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 //#define DEBUG
00023 //#define DEBUG_SEEK
00024 
00025 #include "libavutil/intreadwrite.h"
00026 #include "libavutil/bswap.h"
00027 #include "avformat.h"
00028 #include "avi.h"
00029 #include "dv.h"
00030 #include "riff.h"
00031 
00032 #undef NDEBUG
00033 #include <assert.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     int scale;
00042     int 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 } AVIStream;
00052 
00053 typedef struct {
00054     int64_t  riff_end;
00055     int64_t  movi_end;
00056     int64_t  fsize;
00057     int64_t movi_list;
00058     int64_t last_pkt_pos;
00059     int index_loaded;
00060     int is_odml;
00061     int non_interleaved;
00062     int stream_index;
00063     DVDemuxContext* dv_demux;
00064 } AVIContext;
00065 
00066 static const char avi_headers[][8] = {
00067     { 'R', 'I', 'F', 'F',    'A', 'V', 'I', ' ' },
00068     { 'R', 'I', 'F', 'F',    'A', 'V', 'I', 'X' },
00069     { 'R', 'I', 'F', 'F',    'A', 'V', 'I', 0x19},
00070     { 'O', 'N', '2', ' ',    'O', 'N', '2', 'f' },
00071     { 'R', 'I', 'F', 'F',    'A', 'M', 'V', ' ' },
00072     { 0 }
00073 };
00074 
00075 static int avi_load_index(AVFormatContext *s);
00076 static int guess_ni_flag(AVFormatContext *s);
00077 
00078 #ifdef DEBUG
00079 static void print_tag(const char *str, unsigned int tag, int size)
00080 {
00081     dprintf(NULL, "%s: tag=%c%c%c%c size=0x%x\n",
00082            str, tag & 0xff,
00083            (tag >> 8) & 0xff,
00084            (tag >> 16) & 0xff,
00085            (tag >> 24) & 0xff,
00086            size);
00087 }
00088 #endif
00089 
00090 static int get_riff(AVFormatContext *s, ByteIOContext *pb)
00091 {
00092     AVIContext *avi = s->priv_data;
00093     char header[8];
00094     int i;
00095 
00096     /* check RIFF header */
00097     get_buffer(pb, header, 4);
00098     avi->riff_end = get_le32(pb);   /* RIFF chunk size */
00099     avi->riff_end += url_ftell(pb); /* RIFF chunk end */
00100     get_buffer(pb, header+4, 4);
00101 
00102     for(i=0; avi_headers[i][0]; i++)
00103         if(!memcmp(header, avi_headers[i], 8))
00104             break;
00105     if(!avi_headers[i][0])
00106         return -1;
00107 
00108     if(header[7] == 0x19)
00109         av_log(s, AV_LOG_INFO, "This file has been generated by a totally broken muxer.\n");
00110 
00111     return 0;
00112 }
00113 
00114 static int read_braindead_odml_indx(AVFormatContext *s, int frame_num){
00115     AVIContext *avi = s->priv_data;
00116     ByteIOContext *pb = s->pb;
00117     int longs_pre_entry= get_le16(pb);
00118     int index_sub_type = get_byte(pb);
00119     int index_type     = get_byte(pb);
00120     int entries_in_use = get_le32(pb);
00121     int chunk_id       = get_le32(pb);
00122     int64_t base       = get_le64(pb);
00123     int stream_id= 10*((chunk_id&0xFF) - '0') + (((chunk_id>>8)&0xFF) - '0');
00124     AVStream *st;
00125     AVIStream *ast;
00126     int i;
00127     int64_t last_pos= -1;
00128     int64_t filesize= url_fsize(s->pb);
00129 
00130 #ifdef DEBUG_SEEK
00131     av_log(s, AV_LOG_ERROR, "longs_pre_entry:%d index_type:%d entries_in_use:%d chunk_id:%X base:%16"PRIX64"\n",
00132         longs_pre_entry,index_type, entries_in_use, chunk_id, base);
00133 #endif
00134 
00135     if(stream_id >= s->nb_streams || stream_id < 0)
00136         return -1;
00137     st= s->streams[stream_id];
00138     ast = st->priv_data;
00139 
00140     if(index_sub_type)
00141         return -1;
00142 
00143     get_le32(pb);
00144 
00145     if(index_type && longs_pre_entry != 2)
00146         return -1;
00147     if(index_type>1)
00148         return -1;
00149 
00150     if(filesize > 0 && base >= filesize){
00151         av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
00152         if(base>>32 == (base & 0xFFFFFFFF) && (base & 0xFFFFFFFF) < filesize && filesize <= 0xFFFFFFFF)
00153             base &= 0xFFFFFFFF;
00154         else
00155             return -1;
00156     }
00157 
00158     for(i=0; i<entries_in_use; i++){
00159         if(index_type){
00160             int64_t pos= get_le32(pb) + base - 8;
00161             int len    = get_le32(pb);
00162             int key= len >= 0;
00163             len &= 0x7FFFFFFF;
00164 
00165 #ifdef DEBUG_SEEK
00166             av_log(s, AV_LOG_ERROR, "pos:%"PRId64", len:%X\n", pos, len);
00167 #endif
00168             if(url_feof(pb))
00169                 return -1;
00170 
00171             if(last_pos == pos || pos == base - 8)
00172                 avi->non_interleaved= 1;
00173             if(last_pos != pos && (len || !ast->sample_size))
00174                 av_add_index_entry(st, pos, ast->cum_len, len, 0, key ? AVINDEX_KEYFRAME : 0);
00175 
00176             if(ast->sample_size)
00177                 ast->cum_len += len;
00178             else
00179                 ast->cum_len ++;
00180             last_pos= pos;
00181         }else{
00182             int64_t offset, pos;
00183             int duration;
00184             offset = get_le64(pb);
00185             get_le32(pb);       /* size */
00186             duration = get_le32(pb);
00187 
00188             if(url_feof(pb))
00189                 return -1;
00190 
00191             pos = url_ftell(pb);
00192 
00193             url_fseek(pb, offset+8, SEEK_SET);
00194             read_braindead_odml_indx(s, frame_num);
00195             frame_num += duration;
00196 
00197             url_fseek(pb, pos, SEEK_SET);
00198         }
00199     }
00200     avi->index_loaded=1;
00201     return 0;
00202 }
00203 
00204 static void clean_index(AVFormatContext *s){
00205     int i;
00206     int64_t j;
00207 
00208     for(i=0; i<s->nb_streams; i++){
00209         AVStream *st = s->streams[i];
