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// Copyright (C) 2021 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 <qgstreamervideooutput_p.h>
#include <qgstreamervideosink_p.h>
#include <qgstsubtitlesink_p.h>
#include <qvideosink.h>
#include <QtCore/qloggingcategory.h>
#include <qthread.h>
Q_LOGGING_CATEGORY(qLcMediaVideoOutput, "qt.multimedia.videooutput")
QT_BEGIN_NAMESPACE
QGstreamerVideoOutput::QGstreamerVideoOutput(QObject *parent)
: QObject(parent),
gstVideoOutput("videoOutput")
{
videoQueue = QGstElement("queue", "videoQueue");
videoConvert = QGstElement("videoconvert", "videoConvert");
videoSink = QGstElement("fakesink", "fakeVideoSink");
videoSink.set("sync", true);
gstVideoOutput.add(videoQueue, videoConvert, videoSink);
if (!videoQueue.link(videoConvert, videoSink))
qCDebug(qLcMediaVideoOutput) << ">>>>>> linking failed";
gstVideoOutput.addGhostPad(videoQueue, "sink");
}
QGstreamerVideoOutput::~QGstreamerVideoOutput()
{
gstVideoOutput.setStateSync(GST_STATE_NULL);
}
void QGstreamerVideoOutput::setVideoSink(QVideoSink *sink)
{
auto *gstVideoSink = sink ? static_cast<QGstreamerVideoSink *>(sink->platformVideoSink()) : nullptr;
if (gstVideoSink == m_videoSink)
return;
if (m_videoSink)
m_videoSink->setPipeline({});
m_videoSink = gstVideoSink;
if (m_videoSink)
m_videoSink->setPipeline(gstPipeline);
QGstElement gstSink;
if (m_videoSink) {
gstSink = m_videoSink->gstSink();
isFakeSink = false;
} else {
gstSink = QGstElement("fakesink", "fakevideosink");
gstSink.set("sync", true);
isFakeSink = true;
}
if (videoSink == gstSink)
return;
gstPipeline.beginConfig();
if (!videoSink.isNull()) {
gstVideoOutput.remove(videoSink);
videoSink.setStateSync(GST_STATE_NULL);
}
videoSink = gstSink;
gstVideoOutput.add(videoSink);
videoConvert.link(videoSink);
GstEvent *event = gst_event_new_reconfigure();
gst_element_send_event(videoSink.element(), event);
videoSink.syncStateWithParent();
doLinkSubtitleStream();
gstPipeline.endConfig();
qCDebug(qLcMediaVideoOutput) << "sinkChanged" << gstSink.name();
GST_DEBUG_BIN_TO_DOT_FILE(gstPipeline.bin(),
GstDebugGraphDetails(/*GST_DEBUG_GRAPH_SHOW_ALL |*/ GST_DEBUG_GRAPH_SHOW_MEDIA_TYPE |
GST_DEBUG_GRAPH_SHOW_NON_DEFAULT_PARAMS | GST_DEBUG_GRAPH_SHOW_STATES),
videoSink.name());
}
void QGstreamerVideoOutput::setPipeline(const QGstPipeline &pipeline)
{
gstPipeline = pipeline;
if (m_videoSink)
m_videoSink->setPipeline(gstPipeline);
}
void QGstreamerVideoOutput::linkSubtitleStream(QGstElement src)
{
qCDebug(qLcMediaVideoOutput) << "link subtitle stream" << src.isNull();
if (src == subtitleSrc)
return;
gstPipeline.beginConfig();
subtitleSrc = src;
doLinkSubtitleStream();
gstPipeline.endConfig();
}
void QGstreamerVideoOutput::unlinkSubtitleStream()
{
if (subtitleSrc.isNull())
return;
qCDebug(qLcMediaVideoOutput) << "unlink subtitle stream";
subtitleSrc = {};
if (!subtitleSink.isNull()) {
gstPipeline.beginConfig();
gstPipeline.remove(subtitleSink);
gstPipeline.endConfig();
subtitleSink.setStateSync(GST_STATE_NULL);
subtitleSink = {};
}
if (m_videoSink)
m_videoSink->setSubtitleText({});
}
void QGstreamerVideoOutput::doLinkSubtitleStream()
{
if (!subtitleSink.isNull()) {
gstPipeline.remove(subtitleSink);
subtitleSink.setStateSync(GST_STATE_NULL);
subtitleSink = {};
}
if (!m_videoSink || subtitleSrc.isNull())
return;
if (subtitleSink.isNull()) {
subtitleSink = m_videoSink->subtitleSink();
gstPipeline.add(subtitleSink);
}
if (!subtitleSrc.link(subtitleSink))
qCDebug(qLcMediaVideoOutput) << "link subtitle stream failed";
}
void QGstreamerVideoOutput::setIsPreview()
{
// configures the queue to be fast and lightweight for camera preview
// also avoids blocking the queue in case we have an encodebin attached to the tee as well
videoQueue.set("leaky", 2 /*downstream*/);
videoQueue.set("silent", true);
videoQueue.set("max-size-buffers", uint(1));
videoQueue.set("max-size-bytes", uint(0));
videoQueue.set("max-size-time", quint64(0));
}
void QGstreamerVideoOutput::flushSubtitles()
{
if (!subtitleSink.isNull()) {
auto pad = subtitleSink.staticPad("sink");
auto *event = gst_event_new_flush_start();
pad.sendEvent(event);
event = gst_event_new_flush_stop(false);
pad.sendEvent(event);
}
}
QT_END_NAMESPACE
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