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 GstFlowReturn gst_image_freeze_sink_bufferalloc (GstPad * pad,
60 guint64 offset, guint size, GstCaps * caps, GstBuffer ** buf);
61 static void gst_image_freeze_src_loop (GstPad * pad);
62 static gboolean gst_image_freeze_src_event (GstPad * pad, GstEvent * event);
63 static gboolean gst_image_freeze_src_query (GstPad * pad, GstQuery * query);
64 static const GstQueryType *gst_image_freeze_src_query_type (GstPad * pad);
66 static GstStaticPadTemplate sink_pad_template = GST_STATIC_PAD_TEMPLATE ("sink",
69 GST_STATIC_CAPS ("video/x-raw-yuv; video/x-raw-rgb; video/x-raw-gray"));
71 static GstStaticPadTemplate src_pad_template =
72 GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
73 GST_STATIC_CAPS ("video/x-raw-yuv; video/x-raw-rgb; video/x-raw-gray"));
75 GST_DEBUG_CATEGORY_STATIC (gst_image_freeze_debug);
76 #define GST_CAT_DEFAULT gst_image_freeze_debug
78 GST_BOILERPLATE (GstImageFreeze, gst_image_freeze, GstElement,
82 gst_image_freeze_base_init (gpointer g_class)
84 GstElementClass *gstelement_class = GST_ELEMENT_CLASS (g_class);
86 gst_element_class_set_details_simple (gstelement_class,
87 "Still frame stream generator",
89 "Generates a still frame stream from an image",
90 "Sebastian Dröge <sebastian.droege@collabora.co.uk>");
92 gst_element_class_add_pad_template (gstelement_class,
93 gst_static_pad_template_get (&sink_pad_template));
94 gst_element_class_add_pad_template (gstelement_class,
95 gst_static_pad_template_get (&src_pad_template));
99 gst_image_freeze_class_init (GstImageFreezeClass * klass)
101 GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
102 GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
104 gobject_class->finalize = gst_image_freeze_finalize;
106 gstelement_class->change_state =
107 GST_DEBUG_FUNCPTR (gst_image_freeze_change_state);
111 gst_image_freeze_init (GstImageFreeze * self, GstImageFreezeClass * g_class)
113 self->sinkpad = gst_pad_new_from_static_template (&sink_pad_template, "sink");
114 gst_pad_set_chain_function (self->sinkpad,
115 GST_DEBUG_FUNCPTR (gst_image_freeze_sink_chain));
116 gst_pad_set_event_function (self->sinkpad,
117 GST_DEBUG_FUNCPTR (gst_image_freeze_sink_event));
118 gst_pad_set_query_function (self->sinkpad,
119 GST_DEBUG_FUNCPTR (gst_image_freeze_sink_query));
120 gst_pad_set_setcaps_function (self->sinkpad,
121 GST_DEBUG_FUNCPTR (gst_image_freeze_sink_setcaps));
122 gst_pad_set_getcaps_function (self->sinkpad,
123 GST_DEBUG_FUNCPTR (gst_image_freeze_sink_getcaps));
124 gst_pad_set_bufferalloc_function (self->sinkpad,
125 GST_DEBUG_FUNCPTR (gst_image_freeze_sink_bufferalloc));
126 gst_element_add_pad (GST_ELEMENT (self), self->sinkpad);
128 self->srcpad = gst_pad_new_from_static_template (&src_pad_template, "src");
129 gst_pad_set_event_function (self->srcpad,
130 GST_DEBUG_FUNCPTR (gst_image_freeze_src_event));
131 gst_pad_set_query_function (self->srcpad,
132 GST_DEBUG_FUNCPTR (gst_image_freeze_src_query));
133 gst_pad_set_query_type_function (self->srcpad,
134 GST_DEBUG_FUNCPTR (gst_image_freeze_src_query_type));
135 gst_pad_use_fixed_caps (self->srcpad);
136 gst_element_add_pad (GST_ELEMENT (self), self->srcpad);
138 gst_image_freeze_reset (self);
