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 * If all the conditions are met for operating in pull mode, #GstBaseSrc is
51 * automatically seekable in push mode as well. The following conditions must
52 * be met to make the element seekable in push mode when the format is not
56 * #GstBaseSrcClass.is_seekable() returns %TRUE.
59 * #GstBaseSrcClass.query() can convert all supported seek formats to the
60 * internal format as set with gst_base_src_set_format().
63 * #GstBaseSrcClass.do_seek() is implemented, performs the seek and returns
68 * When the element does not meet the requirements to operate in pull mode, the
69 * offset and length in the #GstBaseSrcClass.create() method should be ignored.
70 * It is recommended to subclass #GstPushSrc instead, in this situation. If the
71 * element can operate in pull mode but only with specific offsets and
72 * lengths, it is allowed to generate an error when the wrong values are passed
73 * to the #GstBaseSrcClass.create() function.
75 * #GstBaseSrc has support for live sources. Live sources are sources that when
76 * paused discard data, such as audio or video capture devices. A typical live
77 * source also produces data at a fixed rate and thus provides a clock to publish
79 * Use gst_base_src_set_live() to activate the live source mode.
81 * A live source does not produce data in the PAUSED state. This means that the
82 * #GstBaseSrcClass.create() method will not be called in PAUSED but only in
83 * PLAYING. To signal the pipeline that the element will not produce data, the
84 * return value from the READY to PAUSED state will be
85 * #GST_STATE_CHANGE_NO_PREROLL.
87 * A typical live source will timestamp the buffers it creates with the
88 * current running time of the pipeline. This is one reason why a live source
89 * can only produce data in the PLAYING state, when the clock is actually
90 * distributed and running.
92 * Live sources that synchronize and block on the clock (an audio source, for
93 * example) can since 0.10.12 use gst_base_src_wait_playing() when the
94 * #GstBaseSrcClass.create() function was interrupted by a state change to
97 * The #GstBaseSrcClass.get_times() method can be used to implement pseudo-live
98 * sources. It only makes sense to implement the #GstBaseSrcClass.get_times()
99 * function if the source is a live source. The #GstBaseSrcClass.get_times()
100 * function should return timestamps starting from 0, as if it were a non-live
101 * source. The base class will make sure that the timestamps are transformed
102 * into the current running_time. The base source will then wait for the
103 * calculated running_time before pushing out the buffer.
105 * For live sources, the base class will by default report a latency of 0.
106 * For pseudo live sources, the base class will by default measure the difference
107 * between the first buffer timestamp and the start time of get_times and will
108 * report this value as the latency.
109 * Subclasses should override the query function when this behaviour is not
112 * There is only support in #GstBaseSrc for exactly one source pad, which
113 * should be named "src". A source implementation (subclass of #GstBaseSrc)
114 * should install a pad template in its class_init function, like so:
117 * my_element_class_init (GstMyElementClass *klass)
119 * GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
120 * // srctemplate should be a #GstStaticPadTemplate with direction
121 * // #GST_PAD_SRC and name "src"
122 * gst_element_class_add_pad_template (gstelement_class,
123 * gst_static_pad_template_get (&srctemplate));
124 * // see #GstElementDetails
125 * gst_element_class_set_details (gstelement_class, &details);
130 * <title>Controlled shutdown of live sources in applications</title>
132 * Applications that record from a live source may want to stop recording
133 * in a controlled way, so that the recording is stopped, but the data
134 * already in the pipeline is processed to the end (remember that many live
135 * sources would go on recording forever otherwise). For that to happen the
136 * application needs to make the source stop recording and send an EOS
137 * event down the pipeline. The application would then wait for an
138 * EOS message posted on the pipeline's bus to know when all data has
139 * been processed and the pipeline can safely be stopped.
141 * Since GStreamer 0.10.16 an application may send an EOS event to a source
142 * element to make it perform the EOS logic (send EOS event downstream or post a
143 * #GST_MESSAGE_SEGMENT_DONE on the bus). This can typically be done
144 * with the gst_element_send_event() function on the element or its parent bin.
146 * After the EOS has been sent to the element, the application should wait for
147 * an EOS message to be posted on the pipeline's bus. Once this EOS message is
148 * received, it may safely shut down the entire pipeline.
150 * Last reviewed on 2007-12-19 (0.10.16)
162 #include <gst/gst_private.h>
164 #include "gstbasesrc.h"
165 #include "gsttypefindhelper.h"
166 #include <gst/gstmarshal.h>
167 #include <gst/gst-i18n-lib.h>
169 GST_DEBUG_CATEGORY_STATIC (gst_base_src_debug);
170 #define GST_CAT_DEFAULT gst_base_src_debug
172 #define GST_LIVE_GET_LOCK(elem) (GST_BASE_SRC_CAST(elem)->live_lock)
173 #define GST_LIVE_LOCK(elem) g_mutex_lock(GST_LIVE_GET_LOCK(elem))
174 #define GST_LIVE_TRYLOCK(elem) g_mutex_trylock(GST_LIVE_GET_LOCK(elem))
175 #define GST_LIVE_UNLOCK(elem) g_mutex_unlock(GST_LIVE_GET_LOCK(elem))
176 #define GST_LIVE_GET_COND(elem) (GST_BASE_SRC_CAST(elem)->live_cond)
177 #define GST_LIVE_WAIT(elem) g_cond_wait (GST_LIVE_GET_COND (elem), GST_LIVE_GET_LOCK (elem))
178 #define GST_LIVE_TIMED_WAIT(elem, timeval) g_cond_timed_wait (GST_LIVE_GET_COND (elem), GST_LIVE_GET_LOCK (elem),\
180 #define GST_LIVE_SIGNAL(elem) g_cond_signal (GST_LIVE_GET_COND (elem));
181 #define GST_LIVE_BROADCAST(elem) g_cond_broadcast (GST_LIVE_GET_COND (elem));
183 /* BaseSrc signals and args */
190 #define DEFAULT_BLOCKSIZE 4096
191 #define DEFAULT_NUM_BUFFERS -1
192 #define DEFAULT_TYPEFIND FALSE
193 #define DEFAULT_DO_TIMESTAMP FALSE
204 #define GST_BASE_SRC_GET_PRIVATE(obj) \
205 (G_TYPE_INSTANCE_GET_PRIVATE ((obj), GST_TYPE_BASE_SRC, GstBaseSrcPrivate))
207 struct _GstBaseSrcPrivate
212 /* if segment should be sent */
213 gboolean segment_pending;
215 /* if EOS is pending (atomic) */
218 /* startup latency is the time it takes between going to PLAYING and producing
219 * the first BUFFER with running_time 0. This value is included in the latency
221 GstClockTime latency;
222 /* timestamp offset, this is the offset add to the values of gst_times for
223 * pseudo live sources */
224 GstClockTimeDiff ts_offset;
226 gboolean do_timestamp;
227 volatile gint dynamic_size;
229 /* stream sequence number */
232 /* pending events (TAG, CUSTOM_BOTH, CUSTOM_DOWNSTREAM) to be
233 * pushed in the data stream */
234 GList *pending_events;
235 volatile gint have_events;
237 /* QoS *//* with LOCK */
238 gboolean qos_enabled;
240 GstClockTime earliest_time;
243 const GstAllocator *allocator;
248 static GstElementClass *parent_class = NULL;
250 static void gst_base_src_class_init (GstBaseSrcClass * klass);
251 static void gst_base_src_init (GstBaseSrc * src, gpointer g_class);
252 static void gst_base_src_finalize (GObject * object);
256 gst_base_src_get_type (void)
258 static volatile gsize base_src_type = 0;
260 if (g_once_init_enter (&base_src_type)) {
262 static const GTypeInfo base_src_info = {
263 sizeof (GstBaseSrcClass),
266 (GClassInitFunc) gst_base_src_class_init,
271 (GInstanceInitFunc) gst_base_src_init,
274 _type = g_type_register_static (GST_TYPE_ELEMENT,
275 "GstBaseSrc", &base_src_info, G_TYPE_FLAG_ABSTRACT);
276 g_once_init_leave (&base_src_type, _type);
278 return base_src_type;
281 static GstCaps *gst_base_src_default_get_caps (GstBaseSrc * bsrc,
283 static void gst_base_src_default_fixate (GstBaseSrc * src, GstCaps * caps);
284 static void gst_base_src_fixate (GstBaseSrc * src, GstCaps * caps);
286 static gboolean gst_base_src_is_random_access (GstBaseSrc * src);
287 static gboolean gst_base_src_activate_push (GstPad * pad, GstObject * parent,
289 static gboolean gst_base_src_activate_pull (GstPad * pad, GstObject * parent,
291 static void gst_base_src_set_property (GObject * object, guint prop_id,
292 const GValue * value, GParamSpec * pspec);
293 static void gst_base_src_get_property (GObject * object, guint prop_id,
294 GValue * value, GParamSpec * pspec);
295 static gboolean gst_base_src_event (GstPad * pad, GstObject * parent,
297 static gboolean gst_base_src_send_event (GstElement * elem, GstEvent * event);
298 static gboolean gst_base_src_default_event (GstBaseSrc * src, GstEvent * event);
300 static gboolean gst_base_src_query (GstPad * pad, GstObject * parent,
303 static gboolean gst_base_src_activate_pool (GstBaseSrc * basesrc,
305 static gboolean gst_base_src_default_negotiate (GstBaseSrc * basesrc);
306 static gboolean gst_base_src_default_do_seek (GstBaseSrc * src,
307 GstSegment * segment);
308 static gboolean gst_base_src_default_query (GstBaseSrc * src, GstQuery * query);
309 static gboolean gst_base_src_default_prepare_seek_segment (GstBaseSrc * src,
310 GstEvent * event, GstSegment * segment);
311 static GstFlowReturn gst_base_src_default_create (GstBaseSrc * basesrc,
312 guint64 offset, guint size, GstBuffer ** buf);
313 static GstFlowReturn gst_base_src_default_alloc (GstBaseSrc * basesrc,
314 guint64 offset, guint size, GstBuffer ** buf);
316 static gboolean gst_base_src_set_flushing (GstBaseSrc * basesrc,
317 gboolean flushing, gboolean live_play, gboolean unlock, gboolean * playing);
318 static gboolean gst_base_src_start (GstBaseSrc * basesrc);
319 static gboolean gst_base_src_stop (GstBaseSrc * basesrc);
321 static GstStateChangeReturn gst_base_src_change_state (GstElement * element,
322 GstStateChange transition);
324 static void gst_base_src_loop (GstPad * pad);
325 static GstFlowReturn gst_base_src_getrange (GstPad * pad, GstObject * parent,
326 guint64 offset, guint length, GstBuffer ** buf);
327 static GstFlowReturn gst_base_src_get_range (GstBaseSrc * src, guint64 offset,
328 guint length, GstBuffer ** buf);
329 static gboolean gst_base_src_seekable (GstBaseSrc * src);
330 static gboolean gst_base_src_negotiate (GstBaseSrc * basesrc);
331 static gboolean gst_base_src_update_length (GstBaseSrc * src, guint64 offset,
335 gst_base_src_class_init (GstBaseSrcClass * klass)
337 GObjectClass *gobject_class;
338 GstElementClass *gstelement_class;
340 gobject_class = G_OBJECT_CLASS (klass);
341 gstelement_class = GST_ELEMENT_CLASS (klass);
343 GST_DEBUG_CATEGORY_INIT (gst_base_src_debug, "basesrc", 0, "basesrc element");
345 g_type_class_add_private (klass, sizeof (GstBaseSrcPrivate));
347 parent_class = g_type_class_peek_parent (klass);
349 gobject_class->finalize = gst_base_src_finalize;
350 gobject_class->set_property = gst_base_src_set_property;
351 gobject_class->get_property = gst_base_src_get_property;
353 g_object_class_install_property (gobject_class, PROP_BLOCKSIZE,
