mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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9d14ae4740
Especially considering some dynamic pipeline scenarios. Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-good/-/merge_requests/822>
545 lines
17 KiB
C++
545 lines
17 KiB
C++
/*
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* GStreamer
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* Copyright (C) 2015 Matthew Waters <matthew@centricular.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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/**
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* SECTION:gstqtsink
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*
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* qmlglsink provides a way to render a video stream as a Qml object inside
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* the Qml scene graph. This is achieved by providing the incoming OpenGL
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* textures to Qt as a scene graph object.
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*
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* qmlglsink will attempt to retrieve the windowing system display connection
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* that Qt is using (#GstGLDisplay). This may be different to any already
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* existing window system display connection already in use in the pipeline for
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* a number of reasons. A couple of examples of this are:
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*
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* 1. Adding qmlglsink to an already running pipeline
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* 2. Not having any qmlglsink (or qmlgloverlay) element start up before any
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* other OpenGL-based element in the pipeline.
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*
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* If one of these scenarios occurs, then there will be multiple OpenGL contexts
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* in use in the pipeline. This means that either the pipeline will fail to
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* start up correctly, a downstream element may reject buffers, or a complete
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* GPU->System memory->GPU transfer is performed for every buffer.
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*
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* The requirement to avoid this is that all elements share the same
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* #GstGLDisplay object and as Qt cannot currently share an existing window
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* system display connection, GStreamer must use the window system display
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* connection provided by Qt. This window system display connection can be
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* retrieved by either a qmlglsink element or a qmlgloverlay element. The
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* recommended usage is to have either element (qmlglsink or qmlgloverlay)
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* be the first to propagate the #GstGLDisplay for the entire pipeline to use by
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* setting either element to the READY element state before any other OpenGL
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* element in the pipeline.
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*
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* In a dynamically adding qmlglsink (or qmlgloverlay) to a pipeline case,
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* there are some considerations for ensuring that the window system display
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* and OpenGL contexts are compatible with Qt. When the qmlgloverlay (or
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* qmlglsink) element is added and brought up to READY, it will propagate it's
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* own #GstGLDisplay using the #GstContext mechanism regardless of any existing
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* #GstGLDisplay used by the pipeline previously. In order for the new
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* #GstGLDisplay to be used, the application must then set the provided
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* #GstGLDisplay containing #GstContext on the pipeline. This may effectively
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* cause each OpenGL element to replace the window system display and also the
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* OpenGL context it is using. As such this process may take a significant
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* amount of time and resources as objects are recreated in the new OpenGL
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* context.
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*
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* All instances of qmlglsink and qmlgloverlay will return the exact same
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* #GstGLDisplay object while the pipeline is running regardless of whether
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* any qmlglsink or qmlgloverlay elements are added or removed from the
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* pipeline.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "gstqtsink.h"
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#include <QtGui/QGuiApplication>
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#include <gst/gl/gstglfuncs.h>
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#define GST_CAT_DEFAULT gst_debug_qt_gl_sink
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GST_DEBUG_CATEGORY (GST_CAT_DEFAULT);
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static void gst_qt_sink_finalize (GObject * object);
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static void gst_qt_sink_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * param_spec);
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static void gst_qt_sink_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * param_spec);
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static gboolean gst_qt_sink_stop (GstBaseSink * bsink);
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static gboolean gst_qt_sink_query (GstBaseSink * bsink, GstQuery * query);
