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 #include "help_mp.h"
  30
  31 #include "stream/stream.h"
  32 #include "asf.h"
  33 #include "demuxer.h"
  34
  35 #include "libvo/fastmemcpy.h"
  36 #include "ffmpeg_files/intreadwrite.h"
  37
  38 // defined at asfheader.c:
  39
  40 int asf_check_header(demuxer_t *demuxer);
  41 int read_asf_header(demuxer_t *demuxer,struct asf_priv* asf);
  42
  43 // based on asf file-format doc by Eugene [http://divx.euro.ru]
  44
  45 /**
  46  * \brief reads int stored in number of bytes given by len
  47  * \param ptr pointer to read from, is incremented appropriately
  48  * \param len lowest 2 bits indicate number of bytes to read
  49  * \param def default value to return if len is invalid
  50  */
  51 static inline unsigned read_varlen(uint8_t **ptr, int len, int def) {
  52     const uint8_t *p = *ptr;
  53     len &= 3;
  54     switch (len) {
  55       case 1: *ptr += 1; return *p;
  56       case 2: *ptr += 2; return AV_RL16(p);
  57       case 3: *ptr += 4; return AV_RL32(p);
  58     }
  59     return def;
  60 }
  61
  62 /**
  63  * \brief checks if there is enough data to read the bytes given by len
  64  * \param ptr pointer to read from
  65  * \param endptr pointer to the end of the buffer
  66  * \param len lowest 2 bits indicate number of bytes to read
  67  */
  68 static inline int check_varlen(uint8_t *ptr, uint8_t *endptr, int len) {
  69     return len&3 ? ptr + (1<<((len&3) - 1)) <= endptr : 1;
  70 }
  71
  72 static void asf_descrambling(unsigned char **src,unsigned len, struct asf_priv* asf){
  73   unsigned char *dst;
  74   unsigned char *s2=*src;
  75   unsigned i=0,x,y;
  76   if (len > UINT_MAX - MP_INPUT_BUFFER_PADDING_SIZE)
  77         return;
  78   dst = malloc(len + MP_INPUT_BUFFER_PADDING_SIZE);
  79   while(len>=asf->scrambling_h*asf->scrambling_w*asf->scrambling_b+i){
  80 //    mp_msg(MSGT_DEMUX,MSGL_DBG4,"descrambling! (w=%d  b=%d)\n",w,asf_scrambling_b);
  81         //i+=asf_scrambling_h*asf_scrambling_w;
  82         for(x=0;x<asf->scrambling_w;x++)
  83           for(y=0;y<asf->scrambling_h;y++){
  84             fast_memcpy(dst+i,s2+(y*asf->scrambling_w+x)*asf->scrambling_b,asf->scrambling_b);
  85                 i+=asf->scrambling_b;
  86           }
  87         s2+=asf->scrambling_h*asf->scrambling_w*asf->scrambling_b;
  88   }
  89   //if(i<len) fast_memcpy(dst+i,src+i,len-i);
  90   free(*src);
  91   *src = dst;
  92 }
  93
  94 /*****************************************************************
  95  * \brief initializes asf private data
  96  *
  97  */
  98 static void init_priv (struct asf_priv* asf){
  99   asf->last_vid_seq=-1;
 100   asf->vid_ext_timing_index=-1;
 101   asf->aud_ext_timing_index=-1;
 102   asf->vid_ext_frame_index=-1;
 103 }
 104
 105 static void demux_asf_append_to_packet(demux_packet_t* dp,unsigned char *data,int len,int offs)
 106 {
 107   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);
 108   dp->buffer=realloc(dp->buffer,dp->len+len+MP_INPUT_BUFFER_PADDING_SIZE);
 109   fast_memcpy(dp->buffer+dp->len,data,len);
 110   memset(dp->buffer+dp->len+len, 0, MP_INPUT_BUFFER_PADDING_SIZE);
 111   mp_dbg(MSGT_DEMUX,MSGL_DBG4,"data appended! %d+%d\n",dp->len,len);
 112   dp->len+=len;
 113 }
 114
 115 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){
 116   struct asf_priv* asf = demux->priv;
 117   demux_stream_t *ds=NULL;
 118   int close_seg=0;
 119
 120   mp_dbg(MSGT_DEMUX,MSGL_DBG4,"demux_asf.read_packet: id=%d seq=%d len=%d\n",id,seq,len);
 121
 122   if(demux->video->id==-1)
 123     if(demux->v_streams[id])
 124         demux->video->id=id;
 125
 126   if(demux->audio->id==-1)
 127     if(demux->a_streams[id])
 128         demux->audio->id=id;
 129
 130   if(id==demux->audio->id){
 131       // audio
 132       ds=demux->audio;
 133       if(!ds->sh){
 134         ds->sh=demux->a_streams[id];
