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