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static GstStateChangeReturn
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gst_qt_sink_change_state (GstElement * element, GstStateChange transition);
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static void gst_qt_sink_get_times (GstBaseSink * bsink, GstBuffer * buf,
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GstClockTime * start, GstClockTime * end);
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static gboolean gst_qt_sink_set_caps (GstBaseSink * bsink, GstCaps * caps);
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static GstFlowReturn gst_qt_sink_show_frame (GstVideoSink * bsink,
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GstBuffer * buf);
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static gboolean gst_qt_sink_propose_allocation (GstBaseSink * bsink,
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GstQuery * query);
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static GstStaticPadTemplate gst_qt_sink_template =
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GST_STATIC_PAD_TEMPLATE ("sink",
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GST_PAD_SINK,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS ("video/x-raw(" GST_CAPS_FEATURE_MEMORY_GL_MEMORY "), "
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"format = (string) RGBA, "
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"width = " GST_VIDEO_SIZE_RANGE ", "
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"height = " GST_VIDEO_SIZE_RANGE ", "
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"framerate = " GST_VIDEO_FPS_RANGE ", "
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"texture-target = (string) 2D"));
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#define DEFAULT_FORCE_ASPECT_RATIO TRUE
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#define DEFAULT_PAR_N 0
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#define DEFAULT_PAR_D 1
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enum
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{
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ARG_0,
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PROP_WIDGET,
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PROP_FORCE_ASPECT_RATIO,
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PROP_PIXEL_ASPECT_RATIO,
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};
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enum
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{
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SIGNAL_0,
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LAST_SIGNAL
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};
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#define gst_qt_sink_parent_class parent_class
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G_DEFINE_TYPE_WITH_CODE (GstQtSink, gst_qt_sink,
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GST_TYPE_VIDEO_SINK, GST_DEBUG_CATEGORY_INIT (GST_CAT_DEFAULT,
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"qtsink", 0, "Qt Video Sink"));
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static void
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gst_qt_sink_class_init (GstQtSinkClass * klass)
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{
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GObjectClass *gobject_class;
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GstElementClass *gstelement_class;
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GstBaseSinkClass *gstbasesink_class;
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GstVideoSinkClass *gstvideosink_class;
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gobject_class = (GObjectClass *) klass;
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gstelement_class = (GstElementClass *) klass;
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gstbasesink_class = (GstBaseSinkClass *) klass;
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gstvideosink_class = (GstVideoSinkClass *) klass;
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gobject_class->set_property = gst_qt_sink_set_property;
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gobject_class->get_property = gst_qt_sink_get_property;
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gst_element_class_set_metadata (gstelement_class, "Qt Video Sink",
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"Sink/Video", "A video sink that renders to a QQuickItem",
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"Matthew Waters <matthew@centricular.com>");
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g_object_class_install_property (gobject_class, PROP_WIDGET,
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g_param_spec_pointer ("widget", "QQuickItem",
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"The QQuickItem to place in the object hierarchy",
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(GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)));
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g_object_class_install_property (gobject_class, PROP_FORCE_ASPECT_RATIO,
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g_param_spec_boolean ("force-aspect-ratio",
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"Force aspect ratio",
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"When enabled, scaling will respect original aspect ratio",
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DEFAULT_FORCE_ASPECT_RATIO,
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(GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)));
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g_object_class_install_property (gobject_class, PROP_PIXEL_ASPECT_RATIO,
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gst_param_spec_fraction ("pixel-aspect-ratio", "Pixel Aspect Ratio",
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"The pixel aspect ratio of the device", DEFAULT_PAR_N, DEFAULT_PAR_D,
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G_MAXINT, 1, 1, 1,
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(GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)));
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gst_element_class_add_static_pad_template (gstelement_class, &gst_qt_sink_template);
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gobject_class->finalize = gst_qt_sink_finalize;
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gstelement_class->change_state = gst_qt_sink_change_state;
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gstbasesink_class->query = gst_qt_sink_query;
