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 "avformat.h"
00029 #include "internal.h"
00030 #include "avi.h"
00031 #include "dv.h"
00032 #include "riff.h"
00033 
00034 #undef NDEBUG
00035 #include <assert.h>
00036 
00037 typedef struct AVIStream {
00038     int64_t frame_offset; /* current frame (video) or byte (audio) counter
00039                          (used to compute the pts) */
00040     int remaining;
00041     int packet_size;
00042 
00043     int scale;
00044     int rate;
00045     int sample_size; /* size of one sample (or packet) (in the rate/scale sense) in bytes */
00046 
00047     int64_t cum_len; /* temporary storage (used during seek) */
00048 
00049     int prefix;                       
00050     int prefix_count;
00051     uint32_t pal[256];
00052     int has_pal;
00053     int dshow_block_align;            
00054 
00055     AVFormatContext *sub_ctx;
00056     AVPacket sub_pkt;
00057     uint8_t *sub_buffer;
00058 
00059     int64_t seek_pos;
00060 } AVIStream;
00061 
00062 typedef struct {
00063     const AVClass *class;
00064     int64_t  riff_end;
00065     int64_t  movi_end;
00066     int64_t  fsize;
00067     int64_t movi_list;
00068     int64_t last_pkt_pos;
00069     int index_loaded;
00070     int is_odml;
00071     int non_interleaved;
00072     int stream_index;
00073     DVDemuxContext* dv_demux;
00074     int odml_depth;
00075     int use_odml;
00076 #define MAX_ODML_DEPTH 1000
00077     int64_t dts_max;
00078 } AVIContext;
00079 
00080 
00081 static const AVOption options[] = {
00082     { "use_odml", "use odml index", offsetof(AVIContext, use_odml), AV_OPT_TYPE_INT, {.dbl = 1}, -1, 1, AV_OPT_FLAG_DECODING_PARAM},
00083     { NULL },
00084 };
00085 
00086 static const AVClass demuxer_class = {
00087     "AVI demuxer",
00088     av_default_item_name,
00089     options,
00090     LIBAVUTIL_VERSION_INT,
00091 };
00092 
00093 
00094 static const char avi_headers[][8] = {
00095     { 'R', 'I', 'F', 'F',    'A', 'V', 'I', ' ' },
00096     { 'R', 'I', 'F', 'F',    'A', 'V', 'I', 'X' },
00097     { 'R', 'I', 'F', 'F',    'A', 'V', 'I', 0x19},
00098     { 'O', 'N', '2', ' ',    'O', 'N', '2', 'f' },
00099     { 'R', 'I', 'F', 'F',    'A', 'M', 'V', ' ' },
00100     { 0 }
00101 };
00102 
00103 static const AVMetadataConv avi_metadata_conv[] = {
00104     { "strn", "title" },
00105     { 0 },
00106 };
00107 
00108 static int avi_load_index(AVFormatContext *s);
00109 static int guess_ni_flag(AVFormatContext *s);
00110 
00111 #define print_tag(str, tag, size)                       \
00112     av_dlog(NULL, "%s: tag=%c%c%c%c size=0x%x\n",       \
00113            str, tag & 0xff,                             \
00114            (tag >> 8) & 0xff,                           \
00115            (tag >> 16) & 0xff,                          \
00116            (tag >> 24) & 0xff,                          \
00117            size)
00118 
00119 static inline int get_duration(AVIStream *ast, int len){
00120     if(ast->sample_size){
00121         return len;
00122     }else if (ast->dshow_block_align){
00123         return (len + ast->dshow_block_align - 1)/ast->dshow_block_align;
00124     }else
00125         return 1;
00126 }
00127 
00128 static int get_riff(AVFormatContext *s, AVIOContext *pb)
00129 {
00130     AVIContext *avi = s->priv_data;
00131     char header[8];
00132     int i;
00133 
00134     /* check RIFF header */
00135     avio_read(pb, header, 4);
00136     avi->riff_end = avio_rl32(pb);  /* RIFF chunk size */
00137     avi->riff_end += avio_tell(pb); /* RIFF chunk end */
00138     avio_read(pb, header+4, 4);
00139 
00140     for(i=0; avi_headers[i][0]; i++)
00141         if(!memcmp(header, avi_headers[i], 8))
00142             break;
00143     if(!avi_headers[i][0])
00144         return -1;
00145 
00146     if(header[7] == 0x19)
00147         av_log(s, AV_LOG_INFO, "This file has been generated by a totally broken muxer.\n");
00148 
00149     return 0;
00150 }
00151 
00152 static int read_braindead_odml_indx(AVFormatContext *s, int frame_num){
00153     AVIContext *avi = s->priv_data;
00154     AVIOContext *pb = s->pb;
00155     int longs_pre_entry= avio_rl16(pb);
00156     int index_sub_type = avio_r8(pb);
00157     int index_type     = avio_r8(pb);
00158     int entries_in_use = avio_rl32(pb);
00159     int chunk_id       = avio_rl32(pb);
00160     int64_t base       = avio_rl64(pb);
00161     int stream_id= 10*((chunk_id&0xFF) - '0') + (((chunk_id>>8)&0xFF) - '0');
00162     AVStream *st;
00163     AVIStream *ast;
00164     int i;
00165     int64_t last_pos= -1;
00166     int64_t filesize= avi->fsize;
00167 
00168     av_dlog(s, "longs_pre_entry:%d index_type:%d entries_in_use:%d chunk_id:%X base:%16"PRIX64"\n",
00169             longs_pre_entry,index_type, entries_in_use, chunk_id, base);
00170 
00171     if(stream_id >= s->nb_streams || stream_id < 0)
00172         return -1;
00173     st= s->streams[stream_id];
00174     ast = st->priv_data;
00175 
00176     if(index_sub_type)
00177         return -1;
00178 
00179     avio_rl32(pb);
00180 
00181     if(index_type && longs_pre_entry != 2)
00182         return -1;
00183     if(index_type>1)
00184         return -1;
00185 
00186     if(filesize > 0 && base >= filesize){
00187         av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
00188         if(base>>32 == (base & 0xFFFFFFFF) && (base & 0xFFFFFFFF) < filesize && filesize <= 0xFFFFFFFF)
00189             base &= 0xFFFFFFFF;
00190         else
00191             return -1;
00192     }
00193 
00194     for(i=0; i<entries_in_use; i++){
00195         if(index_type){
00196             int64_t pos= avio_rl32(pb) + base - 8;
00197             int len    = avio_rl32(pb);
00198             int key= len >= 0;
00199             len &= 0x7FFFFFFF;
00200 
00201 #ifdef DEBUG_SEEK
00202             av_log(s, AV_LOG_ERROR, "pos:%"PRId64", len:%X\n", pos, len);
00203 #endif
00204             if(url_feof(pb))
00205                 return -1;
00206 
00207             if(last_pos == pos || pos == base - 8)
00208                 avi->non_interleaved= 1;
00209             if(last_pos != pos && (len || !ast->sample_size))
