gstreamer/ges/ges-text-overlay-clip.c

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/* GStreamer Editing Services
* Copyright (C) 2009 Edward Hervey <edward.hervey@collabora.co.uk>
* 2009 Nokia Corporation
*
* 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
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/**
* SECTION:gestextoverlayclip
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* @short_description: Render text onto another stream in a GESLayer
*
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* Renders text onto the next lower priority stream using textrender.
*/
#include "ges-internal.h"
#include "ges-text-overlay-clip.h"
#include "ges-track-element.h"
#include "ges-text-overlay.h"
#include <string.h>
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G_DEFINE_TYPE (GESTextOverlayClip, ges_text_overlay_clip,
GES_TYPE_OVERLAY_CLIP);
#define DEFAULT_PROP_TEXT ""
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#define DEFAULT_PROP_FONT_DESC "Serif 36"
#define DEFAULT_PROP_VALIGNMENT GES_TEXT_VALIGN_BASELINE
#define DEFAULT_PROP_HALIGNMENT GES_TEXT_HALIGN_CENTER
#
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struct _GESTextOverlayClipPrivate
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{
gchar *text;
gchar *font_desc;
GESTextHAlign halign;
GESTextVAlign valign;
guint32 color;
gdouble xpos;
gdouble ypos;
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};
enum
{
PROP_0,
PROP_TEXT,
PROP_FONT_DESC,
PROP_HALIGNMENT,
PROP_VALIGNMENT,
PROP_COLOR,
PROP_XPOS,
PROP_YPOS,
};
static GESTrackElement
* ges_text_overlay_clip_create_track_element (GESClip * clip,
GESTrackType type);
static void
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ges_text_overlay_clip_get_property (GObject * object, guint property_id,
GValue * value, GParamSpec * pspec)
{
GESTextOverlayClipPrivate *priv = GES_OVERLAY_TEXT_CLIP (object)->priv;
switch (property_id) {
case PROP_TEXT:
g_value_set_string (value, priv->text);
break;
case PROP_FONT_DESC:
g_value_set_string (value, priv->font_desc);
break;
case PROP_HALIGNMENT:
g_value_set_enum (value, priv->halign);
break;
case PROP_VALIGNMENT:
g_value_set_enum (value, priv->valign);
break;
case PROP_COLOR:
g_value_set_uint (value, priv->color);
break;
case PROP_XPOS:
g_value_set_double (value, priv->xpos);
break;
case PROP_YPOS:
g_value_set_double (value, priv->ypos);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}
}
static void
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ges_text_overlay_clip_set_property (GObject * object, guint property_id,
const GValue * value, GParamSpec * pspec)
{
GESTextOverlayClip *uriclip = GES_OVERLAY_TEXT_CLIP (object);
switch (property_id) {
case PROP_TEXT:
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ges_text_overlay_clip_set_text (uriclip, g_value_get_string (value));
break;
case PROP_FONT_DESC:
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ges_text_overlay_clip_set_font_desc (uriclip, g_value_get_string (value));
break;
case PROP_HALIGNMENT:
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ges_text_overlay_clip_set_halign (uriclip, g_value_get_enum (value));
break;
case PROP_VALIGNMENT:
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ges_text_overlay_clip_set_valign (uriclip, g_value_get_enum (value));
break;
case PROP_COLOR:
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ges_text_overlay_clip_set_color (uriclip, g_value_get_uint (value));
break;
case PROP_XPOS:
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ges_text_overlay_clip_set_xpos (uriclip, g_value_get_double (value));
break;
case PROP_YPOS:
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ges_text_overlay_clip_set_ypos (uriclip, g_value_get_double (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}
}
static void
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ges_text_overlay_clip_dispose (GObject * object)
{
GESTextOverlayClipPrivate *priv = GES_OVERLAY_TEXT_CLIP (object)->priv;
if (priv->text)
g_free (priv->text);
if (priv->font_desc)
g_free (priv->font_desc);
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G_OBJECT_CLASS (ges_text_overlay_clip_parent_class)->dispose (object);
}
static void
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ges_text_overlay_clip_class_init (GESTextOverlayClipClass * klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
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GESClipClass *timobj_class = GES_CLIP_CLASS (klass);
g_type_class_add_private (klass, sizeof (GESTextOverlayClipPrivate));
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object_class->get_property = ges_text_overlay_clip_get_property;
object_class->set_property = ges_text_overlay_clip_set_property;
object_class->dispose = ges_text_overlay_clip_dispose;
/**
* GESTextOverlayClip:text:
*
* The text to diplay
*/
g_object_class_install_property (object_class, PROP_TEXT,
