libmpdemux/demux_asf.c

   1 /*
   2  * ASF file parser for DEMUXER v0.3
   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 #include <limits.h>
  26
  27 #include "config.h"
  28 #include "mp_msg.h"
  29
  30 #include "stream/stream.h"
  31 #include "asf.h"
  32 #include "asfheader.h"
  33 #include "demuxer.h"
  34 #include "libmpcodecs/dec_audio.h"
  35 #include "libvo/fastmemcpy.h"
  36 #include "ffmpeg_files/intreadwrite.h"
  37
  38 // based on asf file-format doc by Eugene [http://divx.euro.ru]
  39
  40 /**
  41  * \brief reads int stored in number of bytes given by len
  42  * \param ptr pointer to read from, is incremented appropriately
  43  * \param len lowest 2 bits indicate number of bytes to read
  44  * \param def default value to return if len is invalid
  45  */
  46 static inline unsigned read_varlen(uint8_t **ptr, int len, int def) {
  47     const uint8_t *p = *ptr;
  48     len &= 3;
  49     switch (len) {
  50       case 1: *ptr += 1; return *p;
  51       case 2: *ptr += 2; return AV_RL16(p);
  52       case 3: *ptr += 4; return AV_RL32(p);
  53     }
  54     return def;
  55 }
  56
  57 /**
  58  * \brief checks if there is enough data to read the bytes given by len
  59  * \param ptr pointer to read from
  60  * \param endptr pointer to the end of the buffer
  61  * \param len lowest 2 bits indicate number of bytes to read
  62  */
  63 static inline int check_varlen(uint8_t *ptr, uint8_t *endptr, int len) {
  64     return len&3 ? ptr + (1<<((len&3) - 1)) <= endptr : 1;
  65 }
  66
  67 static void asf_descrambling(unsigned char **src,unsigned len, struct asf_priv* asf){
  68   unsigned char *dst;
  69   unsigned char *s2=*src;
  70   unsigned i=0,x,y;
  71   if (len > UINT_MAX - MP_INPUT_BUFFER_PADDING_SIZE)
  72         return;
  73   dst = malloc(len + MP_INPUT_BUFFER_PADDING_SIZE);
  74   while(len>=asf->scrambling_h*asf->scrambling_w*asf->scrambling_b+i){
  75 //    mp_msg(MSGT_DEMUX,MSGL_DBG4,"descrambling! (w=%d  b=%d)\n",w,asf_scrambling_b);
  76         //i+=asf_scrambling_h*asf_scrambling_w;
  77         for(x=0;x<asf->scrambling_w;x++)
  78           for(y=0;y<asf->scrambling_h;y++){
  79             fast_memcpy(dst+i,s2+(y*asf->scrambling_w+x)*asf->scrambling_b,asf->scrambling_b);
  80                 i+=asf->scrambling_b;
  81           }
  82         s2+=asf->scrambling_h*asf->scrambling_w*asf->scrambling_b;
  83   }
  84   //if(i<len) fast_memcpy(dst+i,src+i,len-i);
  85   free(*src);
  86   *src = dst;
  87 }
  88
  89 /*****************************************************************
  90  * \brief initializes asf private data
  91  *
  92  */
  93 static void init_priv (struct asf_priv* asf){
  94   asf->last_vid_seq=-1;
  95   asf->vid_ext_timing_index=-1;
  96   asf->aud_ext_timing_index=-1;
  97   asf->vid_ext_frame_index=-1;
  98 }
  99
 100 static void demux_asf_append_to_packet(demux_packet_t* dp,unsigned char *data,int len,int offs)
 101 {
 102   if(dp->len!=offs && offs!=-1) mp_msg(MSGT_DEMUX,MSGL_V,"warning! fragment.len=%d BUT next fragment offset=%d  \n",dp->len,offs);