 135         mp_msg(MSGT_DEMUX,MSGL_V,"Auto-selected ASF audio ID = %d\n",ds->id);
 136       }
 137   } else
 138   if(id==demux->video->id){
 139       // video
 140       ds=demux->video;
 141       if(!ds->sh){
 142         ds->sh=demux->v_streams[id];
 143         mp_msg(MSGT_DEMUX,MSGL_V,"Auto-selected ASF video ID = %d\n",ds->id);
 144       }
 145   }
 146
 147   if(ds){
 148     if(ds->asf_packet){
 149       demux_packet_t* dp=ds->asf_packet;
 150
 151       if (ds==demux->video && asf->asf_is_dvr_ms) {
 152         if (asf->new_vid_frame_seg) {
 153           dp->pos=demux->filepos;
 154           close_seg = 1;
 155         } else seq = ds->asf_seq;
 156       } else close_seg = ds->asf_seq!=seq;
 157
 158       if(close_seg){
 159         // closed segment, finalize packet:
 160                 if(ds==demux->audio)
 161                   if(asf->scrambling_h>1 && asf->scrambling_w>1 && asf->scrambling_b>0)
 162                     asf_descrambling(&ds->asf_packet->buffer,ds->asf_packet->len,asf);
 163         ds_add_packet(ds,ds->asf_packet);
 164         ds->asf_packet=NULL;
 165       } else {
 166         // append data to it!
 167         demux_asf_append_to_packet(dp,data,len,offs);
 168         // we are ready now.
 169         return 1;
 170       }
 171     }
 172     // create new packet:
 173     { demux_packet_t* dp;
 174       if(offs>0){
 175         mp_msg(MSGT_DEMUX,MSGL_V,"warning!  broken fragment, %d bytes missing  \n",offs);
 176         return 0;
 177       }
 178       dp=new_demux_packet(len);
 179       fast_memcpy(dp->buffer,data,len);
 180       if (asf->asf_is_dvr_ms)
 181         dp->pts=time*0.0000001;
 182       else
 183         dp->pts=time*0.001;
 184       dp->flags=keyframe;
 185 //      if(ds==demux->video) printf("ASF time: %8d  dur: %5d  \n",time,dur);
 186       dp->pos=demux->filepos;
 187       ds->asf_packet=dp;
 188       ds->asf_seq=seq;
 189       // we are ready now.
 190       return 1;
 191     }
 192   }
 193
 194   return 0;
 195 }
 196
 197 /*****************************************************************
 198  * \brief read the replicated data associated with each segment
 199  * \parameter pp reference to replicated data
 200  * \parameter id stream number
 201  * \parameter seq media object number
 202  * \parameter keyframe key frame indicator - set to zero if keyframe, non-zero otherwise
 203  * \parameter seg_time set to payload time when valid, if audio or new video frame payload, zero otherwise
 204  *
 205  */
 206 static void get_payload_extension_data(demuxer_t *demux, unsigned char** pp, unsigned char id, unsigned int seq, int *keyframe, uint64_t *seg_time){
 207     struct asf_priv* asf = demux->priv;
 208     uint64_t payload_time; //100ns units
 209     int i, ext_max, ext_timing_index;
 210     uint8_t *pi = *pp+4;
 211
 212     if(demux->video->id==-1)
 213         if(demux->v_streams[id])
 214             demux->video->id=id;
 215
 216     if(demux->audio->id==-1)
 217         if(demux->a_streams[id])
 218             demux->audio->id=id;
 219
 220     if (id!=demux->video->id && id!=demux->audio->id) return;
 221
 222     if (id==demux->video->id) {
 223       ext_max = asf->vid_repdata_count;
 224       ext_timing_index = asf->vid_ext_timing_index;
 225     } else {
 226       ext_max = asf->aud_repdata_count;
 227       ext_timing_index = asf->aud_ext_timing_index;
 228     }
 229
 230     *seg_time=0.0;
 231     asf->new_vid_frame_seg = 0;
 232
 233     for (i=0; i<ext_max; i++) {
 234         uint16_t payextsize;
 235         uint8_t segment_marker;
 236
 237         if (id==demux->video->id)
 238             payextsize = asf->vid_repdata_sizes[i];
 239         else
 240             payextsize = asf->aud_repdata_sizes[i];
 241
 242         if (payextsize == 65535) {
 243             payextsize = AV_RL16(pi);
 244             pi+=2;
 245         }
 246
 247         // if this is the timing info extension then read the payload time
