gtk2_ardour/engine_dialog.cc

   1 /*
   2     Copyright (C) 2010 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 <exception>
  21 #include <vector>
  22 #include <cmath>
  23 #include <fstream>
  24 #include <map>
  25
  26 #include <boost/scoped_ptr.hpp>
  27
  28 #include <gtkmm/messagedialog.h>
  29
  30 #include "pbd/error.h"
  31 #include "pbd/xml++.h"
  32 #include "pbd/unwind.h"
  33 #include "pbd/failed_constructor.h"
  34
  35 #include <gtkmm/alignment.h>
  36 #include <gtkmm/stock.h>
  37 #include <gtkmm/notebook.h>
  38 #include <gtkmm2ext/utils.h>
  39
  40 #include "ardour/audio_backend.h"
  41 #include "ardour/audioengine.h"
  42 #include "ardour/mtdm.h"
  43 #include "ardour/mididm.h"
  44 #include "ardour/rc_configuration.h"
  45 #include "ardour/types.h"
  46 #include "ardour/profile.h"
  47
  48 #include "pbd/convert.h"
  49 #include "pbd/error.h"
  50
  51 #include "opts.h"
  52 #include "debug.h"
  53 #include "ardour_ui.h"
  54 #include "engine_dialog.h"
  55 #include "gui_thread.h"
  56 #include "utils.h"
  57 #include "i18n.h"
  58
  59 using namespace std;
  60 using namespace Gtk;
  61 using namespace Gtkmm2ext;
  62 using namespace PBD;
  63 using namespace Glib;
  64 using namespace ARDOUR_UI_UTILS;
  65
  66 #define DEBUG_ECONTROL(msg) DEBUG_TRACE (PBD::DEBUG::EngineControl, string_compose ("%1: %2\n", __LINE__, msg));
  67
  68 static const unsigned int midi_tab = 2;
  69 static const unsigned int latency_tab = 1; /* zero-based, page zero is the main setup page */
  70
  71 static const char* results_markup = X_("<span weight=\"bold\" size=\"larger\">%1</span>");
  72
  73 EngineControl::EngineControl ()
  74         : ArdourDialog (_("Audio/MIDI Setup"))
  75         , engine_status ("")
  76         , basic_packer (9, 4)
  77         , input_latency_adjustment (0, 0, 99999, 1)
  78         , input_latency (input_latency_adjustment)
  79         , output_latency_adjustment (0, 0, 99999, 1)
  80         , output_latency (output_latency_adjustment)
  81         , input_channels_adjustment (0, 0, 256, 1)
  82         , input_channels (input_channels_adjustment)
  83         , output_channels_adjustment (0, 0, 256, 1)
  84         , output_channels (output_channels_adjustment)
  85         , ports_adjustment (128, 8, 1024, 1, 16)
  86         , ports_spinner (ports_adjustment)
  87         , control_app_button (_("Device Control Panel"))
  88         , midi_devices_button (_("Midi Device Setup"))
  89         , lm_measure_label (_("Measure"))
  90         , lm_use_button (_("Use results"))
  91         , lm_back_button (_("Back to settings ... (ignore results)"))
  92         , lm_button_audio (_("Calibrate Audio"))
  93         , lm_table (12, 3)
  94         , have_lm_results (false)
  95         , lm_running (false)
  96         , midi_back_button (_("Back to settings"))
  97         , ignore_changes (0)
  98         , _desired_sample_rate (0)
  99         , started_at_least_once (false)
 100         , queue_device_changed (false)
 101         , block_signals(0)
 102 {
 103         using namespace Notebook_Helpers;
 104         vector<string> backend_names;
 105         Label* label;
 106         AttachOptions xopt = AttachOptions (FILL|EXPAND);
 107         int row;
 108
 109         set_name (X_("AudioMIDISetup"));
 110
 111         /* the backend combo is the one thing that is ALWAYS visible */
 112
 113         vector<const ARDOUR::AudioBackendInfo*> backends = ARDOUR::AudioEngine::instance()->available_backends();
 114
 115         if (backends.empty()) {
 116                 MessageDialog msg (string_compose (_("No audio/MIDI backends detected. %1 cannot run\n\n(This is a build/packaging/system error. It should never happen.)"), PROGRAM_NAME));
 117                 msg.run ();
 118                 throw failed_constructor ();
 119         }
 120
 121         for (vector<const ARDOUR::AudioBackendInfo*>::const_iterator b = backends.begin(); b != backends.end(); ++b) {
 122                 backend_names.push_back ((*b)->name);
 123         }
 124
 125         set_popdown_strings (backend_combo, backend_names);
 126
 127         /* setup basic packing characteristics for the table used on the main
 128          * tab of the notebook
 129          */
 130
 131         basic_packer.set_spacings (6);
 132         basic_packer.set_border_width (12);
 133         basic_packer.set_homogeneous (false);
 134
 135         /* pack it in */
 136
 137         basic_hbox.pack_start (basic_packer, false, false);
 138
 139         /* latency measurement tab */
 140
 141         lm_title.set_markup (string_compose ("<span size=\"large\" weight=\"bold\">%1</span>", _("Latency Measurement Tool")));
 142
 143         row = 0;
 144         lm_table.set_row_spacings (12);
 145         lm_table.set_col_spacings (6);
 146         lm_table.set_homogeneous (false);
 147
 148         lm_table.attach (lm_title, 0, 3, row, row+1, xopt, (AttachOptions) 0);
 149         row++;
 150
 151         lm_preamble.set_width_chars (60);
 152         lm_preamble.set_line_wrap (true);
 153         lm_preamble.set_markup (_("<span weight=\"bold\">Turn down the volume on your audio equipment to a very low level.</span>"));
 154
 155         lm_table.attach (lm_preamble, 0, 3, row, row+1, AttachOptions(FILL|EXPAND), (AttachOptions) 0);
 156         row++;
 157
 158         Gtk::Label* preamble;
 159         preamble = manage (new Label);
 160         preamble->set_width_chars (60);
 161         preamble->set_line_wrap (true);
 162         preamble->set_markup (_("Select two channels below and connect them using a cable."));
 163
 164         lm_table.attach (*preamble, 0, 3, row, row+1, AttachOptions(FILL|EXPAND), (AttachOptions) 0);
 165         row++;
 166
 167         label = manage (new Label (_("Output channel")));
 168         lm_table.attach (*label, 0, 1, row, row+1, xopt, (AttachOptions) 0);
 169
 170         Gtk::Alignment* misc_align = manage (new Alignment (0.0, 0.5));
 171         misc_align->add (lm_output_channel_combo);
 172         lm_table.attach (*misc_align, 1, 3, row, row+1, xopt, (AttachOptions) 0);
 173         ++row;
 174
 175         label = manage (new Label (_("Input channel")));
 176         lm_table.attach (*label, 0, 1, row, row+1, xopt, (AttachOptions) 0);
 177
 178         misc_align = manage (new Alignment (0.0, 0.5));
 179         misc_align->add (lm_input_channel_combo);
 180         lm_table.attach (*misc_align, 1, 3, row, row+1, FILL, (AttachOptions) 0);
 181         ++row;
 182
 183         lm_measure_label.set_padding (10, 10);
 184         lm_measure_button.add (lm_measure_label);
 185         lm_measure_button.signal_clicked().connect (sigc::mem_fun (*this, &EngineControl::latency_button_clicked));
 186         lm_use_button.signal_clicked().connect (sigc::mem_fun (*this, &EngineControl::use_latency_button_clicked));
 187         lm_back_button_signal = lm_back_button.signal_clicked().connect (sigc::bind (sigc::mem_fun (notebook, &Gtk::Notebook::set_current_page), 0));
 188
 189         lm_use_button.set_sensitive (false);
 190
 191         /* Increase the default spacing around the labels of these three
 192          * buttons
 193          */
 194
 195         Gtk::Misc* l;
 196
 197         if ((l = dynamic_cast<Gtk::Misc*>(lm_use_button.get_child())) != 0) {
 198                 l->set_padding (10, 10);
 199         }
 200
 201         if ((l = dynamic_cast<Gtk::Misc*>(lm_back_button.get_child())) != 0) {
 202                 l->set_padding (10, 10);
 203         }
 204
 205         preamble = manage (new Label);
 206         preamble->set_width_chars (60);
 207         preamble->set_line_wrap (true);
 208         preamble->set_markup (_("Once the channels are connected, click the \"Measure\" button."));
 209         lm_table.attach (*preamble, 0, 3, row, row+1, AttachOptions(FILL|EXPAND), (AttachOptions) 0);
 210         row++;
 211
 212         preamble = manage (new Label);
 213         preamble->set_width_chars (60);
 214         preamble->set_line_wrap (true);
 215         preamble->set_markup (_("When satisfied with the results, click the \"Use results\" button."));
 216         lm_table.attach (*preamble, 0, 3, row, row+1, AttachOptions(FILL|EXPAND), (AttachOptions) 0);
 217
 218         ++row; // skip a row in the table
 219         ++row; // skip a row in the table
 220
 221         lm_table.attach (lm_results, 0, 3, row, row+1, AttachOptions(FILL|EXPAND), (AttachOptions) 0);
 222
 223         ++row; // skip a row in the table
 224         ++row; // skip a row in the table
 225
 226         lm_table.attach (lm_measure_button, 0, 1, row, row+1, AttachOptions(FILL|EXPAND), (AttachOptions) 0);
 227         lm_table.attach (lm_use_button, 1, 2, row, row+1, AttachOptions(FILL|EXPAND), (AttachOptions) 0);
 228         lm_table.attach (lm_back_button, 2, 3, row, row+1, AttachOptions(FILL|EXPAND), (AttachOptions) 0);
 229
 230         lm_results.set_markup (string_compose (results_markup, _("No measurement results yet")));
 231
 232         lm_vbox.set_border_width (12);
 233         lm_vbox.pack_start (lm_table, false, false);
 234
 235         midi_back_button.signal_clicked().connect (sigc::bind (sigc::mem_fun (notebook, &Gtk::Notebook::set_current_page), 0));
 236
 237         /* pack it all up */
 238
 239         notebook.pages().push_back (TabElem (basic_vbox, _("Audio")));
 240         notebook.pages().push_back (TabElem (lm_vbox, _("Latency")));
 241         notebook.pages().push_back (TabElem (midi_vbox, _("MIDI")));
 242         notebook.set_border_width (12);
 243
 244         notebook.set_show_tabs (false);
 245         notebook.show_all ();
 246
 247         notebook.set_name ("SettingsNotebook");
 248
 249         /* packup the notebook */
 250
 251         get_vbox()->set_border_width (12);
 252         get_vbox()->pack_start (notebook);
 253
 254         get_action_area()->pack_start (engine_status);
 255         engine_status.show();
 256
 257         /* need a special function to print "all available channels" when the
 258          * channel counts hit zero.
