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., 51 Franklin St, Fifth Floor,
22 * Boston, MA 02110-1301, 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>
79 #include <gst/video/gstvideometa.h>
81 #include "gstbasetextoverlay.h"
82 #include "gsttextoverlay.h"
83 #include "gsttimeoverlay.h"
84 #include "gstclockoverlay.h"
85 #include "gsttextrender.h"
89 * - use proper strides and offset for I420
90 * - if text is wider than the video picture, it does not get
91 * clipped properly during blitting (if wrapping is disabled)
92 * - make 'shading_value' a property (or enum: light/normal/dark/verydark)?
95 GST_DEBUG_CATEGORY (pango_debug);
96 #define GST_CAT_DEFAULT pango_debug
98 #define DEFAULT_PROP_TEXT ""
99 #define DEFAULT_PROP_SHADING FALSE
100 #define DEFAULT_PROP_VALIGNMENT GST_BASE_TEXT_OVERLAY_VALIGN_BASELINE
101 #define DEFAULT_PROP_HALIGNMENT GST_BASE_TEXT_OVERLAY_HALIGN_CENTER
102 #define DEFAULT_PROP_XPAD 25
103 #define DEFAULT_PROP_YPAD 25
104 #define DEFAULT_PROP_DELTAX 0
105 #define DEFAULT_PROP_DELTAY 0
106 #define DEFAULT_PROP_XPOS 0.5
107 #define DEFAULT_PROP_YPOS 0.5
108 #define DEFAULT_PROP_WRAP_MODE GST_BASE_TEXT_OVERLAY_WRAP_MODE_WORD_CHAR
109 #define DEFAULT_PROP_FONT_DESC ""
110 #define DEFAULT_PROP_SILENT FALSE
111 #define DEFAULT_PROP_LINE_ALIGNMENT GST_BASE_TEXT_OVERLAY_LINE_ALIGN_CENTER
112 #define DEFAULT_PROP_WAIT_TEXT TRUE
113 #define DEFAULT_PROP_AUTO_ADJUST_SIZE TRUE
114 #define DEFAULT_PROP_VERTICAL_RENDER FALSE
115 #define DEFAULT_PROP_COLOR 0xffffffff
116 #define DEFAULT_PROP_OUTLINE_COLOR 0xff000000
118 /* make a property of me */
119 #define DEFAULT_SHADING_VALUE -80
121 #define MINIMUM_OUTLINE_OFFSET 1.0
122 #define DEFAULT_SCALE_BASIS 640
124 #define COMP_Y(ret, r, g, b) \
126 ret = (int) (((19595 * r) >> 16) + ((38470 * g) >> 16) + ((7471 * b) >> 16)); \
127 ret = CLAMP (ret, 0, 255); \
130 #define COMP_U(ret, r, g, b) \
132 ret = (int) (-((11059 * r) >> 16) - ((21709 * g) >> 16) + ((32768 * b) >> 16) + 128); \
133 ret = CLAMP (ret, 0, 255); \
136 #define COMP_V(ret, r, g, b) \
138 ret = (int) (((32768 * r) >> 16) - ((27439 * g) >> 16) - ((5329 * b) >> 16) + 128); \
139 ret = CLAMP (ret, 0, 255); \
142 #define BLEND(ret, alpha, v0, v1) \
144 ret = (v0 * alpha + v1 * (255 - alpha)) / 255; \
147 #define OVER(ret, alphaA, Ca, alphaB, Cb, alphaNew) \
150 _tmp = (Ca * alphaA + Cb * alphaB * (255 - alphaA) / 255) / alphaNew; \
151 ret = CLAMP (_tmp, 0, 255); \
154 #if G_BYTE_ORDER == G_LITTLE_ENDIAN
155 # define CAIRO_ARGB_A 3
156 # define CAIRO_ARGB_R 2
157 # define CAIRO_ARGB_G 1
158 # define CAIRO_ARGB_B 0
160 # define CAIRO_ARGB_A 0
161 # define CAIRO_ARGB_R 1
162 # define CAIRO_ARGB_G 2
163 # define CAIRO_ARGB_B 3
184 PROP_AUTO_ADJUST_SIZE,
185 PROP_VERTICAL_RENDER,
192 /* FIXME: video-blend.c doesn't support formats with more than 8 bit per
193 * component (which get unpacked into ARGB64 or AYUV64) yet, such as:
194 * v210, v216, UYVP, GRAY16_LE, GRAY16_BE */
195 #define VIDEO_FORMATS "{ BGRx, RGBx, xRGB, xBGR, RGBA, BGRA, ARGB, ABGR, RGB, BGR, \
196 I420, YV12, AYUV, YUY2, UYVY, v308, Y41B, Y42B, Y444, \
197 NV12, NV21, A420, YUV9, YVU9, IYU1, GRAY8 }"
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,
338 GstObject * parent, GstPad * peer);
339 static void gst_base_text_overlay_text_pad_unlink (GstPad * pad,
341 static void gst_base_text_overlay_pop_text (GstBaseTextOverlay * overlay);
342 static void gst_base_text_overlay_update_render_mode (GstBaseTextOverlay *
345 static void gst_base_text_overlay_finalize (GObject * object);
346 static void gst_base_text_overlay_set_property (GObject * object, guint prop_id,
347 const GValue * value, GParamSpec * pspec);
348 static void gst_base_text_overlay_get_property (GObject * object, guint prop_id,
349 GValue * value, GParamSpec * pspec);
351 gst_base_text_overlay_adjust_values_with_fontdesc (GstBaseTextOverlay * overlay,
352 PangoFontDescription * desc);
355 gst_base_text_overlay_get_type (void)
357 static GType type = 0;
359 if (g_once_init_enter ((gsize *) & type)) {
360 static const GTypeInfo info = {
361 sizeof (GstBaseTextOverlayClass),
362 (GBaseInitFunc) gst_base_text_overlay_base_init,
364 (GClassInitFunc) gst_base_text_overlay_class_init,
367 sizeof (GstBaseTextOverlay),
369 (GInstanceInitFunc) gst_base_text_overlay_init,
372 g_once_init_leave ((gsize *) & type,
373 g_type_register_static (GST_TYPE_ELEMENT, "GstBaseTextOverlay", &info,
381 gst_base_text_overlay_get_text (GstBaseTextOverlay * overlay,
382 GstBuffer * video_frame)
384 return g_strdup (overlay->default_text);
388 gst_base_text_overlay_base_init (gpointer g_class)
390 GstBaseTextOverlayClass *klass = GST_BASE_TEXT_OVERLAY_CLASS (g_class);
391 PangoFontMap *fontmap;
393 /* Only lock for the subclasses here, the base class
394 * doesn't have this mutex yet and it's not necessary
396 if (klass->pango_lock)
397 g_mutex_lock (klass->pango_lock);
398 fontmap = pango_cairo_font_map_get_default ();
399 klass->pango_context =
400 pango_font_map_create_context (PANGO_FONT_MAP (fontmap));
401 if (klass->pango_lock)
402 g_mutex_unlock (klass->pango_lock);
406 gst_base_text_overlay_class_init (GstBaseTextOverlayClass * klass)
408 GObjectClass *gobject_class;
409 GstElementClass *gstelement_class;
411 gobject_class = (GObjectClass *) klass;
412 gstelement_class = (GstElementClass *) klass;
414 parent_class = g_type_class_peek_parent (klass);
416 gobject_class->finalize = gst_base_text_overlay_finalize;
417 gobject_class->set_property = gst_base_text_overlay_set_property;
418 gobject_class->get_property = gst_base_text_overlay_get_property;
420 gst_element_class_add_pad_template (gstelement_class,
421 gst_static_pad_template_get (&src_template_factory));
422 gst_element_class_add_pad_template (gstelement_class,
423 gst_static_pad_template_get (&video_sink_template_factory));
425 gstelement_class->change_state =
426 GST_DEBUG_FUNCPTR (gst_base_text_overlay_change_state);
428 klass->pango_lock = g_slice_new (GMutex);
429 g_mutex_init (klass->pango_lock);
431 klass->get_text = gst_base_text_overlay_get_text;
433 g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_TEXT,
434 g_param_spec_string ("text", "text",
435 "Text to be display.", DEFAULT_PROP_TEXT,
436 G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
437 g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_SHADING,
438 g_param_spec_boolean ("shaded-background", "shaded background",
439 "Whether to shade the background under the text area",
440 DEFAULT_PROP_SHADING, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
441 g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_VALIGNMENT,
442 g_param_spec_enum ("valignment", "vertical alignment",
443 "Vertical alignment of the text", GST_TYPE_BASE_TEXT_OVERLAY_VALIGN,
444 DEFAULT_PROP_VALIGNMENT, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
445 g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_HALIGNMENT,
446 g_param_spec_enum ("halignment", "horizontal alignment",
447 "Horizontal alignment of the text", GST_TYPE_BASE_TEXT_OVERLAY_HALIGN,
448 DEFAULT_PROP_HALIGNMENT, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
449 g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_XPAD,
450 g_param_spec_int ("xpad", "horizontal paddding",
451 "Horizontal paddding when using left/right alignment", 0, G_MAXINT,
452 DEFAULT_PROP_XPAD, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
453 g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_YPAD,
454 g_param_spec_int ("ypad", "vertical padding",
455 "Vertical padding when using top/bottom alignment", 0, G_MAXINT,
456 DEFAULT_PROP_YPAD, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
457 g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_DELTAX,
458 g_param_spec_int ("deltax", "X position modifier",
459 "Shift X position to the left or to the right. Unit is pixels.",
460 G_MININT, G_MAXINT, DEFAULT_PROP_DELTAX,
461 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
462 g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_DELTAY,
463 g_param_spec_int ("deltay", "Y position modifier",
464 "Shift Y position up or down. Unit is pixels.", G_MININT, G_MAXINT,
465 DEFAULT_PROP_DELTAY, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
467 * GstBaseTextOverlay:xpos
469 * Horizontal position of the rendered text when using positioned alignment.
473 g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_XPOS,
474 g_param_spec_double ("xpos", "horizontal position",
475 "Horizontal position when using position alignment", 0, 1.0,
477 G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
479 * GstBaseTextOverlay:ypos
481 * Vertical position of the rendered text when using positioned alignment.
