libs/ardour/panner.cc

   1 /*
   2     Copyright (C) 2004 Paul Davis
   3
   4     This program is free software; you can redistribute it and/or modify
   5     it under the terms of the GNU General Public License as published by
   6     the Free Software Foundation; either version 2 of the License, or
   7     (at your option) any later version.
   8
   9     This program is distributed in the hope that it will be useful,
  10     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12     GNU General Public License for more details.
  13
  14     You should have received a copy of the GNU General Public License
  15     along with this program; if not, write to the Free Software
  16     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17
  18 */
  19
  20 #include <cmath>
  21 #include <cerrno>
  22 #include <fstream>
  23 #include <cstdlib>
  24 #include <string>
  25 #include <cstdio>
  26 #include <locale.h>
  27 #include <unistd.h>
  28 #include <float.h>
  29
  30 #include <glibmm.h>
  31
  32 #include <pbd/error.h>
  33 #include <pbd/failed_constructor.h>
  34 #include <pbd/xml++.h>
  35 #include <pbd/enumwriter.h>
  36
  37 #include <ardour/session.h>
  38 #include <ardour/panner.h>
  39 #include <ardour/utils.h>
  40
  41 #include <ardour/mix.h>
  42
  43 #include "i18n.h"
  44
  45 #include <pbd/mathfix.h>
  46
  47 using namespace std;
  48 using namespace ARDOUR;
  49 using namespace PBD;
  50
  51 float Panner::current_automation_version_number = 1.0;
  52
  53 string EqualPowerStereoPanner::name = "Equal Power Stereo";
  54 string Multi2dPanner::name = "Multiple (2D)";
  55
  56 /* this is a default mapper of  control values to a pan position
  57    others can be imagined.
  58 */
  59
  60 static pan_t direct_control_to_pan (double fract) {
  61         return fract;
  62 }
  63
  64 static double direct_pan_to_control (pan_t val) {
  65         return val;
  66 }
  67
  68 StreamPanner::StreamPanner (Panner& p)
  69         : parent (p),
  70           _control (X_("panner"), *this)
  71 {
  72         _muted = false;
  73
  74         parent.session().add_controllable (&_control);
  75
  76         x = 0.5;
  77         y = 0.5;
  78         z = 0.5;
  79 }
  80
  81 StreamPanner::~StreamPanner ()
  82 {
  83 }
  84
  85 void
  86 StreamPanner::PanControllable::set_value (float val)
  87 {
  88         panner.set_position (direct_control_to_pan (val));
  89 }
  90
  91 float
  92 StreamPanner::PanControllable::get_value (void) const
  93 {
  94         float xpos;
  95         panner.get_effective_position (xpos);
  96         return direct_pan_to_control (xpos);
  97 }
  98
  99 bool
 100 StreamPanner::PanControllable::can_send_feedback () const
 101 {
 102         AutoState astate = panner.get_parent().automation_state ();
 103
 104         if ((astate == Play) || (astate == Touch && !panner.get_parent().touching())) {
 105                 return true;
 106         }
 107
 108         return false;
 109 }
 110
 111 void
 112 StreamPanner::set_muted (bool yn)
 113 {
 114         if (yn != _muted) {
 115                 _muted = yn;
 116                 StateChanged ();
 117         }
 118 }
 119
 120 void
 121 StreamPanner::set_position (float xpos, bool link_call)
 122 {
 123         if (!link_call && parent.linked()) {
 124                 parent.set_position (xpos, *this);
 125         }
 126
 127         if (x != xpos) {
 128                 x = xpos;
 129                 update ();
 130                 Changed ();
 131                 _control.Changed ();
 132         }
 133 }
 134
 135 void
 136 StreamPanner::set_position (float xpos, float ypos, bool link_call)
 137 {
 138         if (!link_call && parent.linked()) {
 139                 parent.set_position (xpos, ypos, *this);
 140         }
 141
 142         if (x != xpos || y != ypos) {
 143
 144                 x = xpos;
 145                 y = ypos;
 146                 update ();
 147                 Changed ();
 148         }
 149 }
 150
 151 void
 152 StreamPanner::set_position (float xpos, float ypos, float zpos, bool link_call)
 153 {
 154         if (!link_call && parent.linked()) {
 155                 parent.set_position (xpos, ypos, zpos, *this);
 156         }
 157
 158         if (x != xpos || y != ypos || z != zpos) {
 159                 x = xpos;
 160                 y = ypos;
 161                 z = zpos;
 162                 update ();
 163                 Changed ();
 164         }
 165 }
 166
 167 int
 168 StreamPanner::set_state (const XMLNode& node)
 169 {
 170         const XMLProperty* prop;
 171         XMLNodeConstIterator iter;
 172
 173         if ((prop = node.property (X_("muted")))) {
 174                 set_muted (prop->value() == "yes");
 175         }
 176
 177         return 0;
 178 }
 179
 180 void
 181 StreamPanner::add_state (XMLNode& node)
 182 {
 183         node.add_property (X_("muted"), (muted() ? "yes" : "no"));
 184 }
 185
 186 /*---------------------------------------------------------------------- */
 187
 188 BaseStereoPanner::BaseStereoPanner (Panner& p)
 189         : StreamPanner (p), _automation (0.0, 1.0, 0.5)
 190 {
 191 }
 192
 193 BaseStereoPanner::~BaseStereoPanner ()
 194 {
 195 }
 196
 197 void
 198 BaseStereoPanner::snapshot (nframes_t now)
 199 {
 200         if (_automation.automation_state() == Write || _automation.automation_state() == Touch) {
 201                 _automation.rt_add (now, x);
 202         }
 203 }
 204
 205 void
 206 BaseStereoPanner::transport_stopped (nframes_t frame)
 207 {
 208         if (_automation.automation_state() != Off) {
 209                 set_position (_automation.eval (frame));
 210         }
 211
 212         _automation.reposition_for_rt_add (frame);
 213 }
 214
 215 void
 216 BaseStereoPanner::set_automation_style (AutoStyle style)
