1 /* Generic video mixer plugin
2 * Copyright (C) 2004 Wim Taymans <wim@fluendo.com>
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Library General Public License for more details.
14 * You should have received a copy of the GNU Library General Public
15 * License along with this library; if not, write to the
16 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 * Boston, MA 02111-1307, USA.
27 GST_DEBUG_CATEGORY_STATIC (gst_videomixer_debug);
28 #define GST_CAT_DEFAULT gst_videomixer_debug
30 #define GST_TYPE_VIDEO_MIXER_PAD (gst_videomixer_pad_get_type())
31 #define GST_VIDEO_MIXER_PAD(obj) \
32 (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_VIDEO_MIXER_PAD, GstVideoMixerPad))
33 #define GST_VIDEO_MIXER_PAD_CLASS(klass) \
34 (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_VIDEO_MIXER_PAD, GstVideoMixerPadiClass))
35 #define GST_IS_VIDEO_MIXER_PAD(obj) \
36 (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_VIDEO_MIXER_PAD))
37 #define GST_IS_VIDEO_MIXER_PAD_CLASS(obj) \
38 (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_VIDEO_MIXER_PAD))
40 typedef struct _GstVideoMixerPad GstVideoMixerPad;
41 typedef struct _GstVideoMixerPadClass GstVideoMixerPadClass;
43 static void gst_videomixer_pad_base_init (gpointer g_class);
44 static void gst_videomixer_pad_class_init (GstVideoMixerPadClass * klass);
45 static void gst_videomixer_pad_init (GstVideoMixerPad * mixerpad);
47 static void gst_videomixer_pad_get_property (GObject * object, guint prop_id,
48 GValue * value, GParamSpec * pspec);
49 static void gst_videomixer_pad_set_property (GObject * object, guint prop_id,
50 const GValue * value, GParamSpec * pspec);
52 #define DEFAULT_PAD_ZORDER 0
53 #define DEFAULT_PAD_XPOS 0
54 #define DEFAULT_PAD_YPOS 0
55 #define DEFAULT_PAD_ALPHA 1.0
65 /* all information needed for one video stream */
66 struct _GstVideoMixerPad
68 GstRealPad parent; /* subclass the pad */
70 GstBuffer *buffer; /* the queued buffer for this pad */
75 guint in_width, in_height;
84 struct _GstVideoMixerPadClass
86 GstRealPadClass parent_class;
90 gst_videomixer_pad_get_type (void)
92 static GType videomixer_pad_type = 0;
94 if (!videomixer_pad_type) {
95 static const GTypeInfo videomixer_pad_info = {
96 sizeof (GstVideoMixerPadClass),
97 gst_videomixer_pad_base_init,
99 (GClassInitFunc) gst_videomixer_pad_class_init,
102 sizeof (GstVideoMixerPad),
104 (GInstanceInitFunc) gst_videomixer_pad_init,
107 videomixer_pad_type =
108 g_type_register_static (GST_TYPE_REAL_PAD,
109 "GstVideoMixerPad", &videomixer_pad_info, 0);
111 return videomixer_pad_type;
115 gst_videomixer_pad_base_init (gpointer g_class)
120 gst_videomixer_pad_class_init (GstVideoMixerPadClass * klass)
122 GObjectClass *gobject_class;
124 gobject_class = (GObjectClass *) klass;
126 gobject_class->set_property =
127 GST_DEBUG_FUNCPTR (gst_videomixer_pad_set_property);
128 gobject_class->get_property =
129 GST_DEBUG_FUNCPTR (gst_videomixer_pad_get_property);
131 g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_PAD_ZORDER,
132 g_param_spec_uint ("zorder", "Z-Order", "Z Order of the picture",
133 0, 10000, DEFAULT_PAD_ZORDER, G_PARAM_READWRITE));
134 g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_PAD_XPOS,
135 g_param_spec_int ("xpos", "X Position", "X Position of the picture",
