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 <gst/glib-compat-private.h>
46 #include "gstimagefreeze.h"
48 static void gst_image_freeze_finalize (GObject * object);
50 static void gst_image_freeze_reset (GstImageFreeze * self);
52 static GstStateChangeReturn gst_image_freeze_change_state (GstElement * element,
53 GstStateChange transition);
55 static GstFlowReturn gst_image_freeze_sink_chain (GstPad * pad,
57 static gboolean gst_image_freeze_sink_event (GstPad * pad, GstEvent * event);
58 static gboolean gst_image_freeze_sink_setcaps (GstPad * pad, GstCaps * caps);
59 static GstCaps *gst_image_freeze_sink_getcaps (GstPad * pad);
60 static gboolean gst_image_freeze_sink_query (GstPad * pad, GstQuery * query);
61 static GstFlowReturn gst_image_freeze_sink_bufferalloc (GstPad * pad,
62 guint64 offset, guint size, GstCaps * caps, GstBuffer ** buf);
63 static void gst_image_freeze_src_loop (GstPad * pad);
64 static gboolean gst_image_freeze_src_event (GstPad * pad, GstEvent * event);
65 static gboolean gst_image_freeze_src_query (GstPad * pad, GstQuery * query);
66 static const GstQueryType *gst_image_freeze_src_query_type (GstPad * pad);
68 static GstStaticPadTemplate sink_pad_template = GST_STATIC_PAD_TEMPLATE ("sink",
71 GST_STATIC_CAPS ("video/x-raw-yuv; video/x-raw-rgb; video/x-raw-gray"));
73 static GstStaticPadTemplate src_pad_template =
74 GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
75 GST_STATIC_CAPS ("video/x-raw-yuv; video/x-raw-rgb; video/x-raw-gray"));
77 GST_DEBUG_CATEGORY_STATIC (gst_image_freeze_debug);
78 #define GST_CAT_DEFAULT gst_image_freeze_debug
80 GST_BOILERPLATE (GstImageFreeze, gst_image_freeze, GstElement,
84 gst_image_freeze_base_init (gpointer g_class)
86 GstElementClass *gstelement_class = GST_ELEMENT_CLASS (g_class);
88 gst_element_class_set_details_simple (gstelement_class,
89 "Still frame stream generator",
91 "Generates a still frame stream from an image",
92 "Sebastian Dröge <sebastian.droege@collabora.co.uk>");
94 gst_element_class_add_pad_template (gstelement_class,
95 gst_static_pad_template_get (&sink_pad_template));
96 gst_element_class_add_pad_template (gstelement_class,
97 gst_static_pad_template_get (&src_pad_template));
101 gst_image_freeze_class_init (GstImageFreezeClass * klass)
103 GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
104 GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
106 gobject_class->finalize = gst_image_freeze_finalize;
108 gstelement_class->change_state =
109 GST_DEBUG_FUNCPTR (gst_image_freeze_change_state);
113 gst_image_freeze_init (GstImageFreeze * self, GstImageFreezeClass * g_class)
115 self->sinkpad = gst_pad_new_from_static_template (&sink_pad_template, "sink");
116 gst_pad_set_chain_function (self->sinkpad,
117 GST_DEBUG_FUNCPTR (gst_image_freeze_sink_chain));
118 gst_pad_set_event_function (self->sinkpad,
119 GST_DEBUG_FUNCPTR (gst_image_freeze_sink_event));
120 gst_pad_set_query_function (self->sinkpad,
121 GST_DEBUG_FUNCPTR (gst_image_freeze_sink_query));
122 gst_pad_set_setcaps_function (self->sinkpad,
123 GST_DEBUG_FUNCPTR (gst_image_freeze_sink_setcaps));
124 gst_pad_set_getcaps_function (self->sinkpad,
125 GST_DEBUG_FUNCPTR (gst_image_freeze_sink_getcaps));
126 gst_pad_set_bufferalloc_function (self->sinkpad,
127 GST_DEBUG_FUNCPTR (gst_image_freeze_sink_bufferalloc));
128 gst_element_add_pad (GST_ELEMENT (self), self->sinkpad);
130 self->srcpad = gst_pad_new_from_static_template (&src_pad_template, "src");