 259          */
 260
 261         input_channels.signal_output().connect (sigc::bind (sigc::ptr_fun (&EngineControl::print_channel_count), &input_channels));
 262         output_channels.signal_output().connect (sigc::bind (sigc::ptr_fun (&EngineControl::print_channel_count), &output_channels));
 263
 264         midi_devices_button.signal_clicked.connect (mem_fun (*this, &EngineControl::configure_midi_devices));
 265         midi_devices_button.set_sensitive (false);
 266         midi_devices_button.set_name ("generic button");
 267         midi_devices_button.set_can_focus(true);
 268
 269         control_app_button.signal_clicked().connect (mem_fun (*this, &EngineControl::control_app_button_clicked));
 270         manage_control_app_sensitivity ();
 271
 272         cancel_button = add_button (Gtk::Stock::CLOSE, Gtk::RESPONSE_CANCEL);
 273         apply_button = add_button (Gtk::Stock::APPLY, Gtk::RESPONSE_APPLY);
 274         ok_button = add_button (Gtk::Stock::OK, Gtk::RESPONSE_OK);
 275
 276         /* Pick up any existing audio setup configuration, if appropriate */
 277
 278         XMLNode* audio_setup = ARDOUR::Config->extra_xml ("AudioMIDISetup");
 279
 280         ARDOUR::AudioEngine::instance()->Running.connect (running_connection, MISSING_INVALIDATOR, boost::bind (&EngineControl::engine_running, this), gui_context());
 281         ARDOUR::AudioEngine::instance()->Stopped.connect (stopped_connection, MISSING_INVALIDATOR, boost::bind (&EngineControl::engine_stopped, this), gui_context());
 282         ARDOUR::AudioEngine::instance()->Halted.connect (stopped_connection, MISSING_INVALIDATOR, boost::bind (&EngineControl::engine_stopped, this), gui_context());
 283         ARDOUR::AudioEngine::instance()->DeviceListChanged.connect (devicelist_connection, MISSING_INVALIDATOR, boost::bind (&EngineControl::device_list_changed, this), gui_context());
 284
 285         if (audio_setup) {
 286                 if (!set_state (*audio_setup)) {
 287                         set_default_state ();
 288                 }
 289         } else {
 290                 set_default_state ();
 291         }
 292
 293         connect_changed_signals ();
 294
 295         notebook.signal_switch_page().connect (sigc::mem_fun (*this, &EngineControl::on_switch_page));
 296
 297         connect_disconnect_button.signal_clicked().connect (sigc::mem_fun (*this, &EngineControl::connect_disconnect_click));
 298         connect_disconnect_button.set_no_show_all();
 299
 300 }
 301
 302 void
 303 EngineControl::connect_changed_signals ()
 304 {
 305         backend_combo_connection = backend_combo.signal_changed ().connect (
 306             sigc::mem_fun (*this, &EngineControl::backend_changed));
 307         driver_combo_connection = driver_combo.signal_changed ().connect (
 308             sigc::mem_fun (*this, &EngineControl::driver_changed));
 309         sample_rate_combo_connection = sample_rate_combo.signal_changed ().connect (
 310             sigc::mem_fun (*this, &EngineControl::sample_rate_changed));
 311         buffer_size_combo_connection = buffer_size_combo.signal_changed ().connect (
 312             sigc::mem_fun (*this, &EngineControl::buffer_size_changed));
 313         device_combo_connection = device_combo.signal_changed ().connect (
 314             sigc::mem_fun (*this, &EngineControl::device_changed));
 315         midi_option_combo_connection = midi_option_combo.signal_changed ().connect (
 316             sigc::mem_fun (*this, &EngineControl::midi_option_changed));
 317
 318         input_device_combo_connection = input_device_combo.signal_changed ().connect (
 319             sigc::mem_fun (*this, &EngineControl::input_device_changed));
 320         output_device_combo_connection = output_device_combo.signal_changed ().connect (
 321             sigc::mem_fun (*this, &EngineControl::output_device_changed));
 322
 323         input_latency_connection = input_latency.signal_changed ().connect (
 324             sigc::mem_fun (*this, &EngineControl::parameter_changed));
 325         output_latency_connection = output_latency.signal_changed ().connect (
 326             sigc::mem_fun (*this, &EngineControl::parameter_changed));
 327         input_channels_connection = input_channels.signal_changed ().connect (
 328             sigc::mem_fun (*this, &EngineControl::parameter_changed));
 329         output_channels_connection = output_channels.signal_changed ().connect (
 330             sigc::mem_fun (*this, &EngineControl::parameter_changed));
 331 }
 332
 333 void
 334 EngineControl::block_changed_signals ()
 335 {
 336         if (block_signals++ == 0) {
 337                 DEBUG_ECONTROL ("Blocking changed signals");
 338                 backend_combo_connection.block ();
 339                 driver_combo_connection.block ();
 340                 sample_rate_combo_connection.block ();
 341                 buffer_size_combo_connection.block ();
 342                 device_combo_connection.block ();
 343                 input_device_combo_connection.block ();
 344                 output_device_combo_connection.block ();
 345                 midi_option_combo_connection.block ();
 346                 input_latency_connection.block ();
 347                 output_latency_connection.block ();
 348                 input_channels_connection.block ();
 349                 output_channels_connection.block ();
 350         }
 351 }
 352
 353 void
 354 EngineControl::unblock_changed_signals ()
 355 {
 356         if (--block_signals == 0) {
 357                 DEBUG_ECONTROL ("Unblocking changed signals");
 358                 backend_combo_connection.unblock ();
 359                 driver_combo_connection.unblock ();
 360                 sample_rate_combo_connection.unblock ();
 361                 buffer_size_combo_connection.unblock ();
 362                 device_combo_connection.unblock ();
 363                 input_device_combo_connection.unblock ();
 364                 output_device_combo_connection.unblock ();
 365                 midi_option_combo_connection.unblock ();
 366                 input_latency_connection.unblock ();
 367                 output_latency_connection.unblock ();
 368                 input_channels_connection.unblock ();
 369                 output_channels_connection.unblock ();
 370         }
 371 }
 372
 373 EngineControl::SignalBlocker::SignalBlocker (EngineControl& engine_control,
 374                                              const std::string& reason)
 375     : ec (engine_control)
 376     , m_reason (reason)
 377 {
 378         DEBUG_ECONTROL (string_compose ("SignalBlocker: %1", m_reason));
 379         ec.block_changed_signals ();
 380 }
 381
 382 EngineControl::SignalBlocker::~SignalBlocker ()
 383 {
 384         DEBUG_ECONTROL (string_compose ("~SignalBlocker: %1", m_reason));
 385         ec.unblock_changed_signals ();
 386 }
 387
 388 void
 389 EngineControl::on_show ()
 390 {
 391         ArdourDialog::on_show ();
 392         if (!ARDOUR::AudioEngine::instance()->current_backend() || !ARDOUR::AudioEngine::instance()->running()) {
 393                 // re-check _have_control (jackd running) see #6041
 394                 backend_changed ();
 395         }
 396         device_changed ();
 397         ok_button->grab_focus();
 398 }
 399
 400 void
 401 EngineControl::on_response (int response_id)
 402 {
 403         ArdourDialog::on_response (response_id);
 404
 405         switch (response_id) {
 406                 case RESPONSE_APPLY:
 407                         push_state_to_backend (true);
 408                         break;
 409                 case RESPONSE_OK:
 410 #ifdef PLATFORM_WINDOWS
 411                         // For some reason we don't understand, 'hide()'
 412                         // needs to get called first in Windows
 413                         hide ();
 414
 415                         // But if there's no session open, this can produce
 416                         // a long gap when nothing appears to be happening.
 417                         // Let's show the splash image while we're waiting.
 418                         if ( !ARDOUR_COMMAND_LINE::no_splash ) {
 419                                 if ( ARDOUR_UI::instance() ) {
 420                                         if ( !ARDOUR_UI::instance()->session_loaded ) {
 421                                                 ARDOUR_UI::instance()->show_splash();
 422                                         }
 423                                 }
 424                         }
 425                         push_state_to_backend (true);
 426                         break;
 427 #else
 428                         push_state_to_backend (true);
 429                         hide ();
 430                         break;
 431 #endif
 432                 case RESPONSE_DELETE_EVENT:
 433                         {
 434                                 GdkEventButton ev;
 435                                 ev.type = GDK_BUTTON_PRESS;
 436                                 ev.button = 1;
 437                                 on_delete_event ((GdkEventAny*) &ev);
 438                                 break;
 439                         }
 440                 default:
 441                         hide ();
 442         }
 443 }
 444
 445 void
 446 EngineControl::build_notebook ()
 447 {
 448         Label* label;
 449         AttachOptions xopt = AttachOptions (FILL|EXPAND);
 450
 451         /* clear the table */
 452
 453         Gtkmm2ext::container_clear (basic_vbox);
 454         Gtkmm2ext::container_clear (basic_packer);
 455
 456         if (control_app_button.get_parent()) {
 457                 control_app_button.get_parent()->remove (control_app_button);
 458         }
 459
 460         label = manage (left_aligned_label (_("Audio System:")));
 461         basic_packer.attach (*label, 0, 1, 0, 1, xopt, (AttachOptions) 0);
 462         basic_packer.attach (backend_combo, 1, 2, 0, 1, xopt, (AttachOptions) 0);
 463
 464         lm_button_audio.signal_clicked.connect (sigc::mem_fun (*this, &EngineControl::calibrate_audio_latency));
 465         lm_button_audio.set_name ("generic button");
 466         lm_button_audio.set_can_focus(true);
 467
 468         if (_have_control) {
 469                 build_full_control_notebook ();
 470         } else {
 471                 build_no_control_notebook ();
 472         }
 473
 474         basic_vbox.pack_start (basic_hbox, false, false);
 475
 476         {
 477                 PBD::Unwinder<uint32_t> protect_ignore_changes (ignore_changes, ignore_changes + 1);
 478                 basic_vbox.show_all ();
 479         }
 480 }
 481
 482 void
 483 EngineControl::build_full_control_notebook ()
 484 {
 485         boost::shared_ptr<ARDOUR::AudioBackend> backend = ARDOUR::AudioEngine::instance()->current_backend();
 486         assert (backend);
 487
 488         using namespace Notebook_Helpers;
 489         Label* label;
 490         vector<string> strings;
 491         AttachOptions xopt = AttachOptions (FILL|EXPAND);
 492         int row = 1; // row zero == backend combo
 493
 494         /* start packing it up */
 495
 496         if (backend->requires_driver_selection()) {
 497                 label = manage (left_aligned_label (_("Driver:")));
 498                 basic_packer.attach (*label, 0, 1, row, row + 1, xopt, (AttachOptions) 0);
 499                 basic_packer.attach (driver_combo, 1, 2, row, row + 1, xopt, (AttachOptions) 0);
 500                 row++;
 501         }
 502
 503         if (backend->use_separate_input_and_output_devices()) {
 504                 label = manage (left_aligned_label (_("Input Device:")));
 505                 basic_packer.attach (*label, 0, 1, row, row + 1, xopt, (AttachOptions) 0);
 506                 basic_packer.attach (input_device_combo, 1, 2, row, row + 1, xopt, (AttachOptions) 0);
 507                 row++;
 508                 label = manage (left_aligned_label (_("Output Device:")));
 509                 basic_packer.attach (*label, 0, 1, row, row + 1, xopt, (AttachOptions) 0);
 510                 basic_packer.attach (output_device_combo, 1, 2, row, row + 1, xopt, (AttachOptions) 0);
 511                 row++;
 512                 // reset so it isn't used in state comparisons
 513                 device_combo.set_active_text ("");
 514         } else {
 515                 label = manage (left_aligned_label (_("Device:")));
 516                 basic_packer.attach (*label, 0, 1, row, row + 1, xopt, (AttachOptions) 0);
 517                 basic_packer.attach (device_combo, 1, 2, row, row + 1, xopt, (AttachOptions) 0);
 518                 row++;
 519                 // reset these so they don't get used in state comparisons
 520                 input_device_combo.set_active_text ("");
 521                 output_device_combo.set_active_text ("");
 522         }
 523
 524         label = manage (left_aligned_label (_("Sample rate:")));
 525         basic_packer.attach (*label, 0, 1, row, row + 1, xopt, (AttachOptions) 0);
 526         basic_packer.attach (sample_rate_combo, 1, 2, row, row + 1, xopt, (AttachOptions) 0);
 527         row++;
 528
 529
 530         label = manage (left_aligned_label (_("Buffer size:")));
 531         basic_packer.attach (*label, 0, 1, row, row + 1, xopt, (AttachOptions) 0);
 532         basic_packer.attach (buffer_size_combo, 1, 2, row, row + 1, xopt, (AttachOptions) 0);
 533         buffer_size_duration_label.set_alignment (0.0); /* left-align */
 534         basic_packer.attach (buffer_size_duration_label, 2, 3, row, row+1, SHRINK, (AttachOptions) 0);
 535
 536         /* button spans 2 rows */
 537
 538         basic_packer.attach (control_app_button, 3, 4, row-1, row+1, xopt, xopt);
 539         row++;
 540
 541         input_channels.set_name ("InputChannels");
 542         input_channels.set_flags (Gtk::CAN_FOCUS);
 543         input_channels.set_digits (0);
 544         input_channels.set_wrap (false);
 545         output_channels.set_editable (true);
 546
 547         if (!ARDOUR::Profile->get_mixbus()) {
 548                 label = manage (left_aligned_label (_("Input Channels:")));
 549                 basic_packer.attach (*label, 0, 1, row, row+1, xopt, (AttachOptions) 0);
 550                 basic_packer.attach (input_channels, 1, 2, row, row+1, xopt, (AttachOptions) 0);
 551                 ++row;
 552         }
 553
 554         output_channels.set_name ("OutputChannels");
 555         output_channels.set_flags (Gtk::CAN_FOCUS);
 556         output_channels.set_digits (0);
 557         output_channels.set_wrap (false);
 558         output_channels.set_editable (true);
 559
 560         if (!ARDOUR::Profile->get_mixbus()) {
 561                 label = manage (left_aligned_label (_("Output Channels:")));
 562                 basic_packer.attach (*label, 0, 1, row, row+1, xopt, (AttachOptions) 0);
 563                 basic_packer.attach (output_channels, 1, 2, row, row+1, xopt, (AttachOptions) 0);
 564                 ++row;
 565         }
 566
 567         input_latency.set_name ("InputLatency");
 568         input_latency.set_flags (Gtk::CAN_FOCUS);
 569         input_latency.set_digits (0);
 570         input_latency.set_wrap (false);
