st)
01084             return AVERROR_EOF;
01085 
01086         best_ast = best_st->priv_data;
01087         best_ts = best_ast->frame_offset;
01088         if(best_ast->remaining)
01089             i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
01090         else{
01091             i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
01092             if(i>=0)
01093                 best_ast->frame_offset= best_st->index_entries[i].timestamp;
01094         }
01095 
01096 //        av_log(s, AV_LOG_DEBUG, "%d\n", i);
01097         if(i>=0){
01098             int64_t pos= best_st->index_entries[i].pos;
01099             pos += best_ast->packet_size - best_ast->remaining;
01100             if(avio_seek(s->pb, pos + 8, SEEK_SET) < 0)
01101               return AVERROR_EOF;
01102 //        av_log(s, AV_LOG_DEBUG, "pos=%"PRId64"\n", pos);
01103 
01104             av_assert0(best_ast->remaining <= best_ast->packet_size);
01105 
01106             avi->stream_index= best_stream_index;
01107             if(!best_ast->remaining)
01108                 best_ast->packet_size=
01109                 best_ast->remaining= best_st->index_entries[i].size;
01110         }
01111         else
01112           return AVERROR_EOF;
01113     }
01114 
01115 resync:
01116     if(avi->stream_index >= 0){
01117         AVStream *st= s->streams[ avi->stream_index ];
01118         AVIStream *ast= st->priv_data;
01119         int size, err;
01120 
01121         if(get_subtitle_pkt(s, st, pkt))
01122             return 0;
01123 
01124         if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
01125             size= INT_MAX;
01126         else if(ast->sample_size < 32)
01127             // arbitrary multiplier to avoid tiny packets for raw PCM data
01128             size= 1024*ast->sample_size;
01129         else
01130             size= ast->sample_size;
01131 
01132         if(size > ast->remaining)
01133             size= ast->remaining;
01134         avi->last_pkt_pos= avio_tell(pb);
01135         err= av_get_packet(pb, pkt, size);
01136         if(err<0)
01137             return err;
01138         size = err;
01139 
01140         if(ast->has_pal && pkt->data && pkt->size<(unsigned)INT_MAX/2){
01141             uint8_t *pal;
01142             pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, AVPALETTE_SIZE);
01143             if(!pal){
01144                 av_log(s, AV_LOG_ERROR, "Failed to allocate data for palette\n");
01145             }else{
01146                 memcpy(pal, ast->pal, AVPALETTE_SIZE);
01147                 ast->has_pal = 0;
01148             }
01149         }
01150 
01151         if (CONFIG_DV_DEMUXER && avi->dv_demux) {
01152             dstr = pkt->destruct;
01153             size = avpriv_dv_produce_packet(avi->dv_demux, pkt,
01154                                     pkt->data, pkt->size, pkt->pos);
01155             pkt->destruct = dstr;
01156             pkt->flags |= AV_PKT_FLAG_KEY;
01157             if (size < 0)
01158                 av_free_packet(pkt);
01159         } else if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE
01160                    && !st->codec->codec_tag && read_gab2_sub(st, pkt)) {
01161             ast->frame_offset++;
01162             avi->stream_index = -1;
01163             ast->remaining = 0;
01164             goto resync;
01165         } else {
01166             /* XXX: How to handle B-frames in AVI? */
01167             pkt->dts = ast->frame_offset;
01168 //                pkt->dts += ast->start;
01169             if(ast->sample_size)
01170                 pkt->dts /= ast->sample_size;
01171 //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);
01172             pkt->stream_index = avi->stream_index;
01173 
01174             if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
01175                 AVIndexEntry *e;
