2 * Copyright (C) 2008 Nokia Corporation. (contact <stefan.kost@nokia.com>)
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Library General Public License for more details.
14 * You should have received a copy of the GNU Library General Public
15 * License along with this library; if not, write to the
16 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 * Boston, MA 02111-1307, USA.
21 * SECTION:element-output-selector
22 * @see_also: #GstOutputSelector, #GstInputSelector
24 * Direct input stream to one out of N output pads.
33 #include "gstoutputselector.h"
35 GST_DEBUG_CATEGORY_STATIC (output_selector_debug);
36 #define GST_CAT_DEFAULT output_selector_debug
38 static GstStaticPadTemplate gst_output_selector_sink_factory =
39 GST_STATIC_PAD_TEMPLATE ("sink",
44 static GstStaticPadTemplate gst_output_selector_src_factory =
45 GST_STATIC_PAD_TEMPLATE ("src%d",
58 #define _do_init(bla) \
59 GST_DEBUG_CATEGORY_INIT (output_selector_debug, \
60 "output-selector", 0, "An output stream selector element");
62 GST_BOILERPLATE_FULL (GstOutputSelector, gst_output_selector, GstElement,
63 GST_TYPE_ELEMENT, _do_init);
65 static void gst_output_selector_dispose (GObject * object);
66 static void gst_output_selector_set_property (GObject * object,
67 guint prop_id, const GValue * value, GParamSpec * pspec);
68 static void gst_output_selector_get_property (GObject * object,
69 guint prop_id, GValue * value, GParamSpec * pspec);
70 static GstPad *gst_output_selector_request_new_pad (GstElement * element,
71 GstPadTemplate * templ, const gchar * unused);
72 static void gst_output_selector_release_pad (GstElement * element,
74 static GstFlowReturn gst_output_selector_chain (GstPad * pad, GstBuffer * buf);
75 static GstFlowReturn gst_output_selector_buffer_alloc (GstPad * pad,
76 guint64 offset, guint size, GstCaps * caps, GstBuffer ** buf);
77 static GstStateChangeReturn gst_output_selector_change_state (GstElement *
78 element, GstStateChange transition);
79 static gboolean gst_output_selector_handle_sink_event (GstPad * pad,
83 gst_output_selector_base_init (gpointer g_class)
85 GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
87 gst_element_class_set_details_simple (element_class, "Output selector",
89 "1-to-N output stream selectoring",
90 "Stefan Kost <stefan.kost@nokia.com>");
91 gst_element_class_add_pad_template (element_class,
92 gst_static_pad_template_get (&gst_output_selector_sink_factory));
93 gst_element_class_add_pad_template (element_class,
94 gst_static_pad_template_get (&gst_output_selector_src_factory));
98 gst_output_selector_class_init (GstOutputSelectorClass * klass)
100 GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
101 GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
103 parent_class = g_type_class_peek_parent (klass);
105 gobject_class->dispose = gst_output_selector_dispose;
107 gobject_class->set_property =
108 GST_DEBUG_FUNCPTR (gst_output_selector_set_property);
109 gobject_class->get_property =
110 GST_DEBUG_FUNCPTR (gst_output_selector_get_property);
112 g_object_class_install_property (gobject_class, PROP_ACTIVE_PAD,
113 g_param_spec_object ("active-pad", "Active pad",
114 "Currently active src pad", GST_TYPE_PAD, G_PARAM_READWRITE));
