2 * Copyright (c) 2005 Edward Hervey <bilboed@bilboed.com>
3 * Copyright (C) 2010 Sebastian Dröge <sebastian.droege@collabora.co.uk>
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Library General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Library General Public License for more details.
15 * You should have received a copy of the GNU Library General Public
16 * License along with this library; if not, write to the
17 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 * Boston, MA 02111-1307, USA.
22 * SECTION:element-imagefreeze
24 * The imagefreeze element generates a still frame video stream from
25 * the input. It duplicates the first frame with the framerate requested
26 * by downstream, allows seeking and answers queries.
29 * <title>Example launch line</title>
31 * gst-launch -v filesrc location=some.png ! decodebin2 ! imagefreeze ! autovideosink
32 * ]| This pipeline shows a still frame stream of a PNG file.
36 /* This is based on the imagefreeze element from PiTiVi:
37 * http://git.gnome.org/browse/pitivi/tree/pitivi/elements/imagefreeze.py
44 #include "gstimagefreeze.h"
46 static void gst_image_freeze_finalize (GObject * object);
48 static void gst_image_freeze_reset (GstImageFreeze * self);
50 static GstStateChangeReturn gst_image_freeze_change_state (GstElement * element,
51 GstStateChange transition);
53 static GstFlowReturn gst_image_freeze_sink_chain (GstPad * pad,
55 static gboolean gst_image_freeze_sink_event (GstPad * pad, GstEvent * event);
56 static gboolean gst_image_freeze_sink_setcaps (GstPad * pad, GstCaps * caps);
57 static GstCaps *gst_image_freeze_sink_getcaps (GstPad * pad);
58 static gboolean gst_image_freeze_sink_query (GstPad * pad, GstQuery * query);
59 static void gst_image_freeze_src_loop (GstPad * pad);
60 static gboolean gst_image_freeze_src_event (GstPad * pad, GstEvent * event);
61 static gboolean gst_image_freeze_src_query (GstPad * pad, GstQuery * query);
62 static const GstQueryType *gst_image_freeze_src_query_type (GstPad * pad);
64 static GstStaticPadTemplate sink_pad_template = GST_STATIC_PAD_TEMPLATE ("sink",
67 GST_STATIC_CAPS ("video/x-raw-yuv; video/x-raw-rgb; video/x-raw-gray"));
69 static GstStaticPadTemplate src_pad_template =
70 GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
71 GST_STATIC_CAPS ("video/x-raw-yuv; video/x-raw-rgb; video/x-raw-gray"));
73 GST_DEBUG_CATEGORY_STATIC (gst_image_freeze_debug);
74 #define GST_CAT_DEFAULT gst_image_freeze_debug
76 GST_BOILERPLATE (GstImageFreeze, gst_image_freeze, GstElement,
80 gst_image_freeze_base_init (gpointer g_class)
82 GstElementClass *gstelement_class = GST_ELEMENT_CLASS (g_class);
84 gst_element_class_set_details_simple (gstelement_class,
85 "Still frame stream generator",
87 "Generates a still frame stream from an image",
88 "Sebastian Dröge <sebastian.droege@collabora.co.uk>");
90 gst_element_class_add_pad_template (gstelement_class,
91 gst_static_pad_template_get (&sink_pad_template));
92 gst_element_class_add_pad_template (gstelement_class,
93 gst_static_pad_template_get (&src_pad_template));
97 gst_image_freeze_class_init (GstImageFreezeClass * klass)
99 GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
100 GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
102 gobject_class->finalize = gst_image_freeze_finalize;