 103   dp->buffer=realloc(dp->buffer,dp->len+len+MP_INPUT_BUFFER_PADDING_SIZE);
 104   fast_memcpy(dp->buffer+dp->len,data,len);
 105   memset(dp->buffer+dp->len+len, 0, MP_INPUT_BUFFER_PADDING_SIZE);
 106   mp_dbg(MSGT_DEMUX,MSGL_DBG4,"data appended! %d+%d\n",dp->len,len);
 107   dp->len+=len;
 108 }
 109
 110 static int demux_asf_read_packet(demuxer_t *demux,unsigned char *data,int len,int id,int seq,uint64_t time,unsigned short dur,int offs,int keyframe){
 111   struct asf_priv* asf = demux->priv;
 112   demux_stream_t *ds=NULL;
 113   int close_seg=0;
 114
 115   mp_dbg(MSGT_DEMUX,MSGL_DBG4,"demux_asf.read_packet: id=%d seq=%d len=%d\n",id,seq,len);
 116
 117   if(demux->video->id==-1)
 118     if(demux->v_streams[id])
 119         demux->video->id=id;
 120
 121   if(demux->audio->id==-1)
 122     if(demux->a_streams[id])
 123         demux->audio->id=id;
 124
 125   if(id==demux->audio->id){
 126       // audio
 127       ds=demux->audio;
 128       if(!ds->sh){
 129         ds->sh=demux->a_streams[id];
 130         mp_msg(MSGT_DEMUX,MSGL_V,"Auto-selected ASF audio ID = %d\n",ds->id);
 131       }
 132   } else
 133   if(id==demux->video->id){
 134       // video
 135       ds=demux->video;
 136       if(!ds->sh){
 137         ds->sh=demux->v_streams[id];
 138         mp_msg(MSGT_DEMUX,MSGL_V,"Auto-selected ASF video ID = %d\n",ds->id);
 139       }
 140   }
 141
 142   if(ds){
 143     if(ds->asf_packet){
 144       demux_packet_t* dp=ds->asf_packet;
 145
 146       if (ds==demux->video && asf->asf_is_dvr_ms) {
 147         if (asf->new_vid_frame_seg) {
 148           dp->pos=demux->filepos;
 149           close_seg = 1;
 150         } else seq = ds->asf_seq;
 151       } else close_seg = ds->asf_seq!=seq;
 152
 153       if(close_seg){
 154         // closed segment, finalize packet:
 155                 if(ds==demux->audio)
 156                   if(asf->scrambling_h>1 && asf->scrambling_w>1 && asf->scrambling_b>0)
 157                     asf_descrambling(&ds->asf_packet->buffer,ds->asf_packet->len,asf);
 158         ds_add_packet(ds,ds->asf_packet);
 159         ds->asf_packet=NULL;
 160       } else {
 161         // append data to it!
 162         demux_asf_append_to_packet(dp,data,len,offs);
 163         // we are ready now.
 164         return 1;
 165       }
 166     }
 167     // create new packet:
 168     { demux_packet_t* dp;
 169       if(offs>0){
 170         mp_msg(MSGT_DEMUX,MSGL_V,"warning!  broken fragment, %d bytes missing  \n",offs);
 171         return 0;
 172       }
 173       dp=new_demux_packet(len);
 174       fast_memcpy(dp->buffer,data,len);
 175       if (asf->asf_is_dvr_ms)
 176         dp->pts=time*0.0000001;
 177       else
 178         dp->pts=time*0.001;
 179       dp->flags=keyframe;
 180 //      if(ds==demux->video) printf("ASF time: %8d  dur: %5d  \n",time,dur);
 181       dp->pos=demux->filepos;
 182       ds->asf_packet=dp;
 183       ds->asf_seq=seq;
 184       // we are ready now.
