2 * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
3 * Copyright (C) <2003> David Schleef <ds@schleef.org>
4 * Copyright (C) <2006> Julien Moutte <julien@moutte.net>
5 * Copyright (C) <2006> Zeeshan Ali <zeeshan.ali@nokia.com>
6 * Copyright (C) <2006-2008> Tim-Philipp Müller <tim centricular net>
7 * Copyright (C) <2009> Young-Ho Cha <ganadist@gmail.com>
9 * This library is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Library General Public
11 * License as published by the Free Software Foundation; either
12 * version 2 of the License, or (at your option) any later version.
14 * This library is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Library General Public License for more details.
19 * You should have received a copy of the GNU Library General Public
20 * License along with this library; if not, write to the
21 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
22 * Boston, MA 02111-1307, USA.
26 * SECTION:element-textoverlay
27 * @see_also: #GstTextRender, #GstClockOverlay, #GstTimeOverlay, #GstSubParse
29 * This plugin renders text on top of a video stream. This can be either
30 * static text or text from buffers received on the text sink pad, e.g.
31 * as produced by the subparse element. If the text sink pad is not linked,
32 * the text set via the "text" property will be rendered. If the text sink
33 * pad is linked, text will be rendered as it is received on that pad,
34 * honouring and matching the buffer timestamps of both input streams.
36 * The text can contain newline characters and text wrapping is enabled by
40 * <title>Example launch lines</title>
42 * gst-launch -v videotestsrc ! textoverlay text="Room A" valign=top halign=left ! xvimagesink
43 * ]| Here is a simple pipeline that displays a static text in the top left
44 * corner of the video picture
46 * gst-launch -v filesrc location=subtitles.srt ! subparse ! txt. videotestsrc ! timeoverlay ! textoverlay name=txt shaded-background=yes ! xvimagesink
47 * ]| Here is another pipeline that displays subtitles from an .srt subtitle
48 * file, centered at the bottom of the picture and with a rectangular shading
49 * around the text in the background:
51 * If you do not have such a subtitle file, create one looking like this
55 * 00:00:03,000 --> 00:00:05,000
59 * 00:00:08,000 --> 00:00:13,000
60 * Yes, this is a subtitle. Don't
61 * you like it? (8-13s)
64 * 00:00:18,826 --> 00:01:02,886
65 * Uh? What are you talking about?
66 * I don't understand (18-62s)
72 /* FIXME: alloc segment as part of instance struct */
78 #include <gst/video/video.h>
80 #include "gstbasetextoverlay.h"
81 #include "gsttextoverlay.h"
82 #include "gsttimeoverlay.h"
83 #include "gstclockoverlay.h"
84 #include "gsttextrender.h"
88 * - use proper strides and offset for I420
89 * - if text is wider than the video picture, it does not get
90 * clipped properly during blitting (if wrapping is disabled)
91 * - make 'shading_value' a property (or enum: light/normal/dark/verydark)?
94 GST_DEBUG_CATEGORY (pango_debug);
95 #define GST_CAT_DEFAULT pango_debug
97 #define DEFAULT_PROP_TEXT ""
98 #define DEFAULT_PROP_SHADING FALSE
99 #define DEFAULT_PROP_VALIGNMENT GST_BASE_TEXT_OVERLAY_VALIGN_BASELINE
100 #define DEFAULT_PROP_HALIGNMENT GST_BASE_TEXT_OVERLAY_HALIGN_CENTER
101 #define DEFAULT_PROP_VALIGN "baseline"
102 #define DEFAULT_PROP_HALIGN "center"
103 #define DEFAULT_PROP_XPAD 25
104 #define DEFAULT_PROP_YPAD 25
105 #define DEFAULT_PROP_DELTAX 0
106 #define DEFAULT_PROP_DELTAY 0
107 #define DEFAULT_PROP_XPOS 0.5
108 #define DEFAULT_PROP_YPOS 0.5
109 #define DEFAULT_PROP_WRAP_MODE GST_BASE_TEXT_OVERLAY_WRAP_MODE_WORD_CHAR
110 #define DEFAULT_PROP_FONT_DESC ""
111 #define DEFAULT_PROP_SILENT FALSE
112 #define DEFAULT_PROP_LINE_ALIGNMENT GST_BASE_TEXT_OVERLAY_LINE_ALIGN_CENTER
113 #define DEFAULT_PROP_WAIT_TEXT TRUE
114 #define DEFAULT_PROP_AUTO_ADJUST_SIZE TRUE
115 #define DEFAULT_PROP_VERTICAL_RENDER FALSE
116 #define DEFAULT_PROP_COLOR 0xffffffff
117 #define DEFAULT_PROP_OUTLINE_COLOR 0xff000000
119 /* make a property of me */
120 #define DEFAULT_SHADING_VALUE -80
122 #define MINIMUM_OUTLINE_OFFSET 1.0
123 #define DEFAULT_SCALE_BASIS 640
125 #define COMP_Y(ret, r, g, b) \
127 ret = (int) (((19595 * r) >> 16) + ((38470 * g) >> 16) + ((7471 * b) >> 16)); \
128 ret = CLAMP (ret, 0, 255); \
131 #define COMP_U(ret, r, g, b) \
133 ret = (int) (-((11059 * r) >> 16) - ((21709 * g) >> 16) + ((32768 * b) >> 16) + 128); \
134 ret = CLAMP (ret, 0, 255); \
137 #define COMP_V(ret, r, g, b) \
139 ret = (int) (((32768 * r) >> 16) - ((27439 * g) >> 16) - ((5329 * b) >> 16) + 128); \
140 ret = CLAMP (ret, 0, 255); \
143 #define BLEND(ret, alpha, v0, v1) \
145 ret = (v0 * alpha + v1 * (255 - alpha)) / 255; \
148 #define OVER(ret, alphaA, Ca, alphaB, Cb, alphaNew) \
151 _tmp = (Ca * alphaA + Cb * alphaB * (255 - alphaA) / 255) / alphaNew; \
152 ret = CLAMP (_tmp, 0, 255); \
155 #if G_BYTE_ORDER == G_LITTLE_ENDIAN
156 # define CAIRO_ARGB_A 3
157 # define CAIRO_ARGB_R 2
158 # define CAIRO_ARGB_G 1
159 # define CAIRO_ARGB_B 0
161 # define CAIRO_ARGB_A 0
162 # define CAIRO_ARGB_R 1
163 # define CAIRO_ARGB_G 2
164 # define CAIRO_ARGB_B 3
172 PROP_VALIGN, /* deprecated */
173 PROP_HALIGN, /* deprecated */
187 PROP_AUTO_ADJUST_SIZE,
188 PROP_VERTICAL_RENDER,
195 #define VIDEO_FORMATS "{ BGRx, RGBx, xRGB, xBGR, RGBA, BGRA, ARGB, ABGR, RGB, BGR, \
196 I420, YV12, AYUV, YUY2, UYVY, v308, v210, v216, Y41B, Y42B, Y444, \
197 Y800, Y16, NV12, NV21, UYVP, A420, YUV9, IYU1 }"
199 static GstStaticPadTemplate src_template_factory =
200 GST_STATIC_PAD_TEMPLATE ("src",
203 GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE (VIDEO_FORMATS))
206 static GstStaticPadTemplate video_sink_template_factory =
207 GST_STATIC_PAD_TEMPLATE ("video_sink",
210 GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE (VIDEO_FORMATS))
213 #define GST_TYPE_BASE_TEXT_OVERLAY_VALIGN (gst_base_text_overlay_valign_get_type())
215 gst_base_text_overlay_valign_get_type (void)
217 static GType base_text_overlay_valign_type = 0;
218 static const GEnumValue base_text_overlay_valign[] = {
219 {GST_BASE_TEXT_OVERLAY_VALIGN_BASELINE, "baseline", "baseline"},
220 {GST_BASE_TEXT_OVERLAY_VALIGN_BOTTOM, "bottom", "bottom"},
221 {GST_BASE_TEXT_OVERLAY_VALIGN_TOP, "top", "top"},
222 {GST_BASE_TEXT_OVERLAY_VALIGN_POS, "position", "position"},
223 {GST_BASE_TEXT_OVERLAY_VALIGN_CENTER, "center", "center"},
227 if (!base_text_overlay_valign_type) {
228 base_text_overlay_valign_type =
229 g_enum_register_static ("GstBaseTextOverlayVAlign",
230 base_text_overlay_valign);
232 return base_text_overlay_valign_type;
235 #define GST_TYPE_BASE_TEXT_OVERLAY_HALIGN (gst_base_text_overlay_halign_get_type())
237 gst_base_text_overlay_halign_get_type (void)
239 static GType base_text_overlay_halign_type = 0;
240 static const GEnumValue base_text_overlay_halign[] = {
241 {GST_BASE_TEXT_OVERLAY_HALIGN_LEFT, "left", "left"},
242 {GST_BASE_TEXT_OVERLAY_HALIGN_CENTER, "center", "center"},
243 {GST_BASE_TEXT_OVERLAY_HALIGN_RIGHT, "right", "right"},
244 {GST_BASE_TEXT_OVERLAY_HALIGN_POS, "position", "position"},
248 if (!base_text_overlay_halign_type) {
249 base_text_overlay_halign_type =
250 g_enum_register_static ("GstBaseTextOverlayHAlign",
251 base_text_overlay_halign);
253 return base_text_overlay_halign_type;
257 #define GST_TYPE_BASE_TEXT_OVERLAY_WRAP_MODE (gst_base_text_overlay_wrap_mode_get_type())
259 gst_base_text_overlay_wrap_mode_get_type (void)
261 static GType base_text_overlay_wrap_mode_type = 0;
262 static const GEnumValue base_text_overlay_wrap_mode[] = {
263 {GST_BASE_TEXT_OVERLAY_WRAP_MODE_NONE, "none", "none"},
264 {GST_BASE_TEXT_OVERLAY_WRAP_MODE_WORD, "word", "word"},
265 {GST_BASE_TEXT_OVERLAY_WRAP_MODE_CHAR, "char", "char"},
266 {GST_BASE_TEXT_OVERLAY_WRAP_MODE_WORD_CHAR, "wordchar", "wordchar"},
270 if (!base_text_overlay_wrap_mode_type) {
271 base_text_overlay_wrap_mode_type =
272 g_enum_register_static ("GstBaseTextOverlayWrapMode",
273 base_text_overlay_wrap_mode);
275 return base_text_overlay_wrap_mode_type;
278 #define GST_TYPE_BASE_TEXT_OVERLAY_LINE_ALIGN (gst_base_text_overlay_line_align_get_type())
280 gst_base_text_overlay_line_align_get_type (void)
282 static GType base_text_overlay_line_align_type = 0;
283 static const GEnumValue base_text_overlay_line_align[] = {
284 {GST_BASE_TEXT_OVERLAY_LINE_ALIGN_LEFT, "left", "left"},
285 {GST_BASE_TEXT_OVERLAY_LINE_ALIGN_CENTER, "center", "center"},
286 {GST_BASE_TEXT_OVERLAY_LINE_ALIGN_RIGHT, "right", "right"},
290 if (!base_text_overlay_line_align_type) {
291 base_text_overlay_line_align_type =
292 g_enum_register_static ("GstBaseTextOverlayLineAlign",
293 base_text_overlay_line_align);
295 return base_text_overlay_line_align_type;
298 #define GST_BASE_TEXT_OVERLAY_GET_LOCK(ov) (&GST_BASE_TEXT_OVERLAY (ov)->lock)
299 #define GST_BASE_TEXT_OVERLAY_GET_COND(ov) (&GST_BASE_TEXT_OVERLAY (ov)->cond)
300 #define GST_BASE_TEXT_OVERLAY_LOCK(ov) (g_mutex_lock (GST_BASE_TEXT_OVERLAY_GET_LOCK (ov)))
301 #define GST_BASE_TEXT_OVERLAY_UNLOCK(ov) (g_mutex_unlock (GST_BASE_TEXT_OVERLAY_GET_LOCK (ov)))
302 #define GST_BASE_TEXT_OVERLAY_WAIT(ov) (g_cond_wait (GST_BASE_TEXT_OVERLAY_GET_COND (ov), GST_BASE_TEXT_OVERLAY_GET_LOCK (ov)))
303 #define GST_BASE_TEXT_OVERLAY_SIGNAL(ov) (g_cond_signal (GST_BASE_TEXT_OVERLAY_GET_COND (ov)))
304 #define GST_BASE_TEXT_OVERLAY_BROADCAST(ov)(g_cond_broadcast (GST_BASE_TEXT_OVERLAY_GET_COND (ov)))
306 static GstElementClass *parent_class = NULL;
307 static void gst_base_text_overlay_base_init (gpointer g_class);
