Readd feature to make QtXMultimedia optional again

In order to be able to defer solving all Qt6 API differences at once
I tried to reactivate the QT_MULTIMEDIA_LIB feature. I managed to fix
most problems but one problem remains in both Qt5 and Qt6 builds.
Without Qt[56]Multimedia, the following error exceeds my non-existing
C++ knowledge:

jmayer/work/wireshark/git/ui/qt/rtp_player_dialog.cpp:154:18: error: out-of-line definition of 'RtpPlayerDialog' does not match any declaration in 'RtpPlayerDialog'
RtpPlayerDialog::RtpPlayerDialog(QWidget &parent, CaptureFile &cf, bool capture_running) :
                 ^~~~~~~~~~~~~~~

CMakeLists.txt

@@ -1251,7 +1251,8 @@ if(BUILD_wireshark)
 		Qt${qtver}Core
 		Qt${qtver}Gui
 		Qt${qtver}LinguistTools
-		Qt${qtver}Multimedia
+		# Our code currently does not compile with Qt6Multimedia
+		# Qt${qtver}Multimedia
 		Qt${qtver}PrintSupport
 		Qt${qtver}Widgets
 	)
@@ -1268,6 +1269,7 @@ if(BUILD_wireshark)
 			set(MIN_MACOS_VERSION 10.14)
 		endif()
 	else()
+		list(APPEND QT_PACKAGELIST Qt5Multimedia)
 		if(WIN32)
 			list(APPEND QT_PACKAGELIST Qt5WinExtras)
 		endif()
@@ -1291,6 +1293,9 @@ if(BUILD_wireshark)
 	if(APPLE)
 		ws_find_package(Sparkle ENABLE_SPARKLE HAVE_SOFTWARE_UPDATE)
 	endif()
+	if(Qt${qtver}Multimedia_FOUND)
+		set(QT_MULTIMEDIA_LIB 1)
+	endif()
 endif()
 
 # MaxMind DB address resolution

cmakeconfig.h.in

@@ -281,7 +281,7 @@
 #cmakedefine HAVE_UNISTD_H 1
 
 /* Define if we have QtMultimedia */
-#define QT_MULTIMEDIA_LIB 1
+#cmakedefine QT_MULTIMEDIA_LIB 1
 
 /* Build androiddump with libpcap instead of wireshark stuff */
 #cmakedefine ANDROIDDUMP_USE_LIBPCAP 1

ui/qt/main_window_slots.cpp

@@ -3576,8 +3576,10 @@ void MainWindow::on_actionTelephonyRtpPlayer_triggered()
         QMessageBox::warning(this, tr("RTP packet search failed"),
                              err,
                              QMessageBox::Ok);
+#ifdef QT_MULTIMEDIA_LIB
     } else {
         openTelephonyRtpPlayerDialog()->addRtpStreams(stream_ids);
+#endif // QT_MULTIMEDIA_LIB
     }
     foreach(rtpstream_id_t *id, stream_ids) {
         rtpstream_id_free(id);
@@ -4165,6 +4167,7 @@ void MainWindow::activatePluginIFToolbar(bool)
     }
 }
 
+#ifdef QT_MULTIMEDIA_LIB
 void MainWindow::rtpPlayerDialogReplaceRtpStreams(QVector<rtpstream_id_t *> stream_ids)
 {
     openTelephonyRtpPlayerDialog()->replaceRtpStreams(stream_ids);
@@ -4179,6 +4182,7 @@ void MainWindow::rtpPlayerDialogRemoveRtpStreams(QVector<rtpstream_id_t *> strea
 {
     openTelephonyRtpPlayerDialog()->removeRtpStreams(stream_ids);
 }
+#endif // QT_MULTIMEDIA_LIB
 
 void MainWindow::rtpAnalysisDialogReplaceRtpStreams(QVector<rtpstream_id_t *> stream_ids)
 {

ui/qt/rtp_player_dialog.cpp

@@ -134,6 +134,7 @@ public:
 };
 
 
+#ifdef QT_MULTIMEDIA_LIB
 RtpPlayerDialog *RtpPlayerDialog::pinstance_{nullptr};
 std::mutex RtpPlayerDialog::mutex_;
 
@@ -148,6 +149,7 @@ RtpPlayerDialog *RtpPlayerDialog::openRtpPlayerDialog(QWidget &parent, CaptureFi
     }
     return pinstance_;
 }
+#endif // QT_MULTIMEDIA_LIB
 
 RtpPlayerDialog::RtpPlayerDialog(QWidget &parent, CaptureFile &cf, bool capture_running) :
     WiresharkDialog(parent, cf)
@@ -158,7 +160,6 @@ RtpPlayerDialog::RtpPlayerDialog(QWidget &parent, CaptureFile &cf, bool capture_
     , first_stream_rel_stop_time_(0.0)
     , streams_length_(0.0)
     , start_marker_time_(0.0)
-#endif // QT_MULTIMEDIA_LIB
     , number_ticker_(new QCPAxisTicker)
     , datetime_ticker_(new QCPAxisTickerDateTime)
     , stereo_available_(false)
@@ -170,6 +171,7 @@ RtpPlayerDialog::RtpPlayerDialog(QWidget &parent, CaptureFile &cf, bool capture_
     , lock_ui_(0)
     , read_capture_enabled_(capture_running)
     , silence_skipped_time_(0.0)
+#endif // QT_MULTIMEDIA_LIB
 {
     ui->setupUi(this);
     loadGeometry(parent.width(), parent.height());

ui/qt/rtp_player_dialog.h

@@ -26,7 +26,10 @@
 #include <QTreeWidgetItem>
 #include <QMetaType>
 #include <ui/qt/widgets/qcustomplot.h>
+
+#ifdef QT_MULTIMEDIA_LIB
 #include <QAudioDeviceInfo>
+#endif
 
 namespace Ui {
 class RtpPlayerDialog;