libmpdemux/demux_avi.c

   1 /*
   2  * AVI file parser for DEMUXER v2.9
   3  * Copyright (c) 2001 A'rpi/ESP-team
   4  *
   5  * This file is part of MPlayer.
   6  *
   7  * MPlayer is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * MPlayer is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along
  18  * with MPlayer; if not, write to the Free Software Foundation, Inc.,
  19  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  20  */
  21
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <unistd.h>
  25
  26 #include "config.h"
  27 #include "mp_msg.h"
  28 #include "help_mp.h"
  29
  30 #include "stream/stream.h"
  31 #include "demuxer.h"
  32 #include "stheader.h"
  33
  34 #include "aviheader.h"
  35
  36 demuxer_t* init_avi_with_ogg(demuxer_t* demuxer);
  37 int demux_ogg_open(demuxer_t* demuxer);
  38
  39 extern const demuxer_desc_t demuxer_desc_avi_ni;
  40 extern const demuxer_desc_t demuxer_desc_avi_nini;
  41
  42 // PTS:  0=interleaved  1=BPS-based
  43 int pts_from_bps=1;
  44
  45 // Select ds from ID
  46 static demux_stream_t* demux_avi_select_stream(demuxer_t *demux,
  47                                                unsigned int id)
  48 {
  49   int stream_id=avi_stream_id(id);
  50
  51
  52   if(demux->video->id==-1)
  53     if(demux->v_streams[stream_id])
  54         demux->video->id=stream_id;
  55
  56   if(demux->audio->id==-1)
  57     if(demux->a_streams[stream_id])
  58         demux->audio->id=stream_id;
  59
  60   if(stream_id==demux->audio->id){
  61       if(!demux->audio->sh){
  62         sh_audio_t* sh;
  63         avi_priv_t *priv=demux->priv;
  64         sh=demux->audio->sh=demux->a_streams[stream_id];
  65         mp_msg(MSGT_DEMUX,MSGL_V,"Auto-selected AVI audio ID = %d\n",demux->audio->id);
  66         if(sh->wf){
  67           priv->audio_block_size=sh->wf->nBlockAlign;
  68           if(!priv->audio_block_size){
  69             // for PCM audio we can calculate the blocksize:
  70             if(sh->format==1)
  71                 priv->audio_block_size=sh->wf->nChannels*(sh->wf->wBitsPerSample/8);
  72             else
  73                 priv->audio_block_size=1; // hope the best...
  74           } else {
  75             // workaround old mencoder's bug:
  76             if(sh->audio.dwSampleSize==1 && sh->audio.dwScale==1 &&
  77                (sh->wf->nBlockAlign==1152 || sh->wf->nBlockAlign==576)){
  78                 mp_tmsg(MSGT_DEMUX,MSGL_WARN,"AVI: Working around CBR-MP3 nBlockAlign header bug!\n");
  79                 priv->audio_block_size=1;
  80             }
  81           }
  82         } else {
  83           priv->audio_block_size=sh->audio.dwSampleSize;
  84         }
  85       }
  86       return demux->audio;
  87   }
  88   if(stream_id==demux->video->id){
  89       if(!demux->video->sh){
  90         demux->video->sh=demux->v_streams[stream_id];
  91         mp_msg(MSGT_DEMUX,MSGL_V,"Auto-selected AVI video ID = %d\n",demux->video->id);
  92       }
  93       return demux->video;
  94   }
  95   if(id!=mmioFOURCC('J','U','N','K')){
  96      // unknown
  97      mp_msg(MSGT_DEMUX,MSGL_DBG2,"Unknown chunk: %.4s (%X)\n",(char *) &id,id);
  98      //abort();
  99   }
 100   return NULL;
 101 }
 102
 103 static int valid_fourcc(unsigned int id){
 104     static const char valid[] = "0123456789abcdefghijklmnopqrstuvwxyz"
 105                                 "ABCDEFGHIJKLMNOPQRSTUVWXYZ_";
 106     unsigned char* fcc=(unsigned char*)(&id);
 107     return strchr(valid, fcc[0]) && strchr(valid, fcc[1]) &&
 108            strchr(valid, fcc[2]) && strchr(valid, fcc[3]);
 109 }
 110
 111 static int valid_stream_id(unsigned int id) {
 112     unsigned char* fcc=(unsigned char*)(&id);
 113     return fcc[0] >= '0' && fcc[0] <= '9' && fcc[1] >= '0' && fcc[1] <= '9' &&
 114            ((fcc[2] == 'w' && fcc[3] == 'b') || (fcc[2] == 'd' && fcc[3] == 'c'));
 115 }
 116
 117 static int choose_chunk_len(unsigned int len1,unsigned int len2){
 118     // len1 has a bit more priority than len2. len1!=len2
 119     // Note: this is a first-idea-logic, may be wrong. comments welcomed.
