gstreamer/ges/ges-text-overlay.c

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/* 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
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
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*/
/**
* SECTION:ges-text-overlay
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* @short_description: render text onto another video stream in a
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* #GESLayer
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*
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*/
#include "ges-internal.h"
#include "ges-track-element.h"
#include "ges-title-source.h"
#include "ges-text-overlay.h"
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G_DEFINE_TYPE (GESTextOverlay, ges_text_overlay, GES_TYPE_OPERATION);
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struct _GESTextOverlayPrivate
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{
gchar *text;
gchar *font_desc;
GESTextHAlign halign;
GESTextVAlign valign;
guint32 color;
gdouble xpos;
gdouble ypos;
GstElement *text_el;
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};
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enum
{
PROP_0,
};
static void ges_text_overlay_dispose (GObject * object);
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static void ges_text_overlay_finalize (GObject * object);
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static void ges_text_overlay_get_property (GObject * object, guint
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property_id, GValue * value, GParamSpec * pspec);
static void ges_text_overlay_set_property (GObject * object, guint
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property_id, const GValue * value, GParamSpec * pspec);
static GstElement *ges_text_overlay_create_element (GESTrackElement * self);
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static void
ges_text_overlay_class_init (GESTextOverlayClass * klass)
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{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GESTrackElementClass *bg_class = GES_TRACK_ELEMENT_CLASS (klass);
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g_type_class_add_private (klass, sizeof (GESTextOverlayPrivate));
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object_class->get_property = ges_text_overlay_get_property;
object_class->set_property = ges_text_overlay_set_property;
object_class->dispose = ges_text_overlay_dispose;
object_class->finalize = ges_text_overlay_finalize;
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bg_class->create_element = ges_text_overlay_create_element;
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}
static void
ges_text_overlay_init (GESTextOverlay * self)
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{
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self->priv = G_TYPE_INSTANCE_GET_PRIVATE (self,
GES_TYPE_TEXT_OVERLAY, GESTextOverlayPrivate);
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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->color = G_MAXUINT32;
self->priv->xpos = 0.5;
self->priv->ypos = 0.5;
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}
static void
ges_text_overlay_dispose (GObject * object)
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{
GESTextOverlay *self = GES_TEXT_OVERLAY (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) {
gst_object_unref (self->priv->text_el);
self->priv->text_el = NULL;
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}
G_OBJECT_CLASS (ges_text_overlay_parent_class)->dispose (object);
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}
static void
ges_text_overlay_finalize (GObject * object)
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{
G_OBJECT_CLASS (ges_text_overlay_parent_class)->finalize (object);
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}
static void
ges_text_overlay_get_property (GObject * object,
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guint property_id, GValue * value, GParamSpec * pspec)
{
switch (property_id) {
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}
}
static void
ges_text_overlay_set_property (GObject * object,
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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_text_overlay_create_element (GESTrackElement * track_element)
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{
GstElement *ret, *text, *iconv, *oconv;
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GstPad *src_target, *sink_target;
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GstPad *src, *sink;
GESTextOverlay *self = GES_TEXT_OVERLAY (track_element);
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text = gst_element_factory_make ("textoverlay", NULL);
iconv = gst_element_factory_make ("videoconvert", NULL);
oconv = gst_element_factory_make ("videoconvert", NULL);
self->priv->text_el = text;
gst_object_ref (text);
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if (self->priv->text)
g_object_set (text, "text", (gchar *) self->priv->text, NULL);
if (self->priv->font_desc)
g_object_set (text, "font-desc", (gchar *) self->priv->font_desc, NULL);
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g_object_set (text, "halignment", (gint) self->priv->halign, "valignment",
(gint) self->priv->valign, NULL);
g_object_set (text, "color", (guint) self->priv->color, NULL);
g_object_set (text, "xpos", (gdouble) self->priv->xpos, NULL);
g_object_set (text, "ypos", (gdouble) self->priv->ypos, NULL);
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ret = gst_bin_new ("overlay-bin");
gst_bin_add_many (GST_BIN (ret), text, iconv, oconv, NULL);
gst_element_link_many (iconv, text, oconv, NULL);
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src_target = gst_element_get_static_pad (oconv, "src");
sink_target = gst_element_get_static_pad (iconv, "sink");
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src = gst_ghost_pad_new ("src", src_target);
sink = gst_ghost_pad_new ("video_sink", sink_target);
gst_object_unref (src_target);
gst_object_unref (sink_target);
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gst_element_add_pad (ret, src);
gst_element_add_pad (ret, sink);
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return ret;
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}
/**
* ges_text_overlay_set_text:
* @self: the #GESTextOverlay* 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 element will render.
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*
*/
void
ges_text_overlay_set_text (GESTextOverlay * self, const gchar * text)
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{
GST_DEBUG ("self:%p, text:%s", self, text);
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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}
/**
* ges_text_overlay_set_font_desc:
* @self: the #GESTextOverlay
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* @font_desc: the pango font description
*
* Sets the pango font description of the text this track element
* will render.
