2 * Copyright (C) 2005 Wim Taymans <wim@fluendo.com>
4 * gstbasesink.c: Base class for sink elements
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Library General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Library General Public License for more details.
16 * You should have received a copy of the GNU Library General Public
17 * License along with this library; if not, write to the
18 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19 * Boston, MA 02111-1307, USA.
24 * @short_description: Base class for sink elements
25 * @see_also: #GstBaseTransform, #GstBaseSource
27 * GstBaseSink is the base class for sink elements in GStreamer, such as
28 * xvimagesink or filesink. It is a layer on top of #GstElement that provides a
29 * simplified interface to plugin writers. GstBaseSink handles many details for
30 * you, for example preroll, clock synchronization, state changes, activation in
31 * push or pull mode, and queries. In most cases, when writing sink elements,
32 * there is no need to implement class methods from #GstElement or to set
33 * functions on pads, because the GstBaseSink infrastructure is sufficient.
35 * There is only support in GstBaseSink for one sink pad, which should be named
36 * "sink". A sink implementation (subclass of GstBaseSink) should install a pad
37 * template in its base_init function, like so:
40 * my_element_base_init (gpointer g_class)
42 * GstElementClass *gstelement_class = GST_ELEMENT_CLASS (g_class);
44 * // sinktemplate should be a #GstStaticPadTemplate with direction
45 * // #GST_PAD_SINK and name "sink"
46 * gst_element_class_add_pad_template (gstelement_class,
47 * gst_static_pad_template_get (&sinktemplate));
48 * // see #GstElementDetails
49 * gst_element_class_set_details (gstelement_class, &details);
53 * The one method which all subclasses of GstBaseSink must implement is
54 * GstBaseSink::render. This method will be called...
58 * event(): mostly useful for file-like sinks (seeking or flushing)
60 * get_caps/set_caps/buffer_alloc
62 * start/stop for resource allocation
64 * unlock if you block on an fd, for example
66 * get_times i'm sure is for something :P
68 * provide example of textsink
70 * admonishment not to try to implement your own sink with prerolling...
72 * extending via subclassing, setting pad functions, gstelement vmethods.
79 #include "gstbasesink.h"
80 #include <gst/gstmarshal.h>
81 #include <gst/gst-i18n-lib.h>
83 GST_DEBUG_CATEGORY_STATIC (gst_base_sink_debug);
84 #define GST_CAT_DEFAULT gst_base_sink_debug
86 /* BaseSink signals and properties */
94 #define DEFAULT_SIZE 1024
95 #define DEFAULT_CAN_ACTIVATE_PULL FALSE /* fixme: enable me */
96 #define DEFAULT_CAN_ACTIVATE_PUSH TRUE
98 #define DEFAULT_SYNC TRUE
103 PROP_PREROLL_QUEUE_LEN,
107 static GstElementClass *parent_class = NULL;
109 static void gst_base_sink_base_init (gpointer g_class);
110 static void gst_base_sink_class_init (GstBaseSinkClass * klass);
111 static void gst_base_sink_init (GstBaseSink * trans, gpointer g_class);
112 static void gst_base_sink_finalize (GObject * object);
115 gst_base_sink_get_type (void)
117 static GType base_sink_type = 0;
119 if (!base_sink_type) {
120 static const GTypeInfo base_sink_info = {
121 sizeof (GstBaseSinkClass),
122 (GBaseInitFunc) gst_base_sink_base_init,
124 (GClassInitFunc) gst_base_sink_class_init,
127 sizeof (GstBaseSink),
129 (GInstanceInitFunc) gst_base_sink_init,
132 base_sink_type = g_type_register_static (GST_TYPE_ELEMENT,
133 "GstBaseSink", &base_sink_info, G_TYPE_FLAG_ABSTRACT);
135 return base_sink_type;
138 static void gst_base_sink_set_clock (GstElement * element, GstClock * clock);
140 static void gst_base_sink_set_property (GObject * object, guint prop_id,
141 const GValue * value, GParamSpec * pspec);
142 static void gst_base_sink_get_property (GObject * object, guint prop_id,
143 GValue * value, GParamSpec * pspec);
145 static gboolean gst_base_sink_send_event (GstElement * element,
147 static gboolean gst_base_sink_query (GstElement * element, GstQuery * query);
149 static GstCaps *gst_base_sink_get_caps (GstBaseSink * sink);
150 static gboolean gst_base_sink_set_caps (GstBaseSink * sink, GstCaps * caps);
151 static GstFlowReturn gst_base_sink_buffer_alloc (GstBaseSink * sink,
152 guint64 offset, guint size, GstCaps * caps, GstBuffer ** buf);
153 static void gst_base_sink_get_times (GstBaseSink * basesink, GstBuffer * buffer,
154 GstClockTime * start, GstClockTime * end);
156 static GstStateChangeReturn gst_base_sink_change_state (GstElement * element,
157 GstStateChange transition);
159 static GstFlowReturn gst_base_sink_chain (GstPad * pad, GstBuffer * buffer);
160 static void gst_base_sink_loop (GstPad * pad);
161 static gboolean gst_base_sink_activate (GstPad * pad);
162 static gboolean gst_base_sink_activate_push (GstPad * pad, gboolean active);