 120
 121     // prefer small frames rather than 0
 122     if(!len1) return (len2>0x80000) ? len1 : len2;
 123     if(!len2) return (len1>0x100000) ? len2 : len1;
 124
 125     // choose the smaller value:
 126     return (len1<len2)? len1 : len2;
 127 }
 128
 129 static int demux_avi_read_packet(demuxer_t *demux,demux_stream_t *ds,unsigned int id,unsigned int len,int idxpos,int flags){
 130   avi_priv_t *priv=demux->priv;
 131   int skip;
 132   float pts=0;
 133
 134   mp_dbg(MSGT_DEMUX,MSGL_DBG3,"demux_avi.read_packet: %X\n",id);
 135
 136   if(ds==demux->audio){
 137       if(priv->pts_corrected==0){
 138           if(priv->pts_has_video){
 139               // we have video pts now
 140               float delay=0;
 141               if(((sh_audio_t*)(ds->sh))->wf->nAvgBytesPerSec)
 142                   delay=(float)priv->pts_corr_bytes/((sh_audio_t*)(ds->sh))->wf->nAvgBytesPerSec;
 143               mp_msg(MSGT_DEMUX,MSGL_V,"XXX initial  v_pts=%5.3f  a_pos=%d (%5.3f) \n",priv->avi_audio_pts,priv->pts_corr_bytes,delay);
 144               //priv->pts_correction=-priv->avi_audio_pts+delay;
 145               priv->pts_correction=delay-priv->avi_audio_pts;
 146               priv->avi_audio_pts+=priv->pts_correction;
 147               priv->pts_corrected=1;
 148           } else
 149               priv->pts_corr_bytes+=len;
 150       }
 151       if(pts_from_bps){
 152           pts = priv->audio_block_no *
 153             (float)((sh_audio_t*)demux->audio->sh)->audio.dwScale /
 154             (float)((sh_audio_t*)demux->audio->sh)->audio.dwRate;
 155       } else
 156           pts=priv->avi_audio_pts; //+priv->pts_correction;
 157       priv->avi_audio_pts=0;
 158       // update blockcount:
 159       priv->audio_block_no+=priv->audio_block_size ?
 160         ((len+priv->audio_block_size-1)/priv->audio_block_size) : 1;
 161   } else
 162   if(ds==demux->video){
 163      // video
 164      if(priv->skip_video_frames>0){
 165        // drop frame (seeking)
 166        --priv->skip_video_frames;
 167        ds=NULL;
 168      }
 169
 170      pts = priv->avi_video_pts = priv->video_pack_no *
 171          (float)((sh_video_t*)demux->video->sh)->video.dwScale /
 172          (float)((sh_video_t*)demux->video->sh)->video.dwRate;
 173
 174      priv->avi_audio_pts=priv->avi_video_pts+priv->pts_correction;
 175      priv->pts_has_video=1;
 176
 177      if(ds) ++priv->video_pack_no;
 178
 179   }
 180
 181   skip=(len+1)&(~1); // total bytes in this chunk
 182
 183   if(ds){
 184     mp_dbg(MSGT_DEMUX,MSGL_DBG2,"DEMUX_AVI: Read %d data bytes from packet %04X\n",len,id);
 185     ds_read_packet(ds,demux->stream,len,pts,idxpos,flags);
 186     skip-=len;
 187   }
 188   skip = FFMAX(skip, 0);
 189   if (avi_stream_id(id) > 99 && id != mmioFOURCC('J','U','N','K'))
 190     skip = FFMIN(skip, 65536);
 191   if(skip){
 192     mp_dbg(MSGT_DEMUX,MSGL_DBG2,"DEMUX_AVI: Skipping %d bytes from packet %04X\n",skip,id);
 193     stream_skip(demux->stream,skip);
 194   }
 195   return ds?1:0;
 196 }
 197
 198 static uint32_t avi_find_id(stream_t *stream) {
 199   uint32_t id = stream_read_dword_le(stream);
 200   if (!id) {
 201     mp_msg(MSGT_DEMUX, MSGL_WARN, "Incomplete stream? Trying resync.\n");
 202     do {
 203       id = stream_read_dword_le(stream);
 204       if (stream_eof(stream)) return 0;
 205     } while (avi_stream_id(id) > 99);
 206   }
 207   return id;
 208 }
 209
 210 // return value:
 211 //     0 = EOF or no stream found
 212 //     1 = successfully read a packet
 213 static int demux_avi_fill_buffer(demuxer_t *demux, demux_stream_t *dsds){
 214 avi_priv_t *priv=demux->priv;
 215 unsigned int id=0;
 216 unsigned int len;
 217 int ret=0;
 218 demux_stream_t *ds;
 219
 220 do{
 221   int flags=1;
 222   AVIINDEXENTRY *idx=NULL;
 223   if(priv->idx_size>0 && priv->idx_pos<priv->idx_size){
 224     off_t pos;
 225
 226     idx=&((AVIINDEXENTRY *)priv->idx)[priv->idx_pos++];
 227
 228     if(idx->dwFlags&AVIIF_LIST){
 229       if (!valid_stream_id(idx->ckid))
 230       // LIST
 231       continue;
 232       if (!priv->warned_unaligned)
 233         mp_msg(MSGT_DEMUX, MSGL_WARN, "Looks like unaligned chunk in index, broken AVI file!\n");
 234       priv->warned_unaligned = 1;
 235     }
 236     if(!demux_avi_select_stream(demux,idx->ckid)){
 237       mp_dbg(MSGT_DEMUX,MSGL_DBG3,"Skip chunk %.4s (0x%X)  \n",(char *)&idx->ckid,(unsigned int)idx->ckid);
 238       continue; // skip this chunk
 239     }
 240
 241     pos = (off_t)priv->idx_offset+AVI_IDX_OFFSET(idx);
 242     if((pos<demux->movi_start || pos>=demux->movi_end) && (demux->movi_end>demux->movi_start) && (demux->stream->flags & MP_STREAM_SEEK)){
 243       mp_msg(MSGT_DEMUX,MSGL_V,"ChunkOffset out of range!   idx=0x%"PRIX64"  \n",(int64_t)pos);
 244       continue;
 245     }
 246     stream_seek(demux->stream,pos);
 247     demux->filepos=stream_tell(demux->stream);
 248     id=stream_read_dword_le(demux->stream);
 249     if(stream_eof(demux->stream)) return 0; // EOF!