142 gst_image_freeze_finalize (GObject * object)
144 GstImageFreeze *self = GST_IMAGE_FREEZE (object);
146 gst_image_freeze_reset (self);
148 G_OBJECT_CLASS (parent_class)->finalize (object);
152 gst_image_freeze_reset (GstImageFreeze * self)
154 GST_DEBUG_OBJECT (self, "Resetting internal state");
156 GST_OBJECT_LOCK (self);
157 gst_buffer_replace (&self->buffer, NULL);
159 gst_segment_init (&self->segment, GST_FORMAT_TIME);
160 self->need_segment = TRUE;
161 gst_event_replace (&self->close_segment, NULL);
163 self->fps_n = self->fps_d = 0;
165 GST_OBJECT_UNLOCK (self);
169 gst_image_freeze_sink_setcaps (GstPad * pad, GstCaps * caps)
171 GstImageFreeze *self = GST_IMAGE_FREEZE (gst_pad_get_parent (pad));
172 gboolean ret = FALSE;
175 GstCaps *othercaps, *intersection;
178 caps = gst_caps_make_writable (gst_caps_ref (caps));
180 GST_DEBUG_OBJECT (pad, "Setting caps: %" GST_PTR_FORMAT, caps);
182 s = gst_caps_get_structure (caps, 0);
184 /* 1. Remove framerate */
185 gst_structure_remove_field (s, "framerate");
186 gst_structure_set (s, "framerate", GST_TYPE_FRACTION_RANGE, 0, 1, G_MAXINT, 1,
189 /* 2. Intersect with template caps */
190 othercaps = (GstCaps *) gst_pad_get_pad_template_caps (pad);
191 intersection = gst_caps_intersect (caps, othercaps);
192 GST_DEBUG_OBJECT (pad, "Intersecting: %" GST_PTR_FORMAT, caps);
193 GST_DEBUG_OBJECT (pad, "with: %" GST_PTR_FORMAT, othercaps);
194 GST_DEBUG_OBJECT (pad, "gave: %" GST_PTR_FORMAT, intersection);
195 gst_caps_unref (caps);
197 intersection = othercaps = NULL;
199 /* 3. Intersect with downstream peer caps */
200 othercaps = gst_pad_peer_get_caps (self->srcpad);
202 intersection = gst_caps_intersect (caps, othercaps);
203 GST_DEBUG_OBJECT (pad, "Intersecting: %" GST_PTR_FORMAT, caps);
204 GST_DEBUG_OBJECT (pad, "with: %" GST_PTR_FORMAT, othercaps);
205 GST_DEBUG_OBJECT (pad, "gave: %" GST_PTR_FORMAT, intersection);
206 gst_caps_unref (othercaps);
207 gst_caps_unref (caps);
209 intersection = othercaps = NULL;
212 /* 4. For every candidate check if it's accepted downstream
213 * and fixate framerate to nearest 25/1 */
214 n = gst_caps_get_size (caps);
215 for (i = 0; i < n; i++) {
216 GstCaps *candidate = gst_caps_new_empty ();
217 GstStructure *s = gst_structure_copy (gst_caps_get_structure (caps, i));
219 gst_caps_append_structure (candidate, s);
220 if (gst_pad_peer_accept_caps (self->srcpad, candidate)) {
221 if (gst_structure_has_field_typed (s, "framerate", GST_TYPE_FRACTION) ||
222 gst_structure_fixate_field_nearest_fraction (s, "framerate", 25, 1)) {
223 gst_structure_get_fraction (s, "framerate", &fps_n, &fps_d);
225 GST_OBJECT_LOCK (self);
228 GST_OBJECT_UNLOCK (self);
229 GST_DEBUG_OBJECT (pad, "Setting caps %" GST_PTR_FORMAT, candidate);
230 gst_pad_set_caps (self->srcpad, candidate);
231 gst_caps_unref (candidate);
235 GST_WARNING_OBJECT (pad, "Invalid caps with framerate %d/%d", fps_n,
240 gst_caps_unref (candidate);
245 GST_ERROR_OBJECT (pad, "No usable caps found");
247 gst_caps_unref (caps);
248 gst_object_unref (self);
254 gst_image_freeze_sink_getcaps (GstPad * pad)
256 GstImageFreeze *self = GST_IMAGE_FREEZE (gst_pad_get_parent (pad));
260 if (GST_PAD_CAPS (pad)) {
