aboutsummaryrefslogtreecommitdiff
path: root/scratcher~/scratcher~.c
blob: b98820685d2e51653f450dd5977677d8081ba10c (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
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
/*------------------------ scratcher~ ------------------------------------------ */
/*                                                                              */
/* scratcher~ : lets you record, and then, scratch a sound.                     */
/* constructor : scratcher~                                                     */
/*                                                                              */
/* Copyleft Yves Degoyon ( 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.                             */
/*                                                                              */
/* "I've lost my kids and wife"                                                 */
/* "Because I got high da da dap da da dap"                                     */
/* Afro Man -- Because I Got High                                               */
/* ---------------------------------------------------------------------------- */



#include <sys/types.h>
#include <string.h>
#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
#include <fcntl.h>
#include <sys/stat.h>
#ifdef __APPLE__  
#include <sys/malloc.h>  
#else
#include <malloc.h>
#endif
#include <ctype.h>
#include <pthread.h>
#include <time.h>
#include <sys/time.h>
#ifdef UNIX
#include <unistd.h>
#endif
#ifdef NT
#define M_PI 3.14159265358979323846
#endif
#include <math.h>

#include "m_pd.h"
#include "m_imp.h"
#include "g_canvas.h"


static int guidebug=0;
static int ignorevisible=1; // ignore visible test
                         // because this seems to lead to bad refresh
                         // wait for a fix                            

#define SYS_VGUI2(a,b) if (guidebug) \
                         post(a,b);\
                         sys_vgui(a,b)

#define SYS_VGUI3(a,b,c) if (guidebug) \
                         post(a,b,c);\
                         sys_vgui(a,b,c)

#define SYS_VGUI4(a,b,c,d) if (guidebug) \
                         post(a,b,c,d);\
                         sys_vgui(a,b,c,d)

#define SYS_VGUI5(a,b,c,d,e) if (guidebug) \
                         post(a,b,c,d,e);\
                         sys_vgui(a,b,c,d,e)

#define SYS_VGUI6(a,b,c,d,e,f) if (guidebug) \
                         post(a,b,c,d,e,f);\
                         sys_vgui(a,b,c,d,e,f)

#define SYS_VGUI7(a,b,c,d,e,f,g) if (guidebug) \
                         post(a,b,c,d,e,f,g );\
                         sys_vgui(a,b,c,d,e,f,g)

#define SYS_VGUI8(a,b,c,d,e,f,g,h) if (guidebug) \
                         post(a,b,c,d,e,f,g,h);\
                         sys_vgui(a,b,c,d,e,f,g,h)

#define SYS_VGUI9(a,b,c,d,e,f,g,h,i) if (guidebug) \
                         post(a,b,c,d,e,f,g,h,i );\
                         sys_vgui(a,b,c,d,e,f,g,h,i)

#define SYS_VGUI10(a,b,c,d,e,f,g,h,i,j) if (guidebug) \
                         post(a,b,c,d,e,f,g,h,i,j );\
                         sys_vgui(a,b,c,d,e,f,g,h,i,j)

#define SYS_VGUI11(a,b,c,d,e,f,g,h,i,j,k) if (guidebug) \
                         post(a,b,c,d,e,f,g,h,i,j,k );\
                         sys_vgui(a,b,c,d,e,f,g,h,i,j,k)

#define DEFAULT_SCRATCHER_SIZE 88200   // 2 seconds at 44100 hertz
#define DEFAULT_SCRATCHER_WIDTH 200  
#define DEFAULT_SCRATCHER_HEIGHT 200  
#define DEFAULT_SCRATCHER_SENSIBILITY 25  
#define DEFAULT_SCRATCHER_MAX_SPEED 2.0
#define DEFAULT_TURNTABLE_INERTIA 0.01  

