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 /* FIXME 0.11: suppress warnings for deprecated API such as GStaticRecMutex
45 * with newer GLib versions (>= 2.31.0) */
46 #define GLIB_DISABLE_DEPRECATION_WARNINGS
48 #include <gst/glib-compat-private.h>
50 #include "gstimagefreeze.h"
52 static void gst_image_freeze_finalize (GObject * object);
54 static void gst_image_freeze_reset (GstImageFreeze * self);
56 static GstStateChangeReturn gst_image_freeze_change_state (GstElement * element,
57 GstStateChange transition);
59 static GstFlowReturn gst_image_freeze_sink_chain (GstPad * pad,
61 static gboolean gst_image_freeze_sink_event (GstPad * pad, GstEvent * event);
62 static gboolean gst_image_freeze_sink_setcaps (GstPad * pad, GstCaps * caps);
63 static GstCaps *gst_image_freeze_sink_getcaps (GstPad * pad);
64 static gboolean gst_image_freeze_sink_query (GstPad * pad, GstQuery * query);
65 static GstFlowReturn gst_image_freeze_sink_bufferalloc (GstPad * pad,
66 guint64 offset, guint size, GstCaps * caps, GstBuffer ** buf);
67 static void gst_image_freeze_src_loop (GstPad * pad);
68 static gboolean gst_image_freeze_src_event (GstPad * pad, GstEvent * event);
69 static gboolean gst_image_freeze_src_query (GstPad * pad, GstQuery * query);
70 static const GstQueryType *gst_image_freeze_src_query_type (GstPad * pad);
72 static GstStaticPadTemplate sink_pad_template = GST_STATIC_PAD_TEMPLATE ("sink",
75 GST_STATIC_CAPS ("video/x-raw-yuv; video/x-raw-rgb; video/x-raw-gray"));
77 static GstStaticPadTemplate src_pad_template =
78 GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
79 GST_STATIC_CAPS ("video/x-raw-yuv; video/x-raw-rgb; video/x-raw-gray"));
81 GST_DEBUG_CATEGORY_STATIC (gst_image_freeze_debug);
82 #define GST_CAT_DEFAULT gst_image_freeze_debug
84 GST_BOILERPLATE (GstImageFreeze, gst_image_freeze, GstElement,
88 gst_image_freeze_base_init (gpointer g_class)
90 GstElementClass *gstelement_class = GST_ELEMENT_CLASS (g_class);
92 gst_element_class_set_details_simple (gstelement_class,
93 "Still frame stream generator",
95 "Generates a still frame stream from an image",
96 "Sebastian Dröge <sebastian.droege@collabora.co.uk>");
98 gst_element_class_add_static_pad_template (gstelement_class,
100 gst_element_class_add_static_pad_template (gstelement_class,
105 gst_image_freeze_class_init (GstImageFreezeClass * klass)
107 GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
108 GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
110 gobject_class->finalize = gst_image_freeze_finalize;
112 gstelement_class->change_state =
113 GST_DEBUG_FUNCPTR (gst_image_freeze_change_state);
117 gst_image_freeze_init (GstImageFreeze * self, GstImageFreezeClass * g_class)
119 self->sinkpad = gst_pad_new_from_static_template (&sink_pad_template, "sink");
120 gst_pad_set_chain_function (self->sinkpad,
121 GST_DEBUG_FUNCPTR (gst_image_freeze_sink_chain));
122 gst_pad_set_event_function (self->sinkpad,
123 GST_DEBUG_FUNCPTR (gst_image_freeze_sink_event));
124 gst_pad_set_query_function (self->sinkpad,
125 GST_DEBUG_FUNCPTR (gst_image_freeze_sink_query));
126 gst_pad_set_setcaps_function (self->sinkpad,
127 GST_DEBUG_FUNCPTR (gst_image_freeze_sink_setcaps));
128 gst_pad_set_getcaps_function (self->sinkpad,
129 GST_DEBUG_FUNCPTR (gst_image_freeze_sink_getcaps));
130 gst_pad_set_bufferalloc_function (self->sinkpad,
131 GST_DEBUG_FUNCPTR (gst_image_freeze_sink_bufferalloc));