261 ret = gst_caps_copy (GST_PAD_CAPS (pad));
265 tmp = gst_pad_peer_get_caps (self->srcpad);
267 ret = gst_caps_intersect (tmp, gst_pad_get_pad_template_caps (pad));
268 gst_caps_unref (tmp);
270 ret = gst_caps_copy (gst_pad_get_pad_template_caps (pad));
273 n = gst_caps_get_size (ret);
274 for (i = 0; i < n; i++) {
275 GstStructure *s = gst_caps_get_structure (ret, i);
277 gst_structure_remove_field (s, "framerate");
278 gst_structure_set (s, "framerate", GST_TYPE_FRACTION_RANGE, 0, 1, G_MAXINT,
283 gst_object_unref (self);
285 GST_LOG_OBJECT (pad, "Returning caps: %" GST_PTR_FORMAT, ret);
291 gst_image_freeze_sink_query (GstPad * pad, GstQuery * query)
293 GstImageFreeze *self = GST_IMAGE_FREEZE (gst_pad_get_parent (pad));
295 GstPad *peer = gst_pad_get_peer (self->srcpad);
297 GST_LOG_OBJECT (pad, "Handling query of type '%s'",
298 gst_query_type_get_name (GST_QUERY_TYPE (query)));
301 GST_INFO_OBJECT (pad, "No peer yet, dropping query");
304 ret = gst_pad_query (peer, query);
305 gst_object_unref (peer);
308 gst_object_unref (self);
313 gst_image_freeze_sink_bufferalloc (GstPad * pad, guint64 offset, guint size,
314 GstCaps * caps, GstBuffer ** buf)
316 GstImageFreeze *self = GST_IMAGE_FREEZE (gst_pad_get_parent (pad));
320 GST_LOG_OBJECT (pad, "Allocating buffer with offset 0x%" G_GINT64_MODIFIER
321 "x and size %u with caps: %" GST_PTR_FORMAT, offset, size, caps);
325 GST_OBJECT_LOCK (self);
326 do_alloc = self->buffer == NULL;
327 GST_OBJECT_UNLOCK (self);
330 ret = gst_pad_alloc_buffer (self->srcpad, offset, size, caps, buf);
331 if (G_UNLIKELY (ret != GST_FLOW_OK))
332 GST_ERROR_OBJECT (pad, "Allocating buffer failed: %s",
333 gst_flow_get_name (ret));
335 /* Let upstream go EOS if we already have a buffer */
336 ret = GST_FLOW_UNEXPECTED;
339 gst_object_unref (self);
345 gst_image_freeze_convert (GstImageFreeze * self,
346 GstFormat src_format, gint64 src_value,
347 GstFormat * dest_format, gint64 * dest_value)
349 gboolean ret = FALSE;
351 if (src_format == *dest_format) {
352 *dest_value = src_value;
356 if (src_value == -1) {
361 switch (src_format) {
362 case GST_FORMAT_DEFAULT:{
363 switch (*dest_format) {
364 case GST_FORMAT_TIME:
365 GST_OBJECT_LOCK (self);
366 if (self->fps_n == 0)
370 gst_util_uint64_scale (src_value, GST_SECOND * self->fps_d,
372 GST_OBJECT_UNLOCK (self);
379 case GST_FORMAT_TIME:{
380 switch (*dest_format) {
381 case GST_FORMAT_DEFAULT:
382 GST_OBJECT_LOCK (self);
384 gst_util_uint64_scale (src_value, self->fps_n,
385 self->fps_d * GST_SECOND);
386 GST_OBJECT_UNLOCK (self);
401 static const GstQueryType *
402 gst_image_freeze_src_query_type (GstPad * pad)
404 static const GstQueryType types[] = {
416 gst_image_freeze_src_query (GstPad * pad, GstQuery * query)
418 GstImageFreeze *self = GST_IMAGE_FREEZE (gst_pad_get_parent (pad));
419 gboolean ret = FALSE;
421 GST_LOG_OBJECT (pad, "Handling query of type '%s'",
422 gst_query_type_get_name (GST_QUERY_TYPE (query)));
424 switch (GST_QUERY_TYPE (query)) {
425 case GST_QUERY_CONVERT:{
426 GstFormat src_format, dest_format;
427 gint64 src_value, dest_value;
429 gst_query_parse_convert (query, &src_format, &src_value, &dest_format,
432 gst_image_freeze_convert (self, src_format, src_value, &dest_format,