#define SCRATCHER_NB_GROOVES 20  
#define SCRATCHER_MOVE_TIMEOUT 20

static char   *scratcher_version = "scratcher~: version 0.10, written by Yves Degoyon (ydegoyon@free.fr)";

static t_class *scratcher_class;
t_widgetbehavior scratcher_widgetbehavior;

typedef struct _scratcher
{
    t_object x_obj;

    t_int x_size;                  /* size of the recorded sound ( in samples ) */
    t_float x_samplerate;          /* sample rate */
    t_int x_blocksize;             /* current block size ( might be modified by block~ object ) */
    t_float x_readpos;             /* data's playing position */
    t_int x_writepos;              /* data's recording position */
    t_int x_play;                  /* playing on/off flag */
    t_float x_readspeed;           /* number of grouped blocks for reading */
    t_float x_maxspeed;            /* maximum speed limit                  */
    t_float x_record;              /* flag to start recording process */
    t_int x_empty;                 /* flag to indicate it's a brand new scratcher   */
    t_float x_speedinc;            /* speed increment                               */
    long long x_lastmovetime;      /* instant ( in ms ) of the last movement        */
    t_float *x_sdata;              /* sound data                                */
    t_int   x_sensibility;         /* sensibility ( amount of change for a dy ) */
    t_int   x_motioned;            /* flag to indicate the mouse motion         */
    t_int   x_mousemoved;          /* flag to indicate the mouse movement       */
    t_float x_inertia;             /* turntable inertia                         */

           /* graphical data block */
    t_int x_selected;              /* flag to remember if we are seleted or not   */
    t_int x_width;                 /* width of the graphical object               */
    t_int x_height;                /* height of the graphical object              */
    t_int x_showspeed;             /* toggle on/off speed line                    */
    t_glist *x_glist;              /* keep graphic context for various operations */

    t_float x_f;                   /* float needed for signal input */

} t_scratcher;

/* ------------------------ drawing functions ---------------------------- */

static void scratcher_draw_new(t_scratcher *x, t_glist *glist)
{
  t_canvas *canvas=glist_getcanvas(glist);
  t_int ci;

    SYS_VGUI7(".x%x.c create oval %d %d %d %d -fill #000000 -tags %xSCRATCHER\n",
	     canvas, text_xpix(&x->x_obj, glist), text_ypix(&x->x_obj, glist),
	     text_xpix(&x->x_obj, glist) + x->x_width, 
             text_ypix(&x->x_obj, glist) + x->x_height,
	     x);
    for ( ci=0; ci<SCRATCHER_NB_GROOVES; ci ++)
    {
      SYS_VGUI8(".x%x.c create oval %d %d %d %d -outline #FFFFFF -tags %xGROOVE%d\n",
	     canvas, text_xpix(&x->x_obj, glist) + ci*x->x_width/(2*SCRATCHER_NB_GROOVES), 
             text_ypix(&x->x_obj, glist) + ci*x->x_height/(2*SCRATCHER_NB_GROOVES),
	     text_xpix(&x->x_obj, glist) + x->x_width - ci*x->x_width/(2*SCRATCHER_NB_GROOVES), 
             text_ypix(&x->x_obj, glist) + x->x_height - ci*x->x_height/(2*SCRATCHER_NB_GROOVES),
	     x, ci);
    }
    if ( x->x_showspeed )
    {
       SYS_VGUI7( ".x%x.c create line %d %d %d %d -fill #FF0000 -tags %xSPEEDBAR -width 3\n",
               canvas, text_xpix(&x->x_obj, glist)+x->x_width/2,
               text_ypix(&x->x_obj, glist)+x->x_height/2,
               text_xpix(&x->x_obj, glist)+x->x_width/2 + (int)(x->x_width/2*cos( x->x_readspeed - 1. )),
               text_ypix(&x->x_obj, glist)+x->x_height/2 - (int)(x->x_width/2*sin( x->x_readspeed - 1. )), 
               x );
    }
    SYS_VGUI7(".x%x.c create rectangle %d %d %d %d -tags %xFSCRATCHER\n",
	     canvas, text_xpix(&x->x_obj, glist), text_ypix(&x->x_obj, glist),
	     text_xpix(&x->x_obj, glist) + x->x_width, 
             text_ypix(&x->x_obj, glist) + x->x_height,
	     x);
    canvas_fixlinesfor( canvas, (t_text*)x );
}

static void scratcher_draw_delete(t_scratcher *x, t_glist *glist)
{
  t_int ci;
  t_canvas *canvas=glist_getcanvas(glist);