 217 {
 218         _automation.set_automation_style (style);
 219 }
 220
 221 void
 222 BaseStereoPanner::set_automation_state (AutoState state)
 223 {
 224         if (state != _automation.automation_state()) {
 225
 226                 _automation.set_automation_state (state);
 227
 228                 if (state != Off) {
 229                         set_position (_automation.eval (parent.session().transport_frame()));
 230                 }
 231         }
 232 }
 233
 234 int
 235 BaseStereoPanner::load (istream& in, string path, uint32_t& linecnt)
 236 {
 237         char line[128];
 238         LocaleGuard lg (X_("POSIX"));
 239
 240         _automation.clear ();
 241
 242         while (in.getline (line, sizeof (line), '\n')) {
 243                 jack_nframes_t when;
 244                 double value;
 245
 246                 ++linecnt;
 247
 248                 if (strcmp (line, "end") == 0) {
 249                         break;
 250                 }
 251
 252                 if (sscanf (line, "%" PRIu32 " %lf", &when, &value) != 2) {
 253                         warning << string_compose(_("badly formatted pan automation event record at line %1 of %2 (ignored) [%3]"), linecnt, path, line) << endmsg;
 254                         continue;
 255                 }
 256
 257                 _automation.fast_simple_add (when, value);
 258         }
 259
 260         /* now that we are done loading */
 261
 262         _automation.StateChanged ();
 263
 264         return 0;
 265 }
 266
 267 void
 268 BaseStereoPanner::distribute (Sample* src, Sample** obufs, gain_t gain_coeff, nframes_t nframes)
 269 {
 270         pan_t delta;
 271         Sample* dst;
 272         pan_t pan;
 273
 274         if (_muted) {
 275                 return;
 276         }
 277
 278         /* LEFT */
 279
 280         dst = obufs[0];
 281
 282         if (fabsf ((delta = (left - desired_left))) > 0.002) { // about 1 degree of arc
 283
 284                 /* interpolate over 64 frames or nframes, whichever is smaller */
 285
 286                 nframes_t limit = min ((nframes_t)64, nframes);
 287                 nframes_t n;
 288
 289                 delta = -(delta / (float) (limit));
 290
 291                 for (n = 0; n < limit; n++) {
 292                         left_interp = left_interp + delta;
 293                         left = left_interp + 0.9 * (left - left_interp);
 294                         dst[n] += src[n] * left * gain_coeff;
 295                 }
 296
 297                 pan = left * gain_coeff;
 298
 299                 Session::mix_buffers_with_gain(dst+n,src+n,nframes-n,pan);
 300
 301         } else {
 302
 303                 left = desired_left;
 304                 left_interp = left;
 305
 306                 if ((pan = (left * gain_coeff)) != 1.0f) {
 307
 308                         if (pan != 0.0f) {
 309
 310                                 Session::mix_buffers_with_gain(dst,src,nframes,pan);
 311
 312                                 /* mark that we wrote into the buffer */
 313
 314                                 // obufs[0] = 0;
 315
 316                         }
 317
 318                 } else {
 319
 320                         Session::mix_buffers_no_gain(dst,src,nframes);
 321
 322                         /* mark that we wrote into the buffer */
 323
 324                         // obufs[0] = 0;
 325                 }
 326         }
 327
 328         /* RIGHT */
 329
 330         dst = obufs[1];
 331
 332         if (fabsf ((delta = (right - desired_right))) > 0.002) { // about 1 degree of arc
 333
 334                 /* interpolate over 64 frames or nframes, whichever is smaller */
 335
 336                 nframes_t limit = min ((nframes_t)64, nframes);
 337                 nframes_t n;
 338
 339                 delta = -(delta / (float) (limit));
 340
 341                 for (n = 0; n < limit; n++) {
 342                         right_interp = right_interp + delta;
 343                         right = right_interp + 0.9 * (right - right_interp);
 344                         dst[n] += src[n] * right * gain_coeff;
 345                 }
 346
 347                 pan = right * gain_coeff;
 348
 349                 Session::mix_buffers_with_gain(dst+n,src+n,nframes-n,pan);
 350
 351                 /* XXX it would be nice to mark the buffer as written to */
 352
 353         } else {
 354
 355                 right = desired_right;
 356                 right_interp = right;
 357
 358                 if ((pan = (right * gain_coeff)) != 1.0f) {
 359
 360                         if (pan != 0.0f) {
 361
 362                                 Session::mix_buffers_with_gain(dst,src,nframes,pan);
 363
 364                                 /* XXX it would be nice to mark the buffer as written to */
 365                         }
 366
 367                 } else {
 368
 369                         Session::mix_buffers_no_gain(dst,src,nframes);
 370
 371                         /* XXX it would be nice to mark the buffer as written to */
 372                 }
 373         }
 374 }
 375
 376 /*---------------------------------------------------------------------- */
 377
 378 EqualPowerStereoPanner::EqualPowerStereoPanner (Panner& p)
 379         : BaseStereoPanner (p)
 380 {
 381         update ();
 382
 383         left = desired_left;
 384         right = desired_right;
 385         left_interp = left;
 386         right_interp = right;
 387 }
 388
 389 EqualPowerStereoPanner::~EqualPowerStereoPanner ()
 390 {
 391 }
 392
 393 void
 394 EqualPowerStereoPanner::update ()
 395 {
 396         /* it would be very nice to split this out into a virtual function
 397            that can be accessed from BaseStereoPanner and used in distribute_automated().
