qjackspa.cpp

   1 // qjackspa.cpp - simple Qt4 LADSPA host for the Jack Audio Connection Kit
   2 // Copyright © 2013 Géraud Meyer <graud@gmx.com>
   3 //
   4 // This file is part of ng-jackspa.
   5 //
   6 // ng-jackspa is free software; you can redistribute it and/or modify it under
   7 // the terms of the GNU General Public License version 2 as published by the
   8 // Free Software Foundation.
   9 //
  10 // This program is distributed in the hope that it will be useful, but WITHOUT
  11 // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12 // FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13 // more details.
  14 //
  15 // You should have received a copy of the GNU General Public License along
  16 // with ng-jackspa.  If not, see <http://www.gnu.org/licenses/>.
  17
  18 #include <iostream>
  19 #include <exception>
  20 #include "qjackspa.h"
  21
  22 #define PROGRAM_NAME "qjackspa"
  23 #include "interface.c"
  24 #define PROGRAM_DESCRIPTION_EXTRA PROGRAM_NAME " also accepts standard Qt options.\n\n"
  25
  26 int main(int argc, char *argv[])
  27 {
  28         QApplication app(argc, argv);
  29
  30         /* Command line options */
  31         GError *error = NULL;
  32         GOptionContext *context = interface_context();
  33         g_option_context_set_description( context, g_strconcat
  34           ( PROGRAM_DESCRIPTION_EXTRA,
  35             g_option_context_get_description(context), NULL ) );
  36         if (!g_option_context_parse(context, &argc, &argv, &error)) {
  37                 QMessageBox::critical
  38                   ( 0, QString(PACKAGE_NAME " error"),
  39                     QString("Option parsing failed"), QMessageBox::Ok );
  40                 std::cerr << "option parsing failed: " << error->message << std::endl;
  41                 return -1;
  42         }
  43
  44         /* Main window */
  45         QScrollArea window;
  46
  47         /* Initialise jackspa */
  48         state_t state;
  49         if (!jackspa_init(&state, argc, argv)) {
  50                 if (verbose)
  51                         QMessageBox::critical
  52                           ( 0, QString(PACKAGE_NAME " error"),
  53                             QString("Cannot initialise jackspa"), QMessageBox::Ok );
  54                 return 1;
  55         }
  56
  57         try
  58         {
  59
  60         /* Main layout */
  61         window.setWidget(new QWidget);
  62         QVBoxLayout *slider_box = new QVBoxLayout(window.widget());
  63
  64         /* Title bar */
  65         QPushButton *button;
  66         QPushButton *toggle;
  67         {
  68                 QGridLayout *title = 0;
  69                 slider_box->addLayout(title = new QGridLayout);
  70                 title->addWidget(button = new QPushButton("&Def"), 0, 0);
  71                 title->addWidget(toggle = new QPushButton("&Xch"), 1, 0);
  72                 QLabel *label = 0;
  73                 title->addWidget(label = new QLabel(state.descriptor->Name), 0, 1, 2, 1);
  74
  75                 button->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Fixed);
  76                 toggle->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Fixed);
  77                 label->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Fixed);
  78                 title->setHorizontalSpacing(4);
  79                 title->setVerticalSpacing(2);
  80         }
  81         /* Initialise the controls */
  82         for (unsigned long p = 0, c = 0; p < state.descriptor->PortCount; p++)
  83                 if ( LADSPA_IS_PORT_INPUT(state.descriptor->PortDescriptors[p]) &&
  84                      LADSPA_IS_PORT_CONTROL(state.descriptor->PortDescriptors[p]) )
  85                 {
  86                         ControlLayout *control = 0;
  87                         slider_box->addLayout(control = new ControlLayout(&state, p, c++));
  88                         QObject::connect( button, SIGNAL(clicked()),
  89                                           control, SLOT(on_button_pressed()) );
  90                         QObject::connect( toggle, SIGNAL(clicked()),
  91                                           control, SLOT(exchange_control()) );
  92                 }
  93
  94         /* Main layout */
  95         slider_box->setContentsMargins(1, 1, 1, 1);
  96         slider_box->setSpacing(8);
  97         window.setWidgetResizable(true);
  98         window.frameSize().setWidth(400);
  99         window.setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
 100         window.setWindowTitle
 101           ((*new QString(PROGRAM_NAME "_")).append(state.descriptor->Label));
 102         window.show();
 103
 104         }
 105         catch(std::exception const &e)