131 gst_pad_set_event_function (self->srcpad,
132 GST_DEBUG_FUNCPTR (gst_image_freeze_src_event));
133 gst_pad_set_query_function (self->srcpad,
134 GST_DEBUG_FUNCPTR (gst_image_freeze_src_query));
135 gst_pad_set_query_type_function (self->srcpad,
136 GST_DEBUG_FUNCPTR (gst_image_freeze_src_query_type));
137 gst_pad_use_fixed_caps (self->srcpad);
138 gst_element_add_pad (GST_ELEMENT (self), self->srcpad);
140 self->lock = g_mutex_new ();
142 gst_image_freeze_reset (self);
146 gst_image_freeze_finalize (GObject * object)
148 GstImageFreeze *self = GST_IMAGE_FREEZE (object);
150 gst_image_freeze_reset (self);
153 g_mutex_free (self->lock);
156 G_OBJECT_CLASS (parent_class)->finalize (object);
160 gst_image_freeze_reset (GstImageFreeze * self)
162 GST_DEBUG_OBJECT (self, "Resetting internal state");
164 g_mutex_lock (self->lock);
165 gst_buffer_replace (&self->buffer, NULL);
167 gst_segment_init (&self->segment, GST_FORMAT_TIME);
168 self->need_segment = TRUE;
169 gst_event_replace (&self->close_segment, NULL);
171 self->fps_n = self->fps_d = 0;
173 g_mutex_unlock (self->lock);
175 g_atomic_int_set (&self->seeking, 0);
179 gst_image_freeze_sink_setcaps (GstPad * pad, GstCaps * caps)
181 GstImageFreeze *self = GST_IMAGE_FREEZE (gst_pad_get_parent (pad));
182 gboolean ret = FALSE;
185 GstCaps *othercaps, *intersection;
188 caps = gst_caps_make_writable (gst_caps_ref (caps));
190 GST_DEBUG_OBJECT (pad, "Setting caps: %" GST_PTR_FORMAT, caps);
192 s = gst_caps_get_structure (caps, 0);
194 /* 1. Remove framerate */
195 gst_structure_remove_field (s, "framerate");
196 gst_structure_set (s, "framerate", GST_TYPE_FRACTION_RANGE, 0, 1, G_MAXINT, 1,
199 /* 2. Intersect with template caps */
200 othercaps = (GstCaps *) gst_pad_get_pad_template_caps (pad);
201 intersection = gst_caps_intersect (caps, othercaps);
202 GST_DEBUG_OBJECT (pad, "Intersecting: %" GST_PTR_FORMAT, caps);
203 GST_DEBUG_OBJECT (pad, "with: %" GST_PTR_FORMAT, othercaps);
204 GST_DEBUG_OBJECT (pad, "gave: %" GST_PTR_FORMAT, intersection);
205 gst_caps_unref (caps);
207 intersection = othercaps = NULL;
209 /* 3. Intersect with downstream peer caps */
210 othercaps = gst_pad_peer_get_caps (self->srcpad);
212 intersection = gst_caps_intersect (caps, othercaps);
213 GST_DEBUG_OBJECT (pad, "Intersecting: %" GST_PTR_FORMAT, caps);
214 GST_DEBUG_OBJECT (pad, "with: %" GST_PTR_FORMAT, othercaps);
215 GST_DEBUG_OBJECT (pad, "gave: %" GST_PTR_FORMAT, intersection);
216 gst_caps_unref (othercaps);
217 gst_caps_unref (caps);
219 intersection = othercaps = NULL;
222 /* 4. For every candidate check if it's accepted downstream
223 * and fixate framerate to nearest 25/1 */
224 n = gst_caps_get_size (caps);
225 for (i = 0; i < n; i++) {
226 GstCaps *candidate = gst_caps_new_empty ();
227 GstStructure *s = gst_structure_copy (gst_caps_get_structure (caps, i));
229 gst_caps_append_structure (candidate, s);
230 if (gst_pad_peer_accept_caps (self->srcpad, candidate)) {
231 if (gst_structure_has_field_typed (s, "framerate", GST_TYPE_FRACTION) ||
232 gst_structure_fixate_field_nearest_fraction (s, "framerate", 25, 1)) {
233 gst_structure_get_fraction (s, "framerate", &fps_n, &fps_d);
235 g_mutex_lock (self->lock);
238 g_mutex_unlock (self->lock);
239 GST_DEBUG_OBJECT (pad, "Setting caps %" GST_PTR_FORMAT, candidate);
240 gst_pad_set_caps (self->srcpad, candidate);
241 gst_caps_unref (candidate);
