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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 nullptr;
return reinterpret_cast<void *>(glctx->getProcAddress(QByteArray(name)));
}
MpvWidget::MpvWidget(QWidget *parent, Qt::WindowFlags f)
: QOpenGLWidget(parent, f)
{
mpv = 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");
// Request hw decoding, just for testing.
mpv::qt::set_option_variant(mpv, "hwdec", "auto");
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_render_context_free(mpv_gl);
mpv_terminate_destroy(mpv);
}
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()
{
mpv_opengl_init_params gl_init_params[1] = {get_proc_address, nullptr};
mpv_render_param params[]{
{MPV_RENDER_PARAM_API_TYPE, const_cast<char *>(MPV_RENDER_API_TYPE_OPENGL)},
{MPV_RENDER_PARAM_OPENGL_INIT_PARAMS, &gl_init_params},
{MPV_RENDER_PARAM_INVALID, nullptr}
};
if (mpv_render_context_create(&mpv_gl, mpv, params) < 0)
throw std::runtime_error("failed to initialize mpv GL context");
mpv_render_context_set_update_callback(mpv_gl, MpvWidget::on_update, reinterpret_cast<void *>(this));
}
void MpvWidget::paintGL()
{
mpv_opengl_fbo mpfbo{static_cast<int>(defaultFramebufferObject()), width(), height(), 0};
int flip_y{1};
mpv_render_param params[] = {
{MPV_RENDER_PARAM_OPENGL_FBO, &mpfbo},
{MPV_RENDER_PARAM_FLIP_Y, &flip_y},
{MPV_RENDER_PARAM_INVALID, nullptr}
};
// See render_gl.h on what OpenGL environment mpv expects, and
// other API details.
mpv_render_context_render(mpv_gl, params);
}
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_render_context_render() 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 render 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());
doneCurrent();
} else {
update();
}
}
void MpvWidget::on_update(void *ctx)
{
QMetaObject::invokeMethod((MpvWidget*)ctx, "maybeUpdate");
}
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