01176                 int index;
01177                 av_assert0(st->index_entries);
01178 
01179                 index= av_index_search_timestamp(st, ast->frame_offset, 0);
01180                 e= &st->index_entries[index];
01181 
01182                 if(index >= 0 && e->timestamp == ast->frame_offset){
01183                     if (index == st->nb_index_entries-1){
01184                         int key=1;
01185                         int i;
01186                         uint32_t state=-1;
01187                         for(i=0; i<FFMIN(size,256); i++){
01188                             if(st->codec->codec_id == AV_CODEC_ID_MPEG4){
01189                                 if(state == 0x1B6){
01190                                     key= !(pkt->data[i]&0xC0);
01191                                     break;
01192                                 }
01193                             }else
01194                                 break;
01195                             state= (state<<8) + pkt->data[i];
01196                         }
01197                         if(!key)
01198                             e->flags &= ~AVINDEX_KEYFRAME;
01199                     }
01200                     if (e->flags & AVINDEX_KEYFRAME)
01201                         pkt->flags |= AV_PKT_FLAG_KEY;
01202                 }
01203             } else {
01204                 pkt->flags |= AV_PKT_FLAG_KEY;
01205             }
01206             ast->frame_offset += get_duration(ast, pkt->size);
01207         }
01208         ast->remaining -= size;
01209         if(!ast->remaining){
01210             avi->stream_index= -1;
01211             ast->packet_size= 0;
01212         }
01213 
01214         if(!avi->non_interleaved && pkt->pos >= 0 && ast->seek_pos > pkt->pos){
01215             av_free_packet(pkt);
01216             goto resync;
01217         }
01218         ast->seek_pos= 0;
01219 
01220         if(!avi->non_interleaved && st->nb_index_entries>1 && avi->index_loaded>1){
01221             int64_t dts= av_rescale_q(pkt->dts, st->time_base, AV_TIME_BASE_Q);
01222 
01223             if(avi->dts_max - dts > 2*AV_TIME_BASE){
01224                 avi->non_interleaved= 1;
01225                 av_log(s, AV_LOG_INFO, "Switching to NI mode, due to poor interleaving\n");
01226             }else if(avi->dts_max < dts)
01227                 avi->dts_max = dts;
01228         }
01229 
01230         return size;
01231     }
01232 
01233     if ((err = avi_sync(s, 0)) < 0)
01234         return err;
01235     goto resync;
01236 }
01237 
01238 /* XXX: We make the implicit supposition that the positions are sorted
01239    for each stream. */
01240 static int avi_read_idx1(AVFormatContext *s, int size)
01241 {
01242     AVIContext *avi = s->priv_data;
01243     AVIOContext *pb = s->pb;
01244     int nb_index_entries, i;
01245     AVStream *st;
01246     AVIStream *ast;
01247     unsigned int index, tag, flags, pos, len, first_packet = 1;
01248     unsigned last_pos= -1;
01249     unsigned last_idx= -1;
01250     int64_t idx1_pos, first_packet_pos = 0, data_offset = 0;
01251     int anykey = 0;
01252 
01253     nb_index_entries = size / 16;
01254     if (nb_index_entries <= 0)
01255         return -1;
01256 
01257     idx1_pos = avio_tell(pb);
01258     avio_seek(pb, avi->movi_list+4, SEEK_SET);
01259     if (avi_sync(s, 1) == 0) {
01260         first_packet_pos = avio_tell(pb) - 8;
01261     }
01262     avi->stream_index = -1;
01263     avio_seek(pb, idx1_pos, SEEK_SET);
01264 
01265     /* Read the entries and sort them in each stream component. */
01266     for(i = 0; i < nb_index_entries; i++) {
01267         if(url_feof(pb))
01268             return -1;
01269 
01270         tag = avio_rl32(pb);
01271         flags = avio_rl32(pb);
01272         pos = avio_rl32(pb);
01273         len = avio_rl32(pb);
