gstreamer/ges/ges-timeline-text-overlay.c
2010-12-09 15:12:34 +01:00

356 lines
10 KiB
C

/* 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
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/**
* SECTION:ges-timeline-text-overlay
* @short_description: Render text onto another stream in a #GESTimelineLayer
*
* Renders text onto the next lower priority stream using textrender.
*/
#include "ges-internal.h"
#include "ges-timeline-text-overlay.h"
#include "ges-track-object.h"
#include "ges-track-text-overlay.h"
#include <string.h>
G_DEFINE_TYPE (GESTimelineTextOverlay, ges_tl_text_overlay,
GES_TYPE_TIMELINE_OVERLAY);
#define DEFAULT_PROP_TEXT ""
#define DEFAULT_PROP_FONT_DESC "Serif 36"
#define DEFAULT_PROP_VALIGNMENT GES_TEXT_VALIGN_BASELINE
#define DEFAULT_PROP_HALIGNMENT GES_TEXT_HALIGN_CENTER
#
struct _GESTimelineTextOverlayPrivate
{
/* Dummy variable */
void *nothing;
};
enum
{
PROP_0,
PROP_TEXT,
PROP_FONT_DESC,
PROP_HALIGNMENT,
PROP_VALIGNMENT,
};
static void
ges_tl_text_overlay_set_text (GESTimelineTextOverlay * self,
const gchar * text);
static void
ges_tl_text_overlay_set_font_desc (GESTimelineTextOverlay * self, const gchar *
font_desc);
static void
ges_tl_text_overlay_set_valign (GESTimelineTextOverlay * self,
GESTextVAlign valign);
static void
ges_tl_text_overlay_set_halign (GESTimelineTextOverlay * self,
GESTextHAlign halign);
static GESTrackObject
* ges_tl_text_overlay_create_track_object (GESTimelineObject * obj,
GESTrack * track);
static void
ges_tl_text_overlay_get_property (GObject * object, guint property_id,
GValue * value, GParamSpec * pspec)
{
GESTimelineTextOverlay *tfs = GES_TIMELINE_TEXT_OVERLAY (object);
switch (property_id) {
case PROP_TEXT:
g_value_set_string (value, tfs->text);
break;
case PROP_FONT_DESC:
g_value_set_string (value, tfs->font_desc);
break;
case PROP_HALIGNMENT:
g_value_set_enum (value, tfs->halign);
break;
case PROP_VALIGNMENT:
g_value_set_enum (value, tfs->valign);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}
}
static void
ges_tl_text_overlay_set_property (GObject * object, guint property_id,
const GValue * value, GParamSpec * pspec)
{
GESTimelineTextOverlay *tfs = GES_TIMELINE_TEXT_OVERLAY (object);
switch (property_id) {
case PROP_TEXT:
ges_tl_text_overlay_set_text (tfs, g_value_get_string (value));
break;
case PROP_FONT_DESC:
ges_tl_text_overlay_set_font_desc (tfs, g_value_get_string (value));
break;
case PROP_HALIGNMENT:
ges_tl_text_overlay_set_halign (tfs, g_value_get_enum (value));
break;
case PROP_VALIGNMENT:
ges_tl_text_overlay_set_valign (tfs, g_value_get_enum (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}
}
static void
ges_tl_text_overlay_dispose (GObject * object)
{
GESTimelineTextOverlay *self = GES_TIMELINE_TEXT_OVERLAY (object);
if (self->text)
g_free (self->text);
if (self->font_desc)
g_free (self->font_desc);
G_OBJECT_CLASS (ges_tl_text_overlay_parent_class)->dispose (object);
}
static void
ges_tl_text_overlay_class_init (GESTimelineTextOverlayClass * klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GESTimelineObjectClass *timobj_class = GES_TIMELINE_OBJECT_CLASS (klass);
g_type_class_add_private (klass, sizeof (GESTimelineTextOverlayPrivate));
object_class->get_property = ges_tl_text_overlay_get_property;
object_class->set_property = ges_tl_text_overlay_set_property;
object_class->dispose = ges_tl_text_overlay_dispose;
/**
* GESTimelineTextOverlay: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));
/**
* GESTimelineTextOverlay: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));
/**
* GESTimelineTextOverlay: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));
/**
* GESTimelineTextOverlay: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",
GES_TEXT_HALIGN_TYPE, DEFAULT_PROP_HALIGNMENT,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
timobj_class->create_track_object = ges_tl_text_overlay_create_track_object;
timobj_class->need_fill_track = FALSE;
}
static void
ges_tl_text_overlay_init (GESTimelineTextOverlay * self)
{
self->priv = G_TYPE_INSTANCE_GET_PRIVATE (self,
