/
gstbasetextoverlay.c
3074 lines (2646 loc) · 99.7 KB
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gstbasetextoverlay.c
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/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
* Copyright (C) <2003> David Schleef <ds@schleef.org>
* Copyright (C) <2006> Julien Moutte <julien@moutte.net>
* Copyright (C) <2006> Zeeshan Ali <zeeshan.ali@nokia.com>
* Copyright (C) <2006-2008> Tim-Philipp Müller <tim centricular net>
* Copyright (C) <2009> Young-Ho Cha <ganadist@gmail.com>
*
* 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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <gst/video/video.h>
#include <gst/video/gstvideometa.h>
#include "gstbasetextoverlay.h"
#include "gsttextoverlay.h"
#include "gsttimeoverlay.h"
#include "gstclockoverlay.h"
#include "gsttextrender.h"
#include <string.h>
#include <math.h>
/* FIXME:
* - use proper strides and offset for I420
* - if text is wider than the video picture, it does not get
* clipped properly during blitting (if wrapping is disabled)
*/
#define DEFAULT_PROP_TEXT ""
#define DEFAULT_PROP_SHADING FALSE
#define DEFAULT_PROP_VALIGNMENT GST_BASE_TEXT_OVERLAY_VALIGN_BASELINE
#define DEFAULT_PROP_HALIGNMENT GST_BASE_TEXT_OVERLAY_HALIGN_CENTER
#define DEFAULT_PROP_XPAD 25
#define DEFAULT_PROP_YPAD 25
#define DEFAULT_PROP_DELTAX 0
#define DEFAULT_PROP_DELTAY 0
#define DEFAULT_PROP_XPOS 0.5
#define DEFAULT_PROP_YPOS 0.5
#define DEFAULT_PROP_WRAP_MODE GST_BASE_TEXT_OVERLAY_WRAP_MODE_WORD_CHAR
#define DEFAULT_PROP_FONT_DESC ""
#define DEFAULT_PROP_SILENT FALSE
#define DEFAULT_PROP_LINE_ALIGNMENT GST_BASE_TEXT_OVERLAY_LINE_ALIGN_CENTER
#define DEFAULT_PROP_WAIT_TEXT TRUE
#define DEFAULT_PROP_AUTO_ADJUST_SIZE TRUE
#define DEFAULT_PROP_VERTICAL_RENDER FALSE
#define DEFAULT_PROP_SCALE_MODE GST_BASE_TEXT_OVERLAY_SCALE_MODE_NONE
#define DEFAULT_PROP_SCALE_PAR_N 1
#define DEFAULT_PROP_SCALE_PAR_D 1
#define DEFAULT_PROP_DRAW_SHADOW TRUE
#define DEFAULT_PROP_DRAW_OUTLINE TRUE
#define DEFAULT_PROP_COLOR 0xffffffff
#define DEFAULT_PROP_OUTLINE_COLOR 0xff000000
#define DEFAULT_PROP_SHADING_VALUE 80
#define DEFAULT_PROP_TEXT_X 0
#define DEFAULT_PROP_TEXT_Y 0
#define DEFAULT_PROP_TEXT_WIDTH 1
#define DEFAULT_PROP_TEXT_HEIGHT 1
#define MINIMUM_OUTLINE_OFFSET 1.0
#define DEFAULT_SCALE_BASIS 640
enum
{
PROP_0,
PROP_TEXT,
PROP_SHADING,
PROP_SHADING_VALUE,
PROP_HALIGNMENT,
PROP_VALIGNMENT,
PROP_XPAD,
PROP_YPAD,
PROP_DELTAX,
PROP_DELTAY,
PROP_XPOS,
PROP_YPOS,
PROP_X_ABSOLUTE,
PROP_Y_ABSOLUTE,
PROP_WRAP_MODE,
PROP_FONT_DESC,
PROP_SILENT,
PROP_LINE_ALIGNMENT,
PROP_WAIT_TEXT,
PROP_AUTO_ADJUST_SIZE,
PROP_VERTICAL_RENDER,
PROP_SCALE_MODE,
PROP_SCALE_PAR,
PROP_COLOR,
PROP_DRAW_SHADOW,
PROP_DRAW_OUTLINE,
PROP_OUTLINE_COLOR,
PROP_TEXT_X,
PROP_TEXT_Y,
PROP_TEXT_WIDTH,
PROP_TEXT_HEIGHT,
PROP_LAST
};
#define VIDEO_FORMATS GST_VIDEO_OVERLAY_COMPOSITION_BLEND_FORMATS
#define BASE_TEXT_OVERLAY_CAPS GST_VIDEO_CAPS_MAKE (VIDEO_FORMATS)
#define BASE_TEXT_OVERLAY_ALL_CAPS BASE_TEXT_OVERLAY_CAPS ";" \
GST_VIDEO_CAPS_MAKE_WITH_FEATURES ("ANY", GST_VIDEO_FORMATS_ALL)
static GstStaticCaps sw_template_caps =
GST_STATIC_CAPS (BASE_TEXT_OVERLAY_CAPS);
static GstStaticPadTemplate src_template_factory =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (BASE_TEXT_OVERLAY_ALL_CAPS)
);
static GstStaticPadTemplate video_sink_template_factory =
GST_STATIC_PAD_TEMPLATE ("video_sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (BASE_TEXT_OVERLAY_ALL_CAPS)
);
#define GST_TYPE_BASE_TEXT_OVERLAY_VALIGN (gst_base_text_overlay_valign_get_type())
static GType
gst_base_text_overlay_valign_get_type (void)
{
static GType base_text_overlay_valign_type = 0;
static const GEnumValue base_text_overlay_valign[] = {
{GST_BASE_TEXT_OVERLAY_VALIGN_BASELINE, "baseline", "baseline"},
