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>
163 #include <gst/glib-compat-private.h>
165 #include "gstbasesrc.h"
166 #include "gsttypefindhelper.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_WAIT_UNTIL(elem, end_time) g_cond_timed_wait (GST_LIVE_GET_COND (elem), GST_LIVE_GET_LOCK (elem), end_time)
179 #define GST_LIVE_SIGNAL(elem) g_cond_signal (GST_LIVE_GET_COND (elem));
180 #define GST_LIVE_BROADCAST(elem) g_cond_broadcast (GST_LIVE_GET_COND (elem));
182 /* BaseSrc signals and args */
189 #define DEFAULT_BLOCKSIZE 4096
190 #define DEFAULT_NUM_BUFFERS -1
191 #define DEFAULT_TYPEFIND FALSE
192 #define DEFAULT_DO_TIMESTAMP FALSE
203 #define GST_BASE_SRC_GET_PRIVATE(obj) \
204 (G_TYPE_INSTANCE_GET_PRIVATE ((obj), GST_TYPE_BASE_SRC, GstBaseSrcPrivate))
206 struct _GstBaseSrcPrivate
211 GstFlowReturn start_result;
214 /* if a stream-start event should be sent */
215 gboolean stream_start_pending;
217 /* if segment should be sent */
218 gboolean segment_pending;
220 /* if EOS is pending (atomic) */
223 /* startup latency is the time it takes between going to PLAYING and producing
224 * the first BUFFER with running_time 0. This value is included in the latency
226 GstClockTime latency;
227 /* timestamp offset, this is the offset add to the values of gst_times for
228 * pseudo live sources */
229 GstClockTimeDiff ts_offset;
231 gboolean do_timestamp;
232 volatile gint dynamic_size;
234 /* stream sequence number */
237 /* pending events (TAG, CUSTOM_BOTH, CUSTOM_DOWNSTREAM) to be
238 * pushed in the data stream */
239 GList *pending_events;
240 volatile gint have_events;
242 /* QoS *//* with LOCK */
243 gboolean qos_enabled;
245 GstClockTime earliest_time;
248 GstAllocator *allocator;
249 GstAllocationParams params;
252 static GstElementClass *parent_class = NULL;
254 static void gst_base_src_class_init (GstBaseSrcClass * klass);
255 static void gst_base_src_init (GstBaseSrc * src, gpointer g_class);
256 static void gst_base_src_finalize (GObject * object);
260 gst_base_src_get_type (void)
262 static volatile gsize base_src_type = 0;
264 if (g_once_init_enter (&base_src_type)) {
266 static const GTypeInfo base_src_info = {
267 sizeof (GstBaseSrcClass),
270 (GClassInitFunc) gst_base_src_class_init,
275 (GInstanceInitFunc) gst_base_src_init,
278 _type = g_type_register_static (GST_TYPE_ELEMENT,
279 "GstBaseSrc", &base_src_info, G_TYPE_FLAG_ABSTRACT);
280 g_once_init_leave (&base_src_type, _type);
282 return base_src_type;
285 static GstCaps *gst_base_src_default_get_caps (GstBaseSrc * bsrc,
287 static GstCaps *gst_base_src_default_fixate (GstBaseSrc * src, GstCaps * caps);
288 static GstCaps *gst_base_src_fixate (GstBaseSrc * src, GstCaps * caps);
290 static gboolean gst_base_src_is_random_access (GstBaseSrc * src);
291 static gboolean gst_base_src_activate_mode (GstPad * pad, GstObject * parent,
292 GstPadMode mode, gboolean active);
293 static void gst_base_src_set_property (GObject * object, guint prop_id,
294 const GValue * value, GParamSpec * pspec);
295 static void gst_base_src_get_property (GObject * object, guint prop_id,
296 GValue * value, GParamSpec * pspec);
297 static gboolean gst_base_src_event (GstPad * pad, GstObject * parent,
299 static gboolean gst_base_src_send_event (GstElement * elem, GstEvent * event);
300 static gboolean gst_base_src_default_event (GstBaseSrc * src, GstEvent * event);
302 static gboolean gst_base_src_query (GstPad * pad, GstObject * parent,
305 static gboolean gst_base_src_activate_pool (GstBaseSrc * basesrc,
307 static gboolean gst_base_src_default_negotiate (GstBaseSrc * basesrc);
308 static gboolean gst_base_src_default_do_seek (GstBaseSrc * src,
309 GstSegment * segment);
310 static gboolean gst_base_src_default_query (GstBaseSrc * src, GstQuery * query);
311 static gboolean gst_base_src_default_prepare_seek_segment (GstBaseSrc * src,
312 GstEvent * event, GstSegment * segment);
313 static GstFlowReturn gst_base_src_default_create (GstBaseSrc * basesrc,
314 guint64 offset, guint size, GstBuffer ** buf);
315 static GstFlowReturn gst_base_src_default_alloc (GstBaseSrc * basesrc,
316 guint64 offset, guint size, GstBuffer ** buf);
317 static gboolean gst_base_src_decide_allocation_default (GstBaseSrc * basesrc,
320 static gboolean gst_base_src_set_flushing (GstBaseSrc * basesrc,
321 gboolean flushing, gboolean live_play, gboolean * playing);
323 static gboolean gst_base_src_start (GstBaseSrc * basesrc);
324 static gboolean gst_base_src_stop (GstBaseSrc * basesrc);
326 static GstStateChangeReturn gst_base_src_change_state (GstElement * element,
327 GstStateChange transition);
329 static void gst_base_src_loop (GstPad * pad);
330 static GstFlowReturn gst_base_src_getrange (GstPad * pad, GstObject * parent,
331 guint64 offset, guint length, GstBuffer ** buf);
332 static GstFlowReturn gst_base_src_get_range (GstBaseSrc * src, guint64 offset,
333 guint length, GstBuffer ** buf);
334 static gboolean gst_base_src_seekable (GstBaseSrc * src);
335 static gboolean gst_base_src_negotiate (GstBaseSrc * basesrc);
336 static gboolean gst_base_src_update_length (GstBaseSrc * src, guint64 offset,
340 gst_base_src_class_init (GstBaseSrcClass * klass)
342 GObjectClass *gobject_class;
343 GstElementClass *gstelement_class;
345 gobject_class = G_OBJECT_CLASS (klass);
346 gstelement_class = GST_ELEMENT_CLASS (klass);
348 GST_DEBUG_CATEGORY_INIT (gst_base_src_debug, "basesrc", 0, "basesrc element");
350 g_type_class_add_private (klass, sizeof (GstBaseSrcPrivate));
352 parent_class = g_type_class_peek_parent (klass);
354 gobject_class->finalize = gst_base_src_finalize;
355 gobject_class->set_property = gst_base_src_set_property;
356 gobject_class->get_property = gst_base_src_get_property;
358 g_object_class_install_property (gobject_class, PROP_BLOCKSIZE,
359 g_param_spec_uint ("blocksize", "Block size",
360 "Size in bytes to read per buffer (-1 = default)", 0, G_MAXUINT,
361 DEFAULT_BLOCKSIZE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
362 g_object_class_install_property (gobject_class, PROP_NUM_BUFFERS,
363 g_param_spec_int ("num-buffers", "num-buffers",
364 "Number of buffers to output before sending EOS (-1 = unlimited)",
365 -1, G_MAXINT, DEFAULT_NUM_BUFFERS, G_PARAM_READWRITE |
366 G_PARAM_STATIC_STRINGS));
367 g_object_class_install_property (gobject_class, PROP_TYPEFIND,
368 g_param_spec_boolean ("typefind", "Typefind",
369 "Run typefind before negotiating", DEFAULT_TYPEFIND,
370 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
371 g_object_class_install_property (gobject_class, PROP_DO_TIMESTAMP,
372 g_param_spec_boolean ("do-timestamp", "Do timestamp",
373 "Apply current stream time to buffers", DEFAULT_DO_TIMESTAMP,
374 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
376 gstelement_class->change_state =
377 GST_DEBUG_FUNCPTR (gst_base_src_change_state);
378 gstelement_class->send_event = GST_DEBUG_FUNCPTR (gst_base_src_send_event);
380 klass->get_caps = GST_DEBUG_FUNCPTR (gst_base_src_default_get_caps);
381 klass->negotiate = GST_DEBUG_FUNCPTR (gst_base_src_default_negotiate);
382 klass->fixate = GST_DEBUG_FUNCPTR (gst_base_src_default_fixate);
383 klass->prepare_seek_segment =
384 GST_DEBUG_FUNCPTR (gst_base_src_default_prepare_seek_segment);
385 klass->do_seek = GST_DEBUG_FUNCPTR (gst_base_src_default_do_seek);
386 klass->query = GST_DEBUG_FUNCPTR (gst_base_src_default_query);
387 klass->event = GST_DEBUG_FUNCPTR (gst_base_src_default_event);
388 klass->create = GST_DEBUG_FUNCPTR (gst_base_src_default_create);
389 klass->alloc = GST_DEBUG_FUNCPTR (gst_base_src_default_alloc);
390 klass->decide_allocation =
391 GST_DEBUG_FUNCPTR (gst_base_src_decide_allocation_default);
393 /* Registering debug symbols for function pointers */
394 GST_DEBUG_REGISTER_FUNCPTR (gst_base_src_activate_mode);
395 GST_DEBUG_REGISTER_FUNCPTR (gst_base_src_event);
396 GST_DEBUG_REGISTER_FUNCPTR (gst_base_src_query);
397 GST_DEBUG_REGISTER_FUNCPTR (gst_base_src_getrange);
398 GST_DEBUG_REGISTER_FUNCPTR (gst_base_src_fixate);
402 gst_base_src_init (GstBaseSrc * basesrc, gpointer g_class)
405 GstPadTemplate *pad_template;
407 basesrc->priv = GST_BASE_SRC_GET_PRIVATE (basesrc);
409 basesrc->is_live = FALSE;
410 g_mutex_init (&basesrc->live_lock);
411 g_cond_init (&basesrc->live_cond);
412 basesrc->num_buffers = DEFAULT_NUM_BUFFERS;
413 basesrc->num_buffers_left = -1;
415 basesrc->can_activate_push = TRUE;
418 gst_element_class_get_pad_template (GST_ELEMENT_CLASS (g_class), "src");
419 g_return_if_fail (pad_template != NULL);
421 GST_DEBUG_OBJECT (basesrc, "creating src pad");
422 pad = gst_pad_new_from_template (pad_template, "src");
424 GST_DEBUG_OBJECT (basesrc, "setting functions on src pad");
425 gst_pad_set_activatemode_function (pad, gst_base_src_activate_mode);
426 gst_pad_set_event_function (pad, gst_base_src_event);
427 gst_pad_set_query_function (pad, gst_base_src_query);
428 gst_pad_set_getrange_function (pad, gst_base_src_getrange);
430 /* hold pointer to pad */
431 basesrc->srcpad = pad;
432 GST_DEBUG_OBJECT (basesrc, "adding src pad");
433 gst_element_add_pad (GST_ELEMENT (basesrc), pad);
435 basesrc->blocksize = DEFAULT_BLOCKSIZE;
436 basesrc->clock_id = NULL;
437 /* we operate in BYTES by default */
438 gst_base_src_set_format (basesrc, GST_FORMAT_BYTES);
439 basesrc->typefind = DEFAULT_TYPEFIND;
440 basesrc->priv->do_timestamp = DEFAULT_DO_TIMESTAMP;
441 g_atomic_int_set (&basesrc->priv->have_events, FALSE);
443 basesrc->priv->start_result = GST_FLOW_FLUSHING;
444 GST_OBJECT_FLAG_UNSET (basesrc, GST_BASE_SRC_FLAG_STARTED);
445 GST_OBJECT_FLAG_UNSET (basesrc, GST_BASE_SRC_FLAG_STARTING);
446 GST_OBJECT_FLAG_SET (basesrc, GST_ELEMENT_FLAG_SOURCE);
448 GST_DEBUG_OBJECT (basesrc, "init done");
452 gst_base_src_finalize (GObject * object)
457 basesrc = GST_BASE_SRC (object);
459 g_mutex_clear (&basesrc->live_lock);
460 g_cond_clear (&basesrc->live_cond);
462 event_p = &basesrc->pending_seek;
463 gst_event_replace (event_p, NULL);
465 if (basesrc->priv->pending_events) {
466 g_list_foreach (basesrc->priv->pending_events, (GFunc) gst_event_unref,
468 g_list_free (basesrc->priv->pending_events);
471 G_OBJECT_CLASS (parent_class)->finalize (object);
475 * gst_base_src_wait_playing:
478 * If the #GstBaseSrcClass.create() method performs its own synchronisation
479 * against the clock it must unblock when going from PLAYING to the PAUSED state
480 * and call this method before continuing to produce the remaining data.