136 G_MININT, G_MAXINT, DEFAULT_PAD_XPOS, G_PARAM_READWRITE));
137 g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_PAD_YPOS,
138 g_param_spec_int ("ypos", "Y Position", "Y Position of the picture",
139 G_MININT, G_MAXINT, DEFAULT_PAD_YPOS, G_PARAM_READWRITE));
140 g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_PAD_ALPHA,
141 g_param_spec_double ("alpha", "Alpha", "Alpha of the picture",
142 0.0, 1.0, DEFAULT_PAD_ALPHA, G_PARAM_READWRITE));
145 static const GstEventMask *
146 gst_videomixer_pad_get_sink_event_masks (GstPad * pad)
148 static const GstEventMask gst_videomixer_sink_event_masks[] = {
153 return gst_videomixer_sink_event_masks;
157 gst_videomixer_pad_get_property (GObject * object, guint prop_id,
158 GValue * value, GParamSpec * pspec)
160 GstVideoMixerPad *pad;
162 g_return_if_fail (GST_IS_VIDEO_MIXER_PAD (object));
164 pad = GST_VIDEO_MIXER_PAD (object);
168 g_value_set_uint (value, pad->zorder);
171 g_value_set_int (value, pad->xpos);
174 g_value_set_int (value, pad->ypos);
177 g_value_set_double (value, pad->alpha);
180 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
186 gst_videomixer_pad_set_property (GObject * object, guint prop_id,
187 const GValue * value, GParamSpec * pspec)
189 GstVideoMixerPad *pad;
191 g_return_if_fail (GST_IS_PAD (object));
193 pad = GST_VIDEO_MIXER_PAD (object);
197 pad->zorder = g_value_get_uint (value);
200 pad->xpos = g_value_get_int (value);
203 pad->ypos = g_value_get_int (value);
206 pad->alpha = g_value_get_double (value);
209 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
214 #define GST_TYPE_VIDEO_MIXER (gst_videomixer_get_type())
215 #define GST_VIDEO_MIXER(obj) \
216 (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_VIDEO_MIXER, GstVideoMixer))
217 #define GST_VIDEO_MIXER_CLASS(klass) \
218 (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_VIDEO_MIXER, GstVideoMixerClass))
219 #define GST_IS_VIDEO_MIXER(obj) \
220 (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_VIDEO_MIXER))
221 #define GST_IS_VIDEO_MIXER_CLASS(obj) \
222 (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_VIDEO_MIXER))
224 typedef struct _GstVideoMixer GstVideoMixer;
225 typedef struct _GstVideoMixerClass GstVideoMixerClass;
227 GType gst_videomixer_get_type (void);
231 VIDEO_MIXER_BACKGROUND_CHECKER,
232 VIDEO_MIXER_BACKGROUND_BLACK,
233 VIDEO_MIXER_BACKGROUND_WHITE,
235 GstVideoMixerBackground;
237 struct _GstVideoMixer
244 /* sinkpads, a GSList of GstVideoMixerPads */
249 GstVideoMixerPad *master;
251 gint in_width, in_height;
252 gint out_width, out_height;
254 GstVideoMixerBackground background;
256 gdouble in_framerate;
259 struct _GstVideoMixerClass
261 GstElementClass parent_class;
264 static GstPadLinkReturn
265 gst_videomixer_pad_sinkconnect (GstPad * pad, const GstCaps * vscaps)
268 GstVideoMixerPad *mixpad;
269 GstStructure *structure;
271 mix = GST_VIDEO_MIXER (gst_pad_get_parent (pad));
272 mixpad = GST_VIDEO_MIXER_PAD (pad);
274 GST_DEBUG ("videomixer: sinkconnect triggered on %s", gst_pad_get_name (pad));
276 structure = gst_caps_get_structure (vscaps, 0);
278 gst_structure_get_int (structure, "width", &mixpad->in_width);
279 gst_structure_get_int (structure, "height", &mixpad->in_height);
280 gst_structure_get_double (structure, "framerate", &mixpad->in_framerate);
285 mix->in_width = MAX (mix->in_width, mixpad->in_width);