163 static gboolean gst_base_sink_activate_pull (GstPad * pad, gboolean active);
164 static gboolean gst_base_sink_event (GstPad * pad, GstEvent * event);
165 static inline GstFlowReturn gst_base_sink_handle_buffer (GstBaseSink * basesink,
167 static inline gboolean gst_base_sink_handle_event (GstBaseSink * basesink,
171 gst_base_sink_base_init (gpointer g_class)
173 GST_DEBUG_CATEGORY_INIT (gst_base_sink_debug, "basesink", 0,
178 gst_base_sink_class_init (GstBaseSinkClass * klass)
180 GObjectClass *gobject_class;
181 GstElementClass *gstelement_class;
183 gobject_class = (GObjectClass *) klass;
184 gstelement_class = (GstElementClass *) klass;
186 parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
188 gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_base_sink_finalize);
189 gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_base_sink_set_property);
190 gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_base_sink_get_property);
192 /* FIXME, this next value should be configured using an event from the
193 * upstream element */
194 g_object_class_install_property (G_OBJECT_CLASS (klass),
195 PROP_PREROLL_QUEUE_LEN,
196 g_param_spec_uint ("preroll-queue-len", "preroll-queue-len",
197 "Number of buffers to queue during preroll", 0, G_MAXUINT, 0,
198 G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
199 g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_SYNC,
200 g_param_spec_boolean ("sync", "Sync", "Sync on the clock", DEFAULT_SYNC,
203 gstelement_class->set_clock = GST_DEBUG_FUNCPTR (gst_base_sink_set_clock);
204 gstelement_class->change_state =
205 GST_DEBUG_FUNCPTR (gst_base_sink_change_state);
206 gstelement_class->send_event = GST_DEBUG_FUNCPTR (gst_base_sink_send_event);
207 gstelement_class->query = GST_DEBUG_FUNCPTR (gst_base_sink_query);
209 klass->get_caps = GST_DEBUG_FUNCPTR (gst_base_sink_get_caps);
210 klass->set_caps = GST_DEBUG_FUNCPTR (gst_base_sink_set_caps);
211 klass->buffer_alloc = GST_DEBUG_FUNCPTR (gst_base_sink_buffer_alloc);
212 klass->get_times = GST_DEBUG_FUNCPTR (gst_base_sink_get_times);
216 gst_base_sink_pad_getcaps (GstPad * pad)
218 GstBaseSinkClass *bclass;
220 GstCaps *caps = NULL;
222 bsink = GST_BASE_SINK (gst_pad_get_parent (pad));
223 bclass = GST_BASE_SINK_GET_CLASS (bsink);
224 if (bclass->get_caps)
225 caps = bclass->get_caps (bsink);
228 GstPadTemplate *pad_template;
231 gst_element_class_get_pad_template (GST_ELEMENT_CLASS (bclass), "sink");
232 if (pad_template != NULL) {
233 caps = gst_caps_ref (gst_pad_template_get_caps (pad_template));
236 gst_object_unref (bsink);
242 gst_base_sink_pad_setcaps (GstPad * pad, GstCaps * caps)
244 GstBaseSinkClass *bclass;
246 gboolean res = FALSE;
248 bsink = GST_BASE_SINK (gst_pad_get_parent (pad));
249 bclass = GST_BASE_SINK_GET_CLASS (bsink);
251 if (bclass->set_caps)
252 res = bclass->set_caps (bsink, caps);
254 gst_object_unref (bsink);
260 gst_base_sink_pad_buffer_alloc (GstPad * pad, guint64 offset, guint size,
261 GstCaps * caps, GstBuffer ** buf)
263 GstBaseSinkClass *bclass;
265 GstFlowReturn result = GST_FLOW_OK;
267 bsink = GST_BASE_SINK (gst_pad_get_parent (pad));
268 bclass = GST_BASE_SINK_GET_CLASS (bsink);
270 if (bclass->buffer_alloc)
271 result = bclass->buffer_alloc (bsink, offset, size, caps, buf);
273 *buf = NULL; /* fallback in gstpad.c will allocate generic buffer */
275 gst_object_unref (bsink);
281 gst_base_sink_init (GstBaseSink * basesink, gpointer g_class)
283 GstPadTemplate *pad_template;
286 gst_element_class_get_pad_template (GST_ELEMENT_CLASS (g_class), "sink");
287 g_return_if_fail (pad_template != NULL);
289 basesink->sinkpad = gst_pad_new_from_template (pad_template, "sink");
291 gst_pad_set_getcaps_function (basesink->sinkpad,
292 GST_DEBUG_FUNCPTR (gst_base_sink_pad_getcaps));
293 gst_pad_set_setcaps_function (basesink->sinkpad,
294 GST_DEBUG_FUNCPTR (gst_base_sink_pad_setcaps));
295 gst_pad_set_bufferalloc_function (basesink->sinkpad,
296 GST_DEBUG_FUNCPTR (gst_base_sink_pad_buffer_alloc));
297 gst_pad_set_activate_function (basesink->sinkpad,
298 GST_DEBUG_FUNCPTR (gst_base_sink_activate));
299 gst_pad_set_activatepush_function (basesink->sinkpad,
300 GST_DEBUG_FUNCPTR (gst_base_sink_activate_push));
301 gst_pad_set_activatepull_function (basesink->sinkpad,
302 GST_DEBUG_FUNCPTR (gst_base_sink_activate_pull));
303 gst_pad_set_event_function (basesink->sinkpad,
304 GST_DEBUG_FUNCPTR (gst_base_sink_event));
305 gst_pad_set_chain_function (basesink->sinkpad,
306 GST_DEBUG_FUNCPTR (gst_base_sink_chain));
307 gst_element_add_pad (GST_ELEMENT (basesink), basesink->sinkpad);
309 basesink->pad_mode = GST_ACTIVATE_NONE;
310 GST_PAD_TASK (basesink->sinkpad) = NULL;
311 basesink->preroll_queue = g_queue_new ();
313 basesink->can_activate_push = DEFAULT_CAN_ACTIVATE_PUSH;
314 basesink->can_activate_pull = DEFAULT_CAN_ACTIVATE_PULL;
