New visitor for ImGui display of scene

CMakeLists.txt

@@ -228,6 +228,7 @@ set(VMIX_SRCS
     RenderingManager.cpp
     UserInterfaceManager.cpp
     ImGuiToolkit.cpp
+    ImGuiVisitor.cpp
     GstToolkit.cpp
     tinyxml2Toolkit.cpp
 )

ImGuiVisitor.cpp

@@ -1,6 +1,135 @@
 #include "ImGuiVisitor.h"
 
+#include <glm/glm.hpp>
+#include <glm/gtc/type_ptr.hpp>
+#include <glm/ext/vector_float2.hpp>
+#include <glm/ext/vector_float3.hpp>
+#include <glm/ext/vector_float4.hpp>
+#include <glm/gtc/constants.hpp>
+
+#include "Log.h"
+#include "Scene.h"
+#include "Primitives.h"
+#include "ImageShader.h"
+#include "MediaPlayer.h"
+
+#include "imgui.h"
+#include "ImGuiToolkit.h"
+
 ImGuiVisitor::ImGuiVisitor()
 {
 
 }
+
+void ImGuiVisitor::visit(Node &n)
+{
+
+}
+
+void ImGuiVisitor::visit(Group &n)
+{
+    std::string id = std::to_string(n.id());
+    if (ImGui::TreeNode(id.c_str(), "Group"))
+    {
+
+        //    n.transform_
+            // MODEL VIEW
+            float translation[2] = { n.transform_[3][0], n.transform_[3][1]};
+            if (ImGuiToolkit::ButtonIcon(6, 15)) {
+                translation[0] = 0.f;
+                translation[1] = 0.f;
+            }
+            ImGui::SameLine(0, 10);
+            ImGui::SliderFloat2("position", translation, -5.0, 5.0);
+
+            float rotation = asin(n.transform_[0][1]);
+            if (ImGuiToolkit::ButtonIcon(4, 15)) rotation = 0.f;
+            ImGui::SameLine(0, 10);
+            ImGui::SliderFloat("rotation", &rotation, 0, glm::two_pi<float>());
+
+            float scale = n.transform_[2][2];
+            if (ImGuiToolkit::ButtonIcon(3, 15))  scale = 1.f;
+            ImGui::SameLine(0, 10);
+            ImGui::SliderFloat("scale", &scale, 0.1f, 10.f, "%.3f", 3.f);
+
+            glm::mat4 View = glm::translate(glm::identity<glm::mat4>(), glm::vec3(translation[0], translation[1], 0.f));
+            View = glm::rotate(View, rotation, glm::vec3(0.0f, 0.0f, 1.0f));
+            glm::mat4 Model = glm::scale(glm::identity<glm::mat4>(), glm::vec3(scale, scale, scale));
+            n.transform_ = View * Model;
+
+        // loop over members of a group
+        for (int i = 0; i < n.numChildren(); ++i)
+        {
+            n.getChild(i)->accept(*this);
+        }
+
+        ImGui::TreePop();
+    }
+}
+
+void ImGuiVisitor::visit(Switch &n)
+{
+
+}
+
+void ImGuiVisitor::visit(Primitive &n)
+{
+    ImGui::PushID(n.id());
+    ImGui::Text("Primitive");
+
+
+    n.getShader()->accept(*this);
+    ImGui::PopID();
+}
+
+void ImGuiVisitor::visit(ImageSurface &n)
+{
+
+}
+
+void ImGuiVisitor::visit(MediaSurface &n)
+{
+    ImGui::Text("%s", n.getFilename().c_str());
+    n.getMediaPlayer()->accept(*this);
+}
+
+void ImGuiVisitor::visit(MediaPlayer &n)
+{
+
+    ImGui::Text("Media Player");
+}
+
+void ImGuiVisitor::visit(Shader &n)
+{
+    ImGui::ColorEdit3("color", glm::value_ptr(n.color) ) ;
+}
+
+void ImGuiVisitor::visit(ImageShader &n)
+{
+}
+
+void ImGuiVisitor::visit(LineStrip &n)
+{
+    ImGui::Text("Lines");
+}
+
+void ImGuiVisitor::visit(LineSquare &n)
+{
+    ImGui::Text("Square");
+}
+
+void ImGuiVisitor::visit(LineCircle &n)
+{
+    ImGui::Text("Circle");
+}
+
+void ImGuiVisitor::visit(Scene &n)
+{
+    ImGui::SetNextItemOpen(true, ImGuiCond_Once);
+    if (ImGui::CollapsingHeader("Scene Property Tree"))
+    {
+        n.getRoot()->accept(*this);
+    }
+}
+
+

