stream/pnm.c

   1 /*
   2  * Copyright (C) 2000-2002 the xine project
   3  *
   4  * This file is part of xine, a free video player.
   5  *
   6  * xine is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * xine is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19  *
  20  * $Id$
  21  *
  22  * pnm protocol implementation
  23  * based upon code from joschka
  24  */
  25
  26 #include "config.h"
  27
  28 #include <unistd.h>
  29 #include <stdio.h>
  30 #include <assert.h>
  31 #include <string.h>
  32 #include <sys/stat.h>
  33 #include <fcntl.h>
  34 #include <errno.h>
  35 #include <stdlib.h>
  36 #include <sys/time.h>
  37 #include <inttypes.h>
  38 #if !HAVE_WINSOCK2_H
  39 #include <sys/socket.h>
  40 //#include <netinet/in.h>
  41 //#include <netdb.h>
  42 #else
  43 #include <winsock2.h>
  44 #endif
  45
  46 #include "libavutil/intreadwrite.h"
  47
  48 #include "stream.h"
  49 #include "libmpdemux/demuxer.h"
  50 #include "help_mp.h"
  51 #include "osdep/timer.h"
  52 #include "network.h"
  53 #include "pnm.h"
  54 #include "tcp.h"
  55 //#include "libreal/rmff.h"
  56
  57 extern int network_bandwidth;
  58
  59 #define FOURCC_TAG( ch0, ch1, ch2, ch3 ) \
  60         (((long)(unsigned char)(ch3)       ) | \
  61         ( (long)(unsigned char)(ch2) << 8  ) | \
  62         ( (long)(unsigned char)(ch1) << 16 ) | \
  63         ( (long)(unsigned char)(ch0) << 24 ) )
  64
  65
  66 #define RMF_TAG   FOURCC_TAG('.', 'R', 'M', 'F')
  67 #define PROP_TAG  FOURCC_TAG('P', 'R', 'O', 'P')
  68 #define MDPR_TAG  FOURCC_TAG('M', 'D', 'P', 'R')
  69 #define CONT_TAG  FOURCC_TAG('C', 'O', 'N', 'T')
  70 #define DATA_TAG  FOURCC_TAG('D', 'A', 'T', 'A')
  71 #define INDX_TAG  FOURCC_TAG('I', 'N', 'D', 'X')
  72 #define PNA_TAG   FOURCC_TAG('P', 'N', 'A',  0 )
  73
  74 /*
  75 #define LOG
  76 */
  77
  78 #define BUF_SIZE 4096
  79 #define HEADER_SIZE 4096
  80
  81 struct pnm_s {
  82
  83   int           s;
  84
  85 //  char         *host;
  86 //  int           port;
  87   char         *path;
  88 //  char         *url;
  89
  90   char          buffer[BUF_SIZE]; /* scratch buffer */
  91
  92   /* receive buffer */
  93   uint8_t       recv[BUF_SIZE];
  94   int           recv_size;
  95   int           recv_read;
  96
  97   uint8_t       header[HEADER_SIZE];
  98   int           header_len;
  99   int           header_read;
 100   unsigned int  seq_num[4];     /* two streams with two indices   */
 101   unsigned int  seq_current[2]; /* seqs of last stream chunk read */
 102   uint32_t      ts_current;     /* timestamp of current chunk     */
 103   uint32_t      ts_last[2];     /* timestamps of last chunks      */
 104   unsigned int  packet;         /* number of last recieved packet */
 105 };
 106
 107 /* sizes */
 108 #define PREAMBLE_SIZE 8
 109 #define CHECKSUM_SIZE 3
 110
 111
 112 /* header of rm files */
 113 static const unsigned char rm_header[]={
 114         0x2e, 0x52, 0x4d, 0x46, /* object_id      ".RMF" */
 115         0x00, 0x00, 0x00, 0x12, /* header_size    0x12   */
 116         0x00, 0x00,             /* object_version 0x00   */
 117         0x00, 0x00, 0x00, 0x00, /* file_version   0x00   */
 118         0x00, 0x00, 0x00, 0x06  /* num_headers    0x06   */
 119 };
 120
 121 /* data chunk header */
 122 static const unsigned char pnm_data_header[]={
 123         'D','A','T','A',
 124          0,0,0,0,       /* data chunk size  */
