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_mode (GstPad * pad, GstObject * parent,
288 GstPadMode mode, gboolean active);
289 static void gst_base_src_set_property (GObject * object, guint prop_id,
290 const GValue * value, GParamSpec * pspec);
291 static void gst_base_src_get_property (GObject * object, guint prop_id,
292 GValue * value, GParamSpec * pspec);
293 static gboolean gst_base_src_event (GstPad * pad, GstObject * parent,
295 static gboolean gst_base_src_send_event (GstElement * elem, GstEvent * event);
296 static gboolean gst_base_src_default_event (GstBaseSrc * src, GstEvent * event);
298 static gboolean gst_base_src_query (GstPad * pad, GstObject * parent,
301 static gboolean gst_base_src_activate_pool (GstBaseSrc * basesrc,
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);
309 static GstFlowReturn gst_base_src_default_create (GstBaseSrc * basesrc,
310 guint64 offset, guint size, GstBuffer ** buf);
311 static GstFlowReturn gst_base_src_default_alloc (GstBaseSrc * basesrc,
312 guint64 offset, guint size, GstBuffer ** buf);
314 static gboolean gst_base_src_set_flushing (GstBaseSrc * basesrc,
315 gboolean flushing, gboolean live_play, gboolean unlock, gboolean * playing);
316 static gboolean gst_base_src_start (GstBaseSrc * basesrc);
317 static gboolean gst_base_src_stop (GstBaseSrc * basesrc);
319 static GstStateChangeReturn gst_base_src_change_state (GstElement * element,
320 GstStateChange transition);
322 static void gst_base_src_loop (GstPad * pad);
323 static GstFlowReturn gst_base_src_getrange (GstPad * pad, GstObject * parent,
324 guint64 offset, guint length, GstBuffer ** buf);
325 static GstFlowReturn gst_base_src_get_range (GstBaseSrc * src, guint64 offset,
326 guint length, GstBuffer ** buf);
327 static gboolean gst_base_src_seekable (GstBaseSrc * src);
328 static gboolean gst_base_src_negotiate (GstBaseSrc * basesrc);
329 static gboolean gst_base_src_update_length (GstBaseSrc * src, guint64 offset,
333 gst_base_src_class_init (GstBaseSrcClass * klass)
335 GObjectClass *gobject_class;
336 GstElementClass *gstelement_class;
338 gobject_class = G_OBJECT_CLASS (klass);
339 gstelement_class = GST_ELEMENT_CLASS (klass);
341 GST_DEBUG_CATEGORY_INIT (gst_base_src_debug, "basesrc", 0, "basesrc element");
343 g_type_class_add_private (klass, sizeof (GstBaseSrcPrivate));
345 parent_class = g_type_class_peek_parent (klass);
347 gobject_class->finalize = gst_base_src_finalize;
348 gobject_class->set_property = gst_base_src_set_property;
349 gobject_class->get_property = gst_base_src_get_property;
351 g_object_class_install_property (gobject_class, PROP_BLOCKSIZE,
352 g_param_spec_uint ("blocksize", "Block size",
353 "Size in bytes to read per buffer (-1 = default)", 0, G_MAXUINT,
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);
373 klass->get_caps = GST_DEBUG_FUNCPTR (gst_base_src_default_get_caps);
374 klass->negotiate = GST_DEBUG_FUNCPTR (gst_base_src_default_negotiate);
375 klass->fixate = GST_DEBUG_FUNCPTR (gst_base_src_default_fixate);
376 klass->prepare_seek_segment =
377 GST_DEBUG_FUNCPTR (gst_base_src_default_prepare_seek_segment);
378 klass->do_seek = GST_DEBUG_FUNCPTR (gst_base_src_default_do_seek);
379 klass->query = GST_DEBUG_FUNCPTR (gst_base_src_default_query);
380 klass->event = GST_DEBUG_FUNCPTR (gst_base_src_default_event);
381 klass->create = GST_DEBUG_FUNCPTR (gst_base_src_default_create);
382 klass->alloc = GST_DEBUG_FUNCPTR (gst_base_src_default_alloc);
384 /* Registering debug symbols for function pointers */
385 GST_DEBUG_REGISTER_FUNCPTR (gst_base_src_activate_mode);
386 GST_DEBUG_REGISTER_FUNCPTR (gst_base_src_event);
387 GST_DEBUG_REGISTER_FUNCPTR (gst_base_src_query);
388 GST_DEBUG_REGISTER_FUNCPTR (gst_base_src_getrange);
389 GST_DEBUG_REGISTER_FUNCPTR (gst_base_src_fixate);
393 gst_base_src_init (GstBaseSrc * basesrc, gpointer g_class)
396 GstPadTemplate *pad_template;
398 basesrc->priv = GST_BASE_SRC_GET_PRIVATE (basesrc);
400 basesrc->is_live = FALSE;
401 basesrc->live_lock = g_mutex_new ();
402 basesrc->live_cond = g_cond_new ();
403 basesrc->num_buffers = DEFAULT_NUM_BUFFERS;
404 basesrc->num_buffers_left = -1;
406 basesrc->can_activate_push = TRUE;
409 gst_element_class_get_pad_template (GST_ELEMENT_CLASS (g_class), "src");
410 g_return_if_fail (pad_template != NULL);
412 GST_DEBUG_OBJECT (basesrc, "creating src pad");
413 pad = gst_pad_new_from_template (pad_template, "src");
415 GST_DEBUG_OBJECT (basesrc, "setting functions on src pad");
416 gst_pad_set_activatemode_function (pad, gst_base_src_activate_mode);
417 gst_pad_set_event_function (pad, gst_base_src_event);
418 gst_pad_set_query_function (pad, gst_base_src_query);
419 gst_pad_set_getrange_function (pad, gst_base_src_getrange);
421 /* hold pointer to pad */
422 basesrc->srcpad = pad;
423 GST_DEBUG_OBJECT (basesrc, "adding src pad");
424 gst_element_add_pad (GST_ELEMENT (basesrc), pad);
426 basesrc->blocksize = DEFAULT_BLOCKSIZE;
427 basesrc->clock_id = NULL;
428 /* we operate in BYTES by default */
429 gst_base_src_set_format (basesrc, GST_FORMAT_BYTES);
430 basesrc->typefind = DEFAULT_TYPEFIND;
431 basesrc->priv->do_timestamp = DEFAULT_DO_TIMESTAMP;
432 g_atomic_int_set (&basesrc->priv->have_events, FALSE);
434 GST_OBJECT_FLAG_UNSET (basesrc, GST_BASE_SRC_STARTED);
435 GST_OBJECT_FLAG_SET (basesrc, GST_ELEMENT_IS_SOURCE);
437 GST_DEBUG_OBJECT (basesrc, "init done");
441 gst_base_src_finalize (GObject * object)
446 basesrc = GST_BASE_SRC (object);
448 g_mutex_free (basesrc->live_lock);
449 g_cond_free (basesrc->live_cond);
451 event_p = &basesrc->pending_seek;
452 gst_event_replace (event_p, NULL);
454 if (basesrc->priv->pending_events) {
455 g_list_foreach (basesrc->priv->pending_events, (GFunc) gst_event_unref,
457 g_list_free (basesrc->priv->pending_events);
460 G_OBJECT_CLASS (parent_class)->finalize (object);
464 * gst_base_src_wait_playing:
467 * If the #GstBaseSrcClass.create() method performs its own synchronisation
468 * against the clock it must unblock when going from PLAYING to the PAUSED state
469 * and call this method before continuing to produce the remaining data.
471 * This function will block until a state change to PLAYING happens (in which
472 * case this function returns #GST_FLOW_OK) or the processing must be stopped due
473 * to a state change to READY or a FLUSH event (in which case this function
474 * returns #GST_FLOW_WRONG_STATE).
478 * Returns: #GST_FLOW_OK if @src is PLAYING and processing can
479 * continue. Any other return value should be returned from the create vmethod.
482 gst_base_src_wait_playing (GstBaseSrc * src)
484 g_return_val_if_fail (GST_IS_BASE_SRC (src), GST_FLOW_ERROR);
487 /* block until the state changes, or we get a flush, or something */
488 GST_DEBUG_OBJECT (src, "live source waiting for running state");
490 GST_DEBUG_OBJECT (src, "live source unlocked");
491 if (src->priv->flushing)
493 } while (G_UNLIKELY (!src->live_running));
500 GST_DEBUG_OBJECT (src, "we are flushing");
501 return GST_FLOW_WRONG_STATE;
506 * gst_base_src_set_live:
507 * @src: base source instance
508 * @live: new live-mode
510 * If the element listens to a live source, @live should
513 * A live source will not produce data in the PAUSED state and
514 * will therefore not be able to participate in the PREROLL phase
515 * of a pipeline. To signal this fact to the application and the
516 * pipeline, the state change return value of the live source will
517 * be GST_STATE_CHANGE_NO_PREROLL.
520 gst_base_src_set_live (GstBaseSrc * src, gboolean live)
522 g_return_if_fail (GST_IS_BASE_SRC (src));
524 GST_OBJECT_LOCK (src);
526 GST_OBJECT_UNLOCK (src);
530 * gst_base_src_is_live:
531 * @src: base source instance
533 * Check if an element is in live mode.
535 * Returns: %TRUE if element is in live mode.
538 gst_base_src_is_live (GstBaseSrc * src)
542 g_return_val_if_fail (GST_IS_BASE_SRC (src), FALSE);
544 GST_OBJECT_LOCK (src);
545 result = src->is_live;
546 GST_OBJECT_UNLOCK (src);
552 * gst_base_src_set_format:
553 * @src: base source instance
554 * @format: the format to use
556 * Sets the default format of the source. This will be the format used
557 * for sending NEW_SEGMENT events and for performing seeks.
559 * If a format of GST_FORMAT_BYTES is set, the element will be able to
560 * operate in pull mode if the #GstBaseSrcClass.is_seekable() returns TRUE.
562 * This function must only be called in states < %GST_STATE_PAUSED.
567 gst_base_src_set_format (GstBaseSrc * src, GstFormat format)
569 g_return_if_fail (GST_IS_BASE_SRC (src));
570 g_return_if_fail (GST_STATE (src) <= GST_STATE_READY);
572 GST_OBJECT_LOCK (src);
573 gst_segment_init (&src->segment, format);
574 GST_OBJECT_UNLOCK (src);
578 * gst_base_src_set_dynamic_size:
579 * @src: base source instance
580 * @dynamic: new dynamic size mode
582 * If not @dynamic, size is only updated when needed, such as when trying to
583 * read past current tracked size. Otherwise, size is checked for upon each
589 gst_base_src_set_dynamic_size (GstBaseSrc * src, gboolean dynamic)
591 g_return_if_fail (GST_IS_BASE_SRC (src));
593 g_atomic_int_set (&src->priv->dynamic_size, dynamic);
597 * gst_base_src_query_latency:
599 * @live: (out) (allow-none): if the source is live
600 * @min_latency: (out) (allow-none): the min latency of the source
601 * @max_latency: (out) (allow-none): the max latency of the source
603 * Query the source for the latency parameters. @live will be TRUE when @src is
604 * configured as a live source. @min_latency will be set to the difference
605 * between the running time and the timestamp of the first buffer.
606 * @max_latency is always the undefined value of -1.