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gstbasesink_class->set_caps = gst_qt_sink_set_caps;
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gstbasesink_class->get_times = gst_qt_sink_get_times;
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gstbasesink_class->propose_allocation = gst_qt_sink_propose_allocation;
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gstbasesink_class->stop = gst_qt_sink_stop;
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gstvideosink_class->show_frame = gst_qt_sink_show_frame;
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}
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static void
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gst_qt_sink_init (GstQtSink * qt_sink)
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{
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qt_sink->widget = QSharedPointer<QtGLVideoItemInterface>();
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}
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static void
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gst_qt_sink_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec)
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{
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GstQtSink *qt_sink = GST_QT_SINK (object);
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switch (prop_id) {
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case PROP_WIDGET: {
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QtGLVideoItem *qt_item = static_cast<QtGLVideoItem *> (g_value_get_pointer (value));
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if (qt_item)
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qt_sink->widget = qt_item->getInterface();
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else
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qt_sink->widget.clear();
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break;
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}
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case PROP_FORCE_ASPECT_RATIO:
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g_return_if_fail (qt_sink->widget);
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qt_sink->widget->setForceAspectRatio (g_value_get_boolean (value));
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break;
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case PROP_PIXEL_ASPECT_RATIO:
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g_return_if_fail (qt_sink->widget);
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qt_sink->widget->setDAR (gst_value_get_fraction_numerator (value),
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gst_value_get_fraction_denominator (value));
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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_reset (GstQtSink * qt_sink)
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{
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if (qt_sink->display) {
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gst_object_unref (qt_sink->display);
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qt_sink->display = NULL;
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}
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if (qt_sink->context) {
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gst_object_unref (qt_sink->context);
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qt_sink->context = NULL;
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}
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if (qt_sink->qt_context) {
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gst_object_unref (qt_sink->qt_context);
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qt_sink->qt_context = NULL;
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}
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}
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static void
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gst_qt_sink_finalize (GObject * object)
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{
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GstQtSink *qt_sink = GST_QT_SINK (object);
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_reset (qt_sink);
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qt_sink->widget.clear();
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G_OBJECT_CLASS (parent_class)->finalize (object);
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}
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static void
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gst_qt_sink_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec)
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{
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GstQtSink *qt_sink = GST_QT_SINK (object);
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switch (prop_id) {
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case PROP_WIDGET:
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/* This is not really safe - the app needs to be
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* sure the widget is going to be kept alive or
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* this can crash */
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if (qt_sink->widget)
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g_value_set_pointer (value, qt_sink->widget->videoItem());
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else
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g_value_set_pointer (value, NULL);
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break;
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case PROP_FORCE_ASPECT_RATIO:
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if (qt_sink->widget)
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g_value_set_boolean (value, qt_sink->widget->getForceAspectRatio ());
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else
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g_value_set_boolean (value, DEFAULT_FORCE_ASPECT_RATIO);
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break;
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case PROP_PIXEL_ASPECT_RATIO:
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if (qt_sink->widget) {
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gint num, den;
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qt_sink->widget->getDAR (&num, &den);
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gst_value_set_fraction (value, num, den);
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} else {
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gst_value_set_fraction (value, DEFAULT_PAR_N, DEFAULT_PAR_D);