485 g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_YPOS,
486 g_param_spec_double ("ypos", "vertical position",
487 "Vertical position when using position alignment", 0, 1.0,
489 G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
490 g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_WRAP_MODE,
491 g_param_spec_enum ("wrap-mode", "wrap mode",
492 "Whether to wrap the text and if so how.",
493 GST_TYPE_BASE_TEXT_OVERLAY_WRAP_MODE, DEFAULT_PROP_WRAP_MODE,
494 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
495 g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_FONT_DESC,
496 g_param_spec_string ("font-desc", "font description",
497 "Pango font description of font to be used for rendering. "
498 "See documentation of pango_font_description_from_string "
499 "for syntax.", DEFAULT_PROP_FONT_DESC,
500 G_PARAM_WRITABLE | G_PARAM_STATIC_STRINGS));
502 * GstBaseTextOverlay:color
504 * Color of the rendered text.
508 g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_COLOR,
509 g_param_spec_uint ("color", "Color",
510 "Color to use for text (big-endian ARGB).", 0, G_MAXUINT32,
512 G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
514 * GstTextOverlay:outline-color
516 * Color of the outline of the rendered text.
520 g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_OUTLINE_COLOR,
521 g_param_spec_uint ("outline-color", "Text Outline Color",
522 "Color to use for outline the text (big-endian ARGB).", 0,
523 G_MAXUINT32, DEFAULT_PROP_OUTLINE_COLOR,
524 G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
527 * GstBaseTextOverlay:line-alignment
529 * Alignment of text lines relative to each other (for multi-line text)
533 g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_LINE_ALIGNMENT,
534 g_param_spec_enum ("line-alignment", "line alignment",
535 "Alignment of text lines relative to each other.",
536 GST_TYPE_BASE_TEXT_OVERLAY_LINE_ALIGN, DEFAULT_PROP_LINE_ALIGNMENT,
537 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
539 * GstBaseTextOverlay:silent
541 * If set, no text is rendered. Useful to switch off text rendering
542 * temporarily without removing the textoverlay element from the pipeline.
546 /* FIXME 0.11: rename to "visible" or "text-visible" or "render-text" */
547 g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_SILENT,
548 g_param_spec_boolean ("silent", "silent",
549 "Whether to render the text string",
551 G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
553 * GstBaseTextOverlay:wait-text
555 * If set, the video will block until a subtitle is received on the text pad.
556 * If video and subtitles are sent in sync, like from the same demuxer, this
557 * property should be set.
561 g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_WAIT_TEXT,
562 g_param_spec_boolean ("wait-text", "Wait Text",
563 "Whether to wait for subtitles",
564 DEFAULT_PROP_WAIT_TEXT, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
566 g_object_class_install_property (G_OBJECT_CLASS (klass),
567 PROP_AUTO_ADJUST_SIZE, g_param_spec_boolean ("auto-resize", "auto resize",
568 "Automatically adjust font size to screen-size.",
569 DEFAULT_PROP_AUTO_ADJUST_SIZE,
570 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
572 g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_VERTICAL_RENDER,
573 g_param_spec_boolean ("vertical-render", "vertical render",
574 "Vertical Render.", DEFAULT_PROP_VERTICAL_RENDER,
575 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
579 gst_base_text_overlay_finalize (GObject * object)
581 GstBaseTextOverlay *overlay = GST_BASE_TEXT_OVERLAY (object);
583 g_free (overlay->default_text);
585 if (overlay->composition) {
586 gst_video_overlay_composition_unref (overlay->composition);
587 overlay->composition = NULL;
590 if (overlay->text_image) {
591 gst_buffer_unref (overlay->text_image);
592 overlay->text_image = NULL;
595 if (overlay->layout) {
596 g_object_unref (overlay->layout);
597 overlay->layout = NULL;
600 if (overlay->text_buffer) {
601 gst_buffer_unref (overlay->text_buffer);
602 overlay->text_buffer = NULL;
605 g_mutex_clear (&overlay->lock);
606 g_cond_clear (&overlay->cond);
608 G_OBJECT_CLASS (parent_class)->finalize (object);
612 gst_base_text_overlay_init (GstBaseTextOverlay * overlay,
613 GstBaseTextOverlayClass * klass)
615 GstPadTemplate *template;
616 PangoFontDescription *desc;
619 template = gst_static_pad_template_get (&video_sink_template_factory);
620 overlay->video_sinkpad = gst_pad_new_from_template (template, "video_sink");
621 gst_object_unref (template);
622 gst_pad_set_event_function (overlay->video_sinkpad,
623 GST_DEBUG_FUNCPTR (gst_base_text_overlay_video_event));
624 gst_pad_set_chain_function (overlay->video_sinkpad,
625 GST_DEBUG_FUNCPTR (gst_base_text_overlay_video_chain));
626 gst_pad_set_query_function (overlay->video_sinkpad,
627 GST_DEBUG_FUNCPTR (gst_base_text_overlay_video_query));
628 GST_PAD_SET_PROXY_ALLOCATION (overlay->video_sinkpad);
629 gst_element_add_pad (GST_ELEMENT (overlay), overlay->video_sinkpad);
632 gst_element_class_get_pad_template (GST_ELEMENT_CLASS (klass),
636 overlay->text_sinkpad = gst_pad_new_from_template (template, "text_sink");
638 gst_pad_set_event_function (overlay->text_sinkpad,
639 GST_DEBUG_FUNCPTR (gst_base_text_overlay_text_event));
640 gst_pad_set_chain_function (overlay->text_sinkpad,
641 GST_DEBUG_FUNCPTR (gst_base_text_overlay_text_chain));
642 gst_pad_set_link_function (overlay->text_sinkpad,
643 GST_DEBUG_FUNCPTR (gst_base_text_overlay_text_pad_link));
644 gst_pad_set_unlink_function (overlay->text_sinkpad,
645 GST_DEBUG_FUNCPTR (gst_base_text_overlay_text_pad_unlink));
646 gst_element_add_pad (GST_ELEMENT (overlay), overlay->text_sinkpad);
650 template = gst_static_pad_template_get (&src_template_factory);
651 overlay->srcpad = gst_pad_new_from_template (template, "src");
652 gst_object_unref (template);
653 gst_pad_set_event_function (overlay->srcpad,
654 GST_DEBUG_FUNCPTR (gst_base_text_overlay_src_event));
655 gst_pad_set_query_function (overlay->srcpad,
656 GST_DEBUG_FUNCPTR (gst_base_text_overlay_src_query));
657 gst_element_add_pad (GST_ELEMENT (overlay), overlay->srcpad);
659 g_mutex_lock (GST_BASE_TEXT_OVERLAY_GET_CLASS (overlay)->pango_lock);
660 overlay->line_align = DEFAULT_PROP_LINE_ALIGNMENT;
662 pango_layout_new (GST_BASE_TEXT_OVERLAY_GET_CLASS
663 (overlay)->pango_context);
665 pango_context_get_font_description (GST_BASE_TEXT_OVERLAY_GET_CLASS
666 (overlay)->pango_context);
667 gst_base_text_overlay_adjust_values_with_fontdesc (overlay, desc);
669 overlay->color = DEFAULT_PROP_COLOR;
670 overlay->outline_color = DEFAULT_PROP_OUTLINE_COLOR;
671 overlay->halign = DEFAULT_PROP_HALIGNMENT;
672 overlay->valign = DEFAULT_PROP_VALIGNMENT;
673 overlay->xpad = DEFAULT_PROP_XPAD;
674 overlay->ypad = DEFAULT_PROP_YPAD;
675 overlay->deltax = DEFAULT_PROP_DELTAX;
676 overlay->deltay = DEFAULT_PROP_DELTAY;
677 overlay->xpos = DEFAULT_PROP_XPOS;
678 overlay->ypos = DEFAULT_PROP_YPOS;
680 overlay->wrap_mode = DEFAULT_PROP_WRAP_MODE;
682 overlay->want_shading = DEFAULT_PROP_SHADING;
683 overlay->shading_value = DEFAULT_SHADING_VALUE;
684 overlay->silent = DEFAULT_PROP_SILENT;
685 overlay->wait_text = DEFAULT_PROP_WAIT_TEXT;
686 overlay->auto_adjust_size = DEFAULT_PROP_AUTO_ADJUST_SIZE;
688 overlay->default_text = g_strdup (DEFAULT_PROP_TEXT);
689 overlay->need_render = TRUE;
690 overlay->text_image = NULL;
691 overlay->use_vertical_render = DEFAULT_PROP_VERTICAL_RENDER;
692 gst_base_text_overlay_update_render_mode (overlay);
694 overlay->text_buffer = NULL;
695 overlay->text_linked = FALSE;
696 g_mutex_init (&overlay->lock);
697 g_cond_init (&overlay->cond);
698 gst_segment_init (&overlay->segment, GST_FORMAT_TIME);
699 g_mutex_unlock (GST_BASE_TEXT_OVERLAY_GET_CLASS (overlay)->pango_lock);
703 gst_base_text_overlay_update_wrap_mode (GstBaseTextOverlay * overlay)
705 if (overlay->wrap_mode == GST_BASE_TEXT_OVERLAY_WRAP_MODE_NONE) {
706 GST_DEBUG_OBJECT (overlay, "Set wrap mode NONE");
707 pango_layout_set_width (overlay->layout, -1);
711 if (overlay->auto_adjust_size) {
712 width = DEFAULT_SCALE_BASIS * PANGO_SCALE;
713 if (overlay->use_vertical_render) {
714 width = width * (overlay->height - overlay->ypad * 2) / overlay->width;
718 (overlay->use_vertical_render ? overlay->height : overlay->width) *
722 GST_DEBUG_OBJECT (overlay, "Set layout width %d", overlay->width);