00210         AVIStream *ast = st->priv_data;
00211         int n= st->nb_index_entries;
00212         int max= ast->sample_size;
00213         int64_t pos, size, ts;
00214 
00215         if(n != 1 || ast->sample_size==0)
00216             continue;
00217 
00218         while(max < 1024) max+=max;
00219 
00220         pos= st->index_entries[0].pos;
00221         size= st->index_entries[0].size;
00222         ts= st->index_entries[0].timestamp;
00223 
00224         for(j=0; j<size; j+=max){
00225             av_add_index_entry(st, pos+j, ts+j, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME);
00226         }
00227     }
00228 }
00229 
00230 static int avi_read_tag(AVFormatContext *s, AVStream *st, uint32_t tag, uint32_t size)
00231 {
00232     ByteIOContext *pb = s->pb;
00233     char key[5] = {0}, *value;
00234 
00235     size += (size & 1);
00236 
00237     if (size == UINT_MAX)
00238         return -1;
00239     value = av_malloc(size+1);
00240     if (!value)
00241         return -1;
00242     get_buffer(pb, value, size);
00243     value[size]=0;
00244 
00245     AV_WL32(key, tag);
00246 
00247     if(st)
00248         return av_metadata_set2(&st->metadata, key, value,
00249                                     AV_METADATA_DONT_STRDUP_VAL);
00250     else
00251     return av_metadata_set2(&s->metadata, key, value,
00252                                   AV_METADATA_DONT_STRDUP_VAL);
00253 }
00254 
00255 static void avi_read_info(AVFormatContext *s, uint64_t end)
00256 {
00257     while (url_ftell(s->pb) < end) {
00258         uint32_t tag  = get_le32(s->pb);
00259         uint32_t size = get_le32(s->pb);
00260         avi_read_tag(s, NULL, tag, size);
00261     }
00262 }
00263 
00264 static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
00265 {
00266     AVIContext *avi = s->priv_data;
00267     ByteIOContext *pb = s->pb;
00268     unsigned int tag, tag1, handler;
00269     int codec_type, stream_index, frame_period, bit_rate;
00270     unsigned int size;
00271     int i;
00272     AVStream *st;
00273     AVIStream *ast = NULL;
00274     int avih_width=0, avih_height=0;
00275     int amv_file_format=0;
00276     uint64_t list_end = 0;
00277 
00278     avi->stream_index= -1;
00279 
00280     if (get_riff(s, pb) < 0)
00281         return -1;
00282 
00283     avi->fsize = url_fsize(pb);
00284     if(avi->fsize<=0)
00285         avi->fsize= avi->riff_end == 8 ? INT64_MAX : avi->riff_end;
00286 
00287     /* first list tag */
00288     stream_index = -1;
00289     codec_type = -1;
00290     frame_period = 0;
00291     for(;;) {
00292         if (url_feof(pb))
00293             goto fail;
00294         tag = get_le32(pb);
00295         size = get_le32(pb);
00296 #ifdef DEBUG
00297         print_tag("tag", tag, size);
00298 #endif
00299 
00300         switch(tag) {
00301         case MKTAG('L', 'I', 'S', 'T'):
00302             list_end = url_ftell(pb) + size;
00303             /* Ignored, except at start of video packets. */
00304             tag1 = get_le32(pb);
00305 #ifdef DEBUG
00306             print_tag("list", tag1, 0);
00307 #endif
00308             if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
00309                 avi->movi_list = url_ftell(pb) - 4;
00310                 if(size) avi->movi_end = avi->movi_list + size + (size & 1);
00311                 else     avi->movi_end = url_fsize(pb);
00312                 dprintf(NULL, "movi end=%"PRIx64"\n", avi->movi_end);
00313                 goto end_of_header;
00314             }
00315             else if (tag1 == MKTAG('I', 'N', 'F', 'O'))
00316                 avi_read_info(s, list_end);
00317 
00318             break;
00319         case MKTAG('d', 'm', 'l', 'h'):
00320             avi->is_odml = 1;
00321             url_fskip(pb, size + (size & 1));
00322             break;
00323         case MKTAG('a', 'm', 'v', 'h'):
00324             amv_file_format=1;
00325         case MKTAG('a', 'v', 'i', 'h'):
00326             /* AVI header */
00327             /* using frame_period is bad idea */
00328             frame_period = get_le32(pb);
00329             bit_rate = get_le32(pb) * 8;
00330             get_le32(pb);
00331             avi->non_interleaved |= get_le32(pb) & AVIF_MUSTUSEINDEX;
00332 
00333             url_fskip(pb, 2 * 4);
00334             get_le32(pb);
00335             get_le32(pb);
00336             avih_width=get_le32(pb);
00337             avih_height=get_le32(pb);
00338 
00339             url_fskip(pb, size - 10 * 4);
00340             break;
00341         case MKTAG('s', 't', 'r', 'h'):
00342             /* stream header */
00343 
00344             tag1 = get_le32(pb);
00345             handler = get_le32(pb); /* codec tag */
00346 
00347             if(tag1 == MKTAG('p', 'a', 'd', 's')){
00348                 url_fskip(pb, size - 8);
00349                 break;
00350             }else{
00351                 stream_index++;
00352                 st = av_new_stream(s, stream_index);
00353                 if (!st)
00354                     goto fail;
00355 
00356                 ast = av_mallocz(sizeof(AVIStream));
00357                 if (!ast)
00358                     goto fail;
00359                 st->priv_data = ast;
00360             }
00361             if(amv_file_format)
00362                 tag1 = stream_index ? MKTAG('a','u','d','s') : MKTAG('v','i','d','s');
00363 
00364 #ifdef DEBUG
00365             print_tag("strh", tag1, -1);
00366 #endif
00367             if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
00368                 int64_t dv_dur;
00369 
00370                 /*
00371                  * After some consideration -- I don't think we
00372                  * have to support anything but DV in type1 AVIs.
