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 self->lock = g_mutex_new ();
140 gst_image_freeze_reset (self);
144 gst_image_freeze_finalize (GObject * object)
146 GstImageFreeze *self = GST_IMAGE_FREEZE (object);
148 gst_image_freeze_reset (self);
151 g_mutex_free (self->lock);
154 G_OBJECT_CLASS (parent_class)->finalize (object);
158 gst_image_freeze_reset (GstImageFreeze * self)
160 GST_DEBUG_OBJECT (self, "Resetting internal state");
162 g_mutex_lock (self->lock);
163 gst_buffer_replace (&self->buffer, NULL);
165 gst_segment_init (&self->segment, GST_FORMAT_TIME);
166 self->need_segment = TRUE;
167 gst_event_replace (&self->close_segment, NULL);
169 self->fps_n = self->fps_d = 0;
171 g_mutex_unlock (self->lock);
173 g_atomic_int_set (&self->seeking, 0);
177 gst_image_freeze_sink_setcaps (GstPad * pad, GstCaps * caps)
179 GstImageFreeze *self = GST_IMAGE_FREEZE (gst_pad_get_parent (pad));
180 gboolean ret = FALSE;
183 GstCaps *othercaps, *intersection;
186 caps = gst_caps_make_writable (gst_caps_ref (caps));
188 GST_DEBUG_OBJECT (pad, "Setting caps: %" GST_PTR_FORMAT, caps);
190 s = gst_caps_get_structure (caps, 0);
192 /* 1. Remove framerate */
193 gst_structure_remove_field (s, "framerate");
194 gst_structure_set (s, "framerate", GST_TYPE_FRACTION_RANGE, 0, 1, G_MAXINT, 1,
197 /* 2. Intersect with template caps */
198 othercaps = (GstCaps *) gst_pad_get_pad_template_caps (pad);
199 intersection = gst_caps_intersect (caps, othercaps);
200 GST_DEBUG_OBJECT (pad, "Intersecting: %" GST_PTR_FORMAT, caps);
201 GST_DEBUG_OBJECT (pad, "with: %" GST_PTR_FORMAT, othercaps);
202 GST_DEBUG_OBJECT (pad, "gave: %" GST_PTR_FORMAT, intersection);
203 gst_caps_unref (caps);
205 intersection = othercaps = NULL;
207 /* 3. Intersect with downstream peer caps */
208 othercaps = gst_pad_peer_get_caps (self->srcpad);
210 intersection = gst_caps_intersect (caps, othercaps);
211 GST_DEBUG_OBJECT (pad, "Intersecting: %" GST_PTR_FORMAT, caps);
212 GST_DEBUG_OBJECT (pad, "with: %" GST_PTR_FORMAT, othercaps);
213 GST_DEBUG_OBJECT (pad, "gave: %" GST_PTR_FORMAT, intersection);
214 gst_caps_unref (othercaps);
215 gst_caps_unref (caps);
217 intersection = othercaps = NULL;
220 /* 4. For every candidate check if it's accepted downstream
221 * and fixate framerate to nearest 25/1 */
222 n = gst_caps_get_size (caps);
223 for (i = 0; i < n; i++) {
224 GstCaps *candidate = gst_caps_new_empty ();
225 GstStructure *s = gst_structure_copy (gst_caps_get_structure (caps, i));
227 gst_caps_append_structure (candidate, s);
228 if (gst_pad_peer_accept_caps (self->srcpad, candidate)) {
229 if (gst_structure_has_field_typed (s, "framerate", GST_TYPE_FRACTION) ||
230 gst_structure_fixate_field_nearest_fraction (s, "framerate", 25, 1)) {
231 gst_structure_get_fraction (s, "framerate", &fps_n, &fps_d);
233 g_mutex_lock (self->lock);
236 g_mutex_unlock (self->lock);
237 GST_DEBUG_OBJECT (pad, "Setting caps %" GST_PTR_FORMAT, candidate);
238 gst_pad_set_caps (self->srcpad, candidate);
239 gst_caps_unref (candidate);
243 GST_WARNING_OBJECT (pad, "Invalid caps with framerate %d/%d", fps_n,
248 gst_caps_unref (candidate);
253 GST_ERROR_OBJECT (pad, "No usable caps found");
255 gst_caps_unref (caps);
256 gst_object_unref (self);
262 gst_image_freeze_sink_getcaps (GstPad * pad)
264 GstImageFreeze *self = GST_IMAGE_FREEZE (gst_pad_get_parent (pad));