ImGuiVisitor.h

@@ -1,11 +1,29 @@
 #ifndef IMGUIVISITOR_H
 #define IMGUIVISITOR_H
 
+#include "Visitor.h"
 
-class ImGuiVisitor
+class ImGuiVisitor: public Visitor
 {
 public:
     ImGuiVisitor();
+
+    // Elements of Scene
+    void visit(Scene& n) override;
+    void visit(Node& n) override;
+    void visit(Group& n) override;
+    void visit(Switch& n) override;
+    void visit(Primitive& n) override;
+    void visit(ImageSurface& n) override;
+    void visit(MediaSurface& n) override;
+    void visit(LineStrip& n) override;
+    void visit(LineSquare& n) override;
+    void visit(LineCircle& n) override;
+
+    // Elements with attributes
+    void visit(MediaPlayer& n) override;
+    void visit(Shader& n) override;
+    void visit(ImageShader& n) override;
 };
 
 #endif // IMGUIVISITOR_H

Scene.cpp

@@ -14,9 +14,16 @@
 #include <glm/gtc/matrix_access.hpp>
 #include <glm/gtc/matrix_transform.hpp>
 
+#include <chrono>
+#include <ctime>
+
 // Node
-Node::Node() : parent_(nullptr), visible_(false)
+Node::Node() : parent_(nullptr), visible_(false), initialized_(false)
 {
+    // create unique id
+    auto duration = std::chrono::system_clock::now().time_since_epoch();
+    id_ = std::chrono::duration_cast<std::chrono::nanoseconds>(duration).count() % 100000000;
+
     worldToLocal_ = glm::identity<glm::mat4>();
     localToWorld_ = glm::identity<glm::mat4>();
     transform_ = glm::identity<glm::mat4>();
@@ -101,6 +108,7 @@ void Primitive::init()
     if ( arrayBuffer_ )  glDeleteBuffers ( 1, &arrayBuffer_);
     if ( elementBuffer_ ) glDeleteBuffers ( 1, &elementBuffer_);
 
+    initialized_ = true;
     visible_ = true;
 }
 
@@ -147,6 +155,7 @@ Group::~Group()
 void Group::init()
 {
     visible_ = true;
+    initialized_ = true;
 }
 
 void Group::update( float dt )

Scene.h

@@ -16,17 +16,20 @@ class Node {
 public:
     Node();
     virtual ~Node() {}    
+    inline int id() { return id_; }
 
     virtual void init() = 0;
     virtual void draw( glm::mat4 modelview,  glm::mat4 projection) = 0;
     virtual void accept(Visitor& v);
     virtual void update( float dt );
-
+    virtual bool initialized() { return initialized_; }
     virtual glm::mat4 getWorldToLocalMatrix() { return worldToLocal_; }
     virtual glm::mat4 getLocalToWorldMatrix() { return localToWorld_; }
 
     Node*     parent_;
     bool      visible_;
+    bool      initialized_;
+    int       id_;
     glm::mat4 worldToLocal_;
     glm::mat4 localToWorld_;
     glm::mat4 transform_;

main.cpp

@@ -36,127 +36,54 @@
 #include "MediaPlayer.h"
 #include "Scene.h"
 #include "Primitives.h"
+#include "ImGuiVisitor.h"
 #include "SessionVisitor.h"
 
 #define PI 3.14159265358979323846
 
+// test scene
+
+////    ("file:///home/bhbn/Videos/MOV001.MOD");
+////    ("file:///home/bhbn/Videos/TestFormats/Commodore64GameReviewMoondust.flv");
+////    ("file:///home/bhbn/Videos/fish.mp4");
+////    ("file:///home/bhbn/Videos/jean/Solitude1080p.mov");
+////    ("file:///home/bhbn/Videos/TearsOfSteel_720p_h265.mkv");
+////    ("file:///home/bhbn/Videos/TestFormats/_h264GoldenLamps.mkv");
+////    ("file:///home/bhbn/Videos/TestEncoding/vpxvp9high.webm");
+////    ("file:///home/bhbn/Videos/iss.mov");
+///
 Scene scene;
 FrameBuffer *output;
-MediaPlayer testmedia;
+MediaSurface testnode1("file:///home/bhbn/Videos/iss.mov");
-MediaPlayer testmedia2("testmedia2");
+MediaSurface testnode2("file:///home/bhbn/Videos/fish.mp4");
-ImageShader rendering_shader;
+ImageSurface testnode3("images/v-mix_256x256.png");
-unsigned int vbo, vao, ebo;
-float texturear = 1.0;
-GLuint textureimagepng = 0;
 