 398
 399            but the place where its used in distribute_automated() is a tight inner loop,
 400            and making "nframes" virtual function calls to compute values is an absurd
 401            overhead.
 402         */
 403
 404         /* x == 0 => hard left
 405            x == 1 => hard right
 406         */
 407
 408         float panR = x;
 409         float panL = 1 - panR;
 410
 411         const float pan_law_attenuation = -3.0f;
 412         const float scale = 2.0f - 4.0f * powf (10.0f,pan_law_attenuation/20.0f);
 413
 414         desired_left = panL * (scale * panL + 1.0f - scale);
 415         desired_right = panR * (scale * panR + 1.0f - scale);
 416
 417         effective_x = x;
 418 }
 419
 420 void
 421 EqualPowerStereoPanner::distribute_automated (Sample* src, Sample** obufs,
 422                                               nframes_t start, nframes_t end, nframes_t nframes,
 423                                               pan_t** buffers)
 424 {
 425         Sample* dst;
 426         pan_t* pbuf;
 427
 428         /* fetch positional data */
 429
 430         if (!_automation.rt_safe_get_vector (start, end, buffers[0], nframes)) {
 431                 /* fallback */
 432                 if (!_muted) {
 433                         distribute (src, obufs, 1.0, nframes);
 434                 }
 435                 return;
 436         }
 437
 438         /* store effective pan position. do this even if we are muted */
 439
 440         if (nframes > 0)
 441                 effective_x = buffers[0][nframes-1];
 442
 443         if (_muted) {
 444                 return;
 445         }
 446
 447         /* apply pan law to convert positional data into pan coefficients for
 448            each buffer (output)
 449         */
 450
 451         const float pan_law_attenuation = -3.0f;
 452         const float scale = 2.0f - 4.0f * powf (10.0f,pan_law_attenuation/20.0f);
 453
 454         for (nframes_t n = 0; n < nframes; ++n) {
 455
 456                 float panR = buffers[0][n];
 457                 float panL = 1 - panR;
 458
 459                 buffers[0][n] = panL * (scale * panL + 1.0f - scale);
 460                 buffers[1][n] = panR * (scale * panR + 1.0f - scale);
 461         }
 462
 463         /* LEFT */
 464
 465         dst = obufs[0];
 466         pbuf = buffers[0];
 467
 468         for (nframes_t n = 0; n < nframes; ++n) {
 469                 dst[n] += src[n] * pbuf[n];
 470         }
 471
 472         /* XXX it would be nice to mark the buffer as written to */
 473
 474         /* RIGHT */
 475
 476         dst = obufs[1];
 477         pbuf = buffers[1];
 478
 479         for (nframes_t n = 0; n < nframes; ++n) {
 480                 dst[n] += src[n] * pbuf[n];
 481         }
 482
 483         /* XXX it would be nice to mark the buffer as written to */
 484 }
 485
 486 StreamPanner*
 487 EqualPowerStereoPanner::factory (Panner& parent)
 488 {
 489         return new EqualPowerStereoPanner (parent);
 490 }
 491
 492 XMLNode&
 493 EqualPowerStereoPanner::get_state (void)
 494 {
 495         return state (true);
 496 }
 497
 498 XMLNode&
 499 EqualPowerStereoPanner::state (bool full_state)
 500 {
 501         XMLNode* root = new XMLNode ("StreamPanner");
 502         char buf[64];
 503         LocaleGuard lg (X_("POSIX"));
 504
 505         snprintf (buf, sizeof (buf), "%.12g", x);
 506         root->add_property (X_("x"), buf);
 507         root->add_property (X_("type"), EqualPowerStereoPanner::name);
 508
 509         XMLNode* autonode = new XMLNode (X_("Automation"));
 510         autonode->add_child_nocopy (_automation.state (full_state));
 511         root->add_child_nocopy (*autonode);
 512
 513         StreamPanner::add_state (*root);
 514
 515         root->add_child_nocopy (_control.get_state ());
 516
 517         return *root;
 518 }
 519
 520 int
 521 EqualPowerStereoPanner::set_state (const XMLNode& node)
 522 {
 523         const XMLProperty* prop;
 524         float pos;
 525         LocaleGuard lg (X_("POSIX"));
 526
 527         if ((prop = node.property (X_("x")))) {
 528                 pos = atof (prop->value().c_str());
 529                 set_position (pos, true);
 530         }
 531
 532         StreamPanner::set_state (node);
 533
 534         for (XMLNodeConstIterator iter = node.children().begin(); iter != node.children().end(); ++iter) {
 535
 536                 if ((*iter)->name() == X_("controllable")) {
 537                         if ((prop = (*iter)->property("name")) != 0 && prop->value() == "panner") {
 538                                 _control.set_state (**iter);
 539                         }
 540
 541                 } else if ((*iter)->name() == X_("Automation")) {
 542
 543                         _automation.set_state (*((*iter)->children().front()));
 544
 545                         if (_automation.automation_state() != Off) {
 546                                 set_position (_automation.eval (parent.session().transport_frame()));
 547                         }
 548                 }
 549         }
 550
 551         return 0;
 552 }
 553
 554 /*----------------------------------------------------------------------*/
 555
 556 Multi2dPanner::Multi2dPanner (Panner& p)
 557         : StreamPanner (p), _automation (0.0, 1.0, 0.5) // XXX useless
 558 {
 559         update ();
 560 }
 561
 562 Multi2dPanner::~Multi2dPanner ()
 563 {
 564 }
 565
 566 void
 567 Multi2dPanner::snapshot (nframes_t now)
 568 {
 569         // how?