286 mix->in_height = MAX (mix->in_height, mixpad->in_height);
287 mix->in_framerate = mixpad->in_framerate;
289 return GST_PAD_LINK_OK;
293 gst_videomixer_pad_link (GstPad * pad, GstPad * peer, gpointer data)
295 //GstVideoMixer *videomixer = GST_VIDEO_MIXER (data);
296 const gchar *padname = gst_pad_get_name (pad);
298 GST_DEBUG ("pad '%s' connected", padname);
302 gst_videomixer_pad_unlink (GstPad * pad, GstPad * peer, gpointer data)
304 //GstVideoMixer *videomixer = GST_VIDEO_MIXER (data);
305 const gchar *padname = gst_pad_get_name (pad);
307 GST_DEBUG ("pad '%s' unlinked", padname);
311 gst_videomixer_pad_init (GstVideoMixerPad * mixerpad)
313 g_signal_connect (mixerpad, "linked",
314 G_CALLBACK (gst_videomixer_pad_link), (gpointer) mixerpad);
315 g_signal_connect (mixerpad, "unlinked",
316 G_CALLBACK (gst_videomixer_pad_unlink), (gpointer) mixerpad);
318 /* setup some pad functions */
319 gst_pad_set_link_function (GST_PAD (mixerpad),
320 gst_videomixer_pad_sinkconnect);
321 gst_pad_set_event_mask_function (GST_PAD (mixerpad),
322 gst_videomixer_pad_get_sink_event_masks);
324 mixerpad->zorder = DEFAULT_PAD_ZORDER;
325 mixerpad->xpos = DEFAULT_PAD_XPOS;
326 mixerpad->ypos = DEFAULT_PAD_YPOS;
327 mixerpad->alpha = DEFAULT_PAD_ALPHA;
332 /* elementfactory information */
333 static GstElementDetails gst_videomixer_details =
334 GST_ELEMENT_DETAILS ("video mixer",
335 "Filter/Editor/Video",
336 "Mix multiple video streams",
337 "Wim Taymans <wim@fluendo.com>");
339 /* VideoMixer signals and args */
346 #define DEFAULT_BACKGROUND VIDEO_MIXER_BACKGROUND_CHECKER
353 #define GST_TYPE_VIDEO_MIXER_BACKGROUND (gst_video_mixer_background_get_type())
355 gst_video_mixer_background_get_type (void)
357 static GType video_mixer_background_type = 0;
358 static GEnumValue video_mixer_background[] = {
359 {VIDEO_MIXER_BACKGROUND_CHECKER, "0", "Checker pattern"},
360 {VIDEO_MIXER_BACKGROUND_BLACK, "1", "Black"},
361 {VIDEO_MIXER_BACKGROUND_WHITE, "2", "White"},
365 if (!video_mixer_background_type) {
366 video_mixer_background_type =
367 g_enum_register_static ("GstVideoMixerBackground",
368 video_mixer_background);
370 return video_mixer_background_type;
373 static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src",
376 GST_STATIC_CAPS ("video/x-raw-yuv,"
377 "format = (fourcc) I420,"
378 "width = (int) [ 16, 4096 ],"
379 "height = (int) [ 16, 4096 ]," "framerate = (double) [ 0, max ]")
382 static GstStaticPadTemplate sink_factory = GST_STATIC_PAD_TEMPLATE ("sink_%d",
385 GST_STATIC_CAPS ("video/x-raw-yuv,"
386 "format = (fourcc) AYUV,"
387 "width = (int) [ 16, 4096 ],"
388 "height = (int) [ 16, 4096 ]," "framerate = (double) [ 0, max ]")
391 static void gst_videomixer_base_init (gpointer g_class);
392 static void gst_videomixer_class_init (GstVideoMixerClass * klass);
393 static void gst_videomixer_init (GstVideoMixer * videomixer);
395 static void gst_videomixer_loop (GstElement * element);
396 static gboolean gst_videomixer_handle_src_event (GstPad * pad,
398 static GstPad *gst_videomixer_request_new_pad (GstElement * element,
399 GstPadTemplate * templ, const gchar * name);
400 static void gst_videomixer_set_property (GObject * object, guint prop_id,
401 const GValue * value, GParamSpec * pspec);
402 static void gst_videomixer_get_property (GObject * object, guint prop_id,