268 if (GST_PAD_CAPS (pad)) {
269 ret = gst_caps_copy (GST_PAD_CAPS (pad));
273 tmp = gst_pad_peer_get_caps (self->srcpad);
275 ret = gst_caps_intersect (tmp, gst_pad_get_pad_template_caps (pad));
276 gst_caps_unref (tmp);
278 ret = gst_caps_copy (gst_pad_get_pad_template_caps (pad));
281 n = gst_caps_get_size (ret);
282 for (i = 0; i < n; i++) {
283 GstStructure *s = gst_caps_get_structure (ret, i);
285 gst_structure_remove_field (s, "framerate");
286 gst_structure_set (s, "framerate", GST_TYPE_FRACTION_RANGE, 0, 1, G_MAXINT,
291 gst_object_unref (self);
293 GST_LOG_OBJECT (pad, "Returning caps: %" GST_PTR_FORMAT, ret);
299 gst_image_freeze_sink_query (GstPad * pad, GstQuery * query)
301 GstImageFreeze *self = GST_IMAGE_FREEZE (gst_pad_get_parent (pad));
303 GstPad *peer = gst_pad_get_peer (self->srcpad);
305 GST_LOG_OBJECT (pad, "Handling query of type '%s'",
306 gst_query_type_get_name (GST_QUERY_TYPE (query)));
309 GST_INFO_OBJECT (pad, "No peer yet, dropping query");
312 ret = gst_pad_query (peer, query);
313 gst_object_unref (peer);
316 gst_object_unref (self);
321 gst_image_freeze_sink_bufferalloc (GstPad * pad, guint64 offset, guint size,
322 GstCaps * caps, GstBuffer ** buf)
324 GstImageFreeze *self = GST_IMAGE_FREEZE (gst_pad_get_parent (pad));
328 GST_LOG_OBJECT (pad, "Allocating buffer with offset 0x%" G_GINT64_MODIFIER
329 "x and size %u with caps: %" GST_PTR_FORMAT, offset, size, caps);
333 g_mutex_lock (self->lock);
334 do_alloc = self->buffer == NULL;
335 g_mutex_unlock (self->lock);
338 gboolean seeking = FALSE;
341 GST_PAD_STREAM_LOCK (self->srcpad);
342 ret = gst_pad_alloc_buffer (self->srcpad, offset, size, caps, buf);
344 seeking = ret == GST_FLOW_WRONG_STATE
345 && g_atomic_int_get (&self->seeking);
346 GST_PAD_STREAM_UNLOCK (self->srcpad);
349 if (G_UNLIKELY (ret != GST_FLOW_OK))
350 GST_ERROR_OBJECT (pad, "Allocating buffer failed: %s",
351 gst_flow_get_name (ret));
353 /* Let upstream go EOS if we already have a buffer */
354 ret = GST_FLOW_UNEXPECTED;
357 gst_object_unref (self);
363 gst_image_freeze_convert (GstImageFreeze * self,
364 GstFormat src_format, gint64 src_value,
365 GstFormat * dest_format, gint64 * dest_value)
367 gboolean ret = FALSE;
369 if (src_format == *dest_format) {
370 *dest_value = src_value;
374 if (src_value == -1) {
379 switch (src_format) {
380 case GST_FORMAT_DEFAULT:{
381 switch (*dest_format) {
382 case GST_FORMAT_TIME:
383 g_mutex_lock (self->lock);
384 if (self->fps_n == 0)
388 gst_util_uint64_scale (src_value, GST_SECOND * self->fps_d,
390 g_mutex_unlock (self->lock);
397 case GST_FORMAT_TIME:{
398 switch (*dest_format) {
399 case GST_FORMAT_DEFAULT:
400 g_mutex_lock (self->lock);
402 gst_util_uint64_scale (src_value, self->fps_n,
403 self->fps_d * GST_SECOND);
404 g_mutex_unlock (self->lock);
419 static const GstQueryType *
420 gst_image_freeze_src_query_type (GstPad * pad)
422 static const GstQueryType types[] = {
434 gst_image_freeze_src_query (GstPad * pad, GstQuery * query)
436 GstImageFreeze *self = GST_IMAGE_FREEZE (gst_pad_get_parent (pad));
437 gboolean ret = FALSE;
439 GST_LOG_OBJECT (pad, "Handling query of type '%s'",
440 gst_query_type_get_name (GST_QUERY_TYPE (query)));
442 switch (GST_QUERY_TYPE (query)) {
443 case GST_QUERY_CONVERT:{
444 GstFormat src_format, dest_format;
445 gint64 src_value, dest_value;