00373                  */
00374                 if (s->nb_streams != 1)
00375                     goto fail;
00376 
00377                 if (handler != MKTAG('d', 'v', 's', 'd') &&
00378                     handler != MKTAG('d', 'v', 'h', 'd') &&
00379                     handler != MKTAG('d', 'v', 's', 'l'))
00380                    goto fail;
00381 
00382                 ast = s->streams[0]->priv_data;
00383                 av_freep(&s->streams[0]->codec->extradata);
00384                 av_freep(&s->streams[0]);
00385                 s->nb_streams = 0;
00386                 if (CONFIG_DV_DEMUXER) {
00387                     avi->dv_demux = dv_init_demux(s);
00388                     if (!avi->dv_demux)
00389                         goto fail;
00390                 }
00391                 s->streams[0]->priv_data = ast;
00392                 url_fskip(pb, 3 * 4);
00393                 ast->scale = get_le32(pb);
00394                 ast->rate = get_le32(pb);
00395                 url_fskip(pb, 4);  /* start time */
00396 
00397                 dv_dur = get_le32(pb);
00398                 if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
00399                     dv_dur *= AV_TIME_BASE;
00400                     s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
00401                 }
00402                 /*
00403                  * else, leave duration alone; timing estimation in utils.c
00404                  *      will make a guess based on bitrate.
00405                  */
00406 
00407                 stream_index = s->nb_streams - 1;
00408                 url_fskip(pb, size - 9*4);
00409                 break;
00410             }
00411 
00412             assert(stream_index < s->nb_streams);
00413             st->codec->stream_codec_tag= handler;
00414 
00415             get_le32(pb); /* flags */
00416             get_le16(pb); /* priority */
00417             get_le16(pb); /* language */
00418             get_le32(pb); /* initial frame */
00419             ast->scale = get_le32(pb);
00420             ast->rate = get_le32(pb);
00421             if(!(ast->scale && ast->rate)){
00422                 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);
00423                 if(frame_period){
00424                     ast->rate = 1000000;
00425                     ast->scale = frame_period;
00426                 }else{
00427                     ast->rate = 25;
00428                     ast->scale = 1;
00429                 }
00430             }
00431             av_set_pts_info(st, 64, ast->scale, ast->rate);
00432 
00433             ast->cum_len=get_le32(pb); /* start */
00434             st->nb_frames = get_le32(pb);
00435 
00436             st->start_time = 0;
00437             get_le32(pb); /* buffer size */
00438             get_le32(pb); /* quality */
00439             ast->sample_size = get_le32(pb); /* sample ssize */
00440             ast->cum_len *= FFMAX(1, ast->sample_size);
00441 //            av_log(s, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
00442 
00443             switch(tag1) {
00444             case MKTAG('v', 'i', 'd', 's'):
00445                 codec_type = AVMEDIA_TYPE_VIDEO;
00446 
00447                 ast->sample_size = 0;
00448                 break;
00449             case MKTAG('a', 'u', 'd', 's'):
00450                 codec_type = AVMEDIA_TYPE_AUDIO;
00451                 break;
00452             case MKTAG('t', 'x', 't', 's'):
00453                 //FIXME
00454                 codec_type = AVMEDIA_TYPE_DATA; //AVMEDIA_TYPE_SUB ?  FIXME
00455                 break;
00456             case MKTAG('d', 'a', 't', 's'):
00457                 codec_type = AVMEDIA_TYPE_DATA;
00458                 break;
00459             default:
00460                 av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
00461                 goto fail;
00462             }
00463             if(ast->sample_size == 0)
00464                 st->duration = st->nb_frames;
00465             ast->frame_offset= ast->cum_len;
00466             url_fskip(pb, size - 12 * 4);
00467             break;
00468         case MKTAG('s', 't', 'r', 'f'):
00469             /* stream header */
00470             if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
00471                 url_fskip(pb, size);
00472             } else {
00473                 uint64_t cur_pos = url_ftell(pb);
00474                 if (cur_pos < list_end)
00475                     size = FFMIN(size, list_end - cur_pos);
00476                 st = s->streams[stream_index];
00477                 switch(codec_type) {
00478                 case AVMEDIA_TYPE_VIDEO:
00479                     if(amv_file_format){
00480                         st->codec->width=avih_width;
00481                         st->codec->height=avih_height;
00482                         st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
00483                         st->codec->codec_id = CODEC_ID_AMV;
00484                         url_fskip(pb, size);
00485                         break;
00486                     }
00487                     get_le32(pb); /* size */
00488                     st->codec->width = get_le32(pb);
00489                     st->codec->height = (int32_t)get_le32(pb);
00490                     get_le16(pb); /* panes */
00491                     st->codec->bits_per_coded_sample= get_le16(pb); /* depth */
00492                     tag1 = get_le32(pb);
00493                     get_le32(pb); /* ImageSize */
00494                     get_le32(pb); /* XPelsPerMeter */
00495                     get_le32(pb); /* YPelsPerMeter */
00496                     get_le32(pb); /* ClrUsed */