00210                 av_add_index_entry(st, pos, ast->cum_len, len, 0, key ? AVINDEX_KEYFRAME : 0);
00211 
00212             ast->cum_len += get_duration(ast, len);
00213             last_pos= pos;
00214         }else{
00215             int64_t offset, pos;
00216             int duration;
00217             offset = avio_rl64(pb);
00218             avio_rl32(pb);       /* size */
00219             duration = avio_rl32(pb);
00220 
00221             if(url_feof(pb))
00222                 return -1;
00223 
00224             pos = avio_tell(pb);
00225 
00226             if(avi->odml_depth > MAX_ODML_DEPTH){
00227                 av_log(s, AV_LOG_ERROR, "Too deeply nested ODML indexes\n");
00228                 return -1;
00229             }
00230 
00231             if(avio_seek(pb, offset+8, SEEK_SET) < 0)
00232                 return -1;
00233             avi->odml_depth++;
00234             read_braindead_odml_indx(s, frame_num);
00235             avi->odml_depth--;
00236             frame_num += duration;
00237 
00238             if(avio_seek(pb, pos, SEEK_SET) < 0) {
00239                 av_log(s, AV_LOG_ERROR, "Failed to restore position after reading index");
00240                 return -1;
00241             }
00242 
00243         }
00244     }
00245     avi->index_loaded=2;
00246     return 0;
00247 }
00248 
00249 static void clean_index(AVFormatContext *s){
00250     int i;
00251     int64_t j;
00252 
00253     for(i=0; i<s->nb_streams; i++){
00254         AVStream *st = s->streams[i];
00255         AVIStream *ast = st->priv_data;
00256         int n= st->nb_index_entries;
00257         int max= ast->sample_size;
00258         int64_t pos, size, ts;
00259 
00260         if(n != 1 || ast->sample_size==0)
00261             continue;
00262 
00263         while(max < 1024) max+=max;
00264 
00265         pos= st->index_entries[0].pos;
00266         size= st->index_entries[0].size;
00267         ts= st->index_entries[0].timestamp;
00268 
00269         for(j=0; j<size; j+=max){
00270             av_add_index_entry(st, pos+j, ts+j, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME);
00271         }
00272     }
00273 }
00274 
00275 static int avi_read_tag(AVFormatContext *s, AVStream *st, uint32_t tag, uint32_t size)
00276 {
00277     AVIOContext *pb = s->pb;
00278     char key[5] = {0}, *value;
00279 
00280     size += (size & 1);
00281 
00282     if (size == UINT_MAX)
00283         return -1;
00284     value = av_malloc(size+1);
00285     if (!value)
00286         return -1;
00287     avio_read(pb, value, size);
00288     value[size]=0;
00289 
00290     AV_WL32(key, tag);
00291 
00292     return av_dict_set(st ? &st->metadata : &s->metadata, key, value,
00293                             AV_DICT_DONT_STRDUP_VAL);
00294 }
00295 
00296 static const char months[12][4] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
00297                                     "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
00298 
00299 static void avi_metadata_creation_time(AVDictionary **metadata, char *date)
00300 {
00301     char month[4], time[9], buffer[64];
00302     int i, day, year;
00303     /* parse standard AVI date format (ie. "Mon Mar 10 15:04:43 2003") */
00304     if (sscanf(date, "%*3s%*[ ]%3s%*[ ]%2d%*[ ]%8s%*[ ]%4d",
00305                month, &day, time, &year) == 4) {
00306         for (i=0; i<12; i++)
00307             if (!av_strcasecmp(month, months[i])) {
00308                 snprintf(buffer, sizeof(buffer), "%.4d-%.2d-%.2d %s",
00309                          year, i+1, day, time);
00310                 av_dict_set(metadata, "creation_time", buffer, 0);
00311             }
00312     } else if (date[4] == '/' && date[7] == '/') {
00313         date[4] = date[7] = '-';
00314         av_dict_set(metadata, "creation_time", date, 0);
00315     }
00316 }
00317 
00318 static void avi_read_nikon(AVFormatContext *s, uint64_t end)
00319 {
00320     while (avio_tell(s->pb) < end) {
00321         uint32_t tag  = avio_rl32(s->pb);
00322         uint32_t size = avio_rl32(s->pb);
00323         switch (tag) {
00324         case MKTAG('n', 'c', 't', 'g'): {  /* Nikon Tags */
00325             uint64_t tag_end = avio_tell(s->pb) + size;
00326             while (avio_tell(s->pb) < tag_end) {
00327                 uint16_t tag  = avio_rl16(s->pb);
00328                 uint16_t size = avio_rl16(s->pb);
00329                 const char *name = NULL;
00330                 char buffer[64] = {0};
00331                 size -= avio_read(s->pb, buffer,
00332                                    FFMIN(size, sizeof(buffer)-1));
00333                 switch (tag) {
00334                 case 0x03:  name = "maker";  break;
00335                 case 0x04:  name = "model";  break;
00336                 case 0x13:  name = "creation_time";
00337                     if (buffer[4] == ':' && buffer[7] == ':')
00338                         buffer[4] = buffer[7] = '-';
00339                     break;
00340                 }
00341                 if (name)
00342                     av_dict_set(&s->metadata, name, buffer, 0);
00343                 avio_skip(s->pb, size);
00344             }
00345             break;
00346         }
00347         default:
00348             avio_skip(s->pb, size);
00349             break;
00350         }
00351     }
00352 }
00353 
00354 static int avi_read_header(AVFormatContext *s)
00355 {
00356     AVIContext *avi = s->priv_data;
00357     AVIOContext *pb = s->pb;
00358     unsigned int tag, tag1, handler;
00359     int codec_type, stream_index, frame_period;
00360     unsigned int size;
00361     int i;
00362     AVStream *st;
00363     AVIStream *ast = NULL;
00364     int avih_width=0, avih_height=0;
00365     int amv_file_format=0;
00366     uint64_t list_end = 0;
00367     int ret;
00368 
00369     avi->stream_index= -1;
00370 
00371     if (get_riff(s, pb) < 0)
00372         return -1;
00373 
00374     av_log(avi, AV_LOG_DEBUG, "use odml:%d\n", avi->use_odml);
00375 
00376     avi->fsize = avio_size(pb);
00377     if(avi->fsize<=0 || avi->fsize < avi->riff_end)
00378         avi->fsize= avi->riff_end == 8 ? INT64_MAX : avi->riff_end;
00379 
00380     /* first list tag */
00381     stream_index = -1;