482 * This function will block until a state change to PLAYING happens (in which
483 * case this function returns #GST_FLOW_OK) or the processing must be stopped due
484 * to a state change to READY or a FLUSH event (in which case this function
485 * returns #GST_FLOW_FLUSHING).
489 * Returns: #GST_FLOW_OK if @src is PLAYING and processing can
490 * continue. Any other return value should be returned from the create vmethod.
493 gst_base_src_wait_playing (GstBaseSrc * src)
495 g_return_val_if_fail (GST_IS_BASE_SRC (src), GST_FLOW_ERROR);
498 /* block until the state changes, or we get a flush, or something */
499 GST_DEBUG_OBJECT (src, "live source waiting for running state");
501 GST_DEBUG_OBJECT (src, "live source unlocked");
502 if (src->priv->flushing)
504 } while (G_UNLIKELY (!src->live_running));
511 GST_DEBUG_OBJECT (src, "we are flushing");
512 return GST_FLOW_FLUSHING;
517 * gst_base_src_set_live:
518 * @src: base source instance
519 * @live: new live-mode
521 * If the element listens to a live source, @live should
524 * A live source will not produce data in the PAUSED state and
525 * will therefore not be able to participate in the PREROLL phase
526 * of a pipeline. To signal this fact to the application and the
527 * pipeline, the state change return value of the live source will
528 * be GST_STATE_CHANGE_NO_PREROLL.
531 gst_base_src_set_live (GstBaseSrc * src, gboolean live)
533 g_return_if_fail (GST_IS_BASE_SRC (src));
535 GST_OBJECT_LOCK (src);
537 GST_OBJECT_UNLOCK (src);
541 * gst_base_src_is_live:
542 * @src: base source instance
544 * Check if an element is in live mode.
546 * Returns: %TRUE if element is in live mode.
549 gst_base_src_is_live (GstBaseSrc * src)
553 g_return_val_if_fail (GST_IS_BASE_SRC (src), FALSE);
555 GST_OBJECT_LOCK (src);
556 result = src->is_live;
557 GST_OBJECT_UNLOCK (src);
563 * gst_base_src_set_format:
564 * @src: base source instance
565 * @format: the format to use
567 * Sets the default format of the source. This will be the format used
568 * for sending NEW_SEGMENT events and for performing seeks.
570 * If a format of GST_FORMAT_BYTES is set, the element will be able to
571 * operate in pull mode if the #GstBaseSrcClass.is_seekable() returns TRUE.
573 * This function must only be called in states < %GST_STATE_PAUSED.
578 gst_base_src_set_format (GstBaseSrc * src, GstFormat format)
580 g_return_if_fail (GST_IS_BASE_SRC (src));
581 g_return_if_fail (GST_STATE (src) <= GST_STATE_READY);
583 GST_OBJECT_LOCK (src);
584 gst_segment_init (&src->segment, format);
585 GST_OBJECT_UNLOCK (src);
589 * gst_base_src_set_dynamic_size:
590 * @src: base source instance
591 * @dynamic: new dynamic size mode
593 * If not @dynamic, size is only updated when needed, such as when trying to
594 * read past current tracked size. Otherwise, size is checked for upon each
600 gst_base_src_set_dynamic_size (GstBaseSrc * src, gboolean dynamic)
602 g_return_if_fail (GST_IS_BASE_SRC (src));
604 g_atomic_int_set (&src->priv->dynamic_size, dynamic);
608 * gst_base_src_set_async:
609 * @src: base source instance
610 * @async: new async mode
612 * Configure async behaviour in @src, no state change will block. The open,
613 * close, start, stop, play and pause virtual methods will be executed in a
614 * different thread and are thus allowed to perform blocking operations. Any
615 * blocking operation should be unblocked with the unlock vmethod.
618 gst_base_src_set_async (GstBaseSrc * src, gboolean async)
620 g_return_if_fail (GST_IS_BASE_SRC (src));
622 GST_OBJECT_LOCK (src);
623 src->priv->async = async;
624 GST_OBJECT_UNLOCK (src);
628 * gst_base_src_is_async:
629 * @src: base source instance
631 * Get the current async behaviour of @src. See also gst_base_src_set_async().
633 * Returns: %TRUE if @src is operating in async mode.
636 gst_base_src_is_async (GstBaseSrc * src)
640 g_return_val_if_fail (GST_IS_BASE_SRC (src), FALSE);
642 GST_OBJECT_LOCK (src);
643 res = src->priv->async;
644 GST_OBJECT_UNLOCK (src);
651 * gst_base_src_query_latency:
653 * @live: (out) (allow-none): if the source is live
654 * @min_latency: (out) (allow-none): the min latency of the source
655 * @max_latency: (out) (allow-none): the max latency of the source
657 * Query the source for the latency parameters. @live will be TRUE when @src is
658 * configured as a live source. @min_latency will be set to the difference
659 * between the running time and the timestamp of the first buffer.
660 * @max_latency is always the undefined value of -1.
662 * This function is mostly used by subclasses.
664 * Returns: TRUE if the query succeeded.
669 gst_base_src_query_latency (GstBaseSrc * src, gboolean * live,
670 GstClockTime * min_latency, GstClockTime * max_latency)
674 g_return_val_if_fail (GST_IS_BASE_SRC (src), FALSE);
676 GST_OBJECT_LOCK (src);
678 *live = src->is_live;
680 /* if we have a startup latency, report this one, else report 0. Subclasses
681 * are supposed to override the query function if they want something
683 if (src->priv->latency != -1)
684 min = src->priv->latency;
693 GST_LOG_OBJECT (src, "latency: live %d, min %" GST_TIME_FORMAT
694 ", max %" GST_TIME_FORMAT, src->is_live, GST_TIME_ARGS (min),
696 GST_OBJECT_UNLOCK (src);
702 * gst_base_src_set_blocksize:
704 * @blocksize: the new blocksize in bytes
706 * Set the number of bytes that @src will push out with each buffer. When
707 * @blocksize is set to -1, a default length will be used.
712 gst_base_src_set_blocksize (GstBaseSrc * src, guint blocksize)
714 g_return_if_fail (GST_IS_BASE_SRC (src));
716 GST_OBJECT_LOCK (src);
717 src->blocksize = blocksize;
718 GST_OBJECT_UNLOCK (src);
722 * gst_base_src_get_blocksize:
725 * Get the number of bytes that @src will push out with each buffer.
727 * Returns: the number of bytes pushed with each buffer.
732 gst_base_src_get_blocksize (GstBaseSrc * src)
736 g_return_val_if_fail (GST_IS_BASE_SRC (src), 0);
738 GST_OBJECT_LOCK (src);
739 res = src->blocksize;
740 GST_OBJECT_UNLOCK (src);
747 * gst_base_src_set_do_timestamp:
749 * @timestamp: enable or disable timestamping
751 * Configure @src to automatically timestamp outgoing buffers based on the
752 * current running_time of the pipeline. This property is mostly useful for live
758 gst_base_src_set_do_timestamp (GstBaseSrc * src, gboolean timestamp)
760 g_return_if_fail (GST_IS_BASE_SRC (src));
762 GST_OBJECT_LOCK (src);
763 src->priv->do_timestamp = timestamp;
764 GST_OBJECT_UNLOCK (src);
768 * gst_base_src_get_do_timestamp:
771 * Query if @src timestamps outgoing buffers based on the current running_time.
773 * Returns: %TRUE if the base class will automatically timestamp outgoing buffers.
778 gst_base_src_get_do_timestamp (GstBaseSrc * src)
782 g_return_val_if_fail (GST_IS_BASE_SRC (src), FALSE);
784 GST_OBJECT_LOCK (src);
785 res = src->priv->do_timestamp;
786 GST_OBJECT_UNLOCK (src);
792 * gst_base_src_new_seamless_segment:
794 * @start: The new start value for the segment
795 * @stop: Stop value for the new segment
796 * @position: The position value for the new segent
798 * Prepare a new seamless segment for emission downstream. This function must
799 * only be called by derived sub-classes, and only from the create() function,
800 * as the stream-lock needs to be held.
802 * The format for the new segment will be the current format of the source, as
803 * configured with gst_base_src_set_format()
805 * Returns: %TRUE if preparation of the seamless segment succeeded.
810 gst_base_src_new_seamless_segment (GstBaseSrc * src, gint64 start, gint64 stop,
815 GST_DEBUG_OBJECT (src,
816 "Starting new seamless segment. Start %" GST_TIME_FORMAT " stop %"
817 GST_TIME_FORMAT " position %" GST_TIME_FORMAT, GST_TIME_ARGS (start),
818 GST_TIME_ARGS (stop), GST_TIME_ARGS (position));
820 GST_OBJECT_LOCK (src);
822 src->segment.base = gst_segment_to_running_time (&src->segment,
823 src->segment.format, src->segment.position);
824 src->segment.start = start;
825 src->segment.stop = stop;
826 src->segment.position = position;
828 /* forward, we send data from position to stop */
829 src->priv->segment_pending = TRUE;
830 GST_OBJECT_UNLOCK (src);
832 src->priv->discont = TRUE;
839 gst_base_src_send_stream_start (GstBaseSrc * src)
843 if (src->priv->stream_start_pending) {
844 ret = gst_pad_push_event (src->srcpad, gst_event_new_stream_start ());
845 src->priv->stream_start_pending = FALSE;
852 * gst_base_src_set_caps:
853 * @src: a #GstBaseSrc
856 * Set new caps on the basesrc source pad.