00497                     get_le32(pb); /* ClrImportant */
00498 
00499                     if (tag1 == MKTAG('D', 'X', 'S', 'B') || tag1 == MKTAG('D','X','S','A')) {
00500                         st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
00501                         st->codec->codec_tag = tag1;
00502                         st->codec->codec_id = CODEC_ID_XSUB;
00503                         break;
00504                     }
00505 
00506                     if(size > 10*4 && size<(1<<30)){
00507                         st->codec->extradata_size= size - 10*4;
00508                         st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
00509                         if (!st->codec->extradata) {
00510                             st->codec->extradata_size= 0;
00511                             return AVERROR(ENOMEM);
00512                         }
00513                         get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
00514                     }
00515 
00516                     if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
00517                         get_byte(pb);
00518 
00519                     /* Extract palette from extradata if bpp <= 8. */
00520                     /* This code assumes that extradata contains only palette. */
00521                     /* This is true for all paletted codecs implemented in FFmpeg. */
00522                     if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
00523                         st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
00524 #if HAVE_BIGENDIAN
00525                         for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
00526                             st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
00527 #else
00528                         memcpy(st->codec->palctrl->palette, st->codec->extradata,
00529                                FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
00530 #endif
00531                         st->codec->palctrl->palette_changed = 1;
00532                     }
00533 
00534 #ifdef DEBUG
00535                     print_tag("video", tag1, 0);
00536 #endif
00537                     st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
00538                     st->codec->codec_tag = tag1;
00539                     st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
00540                     st->need_parsing = AVSTREAM_PARSE_HEADERS; // This is needed to get the pict type which is necessary for generating correct pts.
00541                     // Support "Resolution 1:1" for Avid AVI Codec
00542                     if(tag1 == MKTAG('A', 'V', 'R', 'n') &&
00543                        st->codec->extradata_size >= 31 &&
00544                        !memcmp(&st->codec->extradata[28], "1:1", 3))
00545                         st->codec->codec_id = CODEC_ID_RAWVIDEO;
00546 
00547                     if(st->codec->codec_tag==0 && st->codec->height > 0 && st->codec->extradata_size < 1U<<30){
00548                         st->codec->extradata_size+= 9;
00549                         st->codec->extradata= av_realloc(st->codec->extradata, st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
00550                         if(st->codec->extradata)
00551                             memcpy(st->codec->extradata + st->codec->extradata_size - 9, "BottomUp", 9);
00552                     }
00553                     st->codec->height= FFABS(st->codec->height);
00554 
00555 //                    url_fskip(pb, size - 5 * 4);
00556                     break;
00557                 case AVMEDIA_TYPE_AUDIO:
00558                     ff_get_wav_header(pb, st->codec, size);
00559                     if(ast->sample_size && st->codec->block_align && ast->sample_size != st->codec->block_align){
00560                         av_log(s, AV_LOG_WARNING, "sample size (%d) != block align (%d)\n", ast->sample_size, st->codec->block_align);
00561                         ast->sample_size= st->codec->block_align;
00562                     }
00563                     if (size&1) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
00564                         url_fskip(pb, 1);
00565                     /* Force parsing as several audio frames can be in
00566                      * one packet and timestamps refer to packet start. */
00567                     st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
00568                     /* ADTS header is in extradata, AAC without header must be
00569                      * stored as exact frames. Parser not needed and it will
00570                      * fail. */
00571                     if (st->codec->codec_id == CODEC_ID_AAC && st->codec->extradata_size)
00572                         st->need_parsing = AVSTREAM_PARSE_NONE;
00573                     /* AVI files with Xan DPCM audio (wrongly) declare PCM
00574                      * audio in the header but have Axan as stream_code_tag. */
00575                     if (st->codec->stream_codec_tag == AV_RL32("Axan")){
00576                         st->codec->codec_id  = CODEC_ID_XAN_DPCM;
00577                         st->codec->codec_tag = 0;
00578                     }
00579                     if (amv_file_format)
00580                         st->codec->codec_id  = CODEC_ID_ADPCM_IMA_AMV;
00581                     break;
00582                 default:
00583                     st->codec->codec_type = AVMEDIA_TYPE_DATA;
00584                     st->codec->codec_id= CODEC_ID_NONE;
00585                     st->codec->codec_tag= 0;
00586                     url_fskip(pb, size);
00587                     break;
00588                 }
00589             }