447 gst_query_parse_convert (query, &src_format, &src_value, &dest_format,
450 gst_image_freeze_convert (self, src_format, src_value, &dest_format,
453 gst_query_set_convert (query, src_format, src_value, dest_format,
457 case GST_QUERY_POSITION:{
461 gst_query_parse_position (query, &format, NULL);
463 case GST_FORMAT_DEFAULT:{
464 g_mutex_lock (self->lock);
465 position = self->offset;
466 g_mutex_unlock (self->lock);
469 case GST_FORMAT_TIME:{
470 g_mutex_lock (self->lock);
471 position = self->segment.last_stop;
472 g_mutex_unlock (self->lock);
480 gst_query_set_position (query, format, position);
481 GST_DEBUG_OBJECT (pad,
482 "Returning position %" G_GINT64_FORMAT " in format %s", position,
483 gst_format_get_name (format));
485 GST_DEBUG_OBJECT (pad, "Position query failed");
489 case GST_QUERY_DURATION:{
493 gst_query_parse_duration (query, &format, NULL);
495 case GST_FORMAT_TIME:{
496 g_mutex_lock (self->lock);
497 duration = self->segment.stop;
498 g_mutex_unlock (self->lock);
501 case GST_FORMAT_DEFAULT:{
502 g_mutex_lock (self->lock);
503 duration = self->segment.stop;
506 gst_util_uint64_scale (duration, self->fps_n,
507 GST_SECOND * self->fps_d);
508 g_mutex_unlock (self->lock);
516 gst_query_set_duration (query, format, duration);
517 GST_DEBUG_OBJECT (pad,
518 "Returning duration %" G_GINT64_FORMAT " in format %s", duration,
519 gst_format_get_name (format));
521 GST_DEBUG_OBJECT (pad, "Duration query failed");
525 case GST_QUERY_SEEKING:{
529 gst_query_parse_seeking (query, &format, NULL, NULL, NULL);
530 seekable = (format == GST_FORMAT_TIME || format == GST_FORMAT_DEFAULT);
532 gst_query_set_seeking (query, format, seekable, (seekable ? 0 : -1), -1);
541 gst_object_unref (self);
547 gst_image_freeze_sink_event (GstPad * pad, GstEvent * event)
549 GstImageFreeze *self = GST_IMAGE_FREEZE (gst_pad_get_parent (pad));
552 GST_LOG_OBJECT (pad, "Got %s event", GST_EVENT_TYPE_NAME (event));
554 switch (GST_EVENT_TYPE (event)) {
556 case GST_EVENT_NEWSEGMENT:
557 GST_DEBUG_OBJECT (pad, "Dropping event");
558 gst_event_unref (event);
561 case GST_EVENT_FLUSH_START:
562 gst_image_freeze_reset (self);
565 ret = gst_pad_push_event (self->srcpad, event);
569 gst_object_unref (self);
574 gst_image_freeze_src_event (GstPad * pad, GstEvent * event)
576 GstImageFreeze *self = GST_IMAGE_FREEZE (gst_pad_get_parent (pad));
579 GST_LOG_OBJECT (pad, "Got %s event", GST_EVENT_TYPE_NAME (event));
581 switch (GST_EVENT_TYPE (event)) {
582 case GST_EVENT_NAVIGATION:
584 case GST_EVENT_LATENCY:
586 GST_DEBUG_OBJECT (pad, "Dropping event");
587 gst_event_unref (event);
590 case GST_EVENT_SEEK:{
594 GstSeekType start_type, stop_type;
600 gst_event_parse_seek (event, &rate, &format, &flags, &start_type, &start,
602 gst_event_unref (event);
604 flush = ! !(flags & GST_SEEK_FLAG_FLUSH);
606 if (format != GST_FORMAT_TIME && format != GST_FORMAT_DEFAULT) {
607 GST_ERROR_OBJECT (pad, "Seek in invalid format: %s",
608 gst_format_get_name (format));
613 if (format == GST_FORMAT_DEFAULT) {
614 format = GST_FORMAT_TIME;
615 if (!gst_image_freeze_convert (self, GST_FORMAT_DEFAULT, start, &format,
617 || !gst_image_freeze_convert (self, GST_FORMAT_DEFAULT, stop,
619 || start == -1 || stop == -1) {
620 GST_ERROR_OBJECT (pad,
621 "Failed to convert seek from DEFAULT format into TIME format");
630 g_atomic_int_set (&self->seeking, 1);
