somewhat working

compile_commands.json

@@ -4,5 +4,11 @@
     "command": "c++ -Iflowy.p -I. -I.. -I/usr/include/sigc++-3.0 -I/usr/lib/x86_64-linux-gnu/sigc++-3.0/include -I/usr/include/gtk-4.0/unix-print -I/usr/include/gtk-4.0 -I/usr/include/gio-unix-2.0 -I/usr/include/cairo -I/usr/include/pango-1.0 -I/usr/include/harfbuzz -I/usr/include/fribidi -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/x86_64-linux-gnu -I/usr/include/pixman-1 -I/usr/include/uuid -I/usr/include/freetype2 -I/usr/include/libpng16 -I/usr/include/graphene-1.0 -I/usr/lib/x86_64-linux-gnu/graphene-1.0/include -I/usr/include/libmount -I/usr/include/blkid -I/usr/include/glib-2.0 -I/usr/lib/x86_64-linux-gnu/glib-2.0/include -I/usr/include/gtkmm-4.0 -I/usr/lib/gtkmm-4.0/include -I/usr/include/pangomm-2.48 -I/usr/lib/pangomm-2.48/include -I/usr/include/giomm-2.68 -I/usr/lib/giomm-2.68/include -I/usr/include/glibmm-2.68 -I/usr/lib/glibmm-2.68/include -I/usr/include/cairomm-1.16 -I/usr/lib/cairomm-1.16/include -I/usr/include/gstreamer-1.0 -fdiagnostics-color=always -D_FILE_OFFSET_BITS=64 -Wall -Winvalid-pch -Wnon-virtual-dtor -g -pthread -mfpmath=sse -msse -msse2 -MD -MQ flowy.p/src_main.cpp.o -MF flowy.p/src_main.cpp.o.d -o flowy.p/src_main.cpp.o -c ../src/main.cpp",
     "file": "../src/main.cpp",
     "output": "flowy.p/src_main.cpp.o"
+  },
+  {
+    "directory": "/home/talksik/Code/flowy/client/build",
+    "command": "c++ -Iflowy.p -I. -I.. -I/usr/include/sigc++-3.0 -I/usr/lib/x86_64-linux-gnu/sigc++-3.0/include -I/usr/include/gtk-4.0/unix-print -I/usr/include/gtk-4.0 -I/usr/include/gio-unix-2.0 -I/usr/include/cairo -I/usr/include/pango-1.0 -I/usr/include/harfbuzz -I/usr/include/fribidi -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/x86_64-linux-gnu -I/usr/include/pixman-1 -I/usr/include/uuid -I/usr/include/freetype2 -I/usr/include/libpng16 -I/usr/include/graphene-1.0 -I/usr/lib/x86_64-linux-gnu/graphene-1.0/include -I/usr/include/libmount -I/usr/include/blkid -I/usr/include/glib-2.0 -I/usr/lib/x86_64-linux-gnu/glib-2.0/include -I/usr/include/gtkmm-4.0 -I/usr/lib/gtkmm-4.0/include -I/usr/include/pangomm-2.48 -I/usr/lib/pangomm-2.48/include -I/usr/include/giomm-2.68 -I/usr/lib/giomm-2.68/include -I/usr/include/glibmm-2.68 -I/usr/lib/glibmm-2.68/include -I/usr/include/cairomm-1.16 -I/usr/lib/cairomm-1.16/include -I/usr/include/gstreamer-1.0 -fdiagnostics-color=always -D_FILE_OFFSET_BITS=64 -Wall -Winvalid-pch -Wnon-virtual-dtor -g -pthread -mfpmath=sse -msse -msse2 -MD -MQ flowy.p/src_local_capture.cpp.o -MF flowy.p/src_local_capture.cpp.o.d -o flowy.p/src_local_capture.cpp.o -c ../src/local_capture.cpp",
+    "file": "../src/local_capture.cpp",
+    "output": "flowy.p/src_local_capture.cpp.o"
   }
 ]

meson.build

@@ -4,7 +4,10 @@ gtkmm_dep = dependency('gtkmm-4.0', version: '>= 4.6.0')
 gstreamer_dep = dependency('gstreamer-1.0')
 
 exe_file = executable('flowy',
+  sources: [
     'src/main.cpp',
+    'src/local_capture.cpp'
+  ],
   dependencies: [gtkmm_dep, gstreamer_dep],
   win_subsystem: 'windows',
 )

