2 * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
3 * 2000,2005 Wim Taymans <wim@fluendo.com>
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Library General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Library General Public License for more details.
17 * You should have received a copy of the GNU Library General Public
18 * License along with this library; if not, write to the
19 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
20 * Boston, MA 02111-1307, USA.
25 * @short_description: Base class for getrange based source elements
26 * @see_also: #GstPushSrc, #GstBaseTransform, #GstBaseSink
28 * This is a generice base class for source elements. The following
29 * types of sources are supported:
31 * <listitem><para>random access sources like files</para></listitem>
32 * <listitem><para>seekable sources</para></listitem>
33 * <listitem><para>live sources</para></listitem>
36 * The source can be configured to operate in any #GstFormat with the
37 * gst_base_src_set_format() method. The currently set format determines
38 * the format of the internal #GstSegment and any #GST_EVENT_NEWSEGMENT
39 * events. The default format for #GstBaseSrc is #GST_FORMAT_BYTES.
41 * #GstBaseSrc always supports push mode scheduling. If the following
42 * conditions are met, it also supports pull mode scheduling:
44 * <listitem><para>The format is set to #GST_FORMAT_BYTES (default).</para>
46 * <listitem><para>#GstBaseSrcClass.is_seekable() returns %TRUE.</para>
50 * Since 0.10.9, any #GstBaseSrc can enable pull based scheduling at any time
51 * by overriding #GstBaseSrcClass.check_get_range() so that it returns %TRUE.
53 * If all the conditions are met for operating in pull mode, #GstBaseSrc is
54 * automatically seekable in push mode as well. The following conditions must
55 * be met to make the element seekable in push mode when the format is not
59 * #GstBaseSrcClass.is_seekable() returns %TRUE.
62 * #GstBaseSrcClass.query() can convert all supported seek formats to the
63 * internal format as set with gst_base_src_set_format().
66 * #GstBaseSrcClass.do_seek() is implemented, performs the seek and returns
71 * When the element does not meet the requirements to operate in pull mode, the
72 * offset and length in the #GstBaseSrcClass.create() method should be ignored.
73 * It is recommended to subclass #GstPushSrc instead, in this situation. If the
74 * element can operate in pull mode but only with specific offsets and
75 * lengths, it is allowed to generate an error when the wrong values are passed
76 * to the #GstBaseSrcClass.create() function.
78 * #GstBaseSrc has support for live sources. Live sources are sources that when
79 * paused discard data, such as audio or video capture devices. A typical live
80 * source also produces data at a fixed rate and thus provides a clock to publish
82 * Use gst_base_src_set_live() to activate the live source mode.
84 * A live source does not produce data in the PAUSED state. This means that the
85 * #GstBaseSrcClass.create() method will not be called in PAUSED but only in
86 * PLAYING. To signal the pipeline that the element will not produce data, the
87 * return value from the READY to PAUSED state will be
88 * #GST_STATE_CHANGE_NO_PREROLL.
90 * A typical live source will timestamp the buffers it creates with the
91 * current running time of the pipeline. This is one reason why a live source
92 * can only produce data in the PLAYING state, when the clock is actually
93 * distributed and running.
95 * Live sources that synchronize and block on the clock (an audio source, for
96 * example) can since 0.10.12 use gst_base_src_wait_playing() when the
97 * #GstBaseSrcClass.create() function was interrupted by a state change to
100 * The #GstBaseSrcClass.get_times() method can be used to implement pseudo-live
101 * sources. It only makes sense to implement the #GstBaseSrcClass.get_times()
102 * function if the source is a live source. The #GstBaseSrcClass.get_times()
103 * function should return timestamps starting from 0, as if it were a non-live
104 * source. The base class will make sure that the timestamps are transformed
105 * into the current running_time. The base source will then wait for the
106 * calculated running_time before pushing out the buffer.
108 * For live sources, the base class will by default report a latency of 0.
109 * For pseudo live sources, the base class will by default measure the difference
110 * between the first buffer timestamp and the start time of get_times and will
111 * report this value as the latency.
112 * Subclasses should override the query function when this behaviour is not
115 * There is only support in #GstBaseSrc for exactly one source pad, which
116 * should be named "src". A source implementation (subclass of #GstBaseSrc)
117 * should install a pad template in its class_init function, like so:
120 * my_element_class_init (GstMyElementClass *klass)
122 * GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
123 * // srctemplate should be a #GstStaticPadTemplate with direction
124 * // #GST_PAD_SRC and name "src"
125 * gst_element_class_add_pad_template (gstelement_class,
126 * gst_static_pad_template_get (&srctemplate));
127 * // see #GstElementDetails
128 * gst_element_class_set_details (gstelement_class, &details);
133 * <title>Controlled shutdown of live sources in applications</title>
135 * Applications that record from a live source may want to stop recording
136 * in a controlled way, so that the recording is stopped, but the data
137 * already in the pipeline is processed to the end (remember that many live
138 * sources would go on recording forever otherwise). For that to happen the
139 * application needs to make the source stop recording and send an EOS
140 * event down the pipeline. The application would then wait for an
141 * EOS message posted on the pipeline's bus to know when all data has
142 * been processed and the pipeline can safely be stopped.
144 * Since GStreamer 0.10.16 an application may send an EOS event to a source
145 * element to make it perform the EOS logic (send EOS event downstream or post a
146 * #GST_MESSAGE_SEGMENT_DONE on the bus). This can typically be done
147 * with the gst_element_send_event() function on the element or its parent bin.
149 * After the EOS has been sent to the element, the application should wait for
150 * an EOS message to be posted on the pipeline's bus. Once this EOS message is
151 * received, it may safely shut down the entire pipeline.
153 * The old behaviour for controlled shutdown introduced since GStreamer 0.10.3
154 * is still available but deprecated as it is dangerous and less flexible.
156 * Last reviewed on 2007-12-19 (0.10.16)
168 #include <gst/gst_private.h>
170 #include "gstbasesrc.h"
171 #include "gsttypefindhelper.h"
172 #include <gst/gstmarshal.h>
173 #include <gst/gst-i18n-lib.h>
175 GST_DEBUG_CATEGORY_STATIC (gst_base_src_debug);
176 #define GST_CAT_DEFAULT gst_base_src_debug
178 #define GST_LIVE_GET_LOCK(elem) (GST_BASE_SRC_CAST(elem)->live_lock)
179 #define GST_LIVE_LOCK(elem) g_mutex_lock(GST_LIVE_GET_LOCK(elem))
180 #define GST_LIVE_TRYLOCK(elem) g_mutex_trylock(GST_LIVE_GET_LOCK(elem))
181 #define GST_LIVE_UNLOCK(elem) g_mutex_unlock(GST_LIVE_GET_LOCK(elem))
182 #define GST_LIVE_GET_COND(elem) (GST_BASE_SRC_CAST(elem)->live_cond)
183 #define GST_LIVE_WAIT(elem) g_cond_wait (GST_LIVE_GET_COND (elem), GST_LIVE_GET_LOCK (elem))
184 #define GST_LIVE_TIMED_WAIT(elem, timeval) g_cond_timed_wait (GST_LIVE_GET_COND (elem), GST_LIVE_GET_LOCK (elem),\
186 #define GST_LIVE_SIGNAL(elem) g_cond_signal (GST_LIVE_GET_COND (elem));
187 #define GST_LIVE_BROADCAST(elem) g_cond_broadcast (GST_LIVE_GET_COND (elem));
189 /* BaseSrc signals and args */
196 #define DEFAULT_BLOCKSIZE 4096
197 #define DEFAULT_NUM_BUFFERS -1
198 #define DEFAULT_TYPEFIND FALSE
199 #define DEFAULT_DO_TIMESTAMP FALSE
210 #define GST_BASE_SRC_GET_PRIVATE(obj) \
211 (G_TYPE_INSTANCE_GET_PRIVATE ((obj), GST_TYPE_BASE_SRC, GstBaseSrcPrivate))
213 struct _GstBaseSrcPrivate
215 gboolean last_sent_eos; /* last thing we did was send an EOS (we set this
216 * to avoid the sending of two EOS in some cases) */
220 /* two segments to be sent in the streaming thread with STREAM_LOCK */
221 GstEvent *close_segment;
222 GstEvent *start_segment;
223 gboolean newsegment_pending;
225 /* if EOS is pending (atomic) */
228 /* startup latency is the time it takes between going to PLAYING and producing
229 * the first BUFFER with running_time 0. This value is included in the latency
231 GstClockTime latency;
232 /* timestamp offset, this is the offset add to the values of gst_times for
233 * pseudo live sources */
234 GstClockTimeDiff ts_offset;
236 gboolean do_timestamp;
238 /* stream sequence number */
241 /* pending events (TAG, CUSTOM_BOTH, CUSTOM_DOWNSTREAM) to be
242 * pushed in the data stream */
243 GList *pending_events;
244 volatile gint have_events;
246 /* QoS *//* with LOCK */
247 gboolean qos_enabled;
249 GstClockTime earliest_time;
252 static GstElementClass *parent_class = NULL;
254 static void gst_base_src_base_init (gpointer g_class);
255 static void gst_base_src_class_init (GstBaseSrcClass * klass);
256 static void gst_base_src_init (GstBaseSrc * src, gpointer g_class);
257 static void gst_base_src_finalize (GObject * object);
261 gst_base_src_get_type (void)
263 static volatile gsize base_src_type = 0;
265 if (g_once_init_enter (&base_src_type)) {
267 static const GTypeInfo base_src_info = {
268 sizeof (GstBaseSrcClass),
269 (GBaseInitFunc) gst_base_src_base_init,
271 (GClassInitFunc) gst_base_src_class_init,
276 (GInstanceInitFunc) gst_base_src_init,
279 _type = g_type_register_static (GST_TYPE_ELEMENT,
280 "GstBaseSrc", &base_src_info, G_TYPE_FLAG_ABSTRACT);
281 g_once_init_leave (&base_src_type, _type);
283 return base_src_type;
286 static GstCaps *gst_base_src_getcaps (GstPad * pad);
287 static gboolean gst_base_src_setcaps (GstPad * pad, GstCaps * caps);
288 static void gst_base_src_fixate (GstPad * pad, GstCaps * caps);
290 static gboolean gst_base_src_activate_push (GstPad * pad, gboolean active);
291 static gboolean gst_base_src_activate_pull (GstPad * pad, gboolean active);
292 static void gst_base_src_set_property (GObject * object, guint prop_id,
293 const GValue * value, GParamSpec * pspec);
294 static void gst_base_src_get_property (GObject * object, guint prop_id,
295 GValue * value, GParamSpec * pspec);
296 static gboolean gst_base_src_event_handler (GstPad * pad, GstEvent * event);
297 static gboolean gst_base_src_send_event (GstElement * elem, GstEvent * event);
298 static gboolean gst_base_src_default_event (GstBaseSrc * src, GstEvent * event);
299 static const GstQueryType *gst_base_src_get_query_types (GstElement * element);
301 static gboolean gst_base_src_query (GstPad * pad, GstQuery * query);
303 static gboolean gst_base_src_default_negotiate (GstBaseSrc * basesrc);
304 static gboolean gst_base_src_default_do_seek (GstBaseSrc * src,
305 GstSegment * segment);
306 static gboolean gst_base_src_default_query (GstBaseSrc * src, GstQuery * query);
307 static gboolean gst_base_src_default_prepare_seek_segment (GstBaseSrc * src,
308 GstEvent * event, GstSegment * segment);
310 static gboolean gst_base_src_set_flushing (GstBaseSrc * basesrc,
311 gboolean flushing, gboolean live_play, gboolean unlock, gboolean * playing);
312 static gboolean gst_base_src_start (GstBaseSrc * basesrc);
313 static gboolean gst_base_src_stop (GstBaseSrc * basesrc);
315 static GstStateChangeReturn gst_base_src_change_state (GstElement * element,
316 GstStateChange transition);