435 gst_query_set_convert (query, src_format, src_value, dest_format,
439 case GST_QUERY_POSITION:{
443 gst_query_parse_position (query, &format, NULL);
445 case GST_FORMAT_DEFAULT:{
446 GST_OBJECT_LOCK (self);
447 position = self->offset;
448 GST_OBJECT_UNLOCK (self);
451 case GST_FORMAT_TIME:{
452 GST_OBJECT_LOCK (self);
453 position = self->segment.last_stop;
454 GST_OBJECT_UNLOCK (self);
462 gst_query_set_position (query, format, position);
463 GST_DEBUG_OBJECT (pad,
464 "Returning position %" G_GINT64_FORMAT " in format %s", position,
465 gst_format_get_name (format));
467 GST_DEBUG_OBJECT (pad, "Position query failed");
471 case GST_QUERY_DURATION:{
475 gst_query_parse_duration (query, &format, NULL);
477 case GST_FORMAT_TIME:{
478 GST_OBJECT_LOCK (self);
479 duration = self->segment.stop;
480 GST_OBJECT_UNLOCK (self);
483 case GST_FORMAT_DEFAULT:{
484 GST_OBJECT_LOCK (self);
485 duration = self->segment.stop;
488 gst_util_uint64_scale (duration, self->fps_n,
489 GST_SECOND * self->fps_d);
490 GST_OBJECT_UNLOCK (self);
498 gst_query_set_duration (query, format, duration);
499 GST_DEBUG_OBJECT (pad,
500 "Returning duration %" G_GINT64_FORMAT " in format %s", duration,
501 gst_format_get_name (format));
503 GST_DEBUG_OBJECT (pad, "Duration query failed");
507 case GST_QUERY_SEEKING:{
511 gst_query_parse_seeking (query, &format, NULL, NULL, NULL);
512 seekable = (format == GST_FORMAT_TIME || format == GST_FORMAT_DEFAULT);
514 gst_query_set_seeking (query, format, seekable, (seekable ? 0 : -1), -1);
523 gst_object_unref (self);
529 gst_image_freeze_sink_event (GstPad * pad, GstEvent * event)
531 GstImageFreeze *self = GST_IMAGE_FREEZE (gst_pad_get_parent (pad));
534 GST_LOG_OBJECT (pad, "Got %s event", GST_EVENT_TYPE_NAME (event));
536 switch (GST_EVENT_TYPE (event)) {
538 case GST_EVENT_NEWSEGMENT:
539 GST_DEBUG_OBJECT (pad, "Dropping event");
540 gst_event_unref (event);
543 case GST_EVENT_FLUSH_START:
544 gst_image_freeze_reset (self);
547 ret = gst_pad_push_event (self->srcpad, event);
551 gst_object_unref (self);
556 gst_image_freeze_src_event (GstPad * pad, GstEvent * event)
558 GstImageFreeze *self = GST_IMAGE_FREEZE (gst_pad_get_parent (pad));
561 GST_LOG_OBJECT (pad, "Got %s event", GST_EVENT_TYPE_NAME (event));
563 switch (GST_EVENT_TYPE (event)) {
564 case GST_EVENT_NAVIGATION:
566 case GST_EVENT_LATENCY:
568 GST_DEBUG_OBJECT (pad, "Dropping event");
569 gst_event_unref (event);
572 case GST_EVENT_SEEK:{
576 GstSeekType start_type, stop_type;
582 gst_event_parse_seek (event, &rate, &format, &flags, &start_type, &start,
584 gst_event_unref (event);
586 flush = ! !(flags & GST_SEEK_FLAG_FLUSH);
588 if (format != GST_FORMAT_TIME && format != GST_FORMAT_DEFAULT) {
589 GST_ERROR_OBJECT (pad, "Seek in invalid format: %s",
590 gst_format_get_name (format));
595 if (format == GST_FORMAT_DEFAULT) {
596 format = GST_FORMAT_TIME;
597 if (!gst_image_freeze_convert (self, GST_FORMAT_DEFAULT, start, &format,
599 || !gst_image_freeze_convert (self, GST_FORMAT_DEFAULT, stop,
601 || start == -1 || stop == -1) {
602 GST_ERROR_OBJECT (pad,
603 "Failed to convert seek from DEFAULT format into TIME format");
612 e = gst_event_new_flush_start ();