src/local_capture.cpp

@@ -0,0 +1,79 @@
+
+#include "local_capture.h"
+#include "gst/gstbus.h"
+#include "gst/gstelement.h"
+#include "gst/gstelementfactory.h"
+#include <iostream>
+
+LocalCapture::LocalCapture() {
+  std::cout << "initializing local capture" << std::endl;
+
+  GstElement *video = gst_element_factory_make("v4l2src", "video");
+  GstElement *videoconvert =
+      gst_element_factory_make("videoconvert", "videoconvert");
+  gtksink = gst_element_factory_make("autovideosink", "sink");
+
+  if (!video || !videoconvert || !gtksink) {
+    std::cerr << "failed to create elements" << std::endl;
+    return;
+  }
+
+  m_pipeline = gst_pipeline_new("local_capture");
+
+  gst_bin_add_many(GST_BIN(m_pipeline), video, videoconvert, gtksink, nullptr);
+  if (!gst_element_link_many(video, videoconvert, gtksink, nullptr)) {
+    g_printerr("Elements could not be linked.\n");
+  }
+
+  /* Start playing */
+  gst_element_set_state(m_pipeline, GST_STATE_PAUSED);
+
+  m_bus = gst_element_get_bus(m_pipeline);
+  gst_bus_add_watch(
+      m_bus,
+      [](GstBus *bus, GstMessage *msg, gpointer data) {
+        std::cout << "message type: " << GST_MESSAGE_TYPE(msg) << std::endl;
+
+        switch (GST_MESSAGE_TYPE(msg)) {
+        case GST_MESSAGE_ERROR: {
+          GError *err;
+          gchar *debug;
+          gst_message_parse_error(msg, &err, &debug);
+          g_printerr("Error: %s\n", err->message);
+          g_error_free(err);
+          g_free(debug);
+          break;
+        }
+        case GST_MESSAGE_EOS:
+          g_print("End of stream\n");
+          break;
+        default:
+          break;
+        }
+
+        return (int)G_SOURCE_CONTINUE;
+      },
+      nullptr);
+
+  std::cout << "local capture ready" << std::endl;
+}
+
+void LocalCapture::start() {
+  if (m_isRunning) {
+    return;
+  }
+
+  std::cout << "starting local capture" << std::endl;
+  m_isRunning = true;
+  gst_element_set_state(m_pipeline, GST_STATE_PLAYING);
+}
+
+void LocalCapture::pause() {
+  if (!m_isRunning) {
+    return;
+  }
+
+  std::cout << "pausing local capture" << std::endl;
+  m_isRunning = false;
+  gst_element_set_state(m_pipeline, GST_STATE_PAUSED);
+}

src/local_capture.h

@@ -0,0 +1,23 @@
+#pragma once
+
+#include <gst/gst.h>
+
+class LocalCapture {
+public:
+  LocalCapture();
+  void start();
+  void pause();
+  ~LocalCapture() {
+    gst_object_unref(m_bus);
+    gst_element_set_state(m_pipeline, GST_STATE_NULL);
+    gst_object_unref(m_pipeline);
+  }
+  bool isRunning() const { return m_isRunning; }
+  GstElement *gtksink;
+
+private:
+  bool m_isRunning;
+  gboolean bus_watch(GMainLoop *loop);
+  GstElement *m_pipeline;
+  GstBus *m_bus;
+};

src/main.cpp

@@ -1,62 +1,47 @@
 #include "gtkmm/button.h"
+#include <glib.h>
 #include <gst/gst.h>
 #include <gtkmm.h>
 #include <iostream>
 
+#include "gtkmm/widget.h"
+#include "local_capture.h"
+
 #include "main.h"
 
-void test_gstreamer() {
-  GstElement *pipeline = nullptr;
-  GstBus *bus = nullptr;
-  GstMessage *msg = nullptr;
-
-  // building pipeline
-  pipeline =
-      gst_parse_launch("playbin "
-                       "uri=https://www.freedesktop.org/software/gstreamer-sdk/"
-                       "data/media/sintel_trailer-480p.webm",
-                       nullptr);
-
-  // start playing
-  gst_element_set_state(pipeline, GST_STATE_PLAYING);
-
-  // wait until error or EOS ( End Of Stream )
-  bus = gst_element_get_bus(pipeline);
-  msg = gst_bus_timed_pop_filtered(
-      bus, GST_CLOCK_TIME_NONE,
-      static_cast<GstMessageType>(GST_MESSAGE_ERROR | GST_MESSAGE_EOS));
-
-  // free memory
-  if (msg != nullptr)
-    gst_message_unref(msg);
-  gst_object_unref(bus);
-  gst_element_set_state(pipeline, GST_STATE_NULL);
-  gst_object_unref(pipeline);
-}
-
 MyWindow::MyWindow() {
+  set_title("flowy");
 
-  set_title("Basic application");
+  m_localCapture = new LocalCapture();
+
+  //GtkWidget *area;
+  // g_object_get(m_localCapture->gtksink, "widget", &area, NULL);
+  // Gtk::Widget *widget = Glib::wrap(area);
+  // set_child(*widget);
 
   Gtk::Button button("start capture");
-
   button.signal_clicked().connect(
-      sigc::mem_fun(*this, &MyWindow::startCapture));
-
+      sigc::mem_fun(*this, &MyWindow::toggleCapture));
   set_default_size(800, 450);
-
   set_child(button);
 }
 
 MyWindow::~MyWindow() {}
 
-void MyWindow::startCapture() { std::cout << "start capture" << std::endl; }
+void MyWindow::toggleCapture() {
+  if (m_localCapture->isRunning()) {
+    m_localCapture->pause();
+    button.set_label("start capture");
+  } else {
+    m_localCapture->start();
+    button.set_label("stop capture");
+  }
+}
 
 int main(int argc, char **argv) {
   gst_init(&argc, &argv);
-  test_gstreamer();
 
-  auto app = Gtk::Application::create("org.gtkmm.examples.base");
+  auto app = Gtk::Application::create("live.flowy.client");
 
   return app->make_window_and_run<MyWindow>(argc, argv);
 }

src/main.h

@@ -1,3 +1,6 @@
+#pragma once
+
+#include "local_capture.h"
 #include <gtkmm.h>
 
 class MyWindow : public Gtk::Window {
@@ -7,5 +10,8 @@ public:
 
 public:
   Gtk::Button button;
-  void startCapture();
+  void toggleCapture();
+
+private:
+  LocalCapture *m_localCapture;
 };