gstreamer/ges/ges-track-title-source.c

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/* GStreamer Editing Services
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* Copyright (C) 2010 Brandon Lewis <brandon.lewis@collabora.co.uk>
* 2010 Nokia Corporation
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*
* 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.
*/
/**
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* SECTION:ges-track-title-source
* @short_description: render stand-alone text titles
*
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*/
#include "ges-internal.h"
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#include "ges-track-object.h"
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#include "ges-track-title-source.h"
#include "ges-track-video-test-source.h"
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G_DEFINE_TYPE (GESTrackTitleSource, ges_track_title_source,
GES_TYPE_TRACK_SOURCE);
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struct _GESTrackTitleSourcePrivate
{
gchar *text;
gchar *font_desc;
GESTextHAlign halign;
GESTextVAlign valign;
GstElement *text_el;
GstElement *background_el;
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};
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enum
{
PROP_0,
};
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static void ges_track_title_source_dispose (GObject * object);
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static void ges_track_title_source_get_property (GObject * object, guint
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property_id, GValue * value, GParamSpec * pspec);
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static void ges_track_title_source_set_property (GObject * object, guint
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property_id, const GValue * value, GParamSpec * pspec);
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static GstElement *ges_track_title_source_create_element (GESTrackObject *
self);
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static void
ges_track_title_source_class_init (GESTrackTitleSourceClass * klass)
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{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GESTrackObjectClass *bg_class = GES_TRACK_OBJECT_CLASS (klass);
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g_type_class_add_private (klass, sizeof (GESTrackTitleSourcePrivate));
object_class->get_property = ges_track_title_source_get_property;
object_class->set_property = ges_track_title_source_set_property;
object_class->dispose = ges_track_title_source_dispose;
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bg_class->create_element = ges_track_title_source_create_element;
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}
static void
ges_track_title_source_init (GESTrackTitleSource * self)
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{
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self->priv = G_TYPE_INSTANCE_GET_PRIVATE (self,
GES_TYPE_TRACK_TITLE_SOURCE, GESTrackTitleSourcePrivate);
self->priv->text = NULL;
self->priv->font_desc = NULL;
self->priv->text_el = NULL;
self->priv->halign = DEFAULT_HALIGNMENT;
self->priv->valign = DEFAULT_VALIGNMENT;
self->priv->background_el = NULL;
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}
static void
ges_track_title_source_dispose (GObject * object)
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{
GESTrackTitleSource *self = GES_TRACK_TITLE_SOURCE (object);
if (self->priv->text) {
g_free (self->priv->text);
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}
if (self->priv->font_desc) {
g_free (self->priv->font_desc);
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}
if (self->priv->text_el) {
g_object_unref (self->priv->text_el);
self->priv->text_el = NULL;
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}
if (self->priv->background_el) {
g_object_unref (self->priv->background_el);
self->priv->background_el = NULL;
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}
G_OBJECT_CLASS (ges_track_title_source_parent_class)->dispose (object);
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}
static void
ges_track_title_source_get_property (GObject * object,
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guint property_id, GValue * value, GParamSpec * pspec)
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{
switch (property_id) {
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}
}
static void
ges_track_title_source_set_property (GObject * object,
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guint property_id, const GValue * value, GParamSpec * pspec)
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{
switch (property_id) {
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}
}
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static GstElement *
ges_track_title_source_create_element (GESTrackObject * object)
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{
GESTrackTitleSource *self = GES_TRACK_TITLE_SOURCE (object);
GESTrackTitleSourcePrivate *priv = self->priv;
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GstElement *topbin, *background, *text;
GstPad *src;
topbin = gst_bin_new ("titlesrc-bin");
background = gst_element_factory_make ("videotestsrc", "titlesrc-bg");
text = gst_element_factory_make ("textoverlay", "titlsrc-text");
if (priv->text) {
g_object_set (text, "text", priv->text, NULL);
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}
if (priv->font_desc) {
g_object_set (text, "font-desc", priv->font_desc, NULL);
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}
g_object_set (text, "valignment", (gint) priv->valign, "halignment",
(gint) priv->halign, NULL);
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g_object_set (background, "pattern", (gint) GES_VIDEO_TEST_PATTERN_BLACK,
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NULL);
gst_bin_add_many (GST_BIN (topbin), background, text, NULL);
gst_element_link_pads_full (background, "src", text, "video_sink",
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GST_PAD_LINK_CHECK_NOTHING);
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src = gst_ghost_pad_new ("src", gst_element_get_static_pad (text, "src"));
gst_element_add_pad (topbin, src);
g_object_ref (text);
g_object_ref (background);
priv->text_el = text;
priv->background_el = background;
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return topbin;
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}
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/**
* ges_track_title_source_set_text:
* @self: the #GESTrackTitleSource* to set text on
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* @text: the text to render. an internal copy of this text will be
* made.