 250
 251     if(id!=idx->ckid){
 252       mp_msg(MSGT_DEMUX,MSGL_V,"ChunkID mismatch! raw=%.4s idx=%.4s  \n",(char *)&id,(char *)&idx->ckid);
 253       if(valid_fourcc(idx->ckid))
 254           id=idx->ckid; // use index if valid
 255       else
 256           if(!valid_fourcc(id)) continue; // drop chunk if both id and idx bad
 257     }
 258     len=stream_read_dword_le(demux->stream);
 259     if((len!=idx->dwChunkLength)&&((len+1)!=idx->dwChunkLength)){
 260       mp_msg(MSGT_DEMUX,MSGL_V,"ChunkSize mismatch! raw=%d idx=%d  \n",len,idx->dwChunkLength);
 261       if(len>0x200000 && idx->dwChunkLength>0x200000) continue; // both values bad :(
 262       len=choose_chunk_len(idx->dwChunkLength,len);
 263     }
 264     if(!(idx->dwFlags&AVIIF_KEYFRAME)) flags=0;
 265   } else {
 266     demux->filepos=stream_tell(demux->stream);
 267     if(demux->filepos>=demux->movi_end && demux->movi_end>demux->movi_start && (demux->stream->flags & MP_STREAM_SEEK)){
 268           demux->stream->eof=1;
 269           return 0;
 270     }
 271     id=avi_find_id(demux->stream);
 272     len=stream_read_dword_le(demux->stream);
 273     if(stream_eof(demux->stream)) return 0; // EOF!
 274
 275     if(id==mmioFOURCC('L','I','S','T') || id==mmioFOURCC('R', 'I', 'F', 'F')){
 276       id=stream_read_dword_le(demux->stream); // list or RIFF type
 277       continue;
 278     }
 279   }
 280
 281   ds=demux_avi_select_stream(demux,id);
 282   if(ds)
 283     if(ds->packs+1>=MAX_PACKS || ds->bytes+len>=MAX_PACK_BYTES){
 284         // this packet will cause a buffer overflow, switch to -ni mode!!!
 285         mp_tmsg(MSGT_DEMUX,MSGL_WARN,"\nBadly interleaved AVI file detected - switching to -ni mode...\n");
 286         if(priv->idx_size>0){
 287             // has index
 288             demux->type=DEMUXER_TYPE_AVI_NI;
 289             demux->desc=&demuxer_desc_avi_ni;
 290             --priv->idx_pos; // hack
 291         } else {
 292             // no index
 293             demux->type=DEMUXER_TYPE_AVI_NINI;
 294             demux->desc=&demuxer_desc_avi_nini;
 295             priv->idx_pos=demux->filepos; // hack
 296         }
 297         priv->idx_pos_v=priv->idx_pos_a=priv->idx_pos;
 298         // quit now, we can't even (no enough buffer memory) read this packet :(
 299         return -1;
 300     }
 301
 302   ret=demux_avi_read_packet(demux,ds,id,len,priv->idx_pos-1,flags);
 303 } while(ret!=1);
 304   return 1;
 305 }
 306
 307
 308 // return value:
 309 //     0 = EOF or no stream found
 310 //     1 = successfully read a packet
 311 static int demux_avi_fill_buffer_ni(demuxer_t *demux,demux_stream_t* ds){
 312 avi_priv_t *priv=demux->priv;
 313 unsigned int id=0;
 314 unsigned int len;
 315 int ret=0;
 316
 317 do{
 318   int flags=1;
 319   AVIINDEXENTRY *idx=NULL;
 320   int idx_pos=0;
 321   demux->filepos=stream_tell(demux->stream);
 322
 323   if(ds==demux->video) idx_pos=priv->idx_pos_v++; else
 324   if(ds==demux->audio) idx_pos=priv->idx_pos_a++; else
 325                        idx_pos=priv->idx_pos++;
 326
 327   if(priv->idx_size>0 && idx_pos<priv->idx_size){
 328     off_t pos;
 329     idx=&((AVIINDEXENTRY *)priv->idx)[idx_pos];
 330
 331     if(idx->dwFlags&AVIIF_LIST){
 332       if (!valid_stream_id(idx->ckid))
 333       // LIST
 334       continue;
 335       if (!priv->warned_unaligned)
 336         mp_msg(MSGT_DEMUX, MSGL_WARN, "Looks like unaligned chunk in index, broken AVI file!\n");
 337       priv->warned_unaligned = 1;
 338     }
 339     if(ds && demux_avi_select_stream(demux,idx->ckid)!=ds){
 340       mp_dbg(MSGT_DEMUX,MSGL_DBG3,"Skip chunk %.4s (0x%X)  \n",(char *)&idx->ckid,(unsigned int)idx->ckid);
 341       continue; // skip this chunk
 342     }
 343
 344     pos = priv->idx_offset+AVI_IDX_OFFSET(idx);
 345     if((pos<demux->movi_start || pos>=demux->movi_end) && (demux->movi_end>demux->movi_start)){
 346       mp_msg(MSGT_DEMUX,MSGL_V,"ChunkOffset out of range!  current=0x%"PRIX64"  idx=0x%"PRIX64"  \n",(int64_t)demux->filepos,(int64_t)pos);
 347       continue;
 348     }
 349     stream_seek(demux->stream,pos);
 350
 351     id=stream_read_dword_le(demux->stream);
 352
 353     if(stream_eof(demux->stream)) return 0;
 354
 355     if(id!=idx->ckid){
 356       mp_msg(MSGT_DEMUX,MSGL_V,"ChunkID mismatch! raw=%.4s idx=%.4s  \n",(char *)&id,(char *)&idx->ckid);
 357       if(valid_fourcc(idx->ckid))
 358           id=idx->ckid; // use index if valid
 359       else
 360           if(!valid_fourcc(id)) continue; // drop chunk if both id and idx bad
 361     }
 362     len=stream_read_dword_le(demux->stream);
 363     if((len!=idx->dwChunkLength)&&((len+1)!=idx->dwChunkLength)){
 364       mp_msg(MSGT_DEMUX,MSGL_V,"ChunkSize mismatch! raw=%d idx=%d  \n",len,idx->dwChunkLength);