115 g_object_class_install_property (gobject_class, PROP_RESEND_LATEST,
116 g_param_spec_boolean ("resend-latest", "Resend latest buffer",
117 "Resend latest buffer after a switch to a new pad", FALSE,
120 gstelement_class->request_new_pad =
121 GST_DEBUG_FUNCPTR (gst_output_selector_request_new_pad);
122 gstelement_class->release_pad =
123 GST_DEBUG_FUNCPTR (gst_output_selector_release_pad);
125 gstelement_class->change_state = gst_output_selector_change_state;
129 gst_output_selector_init (GstOutputSelector * sel,
130 GstOutputSelectorClass * g_class)
133 gst_pad_new_from_static_template (&gst_output_selector_sink_factory,
135 gst_pad_set_chain_function (sel->sinkpad,
136 GST_DEBUG_FUNCPTR (gst_output_selector_chain));
137 gst_pad_set_event_function (sel->sinkpad,
138 GST_DEBUG_FUNCPTR (gst_output_selector_handle_sink_event));
139 gst_pad_set_bufferalloc_function (sel->sinkpad,
140 GST_DEBUG_FUNCPTR (gst_output_selector_buffer_alloc));
142 gst_pad_set_setcaps_function (sel->sinkpad,
143 GST_DEBUG_FUNCPTR (gst_pad_proxy_setcaps));
144 gst_pad_set_getcaps_function (sel->sinkpad,
145 GST_DEBUG_FUNCPTR (gst_pad_proxy_getcaps));
148 gst_element_add_pad (GST_ELEMENT (sel), sel->sinkpad);
150 /* srcpad management */
151 sel->active_srcpad = NULL;
153 gst_segment_init (&sel->segment, GST_FORMAT_TIME);
154 sel->pending_srcpad = NULL;
156 sel->resend_latest = FALSE;
157 sel->latest_buffer = NULL;
161 gst_output_selector_reset (GstOutputSelector * osel)
163 if (osel->pending_srcpad != NULL) {
164 gst_object_unref (osel->pending_srcpad);
165 osel->pending_srcpad = NULL;
167 if (osel->latest_buffer != NULL) {
168 gst_buffer_unref (osel->latest_buffer);
169 osel->latest_buffer = NULL;
171 gst_segment_init (&osel->segment, GST_FORMAT_UNDEFINED);
175 gst_output_selector_dispose (GObject * object)
177 GstOutputSelector *osel = GST_OUTPUT_SELECTOR (object);
179 gst_output_selector_reset (osel);
181 G_OBJECT_CLASS (parent_class)->dispose (object);
185 gst_output_selector_set_property (GObject * object, guint prop_id,
186 const GValue * value, GParamSpec * pspec)
188 GstOutputSelector *sel = GST_OUTPUT_SELECTOR (object);
191 case PROP_ACTIVE_PAD:
195 next_pad = g_value_get_object (value);
197 GST_INFO_OBJECT (sel, "Activating pad %s:%s",
198 GST_DEBUG_PAD_NAME (next_pad));
200 GST_OBJECT_LOCK (object);
201 if (next_pad != sel->active_srcpad) {
202 /* switch to new srcpad in next chain run */
203 if (sel->pending_srcpad != NULL) {
204 GST_INFO ("replacing pending switch");
205 gst_object_unref (sel->pending_srcpad);
208 gst_object_ref (next_pad);
209 sel->pending_srcpad = next_pad;
211 GST_INFO ("pad already active");
212 if (sel->pending_srcpad != NULL) {
213 gst_object_unref (sel->pending_srcpad);
214 sel->pending_srcpad = NULL;
217 GST_OBJECT_UNLOCK (object);
220 case PROP_RESEND_LATEST:{
221 sel->resend_latest = g_value_get_boolean (value);
225 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
231 gst_output_selector_get_property (GObject * object, guint prop_id,
232 GValue * value, GParamSpec * pspec)
234 GstOutputSelector *sel = GST_OUTPUT_SELECTOR (object);
237 case PROP_ACTIVE_PAD:
238 GST_OBJECT_LOCK (object);
239 g_value_set_object (value,