GES_TYPE_TIMELINE_TEXT_OVERLAY, GESTimelineTextOverlayPrivate);
GES_TIMELINE_OBJECT (self)->duration = 0;
/* Not 100% needed since gobject contents are memzero'd when created */
self->text = NULL;
self->font_desc = NULL;
self->halign = DEFAULT_PROP_HALIGNMENT;
self->valign = DEFAULT_PROP_VALIGNMENT;
}
static void
ges_tl_text_overlay_set_text (GESTimelineTextOverlay * self, const gchar * text)
{
GList *tmp, *trackobjects;
GESTimelineObject *object = (GESTimelineObject *) self;
GST_DEBUG ("self:%p, text:%s", self, text);
if (self->text)
g_free (self->text);
self->text = g_strdup (text);
trackobjects = ges_timeline_object_get_track_objects (object);
for (tmp = trackobjects; tmp; tmp = tmp->next) {
GESTrackObject *trackobject = (GESTrackObject *) tmp->data;
if (trackobject->track->type == GES_TRACK_TYPE_VIDEO)
ges_track_text_overlay_set_text (GES_TRACK_TEXT_OVERLAY
(trackobject), self->text);
g_object_unref (GES_TRACK_OBJECT (tmp->data));
}
g_list_free (trackobjects);
}
static void
ges_tl_text_overlay_set_font_desc (GESTimelineTextOverlay * self, const gchar *
font_desc)
{
GList *tmp, *trackobjects;
GESTimelineObject *object = (GESTimelineObject *) self;
GST_DEBUG ("self:%p, font_desc:%s", self, font_desc);
if (self->font_desc)
g_free (self->font_desc);
self->font_desc = g_strdup (font_desc);
trackobjects = ges_timeline_object_get_track_objects (object);
for (tmp = trackobjects; tmp; tmp = tmp->next) {
GESTrackObject *trackobject = (GESTrackObject *) tmp->data;
if (trackobject->track->type == GES_TRACK_TYPE_VIDEO)
ges_track_text_overlay_set_font_desc (GES_TRACK_TEXT_OVERLAY
(trackobject), self->font_desc);
g_object_unref (GES_TRACK_OBJECT (tmp->data));
}
g_list_free (trackobjects);
}
static void
ges_tl_text_overlay_set_halign (GESTimelineTextOverlay * self,
GESTextHAlign halign)
{
GList *tmp, *trackobjects;
GESTimelineObject *object = (GESTimelineObject *) self;
GST_DEBUG ("self:%p, halign:%d", self, halign);
self->halign = halign;
trackobjects = ges_timeline_object_get_track_objects (object);
for (tmp = trackobjects; tmp; tmp = tmp->next) {
GESTrackObject *trackobject = (GESTrackObject *) tmp->data;
if (trackobject->track->type == GES_TRACK_TYPE_VIDEO)
ges_track_text_overlay_set_halignment (GES_TRACK_TEXT_OVERLAY
(trackobject), self->halign);
g_object_unref (GES_TRACK_OBJECT (tmp->data));
}
g_list_free (trackobjects);
}
static void
ges_tl_text_overlay_set_valign (GESTimelineTextOverlay * self,
GESTextVAlign valign)
{
GList *tmp, *trackobjects;
GESTimelineObject *object = (GESTimelineObject *) self;
GST_DEBUG ("self:%p, valign:%d", self, valign);
self->valign = valign;
trackobjects = ges_timeline_object_get_track_objects (object);
for (tmp = trackobjects; tmp; tmp = tmp->next) {
GESTrackObject *trackobject = (GESTrackObject *) tmp->data;
if (trackobject->track->type == GES_TRACK_TYPE_VIDEO)
ges_track_text_overlay_set_valignment (GES_TRACK_TEXT_OVERLAY
(trackobject), self->valign);
g_object_unref (GES_TRACK_OBJECT (tmp->data));
}
g_list_free (trackobjects);
}
static GESTrackObject *
ges_tl_text_overlay_create_track_object (GESTimelineObject * obj,
GESTrack * track)
{
GESTimelineTextOverlay *tfs = (GESTimelineTextOverlay *) obj;
GESTrackObject *res = NULL;
GST_DEBUG ("Creating a GESTrackOverlay");
if (track->type == GES_TRACK_TYPE_VIDEO) {
res = (GESTrackObject *) ges_track_text_overlay_new ();
GST_DEBUG ("Setting text property");
ges_track_text_overlay_set_text ((GESTrackTextOverlay *) res, tfs->text);
ges_track_text_overlay_set_font_desc ((GESTrackTextOverlay *) res,
tfs->font_desc);
ges_track_text_overlay_set_halignment ((GESTrackTextOverlay *) res,
tfs->halign);
ges_track_text_overlay_set_valignment ((GESTrackTextOverlay *) res,
tfs->valign);
}
return res;
}
/**
* ges_timeline_titlesource_new:
*
* Creates a new #GESTimelineTextOverlay
*
* Returns: The newly created #GESTimelineTextOverlay, or NULL if there was an
* error.
*/
GESTimelineTextOverlay *
ges_timeline_text_overlay_new (void)
{
/* FIXME : Check for validity/existence of URI */
return g_object_new (GES_TYPE_TIMELINE_TEXT_OVERLAY, NULL);
}