 248         if (i == ext_timing_index)
 249             payload_time = AV_RL64(pi+8);
 250
 251         // if this is the video frame info extension then
 252         // set the keyframe indicator, the 'new frame segment' indicator
 253         // and (initially) the 'frame time'
 254         if (i == asf->vid_ext_frame_index && id==demux->video->id) {
 255             segment_marker = pi[0];
 256             // Known video stream segment_marker values that
 257             // contain useful information:
 258             //
 259             // NTSC/ATSC (29.97fps):        0X4A 01001010
 260             //                              0X4B 01001011
 261             //                              0X49 01001001
 262             //
 263             // PAL/ATSC (25fps):            0X3A 00111010
 264             //                              0X3B 00111011
 265             //                              0X39 00111001
 266             //
 267             // ATSC progressive (29.97fps): 0X7A 01111010
 268             //                              0X7B 01111011
 269             //                              0X79 01111001
 270             //   11111111
 271             //       ^    this is new video frame marker
 272             //
 273             //   ^^^^     these bits indicate the framerate
 274             //            0X4 is 29.97i, 0X3 is 25i, 0X7 is 29.97p, ???=25p
 275             //
 276             //        ^^^ these bits indicate the frame type:
 277             //              001 means I-frame
 278             //              010 and 011 probably mean P and B
 279
 280             asf->new_vid_frame_seg = (0X08 & segment_marker) && seq != asf->last_vid_seq;
 281
 282             if (asf->new_vid_frame_seg) asf->last_vid_seq = seq;
 283
 284             if (asf->avg_vid_frame_time == 0) {
 285                 // set the average frame time initially (in 100ns units).
 286                 // This is based on what works for known samples.
 287                 // It can be extended if more samples of different types can be obtained.
 288                 if (((segment_marker & 0XF0) >> 4) == 4) {
 289                     asf->avg_vid_frame_time = (uint64_t)((1.001 / 30.0) * 10000000.0);
 290                     asf->know_frame_time=1;
 291                 } else if (((segment_marker & 0XF0) >> 4) == 3) {
 292                     asf->avg_vid_frame_time = (uint64_t)(0.04 * 10000000.0);
 293                     asf->know_frame_time=1;
 294                 } else if (((segment_marker & 0XF0) >> 4) == 6) {
 295                     asf->avg_vid_frame_time = (uint64_t)(0.02 * 10000000.0);
 296                     asf->know_frame_time=1;
 297                 } else if (((segment_marker & 0XF0) >> 4) == 7) {
 298                     asf->avg_vid_frame_time = (uint64_t)((1.001 / 60.0) * 10000000.0);
 299                     asf->know_frame_time=1;
 300                 } else {
 301                     // we dont know the frame time initially so
 302                     // make a guess and then recalculate as we go.
 303                     asf->avg_vid_frame_time = (uint64_t)((1.001 / 60.0) * 10000000.0);
 304                     asf->know_frame_time=0;
 305                 }
 306             }
 307             *keyframe = (asf->new_vid_frame_seg && (segment_marker & 0X07) == 1);
 308         }
 309         pi +=payextsize;
 310     }
 311
 312     if (id==demux->video->id && asf->new_vid_frame_seg) {
 313         asf->vid_frame_ct++;
 314         // Some samples only have timings on key frames and
 315         // the rest contain non-cronological timestamps. Interpolating
 316         // the values between key frames works for all samples.
 317         if (*keyframe) {
 318             asf->found_first_key_frame=1;
 319             if (!asf->know_frame_time && asf->last_key_payload_time > 0) {
 320                 // We dont know average frametime so recalculate.
