+++ /dev/null
-/* GStreamer
- * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
- * Copyright (C) <2003> David Schleef <ds@schleef.org>
- *
- * 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.
- */
-
-#ifdef HAVE_CONFIG_H
-#include <config.h>
-#endif
-
-#include <gst/video/video.h>
-
-#include "gsttextoverlay.h"
-#include "gsttimeoverlay.h"
-#include "gstclockoverlay.h"
-#include "gsttextrender.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
-
-static GstElementDetails text_overlay_details = {
- "Text Overlay",
- "Filter/Editor/Video",
- "Adds text strings on top of a video buffer",
- "David Schleef <ds@schleef.org>"
-};
-
-enum
-{
- ARG_0,
- ARG_TEXT,
- ARG_SHADING,
- ARG_VALIGN,
- ARG_HALIGN,
- ARG_XPAD,
- ARG_YPAD,
- ARG_DELTAX,
- ARG_DELTAY,
- ARG_WRAP_MODE,
- ARG_FONT_DESC
-};
-
-
-static GstStaticPadTemplate src_template_factory =
-GST_STATIC_PAD_TEMPLATE ("src",
- GST_PAD_SRC,
- GST_PAD_ALWAYS,
- GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV ("I420"))
- );
-
-static GstStaticPadTemplate video_sink_template_factory =
-GST_STATIC_PAD_TEMPLATE ("video_sink",
- GST_PAD_SINK,
- GST_PAD_ALWAYS,
- GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV ("I420"))
- );
-
-static GstStaticPadTemplate text_sink_template_factory =
- GST_STATIC_PAD_TEMPLATE ("text_sink",
- GST_PAD_SINK,
- GST_PAD_ALWAYS,
- GST_STATIC_CAPS ("text/x-pango-markup; text/plain")
- );
-
-/* These macros are adapted from videotestsrc.c */
-#define I420_Y_ROWSTRIDE(width) (GST_ROUND_UP_4(width))
-#define I420_U_ROWSTRIDE(width) (GST_ROUND_UP_8(width)/2)
-#define I420_V_ROWSTRIDE(width) ((GST_ROUND_UP_8(I420_Y_ROWSTRIDE(width)))/2)
-
-#define I420_Y_OFFSET(w,h) (0)
-#define I420_U_OFFSET(w,h) (I420_Y_OFFSET(w,h)+(I420_Y_ROWSTRIDE(w)*GST_ROUND_UP_2(h)))
-#define I420_V_OFFSET(w,h) (I420_U_OFFSET(w,h)+(I420_U_ROWSTRIDE(w)*GST_ROUND_UP_2(h)/2))
-
-#define I420_SIZE(w,h) (I420_V_OFFSET(w,h)+(I420_V_ROWSTRIDE(w)*GST_ROUND_UP_2(h)/2))
-
-
-static GstStateChangeReturn gst_text_overlay_change_state (GstElement * element,
- GstStateChange transition);
-static GstCaps *gst_text_overlay_getcaps (GstPad * pad);
-static gboolean gst_text_overlay_setcaps (GstPad * pad, GstCaps * caps);
-static GstPadLinkReturn gst_text_overlay_text_pad_linked (GstPad * pad,
- GstPad * peer);
-static void gst_text_overlay_text_pad_unlinked (GstPad * pad);
-static GstFlowReturn gst_text_overlay_collected (GstCollectPads * pads,
- gpointer data);
-static void gst_text_overlay_finalize (GObject * object);
-static void gst_text_overlay_set_property (GObject * object, guint prop_id,
- const GValue * value, GParamSpec * pspec);
-
-
-GST_BOILERPLATE (GstTextOverlay, gst_text_overlay, GstElement, GST_TYPE_ELEMENT)
-#define DEFAULT_YPAD 25
-#define DEFAULT_XPAD 25
-#define DEFAULT_DELTAX 0
-#define DEFAULT_DELTAY 0
-/* keep wrap enum in sync with string in class_init */
-#define DEFAULT_WRAP_MODE GST_TEXT_OVERLAY_WRAP_MODE_WORD_CHAR
-#define DEFAULT_SHADING_VALUE -80
- static void gst_text_overlay_base_init (gpointer g_class)
-{
- GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
-
- gst_element_class_add_pad_template (element_class,
- gst_static_pad_template_get (&src_template_factory));
- gst_element_class_add_pad_template (element_class,
- gst_static_pad_template_get (&video_sink_template_factory));
-
- /* ugh */
- if (!GST_IS_TIME_OVERLAY_CLASS (g_class) &&
- !GST_IS_CLOCK_OVERLAY_CLASS (g_class)) {
- gst_element_class_add_pad_template (element_class,
- gst_static_pad_template_get (&text_sink_template_factory));
- }
-
- gst_element_class_set_details (element_class, &text_overlay_details);
-}
-
-static gchar *
-gst_text_overlay_get_text (GstTextOverlay * overlay, GstBuffer * video_frame)
-{
- return g_strdup (overlay->default_text);
-}
-
-static void
-gst_text_overlay_class_init (GstTextOverlayClass * klass)
-{
- GObjectClass *gobject_class;
- GstElementClass *gstelement_class;
-
- gobject_class = (GObjectClass *) klass;
- gstelement_class = (GstElementClass *) klass;
-
- gobject_class->finalize = gst_text_overlay_finalize;
- gobject_class->set_property = gst_text_overlay_set_property;
-
- gstelement_class->change_state =
- GST_DEBUG_FUNCPTR (gst_text_overlay_change_state);
-
- klass->get_text = gst_text_overlay_get_text;
- klass->pango_context = pango_ft2_get_context (72, 72);
-
- g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_TEXT,
- g_param_spec_string ("text", "text",
- "Text to be display.", "", G_PARAM_WRITABLE));
- g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_SHADING,
- g_param_spec_boolean ("shaded-background", "shaded background",
- "Whether to shade the background under the text area", FALSE,
- G_PARAM_WRITABLE));
- g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_VALIGN,
- g_param_spec_string ("valign", "vertical alignment",
- "Vertical alignment of the text. "
- "Can be either 'baseline', 'bottom', or 'top'",
- "baseline", G_PARAM_WRITABLE));
- g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_HALIGN,
- g_param_spec_string ("halign", "horizontal alignment",
- "Horizontal alignment of the text. "
- "Can be either 'left', 'right', or 'center'",
- "center", G_PARAM_WRITABLE));
- g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_XPAD,
- g_param_spec_int ("xpad", "horizontal paddding",
- "Horizontal paddding when using left/right alignment",
- 0, G_MAXINT, DEFAULT_XPAD, G_PARAM_WRITABLE));
- g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_YPAD,
- g_param_spec_int ("ypad", "vertical padding",
- "Vertical padding when using top/bottom alignment",
- 0, G_MAXINT, DEFAULT_YPAD, G_PARAM_WRITABLE));
- g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_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, 0, G_PARAM_WRITABLE));
- g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_DELTAY,
- g_param_spec_int ("deltay", "Y position modifier",
- "Shift Y position up or down. Unit is pixels.",
- G_MININT, G_MAXINT, 0, G_PARAM_WRITABLE));
- g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_WRAP_MODE,
- g_param_spec_string ("wrap-mode", "wrap mode",
- "Whether to wrap the text and if so how."
