gstreamer/ges/ges-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
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
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*/
/**
* SECTION:gestitlesource
* @title: GESTitleSource
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* @short_description: render stand-alone text titles
*
* #GESTitleSource is a GESTimelineElement that implements the notion
* of titles in GES.
*
* ## Children Properties
*
* You can use the following children properties through the
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* #ges_timeline_element_set_child_property and alike set of methods:
*
* - #gchar `text`: The text to be rendered
* - #guint `background`: The color of the background
* - #guint `color`: The color of the text
* - #gchar `font-desc`: Pango font description string
* - #GESTextHAlign `halignment`: Horizontal alignment of the text
* - #GESTextVAlign `valignment`: Vertical alignent of the text
* - #gdouble `xpos`: The horizontal position of the text
* - #gdouble `ypos`: The vertical position of the text
* - #gboolean `shaded-background`: Whether to shade the background under the text area
* - #guint `outline-color`: Color to use for outline the text (big-endian ARGB).
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*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
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#include "ges-internal.h"
#include "ges-track-element.h"
#include "ges-title-source.h"
#include "ges-video-test-source.h"
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#define DEFAULT_TEXT ""
#define DEFAULT_FONT_DESC "Serif 36"
struct _GESTitleSourcePrivate
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{
gchar *text;
gchar *font_desc;
GESTextHAlign halign;
GESTextVAlign valign;
guint32 color;
guint32 background;
gdouble xpos;
gdouble ypos;
GstElement *text_el;
GstElement *background_el;
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};
G_DEFINE_TYPE_WITH_PRIVATE (GESTitleSource, ges_title_source,
GES_TYPE_VIDEO_SOURCE);
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enum
{
PROP_0,
};
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static void ges_title_source_dispose (GObject * object);
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static void ges_title_source_get_property (GObject * object, guint
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property_id, GValue * value, GParamSpec * pspec);
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static void ges_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_title_source_create_source (GESTrackElement * self);
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static gboolean
_lookup_child (GESTimelineElement * object,
const gchar * prop_name, GObject ** element, GParamSpec ** pspec)
{
gboolean res;
gchar *clean_name;
if (!g_strcmp0 (prop_name, "background"))
clean_name = g_strdup ("foreground-color");
else if (!g_strcmp0 (prop_name, "GstTextOverlay:background"))
clean_name = g_strdup ("foreground-color");
else
clean_name = g_strdup (prop_name);
res =
GES_TIMELINE_ELEMENT_CLASS (ges_title_source_parent_class)->lookup_child
(object, clean_name, element, pspec);
g_free (clean_name);
return res;
}
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static void
ges_title_source_class_init (GESTitleSourceClass * klass)
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{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GESVideoSourceClass *source_class = GES_VIDEO_SOURCE_CLASS (klass);
GESTimelineElementClass *timeline_element_class =
GES_TIMELINE_ELEMENT_CLASS (klass);
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object_class->get_property = ges_title_source_get_property;
object_class->set_property = ges_title_source_set_property;
object_class->dispose = ges_title_source_dispose;
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timeline_element_class->lookup_child = _lookup_child;
source_class->ABI.abi.disable_scale_in_compositor = TRUE;
source_class->create_source = ges_title_source_create_source;
GES_TRACK_ELEMENT_CLASS_DEFAULT_HAS_INTERNAL_SOURCE (klass) = FALSE;
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}
static void
ges_title_source_init (GESTitleSource * self)
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{
self->priv = ges_title_source_get_instance_private (self);
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self->priv->text = g_strdup (DEFAULT_TEXT);
self->priv->font_desc = g_strdup (DEFAULT_FONT_DESC);
self->priv->text_el = NULL;
self->priv->halign = DEFAULT_HALIGNMENT;
self->priv->valign = DEFAULT_VALIGNMENT;
self->priv->color = G_MAXUINT32;
self->priv->background = G_MAXUINT32;
self->priv->xpos = 0.5;
self->priv->ypos = 0.5;
self->priv->background_el = NULL;
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}
static void
ges_title_source_dispose (GObject * object)
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{
GESTitleSource *self = GES_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) {
gst_object_unref (self->priv->text_el);
self->priv->text_el = NULL;
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}
if (self->priv->background_el) {
gst_object_unref (self->priv->background_el);
self->priv->background_el = NULL;
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}
G_OBJECT_CLASS (ges_title_source_parent_class)->dispose (object);
