/* GStreamer * Copyright (C) 2010 Thiago Santos * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library 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 * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public * License along with this library; if not, write to the * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, * Boston, MA 02110-1301, USA. */ /** * SECTION:element-gstviewfinderbin * * The gstviewfinderbin element is a displaying element for camerabin2. * * * Example launch line * |[ * gst-launch-1.0 -v videotestsrc ! viewfinderbin * ]| * Feeds the viewfinderbin with video test data. * */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include "gstviewfinderbin.h" #include "camerabingeneral.h" #include #include GST_DEBUG_CATEGORY_STATIC (gst_viewfinder_bin_debug); #define GST_CAT_DEFAULT gst_viewfinder_bin_debug enum { PROP_0, PROP_VIDEO_SINK, PROP_DISABLE_CONVERTERS }; #define DEFAULT_DISABLE_CONVERTERS FALSE /* pad templates */ static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink", GST_PAD_SINK, GST_PAD_ALWAYS, GST_STATIC_CAPS ("video/x-raw(ANY)") ); /* class initialization */ #define gst_viewfinder_bin_parent_class parent_class G_DEFINE_TYPE (GstViewfinderBin, gst_viewfinder_bin, GST_TYPE_BIN); static void gst_viewfinder_bin_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * spec); static void gst_viewfinder_bin_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * spec); static void gst_viewfinder_bin_set_video_sink (GstViewfinderBin * vfbin, GstElement * sink); /* Element class functions */ static GstStateChangeReturn gst_viewfinder_bin_change_state (GstElement * element, GstStateChange trans); static void gst_viewfinder_bin_dispose (GObject * object) { GstViewfinderBin *viewfinderbin = GST_VIEWFINDER_BIN_CAST (object); if (viewfinderbin->user_video_sink) { gst_object_unref (viewfinderbin->user_video_sink); viewfinderbin->user_video_sink = NULL; } if (viewfinderbin->video_sink) { gst_object_unref (viewfinderbin->video_sink); viewfinderbin->video_sink = NULL; } G_OBJECT_CLASS (parent_class)->dispose ((GObject *) viewfinderbin); } static void gst_viewfinder_bin_class_init (GstViewfinderBinClass * klass) { GObjectClass *gobject_klass; GstElementClass *element_class; gobject_klass = (GObjectClass *) klass; element_class = GST_ELEMENT_CLASS (klass); element_class->change_state = GST_DEBUG_FUNCPTR (gst_viewfinder_bin_change_state); gobject_klass->dispose = gst_viewfinder_bin_dispose; gobject_klass->set_property = gst_viewfinder_bin_set_property; gobject_klass->get_property = gst_viewfinder_bin_get_property; g_object_class_install_property (gobject_klass, PROP_VIDEO_SINK, g_param_spec_object ("video-sink", "Video Sink", "the video output element to use (NULL = default)", GST_TYPE_ELEMENT, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_klass, PROP_DISABLE_CONVERTERS, g_param_spec_boolean ("disable-converters", "Disable conversion elements", "If video converters should be disabled (must be set on NULL)", DEFAULT_DISABLE_CONVERTERS, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); gst_element_class_add_pad_template (element_class, gst_static_pad_template_get (&sink_template)); gst_element_class_set_static_metadata (element_class, "Viewfinder Bin", "Sink/Video", "Viewfinder Bin used in camerabin2", "Thiago Santos "); } static void gst_viewfinder_bin_init (GstViewfinderBin * viewfinderbin) { GstPadTemplate *templ = gst_static_pad_template_get (&sink_template); viewfinderbin->ghostpad = gst_ghost_pad_new_no_target_from_template ("sink", templ); gst_object_unref (templ); gst_element_add_pad (GST_ELEMENT_CAST (viewfinderbin), viewfinderbin->ghostpad); viewfinderbin->disable_converters = DEFAULT_DISABLE_CONVERTERS; } static gboolean gst_viewfinder_bin_create_elements (GstViewfinderBin * vfbin) { GstElement *csp = NULL; GstElement *videoscale = NULL; GstPad *firstpad = NULL; const gchar *missing_element_name; gboolean newsink = FALSE; gboolean updated_converters = FALSE; GST_DEBUG_OBJECT (vfbin, "Creating internal elements"); /* First check if we need to add/replace the internal sink */ if (vfbin->video_sink) { if (vfbin->user_video_sink && vfbin->video_sink != vfbin->user_video_sink) { gst_bin_remove (GST_BIN_CAST (vfbin), vfbin->video_sink); gst_object_unref (vfbin->video_sink); vfbin->video_sink = NULL; } } if (!vfbin->video_sink) { if (vfbin->user_video_sink) vfbin->video_sink = gst_object_ref (vfbin->user_video_sink); else { vfbin->video_sink = gst_element_factory_make ("autovideosink", "vfbin-sink"); if (!vfbin->video_sink) { missing_element_name = "autovideosink"; goto missing_element; } } gst_bin_add (GST_BIN_CAST (vfbin), gst_object_ref (vfbin->video_sink)); newsink = TRUE; } /* check if we want add/remove the conversion