{GST_BASE_TEXT_OVERLAY_VALIGN_BOTTOM, "bottom", "bottom"},
{GST_BASE_TEXT_OVERLAY_VALIGN_TOP, "top", "top"},
{GST_BASE_TEXT_OVERLAY_VALIGN_POS, "position",
"Absolute position clamped to canvas"},
{GST_BASE_TEXT_OVERLAY_VALIGN_CENTER, "center", "center"},
{GST_BASE_TEXT_OVERLAY_VALIGN_ABSOLUTE, "absolute", "Absolute position"},
{0, NULL, NULL},
};
if (!base_text_overlay_valign_type) {
base_text_overlay_valign_type =
g_enum_register_static ("GstBaseTextOverlayVAlign",
base_text_overlay_valign);
}
return base_text_overlay_valign_type;
}
#define GST_TYPE_BASE_TEXT_OVERLAY_HALIGN (gst_base_text_overlay_halign_get_type())
static GType
gst_base_text_overlay_halign_get_type (void)
{
static GType base_text_overlay_halign_type = 0;
static const GEnumValue base_text_overlay_halign[] = {
{GST_BASE_TEXT_OVERLAY_HALIGN_LEFT, "left", "left"},
{GST_BASE_TEXT_OVERLAY_HALIGN_CENTER, "center", "center"},
{GST_BASE_TEXT_OVERLAY_HALIGN_RIGHT, "right", "right"},
{GST_BASE_TEXT_OVERLAY_HALIGN_POS, "position",
"Absolute position clamped to canvas"},
{GST_BASE_TEXT_OVERLAY_HALIGN_ABSOLUTE, "absolute", "Absolute position"},
{0, NULL, NULL},
};
if (!base_text_overlay_halign_type) {
base_text_overlay_halign_type =
g_enum_register_static ("GstBaseTextOverlayHAlign",
base_text_overlay_halign);
}
return base_text_overlay_halign_type;
}
#define GST_TYPE_BASE_TEXT_OVERLAY_WRAP_MODE (gst_base_text_overlay_wrap_mode_get_type())
static GType
gst_base_text_overlay_wrap_mode_get_type (void)
{
static GType base_text_overlay_wrap_mode_type = 0;
static const GEnumValue base_text_overlay_wrap_mode[] = {
{GST_BASE_TEXT_OVERLAY_WRAP_MODE_NONE, "none", "none"},
{GST_BASE_TEXT_OVERLAY_WRAP_MODE_WORD, "word", "word"},
{GST_BASE_TEXT_OVERLAY_WRAP_MODE_CHAR, "char", "char"},
{GST_BASE_TEXT_OVERLAY_WRAP_MODE_WORD_CHAR, "wordchar", "wordchar"},
{0, NULL, NULL},
};
if (!base_text_overlay_wrap_mode_type) {
base_text_overlay_wrap_mode_type =
g_enum_register_static ("GstBaseTextOverlayWrapMode",
base_text_overlay_wrap_mode);
}
return base_text_overlay_wrap_mode_type;
}
#define GST_TYPE_BASE_TEXT_OVERLAY_LINE_ALIGN (gst_base_text_overlay_line_align_get_type())
static GType
gst_base_text_overlay_line_align_get_type (void)
{
static GType base_text_overlay_line_align_type = 0;
static const GEnumValue base_text_overlay_line_align[] = {
{GST_BASE_TEXT_OVERLAY_LINE_ALIGN_LEFT, "left", "left"},
{GST_BASE_TEXT_OVERLAY_LINE_ALIGN_CENTER, "center", "center"},
{GST_BASE_TEXT_OVERLAY_LINE_ALIGN_RIGHT, "right", "right"},
{0, NULL, NULL}
};
if (!base_text_overlay_line_align_type) {
base_text_overlay_line_align_type =
g_enum_register_static ("GstBaseTextOverlayLineAlign",
base_text_overlay_line_align);
}
return base_text_overlay_line_align_type;
}
#define GST_TYPE_BASE_TEXT_OVERLAY_SCALE_MODE (gst_base_text_overlay_scale_mode_get_type())
static GType
gst_base_text_overlay_scale_mode_get_type (void)
{
static GType base_text_overlay_scale_mode_type = 0;
static const GEnumValue base_text_overlay_scale_mode[] = {
{GST_BASE_TEXT_OVERLAY_SCALE_MODE_NONE, "none", "none"},
{GST_BASE_TEXT_OVERLAY_SCALE_MODE_PAR, "par", "par"},
{GST_BASE_TEXT_OVERLAY_SCALE_MODE_DISPLAY, "display", "display"},
{GST_BASE_TEXT_OVERLAY_SCALE_MODE_USER, "user", "user"},
{0, NULL, NULL}
};
if (!base_text_overlay_scale_mode_type) {
base_text_overlay_scale_mode_type =
g_enum_register_static ("GstBaseTextOverlayScaleMode",
base_text_overlay_scale_mode);
}
return base_text_overlay_scale_mode_type;
}
#define GST_BASE_TEXT_OVERLAY_GET_LOCK(ov) (&GST_BASE_TEXT_OVERLAY (ov)->lock)
#define GST_BASE_TEXT_OVERLAY_GET_COND(ov) (&GST_BASE_TEXT_OVERLAY (ov)->cond)
#define GST_BASE_TEXT_OVERLAY_LOCK(ov) (g_mutex_lock (GST_BASE_TEXT_OVERLAY_GET_LOCK (ov)))
#define GST_BASE_TEXT_OVERLAY_UNLOCK(ov) (g_mutex_unlock (GST_BASE_TEXT_OVERLAY_GET_LOCK (ov)))