354 g_param_spec_uint ("blocksize", "Block size",
355 "Size in bytes to read per buffer (-1 = default)", 0, G_MAXUINT,
356 DEFAULT_BLOCKSIZE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
357 g_object_class_install_property (gobject_class, PROP_NUM_BUFFERS,
358 g_param_spec_int ("num-buffers", "num-buffers",
359 "Number of buffers to output before sending EOS (-1 = unlimited)",
360 -1, G_MAXINT, DEFAULT_NUM_BUFFERS, G_PARAM_READWRITE |
361 G_PARAM_STATIC_STRINGS));
362 g_object_class_install_property (gobject_class, PROP_TYPEFIND,
363 g_param_spec_boolean ("typefind", "Typefind",
364 "Run typefind before negotiating", DEFAULT_TYPEFIND,
365 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
366 g_object_class_install_property (gobject_class, PROP_DO_TIMESTAMP,
367 g_param_spec_boolean ("do-timestamp", "Do timestamp",
368 "Apply current stream time to buffers", DEFAULT_DO_TIMESTAMP,
369 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
371 gstelement_class->change_state =
372 GST_DEBUG_FUNCPTR (gst_base_src_change_state);
373 gstelement_class->send_event = GST_DEBUG_FUNCPTR (gst_base_src_send_event);
375 klass->get_caps = GST_DEBUG_FUNCPTR (gst_base_src_default_get_caps);
376 klass->negotiate = GST_DEBUG_FUNCPTR (gst_base_src_default_negotiate);
377 klass->fixate = GST_DEBUG_FUNCPTR (gst_base_src_default_fixate);
378 klass->prepare_seek_segment =
379 GST_DEBUG_FUNCPTR (gst_base_src_default_prepare_seek_segment);
380 klass->do_seek = GST_DEBUG_FUNCPTR (gst_base_src_default_do_seek);
381 klass->query = GST_DEBUG_FUNCPTR (gst_base_src_default_query);
382 klass->event = GST_DEBUG_FUNCPTR (gst_base_src_default_event);
383 klass->create = GST_DEBUG_FUNCPTR (gst_base_src_default_create);
384 klass->alloc = GST_DEBUG_FUNCPTR (gst_base_src_default_alloc);
386 /* Registering debug symbols for function pointers */
387 GST_DEBUG_REGISTER_FUNCPTR (gst_base_src_activate_push);
388 GST_DEBUG_REGISTER_FUNCPTR (gst_base_src_activate_pull);
389 GST_DEBUG_REGISTER_FUNCPTR (gst_base_src_event);
390 GST_DEBUG_REGISTER_FUNCPTR (gst_base_src_query);
391 GST_DEBUG_REGISTER_FUNCPTR (gst_base_src_getrange);
392 GST_DEBUG_REGISTER_FUNCPTR (gst_base_src_fixate);
396 gst_base_src_init (GstBaseSrc * basesrc, gpointer g_class)
399 GstPadTemplate *pad_template;
401 basesrc->priv = GST_BASE_SRC_GET_PRIVATE (basesrc);
403 basesrc->is_live = FALSE;
404 basesrc->live_lock = g_mutex_new ();
405 basesrc->live_cond = g_cond_new ();
406 basesrc->num_buffers = DEFAULT_NUM_BUFFERS;
407 basesrc->num_buffers_left = -1;
409 basesrc->can_activate_push = TRUE;
412 gst_element_class_get_pad_template (GST_ELEMENT_CLASS (g_class), "src");
413 g_return_if_fail (pad_template != NULL);
415 GST_DEBUG_OBJECT (basesrc, "creating src pad");
416 pad = gst_pad_new_from_template (pad_template, "src");
418 GST_DEBUG_OBJECT (basesrc, "setting functions on src pad");
419 gst_pad_set_activatepush_function (pad, gst_base_src_activate_push);
420 gst_pad_set_activatepull_function (pad, gst_base_src_activate_pull);
421 gst_pad_set_event_function (pad, gst_base_src_event);
422 gst_pad_set_query_function (pad, gst_base_src_query);
423 gst_pad_set_getrange_function (pad, gst_base_src_getrange);
425 /* hold pointer to pad */
426 basesrc->srcpad = pad;
427 GST_DEBUG_OBJECT (basesrc, "adding src pad");
428 gst_element_add_pad (GST_ELEMENT (basesrc), pad);
430 basesrc->blocksize = DEFAULT_BLOCKSIZE;
431 basesrc->clock_id = NULL;
432 /* we operate in BYTES by default */
433 gst_base_src_set_format (basesrc, GST_FORMAT_BYTES);
434 basesrc->typefind = DEFAULT_TYPEFIND;
435 basesrc->priv->do_timestamp = DEFAULT_DO_TIMESTAMP;
436 g_atomic_int_set (&basesrc->priv->have_events, FALSE);
438 GST_OBJECT_FLAG_UNSET (basesrc, GST_BASE_SRC_STARTED);
439 GST_OBJECT_FLAG_SET (basesrc, GST_ELEMENT_IS_SOURCE);
441 GST_DEBUG_OBJECT (basesrc, "init done");
445 gst_base_src_finalize (GObject * object)
450 basesrc = GST_BASE_SRC (object);
452 g_mutex_free (basesrc->live_lock);
453 g_cond_free (basesrc->live_cond);
455 event_p = &basesrc->pending_seek;
456 gst_event_replace (event_p, NULL);
458 if (basesrc->priv->pending_events) {
459 g_list_foreach (basesrc->priv->pending_events, (GFunc) gst_event_unref,
461 g_list_free (basesrc->priv->pending_events);
464 G_OBJECT_CLASS (parent_class)->finalize (object);
468 * gst_base_src_wait_playing:
471 * If the #GstBaseSrcClass.create() method performs its own synchronisation
472 * against the clock it must unblock when going from PLAYING to the PAUSED state
473 * and call this method before continuing to produce the remaining data.
475 * This function will block until a state change to PLAYING happens (in which
476 * case this function returns #GST_FLOW_OK) or the processing must be stopped due
477 * to a state change to READY or a FLUSH event (in which case this function
478 * returns #GST_FLOW_WRONG_STATE).
482 * Returns: #GST_FLOW_OK if @src is PLAYING and processing can
483 * continue. Any other return value should be returned from the create vmethod.
486 gst_base_src_wait_playing (GstBaseSrc * src)
488 g_return_val_if_fail (GST_IS_BASE_SRC (src), GST_FLOW_ERROR);
491 /* block until the state changes, or we get a flush, or something */
492 GST_DEBUG_OBJECT (src, "live source waiting for running state");
494 GST_DEBUG_OBJECT (src, "live source unlocked");
495 if (src->priv->flushing)
497 } while (G_UNLIKELY (!src->live_running));
504 GST_DEBUG_OBJECT (src, "we are flushing");
505 return GST_FLOW_WRONG_STATE;
510 * gst_base_src_set_live:
511 * @src: base source instance
512 * @live: new live-mode
514 * If the element listens to a live source, @live should
517 * A live source will not produce data in the PAUSED state and
518 * will therefore not be able to participate in the PREROLL phase
519 * of a pipeline. To signal this fact to the application and the
520 * pipeline, the state change return value of the live source will
521 * be GST_STATE_CHANGE_NO_PREROLL.
524 gst_base_src_set_live (GstBaseSrc * src, gboolean live)
526 g_return_if_fail (GST_IS_BASE_SRC (src));
528 GST_OBJECT_LOCK (src);
530 GST_OBJECT_UNLOCK (src);
534 * gst_base_src_is_live:
535 * @src: base source instance
537 * Check if an element is in live mode.
539 * Returns: %TRUE if element is in live mode.
542 gst_base_src_is_live (GstBaseSrc * src)
546 g_return_val_if_fail (GST_IS_BASE_SRC (src), FALSE);
548 GST_OBJECT_LOCK (src);
549 result = src->is_live;
550 GST_OBJECT_UNLOCK (src);
556 * gst_base_src_set_format:
557 * @src: base source instance
558 * @format: the format to use
560 * Sets the default format of the source. This will be the format used
561 * for sending NEW_SEGMENT events and for performing seeks.
563 * If a format of GST_FORMAT_BYTES is set, the element will be able to
564 * operate in pull mode if the #GstBaseSrcClass.is_seekable() returns TRUE.
566 * This function must only be called in states < %GST_STATE_PAUSED.
571 gst_base_src_set_format (GstBaseSrc * src, GstFormat format)
573 g_return_if_fail (GST_IS_BASE_SRC (src));
574 g_return_if_fail (GST_STATE (src) <= GST_STATE_READY);
576 GST_OBJECT_LOCK (src);
577 gst_segment_init (&src->segment, format);
578 GST_OBJECT_UNLOCK (src);
582 * gst_base_src_set_dynamic_size:
583 * @src: base source instance
584 * @dynamic: new dynamic size mode
586 * If not @dynamic, size is only updated when needed, such as when trying to
587 * read past current tracked size. Otherwise, size is checked for upon each
593 gst_base_src_set_dynamic_size (GstBaseSrc * src, gboolean dynamic)
595 g_return_if_fail (GST_IS_BASE_SRC (src));
597 g_atomic_int_set (&src->priv->dynamic_size, dynamic);
601 * gst_base_src_query_latency:
603 * @live: (out) (allow-none): if the source is live
604 * @min_latency: (out) (allow-none): the min latency of the source
605 * @max_latency: (out) (allow-none): the max latency of the source
607 * Query the source for the latency parameters. @live will be TRUE when @src is
608 * configured as a live source. @min_latency will be set to the difference
609 * between the running time and the timestamp of the first buffer.
610 * @max_latency is always the undefined value of -1.
612 * This function is mostly used by subclasses.
614 * Returns: TRUE if the query succeeded.
619 gst_base_src_query_latency (GstBaseSrc * src, gboolean * live,
620 GstClockTime * min_latency, GstClockTime * max_latency)
624 g_return_val_if_fail (GST_IS_BASE_SRC (src), FALSE);
626 GST_OBJECT_LOCK (src);
628 *live = src->is_live;
630 /* if we have a startup latency, report this one, else report 0. Subclasses
631 * are supposed to override the query function if they want something
633 if (src->priv->latency != -1)
634 min = src->priv->latency;
643 GST_LOG_OBJECT (src, "latency: live %d, min %" GST_TIME_FORMAT
644 ", max %" GST_TIME_FORMAT, src->is_live, GST_TIME_ARGS (min),
646 GST_OBJECT_UNLOCK (src);
652 * gst_base_src_set_blocksize:
654 * @blocksize: the new blocksize in bytes
656 * Set the number of bytes that @src will push out with each buffer. When
657 * @blocksize is set to -1, a default length will be used.
662 gst_base_src_set_blocksize (GstBaseSrc * src, guint blocksize)
664 g_return_if_fail (GST_IS_BASE_SRC (src));
666 GST_OBJECT_LOCK (src);
667 src->blocksize = blocksize;
668 GST_OBJECT_UNLOCK (src);
672 * gst_base_src_get_blocksize:
675 * Get the number of bytes that @src will push out with each buffer.
677 * Returns: the number of bytes pushed with each buffer.
682 gst_base_src_get_blocksize (GstBaseSrc * src)
686 g_return_val_if_fail (GST_IS_BASE_SRC (src), 0);
688 GST_OBJECT_LOCK (src);
689 res = src->blocksize;
690 GST_OBJECT_UNLOCK (src);
697 * gst_base_src_set_do_timestamp:
699 * @timestamp: enable or disable timestamping
701 * Configure @src to automatically timestamp outgoing buffers based on the
702 * current running_time of the pipeline. This property is mostly useful for live
708 gst_base_src_set_do_timestamp (GstBaseSrc * src, gboolean timestamp)
710 g_return_if_fail (GST_IS_BASE_SRC (src));
712 GST_OBJECT_LOCK (src);
713 src->priv->do_timestamp = timestamp;
714 GST_OBJECT_UNLOCK (src);
718 * gst_base_src_get_do_timestamp:
721 * Query if @src timestamps outgoing buffers based on the current running_time.
723 * Returns: %TRUE if the base class will automatically timestamp outgoing buffers.
728 gst_base_src_get_do_timestamp (GstBaseSrc * src)
732 g_return_val_if_fail (GST_IS_BASE_SRC (src), FALSE);
734 GST_OBJECT_LOCK (src);
735 res = src->priv->do_timestamp;
736 GST_OBJECT_UNLOCK (src);
742 * gst_base_src_new_seamless_segment:
744 * @start: The new start value for the segment
745 * @stop: Stop value for the new segment
746 * @position: The position value for the new segent
748 * Prepare a new seamless segment for emission downstream. This function must
749 * only be called by derived sub-classes, and only from the create() function,
750 * as the stream-lock needs to be held.
752 * The format for the new segment will be the current format of the source, as
753 * configured with gst_base_src_set_format()
755 * Returns: %TRUE if preparation of the seamless segment succeeded.