318 static void gst_base_src_loop (GstPad * pad);
319 static gboolean gst_base_src_pad_check_get_range (GstPad * pad);
320 static gboolean gst_base_src_default_check_get_range (GstBaseSrc * bsrc);
321 static GstFlowReturn gst_base_src_pad_get_range (GstPad * pad, guint64 offset,
322 guint length, GstBuffer ** buf);
323 static GstFlowReturn gst_base_src_get_range (GstBaseSrc * src, guint64 offset,
324 guint length, GstBuffer ** buf);
325 static gboolean gst_base_src_seekable (GstBaseSrc * src);
328 gst_base_src_base_init (gpointer g_class)
330 GST_DEBUG_CATEGORY_INIT (gst_base_src_debug, "basesrc", 0, "basesrc element");
334 gst_base_src_class_init (GstBaseSrcClass * klass)
336 GObjectClass *gobject_class;
337 GstElementClass *gstelement_class;
339 gobject_class = G_OBJECT_CLASS (klass);
340 gstelement_class = GST_ELEMENT_CLASS (klass);
342 g_type_class_add_private (klass, sizeof (GstBaseSrcPrivate));
344 parent_class = g_type_class_peek_parent (klass);
346 gobject_class->finalize = gst_base_src_finalize;
347 gobject_class->set_property = gst_base_src_set_property;
348 gobject_class->get_property = gst_base_src_get_property;
350 /* FIXME 0.11: blocksize property should be int, not ulong (min is >max here) */
351 g_object_class_install_property (gobject_class, PROP_BLOCKSIZE,
352 g_param_spec_ulong ("blocksize", "Block size",
353 "Size in bytes to read per buffer (-1 = default)", 0, G_MAXULONG,
354 DEFAULT_BLOCKSIZE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
355 g_object_class_install_property (gobject_class, PROP_NUM_BUFFERS,
356 g_param_spec_int ("num-buffers", "num-buffers",
357 "Number of buffers to output before sending EOS (-1 = unlimited)",
358 -1, G_MAXINT, DEFAULT_NUM_BUFFERS, G_PARAM_READWRITE |
359 G_PARAM_STATIC_STRINGS));
360 g_object_class_install_property (gobject_class, PROP_TYPEFIND,
361 g_param_spec_boolean ("typefind", "Typefind",
362 "Run typefind before negotiating", DEFAULT_TYPEFIND,
363 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
364 g_object_class_install_property (gobject_class, PROP_DO_TIMESTAMP,
365 g_param_spec_boolean ("do-timestamp", "Do timestamp",
366 "Apply current stream time to buffers", DEFAULT_DO_TIMESTAMP,
367 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
369 gstelement_class->change_state =
370 GST_DEBUG_FUNCPTR (gst_base_src_change_state);
371 gstelement_class->send_event = GST_DEBUG_FUNCPTR (gst_base_src_send_event);
372 gstelement_class->get_query_types =
373 GST_DEBUG_FUNCPTR (gst_base_src_get_query_types);
375 klass->negotiate = GST_DEBUG_FUNCPTR (gst_base_src_default_negotiate);
376 klass->event = GST_DEBUG_FUNCPTR (gst_base_src_default_event);
377 klass->do_seek = GST_DEBUG_FUNCPTR (gst_base_src_default_do_seek);
378 klass->query = GST_DEBUG_FUNCPTR (gst_base_src_default_query);
379 klass->check_get_range =
380 GST_DEBUG_FUNCPTR (gst_base_src_default_check_get_range);
381 klass->prepare_seek_segment =
382 GST_DEBUG_FUNCPTR (gst_base_src_default_prepare_seek_segment);
384 /* Registering debug symbols for function pointers */
385 GST_DEBUG_REGISTER_FUNCPTR (gst_base_src_activate_push);
386 GST_DEBUG_REGISTER_FUNCPTR (gst_base_src_activate_pull);
387 GST_DEBUG_REGISTER_FUNCPTR (gst_base_src_event_handler);
388 GST_DEBUG_REGISTER_FUNCPTR (gst_base_src_query);
389 GST_DEBUG_REGISTER_FUNCPTR (gst_base_src_pad_get_range);
390 GST_DEBUG_REGISTER_FUNCPTR (gst_base_src_pad_check_get_range);
391 GST_DEBUG_REGISTER_FUNCPTR (gst_base_src_getcaps);
392 GST_DEBUG_REGISTER_FUNCPTR (gst_base_src_setcaps);
393 GST_DEBUG_REGISTER_FUNCPTR (gst_base_src_fixate);
397 gst_base_src_init (GstBaseSrc * basesrc, gpointer g_class)
400 GstPadTemplate *pad_template;
402 basesrc->priv = GST_BASE_SRC_GET_PRIVATE (basesrc);
404 basesrc->is_live = FALSE;
405 basesrc->live_lock = g_mutex_new ();
406 basesrc->live_cond = g_cond_new ();
407 basesrc->num_buffers = DEFAULT_NUM_BUFFERS;
408 basesrc->num_buffers_left = -1;
410 basesrc->can_activate_push = TRUE;
411 basesrc->pad_mode = GST_ACTIVATE_NONE;
414 gst_element_class_get_pad_template (GST_ELEMENT_CLASS (g_class), "src");
415 g_return_if_fail (pad_template != NULL);
417 GST_DEBUG_OBJECT (basesrc, "creating src pad");
418 pad = gst_pad_new_from_template (pad_template, "src");
420 GST_DEBUG_OBJECT (basesrc, "setting functions on src pad");
421 gst_pad_set_activatepush_function (pad, gst_base_src_activate_push);
422 gst_pad_set_activatepull_function (pad, gst_base_src_activate_pull);
423 gst_pad_set_event_function (pad, gst_base_src_event_handler);
424 gst_pad_set_query_function (pad, gst_base_src_query);
425 gst_pad_set_checkgetrange_function (pad, gst_base_src_pad_check_get_range);
426 gst_pad_set_getrange_function (pad, gst_base_src_pad_get_range);
427 gst_pad_set_getcaps_function (pad, gst_base_src_getcaps);
428 gst_pad_set_setcaps_function (pad, gst_base_src_setcaps);
429 gst_pad_set_fixatecaps_function (pad, gst_base_src_fixate);
431 /* hold pointer to pad */
432 basesrc->srcpad = pad;
433 GST_DEBUG_OBJECT (basesrc, "adding src pad");
434 gst_element_add_pad (GST_ELEMENT (basesrc), pad);
436 basesrc->blocksize = DEFAULT_BLOCKSIZE;
437 basesrc->clock_id = NULL;
438 /* we operate in BYTES by default */
439 gst_base_src_set_format (basesrc, GST_FORMAT_BYTES);
440 basesrc->data.ABI.typefind = DEFAULT_TYPEFIND;
441 basesrc->priv->do_timestamp = DEFAULT_DO_TIMESTAMP;
442 g_atomic_int_set (&basesrc->priv->have_events, FALSE);
444 GST_OBJECT_FLAG_UNSET (basesrc, GST_BASE_SRC_STARTED);
445 GST_OBJECT_FLAG_SET (basesrc, GST_ELEMENT_IS_SOURCE);
447 GST_DEBUG_OBJECT (basesrc, "init done");
451 gst_base_src_finalize (GObject * object)
456 basesrc = GST_BASE_SRC (object);
458 g_mutex_free (basesrc->live_lock);
459 g_cond_free (basesrc->live_cond);
461 event_p = &basesrc->data.ABI.pending_seek;
462 gst_event_replace (event_p, NULL);
464 if (basesrc->priv->pending_events) {
465 g_list_foreach (basesrc->priv->pending_events, (GFunc) gst_event_unref,
467 g_list_free (basesrc->priv->pending_events);
470 G_OBJECT_CLASS (parent_class)->finalize (object);
474 * gst_base_src_wait_playing:
477 * If the #GstBaseSrcClass.create() method performs its own synchronisation
478 * against the clock it must unblock when going from PLAYING to the PAUSED state
479 * and call this method before continuing to produce the remaining data.
481 * This function will block until a state change to PLAYING happens (in which
482 * case this function returns #GST_FLOW_OK) or the processing must be stopped due
483 * to a state change to READY or a FLUSH event (in which case this function
484 * returns #GST_FLOW_WRONG_STATE).
488 * Returns: #GST_FLOW_OK if @src is PLAYING and processing can
489 * continue. Any other return value should be returned from the create vmethod.
492 gst_base_src_wait_playing (GstBaseSrc * src)
494 g_return_val_if_fail (GST_IS_BASE_SRC (src), GST_FLOW_ERROR);
497 /* block until the state changes, or we get a flush, or something */
498 GST_DEBUG_OBJECT (src, "live source waiting for running state");
500 GST_DEBUG_OBJECT (src, "live source unlocked");
501 if (src->priv->flushing)
503 } while (G_UNLIKELY (!src->live_running));
510 GST_DEBUG_OBJECT (src, "we are flushing");
511 return GST_FLOW_WRONG_STATE;
516 * gst_base_src_set_live:
517 * @src: base source instance
518 * @live: new live-mode
520 * If the element listens to a live source, @live should
523 * A live source will not produce data in the PAUSED state and
524 * will therefore not be able to participate in the PREROLL phase
525 * of a pipeline. To signal this fact to the application and the
526 * pipeline, the state change return value of the live source will
527 * be GST_STATE_CHANGE_NO_PREROLL.
530 gst_base_src_set_live (GstBaseSrc * src, gboolean live)
532 g_return_if_fail (GST_IS_BASE_SRC (src));
534 GST_OBJECT_LOCK (src);
536 GST_OBJECT_UNLOCK (src);
540 * gst_base_src_is_live:
541 * @src: base source instance
543 * Check if an element is in live mode.
545 * Returns: %TRUE if element is in live mode.
548 gst_base_src_is_live (GstBaseSrc * src)
552 g_return_val_if_fail (GST_IS_BASE_SRC (src), FALSE);
554 GST_OBJECT_LOCK (src);
555 result = src->is_live;
556 GST_OBJECT_UNLOCK (src);
562 * gst_base_src_set_format:
563 * @src: base source instance
564 * @format: the format to use
566 * Sets the default format of the source. This will be the format used
567 * for sending NEW_SEGMENT events and for performing seeks.
569 * If a format of GST_FORMAT_BYTES is set, the element will be able to
570 * operate in pull mode if the #GstBaseSrcClass.is_seekable() returns TRUE.
572 * This function must only be called in states < %GST_STATE_PAUSED.
577 gst_base_src_set_format (GstBaseSrc * src, GstFormat format)
579 g_return_if_fail (GST_IS_BASE_SRC (src));
580 g_return_if_fail (GST_STATE (src) <= GST_STATE_READY);
582 GST_OBJECT_LOCK (src);
583 gst_segment_init (&src->segment, format);
584 GST_OBJECT_UNLOCK (src);
588 * gst_base_src_query_latency:
590 * @live: (out) (allow-none): if the source is live
591 * @min_latency: (out) (allow-none): the min latency of the source
592 * @max_latency: (out) (allow-none): the max latency of the source
594 * Query the source for the latency parameters. @live will be TRUE when @src is
595 * configured as a live source. @min_latency will be set to the difference
596 * between the running time and the timestamp of the first buffer.
597 * @max_latency is always the undefined value of -1.
599 * This function is mostly used by subclasses.
601 * Returns: TRUE if the query succeeded.
606 gst_base_src_query_latency (GstBaseSrc * src, gboolean * live,
607 GstClockTime * min_latency, GstClockTime * max_latency)
611 g_return_val_if_fail (GST_IS_BASE_SRC (src), FALSE);
613 GST_OBJECT_LOCK (src);
615 *live = src->is_live;
617 /* if we have a startup latency, report this one, else report 0. Subclasses
618 * are supposed to override the query function if they want something
620 if (src->priv->latency != -1)
621 min = src->priv->latency;
630 GST_LOG_OBJECT (src, "latency: live %d, min %" GST_TIME_FORMAT
631 ", max %" GST_TIME_FORMAT, src->is_live, GST_TIME_ARGS (min),
633 GST_OBJECT_UNLOCK (src);
639 * gst_base_src_set_blocksize:
641 * @blocksize: the new blocksize in bytes
643 * Set the number of bytes that @src will push out with each buffer. When
644 * @blocksize is set to -1, a default length will be used.
648 /* FIXME 0.11: blocksize property should be int, not ulong */
650 gst_base_src_set_blocksize (GstBaseSrc * src, gulong blocksize)
652 g_return_if_fail (GST_IS_BASE_SRC (src));
654 GST_OBJECT_LOCK (src);
655 src->blocksize = blocksize;
656 GST_OBJECT_UNLOCK (src);
660 * gst_base_src_get_blocksize:
663 * Get the number of bytes that @src will push out with each buffer.
665 * Returns: the number of bytes pushed with each buffer.
669 /* FIXME 0.11: blocksize property should be int, not ulong */
671 gst_base_src_get_blocksize (GstBaseSrc * src)
675 g_return_val_if_fail (GST_IS_BASE_SRC (src), 0);
677 GST_OBJECT_LOCK (src);
678 res = src->blocksize;
679 GST_OBJECT_UNLOCK (src);
686 * gst_base_src_set_do_timestamp:
688 * @timestamp: enable or disable timestamping
690 * Configure @src to automatically timestamp outgoing buffers based on the
691 * current running_time of the pipeline. This property is mostly useful for live
697 gst_base_src_set_do_timestamp (GstBaseSrc * src, gboolean timestamp)
699 g_return_if_fail (GST_IS_BASE_SRC (src));
701 GST_OBJECT_LOCK (src);
702 src->priv->do_timestamp = timestamp;
703 GST_OBJECT_UNLOCK (src);
707 * gst_base_src_get_do_timestamp:
710 * Query if @src timestamps outgoing buffers based on the current running_time.