245 GST_WARNING_OBJECT (pad, "Invalid caps with framerate %d/%d", fps_n,
250 gst_caps_unref (candidate);
255 GST_ERROR_OBJECT (pad, "No usable caps found");
257 gst_caps_unref (caps);
258 gst_object_unref (self);
264 gst_image_freeze_sink_getcaps (GstPad * pad)
266 GstImageFreeze *self = GST_IMAGE_FREEZE (gst_pad_get_parent (pad));
270 if (GST_PAD_CAPS (pad)) {
271 ret = gst_caps_copy (GST_PAD_CAPS (pad));
275 tmp = gst_pad_peer_get_caps (self->srcpad);
277 ret = gst_caps_intersect (tmp, gst_pad_get_pad_template_caps (pad));
278 gst_caps_unref (tmp);
280 ret = gst_caps_copy (gst_pad_get_pad_template_caps (pad));
283 n = gst_caps_get_size (ret);
284 for (i = 0; i < n; i++) {
285 GstStructure *s = gst_caps_get_structure (ret, i);
287 gst_structure_remove_field (s, "framerate");
288 gst_structure_set (s, "framerate", GST_TYPE_FRACTION_RANGE, 0, 1, G_MAXINT,
293 gst_object_unref (self);
295 GST_LOG_OBJECT (pad, "Returning caps: %" GST_PTR_FORMAT, ret);
301 gst_image_freeze_sink_query (GstPad * pad, GstQuery * query)
303 GstImageFreeze *self = GST_IMAGE_FREEZE (gst_pad_get_parent (pad));
305 GstPad *peer = gst_pad_get_peer (self->srcpad);
307 GST_LOG_OBJECT (pad, "Handling query of type '%s'",
308 gst_query_type_get_name (GST_QUERY_TYPE (query)));
311 GST_INFO_OBJECT (pad, "No peer yet, dropping query");
314 ret = gst_pad_query (peer, query);
315 gst_object_unref (peer);
318 gst_object_unref (self);
323 gst_image_freeze_sink_bufferalloc (GstPad * pad, guint64 offset, guint size,
324 GstCaps * caps, GstBuffer ** buf)
326 GstImageFreeze *self = GST_IMAGE_FREEZE (gst_pad_get_parent (pad));
330 GST_LOG_OBJECT (pad, "Allocating buffer with offset 0x%" G_GINT64_MODIFIER
331 "x and size %u with caps: %" GST_PTR_FORMAT, offset, size, caps);
335 g_mutex_lock (self->lock);
336 do_alloc = self->buffer == NULL;
337 g_mutex_unlock (self->lock);
340 gboolean seeking = FALSE;
343 GST_PAD_STREAM_LOCK (self->srcpad);
344 ret = gst_pad_alloc_buffer (self->srcpad, offset, size, caps, buf);
346 seeking = ret == GST_FLOW_WRONG_STATE
347 && g_atomic_int_get (&self->seeking);
348 GST_PAD_STREAM_UNLOCK (self->srcpad);
351 if (G_UNLIKELY (ret != GST_FLOW_OK))
352 GST_ERROR_OBJECT (pad, "Allocating buffer failed: %s",
353 gst_flow_get_name (ret));
355 /* Let upstream go EOS if we already have a buffer */
359 gst_object_unref (self);
365 gst_image_freeze_convert (GstImageFreeze * self,
366 GstFormat src_format, gint64 src_value,
367 GstFormat * dest_format, gint64 * dest_value)
369 gboolean ret = FALSE;
371 if (src_format == *dest_format) {
372 *dest_value = src_value;
376 if (src_value == -1) {
381 switch (src_format) {
382 case GST_FORMAT_DEFAULT:{
383 switch (*dest_format) {
384 case GST_FORMAT_TIME:
385 g_mutex_lock (self->lock);
386 if (self->fps_n == 0)
390 gst_util_uint64_scale (src_value, GST_SECOND * self->fps_d,
392 g_mutex_unlock (self->lock);
400 case GST_FORMAT_TIME:{
401 switch (*dest_format) {
402 case GST_FORMAT_DEFAULT:
403 g_mutex_lock (self->lock);
405 gst_util_uint64_scale (src_value, self->fps_n,
406 self->fps_d * GST_SECOND);
407 g_mutex_unlock (self->lock);
422 static const GstQueryType *
423 gst_image_freeze_src_query_type (GstPad * pad)
425 static const GstQueryType types[] = {
437 gst_image_freeze_src_query (GstPad * pad, GstQuery * query)
439 GstImageFreeze *self = GST_IMAGE_FREEZE (gst_pad_get_parent (pad));
440 gboolean ret = FALSE;
442 GST_LOG_OBJECT (pad, "Handling query of type '%s'",
443 gst_query_type_get_name (GST_QUERY_TYPE (query)));