 
-// from https://gstreamer.freedesktop.org/documentation/application-development/advanced/pipeline-manipulation.html?gi-language=c
-
-void drawMediaBackgound()
-{
-    if ( !testmedia2.isOpen() )
-        return;
-
-    //
-    // RENDER SOURCE
-    //
-    testmedia2.update();
-
-    // use the shader
-    rendering_shader.projection = Rendering::manager().Projection();
-    rendering_shader.modelview = glm::identity<glm::mat4>();;
-    rendering_shader.use();
-    // use the media
-    testmedia2.bind();
-    // draw the vertex array
-    glBindVertexArray(vao);
-    glDrawElements(GL_TRIANGLE_STRIP, 4, GL_UNSIGNED_INT, 0);
-    glBindVertexArray(0);
-    glBindTexture(GL_TEXTURE_2D, 0);
-
-    //
-    // GUI to control SOURCE
-    //
-    {
-        ImGui::Begin("Image properties");
-
-        // MODEL VIEW
-        static float translation[] = {0.f, 0.f};
-        if (ImGuiToolkit::ButtonIcon(6, 15)) {
-            translation[0] = 0.f;
-            translation[1] = 0.f;
-        }
-        ImGui::SameLine(0, 10);
-        ImGui::SliderFloat2("position", translation, -5.0, 5.0);
-
-        static float rotation = 0.f;
-        if (ImGuiToolkit::ButtonIcon(4, 15)) rotation = 0.f;
-        ImGui::SameLine(0, 10); 
-        ImGui::SliderFloat("rotation", &rotation, 0, 2 * PI);
-
-        static float scale = 1.f;
-        if (ImGuiToolkit::ButtonIcon(3, 15))  scale = 1.f;
-        ImGui::SameLine(0, 10);
-        ImGui::SliderFloat("scale", &scale, 0.1f, 10.f, "%.3f", 3.f);
-
-        // set modelview
-//        rendering_shader.setModelview(translation[0], translation[1], rotation, scale, testmedia2.AspectRatio());
-
-        // color picker
-        if (ImGuiToolkit::ButtonIcon(16, 8))  rendering_shader.color = glm::vec4(1.f);
-        ImGui::SameLine(0, 10);
-        ImGui::ColorEdit3("color", glm::value_ptr(rendering_shader.color) ) ;
-        // brightness slider
-        if (ImGuiToolkit::ButtonIcon(4, 1)) rendering_shader.brightness = 0.f;
-        ImGui::SameLine(0, 10);
-        ImGui::SliderFloat("brightness", &rendering_shader.brightness, -1.0, 1.0, "%.3f", 2.f);
-        // contrast slider
-        if (ImGuiToolkit::ButtonIcon(2, 1)) rendering_shader.contrast = 0.f;
-        ImGui::SameLine(0, 10);
-        ImGui::SliderFloat("contrast", &rendering_shader.contrast, -1.0, 1.0, "%.3f", 2.f);
-
-        ImGui::End();
-    }
-
-}
-
 void drawMediaPlayer()
 {
     static GstClockTime begin = GST_CLOCK_TIME_NONE;
     static GstClockTime end = GST_CLOCK_TIME_NONE;
 
-    if ( !testmedia.isOpen() )
+    if ( !testnode2.getMediaPlayer() || !testnode2.getMediaPlayer()->isOpen() )
         return;
 
-    testmedia.update();
+    MediaPlayer *mp = testnode2.getMediaPlayer();
 