723 GST_DEBUG_OBJECT (overlay, "Set wrap mode %d", overlay->wrap_mode);
724 pango_layout_set_width (overlay->layout, width);
725 pango_layout_set_wrap (overlay->layout, (PangoWrapMode) overlay->wrap_mode);
730 gst_base_text_overlay_update_render_mode (GstBaseTextOverlay * overlay)
732 PangoMatrix matrix = PANGO_MATRIX_INIT;
733 PangoContext *context = pango_layout_get_context (overlay->layout);
735 if (overlay->use_vertical_render) {
736 pango_matrix_rotate (&matrix, -90);
737 pango_context_set_base_gravity (context, PANGO_GRAVITY_AUTO);
738 pango_context_set_matrix (context, &matrix);
739 pango_layout_set_alignment (overlay->layout, PANGO_ALIGN_LEFT);
741 pango_context_set_base_gravity (context, PANGO_GRAVITY_SOUTH);
742 pango_context_set_matrix (context, &matrix);
743 pango_layout_set_alignment (overlay->layout,
744 (PangoAlignment) overlay->line_align);
749 gst_base_text_overlay_setcaps_txt (GstBaseTextOverlay * overlay, GstCaps * caps)
751 GstStructure *structure;
754 structure = gst_caps_get_structure (caps, 0);
755 format = gst_structure_get_string (structure, "format");
756 overlay->have_pango_markup = (strcmp (format, "pango-markup") == 0);
761 /* FIXME: upstream nego (e.g. when the video window is resized) */
763 /* only negotiate/query video overlay composition support for now */
765 gst_base_text_overlay_negotiate (GstBaseTextOverlay * overlay)
769 gboolean attach = FALSE;
771 GST_DEBUG_OBJECT (overlay, "performing negotiation");
773 target = gst_pad_get_current_caps (overlay->srcpad);
775 if (!target || gst_caps_is_empty (target))
778 /* find supported meta */
779 query = gst_query_new_allocation (target, TRUE);
781 if (!gst_pad_peer_query (overlay->srcpad, query)) {
782 /* no problem, we use the query defaults */
783 GST_DEBUG_OBJECT (overlay, "ALLOCATION query failed");
786 if (gst_query_find_allocation_meta (query,
787 GST_VIDEO_OVERLAY_COMPOSITION_META_API_TYPE, NULL))
790 overlay->attach_compo_to_buffer = attach;
792 gst_query_unref (query);
793 gst_caps_unref (target);
800 gst_caps_unref (target);
806 gst_base_text_overlay_setcaps (GstBaseTextOverlay * overlay, GstCaps * caps)
809 gboolean ret = FALSE;
811 if (!gst_video_info_from_caps (&info, caps))
814 overlay->info = info;
815 overlay->format = GST_VIDEO_INFO_FORMAT (&info);
816 overlay->width = GST_VIDEO_INFO_WIDTH (&info);
817 overlay->height = GST_VIDEO_INFO_HEIGHT (&info);
819 ret = gst_pad_set_caps (overlay->srcpad, caps);
822 GST_BASE_TEXT_OVERLAY_LOCK (overlay);
823 g_mutex_lock (GST_BASE_TEXT_OVERLAY_GET_CLASS (overlay)->pango_lock);
824 gst_base_text_overlay_negotiate (overlay);
825 gst_base_text_overlay_update_wrap_mode (overlay);
826 g_mutex_unlock (GST_BASE_TEXT_OVERLAY_GET_CLASS (overlay)->pango_lock);
827 GST_BASE_TEXT_OVERLAY_UNLOCK (overlay);
835 GST_DEBUG_OBJECT (overlay, "could not parse caps");
841 gst_base_text_overlay_set_property (GObject * object, guint prop_id,
842 const GValue * value, GParamSpec * pspec)
844 GstBaseTextOverlay *overlay = GST_BASE_TEXT_OVERLAY (object);
846 GST_BASE_TEXT_OVERLAY_LOCK (overlay);
849 g_free (overlay->default_text);
850 overlay->default_text = g_value_dup_string (value);
851 overlay->need_render = TRUE;
854 overlay->want_shading = g_value_get_boolean (value);
857 overlay->xpad = g_value_get_int (value);
860 overlay->ypad = g_value_get_int (value);
863 overlay->deltax = g_value_get_int (value);
866 overlay->deltay = g_value_get_int (value);
869 overlay->xpos = g_value_get_double (value);
872 overlay->ypos = g_value_get_double (value);
874 case PROP_VALIGNMENT:
875 overlay->valign = g_value_get_enum (value);
877 case PROP_HALIGNMENT:
878 overlay->halign = g_value_get_enum (value);
881 overlay->wrap_mode = g_value_get_enum (value);
882 g_mutex_lock (GST_BASE_TEXT_OVERLAY_GET_CLASS (overlay)->pango_lock);
883 gst_base_text_overlay_update_wrap_mode (overlay);
884 g_mutex_unlock (GST_BASE_TEXT_OVERLAY_GET_CLASS (overlay)->pango_lock);
888 PangoFontDescription *desc;
889 const gchar *fontdesc_str;
891 fontdesc_str = g_value_get_string (value);
892 g_mutex_lock (GST_BASE_TEXT_OVERLAY_GET_CLASS (overlay)->pango_lock);
893 desc = pango_font_description_from_string (fontdesc_str);
895 GST_LOG_OBJECT (overlay, "font description set: %s", fontdesc_str);
896 pango_layout_set_font_description (overlay->layout, desc);
897 gst_base_text_overlay_adjust_values_with_fontdesc (overlay, desc);
898 pango_font_description_free (desc);
900 GST_WARNING_OBJECT (overlay, "font description parse failed: %s",
903 g_mutex_unlock (GST_BASE_TEXT_OVERLAY_GET_CLASS (overlay)->pango_lock);
907 overlay->color = g_value_get_uint (value);
909 case PROP_OUTLINE_COLOR:
910 overlay->outline_color = g_value_get_uint (value);
913 overlay->silent = g_value_get_boolean (value);
915 case PROP_LINE_ALIGNMENT:
916 overlay->line_align = g_value_get_enum (value);
917 g_mutex_lock (GST_BASE_TEXT_OVERLAY_GET_CLASS (overlay)->pango_lock);
918 pango_layout_set_alignment (overlay->layout,
919 (PangoAlignment) overlay->line_align);
920 g_mutex_unlock (GST_BASE_TEXT_OVERLAY_GET_CLASS (overlay)->pango_lock);
923 overlay->wait_text = g_value_get_boolean (value);
925 case PROP_AUTO_ADJUST_SIZE:
926 overlay->auto_adjust_size = g_value_get_boolean (value);
927 overlay->need_render = TRUE;
929 case PROP_VERTICAL_RENDER:
930 overlay->use_vertical_render = g_value_get_boolean (value);
931 g_mutex_lock (GST_BASE_TEXT_OVERLAY_GET_CLASS (overlay)->pango_lock);
932 gst_base_text_overlay_update_render_mode (overlay);
933 g_mutex_unlock (GST_BASE_TEXT_OVERLAY_GET_CLASS (overlay)->pango_lock);
934 overlay->need_render = TRUE;
937 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
941 overlay->need_render = TRUE;
942 GST_BASE_TEXT_OVERLAY_UNLOCK (overlay);
946 gst_base_text_overlay_get_property (GObject * object, guint prop_id,
947 GValue * value, GParamSpec * pspec)
949 GstBaseTextOverlay *overlay = GST_BASE_TEXT_OVERLAY (object);
951 GST_BASE_TEXT_OVERLAY_LOCK (overlay);
954 g_value_set_string (value, overlay->default_text);
957 g_value_set_boolean (value, overlay->want_shading);
960 g_value_set_int (value, overlay->xpad);
963 g_value_set_int (value, overlay->ypad);
966 g_value_set_int (value, overlay->deltax);
969 g_value_set_int (value, overlay->deltay);
972 g_value_set_double (value, overlay->xpos);
975 g_value_set_double (value, overlay->ypos);
977 case PROP_VALIGNMENT:
978 g_value_set_enum (value, overlay->valign);
980 case PROP_HALIGNMENT:
981 g_value_set_enum (value, overlay->halign);
984 g_value_set_enum (value, overlay->wrap_mode);
987 g_value_set_boolean (value, overlay->silent);
989 case PROP_LINE_ALIGNMENT:
990 g_value_set_enum (value, overlay->line_align);
993 g_value_set_boolean (value, overlay->wait_text);
995 case PROP_AUTO_ADJUST_SIZE:
996 g_value_set_boolean (value, overlay->auto_adjust_size);
998 case PROP_VERTICAL_RENDER:
999 g_value_set_boolean (value, overlay->use_vertical_render);
1002 g_value_set_uint (value, overlay->color);
1004 case PROP_OUTLINE_COLOR:
1005 g_value_set_uint (value, overlay->outline_color);
1008 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
1012 overlay->need_render = TRUE;
1013 GST_BASE_TEXT_OVERLAY_UNLOCK (overlay);
1017 gst_base_text_overlay_src_query (GstPad * pad, GstObject * parent,
1020 gboolean ret = FALSE;
1021 GstBaseTextOverlay *overlay;
1023 overlay = GST_BASE_TEXT_OVERLAY (parent);
1025 switch (GST_QUERY_TYPE (query)) {
1026 case GST_QUERY_CAPS:
1028 GstCaps *filter, *caps;
1030 gst_query_parse_caps (query, &filter);
1031 caps = gst_base_text_overlay_getcaps (pad, overlay, filter);
1032 gst_query_set_caps_result (query, caps);
1033 gst_caps_unref (caps);
1038 ret = gst_pad_peer_query (overlay->video_sinkpad, query);
1046 gst_base_text_overlay_src_event (GstPad * pad, GstObject * parent,
1049 gboolean ret = FALSE;
1050 GstBaseTextOverlay *overlay = NULL;
1052 overlay = GST_BASE_TEXT_OVERLAY (parent);
1054 switch (GST_EVENT_TYPE (event)) {
1055 case GST_EVENT_SEEK:{
1058 /* We don't handle seek if we have not text pad */
1059 if (!overlay->text_linked) {
1060 GST_DEBUG_OBJECT (overlay, "seek received, pushing upstream");
1061 ret = gst_pad_push_event (overlay->video_sinkpad, event);
1065 GST_DEBUG_OBJECT (overlay, "seek received, driving from here");
1067 gst_event_parse_seek (event, NULL, NULL, &flags, NULL, NULL, NULL, NULL);
