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., 51 Franklin St, Fifth Floor,
18 * Boston, MA 02110-1301, 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-1.0 -v filesrc location=some.png ! decodebin ! 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 <gst/glib-compat-private.h>
46 #include "gstimagefreeze.h"
48 #define DEFAULT_NUM_BUFFERS -1
56 static void gst_image_freeze_finalize (GObject * object);
58 static void gst_image_freeze_reset (GstImageFreeze * self);
60 static GstStateChangeReturn gst_image_freeze_change_state (GstElement * element,
61 GstStateChange transition);
63 static void gst_image_freeze_set_property (GObject * object, guint prop_id,
64 const GValue * value, GParamSpec * pspec);
65 static void gst_image_freeze_get_property (GObject * object, guint prop_id,
66 GValue * value, GParamSpec * pspec);
67 static GstFlowReturn gst_image_freeze_sink_chain (GstPad * pad,
68 GstObject * parent, GstBuffer * buffer);
69 static gboolean gst_image_freeze_sink_event (GstPad * pad, GstObject * parent,
71 static gboolean gst_image_freeze_sink_setcaps (GstImageFreeze * self,
73 static GstCaps *gst_image_freeze_sink_getcaps (GstImageFreeze * self,
75 static gboolean gst_image_freeze_sink_query (GstPad * pad, GstObject * parent,
77 static void gst_image_freeze_src_loop (GstPad * pad);
78 static gboolean gst_image_freeze_src_event (GstPad * pad, GstObject * parent,
80 static gboolean gst_image_freeze_src_query (GstPad * pad, GstObject * parent,
83 static GstStaticPadTemplate sink_pad_template = GST_STATIC_PAD_TEMPLATE ("sink",
86 GST_STATIC_CAPS ("video/x-raw(ANY)"));
88 static GstStaticPadTemplate src_pad_template =
89 GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
90 GST_STATIC_CAPS ("video/x-raw(ANY)"));
92 GST_DEBUG_CATEGORY_STATIC (gst_image_freeze_debug);
93 #define GST_CAT_DEFAULT gst_image_freeze_debug
95 #define gst_image_freeze_parent_class parent_class
96 G_DEFINE_TYPE (GstImageFreeze, gst_image_freeze, GST_TYPE_ELEMENT);
100 gst_image_freeze_class_init (GstImageFreezeClass * klass)
102 GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
103 GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
105 gobject_class->finalize = gst_image_freeze_finalize;
106 gobject_class->set_property = gst_image_freeze_set_property;
107 gobject_class->get_property = gst_image_freeze_get_property;
109 g_object_class_install_property (gobject_class, PROP_NUM_BUFFERS,
110 g_param_spec_int ("num-buffers", "num-buffers",
111 "Number of buffers to output before sending EOS (-1 = unlimited)",
112 -1, G_MAXINT, DEFAULT_NUM_BUFFERS, G_PARAM_READWRITE |
113 G_PARAM_STATIC_STRINGS));
115 gstelement_class->change_state =
116 GST_DEBUG_FUNCPTR (gst_image_freeze_change_state);
118 gst_element_class_set_static_metadata (gstelement_class,
119 "Still frame stream generator",
121 "Generates a still frame stream from an image",
122 "Sebastian Dröge <sebastian.droege@collabora.co.uk>");
124 gst_element_class_add_static_pad_template (gstelement_class,
126 gst_element_class_add_static_pad_template (gstelement_class,
131 gst_image_freeze_init (GstImageFreeze * self)
133 self->sinkpad = gst_pad_new_from_static_template (&sink_pad_template, "sink");
134 gst_pad_set_chain_function (self->sinkpad,
135 GST_DEBUG_FUNCPTR (gst_image_freeze_sink_chain));
136 gst_pad_set_event_function (self->sinkpad,
137 GST_DEBUG_FUNCPTR (gst_image_freeze_sink_event));
138 gst_pad_set_query_function (self->sinkpad,