858 * Returns: %TRUE if the caps could be set
861 gst_base_src_set_caps (GstBaseSrc * src, GstCaps * caps)
863 GstBaseSrcClass *bclass;
866 bclass = GST_BASE_SRC_GET_CLASS (src);
868 gst_base_src_send_stream_start (src);
870 if (bclass->set_caps)
871 res = bclass->set_caps (src, caps);
873 res = gst_pad_set_caps (src->srcpad, caps);
879 gst_base_src_default_get_caps (GstBaseSrc * bsrc, GstCaps * filter)
881 GstCaps *caps = NULL;
882 GstPadTemplate *pad_template;
883 GstBaseSrcClass *bclass;
885 bclass = GST_BASE_SRC_GET_CLASS (bsrc);
888 gst_element_class_get_pad_template (GST_ELEMENT_CLASS (bclass), "src");
890 if (pad_template != NULL) {
891 caps = gst_pad_template_get_caps (pad_template);
894 GstCaps *intersection;
897 gst_caps_intersect_full (filter, caps, GST_CAPS_INTERSECT_FIRST);
898 gst_caps_unref (caps);
906 gst_base_src_default_fixate (GstBaseSrc * bsrc, GstCaps * caps)
908 GST_DEBUG_OBJECT (bsrc, "using default caps fixate function");
909 return gst_caps_fixate (caps);
913 gst_base_src_fixate (GstBaseSrc * bsrc, GstCaps * caps)
915 GstBaseSrcClass *bclass;
917 bclass = GST_BASE_SRC_GET_CLASS (bsrc);
920 caps = bclass->fixate (bsrc, caps);
926 gst_base_src_default_query (GstBaseSrc * src, GstQuery * query)
930 switch (GST_QUERY_TYPE (query)) {
931 case GST_QUERY_POSITION:
935 gst_query_parse_position (query, &format, NULL);
937 GST_DEBUG_OBJECT (src, "position query in format %s",
938 gst_format_get_name (format));
941 case GST_FORMAT_PERCENT:
947 GST_OBJECT_LOCK (src);
948 position = src->segment.position;
949 duration = src->segment.duration;
950 GST_OBJECT_UNLOCK (src);
952 if (position != -1 && duration != -1) {
953 if (position < duration)
954 percent = gst_util_uint64_scale (GST_FORMAT_PERCENT_MAX, position,
957 percent = GST_FORMAT_PERCENT_MAX;
961 gst_query_set_position (query, GST_FORMAT_PERCENT, percent);
968 GstFormat seg_format;
970 GST_OBJECT_LOCK (src);
972 gst_segment_to_stream_time (&src->segment, src->segment.format,
973 src->segment.position);
974 seg_format = src->segment.format;
975 GST_OBJECT_UNLOCK (src);
977 if (position != -1) {
978 /* convert to requested format */
980 gst_pad_query_convert (src->srcpad, seg_format,
981 position, format, &position);
985 gst_query_set_position (query, format, position);
991 case GST_QUERY_DURATION:
995 gst_query_parse_duration (query, &format, NULL);
997 GST_DEBUG_OBJECT (src, "duration query in format %s",
998 gst_format_get_name (format));
1001 case GST_FORMAT_PERCENT:
1002 gst_query_set_duration (query, GST_FORMAT_PERCENT,
1003 GST_FORMAT_PERCENT_MAX);
1009 GstFormat seg_format;
1012 /* may have to refresh duration */
1013 if (g_atomic_int_get (&src->priv->dynamic_size))
1014 gst_base_src_update_length (src, 0, &length);
1016 /* this is the duration as configured by the subclass. */
1017 GST_OBJECT_LOCK (src);
1018 duration = src->segment.duration;
1019 seg_format = src->segment.format;
1020 GST_OBJECT_UNLOCK (src);
1022 GST_LOG_OBJECT (src, "duration %" G_GINT64_FORMAT ", format %s",
1023 duration, gst_format_get_name (seg_format));
1025 if (duration != -1) {
1026 /* convert to requested format, if this fails, we have a duration
1027 * but we cannot answer the query, we must return FALSE. */
1029 gst_pad_query_convert (src->srcpad, seg_format,
1030 duration, format, &duration);
1032 /* The subclass did not configure a duration, we assume that the
1033 * media has an unknown duration then and we return TRUE to report
1034 * this. Note that this is not the same as returning FALSE, which
1035 * means that we cannot report the duration at all. */
1038 gst_query_set_duration (query, format, duration);
1045 case GST_QUERY_SEEKING:
1047 GstFormat format, seg_format;
1050 GST_OBJECT_LOCK (src);
1051 duration = src->segment.duration;
1052 seg_format = src->segment.format;
1053 GST_OBJECT_UNLOCK (src);
1055 gst_query_parse_seeking (query, &format, NULL, NULL, NULL);
1056 if (format == seg_format) {
1057 gst_query_set_seeking (query, seg_format,
1058 gst_base_src_seekable (src), 0, duration);
1061 /* FIXME 0.11: return TRUE + seekable=FALSE for SEEKING query here */
1062 /* Don't reply to the query to make up for demuxers which don't
1063 * handle the SEEKING query yet. Players like Totem will fall back
1064 * to the duration when the SEEKING query isn't answered. */
1069 case GST_QUERY_SEGMENT:
1073 GST_OBJECT_LOCK (src);
1074 /* no end segment configured, current duration then */
1075 if ((stop = src->segment.stop) == -1)
1076 stop = src->segment.duration;
1077 start = src->segment.start;
1079 /* adjust to stream time */
1080 if (src->segment.time != -1) {
1081 start -= src->segment.time;
1083 stop -= src->segment.time;
1086 gst_query_set_segment (query, src->segment.rate, src->segment.format,
1088 GST_OBJECT_UNLOCK (src);
1093 case GST_QUERY_FORMATS:
1095 gst_query_set_formats (query, 3, GST_FORMAT_DEFAULT,
1096 GST_FORMAT_BYTES, GST_FORMAT_PERCENT);
1100 case GST_QUERY_CONVERT:
1102 GstFormat src_fmt, dest_fmt;
1103 gint64 src_val, dest_val;
1105 gst_query_parse_convert (query, &src_fmt, &src_val, &dest_fmt, &dest_val);
1107 /* we can only convert between equal formats... */
1108 if (src_fmt == dest_fmt) {
1114 gst_query_set_convert (query, src_fmt, src_val, dest_fmt, dest_val);
1117 case GST_QUERY_LATENCY:
1119 GstClockTime min, max;
1122 /* Subclasses should override and implement something useful */
1123 res = gst_base_src_query_latency (src, &live, &min, &max);
1125 GST_LOG_OBJECT (src, "report latency: live %d, min %" GST_TIME_FORMAT
1126 ", max %" GST_TIME_FORMAT, live, GST_TIME_ARGS (min),
1127 GST_TIME_ARGS (max));
1129 gst_query_set_latency (query, live, min, max);
1132 case GST_QUERY_JITTER:
1133 case GST_QUERY_RATE:
1136 case GST_QUERY_BUFFERING:
1138 GstFormat format, seg_format;
1139 gint64 start, stop, estimated;
1141 gst_query_parse_buffering_range (query, &format, NULL, NULL, NULL);
1143 GST_DEBUG_OBJECT (src, "buffering query in format %s",
1144 gst_format_get_name (format));
1146 GST_OBJECT_LOCK (src);
1147 if (src->random_access) {
1150 if (format == GST_FORMAT_PERCENT)
1151 stop = GST_FORMAT_PERCENT_MAX;
1153 stop = src->segment.duration;
1159 seg_format = src->segment.format;
1160 GST_OBJECT_UNLOCK (src);
1162 /* convert to required format. When the conversion fails, we can't answer
1163 * the query. When the value is unknown, we can don't perform conversion
1164 * but report TRUE. */
1165 if (format != GST_FORMAT_PERCENT && stop != -1) {
1166 res = gst_pad_query_convert (src->srcpad, seg_format,
1167 stop, format, &stop);
1171 if (res && format != GST_FORMAT_PERCENT && start != -1)
1172 res = gst_pad_query_convert (src->srcpad, seg_format,
1173 start, format, &start);
1175 gst_query_set_buffering_range (query, format, start, stop, estimated);
1178 case GST_QUERY_SCHEDULING:
1180 gboolean random_access;
1182 random_access = gst_base_src_is_random_access (src);
1184 /* we can operate in getrange mode if the native format is bytes
1185 * and we are seekable, this condition is set in the random_access
1186 * flag and is set in the _start() method. */
1187 gst_query_set_scheduling (query, GST_SCHEDULING_FLAG_SEEKABLE, 1, -1, 0);
1189 gst_query_add_scheduling_mode (query, GST_PAD_MODE_PULL);
1190 gst_query_add_scheduling_mode (query, GST_PAD_MODE_PUSH);
1195 case GST_QUERY_CAPS:
1197 GstBaseSrcClass *bclass;
1198 GstCaps *caps, *filter;
1200 bclass = GST_BASE_SRC_GET_CLASS (src);
1201 if (bclass->get_caps) {
1202 gst_query_parse_caps (query, &filter);
1203 if ((caps = bclass->get_caps (src, filter))) {
1204 gst_query_set_caps_result (query, caps);
1205 gst_caps_unref (caps);
1218 GST_DEBUG_OBJECT (src, "query %s returns %d", GST_QUERY_TYPE_NAME (query),
1225 gst_base_src_query (GstPad * pad, GstObject * parent, GstQuery * query)
1228 GstBaseSrcClass *bclass;
1229 gboolean result = FALSE;
1231 src = GST_BASE_SRC (parent);
1232 bclass = GST_BASE_SRC_GET_CLASS (src);
1235 result = bclass->query (src, query);
1241 gst_base_src_default_do_seek (GstBaseSrc * src, GstSegment * segment)
1243 gboolean res = TRUE;
1245 /* update our offset if the start/stop position was updated */
1246 if (segment->format == GST_FORMAT_BYTES) {
1247 segment->time = segment->start;
1248 } else if (segment->start == 0) {
1249 /* seek to start, we can implement a default for this. */
1253 GST_INFO_OBJECT (src, "Can't do a default seek");
1260 gst_base_src_do_seek (GstBaseSrc * src, GstSegment * segment)
1262 GstBaseSrcClass *bclass;
1263 gboolean result = FALSE;
1265 bclass = GST_BASE_SRC_GET_CLASS (src);
1267 if (bclass->do_seek)
1268 result = bclass->do_seek (src, segment);
1273 #define SEEK_TYPE_IS_RELATIVE(t) (((t) != GST_SEEK_TYPE_NONE) && ((t) != GST_SEEK_TYPE_SET))
1276 gst_base_src_default_prepare_seek_segment (GstBaseSrc * src, GstEvent * event,
1277 GstSegment * segment)
1279 /* By default, we try one of 2 things:
1280 * - For absolute seek positions, convert the requested position to our
1281 * configured processing format and place it in the output segment \
1282 * - For relative seek positions, convert our current (input) values to the
1283 * seek format, adjust by the relative seek offset and then convert back to
1284 * the processing format
1286 GstSeekType cur_type, stop_type;
1289 GstFormat seek_format, dest_format;
1292 gboolean res = TRUE;
1294 gst_event_parse_seek (event, &rate, &seek_format, &flags,
1295 &cur_type, &cur, &stop_type, &stop);
1296 dest_format = segment->format;
1298 if (seek_format == dest_format) {
1299 gst_segment_do_seek (segment, rate, seek_format, flags,
1300 cur_type, cur, stop_type, stop, &update);
1304 if (cur_type != GST_SEEK_TYPE_NONE) {
1305 /* FIXME: Handle seek_cur & seek_end by converting the input segment vals */
1307 gst_pad_query_convert (src->srcpad, seek_format, cur, dest_format,
1309 cur_type = GST_SEEK_TYPE_SET;
1312 if (res && stop_type != GST_SEEK_TYPE_NONE) {
1313 /* FIXME: Handle seek_cur & seek_end by converting the input segment vals */
1315 gst_pad_query_convert (src->srcpad, seek_format, stop, dest_format,
1317 stop_type = GST_SEEK_TYPE_SET;
1320 /* And finally, configure our output segment in the desired format */
1321 gst_segment_do_seek (segment, rate, dest_format, flags, cur_type, cur,
1322 stop_type, stop, &update);
1331 GST_DEBUG_OBJECT (src, "undefined format given, seek aborted.");
1337 gst_base_src_prepare_seek_segment (GstBaseSrc * src, GstEvent * event,
1338 GstSegment * seeksegment)
1340 GstBaseSrcClass *bclass;
1341 gboolean result = FALSE;
1343 bclass = GST_BASE_SRC_GET_CLASS (src);
1345 if (bclass->prepare_seek_segment)
1346 result = bclass->prepare_seek_segment (src, event, seeksegment);
1351 static GstFlowReturn
1352 gst_base_src_default_alloc (GstBaseSrc * src, guint64 offset,
1353 guint size, GstBuffer ** buffer)
1356 GstBaseSrcPrivate *priv = src->priv;
1359 ret = gst_buffer_pool_acquire_buffer (priv->pool, buffer, NULL);
1360 } else if (size != -1) {
1361 *buffer = gst_buffer_new_allocate (priv->allocator, size, &priv->params);
1362 if (G_UNLIKELY (*buffer == NULL))
1367 GST_WARNING_OBJECT (src, "Not trying to alloc %u bytes. Blocksize not set?",
1376 GST_ERROR_OBJECT (src, "Failed to allocate %u bytes", size);
1377 return GST_FLOW_ERROR;
1381 static GstFlowReturn
1382 gst_base_src_default_create (GstBaseSrc * src, guint64 offset,
1383 guint size, GstBuffer ** buffer)
1385 GstBaseSrcClass *bclass;
1389 bclass = GST_BASE_SRC_GET_CLASS (src);
1391 if (G_UNLIKELY (!bclass->alloc))
1393 if (G_UNLIKELY (!bclass->fill))
1396 if (*buffer == NULL) {
1397 /* downstream did not provide us with a buffer to fill, allocate one
1399 ret = bclass->alloc (src, offset, size, &res_buf);
1400 if (G_UNLIKELY (ret != GST_FLOW_OK))
1406 if (G_LIKELY (size > 0)) {
1407 /* only call fill when there is a size */
1408 ret = bclass->fill (src, offset, size, res_buf);
1409 if (G_UNLIKELY (ret != GST_FLOW_OK))
1420 GST_DEBUG_OBJECT (src, "no fill or alloc function");
1421 return GST_FLOW_NOT_SUPPORTED;
1425 GST_DEBUG_OBJECT (src, "Failed to allocate buffer of %u bytes", size);
1430 GST_DEBUG_OBJECT (src, "fill returned %d (%s)", ret,
1431 gst_flow_get_name (ret));
1432 if (*buffer == NULL)
1433 gst_buffer_unref (res_buf);
1438 /* this code implements the seeking. It is a good example
1439 * handling all cases.
1441 * A seek updates the currently configured segment.start
1442 * and segment.stop values based on the SEEK_TYPE. If the
1443 * segment.start value is updated, a seek to this new position
1444 * should be performed.
1446 * The seek can only be executed when we are not currently
1447 * streaming any data, to make sure that this is the case, we
1448 * acquire the STREAM_LOCK which is taken when we are in the
1449 * _loop() function or when a getrange() is called. Normally
1450 * we will not receive a seek if we are operating in pull mode
1451 * though. When we operate as a live source we might block on the live
1452 * cond, which does not release the STREAM_LOCK. Therefore we will try
1453 * to grab the LIVE_LOCK instead of the STREAM_LOCK to make sure it is
1454 * safe to perform the seek.
1456 * When we are in the loop() function, we might be in the middle
1457 * of pushing a buffer, which might block in a sink. To make sure
1458 * that the push gets unblocked we push out a FLUSH_START event.
1459 * Our loop function will get a FLUSHING return value from
1460 * the push and will pause, effectively releasing the STREAM_LOCK.
1462 * For a non-flushing seek, we pause the task, which might eventually
1463 * release the STREAM_LOCK. We say eventually because when the sink
1464 * blocks on the sample we might wait a very long time until the sink
1465 * unblocks the sample. In any case we acquire the STREAM_LOCK and
1466 * can continue the seek. A non-flushing seek is normally done in a
1467 * running pipeline to perform seamless playback, this means that the sink is
1468 * PLAYING and will return from its chain function.