 125          0,0,           /* object version   */
 126          0,0,0,0,       /* num packets      */
 127          0,0,0,0};      /* next data header */
 128
 129 /* pnm request chunk ids */
 130
 131 #define PNA_CLIENT_CAPS      0x03
 132 #define PNA_CLIENT_CHALLANGE 0x04
 133 #define PNA_BANDWIDTH        0x05
 134 #define PNA_GUID             0x13
 135 #define PNA_TIMESTAMP        0x17
 136 #define PNA_TWENTYFOUR       0x18
 137
 138 #define PNA_CLIENT_STRING    0x63
 139 #define PNA_PATH_REQUEST     0x52
 140
 141 static const unsigned char pnm_challenge[] = "0990f6b4508b51e801bd6da011ad7b56";
 142 static const unsigned char pnm_timestamp[] = "[15/06/1999:22:22:49 00:00]";
 143 static const unsigned char pnm_guid[]      = "3eac2411-83d5-11d2-f3ea-d7c3a51aa8b0";
 144 static const unsigned char pnm_response[]  = "97715a899cbe41cee00dd434851535bf";
 145 static const unsigned char client_string[] = "WinNT_9.0_6.0.6.45_plus32_MP60_en-US_686l";
 146
 147 static const unsigned char pnm_header[] = {
 148         'P','N','A',
 149         0x00, 0x0a,
 150         0x00, 0x14,
 151         0x00, 0x02,
 152         0x00, 0x01 };
 153
 154 static const unsigned char pnm_client_caps[] = {
 155     0x07, 0x8a, 'p','n','r','v',
 156        0, 0x90, 'p','n','r','v',
 157        0, 0x64, 'd','n','e','t',
 158        0, 0x46, 'p','n','r','v',
 159        0, 0x32, 'd','n','e','t',
 160        0, 0x2b, 'p','n','r','v',
 161        0, 0x28, 'd','n','e','t',
 162        0, 0x24, 'p','n','r','v',
 163        0, 0x19, 'd','n','e','t',
 164        0, 0x18, 'p','n','r','v',
 165        0, 0x14, 's','i','p','r',
 166        0, 0x14, 'd','n','e','t',
 167        0, 0x24, '2','8','_','8',
 168        0, 0x12, 'p','n','r','v',
 169        0, 0x0f, 'd','n','e','t',
 170        0, 0x0a, 's','i','p','r',
 171        0, 0x0a, 'd','n','e','t',
 172        0, 0x08, 's','i','p','r',
 173        0, 0x06, 's','i','p','r',
 174        0, 0x12, 'l','p','c','J',
 175        0, 0x07, '0','5','_','6' };
 176
 177 static const uint32_t pnm_default_bandwidth=10485800;
 178 static const uint32_t pnm_available_bandwidths[]={14400,19200,28800,33600,34430,57600,
 179                                   115200,262200,393216,524300,1544000,10485800};
 180
 181 static const unsigned char pnm_twentyfour[]={
 182     0xd5, 0x42, 0xa3, 0x1b, 0xef, 0x1f, 0x70, 0x24,
 183     0x85, 0x29, 0xb3, 0x8d, 0xba, 0x11, 0xf3, 0xd6 };
 184
 185 /* now other data follows. marked with 0x0000 at the beginning */
 186 static const unsigned char after_chunks[]={
 187     0x00, 0x00, /* mark */
 188
 189     0x50, 0x84, /* seems to be fixated */
 190     0x1f, 0x3a  /* varies on each request (checksum ?)*/
 191     };
 192
 193 static void hexdump (char *buf, int length);
 194
 195 static int rm_write(int s, const char *buf, int len) {
 196   int total, timeout;
 197
 198   total = 0; timeout = 30;
 199   while (total < len){
 200     int n;
 201
 202     n = send (s, &buf[total], len - total, 0);
 203
 204     if (n > 0)
 205       total += n;
 206     else if (n < 0) {
 207 #if !HAVE_WINSOCK2_H
 208       if (timeout>0 && (errno == EAGAIN || errno == EINPROGRESS)) {
 209 #else
 210       if (timeout>0 && (errno == EAGAIN || WSAGetLastError() == WSAEINPROGRESS)) {
 211 #endif
 212         usec_sleep (1000000); timeout--;
 213       } else
 214         return -1;
 215     }
 216   }
 217
 218   return total;
 219 }
