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                 QMessageBox::critical
  51                   ( 0, QString(PACKAGE_NAME " error"),
  52                     QString("Cannot initialise jackspa"), QMessageBox::Ok );
  53                 return 1;
  54         }
  55
  56         try
  57         {
  58
  59         /* Main layout */
  60         window.setWidget(new QWidget);
  61         QVBoxLayout *slider_box = new QVBoxLayout(window.widget());
  62
  63         /* Title bar */
  64         QPushButton *button;
  65         QPushButton *toggle;
  66         {
  67                 QGridLayout *title = 0;
  68                 slider_box->addLayout(title = new QGridLayout);
  69                 title->addWidget(button = new QPushButton("&Def"), 0, 0);
  70                 title->addWidget(toggle = new QPushButton("&Xch"), 1, 0);
  71                 QLabel *label = 0;
  72                 title->addWidget(label = new QLabel(state.descriptor->Name), 0, 1, 2, 1);
  73
  74                 button->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Fixed);
  75                 toggle->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Fixed);
  76                 label->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Fixed);
  77                 title->setHorizontalSpacing(4);
  78                 title->setVerticalSpacing(2);
  79         }
  80         /* Initialise the controls */
  81         for (unsigned long p = 0, c = 0; p < state.descriptor->PortCount; p++)
  82                 if ( LADSPA_IS_PORT_INPUT(state.descriptor->PortDescriptors[p]) &&
  83                      LADSPA_IS_PORT_CONTROL(state.descriptor->PortDescriptors[p]) )
  84                 {
  85                         ControlLayout *control = 0;
  86                         slider_box->addLayout(control = new ControlLayout(&state, p, c++));
  87                         QObject::connect( button, SIGNAL(clicked()),
  88                                           control, SLOT(on_button_pressed()) );
  89                         QObject::connect( toggle, SIGNAL(clicked()),
  90                                           control, SLOT(exchange_control()) );
  91                 }
  92
  93         /* Main layout */
  94         slider_box->setContentsMargins(1, 1, 1, 1);
  95         slider_box->setSpacing(8);
  96         window.setWidgetResizable(true);
  97         window.frameSize().setWidth(400);
  98         window.setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
  99         window.setWindowTitle
 100           ((*new QString(PROGRAM_NAME "_")).append(state.descriptor->Label));
 101         window.show();
 102
 103         }
 104         catch(std::exception const &e)
 105         {
 106                 QMessageBox::critical
 107                   ( 0, QString(PROGRAM_NAME),
 108                     QString("Exception failure while initialising the Qt interface:\n").
 109                       append(e.what()),
 110                     QMessageBox::Ok );
 111                 throw(e);
 112         }
 113
 114         return app.exec();
 115 }
 116
 117 ControlLayout::ControlLayout(state_t *state, unsigned long port,
 118                              unsigned long ctrl,  QWidget *parent) :
 119         QGridLayout(parent),
 120         button("Def"),
 121         slider(Qt::Horizontal)
 122 {
 123         control_init(&control, state, port, ctrl);
 124         label.setText(control.name);
 125         number.setCorrectionMode(QAbstractSpinBox::CorrectToNearestValue);
 126         number.setAccelerated(true);
 127         number.setDecimals(4);
 128         number.setRange( static_cast<double>(control.min),
 129                          static_cast<double>(control.max) );
 130         number.setSingleStep(static_cast<double>(control.inc.fine));
 131         slider.setTracking(false);
 132         slider.setRange(0, 5000);
 133         slider.setSingleStep
 134           (5000 / nearbyintf((control.max - control.min) / control.inc.fine));
 135         slider.setPageStep
 136           (5000 / nearbyintf((control.max - control.min) / control.inc.coarse));
 137         if (control.type == JACKSPA_INT || control.type == JACKSPA_TOGGLE) {
 138                 number.setDecimals(0);
 139                 slider.setRange(0, nearbyintf(control.max - control.min));
 140                 slider.setSingleStep(1);
 141                 slider.setPageStep(2);
 142                 slider.setTickInterval(1);
 143                 slider.setTickPosition(QSlider::TicksLeft);
 144         }
 145
 146         /* Setup the widgets' state */
 147         number.setValue(static_cast<double>(*control.val));
 148         on_number_changed();
 149
 150         /* Layout the widgets */
 151         setHorizontalSpacing(4);
 152         setVerticalSpacing(2);
 153         addWidget(&button, 0, 0);
 154         addWidget(&number, 1, 0);
 155         addWidget(&label, 0, 2);
 156         addWidget(&slider, 1, 2);
 157         button.setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Preferred);
 158         label.setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Fixed);
 159         slider.setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Fixed);
 160
 161         /* Signal connections */
 162         QObject::connect( &number, SIGNAL(valueChanged(double)),
 163                           this, SLOT(on_number_changed()) );
 164         QObject::connect( &slider, SIGNAL(valueChanged(int)),
 165                           this, SLOT(on_slider_changed()) );
 166         QObject::connect( &button, SIGNAL(clicked()),
 167                           this, SLOT(on_button_pressed()) );
 168 }
 169
 170 void ControlLayout::on_number_changed()
 171 {
 172         *control.val = static_cast<LADSPA_Data>(number.value());
 173         set_slider(static_cast<LADSPA_Data>(number.value()));
 174 }
 175
 176 void ControlLayout::on_slider_changed()
 177 {
 178         int num_pos = slider.maximum() - slider.minimum();
 179         LADSPA_Data val = control.min +
 180           static_cast<LADSPA_Data>(slider.value()) /
 181           static_cast<LADSPA_Data>(num_pos) *
 182           (control.max - control.min);
 183
 184         *control.val = val;
 185         number.setValue(static_cast<double>(val));
 186 }
 187
 188 void ControlLayout::on_button_pressed()
 189 {
 190         if (control.def) {
 191                 *control.val = *control.def;
 192                 number.setValue(static_cast<double>(*control.def));
 193                 set_slider(*control.def);
 194         }
 195 }
 196
 197 void ControlLayout::exchange_control()
 198 {
 199         control_exchange(&control);
 200         set_slider(*control.val);
 201 }
 202
 203 void ControlLayout::set_slider(LADSPA_Data val)
 204 {
 205         int num_pos = slider.maximum() - slider.minimum();
 206
 207         slider.setValue( static_cast<int>( lrintf
 208           ( ((val - control.min) * static_cast<LADSPA_Data>(num_pos)) /
 209             (control.max - control.min) ) ) );
 210           // setValue() will not emit valueChanged() if it is being set to its
 211           // current value
 212 }