00382     codec_type = -1;
00383     frame_period = 0;
00384     for(;;) {
00385         if (url_feof(pb))
00386             goto fail;
00387         tag = avio_rl32(pb);
00388         size = avio_rl32(pb);
00389 
00390         print_tag("tag", tag, size);
00391 
00392         switch(tag) {
00393         case MKTAG('L', 'I', 'S', 'T'):
00394             list_end = avio_tell(pb) + size;
00395             /* Ignored, except at start of video packets. */
00396             tag1 = avio_rl32(pb);
00397 
00398             print_tag("list", tag1, 0);
00399 
00400             if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
00401                 avi->movi_list = avio_tell(pb) - 4;
00402                 if(size) avi->movi_end = avi->movi_list + size + (size & 1);
00403                 else     avi->movi_end = avi->fsize;
00404                 av_dlog(NULL, "movi end=%"PRIx64"\n", avi->movi_end);
00405                 goto end_of_header;
00406             }
00407             else if (tag1 == MKTAG('I', 'N', 'F', 'O'))
00408                 ff_read_riff_info(s, size - 4);
00409             else if (tag1 == MKTAG('n', 'c', 'd', 't'))
00410                 avi_read_nikon(s, list_end);
00411 
00412             break;
00413         case MKTAG('I', 'D', 'I', 'T'): {
00414             unsigned char date[64] = {0};
00415             size += (size & 1);
00416             size -= avio_read(pb, date, FFMIN(size, sizeof(date)-1));
00417             avio_skip(pb, size);
00418             avi_metadata_creation_time(&s->metadata, date);
00419             break;
00420         }
00421         case MKTAG('d', 'm', 'l', 'h'):
00422             avi->is_odml = 1;
00423             avio_skip(pb, size + (size & 1));
00424             break;
00425         case MKTAG('a', 'm', 'v', 'h'):
00426             amv_file_format=1;
00427         case MKTAG('a', 'v', 'i', 'h'):
00428             /* AVI header */
00429             /* using frame_period is bad idea */
00430             frame_period = avio_rl32(pb);
00431             avio_rl32(pb); /* max. bytes per second */
00432             avio_rl32(pb);
00433             avi->non_interleaved |= avio_rl32(pb) & AVIF_MUSTUSEINDEX;
00434 
00435             avio_skip(pb, 2 * 4);
00436             avio_rl32(pb);
00437             avio_rl32(pb);
00438             avih_width=avio_rl32(pb);
00439             avih_height=avio_rl32(pb);
00440 
00441             avio_skip(pb, size - 10 * 4);
00442             break;
00443         case MKTAG('s', 't', 'r', 'h'):
00444             /* stream header */
00445 
00446             tag1 = avio_rl32(pb);
00447             handler = avio_rl32(pb); /* codec tag */
00448 
00449             if(tag1 == MKTAG('p', 'a', 'd', 's')){
00450                 avio_skip(pb, size - 8);
00451                 break;
00452             }else{
00453                 stream_index++;
00454                 st = avformat_new_stream(s, NULL);
00455                 if (!st)
00456                     goto fail;
00457 
00458                 st->id = stream_index;
00459                 ast = av_mallocz(sizeof(AVIStream));
00460                 if (!ast)
00461                     goto fail;
00462                 st->priv_data = ast;
00463             }
00464             if(amv_file_format)
00465                 tag1 = stream_index ? MKTAG('a','u','d','s') : MKTAG('v','i','d','s');
00466 
00467             print_tag("strh", tag1, -1);
00468 
00469             if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
00470                 int64_t dv_dur;
00471 
00472                 /*
00473                  * After some consideration -- I don't think we
00474                  * have to support anything but DV in type1 AVIs.
00475                  */
00476                 if (s->nb_streams != 1)
00477                     goto fail;
00478 
00479                 if (handler != MKTAG('d', 'v', 's', 'd') &&
00480                     handler != MKTAG('d', 'v', 'h', 'd') &&
00481                     handler != MKTAG('d', 'v', 's', 'l'))
00482                    goto fail;
00483 
00484                 ast = s->streams[0]->priv_data;
00485                 av_freep(&s->streams[0]->codec->extradata);
00486                 av_freep(&s->streams[0]->codec);
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             assert(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 = 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 = 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                     // Support "Resolution 1:1" for Avid AVI Codec
00639                     if(tag1 == MKTAG('A', 'V', 'R', 'n') &&
00640                        st->codec->extradata_size >= 31 &&
00641                        !memcmp(&st->codec->extradata[28], "1:1", 3))
00642                         st->codec->codec_id = CODEC_ID_RAWVIDEO;
00643 
00644                     if(st->codec->codec_tag==0 && st->codec->height > 0 && st->codec->extradata_size < 1U<<30){
00645                         st->codec->extradata_size+= 9;
00646                         st->codec->extradata= av_realloc_f(st->codec->extradata, 1, st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
00647                         if(st->codec->extradata)
00648                             memcpy(st->codec->extradata + st->codec->extradata_size - 9, "BottomUp", 9);
00649                     }
00650                     st->codec->height= FFABS(st->codec->height);
00651 
00652 //                    avio_skip(pb, size - 5 * 4);
00653                     break;
00654                 case AVMEDIA_TYPE_AUDIO:
00655                     ret = ff_get_wav_header(pb, st->codec, size);
00656                     if (ret < 0)
00657                         return ret;
00658                     ast->dshow_block_align= st->codec->block_align;
00659                     if(ast->sample_size && st->codec->block_align && ast->sample_size != st->codec->block_align){
00660                         av_log(s, AV_LOG_WARNING, "sample size (%d) != block align (%d)\n", ast->sample_size, st->codec->block_align);
00661                         ast->sample_size= st->codec->block_align;
00662                     }