132 gst_element_add_pad (GST_ELEMENT (self), self->sinkpad);
134 self->srcpad = gst_pad_new_from_static_template (&src_pad_template, "src");
135 gst_pad_set_event_function (self->srcpad,
136 GST_DEBUG_FUNCPTR (gst_image_freeze_src_event));
137 gst_pad_set_query_function (self->srcpad,
138 GST_DEBUG_FUNCPTR (gst_image_freeze_src_query));
139 gst_pad_set_query_type_function (self->srcpad,
140 GST_DEBUG_FUNCPTR (gst_image_freeze_src_query_type));
141 gst_pad_use_fixed_caps (self->srcpad);
142 gst_element_add_pad (GST_ELEMENT (self), self->srcpad);
144 self->lock = g_mutex_new ();
146 gst_image_freeze_reset (self);
150 gst_image_freeze_finalize (GObject * object)
152 GstImageFreeze *self = GST_IMAGE_FREEZE (object);
154 gst_image_freeze_reset (self);
157 g_mutex_free (self->lock);
160 G_OBJECT_CLASS (parent_class)->finalize (object);
164 gst_image_freeze_reset (GstImageFreeze * self)
166 GST_DEBUG_OBJECT (self, "Resetting internal state");
168 g_mutex_lock (self->lock);
169 gst_buffer_replace (&self->buffer, NULL);
171 gst_segment_init (&self->segment, GST_FORMAT_TIME);
172 self->need_segment = TRUE;
173 gst_event_replace (&self->close_segment, NULL);
175 self->fps_n = self->fps_d = 0;
177 g_mutex_unlock (self->lock);
179 g_atomic_int_set (&self->seeking, 0);
183 gst_image_freeze_sink_setcaps (GstPad * pad, GstCaps * caps)
185 GstImageFreeze *self = GST_IMAGE_FREEZE (gst_pad_get_parent (pad));
186 gboolean ret = FALSE;
189 GstCaps *othercaps, *intersection;
192 caps = gst_caps_make_writable (gst_caps_ref (caps));
194 GST_DEBUG_OBJECT (pad, "Setting caps: %" GST_PTR_FORMAT, caps);
196 s = gst_caps_get_structure (caps, 0);
198 /* 1. Remove framerate */
199 gst_structure_remove_field (s, "framerate");
200 gst_structure_set (s, "framerate", GST_TYPE_FRACTION_RANGE, 0, 1, G_MAXINT, 1,
203 /* 2. Intersect with template caps */
204 othercaps = (GstCaps *) gst_pad_get_pad_template_caps (pad);
205 intersection = gst_caps_intersect (caps, othercaps);
206 GST_DEBUG_OBJECT (pad, "Intersecting: %" GST_PTR_FORMAT, caps);
207 GST_DEBUG_OBJECT (pad, "with: %" GST_PTR_FORMAT, othercaps);
208 GST_DEBUG_OBJECT (pad, "gave: %" GST_PTR_FORMAT, intersection);
209 gst_caps_unref (caps);
211 intersection = othercaps = NULL;
213 /* 3. Intersect with downstream peer caps */
214 othercaps = gst_pad_peer_get_caps (self->srcpad);
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 (othercaps);
221 gst_caps_unref (caps);
223 intersection = othercaps = NULL;
226 /* 4. For every candidate check if it's accepted downstream
227 * and fixate framerate to nearest 25/1 */
228 n = gst_caps_get_size (caps);
229 for (i = 0; i < n; i++) {
230 GstCaps *candidate = gst_caps_new_empty ();
231 GstStructure *s = gst_structure_copy (gst_caps_get_structure (caps, i));
233 gst_caps_append_structure (candidate, s);
234 if (gst_pad_peer_accept_caps (self->srcpad, candidate)) {
235 if (gst_structure_has_field_typed (s, "framerate", GST_TYPE_FRACTION) ||
236 gst_structure_fixate_field_nearest_fraction (s, "framerate", 25, 1)) {
237 gst_structure_get_fraction (s, "framerate", &fps_n, &fps_d);
239 g_mutex_lock (self->lock);
242 g_mutex_unlock (self->lock);
243 GST_DEBUG_OBJECT (pad, "Setting caps %" GST_PTR_FORMAT, candidate);
244 gst_pad_set_caps (self->srcpad, candidate);
245 gst_caps_unref (candidate);
249 GST_WARNING_OBJECT (pad, "Invalid caps with framerate %d/%d", fps_n,
254 gst_caps_unref (candidate);
259 GST_ERROR_OBJECT (pad, "No usable caps found");
