aboutsummaryrefslogtreecommitdiff
path: root/mp3live~/mp3streamin~.c
blob: d34150be1722eefdc59f6e0c84cb841bf817b5a5 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
/* ------------------------ mp3streamin~ -------------------------------------- */
/*                                                                              */
/* Tilde object to receive an mp3-stream sent by a peer using mp3streamout~.    */
/* Written by Yves Degoyon (ydegoyon@free.fr).                                  */
/* Tarballs and updates @ http://ydegoyon.free.fr                               */
/*                                                                              */
/* This program is free software; you can redistribute it and/or                */
/* modify it under the terms of the GNU General Public License                  */
/* as published by the Free Software Foundation; either version 2               */
/* of the License, or (at your option) any later version.                       */
/*                                                                              */
/* See file LICENSE for further informations on licensing terms.                */
/*                                                                              */
/* This program is distributed in the hope that it will be useful,              */
/* but WITHOUT ANY WARRANTY; without even the implied warranty of               */
/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the                */
/* GNU General Public License for more details.                                 */
/*                                                                              */
/* You should have received a copy of the GNU General Public License            */
/* along with this program; if not, write to the Free Software                  */
/* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.  */
/*                                                                              */
/* Based on PureData by Miller Puckette and others.                             */
/* Uses the LAME MPEG 1 Layer 3 encoding library (lame_enc.dll) which can       */
/* be found at http://www.cdex.n3.net.                                          */
/*                                                                              */
/* "Repackage sex, your interests."                                              */
/* "Somehow, maintain the interest."                                             */
/* Gang Of Four -- Natural's Not In It                                          */
/* ---------------------------------------------------------------------------- */
                                                                                     

#include <m_pd.h>
#include <m_imp.h>
#include <g_canvas.h>

#if PD_MINOR_VERSION >=37
#include "s_stuff.h"
#endif

#include <sys/types.h>
#include <string.h>
#ifndef WIN32
#include <sys/socket.h>
#include <errno.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <sys/time.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdio.h>
#define SOCKET_ERROR -1
#else
#include <winsock.h>
#endif

#if defined(__APPLE__) || defined(WIN32)
#define MSG_NOSIGNAL 0
#define SOL_TCP IPPROTO_TCP
#endif

#include "mpg123.h"      /* mpg123 decoding library from lame 3.92 */
#include "mpglib.h"      /* mpglib decoding library from lame 3.92 */
#include "interface.h"   /* mpglib decoding library from lame 3.92 */

#define MIN_AUDIO_INPUT 8064 // we must a least have 8 chunks to play a correct sound
#define INPUT_BUFFER_SIZE MIN_AUDIO_INPUT
#define OUTPUT_BUFFER_SIZE 131072 /* 128k*/
#define LAME_AUDIO_CHUNK_SIZE 1152
#define BARHEIGHT 10
#define MAX_DECODERS 10 

/* useful debugging functions from mpglib */
extern int decode_header( struct frame* fr, unsigned long newhead );
extern void print_header_compact( struct frame* fr );
extern int head_check( unsigned long head, int check_layer );

/* time-out used for select() call */
static struct timeval ztout;

static char   *mp3streamin_version = "mp3streamin~: mp3 peer-to-peer streamer version 0.3, written by ydegoyon@free.fr";

extern void sys_sockerror(char *s);

void mp3streamin_closesocket(int fd)
{
#ifdef UNIX
    if ( close(fd) < 0 )
    {
       perror( "close" );
    }
    else
    {
       post( "mp3streamin~ : closed socket : %d", fd );
    }
#endif
#ifdef NT
    closesocket(fd);
#endif
    sys_rmpollfn(fd);
}

int setsocketoptions(int sockfd)
{ 
     int sockopt = 1;
     if (setsockopt(sockfd, SOL_TCP, TCP_NODELAY, (const char*) &sockopt, sizeof(int)) < 0)
     {
	  post("mp3streamin~ : setsockopt TCP_NODELAY failed");
          perror( "setsockopt" );
          return -1;
     }
     else
     {
	  post("mp3streamin~ : TCP_NODELAY set");
     }
     
