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);
167 g_atomic_int_set (&self->seeking, 0);
171 gst_image_freeze_sink_setcaps (GstPad * pad, GstCaps * caps)
173 GstImageFreeze *self = GST_IMAGE_FREEZE (gst_pad_get_parent (pad));
174 gboolean ret = FALSE;
177 GstCaps *othercaps, *intersection;
180 caps = gst_caps_make_writable (gst_caps_ref (caps));
182 GST_DEBUG_OBJECT (pad, "Setting caps: %" GST_PTR_FORMAT, caps);
184 s = gst_caps_get_structure (caps, 0);
186 /* 1. Remove framerate */
187 gst_structure_remove_field (s, "framerate");
188 gst_structure_set (s, "framerate", GST_TYPE_FRACTION_RANGE, 0, 1, G_MAXINT, 1,
191 /* 2. Intersect with template caps */
192 othercaps = (GstCaps *) gst_pad_get_pad_template_caps (pad);
193 intersection = gst_caps_intersect (caps, othercaps);
194 GST_DEBUG_OBJECT (pad, "Intersecting: %" GST_PTR_FORMAT, caps);
195 GST_DEBUG_OBJECT (pad, "with: %" GST_PTR_FORMAT, othercaps);
196 GST_DEBUG_OBJECT (pad, "gave: %" GST_PTR_FORMAT, intersection);
197 gst_caps_unref (caps);
199 intersection = othercaps = NULL;
201 /* 3. Intersect with downstream peer caps */
202 othercaps = gst_pad_peer_get_caps (self->srcpad);
204 intersection = gst_caps_intersect (caps, othercaps);
205 GST_DEBUG_OBJECT (pad, "Intersecting: %" GST_PTR_FORMAT, caps);
206 GST_DEBUG_OBJECT (pad, "with: %" GST_PTR_FORMAT, othercaps);
207 GST_DEBUG_OBJECT (pad, "gave: %" GST_PTR_FORMAT, intersection);
208 gst_caps_unref (othercaps);
209 gst_caps_unref (caps);
211 intersection = othercaps = NULL;
214 /* 4. For every candidate check if it's accepted downstream
215 * and fixate framerate to nearest 25/1 */
216 n = gst_caps_get_size (caps);
217 for (i = 0; i < n; i++) {
218 GstCaps *candidate = gst_caps_new_empty ();
219 GstStructure *s = gst_structure_copy (gst_caps_get_structure (caps, i));
221 gst_caps_append_structure (candidate, s);
222 if (gst_pad_peer_accept_caps (self->srcpad, candidate)) {
223 if (gst_structure_has_field_typed (s, "framerate", GST_TYPE_FRACTION) ||
224 gst_structure_fixate_field_nearest_fraction (s, "framerate", 25, 1)) {
225 gst_structure_get_fraction (s, "framerate", &fps_n, &fps_d);
227 GST_OBJECT_LOCK (self);
230 GST_OBJECT_UNLOCK (self);
231 GST_DEBUG_OBJECT (pad, "Setting caps %" GST_PTR_FORMAT, candidate);
232 gst_pad_set_caps (self->srcpad, candidate);
233 gst_caps_unref (candidate);
237 GST_WARNING_OBJECT (pad, "Invalid caps with framerate %d/%d", fps_n,
242 gst_caps_unref (candidate);
247 GST_ERROR_OBJECT (pad, "No usable caps found");
249 gst_caps_unref (caps);
250 gst_object_unref (self);
256 gst_image_freeze_sink_getcaps (GstPad * pad)
258 GstImageFreeze *self = GST_IMAGE_FREEZE (gst_pad_get_parent (pad));
262 if (GST_PAD_CAPS (pad)) {
263 ret = gst_caps_copy (GST_PAD_CAPS (pad));
267 tmp = gst_pad_peer_get_caps (self->srcpad);
269 ret = gst_caps_intersect (tmp, gst_pad_get_pad_template_caps (pad));
270 gst_caps_unref (tmp);
272 ret = gst_caps_copy (gst_pad_get_pad_template_caps (pad));
275 n = gst_caps_get_size (ret);
276 for (i = 0; i < n; i++) {
277 GstStructure *s = gst_caps_get_structure (ret, i);
279 gst_structure_remove_field (s, "framerate");
280 gst_structure_set (s, "framerate", GST_TYPE_FRACTION_RANGE, 0, 1, G_MAXINT,