403 GValue * value, GParamSpec * pspec);
404 static GstElementStateReturn gst_videomixer_change_state (GstElement * element);
406 static GstElementClass *parent_class = NULL;
408 /*static guint gst_videomixer_signals[LAST_SIGNAL] = { 0 }; */
411 gst_videomixer_get_type (void)
413 static GType videomixer_type = 0;
415 if (!videomixer_type) {
416 static const GTypeInfo videomixer_info = {
417 sizeof (GstVideoMixerClass),
418 gst_videomixer_base_init,
420 (GClassInitFunc) gst_videomixer_class_init,
423 sizeof (GstVideoMixer),
425 (GInstanceInitFunc) gst_videomixer_init,
429 g_type_register_static (GST_TYPE_ELEMENT, "GstVideoMixer",
430 &videomixer_info, 0);
432 return videomixer_type;
436 gst_videomixer_base_init (gpointer g_class)
438 GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
440 gst_element_class_add_pad_template (element_class,
441 gst_static_pad_template_get (&src_factory));
442 gst_element_class_add_pad_template (element_class,
443 gst_static_pad_template_get (&sink_factory));
445 gst_element_class_set_details (element_class, &gst_videomixer_details);
449 gst_videomixer_class_init (GstVideoMixerClass * klass)
451 GObjectClass *gobject_class;
452 GstElementClass *gstelement_class;
454 gobject_class = (GObjectClass *) klass;
455 gstelement_class = (GstElementClass *) klass;
457 parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
459 g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_BACKGROUND,
460 g_param_spec_enum ("background", "Background", "Background type",
461 GST_TYPE_VIDEO_MIXER_BACKGROUND,
462 DEFAULT_BACKGROUND, G_PARAM_READWRITE));
464 gstelement_class->request_new_pad = gst_videomixer_request_new_pad;
466 gstelement_class->change_state = gst_videomixer_change_state;
468 gstelement_class->get_property = gst_videomixer_get_property;
469 gstelement_class->set_property = gst_videomixer_set_property;
473 gst_videomixer_init (GstVideoMixer * mix)
475 GstElementClass *klass = GST_ELEMENT_GET_CLASS (mix);
478 gst_pad_new_from_template (gst_element_class_get_pad_template (klass,
480 gst_pad_set_event_function (mix->srcpad, gst_videomixer_handle_src_event);
481 gst_element_add_pad (GST_ELEMENT (mix), mix->srcpad);
483 GST_FLAG_SET (GST_ELEMENT (mix), GST_ELEMENT_EVENT_AWARE);
485 mix->sinkpads = NULL;
486 mix->background = DEFAULT_BACKGROUND;
492 gst_element_set_loop_function (GST_ELEMENT (mix), gst_videomixer_loop);
496 gst_videomixer_request_new_pad (GstElement * element,
497 GstPadTemplate * templ, const gchar * req_name)
501 GstElementClass *klass = GST_ELEMENT_GET_CLASS (element);
503 g_return_val_if_fail (templ != NULL, NULL);
505 if (templ->direction != GST_PAD_SINK) {
506 g_warning ("videomixer: request pad that is not a SINK pad\n");
510 g_return_val_if_fail (GST_IS_VIDEO_MIXER (element), NULL);
512 mix = GST_VIDEO_MIXER (element);
514 if (templ == gst_element_class_get_pad_template (klass, "sink_%d")) {
516 GstVideoMixerPad *mixpad;
518 /* create new pad with the name */
519 name = g_strdup_printf ("sink_%02d", mix->numpads);
521 gst_pad_custom_new_from_template (GST_TYPE_VIDEO_MIXER_PAD, templ,
525 mixpad = GST_VIDEO_MIXER_PAD (newpad);
527 mixpad->zorder = mix->numpads;
529 if (mix->numpads == 1) {
530 mix->master = mixpad;
532 mix->sinkpads = g_slist_append (mix->sinkpads, newpad);
