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 choose_chunk_len(unsigned int len1,unsigned int len2){
 112     // len1 has a bit more priority than len2. len1!=len2
 113     // Note: this is a first-idea-logic, may be wrong. comments welcomed.
 114
 115     // prefer small frames rather than 0
 116     if(!len1) return (len2>0x80000) ? len1 : len2;
 117     if(!len2) return (len1>0x100000) ? len2 : len1;
 118
 119     // choose the smaller value:
 120     return (len1<len2)? len1 : len2;
 121 }
 122
 123 static int demux_avi_read_packet(demuxer_t *demux,demux_stream_t *ds,unsigned int id,unsigned int len,int idxpos,int flags){
 124   avi_priv_t *priv=demux->priv;
 125   int skip;
 126   float pts=0;
 127
 128   mp_dbg(MSGT_DEMUX,MSGL_DBG3,"demux_avi.read_packet: %X\n",id);
 129
 130   if(ds==demux->audio){
 131       if(priv->pts_corrected==0){
 132           if(priv->pts_has_video){
 133               // we have video pts now
 134               float delay=0;
 135               if(((sh_audio_t*)(ds->sh))->wf->nAvgBytesPerSec)
 136                   delay=(float)priv->pts_corr_bytes/((sh_audio_t*)(ds->sh))->wf->nAvgBytesPerSec;
 137               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);
 138               //priv->pts_correction=-priv->avi_audio_pts+delay;
 139               priv->pts_correction=delay-priv->avi_audio_pts;
 140               priv->avi_audio_pts+=priv->pts_correction;
 141               priv->pts_corrected=1;
 142           } else
 143               priv->pts_corr_bytes+=len;
 144       }
 145       if(pts_from_bps){
 146           pts = priv->audio_block_no *
 147             (float)((sh_audio_t*)demux->audio->sh)->audio.dwScale /
 148             (float)((sh_audio_t*)demux->audio->sh)->audio.dwRate;
 149       } else
 150           pts=priv->avi_audio_pts; //+priv->pts_correction;
 151       priv->avi_audio_pts=0;
 152       // update blockcount:
 153       priv->audio_block_no+=priv->audio_block_size ?
 154         ((len+priv->audio_block_size-1)/priv->audio_block_size) : 1;
 155   } else
 156   if(ds==demux->video){
 157      // video
 158      if(priv->skip_video_frames>0){
 159        // drop frame (seeking)
 160        --priv->skip_video_frames;
 161        ds=NULL;
 162      }
 163
 164      pts = priv->avi_video_pts = priv->video_pack_no *
 165          (float)((sh_video_t*)demux->video->sh)->video.dwScale /
 166          (float)((sh_video_t*)demux->video->sh)->video.dwRate;
 167
 168      priv->avi_audio_pts=priv->avi_video_pts+priv->pts_correction;
 169      priv->pts_has_video=1;
 170
 171      if(ds) ++priv->video_pack_no;
 172
 173   }
 174
 175   skip=(len+1)&(~1); // total bytes in this chunk
 176
 177   if(ds){
 178     mp_dbg(MSGT_DEMUX,MSGL_DBG2,"DEMUX_AVI: Read %d data bytes from packet %04X\n",len,id);
 179     ds_read_packet(ds,demux->stream,len,pts,idxpos,flags);
 180     skip-=len;
 181   }
 182   skip = FFMAX(skip, 0);
 183   if (avi_stream_id(id) > 99 && id != mmioFOURCC('J','U','N','K'))
 184     skip = FFMIN(skip, 65536);
 185   if(skip){
 186     mp_dbg(MSGT_DEMUX,MSGL_DBG2,"DEMUX_AVI: Skipping %d bytes from packet %04X\n",skip,id);
 187     stream_skip(demux->stream,skip);
 188   }
 189   return ds?1:0;
 190 }
 191
 192 static uint32_t avi_find_id(stream_t *stream) {
 193   uint32_t id = stream_read_dword_le(stream);
 194   if (!id) {
 195     mp_msg(MSGT_DEMUX, MSGL_WARN, "Incomplete stream? Trying resync.\n");
 196     do {
 197       id = stream_read_dword_le(stream);
 198       if (stream_eof(stream)) return 0;
 199     } while (avi_stream_id(id) > 99);
 200   }
 201   return id;
 202 }
 203
 204 // return value:
 205 //     0 = EOF or no stream found
 206 //     1 = successfully read a packet
 207 static int demux_avi_fill_buffer(demuxer_t *demux, demux_stream_t *dsds){
 208 avi_priv_t *priv=demux->priv;
 209 unsigned int id=0;
 210 unsigned int len;
 211 int ret=0;
 212 demux_stream_t *ds;
 213
 214 do{
 215   int flags=1;
 216   AVIINDEXENTRY *idx=NULL;
 217   if(priv->idx_size>0 && priv->idx_pos<priv->idx_size){
 218     off_t pos;
 219
 220     idx=&((AVIINDEXENTRY *)priv->idx)[priv->idx_pos++];
 221
 222     if(idx->dwFlags&AVIIF_LIST){
 223       // LIST
 224       continue;
 225     }
 226     if(!demux_avi_select_stream(demux,idx->ckid)){
 227       mp_dbg(MSGT_DEMUX,MSGL_DBG3,"Skip chunk %.4s (0x%X)  \n",(char *)&idx->ckid,(unsigned int)idx->ckid);
 228       continue; // skip this chunk
 229     }
 230
 231     pos = (off_t)priv->idx_offset+AVI_IDX_OFFSET(idx);
 232     if((pos<demux->movi_start || pos>=demux->movi_end) && (demux->movi_end>demux->movi_start) && (demux->stream->flags & STREAM_SEEK)){
 233       mp_msg(MSGT_DEMUX,MSGL_V,"ChunkOffset out of range!   idx=0x%"PRIX64"  \n",(int64_t)pos);
 234       continue;
 235     }
 236     stream_seek(demux->stream,pos);
 237     demux->filepos=stream_tell(demux->stream);
 238     id=stream_read_dword_le(demux->stream);
 239     if(stream_eof(demux->stream)) return 0; // EOF!