308 static void gst_base_text_overlay_class_init (GstBaseTextOverlayClass * klass);
309 static void gst_base_text_overlay_init (GstBaseTextOverlay * overlay,
310 GstBaseTextOverlayClass * klass);
312 static GstStateChangeReturn gst_base_text_overlay_change_state (GstElement *
313 element, GstStateChange transition);
315 static GstCaps *gst_base_text_overlay_getcaps (GstPad * pad,
316 GstBaseTextOverlay * overlay, GstCaps * filter);
317 static gboolean gst_base_text_overlay_setcaps (GstBaseTextOverlay * overlay,
319 static gboolean gst_base_text_overlay_setcaps_txt (GstBaseTextOverlay * overlay,
321 static gboolean gst_base_text_overlay_src_event (GstPad * pad,
322 GstObject * parent, GstEvent * event);
323 static gboolean gst_base_text_overlay_src_query (GstPad * pad,
324 GstObject * parent, GstQuery * query);
326 static gboolean gst_base_text_overlay_video_event (GstPad * pad,
327 GstObject * parent, GstEvent * event);
328 static gboolean gst_base_text_overlay_video_query (GstPad * pad,
329 GstObject * parent, GstQuery * query);
330 static GstFlowReturn gst_base_text_overlay_video_chain (GstPad * pad,
331 GstObject * parent, GstBuffer * buffer);
333 static gboolean gst_base_text_overlay_text_event (GstPad * pad,
334 GstObject * parent, GstEvent * event);
335 static GstFlowReturn gst_base_text_overlay_text_chain (GstPad * pad,
336 GstObject * parent, GstBuffer * buffer);
337 static GstPadLinkReturn gst_base_text_overlay_text_pad_link (GstPad * pad,
339 static void gst_base_text_overlay_text_pad_unlink (GstPad * pad);
340 static void gst_base_text_overlay_pop_text (GstBaseTextOverlay * overlay);
341 static void gst_base_text_overlay_update_render_mode (GstBaseTextOverlay *
344 static void gst_base_text_overlay_finalize (GObject * object);
345 static void gst_base_text_overlay_set_property (GObject * object, guint prop_id,
346 const GValue * value, GParamSpec * pspec);
347 static void gst_base_text_overlay_get_property (GObject * object, guint prop_id,
348 GValue * value, GParamSpec * pspec);
350 gst_base_text_overlay_adjust_values_with_fontdesc (GstBaseTextOverlay * overlay,
351 PangoFontDescription * desc);
354 gst_base_text_overlay_get_type (void)
356 static GType type = 0;
358 if (g_once_init_enter ((gsize *) & type)) {
359 static const GTypeInfo info = {
360 sizeof (GstBaseTextOverlayClass),
361 (GBaseInitFunc) gst_base_text_overlay_base_init,
363 (GClassInitFunc) gst_base_text_overlay_class_init,
366 sizeof (GstBaseTextOverlay),
368 (GInstanceInitFunc) gst_base_text_overlay_init,
371 g_once_init_leave ((gsize *) & type,
372 g_type_register_static (GST_TYPE_ELEMENT, "GstBaseTextOverlay", &info,
380 gst_base_text_overlay_get_text (GstBaseTextOverlay * overlay,
381 GstBuffer * video_frame)
383 return g_strdup (overlay->default_text);
387 gst_base_text_overlay_base_init (gpointer g_class)
389 GstBaseTextOverlayClass *klass = GST_BASE_TEXT_OVERLAY_CLASS (g_class);
390 PangoFontMap *fontmap;
392 /* Only lock for the subclasses here, the base class
393 * doesn't have this mutex yet and it's not necessary
395 if (klass->pango_lock)
396 g_mutex_lock (klass->pango_lock);
397 fontmap = pango_cairo_font_map_get_default ();
398 klass->pango_context =
399 pango_font_map_create_context (PANGO_FONT_MAP (fontmap));
400 if (klass->pango_lock)
401 g_mutex_unlock (klass->pango_lock);
405 gst_base_text_overlay_class_init (GstBaseTextOverlayClass * klass)
407 GObjectClass *gobject_class;
408 GstElementClass *gstelement_class;
410 gobject_class = (GObjectClass *) klass;
411 gstelement_class = (GstElementClass *) klass;
413 parent_class = g_type_class_peek_parent (klass);
415 gobject_class->finalize = gst_base_text_overlay_finalize;
416 gobject_class->set_property = gst_base_text_overlay_set_property;
417 gobject_class->get_property = gst_base_text_overlay_get_property;
419 gst_element_class_add_pad_template (gstelement_class,
420 gst_static_pad_template_get (&src_template_factory));
421 gst_element_class_add_pad_template (gstelement_class,
422 gst_static_pad_template_get (&video_sink_template_factory));
424 gstelement_class->change_state =
425 GST_DEBUG_FUNCPTR (gst_base_text_overlay_change_state);
427 klass->pango_lock = g_slice_new (GMutex);
428 g_mutex_init (klass->pango_lock);
430 klass->get_text = gst_base_text_overlay_get_text;
432 g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_TEXT,
433 g_param_spec_string ("text", "text",
434 "Text to be display.", DEFAULT_PROP_TEXT,
435 G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
436 g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_SHADING,
437 g_param_spec_boolean ("shaded-background", "shaded background",
438 "Whether to shade the background under the text area",
439 DEFAULT_PROP_SHADING, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
440 g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_VALIGNMENT,
441 g_param_spec_enum ("valignment", "vertical alignment",
442 "Vertical alignment of the text", GST_TYPE_BASE_TEXT_OVERLAY_VALIGN,
443 DEFAULT_PROP_VALIGNMENT, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
444 g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_HALIGNMENT,
445 g_param_spec_enum ("halignment", "horizontal alignment",
446 "Horizontal alignment of the text", GST_TYPE_BASE_TEXT_OVERLAY_HALIGN,
447 DEFAULT_PROP_HALIGNMENT, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
448 g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_VALIGN,
449 g_param_spec_string ("valign", "vertical alignment",
450 "Vertical alignment of the text (deprecated; use valignment)",
451 DEFAULT_PROP_VALIGN, G_PARAM_WRITABLE | G_PARAM_STATIC_STRINGS));
452 g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_HALIGN,
453 g_param_spec_string ("halign", "horizontal alignment",
454 "Horizontal alignment of the text (deprecated; use halignment)",
455 DEFAULT_PROP_HALIGN, G_PARAM_WRITABLE | G_PARAM_STATIC_STRINGS));
456 g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_XPAD,
457 g_param_spec_int ("xpad", "horizontal paddding",
458 "Horizontal paddding when using left/right alignment", 0, G_MAXINT,
459 DEFAULT_PROP_XPAD, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
460 g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_YPAD,
461 g_param_spec_int ("ypad", "vertical padding",
462 "Vertical padding when using top/bottom alignment", 0, G_MAXINT,
463 DEFAULT_PROP_YPAD, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
464 g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_DELTAX,
465 g_param_spec_int ("deltax", "X position modifier",
466 "Shift X position to the left or to the right. Unit is pixels.",
467 G_MININT, G_MAXINT, DEFAULT_PROP_DELTAX,
468 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
469 g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_DELTAY,
470 g_param_spec_int ("deltay", "Y position modifier",
471 "Shift Y position up or down. Unit is pixels.", G_MININT, G_MAXINT,
472 DEFAULT_PROP_DELTAY, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
474 * GstBaseTextOverlay:xpos
476 * Horizontal position of the rendered text when using positioned alignment.
480 g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_XPOS,
481 g_param_spec_double ("xpos", "horizontal position",
482 "Horizontal position when using position alignment", 0, 1.0,
484 G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
486 * GstBaseTextOverlay:ypos
488 * Vertical position of the rendered text when using positioned alignment.
492 g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_YPOS,
493 g_param_spec_double ("ypos", "vertical position",
494 "Vertical position when using position alignment", 0, 1.0,
496 G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
497 g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_WRAP_MODE,
498 g_param_spec_enum ("wrap-mode", "wrap mode",
499 "Whether to wrap the text and if so how.",
500 GST_TYPE_BASE_TEXT_OVERLAY_WRAP_MODE, DEFAULT_PROP_WRAP_MODE,
501 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
502 g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_FONT_DESC,
503 g_param_spec_string ("font-desc", "font description",
504 "Pango font description of font to be used for rendering. "
505 "See documentation of pango_font_description_from_string "
506 "for syntax.", DEFAULT_PROP_FONT_DESC,
507 G_PARAM_WRITABLE | G_PARAM_STATIC_STRINGS));
509 * GstBaseTextOverlay:color
511 * Color of the rendered text.
515 g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_COLOR,
516 g_param_spec_uint ("color", "Color",
517 "Color to use for text (big-endian ARGB).", 0, G_MAXUINT32,
519 G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
521 * GstTextOverlay:outline-color
523 * Color of the outline of the rendered text.
527 g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_OUTLINE_COLOR,
528 g_param_spec_uint ("outline-color", "Text Outline Color",
529 "Color to use for outline the text (big-endian ARGB).", 0,
530 G_MAXUINT32, DEFAULT_PROP_OUTLINE_COLOR,
531 G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
534 * GstBaseTextOverlay:line-alignment
536 * Alignment of text lines relative to each other (for multi-line text)
540 g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_LINE_ALIGNMENT,
541 g_param_spec_enum ("line-alignment", "line alignment",
542 "Alignment of text lines relative to each other.",
543 GST_TYPE_BASE_TEXT_OVERLAY_LINE_ALIGN, DEFAULT_PROP_LINE_ALIGNMENT,
544 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
546 * GstBaseTextOverlay:silent
548 * If set, no text is rendered. Useful to switch off text rendering
549 * temporarily without removing the textoverlay element from the pipeline.
