--- /dev/null
+/* 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., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+/**
+ * SECTION:element-textoverlay
+ * @see_also: #GstTextRender, #GstClockOverlay, #GstTimeOverlay, #GstSubParse
+ *
+ * This plugin renders text on top of a video stream. This can be either
+ * static text or text from buffers received on the text sink pad, e.g.
+ * as produced by the subparse element. If the text sink pad is not linked,
+ * the text set via the "text" property will be rendered. If the text sink
+ * pad is linked, text will be rendered as it is received on that pad,
+ * honouring and matching the buffer timestamps of both input streams.
+ *
+ * The text can contain newline characters and text wrapping is enabled by
+ * default.
+ *
+ * <refsect2>
+ * <title>Example launch lines</title>
+ * |[
+ * gst-launch -v videotestsrc ! textoverlay text="Room A" valign=top halign=left ! xvimagesink
+ * ]| Here is a simple pipeline that displays a static text in the top left
+ * corner of the video picture
+ * |[
+ * gst-launch -v filesrc location=subtitles.srt ! subparse ! txt. videotestsrc ! timeoverlay ! textoverlay name=txt shaded-background=yes ! xvimagesink
+ * ]| Here is another pipeline that displays subtitles from an .srt subtitle
+ * file, centered at the bottom of the picture and with a rectangular shading
+ * around the text in the background:
+ * <para>
+ * If you do not have such a subtitle file, create one looking like this
+ * in a text editor:
+ * |[
+ * 1
+ * 00:00:03,000 --> 00:00:05,000
+ * Hello? (3-5s)
+ *
+ * 2
+ * 00:00:08,000 --> 00:00:13,000
+ * Yes, this is a subtitle. Don't
+ * you like it? (8-13s)
+ *
+ * 3
+ * 00:00:18,826 --> 00:01:02,886
+ * Uh? What are you talking about?
+ * I don't understand (18-62s)
+ * ]|
+ * </para>
+ * </refsect2>
+ */
+
+/* FIXME: alloc segment as part of instance struct */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <gst/video/video.h>
+
+#include "gstbasetextoverlay.h"
+#include "gsttextoverlay.h"
+#include "gsttimeoverlay.h"
+#include "gstclockoverlay.h"
+#include "gsttextrender.h"
+#include <string.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)
+ * - make 'shading_value' a property (or enum: light/normal/dark/verydark)?
+ */
+
+GST_DEBUG_CATEGORY (pango_debug);
+#define GST_CAT_DEFAULT pango_debug
+
+#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_VALIGN "baseline"
+#define DEFAULT_PROP_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_COLOR 0xffffffff
+#define DEFAULT_PROP_OUTLINE_COLOR 0xff000000
+
+/* make a property of me */
+#define DEFAULT_SHADING_VALUE -80
+
+#define MINIMUM_OUTLINE_OFFSET 1.0
+#define DEFAULT_SCALE_BASIS 640
+
+#define COMP_Y(ret, r, g, b) \
+{ \
+ ret = (int) (((19595 * r) >> 16) + ((38470 * g) >> 16) + ((7471 * b) >> 16)); \
+ ret = CLAMP (ret, 0, 255); \
+}
+
+#define COMP_U(ret, r, g, b) \
+{ \
+ ret = (int) (-((11059 * r) >> 16) - ((21709 * g) >> 16) + ((32768 * b) >> 16) + 128); \
+ ret = CLAMP (ret, 0, 255); \
+}
+
+#define COMP_V(ret, r, g, b) \
+{ \
+ ret = (int) (((32768 * r) >> 16) - ((27439 * g) >> 16) - ((5329 * b) >> 16) + 128); \
+ ret = CLAMP (ret, 0, 255); \
+}
+
+#define BLEND(ret, alpha, v0, v1) \
+{ \
+ ret = (v0 * alpha + v1 * (255 - alpha)) / 255; \
+}
+
+#define OVER(ret, alphaA, Ca, alphaB, Cb, alphaNew) \
+{ \
+ gint _tmp; \
+ _tmp = (Ca * alphaA + Cb * alphaB * (255 - alphaA) / 255) / alphaNew; \
+ ret = CLAMP (_tmp, 0, 255); \
+}
+
+#if G_BYTE_ORDER == G_LITTLE_ENDIAN
+# define CAIRO_ARGB_A 3
+# define CAIRO_ARGB_R 2
+# define CAIRO_ARGB_G 1
+# define CAIRO_ARGB_B 0
+#else
+# define CAIRO_ARGB_A 0
+# define CAIRO_ARGB_R 1
+# define CAIRO_ARGB_G 2
+# define CAIRO_ARGB_B 3
+#endif
+
+enum
+{
+ PROP_0,
+ PROP_TEXT,
+ PROP_SHADING,
+ PROP_VALIGN, /* deprecated */
+ PROP_HALIGN, /* deprecated */
+ PROP_HALIGNMENT,
+ PROP_VALIGNMENT,
+ PROP_XPAD,
+ PROP_YPAD,
+ PROP_DELTAX,
+ PROP_DELTAY,
+ PROP_XPOS,
+ PROP_YPOS,
+ PROP_WRAP_MODE,
+ PROP_FONT_DESC,
+ PROP_SILENT,
+ PROP_LINE_ALIGNMENT,
+ PROP_WAIT_TEXT,
+ PROP_AUTO_ADJUST_SIZE,
+ PROP_VERTICAL_RENDER,
+ PROP_COLOR,
+ PROP_SHADOW,
+ PROP_OUTLINE_COLOR,
+ PROP_LAST
+};
+
+#define VIDEO_FORMATS "{ BGRx, RGBx, xRGB, xBGR, RGBA, BGRA, ARGB, ABGR, AYUV, I420, UYVY, NV12, NV21 } "
+
+static GstStaticPadTemplate src_template_factory =
+GST_STATIC_PAD_TEMPLATE ("src",
+ GST_PAD_SRC,
+ GST_PAD_ALWAYS,
+ GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE (VIDEO_FORMATS))
+ );
+
+static GstStaticPadTemplate video_sink_template_factory =
+GST_STATIC_PAD_TEMPLATE ("video_sink",
+ GST_PAD_SINK,
+ GST_PAD_ALWAYS,
+ GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE (VIDEO_FORMATS))
+ );
+
+#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", "position"},
+ {GST_BASE_TEXT_OVERLAY_VALIGN_CENTER, "center", "center"},
+ {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", "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_BASE_TEXT_OVERLAY_GET_COND(ov) (((GstBaseTextOverlay *)ov)->cond)
+#define GST_BASE_TEXT_OVERLAY_WAIT(ov) (g_cond_wait (GST_BASE_TEXT_OVERLAY_GET_COND (ov), GST_OBJECT_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_base_init (gpointer g_class);
+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_getcaps (GstPad * pad, 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,
+ GstEvent * event);
+static gboolean gst_base_text_overlay_src_query (GstPad * pad,
+ GstQuery * query);
+
+static gboolean gst_base_text_overlay_video_event (GstPad * pad,
+ GstEvent * event);
+static GstFlowReturn gst_base_text_overlay_video_chain (GstPad * pad,
+ GstBuffer * buffer);
+
+static gboolean gst_base_text_overlay_text_event (GstPad * pad,
+ GstEvent * event);
+static GstFlowReturn gst_base_text_overlay_text_chain (GstPad * pad,
+ GstBuffer * buffer);
+static GstPadLinkReturn gst_base_text_overlay_text_pad_link (GstPad * pad,
+ GstPad * peer);
+static void gst_base_text_overlay_text_pad_unlink (GstPad * pad);
+static void gst_base_text_overlay_pop_text (GstBaseTextOverlay * overlay);
+static void gst_base_text_overlay_update_render_mode (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);
+
+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) gst_base_text_overlay_base_init,
+ 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_base_init (gpointer g_class)
+{
+ GstBaseTextOverlayClass *klass = GST_BASE_TEXT_OVERLAY_CLASS (g_class);
+ PangoFontMap *fontmap;
+
+ /* Only lock for the subclasses here, the base class
+ * doesn't have this mutex yet and it's not necessary
+ * here */
+ if (klass->pango_lock)
+ g_mutex_lock (klass->pango_lock);
+ fontmap = pango_cairo_font_map_get_default ();
+ klass->pango_context =
+ pango_cairo_font_map_create_context (PANGO_CAIRO_FONT_MAP (fontmap));
+ if (klass->pango_lock)
+ g_mutex_unlock (klass->pango_lock);
+}
+
+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_pad_template (gstelement_class,
+ gst_static_pad_template_get (&src_template_factory));
+ gst_element_class_add_pad_template (gstelement_class,
+ gst_static_pad_template_get (&video_sink_template_factory));
+
+ gstelement_class->change_state =
+ GST_DEBUG_FUNCPTR (gst_base_text_overlay_change_state);
+
+ klass->pango_lock = g_mutex_new ();
+
+ 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_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));
+ g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_VALIGN,
+ g_param_spec_string ("valign", "vertical alignment",
+ "Vertical alignment of the text (deprecated; use valignment)",
+ DEFAULT_PROP_VALIGN, G_PARAM_WRITABLE | G_PARAM_STATIC_STRINGS));
+ g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_HALIGN,
+ g_param_spec_string ("halign", "horizontal alignment",
+ "Horizontal alignment of the text (deprecated; use halignment)",
+ DEFAULT_PROP_HALIGN, G_PARAM_WRITABLE | G_PARAM_STATIC_STRINGS));
+ 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,
+ 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, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+ /**
+ * GstBaseTextOverlay:xpos
+ *
+ * Horizontal position of the rendered text when using positioned alignment.
+ *
+ * Since: 0.10.31
+ **/
+ g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_XPOS,
+ g_param_spec_double ("xpos", "horizontal position",
+ "Horizontal position when using 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.
+ *
+ * Since: 0.10.31
+ **/
+ g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_YPOS,
+ g_param_spec_double ("ypos", "vertical position",
+ "Vertical position when using position alignment", 0, 1.0,
+ 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_WRITABLE | G_PARAM_STATIC_STRINGS));
+ /**
+ * GstBaseTextOverlay:color
+ *
+ * Color of the rendered text.
+ *
+ * Since: 0.10.31
+ **/
+ 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.
+ *
+ * Since: 0.10.35
+ **/
+ 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)
+ *
+ * Since: 0.10.15
+ **/
+ 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.
+ *
+ * Since: 0.10.15
+ **/
+ /* 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: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.