 240
 241     if(id!=idx->ckid){
 242       mp_msg(MSGT_DEMUX,MSGL_V,"ChunkID mismatch! raw=%.4s idx=%.4s  \n",(char *)&id,(char *)&idx->ckid);
 243       if(valid_fourcc(idx->ckid))
 244           id=idx->ckid; // use index if valid
 245       else
 246           if(!valid_fourcc(id)) continue; // drop chunk if both id and idx bad
 247     }
 248     len=stream_read_dword_le(demux->stream);
 249     if((len!=idx->dwChunkLength)&&((len+1)!=idx->dwChunkLength)){
 250       mp_msg(MSGT_DEMUX,MSGL_V,"ChunkSize mismatch! raw=%d idx=%d  \n",len,idx->dwChunkLength);
 251       if(len>0x200000 && idx->dwChunkLength>0x200000) continue; // both values bad :(
 252       len=choose_chunk_len(idx->dwChunkLength,len);
 253     }
 254     if(!(idx->dwFlags&AVIIF_KEYFRAME)) flags=0;
 255   } else {
 256     demux->filepos=stream_tell(demux->stream);
 257     if(demux->filepos>=demux->movi_end && demux->movi_end>demux->movi_start && (demux->stream->flags & STREAM_SEEK)){
 258           demux->stream->eof=1;
 259           return 0;
 260     }
 261     id=avi_find_id(demux->stream);
 262     len=stream_read_dword_le(demux->stream);
 263     if(stream_eof(demux->stream)) return 0; // EOF!
 264
 265     if(id==mmioFOURCC('L','I','S','T') || id==mmioFOURCC('R', 'I', 'F', 'F')){
 266       id=stream_read_dword_le(demux->stream); // list or RIFF type
 267       continue;
 268     }
 269   }
 270
 271   ds=demux_avi_select_stream(demux,id);
 272   if(ds)
 273     if(ds->packs+1>=MAX_PACKS || ds->bytes+len>=MAX_PACK_BYTES){
 274         // this packet will cause a buffer overflow, switch to -ni mode!!!
 275         mp_tmsg(MSGT_DEMUX,MSGL_WARN,"\nBadly interleaved AVI file detected - switching to -ni mode...\n");
 276         if(priv->idx_size>0){
 277             // has index
 278             demux->type=DEMUXER_TYPE_AVI_NI;
 279             demux->desc=&demuxer_desc_avi_ni;
 280             --priv->idx_pos; // hack
 281         } else {
 282             // no index
 283             demux->type=DEMUXER_TYPE_AVI_NINI;
 284             demux->desc=&demuxer_desc_avi_nini;
 285             priv->idx_pos=demux->filepos; // hack
 286         }
 287         priv->idx_pos_v=priv->idx_pos_a=priv->idx_pos;
 288         // quit now, we can't even (no enough buffer memory) read this packet :(
 289         return -1;
 290     }
 291
 292   ret=demux_avi_read_packet(demux,ds,id,len,priv->idx_pos-1,flags);
 293 } while(ret!=1);
 294   return 1;
 295 }
 296
 297
 298 // return value:
 299 //     0 = EOF or no stream found
 300 //     1 = successfully read a packet
 301 static int demux_avi_fill_buffer_ni(demuxer_t *demux,demux_stream_t* ds){
 302 avi_priv_t *priv=demux->priv;
 303 unsigned int id=0;
 304 unsigned int len;
 305 int ret=0;
 306
 307 do{
 308   int flags=1;
 309   AVIINDEXENTRY *idx=NULL;
 310   int idx_pos=0;
 311   demux->filepos=stream_tell(demux->stream);
 312
 313   if(ds==demux->video) idx_pos=priv->idx_pos_v++; else
 314   if(ds==demux->audio) idx_pos=priv->idx_pos_a++; else
 315                        idx_pos=priv->idx_pos++;
 316
 317   if(priv->idx_size>0 && idx_pos<priv->idx_size){
 318     off_t pos;
 319     idx=&((AVIINDEXENTRY *)priv->idx)[idx_pos];