 571         input_latency.set_editable (true);
 572
 573         label = manage (left_aligned_label (_("Hardware input latency:")));
 574         basic_packer.attach (*label, 0, 1, row, row+1, xopt, (AttachOptions) 0);
 575         basic_packer.attach (input_latency, 1, 2, row, row+1, xopt, (AttachOptions) 0);
 576         label = manage (left_aligned_label (_("samples")));
 577         basic_packer.attach (*label, 2, 3, row, row+1, SHRINK, (AttachOptions) 0);
 578         ++row;
 579
 580         output_latency.set_name ("OutputLatency");
 581         output_latency.set_flags (Gtk::CAN_FOCUS);
 582         output_latency.set_digits (0);
 583         output_latency.set_wrap (false);
 584         output_latency.set_editable (true);
 585
 586         label = manage (left_aligned_label (_("Hardware output latency:")));
 587         basic_packer.attach (*label, 0, 1, row, row+1, xopt, (AttachOptions) 0);
 588         basic_packer.attach (output_latency, 1, 2, row, row+1, xopt, (AttachOptions) 0);
 589         label = manage (left_aligned_label (_("samples")));
 590         basic_packer.attach (*label, 2, 3, row, row+1, SHRINK, (AttachOptions) 0);
 591
 592         /* button spans 2 rows */
 593
 594         basic_packer.attach (lm_button_audio, 3, 4, row-1, row+1, xopt, xopt);
 595         ++row;
 596
 597         label = manage (left_aligned_label (_("MIDI System:")));
 598         basic_packer.attach (*label, 0, 1, row, row + 1, xopt, (AttachOptions) 0);
 599         basic_packer.attach (midi_option_combo, 1, 2, row, row + 1, SHRINK, (AttachOptions) 0);
 600         basic_packer.attach (midi_devices_button, 3, 4, row, row+1, xopt, xopt);
 601         row++;
 602 }
 603
 604 void
 605 EngineControl::build_no_control_notebook ()
 606 {
 607         boost::shared_ptr<ARDOUR::AudioBackend> backend = ARDOUR::AudioEngine::instance()->current_backend();
 608         assert (backend);
 609
 610         using namespace Notebook_Helpers;
 611         Label* label;
 612         vector<string> strings;
 613         AttachOptions xopt = AttachOptions (FILL|EXPAND);
 614         int row = 1; // row zero == backend combo
 615         const string msg = string_compose (_("%1 is already running. %2 will connect to it and use the existing settings."), backend->name(), PROGRAM_NAME);
 616
 617         label = manage (new Label);
 618         label->set_markup (string_compose ("<span weight=\"bold\" foreground=\"red\">%1</span>", msg));
 619         basic_packer.attach (*label, 0, 2, row, row + 1, xopt, (AttachOptions) 0);
 620         row++;
 621
 622         if (backend->can_change_sample_rate_when_running()) {
 623                 label = manage (left_aligned_label (_("Sample rate:")));
 624                 basic_packer.attach (*label, 0, 1, row, row + 1, xopt, (AttachOptions) 0);
 625                 basic_packer.attach (sample_rate_combo, 1, 2, row, row + 1, xopt, (AttachOptions) 0);
 626                 row++;
 627         }
 628
 629         if (backend->can_change_buffer_size_when_running()) {
 630                 label = manage (left_aligned_label (_("Buffer size:")));
 631                 basic_packer.attach (*label, 0, 1, row, row + 1, xopt, (AttachOptions) 0);
 632                 basic_packer.attach (buffer_size_combo, 1, 2, row, row + 1, xopt, (AttachOptions) 0);
 633                 buffer_size_duration_label.set_alignment (0.0); /* left-align */
 634                 basic_packer.attach (buffer_size_duration_label, 2, 3, row, row+1, xopt, (AttachOptions) 0);
 635                 row++;
 636         }
 637
 638         basic_packer.attach (connect_disconnect_button, 0, 2, row, row+1, FILL, AttachOptions (0));
 639         row++;
 640 }
 641
 642 EngineControl::~EngineControl ()
 643 {
 644         ignore_changes = true;
 645 }
 646
 647 void
 648 EngineControl::disable_latency_tab ()
 649 {
 650         vector<string> empty;
 651         set_popdown_strings (lm_output_channel_combo, empty);
 652         set_popdown_strings (lm_input_channel_combo, empty);
 653         lm_measure_button.set_sensitive (false);
 654         lm_use_button.set_sensitive (false);
 655 }
 656
 657 void
 658 EngineControl::enable_latency_tab ()
 659 {
 660         vector<string> outputs;
 661         vector<string> inputs;
 662
 663         ARDOUR::DataType const type = _measure_midi ? ARDOUR::DataType::MIDI : ARDOUR::DataType::AUDIO;
 664         ARDOUR::AudioEngine::instance()->get_physical_outputs (type, outputs);
 665         ARDOUR::AudioEngine::instance()->get_physical_inputs (type, inputs);
 666
 667         if (!ARDOUR::AudioEngine::instance()->running()) {
 668                 MessageDialog msg (_("Failed to start or connect to audio-engine.\n\nLatency calibration requires a working audio interface."));
 669                 notebook.set_current_page (0);
 670                 msg.run ();
 671                 return;
 672         }
 673         else if (inputs.empty() || outputs.empty()) {
 674                 MessageDialog msg (_("Your selected audio configuration is playback- or capture-only.\n\nLatency calibration requires playback and capture"));
 675                 notebook.set_current_page (0);
 676                 msg.run ();
 677                 return;
 678         }
 679
 680         lm_back_button_signal.disconnect();
 681         if (_measure_midi) {
 682                 lm_back_button_signal = lm_back_button.signal_clicked().connect (sigc::bind (sigc::mem_fun (notebook, &Gtk::Notebook::set_current_page), midi_tab));
 683                 lm_preamble.hide ();
 684         } else {
 685                 lm_back_button_signal = lm_back_button.signal_clicked().connect (sigc::bind (sigc::mem_fun (notebook, &Gtk::Notebook::set_current_page), 0));
 686                 lm_preamble.show ();
 687         }
 688
 689         set_popdown_strings (lm_output_channel_combo, outputs);
 690         lm_output_channel_combo.set_active_text (outputs.front());
 691         lm_output_channel_combo.set_sensitive (true);
 692
 693         set_popdown_strings (lm_input_channel_combo, inputs);
 694         lm_input_channel_combo.set_active_text (inputs.front());
 695         lm_input_channel_combo.set_sensitive (true);
 696
 697         lm_measure_button.set_sensitive (true);
 698 }
 699
 700 void
 701 EngineControl::setup_midi_tab_for_backend ()
 702 {
 703         string backend = backend_combo.get_active_text ();
 704
 705         Gtkmm2ext::container_clear (midi_vbox);
 706
 707         midi_vbox.set_border_width (12);
 708         midi_device_table.set_border_width (12);
 709
 710         if (backend == "JACK") {
 711                 setup_midi_tab_for_jack ();
 712         }
 713
 714         midi_vbox.pack_start (midi_device_table, true, true);
 715         midi_vbox.pack_start (midi_back_button, false, false);
 716         midi_vbox.show_all ();
 717 }
 718
 719 void
 720 EngineControl::setup_midi_tab_for_jack ()
 721 {
 722 }
 723
 724 void
 725 EngineControl::midi_latency_adjustment_changed (Gtk::Adjustment *a, MidiDeviceSettings device, bool for_input) {
 726         if (for_input) {
 727                 device->input_latency = a->get_value();
 728         } else {
 729                 device->output_latency = a->get_value();
 730         }
 731 }
 732
 733 void
 734 EngineControl::midi_device_enabled_toggled (ArdourButton *b, MidiDeviceSettings device) {
 735         b->set_active (!b->get_active());
 736         device->enabled = b->get_active();
 737         refresh_midi_display(device->name);
 738 }
 739
 740 void
 741 EngineControl::refresh_midi_display (std::string focus)
 742 {
 743         boost::shared_ptr<ARDOUR::AudioBackend> backend = ARDOUR::AudioEngine::instance()->current_backend();
 744         assert (backend);
 745
 746         int row  = 0;
 747         AttachOptions xopt = AttachOptions (FILL|EXPAND);
 748         Gtk::Label* l;
 749
 750         Gtkmm2ext::container_clear (midi_device_table);
 751
 752         midi_device_table.set_spacings (6);
 753
 754         l = manage (new Label);
 755         l->set_markup (string_compose ("<span size=\"large\" weight=\"bold\">%1</span>", _("MIDI Devices")));
 756         midi_device_table.attach (*l, 0, 4, row, row + 1, xopt, AttachOptions (0));
 757         l->set_alignment (0.5, 0.5);
 758         row++;
 759         l->show ();
 760
 761         l = manage (new Label (_("Device"))); l->show (); l->set_alignment (0.5, 0.5);
 762         midi_device_table.attach (*l, 0, 1, row, row + 2, xopt, AttachOptions (0));
 763         l = manage (new Label (_("Hardware Latencies"))); l->show (); l->set_alignment (0.5, 0.5);
 764         midi_device_table.attach (*l, 1, 3, row, row + 1, xopt, AttachOptions (0));
 765         row++;
 766         l = manage (new Label (_("Input"))); l->show (); l->set_alignment (0.5, 0.5);
 767         midi_device_table.attach (*l, 1, 2, row, row + 1, xopt, AttachOptions (0));
 768         l = manage (new Label (_("Output"))); l->show (); l->set_alignment (0.5, 0.5);
 769         midi_device_table.attach (*l, 2, 3, row, row + 1, xopt, AttachOptions (0));
 770         row++;
 771
 772         for (vector<MidiDeviceSettings>::const_iterator p = _midi_devices.begin(); p != _midi_devices.end(); ++p) {
 773                 ArdourButton *m;
 774                 Gtk::Button* b;
 775                 Gtk::Adjustment *a;
 776                 Gtk::SpinButton *s;
 777                 bool enabled = (*p)->enabled;
 778
 779                 m = manage (new ArdourButton ((*p)->name, ArdourButton::led_default_elements));
 780                 m->set_name ("midi device");
 781                 m->set_can_focus (Gtk::CAN_FOCUS);
 782                 m->add_events (Gdk::BUTTON_RELEASE_MASK);
 783                 m->set_active (enabled);
 784                 m->signal_clicked.connect (sigc::bind (sigc::mem_fun (*this, &EngineControl::midi_device_enabled_toggled), m, *p));
 785                 midi_device_table.attach (*m, 0, 1, row, row + 1, xopt, AttachOptions (0)); m->show ();
 786                 if ((*p)->name == focus) {
 787                         m->grab_focus();
 788                 }
 789
 790                 a = manage (new Gtk::Adjustment (0, 0, 99999, 1));
 791                 s = manage (new Gtk::SpinButton (*a));
 792                 a->set_value ((*p)->input_latency);
 793                 s->signal_value_changed().connect (sigc::bind (sigc::mem_fun (*this, &EngineControl::midi_latency_adjustment_changed), a, *p, true));
 794                 s->set_sensitive (_can_set_midi_latencies && enabled);
 795                 midi_device_table.attach (*s, 1, 2, row, row + 1, xopt, AttachOptions (0)); s->show ();
 796
 797                 a = manage (new Gtk::Adjustment (0, 0, 99999, 1));
 798                 s = manage (new Gtk::SpinButton (*a));
 799                 a->set_value ((*p)->output_latency);
 800                 s->signal_value_changed().connect (sigc::bind (sigc::mem_fun (*this, &EngineControl::midi_latency_adjustment_changed), a, *p, false));
 801                 s->set_sensitive (_can_set_midi_latencies && enabled);
 802                 midi_device_table.attach (*s, 2, 3, row, row + 1, xopt, AttachOptions (0)); s->show ();
 803
 804                 b = manage (new Button (_("Calibrate")));
 805                 b->signal_clicked().connect (sigc::bind (sigc::mem_fun (*this, &EngineControl::calibrate_midi_latency), *p));
 806                 b->set_sensitive (_can_set_midi_latencies && enabled);
 807                 midi_device_table.attach (*b, 3, 4, row, row + 1, xopt, AttachOptions (0)); b->show ();
 808
 809                 row++;
 810         }
 811 }
 812
 813 void
 814 EngineControl::backend_changed ()
 815 {
 816         SignalBlocker blocker (*this, "backend_changed");
 817         string backend_name = backend_combo.get_active_text();
 818         boost::shared_ptr<ARDOUR::AudioBackend> backend;
 819
 820         if (!(backend = ARDOUR::AudioEngine::instance()->set_backend (backend_name, "ardour", ""))) {
 821                 /* eh? setting the backend failed... how ? */
 822                 /* A: stale config contains a backend that does not exist in current build */
 823                 return;
 824         }
 825
 826         DEBUG_ECONTROL (string_compose ("Backend name: %1", backend_name));
 827
 828         _have_control = ARDOUR::AudioEngine::instance()->setup_required ();
 829
 830         build_notebook ();
 831         setup_midi_tab_for_backend ();
 832         _midi_devices.clear();
 833
 834         if (backend->requires_driver_selection()) {
 835                 if (set_driver_popdown_strings ()) {
 836                         driver_combo.set_sensitive (true);
 837                         driver_changed ();
 838                 }
 839
 840         } else {
 841                 driver_combo.set_sensitive (false);
 842                 /* this will change the device text which will cause a call to
 843                  * device changed which will set up parameters
 844                  */
 845                 list_devices ();
 846         }
 847
 848         update_midi_options ();
 849
 850         connect_disconnect_button.hide();
 851
 852         midi_option_changed();
 853
 854         started_at_least_once = false;
 855
 856         if (!ignore_changes) {
 857                 maybe_display_saved_state ();
 858         }
 859 }
 860
 861 void
 862 EngineControl::update_midi_options ()
 863 {
 864         boost::shared_ptr<ARDOUR::AudioBackend> backend = ARDOUR::AudioEngine::instance()->current_backend();
 865         vector<string> midi_options = backend->enumerate_midi_options();
 866
 867         if (midi_options.size() == 1) {
 868                 /* only contains the "none" option */
 869                 midi_option_combo.set_sensitive (false);
 870         } else {
 871                 if (_have_control) {
 872                         set_popdown_strings (midi_option_combo, midi_options);
 873                         midi_option_combo.set_active_text (midi_options.front());
 874                         midi_option_combo.set_sensitive (true);
 875                 } else {
 876                         midi_option_combo.set_sensitive (false);
 877                 }
 878         }
 879 }
 880
 881 bool
 882 EngineControl::print_channel_count (Gtk::SpinButton* sb)
 883 {
 884         if (ARDOUR::Profile->get_mixbus()) {
 885                 return true;
 886         }
 887
 888         uint32_t cnt = (uint32_t) sb->get_value();
 889         if (cnt == 0) {
 890                 sb->set_text (_("all available channels"));
 891         } else {
 892                 char buf[32];
 893                 snprintf (buf, sizeof (buf), "%d", cnt);
 894                 sb->set_text (buf);
 895         }
 896         return true;
 897 }
 898
 899 // @return true if there are drivers available
 900 bool
 901 EngineControl::set_driver_popdown_strings ()
 902 {
 903         DEBUG_ECONTROL ("set_driver_popdown_strings");
 904         boost::shared_ptr<ARDOUR::AudioBackend> backend = ARDOUR::AudioEngine::instance()->current_backend();
 905         vector<string> drivers = backend->enumerate_drivers();
 906
 907         if (drivers.empty ()) {
 908                 // This is an error...?