712 * Returns: %TRUE if the base class will automatically timestamp outgoing buffers.
717 gst_base_src_get_do_timestamp (GstBaseSrc * src)
721 g_return_val_if_fail (GST_IS_BASE_SRC (src), FALSE);
723 GST_OBJECT_LOCK (src);
724 res = src->priv->do_timestamp;
725 GST_OBJECT_UNLOCK (src);
731 * gst_base_src_new_seamless_segment:
733 * @start: The new start value for the segment
734 * @stop: Stop value for the new segment
735 * @position: The position value for the new segent
737 * Prepare a new seamless segment for emission downstream. This function must
738 * only be called by derived sub-classes, and only from the create() function,
739 * as the stream-lock needs to be held.
741 * The format for the new segment will be the current format of the source, as
742 * configured with gst_base_src_set_format()
744 * Returns: %TRUE if preparation of the seamless segment succeeded.
749 gst_base_src_new_seamless_segment (GstBaseSrc * src, gint64 start, gint64 stop,
754 GST_DEBUG_OBJECT (src,
755 "Starting new seamless segment. Start %" GST_TIME_FORMAT " stop %"
756 GST_TIME_FORMAT " position %" GST_TIME_FORMAT, GST_TIME_ARGS (start),
757 GST_TIME_ARGS (stop), GST_TIME_ARGS (position));
759 GST_OBJECT_LOCK (src);
760 if (src->data.ABI.running && !src->priv->newsegment_pending) {
761 if (src->priv->close_segment)
762 gst_event_unref (src->priv->close_segment);
763 src->priv->close_segment =
764 gst_event_new_new_segment_full (TRUE,
765 src->segment.rate, src->segment.applied_rate, src->segment.format,
766 src->segment.start, src->segment.last_stop, src->segment.time);
769 gst_segment_set_newsegment_full (&src->segment, FALSE, src->segment.rate,
770 src->segment.applied_rate, src->segment.format, start, stop, position);
772 if (src->priv->start_segment)
773 gst_event_unref (src->priv->start_segment);
774 if (src->segment.rate >= 0.0) {
775 /* forward, we send data from last_stop to stop */
776 src->priv->start_segment =
777 gst_event_new_new_segment_full (FALSE,
778 src->segment.rate, src->segment.applied_rate, src->segment.format,
779 src->segment.last_stop, stop, src->segment.time);
781 /* reverse, we send data from last_stop to start */
782 src->priv->start_segment =
783 gst_event_new_new_segment_full (FALSE,
784 src->segment.rate, src->segment.applied_rate, src->segment.format,
785 src->segment.start, src->segment.last_stop, src->segment.time);
787 GST_OBJECT_UNLOCK (src);
789 src->priv->discont = TRUE;
790 src->data.ABI.running = TRUE;
796 gst_base_src_setcaps (GstPad * pad, GstCaps * caps)
798 GstBaseSrcClass *bclass;
802 bsrc = GST_BASE_SRC (GST_PAD_PARENT (pad));
803 bclass = GST_BASE_SRC_GET_CLASS (bsrc);
805 if (bclass->set_caps)
806 res = bclass->set_caps (bsrc, caps);
812 gst_base_src_getcaps (GstPad * pad)
814 GstBaseSrcClass *bclass;
816 GstCaps *caps = NULL;
818 bsrc = GST_BASE_SRC (GST_PAD_PARENT (pad));
819 bclass = GST_BASE_SRC_GET_CLASS (bsrc);
820 if (bclass->get_caps)
821 caps = bclass->get_caps (bsrc);
824 GstPadTemplate *pad_template;
827 gst_element_class_get_pad_template (GST_ELEMENT_CLASS (bclass), "src");
828 if (pad_template != NULL) {
829 caps = gst_caps_ref (gst_pad_template_get_caps (pad_template));
836 gst_base_src_fixate (GstPad * pad, GstCaps * caps)
838 GstBaseSrcClass *bclass;
841 bsrc = GST_BASE_SRC (gst_pad_get_parent (pad));
842 bclass = GST_BASE_SRC_GET_CLASS (bsrc);
845 bclass->fixate (bsrc, caps);
847 gst_object_unref (bsrc);
851 gst_base_src_default_query (GstBaseSrc * src, GstQuery * query)
855 switch (GST_QUERY_TYPE (query)) {
856 case GST_QUERY_POSITION:
860 gst_query_parse_position (query, &format, NULL);
862 GST_DEBUG_OBJECT (src, "position query in format %s",
863 gst_format_get_name (format));
866 case GST_FORMAT_PERCENT:
872 GST_OBJECT_LOCK (src);
873 position = src->segment.last_stop;
874 duration = src->segment.duration;
875 GST_OBJECT_UNLOCK (src);
877 if (position != -1 && duration != -1) {
878 if (position < duration)
879 percent = gst_util_uint64_scale (GST_FORMAT_PERCENT_MAX, position,
882 percent = GST_FORMAT_PERCENT_MAX;
886 gst_query_set_position (query, GST_FORMAT_PERCENT, percent);
893 GstFormat seg_format;
895 GST_OBJECT_LOCK (src);
897 gst_segment_to_stream_time (&src->segment, src->segment.format,
898 src->segment.last_stop);
899 seg_format = src->segment.format;
900 GST_OBJECT_UNLOCK (src);
902 if (position != -1) {
903 /* convert to requested format */
905 gst_pad_query_convert (src->srcpad, seg_format,
906 position, &format, &position);
910 gst_query_set_position (query, format, position);
916 case GST_QUERY_DURATION:
920 gst_query_parse_duration (query, &format, NULL);
922 GST_DEBUG_OBJECT (src, "duration query in format %s",
923 gst_format_get_name (format));
926 case GST_FORMAT_PERCENT:
927 gst_query_set_duration (query, GST_FORMAT_PERCENT,
928 GST_FORMAT_PERCENT_MAX);
934 GstFormat seg_format;
936 GST_OBJECT_LOCK (src);
937 /* this is the duration as configured by the subclass. */
938 duration = src->segment.duration;
939 seg_format = src->segment.format;
940 GST_OBJECT_UNLOCK (src);
942 GST_LOG_OBJECT (src, "duration %" G_GINT64_FORMAT ", format %s",
943 duration, gst_format_get_name (seg_format));
945 if (duration != -1) {
946 /* convert to requested format, if this fails, we have a duration
947 * but we cannot answer the query, we must return FALSE. */
949 gst_pad_query_convert (src->srcpad, seg_format,
950 duration, &format, &duration);
952 /* The subclass did not configure a duration, we assume that the
953 * media has an unknown duration then and we return TRUE to report
954 * this. Note that this is not the same as returning FALSE, which
955 * means that we cannot report the duration at all. */
958 gst_query_set_duration (query, format, duration);
965 case GST_QUERY_SEEKING:
967 GstFormat format, seg_format;
970 GST_OBJECT_LOCK (src);
971 duration = src->segment.duration;
972 seg_format = src->segment.format;
973 GST_OBJECT_UNLOCK (src);
975 gst_query_parse_seeking (query, &format, NULL, NULL, NULL);
976 if (format == seg_format) {
977 gst_query_set_seeking (query, seg_format,
978 gst_base_src_seekable (src), 0, duration);
981 /* FIXME 0.11: return TRUE + seekable=FALSE for SEEKING query here */
982 /* Don't reply to the query to make up for demuxers which don't
983 * handle the SEEKING query yet. Players like Totem will fall back
984 * to the duration when the SEEKING query isn't answered. */
989 case GST_QUERY_SEGMENT:
993 GST_OBJECT_LOCK (src);
994 /* no end segment configured, current duration then */
995 if ((stop = src->segment.stop) == -1)
996 stop = src->segment.duration;
997 start = src->segment.start;
999 /* adjust to stream time */
1000 if (src->segment.time != -1) {
1001 start -= src->segment.time;
1003 stop -= src->segment.time;
1006 gst_query_set_segment (query, src->segment.rate, src->segment.format,
1008 GST_OBJECT_UNLOCK (src);
1013 case GST_QUERY_FORMATS:
1015 gst_query_set_formats (query, 3, GST_FORMAT_DEFAULT,
1016 GST_FORMAT_BYTES, GST_FORMAT_PERCENT);
1020 case GST_QUERY_CONVERT:
1022 GstFormat src_fmt, dest_fmt;
1023 gint64 src_val, dest_val;
1025 gst_query_parse_convert (query, &src_fmt, &src_val, &dest_fmt, &dest_val);
1027 /* we can only convert between equal formats... */
1028 if (src_fmt == dest_fmt) {
1034 gst_query_set_convert (query, src_fmt, src_val, dest_fmt, dest_val);
1037 case GST_QUERY_LATENCY:
1039 GstClockTime min, max;
1042 /* Subclasses should override and implement something usefull */
1043 res = gst_base_src_query_latency (src, &live, &min, &max);
1045 GST_LOG_OBJECT (src, "report latency: live %d, min %" GST_TIME_FORMAT
1046 ", max %" GST_TIME_FORMAT, live, GST_TIME_ARGS (min),
1047 GST_TIME_ARGS (max));
1049 gst_query_set_latency (query, live, min, max);
1052 case GST_QUERY_JITTER:
1053 case GST_QUERY_RATE:
1056 case GST_QUERY_BUFFERING:
1058 GstFormat format, seg_format;
1059 gint64 start, stop, estimated;
1061 gst_query_parse_buffering_range (query, &format, NULL, NULL, NULL);
1063 GST_DEBUG_OBJECT (src, "buffering query in format %s",
1064 gst_format_get_name (format));
1066 GST_OBJECT_LOCK (src);
1067 if (src->random_access) {
1070 if (format == GST_FORMAT_PERCENT)
1071 stop = GST_FORMAT_PERCENT_MAX;
1073 stop = src->segment.duration;
1079 seg_format = src->segment.format;
1080 GST_OBJECT_UNLOCK (src);
1082 /* convert to required format. When the conversion fails, we can't answer
1083 * the query. When the value is unknown, we can don't perform conversion
1084 * but report TRUE. */
1085 if (format != GST_FORMAT_PERCENT && stop != -1) {
1086 res = gst_pad_query_convert (src->srcpad, seg_format,
1087 stop, &format, &stop);
1091 if (res && format != GST_FORMAT_PERCENT && start != -1)
1092 res = gst_pad_query_convert (src->srcpad, seg_format,
1093 start, &format, &start);
1095 gst_query_set_buffering_range (query, format, start, stop, estimated);
1102 GST_DEBUG_OBJECT (src, "query %s returns %d", GST_QUERY_TYPE_NAME (query),
1108 gst_base_src_query (GstPad * pad, GstQuery * query)
1111 GstBaseSrcClass *bclass;
1112 gboolean result = FALSE;
1114 src = GST_BASE_SRC (gst_pad_get_parent (pad));
1115 if (G_UNLIKELY (src == NULL))
1118 bclass = GST_BASE_SRC_GET_CLASS (src);
1121 result = bclass->query (src, query);
1123 result = gst_pad_query_default (pad, query);
1125 gst_object_unref (src);
1131 gst_base_src_default_do_seek (GstBaseSrc * src, GstSegment * segment)
1133 gboolean res = TRUE;
1135 /* update our offset if the start/stop position was updated */
1136 if (segment->format == GST_FORMAT_BYTES) {
1137 segment->time = segment->start;
1138 } else if (segment->start == 0) {
1139 /* seek to start, we can implement a default for this. */
1143 GST_INFO_OBJECT (src, "Can't do a default seek");
1150 gst_base_src_do_seek (GstBaseSrc * src, GstSegment * segment)
1152 GstBaseSrcClass *bclass;
1153 gboolean result = FALSE;
1155 bclass = GST_BASE_SRC_GET_CLASS (src);
1157 if (bclass->do_seek)
1158 result = bclass->do_seek (src, segment);
1163 #define SEEK_TYPE_IS_RELATIVE(t) (((t) != GST_SEEK_TYPE_NONE) && ((t) != GST_SEEK_TYPE_SET))
1166 gst_base_src_default_prepare_seek_segment (GstBaseSrc * src, GstEvent * event,
1167 GstSegment * segment)
1169 /* By default, we try one of 2 things:
1170 * - For absolute seek positions, convert the requested position to our
1171 * configured processing format and place it in the output segment \
1172 * - For relative seek positions, convert our current (input) values to the
1173 * seek format, adjust by the relative seek offset and then convert back to
1174 * the processing format
1176 GstSeekType cur_type, stop_type;
1179 GstFormat seek_format, dest_format;
1182 gboolean res = TRUE;
1184 gst_event_parse_seek (event, &rate, &seek_format, &flags,
1185 &cur_type, &cur, &stop_type, &stop);
1186 dest_format = segment->format;
1188 if (seek_format == dest_format) {
1189 gst_segment_set_seek (segment, rate, seek_format, flags,
1190 cur_type, cur, stop_type, stop, &update);
1194 if (cur_type != GST_SEEK_TYPE_NONE) {
1195 /* FIXME: Handle seek_cur & seek_end by converting the input segment vals */
1197 gst_pad_query_convert (src->srcpad, seek_format, cur, &dest_format,
1199 cur_type = GST_SEEK_TYPE_SET;
1202 if (res && stop_type != GST_SEEK_TYPE_NONE) {
1203 /* FIXME: Handle seek_cur & seek_end by converting the input segment vals */
1205 gst_pad_query_convert (src->srcpad, seek_format, stop, &dest_format,
1207 stop_type = GST_SEEK_TYPE_SET;
1210 /* And finally, configure our output segment in the desired format */
1211 gst_segment_set_seek (segment, rate, dest_format, flags, cur_type, cur,
1212 stop_type, stop, &update);
1221 GST_DEBUG_OBJECT (src, "undefined format given, seek aborted.");
1227 gst_base_src_prepare_seek_segment (GstBaseSrc * src, GstEvent * event,
1228 GstSegment * seeksegment)
1230 GstBaseSrcClass *bclass;
1231 gboolean result = FALSE;
1233 bclass = GST_BASE_SRC_GET_CLASS (src);
1235 if (bclass->prepare_seek_segment)
1236 result = bclass->prepare_seek_segment (src, event, seeksegment);
1241 /* this code implements the seeking. It is a good example
1242 * handling all cases.