 320
 321     if(idx->dwFlags&AVIIF_LIST){
 322       // LIST
 323       continue;
 324     }
 325     if(ds && demux_avi_select_stream(demux,idx->ckid)!=ds){
 326       mp_dbg(MSGT_DEMUX,MSGL_DBG3,"Skip chunk %.4s (0x%X)  \n",(char *)&idx->ckid,(unsigned int)idx->ckid);
 327       continue; // skip this chunk
 328     }
 329
 330     pos = priv->idx_offset+AVI_IDX_OFFSET(idx);
 331     if((pos<demux->movi_start || pos>=demux->movi_end) && (demux->movi_end>demux->movi_start)){
 332       mp_msg(MSGT_DEMUX,MSGL_V,"ChunkOffset out of range!  current=0x%"PRIX64"  idx=0x%"PRIX64"  \n",(int64_t)demux->filepos,(int64_t)pos);
 333       continue;
 334     }
 335     stream_seek(demux->stream,pos);
 336
 337     id=stream_read_dword_le(demux->stream);
 338
 339     if(stream_eof(demux->stream)) return 0;
 340
 341     if(id!=idx->ckid){
 342       mp_msg(MSGT_DEMUX,MSGL_V,"ChunkID mismatch! raw=%.4s idx=%.4s  \n",(char *)&id,(char *)&idx->ckid);
 343       if(valid_fourcc(idx->ckid))
 344           id=idx->ckid; // use index if valid
 345       else
 346           if(!valid_fourcc(id)) continue; // drop chunk if both id and idx bad
 347     }
 348     len=stream_read_dword_le(demux->stream);
 349     if((len!=idx->dwChunkLength)&&((len+1)!=idx->dwChunkLength)){
 350       mp_msg(MSGT_DEMUX,MSGL_V,"ChunkSize mismatch! raw=%d idx=%d  \n",len,idx->dwChunkLength);
 351       if(len>0x200000 && idx->dwChunkLength>0x200000) continue; // both values bad :(
 352       len=choose_chunk_len(idx->dwChunkLength,len);
 353     }
 354     if(!(idx->dwFlags&AVIIF_KEYFRAME)) flags=0;
 355   } else return 0;
 356   ret=demux_avi_read_packet(demux,demux_avi_select_stream(demux,id),id,len,idx_pos,flags);
 357 } while(ret!=1);
 358   return 1;
 359 }
 360
 361
 362 // return value:
 363 //     0 = EOF or no stream found
 364 //     1 = successfully read a packet
 365 static int demux_avi_fill_buffer_nini(demuxer_t *demux,demux_stream_t* ds){
 366 avi_priv_t *priv=demux->priv;
 367 unsigned int id=0;
 368 unsigned int len;
 369 int ret=0;
 370 off_t *fpos=NULL;
 371
 372   if(ds==demux->video) fpos=&priv->idx_pos_v; else
 373   if(ds==demux->audio) fpos=&priv->idx_pos_a; else
 374   return 0;
 375
 376   stream_seek(demux->stream,fpos[0]);
 377
 378 do{
 379
 380   demux->filepos=stream_tell(demux->stream);
 381   if(demux->filepos>=demux->movi_end && (demux->movi_end>demux->movi_start)){
 382           ds->eof=1;
 383           return 0;
 384   }
 385
 386   id=avi_find_id(demux->stream);
 387   len=stream_read_dword_le(demux->stream);
 388
 389   if(stream_eof(demux->stream)) return 0;
 390
 391   if(id==mmioFOURCC('L','I','S','T')){
 392       id=stream_read_dword_le(demux->stream);      // list type
 393       continue;
 394   }
 395
 396   if(id==mmioFOURCC('R','I','F','F')){
 397       mp_msg(MSGT_DEMUX,MSGL_V,"additional RIFF header...\n");
 398       id=stream_read_dword_le(demux->stream);      // "AVIX"
 399       continue;
 400   }
 401
 402   if(ds==demux_avi_select_stream(demux,id)){
 403     // read it!
 404     ret=demux_avi_read_packet(demux,ds,id,len,priv->idx_pos-1,0);
 405   } else {
 406     // skip it!
