stream/asf_mmst_streaming.c

   1 /*
   2  * MMST implementation taken from the xine-mms plugin made by
   3  * Major MMS (http://geocities.com/majormms/).
   4  * Ported to MPlayer by Abhijeet Phatak <abhijeetphatak@yahoo.com>.
   5  *
   6  * Information about the MMS protocol can be found at http://get.to/sdp
   7  *
   8  * copyright (C) 2002 Abhijeet Phatak <abhijeetphatak@yahoo.com>
   9  * copyright (C) 2002 the xine project
  10  * copyright (C) 2000-2001 major mms
  11  *
  12  * This file is part of MPlayer.
  13  *
  14  * MPlayer is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License as published by
  16  * the Free Software Foundation; either version 2 of the License, or
  17  * (at your option) any later version.
  18  *
  19  * MPlayer is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License along
  25  * with MPlayer; if not, write to the Free Software Foundation, Inc.,
  26  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  27  */
  28
  29
  30 #include <stdio.h>
  31 #include <stdlib.h>
  32 #include <string.h>
  33 #include <unistd.h>
  34 #include <errno.h>
  35 #include <inttypes.h>
  36
  37 #include "config.h"
  38
  39 #include "mp_msg.h"
  40 #include "help_mp.h"
  41
  42 #if HAVE_WINSOCK2_H
  43 #include <winsock2.h>
  44 #endif
  45
  46 #ifndef CONFIG_SETLOCALE
  47 #undef CONFIG_ICONV
  48 #endif
  49
  50 #ifdef CONFIG_ICONV
  51 #include <iconv.h>
  52 #endif
  53
  54 #include "url.h"
  55 #include "libmpdemux/asf.h"
  56
  57 #include "stream.h"
  58
  59 #include "network.h"
  60 #include "tcp.h"
  61
  62 extern int audio_id;
  63 extern int video_id;
  64
  65 #define BUF_SIZE 102400
  66 #define HDR_BUF_SIZE 8192
  67 #define MAX_STREAMS 20
  68
  69 typedef struct
  70 {
  71   uint8_t buf[BUF_SIZE];
  72   int     num_bytes;
  73
  74 } command_t;
  75
  76 static int seq_num;
  77 static int num_stream_ids;
  78 static int stream_ids[MAX_STREAMS];
  79
  80 static int get_data (int s, char *buf, size_t count);
  81
  82 static void put_32 (command_t *cmd, uint32_t value)
  83 {
  84   cmd->buf[cmd->num_bytes  ] = value % 256;
  85   value = value >> 8;
  86   cmd->buf[cmd->num_bytes+1] = value % 256 ;
  87   value = value >> 8;
  88   cmd->buf[cmd->num_bytes+2] = value % 256 ;
  89   value = value >> 8;
  90   cmd->buf[cmd->num_bytes+3] = value % 256 ;
  91
  92   cmd->num_bytes += 4;
  93 }
  94
  95 static uint32_t get_32 (unsigned char *cmd, int offset)
  96 {
  97   uint32_t ret;
  98
  99   ret = cmd[offset] ;
 100   ret |= cmd[offset+1]<<8 ;
 101   ret |= cmd[offset+2]<<16 ;
 102   ret |= cmd[offset+3]<<24 ;
 103
 104   return ret;
 105 }
 106
 107 static void send_command (int s, int command, uint32_t switches,
 108                           uint32_t extra, int length,
 109                           char *data)
 110 {
 111   command_t  cmd;
 112   int        len8;
 113
 114   len8 = (length + 7) / 8;
 115
 116   cmd.num_bytes = 0;
