/*
* empathy-gst-video-src.c - Source for EmpathyGstVideoSrc
* Copyright (C) 2008 Collabora Ltd.
* @author Sjoerd Simons <sjoerd.simons@collabora.co.uk>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser 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
*/
#include <stdio.h>
#include <stdlib.h>
#include <gst/interfaces/colorbalance.h>
#include "empathy-video-src.h"
G_DEFINE_TYPE(EmpathyGstVideoSrc, empathy_video_src, GST_TYPE_BIN)
/* Keep in sync with EmpathyGstVideoSrcChannel */
static const gchar *channel_names[NR_EMPATHY_GST_VIDEO_SRC_CHANNELS] = {
"contrast", "brightness", "gamma" };
/* signal enum */
#if 0
enum
{
LAST_SIGNAL
};
static guint signals[LAST_SIGNAL] = {0};
#endif
/* private structure */
typedef struct _EmpathyGstVideoSrcPrivate EmpathyGstVideoSrcPrivate;
struct _EmpathyGstVideoSrcPrivate
{
gboolean dispose_has_run;
GstElement *src;
/* Element implementing a ColorBalance interface */
GstElement *balance;
};
#define EMPATHY_GST_VIDEO_SRC_GET_PRIVATE(o) \
(G_TYPE_INSTANCE_GET_PRIVATE ((o), EMPATHY_TYPE_GST_VIDEO_SRC, \
EmpathyGstVideoSrcPrivate))
/**
* empathy_gst_make_to_bin - make gst faktory, add to bin and link it.
* @bin - bit to add to.
* @src - Element to link new crated element with. IF src == NULL,
* we will only create Factory and add it to the bin.
* @factoryname - factory name of factory to create.
* we will return pointer to new Element
*/
GstElement *
empathy_gst_make_to_bin (GstBin *bin, GstElement *src,
const gchar *factoryname)
{
GstElement *ret;
if (!(ret = gst_element_factory_make (factoryname, NULL)))
{
g_warning ("Factory \"%s\" not found.", factoryname);
goto error;
}
if (!gst_bin_add (bin, ret))
{
g_warning ("Can't add \"%s\" to bin.", factoryname);
goto error;
}
/* do not link if src == NULL, just exit here */
if (src == NULL)
return ret;
if (!gst_element_link (src, ret))
{
g_warning ("Can't link \"%s\".", factoryname);
gst_bin_remove (bin, ret);
goto error;
}
return ret;
error:
gst_object_unref (ret);
return NULL;
}
static void
empathy_video_src_init (EmpathyGstVideoSrc *obj)
{
EmpathyGstVideoSrcPrivate *priv = EMPATHY_GST_VIDEO_SRC_GET_PRIVATE (obj);
GstElement *scale, *colorspace, *capsfilter;
GstPad *ghost, *src;
GstCaps *caps;
/* allocate any data required by the object here */
priv->src = empathy_gst_make_to_bin (GST_BIN (obj), NULL, "gconfvideosrc");
if (!priv->src)
g_error ("gst-plugins-good is probably missing. exit");
scale = empathy_gst_make_to_bin (GST_BIN (obj), priv->src, "videoscale");
if (!scale)
g_error ("gst-plugins-base is probably missing. exit");
colorspace = empathy_gst_make_to_bin (GST_BIN (obj),
scale, "ffmpegcolorspace");
if (!colorspace)
g_error ("gst-plugins-base is probably missing. exit");
capsfilter = empathy_gst_make_to_bin (GST_BIN (obj), scale, "capsfilter");
if (!capsfilter)
g_error ("core libgstreamer is probably missing. exit");
caps = gst_caps_new_simple ("video/x-raw-yuv",
"width", G_TYPE_INT, 320,
"height", G_TYPE_INT, 240,
NULL);
g_object_set (G_OBJECT (capsfilter), "caps", caps, NULL);
src = gst_element_get_static_pad (colorspace, "src");
if (!src)
g_error ("src pad not found. exit");
ghost = gst_ghost_pad_new ("src", src);
if (!ghost)
g_error ("can't create ghost pad. exit");
if (!gst_element_add_pad (GST_ELEMENT (obj), ghost))
g_error ("pad with the same name already existed or "
"the pad already had another parent. exit");
gst_object_unref (G_OBJECT (src));
}
static void empathy_video_src_dispose (GObject *object);
static void empathy_video_src_finalize (GObject *object);
static void
empathy_video_src_class_init (EmpathyGstVideoSrcClass *empathy_video_src_class)
