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
  29 #include "stream/stream.h"
  30 #include "demuxer.h"
  31 #include "stheader.h"
  32 #include "demux_ogg.h"
  33 #include "aviheader.h"
  34
  35 extern const demuxer_desc_t demuxer_desc_avi_ni;
  36 extern const demuxer_desc_t demuxer_desc_avi_nini;
  37
  38 // PTS:  0=interleaved  1=BPS-based
  39 int pts_from_bps=1;
  40
  41 // Select ds from ID
  42 static demux_stream_t *demux_avi_select_stream(demuxer_t *demux,
  43                                                unsigned int id)
  44 {
  45   int stream_id=avi_stream_id(id);
  46
  47
  48   if(demux->video->id==-1)
  49     if(demux->v_streams[stream_id])
  50         demux->video->id=stream_id;
  51
  52   if(demux->audio->id==-1)
  53     if(demux->a_streams[stream_id])
  54         demux->audio->id=stream_id;
  55
  56   if(stream_id==demux->audio->id){
  57       if(!demux->audio->sh){
  58         sh_audio_t* sh;
  59         avi_priv_t *priv=demux->priv;
  60         sh=demux->audio->sh=demux->a_streams[stream_id];
  61         mp_msg(MSGT_DEMUX,MSGL_V,"Auto-selected AVI audio ID = %d\n",demux->audio->id);
  62         if(sh->wf){
  63           priv->audio_block_size=sh->wf->nBlockAlign;
  64           if(!priv->audio_block_size){
  65             // for PCM audio we can calculate the blocksize:
  66             if(sh->format==1)
  67                 priv->audio_block_size=sh->wf->nChannels*(sh->wf->wBitsPerSample/8);
  68             else
  69                 priv->audio_block_size=1; // hope the best...
  70           } else {
  71             // workaround old mencoder's bug:
  72             if(sh->audio.dwSampleSize==1 && sh->audio.dwScale==1 &&
  73                (sh->wf->nBlockAlign==1152 || sh->wf->nBlockAlign==576)){
  74                 mp_tmsg(MSGT_DEMUX,MSGL_WARN,"AVI: Working around CBR-MP3 nBlockAlign header bug!\n");
  75                 priv->audio_block_size=1;
  76             }
  77           }
  78         } else {
  79           priv->audio_block_size=sh->audio.dwSampleSize;
  80         }
  81       }
  82       return demux->audio;
  83   }
  84   if(stream_id==demux->video->id){
  85       if(!demux->video->sh){
  86         demux->video->sh=demux->v_streams[stream_id];
  87         mp_msg(MSGT_DEMUX,MSGL_V,"Auto-selected AVI video ID = %d\n",demux->video->id);
  88       }
  89       return demux->video;
  90   }
  91   if(id!=mmioFOURCC('J','U','N','K')){
  92      // unknown
  93      mp_msg(MSGT_DEMUX,MSGL_DBG2,"Unknown chunk: %.4s (%X)\n",(char *) &id,id);
  94      //abort();
  95   }
  96   return NULL;
  97 }
  98
  99 static int valid_fourcc(unsigned int id){
 100     static const char valid[] = "0123456789abcdefghijklmnopqrstuvwxyz"
 101                                 "ABCDEFGHIJKLMNOPQRSTUVWXYZ_";
 102     unsigned char* fcc=(unsigned char*)(&id);
 103     return strchr(valid, fcc[0]) && strchr(valid, fcc[1]) &&
 104            strchr(valid, fcc[2]) && strchr(valid, fcc[3]);
 105 }
 106
 107 static int valid_stream_id(unsigned int id) {
 108     unsigned char* fcc=(unsigned char*)(&id);
 109     return fcc[0] >= '0' && fcc[0] <= '9' && fcc[1] >= '0' && fcc[1] <= '9' &&
 110            ((fcc[2] == 'w' && fcc[3] == 'b') || (fcc[2] == 'd' && fcc[3] == 'c'));
 111 }
 112
 113 static int choose_chunk_len(unsigned int len1,unsigned int len2){
 114     // len1 has a bit more priority than len2. len1!=len2
 115     // Note: this is a first-idea-logic, may be wrong. comments welcomed.
 116
 117     // prefer small frames rather than 0
 118     if(!len1) return (len2>0x80000) ? len1 : len2;
 119     if(!len2) return (len1>0x100000) ? len2 : len1;
 120
 121     // choose the smaller value:
 122     return (len1<len2)? len1 : len2;
 123 }
 124
 125 static int demux_avi_read_packet(demuxer_t *demux,demux_stream_t *ds,unsigned int id,unsigned int len,int idxpos,int flags){
 126   avi_priv_t *priv=demux->priv;
 127   int skip;
 128   float pts=0;
 129
 130   mp_dbg(MSGT_DEMUX,MSGL_DBG3,"demux_avi.read_packet: %X\n",id);
 131
 132   if(ds==demux->audio){
 133       if(priv->pts_corrected==0){
 134           if(priv->pts_has_video){
 135               // we have video pts now
 136               float delay=0;
 137               if(((sh_audio_t*)(ds->sh))->wf->nAvgBytesPerSec)
 138                   delay=(float)priv->pts_corr_bytes/((sh_audio_t*)(ds->sh))->wf->nAvgBytesPerSec;
 139               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);
 140               //priv->pts_correction=-priv->avi_audio_pts+delay;
 141               priv->pts_correction=delay-priv->avi_audio_pts;
 142               priv->avi_audio_pts+=priv->pts_correction;
 143               priv->pts_corrected=1;
 144           } else
 145               priv->pts_corr_bytes+=len;
 146       }
 147       if(pts_from_bps){
 148           pts = priv->audio_block_no *
 149             (float)((sh_audio_t*)demux->audio->sh)->audio.dwScale /
 150             (float)((sh_audio_t*)demux->audio->sh)->audio.dwRate;
 151       } else
 152           pts=priv->avi_audio_pts; //+priv->pts_correction;
 153       priv->avi_audio_pts=0;
 154       // update blockcount:
 155       priv->audio_block_no+=priv->audio_block_size ?