1069 /* Flush downstream, only for flushing seek */
1070 if (flags & GST_SEEK_FLAG_FLUSH)
1071 gst_pad_push_event (overlay->srcpad, gst_event_new_flush_start ());
1073 /* Mark ourself as flushing, unblock chains */
1074 GST_BASE_TEXT_OVERLAY_LOCK (overlay);
1075 overlay->video_flushing = TRUE;
1076 overlay->text_flushing = TRUE;
1077 gst_base_text_overlay_pop_text (overlay);
1078 GST_BASE_TEXT_OVERLAY_UNLOCK (overlay);
1080 /* Seek on each sink pad */
1081 gst_event_ref (event);
1082 ret = gst_pad_push_event (overlay->video_sinkpad, event);
1084 ret = gst_pad_push_event (overlay->text_sinkpad, event);
1086 gst_event_unref (event);
1091 if (overlay->text_linked) {
1092 gst_event_ref (event);
1093 ret = gst_pad_push_event (overlay->video_sinkpad, event);
1094 gst_pad_push_event (overlay->text_sinkpad, event);
1096 ret = gst_pad_push_event (overlay->video_sinkpad, event);
1107 gst_base_text_overlay_getcaps (GstPad * pad, GstBaseTextOverlay * overlay,
1113 if (G_UNLIKELY (!overlay))
1114 return gst_pad_get_pad_template_caps (pad);
1116 if (pad == overlay->srcpad)
1117 otherpad = overlay->video_sinkpad;
1119 otherpad = overlay->srcpad;
1121 /* we can do what the peer can */
1122 caps = gst_pad_peer_query_caps (otherpad, filter);
1124 GstCaps *temp, *templ;
1126 GST_DEBUG_OBJECT (pad, "peer caps %" GST_PTR_FORMAT, caps);
1128 /* filtered against our padtemplate */
1129 templ = gst_pad_get_pad_template_caps (otherpad);
1130 GST_DEBUG_OBJECT (pad, "our template %" GST_PTR_FORMAT, templ);
1131 temp = gst_caps_intersect_full (caps, templ, GST_CAPS_INTERSECT_FIRST);
1132 GST_DEBUG_OBJECT (pad, "intersected %" GST_PTR_FORMAT, temp);
1133 gst_caps_unref (caps);
1134 gst_caps_unref (templ);
1135 /* this is what we can do */
1138 /* no peer, our padtemplate is enough then */
1139 caps = gst_pad_get_pad_template_caps (pad);
1141 GstCaps *intersection;
1144 gst_caps_intersect_full (filter, caps, GST_CAPS_INTERSECT_FIRST);
1145 gst_caps_unref (caps);
1146 caps = intersection;
1150 GST_DEBUG_OBJECT (overlay, "returning %" GST_PTR_FORMAT, caps);
1156 gst_base_text_overlay_adjust_values_with_fontdesc (GstBaseTextOverlay * overlay,
1157 PangoFontDescription * desc)
1159 gint font_size = pango_font_description_get_size (desc) / PANGO_SCALE;
1160 overlay->shadow_offset = (double) (font_size) / 13.0;
1161 overlay->outline_offset = (double) (font_size) / 15.0;
1162 if (overlay->outline_offset < MINIMUM_OUTLINE_OFFSET)
1163 overlay->outline_offset = MINIMUM_OUTLINE_OFFSET;
1167 gst_base_text_overlay_get_pos (GstBaseTextOverlay * overlay,
1168 gint * xpos, gint * ypos)
1171 GstBaseTextOverlayVAlign valign;
1172 GstBaseTextOverlayHAlign halign;
1174 width = overlay->image_width;
1175 height = overlay->image_height;
1177 if (overlay->use_vertical_render)
1178 halign = GST_BASE_TEXT_OVERLAY_HALIGN_RIGHT;
1180 halign = overlay->halign;
1183 case GST_BASE_TEXT_OVERLAY_HALIGN_LEFT:
1184 *xpos = overlay->xpad;
1186 case GST_BASE_TEXT_OVERLAY_HALIGN_CENTER:
1187 *xpos = (overlay->width - width) / 2;
1189 case GST_BASE_TEXT_OVERLAY_HALIGN_RIGHT:
1190 *xpos = overlay->width - width - overlay->xpad;
1192 case GST_BASE_TEXT_OVERLAY_HALIGN_POS:
1193 *xpos = (gint) (overlay->width * overlay->xpos) - width / 2;
1194 *xpos = CLAMP (*xpos, 0, overlay->width - width);
1201 *xpos += overlay->deltax;
1203 if (overlay->use_vertical_render)
1204 valign = GST_BASE_TEXT_OVERLAY_VALIGN_TOP;
1206 valign = overlay->valign;
1209 case GST_BASE_TEXT_OVERLAY_VALIGN_BOTTOM:
1210 *ypos = overlay->height - height - overlay->ypad;
1212 case GST_BASE_TEXT_OVERLAY_VALIGN_BASELINE:
1213 *ypos = overlay->height - (height + overlay->ypad);
1215 case GST_BASE_TEXT_OVERLAY_VALIGN_TOP:
1216 *ypos = overlay->ypad;
1218 case GST_BASE_TEXT_OVERLAY_VALIGN_POS:
1219 *ypos = (gint) (overlay->height * overlay->ypos) - height / 2;
1220 *ypos = CLAMP (*ypos, 0, overlay->height - height);
1222 case GST_BASE_TEXT_OVERLAY_VALIGN_CENTER:
1223 *ypos = (overlay->height - height) / 2;
1226 *ypos = overlay->ypad;
1229 *ypos += overlay->deltay;
1233 gst_base_text_overlay_set_composition (GstBaseTextOverlay * overlay)
1236 GstVideoOverlayRectangle *rectangle;
1238 gst_base_text_overlay_get_pos (overlay, &xpos, &ypos);
1240 if (overlay->text_image) {
1241 gst_buffer_add_video_meta (overlay->text_image, GST_VIDEO_FRAME_FLAG_NONE,
1242 GST_VIDEO_OVERLAY_COMPOSITION_FORMAT_RGB,
1243 overlay->image_width, overlay->image_height);
1244 rectangle = gst_video_overlay_rectangle_new_raw (overlay->text_image,
1245 xpos, ypos, overlay->image_width, overlay->image_height,
1246 GST_VIDEO_OVERLAY_FORMAT_FLAG_PREMULTIPLIED_ALPHA);
1248 if (overlay->composition)
1249 gst_video_overlay_composition_unref (overlay->composition);
1250 overlay->composition = gst_video_overlay_composition_new (rectangle);
1251 gst_video_overlay_rectangle_unref (rectangle);
1253 } else if (overlay->composition) {
1254 gst_video_overlay_composition_unref (overlay->composition);
1255 overlay->composition = NULL;
1260 gst_text_overlay_filter_foreground_attr (PangoAttribute * attr, gpointer data)
1262 if (attr->klass->type == PANGO_ATTR_FOREGROUND) {
1270 gst_base_text_overlay_render_pangocairo (GstBaseTextOverlay * overlay,
1271 const gchar * string, gint textlen)
1274 cairo_surface_t *surface;
1275 PangoRectangle ink_rect, logical_rect;
1276 cairo_matrix_t cairo_matrix;
1278 double scalef = 1.0;
1283 g_mutex_lock (GST_BASE_TEXT_OVERLAY_GET_CLASS (overlay)->pango_lock);
1285 if (overlay->auto_adjust_size) {
1286 /* 640 pixel is default */
1287 scalef = (double) (overlay->width) / DEFAULT_SCALE_BASIS;
1289 pango_layout_set_width (overlay->layout, -1);
1290 /* set text on pango layout */
1291 pango_layout_set_markup (overlay->layout, string, textlen);
1293 /* get subtitle image size */
1294 pango_layout_get_pixel_extents (overlay->layout, &ink_rect, &logical_rect);
1296 width = (logical_rect.width + overlay->shadow_offset) * scalef;
1298 if (width + overlay->deltax >
1299 (overlay->use_vertical_render ? overlay->height : overlay->width)) {
1301 * subtitle image width is larger then overlay width
1302 * so rearrange overlay wrap mode.
1304 gst_base_text_overlay_update_wrap_mode (overlay);
1305 pango_layout_get_pixel_extents (overlay->layout, &ink_rect, &logical_rect);
1306 width = overlay->width;
1310 (logical_rect.height + logical_rect.y + overlay->shadow_offset) * scalef;
1311 if (height > overlay->height) {
1312 height = overlay->height;
1314 if (overlay->use_vertical_render) {
1315 PangoRectangle rect;
1316 PangoContext *context;
1317 PangoMatrix matrix = PANGO_MATRIX_INIT;
1320 context = pango_layout_get_context (overlay->layout);
1322 pango_matrix_rotate (&matrix, -90);
1324 rect.x = rect.y = 0;
1326 rect.height = height;
1327 pango_matrix_transform_pixel_rectangle (&matrix, &rect);
1328 matrix.x0 = -rect.x;
1329 matrix.y0 = -rect.y;
1331 pango_context_set_matrix (context, &matrix);
1333 cairo_matrix.xx = matrix.xx;
1334 cairo_matrix.yx = matrix.yx;
1335 cairo_matrix.xy = matrix.xy;
1336 cairo_matrix.yy = matrix.yy;
1337 cairo_matrix.x0 = matrix.x0;
1338 cairo_matrix.y0 = matrix.y0;
1339 cairo_matrix_scale (&cairo_matrix, scalef, scalef);
1345 cairo_matrix_init_scale (&cairo_matrix, scalef, scalef);
1348 /* reallocate overlay buffer */
1349 buffer = gst_buffer_new_and_alloc (4 * width * height);
1350 gst_buffer_replace (&overlay->text_image, buffer);
1351 gst_buffer_unref (buffer);
1353 gst_buffer_map (buffer, &map, GST_MAP_READWRITE);
1354 surface = cairo_image_surface_create_for_data (map.data,
1355 CAIRO_FORMAT_ARGB32, width, height, width * 4);
1356 cr = cairo_create (surface);
1359 cairo_set_operator (cr, CAIRO_OPERATOR_CLEAR);
1362 cairo_set_operator (cr, CAIRO_OPERATOR_OVER);
1364 if (overlay->want_shading)
1365 cairo_paint_with_alpha (cr, overlay->shading_value);
1367 /* apply transformations */
1368 cairo_set_matrix (cr, &cairo_matrix);
1370 /* FIXME: We use show_layout everywhere except for the surface
1371 * because it's really faster and internally does all kinds of
1372 * caching. Unfortunately we have to paint to a cairo path for
1373 * the outline and this is slow. Once Pango supports user fonts
1374 * we should use them, see
1375 * https://bugzilla.gnome.org/show_bug.cgi?id=598695
1377 * Idea would the be, to create a cairo user font that
1378 * does shadow, outline, text painting in the
1379 * render_glyph function.