+ *
+ * Since: 0.10.20
+ **/
+ 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));
+}
+
+static void
+gst_base_text_overlay_finalize (GObject * object)
+{
+ GstBaseTextOverlay *overlay = GST_BASE_TEXT_OVERLAY (object);
+
+ g_free (overlay->default_text);
+
+ if (overlay->text_image) {
+ g_free (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->cond) {
+ g_cond_free (overlay->cond);
+ overlay->cond = NULL;
+ }
+
+ G_OBJECT_CLASS (parent_class)->finalize (object);
+}
+
+static void
+gst_base_text_overlay_init (GstBaseTextOverlay * overlay,
+ GstBaseTextOverlayClass * klass)
+{
+ GstPadTemplate *template;
+ PangoFontDescription *desc;
+
+ /* 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_getcaps_function (overlay->video_sinkpad,
+ GST_DEBUG_FUNCPTR (gst_base_text_overlay_getcaps));
+ 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_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_object_unref (template);
+
+ 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_getcaps_function (overlay->srcpad,
+ GST_DEBUG_FUNCPTR (gst_base_text_overlay_getcaps));
+ 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);
+
+ g_mutex_lock (GST_BASE_TEXT_OVERLAY_GET_CLASS (overlay)->pango_lock);
+ overlay->line_align = DEFAULT_PROP_LINE_ALIGNMENT;
+ overlay->layout =
+ pango_layout_new (GST_BASE_TEXT_OVERLAY_GET_CLASS
+ (overlay)->pango_context);
+ desc =
+ pango_context_get_font_description (GST_BASE_TEXT_OVERLAY_GET_CLASS
+ (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_SHADING_VALUE;
+ overlay->silent = DEFAULT_PROP_SILENT;
+ 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;
+ gst_base_text_overlay_update_render_mode (overlay);
+
+ overlay->text_buffer = NULL;
+ overlay->text_linked = FALSE;
+ overlay->cond = g_cond_new ();
+ gst_segment_init (&overlay->segment, GST_FORMAT_TIME);
+ g_mutex_unlock (GST_BASE_TEXT_OVERLAY_GET_CLASS (overlay)->pango_lock);
+}
+
+static void
+gst_base_text_overlay_update_wrap_mode (GstBaseTextOverlay * overlay)
+{
+ 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 {
+ int width;
+
+ if (overlay->auto_adjust_size) {
+ width = DEFAULT_SCALE_BASIS * PANGO_SCALE;
+ if (overlay->use_vertical_render) {
+ width = width * (overlay->height - overlay->ypad * 2) / overlay->width;
+ }
+ } else {
+ width =
+ (overlay->use_vertical_render ? overlay->height : overlay->width) *
+ PANGO_SCALE;
+ }
+
+ GST_DEBUG_OBJECT (overlay, "Set layout width %d", overlay->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 void
+gst_base_text_overlay_update_render_mode (GstBaseTextOverlay * overlay)
+{
+ PangoMatrix matrix = PANGO_MATRIX_INIT;
+ PangoContext *context = pango_layout_get_context (overlay->layout);
+
+ if (overlay->use_vertical_render) {
+ pango_matrix_rotate (&matrix, -90);
+ pango_context_set_base_gravity (context, PANGO_GRAVITY_AUTO);
+ pango_context_set_matrix (context, &matrix);
+ pango_layout_set_alignment (overlay->layout, PANGO_ALIGN_LEFT);
+ } else {
+ pango_context_set_base_gravity (context, PANGO_GRAVITY_SOUTH);
+ pango_context_set_matrix (context, &matrix);
+ pango_layout_set_alignment (overlay->layout, overlay->line_align);
+ }
+}
+
+static gboolean
+gst_base_text_overlay_setcaps_txt (GstBaseTextOverlay * overlay, GstCaps * caps)
+{
+ GstStructure *structure;
+
+ structure = gst_caps_get_structure (caps, 0);
+ overlay->have_pango_markup =
+ gst_structure_has_name (structure, "text/x-pango-markup");
+
+ return TRUE;
+}
+
+/* FIXME: upstream nego (e.g. when the video window is resized) */
+
+static gboolean
+gst_base_text_overlay_setcaps (GstBaseTextOverlay * overlay, GstCaps * caps)
+{
+ GstVideoInfo info;
+ gboolean ret = FALSE;
+
+ if (!gst_video_info_from_caps (&info, caps))
+ goto invalid_caps;
+
+ overlay->info = info;
+ overlay->format = GST_VIDEO_INFO_FORMAT (&info);
+ overlay->width = GST_VIDEO_INFO_WIDTH (&info);
+ overlay->height = GST_VIDEO_INFO_HEIGHT (&info);
+
+ ret = gst_pad_push_event (overlay->srcpad, gst_event_new_caps (caps));
+
+ if (ret) {
+ GST_OBJECT_LOCK (overlay);
+ g_mutex_lock (GST_BASE_TEXT_OVERLAY_GET_CLASS (overlay)->pango_lock);
+ gst_base_text_overlay_update_wrap_mode (overlay);
+ g_mutex_unlock (GST_BASE_TEXT_OVERLAY_GET_CLASS (overlay)->pango_lock);
+ GST_OBJECT_UNLOCK (overlay);
+ }
+
+ return ret;
+
+ /* ERRORS */
+invalid_caps:
+ {
+ GST_DEBUG_OBJECT (overlay, "could not parse caps");
+ return FALSE;
+ }
+}
+
+static void
+gst_base_text_overlay_set_property (GObject * object, guint prop_id,
+ const GValue * value, GParamSpec * pspec)
+{
+ GstBaseTextOverlay *overlay = GST_BASE_TEXT_OVERLAY (object);
+
+ GST_OBJECT_LOCK (overlay);
+ switch (prop_id) {
+ case PROP_TEXT:
+ g_free (overlay->default_text);
+ overlay->default_text = g_value_dup_string (value);
+ overlay->need_render = TRUE;
+ break;
+ case PROP_SHADING:
+ overlay->want_shading = g_value_get_boolean (value);
+ break;
+ case PROP_XPAD:
+ overlay->xpad = g_value_get_int (value);
+ break;
+ case PROP_YPAD:
+ overlay->ypad = g_value_get_int (value);
+ break;
+ case PROP_DELTAX:
+ overlay->deltax = g_value_get_int (value);
+ break;
+ case PROP_DELTAY:
+ overlay->deltay = g_value_get_int (value);
+ break;
+ case PROP_XPOS:
+ overlay->xpos = g_value_get_double (value);
+ break;
+ case PROP_YPOS:
+ overlay->ypos = g_value_get_double (value);
+ break;
+ case PROP_HALIGN:{
+ const gchar *s = g_value_get_string (value);
+
+ if (s && g_ascii_strcasecmp (s, "left") == 0)
+ overlay->halign = GST_BASE_TEXT_OVERLAY_HALIGN_LEFT;
+ else if (s && g_ascii_strcasecmp (s, "center") == 0)
+ overlay->halign = GST_BASE_TEXT_OVERLAY_HALIGN_CENTER;
+ else if (s && g_ascii_strcasecmp (s, "right") == 0)
+ overlay->halign = GST_BASE_TEXT_OVERLAY_HALIGN_RIGHT;
+ else
+ g_warning ("Invalid value '%s' for textoverlay property 'halign'",
+ GST_STR_NULL (s));
+ break;
+ }
+ case PROP_VALIGN:{
+ const gchar *s = g_value_get_string (value);
+
+ if (s && g_ascii_strcasecmp (s, "baseline") == 0)
+ overlay->valign = GST_BASE_TEXT_OVERLAY_VALIGN_BASELINE;
+ else if (s && g_ascii_strcasecmp (s, "bottom") == 0)
+ overlay->valign = GST_BASE_TEXT_OVERLAY_VALIGN_BOTTOM;
+ else if (s && g_ascii_strcasecmp (s, "top") == 0)
+ overlay->valign = GST_BASE_TEXT_OVERLAY_VALIGN_TOP;
+ else
+ g_warning ("Invalid value '%s' for textoverlay property 'valign'",
+ GST_STR_NULL (s));
+ break;
+ }
+ case PROP_VALIGNMENT:
+ overlay->valign = g_value_get_enum (value);
+ break;
+ case PROP_HALIGNMENT:
+ overlay->halign = g_value_get_enum (value);
+ break;
+ case PROP_WRAP_MODE:
+ overlay->wrap_mode = g_value_get_enum (value);
+ g_mutex_lock (GST_BASE_TEXT_OVERLAY_GET_CLASS (overlay)->pango_lock);
+ gst_base_text_overlay_update_wrap_mode (overlay);
+ g_mutex_unlock (GST_BASE_TEXT_OVERLAY_GET_CLASS (overlay)->pango_lock);
+ break;
+ case PROP_FONT_DESC:
+ {
+ PangoFontDescription *desc;
+ const gchar *fontdesc_str;
+
+ fontdesc_str = g_value_get_string (value);
+ g_mutex_lock (GST_BASE_TEXT_OVERLAY_GET_CLASS (overlay)->pango_lock);
+ desc = pango_font_description_from_string (fontdesc_str);
+ if (desc) {
+ GST_LOG_OBJECT (overlay, "font description set: %s", fontdesc_str);
+ pango_layout_set_font_description (overlay->layout, desc);
+ gst_base_text_overlay_adjust_values_with_fontdesc (overlay, desc);
+ pango_font_description_free (desc);
+ } else {
+ GST_WARNING_OBJECT (overlay, "font description parse failed: %s",
+ fontdesc_str);
+ }
+ g_mutex_unlock (GST_BASE_TEXT_OVERLAY_GET_CLASS (overlay)->pango_lock);
+ break;
+ }
+ case PROP_COLOR:
+ overlay->color = g_value_get_uint (value);
+ break;
+ case PROP_OUTLINE_COLOR:
+ overlay->outline_color = g_value_get_uint (value);
+ break;
+ case PROP_SILENT:
+ overlay->silent = g_value_get_boolean (value);
+ break;
+ case PROP_LINE_ALIGNMENT:
+ overlay->line_align = g_value_get_enum (value);
+ g_mutex_lock (GST_BASE_TEXT_OVERLAY_GET_CLASS (overlay)->pango_lock);
+ pango_layout_set_alignment (overlay->layout,
+ (PangoAlignment) overlay->line_align);
+ g_mutex_unlock (GST_BASE_TEXT_OVERLAY_GET_CLASS (overlay)->pango_lock);
+ break;
+ case PROP_WAIT_TEXT:
+ overlay->wait_text = g_value_get_boolean (value);
+ break;
+ case PROP_AUTO_ADJUST_SIZE:
+ overlay->auto_adjust_size = g_value_get_boolean (value);
+ overlay->need_render = TRUE;
+ break;
+ case PROP_VERTICAL_RENDER:
+ overlay->use_vertical_render = g_value_get_boolean (value);
+ g_mutex_lock (GST_BASE_TEXT_OVERLAY_GET_CLASS (overlay)->pango_lock);
+ gst_base_text_overlay_update_render_mode (overlay);
+ g_mutex_unlock (GST_BASE_TEXT_OVERLAY_GET_CLASS (overlay)->pango_lock);
+ overlay->need_render = TRUE;
+ break;
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+ break;
+ }
+
+ overlay->need_render = TRUE;
+ GST_OBJECT_UNLOCK (overlay);
+}
+
+static void
+gst_base_text_overlay_get_property (GObject * object, guint prop_id,
+ GValue * value, GParamSpec * pspec)
+{
+ GstBaseTextOverlay *overlay = GST_BASE_TEXT_OVERLAY (object);
+
+ GST_OBJECT_LOCK (overlay);
+ switch (prop_id) {
+ case PROP_TEXT:
+ g_value_set_string (value, overlay->default_text);
+ break;
+ case PROP_SHADING:
+ g_value_set_boolean (value, overlay->want_shading);
+ break;
+ case PROP_XPAD:
+ g_value_set_int (value, overlay->xpad);
+ break;
+ case PROP_YPAD:
+ g_value_set_int (value, overlay->ypad);
+ break;
+ case PROP_DELTAX:
+ g_value_set_int (value, overlay->deltax);
+ break;
+ case PROP_DELTAY:
+ g_value_set_int (value, overlay->deltay);
+ break;
+ case PROP_XPOS:
+ g_value_set_double (value, overlay->xpos);
+ break;