760 gst_base_src_new_seamless_segment (GstBaseSrc * src, gint64 start, gint64 stop,
765 GST_DEBUG_OBJECT (src,
766 "Starting new seamless segment. Start %" GST_TIME_FORMAT " stop %"
767 GST_TIME_FORMAT " position %" GST_TIME_FORMAT, GST_TIME_ARGS (start),
768 GST_TIME_ARGS (stop), GST_TIME_ARGS (position));
770 GST_OBJECT_LOCK (src);
772 src->segment.base = gst_segment_to_running_time (&src->segment,
773 src->segment.format, src->segment.position);
774 src->segment.start = start;
775 src->segment.stop = stop;
776 src->segment.position = position;
778 /* forward, we send data from position to stop */
779 src->priv->segment_pending = TRUE;
780 GST_OBJECT_UNLOCK (src);
782 src->priv->discont = TRUE;
789 * gst_base_src_set_caps:
790 * @src: a #GstBaseSrc
793 * Set new caps on the basesrc source pad.
795 * Returns: %TRUE if the caps could be set
798 gst_base_src_set_caps (GstBaseSrc * src, GstCaps * caps)
800 GstBaseSrcClass *bclass;
803 bclass = GST_BASE_SRC_GET_CLASS (src);
805 gst_pad_push_event (src->srcpad, gst_event_new_caps (caps));
807 if (bclass->set_caps)
808 res = bclass->set_caps (src, caps);
814 gst_base_src_default_get_caps (GstBaseSrc * bsrc, GstCaps * filter)
816 GstCaps *caps = NULL;
817 GstPadTemplate *pad_template;
818 GstBaseSrcClass *bclass;
820 bclass = GST_BASE_SRC_GET_CLASS (bsrc);
823 gst_element_class_get_pad_template (GST_ELEMENT_CLASS (bclass), "src");
825 if (pad_template != NULL) {
826 caps = gst_pad_template_get_caps (pad_template);
829 GstCaps *intersection;
832 gst_caps_intersect_full (filter, caps, GST_CAPS_INTERSECT_FIRST);
833 gst_caps_unref (caps);
841 gst_base_src_default_fixate (GstBaseSrc * bsrc, GstCaps * caps)
843 GST_DEBUG_OBJECT (bsrc, "using default caps fixate function");
844 gst_caps_fixate (caps);
848 gst_base_src_fixate (GstBaseSrc * bsrc, GstCaps * caps)
850 GstBaseSrcClass *bclass;
852 bclass = GST_BASE_SRC_GET_CLASS (bsrc);
855 bclass->fixate (bsrc, caps);
859 gst_base_src_default_query (GstBaseSrc * src, GstQuery * query)
863 switch (GST_QUERY_TYPE (query)) {
864 case GST_QUERY_POSITION:
868 gst_query_parse_position (query, &format, NULL);
870 GST_DEBUG_OBJECT (src, "position query in format %s",
871 gst_format_get_name (format));
874 case GST_FORMAT_PERCENT:
880 GST_OBJECT_LOCK (src);
881 position = src->segment.position;
882 duration = src->segment.duration;
883 GST_OBJECT_UNLOCK (src);
885 if (position != -1 && duration != -1) {
886 if (position < duration)
887 percent = gst_util_uint64_scale (GST_FORMAT_PERCENT_MAX, position,
890 percent = GST_FORMAT_PERCENT_MAX;
894 gst_query_set_position (query, GST_FORMAT_PERCENT, percent);
901 GstFormat seg_format;
903 GST_OBJECT_LOCK (src);
905 gst_segment_to_stream_time (&src->segment, src->segment.format,
906 src->segment.position);
907 seg_format = src->segment.format;
908 GST_OBJECT_UNLOCK (src);
910 if (position != -1) {
911 /* convert to requested format */
913 gst_pad_query_convert (src->srcpad, seg_format,
914 position, format, &position);
918 gst_query_set_position (query, format, position);
924 case GST_QUERY_DURATION:
928 gst_query_parse_duration (query, &format, NULL);
930 GST_DEBUG_OBJECT (src, "duration query in format %s",
931 gst_format_get_name (format));
934 case GST_FORMAT_PERCENT:
935 gst_query_set_duration (query, GST_FORMAT_PERCENT,
936 GST_FORMAT_PERCENT_MAX);
942 GstFormat seg_format;
945 /* may have to refresh duration */
946 if (g_atomic_int_get (&src->priv->dynamic_size))
947 gst_base_src_update_length (src, 0, &length);
949 /* this is the duration as configured by the subclass. */
950 GST_OBJECT_LOCK (src);
951 duration = src->segment.duration;
952 seg_format = src->segment.format;
953 GST_OBJECT_UNLOCK (src);
955 GST_LOG_OBJECT (src, "duration %" G_GINT64_FORMAT ", format %s",
956 duration, gst_format_get_name (seg_format));
958 if (duration != -1) {
959 /* convert to requested format, if this fails, we have a duration
960 * but we cannot answer the query, we must return FALSE. */
962 gst_pad_query_convert (src->srcpad, seg_format,
963 duration, format, &duration);
965 /* The subclass did not configure a duration, we assume that the
966 * media has an unknown duration then and we return TRUE to report
967 * this. Note that this is not the same as returning FALSE, which
968 * means that we cannot report the duration at all. */
971 gst_query_set_duration (query, format, duration);
978 case GST_QUERY_SEEKING:
980 GstFormat format, seg_format;
983 GST_OBJECT_LOCK (src);
984 duration = src->segment.duration;
985 seg_format = src->segment.format;
986 GST_OBJECT_UNLOCK (src);
988 gst_query_parse_seeking (query, &format, NULL, NULL, NULL);
989 if (format == seg_format) {
990 gst_query_set_seeking (query, seg_format,
991 gst_base_src_seekable (src), 0, duration);
994 /* FIXME 0.11: return TRUE + seekable=FALSE for SEEKING query here */
995 /* Don't reply to the query to make up for demuxers which don't
996 * handle the SEEKING query yet. Players like Totem will fall back
997 * to the duration when the SEEKING query isn't answered. */
1002 case GST_QUERY_SEGMENT:
1006 GST_OBJECT_LOCK (src);
1007 /* no end segment configured, current duration then */
1008 if ((stop = src->segment.stop) == -1)
1009 stop = src->segment.duration;
1010 start = src->segment.start;
1012 /* adjust to stream time */
1013 if (src->segment.time != -1) {
1014 start -= src->segment.time;
1016 stop -= src->segment.time;
1019 gst_query_set_segment (query, src->segment.rate, src->segment.format,
1021 GST_OBJECT_UNLOCK (src);
1026 case GST_QUERY_FORMATS:
1028 gst_query_set_formats (query, 3, GST_FORMAT_DEFAULT,
1029 GST_FORMAT_BYTES, GST_FORMAT_PERCENT);
1033 case GST_QUERY_CONVERT:
1035 GstFormat src_fmt, dest_fmt;
1036 gint64 src_val, dest_val;
1038 gst_query_parse_convert (query, &src_fmt, &src_val, &dest_fmt, &dest_val);
1040 /* we can only convert between equal formats... */
1041 if (src_fmt == dest_fmt) {
1047 gst_query_set_convert (query, src_fmt, src_val, dest_fmt, dest_val);
1050 case GST_QUERY_LATENCY:
1052 GstClockTime min, max;
1055 /* Subclasses should override and implement something useful */
1056 res = gst_base_src_query_latency (src, &live, &min, &max);
1058 GST_LOG_OBJECT (src, "report latency: live %d, min %" GST_TIME_FORMAT
1059 ", max %" GST_TIME_FORMAT, live, GST_TIME_ARGS (min),
1060 GST_TIME_ARGS (max));
1062 gst_query_set_latency (query, live, min, max);
1065 case GST_QUERY_JITTER:
1066 case GST_QUERY_RATE:
1069 case GST_QUERY_BUFFERING:
1071 GstFormat format, seg_format;
1072 gint64 start, stop, estimated;
1074 gst_query_parse_buffering_range (query, &format, NULL, NULL, NULL);
1076 GST_DEBUG_OBJECT (src, "buffering query in format %s",
1077 gst_format_get_name (format));
1079 GST_OBJECT_LOCK (src);
1080 if (src->random_access) {
1083 if (format == GST_FORMAT_PERCENT)
1084 stop = GST_FORMAT_PERCENT_MAX;
1086 stop = src->segment.duration;
1092 seg_format = src->segment.format;
1093 GST_OBJECT_UNLOCK (src);
1095 /* convert to required format. When the conversion fails, we can't answer
1096 * the query. When the value is unknown, we can don't perform conversion
1097 * but report TRUE. */
1098 if (format != GST_FORMAT_PERCENT && stop != -1) {
1099 res = gst_pad_query_convert (src->srcpad, seg_format,
1100 stop, format, &stop);
1104 if (res && format != GST_FORMAT_PERCENT && start != -1)
1105 res = gst_pad_query_convert (src->srcpad, seg_format,
1106 start, format, &start);
1108 gst_query_set_buffering_range (query, format, start, stop, estimated);
1111 case GST_QUERY_SCHEDULING:
1113 gboolean random_access;
1115 random_access = gst_base_src_is_random_access (src);
1117 /* we can operate in getrange mode if the native format is bytes
1118 * and we are seekable, this condition is set in the random_access
1119 * flag and is set in the _start() method. */
1120 gst_query_set_scheduling (query, GST_SCHEDULING_FLAG_SEEKABLE, 1, -1, 0);
1122 gst_query_add_scheduling_mode (query, GST_PAD_MODE_PULL);
1123 gst_query_add_scheduling_mode (query, GST_PAD_MODE_PUSH);
1128 case GST_QUERY_CAPS:
1130 GstBaseSrcClass *bclass;
1131 GstCaps *caps, *filter;
1133 bclass = GST_BASE_SRC_GET_CLASS (src);
1134 if (bclass->get_caps) {
1135 gst_query_parse_caps (query, &filter);
1136 caps = bclass->get_caps (src, filter);
1137 gst_query_set_caps_result (query, caps);
1138 gst_caps_unref (caps);
1148 GST_DEBUG_OBJECT (src, "query %s returns %d", GST_QUERY_TYPE_NAME (query),
1155 gst_base_src_query (GstPad * pad, GstObject * parent, GstQuery * query)
1158 GstBaseSrcClass *bclass;
1159 gboolean result = FALSE;
1161 src = GST_BASE_SRC (parent);
1162 bclass = GST_BASE_SRC_GET_CLASS (src);
1165 result = bclass->query (src, query);
1171 gst_base_src_default_do_seek (GstBaseSrc * src, GstSegment * segment)
1173 gboolean res = TRUE;
1175 /* update our offset if the start/stop position was updated */
1176 if (segment->format == GST_FORMAT_BYTES) {
1177 segment->time = segment->start;
1178 } else if (segment->start == 0) {
1179 /* seek to start, we can implement a default for this. */
1183 GST_INFO_OBJECT (src, "Can't do a default seek");
1190 gst_base_src_do_seek (GstBaseSrc * src, GstSegment * segment)
1192 GstBaseSrcClass *bclass;
1193 gboolean result = FALSE;
1195 bclass = GST_BASE_SRC_GET_CLASS (src);
1197 if (bclass->do_seek)
1198 result = bclass->do_seek (src, segment);
1203 #define SEEK_TYPE_IS_RELATIVE(t) (((t) != GST_SEEK_TYPE_NONE) && ((t) != GST_SEEK_TYPE_SET))
1206 gst_base_src_default_prepare_seek_segment (GstBaseSrc * src, GstEvent * event,
1207 GstSegment * segment)
1209 /* By default, we try one of 2 things:
1210 * - For absolute seek positions, convert the requested position to our
1211 * configured processing format and place it in the output segment \
1212 * - For relative seek positions, convert our current (input) values to the
1213 * seek format, adjust by the relative seek offset and then convert back to
1214 * the processing format
1216 GstSeekType cur_type, stop_type;
1219 GstFormat seek_format, dest_format;
1222 gboolean res = TRUE;
1224 gst_event_parse_seek (event, &rate, &seek_format, &flags,
1225 &cur_type, &cur, &stop_type, &stop);
1226 dest_format = segment->format;
1228 if (seek_format == dest_format) {
1229 gst_segment_do_seek (segment, rate, seek_format, flags,
1230 cur_type, cur, stop_type, stop, &update);
1234 if (cur_type != GST_SEEK_TYPE_NONE) {
1235 /* FIXME: Handle seek_cur & seek_end by converting the input segment vals */
1237 gst_pad_query_convert (src->srcpad, seek_format, cur, dest_format,
1239 cur_type = GST_SEEK_TYPE_SET;
1242 if (res && stop_type != GST_SEEK_TYPE_NONE) {
1243 /* FIXME: Handle seek_cur & seek_end by converting the input segment vals */
1245 gst_pad_query_convert (src->srcpad, seek_format, stop, dest_format,
1247 stop_type = GST_SEEK_TYPE_SET;
1250 /* And finally, configure our output segment in the desired format */
1251 gst_segment_do_seek (segment, rate, dest_format, flags, cur_type, cur,
1252 stop_type, stop, &update);
1261 GST_DEBUG_OBJECT (src, "undefined format given, seek aborted.");
1267 gst_base_src_prepare_seek_segment (GstBaseSrc * src, GstEvent * event,
1268 GstSegment * seeksegment)
1270 GstBaseSrcClass *bclass;
1271 gboolean result = FALSE;
1273 bclass = GST_BASE_SRC_GET_CLASS (src);
1275 if (bclass->prepare_seek_segment)
1276 result = bclass->prepare_seek_segment (src, event, seeksegment);
1281 static GstFlowReturn
1282 gst_base_src_default_alloc (GstBaseSrc * src, guint64 offset,
1283 guint size, GstBuffer ** buffer)
1286 GstBaseSrcPrivate *priv = src->priv;
1289 ret = gst_buffer_pool_acquire_buffer (priv->pool, buffer, NULL);
1290 } else if (size != -1) {
1291 *buffer = gst_buffer_new_allocate (priv->allocator, size, priv->alignment);
1292 if (G_UNLIKELY (*buffer == NULL))
1297 GST_WARNING_OBJECT (src, "Not trying to alloc %u bytes. Blocksize not set?",
1306 GST_ERROR_OBJECT (src, "Failed to allocate %u bytes", size);
1307 return GST_FLOW_ERROR;
1311 static GstFlowReturn
1312 gst_base_src_default_create (GstBaseSrc * src, guint64 offset,
1313 guint size, GstBuffer ** buffer)
1315 GstBaseSrcClass *bclass;
1318 bclass = GST_BASE_SRC_GET_CLASS (src);
1320 if (G_UNLIKELY (!bclass->alloc))
1322 if (G_UNLIKELY (!bclass->fill))
1325 ret = bclass->alloc (src, offset, size, buffer);
1326 if (G_UNLIKELY (ret != GST_FLOW_OK))
1329 if (G_LIKELY (size > 0)) {
1330 /* only call fill when there is a size */
1331 ret = bclass->fill (src, offset, size, *buffer);
1332 if (G_UNLIKELY (ret != GST_FLOW_OK))
1341 GST_DEBUG_OBJECT (src, "no fill or alloc function");
1342 return GST_FLOW_NOT_SUPPORTED;
1346 GST_DEBUG_OBJECT (src, "Failed to allocate buffer of %u bytes", size);
1351 GST_DEBUG_OBJECT (src, "fill returned %d (%s)", ret,
1352 gst_flow_get_name (ret));
1353 gst_buffer_unref (*buffer);
1358 /* this code implements the seeking. It is a good example
1359 * handling all cases.