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}
static void
ges_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_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_title_source_create_source (GESTrackElement * object)
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{
GstElement *topbin, *background, *text;
GstPad *src, *pad;
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GESTitleSource *self = GES_TITLE_SOURCE (object);
GESTitleSourcePrivate *priv = self->priv;
const gchar *bg_props[] = { "pattern", "foreground-color", NULL };
const gchar *text_props[] = { "text", "font-desc", "valignment", "halignment",
"color", "xpos", "ypos", "x-absolute", "y-absolute", "outline-color",
"shaded-background",
"text-x", "text-y", "text-width", "text-height", NULL
};
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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);
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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g_object_set (background, "pattern", (gint) GES_VIDEO_TEST_PATTERN_SOLID,
NULL);
g_object_set (background, "foreground-color", (guint) self->priv->background,
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NULL);
gst_bin_add_many (GST_BIN (topbin), background, text, NULL);
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gst_element_link_pads_full (background, "src", text, "video_sink",
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GST_PAD_LINK_CHECK_NOTHING);
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pad = gst_element_get_static_pad (text, "src");
src = gst_ghost_pad_new ("src", pad);
gst_object_unref (pad);
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gst_element_add_pad (topbin, src);
gst_object_ref (text);
gst_object_ref (background);
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priv->text_el = text;
priv->background_el = background;
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ges_track_element_add_children_props (object, text, NULL, NULL, text_props);
ges_track_element_add_children_props (object, background, NULL, NULL,
bg_props);
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return topbin;
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}
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/**
* ges_title_source_set_text:
* @self: the #GESTitleSource* 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.
*
* Deprecated: use ges_track_element_get/set_children_properties on the
* GESTrackElement instead
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*/
void
ges_title_source_set_text (GESTitleSource * self, const gchar * text)
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{
if (self->priv->text)
g_free (self->priv->text);
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GST_DEBUG ("self:%p, text:%s", self, text);
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_title_source_set_font_desc:
* @self: the #GESTitleSource
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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_title_source_set_font_desc (GESTitleSource * self, const gchar * font_desc)
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{
if (self->priv->font_desc)
g_free (self->priv->font_desc);
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GST_DEBUG ("self:%p, font_dec:%s", self, font_desc);
self->priv->font_desc = g_strdup (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_title_source_set_valignment:
* @self: the #GESTitleSource* to set text on
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* @valign: #GESTextVAlign
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*
* Sets the vertical aligment of the text.
*/
void
ges_title_source_set_valignment (GESTitleSource * self, GESTextVAlign valign)
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{
GST_DEBUG ("self:%p, valign:%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_title_source_set_halignment:
* @self: the #GESTitleSource* to set text on
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* @halign: #GESTextHAlign
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*
* Sets the vertical aligment of the text.
*/
void
ges_title_source_set_halignment (GESTitleSource * 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_title_source_set_text_color:
* @self: the #GESTitleSource* to set
* @color: the color @self is being set to
*
* Sets the color of the text.
*/
void
ges_title_source_set_text_color (GESTitleSource * 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_title_source_set_background_color:
* @self: the #GESTitleSource* to set
* @color: the color @self is being set to
*
* Sets the color of the background
*/
void
ges_title_source_set_background_color (GESTitleSource * self, guint32 color)
{
GST_DEBUG ("self:%p, background color:%d", self, color);
self->priv->background = color;
if (self->priv->background_el)
g_object_set (self->priv->background_el, "foreground-color", color, NULL);
}
/**
* ges_title_source_set_xpos:
* @self: the #GESTitleSource* to set
* @position: the horizontal position @self is being set to
*
* Sets the horizontal position of the text.
*/
void
ges_title_source_set_xpos (GESTitleSource * 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_title_source_set_ypos:
* @self: the #GESTitleSource* to set
* @position: the color @self is being set to
*
* Sets the vertical position of the text.