#ifdef UNIX
     sockopt = 1;    
     if (setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &sockopt, sizeof(int)) < 0)
     {
	  post("mp3streamin~ : setsockopt SO_REUSEADDR failed");
          perror( "setsockopt" );
          return -1;
     }
     else
     {
	  post("mp3streamin~ : setsockopt SO_REUSEADDR done.");
     }
#endif
     return 0;
}


/* ------------------------ mp3streamin~ ----------------------------- */

static t_class *mp3streamin_class;

typedef struct _mp3streamin
{
     t_object x_obj;
     t_int x_instance;
     t_int x_socket;
     t_int x_shutdown;
     t_outlet *x_connectionip;
     t_int x_serversocket;
     t_int x_inpackets;  /* number of packets received */
     t_int x_dpacket;    /* displayed packet in status bar */
     t_int x_packetsize; /* size of the packets */
     t_int x_pblocks;    /* processed blocks */
     t_int x_graphic;    /* indicates if we show a graphic bar */

     void *x_inbuffer;   /* accumulation buffer for incoming mp3 frames */
     t_int x_inwriteposition;
     t_int x_inbuffersize;

     t_float *x_outbuffer;   /* buffer to store audio decoded data */
     t_int x_outwriteposition;
     t_int x_outreadposition;
     t_int x_outunread;
     t_int x_outbuffersize;

     t_canvas *x_canvas;                

     t_int x_stream;         /* indicates if a stream is connected ( meaning correct input flow ) */
     t_int x_newstream;      /* at first, the stream must provide enough data to start */             
     t_int x_bitrateindex;   /* remember the bitrate index */

} t_mp3streamin;

/* too bad, this needs to be static,
   handling an array to enable several decoders in pd */
static  MPSTR   mp[MAX_DECODERS];  /* decoder buffer */
int nbinstances = 0;

void mp3streamin_tilde_mpglib_init(t_mp3streamin *x)
{
  int ret;

     InitMP3(&mp[x->x_instance]);
}

static int mp3streamin_decode_input(t_mp3streamin *x)
{
  int i;
  int alength = 0;
  struct frame hframe;
  unsigned int a,b,c,d;
  unsigned long cheader;
  static char out[8192];
  signed short int *p = (signed short int *) out;
  int     pbytes;
  int     ret;

   if ( !x->x_shutdown )
   {
    /* decode first 4 bytes as the header */
    a = *((unsigned char*)x->x_inbuffer);
    b = *((unsigned char*)x->x_inbuffer+1);
    c = *((unsigned char*)x->x_inbuffer+2);
    d = *((unsigned char*)x->x_inbuffer+3);

    cheader = 0;
    cheader = a;
    cheader <<= 8;
    cheader |= b;
    cheader <<= 8;
    cheader |= c;
    cheader <<= 8;
    cheader |= d;
    if ( head_check( cheader, 0 ) )
    {
      // post( "mp3streamin~ : valid header ( packet=%d)", x->x_inpackets );
      decode_header( &hframe, cheader );
      // print_header_compact( &hframe );
      // when the bitrate change, reinit decoder
      if ( x->x_bitrateindex != hframe.bitrate_index )
      {
         ExitMP3(&mp[x->x_instance]);
         InitMP3(&mp[x->x_instance]);
         x->x_bitrateindex = hframe.bitrate_index;
      }
    } 
    else
    {
      post( "mp3streamin~ : error : mp3 packet received without header" );  
      // ignore data
      x->x_inwriteposition = 0; 
      x->x_inpackets--; 
      return( -1 );
    }