#define GST_BASE_TEXT_OVERLAY_WAIT(ov) (g_cond_wait (GST_BASE_TEXT_OVERLAY_GET_COND (ov), GST_BASE_TEXT_OVERLAY_GET_LOCK (ov)))
#define GST_BASE_TEXT_OVERLAY_SIGNAL(ov) (g_cond_signal (GST_BASE_TEXT_OVERLAY_GET_COND (ov)))
#define GST_BASE_TEXT_OVERLAY_BROADCAST(ov)(g_cond_broadcast (GST_BASE_TEXT_OVERLAY_GET_COND (ov)))
static GstElementClass *parent_class = NULL;
static void gst_base_text_overlay_class_init (GstBaseTextOverlayClass * klass);
static void gst_base_text_overlay_init (GstBaseTextOverlay * overlay,
GstBaseTextOverlayClass * klass);
static GstStateChangeReturn gst_base_text_overlay_change_state (GstElement *
element, GstStateChange transition);
static GstCaps *gst_base_text_overlay_get_videosink_caps (GstPad * pad,
GstBaseTextOverlay * overlay, GstCaps * filter);
static GstCaps *gst_base_text_overlay_get_src_caps (GstPad * pad,
GstBaseTextOverlay * overlay, GstCaps * filter);
static gboolean gst_base_text_overlay_setcaps (GstBaseTextOverlay * overlay,
GstCaps * caps);
static gboolean gst_base_text_overlay_setcaps_txt (GstBaseTextOverlay * overlay,
GstCaps * caps);
static gboolean gst_base_text_overlay_src_event (GstPad * pad,
GstObject * parent, GstEvent * event);
static gboolean gst_base_text_overlay_src_query (GstPad * pad,
GstObject * parent, GstQuery * query);
static gboolean gst_base_text_overlay_video_event (GstPad * pad,
GstObject * parent, GstEvent * event);
static gboolean gst_base_text_overlay_video_query (GstPad * pad,
GstObject * parent, GstQuery * query);
static GstFlowReturn gst_base_text_overlay_video_chain (GstPad * pad,
GstObject * parent, GstBuffer * buffer);
static gboolean gst_base_text_overlay_text_event (GstPad * pad,
GstObject * parent, GstEvent * event);
static GstFlowReturn gst_base_text_overlay_text_chain (GstPad * pad,
GstObject * parent, GstBuffer * buffer);
static GstPadLinkReturn gst_base_text_overlay_text_pad_link (GstPad * pad,
GstObject * parent, GstPad * peer);
static void gst_base_text_overlay_text_pad_unlink (GstPad * pad,
GstObject * parent);
static void gst_base_text_overlay_pop_text (GstBaseTextOverlay * overlay);
static void gst_base_text_overlay_finalize (GObject * object);
static void gst_base_text_overlay_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_base_text_overlay_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static void
gst_base_text_overlay_adjust_values_with_fontdesc (GstBaseTextOverlay * overlay,
PangoFontDescription * desc);
static gboolean gst_base_text_overlay_can_handle_caps (GstCaps * incaps);
static void
gst_base_text_overlay_update_render_size (GstBaseTextOverlay * overlay);
GType
gst_base_text_overlay_get_type (void)
{
static GType type = 0;
if (g_once_init_enter ((gsize *) & type)) {
static const GTypeInfo info = {
sizeof (GstBaseTextOverlayClass),
(GBaseInitFunc) NULL,
NULL,
(GClassInitFunc) gst_base_text_overlay_class_init,
NULL,
NULL,
sizeof (GstBaseTextOverlay),
0,
(GInstanceInitFunc) gst_base_text_overlay_init,
};
g_once_init_leave ((gsize *) & type,
g_type_register_static (GST_TYPE_ELEMENT, "GstBaseTextOverlay", &info,
0));
}
return type;
}
static gchar *
gst_base_text_overlay_get_text (GstBaseTextOverlay * overlay,
GstBuffer * video_frame)
{
return g_strdup (overlay->default_text);
}
static void
gst_base_text_overlay_class_init (GstBaseTextOverlayClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
parent_class = g_type_class_peek_parent (klass);
gobject_class->finalize = gst_base_text_overlay_finalize;
gobject_class->set_property = gst_base_text_overlay_set_property;
gobject_class->get_property = gst_base_text_overlay_get_property;
gst_element_class_add_static_pad_template (gstelement_class,
&src_template_factory);
gst_element_class_add_static_pad_template (gstelement_class,
&video_sink_template_factory);
gstelement_class->change_state =