553 /* FIXME 0.11: rename to "visible" or "text-visible" or "render-text" */
554 g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_SILENT,
555 g_param_spec_boolean ("silent", "silent",
556 "Whether to render the text string",
558 G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
560 * GstBaseTextOverlay:wait-text
562 * If set, the video will block until a subtitle is received on the text pad.
563 * If video and subtitles are sent in sync, like from the same demuxer, this
564 * property should be set.
568 g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_WAIT_TEXT,
569 g_param_spec_boolean ("wait-text", "Wait Text",
570 "Whether to wait for subtitles",
571 DEFAULT_PROP_WAIT_TEXT, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
573 g_object_class_install_property (G_OBJECT_CLASS (klass),
574 PROP_AUTO_ADJUST_SIZE, g_param_spec_boolean ("auto-resize", "auto resize",
575 "Automatically adjust font size to screen-size.",
576 DEFAULT_PROP_AUTO_ADJUST_SIZE,
577 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
579 g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_VERTICAL_RENDER,
580 g_param_spec_boolean ("vertical-render", "vertical render",
581 "Vertical Render.", DEFAULT_PROP_VERTICAL_RENDER,
582 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
586 gst_base_text_overlay_finalize (GObject * object)
588 GstBaseTextOverlay *overlay = GST_BASE_TEXT_OVERLAY (object);
590 g_free (overlay->default_text);
592 if (overlay->composition) {
593 gst_video_overlay_composition_unref (overlay->composition);
594 overlay->composition = NULL;
597 if (overlay->text_image) {
598 gst_buffer_unref (overlay->text_image);
599 overlay->text_image = NULL;
602 if (overlay->layout) {
603 g_object_unref (overlay->layout);
604 overlay->layout = NULL;
607 if (overlay->text_buffer) {
608 gst_buffer_unref (overlay->text_buffer);
609 overlay->text_buffer = NULL;
612 g_mutex_clear (&overlay->lock);
613 g_cond_clear (&overlay->cond);
615 G_OBJECT_CLASS (parent_class)->finalize (object);
619 gst_base_text_overlay_init (GstBaseTextOverlay * overlay,
620 GstBaseTextOverlayClass * klass)
622 GstPadTemplate *template;
623 PangoFontDescription *desc;
626 template = gst_static_pad_template_get (&video_sink_template_factory);
627 overlay->video_sinkpad = gst_pad_new_from_template (template, "video_sink");
628 gst_object_unref (template);
629 gst_pad_set_event_function (overlay->video_sinkpad,
630 GST_DEBUG_FUNCPTR (gst_base_text_overlay_video_event));
631 gst_pad_set_chain_function (overlay->video_sinkpad,
632 GST_DEBUG_FUNCPTR (gst_base_text_overlay_video_chain));
633 gst_pad_set_query_function (overlay->video_sinkpad,
634 GST_DEBUG_FUNCPTR (gst_base_text_overlay_video_query));
635 gst_element_add_pad (GST_ELEMENT (overlay), overlay->video_sinkpad);
638 gst_element_class_get_pad_template (GST_ELEMENT_CLASS (klass),
642 overlay->text_sinkpad = gst_pad_new_from_template (template, "text_sink");
643 gst_object_unref (template);
645 gst_pad_set_event_function (overlay->text_sinkpad,
646 GST_DEBUG_FUNCPTR (gst_base_text_overlay_text_event));
647 gst_pad_set_chain_function (overlay->text_sinkpad,
648 GST_DEBUG_FUNCPTR (gst_base_text_overlay_text_chain));
649 gst_pad_set_link_function (overlay->text_sinkpad,
650 GST_DEBUG_FUNCPTR (gst_base_text_overlay_text_pad_link));
651 gst_pad_set_unlink_function (overlay->text_sinkpad,
652 GST_DEBUG_FUNCPTR (gst_base_text_overlay_text_pad_unlink));
653 gst_element_add_pad (GST_ELEMENT (overlay), overlay->text_sinkpad);
657 template = gst_static_pad_template_get (&src_template_factory);
658 overlay->srcpad = gst_pad_new_from_template (template, "src");
659 gst_object_unref (template);
660 gst_pad_set_event_function (overlay->srcpad,
661 GST_DEBUG_FUNCPTR (gst_base_text_overlay_src_event));
662 gst_pad_set_query_function (overlay->srcpad,
663 GST_DEBUG_FUNCPTR (gst_base_text_overlay_src_query));
664 gst_element_add_pad (GST_ELEMENT (overlay), overlay->srcpad);
666 g_mutex_lock (GST_BASE_TEXT_OVERLAY_GET_CLASS (overlay)->pango_lock);
667 overlay->line_align = DEFAULT_PROP_LINE_ALIGNMENT;
669 pango_layout_new (GST_BASE_TEXT_OVERLAY_GET_CLASS
670 (overlay)->pango_context);
672 pango_context_get_font_description (GST_BASE_TEXT_OVERLAY_GET_CLASS
673 (overlay)->pango_context);
674 gst_base_text_overlay_adjust_values_with_fontdesc (overlay, desc);
676 overlay->color = DEFAULT_PROP_COLOR;
677 overlay->outline_color = DEFAULT_PROP_OUTLINE_COLOR;
678 overlay->halign = DEFAULT_PROP_HALIGNMENT;
679 overlay->valign = DEFAULT_PROP_VALIGNMENT;
680 overlay->xpad = DEFAULT_PROP_XPAD;
681 overlay->ypad = DEFAULT_PROP_YPAD;
682 overlay->deltax = DEFAULT_PROP_DELTAX;
683 overlay->deltay = DEFAULT_PROP_DELTAY;
684 overlay->xpos = DEFAULT_PROP_XPOS;
685 overlay->ypos = DEFAULT_PROP_YPOS;
687 overlay->wrap_mode = DEFAULT_PROP_WRAP_MODE;
689 overlay->want_shading = DEFAULT_PROP_SHADING;
690 overlay->shading_value = DEFAULT_SHADING_VALUE;
691 overlay->silent = DEFAULT_PROP_SILENT;
692 overlay->wait_text = DEFAULT_PROP_WAIT_TEXT;
693 overlay->auto_adjust_size = DEFAULT_PROP_AUTO_ADJUST_SIZE;
695 overlay->default_text = g_strdup (DEFAULT_PROP_TEXT);
696 overlay->need_render = TRUE;
697 overlay->text_image = NULL;
698 overlay->use_vertical_render = DEFAULT_PROP_VERTICAL_RENDER;
699 gst_base_text_overlay_update_render_mode (overlay);
701 overlay->text_buffer = NULL;
702 overlay->text_linked = FALSE;
703 g_mutex_init (&overlay->lock);
704 g_cond_init (&overlay->cond);
705 gst_segment_init (&overlay->segment, GST_FORMAT_TIME);
706 g_mutex_unlock (GST_BASE_TEXT_OVERLAY_GET_CLASS (overlay)->pango_lock);
710 gst_base_text_overlay_update_wrap_mode (GstBaseTextOverlay * overlay)
712 if (overlay->wrap_mode == GST_BASE_TEXT_OVERLAY_WRAP_MODE_NONE) {
713 GST_DEBUG_OBJECT (overlay, "Set wrap mode NONE");
714 pango_layout_set_width (overlay->layout, -1);
718 if (overlay->auto_adjust_size) {
719 width = DEFAULT_SCALE_BASIS * PANGO_SCALE;
720 if (overlay->use_vertical_render) {
721 width = width * (overlay->height - overlay->ypad * 2) / overlay->width;
725 (overlay->use_vertical_render ? overlay->height : overlay->width) *
729 GST_DEBUG_OBJECT (overlay, "Set layout width %d", overlay->width);
730 GST_DEBUG_OBJECT (overlay, "Set wrap mode %d", overlay->wrap_mode);
731 pango_layout_set_width (overlay->layout, width);
732 pango_layout_set_wrap (overlay->layout, (PangoWrapMode) overlay->wrap_mode);
737 gst_base_text_overlay_update_render_mode (GstBaseTextOverlay * overlay)
739 PangoMatrix matrix = PANGO_MATRIX_INIT;
740 PangoContext *context = pango_layout_get_context (overlay->layout);
742 if (overlay->use_vertical_render) {
743 pango_matrix_rotate (&matrix, -90);
744 pango_context_set_base_gravity (context, PANGO_GRAVITY_AUTO);
745 pango_context_set_matrix (context, &matrix);
746 pango_layout_set_alignment (overlay->layout, PANGO_ALIGN_LEFT);
748 pango_context_set_base_gravity (context, PANGO_GRAVITY_SOUTH);
749 pango_context_set_matrix (context, &matrix);
750 pango_layout_set_alignment (overlay->layout,
751 (PangoAlignment) overlay->line_align);
756 gst_base_text_overlay_setcaps_txt (GstBaseTextOverlay * overlay, GstCaps * caps)
758 GstStructure *structure;
760 structure = gst_caps_get_structure (caps, 0);
761 overlay->have_pango_markup =
762 gst_structure_has_name (structure, "text/x-pango-markup");
767 /* FIXME: upstream nego (e.g. when the video window is resized) */
770 gst_base_text_overlay_setcaps (GstBaseTextOverlay * overlay, GstCaps * caps)
773 gboolean ret = FALSE;
775 if (!gst_video_info_from_caps (&info, caps))
778 overlay->info = info;
779 overlay->format = GST_VIDEO_INFO_FORMAT (&info);
780 overlay->width = GST_VIDEO_INFO_WIDTH (&info);
781 overlay->height = GST_VIDEO_INFO_HEIGHT (&info);
783 ret = gst_pad_set_caps (overlay->srcpad, caps);
787 GstStructure *structure;
790 GST_BASE_TEXT_OVERLAY_LOCK (overlay);
791 g_mutex_lock (GST_BASE_TEXT_OVERLAY_GET_CLASS (overlay)->pango_lock);
793 /* FIXME Use the query to the sink to do that when implemented */
794 /* Update wether to attach composition to buffer or do the composition
797 structure = gst_caps_get_structure (caps, 0);
798 if (gst_structure_has_name (structure, "video/x-surface"))
799 overlay->attach_compo_to_buffer = TRUE;
801 overlay->attach_compo_to_buffer = FALSE;
803 GST_FIXME_OBJECT (overlay, "query downstream for overlay support");
804 overlay->attach_compo_to_buffer = FALSE;
807 gst_base_text_overlay_update_wrap_mode (overlay);
808 g_mutex_unlock (GST_BASE_TEXT_OVERLAY_GET_CLASS (overlay)->pango_lock);
809 GST_BASE_TEXT_OVERLAY_UNLOCK (overlay);
817 GST_DEBUG_OBJECT (overlay, "could not parse caps");