1469 * In the case of a non-flushing seek we need to make sure that the
1470 * data we output after the seek is continuous with the previous data,
1471 * this is because a non-flushing seek does not reset the running-time
1472 * to 0. We do this by closing the currently running segment, ie. sending
1473 * a new_segment event with the stop position set to the last processed
1476 * After updating the segment.start/stop values, we prepare for
1477 * streaming again. We push out a FLUSH_STOP to make the peer pad
1478 * accept data again and we start our task again.
1480 * A segment seek posts a message on the bus saying that the playback
1481 * of the segment started. We store the segment flag internally because
1482 * when we reach the segment.stop we have to post a segment.done
1483 * instead of EOS when doing a segment seek.
1486 gst_base_src_perform_seek (GstBaseSrc * src, GstEvent * event)
1488 gboolean res = TRUE, tres;
1490 GstFormat seek_format, dest_format;
1492 GstSeekType cur_type, stop_type;
1494 gboolean flush, playing;
1496 gboolean relative_seek = FALSE;
1497 gboolean seekseg_configured = FALSE;
1498 GstSegment seeksegment;
1502 GST_DEBUG_OBJECT (src, "doing seek: %" GST_PTR_FORMAT, event);
1504 GST_OBJECT_LOCK (src);
1505 dest_format = src->segment.format;
1506 GST_OBJECT_UNLOCK (src);
1509 gst_event_parse_seek (event, &rate, &seek_format, &flags,
1510 &cur_type, &cur, &stop_type, &stop);
1512 relative_seek = SEEK_TYPE_IS_RELATIVE (cur_type) ||
1513 SEEK_TYPE_IS_RELATIVE (stop_type);
1515 if (dest_format != seek_format && !relative_seek) {
1516 /* If we have an ABSOLUTE position (SEEK_SET only), we can convert it
1517 * here before taking the stream lock, otherwise we must convert it later,
1518 * once we have the stream lock and can read the last configures segment
1519 * start and stop positions */
1520 gst_segment_init (&seeksegment, dest_format);
1522 if (!gst_base_src_prepare_seek_segment (src, event, &seeksegment))
1523 goto prepare_failed;
1525 seekseg_configured = TRUE;
1528 flush = flags & GST_SEEK_FLAG_FLUSH;
1529 seqnum = gst_event_get_seqnum (event);
1532 /* get next seqnum */
1533 seqnum = gst_util_seqnum_next ();
1536 /* send flush start */
1538 tevent = gst_event_new_flush_start ();
1539 gst_event_set_seqnum (tevent, seqnum);
1540 gst_pad_push_event (src->srcpad, tevent);
1542 gst_pad_pause_task (src->srcpad);
1544 /* unblock streaming thread. */
1545 gst_base_src_set_flushing (src, TRUE, FALSE, &playing);
1547 /* grab streaming lock, this should eventually be possible, either
1548 * because the task is paused, our streaming thread stopped
1549 * or because our peer is flushing. */
1550 GST_PAD_STREAM_LOCK (src->srcpad);
1551 if (G_UNLIKELY (src->priv->seqnum == seqnum)) {
1552 /* we have seen this event before, issue a warning for now */
1553 GST_WARNING_OBJECT (src, "duplicate event found %" G_GUINT32_FORMAT,
1556 src->priv->seqnum = seqnum;
1557 GST_DEBUG_OBJECT (src, "seek with seqnum %" G_GUINT32_FORMAT, seqnum);
1560 gst_base_src_set_flushing (src, FALSE, playing, NULL);
1562 /* If we configured the seeksegment above, don't overwrite it now. Otherwise
1563 * copy the current segment info into the temp segment that we can actually
1564 * attempt the seek with. We only update the real segment if the seek succeeds. */
1565 if (!seekseg_configured) {
1566 memcpy (&seeksegment, &src->segment, sizeof (GstSegment));
1568 /* now configure the final seek segment */
1570 if (seeksegment.format != seek_format) {
1571 /* OK, here's where we give the subclass a chance to convert the relative
1572 * seek into an absolute one in the processing format. We set up any
1573 * absolute seek above, before taking the stream lock. */
1574 if (!gst_base_src_prepare_seek_segment (src, event, &seeksegment)) {
1575 GST_DEBUG_OBJECT (src, "Preparing the seek failed after flushing. "
1580 /* The seek format matches our processing format, no need to ask the
1581 * the subclass to configure the segment. */
1582 gst_segment_do_seek (&seeksegment, rate, seek_format, flags,
1583 cur_type, cur, stop_type, stop, &update);
1586 /* Else, no seek event passed, so we're just (re)starting the
1591 GST_DEBUG_OBJECT (src, "segment configured from %" G_GINT64_FORMAT
1592 " to %" G_GINT64_FORMAT ", position %" G_GINT64_FORMAT,
1593 seeksegment.start, seeksegment.stop, seeksegment.position);
1595 /* do the seek, segment.position contains the new position. */
1596 res = gst_base_src_do_seek (src, &seeksegment);
1599 /* and prepare to continue streaming */
1601 tevent = gst_event_new_flush_stop (TRUE);
1602 gst_event_set_seqnum (tevent, seqnum);
1603 /* send flush stop, peer will accept data and events again. We
1604 * are not yet providing data as we still have the STREAM_LOCK. */
1605 gst_pad_push_event (src->srcpad, tevent);
1608 /* The subclass must have converted the segment to the processing format
1610 if (res && seeksegment.format != dest_format) {
1611 GST_DEBUG_OBJECT (src, "Subclass failed to prepare a seek segment "
1612 "in the correct format. Aborting seek.");
1616 /* if the seek was successful, we update our real segment and push
1617 * out the new segment. */
1619 GST_OBJECT_LOCK (src);
1620 memcpy (&src->segment, &seeksegment, sizeof (GstSegment));
1621 GST_OBJECT_UNLOCK (src);
1623 if (seeksegment.flags & GST_SEEK_FLAG_SEGMENT) {
1624 GstMessage *message;
1626 message = gst_message_new_segment_start (GST_OBJECT (src),
1627 seeksegment.format, seeksegment.position);
1628 gst_message_set_seqnum (message, seqnum);
1630 gst_element_post_message (GST_ELEMENT (src), message);
1633 /* for deriving a stop position for the playback segment from the seek
1634 * segment, we must take the duration when the stop is not set */
1635 if ((stop = seeksegment.stop) == -1)
1636 stop = seeksegment.duration;
1638 src->priv->segment_pending = TRUE;
1641 src->priv->discont = TRUE;
1642 src->running = TRUE;
1643 /* and restart the task in case it got paused explicitly or by
1644 * the FLUSH_START event we pushed out. */
1645 tres = gst_pad_start_task (src->srcpad, (GstTaskFunction) gst_base_src_loop,
1650 /* and release the lock again so we can continue streaming */
1651 GST_PAD_STREAM_UNLOCK (src->srcpad);
1657 GST_DEBUG_OBJECT (src, "Preparing the seek failed before flushing. "
1662 /* all events send to this element directly. This is mainly done from the
1666 gst_base_src_send_event (GstElement * element, GstEvent * event)
1669 gboolean result = FALSE;
1671 src = GST_BASE_SRC (element);
1673 GST_DEBUG_OBJECT (src, "handling event %p %" GST_PTR_FORMAT, event, event);
1675 switch (GST_EVENT_TYPE (event)) {
1676 /* bidirectional events */
1677 case GST_EVENT_FLUSH_START:
1678 GST_DEBUG_OBJECT (src, "pushing flush-start event downstream");
1679 result = gst_pad_push_event (src->srcpad, event);
1682 case GST_EVENT_FLUSH_STOP:
1683 GST_LIVE_LOCK (src->srcpad);
1684 src->priv->segment_pending = TRUE;
1685 /* sending random flushes downstream can break stuff,
1686 * especially sync since all segment info will get flushed */
1687 GST_DEBUG_OBJECT (src, "pushing flush-stop event downstream");
1688 result = gst_pad_push_event (src->srcpad, event);
1689 GST_LIVE_UNLOCK (src->srcpad);
1693 /* downstream serialized events */
1696 GstBaseSrcClass *bclass;
1698 bclass = GST_BASE_SRC_GET_CLASS (src);
1700 /* queue EOS and make sure the task or pull function performs the EOS
1703 * We have two possibilities:
1705 * - Before we are to enter the _create function, we check the pending_eos
1706 * first and do EOS instead of entering it.
1707 * - If we are in the _create function or we did not manage to set the
1708 * flag fast enough and we are about to enter the _create function,
1709 * we unlock it so that we exit with FLUSHING immediately. We then
1710 * check the EOS flag and do the EOS logic.
1712 g_atomic_int_set (&src->priv->pending_eos, TRUE);
1713 GST_DEBUG_OBJECT (src, "EOS marked, calling unlock");
1716 /* unlock the _create function so that we can check the pending_eos flag
1717 * and we can do EOS. This will eventually release the LIVE_LOCK again so
1718 * that we can grab it and stop the unlock again. We don't take the stream
1719 * lock so that this operation is guaranteed to never block. */
1720 gst_base_src_activate_pool (src, FALSE);
1722 bclass->unlock (src);
1724 GST_DEBUG_OBJECT (src, "unlock called, waiting for LIVE_LOCK");
1726 GST_LIVE_LOCK (src);
1727 GST_DEBUG_OBJECT (src, "LIVE_LOCK acquired, calling unlock_stop");
1728 /* now stop the unlock of the streaming thread again. Grabbing the live
1729 * lock is enough because that protects the create function. */
1730 if (bclass->unlock_stop)
1731 bclass->unlock_stop (src);
1732 gst_base_src_activate_pool (src, TRUE);
1733 GST_LIVE_UNLOCK (src);
1738 case GST_EVENT_SEGMENT:
1739 /* sending random SEGMENT downstream can break sync. */
1742 case GST_EVENT_CUSTOM_DOWNSTREAM:
1743 case GST_EVENT_CUSTOM_BOTH:
1744 /* Insert TAG, CUSTOM_DOWNSTREAM, CUSTOM_BOTH in the dataflow */
1745 GST_OBJECT_LOCK (src);
1746 src->priv->pending_events =
1747 g_list_append (src->priv->pending_events, event);
1748 g_atomic_int_set (&src->priv->have_events, TRUE);
1749 GST_OBJECT_UNLOCK (src);
1753 case GST_EVENT_BUFFERSIZE:
1754 /* does not seem to make much sense currently */
1757 /* upstream events */
1759 /* elements should override send_event and do something */
1761 case GST_EVENT_SEEK:
1765 GST_OBJECT_LOCK (src->srcpad);
1766 if (GST_PAD_MODE (src->srcpad) == GST_PAD_MODE_PULL)
1768 started = GST_PAD_MODE (src->srcpad) == GST_PAD_MODE_PUSH;
1769 GST_OBJECT_UNLOCK (src->srcpad);
1772 GST_DEBUG_OBJECT (src, "performing seek");
1773 /* when we are running in push mode, we can execute the
1774 * seek right now. */
1775 result = gst_base_src_perform_seek (src, event);
1779 /* else we store the event and execute the seek when we
1781 GST_OBJECT_LOCK (src);
1782 GST_DEBUG_OBJECT (src, "queueing seek");
1783 event_p = &src->pending_seek;
1784 gst_event_replace ((GstEvent **) event_p, event);
1785 GST_OBJECT_UNLOCK (src);
1786 /* assume the seek will work */
1791 case GST_EVENT_NAVIGATION:
1792 /* could make sense for elements that do something with navigation events
1793 * but then they would need to override the send_event function */