139 GST_DEBUG_FUNCPTR (gst_image_freeze_sink_query));
140 GST_PAD_SET_PROXY_ALLOCATION (self->sinkpad);
141 gst_element_add_pad (GST_ELEMENT (self), self->sinkpad);
143 self->srcpad = gst_pad_new_from_static_template (&src_pad_template, "src");
144 gst_pad_set_event_function (self->srcpad,
145 GST_DEBUG_FUNCPTR (gst_image_freeze_src_event));
146 gst_pad_set_query_function (self->srcpad,
147 GST_DEBUG_FUNCPTR (gst_image_freeze_src_query));
148 gst_pad_use_fixed_caps (self->srcpad);
149 gst_element_add_pad (GST_ELEMENT (self), self->srcpad);
151 g_mutex_init (&self->lock);
153 self->num_buffers = DEFAULT_NUM_BUFFERS;
155 gst_image_freeze_reset (self);
159 gst_image_freeze_finalize (GObject * object)
161 GstImageFreeze *self = GST_IMAGE_FREEZE (object);
163 self->num_buffers = DEFAULT_NUM_BUFFERS;
165 gst_image_freeze_reset (self);
167 g_mutex_clear (&self->lock);
169 G_OBJECT_CLASS (parent_class)->finalize (object);
173 gst_image_freeze_reset (GstImageFreeze * self)
175 GST_DEBUG_OBJECT (self, "Resetting internal state");
177 g_mutex_lock (&self->lock);
178 gst_buffer_replace (&self->buffer, NULL);
179 self->num_buffers_left = self->num_buffers;
181 gst_segment_init (&self->segment, GST_FORMAT_TIME);
182 self->need_segment = TRUE;
184 self->fps_n = self->fps_d = 0;
187 g_mutex_unlock (&self->lock);
189 g_atomic_int_set (&self->seeking, 0);
193 gst_image_freeze_sink_setcaps (GstImageFreeze * self, GstCaps * caps)
195 gboolean ret = FALSE;
198 GstCaps *othercaps, *intersection;
203 caps = gst_caps_copy (caps);
205 GST_DEBUG_OBJECT (pad, "Setting caps: %" GST_PTR_FORMAT, caps);
207 s = gst_caps_get_structure (caps, 0);
209 /* 1. Remove framerate */
210 gst_structure_remove_field (s, "framerate");
211 gst_structure_set (s, "framerate", GST_TYPE_FRACTION_RANGE, 0, 1, G_MAXINT, 1,
214 /* 2. Intersect with template caps */
215 othercaps = (GstCaps *) gst_pad_get_pad_template_caps (pad);
216 intersection = gst_caps_intersect (caps, othercaps);
217 GST_DEBUG_OBJECT (pad, "Intersecting: %" GST_PTR_FORMAT, caps);
218 GST_DEBUG_OBJECT (pad, "with: %" GST_PTR_FORMAT, othercaps);
219 GST_DEBUG_OBJECT (pad, "gave: %" GST_PTR_FORMAT, intersection);
220 gst_caps_unref (caps);
221 gst_caps_unref (othercaps);
223 intersection = othercaps = NULL;
225 /* 3. Intersect with downstream peer caps */
226 othercaps = gst_pad_peer_query_caps (self->srcpad, caps);
227 GST_DEBUG_OBJECT (pad, "Peer query resulted: %" GST_PTR_FORMAT, othercaps);
228 gst_caps_unref (caps);
232 /* 4. For every candidate try to use it downstream with framerate as
233 * near as possible to 25/1 */
234 n = gst_caps_get_size (caps);
235 for (i = 0; i < n; i++) {
236 GstCaps *candidate = gst_caps_new_empty ();
237 GstStructure *s = gst_structure_copy (gst_caps_get_structure (caps, i));
239 gst_caps_append_structure (candidate, s);
240 if (gst_structure_has_field_typed (s, "framerate", GST_TYPE_FRACTION) ||
241 gst_structure_fixate_field_nearest_fraction (s, "framerate", 25, 1)) {
242 gst_structure_get_fraction (s, "framerate", &fps_n, &fps_d);
244 if (gst_pad_set_caps (self->srcpad, candidate)) {
245 g_mutex_lock (&self->lock);
248 g_mutex_unlock (&self->lock);
249 GST_DEBUG_OBJECT (pad, "Setting caps %" GST_PTR_FORMAT, candidate);
251 gst_caps_unref (candidate);
255 GST_WARNING_OBJECT (pad, "Invalid caps with framerate %d/%d", fps_n,
259 gst_caps_unref (candidate);
263 GST_ERROR_OBJECT (pad, "No usable caps found");