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}
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static gboolean
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gst_qt_sink_query (GstBaseSink * bsink, GstQuery * query)
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{
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GstQtSink *qt_sink = GST_QT_SINK (bsink);
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gboolean res = FALSE;
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switch (GST_QUERY_TYPE (query)) {
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case GST_QUERY_CONTEXT:
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{
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if (gst_gl_handle_context_query ((GstElement *) qt_sink, query,
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qt_sink->display, qt_sink->context, qt_sink->qt_context))
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return TRUE;
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/* fallthrough */
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}
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default:
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res = GST_BASE_SINK_CLASS (parent_class)->query (bsink, query);
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break;
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}
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return res;
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}
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static gboolean
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gst_qt_sink_stop (GstBaseSink * bsink)
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{
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return TRUE;
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}
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static GstStateChangeReturn
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gst_qt_sink_change_state (GstElement * element, GstStateChange transition)
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{
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GstQtSink *qt_sink = GST_QT_SINK (element);
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GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
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QGuiApplication *app;
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GST_DEBUG ("changing state: %s => %s",
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gst_element_state_get_name (GST_STATE_TRANSITION_CURRENT (transition)),
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gst_element_state_get_name (GST_STATE_TRANSITION_NEXT (transition)));
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switch (transition) {
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case GST_STATE_CHANGE_NULL_TO_READY:
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app = static_cast<QGuiApplication *> (QCoreApplication::instance ());
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if (!app) {
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GST_ELEMENT_ERROR (element, RESOURCE, NOT_FOUND,
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("%s", "Failed to connect to Qt"),
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("%s", "Could not retrieve QGuiApplication instance"));
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return GST_STATE_CHANGE_FAILURE;
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}
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if (!qt_sink->widget) {
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GST_ELEMENT_ERROR (element, RESOURCE, NOT_FOUND,
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("%s", "Required property \'widget\' not set"),
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(NULL));
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return GST_STATE_CHANGE_FAILURE;
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}
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if (!qt_sink->widget->initWinSys()) {
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GST_ELEMENT_ERROR (element, RESOURCE, NOT_FOUND,
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("%s", "Could not initialize window system"),
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(NULL));
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return GST_STATE_CHANGE_FAILURE;
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}
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qt_sink->display = qt_sink->widget->getDisplay();
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qt_sink->context = qt_sink->widget->getContext();
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qt_sink->qt_context = qt_sink->widget->getQtContext();
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if (!qt_sink->display || !qt_sink->context || !qt_sink->qt_context) {
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GST_ELEMENT_ERROR (element, RESOURCE, NOT_FOUND,
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("%s", "Could not retrieve window system OpenGL configuration"),
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(NULL));
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return GST_STATE_CHANGE_FAILURE;
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}
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GST_OBJECT_LOCK (qt_sink->display);
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gst_gl_display_add_context (qt_sink->display, qt_sink->context);
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GST_OBJECT_UNLOCK (qt_sink->display);
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gst_gl_element_propagate_display_context (GST_ELEMENT (qt_sink), qt_sink->display);
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break;
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case GST_STATE_CHANGE_READY_TO_PAUSED:
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break;
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case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
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break;
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default:
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break;
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}
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ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
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if (ret == GST_STATE_CHANGE_FAILURE)
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return ret;
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switch (transition) {