 570 }
 571
 572 void
 573 Multi2dPanner::transport_stopped (nframes_t frame)
 574 {
 575         //what?
 576 }
 577
 578 void
 579 Multi2dPanner::set_automation_style (AutoStyle style)
 580 {
 581         //what?
 582 }
 583
 584 void
 585 Multi2dPanner::set_automation_state (AutoState state)
 586 {
 587         // what?
 588 }
 589
 590 void
 591 Multi2dPanner::update ()
 592 {
 593         static const float BIAS = FLT_MIN;
 594         uint32_t i;
 595         uint32_t nouts = parent.outputs.size();
 596         float dsq[nouts];
 597         float f, fr;
 598         vector<pan_t> pans;
 599
 600         f = 0.0f;
 601
 602         for (i = 0; i < nouts; i++) {
 603                 dsq[i] = ((x - parent.outputs[i].x) * (x - parent.outputs[i].x) + (y - parent.outputs[i].y) * (y - parent.outputs[i].y) + BIAS);
 604                 if (dsq[i] < 0.0) {
 605                         dsq[i] = 0.0;
 606                 }
 607                 f += dsq[i] * dsq[i];
 608         }
 609 #ifdef __APPLE__
 610         // terrible hack to support OSX < 10.3.9 builds
 611         fr = (float) (1.0 / sqrt((double)f));
 612 #else
 613         fr = 1.0 / sqrtf(f);
 614 #endif
 615         for (i = 0; i < nouts; ++i) {
 616                 parent.outputs[i].desired_pan = 1.0f - (dsq[i] * fr);
 617         }
 618
 619         effective_x = x;
 620 }
 621
 622 void
 623 Multi2dPanner::distribute (Sample* src, Sample** obufs, gain_t gain_coeff, nframes_t nframes)
 624 {
 625         Sample* dst;
 626         pan_t pan;
 627         vector<Panner::Output>::iterator o;
 628         uint32_t n;
 629
 630         if (_muted) {
 631                 return;
 632         }
 633
 634
 635         for (n = 0, o = parent.outputs.begin(); o != parent.outputs.end(); ++o, ++n) {
 636
 637                 dst = obufs[n];
 638
 639 #ifdef CAN_INTERP
 640                 if (fabsf ((delta = (left_interp - desired_left))) > 0.002) { // about 1 degree of arc
 641
 642                         /* interpolate over 64 frames or nframes, whichever is smaller */
 643
 644                         nframes_t limit = min ((nframes_t)64, nframes);
 645                         nframes_t n;
 646
 647                         delta = -(delta / (float) (limit));
 648
 649                         for (n = 0; n < limit; n++) {
 650                                 left_interp = left_interp + delta;
 651                                 left = left_interp + 0.9 * (left - left_interp);
 652                                 dst[n] += src[n] * left * gain_coeff;
 653                         }
 654
 655                         pan = left * gain_coeff;
 656                         Session::mix_buffers_with_gain(dst+n,src+n,nframes-n,pan);
 657
 658                 } else {
 659
 660 #else
 661                         pan = (*o).desired_pan;
 662
 663                         if ((pan *= gain_coeff) != 1.0f) {
 664
 665                                 if (pan != 0.0f) {
 666                                         Session::mix_buffers_with_gain(dst,src,nframes,pan);
 667                                 }
 668                         } else {
 669                                         Session::mix_buffers_no_gain(dst,src,nframes);
 670                         }
 671 #endif
 672 #ifdef CAN_INTERP
 673                 }
 674 #endif
 675         }
 676
 677         return;
 678 }
 679
 680 void
 681 Multi2dPanner::distribute_automated (Sample* src, Sample** obufs,
 682                                      nframes_t start, nframes_t end, nframes_t nframes,
 683                                      pan_t** buffers)
 684 {
 685         if (_muted) {
 686                 return;
 687         }
 688
 689         /* what ? */
 690
 691         return;
 692 }
 693
 694 StreamPanner*
 695 Multi2dPanner::factory (Panner& p)
 696 {
 697         return new Multi2dPanner (p);
 698 }
 699
 700 int
 701 Multi2dPanner::load (istream& in, string path, uint32_t& linecnt)
 702 {
 703         return 0;
 704 }
 705
 706 XMLNode&
 707 Multi2dPanner::get_state (void)
 708 {
 709         return state (true);
 710 }
 711
 712 XMLNode&
 713 Multi2dPanner::state (bool full_state)
 714 {
 715         XMLNode* root = new XMLNode ("StreamPanner");
 716         char buf[64];
 717         LocaleGuard lg (X_("POSIX"));
 718
 719         snprintf (buf, sizeof (buf), "%.12g", x);
 720         root->add_property (X_("x"), buf);
 721         snprintf (buf, sizeof (buf), "%.12g", y);
 722         root->add_property (X_("y"), buf);
 723         root->add_property (X_("type"), Multi2dPanner::name);
 724
 725         /* XXX no meaningful automation yet */
 726
 727         return *root;
 728 }
 729
 730 int
 731 Multi2dPanner::set_state (const XMLNode& node)
 732 {
 733         const XMLProperty* prop;
 734         float newx,newy;
 735         LocaleGuard lg (X_("POSIX"));
 736
 737         newx = -1;
 738         newy = -1;
 739
 740         if ((prop = node.property (X_("x")))) {
 741                 newx = atof (prop->value().c_str());
 742         }
 743
 744         if ((prop = node.property (X_("y")))) {
 745                 newy = atof (prop->value().c_str());
 746         }
 747
 748         if (x < 0 || y < 0) {