1795 case GST_EVENT_LATENCY:
1796 /* does not seem to make sense currently */
1800 case GST_EVENT_CUSTOM_UPSTREAM:
1801 /* override send_event if you want this */
1803 case GST_EVENT_CUSTOM_DOWNSTREAM_OOB:
1804 case GST_EVENT_CUSTOM_BOTH_OOB:
1805 /* insert a random custom event into the pipeline */
1806 GST_DEBUG_OBJECT (src, "pushing custom OOB event downstream");
1807 result = gst_pad_push_event (src->srcpad, event);
1808 /* we gave away the ref to the event in the push */
1815 /* if we still have a ref to the event, unref it now */
1817 gst_event_unref (event);
1824 GST_DEBUG_OBJECT (src, "cannot perform seek when operating in pull mode");
1825 GST_OBJECT_UNLOCK (src->srcpad);
1832 gst_base_src_seekable (GstBaseSrc * src)
1834 GstBaseSrcClass *bclass;
1835 bclass = GST_BASE_SRC_GET_CLASS (src);
1836 if (bclass->is_seekable)
1837 return bclass->is_seekable (src);
1843 gst_base_src_update_qos (GstBaseSrc * src,
1844 gdouble proportion, GstClockTimeDiff diff, GstClockTime timestamp)
1846 GST_CAT_DEBUG_OBJECT (GST_CAT_QOS, src,
1847 "qos: proportion: %lf, diff %" G_GINT64_FORMAT ", timestamp %"
1848 GST_TIME_FORMAT, proportion, diff, GST_TIME_ARGS (timestamp));
1850 GST_OBJECT_LOCK (src);
1851 src->priv->proportion = proportion;
1852 src->priv->earliest_time = timestamp + diff;
1853 GST_OBJECT_UNLOCK (src);
1858 gst_base_src_default_event (GstBaseSrc * src, GstEvent * event)
1862 GST_DEBUG_OBJECT (src, "handle event %" GST_PTR_FORMAT, event);
1864 switch (GST_EVENT_TYPE (event)) {
1865 case GST_EVENT_SEEK:
1866 /* is normally called when in push mode */
1867 if (!gst_base_src_seekable (src))
1870 result = gst_base_src_perform_seek (src, event);
1872 case GST_EVENT_FLUSH_START:
1873 /* cancel any blocking getrange, is normally called
1874 * when in pull mode. */
1875 result = gst_base_src_set_flushing (src, TRUE, FALSE, NULL);
1877 case GST_EVENT_FLUSH_STOP:
1878 result = gst_base_src_set_flushing (src, FALSE, TRUE, NULL);
1883 GstClockTimeDiff diff;
1884 GstClockTime timestamp;
1886 gst_event_parse_qos (event, NULL, &proportion, &diff, ×tamp);
1887 gst_base_src_update_qos (src, proportion, diff, timestamp);
1891 case GST_EVENT_RECONFIGURE:
1894 case GST_EVENT_LATENCY:
1906 GST_DEBUG_OBJECT (src, "is not seekable");
1912 gst_base_src_event (GstPad * pad, GstObject * parent, GstEvent * event)
1915 GstBaseSrcClass *bclass;
1916 gboolean result = FALSE;
1918 src = GST_BASE_SRC (parent);
1919 bclass = GST_BASE_SRC_GET_CLASS (src);
1921 if (bclass->event) {
1922 if (!(result = bclass->event (src, event)))
1923 goto subclass_failed;
1927 gst_event_unref (event);
1934 GST_DEBUG_OBJECT (src, "subclass refused event");
1940 gst_base_src_set_property (GObject * object, guint prop_id,
1941 const GValue * value, GParamSpec * pspec)
1945 src = GST_BASE_SRC (object);
1948 case PROP_BLOCKSIZE:
1949 gst_base_src_set_blocksize (src, g_value_get_uint (value));
1951 case PROP_NUM_BUFFERS:
1952 src->num_buffers = g_value_get_int (value);
1955 src->typefind = g_value_get_boolean (value);
1957 case PROP_DO_TIMESTAMP:
1958 gst_base_src_set_do_timestamp (src, g_value_get_boolean (value));
1961 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
1967 gst_base_src_get_property (GObject * object, guint prop_id, GValue * value,
1972 src = GST_BASE_SRC (object);
1975 case PROP_BLOCKSIZE:
1976 g_value_set_uint (value, gst_base_src_get_blocksize (src));
1978 case PROP_NUM_BUFFERS:
1979 g_value_set_int (value, src->num_buffers);
1982 g_value_set_boolean (value, src->typefind);
1984 case PROP_DO_TIMESTAMP:
1985 g_value_set_boolean (value, gst_base_src_get_do_timestamp (src));
1988 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
1993 /* with STREAM_LOCK and LOCK */
1994 static GstClockReturn
1995 gst_base_src_wait (GstBaseSrc * basesrc, GstClock * clock, GstClockTime time)
2000 id = gst_clock_new_single_shot_id (clock, time);
2002 basesrc->clock_id = id;
2003 /* release the live lock while waiting */
2004 GST_LIVE_UNLOCK (basesrc);
2006 ret = gst_clock_id_wait (id, NULL);
2008 GST_LIVE_LOCK (basesrc);
2009 gst_clock_id_unref (id);
2010 basesrc->clock_id = NULL;
2015 /* perform synchronisation on a buffer.
2018 static GstClockReturn
2019 gst_base_src_do_sync (GstBaseSrc * basesrc, GstBuffer * buffer)
2021 GstClockReturn result;
2022 GstClockTime start, end;
2023 GstBaseSrcClass *bclass;
2024 GstClockTime base_time;
2026 GstClockTime now = GST_CLOCK_TIME_NONE, timestamp;
2027 gboolean do_timestamp, first, pseudo_live, is_live;
2029 bclass = GST_BASE_SRC_GET_CLASS (basesrc);
2032 if (bclass->get_times)
2033 bclass->get_times (basesrc, buffer, &start, &end);
2035 /* get buffer timestamp */
2036 timestamp = GST_BUFFER_TIMESTAMP (buffer);
2038 /* grab the lock to prepare for clocking and calculate the startup
2040 GST_OBJECT_LOCK (basesrc);
2042 is_live = basesrc->is_live;
2043 /* if we are asked to sync against the clock we are a pseudo live element */
2044 pseudo_live = (start != -1 && is_live);
2045 /* check for the first buffer */
2046 first = (basesrc->priv->latency == -1);
2048 if (timestamp != -1 && pseudo_live) {
2049 GstClockTime latency;
2051 /* we have a timestamp and a sync time, latency is the diff */
2052 if (timestamp <= start)
2053 latency = start - timestamp;
2058 GST_DEBUG_OBJECT (basesrc, "pseudo_live with latency %" GST_TIME_FORMAT,
2059 GST_TIME_ARGS (latency));
2060 /* first time we calculate latency, just configure */
2061 basesrc->priv->latency = latency;
2063 if (basesrc->priv->latency != latency) {
2064 /* we have a new latency, FIXME post latency message */
2065 basesrc->priv->latency = latency;
2066 GST_DEBUG_OBJECT (basesrc, "latency changed to %" GST_TIME_FORMAT,
2067 GST_TIME_ARGS (latency));
2071 GST_DEBUG_OBJECT (basesrc, "no latency needed, live %d, sync %d",
2072 is_live, start != -1);
2073 basesrc->priv->latency = 0;
2076 /* get clock, if no clock, we can't sync or do timestamps */
2077 if ((clock = GST_ELEMENT_CLOCK (basesrc)) == NULL)
2080 gst_object_ref (clock);
2082 base_time = GST_ELEMENT_CAST (basesrc)->base_time;
2084 do_timestamp = basesrc->priv->do_timestamp;
2085 GST_OBJECT_UNLOCK (basesrc);
2087 /* first buffer, calculate the timestamp offset */
2089 GstClockTime running_time;
2091 now = gst_clock_get_time (clock);
2092 running_time = now - base_time;
2094 GST_LOG_OBJECT (basesrc,
2095 "startup timestamp: %" GST_TIME_FORMAT ", running_time %"
2096 GST_TIME_FORMAT, GST_TIME_ARGS (timestamp),
2097 GST_TIME_ARGS (running_time));
2099 if (pseudo_live && timestamp != -1) {
2100 /* live source and we need to sync, add startup latency to all timestamps
2101 * to get the real running_time. Live sources should always timestamp
2102 * according to the current running time. */
2103 basesrc->priv->ts_offset = GST_CLOCK_DIFF (timestamp, running_time);
2105 GST_LOG_OBJECT (basesrc, "live with sync, ts_offset %" GST_TIME_FORMAT,
2106 GST_TIME_ARGS (basesrc->priv->ts_offset));
2108 basesrc->priv->ts_offset = 0;
2109 GST_LOG_OBJECT (basesrc, "no timestamp offset needed");
2112 if (!GST_CLOCK_TIME_IS_VALID (timestamp)) {
2114 timestamp = running_time;
2118 GST_BUFFER_TIMESTAMP (buffer) = timestamp;
2120 GST_LOG_OBJECT (basesrc, "created timestamp: %" GST_TIME_FORMAT,
2121 GST_TIME_ARGS (timestamp));
2124 /* add the timestamp offset we need for sync */
2125 timestamp += basesrc->priv->ts_offset;
2127 /* not the first buffer, the timestamp is the diff between the clock and
2129 if (do_timestamp && !GST_CLOCK_TIME_IS_VALID (timestamp)) {
2130 now = gst_clock_get_time (clock);
2132 GST_BUFFER_TIMESTAMP (buffer) = now - base_time;
2134 GST_LOG_OBJECT (basesrc, "created timestamp: %" GST_TIME_FORMAT,
2135 GST_TIME_ARGS (now - base_time));
2139 /* if we don't have a buffer timestamp, we don't sync */
2140 if (!GST_CLOCK_TIME_IS_VALID (start))
2143 if (is_live && GST_CLOCK_TIME_IS_VALID (timestamp)) {
2144 /* for pseudo live sources, add our ts_offset to the timestamp */
2145 GST_BUFFER_TIMESTAMP (buffer) += basesrc->priv->ts_offset;
2146 start += basesrc->priv->ts_offset;
2149 GST_LOG_OBJECT (basesrc,
2150 "waiting for clock, base time %" GST_TIME_FORMAT
2151 ", stream_start %" GST_TIME_FORMAT,
2152 GST_TIME_ARGS (base_time), GST_TIME_ARGS (start));
2154 result = gst_base_src_wait (basesrc, clock, start + base_time);
2156 gst_object_unref (clock);
2158 GST_LOG_OBJECT (basesrc, "clock entry done: %d", result);
2165 GST_DEBUG_OBJECT (basesrc, "we have no clock");
2166 GST_OBJECT_UNLOCK (basesrc);
2167 return GST_CLOCK_OK;
2171 GST_DEBUG_OBJECT (basesrc, "no sync needed");
2172 gst_object_unref (clock);
2173 return GST_CLOCK_OK;
2177 /* Called with STREAM_LOCK and LIVE_LOCK */
2179 gst_base_src_update_length (GstBaseSrc * src, guint64 offset, guint * length)
2181 guint64 size, maxsize;
2182 GstBaseSrcClass *bclass;
2187 bclass = GST_BASE_SRC_GET_CLASS (src);
2189 format = src->segment.format;
2190 stop = src->segment.stop;
2191 /* get total file size */
2192 size = src->segment.duration;
2194 /* only operate if we are working with bytes */
2195 if (format != GST_FORMAT_BYTES)
2198 /* the max amount of bytes to read is the total size or
2199 * up to the segment.stop if present. */
2201 maxsize = MIN (size, stop);
2205 GST_DEBUG_OBJECT (src,
2206 "reading offset %" G_GUINT64_FORMAT ", length %u, size %" G_GINT64_FORMAT
2207 ", segment.stop %" G_GINT64_FORMAT ", maxsize %" G_GINT64_FORMAT, offset,
2208 *length, size, stop, maxsize);
2210 dynamic = g_atomic_int_get (&src->priv->dynamic_size);
2211 GST_DEBUG_OBJECT (src, "dynamic size: %d", dynamic);
2213 /* check size if we have one */
2214 if (maxsize != -1) {
2215 /* if we run past the end, check if the file became bigger and
2217 if (G_UNLIKELY (offset + *length >= maxsize || dynamic)) {
2218 /* see if length of the file changed */
2219 if (bclass->get_size)
2220 if (!bclass->get_size (src, &size))
2223 /* make sure we don't exceed the configured segment stop
2226 maxsize = MIN (size, stop);
2230 /* if we are at or past the end, EOS */
2231 if (G_UNLIKELY (offset >= maxsize))
2232 goto unexpected_length;
2234 /* else we can clip to the end */
2235 if (G_UNLIKELY (offset + *length >= maxsize))
2236 *length = maxsize - offset;
2241 /* keep track of current duration.