 365       if(len>0x200000 && idx->dwChunkLength>0x200000) continue; // both values bad :(
 366       len=choose_chunk_len(idx->dwChunkLength,len);
 367     }
 368     if(!(idx->dwFlags&AVIIF_KEYFRAME)) flags=0;
 369   } else return 0;
 370   ret=demux_avi_read_packet(demux,demux_avi_select_stream(demux,id),id,len,idx_pos,flags);
 371 } while(ret!=1);
 372   return 1;
 373 }
 374
 375
 376 // return value:
 377 //     0 = EOF or no stream found
 378 //     1 = successfully read a packet
 379 static int demux_avi_fill_buffer_nini(demuxer_t *demux,demux_stream_t* ds){
 380 avi_priv_t *priv=demux->priv;
 381 unsigned int id=0;
 382 unsigned int len;
 383 int ret=0;
 384 off_t *fpos=NULL;
 385
 386   if(ds==demux->video) fpos=&priv->idx_pos_v; else
 387   if(ds==demux->audio) fpos=&priv->idx_pos_a; else
 388   return 0;
 389
 390   stream_seek(demux->stream,fpos[0]);
 391
 392 do{
 393
 394   demux->filepos=stream_tell(demux->stream);
 395   if(demux->filepos>=demux->movi_end && (demux->movi_end>demux->movi_start)){
 396           ds->eof=1;
 397           return 0;
 398   }
 399
 400   id=avi_find_id(demux->stream);
 401   len=stream_read_dword_le(demux->stream);
 402
 403   if(stream_eof(demux->stream)) return 0;
 404
 405   if(id==mmioFOURCC('L','I','S','T')){
 406       id=stream_read_dword_le(demux->stream);      // list type
 407       continue;
 408   }
 409
 410   if(id==mmioFOURCC('R','I','F','F')){
 411       mp_msg(MSGT_DEMUX,MSGL_V,"additional RIFF header...\n");
 412       id=stream_read_dword_le(demux->stream);      // "AVIX"
 413       continue;
 414   }
 415
 416   if(ds==demux_avi_select_stream(demux,id)){
 417     // read it!
 418     ret=demux_avi_read_packet(demux,ds,id,len,priv->idx_pos-1,0);
 419   } else {
 420     // skip it!
 421     int skip=(len+1)&(~1); // total bytes in this chunk
 422     stream_skip(demux->stream,skip);
 423   }
 424
 425 } while(ret!=1);
 426   fpos[0]=stream_tell(demux->stream);
 427   return 1;
 428 }
 429
 430 // AVI demuxer parameters:
 431 int index_mode=-1;  // -1=untouched  0=don't use index  1=use (generate) index
 432 char *index_file_save = NULL, *index_file_load = NULL;
 433 int force_ni=0;     // force non-interleaved AVI parsing
 434
 435 void read_avi_header(demuxer_t *demuxer,int index_mode);
 436
 437 static demuxer_t* demux_open_avi(demuxer_t* demuxer){
 438     demux_stream_t *d_audio=demuxer->audio;
 439     demux_stream_t *d_video=demuxer->video;
 440     sh_audio_t *sh_audio=NULL;
 441     sh_video_t *sh_video=NULL;
 442     avi_priv_t* priv=calloc(1, sizeof(avi_priv_t));
 443
 444   demuxer->priv=(void*)priv;
 445
 446   //---- AVI header:
 447   read_avi_header(demuxer,(demuxer->stream->flags & MP_STREAM_SEEK_BW)?index_mode:-2);
 448
 449   if(demuxer->audio->id>=0 && !demuxer->a_streams[demuxer->audio->id]){
 450       mp_tmsg(MSGT_DEMUX,MSGL_WARN,"AVI: invalid audio stream ID: %d - ignoring (nosound)\n",demuxer->audio->id);
 451       demuxer->audio->id=-2; // disabled
 452   }
 453   if(demuxer->video->id>=0 && !demuxer->v_streams[demuxer->video->id]){
 454       mp_tmsg(MSGT_DEMUX,MSGL_WARN,"AVI: invalid video stream ID: %d - ignoring (using default)\n",demuxer->video->id);
 455       demuxer->video->id=-1; // autodetect
 456   }
 457
 458   stream_reset(demuxer->stream);
 459   stream_seek(demuxer->stream,demuxer->movi_start);
 460   if(priv->idx_size>1){
 461     // decide index format:
 462 #if 1
 463     if((AVI_IDX_OFFSET(&((AVIINDEXENTRY *)priv->idx)[0])<demuxer->movi_start ||
 464         AVI_IDX_OFFSET(&((AVIINDEXENTRY *)priv->idx)[1])<demuxer->movi_start )&& !priv->isodml)
 465       priv->idx_offset=demuxer->movi_start-4;
 466 #else
 467     if(AVI_IDX_OFFSET(&((AVIINDEXENTRY *)priv->idx)[0])<demuxer->movi_start)
 468       priv->idx_offset=demuxer->movi_start-4;
 469 #endif
 470     mp_msg(MSGT_DEMUX,MSGL_V,"AVI index offset: 0x%X (movi=0x%X idx0=0x%X idx1=0x%X)\n",
 471             (int)priv->idx_offset,(int)demuxer->movi_start,
 472             (int)((AVIINDEXENTRY *)priv->idx)[0].dwChunkOffset,
 473             (int)((AVIINDEXENTRY *)priv->idx)[1].dwChunkOffset);
 474   }
 475
 476   if(priv->idx_size>0){
 477       // check that file is non-interleaved:
 478       int i;
 479       off_t a_pos=-1;
 480       off_t v_pos=-1;
 481       for(i=0;i<priv->idx_size;i++){
 482         AVIINDEXENTRY* idx=&((AVIINDEXENTRY *)priv->idx)[i];
 483         demux_stream_t* ds=demux_avi_select_stream(demuxer,idx->ckid);
 484         off_t pos = priv->idx_offset + AVI_IDX_OFFSET(idx);
 485         if(a_pos==-1 && ds==demuxer->audio){
 486           a_pos=pos;
 487           if(v_pos!=-1) break;
 488         }
 489         if(v_pos==-1 && ds==demuxer->video){