elements */ if (vfbin->elements_created && vfbin->disable_converters) { /* remove the elements, user doesn't want them */ gst_ghost_pad_set_target (GST_GHOST_PAD (vfbin->ghostpad), NULL); csp = gst_bin_get_by_name (GST_BIN_CAST (vfbin), "vfbin-csp"); videoscale = gst_bin_get_by_name (GST_BIN_CAST (vfbin), "vfbin-videoscale"); gst_bin_remove (GST_BIN_CAST (vfbin), csp); gst_bin_remove (GST_BIN_CAST (vfbin), videoscale); gst_object_unref (csp); gst_object_unref (videoscale); updated_converters = TRUE; } else if (!vfbin->elements_created && !vfbin->disable_converters) { gst_ghost_pad_set_target (GST_GHOST_PAD (vfbin->ghostpad), NULL); /* add the elements, user wants them */ csp = gst_element_factory_make ("videoconvert", "vfbin-csp"); if (!csp) { missing_element_name = "videoconvert"; goto missing_element; } gst_bin_add (GST_BIN_CAST (vfbin), csp); videoscale = gst_element_factory_make ("videoscale", "vfbin->videoscale"); if (!videoscale) { missing_element_name = "videoscale"; goto missing_element; } gst_bin_add (GST_BIN_CAST (vfbin), videoscale); gst_element_link_pads_full (csp, "src", videoscale, "sink", GST_PAD_LINK_CHECK_NOTHING); vfbin->elements_created = TRUE; GST_DEBUG_OBJECT (vfbin, "Elements succesfully created and linked"); updated_converters = TRUE; } /* otherwise, just leave it as is */ /* if sink was replaced -> link it to the internal converters */ if (newsink && !vfbin->disable_converters) { gboolean unref = FALSE; if (!videoscale) { videoscale = gst_bin_get_by_name (GST_BIN_CAST (vfbin), "vfbin-videscale"); unref = TRUE; } if (!gst_element_link_pads_full (videoscale, "src", vfbin->video_sink, "sink", GST_PAD_LINK_CHECK_CAPS)) { GST_ELEMENT_ERROR (vfbin, CORE, NEGOTIATION, (NULL), ("linking videoscale and viewfindersink failed")); } if (unref) gst_object_unref (videoscale); videoscale = NULL; } /* Check if we need a new ghostpad target */ if (updated_converters || (newsink && vfbin->disable_converters)) { if (vfbin->disable_converters) { firstpad = gst_element_get_static_pad (vfbin->video_sink, "sink"); } else { /* csp should always exist at this point */ firstpad = gst_element_get_static_pad (csp, "sink"); } } /* need to change the ghostpad target if firstpad is set */ if (firstpad) { if (!gst_ghost_pad_set_target (GST_GHOST_PAD (vfbin->ghostpad), firstpad)) goto error; gst_object_unref (firstpad); firstpad = NULL; } return TRUE; missing_element: gst_element_post_message (GST_ELEMENT_CAST (vfbin), gst_missing_element_message_new (GST_ELEMENT_CAST (vfbin), missing_element_name)); GST_ELEMENT_ERROR (vfbin, CORE, MISSING_PLUGIN, (_("Missing element '%s' - check your GStreamer installation."), missing_element_name), (NULL)); goto error; error: GST_WARNING_OBJECT (vfbin, "Creating internal elements failed"); if (firstpad) gst_object_unref (firstpad); return FALSE; } static GstStateChangeReturn gst_viewfinder_bin_change_state (GstElement * element, GstStateChange trans) { GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS; GstViewfinderBin *vfbin = GST_VIEWFINDER_BIN_CAST (element); switch (trans) { case GST_STATE_CHANGE_NULL_TO_READY: if (!gst_viewfinder_bin_create_elements (vfbin)) { return GST_STATE_CHANGE_FAILURE; } break; default: break; } ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, trans); switch (trans) { case GST_STATE_CHANGE_READY_TO_NULL: break; default: break; } return ret; } static void gst_viewfinder_bin_set_video_sink (GstViewfinderBin * vfbin, GstElement * sink) { GST_INFO_OBJECT (vfbin, "Setting video sink to %" GST_PTR_FORMAT, sink); if (vfbin->user_video_sink != sink) { if (vfbin->user_video_sink) { gst_object_unref (vfbin->user_video_sink); } vfbin->user_video_sink = sink; if (sink) gst_object_ref (sink); } } static void gst_viewfinder_bin_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec) { GstViewfinderBin *vfbin = GST_VIEWFINDER_BIN_CAST (object); switch (prop_id) { case PROP_VIDEO_SINK: gst_viewfinder_bin_set_video_sink (vfbin, g_value_get_object (value)); break; case PROP_DISABLE_CONVERTERS: vfbin->disable_converters = g_value_get_boolean (value); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void gst_viewfinder_bin_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec) { GstViewfinderBin *vfbin = GST_VIEWFINDER_BIN_CAST (object); switch (prop_id) { case PROP_VIDEO_SINK: g_value_set_object (value, vfbin->video_sink); break; case PROP_DISABLE_CONVERTERS: g_value_set_boolean (value, vfbin->disable_converters); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } gboolean gst_viewfinder_bin_plugin_init (GstPlugin * plugin) { GST_DEBUG_CATEGORY_INIT (gst_viewfinder_bin_debug, "viewfinderbin", 0, "ViewFinderBin"); return gst_element_register (plugin, "viewfinderbin", GST_RANK_NONE, gst_viewfinder_bin_get_type ()); }