608 * This function is mostly used by subclasses.
610 * Returns: TRUE if the query succeeded.
615 gst_base_src_query_latency (GstBaseSrc * src, gboolean * live,
616 GstClockTime * min_latency, GstClockTime * max_latency)
620 g_return_val_if_fail (GST_IS_BASE_SRC (src), FALSE);
622 GST_OBJECT_LOCK (src);
624 *live = src->is_live;
626 /* if we have a startup latency, report this one, else report 0. Subclasses
627 * are supposed to override the query function if they want something
629 if (src->priv->latency != -1)
630 min = src->priv->latency;
639 GST_LOG_OBJECT (src, "latency: live %d, min %" GST_TIME_FORMAT
640 ", max %" GST_TIME_FORMAT, src->is_live, GST_TIME_ARGS (min),
642 GST_OBJECT_UNLOCK (src);
648 * gst_base_src_set_blocksize:
650 * @blocksize: the new blocksize in bytes
652 * Set the number of bytes that @src will push out with each buffer. When
653 * @blocksize is set to -1, a default length will be used.
658 gst_base_src_set_blocksize (GstBaseSrc * src, guint blocksize)
660 g_return_if_fail (GST_IS_BASE_SRC (src));
662 GST_OBJECT_LOCK (src);
663 src->blocksize = blocksize;
664 GST_OBJECT_UNLOCK (src);
668 * gst_base_src_get_blocksize:
671 * Get the number of bytes that @src will push out with each buffer.
673 * Returns: the number of bytes pushed with each buffer.
678 gst_base_src_get_blocksize (GstBaseSrc * src)
682 g_return_val_if_fail (GST_IS_BASE_SRC (src), 0);
684 GST_OBJECT_LOCK (src);
685 res = src->blocksize;
686 GST_OBJECT_UNLOCK (src);
693 * gst_base_src_set_do_timestamp:
695 * @timestamp: enable or disable timestamping
697 * Configure @src to automatically timestamp outgoing buffers based on the
698 * current running_time of the pipeline. This property is mostly useful for live
704 gst_base_src_set_do_timestamp (GstBaseSrc * src, gboolean timestamp)
706 g_return_if_fail (GST_IS_BASE_SRC (src));
708 GST_OBJECT_LOCK (src);
709 src->priv->do_timestamp = timestamp;
710 GST_OBJECT_UNLOCK (src);
714 * gst_base_src_get_do_timestamp:
717 * Query if @src timestamps outgoing buffers based on the current running_time.
719 * Returns: %TRUE if the base class will automatically timestamp outgoing buffers.
724 gst_base_src_get_do_timestamp (GstBaseSrc * src)
728 g_return_val_if_fail (GST_IS_BASE_SRC (src), FALSE);
730 GST_OBJECT_LOCK (src);
731 res = src->priv->do_timestamp;
732 GST_OBJECT_UNLOCK (src);
738 * gst_base_src_new_seamless_segment:
740 * @start: The new start value for the segment
741 * @stop: Stop value for the new segment
742 * @position: The position value for the new segent
744 * Prepare a new seamless segment for emission downstream. This function must
745 * only be called by derived sub-classes, and only from the create() function,
746 * as the stream-lock needs to be held.
748 * The format for the new segment will be the current format of the source, as
749 * configured with gst_base_src_set_format()
751 * Returns: %TRUE if preparation of the seamless segment succeeded.
756 gst_base_src_new_seamless_segment (GstBaseSrc * src, gint64 start, gint64 stop,
761 GST_DEBUG_OBJECT (src,
762 "Starting new seamless segment. Start %" GST_TIME_FORMAT " stop %"
763 GST_TIME_FORMAT " position %" GST_TIME_FORMAT, GST_TIME_ARGS (start),
764 GST_TIME_ARGS (stop), GST_TIME_ARGS (position));
766 GST_OBJECT_LOCK (src);
768 src->segment.base = gst_segment_to_running_time (&src->segment,
769 src->segment.format, src->segment.position);
770 src->segment.start = start;
771 src->segment.stop = stop;
772 src->segment.position = position;
774 /* forward, we send data from position to stop */
775 src->priv->segment_pending = TRUE;
776 GST_OBJECT_UNLOCK (src);
778 src->priv->discont = TRUE;
785 * gst_base_src_set_caps:
786 * @src: a #GstBaseSrc
789 * Set new caps on the basesrc source pad.
791 * Returns: %TRUE if the caps could be set
794 gst_base_src_set_caps (GstBaseSrc * src, GstCaps * caps)
796 GstBaseSrcClass *bclass;
799 bclass = GST_BASE_SRC_GET_CLASS (src);
801 gst_pad_push_event (src->srcpad, gst_event_new_caps (caps));
803 if (bclass->set_caps)
804 res = bclass->set_caps (src, caps);
810 gst_base_src_default_get_caps (GstBaseSrc * bsrc, GstCaps * filter)
812 GstCaps *caps = NULL;
813 GstPadTemplate *pad_template;
814 GstBaseSrcClass *bclass;
816 bclass = GST_BASE_SRC_GET_CLASS (bsrc);
819 gst_element_class_get_pad_template (GST_ELEMENT_CLASS (bclass), "src");
821 if (pad_template != NULL) {
822 caps = gst_pad_template_get_caps (pad_template);
825 GstCaps *intersection;
828 gst_caps_intersect_full (filter, caps, GST_CAPS_INTERSECT_FIRST);
829 gst_caps_unref (caps);
837 gst_base_src_default_fixate (GstBaseSrc * bsrc, GstCaps * caps)
839 GST_DEBUG_OBJECT (bsrc, "using default caps fixate function");
840 gst_caps_fixate (caps);
844 gst_base_src_fixate (GstBaseSrc * bsrc, GstCaps * caps)
846 GstBaseSrcClass *bclass;
848 bclass = GST_BASE_SRC_GET_CLASS (bsrc);
851 bclass->fixate (bsrc, caps);
855 gst_base_src_default_query (GstBaseSrc * src, GstQuery * query)
859 switch (GST_QUERY_TYPE (query)) {
860 case GST_QUERY_POSITION:
864 gst_query_parse_position (query, &format, NULL);
866 GST_DEBUG_OBJECT (src, "position query in format %s",
867 gst_format_get_name (format));
870 case GST_FORMAT_PERCENT:
876 GST_OBJECT_LOCK (src);
877 position = src->segment.position;
878 duration = src->segment.duration;
879 GST_OBJECT_UNLOCK (src);
881 if (position != -1 && duration != -1) {
882 if (position < duration)
883 percent = gst_util_uint64_scale (GST_FORMAT_PERCENT_MAX, position,
886 percent = GST_FORMAT_PERCENT_MAX;
890 gst_query_set_position (query, GST_FORMAT_PERCENT, percent);
897 GstFormat seg_format;
899 GST_OBJECT_LOCK (src);
901 gst_segment_to_stream_time (&src->segment, src->segment.format,
902 src->segment.position);
903 seg_format = src->segment.format;
904 GST_OBJECT_UNLOCK (src);
906 if (position != -1) {
907 /* convert to requested format */
909 gst_pad_query_convert (src->srcpad, seg_format,
910 position, format, &position);
914 gst_query_set_position (query, format, position);
920 case GST_QUERY_DURATION:
924 gst_query_parse_duration (query, &format, NULL);
926 GST_DEBUG_OBJECT (src, "duration query in format %s",
927 gst_format_get_name (format));
930 case GST_FORMAT_PERCENT:
931 gst_query_set_duration (query, GST_FORMAT_PERCENT,
932 GST_FORMAT_PERCENT_MAX);
938 GstFormat seg_format;
941 /* may have to refresh duration */
942 if (g_atomic_int_get (&src->priv->dynamic_size))
943 gst_base_src_update_length (src, 0, &length);
945 /* this is the duration as configured by the subclass. */
946 GST_OBJECT_LOCK (src);
947 duration = src->segment.duration;
948 seg_format = src->segment.format;
949 GST_OBJECT_UNLOCK (src);
951 GST_LOG_OBJECT (src, "duration %" G_GINT64_FORMAT ", format %s",
952 duration, gst_format_get_name (seg_format));
954 if (duration != -1) {
955 /* convert to requested format, if this fails, we have a duration
956 * but we cannot answer the query, we must return FALSE. */
958 gst_pad_query_convert (src->srcpad, seg_format,
959 duration, format, &duration);
961 /* The subclass did not configure a duration, we assume that the
962 * media has an unknown duration then and we return TRUE to report
963 * this. Note that this is not the same as returning FALSE, which
964 * means that we cannot report the duration at all. */
967 gst_query_set_duration (query, format, duration);
974 case GST_QUERY_SEEKING:
976 GstFormat format, seg_format;
979 GST_OBJECT_LOCK (src);
980 duration = src->segment.duration;
981 seg_format = src->segment.format;
982 GST_OBJECT_UNLOCK (src);
984 gst_query_parse_seeking (query, &format, NULL, NULL, NULL);
985 if (format == seg_format) {
986 gst_query_set_seeking (query, seg_format,
987 gst_base_src_seekable (src), 0, duration);
990 /* FIXME 0.11: return TRUE + seekable=FALSE for SEEKING query here */
991 /* Don't reply to the query to make up for demuxers which don't
992 * handle the SEEKING query yet. Players like Totem will fall back
993 * to the duration when the SEEKING query isn't answered. */
998 case GST_QUERY_SEGMENT:
1002 GST_OBJECT_LOCK (src);
1003 /* no end segment configured, current duration then */
1004 if ((stop = src->segment.stop) == -1)
1005 stop = src->segment.duration;
1006 start = src->segment.start;
1008 /* adjust to stream time */
1009 if (src->segment.time != -1) {
1010 start -= src->segment.time;
1012 stop -= src->segment.time;
1015 gst_query_set_segment (query, src->segment.rate, src->segment.format,
1017 GST_OBJECT_UNLOCK (src);
1022 case GST_QUERY_FORMATS:
1024 gst_query_set_formats (query, 3, GST_FORMAT_DEFAULT,
1025 GST_FORMAT_BYTES, GST_FORMAT_PERCENT);
1029 case GST_QUERY_CONVERT:
1031 GstFormat src_fmt, dest_fmt;
1032 gint64 src_val, dest_val;
1034 gst_query_parse_convert (query, &src_fmt, &src_val, &dest_fmt, &dest_val);
1036 /* we can only convert between equal formats... */
1037 if (src_fmt == dest_fmt) {
1043 gst_query_set_convert (query, src_fmt, src_val, dest_fmt, dest_val);
1046 case GST_QUERY_LATENCY:
1048 GstClockTime min, max;
1051 /* Subclasses should override and implement something useful */
1052 res = gst_base_src_query_latency (src, &live, &min, &max);