    if ( glist_isvisible( glist ) )
    {
       SYS_VGUI3( ".x%x.c delete %xSCRATCHER\n", canvas, x );
       SYS_VGUI3( ".x%x.c delete %xFSCRATCHER\n", canvas, x );
       SYS_VGUI3( ".x%x.c delete %xSPEEDBAR\n", canvas, x );
       for ( ci=0; ci<SCRATCHER_NB_GROOVES; ci ++)
       {
          SYS_VGUI4( ".x%x.c delete %xGROOVE%d\n", canvas, x, ci );
       }
    }
}

static void scratcher_draw_move(t_scratcher *x, t_glist *glist)
{
  t_canvas *canvas=glist_getcanvas(glist);
  t_int ci;

   if ( glist_isvisible( x->x_glist ) )
   {
    SYS_VGUI7(".x%x.c coords %xSCRATCHER %d %d %d %d\n",
	     canvas, x,
	     text_xpix(&x->x_obj, glist)-1, text_ypix(&x->x_obj, glist)-1,
	     text_xpix(&x->x_obj, glist)+x->x_width+1, 
             text_ypix(&x->x_obj, glist)+x->x_height+1);
    SYS_VGUI7(".x%x.c coords %xFSCRATCHER %d %d %d %d\n",
	     canvas, x,
	     text_xpix(&x->x_obj, glist)-1, text_ypix(&x->x_obj, glist)-1,
	     text_xpix(&x->x_obj, glist)+x->x_width+1, 
             text_ypix(&x->x_obj, glist)+x->x_height+1);
    if ( x->x_showspeed )
    {
       SYS_VGUI7( ".x%x.c coords %xSPEEDBAR %d %d %d %d\n",
               canvas, x,
               text_xpix(&x->x_obj, glist)+x->x_width/2,
               text_ypix(&x->x_obj, glist)+x->x_height/2,
               text_xpix(&x->x_obj, glist)+x->x_width/2 + (int)(x->x_width/2*cos( x->x_readspeed - 1 )),
               text_ypix(&x->x_obj, glist)+x->x_height/2 - (int)(x->x_width/2*sin( x->x_readspeed - 1 ))
               );
    }
    for ( ci=0; ci<SCRATCHER_NB_GROOVES; ci ++)
    {
      SYS_VGUI8(".x%x.c coords %xGROOVE%d %d %d %d %d\n",
	     canvas, x, ci,
             text_xpix(&x->x_obj, glist) + ci*x->x_width/(2*SCRATCHER_NB_GROOVES), 
             text_ypix(&x->x_obj, glist) + ci*x->x_height/(2*SCRATCHER_NB_GROOVES),
	     text_xpix(&x->x_obj, glist) + x->x_width - ci*x->x_width/(2*SCRATCHER_NB_GROOVES), 
             text_ypix(&x->x_obj, glist) + x->x_height - ci*x->x_height/(2*SCRATCHER_NB_GROOVES)
	     );
    }
    canvas_fixlinesfor( canvas, (t_text*)x );
   }
}

static void scratcher_draw_select(t_scratcher* x,t_glist* glist)
{
   t_canvas *canvas=glist_getcanvas(glist);

   if ( glist_isvisible( x->x_glist ) )
   {
    if(x->x_selected)
    {
    }
    else
    {
    }
   }
}

/* ------------------------ widget callbacks ----------------------------- */


static void scratcher_getrect(t_gobj *z, t_glist *owner,
			    int *xp1, int *yp1, int *xp2, int *yp2)
{
   t_scratcher* x = (t_scratcher*)z;

   *xp1 = text_xpix(&x->x_obj, owner);
   *yp1 = text_ypix(&x->x_obj, owner);
   *xp2 = text_xpix(&x->x_obj, owner)+x->x_width;
   *yp2 = text_ypix(&x->x_obj, owner)+x->x_height;
}

static void scratcher_save(t_gobj *z, t_binbuf *b)
{
   t_scratcher *x = (t_scratcher *)z;

   binbuf_addv(b, "ssiisiiiiff", gensym("#X"),gensym("obj"),
		(t_int)x->x_obj.te_xpix, (t_int)x->x_obj.te_ypix,
		atom_getsymbol(binbuf_getvec(x->x_obj.te_binbuf)),
        x->x_size, x->x_width, x->x_height, 
                x->x_sensibility, x->x_maxspeed, x->x_inertia );
   binbuf_addv(b, ";");
}