104 gstelement_class->change_state =
105 GST_DEBUG_FUNCPTR (gst_image_freeze_change_state);
109 gst_image_freeze_init (GstImageFreeze * self, GstImageFreezeClass * g_class)
111 self->sinkpad = gst_pad_new_from_static_template (&sink_pad_template, "sink");
112 gst_pad_set_chain_function (self->sinkpad,
113 GST_DEBUG_FUNCPTR (gst_image_freeze_sink_chain));
114 gst_pad_set_event_function (self->sinkpad,
115 GST_DEBUG_FUNCPTR (gst_image_freeze_sink_event));
116 gst_pad_set_query_function (self->sinkpad,
117 GST_DEBUG_FUNCPTR (gst_image_freeze_sink_query));
118 gst_pad_set_setcaps_function (self->sinkpad,
119 GST_DEBUG_FUNCPTR (gst_image_freeze_sink_setcaps));
120 gst_pad_set_getcaps_function (self->sinkpad,
121 GST_DEBUG_FUNCPTR (gst_image_freeze_sink_getcaps));
122 gst_element_add_pad (GST_ELEMENT (self), self->sinkpad);
124 self->srcpad = gst_pad_new_from_static_template (&src_pad_template, "src");
125 gst_pad_set_event_function (self->srcpad,
126 GST_DEBUG_FUNCPTR (gst_image_freeze_src_event));
127 gst_pad_set_query_function (self->srcpad,
128 GST_DEBUG_FUNCPTR (gst_image_freeze_src_query));
129 gst_pad_set_query_type_function (self->srcpad,
130 GST_DEBUG_FUNCPTR (gst_image_freeze_src_query_type));
131 gst_pad_use_fixed_caps (self->srcpad);
132 gst_element_add_pad (GST_ELEMENT (self), self->srcpad);
134 gst_image_freeze_reset (self);
138 gst_image_freeze_finalize (GObject * object)
140 GstImageFreeze *self = GST_IMAGE_FREEZE (object);
142 gst_image_freeze_reset (self);
144 G_OBJECT_CLASS (parent_class)->finalize (object);
148 gst_image_freeze_reset (GstImageFreeze * self)
150 GST_DEBUG_OBJECT (self, "Resetting internal state");
152 GST_OBJECT_LOCK (self);
153 gst_buffer_replace (&self->buffer, NULL);
155 gst_segment_init (&self->segment, GST_FORMAT_TIME);
156 self->need_segment = TRUE;
157 gst_event_replace (&self->close_segment, NULL);
159 self->fps_n = self->fps_d = 0;
161 GST_OBJECT_UNLOCK (self);
165 gst_image_freeze_sink_setcaps (GstPad * pad, GstCaps * caps)
167 GstImageFreeze *self = GST_IMAGE_FREEZE (gst_pad_get_parent (pad));
168 gboolean ret = FALSE;
171 GstCaps *othercaps, *intersection;
174 caps = gst_caps_make_writable (gst_caps_ref (caps));
176 GST_DEBUG_OBJECT (pad, "Setting caps: %" GST_PTR_FORMAT, caps);
178 s = gst_caps_get_structure (caps, 0);
180 /* 1. Remove framerate */
181 gst_structure_remove_field (s, "framerate");
182 gst_structure_set (s, "framerate", GST_TYPE_FRACTION_RANGE, 0, 1, G_MAXINT, 1,
185 /* 2. Intersect with template caps */
186 othercaps = (GstCaps *) gst_pad_get_pad_template_caps (pad);
187 intersection = gst_caps_intersect (caps, othercaps);
188 GST_DEBUG_OBJECT (pad, "Intersecting: %" GST_PTR_FORMAT, caps);
189 GST_DEBUG_OBJECT (pad, "with: %" GST_PTR_FORMAT, othercaps);
190 GST_DEBUG_OBJECT (pad, "gave: %" GST_PTR_FORMAT, intersection);
191 gst_caps_unref (caps);
193 intersection = othercaps = NULL;
195 /* 3. Intersect with downstream peer caps */
196 othercaps = gst_pad_peer_get_caps (self->srcpad);
198 intersection = gst_caps_intersect (caps, othercaps);
199 GST_DEBUG_OBJECT (pad, "Intersecting: %" GST_PTR_FORMAT, caps);
200 GST_DEBUG_OBJECT (pad, "with: %" GST_PTR_FORMAT, othercaps);
201 GST_DEBUG_OBJECT (pad, "gave: %" GST_PTR_FORMAT, intersection);
202 gst_caps_unref (othercaps);
203 gst_caps_unref (caps);
205 intersection = othercaps = NULL;