01274         av_dlog(s, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
01275                 i, tag, flags, pos, len);
01276 
01277         index = ((tag & 0xff) - '0') * 10;
01278         index += ((tag >> 8) & 0xff) - '0';
01279         if (index >= s->nb_streams)
01280             continue;
01281         st = s->streams[index];
01282         ast = st->priv_data;
01283 
01284         if(first_packet && first_packet_pos && len) {
01285             data_offset = first_packet_pos - pos;
01286             first_packet = 0;
01287         }
01288         pos += data_offset;
01289 
01290         av_dlog(s, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
01291 
01292 
01293         // even if we have only a single stream, we should
01294         // switch to non-interleaved to get correct timestamps
01295         if(last_pos == pos)
01296             avi->non_interleaved= 1;
01297         if(last_idx != pos && len) {
01298             av_add_index_entry(st, pos, ast->cum_len, len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
01299             last_idx= pos;
01300         }
01301         ast->cum_len += get_duration(ast, len);
01302         last_pos= pos;
01303         anykey |= flags&AVIIF_INDEX;
01304     }
01305     if (!anykey) {
01306         for (index = 0; index < s->nb_streams; index++) {
01307             st = s->streams[index];
01308             if (st->nb_index_entries)
01309                 st->index_entries[0].flags |= AVINDEX_KEYFRAME;
01310         }
01311     }
01312     return 0;
01313 }
01314 
01315 static int guess_ni_flag(AVFormatContext *s){
01316     int i;
01317     int64_t last_start=0;
01318     int64_t first_end= INT64_MAX;
01319     int64_t oldpos= avio_tell(s->pb);
01320     int *idx;
01321     int64_t min_pos, pos;
01322 
01323     for(i=0; i<s->nb_streams; i++){
01324         AVStream *st = s->streams[i];
01325         int n= st->nb_index_entries;
01326         unsigned int size;
01327 
01328         if(n <= 0)
01329             continue;
01330 
01331         if(n >= 2){
01332             int64_t pos= st->index_entries[0].pos;
01333             avio_seek(s->pb, pos + 4, SEEK_SET);
01334             size= avio_rl32(s->pb);
01335             if(pos + size > st->index_entries[1].pos)
01336                 last_start= INT64_MAX;
01337         }
01338 
01339         if(st->index_entries[0].pos > last_start)
01340             last_start= st->index_entries[0].pos;
01341         if(st->index_entries[n-1].pos < first_end)
01342             first_end= st->index_entries[n-1].pos;
01343     }
01344     avio_seek(s->pb, oldpos, SEEK_SET);
01345     if (last_start > first_end)
01346         return 1;
01347     idx= av_mallocz(sizeof(*idx) * s->nb_streams);
01348     for (min_pos=pos=0; min_pos!=INT64_MAX; pos= min_pos+1LU) {
01349         int64_t max_dts = INT64_MIN/2, min_dts= INT64_MAX/2;
01350         min_pos = INT64_MAX;
01351 
01352         for (i=0; i<s->nb_streams; i++) {
01353             AVStream *st = s->streams[i];
01354             int n= st->nb_index_entries;
01355             while (idx[i]<n && st->index_entries[idx[i]].pos < pos)
01356                 idx[i]++;
01357             if (idx[i] < n) {
01358                 min_dts = FFMIN(min_dts, av_rescale_q(st->index_entries[idx[i]].timestamp, st->time_base, AV_TIME_BASE_Q));
01359                 min_pos = FFMIN(min_pos, st->index_entries[idx[i]].pos);
01360             }
01361             if (idx[i])
01362                 max_dts = FFMAX(max_dts, av_rescale_q(st->index_entries[idx[i]-1].timestamp, st->time_base, AV_TIME_BASE_Q));
01363         }
01364         if(max_dts - min_dts > 2*AV_TIME_BASE) {
01365             av_free(idx);
01366             return 1;
01367         }
01368     }
01369     av_free(idx);
01370     return 0;
01371 }
01372 
01373 static int avi_load_index(AVFormatContext *s)
01374 {