 220
 221 static ssize_t rm_read(int fd, void *buf, size_t count) {
 222
 223   ssize_t ret, total;
 224
 225   total = 0;
 226
 227   while (total < count) {
 228
 229     fd_set rset;
 230     struct timeval timeout;
 231
 232     FD_ZERO (&rset);
 233     FD_SET  (fd, &rset);
 234
 235     timeout.tv_sec  = 3;
 236     timeout.tv_usec = 0;
 237
 238     if (select (fd+1, &rset, NULL, NULL, &timeout) <= 0) {
 239       return -1;
 240     }
 241
 242     ret=recv (fd, ((uint8_t*)buf)+total, count-total, 0);
 243
 244     if (ret<=0) {
 245       mp_msg(MSGT_OPEN, MSGL_ERR, "input_pnm: read error.\n");
 246       return ret;
 247     } else
 248       total += ret;
 249   }
 250
 251   return total;
 252 }
 253
 254 /*
 255  * debugging utilities
 256  */
 257
 258 static void hexdump (char *buf, int length) {
 259
 260   int i;
 261
 262   mp_msg(MSGT_OPEN, MSGL_INFO, "input_pnm: ascii>");
 263   for (i = 0; i < length; i++) {
 264     unsigned char c = buf[i];
 265
 266     if (c >= 32 && c <= 128)
 267       mp_msg(MSGT_OPEN, MSGL_INFO, "%c", c);
 268     else
 269       mp_msg(MSGT_OPEN, MSGL_INFO, ".");
 270   }
 271   mp_msg(MSGT_OPEN, MSGL_INFO, "\n");
 272
 273   mp_msg(MSGT_OPEN, MSGL_INFO, "input_pnm: hexdump> ");
 274   for (i = 0; i < length; i++) {
 275     unsigned char c = buf[i];
 276
 277     mp_msg(MSGT_OPEN, MSGL_INFO, "%02x", c);
 278
 279     if ((i % 16) == 15)
 280       mp_msg(MSGT_OPEN, MSGL_INFO, "\npnm:         ");
 281
 282     if ((i % 2) == 1)
 283       mp_msg(MSGT_OPEN, MSGL_INFO, " ");
 284
 285   }
 286   mp_msg(MSGT_OPEN, MSGL_INFO, "\n");
 287 }
 288
 289 /*
 290  * pnm_get_chunk gets a chunk from stream
 291  * and returns number of bytes read
 292  */
 293
 294 static int pnm_get_chunk(pnm_t *p,
 295                          unsigned int max,
 296                          unsigned int *chunk_type,
 297                          char *data, int *need_response) {
 298
 299   unsigned int chunk_size;
 300   unsigned int n;
 301   char *ptr;
 302
 303   if (max < PREAMBLE_SIZE)
 304     return -1;
 305
 306   /* get first PREAMBLE_SIZE bytes and ignore checksum */
 307   rm_read (p->s, data, CHECKSUM_SIZE);
 308   if (data[0] == 0x72)
 309     rm_read (p->s, data, PREAMBLE_SIZE);
 310   else
 311     rm_read (p->s, data+CHECKSUM_SIZE, PREAMBLE_SIZE-CHECKSUM_SIZE);
 312
 313   max -= PREAMBLE_SIZE;
 314
 315   *chunk_type = AV_RB32(data);
 316   chunk_size = AV_RB32(data+4);
 317
 318   switch (*chunk_type) {
 319     case PNA_TAG:
 320       *need_response=0;
 321       ptr=data+PREAMBLE_SIZE;
 322       if (max < 1)
 323         return -1;
 324       rm_read (p->s, ptr++, 1);
 325       max -= 1;
 326
 327       while(1) {
 328         /* expecting following chunk format: 0x4f <chunk size> <data...> */
 329
 330         if (max < 2)
 331           return -1;
 332         rm_read (p->s, ptr, 2);
 333         max -= 2;
 334         if (*ptr == 'X') /* checking for server message */
 335         {
 336           mp_msg(MSGT_OPEN, MSGL_WARN, "input_pnm: got a message from server:\n");
 337           if (max < 1)
 338             return -1;
 339           rm_read (p->s, ptr+2, 1);
 340           max = -1;
 341           n=AV_RB16(ptr+1);
 342           if (max < n)
 343             return -1;
 344           rm_read (p->s, ptr+3, n);
 345           max -= n;
 346           ptr[3+n]=0;
 347           mp_msg(MSGT_OPEN, MSGL_WARN, "%s\n",ptr+3);
