gstreamer/gst/camerabin2/gstviewfinderbin.c

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/* GStreamer
* Copyright (C) 2010 Thiago Santos <thiago.sousa.santos@collabora.co.uk>
*
* 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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/**
* SECTION:element-gstviewfinderbin
*
* The gstviewfinderbin element is a displaying element for camerabin2.
*
* <refsect2>
* <title>Example launch line</title>
* |[
* gst-launch -v videotestsrc ! viewfinderbin
* ]|
* Feeds the viewfinderbin with video test data.
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstviewfinderbin.h"
#include "camerabingeneral.h"
#include <gst/pbutils/pbutils.h>
#include <gst/gst-i18n-plugin.h>
GST_DEBUG_CATEGORY_STATIC (gst_viewfinder_bin_debug);
#define GST_CAT_DEFAULT gst_viewfinder_bin_debug
/* prototypes */
enum
{
PROP_0,
PROP_VIDEO_SINK,
};
/* pad templates */
static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-raw-yuv; video/x-raw-rgb")
);
/* class initialization */
GST_BOILERPLATE (GstViewfinderBin, gst_viewfinder_bin, GstBin, 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_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&sink_template));
gst_element_class_set_details_simple (element_class, "Viewfinder Bin",
"Sink/Video", "Viewfinder Bin used in camerabin2",
"Thiago Santos <thiago.sousa.santos@collabora.co.uk>");
}
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));
}
static void
gst_viewfinder_bin_init (GstViewfinderBin * viewfinderbin,
GstViewfinderBinClass * viewfinderbin_class)
{
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);
}
static gboolean
gst_viewfinder_bin_create_elements (GstViewfinderBin * vfbin)
{
GstElement *csp = NULL;
GstElement *videoscale = NULL;
GstPad *pad = NULL;
const gchar *missing_element_name;
GST_DEBUG_OBJECT (vfbin, "Creating internal elements");
if (!vfbin->elements_created) {
/* create elements */
csp =
gst_camerabin_create_and_add_element (GST_BIN (vfbin),
"ffmpegcolorspace", "vfbin-csp");
if (!csp) {
missing_element_name = "ffmpegcolorspace";
goto missing_element;
}
videoscale =
gst_camerabin_create_and_add_element (GST_BIN (vfbin), "videoscale",
"vfbin-videoscale");
if (!videoscale) {
missing_element_name = "videoscale";
goto missing_element;
}
/* add ghostpad */
pad = gst_element_get_static_pad (csp, "sink");
if (!gst_ghost_pad_set_target (GST_GHOST_PAD (vfbin->ghostpad), pad))
goto error;
gst_object_unref (pad);
pad = NULL;
vfbin->elements_created = TRUE;
GST_DEBUG_OBJECT (vfbin, "Elements succesfully created and linked");
}
if (vfbin->video_sink) {
/* check if we need to replace the current one */
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));
if (!videoscale)
videoscale = gst_bin_get_by_name (GST_BIN_CAST (vfbin),
"vfbin-videoscale");
if (!gst_element_link_pads (videoscale, "src", vfbin->video_sink, "sink")) {
GST_ELEMENT_ERROR (vfbin, CORE, NEGOTIATION, (NULL),
("linking videoscale and viewfindersink failed"));
}
/* prevent it from being removed from the bin at this point */
videoscale = 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 (pad)
gst_object_unref (pad);
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;
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;
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 ());
}