1244 * A seek updates the currently configured segment.start
1245 * and segment.stop values based on the SEEK_TYPE. If the
1246 * segment.start value is updated, a seek to this new position
1247 * should be performed.
1249 * The seek can only be executed when we are not currently
1250 * streaming any data, to make sure that this is the case, we
1251 * acquire the STREAM_LOCK which is taken when we are in the
1252 * _loop() function or when a getrange() is called. Normally
1253 * we will not receive a seek if we are operating in pull mode
1254 * though. When we operate as a live source we might block on the live
1255 * cond, which does not release the STREAM_LOCK. Therefore we will try
1256 * to grab the LIVE_LOCK instead of the STREAM_LOCK to make sure it is
1257 * safe to perform the seek.
1259 * When we are in the loop() function, we might be in the middle
1260 * of pushing a buffer, which might block in a sink. To make sure
1261 * that the push gets unblocked we push out a FLUSH_START event.
1262 * Our loop function will get a WRONG_STATE return value from
1263 * the push and will pause, effectively releasing the STREAM_LOCK.
1265 * For a non-flushing seek, we pause the task, which might eventually
1266 * release the STREAM_LOCK. We say eventually because when the sink
1267 * blocks on the sample we might wait a very long time until the sink
1268 * unblocks the sample. In any case we acquire the STREAM_LOCK and
1269 * can continue the seek. A non-flushing seek is normally done in a
1270 * running pipeline to perform seamless playback, this means that the sink is
1271 * PLAYING and will return from its chain function.
1272 * In the case of a non-flushing seek we need to make sure that the
1273 * data we output after the seek is continuous with the previous data,
1274 * this is because a non-flushing seek does not reset the running-time
1275 * to 0. We do this by closing the currently running segment, ie. sending
1276 * a new_segment event with the stop position set to the last processed
1279 * After updating the segment.start/stop values, we prepare for
1280 * streaming again. We push out a FLUSH_STOP to make the peer pad
1281 * accept data again and we start our task again.
1283 * A segment seek posts a message on the bus saying that the playback
1284 * of the segment started. We store the segment flag internally because
1285 * when we reach the segment.stop we have to post a segment.done
1286 * instead of EOS when doing a segment seek.
1288 /* FIXME (0.11), we have the unlock gboolean here because most current
1289 * implementations (fdsrc, -base/gst/tcp/, ...) unconditionally unlock, even when
1290 * the streaming thread isn't running, resulting in bogus unlocks later when it
1291 * starts. This is fixed by adding unlock_stop, but we should still avoid unlocking
1292 * unnecessarily for backwards compatibility. Ergo, the unlock variable stays
1296 gst_base_src_perform_seek (GstBaseSrc * src, GstEvent * event, gboolean unlock)
1298 gboolean res = TRUE, tres;
1300 GstFormat seek_format, dest_format;
1302 GstSeekType cur_type, stop_type;
1304 gboolean flush, playing;
1306 gboolean relative_seek = FALSE;
1307 gboolean seekseg_configured = FALSE;
1308 GstSegment seeksegment;
1312 GST_DEBUG_OBJECT (src, "doing seek: %" GST_PTR_FORMAT, event);
1314 GST_OBJECT_LOCK (src);
1315 dest_format = src->segment.format;
1316 GST_OBJECT_UNLOCK (src);
1319 gst_event_parse_seek (event, &rate, &seek_format, &flags,
1320 &cur_type, &cur, &stop_type, &stop);
1322 relative_seek = SEEK_TYPE_IS_RELATIVE (cur_type) ||
1323 SEEK_TYPE_IS_RELATIVE (stop_type);
1325 if (dest_format != seek_format && !relative_seek) {
1326 /* If we have an ABSOLUTE position (SEEK_SET only), we can convert it
1327 * here before taking the stream lock, otherwise we must convert it later,
1328 * once we have the stream lock and can read the last configures segment
1329 * start and stop positions */
1330 gst_segment_init (&seeksegment, dest_format);
1332 if (!gst_base_src_prepare_seek_segment (src, event, &seeksegment))
1333 goto prepare_failed;
1335 seekseg_configured = TRUE;
1338 flush = flags & GST_SEEK_FLAG_FLUSH;
1339 seqnum = gst_event_get_seqnum (event);
1342 /* get next seqnum */
1343 seqnum = gst_util_seqnum_next ();
1346 /* send flush start */
1348 tevent = gst_event_new_flush_start ();
1349 gst_event_set_seqnum (tevent, seqnum);
1350 gst_pad_push_event (src->srcpad, tevent);
1352 gst_pad_pause_task (src->srcpad);
1354 /* unblock streaming thread. */
1355 gst_base_src_set_flushing (src, TRUE, FALSE, unlock, &playing);
1357 /* grab streaming lock, this should eventually be possible, either
1358 * because the task is paused, our streaming thread stopped
1359 * or because our peer is flushing. */
1360 GST_PAD_STREAM_LOCK (src->srcpad);
1361 if (G_UNLIKELY (src->priv->seqnum == seqnum)) {
1362 /* we have seen this event before, issue a warning for now */
1363 GST_WARNING_OBJECT (src, "duplicate event found %" G_GUINT32_FORMAT,
1366 src->priv->seqnum = seqnum;
1367 GST_DEBUG_OBJECT (src, "seek with seqnum %" G_GUINT32_FORMAT, seqnum);
1370 gst_base_src_set_flushing (src, FALSE, playing, unlock, NULL);
1372 /* If we configured the seeksegment above, don't overwrite it now. Otherwise
1373 * copy the current segment info into the temp segment that we can actually
1374 * attempt the seek with. We only update the real segment if the seek suceeds. */
1375 if (!seekseg_configured) {
1376 memcpy (&seeksegment, &src->segment, sizeof (GstSegment));
1378 /* now configure the final seek segment */
1380 if (seeksegment.format != seek_format) {
1381 /* OK, here's where we give the subclass a chance to convert the relative
1382 * seek into an absolute one in the processing format. We set up any
1383 * absolute seek above, before taking the stream lock. */
1384 if (!gst_base_src_prepare_seek_segment (src, event, &seeksegment)) {
1385 GST_DEBUG_OBJECT (src, "Preparing the seek failed after flushing. "
1390 /* The seek format matches our processing format, no need to ask the
1391 * the subclass to configure the segment. */
1392 gst_segment_set_seek (&seeksegment, rate, seek_format, flags,
1393 cur_type, cur, stop_type, stop, &update);
1396 /* Else, no seek event passed, so we're just (re)starting the
1401 GST_DEBUG_OBJECT (src, "segment configured from %" G_GINT64_FORMAT
1402 " to %" G_GINT64_FORMAT ", position %" G_GINT64_FORMAT,
1403 seeksegment.start, seeksegment.stop, seeksegment.last_stop);
1405 /* do the seek, segment.last_stop contains the new position. */
1406 res = gst_base_src_do_seek (src, &seeksegment);
1409 /* and prepare to continue streaming */
1411 tevent = gst_event_new_flush_stop ();
1412 gst_event_set_seqnum (tevent, seqnum);
1413 /* send flush stop, peer will accept data and events again. We
1414 * are not yet providing data as we still have the STREAM_LOCK. */
1415 gst_pad_push_event (src->srcpad, tevent);
1416 } else if (res && src->data.ABI.running) {
1417 /* we are running the current segment and doing a non-flushing seek,
1418 * close the segment first based on the last_stop. */
1419 GST_DEBUG_OBJECT (src, "closing running segment %" G_GINT64_FORMAT
1420 " to %" G_GINT64_FORMAT, src->segment.start, src->segment.last_stop);
1422 /* queue the segment for sending in the stream thread */
1423 if (src->priv->close_segment)
1424 gst_event_unref (src->priv->close_segment);
1425 src->priv->close_segment =
1426 gst_event_new_new_segment_full (TRUE,
1427 src->segment.rate, src->segment.applied_rate, src->segment.format,
1428 src->segment.start, src->segment.last_stop, src->segment.time);
1429 gst_event_set_seqnum (src->priv->close_segment, seqnum);
1432 /* The subclass must have converted the segment to the processing format
1434 if (res && seeksegment.format != dest_format) {
1435 GST_DEBUG_OBJECT (src, "Subclass failed to prepare a seek segment "
1436 "in the correct format. Aborting seek.");
1440 /* if the seek was successful, we update our real segment and push
1441 * out the new segment. */
1443 GST_OBJECT_LOCK (src);
1444 memcpy (&src->segment, &seeksegment, sizeof (GstSegment));
1445 GST_OBJECT_UNLOCK (src);
1447 if (seeksegment.flags & GST_SEEK_FLAG_SEGMENT) {
1448 GstMessage *message;
1450 message = gst_message_new_segment_start (GST_OBJECT (src),
1451 seeksegment.format, seeksegment.last_stop);
1452 gst_message_set_seqnum (message, seqnum);
1454 gst_element_post_message (GST_ELEMENT (src), message);
1457 /* for deriving a stop position for the playback segment from the seek
1458 * segment, we must take the duration when the stop is not set */
1459 if ((stop = seeksegment.stop) == -1)
1460 stop = seeksegment.duration;
1462 GST_DEBUG_OBJECT (src, "Sending newsegment from %" G_GINT64_FORMAT
1463 " to %" G_GINT64_FORMAT, seeksegment.start, stop);
1465 /* now replace the old segment so that we send it in the stream thread the
1466 * next time it is scheduled. */
1467 if (src->priv->start_segment)
1468 gst_event_unref (src->priv->start_segment);
1469 if (seeksegment.rate >= 0.0) {
1470 /* forward, we send data from last_stop to stop */
1471 src->priv->start_segment =
1472 gst_event_new_new_segment_full (FALSE,
1473 seeksegment.rate, seeksegment.applied_rate, seeksegment.format,
1474 seeksegment.last_stop, stop, seeksegment.time);
1476 /* reverse, we send data from last_stop to start */
1477 src->priv->start_segment =
1478 gst_event_new_new_segment_full (FALSE,
1479 seeksegment.rate, seeksegment.applied_rate, seeksegment.format,
1480 seeksegment.start, seeksegment.last_stop, seeksegment.time);
1482 gst_event_set_seqnum (src->priv->start_segment, seqnum);
1483 src->priv->newsegment_pending = TRUE;
1486 src->priv->discont = TRUE;
1487 src->data.ABI.running = TRUE;
1488 /* and restart the task in case it got paused explicitly or by
1489 * the FLUSH_START event we pushed out. */
1490 tres = gst_pad_start_task (src->srcpad, (GstTaskFunction) gst_base_src_loop,
1495 /* and release the lock again so we can continue streaming */
1496 GST_PAD_STREAM_UNLOCK (src->srcpad);
1502 GST_DEBUG_OBJECT (src, "Preparing the seek failed before flushing. "
1507 static const GstQueryType *
1508 gst_base_src_get_query_types (GstElement * element)
1510 static const GstQueryType query_types[] = {
1526 /* all events send to this element directly. This is mainly done from the
1530 gst_base_src_send_event (GstElement * element, GstEvent * event)
1533 gboolean result = FALSE;
1535 src = GST_BASE_SRC (element);
1537 GST_DEBUG_OBJECT (src, "handling event %p %" GST_PTR_FORMAT, event, event);
1539 switch (GST_EVENT_TYPE (event)) {
1540 /* bidirectional events */
1541 case GST_EVENT_FLUSH_START:
1542 case GST_EVENT_FLUSH_STOP:
1543 /* sending random flushes downstream can break stuff,
1544 * especially sync since all segment info will get flushed */
1547 /* downstream serialized events */
1550 GstBaseSrcClass *bclass;
1552 bclass = GST_BASE_SRC_GET_CLASS (src);
1554 /* queue EOS and make sure the task or pull function performs the EOS
1557 * We have two possibilities:
1559 * - Before we are to enter the _create function, we check the pending_eos
1560 * first and do EOS instead of entering it.