*/
void
ges_title_source_set_ypos (GESTitleSource * 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_title_source_get_text:
* @source: a #GESTitleSource
*
* Get the text currently set on the @source.
*
* Returns: (transfer full): The text currently set on the @source.
*
* Deprecated: 1.16: Use ges_timeline_element_get_child_property instead
* (this actually returns a newly allocated string)
*/
const gchar *
ges_title_source_get_text (GESTitleSource * source)
{
gchar *text;
ges_track_element_get_child_properties (GES_TRACK_ELEMENT (source), "text",
&text, NULL);
return text;
}
/**
* ges_title_source_get_font_desc:
* @source: a #GESTitleSource
*
* Get the pango font description used by @source.
*
* Returns: (transfer full): The pango font description used by this
* @source.
*
* Deprecated: 1.16: Use ges_timeline_element_get_child_property instead
* (this actually returns a newly allocated string)
*/
const gchar *
ges_title_source_get_font_desc (GESTitleSource * source)
{
gchar *font_desc;
ges_track_element_get_child_properties (GES_TRACK_ELEMENT (source),
"font-desc", &font_desc, NULL);
return font_desc;
}
/**
* ges_title_source_get_halignment:
* @source: a #GESTitleSource
*
* Get the horizontal aligment used by @source.
*
* Returns: The horizontal aligment used by @source.
*/
GESTextHAlign
ges_title_source_get_halignment (GESTitleSource * source)
{
GESTextHAlign halign;
ges_track_element_get_child_properties (GES_TRACK_ELEMENT (source),
"halignment", &halign, NULL);
return halign;
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}
/**
* ges_title_source_get_valignment:
* @source: a #GESTitleSource
*
* Get the vertical aligment used by @source.
*
* Returns: The vertical aligment used by @source.
*/
GESTextVAlign
ges_title_source_get_valignment (GESTitleSource * source)
{
GESTextVAlign valign;
ges_track_element_get_child_properties (GES_TRACK_ELEMENT (source),
"valignment", &valign, NULL);
return valign;
}
/**
* ges_title_source_get_text_color:
* @source: a #GESTitleSource
*
* Get the color used by @source.
*
* Returns: The color used by @source.
*/
const guint32
ges_title_source_get_text_color (GESTitleSource * source)
{
guint32 color;
ges_track_element_get_child_properties (GES_TRACK_ELEMENT (source), "color",
&color, NULL);
return color;
}
/**
* ges_title_source_get_background_color:
* @source: a #GESTitleSource
*
* Get the background used by @source.
*
* Returns: The background used by @source.
*/
const guint32
ges_title_source_get_background_color (GESTitleSource * source)
{
guint32 color;
ges_track_element_get_child_properties (GES_TRACK_ELEMENT (source),
"foreground-color", &color, NULL);
return color;
}
/**
* ges_title_source_get_xpos:
* @source: a #GESTitleSource
*
* Get the horizontal position used by @source.
*
* Returns: The horizontal position used by @source.
*/
const gdouble
ges_title_source_get_xpos (GESTitleSource * source)
{
gdouble xpos;
ges_track_element_get_child_properties (GES_TRACK_ELEMENT (source), "xpos",
&xpos, NULL);
return xpos;
}
/**
* ges_title_source_get_ypos:
* @source: a #GESTitleSource
*
* Get the vertical position used by @source.
*
* Returns: The vertical position used by @source.
*/
const gdouble
ges_title_source_get_ypos (GESTitleSource * source)
{
gdouble ypos;
ges_track_element_get_child_properties (GES_TRACK_ELEMENT (source), "ypos",
&ypos, NULL);
return ypos;
}
/**
* ges_title_source_new:
*
* Creates a new #GESTitleSource.
*
* Returns: (transfer floating) (nullable): The newly created #GESTitleSource,
* or %NULL if there was an error.
*/
GESTitleSource *
ges_title_source_new (void)
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{
return g_object_new (GES_TYPE_TITLE_SOURCE, "track-type",
GES_TRACK_TYPE_VIDEO, NULL);
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}