{
GObjectClass *object_class = G_OBJECT_CLASS (empathy_video_src_class);
g_type_class_add_private (empathy_video_src_class,
sizeof (EmpathyGstVideoSrcPrivate));
object_class->dispose = empathy_video_src_dispose;
object_class->finalize = empathy_video_src_finalize;
}
void
empathy_video_src_dispose (GObject *object)
{
EmpathyGstVideoSrc *self = EMPATHY_GST_VIDEO_SRC (object);
EmpathyGstVideoSrcPrivate *priv = EMPATHY_GST_VIDEO_SRC_GET_PRIVATE (self);
if (priv->dispose_has_run)
return;
priv->dispose_has_run = TRUE;
/* release any references held by the object here */
if (G_OBJECT_CLASS (empathy_video_src_parent_class)->dispose)
G_OBJECT_CLASS (empathy_video_src_parent_class)->dispose (object);
}
void
empathy_video_src_finalize (GObject *object)
{
//EmpathyGstVideoSrc *self = EMPATHY_GST_VIDEO_SRC (object);
//EmpathyGstVideoSrcPrivate *priv = EMPATHY_GST_VIDEO_SRC_GET_PRIVATE (self);
/* free any data held directly by the object here */
G_OBJECT_CLASS (empathy_video_src_parent_class)->finalize (object);
}
GstElement *
empathy_video_src_new (void)
{
static gboolean registered = FALSE;
if (!registered) {
if (!gst_element_register (NULL, "empathyvideosrc",
GST_RANK_NONE, EMPATHY_TYPE_GST_VIDEO_SRC))
return NULL;
registered = TRUE;
}
return gst_element_factory_make ("empathyvideosrc", NULL);
}
void
empathy_video_src_set_channel (GstElement *src,
EmpathyGstVideoSrcChannel channel, guint percent)
{
GstElement *color;
GstColorBalance *balance;
const GList *channels;
GList *l;
/* Find something supporting GstColorBalance */
color = gst_bin_get_by_interface (GST_BIN (src), GST_TYPE_COLOR_BALANCE);
if (color == NULL)
return;
balance = GST_COLOR_BALANCE (color);
channels = gst_color_balance_list_channels (balance);
for (l = (GList *) channels; l != NULL; l = g_list_next (l))
{
GstColorBalanceChannel *c = GST_COLOR_BALANCE_CHANNEL (l->data);
if (g_ascii_strcasecmp (c->label, channel_names[channel]) == 0)
{
gst_color_balance_set_value (balance, c,
((c->max_value - c->min_value) * percent)/100
+ c->min_value);
break;
}
}
g_object_unref (color);
}
guint
empathy_video_src_get_channel (GstElement *src,
EmpathyGstVideoSrcChannel channel)
{
GstElement *color;
GstColorBalance *balance;
const GList *channels;
GList *l;
guint percent = 0;
/* Find something supporting GstColorBalance */
color = gst_bin_get_by_interface (GST_BIN (src), GST_TYPE_COLOR_BALANCE);
if (color == NULL)
return percent;
balance = GST_COLOR_BALANCE (color);
channels = gst_color_balance_list_channels (balance);
for (l = (GList *) channels; l != NULL; l = g_list_next (l))
{
GstColorBalanceChannel *c = GST_COLOR_BALANCE_CHANNEL (l->data);
if (g_ascii_strcasecmp (c->label, channel_names[channel]) == 0)
{
percent =
((gst_color_balance_get_value (balance, c)
- c->min_value) * 100) /
(c->max_value - c->min_value);
break;
}
}
g_object_unref (color);
return percent;
}
guint
empathy_video_src_get_supported_channels (GstElement *src)
{
GstElement *color;
GstColorBalance *balance;
const GList *channels;
GList *l;
guint result = 0;
/* Find something supporting GstColorBalance */
color = gst_bin_get_by_interface (GST_BIN (src), GST_TYPE_COLOR_BALANCE);
if (color == NULL)
goto out;
balance = GST_COLOR_BALANCE (color);
channels = gst_color_balance_list_channels (balance);
for (l = (GList *) channels; l != NULL; l = g_list_next (l))
{
GstColorBalanceChannel *channel = GST_COLOR_BALANCE_CHANNEL (l->data);
int i;
for (i = 0; i < NR_EMPATHY_GST_VIDEO_SRC_CHANNELS; i++)
{
if (g_ascii_strcasecmp (channel->label, channel_names[i]) == 0)
{
result |= (1 << i);
break;
}
}
}
g_object_unref (color);
out:
return result;
}