- "Can be either 'none', 'word', 'char' or 'wordchar'",
- "wordchar", G_PARAM_WRITABLE));
- g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_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.", "", G_PARAM_WRITABLE));
-}
-
-static void
-gst_text_overlay_finalize (GObject * object)
-{
- GstTextOverlay *overlay = GST_TEXT_OVERLAY (object);
-
- gst_collect_pads_stop (overlay->collect);
- gst_object_unref (overlay->collect);
-
- g_free (overlay->default_text);
- g_free (overlay->bitmap.buffer);
-
- if (overlay->layout)
- g_object_unref (overlay->layout);
-
- G_OBJECT_CLASS (parent_class)->finalize (object);
-}
-
-static void
-gst_text_overlay_init (GstTextOverlay * overlay, GstTextOverlayClass * klass)
-{
- /* video sink */
- overlay->video_sinkpad =
- gst_pad_new_from_template (gst_static_pad_template_get
- (&video_sink_template_factory), "video_sink");
- gst_pad_set_getcaps_function (overlay->video_sinkpad,
- GST_DEBUG_FUNCPTR (gst_text_overlay_getcaps));
- gst_pad_set_setcaps_function (overlay->video_sinkpad,
- GST_DEBUG_FUNCPTR (gst_text_overlay_setcaps));
- gst_element_add_pad (GST_ELEMENT (overlay), overlay->video_sinkpad);
-
- if (!GST_IS_TIME_OVERLAY_CLASS (klass) && !GST_IS_CLOCK_OVERLAY_CLASS (klass)) {
- /* text sink */
- overlay->text_sinkpad =
- gst_pad_new_from_template (gst_static_pad_template_get
- (&text_sink_template_factory), "text_sink");
- gst_pad_set_link_function (overlay->text_sinkpad,
- GST_DEBUG_FUNCPTR (gst_text_overlay_text_pad_linked));
- gst_pad_set_unlink_function (overlay->text_sinkpad,
- GST_DEBUG_FUNCPTR (gst_text_overlay_text_pad_unlinked));
- gst_element_add_pad (GST_ELEMENT (overlay), overlay->text_sinkpad);
- }
-
- /* (video) source */
- overlay->srcpad =
- gst_pad_new_from_template (gst_static_pad_template_get
- (&src_template_factory), "src");
- gst_pad_set_getcaps_function (overlay->srcpad,
- GST_DEBUG_FUNCPTR (gst_text_overlay_getcaps));
- gst_element_add_pad (GST_ELEMENT (overlay), overlay->srcpad);
-
- overlay->layout =
- pango_layout_new (GST_TEXT_OVERLAY_GET_CLASS (overlay)->pango_context);
- memset (&overlay->bitmap, 0, sizeof (overlay->bitmap));
-
- overlay->halign = GST_TEXT_OVERLAY_HALIGN_CENTER;
- overlay->valign = GST_TEXT_OVERLAY_VALIGN_BASELINE;
- overlay->xpad = DEFAULT_XPAD;
- overlay->ypad = DEFAULT_YPAD;
- overlay->deltax = 0;
- overlay->deltay = 0;
-
- overlay->wrap_mode = DEFAULT_WRAP_MODE;
-
- overlay->want_shading = FALSE;
- overlay->shading_value = DEFAULT_SHADING_VALUE;
-
- overlay->default_text = g_strdup ("");
- overlay->need_render = TRUE;
-
- overlay->fps_n = 0;
- overlay->fps_d = 1;
-
- overlay->collect = gst_collect_pads_new ();
-
- gst_collect_pads_set_function (overlay->collect,
- GST_DEBUG_FUNCPTR (gst_text_overlay_collected), overlay);
-
- overlay->video_collect_data = gst_collect_pads_add_pad (overlay->collect,
- overlay->video_sinkpad, sizeof (GstCollectData));
-
- /* text pad will be added when it is linked */
- overlay->text_collect_data = NULL;
-}
-
-static void
-gst_text_overlay_update_wrap_mode (GstTextOverlay * overlay)
-{
- if (overlay->wrap_mode == GST_TEXT_OVERLAY_WRAP_MODE_NONE) {
- GST_DEBUG_OBJECT (overlay, "Set wrap mode NONE");
- pango_layout_set_width (overlay->layout, -1);
- } else {
- 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, overlay->width * PANGO_SCALE);
- pango_layout_set_wrap (overlay->layout, (PangoWrapMode) overlay->wrap_mode);
- }
-}
-
-
-/* FIXME: upstream nego (e.g. when the video window is resized) */
-
-static gboolean
-gst_text_overlay_setcaps (GstPad * pad, GstCaps * caps)
-{
- GstTextOverlay *overlay;
- GstStructure *structure;
- gboolean ret = FALSE;
- const GValue *fps;
-
- if (!GST_PAD_IS_SINK (pad))
- return TRUE;
-
- g_return_val_if_fail (gst_caps_is_fixed (caps), FALSE);
-
- overlay = GST_TEXT_OVERLAY (gst_pad_get_parent (pad));
-
- overlay->width = 0;
- overlay->height = 0;
- structure = gst_caps_get_structure (caps, 0);
- fps = gst_structure_get_value (structure, "framerate");
-
- if (gst_structure_get_int (structure, "width", &overlay->width) &&
- gst_structure_get_int (structure, "height", &overlay->height) &&
- fps != NULL) {
- ret = gst_pad_set_caps (overlay->srcpad, caps);
- }
-
- overlay->fps_n = gst_value_get_fraction_numerator (fps);