 117
 118   put_32 (&cmd, 0x00000001); /* start sequence */
 119   put_32 (&cmd, 0xB00BFACE); /* #-)) */
 120   put_32 (&cmd, len8*8 + 32);
 121   put_32 (&cmd, 0x20534d4d); /* protocol type "MMS " */
 122   put_32 (&cmd, len8 + 4);
 123   put_32 (&cmd, seq_num);
 124   seq_num++;
 125   put_32 (&cmd, 0x0);        /* unknown */
 126   put_32 (&cmd, 0x0);
 127   put_32 (&cmd, len8+2);
 128   put_32 (&cmd, 0x00030000 | command); /* dir | command */
 129   put_32 (&cmd, switches);
 130   put_32 (&cmd, extra);
 131
 132   memcpy (&cmd.buf[48], data, length);
 133   if (length & 7)
 134     memset(&cmd.buf[48 + length], 0, 8 - (length & 7));
 135
 136   if (send (s, cmd.buf, len8*8+48, 0) != (len8*8+48)) {
 137     mp_msg(MSGT_NETWORK,MSGL_ERR,MSGTR_MPDEMUX_MMST_WriteError);
 138   }
 139 }
 140
 141 #ifdef CONFIG_ICONV
 142 static iconv_t url_conv;
 143 #endif
 144
 145 static void string_utf16(char *dest, char *src, int len) {
 146     int i;
 147 #ifdef CONFIG_ICONV
 148     size_t len1, len2;
 149     char *ip, *op;
 150
 151     if (url_conv != (iconv_t)(-1))
 152     {
 153     memset(dest, 0, 1000);
 154     len1 = len; len2 = 1000;
 155     ip = src; op = dest;
 156
 157     iconv(url_conv, &ip, &len1, &op, &len2);
 158     }
 159     else
 160     {
 161 #endif
 162         if (len > 499) len = 499;
 163         for (i=0; i<len; i++) {
 164             dest[i*2] = src[i];
 165             dest[i*2+1] = 0;
 166         }
 167         /* trailing zeroes */
 168         dest[i*2] = 0;
 169         dest[i*2+1] = 0;
 170 #ifdef CONFIG_ICONV
 171     }
 172 #endif
 173 }
 174
 175 static void get_answer (int s)
 176 {
 177   char  data[BUF_SIZE];
 178   int   command = 0x1b;
 179
 180   while (command == 0x1b) {
 181     int len;
 182
 183     len = recv (s, data, BUF_SIZE, 0) ;
 184     if (!len) {
 185       mp_msg(MSGT_NETWORK,MSGL_ERR,MSGTR_MPDEMUX_MMST_EOFAlert);
 186       return;
 187     }
 188
 189     command = get_32 (data, 36) & 0xFFFF;
 190
 191     if (command == 0x1b)
 192       send_command (s, 0x1b, 0, 0, 0, data);
 193   }
 194 }
 195
 196 static int get_data (int s, char *buf, size_t count)
 197 {
 198   ssize_t  len;
 199   size_t total = 0;
 200
 201   while (total < count) {
 202
 203     len = recv (s, &buf[total], count-total, 0);
 204
 205     if (len<=0) {
 206       perror ("read error:");
 207       return 0;
 208     }
 209
 210     total += len;
 211
 212     if (len != 0) {
 213 //      mp_msg(MSGT_NETWORK,MSGL_INFO,"[%d/%d]", total, count);
 214       fflush (stdout);
 215     }
 216
 217   }
 218
 219   return 1;
 220
 221 }
 222
 223 static int get_header (int s, uint8_t *header, streaming_ctrl_t *streaming_ctrl)
 224 {
 225   unsigned char  pre_header[8];
 226   int            header_len;
 227
 228   header_len = 0;
 229
 230   while (1) {
 231     if (!get_data (s, pre_header, 8)) {
 232       mp_msg(MSGT_NETWORK,MSGL_ERR,MSGTR_MPDEMUX_MMST_PreHeaderReadFailed);