261 gst_caps_unref (caps);
262 gst_object_unref (self);
268 gst_image_freeze_sink_getcaps (GstPad * pad)
270 GstImageFreeze *self = GST_IMAGE_FREEZE (gst_pad_get_parent (pad));
274 if (GST_PAD_CAPS (pad)) {
275 ret = gst_caps_copy (GST_PAD_CAPS (pad));
279 tmp = gst_pad_peer_get_caps (self->srcpad);
281 ret = gst_caps_intersect (tmp, gst_pad_get_pad_template_caps (pad));
282 gst_caps_unref (tmp);
284 ret = gst_caps_copy (gst_pad_get_pad_template_caps (pad));
287 n = gst_caps_get_size (ret);
288 for (i = 0; i < n; i++) {
289 GstStructure *s = gst_caps_get_structure (ret, i);
291 gst_structure_remove_field (s, "framerate");
292 gst_structure_set (s, "framerate", GST_TYPE_FRACTION_RANGE, 0, 1, G_MAXINT,
297 gst_object_unref (self);
299 GST_LOG_OBJECT (pad, "Returning caps: %" GST_PTR_FORMAT, ret);
305 gst_image_freeze_sink_query (GstPad * pad, GstQuery * query)
307 GstImageFreeze *self = GST_IMAGE_FREEZE (gst_pad_get_parent (pad));
309 GstPad *peer = gst_pad_get_peer (self->srcpad);
311 GST_LOG_OBJECT (pad, "Handling query of type '%s'",
312 gst_query_type_get_name (GST_QUERY_TYPE (query)));
315 GST_INFO_OBJECT (pad, "No peer yet, dropping query");
318 ret = gst_pad_query (peer, query);
319 gst_object_unref (peer);
322 gst_object_unref (self);
327 gst_image_freeze_sink_bufferalloc (GstPad * pad, guint64 offset, guint size,
328 GstCaps * caps, GstBuffer ** buf)
330 GstImageFreeze *self = GST_IMAGE_FREEZE (gst_pad_get_parent (pad));
334 GST_LOG_OBJECT (pad, "Allocating buffer with offset 0x%" G_GINT64_MODIFIER
335 "x and size %u with caps: %" GST_PTR_FORMAT, offset, size, caps);
339 g_mutex_lock (self->lock);
340 do_alloc = self->buffer == NULL;
341 g_mutex_unlock (self->lock);
344 gboolean seeking = FALSE;
347 GST_PAD_STREAM_LOCK (self->srcpad);
348 ret = gst_pad_alloc_buffer (self->srcpad, offset, size, caps, buf);
350 seeking = ret == GST_FLOW_WRONG_STATE
351 && g_atomic_int_get (&self->seeking);
352 GST_PAD_STREAM_UNLOCK (self->srcpad);
355 if (G_UNLIKELY (ret != GST_FLOW_OK))
356 GST_ERROR_OBJECT (pad, "Allocating buffer failed: %s",
357 gst_flow_get_name (ret));
359 /* Let upstream go EOS if we already have a buffer */
360 ret = GST_FLOW_UNEXPECTED;
363 gst_object_unref (self);
369 gst_image_freeze_convert (GstImageFreeze * self,
370 GstFormat src_format, gint64 src_value,
371 GstFormat * dest_format, gint64 * dest_value)
373 gboolean ret = FALSE;
375 if (src_format == *dest_format) {
376 *dest_value = src_value;
380 if (src_value == -1) {
385 switch (src_format) {
386 case GST_FORMAT_DEFAULT:{
387 switch (*dest_format) {
388 case GST_FORMAT_TIME:
389 g_mutex_lock (self->lock);
390 if (self->fps_n == 0)
394 gst_util_uint64_scale (src_value, GST_SECOND * self->fps_d,
396 g_mutex_unlock (self->lock);
404 case GST_FORMAT_TIME:{
405 switch (*dest_format) {
406 case GST_FORMAT_DEFAULT:
407 g_mutex_lock (self->lock);
409 gst_util_uint64_scale (src_value, self->fps_n,
410 self->fps_d * GST_SECOND);
411 g_mutex_unlock (self->lock);
426 static const GstQueryType *
427 gst_image_freeze_src_query_type (GstPad * pad)
429 static const GstQueryType types[] = {
441 gst_image_freeze_src_query (GstPad * pad, GstQuery * query)
443 GstImageFreeze *self = GST_IMAGE_FREEZE (gst_pad_get_parent (pad));
444 gboolean ret = FALSE;
446 GST_LOG_OBJECT (pad, "Handling query of type '%s'",
447 gst_query_type_get_name (GST_QUERY_TYPE (query)));
449 switch (GST_QUERY_TYPE (query)) {