GST_DEBUG_FUNCPTR (gst_base_text_overlay_change_state);
klass->get_text = gst_base_text_overlay_get_text;
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_TEXT,
g_param_spec_string ("text", "text",
"Text to be display.", DEFAULT_PROP_TEXT,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_SHADING,
g_param_spec_boolean ("shaded-background", "shaded background",
"Whether to shade the background under the text area",
DEFAULT_PROP_SHADING, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_SHADING_VALUE,
g_param_spec_uint ("shading-value", "background shading value",
"Shading value to apply if shaded-background is true", 1, 255,
DEFAULT_PROP_SHADING_VALUE,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
GST_PARAM_DOC_SHOW_DEFAULT));
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_VALIGNMENT,
g_param_spec_enum ("valignment", "vertical alignment",
"Vertical alignment of the text", GST_TYPE_BASE_TEXT_OVERLAY_VALIGN,
DEFAULT_PROP_VALIGNMENT, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_HALIGNMENT,
g_param_spec_enum ("halignment", "horizontal alignment",
"Horizontal alignment of the text", GST_TYPE_BASE_TEXT_OVERLAY_HALIGN,
DEFAULT_PROP_HALIGNMENT,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
GST_PARAM_DOC_SHOW_DEFAULT));
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_XPAD,
g_param_spec_int ("xpad", "horizontal paddding",
"Horizontal paddding when using left/right alignment", 0, G_MAXINT,
DEFAULT_PROP_XPAD, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_YPAD,
g_param_spec_int ("ypad", "vertical padding",
"Vertical padding when using top/bottom alignment", 0, G_MAXINT,
DEFAULT_PROP_YPAD, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_DELTAX,
g_param_spec_int ("deltax", "X position modifier",
"Shift X position to the left or to the right. Unit is pixels.",
G_MININT, G_MAXINT, DEFAULT_PROP_DELTAX,
GST_PARAM_CONTROLLABLE | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_DELTAY,
g_param_spec_int ("deltay", "Y position modifier",
"Shift Y position up or down. Unit is pixels.", G_MININT, G_MAXINT,
DEFAULT_PROP_DELTAY,
GST_PARAM_CONTROLLABLE | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstBaseTextOverlay:text-x:
*
* Resulting X position of font rendering.
*/
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_TEXT_X,
g_param_spec_int ("text-x", "horizontal position.",
"Resulting X position of font rendering.", -G_MAXINT,
G_MAXINT, DEFAULT_PROP_TEXT_X, G_PARAM_READABLE));
/**
* GstBaseTextOverlay:text-y:
*
* Resulting Y position of font rendering.
*/
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_TEXT_Y,
g_param_spec_int ("text-y", "vertical position",
"Resulting X position of font rendering.", -G_MAXINT,
G_MAXINT, DEFAULT_PROP_TEXT_Y, G_PARAM_READABLE));
/**
* GstBaseTextOverlay:text-width:
*
* Resulting width of font rendering.
*/
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_TEXT_WIDTH,
g_param_spec_uint ("text-width", "width",
"Resulting width of font rendering",
0, G_MAXINT, DEFAULT_PROP_TEXT_WIDTH, G_PARAM_READABLE));
/**
* GstBaseTextOverlay:text-height:
*
* Resulting height of font rendering.
*/
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_TEXT_HEIGHT,
g_param_spec_uint ("text-height", "height",
"Resulting height of font rendering", 0,
G_MAXINT, DEFAULT_PROP_TEXT_HEIGHT, G_PARAM_READABLE));
/**
* GstBaseTextOverlay:xpos:
*
* Horizontal position of the rendered text when using positioned alignment.
*/
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_XPOS,
g_param_spec_double ("xpos", "horizontal position",
"Horizontal position when using clamped position alignment", 0, 1.0,
DEFAULT_PROP_XPOS,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
/**
* GstBaseTextOverlay:ypos:
*
* Vertical position of the rendered text when using positioned alignment.