631 e = gst_event_new_flush_start ();
632 gst_pad_push_event (self->srcpad, e);
634 gst_pad_pause_task (self->srcpad);
637 GST_PAD_STREAM_LOCK (self->srcpad);
639 g_mutex_lock (self->lock);
640 gst_event_replace (&self->close_segment, NULL);
642 if (!self->need_segment && self->segment.rate >= 0) {
643 self->close_segment =
644 gst_event_new_new_segment_full (TRUE, self->segment.rate,
645 self->segment.applied_rate, self->segment.format,
646 self->segment.start, self->segment.last_stop, self->segment.time);
647 } else if (!self->need_segment) {
650 if ((stop = self->segment.stop) == -1)
651 stop = self->segment.duration;
653 self->close_segment =
654 gst_event_new_new_segment_full (TRUE, self->segment.rate,
655 self->segment.applied_rate, self->segment.format,
656 self->segment.last_stop, stop, self->segment.last_stop);
660 gst_segment_set_seek (&self->segment, rate, format, flags, start_type,
661 start, stop_type, stop, NULL);
662 self->need_segment = TRUE;
663 last_stop = self->segment.last_stop;
665 start_task = self->buffer != NULL;
666 g_mutex_unlock (self->lock);
671 e = gst_event_new_flush_stop ();
672 gst_pad_push_event (self->srcpad, e);
673 g_atomic_int_set (&self->seeking, 0);
676 if (flags & GST_SEEK_FLAG_SEGMENT) {
679 m = gst_message_new_segment_start (GST_OBJECT (self),
681 gst_element_post_message (GST_ELEMENT (self), m);
684 GST_PAD_STREAM_UNLOCK (self->srcpad);
686 GST_DEBUG_OBJECT (pad, "Seek successful");
689 g_mutex_lock (self->lock);
691 if (self->buffer != NULL)
692 gst_pad_start_task (self->srcpad,
693 (GstTaskFunction) gst_image_freeze_src_loop, self->srcpad);
695 g_mutex_unlock (self->lock);
701 case GST_EVENT_FLUSH_START:
702 gst_image_freeze_reset (self);
705 ret = gst_pad_push_event (self->sinkpad, event);
709 gst_object_unref (self);
714 gst_image_freeze_sink_chain (GstPad * pad, GstBuffer * buffer)
716 GstImageFreeze *self = GST_IMAGE_FREEZE (GST_PAD_PARENT (pad));
718 g_mutex_lock (self->lock);
720 GST_DEBUG_OBJECT (pad, "Already have a buffer, dropping");
721 gst_buffer_unref (buffer);
722 g_mutex_unlock (self->lock);
723 return GST_FLOW_UNEXPECTED;
726 self->buffer = buffer;
728 gst_pad_start_task (self->srcpad, (GstTaskFunction) gst_image_freeze_src_loop,
730 g_mutex_unlock (self->lock);
735 gst_image_freeze_src_loop (GstPad * pad)
737 GstImageFreeze *self = GST_IMAGE_FREEZE (GST_PAD_PARENT (pad));
740 GstClockTime timestamp, timestamp_end, duration;
741 gint64 cstart, cstop;
742 gboolean in_seg, eos;
744 g_mutex_lock (self->lock);
746 GST_ERROR_OBJECT (pad, "Have no buffer yet");
747 g_mutex_unlock (self->lock);
748 gst_pad_pause_task (self->srcpad);
751 buffer = gst_buffer_ref (self->buffer);
752 buffer = gst_buffer_make_metadata_writable (buffer);
753 g_mutex_unlock (self->lock);
755 if (self->close_segment) {
756 GST_DEBUG_OBJECT (pad, "Closing previous segment");
757 gst_pad_push_event (self->srcpad, self->close_segment);
758 self->close_segment = NULL;
761 if (self->need_segment) {
764 GST_DEBUG_OBJECT (pad, "Pushing NEWSEGMENT event: %" GST_SEGMENT_FORMAT,
766 e = gst_event_new_new_segment_full (FALSE, self->segment.rate,
767 self->segment.applied_rate, self->segment.format, self->segment.start,
768 self->segment.stop, self->segment.start);
770 g_mutex_lock (self->lock);
771 if (self->segment.rate >= 0) {
773 gst_util_uint64_scale (self->segment.start, self->fps_n,