285 gst_object_unref (self);
287 GST_LOG_OBJECT (pad, "Returning caps: %" GST_PTR_FORMAT, ret);
293 gst_image_freeze_sink_query (GstPad * pad, GstQuery * query)
295 GstImageFreeze *self = GST_IMAGE_FREEZE (gst_pad_get_parent (pad));
297 GstPad *peer = gst_pad_get_peer (self->srcpad);
299 GST_LOG_OBJECT (pad, "Handling query of type '%s'",
300 gst_query_type_get_name (GST_QUERY_TYPE (query)));
303 GST_INFO_OBJECT (pad, "No peer yet, dropping query");
306 ret = gst_pad_query (peer, query);
307 gst_object_unref (peer);
310 gst_object_unref (self);
315 gst_image_freeze_sink_bufferalloc (GstPad * pad, guint64 offset, guint size,
316 GstCaps * caps, GstBuffer ** buf)
318 GstImageFreeze *self = GST_IMAGE_FREEZE (gst_pad_get_parent (pad));
322 GST_LOG_OBJECT (pad, "Allocating buffer with offset 0x%" G_GINT64_MODIFIER
323 "x and size %u with caps: %" GST_PTR_FORMAT, offset, size, caps);
327 GST_OBJECT_LOCK (self);
328 do_alloc = self->buffer == NULL;
329 GST_OBJECT_UNLOCK (self);
332 gboolean seeking = FALSE;
335 GST_PAD_STREAM_LOCK (self->srcpad);
336 ret = gst_pad_alloc_buffer (self->srcpad, offset, size, caps, buf);
338 seeking = ret == GST_FLOW_WRONG_STATE
339 && g_atomic_int_get (&self->seeking);
340 GST_PAD_STREAM_UNLOCK (self->srcpad);
343 if (G_UNLIKELY (ret != GST_FLOW_OK))
344 GST_ERROR_OBJECT (pad, "Allocating buffer failed: %s",
345 gst_flow_get_name (ret));
347 /* Let upstream go EOS if we already have a buffer */
348 ret = GST_FLOW_UNEXPECTED;
351 gst_object_unref (self);
357 gst_image_freeze_convert (GstImageFreeze * self,
358 GstFormat src_format, gint64 src_value,
359 GstFormat * dest_format, gint64 * dest_value)
361 gboolean ret = FALSE;
363 if (src_format == *dest_format) {
364 *dest_value = src_value;
368 if (src_value == -1) {
373 switch (src_format) {
374 case GST_FORMAT_DEFAULT:{
375 switch (*dest_format) {
376 case GST_FORMAT_TIME:
377 GST_OBJECT_LOCK (self);
378 if (self->fps_n == 0)
382 gst_util_uint64_scale (src_value, GST_SECOND * self->fps_d,
384 GST_OBJECT_UNLOCK (self);
391 case GST_FORMAT_TIME:{
392 switch (*dest_format) {
393 case GST_FORMAT_DEFAULT:
394 GST_OBJECT_LOCK (self);
396 gst_util_uint64_scale (src_value, self->fps_n,
397 self->fps_d * GST_SECOND);
398 GST_OBJECT_UNLOCK (self);
413 static const GstQueryType *
414 gst_image_freeze_src_query_type (GstPad * pad)
416 static const GstQueryType types[] = {
428 gst_image_freeze_src_query (GstPad * pad, GstQuery * query)
430 GstImageFreeze *self = GST_IMAGE_FREEZE (gst_pad_get_parent (pad));
431 gboolean ret = FALSE;
433 GST_LOG_OBJECT (pad, "Handling query of type '%s'",
434 gst_query_type_get_name (GST_QUERY_TYPE (query)));
436 switch (GST_QUERY_TYPE (query)) {
437 case GST_QUERY_CONVERT:{
438 GstFormat src_format, dest_format;
439 gint64 src_value, dest_value;
441 gst_query_parse_convert (query, &src_format, &src_value, &dest_format,
444 gst_image_freeze_convert (self, src_format, src_value, &dest_format,
447 gst_query_set_convert (query, src_format, src_value, dest_format,
451 case GST_QUERY_POSITION:{
455 gst_query_parse_position (query, &format, NULL);
457 case GST_FORMAT_DEFAULT:{
458 GST_OBJECT_LOCK (self);
459 position = self->offset;