450 case GST_QUERY_CONVERT:{
451 GstFormat src_format, dest_format;
452 gint64 src_value, dest_value;
454 gst_query_parse_convert (query, &src_format, &src_value, &dest_format,
457 gst_image_freeze_convert (self, src_format, src_value, &dest_format,
460 gst_query_set_convert (query, src_format, src_value, dest_format,
464 case GST_QUERY_POSITION:{
468 gst_query_parse_position (query, &format, NULL);
470 case GST_FORMAT_DEFAULT:{
471 g_mutex_lock (self->lock);
472 position = self->offset;
473 g_mutex_unlock (self->lock);
477 case GST_FORMAT_TIME:{
478 g_mutex_lock (self->lock);
479 position = self->segment.last_stop;
480 g_mutex_unlock (self->lock);
489 gst_query_set_position (query, format, position);
490 GST_DEBUG_OBJECT (pad,
491 "Returning position %" G_GINT64_FORMAT " in format %s", position,
492 gst_format_get_name (format));
494 GST_DEBUG_OBJECT (pad, "Position query failed");
498 case GST_QUERY_DURATION:{
502 gst_query_parse_duration (query, &format, NULL);
504 case GST_FORMAT_TIME:{
505 g_mutex_lock (self->lock);
506 duration = self->segment.stop;
507 g_mutex_unlock (self->lock);
511 case GST_FORMAT_DEFAULT:{
512 g_mutex_lock (self->lock);
513 duration = self->segment.stop;
516 gst_util_uint64_scale (duration, self->fps_n,
517 GST_SECOND * self->fps_d);
518 g_mutex_unlock (self->lock);
527 gst_query_set_duration (query, format, duration);
528 GST_DEBUG_OBJECT (pad,
529 "Returning duration %" G_GINT64_FORMAT " in format %s", duration,
530 gst_format_get_name (format));
532 GST_DEBUG_OBJECT (pad, "Duration query failed");
536 case GST_QUERY_SEEKING:{
540 gst_query_parse_seeking (query, &format, NULL, NULL, NULL);
541 seekable = (format == GST_FORMAT_TIME || format == GST_FORMAT_DEFAULT);
543 gst_query_set_seeking (query, format, seekable, (seekable ? 0 : -1), -1);
552 gst_object_unref (self);
558 gst_image_freeze_sink_event (GstPad * pad, GstEvent * event)
560 GstImageFreeze *self = GST_IMAGE_FREEZE (gst_pad_get_parent (pad));
563 GST_LOG_OBJECT (pad, "Got %s event", GST_EVENT_TYPE_NAME (event));
565 switch (GST_EVENT_TYPE (event)) {
568 /* if we receive EOS before a buffer arrives, then let it pass */
569 GST_DEBUG_OBJECT (self, "EOS without input buffer, passing on");
570 ret = gst_pad_push_event (self->srcpad, event);
574 case GST_EVENT_NEWSEGMENT:
575 GST_DEBUG_OBJECT (pad, "Dropping event");
576 gst_event_unref (event);
579 case GST_EVENT_FLUSH_START:
580 gst_image_freeze_reset (self);
583 ret = gst_pad_push_event (self->srcpad, event);
587 gst_object_unref (self);
592 gst_image_freeze_src_event (GstPad * pad, GstEvent * event)
594 GstImageFreeze *self = GST_IMAGE_FREEZE (gst_pad_get_parent (pad));
597 GST_LOG_OBJECT (pad, "Got %s event", GST_EVENT_TYPE_NAME (event));
599 switch (GST_EVENT_TYPE (event)) {
600 case GST_EVENT_NAVIGATION:
602 case GST_EVENT_LATENCY:
604 GST_DEBUG_OBJECT (pad, "Dropping event");
605 gst_event_unref (event);
608 case GST_EVENT_SEEK:{
612 GstSeekType start_type, stop_type;
618 gst_event_parse_seek (event, &rate, &format, &flags, &start_type, &start,
620 gst_event_unref (event);
622 flush = ! !(flags & GST_SEEK_FLAG_FLUSH);
624 if (format != GST_FORMAT_TIME && format != GST_FORMAT_DEFAULT) {
625 GST_ERROR_OBJECT (pad, "Seek in invalid format: %s",
626 gst_format_get_name (format));
631 if (format == GST_FORMAT_DEFAULT) {
632 format = GST_FORMAT_TIME;
633 if (!gst_image_freeze_convert (self, GST_FORMAT_DEFAULT, start, &format,