 909                 return false;
 910         }
 911
 912         string current_driver = backend->driver_name ();
 913
 914         DEBUG_ECONTROL (string_compose ("backend->driver_name: %1", current_driver));
 915
 916         if (std::find (drivers.begin (), drivers.end (), current_driver) ==
 917             drivers.end ()) {
 918
 919                 current_driver = drivers.front ();
 920         }
 921
 922         set_popdown_strings (driver_combo, drivers);
 923         DEBUG_ECONTROL (
 924             string_compose ("driver_combo.set_active_text: %1", current_driver));
 925         driver_combo.set_active_text (current_driver);
 926         return true;
 927 }
 928
 929 // @return true if there are devices available
 930 bool
 931 EngineControl::set_device_popdown_strings ()
 932 {
 933         DEBUG_ECONTROL ("set_device_popdown_strings");
 934         boost::shared_ptr<ARDOUR::AudioBackend> backend = ARDOUR::AudioEngine::instance()->current_backend();
 935         vector<ARDOUR::AudioBackend::DeviceStatus> all_devices = backend->enumerate_devices ();
 936
 937         /* NOTE: Ardour currently does not display the "available" field of the
 938          * returned devices.
 939          *
 940          * Doing so would require a different GUI widget than the combo
 941          * box/popdown that we currently use, since it has no way to list
 942          * items that are not selectable. Something more like a popup menu,
 943          * which could have unselectable items, would be appropriate.
 944          */
 945
 946         vector<string> available_devices;
 947
 948         for (vector<ARDOUR::AudioBackend::DeviceStatus>::const_iterator i = all_devices.begin(); i != all_devices.end(); ++i) {
 949                 available_devices.push_back (i->name);
 950         }
 951
 952         if (available_devices.empty ()) {
 953                 return false;
 954         }
 955
 956         string current_device = backend->device_name ();
 957
 958         // Make sure that backend->device_name () is a valid
 959         // device, the backend may not return a valid device if it hasn't
 960         // been set yet.
 961         if (std::find (available_devices.begin (),
 962                        available_devices.end (),
 963                        current_device) == available_devices.end ()) {
 964
 965                 current_device = available_devices.front ();
 966         }
 967
 968         set_popdown_strings (device_combo, available_devices);
 969         DEBUG_ECONTROL (
 970             string_compose ("set device_combo active text: %1", current_device));
 971
 972         device_combo.set_active_text (current_device);
 973         return true;
 974 }
 975
 976 // @return true if there are input devices available
 977 bool
 978 EngineControl::set_input_device_popdown_strings ()
 979 {
 980         DEBUG_ECONTROL ("set_input_device_popdown_strings");
 981         boost::shared_ptr<ARDOUR::AudioBackend> backend = ARDOUR::AudioEngine::instance()->current_backend();
 982         vector<ARDOUR::AudioBackend::DeviceStatus> all_devices = backend->enumerate_input_devices ();
 983
 984         vector<string> available_devices;
 985
 986         for (vector<ARDOUR::AudioBackend::DeviceStatus>::const_iterator i = all_devices.begin(); i != all_devices.end(); ++i) {
 987                 available_devices.push_back (i->name);
 988         }
 989
 990         if (available_devices.empty()) {
 991                 return false;
 992         }
 993
 994         string current_device = backend->input_device_name ();
 995
 996         // Make sure that backend->input_device_name () is a valid
 997         // device, the backend may not return a valid device if it hasn't
 998         // been set yet.
 999         if (std::find (available_devices.begin (),
1000                        available_devices.end (),
1001                        current_device) == available_devices.end ()) {
1002
1003                 current_device = available_devices.front ();
1004         }
1005
1006         set_popdown_strings (input_device_combo, available_devices);
1007
1008         DEBUG_ECONTROL (
1009             string_compose ("set input_device_combo active text: %1", current_device));
1010         input_device_combo.set_active_text (current_device);
1011         return true;
1012 }
1013
1014 // @return true if there are output devices available
1015 bool
1016 EngineControl::set_output_device_popdown_strings ()
1017 {
1018         DEBUG_ECONTROL ("set_output_device_popdown_strings");
1019         boost::shared_ptr<ARDOUR::AudioBackend> backend = ARDOUR::AudioEngine::instance()->current_backend();
1020         vector<ARDOUR::AudioBackend::DeviceStatus> all_devices = backend->enumerate_output_devices ();
1021
1022         vector<string> available_devices;
1023
1024         for (vector<ARDOUR::AudioBackend::DeviceStatus>::const_iterator i = all_devices.begin(); i != all_devices.end(); ++i) {
1025                 available_devices.push_back (i->name);
1026         }
1027
1028         if (available_devices.empty()) {
1029                 return false;
1030         }
1031
1032         string current_device = backend->output_device_name ();
1033
1034         // Make sure that backend->output_device_name () is a valid
1035         // device, the backend may not return a valid device if it hasn't
1036         // been set yet.
1037         if (std::find (available_devices.begin (),
1038                        available_devices.end (),
1039                        current_device) == available_devices.end ()) {
1040
1041                 current_device = available_devices.front ();
1042         }
1043
1044         set_popdown_strings (output_device_combo, available_devices);
1045
1046         DEBUG_ECONTROL (
1047             string_compose ("set output_device_combo active text: %1", current_device));
1048         output_device_combo.set_active_text (current_device);
1049         return true;
1050 }
1051
1052 void
1053 EngineControl::list_devices ()
1054 {
1055         DEBUG_ECONTROL ("list_devices");
1056         boost::shared_ptr<ARDOUR::AudioBackend> backend = ARDOUR::AudioEngine::instance()->current_backend();
1057         assert (backend);
1058
1059         /* now fill out devices, mark sample rates, buffer sizes insensitive */
1060
1061         bool devices_available = false;
1062
1063         if (backend->use_separate_input_and_output_devices ()) {
1064                 bool input_devices_available = set_input_device_popdown_strings ();
1065                 bool output_devices_available = set_output_device_popdown_strings ();
1066                 devices_available = input_devices_available || output_devices_available;
1067         } else {
1068                 devices_available = set_device_popdown_strings ();
1069         }
1070
1071         if (devices_available) {
1072                 device_changed ();
1073
1074                 input_latency.set_sensitive (true);
1075                 output_latency.set_sensitive (true);
1076                 input_channels.set_sensitive (true);
1077                 output_channels.set_sensitive (true);
1078
1079                 ok_button->set_sensitive (true);
1080                 apply_button->set_sensitive (true);
1081
1082         } else {
1083                 device_combo.clear();
1084                 input_device_combo.clear();
1085                 output_device_combo.clear();
1086                 sample_rate_combo.set_sensitive (false);
1087                 buffer_size_combo.set_sensitive (false);
1088                 input_latency.set_sensitive (false);
1089                 output_latency.set_sensitive (false);
1090                 input_channels.set_sensitive (false);
1091                 output_channels.set_sensitive (false);
1092                 if (_have_control) {
1093                         ok_button->set_sensitive (false);
1094                         apply_button->set_sensitive (false);
1095                 } else {
1096                         ok_button->set_sensitive (true);
1097                         apply_button->set_sensitive (true);
1098                         if (backend->can_change_sample_rate_when_running() && sample_rate_combo.get_children().size() > 0) {
1099                                 sample_rate_combo.set_sensitive (true);
1100                         }
1101                         if (backend->can_change_buffer_size_when_running() && buffer_size_combo.get_children().size() > 0) {
1102                                 buffer_size_combo.set_sensitive (true);
1103                         }
1104
1105                 }
1106         }
1107 }
1108
1109 void
1110 EngineControl::driver_changed ()
1111 {
1112         SignalBlocker blocker (*this, "driver_changed");
1113         boost::shared_ptr<ARDOUR::AudioBackend> backend = ARDOUR::AudioEngine::instance()->current_backend();
1114         assert (backend);
1115
1116         backend->set_driver (driver_combo.get_active_text());
1117         list_devices ();
1118
1119         if (!ignore_changes) {
1120                 maybe_display_saved_state ();
1121         }
1122 }
1123
1124 void
1125 EngineControl::set_samplerate_popdown_strings (const std::string& device_name)
1126 {
1127         DEBUG_ECONTROL ("set_samplerate_popdown_strings");
1128         boost::shared_ptr<ARDOUR::AudioBackend> backend = ARDOUR::AudioEngine::instance()->current_backend();
1129         string desired;
1130         vector<float> sr;
1131         vector<string> s;
1132
1133         if (_have_control) {
1134                 sr = backend->available_sample_rates (device_name);
1135         } else {
1136
1137                 sr.push_back (8000.0f);
1138                 sr.push_back (16000.0f);
1139                 sr.push_back (32000.0f);
1140                 sr.push_back (44100.0f);
1141                 sr.push_back (48000.0f);
1142                 sr.push_back (88200.0f);
1143                 sr.push_back (96000.0f);
1144                 sr.push_back (192000.0f);
1145                 sr.push_back (384000.0f);
1146         }
1147
1148         for (vector<float>::const_iterator x = sr.begin(); x != sr.end(); ++x) {
1149                 s.push_back (rate_as_string (*x));
1150                 if (*x == _desired_sample_rate) {
1151                         desired = s.back();
1152                 }
1153         }
1154
1155         if (!s.empty()) {
1156                 sample_rate_combo.set_sensitive (true);
1157                 set_popdown_strings (sample_rate_combo, s);
1158
1159                 if (desired.empty()) {
1160                         sample_rate_combo.set_active_text (rate_as_string (backend->default_sample_rate()));
1161                 } else {
1162                         sample_rate_combo.set_active_text (desired);
1163                 }
1164
1165         } else {
1166                 sample_rate_combo.set_sensitive (false);
1167         }
1168 }
1169
1170 void
1171 EngineControl::set_buffersize_popdown_strings (const std::string& device_name)
1172 {
1173         DEBUG_ECONTROL ("set_buffersize_popdown_strings");
1174         boost::shared_ptr<ARDOUR::AudioBackend> backend = ARDOUR::AudioEngine::instance()->current_backend();
1175         vector<uint32_t> bs;
1176         vector<string> s;
1177
1178         if (_have_control) {
1179                 bs = backend->available_buffer_sizes (device_name);
1180         } else if (backend->can_change_buffer_size_when_running()) {
1181                 bs.push_back (8);
1182                 bs.push_back (16);
1183                 bs.push_back (32);
1184                 bs.push_back (64);
1185                 bs.push_back (128);
1186                 bs.push_back (256);
1187                 bs.push_back (512);
1188                 bs.push_back (1024);
1189                 bs.push_back (2048);
1190                 bs.push_back (4096);
1191                 bs.push_back (8192);
1192         }
1193
1194         for (vector<uint32_t>::const_iterator x = bs.begin(); x != bs.end(); ++x) {
1195                 s.push_back (bufsize_as_string (*x));
1196         }
1197
1198         if (!s.empty()) {
1199                 buffer_size_combo.set_sensitive (true);
1200                 set_popdown_strings (buffer_size_combo, s);
1201                 buffer_size_combo.set_active_text (s.front());
1202
1203                 uint32_t period = backend->buffer_size();
1204                 if (0 == period) {
1205                         period = backend->default_buffer_size(device_name);
1206                 }
1207                 set_active_text_if_present (buffer_size_combo, bufsize_as_string (period));
1208                 show_buffer_duration ();
1209         } else {
1210                 buffer_size_combo.set_sensitive (false);
1211         }
1212 }
1213
1214 void
1215 EngineControl::device_changed ()
1216 {
1217         SignalBlocker blocker (*this, "device_changed");
1218         boost::shared_ptr<ARDOUR::AudioBackend> backend = ARDOUR::AudioEngine::instance()->current_backend();
1219         assert (backend);
1220
1221         string device_name_in;
1222         string device_name_out; // only used if backend support separate I/O devices
1223
1224         if (backend->use_separate_input_and_output_devices()) {
1225                 device_name_in  = get_input_device_name ();
1226                 device_name_out = get_output_device_name ();
1227         } else {
1228                 device_name_in = get_device_name ();
1229         }
1230
1231         /* we set the backend-device to query various device related intormation.