 407     int skip=(len+1)&(~1); // total bytes in this chunk
 408     stream_skip(demux->stream,skip);
 409   }
 410
 411 } while(ret!=1);
 412   fpos[0]=stream_tell(demux->stream);
 413   return 1;
 414 }
 415
 416 // AVI demuxer parameters:
 417 int index_mode=-1;  // -1=untouched  0=don't use index  1=use (generate) index
 418 char *index_file_save = NULL, *index_file_load = NULL;
 419 int force_ni=0;     // force non-interleaved AVI parsing
 420
 421 void read_avi_header(demuxer_t *demuxer,int index_mode);
 422
 423 static demuxer_t* demux_open_avi(demuxer_t* demuxer){
 424     demux_stream_t *d_audio=demuxer->audio;
 425     demux_stream_t *d_video=demuxer->video;
 426     sh_audio_t *sh_audio=NULL;
 427     sh_video_t *sh_video=NULL;
 428     avi_priv_t* priv=malloc(sizeof(avi_priv_t));
 429
 430   // priv struct:
 431   priv->avi_audio_pts=priv->avi_video_pts=0.0f;
 432   priv->pts_correction=0.0f;
 433   priv->skip_video_frames=0;
 434   priv->pts_corr_bytes=0;
 435   priv->pts_has_video=priv->pts_corrected=0;
 436   priv->video_pack_no=0;
 437   priv->audio_block_no=0;
 438   priv->audio_block_size=0;
 439   priv->isodml = 0;
 440   priv->suidx_size = 0;
 441   priv->suidx = NULL;
 442
 443   demuxer->priv=(void*)priv;
 444
 445   //---- AVI header:
 446   read_avi_header(demuxer,(demuxer->stream->flags & STREAM_SEEK_BW)?index_mode:-2);
 447
 448   if(demuxer->audio->id>=0 && !demuxer->a_streams[demuxer->audio->id]){
 449       mp_tmsg(MSGT_DEMUX,MSGL_WARN,"AVI: invalid audio stream ID: %d - ignoring (nosound)\n",demuxer->audio->id);
 450       demuxer->audio->id=-2; // disabled
 451   }
 452   if(demuxer->video->id>=0 && !demuxer->v_streams[demuxer->video->id]){
 453       mp_tmsg(MSGT_DEMUX,MSGL_WARN,"AVI: invalid video stream ID: %d - ignoring (using default)\n",demuxer->video->id);
 454       demuxer->video->id=-1; // autodetect
 455   }
 456
 457   stream_reset(demuxer->stream);
 458   stream_seek(demuxer->stream,demuxer->movi_start);
 459   priv->idx_pos=0;
 460   priv->idx_pos_a=0;
 461   priv->idx_pos_v=0;
 462   if(priv->idx_size>1){
 463     // decide index format:
 464 #if 1
 465     if((AVI_IDX_OFFSET(&((AVIINDEXENTRY *)priv->idx)[0])<demuxer->movi_start ||
 466         AVI_IDX_OFFSET(&((AVIINDEXENTRY *)priv->idx)[1])<demuxer->movi_start )&& !priv->isodml)
 467       priv->idx_offset=demuxer->movi_start-4;
 468     else
 469       priv->idx_offset=0;
 470 #else
 471     if(AVI_IDX_OFFSET(&((AVIINDEXENTRY *)priv->idx)[0])<demuxer->movi_start)
 472       priv->idx_offset=demuxer->movi_start-4;
 473     else
 474       priv->idx_offset=0;
 475 #endif
 476     mp_msg(MSGT_DEMUX,MSGL_V,"AVI index offset: 0x%X (movi=0x%X idx0=0x%X idx1=0x%X)\n",
 477             (int)priv->idx_offset,(int)demuxer->movi_start,
 478             (int)((AVIINDEXENTRY *)priv->idx)[0].dwChunkOffset,
 479             (int)((AVIINDEXENTRY *)priv->idx)[1].dwChunkOffset);
 480   }
 481
 482   if(priv->idx_size>0){
 483       // check that file is non-interleaved:
 484       int i;
 485       off_t a_pos=-1;
 486       off_t v_pos=-1;
 487       for(i=0;i<priv->idx_size;i++){
 488         AVIINDEXENTRY* idx=&((AVIINDEXENTRY *)priv->idx)[i];
 489         demux_stream_t* ds=demux_avi_select_stream(demuxer,idx->ckid);
 490         off_t pos = priv->idx_offset + AVI_IDX_OFFSET(idx);
 491         if(a_pos==-1 && ds==demuxer->audio){
 492           a_pos=pos;
 493           if(v_pos!=-1) break;
 494         }
 495         if(v_pos==-1 && ds==demuxer->video){
 496           v_pos=pos;
 497           if(a_pos!=-1) break;
 498         }
 499       }
 500       if(v_pos==-1){
 501         mp_tmsg(MSGT_DEMUX,MSGL_ERR,"AVI_NI: " "No video stream found.\n");
 502         return NULL;
 503       }
 504       if(a_pos==-1){
 505         d_audio->sh=sh_audio=NULL;
 506       } else {
 507         if(force_ni || abs(a_pos-v_pos)>0x100000){  // distance > 1MB
 508           mp_tmsg(MSGT_DEMUX,MSGL_INFO,"%s NON-INTERLEAVED AVI file format.\n",force_ni?"Forced":"Detected");
 509           demuxer->type=DEMUXER_TYPE_AVI_NI; // HACK!!!!
 510           demuxer->desc=&demuxer_desc_avi_ni; // HACK!!!!
 511           pts_from_bps=1; // force BPS sync!
 512         }
 513       }
 514   } else {
 515       // no index
 516       if(force_ni){
 517           mp_tmsg(MSGT_DEMUX,MSGL_INFO,"Using NON-INTERLEAVED broken AVI file format.\n");
 518           demuxer->type=DEMUXER_TYPE_AVI_NINI; // HACK!!!!