+ case PROP_YPOS:
+ g_value_set_double (value, overlay->ypos);
+ break;
+ case PROP_VALIGNMENT:
+ g_value_set_enum (value, overlay->valign);
+ break;
+ case PROP_HALIGNMENT:
+ g_value_set_enum (value, overlay->halign);
+ break;
+ case PROP_WRAP_MODE:
+ g_value_set_enum (value, overlay->wrap_mode);
+ break;
+ case PROP_SILENT:
+ g_value_set_boolean (value, overlay->silent);
+ break;
+ case PROP_LINE_ALIGNMENT:
+ g_value_set_enum (value, overlay->line_align);
+ break;
+ case PROP_WAIT_TEXT:
+ g_value_set_boolean (value, overlay->wait_text);
+ break;
+ case PROP_AUTO_ADJUST_SIZE:
+ g_value_set_boolean (value, overlay->auto_adjust_size);
+ break;
+ case PROP_VERTICAL_RENDER:
+ g_value_set_boolean (value, overlay->use_vertical_render);
+ break;
+ case PROP_COLOR:
+ g_value_set_uint (value, overlay->color);
+ break;
+ case PROP_OUTLINE_COLOR:
+ g_value_set_uint (value, overlay->outline_color);
+ break;
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+ break;
+ }
+
+ overlay->need_render = TRUE;
+ GST_OBJECT_UNLOCK (overlay);
+}
+
+static gboolean
+gst_base_text_overlay_src_query (GstPad * pad, GstQuery * query)
+{
+ gboolean ret = FALSE;
+ GstBaseTextOverlay *overlay = NULL;
+
+ overlay = GST_BASE_TEXT_OVERLAY (gst_pad_get_parent (pad));
++ if (G_UNLIKELY (!overlay))
++ return FALSE;
+
+ ret = gst_pad_peer_query (overlay->video_sinkpad, query);
+
+ gst_object_unref (overlay);
+
+ return ret;
+}
+
+static gboolean
+gst_base_text_overlay_src_event (GstPad * pad, GstEvent * event)
+{
+ gboolean ret = FALSE;
+ GstBaseTextOverlay *overlay = NULL;
+
+ overlay = GST_BASE_TEXT_OVERLAY (gst_pad_get_parent (pad));
++ if (G_UNLIKELY (!overlay)) {
++ gst_event_unref (event);
++ return FALSE;
++ }
+
+ switch (GST_EVENT_TYPE (event)) {
+ case GST_EVENT_SEEK:{
+ GstSeekFlags flags;
+
+ /* We don't handle seek if we have not text pad */
+ if (!overlay->text_linked) {
+ GST_DEBUG_OBJECT (overlay, "seek received, pushing upstream");
+ ret = gst_pad_push_event (overlay->video_sinkpad, event);
+ goto beach;
+ }
+
+ GST_DEBUG_OBJECT (overlay, "seek received, driving from here");
+
+ gst_event_parse_seek (event, NULL, NULL, &flags, NULL, NULL, NULL, NULL);
+
+ /* Flush downstream, only for flushing seek */
+ if (flags & GST_SEEK_FLAG_FLUSH)
+ gst_pad_push_event (overlay->srcpad, gst_event_new_flush_start ());
+
+ /* Mark ourself as flushing, unblock chains */
+ GST_OBJECT_LOCK (overlay);
+ overlay->video_flushing = TRUE;
+ overlay->text_flushing = TRUE;
+ gst_base_text_overlay_pop_text (overlay);
+ GST_OBJECT_UNLOCK (overlay);
+
+ /* Seek on each sink pad */
+ gst_event_ref (event);
+ ret = gst_pad_push_event (overlay->video_sinkpad, event);
+ if (ret) {
+ ret = gst_pad_push_event (overlay->text_sinkpad, event);
+ } else {
+ gst_event_unref (event);
+ }
+ break;
+ }
+ default:
+ if (overlay->text_linked) {
+ gst_event_ref (event);
+ ret = gst_pad_push_event (overlay->video_sinkpad, event);
+ gst_pad_push_event (overlay->text_sinkpad, event);
+ } else {
+ ret = gst_pad_push_event (overlay->video_sinkpad, event);
+ }
+ break;
+ }
+
+beach:
+ gst_object_unref (overlay);
+
+ return ret;
+}
+
+static GstCaps *
+gst_base_text_overlay_getcaps (GstPad * pad, GstCaps * filter)
+{
+ GstBaseTextOverlay *overlay;
+ GstPad *otherpad;
+ GstCaps *caps;
+
+ overlay = GST_BASE_TEXT_OVERLAY (gst_pad_get_parent (pad));
++ if (G_UNLIKELY (!overlay))
++ return gst_caps_copy (gst_pad_get_pad_template_caps (pad));
+
+ if (pad == overlay->srcpad)
+ otherpad = overlay->video_sinkpad;
+ else
+ otherpad = overlay->srcpad;
+
+ /* we can do what the peer can */
+ caps = gst_pad_peer_get_caps (otherpad, filter);
+ if (caps) {
+ GstCaps *temp, *templ;
+
+ GST_DEBUG_OBJECT (pad, "peer caps %" GST_PTR_FORMAT, caps);
+
+ /* filtered against our padtemplate */
+ templ = gst_pad_get_pad_template_caps (otherpad);
+ GST_DEBUG_OBJECT (pad, "our template %" GST_PTR_FORMAT, templ);
+ temp = gst_caps_intersect_full (caps, templ, GST_CAPS_INTERSECT_FIRST);
+ GST_DEBUG_OBJECT (pad, "intersected %" GST_PTR_FORMAT, temp);
+ gst_caps_unref (caps);
+ gst_caps_unref (templ);
+ /* this is what we can do */
+ caps = temp;
+ } else {
+ /* no peer, our padtemplate is enough then */
+ caps = gst_pad_get_pad_template_caps (pad);
+ if (filter) {
+ GstCaps *intersection;
+
+ intersection =
+ gst_caps_intersect_full (filter, caps, GST_CAPS_INTERSECT_FIRST);
+ gst_caps_unref (caps);
+ caps = intersection;
+ }
+ }
+
+ GST_DEBUG_OBJECT (overlay, "returning %" GST_PTR_FORMAT, caps);
+
+ gst_object_unref (overlay);
+
+ return caps;
+}
+
+static void
+gst_base_text_overlay_adjust_values_with_fontdesc (GstBaseTextOverlay * overlay,
+ PangoFontDescription * desc)
+{
+ gint font_size = pango_font_description_get_size (desc) / PANGO_SCALE;
+ overlay->shadow_offset = (double) (font_size) / 13.0;
+ overlay->outline_offset = (double) (font_size) / 15.0;
+ if (overlay->outline_offset < MINIMUM_OUTLINE_OFFSET)
+ overlay->outline_offset = MINIMUM_OUTLINE_OFFSET;
+}
+
+#define CAIRO_UNPREMULTIPLY(a,r,g,b) G_STMT_START { \
+ b = (a > 0) ? MIN ((b * 255 + a / 2) / a, 255) : 0; \
+ g = (a > 0) ? MIN ((g * 255 + a / 2) / a, 255) : 0; \
+ r = (a > 0) ? MIN ((r * 255 + a / 2) / a, 255) : 0; \
+} G_STMT_END
+
+static inline void
+gst_base_text_overlay_blit_1 (GstBaseTextOverlay * overlay, guchar * dest,
+ gint xpos, gint ypos, guchar * text_image, guint dest_stride)
+{
+ gint i, j = 0;
+ gint x, y;
+ guchar r, g, b, a;
+ guchar *pimage;
+ guchar *py;
+ gint width = overlay->image_width;
+ gint height = overlay->image_height;
+
+ if (xpos < 0) {
+ xpos = 0;
+ }
+
+ if (xpos + width > overlay->width) {
+ width = overlay->width - xpos;
+ }
+
+ if (ypos + height > overlay->height) {
+ height = overlay->height - ypos;
+ }
+
+ dest += (ypos / 1) * dest_stride;
+
+ for (i = 0; i < height; i++) {
+ pimage = text_image + 4 * (i * overlay->image_width);
+ py = dest + i * dest_stride + xpos;
+ for (j = 0; j < width; j++) {
+ b = pimage[CAIRO_ARGB_B];
+ g = pimage[CAIRO_ARGB_G];
+ r = pimage[CAIRO_ARGB_R];
+ a = pimage[CAIRO_ARGB_A];
+ CAIRO_UNPREMULTIPLY (a, r, g, b);
+
+ pimage += 4;
+ if (a == 0) {
+ py++;
+ continue;
+ }
+ COMP_Y (y, r, g, b);
+ x = *py;
+ BLEND (*py++, a, y, x);
+ }
+ }
+}
+
+static inline void
+gst_base_text_overlay_blit_sub2x2cbcr (GstBaseTextOverlay * overlay,
+ guchar * destcb, guchar * destcr, gint xpos, gint ypos, guchar * text_image,
+ guint destcb_stride, guint destcr_stride, guint pix_stride)
+{
+ gint i, j;
+ gint x, cb, cr;
+ gushort r, g, b, a;
+ gushort r1, g1, b1, a1;
+ guchar *pimage1, *pimage2;
+ guchar *pcb, *pcr;
+ gint width = overlay->image_width - 2;
+ gint height = overlay->image_height - 2;
+
+ xpos *= pix_stride;
+
+ if (xpos < 0) {
+ xpos = 0;
+ }
+
+ if (xpos + width > overlay->width) {
+ width = overlay->width - xpos;
+ }
+
+ if (ypos + height > overlay->height) {
+ height = overlay->height - ypos;
+ }
+
+ destcb += (ypos / 2) * destcb_stride;
+ destcr += (ypos / 2) * destcr_stride;
+
+ for (i = 0; i < height; i += 2) {
+ pimage1 = text_image + 4 * (i * overlay->image_width);
+ pimage2 = pimage1 + 4 * overlay->image_width;
+ pcb = destcb + (i / 2) * destcb_stride + xpos / 2;
+ pcr = destcr + (i / 2) * destcr_stride + xpos / 2;
+ for (j = 0; j < width; j += 2) {
+ b = pimage1[CAIRO_ARGB_B];
+ g = pimage1[CAIRO_ARGB_G];
+ r = pimage1[CAIRO_ARGB_R];
+ a = pimage1[CAIRO_ARGB_A];
+ CAIRO_UNPREMULTIPLY (a, r, g, b);
+ pimage1 += 4;
+
+ b1 = pimage1[CAIRO_ARGB_B];
+ g1 = pimage1[CAIRO_ARGB_G];
+ r1 = pimage1[CAIRO_ARGB_R];
+ a1 = pimage1[CAIRO_ARGB_A];
+ CAIRO_UNPREMULTIPLY (a1, r1, g1, b1);
+ b += b1;
+ g += g1;
+ r += r1;
+ a += a1;
+ pimage1 += 4;
+
+ b1 = pimage2[CAIRO_ARGB_B];
+ g1 = pimage2[CAIRO_ARGB_G];
+ r1 = pimage2[CAIRO_ARGB_R];
+ a1 = pimage2[CAIRO_ARGB_A];
+ CAIRO_UNPREMULTIPLY (a1, r1, g1, b1);
+ b += b1;
+ g += g1;
+ r += r1;
+ a += a1;
+ pimage2 += 4;
+
+ /* + 2 for rounding */
+ b1 = pimage2[CAIRO_ARGB_B];
+ g1 = pimage2[CAIRO_ARGB_G];
+ r1 = pimage2[CAIRO_ARGB_R];
+ a1 = pimage2[CAIRO_ARGB_A];
+ CAIRO_UNPREMULTIPLY (a1, r1, g1, b1);
+ b += b1 + 2;
+ g += g1 + 2;
+ r += r1 + 2;
+ a += a1 + 2;
+ pimage2 += 4;
+
+ b /= 4;
+ g /= 4;
+ r /= 4;
+ a /= 4;
+
+ if (a == 0) {
+ pcb += pix_stride;
+ pcr += pix_stride;
+ continue;
+ }
+ COMP_U (cb, r, g, b);
+ COMP_V (cr, r, g, b);
+
+ x = *pcb;
+ BLEND (*pcb, a, cb, x);
+ x = *pcr;
+ BLEND (*pcr, a, cr, x);
+
+ pcb += pix_stride;
+ pcr += pix_stride;
+ }
+ }
+}
+
+static void
+gst_base_text_overlay_render_pangocairo (GstBaseTextOverlay * overlay,
+ const gchar * string, gint textlen)
+{
+ cairo_t *cr;
+ cairo_surface_t *surface;
+ PangoRectangle ink_rect, logical_rect;
+ cairo_matrix_t cairo_matrix;
+ int width, height;
+ double scalef = 1.0;
+ double a, r, g, b;
+
+ g_mutex_lock (GST_BASE_TEXT_OVERLAY_GET_CLASS (overlay)->pango_lock);
+
+ if (overlay->auto_adjust_size) {
+ /* 640 pixel is default */
+ scalef = (double) (overlay->width) / DEFAULT_SCALE_BASIS;
+ }
+ pango_layout_set_width (overlay->layout, -1);
+ /* set text on pango layout */
+ pango_layout_set_markup (overlay->layout, string, textlen);
+
+ /* get subtitle image size */
+ pango_layout_get_pixel_extents (overlay->layout, &ink_rect, &logical_rect);
+
+ width = (logical_rect.width + overlay->shadow_offset) * scalef;
+
+ if (width + overlay->deltax >
+ (overlay->use_vertical_render ? overlay->height : overlay->width)) {
+ /*
+ * subtitle image width is larger then overlay width
+ * so rearrange overlay wrap mode.