1232          * This has the side effect that backend->device_name() will match
1233          * the device_name and  'change_device' will never be true.
1234          * so work around this by setting...
1235          */
1236         if (backend->use_separate_input_and_output_devices()) {
1237                 if (device_name_in != backend->input_device_name() || device_name_out != backend->output_device_name ()) {
1238                         queue_device_changed = true;
1239                 }
1240         } else {
1241                 if (device_name_in != backend->device_name()) {
1242                         queue_device_changed = true;
1243                 }
1244         }
1245
1246         //the device name must be set FIRST so ASIO can populate buffersizes and the control panel button
1247         if (backend->use_separate_input_and_output_devices()) {
1248                 backend->set_input_device_name (device_name_in);
1249                 backend->set_output_device_name (device_name_out);
1250         } else {
1251                 backend->set_device_name(device_name_in);
1252         }
1253
1254         {
1255                 /* don't allow programmatic change to combos to cause a
1256                    recursive call to this method.
1257                  */
1258                 PBD::Unwinder<uint32_t> protect_ignore_changes (ignore_changes, ignore_changes + 1);
1259
1260                 /* backends that support separate devices, need to ignore
1261                  * the device-name - and use the devies set above
1262                  */
1263                 set_samplerate_popdown_strings (device_name_in);
1264                 set_buffersize_popdown_strings (device_name_in);
1265                 /* XXX theoretically need to set min + max channel counts here
1266                 */
1267
1268                 manage_control_app_sensitivity ();
1269         }
1270
1271         /* pick up any saved state for this device */
1272
1273         if (!ignore_changes) {
1274                 maybe_display_saved_state ();
1275         }
1276 }
1277
1278 void
1279 EngineControl::input_device_changed ()
1280 {
1281         DEBUG_ECONTROL ("input_device_changed");
1282         device_changed ();
1283 }
1284
1285 void
1286 EngineControl::output_device_changed ()
1287 {
1288         DEBUG_ECONTROL ("output_device_changed");
1289         device_changed ();
1290 }
1291
1292 string
1293 EngineControl::bufsize_as_string (uint32_t sz)
1294 {
1295         /* Translators: "samples" is always plural here, so no
1296            need for plural+singular forms.
1297          */
1298         char buf[64];
1299         snprintf (buf, sizeof (buf), "%u %s", sz, P_("sample", "samples", sz));
1300         return buf;
1301 }
1302
1303 void
1304 EngineControl::sample_rate_changed ()
1305 {
1306         DEBUG_ECONTROL ("sample_rate_changed");
1307         /* reset the strings for buffer size to show the correct msec value
1308            (reflecting the new sample rate).
1309          */
1310
1311         show_buffer_duration ();
1312
1313 }
1314
1315 void
1316 EngineControl::buffer_size_changed ()
1317 {
1318         DEBUG_ECONTROL ("buffer_size_changed");
1319         show_buffer_duration ();
1320 }
1321
1322 void
1323 EngineControl::show_buffer_duration ()
1324 {
1325         DEBUG_ECONTROL ("show_buffer_duration");
1326         /* buffer sizes  - convert from just samples to samples + msecs for
1327          * the displayed string
1328          */
1329
1330         string bs_text = buffer_size_combo.get_active_text ();
1331         uint32_t samples = atoi (bs_text); /* will ignore trailing text */
1332         uint32_t rate = get_rate();
1333
1334         /* Developers: note the hard-coding of a double buffered model
1335            in the (2 * samples) computation of latency. we always start
1336            the audiobackend in this configuration.
1337          */
1338         /* note to jack1 developers: ardour also always starts the engine
1339          * in async mode (no jack2 --sync option) which adds an extra cycle
1340          * of latency with jack2 (and *3 would be correct)
1341          * The value can also be wrong if jackd is started externally..
1342          *
1343          * At the time of writing the ALSA backend always uses double-buffering *2,
1344          * The Dummy backend *1, and who knows what ASIO really does :)
1345          *
1346          * So just display the period size, that's also what
1347          * ARDOUR_UI::update_sample_rate() does for the status bar.
1348          * (the statusbar calls AudioEngine::instance()->usecs_per_cycle()
1349          * but still, that's the buffer period, not [round-trip] latency)
1350          */
1351         char buf[32];
1352         snprintf (buf, sizeof (buf), _("(%.1f ms)"), (samples / (rate/1000.0f)));
1353         buffer_size_duration_label.set_text (buf);
1354 }
1355
1356 void
1357 EngineControl::midi_option_changed ()
1358 {
1359         DEBUG_ECONTROL ("midi_option_changed");
1360         boost::shared_ptr<ARDOUR::AudioBackend> backend = ARDOUR::AudioEngine::instance()->current_backend();
1361         assert (backend);
1362
1363         backend->set_midi_option (get_midi_option());
1364
1365         vector<ARDOUR::AudioBackend::DeviceStatus> midi_devices = backend->enumerate_midi_devices();
1366
1367         //_midi_devices.clear(); // TODO merge with state-saved settings..
1368         _can_set_midi_latencies = backend->can_set_systemic_midi_latencies();
1369         std::vector<MidiDeviceSettings> new_devices;
1370
1371         for (vector<ARDOUR::AudioBackend::DeviceStatus>::const_iterator i = midi_devices.begin(); i != midi_devices.end(); ++i) {
1372                 MidiDeviceSettings mds = find_midi_device (i->name);
1373                 if (i->available && !mds) {
1374                         uint32_t input_latency = 0;
1375                         uint32_t output_latency = 0;
1376                         if (_can_set_midi_latencies) {
1377                                 input_latency = backend->systemic_midi_input_latency (i->name);
1378                                 output_latency = backend->systemic_midi_output_latency (i->name);
1379                         }
1380                         bool enabled = backend->midi_device_enabled (i->name);
1381                         MidiDeviceSettings ptr (new MidiDeviceSetting (i->name, enabled, input_latency, output_latency));
1382                         new_devices.push_back (ptr);
1383                 } else if (i->available) {
1384                         new_devices.push_back (mds);
1385                 }
1386         }
1387         _midi_devices = new_devices;
1388
1389         if (_midi_devices.empty()) {
1390                 midi_devices_button.set_sensitive (false);
1391         } else {
1392                 midi_devices_button.set_sensitive (true);
1393         }
1394 }
1395
1396 void
1397 EngineControl::parameter_changed ()
1398 {
1399 }
1400
1401 EngineControl::State
1402 EngineControl::get_matching_state (
1403                 const string& backend,
1404                 const string& driver,
1405                 const string& device)
1406 {
1407         for (StateList::iterator i = states.begin(); i != states.end(); ++i) {
1408                 if ((*i)->backend == backend &&
1409                                 (!_have_control || ((*i)->driver == driver && (*i)->device == device)))
1410                 {
1411                         return (*i);
1412                 }
1413         }
1414         return State();
1415 }
1416
1417 EngineControl::State
1418 EngineControl::get_matching_state (
1419                 const string& backend,
1420                 const string& driver,
1421                 const string& input_device,
1422                 const string& output_device)
1423 {
1424         for (StateList::iterator i = states.begin(); i != states.end(); ++i) {
1425                 if ((*i)->backend == backend &&
1426                                 (!_have_control || ((*i)->driver == driver && ((*i)->input_device == input_device) && (*i)->output_device == output_device)))
1427                 {
1428                         return (*i);
1429                 }
1430         }
1431         return State();
1432 }
1433
1434 EngineControl::State
1435 EngineControl::get_saved_state_for_currently_displayed_backend_and_device ()
1436 {
1437         boost::shared_ptr<ARDOUR::AudioBackend> backend = ARDOUR::AudioEngine::instance()->current_backend();
1438
1439         if (backend) {
1440                 if (backend->use_separate_input_and_output_devices ()) {
1441                         return get_matching_state (backend_combo.get_active_text(),
1442                                         (backend->requires_driver_selection() ? (std::string) driver_combo.get_active_text() : string()),
1443                                         input_device_combo.get_active_text(),
1444                                         output_device_combo.get_active_text());
1445                 } else {
1446                         return get_matching_state (backend_combo.get_active_text(),
1447                                         (backend->requires_driver_selection() ? (std::string) driver_combo.get_active_text() : string()),
1448                                         device_combo.get_active_text());
1449                 }
1450         }
1451
1452         return get_matching_state (backend_combo.get_active_text(),
1453                         string(),
1454                         device_combo.get_active_text());
1455 }
1456
1457 bool EngineControl::equivalent_states (const EngineControl::State& state1,
1458                                        const EngineControl::State& state2)
1459 {
1460         if (state1->backend == state2->backend &&
1461                         state1->driver == state2->driver &&
1462                         state1->device == state2->device &&
1463                         state1->input_device == state2->input_device &&
1464                         state1->output_device == state2->output_device) {
1465                 return true;
1466         }
1467         return false;
1468 }
1469
1470 EngineControl::State
1471 EngineControl::save_state ()
1472 {
1473         State state;
1474
1475         if (!_have_control) {
1476                 state = get_matching_state (backend_combo.get_active_text(), string(), string());
1477                 if (state) {
1478                         return state;
1479                 }
1480                 state.reset(new StateStruct);
1481                 state->backend = get_backend ();
1482         } else {
1483                 state.reset(new StateStruct);
1484                 store_state (state);
1485         }
1486
1487         for (StateList::iterator i = states.begin(); i != states.end();) {
1488                 if (equivalent_states (*i, state)) {
1489                         i =  states.erase(i);
1490                 } else {
1491                         ++i;
1492                 }
1493         }
1494
1495         states.push_back (state);
1496
1497         return state;
1498 }
1499
1500 void
1501 EngineControl::store_state (State state)
1502 {
1503         state->backend = get_backend ();
1504         state->driver = get_driver ();
1505         state->device = get_device_name ();
1506         state->input_device = get_input_device_name ();
1507         state->output_device = get_output_device_name ();
1508         state->sample_rate = get_rate ();
1509         state->buffer_size = get_buffer_size ();
1510         state->input_latency = get_input_latency ();
1511         state->output_latency = get_output_latency ();
1512         state->input_channels = get_input_channels ();
1513         state->output_channels = get_output_channels ();
1514         state->midi_option = get_midi_option ();
1515         state->midi_devices = _midi_devices;
1516 }
1517
1518 void
1519 EngineControl::maybe_display_saved_state ()
1520 {
1521         if (!_have_control) {
1522                 return;
1523         }
1524
1525         State state = get_saved_state_for_currently_displayed_backend_and_device ();
1526
1527         if (state) {
1528                 PBD::Unwinder<uint32_t> protect_ignore_changes (ignore_changes, ignore_changes + 1);
1529
1530                 if (!_desired_sample_rate) {
1531                         sample_rate_combo.set_active_text (rate_as_string (state->sample_rate));
1532                 }
1533                 set_active_text_if_present (buffer_size_combo, bufsize_as_string (state->buffer_size));
1534                 /* call this explicitly because we're ignoring changes to
1535                    the controls at this point.