 490           v_pos=pos;
 491           if(a_pos!=-1) break;
 492         }
 493       }
 494       if(v_pos==-1){
 495         mp_tmsg(MSGT_DEMUX,MSGL_ERR,"AVI_NI: " "No video stream found.\n");
 496         return NULL;
 497       }
 498       if(a_pos==-1){
 499         d_audio->sh=sh_audio=NULL;
 500       } else {
 501         if(force_ni || abs(a_pos-v_pos)>0x100000){  // distance > 1MB
 502           mp_tmsg(MSGT_DEMUX,MSGL_INFO,"%s NON-INTERLEAVED AVI file format.\n",force_ni?"Forced":"Detected");
 503           demuxer->type=DEMUXER_TYPE_AVI_NI; // HACK!!!!
 504           demuxer->desc=&demuxer_desc_avi_ni; // HACK!!!!
 505           pts_from_bps=1; // force BPS sync!
 506         }
 507       }
 508   } else {
 509       // no index
 510       if(force_ni){
 511           mp_tmsg(MSGT_DEMUX,MSGL_INFO,"Using NON-INTERLEAVED broken AVI file format.\n");
 512           demuxer->type=DEMUXER_TYPE_AVI_NINI; // HACK!!!!
 513           demuxer->desc=&demuxer_desc_avi_nini; // HACK!!!!
 514           priv->idx_pos_a=
 515           priv->idx_pos_v=demuxer->movi_start;
 516           pts_from_bps=1; // force BPS sync!
 517       }
 518       demuxer->seekable=0;
 519   }
 520   if(!ds_fill_buffer(d_video)){
 521     mp_tmsg(MSGT_DEMUX,MSGL_ERR,"AVI: " "Missing video stream!? Contact the author, it may be a bug :(\n");
 522     return NULL;
 523   }
 524   sh_video=d_video->sh;sh_video->ds=d_video;
 525   if(d_audio->id!=-2){
 526     mp_msg(MSGT_DEMUX,MSGL_V,"AVI: Searching for audio stream (id:%d)\n",d_audio->id);
 527     if(!priv->audio_streams || !ds_fill_buffer(d_audio)){
 528       mp_tmsg(MSGT_DEMUX,MSGL_INFO,"AVI: " "No audio stream found -> no sound.\n");
 529       d_audio->sh=sh_audio=NULL;
 530     } else {
 531       sh_audio=d_audio->sh;sh_audio->ds=d_audio;
 532     }
 533   }
 534
 535   // calculating audio/video bitrate:
 536   if(priv->idx_size>0){
 537     // we have index, let's count 'em!
 538     int64_t vsize=0;
 539     int64_t asize=0;
 540     size_t vsamples=0;
 541     size_t asamples=0;
 542     int i;
 543     for(i=0;i<priv->idx_size;i++){
 544       int id=avi_stream_id(((AVIINDEXENTRY *)priv->idx)[i].ckid);
 545       int len=((AVIINDEXENTRY *)priv->idx)[i].dwChunkLength;
 546       if(sh_video->ds->id == id) {
 547         vsize+=len;
 548         ++vsamples;
 549       }
 550       else if(sh_audio && sh_audio->ds->id == id) {
 551         asize+=len;
 552         asamples+=(len+priv->audio_block_size-1)/priv->audio_block_size;
 553       }
 554     }
 555     mp_msg(MSGT_DEMUX,MSGL_V,"AVI video size=%"PRId64" (%u) audio size=%"PRId64" (%u)\n",vsize,vsamples,asize,asamples);
 556     priv->numberofframes=vsamples;
 557     sh_video->i_bps=((float)vsize/(float)vsamples)*(float)sh_video->video.dwRate/(float)sh_video->video.dwScale;
 558     if(sh_audio) sh_audio->i_bps=((float)asize/(float)asamples)*(float)sh_audio->audio.dwRate/(float)sh_audio->audio.dwScale;
 559   } else {
 560     // guessing, results may be inaccurate:
 561     int64_t vsize;
 562     int64_t asize=0;
 563
 564     if((priv->numberofframes=sh_video->video.dwLength)<=1)
 565       // bad video header, try to get number of frames from audio
 566       if(sh_audio && sh_audio->wf->nAvgBytesPerSec) priv->numberofframes=sh_video->fps*sh_audio->audio.dwLength/sh_audio->audio.dwRate*sh_audio->audio.dwScale;
 567     if(priv->numberofframes<=1){
 568       mp_tmsg(MSGT_SEEK,MSGL_WARN,"Could not determine number of frames (for absolute seek).\n");
 569       priv->numberofframes=0;
 570     }
 571
 572     if(sh_audio){
 573       if(sh_audio->wf->nAvgBytesPerSec && sh_audio->audio.dwSampleSize!=1){
 574         asize=(float)sh_audio->wf->nAvgBytesPerSec*sh_audio->audio.dwLength*sh_audio->audio.dwScale/sh_audio->audio.dwRate;
 575       } else {
 576         asize=sh_audio->audio.dwLength;
 577         sh_audio->i_bps=(float)asize/(sh_video->frametime*priv->numberofframes);
 578       }
 579     }
 580     vsize=demuxer->movi_end-demuxer->movi_start-asize-8*priv->numberofframes;
 581     mp_msg(MSGT_DEMUX,MSGL_V,"AVI video size=%"PRId64" (%u)  audio size=%"PRId64"\n",vsize,priv->numberofframes,asize);
 582     sh_video->i_bps=(float)vsize/(sh_video->frametime*priv->numberofframes);
 583   }
 584
 585   return demuxer;
 586
 587 }
 588
 589
 590 static void demux_seek_avi(demuxer_t *demuxer,float rel_seek_secs,float audio_delay,int flags){
 591     avi_priv_t *priv=demuxer->priv;
 592     demux_stream_t *d_audio=demuxer->audio;
 593     demux_stream_t *d_video=demuxer->video;
 594     sh_audio_t *sh_audio=d_audio->sh;
 595     sh_video_t *sh_video=d_video->sh;
 596     float skip_audio_secs=0;
 597
 598   //FIXME: OFF_T - Didn't check AVI case yet (avi files can't be >2G anyway?)