g_param_spec_string ("text", "Text", "The text to display",
DEFAULT_PROP_TEXT, G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
/**
* GESTextOverlayClip:font-desc:
*
* Pango font description string
*/
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_FONT_DESC,
g_param_spec_string ("font-desc", "font description",
"Pango font description of font to be used for rendering. "
"See documentation of pango_font_description_from_string "
"for syntax.", DEFAULT_PROP_FONT_DESC,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
/**
* GESTextOverlayClip:valignment:
*
* Vertical alignent of the text
*/
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_VALIGNMENT,
g_param_spec_enum ("valignment", "vertical alignment",
"Vertical alignment of the text", GES_TEXT_VALIGN_TYPE,
DEFAULT_PROP_VALIGNMENT, G_PARAM_READWRITE | G_PARAM_CONSTRUCT |
G_PARAM_STATIC_STRINGS));
/**
* GESTextOverlayClip:halignment:
*
* Horizontal alignment of the text
*/
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_HALIGNMENT,
g_param_spec_enum ("halignment", "horizontal alignment",
"Horizontal alignment of the text",
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GES_TEXT_HALIGN_TYPE, DEFAULT_PROP_HALIGNMENT,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
timobj_class->create_track_element =
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ges_text_overlay_clip_create_track_element;
/**
* GESTextOverlayClip:color:
*
* The color of the text
*/
g_object_class_install_property (object_class, PROP_COLOR,
g_param_spec_uint ("color", "Color", "The color of the text",
0, G_MAXUINT32, G_MAXUINT32, G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
/**
* GESTextOverlayClip:xpos:
*
* The horizontal position of the text
*/
g_object_class_install_property (object_class, PROP_XPOS,
g_param_spec_double ("xpos", "Xpos", "The horizontal position",
0, 1, 0.5, G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
/**
* GESTextOverlayClip:ypos:
*
* The vertical position of the text
*/
g_object_class_install_property (object_class, PROP_YPOS,
g_param_spec_double ("ypos", "Ypos", "The vertical position",
0, 1, 0.5, G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
}
static void
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ges_text_overlay_clip_init (GESTextOverlayClip * self)
{
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self->priv = G_TYPE_INSTANCE_GET_PRIVATE (self,
GES_TYPE_OVERLAY_TEXT_CLIP, GESTextOverlayClipPrivate);
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GES_TIMELINE_ELEMENT (self)->duration = 0;
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/* Not 100% needed since gobject contents are memzero'd when created */
self->priv->text = NULL;
self->priv->font_desc = NULL;
self->priv->halign = DEFAULT_PROP_HALIGNMENT;
self->priv->valign = DEFAULT_PROP_VALIGNMENT;
self->priv->color = G_MAXUINT32;
self->priv->xpos = 0.5;
self->priv->ypos = 0.5;
}
/**
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* ges_text_overlay_clip_set_text:
* @self: the #GESTextOverlayClip* to set text on
* @text: the text to render. an internal copy of this text will be
* made.
*
* Sets the text this clip will render.
*
*/
void
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ges_text_overlay_clip_set_text (GESTextOverlayClip * self, const gchar * text)
{
GList *tmp;
GST_DEBUG ("self:%p, text:%s", self, text);
if (self->priv->text)
g_free (self->priv->text);
self->priv->text = g_strdup (text);
for (tmp = GES_CONTAINER_CHILDREN (self); tmp; tmp = tmp->next) {
GESTrackElement *trackelement = (GESTrackElement *) tmp->data;
if (ges_track_element_get_track (trackelement)->type ==
GES_TRACK_TYPE_VIDEO)
ges_text_overlay_set_text (GES_TEXT_OVERLAY (trackelement),
self->priv->text);
}
}
/**
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* ges_text_overlay_clip_set_font_desc:
* @self: the #GESTextOverlayClip*
* @font_desc: the pango font description
*
* Sets the pango font description of the text
*
*/
void
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ges_text_overlay_clip_set_font_desc (GESTextOverlayClip * self,
const gchar * font_desc)
{
GList *tmp;
GST_DEBUG ("self:%p, font_desc:%s", self, font_desc);
if (self->priv->font_desc)
g_free (self->priv->font_desc);
self->priv->font_desc = g_strdup (font_desc);
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for (tmp = GES_CONTAINER_CHILDREN (self); tmp; tmp = tmp->next) {
GESTrackElement *trackelement = (GESTrackElement *) tmp->data;
if (ges_track_element_get_track (trackelement)->type ==
GES_TRACK_TYPE_VIDEO)
ges_text_overlay_set_font_desc (GES_TEXT_OVERLAY
(trackelement), self->priv->font_desc);
}
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}
/**
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* ges_text_overlay_clip_set_halign:
* @self: the #GESTextOverlayClip* to set horizontal alignement of text on
* @halign: #GESTextHAlign
*
* Sets the horizontal aligment of the text.