316 basesink->sync = DEFAULT_SYNC;
318 GST_OBJECT_FLAG_SET (basesink, GST_ELEMENT_IS_SINK);
322 gst_base_sink_finalize (GObject * object)
324 GstBaseSink *basesink;
326 basesink = GST_BASE_SINK (object);
328 g_queue_free (basesink->preroll_queue);
330 G_OBJECT_CLASS (parent_class)->finalize (object);
334 gst_base_sink_set_clock (GstElement * element, GstClock * clock)
338 sink = GST_BASE_SINK (element);
344 gst_base_sink_set_property (GObject * object, guint prop_id,
345 const GValue * value, GParamSpec * pspec)
347 GstBaseSink *sink = GST_BASE_SINK (object);
350 case PROP_PREROLL_QUEUE_LEN:
351 /* preroll lock necessary to serialize with finish_preroll */
352 GST_PAD_PREROLL_LOCK (sink->sinkpad);
353 sink->preroll_queue_max_len = g_value_get_uint (value);
354 GST_PAD_PREROLL_UNLOCK (sink->sinkpad);
357 sink->sync = g_value_get_boolean (value);
360 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
366 gst_base_sink_get_property (GObject * object, guint prop_id, GValue * value,
369 GstBaseSink *sink = GST_BASE_SINK (object);
371 GST_OBJECT_LOCK (sink);
373 case PROP_PREROLL_QUEUE_LEN:
374 g_value_set_uint (value, sink->preroll_queue_max_len);
377 g_value_set_boolean (value, sink->sync);
380 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
383 GST_OBJECT_UNLOCK (sink);
387 gst_base_sink_get_caps (GstBaseSink * sink)
393 gst_base_sink_set_caps (GstBaseSink * sink, GstCaps * caps)
399 gst_base_sink_buffer_alloc (GstBaseSink * sink, guint64 offset, guint size,
400 GstCaps * caps, GstBuffer ** buf)
406 /* with PREROLL_LOCK */
408 gst_base_sink_preroll_queue_empty (GstBaseSink * basesink, GstPad * pad)
411 GQueue *q = basesink->preroll_queue;
417 GST_DEBUG_OBJECT (basesink, "emptying queue");
418 while ((obj = g_queue_pop_head (q))) {
421 is_buffer = GST_IS_BUFFER (obj);
422 if (G_LIKELY (is_buffer)) {
423 basesink->preroll_queued--;
424 basesink->buffers_queued--;
426 switch (GST_EVENT_TYPE (obj)) {
428 basesink->preroll_queued--;
433 basesink->events_queued--;
435 /* we release the preroll lock while pushing so that we
436 * can still flush it while blocking on the clock or
437 * inside the element. */
438 GST_PAD_PREROLL_UNLOCK (pad);
440 if (G_LIKELY (is_buffer)) {
441 GST_DEBUG_OBJECT (basesink, "popped buffer %p", obj);
442 ret = gst_base_sink_handle_buffer (basesink, GST_BUFFER_CAST (obj));
444 GST_DEBUG_OBJECT (basesink, "popped event %p", obj);
445 gst_base_sink_handle_event (basesink, GST_EVENT_CAST (obj));
449 GST_PAD_PREROLL_LOCK (pad);
451 GST_DEBUG_OBJECT (basesink, "queue empty");
456 /* with PREROLL_LOCK */
458 gst_base_sink_preroll_queue_flush (GstBaseSink * basesink, GstPad * pad)
461 GQueue *q = basesink->preroll_queue;
463 GST_DEBUG_OBJECT (basesink, "flushing queue %p", basesink);
465 while ((obj = g_queue_pop_head (q))) {
466 GST_DEBUG_OBJECT (basesink, "popped %p", obj);
467 gst_mini_object_unref (obj);
470 /* we can't have EOS anymore now */
471 basesink->eos = FALSE;
472 basesink->eos_queued = FALSE;
473 basesink->preroll_queued = 0;
474 basesink->buffers_queued = 0;
475 basesink->events_queued = 0;
476 basesink->have_preroll = FALSE;
477 /* and signal any waiters now */
478 GST_PAD_PREROLL_SIGNAL (pad);
481 /* with PREROLL_LOCK */
483 gst_base_sink_commit_state (GstBaseSink * basesink)
485 /* commit state and proceed to next pending state */
487 GstState current, next, pending, post_pending;
489 gboolean post_paused = FALSE;
490 gboolean post_playing = FALSE;
492 GST_OBJECT_LOCK (basesink);
493 current = GST_STATE (basesink);
494 next = GST_STATE_NEXT (basesink);
495 pending = GST_STATE_PENDING (basesink);
496 post_pending = pending;
499 case GST_STATE_PLAYING:
500 basesink->need_preroll = FALSE;
502 /* post PAUSED too when we were READY */
503 if (current == GST_STATE_READY) {
507 case GST_STATE_PAUSED:
508 basesink->need_preroll = TRUE;
510 post_pending = GST_STATE_VOID_PENDING;
512 case GST_STATE_READY:
518 if (pending != GST_STATE_VOID_PENDING) {
519 GST_STATE (basesink) = pending;
520 GST_STATE_NEXT (basesink) = GST_STATE_VOID_PENDING;
521 GST_STATE_PENDING (basesink) = GST_STATE_VOID_PENDING;
522 GST_STATE_RETURN (basesink) = GST_STATE_CHANGE_SUCCESS;
524 GST_OBJECT_UNLOCK (basesink);
527 message = gst_message_new_state_changed (GST_OBJECT_CAST (basesink),
528 current, next, post_pending);
529 gst_element_post_message (GST_ELEMENT_CAST (basesink), message);
532 message = gst_message_new_state_changed (GST_OBJECT_CAST (basesink),
533 next, pending, GST_STATE_VOID_PENDING);
534 gst_element_post_message (GST_ELEMENT_CAST (basesink), message);
537 if (post_paused || post_playing) {
538 gst_element_post_message (GST_ELEMENT_CAST (basesink),
539 gst_message_new_state_dirty (GST_OBJECT_CAST (basesink)));
542 GST_STATE_BROADCAST (basesink);
548 /* app is going to READY */
549 GST_OBJECT_UNLOCK (basesink);
554 /* with STREAM_LOCK */