 156         ((len+priv->audio_block_size-1)/priv->audio_block_size) : 1;
 157   } else
 158   if(ds==demux->video){
 159      // video
 160      if(priv->skip_video_frames>0){
 161        // drop frame (seeking)
 162        --priv->skip_video_frames;
 163        ds=NULL;
 164      }
 165
 166      pts = priv->avi_video_pts = priv->video_pack_no *
 167          (float)((sh_video_t*)demux->video->sh)->video.dwScale /
 168          (float)((sh_video_t*)demux->video->sh)->video.dwRate;
 169
 170      priv->avi_audio_pts=priv->avi_video_pts+priv->pts_correction;
 171      priv->pts_has_video=1;
 172
 173      if(ds) ++priv->video_pack_no;
 174
 175   }
 176
 177   skip=(len+1)&(~1); // total bytes in this chunk
 178
 179   if(ds){
 180     mp_dbg(MSGT_DEMUX,MSGL_DBG2,"DEMUX_AVI: Read %d data bytes from packet %04X\n",len,id);
 181     ds_read_packet(ds,demux->stream,len,pts,idxpos,flags);
 182     skip-=len;
 183   }
 184   skip = FFMAX(skip, 0);
 185   if (avi_stream_id(id) > 99 && id != mmioFOURCC('J','U','N','K'))
 186     skip = FFMIN(skip, 65536);
 187   if(skip){
 188     mp_dbg(MSGT_DEMUX,MSGL_DBG2,"DEMUX_AVI: Skipping %d bytes from packet %04X\n",skip,id);
 189     stream_skip(demux->stream,skip);
 190   }
 191   return ds?1:0;
 192 }
 193
 194 static uint32_t avi_find_id(stream_t *stream) {
 195   uint32_t id = stream_read_dword_le(stream);
 196   if (!id) {
 197     mp_msg(MSGT_DEMUX, MSGL_WARN, "Incomplete stream? Trying resync.\n");
 198     do {
 199       id = stream_read_dword_le(stream);
 200       if (stream_eof(stream)) return 0;
 201     } while (avi_stream_id(id) > 99);
 202   }
 203   return id;
 204 }
 205
 206 // return value:
 207 //     0 = EOF or no stream found
 208 //     1 = successfully read a packet
 209 static int demux_avi_fill_buffer(demuxer_t *demux, demux_stream_t *dsds){
 210 avi_priv_t *priv=demux->priv;
 211 unsigned int id=0;
 212 unsigned int len;
 213 int ret=0;
 214 demux_stream_t *ds;
 215
 216 do{
 217   int flags=1;
 218   AVIINDEXENTRY *idx=NULL;
 219   if(priv->idx_size>0 && priv->idx_pos<priv->idx_size){
 220     off_t pos;
 221
 222     idx=&((AVIINDEXENTRY *)priv->idx)[priv->idx_pos++];
 223
 224     if(idx->dwFlags&AVIIF_LIST){
 225       if (!valid_stream_id(idx->ckid))
 226       // LIST
 227       continue;
 228       if (!priv->warned_unaligned)
 229         mp_msg(MSGT_DEMUX, MSGL_WARN, "Looks like unaligned chunk in index, broken AVI file!\n");
 230       priv->warned_unaligned = 1;
 231     }
 232     if(!demux_avi_select_stream(demux,idx->ckid)){
 233       mp_dbg(MSGT_DEMUX,MSGL_DBG3,"Skip chunk %.4s (0x%X)  \n",(char *)&idx->ckid,(unsigned int)idx->ckid);
 234       continue; // skip this chunk
 235     }
 236
 237     pos = (off_t)priv->idx_offset+AVI_IDX_OFFSET(idx);
 238     if((pos<demux->movi_start || pos>=demux->movi_end) && (demux->movi_end>demux->movi_start) && (demux->stream->flags & MP_STREAM_SEEK)){
 239       mp_msg(MSGT_DEMUX,MSGL_V,"ChunkOffset out of range!   idx=0x%"PRIX64"  \n",(int64_t)pos);
 240       continue;
 241     }
 242     stream_seek(demux->stream,pos);
 243     demux->filepos=stream_tell(demux->stream);
 244     id=stream_read_dword_le(demux->stream);
 245     if(stream_eof(demux->stream)) return 0; // EOF!