01375     AVIContext *avi = s->priv_data;
01376     AVIOContext *pb = s->pb;
01377     uint32_t tag, size;
01378     int64_t pos= avio_tell(pb);
01379     int64_t next;
01380     int ret = -1;
01381 
01382     if (avio_seek(pb, avi->movi_end, SEEK_SET) < 0)
01383         goto the_end; // maybe truncated file
01384     av_dlog(s, "movi_end=0x%"PRIx64"\n", avi->movi_end);
01385     for(;;) {
01386         tag = avio_rl32(pb);
01387         size = avio_rl32(pb);
01388         if (url_feof(pb))
01389             break;
01390         next = avio_tell(pb) + size + (size & 1);
01391 
01392         av_dlog(s, "tag=%c%c%c%c size=0x%x\n",
01393                  tag        & 0xff,
01394                 (tag >>  8) & 0xff,
01395                 (tag >> 16) & 0xff,
01396                 (tag >> 24) & 0xff,
01397                 size);
01398 
01399         if (tag == MKTAG('i', 'd', 'x', '1') &&
01400             avi_read_idx1(s, size) >= 0) {
01401             avi->index_loaded=2;
01402             ret = 0;
01403         }else if(tag == MKTAG('L', 'I', 'S', 'T')) {
01404             uint32_t tag1 = avio_rl32(pb);
01405 
01406             if (tag1 == MKTAG('I', 'N', 'F', 'O'))
01407                 ff_read_riff_info(s, size - 4);
01408         }else if(!ret)
01409             break;
01410 
01411         if (avio_seek(pb, next, SEEK_SET) < 0)
01412             break; // something is wrong here
01413     }
01414  the_end:
01415     avio_seek(pb, pos, SEEK_SET);
01416     return ret;
01417 }
01418 
01419 static void seek_subtitle(AVStream *st, AVStream *st2, int64_t timestamp)
01420 {
01421     AVIStream *ast2 = st2->priv_data;
01422     int64_t ts2 = av_rescale_q(timestamp, st->time_base, st2->time_base);
01423     av_free_packet(&ast2->sub_pkt);
01424     if (avformat_seek_file(ast2->sub_ctx, 0, INT64_MIN, ts2, ts2, 0) >= 0 ||
01425         avformat_seek_file(ast2->sub_ctx, 0, ts2, ts2, INT64_MAX, 0) >= 0)
01426         ff_read_packet(ast2->sub_ctx, &ast2->sub_pkt);
01427 }
01428 
01429 static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
01430 {
01431     AVIContext *avi = s->priv_data;
01432     AVStream *st;
01433     int i, index;
01434     int64_t pos, pos_min;
01435     AVIStream *ast;
01436 
01437     if (!avi->index_loaded) {
01438         /* we only load the index on demand */
01439         avi_load_index(s);
01440         avi->index_loaded |= 1;
01441     }
01442     av_assert0(stream_index>= 0);
01443 
01444     st = s->streams[stream_index];
01445     ast= st->priv_data;
01446     index= av_index_search_timestamp(st, timestamp * FFMAX(ast->sample_size, 1), flags);
01447     if (index<0) {
01448         if (st->nb_index_entries > 0)
01449             av_log(s, AV_LOG_DEBUG, "Failed to find timestamp %"PRId64 " in index %"PRId64 " .. %"PRId64 "\n",
01450                    timestamp * FFMAX(ast->sample_size, 1),
01451                    st->index_entries[0].timestamp,
01452                    st->index_entries[st->nb_index_entries - 1].timestamp);
01453         return -1;
01454     }
01455 
01456     /* find the position */
01457     pos = st->index_entries[index].pos;
01458     timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1);
01459 
01460 //    av_log(s, AV_LOG_DEBUG, "XX %"PRId64" %d %"PRId64"\n", timestamp, index, st->index_entries[index].timestamp);
01461 
01462     if (CONFIG_DV_DEMUXER && avi->dv_demux) {
01463         /* One and only one real stream for DV in AVI, and it has video  */
01464         /* offsets. Calling with other stream indexes should have failed */
01465         /* the av_index_search_timestamp call above.                     */
01466         av_assert0(stream_index == 0);
01467 
01468         if(avio_seek(s->pb, pos, SEEK_SET) < 0)
01469             return -1;
01470 
01471         /* Feed the DV video stream version of the timestamp to the */