265 gst_caps_unref (caps);
270 /* remove framerate in writable @caps */
272 gst_image_freeze_remove_fps (GstImageFreeze * self, GstCaps * caps)
276 n = gst_caps_get_size (caps);
277 for (i = 0; i < n; i++) {
278 GstStructure *s = gst_caps_get_structure (caps, i);
280 gst_structure_remove_field (s, "framerate");
281 gst_structure_set (s, "framerate", GST_TYPE_FRACTION_RANGE, 0, 1, G_MAXINT,
287 gst_image_freeze_sink_getcaps (GstImageFreeze * self, GstCaps * filter)
289 GstCaps *ret, *tmp, *templ;
295 filter = gst_caps_copy (filter);
296 gst_image_freeze_remove_fps (self, filter);
298 templ = gst_pad_get_pad_template_caps (pad);
299 tmp = gst_pad_peer_query_caps (self->srcpad, filter);
301 GST_LOG_OBJECT (self, "peer caps %" GST_PTR_FORMAT, tmp);
302 ret = gst_caps_intersect (tmp, templ);
303 gst_caps_unref (tmp);
305 GST_LOG_OBJECT (self, "going to copy");
306 ret = gst_caps_copy (templ);
309 gst_caps_unref (templ);
311 gst_caps_unref (filter);
313 ret = gst_caps_make_writable (ret);
314 gst_image_freeze_remove_fps (self, ret);
316 GST_LOG_OBJECT (pad, "Returning caps: %" GST_PTR_FORMAT, ret);
322 gst_image_freeze_sink_query (GstPad * pad, GstObject * parent, GstQuery * query)
324 GstImageFreeze *self = GST_IMAGE_FREEZE (parent);
327 GST_LOG_OBJECT (pad, "Handling query of type '%s'",
328 gst_query_type_get_name (GST_QUERY_TYPE (query)));
330 switch (GST_QUERY_TYPE (query)) {
335 gst_query_parse_caps (query, &caps);
336 caps = gst_image_freeze_sink_getcaps (self, caps);
337 gst_query_set_caps_result (query, caps);
338 gst_caps_unref (caps);
343 ret = gst_pad_query_default (pad, parent, query);
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 g_mutex_lock (&self->lock);
371 if (self->fps_n == 0)
375 gst_util_uint64_scale (src_value, GST_SECOND * self->fps_d,
377 g_mutex_unlock (&self->lock);
385 case GST_FORMAT_TIME:{
386 switch (*dest_format) {
387 case GST_FORMAT_DEFAULT:
388 g_mutex_lock (&self->lock);
390 gst_util_uint64_scale (src_value, self->fps_n,
391 self->fps_d * GST_SECOND);
392 g_mutex_unlock (&self->lock);
408 gst_image_freeze_src_query (GstPad * pad, GstObject * parent, GstQuery * query)
410 GstImageFreeze *self = GST_IMAGE_FREEZE (parent);
411 gboolean ret = FALSE;
413 GST_LOG_OBJECT (pad, "Handling query of type '%s'",
414 gst_query_type_get_name (GST_QUERY_TYPE (query)));
416 switch (GST_QUERY_TYPE (query)) {
417 case GST_QUERY_CONVERT:{
418 GstFormat src_format, dest_format;
419 gint64 src_value, dest_value;
421 gst_query_parse_convert (query, &src_format, &src_value, &dest_format,
424 gst_image_freeze_convert (self, src_format, src_value, &dest_format,
427 gst_query_set_convert (query, src_format, src_value, dest_format,
431 case GST_QUERY_POSITION:{
435 gst_query_parse_position (query, &format, NULL);
437 case GST_FORMAT_DEFAULT:{
438 g_mutex_lock (&self->lock);
439 position = self->offset;
440 g_mutex_unlock (&self->lock);
444 case GST_FORMAT_TIME:{
445 g_mutex_lock (&self->lock);
446 position = self->segment.position;
447 g_mutex_unlock (&self->lock);
456 gst_query_set_position (query, format, position);
457 GST_DEBUG_OBJECT (pad,
458 "Returning position %" G_GINT64_FORMAT " in format %s", position,
459 gst_format_get_name (format));
461 GST_DEBUG_OBJECT (pad, "Position query failed");
465 case GST_QUERY_DURATION:{
469 gst_query_parse_duration (query, &format, NULL);
471 case GST_FORMAT_TIME:{
472 g_mutex_lock (&self->lock);
473 duration = self->segment.stop;