2242 * segment is in bytes, we checked that above. */
2243 GST_OBJECT_LOCK (src);
2244 src->segment.duration = size;
2245 GST_OBJECT_UNLOCK (src);
2256 /* must be called with LIVE_LOCK */
2257 static GstFlowReturn
2258 gst_base_src_get_range (GstBaseSrc * src, guint64 offset, guint length,
2262 GstBaseSrcClass *bclass;
2263 GstClockReturn status;
2266 bclass = GST_BASE_SRC_GET_CLASS (src);
2270 if (G_UNLIKELY (!src->live_running)) {
2271 ret = gst_base_src_wait_playing (src);
2272 if (ret != GST_FLOW_OK)
2277 if (G_UNLIKELY (!GST_BASE_SRC_IS_STARTED (src)
2278 && !GST_BASE_SRC_IS_STARTING (src)))
2281 if (G_UNLIKELY (!bclass->create))
2284 if (G_UNLIKELY (!gst_base_src_update_length (src, offset, &length)))
2285 goto unexpected_length;
2287 /* track position */
2288 GST_OBJECT_LOCK (src);
2289 if (src->segment.format == GST_FORMAT_BYTES)
2290 src->segment.position = offset;
2291 GST_OBJECT_UNLOCK (src);
2293 /* normally we don't count buffers */
2294 if (G_UNLIKELY (src->num_buffers_left >= 0)) {
2295 if (src->num_buffers_left == 0)
2296 goto reached_num_buffers;
2298 src->num_buffers_left--;
2301 /* don't enter the create function if a pending EOS event was set. For the
2302 * logic of the pending_eos, check the event function of this class. */
2303 if (G_UNLIKELY (g_atomic_int_get (&src->priv->pending_eos)))
2306 GST_DEBUG_OBJECT (src,
2307 "calling create offset %" G_GUINT64_FORMAT " length %u, time %"
2308 G_GINT64_FORMAT, offset, length, src->segment.time);
2312 ret = bclass->create (src, offset, length, &res_buf);
2314 /* The create function could be unlocked because we have a pending EOS. It's
2315 * possible that we have a valid buffer from create that we need to
2316 * discard when the create function returned _OK. */
2317 if (G_UNLIKELY (g_atomic_int_get (&src->priv->pending_eos))) {
2318 if (ret == GST_FLOW_OK) {
2320 gst_buffer_unref (res_buf);
2325 if (G_UNLIKELY (ret != GST_FLOW_OK))
2328 /* no timestamp set and we are at offset 0, we can timestamp with 0 */
2329 if (offset == 0 && src->segment.time == 0
2330 && GST_BUFFER_TIMESTAMP (res_buf) == -1 && !src->is_live) {
2331 GST_DEBUG_OBJECT (src, "setting first timestamp to 0");
2332 res_buf = gst_buffer_make_writable (res_buf);
2333 GST_BUFFER_TIMESTAMP (res_buf) = 0;
2336 /* now sync before pushing the buffer */
2337 status = gst_base_src_do_sync (src, res_buf);
2339 /* waiting for the clock could have made us flushing */
2340 if (G_UNLIKELY (src->priv->flushing))
2344 case GST_CLOCK_EARLY:
2345 /* the buffer is too late. We currently don't drop the buffer. */
2346 GST_DEBUG_OBJECT (src, "buffer too late!, returning anyway");
2349 /* buffer synchronised properly */
2350 GST_DEBUG_OBJECT (src, "buffer ok");
2352 case GST_CLOCK_UNSCHEDULED:
2353 /* this case is triggered when we were waiting for the clock and
2354 * it got unlocked because we did a state change. In any case, get rid of
2357 gst_buffer_unref (res_buf);
2359 if (!src->live_running) {
2360 /* We return FLUSHING when we are not running to stop the dataflow also
2361 * get rid of the produced buffer. */
2362 GST_DEBUG_OBJECT (src,
2363 "clock was unscheduled (%d), returning FLUSHING", status);
2364 ret = GST_FLOW_FLUSHING;
2366 /* If we are running when this happens, we quickly switched between
2367 * pause and playing. We try to produce a new buffer */
2368 GST_DEBUG_OBJECT (src,
2369 "clock was unscheduled (%d), but we are running", status);
2374 /* all other result values are unexpected and errors */
2375 GST_ELEMENT_ERROR (src, CORE, CLOCK,
2376 (_("Internal clock error.")),
2377 ("clock returned unexpected return value %d", status));
2379 gst_buffer_unref (res_buf);
2380 ret = GST_FLOW_ERROR;
2383 if (G_LIKELY (ret == GST_FLOW_OK))
2391 GST_DEBUG_OBJECT (src, "wait_playing returned %d (%s)", ret,
2392 gst_flow_get_name (ret));
2397 GST_DEBUG_OBJECT (src, "create returned %d (%s)", ret,
2398 gst_flow_get_name (ret));
2403 GST_DEBUG_OBJECT (src, "getrange but not started");
2404 return GST_FLOW_FLUSHING;
2408 GST_DEBUG_OBJECT (src, "no create function");
2409 return GST_FLOW_NOT_SUPPORTED;
2413 GST_DEBUG_OBJECT (src, "unexpected length %u (offset=%" G_GUINT64_FORMAT
2414 ", size=%" G_GINT64_FORMAT ")", length, offset, src->segment.duration);
2415 return GST_FLOW_EOS;
2417 reached_num_buffers:
2419 GST_DEBUG_OBJECT (src, "sent all buffers");
2420 return GST_FLOW_EOS;
2424 GST_DEBUG_OBJECT (src, "we are flushing");
2426 gst_buffer_unref (res_buf);
2427 return GST_FLOW_FLUSHING;
2431 GST_DEBUG_OBJECT (src, "we are EOS");
2432 return GST_FLOW_EOS;
2436 static GstFlowReturn
2437 gst_base_src_getrange (GstPad * pad, GstObject * parent, guint64 offset,
2438 guint length, GstBuffer ** buf)
2443 src = GST_BASE_SRC_CAST (parent);
2445 GST_LIVE_LOCK (src);
2446 if (G_UNLIKELY (src->priv->flushing))
2449 res = gst_base_src_get_range (src, offset, length, buf);
2452 GST_LIVE_UNLOCK (src);
2459 GST_DEBUG_OBJECT (src, "we are flushing");
2460 res = GST_FLOW_FLUSHING;
2466 gst_base_src_is_random_access (GstBaseSrc * src)
2468 /* we need to start the basesrc to check random access */
2469 if (!GST_BASE_SRC_IS_STARTED (src)) {
2470 GST_LOG_OBJECT (src, "doing start/stop to check get_range support");
2471 if (G_LIKELY (gst_base_src_start (src))) {
2472 if (gst_base_src_start_wait (src) != GST_FLOW_OK)
2474 gst_base_src_stop (src);
2478 return src->random_access;
2483 GST_DEBUG_OBJECT (src, "failed to start");
2489 gst_base_src_loop (GstPad * pad)
2492 GstBuffer *buf = NULL;
2497 GList *pending_events = NULL, *tmp;
2501 src = GST_BASE_SRC (GST_OBJECT_PARENT (pad));
2503 gst_base_src_send_stream_start (src);
2505 /* check if we need to renegotiate */
2506 if (gst_pad_check_reconfigure (pad)) {
2507 if (!gst_base_src_negotiate (src))
2508 goto not_negotiated;
2511 GST_LIVE_LOCK (src);
2513 if (G_UNLIKELY (src->priv->flushing))
2516 blocksize = src->blocksize;
2518 /* if we operate in bytes, we can calculate an offset */
2519 if (src->segment.format == GST_FORMAT_BYTES) {
2520 position = src->segment.position;
2521 /* for negative rates, start with subtracting the blocksize */
2522 if (src->segment.rate < 0.0) {
2523 /* we cannot go below segment.start */
2524 if (position > src->segment.start + blocksize)
2525 position -= blocksize;
2527 /* last block, remainder up to segment.start */
2528 blocksize = position - src->segment.start;
2529 position = src->segment.start;
2535 GST_LOG_OBJECT (src, "next_ts %" GST_TIME_FORMAT " size %u",
2536 GST_TIME_ARGS (position), blocksize);
2538 ret = gst_base_src_get_range (src, position, blocksize, &buf);
2539 if (G_UNLIKELY (ret != GST_FLOW_OK)) {
2540 GST_INFO_OBJECT (src, "pausing after gst_base_src_get_range() = %s",
2541 gst_flow_get_name (ret));
2542 GST_LIVE_UNLOCK (src);
2545 /* this should not happen */
2546 if (G_UNLIKELY (buf == NULL))
2549 /* push events to close/start our segment before we push the buffer. */
2550 if (G_UNLIKELY (src->priv->segment_pending)) {
2551 gst_pad_push_event (pad, gst_event_new_segment (&src->segment));
2552 src->priv->segment_pending = FALSE;
2555 if (g_atomic_int_get (&src->priv->have_events)) {
2556 GST_OBJECT_LOCK (src);
2557 /* take the events */
2558 pending_events = src->priv->pending_events;
2559 src->priv->pending_events = NULL;
2560 g_atomic_int_set (&src->priv->have_events, FALSE);
2561 GST_OBJECT_UNLOCK (src);
2564 /* Push out pending events if any */
2565 if (G_UNLIKELY (pending_events != NULL)) {
2566 for (tmp = pending_events; tmp; tmp = g_list_next (tmp)) {
2567 GstEvent *ev = (GstEvent *) tmp->data;
2568 gst_pad_push_event (pad, ev);
2570 g_list_free (pending_events);
2573 /* figure out the new position */
2574 switch (src->segment.format) {
2575 case GST_FORMAT_BYTES:
2577 guint bufsize = gst_buffer_get_size (buf);
2579 /* we subtracted above for negative rates */
2580 if (src->segment.rate >= 0.0)
2581 position += bufsize;
2584 case GST_FORMAT_TIME:
2586 GstClockTime start, duration;
2588 start = GST_BUFFER_TIMESTAMP (buf);
2589 duration = GST_BUFFER_DURATION (buf);
2591 if (GST_CLOCK_TIME_IS_VALID (start))
2594 position = src->segment.position;
2596 if (GST_CLOCK_TIME_IS_VALID (duration)) {
2597 if (src->segment.rate >= 0.0)
2598 position += duration;
2599 else if (position > duration)
2600 position -= duration;
2606 case GST_FORMAT_DEFAULT:
2607 if (src->segment.rate >= 0.0)
2608 position = GST_BUFFER_OFFSET_END (buf);
2610 position = GST_BUFFER_OFFSET (buf);
2616 if (position != -1) {
2617 if (src->segment.rate >= 0.0) {
2618 /* positive rate, check if we reached the stop */
2619 if (src->segment.stop != -1) {
2620 if (position >= src->segment.stop) {
2622 position = src->segment.stop;
2626 /* negative rate, check if we reached the start. start is always set to
2627 * something different from -1 */
2628 if (position <= src->segment.start) {
2630 position = src->segment.start;
2632 /* when going reverse, all buffers are DISCONT */
2633 src->priv->discont = TRUE;
2635 GST_OBJECT_LOCK (src);
2636 src->segment.position = position;
2637 GST_OBJECT_UNLOCK (src);
2640 if (G_UNLIKELY (src->priv->discont)) {
2641 GST_INFO_OBJECT (src, "marking pending DISCONT");
2642 buf = gst_buffer_make_writable (buf);
2643 GST_BUFFER_FLAG_SET (buf, GST_BUFFER_FLAG_DISCONT);
2644 src->priv->discont = FALSE;
2646 GST_LIVE_UNLOCK (src);
2648 ret = gst_pad_push (pad, buf);
2649 if (G_UNLIKELY (ret != GST_FLOW_OK)) {
2650 GST_INFO_OBJECT (src, "pausing after gst_pad_push() = %s",
2651 gst_flow_get_name (ret));
2655 if (G_UNLIKELY (eos)) {
2656 GST_INFO_OBJECT (src, "pausing after end of segment");
2667 GST_DEBUG_OBJECT (src, "Failed to renegotiate");
2668 ret = GST_FLOW_NOT_NEGOTIATED;
2673 GST_DEBUG_OBJECT (src, "we are flushing");
2674 GST_LIVE_UNLOCK (src);
2675 ret = GST_FLOW_FLUSHING;
2680 const gchar *reason = gst_flow_get_name (ret);
2683 GST_DEBUG_OBJECT (src, "pausing task, reason %s", reason);
2684 src->running = FALSE;
2685 gst_pad_pause_task (pad);
2686 if (ret == GST_FLOW_EOS) {
2687 gboolean flag_segment;
2691 /* perform EOS logic */
2692 flag_segment = (src->segment.flags & GST_SEEK_FLAG_SEGMENT) != 0;
2693 format = src->segment.format;
2694 position = src->segment.position;
2697 GstMessage *message;
2699 message = gst_message_new_segment_done (GST_OBJECT_CAST (src),
2701 gst_message_set_seqnum (message, src->priv->seqnum);
2702 gst_element_post_message (GST_ELEMENT_CAST (src), message);
2704 event = gst_event_new_eos ();
2705 gst_event_set_seqnum (event, src->priv->seqnum);
2706 gst_pad_push_event (pad, event);
2708 } else if (ret == GST_FLOW_NOT_LINKED || ret <= GST_FLOW_EOS) {
2709 event = gst_event_new_eos ();
2710 gst_event_set_seqnum (event, src->priv->seqnum);
2711 /* for fatal errors we post an error message, post the error
2712 * first so the app knows about the error first.