613 gst_pad_push_event (self->srcpad, e);
615 gst_pad_pause_task (self->srcpad);
618 GST_PAD_STREAM_LOCK (self->srcpad);
620 GST_OBJECT_LOCK (self);
621 gst_event_replace (&self->close_segment, NULL);
623 if (!self->need_segment && self->segment.rate >= 0) {
624 self->close_segment =
625 gst_event_new_new_segment_full (TRUE, self->segment.rate,
626 self->segment.applied_rate, self->segment.format,
627 self->segment.start, self->segment.last_stop, self->segment.time);
628 } else if (!self->need_segment) {
631 if ((stop = self->segment.stop) == -1)
632 stop = self->segment.duration;
634 self->close_segment =
635 gst_event_new_new_segment_full (TRUE, self->segment.rate,
636 self->segment.applied_rate, self->segment.format,
637 self->segment.last_stop, stop, self->segment.last_stop);
641 gst_segment_set_seek (&self->segment, rate, format, flags, start_type,
642 start, stop_type, stop, NULL);
643 self->need_segment = TRUE;
644 last_stop = self->segment.last_stop;
646 start_task = self->buffer != NULL;
647 GST_OBJECT_UNLOCK (self);
652 e = gst_event_new_flush_stop ();
653 gst_pad_push_event (self->srcpad, e);
656 if (flags & GST_SEEK_FLAG_SEGMENT) {
659 m = gst_message_new_segment_start (GST_OBJECT (self),
661 gst_element_post_message (GST_ELEMENT (self), m);
664 GST_PAD_STREAM_UNLOCK (self->srcpad);
666 GST_DEBUG_OBJECT (pad, "Seek successful");
669 gst_pad_start_task (self->srcpad,
670 (GstTaskFunction) gst_image_freeze_src_loop, self->srcpad);
674 case GST_EVENT_FLUSH_START:
675 gst_image_freeze_reset (self);
678 ret = gst_pad_push_event (self->sinkpad, event);
682 gst_object_unref (self);
687 gst_image_freeze_sink_chain (GstPad * pad, GstBuffer * buffer)
689 GstImageFreeze *self = GST_IMAGE_FREEZE (GST_PAD_PARENT (pad));
691 GST_OBJECT_LOCK (self);
693 GST_DEBUG_OBJECT (pad, "Already have a buffer, dropping");
694 gst_buffer_unref (buffer);
695 GST_OBJECT_UNLOCK (self);
696 return GST_FLOW_UNEXPECTED;
699 self->buffer = buffer;
700 GST_OBJECT_UNLOCK (self);
702 gst_pad_start_task (self->srcpad, (GstTaskFunction) gst_image_freeze_src_loop,
708 gst_image_freeze_src_loop (GstPad * pad)
710 GstImageFreeze *self = GST_IMAGE_FREEZE (GST_PAD_PARENT (pad));
713 GstClockTime timestamp, duration;
714 gint64 cstart, cstop;
715 gboolean in_seg, eos;
717 GST_OBJECT_LOCK (self);
719 GST_ERROR_OBJECT (pad, "Have no buffer yet");
720 GST_OBJECT_UNLOCK (self);
721 gst_pad_pause_task (self->srcpad);
724 buffer = gst_buffer_ref (self->buffer);
725 buffer = gst_buffer_make_metadata_writable (buffer);
726 GST_OBJECT_UNLOCK (self);
728 if (self->close_segment) {
729 GST_DEBUG_OBJECT (pad, "Closing previous segment");
730 gst_pad_push_event (self->srcpad, self->close_segment);
731 self->close_segment = NULL;
734 if (self->need_segment) {
737 GST_DEBUG_OBJECT (pad, "Pushing NEWSEGMENT event: %" GST_SEGMENT_FORMAT,
739 e = gst_event_new_new_segment_full (FALSE, self->segment.rate,
740 self->segment.applied_rate, self->segment.format, self->segment.start,
741 self->segment.stop, self->segment.start);
743 GST_OBJECT_LOCK (self);
744 if (self->segment.rate >= 0) {
746 gst_util_uint64_scale (self->segment.start, self->fps_n,
747 self->fps_d * GST_SECOND);
750 gst_util_uint64_scale (self->segment.stop, self->fps_n,
