1 files changed, 149 insertions, 0 deletions
diff --git a/DOCS/client_api_examples/qml_direct/main.cpp b/DOCS/client_api_examples/qml_direct/main.cpp
new file mode 100644
index 0000000000..b999d10ff4
--- /dev/null
+++ b/DOCS/client_api_examples/qml_direct/main.cpp
@@ -0,0 +1,149 @@
+#include "main.h"
+
+#include <stdexcept>
+
+#include <QObject>
+#include <QtGlobal>
+#include <QOpenGLContext>
+
+#include <QGuiApplication>
+#include <QtQuick/QQuickWindow>
+#include <QtQuick/QQuickView>
+
+static void *get_proc_address(void *ctx, const char *name) {
+    (void)ctx;
+    QOpenGLContext *glctx = QOpenGLContext::currentContext();
+    if (!glctx)
+        return NULL;
+    return (void *)glctx->getProcAddress(QByteArray(name));
+}
+
+MpvRenderer::MpvRenderer(mpv::qt::Handle a_mpv, mpv_opengl_cb_context *a_mpv_gl)
+    : mpv(a_mpv), mpv_gl(a_mpv_gl), window(0)
+{
+    int r = mpv_opengl_cb_init_gl(mpv_gl, NULL, get_proc_address, NULL);
+    if (r < 0)
+        throw std::runtime_error("could not initialize OpenGL");
+}
+
+MpvRenderer::~MpvRenderer()
+{
+    // Until this call is done, we need to make sure the player remains
+    // alive. This is done implicitly with the mpv::qt::Handle instance
+    // in this class.
+    mpv_opengl_cb_uninit_gl(mpv_gl);
+}
+
+void MpvRenderer::paint()
+{
+    window->resetOpenGLState();
+
+    // Render to the whole window.
+    QSize s = window->size() * window->devicePixelRatio();
+    int vp[4] = {0, 0, s.width(), -s.height()};
+
+    // This uses 0 as framebuffer, which indicates that mpv will render directly
+    // to the frontbuffer. Note that mpv will always switch framebuffers
+    // explicitly. Some QWindow setups (such as using QQuickWidget) actually
+    // want you to render into a FBO in the beforeRendering() signal, and this
+    // code won't work there.
+    mpv_opengl_cb_render(mpv_gl, 0, vp);
+
+    window->resetOpenGLState();
+}
+
+MpvObject::MpvObject(QQuickItem * parent)
+    : QQuickItem(parent), mpv_gl(0), renderer(0)
+{
+    mpv = mpv::qt::Handle::FromRawHandle(mpv_create());
+    if (!mpv)
+        throw std::runtime_error("could not create mpv context");
+
+    mpv_set_option_string(mpv, "terminal", "yes");
+    mpv_set_option_string(mpv, "msg-level", "all=v");
+
+    if (mpv_initialize(mpv) < 0)
+        throw std::runtime_error("could not initialize mpv context");
+
+    // Make use of the MPV_SUB_API_OPENGL_CB API.
+    mpv::qt::set_option_variant(mpv, "vo", "opengl-cb");
+
+    // Setup the callback that will make QtQuick update and redraw if there
+    // is a new video frame. Use a queued connection: this makes sure the
+    // doUpdate() function is run on the GUI thread.
+    mpv_gl = (mpv_opengl_cb_context *)mpv_get_sub_api(mpv, MPV_SUB_API_OPENGL_CB);
+    if (!mpv_gl)
+        throw std::runtime_error("OpenGL not compiled in");
+    mpv_opengl_cb_set_update_callback(mpv_gl, MpvObject::on_update, (void *)this);
+    connect(this, &MpvObject::onUpdate, this, &MpvObject::doUpdate,
+            Qt::QueuedConnection);
+
+    connect(this, &QQuickItem::windowChanged,
+            this, &MpvObject::handleWindowChanged);
+}
+
+MpvObject::~MpvObject()
+{
+    if (mpv_gl)
+        mpv_opengl_cb_set_update_callback(mpv_gl, NULL, NULL);
+}
+
+void MpvObject::handleWindowChanged(QQuickWindow *win)
+{
+    if (!win)
+        return;
+    connect(win, &QQuickWindow::beforeSynchronizing,
+            this, &MpvObject::sync, Qt::DirectConnection);
+    connect(win, &QQuickWindow::sceneGraphInvalidated,
+            this, &MpvObject::cleanup, Qt::DirectConnection);
+    win->setClearBeforeRendering(false);
+}
+
+void MpvObject::sync()
+{
+    if (!renderer) {
+        renderer = new MpvRenderer(mpv, mpv_gl);
+        connect(window(), &QQuickWindow::beforeRendering,
+                renderer, &MpvRenderer::paint, Qt::DirectConnection);
+    }
+    renderer->window = window();
+}
+
+void MpvObject::cleanup()
+{
+    if (renderer) {
+        delete renderer;
+        renderer = 0;
+    }
+}
+
+void MpvObject::on_update(void *ctx)
+{
+    MpvObject *self = (MpvObject *)ctx;
+    emit self->onUpdate();
+}
+
+// connected to onUpdate(); signal makes sure it runs on the GUI thread
+void MpvObject::doUpdate()
+{
+    window()->update();
+}
+
+void MpvObject::command(const QVariant& params)
+{
+    mpv::qt::command_variant(mpv, params);
+}
+
+int main(int argc, char **argv)
+{
+    QGuiApplication app(argc, argv);
+
+    qmlRegisterType<MpvObject>("mpvtest", 1, 0, "MpvObject");
+
+    QQuickView view;
+    view.setResizeMode(QQuickView::SizeRootObjectToView);
+    view.setSource(QUrl("qrc:///mpvtest/main.qml"));
+    view.show();
+
+    return app.exec();
+}