 599   //================= seek in AVI ==========================
 600     int rel_seek_frames=rel_seek_secs*sh_video->fps;
 601     int video_chunk_pos=d_video->pos;
 602     int i;
 603
 604       if(flags&SEEK_ABSOLUTE){
 605         // seek absolute
 606         video_chunk_pos=0;
 607       }
 608
 609       if(flags&SEEK_FACTOR){
 610         rel_seek_frames=rel_seek_secs*priv->numberofframes;
 611       }
 612
 613       priv->skip_video_frames=0;
 614       priv->avi_audio_pts=0;
 615
 616 // ------------ STEP 1: find nearest video keyframe chunk ------------
 617       // find nearest video keyframe chunk pos:
 618       if(rel_seek_frames>0){
 619         // seek forward
 620         while(video_chunk_pos<priv->idx_size-1){
 621           int id=((AVIINDEXENTRY *)priv->idx)[video_chunk_pos].ckid;
 622           if(avi_stream_id(id)==d_video->id){  // video frame
 623             if((--rel_seek_frames)<0 && ((AVIINDEXENTRY *)priv->idx)[video_chunk_pos].dwFlags&AVIIF_KEYFRAME) break;
 624           }
 625           ++video_chunk_pos;
 626         }
 627       } else {
 628         // seek backward
 629         while(video_chunk_pos>0){
 630           int id=((AVIINDEXENTRY *)priv->idx)[video_chunk_pos].ckid;
 631           if(avi_stream_id(id)==d_video->id){  // video frame
 632             if((++rel_seek_frames)>0 && ((AVIINDEXENTRY *)priv->idx)[video_chunk_pos].dwFlags&AVIIF_KEYFRAME) break;
 633           }
 634           --video_chunk_pos;
 635         }
 636       }
 637       priv->idx_pos_a=priv->idx_pos_v=priv->idx_pos=video_chunk_pos;
 638
 639       // re-calc video pts:
 640       d_video->pack_no=0;
 641       for(i=0;i<video_chunk_pos;i++){
 642           int id=((AVIINDEXENTRY *)priv->idx)[i].ckid;
 643           if(avi_stream_id(id)==d_video->id) ++d_video->pack_no;
 644       }
 645       priv->video_pack_no=
 646       sh_video->num_frames=sh_video->num_frames_decoded=d_video->pack_no;
 647       priv->avi_video_pts=d_video->pack_no*(float)sh_video->video.dwScale/(float)sh_video->video.dwRate;
 648       d_video->pos=video_chunk_pos;
 649
 650       mp_msg(MSGT_SEEK,MSGL_DBG2,"V_SEEK:  pack=%d  pts=%5.3f  chunk=%d  \n",d_video->pack_no,priv->avi_video_pts,video_chunk_pos);
 651
 652 // ------------ STEP 2: seek audio, find the right chunk & pos ------------
 653
 654       d_audio->pack_no=0;
 655       priv->audio_block_no=0;
 656       d_audio->dpos=0;
 657
 658       if(sh_audio){
 659         int i;
 660         int len=0;
 661         int skip_audio_bytes=0;
 662         int curr_audio_pos=-1;
 663         int audio_chunk_pos=-1;
 664         int chunk_max=(demuxer->type==DEMUXER_TYPE_AVI)?video_chunk_pos:priv->idx_size;
 665
 666         if(sh_audio->audio.dwSampleSize){
 667             // constant rate audio stream
 668             /* immediate seeking to audio position, including when streams are delayed */
 669             curr_audio_pos=(priv->avi_video_pts + audio_delay)*(float)sh_audio->audio.dwRate/(float)sh_audio->audio.dwScale;
 670             curr_audio_pos*=sh_audio->audio.dwSampleSize;
 671
 672         // find audio chunk pos:
 673           for(i=0;i<chunk_max;i++){
 674             int id=((AVIINDEXENTRY *)priv->idx)[i].ckid;
 675             if(avi_stream_id(id)==d_audio->id){
 676                 len=((AVIINDEXENTRY *)priv->idx)[i].dwChunkLength;
 677                 if(d_audio->dpos<=curr_audio_pos && curr_audio_pos<(d_audio->dpos+len)){
 678                   break;
 679                 }
 680                 ++d_audio->pack_no;
 681                 priv->audio_block_no+=priv->audio_block_size ?