 348           return -1;
 349         }
 350
 351         if (*ptr == 'F') /* checking for server error */
 352         {
 353           mp_msg(MSGT_OPEN, MSGL_ERR, "input_pnm: server error.\n");
 354           return -1;
 355         }
 356         if (*ptr == 'i')
 357         {
 358           ptr+=2;
 359           *need_response=1;
 360           continue;
 361         }
 362         if (*ptr != 0x4f) break;
 363         n=ptr[1];
 364         if (max < n)
 365           return -1;
 366         rm_read (p->s, ptr+2, n);
 367         max -= n;
 368         ptr+=(n+2);
 369       }
 370       /* the checksum of the next chunk is ignored here */
 371       if (max < 1)
 372         return -1;
 373       rm_read (p->s, ptr+2, 1);
 374       ptr+=3;
 375       chunk_size=ptr-data;
 376       break;
 377     case RMF_TAG:
 378     case DATA_TAG:
 379     case PROP_TAG:
 380     case MDPR_TAG:
 381     case CONT_TAG:
 382       if (chunk_size > max || chunk_size < PREAMBLE_SIZE) {
 383         mp_msg(MSGT_OPEN, MSGL_ERR, "error: max chunk size exceded (max was 0x%04x)\n", max);
 384 #ifdef LOG
 385         n=rm_read (p->s, &data[PREAMBLE_SIZE], 0x100 - PREAMBLE_SIZE);
 386         hexdump(data,n+PREAMBLE_SIZE);
 387 #endif
 388         return -1;
 389       }
 390       rm_read (p->s, &data[PREAMBLE_SIZE], chunk_size-PREAMBLE_SIZE);
 391       break;
 392     default:
 393       *chunk_type = 0;
 394       chunk_size  = PREAMBLE_SIZE;
 395       break;
 396   }
 397
 398   return chunk_size;
 399 }
 400
 401 /*
 402  * writes a chunk to a buffer, returns number of bytes written
 403  */
 404
 405 static int pnm_write_chunk(uint16_t chunk_id, uint16_t length,
 406     const char *chunk, char *data) {
 407
 408   AV_WB16(&data[0], chunk_id);
 409   AV_WB16(&data[2], length);
 410   memcpy(&data[4],chunk,length);
 411
 412   return length+4;
 413 }
 414
 415 /*
 416  * constructs a request and sends it
 417  */
 418
 419 static void pnm_send_request(pnm_t *p, uint32_t bandwidth) {
 420
 421   uint16_t i16;
 422   int c=sizeof(pnm_header);
 423   char fixme[]={0,1};
 424
 425   memcpy(p->buffer,pnm_header,sizeof(pnm_header));
 426   c+=pnm_write_chunk(PNA_CLIENT_CHALLANGE,strlen(pnm_challenge),
 427           pnm_challenge,&p->buffer[c]);
 428   c+=pnm_write_chunk(PNA_CLIENT_CAPS,sizeof(pnm_client_caps),
 429           pnm_client_caps,&p->buffer[c]);
 430   c+=pnm_write_chunk(0x0a,0,NULL,&p->buffer[c]);
 431   c+=pnm_write_chunk(0x0c,0,NULL,&p->buffer[c]);
 432   c+=pnm_write_chunk(0x0d,0,NULL,&p->buffer[c]);
 433   c+=pnm_write_chunk(0x16,2,fixme,&p->buffer[c]);
 434   c+=pnm_write_chunk(PNA_TIMESTAMP,strlen(pnm_timestamp),
 435           pnm_timestamp,&p->buffer[c]);
 436   c+=pnm_write_chunk(PNA_BANDWIDTH,4,
 437           (const char *)&pnm_default_bandwidth,&p->buffer[c]);
 438   c+=pnm_write_chunk(0x08,0,NULL,&p->buffer[c]);
 439   c+=pnm_write_chunk(0x0e,0,NULL,&p->buffer[c]);
 440   c+=pnm_write_chunk(0x0f,0,NULL,&p->buffer[c]);
 441   c+=pnm_write_chunk(0x11,0,NULL,&p->buffer[c]);
 442   c+=pnm_write_chunk(0x10,0,NULL,&p->buffer[c]);
 443   c+=pnm_write_chunk(0x15,0,NULL,&p->buffer[c]);
 444   c+=pnm_write_chunk(0x12,0,NULL,&p->buffer[c]);
 445   c+=pnm_write_chunk(PNA_GUID,strlen(pnm_guid),
 446           pnm_guid,&p->buffer[c]);
 447   c+=pnm_write_chunk(PNA_TWENTYFOUR,sizeof(pnm_twentyfour),
 448           pnm_twentyfour,&p->buffer[c]);