774 self->fps_d * GST_SECOND);
777 gst_util_uint64_scale (self->segment.stop, self->fps_n,
778 self->fps_d * GST_SECOND);
780 g_mutex_unlock (self->lock);
782 self->need_segment = FALSE;
784 gst_pad_push_event (self->srcpad, e);
787 g_mutex_lock (self->lock);
788 offset = self->offset;
790 if (self->fps_n != 0) {
792 gst_util_uint64_scale (offset, self->fps_d * GST_SECOND, self->fps_n);
794 gst_util_uint64_scale (offset + 1, self->fps_d * GST_SECOND,
796 duration = timestamp_end - timestamp;
798 timestamp = self->segment.start;
799 timestamp_end = GST_CLOCK_TIME_NONE;
800 duration = GST_CLOCK_TIME_NONE;
803 eos = (self->fps_n == 0 && offset > 0) ||
804 (self->segment.rate >= 0 && self->segment.stop != -1
805 && timestamp > self->segment.stop) || (self->segment.rate < 0
806 && offset == 0) || (self->segment.rate < 0
807 && self->segment.start != -1 && timestamp_end < self->segment.start);
809 if (self->fps_n == 0 && offset > 0)
813 gst_segment_clip (&self->segment, GST_FORMAT_TIME, timestamp,
814 timestamp_end, &cstart, &cstop);
817 gst_segment_set_last_stop (&self->segment, GST_FORMAT_TIME, cstart);
819 if (self->segment.rate >= 0)
823 g_mutex_unlock (self->lock);
825 GST_DEBUG_OBJECT (pad, "Handling buffer with timestamp %" GST_TIME_FORMAT,
826 GST_TIME_ARGS (timestamp));
831 GST_BUFFER_TIMESTAMP (buffer) = cstart;
832 GST_BUFFER_DURATION (buffer) = cstop - cstart;
833 GST_BUFFER_OFFSET (buffer) = offset;
834 GST_BUFFER_OFFSET_END (buffer) = offset + 1;
835 gst_buffer_set_caps (buffer, GST_PAD_CAPS (self->srcpad));
836 ret = gst_pad_push (self->srcpad, buffer);
837 GST_DEBUG_OBJECT (pad, "Pushing buffer resulted in %s",
838 gst_flow_get_name (ret));
839 if (ret != GST_FLOW_OK)
840 gst_pad_pause_task (self->srcpad);
842 gst_buffer_unref (buffer);
846 if ((self->segment.flags & GST_SEEK_FLAG_SEGMENT)) {
849 GST_DEBUG_OBJECT (pad, "Sending segment done at end of segment");
850 if (self->segment.rate >= 0)
851 m = gst_message_new_segment_done (GST_OBJECT_CAST (self),
852 GST_FORMAT_TIME, self->segment.stop);
854 m = gst_message_new_segment_done (GST_OBJECT_CAST (self),
855 GST_FORMAT_TIME, self->segment.start);
856 gst_element_post_message (GST_ELEMENT_CAST (self), m);
858 GST_DEBUG_OBJECT (pad, "Sending EOS at end of segment");
859 gst_pad_push_event (self->srcpad, gst_event_new_eos ());
861 gst_pad_pause_task (self->srcpad);
865 static GstStateChangeReturn
866 gst_image_freeze_change_state (GstElement * element, GstStateChange transition)
868 GstImageFreeze *self = GST_IMAGE_FREEZE (element);
869 GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
871 switch (transition) {
872 case GST_STATE_CHANGE_READY_TO_PAUSED:
873 gst_image_freeze_reset (self);
875 case GST_STATE_CHANGE_PAUSED_TO_READY:
876 gst_pad_stop_task (self->srcpad);
877 gst_image_freeze_reset (self);
883 if (GST_ELEMENT_CLASS (parent_class)->change_state)
884 ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
886 switch (transition) {
895 plugin_init (GstPlugin * plugin)
897 GST_DEBUG_CATEGORY_INIT (gst_image_freeze_debug, "imagefreeze", 0,
898 "imagefreeze element");
900 if (!gst_element_register (plugin, "imagefreeze", GST_RANK_NONE,
901 GST_TYPE_IMAGE_FREEZE))
907 GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
910 "Still frame stream generator",
911 plugin_init, VERSION, "LGPL", GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)