1382 /* draw shadow text */
1384 PangoAttrList *origin_attr, *filtered_attr;
1387 pango_attr_list_ref (pango_layout_get_attributes (overlay->layout));
1389 pango_attr_list_filter (pango_attr_list_copy (origin_attr),
1390 gst_text_overlay_filter_foreground_attr, NULL);
1393 cairo_translate (cr, overlay->shadow_offset, overlay->shadow_offset);
1394 cairo_set_source_rgba (cr, 0.0, 0.0, 0.0, 0.5);
1395 pango_layout_set_attributes (overlay->layout, filtered_attr);
1396 pango_cairo_show_layout (cr, overlay->layout);
1397 pango_layout_set_attributes (overlay->layout, origin_attr);
1398 pango_attr_list_unref (filtered_attr);
1399 pango_attr_list_unref (origin_attr);
1403 a = (overlay->outline_color >> 24) & 0xff;
1404 r = (overlay->outline_color >> 16) & 0xff;
1405 g = (overlay->outline_color >> 8) & 0xff;
1406 b = (overlay->outline_color >> 0) & 0xff;
1408 /* draw outline text */
1410 cairo_set_source_rgba (cr, r / 255.0, g / 255.0, b / 255.0, a / 255.0);
1411 cairo_set_line_width (cr, overlay->outline_offset);
1412 pango_cairo_layout_path (cr, overlay->layout);
1416 a = (overlay->color >> 24) & 0xff;
1417 r = (overlay->color >> 16) & 0xff;
1418 g = (overlay->color >> 8) & 0xff;
1419 b = (overlay->color >> 0) & 0xff;
1423 cairo_set_source_rgba (cr, r / 255.0, g / 255.0, b / 255.0, a / 255.0);
1424 pango_cairo_show_layout (cr, overlay->layout);
1428 cairo_surface_destroy (surface);
1429 gst_buffer_unmap (buffer, &map);
1430 overlay->image_width = width;
1431 overlay->image_height = height;
1432 overlay->baseline_y = ink_rect.y;
1433 g_mutex_unlock (GST_BASE_TEXT_OVERLAY_GET_CLASS (overlay)->pango_lock);
1435 gst_base_text_overlay_set_composition (overlay);
1439 gst_base_text_overlay_shade_planar_Y (GstBaseTextOverlay * overlay,
1440 GstVideoFrame * dest, gint x0, gint x1, gint y0, gint y1)
1442 gint i, j, dest_stride;
1445 dest_stride = dest->info.stride[0];
1446 dest_ptr = dest->data[0];
1448 for (i = y0; i < y1; ++i) {
1449 for (j = x0; j < x1; ++j) {
1450 gint y = dest_ptr[(i * dest_stride) + j] + overlay->shading_value;
1452 dest_ptr[(i * dest_stride) + j] = CLAMP (y, 0, 255);
1458 gst_base_text_overlay_shade_packed_Y (GstBaseTextOverlay * overlay,
1459 GstVideoFrame * dest, gint x0, gint x1, gint y0, gint y1)
1462 guint dest_stride, pixel_stride;
1465 dest_stride = GST_VIDEO_FRAME_COMP_STRIDE (dest, 0);
1466 dest_ptr = GST_VIDEO_FRAME_COMP_DATA (dest, 0);
1467 pixel_stride = GST_VIDEO_FRAME_COMP_PSTRIDE (dest, 0);
1470 x0 = GST_VIDEO_FORMAT_INFO_SCALE_WIDTH (dest->info.finfo, 0, x0);
1472 x1 = GST_VIDEO_FORMAT_INFO_SCALE_WIDTH (dest->info.finfo, 0, x1);
1475 y0 = GST_VIDEO_FORMAT_INFO_SCALE_HEIGHT (dest->info.finfo, 0, y0);
1477 y1 = GST_VIDEO_FORMAT_INFO_SCALE_HEIGHT (dest->info.finfo, 0, y1);
1479 for (i = y0; i < y1; i++) {
1480 for (j = x0; j < x1; j++) {
1484 y_pos = (i * dest_stride) + j * pixel_stride;
1485 y = dest_ptr[y_pos] + overlay->shading_value;
1487 dest_ptr[y_pos] = CLAMP (y, 0, 255);
1492 #define gst_base_text_overlay_shade_BGRx gst_base_text_overlay_shade_xRGB
1493 #define gst_base_text_overlay_shade_RGBx gst_base_text_overlay_shade_xRGB
1494 #define gst_base_text_overlay_shade_xBGR gst_base_text_overlay_shade_xRGB
1496 gst_base_text_overlay_shade_xRGB (GstBaseTextOverlay * overlay,
1497 GstVideoFrame * dest, gint x0, gint x1, gint y0, gint y1)
1502 dest_ptr = dest->data[0];
1504 for (i = y0; i < y1; i++) {
1505 for (j = x0; j < x1; j++) {
1508 y_pos = (i * 4 * overlay->width) + j * 4;
1509 for (k = 0; k < 4; k++) {
1510 y = dest_ptr[y_pos + k] + overlay->shading_value;
1511 dest_ptr[y_pos + k] = CLAMP (y, 0, 255);
1519 gst_base_text_overlay_shade_rgb24 (GstBaseTextOverlay * overlay,
1520 GstVideoFrame * frame, gint x0, gint x1, gint y0, gint y1)
1522 const int pstride = 3;
1523 gint y, x, stride, shading_val, tmp;
1526 shading_val = overlay->shading_value;
1527 stride = GST_VIDEO_FRAME_PLANE_STRIDE (frame, 0);
1529 for (y = y0; y < y1; ++y) {
1530 p = GST_VIDEO_FRAME_PLANE_DATA (frame, 0);
1531 p += (y * stride) + (x0 * pstride);
1532 for (x = x0; x < x1; ++x) {
1533 tmp = *p + shading_val;
1534 *p++ = CLAMP (tmp, 0, 255);
1535 tmp = *p + shading_val;
1536 *p++ = CLAMP (tmp, 0, 255);
1537 tmp = *p + shading_val;
1538 *p++ = CLAMP (tmp, 0, 255);
1543 #define ARGB_SHADE_FUNCTION(name, OFFSET) \
1544 static inline void \
1545 gst_base_text_overlay_shade_##name (GstBaseTextOverlay * overlay, GstVideoFrame * dest, \
1546 gint x0, gint x1, gint y0, gint y1) \
1551 dest_ptr = dest->data[0];\
1553 for (i = y0; i < y1; i++) {\
1554 for (j = x0; j < x1; j++) {\
1556 y_pos = (i * 4 * overlay->width) + j * 4;\
1557 for (k = OFFSET; k < 3+OFFSET; k++) {\
1558 y = dest_ptr[y_pos + k] + overlay->shading_value;\
1559 dest_ptr[y_pos + k] = CLAMP (y, 0, 255);\
1564 ARGB_SHADE_FUNCTION (ARGB, 1);
1565 ARGB_SHADE_FUNCTION (ABGR, 1);
1566 ARGB_SHADE_FUNCTION (RGBA, 0);
1567 ARGB_SHADE_FUNCTION (BGRA, 0);
1570 gst_base_text_overlay_render_text (GstBaseTextOverlay * overlay,
1571 const gchar * text, gint textlen)
1575 if (!overlay->need_render) {
1576 GST_DEBUG ("Using previously rendered text.");
1580 /* -1 is the whole string */
1581 if (text != NULL && textlen < 0) {
1582 textlen = strlen (text);
1586 string = g_strndup (text, textlen);
1587 } else { /* empty string */
1588 string = g_strdup (" ");
1590 g_strdelimit (string, "\r\t", ' ');
1591 textlen = strlen (string);
1593 /* FIXME: should we check for UTF-8 here? */
1595 GST_DEBUG ("Rendering '%s'", string);
1596 gst_base_text_overlay_render_pangocairo (overlay, string, textlen);
1600 overlay->need_render = FALSE;
1603 /* FIXME: should probably be relative to width/height (adjusted for PAR) */
1608 gst_base_text_overlay_shade_background (GstBaseTextOverlay * overlay,
1609 GstVideoFrame * frame, gint x0, gint x1, gint y0, gint y1)
1611 x0 = CLAMP (x0 - BOX_XPAD, 0, overlay->width);
1612 x1 = CLAMP (x1 + BOX_XPAD, 0, overlay->width);
1614 y0 = CLAMP (y0 - BOX_YPAD, 0, overlay->height);
1615 y1 = CLAMP (y1 + BOX_YPAD, 0, overlay->height);
1617 switch (overlay->format) {
1618 case GST_VIDEO_FORMAT_I420:
1619 case GST_VIDEO_FORMAT_YV12:
1620 case GST_VIDEO_FORMAT_NV12:
1621 case GST_VIDEO_FORMAT_NV21:
1622 case GST_VIDEO_FORMAT_Y41B:
1623 case GST_VIDEO_FORMAT_Y42B:
1624 case GST_VIDEO_FORMAT_Y444:
1625 case GST_VIDEO_FORMAT_YUV9:
1626 case GST_VIDEO_FORMAT_YVU9:
1627 case GST_VIDEO_FORMAT_GRAY8:
1628 gst_base_text_overlay_shade_planar_Y (overlay, frame, x0, x1, y0, y1);
1630 case GST_VIDEO_FORMAT_AYUV:
1631 case GST_VIDEO_FORMAT_UYVY:
1632 case GST_VIDEO_FORMAT_YUY2:
1633 case GST_VIDEO_FORMAT_v308:
1634 gst_base_text_overlay_shade_packed_Y (overlay, frame, x0, x1, y0, y1);
1636 case GST_VIDEO_FORMAT_xRGB:
1637 gst_base_text_overlay_shade_xRGB (overlay, frame, x0, x1, y0, y1);
1639 case GST_VIDEO_FORMAT_xBGR:
1640 gst_base_text_overlay_shade_xBGR (overlay, frame, x0, x1, y0, y1);
1642 case GST_VIDEO_FORMAT_BGRx:
1643 gst_base_text_overlay_shade_BGRx (overlay, frame, x0, x1, y0, y1);
1645 case GST_VIDEO_FORMAT_RGBx:
1646 gst_base_text_overlay_shade_RGBx (overlay, frame, x0, x1, y0, y1);
1648 case GST_VIDEO_FORMAT_ARGB:
1649 gst_base_text_overlay_shade_ARGB (overlay, frame, x0, x1, y0, y1);
1651 case GST_VIDEO_FORMAT_ABGR:
1652 gst_base_text_overlay_shade_ABGR (overlay, frame, x0, x1, y0, y1);
1654 case GST_VIDEO_FORMAT_RGBA:
1655 gst_base_text_overlay_shade_RGBA (overlay, frame, x0, x1, y0, y1);
1657 case GST_VIDEO_FORMAT_BGRA:
1658 gst_base_text_overlay_shade_BGRA (overlay, frame, x0, x1, y0, y1);
1660 case GST_VIDEO_FORMAT_BGR:
1661 case GST_VIDEO_FORMAT_RGB:
1662 gst_base_text_overlay_shade_rgb24 (overlay, frame, x0, x1, y0, y1);
1665 GST_FIXME_OBJECT (overlay, "implement background shading for format %s",
1666 gst_video_format_to_string (GST_VIDEO_FRAME_FORMAT (frame)));