00590             break;
00591         case MKTAG('i', 'n', 'd', 'x'):
00592             i= url_ftell(pb);
00593             if(!url_is_streamed(pb) && !(s->flags & AVFMT_FLAG_IGNIDX)){
00594                 read_braindead_odml_indx(s, 0);
00595             }
00596             url_fseek(pb, i+size, SEEK_SET);
00597             break;
00598         case MKTAG('v', 'p', 'r', 'p'):
00599             if(stream_index < (unsigned)s->nb_streams && size > 9*4){
00600                 AVRational active, active_aspect;
00601 
00602                 st = s->streams[stream_index];
00603                 get_le32(pb);
00604                 get_le32(pb);
00605                 get_le32(pb);
00606                 get_le32(pb);
00607                 get_le32(pb);
00608 
00609                 active_aspect.den= get_le16(pb);
00610                 active_aspect.num= get_le16(pb);
00611                 active.num       = get_le32(pb);
00612                 active.den       = get_le32(pb);
00613                 get_le32(pb); //nbFieldsPerFrame
00614 
00615                 if(active_aspect.num && active_aspect.den && active.num && active.den){
00616                     st->sample_aspect_ratio= av_div_q(active_aspect, active);
00617 //av_log(s, AV_LOG_ERROR, "vprp %d/%d %d/%d\n", active_aspect.num, active_aspect.den, active.num, active.den);
00618                 }
00619                 size -= 9*4;
00620             }
00621             url_fseek(pb, size, SEEK_CUR);
00622             break;
00623         case MKTAG('s', 't', 'r', 'n'):
00624             if(s->nb_streams){
00625                 avi_read_tag(s, s->streams[s->nb_streams-1], tag, size);
00626                 break;
00627             }
00628         default:
00629             if(size > 1000000){
00630                 av_log(s, AV_LOG_ERROR, "Something went wrong during header parsing, "
00631                                         "I will ignore it and try to continue anyway.\n");
00632                 avi->movi_list = url_ftell(pb) - 4;
00633                 avi->movi_end  = url_fsize(pb);
00634                 goto end_of_header;
00635             }
00636             /* skip tag */
00637             size += (size & 1);
00638             url_fskip(pb, size);
00639             break;
00640         }
00641     }
00642  end_of_header:
00643     /* check stream number */
00644     if (stream_index != s->nb_streams - 1) {
00645     fail:
00646         return -1;
00647     }
00648 
00649     if(!avi->index_loaded && !url_is_streamed(pb))
00650         avi_load_index(s);
00651     avi->index_loaded = 1;
00652     avi->non_interleaved |= guess_ni_flag(s);
00653     for(i=0; i<s->nb_streams; i++){
00654         AVStream *st = s->streams[i];
00655         if(st->nb_index_entries)
00656             break;
00657     }
00658     if(i==s->nb_streams && avi->non_interleaved) {
00659         av_log(s, AV_LOG_WARNING, "non-interleaved AVI without index, switching to interleaved\n");
00660         avi->non_interleaved=0;
00661     }
00662 
00663     if(avi->non_interleaved) {
00664         av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
00665         clean_index(s);
00666     }
00667 
00668     return 0;
00669 }
00670 
00671 static int get_stream_idx(int *d){
00672     if(    d[0] >= '0' && d[0] <= '9'
00673         && d[1] >= '0' && d[1] <= '9'){
00674         return (d[0] - '0') * 10 + (d[1] - '0');
00675     }else{
00676         return 100; //invalid stream ID
00677     }
00678 }
00679 
00680 static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
00681 {
00682     AVIContext *avi = s->priv_data;
00683     ByteIOContext *pb = s->pb;
00684     int n, d[8];
00685     unsigned int size;
00686     int64_t i, sync;
00687     void* dstr;
00688 
00689     if (CONFIG_DV_DEMUXER && avi->dv_demux) {
00690         int size = dv_get_packet(avi->dv_demux, pkt);
00691         if (size >= 0)
00692             return size;
00693     }
00694 
00695     if(avi->non_interleaved){
00696         int best_stream_index = 0;
00697         AVStream *best_st= NULL;
00698         AVIStream *best_ast;
00699         int64_t best_ts= INT64_MAX;
00700         int i;
00701 
00702         for(i=0; i<s->nb_streams; i++){
00703             AVStream *st = s->streams[i];
00704             AVIStream *ast = st->priv_data;
00705             int64_t ts= ast->frame_offset;
00706             int64_t last_ts;
00707 
00708             if(!st->nb_index_entries)
00709                 continue;
00710 
00711             last_ts = st->index_entries[st->nb_index_entries - 1].timestamp;
00712             if(!ast->remaining && ts > last_ts)
00713                 continue;
00714 
00715             ts = av_rescale_q(ts, st->time_base, (AVRational){FFMAX(1, ast->sample_size), AV_TIME_BASE});
00716 
00717 //            av_log(s, AV_LOG_DEBUG, "%"PRId64" %d/%d %"PRId64"\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
00718             if(ts < best_ts){
00719                 best_ts= ts;
00720                 best_st= st;
00721                 best_stream_index= i;
00722             }
00723         }
00724         if(!best_st)
00725             return -1;
00726 
00727         best_ast = best_st->priv_data;
00728         best_ts = av_rescale_q(best_ts, (AVRational){FFMAX(1, best_ast->sample_size), AV_TIME_BASE}, best_st->time_base);
00729         if(best_ast->remaining)
00730             i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
00731         else{
00732             i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
00733             if(i>=0)
00734                 best_ast->frame_offset= best_st->index_entries[i].timestamp;
00735         }
00736 
00737 //        av_log(s, AV_LOG_DEBUG, "%d\n", i);