- overlay->fps_d = gst_value_get_fraction_denominator (fps);
-
- if (ret) {
- GST_OBJECT_LOCK (overlay);
- gst_text_overlay_update_wrap_mode (overlay);
- GST_OBJECT_UNLOCK (overlay);
- }
-
- return ret;
-}
-
-static GstPadLinkReturn
-gst_text_overlay_text_pad_linked (GstPad * pad, GstPad * peer)
-{
- GstTextOverlay *overlay;
-
- overlay = GST_TEXT_OVERLAY (GST_PAD_PARENT (pad));
-
- GST_DEBUG_OBJECT (overlay, "Text pad linked");
-
- if (overlay->text_collect_data == NULL) {
- overlay->text_collect_data = gst_collect_pads_add_pad (overlay->collect,
- overlay->text_sinkpad, sizeof (GstCollectData));
- }
-
- overlay->need_render = TRUE;
-
- return GST_PAD_LINK_OK;
-}
-
-static void
-gst_text_overlay_text_pad_unlinked (GstPad * pad)
-{
- GstTextOverlay *overlay;
-
- /* don't use gst_pad_get_parent() here, will deadlock */
- overlay = GST_TEXT_OVERLAY (GST_PAD_PARENT (pad));
-
- GST_DEBUG_OBJECT (overlay, "Text pad unlinked");
-
- if (overlay->text_collect_data) {
- gst_collect_pads_remove_pad (overlay->collect, overlay->text_sinkpad);
- overlay->text_collect_data = NULL;
- }
-
- overlay->need_render = TRUE;
-}
-
-static void
-gst_text_overlay_set_property (GObject * object, guint prop_id,
- const GValue * value, GParamSpec * pspec)
-{
- GstTextOverlay *overlay = GST_TEXT_OVERLAY (object);
-
- GST_OBJECT_LOCK (overlay);
-
- switch (prop_id) {
- case ARG_TEXT:
- g_free (overlay->default_text);
- overlay->default_text = g_value_dup_string (value);
- overlay->need_render = TRUE;
- break;
-
- case ARG_SHADING:{
- overlay->want_shading = g_value_get_boolean (value);
- break;
- }
- case ARG_XPAD:{
- overlay->xpad = g_value_get_int (value);
- break;
- }
- case ARG_YPAD:{
- overlay->ypad = g_value_get_int (value);
- break;
- }
- case ARG_DELTAX:{
- overlay->deltax = g_value_get_int (value);
- break;
- }
- case ARG_DELTAY:{
- overlay->deltay = g_value_get_int (value);
- break;
- }
-
- case ARG_VALIGN:{
- const gchar *s = g_value_get_string (value);
-
- if (g_ascii_strcasecmp (s, "baseline") == 0)
- overlay->valign = GST_TEXT_OVERLAY_VALIGN_BASELINE;
- else if (g_ascii_strcasecmp (s, "bottom") == 0)
- overlay->valign = GST_TEXT_OVERLAY_VALIGN_BOTTOM;
- else if (g_ascii_strcasecmp (s, "top") == 0)
- overlay->valign = GST_TEXT_OVERLAY_VALIGN_TOP;
- else
- g_warning ("Invalid 'valign' property value: %s", s);
- break;
- }
-
- case ARG_HALIGN:{
- const gchar *s = g_value_get_string (value);
-
- if (g_ascii_strcasecmp (s, "left") == 0)
- overlay->halign = GST_TEXT_OVERLAY_HALIGN_LEFT;
- else if (g_ascii_strcasecmp (s, "right") == 0)
- overlay->halign = GST_TEXT_OVERLAY_HALIGN_RIGHT;
- else if (g_ascii_strcasecmp (s, "center") == 0)
- overlay->halign = GST_TEXT_OVERLAY_HALIGN_CENTER;
- else
- g_warning ("Invalid 'halign' property value: %s", s);
- break;
- }
-
- case ARG_WRAP_MODE:{
- const gchar *s = g_value_get_string (value);
-
- if (g_ascii_strcasecmp (s, "none") == 0)
- overlay->wrap_mode = GST_TEXT_OVERLAY_WRAP_MODE_NONE;
- else if (g_ascii_strcasecmp (s, "char") == 0)
- overlay->wrap_mode = GST_TEXT_OVERLAY_WRAP_MODE_CHAR;
- else if (g_ascii_strcasecmp (s, "word") == 0)
- overlay->wrap_mode = GST_TEXT_OVERLAY_WRAP_MODE_WORD;
- else if (g_ascii_strcasecmp (s, "wordchar") == 0)
- overlay->wrap_mode = GST_TEXT_OVERLAY_WRAP_MODE_WORD_CHAR;
- else
- g_warning ("Invalid 'wrap-mode' property value: %s", s);
-
- gst_text_overlay_update_wrap_mode (overlay);
- break;
- }
-
- case ARG_FONT_DESC:
- {
- PangoFontDescription *desc;
- const gchar *fontdesc_str;
-
- fontdesc_str = g_value_get_string (value);
- desc = pango_font_description_from_string (fontdesc_str);
- if (desc) {
- GST_LOG ("font description set: %s", fontdesc_str);
- pango_layout_set_font_description (overlay->layout, desc);
- pango_font_description_free (desc);
- } else {
- GST_WARNING ("font description parse failed: %s", fontdesc_str);
- }
- break;
- }
-
- default:
- G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
- break;
- }
-
- overlay->need_render = TRUE;
-
- GST_OBJECT_UNLOCK (overlay);
-}
-
-
-static GstCaps *
-gst_text_overlay_getcaps (GstPad * pad)
-{
- GstTextOverlay *overlay;
- GstPad *otherpad;
- GstCaps *caps;
-
- overlay = GST_TEXT_OVERLAY (gst_pad_get_parent (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);
- if (caps) {
- GstCaps *temp;