 233       return 0;
 234     }
 235     if (pre_header[4] == 0x02) {
 236
 237       int packet_len;
 238
 239       packet_len = (pre_header[7] << 8 | pre_header[6]) - 8;
 240
 241 //      mp_msg(MSGT_NETWORK,MSGL_INFO,"asf header packet detected, len=%d\n", packet_len);
 242
 243       if (packet_len < 0 || packet_len > HDR_BUF_SIZE - header_len) {
 244         mp_msg(MSGT_NETWORK, MSGL_FATAL, MSGTR_MPDEMUX_MMST_InvalidHeaderSize);
 245         return 0;
 246       }
 247
 248       if (!get_data (s, &header[header_len], packet_len)) {
 249         mp_msg(MSGT_NETWORK,MSGL_ERR,MSGTR_MPDEMUX_MMST_HeaderDataReadFailed);
 250         return 0;
 251       }
 252
 253       header_len += packet_len;
 254
 255       if ( (header[header_len-1] == 1) && (header[header_len-2]==1)) {
 256
 257
 258      if( streaming_bufferize( streaming_ctrl, header, header_len )<0 ) {
 259                                 return -1;
 260          }
 261
 262      // mp_msg(MSGT_NETWORK,MSGL_INFO,"get header packet finished\n");
 263
 264         return header_len;
 265
 266       }
 267
 268     } else {
 269
 270       int32_t packet_len;
 271       int command;
 272       char data[BUF_SIZE];
 273
 274       if (!get_data (s, (char*)&packet_len, 4)) {
 275         mp_msg(MSGT_NETWORK,MSGL_ERR,MSGTR_MPDEMUX_MMST_packet_lenReadFailed);
 276         return 0;
 277       }
 278
 279       packet_len = get_32 ((unsigned char*)&packet_len, 0) + 4;
 280
 281 //      mp_msg(MSGT_NETWORK,MSGL_INFO,"command packet detected, len=%d\n", packet_len);
 282
 283       if (packet_len < 0 || packet_len > BUF_SIZE) {
 284         mp_msg(MSGT_NETWORK, MSGL_FATAL,
 285                 MSGTR_MPDEMUX_MMST_InvalidRTSPPacketSize);
 286         return 0;
 287       }
 288
 289       if (!get_data (s, data, packet_len)) {
 290         mp_msg(MSGT_NETWORK,MSGL_ERR,MSGTR_MPDEMUX_MMST_CmdDataReadFailed);
 291         return 0;
 292       }
 293
 294       command = get_32 (data, 24) & 0xFFFF;
 295
 296 //      mp_msg(MSGT_NETWORK,MSGL_INFO,"command: %02x\n", command);
 297
 298       if (command == 0x1b)
 299         send_command (s, 0x1b, 0, 0, 0, data);
 300
 301     }
 302
 303 //    mp_msg(MSGT_NETWORK,MSGL_INFO,"get header packet succ\n");
 304   }
 305 }
 306
 307 static int interp_header (uint8_t *header, int header_len)
 308 {
 309   int i;
 310   int packet_length=-1;
 311
 312   /*
 313    * parse header
 314    */
 315
 316   i = 30;
 317   while (i<header_len) {
 318
 319     uint64_t  guid_1, guid_2, length;
 320
 321     guid_2 = (uint64_t)header[i] | ((uint64_t)header[i+1]<<8)
 322       | ((uint64_t)header[i+2]<<16) | ((uint64_t)header[i+3]<<24)
 323       | ((uint64_t)header[i+4]<<32) | ((uint64_t)header[i+5]<<40)
 324       | ((uint64_t)header[i+6]<<48) | ((uint64_t)header[i+7]<<56);
 325     i += 8;
 326
 327     guid_1 = (uint64_t)header[i] | ((uint64_t)header[i+1]<<8)