-    if ( begin == GST_CLOCK_TIME_NONE) {
+    ImGui::SetNextWindowPos(ImVec2(200, 200), ImGuiCond_FirstUseEver);
-
+    ImGui::SetNextWindowSize(ImVec2(300, 300), ImGuiCond_FirstUseEver);
-        begin = testmedia.duration() / 5;
+    ImGui::Begin(IMGUI_TITLE_MEDIAPLAYER);
-        end = testmedia.duration() / 3;
-//        if ( testmedia.addPlaySegment(begin, end) )
-//            std::cerr << " - first segment " << std::endl;
-
-//        begin *= 2;
-//        end *= 2;
-//        if ( testmedia.addPlaySegment(begin, end) )
-//            std::cerr << " - second segment " << std::endl;
-
-    }
-
-    ImGui::Begin("Media Player");
     float width = ImGui::GetContentRegionAvail().x;
     float spacing = ImGui::GetStyle().ItemInnerSpacing.x;
 
-    ImVec2 imagesize ( width, width / testmedia.aspectRatio());
+    ImVec2 imagesize ( width, width / mp->aspectRatio());
-    ImGui::Image((void*)(intptr_t)testmedia.texture(), imagesize);
+    ImGui::Image((void*)(intptr_t)mp->texture(), imagesize);
 
     if (ImGui::Button(ICON_FA_FAST_BACKWARD))
-        testmedia.rewind();
+        mp->rewind();
     ImGui::SameLine(0, spacing);
 
     // remember playing mode of the GUI
-    static bool media_playing_mode = testmedia.isPlaying();
+    static bool media_playing_mode = mp->isPlaying();
 
     // display buttons Play/Stop depending on current playing mode
     if (media_playing_mode) {
@@ -167,7 +94,7 @@ void drawMediaPlayer()
 
         ImGui::PushButtonRepeat(true);
          if (ImGui::Button(ICON_FA_FORWARD))
-            testmedia.fastForward ();
+            mp->fastForward ();
         ImGui::PopButtonRepeat();
     }
     else {
@@ -178,7 +105,7 @@ void drawMediaPlayer()
 
         ImGui::PushButtonRepeat(true);
         if (ImGui::Button(ICON_FA_STEP_FORWARD))
-            testmedia.seekNextFrame();
+            mp->seekNextFrame();
         ImGui::PopButtonRepeat();
     }
 
@@ -195,48 +122,32 @@ void drawMediaPlayer()
     ImGui::SameLine(0, spacing);
     ImGui::SetNextItemWidth(90);
     if ( ImGui::SliderInt("", &current_loop, 0, 2, current_loop_name) )
-        testmedia.setLoop( (MediaPlayer::LoopMode) current_loop );
+        mp->setLoop( (MediaPlayer::LoopMode) current_loop );
 
-    float speed = static_cast<float>(testmedia.playSpeed());
+    float speed = static_cast<float>(mp->playSpeed());
     ImGui::SameLine(0, spacing);
     ImGui::SetNextItemWidth(270);
     // ImGui::SetNextItemWidth(width - 90.0);
     if (ImGui::SliderFloat( "Speed", &speed, -10.f, 10.f, "x %.1f", 2.f))
-        testmedia.setPlaySpeed( static_cast<double>(speed) );
+        mp->setPlaySpeed( static_cast<double>(speed) );
     ImGui::SameLine(0, spacing);
     if (ImGuiToolkit::ButtonIcon(19, 15)) {
         speed = 1.f;
-        testmedia.setPlaySpeed( static_cast<double>(speed) );
+        mp->setPlaySpeed( static_cast<double>(speed) );
     }
 
-    guint64 current_t = testmedia.position();
+    guint64 current_t = mp->position();
     guint64 seek_t = current_t;
 
     bool slider_pressed = ImGuiToolkit::TimelineSlider( "simpletimeline", &seek_t,
-                                                        testmedia.duration(), testmedia.frameDuration());
+                                                        mp->duration(), mp->frameDuration());
-
-//    std::list<std::pair<guint64, guint64> > segments = testmedia.getPlaySegments();
-//    bool slider_pressed = ImGuiToolkit::TimelineSliderEdit( "timeline", &seek_t, testmedia.Duration(),
-//                                                        testmedia.FrameDuration(), segments);
-
-//    if (!segments.empty()) {
-//        // segments have been modified
-//        g_print("Segments modified \n");
-
-//        for (std::list< std::pair<guint64, guint64> >::iterator s = segments.begin(); s != segments.end(); s++){
-//            MediaSegment newsegment(s->first, s->second);
-//            testmedia.removeAllPlaySegmentOverlap(newsegment);
-//            if (!testmedia.addPlaySegment(newsegment))
-//                g_print("new Segment could not be added \n");
-//        }
-//    }
 