 749                 error << _("badly-formed positional data for Multi2dPanner - ignored")
 750                       << endmsg;
 751                 return -1;
 752         }
 753
 754         set_position (newx, newy);
 755         return 0;
 756 }
 757
 758 /*---------------------------------------------------------------------- */
 759
 760 Panner::Panner (string name, Session& s)
 761         : _session (s)
 762 {
 763         set_name (name);
 764
 765         _linked = false;
 766         _link_direction = SameDirection;
 767         _bypassed = false;
 768 }
 769
 770 Panner::~Panner ()
 771 {
 772 }
 773
 774 void
 775 Panner::set_linked (bool yn)
 776 {
 777         if (yn != _linked) {
 778                 _linked = yn;
 779                 _session.set_dirty ();
 780                 LinkStateChanged (); /* EMIT SIGNAL */
 781         }
 782 }
 783
 784 void
 785 Panner::set_link_direction (LinkDirection ld)
 786 {
 787         if (ld != _link_direction) {
 788                 _link_direction = ld;
 789                 _session.set_dirty ();
 790                 LinkStateChanged (); /* EMIT SIGNAL */
 791         }
 792 }
 793
 794 void
 795 Panner::set_bypassed (bool yn)
 796 {
 797         if (yn != _bypassed) {
 798                 _bypassed = yn;
 799                 StateChanged ();
 800         }
 801 }
 802
 803
 804 void
 805 Panner::reset (uint32_t nouts, uint32_t npans)
 806 {
 807         uint32_t n;
 808         bool changed = false;
 809         bool do_not_and_did_not_need_panning = ((nouts < 2) && (outputs.size() < 2));
 810
 811         /* if new and old config don't need panning, or if
 812            the config hasn't changed, we're done.
 813         */
 814
 815         if (do_not_and_did_not_need_panning ||
 816             ((nouts == outputs.size()) && (npans == size()))) {
 817                 return;
 818         }
 819
 820         n = size();
 821         clear ();
 822
 823         if (n != npans) {
 824                 changed = true;
 825         }
 826
 827         n = outputs.size();
 828         outputs.clear ();
 829
 830         if (n != nouts) {
 831                 changed = true;
 832         }
 833
 834         if (nouts < 2) {
 835                 goto send_changed;
 836         }
 837
 838         switch (nouts) {
 839         case 0:
 840                 break;
 841
 842         case 1:
 843                 fatal << _("programming error:")
 844                       << X_("Panner::reset() called with a single output")
 845                       << endmsg;
 846                 /*NOTREACHED*/
 847                 break;
 848
 849         case 2:
 850                 /* line */
 851                 outputs.push_back (Output (0, 0));
 852                 outputs.push_back (Output (1.0, 0));
 853
 854                 for (n = 0; n < npans; ++n) {
 855                         push_back (new EqualPowerStereoPanner (*this));
 856                 }
 857                 break;
 858
 859         case 3: // triangle
 860                 outputs.push_back (Output  (0.5, 0));
 861                 outputs.push_back (Output  (0, 1.0));
 862                 outputs.push_back (Output  (1.0, 1.0));
 863
 864                 for (n = 0; n < npans; ++n) {
 865                         push_back (new Multi2dPanner (*this));
 866                 }
 867
 868                 break;
 869
 870         case 4: // square
 871                 outputs.push_back (Output  (0, 0));
 872                 outputs.push_back (Output  (1.0, 0));
 873                 outputs.push_back (Output  (1.0, 1.0));
 874                 outputs.push_back (Output  (0, 1.0));
 875
 876                 for (n = 0; n < npans; ++n) {
 877                         push_back (new Multi2dPanner (*this));
 878                 }
 879
 880                 break;
 881
 882         case 5: //square+offcenter center
 883                 outputs.push_back (Output  (0, 0));
 884                 outputs.push_back (Output  (1.0, 0));
 885                 outputs.push_back (Output  (1.0, 1.0));
 886                 outputs.push_back (Output  (0, 1.0));
 887                 outputs.push_back (Output  (0.5, 0.75));
 888
 889                 for (n = 0; n < npans; ++n) {
 890                         push_back (new Multi2dPanner (*this));
 891                 }
 892
 893                 break;
 894
 895         default:
 896                 /* XXX horrible placement. FIXME */
 897                 for (n = 0; n < nouts; ++n) {
 898                         outputs.push_back (Output (0.1 * n, 0.1 * n));
 899                 }
 900
 901                 for (n = 0; n < npans; ++n) {
 902                         push_back (new Multi2dPanner (*this));
 903                 }
 904
 905                 break;
 906         }
 907
 908         for (iterator x = begin(); x != end(); ++x) {
 909                 (*x)->update ();
 910         }
 911
 912         /* force hard left/right panning in a common case: 2in/2out
 913         */
 914
 915         if (npans == 2 && outputs.size() == 2) {
 916
 917                 /* Do this only if we changed configuration, or our configuration
 918                    appears to be the default set up (center).