*/
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_YPOS,
g_param_spec_double ("ypos", "vertical position",
"Vertical position when using clamped position alignment", 0, 1.0,
DEFAULT_PROP_YPOS,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
/**
* GstBaseTextOverlay:x-absolute:
*
* Horizontal position of the rendered text when using absolute alignment.
*
* Maps the text area to be exactly inside of video canvas for [0, 0] - [1, 1]:
*
* [0, 0]: Top-Lefts of video and text are aligned
* [0.5, 0.5]: Centers are aligned
* [1, 1]: Bottom-Rights are aligned
*
* Values beyond [0, 0] - [1, 1] place the text outside of the video canvas.
*
* Since: 1.8
*/
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_X_ABSOLUTE,
g_param_spec_double ("x-absolute", "horizontal position",
"Horizontal position when using absolute alignment", -G_MAXDOUBLE,
G_MAXDOUBLE, DEFAULT_PROP_XPOS,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
/**
* GstBaseTextOverlay:y-absolute:
*
* See x-absolute.
*
* Vertical position of the rendered text when using absolute alignment.
*
* Since: 1.8
*/
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_Y_ABSOLUTE,
g_param_spec_double ("y-absolute", "vertical position",
"Vertical position when using absolute alignment", -G_MAXDOUBLE,
G_MAXDOUBLE, DEFAULT_PROP_YPOS,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_WRAP_MODE,
g_param_spec_enum ("wrap-mode", "wrap mode",
"Whether to wrap the text and if so how.",
GST_TYPE_BASE_TEXT_OVERLAY_WRAP_MODE, DEFAULT_PROP_WRAP_MODE,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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_STATIC_STRINGS));
/**
* GstBaseTextOverlay:color:
*
* Color of the rendered text.
*/
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_COLOR,
g_param_spec_uint ("color", "Color",
"Color to use for text (big-endian ARGB).", 0, G_MAXUINT32,
DEFAULT_PROP_COLOR,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
/**
* GstTextOverlay:outline-color:
*
* Color of the outline of the rendered text.
*/
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_OUTLINE_COLOR,
g_param_spec_uint ("outline-color", "Text Outline Color",
"Color to use for outline the text (big-endian ARGB).", 0,
G_MAXUINT32, DEFAULT_PROP_OUTLINE_COLOR,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
/**
* GstBaseTextOverlay:line-alignment:
*
* Alignment of text lines relative to each other (for multi-line text)
*/
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_LINE_ALIGNMENT,
g_param_spec_enum ("line-alignment", "line alignment",
"Alignment of text lines relative to each other.",
GST_TYPE_BASE_TEXT_OVERLAY_LINE_ALIGN, DEFAULT_PROP_LINE_ALIGNMENT,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstBaseTextOverlay:silent:
*
* If set, no text is rendered. Useful to switch off text rendering
* temporarily without removing the textoverlay element from the pipeline.
*/
/* FIXME 0.11: rename to "visible" or "text-visible" or "render-text" */
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_SILENT,
g_param_spec_boolean ("silent", "silent",
"Whether to render the text string",
DEFAULT_PROP_SILENT,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
/**
* GstBaseTextOverlay:draw-shadow:
*
* If set, a text shadow is drawn.
*
* Since: 1.6
*/
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_DRAW_SHADOW,
g_param_spec_boolean ("draw-shadow", "draw-shadow",
"Whether to draw shadow",
DEFAULT_PROP_DRAW_SHADOW,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstBaseTextOverlay:draw-outline:
*
* If set, an outline is drawn.
*
* Since: 1.6
*/
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_DRAW_OUTLINE,
g_param_spec_boolean ("draw-outline", "draw-outline",
"Whether to draw outline",
DEFAULT_PROP_DRAW_OUTLINE,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstBaseTextOverlay:wait-text:
*
* If set, the video will block until a subtitle is received on the text pad.
* If video and subtitles are sent in sync, like from the same demuxer, this
* property should be set.
*/
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_WAIT_TEXT,
g_param_spec_boolean ("wait-text", "Wait Text",
"Whether to wait for subtitles",
DEFAULT_PROP_WAIT_TEXT, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (G_OBJECT_CLASS (klass),
PROP_AUTO_ADJUST_SIZE, g_param_spec_boolean ("auto-resize", "auto resize",
"Automatically adjust font size to screen-size.",
DEFAULT_PROP_AUTO_ADJUST_SIZE,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_VERTICAL_RENDER,
g_param_spec_boolean ("vertical-render", "vertical render",
"Vertical Render.", DEFAULT_PROP_VERTICAL_RENDER,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstBaseTextOverlay:scale-mode:
*
* Scale text to compensate for and avoid distortion by subsequent video scaling
*
* Since: 1.14
*/
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_SCALE_MODE,
g_param_spec_enum ("scale-mode", "scale mode",
"Scale text to compensate for and avoid distortion by subsequent video scaling.",
GST_TYPE_BASE_TEXT_OVERLAY_SCALE_MODE, DEFAULT_PROP_SCALE_MODE,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstBaseTextOverlay:scale-pixel-aspect-ratio:
*
* Video scaling pixel-aspect-ratio to compensate for in user scale-mode.