 185       return 1;
 186     }
 187   }
 188
 189   return 0;
 190 }
 191
 192 /*****************************************************************
 193  * \brief read the replicated data associated with each segment
 194  * \parameter pp reference to replicated data
 195  * \parameter id stream number
 196  * \parameter seq media object number
 197  * \parameter keyframe key frame indicator - set to zero if keyframe, non-zero otherwise
 198  * \parameter seg_time set to payload time when valid, if audio or new video frame payload, zero otherwise
 199  *
 200  */
 201 static void get_payload_extension_data(demuxer_t *demux, unsigned char** pp, unsigned char id, unsigned int seq, int *keyframe, uint64_t *seg_time){
 202     struct asf_priv* asf = demux->priv;
 203     uint64_t payload_time; //100ns units
 204     int i, ext_max, ext_timing_index;
 205     uint8_t *pi = *pp+4;
 206
 207     if(demux->video->id==-1)
 208         if(demux->v_streams[id])
 209             demux->video->id=id;
 210
 211     if(demux->audio->id==-1)
 212         if(demux->a_streams[id])
 213             demux->audio->id=id;
 214
 215     if (id!=demux->video->id && id!=demux->audio->id) return;
 216
 217     if (id==demux->video->id) {
 218       ext_max = asf->vid_repdata_count;
 219       ext_timing_index = asf->vid_ext_timing_index;
 220     } else {
 221       ext_max = asf->aud_repdata_count;
 222       ext_timing_index = asf->aud_ext_timing_index;
 223     }
 224
 225     *seg_time=0.0;
 226     asf->new_vid_frame_seg = 0;
 227
 228     for (i=0; i<ext_max; i++) {
 229         uint16_t payextsize;
 230         uint8_t segment_marker;
 231
 232         if (id==demux->video->id)
 233             payextsize = asf->vid_repdata_sizes[i];
 234         else
 235             payextsize = asf->aud_repdata_sizes[i];
 236
 237         if (payextsize == 65535) {
 238             payextsize = AV_RL16(pi);
 239             pi+=2;
 240         }
 241
 242         // if this is the timing info extension then read the payload time
 243         if (i == ext_timing_index)
 244             payload_time = AV_RL64(pi+8);
 245
 246         // if this is the video frame info extension then
 247         // set the keyframe indicator, the 'new frame segment' indicator
 248         // and (initially) the 'frame time'
 249         if (i == asf->vid_ext_frame_index && id==demux->video->id) {
 250             segment_marker = pi[0];
 251             // Known video stream segment_marker values that
 252             // contain useful information:
 253             //
 254             // NTSC/ATSC (29.97fps):        0X4A 01001010
 255             //                              0X4B 01001011
 256             //                              0X49 01001001
 257             //
 258             // PAL/ATSC (25fps):            0X3A 00111010
 259             //                              0X3B 00111011
 260             //                              0X39 00111001
 261             //
 262             // ATSC progressive (29.97fps): 0X7A 01111010
 263             //                              0X7B 01111011
 264             //                              0X79 01111001
 265             //   11111111
 266             //       ^    this is new video frame marker
 267             //
 268             //   ^^^^     these bits indicate the framerate
 269             //            0X4 is 29.97i, 0X3 is 25i, 0X7 is 29.97p, ???=25p
 270             //
 271             //        ^^^ these bits indicate the frame type:
 272             //              001 means I-frame
 273             //              010 and 011 probably mean P and B
 274
 275             asf->new_vid_frame_seg = (0X08 & segment_marker) && seq != asf->last_vid_seq;
 276
 277             if (asf->new_vid_frame_seg) asf->last_vid_seq = seq;
 278
 279             if (asf->avg_vid_frame_time == 0) {
 280                 // set the average frame time initially (in 100ns units).
 281                 // This is based on what works for known samples.
 282                 // It can be extended if more samples of different types can be obtained.
 283                 if (((segment_marker & 0XF0) >> 4) == 4) {
 284                     asf->avg_vid_frame_time = (uint64_t)((1.001 / 30.0) * 10000000.0);
 285                     asf->know_frame_time=1;
 286                 } else if (((segment_marker & 0XF0) >> 4) == 3) {
 287                     asf->avg_vid_frame_time = (uint64_t)(0.04 * 10000000.0);
 288                     asf->know_frame_time=1;
 289                 } else if (((segment_marker & 0XF0) >> 4) == 6) {
 290                     asf->avg_vid_frame_time = (uint64_t)(0.02 * 10000000.0);
 291                     asf->know_frame_time=1;
 292                 } else if (((segment_marker & 0XF0) >> 4) == 7) {
 293                     asf->avg_vid_frame_time = (uint64_t)((1.001 / 60.0) * 10000000.0);
 294                     asf->know_frame_time=1;
 295                 } else {
 296                     // we dont know the frame time initially so
 297                     // make a guess and then recalculate as we go.
 298                     asf->avg_vid_frame_time = (uint64_t)((1.001 / 60.0) * 10000000.0);
 299                     asf->know_frame_time=0;
 300                 }
 301             }
 302             *keyframe = (asf->new_vid_frame_seg && (segment_marker & 0X07) == 1);
 303         }
 304         pi +=payextsize;
 305     }
 306
 307     if (id==demux->video->id && asf->new_vid_frame_seg) {
 308         asf->vid_frame_ct++;
 309         // Some samples only have timings on key frames and
 310         // the rest contain non-cronological timestamps. Interpolating
 311         // the values between key frames works for all samples.
