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);
333 ret = gst_pad_alloc_buffer (self->srcpad, offset, size, caps, buf);
334 } while (ret == GST_FLOW_WRONG_STATE && g_atomic_int_get (&self->seeking));
336 if (G_UNLIKELY (ret != GST_FLOW_OK))
337 GST_ERROR_OBJECT (pad, "Allocating buffer failed: %s",
338 gst_flow_get_name (ret));
340 /* Let upstream go EOS if we already have a buffer */
341 ret = GST_FLOW_UNEXPECTED;
344 gst_object_unref (self);
350 gst_image_freeze_convert (GstImageFreeze * self,
351 GstFormat src_format, gint64 src_value,
352 GstFormat * dest_format, gint64 * dest_value)
354 gboolean ret = FALSE;
356 if (src_format == *dest_format) {
357 *dest_value = src_value;
361 if (src_value == -1) {
366 switch (src_format) {
367 case GST_FORMAT_DEFAULT:{
368 switch (*dest_format) {
369 case GST_FORMAT_TIME:
370 GST_OBJECT_LOCK (self);
371 if (self->fps_n == 0)
375 gst_util_uint64_scale (src_value, GST_SECOND * self->fps_d,
377 GST_OBJECT_UNLOCK (self);
384 case GST_FORMAT_TIME:{
385 switch (*dest_format) {
386 case GST_FORMAT_DEFAULT:
387 GST_OBJECT_LOCK (self);
389 gst_util_uint64_scale (src_value, self->fps_n,
390 self->fps_d * GST_SECOND);
391 GST_OBJECT_UNLOCK (self);
406 static const GstQueryType *
407 gst_image_freeze_src_query_type (GstPad * pad)
409 static const GstQueryType types[] = {
421 gst_image_freeze_src_query (GstPad * pad, GstQuery * query)
423 GstImageFreeze *self = GST_IMAGE_FREEZE (gst_pad_get_parent (pad));
424 gboolean ret = FALSE;
426 GST_LOG_OBJECT (pad, "Handling query of type '%s'",
427 gst_query_type_get_name (GST_QUERY_TYPE (query)));
429 switch (GST_QUERY_TYPE (query)) {
430 case GST_QUERY_CONVERT:{
431 GstFormat src_format, dest_format;
432 gint64 src_value, dest_value;
434 gst_query_parse_convert (query, &src_format, &src_value, &dest_format,
437 gst_image_freeze_convert (self, src_format, src_value, &dest_format,
440 gst_query_set_convert (query, src_format, src_value, dest_format,
444 case GST_QUERY_POSITION:{
448 gst_query_parse_position (query, &format, NULL);
450 case GST_FORMAT_DEFAULT:{
451 GST_OBJECT_LOCK (self);
452 position = self->offset;
453 GST_OBJECT_UNLOCK (self);
456 case GST_FORMAT_TIME:{
457 GST_OBJECT_LOCK (self);
458 position = self->segment.last_stop;
459 GST_OBJECT_UNLOCK (self);
467 gst_query_set_position (query, format, position);
468 GST_DEBUG_OBJECT (pad,
469 "Returning position %" G_GINT64_FORMAT " in format %s", position,
470 gst_format_get_name (format));
472 GST_DEBUG_OBJECT (pad, "Position query failed");
476 case GST_QUERY_DURATION:{
480 gst_query_parse_duration (query, &format, NULL);
482 case GST_FORMAT_TIME:{
483 GST_OBJECT_LOCK (self);
484 duration = self->segment.stop;
485 GST_OBJECT_UNLOCK (self);
488 case GST_FORMAT_DEFAULT:{
489 GST_OBJECT_LOCK (self);
490 duration = self->segment.stop;
493 gst_util_uint64_scale (duration, self->fps_n,
494 GST_SECOND * self->fps_d);
495 GST_OBJECT_UNLOCK (self);
503 gst_query_set_duration (query, format, duration);
504 GST_DEBUG_OBJECT (pad,
505 "Returning duration %" G_GINT64_FORMAT " in format %s", duration,
506 gst_format_get_name (format));
508 GST_DEBUG_OBJECT (pad, "Duration query failed");
512 case GST_QUERY_SEEKING:{
516 gst_query_parse_seeking (query, &format, NULL, NULL, NULL);
517 seekable = (format == GST_FORMAT_TIME || format == GST_FORMAT_DEFAULT);
519 gst_query_set_seeking (query, format, seekable, (seekable ? 0 : -1), -1);
528 gst_object_unref (self);
534 gst_image_freeze_sink_event (GstPad * pad, GstEvent * event)
536 GstImageFreeze *self = GST_IMAGE_FREEZE (gst_pad_get_parent (pad));
539 GST_LOG_OBJECT (pad, "Got %s event", GST_EVENT_TYPE_NAME (event));
541 switch (GST_EVENT_TYPE (event)) {
543 case GST_EVENT_NEWSEGMENT:
544 GST_DEBUG_OBJECT (pad, "Dropping event");
545 gst_event_unref (event);
548 case GST_EVENT_FLUSH_START:
549 gst_image_freeze_reset (self);
552 ret = gst_pad_push_event (self->srcpad, event);