- const GstCaps *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 (caps, templ);
- GST_DEBUG_OBJECT (pad, "intersected %" GST_PTR_FORMAT, temp);
- gst_caps_unref (caps);
- /* this is what we can do */
- caps = temp;
- } else {
- /* no peer, our padtemplate is enough then */
- caps = gst_caps_copy (gst_pad_get_pad_template_caps (pad));
- }
-
- GST_DEBUG_OBJECT (overlay, "returning %" GST_PTR_FORMAT, caps);
-
- gst_object_unref (overlay);
-
- return caps;
-}
-
-#define BOX_XPAD 6
-#define BOX_YPAD 6
-
-static inline void
-gst_text_overlay_shade_y (GstTextOverlay * overlay, guchar * dest,
- guint dest_stride, gint x0, gint x1, gint y0, gint y1)
-{
- gint i, j;
-
- 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[(i * dest_stride) + j] + overlay->shading_value;
-
- dest[(i * dest_stride) + j] = CLAMP (y, 0, 255);
- }
- }
-}
-
-/* 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_text_overlay_blit_yuv420 (GstTextOverlay * overlay, FT_Bitmap * bitmap,
- guint8 * yuv_pixels, gint x0, gint y0)
-{
- int y; /* text bitmap coordinates */
- int x1, y1; /* video buffer coordinates */
- int bit_rowinc, uv_rowinc;
- guint8 *p, *bitp, *u_p;
- int video_width, video_height;
- int bitmap_x0 = 0; //x0 < 1 ? -(x0 - 1) : 1; /* 1 pixel border */
- int bitmap_y0 = y0 < 1 ? -(y0 - 1) : 1; /* 1 pixel border */
- int bitmap_width = bitmap->width - bitmap_x0;
- int bitmap_height = bitmap->rows - bitmap_y0;
- int u_plane_size;
- int skip_y, skip_x;
- guint8 v;
-
- video_width = I420_Y_ROWSTRIDE (overlay->width);
- video_height = overlay->height;
-
-/*
- if (x0 < 0 && abs (x0) < bitmap_width) {
- bitmap_x0 = abs (x0);
- x0 = 0;
- }
-*/
-
- if (x0 + bitmap_x0 + bitmap_width > overlay->width - 1) /* 1 pixel border */
- bitmap_width -= x0 + bitmap_x0 + bitmap_width - overlay->width + 1;
- if (y0 + bitmap_y0 + bitmap_height > video_height - 1) /* 1 pixel border */
- bitmap_height -= y0 + bitmap_y0 + bitmap_height - video_height + 1;
-
- uv_rowinc = video_width / 2 - bitmap_width / 2;
- bit_rowinc = bitmap->pitch - bitmap_width;
- u_plane_size = (video_width / 2) * (video_height / 2);
-
- y1 = y0 + bitmap_y0;
- x1 = x0 + bitmap_x0;
- bitp = bitmap->buffer + bitmap->pitch * bitmap_y0 + bitmap_x0;
- for (y = bitmap_y0; y < bitmap_y0 + bitmap_height; y++) {
- int n;
-
- p = yuv_pixels + (y + y0) * I420_Y_ROWSTRIDE (overlay->width) + x1;
- for (n = bitmap_width; n > 0; --n) {
- v = *bitp;
- if (v) {
- p[-1] = CLAMP (p[-1] - v, 0, 255);
- p[1] = CLAMP (p[1] - v, 0, 255);
- p[-video_width] = CLAMP (p[-video_width] - v, 0, 255);
- p[video_width] = CLAMP (p[video_width] - v, 0, 255);
- }
- p++;
- bitp++;
- }
- bitp += bit_rowinc;
- }
-
- y = bitmap_y0;
- y1 = y0 + bitmap_y0;
- x1 = x0 + bitmap_x0;
- bitp = bitmap->buffer + bitmap->pitch * bitmap_y0 + bitmap_x0;
- p = yuv_pixels + video_width * y1 + x1;
- u_p =
- yuv_pixels + video_width * video_height + (video_width >> 1) * (y1 >> 1) +
- (x1 >> 1);
- skip_y = 0;
- skip_x = 0;
-
- for (; y < bitmap_y0 + bitmap_height; y++) {
- int n;
-
- x1 = x0 + bitmap_x0;
- skip_x = 0;
- for (n = bitmap_width; n > 0; --n) {
- v = *bitp;
- if (v) {
- *p = v;
- if (!skip_y) {
- u_p[0] = u_p[u_plane_size] = 0x80;
- }
- }
- if (!skip_y) {
- skip_x = !skip_x;
- if (!skip_x)
- u_p++;
- }
- p++;
- bitp++;
- }
- /*if (!skip_x && !skip_y) u_p--; */
- p += I420_Y_ROWSTRIDE (overlay->width) - bitmap_width;
- bitp += bit_rowinc;
- skip_y = !skip_y;
- u_p += skip_y ? uv_rowinc : 0;
- }
-}
-
-static void
-gst_text_overlay_resize_bitmap (GstTextOverlay * overlay, gint width,
- gint height)
-{
- FT_Bitmap *bitmap = &overlay->bitmap;
- int pitch = (width | 3) + 1;
- int size = pitch * height;
-
- /* no need to keep reallocating; just keep the maximum size so far */
- if (size <= overlay->bitmap_buffer_size) {
- bitmap->rows = height;
- bitmap->width = width;
- bitmap->pitch = pitch;
- memset (bitmap->buffer, 0, overlay->bitmap_buffer_size);
- return;
- }
- if (!bitmap->buffer) {
- /* initialize */
- bitmap->pixel_mode = ft_pixel_mode_grays;
- bitmap->num_grays = 256;
- }
- overlay->bitmap_buffer_size = size;
- bitmap->buffer = g_realloc (bitmap->buffer, size);
- memset (bitmap->buffer, 0, size);
- bitmap->rows = height;
- bitmap->width = width;
- bitmap->pitch = pitch;
-}
-
-static void
-gst_text_overlay_render_text (GstTextOverlay * overlay,