 919                 */
 920
 921                 float left;
 922                 float right;
 923
 924                 front()->get_position (left);
 925                 back()->get_position (right);
 926
 927                 if (changed || ((left == 0.5) && (right == 0.5))) {
 928
 929                         front()->set_position (0.0);
 930                         front()->automation().reset_default (0.0);
 931
 932                         back()->set_position (1.0);
 933                         back()->automation().reset_default (1.0);
 934
 935                         changed = true;
 936                 }
 937         }
 938
 939   send_changed:
 940         if (changed) {
 941                 Changed (); /* EMIT SIGNAL */
 942         }
 943
 944         return;
 945 }
 946
 947 void
 948 Panner::remove (uint32_t which)
 949 {
 950         vector<StreamPanner*>::iterator i;
 951         for (i = begin(); i != end() && which; ++i, --which);
 952
 953         if (i != end()) {
 954                 delete *i;
 955                 erase (i);
 956         }
 957 }
 958
 959 void
 960 Panner::clear ()
 961 {
 962         for (vector<StreamPanner*>::iterator i = begin(); i != end(); ++i) {
 963                 delete *i;
 964         }
 965
 966         vector<StreamPanner*>::clear ();
 967 }
 968
 969 void
 970 Panner::set_automation_style (AutoStyle style)
 971 {
 972         for (vector<StreamPanner*>::iterator i = begin(); i != end(); ++i) {
 973                 (*i)->set_automation_style (style);
 974         }
 975         _session.set_dirty ();
 976 }
 977
 978 void
 979 Panner::set_automation_state (AutoState state)
 980 {
 981         for (vector<StreamPanner*>::iterator i = begin(); i != end(); ++i) {
 982                 (*i)->set_automation_state (state);
 983         }
 984         _session.set_dirty ();
 985 }
 986
 987 AutoState
 988 Panner::automation_state () const
 989 {
 990         if (!empty()) {
 991                 return front()->automation().automation_state ();
 992         } else {
 993                 return Off;
 994         }
 995 }
 996
 997 AutoStyle
 998 Panner::automation_style () const
 999 {
1000         if (!empty()) {
1001                 return front()->automation().automation_style ();
1002         } else {
1003                 return Absolute;
1004         }
1005 }
1006
1007 void
1008 Panner::transport_stopped (nframes_t frame)
1009 {
1010         for (vector<StreamPanner*>::iterator i = begin(); i != end(); ++i) {
1011                 (*i)->transport_stopped (frame);
1012         }
1013 }
1014
1015 void
1016 Panner::snapshot (nframes_t now)
1017 {
1018         for (vector<StreamPanner*>::iterator i = begin(); i != end(); ++i) {
1019                 (*i)->snapshot (now);
1020         }
1021 }
1022
1023 void
1024 Panner::clear_automation ()
1025 {
1026         for (vector<StreamPanner*>::iterator i = begin(); i != end(); ++i) {
1027                 (*i)->automation().clear ();
1028         }
1029         _session.set_dirty ();
1030 }
1031
1032 struct PanPlugins {
1033     string name;
1034     uint32_t nouts;
1035     StreamPanner* (*factory)(Panner&);
1036 };
1037
1038 PanPlugins pan_plugins[] = {
1039         { EqualPowerStereoPanner::name, 2, EqualPowerStereoPanner::factory },
1040         { Multi2dPanner::name, 3, Multi2dPanner::factory },
1041         { string (""), 0, 0 }
1042 };
1043
1044 XMLNode&
1045 Panner::get_state (void)
1046 {
1047         return state (true);
1048 }
1049
1050 XMLNode&
1051 Panner::state (bool full)
1052 {
1053         XMLNode* root = new XMLNode (X_("Panner"));
1054         char buf[32];
1055
1056         root->add_property (X_("linked"), (_linked ? "yes" : "no"));
1057         root->add_property (X_("link_direction"), enum_2_string (_link_direction));
1058         root->add_property (X_("bypassed"), (bypassed() ? "yes" : "no"));
1059
1060         /* add each output */
1061
1062         for (vector<Panner::Output>::iterator o = outputs.begin(); o != outputs.end(); ++o) {
1063                 XMLNode* onode = new XMLNode (X_("Output"));
1064                 snprintf (buf, sizeof (buf), "%.12g", (*o).x);
1065                 onode->add_property (X_("x"), buf);
1066                 snprintf (buf, sizeof (buf), "%.12g", (*o).y);
1067                 onode->add_property (X_("y"), buf);
1068                 root->add_child_nocopy (*onode);
1069         }
1070
1071         for (vector<StreamPanner*>::const_iterator i = begin(); i != end(); ++i) {
1072                 root->add_child_nocopy ((*i)->state (full));
1073         }
1074
1075         return *root;
1076 }
1077
1078 int
1079 Panner::set_state (const XMLNode& node)
1080 {
1081         XMLNodeList nlist;
1082         XMLNodeConstIterator niter;
1083         const XMLProperty *prop;
1084         uint32_t i;
1085         StreamPanner* sp;
1086         LocaleGuard lg (X_("POSIX"));
1087
1088         clear ();
1089         outputs.clear ();
1090
1091         if ((prop = node.property (X_("linked"))) != 0) {
1092                 set_linked (prop->value() == "yes");
1093         }
1094
1095
1096         if ((prop = node.property (X_("bypassed"))) != 0) {
1097                 set_bypassed (prop->value() == "yes");
1098         }
1099
1100         if ((prop = node.property (X_("link_direction"))) != 0) {
1101                 LinkDirection ld; /* here to provide type information */
1102                 set_link_direction (LinkDirection (string_2_enum (prop->value(), ld)));
1103         }
1104
1105         nlist = node.children();
1106
1107         for (niter = nlist.begin(); niter != nlist.end(); ++niter) {
1108                 if ((*niter)->name() == X_("Output")) {
1109
1110                         float x, y;
1111
