qwasmscreencapture.cpp

Go to the documentation of this file.

// Copyright (C) 2022 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
#include "qwasmscreencapture_p.h"
 
#include "qwasmmediacapturesession_p.h"
#include "qwasmcamera_p.h"
#include "qwasmvideosink_p.h"
 
#include <QtMultimedia/qmediacapturesession.h>
 
QT_BEGIN_NAMESPACE
 
Q_LOGGING_CATEGORY(qLcWasmsSreenCapture, "qt.multimedia.wasm.screencapture")
 
QWasmScreenCapture::QWasmScreenCapture(QScreenCapture *screenCap)
    : QPlatformSurfaceCapture(ScreenSource{})
{
    m_screenCapture = screenCap;
}
 
QWasmScreenCapture::~QWasmScreenCapture() = default;
 
QVideoFrameFormat QWasmScreenCapture::frameFormat() const
{
    return {};
}
 
bool QWasmScreenCapture::setActiveInternal(bool active)
{
    if (active)
        m_captureSession->setVideoSource("monitor");
    else
        m_captureSession->setVideoSource("");
    return true;
}
 
void QWasmScreenCapture::setCaptureSession(QPlatformMediaCaptureSession *session)
{
    m_captureSession = static_cast<QWasmMediaCaptureSession *>(session);
}
 
void QWasmScreenCapture::setVideoStream(emscripten::val stream)
{
    if (m_videoOutput) {
        emscripten::val videoTracks = stream.call<emscripten::val>("getVideoTracks");
        if (videoTracks.isNull() || videoTracks.isUndefined()) {
            return;
        }
        emscripten::val videoSettings = videoTracks[0].call<emscripten::val>("getSettings");
        float pixelRatio = emscripten::val::global("window")["devicePixelRatio"].as<float>();
 
        if (!videoSettings.isNull() || !videoSettings.isUndefined()) {
            // double fRate = videoSettings["frameRate"].as<double>(); TODO
            int width = static_cast<int>(videoSettings["width"].as<int>() / pixelRatio);
            int height = static_cast<int>(videoSettings["height"].as<int>() / pixelRatio);
 
            QSize initialSize(width, height);
            QRect initialRect(QPoint(0, 0),initialSize);
 
            m_videoOutput->updateVideoElementGeometry(initialRect);
        }
 
        emscripten::val videoElement = m_videoOutput->currentVideoElement();
        if (videoElement.isUndefined()) {
            qWarning() << "Could not find video element";
            return;
        }
        videoElement.set("srcObject", stream);
        m_videoOutput->start();
    }
}
 
void QWasmScreenCapture::setVideoOutput(QWasmVideoOutput *object)
{
    if (object)
        m_videoOutput = object;
}
 
QT_END_NAMESPACE