 246
 247     if(id!=idx->ckid){
 248       mp_msg(MSGT_DEMUX,MSGL_V,"ChunkID mismatch! raw=%.4s idx=%.4s  \n",(char *)&id,(char *)&idx->ckid);
 249       if(valid_fourcc(idx->ckid))
 250           id=idx->ckid; // use index if valid
 251       else
 252           if(!valid_fourcc(id)) continue; // drop chunk if both id and idx bad
 253     }
 254     len=stream_read_dword_le(demux->stream);
 255     if((len!=idx->dwChunkLength)&&((len+1)!=idx->dwChunkLength)){
 256       mp_msg(MSGT_DEMUX,MSGL_V,"ChunkSize mismatch! raw=%d idx=%d  \n",len,idx->dwChunkLength);
 257       if(len>0x200000 && idx->dwChunkLength>0x200000) continue; // both values bad :(
 258       len=choose_chunk_len(idx->dwChunkLength,len);
 259     }
 260     if(!(idx->dwFlags&AVIIF_KEYFRAME)) flags=0;
 261   } else {
 262     demux->filepos=stream_tell(demux->stream);
 263     if(demux->filepos>=demux->movi_end && demux->movi_end>demux->movi_start && (demux->stream->flags & MP_STREAM_SEEK)){
 264           demux->stream->eof=1;
 265           return 0;
 266     }
 267     id=avi_find_id(demux->stream);
 268     len=stream_read_dword_le(demux->stream);
 269     if(stream_eof(demux->stream)) return 0; // EOF!
 270
 271     if(id==mmioFOURCC('L','I','S','T') || id==mmioFOURCC('R', 'I', 'F', 'F')){
 272       id=stream_read_dword_le(demux->stream); // list or RIFF type
 273       continue;
 274     }
 275   }
 276
 277   ds=demux_avi_select_stream(demux,id);
 278   if(ds)
 279     if(ds->packs+1>=MAX_PACKS || ds->bytes+len>=MAX_PACK_BYTES){
 280         // this packet will cause a buffer overflow, switch to -ni mode!!!
 281         mp_tmsg(MSGT_DEMUX,MSGL_WARN,"\nBadly interleaved AVI file detected - switching to -ni mode...\n");
 282         if(priv->idx_size>0){
 283             // has index
 284             demux->type=DEMUXER_TYPE_AVI_NI;
 285             demux->desc=&demuxer_desc_avi_ni;
 286             --priv->idx_pos; // hack
 287         } else {
 288             // no index
 289             demux->type=DEMUXER_TYPE_AVI_NINI;
 290             demux->desc=&demuxer_desc_avi_nini;
 291             priv->idx_pos=demux->filepos; // hack
 292         }
 293         priv->idx_pos_v=priv->idx_pos_a=priv->idx_pos;
 294         // quit now, we can't even (no enough buffer memory) read this packet :(
 295         return -1;
 296     }
 297
 298   ret=demux_avi_read_packet(demux,ds,id,len,priv->idx_pos-1,flags);
 299 } while(ret!=1);
 300   return 1;
 301 }
 302
 303
 304 // return value:
 305 //     0 = EOF or no stream found
 306 //     1 = successfully read a packet
 307 static int demux_avi_fill_buffer_ni(demuxer_t *demux, demux_stream_t *ds)
 308 {
 309 avi_priv_t *priv=demux->priv;
 310 unsigned int id=0;
 311 unsigned int len;
 312 int ret=0;
 313
 314 do{
 315   int flags=1;
 316   AVIINDEXENTRY *idx=NULL;
 317   int idx_pos=0;
 318   demux->filepos=stream_tell(demux->stream);
 319
 320   if(ds==demux->video) idx_pos=priv->idx_pos_v++; else
 321   if(ds==demux->audio) idx_pos=priv->idx_pos_a++; else
 322                        idx_pos=priv->idx_pos++;
 323
 324   if(priv->idx_size>0 && idx_pos<priv->idx_size){
 325     off_t pos;
 326     idx=&((AVIINDEXENTRY *)priv->idx)[idx_pos];
 327
 328     if(idx->dwFlags&AVIIF_LIST){
 329       if (!valid_stream_id(idx->ckid))
 330       // LIST
 331       continue;
 332       if (!priv->warned_unaligned)
 333         mp_msg(MSGT_DEMUX, MSGL_WARN, "Looks like unaligned chunk in index, broken AVI file!\n");
 334       priv->warned_unaligned = 1;
 335     }
 336     if(ds && demux_avi_select_stream(demux,idx->ckid)!=ds){
 337       mp_dbg(MSGT_DEMUX,MSGL_DBG3,"Skip chunk %.4s (0x%X)  \n",(char *)&idx->ckid,(unsigned int)idx->ckid);
 338       continue; // skip this chunk
 339     }
 340
 341     pos = priv->idx_offset+AVI_IDX_OFFSET(idx);
 342     if((pos<demux->movi_start || pos>=demux->movi_end) && (demux->movi_end>demux->movi_start)){
 343       mp_msg(MSGT_DEMUX,MSGL_V,"ChunkOffset out of range!  current=0x%"PRIX64"  idx=0x%"PRIX64"  \n",(int64_t)demux->filepos,(int64_t)pos);
 344       continue;
 345     }
 346     stream_seek(demux->stream,pos);
 347
 348     id=stream_read_dword_le(demux->stream);
 349
 350     if(stream_eof(demux->stream)) return 0;
 351
 352     if(id!=idx->ckid){
 353       mp_msg(MSGT_DEMUX,MSGL_V,"ChunkID mismatch! raw=%.4s idx=%.4s  \n",(char *)&id,(char *)&idx->ckid);
 354       if(valid_fourcc(idx->ckid))
 355           id=idx->ckid; // use index if valid
 356       else
 357           if(!valid_fourcc(id)) continue; // drop chunk if both id and idx bad
 358     }
 359     len=stream_read_dword_le(demux->stream);
 360     if((len!=idx->dwChunkLength)&&((len+1)!=idx->dwChunkLength)){
 361       mp_msg(MSGT_DEMUX,MSGL_V,"ChunkSize mismatch! raw=%d idx=%d  \n",len,idx->dwChunkLength);
 362       if(len>0x200000 && idx->dwChunkLength>0x200000) continue; // both values bad :(
 363       len=choose_chunk_len(idx->dwChunkLength,len);
 364     }
 365     if(!(idx->dwFlags&AVIIF_KEYFRAME)) flags=0;
 366   } else return 0;