 328       | ((uint64_t)header[i+2]<<16) | ((uint64_t)header[i+3]<<24)
 329       | ((uint64_t)header[i+4]<<32) | ((uint64_t)header[i+5]<<40)
 330       | ((uint64_t)header[i+6]<<48) | ((uint64_t)header[i+7]<<56);
 331     i += 8;
 332
 333 //    mp_msg(MSGT_NETWORK,MSGL_INFO,"guid found: %016llx%016llx\n", guid_1, guid_2);
 334
 335     length = (uint64_t)header[i] | ((uint64_t)header[i+1]<<8)
 336       | ((uint64_t)header[i+2]<<16) | ((uint64_t)header[i+3]<<24)
 337       | ((uint64_t)header[i+4]<<32) | ((uint64_t)header[i+5]<<40)
 338       | ((uint64_t)header[i+6]<<48) | ((uint64_t)header[i+7]<<56);
 339
 340     i += 8;
 341
 342     if ( (guid_1 == 0x6cce6200aa00d9a6ULL) && (guid_2 == 0x11cf668e75b22630ULL) ) {
 343       mp_msg(MSGT_NETWORK,MSGL_INFO,MSGTR_MPDEMUX_MMST_HeaderObject);
 344     } else if ((guid_1 == 0x6cce6200aa00d9a6ULL) && (guid_2 == 0x11cf668e75b22636ULL)) {
 345       mp_msg(MSGT_NETWORK,MSGL_INFO,MSGTR_MPDEMUX_MMST_DataObject);
 346     } else if ((guid_1 == 0x6553200cc000e48eULL) && (guid_2 == 0x11cfa9478cabdca1ULL)) {
 347
 348       packet_length = get_32(header, i+92-24);
 349
 350       mp_msg(MSGT_NETWORK,MSGL_INFO,MSGTR_MPDEMUX_MMST_FileObjectPacketLen,
 351               packet_length, get_32(header, i+96-24));
 352
 353
 354     } else if ((guid_1 == 0x6553200cc000e68eULL) && (guid_2 == 0x11cfa9b7b7dc0791ULL)) {
 355
 356       int stream_id = header[i+48] | header[i+49] << 8;
 357
 358       mp_msg(MSGT_NETWORK,MSGL_INFO,MSGTR_MPDEMUX_MMST_StreamObjectStreamID, stream_id);
 359
 360       if (num_stream_ids < MAX_STREAMS) {
 361       stream_ids[num_stream_ids] = stream_id;
 362       num_stream_ids++;
 363       } else {
 364         mp_msg(MSGT_NETWORK,MSGL_ERR,MSGTR_MPDEMUX_MMST_2ManyStreamID);
 365       }
 366
 367     } else {
 368 #if 0
 369       int b = i;
 370       printf ("unknown object (guid: %016llx, %016llx, len: %lld)\n", guid_1, guid_2, length);
 371       for (; b < length; b++)
 372       {
 373         if (isascii(header[b]) || isalpha(header[b]))
 374             printf("%c ", header[b]);
 375         else
 376             printf("%x ", header[b]);
 377       }
 378       printf("\n");
 379 #else
 380       mp_msg(MSGT_NETWORK,MSGL_WARN,MSGTR_MPDEMUX_MMST_UnknownObject);
 381 #endif
 382     }
 383
 384 //    mp_msg(MSGT_NETWORK,MSGL_INFO,"length    : %lld\n", length);
 385
 386     i += length-24;
 387
 388   }
 389
 390   return packet_length;
 391
 392 }
 393
 394
 395 static int get_media_packet (int s, int padding, streaming_ctrl_t *stream_ctrl) {
 396   unsigned char  pre_header[8];
 397   char           data[BUF_SIZE];
 398
 399   if (!get_data (s, pre_header, 8)) {
 400     mp_msg(MSGT_NETWORK,MSGL_ERR,MSGTR_MPDEMUX_MMST_PreHeaderReadFailed);
 401     return 0;
 402   }
 403
 404 //  for (i=0; i<8; i++)
 405 //    mp_msg(MSGT_NETWORK,MSGL_INFO,"pre_header[%d] = %02x (%d)\n",
 406 //          i, pre_header[i], pre_header[i]);
 407
 408   if (pre_header[4] == 0x04) {