1671 static GstFlowReturn
1672 gst_base_text_overlay_push_frame (GstBaseTextOverlay * overlay,
1673 GstBuffer * video_frame)
1675 GstVideoFrame frame;
1677 if (overlay->composition == NULL)
1680 if (gst_pad_check_reconfigure (overlay->srcpad))
1681 gst_base_text_overlay_negotiate (overlay);
1683 video_frame = gst_buffer_make_writable (video_frame);
1685 if (overlay->attach_compo_to_buffer) {
1686 GST_DEBUG_OBJECT (overlay, "Attaching text overlay image to video buffer");
1687 gst_buffer_add_video_overlay_composition_meta (video_frame,
1688 overlay->composition);
1689 /* FIXME: emulate shaded background box if want_shading=true */
1693 if (!gst_video_frame_map (&frame, &overlay->info, video_frame,
1697 /* shaded background box */
1698 if (overlay->want_shading) {
1701 gst_base_text_overlay_get_pos (overlay, &xpos, &ypos);
1703 gst_base_text_overlay_shade_background (overlay, &frame,
1704 xpos, xpos + overlay->image_width, ypos, ypos + overlay->image_height);
1707 gst_video_overlay_composition_blend (overlay->composition, &frame);
1709 gst_video_frame_unmap (&frame);
1713 return gst_pad_push (overlay->srcpad, video_frame);
1718 gst_buffer_unref (video_frame);
1719 GST_DEBUG_OBJECT (overlay, "received invalid buffer");
1724 static GstPadLinkReturn
1725 gst_base_text_overlay_text_pad_link (GstPad * pad, GstObject * parent,
1728 GstBaseTextOverlay *overlay;
1730 overlay = GST_BASE_TEXT_OVERLAY (parent);
1731 if (G_UNLIKELY (!overlay))
1732 return GST_PAD_LINK_REFUSED;
1734 GST_DEBUG_OBJECT (overlay, "Text pad linked");
1736 overlay->text_linked = TRUE;
1738 return GST_PAD_LINK_OK;
1742 gst_base_text_overlay_text_pad_unlink (GstPad * pad, GstObject * parent)
1744 GstBaseTextOverlay *overlay;
1746 /* don't use gst_pad_get_parent() here, will deadlock */
1747 overlay = GST_BASE_TEXT_OVERLAY (parent);
1749 GST_DEBUG_OBJECT (overlay, "Text pad unlinked");
1751 overlay->text_linked = FALSE;
1753 gst_segment_init (&overlay->text_segment, GST_FORMAT_UNDEFINED);
1757 gst_base_text_overlay_text_event (GstPad * pad, GstObject * parent,
1760 gboolean ret = FALSE;
1761 GstBaseTextOverlay *overlay = NULL;
1763 overlay = GST_BASE_TEXT_OVERLAY (parent);
1765 GST_LOG_OBJECT (pad, "received event %s", GST_EVENT_TYPE_NAME (event));
1767 switch (GST_EVENT_TYPE (event)) {
1768 case GST_EVENT_CAPS:
1772 gst_event_parse_caps (event, &caps);
1773 ret = gst_base_text_overlay_setcaps_txt (overlay, caps);
1774 gst_event_unref (event);
1777 case GST_EVENT_SEGMENT:
1779 const GstSegment *segment;
1781 overlay->text_eos = FALSE;
1783 gst_event_parse_segment (event, &segment);
1785 if (segment->format == GST_FORMAT_TIME) {
1786 GST_BASE_TEXT_OVERLAY_LOCK (overlay);
1787 gst_segment_copy_into (segment, &overlay->text_segment);
1788 GST_DEBUG_OBJECT (overlay, "TEXT SEGMENT now: %" GST_SEGMENT_FORMAT,
1789 &overlay->text_segment);
1790 GST_BASE_TEXT_OVERLAY_UNLOCK (overlay);
1792 GST_ELEMENT_WARNING (overlay, STREAM, MUX, (NULL),
1793 ("received non-TIME newsegment event on text input"));
1796 gst_event_unref (event);
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_LOCK (overlay);
1802 GST_BASE_TEXT_OVERLAY_BROADCAST (overlay);
1803 GST_BASE_TEXT_OVERLAY_UNLOCK (overlay);
1808 GstClockTime start, duration;
1810 gst_event_parse_gap (event, &start, &duration);
1811 if (GST_CLOCK_TIME_IS_VALID (duration))
1813 /* we do not expect another buffer until after gap,
1814 * so that is our position now */
1815 overlay->text_segment.position = start;
1817 /* wake up the video chain, it might be waiting for a text buffer or
1818 * a text segment update */
1819 GST_BASE_TEXT_OVERLAY_LOCK (overlay);
1820 GST_BASE_TEXT_OVERLAY_BROADCAST (overlay);
1821 GST_BASE_TEXT_OVERLAY_UNLOCK (overlay);
1824 case GST_EVENT_FLUSH_STOP:
1825 GST_BASE_TEXT_OVERLAY_LOCK (overlay);
1826 GST_INFO_OBJECT (overlay, "text flush stop");
1827 overlay->text_flushing = FALSE;
1828 overlay->text_eos = FALSE;
1829 gst_base_text_overlay_pop_text (overlay);
1830 gst_segment_init (&overlay->text_segment, GST_FORMAT_TIME);
1831 GST_BASE_TEXT_OVERLAY_UNLOCK (overlay);
1832 gst_event_unref (event);
1835 case GST_EVENT_FLUSH_START:
1836 GST_BASE_TEXT_OVERLAY_LOCK (overlay);
1837 GST_INFO_OBJECT (overlay, "text flush start");
1838 overlay->text_flushing = TRUE;
1839 GST_BASE_TEXT_OVERLAY_BROADCAST (overlay);
1840 GST_BASE_TEXT_OVERLAY_UNLOCK (overlay);
1841 gst_event_unref (event);
1845 GST_BASE_TEXT_OVERLAY_LOCK (overlay);
1846 overlay->text_eos = TRUE;
1847 GST_INFO_OBJECT (overlay, "text EOS");
1848 /* wake up the video chain, it might be waiting for a text buffer or
1849 * a text segment update */
1850 GST_BASE_TEXT_OVERLAY_BROADCAST (overlay);
1851 GST_BASE_TEXT_OVERLAY_UNLOCK (overlay);
1852 gst_event_unref (event);
1856 ret = gst_pad_event_default (pad, parent, event);
1864 gst_base_text_overlay_video_event (GstPad * pad, GstObject * parent,
1867 gboolean ret = FALSE;
1868 GstBaseTextOverlay *overlay = NULL;
1870 overlay = GST_BASE_TEXT_OVERLAY (parent);
1872 GST_DEBUG_OBJECT (pad, "received event %s", GST_EVENT_TYPE_NAME (event));
1874 switch (GST_EVENT_TYPE (event)) {
1875 case GST_EVENT_CAPS:
1879 gst_event_parse_caps (event, &caps);
1880 ret = gst_base_text_overlay_setcaps (overlay, caps);
1881 gst_event_unref (event);
1884 case GST_EVENT_SEGMENT:
1886 const GstSegment *segment;
1888 GST_DEBUG_OBJECT (overlay, "received new segment");
1890 gst_event_parse_segment (event, &segment);
1892 if (segment->format == GST_FORMAT_TIME) {
1893 GST_DEBUG_OBJECT (overlay, "VIDEO SEGMENT now: %" GST_SEGMENT_FORMAT,
1896 gst_segment_copy_into (segment, &overlay->segment);
1898 GST_ELEMENT_WARNING (overlay, STREAM, MUX, (NULL),
1899 ("received non-TIME newsegment event on video input"));
1902 ret = gst_pad_event_default (pad, parent, event);
1906 GST_BASE_TEXT_OVERLAY_LOCK (overlay);
1907 GST_INFO_OBJECT (overlay, "video EOS");
1908 overlay->video_eos = TRUE;
1909 GST_BASE_TEXT_OVERLAY_UNLOCK (overlay);
1910 ret = gst_pad_event_default (pad, parent, event);
1912 case GST_EVENT_FLUSH_START:
1913 GST_BASE_TEXT_OVERLAY_LOCK (overlay);
1914 GST_INFO_OBJECT (overlay, "video flush start");
1915 overlay->video_flushing = TRUE;
1916 GST_BASE_TEXT_OVERLAY_BROADCAST (overlay);
1917 GST_BASE_TEXT_OVERLAY_UNLOCK (overlay);
1918 ret = gst_pad_event_default (pad, parent, event);
1920 case GST_EVENT_FLUSH_STOP:
1921 GST_BASE_TEXT_OVERLAY_LOCK (overlay);
1922 GST_INFO_OBJECT (overlay, "video flush stop");
1923 overlay->video_flushing = FALSE;
1924 overlay->video_eos = FALSE;
1925 gst_segment_init (&overlay->segment, GST_FORMAT_TIME);
1926 GST_BASE_TEXT_OVERLAY_UNLOCK (overlay);
1927 ret = gst_pad_event_default (pad, parent, event);
1930 ret = gst_pad_event_default (pad, parent, event);
1938 gst_base_text_overlay_video_query (GstPad * pad, GstObject * parent,
1941 gboolean ret = FALSE;
1942 GstBaseTextOverlay *overlay;
1944 overlay = GST_BASE_TEXT_OVERLAY (parent);
1946 switch (GST_QUERY_TYPE (query)) {
1947 case GST_QUERY_CAPS:
1949 GstCaps *filter, *caps;
1951 gst_query_parse_caps (query, &filter);
1952 caps = gst_base_text_overlay_getcaps (pad, overlay, filter);
1953 gst_query_set_caps_result (query, caps);
1954 gst_caps_unref (caps);
1959 ret = gst_pad_query_default (pad, parent, query);
1966 /* Called with lock held */
1968 gst_base_text_overlay_pop_text (GstBaseTextOverlay * overlay)
1970 g_return_if_fail (GST_IS_BASE_TEXT_OVERLAY (overlay));
1972 if (overlay->text_buffer) {
1973 GST_DEBUG_OBJECT (overlay, "releasing text buffer %p",
1974 overlay->text_buffer);
1975 gst_buffer_unref (overlay->text_buffer);
1976 overlay->text_buffer = NULL;
1979 /* Let the text task know we used that buffer */
1980 GST_BASE_TEXT_OVERLAY_BROADCAST (overlay);
1983 /* We receive text buffers here. If they are out of segment we just ignore them.