823 gst_base_text_overlay_set_property (GObject * object, guint prop_id,
824 const GValue * value, GParamSpec * pspec)
826 GstBaseTextOverlay *overlay = GST_BASE_TEXT_OVERLAY (object);
828 GST_BASE_TEXT_OVERLAY_LOCK (overlay);
831 g_free (overlay->default_text);
832 overlay->default_text = g_value_dup_string (value);
833 overlay->need_render = TRUE;
836 overlay->want_shading = g_value_get_boolean (value);
839 overlay->xpad = g_value_get_int (value);
842 overlay->ypad = g_value_get_int (value);
845 overlay->deltax = g_value_get_int (value);
848 overlay->deltay = g_value_get_int (value);
851 overlay->xpos = g_value_get_double (value);
854 overlay->ypos = g_value_get_double (value);
857 const gchar *s = g_value_get_string (value);
859 if (s && g_ascii_strcasecmp (s, "left") == 0)
860 overlay->halign = GST_BASE_TEXT_OVERLAY_HALIGN_LEFT;
861 else if (s && g_ascii_strcasecmp (s, "center") == 0)
862 overlay->halign = GST_BASE_TEXT_OVERLAY_HALIGN_CENTER;
863 else if (s && g_ascii_strcasecmp (s, "right") == 0)
864 overlay->halign = GST_BASE_TEXT_OVERLAY_HALIGN_RIGHT;
866 g_warning ("Invalid value '%s' for textoverlay property 'halign'",
871 const gchar *s = g_value_get_string (value);
873 if (s && g_ascii_strcasecmp (s, "baseline") == 0)
874 overlay->valign = GST_BASE_TEXT_OVERLAY_VALIGN_BASELINE;
875 else if (s && g_ascii_strcasecmp (s, "bottom") == 0)
876 overlay->valign = GST_BASE_TEXT_OVERLAY_VALIGN_BOTTOM;
877 else if (s && g_ascii_strcasecmp (s, "top") == 0)
878 overlay->valign = GST_BASE_TEXT_OVERLAY_VALIGN_TOP;
880 g_warning ("Invalid value '%s' for textoverlay property 'valign'",
884 case PROP_VALIGNMENT:
885 overlay->valign = g_value_get_enum (value);
887 case PROP_HALIGNMENT:
888 overlay->halign = g_value_get_enum (value);
891 overlay->wrap_mode = g_value_get_enum (value);
892 g_mutex_lock (GST_BASE_TEXT_OVERLAY_GET_CLASS (overlay)->pango_lock);
893 gst_base_text_overlay_update_wrap_mode (overlay);
894 g_mutex_unlock (GST_BASE_TEXT_OVERLAY_GET_CLASS (overlay)->pango_lock);
898 PangoFontDescription *desc;
899 const gchar *fontdesc_str;
901 fontdesc_str = g_value_get_string (value);
902 g_mutex_lock (GST_BASE_TEXT_OVERLAY_GET_CLASS (overlay)->pango_lock);
903 desc = pango_font_description_from_string (fontdesc_str);
905 GST_LOG_OBJECT (overlay, "font description set: %s", fontdesc_str);
906 pango_layout_set_font_description (overlay->layout, desc);
907 gst_base_text_overlay_adjust_values_with_fontdesc (overlay, desc);
908 pango_font_description_free (desc);
910 GST_WARNING_OBJECT (overlay, "font description parse failed: %s",
913 g_mutex_unlock (GST_BASE_TEXT_OVERLAY_GET_CLASS (overlay)->pango_lock);
917 overlay->color = g_value_get_uint (value);
919 case PROP_OUTLINE_COLOR:
920 overlay->outline_color = g_value_get_uint (value);
923 overlay->silent = g_value_get_boolean (value);
925 case PROP_LINE_ALIGNMENT:
926 overlay->line_align = g_value_get_enum (value);
927 g_mutex_lock (GST_BASE_TEXT_OVERLAY_GET_CLASS (overlay)->pango_lock);
928 pango_layout_set_alignment (overlay->layout,
929 (PangoAlignment) overlay->line_align);
930 g_mutex_unlock (GST_BASE_TEXT_OVERLAY_GET_CLASS (overlay)->pango_lock);
933 overlay->wait_text = g_value_get_boolean (value);
935 case PROP_AUTO_ADJUST_SIZE:
936 overlay->auto_adjust_size = g_value_get_boolean (value);
937 overlay->need_render = TRUE;
939 case PROP_VERTICAL_RENDER:
940 overlay->use_vertical_render = g_value_get_boolean (value);
941 g_mutex_lock (GST_BASE_TEXT_OVERLAY_GET_CLASS (overlay)->pango_lock);
942 gst_base_text_overlay_update_render_mode (overlay);
943 g_mutex_unlock (GST_BASE_TEXT_OVERLAY_GET_CLASS (overlay)->pango_lock);
944 overlay->need_render = TRUE;
947 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
951 overlay->need_render = TRUE;
952 GST_BASE_TEXT_OVERLAY_UNLOCK (overlay);
956 gst_base_text_overlay_get_property (GObject * object, guint prop_id,
957 GValue * value, GParamSpec * pspec)
959 GstBaseTextOverlay *overlay = GST_BASE_TEXT_OVERLAY (object);
961 GST_BASE_TEXT_OVERLAY_LOCK (overlay);
964 g_value_set_string (value, overlay->default_text);
967 g_value_set_boolean (value, overlay->want_shading);
970 g_value_set_int (value, overlay->xpad);
973 g_value_set_int (value, overlay->ypad);
976 g_value_set_int (value, overlay->deltax);
979 g_value_set_int (value, overlay->deltay);
982 g_value_set_double (value, overlay->xpos);
985 g_value_set_double (value, overlay->ypos);
987 case PROP_VALIGNMENT:
988 g_value_set_enum (value, overlay->valign);
990 case PROP_HALIGNMENT:
991 g_value_set_enum (value, overlay->halign);
994 g_value_set_enum (value, overlay->wrap_mode);
997 g_value_set_boolean (value, overlay->silent);
999 case PROP_LINE_ALIGNMENT:
1000 g_value_set_enum (value, overlay->line_align);
1002 case PROP_WAIT_TEXT:
1003 g_value_set_boolean (value, overlay->wait_text);
1005 case PROP_AUTO_ADJUST_SIZE:
1006 g_value_set_boolean (value, overlay->auto_adjust_size);
1008 case PROP_VERTICAL_RENDER:
1009 g_value_set_boolean (value, overlay->use_vertical_render);
1012 g_value_set_uint (value, overlay->color);
1014 case PROP_OUTLINE_COLOR:
1015 g_value_set_uint (value, overlay->outline_color);
1018 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
1022 overlay->need_render = TRUE;
1023 GST_BASE_TEXT_OVERLAY_UNLOCK (overlay);
1027 gst_base_text_overlay_src_query (GstPad * pad, GstObject * parent,
1030 gboolean ret = FALSE;
1031 GstBaseTextOverlay *overlay;
1033 overlay = GST_BASE_TEXT_OVERLAY (parent);
1035 switch (GST_QUERY_TYPE (query)) {
1036 case GST_QUERY_CAPS:
1038 GstCaps *filter, *caps;
1040 gst_query_parse_caps (query, &filter);
1041 caps = gst_base_text_overlay_getcaps (pad, overlay, filter);
1042 gst_query_set_caps_result (query, caps);
1043 gst_caps_unref (caps);
1048 ret = gst_pad_peer_query (overlay->video_sinkpad, query);
1056 gst_base_text_overlay_src_event (GstPad * pad, GstObject * parent,
1059 gboolean ret = FALSE;
1060 GstBaseTextOverlay *overlay = NULL;
1062 overlay = GST_BASE_TEXT_OVERLAY (parent);
1064 switch (GST_EVENT_TYPE (event)) {
1065 case GST_EVENT_SEEK:{
1068 /* We don't handle seek if we have not text pad */
1069 if (!overlay->text_linked) {
1070 GST_DEBUG_OBJECT (overlay, "seek received, pushing upstream");
1071 ret = gst_pad_push_event (overlay->video_sinkpad, event);
1075 GST_DEBUG_OBJECT (overlay, "seek received, driving from here");
1077 gst_event_parse_seek (event, NULL, NULL, &flags, NULL, NULL, NULL, NULL);
1079 /* Flush downstream, only for flushing seek */
1080 if (flags & GST_SEEK_FLAG_FLUSH)
1081 gst_pad_push_event (overlay->srcpad, gst_event_new_flush_start ());
1083 /* Mark ourself as flushing, unblock chains */
1084 GST_BASE_TEXT_OVERLAY_LOCK (overlay);
1085 overlay->video_flushing = TRUE;
1086 overlay->text_flushing = TRUE;
1087 gst_base_text_overlay_pop_text (overlay);
1088 GST_BASE_TEXT_OVERLAY_UNLOCK (overlay);
1090 /* Seek on each sink pad */
1091 gst_event_ref (event);
1092 ret = gst_pad_push_event (overlay->video_sinkpad, event);
1094 ret = gst_pad_push_event (overlay->text_sinkpad, event);
1096 gst_event_unref (event);
1101 if (overlay->text_linked) {
1102 gst_event_ref (event);
1103 ret = gst_pad_push_event (overlay->video_sinkpad, event);
1104 gst_pad_push_event (overlay->text_sinkpad, event);
1106 ret = gst_pad_push_event (overlay->video_sinkpad, event);
1117 gst_base_text_overlay_getcaps (GstPad * pad, GstBaseTextOverlay * overlay,
1123 if (G_UNLIKELY (!overlay))
1124 return gst_pad_get_pad_template_caps (pad);
1126 if (pad == overlay->srcpad)
1127 otherpad = overlay->video_sinkpad;
1129 otherpad = overlay->srcpad;
1131 /* we can do what the peer can */
1132 caps = gst_pad_peer_query_caps (otherpad, filter);
1134 GstCaps *temp, *templ;
1136 GST_DEBUG_OBJECT (pad, "peer caps %" GST_PTR_FORMAT, caps);
1138 /* filtered against our padtemplate */
1139 templ = gst_pad_get_pad_template_caps (otherpad);
1140 GST_DEBUG_OBJECT (pad, "our template %" GST_PTR_FORMAT, templ);
1141 temp = gst_caps_intersect_full (caps, templ, GST_CAPS_INTERSECT_FIRST);
1142 GST_DEBUG_OBJECT (pad, "intersected %" GST_PTR_FORMAT, temp);
1143 gst_caps_unref (caps);
1144 gst_caps_unref (templ);
1145 /* this is what we can do */
1148 /* no peer, our padtemplate is enough then */
1149 caps = gst_pad_get_pad_template_caps (pad);
1151 GstCaps *intersection;
1154 gst_caps_intersect_full (filter, caps, GST_CAPS_INTERSECT_FIRST);
1155 gst_caps_unref (caps);
1156 caps = intersection;
1160 GST_DEBUG_OBJECT (overlay, "returning %" GST_PTR_FORMAT, caps);
1166 gst_base_text_overlay_adjust_values_with_fontdesc (GstBaseTextOverlay * overlay,