2713 * Also don't do this for FLUSHING because it happens
2714 * due to flushing and posting an error message because of
2715 * that is the wrong thing to do, e.g. when we're doing
2716 * a flushing seek. */
2717 GST_ELEMENT_ERROR (src, STREAM, FAILED,
2718 (_("Internal data flow error.")),
2719 ("streaming task paused, reason %s (%d)", reason, ret));
2720 gst_pad_push_event (pad, event);
2726 GST_ELEMENT_ERROR (src, STREAM, FAILED,
2727 (_("Internal data flow error.")), ("element returned NULL buffer"));
2728 GST_LIVE_UNLOCK (src);
2734 gst_base_src_set_allocation (GstBaseSrc * basesrc, GstBufferPool * pool,
2735 GstAllocator * allocator, GstAllocationParams * params)
2737 GstAllocator *oldalloc;
2738 GstBufferPool *oldpool;
2739 GstBaseSrcPrivate *priv = basesrc->priv;
2742 GST_DEBUG_OBJECT (basesrc, "activate pool");
2743 if (!gst_buffer_pool_set_active (pool, TRUE))
2744 goto activate_failed;
2747 GST_OBJECT_LOCK (basesrc);
2748 oldpool = priv->pool;
2751 oldalloc = priv->allocator;
2752 priv->allocator = allocator;
2755 priv->params = *params;
2757 gst_allocation_params_init (&priv->params);
2758 GST_OBJECT_UNLOCK (basesrc);
2761 /* only deactivate if the pool is not the one we're using */
2762 if (oldpool != pool) {
2763 GST_DEBUG_OBJECT (basesrc, "deactivate old pool");
2764 gst_buffer_pool_set_active (oldpool, FALSE);
2766 gst_object_unref (oldpool);
2769 gst_allocator_unref (oldalloc);
2776 GST_ERROR_OBJECT (basesrc, "failed to activate bufferpool.");
2782 gst_base_src_activate_pool (GstBaseSrc * basesrc, gboolean active)
2784 GstBaseSrcPrivate *priv = basesrc->priv;
2785 GstBufferPool *pool;
2786 gboolean res = TRUE;
2788 GST_OBJECT_LOCK (basesrc);
2789 if ((pool = priv->pool))
2790 pool = gst_object_ref (pool);
2791 GST_OBJECT_UNLOCK (basesrc);
2794 res = gst_buffer_pool_set_active (pool, active);
2795 gst_object_unref (pool);
2802 gst_base_src_decide_allocation_default (GstBaseSrc * basesrc, GstQuery * query)
2805 GstBufferPool *pool;
2806 guint size, min, max;
2807 GstAllocator *allocator;
2808 GstAllocationParams params;
2809 GstStructure *config;
2810 gboolean update_allocator;
2812 gst_query_parse_allocation (query, &outcaps, NULL);
2814 /* we got configuration from our peer or the decide_allocation method,
2816 if (gst_query_get_n_allocation_params (query) > 0) {
2817 /* try the allocator */
2818 gst_query_parse_nth_allocation_param (query, 0, &allocator, ¶ms);
2819 update_allocator = TRUE;
2822 gst_allocation_params_init (¶ms);
2823 update_allocator = FALSE;
2826 if (gst_query_get_n_allocation_pools (query) > 0) {
2827 gst_query_parse_nth_allocation_pool (query, 0, &pool, &size, &min, &max);
2830 /* no pool, we can make our own */
2831 GST_DEBUG_OBJECT (basesrc, "no pool, making new pool");
2832 pool = gst_buffer_pool_new ();
2836 size = min = max = 0;
2841 config = gst_buffer_pool_get_config (pool);
2842 gst_buffer_pool_config_set_params (config, outcaps, size, min, max);
2843 gst_buffer_pool_config_set_allocator (config, allocator, ¶ms);
2844 gst_buffer_pool_set_config (pool, config);
2847 if (update_allocator)
2848 gst_query_set_nth_allocation_param (query, 0, allocator, ¶ms);
2850 gst_query_add_allocation_param (query, allocator, ¶ms);
2852 gst_allocator_unref (allocator);
2855 gst_query_set_nth_allocation_pool (query, 0, pool, size, min, max);
2856 gst_object_unref (pool);
2863 gst_base_src_prepare_allocation (GstBaseSrc * basesrc, GstCaps * caps)
2865 GstBaseSrcClass *bclass;
2866 gboolean result = TRUE;
2868 GstBufferPool *pool = NULL;
2869 GstAllocator *allocator = NULL;
2870 GstAllocationParams params;
2872 bclass = GST_BASE_SRC_GET_CLASS (basesrc);
2874 /* make query and let peer pad answer, we don't really care if it worked or
2875 * not, if it failed, the allocation query would contain defaults and the
2876 * subclass would then set better values if needed */
2877 query = gst_query_new_allocation (caps, TRUE);
2878 if (!gst_pad_peer_query (basesrc->srcpad, query)) {
2879 /* not a problem, just debug a little */
2880 GST_DEBUG_OBJECT (basesrc, "peer ALLOCATION query failed");
2883 g_assert (bclass->decide_allocation != NULL);
2884 result = bclass->decide_allocation (basesrc, query);
2886 GST_DEBUG_OBJECT (basesrc, "ALLOCATION (%d) params: %" GST_PTR_FORMAT, result,
2890 goto no_decide_allocation;
2892 /* we got configuration from our peer or the decide_allocation method,
2894 if (gst_query_get_n_allocation_params (query) > 0) {
2895 gst_query_parse_nth_allocation_param (query, 0, &allocator, ¶ms);
2898 gst_allocation_params_init (¶ms);
2901 if (gst_query_get_n_allocation_pools (query) > 0)
2902 gst_query_parse_nth_allocation_pool (query, 0, &pool, NULL, NULL, NULL);
2904 result = gst_base_src_set_allocation (basesrc, pool, allocator, ¶ms);
2906 gst_query_unref (query);
2911 no_decide_allocation:
2913 GST_WARNING_OBJECT (basesrc, "Subclass failed to decide allocation");
2914 gst_query_unref (query);
2920 /* default negotiation code.
2922 * Take intersection between src and sink pads, take first
2926 gst_base_src_default_negotiate (GstBaseSrc * basesrc)
2929 GstCaps *caps = NULL;
2930 GstCaps *peercaps = NULL;
2931 gboolean result = FALSE;
2933 /* first see what is possible on our source pad */
2934 thiscaps = gst_pad_query_caps (GST_BASE_SRC_PAD (basesrc), NULL);
2935 GST_DEBUG_OBJECT (basesrc, "caps of src: %" GST_PTR_FORMAT, thiscaps);
2936 /* nothing or anything is allowed, we're done */
2937 if (thiscaps == NULL || gst_caps_is_any (thiscaps))
2938 goto no_nego_needed;
2940 if (G_UNLIKELY (gst_caps_is_empty (thiscaps)))
2943 /* get the peer caps */
2944 peercaps = gst_pad_peer_query_caps (GST_BASE_SRC_PAD (basesrc), thiscaps);
2945 GST_DEBUG_OBJECT (basesrc, "caps of peer: %" GST_PTR_FORMAT, peercaps);
2947 /* The result is already a subset of our caps */
2949 gst_caps_unref (thiscaps);
2951 /* no peer, work with our own caps then */
2954 if (caps && !gst_caps_is_empty (caps)) {
2956 GST_DEBUG_OBJECT (basesrc, "have caps: %" GST_PTR_FORMAT, caps);
2957 if (gst_caps_is_any (caps)) {
2958 GST_DEBUG_OBJECT (basesrc, "any caps, we stop");
2959 /* hmm, still anything, so element can do anything and
2960 * nego is not needed */
2963 caps = gst_base_src_fixate (basesrc, caps);
2964 GST_DEBUG_OBJECT (basesrc, "fixated to: %" GST_PTR_FORMAT, caps);
2965 if (gst_caps_is_fixed (caps)) {
2966 /* yay, fixed caps, use those then, it's possible that the subclass does
2967 * not accept this caps after all and we have to fail. */
2968 result = gst_base_src_set_caps (basesrc, caps);
2971 gst_caps_unref (caps);
2974 gst_caps_unref (caps);
2975 GST_DEBUG_OBJECT (basesrc, "no common caps");
2981 GST_DEBUG_OBJECT (basesrc, "no negotiation needed");
2983 gst_caps_unref (thiscaps);
2988 GST_ELEMENT_ERROR (basesrc, STREAM, FORMAT,
2989 ("No supported formats found"),
2990 ("This element did not produce valid caps"));
2992 gst_caps_unref (thiscaps);
2998 gst_base_src_negotiate (GstBaseSrc * basesrc)
3000 GstBaseSrcClass *bclass;
3003 bclass = GST_BASE_SRC_GET_CLASS (basesrc);
3005 GST_DEBUG_OBJECT (basesrc, "starting negotiation");
3007 if (G_LIKELY (bclass->negotiate))
3008 result = bclass->negotiate (basesrc);
3012 if (G_LIKELY (result)) {
3015 caps = gst_pad_get_current_caps (basesrc->srcpad);
3017 result = gst_base_src_prepare_allocation (basesrc, caps);
3020 gst_caps_unref (caps);
3026 gst_base_src_start (GstBaseSrc * basesrc)
3028 GstBaseSrcClass *bclass;
3031 GST_LIVE_LOCK (basesrc);
3032 if (GST_BASE_SRC_IS_STARTING (basesrc))
3034 if (GST_BASE_SRC_IS_STARTED (basesrc))
3037 basesrc->priv->start_result = GST_FLOW_FLUSHING;
3038 GST_OBJECT_FLAG_SET (basesrc, GST_BASE_SRC_FLAG_STARTING);
3039 basesrc->num_buffers_left = basesrc->num_buffers;
3040 basesrc->running = FALSE;
3041 basesrc->priv->segment_pending = FALSE;
3042 GST_OBJECT_LOCK (basesrc);
3043 gst_segment_init (&basesrc->segment, basesrc->segment.format);
3044 GST_OBJECT_UNLOCK (basesrc);
3045 GST_LIVE_UNLOCK (basesrc);
3047 bclass = GST_BASE_SRC_GET_CLASS (basesrc);
3049 result = bclass->start (basesrc);
3054 goto could_not_start;
3056 if (!gst_base_src_is_async (basesrc))
3057 gst_base_src_start_complete (basesrc, GST_FLOW_OK);
3064 GST_DEBUG_OBJECT (basesrc, "was starting");
3065 GST_LIVE_UNLOCK (basesrc);
3070 GST_DEBUG_OBJECT (basesrc, "was started");
3071 GST_LIVE_UNLOCK (basesrc);
3076 GST_DEBUG_OBJECT (basesrc, "could not start");
3077 /* subclass is supposed to post a message. We don't have to call _stop. */
3078 gst_base_src_start_complete (basesrc, GST_FLOW_ERROR);
3084 * gst_base_src_start_complete:
3085 * @src: base source instance
3086 * @ret: a #GstFlowReturn
3088 * Complete an asynchronous start operation. When the subclass overrides the
3089 * start method, it should call gst_base_src_start_complete() when the start
3090 * operation completes either from the same thread or from an asynchronous
3094 gst_base_src_start_complete (GstBaseSrc * basesrc, GstFlowReturn ret)
3103 if (ret != GST_FLOW_OK)
3106 GST_DEBUG_OBJECT (basesrc, "starting source");
3107 format = basesrc->segment.format;
3109 /* figure out the size */
3112 if (format == GST_FORMAT_BYTES) {
3113 GstBaseSrcClass *bclass = GST_BASE_SRC_GET_CLASS (basesrc);
3115 if (bclass->get_size) {
3116 if (!(have_size = bclass->get_size (basesrc, &size)))
3119 GST_DEBUG_OBJECT (basesrc, "setting size %" G_GUINT64_FORMAT, size);
3120 /* only update the size when operating in bytes, subclass is supposed
3121 * to set duration in the start method for other formats */
3122 GST_OBJECT_LOCK (basesrc);
3123 basesrc->segment.duration = size;
3124 GST_OBJECT_UNLOCK (basesrc);
3127 GST_DEBUG_OBJECT (basesrc,
3128 "format: %s, have size: %d, size: %" G_GUINT64_FORMAT ", duration: %"
3129 G_GINT64_FORMAT, gst_format_get_name (format), have_size, size,
3130 basesrc->segment.duration);
3132 seekable = gst_base_src_seekable (basesrc);
3133 GST_DEBUG_OBJECT (basesrc, "is seekable: %d", seekable);
3135 /* update for random access flag */
3136 basesrc->random_access = seekable && format == GST_FORMAT_BYTES;
3138 GST_DEBUG_OBJECT (basesrc, "is random_access: %d", basesrc->random_access);
3140 /* stop flushing now but for live sources, still block in the LIVE lock when
3141 * we are not yet PLAYING */
3142 gst_base_src_set_flushing (basesrc, FALSE, FALSE, NULL);
3144 gst_pad_mark_reconfigure (GST_BASE_SRC_PAD (basesrc));
3146 GST_OBJECT_LOCK (basesrc->srcpad);
3147 mode = GST_PAD_MODE (basesrc->srcpad);
3148 GST_OBJECT_UNLOCK (basesrc->srcpad);
3150 /* take the stream lock here, we only want to let the task run when we have
3151 * set the STARTED flag */
3152 GST_PAD_STREAM_LOCK (basesrc->srcpad);
3153 if (mode == GST_PAD_MODE_PUSH) {
3154 /* do initial seek, which will start the task */
3155 GST_OBJECT_LOCK (basesrc);
3156 event = basesrc->pending_seek;
3157 basesrc->pending_seek = NULL;
3158 GST_OBJECT_UNLOCK (basesrc);
3160 /* The perform seek code will start the task when finished. */
3161 if (G_UNLIKELY (!gst_base_src_perform_seek (basesrc, event)))
3165 gst_event_unref (event);
3167 /* if not random_access, we cannot operate in pull mode for now */
3168 if (G_UNLIKELY (!basesrc->random_access))
3172 GST_LIVE_LOCK (basesrc);
3173 GST_OBJECT_FLAG_SET (basesrc, GST_BASE_SRC_FLAG_STARTED);
3174 GST_OBJECT_FLAG_UNSET (basesrc, GST_BASE_SRC_FLAG_STARTING);
3175 basesrc->priv->start_result = ret;
3176 GST_LIVE_SIGNAL (basesrc);
3177 GST_LIVE_UNLOCK (basesrc);
3179 GST_PAD_STREAM_UNLOCK (basesrc->srcpad);
3185 GST_PAD_STREAM_UNLOCK (basesrc->srcpad);
3186 GST_ERROR_OBJECT (basesrc, "Failed to perform initial seek");
3187 gst_base_src_set_flushing (basesrc, TRUE, FALSE, NULL);
3189 gst_event_unref (event);
3190 ret = GST_FLOW_ERROR;
3195 GST_PAD_STREAM_UNLOCK (basesrc->srcpad);
3196 gst_base_src_set_flushing (basesrc, TRUE, FALSE, NULL);
3197 GST_ERROR_OBJECT (basesrc, "Cannot operate in pull mode, stopping");
3198 ret = GST_FLOW_ERROR;
3203 GST_LIVE_LOCK (basesrc);
3204 basesrc->priv->start_result = ret;
3205 GST_OBJECT_FLAG_UNSET (basesrc, GST_BASE_SRC_FLAG_STARTING);
3206 GST_LIVE_SIGNAL (basesrc);
3207 GST_LIVE_UNLOCK (basesrc);
3213 * gst_base_src_start_wait:
3214 * @src: base source instance
3215 * @ret: a #GstFlowReturn
3217 * Wait until the start operation completes.