1361 * A seek updates the currently configured segment.start
1362 * and segment.stop values based on the SEEK_TYPE. If the
1363 * segment.start value is updated, a seek to this new position
1364 * should be performed.
1366 * The seek can only be executed when we are not currently
1367 * streaming any data, to make sure that this is the case, we
1368 * acquire the STREAM_LOCK which is taken when we are in the
1369 * _loop() function or when a getrange() is called. Normally
1370 * we will not receive a seek if we are operating in pull mode
1371 * though. When we operate as a live source we might block on the live
1372 * cond, which does not release the STREAM_LOCK. Therefore we will try
1373 * to grab the LIVE_LOCK instead of the STREAM_LOCK to make sure it is
1374 * safe to perform the seek.
1376 * When we are in the loop() function, we might be in the middle
1377 * of pushing a buffer, which might block in a sink. To make sure
1378 * that the push gets unblocked we push out a FLUSH_START event.
1379 * Our loop function will get a WRONG_STATE return value from
1380 * the push and will pause, effectively releasing the STREAM_LOCK.
1382 * For a non-flushing seek, we pause the task, which might eventually
1383 * release the STREAM_LOCK. We say eventually because when the sink
1384 * blocks on the sample we might wait a very long time until the sink
1385 * unblocks the sample. In any case we acquire the STREAM_LOCK and
1386 * can continue the seek. A non-flushing seek is normally done in a
1387 * running pipeline to perform seamless playback, this means that the sink is
1388 * PLAYING and will return from its chain function.
1389 * In the case of a non-flushing seek we need to make sure that the
1390 * data we output after the seek is continuous with the previous data,
1391 * this is because a non-flushing seek does not reset the running-time
1392 * to 0. We do this by closing the currently running segment, ie. sending
1393 * a new_segment event with the stop position set to the last processed
1396 * After updating the segment.start/stop values, we prepare for
1397 * streaming again. We push out a FLUSH_STOP to make the peer pad
1398 * accept data again and we start our task again.
1400 * A segment seek posts a message on the bus saying that the playback
1401 * of the segment started. We store the segment flag internally because
1402 * when we reach the segment.stop we have to post a segment.done
1403 * instead of EOS when doing a segment seek.
1405 /* FIXME (0.11), we have the unlock gboolean here because most current
1406 * implementations (fdsrc, -base/gst/tcp/, ...) unconditionally unlock, even when
1407 * the streaming thread isn't running, resulting in bogus unlocks later when it
1408 * starts. This is fixed by adding unlock_stop, but we should still avoid unlocking
1409 * unnecessarily for backwards compatibility. Ergo, the unlock variable stays
1413 gst_base_src_perform_seek (GstBaseSrc * src, GstEvent * event, gboolean unlock)
1415 gboolean res = TRUE, tres;
1417 GstFormat seek_format, dest_format;
1419 GstSeekType cur_type, stop_type;
1421 gboolean flush, playing;
1423 gboolean relative_seek = FALSE;
1424 gboolean seekseg_configured = FALSE;
1425 GstSegment seeksegment;
1429 GST_DEBUG_OBJECT (src, "doing seek: %" GST_PTR_FORMAT, event);
1431 GST_OBJECT_LOCK (src);
1432 dest_format = src->segment.format;
1433 GST_OBJECT_UNLOCK (src);
1436 gst_event_parse_seek (event, &rate, &seek_format, &flags,
1437 &cur_type, &cur, &stop_type, &stop);
1439 relative_seek = SEEK_TYPE_IS_RELATIVE (cur_type) ||
1440 SEEK_TYPE_IS_RELATIVE (stop_type);
1442 if (dest_format != seek_format && !relative_seek) {
1443 /* If we have an ABSOLUTE position (SEEK_SET only), we can convert it
1444 * here before taking the stream lock, otherwise we must convert it later,
1445 * once we have the stream lock and can read the last configures segment
1446 * start and stop positions */
1447 gst_segment_init (&seeksegment, dest_format);
1449 if (!gst_base_src_prepare_seek_segment (src, event, &seeksegment))
1450 goto prepare_failed;
1452 seekseg_configured = TRUE;
1455 flush = flags & GST_SEEK_FLAG_FLUSH;
1456 seqnum = gst_event_get_seqnum (event);
1459 /* get next seqnum */
1460 seqnum = gst_util_seqnum_next ();
1463 /* send flush start */
1465 tevent = gst_event_new_flush_start ();
1466 gst_event_set_seqnum (tevent, seqnum);
1467 gst_pad_push_event (src->srcpad, tevent);
1469 gst_pad_pause_task (src->srcpad);
1471 /* unblock streaming thread. */
1472 gst_base_src_set_flushing (src, TRUE, FALSE, unlock, &playing);
1474 /* grab streaming lock, this should eventually be possible, either
1475 * because the task is paused, our streaming thread stopped
1476 * or because our peer is flushing. */
1477 GST_PAD_STREAM_LOCK (src->srcpad);
1478 if (G_UNLIKELY (src->priv->seqnum == seqnum)) {
1479 /* we have seen this event before, issue a warning for now */
1480 GST_WARNING_OBJECT (src, "duplicate event found %" G_GUINT32_FORMAT,
1483 src->priv->seqnum = seqnum;
1484 GST_DEBUG_OBJECT (src, "seek with seqnum %" G_GUINT32_FORMAT, seqnum);
1487 gst_base_src_set_flushing (src, FALSE, playing, unlock, NULL);
1489 /* If we configured the seeksegment above, don't overwrite it now. Otherwise
1490 * copy the current segment info into the temp segment that we can actually
1491 * attempt the seek with. We only update the real segment if the seek succeeds. */
1492 if (!seekseg_configured) {
1493 memcpy (&seeksegment, &src->segment, sizeof (GstSegment));
1495 /* now configure the final seek segment */
1497 if (seeksegment.format != seek_format) {
1498 /* OK, here's where we give the subclass a chance to convert the relative
1499 * seek into an absolute one in the processing format. We set up any
1500 * absolute seek above, before taking the stream lock. */
1501 if (!gst_base_src_prepare_seek_segment (src, event, &seeksegment)) {
1502 GST_DEBUG_OBJECT (src, "Preparing the seek failed after flushing. "
1507 /* The seek format matches our processing format, no need to ask the
1508 * the subclass to configure the segment. */
1509 gst_segment_do_seek (&seeksegment, rate, seek_format, flags,
1510 cur_type, cur, stop_type, stop, &update);
1513 /* Else, no seek event passed, so we're just (re)starting the
1518 GST_DEBUG_OBJECT (src, "segment configured from %" G_GINT64_FORMAT
1519 " to %" G_GINT64_FORMAT ", position %" G_GINT64_FORMAT,
1520 seeksegment.start, seeksegment.stop, seeksegment.position);
1522 /* do the seek, segment.position contains the new position. */
1523 res = gst_base_src_do_seek (src, &seeksegment);
1526 /* and prepare to continue streaming */
1528 tevent = gst_event_new_flush_stop (TRUE);
1529 gst_event_set_seqnum (tevent, seqnum);
1530 /* send flush stop, peer will accept data and events again. We
1531 * are not yet providing data as we still have the STREAM_LOCK. */
1532 gst_pad_push_event (src->srcpad, tevent);
1535 /* The subclass must have converted the segment to the processing format
1537 if (res && seeksegment.format != dest_format) {
1538 GST_DEBUG_OBJECT (src, "Subclass failed to prepare a seek segment "
1539 "in the correct format. Aborting seek.");
1543 /* if the seek was successful, we update our real segment and push
1544 * out the new segment. */
1546 GST_OBJECT_LOCK (src);
1547 memcpy (&src->segment, &seeksegment, sizeof (GstSegment));
1548 GST_OBJECT_UNLOCK (src);
1550 if (seeksegment.flags & GST_SEEK_FLAG_SEGMENT) {
1551 GstMessage *message;
1553 message = gst_message_new_segment_start (GST_OBJECT (src),
1554 seeksegment.format, seeksegment.position);
1555 gst_message_set_seqnum (message, seqnum);
1557 gst_element_post_message (GST_ELEMENT (src), message);
1560 /* for deriving a stop position for the playback segment from the seek
1561 * segment, we must take the duration when the stop is not set */
1562 if ((stop = seeksegment.stop) == -1)
1563 stop = seeksegment.duration;
1565 src->priv->segment_pending = TRUE;
1568 src->priv->discont = TRUE;
1569 src->running = TRUE;
1570 /* and restart the task in case it got paused explicitly or by
1571 * the FLUSH_START event we pushed out. */
1572 tres = gst_pad_start_task (src->srcpad, (GstTaskFunction) gst_base_src_loop,
1577 /* and release the lock again so we can continue streaming */
1578 GST_PAD_STREAM_UNLOCK (src->srcpad);
1584 GST_DEBUG_OBJECT (src, "Preparing the seek failed before flushing. "
1589 /* all events send to this element directly. This is mainly done from the
1593 gst_base_src_send_event (GstElement * element, GstEvent * event)
1596 gboolean result = FALSE;
1598 src = GST_BASE_SRC (element);
1600 GST_DEBUG_OBJECT (src, "handling event %p %" GST_PTR_FORMAT, event, event);
1602 switch (GST_EVENT_TYPE (event)) {
1603 /* bidirectional events */
1604 case GST_EVENT_FLUSH_START:
1605 case GST_EVENT_FLUSH_STOP:
1606 /* sending random flushes downstream can break stuff,
1607 * especially sync since all segment info will get flushed */
1610 /* downstream serialized events */
1613 GstBaseSrcClass *bclass;
1615 bclass = GST_BASE_SRC_GET_CLASS (src);
1617 /* queue EOS and make sure the task or pull function performs the EOS
1620 * We have two possibilities:
1622 * - Before we are to enter the _create function, we check the pending_eos
1623 * first and do EOS instead of entering it.