1536                  */
1537                 show_buffer_duration ();
1538                 input_latency.set_value (state->input_latency);
1539                 output_latency.set_value (state->output_latency);
1540
1541                 if (!state->midi_option.empty()) {
1542                         midi_option_combo.set_active_text (state->midi_option);
1543                         _midi_devices = state->midi_devices;
1544                 }
1545         }
1546 }
1547
1548 XMLNode&
1549 EngineControl::get_state ()
1550 {
1551         LocaleGuard lg (X_("C"));
1552
1553         XMLNode* root = new XMLNode ("AudioMIDISetup");
1554         std::string path;
1555
1556         if (!states.empty()) {
1557                 XMLNode* state_nodes = new XMLNode ("EngineStates");
1558
1559                 for (StateList::const_iterator i = states.begin(); i != states.end(); ++i) {
1560
1561                         XMLNode* node = new XMLNode ("State");
1562
1563                         node->add_property ("backend", (*i)->backend);
1564                         node->add_property ("driver", (*i)->driver);
1565                         node->add_property ("device", (*i)->device);
1566                         node->add_property ("input-device", (*i)->input_device);
1567                         node->add_property ("output-device", (*i)->output_device);
1568                         node->add_property ("sample-rate", (*i)->sample_rate);
1569                         node->add_property ("buffer-size", (*i)->buffer_size);
1570                         node->add_property ("input-latency", (*i)->input_latency);
1571                         node->add_property ("output-latency", (*i)->output_latency);
1572                         node->add_property ("input-channels", (*i)->input_channels);
1573                         node->add_property ("output-channels", (*i)->output_channels);
1574                         node->add_property ("active", (*i)->active ? "yes" : "no");
1575                         node->add_property ("midi-option", (*i)->midi_option);
1576
1577                         XMLNode* midi_devices = new XMLNode ("MIDIDevices");
1578                         for (std::vector<MidiDeviceSettings>::const_iterator p = (*i)->midi_devices.begin(); p != (*i)->midi_devices.end(); ++p) {
1579                                 XMLNode* midi_device_stuff = new XMLNode ("MIDIDevice");
1580                                 midi_device_stuff->add_property (X_("name"), (*p)->name);
1581                                 midi_device_stuff->add_property (X_("enabled"), (*p)->enabled);
1582                                 midi_device_stuff->add_property (X_("input-latency"), (*p)->input_latency);
1583                                 midi_device_stuff->add_property (X_("output-latency"), (*p)->output_latency);
1584                                 midi_devices->add_child_nocopy (*midi_device_stuff);
1585                         }
1586                         node->add_child_nocopy (*midi_devices);
1587
1588                         state_nodes->add_child_nocopy (*node);
1589                 }
1590
1591                 root->add_child_nocopy (*state_nodes);
1592         }
1593
1594         return *root;
1595 }
1596
1597 void
1598 EngineControl::set_default_state ()
1599 {
1600         vector<string> backend_names;
1601         vector<const ARDOUR::AudioBackendInfo*> backends = ARDOUR::AudioEngine::instance()->available_backends();
1602
1603         for (vector<const ARDOUR::AudioBackendInfo*>::const_iterator b = backends.begin(); b != backends.end(); ++b) {
1604                 backend_names.push_back ((*b)->name);
1605         }
1606         backend_combo.set_active_text (backend_names.front());
1607
1608         // We could set default backends per platform etc here
1609
1610         backend_changed ();
1611 }
1612
1613 bool
1614 EngineControl::set_state (const XMLNode& root)
1615 {
1616         XMLNodeList          clist, cclist;
1617         XMLNodeConstIterator citer, cciter;
1618         XMLNode* child;
1619         XMLNode* grandchild;
1620         XMLProperty* prop = NULL;
1621
1622         fprintf (stderr, "EngineControl::set_state\n");
1623
1624         if (root.name() != "AudioMIDISetup") {
1625                 return false;
1626         }
1627
1628         clist = root.children();
1629
1630         states.clear ();
1631
1632         for (citer = clist.begin(); citer != clist.end(); ++citer) {
1633
1634                 child = *citer;
1635
1636                 if (child->name() != "EngineStates") {
1637                         continue;
1638                 }
1639
1640                 cclist = child->children();
1641
1642                 for (cciter = cclist.begin(); cciter != cclist.end(); ++cciter) {
1643                         State state (new StateStruct);
1644
1645                         grandchild = *cciter;
1646
1647                         if (grandchild->name() != "State") {
1648                                 continue;
1649                         }
1650
1651                         if ((prop = grandchild->property ("backend")) == 0) {
1652                                 continue;
1653                         }
1654                         state->backend = prop->value ();
1655
1656                         if ((prop = grandchild->property ("driver")) == 0) {
1657                                 continue;
1658                         }
1659                         state->driver = prop->value ();
1660
1661                         if ((prop = grandchild->property ("device")) == 0) {
1662                                 continue;
1663                         }
1664                         state->device = prop->value ();
1665
1666                         if ((prop = grandchild->property ("input-device")) == 0) {
1667                                 continue;
1668                         }
1669                         state->input_device = prop->value ();
1670
1671                         if ((prop = grandchild->property ("output-device")) == 0) {
1672                                 continue;
1673                         }
1674                         state->output_device = prop->value ();
1675
1676                         if ((prop = grandchild->property ("sample-rate")) == 0) {
1677                                 continue;
1678                         }
1679                         state->sample_rate = atof (prop->value ());
1680
1681                         if ((prop = grandchild->property ("buffer-size")) == 0) {
1682                                 continue;
1683                         }
1684                         state->buffer_size = atoi (prop->value ());
1685
1686                         if ((prop = grandchild->property ("input-latency")) == 0) {
1687                                 continue;
1688                         }
1689                         state->input_latency = atoi (prop->value ());
1690
1691                         if ((prop = grandchild->property ("output-latency")) == 0) {
1692                                 continue;
1693                         }
1694                         state->output_latency = atoi (prop->value ());
1695
1696                         if ((prop = grandchild->property ("input-channels")) == 0) {
1697                                 continue;
1698                         }
1699                         state->input_channels = atoi (prop->value ());
1700
1701                         if ((prop = grandchild->property ("output-channels")) == 0) {
1702                                 continue;
1703                         }
1704                         state->output_channels = atoi (prop->value ());
1705
1706                         if ((prop = grandchild->property ("active")) == 0) {
1707                                 continue;
1708                         }
1709                         state->active = string_is_affirmative (prop->value ());
1710
1711                         if ((prop = grandchild->property ("midi-option")) == 0) {
1712                                 continue;
1713                         }
1714                         state->midi_option = prop->value ();
1715
1716                         state->midi_devices.clear();
1717                         XMLNode* midinode;
1718                         if ((midinode = ARDOUR::find_named_node (*grandchild, "MIDIDevices")) != 0) {
1719                                 const XMLNodeList mnc = midinode->children();
1720                                 for (XMLNodeList::const_iterator n = mnc.begin(); n != mnc.end(); ++n) {
1721                                         if ((*n)->property (X_("name")) == 0
1722                                                         || (*n)->property (X_("enabled")) == 0
1723                                                         || (*n)->property (X_("input-latency")) == 0
1724                                                         || (*n)->property (X_("output-latency")) == 0
1725                                                  ) {
1726                                                 continue;
1727                                         }
1728
1729                                         MidiDeviceSettings ptr (new MidiDeviceSetting(
1730                                                                 (*n)->property (X_("name"))->value (),
1731                                                                 string_is_affirmative ((*n)->property (X_("enabled"))->value ()),
1732                                                                 atoi ((*n)->property (X_("input-latency"))->value ()),
1733                                                                 atoi ((*n)->property (X_("output-latency"))->value ())
1734                                                                 ));
1735                                         state->midi_devices.push_back (ptr);
1736                                 }
1737                         }
1738
1739 #if 1
1740                         /* remove accumulated duplicates (due to bug in ealier version)
1741                          * this can be removed again before release
1742                          */
1743                         for (StateList::iterator i = states.begin(); i != states.end();) {
1744                                 if ((*i)->backend == state->backend &&
1745                                                 (*i)->driver == state->driver &&
1746                                                 (*i)->device == state->device) {
1747                                         i =  states.erase(i);
1748                                 } else {
1749                                         ++i;
1750                                 }
1751                         }
1752 #endif
1753
1754                         states.push_back (state);
1755                 }
1756         }
1757
1758         /* now see if there was an active state and switch the setup to it */
1759
1760         // purge states of backend that are not available in this built
1761         vector<const ARDOUR::AudioBackendInfo*> backends = ARDOUR::AudioEngine::instance()->available_backends();
1762         vector<std::string> backend_names;
1763
1764         for (vector<const ARDOUR::AudioBackendInfo*>::const_iterator i = backends.begin(); i != backends.end(); ++i) {
1765                 backend_names.push_back((*i)->name);
1766         }
1767         for (StateList::iterator i = states.begin(); i != states.end();) {
1768                 if (std::find(backend_names.begin(), backend_names.end(), (*i)->backend) == backend_names.end()) {
1769                         i = states.erase(i);
1770                 } else {
1771                         ++i;
1772                 }
1773         }
1774
1775         for (StateList::const_iterator i = states.begin(); i != states.end(); ++i) {
1776
1777                 if ((*i)->active) {
1778                         return set_current_state (*i);
1779                 }
1780         }
1781         return false;
1782 }
1783
1784 bool
1785 EngineControl::set_current_state (const State& state)
1786 {
1787         DEBUG_ECONTROL ("set_current_state");
1788
1789         boost::shared_ptr<ARDOUR::AudioBackend> backend;
1790
1791         if (!(backend = ARDOUR::AudioEngine::instance ()->set_backend (
1792                   state->backend, "ardour", ""))) {
1793                 DEBUG_ECONTROL (string_compose ("Unable to set backend to %1", state->backend));
1794                 // this shouldn't happen as the invalid backend names should have been
1795                 // removed from the list of states.
1796                 return false;
1797         }
1798
1799         // now reflect the change in the backend in the GUI so backend_changed will
1800         // do the right thing
1801         backend_combo.set_active_text (state->backend);
1802
1803         if (!state->driver.empty ()) {
1804                 if (!backend->requires_driver_selection ()) {
1805                         DEBUG_ECONTROL ("Backend should require driver selection");
1806                         // A backend has changed from having driver selection to not having
1807                         // it or someone has been manually editing a config file and messed
1808                         // it up
1809                         return false;
1810                 }
1811
1812                 if (backend->set_driver (state->driver) != 0) {
1813                         DEBUG_ECONTROL (string_compose ("Unable to set driver %1", state->driver));
1814                         // Driver names for a backend have changed and the name in the
1815                         // config file is now invalid or support for driver is no longer
1816                         // included in the backend
1817                         return false;
1818                 }
1819                 // no need to set the driver_combo as backend_changed will use
1820                 // backend->driver_name to set the active driver
1821         }
1822
1823         if (!state->device.empty ()) {
1824                 if (backend->set_device_name (state->device) != 0) {
1825                         DEBUG_ECONTROL (
1826                             string_compose ("Unable to set device name %1", state->device));
1827                         // device is no longer available on the system
1828                         return false;
1829                 }
1830                 // no need to set active device as it will be picked up in
1831                 // via backend_changed ()/set_device_popdown_strings
1832
1833         } else {
1834                 // backend supports separate input/output devices
1835                 if (backend->set_input_device_name (state->input_device) != 0) {
1836                         DEBUG_ECONTROL (string_compose ("Unable to set input device name %1",
1837                                                         state->input_device));
1838                         // input device is no longer available on the system
1839                         return false;
1840                 }
1841
1842                 if (backend->set_output_device_name (state->output_device) != 0) {
1843                         DEBUG_ECONTROL (string_compose ("Unable to set output device name %1",
1844                                                         state->input_device));
1845                         // output device is no longer available on the system
1846                         return false;
1847                 }
1848                 // no need to set active devices as it will be picked up in via
1849                 // backend_changed ()/set_*_device_popdown_strings
1850         }
1851
1852         backend_changed ();
1853
1854         // Now restore the state of the rest of the controls
1855
1856         // We don't use a SignalBlocker as set_current_state is currently only
1857         // called from set_state before any signals are connected. If at some point
1858         // a more general named state mechanism is implemented and
1859         // set_current_state is called while signals are connected then a
1860         // SignalBlocker will need to be instantiated before setting these.
1861
1862         device_combo.set_active_text (state->device);
1863         input_device_combo.set_active_text (state->input_device);
1864         output_device_combo.set_active_text (state->output_device);
1865         sample_rate_combo.set_active_text (rate_as_string (state->sample_rate));
1866         set_active_text_if_present (buffer_size_combo, bufsize_as_string (state->buffer_size));
1867         input_latency.set_value (state->input_latency);
1868         output_latency.set_value (state->output_latency);
1869         midi_option_combo.set_active_text (state->midi_option);
1870         return true;
1871 }
1872
1873 int
1874 EngineControl::push_state_to_backend (bool start)
1875 {
1876         DEBUG_ECONTROL ("push_state_to_backend");
1877         boost::shared_ptr<ARDOUR::AudioBackend> backend = ARDOUR::AudioEngine::instance()->current_backend();
1878
1879         if (!backend) {
1880                 return 0;
1881         }
1882
1883         /* figure out what is going to change */
1884
1885         bool restart_required = false;
1886         bool was_running = ARDOUR::AudioEngine::instance()->running();
1887         bool change_driver = false;
1888         bool change_device = false;
1889         bool change_rate = false;
1890         bool change_bufsize = false;
1891         bool change_latency = false;
1892         bool change_channels = false;
1893         bool change_midi = false;
1894
1895         uint32_t ochan = get_output_channels ();
1896         uint32_t ichan = get_input_channels ();
1897
1898         if (_have_control) {
1899
1900                 if (started_at_least_once) {
1901
1902                         /* we can control the backend */
1903
1904                         if (backend->requires_driver_selection()) {
1905                                 if (get_driver() != backend->driver_name()) {
1906                                         change_driver = true;
1907                                 }
1908                         }
1909
1910                         if (backend->use_separate_input_and_output_devices()) {
1911                                 if (get_input_device_name() != backend->input_device_name()) {
1912                                         change_device = true;
1913                                 }
1914                                 if (get_output_device_name() != backend->output_device_name()) {
1915                                         change_device = true;
1916                                 }
1917                         } else {
1918                                 if (get_device_name() != backend->device_name()) {
1919                                         change_device = true;
1920                                 }
1921                         }
1922
1923                         if (queue_device_changed) {
1924                                 change_device = true;
1925                         }
1926
1927                         if (get_rate() != backend->sample_rate()) {
1928                                 change_rate = true;
1929                         }
1930
1931                         if (get_buffer_size() != backend->buffer_size()) {
1932                                 change_bufsize = true;
1933                         }
1934
1935                         if (get_midi_option() != backend->midi_option()) {
1936                                 change_midi = true;
1937                         }
1938
1939                         /* zero-requested channels means "all available" */
1940
1941                         if (ichan == 0) {
1942                                 ichan = backend->input_channels();
1943                         }
1944
1945                         if (ochan == 0) {
1946                                 ochan = backend->output_channels();
1947                         }
1948
1949                         if (ichan != backend->input_channels()) {
1950                                 change_channels = true;
1951                         }
1952
1953                         if (ochan != backend->output_channels()) {
1954                                 change_channels = true;
1955                         }
1956
1957                         if (get_input_latency() != backend->systemic_input_latency() ||
1958                                         get_output_latency() != backend->systemic_output_latency()) {
1959                                 change_latency = true;
1960                         }
1961                 } else {
1962                         /* backend never started, so we have to force a group
1963                            of settings.