static void scratcher_select(t_gobj *z, t_glist *glist, int selected)
{
   t_scratcher *x = (t_scratcher *)z;

   x->x_selected = selected;
   scratcher_draw_select( x, glist );
}

static void scratcher_vis(t_gobj *z, t_glist *glist, int vis)
{
   t_scratcher *x = (t_scratcher *)z;
   t_rtext *y;

   if (vis)
   {
      scratcher_draw_new( x, glist );
   }
   else
   {
      scratcher_draw_delete( x, glist );
   }
}

static void scratcher_delete(t_gobj *z, t_glist *glist)
{
    canvas_deletelinesfor( glist_getcanvas(glist), (t_text *)z);
}

static void scratcher_displace(t_gobj *z, t_glist *glist, int dx, int dy)
{
  t_scratcher *x = (t_scratcher *)z;

    x->x_obj.te_xpix += dx;
    x->x_obj.te_ypix += dy;

    scratcher_draw_move( x, glist );
}

static void scratcher_motion(t_scratcher *x, t_floatarg dx, t_floatarg dy)
{
  struct timeval tv;
  struct timezone tz;
  t_canvas *canvas=glist_getcanvas(x->x_glist);

   // post( "scratcher_motion dx=%f dy=%f", dx, dy );

   x->x_speedinc += dy / x->x_sensibility;

   x->x_mousemoved = 1;
   // get current time in ms
   gettimeofday( &tv, &tz );
   x->x_lastmovetime = tv.tv_sec*1000 + tv.tv_usec/1000;
   // post( "scratcher~ : move time : %ld", x->x_lastmovetime );

   if ( x->x_showspeed )
   {
      SYS_VGUI7( ".x%x.c coords %xSPEEDBAR %d %d %d %d\n",
              canvas, x,
              text_xpix(&x->x_obj, x->x_glist)+x->x_width/2,
              text_ypix(&x->x_obj, x->x_glist)+x->x_height/2,
              text_xpix(&x->x_obj, x->x_glist)+x->x_width/2 + (int)(x->x_width/2*cos( x->x_readspeed - 1 )),
              text_ypix(&x->x_obj, x->x_glist)+x->x_height/2 - (int)(x->x_width/2*sin( x->x_readspeed - 1 ))
              );
   }
}

static void scratcher_properties(t_gobj *z, t_glist *owner)
{
   char buf[800];
   t_scratcher *x=(t_scratcher *)z;

   sprintf(buf, "pdtk_scratcher_dialog %%s %d %d\n",
            x->x_width, x->x_height );
   // post("scratcher_properties : %s", buf );
   gfxstub_new(&x->x_obj.ob_pd, x, buf);
}

static void scratcher_dialog(t_scratcher *x, t_symbol *s, int argc, t_atom *argv)
{
   if ( !x ) {
     post( "scratcher : error :tried to set properties on an unexisting object" );
   }
   if ( argc != 2 )
   {
      post( "scratcher : error in the number of arguments ( %d instead of 2 )", argc );
      return;
   }
   if ( argv[0].a_type != A_FLOAT || argv[1].a_type != A_FLOAT ) {
      post( "scratcher : wrong arguments" );
      return;
   }
   x->x_width = (int)argv[0].a_w.w_float;
   x->x_height = (int)argv[1].a_w.w_float;
   scratcher_draw_delete(x, x->x_glist);
   scratcher_draw_new(x, x->x_glist);
}

    /* reset reading speed */
static void scratcher_reset(t_scratcher *x)
{
 t_canvas *canvas=glist_getcanvas(x->x_glist);

   x->x_readspeed=1.;
   if ( x->x_showspeed )
   {
      SYS_VGUI7( ".x%x.c coords %xSPEEDBAR %d %d %d %d\n",
              canvas, x,
              text_xpix(&x->x_obj, x->x_glist)+x->x_width/2,
              text_ypix(&x->x_obj, x->x_glist)+x->x_height/2,
              text_xpix(&x->x_obj, x->x_glist)+x->x_width/2 + (int)(x->x_width/2*cos( x->x_readspeed - 1 )),
              text_ypix(&x->x_obj, x->x_glist)+x->x_height/2 - (int)(x->x_width/2*sin( x->x_readspeed - 1 ))
              );
   }
}

static int scratcher_click(t_gobj *z, struct _glist *glist,
			    int xpix, int ypix, int shift, int alt, int dbl, int doit)
{
 t_scratcher* x = (t_scratcher *)z;
 t_canvas *canvas=glist_getcanvas(x->x_glist);