1054 GST_LOG_OBJECT (src, "report latency: live %d, min %" GST_TIME_FORMAT
1055 ", max %" GST_TIME_FORMAT, live, GST_TIME_ARGS (min),
1056 GST_TIME_ARGS (max));
1058 gst_query_set_latency (query, live, min, max);
1061 case GST_QUERY_JITTER:
1062 case GST_QUERY_RATE:
1065 case GST_QUERY_BUFFERING:
1067 GstFormat format, seg_format;
1068 gint64 start, stop, estimated;
1070 gst_query_parse_buffering_range (query, &format, NULL, NULL, NULL);
1072 GST_DEBUG_OBJECT (src, "buffering query in format %s",
1073 gst_format_get_name (format));
1075 GST_OBJECT_LOCK (src);
1076 if (src->random_access) {
1079 if (format == GST_FORMAT_PERCENT)
1080 stop = GST_FORMAT_PERCENT_MAX;
1082 stop = src->segment.duration;
1088 seg_format = src->segment.format;
1089 GST_OBJECT_UNLOCK (src);
1091 /* convert to required format. When the conversion fails, we can't answer
1092 * the query. When the value is unknown, we can don't perform conversion
1093 * but report TRUE. */
1094 if (format != GST_FORMAT_PERCENT && stop != -1) {
1095 res = gst_pad_query_convert (src->srcpad, seg_format,
1096 stop, format, &stop);
1100 if (res && format != GST_FORMAT_PERCENT && start != -1)
1101 res = gst_pad_query_convert (src->srcpad, seg_format,
1102 start, format, &start);
1104 gst_query_set_buffering_range (query, format, start, stop, estimated);
1107 case GST_QUERY_SCHEDULING:
1109 gboolean random_access;
1111 random_access = gst_base_src_is_random_access (src);
1113 /* we can operate in getrange mode if the native format is bytes
1114 * and we are seekable, this condition is set in the random_access
1115 * flag and is set in the _start() method. */
1116 gst_query_set_scheduling (query, GST_SCHEDULING_FLAG_SEEKABLE, 1, -1, 0);
1118 gst_query_add_scheduling_mode (query, GST_PAD_MODE_PULL);
1119 gst_query_add_scheduling_mode (query, GST_PAD_MODE_PUSH);
1124 case GST_QUERY_CAPS:
1126 GstBaseSrcClass *bclass;
1127 GstCaps *caps, *filter;
1129 bclass = GST_BASE_SRC_GET_CLASS (src);
1130 if (bclass->get_caps) {
1131 gst_query_parse_caps (query, &filter);
1132 caps = bclass->get_caps (src, filter);
1133 gst_query_set_caps_result (query, caps);
1134 gst_caps_unref (caps);
1144 GST_DEBUG_OBJECT (src, "query %s returns %d", GST_QUERY_TYPE_NAME (query),
1151 gst_base_src_query (GstPad * pad, GstObject * parent, GstQuery * query)
1154 GstBaseSrcClass *bclass;
1155 gboolean result = FALSE;
1157 src = GST_BASE_SRC (parent);
1158 bclass = GST_BASE_SRC_GET_CLASS (src);
1161 result = bclass->query (src, query);
1167 gst_base_src_default_do_seek (GstBaseSrc * src, GstSegment * segment)
1169 gboolean res = TRUE;
1171 /* update our offset if the start/stop position was updated */
1172 if (segment->format == GST_FORMAT_BYTES) {
1173 segment->time = segment->start;
1174 } else if (segment->start == 0) {
1175 /* seek to start, we can implement a default for this. */
1179 GST_INFO_OBJECT (src, "Can't do a default seek");
1186 gst_base_src_do_seek (GstBaseSrc * src, GstSegment * segment)
1188 GstBaseSrcClass *bclass;
1189 gboolean result = FALSE;
1191 bclass = GST_BASE_SRC_GET_CLASS (src);
1193 if (bclass->do_seek)
1194 result = bclass->do_seek (src, segment);
1199 #define SEEK_TYPE_IS_RELATIVE(t) (((t) != GST_SEEK_TYPE_NONE) && ((t) != GST_SEEK_TYPE_SET))
1202 gst_base_src_default_prepare_seek_segment (GstBaseSrc * src, GstEvent * event,
1203 GstSegment * segment)
1205 /* By default, we try one of 2 things:
1206 * - For absolute seek positions, convert the requested position to our
1207 * configured processing format and place it in the output segment \
1208 * - For relative seek positions, convert our current (input) values to the
1209 * seek format, adjust by the relative seek offset and then convert back to
1210 * the processing format
1212 GstSeekType cur_type, stop_type;
1215 GstFormat seek_format, dest_format;
1218 gboolean res = TRUE;
1220 gst_event_parse_seek (event, &rate, &seek_format, &flags,
1221 &cur_type, &cur, &stop_type, &stop);
1222 dest_format = segment->format;
1224 if (seek_format == dest_format) {
1225 gst_segment_do_seek (segment, rate, seek_format, flags,
1226 cur_type, cur, stop_type, stop, &update);
1230 if (cur_type != GST_SEEK_TYPE_NONE) {
1231 /* FIXME: Handle seek_cur & seek_end by converting the input segment vals */
1233 gst_pad_query_convert (src->srcpad, seek_format, cur, dest_format,
1235 cur_type = GST_SEEK_TYPE_SET;
1238 if (res && stop_type != GST_SEEK_TYPE_NONE) {
1239 /* FIXME: Handle seek_cur & seek_end by converting the input segment vals */
1241 gst_pad_query_convert (src->srcpad, seek_format, stop, dest_format,
1243 stop_type = GST_SEEK_TYPE_SET;
1246 /* And finally, configure our output segment in the desired format */
1247 gst_segment_do_seek (segment, rate, dest_format, flags, cur_type, cur,
1248 stop_type, stop, &update);
1257 GST_DEBUG_OBJECT (src, "undefined format given, seek aborted.");
1263 gst_base_src_prepare_seek_segment (GstBaseSrc * src, GstEvent * event,
1264 GstSegment * seeksegment)
1266 GstBaseSrcClass *bclass;
1267 gboolean result = FALSE;
1269 bclass = GST_BASE_SRC_GET_CLASS (src);
1271 if (bclass->prepare_seek_segment)
1272 result = bclass->prepare_seek_segment (src, event, seeksegment);
1277 static GstFlowReturn
1278 gst_base_src_default_alloc (GstBaseSrc * src, guint64 offset,
1279 guint size, GstBuffer ** buffer)
1282 GstBaseSrcPrivate *priv = src->priv;
1285 ret = gst_buffer_pool_acquire_buffer (priv->pool, buffer, NULL);
1286 } else if (size != -1) {
1287 *buffer = gst_buffer_new_allocate (priv->allocator, size, priv->alignment);
1288 if (G_UNLIKELY (*buffer == NULL))
1293 GST_WARNING_OBJECT (src, "Not trying to alloc %u bytes. Blocksize not set?",
1302 GST_ERROR_OBJECT (src, "Failed to allocate %u bytes", size);
1303 return GST_FLOW_ERROR;
1307 static GstFlowReturn
1308 gst_base_src_default_create (GstBaseSrc * src, guint64 offset,
1309 guint size, GstBuffer ** buffer)
1311 GstBaseSrcClass *bclass;
1314 bclass = GST_BASE_SRC_GET_CLASS (src);
1316 if (G_UNLIKELY (!bclass->alloc))
1318 if (G_UNLIKELY (!bclass->fill))
1321 ret = bclass->alloc (src, offset, size, buffer);
1322 if (G_UNLIKELY (ret != GST_FLOW_OK))
1325 if (G_LIKELY (size > 0)) {
1326 /* only call fill when there is a size */
1327 ret = bclass->fill (src, offset, size, *buffer);
1328 if (G_UNLIKELY (ret != GST_FLOW_OK))
1337 GST_DEBUG_OBJECT (src, "no fill or alloc function");
1338 return GST_FLOW_NOT_SUPPORTED;
1342 GST_DEBUG_OBJECT (src, "Failed to allocate buffer of %u bytes", size);
1347 GST_DEBUG_OBJECT (src, "fill returned %d (%s)", ret,
1348 gst_flow_get_name (ret));
1349 gst_buffer_unref (*buffer);
1354 /* this code implements the seeking. It is a good example
1355 * handling all cases.
1357 * A seek updates the currently configured segment.start
1358 * and segment.stop values based on the SEEK_TYPE. If the
1359 * segment.start value is updated, a seek to this new position
1360 * should be performed.
1362 * The seek can only be executed when we are not currently
1363 * streaming any data, to make sure that this is the case, we
1364 * acquire the STREAM_LOCK which is taken when we are in the
1365 * _loop() function or when a getrange() is called. Normally
1366 * we will not receive a seek if we are operating in pull mode
1367 * though. When we operate as a live source we might block on the live
1368 * cond, which does not release the STREAM_LOCK. Therefore we will try
1369 * to grab the LIVE_LOCK instead of the STREAM_LOCK to make sure it is
1370 * safe to perform the seek.
1372 * When we are in the loop() function, we might be in the middle
1373 * of pushing a buffer, which might block in a sink. To make sure
1374 * that the push gets unblocked we push out a FLUSH_START event.
1375 * Our loop function will get a WRONG_STATE return value from
1376 * the push and will pause, effectively releasing the STREAM_LOCK.
1378 * For a non-flushing seek, we pause the task, which might eventually
1379 * release the STREAM_LOCK. We say eventually because when the sink
1380 * blocks on the sample we might wait a very long time until the sink
1381 * unblocks the sample. In any case we acquire the STREAM_LOCK and
1382 * can continue the seek. A non-flushing seek is normally done in a
1383 * running pipeline to perform seamless playback, this means that the sink is
1384 * PLAYING and will return from its chain function.
1385 * In the case of a non-flushing seek we need to make sure that the
1386 * data we output after the seek is continuous with the previous data,
1387 * this is because a non-flushing seek does not reset the running-time
1388 * to 0. We do this by closing the currently running segment, ie. sending
1389 * a new_segment event with the stop position set to the last processed
1392 * After updating the segment.start/stop values, we prepare for
1393 * streaming again. We push out a FLUSH_STOP to make the peer pad
1394 * accept data again and we start our task again.
1396 * A segment seek posts a message on the bus saying that the playback
1397 * of the segment started. We store the segment flag internally because
1398 * when we reach the segment.stop we have to post a segment.done
1399 * instead of EOS when doing a segment seek.