 682                     ((len+priv->audio_block_size-1)/priv->audio_block_size) : 1;
 683                 d_audio->dpos+=len;
 684             }
 685           }
 686           audio_chunk_pos=i;
 687           skip_audio_bytes=curr_audio_pos-d_audio->dpos;
 688
 689           mp_msg(MSGT_SEEK,MSGL_V,"SEEK: i=%d (max:%d) dpos=%d (wanted:%d)  \n",
 690               i,chunk_max,(int)d_audio->dpos,curr_audio_pos);
 691
 692         } else {
 693             // VBR audio
 694             /* immediate seeking to audio position, including when streams are delayed */
 695             int chunks=(priv->avi_video_pts + audio_delay)*(float)sh_audio->audio.dwRate/(float)sh_audio->audio.dwScale;
 696             audio_chunk_pos=0;
 697
 698         // find audio chunk pos:
 699           for(i=0;i<priv->idx_size && chunks>0;i++){
 700             int id=((AVIINDEXENTRY *)priv->idx)[i].ckid;
 701             if(avi_stream_id(id)==d_audio->id){
 702                 len=((AVIINDEXENTRY *)priv->idx)[i].dwChunkLength;
 703                 if(i>chunk_max){
 704                   skip_audio_bytes+=len;
 705                 } else {
 706                   ++d_audio->pack_no;
 707                   priv->audio_block_no+=priv->audio_block_size ?
 708                     ((len+priv->audio_block_size-1)/priv->audio_block_size) : 1;
 709                   d_audio->dpos+=len;
 710                   audio_chunk_pos=i;
 711                 }
 712                 if(priv->audio_block_size)
 713                     chunks-=(len+priv->audio_block_size-1)/priv->audio_block_size;
 714             }
 715           }
 716         }
 717
 718         // Now we have:
 719         //      audio_chunk_pos = chunk no in index table (it's <=chunk_max)
 720         //      skip_audio_bytes = bytes to be skipped after chunk seek
 721         //      d-audio->pack_no = chunk_no in stream at audio_chunk_pos
 722         //      d_audio->dpos = bytepos in stream at audio_chunk_pos
 723         // let's seek!
 724
 725           // update stream position:
 726           d_audio->pos=audio_chunk_pos;
 727
 728         if(demuxer->type==DEMUXER_TYPE_AVI){
 729           // interleaved stream:
 730           if(audio_chunk_pos<video_chunk_pos){
 731             // calc priv->skip_video_frames & adjust video pts counter:
 732             for(i=audio_chunk_pos;i<video_chunk_pos;i++){
 733               int id=((AVIINDEXENTRY *)priv->idx)[i].ckid;
 734               if(avi_stream_id(id)==d_video->id) ++priv->skip_video_frames;
 735             }
 736             // requires for correct audio pts calculation (demuxer):
 737             priv->avi_video_pts-=priv->skip_video_frames*(float)sh_video->video.dwScale/(float)sh_video->video.dwRate;
 738             priv->avi_audio_pts=priv->avi_video_pts;
 739             // set index position:
 740             priv->idx_pos_a=priv->idx_pos_v=priv->idx_pos=audio_chunk_pos;
 741           }
 742         } else {
 743             // non-interleaved stream:
 744             priv->idx_pos_a=audio_chunk_pos;
 745             priv->idx_pos_v=video_chunk_pos;
 746             priv->idx_pos=(audio_chunk_pos<video_chunk_pos)?audio_chunk_pos:video_chunk_pos;
 747         }
 748
 749           mp_msg(MSGT_SEEK,MSGL_V,"SEEK: idx=%d  (a:%d v:%d)  v.skip=%d  a.skip=%d/%4.3f  \n",
 750             (int)priv->idx_pos,audio_chunk_pos,video_chunk_pos,
 751             (int)priv->skip_video_frames,skip_audio_bytes,skip_audio_secs);
 752
 753           if(skip_audio_bytes){
 754             demux_read_data(d_audio,NULL,skip_audio_bytes);
 755           }
 756
 757       }
 758         d_video->pts=priv->avi_video_pts; // OSD
 759
 760 }
 761
 762
 763 static void demux_close_avi(demuxer_t *demuxer) {
 764   avi_priv_t* priv=demuxer->priv;
 765
 766   if(!priv)
 767     return;
 768
 769   if(priv->idx_size > 0)
 770     free(priv->idx);
 771   free(priv);
 772 }
 773
 774
 775 static int demux_avi_control(demuxer_t *demuxer,int cmd, void *arg){
 776     avi_priv_t *priv=demuxer->priv;
 777     demux_stream_t *d_video=demuxer->video;
 778     sh_video_t *sh_video=d_video->sh;
 779
 780     switch(cmd) {
 781         case DEMUXER_CTRL_GET_TIME_LENGTH:
 782             if (!priv->numberofframes || !sh_video) return DEMUXER_CTRL_DONTKNOW;
 783             *((double *)arg)=(double)priv->numberofframes/sh_video->fps;
 784             if (sh_video->video.dwLength<=1) return DEMUXER_CTRL_GUESS;
 785             return DEMUXER_CTRL_OK;
 786
 787         case DEMUXER_CTRL_GET_PERCENT_POS:
 788             if (!priv->numberofframes || !sh_video) {