 449
 450   /* data after chunks */
 451   memcpy(&p->buffer[c],after_chunks,sizeof(after_chunks));
 452   c+=sizeof(after_chunks);
 453
 454   /* client id string */
 455   p->buffer[c]=PNA_CLIENT_STRING;
 456   AV_WB16(&p->buffer[c+1], strlen(client_string)-1); /* don't know why do we have -1 here */
 457   memcpy(&p->buffer[c+1],&i16,2);
 458   memcpy(&p->buffer[c+3],client_string,strlen(client_string)+1);
 459   c=c+3+strlen(client_string)+1;
 460
 461   /* file path */
 462   p->buffer[c]=0;
 463   p->buffer[c+1]=PNA_PATH_REQUEST;
 464   AV_WB16(&p->buffer[c+2], strlen(p->path));
 465   memcpy(&p->buffer[c+4],p->path,strlen(p->path));
 466   c=c+4+strlen(p->path);
 467
 468   /* some trailing bytes */
 469   p->buffer[c]='y';
 470   p->buffer[c+1]='B';
 471
 472   rm_write(p->s,p->buffer,c+2);
 473 }
 474
 475 /*
 476  * pnm_send_response sends a response of a challenge
 477  */
 478
 479 static void pnm_send_response(pnm_t *p, const char *response) {
 480
 481   int size=strlen(response);
 482
 483   p->buffer[0]=0x23;
 484   p->buffer[1]=0;
 485   p->buffer[2]=(unsigned char) size;
 486
 487   memcpy(&p->buffer[3], response, size);
 488
 489   rm_write (p->s, p->buffer, size+3);
 490
 491 }
 492
 493 /*
 494  * get headers and challenge and fix headers
 495  * write headers to p->header
 496  * write challenge to p->buffer
 497  *
 498  * return 0 on error.  != 0 on success
 499  */
 500
 501 static int pnm_get_headers(pnm_t *p, int *need_response) {
 502
 503   uint32_t chunk_type;
 504   uint8_t  *ptr=p->header;
 505   uint8_t  *prop_hdr=NULL;
 506   int      chunk_size,size=0;
 507   int      nr;
 508 /*  rmff_header_t *h; */
 509
 510   *need_response=0;
 511
 512   while(1) {
 513     if (HEADER_SIZE-size<=0)
 514     {
 515       mp_msg(MSGT_OPEN, MSGL_ERR, "input_pnm: header buffer overflow. exiting\n");
 516       return 0;
 517     }
 518     chunk_size=pnm_get_chunk(p,HEADER_SIZE-size,&chunk_type,ptr,&nr);
 519     if (chunk_size < 0) return 0;
 520     if (chunk_type == 0) break;
 521     if (chunk_type == PNA_TAG)
 522     {
 523       memcpy(ptr, rm_header, sizeof(rm_header));
 524       chunk_size=sizeof(rm_header);
 525       *need_response=nr;
 526     }
 527     if (chunk_type == DATA_TAG)
 528       chunk_size=0;
 529     if (chunk_type == RMF_TAG)
 530       chunk_size=0;
 531     if (chunk_type == PROP_TAG)
 532         prop_hdr=ptr;
 533     size+=chunk_size;
 534     ptr+=chunk_size;
 535   }
 536
 537   if (!prop_hdr) {
 538     mp_msg(MSGT_OPEN, MSGL_ERR, "input_pnm: error while parsing headers.\n");
 539     return 0;
 540   }
 541
 542   /* set data offset */
 543   AV_WB32(&prop_hdr[42], size - 1);
 544
 545   /* read challenge */
 546   memcpy (p->buffer, ptr, PREAMBLE_SIZE);
 547   rm_read (p->s, &p->buffer[PREAMBLE_SIZE], 64);
 548
 549   /* now write a data header */
 550   memcpy(ptr, pnm_data_header, sizeof(pnm_data_header));
 551   size+=sizeof(pnm_data_header);
 552 /*
 553   h=rmff_scan_header(p->header);
 554   rmff_fix_header(h);
 555   p->header_len=rmff_get_header_size(h);
 556   rmff_dump_header(h, p->header, HEADER_SIZE);
 557 */
 558   p->header_len=size;
 559
 560   return 1;
 561 }
 562
 563 /*
 564  * determine correct stream number by looking at indices
 565  */
 566
 567 static int pnm_calc_stream(pnm_t *p) {
 568
 569   char str0=0,str1=0;
 570
 571   /* looking at the first index to
 572    * find possible stream types