 367   ret=demux_avi_read_packet(demux,demux_avi_select_stream(demux,id),id,len,idx_pos,flags);
 368 } while(ret!=1);
 369   return 1;
 370 }
 371
 372
 373 // return value:
 374 //     0 = EOF or no stream found
 375 //     1 = successfully read a packet
 376 static int demux_avi_fill_buffer_nini(demuxer_t *demux, demux_stream_t *ds)
 377 {
 378 avi_priv_t *priv=demux->priv;
 379 unsigned int id=0;
 380 unsigned int len;
 381 int ret=0;
 382 off_t *fpos=NULL;
 383
 384   if(ds==demux->video) fpos=&priv->idx_pos_v; else
 385   if(ds==demux->audio) fpos=&priv->idx_pos_a; else
 386   return 0;
 387
 388   stream_seek(demux->stream,fpos[0]);
 389
 390 do{
 391
 392   demux->filepos=stream_tell(demux->stream);
 393   if(demux->filepos>=demux->movi_end && (demux->movi_end>demux->movi_start)){
 394           ds->eof=1;
 395           return 0;
 396   }
 397
 398   id=avi_find_id(demux->stream);
 399   len=stream_read_dword_le(demux->stream);
 400
 401   if(stream_eof(demux->stream)) return 0;
 402
 403   if(id==mmioFOURCC('L','I','S','T')){
 404       id=stream_read_dword_le(demux->stream);      // list type
 405       continue;
 406   }
 407
 408   if(id==mmioFOURCC('R','I','F','F')){
 409       mp_msg(MSGT_DEMUX,MSGL_V,"additional RIFF header...\n");
 410       id=stream_read_dword_le(demux->stream);      // "AVIX"
 411       continue;
 412   }
 413
 414   if(ds==demux_avi_select_stream(demux,id)){
 415     // read it!
 416     ret=demux_avi_read_packet(demux,ds,id,len,priv->idx_pos-1,0);
 417   } else {
 418     // skip it!
 419     int skip=(len+1)&(~1); // total bytes in this chunk
 420     stream_skip(demux->stream,skip);
 421   }
 422
 423 } while(ret!=1);
 424   fpos[0]=stream_tell(demux->stream);
 425   return 1;
 426 }
 427
 428 // AVI demuxer parameters:
 429 int index_mode=-1;  // -1=untouched  0=don't use index  1=use (generate) index
 430 char *index_file_save = NULL, *index_file_load = NULL;
 431 int force_ni=0;     // force non-interleaved AVI parsing
 432
 433 static demuxer_t* demux_open_avi(demuxer_t* demuxer){
 434     demux_stream_t *d_audio=demuxer->audio;
 435     demux_stream_t *d_video=demuxer->video;
 436     sh_audio_t *sh_audio=NULL;
 437     sh_video_t *sh_video=NULL;
 438     avi_priv_t* priv=calloc(1, sizeof(avi_priv_t));
 439
 440   demuxer->priv=(void*)priv;
 441
 442   //---- AVI header:
 443   read_avi_header(demuxer,(demuxer->stream->flags & MP_STREAM_SEEK_BW)?index_mode:-2);
 444
 445   if(demuxer->audio->id>=0 && !demuxer->a_streams[demuxer->audio->id]){
 446       mp_tmsg(MSGT_DEMUX,MSGL_WARN,"AVI: invalid audio stream ID: %d - ignoring (nosound)\n",demuxer->audio->id);
 447       demuxer->audio->id=-2; // disabled
 448   }
 449   if(demuxer->video->id>=0 && !demuxer->v_streams[demuxer->video->id]){
 450       mp_tmsg(MSGT_DEMUX,MSGL_WARN,"AVI: invalid video stream ID: %d - ignoring (using default)\n",demuxer->video->id);
 451       demuxer->video->id=-1; // autodetect
 452   }
 453
 454   stream_reset(demuxer->stream);
 455   stream_seek(demuxer->stream,demuxer->movi_start);
 456   if(priv->idx_size>1){
 457     // decide index format:
 458 #if 1
 459     if((AVI_IDX_OFFSET(&((AVIINDEXENTRY *)priv->idx)[0])<demuxer->movi_start ||
 460         AVI_IDX_OFFSET(&((AVIINDEXENTRY *)priv->idx)[1])<demuxer->movi_start )&& !priv->isodml)
 461       priv->idx_offset=demuxer->movi_start-4;
 462 #else
 463     if(AVI_IDX_OFFSET(&((AVIINDEXENTRY *)priv->idx)[0])<demuxer->movi_start)
 464       priv->idx_offset=demuxer->movi_start-4;
 465 #endif
 466     mp_msg(MSGT_DEMUX,MSGL_V,"AVI index offset: 0x%X (movi=0x%X idx0=0x%X idx1=0x%X)\n",
 467             (int)priv->idx_offset,(int)demuxer->movi_start,
 468             (int)((AVIINDEXENTRY *)priv->idx)[0].dwChunkOffset,
 469             (int)((AVIINDEXENTRY *)priv->idx)[1].dwChunkOffset);
 470   }
 471
 472   if(priv->idx_size>0){
 473       // check that file is non-interleaved:
 474       int i;
 475       off_t a_pos=-1;
 476       off_t v_pos=-1;
 477       for(i=0;i<priv->idx_size;i++){
 478         AVIINDEXENTRY* idx=&((AVIINDEXENTRY *)priv->idx)[i];
 479         demux_stream_t* ds=demux_avi_select_stream(demuxer,idx->ckid);
 480         off_t pos = priv->idx_offset + AVI_IDX_OFFSET(idx);
 481         if(a_pos==-1 && ds==demuxer->audio){
 482           a_pos=pos;
 483           if(v_pos!=-1) break;
 484         }
 485         if(v_pos==-1 && ds==demuxer->video){
 486           v_pos=pos;
 487           if(a_pos!=-1) break;
 488         }
 489       }
 490       if(v_pos==-1){
 491           mp_msg(MSGT_DEMUX, MSGL_ERR, "AVI_NI: %s",
 492                  mp_gtext("No video stream found.\n"));
 493         return NULL;
 494       }
 495       if(a_pos==-1){
 496         d_audio->sh=sh_audio=NULL;
 497       } else {
 498         if(force_ni || abs(a_pos-v_pos)>0x100000){  // distance > 1MB
 499           mp_tmsg(MSGT_DEMUX,MSGL_INFO,"%s NON-INTERLEAVED AVI file format.\n",force_ni?"Forced":"Detected");
 500           demuxer->type=DEMUXER_TYPE_AVI_NI; // HACK!!!!