1624 * - If we are in the _create function or we did not manage to set the
1625 * flag fast enough and we are about to enter the _create function,
1626 * we unlock it so that we exit with WRONG_STATE immediately. We then
1627 * check the EOS flag and do the EOS logic.
1629 g_atomic_int_set (&src->priv->pending_eos, TRUE);
1630 GST_DEBUG_OBJECT (src, "EOS marked, calling unlock");
1633 /* unlock the _create function so that we can check the pending_eos flag
1634 * and we can do EOS. This will eventually release the LIVE_LOCK again so
1635 * that we can grab it and stop the unlock again. We don't take the stream
1636 * lock so that this operation is guaranteed to never block. */
1637 gst_base_src_activate_pool (src, FALSE);
1639 bclass->unlock (src);
1641 GST_DEBUG_OBJECT (src, "unlock called, waiting for LIVE_LOCK");
1643 GST_LIVE_LOCK (src);
1644 GST_DEBUG_OBJECT (src, "LIVE_LOCK acquired, calling unlock_stop");
1645 /* now stop the unlock of the streaming thread again. Grabbing the live
1646 * lock is enough because that protects the create function. */
1647 if (bclass->unlock_stop)
1648 bclass->unlock_stop (src);
1649 gst_base_src_activate_pool (src, TRUE);
1650 GST_LIVE_UNLOCK (src);
1655 case GST_EVENT_SEGMENT:
1656 /* sending random SEGMENT downstream can break sync. */
1659 case GST_EVENT_CUSTOM_DOWNSTREAM:
1660 case GST_EVENT_CUSTOM_BOTH:
1661 /* Insert TAG, CUSTOM_DOWNSTREAM, CUSTOM_BOTH in the dataflow */
1662 GST_OBJECT_LOCK (src);
1663 src->priv->pending_events =
1664 g_list_append (src->priv->pending_events, event);
1665 g_atomic_int_set (&src->priv->have_events, TRUE);
1666 GST_OBJECT_UNLOCK (src);
1670 case GST_EVENT_BUFFERSIZE:
1671 /* does not seem to make much sense currently */
1674 /* upstream events */
1676 /* elements should override send_event and do something */
1678 case GST_EVENT_SEEK:
1682 GST_OBJECT_LOCK (src->srcpad);
1683 if (GST_PAD_MODE (src->srcpad) == GST_PAD_MODE_PULL)
1685 started = GST_PAD_MODE (src->srcpad) == GST_PAD_MODE_PUSH;
1686 GST_OBJECT_UNLOCK (src->srcpad);
1689 GST_DEBUG_OBJECT (src, "performing seek");
1690 /* when we are running in push mode, we can execute the
1691 * seek right now, we need to unlock. */
1692 result = gst_base_src_perform_seek (src, event, TRUE);
1696 /* else we store the event and execute the seek when we
1698 GST_OBJECT_LOCK (src);
1699 GST_DEBUG_OBJECT (src, "queueing seek");
1700 event_p = &src->pending_seek;
1701 gst_event_replace ((GstEvent **) event_p, event);
1702 GST_OBJECT_UNLOCK (src);
1703 /* assume the seek will work */
1708 case GST_EVENT_NAVIGATION:
1709 /* could make sense for elements that do something with navigation events
1710 * but then they would need to override the send_event function */
1712 case GST_EVENT_LATENCY:
1713 /* does not seem to make sense currently */
1717 case GST_EVENT_CUSTOM_UPSTREAM:
1718 /* override send_event if you want this */
1720 case GST_EVENT_CUSTOM_DOWNSTREAM_OOB:
1721 case GST_EVENT_CUSTOM_BOTH_OOB:
1722 /* insert a random custom event into the pipeline */
1723 GST_DEBUG_OBJECT (src, "pushing custom OOB event downstream");
1724 result = gst_pad_push_event (src->srcpad, event);
1725 /* we gave away the ref to the event in the push */
1732 /* if we still have a ref to the event, unref it now */
1734 gst_event_unref (event);
1741 GST_DEBUG_OBJECT (src, "cannot perform seek when operating in pull mode");
1742 GST_OBJECT_UNLOCK (src->srcpad);
1749 gst_base_src_seekable (GstBaseSrc * src)
1751 GstBaseSrcClass *bclass;
1752 bclass = GST_BASE_SRC_GET_CLASS (src);
1753 if (bclass->is_seekable)
1754 return bclass->is_seekable (src);
1760 gst_base_src_update_qos (GstBaseSrc * src,
1761 gdouble proportion, GstClockTimeDiff diff, GstClockTime timestamp)
1763 GST_CAT_DEBUG_OBJECT (GST_CAT_QOS, src,
1764 "qos: proportion: %lf, diff %" G_GINT64_FORMAT ", timestamp %"
1765 GST_TIME_FORMAT, proportion, diff, GST_TIME_ARGS (timestamp));
1767 GST_OBJECT_LOCK (src);
1768 src->priv->proportion = proportion;
1769 src->priv->earliest_time = timestamp + diff;
1770 GST_OBJECT_UNLOCK (src);
1775 gst_base_src_default_event (GstBaseSrc * src, GstEvent * event)
1779 GST_DEBUG_OBJECT (src, "handle event %" GST_PTR_FORMAT, event);
1781 switch (GST_EVENT_TYPE (event)) {
1782 case GST_EVENT_SEEK:
1783 /* is normally called when in push mode */
1784 if (!gst_base_src_seekable (src))
1787 result = gst_base_src_perform_seek (src, event, TRUE);
1789 case GST_EVENT_FLUSH_START:
1790 /* cancel any blocking getrange, is normally called
1791 * when in pull mode. */
1792 result = gst_base_src_set_flushing (src, TRUE, FALSE, TRUE, NULL);
1794 case GST_EVENT_FLUSH_STOP:
1795 result = gst_base_src_set_flushing (src, FALSE, TRUE, TRUE, NULL);
1800 GstClockTimeDiff diff;
1801 GstClockTime timestamp;
1803 gst_event_parse_qos (event, NULL, &proportion, &diff, ×tamp);
1804 gst_base_src_update_qos (src, proportion, diff, timestamp);
1817 GST_DEBUG_OBJECT (src, "is not seekable");
1823 gst_base_src_event (GstPad * pad, GstObject * parent, GstEvent * event)
1826 GstBaseSrcClass *bclass;
1827 gboolean result = FALSE;
1829 src = GST_BASE_SRC (parent);
1830 bclass = GST_BASE_SRC_GET_CLASS (src);
1832 if (bclass->event) {
1833 if (!(result = bclass->event (src, event)))
1834 goto subclass_failed;
1838 gst_event_unref (event);
1845 GST_DEBUG_OBJECT (src, "subclass refused event");
1851 gst_base_src_set_property (GObject * object, guint prop_id,
1852 const GValue * value, GParamSpec * pspec)
1856 src = GST_BASE_SRC (object);
1859 case PROP_BLOCKSIZE:
1860 gst_base_src_set_blocksize (src, g_value_get_uint (value));
1862 case PROP_NUM_BUFFERS:
1863 src->num_buffers = g_value_get_int (value);
1866 src->typefind = g_value_get_boolean (value);
1868 case PROP_DO_TIMESTAMP:
1869 gst_base_src_set_do_timestamp (src, g_value_get_boolean (value));
1872 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
1878 gst_base_src_get_property (GObject * object, guint prop_id, GValue * value,
1883 src = GST_BASE_SRC (object);
1886 case PROP_BLOCKSIZE:
1887 g_value_set_uint (value, gst_base_src_get_blocksize (src));
1889 case PROP_NUM_BUFFERS:
1890 g_value_set_int (value, src->num_buffers);
1893 g_value_set_boolean (value, src->typefind);
1895 case PROP_DO_TIMESTAMP:
1896 g_value_set_boolean (value, gst_base_src_get_do_timestamp (src));
1899 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
1904 /* with STREAM_LOCK and LOCK */
1905 static GstClockReturn
1906 gst_base_src_wait (GstBaseSrc * basesrc, GstClock * clock, GstClockTime time)
1911 id = gst_clock_new_single_shot_id (clock, time);
1913 basesrc->clock_id = id;
1914 /* release the live lock while waiting */
1915 GST_LIVE_UNLOCK (basesrc);
1917 ret = gst_clock_id_wait (id, NULL);
1919 GST_LIVE_LOCK (basesrc);
1920 gst_clock_id_unref (id);
1921 basesrc->clock_id = NULL;
1926 /* perform synchronisation on a buffer.