00663                     if (size&1) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
00664                         avio_skip(pb, 1);
00665                     /* Force parsing as several audio frames can be in
00666                      * one packet and timestamps refer to packet start. */
00667                     st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
00668                     /* ADTS header is in extradata, AAC without header must be
00669                      * stored as exact frames. Parser not needed and it will
00670                      * fail. */
00671                     if (st->codec->codec_id == CODEC_ID_AAC && st->codec->extradata_size)
00672                         st->need_parsing = AVSTREAM_PARSE_NONE;
00673                     /* AVI files with Xan DPCM audio (wrongly) declare PCM
00674                      * audio in the header but have Axan as stream_code_tag. */
00675                     if (st->codec->stream_codec_tag == AV_RL32("Axan")){
00676                         st->codec->codec_id  = CODEC_ID_XAN_DPCM;
00677                         st->codec->codec_tag = 0;
00678                         ast->dshow_block_align = 0;
00679                     }
00680                     if (amv_file_format){
00681                         st->codec->codec_id  = CODEC_ID_ADPCM_IMA_AMV;
00682                         ast->dshow_block_align = 0;
00683                     }
00684                     break;
00685                 case AVMEDIA_TYPE_SUBTITLE:
00686                     st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
00687                     st->request_probe= 1;
00688                     break;
00689                 default:
00690                     st->codec->codec_type = AVMEDIA_TYPE_DATA;
00691                     st->codec->codec_id= CODEC_ID_NONE;
00692                     st->codec->codec_tag= 0;
00693                     avio_skip(pb, size);
00694                     break;
00695                 }
00696             }
00697             break;
00698         case MKTAG('s', 't', 'r', 'd'):
00699             if (stream_index >= (unsigned)s->nb_streams || s->streams[stream_index]->codec->extradata_size) {
00700                 avio_skip(pb, size);
00701             } else {
00702                 uint64_t cur_pos = avio_tell(pb);
00703                 if (cur_pos < list_end)
00704                     size = FFMIN(size, list_end - cur_pos);
00705                 st = s->streams[stream_index];
00706 
00707                 if(size<(1<<30)){
00708                     st->codec->extradata_size= size;
00709                     st->codec->extradata= av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
00710                     if (!st->codec->extradata) {
00711                         st->codec->extradata_size= 0;
00712                         return AVERROR(ENOMEM);
00713                     }
00714                     avio_read(pb, st->codec->extradata, st->codec->extradata_size);
00715                 }
00716 
00717                 if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
00718                     avio_r8(pb);
00719             }
00720             break;
00721         case MKTAG('i', 'n', 'd', 'x'):
00722             i= avio_tell(pb);
00723             if(pb->seekable && !(s->flags & AVFMT_FLAG_IGNIDX) && avi->use_odml &&
00724                read_braindead_odml_indx(s, 0) < 0 && (s->error_recognition & AV_EF_EXPLODE))
00725                 goto fail;
00726             avio_seek(pb, i+size, SEEK_SET);
00727             break;
00728         case MKTAG('v', 'p', 'r', 'p'):
00729             if(stream_index < (unsigned)s->nb_streams && size > 9*4){
00730                 AVRational active, active_aspect;
00731 
00732                 st = s->streams[stream_index];
00733                 avio_rl32(pb);
00734                 avio_rl32(pb);
00735                 avio_rl32(pb);
00736                 avio_rl32(pb);
00737                 avio_rl32(pb);
00738 
00739                 active_aspect.den= avio_rl16(pb);
00740                 active_aspect.num= avio_rl16(pb);
00741                 active.num       = avio_rl32(pb);
00742                 active.den       = avio_rl32(pb);
00743                 avio_rl32(pb); //nbFieldsPerFrame
00744 
00745                 if(active_aspect.num && active_aspect.den && active.num && active.den){
00746                     st->sample_aspect_ratio= av_div_q(active_aspect, active);
00747 //av_log(s, AV_LOG_ERROR, "vprp %d/%d %d/%d\n", active_aspect.num, active_aspect.den, active.num, active.den);
00748                 }
00749                 size -= 9*4;
00750             }
00751             avio_skip(pb, size);
00752             break;
00753         case MKTAG('s', 't', 'r', 'n'):
00754             if(s->nb_streams){
00755                 avi_read_tag(s, s->streams[s->nb_streams-1], tag, size);
00756                 break;
00757             }
00758         default:
00759             if(size > 1000000){
00760                 av_log(s, AV_LOG_ERROR, "Something went wrong during header parsing, "
00761                                         "I will ignore it and try to continue anyway.\n");
00762                 if (s->error_recognition & AV_EF_EXPLODE)
00763                     goto fail;
00764                 avi->movi_list = avio_tell(pb) - 4;
00765                 avi->movi_end  = avi->fsize;
00766                 goto end_of_header;
00767             }
00768             /* skip tag */
00769             size += (size & 1);
00770             avio_skip(pb, size);
00771             break;
00772         }
00773     }
00774  end_of_header:
00775     /* check stream number */
00776     if (stream_index != s->nb_streams - 1) {
00777     fail:
00778         return -1;
00779     }
00780 
00781     if(!avi->index_loaded && pb->seekable)
00782         avi_load_index(s);
00783     avi->index_loaded |= 1;
00784     avi->non_interleaved |= guess_ni_flag(s) | (s->flags & AVFMT_FLAG_SORT_DTS);
00785     for(i=0; i<s->nb_streams; i++){
00786         AVStream *st = s->streams[i];
00787         if(st->nb_index_entries)
00788             break;
00789     }
00790     // DV-in-AVI cannot be non-interleaved, if set this must be
00791     // a mis-detection.
