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199 lines
7.3 KiB
C
199 lines
7.3 KiB
C
/* GStreamer
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* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
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* Copyright (C) <2003> David Schleef <ds@schleef.org>
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* Copyright (C) <2006> Julien Moutte <julien@moutte.net>
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* Copyright (C) <2006> Zeeshan Ali <zeeshan.ali@nokia.com>
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* Copyright (C) <2006-2008> Tim-Philipp Müller <tim centricular net>
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* Copyright (C) <2009> Young-Ho Cha <ganadist@gmail.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef __GST_BASE_TEXT_OVERLAY_H__
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#define __GST_BASE_TEXT_OVERLAY_H__
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#include <gst/gst.h>
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#include <gst/video/video.h>
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#include <gst/video/video-overlay-composition.h>
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#include <pango/pangocairo.h>
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G_BEGIN_DECLS
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#define GST_TYPE_BASE_TEXT_OVERLAY (gst_base_text_overlay_get_type())
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#define GST_BASE_TEXT_OVERLAY(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),\
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GST_TYPE_BASE_TEXT_OVERLAY, GstBaseTextOverlay))
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#define GST_BASE_TEXT_OVERLAY_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),\
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GST_TYPE_BASE_TEXT_OVERLAY,GstBaseTextOverlayClass))
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#define GST_BASE_TEXT_OVERLAY_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj),\
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GST_TYPE_BASE_TEXT_OVERLAY, GstBaseTextOverlayClass))
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#define GST_IS_BASE_TEXT_OVERLAY(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),\
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GST_TYPE_BASE_TEXT_OVERLAY))
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#define GST_IS_BASE_TEXT_OVERLAY_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass),\
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GST_TYPE_BASE_TEXT_OVERLAY))
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typedef struct _GstBaseTextOverlay GstBaseTextOverlay;
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typedef struct _GstBaseTextOverlayClass GstBaseTextOverlayClass;
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/**
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* GstBaseTextOverlayVAlign:
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* @GST_BASE_TEXT_OVERLAY_VALIGN_BASELINE: draw text on the baseline
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* @GST_BASE_TEXT_OVERLAY_VALIGN_BOTTOM: draw text on the bottom
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* @GST_BASE_TEXT_OVERLAY_VALIGN_TOP: draw text on top
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* @GST_BASE_TEXT_OVERLAY_VALIGN_POS: draw text according to the #GstBaseTextOverlay:ypos property
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* @GST_BASE_TEXT_OVERLAY_VALIGN_CENTER: draw text vertically centered
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*
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* Vertical alignment of the text.
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*/
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typedef enum {
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GST_BASE_TEXT_OVERLAY_VALIGN_BASELINE,
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GST_BASE_TEXT_OVERLAY_VALIGN_BOTTOM,
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GST_BASE_TEXT_OVERLAY_VALIGN_TOP,
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GST_BASE_TEXT_OVERLAY_VALIGN_POS,
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GST_BASE_TEXT_OVERLAY_VALIGN_CENTER
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} GstBaseTextOverlayVAlign;
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/**
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* GstBaseTextOverlayHAlign:
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* @GST_BASE_TEXT_OVERLAY_HALIGN_LEFT: align text left
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* @GST_BASE_TEXT_OVERLAY_HALIGN_CENTER: align text center
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* @GST_BASE_TEXT_OVERLAY_HALIGN_RIGHT: align text right
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* @GST_BASE_TEXT_OVERLAY_HALIGN_POS: position text according to the #GstBaseTextOverlay:xpos property
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*
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* Horizontal alignment of the text.
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*/
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/* FIXME 0.11: remove GST_BASE_TEXT_OVERLAY_HALIGN_UNUSED */
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typedef enum {
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GST_BASE_TEXT_OVERLAY_HALIGN_LEFT,
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GST_BASE_TEXT_OVERLAY_HALIGN_CENTER,
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GST_BASE_TEXT_OVERLAY_HALIGN_RIGHT,
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GST_BASE_TEXT_OVERLAY_HALIGN_UNUSED,
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GST_BASE_TEXT_OVERLAY_HALIGN_POS
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} GstBaseTextOverlayHAlign;
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/**
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* GstBaseTextOverlayWrapMode:
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* @GST_BASE_TEXT_OVERLAY_WRAP_MODE_NONE: no wrapping
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* @GST_BASE_TEXT_OVERLAY_WRAP_MODE_WORD: do word wrapping
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* @GST_BASE_TEXT_OVERLAY_WRAP_MODE_CHAR: do char wrapping
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* @GST_BASE_TEXT_OVERLAY_WRAP_MODE_WORD_CHAR: do word and char wrapping
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*
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* Whether to wrap the text and if so how.
