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videowidget.cpp
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videowidget.cpp
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#include <cstring>
#include <QMouseEvent>
#include <QOpenGLContext>
#include <QTimer>
#include "videowidget.h"
static const char cmdLoadFile[] = "loadfile";
static const char cmdStop[] = "stop";
static const char msgMpvCreateException[] = "could not create mpv context";
static const char msgMpvInitializeException[] = "could not initialize mpv context";
static const char msgRenderContextException[] = "failed to initialize mpv GL context";
static const char propDScale[] = "dscale";
static const char propDuration[] = "duration";
static const char propEofReached[] = "eof-reached";
static const char propHwdec[] = "hwdec";
static const char propKeepOpen[] = "keep-open";
static const char propPause[] = "pause";
static const char propTimePos[] = "time-pos";
static const char propVolume[] = "volume";
static const char value0[] = "0";
static const char value100[] = "100";
static const char valueAuto[] = "auto";
static const char valueNo[] = "no";
static const char valueYes[] = "yes";
static const char valueSpline36[] = "spline36";
static void mpvWakeUp(void *ctx)
{
QMetaObject::invokeMethod((VideoWidget*)ctx, "handleMpvEvents",
Qt::QueuedConnection);
}
static void *getGlProcAddress(void *ctx, const char *name)
{
Q_UNUSED(ctx);
QOpenGLContext *glCtx = QOpenGLContext::currentContext();
if (!glCtx)
return nullptr;
return reinterpret_cast<void*>(glCtx->getProcAddress(QByteArray(name)));
}
VideoWidget::VideoWidget(QWidget *parent) : QOpenGLWidget(parent)
{
setCursor(Qt::PointingHandCursor);
mpv = mpv_create();
if (!mpv)
throw std::runtime_error(msgMpvCreateException);
if (mpv_initialize(mpv) < 0)
throw std::runtime_error(msgMpvInitializeException);
mpv_set_option_string(mpv, "vo", "libmpv");
mpv_set_option_string(mpv, propHwdec, valueAuto);
mpv_set_option_string(mpv, propKeepOpen, valueYes);
mpv_set_option_string(mpv, propDScale, valueSpline36);
mpv_observe_property(mpv, 0, propDuration, MPV_FORMAT_DOUBLE);
mpv_observe_property(mpv, 0, propEofReached, MPV_FORMAT_FLAG);
mpv_observe_property(mpv, 0, propPause, MPV_FORMAT_FLAG);
mpv_observe_property(mpv, 0, propTimePos, MPV_FORMAT_DOUBLE);
mpv_set_wakeup_callback(mpv, mpvWakeUp, this);
}
VideoWidget::~VideoWidget()
{
makeCurrent();
if (mpvGL) {
mpv_render_context_free(mpvGL);
mpvGL = nullptr;
}
if (mpv) {
mpvCommand({cmdStop});
mpv_terminate_destroy(mpv);
mpv = nullptr;
} else {
abort();
}
}
void VideoWidget::setSilentMode(bool silent)
{
mpvSetProperty(propVolume, silent ? value0 : value100);
}
void VideoWidget::setEarlyStopMode(bool earlyStop)
{
earlyStopMode = earlyStop;
}
void VideoWidget::play(QString url)
{
if (!glInitialized) {
pendingFileOpen = url;
return;
}
mpvCommand({cmdLoadFile, url});
mpvSetProperty(propPause, valueNo);
}
void VideoWidget::stop()
{
mpvCommand({cmdStop});
mpvCommand({cmdLoadFile, ""});
}
void VideoWidget::pauseResume()
{
mpvSetProperty(propPause, !mpvPaused ? valueYes : valueNo);
}
void VideoWidget::initializeGL()
{
mpv_opengl_init_params glInitParams {
getGlProcAddress, nullptr, nullptr
};
mpv_render_param renderParams[] {
{ MPV_RENDER_PARAM_API_TYPE, const_cast<char*>(MPV_RENDER_API_TYPE_OPENGL) },
{ MPV_RENDER_PARAM_OPENGL_INIT_PARAMS, (void*)(&glInitParams) },
{ MPV_RENDER_PARAM_INVALID, nullptr }
};
if (mpv_render_context_create(&mpvGL, mpv, renderParams) < 0)
throw std::runtime_error(msgRenderContextException);
mpv_render_context_set_update_callback(mpvGL, VideoWidget::onMpvGLUpdate,
reinterpret_cast<void*>(this));
glInitialized = true;
if (!pendingFileOpen.isEmpty()) {
QTimer::singleShot(100, this, [this] {
play(pendingFileOpen);
pendingFileOpen.clear();
});
}
}
void VideoWidget::paintGL()
{
qreal scale = devicePixelRatioF();
mpv_opengl_fbo mpvFbo {
static_cast<int>(defaultFramebufferObject()),
int(width()*scale), int(height()*scale), 0
};
int flipY = 1;
mpv_render_param renderParams[] = {
{ MPV_RENDER_PARAM_OPENGL_FBO, &mpvFbo },
{ MPV_RENDER_PARAM_FLIP_Y, &flipY },
{ MPV_RENDER_PARAM_INVALID, nullptr }
};
mpv_render_context_render(mpvGL, renderParams);
}
void VideoWidget::mousePressEvent(QMouseEvent *event)
{
if (event->button() == Qt::LeftButton)
pauseResume();
}
void VideoWidget::handleMpvEvents()
{
while (mpv) {
mpv_event *event = mpv_wait_event(mpv, 0);
if (event->event_id == MPV_EVENT_NONE) {
break;
}
handleMpvEvent(event);
}
}
void VideoWidget::handleMpvEvent(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, propTimePos)) {
if (prop->format == MPV_FORMAT_DOUBLE) {
double time = *(double*)prop->data;
emit positionChanged(time);
if (earlyStopMode && time > 5.0) {
mpvSetProperty(propPause, valueYes);
}
}
} else if (!strcmp(prop->name, propDuration)) {
if (prop->format == MPV_FORMAT_DOUBLE) {
double time = *(double*)prop->data;
emit durationChanged(time);
}
} else if (!strcmp(prop->name, propEofReached)) {
if (prop->format == MPV_FORMAT_FLAG) {
bool flag = *(bool*)prop->data;
if (flag)
emit eofReached();
}
} else if (!strcmp(prop->name, propPause)) {
if (prop->format == MPV_FORMAT_FLAG) {
bool flag = *(bool*)prop->data;
mpvPaused = flag;
}
}
break;
}
default:
;
}
}
void VideoWidget::maybeUpdate()
{
if (window()->isMinimized()) {
makeCurrent();
paintGL();
context()->swapBuffers(context()->surface());
doneCurrent();
} else {
update();
}
}
void VideoWidget::mpvCommand(const QStringList ¶ms)
{
int n = params.count();
char *args[n+1];
QList<QByteArray> data;
for (int i = 0; i < n; i++) {
data.append(params[i].toUtf8());
args[i] = data[i].data();
}
args[n] = nullptr;
mpv_command(mpv, (const char**)args);
}
void VideoWidget::mpvSetProperty(const QString &name, const QString &value)
{
QByteArray cName = name.toUtf8();
QByteArray cValue = value.toUtf8();
mpv_set_property_string(mpv, cName.data(), cValue.data());
}
void VideoWidget::onMpvGLUpdate(void *ctx)
{
QMetaObject::invokeMethod((VideoWidget*)ctx,
"maybeUpdate");
}