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*
*/
void
ges_text_overlay_set_font_desc (GESTextOverlay * self, const gchar * font_desc)
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{
GST_DEBUG ("self:%p, font_desc:%s", self, 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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}
/**
* ges_text_overlay_set_valignment:
* @self: the #GESTextOverlay* to set text on
* @valign: The #GESTextVAlign defining the vertical alignment
* of the text render by @self.
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*
* Sets the vertical aligment of the text.
*
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*/
void
ges_text_overlay_set_valignment (GESTextOverlay * self, GESTextVAlign valign)
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{
GST_DEBUG ("self:%p, halign:%d", self, valign);
self->priv->valign = valign;
if (self->priv->text_el)
g_object_set (self->priv->text_el, "valignment", valign, NULL);
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}
/**
* ges_text_overlay_set_halignment:
* @self: the #GESTextOverlay* to set text on
* @halign: The #GESTextHAlign defining the horizontal alignment
* of the text render by @self.
*
* Sets the horizontal aligment of the text.
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*
*/
void
ges_text_overlay_set_halignment (GESTextOverlay * self, GESTextHAlign halign)
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{
GST_DEBUG ("self:%p, halign:%d", self, halign);
self->priv->halign = halign;
if (self->priv->text_el)
g_object_set (self->priv->text_el, "halignment", halign, NULL);
}
/**
* ges_text_overlay_set_color:
* @self: the #GESTextOverlay* to set
* @color: The color @self is being set to
*
* Sets the color of the text.
*/
void
ges_text_overlay_set_color (GESTextOverlay * self, guint32 color)
{
GST_DEBUG ("self:%p, color:%d", self, color);
self->priv->color = color;
if (self->priv->text_el)
g_object_set (self->priv->text_el, "color", color, NULL);
}
/**
* ges_text_overlay_set_xpos:
* @self: the #GESTextOverlay* to set
* @position: The horizontal position @self is being set to
*
* Sets the horizontal position of the text.
*/
void
ges_text_overlay_set_xpos (GESTextOverlay * self, gdouble position)
{
GST_DEBUG ("self:%p, xpos:%f", self, position);
self->priv->xpos = position;
if (self->priv->text_el)
g_object_set (self->priv->text_el, "xpos", position, NULL);
}
/**
* ges_text_overlay_set_ypos:
* @self: the #GESTextOverlay* to set
* @position: The vertical position @self is being set to
*
* Sets the vertical position of the text.
*/
void
ges_text_overlay_set_ypos (GESTextOverlay * self, gdouble position)
{
GST_DEBUG ("self:%p, ypos:%f", self, position);
self->priv->ypos = position;
if (self->priv->text_el)
g_object_set (self->priv->text_el, "ypos", position, NULL);
}
/**
* ges_text_overlay_get_text:
* @self: a GESTextOverlay
*
* Get the text currently set on @source.
*
* Returns: The text currently set on @source.
*/
const gchar *
ges_text_overlay_get_text (GESTextOverlay * self)
{
return self->priv->text;
}
/**
* ges_text_overlay_get_font_desc:
* @self: a GESTextOverlay
*
* Get the pango font description currently set on @source.
*
* Returns: The pango font description currently set on @source.
*/
const char *
ges_text_overlay_get_font_desc (GESTextOverlay * self)
{
return self->priv->font_desc;
}
/**
* ges_text_overlay_get_halignment:
* @self: a GESTextOverlay
*
* Get the horizontal aligment used by @source.
*
* Returns: The horizontal aligment used by @source.
*/
GESTextHAlign
ges_text_overlay_get_halignment (GESTextOverlay * self)
{
return self->priv->halign;
}
/**
* ges_text_overlay_get_valignment:
* @self: a GESTextOverlay
*
* Get the vertical aligment used by @source.
*
* Returns: The vertical aligment used by @source.
*/
GESTextVAlign
ges_text_overlay_get_valignment (GESTextOverlay * self)
{
return self->priv->valign;
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}
/**
* ges_text_overlay_get_color:
* @self: a GESTextOverlay
*
* Get the color used by @source.
*
* Returns: The color used by @source.
*/
const guint32
ges_text_overlay_get_color (GESTextOverlay * self)
{
return self->priv->color;
}
/**
* ges_text_overlay_get_xpos:
* @self: a GESTextOverlay
*
* Get the horizontal position used by @source.
*
* Returns: The horizontal position used by @source.
*/
const gdouble
ges_text_overlay_get_xpos (GESTextOverlay * self)
{
return self->priv->xpos;
}
/**
* ges_text_overlay_get_ypos:
* @self: a GESTextOverlay
*
* Get the vertical position used by @source.
*
* Returns: The vertical position used by @source.
*/
const gdouble
ges_text_overlay_get_ypos (GESTextOverlay * self)
{
return self->priv->ypos;
}
/**
* ges_text_overlay_new:
*
* Creates a new #GESTextOverlay.
*
* Returns: The newly created #GESTextOverlay or %NULL if something went
* wrong.
*/
GESTextOverlay *
ges_text_overlay_new (void)
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{
return g_object_new (GES_TYPE_TEXT_OVERLAY, "track-type",
GES_TRACK_TYPE_VIDEO, NULL);
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}