208 /* 4. For every candidate check if it's accepted downstream
209 * and fixate framerate to nearest 25/1 */
210 n = gst_caps_get_size (caps);
211 for (i = 0; i < n; i++) {
212 GstCaps *candidate = gst_caps_new_empty ();
213 GstStructure *s = gst_structure_copy (gst_caps_get_structure (caps, i));
215 gst_caps_append_structure (candidate, s);
216 if (gst_pad_peer_accept_caps (self->srcpad, candidate)) {
217 if (gst_structure_has_field_typed (s, "framerate", GST_TYPE_FRACTION) ||
218 gst_structure_fixate_field_nearest_fraction (s, "framerate", 25, 1)) {
219 gst_structure_get_fraction (s, "framerate", &fps_n, &fps_d);
221 GST_OBJECT_LOCK (self);
224 GST_OBJECT_UNLOCK (self);
225 GST_DEBUG_OBJECT (pad, "Setting caps %" GST_PTR_FORMAT, candidate);
226 gst_pad_set_caps (self->srcpad, candidate);
227 gst_caps_unref (candidate);
231 GST_WARNING_OBJECT (pad, "Invalid caps with framerate %d/%d", fps_n,
236 gst_caps_unref (candidate);
241 GST_ERROR_OBJECT (pad, "No usable caps found");
243 gst_caps_unref (caps);
244 gst_object_unref (self);
250 gst_image_freeze_sink_getcaps (GstPad * pad)
252 GstImageFreeze *self = GST_IMAGE_FREEZE (gst_pad_get_parent (pad));
256 if (GST_PAD_CAPS (pad)) {
257 ret = gst_caps_copy (GST_PAD_CAPS (pad));
261 tmp = gst_pad_peer_get_caps (self->srcpad);
263 ret = gst_caps_intersect (tmp, gst_pad_get_pad_template_caps (pad));
264 gst_caps_unref (tmp);
266 ret = gst_caps_copy (gst_pad_get_pad_template_caps (pad));
269 n = gst_caps_get_size (ret);
270 for (i = 0; i < n; i++) {
271 GstStructure *s = gst_caps_get_structure (ret, i);
273 gst_structure_remove_field (s, "framerate");
274 gst_structure_set (s, "framerate", GST_TYPE_FRACTION_RANGE, 0, 1, G_MAXINT,
279 gst_object_unref (self);
281 GST_LOG_OBJECT (pad, "Returning caps: %" GST_PTR_FORMAT, ret);
287 gst_image_freeze_sink_query (GstPad * pad, GstQuery * query)
289 GstImageFreeze *self = GST_IMAGE_FREEZE (gst_pad_get_parent (pad));
291 GstPad *peer = gst_pad_get_peer (self->srcpad);
293 GST_LOG_OBJECT (pad, "Handling query of type '%s'",
294 gst_query_type_get_name (GST_QUERY_TYPE (query)));
297 GST_INFO_OBJECT (pad, "No peer yet, dropping query");
300 ret = gst_pad_query (peer, query);
301 gst_object_unref (peer);
304 gst_object_unref (self);
309 gst_image_freeze_convert (GstImageFreeze * self,
310 GstFormat src_format, gint64 src_value,
311 GstFormat * dest_format, gint64 * dest_value)
313 gboolean ret = FALSE;
315 if (src_format == *dest_format) {
316 *dest_value = src_value;
320 if (src_value == -1) {
325 switch (src_format) {
326 case GST_FORMAT_DEFAULT:{
327 switch (*dest_format) {
328 case GST_FORMAT_TIME:
329 GST_OBJECT_LOCK (self);
330 if (self->fps_n == 0)
334 gst_util_uint64_scale (src_value, GST_SECOND * self->fps_d,
336 GST_OBJECT_UNLOCK (self);
343 case GST_FORMAT_TIME:{
344 switch (*dest_format) {
345 case GST_FORMAT_DEFAULT:
346 GST_OBJECT_LOCK (self);
348 gst_util_uint64_scale (src_value, self->fps_n,
349 self->fps_d * GST_SECOND);
350 GST_OBJECT_UNLOCK (self);
365 static const GstQueryType *
366 gst_image_freeze_src_query_type (GstPad * pad)
368 static const GstQueryType types[] = {
380 gst_image_freeze_src_query (GstPad * pad, GstQuery * query)
382 GstImageFreeze *self = GST_IMAGE_FREEZE (gst_pad_get_parent (pad));
383 gboolean ret = FALSE;
385 GST_LOG_OBJECT (pad, "Handling query of type '%s'",