 519           demuxer->desc=&demuxer_desc_avi_nini; // HACK!!!!
 520           priv->idx_pos_a=
 521           priv->idx_pos_v=demuxer->movi_start;
 522           pts_from_bps=1; // force BPS sync!
 523       }
 524       demuxer->seekable=0;
 525   }
 526   if(!ds_fill_buffer(d_video)){
 527     mp_tmsg(MSGT_DEMUX,MSGL_ERR,"AVI: " "Missing video stream!? Contact the author, it may be a bug :(\n");
 528     return NULL;
 529   }
 530   sh_video=d_video->sh;sh_video->ds=d_video;
 531   if(d_audio->id!=-2){
 532     mp_msg(MSGT_DEMUX,MSGL_V,"AVI: Searching for audio stream (id:%d)\n",d_audio->id);
 533     if(!priv->audio_streams || !ds_fill_buffer(d_audio)){
 534       mp_tmsg(MSGT_DEMUX,MSGL_INFO,"AVI: " "No audio stream found -> no sound.\n");
 535       d_audio->sh=sh_audio=NULL;
 536     } else {
 537       sh_audio=d_audio->sh;sh_audio->ds=d_audio;
 538     }
 539   }
 540
 541   // calculating audio/video bitrate:
 542   if(priv->idx_size>0){
 543     // we have index, let's count 'em!
 544     int64_t vsize=0;
 545     int64_t asize=0;
 546     size_t vsamples=0;
 547     size_t asamples=0;
 548     int i;
 549     for(i=0;i<priv->idx_size;i++){
 550       int id=avi_stream_id(((AVIINDEXENTRY *)priv->idx)[i].ckid);
 551       int len=((AVIINDEXENTRY *)priv->idx)[i].dwChunkLength;
 552       if(sh_video->ds->id == id) {
 553         vsize+=len;
 554         ++vsamples;
 555       }
 556       else if(sh_audio && sh_audio->ds->id == id) {
 557         asize+=len;
 558         asamples+=(len+priv->audio_block_size-1)/priv->audio_block_size;
 559       }
 560     }
 561     mp_msg(MSGT_DEMUX,MSGL_V,"AVI video size=%"PRId64" (%u) audio size=%"PRId64" (%u)\n",vsize,vsamples,asize,asamples);
 562     priv->numberofframes=vsamples;
 563     sh_video->i_bps=((float)vsize/(float)vsamples)*(float)sh_video->video.dwRate/(float)sh_video->video.dwScale;
 564     if(sh_audio) sh_audio->i_bps=((float)asize/(float)asamples)*(float)sh_audio->audio.dwRate/(float)sh_audio->audio.dwScale;
 565   } else {
 566     // guessing, results may be inaccurate:
 567     int64_t vsize;
 568     int64_t asize=0;
 569
 570     if((priv->numberofframes=sh_video->video.dwLength)<=1)
 571       // bad video header, try to get number of frames from audio
 572       if(sh_audio && sh_audio->wf->nAvgBytesPerSec) priv->numberofframes=sh_video->fps*sh_audio->audio.dwLength/sh_audio->audio.dwRate*sh_audio->audio.dwScale;
 573     if(priv->numberofframes<=1){
 574       mp_tmsg(MSGT_SEEK,MSGL_WARN,"Could not determine number of frames (for absolute seek).\n");
 575       priv->numberofframes=0;
 576     }
 577
 578     if(sh_audio){
 579       if(sh_audio->wf->nAvgBytesPerSec && sh_audio->audio.dwSampleSize!=1){
 580         asize=(float)sh_audio->wf->nAvgBytesPerSec*sh_audio->audio.dwLength*sh_audio->audio.dwScale/sh_audio->audio.dwRate;
 581       } else {
 582         asize=sh_audio->audio.dwLength;
 583         sh_audio->i_bps=(float)asize/(sh_video->frametime*priv->numberofframes);
 584       }
 585     }
 586     vsize=demuxer->movi_end-demuxer->movi_start-asize-8*priv->numberofframes;
 587     mp_msg(MSGT_DEMUX,MSGL_V,"AVI video size=%"PRId64" (%u)  audio size=%"PRId64"\n",vsize,priv->numberofframes,asize);
 588     sh_video->i_bps=(float)vsize/(sh_video->frametime*priv->numberofframes);
 589   }
 590
 591   return demuxer;
 592
 593 }
 594
 595
 596 static void demux_seek_avi(demuxer_t *demuxer,float rel_seek_secs,float audio_delay,int flags){
 597     avi_priv_t *priv=demuxer->priv;
 598     demux_stream_t *d_audio=demuxer->audio;
 599     demux_stream_t *d_video=demuxer->video;
 600     sh_audio_t *sh_audio=d_audio->sh;
 601     sh_video_t *sh_video=d_video->sh;
 602     float skip_audio_secs=0;
 603
 604   //FIXME: OFF_T - Didn't check AVI case yet (avi files can't be >2G anyway?)