 573    */
 574   if (p->seq_current[0]==p->seq_num[0]) str0=1;
 575   if (p->seq_current[0]==p->seq_num[2]) str1=1;
 576
 577   switch (str0+str1) {
 578     case 1: /* one is possible, good. */
 579       if (str0)
 580       {
 581         p->seq_num[0]++;
 582         p->seq_num[1]=p->seq_current[1]+1;
 583         return 0;
 584       } else
 585       {
 586         p->seq_num[2]++;
 587         p->seq_num[3]=p->seq_current[1]+1;
 588         return 1;
 589       }
 590       break;
 591     case 0:
 592     case 2: /* both types or none possible, not so good */
 593       /* try to figure out by second index */
 594       if (   p->seq_current[1] == p->seq_num[1]
 595           && p->seq_current[1] != p->seq_num[3])
 596       {
 597         /* ok, only stream0 matches */
 598         p->seq_num[0]=p->seq_current[0]+1;
 599         p->seq_num[1]++;
 600         return 0;
 601       }
 602       if (   p->seq_current[1] == p->seq_num[3]
 603           && p->seq_current[1] != p->seq_num[1])
 604       {
 605         /* ok, only stream1 matches */
 606         p->seq_num[2]=p->seq_current[0]+1;
 607         p->seq_num[3]++;
 608         return 1;
 609       }
 610       /* wow, both streams match, or not.   */
 611       /* now we try to decide by timestamps */
 612       if (p->ts_current < p->ts_last[1])
 613         return 0;
 614       if (p->ts_current < p->ts_last[0])
 615         return 1;
 616       /* does not help, we guess type 0     */
 617 #ifdef LOG
 618       mp_msg(MSGT_OPEN, MSGL_INFO, "guessing stream# 0\n");
 619 #endif
 620       p->seq_num[0]=p->seq_current[0]+1;
 621       p->seq_num[1]=p->seq_current[1]+1;
 622       return 0;
 623       break;
 624   }
 625   mp_msg(MSGT_OPEN, MSGL_ERR, "input_pnm: wow, something very nasty happened in pnm_calc_stream\n");
 626   return 2;
 627 }
 628
 629 /*
 630  * gets a stream chunk and writes it to a recieve buffer
 631  */
 632
 633 static int pnm_get_stream_chunk(pnm_t *p) {
 634
 635   int  n;
 636   char keepalive='!';
 637   unsigned int fof1, fof2, stream;
 638
 639   /* send a keepalive                               */
 640   /* realplayer seems to do that every 43th package */
 641   if (p->packet%43 == 42)
 642     rm_write(p->s,&keepalive,1);
 643
 644   /* data chunks begin with: 'Z' <o> <o> <i1> 'Z' <i2>
 645    * where <o> is the offset to next stream chunk,
 646    * <i1> is a 16 bit index
 647    * <i2> is a 8 bit index which counts from 0x10 to somewhere
 648    */
 649
 650   n = rm_read (p->s, p->buffer, 8);
 651   if (n<0) return -1;
 652   if (n<8) return 0;
 653
 654   /* skip 8 bytes if 0x62 is read */
 655   if (p->buffer[0] == 0x62)
 656   {
 657     n = rm_read (p->s, p->buffer, 8);
 658     if (n<8) return 0;
 659 #ifdef LOG
 660     mp_msg(MSGT_OPEN, MSGL_WARN, "input_pnm: had to seek 8 bytes on 0x62\n");
 661 #endif
 662   }
 663
 664   /* a server message */
 665   if (p->buffer[0] == 'X')
 666   {
 667     int size=AV_RB16(&p->buffer[1]);
 668
 669     rm_read (p->s, &p->buffer[8], size-5);
 670     p->buffer[size+3]=0;
 671     mp_msg(MSGT_OPEN, MSGL_WARN, "input_pnm: got message from server while reading stream:\n%s\n", &p->buffer[3]);
 672     return -1;
 673   }
 674   if (p->buffer[0] == 'F')
 675   {
 676     mp_msg(MSGT_OPEN, MSGL_ERR, "input_pnm: server error.\n");
 677     return -1;
 678   }
 679
 680   /* skip bytewise to next chunk.