386 gst_query_type_get_name (GST_QUERY_TYPE (query)));
388 switch (GST_QUERY_TYPE (query)) {
389 case GST_QUERY_CONVERT:{
390 GstFormat src_format, dest_format;
391 gint64 src_value, dest_value;
393 gst_query_parse_convert (query, &src_format, &src_value, &dest_format,
396 gst_image_freeze_convert (self, src_format, src_value, &dest_format,
399 gst_query_set_convert (query, src_format, src_value, dest_format,
403 case GST_QUERY_POSITION:{
407 gst_query_parse_position (query, &format, NULL);
409 case GST_FORMAT_DEFAULT:{
410 GST_OBJECT_LOCK (self);
411 position = self->offset;
412 GST_OBJECT_UNLOCK (self);
415 case GST_FORMAT_TIME:{
416 GST_OBJECT_LOCK (self);
417 position = self->segment.last_stop;
418 GST_OBJECT_UNLOCK (self);
426 gst_query_set_position (query, format, position);
427 GST_DEBUG_OBJECT (pad,
428 "Returning position %" G_GINT64_FORMAT " in format %s", position,
429 gst_format_get_name (format));
431 GST_DEBUG_OBJECT (pad, "Position query failed");
435 case GST_QUERY_DURATION:{
439 gst_query_parse_duration (query, &format, NULL);
441 case GST_FORMAT_TIME:{
442 GST_OBJECT_LOCK (self);
443 duration = self->segment.stop;
444 GST_OBJECT_UNLOCK (self);
447 case GST_FORMAT_DEFAULT:{
448 GST_OBJECT_LOCK (self);
449 duration = self->segment.stop;
452 gst_util_uint64_scale (duration, self->fps_n,
453 GST_SECOND * self->fps_d);
454 GST_OBJECT_UNLOCK (self);
462 gst_query_set_duration (query, format, duration);
463 GST_DEBUG_OBJECT (pad,
464 "Returning duration %" G_GINT64_FORMAT " in format %s", duration,
465 gst_format_get_name (format));
467 GST_DEBUG_OBJECT (pad, "Duration query failed");
471 case GST_QUERY_SEEKING:{
475 gst_query_parse_seeking (query, &format, NULL, NULL, NULL);
476 seekable = (format == GST_FORMAT_TIME || format == GST_FORMAT_DEFAULT);
478 gst_query_set_seeking (query, format, seekable, (seekable ? 0 : -1), -1);
487 gst_object_unref (self);
493 gst_image_freeze_sink_event (GstPad * pad, GstEvent * event)
495 GstImageFreeze *self = GST_IMAGE_FREEZE (gst_pad_get_parent (pad));
498 GST_LOG_OBJECT (pad, "Got %s event", GST_EVENT_TYPE_NAME (event));
500 switch (GST_EVENT_TYPE (event)) {
502 case GST_EVENT_NEWSEGMENT:
503 GST_DEBUG_OBJECT (pad, "Dropping event");
504 gst_event_unref (event);
507 case GST_EVENT_FLUSH_START:
508 gst_image_freeze_reset (self);
511 ret = gst_pad_push_event (self->srcpad, event);
515 gst_object_unref (self);
520 gst_image_freeze_src_event (GstPad * pad, GstEvent * event)
522 GstImageFreeze *self = GST_IMAGE_FREEZE (gst_pad_get_parent (pad));
525 GST_LOG_OBJECT (pad, "Got %s event", GST_EVENT_TYPE_NAME (event));
527 switch (GST_EVENT_TYPE (event)) {
528 case GST_EVENT_NAVIGATION:
530 case GST_EVENT_LATENCY:
532 GST_DEBUG_OBJECT (pad, "Dropping event");
533 gst_event_unref (event);
536 case GST_EVENT_SEEK:{
540 GstSeekType start_type, stop_type;
545 gst_event_parse_seek (event, &rate, &format, &flags, &start_type, &start,
547 gst_event_unref (event);
549 if (format != GST_FORMAT_TIME && format != GST_FORMAT_DEFAULT) {
550 GST_ERROR_OBJECT (pad, "Seek in invalid format: %s",
551 gst_format_get_name (format));
556 if (format == GST_FORMAT_DEFAULT) {
557 format = GST_FORMAT_TIME;
558 if (!gst_image_freeze_convert (self, GST_FORMAT_DEFAULT, start, &format,
560 || !gst_image_freeze_convert (self, GST_FORMAT_DEFAULT, stop,