 321                 // Giving precedence to the 'weight' of the existing
 322                 // average limits damage done to new value when there is
 323                 // a sudden time jump which happens occasionally.
 324                 asf->avg_vid_frame_time =
 325                    (0.9 * asf->avg_vid_frame_time) +
 326                    (0.1 * ((payload_time - asf->last_key_payload_time) / asf->vid_frame_ct));
 327             }
 328             asf->last_key_payload_time = payload_time;
 329             asf->vid_frame_ct = 1;
 330             *seg_time = payload_time;
 331         } else
 332             *seg_time = (asf->last_key_payload_time  + (asf->avg_vid_frame_time * (asf->vid_frame_ct-1)));
 333     }
 334
 335     if (id==demux->audio->id) {
 336         if (payload_time != -1)
 337             asf->last_aud_diff = payload_time - asf->last_aud_pts;
 338         asf->last_aud_pts += asf->last_aud_diff;
 339         *seg_time = asf->last_aud_pts;
 340    }
 341 }
 342 //static int num_elementary_packets100=0;
 343 //static int num_elementary_packets101=0;
 344
 345 // return value:
 346 //     0 = EOF or no stream found
 347 //     1 = successfully read a packet
 348 static int demux_asf_fill_buffer(demuxer_t *demux, demux_stream_t *ds){
 349   struct asf_priv* asf = demux->priv;
 350
 351   demux->filepos=stream_tell(demux->stream);
 352   // Brodcast stream have movi_start==movi_end
 353   // Better test ?
 354   if((demux->movi_start < demux->movi_end) && (demux->filepos>=demux->movi_end)){
 355           demux->stream->eof=1;
 356           return 0;
 357   }
 358
 359     stream_read(demux->stream,asf->packet,asf->packetsize);
 360     if(demux->stream->eof) return 0; // EOF
 361     if(asf->packetsize < 2) return 0; // Packet too short
 362
 363     {
 364             unsigned char* p=asf->packet;
 365             unsigned char* p_end=asf->packet+asf->packetsize;
 366             unsigned char flags=p[0];
 367             unsigned char segtype=p[1];
 368             unsigned padding;
 369             unsigned plen;
 370             unsigned sequence;
 371             unsigned long time=0;
 372             unsigned short duration=0;
 373
 374             int segs=1;
 375             unsigned char segsizetype=0x80;
 376             int seg=-1;
 377
 378             if( mp_msg_test(MSGT_DEMUX,MSGL_DBG2) ){
 379                 int i;
 380                 for(i=0;i<FFMIN(16, asf->packetsize);i++) printf(" %02X",asf->packet[i]);
 381                 printf("\n");
 382             }
 383
 384             // skip ECC data if present by testing bit 7 of flags
 385             // 1xxxbbbb -> ecc data present, skip bbbb byte(s)
 386             // 0xxxxxxx -> payload parsing info starts
 387             if (flags & 0x80)
 388             {
 389                 p += (flags & 0x0f)+1;
 390                 if (p+1 >= p_end) return 0; // Packet too short
 391                 flags = p[0];
 392                 segtype = p[1];
 393             }
 394
 395             //if(segtype!=0x5d) printf("Warning! packet[4] != 0x5d  \n");
 396
 397             p+=2; // skip flags & segtype
 398
 399             // Read packet size (plen):
 400             if(!check_varlen(p, p_end, flags>> 5)) return 0; // Not enough data
 401             plen = read_varlen(&p, flags >> 5, 0);
 402
 403             // Read sequence:
 404             if(!check_varlen(p, p_end, flags>> 1)) return 0; // Not enough data
 405             sequence = read_varlen(&p, flags >> 1, 0);
 406
 407             // Read padding size (padding):
 408             if(!check_varlen(p, p_end, flags>> 3)) return 0; // Not enough data
 409             padding = read_varlen(&p, flags >> 3, 0);
 410
 411             if(((flags>>5)&3)!=0){
 412               // Explicit (absoulte) packet size
 413               mp_dbg(MSGT_DEMUX,MSGL_DBG2,"Explicit packet size specified: %d  \n",plen);