1964                          */
1965                         change_device = true;
1966                         if (backend->requires_driver_selection()) {
1967                                 change_driver = true;
1968                         }
1969                         change_rate = true;
1970                         change_bufsize = true;
1971                         change_channels = true;
1972                         change_latency = true;
1973                         change_midi = true;
1974                 }
1975
1976         } else {
1977
1978                 /* we have no control over the backend, meaning that we can
1979                  * only possibly change sample rate and buffer size.
1980                  */
1981
1982
1983                 if (get_rate() != backend->sample_rate()) {
1984                         change_bufsize = true;
1985                 }
1986
1987                 if (get_buffer_size() != backend->buffer_size()) {
1988                         change_bufsize = true;
1989                 }
1990         }
1991
1992         queue_device_changed = false;
1993
1994         if (!_have_control) {
1995
1996                 /* We do not have control over the backend, so the best we can
1997                  * do is try to change the sample rate and/or bufsize and get
1998                  * out of here.
1999                  */
2000
2001                 if (change_rate && !backend->can_change_sample_rate_when_running()) {
2002                         return 1;
2003                 }
2004
2005                 if (change_bufsize && !backend->can_change_buffer_size_when_running()) {
2006                         return 1;
2007                 }
2008
2009                 if (change_rate) {
2010                         backend->set_sample_rate (get_rate());
2011                 }
2012
2013                 if (change_bufsize) {
2014                         backend->set_buffer_size (get_buffer_size());
2015                 }
2016
2017                 if (start) {
2018                         if (ARDOUR::AudioEngine::instance()->start ()) {
2019                                 error << string_compose (_("Could not start backend engine %1"), backend->name()) << endmsg;
2020                                 return -1;
2021                         }
2022                 }
2023
2024                 post_push ();
2025
2026                 return 0;
2027         }
2028
2029         /* determine if we need to stop the backend before changing parameters */
2030
2031         if (change_driver || change_device || change_channels || change_latency ||
2032                         (change_rate && !backend->can_change_sample_rate_when_running()) ||
2033                         change_midi ||
2034                         (change_bufsize && !backend->can_change_buffer_size_when_running())) {
2035                 restart_required = true;
2036         } else {
2037                 restart_required = false;
2038         }
2039
2040         if (was_running) {
2041
2042                 if (!change_driver && !change_device && !change_channels && !change_latency && !change_midi) {
2043                         /* no changes in any parameters that absolutely require a
2044                          * restart, so check those that might be changeable without a
2045                          * restart
2046                          */
2047
2048                         if (change_rate && !backend->can_change_sample_rate_when_running()) {
2049                                 /* can't do this while running ... */
2050                                 restart_required = true;
2051                         }
2052
2053                         if (change_bufsize && !backend->can_change_buffer_size_when_running()) {
2054                                 /* can't do this while running ... */
2055                                 restart_required = true;
2056                         }
2057                 }
2058         }
2059
2060         if (was_running) {
2061                 if (restart_required) {
2062                         if (ARDOUR_UI::instance()->disconnect_from_engine ()) {
2063                                 return -1;
2064                         }
2065                 }
2066         }
2067
2068
2069         if (change_driver && backend->set_driver (get_driver())) {
2070                 error << string_compose (_("Cannot set driver to %1"), get_driver()) << endmsg;
2071                 return -1;
2072         }
2073         if (backend->use_separate_input_and_output_devices()) {
2074                 if (change_device && backend->set_input_device_name (get_input_device_name())) {
2075                         error << string_compose (_("Cannot set input device name to %1"), get_input_device_name()) << endmsg;
2076                         return -1;
2077                 }
2078                 if (change_device && backend->set_output_device_name (get_output_device_name())) {
2079                         error << string_compose (_("Cannot set output device name to %1"), get_output_device_name()) << endmsg;
2080                         return -1;
2081                 }
2082         } else {
2083                 if (change_device && backend->set_device_name (get_device_name())) {
2084                         error << string_compose (_("Cannot set device name to %1"), get_device_name()) << endmsg;
2085                         return -1;
2086                 }
2087         }
2088         if (change_rate && backend->set_sample_rate (get_rate())) {
2089                 error << string_compose (_("Cannot set sample rate to %1"), get_rate()) << endmsg;
2090                 return -1;
2091         }
2092         if (change_bufsize && backend->set_buffer_size (get_buffer_size())) {
2093                 error << string_compose (_("Cannot set buffer size to %1"), get_buffer_size()) << endmsg;
2094                 return -1;
2095         }
2096
2097         if (change_channels || get_input_channels() == 0 || get_output_channels() == 0) {
2098                 if (backend->set_input_channels (get_input_channels())) {
2099                         error << string_compose (_("Cannot set input channels to %1"), get_input_channels()) << endmsg;
2100                         return -1;
2101                 }
2102                 if (backend->set_output_channels (get_output_channels())) {
2103                         error << string_compose (_("Cannot set output channels to %1"), get_output_channels()) << endmsg;
2104                         return -1;
2105                 }
2106         }
2107         if (change_latency) {
2108                 if (backend->set_systemic_input_latency (get_input_latency())) {
2109                         error << string_compose (_("Cannot set input latency to %1"), get_input_latency()) << endmsg;
2110                         return -1;
2111                 }
2112                 if (backend->set_systemic_output_latency (get_output_latency())) {
2113                         error << string_compose (_("Cannot set output latency to %1"), get_output_latency()) << endmsg;
2114                         return -1;
2115                 }
2116         }
2117
2118         if (change_midi) {
2119                 backend->set_midi_option (get_midi_option());
2120         }
2121
2122         if (1 /* TODO */) {
2123                 for (vector<MidiDeviceSettings>::const_iterator p = _midi_devices.begin(); p != _midi_devices.end(); ++p) {
2124                         if (_measure_midi) {
2125                                 if (*p == _measure_midi) {
2126                                         backend->set_midi_device_enabled ((*p)->name, true);
2127                                 } else {
2128                                         backend->set_midi_device_enabled ((*p)->name, false);
2129                                 }
2130                                 continue;
2131                         }
2132                         backend->set_midi_device_enabled ((*p)->name, (*p)->enabled);
2133                         if (backend->can_set_systemic_midi_latencies()) {
2134                                 backend->set_systemic_midi_input_latency ((*p)->name, (*p)->input_latency);
2135                                 backend->set_systemic_midi_output_latency ((*p)->name, (*p)->output_latency);
2136                         }
2137                 }
2138         }
2139
2140         if (start || (was_running && restart_required)) {
2141                 if (ARDOUR_UI::instance()->reconnect_to_engine()) {
2142                         return -1;
2143                 }
2144         }
2145
2146         post_push ();
2147
2148         return 0;
2149 }
2150
2151 void
2152 EngineControl::post_push ()
2153 {
2154         /* get a pointer to the current state object, creating one if
2155          * necessary
2156          */
2157
2158         State state = get_saved_state_for_currently_displayed_backend_and_device ();
2159
2160         if (!state) {
2161                 state = save_state ();
2162                 assert (state);
2163         } else {
2164                 store_state(state);
2165         }
2166
2167         /* all off */
2168
2169         for (StateList::iterator i = states.begin(); i != states.end(); ++i) {
2170                 (*i)->active = false;
2171         }
2172
2173         /* mark this one active (to be used next time the dialog is
2174          * shown)
2175          */
2176
2177         state->active = true;
2178
2179         if (_have_control) { // XXX
2180                 manage_control_app_sensitivity ();
2181         }
2182
2183         /* schedule a redisplay of MIDI ports */
2184         //Glib::signal_timeout().connect (sigc::bind_return (sigc::mem_fun (*this, &EngineControl::refresh_midi_display), false), 1000);
2185 }
2186
2187
2188 float
2189 EngineControl::get_rate () const
2190 {
2191         float r = atof (sample_rate_combo.get_active_text ());
2192         /* the string may have been translated with an abbreviation for
2193          * thousands, so use a crude heuristic to fix this.
2194          */
2195         if (r < 1000.0) {
2196                 r *= 1000.0;
2197         }
2198         return r;
2199 }
2200
2201
2202 uint32_t
2203 EngineControl::get_buffer_size () const
2204 {
2205         string txt = buffer_size_combo.get_active_text ();
2206         uint32_t samples;
2207
2208         if (sscanf (txt.c_str(), "%d", &samples) != 1) {
2209                 fprintf(stderr, "Find a trout and repeatedly slap the nearest C++ who throws exceptions without catching them.\n");
2210                 fprintf(stderr, "Ardour will likely crash now, giving you time to get the trout.\n");
2211                 throw exception ();
2212         }
2213
2214         return samples;
2215 }
2216
2217 string
2218 EngineControl::get_midi_option () const
2219 {
2220         return midi_option_combo.get_active_text();
2221 }
2222
2223 uint32_t
2224 EngineControl::get_input_channels() const
2225 {
2226         if (ARDOUR::Profile->get_mixbus()) {
2227                 boost::shared_ptr<ARDOUR::AudioBackend> backend = ARDOUR::AudioEngine::instance()->current_backend();
2228                 if (!backend) return 0;
2229                 return backend->input_channels();
2230         }
2231         return (uint32_t) input_channels_adjustment.get_value();
2232 }
2233
2234 uint32_t
2235 EngineControl::get_output_channels() const
2236 {
2237         if (ARDOUR::Profile->get_mixbus()) {
2238                 boost::shared_ptr<ARDOUR::AudioBackend> backend = ARDOUR::AudioEngine::instance()->current_backend();
2239                 if (!backend) return 0;
2240                 return backend->input_channels();
2241         }
2242         return (uint32_t) output_channels_adjustment.get_value();
2243 }
2244
2245 uint32_t
2246 EngineControl::get_input_latency() const
2247 {
2248         return (uint32_t) input_latency_adjustment.get_value();
2249 }
2250
2251 uint32_t
2252 EngineControl::get_output_latency() const
2253 {
2254         return (uint32_t) output_latency_adjustment.get_value();
2255 }
2256
2257 string
2258 EngineControl::get_backend () const
2259 {
2260         return backend_combo.get_active_text ();
2261 }
2262
2263 string
2264 EngineControl::get_driver () const
2265 {
2266         if (driver_combo.get_sensitive() && driver_combo.get_parent()) {
2267                 return driver_combo.get_active_text ();
2268         } else {
2269                 return "";
2270         }
2271 }
2272
2273 string
2274 EngineControl::get_device_name () const
2275 {
2276         return device_combo.get_active_text ();
2277 }
2278
2279 string
2280 EngineControl::get_input_device_name () const
2281 {
2282         return input_device_combo.get_active_text ();
2283 }
2284
2285 string
2286 EngineControl::get_output_device_name () const
2287 {
2288         return output_device_combo.get_active_text ();
2289 }
2290
2291 void
2292 EngineControl::control_app_button_clicked ()
2293 {
2294         boost::shared_ptr<ARDOUR::AudioBackend> backend = ARDOUR::AudioEngine::instance()->current_backend();
2295
2296         if (!backend) {
2297                 return;
2298         }
2299
2300         backend->launch_control_app ();
2301 }
2302
2303 void
2304 EngineControl::manage_control_app_sensitivity ()
2305 {
2306         boost::shared_ptr<ARDOUR::AudioBackend> backend = ARDOUR::AudioEngine::instance()->current_backend();
2307
2308         if (!backend) {
2309                 return;
2310         }
2311
2312         string appname = backend->control_app_name();
2313
2314         if (appname.empty()) {
2315                 control_app_button.set_sensitive (false);
2316         } else {
2317                 control_app_button.set_sensitive (true);
2318         }
2319 }
2320
2321 void
2322 EngineControl::set_desired_sample_rate (uint32_t sr)
2323 {
2324         _desired_sample_rate = sr;
2325         device_changed ();
2326 }
2327
2328 void
2329 EngineControl::on_switch_page (GtkNotebookPage*, guint page_num)
2330 {
2331         if (page_num == 0) {
2332                 cancel_button->set_sensitive (true);
2333                 ok_button->set_sensitive (true);
2334                 apply_button->set_sensitive (true);
2335                 _measure_midi.reset();
2336         } else {
2337                 cancel_button->set_sensitive (false);
2338                 ok_button->set_sensitive (false);
2339                 apply_button->set_sensitive (false);
2340         }
2341
2342         if (page_num == midi_tab) {
2343                 /* MIDI tab */
2344                 refresh_midi_display ();
2345         }
2346
2347         if (page_num == latency_tab) {
2348                 /* latency tab */
2349
2350                 if (ARDOUR::AudioEngine::instance()->running()) {
2351                         // TODO - mark as 'stopped for latency
2352                         ARDOUR_UI::instance()->disconnect_from_engine ();
2353                 }
2354
2355                 {
2356                         PBD::Unwinder<uint32_t> protect_ignore_changes (ignore_changes, ignore_changes + 1);
2357
2358                         /* save any existing latency values */
2359
2360                         uint32_t il = (uint32_t) input_latency.get_value ();
2361                         uint32_t ol = (uint32_t) input_latency.get_value ();
2362
2363                         /* reset to zero so that our new test instance
2364                            will be clean of any existing latency measures.