*
* Since: 1.14
*/
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_SCALE_PAR,
gst_param_spec_fraction ("scale-pixel-aspect-ratio",
"scale pixel aspect ratio",
"Pixel aspect ratio of video scale to compensate for in user scale-mode",
1, 100, 100, 1, DEFAULT_PROP_SCALE_PAR_N, DEFAULT_PROP_SCALE_PAR_D,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gst_type_mark_as_plugin_api (GST_TYPE_BASE_TEXT_OVERLAY_HALIGN, 0);
gst_type_mark_as_plugin_api (GST_TYPE_BASE_TEXT_OVERLAY_VALIGN, 0);
gst_type_mark_as_plugin_api (GST_TYPE_BASE_TEXT_OVERLAY_LINE_ALIGN, 0);
gst_type_mark_as_plugin_api (GST_TYPE_BASE_TEXT_OVERLAY_SCALE_MODE, 0);
gst_type_mark_as_plugin_api (GST_TYPE_BASE_TEXT_OVERLAY_WRAP_MODE, 0);
gst_type_mark_as_plugin_api (GST_TYPE_BASE_TEXT_OVERLAY, 0);
}
static void
gst_base_text_overlay_finalize (GObject * object)
{
GstBaseTextOverlay *overlay = GST_BASE_TEXT_OVERLAY (object);
g_free (overlay->default_text);
if (overlay->composition) {
gst_video_overlay_composition_unref (overlay->composition);
overlay->composition = NULL;
}
if (overlay->text_image) {
gst_buffer_unref (overlay->text_image);
overlay->text_image = NULL;
}
if (overlay->layout) {
g_object_unref (overlay->layout);
overlay->layout = NULL;
}
if (overlay->text_buffer) {
gst_buffer_unref (overlay->text_buffer);
overlay->text_buffer = NULL;
}
if (overlay->pango_context) {
g_object_unref (overlay->pango_context);
overlay->pango_context = NULL;
}
g_mutex_clear (&overlay->lock);
g_cond_clear (&overlay->cond);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gst_base_text_overlay_init (GstBaseTextOverlay * overlay,
GstBaseTextOverlayClass * klass)
{
GstPadTemplate *template;
PangoFontDescription *desc;
PangoFontMap *fontmap;
fontmap = pango_cairo_font_map_new ();
overlay->pango_context =
pango_font_map_create_context (PANGO_FONT_MAP (fontmap));
g_object_unref (fontmap);
pango_context_set_base_gravity (overlay->pango_context, PANGO_GRAVITY_SOUTH);
/* video sink */
template = gst_static_pad_template_get (&video_sink_template_factory);
overlay->video_sinkpad = gst_pad_new_from_template (template, "video_sink");
gst_object_unref (template);
gst_pad_set_event_function (overlay->video_sinkpad,
GST_DEBUG_FUNCPTR (gst_base_text_overlay_video_event));
gst_pad_set_chain_function (overlay->video_sinkpad,
GST_DEBUG_FUNCPTR (gst_base_text_overlay_video_chain));
gst_pad_set_query_function (overlay->video_sinkpad,
GST_DEBUG_FUNCPTR (gst_base_text_overlay_video_query));
GST_PAD_SET_PROXY_ALLOCATION (overlay->video_sinkpad);
gst_element_add_pad (GST_ELEMENT (overlay), overlay->video_sinkpad);
template =
gst_element_class_get_pad_template (GST_ELEMENT_CLASS (klass),
"text_sink");
if (template) {
/* text sink */
overlay->text_sinkpad = gst_pad_new_from_template (template, "text_sink");
gst_pad_set_event_function (overlay->text_sinkpad,
GST_DEBUG_FUNCPTR (gst_base_text_overlay_text_event));
gst_pad_set_chain_function (overlay->text_sinkpad,
GST_DEBUG_FUNCPTR (gst_base_text_overlay_text_chain));
gst_pad_set_link_function (overlay->text_sinkpad,
GST_DEBUG_FUNCPTR (gst_base_text_overlay_text_pad_link));
gst_pad_set_unlink_function (overlay->text_sinkpad,
GST_DEBUG_FUNCPTR (gst_base_text_overlay_text_pad_unlink));
gst_element_add_pad (GST_ELEMENT (overlay), overlay->text_sinkpad);
}
/* (video) source */
template = gst_static_pad_template_get (&src_template_factory);
overlay->srcpad = gst_pad_new_from_template (template, "src");
gst_object_unref (template);
gst_pad_set_event_function (overlay->srcpad,
GST_DEBUG_FUNCPTR (gst_base_text_overlay_src_event));
gst_pad_set_query_function (overlay->srcpad,
GST_DEBUG_FUNCPTR (gst_base_text_overlay_src_query));
gst_element_add_pad (GST_ELEMENT (overlay), overlay->srcpad);
overlay->layout = pango_layout_new (overlay->pango_context);
desc = pango_context_get_font_description (overlay->pango_context);
gst_base_text_overlay_adjust_values_with_fontdesc (overlay, desc);
overlay->color = DEFAULT_PROP_COLOR;
overlay->outline_color = DEFAULT_PROP_OUTLINE_COLOR;
overlay->halign = DEFAULT_PROP_HALIGNMENT;
overlay->valign = DEFAULT_PROP_VALIGNMENT;