1929 static GstClockReturn
1930 gst_base_src_do_sync (GstBaseSrc * basesrc, GstBuffer * buffer)
1932 GstClockReturn result;
1933 GstClockTime start, end;
1934 GstBaseSrcClass *bclass;
1935 GstClockTime base_time;
1937 GstClockTime now = GST_CLOCK_TIME_NONE, timestamp;
1938 gboolean do_timestamp, first, pseudo_live;
1940 bclass = GST_BASE_SRC_GET_CLASS (basesrc);
1943 if (bclass->get_times)
1944 bclass->get_times (basesrc, buffer, &start, &end);
1946 /* get buffer timestamp */
1947 timestamp = GST_BUFFER_TIMESTAMP (buffer);
1949 /* grab the lock to prepare for clocking and calculate the startup
1951 GST_OBJECT_LOCK (basesrc);
1953 /* if we are asked to sync against the clock we are a pseudo live element */
1954 pseudo_live = (start != -1 && basesrc->is_live);
1955 /* check for the first buffer */
1956 first = (basesrc->priv->latency == -1);
1958 if (timestamp != -1 && pseudo_live) {
1959 GstClockTime latency;
1961 /* we have a timestamp and a sync time, latency is the diff */
1962 if (timestamp <= start)
1963 latency = start - timestamp;
1968 GST_DEBUG_OBJECT (basesrc, "pseudo_live with latency %" GST_TIME_FORMAT,
1969 GST_TIME_ARGS (latency));
1970 /* first time we calculate latency, just configure */
1971 basesrc->priv->latency = latency;
1973 if (basesrc->priv->latency != latency) {
1974 /* we have a new latency, FIXME post latency message */
1975 basesrc->priv->latency = latency;
1976 GST_DEBUG_OBJECT (basesrc, "latency changed to %" GST_TIME_FORMAT,
1977 GST_TIME_ARGS (latency));
1981 GST_DEBUG_OBJECT (basesrc, "no latency needed, live %d, sync %d",
1982 basesrc->is_live, start != -1);
1983 basesrc->priv->latency = 0;
1986 /* get clock, if no clock, we can't sync or do timestamps */
1987 if ((clock = GST_ELEMENT_CLOCK (basesrc)) == NULL)
1990 base_time = GST_ELEMENT_CAST (basesrc)->base_time;
1992 do_timestamp = basesrc->priv->do_timestamp;
1994 /* first buffer, calculate the timestamp offset */
1996 GstClockTime running_time;
1998 now = gst_clock_get_time (clock);
1999 running_time = now - base_time;
2001 GST_LOG_OBJECT (basesrc,
2002 "startup timestamp: %" GST_TIME_FORMAT ", running_time %"
2003 GST_TIME_FORMAT, GST_TIME_ARGS (timestamp),
2004 GST_TIME_ARGS (running_time));
2006 if (pseudo_live && timestamp != -1) {
2007 /* live source and we need to sync, add startup latency to all timestamps
2008 * to get the real running_time. Live sources should always timestamp
2009 * according to the current running time. */
2010 basesrc->priv->ts_offset = GST_CLOCK_DIFF (timestamp, running_time);
2012 GST_LOG_OBJECT (basesrc, "live with sync, ts_offset %" GST_TIME_FORMAT,
2013 GST_TIME_ARGS (basesrc->priv->ts_offset));
2015 basesrc->priv->ts_offset = 0;
2016 GST_LOG_OBJECT (basesrc, "no timestamp offset needed");
2019 if (!GST_CLOCK_TIME_IS_VALID (timestamp)) {
2021 timestamp = running_time;
2025 GST_BUFFER_TIMESTAMP (buffer) = timestamp;
2027 GST_LOG_OBJECT (basesrc, "created timestamp: %" GST_TIME_FORMAT,
2028 GST_TIME_ARGS (timestamp));
2031 /* add the timestamp offset we need for sync */
2032 timestamp += basesrc->priv->ts_offset;
2034 /* not the first buffer, the timestamp is the diff between the clock and
2036 if (do_timestamp && !GST_CLOCK_TIME_IS_VALID (timestamp)) {
2037 now = gst_clock_get_time (clock);
2039 GST_BUFFER_TIMESTAMP (buffer) = now - base_time;
2041 GST_LOG_OBJECT (basesrc, "created timestamp: %" GST_TIME_FORMAT,
2042 GST_TIME_ARGS (now - base_time));
2046 /* if we don't have a buffer timestamp, we don't sync */
2047 if (!GST_CLOCK_TIME_IS_VALID (start))
2050 if (basesrc->is_live && GST_CLOCK_TIME_IS_VALID (timestamp)) {
2051 /* for pseudo live sources, add our ts_offset to the timestamp */
2052 GST_BUFFER_TIMESTAMP (buffer) += basesrc->priv->ts_offset;
2053 start += basesrc->priv->ts_offset;
2056 GST_LOG_OBJECT (basesrc,
2057 "waiting for clock, base time %" GST_TIME_FORMAT
2058 ", stream_start %" GST_TIME_FORMAT,
2059 GST_TIME_ARGS (base_time), GST_TIME_ARGS (start));
2060 GST_OBJECT_UNLOCK (basesrc);
2062 result = gst_base_src_wait (basesrc, clock, start + base_time);
2064 GST_LOG_OBJECT (basesrc, "clock entry done: %d", result);
2071 GST_DEBUG_OBJECT (basesrc, "we have no clock");
2072 GST_OBJECT_UNLOCK (basesrc);
2073 return GST_CLOCK_OK;
2077 GST_DEBUG_OBJECT (basesrc, "no sync needed");
2078 GST_OBJECT_UNLOCK (basesrc);
2079 return GST_CLOCK_OK;
2083 /* Called with STREAM_LOCK and LIVE_LOCK */
2085 gst_base_src_update_length (GstBaseSrc * src, guint64 offset, guint * length)
2087 guint64 size, maxsize;
2088 GstBaseSrcClass *bclass;
2093 bclass = GST_BASE_SRC_GET_CLASS (src);
2095 format = src->segment.format;
2096 stop = src->segment.stop;
2097 /* get total file size */
2098 size = src->segment.duration;
2100 /* only operate if we are working with bytes */
2101 if (format != GST_FORMAT_BYTES)
2104 /* the max amount of bytes to read is the total size or
2105 * up to the segment.stop if present. */
2107 maxsize = MIN (size, stop);
2111 GST_DEBUG_OBJECT (src,
2112 "reading offset %" G_GUINT64_FORMAT ", length %u, size %" G_GINT64_FORMAT
2113 ", segment.stop %" G_GINT64_FORMAT ", maxsize %" G_GINT64_FORMAT, offset,
2114 *length, size, stop, maxsize);
2116 dynamic = g_atomic_int_get (&src->priv->dynamic_size);
2117 GST_DEBUG_OBJECT (src, "dynamic size: %d", dynamic);
2119 /* check size if we have one */
2120 if (maxsize != -1) {
2121 /* if we run past the end, check if the file became bigger and
2123 if (G_UNLIKELY (offset + *length >= maxsize || dynamic)) {
2124 /* see if length of the file changed */
2125 if (bclass->get_size)
2126 if (!bclass->get_size (src, &size))
2129 /* make sure we don't exceed the configured segment stop
2132 maxsize = MIN (size, stop);
2136 /* if we are at or past the end, EOS */
2137 if (G_UNLIKELY (offset >= maxsize))
2138 goto unexpected_length;
2140 /* else we can clip to the end */
2141 if (G_UNLIKELY (offset + *length >= maxsize))
2142 *length = maxsize - offset;
2147 /* keep track of current duration.
2148 * segment is in bytes, we checked that above. */
2149 GST_OBJECT_LOCK (src);
2150 src->segment.duration = size;
2151 GST_OBJECT_UNLOCK (src);
2162 /* must be called with LIVE_LOCK */
2163 static GstFlowReturn
2164 gst_base_src_get_range (GstBaseSrc * src, guint64 offset, guint length,
2168 GstBaseSrcClass *bclass;
2169 GstClockReturn status;
2171 bclass = GST_BASE_SRC_GET_CLASS (src);
2175 if (G_UNLIKELY (!src->live_running)) {
2176 ret = gst_base_src_wait_playing (src);
2177 if (ret != GST_FLOW_OK)
2182 if (G_UNLIKELY (!GST_OBJECT_FLAG_IS_SET (src, GST_BASE_SRC_STARTED)))
2185 if (G_UNLIKELY (!bclass->create))
2188 if (G_UNLIKELY (!gst_base_src_update_length (src, offset, &length)))
2189 goto unexpected_length;
2191 /* track position */
2192 GST_OBJECT_LOCK (src);
2193 if (src->segment.format == GST_FORMAT_BYTES)
2194 src->segment.position = offset;
2195 GST_OBJECT_UNLOCK (src);
2197 /* normally we don't count buffers */
2198 if (G_UNLIKELY (src->num_buffers_left >= 0)) {
2199 if (src->num_buffers_left == 0)
2200 goto reached_num_buffers;
2202 src->num_buffers_left--;
2205 /* don't enter the create function if a pending EOS event was set. For the
2206 * logic of the pending_eos, check the event function of this class. */
2207 if (G_UNLIKELY (g_atomic_int_get (&src->priv->pending_eos)))
2210 GST_DEBUG_OBJECT (src,
2211 "calling create offset %" G_GUINT64_FORMAT " length %u, time %"
2212 G_GINT64_FORMAT, offset, length, src->segment.time);
2214 ret = bclass->create (src, offset, length, buf);
2216 /* The create function could be unlocked because we have a pending EOS. It's
2217 * possible that we have a valid buffer from create that we need to
2218 * discard when the create function returned _OK. */
2219 if (G_UNLIKELY (g_atomic_int_get (&src->priv->pending_eos))) {
2220 if (ret == GST_FLOW_OK) {
2221 gst_buffer_unref (*buf);
2227 if (G_UNLIKELY (ret != GST_FLOW_OK))
2230 /* no timestamp set and we are at offset 0, we can timestamp with 0 */
2231 if (offset == 0 && src->segment.time == 0
2232 && GST_BUFFER_TIMESTAMP (*buf) == -1 && !src->is_live) {
2233 *buf = gst_buffer_make_writable (*buf);
2234 GST_BUFFER_TIMESTAMP (*buf) = 0;
2237 /* now sync before pushing the buffer */
2238 status = gst_base_src_do_sync (src, *buf);
2240 /* waiting for the clock could have made us flushing */
2241 if (G_UNLIKELY (src->priv->flushing))
2245 case GST_CLOCK_EARLY:
2246 /* the buffer is too late. We currently don't drop the buffer. */
2247 GST_DEBUG_OBJECT (src, "buffer too late!, returning anyway");
2250 /* buffer synchronised properly */
2251 GST_DEBUG_OBJECT (src, "buffer ok");
2253 case GST_CLOCK_UNSCHEDULED:
2254 /* this case is triggered when we were waiting for the clock and
2255 * it got unlocked because we did a state change. In any case, get rid of
2257 gst_buffer_unref (*buf);
2259 if (!src->live_running) {
2260 /* We return WRONG_STATE when we are not running to stop the dataflow also
2261 * get rid of the produced buffer. */
2262 GST_DEBUG_OBJECT (src,
2263 "clock was unscheduled (%d), returning WRONG_STATE", status);
2264 ret = GST_FLOW_WRONG_STATE;
2266 /* If we are running when this happens, we quickly switched between
2267 * pause and playing. We try to produce a new buffer */
2268 GST_DEBUG_OBJECT (src,
2269 "clock was unscheduled (%d), but we are running", status);
2274 /* all other result values are unexpected and errors */
2275 GST_ELEMENT_ERROR (src, CORE, CLOCK,
2276 (_("Internal clock error.")),
2277 ("clock returned unexpected return value %d", status));
2278 gst_buffer_unref (*buf);
2280 ret = GST_FLOW_ERROR;
2288 GST_DEBUG_OBJECT (src, "wait_playing returned %d (%s)", ret,
2289 gst_flow_get_name (ret));
2294 GST_DEBUG_OBJECT (src, "create returned %d (%s)", ret,
2295 gst_flow_get_name (ret));
2300 GST_DEBUG_OBJECT (src, "getrange but not started");
2301 return GST_FLOW_WRONG_STATE;
2305 GST_DEBUG_OBJECT (src, "no create function");
2306 return GST_FLOW_NOT_SUPPORTED;
2310 GST_DEBUG_OBJECT (src, "unexpected length %u (offset=%" G_GUINT64_FORMAT