1984 If the buffer is in our segment we keep it internally except if another one
1985 is already waiting here, in that case we wait that it gets kicked out */
1986 static GstFlowReturn
1987 gst_base_text_overlay_text_chain (GstPad * pad, GstObject * parent,
1990 GstFlowReturn ret = GST_FLOW_OK;
1991 GstBaseTextOverlay *overlay = NULL;
1992 gboolean in_seg = FALSE;
1993 guint64 clip_start = 0, clip_stop = 0;
1995 overlay = GST_BASE_TEXT_OVERLAY (parent);
1997 GST_BASE_TEXT_OVERLAY_LOCK (overlay);
1999 if (overlay->text_flushing) {
2000 GST_BASE_TEXT_OVERLAY_UNLOCK (overlay);
2001 ret = GST_FLOW_FLUSHING;
2002 GST_LOG_OBJECT (overlay, "text flushing");
2006 if (overlay->text_eos) {
2007 GST_BASE_TEXT_OVERLAY_UNLOCK (overlay);
2009 GST_LOG_OBJECT (overlay, "text EOS");
2013 GST_LOG_OBJECT (overlay, "%" GST_SEGMENT_FORMAT " BUFFER: ts=%"
2014 GST_TIME_FORMAT ", end=%" GST_TIME_FORMAT, &overlay->segment,
2015 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buffer)),
2016 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buffer) +
2017 GST_BUFFER_DURATION (buffer)));
2019 if (G_LIKELY (GST_BUFFER_TIMESTAMP_IS_VALID (buffer))) {
2022 if (G_LIKELY (GST_BUFFER_DURATION_IS_VALID (buffer)))
2023 stop = GST_BUFFER_TIMESTAMP (buffer) + GST_BUFFER_DURATION (buffer);
2025 stop = GST_CLOCK_TIME_NONE;
2027 in_seg = gst_segment_clip (&overlay->text_segment, GST_FORMAT_TIME,
2028 GST_BUFFER_TIMESTAMP (buffer), stop, &clip_start, &clip_stop);
2034 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer))
2035 GST_BUFFER_TIMESTAMP (buffer) = clip_start;
2036 else if (GST_BUFFER_DURATION_IS_VALID (buffer))
2037 GST_BUFFER_DURATION (buffer) = clip_stop - clip_start;
2039 /* Wait for the previous buffer to go away */
2040 while (overlay->text_buffer != NULL) {
2041 GST_DEBUG ("Pad %s:%s has a buffer queued, waiting",
2042 GST_DEBUG_PAD_NAME (pad));
2043 GST_BASE_TEXT_OVERLAY_WAIT (overlay);
2044 GST_DEBUG ("Pad %s:%s resuming", GST_DEBUG_PAD_NAME (pad));
2045 if (overlay->text_flushing) {
2046 GST_BASE_TEXT_OVERLAY_UNLOCK (overlay);
2047 ret = GST_FLOW_FLUSHING;
2052 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer))
2053 overlay->text_segment.position = clip_start;
2055 overlay->text_buffer = buffer;
2056 /* That's a new text buffer we need to render */
2057 overlay->need_render = TRUE;
2059 /* in case the video chain is waiting for a text buffer, wake it up */
2060 GST_BASE_TEXT_OVERLAY_BROADCAST (overlay);
2063 GST_BASE_TEXT_OVERLAY_UNLOCK (overlay);
2070 static GstFlowReturn
2071 gst_base_text_overlay_video_chain (GstPad * pad, GstObject * parent,
2074 GstBaseTextOverlayClass *klass;
2075 GstBaseTextOverlay *overlay;
2076 GstFlowReturn ret = GST_FLOW_OK;
2077 gboolean in_seg = FALSE;
2078 guint64 start, stop, clip_start = 0, clip_stop = 0;
2081 overlay = GST_BASE_TEXT_OVERLAY (parent);
2082 klass = GST_BASE_TEXT_OVERLAY_GET_CLASS (overlay);
2084 if (!GST_BUFFER_TIMESTAMP_IS_VALID (buffer))
2085 goto missing_timestamp;
2087 /* ignore buffers that are outside of the current segment */
2088 start = GST_BUFFER_TIMESTAMP (buffer);
2090 if (!GST_BUFFER_DURATION_IS_VALID (buffer)) {
2091 stop = GST_CLOCK_TIME_NONE;
2093 stop = start + GST_BUFFER_DURATION (buffer);
2096 GST_LOG_OBJECT (overlay, "%" GST_SEGMENT_FORMAT " BUFFER: ts=%"
2097 GST_TIME_FORMAT ", end=%" GST_TIME_FORMAT, &overlay->segment,
2098 GST_TIME_ARGS (start), GST_TIME_ARGS (stop));
2100 /* segment_clip() will adjust start unconditionally to segment_start if
2101 * no stop time is provided, so handle this ourselves */
2102 if (stop == GST_CLOCK_TIME_NONE && start < overlay->segment.start)
2103 goto out_of_segment;
2105 in_seg = gst_segment_clip (&overlay->segment, GST_FORMAT_TIME, start, stop,
2106 &clip_start, &clip_stop);
2109 goto out_of_segment;
2111 /* if the buffer is only partially in the segment, fix up stamps */
2112 if (clip_start != start || (stop != -1 && clip_stop != stop)) {
2113 GST_DEBUG_OBJECT (overlay, "clipping buffer timestamp/duration to segment");
2114 buffer = gst_buffer_make_writable (buffer);
2115 GST_BUFFER_TIMESTAMP (buffer) = clip_start;
2117 GST_BUFFER_DURATION (buffer) = clip_stop - clip_start;
2120 /* now, after we've done the clipping, fix up end time if there's no
2121 * duration (we only use those estimated values internally though, we
2122 * don't want to set bogus values on the buffer itself) */
2126 gint fps_num, fps_denom;
2128 /* FIXME, store this in setcaps */
2129 caps = gst_pad_get_current_caps (pad);
2130 s = gst_caps_get_structure (caps, 0);
2131 if (gst_structure_get_fraction (s, "framerate", &fps_num, &fps_denom) &&
2132 fps_num && fps_denom) {
2133 GST_DEBUG_OBJECT (overlay, "estimating duration based on framerate");
2134 stop = start + gst_util_uint64_scale_int (GST_SECOND, fps_denom, fps_num);
2136 GST_WARNING_OBJECT (overlay, "no duration, assuming minimal duration");
2137 stop = start + 1; /* we need to assume some interval */
2139 gst_caps_unref (caps);
2142 gst_object_sync_values (GST_OBJECT (overlay), GST_BUFFER_TIMESTAMP (buffer));
2146 GST_BASE_TEXT_OVERLAY_LOCK (overlay);
2148 if (overlay->video_flushing)
2151 if (overlay->video_eos)
2154 if (overlay->silent) {
2155 GST_BASE_TEXT_OVERLAY_UNLOCK (overlay);
2156 ret = gst_pad_push (overlay->srcpad, buffer);
2158 /* Update position */
2159 overlay->segment.position = clip_start;
2164 /* Text pad not linked, rendering internal text */
2165 if (!overlay->text_linked) {
2166 if (klass->get_text) {
2167 text = klass->get_text (overlay, buffer);
2169 text = g_strdup (overlay->default_text);
2172 GST_LOG_OBJECT (overlay, "Text pad not linked, rendering default "
2173 "text: '%s'", GST_STR_NULL (text));
2175 GST_BASE_TEXT_OVERLAY_UNLOCK (overlay);
2177 if (text != NULL && *text != '\0') {
2178 /* Render and push */
2179 gst_base_text_overlay_render_text (overlay, text, -1);
2180 ret = gst_base_text_overlay_push_frame (overlay, buffer);
2182 /* Invalid or empty string */
2183 ret = gst_pad_push (overlay->srcpad, buffer);
2186 /* Text pad linked, check if we have a text buffer queued */
2187 if (overlay->text_buffer) {
2188 gboolean pop_text = FALSE, valid_text_time = TRUE;
2189 GstClockTime text_start = GST_CLOCK_TIME_NONE;
2190 GstClockTime text_end = GST_CLOCK_TIME_NONE;
2191 GstClockTime text_running_time = GST_CLOCK_TIME_NONE;
2192 GstClockTime text_running_time_end = GST_CLOCK_TIME_NONE;
2193 GstClockTime vid_running_time, vid_running_time_end;
2195 /* if the text buffer isn't stamped right, pop it off the
2196 * queue and display it for the current video frame only */
2197 if (!GST_BUFFER_TIMESTAMP_IS_VALID (overlay->text_buffer) ||
2198 !GST_BUFFER_DURATION_IS_VALID (overlay->text_buffer)) {
2199 GST_WARNING_OBJECT (overlay,
2200 "Got text buffer with invalid timestamp or duration");
2202 valid_text_time = FALSE;
2204 text_start = GST_BUFFER_TIMESTAMP (overlay->text_buffer);
2205 text_end = text_start + GST_BUFFER_DURATION (overlay->text_buffer);
2209 gst_segment_to_running_time (&overlay->segment, GST_FORMAT_TIME,
2211 vid_running_time_end =
2212 gst_segment_to_running_time (&overlay->segment, GST_FORMAT_TIME,