    // post( "scratcher_click : x=%d y=%d doit=%d alt=%d, shift=%d", xpix, ypix, doit, alt, shift );
    if ( doit )
    {
      // activate motion callback
      glist_grab( glist, &x->x_obj.te_g, (t_glistmotionfn)scratcher_motion,
                  0, xpix, ypix );
      x->x_readspeed=0.;
      x->x_motioned = 1;
      if ( x->x_showspeed )
      {
        SYS_VGUI7( ".x%x.c coords %xSPEEDBAR %d %d %d %d\n",
              canvas, x,
              text_xpix(&x->x_obj, glist)+x->x_width/2,
              text_ypix(&x->x_obj, glist)+x->x_height/2,
              text_xpix(&x->x_obj, glist)+x->x_width/2 + (int)(x->x_width/2*cos( x->x_readspeed - 1 )),
              text_ypix(&x->x_obj, glist)+x->x_height/2 - (int)(x->x_width/2*sin( x->x_readspeed - 1 ))
              );
      }
    }
    else
    {
      if ( x->x_play ) scratcher_reset(x);
      x->x_motioned = 0;
    }
    return (1);
}

	/* clean up */
static void scratcher_free(t_scratcher *x)    
{
    if ( x->x_sdata != NULL ) {
       freebytes(x->x_sdata, x->x_size*sizeof(t_float) );
       post( "scratcher~ : freed %d bytes", x->x_size*sizeof(t_float) );
       x->x_sdata = NULL;
    }
}

    /* allocate tables for storing sample data */
static t_int scratcher_allocate(t_scratcher *x)
{
    if ( !(x->x_sdata = getbytes( x->x_size*sizeof(float) ) ) ) {
       post( "scratcher~ : could not allocate %d bytes", x->x_size*sizeof(t_float) );
       return -1;
    } else {
       post( "scratcher~ : allocated %d bytes", x->x_size*sizeof(t_float) );
    }
    return 0;
}

    /* reallocate tables for storing sample data */
static t_int scratcher_reallocate(t_scratcher *x, t_int ioldsize, t_int inewsize)
{
  t_float *pdata;

    pdata = x->x_sdata;
    if ( !(x->x_sdata = getbytes( inewsize*sizeof(float) ) ) ) {
       post( "scratcher~ : could not allocate %d bytes", inewsize*sizeof(t_float) );
       return -1;
    } else {
       post( "scratcher~ : allocated %d bytes", inewsize*sizeof(t_float) );
    }
    if ( pdata != NULL ) {
       freebytes(pdata, ioldsize*sizeof(t_float) );
       post( "scratcher~ : freed %d bytes", ioldsize*sizeof(t_float) );
    }
    return 0;
}

    /* records or playback the scratcher */
static t_int *scratcher_perform(t_int *w)
{
  t_float *in = (t_float *)(w[1]);
  t_float *out = (t_float *)(w[2]);
  t_int n = (int)(w[3]);                      /* number of samples */
  t_scratcher *x = (t_scratcher *)(w[4]);
  struct timeval tv;
  struct timezone tz;
  long long perftime = 0L;
  t_canvas *canvas=glist_getcanvas(x->x_glist);

    x->x_readspeed += x->x_speedinc;
    if ( x->x_readspeed > x->x_maxspeed )
    {
       x->x_readspeed = x->x_maxspeed;
    }
    if ( x->x_readspeed < -x->x_maxspeed )
    {
       x->x_readspeed = -x->x_maxspeed;
    }
    x->x_speedinc = 0;