     // if the seek target time is different from the current position time
     // (i.e. the difference is less than one frame)
-    if ( ABS_DIFF (current_t, seek_t) > testmedia.frameDuration() ) {
+    if ( ABS_DIFF (current_t, seek_t) > mp->frameDuration() ) {
 
         // request seek (ASYNC)
-        testmedia.seekTo(seek_t);
+        mp->seekTo(seek_t);
     }
 
     // play/stop command should be following the playing mode (buttons)
@@ -246,13 +157,13 @@ void drawMediaPlayer()
     // apply play action to media only if status should change
     // NB: The seek command performed an ASYNC state change, but
     // gst_element_get_state called in isPlaying() will wait for the state change to complete.
-    if ( testmedia.isPlaying() != media_play ) {
+    if ( mp->isPlaying() != media_play ) {
-        testmedia.play( media_play );
+        mp->play( media_play );
     }
 
     // display info
-    ImGui::Text("%s %d x %d", testmedia.codec().c_str(), testmedia.width(), testmedia.height());
+    ImGui::Text("%s %d x %d", mp->codec().c_str(), mp->width(), mp->height());
-    ImGui::Text("Framerate %.2f / %.2f", testmedia.updateFrameRate() , testmedia.frameRate() );
+    ImGui::Text("Framerate %.2f / %.2f", mp->updateFrameRate() , mp->frameRate() );
 
     ImGui::End();
 }
@@ -260,24 +171,34 @@ void drawMediaPlayer()
 
 void drawScene()
 {
+    // compute dt
     static gint64 last_time = gst_util_get_timestamp ();
     gint64 current_time = gst_util_get_timestamp ();
     gint64 dt = current_time - last_time;
+    last_time = current_time;
 
+    // recursive update from root of scene
     glm::mat4 MV = glm::identity<glm::mat4>();
-    glm::mat4 P = Rendering::manager().Projection();
+    glm::mat4 P  = glm::scale( glm::ortho(-5.f, 5.f, -5.f, 5.f), glm::vec3(1.f, output->aspectRatio(), 1.f));
+
 //    glm::mat4 View = glm::translate(glm::identity<glm::mat4>(), glm::vec3(0, 0, 0.f));
 //    View = glm::rotate(View, 0.f, glm::vec3(0.0f, 0.0f, 1.0f));
 //    glm::mat4 Model = glm::scale(glm::identity<glm::mat4>(), glm::vec3(1, 1, 1));
 //    mv = View * Model;
-
     scene.root_.update( static_cast<float>( GST_TIME_AS_MSECONDS(dt)) * 0.001f );
 
+    // draw in output frame buffer
     output->bind();
     scene.root_.draw(MV, P);
     FrameBuffer::release();
 
-    last_time = current_time;
+    // draw GUI tree scene
+    ImGui::Begin(IMGUI_TITLE_MAINWINDOW);
+
+    static ImGuiVisitor v;
+    scene.accept(v);
+
+    ImGui::End();
 }
 
 
@@ -285,7 +206,9 @@ void drawPreview()
 {
     if (output)
     {
-        ImGui::Begin("Preview");
+        ImGui::SetNextWindowPos(ImVec2(100, 300), ImGuiCond_FirstUseEver);
+        ImGui::SetNextWindowSize(ImVec2(640, 480), ImGuiCond_FirstUseEver);
+        ImGui::Begin(ICON_FA_LAPTOP " Preview");
         float width = ImGui::GetContentRegionAvail().x;
 
         ImVec2 imagesize ( width, width / output->aspectRatio());
@@ -293,6 +216,8 @@ void drawPreview()
 
         ImGui::End();
     }
+
+
 }
 
 
@@ -323,47 +248,16 @@ int main(int, char**)
     gst_debug_set_active(TRUE);
 #endif
 