00738         if(i>=0){
00739             int64_t pos= best_st->index_entries[i].pos;
00740             pos += best_ast->packet_size - best_ast->remaining;
00741             url_fseek(s->pb, pos + 8, SEEK_SET);
00742 //        av_log(s, AV_LOG_DEBUG, "pos=%"PRId64"\n", pos);
00743 
00744             assert(best_ast->remaining <= best_ast->packet_size);
00745 
00746             avi->stream_index= best_stream_index;
00747             if(!best_ast->remaining)
00748                 best_ast->packet_size=
00749                 best_ast->remaining= best_st->index_entries[i].size;
00750         }
00751     }
00752 
00753 resync:
00754     if(avi->stream_index >= 0){
00755         AVStream *st= s->streams[ avi->stream_index ];
00756         AVIStream *ast= st->priv_data;
00757         int size, err;
00758 
00759         if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
00760             size= INT_MAX;
00761         else if(ast->sample_size < 32)
00762             // arbitrary multiplier to avoid tiny packets for raw PCM data
00763             size= 1024*ast->sample_size;
00764         else
00765             size= ast->sample_size;
00766 
00767         if(size > ast->remaining)
00768             size= ast->remaining;
00769         avi->last_pkt_pos= url_ftell(pb);
00770         err= av_get_packet(pb, pkt, size);
00771         if(err<0)
00772             return err;
00773 
00774         if(ast->has_pal && pkt->data && pkt->size<(unsigned)INT_MAX/2){
00775             void *ptr= av_realloc(pkt->data, pkt->size + 4*256 + FF_INPUT_BUFFER_PADDING_SIZE);
00776             if(ptr){
00777             ast->has_pal=0;
00778             pkt->size += 4*256;
00779             pkt->data= ptr;
00780                 memcpy(pkt->data + pkt->size - 4*256, ast->pal, 4*256);
00781             }else
00782                 av_log(s, AV_LOG_ERROR, "Failed to append palette\n");
00783         }
00784 
00785         if (CONFIG_DV_DEMUXER && avi->dv_demux) {
00786             dstr = pkt->destruct;
00787             size = dv_produce_packet(avi->dv_demux, pkt,
00788                                     pkt->data, pkt->size);
00789             pkt->destruct = dstr;
00790             pkt->flags |= AV_PKT_FLAG_KEY;
00791         } else {
00792             /* XXX: How to handle B-frames in AVI? */
00793             pkt->dts = ast->frame_offset;
00794 //                pkt->dts += ast->start;
00795             if(ast->sample_size)
00796                 pkt->dts /= ast->sample_size;
00797 //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);
00798             pkt->stream_index = avi->stream_index;
00799 
00800             if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
00801                 AVIndexEntry *e;
00802                 int index;
00803                 assert(st->index_entries);
00804 
00805                 index= av_index_search_timestamp(st, ast->frame_offset, 0);
00806                 e= &st->index_entries[index];
00807 
00808                 if(index >= 0 && e->timestamp == ast->frame_offset){
00809                     if (e->flags & AVINDEX_KEYFRAME)
00810                         pkt->flags |= AV_PKT_FLAG_KEY;
00811                 }
00812             } else {
00813                 pkt->flags |= AV_PKT_FLAG_KEY;
00814             }
00815             if(ast->sample_size)
00816                 ast->frame_offset += pkt->size;
00817             else
00818                 ast->frame_offset++;
00819         }
00820         ast->remaining -= size;
00821         if(!ast->remaining){
00822             avi->stream_index= -1;
00823             ast->packet_size= 0;
00824         }
00825 
00826         return size;
00827     }
00828 
00829     memset(d, -1, sizeof(int)*8);
00830     for(i=sync=url_ftell(pb); !url_feof(pb); i++) {
00831         int j;
00832 
00833         for(j=0; j<7; j++)
00834             d[j]= d[j+1];
00835         d[7]= get_byte(pb);
00836 
00837         size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
00838 
00839         n= get_stream_idx(d+2);
00840 //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);
00841         if(i + (uint64_t)size > avi->fsize || d[0]<0)
00842             continue;
00843 
00844         //parse ix##
00845         if(  (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
00846         //parse JUNK
00847            ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')
00848            ||(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')){
00849             url_fskip(pb, size);
00850 //av_log(s, AV_LOG_DEBUG, "SKIP\n");
00851             goto resync;
00852         }
00853 
00854         //parse stray LIST
00855         if(d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T'){
00856             url_fskip(pb, 4);
00857             goto resync;
00858         }
00859 
00860         n= get_stream_idx(d);
00861 
00862         if(!((i-avi->last_pkt_pos)&1) && get_stream_idx(d+1) < s->nb_streams)
00863             continue;
00864 
00865         //detect ##ix chunk and skip
00866         if(d[2] == 'i' && d[3] == 'x' && n < s->nb_streams){
00867             url_fskip(pb, size);
00868             goto resync;
00869         }
00870 
00871         //parse ##dc/##wb
00872         if(n < s->nb_streams){
00873             AVStream *st;
00874             AVIStream *ast;
00875             st = s->streams[n];
00876             ast = st->priv_data;
00877 
00878             if(s->nb_streams>=2){
00879                 AVStream *st1  = s->streams[1];
00880                 AVIStream *ast1= st1->priv_data;
00881                 //workaround for broken small-file-bug402.avi
00882                 if(   d[2] == 'w' && d[3] == 'b'
00883                    && n==0