1561 * - If we are in the _create function or we did not manage to set the
1562 * flag fast enough and we are about to enter the _create function,
1563 * we unlock it so that we exit with WRONG_STATE immediatly. We then
1564 * check the EOS flag and do the EOS logic.
1566 g_atomic_int_set (&src->priv->pending_eos, TRUE);
1567 GST_DEBUG_OBJECT (src, "EOS marked, calling unlock");
1569 /* unlock the _create function so that we can check the pending_eos flag
1570 * and we can do EOS. This will eventually release the LIVE_LOCK again so
1571 * that we can grab it and stop the unlock again. We don't take the stream
1572 * lock so that this operation is guaranteed to never block. */
1574 bclass->unlock (src);
1576 GST_DEBUG_OBJECT (src, "unlock called, waiting for LIVE_LOCK");
1578 GST_LIVE_LOCK (src);
1579 GST_DEBUG_OBJECT (src, "LIVE_LOCK acquired, calling unlock_stop");
1580 /* now stop the unlock of the streaming thread again. Grabbing the live
1581 * lock is enough because that protects the create function. */
1582 if (bclass->unlock_stop)
1583 bclass->unlock_stop (src);
1584 GST_LIVE_UNLOCK (src);
1589 case GST_EVENT_NEWSEGMENT:
1590 /* sending random NEWSEGMENT downstream can break sync. */
1593 case GST_EVENT_CUSTOM_DOWNSTREAM:
1594 case GST_EVENT_CUSTOM_BOTH:
1595 /* Insert TAG, CUSTOM_DOWNSTREAM, CUSTOM_BOTH in the dataflow */
1596 GST_OBJECT_LOCK (src);
1597 src->priv->pending_events =
1598 g_list_append (src->priv->pending_events, event);
1599 g_atomic_int_set (&src->priv->have_events, TRUE);
1600 GST_OBJECT_UNLOCK (src);
1604 case GST_EVENT_BUFFERSIZE:
1605 /* does not seem to make much sense currently */
1608 /* upstream events */
1610 /* elements should override send_event and do something */
1612 case GST_EVENT_SEEK:
1616 GST_OBJECT_LOCK (src->srcpad);
1617 if (GST_PAD_ACTIVATE_MODE (src->srcpad) == GST_ACTIVATE_PULL)
1619 started = GST_PAD_ACTIVATE_MODE (src->srcpad) == GST_ACTIVATE_PUSH;
1620 GST_OBJECT_UNLOCK (src->srcpad);
1623 GST_DEBUG_OBJECT (src, "performing seek");
1624 /* when we are running in push mode, we can execute the
1625 * seek right now, we need to unlock. */
1626 result = gst_base_src_perform_seek (src, event, TRUE);
1630 /* else we store the event and execute the seek when we
1632 GST_OBJECT_LOCK (src);
1633 GST_DEBUG_OBJECT (src, "queueing seek");
1634 event_p = &src->data.ABI.pending_seek;
1635 gst_event_replace ((GstEvent **) event_p, event);
1636 GST_OBJECT_UNLOCK (src);
1637 /* assume the seek will work */
1642 case GST_EVENT_NAVIGATION:
1643 /* could make sense for elements that do something with navigation events
1644 * but then they would need to override the send_event function */
1646 case GST_EVENT_LATENCY:
1647 /* does not seem to make sense currently */
1651 case GST_EVENT_CUSTOM_UPSTREAM:
1652 /* override send_event if you want this */
1654 case GST_EVENT_CUSTOM_DOWNSTREAM_OOB:
1655 case GST_EVENT_CUSTOM_BOTH_OOB:
1656 /* insert a random custom event into the pipeline */
1657 GST_DEBUG_OBJECT (src, "pushing custom OOB event downstream");
1658 result = gst_pad_push_event (src->srcpad, event);
1659 /* we gave away the ref to the event in the push */
1666 /* if we still have a ref to the event, unref it now */
1668 gst_event_unref (event);
1675 GST_DEBUG_OBJECT (src, "cannot perform seek when operating in pull mode");
1676 GST_OBJECT_UNLOCK (src->srcpad);
1683 gst_base_src_seekable (GstBaseSrc * src)
1685 GstBaseSrcClass *bclass;
1686 bclass = GST_BASE_SRC_GET_CLASS (src);
1687 if (bclass->is_seekable)
1688 return bclass->is_seekable (src);
1694 gst_base_src_update_qos (GstBaseSrc * src,
1695 gdouble proportion, GstClockTimeDiff diff, GstClockTime timestamp)
1697 GST_CAT_DEBUG_OBJECT (GST_CAT_QOS, src,
1698 "qos: proportion: %lf, diff %" G_GINT64_FORMAT ", timestamp %"
1699 GST_TIME_FORMAT, proportion, diff, GST_TIME_ARGS (timestamp));
1701 GST_OBJECT_LOCK (src);
1702 src->priv->proportion = proportion;
1703 src->priv->earliest_time = timestamp + diff;
1704 GST_OBJECT_UNLOCK (src);
1709 gst_base_src_default_event (GstBaseSrc * src, GstEvent * event)
1713 GST_DEBUG_OBJECT (src, "handle event %" GST_PTR_FORMAT, event);
1715 switch (GST_EVENT_TYPE (event)) {
1716 case GST_EVENT_SEEK:
1717 /* is normally called when in push mode */
1718 if (!gst_base_src_seekable (src))
1721 result = gst_base_src_perform_seek (src, event, TRUE);
1723 case GST_EVENT_FLUSH_START:
1724 /* cancel any blocking getrange, is normally called
1725 * when in pull mode. */
1726 result = gst_base_src_set_flushing (src, TRUE, FALSE, TRUE, NULL);
1728 case GST_EVENT_FLUSH_STOP:
1729 result = gst_base_src_set_flushing (src, FALSE, TRUE, TRUE, NULL);
1734 GstClockTimeDiff diff;
1735 GstClockTime timestamp;
1737 gst_event_parse_qos (event, &proportion, &diff, ×tamp);
1738 gst_base_src_update_qos (src, proportion, diff, timestamp);
1751 GST_DEBUG_OBJECT (src, "is not seekable");
1757 gst_base_src_event_handler (GstPad * pad, GstEvent * event)
1760 GstBaseSrcClass *bclass;
1761 gboolean result = FALSE;
1763 src = GST_BASE_SRC (gst_pad_get_parent (pad));
1764 if (G_UNLIKELY (src == NULL)) {
1765 gst_event_unref (event);
1769 bclass = GST_BASE_SRC_GET_CLASS (src);
1771 if (bclass->event) {
1772 if (!(result = bclass->event (src, event)))
1773 goto subclass_failed;
1777 gst_event_unref (event);
1778 gst_object_unref (src);
1785 GST_DEBUG_OBJECT (src, "subclass refused event");
1791 gst_base_src_set_property (GObject * object, guint prop_id,
1792 const GValue * value, GParamSpec * pspec)
1796 src = GST_BASE_SRC (object);
1799 case PROP_BLOCKSIZE:
1800 gst_base_src_set_blocksize (src, g_value_get_ulong (value));
1802 case PROP_NUM_BUFFERS:
1803 src->num_buffers = g_value_get_int (value);
1806 src->data.ABI.typefind = g_value_get_boolean (value);
1808 case PROP_DO_TIMESTAMP:
1809 gst_base_src_set_do_timestamp (src, g_value_get_boolean (value));
1812 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
1818 gst_base_src_get_property (GObject * object, guint prop_id, GValue * value,
1823 src = GST_BASE_SRC (object);
1826 case PROP_BLOCKSIZE:
1827 g_value_set_ulong (value, gst_base_src_get_blocksize (src));
1829 case PROP_NUM_BUFFERS:
1830 g_value_set_int (value, src->num_buffers);
1833 g_value_set_boolean (value, src->data.ABI.typefind);
1835 case PROP_DO_TIMESTAMP:
1836 g_value_set_boolean (value, gst_base_src_get_do_timestamp (src));
1839 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
1844 /* with STREAM_LOCK and LOCK */
1845 static GstClockReturn
1846 gst_base_src_wait (GstBaseSrc * basesrc, GstClock * clock, GstClockTime time)
1851 id = gst_clock_new_single_shot_id (clock, time);
1853 basesrc->clock_id = id;
1854 /* release the live lock while waiting */
1855 GST_LIVE_UNLOCK (basesrc);
1857 ret = gst_clock_id_wait (id, NULL);
1859 GST_LIVE_LOCK (basesrc);
1860 gst_clock_id_unref (id);
1861 basesrc->clock_id = NULL;
1866 /* perform synchronisation on a buffer.