+ */
+ gst_base_text_overlay_update_wrap_mode (overlay);
+ pango_layout_get_pixel_extents (overlay->layout, &ink_rect, &logical_rect);
+ width = overlay->width;
+ }
+
+ height =
+ (logical_rect.height + logical_rect.y + overlay->shadow_offset) * scalef;
+ if (height > overlay->height) {
+ height = overlay->height;
+ }
+ if (overlay->use_vertical_render) {
+ PangoRectangle rect;
+ PangoContext *context;
+ PangoMatrix matrix = PANGO_MATRIX_INIT;
+ int tmp;
+
+ context = pango_layout_get_context (overlay->layout);
+
+ pango_matrix_rotate (&matrix, -90);
+
+ rect.x = rect.y = 0;
+ rect.width = width;
+ rect.height = height;
+ pango_matrix_transform_pixel_rectangle (&matrix, &rect);
+ matrix.x0 = -rect.x;
+ matrix.y0 = -rect.y;
+
+ pango_context_set_matrix (context, &matrix);
+
+ cairo_matrix.xx = matrix.xx;
+ cairo_matrix.yx = matrix.yx;
+ cairo_matrix.xy = matrix.xy;
+ cairo_matrix.yy = matrix.yy;
+ cairo_matrix.x0 = matrix.x0;
+ cairo_matrix.y0 = matrix.y0;
+ cairo_matrix_scale (&cairo_matrix, scalef, scalef);
+
+ tmp = height;
+ height = width;
+ width = tmp;
+ } else {
+ cairo_matrix_init_scale (&cairo_matrix, scalef, scalef);
+ }
+
+ /* reallocate surface */
+ overlay->text_image = g_realloc (overlay->text_image, 4 * width * height);
+
+ surface = cairo_image_surface_create_for_data (overlay->text_image,
+ CAIRO_FORMAT_ARGB32, width, height, width * 4);
+ cr = cairo_create (surface);
+
+ /* clear surface */
+ cairo_set_operator (cr, CAIRO_OPERATOR_CLEAR);
+ cairo_paint (cr);
+
+ cairo_set_operator (cr, CAIRO_OPERATOR_OVER);
+
+ if (overlay->want_shading)
+ cairo_paint_with_alpha (cr, overlay->shading_value);
+
+ /* apply transformations */
+ cairo_set_matrix (cr, &cairo_matrix);
+
+ /* FIXME: We use show_layout everywhere except for the surface
+ * because it's really faster and internally does all kinds of
+ * caching. Unfortunately we have to paint to a cairo path for
+ * the outline and this is slow. Once Pango supports user fonts
+ * we should use them, see
+ * https://bugzilla.gnome.org/show_bug.cgi?id=598695
+ *
+ * Idea would the be, to create a cairo user font that
+ * does shadow, outline, text painting in the
+ * render_glyph function.
+ */
+
+ /* draw shadow text */
+ cairo_save (cr);
+ cairo_translate (cr, overlay->shadow_offset, overlay->shadow_offset);
+ cairo_set_source_rgba (cr, 0.0, 0.0, 0.0, 0.5);
+ pango_cairo_show_layout (cr, overlay->layout);
+ cairo_restore (cr);
+
+ a = (overlay->outline_color >> 24) & 0xff;
+ r = (overlay->outline_color >> 16) & 0xff;
+ g = (overlay->outline_color >> 8) & 0xff;
+ b = (overlay->outline_color >> 0) & 0xff;
+
+ /* draw outline text */
+ cairo_save (cr);
+ cairo_set_source_rgba (cr, r / 255.0, g / 255.0, b / 255.0, a / 255.0);
+ cairo_set_line_width (cr, overlay->outline_offset);
+ pango_cairo_layout_path (cr, overlay->layout);
+ cairo_stroke (cr);
+ cairo_restore (cr);
+
+ a = (overlay->color >> 24) & 0xff;
+ r = (overlay->color >> 16) & 0xff;
+ g = (overlay->color >> 8) & 0xff;
+ b = (overlay->color >> 0) & 0xff;
+
+ /* draw text */
+ cairo_save (cr);
+ cairo_set_source_rgba (cr, r / 255.0, g / 255.0, b / 255.0, a / 255.0);
+ pango_cairo_show_layout (cr, overlay->layout);
+ cairo_restore (cr);
+
+ cairo_destroy (cr);
+ cairo_surface_destroy (surface);
+ overlay->image_width = width;
+ overlay->image_height = height;
+ overlay->baseline_y = ink_rect.y;
+ g_mutex_unlock (GST_BASE_TEXT_OVERLAY_GET_CLASS (overlay)->pango_lock);
+}
+
+#define BOX_XPAD 6
+#define BOX_YPAD 6
+
+static inline void
+gst_base_text_overlay_shade_planar_Y (GstBaseTextOverlay * overlay,
+ GstVideoFrame * dest, gint x0, gint x1, gint y0, gint y1)
+{
+ gint i, j, dest_stride;
+ guint8 *dest_ptr;
+
+ dest_stride = dest->info.stride[0];
+ dest_ptr = dest->data[0];
+
+ x0 = CLAMP (x0 - BOX_XPAD, 0, overlay->width);
+ x1 = CLAMP (x1 + BOX_XPAD, 0, overlay->width);
+
+ y0 = CLAMP (y0 - BOX_YPAD, 0, overlay->height);
+ y1 = CLAMP (y1 + BOX_YPAD, 0, overlay->height);
+
+ for (i = y0; i < y1; ++i) {
+ for (j = x0; j < x1; ++j) {
+ gint y = dest_ptr[(i * dest_stride) + j] + overlay->shading_value;
+
+ dest_ptr[(i * dest_stride) + j] = CLAMP (y, 0, 255);
+ }
+ }
+}
+
+static inline void
+gst_base_text_overlay_shade_packed_Y (GstBaseTextOverlay * overlay,
+ GstVideoFrame * dest, gint x0, gint x1, gint y0, gint y1)
+{
+ gint i, j;
+ guint dest_stride, pixel_stride;
+ guint8 *dest_ptr;
+
+ dest_stride = GST_VIDEO_FRAME_COMP_STRIDE (dest, 0);
+ dest_ptr = GST_VIDEO_FRAME_COMP_DATA (dest, 0);
+ pixel_stride = GST_VIDEO_FRAME_COMP_PSTRIDE (dest, 0);
+
+ x0 = CLAMP (x0 - BOX_XPAD, 0, overlay->width);
+ x1 = CLAMP (x1 + BOX_XPAD, 0, overlay->width);
+
+ y0 = CLAMP (y0 - BOX_YPAD, 0, overlay->height);
+ y1 = CLAMP (y1 + BOX_YPAD, 0, overlay->height);
+
+ if (x0 != 0)
+ x0 = GST_VIDEO_FORMAT_INFO_SCALE_WIDTH (dest->info.finfo, 0, x0);
+ if (x1 != 0)
+ x1 = GST_VIDEO_FORMAT_INFO_SCALE_WIDTH (dest->info.finfo, 0, x1);
+
+ if (y0 != 0)
+ y0 = GST_VIDEO_FORMAT_INFO_SCALE_HEIGHT (dest->info.finfo, 0, y0);
+ if (y1 != 0)
+ y1 = GST_VIDEO_FORMAT_INFO_SCALE_HEIGHT (dest->info.finfo, 0, y1);
+
+ for (i = y0; i < y1; i++) {
+ for (j = x0; j < x1; j++) {
+ gint y;
+ gint y_pos;
+
+ y_pos = (i * dest_stride) + j * pixel_stride;
+ y = dest_ptr[y_pos] + overlay->shading_value;
+
+ dest_ptr[y_pos] = CLAMP (y, 0, 255);
+ }
+ }
+}
+
+#define gst_base_text_overlay_shade_BGRx gst_base_text_overlay_shade_xRGB
+#define gst_base_text_overlay_shade_RGBx gst_base_text_overlay_shade_xRGB
+#define gst_base_text_overlay_shade_xBGR gst_base_text_overlay_shade_xRGB
+static inline void
+gst_base_text_overlay_shade_xRGB (GstBaseTextOverlay * overlay,
+ GstVideoFrame * dest, gint x0, gint x1, gint y0, gint y1)
+{
+ gint i, j;
+ guint8 *dest_ptr;
+
+ dest_ptr = dest->data[0];
+
+ x0 = CLAMP (x0 - BOX_XPAD, 0, overlay->width);
+ x1 = CLAMP (x1 + BOX_XPAD, 0, overlay->width);
+
+ y0 = CLAMP (y0 - BOX_YPAD, 0, overlay->height);
+ y1 = CLAMP (y1 + BOX_YPAD, 0, overlay->height);
+
+ for (i = y0; i < y1; i++) {
+ for (j = x0; j < x1; j++) {
+ gint y, y_pos, k;
+
+ y_pos = (i * 4 * overlay->width) + j * 4;
+ for (k = 0; k < 4; k++) {
+ y = dest_ptr[y_pos + k] + overlay->shading_value;
+ dest_ptr[y_pos + k] = CLAMP (y, 0, 255);
+ }
+ }
+ }
+}
+
+#define ARGB_SHADE_FUNCTION(name, OFFSET) \
+static inline void \
+gst_base_text_overlay_shade_##name (GstBaseTextOverlay * overlay, GstVideoFrame * dest, \
+gint x0, gint x1, gint y0, gint y1) \
+{ \
+ gint i, j;\
+ guint8 *dest_ptr;\
+ \
+ dest_ptr = dest->data[0];\
+ \
+ x0 = CLAMP (x0 - BOX_XPAD, 0, overlay->width);\
+ x1 = CLAMP (x1 + BOX_XPAD, 0, overlay->width);\
+ \
+ y0 = CLAMP (y0 - BOX_YPAD, 0, overlay->height);\
+ y1 = CLAMP (y1 + BOX_YPAD, 0, overlay->height);\
+ \
+ for (i = y0; i < y1; i++) {\
+ for (j = x0; j < x1; j++) {\
+ gint y, y_pos, k;\
+ y_pos = (i * 4 * overlay->width) + j * 4;\
+ for (k = OFFSET; k < 3+OFFSET; k++) {\
+ y = dest_ptr[y_pos + k] + overlay->shading_value;\
+ dest_ptr[y_pos + k] = CLAMP (y, 0, 255);\
+ }\
+ }\
+ }\
+}
+ARGB_SHADE_FUNCTION (ARGB, 1);
+ARGB_SHADE_FUNCTION (ABGR, 1);
+ARGB_SHADE_FUNCTION (RGBA, 0);
+ARGB_SHADE_FUNCTION (BGRA, 0);
+
+
+/* FIXME:
+ * - use proper strides and offset for I420
+ * - don't draw over the edge of the picture (try a longer
+ * text with a huge font size)
+ */
+
+static inline void
+gst_base_text_overlay_blit_NV12_NV21 (GstBaseTextOverlay * overlay,
+ GstVideoFrame * dest, gint xpos, gint ypos)
+{
+ int y_stride, u_stride, v_stride;
+ guint8 *y_pixels, *u_pixels, *v_pixels;
+
+ /* because U/V is 2x2 subsampled, we need to round, either up or down,
+ * to a boundary of integer number of U/V pixels:
+ */
+ xpos = GST_ROUND_UP_2 (xpos);
+ ypos = GST_ROUND_UP_2 (ypos);
+
+ y_pixels = dest->data[0];
+ u_pixels = dest->data[1];
+ v_pixels = dest->data[2];
+ y_stride = dest->info.stride[0];
+ u_stride = dest->info.stride[1];
+ v_stride = dest->info.stride[2];
+
+ gst_base_text_overlay_blit_1 (overlay, y_pixels, xpos, ypos,
+ overlay->text_image, y_stride);
+ gst_base_text_overlay_blit_sub2x2cbcr (overlay, u_pixels,
+ v_pixels, xpos, ypos, overlay->text_image, u_stride, v_stride, 2);
+}
+
+static inline void
+gst_base_text_overlay_blit_I420 (GstBaseTextOverlay * overlay,
+ GstVideoFrame * dest, gint xpos, gint ypos)
+{
+ int y_stride, u_stride, v_stride;