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case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
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break;
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case GST_STATE_CHANGE_PAUSED_TO_READY:
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if (qt_sink->widget)
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qt_sink->widget->setBuffer(NULL);
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break;
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case GST_STATE_CHANGE_READY_TO_NULL:
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break;
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default:
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break;
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}
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return ret;
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}
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static void
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gst_qt_sink_get_times (GstBaseSink * bsink, GstBuffer * buf,
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GstClockTime * start, GstClockTime * end)
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{
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GstQtSink *qt_sink;
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qt_sink = GST_QT_SINK (bsink);
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if (GST_BUFFER_TIMESTAMP_IS_VALID (buf)) {
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*start = GST_BUFFER_TIMESTAMP (buf);
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if (GST_BUFFER_DURATION_IS_VALID (buf))
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*end = *start + GST_BUFFER_DURATION (buf);
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else {
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if (GST_VIDEO_INFO_FPS_N (&qt_sink->v_info) > 0) {
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*end = *start +
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gst_util_uint64_scale_int (GST_SECOND,
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GST_VIDEO_INFO_FPS_D (&qt_sink->v_info),
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GST_VIDEO_INFO_FPS_N (&qt_sink->v_info));
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}
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}
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}
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}
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gboolean
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gst_qt_sink_set_caps (GstBaseSink * bsink, GstCaps * caps)
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{
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GstQtSink *qt_sink = GST_QT_SINK (bsink);
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GST_DEBUG ("set caps with %" GST_PTR_FORMAT, caps);
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if (!gst_video_info_from_caps (&qt_sink->v_info, caps))
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return FALSE;
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if (!qt_sink->widget)
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return FALSE;
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return qt_sink->widget->setCaps(caps);
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}
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static GstFlowReturn
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gst_qt_sink_show_frame (GstVideoSink * vsink, GstBuffer * buf)
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{
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GstQtSink *qt_sink;
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GST_TRACE ("rendering buffer:%p", buf);
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qt_sink = GST_QT_SINK (vsink);
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if (qt_sink->widget)
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qt_sink->widget->setBuffer(buf);
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return GST_FLOW_OK;
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}
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static gboolean
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gst_qt_sink_propose_allocation (GstBaseSink * bsink, GstQuery * query)
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{
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GstQtSink *qt_sink = GST_QT_SINK (bsink);
|
|
GstBufferPool *pool;
|
|
GstStructure *config;
|
|
GstCaps *caps;
|
|
guint size;
|
|
gboolean need_pool;
|
|
|
|
if (!qt_sink->display || !qt_sink->context)
|
|
return FALSE;
|
|
|
|
gst_query_parse_allocation (query, &caps, &need_pool);
|
|
|
|
if (caps == NULL)
|
|
goto no_caps;
|
|
|
|
/* FIXME re-using buffer pool breaks renegotiation */
|
|
if ((pool = qt_sink->pool))
|
|
gst_object_ref (pool);
|
|
|
|
if (pool != NULL) {
|
|
GstCaps *pcaps;
|
|
|
|
/* we had a pool, check caps */
|
|
GST_DEBUG_OBJECT (qt_sink, "check existing pool caps");
|
|
config = gst_buffer_pool_get_config (pool);
|
|
gst_buffer_pool_config_get_params (config, &pcaps, &size, NULL, NULL);
|
|
|
|
if (!gst_caps_is_equal (caps, pcaps)) {
|
|
GST_DEBUG_OBJECT (qt_sink, "pool has different caps");
|
|
/* different caps, we can't use this pool */
|
|
gst_object_unref (pool);
|
|
pool = NULL;
|
|
}
|
|
gst_structure_free (config);
|
|
} else {
|
|
GstVideoInfo info;
|
|
|
|
if (!gst_video_info_from_caps (&info, caps))
|
|
goto invalid_caps;
|
|
|
|
/* the normal size of a frame */
|
|
size = info.size;
|
|
}
|
|
|
|
if (pool == NULL && need_pool) {
|
|
|
|
GST_DEBUG_OBJECT (qt_sink, "create new pool");
|
|
pool = gst_gl_buffer_pool_new (qt_sink->context);
|
|
|
|
config = gst_buffer_pool_get_config (pool);
|
|
gst_buffer_pool_config_set_params (config, caps, size, 0, 0);
|
|
if (!gst_buffer_pool_set_config (pool, config))
|
|
goto config_failed;
|
|
}
|
|
|
|
/* we need at least 2 buffer because we hold on to the last one */
|
|
gst_query_add_allocation_pool (query, pool, size, 2, 0);
|
|
if (pool)
|
|
gst_object_unref (pool);
|
|
|
|
/* we also support various metadata */
|
|
gst_query_add_allocation_meta (query, GST_VIDEO_META_API_TYPE, 0);
|
|
|
|
if (qt_sink->context->gl_vtable->FenceSync)
|
|
gst_query_add_allocation_meta (query, GST_GL_SYNC_META_API_TYPE, 0);
|
|
|
|
return TRUE;
|
|
|
|
/* ERRORS */
|
|
no_caps:
|
|
{
|
|
GST_DEBUG_OBJECT (bsink, "no caps specified");
|
|
return FALSE;
|
|
}
|
|
invalid_caps:
|
|
{
|
|
GST_DEBUG_OBJECT (bsink, "invalid caps specified");
|
|
return FALSE;
|
|
}
|
|
config_failed:
|
|
{
|
|
GST_DEBUG_OBJECT (bsink, "failed setting config");
|
|
return FALSE;
|
|
}
|
|
}
|