1869 static GstClockReturn
1870 gst_base_src_do_sync (GstBaseSrc * basesrc, GstBuffer * buffer)
1872 GstClockReturn result;
1873 GstClockTime start, end;
1874 GstBaseSrcClass *bclass;
1875 GstClockTime base_time;
1877 GstClockTime now = GST_CLOCK_TIME_NONE, timestamp;
1878 gboolean do_timestamp, first, pseudo_live;
1880 bclass = GST_BASE_SRC_GET_CLASS (basesrc);
1883 if (bclass->get_times)
1884 bclass->get_times (basesrc, buffer, &start, &end);
1886 /* get buffer timestamp */
1887 timestamp = GST_BUFFER_TIMESTAMP (buffer);
1889 /* grab the lock to prepare for clocking and calculate the startup
1891 GST_OBJECT_LOCK (basesrc);
1893 /* if we are asked to sync against the clock we are a pseudo live element */
1894 pseudo_live = (start != -1 && basesrc->is_live);
1895 /* check for the first buffer */
1896 first = (basesrc->priv->latency == -1);
1898 if (timestamp != -1 && pseudo_live) {
1899 GstClockTime latency;
1901 /* we have a timestamp and a sync time, latency is the diff */
1902 if (timestamp <= start)
1903 latency = start - timestamp;
1908 GST_DEBUG_OBJECT (basesrc, "pseudo_live with latency %" GST_TIME_FORMAT,
1909 GST_TIME_ARGS (latency));
1910 /* first time we calculate latency, just configure */
1911 basesrc->priv->latency = latency;
1913 if (basesrc->priv->latency != latency) {
1914 /* we have a new latency, FIXME post latency message */
1915 basesrc->priv->latency = latency;
1916 GST_DEBUG_OBJECT (basesrc, "latency changed to %" GST_TIME_FORMAT,
1917 GST_TIME_ARGS (latency));
1921 GST_DEBUG_OBJECT (basesrc, "no latency needed, live %d, sync %d",
1922 basesrc->is_live, start != -1);
1923 basesrc->priv->latency = 0;
1926 /* get clock, if no clock, we can't sync or do timestamps */
1927 if ((clock = GST_ELEMENT_CLOCK (basesrc)) == NULL)
1930 base_time = GST_ELEMENT_CAST (basesrc)->base_time;
1932 do_timestamp = basesrc->priv->do_timestamp;
1934 /* first buffer, calculate the timestamp offset */
1936 GstClockTime running_time;
1938 now = gst_clock_get_time (clock);
1939 running_time = now - base_time;
1941 GST_LOG_OBJECT (basesrc,
1942 "startup timestamp: %" GST_TIME_FORMAT ", running_time %"
1943 GST_TIME_FORMAT, GST_TIME_ARGS (timestamp),
1944 GST_TIME_ARGS (running_time));
1946 if (pseudo_live && timestamp != -1) {
1947 /* live source and we need to sync, add startup latency to all timestamps
1948 * to get the real running_time. Live sources should always timestamp
1949 * according to the current running time. */
1950 basesrc->priv->ts_offset = GST_CLOCK_DIFF (timestamp, running_time);
1952 GST_LOG_OBJECT (basesrc, "live with sync, ts_offset %" GST_TIME_FORMAT,
1953 GST_TIME_ARGS (basesrc->priv->ts_offset));
1955 basesrc->priv->ts_offset = 0;
1956 GST_LOG_OBJECT (basesrc, "no timestamp offset needed");
1959 if (!GST_CLOCK_TIME_IS_VALID (timestamp)) {
1961 timestamp = running_time;
1965 GST_BUFFER_TIMESTAMP (buffer) = timestamp;
1967 GST_LOG_OBJECT (basesrc, "created timestamp: %" GST_TIME_FORMAT,
1968 GST_TIME_ARGS (timestamp));
1971 /* add the timestamp offset we need for sync */
1972 timestamp += basesrc->priv->ts_offset;
1974 /* not the first buffer, the timestamp is the diff between the clock and
1976 if (do_timestamp && !GST_CLOCK_TIME_IS_VALID (timestamp)) {
1977 now = gst_clock_get_time (clock);
1979 GST_BUFFER_TIMESTAMP (buffer) = now - base_time;
1981 GST_LOG_OBJECT (basesrc, "created timestamp: %" GST_TIME_FORMAT,
1982 GST_TIME_ARGS (now - base_time));
1986 /* if we don't have a buffer timestamp, we don't sync */
1987 if (!GST_CLOCK_TIME_IS_VALID (start))
1990 if (basesrc->is_live && GST_CLOCK_TIME_IS_VALID (timestamp)) {
1991 /* for pseudo live sources, add our ts_offset to the timestamp */
1992 GST_BUFFER_TIMESTAMP (buffer) += basesrc->priv->ts_offset;
1993 start += basesrc->priv->ts_offset;
1996 GST_LOG_OBJECT (basesrc,
1997 "waiting for clock, base time %" GST_TIME_FORMAT
1998 ", stream_start %" GST_TIME_FORMAT,
1999 GST_TIME_ARGS (base_time), GST_TIME_ARGS (start));
2000 GST_OBJECT_UNLOCK (basesrc);
2002 result = gst_base_src_wait (basesrc, clock, start + base_time);
2004 GST_LOG_OBJECT (basesrc, "clock entry done: %d", result);
2011 GST_DEBUG_OBJECT (basesrc, "we have no clock");
2012 GST_OBJECT_UNLOCK (basesrc);
2013 return GST_CLOCK_OK;
2017 GST_DEBUG_OBJECT (basesrc, "no sync needed");
2018 GST_OBJECT_UNLOCK (basesrc);
2019 return GST_CLOCK_OK;
2023 /* Called with STREAM_LOCK and LIVE_LOCK */
2025 gst_base_src_update_length (GstBaseSrc * src, guint64 offset, guint * length)
2027 guint64 size, maxsize;
2028 GstBaseSrcClass *bclass;
2032 bclass = GST_BASE_SRC_GET_CLASS (src);
2034 format = src->segment.format;
2035 stop = src->segment.stop;
2036 /* get total file size */
2037 size = (guint64) src->segment.duration;
2039 /* only operate if we are working with bytes */
2040 if (format != GST_FORMAT_BYTES)
2043 /* the max amount of bytes to read is the total size or
2044 * up to the segment.stop if present. */
2046 maxsize = MIN (size, stop);
2050 GST_DEBUG_OBJECT (src,
2051 "reading offset %" G_GUINT64_FORMAT ", length %u, size %" G_GINT64_FORMAT
2052 ", segment.stop %" G_GINT64_FORMAT ", maxsize %" G_GINT64_FORMAT, offset,
2053 *length, size, stop, maxsize);
2055 /* check size if we have one */
2056 if (maxsize != -1) {
2057 /* if we run past the end, check if the file became bigger and
2059 if (G_UNLIKELY (offset + *length >= maxsize)) {
2060 /* see if length of the file changed */
2061 if (bclass->get_size)
2062 if (!bclass->get_size (src, &size))
2065 /* make sure we don't exceed the configured segment stop
2068 maxsize = MIN (size, stop);
2072 /* if we are at or past the end, EOS */
2073 if (G_UNLIKELY (offset >= maxsize))
2074 goto unexpected_length;
2076 /* else we can clip to the end */
2077 if (G_UNLIKELY (offset + *length >= maxsize))
2078 *length = maxsize - offset;
2083 /* keep track of current position and update duration.
2084 * segment is in bytes, we checked that above. */
2085 GST_OBJECT_LOCK (src);
2086 gst_segment_set_duration (&src->segment, GST_FORMAT_BYTES, size);
2087 gst_segment_set_last_stop (&src->segment, GST_FORMAT_BYTES, offset);
2088 GST_OBJECT_UNLOCK (src);
2099 /* must be called with LIVE_LOCK */
2100 static GstFlowReturn
2101 gst_base_src_get_range (GstBaseSrc * src, guint64 offset, guint length,
2105 GstBaseSrcClass *bclass;
2106 GstClockReturn status;
2108 bclass = GST_BASE_SRC_GET_CLASS (src);
2112 if (G_UNLIKELY (!src->live_running)) {
2113 ret = gst_base_src_wait_playing (src);
2114 if (ret != GST_FLOW_OK)
2119 if (G_UNLIKELY (!GST_OBJECT_FLAG_IS_SET (src, GST_BASE_SRC_STARTED)))
2122 if (G_UNLIKELY (!bclass->create))
2125 if (G_UNLIKELY (!gst_base_src_update_length (src, offset, &length)))
2126 goto unexpected_length;
2128 /* normally we don't count buffers */
2129 if (G_UNLIKELY (src->num_buffers_left >= 0)) {
2130 if (src->num_buffers_left == 0)
2131 goto reached_num_buffers;
2133 src->num_buffers_left--;
2136 /* don't enter the create function if a pending EOS event was set. For the
2137 * logic of the pending_eos, check the event function of this class. */
2138 if (G_UNLIKELY (g_atomic_int_get (&src->priv->pending_eos)))
2141 GST_DEBUG_OBJECT (src,
2142 "calling create offset %" G_GUINT64_FORMAT " length %u, time %"
2143 G_GINT64_FORMAT, offset, length, src->segment.time);
2145 ret = bclass->create (src, offset, length, buf);
2147 /* The create function could be unlocked because we have a pending EOS. It's
2148 * possible that we have a valid buffer from create that we need to
2149 * discard when the create function returned _OK. */
2150 if (G_UNLIKELY (g_atomic_int_get (&src->priv->pending_eos))) {
2151 if (ret == GST_FLOW_OK) {
2152 gst_buffer_unref (*buf);
2158 if (G_UNLIKELY (ret != GST_FLOW_OK))
2161 /* no timestamp set and we are at offset 0, we can timestamp with 0 */
2162 if (offset == 0 && src->segment.time == 0
2163 && GST_BUFFER_TIMESTAMP (*buf) == -1) {
2164 *buf = gst_buffer_make_metadata_writable (*buf);
2165 GST_BUFFER_TIMESTAMP (*buf) = 0;
2168 /* set pad caps on the buffer if the buffer had no caps */
2169 if (GST_BUFFER_CAPS (*buf) == NULL) {
2170 *buf = gst_buffer_make_metadata_writable (*buf);
2171 gst_buffer_set_caps (*buf, GST_PAD_CAPS (src->srcpad));
2174 /* now sync before pushing the buffer */
2175 status = gst_base_src_do_sync (src, *buf);
2177 /* waiting for the clock could have made us flushing */
2178 if (G_UNLIKELY (src->priv->flushing))
2182 case GST_CLOCK_EARLY:
2183 /* the buffer is too late. We currently don't drop the buffer. */
2184 GST_DEBUG_OBJECT (src, "buffer too late!, returning anyway");
2187 /* buffer synchronised properly */
2188 GST_DEBUG_OBJECT (src, "buffer ok");
2190 case GST_CLOCK_UNSCHEDULED:
2191 /* this case is triggered when we were waiting for the clock and
2192 * it got unlocked because we did a state change. In any case, get rid of
2194 gst_buffer_unref (*buf);
2196 if (!src->live_running) {
2197 /* We return WRONG_STATE when we are not running to stop the dataflow also
2198 * get rid of the produced buffer. */
2199 GST_DEBUG_OBJECT (src,
2200 "clock was unscheduled (%d), returning WRONG_STATE", status);
2201 ret = GST_FLOW_WRONG_STATE;
2203 /* If we are running when this happens, we quickly switched between
2204 * pause and playing. We try to produce a new buffer */
2205 GST_DEBUG_OBJECT (src,
2206 "clock was unscheduled (%d), but we are running", status);
2211 /* all other result values are unexpected and errors */
2212 GST_ELEMENT_ERROR (src, CORE, CLOCK,
2213 (_("Internal clock error.")),
2214 ("clock returned unexpected return value %d", status));
2215 gst_buffer_unref (*buf);
2217 ret = GST_FLOW_ERROR;
2225 GST_DEBUG_OBJECT (src, "wait_playing returned %d (%s)", ret,
2226 gst_flow_get_name (ret));
2231 GST_DEBUG_OBJECT (src, "create returned %d (%s)", ret,
2232 gst_flow_get_name (ret));
2237 GST_DEBUG_OBJECT (src, "getrange but not started");
2238 return GST_FLOW_WRONG_STATE;
2242 GST_DEBUG_OBJECT (src, "no create function");
2243 return GST_FLOW_ERROR;
2247 GST_DEBUG_OBJECT (src, "unexpected length %u (offset=%" G_GUINT64_FORMAT
2248 ", size=%" G_GINT64_FORMAT ")", length, offset, src->segment.duration);
2249 return GST_FLOW_UNEXPECTED;
2251 reached_num_buffers:
2253 GST_DEBUG_OBJECT (src, "sent all buffers");
2254 return GST_FLOW_UNEXPECTED;
2258 GST_DEBUG_OBJECT (src, "we are flushing");
2259 gst_buffer_unref (*buf);
2261 return GST_FLOW_WRONG_STATE;
2265 GST_DEBUG_OBJECT (src, "we are EOS");
2266 return GST_FLOW_UNEXPECTED;
2270 static GstFlowReturn
2271 gst_base_src_pad_get_range (GstPad * pad, guint64 offset, guint length,
2277 src = GST_BASE_SRC_CAST (gst_object_ref (GST_OBJECT_PARENT (pad)));
2279 GST_LIVE_LOCK (src);
2280 if (G_UNLIKELY (src->priv->flushing))