 789               return DEMUXER_CTRL_DONTKNOW;
 790             }
 791             *((int *)arg)=(int)(priv->video_pack_no*100/priv->numberofframes);
 792             if (sh_video->video.dwLength<=1) return DEMUXER_CTRL_GUESS;
 793             return DEMUXER_CTRL_OK;
 794
 795         case DEMUXER_CTRL_SWITCH_AUDIO:
 796         case DEMUXER_CTRL_SWITCH_VIDEO: {
 797             int audio = (cmd == DEMUXER_CTRL_SWITCH_AUDIO);
 798             demux_stream_t *ds = audio ? demuxer->audio : demuxer->video;
 799             void **streams = audio ? demuxer->a_streams : demuxer->v_streams;
 800             int maxid = FFMIN(100, audio ? MAX_A_STREAMS : MAX_V_STREAMS);
 801             int chunkid;
 802             if (ds->id < -1)
 803               return DEMUXER_CTRL_NOTIMPL;
 804
 805             if (*(int *)arg >= 0)
 806               ds->id = *(int *)arg;
 807             else {
 808               int i;
 809               for (i = 0; i < maxid; i++) {
 810                 if (++ds->id >= maxid) ds->id = 0;
 811                 if (streams[ds->id]) break;
 812               }
 813             }
 814
 815             chunkid = (ds->id / 10 + '0') | (ds->id % 10 + '0') << 8;
 816             ds->sh = NULL;
 817             if (!streams[ds->id]) // stream not available
 818               ds->id = -1;
 819             else
 820               demux_avi_select_stream(demuxer, chunkid);
 821             *(int *)arg = ds->id;
 822             return DEMUXER_CTRL_OK;
 823         }
 824
 825         default:
 826             return DEMUXER_CTRL_NOTIMPL;
 827     }
 828 }
 829
 830
 831 static int avi_check_file(demuxer_t *demuxer)
 832 {
 833   int id=stream_read_dword_le(demuxer->stream); // "RIFF"
 834
 835   if((id==mmioFOURCC('R','I','F','F')) || (id==mmioFOURCC('O','N','2',' '))) {
 836     stream_read_dword_le(demuxer->stream); //filesize
 837     id=stream_read_dword_le(demuxer->stream); // "AVI "
 838     if(id==formtypeAVI)
 839       return DEMUXER_TYPE_AVI;
 840     // "Samsung Digimax i6 PMP" crap according to bug 742
 841     if(id==mmioFOURCC('A','V','I',0x19))
 842       return DEMUXER_TYPE_AVI;
 843     if(id==mmioFOURCC('O','N','2','f')){
 844       mp_tmsg(MSGT_DEMUXER,MSGL_INFO,"ON2 AVI format");
 845       return DEMUXER_TYPE_AVI;
 846     }
 847   }
 848
 849   return 0;
 850 }
 851
 852
 853 static demuxer_t* demux_open_hack_avi(demuxer_t *demuxer)
 854 {
 855    struct MPOpts *opts = demuxer->opts;
 856    sh_audio_t* sh_a;
 857
 858    demuxer = demux_open_avi(demuxer);
 859    if(!demuxer) return NULL; // failed to open
 860    sh_a = demuxer->audio->sh;
 861    if(demuxer->audio->id != -2 && sh_a) {
 862 #ifdef CONFIG_OGGVORBIS
 863     // support for Ogg-in-AVI:
 864     if(sh_a->format == 0xFFFE)
 865       demuxer = init_avi_with_ogg(demuxer);
 866     else if(sh_a->format == 0x674F) {
 867       stream_t* s;
 868       demuxer_t  *od;
 869       s = new_ds_stream(demuxer->audio);
 870       od = new_demuxer(opts, s,DEMUXER_TYPE_OGG,-1,-2,-2,NULL);
 871       if(!demux_ogg_open(od)) {
 872         mp_tmsg( MSGT_DEMUXER,MSGL_ERR,"Unable to open the Ogg demuxer.\n");
 873         free_stream(s);
 874         demuxer->audio->id = -2;
 875       } else
 876         demuxer = new_demuxers_demuxer(demuxer,od,demuxer);
 877    }
 878 #endif
 879    }
 880
 881    return demuxer;
 882 }
 883
 884
 885 const demuxer_desc_t demuxer_desc_avi = {
 886   "AVI demuxer",
 887   "avi",
 888   "AVI",
 889   "Arpi?",
 890   "AVI files, including non interleaved files",
 891   DEMUXER_TYPE_AVI,
 892   1, // safe autodetect
 893   avi_check_file,
 894   demux_avi_fill_buffer,
 895   demux_open_hack_avi,
 896   demux_close_avi,
 897   demux_seek_avi,
 898   demux_avi_control
 899 };
 900
 901 const demuxer_desc_t demuxer_desc_avi_ni = {
 902   "AVI demuxer, non-interleaved",
 903   "avini",
 904   "AVI",
 905   "Arpi?",
 906   "AVI files, including non interleaved files",
 907   DEMUXER_TYPE_AVI,
 908   1, // safe autodetect
 909   avi_check_file,
 910   demux_avi_fill_buffer_ni,
 911   demux_open_hack_avi,
 912   demux_close_avi,
 913   demux_seek_avi,
 914   demux_avi_control
 915 };
 916
 917 const demuxer_desc_t demuxer_desc_avi_nini = {
 918   "AVI demuxer, non-interleaved and no index",
 919   "avinini",
 920   "AVI",
 921   "Arpi?",
 922   "AVI files, including non interleaved files",
 923   DEMUXER_TYPE_AVI,
 924   1, // safe autodetect
 925   avi_check_file,
 926   demux_avi_fill_buffer_nini,
 927   demux_open_hack_avi,
 928   demux_close_avi,
 929   demux_seek_avi,
 930   demux_avi_control
 931 };