556 gst_base_sink_handle_object (GstBaseSink * basesink, GstPad * pad,
563 GST_PAD_PREROLL_LOCK (pad);
564 /* push object on the queue */
565 GST_DEBUG_OBJECT (basesink, "push %p on preroll_queue", obj);
566 g_queue_push_tail (basesink->preroll_queue, obj);
568 have_event = GST_IS_EVENT (obj);
570 GstEvent *event = GST_EVENT (obj);
572 switch (GST_EVENT_TYPE (obj)) {
574 basesink->preroll_queued++;
575 basesink->eos = TRUE;
576 basesink->eos_queued = TRUE;
578 case GST_EVENT_NEWSEGMENT:
587 /* the newsegment event is needed to bring the buffer timestamps to the
588 * stream time and to drop samples outside of the playback segment. */
589 gst_event_parse_new_segment (event, &update, &rate, &format,
590 &start, &stop, &time);
592 basesink->have_newsegment = TRUE;
594 gst_segment_set_newsegment (&basesink->segment, update, rate, format,
597 GST_DEBUG_OBJECT (basesink,
598 "received NEWSEGMENT %" GST_TIME_FORMAT " -- %"
599 GST_TIME_FORMAT ", time %" GST_TIME_FORMAT ", accum %"
601 GST_TIME_ARGS (basesink->segment.start),
602 GST_TIME_ARGS (basesink->segment.stop),
603 GST_TIME_ARGS (basesink->segment.time),
604 GST_TIME_ARGS (basesink->segment.accum));
610 basesink->events_queued++;
612 GstBuffer *buf = GST_BUFFER (obj);
614 if (!basesink->have_newsegment) {
615 GST_ELEMENT_WARNING (basesink, STREAM, FAILED,
616 (_("Internal data flow problem.")),
617 ("Received buffer without a new-segment. Cannot sync to clock."));
618 basesink->have_newsegment = TRUE;
619 /* this means this sink will not be able to sync to the clock */
620 basesink->segment.start = -1;
621 basesink->segment.stop = -1;
624 /* check if the buffer needs to be dropped */
626 GstClockTime start = -1, end = -1;
628 /* we don't use the subclassed method as it may not return
629 * valid values for our purpose here */
630 gst_base_sink_get_times (basesink, buf, &start, &end);
632 GST_DEBUG_OBJECT (basesink, "got times start: %" GST_TIME_FORMAT
633 ", end: %" GST_TIME_FORMAT, GST_TIME_ARGS (start),
634 GST_TIME_ARGS (end));
636 if (GST_CLOCK_TIME_IS_VALID (start)) {
637 if (!gst_segment_clip (&basesink->segment, GST_FORMAT_TIME,
638 (gint64) start, (gint64) end, NULL, NULL))
642 basesink->preroll_queued++;
643 basesink->buffers_queued++;
646 GST_DEBUG_OBJECT (basesink,
647 "now %d preroll, %d buffers, %d events on queue",
648 basesink->preroll_queued,
649 basesink->buffers_queued, basesink->events_queued);
651 /* check if we are prerolling */
652 if (!basesink->need_preroll)
655 /* there is a buffer queued */
656 if (basesink->buffers_queued == 1) {
657 GST_DEBUG_OBJECT (basesink, "do preroll %p", obj);
659 /* if it's a buffer, we need to call the preroll method */
660 if (GST_IS_BUFFER (obj)) {
661 GstBaseSinkClass *bclass;
662 GstBuffer *buf = GST_BUFFER (obj);
664 GST_DEBUG_OBJECT (basesink, "preroll buffer %" GST_TIME_FORMAT,
665 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)));
667 bclass = GST_BASE_SINK_GET_CLASS (basesink);
669 if ((ret = bclass->preroll (basesink, buf)) != GST_FLOW_OK)
673 length = basesink->preroll_queued;
674 GST_DEBUG_OBJECT (basesink, "prerolled length %d", length);
678 basesink->have_preroll = TRUE;
681 if (!gst_base_sink_commit_state (basesink))
684 GST_OBJECT_LOCK (pad);
685 if (G_UNLIKELY (GST_PAD_IS_FLUSHING (pad)))
687 GST_OBJECT_UNLOCK (pad);
689 /* it is possible that commiting the state made us go to PLAYING
690 * now in which case we don't need to block anymore. */
691 if (!basesink->need_preroll)
694 length = basesink->preroll_queued;
696 /* FIXME: a pad probe could have made us lose the buffer, according
697 * to one of the python tests */
699 GST_ERROR_OBJECT (basesink,
700 "preroll_queued dropped from 1 to 0 while committing state change");
702 g_assert (length <= 1);
705 /* see if we need to block now. We cannot block on events, only
706 * on buffers, the reason is that events can be sent from the
707 * application thread and we don't want to block there. */
708 if (length > basesink->preroll_queue_max_len && !have_event) {
709 /* block until the state changes, or we get a flush, or something */
710 GST_DEBUG_OBJECT (basesink, "waiting to finish preroll");
711 GST_PAD_PREROLL_WAIT (pad);
712 GST_DEBUG_OBJECT (basesink, "done preroll");
713 GST_OBJECT_LOCK (pad);
714 if (G_UNLIKELY (GST_PAD_IS_FLUSHING (pad)))
716 GST_OBJECT_UNLOCK (pad);
718 GST_PAD_PREROLL_UNLOCK (pad);
724 GST_DEBUG_OBJECT (basesink, "no preroll needed");
725 /* maybe it was another sink that blocked in preroll, need to check for
727 basesink->have_preroll = FALSE;
728 ret = gst_base_sink_preroll_queue_empty (basesink, pad);
729 GST_PAD_PREROLL_UNLOCK (pad);
737 buf = GST_BUFFER (g_queue_pop_tail (basesink->preroll_queue));
739 gst_buffer_unref (buf);
740 GST_PAD_PREROLL_UNLOCK (pad);
746 GST_OBJECT_UNLOCK (pad);
747 gst_base_sink_preroll_queue_flush (basesink, pad);
748 GST_PAD_PREROLL_UNLOCK (pad);