 414               if(plen>asf->packetsize) mp_msg(MSGT_DEMUX,MSGL_V,"Warning! plen>packetsize! (%d>%d)  \n",plen,asf->packetsize);
 415             } else {
 416               // Padding (relative) size
 417               plen=asf->packetsize-padding;
 418             }
 419
 420             // Read time & duration:
 421             if (p+5 >= p_end) return 0; // Packet too short
 422             time = AV_RL32(p); p+=4;
 423             duration = AV_RL16(p); p+=2;
 424
 425             // Read payload flags:
 426             if(flags&1){
 427               // multiple sub-packets
 428               if (p >= p_end) return 0; // Packet too short
 429               segsizetype=p[0]>>6;
 430               segs=p[0] & 0x3F;
 431               ++p;
 432             }
 433             mp_dbg(MSGT_DEMUX,MSGL_DBG4,"%08"PRIu64":  flag=%02X  segs=%d  seq=%u  plen=%u  pad=%u  time=%ld  dur=%d\n",
 434               (uint64_t)demux->filepos,flags,segs,sequence,plen,padding,time,duration);
 435
 436             for(seg=0;seg<segs;seg++){
 437               //ASF_segmhdr_t* sh;
 438               unsigned char streamno;
 439               unsigned int seq;
 440               unsigned int x;   // offset or timestamp
 441               unsigned int rlen;
 442               //
 443               int len;
 444               uint64_t time2=0;
 445               int keyframe=0;
 446
 447               if(p>=p_end) {
 448                 mp_msg(MSGT_DEMUX,MSGL_V,"Warning! invalid packet 1, aborting parsing...\n");
 449                 break;
 450               }
 451
 452               if( mp_msg_test(MSGT_DEMUX,MSGL_DBG2) ){
 453                 int i;
 454                 printf("seg %d:",seg);
 455                 for(i=0;i<FFMIN(16, p_end - p);i++) printf(" %02X",p[i]);
 456                 printf("\n");
 457               }
 458
 459               streamno=p[0]&0x7F;
 460               if(p[0]&0x80) keyframe=1;
 461               p++;
 462
 463               // Read media object number (seq):
 464               if(!check_varlen(p, p_end, segtype >> 4)) break; // Not enough data
 465               seq = read_varlen(&p, segtype >> 4, 0);
 466
 467               // Read offset or timestamp:
 468               if(!check_varlen(p, p_end, segtype >> 2)) break; // Not enough data
 469               x = read_varlen(&p, segtype >> 2, 0);
 470
 471               // Read replic.data len:
 472               if(!check_varlen(p, p_end, segtype)) break; // Not enough data
 473               rlen = read_varlen(&p, segtype, 0);
 474
 475 //            printf("### rlen=%d   \n",rlen);
 476
 477               switch(rlen){
 478               case 0x01: // 1 = special, means grouping
 479                 //printf("grouping: %02X  \n",p[0]);
 480                 ++p; // skip PTS delta
 481                 break;
 482               default:
 483                 if(rlen>=8){
 484                     p+=4;       // skip object size
 485                     if (p+3 >= p_end) break; // Packet too short
 486                     time2=AV_RL32(p); // read PTS
 487                     if (asf->asf_is_dvr_ms)
 488                         get_payload_extension_data(demux, &p, streamno, seq, &keyframe, &time2);
 489                     p+=rlen-4;
 490                 } else {
 491                     mp_msg(MSGT_DEMUX,MSGL_V,"unknown segment type (rlen): 0x%02X  \n",rlen);
 492                     time2=0; // unknown
 493                     p+=rlen;
 494                 }
 495               }
 496
 497               if(flags&1){
 498                 // multiple segments
 499                 if(!check_varlen(p, p_end, segsizetype)) break; // Not enough data
 500                 len = read_varlen(&p, segsizetype, plen-(p-asf->packet));
 501               } else {
 502                 // single segment
 503                 len=plen-(p-asf->packet);
 504               }
 505               if(len<0 || (p+len)>p_end){
 506                 mp_msg(MSGT_DEMUX,MSGL_V,"ASF_parser: warning! segment len=%d\n",len);