- const gchar * text, gint textlen)
-{
- PangoRectangle ink_rect, logical_rect;
- gchar *string;
-
- if (textlen < 0)
- textlen = strlen (text);
-
- string = g_strndup (text, textlen);
- g_strdelimit (string, "\n\r\t", ' ');
- textlen = strlen (string);
-
- /* FIXME: should we check for UTF-8 here? */
-
- if (!overlay->need_render) {
- GST_DEBUG ("Using previously rendered text.");
- return;
- }
-
- GST_DEBUG ("Rendering '%s'", string);
- pango_layout_set_markup (overlay->layout, string, textlen);
-
- pango_layout_get_pixel_extents (overlay->layout, &ink_rect, &logical_rect);
- gst_text_overlay_resize_bitmap (overlay, ink_rect.width,
- ink_rect.height + ink_rect.y);
- pango_ft2_render_layout (&overlay->bitmap, overlay->layout, -ink_rect.x, 0);
- overlay->baseline_y = ink_rect.y;
-
- g_free (string);
-
- overlay->need_render = FALSE;
-}
-
-static GstFlowReturn
-gst_text_overlay_push_frame (GstTextOverlay * overlay, GstBuffer * video_frame)
-{
- gint xpos, ypos;
-
- video_frame = gst_buffer_make_writable (video_frame);
-
- switch (overlay->halign) {
- case GST_TEXT_OVERLAY_HALIGN_LEFT:
- xpos = overlay->xpad;
- break;
- case GST_TEXT_OVERLAY_HALIGN_CENTER:
- xpos = (overlay->width - overlay->bitmap.width) / 2;
- break;
- case GST_TEXT_OVERLAY_HALIGN_RIGHT:
- xpos = overlay->width - overlay->bitmap.width - overlay->xpad;
- break;
- default:
- xpos = 0;
- }
- xpos += overlay->deltax;
-
-
- switch (overlay->valign) {
- case GST_TEXT_OVERLAY_VALIGN_BOTTOM:
- ypos = overlay->height - overlay->bitmap.rows - overlay->ypad;
- break;
- case GST_TEXT_OVERLAY_VALIGN_BASELINE:
- ypos = overlay->height - (overlay->bitmap.rows + overlay->ypad);
- break;
- case GST_TEXT_OVERLAY_VALIGN_TOP:
- ypos = overlay->ypad;
- break;
- default:
- ypos = overlay->ypad;
- break;
- }
- ypos += overlay->deltay;
-
- /* shaded background box */
- if (overlay->want_shading) {
- gst_text_overlay_shade_y (overlay,
- GST_BUFFER_DATA (video_frame),
- I420_Y_ROWSTRIDE (overlay->width),
- xpos, xpos + overlay->bitmap.width, ypos, ypos + overlay->bitmap.rows);
- }
-
-
- if (overlay->bitmap.buffer) {
- gst_text_overlay_blit_yuv420 (overlay, &overlay->bitmap,
- GST_BUFFER_DATA (video_frame), xpos, ypos);
- }
-
- return gst_pad_push (overlay->srcpad, video_frame);
-}
-
-static void
-gst_text_overlay_pop_video (GstTextOverlay * overlay)
-{
- GstBuffer *buf;
-
- buf = gst_collect_pads_pop (overlay->collect, overlay->video_collect_data);
- g_return_if_fail (buf != NULL);
- gst_buffer_unref (buf);
-}
-
-static void
-gst_text_overlay_pop_text (GstTextOverlay * overlay)
-{
- GstBuffer *buf;
-
- if (overlay->text_collect_data) {
- buf = gst_collect_pads_pop (overlay->collect, overlay->text_collect_data);
- g_return_if_fail (buf != NULL);
- gst_buffer_unref (buf);
- }
-
- overlay->need_render = TRUE;
-}
-
-/* This function is called when there is data on all pads */
-static GstFlowReturn
-gst_text_overlay_collected (GstCollectPads * pads, gpointer data)
-{
- GstTextOverlayClass *klass;
- GstTextOverlay *overlay;
- GstFlowReturn ret = GST_FLOW_OK;
- GstClockTime now, txt_end, frame_end;
- GstBuffer *video_frame = NULL;
- GstBuffer *text_buf = NULL;
- gchar *text;
- gint text_len;
-
- overlay = GST_TEXT_OVERLAY (data);
- klass = GST_TEXT_OVERLAY_GET_CLASS (data);
-
- GST_DEBUG ("Collecting");
-
- video_frame = gst_collect_pads_peek (overlay->collect,
- overlay->video_collect_data);
-
- /* send EOS if video stream EOSed regardless of text stream */
- if (video_frame == NULL) {
- GST_DEBUG ("Video stream at EOS");
- if (overlay->text_collect_data) {
- text_buf = gst_collect_pads_pop (overlay->collect,
- overlay->text_collect_data);
- }
- gst_pad_push_event (overlay->srcpad, gst_event_new_eos ());
- ret = GST_FLOW_UNEXPECTED;
- goto done;
- }
-
- if (GST_BUFFER_TIMESTAMP (video_frame) == GST_CLOCK_TIME_NONE) {
- g_warning ("%s: video frame has invalid timestamp", G_STRLOC);
- }
-
- now = GST_BUFFER_TIMESTAMP (video_frame);
-
- if (GST_BUFFER_DURATION (video_frame) != GST_CLOCK_TIME_NONE) {
- frame_end = now + GST_BUFFER_DURATION (video_frame);
- } else if (overlay->fps_n > 0) {
- frame_end = now + gst_util_uint64_scale_int (GST_SECOND,
- overlay->fps_d, overlay->fps_n);
- } else {
- /* magic value, does not really matter since texts