2283 res = gst_base_src_get_range (src, offset, length, buf);
2286 GST_LIVE_UNLOCK (src);
2288 gst_object_unref (src);
2295 GST_DEBUG_OBJECT (src, "we are flushing");
2296 res = GST_FLOW_WRONG_STATE;
2302 gst_base_src_default_check_get_range (GstBaseSrc * src)
2306 if (!GST_OBJECT_FLAG_IS_SET (src, GST_BASE_SRC_STARTED)) {
2307 GST_LOG_OBJECT (src, "doing start/stop to check get_range support");
2308 if (G_LIKELY (gst_base_src_start (src)))
2309 gst_base_src_stop (src);
2312 /* we can operate in getrange mode if the native format is bytes
2313 * and we are seekable, this condition is set in the random_access
2314 * flag and is set in the _start() method. */
2315 res = src->random_access;
2321 gst_base_src_check_get_range (GstBaseSrc * src)
2323 GstBaseSrcClass *bclass;
2326 bclass = GST_BASE_SRC_GET_CLASS (src);
2328 if (bclass->check_get_range == NULL)
2331 res = bclass->check_get_range (src);
2332 GST_LOG_OBJECT (src, "%s() returned %d",
2333 GST_DEBUG_FUNCPTR_NAME (bclass->check_get_range), (gint) res);
2340 GST_WARNING_OBJECT (src, "no check_get_range function set");
2346 gst_base_src_pad_check_get_range (GstPad * pad)
2351 src = GST_BASE_SRC (GST_OBJECT_PARENT (pad));
2353 res = gst_base_src_check_get_range (src);
2359 gst_base_src_loop (GstPad * pad)
2362 GstBuffer *buf = NULL;
2367 GList *pending_events = NULL, *tmp;
2371 src = GST_BASE_SRC (GST_OBJECT_PARENT (pad));
2373 GST_LIVE_LOCK (src);
2375 if (G_UNLIKELY (src->priv->flushing))
2378 src->priv->last_sent_eos = FALSE;
2380 blocksize = src->blocksize;
2382 /* if we operate in bytes, we can calculate an offset */
2383 if (src->segment.format == GST_FORMAT_BYTES) {
2384 position = src->segment.last_stop;
2385 /* for negative rates, start with subtracting the blocksize */
2386 if (src->segment.rate < 0.0) {
2387 /* we cannot go below segment.start */
2388 if (position > src->segment.start + blocksize)
2389 position -= blocksize;
2391 /* last block, remainder up to segment.start */
2392 blocksize = position - src->segment.start;
2393 position = src->segment.start;
2399 GST_LOG_OBJECT (src, "next_ts %" GST_TIME_FORMAT " size %lu",
2400 GST_TIME_ARGS (position), blocksize);
2402 ret = gst_base_src_get_range (src, position, blocksize, &buf);
2403 if (G_UNLIKELY (ret != GST_FLOW_OK)) {
2404 GST_INFO_OBJECT (src, "pausing after gst_base_src_get_range() = %s",
2405 gst_flow_get_name (ret));
2406 GST_LIVE_UNLOCK (src);
2409 /* this should not happen */
2410 if (G_UNLIKELY (buf == NULL))
2413 /* push events to close/start our segment before we push the buffer. */
2414 if (G_UNLIKELY (src->priv->close_segment)) {
2415 gst_pad_push_event (pad, src->priv->close_segment);
2416 src->priv->close_segment = NULL;
2418 if (G_UNLIKELY (src->priv->start_segment)) {
2419 gst_pad_push_event (pad, src->priv->start_segment);
2420 src->priv->start_segment = NULL;
2422 src->priv->newsegment_pending = FALSE;
2424 if (g_atomic_int_get (&src->priv->have_events)) {
2425 GST_OBJECT_LOCK (src);
2426 /* take the events */
2427 pending_events = src->priv->pending_events;
2428 src->priv->pending_events = NULL;
2429 g_atomic_int_set (&src->priv->have_events, FALSE);
2430 GST_OBJECT_UNLOCK (src);
2433 /* Push out pending events if any */
2434 if (G_UNLIKELY (pending_events != NULL)) {
2435 for (tmp = pending_events; tmp; tmp = g_list_next (tmp)) {
2436 GstEvent *ev = (GstEvent *) tmp->data;
2437 gst_pad_push_event (pad, ev);
2439 g_list_free (pending_events);
2442 /* figure out the new position */
2443 switch (src->segment.format) {
2444 case GST_FORMAT_BYTES:
2446 guint bufsize = GST_BUFFER_SIZE (buf);
2448 /* we subtracted above for negative rates */
2449 if (src->segment.rate >= 0.0)
2450 position += bufsize;
2453 case GST_FORMAT_TIME:
2455 GstClockTime start, duration;
2457 start = GST_BUFFER_TIMESTAMP (buf);
2458 duration = GST_BUFFER_DURATION (buf);
2460 if (GST_CLOCK_TIME_IS_VALID (start))
2463 position = src->segment.last_stop;
2465 if (GST_CLOCK_TIME_IS_VALID (duration)) {
2466 if (src->segment.rate >= 0.0)
2467 position += duration;
2468 else if (position > duration)
2469 position -= duration;
2475 case GST_FORMAT_DEFAULT:
2476 if (src->segment.rate >= 0.0)
2477 position = GST_BUFFER_OFFSET_END (buf);
2479 position = GST_BUFFER_OFFSET (buf);
2485 if (position != -1) {
2486 if (src->segment.rate >= 0.0) {
2487 /* positive rate, check if we reached the stop */
2488 if (src->segment.stop != -1) {
2489 if (position >= src->segment.stop) {
2491 position = src->segment.stop;
2495 /* negative rate, check if we reached the start. start is always set to
2496 * something different from -1 */
2497 if (position <= src->segment.start) {
2499 position = src->segment.start;
2501 /* when going reverse, all buffers are DISCONT */
2502 src->priv->discont = TRUE;
2504 GST_OBJECT_LOCK (src);
2505 gst_segment_set_last_stop (&src->segment, src->segment.format, position);
2506 GST_OBJECT_UNLOCK (src);
2509 if (G_UNLIKELY (src->priv->discont)) {
2510 buf = gst_buffer_make_metadata_writable (buf);
2511 GST_BUFFER_FLAG_SET (buf, GST_BUFFER_FLAG_DISCONT);
2512 src->priv->discont = FALSE;
2514 GST_LIVE_UNLOCK (src);
2516 ret = gst_pad_push (pad, buf);
2517 if (G_UNLIKELY (ret != GST_FLOW_OK)) {
2518 GST_INFO_OBJECT (src, "pausing after gst_pad_push() = %s",
2519 gst_flow_get_name (ret));
2523 if (G_UNLIKELY (eos)) {
2524 GST_INFO_OBJECT (src, "pausing after end of segment");
2525 ret = GST_FLOW_UNEXPECTED;
2535 GST_DEBUG_OBJECT (src, "we are flushing");
2536 GST_LIVE_UNLOCK (src);
2537 ret = GST_FLOW_WRONG_STATE;
2542 const gchar *reason = gst_flow_get_name (ret);
2545 GST_DEBUG_OBJECT (src, "pausing task, reason %s", reason);
2546 src->data.ABI.running = FALSE;
2547 gst_pad_pause_task (pad);
2548 if (ret == GST_FLOW_UNEXPECTED) {
2549 gboolean flag_segment;
2553 /* perform EOS logic */
2554 flag_segment = (src->segment.flags & GST_SEEK_FLAG_SEGMENT) != 0;
2555 format = src->segment.format;
2556 last_stop = src->segment.last_stop;
2559 GstMessage *message;
2561 message = gst_message_new_segment_done (GST_OBJECT_CAST (src),
2563 gst_message_set_seqnum (message, src->priv->seqnum);
2564 gst_element_post_message (GST_ELEMENT_CAST (src), message);
2566 event = gst_event_new_eos ();
2567 gst_event_set_seqnum (event, src->priv->seqnum);
2568 gst_pad_push_event (pad, event);
2569 src->priv->last_sent_eos = TRUE;
2571 } else if (ret == GST_FLOW_NOT_LINKED || ret <= GST_FLOW_UNEXPECTED) {
2572 event = gst_event_new_eos ();
2573 gst_event_set_seqnum (event, src->priv->seqnum);
2574 /* for fatal errors we post an error message, post the error
2575 * first so the app knows about the error first.
2576 * Also don't do this for WRONG_STATE because it happens
2577 * due to flushing and posting an error message because of
2578 * that is the wrong thing to do, e.g. when we're doing
2579 * a flushing seek. */
2580 GST_ELEMENT_ERROR (src, STREAM, FAILED,
2581 (_("Internal data flow error.")),
2582 ("streaming task paused, reason %s (%d)", reason, ret));
2583 gst_pad_push_event (pad, event);
2584 src->priv->last_sent_eos = TRUE;
2590 GST_ELEMENT_ERROR (src, STREAM, FAILED,
2591 (_("Internal data flow error.")), ("element returned NULL buffer"));
2592 GST_LIVE_UNLOCK (src);
2597 /* default negotiation code.
2599 * Take intersection between src and sink pads, take first
2603 gst_base_src_default_negotiate (GstBaseSrc * basesrc)
2606 GstCaps *caps = NULL;
2607 GstCaps *peercaps = NULL;
2608 gboolean result = FALSE;
2610 /* first see what is possible on our source pad */
2611 thiscaps = gst_pad_get_caps_reffed (GST_BASE_SRC_PAD (basesrc));
2612 GST_DEBUG_OBJECT (basesrc, "caps of src: %" GST_PTR_FORMAT, thiscaps);
2613 /* nothing or anything is allowed, we're done */
2614 if (thiscaps == NULL || gst_caps_is_any (thiscaps))
2615 goto no_nego_needed;
2617 if (G_UNLIKELY (gst_caps_is_empty (thiscaps)))
2620 /* get the peer caps */
2621 peercaps = gst_pad_peer_get_caps_reffed (GST_BASE_SRC_PAD (basesrc));
2622 GST_DEBUG_OBJECT (basesrc, "caps of peer: %" GST_PTR_FORMAT, peercaps);
2624 /* get intersection */
2626 gst_caps_intersect_full (peercaps, thiscaps, GST_CAPS_INTERSECT_FIRST);
2627 GST_DEBUG_OBJECT (basesrc, "intersect: %" GST_PTR_FORMAT, caps);
2628 gst_caps_unref (peercaps);
2630 /* no peer, work with our own caps then */
2631 caps = gst_caps_copy (thiscaps);
2633 gst_caps_unref (thiscaps);
2635 /* take first (and best, since they are sorted) possibility */
2636 gst_caps_truncate (caps);
2639 if (!gst_caps_is_empty (caps)) {
2640 gst_pad_fixate_caps (GST_BASE_SRC_PAD (basesrc), caps);
2641 GST_DEBUG_OBJECT (basesrc, "fixated to: %" GST_PTR_FORMAT, caps);
2643 if (gst_caps_is_any (caps)) {
2644 /* hmm, still anything, so element can do anything and
2645 * nego is not needed */
2647 } else if (gst_caps_is_fixed (caps)) {
2648 /* yay, fixed caps, use those then, it's possible that the subclass does
2649 * not accept this caps after all and we have to fail. */
2650 result = gst_pad_set_caps (GST_BASE_SRC_PAD (basesrc), caps);
2653 gst_caps_unref (caps);
2655 GST_DEBUG_OBJECT (basesrc, "no common caps");
2661 GST_DEBUG_OBJECT (basesrc, "no negotiation needed");
2663 gst_caps_unref (thiscaps);
2668 GST_ELEMENT_ERROR (basesrc, STREAM, FORMAT,
2669 ("No supported formats found"),
2670 ("This element did not produce valid caps"));
2672 gst_caps_unref (thiscaps);
2678 gst_base_src_negotiate (GstBaseSrc * basesrc)
2680 GstBaseSrcClass *bclass;
2681 gboolean result = TRUE;
2683 bclass = GST_BASE_SRC_GET_CLASS (basesrc);
2685 if (bclass->negotiate)
2686 result = bclass->negotiate (basesrc);
2692 gst_base_src_start (GstBaseSrc * basesrc)
2694 GstBaseSrcClass *bclass;
2700 if (GST_OBJECT_FLAG_IS_SET (basesrc, GST_BASE_SRC_STARTED))
2703 GST_DEBUG_OBJECT (basesrc, "starting source");
2705 basesrc->num_buffers_left = basesrc->num_buffers;
2707 GST_OBJECT_LOCK (basesrc);
2708 gst_segment_init (&basesrc->segment, basesrc->segment.format);
2709 GST_OBJECT_UNLOCK (basesrc);
2711 basesrc->data.ABI.running = FALSE;
2712 basesrc->priv->newsegment_pending = FALSE;
2714 bclass = GST_BASE_SRC_GET_CLASS (basesrc);
2716 result = bclass->start (basesrc);
2721 goto could_not_start;
2723 GST_OBJECT_FLAG_SET (basesrc, GST_BASE_SRC_STARTED);
2725 format = basesrc->segment.format;
2727 /* figure out the size */
2728 if (format == GST_FORMAT_BYTES) {
2729 if (bclass->get_size) {
2730 if (!(result = bclass->get_size (basesrc, &size)))
2736 GST_DEBUG_OBJECT (basesrc, "setting size %" G_GUINT64_FORMAT, size);
2737 /* only update the size when operating in bytes, subclass is supposed
2738 * to set duration in the start method for other formats */
2739 GST_OBJECT_LOCK (basesrc);