749 GST_DEBUG_OBJECT (basesink, "pad is flushing");
751 return GST_FLOW_WRONG_STATE;
755 GST_PAD_PREROLL_UNLOCK (pad);
756 GST_DEBUG_OBJECT (basesink, "stopping");
758 return GST_FLOW_WRONG_STATE;
762 GST_DEBUG_OBJECT (basesink, "preroll failed");
763 gst_base_sink_preroll_queue_flush (basesink, pad);
765 GST_DEBUG_OBJECT (basesink, "abort state");
766 gst_element_abort_state (GST_ELEMENT (basesink));
773 gst_base_sink_event (GstPad * pad, GstEvent * event)
775 GstBaseSink *basesink;
776 gboolean result = TRUE;
777 GstBaseSinkClass *bclass;
779 basesink = GST_BASE_SINK (gst_pad_get_parent (pad));
781 bclass = GST_BASE_SINK_GET_CLASS (basesink);
783 GST_DEBUG_OBJECT (basesink, "event %p", event);
785 switch (GST_EVENT_TYPE (event)) {
790 /* EOS also finishes the preroll */
792 gst_base_sink_handle_object (basesink, pad, GST_MINI_OBJECT (event));
795 case GST_EVENT_NEWSEGMENT:
800 gst_base_sink_handle_object (basesink, pad, GST_MINI_OBJECT (event));
803 case GST_EVENT_FLUSH_START:
804 /* make sure we are not blocked on the clock also clear any pending
807 bclass->event (basesink, event);
809 GST_OBJECT_LOCK (basesink);
810 basesink->flushing = TRUE;
811 if (basesink->clock_id) {
812 gst_clock_id_unschedule (basesink->clock_id);
814 GST_OBJECT_UNLOCK (basesink);
816 GST_PAD_PREROLL_LOCK (pad);
817 /* we need preroll after the flush */
818 GST_DEBUG_OBJECT (basesink, "flushing, need preroll after flush");
819 basesink->need_preroll = TRUE;
820 /* unlock from a possible state change/preroll */
821 gst_base_sink_preroll_queue_flush (basesink, pad);
822 GST_PAD_PREROLL_UNLOCK (pad);
824 /* and we need to commit our state again on the next
825 * prerolled buffer */
826 GST_PAD_STREAM_LOCK (pad);
827 gst_element_lost_state (GST_ELEMENT (basesink));
828 GST_PAD_STREAM_UNLOCK (pad);
829 GST_DEBUG_OBJECT (basesink, "event unref %p %p", basesink, event);
830 gst_event_unref (event);
832 case GST_EVENT_FLUSH_STOP:
834 bclass->event (basesink, event);
836 /* now we are completely unblocked and the _chain method
838 GST_OBJECT_LOCK (basesink);
839 basesink->flushing = FALSE;
840 GST_OBJECT_UNLOCK (basesink);
841 /* we need new segment info after the flush. */
842 gst_segment_init (&basesink->segment, GST_FORMAT_TIME);
844 GST_DEBUG_OBJECT (basesink, "event unref %p %p", basesink, event);
845 gst_event_unref (event);
848 gst_event_unref (event);
851 gst_object_unref (basesink);
856 /* default implementation to calculate the start and end
857 * timestamps on a buffer, subclasses can override
860 gst_base_sink_get_times (GstBaseSink * basesink, GstBuffer * buffer,
861 GstClockTime * start, GstClockTime * end)
863 GstClockTime timestamp, duration;
865 timestamp = GST_BUFFER_TIMESTAMP (buffer);
866 if (GST_CLOCK_TIME_IS_VALID (timestamp)) {
868 /* get duration to calculate end time */
869 duration = GST_BUFFER_DURATION (buffer);
870 if (GST_CLOCK_TIME_IS_VALID (duration)) {
871 *end = timestamp + duration;
877 /* with STREAM_LOCK and LOCK*/
878 static GstClockReturn
879 gst_base_sink_wait (GstBaseSink * basesink, GstClockTime time)
884 /* no need to attempt a clock wait if we are flushing */
885 if (basesink->flushing) {
886 return GST_CLOCK_UNSCHEDULED;
889 /* clock_id should be NULL outside of this function */
890 g_assert (basesink->clock_id == NULL);
891 g_assert (GST_CLOCK_TIME_IS_VALID (time));
893 id = gst_clock_new_single_shot_id (basesink->clock, time);
895 basesink->clock_id = id;
896 /* release the object lock while waiting */
897 GST_OBJECT_UNLOCK (basesink);
899 ret = gst_clock_id_wait (id, NULL);
901 GST_OBJECT_LOCK (basesink);
902 gst_clock_id_unref (id);
903 basesink->clock_id = NULL;
908 /* perform synchronisation on a buffer
910 * 1) check if we have a clock, if not, do nothing
911 * 2) calculate the start and end time of the buffer
912 * 3) create a single shot notification to wait on
913 * the clock, save the entry so we can unlock it
914 * 4) wait on the clock, this blocks
915 * 5) unref the clockid again
917 static GstClockReturn
918 gst_base_sink_do_sync (GstBaseSink * basesink, GstBuffer * buffer)
920 GstClockReturn result = GST_CLOCK_OK;
921 GstClockTime start, end;
923 GstBaseSinkClass *bclass;
925 bclass = GST_BASE_SINK_GET_CLASS (basesink);
928 if (bclass->get_times)
929 bclass->get_times (basesink, buffer, &start, &end);
931 GST_DEBUG_OBJECT (basesink, "got times start: %" GST_TIME_FORMAT
932 ", end: %" GST_TIME_FORMAT, GST_TIME_ARGS (start), GST_TIME_ARGS (end));
934 /* if we don't have a timestamp, we don't sync */
935 if (!GST_CLOCK_TIME_IS_VALID (start)) {
936 GST_DEBUG_OBJECT (basesink, "start not valid");
940 /* save last times seen. */
941 if (GST_CLOCK_TIME_IS_VALID (end))
942 gst_segment_set_last_stop (&basesink->segment, GST_FORMAT_TIME,
945 gst_segment_set_last_stop (&basesink->segment, GST_FORMAT_TIME,
949 if (!gst_segment_clip (&basesink->segment, GST_FORMAT_TIME,