1112                         prop = (*niter)->property (X_("x"));
1113                         sscanf (prop->value().c_str(), "%g", &x);
1114
1115                         prop = (*niter)->property (X_("y"));
1116                         sscanf (prop->value().c_str(), "%g", &y);
1117
1118                         outputs.push_back (Output (x, y));
1119                 }
1120         }
1121
1122         for (niter = nlist.begin(); niter != nlist.end(); ++niter) {
1123
1124                 if ((*niter)->name() == X_("StreamPanner")) {
1125
1126                         if ((prop = (*niter)->property (X_("type")))) {
1127
1128                                 for (i = 0; pan_plugins[i].factory; ++i) {
1129                                         if (prop->value() == pan_plugins[i].name) {
1130
1131
1132                                                 /* note that we assume that all the stream panners
1133                                                    are of the same type. pretty good
1134                                                    assumption, but its still an assumption.
1135                                                 */
1136
1137                                                 sp = pan_plugins[i].factory (*this);
1138
1139                                                 if (sp->set_state (**niter) == 0) {
1140                                                         push_back (sp);
1141                                                 }
1142
1143                                                 break;
1144                                         }
1145                                 }
1146
1147
1148                                 if (!pan_plugins[i].factory) {
1149                                         error << string_compose (_("Unknown panner plugin \"%1\" found in pan state - ignored"),
1150                                                           prop->value())
1151                                               << endmsg;
1152                                 }
1153
1154                         } else {
1155                                 error << _("panner plugin node has no type information!")
1156                                       << endmsg;
1157                                 return -1;
1158                         }
1159
1160                 }
1161         }
1162
1163         /* don't try to do old-school automation loading if it wasn't marked as existing */
1164
1165         if ((prop = node.property (X_("automation")))) {
1166
1167                 /* automation path is relative */
1168
1169                 automation_path = Glib::build_filename(_session.automation_dir(), prop->value ());
1170         }
1171
1172         return 0;
1173 }
1174
1175
1176
1177 bool
1178 Panner::touching () const
1179 {
1180         for (vector<StreamPanner*>::const_iterator i = begin(); i != end(); ++i) {
1181                 if ((*i)->automation().touching ()) {
1182                         return true;
1183                 }
1184         }
1185
1186         return false;
1187 }
1188
1189 void
1190 Panner::set_position (float xpos, StreamPanner& orig)
1191 {
1192         float xnow;
1193         float xdelta ;
1194         float xnew;
1195
1196         orig.get_position (xnow);
1197         xdelta = xpos - xnow;
1198
1199         if (_link_direction == SameDirection) {
1200
1201                 for (vector<StreamPanner*>::iterator i = begin(); i != end(); ++i) {
1202                         if (*i == &orig) {
1203                                 (*i)->set_position (xpos, true);
1204                         } else {
1205                                 (*i)->get_position (xnow);
1206                                 xnew = min (1.0f, xnow + xdelta);
1207                                 xnew = max (0.0f, xnew);
1208                                 (*i)->set_position (xnew, true);
1209                         }
1210                 }
1211
1212         } else {
1213
1214                 for (vector<StreamPanner*>::iterator i = begin(); i != end(); ++i) {
1215                         if (*i == &orig) {
1216                                 (*i)->set_position (xpos, true);
1217                         } else {
1218                                 (*i)->get_position (xnow);
1219                                 xnew = min (1.0f, xnow - xdelta);
1220                                 xnew = max (0.0f, xnew);
1221                                 (*i)->set_position (xnew, true);
1222                         }
1223                 }
1224         }
1225 }
1226
1227 void
1228 Panner::set_position (float xpos, float ypos, StreamPanner& orig)
1229 {
1230         float xnow, ynow;
1231         float xdelta, ydelta;
1232         float xnew, ynew;
1233
1234         orig.get_position (xnow, ynow);
1235         xdelta = xpos - xnow;
1236         ydelta = ypos - ynow;
1237
1238         if (_link_direction == SameDirection) {
1239
1240                 for (vector<StreamPanner*>::iterator i = begin(); i != end(); ++i) {
1241                         if (*i == &orig) {
1242                                 (*i)->set_position (xpos, ypos, true);
1243                         } else {
1244                                 (*i)->get_position (xnow, ynow);
1245
1246                                 xnew = min (1.0f, xnow + xdelta);
1247                                 xnew = max (0.0f, xnew);
1248
1249                                 ynew = min (1.0f, ynow + ydelta);
1250                                 ynew = max (0.0f, ynew);
1251
1252                                 (*i)->set_position (xnew, ynew, true);
1253                         }
1254                 }
1255
1256         } else {
1257
1258                 for (vector<StreamPanner*>::iterator i = begin(); i != end(); ++i) {
1259                         if (*i == &orig) {