2740 gst_segment_set_duration (&basesrc->segment, GST_FORMAT_BYTES, size);
2741 GST_OBJECT_UNLOCK (basesrc);
2746 GST_DEBUG_OBJECT (basesrc,
2747 "format: %s, have size: %d, size: %" G_GUINT64_FORMAT ", duration: %"
2748 G_GINT64_FORMAT, gst_format_get_name (format), result, size,
2749 basesrc->segment.duration);
2751 seekable = gst_base_src_seekable (basesrc);
2752 GST_DEBUG_OBJECT (basesrc, "is seekable: %d", seekable);
2754 /* update for random access flag */
2755 basesrc->random_access = seekable && format == GST_FORMAT_BYTES;
2757 GST_DEBUG_OBJECT (basesrc, "is random_access: %d", basesrc->random_access);
2759 /* run typefind if we are random_access and the typefinding is enabled. */
2760 if (basesrc->random_access && basesrc->data.ABI.typefind && size != -1) {
2763 if (!(caps = gst_type_find_helper (basesrc->srcpad, size)))
2764 goto typefind_failed;
2766 result = gst_pad_set_caps (basesrc->srcpad, caps);
2767 gst_caps_unref (caps);
2769 /* use class or default negotiate function */
2770 if (!(result = gst_base_src_negotiate (basesrc)))
2771 goto could_not_negotiate;
2779 GST_DEBUG_OBJECT (basesrc, "could not start");
2780 /* subclass is supposed to post a message. We don't have to call _stop. */
2783 could_not_negotiate:
2785 GST_DEBUG_OBJECT (basesrc, "could not negotiate, stopping");
2786 GST_ELEMENT_ERROR (basesrc, STREAM, FORMAT,
2787 ("Could not negotiate format"), ("Check your filtered caps, if any"));
2788 /* we must call stop */
2789 gst_base_src_stop (basesrc);
2794 GST_DEBUG_OBJECT (basesrc, "could not typefind, stopping");
2795 GST_ELEMENT_ERROR (basesrc, STREAM, TYPE_NOT_FOUND, (NULL), (NULL));
2796 /* we must call stop */
2797 gst_base_src_stop (basesrc);
2803 gst_base_src_stop (GstBaseSrc * basesrc)
2805 GstBaseSrcClass *bclass;
2806 gboolean result = TRUE;
2808 if (!GST_OBJECT_FLAG_IS_SET (basesrc, GST_BASE_SRC_STARTED))
2811 GST_DEBUG_OBJECT (basesrc, "stopping source");
2813 bclass = GST_BASE_SRC_GET_CLASS (basesrc);
2815 result = bclass->stop (basesrc);
2818 GST_OBJECT_FLAG_UNSET (basesrc, GST_BASE_SRC_STARTED);
2823 /* start or stop flushing dataprocessing
2826 gst_base_src_set_flushing (GstBaseSrc * basesrc,
2827 gboolean flushing, gboolean live_play, gboolean unlock, gboolean * playing)
2829 GstBaseSrcClass *bclass;
2831 bclass = GST_BASE_SRC_GET_CLASS (basesrc);
2833 if (flushing && unlock) {
2834 /* unlock any subclasses, we need to do this before grabbing the
2835 * LIVE_LOCK since we hold this lock before going into ::create. We pass an
2836 * unlock to the params because of backwards compat (see seek handler)*/
2838 bclass->unlock (basesrc);
2841 /* the live lock is released when we are blocked, waiting for playing or
2842 * when we sync to the clock. */
2843 GST_LIVE_LOCK (basesrc);
2845 *playing = basesrc->live_running;
2846 basesrc->priv->flushing = flushing;
2848 /* if we are locked in the live lock, signal it to make it flush */
2849 basesrc->live_running = TRUE;
2851 /* clear pending EOS if any */
2852 g_atomic_int_set (&basesrc->priv->pending_eos, FALSE);
2854 /* step 1, now that we have the LIVE lock, clear our unlock request */
2855 if (bclass->unlock_stop)
2856 bclass->unlock_stop (basesrc);
2858 /* step 2, unblock clock sync (if any) or any other blocking thing */
2859 if (basesrc->clock_id)
2860 gst_clock_id_unschedule (basesrc->clock_id);
2862 /* signal the live source that it can start playing */
2863 basesrc->live_running = live_play;
2865 /* When unlocking drop all delayed events */
2867 GST_OBJECT_LOCK (basesrc);
2868 if (basesrc->priv->pending_events) {
2869 g_list_foreach (basesrc->priv->pending_events, (GFunc) gst_event_unref,
2871 g_list_free (basesrc->priv->pending_events);
2872 basesrc->priv->pending_events = NULL;
2873 g_atomic_int_set (&basesrc->priv->have_events, FALSE);
2875 GST_OBJECT_UNLOCK (basesrc);
2878 GST_LIVE_SIGNAL (basesrc);
2879 GST_LIVE_UNLOCK (basesrc);
2884 /* the purpose of this function is to make sure that a live source blocks in the
2885 * LIVE lock or leaves the LIVE lock and continues playing. */
2887 gst_base_src_set_playing (GstBaseSrc * basesrc, gboolean live_play)
2889 GstBaseSrcClass *bclass;
2891 bclass = GST_BASE_SRC_GET_CLASS (basesrc);
2893 /* unlock subclasses locked in ::create, we only do this when we stop playing. */
2895 GST_DEBUG_OBJECT (basesrc, "unlock");
2897 bclass->unlock (basesrc);
2900 /* we are now able to grab the LIVE lock, when we get it, we can be
2901 * waiting for PLAYING while blocked in the LIVE cond or we can be waiting
2903 GST_LIVE_LOCK (basesrc);
2904 GST_DEBUG_OBJECT (basesrc, "unschedule clock");
2906 /* unblock clock sync (if any) */
2907 if (basesrc->clock_id)
2908 gst_clock_id_unschedule (basesrc->clock_id);
2910 /* configure what to do when we get to the LIVE lock. */
2911 GST_DEBUG_OBJECT (basesrc, "live running %d", live_play);
2912 basesrc->live_running = live_play;
2917 /* clear our unlock request when going to PLAYING */
2918 GST_DEBUG_OBJECT (basesrc, "unlock stop");
2919 if (bclass->unlock_stop)
2920 bclass->unlock_stop (basesrc);
2922 /* for live sources we restart the timestamp correction */
2923 basesrc->priv->latency = -1;
2924 /* have to restart the task in case it stopped because of the unlock when
2925 * we went to PAUSED. Only do this if we operating in push mode. */
2926 GST_OBJECT_LOCK (basesrc->srcpad);
2927 start = (GST_PAD_ACTIVATE_MODE (basesrc->srcpad) == GST_ACTIVATE_PUSH);
2928 GST_OBJECT_UNLOCK (basesrc->srcpad);
2930 gst_pad_start_task (basesrc->srcpad, (GstTaskFunction) gst_base_src_loop,
2932 GST_DEBUG_OBJECT (basesrc, "signal");
2933 GST_LIVE_SIGNAL (basesrc);
2935 GST_LIVE_UNLOCK (basesrc);
2941 gst_base_src_activate_push (GstPad * pad, gboolean active)
2943 GstBaseSrc *basesrc;
2946 basesrc = GST_BASE_SRC (GST_OBJECT_PARENT (pad));
2948 /* prepare subclass first */
2950 GST_DEBUG_OBJECT (basesrc, "Activating in push mode");
2952 if (G_UNLIKELY (!basesrc->can_activate_push))
2953 goto no_push_activation;
2955 if (G_UNLIKELY (!gst_base_src_start (basesrc)))
2958 basesrc->priv->last_sent_eos = FALSE;
2959 basesrc->priv->discont = TRUE;
2960 gst_base_src_set_flushing (basesrc, FALSE, FALSE, FALSE, NULL);
2962 /* do initial seek, which will start the task */
2963 GST_OBJECT_LOCK (basesrc);
2964 event = basesrc->data.ABI.pending_seek;
2965 basesrc->data.ABI.pending_seek = NULL;
2966 GST_OBJECT_UNLOCK (basesrc);
2968 /* no need to unlock anything, the task is certainly
2969 * not running here. The perform seek code will start the task when
2971 if (G_UNLIKELY (!gst_base_src_perform_seek (basesrc, event, FALSE)))
2975 gst_event_unref (event);
2977 GST_DEBUG_OBJECT (basesrc, "Deactivating in push mode");
2979 gst_base_src_set_flushing (basesrc, TRUE, FALSE, TRUE, NULL);
2981 gst_pad_stop_task (pad);
2982 /* now we can stop the source */
2983 if (G_UNLIKELY (!gst_base_src_stop (basesrc)))
2991 GST_WARNING_OBJECT (basesrc, "Subclass disabled push-mode activation");
2996 GST_WARNING_OBJECT (basesrc, "Failed to start in push mode");
3001 GST_ERROR_OBJECT (basesrc, "Failed to perform initial seek");
3003 gst_base_src_set_flushing (basesrc, TRUE, FALSE, TRUE, NULL);
3005 gst_pad_stop_task (pad);
3006 /* Stop the basesrc */
3007 gst_base_src_stop (basesrc);
3009 gst_event_unref (event);
3014 GST_DEBUG_OBJECT (basesrc, "Failed to stop in push mode");
3020 gst_base_src_activate_pull (GstPad * pad, gboolean active)
3022 GstBaseSrc *basesrc;
3024 basesrc = GST_BASE_SRC (GST_OBJECT_PARENT (pad));
3026 /* prepare subclass first */
3028 GST_DEBUG_OBJECT (basesrc, "Activating in pull mode");
3029 if (G_UNLIKELY (!gst_base_src_start (basesrc)))
3032 /* if not random_access, we cannot operate in pull mode for now */
3033 if (G_UNLIKELY (!gst_base_src_check_get_range (basesrc)))
3036 /* stop flushing now but for live sources, still block in the LIVE lock when
3037 * we are not yet PLAYING */
3038 gst_base_src_set_flushing (basesrc, FALSE, FALSE, FALSE, NULL);
3040 GST_DEBUG_OBJECT (basesrc, "Deactivating in pull mode");
3041 /* flush all, there is no task to stop */
3042 gst_base_src_set_flushing (basesrc, TRUE, FALSE, TRUE, NULL);
3044 /* don't send EOS when going from PAUSED => READY when in pull mode */
3045 basesrc->priv->last_sent_eos = TRUE;
3047 if (G_UNLIKELY (!gst_base_src_stop (basesrc)))
3055 GST_ERROR_OBJECT (basesrc, "Failed to start in pull mode");
3060 GST_ERROR_OBJECT (basesrc, "Cannot operate in pull mode, stopping");
3061 gst_base_src_stop (basesrc);
3066 GST_ERROR_OBJECT (basesrc, "Failed to stop in pull mode");
3071 static GstStateChangeReturn
3072 gst_base_src_change_state (GstElement * element, GstStateChange transition)
3074 GstBaseSrc *basesrc;
3075 GstStateChangeReturn result;
3076 gboolean no_preroll = FALSE;
3078 basesrc = GST_BASE_SRC (element);
3080 switch (transition) {
3081 case GST_STATE_CHANGE_NULL_TO_READY:
3083 case GST_STATE_CHANGE_READY_TO_PAUSED:
3084 no_preroll = gst_base_src_is_live (basesrc);
3086 case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
3087 GST_DEBUG_OBJECT (basesrc, "PAUSED->PLAYING");
3088 if (gst_base_src_is_live (basesrc)) {
3089 /* now we can start playback */
3090 gst_base_src_set_playing (basesrc, TRUE);
3098 GST_ELEMENT_CLASS (parent_class)->change_state (element,
3099 transition)) == GST_STATE_CHANGE_FAILURE)
3102 switch (transition) {
3103 case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
3104 GST_DEBUG_OBJECT (basesrc, "PLAYING->PAUSED");
3105 if (gst_base_src_is_live (basesrc)) {
3106 /* make sure we block in the live lock in PAUSED */
3107 gst_base_src_set_playing (basesrc, FALSE);
3111 case GST_STATE_CHANGE_PAUSED_TO_READY:
3113 GstEvent **event_p, *event;
3115 /* we don't need to unblock anything here, the pad deactivation code
3116 * already did this */
3118 /* FIXME, deprecate this behaviour, it is very dangerous.
3119 * the prefered way of sending EOS downstream is by sending
3120 * the EOS event to the element */
3121 if (!basesrc->priv->last_sent_eos) {
3122 GST_DEBUG_OBJECT (basesrc, "Sending EOS event");
3123 event = gst_event_new_eos ();
3124 gst_event_set_seqnum (event, basesrc->priv->seqnum);
3125 gst_pad_push_event (basesrc->srcpad, event);
3126 basesrc->priv->last_sent_eos = TRUE;
3128 g_atomic_int_set (&basesrc->priv->pending_eos, FALSE);
3129 event_p = &basesrc->data.ABI.pending_seek;
3130 gst_event_replace (event_p, NULL);
3131 event_p = &basesrc->priv->close_segment;
3132 gst_event_replace (event_p, NULL);
3133 event_p = &basesrc->priv->start_segment;
3134 gst_event_replace (event_p, NULL);
3137 case GST_STATE_CHANGE_READY_TO_NULL:
3143 if (no_preroll && result == GST_STATE_CHANGE_SUCCESS)
3144 result = GST_STATE_CHANGE_NO_PREROLL;
3151 GST_DEBUG_OBJECT (basesrc, "parent failed state change");