00792     if(avi->dv_demux)
00793         avi->non_interleaved=0;
00794     if(i==s->nb_streams && avi->non_interleaved) {
00795         av_log(s, AV_LOG_WARNING, "non-interleaved AVI without index, switching to interleaved\n");
00796         avi->non_interleaved=0;
00797     }
00798 
00799     if(avi->non_interleaved) {
00800         av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
00801         clean_index(s);
00802     }
00803 
00804     ff_metadata_conv_ctx(s, NULL, avi_metadata_conv);
00805     ff_metadata_conv_ctx(s, NULL, ff_riff_info_conv);
00806 
00807     return 0;
00808 }
00809 
00810 static int read_gab2_sub(AVStream *st, AVPacket *pkt) {
00811     if (!strcmp(pkt->data, "GAB2") && AV_RL16(pkt->data+5) == 2) {
00812         uint8_t desc[256];
00813         int score = AVPROBE_SCORE_MAX / 2, ret;
00814         AVIStream *ast = st->priv_data;
00815         AVInputFormat *sub_demuxer;
00816         AVRational time_base;
00817         AVIOContext *pb = avio_alloc_context( pkt->data + 7,
00818                                               pkt->size - 7,
00819                                               0, NULL, NULL, NULL, NULL);
00820         AVProbeData pd;
00821         unsigned int desc_len = avio_rl32(pb);
00822 
00823         if (desc_len > pb->buf_end - pb->buf_ptr)
00824             goto error;
00825 
00826         ret = avio_get_str16le(pb, desc_len, desc, sizeof(desc));
00827         avio_skip(pb, desc_len - ret);
00828         if (*desc)
00829             av_dict_set(&st->metadata, "title", desc, 0);
00830 
00831         avio_rl16(pb);   /* flags? */
00832         avio_rl32(pb);   /* data size */
00833 
00834         pd = (AVProbeData) { .buf = pb->buf_ptr, .buf_size = pb->buf_end - pb->buf_ptr };
00835         if (!(sub_demuxer = av_probe_input_format2(&pd, 1, &score)))
00836             goto error;
00837 
00838         if (!(ast->sub_ctx = avformat_alloc_context()))
00839             goto error;
00840 
00841         ast->sub_ctx->pb      = pb;
00842         if (!avformat_open_input(&ast->sub_ctx, "", sub_demuxer, NULL)) {
00843             ff_read_packet(ast->sub_ctx, &ast->sub_pkt);
00844             *st->codec = *ast->sub_ctx->streams[0]->codec;
00845             ast->sub_ctx->streams[0]->codec->extradata = NULL;
00846             time_base = ast->sub_ctx->streams[0]->time_base;
00847             avpriv_set_pts_info(st, 64, time_base.num, time_base.den);
00848         }
00849         ast->sub_buffer = pkt->data;
00850         memset(pkt, 0, sizeof(*pkt));
00851         return 1;
00852 error:
00853         av_freep(&pb);
00854     }
00855     return 0;
00856 }
00857 
00858 static AVStream *get_subtitle_pkt(AVFormatContext *s, AVStream *next_st,
00859                                   AVPacket *pkt)
00860 {
00861     AVIStream *ast, *next_ast = next_st->priv_data;
00862     int64_t ts, next_ts, ts_min = INT64_MAX;
00863     AVStream *st, *sub_st = NULL;
00864     int i;
00865 
00866     next_ts = av_rescale_q(next_ast->frame_offset, next_st->time_base,
00867                            AV_TIME_BASE_Q);
00868 
00869     for (i=0; i<s->nb_streams; i++) {
00870         st  = s->streams[i];
00871         ast = st->priv_data;
00872         if (st->discard < AVDISCARD_ALL && ast && ast->sub_pkt.data) {
00873             ts = av_rescale_q(ast->sub_pkt.dts, st->time_base, AV_TIME_BASE_Q);
00874             if (ts <= next_ts && ts < ts_min) {
00875                 ts_min = ts;
00876                 sub_st = st;
00877             }
00878         }
00879     }
00880 
00881     if (sub_st) {
00882         ast = sub_st->priv_data;
00883         *pkt = ast->sub_pkt;
00884         pkt->stream_index = sub_st->index;
00885         if (ff_read_packet(ast->sub_ctx, &ast->sub_pkt) < 0)
00886             ast->sub_pkt.data = NULL;
00887     }
00888     return sub_st;
00889 }
00890 
00891 static int get_stream_idx(int *d){
00892     if(    d[0] >= '0' && d[0] <= '9'
00893         && d[1] >= '0' && d[1] <= '9'){
00894         return (d[0] - '0') * 10 + (d[1] - '0');
00895     }else{
00896         return 100; //invalid stream ID
00897     }
00898 }
00899 
00904 static int avi_sync(AVFormatContext *s, int exit_early)
00905 {
00906     AVIContext *avi = s->priv_data;
00907     AVIOContext *pb = s->pb;
00908     int n;
00909     unsigned int d[8];
00910     unsigned int size;
00911     int64_t i, sync;
00912 
00913 start_sync:
00914     memset(d, -1, sizeof(d));
00915     for(i=sync=avio_tell(pb); !url_feof(pb); i++) {
00916         int j;
00917 
00918         for(j=0; j<7; j++)
00919             d[j]= d[j+1];
00920         d[7]= avio_r8(pb);
00921 
00922         size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
00923 
00924         n= get_stream_idx(d+2);
00925 //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);
00926         if(i + (uint64_t)size > avi->fsize || d[0] > 127)
00927             continue;
00928 
00929         //parse ix##
00930         if(  (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
00931         //parse JUNK
00932            ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')
00933            ||(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')){
00934             avio_skip(pb, size);
00935 //av_log(s, AV_LOG_DEBUG, "SKIP\n");
00936             goto start_sync;
00937         }
00938 
00939         //parse stray LIST
00940         if(d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T'){
00941             avio_skip(pb, 4);
00942             goto start_sync;
00943         }
00944 
00945         n= get_stream_idx(d);
00946 
00947         if(!((i-avi->last_pkt_pos)&1) && get_stream_idx(d+1) < s->nb_streams)
00948             continue;
00949 
00950         //detect ##ix chunk and skip
00951         if(d[2] == 'i' && d[3] == 'x' && n < s->nb_streams){
00952             avio_skip(pb, size);
00953             goto start_sync;
00954         }
00955 
00956         //parse ##dc/##wb
00957         if(n < s->nb_streams){
00958             AVStream *st;
00959             AVIStream *ast;
00960             st = s->streams[n];
00961             ast = st->priv_data;
00962 
00963             if (!ast) {
00964                 av_log(s, AV_LOG_WARNING, "Skiping foreign stream %d packet\n", n);
00965                 continue;
00966             }
00967 
00968             if(s->nb_streams>=2){
00969                 AVStream *st1  = s->streams[1];
00970                 AVIStream *ast1= st1->priv_data;
00971                 //workaround for broken small-file-bug402.avi
00972                 if(   d[2] == 'w' && d[3] == 'b'
00973                    && n==0
00974                    && st ->codec->codec_type == AVMEDIA_TYPE_VIDEO
00975                    && st1->codec->codec_type == AVMEDIA_TYPE_AUDIO
00976                    && ast->prefix == 'd'*256+'c'
00977                    && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
00978                   ){
00979                     n=1;