 501           demuxer->desc=&demuxer_desc_avi_ni; // HACK!!!!
 502           pts_from_bps=1; // force BPS sync!
 503         }
 504       }
 505   } else {
 506       // no index
 507       if(force_ni){
 508           mp_tmsg(MSGT_DEMUX,MSGL_INFO,"Using NON-INTERLEAVED broken AVI file format.\n");
 509           demuxer->type=DEMUXER_TYPE_AVI_NINI; // HACK!!!!
 510           demuxer->desc=&demuxer_desc_avi_nini; // HACK!!!!
 511           priv->idx_pos_a=
 512           priv->idx_pos_v=demuxer->movi_start;
 513           pts_from_bps=1; // force BPS sync!
 514       }
 515       demuxer->seekable=0;
 516   }
 517   if(!ds_fill_buffer(d_video)){
 518       mp_msg(MSGT_DEMUX, MSGL_ERR, "AVI: %s",
 519              mp_gtext("Missing video stream!? Contact the author, "
 520                       "it may be a bug :(\n"));
 521     return NULL;
 522   }
 523   sh_video=d_video->sh;sh_video->ds=d_video;
 524   if(d_audio->id!=-2){
 525     mp_msg(MSGT_DEMUX,MSGL_V,"AVI: Searching for audio stream (id:%d)\n",d_audio->id);
 526     if(!priv->audio_streams || !ds_fill_buffer(d_audio)){
 527         mp_msg(MSGT_DEMUX, MSGL_INFO, "AVI: %s",
 528                mp_gtext("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     AVIINDEXENTRY *idx = priv->idx;
 539     int64_t vsize=0;
 540     int64_t asize=0;
 541     size_t vsamples=0;
 542     size_t asamples=0;
 543     int i;
 544     for(i=0;i<priv->idx_size;i++){
 545       int id=avi_stream_id(idx[i].ckid);
 546       unsigned len=idx[i].dwChunkLength;
 547       if(sh_video->ds->id == id) {
 548         vsize+=len;
 549         ++vsamples;
 550       }
 551       else if(sh_audio && sh_audio->ds->id == id) {
 552         asize+=len;
 553         asamples+=(len+priv->audio_block_size-1)/priv->audio_block_size;
 554       }
 555     }
 556     mp_msg(MSGT_DEMUX,MSGL_V,"AVI video size=%"PRId64" (%u) audio size=%"PRId64" (%u)\n",vsize,vsamples,asize,asamples);
 557     priv->numberofframes=vsamples;
 558     sh_video->i_bps=((float)vsize/(float)vsamples)*(float)sh_video->video.dwRate/(float)sh_video->video.dwScale;
 559     if(sh_audio) sh_audio->i_bps=((float)asize/(float)asamples)*(float)sh_audio->audio.dwRate/(float)sh_audio->audio.dwScale;
 560   } else {
 561     // guessing, results may be inaccurate:
 562     int64_t vsize;
 563     int64_t asize=0;
 564
 565     if((priv->numberofframes=sh_video->video.dwLength)<=1)
 566       // bad video header, try to get number of frames from audio
 567       if(sh_audio && sh_audio->wf->nAvgBytesPerSec) priv->numberofframes=sh_video->fps*sh_audio->audio.dwLength/sh_audio->audio.dwRate*sh_audio->audio.dwScale;
 568     if(priv->numberofframes<=1){
 569       mp_tmsg(MSGT_SEEK,MSGL_WARN,"Could not determine number of frames (for absolute seek).\n");
 570       priv->numberofframes=0;
 571     }
 572
 573     if(sh_audio){
 574       if(sh_audio->wf->nAvgBytesPerSec && sh_audio->audio.dwSampleSize!=1){
 575         asize=(float)sh_audio->wf->nAvgBytesPerSec*sh_audio->audio.dwLength*sh_audio->audio.dwScale/sh_audio->audio.dwRate;
 576       } else {
 577         asize=sh_audio->audio.dwLength;
 578         sh_audio->i_bps=(float)asize/(sh_video->frametime*priv->numberofframes);
 579       }
 580     }
 581     vsize=demuxer->movi_end-demuxer->movi_start-asize-8*priv->numberofframes;
 582     mp_msg(MSGT_DEMUX,MSGL_V,"AVI video size=%"PRId64" (%u)  audio size=%"PRId64"\n",vsize,priv->numberofframes,asize);
 583     sh_video->i_bps=(float)vsize/(sh_video->frametime*priv->numberofframes);
 584   }
 585
 586   return demuxer;
 587
 588 }
 589
 590
 591 static void demux_seek_avi(demuxer_t *demuxer, float rel_seek_secs,
 592                            float audio_delay, int flags)
 593 {
 594     avi_priv_t *priv=demuxer->priv;
 595     demux_stream_t *d_audio=demuxer->audio;
 596     demux_stream_t *d_video=demuxer->video;
 597     sh_audio_t *sh_audio=d_audio->sh;
 598     sh_video_t *sh_video=d_video->sh;
 599     float skip_audio_secs=0;
 600
 601   //FIXME: OFF_T - Didn't check AVI case yet (avi files can't be >2G anyway?)