534 g_warning ("videomixer: this is not our template!\n");
538 /* dd the pad to the element */
539 gst_element_add_pad (element, newpad);
546 gst_videomixer_handle_src_event (GstPad * pad, GstEvent * event)
551 mix = GST_VIDEO_MIXER (gst_pad_get_parent (pad));
553 type = event ? GST_EVENT_TYPE (event) : GST_EVENT_UNKNOWN;
557 /* disable seeking for now */
563 return gst_pad_event_default (pad, event);
566 #define BLEND_NORMAL(Y1,U1,V1,Y2,U2,V2,alpha,Y,U,V) \
567 Y = ((Y1*(255-alpha))+(Y2*alpha))>>8; \
568 U = ((U1*(255-alpha))+(U2*alpha))>>8; \
569 V = ((V1*(255-alpha))+(V2*alpha))>>8;
571 #define BLEND_ADD(Y1,U1,V1,Y2,U2,V2,alpha,Y,U,V) \
572 Y = Y1+((Y2*alpha)>>8); \
573 U = U1+(((127*(255-alpha)+(U2*alpha)))>>8)-127; \
574 V = V1+(((127*(255-alpha)+(V2*alpha)))>>8)-127; \
576 gint mult = MAX (0, 288-Y); \
577 U = ((U*mult) + (127*(32-mult)))>>5; \
578 V = ((V*mult) + (127*(32-mult)))>>5; \
584 #define BLEND_SUBTRACT(Y1,U1,V1,Y2,U2,V2,alpha,Y,U,V) \
585 Y = Y1-((Y2*alpha)>>8); \
586 U = U1+(((127*(255-alpha)+(U2*alpha)))>>8)-127; \
587 V = V1+(((127*(255-alpha)+(V2*alpha)))>>8)-127; \
589 gint mult = MIN (32, -Y); \
590 U = ((U*(32-mult)) + (127*mult))>>5; \
591 V = ((V*(32-mult)) + (127*mult))>>5; \
595 #define BLEND_DARKEN(Y1,U1,V1,Y2,U2,V2,alpha,Y,U,V) \
597 Y = Y1; U = U1; V = V1; \
600 Y = ((Y1*(255-alpha))+(Y2*alpha))>>8; \
601 U = ((U1*(255-alpha))+(U2*alpha))>>8; \
602 V = ((V1*(255-alpha))+(V2*alpha))>>8; \
605 #define BLEND_LIGHTEN(Y1,U1,V1,Y2,U2,V2,alpha,Y,U,V) \
607 Y = Y1; U = U1; V = V1; \
610 Y = ((Y1*(255-alpha))+(Y2*alpha))>>8; \
611 U = ((U1*(255-alpha))+(U2*alpha))>>8; \
612 V = ((V1*(255-alpha))+(V2*alpha))>>8; \
615 #define BLEND_MULTIPLY(Y1,U1,V1,Y2,U2,V2,alpha,Y,U,V) \
616 Y = (Y1*(256*(255-alpha) +(Y2*alpha)))>>16; \
617 U = ((U1*(255-alpha)*256)+(alpha*(U1*Y2+128*(256-Y2))))>>16; \
618 V = ((V1*(255-alpha)*256)+(alpha*(V1*Y2+128*(256-Y2))))>>16;
620 #define BLEND_DIFFERENCE(Y1,U1,V1,Y2,U2,V2,alpha,Y,U,V) \
621 Y = ABS((gint)Y1-(gint)Y2)+127; \
622 U = ABS((gint)U1-(gint)U2)+127; \
623 V = ABS((gint)V1-(gint)V2)+127; \
624 Y = ((Y*alpha)+(Y1*(255-alpha)))>>8; \
625 U = ((U*alpha)+(U1*(255-alpha)))>>8; \
626 V = ((V*alpha)+(V1*(255-alpha)))>>8; \
628 gint mult = MAX (0, 288-Y); \
629 U = ((U*mult) + (127*(32-mult)))>>5; \
630 V = ((V*mult) + (127*(32-mult)))>>5; \
633 gint mult = MIN (32, -Y); \
634 U = ((U*(32-mult)) + (127*mult))>>5; \
635 V = ((V*(32-mult)) + (127*mult))>>5; \
638 U = CLAMP(U, 0, 255); \
639 V = CLAMP(V, 0, 255);
641 #define BLEND_EXCLUSION(Y1,U1,V1,Y2,U2,V2,alpha,Y,U,V) \
642 Y = ((gint)(Y1^0xff)*Y2+(gint)(Y2^0xff)*Y1)>>8; \
643 U = ((gint)(U1^0xff)*Y2+(gint)(Y2^0xff)*U1)>>8; \
644 V = ((gint)(V1^0xff)*Y2+(gint)(Y2^0xff)*V1)>>8; \
645 Y = ((Y*alpha)+(Y1*(255-alpha)))>>8; \
646 U = ((U*alpha)+(U1*(255-alpha)))>>8; \
647 V = ((V*alpha)+(V1*(255-alpha)))>>8; \
649 gint mult = MAX (0, 288-Y); \
650 U = ((U*mult) + (127*(32-mult)))>>5; \
651 V = ((V*mult) + (127*(32-mult)))>>5; \
654 gint mult = MIN (32, -Y); \
655 U = ((U*(32-mult)) + (127*mult))>>5; \
656 V = ((V*(32-mult)) + (127*mult))>>5; \
659 U = CLAMP(U, 0, 255); \
660 V = CLAMP(V, 0, 255);
662 #define BLEND_SOFTLIGHT(Y1,U1,V1,Y2,U2,V2,alpha,Y,U,V) \
663 Y = (gint)Y1+(gint)Y2 - 127; \
664 U = (gint)U1+(gint)U2 - 127; \
665 V = (gint)V1+(gint)V2 - 127; \