 106         {
 107                 QMessageBox::critical
 108                   ( 0, QString(PROGRAM_NAME),
 109                     QString("Exception failure while initialising the Qt interface:\n").
 110                       append(e.what()),
 111                     QMessageBox::Ok );
 112                 throw(e);
 113         }
 114
 115         int rc = app.exec();
 116
 117         jackspa_fini(&state);
 118         return rc;
 119 }
 120
 121 ControlLayout::ControlLayout(state_t *state, unsigned long port,
 122                              unsigned long ctrl,  QWidget *parent) :
 123         QGridLayout(parent),
 124         button("Def"),
 125         slider(Qt::Horizontal)
 126 {
 127         control_init(&control, state, port, ctrl);
 128         label.setText(control.name);
 129         number.setCorrectionMode(QAbstractSpinBox::CorrectToNearestValue);
 130         number.setAccelerated(true);
 131         number.setDecimals(4);
 132         number.setRange( static_cast<double>(control.min),
 133                          static_cast<double>(control.max) );
 134         number.setSingleStep(static_cast<double>(control.inc.fine));
 135         slider.setTracking(false);
 136         slider.setRange(0, 5000);
 137         slider.setSingleStep
 138           (5000 / nearbyintf((control.max - control.min) / control.inc.fine));
 139         slider.setPageStep
 140           (5000 / nearbyintf((control.max - control.min) / control.inc.coarse));
 141         if (control.type == JACKSPA_INT || control.type == JACKSPA_TOGGLE) {
 142                 number.setDecimals(0);
 143                 slider.setRange(0, nearbyintf(control.max - control.min));
 144                 slider.setSingleStep(1);
 145                 slider.setPageStep(2);
 146                 slider.setTickInterval(1);
 147                 slider.setTickPosition(QSlider::TicksLeft);
 148         }
 149
 150         /* Setup the widgets' state */
 151         number.setValue(static_cast<double>(*control.val));
 152         on_number_changed();
 153
 154         /* Layout the widgets */
 155         setHorizontalSpacing(4);
 156         setVerticalSpacing(2);
 157         addWidget(&button, 0, 0);
 158         addWidget(&number, 1, 0);
 159         addWidget(&label, 0, 2);
 160         addWidget(&slider, 1, 2);
 161         button.setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Preferred);
 162         label.setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Fixed);
 163         slider.setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Fixed);
 164
 165         /* Signal connections */
 166         QObject::connect( &number, SIGNAL(valueChanged(double)),
 167                           this, SLOT(on_number_changed()) );
 168         QObject::connect( &slider, SIGNAL(valueChanged(int)),
 169                           this, SLOT(on_slider_changed()) );
 170         QObject::connect( &button, SIGNAL(clicked()),
 171                           this, SLOT(on_button_pressed()) );
 172 }
 173
 174 ControlLayout::~ControlLayout()
 175 {
 176         control_fini(&control);
 177 }
 178
 179 void ControlLayout::on_number_changed()
 180 {
 181         *control.val = static_cast<LADSPA_Data>(number.value());
 182         set_slider(static_cast<LADSPA_Data>(number.value()));
 183 }
 184
 185 void ControlLayout::on_slider_changed()
 186 {
 187         int num_pos = slider.maximum() - slider.minimum();
 188         LADSPA_Data val = control.min +
 189           static_cast<LADSPA_Data>(slider.value()) /
 190           static_cast<LADSPA_Data>(num_pos) *
 191           (control.max - control.min);
 192
 193         *control.val = val;
 194         number.setValue(static_cast<double>(val));
 195 }
 196
 197 void ControlLayout::on_button_pressed()
 198 {
 199         if (control.def) {
 200                 *control.val = *control.def;
 201                 number.setValue(static_cast<double>(*control.def));
 202                 set_slider(*control.def);
 203         }
 204 }
 205
 206 void ControlLayout::exchange_control()
 207 {
 208         control_exchange(&control);
 209         set_slider(*control.val);
 210 }
 211
 212 void ControlLayout::set_slider(LADSPA_Data val)
 213 {
 214         int num_pos = slider.maximum() - slider.minimum();
 215
 216         slider.setValue( static_cast<int>( lrintf
 217           ( ((val - control.min) * static_cast<LADSPA_Data>(num_pos)) /
 218             (control.max - control.min) ) ) );
 219           // setValue() will not emit valueChanged() if it is being set to its
 220           // current value
 221 }