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*/
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typedef enum {
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GST_BASE_TEXT_OVERLAY_WRAP_MODE_NONE = -1,
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GST_BASE_TEXT_OVERLAY_WRAP_MODE_WORD = PANGO_WRAP_WORD,
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GST_BASE_TEXT_OVERLAY_WRAP_MODE_CHAR = PANGO_WRAP_CHAR,
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GST_BASE_TEXT_OVERLAY_WRAP_MODE_WORD_CHAR = PANGO_WRAP_WORD_CHAR
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} GstBaseTextOverlayWrapMode;
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/**
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* GstBaseTextOverlayLineAlign:
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* @GST_BASE_TEXT_OVERLAY_LINE_ALIGN_LEFT: lines are left-aligned
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* @GST_BASE_TEXT_OVERLAY_LINE_ALIGN_CENTER: lines are center-aligned
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* @GST_BASE_TEXT_OVERLAY_LINE_ALIGN_RIGHT: lines are right-aligned
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*
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* Alignment of text lines relative to each other
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*/
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typedef enum {
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GST_BASE_TEXT_OVERLAY_LINE_ALIGN_LEFT = PANGO_ALIGN_LEFT,
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GST_BASE_TEXT_OVERLAY_LINE_ALIGN_CENTER = PANGO_ALIGN_CENTER,
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GST_BASE_TEXT_OVERLAY_LINE_ALIGN_RIGHT = PANGO_ALIGN_RIGHT
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} GstBaseTextOverlayLineAlign;
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/**
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* GstBaseTextOverlay:
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*
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* Opaque textoverlay object structure
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*/
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struct _GstBaseTextOverlay {
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GstElement element;
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GstPad *video_sinkpad;
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GstPad *text_sinkpad;
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GstPad *srcpad;
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GstSegment segment;
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GstSegment text_segment;
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GstBuffer *text_buffer;
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gboolean text_linked;
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gboolean video_flushing;
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gboolean video_eos;
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gboolean text_flushing;
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gboolean text_eos;
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GMutex lock;
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GCond cond; /* to signal removal of a queued text
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* buffer, arrival of a text buffer,
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* a text segment update, or a change
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* in status (e.g. shutdown, flushing) */
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GstVideoInfo info;
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GstVideoFormat format;
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gint width;
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gint height;
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GstBaseTextOverlayVAlign valign;
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GstBaseTextOverlayHAlign halign;
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GstBaseTextOverlayWrapMode wrap_mode;
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GstBaseTextOverlayLineAlign line_align;
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gint xpad;
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gint ypad;
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gint deltax;
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gint deltay;
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gdouble xpos;
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gdouble ypos;
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gchar *default_text;
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gboolean want_shading;
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gboolean silent;
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gboolean wait_text;
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guint color, outline_color;
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PangoLayout *layout;
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gdouble shadow_offset;
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gdouble outline_offset;
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GstBuffer *text_image;
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gint image_width;
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gint image_height;
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gint baseline_y;
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gboolean auto_adjust_size;
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gboolean need_render;
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gint shading_value; /* for timeoverlay subclass */
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gboolean have_pango_markup;
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gboolean use_vertical_render;
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gboolean attach_compo_to_buffer;
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GstVideoOverlayComposition *composition;
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};
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struct _GstBaseTextOverlayClass {
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GstElementClass parent_class;
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PangoContext *pango_context;
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GMutex *pango_lock;
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gchar * (*get_text) (GstBaseTextOverlay *overlay, GstBuffer *video_frame);
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};
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GType gst_base_text_overlay_get_type(void) G_GNUC_CONST;
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G_END_DECLS
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#endif /* __GST_BASE_TEXT_OVERLAY_H */
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