1167 PangoFontDescription * desc)
1169 gint font_size = pango_font_description_get_size (desc) / PANGO_SCALE;
1170 overlay->shadow_offset = (double) (font_size) / 13.0;
1171 overlay->outline_offset = (double) (font_size) / 15.0;
1172 if (overlay->outline_offset < MINIMUM_OUTLINE_OFFSET)
1173 overlay->outline_offset = MINIMUM_OUTLINE_OFFSET;
1177 gst_base_text_overlay_get_pos (GstBaseTextOverlay * overlay,
1178 gint * xpos, gint * ypos)
1181 GstBaseTextOverlayVAlign valign;
1182 GstBaseTextOverlayHAlign halign;
1184 width = overlay->image_width;
1185 height = overlay->image_height;
1187 if (overlay->use_vertical_render)
1188 halign = GST_BASE_TEXT_OVERLAY_HALIGN_RIGHT;
1190 halign = overlay->halign;
1193 case GST_BASE_TEXT_OVERLAY_HALIGN_LEFT:
1194 *xpos = overlay->xpad;
1196 case GST_BASE_TEXT_OVERLAY_HALIGN_CENTER:
1197 *xpos = (overlay->width - width) / 2;
1199 case GST_BASE_TEXT_OVERLAY_HALIGN_RIGHT:
1200 *xpos = overlay->width - width - overlay->xpad;
1202 case GST_BASE_TEXT_OVERLAY_HALIGN_POS:
1203 *xpos = (gint) (overlay->width * overlay->xpos) - width / 2;
1204 *xpos = CLAMP (*xpos, 0, overlay->width - width);
1211 *xpos += overlay->deltax;
1213 if (overlay->use_vertical_render)
1214 valign = GST_BASE_TEXT_OVERLAY_VALIGN_TOP;
1216 valign = overlay->valign;
1219 case GST_BASE_TEXT_OVERLAY_VALIGN_BOTTOM:
1220 *ypos = overlay->height - height - overlay->ypad;
1222 case GST_BASE_TEXT_OVERLAY_VALIGN_BASELINE:
1223 *ypos = overlay->height - (height + overlay->ypad);
1225 case GST_BASE_TEXT_OVERLAY_VALIGN_TOP:
1226 *ypos = overlay->ypad;
1228 case GST_BASE_TEXT_OVERLAY_VALIGN_POS:
1229 *ypos = (gint) (overlay->height * overlay->ypos) - height / 2;
1230 *ypos = CLAMP (*ypos, 0, overlay->height - height);
1232 case GST_BASE_TEXT_OVERLAY_VALIGN_CENTER:
1233 *ypos = (overlay->height - height) / 2;
1236 *ypos = overlay->ypad;
1239 *ypos += overlay->deltay;
1243 gst_base_text_overlay_set_composition (GstBaseTextOverlay * overlay)
1246 GstVideoOverlayRectangle *rectangle;
1248 gst_base_text_overlay_get_pos (overlay, &xpos, &ypos);
1250 if (overlay->text_image) {
1251 rectangle = gst_video_overlay_rectangle_new_argb (overlay->text_image,
1252 overlay->image_width, overlay->image_height, 4 * overlay->image_width,
1253 xpos, ypos, overlay->image_width, overlay->image_height,
1254 GST_VIDEO_OVERLAY_FORMAT_FLAG_PREMULTIPLIED_ALPHA);
1256 if (overlay->composition)
1257 gst_video_overlay_composition_unref (overlay->composition);
1258 overlay->composition = gst_video_overlay_composition_new (rectangle);
1259 gst_video_overlay_rectangle_unref (rectangle);
1261 } else if (overlay->composition) {
1262 gst_video_overlay_composition_unref (overlay->composition);
1263 overlay->composition = NULL;
1268 gst_base_text_overlay_render_pangocairo (GstBaseTextOverlay * overlay,
1269 const gchar * string, gint textlen)
1272 cairo_surface_t *surface;
1273 PangoRectangle ink_rect, logical_rect;
1274 cairo_matrix_t cairo_matrix;
1276 double scalef = 1.0;
1281 g_mutex_lock (GST_BASE_TEXT_OVERLAY_GET_CLASS (overlay)->pango_lock);
1283 if (overlay->auto_adjust_size) {
1284 /* 640 pixel is default */
1285 scalef = (double) (overlay->width) / DEFAULT_SCALE_BASIS;
1287 pango_layout_set_width (overlay->layout, -1);
1288 /* set text on pango layout */
1289 pango_layout_set_markup (overlay->layout, string, textlen);
1291 /* get subtitle image size */
1292 pango_layout_get_pixel_extents (overlay->layout, &ink_rect, &logical_rect);
1294 width = (logical_rect.width + overlay->shadow_offset) * scalef;
1296 if (width + overlay->deltax >
1297 (overlay->use_vertical_render ? overlay->height : overlay->width)) {
1299 * subtitle image width is larger then overlay width
1300 * so rearrange overlay wrap mode.
1302 gst_base_text_overlay_update_wrap_mode (overlay);
1303 pango_layout_get_pixel_extents (overlay->layout, &ink_rect, &logical_rect);
1304 width = overlay->width;
1308 (logical_rect.height + logical_rect.y + overlay->shadow_offset) * scalef;
1309 if (height > overlay->height) {
1310 height = overlay->height;
1312 if (overlay->use_vertical_render) {
1313 PangoRectangle rect;
1314 PangoContext *context;
1315 PangoMatrix matrix = PANGO_MATRIX_INIT;
1318 context = pango_layout_get_context (overlay->layout);
1320 pango_matrix_rotate (&matrix, -90);
1322 rect.x = rect.y = 0;
1324 rect.height = height;
1325 pango_matrix_transform_pixel_rectangle (&matrix, &rect);
1326 matrix.x0 = -rect.x;
1327 matrix.y0 = -rect.y;
1329 pango_context_set_matrix (context, &matrix);
1331 cairo_matrix.xx = matrix.xx;
1332 cairo_matrix.yx = matrix.yx;
1333 cairo_matrix.xy = matrix.xy;
1334 cairo_matrix.yy = matrix.yy;
1335 cairo_matrix.x0 = matrix.x0;
1336 cairo_matrix.y0 = matrix.y0;
1337 cairo_matrix_scale (&cairo_matrix, scalef, scalef);
1343 cairo_matrix_init_scale (&cairo_matrix, scalef, scalef);
1346 /* reallocate overlay buffer */
1347 buffer = gst_buffer_new_and_alloc (4 * width * height);
1348 gst_buffer_replace (&overlay->text_image, buffer);
1349 gst_buffer_unref (buffer);
1351 gst_buffer_map (buffer, &map, GST_MAP_READWRITE);
1352 surface = cairo_image_surface_create_for_data (map.data,
1353 CAIRO_FORMAT_ARGB32, width, height, width * 4);
1354 cr = cairo_create (surface);
1357 cairo_set_operator (cr, CAIRO_OPERATOR_CLEAR);
1360 cairo_set_operator (cr, CAIRO_OPERATOR_OVER);
1362 if (overlay->want_shading)
1363 cairo_paint_with_alpha (cr, overlay->shading_value);
1365 /* apply transformations */
1366 cairo_set_matrix (cr, &cairo_matrix);
1368 /* FIXME: We use show_layout everywhere except for the surface
1369 * because it's really faster and internally does all kinds of
1370 * caching. Unfortunately we have to paint to a cairo path for
1371 * the outline and this is slow. Once Pango supports user fonts
1372 * we should use them, see
1373 * https://bugzilla.gnome.org/show_bug.cgi?id=598695
1375 * Idea would the be, to create a cairo user font that
1376 * does shadow, outline, text painting in the
1377 * render_glyph function.
1380 /* draw shadow text */
1382 cairo_translate (cr, overlay->shadow_offset, overlay->shadow_offset);
1383 cairo_set_source_rgba (cr, 0.0, 0.0, 0.0, 0.5);
1384 pango_cairo_show_layout (cr, overlay->layout);
1387 a = (overlay->outline_color >> 24) & 0xff;
1388 r = (overlay->outline_color >> 16) & 0xff;
1389 g = (overlay->outline_color >> 8) & 0xff;
1390 b = (overlay->outline_color >> 0) & 0xff;
1392 /* draw outline text */
1394 cairo_set_source_rgba (cr, r / 255.0, g / 255.0, b / 255.0, a / 255.0);
1395 cairo_set_line_width (cr, overlay->outline_offset);
1396 pango_cairo_layout_path (cr, overlay->layout);
1400 a = (overlay->color >> 24) & 0xff;
1401 r = (overlay->color >> 16) & 0xff;
1402 g = (overlay->color >> 8) & 0xff;
1403 b = (overlay->color >> 0) & 0xff;
1407 cairo_set_source_rgba (cr, r / 255.0, g / 255.0, b / 255.0, a / 255.0);
1408 pango_cairo_show_layout (cr, overlay->layout);
1412 cairo_surface_destroy (surface);
1413 gst_buffer_unmap (buffer, &map);
1414 overlay->image_width = width;
1415 overlay->image_height = height;
1416 overlay->baseline_y = ink_rect.y;
1417 g_mutex_unlock (GST_BASE_TEXT_OVERLAY_GET_CLASS (overlay)->pango_lock);
1419 gst_base_text_overlay_set_composition (overlay);
1426 gst_base_text_overlay_shade_planar_Y (GstBaseTextOverlay * overlay,
1427 GstVideoFrame * dest, gint x0, gint x1, gint y0, gint y1)
1429 gint i, j, dest_stride;
1432 dest_stride = dest->info.stride[0];
1433 dest_ptr = dest->data[0];
1435 x0 = CLAMP (x0 - BOX_XPAD, 0, overlay->width);
1436 x1 = CLAMP (x1 + BOX_XPAD, 0, overlay->width);
1438 y0 = CLAMP (y0 - BOX_YPAD, 0, overlay->height);
1439 y1 = CLAMP (y1 + BOX_YPAD, 0, overlay->height);
1441 for (i = y0; i < y1; ++i) {
1442 for (j = x0; j < x1; ++j) {
1443 gint y = dest_ptr[(i * dest_stride) + j] + overlay->shading_value;
1445 dest_ptr[(i * dest_stride) + j] = CLAMP (y, 0, 255);
1451 gst_base_text_overlay_shade_packed_Y (GstBaseTextOverlay * overlay,
1452 GstVideoFrame * dest, gint x0, gint x1, gint y0, gint y1)
1455 guint dest_stride, pixel_stride;
1458 dest_stride = GST_VIDEO_FRAME_COMP_STRIDE (dest, 0);
1459 dest_ptr = GST_VIDEO_FRAME_COMP_DATA (dest, 0);
1460 pixel_stride = GST_VIDEO_FRAME_COMP_PSTRIDE (dest, 0);
1462 x0 = CLAMP (x0 - BOX_XPAD, 0, overlay->width);
1463 x1 = CLAMP (x1 + BOX_XPAD, 0, overlay->width);
1465 y0 = CLAMP (y0 - BOX_YPAD, 0, overlay->height);
1466 y1 = CLAMP (y1 + BOX_YPAD, 0, overlay->height);
1469 x0 = GST_VIDEO_FORMAT_INFO_SCALE_WIDTH (dest->info.finfo, 0, x0);
1471 x1 = GST_VIDEO_FORMAT_INFO_SCALE_WIDTH (dest->info.finfo, 0, x1);
1474 y0 = GST_VIDEO_FORMAT_INFO_SCALE_HEIGHT (dest->info.finfo, 0, y0);