    // post( "mp3streamin~ : decoding %d bytes framesize=%d", x->x_inwriteposition, hframe.framesize );
    ret =
        decodeMP3(&mp[x->x_instance], (unsigned char*)x->x_inbuffer, 
                            x->x_inwriteposition, (char *) p, sizeof(out), &pbytes);

    switch (ret) {
    case MP3_OK:
        switch (mp[x->x_instance].fr.stereo) {
        case 1:
        case 2:
            alength = ((mp[x->x_instance].fr.stereo==1)?pbytes >> 1 : pbytes >> 2);
            // post( "mp3streamin~ : processed %d samples", alength );
            // update outbuffer contents 
            for ( i=0; i<alength; i++ )
            {
              if ( x->x_outunread >= x->x_outbuffersize-2 )
              {
                  post( "mp3streamin~ : too much input ... ignored" );
                  continue;
              }
              *(x->x_outbuffer+x->x_outwriteposition) = ((t_float)(*p++))/32767.0;
              x->x_outwriteposition = (x->x_outwriteposition + 1)%x->x_outbuffersize;
              *(x->x_outbuffer+x->x_outwriteposition) = 
                     ((mp[x->x_instance].fr.stereo==2)?((t_float)(*p++))/32767.0 : 0.0);
              x->x_outwriteposition = (x->x_outwriteposition + 1)%x->x_outbuffersize;
              x->x_outunread+=2;

              if ( x->x_outunread > MIN_AUDIO_INPUT && !x->x_stream )
              {
                  post( "mp3streamin~ : stream connected." );
                  x->x_stream = 1;
              }
            }

            break;
        default:
            alength = -1;
            break;
        }
        break;

    case MP3_NEED_MORE:
        post( "mp3streamin~ : retry lame decoding (more data needed)." );
        alength = 0;
        break;

    case MP3_ERR:
        post( "mp3streamin~ : lame decoding failed." );
        alength = -1;
        break;

    }

    x->x_inwriteposition = 0; 
   }
   else
   {
     if ( x->x_outunread == 0 )
     {
      post( "mp3streamin~ : connection closed" );
      mp3streamin_closesocket(x->x_socket);
      x->x_stream = 0;
      x->x_newstream = 0;
      x->x_inpackets = 0;
      x->x_inwriteposition = 0;
      x->x_bitrateindex = -1;
      x->x_socket=-1;
      outlet_symbol( x->x_connectionip, gensym("") );
     }
   }

   if ( x->x_graphic && glist_isvisible( x->x_canvas ) )
   {
         /* update graphical read status */
     if ( x->x_inpackets != x->x_dpacket ) 
     { 
        char color[32];
        int minpackets = ( MIN_AUDIO_INPUT/LAME_AUDIO_CHUNK_SIZE )-2; // audio loop has eaten some already


            sys_vgui(".x%x.c delete rectangle %xSTATUS\n", x->x_canvas, x );
            sys_vgui(".x%x.c delete line %xTHRESHOLD\n", x->x_canvas, x );
            if ( x->x_outunread > 0 )
            {
             t_int width;

              if ( x->x_inpackets < (MIN_AUDIO_INPUT/LAME_AUDIO_CHUNK_SIZE)/2 )
              {
               strcpy( color, "red" );
              }
              else
              {
               strcpy( color, "lightgreen" );
              }
              width = rtext_width( glist_findrtext( (t_glist*)x->x_canvas, (t_text *)x ) );
              sys_vgui(".x%x.c create rectangle %d %d %d %d -fill %s -tags %xSTATUS\n",
                  x->x_canvas, x->x_obj.te_xpix, x->x_obj.te_ypix-BARHEIGHT-1,
                  x->x_obj.te_xpix+(x->x_inpackets*x->x_packetsize*width)/INPUT_BUFFER_SIZE, 
                  x->x_obj.te_ypix - 1, color, x );
              sys_vgui(".x%x.c create line %d %d %d %d -fill red -tags %xTHRESHOLD\n",
                  x->x_canvas, x->x_obj.te_xpix+(minpackets*x->x_packetsize*width)/INPUT_BUFFER_SIZE, 
                  x->x_obj.te_ypix-BARHEIGHT-1,
                  x->x_obj.te_xpix+(minpackets*x->x_packetsize*width)/INPUT_BUFFER_SIZE, 
                  x->x_obj.te_ypix-1, x );
              x->x_dpacket = x->x_inpackets;
            }
            else
            {
              if ( x->x_shutdown )
              {
                 x->x_shutdown=0;
                 sys_vgui(".x%x.c delete rectangle %xPBAR\n", x->x_canvas, x );
                 sys_vgui(".x%x.c delete line %xTHRESHOLD\n", x->x_canvas, x );
              }
            }
     }
   }
   return alength;
}