*
*/
void
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ges_text_overlay_clip_set_halign (GESTextOverlayClip * self,
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GESTextHAlign halign)
{
GList *tmp;
GST_DEBUG ("self:%p, halign:%d", self, halign);
self->priv->halign = halign;
for (tmp = GES_CONTAINER_CHILDREN (self); tmp; tmp = tmp->next) {
GESTrackElement *trackelement = (GESTrackElement *) tmp->data;
if (ges_track_element_get_track (trackelement)->type ==
GES_TRACK_TYPE_VIDEO)
ges_text_overlay_set_halignment (GES_TEXT_OVERLAY
(trackelement), self->priv->halign);
}
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}
/**
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* ges_text_overlay_clip_set_valign:
* @self: the #GESTextOverlayClip* to set vertical alignement of text on
* @valign: #GESTextVAlign
*
* Sets the vertical aligment of the text.
*
*/
void
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ges_text_overlay_clip_set_valign (GESTextOverlayClip * self,
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GESTextVAlign valign)
{
GList *tmp;
GST_DEBUG ("self:%p, valign:%d", self, valign);
self->priv->valign = valign;
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for (tmp = GES_CONTAINER_CHILDREN (self); tmp; tmp = tmp->next) {
GESTrackElement *trackelement = (GESTrackElement *) tmp->data;
if (ges_track_element_get_track (trackelement)->type ==
GES_TRACK_TYPE_VIDEO)
ges_text_overlay_set_valignment (GES_TEXT_OVERLAY
(trackelement), self->priv->valign);
}
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}
/**
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* ges_text_overlay_clip_set_color:
* @self: the #GESTextOverlayClip* to set
* @color: The color @self is being set to
*
* Sets the color of the text.
*/
void
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ges_text_overlay_clip_set_color (GESTextOverlayClip * self, guint32 color)
{
GList *tmp;
GST_DEBUG ("self:%p, color:%d", self, color);
self->priv->color = color;
for (tmp = GES_CONTAINER_CHILDREN (self); tmp; tmp = tmp->next) {
GESTrackElement *trackelement = (GESTrackElement *) tmp->data;
if (ges_track_element_get_track (trackelement)->type ==
GES_TRACK_TYPE_VIDEO)
ges_text_overlay_set_color (GES_TEXT_OVERLAY (trackelement),
self->priv->color);
}
}
/**
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* ges_text_overlay_clip_set_xpos:
* @self: the #GESTextOverlayClip* to set
* @position: The horizontal position @self is being set to
*
* Sets the horizontal position of the text.
*/
void
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ges_text_overlay_clip_set_xpos (GESTextOverlayClip * self, gdouble position)
{
GList *tmp;
GST_DEBUG ("self:%p, xpos:%f", self, position);
self->priv->xpos = position;
for (tmp = GES_CONTAINER_CHILDREN (self); tmp; tmp = tmp->next) {
GESTrackElement *trackelement = (GESTrackElement *) tmp->data;
if (ges_track_element_get_track (trackelement)->type ==
GES_TRACK_TYPE_VIDEO)
ges_text_overlay_set_xpos (GES_TEXT_OVERLAY (trackelement),
self->priv->xpos);
}
}
/**
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* ges_text_overlay_clip_set_ypos:
* @self: the #GESTextOverlayClip* to set
* @position: The vertical position @self is being set to
*
* Sets the vertical position of the text.