*
* Sets the text this track object will render.
*/
void
ges_track_title_source_set_text (GESTrackTitleSource * self, const gchar * text)
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{
if (self->priv->text)
g_free (self->priv->text);
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self->priv->text = g_strdup (text);
if (self->priv->text_el)
g_object_set (self->priv->text_el, "text", text, NULL);
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}
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/**
* ges_track_title_source_set_font_desc:
* @self: the #GESTrackTitleSource
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* @font_desc: the pango font description
*
* Set the pango font description this source will use to render
* the text.
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*/
void
ges_track_title_source_set_font_desc (GESTrackTitleSource * self,
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const gchar * font_desc)
{
if (self->priv->font_desc)
g_free (self->priv->font_desc);
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self->priv->font_desc = g_strdup (font_desc);
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GST_LOG ("setting font-desc to '%s'", font_desc);
if (self->priv->text_el)
g_object_set (self->priv->text_el, "font-desc", font_desc, NULL);
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}
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/**
* ges_track_title_source_set_valignment:
* @self: the #GESTrackTitleSource* to set text on
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* @valign: #GESTextVAlign
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*
* Sets the vertical aligment of the text.
*/
void
ges_track_title_source_set_valignment (GESTrackTitleSource * self,
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GESTextVAlign valign)
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{
self->priv->valign = valign;
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GST_LOG ("set valignment to: %d", valign);
if (self->priv->text_el)
g_object_set (self->priv->text_el, "valignment", valign, NULL);
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}
/**
* ges_track_title_source_set_halignment:
* @self: the #GESTrackTitleSource* to set text on
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* @halign: #GESTextHAlign
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*
* Sets the vertical aligment of the text.
*/
void
ges_track_title_source_set_halignment (GESTrackTitleSource * self,
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GESTextHAlign halign)
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{
self->priv->halign = halign;
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GST_LOG ("set halignment to: %d", halign);
if (self->priv->text_el)
g_object_set (self->priv->text_el, "halignment", halign, NULL);
}
/**
* ges_track_title_source_get_text:
* @source: a #GESTrackTitleSource
*
* Get the text currently set on the @source.
*
* Returns: (transfer none): The text currently set on the @source.
*/
const gchar *
ges_track_title_source_get_text (GESTrackTitleSource * source)
{
return source->priv->text;
}
/**
* ges_track_title_source_get_font_desc:
* @source: a #GESTrackTitleSource
*
* Get the pango font description used by @source.
*
* Returns: (transfer none): The pango font description used by this
* @source.
*/
const gchar *
ges_track_title_source_get_font_desc (GESTrackTitleSource * source)
{
return source->priv->font_desc;
}
/**
* ges_track_title_source_get_halignment:
* @source: a #GESTrackTitleSource
*
* Get the horizontal aligment used by this source.
*
* Returns: The horizontal aligment used by this source.
*/
GESTextHAlign
ges_track_title_source_get_halignment (GESTrackTitleSource * source)
{
return source->priv->halign;
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}
/**
* ges_track_title_source_get_valignment:
* @source: a #GESTrackTitleSource
*
* Get the vertical aligment used by this source.
*
* Returns: The vertical aligment used by this source.
*/
GESTextVAlign
ges_track_title_source_get_valignment (GESTrackTitleSource * source)
{
return source->priv->valign;
}
/**
* ges_track_title_source_new:
*
* Creates a new #GESTrackTitleSource.
*
* Returns: The newly created #GESTrackTitleSource, or %NULL if there was an
* error.
*/
GESTrackTitleSource *
ges_track_title_source_new (void)
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{
return g_object_new (GES_TYPE_TRACK_TITLE_SOURCE, NULL);
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}