- * tend to span quite a few frames in practice anyway */
- frame_end = now + GST_SECOND / 25;
- }
-
- GST_DEBUG ("Got video frame: %" GST_TIME_FORMAT " - %" GST_TIME_FORMAT,
- GST_TIME_ARGS (now), GST_TIME_ARGS (frame_end));
-
- /* text pad not linked? */
- if (overlay->text_collect_data == NULL) {
- gchar *txt;
-
- if (klass->get_text)
- txt = klass->get_text (overlay, video_frame);
- else
- txt = g_strdup (overlay->default_text);
-
- GST_DEBUG ("Text pad not linked, rendering default text: '%s'",
- GST_STR_NULL (txt));
- if (txt != NULL && *txt != '\0') {
- gst_text_overlay_render_text (overlay, txt, -1);
- ret = gst_text_overlay_push_frame (overlay, video_frame);
- } else {
- ret = gst_pad_push (overlay->srcpad, video_frame);
- }
- gst_text_overlay_pop_video (overlay);
- video_frame = NULL;
- goto done;
- }
-
- text_buf = gst_collect_pads_peek (overlay->collect,
- overlay->text_collect_data);
-
- /* just push the video frame if the text stream has EOSed */
- if (text_buf == NULL) {
- GST_DEBUG ("Text pad EOSed, just pushing video frame as is");
- ret = gst_pad_push (overlay->srcpad, video_frame);
- gst_text_overlay_pop_video (overlay);
- video_frame = NULL;
- goto done;
- }
-
- /* 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 (text_buf) == GST_CLOCK_TIME_NONE ||
- GST_BUFFER_DURATION (text_buf) == GST_CLOCK_TIME_NONE) {
- GST_WARNING ("Got text buffer with invalid time stamp or duration");
- gst_text_overlay_pop_text (overlay);
- GST_BUFFER_TIMESTAMP (text_buf) = now;
- GST_BUFFER_DURATION (text_buf) = frame_end - now;
- }
-
- txt_end = GST_BUFFER_TIMESTAMP (text_buf) + GST_BUFFER_DURATION (text_buf);
-
- GST_DEBUG ("Got text buffer: %" GST_TIME_FORMAT " - %" GST_TIME_FORMAT,
- GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (text_buf)), GST_TIME_ARGS (txt_end));
-
- /* if the text buffer is too old, pop it off the
- * queue and return so we get a new one next time */
- if (txt_end < now) {
- GST_DEBUG ("Text buffer too old, popping off the queue");
- gst_text_overlay_pop_text (overlay);
- ret = GST_FLOW_OK;
- goto done;
- }
-
- /* if the video frame ends before the text even starts,
- * just push it out as is and pop it off the queue */
- if (frame_end < GST_BUFFER_TIMESTAMP (text_buf)) {
- GST_DEBUG ("Video buffer before text, pushing out and popping off queue");
- ret = gst_pad_push (overlay->srcpad, video_frame);
- gst_text_overlay_pop_video (overlay);
- video_frame = NULL;
- goto done;
- }
-
- /* text duration overlaps video frame duration */
- text = g_strndup ((gchar *) GST_BUFFER_DATA (text_buf),
- GST_BUFFER_SIZE (text_buf));
- g_strdelimit (text, "\n\r\t", ' ');
- text_len = strlen (text);
-
- if (text_len > 0) {
- GST_DEBUG ("Rendering text '%*s'", text_len, text);;
- gst_text_overlay_render_text (overlay, text, text_len);
- } else {
- GST_DEBUG ("No text to render (empty buffer)");
- gst_text_overlay_render_text (overlay, " ", 1);
- }
-
- g_free (text);
-
- gst_text_overlay_pop_video (overlay);
- ret = gst_text_overlay_push_frame (overlay, video_frame);
- video_frame = NULL;
- goto done;
-
-done:
- {
- if (text_buf)
- gst_buffer_unref (text_buf);
-
- if (video_frame)
- gst_buffer_unref (video_frame);
-
- return ret;
- }
-}
-
-static GstStateChangeReturn
-gst_text_overlay_change_state (GstElement * element, GstStateChange transition)
-{
- GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
- GstTextOverlay *overlay = GST_TEXT_OVERLAY (element);
-
- switch (transition) {
- case GST_STATE_CHANGE_READY_TO_PAUSED:
- gst_collect_pads_start (overlay->collect);
- break;
- case GST_STATE_CHANGE_PAUSED_TO_READY:
- /* need to unblock the collectpads before calling the
- * parent change_state so that streaming can finish */
- gst_collect_pads_stop (overlay->collect);
- break;
- default:
- break;
- }
-
- ret = parent_class->change_state (element, transition);
- if (ret == GST_STATE_CHANGE_FAILURE)
- return ret;
-
- switch (transition) {
- default:
- break;
- }
-
- return ret;
-}
-
-static gboolean
-plugin_init (GstPlugin * plugin)
-{
- 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)
+++ /dev/null
-/* GStreamer
- * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
- * Copyright (C) <2003> David Schleef <ds@schleef.org>
- *
- * 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.