474 g_mutex_unlock (&self->lock);
478 case GST_FORMAT_DEFAULT:{
479 g_mutex_lock (&self->lock);
480 duration = self->segment.stop;
483 gst_util_uint64_scale (duration, self->fps_n,
484 GST_SECOND * self->fps_d);
485 g_mutex_unlock (&self->lock);
494 gst_query_set_duration (query, format, duration);
495 GST_DEBUG_OBJECT (pad,
496 "Returning duration %" G_GINT64_FORMAT " in format %s", duration,
497 gst_format_get_name (format));
499 GST_DEBUG_OBJECT (pad, "Duration query failed");
503 case GST_QUERY_SEEKING:{
507 gst_query_parse_seeking (query, &format, NULL, NULL, NULL);
508 seekable = (format == GST_FORMAT_TIME || format == GST_FORMAT_DEFAULT);
510 gst_query_set_seeking (query, format, seekable, (seekable ? 0 : -1), -1);
514 case GST_QUERY_LATENCY:
515 /* This will only return an accurate latency for the first buffer since
516 * all further buffers outputted by us are just copies of that one, and
517 * the latency is 0 in that case. However, latency changes are not
518 * straightforward, so let's do the conservative fix for now. */
519 ret = gst_pad_query_default (pad, parent, query);
531 gst_image_freeze_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
533 GstImageFreeze *self = GST_IMAGE_FREEZE (parent);
536 GST_LOG_OBJECT (pad, "Got %s event", GST_EVENT_TYPE_NAME (event));
538 switch (GST_EVENT_TYPE (event)) {
543 gst_event_parse_caps (event, &caps);
544 gst_image_freeze_sink_setcaps (self, caps);
545 gst_event_unref (event);
551 /* if we receive EOS before a buffer arrives, then let it pass */
552 GST_DEBUG_OBJECT (self, "EOS without input buffer, passing on");
553 ret = gst_pad_push_event (self->srcpad, event);
557 case GST_EVENT_SEGMENT:
558 GST_DEBUG_OBJECT (pad, "Dropping event");
559 gst_event_unref (event);
562 case GST_EVENT_FLUSH_START:
563 gst_image_freeze_reset (self);
566 ret = gst_pad_push_event (self->srcpad, event);
574 gst_image_freeze_src_event (GstPad * pad, GstObject * parent, GstEvent * event)
576 GstImageFreeze *self = GST_IMAGE_FREEZE (parent);
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;
601 seqnum = gst_event_get_seqnum (event);
602 gst_event_parse_seek (event, &rate, &format, &flags, &start_type, &start,
604 gst_event_unref (event);
606 flush = ! !(flags & GST_SEEK_FLAG_FLUSH);
608 if (format != GST_FORMAT_TIME && format != GST_FORMAT_DEFAULT) {
609 GST_ERROR_OBJECT (pad, "Seek in invalid format: %s",
610 gst_format_get_name (format));
615 if (format == GST_FORMAT_DEFAULT) {
616 format = GST_FORMAT_TIME;
617 if (!gst_image_freeze_convert (self, GST_FORMAT_DEFAULT, start, &format,
619 || !gst_image_freeze_convert (self, GST_FORMAT_DEFAULT, stop,
621 || start == -1 || stop == -1) {
622 GST_ERROR_OBJECT (pad,
623 "Failed to convert seek from DEFAULT format into TIME format");
632 g_atomic_int_set (&self->seeking, 1);
633 e = gst_event_new_flush_start ();
634 gst_event_set_seqnum (e, seqnum);
635 gst_pad_push_event (self->srcpad, e);
637 gst_pad_pause_task (self->srcpad);
640 GST_PAD_STREAM_LOCK (self->srcpad);
642 g_mutex_lock (&self->lock);
644 gst_segment_do_seek (&self->segment, rate, format, flags, start_type,
645 start, stop_type, stop, NULL);
646 self->need_segment = TRUE;
647 last_stop = self->segment.position;
649 start_task = self->buffer != NULL;
650 g_mutex_unlock (&self->lock);
655 e = gst_event_new_flush_stop (TRUE);
656 gst_event_set_seqnum (e, seqnum);
657 gst_pad_push_event (self->srcpad, e);