1476 y1 = GST_VIDEO_FORMAT_INFO_SCALE_HEIGHT (dest->info.finfo, 0, y1);
1478 for (i = y0; i < y1; i++) {
1479 for (j = x0; j < x1; j++) {
1483 y_pos = (i * dest_stride) + j * pixel_stride;
1484 y = dest_ptr[y_pos] + overlay->shading_value;
1486 dest_ptr[y_pos] = CLAMP (y, 0, 255);
1491 #define gst_base_text_overlay_shade_BGRx gst_base_text_overlay_shade_xRGB
1492 #define gst_base_text_overlay_shade_RGBx gst_base_text_overlay_shade_xRGB
1493 #define gst_base_text_overlay_shade_xBGR gst_base_text_overlay_shade_xRGB
1495 gst_base_text_overlay_shade_xRGB (GstBaseTextOverlay * overlay,
1496 GstVideoFrame * dest, gint x0, gint x1, gint y0, gint y1)
1501 dest_ptr = dest->data[0];
1503 x0 = CLAMP (x0 - BOX_XPAD, 0, overlay->width);
1504 x1 = CLAMP (x1 + BOX_XPAD, 0, overlay->width);
1506 y0 = CLAMP (y0 - BOX_YPAD, 0, overlay->height);
1507 y1 = CLAMP (y1 + BOX_YPAD, 0, overlay->height);
1509 for (i = y0; i < y1; i++) {
1510 for (j = x0; j < x1; j++) {
1513 y_pos = (i * 4 * overlay->width) + j * 4;
1514 for (k = 0; k < 4; k++) {
1515 y = dest_ptr[y_pos + k] + overlay->shading_value;
1516 dest_ptr[y_pos + k] = CLAMP (y, 0, 255);
1522 #define ARGB_SHADE_FUNCTION(name, OFFSET) \
1523 static inline void \
1524 gst_base_text_overlay_shade_##name (GstBaseTextOverlay * overlay, GstVideoFrame * dest, \
1525 gint x0, gint x1, gint y0, gint y1) \
1530 dest_ptr = dest->data[0];\
1532 x0 = CLAMP (x0 - BOX_XPAD, 0, overlay->width);\
1533 x1 = CLAMP (x1 + BOX_XPAD, 0, overlay->width);\
1535 y0 = CLAMP (y0 - BOX_YPAD, 0, overlay->height);\
1536 y1 = CLAMP (y1 + BOX_YPAD, 0, overlay->height);\
1538 for (i = y0; i < y1; i++) {\
1539 for (j = x0; j < x1; j++) {\
1541 y_pos = (i * 4 * overlay->width) + j * 4;\
1542 for (k = OFFSET; k < 3+OFFSET; k++) {\
1543 y = dest_ptr[y_pos + k] + overlay->shading_value;\
1544 dest_ptr[y_pos + k] = CLAMP (y, 0, 255);\
1549 ARGB_SHADE_FUNCTION (ARGB, 1);
1550 ARGB_SHADE_FUNCTION (ABGR, 1);
1551 ARGB_SHADE_FUNCTION (RGBA, 0);
1552 ARGB_SHADE_FUNCTION (BGRA, 0);
1555 gst_base_text_overlay_render_text (GstBaseTextOverlay * overlay,
1556 const gchar * text, gint textlen)
1560 if (!overlay->need_render) {
1561 GST_DEBUG ("Using previously rendered text.");
1565 /* -1 is the whole string */
1566 if (text != NULL && textlen < 0) {
1567 textlen = strlen (text);
1571 string = g_strndup (text, textlen);
1572 } else { /* empty string */
1573 string = g_strdup (" ");
1575 g_strdelimit (string, "\r\t", ' ');
1576 textlen = strlen (string);
1578 /* FIXME: should we check for UTF-8 here? */
1580 GST_DEBUG ("Rendering '%s'", string);
1581 gst_base_text_overlay_render_pangocairo (overlay, string, textlen);
1585 overlay->need_render = FALSE;
1588 static GstFlowReturn
1589 gst_base_text_overlay_push_frame (GstBaseTextOverlay * overlay,
1590 GstBuffer * video_frame)
1593 GstVideoFrame frame;
1595 if (overlay->composition == NULL)
1598 video_frame = gst_buffer_make_writable (video_frame);
1600 if (overlay->attach_compo_to_buffer) {
1601 GST_DEBUG_OBJECT (overlay, "Attaching text overlay image to video buffer");
1602 gst_buffer_add_video_overlay_composition_meta (video_frame,
1603 overlay->composition);
1604 /* FIXME: emulate shaded background box if want_shading=true */
1608 if (!gst_video_frame_map (&frame, &overlay->info, video_frame,
1612 gst_base_text_overlay_get_pos (overlay, &xpos, &ypos);
1614 /* shaded background box */
1615 if (overlay->want_shading) {
1616 switch (overlay->format) {
1617 case GST_VIDEO_FORMAT_I420:
1618 case GST_VIDEO_FORMAT_NV12:
1619 case GST_VIDEO_FORMAT_NV21:
1620 gst_base_text_overlay_shade_planar_Y (overlay, &frame,
1621 xpos, xpos + overlay->image_width,
1622 ypos, ypos + overlay->image_height);
1624 case GST_VIDEO_FORMAT_AYUV:
1625 case GST_VIDEO_FORMAT_UYVY:
1626 gst_base_text_overlay_shade_packed_Y (overlay, &frame,
1627 xpos, xpos + overlay->image_width,
1628 ypos, ypos + overlay->image_height);
1630 case GST_VIDEO_FORMAT_xRGB:
1631 gst_base_text_overlay_shade_xRGB (overlay, &frame,
1632 xpos, xpos + overlay->image_width,
1633 ypos, ypos + overlay->image_height);
1635 case GST_VIDEO_FORMAT_xBGR:
1636 gst_base_text_overlay_shade_xBGR (overlay, &frame,
1637 xpos, xpos + overlay->image_width,
1638 ypos, ypos + overlay->image_height);
1640 case GST_VIDEO_FORMAT_BGRx:
1641 gst_base_text_overlay_shade_BGRx (overlay, &frame,
1642 xpos, xpos + overlay->image_width,
1643 ypos, ypos + overlay->image_height);
1645 case GST_VIDEO_FORMAT_RGBx:
1646 gst_base_text_overlay_shade_RGBx (overlay, &frame,
1647 xpos, xpos + overlay->image_width,
1648 ypos, ypos + overlay->image_height);
1650 case GST_VIDEO_FORMAT_ARGB:
1651 gst_base_text_overlay_shade_ARGB (overlay, &frame,
1652 xpos, xpos + overlay->image_width,
1653 ypos, ypos + overlay->image_height);
1655 case GST_VIDEO_FORMAT_ABGR:
1656 gst_base_text_overlay_shade_ABGR (overlay, &frame,
1657 xpos, xpos + overlay->image_width,
1658 ypos, ypos + overlay->image_height);
1660 case GST_VIDEO_FORMAT_RGBA:
1661 gst_base_text_overlay_shade_RGBA (overlay, &frame,
1662 xpos, xpos + overlay->image_width,
1663 ypos, ypos + overlay->image_height);
1665 case GST_VIDEO_FORMAT_BGRA:
1666 gst_base_text_overlay_shade_BGRA (overlay, &frame,
1667 xpos, xpos + overlay->image_width,
1668 ypos, ypos + overlay->image_height);
1671 g_assert_not_reached ();
1675 gst_video_overlay_composition_blend (overlay->composition, &frame);
1677 gst_video_frame_unmap (&frame);
1681 return gst_pad_push (overlay->srcpad, video_frame);
1686 gst_buffer_unref (video_frame);
1687 GST_DEBUG_OBJECT (overlay, "received invalid buffer");
1692 static GstPadLinkReturn
1693 gst_base_text_overlay_text_pad_link (GstPad * pad, GstPad * peer)
1695 GstBaseTextOverlay *overlay;
1697 overlay = GST_BASE_TEXT_OVERLAY (gst_pad_get_parent (pad));
1698 if (G_UNLIKELY (!overlay))
1699 return GST_PAD_LINK_REFUSED;
1701 GST_DEBUG_OBJECT (overlay, "Text pad linked");
1703 overlay->text_linked = TRUE;
1705 gst_object_unref (overlay);
1707 return GST_PAD_LINK_OK;
1711 gst_base_text_overlay_text_pad_unlink (GstPad * pad)
1713 GstBaseTextOverlay *overlay;
1715 /* don't use gst_pad_get_parent() here, will deadlock */
1716 overlay = GST_BASE_TEXT_OVERLAY (GST_PAD_PARENT (pad));
1718 GST_DEBUG_OBJECT (overlay, "Text pad unlinked");
1720 overlay->text_linked = FALSE;
1722 gst_segment_init (&overlay->text_segment, GST_FORMAT_UNDEFINED);
1726 gst_base_text_overlay_text_event (GstPad * pad, GstObject * parent,
1729 gboolean ret = FALSE;
1730 GstBaseTextOverlay *overlay = NULL;
1732 overlay = GST_BASE_TEXT_OVERLAY (parent);
1734 GST_LOG_OBJECT (pad, "received event %s", GST_EVENT_TYPE_NAME (event));
1736 switch (GST_EVENT_TYPE (event)) {
1737 case GST_EVENT_CAPS:
1741 gst_event_parse_caps (event, &caps);
1742 ret = gst_base_text_overlay_setcaps_txt (overlay, caps);
1743 gst_event_unref (event);
1746 case GST_EVENT_SEGMENT:
1748 const GstSegment *segment;
1750 overlay->text_eos = FALSE;
1752 gst_event_parse_segment (event, &segment);
1754 if (segment->format == GST_FORMAT_TIME) {
1755 GST_BASE_TEXT_OVERLAY_LOCK (overlay);
1756 gst_segment_copy_into (segment, &overlay->text_segment);
1757 GST_DEBUG_OBJECT (overlay, "TEXT SEGMENT now: %" GST_SEGMENT_FORMAT,
1758 &overlay->text_segment);
1759 GST_BASE_TEXT_OVERLAY_UNLOCK (overlay);
1761 GST_ELEMENT_WARNING (overlay, STREAM, MUX, (NULL),
1762 ("received non-TIME newsegment event on text input"));
1765 gst_event_unref (event);
1768 /* wake up the video chain, it might be waiting for a text buffer or
1769 * a text segment update */
1770 GST_BASE_TEXT_OVERLAY_LOCK (overlay);
1771 GST_BASE_TEXT_OVERLAY_BROADCAST (overlay);
1772 GST_BASE_TEXT_OVERLAY_UNLOCK (overlay);
1775 case GST_EVENT_FLUSH_STOP:
1776 GST_BASE_TEXT_OVERLAY_LOCK (overlay);
1777 GST_INFO_OBJECT (overlay, "text flush stop");
1778 overlay->text_flushing = FALSE;
1779 overlay->text_eos = FALSE;
1780 gst_base_text_overlay_pop_text (overlay);
1781 gst_segment_init (&overlay->text_segment, GST_FORMAT_TIME);
1782 GST_BASE_TEXT_OVERLAY_UNLOCK (overlay);
1783 gst_event_unref (event);
1786 case GST_EVENT_FLUSH_START:
1787 GST_BASE_TEXT_OVERLAY_LOCK (overlay);
1788 GST_INFO_OBJECT (overlay, "text flush start");
1789 overlay->text_flushing = TRUE;
1790 GST_BASE_TEXT_OVERLAY_BROADCAST (overlay);
1791 GST_BASE_TEXT_OVERLAY_UNLOCK (overlay);
1792 gst_event_unref (event);
1796 GST_BASE_TEXT_OVERLAY_LOCK (overlay);
1797 overlay->text_eos = TRUE;
1798 GST_INFO_OBJECT (overlay, "text EOS");
1799 /* wake up the video chain, it might be waiting for a text buffer or
1800 * a text segment update */
1801 GST_BASE_TEXT_OVERLAY_BROADCAST (overlay);