 312         if (*keyframe) {
 313             asf->found_first_key_frame=1;
 314             if (!asf->know_frame_time && asf->last_key_payload_time > 0) {
 315                 // We dont know average frametime so recalculate.
 316                 // Giving precedence to the 'weight' of the existing
 317                 // average limits damage done to new value when there is
 318                 // a sudden time jump which happens occasionally.
 319                 asf->avg_vid_frame_time =
 320                    (0.9 * asf->avg_vid_frame_time) +
 321                    (0.1 * ((payload_time - asf->last_key_payload_time) / asf->vid_frame_ct));
 322             }
 323             asf->last_key_payload_time = payload_time;
 324             asf->vid_frame_ct = 1;
 325             *seg_time = payload_time;
 326         } else
 327             *seg_time = (asf->last_key_payload_time  + (asf->avg_vid_frame_time * (asf->vid_frame_ct-1)));
 328     }
 329
 330     if (id==demux->audio->id) {
 331         if (payload_time != -1)
 332             asf->last_aud_diff = payload_time - asf->last_aud_pts;
 333         asf->last_aud_pts += asf->last_aud_diff;
 334         *seg_time = asf->last_aud_pts;
 335    }
 336 }
 337 //static int num_elementary_packets100=0;
 338 //static int num_elementary_packets101=0;
 339
 340 // return value:
 341 //     0 = EOF or no stream found
 342 //     1 = successfully read a packet
 343 static int demux_asf_fill_buffer(demuxer_t *demux, demux_stream_t *ds){
 344   struct asf_priv* asf = demux->priv;
 345
 346   demux->filepos=stream_tell(demux->stream);
 347   // Brodcast stream have movi_start==movi_end
 348   // Better test ?
 349   if((demux->movi_start < demux->movi_end) && (demux->filepos>=demux->movi_end)){
 350           demux->stream->eof=1;
 351           return 0;
 352   }
 353
 354     stream_read(demux->stream,asf->packet,asf->packetsize);
 355     if(demux->stream->eof) return 0; // EOF
 356     if(asf->packetsize < 2) return 0; // Packet too short
 357
 358     {
 359             unsigned char* p=asf->packet;
 360             unsigned char* p_end=asf->packet+asf->packetsize;
 361             unsigned char flags=p[0];
 362             unsigned char segtype=p[1];
 363             unsigned padding;
 364             unsigned plen;
 365             unsigned sequence;
 366             unsigned long time=0;
 367             unsigned short duration=0;
 368
 369             int segs=1;
 370             unsigned char segsizetype=0x80;
 371             int seg=-1;
 372
 373             if( mp_msg_test(MSGT_DEMUX,MSGL_DBG2) ){
 374                 int i;
 375                 for(i=0;i<FFMIN(16, asf->packetsize);i++) printf(" %02X",asf->packet[i]);
 376                 printf("\n");
 377             }
 378
 379             // skip ECC data if present by testing bit 7 of flags
 380             // 1xxxbbbb -> ecc data present, skip bbbb byte(s)
 381             // 0xxxxxxx -> payload parsing info starts
 382             if (flags & 0x80)
 383             {
 384                 p += (flags & 0x0f)+1;
 385                 if (p+1 >= p_end) return 0; // Packet too short
 386                 flags = p[0];
 387                 segtype = p[1];
 388             }
 389
 390             //if(segtype!=0x5d) printf("Warning! packet[4] != 0x5d  \n");
 391
 392             p+=2; // skip flags & segtype
 393
 394             // Read packet size (plen):
 395             if(!check_varlen(p, p_end, flags>> 5)) return 0; // Not enough data
 396             plen = read_varlen(&p, flags >> 5, 0);
 397
 398             // Read sequence:
 399             if(!check_varlen(p, p_end, flags>> 1)) return 0; // Not enough data
 400             sequence = read_varlen(&p, flags >> 1, 0);
 401
 402             // Read padding size (padding):
 403             if(!check_varlen(p, p_end, flags>> 3)) return 0; // Not enough data
 404             padding = read_varlen(&p, flags >> 3, 0);
 405
 406             if(((flags>>5)&3)!=0){
 407               // Explicit (absoulte) packet size
 408               mp_dbg(MSGT_DEMUX,MSGL_DBG2,"Explicit packet size specified: %d  \n",plen);
