1 files changed, 128 insertions, 0 deletions
diff --git a/DOCS/client_api_examples/qt_opengl/mpvwidget.cpp b/DOCS/client_api_examples/qt_opengl/mpvwidget.cpp
new file mode 100644
index 0000000000..2f3bf7e200
--- /dev/null
+++ b/DOCS/client_api_examples/qt_opengl/mpvwidget.cpp
@@ -0,0 +1,128 @@
+#include "mpvwidget.h"
+#include <stdexcept>
+#include <QtGui/QOpenGLContext>
+#include <QtCore/QMetaObject>
+
+static void wakeup(void *ctx)
+{
+    QMetaObject::invokeMethod((MpvWidget*)ctx, "on_mpv_events", Qt::QueuedConnection);
+}
+
+static void *get_proc_address(void *ctx, const char *name) {
+    Q_UNUSED(ctx);
+    QOpenGLContext *glctx = QOpenGLContext::currentContext();
+    if (!glctx)
+        return NULL;
+    return (void *)glctx->getProcAddress(QByteArray(name));
+}
+
+MpvWidget::MpvWidget(QWidget *parent, Qt::WindowFlags f)
+    : QOpenGLWidget(parent, f)
+{
+    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");
+
+    // Request hw decoding, just for testing.
+    mpv::qt::set_option_variant(mpv, "hwdec", "auto");
+
+    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, MpvWidget::on_update, (void *)this);
+    connect(this, SIGNAL(frameSwapped()), SLOT(swapped()));
+
+    mpv_observe_property(mpv, 0, "duration", MPV_FORMAT_DOUBLE);
+    mpv_observe_property(mpv, 0, "time-pos", MPV_FORMAT_DOUBLE);
+    mpv_set_wakeup_callback(mpv, wakeup, this);
+}
+
+MpvWidget::~MpvWidget()
+{
+    if (mpv_gl)
+        mpv_opengl_cb_set_update_callback(mpv_gl, NULL, NULL);
+    // 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 MpvWidget::command(const QVariant& params)
+{
+    mpv::qt::command_variant(mpv, params);
+}
+
+void MpvWidget::setProperty(const QString& name, const QVariant& value)
+{
+    mpv::qt::set_property_variant(mpv, name, value);
+}
+
+QVariant MpvWidget::getProperty(const QString &name) const
+{
+    return mpv::qt::get_property_variant(mpv, name);
+}
+
+void MpvWidget::initializeGL()
+{
+    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");
+}
+
+void MpvWidget::paintGL()
+{
+    mpv_opengl_cb_draw(mpv_gl, QOpenGLContext::currentContext()->defaultFramebufferObject(), width(), -height());
+}
+
+void MpvWidget::swapped()
+{
+    mpv_opengl_cb_report_flip(mpv_gl, 0);
+}
+
+void MpvWidget::on_mpv_events()
+{
+    // Process all events, until the event queue is empty.
+    while (mpv) {
+        mpv_event *event = mpv_wait_event(mpv, 0);
+        if (event->event_id == MPV_EVENT_NONE) {
+            break;
+        }
+        handle_mpv_event(event);
+    }
+}
+
+void MpvWidget::handle_mpv_event(mpv_event *event)
+{
+    switch (event->event_id) {
+    case MPV_EVENT_PROPERTY_CHANGE: {
+        mpv_event_property *prop = (mpv_event_property *)event->data;
+        if (strcmp(prop->name, "time-pos") == 0) {
+            if (prop->format == MPV_FORMAT_DOUBLE) {
+                double time = *(double *)prop->data;
+                Q_EMIT positionChanged(time);
+            }
+        } else if (strcmp(prop->name, "duration") == 0) {
+            if (prop->format == MPV_FORMAT_DOUBLE) {
+                double time = *(double *)prop->data;
+                Q_EMIT durationChanged(time);
+            }
+        }
+        break;
+    }
+    default: ;
+        // Ignore uninteresting or unknown events.
+    }
+}
+
+void MpvWidget::on_update(void *ctx)
+{
+    QMetaObject::invokeMethod((MpvWidget*)ctx, "update");
+}