445 switch (GST_QUERY_TYPE (query)) {
446 case GST_QUERY_CONVERT:{
447 GstFormat src_format, dest_format;
448 gint64 src_value, dest_value;
450 gst_query_parse_convert (query, &src_format, &src_value, &dest_format,
453 gst_image_freeze_convert (self, src_format, src_value, &dest_format,
456 gst_query_set_convert (query, src_format, src_value, dest_format,
460 case GST_QUERY_POSITION:{
464 gst_query_parse_position (query, &format, NULL);
466 case GST_FORMAT_DEFAULT:{
467 g_mutex_lock (self->lock);
468 position = self->offset;
469 g_mutex_unlock (self->lock);
473 case GST_FORMAT_TIME:{
474 g_mutex_lock (self->lock);
475 position = self->segment.last_stop;
476 g_mutex_unlock (self->lock);
485 gst_query_set_position (query, format, position);
486 GST_DEBUG_OBJECT (pad,
487 "Returning position %" G_GINT64_FORMAT " in format %s", position,
488 gst_format_get_name (format));
490 GST_DEBUG_OBJECT (pad, "Position query failed");
494 case GST_QUERY_DURATION:{
498 gst_query_parse_duration (query, &format, NULL);
500 case GST_FORMAT_TIME:{
501 g_mutex_lock (self->lock);
502 duration = self->segment.stop;
503 g_mutex_unlock (self->lock);
507 case GST_FORMAT_DEFAULT:{
508 g_mutex_lock (self->lock);
509 duration = self->segment.stop;
512 gst_util_uint64_scale (duration, self->fps_n,
513 GST_SECOND * self->fps_d);
514 g_mutex_unlock (self->lock);
523 gst_query_set_duration (query, format, duration);
524 GST_DEBUG_OBJECT (pad,
525 "Returning duration %" G_GINT64_FORMAT " in format %s", duration,
526 gst_format_get_name (format));
528 GST_DEBUG_OBJECT (pad, "Duration query failed");
532 case GST_QUERY_SEEKING:{
536 gst_query_parse_seeking (query, &format, NULL, NULL, NULL);
537 seekable = (format == GST_FORMAT_TIME || format == GST_FORMAT_DEFAULT);
539 gst_query_set_seeking (query, format, seekable, (seekable ? 0 : -1), -1);
548 gst_object_unref (self);
554 gst_image_freeze_sink_event (GstPad * pad, GstEvent * event)
556 GstImageFreeze *self = GST_IMAGE_FREEZE (gst_pad_get_parent (pad));
559 GST_LOG_OBJECT (pad, "Got %s event", GST_EVENT_TYPE_NAME (event));
561 switch (GST_EVENT_TYPE (event)) {
564 /* if we receive EOS before a buffer arrives, then let it pass */
565 GST_DEBUG_OBJECT (self, "EOS without input buffer, passing on");
566 ret = gst_pad_push_event (self->srcpad, event);
570 case GST_EVENT_NEWSEGMENT:
571 GST_DEBUG_OBJECT (pad, "Dropping event");
572 gst_event_unref (event);
575 case GST_EVENT_FLUSH_START:
576 gst_image_freeze_reset (self);
579 ret = gst_pad_push_event (self->srcpad, event);
583 gst_object_unref (self);
588 gst_image_freeze_src_event (GstPad * pad, GstEvent * event)
590 GstImageFreeze *self = GST_IMAGE_FREEZE (gst_pad_get_parent (pad));
593 GST_LOG_OBJECT (pad, "Got %s event", GST_EVENT_TYPE_NAME (event));
595 switch (GST_EVENT_TYPE (event)) {
596 case GST_EVENT_NAVIGATION:
598 case GST_EVENT_LATENCY:
600 GST_DEBUG_OBJECT (pad, "Dropping event");
601 gst_event_unref (event);
604 case GST_EVENT_SEEK:{
608 GstSeekType start_type, stop_type;
614 gst_event_parse_seek (event, &rate, &format, &flags, &start_type, &start,
616 gst_event_unref (event);
618 flush = ! !(flags & GST_SEEK_FLAG_FLUSH);
620 if (format != GST_FORMAT_TIME && format != GST_FORMAT_DEFAULT) {
621 GST_ERROR_OBJECT (pad, "Seek in invalid format: %s",
622 gst_format_get_name (format));
627 if (format == GST_FORMAT_DEFAULT) {
628 format = GST_FORMAT_TIME;