 409               if(plen>asf->packetsize) mp_msg(MSGT_DEMUX,MSGL_V,"Warning! plen>packetsize! (%d>%d)  \n",plen,asf->packetsize);
 410             } else {
 411               // Padding (relative) size
 412               plen=asf->packetsize-padding;
 413             }
 414
 415             // Read time & duration:
 416             if (p+5 >= p_end) return 0; // Packet too short
 417             time = AV_RL32(p); p+=4;
 418             duration = AV_RL16(p); p+=2;
 419
 420             // Read payload flags:
 421             if(flags&1){
 422               // multiple sub-packets
 423               if (p >= p_end) return 0; // Packet too short
 424               segsizetype=p[0]>>6;
 425               segs=p[0] & 0x3F;
 426               ++p;
 427             }
 428             mp_dbg(MSGT_DEMUX,MSGL_DBG4,"%08"PRIu64":  flag=%02X  segs=%d  seq=%u  plen=%u  pad=%u  time=%ld  dur=%d\n",
 429               (uint64_t)demux->filepos,flags,segs,sequence,plen,padding,time,duration);
 430
 431             for(seg=0;seg<segs;seg++){
 432               //ASF_segmhdr_t* sh;
 433               unsigned char streamno;
 434               unsigned int seq;
 435               unsigned int x;   // offset or timestamp
 436               unsigned int rlen;
 437               //
 438               int len;
 439               uint64_t time2=0;
 440               int keyframe=0;
 441
 442               if(p>=p_end) {
 443                 mp_msg(MSGT_DEMUX,MSGL_V,"Warning! invalid packet 1, aborting parsing...\n");
 444                 break;
 445               }
 446
 447               if( mp_msg_test(MSGT_DEMUX,MSGL_DBG2) ){
 448                 int i;
 449                 printf("seg %d:",seg);
 450                 for(i=0;i<FFMIN(16, p_end - p);i++) printf(" %02X",p[i]);
 451                 printf("\n");
 452               }
 453
 454               streamno=p[0]&0x7F;
 455               if(p[0]&0x80) keyframe=1;
 456               p++;
 457
 458               // Read media object number (seq):
 459               if(!check_varlen(p, p_end, segtype >> 4)) break; // Not enough data
 460               seq = read_varlen(&p, segtype >> 4, 0);
 461
 462               // Read offset or timestamp:
 463               if(!check_varlen(p, p_end, segtype >> 2)) break; // Not enough data
 464               x = read_varlen(&p, segtype >> 2, 0);
 465
 466               // Read replic.data len:
 467               if(!check_varlen(p, p_end, segtype)) break; // Not enough data
 468               rlen = read_varlen(&p, segtype, 0);
 469
 470 //            printf("### rlen=%d   \n",rlen);
 471               if (rlen < 0 || rlen > p_end - p) {
 472                 mp_msg(MSGT_DEMUX, MSGL_V, "invalid rlen=%d\n", rlen);
 473                 break;
 474               }
 475
 476               switch(rlen){
 477               case 0x01: // 1 = special, means grouping
 478                 //printf("grouping: %02X  \n",p[0]);
 479                 ++p; // skip PTS delta
 480                 break;
 481               default:
 482                 if(rlen>=8){
 483                     p+=4;       // skip object size
 484                     if (p+3 >= p_end) break; // Packet too short
 485                     time2=AV_RL32(p); // read PTS
 486                     if (asf->asf_is_dvr_ms)
 487                         get_payload_extension_data(demux, &p, streamno, seq, &keyframe, &time2);
 488                     p+=rlen-4;
 489                 } else {
 490                     mp_msg(MSGT_DEMUX,MSGL_V,"unknown segment type (rlen): 0x%02X  \n",rlen);
 491                     time2=0; // unknown
 492                     p+=rlen;
 493                 }
 494               }
 495
 496               if(flags&1){
 497                 // multiple segments
 498                 if(!check_varlen(p, p_end, segsizetype)) break; // Not enough data
 499                 len = read_varlen(&p, segsizetype, plen-(p-asf->packet));
 500               } else {
 501                 // single segment
 502                 len=plen-(p-asf->packet);
 503               }
 504               if(len<0 || (p+len)>p_end){