950 (gint64) start, (gint64) end, &cstart, &cend))
953 if (!basesink->sync) {
954 GST_DEBUG_OBJECT (basesink, "no need to sync");
958 /* now do clocking */
959 if (basesink->clock) {
960 GstClockTime base_time;
961 GstClockTimeDiff stream_start, stream_end;
964 gst_segment_to_running_time (&basesink->segment, GST_FORMAT_TIME,
967 gst_segment_to_running_time (&basesink->segment, GST_FORMAT_TIME, cend);
969 GST_OBJECT_LOCK (basesink);
971 base_time = GST_ELEMENT_CAST (basesink)->base_time;
973 GST_LOG_OBJECT (basesink,
974 "waiting for clock, base time %" GST_TIME_FORMAT
975 " stream_start %" GST_TIME_FORMAT,
976 GST_TIME_ARGS (base_time), GST_TIME_ARGS (stream_start));
978 /* also save end_time of this buffer so that we can wait
980 if (GST_CLOCK_TIME_IS_VALID (stream_end))
981 basesink->end_time = stream_end + base_time;
983 basesink->end_time = GST_CLOCK_TIME_NONE;
985 result = gst_base_sink_wait (basesink, stream_start + base_time);
987 GST_OBJECT_UNLOCK (basesink);
989 GST_LOG_OBJECT (basesink, "clock entry done: %d", result);
991 GST_DEBUG_OBJECT (basesink, "no clock, not syncing");
999 GST_LOG_OBJECT (basesink, "buffer skipped, not in segment");
1000 return GST_CLOCK_UNSCHEDULED;
1007 * 2) render the event
1008 * 3) unref the event
1010 static inline gboolean
1011 gst_base_sink_handle_event (GstBaseSink * basesink, GstEvent * event)
1013 GstBaseSinkClass *bclass;
1016 switch (GST_EVENT_TYPE (event)) {
1018 GST_OBJECT_LOCK (basesink);
1019 if (basesink->clock) {
1020 /* wait for last buffer to finish if we have a valid end time */
1021 if (GST_CLOCK_TIME_IS_VALID (basesink->end_time)) {
1022 gst_base_sink_wait (basesink, basesink->end_time);
1023 basesink->end_time = GST_CLOCK_TIME_NONE;
1026 GST_OBJECT_UNLOCK (basesink);
1032 bclass = GST_BASE_SINK_GET_CLASS (basesink);
1034 ret = bclass->event (basesink, event);
1038 switch (GST_EVENT_TYPE (event)) {
1040 GST_PAD_PREROLL_LOCK (basesink->sinkpad);
1041 /* if we are still EOS, we can post the EOS message */
1042 if (basesink->eos) {
1043 /* ok, now we can post the message */
1044 GST_DEBUG_OBJECT (basesink, "Now posting EOS");
1045 gst_element_post_message (GST_ELEMENT_CAST (basesink),
1046 gst_message_new_eos (GST_OBJECT_CAST (basesink)));
1047 basesink->eos_queued = FALSE;
1049 GST_PAD_PREROLL_UNLOCK (basesink->sinkpad);
1055 GST_DEBUG_OBJECT (basesink, "event unref %p %p", basesink, event);
1056 gst_event_unref (event);
1063 * 1) first sync on the buffer
1064 * 2) render the buffer
1065 * 3) unref the buffer
1067 static inline GstFlowReturn
1068 gst_base_sink_handle_buffer (GstBaseSink * basesink, GstBuffer * buf)
1070 GstFlowReturn ret = GST_FLOW_OK;
1071 GstClockReturn status;
1073 status = gst_base_sink_do_sync (basesink, buf);
1075 case GST_CLOCK_EARLY:
1076 GST_DEBUG_OBJECT (basesink, "buffer too late!, rendering anyway");
1077 /* fallthrough for now */
1080 GstBaseSinkClass *bclass;
1082 bclass = GST_BASE_SINK_GET_CLASS (basesink);
1084 ret = bclass->render (basesink, buf);
1088 GST_DEBUG_OBJECT (basesink, "clock returned %d, not rendering", status);
1092 GST_DEBUG_OBJECT (basesink, "buffer unref after render %p", basesink, buf);
1093 gst_buffer_unref (buf);
1098 static GstFlowReturn
1099 gst_base_sink_chain (GstPad * pad, GstBuffer * buf)
1101 GstBaseSink *basesink;
1102 GstFlowReturn result;
1104 basesink = GST_BASE_SINK (gst_pad_get_parent (pad));
1106 if (!(basesink->pad_mode == GST_ACTIVATE_PUSH)) {
1107 GST_OBJECT_LOCK (pad);
1108 g_warning ("Push on pad %s:%s, but it was not activated in push mode",
1109 GST_DEBUG_PAD_NAME (pad));
1110 GST_OBJECT_UNLOCK (pad);
1111 result = GST_FLOW_UNEXPECTED;
1116 gst_base_sink_handle_object (basesink, pad, GST_MINI_OBJECT_CAST (buf));
1119 gst_object_unref (basesink);
1125 gst_base_sink_loop (GstPad * pad)
1127 GstBaseSink *basesink;
1128 GstBuffer *buf = NULL;
1129 GstFlowReturn result;
1131 basesink = GST_BASE_SINK (gst_pad_get_parent (pad));
1133 g_assert (basesink->pad_mode == GST_ACTIVATE_PULL);
1135 result = gst_pad_pull_range (pad, basesink->offset, DEFAULT_SIZE, &buf);
1136 if (result != GST_FLOW_OK)
1139 result = gst_base_sink_handle_object (basesink, pad, GST_MINI_OBJECT (buf));
1140 if (result != GST_FLOW_OK)
1143 gst_object_unref (basesink);
1150 gst_base_sink_event (pad, gst_event_new_eos ());
1151 gst_object_unref (basesink);
1152 gst_pad_pause_task (pad);
1158 gst_base_sink_deactivate (GstBaseSink * basesink, GstPad * pad)
1160 gboolean result = FALSE;
1161 GstBaseSinkClass *bclass;
1163 bclass = GST_BASE_SINK_GET_CLASS (basesink);
1165 /* step 1, unblock clock sync (if any) or any other blocking thing */
1166 GST_PAD_PREROLL_LOCK (pad);
1167 GST_OBJECT_LOCK (basesink);
1168 if (basesink->clock_id) {
1169 gst_clock_id_unschedule (basesink->clock_id);
1171 GST_OBJECT_UNLOCK (basesink);
1173 /* unlock any subclasses */
1175 bclass->unlock (basesink);