2215 /* If timestamp and duration are valid */
2216 if (valid_text_time) {
2218 gst_segment_to_running_time (&overlay->segment, GST_FORMAT_TIME,
2220 text_running_time_end =
2221 gst_segment_to_running_time (&overlay->segment, GST_FORMAT_TIME,
2225 GST_LOG_OBJECT (overlay, "T: %" GST_TIME_FORMAT " - %" GST_TIME_FORMAT,
2226 GST_TIME_ARGS (text_running_time),
2227 GST_TIME_ARGS (text_running_time_end));
2228 GST_LOG_OBJECT (overlay, "V: %" GST_TIME_FORMAT " - %" GST_TIME_FORMAT,
2229 GST_TIME_ARGS (vid_running_time),
2230 GST_TIME_ARGS (vid_running_time_end));
2232 /* Text too old or in the future */
2233 if (valid_text_time && text_running_time_end <= vid_running_time) {
2234 /* text buffer too old, get rid of it and do nothing */
2235 GST_LOG_OBJECT (overlay, "text buffer too old, popping");
2237 gst_base_text_overlay_pop_text (overlay);
2238 GST_BASE_TEXT_OVERLAY_UNLOCK (overlay);
2239 goto wait_for_text_buf;
2240 } else if (valid_text_time && vid_running_time_end <= text_running_time) {
2241 GST_LOG_OBJECT (overlay, "text in future, pushing video buf");
2242 GST_BASE_TEXT_OVERLAY_UNLOCK (overlay);
2243 /* Push the video frame */
2244 ret = gst_pad_push (overlay->srcpad, buffer);
2250 gst_buffer_map (overlay->text_buffer, &map, GST_MAP_READ);
2251 in_text = (gchar *) map.data;
2255 /* g_markup_escape_text() absolutely requires valid UTF8 input, it
2256 * might crash otherwise. We don't fall back on GST_SUBTITLE_ENCODING
2257 * here on purpose, this is something that needs fixing upstream */
2258 if (!g_utf8_validate (in_text, in_size, NULL)) {
2259 const gchar *end = NULL;
2261 GST_WARNING_OBJECT (overlay, "received invalid UTF-8");
2262 in_text = g_strndup (in_text, in_size);
2263 while (!g_utf8_validate (in_text, in_size, &end) && end)
2264 *((gchar *) end) = '*';
2267 /* Get the string */
2268 if (overlay->have_pango_markup) {
2269 text = g_strndup (in_text, in_size);
2271 text = g_markup_escape_text (in_text, in_size);
2274 if (text != NULL && *text != '\0') {
2275 gint text_len = strlen (text);
2277 while (text_len > 0 && (text[text_len - 1] == '\n' ||
2278 text[text_len - 1] == '\r')) {
2281 GST_DEBUG_OBJECT (overlay, "Rendering text '%*s'", text_len, text);
2282 gst_base_text_overlay_render_text (overlay, text, text_len);
2284 GST_DEBUG_OBJECT (overlay, "No text to render (empty buffer)");
2285 gst_base_text_overlay_render_text (overlay, " ", 1);
2287 if (in_text != (gchar *) map.data)
2290 GST_DEBUG_OBJECT (overlay, "No text to render (empty buffer)");
2291 gst_base_text_overlay_render_text (overlay, " ", 1);
2294 gst_buffer_unmap (overlay->text_buffer, &map);
2296 GST_BASE_TEXT_OVERLAY_UNLOCK (overlay);
2297 ret = gst_base_text_overlay_push_frame (overlay, buffer);
2299 if (valid_text_time && text_running_time_end <= vid_running_time_end) {
2300 GST_LOG_OBJECT (overlay, "text buffer not needed any longer");
2305 GST_BASE_TEXT_OVERLAY_LOCK (overlay);
2306 gst_base_text_overlay_pop_text (overlay);
2307 GST_BASE_TEXT_OVERLAY_UNLOCK (overlay);
2310 gboolean wait_for_text_buf = TRUE;
2312 if (overlay->text_eos)
2313 wait_for_text_buf = FALSE;
2315 if (!overlay->wait_text)
2316 wait_for_text_buf = FALSE;
2318 /* Text pad linked, but no text buffer available - what now? */
2319 if (overlay->text_segment.format == GST_FORMAT_TIME) {
2320 GstClockTime text_start_running_time, text_position_running_time;
2321 GstClockTime vid_running_time;
2324 gst_segment_to_running_time (&overlay->segment, GST_FORMAT_TIME,
2325 GST_BUFFER_TIMESTAMP (buffer));
2326 text_start_running_time =
2327 gst_segment_to_running_time (&overlay->text_segment,
2328 GST_FORMAT_TIME, overlay->text_segment.start);
2329 text_position_running_time =
2330 gst_segment_to_running_time (&overlay->text_segment,
2331 GST_FORMAT_TIME, overlay->text_segment.position);
2333 if ((GST_CLOCK_TIME_IS_VALID (text_start_running_time) &&
2334 vid_running_time < text_start_running_time) ||
2335 (GST_CLOCK_TIME_IS_VALID (text_position_running_time) &&
2336 vid_running_time < text_position_running_time)) {
2337 wait_for_text_buf = FALSE;
2341 if (wait_for_text_buf) {
2342 GST_DEBUG_OBJECT (overlay, "no text buffer, need to wait for one");
2343 GST_BASE_TEXT_OVERLAY_WAIT (overlay);
2344 GST_DEBUG_OBJECT (overlay, "resuming");
2345 GST_BASE_TEXT_OVERLAY_UNLOCK (overlay);
2346 goto wait_for_text_buf;
2348 GST_BASE_TEXT_OVERLAY_UNLOCK (overlay);
2349 GST_LOG_OBJECT (overlay, "no need to wait for a text buffer");
2350 ret = gst_pad_push (overlay->srcpad, buffer);
2357 /* Update position */
2358 overlay->segment.position = clip_start;
2364 GST_WARNING_OBJECT (overlay, "buffer without timestamp, discarding");
2365 gst_buffer_unref (buffer);
2371 GST_BASE_TEXT_OVERLAY_UNLOCK (overlay);
2372 GST_DEBUG_OBJECT (overlay, "flushing, discarding buffer");
2373 gst_buffer_unref (buffer);
2374 return GST_FLOW_FLUSHING;
2378 GST_BASE_TEXT_OVERLAY_UNLOCK (overlay);
2379 GST_DEBUG_OBJECT (overlay, "eos, discarding buffer");
2380 gst_buffer_unref (buffer);
2381 return GST_FLOW_EOS;
2385 GST_DEBUG_OBJECT (overlay, "buffer out of segment, discarding");
2386 gst_buffer_unref (buffer);
2391 static GstStateChangeReturn
2392 gst_base_text_overlay_change_state (GstElement * element,
2393 GstStateChange transition)
2395 GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
2396 GstBaseTextOverlay *overlay = GST_BASE_TEXT_OVERLAY (element);
2398 switch (transition) {
2399 case GST_STATE_CHANGE_PAUSED_TO_READY:
2400 GST_BASE_TEXT_OVERLAY_LOCK (overlay);
2401 overlay->text_flushing = TRUE;
2402 overlay->video_flushing = TRUE;
2403 /* pop_text will broadcast on the GCond and thus also make the video
2404 * chain exit if it's waiting for a text buffer */
2405 gst_base_text_overlay_pop_text (overlay);
2406 GST_BASE_TEXT_OVERLAY_UNLOCK (overlay);
2412 ret = parent_class->change_state (element, transition);
2413 if (ret == GST_STATE_CHANGE_FAILURE)
2416 switch (transition) {
2417 case GST_STATE_CHANGE_READY_TO_PAUSED:
2418 GST_BASE_TEXT_OVERLAY_LOCK (overlay);
2419 overlay->text_flushing = FALSE;
2420 overlay->video_flushing = FALSE;
2421 overlay->video_eos = FALSE;
2422 overlay->text_eos = FALSE;
2423 gst_segment_init (&overlay->segment, GST_FORMAT_TIME);
2424 gst_segment_init (&overlay->text_segment, GST_FORMAT_TIME);
2425 GST_BASE_TEXT_OVERLAY_UNLOCK (overlay);
2435 plugin_init (GstPlugin * plugin)
2437 if (!gst_element_register (plugin, "textoverlay", GST_RANK_NONE,
2438 GST_TYPE_TEXT_OVERLAY) ||
2439 !gst_element_register (plugin, "timeoverlay", GST_RANK_NONE,
2440 GST_TYPE_TIME_OVERLAY) ||
2441 !gst_element_register (plugin, "clockoverlay", GST_RANK_NONE,
2442 GST_TYPE_CLOCK_OVERLAY) ||
2443 !gst_element_register (plugin, "textrender", GST_RANK_NONE,
2444 GST_TYPE_TEXT_RENDER)) {
2448 /*texttestsrc_plugin_init(module, plugin); */
2450 GST_DEBUG_CATEGORY_INIT (pango_debug, "pango", 0, "Pango elements");
2455 GST_PLUGIN_DEFINE (GST_VERSION_MAJOR, GST_VERSION_MINOR,
2456 pango, "Pango-based text rendering and overlay", plugin_init,
2457 VERSION, GST_LICENSE, GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)