 505                 mp_msg(MSGT_DEMUX,MSGL_V,"ASF_parser: warning! segment len=%d\n",len);
 506                 len = p_end - p;
 507               }
 508               mp_dbg(MSGT_DEMUX,MSGL_DBG4,"  seg #%d: streamno=%d  seq=%d  type=%02X  len=%d\n",seg,streamno,seq,rlen,len);
 509
 510               switch(rlen){
 511               case 0x01:
 512                 // GROUPING:
 513                 //printf("ASF_parser: warning! grouping (flag=1) not yet supported!\n",len);
 514                 //printf("  total: %d  \n",len);
 515                 while(len>0){
 516                   int len2=p[0];
 517                   p++;
 518                   //printf("  group part: %d bytes\n",len2);
 519                   if(len2 > len - 1 || len2 < 0) break; // Not enough data
 520                   len2 = FFMIN(len2, asf->packetsize);
 521                   demux_asf_read_packet(demux,p,len2,streamno,seq,x,duration,-1,keyframe);
 522                   p+=len2;
 523                   len-=len2+1;
 524                   ++seq;
 525                 }
 526                 if(len!=0){
 527                   mp_msg(MSGT_DEMUX,MSGL_V,"ASF_parser: warning! groups total != len\n");
 528                 }
 529                 break;
 530               default:
 531                 // NO GROUPING:
 532                 //printf("fragment offset: %d  \n",sh->x);
 533                 if (len <= 0) break;
 534                 if (!asf->asf_is_dvr_ms || asf->found_first_key_frame) {
 535                     len = FFMIN(len, asf->packetsize);
 536                     demux_asf_read_packet(demux,p,len,streamno,seq,time2,duration,x,keyframe);
 537                 }
 538                 p+=len;
 539                 break;
 540               }
 541
 542             } // for segs
 543             return 1; // success
 544     }
 545
 546     mp_msg(MSGT_DEMUX,MSGL_V,"%08"PRIX64":  UNKNOWN TYPE  %02X %02X %02X %02X %02X...\n",(int64_t)demux->filepos,asf->packet[0],asf->packet[1],asf->packet[2],asf->packet[3],asf->packet[4]);
 547     return 0;
 548 }
 549
 550 #include "stheader.h"
 551
 552 static void demux_seek_asf(demuxer_t *demuxer,float rel_seek_secs,float audio_delay,int flags){
 553     struct asf_priv* asf = demuxer->priv;
 554     demux_stream_t *d_audio=demuxer->audio;
 555     demux_stream_t *d_video=demuxer->video;
 556     sh_audio_t *sh_audio=d_audio->sh;
 557 //    sh_video_t *sh_video=d_video->sh;
 558
 559   //FIXME: OFF_T - didn't test ASF case yet (don't have a large asf...)
 560   //FIXME: reports good or bad to steve@daviesfam.org please
 561
 562   //================= seek in ASF ==========================
 563     float p_rate=asf->packetrate; // packets / sec
 564     off_t rel_seek_packs=(flags&SEEK_FACTOR)?    // FIXME: int may be enough?
 565         (rel_seek_secs*(demuxer->movi_end-demuxer->movi_start)/asf->packetsize):
 566         (rel_seek_secs*p_rate);
 567     off_t rel_seek_bytes=rel_seek_packs*asf->packetsize;
 568     off_t newpos;
 569     //printf("ASF: packs: %d  duration: %d  \n",(int)fileh.packets,*((int*)&fileh.duration));
 570 //    printf("ASF_seek: %d secs -> %d packs -> %d bytes  \n",
 571 //       rel_seek_secs,rel_seek_packs,rel_seek_bytes);
 572     newpos=((flags&SEEK_ABSOLUTE)?demuxer->movi_start:demuxer->filepos)+rel_seek_bytes;
 573     if(newpos<0 || newpos<demuxer->movi_start) newpos=demuxer->movi_start;
 574 //    printf("\r -- asf: newpos=%d -- \n",newpos);
 575     stream_seek(demuxer->stream,newpos);
 576
 577     if (asf->asf_is_dvr_ms) asf->dvr_last_vid_pts = 0.0f;
 578
 579     if (d_video->id >= 0)
 580     ds_fill_buffer(d_video);
 581     if(sh_audio){
 582       ds_fill_buffer(d_audio);
 583     }
 584
 585     if (d_video->id >= 0)
 586     while(1){
 587         if(sh_audio && !d_audio->eof){
 588           float a_pts=d_audio->pts;
 589           a_pts+=(ds_tell_pts(d_audio)-sh_audio->a_in_buffer_len)/(float)sh_audio->i_bps;
 590           // sync audio:
 591           if (d_video->pts > a_pts){
 592               skip_audio_frame(sh_audio);
 593 //            if(!ds_fill_buffer(d_audio)) sh_audio=NULL; // skip audio. EOF?