*/
void
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ges_text_overlay_clip_set_ypos (GESTextOverlayClip * self, gdouble position)
{
GList *tmp;
GST_DEBUG ("self:%p, ypos:%f", self, position);
self->priv->ypos = position;
for (tmp = GES_CONTAINER_CHILDREN (self); tmp; tmp = tmp->next) {
GESTrackElement *trackelement = (GESTrackElement *) tmp->data;
if (ges_track_element_get_track (trackelement)->type ==
GES_TRACK_TYPE_VIDEO)
ges_text_overlay_set_ypos (GES_TEXT_OVERLAY (trackelement),
self->priv->ypos);
}
}
/**
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* ges_text_overlay_clip_get_text:
* @self: a #GESTextOverlayClip
*
* Get the text currently set on @self.
*
* Returns: The text currently set on @self.
*
*/
const gchar *
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ges_text_overlay_clip_get_text (GESTextOverlayClip * self)
{
return self->priv->text;
}
/**
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* ges_text_overlay_clip_get_font_desc:
* @self: a #GESTextOverlayClip
*
* Get the pango font description used by @self.
*
* Returns: The pango font description used by @self.
*/
const char *
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ges_text_overlay_clip_get_font_desc (GESTextOverlayClip * self)
{
return self->priv->font_desc;
}
/**
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* ges_text_overlay_clip_get_halignment:
* @self: a #GESTextOverlayClip
*
* Get the horizontal aligment used by @self.
*
* Returns: The horizontal aligment used by @self.
*/
GESTextHAlign
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ges_text_overlay_clip_get_halignment (GESTextOverlayClip * self)
{
return self->priv->halign;
}
/**
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* ges_text_overlay_clip_get_valignment:
* @self: a #GESTextOverlayClip
*
* Get the vertical aligment used by @self.
*
* Returns: The vertical aligment used by @self.
*/
GESTextVAlign
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ges_text_overlay_clip_get_valignment (GESTextOverlayClip * self)
{
return self->priv->valign;
}
/**
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* ges_text_overlay_clip_get_color:
* @self: a #GESTextOverlayClip
*
* Get the color used by @source.
*
* Returns: The color used by @source.
*/
const guint32
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ges_text_overlay_clip_get_color (GESTextOverlayClip * self)
{
return self->priv->color;
}
/**
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* ges_text_overlay_clip_get_xpos:
* @self: a #GESTextOverlayClip
*
* Get the horizontal position used by @source.
*
* Returns: The horizontal position used by @source.
*/
const gdouble
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ges_text_overlay_clip_get_xpos (GESTextOverlayClip * self)
{
return self->priv->xpos;
}
/**
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* ges_text_overlay_clip_get_ypos:
* @self: a #GESTextOverlayClip
*
* Get the vertical position used by @source.
*
* Returns: The vertical position used by @source.
*/
const gdouble
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ges_text_overlay_clip_get_ypos (GESTextOverlayClip * self)
{
return self->priv->ypos;
}
static GESTrackElement *
ges_text_overlay_clip_create_track_element (GESClip * clip, GESTrackType type)
{
GESTextOverlayClipPrivate *priv = GES_OVERLAY_TEXT_CLIP (clip)->priv;
GESTrackElement *res = NULL;
GST_DEBUG ("Creating a GESTrackOverlay");
if (type == GES_TRACK_TYPE_VIDEO) {
res = (GESTrackElement *) ges_text_overlay_new ();
GST_DEBUG ("Setting text property");
ges_text_overlay_set_text ((GESTextOverlay *) res, priv->text);
ges_text_overlay_set_font_desc ((GESTextOverlay *) res, priv->font_desc);
ges_text_overlay_set_halignment ((GESTextOverlay *) res, priv->halign);
ges_text_overlay_set_valignment ((GESTextOverlay *) res, priv->valign);
ges_text_overlay_set_color ((GESTextOverlay *) res, priv->color);
ges_text_overlay_set_xpos ((GESTextOverlay *) res, priv->xpos);
ges_text_overlay_set_ypos ((GESTextOverlay *) res, priv->ypos);
}
return res;
}
/**
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* ges_text_overlay_clip_new:
*
* Creates a new #GESTextOverlayClip
*
* Returns: The newly created #GESTextOverlayClip, or NULL if there was an
* error.
*/
GESTextOverlayClip *
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ges_text_overlay_clip_new (void)
{
GESTextOverlayClip *new_clip;
GESAsset *asset = ges_asset_request (GES_TYPE_OVERLAY_TEXT_CLIP, NULL, NULL);
new_clip = GES_OVERLAY_TEXT_CLIP (ges_asset_extract (asset, NULL));
gst_object_unref (asset);
return new_clip;
}