1802 GST_BASE_TEXT_OVERLAY_UNLOCK (overlay);
1803 gst_event_unref (event);
1807 ret = gst_pad_event_default (pad, parent, event);
1815 gst_base_text_overlay_video_event (GstPad * pad, GstObject * parent,
1818 gboolean ret = FALSE;
1819 GstBaseTextOverlay *overlay = NULL;
1821 overlay = GST_BASE_TEXT_OVERLAY (parent);
1823 GST_DEBUG_OBJECT (pad, "received event %s", GST_EVENT_TYPE_NAME (event));
1825 switch (GST_EVENT_TYPE (event)) {
1826 case GST_EVENT_CAPS:
1830 gst_event_parse_caps (event, &caps);
1831 ret = gst_base_text_overlay_setcaps (overlay, caps);
1832 gst_event_unref (event);
1835 case GST_EVENT_SEGMENT:
1837 const GstSegment *segment;
1839 GST_DEBUG_OBJECT (overlay, "received new segment");
1841 gst_event_parse_segment (event, &segment);
1843 if (segment->format == GST_FORMAT_TIME) {
1844 GST_DEBUG_OBJECT (overlay, "VIDEO SEGMENT now: %" GST_SEGMENT_FORMAT,
1847 gst_segment_copy_into (segment, &overlay->segment);
1849 GST_ELEMENT_WARNING (overlay, STREAM, MUX, (NULL),
1850 ("received non-TIME newsegment event on video input"));
1853 ret = gst_pad_event_default (pad, parent, event);
1857 GST_BASE_TEXT_OVERLAY_LOCK (overlay);
1858 GST_INFO_OBJECT (overlay, "video EOS");
1859 overlay->video_eos = TRUE;
1860 GST_BASE_TEXT_OVERLAY_UNLOCK (overlay);
1861 ret = gst_pad_event_default (pad, parent, event);
1863 case GST_EVENT_FLUSH_START:
1864 GST_BASE_TEXT_OVERLAY_LOCK (overlay);
1865 GST_INFO_OBJECT (overlay, "video flush start");
1866 overlay->video_flushing = TRUE;
1867 GST_BASE_TEXT_OVERLAY_BROADCAST (overlay);
1868 GST_BASE_TEXT_OVERLAY_UNLOCK (overlay);
1869 ret = gst_pad_event_default (pad, parent, event);
1871 case GST_EVENT_FLUSH_STOP:
1872 GST_BASE_TEXT_OVERLAY_LOCK (overlay);
1873 GST_INFO_OBJECT (overlay, "video flush stop");
1874 overlay->video_flushing = FALSE;
1875 overlay->video_eos = FALSE;
1876 gst_segment_init (&overlay->segment, GST_FORMAT_TIME);
1877 GST_BASE_TEXT_OVERLAY_UNLOCK (overlay);
1878 ret = gst_pad_event_default (pad, parent, event);
1881 ret = gst_pad_event_default (pad, parent, event);
1889 gst_base_text_overlay_video_query (GstPad * pad, GstObject * parent,
1892 gboolean ret = FALSE;
1893 GstBaseTextOverlay *overlay;
1895 overlay = GST_BASE_TEXT_OVERLAY (parent);
1897 switch (GST_QUERY_TYPE (query)) {
1898 case GST_QUERY_CAPS:
1900 GstCaps *filter, *caps;
1902 gst_query_parse_caps (query, &filter);
1903 caps = gst_base_text_overlay_getcaps (pad, overlay, filter);
1904 gst_query_set_caps_result (query, caps);
1905 gst_caps_unref (caps);
1910 ret = gst_pad_query_default (pad, parent, query);
1917 /* Called with lock held */
1919 gst_base_text_overlay_pop_text (GstBaseTextOverlay * overlay)
1921 g_return_if_fail (GST_IS_BASE_TEXT_OVERLAY (overlay));
1923 if (overlay->text_buffer) {
1924 GST_DEBUG_OBJECT (overlay, "releasing text buffer %p",
1925 overlay->text_buffer);
1926 gst_buffer_unref (overlay->text_buffer);
1927 overlay->text_buffer = NULL;
1930 /* Let the text task know we used that buffer */
1931 GST_BASE_TEXT_OVERLAY_BROADCAST (overlay);
1934 /* We receive text buffers here. If they are out of segment we just ignore them.
1935 If the buffer is in our segment we keep it internally except if another one
1936 is already waiting here, in that case we wait that it gets kicked out */
1937 static GstFlowReturn
1938 gst_base_text_overlay_text_chain (GstPad * pad, GstObject * parent,
1941 GstFlowReturn ret = GST_FLOW_OK;
1942 GstBaseTextOverlay *overlay = NULL;
1943 gboolean in_seg = FALSE;
1944 guint64 clip_start = 0, clip_stop = 0;
1946 overlay = GST_BASE_TEXT_OVERLAY (parent);
1948 GST_BASE_TEXT_OVERLAY_LOCK (overlay);
1950 if (overlay->text_flushing) {
1951 GST_BASE_TEXT_OVERLAY_UNLOCK (overlay);
1952 ret = GST_FLOW_FLUSHING;
1953 GST_LOG_OBJECT (overlay, "text flushing");
1957 if (overlay->text_eos) {
1958 GST_BASE_TEXT_OVERLAY_UNLOCK (overlay);
1960 GST_LOG_OBJECT (overlay, "text EOS");
1964 GST_LOG_OBJECT (overlay, "%" GST_SEGMENT_FORMAT " BUFFER: ts=%"
1965 GST_TIME_FORMAT ", end=%" GST_TIME_FORMAT, &overlay->segment,
1966 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buffer)),
1967 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buffer) +
1968 GST_BUFFER_DURATION (buffer)));
1970 if (G_LIKELY (GST_BUFFER_TIMESTAMP_IS_VALID (buffer))) {
1973 if (G_LIKELY (GST_BUFFER_DURATION_IS_VALID (buffer)))
1974 stop = GST_BUFFER_TIMESTAMP (buffer) + GST_BUFFER_DURATION (buffer);
1976 stop = GST_CLOCK_TIME_NONE;
1978 in_seg = gst_segment_clip (&overlay->text_segment, GST_FORMAT_TIME,
1979 GST_BUFFER_TIMESTAMP (buffer), stop, &clip_start, &clip_stop);
1985 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer))
1986 GST_BUFFER_TIMESTAMP (buffer) = clip_start;
1987 else if (GST_BUFFER_DURATION_IS_VALID (buffer))
1988 GST_BUFFER_DURATION (buffer) = clip_stop - clip_start;
1990 /* Wait for the previous buffer to go away */
1991 while (overlay->text_buffer != NULL) {
1992 GST_DEBUG ("Pad %s:%s has a buffer queued, waiting",
1993 GST_DEBUG_PAD_NAME (pad));
1994 GST_BASE_TEXT_OVERLAY_WAIT (overlay);
1995 GST_DEBUG ("Pad %s:%s resuming", GST_DEBUG_PAD_NAME (pad));
1996 if (overlay->text_flushing) {
1997 GST_BASE_TEXT_OVERLAY_UNLOCK (overlay);
1998 ret = GST_FLOW_FLUSHING;
2003 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer))
2004 overlay->text_segment.position = clip_start;
2006 overlay->text_buffer = buffer;
2007 /* That's a new text buffer we need to render */
2008 overlay->need_render = TRUE;
2010 /* in case the video chain is waiting for a text buffer, wake it up */
2011 GST_BASE_TEXT_OVERLAY_BROADCAST (overlay);
2014 GST_BASE_TEXT_OVERLAY_UNLOCK (overlay);
2021 static GstFlowReturn
2022 gst_base_text_overlay_video_chain (GstPad * pad, GstObject * parent,
2025 GstBaseTextOverlayClass *klass;
2026 GstBaseTextOverlay *overlay;
2027 GstFlowReturn ret = GST_FLOW_OK;
2028 gboolean in_seg = FALSE;
2029 guint64 start, stop, clip_start = 0, clip_stop = 0;
2032 overlay = GST_BASE_TEXT_OVERLAY (parent);
2033 klass = GST_BASE_TEXT_OVERLAY_GET_CLASS (overlay);
2035 if (!GST_BUFFER_TIMESTAMP_IS_VALID (buffer))
2036 goto missing_timestamp;
2038 /* ignore buffers that are outside of the current segment */
2039 start = GST_BUFFER_TIMESTAMP (buffer);
2041 if (!GST_BUFFER_DURATION_IS_VALID (buffer)) {
2042 stop = GST_CLOCK_TIME_NONE;
2044 stop = start + GST_BUFFER_DURATION (buffer);
2047 GST_LOG_OBJECT (overlay, "%" GST_SEGMENT_FORMAT " BUFFER: ts=%"
2048 GST_TIME_FORMAT ", end=%" GST_TIME_FORMAT, &overlay->segment,
2049 GST_TIME_ARGS (start), GST_TIME_ARGS (stop));
2051 /* segment_clip() will adjust start unconditionally to segment_start if
2052 * no stop time is provided, so handle this ourselves */
2053 if (stop == GST_CLOCK_TIME_NONE && start < overlay->segment.start)
2054 goto out_of_segment;
2056 in_seg = gst_segment_clip (&overlay->segment, GST_FORMAT_TIME, start, stop,
2057 &clip_start, &clip_stop);
2060 goto out_of_segment;
2062 /* if the buffer is only partially in the segment, fix up stamps */
2063 if (clip_start != start || (stop != -1 && clip_stop != stop)) {
2064 GST_DEBUG_OBJECT (overlay, "clipping buffer timestamp/duration to segment");
2065 buffer = gst_buffer_make_writable (buffer);
2066 GST_BUFFER_TIMESTAMP (buffer) = clip_start;
2068 GST_BUFFER_DURATION (buffer) = clip_stop - clip_start;
2071 /* now, after we've done the clipping, fix up end time if there's no
2072 * duration (we only use those estimated values internally though, we
2073 * don't want to set bogus values on the buffer itself) */
2077 gint fps_num, fps_denom;
2079 /* FIXME, store this in setcaps */
2080 caps = gst_pad_get_current_caps (pad);
2081 s = gst_caps_get_structure (caps, 0);
2082 if (gst_structure_get_fraction (s, "framerate", &fps_num, &fps_denom) &&
2083 fps_num && fps_denom) {
2084 GST_DEBUG_OBJECT (overlay, "estimating duration based on framerate");
2085 stop = start + gst_util_uint64_scale_int (GST_SECOND, fps_denom, fps_num);
2087 GST_WARNING_OBJECT (overlay, "no duration, assuming minimal duration");
2088 stop = start + 1; /* we need to assume some interval */
2090 gst_caps_unref (caps);
2093 gst_object_sync_values (GST_OBJECT (overlay), GST_BUFFER_TIMESTAMP (buffer));
2097 GST_BASE_TEXT_OVERLAY_LOCK (overlay);
2099 if (overlay->video_flushing)
2102 if (overlay->video_eos)
2105 if (overlay->silent) {
2106 GST_BASE_TEXT_OVERLAY_UNLOCK (overlay);
2107 ret = gst_pad_push (overlay->srcpad, buffer);
2109 /* Update position */
2110 overlay->segment.position = clip_start;
2115 /* Text pad not linked, rendering internal text */
2116 if (!overlay->text_linked) {
2117 if (klass->get_text) {