1401 /* FIXME (0.11), we have the unlock gboolean here because most current
1402 * implementations (fdsrc, -base/gst/tcp/, ...) unconditionally unlock, even when
1403 * the streaming thread isn't running, resulting in bogus unlocks later when it
1404 * starts. This is fixed by adding unlock_stop, but we should still avoid unlocking
1405 * unnecessarily for backwards compatibility. Ergo, the unlock variable stays
1409 gst_base_src_perform_seek (GstBaseSrc * src, GstEvent * event, gboolean unlock)
1411 gboolean res = TRUE, tres;
1413 GstFormat seek_format, dest_format;
1415 GstSeekType cur_type, stop_type;
1417 gboolean flush, playing;
1419 gboolean relative_seek = FALSE;
1420 gboolean seekseg_configured = FALSE;
1421 GstSegment seeksegment;
1425 GST_DEBUG_OBJECT (src, "doing seek: %" GST_PTR_FORMAT, event);
1427 GST_OBJECT_LOCK (src);
1428 dest_format = src->segment.format;
1429 GST_OBJECT_UNLOCK (src);
1432 gst_event_parse_seek (event, &rate, &seek_format, &flags,
1433 &cur_type, &cur, &stop_type, &stop);
1435 relative_seek = SEEK_TYPE_IS_RELATIVE (cur_type) ||
1436 SEEK_TYPE_IS_RELATIVE (stop_type);
1438 if (dest_format != seek_format && !relative_seek) {
1439 /* If we have an ABSOLUTE position (SEEK_SET only), we can convert it
1440 * here before taking the stream lock, otherwise we must convert it later,
1441 * once we have the stream lock and can read the last configures segment
1442 * start and stop positions */
1443 gst_segment_init (&seeksegment, dest_format);
1445 if (!gst_base_src_prepare_seek_segment (src, event, &seeksegment))
1446 goto prepare_failed;
1448 seekseg_configured = TRUE;
1451 flush = flags & GST_SEEK_FLAG_FLUSH;
1452 seqnum = gst_event_get_seqnum (event);
1455 /* get next seqnum */
1456 seqnum = gst_util_seqnum_next ();
1459 /* send flush start */
1461 tevent = gst_event_new_flush_start ();
1462 gst_event_set_seqnum (tevent, seqnum);
1463 gst_pad_push_event (src->srcpad, tevent);
1465 gst_pad_pause_task (src->srcpad);
1467 /* unblock streaming thread. */
1468 gst_base_src_set_flushing (src, TRUE, FALSE, unlock, &playing);
1470 /* grab streaming lock, this should eventually be possible, either
1471 * because the task is paused, our streaming thread stopped
1472 * or because our peer is flushing. */
1473 GST_PAD_STREAM_LOCK (src->srcpad);
1474 if (G_UNLIKELY (src->priv->seqnum == seqnum)) {
1475 /* we have seen this event before, issue a warning for now */
1476 GST_WARNING_OBJECT (src, "duplicate event found %" G_GUINT32_FORMAT,
1479 src->priv->seqnum = seqnum;
1480 GST_DEBUG_OBJECT (src, "seek with seqnum %" G_GUINT32_FORMAT, seqnum);
1483 gst_base_src_set_flushing (src, FALSE, playing, unlock, NULL);
1485 /* If we configured the seeksegment above, don't overwrite it now. Otherwise
1486 * copy the current segment info into the temp segment that we can actually
1487 * attempt the seek with. We only update the real segment if the seek succeeds. */
1488 if (!seekseg_configured) {
1489 memcpy (&seeksegment, &src->segment, sizeof (GstSegment));
1491 /* now configure the final seek segment */
1493 if (seeksegment.format != seek_format) {
1494 /* OK, here's where we give the subclass a chance to convert the relative
1495 * seek into an absolute one in the processing format. We set up any
1496 * absolute seek above, before taking the stream lock. */
1497 if (!gst_base_src_prepare_seek_segment (src, event, &seeksegment)) {
1498 GST_DEBUG_OBJECT (src, "Preparing the seek failed after flushing. "
1503 /* The seek format matches our processing format, no need to ask the
1504 * the subclass to configure the segment. */
1505 gst_segment_do_seek (&seeksegment, rate, seek_format, flags,
1506 cur_type, cur, stop_type, stop, &update);
1509 /* Else, no seek event passed, so we're just (re)starting the
1514 GST_DEBUG_OBJECT (src, "segment configured from %" G_GINT64_FORMAT
1515 " to %" G_GINT64_FORMAT ", position %" G_GINT64_FORMAT,
1516 seeksegment.start, seeksegment.stop, seeksegment.position);
1518 /* do the seek, segment.position contains the new position. */
1519 res = gst_base_src_do_seek (src, &seeksegment);
1522 /* and prepare to continue streaming */
1524 tevent = gst_event_new_flush_stop (TRUE);
1525 gst_event_set_seqnum (tevent, seqnum);
1526 /* send flush stop, peer will accept data and events again. We
1527 * are not yet providing data as we still have the STREAM_LOCK. */
1528 gst_pad_push_event (src->srcpad, tevent);
1531 /* The subclass must have converted the segment to the processing format
1533 if (res && seeksegment.format != dest_format) {
1534 GST_DEBUG_OBJECT (src, "Subclass failed to prepare a seek segment "
1535 "in the correct format. Aborting seek.");
1539 /* if the seek was successful, we update our real segment and push
1540 * out the new segment. */
1542 GST_OBJECT_LOCK (src);
1543 memcpy (&src->segment, &seeksegment, sizeof (GstSegment));
1544 GST_OBJECT_UNLOCK (src);
1546 if (seeksegment.flags & GST_SEEK_FLAG_SEGMENT) {
1547 GstMessage *message;
1549 message = gst_message_new_segment_start (GST_OBJECT (src),
1550 seeksegment.format, seeksegment.position);
1551 gst_message_set_seqnum (message, seqnum);
1553 gst_element_post_message (GST_ELEMENT (src), message);
1556 /* for deriving a stop position for the playback segment from the seek
1557 * segment, we must take the duration when the stop is not set */
1558 if ((stop = seeksegment.stop) == -1)
1559 stop = seeksegment.duration;
1561 src->priv->segment_pending = TRUE;
1564 src->priv->discont = TRUE;
1565 src->running = TRUE;
1566 /* and restart the task in case it got paused explicitly or by
1567 * the FLUSH_START event we pushed out. */
1568 tres = gst_pad_start_task (src->srcpad, (GstTaskFunction) gst_base_src_loop,
1573 /* and release the lock again so we can continue streaming */
1574 GST_PAD_STREAM_UNLOCK (src->srcpad);
1580 GST_DEBUG_OBJECT (src, "Preparing the seek failed before flushing. "
1585 /* all events send to this element directly. This is mainly done from the
1589 gst_base_src_send_event (GstElement * element, GstEvent * event)
1592 gboolean result = FALSE;
1594 src = GST_BASE_SRC (element);
1596 GST_DEBUG_OBJECT (src, "handling event %p %" GST_PTR_FORMAT, event, event);
1598 switch (GST_EVENT_TYPE (event)) {
1599 /* bidirectional events */
1600 case GST_EVENT_FLUSH_START:
1601 case GST_EVENT_FLUSH_STOP:
1602 /* sending random flushes downstream can break stuff,
1603 * especially sync since all segment info will get flushed */
1606 /* downstream serialized events */
1609 GstBaseSrcClass *bclass;
1611 bclass = GST_BASE_SRC_GET_CLASS (src);
1613 /* queue EOS and make sure the task or pull function performs the EOS
1616 * We have two possibilities:
1618 * - Before we are to enter the _create function, we check the pending_eos
1619 * first and do EOS instead of entering it.
1620 * - If we are in the _create function or we did not manage to set the
1621 * flag fast enough and we are about to enter the _create function,
1622 * we unlock it so that we exit with WRONG_STATE immediately. We then
1623 * check the EOS flag and do the EOS logic.
1625 g_atomic_int_set (&src->priv->pending_eos, TRUE);
1626 GST_DEBUG_OBJECT (src, "EOS marked, calling unlock");
1629 /* unlock the _create function so that we can check the pending_eos flag
1630 * and we can do EOS. This will eventually release the LIVE_LOCK again so
1631 * that we can grab it and stop the unlock again. We don't take the stream
1632 * lock so that this operation is guaranteed to never block. */
1633 gst_base_src_activate_pool (src, FALSE);
1635 bclass->unlock (src);
1637 GST_DEBUG_OBJECT (src, "unlock called, waiting for LIVE_LOCK");
1639 GST_LIVE_LOCK (src);
1640 GST_DEBUG_OBJECT (src, "LIVE_LOCK acquired, calling unlock_stop");
1641 /* now stop the unlock of the streaming thread again. Grabbing the live
1642 * lock is enough because that protects the create function. */
1643 if (bclass->unlock_stop)
1644 bclass->unlock_stop (src);
1645 gst_base_src_activate_pool (src, TRUE);
1646 GST_LIVE_UNLOCK (src);
1651 case GST_EVENT_SEGMENT:
1652 /* sending random SEGMENT downstream can break sync. */
1655 case GST_EVENT_CUSTOM_DOWNSTREAM:
1656 case GST_EVENT_CUSTOM_BOTH:
1657 /* Insert TAG, CUSTOM_DOWNSTREAM, CUSTOM_BOTH in the dataflow */
1658 GST_OBJECT_LOCK (src);
1659 src->priv->pending_events =
1660 g_list_append (src->priv->pending_events, event);
1661 g_atomic_int_set (&src->priv->have_events, TRUE);
1662 GST_OBJECT_UNLOCK (src);
1666 case GST_EVENT_BUFFERSIZE:
1667 /* does not seem to make much sense currently */
1670 /* upstream events */
1672 /* elements should override send_event and do something */
1674 case GST_EVENT_SEEK:
1678 GST_OBJECT_LOCK (src->srcpad);
1679 if (GST_PAD_MODE (src->srcpad) == GST_PAD_MODE_PULL)
1681 started = GST_PAD_MODE (src->srcpad) == GST_PAD_MODE_PUSH;
1682 GST_OBJECT_UNLOCK (src->srcpad);
1685 GST_DEBUG_OBJECT (src, "performing seek");
1686 /* when we are running in push mode, we can execute the
1687 * seek right now, we need to unlock. */
1688 result = gst_base_src_perform_seek (src, event, TRUE);
1692 /* else we store the event and execute the seek when we
1694 GST_OBJECT_LOCK (src);
1695 GST_DEBUG_OBJECT (src, "queueing seek");
1696 event_p = &src->pending_seek;
1697 gst_event_replace ((GstEvent **) event_p, event);
1698 GST_OBJECT_UNLOCK (src);
1699 /* assume the seek will work */
1704 case GST_EVENT_NAVIGATION:
1705 /* could make sense for elements that do something with navigation events
1706 * but then they would need to override the send_event function */
1708 case GST_EVENT_LATENCY:
1709 /* does not seem to make sense currently */
1713 case GST_EVENT_CUSTOM_UPSTREAM:
1714 /* override send_event if you want this */
1716 case GST_EVENT_CUSTOM_DOWNSTREAM_OOB:
1717 case GST_EVENT_CUSTOM_BOTH_OOB:
1718 /* insert a random custom event into the pipeline */