+ guint8 *y_pixels, *u_pixels, *v_pixels;
+
+ /* because U/V is 2x2 subsampled, we need to round, either up or down,
+ * to a boundary of integer number of U/V pixels:
+ */
+ xpos = GST_ROUND_UP_2 (xpos);
+ ypos = GST_ROUND_UP_2 (ypos);
+
+ y_pixels = dest->data[0];
+ u_pixels = dest->data[1];
+ v_pixels = dest->data[2];
+ y_stride = dest->info.stride[0];
+ u_stride = dest->info.stride[1];
+ v_stride = dest->info.stride[2];
+
+ gst_base_text_overlay_blit_1 (overlay, y_pixels, xpos, ypos,
+ overlay->text_image, y_stride);
+ gst_base_text_overlay_blit_sub2x2cbcr (overlay, u_pixels,
+ v_pixels, xpos, ypos, overlay->text_image, u_stride, v_stride, 1);
+}
+
+static inline void
+gst_base_text_overlay_blit_UYVY (GstBaseTextOverlay * overlay,
+ GstVideoFrame * dest, gint xpos, gint ypos)
+{
+ int a0, r0, g0, b0;
+ int a1, r1, g1, b1;
+ int y0, y1, u, v;
+ int i, j;
+ int h, w;
+ guchar *pimage, *dest_ptr;
+ guint8 *yuv_pixels;
+
+ yuv_pixels = dest->data[0];
+
+ /* because U/V is 2x horizontally subsampled, we need to round to a
+ * boundary of integer number of U/V pixels in x dimension:
+ */
+ xpos = GST_ROUND_UP_2 (xpos);
+
+ w = overlay->image_width - 2;
+ h = overlay->image_height - 2;
+
+ if (xpos < 0) {
+ xpos = 0;
+ }
+
+ if (xpos + w > overlay->width) {
+ w = overlay->width - xpos;
+ }
+
+ if (ypos + h > overlay->height) {
+ h = overlay->height - ypos;
+ }
+
+ for (i = 0; i < h; i++) {
+ pimage = overlay->text_image + i * overlay->image_width * 4;
+ dest_ptr = yuv_pixels + (i + ypos) * overlay->width * 2 + xpos * 2;
+ for (j = 0; j < w; j += 2) {
+ b0 = pimage[CAIRO_ARGB_B];
+ g0 = pimage[CAIRO_ARGB_G];
+ r0 = pimage[CAIRO_ARGB_R];
+ a0 = pimage[CAIRO_ARGB_A];
+ CAIRO_UNPREMULTIPLY (a0, r0, g0, b0);
+ pimage += 4;
+
+ b1 = pimage[CAIRO_ARGB_B];
+ g1 = pimage[CAIRO_ARGB_G];
+ r1 = pimage[CAIRO_ARGB_R];
+ a1 = pimage[CAIRO_ARGB_A];
+ CAIRO_UNPREMULTIPLY (a1, r1, g1, b1);
+ pimage += 4;
+
+ a0 += a1 + 2;
+ a0 /= 2;
+ if (a0 == 0) {
+ dest_ptr += 4;
+ continue;
+ }
+
+ COMP_Y (y0, r0, g0, b0);
+ COMP_Y (y1, r1, g1, b1);
+
+ b0 += b1 + 2;
+ g0 += g1 + 2;
+ r0 += r1 + 2;
+
+ b0 /= 2;
+ g0 /= 2;
+ r0 /= 2;
+
+ COMP_U (u, r0, g0, b0);
+ COMP_V (v, r0, g0, b0);
+
+ BLEND (*dest_ptr, a0, u, *dest_ptr);
+ dest_ptr++;
+ BLEND (*dest_ptr, a0, y0, *dest_ptr);
+ dest_ptr++;
+ BLEND (*dest_ptr, a0, v, *dest_ptr);
+ dest_ptr++;
+ BLEND (*dest_ptr, a0, y1, *dest_ptr);
+ dest_ptr++;
+ }
+ }
+}
+
+static inline void
+gst_base_text_overlay_blit_AYUV (GstBaseTextOverlay * overlay,
+ GstVideoFrame * dest, gint xpos, gint ypos)
+{
+ int a, r, g, b, a1;
+ int y, u, v;
+ int i, j;
+ int h, w;
+ guchar *pimage, *dest_ptr;
+ guint8 *rgb_pixels;
+
+ rgb_pixels = dest->data[0];
+
+ w = overlay->image_width;
+ h = overlay->image_height;
+
+ if (xpos < 0) {
+ xpos = 0;
+ }
+
+ if (xpos + w > overlay->width) {
+ w = overlay->width - xpos;
+ }
+
+ if (ypos + h > overlay->height) {
+ h = overlay->height - ypos;
+ }
+
+ for (i = 0; i < h; i++) {
+ pimage = overlay->text_image + i * overlay->image_width * 4;
+ dest_ptr = rgb_pixels + (i + ypos) * 4 * overlay->width + xpos * 4;
+ for (j = 0; j < w; j++) {
+ a = pimage[CAIRO_ARGB_A];
+ b = pimage[CAIRO_ARGB_B];
+ g = pimage[CAIRO_ARGB_G];
+ r = pimage[CAIRO_ARGB_R];
+
+ CAIRO_UNPREMULTIPLY (a, r, g, b);
+
+ // convert background to yuv
+ COMP_Y (y, r, g, b);
+ COMP_U (u, r, g, b);
+ COMP_V (v, r, g, b);
+
+ // preform text "OVER" background alpha compositing
+ a1 = a + (dest_ptr[0] * (255 - a)) / 255 + 1; // add 1 to prevent divide by 0
+ OVER (dest_ptr[1], a, y, dest_ptr[0], dest_ptr[1], a1);
+ OVER (dest_ptr[2], a, u, dest_ptr[0], dest_ptr[2], a1);
+ OVER (dest_ptr[3], a, v, dest_ptr[0], dest_ptr[3], a1);
+ dest_ptr[0] = a1 - 1; // remove the temporary 1 we added
+
+ pimage += 4;
+ dest_ptr += 4;
+ }
+ }
+}
+
+#define xRGB_BLIT_FUNCTION(name, R, G, B) \
+static inline void \
+gst_base_text_overlay_blit_##name (GstBaseTextOverlay * overlay, \
+ GstVideoFrame * dest, gint xpos, gint ypos) \
+{ \
+ int a, r, g, b; \
+ int i, j; \
+ int h, w; \
+ guchar *pimage, *dest_ptr; \
+ guint8 *rgb_pixels;\
+ \
+ rgb_pixels = dest->data[0];\
+ \
+ w = overlay->image_width; \
+ h = overlay->image_height; \
+ \
+ if (xpos < 0) { \
+ xpos = 0; \
+ } \
+ \
+ if (xpos + w > overlay->width) { \
+ w = overlay->width - xpos; \
+ } \
+ \
+ if (ypos + h > overlay->height) { \
+ h = overlay->height - ypos; \
+ } \
+ \
+ for (i = 0; i < h; i++) { \
+ pimage = overlay->text_image + i * overlay->image_width * 4; \
+ dest_ptr = rgb_pixels + (i + ypos) * 4 * overlay->width + xpos * 4; \
+ for (j = 0; j < w; j++) { \
+ a = pimage[CAIRO_ARGB_A]; \
+ b = pimage[CAIRO_ARGB_B]; \
+ g = pimage[CAIRO_ARGB_G]; \
+ r = pimage[CAIRO_ARGB_R]; \
+ CAIRO_UNPREMULTIPLY (a, r, g, b); \
+ b = (b*a + dest_ptr[B] * (255-a)) / 255; \
+ g = (g*a + dest_ptr[G] * (255-a)) / 255; \
+ r = (r*a + dest_ptr[R] * (255-a)) / 255; \
+ \
+ dest_ptr[B] = b; \
+ dest_ptr[G] = g; \
+ dest_ptr[R] = r; \
+ pimage += 4; \
+ dest_ptr += 4; \
+ } \
+ } \
+}
+xRGB_BLIT_FUNCTION (xRGB, 1, 2, 3);
+xRGB_BLIT_FUNCTION (BGRx, 2, 1, 0);
+xRGB_BLIT_FUNCTION (xBGR, 3, 2, 1);
+xRGB_BLIT_FUNCTION (RGBx, 0, 1, 2);
+
+#define ARGB_BLIT_FUNCTION(name, A, R, G, B) \
+static inline void \
+gst_base_text_overlay_blit_##name (GstBaseTextOverlay * overlay, \
+ GstVideoFrame * dest, gint xpos, gint ypos) \
+{ \
+ int a, r, g, b, a1; \
+ int i, j; \
+ int h, w; \
+ guchar *pimage, *dest_ptr; \
+ guint8 *rgb_pixels;\
+ \
+ rgb_pixels = dest->data[0];\
+ \
+ w = overlay->image_width; \
+ h = overlay->image_height; \
+ \
+ if (xpos < 0) { \
+ xpos = 0; \
+ } \
+ \
+ if (xpos + w > overlay->width) { \
+ w = overlay->width - xpos; \
+ } \
+ \
+ if (ypos + h > overlay->height) { \
+ h = overlay->height - ypos; \
+ } \
+ \
+ for (i = 0; i < h; i++) { \
+ pimage = overlay->text_image + i * overlay->image_width * 4; \
+ dest_ptr = rgb_pixels + (i + ypos) * 4 * overlay->width + xpos * 4; \
+ for (j = 0; j < w; j++) { \
+ a = pimage[CAIRO_ARGB_A]; \
+ b = pimage[CAIRO_ARGB_B]; \
+ g = pimage[CAIRO_ARGB_G]; \
+ r = pimage[CAIRO_ARGB_R]; \
+ CAIRO_UNPREMULTIPLY (a, r, g, b); \
+ a1 = a + (dest_ptr[A] * (255 - a)) / 255 + 1; \
+ OVER (dest_ptr[R], a, r, dest_ptr[0], dest_ptr[R], a1); \
+ OVER (dest_ptr[G], a, g, dest_ptr[0], dest_ptr[G], a1); \
+ OVER (dest_ptr[B], a, b, dest_ptr[0], dest_ptr[B], a1); \
+ dest_ptr[A] = a1 - 1; \
+ pimage += 4; \
+ dest_ptr += 4; \
+ } \
+ } \
+}
+ARGB_BLIT_FUNCTION (RGBA, 3, 0, 1, 2);
+ARGB_BLIT_FUNCTION (BGRA, 3, 2, 1, 0);
+ARGB_BLIT_FUNCTION (ARGB, 0, 1, 2, 3);
+ARGB_BLIT_FUNCTION (ABGR, 0, 3, 2, 1);
+
+static void
+gst_base_text_overlay_render_text (GstBaseTextOverlay * overlay,
+ const gchar * text, gint textlen)
+{
+ gchar *string;
+
+ if (!overlay->need_render) {
+ GST_DEBUG ("Using previously rendered text.");
+ return;
+ }
+
+ /* -1 is the whole string */
+ if (text != NULL && textlen < 0) {
+ textlen = strlen (text);
+ }
+
+ if (text != NULL) {
+ string = g_strndup (text, textlen);
+ } else { /* empty string */
+ string = g_strdup (" ");
+ }
+ g_strdelimit (string, "\r\t", ' ');
+ textlen = strlen (string);
+
+ /* FIXME: should we check for UTF-8 here? */
+
+ GST_DEBUG ("Rendering '%s'", string);
+ gst_base_text_overlay_render_pangocairo (overlay, string, textlen);
+
+ g_free (string);
+
+ overlay->need_render = FALSE;
+}
+
+static GstFlowReturn
+gst_base_text_overlay_push_frame (GstBaseTextOverlay * overlay,
+ GstBuffer * video_frame)
+{
+ gint xpos, ypos;
+ gint width, height;
+ GstBaseTextOverlayVAlign valign;
+ GstBaseTextOverlayHAlign halign;
+ GstVideoFrame frame;
+
+ width = overlay->image_width;
+ height = overlay->image_height;
+
+ video_frame = gst_buffer_make_writable (video_frame);
+
+ if (!gst_video_frame_map (&frame, &overlay->info, video_frame, GST_MAP_WRITE))
+ goto invalid_frame;
+
+ if (overlay->use_vertical_render)
+ halign = GST_BASE_TEXT_OVERLAY_HALIGN_RIGHT;
+ else
+ halign = overlay->halign;
+
+ switch (halign) {
+ case GST_BASE_TEXT_OVERLAY_HALIGN_LEFT:
+ xpos = overlay->xpad;
+ break;
+ case GST_BASE_TEXT_OVERLAY_HALIGN_CENTER:
+ xpos = (overlay->width - width) / 2;
+ break;
+ case GST_BASE_TEXT_OVERLAY_HALIGN_RIGHT:
+ xpos = overlay->width - width - overlay->xpad;
+ break;
+ case GST_BASE_TEXT_OVERLAY_HALIGN_POS:
+ xpos = (gint) (overlay->width * overlay->xpos) - width / 2;
+ xpos = CLAMP (xpos, 0, overlay->width - width);
+ if (xpos < 0)
+ xpos = 0;
+ break;
+ default:
+ xpos = 0;
+ }
+ xpos += overlay->deltax;
+
+ if (overlay->use_vertical_render)
+ valign = GST_BASE_TEXT_OVERLAY_VALIGN_TOP;
+ else
+ valign = overlay->valign;
+
+ switch (valign) {
+ case GST_BASE_TEXT_OVERLAY_VALIGN_BOTTOM:
+ ypos = overlay->height - height - overlay->ypad;
+ break;
+ case GST_BASE_TEXT_OVERLAY_VALIGN_BASELINE:
+ ypos = overlay->height - (height + overlay->ypad);
+ break;
+ case GST_BASE_TEXT_OVERLAY_VALIGN_TOP:
+ ypos = overlay->ypad;
+ break;
+ case GST_BASE_TEXT_OVERLAY_VALIGN_POS:
+ ypos = (gint) (overlay->height * overlay->ypos) - height / 2;
+ ypos = CLAMP (ypos, 0, overlay->height - height);
+ break;
+ case GST_BASE_TEXT_OVERLAY_VALIGN_CENTER:
+ ypos = (overlay->height - height) / 2;
+ break;
+ default:
+ ypos = overlay->ypad;
+ break;
+ }
+ ypos += overlay->deltay;
+
+ /* shaded background box */
+ if (overlay->want_shading) {
+ switch (overlay->format) {
+ case GST_VIDEO_FORMAT_I420:
+ case GST_VIDEO_FORMAT_NV12:
+ case GST_VIDEO_FORMAT_NV21:
+ gst_base_text_overlay_shade_planar_Y (overlay, &frame,
+ xpos, xpos + overlay->image_width,
+ ypos, ypos + overlay->image_height);
+ break;
+ case GST_VIDEO_FORMAT_AYUV:
+ case GST_VIDEO_FORMAT_UYVY:
+ gst_base_text_overlay_shade_packed_Y (overlay, &frame,
+ xpos, xpos + overlay->image_width,
+ ypos, ypos + overlay->image_height);
+ break;
+ case GST_VIDEO_FORMAT_xRGB:
+ gst_base_text_overlay_shade_xRGB (overlay, &frame,
+ xpos, xpos + overlay->image_width,
+ ypos, ypos + overlay->image_height);
+ break;
+ case GST_VIDEO_FORMAT_xBGR:
+ gst_base_text_overlay_shade_xBGR (overlay, &frame,
+ xpos, xpos + overlay->image_width,
+ ypos, ypos + overlay->image_height);
+ break;
+ case GST_VIDEO_FORMAT_BGRx:
+ gst_base_text_overlay_shade_BGRx (overlay, &frame,
+ xpos, xpos + overlay->image_width,
+ ypos, ypos + overlay->image_height);
+ break;
+ case GST_VIDEO_FORMAT_RGBx:
+ gst_base_text_overlay_shade_RGBx (overlay, &frame,
+ xpos, xpos + overlay->image_width,
+ ypos, ypos + overlay->image_height);
+ break;
+ case GST_VIDEO_FORMAT_ARGB:
+ gst_base_text_overlay_shade_ARGB (overlay, &frame,
+ xpos, xpos + overlay->image_width,
+ ypos, ypos + overlay->image_height);
+ break;
+ case GST_VIDEO_FORMAT_ABGR:
+ gst_base_text_overlay_shade_ABGR (overlay, &frame,
+ xpos, xpos + overlay->image_width,
+ ypos, ypos + overlay->image_height);
+ break;
+ case GST_VIDEO_FORMAT_RGBA:
+ gst_base_text_overlay_shade_RGBA (overlay, &frame,
+ xpos, xpos + overlay->image_width,
+ ypos, ypos + overlay->image_height);
+ break;
+ case GST_VIDEO_FORMAT_BGRA:
+ gst_base_text_overlay_shade_BGRA (overlay, &frame,
+ xpos, xpos + overlay->image_width,
+ ypos, ypos + overlay->image_height);
+ break;
+ default:
+ g_assert_not_reached ();
+ }
+ }
+
+ if (ypos < 0)
+ ypos = 0;
+
+ if (overlay->text_image) {
+ switch (overlay->format) {
+ case GST_VIDEO_FORMAT_I420:
+ gst_base_text_overlay_blit_I420 (overlay, &frame, xpos, ypos);
+ break;
+ case GST_VIDEO_FORMAT_NV12:
+ case GST_VIDEO_FORMAT_NV21:
+ gst_base_text_overlay_blit_NV12_NV21 (overlay, &frame, xpos, ypos);
+ break;
+ case GST_VIDEO_FORMAT_UYVY:
+ gst_base_text_overlay_blit_UYVY (overlay, &frame, xpos, ypos);
+ break;
+ case GST_VIDEO_FORMAT_AYUV:
+ gst_base_text_overlay_blit_AYUV (overlay, &frame, xpos, ypos);
+ break;
+ case GST_VIDEO_FORMAT_BGRx:
+ gst_base_text_overlay_blit_BGRx (overlay, &frame, xpos, ypos);
+ break;
+ case GST_VIDEO_FORMAT_xRGB:
+ gst_base_text_overlay_blit_xRGB (overlay, &frame, xpos, ypos);
+ break;
+ case GST_VIDEO_FORMAT_RGBx:
+ gst_base_text_overlay_blit_RGBx (overlay, &frame, xpos, ypos);
+ break;
+ case GST_VIDEO_FORMAT_xBGR:
+ gst_base_text_overlay_blit_xBGR (overlay, &frame, xpos, ypos);
+ break;
+ case GST_VIDEO_FORMAT_ARGB:
+ gst_base_text_overlay_blit_ARGB (overlay, &frame, xpos, ypos);
+ break;
+ case GST_VIDEO_FORMAT_ABGR:
+ gst_base_text_overlay_blit_ABGR (overlay, &frame, xpos, ypos);
+ break;
+ case GST_VIDEO_FORMAT_RGBA:
+ gst_base_text_overlay_blit_RGBA (overlay, &frame, xpos, ypos);
+ break;
+ case GST_VIDEO_FORMAT_BGRA:
+ gst_base_text_overlay_blit_BGRA (overlay, &frame, xpos, ypos);
+ break;
+ default:
+ g_assert_not_reached ();
+ }
+ }
+ gst_video_frame_unmap (&frame);
+
+ return gst_pad_push (overlay->srcpad, video_frame);
+
+ /* ERRORS */
+invalid_frame:
+ {
+ GST_DEBUG_OBJECT (overlay, "received invalid buffer");
+ return GST_FLOW_OK;
+ }
+}
+
+static GstPadLinkReturn
+gst_base_text_overlay_text_pad_link (GstPad * pad, GstPad * peer)
+{
+ GstBaseTextOverlay *overlay;
+
+ overlay = GST_BASE_TEXT_OVERLAY (gst_pad_get_parent (pad));
++ if (G_UNLIKELY (!overlay))
++ return GST_PAD_LINK_REFUSED;
+
+ GST_DEBUG_OBJECT (overlay, "Text pad linked");
+
+ overlay->text_linked = TRUE;
+
+ gst_object_unref (overlay);
+
+ return GST_PAD_LINK_OK;
+}
+
+static void
+gst_base_text_overlay_text_pad_unlink (GstPad * pad)
+{
+ GstBaseTextOverlay *overlay;
+
+ /* don't use gst_pad_get_parent() here, will deadlock */
+ overlay = GST_BASE_TEXT_OVERLAY (GST_PAD_PARENT (pad));
+
+ GST_DEBUG_OBJECT (overlay, "Text pad unlinked");
+
+ overlay->text_linked = FALSE;
+
+ gst_segment_init (&overlay->text_segment, GST_FORMAT_UNDEFINED);
+}
+
+static gboolean
+gst_base_text_overlay_text_event (GstPad * pad, GstEvent * event)
+{
+ gboolean ret = FALSE;
+ GstBaseTextOverlay *overlay = NULL;
+
+ overlay = GST_BASE_TEXT_OVERLAY (gst_pad_get_parent (pad));
++ if (G_UNLIKELY (!overlay)) {
++ gst_event_unref (event);
++ return FALSE;
++ }
+
+ GST_LOG_OBJECT (pad, "received event %s", GST_EVENT_TYPE_NAME (event));
+
+ switch (GST_EVENT_TYPE (event)) {
+ case GST_EVENT_CAPS:
+ {
+ GstCaps *caps;
+
+ gst_event_parse_caps (event, &caps);
+ ret = gst_base_text_overlay_setcaps_txt (overlay, caps);
+ gst_event_unref (event);
+ break;
+ }
+ case GST_EVENT_SEGMENT:
+ {
+ const GstSegment *segment;
+
+ overlay->text_eos = FALSE;
+
+ gst_event_parse_segment (event, &segment);
+
+ if (segment->format == GST_FORMAT_TIME) {
+ GST_OBJECT_LOCK (overlay);
+ gst_segment_copy_into (segment, &overlay->text_segment);
+ GST_DEBUG_OBJECT (overlay, "TEXT SEGMENT now: %" GST_SEGMENT_FORMAT,
+ &overlay->text_segment);
+ GST_OBJECT_UNLOCK (overlay);
+ } else {
+ GST_ELEMENT_WARNING (overlay, STREAM, MUX, (NULL),
+ ("received non-TIME newsegment event on text input"));
+ }
+
+ gst_event_unref (event);
+ ret = TRUE;
+
+ /* wake up the video chain, it might be waiting for a text buffer or
+ * a text segment update */
+ GST_OBJECT_LOCK (overlay);
+ GST_BASE_TEXT_OVERLAY_BROADCAST (overlay);
+ GST_OBJECT_UNLOCK (overlay);
+ break;
+ }
+ case GST_EVENT_FLUSH_STOP:
+ GST_OBJECT_LOCK (overlay);
+ GST_INFO_OBJECT (overlay, "text flush stop");
+ overlay->text_flushing = FALSE;
+ overlay->text_eos = FALSE;
+ gst_base_text_overlay_pop_text (overlay);
+ gst_segment_init (&overlay->text_segment, GST_FORMAT_TIME);
+ GST_OBJECT_UNLOCK (overlay);
+ gst_event_unref (event);
+ ret = TRUE;
+ break;
+ case GST_EVENT_FLUSH_START:
+ GST_OBJECT_LOCK (overlay);
+ GST_INFO_OBJECT (overlay, "text flush start");
+ overlay->text_flushing = TRUE;
+ GST_BASE_TEXT_OVERLAY_BROADCAST (overlay);
+ GST_OBJECT_UNLOCK (overlay);
+ gst_event_unref (event);
+ ret = TRUE;
+ break;
+ case GST_EVENT_EOS:
+ GST_OBJECT_LOCK (overlay);
+ overlay->text_eos = TRUE;
+ GST_INFO_OBJECT (overlay, "text EOS");
+ /* wake up the video chain, it might be waiting for a text buffer or
+ * a text segment update */
+ GST_BASE_TEXT_OVERLAY_BROADCAST (overlay);
+ GST_OBJECT_UNLOCK (overlay);
+ gst_event_unref (event);
+ ret = TRUE;
+ break;
+ default:
+ ret = gst_pad_event_default (pad, event);
+ break;
+ }
+
+ gst_object_unref (overlay);
+
+ return ret;
+}
+
+static gboolean
+gst_base_text_overlay_video_event (GstPad * pad, GstEvent * event)
+{
+ gboolean ret = FALSE;
+ GstBaseTextOverlay *overlay = NULL;
+
+ overlay = GST_BASE_TEXT_OVERLAY (gst_pad_get_parent (pad));
++ if (G_UNLIKELY (!overlay)) {
++ gst_event_unref (event);
++ return FALSE;
++ }
+
+ GST_DEBUG_OBJECT (pad, "received event %s", GST_EVENT_TYPE_NAME (event));
+
+ switch (GST_EVENT_TYPE (event)) {
+ case GST_EVENT_CAPS:
+ {
+ GstCaps *caps;
+
+ gst_event_parse_caps (event, &caps);