240 sel->pending_srcpad ? sel->pending_srcpad : sel->active_srcpad);
241 GST_OBJECT_UNLOCK (object);
243 case PROP_RESEND_LATEST:{
244 GST_OBJECT_LOCK (object);
245 g_value_set_boolean (value, sel->resend_latest);
246 GST_OBJECT_UNLOCK (object);
250 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
256 gst_output_selector_buffer_alloc (GstPad * pad, guint64 offset, guint size,
257 GstCaps * caps, GstBuffer ** buf)
259 GstOutputSelector *sel;
263 sel = GST_OUTPUT_SELECTOR (GST_PAD_PARENT (pad));
264 res = GST_FLOW_NOT_LINKED;
266 GST_OBJECT_LOCK (sel);
267 allocpad = sel->pending_srcpad ? sel->pending_srcpad : sel->active_srcpad;
269 /* if we had a previous pad we used for allocating a buffer, continue using
271 GST_DEBUG_OBJECT (sel, "using pad %s:%s for alloc",
272 GST_DEBUG_PAD_NAME (allocpad));
273 gst_object_ref (allocpad);
274 GST_OBJECT_UNLOCK (sel);
276 res = gst_pad_alloc_buffer (allocpad, offset, size, caps, buf);
277 gst_object_unref (allocpad);
279 GST_OBJECT_LOCK (sel);
281 /* fallback case, allocate a buffer of our own, add pad caps. */
282 GST_DEBUG_OBJECT (pad, "fallback buffer alloc");
286 GST_OBJECT_UNLOCK (sel);
288 GST_DEBUG_OBJECT (sel, "buffer alloc finished: %s", gst_flow_get_name (res));
294 gst_output_selector_request_new_pad (GstElement * element,
295 GstPadTemplate * templ, const gchar * name)
299 GstOutputSelector *osel;
301 osel = GST_OUTPUT_SELECTOR (element);
303 GST_DEBUG_OBJECT (osel, "requesting pad");
305 GST_OBJECT_LOCK (osel);
306 padname = g_strdup_printf ("src%d", osel->nb_srcpads++);
307 srcpad = gst_pad_new_from_template (templ, padname);
308 GST_OBJECT_UNLOCK (osel);
310 gst_pad_set_active (srcpad, TRUE);
311 gst_element_add_pad (GST_ELEMENT (osel), srcpad);
313 /* Set the first requested src pad as active by default */
314 if (osel->active_srcpad == NULL) {
315 osel->active_srcpad = srcpad;
323 gst_output_selector_release_pad (GstElement * element, GstPad * pad)
325 GstOutputSelector *osel;
327 osel = GST_OUTPUT_SELECTOR (element);
329 GST_DEBUG_OBJECT (osel, "releasing pad");
331 gst_pad_set_active (pad, FALSE);
333 gst_element_remove_pad (GST_ELEMENT_CAST (osel), pad);
337 gst_output_selector_switch (GstOutputSelector * osel)
339 gboolean res = FALSE;
341 GstSegment *seg = NULL;
342 gint64 start = 0, position = 0;
345 GST_OBJECT_LOCK (GST_OBJECT (osel));
346 GST_INFO ("switching to pad %" GST_PTR_FORMAT, osel->pending_srcpad);
347 if (gst_pad_is_linked (osel->pending_srcpad)) {
348 osel->active_srcpad = osel->pending_srcpad;
351 gst_object_unref (osel->pending_srcpad);
352 osel->pending_srcpad = NULL;
353 GST_OBJECT_UNLOCK (GST_OBJECT (osel));
355 /* Send NEWSEGMENT event and latest buffer if switching succeeded */
357 /* Send NEWSEGMENT to the pad we are going to switch to */
358 seg = &osel->segment;
359 /* If resending then mark newsegment start and position accordingly */
360 if (osel->resend_latest && osel->latest_buffer &&
361 GST_BUFFER_TIMESTAMP_IS_VALID (osel->latest_buffer)) {
362 start = position = GST_BUFFER_TIMESTAMP (osel->latest_buffer);
364 start = position = seg->last_stop;
366 ev = gst_event_new_new_segment (TRUE, seg->rate,
367 seg->format, start, seg->stop, position);