460 GST_OBJECT_UNLOCK (self);
463 case GST_FORMAT_TIME:{
464 GST_OBJECT_LOCK (self);
465 position = self->segment.last_stop;
466 GST_OBJECT_UNLOCK (self);
474 gst_query_set_position (query, format, position);
475 GST_DEBUG_OBJECT (pad,
476 "Returning position %" G_GINT64_FORMAT " in format %s", position,
477 gst_format_get_name (format));
479 GST_DEBUG_OBJECT (pad, "Position query failed");
483 case GST_QUERY_DURATION:{
487 gst_query_parse_duration (query, &format, NULL);
489 case GST_FORMAT_TIME:{
490 GST_OBJECT_LOCK (self);
491 duration = self->segment.stop;
492 GST_OBJECT_UNLOCK (self);
495 case GST_FORMAT_DEFAULT:{
496 GST_OBJECT_LOCK (self);
497 duration = self->segment.stop;
500 gst_util_uint64_scale (duration, self->fps_n,
501 GST_SECOND * self->fps_d);
502 GST_OBJECT_UNLOCK (self);
510 gst_query_set_duration (query, format, duration);
511 GST_DEBUG_OBJECT (pad,
512 "Returning duration %" G_GINT64_FORMAT " in format %s", duration,
513 gst_format_get_name (format));
515 GST_DEBUG_OBJECT (pad, "Duration query failed");
519 case GST_QUERY_SEEKING:{
523 gst_query_parse_seeking (query, &format, NULL, NULL, NULL);
524 seekable = (format == GST_FORMAT_TIME || format == GST_FORMAT_DEFAULT);
526 gst_query_set_seeking (query, format, seekable, (seekable ? 0 : -1), -1);
535 gst_object_unref (self);
541 gst_image_freeze_sink_event (GstPad * pad, GstEvent * event)
543 GstImageFreeze *self = GST_IMAGE_FREEZE (gst_pad_get_parent (pad));
546 GST_LOG_OBJECT (pad, "Got %s event", GST_EVENT_TYPE_NAME (event));
548 switch (GST_EVENT_TYPE (event)) {
550 case GST_EVENT_NEWSEGMENT:
551 GST_DEBUG_OBJECT (pad, "Dropping event");
552 gst_event_unref (event);
555 case GST_EVENT_FLUSH_START:
556 gst_image_freeze_reset (self);
559 ret = gst_pad_push_event (self->srcpad, event);
563 gst_object_unref (self);
568 gst_image_freeze_src_event (GstPad * pad, GstEvent * event)
570 GstImageFreeze *self = GST_IMAGE_FREEZE (gst_pad_get_parent (pad));
573 GST_LOG_OBJECT (pad, "Got %s event", GST_EVENT_TYPE_NAME (event));
575 switch (GST_EVENT_TYPE (event)) {
576 case GST_EVENT_NAVIGATION:
578 case GST_EVENT_LATENCY:
580 GST_DEBUG_OBJECT (pad, "Dropping event");
581 gst_event_unref (event);
584 case GST_EVENT_SEEK:{
588 GstSeekType start_type, stop_type;
594 gst_event_parse_seek (event, &rate, &format, &flags, &start_type, &start,
596 gst_event_unref (event);
598 flush = ! !(flags & GST_SEEK_FLAG_FLUSH);
600 if (format != GST_FORMAT_TIME && format != GST_FORMAT_DEFAULT) {
601 GST_ERROR_OBJECT (pad, "Seek in invalid format: %s",
602 gst_format_get_name (format));
607 if (format == GST_FORMAT_DEFAULT) {
608 format = GST_FORMAT_TIME;
609 if (!gst_image_freeze_convert (self, GST_FORMAT_DEFAULT, start, &format,
611 || !gst_image_freeze_convert (self, GST_FORMAT_DEFAULT, stop,
613 || start == -1 || stop == -1) {
614 GST_ERROR_OBJECT (pad,
615 "Failed to convert seek from DEFAULT format into TIME format");
624 g_atomic_int_set (&self->seeking, 1);
625 e = gst_event_new_flush_start ();
626 gst_pad_push_event (self->srcpad, e);
628 gst_pad_pause_task (self->srcpad);
631 GST_PAD_STREAM_LOCK (self->srcpad);
633 GST_OBJECT_LOCK (self);
634 gst_event_replace (&self->close_segment, NULL);