635 || !gst_image_freeze_convert (self, GST_FORMAT_DEFAULT, stop,
637 || start == -1 || stop == -1) {
638 GST_ERROR_OBJECT (pad,
639 "Failed to convert seek from DEFAULT format into TIME format");
648 g_atomic_int_set (&self->seeking, 1);
649 e = gst_event_new_flush_start ();
650 gst_pad_push_event (self->srcpad, e);
652 gst_pad_pause_task (self->srcpad);
655 GST_PAD_STREAM_LOCK (self->srcpad);
657 g_mutex_lock (self->lock);
658 gst_event_replace (&self->close_segment, NULL);
660 if (!self->need_segment && self->segment.rate >= 0) {
661 self->close_segment =
662 gst_event_new_new_segment_full (TRUE, self->segment.rate,
663 self->segment.applied_rate, self->segment.format,
664 self->segment.start, self->segment.last_stop, self->segment.time);
665 } else if (!self->need_segment) {
668 if ((stop = self->segment.stop) == -1)
669 stop = self->segment.duration;
671 self->close_segment =
672 gst_event_new_new_segment_full (TRUE, self->segment.rate,
673 self->segment.applied_rate, self->segment.format,
674 self->segment.last_stop, stop, self->segment.last_stop);
678 gst_segment_set_seek (&self->segment, rate, format, flags, start_type,
679 start, stop_type, stop, NULL);
680 self->need_segment = TRUE;
681 last_stop = self->segment.last_stop;
683 start_task = self->buffer != NULL;
684 g_mutex_unlock (self->lock);
689 e = gst_event_new_flush_stop ();
690 gst_pad_push_event (self->srcpad, e);
691 g_atomic_int_set (&self->seeking, 0);
694 if (flags & GST_SEEK_FLAG_SEGMENT) {
697 m = gst_message_new_segment_start (GST_OBJECT (self),
699 gst_element_post_message (GST_ELEMENT (self), m);
702 GST_PAD_STREAM_UNLOCK (self->srcpad);
704 GST_DEBUG_OBJECT (pad, "Seek successful");
707 g_mutex_lock (self->lock);
709 if (self->buffer != NULL)
710 gst_pad_start_task (self->srcpad,
711 (GstTaskFunction) gst_image_freeze_src_loop, self->srcpad);
713 g_mutex_unlock (self->lock);
719 case GST_EVENT_FLUSH_START:
720 gst_image_freeze_reset (self);
723 ret = gst_pad_push_event (self->sinkpad, event);
727 gst_object_unref (self);
732 gst_image_freeze_sink_chain (GstPad * pad, GstBuffer * buffer)
734 GstImageFreeze *self = GST_IMAGE_FREEZE (GST_PAD_PARENT (pad));
736 g_mutex_lock (self->lock);
738 GST_DEBUG_OBJECT (pad, "Already have a buffer, dropping");
739 gst_buffer_unref (buffer);
740 g_mutex_unlock (self->lock);
741 return GST_FLOW_UNEXPECTED;
744 self->buffer = buffer;
746 gst_pad_start_task (self->srcpad, (GstTaskFunction) gst_image_freeze_src_loop,
748 g_mutex_unlock (self->lock);
753 gst_image_freeze_src_loop (GstPad * pad)
755 GstImageFreeze *self = GST_IMAGE_FREEZE (GST_PAD_PARENT (pad));
758 GstClockTime timestamp, timestamp_end;
759 gint64 cstart, cstop;
760 gboolean in_seg, eos;
762 g_mutex_lock (self->lock);
764 GST_ERROR_OBJECT (pad, "Have no buffer yet");
765 g_mutex_unlock (self->lock);
766 gst_pad_pause_task (self->srcpad);
769 buffer = gst_buffer_ref (self->buffer);
770 buffer = gst_buffer_make_metadata_writable (buffer);
771 g_mutex_unlock (self->lock);
773 if (self->close_segment) {
774 GST_DEBUG_OBJECT (pad, "Closing previous segment");
775 gst_pad_push_event (self->srcpad, self->close_segment);
776 self->close_segment = NULL;
779 if (self->need_segment) {
782 GST_DEBUG_OBJECT (pad, "Pushing NEWSEGMENT event: %" GST_SEGMENT_FORMAT,
784 e = gst_event_new_new_segment_full (FALSE, self->segment.rate,
785 self->segment.applied_rate, self->segment.format, self->segment.start,
786 self->segment.stop, self->segment.start);