2311 ", size=%" G_GINT64_FORMAT ")", length, offset, src->segment.duration);
2312 return GST_FLOW_EOS;
2314 reached_num_buffers:
2316 GST_DEBUG_OBJECT (src, "sent all buffers");
2317 return GST_FLOW_EOS;
2321 GST_DEBUG_OBJECT (src, "we are flushing");
2322 gst_buffer_unref (*buf);
2324 return GST_FLOW_WRONG_STATE;
2328 GST_DEBUG_OBJECT (src, "we are EOS");
2329 return GST_FLOW_EOS;
2333 static GstFlowReturn
2334 gst_base_src_getrange (GstPad * pad, GstObject * parent, guint64 offset,
2335 guint length, GstBuffer ** buf)
2340 src = GST_BASE_SRC_CAST (parent);
2342 GST_LIVE_LOCK (src);
2343 if (G_UNLIKELY (src->priv->flushing))
2346 res = gst_base_src_get_range (src, offset, length, buf);
2349 GST_LIVE_UNLOCK (src);
2356 GST_DEBUG_OBJECT (src, "we are flushing");
2357 res = GST_FLOW_WRONG_STATE;
2363 gst_base_src_is_random_access (GstBaseSrc * src)
2365 /* we need to start the basesrc to check random access */
2366 if (!GST_OBJECT_FLAG_IS_SET (src, GST_BASE_SRC_STARTED)) {
2367 GST_LOG_OBJECT (src, "doing start/stop to check get_range support");
2368 if (G_LIKELY (gst_base_src_start (src)))
2369 gst_base_src_stop (src);
2372 return src->random_access;
2376 gst_base_src_loop (GstPad * pad)
2379 GstBuffer *buf = NULL;
2384 GList *pending_events = NULL, *tmp;
2388 src = GST_BASE_SRC (GST_OBJECT_PARENT (pad));
2390 /* check if we need to renegotiate */
2391 if (gst_pad_check_reconfigure (pad)) {
2392 if (!gst_base_src_negotiate (src))
2393 GST_DEBUG_OBJECT (src, "Failed to renegotiate");
2396 GST_LIVE_LOCK (src);
2398 if (G_UNLIKELY (src->priv->flushing))
2401 blocksize = src->blocksize;
2403 /* if we operate in bytes, we can calculate an offset */
2404 if (src->segment.format == GST_FORMAT_BYTES) {
2405 position = src->segment.position;
2406 /* for negative rates, start with subtracting the blocksize */
2407 if (src->segment.rate < 0.0) {
2408 /* we cannot go below segment.start */
2409 if (position > src->segment.start + blocksize)
2410 position -= blocksize;
2412 /* last block, remainder up to segment.start */
2413 blocksize = position - src->segment.start;
2414 position = src->segment.start;
2420 GST_LOG_OBJECT (src, "next_ts %" GST_TIME_FORMAT " size %u",
2421 GST_TIME_ARGS (position), blocksize);
2423 ret = gst_base_src_get_range (src, position, blocksize, &buf);
2424 if (G_UNLIKELY (ret != GST_FLOW_OK)) {
2425 GST_INFO_OBJECT (src, "pausing after gst_base_src_get_range() = %s",
2426 gst_flow_get_name (ret));
2427 GST_LIVE_UNLOCK (src);
2430 /* this should not happen */
2431 if (G_UNLIKELY (buf == NULL))
2434 /* push events to close/start our segment before we push the buffer. */
2435 if (G_UNLIKELY (src->priv->segment_pending)) {
2436 gst_pad_push_event (pad, gst_event_new_segment (&src->segment));
2437 src->priv->segment_pending = FALSE;
2440 if (g_atomic_int_get (&src->priv->have_events)) {
2441 GST_OBJECT_LOCK (src);
2442 /* take the events */
2443 pending_events = src->priv->pending_events;
2444 src->priv->pending_events = NULL;
2445 g_atomic_int_set (&src->priv->have_events, FALSE);
2446 GST_OBJECT_UNLOCK (src);
2449 /* Push out pending events if any */
2450 if (G_UNLIKELY (pending_events != NULL)) {
2451 for (tmp = pending_events; tmp; tmp = g_list_next (tmp)) {
2452 GstEvent *ev = (GstEvent *) tmp->data;
2453 gst_pad_push_event (pad, ev);
2455 g_list_free (pending_events);
2458 /* figure out the new position */
2459 switch (src->segment.format) {
2460 case GST_FORMAT_BYTES:
2462 guint bufsize = gst_buffer_get_size (buf);
2464 /* we subtracted above for negative rates */
2465 if (src->segment.rate >= 0.0)
2466 position += bufsize;
2469 case GST_FORMAT_TIME:
2471 GstClockTime start, duration;
2473 start = GST_BUFFER_TIMESTAMP (buf);
2474 duration = GST_BUFFER_DURATION (buf);
2476 if (GST_CLOCK_TIME_IS_VALID (start))
2479 position = src->segment.position;
2481 if (GST_CLOCK_TIME_IS_VALID (duration)) {
2482 if (src->segment.rate >= 0.0)
2483 position += duration;
2484 else if (position > duration)
2485 position -= duration;
2491 case GST_FORMAT_DEFAULT:
2492 if (src->segment.rate >= 0.0)
2493 position = GST_BUFFER_OFFSET_END (buf);
2495 position = GST_BUFFER_OFFSET (buf);
2501 if (position != -1) {
2502 if (src->segment.rate >= 0.0) {
2503 /* positive rate, check if we reached the stop */
2504 if (src->segment.stop != -1) {
2505 if (position >= src->segment.stop) {
2507 position = src->segment.stop;
2511 /* negative rate, check if we reached the start. start is always set to
2512 * something different from -1 */
2513 if (position <= src->segment.start) {
2515 position = src->segment.start;
2517 /* when going reverse, all buffers are DISCONT */
2518 src->priv->discont = TRUE;
2520 GST_OBJECT_LOCK (src);
2521 src->segment.position = position;
2522 GST_OBJECT_UNLOCK (src);
2525 if (G_UNLIKELY (src->priv->discont)) {
2526 buf = gst_buffer_make_writable (buf);
2527 GST_BUFFER_FLAG_SET (buf, GST_BUFFER_FLAG_DISCONT);
2528 src->priv->discont = FALSE;
2530 GST_LIVE_UNLOCK (src);
2532 ret = gst_pad_push (pad, buf);
2533 if (G_UNLIKELY (ret != GST_FLOW_OK)) {
2534 GST_INFO_OBJECT (src, "pausing after gst_pad_push() = %s",
2535 gst_flow_get_name (ret));
2539 if (G_UNLIKELY (eos)) {
2540 GST_INFO_OBJECT (src, "pausing after end of segment");
2551 GST_DEBUG_OBJECT (src, "we are flushing");
2552 GST_LIVE_UNLOCK (src);
2553 ret = GST_FLOW_WRONG_STATE;
2558 const gchar *reason = gst_flow_get_name (ret);
2561 GST_DEBUG_OBJECT (src, "pausing task, reason %s", reason);
2562 src->running = FALSE;
2563 gst_pad_pause_task (pad);
2564 if (ret == GST_FLOW_EOS) {
2565 gboolean flag_segment;
2569 /* perform EOS logic */
2570 flag_segment = (src->segment.flags & GST_SEEK_FLAG_SEGMENT) != 0;
2571 format = src->segment.format;
2572 position = src->segment.position;
2575 GstMessage *message;
2577 message = gst_message_new_segment_done (GST_OBJECT_CAST (src),
2579 gst_message_set_seqnum (message, src->priv->seqnum);
2580 gst_element_post_message (GST_ELEMENT_CAST (src), message);
2582 event = gst_event_new_eos ();
2583 gst_event_set_seqnum (event, src->priv->seqnum);
2584 gst_pad_push_event (pad, event);
2586 } else if (ret == GST_FLOW_NOT_LINKED || ret <= GST_FLOW_EOS) {
2587 event = gst_event_new_eos ();
2588 gst_event_set_seqnum (event, src->priv->seqnum);
2589 /* for fatal errors we post an error message, post the error
2590 * first so the app knows about the error first.
2591 * Also don't do this for WRONG_STATE because it happens
2592 * due to flushing and posting an error message because of
2593 * that is the wrong thing to do, e.g. when we're doing
2594 * a flushing seek. */
2595 GST_ELEMENT_ERROR (src, STREAM, FAILED,
2596 (_("Internal data flow error.")),
2597 ("streaming task paused, reason %s (%d)", reason, ret));
2598 gst_pad_push_event (pad, event);
2604 GST_ELEMENT_ERROR (src, STREAM, FAILED,
2605 (_("Internal data flow error.")), ("element returned NULL buffer"));
2606 GST_LIVE_UNLOCK (src);
2612 gst_base_src_set_allocation (GstBaseSrc * basesrc, GstBufferPool * pool,
2613 const GstAllocator * allocator, guint prefix, guint alignment)
2615 GstBufferPool *oldpool;
2616 GstBaseSrcPrivate *priv = basesrc->priv;
2619 GST_DEBUG_OBJECT (basesrc, "activate pool");
2620 if (!gst_buffer_pool_set_active (pool, TRUE))
2621 goto activate_failed;
2624 GST_OBJECT_LOCK (basesrc);
2625 oldpool = priv->pool;
2628 priv->allocator = allocator;
2630 priv->prefix = prefix;
2631 priv->alignment = alignment;
2632 GST_OBJECT_UNLOCK (basesrc);
2635 /* only deactivate if the pool is not the one we're using */
2636 if (oldpool != pool) {
2637 GST_DEBUG_OBJECT (basesrc, "deactivate old pool");
2638 gst_buffer_pool_set_active (oldpool, FALSE);
2640 gst_object_unref (oldpool);
2647 GST_ERROR_OBJECT (basesrc, "failed to activate bufferpool.");
2653 gst_base_src_activate_pool (GstBaseSrc * basesrc, gboolean active)
2655 GstBaseSrcPrivate *priv = basesrc->priv;
2656 GstBufferPool *pool;
2657 gboolean res = TRUE;
2659 GST_OBJECT_LOCK (basesrc);
2660 if ((pool = priv->pool))
2661 pool = gst_object_ref (pool);
2662 GST_OBJECT_UNLOCK (basesrc);
2665 res = gst_buffer_pool_set_active (pool, active);
2666 gst_object_unref (pool);
2672 gst_base_src_prepare_allocation (GstBaseSrc * basesrc, GstCaps * caps)
2674 GstBaseSrcClass *bclass;
2675 gboolean result = TRUE;
2677 GstBufferPool *pool = NULL;
2678 const GstAllocator *allocator = NULL;
2679 guint size, min, max, prefix, alignment;
2681 bclass = GST_BASE_SRC_GET_CLASS (basesrc);
2683 /* make query and let peer pad answer, we don't really care if it worked or
2684 * not, if it failed, the allocation query would contain defaults and the
2685 * subclass would then set better values if needed */
2686 query = gst_query_new_allocation (caps, TRUE);
2687 if (!gst_pad_peer_query (basesrc->srcpad, query)) {
2688 /* not a problem, just debug a little */
2689 GST_DEBUG_OBJECT (basesrc, "peer ALLOCATION query failed");
2692 if (G_LIKELY (bclass->decide_allocation))
2693 result = bclass->decide_allocation (basesrc, query);
2695 GST_DEBUG_OBJECT (basesrc, "ALLOCATION (%d) params: %" GST_PTR_FORMAT, result,
2697 gst_query_parse_allocation_params (query, &size, &min, &max, &prefix,
2701 const gchar *mem = NULL;
2703 /* no size, we have variable size buffers */
2704 if (gst_query_get_n_allocation_memories (query) > 0) {
2705 mem = gst_query_parse_nth_allocation_memory (query, 0);
2707 GST_DEBUG_OBJECT (basesrc, "0 size, getting allocator %s",
2708 GST_STR_NULL (mem));
2709 allocator = gst_allocator_find (mem);
2710 } else if (pool == NULL) {
2711 /* fixed size, we can use a bufferpool */
2712 GstStructure *config;
2714 /* we did not get a pool, make one ourselves then */
2715 pool = gst_buffer_pool_new ();
2716 GST_DEBUG_OBJECT (basesrc, "no pool, making new pool");
2718 config = gst_buffer_pool_get_config (pool);
2719 gst_buffer_pool_config_set (config, caps, size, min, max, prefix,
2721 gst_buffer_pool_set_config (pool, config);
2724 gst_query_unref (query);
2727 gst_base_src_set_allocation (basesrc, pool, allocator, prefix, alignment);
2733 /* default negotiation code.