00884                    && st ->codec->codec_type == AVMEDIA_TYPE_VIDEO
00885                    && st1->codec->codec_type == AVMEDIA_TYPE_AUDIO
00886                    && ast->prefix == 'd'*256+'c'
00887                    && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
00888                   ){
00889                     n=1;
00890                     st = st1;
00891                     ast = ast1;
00892                     av_log(s, AV_LOG_WARNING, "Invalid stream + prefix combination, assuming audio.\n");
00893                 }
00894             }
00895 
00896 
00897             if(   (st->discard >= AVDISCARD_DEFAULT && size==0)
00898                /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & AV_PKT_FLAG_KEY))*/ //FIXME needs a little reordering
00899                || st->discard >= AVDISCARD_ALL){
00900                 if(ast->sample_size) ast->frame_offset += size;
00901                 else                 ast->frame_offset++;
00902                 url_fskip(pb, size);
00903                 goto resync;
00904             }
00905 
00906             if (d[2] == 'p' && d[3] == 'c' && size<=4*256+4) {
00907                 int k = get_byte(pb);
00908                 int last = (k + get_byte(pb) - 1) & 0xFF;
00909 
00910                 get_le16(pb); //flags
00911 
00912                 for (; k <= last; k++)
00913                     ast->pal[k] = get_be32(pb)>>8;// b + (g << 8) + (r << 16);
00914                 ast->has_pal= 1;
00915                 goto resync;
00916             } else if(   ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
00917                          d[2]*256+d[3] == ast->prefix /*||
00918                          (d[2] == 'd' && d[3] == 'c') ||
00919                          (d[2] == 'w' && d[3] == 'b')*/) {
00920 
00921 //av_log(s, AV_LOG_DEBUG, "OK\n");
00922                 if(d[2]*256+d[3] == ast->prefix)
00923                     ast->prefix_count++;
00924                 else{
00925                     ast->prefix= d[2]*256+d[3];
00926                     ast->prefix_count= 0;
00927                 }
00928 
00929                 avi->stream_index= n;
00930                 ast->packet_size= size + 8;
00931                 ast->remaining= size;
00932 
00933                 if(size || !ast->sample_size){
00934                     uint64_t pos= url_ftell(pb) - 8;
00935                     if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){
00936                         av_add_index_entry(st, pos, ast->frame_offset, size, 0, AVINDEX_KEYFRAME);
00937                     }
00938                 }
00939                 goto resync;
00940             }
00941         }
00942     }
00943 
00944     return AVERROR_EOF;
00945 }
00946 
00947 /* XXX: We make the implicit supposition that the positions are sorted
00948    for each stream. */
00949 static int avi_read_idx1(AVFormatContext *s, int size)
00950 {
00951     AVIContext *avi = s->priv_data;
00952     ByteIOContext *pb = s->pb;
00953     int nb_index_entries, i;
00954     AVStream *st;
00955     AVIStream *ast;
00956     unsigned int index, tag, flags, pos, len;
00957     unsigned last_pos= -1;
00958 
00959     nb_index_entries = size / 16;
00960     if (nb_index_entries <= 0)
00961         return -1;
00962 
00963     /* Read the entries and sort them in each stream component. */
00964     for(i = 0; i < nb_index_entries; i++) {
00965         tag = get_le32(pb);
00966         flags = get_le32(pb);
00967         pos = get_le32(pb);
00968         len = get_le32(pb);
00969 #if defined(DEBUG_SEEK)
00970         av_log(s, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
00971                i, tag, flags, pos, len);
00972 #endif
00973         if(i==0 && pos > avi->movi_list)
00974             avi->movi_list= 0; //FIXME better check
00975         pos += avi->movi_list;
00976 
00977         index = ((tag & 0xff) - '0') * 10;
00978         index += ((tag >> 8) & 0xff) - '0';
00979         if (index >= s->nb_streams)
00980             continue;
00981         st = s->streams[index];
00982         ast = st->priv_data;
00983 
00984 #if defined(DEBUG_SEEK)
00985         av_log(s, AV_LOG_DEBUG, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
00986 #endif
00987         if(url_feof(pb))
00988             return -1;
00989 
00990         if(last_pos == pos)
00991             avi->non_interleaved= 1;
00992         else if(len || !ast->sample_size)
00993             av_add_index_entry(st, pos, ast->cum_len, len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
00994         if(ast->sample_size)
00995             ast->cum_len += len;
00996         else
00997             ast->cum_len ++;
00998         last_pos= pos;
00999     }
01000     return 0;
01001 }
01002 
01003 static int guess_ni_flag(AVFormatContext *s){
01004     int i;
01005     int64_t last_start=0;
01006     int64_t first_end= INT64_MAX;
01007     int64_t oldpos= url_ftell(s->pb);
01008 
01009     for(i=0; i<s->nb_streams; i++){
01010         AVStream *st = s->streams[i];
01011         int n= st->nb_index_entries;
01012         unsigned int size;
01013 
01014         if(n <= 0)
01015             continue;
01016 
01017         if(n >= 2){
01018             int64_t pos= st->index_entries[0].pos;
01019             url_fseek(s->pb, pos + 4, SEEK_SET);
01020             size= get_le32(s->pb);
01021             if(pos + size > st->index_entries[1].pos)
01022                 last_start= INT64_MAX;
01023         }
01024 
01025         if(st->index_entries[0].pos > last_start)
01026             last_start= st->index_entries[0].pos;
01027         if(st->index_entries[n-1].pos < first_end)