 507                 len = p_end - p;
 508               }
 509               mp_dbg(MSGT_DEMUX,MSGL_DBG4,"  seg #%d: streamno=%d  seq=%d  type=%02X  len=%d\n",seg,streamno,seq,rlen,len);
 510
 511               switch(rlen){
 512               case 0x01:
 513                 // GROUPING:
 514                 //printf("ASF_parser: warning! grouping (flag=1) not yet supported!\n",len);
 515                 //printf("  total: %d  \n",len);
 516                 while(len>0){
 517                   int len2=p[0];
 518                   p++;
 519                   //printf("  group part: %d bytes\n",len2);
 520                   if(len2 > len - 1 || len2 < 0) break; // Not enough data
 521                   len2 = FFMIN(len2, asf->packetsize);
 522                   demux_asf_read_packet(demux,p,len2,streamno,seq,x,duration,-1,keyframe);
 523                   p+=len2;
 524                   len-=len2+1;
 525                   ++seq;
 526                 }
 527                 if(len!=0){
 528                   mp_msg(MSGT_DEMUX,MSGL_V,"ASF_parser: warning! groups total != len\n");
 529                 }
 530                 break;
 531               default:
 532                 // NO GROUPING:
 533                 //printf("fragment offset: %d  \n",sh->x);
 534                 if (len <= 0) break;
 535                 if (!asf->asf_is_dvr_ms || asf->found_first_key_frame) {
 536                     len = FFMIN(len, asf->packetsize);
 537                     demux_asf_read_packet(demux,p,len,streamno,seq,time2,duration,x,keyframe);
 538                 }
 539                 p+=len;
 540                 break;
 541               }
 542
 543             } // for segs
 544             return 1; // success
 545     }
 546
 547     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]);
 548     return 0;
 549 }
 550
 551 #include "stheader.h"
 552
 553 void skip_audio_frame(sh_audio_t *sh_audio);
 554
 555 static void demux_seek_asf(demuxer_t *demuxer,float rel_seek_secs,float audio_delay,int flags){
 556     struct asf_priv* asf = demuxer->priv;
 557     demux_stream_t *d_audio=demuxer->audio;
 558     demux_stream_t *d_video=demuxer->video;
 559     sh_audio_t *sh_audio=d_audio->sh;
 560 //    sh_video_t *sh_video=d_video->sh;
 561
 562   //FIXME: OFF_T - didn't test ASF case yet (don't have a large asf...)
 563   //FIXME: reports good or bad to steve@daviesfam.org please
 564
 565   //================= seek in ASF ==========================
 566     float p_rate=asf->packetrate; // packets / sec
 567     off_t rel_seek_packs=(flags&SEEK_FACTOR)?    // FIXME: int may be enough?
 568         (rel_seek_secs*(demuxer->movi_end-demuxer->movi_start)/asf->packetsize):
 569         (rel_seek_secs*p_rate);
 570     off_t rel_seek_bytes=rel_seek_packs*asf->packetsize;
 571     off_t newpos;
 572     //printf("ASF: packs: %d  duration: %d  \n",(int)fileh.packets,*((int*)&fileh.duration));
 573 //    printf("ASF_seek: %d secs -> %d packs -> %d bytes  \n",
 574 //       rel_seek_secs,rel_seek_packs,rel_seek_bytes);
 575     newpos=((flags&SEEK_ABSOLUTE)?demuxer->movi_start:demuxer->filepos)+rel_seek_bytes;
 576     if(newpos<0 || newpos<demuxer->movi_start) newpos=demuxer->movi_start;
 577 //    printf("\r -- asf: newpos=%d -- \n",newpos);
 578     stream_seek(demuxer->stream,newpos);
 579
 580     if (asf->asf_is_dvr_ms) asf->dvr_last_vid_pts = 0.0f;
 581
 582     if (d_video->id >= 0)
 583     ds_fill_buffer(d_video);
 584     if(sh_audio){
 585       ds_fill_buffer(d_audio);
 586     }
 587
 588     if (d_video->id >= 0)
 589     while(1){
 590         if(sh_audio && !d_audio->eof){
 591           float a_pts=d_audio->pts;
 592           a_pts+=(ds_tell_pts(d_audio)-sh_audio->a_in_buffer_len)/(float)sh_audio->i_bps;
 593           // sync audio:
 594           if (d_video->pts > a_pts){
 595               skip_audio_frame(sh_audio);
 596 //            if(!ds_fill_buffer(d_audio)) sh_audio=NULL; // skip audio. EOF?