666 Y = ((Y*alpha)+(Y1*(255-alpha)))>>8; \
667 U = ((U*alpha)+(U1*(255-alpha)))>>8; \
668 V = ((V*alpha)+(V1*(255-alpha)))>>8; \
670 gint mult = MAX (0, 288-Y); \
671 U = ((U*mult) + (127*(32-mult)))>>5; \
672 V = ((V*mult) + (127*(32-mult)))>>5; \
675 gint mult = MIN (32, -Y); \
676 U = ((U*(32-mult)) + (127*mult))>>5; \
677 V = ((V*(32-mult)) + (127*mult))>>5; \
681 #define BLEND_HARDLIGHT(Y1,U1,V1,Y2,U2,V2,alpha,Y,U,V) \
682 Y = (gint)Y1+(gint)Y2*2 - 255; \
683 U = (gint)U1+(gint)U2 - 127; \
684 V = (gint)V1+(gint)V2 - 127; \
685 Y = ((Y*alpha)+(Y1*(255-alpha)))>>8; \
686 U = ((U*alpha)+(U1*(255-alpha)))>>8; \
687 V = ((V*alpha)+(V1*(255-alpha)))>>8; \
689 gint mult = MAX (0, 288-Y); \
690 U = ((U*mult) + (127*(32-mult)))>>5; \
691 V = ((V*mult) + (127*(32-mult)))>>5; \
694 gint mult = MIN (32, -Y); \
695 U = ((U*(32-mult)) + (127*mult))>>5; \
696 V = ((V*(32-mult)) + (127*mult))>>5; \
700 #define BLEND_MODE BLEND_NORMAL
702 #define BLEND_MODE BLEND_ADD
703 #define BLEND_MODE BLEND_SUBTRACT
704 #define BLEND_MODE BLEND_DARKEN
705 #define BLEND_MODE BLEND_LIGHTEN
706 #define BLEND_MODE BLEND_MULTIPLY
707 #define BLEND_MODE BLEND_DIFFERENCE
708 #define BLEND_MODE BLEND_EXCLUSION
709 #define BLEND_MODE BLEND_SOFTLIGHT
710 #define BLEND_MODE BLEND_HARDLIGHT
713 /* note that this function does packing conversion and blending at the
716 gst_videomixer_blend_ayuv_i420 (guint8 * src, gint xpos, gint ypos,
717 gint src_width, gint src_height, gdouble src_alpha,
718 guint8 * dest, gint dest_width, gint dest_height)
722 guint8 *destY1, *destY2, *destU, *destV;
727 gint src_add, destY_add, destC_add;
731 src_stride = src_width * 4;
732 dest_size = dest_width * dest_height;
734 b_alpha = (gint) (src_alpha * 255);
736 /* adjust src pointers for negative sizes */
743 src += -ypos * src_stride;
747 /* adjust width/height if the src is bigger than dest */
748 if (xpos + src_width > dest_width) {
749 src_width = dest_width - xpos;
751 if (ypos + src_height > dest_height) {
752 src_height = dest_height - ypos;
755 src_add = 2 * src_stride - (4 * src_width);
756 destY_add = 2 * dest_width - (src_width);
757 destC_add = dest_width / 2 - (src_width / 2);
759 destY1 = dest + xpos + (ypos * dest_width);
760 destY2 = destY1 + dest_width;
761 destU = dest + dest_size + xpos / 2 + (ypos / 2 * dest_width / 2);
762 destV = destU + dest_size / 4;
765 src2 = src + src_stride;
767 /* we convert a square of 2x2 samples to generate 4 Luma and 2 chroma samples */
768 for (i = 0; i < src_height / 2; i++) {
769 for (j = 0; j < src_width / 2; j++) {
770 alpha = (src1[0] * b_alpha) >> 8;
771 BLEND_MODE (destY1[0], destU[0], destV[0], src1[1], src1[2], src1[3],
776 alpha = (src1[4] * b_alpha) >> 8;
777 BLEND_MODE (destY1[1], destU[0], destV[0], src1[5], src1[6], src1[7],
782 alpha = (src2[0] * b_alpha) >> 8;
783 BLEND_MODE (destY2[0], destU[0], destV[0], src2[1], src2[2], src2[3],
788 alpha = (src2[4] * b_alpha) >> 8;
789 BLEND_MODE (destY2[1], destU[0], destV[0], src2[5], src2[6], src2[7],
795 /* take the average of the 4 chroma samples to get the final value */
796 destU[0] = accumU / 4;
797 destV[0] = accumV / 4;
817 /* fill a buffer with a checkerboard pattern */
819 gst_videomixer_fill_checker (guint8 * dest, gint width, gint height)
821 gint size = width * height;
823 static int tab[] = { 80, 160, 80, 160 };