 409
 410     int packet_len;
 411
 412     packet_len = (pre_header[7] << 8 | pre_header[6]) - 8;
 413
 414 //    mp_msg(MSGT_NETWORK,MSGL_INFO,"asf media packet detected, len=%d\n", packet_len);
 415
 416     if (packet_len < 0 || packet_len > BUF_SIZE) {
 417       mp_msg(MSGT_NETWORK, MSGL_FATAL, MSGTR_MPDEMUX_MMST_InvalidRTSPPacketSize);
 418       return 0;
 419     }
 420
 421     if (!get_data (s, data, packet_len)) {
 422       mp_msg(MSGT_NETWORK,MSGL_ERR,MSGTR_MPDEMUX_MMST_MediaDataReadFailed);
 423       return 0;
 424     }
 425
 426     streaming_bufferize(stream_ctrl, data, padding);
 427
 428   } else {
 429
 430     int32_t packet_len;
 431     int command;
 432
 433     if (!get_data (s, (char*)&packet_len, 4)) {
 434       mp_msg(MSGT_NETWORK,MSGL_ERR,MSGTR_MPDEMUX_MMST_packet_lenReadFailed);
 435       return 0;
 436     }
 437
 438     packet_len = get_32 ((unsigned char*)&packet_len, 0) + 4;
 439
 440     if (packet_len < 0 || packet_len > BUF_SIZE) {
 441       mp_msg(MSGT_NETWORK,MSGL_FATAL,MSGTR_MPDEMUX_MMST_InvalidRTSPPacketSize);
 442       return 0;
 443     }
 444
 445     if (!get_data (s, data, packet_len)) {
 446       mp_msg(MSGT_NETWORK,MSGL_ERR,MSGTR_MPDEMUX_MMST_CmdDataReadFailed);
 447       return 0;
 448     }
 449
 450     if ( (pre_header[7] != 0xb0) || (pre_header[6] != 0x0b)
 451          || (pre_header[5] != 0xfa) || (pre_header[4] != 0xce) ) {
 452
 453       mp_msg(MSGT_NETWORK,MSGL_ERR,MSGTR_MPDEMUX_MMST_MissingSignature);
 454       return -1;
 455     }
 456
 457     command = get_32 (data, 24) & 0xFFFF;
 458
 459 //    mp_msg(MSGT_NETWORK,MSGL_INFO,"\ncommand packet detected, len=%d  cmd=0x%X\n", packet_len, command);
 460
 461     if (command == 0x1b)
 462       send_command (s, 0x1b, 0, 0, 0, data);
 463     else if (command == 0x1e) {
 464       mp_msg(MSGT_NETWORK,MSGL_INFO,MSGTR_MPDEMUX_MMST_PatentedTechnologyJoke);
 465       return 0;
 466     }
 467     else if (command == 0x21 ) {
 468         // Looks like it's new in WMS9
 469         // Unknown command, but ignoring it seems to work.
 470         return 0;
 471     }
 472     else if (command != 0x05) {
 473       mp_msg(MSGT_NETWORK,MSGL_ERR,MSGTR_MPDEMUX_MMST_UnknownCmd,command);
 474       return -1;
 475     }
 476   }
 477
 478 //  mp_msg(MSGT_NETWORK,MSGL_INFO,"get media packet succ\n");
 479
 480   return 1;
 481 }
 482
 483
 484 static int packet_length1;
 485
 486 static int asf_mmst_streaming_read( int fd, char *buffer, int size, streaming_ctrl_t *stream_ctrl )
 487 {
 488   int len;
 489
 490   while( stream_ctrl->buffer_size==0 ) {
 491           // buffer is empty - fill it!
 492           int ret = get_media_packet( fd, packet_length1, stream_ctrl);
 493           if( ret<0 ) {
 494                   mp_msg(MSGT_NETWORK,MSGL_ERR,MSGTR_MPDEMUX_MMST_GetMediaPacketErr,strerror(errno));
 495                   return -1;
 496           } else if (ret==0) //EOF?