1719 GST_DEBUG_OBJECT (src, "pushing custom OOB event downstream");
1720 result = gst_pad_push_event (src->srcpad, event);
1721 /* we gave away the ref to the event in the push */
1728 /* if we still have a ref to the event, unref it now */
1730 gst_event_unref (event);
1737 GST_DEBUG_OBJECT (src, "cannot perform seek when operating in pull mode");
1738 GST_OBJECT_UNLOCK (src->srcpad);
1745 gst_base_src_seekable (GstBaseSrc * src)
1747 GstBaseSrcClass *bclass;
1748 bclass = GST_BASE_SRC_GET_CLASS (src);
1749 if (bclass->is_seekable)
1750 return bclass->is_seekable (src);
1756 gst_base_src_update_qos (GstBaseSrc * src,
1757 gdouble proportion, GstClockTimeDiff diff, GstClockTime timestamp)
1759 GST_CAT_DEBUG_OBJECT (GST_CAT_QOS, src,
1760 "qos: proportion: %lf, diff %" G_GINT64_FORMAT ", timestamp %"
1761 GST_TIME_FORMAT, proportion, diff, GST_TIME_ARGS (timestamp));
1763 GST_OBJECT_LOCK (src);
1764 src->priv->proportion = proportion;
1765 src->priv->earliest_time = timestamp + diff;
1766 GST_OBJECT_UNLOCK (src);
1771 gst_base_src_default_event (GstBaseSrc * src, GstEvent * event)
1775 GST_DEBUG_OBJECT (src, "handle event %" GST_PTR_FORMAT, event);
1777 switch (GST_EVENT_TYPE (event)) {
1778 case GST_EVENT_SEEK:
1779 /* is normally called when in push mode */
1780 if (!gst_base_src_seekable (src))
1783 result = gst_base_src_perform_seek (src, event, TRUE);
1785 case GST_EVENT_FLUSH_START:
1786 /* cancel any blocking getrange, is normally called
1787 * when in pull mode. */
1788 result = gst_base_src_set_flushing (src, TRUE, FALSE, TRUE, NULL);
1790 case GST_EVENT_FLUSH_STOP:
1791 result = gst_base_src_set_flushing (src, FALSE, TRUE, TRUE, NULL);
1796 GstClockTimeDiff diff;
1797 GstClockTime timestamp;
1799 gst_event_parse_qos (event, NULL, &proportion, &diff, ×tamp);
1800 gst_base_src_update_qos (src, proportion, diff, timestamp);
1813 GST_DEBUG_OBJECT (src, "is not seekable");
1819 gst_base_src_event (GstPad * pad, GstObject * parent, GstEvent * event)
1822 GstBaseSrcClass *bclass;
1823 gboolean result = FALSE;
1825 src = GST_BASE_SRC (parent);
1826 bclass = GST_BASE_SRC_GET_CLASS (src);
1828 if (bclass->event) {
1829 if (!(result = bclass->event (src, event)))
1830 goto subclass_failed;
1834 gst_event_unref (event);
1841 GST_DEBUG_OBJECT (src, "subclass refused event");
1847 gst_base_src_set_property (GObject * object, guint prop_id,
1848 const GValue * value, GParamSpec * pspec)
1852 src = GST_BASE_SRC (object);
1855 case PROP_BLOCKSIZE:
1856 gst_base_src_set_blocksize (src, g_value_get_uint (value));
1858 case PROP_NUM_BUFFERS:
1859 src->num_buffers = g_value_get_int (value);
1862 src->typefind = g_value_get_boolean (value);
1864 case PROP_DO_TIMESTAMP:
1865 gst_base_src_set_do_timestamp (src, g_value_get_boolean (value));
1868 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
1874 gst_base_src_get_property (GObject * object, guint prop_id, GValue * value,
1879 src = GST_BASE_SRC (object);
1882 case PROP_BLOCKSIZE:
1883 g_value_set_uint (value, gst_base_src_get_blocksize (src));
1885 case PROP_NUM_BUFFERS:
1886 g_value_set_int (value, src->num_buffers);
1889 g_value_set_boolean (value, src->typefind);
1891 case PROP_DO_TIMESTAMP:
1892 g_value_set_boolean (value, gst_base_src_get_do_timestamp (src));
1895 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
1900 /* with STREAM_LOCK and LOCK */
1901 static GstClockReturn
1902 gst_base_src_wait (GstBaseSrc * basesrc, GstClock * clock, GstClockTime time)
1907 id = gst_clock_new_single_shot_id (clock, time);
1909 basesrc->clock_id = id;
1910 /* release the live lock while waiting */
1911 GST_LIVE_UNLOCK (basesrc);
1913 ret = gst_clock_id_wait (id, NULL);
1915 GST_LIVE_LOCK (basesrc);
1916 gst_clock_id_unref (id);
1917 basesrc->clock_id = NULL;
1922 /* perform synchronisation on a buffer.
1925 static GstClockReturn
1926 gst_base_src_do_sync (GstBaseSrc * basesrc, GstBuffer * buffer)
1928 GstClockReturn result;
1929 GstClockTime start, end;
1930 GstBaseSrcClass *bclass;
1931 GstClockTime base_time;
1933 GstClockTime now = GST_CLOCK_TIME_NONE, timestamp;
1934 gboolean do_timestamp, first, pseudo_live;
1936 bclass = GST_BASE_SRC_GET_CLASS (basesrc);
1939 if (bclass->get_times)
1940 bclass->get_times (basesrc, buffer, &start, &end);
1942 /* get buffer timestamp */
1943 timestamp = GST_BUFFER_TIMESTAMP (buffer);
1945 /* grab the lock to prepare for clocking and calculate the startup
1947 GST_OBJECT_LOCK (basesrc);
1949 /* if we are asked to sync against the clock we are a pseudo live element */
1950 pseudo_live = (start != -1 && basesrc->is_live);
1951 /* check for the first buffer */
1952 first = (basesrc->priv->latency == -1);
1954 if (timestamp != -1 && pseudo_live) {
1955 GstClockTime latency;
1957 /* we have a timestamp and a sync time, latency is the diff */
1958 if (timestamp <= start)
1959 latency = start - timestamp;
1964 GST_DEBUG_OBJECT (basesrc, "pseudo_live with latency %" GST_TIME_FORMAT,
1965 GST_TIME_ARGS (latency));
1966 /* first time we calculate latency, just configure */
1967 basesrc->priv->latency = latency;
1969 if (basesrc->priv->latency != latency) {
1970 /* we have a new latency, FIXME post latency message */
1971 basesrc->priv->latency = latency;
1972 GST_DEBUG_OBJECT (basesrc, "latency changed to %" GST_TIME_FORMAT,
1973 GST_TIME_ARGS (latency));
1977 GST_DEBUG_OBJECT (basesrc, "no latency needed, live %d, sync %d",
1978 basesrc->is_live, start != -1);
1979 basesrc->priv->latency = 0;
1982 /* get clock, if no clock, we can't sync or do timestamps */
1983 if ((clock = GST_ELEMENT_CLOCK (basesrc)) == NULL)
1986 base_time = GST_ELEMENT_CAST (basesrc)->base_time;
1988 do_timestamp = basesrc->priv->do_timestamp;
1990 /* first buffer, calculate the timestamp offset */
1992 GstClockTime running_time;
1994 now = gst_clock_get_time (clock);
1995 running_time = now - base_time;
1997 GST_LOG_OBJECT (basesrc,
1998 "startup timestamp: %" GST_TIME_FORMAT ", running_time %"
1999 GST_TIME_FORMAT, GST_TIME_ARGS (timestamp),
2000 GST_TIME_ARGS (running_time));
2002 if (pseudo_live && timestamp != -1) {
2003 /* live source and we need to sync, add startup latency to all timestamps
2004 * to get the real running_time. Live sources should always timestamp
2005 * according to the current running time. */
2006 basesrc->priv->ts_offset = GST_CLOCK_DIFF (timestamp, running_time);
2008 GST_LOG_OBJECT (basesrc, "live with sync, ts_offset %" GST_TIME_FORMAT,
2009 GST_TIME_ARGS (basesrc->priv->ts_offset));
2011 basesrc->priv->ts_offset = 0;
2012 GST_LOG_OBJECT (basesrc, "no timestamp offset needed");
2015 if (!GST_CLOCK_TIME_IS_VALID (timestamp)) {
2017 timestamp = running_time;
2021 GST_BUFFER_TIMESTAMP (buffer) = timestamp;
2023 GST_LOG_OBJECT (basesrc, "created timestamp: %" GST_TIME_FORMAT,
2024 GST_TIME_ARGS (timestamp));
2027 /* add the timestamp offset we need for sync */
2028 timestamp += basesrc->priv->ts_offset;
2030 /* not the first buffer, the timestamp is the diff between the clock and
2032 if (do_timestamp && !GST_CLOCK_TIME_IS_VALID (timestamp)) {
2033 now = gst_clock_get_time (clock);
2035 GST_BUFFER_TIMESTAMP (buffer) = now - base_time;
2037 GST_LOG_OBJECT (basesrc, "created timestamp: %" GST_TIME_FORMAT,
2038 GST_TIME_ARGS (now - base_time));
2042 /* if we don't have a buffer timestamp, we don't sync */
2043 if (!GST_CLOCK_TIME_IS_VALID (start))
2046 if (basesrc->is_live && GST_CLOCK_TIME_IS_VALID (timestamp)) {
2047 /* for pseudo live sources, add our ts_offset to the timestamp */
2048 GST_BUFFER_TIMESTAMP (buffer) += basesrc->priv->ts_offset;
2049 start += basesrc->priv->ts_offset;
2052 GST_LOG_OBJECT (basesrc,
2053 "waiting for clock, base time %" GST_TIME_FORMAT
2054 ", stream_start %" GST_TIME_FORMAT,
2055 GST_TIME_ARGS (base_time), GST_TIME_ARGS (start));
2056 GST_OBJECT_UNLOCK (basesrc);
2058 result = gst_base_src_wait (basesrc, clock, start + base_time);
2060 GST_LOG_OBJECT (basesrc, "clock entry done: %d", result);
2067 GST_DEBUG_OBJECT (basesrc, "we have no clock");
2068 GST_OBJECT_UNLOCK (basesrc);
2069 return GST_CLOCK_OK;
2073 GST_DEBUG_OBJECT (basesrc, "no sync needed");
2074 GST_OBJECT_UNLOCK (basesrc);
2075 return GST_CLOCK_OK;
2079 /* Called with STREAM_LOCK and LIVE_LOCK */
2081 gst_base_src_update_length (GstBaseSrc * src, guint64 offset, guint * length)
2083 guint64 size, maxsize;
2084 GstBaseSrcClass *bclass;
2089 bclass = GST_BASE_SRC_GET_CLASS (src);
2091 format = src->segment.format;
2092 stop = src->segment.stop;
2093 /* get total file size */
2094 size = src->segment.duration;
2096 /* only operate if we are working with bytes */
2097 if (format != GST_FORMAT_BYTES)
2100 /* the max amount of bytes to read is the total size or
2101 * up to the segment.stop if present. */
2103 maxsize = MIN (size, stop);
2107 GST_DEBUG_OBJECT (src,
2108 "reading offset %" G_GUINT64_FORMAT ", length %u, size %" G_GINT64_FORMAT
2109 ", segment.stop %" G_GINT64_FORMAT ", maxsize %" G_GINT64_FORMAT, offset,
2110 *length, size, stop, maxsize);
2112 dynamic = g_atomic_int_get (&src->priv->dynamic_size);
2113 GST_DEBUG_OBJECT (src, "dynamic size: %d", dynamic);
2115 /* check size if we have one */
2116 if (maxsize != -1) {
2117 /* if we run past the end, check if the file became bigger and
2119 if (G_UNLIKELY (offset + *length >= maxsize || dynamic)) {
2120 /* see if length of the file changed */
2121 if (bclass->get_size)
2122 if (!bclass->get_size (src, &size))
2125 /* make sure we don't exceed the configured segment stop
2128 maxsize = MIN (size, stop);
2132 /* if we are at or past the end, EOS */
2133 if (G_UNLIKELY (offset >= maxsize))
2134 goto unexpected_length;
2136 /* else we can clip to the end */
2137 if (G_UNLIKELY (offset + *length >= maxsize))
2138 *length = maxsize - offset;
2143 /* keep track of current duration.