3219 * Returns: a #GstFlowReturn.
3222 gst_base_src_start_wait (GstBaseSrc * basesrc)
3224 GstFlowReturn result;
3226 GST_LIVE_LOCK (basesrc);
3227 if (G_UNLIKELY (basesrc->priv->flushing))
3230 while (GST_BASE_SRC_IS_STARTING (basesrc)) {
3231 GST_LIVE_WAIT (basesrc);
3232 if (G_UNLIKELY (basesrc->priv->flushing))
3235 result = basesrc->priv->start_result;
3236 GST_LIVE_UNLOCK (basesrc);
3243 GST_DEBUG_OBJECT (basesrc, "we are flushing");
3244 GST_LIVE_UNLOCK (basesrc);
3245 return GST_FLOW_FLUSHING;
3250 gst_base_src_stop (GstBaseSrc * basesrc)
3252 GstBaseSrcClass *bclass;
3253 gboolean result = TRUE;
3255 GST_DEBUG_OBJECT (basesrc, "stopping source");
3258 gst_base_src_set_flushing (basesrc, TRUE, FALSE, NULL);
3260 gst_pad_stop_task (basesrc->srcpad);
3262 GST_LIVE_LOCK (basesrc);
3263 if (!GST_BASE_SRC_IS_STARTED (basesrc) && !GST_BASE_SRC_IS_STARTING (basesrc))
3266 GST_OBJECT_FLAG_UNSET (basesrc, GST_BASE_SRC_FLAG_STARTING);
3267 GST_OBJECT_FLAG_UNSET (basesrc, GST_BASE_SRC_FLAG_STARTED);
3268 basesrc->priv->start_result = GST_FLOW_FLUSHING;
3269 GST_LIVE_SIGNAL (basesrc);
3270 GST_LIVE_UNLOCK (basesrc);
3272 bclass = GST_BASE_SRC_GET_CLASS (basesrc);
3274 result = bclass->stop (basesrc);
3276 gst_base_src_set_allocation (basesrc, NULL, NULL, NULL);
3282 GST_DEBUG_OBJECT (basesrc, "was started");
3283 GST_LIVE_UNLOCK (basesrc);
3288 /* start or stop flushing dataprocessing
3291 gst_base_src_set_flushing (GstBaseSrc * basesrc,
3292 gboolean flushing, gboolean live_play, gboolean * playing)
3294 GstBaseSrcClass *bclass;
3296 bclass = GST_BASE_SRC_GET_CLASS (basesrc);
3299 gst_base_src_activate_pool (basesrc, FALSE);
3300 /* unlock any subclasses, we need to do this before grabbing the
3301 * LIVE_LOCK since we hold this lock before going into ::create. We pass an
3302 * unlock to the params because of backwards compat (see seek handler)*/
3304 bclass->unlock (basesrc);
3307 /* the live lock is released when we are blocked, waiting for playing or
3308 * when we sync to the clock. */
3309 GST_LIVE_LOCK (basesrc);
3311 *playing = basesrc->live_running;
3312 basesrc->priv->flushing = flushing;
3314 /* if we are locked in the live lock, signal it to make it flush */
3315 basesrc->live_running = TRUE;
3317 /* clear pending EOS if any */
3318 g_atomic_int_set (&basesrc->priv->pending_eos, FALSE);
3320 /* step 1, now that we have the LIVE lock, clear our unlock request */
3321 if (bclass->unlock_stop)
3322 bclass->unlock_stop (basesrc);
3324 /* step 2, unblock clock sync (if any) or any other blocking thing */
3325 if (basesrc->clock_id)
3326 gst_clock_id_unschedule (basesrc->clock_id);
3328 /* signal the live source that it can start playing */
3329 basesrc->live_running = live_play;
3331 gst_base_src_activate_pool (basesrc, TRUE);
3333 /* Drop all delayed events */
3334 GST_OBJECT_LOCK (basesrc);
3335 if (basesrc->priv->pending_events) {
3336 g_list_foreach (basesrc->priv->pending_events, (GFunc) gst_event_unref,
3338 g_list_free (basesrc->priv->pending_events);
3339 basesrc->priv->pending_events = NULL;
3340 g_atomic_int_set (&basesrc->priv->have_events, FALSE);
3342 GST_OBJECT_UNLOCK (basesrc);
3344 GST_LIVE_SIGNAL (basesrc);
3345 GST_LIVE_UNLOCK (basesrc);
3350 /* the purpose of this function is to make sure that a live source blocks in the
3351 * LIVE lock or leaves the LIVE lock and continues playing. */
3353 gst_base_src_set_playing (GstBaseSrc * basesrc, gboolean live_play)
3355 GstBaseSrcClass *bclass;
3357 bclass = GST_BASE_SRC_GET_CLASS (basesrc);
3359 /* unlock subclasses locked in ::create, we only do this when we stop playing. */
3361 GST_DEBUG_OBJECT (basesrc, "unlock");
3363 bclass->unlock (basesrc);
3366 /* we are now able to grab the LIVE lock, when we get it, we can be
3367 * waiting for PLAYING while blocked in the LIVE cond or we can be waiting
3369 GST_LIVE_LOCK (basesrc);
3370 GST_DEBUG_OBJECT (basesrc, "unschedule clock");
3372 /* unblock clock sync (if any) */
3373 if (basesrc->clock_id)
3374 gst_clock_id_unschedule (basesrc->clock_id);
3376 /* configure what to do when we get to the LIVE lock. */
3377 GST_DEBUG_OBJECT (basesrc, "live running %d", live_play);
3378 basesrc->live_running = live_play;
3383 /* clear our unlock request when going to PLAYING */
3384 GST_DEBUG_OBJECT (basesrc, "unlock stop");
3385 if (bclass->unlock_stop)
3386 bclass->unlock_stop (basesrc);
3388 /* for live sources we restart the timestamp correction */
3389 basesrc->priv->latency = -1;
3390 /* have to restart the task in case it stopped because of the unlock when
3391 * we went to PAUSED. Only do this if we operating in push mode. */
3392 GST_OBJECT_LOCK (basesrc->srcpad);
3393 start = (GST_PAD_MODE (basesrc->srcpad) == GST_PAD_MODE_PUSH);
3394 GST_OBJECT_UNLOCK (basesrc->srcpad);
3396 gst_pad_start_task (basesrc->srcpad, (GstTaskFunction) gst_base_src_loop,
3398 GST_DEBUG_OBJECT (basesrc, "signal");
3399 GST_LIVE_SIGNAL (basesrc);
3401 GST_LIVE_UNLOCK (basesrc);
3407 gst_base_src_activate_push (GstPad * pad, GstObject * parent, gboolean active)
3409 GstBaseSrc *basesrc;
3411 basesrc = GST_BASE_SRC (parent);
3413 /* prepare subclass first */
3415 GST_DEBUG_OBJECT (basesrc, "Activating in push mode");
3417 if (G_UNLIKELY (!basesrc->can_activate_push))
3418 goto no_push_activation;
3420 if (G_UNLIKELY (!gst_base_src_start (basesrc)))
3423 GST_DEBUG_OBJECT (basesrc, "Deactivating in push mode");
3424 /* now we can stop the source */
3425 if (G_UNLIKELY (!gst_base_src_stop (basesrc)))
3433 GST_WARNING_OBJECT (basesrc, "Subclass disabled push-mode activation");
3438 GST_WARNING_OBJECT (basesrc, "Failed to start in push mode");
3443 GST_DEBUG_OBJECT (basesrc, "Failed to stop in push mode");
3449 gst_base_src_activate_pull (GstPad * pad, GstObject * parent, gboolean active)
3451 GstBaseSrc *basesrc;
3453 basesrc = GST_BASE_SRC (parent);
3455 /* prepare subclass first */
3457 GST_DEBUG_OBJECT (basesrc, "Activating in pull mode");
3458 if (G_UNLIKELY (!gst_base_src_start (basesrc)))
3461 GST_DEBUG_OBJECT (basesrc, "Deactivating in pull mode");
3462 if (G_UNLIKELY (!gst_base_src_stop (basesrc)))
3470 GST_ERROR_OBJECT (basesrc, "Failed to start in pull mode");
3475 GST_ERROR_OBJECT (basesrc, "Failed to stop in pull mode");
3481 gst_base_src_activate_mode (GstPad * pad, GstObject * parent,
3482 GstPadMode mode, gboolean active)
3487 case GST_PAD_MODE_PULL:
3488 res = gst_base_src_activate_pull (pad, parent, active);
3490 case GST_PAD_MODE_PUSH:
3491 res = gst_base_src_activate_push (pad, parent, active);
3494 GST_LOG_OBJECT (pad, "unknown activation mode %d", mode);
3502 static GstStateChangeReturn
3503 gst_base_src_change_state (GstElement * element, GstStateChange transition)
3505 GstBaseSrc *basesrc;
3506 GstStateChangeReturn result;
3507 gboolean no_preroll = FALSE;
3509 basesrc = GST_BASE_SRC (element);
3511 switch (transition) {
3512 case GST_STATE_CHANGE_NULL_TO_READY:
3514 case GST_STATE_CHANGE_READY_TO_PAUSED:
3515 basesrc->priv->stream_start_pending = TRUE;
3516 no_preroll = gst_base_src_is_live (basesrc);
3518 case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
3519 GST_DEBUG_OBJECT (basesrc, "PAUSED->PLAYING");
3520 if (gst_base_src_is_live (basesrc)) {
3521 /* now we can start playback */
3522 gst_base_src_set_playing (basesrc, TRUE);
3530 GST_ELEMENT_CLASS (parent_class)->change_state (element,
3531 transition)) == GST_STATE_CHANGE_FAILURE)
3534 switch (transition) {
3535 case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
3536 GST_DEBUG_OBJECT (basesrc, "PLAYING->PAUSED");
3537 if (gst_base_src_is_live (basesrc)) {
3538 /* make sure we block in the live lock in PAUSED */
3539 gst_base_src_set_playing (basesrc, FALSE);
3543 case GST_STATE_CHANGE_PAUSED_TO_READY:
3545 /* we don't need to unblock anything here, the pad deactivation code
3546 * already did this */
3547 g_atomic_int_set (&basesrc->priv->pending_eos, FALSE);
3548 gst_event_replace (&basesrc->pending_seek, NULL);
3549 basesrc->priv->stream_start_pending = FALSE;
3552 case GST_STATE_CHANGE_READY_TO_NULL:
3558 if (no_preroll && result == GST_STATE_CHANGE_SUCCESS)
3559 result = GST_STATE_CHANGE_NO_PREROLL;
3566 GST_DEBUG_OBJECT (basesrc, "parent failed state change");