overlay->xpad = DEFAULT_PROP_XPAD;
overlay->ypad = DEFAULT_PROP_YPAD;
overlay->deltax = DEFAULT_PROP_DELTAX;
overlay->deltay = DEFAULT_PROP_DELTAY;
overlay->xpos = DEFAULT_PROP_XPOS;
overlay->ypos = DEFAULT_PROP_YPOS;
overlay->wrap_mode = DEFAULT_PROP_WRAP_MODE;
overlay->want_shading = DEFAULT_PROP_SHADING;
overlay->shading_value = DEFAULT_PROP_SHADING_VALUE;
overlay->silent = DEFAULT_PROP_SILENT;
overlay->draw_shadow = DEFAULT_PROP_DRAW_SHADOW;
overlay->draw_outline = DEFAULT_PROP_DRAW_OUTLINE;
overlay->wait_text = DEFAULT_PROP_WAIT_TEXT;
overlay->auto_adjust_size = DEFAULT_PROP_AUTO_ADJUST_SIZE;
overlay->default_text = g_strdup (DEFAULT_PROP_TEXT);
overlay->need_render = TRUE;
overlay->text_image = NULL;
overlay->use_vertical_render = DEFAULT_PROP_VERTICAL_RENDER;
overlay->scale_mode = DEFAULT_PROP_SCALE_MODE;
overlay->scale_par_n = DEFAULT_PROP_SCALE_PAR_N;
overlay->scale_par_d = DEFAULT_PROP_SCALE_PAR_D;
overlay->line_align = DEFAULT_PROP_LINE_ALIGNMENT;
pango_layout_set_alignment (overlay->layout,
(PangoAlignment) overlay->line_align);
overlay->text_buffer = NULL;
overlay->text_linked = FALSE;
overlay->composition = NULL;
overlay->upstream_composition = NULL;
overlay->width = 1;
overlay->height = 1;
overlay->window_width = 1;
overlay->window_height = 1;
overlay->text_width = DEFAULT_PROP_TEXT_WIDTH;
overlay->text_height = DEFAULT_PROP_TEXT_HEIGHT;
overlay->text_x = DEFAULT_PROP_TEXT_X;
overlay->text_y = DEFAULT_PROP_TEXT_Y;
overlay->render_width = 1;
overlay->render_height = 1;
overlay->render_scale = 1.0l;
g_mutex_init (&overlay->lock);
g_cond_init (&overlay->cond);
gst_segment_init (&overlay->segment, GST_FORMAT_TIME);
}
static void
gst_base_text_overlay_set_wrap_mode (GstBaseTextOverlay * overlay, gint width)
{
if (overlay->wrap_mode == GST_BASE_TEXT_OVERLAY_WRAP_MODE_NONE) {
GST_DEBUG_OBJECT (overlay, "Set wrap mode NONE");
pango_layout_set_width (overlay->layout, -1);
} else {
width = width * PANGO_SCALE;
GST_DEBUG_OBJECT (overlay, "Set layout width %d", width);
GST_DEBUG_OBJECT (overlay, "Set wrap mode %d", overlay->wrap_mode);
pango_layout_set_width (overlay->layout, width);
}
pango_layout_set_wrap (overlay->layout, (PangoWrapMode) overlay->wrap_mode);
}
static gboolean
gst_base_text_overlay_setcaps_txt (GstBaseTextOverlay * overlay, GstCaps * caps)
{
GstStructure *structure;
const gchar *format;
structure = gst_caps_get_structure (caps, 0);
format = gst_structure_get_string (structure, "format");
overlay->have_pango_markup = (strcmp (format, "pango-markup") == 0);
return TRUE;
}
/* only negotiate/query video overlay composition support for now */
static gboolean
gst_base_text_overlay_negotiate (GstBaseTextOverlay * overlay, GstCaps * caps)
{
gboolean upstream_has_meta = FALSE;
gboolean caps_has_meta = FALSE;
gboolean alloc_has_meta = FALSE;
gboolean attach = FALSE;
gboolean ret = TRUE;
guint width, height;
GstCapsFeatures *f;
GstCaps *overlay_caps;
GstQuery *query;
guint alloc_index;
GST_DEBUG_OBJECT (overlay, "performing negotiation");
/* Clear any pending reconfigure to avoid negotiating twice */
gst_pad_check_reconfigure (overlay->srcpad);
if (!caps)
caps = gst_pad_get_current_caps (overlay->video_sinkpad);
else
gst_caps_ref (caps);
if (!caps || gst_caps_is_empty (caps))
goto no_format;
/* Check if upstream caps have meta */
if ((f = gst_caps_get_features (caps, 0))) {
upstream_has_meta = gst_caps_features_contains (f,
GST_CAPS_FEATURE_META_GST_VIDEO_OVERLAY_COMPOSITION);
}
/* Initialize dimensions */
width = overlay->width;
height = overlay->height;
if (upstream_has_meta) {
overlay_caps = gst_caps_ref (caps);
} else {
GstCaps *peercaps;
/* BaseTransform requires caps for the allocation query to work */
overlay_caps = gst_caps_copy (caps);
f = gst_caps_get_features (overlay_caps, 0);
gst_caps_features_add (f,
GST_CAPS_FEATURE_META_GST_VIDEO_OVERLAY_COMPOSITION);
/* Then check if downstream accept overlay composition in caps */
/* FIXME: We should probably check if downstream *prefers* the
* overlay meta, and only enforce usage of it if we can't handle
* the format ourselves and thus would have to drop the overlays.