2144 * segment is in bytes, we checked that above. */
2145 GST_OBJECT_LOCK (src);
2146 src->segment.duration = size;
2147 GST_OBJECT_UNLOCK (src);
2158 /* must be called with LIVE_LOCK */
2159 static GstFlowReturn
2160 gst_base_src_get_range (GstBaseSrc * src, guint64 offset, guint length,
2164 GstBaseSrcClass *bclass;
2165 GstClockReturn status;
2167 bclass = GST_BASE_SRC_GET_CLASS (src);
2171 if (G_UNLIKELY (!src->live_running)) {
2172 ret = gst_base_src_wait_playing (src);
2173 if (ret != GST_FLOW_OK)
2178 if (G_UNLIKELY (!GST_OBJECT_FLAG_IS_SET (src, GST_BASE_SRC_STARTED)))
2181 if (G_UNLIKELY (!bclass->create))
2184 if (G_UNLIKELY (!gst_base_src_update_length (src, offset, &length)))
2185 goto unexpected_length;
2187 /* track position */
2188 GST_OBJECT_LOCK (src);
2189 if (src->segment.format == GST_FORMAT_BYTES)
2190 src->segment.position = offset;
2191 GST_OBJECT_UNLOCK (src);
2193 /* normally we don't count buffers */
2194 if (G_UNLIKELY (src->num_buffers_left >= 0)) {
2195 if (src->num_buffers_left == 0)
2196 goto reached_num_buffers;
2198 src->num_buffers_left--;
2201 /* don't enter the create function if a pending EOS event was set. For the
2202 * logic of the pending_eos, check the event function of this class. */
2203 if (G_UNLIKELY (g_atomic_int_get (&src->priv->pending_eos)))
2206 GST_DEBUG_OBJECT (src,
2207 "calling create offset %" G_GUINT64_FORMAT " length %u, time %"
2208 G_GINT64_FORMAT, offset, length, src->segment.time);
2210 ret = bclass->create (src, offset, length, buf);
2212 /* The create function could be unlocked because we have a pending EOS. It's
2213 * possible that we have a valid buffer from create that we need to
2214 * discard when the create function returned _OK. */
2215 if (G_UNLIKELY (g_atomic_int_get (&src->priv->pending_eos))) {
2216 if (ret == GST_FLOW_OK) {
2217 gst_buffer_unref (*buf);
2223 if (G_UNLIKELY (ret != GST_FLOW_OK))
2226 /* no timestamp set and we are at offset 0, we can timestamp with 0 */
2227 if (offset == 0 && src->segment.time == 0
2228 && GST_BUFFER_TIMESTAMP (*buf) == -1 && !src->is_live) {
2229 *buf = gst_buffer_make_writable (*buf);
2230 GST_BUFFER_TIMESTAMP (*buf) = 0;
2233 /* now sync before pushing the buffer */
2234 status = gst_base_src_do_sync (src, *buf);
2236 /* waiting for the clock could have made us flushing */
2237 if (G_UNLIKELY (src->priv->flushing))
2241 case GST_CLOCK_EARLY:
2242 /* the buffer is too late. We currently don't drop the buffer. */
2243 GST_DEBUG_OBJECT (src, "buffer too late!, returning anyway");
2246 /* buffer synchronised properly */
2247 GST_DEBUG_OBJECT (src, "buffer ok");
2249 case GST_CLOCK_UNSCHEDULED:
2250 /* this case is triggered when we were waiting for the clock and
2251 * it got unlocked because we did a state change. In any case, get rid of
2253 gst_buffer_unref (*buf);
2255 if (!src->live_running) {
2256 /* We return WRONG_STATE when we are not running to stop the dataflow also
2257 * get rid of the produced buffer. */
2258 GST_DEBUG_OBJECT (src,
2259 "clock was unscheduled (%d), returning WRONG_STATE", status);
2260 ret = GST_FLOW_WRONG_STATE;
2262 /* If we are running when this happens, we quickly switched between
2263 * pause and playing. We try to produce a new buffer */
2264 GST_DEBUG_OBJECT (src,
2265 "clock was unscheduled (%d), but we are running", status);
2270 /* all other result values are unexpected and errors */
2271 GST_ELEMENT_ERROR (src, CORE, CLOCK,
2272 (_("Internal clock error.")),
2273 ("clock returned unexpected return value %d", status));
2274 gst_buffer_unref (*buf);
2276 ret = GST_FLOW_ERROR;
2284 GST_DEBUG_OBJECT (src, "wait_playing returned %d (%s)", ret,
2285 gst_flow_get_name (ret));
2290 GST_DEBUG_OBJECT (src, "create returned %d (%s)", ret,
2291 gst_flow_get_name (ret));
2296 GST_DEBUG_OBJECT (src, "getrange but not started");
2297 return GST_FLOW_WRONG_STATE;
2301 GST_DEBUG_OBJECT (src, "no create function");
2302 return GST_FLOW_NOT_SUPPORTED;
2306 GST_DEBUG_OBJECT (src, "unexpected length %u (offset=%" G_GUINT64_FORMAT
2307 ", size=%" G_GINT64_FORMAT ")", length, offset, src->segment.duration);
2308 return GST_FLOW_EOS;
2310 reached_num_buffers:
2312 GST_DEBUG_OBJECT (src, "sent all buffers");
2313 return GST_FLOW_EOS;
2317 GST_DEBUG_OBJECT (src, "we are flushing");
2318 gst_buffer_unref (*buf);
2320 return GST_FLOW_WRONG_STATE;
2324 GST_DEBUG_OBJECT (src, "we are EOS");
2325 return GST_FLOW_EOS;
2329 static GstFlowReturn
2330 gst_base_src_getrange (GstPad * pad, GstObject * parent, guint64 offset,
2331 guint length, GstBuffer ** buf)
2336 src = GST_BASE_SRC_CAST (parent);
2338 GST_LIVE_LOCK (src);
2339 if (G_UNLIKELY (src->priv->flushing))
2342 res = gst_base_src_get_range (src, offset, length, buf);
2345 GST_LIVE_UNLOCK (src);
2352 GST_DEBUG_OBJECT (src, "we are flushing");
2353 res = GST_FLOW_WRONG_STATE;
2359 gst_base_src_is_random_access (GstBaseSrc * src)
2361 /* we need to start the basesrc to check random access */
2362 if (!GST_OBJECT_FLAG_IS_SET (src, GST_BASE_SRC_STARTED)) {
2363 GST_LOG_OBJECT (src, "doing start/stop to check get_range support");
2364 if (G_LIKELY (gst_base_src_start (src)))
2365 gst_base_src_stop (src);
2368 return src->random_access;
2372 gst_base_src_loop (GstPad * pad)
2375 GstBuffer *buf = NULL;
2380 GList *pending_events = NULL, *tmp;
2384 src = GST_BASE_SRC (GST_OBJECT_PARENT (pad));
2386 /* check if we need to renegotiate */
2387 if (gst_pad_check_reconfigure (pad)) {
2388 if (!gst_base_src_negotiate (src))
2389 GST_DEBUG_OBJECT (src, "Failed to renegotiate");
2392 GST_LIVE_LOCK (src);
2394 if (G_UNLIKELY (src->priv->flushing))
2397 blocksize = src->blocksize;
2399 /* if we operate in bytes, we can calculate an offset */
2400 if (src->segment.format == GST_FORMAT_BYTES) {
2401 position = src->segment.position;
2402 /* for negative rates, start with subtracting the blocksize */
2403 if (src->segment.rate < 0.0) {
2404 /* we cannot go below segment.start */
2405 if (position > src->segment.start + blocksize)
2406 position -= blocksize;
2408 /* last block, remainder up to segment.start */
2409 blocksize = position - src->segment.start;
2410 position = src->segment.start;
2416 GST_LOG_OBJECT (src, "next_ts %" GST_TIME_FORMAT " size %u",
2417 GST_TIME_ARGS (position), blocksize);
2419 ret = gst_base_src_get_range (src, position, blocksize, &buf);
2420 if (G_UNLIKELY (ret != GST_FLOW_OK)) {
2421 GST_INFO_OBJECT (src, "pausing after gst_base_src_get_range() = %s",
2422 gst_flow_get_name (ret));
2423 GST_LIVE_UNLOCK (src);
2426 /* this should not happen */
2427 if (G_UNLIKELY (buf == NULL))
2430 /* push events to close/start our segment before we push the buffer. */
2431 if (G_UNLIKELY (src->priv->segment_pending)) {
2432 gst_pad_push_event (pad, gst_event_new_segment (&src->segment));
2433 src->priv->segment_pending = FALSE;
2436 if (g_atomic_int_get (&src->priv->have_events)) {
2437 GST_OBJECT_LOCK (src);
2438 /* take the events */
2439 pending_events = src->priv->pending_events;
2440 src->priv->pending_events = NULL;
2441 g_atomic_int_set (&src->priv->have_events, FALSE);
2442 GST_OBJECT_UNLOCK (src);
2445 /* Push out pending events if any */
2446 if (G_UNLIKELY (pending_events != NULL)) {
2447 for (tmp = pending_events; tmp; tmp = g_list_next (tmp)) {
2448 GstEvent *ev = (GstEvent *) tmp->data;
2449 gst_pad_push_event (pad, ev);
2451 g_list_free (pending_events);
2454 /* figure out the new position */
2455 switch (src->segment.format) {
2456 case GST_FORMAT_BYTES:
2458 guint bufsize = gst_buffer_get_size (buf);
2460 /* we subtracted above for negative rates */
2461 if (src->segment.rate >= 0.0)
2462 position += bufsize;
2465 case GST_FORMAT_TIME:
2467 GstClockTime start, duration;
2469 start = GST_BUFFER_TIMESTAMP (buf);
2470 duration = GST_BUFFER_DURATION (buf);
2472 if (GST_CLOCK_TIME_IS_VALID (start))
2475 position = src->segment.position;
2477 if (GST_CLOCK_TIME_IS_VALID (duration)) {
2478 if (src->segment.rate >= 0.0)
2479 position += duration;
2480 else if (position > duration)
2481 position -= duration;
2487 case GST_FORMAT_DEFAULT:
2488 if (src->segment.rate >= 0.0)
2489 position = GST_BUFFER_OFFSET_END (buf);
2491 position = GST_BUFFER_OFFSET (buf);
2497 if (position != -1) {
2498 if (src->segment.rate >= 0.0) {
2499 /* positive rate, check if we reached the stop */
2500 if (src->segment.stop != -1) {
2501 if (position >= src->segment.stop) {
2503 position = src->segment.stop;
2507 /* negative rate, check if we reached the start. start is always set to
2508 * something different from -1 */
2509 if (position <= src->segment.start) {
2511 position = src->segment.start;
2513 /* when going reverse, all buffers are DISCONT */
2514 src->priv->discont = TRUE;
2516 GST_OBJECT_LOCK (src);
2517 src->segment.position = position;
2518 GST_OBJECT_UNLOCK (src);
2521 if (G_UNLIKELY (src->priv->discont)) {
2522 buf = gst_buffer_make_writable (buf);
2523 GST_BUFFER_FLAG_SET (buf, GST_BUFFER_FLAG_DISCONT);
2524 src->priv->discont = FALSE;
2526 GST_LIVE_UNLOCK (src);
2528 ret = gst_pad_push (pad, buf);
2529 if (G_UNLIKELY (ret != GST_FLOW_OK)) {
2530 GST_INFO_OBJECT (src, "pausing after gst_pad_push() = %s",
2531 gst_flow_get_name (ret));
2535 if (G_UNLIKELY (eos)) {
2536 GST_INFO_OBJECT (src, "pausing after end of segment");
2547 GST_DEBUG_OBJECT (src, "we are flushing");
2548 GST_LIVE_UNLOCK (src);
2549 ret = GST_FLOW_WRONG_STATE;
2554 const gchar *reason = gst_flow_get_name (ret);
2557 GST_DEBUG_OBJECT (src, "pausing task, reason %s", reason);
2558 src->running = FALSE;
2559 gst_pad_pause_task (pad);
2560 if (ret == GST_FLOW_EOS) {
2561 gboolean flag_segment;
2565 /* perform EOS logic */
2566 flag_segment = (src->segment.flags & GST_SEEK_FLAG_SEGMENT) != 0;
2567 format = src->segment.format;
2568 position = src->segment.position;
2571 GstMessage *message;
2573 message = gst_message_new_segment_done (GST_OBJECT_CAST (src),
2575 gst_message_set_seqnum (message, src->priv->seqnum);
2576 gst_element_post_message (GST_ELEMENT_CAST (src), message);
2578 event = gst_event_new_eos ();
2579 gst_event_set_seqnum (event, src->priv->seqnum);
2580 gst_pad_push_event (pad, event);
2582 } else if (ret == GST_FLOW_NOT_LINKED || ret <= GST_FLOW_EOS) {
2583 event = gst_event_new_eos ();
2584 gst_event_set_seqnum (event, src->priv->seqnum);
2585 /* for fatal errors we post an error message, post the error
2586 * first so the app knows about the error first.