1177 /* flush out the data thread if it's locked in finish_preroll */
1178 GST_DEBUG_OBJECT (basesink,
1179 "flushing out data thread, need preroll to FALSE");
1180 basesink->need_preroll = FALSE;
1181 gst_base_sink_preroll_queue_flush (basesink, pad);
1182 GST_PAD_PREROLL_SIGNAL (pad);
1183 GST_PAD_PREROLL_UNLOCK (pad);
1185 /* step 2, make sure streaming finishes */
1186 result = gst_pad_stop_task (pad);
1192 gst_base_sink_activate (GstPad * pad)
1194 gboolean result = FALSE;
1195 GstBaseSink *basesink;
1197 basesink = GST_BASE_SINK (gst_pad_get_parent (pad));
1199 GST_DEBUG_OBJECT (basesink, "Trying pull mode first");
1201 if (basesink->can_activate_pull && gst_pad_check_pull_range (pad)
1202 && gst_pad_activate_pull (pad, TRUE)) {
1203 GST_DEBUG_OBJECT (basesink, "Success activating pull mode");
1206 GST_DEBUG_OBJECT (basesink, "Falling back to push mode");
1207 if (gst_pad_activate_push (pad, TRUE)) {
1208 GST_DEBUG_OBJECT (basesink, "Success activating push mode");
1214 GST_WARNING_OBJECT (basesink, "Could not activate pad in either mode");
1217 gst_object_unref (basesink);
1223 gst_base_sink_activate_push (GstPad * pad, gboolean active)
1226 GstBaseSink *basesink;
1228 basesink = GST_BASE_SINK (gst_pad_get_parent (pad));
1231 if (!basesink->can_activate_push) {
1233 basesink->pad_mode = GST_ACTIVATE_NONE;
1236 basesink->pad_mode = GST_ACTIVATE_PUSH;
1239 if (G_UNLIKELY (basesink->pad_mode != GST_ACTIVATE_PUSH)) {
1240 g_warning ("Internal GStreamer activation error!!!");
1243 result = gst_base_sink_deactivate (basesink, pad);
1244 basesink->pad_mode = GST_ACTIVATE_NONE;
1248 gst_object_unref (basesink);
1253 /* this won't get called until we implement an activate function */
1255 gst_base_sink_activate_pull (GstPad * pad, gboolean active)
1257 gboolean result = FALSE;
1258 GstBaseSink *basesink;
1260 basesink = GST_BASE_SINK (gst_pad_get_parent (pad));
1263 if (!basesink->can_activate_pull) {
1265 basesink->pad_mode = GST_ACTIVATE_NONE;
1267 GstPad *peer = gst_pad_get_peer (pad);
1269 if (G_UNLIKELY (peer == NULL)) {
1270 g_warning ("Trying to activate pad in pull mode, but no peer");
1272 basesink->pad_mode = GST_ACTIVATE_NONE;
1274 if (gst_pad_activate_pull (peer, TRUE)) {
1275 basesink->have_newsegment = TRUE;
1276 gst_segment_init (&basesink->segment, GST_FORMAT_TIME);
1278 /* set the pad mode before starting the task so that it's in the
1279 correct state for the new thread... */
1280 basesink->pad_mode = GST_ACTIVATE_PULL;
1282 gst_pad_start_task (pad, (GstTaskFunction) gst_base_sink_loop,
1284 /* but if starting the thread fails, set it back */
1286 basesink->pad_mode = GST_ACTIVATE_NONE;
1288 GST_DEBUG_OBJECT (pad, "Failed to activate peer in pull mode");
1290 basesink->pad_mode = GST_ACTIVATE_NONE;
1292 gst_object_unref (peer);
1296 if (G_UNLIKELY (basesink->pad_mode != GST_ACTIVATE_PULL)) {
1297 g_warning ("Internal GStreamer activation error!!!");
1300 basesink->have_newsegment = FALSE;
1301 result = gst_base_sink_deactivate (basesink, pad);
1302 basesink->pad_mode = GST_ACTIVATE_NONE;
1306 gst_object_unref (basesink);
1312 gst_base_sink_send_event (GstElement * element, GstEvent * event)
1315 GstBaseSink *basesink = GST_BASE_SINK (element);
1318 GST_OBJECT_LOCK (element);
1319 pad = basesink->sinkpad;
1320 gst_object_ref (pad);
1321 GST_OBJECT_UNLOCK (element);
1323 result = gst_pad_push_event (pad, event);
1325 gst_object_unref (pad);
1331 gst_base_sink_peer_query (GstBaseSink * sink, GstQuery * query)
1334 gboolean res = FALSE;
1336 if ((peer = gst_pad_get_peer (sink->sinkpad))) {
1337 res = gst_pad_query (peer, query);
1338 gst_object_unref (peer);
1344 gst_base_sink_get_position (GstBaseSink * basesink, GstFormat format,
1348 gboolean res = FALSE;
1351 case GST_FORMAT_TIME:
1353 /* we can answer time format */
1354 GST_OBJECT_LOCK (basesink);
1355 if ((clock = GST_ELEMENT_CLOCK (basesink))) {
1359 gst_object_ref (clock);
1360 GST_OBJECT_UNLOCK (basesink);
1362 now = gst_clock_get_time (clock);
1364 GST_OBJECT_LOCK (basesink);
1365 if (GST_CLOCK_TIME_IS_VALID (basesink->segment.time))
1366 time = basesink->segment.time;
1370 *cur = now - GST_ELEMENT_CAST (basesink)->base_time -
1371 basesink->segment.accum + time;
1373 GST_DEBUG_OBJECT (basesink,
1374 "now %" GST_TIME_FORMAT " + segment_time %" GST_TIME_FORMAT " = %"
1375 GST_TIME_FORMAT, GST_TIME_ARGS (now),
1376 GST_TIME_ARGS (time), GST_TIME_ARGS (*cur));
1378 gst_object_unref (clock);
1382 GST_OBJECT_UNLOCK (basesink);
1391 gst_base_sink_query (GstElement * element, GstQuery * query)
1393 gboolean res = FALSE;
1395 GstBaseSink *basesink = GST_BASE_SINK (element);
1397 switch (GST_QUERY_TYPE (query)) {
1398 case GST_QUERY_POSITION:
1404 GST_PAD_PREROLL_LOCK (basesink->sinkpad);
1405 eos = basesink->eos;
1406 GST_PAD_PREROLL_UNLOCK (basesink->sinkpad);
1409 res = gst_base_sink_peer_query (basesink, query);