2365
2366                            NB. this should really be done by the backend
2367                            when stated for latency measurement.
2368                         */
2369
2370                         input_latency.set_value (0);
2371                         output_latency.set_value (0);
2372
2373                         push_state_to_backend (false);
2374
2375                         /* reset control */
2376
2377                         input_latency.set_value (il);
2378                         output_latency.set_value (ol);
2379
2380                 }
2381                 // This should be done in push_state_to_backend()
2382                 if (ARDOUR::AudioEngine::instance()->prepare_for_latency_measurement()) {
2383                         disable_latency_tab ();
2384                 }
2385
2386                 enable_latency_tab ();
2387
2388         } else {
2389                 if (lm_running) {
2390                         end_latency_detection ();
2391                         ARDOUR::AudioEngine::instance()->stop_latency_detection();
2392                 }
2393         }
2394 }
2395
2396 /* latency measurement */
2397
2398 bool
2399 EngineControl::check_audio_latency_measurement ()
2400 {
2401         MTDM* mtdm = ARDOUR::AudioEngine::instance()->mtdm ();
2402
2403         if (mtdm->resolve () < 0) {
2404                 lm_results.set_markup (string_compose (results_markup, _("No signal detected ")));
2405                 return true;
2406         }
2407
2408         if (mtdm->err () > 0.3) {
2409                 mtdm->invert ();
2410                 mtdm->resolve ();
2411         }
2412
2413         char buf[256];
2414         ARDOUR::framecnt_t const sample_rate = ARDOUR::AudioEngine::instance()->sample_rate();
2415
2416         if (sample_rate == 0) {
2417                 lm_results.set_markup (string_compose (results_markup, _("Disconnected from audio engine")));
2418                 ARDOUR::AudioEngine::instance()->stop_latency_detection ();
2419                 return false;
2420         }
2421
2422         int frames_total = mtdm->del();
2423         int extra = frames_total - ARDOUR::AudioEngine::instance()->latency_signal_delay();
2424
2425         snprintf (buf, sizeof (buf), "%s%d samples (%.3lf ms)\n%s%d samples (%.3lf ms)",
2426                         _("Detected roundtrip latency: "),
2427                         frames_total, frames_total * 1000.0f/sample_rate,
2428                         _("Systemic latency: "),
2429                         extra, extra * 1000.0f/sample_rate);
2430
2431         bool solid = true;
2432
2433         if (mtdm->err () > 0.2) {
2434                 strcat (buf, " ");
2435                 strcat (buf, _("(signal detection error)"));
2436                 solid = false;
2437         }
2438
2439         if (mtdm->inv ()) {
2440                 strcat (buf, " ");
2441                 strcat (buf, _("(inverted - bad wiring)"));
2442                 solid = false;
2443         }
2444
2445         lm_results.set_markup (string_compose (results_markup, buf));
2446
2447         if (solid) {
2448                 have_lm_results = true;
2449                 end_latency_detection ();
2450                 lm_use_button.set_sensitive (true);
2451                 return false;
2452         }
2453
2454         return true;
2455 }
2456
2457 bool
2458 EngineControl::check_midi_latency_measurement ()
2459 {
2460         ARDOUR::MIDIDM* mididm = ARDOUR::AudioEngine::instance()->mididm ();
2461
2462         if (!mididm->have_signal () || mididm->latency () == 0) {
2463                 lm_results.set_markup (string_compose (results_markup, _("No signal detected ")));
2464                 return true;
2465         }
2466
2467         char buf[256];
2468         ARDOUR::framecnt_t const sample_rate = ARDOUR::AudioEngine::instance()->sample_rate();
2469
2470         if (sample_rate == 0) {
2471                 lm_results.set_markup (string_compose (results_markup, _("Disconnected from audio engine")));
2472                 ARDOUR::AudioEngine::instance()->stop_latency_detection ();
2473                 return false;
2474         }
2475
2476         ARDOUR::framecnt_t frames_total = mididm->latency();
2477         ARDOUR::framecnt_t extra = frames_total - ARDOUR::AudioEngine::instance()->latency_signal_delay();
2478         snprintf (buf, sizeof (buf), "%s%" PRId64" samples (%.1lf ms) dev: %.2f[spl]\n%s%" PRId64" samples (%.1lf ms)",
2479                         _("Detected roundtrip latency: "),
2480                         frames_total, frames_total * 1000.0f / sample_rate, mididm->deviation (),
2481                         _("Systemic latency: "),
2482                         extra, extra * 1000.0f / sample_rate);
2483
2484         bool solid = true;
2485
2486         if (!mididm->ok ()) {
2487                 strcat (buf, " ");
2488                 strcat (buf, _("(averaging)"));
2489                 solid = false;
2490         }
2491
2492         if (mididm->deviation () > 50.0) {
2493                 strcat (buf, " ");
2494                 strcat (buf, _("(too large jitter)"));
2495                 solid = false;
2496         } else if (mididm->deviation () > 10.0) {
2497                 strcat (buf, " ");
2498                 strcat (buf, _("(large jitter)"));
2499         }
2500
2501         if (solid) {
2502                 have_lm_results = true;
2503                 end_latency_detection ();
2504                 lm_use_button.set_sensitive (true);
2505                 lm_results.set_markup (string_compose (results_markup, buf));
2506                 return false;
2507         } else if (mididm->processed () > 400) {
2508                 have_lm_results = false;
2509                 end_latency_detection ();
2510                 lm_results.set_markup (string_compose (results_markup, _("Timeout - large MIDI jitter.")));
2511                 return false;
2512         }
2513
2514         lm_results.set_markup (string_compose (results_markup, buf));
2515
2516         return true;
2517 }
2518
2519 void
2520 EngineControl::start_latency_detection ()
2521 {
2522         ARDOUR::AudioEngine::instance()->set_latency_input_port (lm_input_channel_combo.get_active_text());
2523         ARDOUR::AudioEngine::instance()->set_latency_output_port (lm_output_channel_combo.get_active_text());
2524
2525         if (ARDOUR::AudioEngine::instance()->start_latency_detection (_measure_midi ? true : false) == 0) {
2526                 lm_results.set_markup (string_compose (results_markup, _("Detecting ...")));
2527                 if (_measure_midi) {
2528                         latency_timeout = Glib::signal_timeout().connect (mem_fun (*this, &EngineControl::check_midi_latency_measurement), 100);
2529                 } else {
2530                         latency_timeout = Glib::signal_timeout().connect (mem_fun (*this, &EngineControl::check_audio_latency_measurement), 100);
2531                 }
2532                 lm_measure_label.set_text (_("Cancel"));
2533                 have_lm_results = false;
2534                 lm_use_button.set_sensitive (false);
2535                 lm_input_channel_combo.set_sensitive (false);
2536                 lm_output_channel_combo.set_sensitive (false);
2537                 lm_running = true;
2538         }
2539 }
2540
2541 void
2542 EngineControl::end_latency_detection ()
2543 {
2544         latency_timeout.disconnect ();
2545         ARDOUR::AudioEngine::instance()->stop_latency_detection ();
2546         lm_measure_label.set_text (_("Measure"));
2547         if (!have_lm_results) {
2548                 lm_use_button.set_sensitive (false);
2549         }
2550         lm_input_channel_combo.set_sensitive (true);
2551         lm_output_channel_combo.set_sensitive (true);
2552         lm_running = false;
2553 }
2554
2555 void
2556 EngineControl::latency_button_clicked ()
2557 {
2558         if (!lm_running) {
2559                 start_latency_detection ();
2560         } else {
2561                 end_latency_detection ();
2562         }
2563 }
2564
2565 void
2566 EngineControl::use_latency_button_clicked ()
2567 {
2568         if (_measure_midi) {
2569                 ARDOUR::MIDIDM* mididm = ARDOUR::AudioEngine::instance()->mididm ();
2570                 if (!mididm) {
2571                         return;
2572                 }
2573                 ARDOUR::framecnt_t frames_total = mididm->latency();
2574                 ARDOUR::framecnt_t extra = frames_total - ARDOUR::AudioEngine::instance()->latency_signal_delay();
2575                 uint32_t one_way = max ((ARDOUR::framecnt_t) 0, extra / 2);
2576                 _measure_midi->input_latency = one_way;
2577                 _measure_midi->output_latency = one_way;
2578                 notebook.set_current_page (midi_tab);
2579         } else {
2580                 MTDM* mtdm = ARDOUR::AudioEngine::instance()->mtdm ();
2581
2582                 if (!mtdm) {
2583                         return;
2584                 }
2585
2586                 double one_way = rint ((mtdm->del() - ARDOUR::AudioEngine::instance()->latency_signal_delay()) / 2.0);
2587                 one_way = std::max (0., one_way);
2588
2589                 input_latency_adjustment.set_value (one_way);
2590                 output_latency_adjustment.set_value (one_way);
2591
2592                 /* back to settings page */
2593                 notebook.set_current_page (0);
2594 }
2595         }
2596
2597
2598 bool
2599 EngineControl::on_delete_event (GdkEventAny* ev)
2600 {
2601         if (notebook.get_current_page() == 2) {
2602                 /* currently on latency tab - be sure to clean up */
2603                 end_latency_detection ();
2604         }
2605         return ArdourDialog::on_delete_event (ev);
2606 }
2607
2608 void
2609 EngineControl::engine_running ()
2610 {
2611         boost::shared_ptr<ARDOUR::AudioBackend> backend = ARDOUR::AudioEngine::instance()->current_backend();
2612         assert (backend);
2613
2614         set_active_text_if_present (buffer_size_combo, bufsize_as_string (backend->buffer_size()));
2615         sample_rate_combo.set_active_text (rate_as_string (backend->sample_rate()));
2616
2617         buffer_size_combo.set_sensitive (true);
2618         sample_rate_combo.set_sensitive (true);
2619
2620         connect_disconnect_button.set_label (string_compose (_("Disconnect from %1"), backend->name()));
2621         connect_disconnect_button.show();
2622
2623         started_at_least_once = true;
2624         engine_status.set_markup(string_compose ("<span foreground=\"green\">%1</span>", _("Active")));
2625 }
2626
2627 void
2628 EngineControl::engine_stopped ()
2629 {
2630         boost::shared_ptr<ARDOUR::AudioBackend> backend = ARDOUR::AudioEngine::instance()->current_backend();
2631         assert (backend);
2632
2633         buffer_size_combo.set_sensitive (false);
2634         connect_disconnect_button.set_label (string_compose (_("Connect to %1"), backend->name()));
2635         connect_disconnect_button.show();
2636
2637         sample_rate_combo.set_sensitive (true);
2638         buffer_size_combo.set_sensitive (true);
2639         engine_status.set_markup(string_compose ("<span foreground=\"red\">%1</span>", _("Inactive")));
2640 }
2641
2642 void
2643 EngineControl::device_list_changed ()
2644 {
2645         PBD::Unwinder<uint32_t> protect_ignore_changes (ignore_changes, ignore_changes + 1); // ??
2646         list_devices ();
2647         midi_option_changed();
2648 }
2649
2650 void
2651 EngineControl::connect_disconnect_click()
2652 {
2653         if (ARDOUR::AudioEngine::instance()->running()) {
2654                 ARDOUR_UI::instance()->disconnect_from_engine ();
2655         } else {
2656                 ARDOUR_UI::instance()->reconnect_to_engine ();
2657         }
2658 }
2659
2660 void
2661 EngineControl::calibrate_audio_latency ()
2662 {
2663         _measure_midi.reset ();
2664         have_lm_results = false;
2665         lm_use_button.set_sensitive (false);
2666         lm_results.set_markup (string_compose (results_markup, _("No measurement results yet")));
2667         notebook.set_current_page (latency_tab);
2668 }
2669
2670 void
2671 EngineControl::calibrate_midi_latency (MidiDeviceSettings s)
2672 {
2673         _measure_midi = s;
2674         have_lm_results = false;
2675         lm_use_button.set_sensitive (false);
2676         lm_results.set_markup (string_compose (results_markup, _("No measurement results yet")));
2677         notebook.set_current_page (latency_tab);
2678 }
2679
2680 void
2681 EngineControl::configure_midi_devices ()
2682 {
2683         notebook.set_current_page (midi_tab);
2684 }