01028             first_end= st->index_entries[n-1].pos;
01029     }
01030     url_fseek(s->pb, oldpos, SEEK_SET);
01031     return last_start > first_end;
01032 }
01033 
01034 static int avi_load_index(AVFormatContext *s)
01035 {
01036     AVIContext *avi = s->priv_data;
01037     ByteIOContext *pb = s->pb;
01038     uint32_t tag, size;
01039     int64_t pos= url_ftell(pb);
01040     int ret = -1;
01041 
01042     if (url_fseek(pb, avi->movi_end, SEEK_SET) < 0)
01043         goto the_end; // maybe truncated file
01044 #ifdef DEBUG_SEEK
01045     printf("movi_end=0x%"PRIx64"\n", avi->movi_end);
01046 #endif
01047     for(;;) {
01048         if (url_feof(pb))
01049             break;
01050         tag = get_le32(pb);
01051         size = get_le32(pb);
01052 #ifdef DEBUG_SEEK
01053         printf("tag=%c%c%c%c size=0x%x\n",
01054                tag & 0xff,
01055                (tag >> 8) & 0xff,
01056                (tag >> 16) & 0xff,
01057                (tag >> 24) & 0xff,
01058                size);
01059 #endif
01060         switch(tag) {
01061         case MKTAG('i', 'd', 'x', '1'):
01062             if (avi_read_idx1(s, size) < 0)
01063                 goto skip;
01064             ret = 0;
01065                 goto the_end;
01066             break;
01067         default:
01068         skip:
01069             size += (size & 1);
01070             if (url_fseek(pb, size, SEEK_CUR) < 0)
01071                 goto the_end; // something is wrong here
01072             break;
01073         }
01074     }
01075  the_end:
01076     url_fseek(pb, pos, SEEK_SET);
01077     return ret;
01078 }
01079 
01080 static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
01081 {
01082     AVIContext *avi = s->priv_data;
01083     AVStream *st;
01084     int i, index;
01085     int64_t pos;
01086     AVIStream *ast;
01087 
01088     if (!avi->index_loaded) {
01089         /* we only load the index on demand */
01090         avi_load_index(s);
01091         avi->index_loaded = 1;
01092     }
01093     assert(stream_index>= 0);
01094 
01095     st = s->streams[stream_index];
01096     ast= st->priv_data;
01097     index= av_index_search_timestamp(st, timestamp * FFMAX(ast->sample_size, 1), flags);
01098     if(index<0)
01099         return -1;
01100 
01101     /* find the position */
01102     pos = st->index_entries[index].pos;
01103     timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1);
01104 
01105 //    av_log(s, AV_LOG_DEBUG, "XX %"PRId64" %d %"PRId64"\n", timestamp, index, st->index_entries[index].timestamp);
01106 
01107     if (CONFIG_DV_DEMUXER && avi->dv_demux) {
01108         /* One and only one real stream for DV in AVI, and it has video  */
01109         /* offsets. Calling with other stream indexes should have failed */
01110         /* the av_index_search_timestamp call above.                     */
01111         assert(stream_index == 0);
01112 
01113         /* Feed the DV video stream version of the timestamp to the */
01114         /* DV demux so it can synthesize correct timestamps.        */
01115         dv_offset_reset(avi->dv_demux, timestamp);
01116 
01117         url_fseek(s->pb, pos, SEEK_SET);
01118         avi->stream_index= -1;
01119         return 0;
01120     }
01121 
01122     for(i = 0; i < s->nb_streams; i++) {
01123         AVStream *st2 = s->streams[i];
01124         AVIStream *ast2 = st2->priv_data;
01125 
01126         ast2->packet_size=
01127         ast2->remaining= 0;
01128 
01129         if (st2->nb_index_entries <= 0)
01130             continue;
01131 
01132 //        assert(st2->codec->block_align);
01133         assert((int64_t)st2->time_base.num*ast2->rate == (int64_t)st2->time_base.den*ast2->scale);
01134         index = av_index_search_timestamp(
01135                 st2,
01136                 av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
01137                 flags | AVSEEK_FLAG_BACKWARD);
01138         if(index<0)
01139             index=0;
01140 
01141         if(!avi->non_interleaved){
01142             while(index>0 && st2->index_entries[index].pos > pos)
01143                 index--;
01144             while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos)
01145                 index++;
01146         }
01147 
01148 //        av_log(s, AV_LOG_DEBUG, "%"PRId64" %d %"PRId64"\n", timestamp, index, st2->index_entries[index].timestamp);
01149         /* extract the current frame number */
01150         ast2->frame_offset = st2->index_entries[index].timestamp;
01151     }
01152 
01153     /* do the seek */
01154     url_fseek(s->pb, pos, SEEK_SET);
01155     avi->stream_index= -1;
01156     return 0;
01157 }
01158 
01159 static int avi_read_close(AVFormatContext *s)
01160 {
01161     int i;
01162     AVIContext *avi = s->priv_data;
01163 
01164     for(i=0;i<s->nb_streams;i++) {
01165         AVStream *st = s->streams[i];
01166         av_free(st->codec->palctrl);
01167     }
01168 
01169     if (avi->dv_demux)
01170         av_free(avi->dv_demux);
01171 
01172     return 0;
01173 }
01174 
01175 static int avi_probe(AVProbeData *p)
01176 {
01177     int i;
01178 
01179     /* check file header */
01180     for(i=0; avi_headers[i][0]; i++)
01181         if(!memcmp(p->buf  , avi_headers[i]  , 4) &&
01182            !memcmp(p->buf+8, avi_headers[i]+4, 4))
01183             return AVPROBE_SCORE_MAX;
01184 
01185     return 0;
01186 }
01187 
01188 AVInputFormat avi_demuxer = {
01189     "avi",
01190     NULL_IF_CONFIG_SMALL("AVI format"),
01191     sizeof(AVIContext),
01192     avi_probe,
01193     avi_read_header,
01194     avi_read_packet,
01195     avi_read_close,
01196     avi_read_seek,
01197     .metadata_conv = ff_avi_metadata_conv,
01198 };