2587 * Also don't do this for WRONG_STATE because it happens
2588 * due to flushing and posting an error message because of
2589 * that is the wrong thing to do, e.g. when we're doing
2590 * a flushing seek. */
2591 GST_ELEMENT_ERROR (src, STREAM, FAILED,
2592 (_("Internal data flow error.")),
2593 ("streaming task paused, reason %s (%d)", reason, ret));
2594 gst_pad_push_event (pad, event);
2600 GST_ELEMENT_ERROR (src, STREAM, FAILED,
2601 (_("Internal data flow error.")), ("element returned NULL buffer"));
2602 GST_LIVE_UNLOCK (src);
2608 gst_base_src_set_allocation (GstBaseSrc * basesrc, GstBufferPool * pool,
2609 const GstAllocator * allocator, guint prefix, guint alignment)
2611 GstBufferPool *oldpool;
2612 GstBaseSrcPrivate *priv = basesrc->priv;
2615 GST_DEBUG_OBJECT (basesrc, "activate pool");
2616 if (!gst_buffer_pool_set_active (pool, TRUE))
2617 goto activate_failed;
2620 GST_OBJECT_LOCK (basesrc);
2621 oldpool = priv->pool;
2624 priv->allocator = allocator;
2626 priv->prefix = prefix;
2627 priv->alignment = alignment;
2628 GST_OBJECT_UNLOCK (basesrc);
2631 /* only deactivate if the pool is not the one we're using */
2632 if (oldpool != pool) {
2633 GST_DEBUG_OBJECT (basesrc, "deactivate old pool");
2634 gst_buffer_pool_set_active (oldpool, FALSE);
2636 gst_object_unref (oldpool);
2643 GST_ERROR_OBJECT (basesrc, "failed to activate bufferpool.");
2649 gst_base_src_activate_pool (GstBaseSrc * basesrc, gboolean active)
2651 GstBaseSrcPrivate *priv = basesrc->priv;
2652 GstBufferPool *pool;
2653 gboolean res = TRUE;
2655 GST_OBJECT_LOCK (basesrc);
2656 if ((pool = priv->pool))
2657 pool = gst_object_ref (pool);
2658 GST_OBJECT_UNLOCK (basesrc);
2661 res = gst_buffer_pool_set_active (pool, active);
2662 gst_object_unref (pool);
2668 gst_base_src_prepare_allocation (GstBaseSrc * basesrc, GstCaps * caps)
2670 GstBaseSrcClass *bclass;
2671 gboolean result = TRUE;
2673 GstBufferPool *pool = NULL;
2674 const GstAllocator *allocator = NULL;
2675 guint size, min, max, prefix, alignment;
2677 bclass = GST_BASE_SRC_GET_CLASS (basesrc);
2679 /* make query and let peer pad answer, we don't really care if it worked or
2680 * not, if it failed, the allocation query would contain defaults and the
2681 * subclass would then set better values if needed */
2682 query = gst_query_new_allocation (caps, TRUE);
2683 if (!gst_pad_peer_query (basesrc->srcpad, query)) {
2684 /* not a problem, just debug a little */
2685 GST_DEBUG_OBJECT (basesrc, "peer ALLOCATION query failed");
2688 if (G_LIKELY (bclass->decide_allocation))
2689 result = bclass->decide_allocation (basesrc, query);
2691 GST_DEBUG_OBJECT (basesrc, "ALLOCATION (%d) params: %" GST_PTR_FORMAT, result,
2693 gst_query_parse_allocation_params (query, &size, &min, &max, &prefix,
2697 const gchar *mem = NULL;
2699 /* no size, we have variable size buffers */
2700 if (gst_query_get_n_allocation_memories (query) > 0) {
2701 mem = gst_query_parse_nth_allocation_memory (query, 0);
2703 GST_DEBUG_OBJECT (basesrc, "0 size, getting allocator %s",
2704 GST_STR_NULL (mem));
2705 allocator = gst_allocator_find (mem);
2706 } else if (pool == NULL) {
2707 /* fixed size, we can use a bufferpool */
2708 GstStructure *config;
2710 /* we did not get a pool, make one ourselves then */
2711 pool = gst_buffer_pool_new ();
2712 GST_DEBUG_OBJECT (basesrc, "no pool, making new pool");
2714 config = gst_buffer_pool_get_config (pool);
2715 gst_buffer_pool_config_set (config, caps, size, min, max, prefix,
2717 gst_buffer_pool_set_config (pool, config);
2720 gst_query_unref (query);
2723 gst_base_src_set_allocation (basesrc, pool, allocator, prefix, alignment);
2729 /* default negotiation code.
2731 * Take intersection between src and sink pads, take first
2735 gst_base_src_default_negotiate (GstBaseSrc * basesrc)
2738 GstCaps *caps = NULL;
2739 GstCaps *peercaps = NULL;
2740 gboolean result = FALSE;
2742 /* first see what is possible on our source pad */
2743 thiscaps = gst_pad_query_caps (GST_BASE_SRC_PAD (basesrc), NULL);
2744 GST_DEBUG_OBJECT (basesrc, "caps of src: %" GST_PTR_FORMAT, thiscaps);
2745 /* nothing or anything is allowed, we're done */
2746 if (thiscaps == NULL || gst_caps_is_any (thiscaps))
2747 goto no_nego_needed;
2749 if (G_UNLIKELY (gst_caps_is_empty (thiscaps)))
2752 /* get the peer caps */
2753 peercaps = gst_pad_peer_query_caps (GST_BASE_SRC_PAD (basesrc), thiscaps);
2754 GST_DEBUG_OBJECT (basesrc, "caps of peer: %" GST_PTR_FORMAT, peercaps);
2756 /* The result is already a subset of our caps */
2758 gst_caps_unref (thiscaps);
2760 /* no peer, work with our own caps then */
2763 if (caps && !gst_caps_is_empty (caps)) {
2765 GST_DEBUG_OBJECT (basesrc, "have caps: %" GST_PTR_FORMAT, caps);
2766 if (gst_caps_is_any (caps)) {
2767 GST_DEBUG_OBJECT (basesrc, "any caps, we stop");
2768 /* hmm, still anything, so element can do anything and
2769 * nego is not needed */
2772 caps = gst_caps_make_writable (caps);
2773 gst_base_src_fixate (basesrc, caps);
2774 GST_DEBUG_OBJECT (basesrc, "fixated to: %" GST_PTR_FORMAT, caps);
2775 if (gst_caps_is_fixed (caps)) {
2776 /* yay, fixed caps, use those then, it's possible that the subclass does
2777 * not accept this caps after all and we have to fail. */
2778 result = gst_base_src_set_caps (basesrc, caps);
2781 gst_caps_unref (caps);
2783 GST_DEBUG_OBJECT (basesrc, "no common caps");
2789 GST_DEBUG_OBJECT (basesrc, "no negotiation needed");
2791 gst_caps_unref (thiscaps);
2796 GST_ELEMENT_ERROR (basesrc, STREAM, FORMAT,
2797 ("No supported formats found"),
2798 ("This element did not produce valid caps"));
2800 gst_caps_unref (thiscaps);
2806 gst_base_src_negotiate (GstBaseSrc * basesrc)
2808 GstBaseSrcClass *bclass;
2811 bclass = GST_BASE_SRC_GET_CLASS (basesrc);
2813 GST_DEBUG_OBJECT (basesrc, "starting negotiation");
2815 if (G_LIKELY (bclass->negotiate))
2816 result = bclass->negotiate (basesrc);
2820 if (G_LIKELY (result)) {
2823 caps = gst_pad_get_current_caps (basesrc->srcpad);
2825 result = gst_base_src_prepare_allocation (basesrc, caps);
2828 gst_caps_unref (caps);
2834 gst_base_src_start (GstBaseSrc * basesrc)
2836 GstBaseSrcClass *bclass;
2837 gboolean result, have_size;
2842 if (GST_OBJECT_FLAG_IS_SET (basesrc, GST_BASE_SRC_STARTED))
2845 GST_DEBUG_OBJECT (basesrc, "starting source");
2847 basesrc->num_buffers_left = basesrc->num_buffers;
2849 GST_OBJECT_LOCK (basesrc);
2850 gst_segment_init (&basesrc->segment, basesrc->segment.format);
2851 GST_OBJECT_UNLOCK (basesrc);
2853 basesrc->running = FALSE;
2854 basesrc->priv->segment_pending = FALSE;
2856 bclass = GST_BASE_SRC_GET_CLASS (basesrc);
2858 result = bclass->start (basesrc);
2863 goto could_not_start;
2865 GST_OBJECT_FLAG_SET (basesrc, GST_BASE_SRC_STARTED);
2867 format = basesrc->segment.format;
2869 /* figure out the size */
2872 if (format == GST_FORMAT_BYTES) {
2873 if (bclass->get_size) {
2874 if (!(have_size = bclass->get_size (basesrc, &size)))
2877 GST_DEBUG_OBJECT (basesrc, "setting size %" G_GUINT64_FORMAT, size);
2878 /* only update the size when operating in bytes, subclass is supposed
2879 * to set duration in the start method for other formats */
2880 GST_OBJECT_LOCK (basesrc);
2881 basesrc->segment.duration = size;
2882 GST_OBJECT_UNLOCK (basesrc);
2885 GST_DEBUG_OBJECT (basesrc,
2886 "format: %s, have size: %d, size: %" G_GUINT64_FORMAT ", duration: %"
2887 G_GINT64_FORMAT, gst_format_get_name (format), have_size, size,
2888 basesrc->segment.duration);
2890 seekable = gst_base_src_seekable (basesrc);
2891 GST_DEBUG_OBJECT (basesrc, "is seekable: %d", seekable);
2893 /* update for random access flag */
2894 basesrc->random_access = seekable && format == GST_FORMAT_BYTES;
2896 GST_DEBUG_OBJECT (basesrc, "is random_access: %d", basesrc->random_access);
2898 gst_pad_mark_reconfigure (GST_BASE_SRC_PAD (basesrc));
2905 GST_DEBUG_OBJECT (basesrc, "could not start");
2906 /* subclass is supposed to post a message. We don't have to call _stop. */
2912 gst_base_src_stop (GstBaseSrc * basesrc)
2914 GstBaseSrcClass *bclass;
2915 gboolean result = TRUE;
2917 if (!GST_OBJECT_FLAG_IS_SET (basesrc, GST_BASE_SRC_STARTED))
2920 GST_DEBUG_OBJECT (basesrc, "stopping source");
2922 bclass = GST_BASE_SRC_GET_CLASS (basesrc);
2924 result = bclass->stop (basesrc);
2926 gst_base_src_set_allocation (basesrc, NULL, NULL, 0, 0);