 681    * seems, that we don't need that, if we send enough
 682    * keepalives
 683    */
 684   n=0;
 685   while (p->buffer[0] != 0x5a) {
 686     int i;
 687     for (i=1; i<8; i++)
 688       p->buffer[i-1]=p->buffer[i];
 689     rm_read (p->s, &p->buffer[7], 1);
 690     n++;
 691   }
 692
 693 #ifdef LOG
 694   if (n) mp_msg(MSGT_OPEN, MSGL_WARN, "input_pnm: had to seek %i bytes to next chunk\n", n);
 695 #endif
 696
 697   /* check for 'Z's */
 698   if (p->buffer[0] != 0x5a || p->buffer[7] != 0x5a)
 699   {
 700     mp_msg(MSGT_OPEN, MSGL_ERR, "input_pnm: bad boundaries\n");
 701     hexdump(p->buffer, 8);
 702     return 0;
 703   }
 704
 705   /* check offsets */
 706   fof1=AV_RB16(&p->buffer[1]);
 707   fof2=AV_RB16(&p->buffer[3]);
 708   if (fof1 != fof2)
 709   {
 710     mp_msg(MSGT_OPEN, MSGL_ERR, "input_pnm: frame offsets are different: 0x%04x 0x%04x\n",fof1,fof2);
 711     return 0;
 712   }
 713
 714   /* get first index */
 715   p->seq_current[0]=AV_RB16(&p->buffer[5]);
 716
 717   /* now read the rest of stream chunk */
 718   n = rm_read (p->s, &p->recv[5], fof1-5);
 719   if (n<fof1-5) return 0;
 720
 721   /* get second index */
 722   p->seq_current[1]=p->recv[5];
 723
 724   /* get timestamp */
 725   p->ts_current=AV_RB32(&p->recv[6]);
 726
 727   /* get stream number */
 728   stream=pnm_calc_stream(p);
 729
 730   /* saving timestamp */
 731   p->ts_last[stream]=p->ts_current;
 732
 733   /* constructing a data packet header */
 734
 735   p->recv[0]=0;        /* object version */
 736   p->recv[1]=0;
 737
 738   AV_WB16(&p->recv[2], fof2); /* length */
 739
 740   p->recv[4]=0;         /* stream number */
 741   p->recv[5]=stream;
 742
 743   p->recv[10] &= 0xfe; /* streambox seems to do that... */
 744
 745   p->packet++;
 746
 747   p->recv_size=fof1;
 748
 749   return fof1;
 750 }
 751
 752 // pnm_t *pnm_connect(const char *mrl) {
 753 static pnm_t *pnm_connect(int fd, char *path) {
 754
 755   pnm_t *p=malloc(sizeof(pnm_t));
 756   int need_response=0;
 757
 758   p->path=strdup(path);
 759   p->s=fd;
 760
 761   pnm_send_request(p,pnm_available_bandwidths[10]);
 762   if (!pnm_get_headers(p, &need_response)) {
 763     mp_msg(MSGT_OPEN, MSGL_ERR, "input_pnm: failed to set up stream\n");
 764     free(p->path);
 765     free(p);
 766     return NULL;
 767   }
 768   if (need_response)
 769     pnm_send_response(p, pnm_response);
 770   p->ts_last[0]=0;
 771   p->ts_last[1]=0;
 772
 773   /* copy header to recv */
 774
 775   memcpy(p->recv, p->header, p->header_len);
 776   p->recv_size = p->header_len;
 777   p->recv_read = 0;
 778
 779   return p;
 780 }
 781
 782 static int pnm_read (pnm_t *this, char *data, int len) {
 783
 784   int to_copy=len;
 785   char *dest=data;
 786   char *source=this->recv + this->recv_read;
