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// License: pick one of: public domain, WTFPL, ISC, Ms-PL, AGPLv3
// This example can be built with: qmake && make
#include <sstream>
#include <QFileDialog>
#include <QStatusBar>
#include <QMenuBar>
#include <QMenu>
#include <QGridLayout>
#include <QApplication>
#include "qtexample.h"
static void wakeup(void *ctx)
{
// This callback is invoked from any mpv thread (but possibly also
// recursively from a thread that is calling the mpv API). Just notify
// the Qt GUI thread to wake up (so that it can process events with
// mpv_wait_event()), and return as quickly as possible.
MainWindow *mainwindow = (MainWindow *)ctx;
QCoreApplication::postEvent(mainwindow, new QEvent(QEvent::User));
}
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent)
{
QMenu *menu = menuBar()->addMenu(tr("&File"));
QAction *on_open = new QAction(tr("&Open"), this);
on_open->setShortcuts(QKeySequence::Open);
on_open->setStatusTip(tr("Open a file"));
connect(on_open, SIGNAL(triggered()), this, SLOT(on_file_open()));
menu->addAction(on_open);
statusBar();
mpv = mpv_create();
if (!mpv)
throw "can't create mpv instance";
// Create a video child window. Force Qt to create a native window, and
// pass the window ID to the mpv wid option. This doesn't work on OSX,
// because Cocoa doesn't support this form of embedding.
mpv_container = new QWidget(this);
setCentralWidget(mpv_container);
mpv_container->setAttribute(Qt::WA_NativeWindow);
int64_t wid = mpv_container->winId();
mpv_set_option(mpv, "wid", MPV_FORMAT_INT64, &wid);
// Enable default bindings, because we're lazy. Normally, a player using
// mpv as backend would implement its own key bindings.
mpv_set_option_string(mpv, "input-default-bindings", "yes");
// Let us receive property change events with MPV_EVENT_PROPERTY_CHANGE if
// this property changes.
mpv_observe_property(mpv, 0, "time-pos", MPV_FORMAT_DOUBLE);
// From this point on, the wakeup function will be called. The callback
// can come from any thread, so we use the Qt QEvent mechanism to relay
// the wakeup in a thread-safe way.
mpv_set_wakeup_callback(mpv, wakeup, this);
if (mpv_initialize(mpv) < 0)
throw "mpv failed to initialize";
}
void MainWindow::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;
std::stringstream ss;
ss << "At: " << time;
statusBar()->showMessage(QString::fromStdString(ss.str()));
} else if (prop->format == MPV_FORMAT_NONE) {
// The property is unavailable, which probably means playback
// was stopped.
statusBar()->showMessage("");
}
}
break;
}
case MPV_EVENT_SHUTDOWN: {
mpv_terminate_destroy(mpv);
mpv = NULL;
break;
}
default: ;
// Ignore uninteresting or unknown events.
}
}
bool MainWindow::event(QEvent *event)
{
// QEvent::User is sent by wakeup().
if (event->type() == QEvent::User) {
// 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);
}
return true;
}
return QMainWindow::event(event);
}
void MainWindow::on_file_open()
{
QString filename = QFileDialog::getOpenFileName(this, "Open file");
if (mpv) {
const QByteArray c_filename = filename.toUtf8();
const char *args[] = {"loadfile", c_filename.data(), NULL};
mpv_command_async(mpv, 0, args);
}
}
MainWindow::~MainWindow()
{
if (mpv)
mpv_terminate_destroy(mpv);
}
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow w;
w.show();
return a.exec();
}
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