* Otherwise we should prefer what downstream wants here.
*/
peercaps = gst_pad_peer_query_caps (overlay->srcpad, overlay_caps);
caps_has_meta = !gst_caps_is_empty (peercaps);
gst_caps_unref (peercaps);
GST_DEBUG_OBJECT (overlay, "caps have overlay meta %d", caps_has_meta);
}
if (upstream_has_meta || caps_has_meta) {
/* Send caps immediately, it's needed by GstBaseTransform to get a reply
* from allocation query */
ret = gst_pad_set_caps (overlay->srcpad, overlay_caps);
/* First check if the allocation meta has compositon */
query = gst_query_new_allocation (overlay_caps, FALSE);
if (!gst_pad_peer_query (overlay->srcpad, query)) {
/* no problem, we use the query defaults */
GST_DEBUG_OBJECT (overlay, "ALLOCATION query failed");
/* In case we were flushing, mark reconfigure and fail this method,
* will make it retry */
if (overlay->video_flushing)
ret = FALSE;
}
alloc_has_meta = gst_query_find_allocation_meta (query,
GST_VIDEO_OVERLAY_COMPOSITION_META_API_TYPE, &alloc_index);
GST_DEBUG_OBJECT (overlay, "sink alloc has overlay meta %d",
alloc_has_meta);
if (alloc_has_meta) {
const GstStructure *params;
gst_query_parse_nth_allocation_meta (query, alloc_index, ¶ms);
if (params) {
if (gst_structure_get (params, "width", G_TYPE_UINT, &width,
"height", G_TYPE_UINT, &height, NULL)) {
GST_DEBUG_OBJECT (overlay, "received window size: %dx%d", width,
height);
g_assert (width != 0 && height != 0);
}
}
}
gst_query_unref (query);
}
/* Update render size if needed */
overlay->window_width = width;
overlay->window_height = height;
gst_base_text_overlay_update_render_size (overlay);
/* For backward compatibility, we will prefer blitting if downstream
* allocation does not support the meta. In other case we will prefer
* attaching, and will fail the negotiation in the unlikely case we are
* force to blit, but format isn't supported. */
if (upstream_has_meta) {
attach = TRUE;
} else if (caps_has_meta) {
if (alloc_has_meta) {
attach = TRUE;
} else {
/* Don't attach unless we cannot handle the format */
attach = !gst_base_text_overlay_can_handle_caps (caps);
}
} else {
ret = gst_base_text_overlay_can_handle_caps (caps);
}
/* If we attach, then pick the overlay caps */
if (attach) {
GST_DEBUG_OBJECT (overlay, "Using caps %" GST_PTR_FORMAT, overlay_caps);
/* Caps where already sent */
} else if (ret) {
GST_DEBUG_OBJECT (overlay, "Using caps %" GST_PTR_FORMAT, caps);
ret = gst_pad_set_caps (overlay->srcpad, caps);
}
overlay->attach_compo_to_buffer = attach;
if (!ret) {
GST_DEBUG_OBJECT (overlay, "negotiation failed, schedule reconfigure");
gst_pad_mark_reconfigure (overlay->srcpad);
}
gst_caps_unref (overlay_caps);
gst_caps_unref (caps);
return ret;
no_format:
{
if (caps)
gst_caps_unref (caps);
gst_pad_mark_reconfigure (overlay->srcpad);
return FALSE;
}
}
static gboolean
gst_base_text_overlay_can_handle_caps (GstCaps * incaps)
{
gboolean ret;
GstCaps *caps;
caps = gst_static_caps_get (&sw_template_caps);
ret = gst_caps_is_subset (incaps, caps);
gst_caps_unref (caps);
return ret;
}
static gboolean
gst_base_text_overlay_setcaps (GstBaseTextOverlay * overlay, GstCaps * caps)
{