static void mp3streamin_recv(t_mp3streamin *x)
{
   int ret;

     if ( ( ret = recv(x->x_socket, (void*) (x->x_inbuffer + x->x_inwriteposition), 
                (size_t)((x->x_inbuffersize-x->x_inwriteposition)), 
                MSG_NOSIGNAL) ) < 0 )
     {
        post( "mp3_streamin~ : receive error" );
        perror( "recv" );
        return; 
     }
     else
     {
        // post( "streamin~ : received %d bytes at %d on %d ( up to %d)", 
        //        ret, x->x_inwriteposition, x->x_socket,
        //        x->x_inbuffersize-x->x_inwriteposition*sizeof( unsigned long) );

        if ( ret == 0 ) 
        {
           /* initiate the shutdown phase */
           x->x_shutdown=1;
        }
        else
        { 
           // check we don't overflow input buffer
           if ( (x->x_inpackets+1)*x->x_packetsize > x->x_inbuffersize )
           {
              post( "mp3streamin~ : too much input...resetting" );
              x->x_inpackets=0;
              x->x_inwriteposition=0;
              return;
           }
           x->x_inpackets++;
           x->x_packetsize=ret;
           if ( x->x_inpackets % 100 == 0 )
           {
              // post( "mp3streamin~ : received %d packets", x->x_inpackets );
           }
           x->x_inwriteposition += ret;
        }
             
        mp3streamin_decode_input(x);
     }
}

static void mp3streamin_acceptconnection(t_mp3streamin *x)
{
    struct sockaddr_in incomer_address;
    int sockaddrl = (int) sizeof( struct sockaddr );

    int fd = accept(x->x_serversocket, (struct sockaddr*)&incomer_address, &sockaddrl );

    if (fd < 0) {
	 post("mp3streamin~: accept failed");
	 return;
    }

    if (x->x_socket > 0) {
         sys_addpollfn(fd, (t_fdpollfn)mp3streamin_recv, x);
         if ( x->x_outunread != 0 )
         {
	   post("mp3streamin~: still have some data to decode, retry later you %s.", 
                 inet_ntoa( incomer_address.sin_addr ));
           mp3streamin_closesocket( fd );
           return;
         }
	 post("mp3streamin~: the source has changed to %s.", 
               inet_ntoa( incomer_address.sin_addr ));
	 mp3streamin_closesocket(x->x_socket);
    }

    x->x_socket = fd;
    sys_addpollfn(x->x_socket, (t_fdpollfn)mp3streamin_recv, x);
    outlet_symbol( x->x_connectionip, gensym( inet_ntoa( incomer_address.sin_addr) ) );

    if ( x->x_graphic && glist_isvisible( x->x_canvas ) )
    {
      t_int width;
 
       width = rtext_width( glist_findrtext( (t_glist*)x->x_canvas, (t_text *)x ) );
       sys_vgui(".x%x.c create rectangle %d %d %d %d -fill lightblue -tags %xPBAR\n",
              x->x_canvas, x->x_obj.te_xpix, x->x_obj.te_ypix-BARHEIGHT-1,
                  x->x_obj.te_xpix + width, x->x_obj.te_ypix - 1, x );
    }
    x->x_stream = 0;
    x->x_newstream = 1;

