gstqtglvideosink.cpp 6.15 KB
Newer Older
Gus Grubba's avatar
Gus Grubba committed
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
/*
    Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies). <qt-info@nokia.com>
    Copyright (C) 2011-2012 Collabora Ltd. <info@collabora.com>

    This library is free software; you can redistribute it and/or modify
    it under the terms of the GNU Lesser General Public License version 2.1
    as published by the Free Software Foundation.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

/**
 * @file
 *   @brief Extracted from QtGstreamer to avoid overly complex dependency
 *   @author Gus Grubba <mavlink@grubba.com>
 */

24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40
/*
 * Note on the marshallers
 *
 * If it ever needs to be recreated, here is what you need to do:
 *
 * cat > marshaller.src
 * VOID:POINTER,FLOAT,FLOAT,FLOAT,FLOAT
 * VOID:POINTER,DOUBLE,DOUBLE,DOUBLE,DOUBLE
 * POINTER:POINTER,FLOAT,FLOAT,FLOAT,FLOAT
 * POINTER:POINTER,DOUBLE,DOUBLE,DOUBLE,DOUBLE
 * Ctrl+D (EOF)
 *
 * glib-genmarshal --header marshaller.list > gstqtvideosinkmarshal.h
 * glib-genmarshal --body marshaller.list > gstqtvideosinkmarshal.c
 *
 */

Gus Grubba's avatar
Gus Grubba committed
41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167
#include "gstqtglvideosink.h"
#include "gstqtvideosinkmarshal.h"
#include "delegates/qtvideosinkdelegate.h"


guint GstQtGLVideoSink::s_signals[];

DEFINE_TYPE(GstQtGLVideoSink, GST_TYPE_QT_GL_VIDEO_SINK_BASE)

//------------------------------

void GstQtGLVideoSink::emit_update(gpointer sink)
{
    g_signal_emit(sink, GstQtGLVideoSink::s_signals[UPDATE_SIGNAL], 0, NULL);
}

//------------------------------

void GstQtGLVideoSink::base_init(gpointer g_class)
{
    GstElementClass *element_class = GST_ELEMENT_CLASS(g_class);

    gst_element_class_set_details_simple(element_class, "Qt GL video sink", "Sink/Video",
        "A video sink that can draw on any Qt GL surface",
        "George Kiagiadakis <george.kiagiadakis@collabora.com>");
}

void GstQtGLVideoSink::class_init(gpointer g_class, gpointer class_data)
{
    Q_UNUSED(class_data);

    GObjectClass *object_class = G_OBJECT_CLASS(g_class);
    object_class->set_property = GstQtGLVideoSink::set_property;

    GstQtGLVideoSinkClass *qt_video_sink_class = reinterpret_cast<GstQtGLVideoSinkClass*>(g_class);
    qt_video_sink_class->paint = GstQtGLVideoSink::paint;

    /**
     * GstQtGLVideoSink::paint
     * @painter: A valid QPainter pointer that will be used to paint the video
     * @x: The x coordinate of the target area rectangle
     * @y: The y coordinate of the target area rectangle
     * @width: The width of the target area rectangle
     * @height: The height of the target area rectangle
     *
     * This is an action signal that you can call from your Qt surface class inside
     * its paint function to render the video. It takes a QPainter* and the target
     * area rectangle as arguments. You should schedule to call this function to
     * repaint the surface whenever the ::update signal is emited.
     *
     * Note that the x,y,width and height arguments are actually qreal. This means
     * that on architectures like arm they will be float instead of double. You should
     * cast the arguments to qreal if they are not already when emitting this signal.
     */

    s_signals[PAINT_SIGNAL] =
        g_signal_new("paint", G_TYPE_FROM_CLASS(g_class),
                     static_cast<GSignalFlags>(G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION),
                     G_STRUCT_OFFSET(GstQtGLVideoSinkClass, paint),
                     NULL, NULL,
                     qRealIsDouble() ?
                        g_cclosure_user_marshal_VOID__POINTER_DOUBLE_DOUBLE_DOUBLE_DOUBLE :
                        g_cclosure_user_marshal_VOID__POINTER_FLOAT_FLOAT_FLOAT_FLOAT,
                     G_TYPE_NONE, 5,
                     G_TYPE_POINTER, G_TYPE_QREAL, G_TYPE_QREAL, G_TYPE_QREAL, G_TYPE_QREAL);

    /**
     * GstQtGLVideoSink::update
     *
     * This signal is emited when the surface should be repainted. It should
     * be connected to QWidget::update() or QGraphicsItem::update() or any
     * other similar function in your surface.
     */
    s_signals[UPDATE_SIGNAL] =
        g_signal_new("update", G_TYPE_FROM_CLASS(g_class),
                     G_SIGNAL_RUN_LAST,
                     0, NULL, NULL,
                     g_cclosure_marshal_VOID__VOID,
                     G_TYPE_NONE, 0);


    /**
     * GstQtGLVideoSink::glcontext
     *
     * This property holds a pointer to the QGLContext that will be used to render
     * the video using OpenGL acceleration. You must set this to a valid QGLContext
     * pointer before the element changes state to READY, or else the state change will fail.
     **/
    g_object_class_install_property(object_class, PROP_GLCONTEXT,
        g_param_spec_pointer("glcontext", "GL context",
                             "The QGLContext that will be used to do OpenGL-accelerated rendering",
                             static_cast<GParamFlags>(G_PARAM_WRITABLE)));
}

void GstQtGLVideoSink::init(GTypeInstance *instance, gpointer g_class)
{
    Q_UNUSED(g_class);

    GstQtVideoSinkBase *sinkBase = GST_QT_VIDEO_SINK_BASE(instance);
    sinkBase->delegate = new QtVideoSinkDelegate(GST_ELEMENT(sinkBase));
}

//------------------------------

void GstQtGLVideoSink::set_property(GObject *object, guint prop_id,
                                     const GValue *value, GParamSpec *pspec)
{
    GstQtVideoSinkBase *sinkBase = GST_QT_VIDEO_SINK_BASE(object);

    switch (prop_id) {
    case PROP_GLCONTEXT:
        sinkBase->delegate->setGLContext(static_cast<QGLContext*>(g_value_get_pointer(value)));
        break;
    default:
        G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec);
        break;
    }
}

//------------------------------

void GstQtGLVideoSink::paint(GstQtGLVideoSink *sink, gpointer painter,
                           qreal x, qreal y, qreal width, qreal height)
{
    GST_QT_VIDEO_SINK_BASE(sink)->delegate->paint(static_cast<QPainter*>(painter),
                                                  QRectF(x, y, width, height));
}