751 self->fps_d * GST_SECOND);
753 GST_OBJECT_UNLOCK (self);
755 self->need_segment = FALSE;
757 gst_pad_push_event (self->srcpad, e);
760 GST_OBJECT_LOCK (self);
761 offset = self->offset;
763 if (self->fps_n != 0) {
765 gst_util_uint64_scale (offset, self->fps_d * GST_SECOND, self->fps_n);
766 duration = gst_util_uint64_scale_int (GST_SECOND, self->fps_d, self->fps_n);
768 timestamp = self->segment.start;
769 duration = GST_CLOCK_TIME_NONE;
771 eos = (self->fps_n == 0 && offset > 0) ||
772 (self->segment.rate >= 0 && self->segment.stop != -1
773 && timestamp > self->segment.stop) || (self->segment.rate < 0
774 && offset == 0) || (self->segment.rate < 0
775 && self->segment.start != -1
776 && timestamp + duration < self->segment.start);
778 if (self->fps_n == 0 && offset > 0)
782 gst_segment_clip (&self->segment, GST_FORMAT_TIME, timestamp,
783 timestamp + duration, &cstart, &cstop);
786 gst_segment_set_last_stop (&self->segment, GST_FORMAT_TIME, cstart);
788 if (self->segment.rate >= 0)
792 GST_OBJECT_UNLOCK (self);
794 GST_DEBUG_OBJECT (pad, "Handling buffer with timestamp %" GST_TIME_FORMAT,
795 GST_TIME_ARGS (timestamp));
800 GST_BUFFER_TIMESTAMP (buffer) = cstart;
801 GST_BUFFER_DURATION (buffer) = cstop - cstart;
802 GST_BUFFER_OFFSET (buffer) = offset;
803 GST_BUFFER_OFFSET_END (buffer) = offset + 1;
804 gst_buffer_set_caps (buffer, GST_PAD_CAPS (self->srcpad));
805 ret = gst_pad_push (self->srcpad, buffer);
806 GST_DEBUG_OBJECT (pad, "Pushing buffer resulted in %s",
807 gst_flow_get_name (ret));
808 if (ret != GST_FLOW_OK)
809 gst_pad_pause_task (self->srcpad);
811 gst_buffer_unref (buffer);
815 if ((self->segment.flags & GST_SEEK_FLAG_SEGMENT)) {
818 GST_DEBUG_OBJECT (pad, "Sending segment done at end of segment");
819 if (self->segment.rate >= 0)
820 m = gst_message_new_segment_done (GST_OBJECT_CAST (self),
821 GST_FORMAT_TIME, self->segment.stop);
823 m = gst_message_new_segment_done (GST_OBJECT_CAST (self),
824 GST_FORMAT_TIME, self->segment.start);
825 gst_element_post_message (GST_ELEMENT_CAST (self), m);
827 GST_DEBUG_OBJECT (pad, "Sending EOS at end of segment");
828 gst_pad_push_event (self->srcpad, gst_event_new_eos ());
830 gst_pad_pause_task (self->srcpad);
834 static GstStateChangeReturn
835 gst_image_freeze_change_state (GstElement * element, GstStateChange transition)
837 GstImageFreeze *self = GST_IMAGE_FREEZE (element);
838 GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
840 switch (transition) {
841 case GST_STATE_CHANGE_READY_TO_PAUSED:
842 gst_image_freeze_reset (self);
844 case GST_STATE_CHANGE_PAUSED_TO_READY:
845 gst_pad_stop_task (self->srcpad);
846 gst_image_freeze_reset (self);
852 if (GST_ELEMENT_CLASS (parent_class)->change_state)
853 ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
855 switch (transition) {
864 plugin_init (GstPlugin * plugin)
866 GST_DEBUG_CATEGORY_INIT (gst_image_freeze_debug, "imagefreeze", 0,
867 "imagefreeze element");
869 if (!gst_element_register (plugin, "imagefreeze", GST_RANK_NONE,
870 GST_TYPE_IMAGE_FREEZE))
876 GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
879 "Still frame stream generator",
880 plugin_init, VERSION, "LGPL", GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)