    // if the mouse hasn't moved for a certain time, reset speed

    if ( x->x_mousemoved )
    {
       // get current time in ms
       gettimeofday( &tv, &tz );
       perftime = tv.tv_sec*1000 + tv.tv_usec/1000;
       if ( perftime - x->x_lastmovetime > SCRATCHER_MOVE_TIMEOUT )
       {
          // post( "scratcher~ : mouse timeout (m=%ld)", perftime );
          // post( "scratcher~ : (m=%ld)", x->x_lastmovetime );
          if ( x->x_readspeed > 0. )
          {
             x->x_readspeed -= x->x_inertia;
             // post( "scratcher~ : dec speed" );
          }
          if ( x->x_readspeed < 0. )
          {
             x->x_readspeed += x->x_inertia;
             // post( "scratcher~ : inc speed" );
          }
          if ( ( x->x_readspeed <= x->x_inertia && x->x_readspeed > 0 ) ||
               ( x->x_readspeed >= -x->x_inertia && x->x_readspeed < 0 ) ) 
          {
             x->x_mousemoved = 0;
             x->x_readspeed = 0.;
          }
          if ( x->x_showspeed )
          {
            SYS_VGUI7( ".x%x.c coords %xSPEEDBAR %d %d %d %d\n",
               canvas, x,
               text_xpix(&x->x_obj, x->x_glist)+x->x_width/2,
               text_ypix(&x->x_obj, x->x_glist)+x->x_height/2,
               text_xpix(&x->x_obj, x->x_glist)+x->x_width/2 + (int)(x->x_width/2*cos( x->x_readspeed - 1 )),
               text_ypix(&x->x_obj, x->x_glist)+x->x_height/2 - (int)(x->x_width/2*sin( x->x_readspeed - 1 ))
               );
          }
        }
    }

    while (n--) {
        // eventually records input
        if ( x->x_record) {
           *(x->x_sdata+x->x_writepos)=*in;
           x->x_writepos++;
           if ( x->x_writepos >= x->x_size ) {
             x->x_record=0;
             x->x_writepos=0;
             if ( x->x_empty ) x->x_empty = 0;
             // post( "scratcher~ : stopped recording" );
           }
        }
        // set outputs
        if ( x->x_play) {
            *out = *(x->x_sdata+(int)x->x_readpos);
            x->x_readpos+=x->x_readspeed;
            if ( x->x_readpos < 0 ) x->x_readpos = x->x_size-1;
            if ( x->x_readpos >= x->x_size ) x->x_readpos = 0;
        } else {
            *out=0.0;
        }

        in++;out++;
    }

    return (w+5);
}

static void scratcher_dsp(t_scratcher *x, t_signal **sp)
{
   dsp_add(scratcher_perform, 4, sp[0]->s_vec, sp[1]->s_vec, sp[0]->s_n, x);
}

    /* play the sound */
static void scratcher_play(t_scratcher *x)
{
 t_canvas *canvas=glist_getcanvas(x->x_glist);

   x->x_play=1;
   // reset read position
   x->x_readpos=0;
   x->x_readspeed=1.;
   if ( x->x_showspeed )
   {
     SYS_VGUI3( ".x%x.c delete %xSPEEDBAR\n", canvas, x );
     SYS_VGUI7( ".x%x.c create line %d %d %d %d -fill #FF0000 -tags %xSPEEDBAR -width 3\n",
             canvas, text_xpix(&x->x_obj, x->x_glist)+x->x_width/2,
             text_ypix(&x->x_obj, x->x_glist)+x->x_height/2,
             text_xpix(&x->x_obj, x->x_glist)+x->x_width/2 + (int)(x->x_width/2*cos( x->x_readspeed - 1. )),
             text_ypix(&x->x_obj, x->x_glist)+x->x_height/2 - (int)(x->x_width/2*sin( x->x_readspeed - 1. )), 
             x );
   }
}

    /* stop playing   */
static void scratcher_stop(t_scratcher *x)
{
 t_canvas *canvas=glist_getcanvas(x->x_glist);

   x->x_play=0;
   // reset read position
   x->x_readpos=0;
   x->x_readspeed=0.;
   if ( x->x_showspeed )
   {
     SYS_VGUI3( ".x%x.c delete %xSPEEDBAR\n", canvas, x );
     SYS_VGUI7( ".x%x.c create line %d %d %d %d -fill #FF0000 -tags %xSPEEDBAR -width 3\n",
             canvas, text_xpix(&x->x_obj, x->x_glist)+x->x_width/2,
             text_ypix(&x->x_obj, x->x_glist)+x->x_height/2,
             text_xpix(&x->x_obj, x->x_glist)+x->x_width/2 + (int)(x->x_width/2*cos( x->x_readspeed - 1. )),
             text_ypix(&x->x_obj, x->x_glist)+x->x_height/2 - (int)(x->x_width/2*sin( x->x_readspeed - 1. )), 
             x );
   }
}