562 || start == -1 || stop == -1) {
563 GST_ERROR_OBJECT (pad,
564 "Failed to convert seek from DEFAULT format into TIME format");
570 if ((flags & GST_SEEK_FLAG_FLUSH)) {
573 e = gst_event_new_flush_start ();
574 gst_pad_push_event (self->srcpad, e);
576 gst_pad_pause_task (self->srcpad);
579 GST_PAD_STREAM_LOCK (self->srcpad);
581 GST_OBJECT_LOCK (self);
582 gst_event_replace (&self->close_segment, NULL);
583 if (self->segment.rate >= 0) {
584 self->close_segment =
585 gst_event_new_new_segment_full (TRUE, self->segment.rate,
586 self->segment.applied_rate, self->segment.format,
587 self->segment.start, self->segment.last_stop, self->segment.time);
591 if ((stop = self->segment.stop) == -1)
592 stop = self->segment.duration;
594 self->close_segment =
595 gst_event_new_new_segment_full (TRUE, self->segment.rate,
596 self->segment.applied_rate, self->segment.format,
597 self->segment.last_stop, stop, self->segment.last_stop);
600 gst_segment_set_seek (&self->segment, rate, format, flags, start_type,
601 start, stop_type, stop, NULL);
602 self->need_segment = TRUE;
603 last_stop = self->segment.last_stop;
605 start_task = self->buffer != NULL;
606 GST_OBJECT_UNLOCK (self);
608 if ((flags & GST_SEEK_FLAG_FLUSH)) {
611 e = gst_event_new_flush_stop ();
612 gst_pad_push_event (self->srcpad, e);
615 if (flags & GST_SEEK_FLAG_SEGMENT) {
618 m = gst_message_new_segment_start (GST_OBJECT (self),
620 gst_element_post_message (GST_ELEMENT (self), m);
623 GST_PAD_STREAM_UNLOCK (self->srcpad);
625 GST_DEBUG_OBJECT (pad, "Seek successful");
628 gst_pad_start_task (self->srcpad,
629 (GstTaskFunction) gst_image_freeze_src_loop, self->srcpad);
633 case GST_EVENT_FLUSH_START:
634 gst_image_freeze_reset (self);
637 ret = gst_pad_push_event (self->sinkpad, event);
641 gst_object_unref (self);
646 gst_image_freeze_sink_chain (GstPad * pad, GstBuffer * buffer)
648 GstImageFreeze *self = GST_IMAGE_FREEZE (GST_PAD_PARENT (pad));
649 GstFlowReturn ret = GST_FLOW_OK;
651 GST_OBJECT_LOCK (self);
653 GST_DEBUG_OBJECT (pad, "Already have a buffer, dropping");
654 gst_buffer_unref (buffer);
655 GST_OBJECT_UNLOCK (self);
659 self->buffer = buffer;
660 GST_OBJECT_UNLOCK (self);
662 gst_pad_start_task (self->srcpad, (GstTaskFunction) gst_image_freeze_src_loop,
668 gst_image_freeze_src_loop (GstPad * pad)
670 GstImageFreeze *self = GST_IMAGE_FREEZE (GST_PAD_PARENT (pad));
673 GstClockTime timestamp, duration;
674 gint64 cstart, cstop;
675 gboolean in_seg, eos;
677 GST_OBJECT_LOCK (self);
679 GST_ERROR_OBJECT (pad, "Have no buffer yet");
680 GST_OBJECT_UNLOCK (self);
681 gst_pad_pause_task (self->srcpad);
684 buffer = gst_buffer_ref (self->buffer);
685 buffer = gst_buffer_make_metadata_writable (buffer);
686 GST_OBJECT_UNLOCK (self);
688 if (self->close_segment) {
689 GST_DEBUG_OBJECT (pad, "Closing previous segment");
690 gst_pad_push_event (self->srcpad, self->close_segment);
691 self->close_segment = NULL;
694 if (self->need_segment) {
697 GST_DEBUG_OBJECT (pad, "Pushing NEWSEGMENT event: %" GST_SEGMENT_FORMAT,
699 e = gst_event_new_new_segment_full (FALSE, self->segment.rate,
700 self->segment.applied_rate, self->segment.format, self->segment.start,
701 self->segment.stop, self->segment.start);
703 GST_OBJECT_LOCK (self);
704 if (self->segment.rate >= 0) {
706 gst_util_uint64_scale (self->segment.start, self->fps_n,