 497                   return ret;
 498   }
 499
 500           len = stream_ctrl->buffer_size-stream_ctrl->buffer_pos;
 501           if(len>size) len=size;
 502           memcpy( buffer, (stream_ctrl->buffer)+(stream_ctrl->buffer_pos), len );
 503           stream_ctrl->buffer_pos += len;
 504           if( stream_ctrl->buffer_pos>=stream_ctrl->buffer_size ) {
 505                   free( stream_ctrl->buffer );
 506                   stream_ctrl->buffer = NULL;
 507                   stream_ctrl->buffer_size = 0;
 508                   stream_ctrl->buffer_pos = 0;
 509           }
 510           return len;
 511
 512 }
 513
 514 static int asf_mmst_streaming_seek( int fd, off_t pos, streaming_ctrl_t *streaming_ctrl )
 515 {
 516         return -1;
 517         // Shut up gcc warning
 518         fd++;
 519         pos++;
 520         streaming_ctrl=NULL;
 521 }
 522
 523 int asf_mmst_streaming_start(stream_t *stream)
 524 {
 525   char                 str[1024];
 526   char                 data[BUF_SIZE];
 527   uint8_t              asf_header[HDR_BUF_SIZE];
 528   int                  asf_header_len;
 529   int                  len, i, packet_length;
 530   char                *path, *unescpath;
 531   URL_t *url1 = stream->streaming_ctrl->url;
 532   int s = stream->fd;
 533
 534   if( s>0 ) {
 535           closesocket( stream->fd );
 536           stream->fd = -1;
 537   }
 538
 539   /* parse url */
 540   path = strchr(url1->file,'/') + 1;
 541
 542   /* mmst filename are not url_escaped by MS MediaPlayer and are expected as
 543    * "plain text" by the server, so need to decode it here
 544    */
 545   unescpath=malloc(strlen(path)+1);
 546   if (!unescpath) {
 547         mp_msg(MSGT_NETWORK,MSGL_FATAL,MSGTR_MemAllocFailed);
 548         return -1;
 549   }
 550   url_unescape_string(unescpath,path);
 551   path=unescpath;
 552
 553
 554   if( url1->port==0 ) {
 555         url1->port=1755;
 556   }
 557   s = connect2Server( url1->hostname, url1->port, 1);
 558   if( s<0 ) {
 559           free(path);
 560           return s;
 561   }
 562   mp_msg(MSGT_NETWORK,MSGL_INFO,MSGTR_MPDEMUX_MMST_Connected);
 563
 564   seq_num=0;
 565
 566   /*
 567   * Send the initial connect info including player version no. Client GUID (random) and the host address being connected to.
 568   * This command is sent at the very start of protocol initiation. It sends local information to the serve
 569   * cmd 1 0x01
 570   * */
 571
 572   /* prepare for the url encoding conversion */
 573 #ifdef CONFIG_ICONV
 574   url_conv = iconv_open("UTF-16LE", "UTF-8");
 575 #endif
 576
 577   snprintf (str, 1023, "\034\003NSPlayer/7.0.0.1956; {33715801-BAB3-9D85-24E9-03B90328270A}; Host: %s", url1->hostname);
 578   string_utf16 (data, str, strlen(str));
 579 // send_command(s, commandno ....)
 580   send_command (s, 1, 0, 0x0004000b, strlen(str)*2+2, data);
 581
 582   len = recv (s, data, BUF_SIZE, 0) ;
 583
 584   /*This sends details of the local machine IP address to a Funnel system at the server.
 585   * Also, the TCP or UDP transport selection is sent.
 586   *
 587   * here 192.168.0.1 is local ip address TCP/UDP states the tronsport we r using
 588   * and 1037 is the  local TCP or UDP socket number
 589   * cmd 2 0x02
 590   *  */
 591
 592   string_utf16 (&data[8], "\002\000\\\\192.168.0.1\\TCP\\1037", 24);
 593   memset (data, 0, 8);
 594   send_command (s, 2, 0, 0, 24*2+10, data);
 595
 596   len = recv (s, data, BUF_SIZE, 0) ;
 597
 598   /* This command sends file path (at server) and file name request to the server.