}


static int mp3streamin_startservice(t_mp3streamin* x, int portno)
{
    struct sockaddr_in server;
    int sockfd;

    /* create a socket */
    sockfd = socket(AF_INET, SOCK_STREAM, 0);

    if (sockfd < 0)
    {
    	sys_sockerror("socket");
    	return (0);
    }
    server.sin_family = AF_INET;
    server.sin_addr.s_addr = INADDR_ANY;

    /* assign server port number */
    server.sin_port = htons((u_short)portno);
    post("listening to port number %d", portno);

    setsocketoptions(sockfd);

    /* name the socket */
    if (bind(sockfd, (struct sockaddr *)&server, sizeof(server)) < 0) {
	 sys_sockerror("bind");
	 mp3streamin_closesocket(sockfd);
	 return (0);
    }

    if (listen(sockfd, 5) < 0) {
      sys_sockerror("listen");
      mp3streamin_closesocket(sockfd);
    }
    else 
    {
      x->x_serversocket = sockfd;
      sys_addpollfn(x->x_serversocket, (t_fdpollfn)mp3streamin_acceptconnection, x);
    }
    
    return 1;
}

static void mp3streamin_free(t_mp3streamin *x)
{
     post( "mp3streamin~ : free %x", x );
     if (x->x_serversocket > 0) {
        post( "mp3streamin~ : closing server socket" );
	mp3streamin_closesocket(x->x_serversocket);
        x->x_serversocket = -1;
     }
     if (x->x_socket > 0) {
        post( "mp3streamin~ : closing socket" );
        mp3streamin_closesocket(x->x_socket);
        x->x_socket = -1;
     }
     if ( x->x_inbuffer ) freebytes( x->x_inbuffer, x->x_inbuffersize );
     if ( x->x_outbuffer ) freebytes( x->x_outbuffer, x->x_outbuffersize*sizeof(t_float) );
     if ( x->x_instance == nbinstances-1 )
     {
        nbinstances--;
     }
}

static t_int *mp3streamin_perform(t_int *w)
{
     t_mp3streamin *x = (t_mp3streamin*) (w[1]);
     t_float *out1 = (t_float *)(w[2]);
     t_float *out2 = (t_float *)(w[3]);
     int n = (int)(w[4]);
     int bsize = n;
     int ret;
     int i = 0;

     while( n-- )
     {
         if ( ( ( x->x_outunread > MIN_AUDIO_INPUT ) && x->x_newstream ) || // wait the buffer to load
              ( ( x->x_shutdown ) && ( x->x_outunread >= 2 ) ) ||  // clean disconnection
              ( x->x_stream ) // check that the stream provides enough data
            )
         {
            if ( x->x_newstream && !x->x_shutdown )
            {
               x->x_newstream = 0;
               x->x_stream = 1;
            }
            *out1++=*(x->x_outbuffer+x->x_outreadposition);
            x->x_outreadposition = (x->x_outreadposition + 1)%x->x_outbuffersize;
            *out2++=*(x->x_outbuffer+x->x_outreadposition);
            x->x_outreadposition = (x->x_outreadposition + 1)%x->x_outbuffersize;
            x->x_outunread-=2;
            if ( n == 1 ) x->x_pblocks++;
         }
         else
         {
            *out1++=0.0;
            *out2++=0.0;
         }
     }

     if ( ( x->x_outunread <= MIN_AUDIO_INPUT/10  ) && ( x->x_stream ) )
     {
           post( "mp3streamin~ : stream lost (too little input)" );
           x->x_stream = 0;
           x->x_newstream = 1; // waiting for a new stream
     }

     if ( x->x_pblocks == LAME_AUDIO_CHUNK_SIZE/bsize ) 
     {
        x->x_inpackets--;
        x->x_pblocks = 0;
     }

#ifdef DO_MY_OWN_SELECT
     // check new incoming data
     if ( x->x_socket > 0 )
     {
       fd_set readset;
       fd_set exceptset;