825 for (i = 0; i < height; i++) {
826 for (j = 0; j < width; j++) {
827 *dest++ = tab[((i & 0x8) >> 3) + ((j & 0x8) >> 3)];
830 memset (dest, 128, size / 2);
834 gst_videomixer_fill_color (guint8 * dest, gint width, gint height,
835 gint colY, gint colU, gint colV)
837 gint size = width * height;
839 memset (dest, colY, size);
840 memset (dest + size, colU, size / 4);
841 memset (dest + size + size / 4, colV, size / 4);
844 /* try to get a buffer on all pads. As long as the queued value is
845 * negative, we skip buffers */
847 gst_videomixer_fill_queues (GstVideoMixer * mix)
852 /* loop over all pads and fill it with a buffer */
853 walk = mix->sinkpads;
855 GstVideoMixerPad *pad = GST_VIDEO_MIXER_PAD (walk->data);
857 walk = g_slist_next (walk);
859 GST_DEBUG ("looking at pad %s", gst_pad_get_name (GST_PAD (pad)));
861 /* don't care about eos pads */
863 GST_DEBUG ("pad %s in eos, skipping", gst_pad_get_name (GST_PAD (pad)));
867 GST_DEBUG ("pad %s: buffer %p, queued %lld ",
868 gst_pad_get_name (GST_PAD (pad)), pad->buffer, pad->queued);
870 /* this pad is in need of a new buffer */
871 if (pad->buffer == NULL) {
875 /* as long as not enough buffers have been queued */
876 while (pad->queued <= 0 && !pad->eos) {
877 data = gst_pad_pull (GST_PAD (pad));
878 if (GST_IS_EVENT (data)) {
879 GstEvent *event = GST_EVENT (data);
881 switch (GST_EVENT_TYPE (event)) {
883 GST_DEBUG ("videomixer: EOS on pad %s",
884 gst_pad_get_name (GST_PAD (pad)));
887 gst_event_unref (event);
890 gst_pad_event_default (GST_PAD (pad), GST_EVENT (data));
895 buffer = GST_BUFFER (data);
896 duration = GST_BUFFER_DURATION (buffer);
897 /* no duration on the buffer, use the framerate */
899 duration = GST_SECOND / pad->in_framerate;
900 pad->queued += duration;
901 /* this buffer will need to be mixed */
902 if (pad->queued > 0) {
903 pad->buffer = buffer;
905 /* skip buffer, it's too old */
906 gst_buffer_unref (buffer);
909 GST_DEBUG ("pad %s: in loop, buffer %p, queued %lld ",
910 gst_pad_get_name (GST_PAD (pad)), pad->buffer, pad->queued);
913 if (pad->buffer != NULL) {
914 /* got a buffer somewhere so were not eos */
921 /* blend all buffers present on the pads */
923 gst_videomixer_blend_buffers (GstVideoMixer * mix, GstBuffer * outbuf)
927 walk = mix->sinkpads;
929 GstVideoMixerPad *pad = GST_VIDEO_MIXER_PAD (walk->data);
931 walk = g_slist_next (walk);
933 if (pad->buffer != NULL) {
934 gst_videomixer_blend_ayuv_i420 (GST_BUFFER_DATA (pad->buffer),
935 pad->xpos, pad->ypos,
936 pad->in_width, pad->in_height,
938 GST_BUFFER_DATA (outbuf), mix->out_width, mix->out_height);
943 /* remove buffers from the queue that were expired in the
944 * interval of the master, we also prepare the queued value
945 * in the pad so that we can skip and fill buffers later on */
947 gst_videomixer_update_queues (GstVideoMixer * mix)
952 interval = mix->master->queued;
954 interval = GST_SECOND / mix->in_framerate;
957 walk = mix->sinkpads;
959 GstVideoMixerPad *pad = GST_VIDEO_MIXER_PAD (walk->data);
961 walk = g_slist_next (walk);
963 if (pad->buffer != NULL) {
964 pad->queued -= interval;
965 GST_DEBUG ("queued now %s %lld", gst_pad_get_name (GST_PAD (pad)),
967 if (pad->queued <= 0) {
968 gst_buffer_unref (pad->buffer);
976 * The basic idea is to get a buffer on all pads and mix them together.