+ ret = gst_base_text_overlay_setcaps (overlay, caps);
+ gst_event_unref (event);
+ break;
+ }
+ case GST_EVENT_SEGMENT:
+ {
+ const GstSegment *segment;
+
+ GST_DEBUG_OBJECT (overlay, "received new segment");
+
+ gst_event_parse_segment (event, &segment);
+
+ if (segment->format == GST_FORMAT_TIME) {
+ GST_DEBUG_OBJECT (overlay, "VIDEO SEGMENT now: %" GST_SEGMENT_FORMAT,
+ &overlay->segment);
+
+ gst_segment_copy_into (segment, &overlay->segment);
+ } else {
+ GST_ELEMENT_WARNING (overlay, STREAM, MUX, (NULL),
+ ("received non-TIME newsegment event on video input"));
+ }
+
+ ret = gst_pad_event_default (pad, event);
+ break;
+ }
+ case GST_EVENT_EOS:
+ GST_OBJECT_LOCK (overlay);
+ GST_INFO_OBJECT (overlay, "video EOS");
+ overlay->video_eos = TRUE;
+ GST_OBJECT_UNLOCK (overlay);
+ ret = gst_pad_event_default (pad, event);
+ break;
+ case GST_EVENT_FLUSH_START:
+ GST_OBJECT_LOCK (overlay);
+ GST_INFO_OBJECT (overlay, "video flush start");
+ overlay->video_flushing = TRUE;
+ GST_BASE_TEXT_OVERLAY_BROADCAST (overlay);
+ GST_OBJECT_UNLOCK (overlay);
+ ret = gst_pad_event_default (pad, event);
+ break;
+ case GST_EVENT_FLUSH_STOP:
+ GST_OBJECT_LOCK (overlay);
+ GST_INFO_OBJECT (overlay, "video flush stop");
+ overlay->video_flushing = FALSE;
+ overlay->video_eos = FALSE;
+ gst_segment_init (&overlay->segment, GST_FORMAT_TIME);
+ GST_OBJECT_UNLOCK (overlay);
+ ret = gst_pad_event_default (pad, event);
+ break;
+ default:
+ ret = gst_pad_event_default (pad, event);
+ break;
+ }
+
+ gst_object_unref (overlay);
+
+ return ret;
+}
+
+/* Called with lock held */
+static void
+gst_base_text_overlay_pop_text (GstBaseTextOverlay * overlay)
+{
+ g_return_if_fail (GST_IS_BASE_TEXT_OVERLAY (overlay));
+
+ if (overlay->text_buffer) {
+ GST_DEBUG_OBJECT (overlay, "releasing text buffer %p",
+ overlay->text_buffer);
+ gst_buffer_unref (overlay->text_buffer);
+ overlay->text_buffer = NULL;
+ }
+
+ /* Let the text task know we used that buffer */
+ GST_BASE_TEXT_OVERLAY_BROADCAST (overlay);
+}
+
+/* We receive text buffers here. If they are out of segment we just ignore them.
+ If the buffer is in our segment we keep it internally except if another one
+ is already waiting here, in that case we wait that it gets kicked out */
+static GstFlowReturn
+gst_base_text_overlay_text_chain (GstPad * pad, GstBuffer * buffer)
+{
+ GstFlowReturn ret = GST_FLOW_OK;
+ GstBaseTextOverlay *overlay = NULL;
+ gboolean in_seg = FALSE;
+ guint64 clip_start = 0, clip_stop = 0;
+
+ overlay = GST_BASE_TEXT_OVERLAY (GST_PAD_PARENT (pad));
+
+ GST_OBJECT_LOCK (overlay);
+
+ if (overlay->text_flushing) {
+ GST_OBJECT_UNLOCK (overlay);
+ ret = GST_FLOW_WRONG_STATE;
+ GST_LOG_OBJECT (overlay, "text flushing");
+ goto beach;
+ }
+
+ if (overlay->text_eos) {
+ GST_OBJECT_UNLOCK (overlay);
+ ret = GST_FLOW_UNEXPECTED;
+ GST_LOG_OBJECT (overlay, "text EOS");
+ goto beach;
+ }
+
+ GST_LOG_OBJECT (overlay, "%" GST_SEGMENT_FORMAT " BUFFER: ts=%"
+ GST_TIME_FORMAT ", end=%" GST_TIME_FORMAT, &overlay->segment,
+ GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buffer)),
+ GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buffer) +
+ GST_BUFFER_DURATION (buffer)));
+
+ if (G_LIKELY (GST_BUFFER_TIMESTAMP_IS_VALID (buffer))) {
+ GstClockTime stop;
+
+ if (G_LIKELY (GST_BUFFER_DURATION_IS_VALID (buffer)))
+ stop = GST_BUFFER_TIMESTAMP (buffer) + GST_BUFFER_DURATION (buffer);
+ else
+ stop = GST_CLOCK_TIME_NONE;
+
+ in_seg = gst_segment_clip (&overlay->text_segment, GST_FORMAT_TIME,
+ GST_BUFFER_TIMESTAMP (buffer), stop, &clip_start, &clip_stop);
+ } else {
+ in_seg = TRUE;
+ }
+
+ if (in_seg) {
+ if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer))
+ GST_BUFFER_TIMESTAMP (buffer) = clip_start;
+ else if (GST_BUFFER_DURATION_IS_VALID (buffer))
+ GST_BUFFER_DURATION (buffer) = clip_stop - clip_start;
+
+ /* Wait for the previous buffer to go away */
+ while (overlay->text_buffer != NULL) {
+ GST_DEBUG ("Pad %s:%s has a buffer queued, waiting",
+ GST_DEBUG_PAD_NAME (pad));
+ GST_BASE_TEXT_OVERLAY_WAIT (overlay);
+ GST_DEBUG ("Pad %s:%s resuming", GST_DEBUG_PAD_NAME (pad));
+ if (overlay->text_flushing) {
+ GST_OBJECT_UNLOCK (overlay);
+ ret = GST_FLOW_WRONG_STATE;
+ goto beach;
+ }
+ }
+
+ if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer))
+ overlay->text_segment.position = clip_start;
+
+ overlay->text_buffer = buffer;
+ /* That's a new text buffer we need to render */
+ overlay->need_render = TRUE;
+
+ /* in case the video chain is waiting for a text buffer, wake it up */
+ GST_BASE_TEXT_OVERLAY_BROADCAST (overlay);
+ }
+
+ GST_OBJECT_UNLOCK (overlay);
+
+beach:
+
+ return ret;
+}
+
+static GstFlowReturn
+gst_base_text_overlay_video_chain (GstPad * pad, GstBuffer * buffer)
+{
+ GstBaseTextOverlayClass *klass;
+ GstBaseTextOverlay *overlay;
+ GstFlowReturn ret = GST_FLOW_OK;
+ gboolean in_seg = FALSE;
+ guint64 start, stop, clip_start = 0, clip_stop = 0;
+ gchar *text = NULL;
+
+ overlay = GST_BASE_TEXT_OVERLAY (GST_PAD_PARENT (pad));
+ klass = GST_BASE_TEXT_OVERLAY_GET_CLASS (overlay);
+
+ if (!GST_BUFFER_TIMESTAMP_IS_VALID (buffer))
+ goto missing_timestamp;
+
+ /* ignore buffers that are outside of the current segment */
+ start = GST_BUFFER_TIMESTAMP (buffer);
+
+ if (!GST_BUFFER_DURATION_IS_VALID (buffer)) {
+ stop = GST_CLOCK_TIME_NONE;
+ } else {
+ stop = start + GST_BUFFER_DURATION (buffer);
+ }
+
+ GST_LOG_OBJECT (overlay, "%" GST_SEGMENT_FORMAT " BUFFER: ts=%"
+ GST_TIME_FORMAT ", end=%" GST_TIME_FORMAT, &overlay->segment,
+ GST_TIME_ARGS (start), GST_TIME_ARGS (stop));
+
+ /* segment_clip() will adjust start unconditionally to segment_start if
+ * no stop time is provided, so handle this ourselves */
+ if (stop == GST_CLOCK_TIME_NONE && start < overlay->segment.start)
+ goto out_of_segment;
+
+ in_seg = gst_segment_clip (&overlay->segment, GST_FORMAT_TIME, start, stop,
+ &clip_start, &clip_stop);
+
+ if (!in_seg)
+ goto out_of_segment;
+
+ /* if the buffer is only partially in the segment, fix up stamps */
+ if (clip_start != start || (stop != -1 && clip_stop != stop)) {
+ GST_DEBUG_OBJECT (overlay, "clipping buffer timestamp/duration to segment");
+ buffer = gst_buffer_make_writable (buffer);
+ GST_BUFFER_TIMESTAMP (buffer) = clip_start;
+ if (stop != -1)
+ GST_BUFFER_DURATION (buffer) = clip_stop - clip_start;
+ }
+
+ /* now, after we've done the clipping, fix up end time if there's no
+ * duration (we only use those estimated values internally though, we
+ * don't want to set bogus values on the buffer itself) */
+ if (stop == -1) {
+ GstCaps *caps;
+ GstStructure *s;
+ gint fps_num, fps_denom;
+
+ /* FIXME, store this in setcaps */
+ caps = gst_pad_get_current_caps (pad);
+ s = gst_caps_get_structure (caps, 0);
+ if (gst_structure_get_fraction (s, "framerate", &fps_num, &fps_denom) &&
+ fps_num && fps_denom) {
+ GST_DEBUG_OBJECT (overlay, "estimating duration based on framerate");
+ stop = start + gst_util_uint64_scale_int (GST_SECOND, fps_denom, fps_num);
+ } else {
+ GST_WARNING_OBJECT (overlay, "no duration, assuming minimal duration");
+ stop = start + 1; /* we need to assume some interval */
+ }
+ gst_caps_unref (caps);
+ }
+
+ gst_object_sync_values (G_OBJECT (overlay), GST_BUFFER_TIMESTAMP (buffer));
+
+wait_for_text_buf:
+
+ GST_OBJECT_LOCK (overlay);
+
+ if (overlay->video_flushing)
+ goto flushing;
+
+ if (overlay->video_eos)
+ goto have_eos;
+
+ if (overlay->silent) {
+ GST_OBJECT_UNLOCK (overlay);
+ ret = gst_pad_push (overlay->srcpad, buffer);
+
+ /* Update position */
+ overlay->segment.position = clip_start;
+
+ return ret;
+ }
+
+ /* Text pad not linked, rendering internal text */
+ if (!overlay->text_linked) {
+ if (klass->get_text) {
+ text = klass->get_text (overlay, buffer);
+ } else {
+ text = g_strdup (overlay->default_text);
+ }
+
+ GST_LOG_OBJECT (overlay, "Text pad not linked, rendering default "
+ "text: '%s'", GST_STR_NULL (text));
+
+ GST_OBJECT_UNLOCK (overlay);
+
+ if (text != NULL && *text != '\0') {
+ /* Render and push */
+ gst_base_text_overlay_render_text (overlay, text, -1);
+ ret = gst_base_text_overlay_push_frame (overlay, buffer);
+ } else {
+ /* Invalid or empty string */
+ ret = gst_pad_push (overlay->srcpad, buffer);
+ }
+ } else {
+ /* Text pad linked, check if we have a text buffer queued */