-////     testmedia.Open("file:///home/bhbn/Videos/MOV001.MOD");
-////     testmedia.Open("file:///home/bhbn/Videos/TestFormats/Commodore64GameReviewMoondust.flv");
-////     testmedia.Open("file:///home/bhbn/Videos/fish.mp4");
-////    testmedia.Open("file:///home/bhbn/Videos/jean/Solitude1080p.mov");
-//    testmedia.Open("file:///home/bhbn/Videos/TearsOfSteel_720p_h265.mkv");
-////    testmedia.Open("file:///home/bhbn/Videos/TestFormats/_h264GoldenLamps.mkv");
-////    testmedia.Open("file:///home/bhbn/Videos/TestEncoding/vpxvp9high.webm");
-////    testmedia.Open("file:///home/bhbn/Videos/iss.mov");
-//    testmedia.Play(false);
-
-    // Add draw callbacks to the Rendering
-//    Rendering::manager().AddDrawCallback(drawMediaPlayer);
-
-////    testmedia2.Open("file:///home/bhbn/Images/Butterfly.gif");
-////    testmedia2.Open("file:///home/bhbn/Images/Scan-090614-0022.jpg");
-////    testmedia2.Open("file:///home/bhbn/Images/svg/abstract.svg");
-//    testmedia2.Open("file:///home/bhbn/Videos/iss.mov");
-////    testmedia2.Open("file:///home/bhbn/Images/4k/colors-3840x2160-splash-4k-18458.jpg");
-////    testmedia2.Open("file:///home/bhbn/Videos/Upgrade.2018.720p.AMZN.WEB-DL.DDP5.1.H.264-NTG.m4v");
-//    testmedia2.Play(true);
-//    // create our geometries
-//    create_square_glm(vbo, vao, ebo);
-//    // Add draw callbacks to the Rendering
-//    Rendering::manager().AddDrawCallback(drawMediaBackgound);
-
 //     test text editor
 //    UserInterface::manager().OpenTextEditor( Resource::getText("shaders/texture-shader.fs") );
 
-
     // init the scene
     scene.root_.init();
-    Rendering::manager().PushBackDrawCallback(drawScene);
+    Rendering::manager().PushFrontDrawCallback(drawScene);
 
-    // create and add a elements to the scene
+    // init elements to the scene
-    MediaSurface testnode1("file:///home/bhbn/Videos/iss.mov");
     testnode1.init();
-
-    MediaSurface testnode2("file:///home/bhbn/Videos/fish.mp4");
     testnode2.init();
-
-    ImageSurface testnode3("images/v-mix_256x256.png");
     testnode3.init();
     testnode3.getShader()->blending = Shader::BLEND_ADD;
 
@@ -375,10 +269,12 @@ int main(int, char**)
     Group g1;
     g1.init();
     g1.transform_ = glm::translate(glm::identity<glm::mat4>(), glm::vec3(1.f, 1.f, 0.f));
+    g1.transform_ = glm::scale(g1.transform_, glm::vec3(2.f, 2.f, 2.f));
 
     Switch g2;
     g2.init();
     g2.transform_ = glm::translate(glm::identity<glm::mat4>(), glm::vec3(-1.f, -1.f, 0.f));
+    g2.transform_ = glm::rotate(g2.transform_, 0.672f, glm::vec3(0.0f, 0.0f, 1.0f));
 
     // build tree
     g1.addChild(&testnode3);
@@ -394,6 +290,9 @@ int main(int, char**)
     output = new FrameBuffer(1280, 720);
     Rendering::manager().PushBackDrawCallback(drawPreview);
 
+    // add media player
+    Rendering::manager().PushBackDrawCallback(drawMediaPlayer);
+
     ///
     /// Main LOOP
     ///
@@ -402,12 +301,9 @@ int main(int, char**)
         Rendering::manager().Draw();
     }
 
-    testmedia.close();
-    testmedia2.close();
 
     SessionVisitor savetoxml;
     scene.accept(savetoxml);
-    scene.accept(savetoxml);
     savetoxml.save("/home/bhbn/test.vmx");
 
     UserInterface::manager().Terminate();

snippets.cpp

@@ -1,3 +1,13 @@
+
+// old stuff
+ImageShader rendering_shader;
+MediaPlayer testmedia;
+MediaPlayer testmedia2("testmedia2");
+unsigned int vbo, vao, ebo;
+float texturear = 1.0;
+GLuint textureimagepng = 0;
+
+
 GLuint loadPNG(const char *imagepath, float *aspectrato)
 {
     int w, h, n, image;
@@ -95,4 +105,212 @@ void create_square_glm(unsigned int &vbo, unsigned int &vao, unsigned int &ebo)
 