- */
-
-#ifdef HAVE_CONFIG_H
-#include <config.h>
-#endif
-
-#include <gst/gst.h>
-#include <gst/video/video.h>
-
-#include "gsttextrender.h"
-
-GST_DEBUG_CATEGORY_EXTERN (pango_debug);
-#define GST_CAT_DEFAULT pango_debug
-
-static GstElementDetails text_render_details = {
- "Text Render",
- "Filter/Editor/Video",
- "Renders a text string to an image bitmap",
- "David Schleef <ds@schleef.org>, "
- "Ronald S. Bultje <rbultje@ronald.bitfreak.net>"
-};
-
-enum
-{
- ARG_0,
- ARG_FONT_DESC
-};
-
-
-static GstStaticPadTemplate src_template_factory =
-GST_STATIC_PAD_TEMPLATE ("src",
- GST_PAD_SRC,
- GST_PAD_ALWAYS,
- GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV ("AYUV"))
- );
-
-static GstStaticPadTemplate sink_template_factory =
- GST_STATIC_PAD_TEMPLATE ("sink",
- GST_PAD_SINK,
- GST_PAD_ALWAYS,
- GST_STATIC_CAPS ("text/x-pango-markup; text/plain")
- );
-
-GST_BOILERPLATE (GstTextRender, gst_text_render, GstElement, GST_TYPE_ELEMENT)
-
- static void gst_text_render_finalize (GObject * object);
- static void gst_text_render_set_property (GObject * object,
- guint prop_id, const GValue * value, GParamSpec * pspec);
-
- static void gst_text_render_base_init (gpointer g_class)
-{
- GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
-
- gst_element_class_add_pad_template (element_class,
- gst_static_pad_template_get (&src_template_factory));
- gst_element_class_add_pad_template (element_class,
- gst_static_pad_template_get (&sink_template_factory));
-
- gst_element_class_set_details (element_class, &text_render_details);
-}
-
-static void
-gst_text_render_class_init (GstTextRenderClass * 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_text_render_finalize;
- gobject_class->set_property = gst_text_render_set_property;
-
- klass->pango_context = pango_ft2_get_context (72, 72);
- g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_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.", "", G_PARAM_WRITABLE));
-}
-
-
-static void
-resize_bitmap (GstTextRender * render, gint width, gint height)
-{
- FT_Bitmap *bitmap = &render->bitmap;
- gint pitch = (width | 3) + 1;
- gint size = pitch * height;
-
- /* no need to keep reallocating; just keep the maximum size so far */
- if (size <= render->bitmap_buffer_size) {
- bitmap->rows = height;
- bitmap->width = width;
- bitmap->pitch = pitch;
- memset (bitmap->buffer, 0, render->bitmap_buffer_size);
- return;
- }
- if (!bitmap->buffer) {
- /* initialize */
- bitmap->pixel_mode = ft_pixel_mode_grays;
- bitmap->num_grays = 256;
- }
- if (bitmap->buffer)
- bitmap->buffer = g_realloc (bitmap->buffer, size);
- else
- bitmap->buffer = g_malloc (size);
- bitmap->rows = height;
- bitmap->width = width;
- bitmap->pitch = pitch;
- memset (bitmap->buffer, 0, size);
- render->bitmap_buffer_size = size;
-}
-
-static void
-gst_text_render_render_text (GstTextRender * render)
-{
- PangoRectangle ink_rect, logical_rect;
-
- pango_layout_get_pixel_extents (render->layout, &ink_rect, &logical_rect);
- resize_bitmap (render, ink_rect.width, ink_rect.height + ink_rect.y);
- pango_ft2_render_layout (&render->bitmap, render->layout, -ink_rect.x, 0);
- render->baseline_y = ink_rect.y;
-}
-
-static gboolean
-gst_text_render_setcaps (GstPad * pad, GstCaps * caps)
-{
- GstTextRender *render = GST_TEXT_RENDER (gst_pad_get_parent (pad));
- GstStructure *structure;
- gboolean ret = FALSE;
- gint width = 0, height = 0;
-
- structure = gst_caps_get_structure (caps, 0);
- gst_structure_get_int (structure, "width", &width);
- gst_structure_get_int (structure, "height", &height);
-
- GST_DEBUG ("Got caps %" GST_PTR_FORMAT, caps);
-
- if (width >= render->bitmap.width && height >= render->bitmap.rows) {
- render->width = width;
- render->height = height;
- ret = TRUE;
- }
-
- gst_object_unref (render);
- return ret;
-}
-
-static void
-gst_text_render_fixate_caps (GstPad * pad, GstCaps * caps)
-{
- GstTextRender *render = GST_TEXT_RENDER (gst_pad_get_parent (pad));
- GstStructure *s = gst_caps_get_structure (caps, 0);
-
- GST_DEBUG ("Fixating caps %" GST_PTR_FORMAT, caps);
- gst_structure_fixate_field_nearest_int (s, "width", render->bitmap.width);
- gst_structure_fixate_field_nearest_int (s, "height", render->bitmap.rows);
- GST_DEBUG ("Fixated to %" GST_PTR_FORMAT, caps);
-
- gst_object_unref (render);
-}
-
-static void
-gst_text_renderer_bitmap_to_ayuv (GstTextRender * render, FT_Bitmap * bitmap,
