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#include "main.h"
#include <stdexcept>
#include <clocale>
#include <QObject>
#include <QtGlobal>
#include <QOpenGLContext>
#include <QGuiApplication>
#include <QtGui/QOpenGLFramebufferObject>
#include <QtQuick/QQuickWindow>
#include <QtQuick/QQuickView>
namespace
{
void on_mpv_events(void *ctx)
{
Q_UNUSED(ctx)
}
void on_mpv_redraw(void *ctx)
{
MpvObject::on_update(ctx);
}
static void *get_proc_address_mpv(void *ctx, const char *name)
{
Q_UNUSED(ctx)
QOpenGLContext *glctx = QOpenGLContext::currentContext();
if (!glctx) return nullptr;
return reinterpret_cast<void *>(glctx->getProcAddress(QByteArray(name)));
}
}
class MpvRenderer : public QQuickFramebufferObject::Renderer
{
MpvObject *obj;
public:
MpvRenderer(MpvObject *new_obj)
: obj{new_obj}
{
mpv_set_wakeup_callback(obj->mpv, on_mpv_events, nullptr);
}
virtual ~MpvRenderer()
{}
// This function is called when a new FBO is needed.
// This happens on the initial frame.
QOpenGLFramebufferObject * createFramebufferObject(const QSize &size)
{
// init mpv_gl:
if (!obj->mpv_gl)
{
mpv_opengl_init_params gl_init_params[1] = {get_proc_address_mpv, 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(&obj->mpv_gl, obj->mpv, params) < 0)
throw std::runtime_error("failed to initialize mpv GL context");
mpv_render_context_set_update_callback(obj->mpv_gl, on_mpv_redraw, obj);
}
return QQuickFramebufferObject::Renderer::createFramebufferObject(size);
}
void render()
{
obj->window()->resetOpenGLState();
QOpenGLFramebufferObject *fbo = framebufferObject();
mpv_opengl_fbo mpfbo{.fbo = static_cast<int>(fbo->handle()), .w = fbo->width(), .h = fbo->height(), .internal_format = 0};
int flip_y{0};
mpv_render_param params[] = {
// Specify the default framebuffer (0) as target. This will
// render onto the entire screen. If you want to show the video
// in a smaller rectangle or apply fancy transformations, you'll
// need to render into a separate FBO and draw it manually.
{MPV_RENDER_PARAM_OPENGL_FBO, &mpfbo},
// Flip rendering (needed due to flipped GL coordinate system).
{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(obj->mpv_gl, params);
obj->window()->resetOpenGLState();
}
};
MpvObject::MpvObject(QQuickItem * parent)
: QQuickFramebufferObject(parent), mpv{mpv_create()}, mpv_gl(nullptr)
{
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");
connect(this, &MpvObject::onUpdate, this, &MpvObject::doUpdate,
Qt::QueuedConnection);
}
MpvObject::~MpvObject()
{
if (mpv_gl) // only initialized if something got drawn
{
mpv_render_context_free(mpv_gl);
}
mpv_terminate_destroy(mpv);
}
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()
{
update();
}
void MpvObject::command(const QVariant& params)
{
mpv::qt::command_variant(mpv, params);
}
void MpvObject::setProperty(const QString& name, const QVariant& value)
{
mpv::qt::set_property_variant(mpv, name, value);
}
QQuickFramebufferObject::Renderer *MpvObject::createRenderer() const
{
window()->setPersistentOpenGLContext(true);
window()->setPersistentSceneGraph(true);
return new MpvRenderer(const_cast<MpvObject *>(this));
}
int main(int argc, char **argv)
{
QGuiApplication app(argc, argv);
// Qt sets the locale in the QGuiApplication constructor, but libmpv
// requires the LC_NUMERIC category to be set to "C", so change it back.
std::setlocale(LC_NUMERIC, "C");
qmlRegisterType<MpvObject>("mpvtest", 1, 0, "MpvObject");
QQuickView view;
view.setResizeMode(QQuickView::SizeRootObjectToView);
view.setSource(QUrl("qrc:///mpvtest/main.qml"));
view.show();
return app.exec();
}
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