 }
 
+// from https://gstreamer.freedesktop.org/documentation/application-development/advanced/pipeline-manipulation.html?gi-language=c
+
+void drawMediaBackgound()
+{
+    if ( !testmedia2.isOpen() )
+        return;
+
+    //
+    // RENDER SOURCE
+    //
+    testmedia2.update();
+
+    // use the shader
+    rendering_shader.projection = Rendering::manager().Projection();
+    rendering_shader.modelview = glm::identity<glm::mat4>();;
+    rendering_shader.use();
+    // use the media
+    testmedia2.bind();
+    // draw the vertex array
+    glBindVertexArray(vao);
+    glDrawElements(GL_TRIANGLE_STRIP, 4, GL_UNSIGNED_INT, 0);
+    glBindVertexArray(0);
+    glBindTexture(GL_TEXTURE_2D, 0);
+
+    //
+    // GUI to control SOURCE
+    //
+    {
+        ImGui::Begin("Image properties");
+
+        // MODEL VIEW
+        static float translation[] = {0.f, 0.f};
+        if (ImGuiToolkit::ButtonIcon(6, 15)) {
+            translation[0] = 0.f;
+            translation[1] = 0.f;
+        }
+        ImGui::SameLine(0, 10);
+        ImGui::SliderFloat2("position", translation, -5.0, 5.0);
+
+        static float rotation = 0.f;
+        if (ImGuiToolkit::ButtonIcon(4, 15)) rotation = 0.f;
+        ImGui::SameLine(0, 10); 
+        ImGui::SliderFloat("rotation", &rotation, 0, 2 * PI);
+
+        static float scale = 1.f;
+        if (ImGuiToolkit::ButtonIcon(3, 15))  scale = 1.f;
+        ImGui::SameLine(0, 10);
+        ImGui::SliderFloat("scale", &scale, 0.1f, 10.f, "%.3f", 3.f);
+
+        // set modelview
+//        rendering_shader.setModelview(translation[0], translation[1], rotation, scale, testmedia2.AspectRatio());
+
+        // color picker
+        if (ImGuiToolkit::ButtonIcon(16, 8))  rendering_shader.color = glm::vec4(1.f);
+        ImGui::SameLine(0, 10);
+        ImGui::ColorEdit3("color", glm::value_ptr(rendering_shader.color) ) ;
+        // brightness slider
+        if (ImGuiToolkit::ButtonIcon(4, 1)) rendering_shader.brightness = 0.f;
+        ImGui::SameLine(0, 10);
+        ImGui::SliderFloat("brightness", &rendering_shader.brightness, -1.0, 1.0, "%.3f", 2.f);
+        // contrast slider
+        if (ImGuiToolkit::ButtonIcon(2, 1)) rendering_shader.contrast = 0.f;
+        ImGui::SameLine(0, 10);
+        ImGui::SliderFloat("contrast", &rendering_shader.contrast, -1.0, 1.0, "%.3f", 2.f);
+
+        ImGui::End();
+    }
+
+}
+
+void drawMediaPlayer()
+{
+    static GstClockTime begin = GST_CLOCK_TIME_NONE;
+    static GstClockTime end = GST_CLOCK_TIME_NONE;
+
+    if ( !testmedia.isOpen() )
+        return;
+
+    testmedia.update();
+
+    if ( begin == GST_CLOCK_TIME_NONE) {
+
+        begin = testmedia.duration() / 5;
+        end = testmedia.duration() / 3;
+//        if ( testmedia.addPlaySegment(begin, end) )
+//            std::cerr << " - first segment " << std::endl;
+
+//        begin *= 2;
+//        end *= 2;
+//        if ( testmedia.addPlaySegment(begin, end) )
+//            std::cerr << " - second segment " << std::endl;
+
+    }
+
+    ImGui::Begin("Media Player");
+    float width = ImGui::GetContentRegionAvail().x;
+    float spacing = ImGui::GetStyle().ItemInnerSpacing.x;
+
+    ImVec2 imagesize ( width, width / testmedia.aspectRatio());
+    ImGui::Image((void*)(intptr_t)testmedia.texture(), imagesize);
+
+    if (ImGui::Button(ICON_FA_FAST_BACKWARD))
+        testmedia.rewind();
+    ImGui::SameLine(0, spacing);
+
+    // remember playing mode of the GUI
+    static bool media_playing_mode = testmedia.isPlaying();
+
+    // display buttons Play/Stop depending on current playing mode
+    if (media_playing_mode) {
+
+        if (ImGui::Button(ICON_FA_STOP " Stop"))
+            media_playing_mode = false;
+        ImGui::SameLine(0, spacing);
+
