C++ (Cpp) gst_caps_is_writable Examples

Example #1

File: OpenIMAJ_GStreamer.cpp Project: Garfield2005/openimaj

/*!
 * \brief OpenIMAJCapGStreamer::setFilter
 * \param prop the property name
 * \param type glib property type
 * \param v1 the value
 * \param v2 second value of property type requires it, else NULL
 * Filter the output formats by setting appsink caps properties
 */
void OpenIMAJCapGStreamer::setFilter(const char *prop, GType type, int v1, int v2)
{
    if(!caps || !( GST_IS_CAPS (caps) ))
    {
        if(type == G_TYPE_INT)
        {
            caps = gst_caps_new_simple("video/x-raw","format",G_TYPE_STRING,"BGR", prop, type, v1, NULL);
        }
        else
        {
            caps = gst_caps_new_simple("video/x-raw","format",G_TYPE_STRING,"BGR", prop, type, v1, v2, NULL);
        }
    }
    else
    {
        if (! gst_caps_is_writable(caps))
            caps = gst_caps_make_writable (caps);
        if(type == G_TYPE_INT){
            gst_caps_set_simple(caps, prop, type, v1, NULL);
        }else{
            gst_caps_set_simple(caps, prop, type, v1, v2, NULL);
        }
    }
    
    caps = gst_caps_fixate(caps);
    
    gst_app_sink_set_caps(GST_APP_SINK(sink), caps);
}

Example #2

File: OpenIMAJ_GStreamer.cpp Project: Garfield2005/openimaj

/*!
 * \brief OpenIMAJCapGStreamer::removeFilter
 * \param filter filter to remove
 * remove the specified filter from the appsink template caps
 */
void OpenIMAJCapGStreamer::removeFilter(const char *filter)
{
    if(!caps)
        return;
    
    if (! gst_caps_is_writable(caps))
        caps = gst_caps_make_writable (caps);
    
    GstStructure *s = gst_caps_get_structure(caps, 0);
    gst_structure_remove_field(s, filter);
    
    gst_app_sink_set_caps(GST_APP_SINK(sink), caps);
}

Example #3

File: cap_gstreamer.cpp Project: KristofWyffels/opencv

/*!
 * \brief CvCapture_GStreamer::removeFilter
 * \param filter filter to remove
 * remove the specified filter from the appsink template caps
 */
void CvCapture_GStreamer::removeFilter(const char *filter)
{
    if(!caps)
        return;

#if GST_VERSION_MAJOR > 0
    if (! gst_caps_is_writable(caps))
        caps = gst_caps_make_writable (caps);
#endif

    GstStructure *s = gst_caps_get_structure(caps, 0);
    gst_structure_remove_field(s, filter);

    gst_app_sink_set_caps(GST_APP_SINK(sink), caps);
}

Example #4

File: cap_gstreamer.cpp Project: KristofWyffels/opencv

/*!
 * \brief CvCapture_GStreamer::setFilter
 * \param prop the property name
 * \param type glib property type
 * \param v1 the value
 * \param v2 second value of property type requires it, else NULL
 * Filter the output formats by setting appsink caps properties
 */
void CvCapture_GStreamer::setFilter(const char *prop, int type, int v1, int v2)
{
    //printf("GStreamer: setFilter \n");
    if(!caps || !( GST_IS_CAPS (caps) ))
    {
        if(type == G_TYPE_INT)
        {
#if GST_VERSION_MAJOR == 0
            caps = gst_caps_new_simple("video/x-raw-rgb", prop, type, v1, NULL);
#else
            caps = gst_caps_new_simple("video/x-raw","format",G_TYPE_STRING,"BGR", prop, type, v1, NULL);
#endif
        }
        else
        {
#if GST_VERSION_MAJOR == 0
            caps = gst_caps_new_simple("video/x-raw-rgb", prop, type, v1, v2, NULL);
#else
            caps = gst_caps_new_simple("video/x-raw","format",G_TYPE_STRING,"BGR", prop, type, v1, v2, NULL);
#endif
        }
    }
    else
    {
#if GST_VERSION_MAJOR > 0
        if (! gst_caps_is_writable(caps))
            caps = gst_caps_make_writable (caps);
#endif
        if(type == G_TYPE_INT){
            gst_caps_set_simple(caps, prop, type, v1, NULL);
        }else{
            gst_caps_set_simple(caps, prop, type, v1, v2, NULL);
        }
    }

#if GST_VERSION_MAJOR > 0
    caps = gst_caps_fixate(caps);
#endif

    gst_app_sink_set_caps(GST_APP_SINK(sink), caps);
    //printf("filtering with %s\n", gst_caps_to_string(caps));
}