 594               continue;
 595           }
 596         }
 597         if(d_video->flags&1) break; // found a keyframe!
 598         if(!ds_fill_buffer(d_video)) break; // skip frame.  EOF?
 599     }
 600
 601
 602 }
 603
 604 static int demux_asf_control(demuxer_t *demuxer,int cmd, void *arg){
 605     struct asf_priv* asf = demuxer->priv;
 606 /*  demux_stream_t *d_audio=demuxer->audio;
 607     demux_stream_t *d_video=demuxer->video;
 608     sh_audio_t *sh_audio=d_audio->sh;
 609     sh_video_t *sh_video=d_video->sh;
 610 */
 611     switch(cmd) {
 612         case DEMUXER_CTRL_GET_TIME_LENGTH:
 613             *((double *)arg)=asf->movielength;
 614             return DEMUXER_CTRL_OK;
 615
 616         case DEMUXER_CTRL_GET_PERCENT_POS:
 617                 return DEMUXER_CTRL_DONTKNOW;
 618
 619         default:
 620             return DEMUXER_CTRL_NOTIMPL;
 621     }
 622 }
 623
 624
 625 static demuxer_t* demux_open_asf(demuxer_t* demuxer)
 626 {
 627     struct asf_priv* asf = demuxer->priv;
 628     sh_video_t *sh_video=NULL;
 629
 630     //---- ASF header:
 631     if(!asf) return NULL;
 632     init_priv(asf);
 633     if (!read_asf_header(demuxer,asf))
 634         return NULL;
 635     stream_reset(demuxer->stream);
 636     stream_seek(demuxer->stream,demuxer->movi_start);
 637 //    demuxer->idx_pos=0;
 638 //    demuxer->endpos=avi_header.movi_end;
 639     if(demuxer->video->id != -2) {
 640         if(!ds_fill_buffer(demuxer->video)){
 641             mp_msg(MSGT_DEMUXER, MSGL_WARN, "ASF: %s",
 642                    mp_gtext("No video stream found.\n"));
 643             demuxer->video->sh=NULL;
 644             //printf("ASF: missing video stream!? contact the author, it may be a bug :(\n");
 645         } else {
 646             sh_video=demuxer->video->sh;
 647             sh_video->fps=1000.0f; sh_video->frametime=0.001f;
 648
 649             if (asf->asf_is_dvr_ms) {
 650                 sh_video->bih->biWidth = 0;
 651                 sh_video->bih->biHeight = 0;
 652             }
 653         }
 654     }
 655
 656     if(demuxer->audio->id!=-2){
 657         mp_tmsg(MSGT_DEMUXER,MSGL_V,"ASF: Searching for audio stream (id:%d).\n",demuxer->audio->id);
 658         if(!ds_fill_buffer(demuxer->audio)){
 659             mp_msg(MSGT_DEMUXER, MSGL_INFO, "ASF: %s",
 660                    mp_gtext("No audio stream found -> no sound.\n"));
 661             demuxer->audio->sh=NULL;
 662         }
 663     }
 664     if(!demuxer->stream->seek)
 665         demuxer->seekable=0;
 666
 667     return demuxer;
 668 }
 669
 670
 671 static void demux_close_asf(demuxer_t *demuxer) {
 672     struct asf_priv* asf = demuxer->priv;
 673
 674     if (!asf) return;
 675
 676     free(asf->aud_repdata_sizes);
 677     free(asf->vid_repdata_sizes);
 678     free(asf->packet);
 679     free(asf);
 680 }
 681
 682 const demuxer_desc_t demuxer_desc_asf = {
 683   "ASF demuxer",
 684   "asf",
 685   "ASF",
 686   "A'rpi",
 687   "ASF, WMV, WMA",
 688   DEMUXER_TYPE_ASF,
 689   1, // safe autodetect
 690   asf_check_header,
 691   demux_asf_fill_buffer,
 692   demux_open_asf,
 693   demux_close_asf,
 694   demux_seek_asf,
 695   demux_asf_control
 696 };