368 if (!gst_pad_push_event (osel->active_srcpad, ev)) {
369 GST_WARNING_OBJECT (osel,
370 "newsegment handling failed in %" GST_PTR_FORMAT,
371 osel->active_srcpad);
374 /* Resend latest buffer to newly switched pad */
375 if (osel->resend_latest && osel->latest_buffer) {
376 GST_INFO ("resending latest buffer");
377 gst_pad_push (osel->active_srcpad, osel->latest_buffer);
378 osel->latest_buffer = NULL;
381 GST_WARNING_OBJECT (osel, "switch failed, pad not linked");
388 gst_output_selector_chain (GstPad * pad, GstBuffer * buf)
391 GstOutputSelector *osel;
392 GstClockTime last_stop, duration;
394 osel = GST_OUTPUT_SELECTOR (gst_pad_get_parent (pad));
396 if (osel->pending_srcpad) {
398 gst_output_selector_switch (osel);
401 if (osel->latest_buffer) {
402 gst_buffer_unref (osel->latest_buffer);
403 osel->latest_buffer = NULL;
406 if (osel->resend_latest) {
407 /* Keep reference to latest buffer to resend it after switch */
408 osel->latest_buffer = gst_buffer_ref (buf);
411 /* Keep track of last stop and use it in NEWSEGMENT start after
412 switching to a new src pad */
413 last_stop = GST_BUFFER_TIMESTAMP (buf);
414 if (GST_CLOCK_TIME_IS_VALID (last_stop)) {
415 duration = GST_BUFFER_DURATION (buf);
416 if (GST_CLOCK_TIME_IS_VALID (duration)) {
417 last_stop += duration;
419 GST_LOG_OBJECT (osel, "setting last stop %" GST_TIME_FORMAT,
420 GST_TIME_ARGS (last_stop));
421 gst_segment_set_last_stop (&osel->segment, osel->segment.format, last_stop);
424 GST_LOG_OBJECT (osel, "pushing buffer to %" GST_PTR_FORMAT,
425 osel->active_srcpad);
426 res = gst_pad_push (osel->active_srcpad, buf);
427 gst_object_unref (osel);
432 static GstStateChangeReturn
433 gst_output_selector_change_state (GstElement * element,
434 GstStateChange transition)
436 GstOutputSelector *sel;
437 GstStateChangeReturn result;
439 sel = GST_OUTPUT_SELECTOR (element);
441 switch (transition) {
442 case GST_STATE_CHANGE_READY_TO_PAUSED:
448 result = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
450 switch (transition) {
451 case GST_STATE_CHANGE_PAUSED_TO_READY:
452 gst_output_selector_reset (sel);
462 gst_output_selector_handle_sink_event (GstPad * pad, GstEvent * event)
465 GstOutputSelector *sel;
466 GstPad *output_pad = NULL;
468 sel = GST_OUTPUT_SELECTOR (gst_pad_get_parent (pad));
470 switch (GST_EVENT_TYPE (event)) {
471 case GST_EVENT_NEWSEGMENT:
476 gint64 start, stop, time;
478 gst_event_parse_new_segment_full (event, &update, &rate, &arate, &format,
479 &start, &stop, &time);
481 GST_DEBUG_OBJECT (sel,
482 "configured NEWSEGMENT update %d, rate %lf, applied rate %lf, "
483 "format %d, " "%" G_GINT64_FORMAT " -- %" G_GINT64_FORMAT ", time %"
484 G_GINT64_FORMAT, update, rate, arate, format, start, stop, time);
486 gst_segment_set_newsegment_full (&sel->segment, update,
487 rate, arate, format, start, stop, time);
489 /* Send newsegment to all src pads */
490 gst_pad_event_default (pad, event);
494 /* Send eos to all src pads */
495 gst_pad_event_default (pad, event);
498 /* Send other events to pending or active src pad */
500 sel->pending_srcpad ? sel->pending_srcpad : sel->active_srcpad;
501 res = gst_pad_push_event (output_pad, event);
505 gst_object_unref (sel);