 599   * 0x5 */
 600
 601   string_utf16 (&data[8], path, strlen(path));
 602   memset (data, 0, 8);
 603   send_command (s, 5, 0, 0, strlen(path)*2+10, data);
 604   free(path);
 605
 606   get_answer (s);
 607
 608   /* The ASF header chunk request. Includes ?session' variable for pre header value.
 609   * After this command is sent,
 610   * the server replies with 0x11 command and then the header chunk with header data follows.
 611   * 0x15 */
 612
 613   memset (data, 0, 40);
 614   data[32] = 2;
 615
 616   send_command (s, 0x15, 1, 0, 40, data);
 617
 618   num_stream_ids = 0;
 619   /* get_headers(s, asf_header);  */
 620
 621   asf_header_len = get_header (s, asf_header, stream->streaming_ctrl);
 622 //  mp_msg(MSGT_NETWORK,MSGL_INFO,"---------------------------------- asf_header %d\n",asf_header);
 623   if (asf_header_len==0) { //error reading header
 624     closesocket(s);
 625     return -1;
 626   }
 627   packet_length = interp_header (asf_header, asf_header_len);
 628
 629
 630   /*
 631   * This command is the media stream MBR selector. Switches are always 6 bytes in length.
 632   * After all switch elements, data ends with bytes [00 00] 00 20 ac 40 [02].
 633   * Where:
 634   * [00 00] shows 0x61 0x00 (on the first 33 sent) or 0xff 0xff for ASF files, and with no ending data for WMV files.
 635   * It is not yet understood what all this means.
 636   * And the last [02] byte is probably the header ?session' value.
 637   *
 638   *  0x33 */
 639
 640   memset (data, 0, 40);
 641
 642   if (audio_id > 0) {
 643     data[2] = 0xFF;
 644     data[3] = 0xFF;
 645     data[4] = audio_id;
 646     send_command(s, 0x33, num_stream_ids, 0xFFFF | audio_id << 16, 8, data);
 647   } else {
 648   for (i=1; i<num_stream_ids; i++) {
 649     data [ (i-1) * 6 + 2 ] = 0xFF;
 650     data [ (i-1) * 6 + 3 ] = 0xFF;
 651     data [ (i-1) * 6 + 4 ] = stream_ids[i];
 652     data [ (i-1) * 6 + 5 ] = 0x00;
 653   }
 654
 655   send_command (s, 0x33, num_stream_ids, 0xFFFF | stream_ids[0] << 16, (num_stream_ids-1)*6+2 , data);
 656   }
 657
 658   get_answer (s);
 659
 660   /* Start sending file from packet xx.
 661   * This command is also used for resume downloads or requesting a lost packet.
 662   * Also used for seeking by sending a play point value which seeks to the media time point.
 663   * Includes ?session' value in pre header and the maximum media stream time.
 664   * 0x07 */
 665
 666   memset (data, 0, 40);
 667
 668   for (i=8; i<16; i++)
 669     data[i] = 0xFF;
 670
 671   data[20] = 0x04;
 672
 673   send_command (s, 0x07, 1, 0xFFFF | stream_ids[0] << 16, 24, data);
 674
 675   stream->fd = s;
 676   stream->streaming_ctrl->streaming_read = asf_mmst_streaming_read;
 677   stream->streaming_ctrl->streaming_seek = asf_mmst_streaming_seek;
 678   stream->streaming_ctrl->buffering = 1;
 679   stream->streaming_ctrl->status = streaming_playing_e;
 680
 681   packet_length1 = packet_length;
 682   mp_msg(MSGT_NETWORK,MSGL_INFO,"mmst packet_length = %d\n", packet_length);
 683
 684 #ifdef CONFIG_ICONV
 685   if (url_conv != (iconv_t)(-1))
 686     iconv_close(url_conv);
 687 #endif
 688
 689   return 0;
 690 }