658 g_atomic_int_set (&self->seeking, 0);
661 if (flags & GST_SEEK_FLAG_SEGMENT) {
664 m = gst_message_new_segment_start (GST_OBJECT (self),
666 gst_element_post_message (GST_ELEMENT (self), m);
669 self->seqnum = seqnum;
670 GST_PAD_STREAM_UNLOCK (self->srcpad);
672 GST_DEBUG_OBJECT (pad, "Seek successful");
675 g_mutex_lock (&self->lock);
677 if (self->buffer != NULL)
678 gst_pad_start_task (self->srcpad,
679 (GstTaskFunction) gst_image_freeze_src_loop, self->srcpad, NULL);
681 g_mutex_unlock (&self->lock);
687 case GST_EVENT_FLUSH_START:
688 gst_image_freeze_reset (self);
691 ret = gst_pad_push_event (self->sinkpad, event);
699 gst_image_freeze_set_property (GObject * object, guint prop_id,
700 const GValue * value, GParamSpec * pspec)
702 GstImageFreeze *self;
704 self = GST_IMAGE_FREEZE (object);
707 case PROP_NUM_BUFFERS:
708 self->num_buffers = g_value_get_int (value);
711 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
717 gst_image_freeze_get_property (GObject * object, guint prop_id, GValue * value,
720 GstImageFreeze *self;
722 self = GST_IMAGE_FREEZE (object);
725 case PROP_NUM_BUFFERS:
726 g_value_set_int (value, self->num_buffers);
729 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
735 gst_image_freeze_sink_chain (GstPad * pad, GstObject * parent,
738 GstImageFreeze *self = GST_IMAGE_FREEZE (parent);
740 g_mutex_lock (&self->lock);
742 GST_DEBUG_OBJECT (pad, "Already have a buffer, dropping");
743 gst_buffer_unref (buffer);
744 g_mutex_unlock (&self->lock);
748 self->buffer = buffer;
750 gst_pad_start_task (self->srcpad, (GstTaskFunction) gst_image_freeze_src_loop,
752 g_mutex_unlock (&self->lock);
757 gst_image_freeze_src_loop (GstPad * pad)
759 GstImageFreeze *self = GST_IMAGE_FREEZE (GST_PAD_PARENT (pad));
762 GstClockTime timestamp, timestamp_end;
763 guint64 cstart, cstop;
764 gboolean in_seg, eos;
765 GstFlowReturn flow_ret = GST_FLOW_OK;
767 g_mutex_lock (&self->lock);
768 if (!gst_pad_has_current_caps (self->srcpad)) {
769 GST_ERROR_OBJECT (pad, "Not negotiated yet");
770 flow_ret = GST_FLOW_NOT_NEGOTIATED;
771 g_mutex_unlock (&self->lock);
776 GST_ERROR_OBJECT (pad, "Have no buffer yet");
777 flow_ret = GST_FLOW_ERROR;
778 g_mutex_unlock (&self->lock);
782 /* normally we don't count buffers */
783 if (G_UNLIKELY (self->num_buffers_left >= 0)) {
784 GST_DEBUG_OBJECT (pad, "Buffers left %d", self->num_buffers_left);
785 if (self->num_buffers_left == 0) {
786 flow_ret = GST_FLOW_EOS;
787 g_mutex_unlock (&self->lock);
790 self->num_buffers_left--;
793 buffer = gst_buffer_copy (self->buffer);
795 g_mutex_unlock (&self->lock);
797 if (self->need_segment) {
800 GST_DEBUG_OBJECT (pad, "Pushing SEGMENT event: %" GST_SEGMENT_FORMAT,
802 e = gst_event_new_segment (&self->segment);
805 gst_event_set_seqnum (e, self->seqnum);
807 g_mutex_lock (&self->lock);
808 if (self->segment.rate >= 0) {
810 gst_util_uint64_scale (self->segment.start, self->fps_n,
811 self->fps_d * GST_SECOND);
814 gst_util_uint64_scale (self->segment.stop, self->fps_n,
815 self->fps_d * GST_SECOND);
817 g_mutex_unlock (&self->lock);
819 self->need_segment = FALSE;
821 gst_pad_push_event (self->srcpad, e);
824 g_mutex_lock (&self->lock);
825 offset = self->offset;
827 if (self->fps_n != 0) {
829 gst_util_uint64_scale (offset, self->fps_d * GST_SECOND, self->fps_n);
831 gst_util_uint64_scale (offset + 1, self->fps_d * GST_SECOND,
834 timestamp = self->segment.start;
835 timestamp_end = GST_CLOCK_TIME_NONE;