    /* record the sound */
static void scratcher_record(t_scratcher *x)
{
   scratcher_stop(x);
   x->x_record=1;
   x->x_writepos=0;
}

    /* resize sound */
static void scratcher_resize(t_scratcher *x, t_floatarg fnewsize )
{
  t_int dspstate;   
  struct timespec ts;        

    if (fnewsize <= 0) {
        post( "scratcher~ : error : wrong size" );
        return;
    }
    post( "scratcher~ : reallocating tables" );
    x->x_record = 0;
    x->x_play = 0;

    scratcher_reallocate(x, x->x_size, fnewsize);
    x->x_size = fnewsize;
}

    /* set sensibility */
static void scratcher_sensibility(t_scratcher *x, t_floatarg fsensibility )
{
    if (fsensibility <= 0) {
        post( "scratcher~ : error : wrong sensibility" );
        return;
    }
    x->x_sensibility = fsensibility;
}

    /* set maximum speed */
static void scratcher_maxspeed(t_scratcher *x, t_floatarg fmaxspeed )
{
    if (fmaxspeed < 0) {
        post( "scratcher~ : error : wrong maximum speed" );
        return;
    }
    x->x_maxspeed = fmaxspeed;
}

    /* set turntable inertia */
static void scratcher_inertia(t_scratcher *x, t_floatarg finertia )
{
    if (finertia < 0) {
        post( "scratcher~ : error : wrong inertia" );
        return;
    }
    x->x_inertia = finertia;
}

    /* toggle speed line */
static void scratcher_showspeed(t_scratcher *x, t_floatarg fshowspeed )
{
 t_canvas *canvas=glist_getcanvas(x->x_glist);

    if (fshowspeed == 0) {
      x->x_showspeed = 0;
      SYS_VGUI3( ".x%x.c delete %xSPEEDBAR\n", canvas, x );
    }
    else
    {
      x->x_showspeed = 1;
      SYS_VGUI3( ".x%x.c delete %xSPEEDBAR\n", canvas, x );
      SYS_VGUI7( ".x%x.c create line %d %d %d %d -fill #FF0000 -tags %xSPEEDBAR -width 3\n",
               canvas, text_xpix(&x->x_obj, x->x_glist)+x->x_width/2,
               text_ypix(&x->x_obj, x->x_glist)+x->x_height/2,
               text_xpix(&x->x_obj, x->x_glist)+x->x_width/2 + (int)(x->x_width/2*cos( x->x_readspeed - 1. )),
               text_ypix(&x->x_obj, x->x_glist)+x->x_height/2 - (int)(x->x_width/2*sin( x->x_readspeed - 1. )), 
               x );
    }
}

static void *scratcher_new(t_symbol *s, int argc, t_atom *argv)
{
    t_scratcher *x = (t_scratcher *)pd_new(scratcher_class);
    outlet_new(&x->x_obj, &s_signal);
    
    // new scratcher created from the gui
    if ( argc != 0 )
    {
      if ( argc < 3 )
      {
        post( "scratcher~ : error in the number of arguments ( < 3 )", argc );
        return NULL;
      }
      if ( argv[0].a_type != A_FLOAT || 
           argv[1].a_type != A_FLOAT ||
           argv[2].a_type != A_FLOAT ) {
        post( "scratcher~ : wrong arguments" );
        return NULL;
      }
      x->x_size = argv[0].a_w.w_float;
      x->x_width = argv[1].a_w.w_float;
      x->x_height = argv[2].a_w.w_float;
      if ( argc >= 4 ) 
      {
          x->x_sensibility = argv[3].a_w.w_float;
      }
      else
      {
          x->x_sensibility = DEFAULT_SCRATCHER_SENSIBILITY;
      }
      if ( argc >= 5 ) 
      {
          x->x_maxspeed = argv[4].a_w.w_float;
      }
      else
      {
          x->x_maxspeed = DEFAULT_SCRATCHER_MAX_SPEED;
      }
      if ( argc >= 6 ) 
      {
          x->x_inertia = argv[5].a_w.w_float;
      }
      else
      {
          x->x_inertia = DEFAULT_TURNTABLE_INERTIA;
      }
    }
    else
    {
       x->x_size = DEFAULT_SCRATCHER_SIZE;
       x->x_width = DEFAULT_SCRATCHER_WIDTH;
       x->x_height = DEFAULT_SCRATCHER_HEIGHT;
       x->x_sensibility = DEFAULT_SCRATCHER_SENSIBILITY;
       x->x_maxspeed = DEFAULT_SCRATCHER_MAX_SPEED;
       x->x_inertia = DEFAULT_TURNTABLE_INERTIA;
    }