 605   //================= seek in AVI ==========================
 606     int rel_seek_frames=rel_seek_secs*sh_video->fps;
 607     int video_chunk_pos=d_video->pos;
 608     int i;
 609
 610       if(flags&SEEK_ABSOLUTE){
 611         // seek absolute
 612         video_chunk_pos=0;
 613       }
 614
 615       if(flags&SEEK_FACTOR){
 616         rel_seek_frames=rel_seek_secs*priv->numberofframes;
 617       }
 618
 619       priv->skip_video_frames=0;
 620       priv->avi_audio_pts=0;
 621
 622 // ------------ STEP 1: find nearest video keyframe chunk ------------
 623       // find nearest video keyframe chunk pos:
 624       if(rel_seek_frames>0){
 625         // seek forward
 626         while(video_chunk_pos<priv->idx_size-1){
 627           int id=((AVIINDEXENTRY *)priv->idx)[video_chunk_pos].ckid;
 628           if(avi_stream_id(id)==d_video->id){  // video frame
 629             if((--rel_seek_frames)<0 && ((AVIINDEXENTRY *)priv->idx)[video_chunk_pos].dwFlags&AVIIF_KEYFRAME) break;
 630           }
 631           ++video_chunk_pos;
 632         }
 633       } else {
 634         // seek backward
 635         while(video_chunk_pos>0){
 636           int id=((AVIINDEXENTRY *)priv->idx)[video_chunk_pos].ckid;
 637           if(avi_stream_id(id)==d_video->id){  // video frame
 638             if((++rel_seek_frames)>0 && ((AVIINDEXENTRY *)priv->idx)[video_chunk_pos].dwFlags&AVIIF_KEYFRAME) break;
 639           }
 640           --video_chunk_pos;
 641         }
 642       }
 643       priv->idx_pos_a=priv->idx_pos_v=priv->idx_pos=video_chunk_pos;
 644
 645       // re-calc video pts:
 646       d_video->pack_no=0;
 647       for(i=0;i<video_chunk_pos;i++){
 648           int id=((AVIINDEXENTRY *)priv->idx)[i].ckid;
 649           if(avi_stream_id(id)==d_video->id) ++d_video->pack_no;
 650       }
 651       priv->video_pack_no=
 652       sh_video->num_frames=sh_video->num_frames_decoded=d_video->pack_no;
 653       priv->avi_video_pts=d_video->pack_no*(float)sh_video->video.dwScale/(float)sh_video->video.dwRate;
 654       d_video->pos=video_chunk_pos;
 655
 656       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);
 657
 658 // ------------ STEP 2: seek audio, find the right chunk & pos ------------
 659
 660       d_audio->pack_no=0;
 661       priv->audio_block_no=0;
 662       d_audio->dpos=0;
 663
 664       if(sh_audio){
 665         int i;
 666         int len=0;
 667         int skip_audio_bytes=0;
 668         int curr_audio_pos=-1;
 669         int audio_chunk_pos=-1;
 670         int chunk_max=(demuxer->type==DEMUXER_TYPE_AVI)?video_chunk_pos:priv->idx_size;
 671
 672         if(sh_audio->audio.dwSampleSize){
 673             // constant rate audio stream
 674             /* immediate seeking to audio position, including when streams are delayed */
 675             curr_audio_pos=(priv->avi_video_pts + audio_delay)*(float)sh_audio->audio.dwRate/(float)sh_audio->audio.dwScale;
 676             curr_audio_pos*=sh_audio->audio.dwSampleSize;
 677
 678         // find audio chunk pos:
 679           for(i=0;i<chunk_max;i++){
 680             int id=((AVIINDEXENTRY *)priv->idx)[i].ckid;
 681             if(avi_stream_id(id)==d_audio->id){
 682                 len=((AVIINDEXENTRY *)priv->idx)[i].dwChunkLength;
 683                 if(d_audio->dpos<=curr_audio_pos && curr_audio_pos<(d_audio->dpos+len)){
 684                   break;
 685                 }
 686                 ++d_audio->pack_no;
 687                 priv->audio_block_no+=priv->audio_block_size ?
 688                     ((len+priv->audio_block_size-1)/priv->audio_block_size) : 1;
 689                 d_audio->dpos+=len;
 690             }
 691           }
 692           audio_chunk_pos=i;
 693           skip_audio_bytes=curr_audio_pos-d_audio->dpos;
 694
 695           mp_msg(MSGT_SEEK,MSGL_V,"SEEK: i=%d (max:%d) dpos=%d (wanted:%d)  \n",
 696               i,chunk_max,(int)d_audio->dpos,curr_audio_pos);
 697
 698         } else {
 699             // VBR audio
 700             /* immediate seeking to audio position, including when streams are delayed */
 701             int chunks=(priv->avi_video_pts + audio_delay)*(float)sh_audio->audio.dwRate/(float)sh_audio->audio.dwScale;
 702             audio_chunk_pos=0;
 703
 704         // find audio chunk pos:
 705           for(i=0;i<priv->idx_size && chunks>0;i++){
 706             int id=((AVIINDEXENTRY *)priv->idx)[i].ckid;
 707             if(avi_stream_id(id)==d_audio->id){
 708                 len=((AVIINDEXENTRY *)priv->idx)[i].dwChunkLength;
 709                 if(i>chunk_max){
 710                   skip_audio_bytes+=len;
 711                 } else {
 712                   ++d_audio->pack_no;
 713                   priv->audio_block_no+=priv->audio_block_size ?