636 if (!self->need_segment && self->segment.rate >= 0) {
637 self->close_segment =
638 gst_event_new_new_segment_full (TRUE, self->segment.rate,
639 self->segment.applied_rate, self->segment.format,
640 self->segment.start, self->segment.last_stop, self->segment.time);
641 } else if (!self->need_segment) {
644 if ((stop = self->segment.stop) == -1)
645 stop = self->segment.duration;
647 self->close_segment =
648 gst_event_new_new_segment_full (TRUE, self->segment.rate,
649 self->segment.applied_rate, self->segment.format,
650 self->segment.last_stop, stop, self->segment.last_stop);
654 gst_segment_set_seek (&self->segment, rate, format, flags, start_type,
655 start, stop_type, stop, NULL);
656 self->need_segment = TRUE;
657 last_stop = self->segment.last_stop;
659 start_task = self->buffer != NULL;
660 GST_OBJECT_UNLOCK (self);
665 e = gst_event_new_flush_stop ();
666 gst_pad_push_event (self->srcpad, e);
667 g_atomic_int_set (&self->seeking, 0);
670 if (flags & GST_SEEK_FLAG_SEGMENT) {
673 m = gst_message_new_segment_start (GST_OBJECT (self),
675 gst_element_post_message (GST_ELEMENT (self), m);
678 GST_PAD_STREAM_UNLOCK (self->srcpad);
680 GST_DEBUG_OBJECT (pad, "Seek successful");
683 gst_pad_start_task (self->srcpad,
684 (GstTaskFunction) gst_image_freeze_src_loop, self->srcpad);
688 case GST_EVENT_FLUSH_START:
689 gst_image_freeze_reset (self);
692 ret = gst_pad_push_event (self->sinkpad, event);
696 gst_object_unref (self);
701 gst_image_freeze_sink_chain (GstPad * pad, GstBuffer * buffer)
703 GstImageFreeze *self = GST_IMAGE_FREEZE (GST_PAD_PARENT (pad));
705 GST_OBJECT_LOCK (self);
707 GST_DEBUG_OBJECT (pad, "Already have a buffer, dropping");
708 gst_buffer_unref (buffer);
709 GST_OBJECT_UNLOCK (self);
710 return GST_FLOW_UNEXPECTED;
713 self->buffer = buffer;
714 GST_OBJECT_UNLOCK (self);
716 gst_pad_start_task (self->srcpad, (GstTaskFunction) gst_image_freeze_src_loop,
722 gst_image_freeze_src_loop (GstPad * pad)
724 GstImageFreeze *self = GST_IMAGE_FREEZE (GST_PAD_PARENT (pad));
727 GstClockTime timestamp, timestamp_end, duration;
728 gint64 cstart, cstop;
729 gboolean in_seg, eos;
731 GST_OBJECT_LOCK (self);
733 GST_ERROR_OBJECT (pad, "Have no buffer yet");
734 GST_OBJECT_UNLOCK (self);
735 gst_pad_pause_task (self->srcpad);
738 buffer = gst_buffer_ref (self->buffer);
739 buffer = gst_buffer_make_metadata_writable (buffer);
740 GST_OBJECT_UNLOCK (self);
742 if (self->close_segment) {
743 GST_DEBUG_OBJECT (pad, "Closing previous segment");
744 gst_pad_push_event (self->srcpad, self->close_segment);
745 self->close_segment = NULL;
748 if (self->need_segment) {
751 GST_DEBUG_OBJECT (pad, "Pushing NEWSEGMENT event: %" GST_SEGMENT_FORMAT,
753 e = gst_event_new_new_segment_full (FALSE, self->segment.rate,
754 self->segment.applied_rate, self->segment.format, self->segment.start,
755 self->segment.stop, self->segment.start);
757 GST_OBJECT_LOCK (self);
758 if (self->segment.rate >= 0) {
760 gst_util_uint64_scale (self->segment.start, self->fps_n,
761 self->fps_d * GST_SECOND);
764 gst_util_uint64_scale (self->segment.stop, self->fps_n,
765 self->fps_d * GST_SECOND);
767 GST_OBJECT_UNLOCK (self);
769 self->need_segment = FALSE;