01472         /* DV demux so it can synthesize correct timestamps.        */
01473         ff_dv_offset_reset(avi->dv_demux, timestamp);
01474 
01475         avi->stream_index= -1;
01476         return 0;
01477     }
01478 
01479     pos_min= pos;
01480     for(i = 0; i < s->nb_streams; i++) {
01481         AVStream *st2 = s->streams[i];
01482         AVIStream *ast2 = st2->priv_data;
01483 
01484         ast2->packet_size=
01485         ast2->remaining= 0;
01486 
01487         if (ast2->sub_ctx) {
01488             seek_subtitle(st, st2, timestamp);
01489             continue;
01490         }
01491 
01492         if (st2->nb_index_entries <= 0)
01493             continue;
01494 
01495 //        av_assert1(st2->codec->block_align);
01496         av_assert0((int64_t)st2->time_base.num*ast2->rate == (int64_t)st2->time_base.den*ast2->scale);
01497         index = av_index_search_timestamp(
01498                 st2,
01499                 av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
01500                 flags | AVSEEK_FLAG_BACKWARD | (st2->codec->codec_type != AVMEDIA_TYPE_VIDEO ? AVSEEK_FLAG_ANY : 0));
01501         if(index<0)
01502             index=0;
01503         ast2->seek_pos= st2->index_entries[index].pos;
01504         pos_min= FFMIN(pos_min,ast2->seek_pos);
01505     }
01506     for(i = 0; i < s->nb_streams; i++) {
01507         AVStream *st2 = s->streams[i];
01508         AVIStream *ast2 = st2->priv_data;
01509 
01510         if (ast2->sub_ctx || st2->nb_index_entries <= 0)
01511             continue;
01512 
01513         index = av_index_search_timestamp(
01514                 st2,
01515                 av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
01516                 flags | AVSEEK_FLAG_BACKWARD | (st2->codec->codec_type != AVMEDIA_TYPE_VIDEO ? AVSEEK_FLAG_ANY : 0));
01517         if(index<0)
01518             index=0;
01519         while(!avi->non_interleaved && index>0 && st2->index_entries[index-1].pos >= pos_min)
01520             index--;
01521         ast2->frame_offset = st2->index_entries[index].timestamp;
01522     }
01523 
01524     /* do the seek */
01525     if (avio_seek(s->pb, pos_min, SEEK_SET) < 0) {
01526         av_log(s, AV_LOG_ERROR, "Seek failed\n");
01527         return -1;
01528     }
01529     avi->stream_index= -1;
01530     avi->dts_max= INT_MIN;
01531     return 0;
01532 }
01533 
01534 static int avi_read_close(AVFormatContext *s)
01535 {
01536     int i;
01537     AVIContext *avi = s->priv_data;
01538 
01539     for(i=0;i<s->nb_streams;i++) {
01540         AVStream *st = s->streams[i];
01541         AVIStream *ast = st->priv_data;
01542         if (ast) {
01543             if (ast->sub_ctx) {
01544                 av_freep(&ast->sub_ctx->pb);
01545                 avformat_close_input(&ast->sub_ctx);
01546             }
01547             av_free(ast->sub_buffer);
01548             av_free_packet(&ast->sub_pkt);
01549         }
01550     }
01551 
01552     av_free(avi->dv_demux);
01553 
01554     return 0;
01555 }
01556 
01557 static int avi_probe(AVProbeData *p)
01558 {
01559     int i;
01560 
01561     /* check file header */
01562     for(i=0; avi_headers[i][0]; i++)
01563         if(!memcmp(p->buf  , avi_headers[i]  , 4) &&
01564            !memcmp(p->buf+8, avi_headers[i]+4, 4))
01565             return AVPROBE_SCORE_MAX;
01566 
01567     return 0;
01568 }
01569 
01570 AVInputFormat ff_avi_demuxer = {
01571     .name           = "avi",
01572     .long_name      = NULL_IF_CONFIG_SMALL("AVI (Audio Video Interleaved)"),
01573     .priv_data_size = sizeof(AVIContext),
01574     .read_probe     = avi_probe,
01575     .read_header    = avi_read_header,
01576     .read_packet    = avi_read_packet,
01577     .read_close     = avi_read_close,
01578     .read_seek      = avi_read_seek,
01579     .priv_class = &demuxer_class,
01580 };