 787   int fill=this->recv_size - this->recv_read;
 788   int retval;
 789
 790   if (len < 0) return 0;
 791   while (to_copy > fill) {
 792
 793     memcpy(dest, source, fill);
 794     to_copy -= fill;
 795     dest += fill;
 796     this->recv_read=0;
 797
 798     if ((retval = pnm_get_stream_chunk (this)) <= 0) {
 799 #ifdef LOG
 800       mp_msg(MSGT_OPEN, MSGL_INFO, "input_pnm: %d of %d bytes provided\n", len-to_copy, len);
 801 #endif
 802       if (retval < 0)
 803         return retval;
 804       else
 805       return len-to_copy;
 806     }
 807     source = this->recv;
 808     fill = this->recv_size - this->recv_read;
 809   }
 810
 811   memcpy(dest, source, to_copy);
 812   this->recv_read += to_copy;
 813
 814 #ifdef LOG
 815   mp_msg(MSGT_OPEN, MSGL_INFO, "input_pnm: %d bytes provided\n", len);
 816 #endif
 817
 818   return len;
 819 }
 820
 821 static int pnm_streaming_read( int fd, char *buffer, int size, streaming_ctrl_t *stream_ctrl ) {
 822         return pnm_read(stream_ctrl->data, buffer, size);
 823 }
 824
 825 static int open_s(stream_t *stream,int mode, void* opts, int* file_format) {
 826   int fd;
 827   pnm_t *pnm;
 828   URL_t *url;
 829
 830   mp_msg(MSGT_OPEN, MSGL_INFO, "STREAM_PNM, URL: %s\n", stream->url);
 831   stream->streaming_ctrl = streaming_ctrl_new();
 832   if(stream->streaming_ctrl==NULL)
 833     return STREAM_ERROR;
 834
 835   stream->streaming_ctrl->bandwidth = network_bandwidth;
 836   url = url_new(stream->url);
 837   stream->streaming_ctrl->url = check4proxies(url);
 838   //url_free(url);
 839
 840   fd = connect2Server( stream->streaming_ctrl->url->hostname,
 841     stream->streaming_ctrl->url->port ? stream->streaming_ctrl->url->port : 7070,1 );
 842
 843   if(fd<0)
 844     goto fail;
 845
 846   pnm = pnm_connect(fd,stream->streaming_ctrl->url->file);
 847   if(!pnm)
 848     goto fail;
 849   stream->type = STREAMTYPE_STREAM;
 850   stream->fd=fd;
 851   stream->streaming_ctrl->data=pnm;
 852   stream->streaming_ctrl->streaming_read = pnm_streaming_read;
 853   //stream->streaming_ctrl->streaming_seek = nop_streaming_seek;
 854   stream->streaming_ctrl->prebuffer_size = 8*1024;  // 8 KBytes
 855   stream->streaming_ctrl->buffering = 1;
 856   stream->streaming_ctrl->status = streaming_playing_e;
 857   *file_format = DEMUXER_TYPE_REAL;
 858   fixup_network_stream_cache(stream);
 859   return STREAM_OK;
 860
 861 fail:
 862   streaming_ctrl_free(stream->streaming_ctrl);
 863   stream->streaming_ctrl = NULL;
 864   return STREAM_UNSUPPORTED;
 865 }
 866
 867
 868 const stream_info_t stream_info_pnm = {
 869   "RealNetworks pnm",
 870   "pnm",
 871   "Arpi, xine team",
 872   "ported from xine",
 873   open_s,
 874   {"pnm", NULL},        //pnm as fallback
 875   NULL,
 876   0 // Urls are an option string
 877 };