00980                     st = st1;
00981                     ast = ast1;
00982                     av_log(s, AV_LOG_WARNING, "Invalid stream + prefix combination, assuming audio.\n");
00983                 }
00984             }
00985 
00986 
00987             if(   (st->discard >= AVDISCARD_DEFAULT && size==0)
00988                /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & AV_PKT_FLAG_KEY))*/ //FIXME needs a little reordering
00989                || st->discard >= AVDISCARD_ALL){
00990                 if (!exit_early) {
00991                     ast->frame_offset += get_duration(ast, size);
00992                 }
00993                 avio_skip(pb, size);
00994                 goto start_sync;
00995             }
00996 
00997             if (d[2] == 'p' && d[3] == 'c' && size<=4*256+4) {
00998                 int k = avio_r8(pb);
00999                 int last = (k + avio_r8(pb) - 1) & 0xFF;
01000 
01001                 avio_rl16(pb); //flags
01002 
01003                 for (; k <= last; k++)
01004                     ast->pal[k] = 0xFF<<24 | avio_rb32(pb)>>8;// b + (g << 8) + (r << 16);
01005                 ast->has_pal= 1;
01006                 goto start_sync;
01007             } else if(   ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
01008                          d[2]*256+d[3] == ast->prefix /*||
01009                          (d[2] == 'd' && d[3] == 'c') ||
01010                          (d[2] == 'w' && d[3] == 'b')*/) {
01011 
01012                 if (exit_early)
01013                     return 0;
01014 //av_log(s, AV_LOG_DEBUG, "OK\n");
01015                 if(d[2]*256+d[3] == ast->prefix)
01016                     ast->prefix_count++;
01017                 else{
01018                     ast->prefix= d[2]*256+d[3];
01019                     ast->prefix_count= 0;
01020                 }
01021 
01022                 avi->stream_index= n;
01023                 ast->packet_size= size + 8;
01024                 ast->remaining= size;
01025 
01026                 if(size || !ast->sample_size){
01027                     uint64_t pos= avio_tell(pb) - 8;
01028                     if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){
01029                         av_add_index_entry(st, pos, ast->frame_offset, size, 0, AVINDEX_KEYFRAME);
01030                     }
01031                 }
01032                 return 0;
01033             }
01034         }
01035     }
01036 
01037     if(pb->error)
01038         return pb->error;
01039     return AVERROR_EOF;
01040 }
01041 
01042 static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
01043 {
01044     AVIContext *avi = s->priv_data;
01045     AVIOContext *pb = s->pb;
01046     int err;
01047     void* dstr;
01048 
01049     if (CONFIG_DV_DEMUXER && avi->dv_demux) {
01050         int size = avpriv_dv_get_packet(avi->dv_demux, pkt);
01051         if (size >= 0)
01052             return size;
01053     }
01054 
01055     if(avi->non_interleaved){
01056         int best_stream_index = 0;
01057         AVStream *best_st= NULL;
01058         AVIStream *best_ast;
01059         int64_t best_ts= INT64_MAX;
01060         int i;
01061 
01062         for(i=0; i<s->nb_streams; i++){
01063             AVStream *st = s->streams[i];
01064             AVIStream *ast = st->priv_data;
01065             int64_t ts= ast->frame_offset;
01066             int64_t last_ts;
01067 
01068             if(!st->nb_index_entries)
01069                 continue;
01070 
01071             last_ts = st->index_entries[st->nb_index_entries - 1].timestamp;
01072             if(!ast->remaining && ts > last_ts)
01073                 continue;
01074 
01075             ts = av_rescale_q(ts, st->time_base, (AVRational){FFMAX(1, ast->sample_size), AV_TIME_BASE});
01076 
01077 //            av_log(s, AV_LOG_DEBUG, "%"PRId64" %d/%d %"PRId64"\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
01078             if(ts < best_ts){
01079                 best_ts= ts;
01080                 best_st= st;
01081                 best_stream_index= i;
01082             }
01083         }
01084         if(!best_st)
01085             return AVERROR_EOF;
01086 
01087         best_ast = best_st->priv_data;
01088         best_ts = best_ast->frame_offset;
01089         if(best_ast->remaining)
01090             i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
01091         else{
01092             i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
01093             if(i>=0)
01094                 best_ast->frame_offset= best_st->index_entries[i].timestamp;
01095         }
01096 
01097 //        av_log(s, AV_LOG_DEBUG, "%d\n", i);
01098         if(i>=0){
01099             int64_t pos= best_st->index_entries[i].pos;
01100             pos += best_ast->packet_size - best_ast->remaining;
01101             if(avio_seek(s->pb, pos + 8, SEEK_SET) < 0)
01102               return AVERROR_EOF;
01103 //        av_log(s, AV_LOG_DEBUG, "pos=%"PRId64"\n", pos);
01104 
01105             assert(best_ast->remaining <= best_ast->packet_size);
01106 
01107             avi->stream_index= best_stream_index;
01108             if(!best_ast->remaining)
01109                 best_ast->packet_size=
01110                 best_ast->remaining= best_st->index_entries[i].size;
01111         }
01112         else
01113           return AVERROR_EOF;
01114     }
01115 
01116 resync:
01117     if(avi->stream_index >= 0){
01118         AVStream *st= s->streams[ avi->stream_index ];
01119         AVIStream *ast= st->priv_data;
01120         int size, err;
01121 
01122         if(get_subtitle_pkt(s, st, pkt))
01123             return 0;
01124 
01125         if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
01126             size= INT_MAX;
01127         else if(ast->sample_size < 32)
01128             // arbitrary multiplier to avoid tiny packets for raw PCM data
01129             size= 1024*ast->sample_size;
01130         else
01131             size= ast->sample_size;
01132 
01133         if(size > ast->remaining)
01134             size= ast->remaining;
01135         avi->last_pkt_pos= avio_tell(pb);
01136         err= av_get_packet(pb, pkt, size);
01137         if(err<0)
01138             return err;
01139         size = err;
01140 
01141         if(ast->has_pal && pkt->data && pkt->size<(unsigned)INT_MAX/2){
01142             uint8_t *pal;
01143             pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, AVPALETTE_SIZE);
01144             if(!pal){
01145                 av_log(s, AV_LOG_ERROR, "Failed to allocate data for palette\n");
01146             }else{
01147                 memcpy(pal, ast->pal, AVPALETTE_SIZE);
01148                 ast->has_pal = 0;
01149             }
01150         }
01151 
01152         if (CONFIG_DV_DEMUXER && avi->dv_demux) {
01153             dstr = pkt->destruct;
01154             size = avpriv_dv_produce_packet(avi->dv_demux, pkt,