         FD_ZERO(&readset);
         FD_ZERO(&exceptset);
         FD_SET(x->x_socket, &readset );
         FD_SET(x->x_socket, &exceptset );

         if ( select( maxfd+1, &readset, NULL, &exceptset, &ztout ) >0 )
         {
           if ( FD_ISSET( x->x_socket, &readset) || FD_ISSET( x->x_socket, &exceptset ) )
           {
              /* receive data or error and decode it */
              mp3streamin_recv(x);
           }
         }
     }
#endif
     return (w+5);
}

static void mp3streamin_dsp(t_mp3streamin *x, t_signal **sp)
{
    dsp_add(mp3streamin_perform, 4, x, sp[0]->s_vec, sp[1]->s_vec, sp[0]->s_n);
}


static void *mp3streamin_new(t_floatarg fportno, t_floatarg fdographics)
{
    t_mp3streamin *x;
    int i;
    
    if ( fportno < 0 || fportno > 65535 )
    {
       post( "mp3streamin~ : error : wrong portnumber : %d", (int)fportno );
       return NULL;
    }
    if ( ((int)fdographics != 0) && ((int)fdographics != 1.) )
    {
       post( "mp3streamin~ : error : constructor : mp3streamin~ <portnumber> [graphic flag = 0 | 1 ] ( got = %f)", fdographics );
       return NULL;
    }

    x = (t_mp3streamin *)pd_new(mp3streamin_class);
    post( "mp3streamin~ : new %x (instance = %d) %d", x, nbinstances, sizeof( MPSTR ) );
    outlet_new(&x->x_obj, &s_signal);
    outlet_new(&x->x_obj, &s_signal);
    x->x_connectionip = outlet_new(&x->x_obj, &s_symbol);
    
    x->x_serversocket = -1;
    x->x_socket = -1;
    x->x_shutdown = 0;
    x->x_inpackets = 0;
    x->x_dpacket = -1;

    x->x_canvas = canvas_getcurrent();

    x->x_inbuffersize = INPUT_BUFFER_SIZE;
    x->x_outbuffersize = OUTPUT_BUFFER_SIZE; 
    x->x_inbuffer = (char*) getbytes( x->x_inbuffersize );
    memset( x->x_inbuffer, 0x0, INPUT_BUFFER_SIZE );
    x->x_outbuffer = (t_float*) getbytes( x->x_outbuffersize*sizeof(t_float) );
    memset( x->x_outbuffer, 0x0, OUTPUT_BUFFER_SIZE );

    if ( !x->x_inbuffer || !x->x_outbuffer )
    {
       post( "mp3streamin~ : could not allocate buffers." );
       return NULL;
    }

    if ( nbinstances < MAX_DECODERS ) 
    {
       x->x_instance = nbinstances++;
    }
    else
    {
       post( "mp3streamin~ : cannot create more decoders (memory issues), sorry" );
       return NULL;
    }

    x->x_inwriteposition = 0;
    x->x_outreadposition = 0;
    x->x_outwriteposition = 0;
    x->x_outunread = 0;
    
    ztout.tv_sec = 0;
    ztout.tv_usec = 0;

    x->x_graphic = (int)fdographics;

    post( "mp3streamin~ : starting service on port %d", (int)fportno );
    mp3streamin_startservice(x, (int)fportno);

    // init lame decoder
    mp3streamin_tilde_mpglib_init(x);

    return (x);
}


void mp3streamin_tilde_setup(void)
{
    post( mp3streamin_version );
    mp3streamin_class = class_new(gensym("mp3streamin~"), 
    	(t_newmethod) mp3streamin_new, (t_method) mp3streamin_free,
    	sizeof(t_mp3streamin),  CLASS_NOINLET, A_DEFFLOAT, A_DEFFLOAT, A_NULL);

    class_addmethod(mp3streamin_class, nullfn, gensym("signal"), 0);
    class_addmethod(mp3streamin_class, (t_method) mp3streamin_dsp, gensym("dsp"), 0);
}