556 gst_object_unref (self);
561 gst_image_freeze_src_event (GstPad * pad, GstEvent * event)
563 GstImageFreeze *self = GST_IMAGE_FREEZE (gst_pad_get_parent (pad));
566 GST_LOG_OBJECT (pad, "Got %s event", GST_EVENT_TYPE_NAME (event));
568 switch (GST_EVENT_TYPE (event)) {
569 case GST_EVENT_NAVIGATION:
571 case GST_EVENT_LATENCY:
573 GST_DEBUG_OBJECT (pad, "Dropping event");
574 gst_event_unref (event);
577 case GST_EVENT_SEEK:{
581 GstSeekType start_type, stop_type;
587 gst_event_parse_seek (event, &rate, &format, &flags, &start_type, &start,
589 gst_event_unref (event);
591 flush = ! !(flags & GST_SEEK_FLAG_FLUSH);
593 if (format != GST_FORMAT_TIME && format != GST_FORMAT_DEFAULT) {
594 GST_ERROR_OBJECT (pad, "Seek in invalid format: %s",
595 gst_format_get_name (format));
600 if (format == GST_FORMAT_DEFAULT) {
601 format = GST_FORMAT_TIME;
602 if (!gst_image_freeze_convert (self, GST_FORMAT_DEFAULT, start, &format,
604 || !gst_image_freeze_convert (self, GST_FORMAT_DEFAULT, stop,
606 || start == -1 || stop == -1) {
607 GST_ERROR_OBJECT (pad,
608 "Failed to convert seek from DEFAULT format into TIME format");
617 g_atomic_int_set (&self->seeking, 1);
618 e = gst_event_new_flush_start ();
619 gst_pad_push_event (self->srcpad, e);
621 gst_pad_pause_task (self->srcpad);
624 GST_PAD_STREAM_LOCK (self->srcpad);
626 GST_OBJECT_LOCK (self);
627 gst_event_replace (&self->close_segment, NULL);
629 if (!self->need_segment && self->segment.rate >= 0) {
630 self->close_segment =
631 gst_event_new_new_segment_full (TRUE, self->segment.rate,
632 self->segment.applied_rate, self->segment.format,
633 self->segment.start, self->segment.last_stop, self->segment.time);
634 } else if (!self->need_segment) {
637 if ((stop = self->segment.stop) == -1)
638 stop = self->segment.duration;
640 self->close_segment =
641 gst_event_new_new_segment_full (TRUE, self->segment.rate,
642 self->segment.applied_rate, self->segment.format,
643 self->segment.last_stop, stop, self->segment.last_stop);
647 gst_segment_set_seek (&self->segment, rate, format, flags, start_type,
648 start, stop_type, stop, NULL);
649 self->need_segment = TRUE;
650 last_stop = self->segment.last_stop;
652 start_task = self->buffer != NULL;
653 GST_OBJECT_UNLOCK (self);
658 e = gst_event_new_flush_stop ();
659 gst_pad_push_event (self->srcpad, e);
660 g_atomic_int_set (&self->seeking, 0);
663 if (flags & GST_SEEK_FLAG_SEGMENT) {
666 m = gst_message_new_segment_start (GST_OBJECT (self),
668 gst_element_post_message (GST_ELEMENT (self), m);
671 GST_PAD_STREAM_UNLOCK (self->srcpad);
673 GST_DEBUG_OBJECT (pad, "Seek successful");
676 gst_pad_start_task (self->srcpad,
677 (GstTaskFunction) gst_image_freeze_src_loop, self->srcpad);
681 case GST_EVENT_FLUSH_START:
682 gst_image_freeze_reset (self);
685 ret = gst_pad_push_event (self->sinkpad, event);
689 gst_object_unref (self);
694 gst_image_freeze_sink_chain (GstPad * pad, GstBuffer * buffer)
696 GstImageFreeze *self = GST_IMAGE_FREEZE (GST_PAD_PARENT (pad));
698 GST_OBJECT_LOCK (self);
700 GST_DEBUG_OBJECT (pad, "Already have a buffer, dropping");
701 gst_buffer_unref (buffer);
702 GST_OBJECT_UNLOCK (self);
703 return GST_FLOW_UNEXPECTED;
706 self->buffer = buffer;
707 GST_OBJECT_UNLOCK (self);
709 gst_pad_start_task (self->srcpad, (GstTaskFunction) gst_image_freeze_src_loop,
715 gst_image_freeze_src_loop (GstPad * pad)
717 GstImageFreeze *self = GST_IMAGE_FREEZE (GST_PAD_PARENT (pad));
720 GstClockTime timestamp, timestamp_end, duration;
721 gint64 cstart, cstop;
722 gboolean in_seg, eos;
724 GST_OBJECT_LOCK (self);
726 GST_ERROR_OBJECT (pad, "Have no buffer yet");
727 GST_OBJECT_UNLOCK (self);
728 gst_pad_pause_task (self->srcpad);
731 buffer = gst_buffer_ref (self->buffer);
732 buffer = gst_buffer_make_metadata_writable (buffer);
733 GST_OBJECT_UNLOCK (self);
735 if (self->close_segment) {
736 GST_DEBUG_OBJECT (pad, "Closing previous segment");