2735 * Take intersection between src and sink pads, take first
2739 gst_base_src_default_negotiate (GstBaseSrc * basesrc)
2742 GstCaps *caps = NULL;
2743 GstCaps *peercaps = NULL;
2744 gboolean result = FALSE;
2746 /* first see what is possible on our source pad */
2747 thiscaps = gst_pad_query_caps (GST_BASE_SRC_PAD (basesrc), NULL);
2748 GST_DEBUG_OBJECT (basesrc, "caps of src: %" GST_PTR_FORMAT, thiscaps);
2749 /* nothing or anything is allowed, we're done */
2750 if (thiscaps == NULL || gst_caps_is_any (thiscaps))
2751 goto no_nego_needed;
2753 if (G_UNLIKELY (gst_caps_is_empty (thiscaps)))
2756 /* get the peer caps */
2757 peercaps = gst_pad_peer_query_caps (GST_BASE_SRC_PAD (basesrc), thiscaps);
2758 GST_DEBUG_OBJECT (basesrc, "caps of peer: %" GST_PTR_FORMAT, peercaps);
2760 /* The result is already a subset of our caps */
2762 gst_caps_unref (thiscaps);
2764 /* no peer, work with our own caps then */
2767 if (caps && !gst_caps_is_empty (caps)) {
2769 GST_DEBUG_OBJECT (basesrc, "have caps: %" GST_PTR_FORMAT, caps);
2770 if (gst_caps_is_any (caps)) {
2771 GST_DEBUG_OBJECT (basesrc, "any caps, we stop");
2772 /* hmm, still anything, so element can do anything and
2773 * nego is not needed */
2776 caps = gst_caps_make_writable (caps);
2777 gst_base_src_fixate (basesrc, caps);
2778 GST_DEBUG_OBJECT (basesrc, "fixated to: %" GST_PTR_FORMAT, caps);
2779 if (gst_caps_is_fixed (caps)) {
2780 /* yay, fixed caps, use those then, it's possible that the subclass does
2781 * not accept this caps after all and we have to fail. */
2782 result = gst_base_src_set_caps (basesrc, caps);
2785 gst_caps_unref (caps);
2787 GST_DEBUG_OBJECT (basesrc, "no common caps");
2793 GST_DEBUG_OBJECT (basesrc, "no negotiation needed");
2795 gst_caps_unref (thiscaps);
2800 GST_ELEMENT_ERROR (basesrc, STREAM, FORMAT,
2801 ("No supported formats found"),
2802 ("This element did not produce valid caps"));
2804 gst_caps_unref (thiscaps);
2810 gst_base_src_negotiate (GstBaseSrc * basesrc)
2812 GstBaseSrcClass *bclass;
2815 bclass = GST_BASE_SRC_GET_CLASS (basesrc);
2817 GST_DEBUG_OBJECT (basesrc, "starting negotiation");
2819 if (G_LIKELY (bclass->negotiate))
2820 result = bclass->negotiate (basesrc);
2824 if (G_LIKELY (result)) {
2827 caps = gst_pad_get_current_caps (basesrc->srcpad);
2829 result = gst_base_src_prepare_allocation (basesrc, caps);
2832 gst_caps_unref (caps);
2838 gst_base_src_start (GstBaseSrc * basesrc)
2840 GstBaseSrcClass *bclass;
2841 gboolean result, have_size;
2846 if (GST_OBJECT_FLAG_IS_SET (basesrc, GST_BASE_SRC_STARTED))
2849 GST_DEBUG_OBJECT (basesrc, "starting source");
2851 basesrc->num_buffers_left = basesrc->num_buffers;
2853 GST_OBJECT_LOCK (basesrc);
2854 gst_segment_init (&basesrc->segment, basesrc->segment.format);
2855 GST_OBJECT_UNLOCK (basesrc);
2857 basesrc->running = FALSE;
2858 basesrc->priv->segment_pending = FALSE;
2860 bclass = GST_BASE_SRC_GET_CLASS (basesrc);
2862 result = bclass->start (basesrc);
2867 goto could_not_start;
2869 GST_OBJECT_FLAG_SET (basesrc, GST_BASE_SRC_STARTED);
2871 format = basesrc->segment.format;
2873 /* figure out the size */
2876 if (format == GST_FORMAT_BYTES) {
2877 if (bclass->get_size) {
2878 if (!(have_size = bclass->get_size (basesrc, &size)))
2881 GST_DEBUG_OBJECT (basesrc, "setting size %" G_GUINT64_FORMAT, size);
2882 /* only update the size when operating in bytes, subclass is supposed
2883 * to set duration in the start method for other formats */
2884 GST_OBJECT_LOCK (basesrc);
2885 basesrc->segment.duration = size;
2886 GST_OBJECT_UNLOCK (basesrc);
2889 GST_DEBUG_OBJECT (basesrc,
2890 "format: %s, have size: %d, size: %" G_GUINT64_FORMAT ", duration: %"
2891 G_GINT64_FORMAT, gst_format_get_name (format), have_size, size,
2892 basesrc->segment.duration);
2894 seekable = gst_base_src_seekable (basesrc);
2895 GST_DEBUG_OBJECT (basesrc, "is seekable: %d", seekable);
2897 /* update for random access flag */
2898 basesrc->random_access = seekable && format == GST_FORMAT_BYTES;
2900 GST_DEBUG_OBJECT (basesrc, "is random_access: %d", basesrc->random_access);
2902 gst_pad_mark_reconfigure (GST_BASE_SRC_PAD (basesrc));
2909 GST_DEBUG_OBJECT (basesrc, "could not start");
2910 /* subclass is supposed to post a message. We don't have to call _stop. */
2916 gst_base_src_stop (GstBaseSrc * basesrc)
2918 GstBaseSrcClass *bclass;
2919 gboolean result = TRUE;
2921 if (!GST_OBJECT_FLAG_IS_SET (basesrc, GST_BASE_SRC_STARTED))
2924 GST_DEBUG_OBJECT (basesrc, "stopping source");
2926 bclass = GST_BASE_SRC_GET_CLASS (basesrc);
2928 result = bclass->stop (basesrc);
2930 gst_base_src_set_allocation (basesrc, NULL, NULL, 0, 0);
2933 GST_OBJECT_FLAG_UNSET (basesrc, GST_BASE_SRC_STARTED);
2938 /* start or stop flushing dataprocessing
2941 gst_base_src_set_flushing (GstBaseSrc * basesrc,
2942 gboolean flushing, gboolean live_play, gboolean unlock, gboolean * playing)
2944 GstBaseSrcClass *bclass;
2946 bclass = GST_BASE_SRC_GET_CLASS (basesrc);
2948 if (flushing && unlock) {
2949 gst_base_src_activate_pool (basesrc, FALSE);
2950 /* unlock any subclasses, we need to do this before grabbing the
2951 * LIVE_LOCK since we hold this lock before going into ::create. We pass an
2952 * unlock to the params because of backwards compat (see seek handler)*/
2954 bclass->unlock (basesrc);
2957 /* the live lock is released when we are blocked, waiting for playing or
2958 * when we sync to the clock. */
2959 GST_LIVE_LOCK (basesrc);
2961 *playing = basesrc->live_running;
2962 basesrc->priv->flushing = flushing;
2964 /* if we are locked in the live lock, signal it to make it flush */
2965 basesrc->live_running = TRUE;
2967 /* clear pending EOS if any */
2968 g_atomic_int_set (&basesrc->priv->pending_eos, FALSE);
2970 /* step 1, now that we have the LIVE lock, clear our unlock request */
2971 if (bclass->unlock_stop)
2972 bclass->unlock_stop (basesrc);
2974 /* step 2, unblock clock sync (if any) or any other blocking thing */
2975 if (basesrc->clock_id)
2976 gst_clock_id_unschedule (basesrc->clock_id);
2978 /* signal the live source that it can start playing */
2979 basesrc->live_running = live_play;
2981 gst_base_src_activate_pool (basesrc, TRUE);
2983 /* When unlocking drop all delayed events */
2985 GST_OBJECT_LOCK (basesrc);
2986 if (basesrc->priv->pending_events) {
2987 g_list_foreach (basesrc->priv->pending_events, (GFunc) gst_event_unref,
2989 g_list_free (basesrc->priv->pending_events);
2990 basesrc->priv->pending_events = NULL;
2991 g_atomic_int_set (&basesrc->priv->have_events, FALSE);
2993 GST_OBJECT_UNLOCK (basesrc);
2996 GST_LIVE_SIGNAL (basesrc);
2997 GST_LIVE_UNLOCK (basesrc);
3002 /* the purpose of this function is to make sure that a live source blocks in the
3003 * LIVE lock or leaves the LIVE lock and continues playing. */
3005 gst_base_src_set_playing (GstBaseSrc * basesrc, gboolean live_play)
3007 GstBaseSrcClass *bclass;
3009 bclass = GST_BASE_SRC_GET_CLASS (basesrc);
3011 /* unlock subclasses locked in ::create, we only do this when we stop playing. */
3013 GST_DEBUG_OBJECT (basesrc, "unlock");
3015 bclass->unlock (basesrc);
3018 /* we are now able to grab the LIVE lock, when we get it, we can be
3019 * waiting for PLAYING while blocked in the LIVE cond or we can be waiting
3021 GST_LIVE_LOCK (basesrc);
3022 GST_DEBUG_OBJECT (basesrc, "unschedule clock");
3024 /* unblock clock sync (if any) */
3025 if (basesrc->clock_id)
3026 gst_clock_id_unschedule (basesrc->clock_id);
3028 /* configure what to do when we get to the LIVE lock. */
3029 GST_DEBUG_OBJECT (basesrc, "live running %d", live_play);
3030 basesrc->live_running = live_play;
3035 /* clear our unlock request when going to PLAYING */
3036 GST_DEBUG_OBJECT (basesrc, "unlock stop");
3037 if (bclass->unlock_stop)
3038 bclass->unlock_stop (basesrc);
3040 /* for live sources we restart the timestamp correction */
3041 basesrc->priv->latency = -1;
3042 /* have to restart the task in case it stopped because of the unlock when
3043 * we went to PAUSED. Only do this if we operating in push mode. */
3044 GST_OBJECT_LOCK (basesrc->srcpad);
3045 start = (GST_PAD_MODE (basesrc->srcpad) == GST_PAD_MODE_PUSH);
3046 GST_OBJECT_UNLOCK (basesrc->srcpad);
3048 gst_pad_start_task (basesrc->srcpad, (GstTaskFunction) gst_base_src_loop,
3050 GST_DEBUG_OBJECT (basesrc, "signal");
3051 GST_LIVE_SIGNAL (basesrc);
3053 GST_LIVE_UNLOCK (basesrc);
3059 gst_base_src_activate_push (GstPad * pad, GstObject * parent, gboolean active)
3061 GstBaseSrc *basesrc;
3064 basesrc = GST_BASE_SRC (parent);
3066 /* prepare subclass first */
3068 GST_DEBUG_OBJECT (basesrc, "Activating in push mode");
3070 if (G_UNLIKELY (!basesrc->can_activate_push))
3071 goto no_push_activation;
3073 if (G_UNLIKELY (!gst_base_src_start (basesrc)))
3076 basesrc->priv->discont = TRUE;
3077 gst_base_src_set_flushing (basesrc, FALSE, FALSE, FALSE, NULL);
3079 /* do initial seek, which will start the task */
3080 GST_OBJECT_LOCK (basesrc);
3081 event = basesrc->pending_seek;
3082 basesrc->pending_seek = NULL;
3083 GST_OBJECT_UNLOCK (basesrc);
3085 /* no need to unlock anything, the task is certainly
3086 * not running here. The perform seek code will start the task when
3088 if (G_UNLIKELY (!gst_base_src_perform_seek (basesrc, event, FALSE)))
3092 gst_event_unref (event);
3094 GST_DEBUG_OBJECT (basesrc, "Deactivating in push mode");
3096 gst_base_src_set_flushing (basesrc, TRUE, FALSE, TRUE, NULL);
3098 gst_pad_stop_task (pad);
3099 /* now we can stop the source */
3100 if (G_UNLIKELY (!gst_base_src_stop (basesrc)))
3108 GST_WARNING_OBJECT (basesrc, "Subclass disabled push-mode activation");
3113 GST_WARNING_OBJECT (basesrc, "Failed to start in push mode");
3118 GST_ERROR_OBJECT (basesrc, "Failed to perform initial seek");
3120 gst_base_src_set_flushing (basesrc, TRUE, FALSE, TRUE, NULL);
3122 gst_pad_stop_task (pad);
3123 /* Stop the basesrc */
3124 gst_base_src_stop (basesrc);
3126 gst_event_unref (event);
3131 GST_DEBUG_OBJECT (basesrc, "Failed to stop in push mode");
3137 gst_base_src_activate_pull (GstPad * pad, GstObject * parent, gboolean active)
3139 GstBaseSrc *basesrc;
3141 basesrc = GST_BASE_SRC (parent);
3143 /* prepare subclass first */
3145 GST_DEBUG_OBJECT (basesrc, "Activating in pull mode");
3146 if (G_UNLIKELY (!gst_base_src_start (basesrc)))
3149 /* if not random_access, we cannot operate in pull mode for now */
3150 if (G_UNLIKELY (!gst_base_src_is_random_access (basesrc)))
3153 /* stop flushing now but for live sources, still block in the LIVE lock when
3154 * we are not yet PLAYING */
3155 gst_base_src_set_flushing (basesrc, FALSE, FALSE, FALSE, NULL);
3157 GST_DEBUG_OBJECT (basesrc, "Deactivating in pull mode");
3158 /* flush all, there is no task to stop */
3159 gst_base_src_set_flushing (basesrc, TRUE, FALSE, TRUE, NULL);
3161 if (G_UNLIKELY (!gst_base_src_stop (basesrc)))
3169 GST_ERROR_OBJECT (basesrc, "Failed to start in pull mode");
3174 GST_ERROR_OBJECT (basesrc, "Cannot operate in pull mode, stopping");
3175 gst_base_src_stop (basesrc);
3180 GST_ERROR_OBJECT (basesrc, "Failed to stop in pull mode");
3185 static GstStateChangeReturn
3186 gst_base_src_change_state (GstElement * element, GstStateChange transition)
3188 GstBaseSrc *basesrc;
3189 GstStateChangeReturn result;
3190 gboolean no_preroll = FALSE;
3192 basesrc = GST_BASE_SRC (element);
3194 switch (transition) {
3195 case GST_STATE_CHANGE_NULL_TO_READY:
3197 case GST_STATE_CHANGE_READY_TO_PAUSED:
3198 no_preroll = gst_base_src_is_live (basesrc);
3200 case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
3201 GST_DEBUG_OBJECT (basesrc, "PAUSED->PLAYING");
3202 if (gst_base_src_is_live (basesrc)) {
3203 /* now we can start playback */
3204 gst_base_src_set_playing (basesrc, TRUE);
3212 GST_ELEMENT_CLASS (parent_class)->change_state (element,
3213 transition)) == GST_STATE_CHANGE_FAILURE)
3216 switch (transition) {
3217 case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
3218 GST_DEBUG_OBJECT (basesrc, "PLAYING->PAUSED");
3219 if (gst_base_src_is_live (basesrc)) {
3220 /* make sure we block in the live lock in PAUSED */
3221 gst_base_src_set_playing (basesrc, FALSE);
3225 case GST_STATE_CHANGE_PAUSED_TO_READY:
3229 /* we don't need to unblock anything here, the pad deactivation code
3230 * already did this */
3231 g_atomic_int_set (&basesrc->priv->pending_eos, FALSE);
3232 event_p = &basesrc->pending_seek;
3233 gst_event_replace (event_p, NULL);
3236 case GST_STATE_CHANGE_READY_TO_NULL:
3242 if (no_preroll && result == GST_STATE_CHANGE_SUCCESS)
3243 result = GST_STATE_CHANGE_NO_PREROLL;
3250 GST_DEBUG_OBJECT (basesrc, "parent failed state change");