977 * Based on the framerate, buffers are removed from the queues to make room
981 gst_videomixer_loop (GstElement * element)
986 gint new_width, new_height;
989 mix = GST_VIDEO_MIXER (element);
991 eos = gst_videomixer_fill_queues (mix);
993 gst_pad_push (mix->srcpad, GST_DATA (gst_event_new (GST_EVENT_EOS)));
994 gst_element_set_eos (GST_ELEMENT (mix));
998 new_width = mix->in_width;
999 new_height = mix->in_height;
1001 if (new_width != mix->out_width ||
1002 new_height != mix->out_height || !GST_PAD_CAPS (mix->srcpad)) {
1006 gst_caps_copy (gst_pad_get_negotiated_caps (GST_PAD (mix->master)));
1007 gst_caps_set_simple (newcaps, "format", GST_TYPE_FOURCC,
1008 GST_STR_FOURCC ("I420"), "width", G_TYPE_INT, new_width, "height",
1009 G_TYPE_INT, new_height, NULL);
1011 if (!gst_pad_try_set_caps (mix->srcpad, newcaps)) {
1012 GST_ELEMENT_ERROR (mix, CORE, NEGOTIATION, (NULL), (NULL));
1016 mix->out_width = new_width;
1017 mix->out_height = new_height;
1020 outsize = 3 * (mix->out_width * mix->out_height) / 2;
1021 outbuf = gst_pad_alloc_buffer (mix->srcpad, GST_BUFFER_OFFSET_NONE, outsize);
1022 switch (mix->background) {
1023 case VIDEO_MIXER_BACKGROUND_CHECKER:
1024 gst_videomixer_fill_checker (GST_BUFFER_DATA (outbuf),
1025 new_width, new_height);
1027 case VIDEO_MIXER_BACKGROUND_BLACK:
1028 gst_videomixer_fill_color (GST_BUFFER_DATA (outbuf),
1029 new_width, new_height, 16, 128, 128);
1031 case VIDEO_MIXER_BACKGROUND_WHITE:
1032 gst_videomixer_fill_color (GST_BUFFER_DATA (outbuf),
1033 new_width, new_height, 240, 128, 128);
1037 gst_videomixer_blend_buffers (mix, outbuf);
1039 gst_videomixer_update_queues (mix);
1041 gst_pad_push (mix->srcpad, GST_DATA (outbuf));
1045 gst_videomixer_get_property (GObject * object,
1046 guint prop_id, GValue * value, GParamSpec * pspec)
1048 GstVideoMixer *mix = GST_VIDEO_MIXER (object);
1051 case ARG_BACKGROUND:
1052 g_value_set_enum (value, mix->background);
1055 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
1061 gst_videomixer_set_property (GObject * object,
1062 guint prop_id, const GValue * value, GParamSpec * pspec)
1064 GstVideoMixer *mix = GST_VIDEO_MIXER (object);
1067 case ARG_BACKGROUND:
1068 mix->background = g_value_get_enum (value);
1071 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
1076 static GstElementStateReturn
1077 gst_videomixer_change_state (GstElement * element)
1080 gint transition = GST_STATE_TRANSITION (element);
1082 g_return_val_if_fail (GST_IS_VIDEO_MIXER (element), GST_STATE_FAILURE);
1084 mix = GST_VIDEO_MIXER (element);
1086 switch (transition) {
1087 case GST_STATE_NULL_TO_READY:
1088 case GST_STATE_READY_TO_PAUSED:
1090 case GST_STATE_PAUSED_TO_PLAYING:
1091 case GST_STATE_PLAYING_TO_PAUSED:
1092 case GST_STATE_PAUSED_TO_READY:
1093 case GST_STATE_READY_TO_NULL:
1097 if (GST_ELEMENT_CLASS (parent_class)->change_state)
1098 return GST_ELEMENT_CLASS (parent_class)->change_state (element);
1100 return GST_STATE_SUCCESS;
1104 plugin_init (GstPlugin * plugin)
1106 GST_DEBUG_CATEGORY_INIT (gst_videomixer_debug, "videomixer", 0,
1109 return gst_element_register (plugin, "videomixer", GST_RANK_PRIMARY,
1110 GST_TYPE_VIDEO_MIXER);
1113 GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
1116 "Video mixer", plugin_init, VERSION, GST_LICENSE, GST_PACKAGE, GST_ORIGIN)