 602   //================= seek in AVI ==========================
 603     int rel_seek_frames=rel_seek_secs*sh_video->fps;
 604     int video_chunk_pos=d_video->pos;
 605     int i;
 606
 607       if(flags&SEEK_ABSOLUTE){
 608         // seek absolute
 609         video_chunk_pos=0;
 610       }
 611
 612       if(flags&SEEK_FACTOR){
 613         rel_seek_frames=rel_seek_secs*priv->numberofframes;
 614       }
 615
 616       priv->skip_video_frames=0;
 617       priv->avi_audio_pts=0;
 618
 619 // ------------ STEP 1: find nearest video keyframe chunk ------------
 620       // find nearest video keyframe chunk pos:
 621       if(rel_seek_frames>0){
 622         // seek forward
 623         while(video_chunk_pos<priv->idx_size-1){
 624           int id=((AVIINDEXENTRY *)priv->idx)[video_chunk_pos].ckid;
 625           if(avi_stream_id(id)==d_video->id){  // video frame
 626             if((--rel_seek_frames)<0 && ((AVIINDEXENTRY *)priv->idx)[video_chunk_pos].dwFlags&AVIIF_KEYFRAME) break;
 627           }
 628           ++video_chunk_pos;
 629         }
 630       } else {
 631         // seek backward
 632         while(video_chunk_pos>0){
 633           int id=((AVIINDEXENTRY *)priv->idx)[video_chunk_pos].ckid;
 634           if(avi_stream_id(id)==d_video->id){  // video frame
 635             if((++rel_seek_frames)>0 && ((AVIINDEXENTRY *)priv->idx)[video_chunk_pos].dwFlags&AVIIF_KEYFRAME) break;
 636           }
 637           --video_chunk_pos;
 638         }
 639       }
 640       priv->idx_pos_a=priv->idx_pos_v=priv->idx_pos=video_chunk_pos;
 641
 642       // re-calc video pts:
 643       d_video->pack_no=0;
 644       for(i=0;i<video_chunk_pos;i++){
 645           int id=((AVIINDEXENTRY *)priv->idx)[i].ckid;
 646           if(avi_stream_id(id)==d_video->id) ++d_video->pack_no;
 647       }
 648       priv->video_pack_no=
 649       sh_video->num_frames=sh_video->num_frames_decoded=d_video->pack_no;
 650       priv->avi_video_pts=d_video->pack_no*(float)sh_video->video.dwScale/(float)sh_video->video.dwRate;
 651       d_video->pos=video_chunk_pos;
 652
 653       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);
 654
 655 // ------------ STEP 2: seek audio, find the right chunk & pos ------------
 656
 657       d_audio->pack_no=0;
 658       priv->audio_block_no=0;
 659       d_audio->dpos=0;
 660
 661       if(sh_audio){
 662         int i;
 663         int len=0;
 664         int skip_audio_bytes=0;
 665         int curr_audio_pos=-1;
 666         int audio_chunk_pos=-1;
 667         int chunk_max=(demuxer->type==DEMUXER_TYPE_AVI)?video_chunk_pos:priv->idx_size;
 668
 669         if(sh_audio->audio.dwSampleSize){
 670             // constant rate audio stream
 671             /* immediate seeking to audio position, including when streams are delayed */
 672             curr_audio_pos=(priv->avi_video_pts + audio_delay)*(float)sh_audio->audio.dwRate/(float)sh_audio->audio.dwScale;
 673             curr_audio_pos*=sh_audio->audio.dwSampleSize;
 674
 675         // find audio chunk pos:
 676           for(i=0;i<chunk_max;i++){
 677             int id=((AVIINDEXENTRY *)priv->idx)[i].ckid;
 678             if(avi_stream_id(id)==d_audio->id){
 679                 len=((AVIINDEXENTRY *)priv->idx)[i].dwChunkLength;
 680                 if(d_audio->dpos<=curr_audio_pos && curr_audio_pos<(d_audio->dpos+len)){
 681                   break;
 682                 }
 683                 ++d_audio->pack_no;
 684                 priv->audio_block_no+=priv->audio_block_size ?