788 g_mutex_lock (self->lock);
789 if (self->segment.rate >= 0) {
791 gst_util_uint64_scale (self->segment.start, self->fps_n,
792 self->fps_d * GST_SECOND);
795 gst_util_uint64_scale (self->segment.stop, self->fps_n,
796 self->fps_d * GST_SECOND);
798 g_mutex_unlock (self->lock);
800 self->need_segment = FALSE;
802 gst_pad_push_event (self->srcpad, e);
805 g_mutex_lock (self->lock);
806 offset = self->offset;
808 if (self->fps_n != 0) {
810 gst_util_uint64_scale (offset, self->fps_d * GST_SECOND, self->fps_n);
812 gst_util_uint64_scale (offset + 1, self->fps_d * GST_SECOND,
815 timestamp = self->segment.start;
816 timestamp_end = GST_CLOCK_TIME_NONE;
819 eos = (self->fps_n == 0 && offset > 0) ||
820 (self->segment.rate >= 0 && self->segment.stop != -1
821 && timestamp > self->segment.stop) || (self->segment.rate < 0
822 && offset == 0) || (self->segment.rate < 0
823 && self->segment.start != -1 && timestamp_end < self->segment.start);
825 if (self->fps_n == 0 && offset > 0)
829 gst_segment_clip (&self->segment, GST_FORMAT_TIME, timestamp,
830 timestamp_end, &cstart, &cstop);
833 gst_segment_set_last_stop (&self->segment, GST_FORMAT_TIME, cstart);
835 if (self->segment.rate >= 0)
839 g_mutex_unlock (self->lock);
841 GST_DEBUG_OBJECT (pad, "Handling buffer with timestamp %" GST_TIME_FORMAT,
842 GST_TIME_ARGS (timestamp));
847 GST_BUFFER_TIMESTAMP (buffer) = cstart;
848 GST_BUFFER_DURATION (buffer) = cstop - cstart;
849 GST_BUFFER_OFFSET (buffer) = offset;
850 GST_BUFFER_OFFSET_END (buffer) = offset + 1;
851 gst_buffer_set_caps (buffer, GST_PAD_CAPS (self->srcpad));
852 ret = gst_pad_push (self->srcpad, buffer);
853 GST_DEBUG_OBJECT (pad, "Pushing buffer resulted in %s",
854 gst_flow_get_name (ret));
855 if (ret != GST_FLOW_OK)
856 gst_pad_pause_task (self->srcpad);
858 gst_buffer_unref (buffer);
862 if ((self->segment.flags & GST_SEEK_FLAG_SEGMENT)) {
865 GST_DEBUG_OBJECT (pad, "Sending segment done at end of segment");
866 if (self->segment.rate >= 0)
867 m = gst_message_new_segment_done (GST_OBJECT_CAST (self),
868 GST_FORMAT_TIME, self->segment.stop);
870 m = gst_message_new_segment_done (GST_OBJECT_CAST (self),
871 GST_FORMAT_TIME, self->segment.start);
872 gst_element_post_message (GST_ELEMENT_CAST (self), m);
874 GST_DEBUG_OBJECT (pad, "Sending EOS at end of segment");
875 gst_pad_push_event (self->srcpad, gst_event_new_eos ());
877 gst_pad_pause_task (self->srcpad);
881 static GstStateChangeReturn
882 gst_image_freeze_change_state (GstElement * element, GstStateChange transition)
884 GstImageFreeze *self = GST_IMAGE_FREEZE (element);
885 GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
887 switch (transition) {
888 case GST_STATE_CHANGE_READY_TO_PAUSED:
889 gst_image_freeze_reset (self);
891 case GST_STATE_CHANGE_PAUSED_TO_READY:
892 gst_pad_stop_task (self->srcpad);
893 gst_image_freeze_reset (self);
899 if (GST_ELEMENT_CLASS (parent_class)->change_state)
900 ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
902 switch (transition) {
911 plugin_init (GstPlugin * plugin)
913 GST_DEBUG_CATEGORY_INIT (gst_image_freeze_debug, "imagefreeze", 0,
914 "imagefreeze element");
916 if (!gst_element_register (plugin, "imagefreeze", GST_RANK_NONE,
917 GST_TYPE_IMAGE_FREEZE))
923 GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
926 "Still frame stream generator",
927 plugin_init, VERSION, "LGPL", GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)