+ if (overlay->text_buffer) {
+ gboolean pop_text = FALSE, valid_text_time = TRUE;
+ GstClockTime text_start = GST_CLOCK_TIME_NONE;
+ GstClockTime text_end = GST_CLOCK_TIME_NONE;
+ GstClockTime text_running_time = GST_CLOCK_TIME_NONE;
+ GstClockTime text_running_time_end = GST_CLOCK_TIME_NONE;
+ GstClockTime vid_running_time, vid_running_time_end;
+
+ /* if the text buffer isn't stamped right, pop it off the
+ * queue and display it for the current video frame only */
+ if (!GST_BUFFER_TIMESTAMP_IS_VALID (overlay->text_buffer) ||
+ !GST_BUFFER_DURATION_IS_VALID (overlay->text_buffer)) {
+ GST_WARNING_OBJECT (overlay,
+ "Got text buffer with invalid timestamp or duration");
+ pop_text = TRUE;
+ valid_text_time = FALSE;
+ } else {
+ text_start = GST_BUFFER_TIMESTAMP (overlay->text_buffer);
+ text_end = text_start + GST_BUFFER_DURATION (overlay->text_buffer);
+ }
+
+ vid_running_time =
+ gst_segment_to_running_time (&overlay->segment, GST_FORMAT_TIME,
+ start);
+ vid_running_time_end =
+ gst_segment_to_running_time (&overlay->segment, GST_FORMAT_TIME,
+ stop);
+
+ /* If timestamp and duration are valid */
+ if (valid_text_time) {
+ text_running_time =
+ gst_segment_to_running_time (&overlay->segment, GST_FORMAT_TIME,
+ text_start);
+ text_running_time_end =
+ gst_segment_to_running_time (&overlay->segment, GST_FORMAT_TIME,
+ text_end);
+ }
+
+ GST_LOG_OBJECT (overlay, "T: %" GST_TIME_FORMAT " - %" GST_TIME_FORMAT,
+ GST_TIME_ARGS (text_running_time),
+ GST_TIME_ARGS (text_running_time_end));
+ GST_LOG_OBJECT (overlay, "V: %" GST_TIME_FORMAT " - %" GST_TIME_FORMAT,
+ GST_TIME_ARGS (vid_running_time),
+ GST_TIME_ARGS (vid_running_time_end));
+
+ /* Text too old or in the future */
+ if (valid_text_time && text_running_time_end <= vid_running_time) {
+ /* text buffer too old, get rid of it and do nothing */
+ GST_LOG_OBJECT (overlay, "text buffer too old, popping");
+ pop_text = FALSE;
+ gst_base_text_overlay_pop_text (overlay);
+ GST_OBJECT_UNLOCK (overlay);
+ goto wait_for_text_buf;
+ } else if (valid_text_time && vid_running_time_end <= text_running_time) {
+ GST_LOG_OBJECT (overlay, "text in future, pushing video buf");
+ GST_OBJECT_UNLOCK (overlay);
+ /* Push the video frame */
+ ret = gst_pad_push (overlay->srcpad, buffer);
+ } else {
+ gchar *in_text, *otext;
+ gsize in_size, osize;
+
+ otext =
+ gst_buffer_map (overlay->text_buffer, &osize, NULL, GST_MAP_READ);
+ in_text = otext;
+ in_size = osize;
+
+ /* g_markup_escape_text() absolutely requires valid UTF8 input, it
+ * might crash otherwise. We don't fall back on GST_SUBTITLE_ENCODING
+ * here on purpose, this is something that needs fixing upstream */
+ if (!g_utf8_validate (in_text, in_size, NULL)) {
+ const gchar *end = NULL;
+
+ GST_WARNING_OBJECT (overlay, "received invalid UTF-8");
+ in_text = g_strndup (in_text, in_size);
+ while (!g_utf8_validate (in_text, in_size, &end) && end)
+ *((gchar *) end) = '*';
+ }
+
+ /* Get the string */
+ if (overlay->have_pango_markup) {
+ text = g_strndup (in_text, in_size);
+ } else {
+ text = g_markup_escape_text (in_text, in_size);
+ }
+
+ if (text != NULL && *text != '\0') {
+ gint text_len = strlen (text);
+
+ while (text_len > 0 && (text[text_len - 1] == '\n' ||
+ text[text_len - 1] == '\r')) {
+ --text_len;
+ }
+ GST_DEBUG_OBJECT (overlay, "Rendering text '%*s'", text_len, text);
+ gst_base_text_overlay_render_text (overlay, text, text_len);
+ } else {
+ GST_DEBUG_OBJECT (overlay, "No text to render (empty buffer)");
+ gst_base_text_overlay_render_text (overlay, " ", 1);
+ }
+ gst_buffer_unmap (overlay->text_buffer, otext, osize);
+
+ if (in_text != otext)
+ g_free (in_text);
+
+ GST_OBJECT_UNLOCK (overlay);
+ ret = gst_base_text_overlay_push_frame (overlay, buffer);
+
+ if (valid_text_time && text_running_time_end <= vid_running_time_end) {
+ GST_LOG_OBJECT (overlay, "text buffer not needed any longer");
+ pop_text = TRUE;
+ }
+ }
+ if (pop_text) {
+ GST_OBJECT_LOCK (overlay);
+ gst_base_text_overlay_pop_text (overlay);
+ GST_OBJECT_UNLOCK (overlay);
+ }
+ } else {
+ gboolean wait_for_text_buf = TRUE;
+
+ if (overlay->text_eos)
+ wait_for_text_buf = FALSE;
+
+ if (!overlay->wait_text)
+ wait_for_text_buf = FALSE;
+
+ /* Text pad linked, but no text buffer available - what now? */
+ if (overlay->text_segment.format == GST_FORMAT_TIME) {
+ GstClockTime text_start_running_time, text_position_running_time;
+ GstClockTime vid_running_time;
+
+ vid_running_time =
+ gst_segment_to_running_time (&overlay->segment, GST_FORMAT_TIME,
+ GST_BUFFER_TIMESTAMP (buffer));
+ text_start_running_time =
+ gst_segment_to_running_time (&overlay->text_segment,
+ GST_FORMAT_TIME, overlay->text_segment.start);
+ text_position_running_time =
+ gst_segment_to_running_time (&overlay->text_segment,
+ GST_FORMAT_TIME, overlay->text_segment.position);
+
+ if ((GST_CLOCK_TIME_IS_VALID (text_start_running_time) &&
+ vid_running_time < text_start_running_time) ||
+ (GST_CLOCK_TIME_IS_VALID (text_position_running_time) &&
+ vid_running_time < text_position_running_time)) {
+ wait_for_text_buf = FALSE;
+ }
+ }
+
+ if (wait_for_text_buf) {
+ GST_DEBUG_OBJECT (overlay, "no text buffer, need to wait for one");
+ GST_BASE_TEXT_OVERLAY_WAIT (overlay);
+ GST_DEBUG_OBJECT (overlay, "resuming");
+ GST_OBJECT_UNLOCK (overlay);
+ goto wait_for_text_buf;
+ } else {
+ GST_OBJECT_UNLOCK (overlay);
+ GST_LOG_OBJECT (overlay, "no need to wait for a text buffer");
+ ret = gst_pad_push (overlay->srcpad, buffer);
+ }
+ }
+ }
+
+ g_free (text);
+
+ /* Update position */
+ overlay->segment.position = clip_start;
+
+ return ret;
+
+missing_timestamp:
+ {
+ GST_WARNING_OBJECT (overlay, "buffer without timestamp, discarding");
+ gst_buffer_unref (buffer);
+ return GST_FLOW_OK;
+ }
+
+flushing:
+ {
+ GST_OBJECT_UNLOCK (overlay);
+ GST_DEBUG_OBJECT (overlay, "flushing, discarding buffer");
+ gst_buffer_unref (buffer);
+ return GST_FLOW_WRONG_STATE;
+ }
+have_eos:
+ {
+ GST_OBJECT_UNLOCK (overlay);
+ GST_DEBUG_OBJECT (overlay, "eos, discarding buffer");
+ gst_buffer_unref (buffer);
+ return GST_FLOW_UNEXPECTED;
+ }
+out_of_segment:
+ {
+ GST_DEBUG_OBJECT (overlay, "buffer out of segment, discarding");
+ gst_buffer_unref (buffer);
+ return GST_FLOW_OK;
+ }
+}
+
+static GstStateChangeReturn
+gst_base_text_overlay_change_state (GstElement * element,
+ GstStateChange transition)
+{
+ GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
+ GstBaseTextOverlay *overlay = GST_BASE_TEXT_OVERLAY (element);
+
+ switch (transition) {
+ case GST_STATE_CHANGE_PAUSED_TO_READY:
+ GST_OBJECT_LOCK (overlay);
+ overlay->text_flushing = TRUE;
+ overlay->video_flushing = TRUE;
+ /* pop_text will broadcast on the GCond and thus also make the video
+ * chain exit if it's waiting for a text buffer */
+ gst_base_text_overlay_pop_text (overlay);
+ GST_OBJECT_UNLOCK (overlay);
+ break;
+ default:
+ break;
+ }
+
+ ret = parent_class->change_state (element, transition);
+ if (ret == GST_STATE_CHANGE_FAILURE)
+ return ret;
+
+ switch (transition) {
+ case GST_STATE_CHANGE_READY_TO_PAUSED:
+ GST_OBJECT_LOCK (overlay);
+ overlay->text_flushing = FALSE;
+ overlay->video_flushing = FALSE;
+ overlay->video_eos = FALSE;
+ overlay->text_eos = FALSE;
+ gst_segment_init (&overlay->segment, GST_FORMAT_TIME);
+ gst_segment_init (&overlay->text_segment, GST_FORMAT_TIME);
+ GST_OBJECT_UNLOCK (overlay);
+ break;
+ default:
+ break;
+ }
+
+ return ret;
+}
+
+static gboolean
+plugin_init (GstPlugin * plugin)
+{
+ gst_controller_init (NULL, NULL);
+
+ if (!gst_element_register (plugin, "textoverlay", GST_RANK_NONE,
+ GST_TYPE_TEXT_OVERLAY) ||
+ !gst_element_register (plugin, "timeoverlay", GST_RANK_NONE,
+ GST_TYPE_TIME_OVERLAY) ||
+ !gst_element_register (plugin, "clockoverlay", GST_RANK_NONE,
+ GST_TYPE_CLOCK_OVERLAY) ||
+ !gst_element_register (plugin, "textrender", GST_RANK_NONE,
+ GST_TYPE_TEXT_RENDER)) {
+ return FALSE;
+ }
+
+ /*texttestsrc_plugin_init(module, plugin); */
+
+ GST_DEBUG_CATEGORY_INIT (pango_debug, "pango", 0, "Pango elements");
+
+ return TRUE;
+}
+
+GST_PLUGIN_DEFINE (GST_VERSION_MAJOR, GST_VERSION_MINOR,
+ "pango", "Pango-based text rendering and overlay", plugin_init,
+ VERSION, GST_LICENSE, GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)
projects / platform / upstream / gstreamer.git / commitdiff