1 /* gst-freeze -- Source freezer
2 * Copyright (C) 2005 Gergely Nagy <gergely.nagy@neteyes.hu>
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public License
6 * version 2.1, as published by the Free Software Foundation.
8 * This library is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * Lesser General Public License for more details.
13 * You should have received a copy of the GNU Lesser General Public
14 * License along with this library; if not, write to the Free Software
15 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 * SECTION:element-freeze
21 * Makes a stream from buffers of data.
24 * <title>Example launch line</title>
27 * gst-launch-0.10 filesrc location=gnome-home.png blocksize=4135 ! pngdec ! freeze ! ffmpegcolorspace ! xvimagesink
28 * ]| Produces a video stream from one picture.
38 #include "gstfreeze.h"
40 GST_DEBUG_CATEGORY_STATIC (freeze_debug);
41 #define GST_CAT_DEFAULT freeze_debug
49 static GstStaticPadTemplate gst_freeze_src_template =
50 GST_STATIC_PAD_TEMPLATE ("src",
55 static GstStaticPadTemplate gst_freeze_sink_template =
56 GST_STATIC_PAD_TEMPLATE ("sink",
61 static void gst_freeze_dispose (GObject * object);
62 static void gst_freeze_set_property (GObject * object, guint prop_id,
63 const GValue * value, GParamSpec * pspec);
64 static void gst_freeze_get_property (GObject * object, guint prop_id,
65 GValue * value, GParamSpec * pspec);
66 static GstFlowReturn gst_freeze_chain (GstPad * pad, GstBuffer * buffer);
67 static GstStateChangeReturn gst_freeze_change_state (GstElement * element,
68 GstStateChange transition);
69 static GstFlowReturn gst_freeze_play (GstPad * pad, GstBuffer * buff);
70 static void gst_freeze_loop (GstPad * pad);
71 static gboolean gst_freeze_sink_activate (GstPad * sinkpad);
72 static gboolean gst_freeze_sink_activate_pull (GstPad * sinkpad,
74 static gboolean gst_freeze_sink_event (GstPad * pad, GstEvent * event);
75 static void gst_freeze_clear_buffer (GstFreeze * freeze);
76 static void gst_freeze_buffer_free (gpointer data, gpointer user_data);
79 GST_BOILERPLATE (GstFreeze, gst_freeze, GstElement, GST_TYPE_ELEMENT);
82 gst_freeze_base_init (gpointer klass)
84 GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
86 gst_element_class_set_details_simple (element_class, "Stream freezer",
88 "Makes a stream from buffers of data",
89 "Gergely Nagy <gergely.nagy@neteyes.hu>,"
90 " Renato Filho <renato.filho@indt.org.br>");
92 gst_element_class_add_static_pad_template (element_class,
93 &gst_freeze_sink_template);
94 gst_element_class_add_static_pad_template (element_class,
95 &gst_freeze_src_template);
100 gst_freeze_class_init (GstFreezeClass * klass)
102 GObjectClass *object_class = G_OBJECT_CLASS (klass);
103 GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
105 element_class->change_state = gst_freeze_change_state;
106 object_class->set_property = gst_freeze_set_property;
107 object_class->get_property = gst_freeze_get_property;
109 g_object_class_install_property (object_class,
111 g_param_spec_uint ("max-buffers",
113 "Maximum number of buffers", 0, G_MAXUINT, 1,
114 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
116 object_class->dispose = gst_freeze_dispose;
121 gst_freeze_init (GstFreeze * freeze, GstFreezeClass * klass)
124 gst_pad_new_from_static_template (&gst_freeze_sink_template, "sink");
125 gst_element_add_pad (GST_ELEMENT (freeze), freeze->sinkpad);
126 gst_pad_set_activate_function (freeze->sinkpad, gst_freeze_sink_activate);
127 gst_pad_set_activatepull_function (freeze->sinkpad,
128 gst_freeze_sink_activate_pull);
129 gst_pad_set_chain_function (freeze->sinkpad, gst_freeze_chain);
130 gst_pad_set_getcaps_function (freeze->sinkpad, gst_pad_proxy_getcaps);
131 gst_pad_set_event_function (freeze->sinkpad, gst_freeze_sink_event);
134 gst_pad_new_from_static_template (&gst_freeze_src_template, "src");
135 gst_element_add_pad (GST_ELEMENT (freeze), freeze->srcpad);
136 gst_pad_set_getcaps_function (freeze->srcpad, gst_pad_proxy_getcaps);
138 freeze->timestamp_offset = 0;
139 freeze->running_time = 0;
140 freeze->current = NULL;
141 freeze->max_buffers = 1;
142 freeze->on_flush = FALSE;
143 freeze->buffers = g_queue_new ();
147 gst_freeze_dispose (GObject * object)
149 GstFreeze *freeze = GST_FREEZE (object);
151 gst_freeze_clear_buffer (freeze);
153 g_queue_free (freeze->buffers);
155 G_OBJECT_CLASS (parent_class)->dispose (object);
159 gst_freeze_set_property (GObject * object, guint prop_id,
160 const GValue * value, GParamSpec * pspec)
162 GstFreeze *freeze = GST_FREEZE (object);
165 case ARG_MAX_BUFFERS:
166 freeze->max_buffers = g_value_get_uint (value);
169 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
175 gst_freeze_get_property (GObject * object, guint prop_id,
176 GValue * value, GParamSpec * pspec)
178 GstFreeze *freeze = GST_FREEZE (object);
181 case ARG_MAX_BUFFERS:
182 g_value_set_uint (value, freeze->max_buffers);
185 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
191 gst_freeze_chain (GstPad * pad, GstBuffer * buffer)
193 return gst_freeze_play (pad, buffer);
197 static GstStateChangeReturn
198 gst_freeze_change_state (GstElement * element, GstStateChange transition)
200 GstFreeze *freeze = GST_FREEZE (element);
201 GstStateChangeReturn return_val = GST_STATE_CHANGE_SUCCESS;
203 switch (transition) {
204 case GST_STATE_CHANGE_READY_TO_PAUSED:
206 case GST_STATE_CHANGE_NULL_TO_READY:
207 case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
208 freeze->timestamp_offset = freeze->running_time = 0;
214 if (GST_ELEMENT_CLASS (parent_class)->change_state)
216 GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
218 switch (transition) {
219 case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
220 case GST_STATE_CHANGE_READY_TO_NULL:
222 case GST_STATE_CHANGE_PAUSED_TO_READY:
223 freeze->timestamp_offset = freeze->running_time = 0;
233 gst_freeze_play (GstPad * pad, GstBuffer * buff)
236 GstFlowReturn ret = GST_FLOW_OK;
238 freeze = GST_FREEZE (gst_pad_get_parent (pad));
240 if (freeze->on_flush) {
241 g_object_unref (freeze);
242 return GST_FLOW_WRONG_STATE;
245 /* If it is working in push mode this function will be called by "_chain"
246 and buff will never be NULL. In pull mode this function will be called
247 by _loop and buff will be NULL */
250 gst_pad_pull_range (GST_PAD (freeze->sinkpad), freeze->offset, 4096,
252 if (ret != GST_FLOW_OK) {
253 gst_object_unref (freeze);
257 freeze->offset += GST_BUFFER_SIZE (buff);
261 if (g_queue_get_length (freeze->buffers) < freeze->max_buffers ||
262 freeze->max_buffers == 0) {
263 g_queue_push_tail (freeze->buffers, buff);
264 GST_DEBUG_OBJECT (freeze, "accepted buffer %u",
265 g_queue_get_length (freeze->buffers) - 1);
267 gst_buffer_unref (buff);
271 if (freeze->current != NULL) {
272 GST_DEBUG_OBJECT (freeze, "switching to next buffer");
273 freeze->current = g_queue_peek_nth (freeze->buffers,
274 g_queue_index (freeze->buffers, (gpointer) freeze->current) + 1);
277 if (freeze->current == NULL) {
278 if (freeze->max_buffers > 1)
279 GST_DEBUG_OBJECT (freeze, "restarting the loop");
280 freeze->current = g_queue_peek_head (freeze->buffers);
283 GST_BUFFER_TIMESTAMP (freeze->current) = freeze->timestamp_offset +
284 freeze->running_time;
285 freeze->running_time += GST_BUFFER_DURATION (freeze->current);
287 gst_buffer_ref (freeze->current);
288 ret = gst_pad_push (freeze->srcpad, freeze->current);
290 gst_object_unref (freeze);
296 gst_freeze_loop (GstPad * pad)
298 gst_freeze_play (pad, NULL);
302 gst_freeze_sink_activate (GstPad * sinkpad)
304 if (gst_pad_check_pull_range (sinkpad)) {
305 return gst_pad_activate_pull (sinkpad, TRUE);
307 return gst_pad_activate_push (sinkpad, TRUE);
312 gst_freeze_sink_activate_pull (GstPad * sinkpad, gboolean active)
317 /* if we have a scheduler we can start the task */
318 result = gst_pad_start_task (sinkpad,
319 (GstTaskFunction) gst_freeze_loop, sinkpad);
321 result = gst_pad_stop_task (sinkpad);
328 gst_freeze_buffer_free (gpointer data, gpointer user_data)
330 gst_buffer_unref (GST_BUFFER (data));
334 gst_freeze_clear_buffer (GstFreeze * freeze)
336 if (freeze->buffers != NULL) {
337 g_queue_foreach (freeze->buffers, gst_freeze_buffer_free, NULL);
339 freeze->current = NULL;
340 freeze->running_time = 0;
344 gst_freeze_sink_event (GstPad * pad, GstEvent * event)
347 GstFreeze *freeze = GST_FREEZE (gst_pad_get_parent (pad));
350 switch (GST_EVENT_TYPE (event)) {
352 GST_DEBUG_OBJECT (freeze, "EOS on sink pad %s",
353 gst_pad_get_name (GST_PAD (freeze->sinkpad)));
354 gst_event_unref (event);
356 case GST_EVENT_NEWSEGMENT:
358 case GST_EVENT_FLUSH_STOP:
359 gst_freeze_clear_buffer (freeze);
362 ret = gst_pad_event_default (GST_PAD (freeze->sinkpad), event);
366 gst_object_unref (freeze);
372 plugin_init (GstPlugin * plugin)
374 GST_DEBUG_CATEGORY_INIT (freeze_debug, "freeze", 0, "Stream freezer");
376 return gst_element_register (plugin, "freeze", GST_RANK_NONE,
380 GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
384 plugin_init, VERSION, GST_LICENSE, GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN);
391 * arch-tag: fb0ee62b-cf74-46c0-8e62-93b58bacc0ed