629 if (!gst_image_freeze_convert (self, GST_FORMAT_DEFAULT, start, &format,
631 || !gst_image_freeze_convert (self, GST_FORMAT_DEFAULT, stop,
633 || start == -1 || stop == -1) {
634 GST_ERROR_OBJECT (pad,
635 "Failed to convert seek from DEFAULT format into TIME format");
644 g_atomic_int_set (&self->seeking, 1);
645 e = gst_event_new_flush_start ();
646 gst_pad_push_event (self->srcpad, e);
648 gst_pad_pause_task (self->srcpad);
651 GST_PAD_STREAM_LOCK (self->srcpad);
653 g_mutex_lock (self->lock);
654 gst_event_replace (&self->close_segment, NULL);
656 if (!self->need_segment && self->segment.rate >= 0) {
657 self->close_segment =
658 gst_event_new_new_segment_full (TRUE, self->segment.rate,
659 self->segment.applied_rate, self->segment.format,
660 self->segment.start, self->segment.last_stop, self->segment.time);
661 } else if (!self->need_segment) {
664 if ((stop = self->segment.stop) == -1)
665 stop = self->segment.duration;
667 self->close_segment =
668 gst_event_new_new_segment_full (TRUE, self->segment.rate,
669 self->segment.applied_rate, self->segment.format,
670 self->segment.last_stop, stop, self->segment.last_stop);
674 gst_segment_set_seek (&self->segment, rate, format, flags, start_type,
675 start, stop_type, stop, NULL);
676 self->need_segment = TRUE;
677 last_stop = self->segment.last_stop;
679 start_task = self->buffer != NULL;
680 g_mutex_unlock (self->lock);
685 e = gst_event_new_flush_stop ();
686 gst_pad_push_event (self->srcpad, e);
687 g_atomic_int_set (&self->seeking, 0);
690 if (flags & GST_SEEK_FLAG_SEGMENT) {
693 m = gst_message_new_segment_start (GST_OBJECT (self),
695 gst_element_post_message (GST_ELEMENT (self), m);
698 GST_PAD_STREAM_UNLOCK (self->srcpad);
700 GST_DEBUG_OBJECT (pad, "Seek successful");
703 g_mutex_lock (self->lock);
705 if (self->buffer != NULL)
706 gst_pad_start_task (self->srcpad,
707 (GstTaskFunction) gst_image_freeze_src_loop, self->srcpad);
709 g_mutex_unlock (self->lock);
715 case GST_EVENT_FLUSH_START:
716 gst_image_freeze_reset (self);
719 ret = gst_pad_push_event (self->sinkpad, event);
723 gst_object_unref (self);
728 gst_image_freeze_sink_chain (GstPad * pad, GstBuffer * buffer)
730 GstImageFreeze *self = GST_IMAGE_FREEZE (GST_PAD_PARENT (pad));
732 g_mutex_lock (self->lock);
734 GST_DEBUG_OBJECT (pad, "Already have a buffer, dropping");
735 gst_buffer_unref (buffer);
736 g_mutex_unlock (self->lock);
740 self->buffer = buffer;
742 gst_pad_start_task (self->srcpad, (GstTaskFunction) gst_image_freeze_src_loop,
744 g_mutex_unlock (self->lock);
749 gst_image_freeze_src_loop (GstPad * pad)
751 GstImageFreeze *self = GST_IMAGE_FREEZE (GST_PAD_PARENT (pad));
754 GstClockTime timestamp, timestamp_end;
755 gint64 cstart, cstop;
756 gboolean in_seg, eos;
758 g_mutex_lock (self->lock);
760 GST_ERROR_OBJECT (pad, "Have no buffer yet");
761 g_mutex_unlock (self->lock);
762 gst_pad_pause_task (self->srcpad);
765 buffer = gst_buffer_ref (self->buffer);
766 buffer = gst_buffer_make_metadata_writable (buffer);
767 g_mutex_unlock (self->lock);
769 if (self->close_segment) {
770 GST_DEBUG_OBJECT (pad, "Closing previous segment");
771 gst_pad_push_event (self->srcpad, self->close_segment);
772 self->close_segment = NULL;
775 if (self->need_segment) {
778 GST_DEBUG_OBJECT (pad, "Pushing NEWSEGMENT event: %" GST_SEGMENT_FORMAT,
780 e = gst_event_new_new_segment_full (FALSE, self->segment.rate,
781 self->segment.applied_rate, self->segment.format, self->segment.start,