01155                                     pkt->data, pkt->size, pkt->pos);
01156             pkt->destruct = dstr;
01157             pkt->flags |= AV_PKT_FLAG_KEY;
01158             if (size < 0)
01159                 av_free_packet(pkt);
01160         } else if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE
01161                    && !st->codec->codec_tag && read_gab2_sub(st, pkt)) {
01162             ast->frame_offset++;
01163             avi->stream_index = -1;
01164             ast->remaining = 0;
01165             goto resync;
01166         } else {
01167             /* XXX: How to handle B-frames in AVI? */
01168             pkt->dts = ast->frame_offset;
01169 //                pkt->dts += ast->start;
01170             if(ast->sample_size)
01171                 pkt->dts /= ast->sample_size;
01172 //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);
01173             pkt->stream_index = avi->stream_index;
01174 
01175             if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
01176                 AVIndexEntry *e;
01177                 int index;
01178                 assert(st->index_entries);
01179 
01180                 index= av_index_search_timestamp(st, ast->frame_offset, 0);
01181                 e= &st->index_entries[index];
01182 
01183                 if(index >= 0 && e->timestamp == ast->frame_offset){
01184                     if (index == st->nb_index_entries-1){
01185                         int key=1;
01186                         int i;
01187                         uint32_t state=-1;
01188                         for(i=0; i<FFMIN(size,256); i++){
01189                             if(st->codec->codec_id == CODEC_ID_MPEG4){
01190                                 if(state == 0x1B6){
01191                                     key= !(pkt->data[i]&0xC0);
01192                                     break;
01193                                 }
01194                             }else
01195                                 break;
01196                             state= (state<<8) + pkt->data[i];
01197                         }
01198                         if(!key)
01199                             e->flags &= ~AVINDEX_KEYFRAME;
01200                     }
01201                     if (e->flags & AVINDEX_KEYFRAME)
01202                         pkt->flags |= AV_PKT_FLAG_KEY;
01203                 }
01204             } else {
01205                 pkt->flags |= AV_PKT_FLAG_KEY;
01206             }
01207             ast->frame_offset += get_duration(ast, pkt->size);
01208         }
01209         ast->remaining -= size;
01210         if(!ast->remaining){
01211             avi->stream_index= -1;
01212             ast->packet_size= 0;
01213         }
01214 
01215         if(!avi->non_interleaved && pkt->pos >= 0 && ast->seek_pos > pkt->pos){
01216             av_free_packet(pkt);
01217             goto resync;
01218         }
01219         ast->seek_pos= 0;
01220 
01221         if(!avi->non_interleaved && st->nb_index_entries>1 && avi->index_loaded>1){
01222             int64_t dts= av_rescale_q(pkt->dts, st->time_base, AV_TIME_BASE_Q);
01223 
01224             if(avi->dts_max - dts > 2*AV_TIME_BASE){
01225                 avi->non_interleaved= 1;
01226                 av_log(s, AV_LOG_INFO, "Switching to NI mode, due to poor interleaving\n");
01227             }else if(avi->dts_max < dts)
01228                 avi->dts_max = dts;
01229         }
01230 
01231         return size;
01232     }
01233 
01234     if ((err = avi_sync(s, 0)) < 0)
01235         return err;
01236     goto resync;
01237 }
01238 
01239 /* XXX: We make the implicit supposition that the positions are sorted
01240    for each stream. */
01241 static int avi_read_idx1(AVFormatContext *s, int size)
01242 {
01243     AVIContext *avi = s->priv_data;
01244     AVIOContext *pb = s->pb;
01245     int nb_index_entries, i;
01246     AVStream *st;
01247     AVIStream *ast;
01248     unsigned int index, tag, flags, pos, len, first_packet = 1;
01249     unsigned last_pos= -1;
01250     unsigned last_idx= -1;
01251     int64_t idx1_pos, first_packet_pos = 0, data_offset = 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     }
01304     return 0;
01305 }
01306 
01307 static int guess_ni_flag(AVFormatContext *s){
01308     int i;
01309     int64_t last_start=0;
01310     int64_t first_end= INT64_MAX;
01311     int64_t oldpos= avio_tell(s->pb);
01312     int *idx;
01313     int64_t min_pos, pos;
01314 
01315     for(i=0; i<s->nb_streams; i++){
01316         AVStream *st = s->streams[i];
01317         int n= st->nb_index_entries;
01318         unsigned int size;
01319 
01320         if(n <= 0)
01321             continue;
01322 
01323         if(n >= 2){
01324             int64_t pos= st->index_entries[0].pos;
01325             avio_seek(s->pb, pos + 4, SEEK_SET);
01326             size= avio_rl32(s->pb);
01327             if(pos + size > st->index_entries[1].pos)
01328                 last_start= INT64_MAX;
01329         }
01330 
01331         if(st->index_entries[0].pos > last_start)
01332             last_start= st->index_entries[0].pos;
01333         if(st->index_entries[n-1].pos < first_end)
01334             first_end= st->index_entries[n-1].pos;
01335     }
01336     avio_seek(s->pb, oldpos, SEEK_SET);
01337     if (last_start > first_end)
01338         return 1;
01339     idx= av_mallocz(sizeof(*idx) * s->nb_streams);
01340     for (min_pos=pos=0; min_pos!=INT64_MAX; pos= min_pos+1) {
01341         int64_t max_dts = INT64_MIN/2, min_dts= INT64_MAX/2;
01342         min_pos = INT64_MAX;
01343 
01344         for (i=0; i<s->nb_streams; i++) {
01345             AVStream *st = s->streams[i];
01346             int n= st->nb_index_entries;
01347             while (idx[i]<n && st->index_entries[idx[i]].pos < pos)
01348                 idx[i]++;
01349             if (idx[i] < n) {
01350                 min_dts = FFMIN(min_dts, av_rescale_q(st->index_entries[idx[i]].timestamp, st->time_base, AV_TIME_BASE_Q));
01351                 min_pos = FFMIN(min_pos, st->index_entries[idx[i]].pos);
01352             }
01353             if (idx[i])
01354                 max_dts = FFMAX(max_dts, av_rescale_q(st->index_entries[idx[i]-1].timestamp, st->time_base, AV_TIME_BASE_Q));
01355         }
01356         if(max_dts - min_dts > 2*AV_TIME_BASE) {
01357             av_free(idx);
01358             return 1;
01359         }
01360     }
01361     av_free(idx);
01362     return 0;
01363 }
01364 
01365 static int avi_load_index(AVFormatContext *s)
01366 {
01367     AVIContext *avi = s->priv_data;
01368     AVIOContext *pb = s->pb;
01369     uint32_t tag, size;
01370     int64_t pos= avio_tell(pb);
01371     int ret = -1;
01372 
01373     if (avio_seek(pb, avi->movi_end, SEEK_SET) < 0)
01374         goto the_end; // maybe truncated file
01375     av_dlog(s, "movi_end=0x%"PRIx64"\n", avi->movi_end);
01376     for(;;) {
01377         if (url_feof(pb))
01378             break;