737 gst_pad_push_event (self->srcpad, self->close_segment);
738 self->close_segment = NULL;
741 if (self->need_segment) {
744 GST_DEBUG_OBJECT (pad, "Pushing NEWSEGMENT event: %" GST_SEGMENT_FORMAT,
746 e = gst_event_new_new_segment_full (FALSE, self->segment.rate,
747 self->segment.applied_rate, self->segment.format, self->segment.start,
748 self->segment.stop, self->segment.start);
750 GST_OBJECT_LOCK (self);
751 if (self->segment.rate >= 0) {
753 gst_util_uint64_scale (self->segment.start, self->fps_n,
754 self->fps_d * GST_SECOND);
757 gst_util_uint64_scale (self->segment.stop, self->fps_n,
758 self->fps_d * GST_SECOND);
760 GST_OBJECT_UNLOCK (self);
762 self->need_segment = FALSE;
764 gst_pad_push_event (self->srcpad, e);
767 GST_OBJECT_LOCK (self);
768 offset = self->offset;
770 if (self->fps_n != 0) {
772 gst_util_uint64_scale (offset, self->fps_d * GST_SECOND, self->fps_n);
774 gst_util_uint64_scale (offset + 1, self->fps_d * GST_SECOND,
776 duration = timestamp_end - timestamp;
778 timestamp = self->segment.start;
779 timestamp_end = GST_CLOCK_TIME_NONE;
780 duration = GST_CLOCK_TIME_NONE;
783 eos = (self->fps_n == 0 && offset > 0) ||
784 (self->segment.rate >= 0 && self->segment.stop != -1
785 && timestamp > self->segment.stop) || (self->segment.rate < 0
786 && offset == 0) || (self->segment.rate < 0
787 && self->segment.start != -1 && timestamp_end < self->segment.start);
789 if (self->fps_n == 0 && offset > 0)
793 gst_segment_clip (&self->segment, GST_FORMAT_TIME, timestamp,
794 timestamp_end, &cstart, &cstop);
797 gst_segment_set_last_stop (&self->segment, GST_FORMAT_TIME, cstart);
799 if (self->segment.rate >= 0)
803 GST_OBJECT_UNLOCK (self);
805 GST_DEBUG_OBJECT (pad, "Handling buffer with timestamp %" GST_TIME_FORMAT,
806 GST_TIME_ARGS (timestamp));
811 GST_BUFFER_TIMESTAMP (buffer) = cstart;
812 GST_BUFFER_DURATION (buffer) = cstop - cstart;
813 GST_BUFFER_OFFSET (buffer) = offset;
814 GST_BUFFER_OFFSET_END (buffer) = offset + 1;
815 gst_buffer_set_caps (buffer, GST_PAD_CAPS (self->srcpad));
816 ret = gst_pad_push (self->srcpad, buffer);
817 GST_DEBUG_OBJECT (pad, "Pushing buffer resulted in %s",
818 gst_flow_get_name (ret));
819 if (ret != GST_FLOW_OK)
820 gst_pad_pause_task (self->srcpad);
822 gst_buffer_unref (buffer);
826 if ((self->segment.flags & GST_SEEK_FLAG_SEGMENT)) {
829 GST_DEBUG_OBJECT (pad, "Sending segment done at end of segment");
830 if (self->segment.rate >= 0)
831 m = gst_message_new_segment_done (GST_OBJECT_CAST (self),
832 GST_FORMAT_TIME, self->segment.stop);
834 m = gst_message_new_segment_done (GST_OBJECT_CAST (self),
835 GST_FORMAT_TIME, self->segment.start);
836 gst_element_post_message (GST_ELEMENT_CAST (self), m);
838 GST_DEBUG_OBJECT (pad, "Sending EOS at end of segment");
839 gst_pad_push_event (self->srcpad, gst_event_new_eos ());
841 gst_pad_pause_task (self->srcpad);
845 static GstStateChangeReturn
846 gst_image_freeze_change_state (GstElement * element, GstStateChange transition)
848 GstImageFreeze *self = GST_IMAGE_FREEZE (element);
849 GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
851 switch (transition) {
852 case GST_STATE_CHANGE_READY_TO_PAUSED:
853 gst_image_freeze_reset (self);
855 case GST_STATE_CHANGE_PAUSED_TO_READY:
856 gst_pad_stop_task (self->srcpad);
857 gst_image_freeze_reset (self);
863 if (GST_ELEMENT_CLASS (parent_class)->change_state)
864 ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
866 switch (transition) {
875 plugin_init (GstPlugin * plugin)
877 GST_DEBUG_CATEGORY_INIT (gst_image_freeze_debug, "imagefreeze", 0,
878 "imagefreeze element");
880 if (!gst_element_register (plugin, "imagefreeze", GST_RANK_NONE,
881 GST_TYPE_IMAGE_FREEZE))
887 GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
890 "Still frame stream generator",
891 plugin_init, VERSION, "LGPL", GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)