2118 text = klass->get_text (overlay, buffer);
2120 text = g_strdup (overlay->default_text);
2123 GST_LOG_OBJECT (overlay, "Text pad not linked, rendering default "
2124 "text: '%s'", GST_STR_NULL (text));
2126 GST_BASE_TEXT_OVERLAY_UNLOCK (overlay);
2128 if (text != NULL && *text != '\0') {
2129 /* Render and push */
2130 gst_base_text_overlay_render_text (overlay, text, -1);
2131 ret = gst_base_text_overlay_push_frame (overlay, buffer);
2133 /* Invalid or empty string */
2134 ret = gst_pad_push (overlay->srcpad, buffer);
2137 /* Text pad linked, check if we have a text buffer queued */
2138 if (overlay->text_buffer) {
2139 gboolean pop_text = FALSE, valid_text_time = TRUE;
2140 GstClockTime text_start = GST_CLOCK_TIME_NONE;
2141 GstClockTime text_end = GST_CLOCK_TIME_NONE;
2142 GstClockTime text_running_time = GST_CLOCK_TIME_NONE;
2143 GstClockTime text_running_time_end = GST_CLOCK_TIME_NONE;
2144 GstClockTime vid_running_time, vid_running_time_end;
2146 /* if the text buffer isn't stamped right, pop it off the
2147 * queue and display it for the current video frame only */
2148 if (!GST_BUFFER_TIMESTAMP_IS_VALID (overlay->text_buffer) ||
2149 !GST_BUFFER_DURATION_IS_VALID (overlay->text_buffer)) {
2150 GST_WARNING_OBJECT (overlay,
2151 "Got text buffer with invalid timestamp or duration");
2153 valid_text_time = FALSE;
2155 text_start = GST_BUFFER_TIMESTAMP (overlay->text_buffer);
2156 text_end = text_start + GST_BUFFER_DURATION (overlay->text_buffer);
2160 gst_segment_to_running_time (&overlay->segment, GST_FORMAT_TIME,
2162 vid_running_time_end =
2163 gst_segment_to_running_time (&overlay->segment, GST_FORMAT_TIME,
2166 /* If timestamp and duration are valid */
2167 if (valid_text_time) {
2169 gst_segment_to_running_time (&overlay->segment, GST_FORMAT_TIME,
2171 text_running_time_end =
2172 gst_segment_to_running_time (&overlay->segment, GST_FORMAT_TIME,
2176 GST_LOG_OBJECT (overlay, "T: %" GST_TIME_FORMAT " - %" GST_TIME_FORMAT,
2177 GST_TIME_ARGS (text_running_time),
2178 GST_TIME_ARGS (text_running_time_end));
2179 GST_LOG_OBJECT (overlay, "V: %" GST_TIME_FORMAT " - %" GST_TIME_FORMAT,
2180 GST_TIME_ARGS (vid_running_time),
2181 GST_TIME_ARGS (vid_running_time_end));
2183 /* Text too old or in the future */
2184 if (valid_text_time && text_running_time_end <= vid_running_time) {
2185 /* text buffer too old, get rid of it and do nothing */
2186 GST_LOG_OBJECT (overlay, "text buffer too old, popping");
2188 gst_base_text_overlay_pop_text (overlay);
2189 GST_BASE_TEXT_OVERLAY_UNLOCK (overlay);
2190 goto wait_for_text_buf;
2191 } else if (valid_text_time && vid_running_time_end <= text_running_time) {
2192 GST_LOG_OBJECT (overlay, "text in future, pushing video buf");
2193 GST_BASE_TEXT_OVERLAY_UNLOCK (overlay);
2194 /* Push the video frame */
2195 ret = gst_pad_push (overlay->srcpad, buffer);
2201 gst_buffer_map (overlay->text_buffer, &map, GST_MAP_READ);
2202 in_text = (gchar *) map.data;
2205 /* g_markup_escape_text() absolutely requires valid UTF8 input, it
2206 * might crash otherwise. We don't fall back on GST_SUBTITLE_ENCODING
2207 * here on purpose, this is something that needs fixing upstream */
2208 if (!g_utf8_validate (in_text, in_size, NULL)) {
2209 const gchar *end = NULL;
2211 GST_WARNING_OBJECT (overlay, "received invalid UTF-8");
2212 in_text = g_strndup (in_text, in_size);
2213 while (!g_utf8_validate (in_text, in_size, &end) && end)
2214 *((gchar *) end) = '*';
2217 /* Get the string */
2218 if (overlay->have_pango_markup) {
2219 text = g_strndup (in_text, in_size);
2221 text = g_markup_escape_text (in_text, in_size);
2224 if (text != NULL && *text != '\0') {
2225 gint text_len = strlen (text);
2227 while (text_len > 0 && (text[text_len - 1] == '\n' ||
2228 text[text_len - 1] == '\r')) {
2231 GST_DEBUG_OBJECT (overlay, "Rendering text '%*s'", text_len, text);
2232 gst_base_text_overlay_render_text (overlay, text, text_len);
2234 GST_DEBUG_OBJECT (overlay, "No text to render (empty buffer)");
2235 gst_base_text_overlay_render_text (overlay, " ", 1);
2237 if (in_text != (gchar *) map.data)
2240 gst_buffer_unmap (overlay->text_buffer, &map);
2242 GST_BASE_TEXT_OVERLAY_UNLOCK (overlay);
2243 ret = gst_base_text_overlay_push_frame (overlay, buffer);
2245 if (valid_text_time && text_running_time_end <= vid_running_time_end) {
2246 GST_LOG_OBJECT (overlay, "text buffer not needed any longer");
2251 GST_BASE_TEXT_OVERLAY_LOCK (overlay);
2252 gst_base_text_overlay_pop_text (overlay);
2253 GST_BASE_TEXT_OVERLAY_UNLOCK (overlay);
2256 gboolean wait_for_text_buf = TRUE;
2258 if (overlay->text_eos)
2259 wait_for_text_buf = FALSE;
2261 if (!overlay->wait_text)
2262 wait_for_text_buf = FALSE;
2264 /* Text pad linked, but no text buffer available - what now? */
2265 if (overlay->text_segment.format == GST_FORMAT_TIME) {
2266 GstClockTime text_start_running_time, text_position_running_time;
2267 GstClockTime vid_running_time;
2270 gst_segment_to_running_time (&overlay->segment, GST_FORMAT_TIME,
2271 GST_BUFFER_TIMESTAMP (buffer));
2272 text_start_running_time =
2273 gst_segment_to_running_time (&overlay->text_segment,
2274 GST_FORMAT_TIME, overlay->text_segment.start);
2275 text_position_running_time =
2276 gst_segment_to_running_time (&overlay->text_segment,
2277 GST_FORMAT_TIME, overlay->text_segment.position);
2279 if ((GST_CLOCK_TIME_IS_VALID (text_start_running_time) &&
2280 vid_running_time < text_start_running_time) ||
2281 (GST_CLOCK_TIME_IS_VALID (text_position_running_time) &&
2282 vid_running_time < text_position_running_time)) {
2283 wait_for_text_buf = FALSE;
2287 if (wait_for_text_buf) {
2288 GST_DEBUG_OBJECT (overlay, "no text buffer, need to wait for one");
2289 GST_BASE_TEXT_OVERLAY_WAIT (overlay);
2290 GST_DEBUG_OBJECT (overlay, "resuming");
2291 GST_BASE_TEXT_OVERLAY_UNLOCK (overlay);
2292 goto wait_for_text_buf;
2294 GST_BASE_TEXT_OVERLAY_UNLOCK (overlay);
2295 GST_LOG_OBJECT (overlay, "no need to wait for a text buffer");
2296 ret = gst_pad_push (overlay->srcpad, buffer);
2303 /* Update position */
2304 overlay->segment.position = clip_start;
2310 GST_WARNING_OBJECT (overlay, "buffer without timestamp, discarding");
2311 gst_buffer_unref (buffer);
2317 GST_BASE_TEXT_OVERLAY_UNLOCK (overlay);
2318 GST_DEBUG_OBJECT (overlay, "flushing, discarding buffer");
2319 gst_buffer_unref (buffer);
2320 return GST_FLOW_FLUSHING;
2324 GST_BASE_TEXT_OVERLAY_UNLOCK (overlay);
2325 GST_DEBUG_OBJECT (overlay, "eos, discarding buffer");
2326 gst_buffer_unref (buffer);
2327 return GST_FLOW_EOS;
2331 GST_DEBUG_OBJECT (overlay, "buffer out of segment, discarding");
2332 gst_buffer_unref (buffer);
2337 static GstStateChangeReturn
2338 gst_base_text_overlay_change_state (GstElement * element,
2339 GstStateChange transition)
2341 GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
2342 GstBaseTextOverlay *overlay = GST_BASE_TEXT_OVERLAY (element);
2344 switch (transition) {
2345 case GST_STATE_CHANGE_PAUSED_TO_READY:
2346 GST_BASE_TEXT_OVERLAY_LOCK (overlay);
2347 overlay->text_flushing = TRUE;
2348 overlay->video_flushing = TRUE;
2349 /* pop_text will broadcast on the GCond and thus also make the video
2350 * chain exit if it's waiting for a text buffer */
2351 gst_base_text_overlay_pop_text (overlay);
2352 GST_BASE_TEXT_OVERLAY_UNLOCK (overlay);
2358 ret = parent_class->change_state (element, transition);
2359 if (ret == GST_STATE_CHANGE_FAILURE)
2362 switch (transition) {
2363 case GST_STATE_CHANGE_READY_TO_PAUSED:
2364 GST_BASE_TEXT_OVERLAY_LOCK (overlay);
2365 overlay->text_flushing = FALSE;
2366 overlay->video_flushing = FALSE;
2367 overlay->video_eos = FALSE;
2368 overlay->text_eos = FALSE;
2369 gst_segment_init (&overlay->segment, GST_FORMAT_TIME);
2370 gst_segment_init (&overlay->text_segment, GST_FORMAT_TIME);
2371 GST_BASE_TEXT_OVERLAY_UNLOCK (overlay);
2381 plugin_init (GstPlugin * plugin)
2383 if (!gst_element_register (plugin, "textoverlay", GST_RANK_NONE,
2384 GST_TYPE_TEXT_OVERLAY) ||
2385 !gst_element_register (plugin, "timeoverlay", GST_RANK_NONE,
2386 GST_TYPE_TIME_OVERLAY) ||
2387 !gst_element_register (plugin, "clockoverlay", GST_RANK_NONE,
2388 GST_TYPE_CLOCK_OVERLAY) ||
2389 !gst_element_register (plugin, "textrender", GST_RANK_NONE,
2390 GST_TYPE_TEXT_RENDER)) {
2394 /*texttestsrc_plugin_init(module, plugin); */
2396 GST_DEBUG_CATEGORY_INIT (pango_debug, "pango", 0, "Pango elements");
2401 GST_PLUGIN_DEFINE (GST_VERSION_MAJOR, GST_VERSION_MINOR,
2402 pango, "Pango-based text rendering and overlay", plugin_init,
2403 VERSION, GST_LICENSE, GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)