01379         tag = avio_rl32(pb);
01380         size = avio_rl32(pb);
01381         av_dlog(s, "tag=%c%c%c%c size=0x%x\n",
01382                  tag        & 0xff,
01383                 (tag >>  8) & 0xff,
01384                 (tag >> 16) & 0xff,
01385                 (tag >> 24) & 0xff,
01386                 size);
01387 
01388         if (tag == MKTAG('i', 'd', 'x', '1') &&
01389             avi_read_idx1(s, size) >= 0) {
01390             avi->index_loaded=2;
01391             ret = 0;
01392             break;
01393         }
01394 
01395         size += (size & 1);
01396         if (avio_skip(pb, size) < 0)
01397             break; // something is wrong here
01398     }
01399  the_end:
01400     avio_seek(pb, pos, SEEK_SET);
01401     return ret;
01402 }
01403 
01404 static void seek_subtitle(AVStream *st, AVStream *st2, int64_t timestamp)
01405 {
01406     AVIStream *ast2 = st2->priv_data;
01407     int64_t ts2 = av_rescale_q(timestamp, st->time_base, st2->time_base);
01408     av_free_packet(&ast2->sub_pkt);
01409     if (avformat_seek_file(ast2->sub_ctx, 0, INT64_MIN, ts2, ts2, 0) >= 0 ||
01410         avformat_seek_file(ast2->sub_ctx, 0, ts2, ts2, INT64_MAX, 0) >= 0)
01411         ff_read_packet(ast2->sub_ctx, &ast2->sub_pkt);
01412 }
01413 
01414 static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
01415 {
01416     AVIContext *avi = s->priv_data;
01417     AVStream *st;
01418     int i, index;
01419     int64_t pos, pos_min;
01420     AVIStream *ast;
01421 
01422     if (!avi->index_loaded) {
01423         /* we only load the index on demand */
01424         avi_load_index(s);
01425         avi->index_loaded |= 1;
01426     }
01427     assert(stream_index>= 0);
01428 
01429     st = s->streams[stream_index];
01430     ast= st->priv_data;
01431     index= av_index_search_timestamp(st, timestamp * FFMAX(ast->sample_size, 1), flags);
01432     if (index<0) {
01433         if (st->nb_index_entries > 0)
01434             av_log(s, AV_LOG_DEBUG, "Failed to find timestamp %"PRId64 " in index %"PRId64 " .. %"PRId64 "\n",
01435                    timestamp * FFMAX(ast->sample_size, 1),
01436                    st->index_entries[0].timestamp,
01437                    st->index_entries[st->nb_index_entries - 1].timestamp);
01438         return -1;
01439     }
01440 
01441     /* find the position */
01442     pos = st->index_entries[index].pos;
01443     timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1);
01444 
01445 //    av_log(s, AV_LOG_DEBUG, "XX %"PRId64" %d %"PRId64"\n", timestamp, index, st->index_entries[index].timestamp);
01446 
01447     if (CONFIG_DV_DEMUXER && avi->dv_demux) {
01448         /* One and only one real stream for DV in AVI, and it has video  */
01449         /* offsets. Calling with other stream indexes should have failed */
01450         /* the av_index_search_timestamp call above.                     */
01451         assert(stream_index == 0);
01452 
01453         if(avio_seek(s->pb, pos, SEEK_SET) < 0)
01454             return -1;
01455 
01456         /* Feed the DV video stream version of the timestamp to the */
01457         /* DV demux so it can synthesize correct timestamps.        */
01458         ff_dv_offset_reset(avi->dv_demux, timestamp);
01459 
01460         avi->stream_index= -1;
01461         return 0;
01462     }
01463 
01464     pos_min= pos;
01465     for(i = 0; i < s->nb_streams; i++) {
01466         AVStream *st2 = s->streams[i];
01467         AVIStream *ast2 = st2->priv_data;
01468 
01469         ast2->packet_size=
01470         ast2->remaining= 0;
01471 
01472         if (ast2->sub_ctx) {
01473             seek_subtitle(st, st2, timestamp);
01474             continue;
01475         }
01476 
01477         if (st2->nb_index_entries <= 0)
01478             continue;
01479 
01480 //        assert(st2->codec->block_align);
01481         assert((int64_t)st2->time_base.num*ast2->rate == (int64_t)st2->time_base.den*ast2->scale);
01482         index = av_index_search_timestamp(
01483                 st2,
01484                 av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
01485                 flags | AVSEEK_FLAG_BACKWARD | (st2->codec->codec_type != AVMEDIA_TYPE_VIDEO ? AVSEEK_FLAG_ANY : 0));
01486         if(index<0)
01487             index=0;
01488         ast2->seek_pos= st2->index_entries[index].pos;
01489         pos_min= FFMIN(pos_min,ast2->seek_pos);
01490     }
01491     for(i = 0; i < s->nb_streams; i++) {
01492         AVStream *st2 = s->streams[i];
01493         AVIStream *ast2 = st2->priv_data;
01494 
01495         if (ast2->sub_ctx || st2->nb_index_entries <= 0)
01496             continue;
01497 
01498         index = av_index_search_timestamp(
01499                 st2,
01500                 av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
01501                 flags | AVSEEK_FLAG_BACKWARD | (st2->codec->codec_type != AVMEDIA_TYPE_VIDEO ? AVSEEK_FLAG_ANY : 0));
01502         if(index<0)
01503             index=0;
01504         while(!avi->non_interleaved && index>0 && st2->index_entries[index-1].pos >= pos_min)
01505             index--;
01506         ast2->frame_offset = st2->index_entries[index].timestamp;
01507     }
01508 
01509     /* do the seek */
01510     if (avio_seek(s->pb, pos_min, SEEK_SET) < 0) {
01511         av_log(s, AV_LOG_ERROR, "Seek failed\n");
01512         return -1;
01513     }
01514     avi->stream_index= -1;
01515     avi->dts_max= INT_MIN;
01516     return 0;
01517 }
01518 
01519 static int avi_read_close(AVFormatContext *s)
01520 {
01521     int i;
01522     AVIContext *avi = s->priv_data;
01523 
01524     for(i=0;i<s->nb_streams;i++) {
01525         AVStream *st = s->streams[i];
01526         AVIStream *ast = st->priv_data;
01527         if (ast) {
01528             if (ast->sub_ctx) {
01529                 av_freep(&ast->sub_ctx->pb);
01530                 avformat_close_input(&ast->sub_ctx);
01531             }
01532             av_free(ast->sub_buffer);
01533             av_free_packet(&ast->sub_pkt);
01534         }
01535     }
01536 
01537     av_free(avi->dv_demux);
01538 
01539     return 0;
01540 }
01541 
01542 static int avi_probe(AVProbeData *p)
01543 {
01544     int i;
01545 
01546     /* check file header */
01547     for(i=0; avi_headers[i][0]; i++)
01548         if(!memcmp(p->buf  , avi_headers[i]  , 4) &&
01549            !memcmp(p->buf+8, avi_headers[i]+4, 4))
01550             return AVPROBE_SCORE_MAX;
01551 
01552     return 0;
01553 }
01554 
01555 AVInputFormat ff_avi_demuxer = {
01556     .name           = "avi",
01557     .long_name      = NULL_IF_CONFIG_SMALL("AVI format"),
01558     .priv_data_size = sizeof(AVIContext),
01559     .read_probe     = avi_probe,
01560     .read_header    = avi_read_header,
01561     .read_packet    = avi_read_packet,
01562     .read_close     = avi_read_close,
01563     .read_seek      = avi_read_seek,
01564     .priv_class = &demuxer_class,
01565 };