gstreamer/ges/ges-track-title-source.c
2010-12-09 15:12:34 +01:00

253 lines
6.6 KiB
C

/* GStreamer Editing Services
* Copyright (C) 2010 Brandon Lewis <brandon.lewis@collabora.co.uk>
* 2010 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
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/**
* SECTION:ges-track-title-source
* @short_description: render stand-alone text titles
*
*/
#include "ges-internal.h"
#include "ges-track-object.h"
#include "ges-track-title-source.h"
#include "ges-track-video-test-source.h"
G_DEFINE_TYPE (GESTrackTitleSource, ges_track_title_src, GES_TYPE_TRACK_SOURCE);
struct _GESTrackTitleSourcePrivate
{
/* Dummy variable */
void *nothing;
};
enum
{
PROP_0,
};
static void ges_track_title_src_dispose (GObject * object);
static void ges_track_title_src_get_property (GObject * object, guint
property_id, GValue * value, GParamSpec * pspec);
static void ges_track_title_src_set_property (GObject * object, guint
property_id, const GValue * value, GParamSpec * pspec);
static GstElement *ges_track_title_src_create_element (GESTrackSource * self);
static void
ges_track_title_src_class_init (GESTrackTitleSourceClass * klass)
{
GObjectClass *object_class;
GESTrackSourceClass *bg_class;
g_type_class_add_private (klass, sizeof (GESTrackTitleSourcePrivate));
object_class = G_OBJECT_CLASS (klass);
bg_class = GES_TRACK_SOURCE_CLASS (klass);
object_class->get_property = ges_track_title_src_get_property;
object_class->set_property = ges_track_title_src_set_property;
object_class->dispose = ges_track_title_src_dispose;
bg_class->create_element = ges_track_title_src_create_element;
}
static void
ges_track_title_src_init (GESTrackTitleSource * self)
{
self->priv = G_TYPE_INSTANCE_GET_PRIVATE (self,
GES_TYPE_TRACK_TITLE_SOURCE, GESTrackTitleSourcePrivate);
self->text = NULL;
self->font_desc = NULL;
self->text_el = NULL;
self->halign = DEFAULT_HALIGNMENT;
self->valign = DEFAULT_VALIGNMENT;
self->background_el = NULL;
}
static void
ges_track_title_src_dispose (GObject * object)
{
GESTrackTitleSource *self = GES_TRACK_TITLE_SOURCE (object);
if (self->text) {
g_free (self->text);
}
if (self->font_desc) {
g_free (self->font_desc);
}
if (self->text_el) {
g_object_unref (self->text_el);
self->text_el = NULL;
}
if (self->background_el) {
g_object_unref (self->background_el);
self->background_el = NULL;
}
G_OBJECT_CLASS (ges_track_title_src_parent_class)->dispose (object);
}
static void
ges_track_title_src_get_property (GObject * object,
guint property_id, GValue * value, GParamSpec * pspec)
{
switch (property_id) {
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}
}
static void
ges_track_title_src_set_property (GObject * object,
guint property_id, const GValue * value, GParamSpec * pspec)
{
switch (property_id) {
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}
}
static GstElement *
ges_track_title_src_create_element (GESTrackSource * object)
{
GESTrackTitleSource *self = GES_TRACK_TITLE_SOURCE (object);
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 (self->text) {
g_object_set (text, "text", self->text, NULL);
}
if (self->font_desc) {
g_object_set (text, "font-desc", self->font_desc, NULL);
}
g_object_set (text, "valignment", (gint) self->valign, "halignment",
(gint) self->halign, NULL);
g_object_set (background, "pattern", (gint) GES_VIDEO_TEST_PATTERN_BLACK,
NULL);
gst_bin_add_many (GST_BIN (topbin), background, text, NULL);
gst_element_link_pads_full (background, "src", text, "video_sink",
GST_PAD_LINK_CHECK_NOTHING);
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);
self->text_el = text;
self->background_el = background;
return topbin;
}
/**
* ges_track_title_source_set_text:
* @self: the #GESTrackTitleSource* to set text on
* @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)
{
if (self->text)
g_free (self->text);
self->text = g_strdup (text);
if (self->text_el)
g_object_set (self->text_el, "text", text, NULL);
}
/**
* ges_track_title_source_set_font_desc:
* @self: the #GESTrackTitleSource
* @font_desc: the pango font description
*
* Sets the text this track object will render.
*
*/
void
ges_track_title_source_set_font_desc (GESTrackTitleSource * self,
const gchar * font_desc)
{
if (self->font_desc)
g_free (self->font_desc);
self->font_desc = g_strdup (font_desc);
GST_LOG ("setting font-desc to '%s'", font_desc);
if (self->text_el)
g_object_set (self->text_el, "font-desc", font_desc, NULL);
}
/**
* ges_track_title_source_valignment:
* @self: the #GESTrackTitleSource* to set text on
* @valign: #GESTextVAlign
*
* Sets the vertical aligment of the text.
*/
void
ges_track_title_source_set_valignment (GESTrackTitleSource * self,
GESTextVAlign valign)
{
self->valign = valign;
GST_LOG ("set valignment to: %d", valign);
if (self->text_el)
g_object_set (self->text_el, "valignment", valign, NULL);
}
/**
* ges_track_title_source_halignment:
* @self: the #GESTrackTitleSource* to set text on
* @halign: #GESTextHAlign
*
* Sets the vertical aligment of the text.
*/
void
ges_track_title_source_set_halignment (GESTrackTitleSource * self,
GESTextHAlign halign)
{
self->halign = halign;
GST_LOG ("set halignment to: %d", halign);
if (self->text_el)
g_object_set (self->text_el, "halignment", halign, NULL);
}
GESTrackTitleSource *
ges_track_title_source_new (void)
{
return g_object_new (GES_TYPE_TRACK_TITLE_SOURCE, NULL);
}