 685                     ((len+priv->audio_block_size-1)/priv->audio_block_size) : 1;
 686                 d_audio->dpos+=len;
 687             }
 688           }
 689           audio_chunk_pos=i;
 690           skip_audio_bytes=curr_audio_pos-d_audio->dpos;
 691
 692           mp_msg(MSGT_SEEK,MSGL_V,"SEEK: i=%d (max:%d) dpos=%d (wanted:%d)  \n",
 693               i,chunk_max,(int)d_audio->dpos,curr_audio_pos);
 694
 695         } else {
 696             // VBR audio
 697             /* immediate seeking to audio position, including when streams are delayed */
 698             int chunks=(priv->avi_video_pts + audio_delay)*(float)sh_audio->audio.dwRate/(float)sh_audio->audio.dwScale;
 699             audio_chunk_pos=0;
 700
 701         // find audio chunk pos:
 702           for(i=0;i<priv->idx_size && chunks>0;i++){
 703             int id=((AVIINDEXENTRY *)priv->idx)[i].ckid;
 704             if(avi_stream_id(id)==d_audio->id){
 705                 len=((AVIINDEXENTRY *)priv->idx)[i].dwChunkLength;
 706                 if(i>chunk_max){
 707                   skip_audio_bytes+=len;
 708                 } else {
 709                   ++d_audio->pack_no;
 710                   priv->audio_block_no+=priv->audio_block_size ?
 711                     ((len+priv->audio_block_size-1)/priv->audio_block_size) : 1;
 712                   d_audio->dpos+=len;
 713                   audio_chunk_pos=i;
 714                 }
 715                 if(priv->audio_block_size)
 716                     chunks-=(len+priv->audio_block_size-1)/priv->audio_block_size;
 717             }
 718           }
 719         }
 720
 721         // Now we have:
 722         //      audio_chunk_pos = chunk no in index table (it's <=chunk_max)
 723         //      skip_audio_bytes = bytes to be skipped after chunk seek
 724         //      d-audio->pack_no = chunk_no in stream at audio_chunk_pos
 725         //      d_audio->dpos = bytepos in stream at audio_chunk_pos
 726         // let's seek!
 727
 728           // update stream position:
 729           d_audio->pos=audio_chunk_pos;
 730
 731         if(demuxer->type==DEMUXER_TYPE_AVI){
 732           // interleaved stream:
 733           if(audio_chunk_pos<video_chunk_pos){
 734             // calc priv->skip_video_frames & adjust video pts counter:
 735             for(i=audio_chunk_pos;i<video_chunk_pos;i++){
 736               int id=((AVIINDEXENTRY *)priv->idx)[i].ckid;
 737               if(avi_stream_id(id)==d_video->id) ++priv->skip_video_frames;
 738             }
 739             // requires for correct audio pts calculation (demuxer):
 740             priv->avi_video_pts-=priv->skip_video_frames*(float)sh_video->video.dwScale/(float)sh_video->video.dwRate;
 741             priv->avi_audio_pts=priv->avi_video_pts;
 742             // set index position:
 743             priv->idx_pos_a=priv->idx_pos_v=priv->idx_pos=audio_chunk_pos;
 744           }
 745         } else {
 746             // non-interleaved stream:
 747             priv->idx_pos_a=audio_chunk_pos;
 748             priv->idx_pos_v=video_chunk_pos;
 749             priv->idx_pos=(audio_chunk_pos<video_chunk_pos)?audio_chunk_pos:video_chunk_pos;
 750         }
 751
 752           mp_msg(MSGT_SEEK,MSGL_V,"SEEK: idx=%d  (a:%d v:%d)  v.skip=%d  a.skip=%d/%4.3f  \n",
 753             (int)priv->idx_pos,audio_chunk_pos,video_chunk_pos,
 754             (int)priv->skip_video_frames,skip_audio_bytes,skip_audio_secs);
 755
 756           if(skip_audio_bytes){
 757             demux_read_data(d_audio,NULL,skip_audio_bytes);
 758           }
 759
 760       }
 761         d_video->pts=priv->avi_video_pts; // OSD
 762
 763 }
 764
 765
 766 static void demux_close_avi(demuxer_t *demuxer)
 767 {
 768   avi_priv_t* priv=demuxer->priv;
 769
 770   if(!priv)
 771     return;
 772
 773   if(priv->idx_size > 0)
 774     free(priv->idx);
 775   free(priv);
 776 }
 777
 778
 779 static int demux_avi_control(demuxer_t *demuxer,int cmd, void *arg){
 780     avi_priv_t *priv=demuxer->priv;
 781     demux_stream_t *d_video=demuxer->video;
 782     sh_video_t *sh_video=d_video->sh;
 783
 784     switch(cmd) {
 785         case DEMUXER_CTRL_GET_TIME_LENGTH:
 786             if (!priv->numberofframes || !sh_video) return DEMUXER_CTRL_DONTKNOW;
 787             *((double *)arg)=(double)priv->numberofframes/sh_video->fps;
 788             if (sh_video->video.dwLength<=1) return DEMUXER_CTRL_GUESS;
 789             return DEMUXER_CTRL_OK;
 790
 791         case DEMUXER_CTRL_GET_PERCENT_POS:
 792             if (!priv->numberofframes || !sh_video) {