- guchar * pixbuf)
-{
- int y; /* text bitmap coordinates */
- int rowinc, bit_rowinc;
- guchar *p, *bitp;
- guchar v;
-
- rowinc = render->width - bitmap->width;
- bit_rowinc = bitmap->pitch - bitmap->width;
-
- bitp = bitmap->buffer;
- p = pixbuf;
-
- for (y = 0; y < bitmap->rows; y++) {
- int n;
-
- for (n = bitmap->width; n > 0; --n) {
- v = *bitp;
- if (v) {
- p[0] = v;
- p[1] = 255;
- p[2] = 0x80;
- p[3] = 0x80;
- }
- p += 4;
- bitp++;
- }
- p += rowinc * 4;
- bitp += bit_rowinc;
- }
-}
-
-
-static GstFlowReturn
-gst_text_render_chain (GstPad * pad, GstBuffer * inbuf)
-{
- GstTextRender *render;
- GstFlowReturn ret;
- GstBuffer *outbuf;
- GstCaps *caps = NULL;
- guint8 *data = GST_BUFFER_DATA (inbuf);
- guint size = GST_BUFFER_SIZE (inbuf);
- gint n;
-
- render = GST_TEXT_RENDER (gst_pad_get_parent (pad));
-
- /* somehow pango barfs over "\0" buffers... */
- while (size > 0 &&
- (data[size - 1] == '\r' ||
- data[size - 1] == '\n' || data[size - 1] == '\0')) {
- size--;
- }
-
- /* render text */
- GST_DEBUG ("rendering '%*s'", size, data);
- pango_layout_set_markup (render->layout, (gchar *) data, size);
- gst_text_render_render_text (render);
-
- caps = gst_caps_new_simple ("video/x-raw-yuv", "format", GST_TYPE_FOURCC,
- GST_MAKE_FOURCC ('A', 'Y', 'U', 'V'), "width", G_TYPE_INT,
- render->bitmap.width, "height", G_TYPE_INT, render->bitmap.rows,
- "framerate", GST_TYPE_FRACTION, 1, 1, NULL);
-
- if (!gst_pad_set_caps (render->srcpad, caps)) {
- gst_caps_unref (caps);
- GST_ELEMENT_ERROR (render, CORE, NEGOTIATION, (NULL), (NULL));
- ret = GST_FLOW_ERROR;
- goto done;
- }
-
- GST_DEBUG ("Allocating AYUV buffer WxH = %dx%d", render->width,
- render->height);
- ret =
- gst_pad_alloc_buffer (render->srcpad, GST_BUFFER_OFFSET_NONE,
- render->width * render->height * 4, caps, &outbuf);
-
- if (ret != GST_FLOW_OK)
- goto done;
-
- gst_buffer_stamp (outbuf, inbuf);
- data = GST_BUFFER_DATA (outbuf);
-
- for (n = 0; n < render->width * render->height; n++) {
- data[n * 4] = 0;
- data[n * 4 + 1] = 0;
- data[n * 4 + 2] = data[n * 4 + 3] = 128;
- }
-
- if (render->bitmap.buffer) {
- gst_text_renderer_bitmap_to_ayuv (render, &render->bitmap, data);
- }
-
- ret = gst_pad_push (render->srcpad, outbuf);
-
-done:
- if (caps)
- gst_caps_unref (caps);
- gst_buffer_unref (inbuf);
- gst_object_unref (render);
- return ret;
-}
-
-static void
-gst_text_render_finalize (GObject * object)
-{
- GstTextRender *render = GST_TEXT_RENDER (object);
-
- g_free (render->bitmap.buffer);
-
- if (render->layout)
- g_object_unref (render->layout);
-
- G_OBJECT_CLASS (parent_class)->finalize (object);
-}
-
-static void
-gst_text_render_init (GstTextRender * render, GstTextRenderClass * klass)
-{
- /* sink */
- render->sinkpad =
- gst_pad_new_from_template (gst_static_pad_template_get
- (&sink_template_factory), "sink");
- gst_pad_set_chain_function (render->sinkpad,
- GST_DEBUG_FUNCPTR (gst_text_render_chain));
- gst_element_add_pad (GST_ELEMENT (render), render->sinkpad);
-
- /* source */
- render->srcpad =
- gst_pad_new_from_template (gst_static_pad_template_get
- (&src_template_factory), "src");
- gst_pad_set_fixatecaps_function (render->srcpad,
- GST_DEBUG_FUNCPTR (gst_text_render_fixate_caps));
- gst_pad_set_setcaps_function (render->srcpad,
- GST_DEBUG_FUNCPTR (gst_text_render_setcaps));
- gst_element_add_pad (GST_ELEMENT (render), render->srcpad);
-
- render->layout =
- pango_layout_new (GST_TEXT_RENDER_GET_CLASS (render)->pango_context);
- memset (&render->bitmap, 0, sizeof (render->bitmap));
-}
-
-static void
-gst_text_render_set_property (GObject * object, guint prop_id,
- const GValue * value, GParamSpec * pspec)
-{
- GstTextRender *render = GST_TEXT_RENDER (object);
-
- switch (prop_id) {
- case ARG_FONT_DESC:
- {
- PangoFontDescription *desc;
-
- desc = pango_font_description_from_string (g_value_get_string (value));
- if (desc) {
- GST_LOG ("font description set: %s", g_value_get_string (value));
- GST_OBJECT_LOCK (render);
- pango_layout_set_font_description (render->layout, desc);
- pango_font_description_free (desc);
- gst_text_render_render_text (render);
- GST_OBJECT_UNLOCK (render);
- } else {
- GST_WARNING ("font description parse failed: %s",
- g_value_get_string (value));
- }
- break;
- }
-
- default:
- break;
- }
-}
projects / platform / upstream / gst-plugins-good.git / commitdiff