1411 gst_query_parse_position (query, &format, NULL);
1413 GST_DEBUG_OBJECT (basesink, "current position format %d", format);
1415 if ((res = gst_base_sink_get_position (basesink, format, &cur))) {
1416 gst_query_set_position (query, format, cur);
1418 res = gst_base_sink_peer_query (basesink, query);
1423 case GST_QUERY_DURATION:
1424 res = gst_base_sink_peer_query (basesink, query);
1426 case GST_QUERY_LATENCY:
1428 case GST_QUERY_JITTER:
1430 case GST_QUERY_RATE:
1431 //gst_query_set_rate (query, basesink->segment_rate);
1434 case GST_QUERY_SEGMENT:
1436 /* FIXME, bring start/stop to stream time */
1437 gst_query_set_segment (query, basesink->segment.rate,
1438 GST_FORMAT_TIME, basesink->segment.start, basesink->segment.stop);
1441 case GST_QUERY_SEEKING:
1442 case GST_QUERY_CONVERT:
1443 case GST_QUERY_FORMATS:
1445 res = gst_base_sink_peer_query (basesink, query);
1451 static GstStateChangeReturn
1452 gst_base_sink_change_state (GstElement * element, GstStateChange transition)
1454 GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
1455 GstBaseSink *basesink = GST_BASE_SINK (element);
1456 GstBaseSinkClass *bclass;
1458 bclass = GST_BASE_SINK_GET_CLASS (basesink);
1460 switch (transition) {
1461 case GST_STATE_CHANGE_NULL_TO_READY:
1463 if (!bclass->start (basesink))
1466 case GST_STATE_CHANGE_READY_TO_PAUSED:
1467 /* need to complete preroll before this state change completes, there
1468 * is no data flow in READY so we can safely assume we need to preroll. */
1469 basesink->offset = 0;
1470 GST_PAD_PREROLL_LOCK (basesink->sinkpad);
1471 basesink->have_preroll = FALSE;
1472 GST_DEBUG_OBJECT (basesink, "READY to PAUSED, need preroll to FALSE");
1473 basesink->need_preroll = TRUE;
1474 GST_PAD_PREROLL_UNLOCK (basesink->sinkpad);
1475 gst_segment_init (&basesink->segment, GST_FORMAT_TIME);
1476 basesink->have_newsegment = FALSE;
1477 ret = GST_STATE_CHANGE_ASYNC;
1479 case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
1480 GST_PAD_PREROLL_LOCK (basesink->sinkpad);
1481 /* no preroll needed */
1482 basesink->need_preroll = FALSE;
1484 /* if we have EOS, we should empty the queue now as there will
1485 * be no more data received in the chain function.
1486 * FIXME, this could block the state change function too long when
1487 * we are pushing and syncing the buffers, better start a new
1488 * thread to do this. */
1489 if (basesink->eos) {
1490 gboolean do_eos = !basesink->eos_queued;
1492 gst_base_sink_preroll_queue_empty (basesink, basesink->sinkpad);
1494 /* need to post EOS message here if it was not in the preroll queue we
1497 GST_DEBUG_OBJECT (basesink, "Now posting EOS");
1498 gst_element_post_message (GST_ELEMENT_CAST (basesink),
1499 gst_message_new_eos (GST_OBJECT_CAST (basesink)));
1501 } else if (!basesink->have_preroll) {
1502 /* queue a commit_state */
1503 basesink->need_preroll = TRUE;
1504 GST_DEBUG_OBJECT (basesink,
1505 "PAUSED to PLAYING, !eos, !have_preroll, need preroll to FALSE");
1506 ret = GST_STATE_CHANGE_ASYNC;
1507 /* we know it's not waiting, no need to signal */
1509 GST_DEBUG_OBJECT (basesink,
1510 "PAUSED to PLAYING, !eos, have_preroll, need preroll to FALSE");
1511 /* now let it play */
1512 GST_PAD_PREROLL_SIGNAL (basesink->sinkpad);
1514 GST_PAD_PREROLL_UNLOCK (basesink->sinkpad);
1521 GstStateChangeReturn bret;
1523 bret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
1524 if (bret == GST_STATE_CHANGE_FAILURE)
1525 goto activate_failed;
1528 switch (transition) {
1529 case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
1531 GstBaseSinkClass *bclass;
1533 bclass = GST_BASE_SINK_GET_CLASS (basesink);
1535 GST_PAD_PREROLL_LOCK (basesink->sinkpad);
1536 GST_OBJECT_LOCK (basesink);
1537 /* unlock clock wait if any */
1538 if (basesink->clock_id) {
1539 gst_clock_id_unschedule (basesink->clock_id);
1541 GST_OBJECT_UNLOCK (basesink);
1543 /* unlock any subclasses */
1545 bclass->unlock (basesink);
1547 /* if we don't have a preroll buffer and we have not received EOS,
1548 * we need to wait for a preroll */
1549 GST_DEBUG_OBJECT (basesink, "have_preroll: %d, EOS: %d",
1550 basesink->have_preroll, basesink->eos);
1551 if (!basesink->have_preroll && !basesink->eos
1552 && GST_STATE_PENDING (basesink) == GST_STATE_PAUSED) {
1553 GST_DEBUG_OBJECT (basesink, "PLAYING to PAUSED, need preroll to TRUE");
1554 basesink->need_preroll = TRUE;
1555 ret = GST_STATE_CHANGE_ASYNC;
1557 GST_PAD_PREROLL_UNLOCK (basesink->sinkpad);
1560 case GST_STATE_CHANGE_PAUSED_TO_READY:
1562 case GST_STATE_CHANGE_READY_TO_NULL:
1564 if (!bclass->stop (basesink)) {
1565 GST_WARNING ("failed to stop");
1577 GST_DEBUG_OBJECT (basesink, "failed to start");
1578 return GST_STATE_CHANGE_FAILURE;
1582 GST_DEBUG_OBJECT (basesink,
1583 "element failed to change states -- activation problem?");
1584 return GST_STATE_CHANGE_FAILURE;