 597               continue;
 598           }
 599         }
 600         if(d_video->flags&1) break; // found a keyframe!
 601         if(!ds_fill_buffer(d_video)) break; // skip frame.  EOF?
 602     }
 603
 604
 605 }
 606
 607 static int demux_asf_control(demuxer_t *demuxer,int cmd, void *arg){
 608     struct asf_priv* asf = demuxer->priv;
 609 /*  demux_stream_t *d_audio=demuxer->audio;
 610     demux_stream_t *d_video=demuxer->video;
 611     sh_audio_t *sh_audio=d_audio->sh;
 612     sh_video_t *sh_video=d_video->sh;
 613 */
 614     switch(cmd) {
 615         case DEMUXER_CTRL_GET_TIME_LENGTH:
 616             *((double *)arg)=(double)(asf->movielength);
 617             return DEMUXER_CTRL_OK;
 618
 619         case DEMUXER_CTRL_GET_PERCENT_POS:
 620                 return DEMUXER_CTRL_DONTKNOW;
 621
 622         default:
 623             return DEMUXER_CTRL_NOTIMPL;
 624     }
 625 }
 626
 627
 628 static demuxer_t* demux_open_asf(demuxer_t* demuxer)
 629 {
 630     struct asf_priv* asf = demuxer->priv;
 631     sh_audio_t *sh_audio=NULL;
 632     sh_video_t *sh_video=NULL;
 633
 634     //---- ASF header:
 635     if(!asf) return NULL;
 636     init_priv(asf);
 637     if (!read_asf_header(demuxer,asf))
 638         return NULL;
 639     stream_reset(demuxer->stream);
 640     stream_seek(demuxer->stream,demuxer->movi_start);
 641 //    demuxer->idx_pos=0;
 642 //    demuxer->endpos=avi_header.movi_end;
 643     if(demuxer->video->id != -2) {
 644         if(!ds_fill_buffer(demuxer->video)){
 645             mp_tmsg(MSGT_DEMUXER,MSGL_WARN,"ASF: " "No video stream found.\n");
 646             demuxer->video->sh=NULL;
 647             //printf("ASF: missing video stream!? contact the author, it may be a bug :(\n");
 648         } else {
 649             sh_video=demuxer->video->sh;sh_video->ds=demuxer->video;
 650             sh_video->fps=1000.0f; sh_video->frametime=0.001f;
 651
 652             if (asf->asf_is_dvr_ms) {
 653                 sh_video->bih->biWidth = 0;
 654                 sh_video->bih->biHeight = 0;
 655             }
 656         }
 657     }
 658
 659     if(demuxer->audio->id!=-2){
 660         mp_tmsg(MSGT_DEMUXER,MSGL_V,"ASF: Searching for audio stream (id:%d).\n",demuxer->audio->id);
 661         if(!ds_fill_buffer(demuxer->audio)){
 662             mp_tmsg(MSGT_DEMUXER,MSGL_INFO,"ASF: " "No audio stream found -> no sound.\n");
 663             demuxer->audio->sh=NULL;
 664         } else {
 665             sh_audio=demuxer->audio->sh;sh_audio->ds=demuxer->audio;
 666             sh_audio->format=sh_audio->wf->wFormatTag;
 667         }
 668     }
 669     if(!demuxer->stream->seek)
 670         demuxer->seekable=0;
 671
 672     return demuxer;
 673 }
 674
 675
 676 static void demux_close_asf(demuxer_t *demuxer) {
 677     struct asf_priv* asf = demuxer->priv;
 678
 679     if (!asf) return;
 680
 681     if (asf->aud_repdata_sizes)
 682       free(asf->aud_repdata_sizes);
 683
 684     if (asf->vid_repdata_sizes)
 685       free(asf->vid_repdata_sizes);
 686
 687     free(asf);
 688 }
 689
 690 const demuxer_desc_t demuxer_desc_asf = {
 691   "ASF demuxer",
 692   "asf",
 693   "ASF",
 694   "A'rpi",
 695   "ASF, WMV, WMA",
 696   DEMUXER_TYPE_ASF,
 697   1, // safe autodetect
 698   asf_check_header,
 699   demux_asf_fill_buffer,
 700   demux_open_asf,
 701   demux_close_asf,
 702   demux_seek_asf,
 703   demux_asf_control
 704 };