 714                     ((len+priv->audio_block_size-1)/priv->audio_block_size) : 1;
 715                   d_audio->dpos+=len;
 716                   audio_chunk_pos=i;
 717                 }
 718                 if(priv->audio_block_size)
 719                     chunks-=(len+priv->audio_block_size-1)/priv->audio_block_size;
 720             }
 721           }
 722         }
 723
 724         // Now we have:
 725         //      audio_chunk_pos = chunk no in index table (it's <=chunk_max)
 726         //      skip_audio_bytes = bytes to be skipped after chunk seek
 727         //      d-audio->pack_no = chunk_no in stream at audio_chunk_pos
 728         //      d_audio->dpos = bytepos in stream at audio_chunk_pos
 729         // let's seek!
 730
 731           // update stream position:
 732           d_audio->pos=audio_chunk_pos;
 733
 734         if(demuxer->type==DEMUXER_TYPE_AVI){
 735           // interleaved stream:
 736           if(audio_chunk_pos<video_chunk_pos){
 737             // calc priv->skip_video_frames & adjust video pts counter:
 738             for(i=audio_chunk_pos;i<video_chunk_pos;i++){
 739               int id=((AVIINDEXENTRY *)priv->idx)[i].ckid;
 740               if(avi_stream_id(id)==d_video->id) ++priv->skip_video_frames;
 741             }
 742             // requires for correct audio pts calculation (demuxer):
 743             priv->avi_video_pts-=priv->skip_video_frames*(float)sh_video->video.dwScale/(float)sh_video->video.dwRate;
 744             priv->avi_audio_pts=priv->avi_video_pts;
 745             // set index position:
 746             priv->idx_pos_a=priv->idx_pos_v=priv->idx_pos=audio_chunk_pos;
 747           }
 748         } else {
 749             // non-interleaved stream:
 750             priv->idx_pos_a=audio_chunk_pos;
 751             priv->idx_pos_v=video_chunk_pos;
 752             priv->idx_pos=(audio_chunk_pos<video_chunk_pos)?audio_chunk_pos:video_chunk_pos;
 753         }
 754
 755           mp_msg(MSGT_SEEK,MSGL_V,"SEEK: idx=%d  (a:%d v:%d)  v.skip=%d  a.skip=%d/%4.3f  \n",
 756             (int)priv->idx_pos,audio_chunk_pos,video_chunk_pos,
 757             (int)priv->skip_video_frames,skip_audio_bytes,skip_audio_secs);
 758
 759           if(skip_audio_bytes){
 760             demux_read_data(d_audio,NULL,skip_audio_bytes);
 761           }
 762
 763       }
 764         d_video->pts=priv->avi_video_pts; // OSD
 765
 766 }
 767
 768
 769 static void demux_close_avi(demuxer_t *demuxer) {
 770   avi_priv_t* priv=demuxer->priv;
 771
 772   if(!priv)
 773     return;
 774
 775   if(priv->idx_size > 0)
 776     free(priv->idx);
 777   free(priv);
 778 }
 779
 780
 781 static int demux_avi_control(demuxer_t *demuxer,int cmd, void *arg){
 782     avi_priv_t *priv=demuxer->priv;
 783     demux_stream_t *d_video=demuxer->video;
 784     sh_video_t *sh_video=d_video->sh;
 785
 786     switch(cmd) {
 787         case DEMUXER_CTRL_GET_TIME_LENGTH:
 788             if (!priv->numberofframes || !sh_video) return DEMUXER_CTRL_DONTKNOW;
 789             *((double *)arg)=(double)priv->numberofframes/sh_video->fps;
 790             if (sh_video->video.dwLength<=1) return DEMUXER_CTRL_GUESS;
 791             return DEMUXER_CTRL_OK;
 792
 793         case DEMUXER_CTRL_GET_PERCENT_POS:
 794             if (!priv->numberofframes || !sh_video) {
 795               return DEMUXER_CTRL_DONTKNOW;
 796             }
 797             *((int *)arg)=(int)(priv->video_pack_no*100/priv->numberofframes);
 798             if (sh_video->video.dwLength<=1) return DEMUXER_CTRL_GUESS;
 799             return DEMUXER_CTRL_OK;
 800
 801         case DEMUXER_CTRL_SWITCH_AUDIO:
 802         case DEMUXER_CTRL_SWITCH_VIDEO: {
 803             int audio = (cmd == DEMUXER_CTRL_SWITCH_AUDIO);
 804             demux_stream_t *ds = audio ? demuxer->audio : demuxer->video;
 805             void **streams = audio ? demuxer->a_streams : demuxer->v_streams;