771 gst_pad_push_event (self->srcpad, e);
774 GST_OBJECT_LOCK (self);
775 offset = self->offset;
777 if (self->fps_n != 0) {
779 gst_util_uint64_scale (offset, self->fps_d * GST_SECOND, self->fps_n);
781 gst_util_uint64_scale (offset + 1, self->fps_d * GST_SECOND,
783 duration = timestamp_end - timestamp;
785 timestamp = self->segment.start;
786 timestamp_end = GST_CLOCK_TIME_NONE;
787 duration = GST_CLOCK_TIME_NONE;
790 eos = (self->fps_n == 0 && offset > 0) ||
791 (self->segment.rate >= 0 && self->segment.stop != -1
792 && timestamp > self->segment.stop) || (self->segment.rate < 0
793 && offset == 0) || (self->segment.rate < 0
794 && self->segment.start != -1 && timestamp_end < self->segment.start);
796 if (self->fps_n == 0 && offset > 0)
800 gst_segment_clip (&self->segment, GST_FORMAT_TIME, timestamp,
801 timestamp_end, &cstart, &cstop);
804 gst_segment_set_last_stop (&self->segment, GST_FORMAT_TIME, cstart);
806 if (self->segment.rate >= 0)
810 GST_OBJECT_UNLOCK (self);
812 GST_DEBUG_OBJECT (pad, "Handling buffer with timestamp %" GST_TIME_FORMAT,
813 GST_TIME_ARGS (timestamp));
818 GST_BUFFER_TIMESTAMP (buffer) = cstart;
819 GST_BUFFER_DURATION (buffer) = cstop - cstart;
820 GST_BUFFER_OFFSET (buffer) = offset;
821 GST_BUFFER_OFFSET_END (buffer) = offset + 1;
822 gst_buffer_set_caps (buffer, GST_PAD_CAPS (self->srcpad));
823 ret = gst_pad_push (self->srcpad, buffer);
824 GST_DEBUG_OBJECT (pad, "Pushing buffer resulted in %s",
825 gst_flow_get_name (ret));
826 if (ret != GST_FLOW_OK)
827 gst_pad_pause_task (self->srcpad);
829 gst_buffer_unref (buffer);
833 if ((self->segment.flags & GST_SEEK_FLAG_SEGMENT)) {
836 GST_DEBUG_OBJECT (pad, "Sending segment done at end of segment");
837 if (self->segment.rate >= 0)
838 m = gst_message_new_segment_done (GST_OBJECT_CAST (self),
839 GST_FORMAT_TIME, self->segment.stop);
841 m = gst_message_new_segment_done (GST_OBJECT_CAST (self),
842 GST_FORMAT_TIME, self->segment.start);
843 gst_element_post_message (GST_ELEMENT_CAST (self), m);
845 GST_DEBUG_OBJECT (pad, "Sending EOS at end of segment");
846 gst_pad_push_event (self->srcpad, gst_event_new_eos ());
848 gst_pad_pause_task (self->srcpad);
852 static GstStateChangeReturn
853 gst_image_freeze_change_state (GstElement * element, GstStateChange transition)
855 GstImageFreeze *self = GST_IMAGE_FREEZE (element);
856 GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
858 switch (transition) {
859 case GST_STATE_CHANGE_READY_TO_PAUSED:
860 gst_image_freeze_reset (self);
862 case GST_STATE_CHANGE_PAUSED_TO_READY:
863 gst_pad_stop_task (self->srcpad);
864 gst_image_freeze_reset (self);
870 if (GST_ELEMENT_CLASS (parent_class)->change_state)
871 ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
873 switch (transition) {
882 plugin_init (GstPlugin * plugin)
884 GST_DEBUG_CATEGORY_INIT (gst_image_freeze_debug, "imagefreeze", 0,
885 "imagefreeze element");
887 if (!gst_element_register (plugin, "imagefreeze", GST_RANK_NONE,
888 GST_TYPE_IMAGE_FREEZE))
894 GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
897 "Still frame stream generator",
898 plugin_init, VERSION, "LGPL", GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)