707 self->fps_d * GST_SECOND);
710 gst_util_uint64_scale (self->segment.stop, self->fps_n,
711 self->fps_d * GST_SECOND);
713 GST_OBJECT_UNLOCK (self);
715 self->need_segment = FALSE;
717 gst_pad_push_event (self->srcpad, e);
720 GST_OBJECT_LOCK (self);
721 offset = self->offset;
723 if (self->fps_n != 0) {
725 gst_util_uint64_scale (offset, self->fps_d * GST_SECOND, self->fps_n);
726 duration = gst_util_uint64_scale_int (GST_SECOND, self->fps_d, self->fps_n);
728 timestamp = self->segment.start;
729 duration = GST_CLOCK_TIME_NONE;
731 eos = (self->fps_n == 0 && offset > 0) ||
732 (self->segment.rate >= 0 && self->segment.stop != -1
733 && timestamp > self->segment.stop) || (self->segment.rate < 0
734 && offset == 0) || (self->segment.rate < 0
735 && self->segment.start != -1
736 && timestamp + duration < self->segment.start);
738 if (self->fps_n == 0 && offset > 0)
742 gst_segment_clip (&self->segment, GST_FORMAT_TIME, timestamp,
743 timestamp + duration, &cstart, &cstop);
746 gst_segment_set_last_stop (&self->segment, GST_FORMAT_TIME, cstart);
748 if (self->segment.rate >= 0)
752 GST_OBJECT_UNLOCK (self);
754 GST_DEBUG_OBJECT (pad, "Handling buffer with timestamp %" GST_TIME_FORMAT,
755 GST_TIME_ARGS (timestamp));
760 GST_BUFFER_TIMESTAMP (buffer) = cstart;
761 GST_BUFFER_DURATION (buffer) = cstop - cstart;
762 GST_BUFFER_OFFSET (buffer) = offset;
763 GST_BUFFER_OFFSET_END (buffer) = offset + 1;
764 gst_buffer_set_caps (buffer, GST_PAD_CAPS (self->srcpad));
765 ret = gst_pad_push (self->srcpad, buffer);
766 GST_DEBUG_OBJECT (pad, "Pushing buffer resulted in %s",
767 gst_flow_get_name (ret));
768 if (ret != GST_FLOW_OK)
769 gst_pad_pause_task (self->srcpad);
771 gst_buffer_unref (buffer);
775 if ((self->segment.flags & GST_SEEK_FLAG_SEGMENT)) {
778 GST_DEBUG_OBJECT (pad, "Sending segment done at end of segment");
779 if (self->segment.rate >= 0)
780 m = gst_message_new_segment_done (GST_OBJECT_CAST (self),
781 GST_FORMAT_TIME, self->segment.stop);
783 m = gst_message_new_segment_done (GST_OBJECT_CAST (self),
784 GST_FORMAT_TIME, self->segment.start);
785 gst_element_post_message (GST_ELEMENT_CAST (self), m);
787 GST_DEBUG_OBJECT (pad, "Sending EOS at end of segment");
788 gst_pad_push_event (self->srcpad, gst_event_new_eos ());
790 gst_pad_pause_task (self->srcpad);
794 static GstStateChangeReturn
795 gst_image_freeze_change_state (GstElement * element, GstStateChange transition)
797 GstImageFreeze *self = GST_IMAGE_FREEZE (element);
798 GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
800 switch (transition) {
801 case GST_STATE_CHANGE_READY_TO_PAUSED:
802 gst_image_freeze_reset (self);
804 case GST_STATE_CHANGE_PAUSED_TO_READY:
805 gst_pad_stop_task (self->srcpad);
806 gst_image_freeze_reset (self);
812 if (GST_ELEMENT_CLASS (parent_class)->change_state)
813 ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
815 switch (transition) {
824 plugin_init (GstPlugin * plugin)
826 GST_DEBUG_CATEGORY_INIT (gst_image_freeze_debug, "imagefreeze", 0,
827 "imagefreeze element");
829 if (!gst_element_register (plugin, "imagefreeze", GST_RANK_NONE,
830 GST_TYPE_IMAGE_FREEZE))
836 GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
839 "Still frame stream generator",
840 plugin_init, VERSION, "LGPL", GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)