    x->x_play = 0;
    x->x_record = 0;
    x->x_readspeed = 1.;
    x->x_readpos = 0.;
    x->x_speedinc = 0.;
    x->x_writepos = 0;
    x->x_sdata = NULL;
    x->x_empty = 1;
    x->x_showspeed = 1;
    x->x_mousemoved = 0;
    x->x_lastmovetime = 0L;
    x->x_selected = 0;
    x->x_glist = (t_glist*)canvas_getcurrent();

    // activate graphical callbacks
    class_setwidget(scratcher_class, &scratcher_widgetbehavior);
    
    // post( "scratcher~ : new scratcher : size = %d", x->x_size );
    if ( scratcher_allocate(x) <0 ) {
      return NULL;
    } else {
      return(x);
    }

}

void scratcher_tilde_setup(void)
{
    post(scratcher_version);
#include "scratcher~.tk2c"
    scratcher_class = class_new(gensym("scratcher~"), (t_newmethod)scratcher_new, (t_method)scratcher_free,
                    sizeof(t_scratcher), 0, A_GIMME, 0);
    class_sethelpsymbol( scratcher_class, gensym("scratcher~.pd") );

    // set callbacks
    scratcher_widgetbehavior.w_getrectfn =    scratcher_getrect;
    scratcher_widgetbehavior.w_displacefn =   scratcher_displace;
    scratcher_widgetbehavior.w_selectfn =     scratcher_select;
    scratcher_widgetbehavior.w_activatefn =   NULL;
    scratcher_widgetbehavior.w_deletefn =     scratcher_delete;
    scratcher_widgetbehavior.w_visfn =        scratcher_vis;
    scratcher_widgetbehavior.w_clickfn =      scratcher_click;

#if PD_MINOR_VERSION >= 37
    class_setpropertiesfn(scratcher_class, scratcher_properties);
    class_setsavefn(scratcher_class, scratcher_save);
#else
    scratcher_widgetbehavior.w_propertiesfn = scratcher_properties;
    scratcher_widgetbehavior.w_savefn =       scratcher_save;
#endif

    CLASS_MAINSIGNALIN( scratcher_class, t_scratcher, x_f );
    class_addmethod(scratcher_class, (t_method)scratcher_dsp, gensym("dsp"), A_NULL);
    class_addmethod(scratcher_class, (t_method)scratcher_record, gensym("record"), A_NULL);
    class_addmethod(scratcher_class, (t_method)scratcher_resize, gensym("resize"), A_FLOAT, A_NULL);
    class_addmethod(scratcher_class, (t_method)scratcher_sensibility, gensym("sensibility"), A_FLOAT, A_NULL);
    class_addmethod(scratcher_class, (t_method)scratcher_maxspeed, gensym("maxspeed"), A_FLOAT, A_NULL);
    class_addmethod(scratcher_class, (t_method)scratcher_inertia, gensym("inertia"), A_FLOAT, A_NULL);
    class_addmethod(scratcher_class, (t_method)scratcher_showspeed, gensym("showspeed"), A_FLOAT, A_NULL);
    class_addmethod(scratcher_class, (t_method)scratcher_play, gensym("play"), A_NULL);
    class_addmethod(scratcher_class, (t_method)scratcher_stop, gensym("stop"), A_NULL);
    class_addmethod(scratcher_class, (t_method)scratcher_reset, gensym("reset"), A_NULL);
    class_addmethod(scratcher_class, (t_method)scratcher_dialog, gensym("dialog"), A_GIMME, A_NULL);
}