782 self->segment.stop, self->segment.start);
784 g_mutex_lock (self->lock);
785 if (self->segment.rate >= 0) {
787 gst_util_uint64_scale (self->segment.start, self->fps_n,
788 self->fps_d * GST_SECOND);
791 gst_util_uint64_scale (self->segment.stop, self->fps_n,
792 self->fps_d * GST_SECOND);
794 g_mutex_unlock (self->lock);
796 self->need_segment = FALSE;
798 gst_pad_push_event (self->srcpad, e);
801 g_mutex_lock (self->lock);
802 offset = self->offset;
804 if (self->fps_n != 0) {
806 gst_util_uint64_scale (offset, self->fps_d * GST_SECOND, self->fps_n);
808 gst_util_uint64_scale (offset + 1, self->fps_d * GST_SECOND,
811 timestamp = self->segment.start;
812 timestamp_end = GST_CLOCK_TIME_NONE;
815 eos = (self->fps_n == 0 && offset > 0) ||
816 (self->segment.rate >= 0 && self->segment.stop != -1
817 && timestamp > self->segment.stop) || (self->segment.rate < 0
818 && offset == 0) || (self->segment.rate < 0
819 && self->segment.start != -1 && timestamp_end < self->segment.start);
821 if (self->fps_n == 0 && offset > 0)
825 gst_segment_clip (&self->segment, GST_FORMAT_TIME, timestamp,
826 timestamp_end, &cstart, &cstop);
829 gst_segment_set_last_stop (&self->segment, GST_FORMAT_TIME, cstart);
831 if (self->segment.rate >= 0)
835 g_mutex_unlock (self->lock);
837 GST_DEBUG_OBJECT (pad, "Handling buffer with timestamp %" GST_TIME_FORMAT,
838 GST_TIME_ARGS (timestamp));
843 GST_BUFFER_TIMESTAMP (buffer) = cstart;
844 GST_BUFFER_DURATION (buffer) = cstop - cstart;
845 GST_BUFFER_OFFSET (buffer) = offset;
846 GST_BUFFER_OFFSET_END (buffer) = offset + 1;
847 gst_buffer_set_caps (buffer, GST_PAD_CAPS (self->srcpad));
848 ret = gst_pad_push (self->srcpad, buffer);
849 GST_DEBUG_OBJECT (pad, "Pushing buffer resulted in %s",
850 gst_flow_get_name (ret));
851 if (ret != GST_FLOW_OK)
852 gst_pad_pause_task (self->srcpad);
854 gst_buffer_unref (buffer);
858 if ((self->segment.flags & GST_SEEK_FLAG_SEGMENT)) {
861 GST_DEBUG_OBJECT (pad, "Sending segment done at end of segment");
862 if (self->segment.rate >= 0)
863 m = gst_message_new_segment_done (GST_OBJECT_CAST (self),
864 GST_FORMAT_TIME, self->segment.stop);
866 m = gst_message_new_segment_done (GST_OBJECT_CAST (self),
867 GST_FORMAT_TIME, self->segment.start);
868 gst_element_post_message (GST_ELEMENT_CAST (self), m);
870 GST_DEBUG_OBJECT (pad, "Sending EOS at end of segment");
871 gst_pad_push_event (self->srcpad, gst_event_new_eos ());
873 gst_pad_pause_task (self->srcpad);
877 static GstStateChangeReturn
878 gst_image_freeze_change_state (GstElement * element, GstStateChange transition)
880 GstImageFreeze *self = GST_IMAGE_FREEZE (element);
881 GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
883 switch (transition) {
884 case GST_STATE_CHANGE_READY_TO_PAUSED:
885 gst_image_freeze_reset (self);
887 case GST_STATE_CHANGE_PAUSED_TO_READY:
888 gst_pad_stop_task (self->srcpad);
889 gst_image_freeze_reset (self);
895 if (GST_ELEMENT_CLASS (parent_class)->change_state)
896 ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
898 switch (transition) {
907 plugin_init (GstPlugin * plugin)
909 GST_DEBUG_CATEGORY_INIT (gst_image_freeze_debug, "imagefreeze", 0,
910 "imagefreeze element");
912 if (!gst_element_register (plugin, "imagefreeze", GST_RANK_NONE,
913 GST_TYPE_IMAGE_FREEZE))
919 GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
922 "Still frame stream generator",
923 plugin_init, VERSION, "LGPL", GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)