2929 GST_OBJECT_FLAG_UNSET (basesrc, GST_BASE_SRC_STARTED);
2934 /* start or stop flushing dataprocessing
2937 gst_base_src_set_flushing (GstBaseSrc * basesrc,
2938 gboolean flushing, gboolean live_play, gboolean unlock, gboolean * playing)
2940 GstBaseSrcClass *bclass;
2942 bclass = GST_BASE_SRC_GET_CLASS (basesrc);
2944 if (flushing && unlock) {
2945 gst_base_src_activate_pool (basesrc, FALSE);
2946 /* unlock any subclasses, we need to do this before grabbing the
2947 * LIVE_LOCK since we hold this lock before going into ::create. We pass an
2948 * unlock to the params because of backwards compat (see seek handler)*/
2950 bclass->unlock (basesrc);
2953 /* the live lock is released when we are blocked, waiting for playing or
2954 * when we sync to the clock. */
2955 GST_LIVE_LOCK (basesrc);
2957 *playing = basesrc->live_running;
2958 basesrc->priv->flushing = flushing;
2960 /* if we are locked in the live lock, signal it to make it flush */
2961 basesrc->live_running = TRUE;
2963 /* clear pending EOS if any */
2964 g_atomic_int_set (&basesrc->priv->pending_eos, FALSE);
2966 /* step 1, now that we have the LIVE lock, clear our unlock request */
2967 if (bclass->unlock_stop)
2968 bclass->unlock_stop (basesrc);
2970 /* step 2, unblock clock sync (if any) or any other blocking thing */
2971 if (basesrc->clock_id)
2972 gst_clock_id_unschedule (basesrc->clock_id);
2974 /* signal the live source that it can start playing */
2975 basesrc->live_running = live_play;
2977 gst_base_src_activate_pool (basesrc, TRUE);
2979 /* When unlocking drop all delayed events */
2981 GST_OBJECT_LOCK (basesrc);
2982 if (basesrc->priv->pending_events) {
2983 g_list_foreach (basesrc->priv->pending_events, (GFunc) gst_event_unref,
2985 g_list_free (basesrc->priv->pending_events);
2986 basesrc->priv->pending_events = NULL;
2987 g_atomic_int_set (&basesrc->priv->have_events, FALSE);
2989 GST_OBJECT_UNLOCK (basesrc);
2992 GST_LIVE_SIGNAL (basesrc);
2993 GST_LIVE_UNLOCK (basesrc);
2998 /* the purpose of this function is to make sure that a live source blocks in the
2999 * LIVE lock or leaves the LIVE lock and continues playing. */
3001 gst_base_src_set_playing (GstBaseSrc * basesrc, gboolean live_play)
3003 GstBaseSrcClass *bclass;
3005 bclass = GST_BASE_SRC_GET_CLASS (basesrc);
3007 /* unlock subclasses locked in ::create, we only do this when we stop playing. */
3009 GST_DEBUG_OBJECT (basesrc, "unlock");
3011 bclass->unlock (basesrc);
3014 /* we are now able to grab the LIVE lock, when we get it, we can be
3015 * waiting for PLAYING while blocked in the LIVE cond or we can be waiting
3017 GST_LIVE_LOCK (basesrc);
3018 GST_DEBUG_OBJECT (basesrc, "unschedule clock");
3020 /* unblock clock sync (if any) */
3021 if (basesrc->clock_id)
3022 gst_clock_id_unschedule (basesrc->clock_id);
3024 /* configure what to do when we get to the LIVE lock. */
3025 GST_DEBUG_OBJECT (basesrc, "live running %d", live_play);
3026 basesrc->live_running = live_play;
3031 /* clear our unlock request when going to PLAYING */
3032 GST_DEBUG_OBJECT (basesrc, "unlock stop");
3033 if (bclass->unlock_stop)
3034 bclass->unlock_stop (basesrc);
3036 /* for live sources we restart the timestamp correction */
3037 basesrc->priv->latency = -1;
3038 /* have to restart the task in case it stopped because of the unlock when
3039 * we went to PAUSED. Only do this if we operating in push mode. */
3040 GST_OBJECT_LOCK (basesrc->srcpad);
3041 start = (GST_PAD_MODE (basesrc->srcpad) == GST_PAD_MODE_PUSH);
3042 GST_OBJECT_UNLOCK (basesrc->srcpad);
3044 gst_pad_start_task (basesrc->srcpad, (GstTaskFunction) gst_base_src_loop,
3046 GST_DEBUG_OBJECT (basesrc, "signal");
3047 GST_LIVE_SIGNAL (basesrc);
3049 GST_LIVE_UNLOCK (basesrc);
3055 gst_base_src_activate_push (GstPad * pad, GstObject * parent, gboolean active)
3057 GstBaseSrc *basesrc;
3060 basesrc = GST_BASE_SRC (parent);
3062 /* prepare subclass first */
3064 GST_DEBUG_OBJECT (basesrc, "Activating in push mode");
3066 if (G_UNLIKELY (!basesrc->can_activate_push))
3067 goto no_push_activation;
3069 if (G_UNLIKELY (!gst_base_src_start (basesrc)))
3072 basesrc->priv->discont = TRUE;
3073 gst_base_src_set_flushing (basesrc, FALSE, FALSE, FALSE, NULL);
3075 /* do initial seek, which will start the task */
3076 GST_OBJECT_LOCK (basesrc);
3077 event = basesrc->pending_seek;
3078 basesrc->pending_seek = NULL;
3079 GST_OBJECT_UNLOCK (basesrc);
3081 /* no need to unlock anything, the task is certainly
3082 * not running here. The perform seek code will start the task when
3084 if (G_UNLIKELY (!gst_base_src_perform_seek (basesrc, event, FALSE)))
3088 gst_event_unref (event);
3090 GST_DEBUG_OBJECT (basesrc, "Deactivating in push mode");
3092 gst_base_src_set_flushing (basesrc, TRUE, FALSE, TRUE, NULL);
3094 gst_pad_stop_task (pad);
3095 /* now we can stop the source */
3096 if (G_UNLIKELY (!gst_base_src_stop (basesrc)))
3104 GST_WARNING_OBJECT (basesrc, "Subclass disabled push-mode activation");
3109 GST_WARNING_OBJECT (basesrc, "Failed to start in push mode");
3114 GST_ERROR_OBJECT (basesrc, "Failed to perform initial seek");
3116 gst_base_src_set_flushing (basesrc, TRUE, FALSE, TRUE, NULL);
3118 gst_pad_stop_task (pad);
3119 /* Stop the basesrc */
3120 gst_base_src_stop (basesrc);
3122 gst_event_unref (event);
3127 GST_DEBUG_OBJECT (basesrc, "Failed to stop in push mode");
3133 gst_base_src_activate_pull (GstPad * pad, GstObject * parent, gboolean active)
3135 GstBaseSrc *basesrc;
3137 basesrc = GST_BASE_SRC (parent);
3139 /* prepare subclass first */
3141 GST_DEBUG_OBJECT (basesrc, "Activating in pull mode");
3142 if (G_UNLIKELY (!gst_base_src_start (basesrc)))
3145 /* if not random_access, we cannot operate in pull mode for now */
3146 if (G_UNLIKELY (!gst_base_src_is_random_access (basesrc)))
3149 /* stop flushing now but for live sources, still block in the LIVE lock when
3150 * we are not yet PLAYING */
3151 gst_base_src_set_flushing (basesrc, FALSE, FALSE, FALSE, NULL);
3153 GST_DEBUG_OBJECT (basesrc, "Deactivating in pull mode");
3154 /* flush all, there is no task to stop */
3155 gst_base_src_set_flushing (basesrc, TRUE, FALSE, TRUE, NULL);
3157 if (G_UNLIKELY (!gst_base_src_stop (basesrc)))
3165 GST_ERROR_OBJECT (basesrc, "Failed to start in pull mode");
3170 GST_ERROR_OBJECT (basesrc, "Cannot operate in pull mode, stopping");
3171 gst_base_src_stop (basesrc);
3176 GST_ERROR_OBJECT (basesrc, "Failed to stop in pull mode");
3182 gst_base_src_activate_mode (GstPad * pad, GstObject * parent,
3183 GstPadMode mode, gboolean active)
3188 case GST_PAD_MODE_PULL:
3189 res = gst_base_src_activate_pull (pad, parent, active);
3191 case GST_PAD_MODE_PUSH:
3192 res = gst_base_src_activate_push (pad, parent, active);
3195 GST_LOG_OBJECT (pad, "unknown activation mode %d", mode);
3203 static GstStateChangeReturn
3204 gst_base_src_change_state (GstElement * element, GstStateChange transition)
3206 GstBaseSrc *basesrc;
3207 GstStateChangeReturn result;
3208 gboolean no_preroll = FALSE;
3210 basesrc = GST_BASE_SRC (element);
3212 switch (transition) {
3213 case GST_STATE_CHANGE_NULL_TO_READY:
3215 case GST_STATE_CHANGE_READY_TO_PAUSED:
3216 no_preroll = gst_base_src_is_live (basesrc);
3218 case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
3219 GST_DEBUG_OBJECT (basesrc, "PAUSED->PLAYING");
3220 if (gst_base_src_is_live (basesrc)) {
3221 /* now we can start playback */
3222 gst_base_src_set_playing (basesrc, TRUE);
3230 GST_ELEMENT_CLASS (parent_class)->change_state (element,
3231 transition)) == GST_STATE_CHANGE_FAILURE)
3234 switch (transition) {
3235 case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
3236 GST_DEBUG_OBJECT (basesrc, "PLAYING->PAUSED");
3237 if (gst_base_src_is_live (basesrc)) {
3238 /* make sure we block in the live lock in PAUSED */
3239 gst_base_src_set_playing (basesrc, FALSE);
3243 case GST_STATE_CHANGE_PAUSED_TO_READY:
3247 /* we don't need to unblock anything here, the pad deactivation code
3248 * already did this */
3249 g_atomic_int_set (&basesrc->priv->pending_eos, FALSE);
3250 event_p = &basesrc->pending_seek;
3251 gst_event_replace (event_p, NULL);
3254 case GST_STATE_CHANGE_READY_TO_NULL:
3260 if (no_preroll && result == GST_STATE_CHANGE_SUCCESS)
3261 result = GST_STATE_CHANGE_NO_PREROLL;
3268 GST_DEBUG_OBJECT (basesrc, "parent failed state change");