+        ImGui::PushButtonRepeat(true);
+         if (ImGui::Button(ICON_FA_FORWARD))
+            testmedia.fastForward ();
+        ImGui::PopButtonRepeat();
+    }
+    else {
+
+        if (ImGui::Button(ICON_FA_PLAY "  Play"))
+            media_playing_mode = true;
+        ImGui::SameLine(0, spacing);
+
+        ImGui::PushButtonRepeat(true);
+        if (ImGui::Button(ICON_FA_STEP_FORWARD))
+            testmedia.seekNextFrame();
+        ImGui::PopButtonRepeat();
+    }
+
+    ImGui::SameLine(0, spacing * 2.f);
+    ImGui::Dummy(ImVec2(width - 700.0, 0));  // right align
+
+    static int current_loop = 1;
+    static const char* loop_names[3] = { "Stop", "Rewind", "Bounce" };
+    const char* current_loop_name = loop_names[current_loop];
+    ImGui::SameLine(0, spacing);
+    if (current_loop == 0)  ImGuiToolkit::Icon(0, 15);
+    else if (current_loop == 1)  ImGuiToolkit::Icon(1, 15);
+    else ImGuiToolkit::Icon(19, 14);
+    ImGui::SameLine(0, spacing);
+    ImGui::SetNextItemWidth(90);
+    if ( ImGui::SliderInt("", &current_loop, 0, 2, current_loop_name) )
+        testmedia.setLoop( (MediaPlayer::LoopMode) current_loop );
+
+    float speed = static_cast<float>(testmedia.playSpeed());
+    ImGui::SameLine(0, spacing);
+    ImGui::SetNextItemWidth(270);
+    // ImGui::SetNextItemWidth(width - 90.0);
+    if (ImGui::SliderFloat( "Speed", &speed, -10.f, 10.f, "x %.1f", 2.f))
+        testmedia.setPlaySpeed( static_cast<double>(speed) );
+    ImGui::SameLine(0, spacing);
+    if (ImGuiToolkit::ButtonIcon(19, 15)) {
+        speed = 1.f;
+        testmedia.setPlaySpeed( static_cast<double>(speed) );
+    }
+
+    guint64 current_t = testmedia.position();
+    guint64 seek_t = current_t;
+
+    bool slider_pressed = ImGuiToolkit::TimelineSlider( "simpletimeline", &seek_t,
+                                                        testmedia.duration(), testmedia.frameDuration());
+
+//    std::list<std::pair<guint64, guint64> > segments = testmedia.getPlaySegments();
+//    bool slider_pressed = ImGuiToolkit::TimelineSliderEdit( "timeline", &seek_t, testmedia.Duration(),
+//                                                        testmedia.FrameDuration(), segments);
+
+//    if (!segments.empty()) {
+//        // segments have been modified
+//        g_print("Segments modified \n");
+
+//        for (std::list< std::pair<guint64, guint64> >::iterator s = segments.begin(); s != segments.end(); s++){
+//            MediaSegment newsegment(s->first, s->second);
+//            testmedia.removeAllPlaySegmentOverlap(newsegment);
+//            if (!testmedia.addPlaySegment(newsegment))
+//                g_print("new Segment could not be added \n");
+//        }
+//    }
+
+    // if the seek target time is different from the current position time
+    // (i.e. the difference is less than one frame)
+    if ( ABS_DIFF (current_t, seek_t) > testmedia.frameDuration() ) {
+
+        // request seek (ASYNC)
+        testmedia.seekTo(seek_t);
+    }
+
+    // play/stop command should be following the playing mode (buttons)
+    // AND force to stop when the slider is pressed
+    bool media_play = media_playing_mode & (!slider_pressed);
+
+    // apply play action to media only if status should change
+    // NB: The seek command performed an ASYNC state change, but
+    // gst_element_get_state called in isPlaying() will wait for the state change to complete.
+    if ( testmedia.isPlaying() != media_play ) {
+        testmedia.play( media_play );
+    }
+
+    // display info
+    ImGui::Text("%s %d x %d", testmedia.codec().c_str(), testmedia.width(), testmedia.height());
+    ImGui::Text("Framerate %.2f / %.2f", testmedia.updateFrameRate() , testmedia.frameRate() );
+
+    ImGui::End();
+}
+
+