 793               return DEMUXER_CTRL_DONTKNOW;
 794             }
 795             *((int *)arg)=(int)(priv->video_pack_no*100/priv->numberofframes);
 796             if (sh_video->video.dwLength<=1) return DEMUXER_CTRL_GUESS;
 797             return DEMUXER_CTRL_OK;
 798
 799         case DEMUXER_CTRL_SWITCH_AUDIO:
 800         case DEMUXER_CTRL_SWITCH_VIDEO: {
 801             int audio = (cmd == DEMUXER_CTRL_SWITCH_AUDIO);
 802             demux_stream_t *ds = audio ? demuxer->audio : demuxer->video;
 803             void **streams = audio ? demuxer->a_streams : demuxer->v_streams;
 804             int maxid = FFMIN(100, audio ? MAX_A_STREAMS : MAX_V_STREAMS);
 805             int chunkid;
 806             if (ds->id < -1)
 807               return DEMUXER_CTRL_NOTIMPL;
 808
 809             if (*(int *)arg >= 0)
 810               ds->id = *(int *)arg;
 811             else {
 812               int i;
 813               for (i = 0; i < maxid; i++) {
 814                 if (++ds->id >= maxid) ds->id = 0;
 815                 if (streams[ds->id]) break;
 816               }
 817             }
 818
 819             chunkid = (ds->id / 10 + '0') | (ds->id % 10 + '0') << 8;
 820             ds->sh = NULL;
 821             if (!streams[ds->id]) // stream not available
 822               ds->id = -1;
 823             else
 824               demux_avi_select_stream(demuxer, chunkid);
 825             *(int *)arg = ds->id;
 826             return DEMUXER_CTRL_OK;
 827         }
 828
 829         default:
 830             return DEMUXER_CTRL_NOTIMPL;
 831     }
 832 }
 833
 834
 835 static int avi_check_file(demuxer_t *demuxer)
 836 {
 837   int id=stream_read_dword_le(demuxer->stream); // "RIFF"
 838
 839   if((id==mmioFOURCC('R','I','F','F')) || (id==mmioFOURCC('O','N','2',' '))) {
 840     stream_read_dword_le(demuxer->stream); //filesize
 841     id=stream_read_dword_le(demuxer->stream); // "AVI "
 842     if(id==formtypeAVI)
 843       return DEMUXER_TYPE_AVI;
 844     // "Samsung Digimax i6 PMP" crap according to bug 742
 845     if(id==mmioFOURCC('A','V','I',0x19))
 846       return DEMUXER_TYPE_AVI;
 847     if(id==mmioFOURCC('O','N','2','f')){
 848       mp_tmsg(MSGT_DEMUXER,MSGL_INFO,"ON2 AVI format");
 849       return DEMUXER_TYPE_AVI;
 850     }
 851   }
 852
 853   return 0;
 854 }
 855
 856
 857 static demuxer_t* demux_open_hack_avi(demuxer_t *demuxer)
 858 {
 859    struct MPOpts *opts = demuxer->opts;
 860    sh_audio_t* sh_a;
 861
 862    demuxer = demux_open_avi(demuxer);
 863    if(!demuxer) return NULL; // failed to open
 864    sh_a = demuxer->audio->sh;
 865    if(demuxer->audio->id != -2 && sh_a) {
 866 #ifdef CONFIG_OGGVORBIS
 867     // support for Ogg-in-AVI:
 868     if(sh_a->format == 0xFFFE)
 869       demuxer = init_avi_with_ogg(demuxer);
 870     else if(sh_a->format == 0x674F) {
 871       stream_t* s;
 872       demuxer_t  *od;
 873       s = new_ds_stream(demuxer->audio);
 874       od = new_demuxer(opts, s,DEMUXER_TYPE_OGG,-1,-2,-2,NULL);
 875       if(!demux_ogg_open(od)) {
 876         mp_tmsg( MSGT_DEMUXER,MSGL_ERR,"Unable to open the Ogg demuxer.\n");
 877         free_stream(s);
 878         demuxer->audio->id = -2;
 879       } else
 880         demuxer = new_demuxers_demuxer(demuxer,od,demuxer);
 881    }
 882 #endif
 883    }
 884
 885    return demuxer;
 886 }
 887
 888
 889 const demuxer_desc_t demuxer_desc_avi = {
 890   "AVI demuxer",
 891   "avi",
 892   "AVI",
 893   "Arpi?",
 894   "AVI files, including non interleaved files",
 895   DEMUXER_TYPE_AVI,
 896   1, // safe autodetect
 897   avi_check_file,
 898   demux_avi_fill_buffer,
 899   demux_open_hack_avi,
 900   demux_close_avi,
 901   demux_seek_avi,
 902   demux_avi_control
 903 };
 904
 905 const demuxer_desc_t demuxer_desc_avi_ni = {
 906   "AVI demuxer, non-interleaved",
 907   "avini",
 908   "AVI",
 909   "Arpi?",
 910   "AVI files, including non interleaved files",
 911   DEMUXER_TYPE_AVI,
 912   1, // safe autodetect
 913   avi_check_file,
 914   demux_avi_fill_buffer_ni,
 915   demux_open_hack_avi,
 916   demux_close_avi,
 917   demux_seek_avi,
 918   demux_avi_control
 919 };
 920
 921 const demuxer_desc_t demuxer_desc_avi_nini = {
 922   "AVI demuxer, non-interleaved and no index",
 923   "avinini",
 924   "AVI",
 925   "Arpi?",
 926   "AVI files, including non interleaved files",
 927   DEMUXER_TYPE_AVI,
 928   1, // safe autodetect
 929   avi_check_file,
 930   demux_avi_fill_buffer_nini,
 931   demux_open_hack_avi,
 932   demux_close_avi,
 933   demux_seek_avi,
 934   demux_avi_control
 935 };