838 eos = (self->fps_n == 0 && offset > 0) ||
839 (self->segment.rate >= 0 && self->segment.stop != -1
840 && timestamp > self->segment.stop) || (self->segment.rate < 0
841 && offset == 0) || (self->segment.rate < 0
842 && self->segment.start != -1 && timestamp_end < self->segment.start);
844 if (self->fps_n == 0 && offset > 0)
848 gst_segment_clip (&self->segment, GST_FORMAT_TIME, timestamp,
849 timestamp_end, &cstart, &cstop);
852 self->segment.position = cstart;
853 if (self->segment.rate >= 0)
854 self->segment.position = cstop;
857 if (self->segment.rate >= 0)
861 g_mutex_unlock (&self->lock);
863 GST_DEBUG_OBJECT (pad, "Handling buffer with timestamp %" GST_TIME_FORMAT,
864 GST_TIME_ARGS (timestamp));
867 GST_BUFFER_DTS (buffer) = GST_CLOCK_TIME_NONE;
868 GST_BUFFER_PTS (buffer) = cstart;
869 GST_BUFFER_DURATION (buffer) = cstop - cstart;
870 GST_BUFFER_OFFSET (buffer) = offset;
871 GST_BUFFER_OFFSET_END (buffer) = offset + 1;
872 flow_ret = gst_pad_push (self->srcpad, buffer);
873 GST_DEBUG_OBJECT (pad, "Pushing buffer resulted in %s",
874 gst_flow_get_name (flow_ret));
875 if (flow_ret != GST_FLOW_OK)
878 gst_buffer_unref (buffer);
882 flow_ret = GST_FLOW_EOS;
890 const gchar *reason = gst_flow_get_name (flow_ret);
892 GST_LOG_OBJECT (self, "pausing task, reason %s", reason);
893 gst_pad_pause_task (pad);
895 if (flow_ret == GST_FLOW_EOS) {
896 if ((self->segment.flags & GST_SEEK_FLAG_SEGMENT)) {
900 GST_DEBUG_OBJECT (pad, "Sending segment done at end of segment");
901 if (self->segment.rate >= 0) {
902 m = gst_message_new_segment_done (GST_OBJECT_CAST (self),
903 GST_FORMAT_TIME, self->segment.stop);
904 e = gst_event_new_segment_done (GST_FORMAT_TIME, self->segment.stop);
906 m = gst_message_new_segment_done (GST_OBJECT_CAST (self),
907 GST_FORMAT_TIME, self->segment.start);
908 e = gst_event_new_segment_done (GST_FORMAT_TIME, self->segment.start);
910 gst_element_post_message (GST_ELEMENT_CAST (self), m);
911 gst_pad_push_event (self->srcpad, e);
913 GstEvent *e = gst_event_new_eos ();
915 GST_DEBUG_OBJECT (pad, "Sending EOS at end of segment");
918 gst_event_set_seqnum (e, self->seqnum);
919 gst_pad_push_event (self->srcpad, e);
921 } else if (flow_ret == GST_FLOW_NOT_LINKED || flow_ret < GST_FLOW_EOS) {
922 GstEvent *e = gst_event_new_eos ();
924 GST_ELEMENT_FLOW_ERROR (self, flow_ret);
927 gst_event_set_seqnum (e, self->seqnum);
929 gst_pad_push_event (self->srcpad, e);
935 static GstStateChangeReturn
936 gst_image_freeze_change_state (GstElement * element, GstStateChange transition)
938 GstImageFreeze *self = GST_IMAGE_FREEZE (element);
939 GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
941 switch (transition) {
942 case GST_STATE_CHANGE_READY_TO_PAUSED:
943 gst_image_freeze_reset (self);
945 case GST_STATE_CHANGE_PAUSED_TO_READY:
946 gst_pad_stop_task (self->srcpad);
947 gst_image_freeze_reset (self);
953 if (GST_ELEMENT_CLASS (parent_class)->change_state)
954 ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
956 switch (transition) {
965 plugin_init (GstPlugin * plugin)
967 GST_DEBUG_CATEGORY_INIT (gst_image_freeze_debug, "imagefreeze", 0,
968 "imagefreeze element");
970 if (!gst_element_register (plugin, "imagefreeze", GST_RANK_NONE,
971 GST_TYPE_IMAGE_FREEZE))
977 GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
980 "Still frame stream generator",
981 plugin_init, VERSION, "LGPL", GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)