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#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()
{
makeCurrent();
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, 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.
}
}
// Make Qt invoke mpv_opengl_cb_draw() to draw a new/updated video frame.
void MpvWidget::maybeUpdate()
{
// If the Qt window is not visible, Qt's update() will just skip rendering.
// This confuses mpv's opengl-cb API, and may lead to small occasional
// freezes due to video rendering timing out.
// Handle this by manually redrawing.
// Note: Qt doesn't seem to provide a way to query whether update() will
// be skipped, and the following code still fails when e.g. switching
// to a different workspace with a reparenting window manager.
if (window()->isMinimized()) {
makeCurrent();
paintGL();
context()->swapBuffers(context()->surface());
swapped();
doneCurrent();
} else {
update();
}
}
void MpvWidget::on_update(void *ctx)
{
QMetaObject::invokeMethod((MpvWidget*)ctx, "maybeUpdate");
}
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