1260                                 (*i)->set_position (xpos, ypos, true);
1261                         } else {
1262                                 (*i)->get_position (xnow, ynow);
1263
1264                                 xnew = min (1.0f, xnow - xdelta);
1265                                 xnew = max (0.0f, xnew);
1266
1267                                 ynew = min (1.0f, ynow - ydelta);
1268                                 ynew = max (0.0f, ynew);
1269
1270                                 (*i)->set_position (xnew, ynew, true);
1271                         }
1272                 }
1273         }
1274 }
1275
1276 void
1277 Panner::set_position (float xpos, float ypos, float zpos, StreamPanner& orig)
1278 {
1279         float xnow, ynow, znow;
1280         float xdelta, ydelta, zdelta;
1281         float xnew, ynew, znew;
1282
1283         orig.get_position (xnow, ynow, znow);
1284         xdelta = xpos - xnow;
1285         ydelta = ypos - ynow;
1286         zdelta = zpos - znow;
1287
1288         if (_link_direction == SameDirection) {
1289
1290                 for (vector<StreamPanner*>::iterator i = begin(); i != end(); ++i) {
1291                         if (*i == &orig) {
1292                                 (*i)->set_position (xpos, ypos, zpos, true);
1293                         } else {
1294                                 (*i)->get_position (xnow, ynow, znow);
1295
1296                                 xnew = min (1.0f, xnow + xdelta);
1297                                 xnew = max (0.0f, xnew);
1298
1299                                 ynew = min (1.0f, ynow + ydelta);
1300                                 ynew = max (0.0f, ynew);
1301
1302                                 znew = min (1.0f, znow + zdelta);
1303                                 znew = max (0.0f, znew);
1304
1305                                 (*i)->set_position (xnew, ynew, znew, true);
1306                         }
1307                 }
1308
1309         } else {
1310
1311                 for (vector<StreamPanner*>::iterator i = begin(); i != end(); ++i) {
1312                         if (*i == &orig) {
1313                                 (*i)->set_position (xpos, ypos, true);
1314                         } else {
1315                                 (*i)->get_position (xnow, ynow, znow);
1316
1317                                 xnew = min (1.0f, xnow - xdelta);
1318                                 xnew = max (0.0f, xnew);
1319
1320                                 ynew = min (1.0f, ynow - ydelta);
1321                                 ynew = max (0.0f, ynew);
1322
1323                                 znew = min (1.0f, znow + zdelta);
1324                                 znew = max (0.0f, znew);
1325
1326                                 (*i)->set_position (xnew, ynew, znew, true);
1327                         }
1328                 }
1329         }
1330 }
1331
1332 /* old school automation handling */
1333
1334 void
1335 Panner::set_name (string str)
1336 {
1337         automation_path = Glib::build_filename(_session.automation_dir(),
1338                 _session.snap_name() + "-pan-" + legalize_for_path (str) + ".automation");
1339 }
1340
1341 int
1342 Panner::load ()
1343 {
1344         char line[128];
1345         uint32_t linecnt = 0;
1346         float version;
1347         iterator sp;
1348         LocaleGuard lg (X_("POSIX"));
1349
1350         if (automation_path.length() == 0) {
1351                 return 0;
1352         }
1353
1354         if (access (automation_path.c_str(), F_OK)) {
1355                 return 0;
1356         }
1357
1358         ifstream in (automation_path.c_str());
1359
1360         if (!in) {
1361                 error << string_compose (_("cannot open pan automation file %1 (%2)"),
1362                                   automation_path, strerror (errno))
1363                       << endmsg;
1364                 return -1;
1365         }
1366
1367         sp = begin();
1368
1369         while (in.getline (line, sizeof(line), '\n')) {
1370
1371                 if (++linecnt == 1) {
1372                         if (memcmp (line, X_("version"), 7) == 0) {
1373                                 if (sscanf (line, "version %f", &version) != 1) {
1374                                         error << string_compose(_("badly formed version number in pan automation event file \"%1\""), automation_path) << endmsg;
1375                                         return -1;
1376                                 }
1377                         } else {
1378                                 error << string_compose(_("no version information in pan automation event file \"%1\" (first line = %2)"),
1379                                                  automation_path, line) << endmsg;
1380                                 return -1;
1381                         }
1382
1383                         continue;
1384                 }
1385
1386                 if (strlen (line) == 0 || line[0] == '#') {
1387                         continue;
1388                 }
1389
1390                 if (strcmp (line, "begin") == 0) {
1391
1392                         if (sp == end()) {
1393                                 error << string_compose (_("too many panner states found in pan automation file %1"),
1394                                                   automation_path)
1395                                       << endmsg;
1396                                 return -1;
1397                         }
1398
1399                         if ((*sp)->load (in, automation_path, linecnt)) {
1400                                 return -1;
1401                         }
1402
1403                         ++sp;
1404                 }
1405         }
1406
1407         return 0;
1408 }