 806             int maxid = FFMIN(100, audio ? MAX_A_STREAMS : MAX_V_STREAMS);
 807             int chunkid;
 808             if (ds->id < -1)
 809               return DEMUXER_CTRL_NOTIMPL;
 810
 811             if (*(int *)arg >= 0)
 812               ds->id = *(int *)arg;
 813             else {
 814               int i;
 815               for (i = 0; i < maxid; i++) {
 816                 if (++ds->id >= maxid) ds->id = 0;
 817                 if (streams[ds->id]) break;
 818               }
 819             }
 820
 821             chunkid = (ds->id / 10 + '0') | (ds->id % 10 + '0') << 8;
 822             ds->sh = NULL;
 823             if (!streams[ds->id]) // stream not available
 824               ds->id = -1;
 825             else
 826               demux_avi_select_stream(demuxer, chunkid);
 827             *(int *)arg = ds->id;
 828             return DEMUXER_CTRL_OK;
 829         }
 830
 831         default:
 832             return DEMUXER_CTRL_NOTIMPL;
 833     }
 834 }
 835
 836
 837 static int avi_check_file(demuxer_t *demuxer)
 838 {
 839   int id=stream_read_dword_le(demuxer->stream); // "RIFF"
 840
 841   if((id==mmioFOURCC('R','I','F','F')) || (id==mmioFOURCC('O','N','2',' '))) {
 842     stream_read_dword_le(demuxer->stream); //filesize
 843     id=stream_read_dword_le(demuxer->stream); // "AVI "
 844     if(id==formtypeAVI)
 845       return DEMUXER_TYPE_AVI;
 846     // "Samsung Digimax i6 PMP" crap according to bug 742
 847     if(id==mmioFOURCC('A','V','I',0x19))
 848       return DEMUXER_TYPE_AVI;
 849     if(id==mmioFOURCC('O','N','2','f')){
 850       mp_tmsg(MSGT_DEMUXER,MSGL_INFO,"ON2 AVI format");
 851       return DEMUXER_TYPE_AVI;
 852     }
 853   }
 854
 855   return 0;
 856 }
 857
 858
 859 static demuxer_t* demux_open_hack_avi(demuxer_t *demuxer)
 860 {
 861    struct MPOpts *opts = demuxer->opts;
 862    sh_audio_t* sh_a;
 863
 864    demuxer = demux_open_avi(demuxer);
 865    if(!demuxer) return NULL; // failed to open
 866    sh_a = demuxer->audio->sh;
 867    if(demuxer->audio->id != -2 && sh_a) {
 868 #ifdef CONFIG_OGGVORBIS
 869     // support for Ogg-in-AVI:
 870     if(sh_a->format == 0xFFFE)
 871       demuxer = init_avi_with_ogg(demuxer);
 872     else if(sh_a->format == 0x674F) {
 873       stream_t* s;
 874       demuxer_t  *od;
 875       s = new_ds_stream(demuxer->audio);
 876       od = new_demuxer(opts, s,DEMUXER_TYPE_OGG,-1,-2,-2,NULL);
 877       if(!demux_ogg_open(od)) {
 878         mp_tmsg( MSGT_DEMUXER,MSGL_ERR,"Unable to open the Ogg demuxer.\n");
 879         free_stream(s);
 880         demuxer->audio->id = -2;
 881       } else
 882         demuxer = new_demuxers_demuxer(demuxer,od,demuxer);
 883    }
 884 #endif
 885    }
 886
 887    return demuxer;
 888 }
 889
 890
 891 const demuxer_desc_t demuxer_desc_avi = {
 892   "AVI demuxer",
 893   "avi",
 894   "AVI",
 895   "Arpi?",
 896   "AVI files, including non interleaved files",
 897   DEMUXER_TYPE_AVI,
 898   1, // safe autodetect
 899   avi_check_file,
 900   demux_avi_fill_buffer,
 901   demux_open_hack_avi,
 902   demux_close_avi,
 903   demux_seek_avi,
 904   demux_avi_control
 905 };
 906
 907 const demuxer_desc_t demuxer_desc_avi_ni = {
 908   "AVI demuxer, non-interleaved",
 909   "avini",
 910   "AVI",
 911   "Arpi?",
 912   "AVI files, including non interleaved files",
 913   DEMUXER_TYPE_AVI,
 914   1, // safe autodetect
 915   avi_check_file,
 916   demux_avi_fill_buffer_ni,
 917   demux_open_hack_avi,
 918   demux_close_avi,
 919   demux_seek_avi,
 920   demux_avi_control
 921 };
 922
 923 const demuxer_desc_t demuxer_desc_avi_nini = {
 924   "AVI demuxer, non-interleaved and no index",
 925   "avinini",
 926   "AVI",
 927   "Arpi?",
 928   "AVI files, including non interleaved files",
 929   DEMUXER_TYPE_AVI,
 930   1, // safe autodetect
 931   avi_check_file,
 932   demux_avi_fill_buffer_nini,
 933   demux_open_hack_avi,
 934   demux_close_avi,
 935   demux_seek_avi,
 936   demux_avi_control
 937 };