2 * Copyright (C) 2007 David Schleef <ds@schleef.org>
3 * (C) 2008 Wim Taymans <wim.taymans@gmail.com>
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Library General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Library General Public License for more details.
15 * You should have received a copy of the GNU Library General Public
16 * License along with this library; if not, write to the
17 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 * Boston, MA 02111-1307, USA.
22 * @short_description: Easy way for applications to inject buffers into a
24 * @see_also: #GstBaseSrc, appsink
26 * The appsrc element can be used by applications to insert data into a
27 * GStreamer pipeline. Unlike most GStreamer elements, Appsrc provides
28 * external API functions.
30 * appsrc can be used by linking with the libgstapp library to access the
31 * methods directly or by using the appsrc action signals.
33 * Before operating appsrc, the caps property must be set to a fixed caps
34 * describing the format of the data that will be pushed with appsrc. An
35 * exception to this is when pushing buffers with unknown caps, in which case no
36 * caps should be set. This is typically true of file-like sources that push raw
39 * The main way of handing data to the appsrc element is by calling the
40 * gst_app_src_push_buffer() method or by emitting the push-buffer action signal.
41 * This will put the buffer onto a queue from which appsrc will read from in its
42 * streaming thread. It is important to note that data transport will not happen
43 * from the thread that performed the push-buffer call.
45 * The "max-bytes" property controls how much data can be queued in appsrc
46 * before appsrc considers the queue full. A filled internal queue will always
47 * signal the "enough-data" signal, which signals the application that it should
48 * stop pushing data into appsrc. The "block" property will cause appsrc to
49 * block the push-buffer method until free data becomes available again.
51 * When the internal queue is running out of data, the "need-data" signal is
52 * emitted, which signals the application that it should start pushing more data
55 * In addition to the "need-data" and "enough-data" signals, appsrc can emit the
56 * "seek-data" signal when the "stream-mode" property is set to "seekable" or
57 * "random-access". The signal argument will contain the new desired position in
58 * the stream expressed in the unit set with the "format" property. After
59 * receiving the seek-data signal, the application should push-buffers from the
62 * These signals allow the application to operate the appsrc in two different
65 * The push model, in which the application repeatedly calls the push-buffer method
66 * with a new buffer. Optionally, the queue size in the appsrc can be controlled
67 * with the enough-data and need-data signals by respectively stopping/starting
68 * the push-buffer calls. This is a typical mode of operation for the
69 * stream-type "stream" and "seekable". Use this model when implementing various
70 * network protocols or hardware devices.
72 * The pull model where the need-data signal triggers the next push-buffer call.
73 * This mode is typically used in the "random-access" stream-type. Use this
74 * model for file access or other randomly accessable sources. In this mode, a
75 * buffer of exactly the amount of bytes given by the need-data signal should be
78 * In all modes, the size property on appsrc should contain the total stream
79 * size in bytes. Setting this property is mandatory in the random-access mode.
80 * For the stream and seekable modes, setting this property is optional but
83 * When the application is finished pushing data into appsrc, it should call
84 * gst_app_src_end_of_stream() or emit the end-of-stream action signal. After
85 * this call, no more buffers can be pushed into appsrc until a flushing seek
86 * happened or the state of the appsrc has gone through READY.
88 * Last reviewed on 2008-12-17 (0.10.10)
98 #include <gst/base/gstbasesrc.h>
102 #include "gstapp-marshal.h"
103 #include "gstappsrc.h"
105 #include "gst/glib-compat-private.h"
107 struct _GstAppSrcPrivate
115 GstAppStreamType stream_type;
123 guint64 queued_bytes;
125 GstAppStreamType current_type;
129 gboolean emit_signals;
132 GstAppSrcCallbacks callbacks;
134 GDestroyNotify notify;
137 GST_DEBUG_CATEGORY_STATIC (app_src_debug);
138 #define GST_CAT_DEFAULT app_src_debug
149 SIGNAL_END_OF_STREAM,
154 #define DEFAULT_PROP_SIZE -1
155 #define DEFAULT_PROP_STREAM_TYPE GST_APP_STREAM_TYPE_STREAM
156 #define DEFAULT_PROP_MAX_BYTES 200000
157 #define DEFAULT_PROP_FORMAT GST_FORMAT_BYTES
158 #define DEFAULT_PROP_BLOCK FALSE
159 #define DEFAULT_PROP_IS_LIVE FALSE
160 #define DEFAULT_PROP_MIN_LATENCY -1
161 #define DEFAULT_PROP_MAX_LATENCY -1
162 #define DEFAULT_PROP_EMIT_SIGNALS TRUE
163 #define DEFAULT_PROP_MIN_PERCENT 0
182 static GstStaticPadTemplate gst_app_src_template =
183 GST_STATIC_PAD_TEMPLATE ("src",
186 GST_STATIC_CAPS_ANY);
189 gst_app_stream_type_get_type (void)
191 static volatile gsize stream_type_type = 0;
192 static const GEnumValue stream_type[] = {
193 {GST_APP_STREAM_TYPE_STREAM, "GST_APP_STREAM_TYPE_STREAM", "stream"},
194 {GST_APP_STREAM_TYPE_SEEKABLE, "GST_APP_STREAM_TYPE_SEEKABLE", "seekable"},
195 {GST_APP_STREAM_TYPE_RANDOM_ACCESS, "GST_APP_STREAM_TYPE_RANDOM_ACCESS",
200 if (g_once_init_enter (&stream_type_type)) {
201 GType tmp = g_enum_register_static ("GstAppStreamType", stream_type);
202 g_once_init_leave (&stream_type_type, tmp);
205 return (GType) stream_type_type;
208 static void gst_app_src_uri_handler_init (gpointer g_iface,
209 gpointer iface_data);
211 static void gst_app_src_dispose (GObject * object);
212 static void gst_app_src_finalize (GObject * object);
214 static void gst_app_src_set_property (GObject * object, guint prop_id,
215 const GValue * value, GParamSpec * pspec);
216 static void gst_app_src_get_property (GObject * object, guint prop_id,
217 GValue * value, GParamSpec * pspec);
219 static void gst_app_src_set_latencies (GstAppSrc * appsrc,
220 gboolean do_min, guint64 min, gboolean do_max, guint64 max);
222 static gboolean gst_app_src_negotiate (GstBaseSrc * basesrc);
223 static GstFlowReturn gst_app_src_create (GstBaseSrc * bsrc,
224 guint64 offset, guint size, GstBuffer ** buf);
225 static gboolean gst_app_src_start (GstBaseSrc * bsrc);
226 static gboolean gst_app_src_stop (GstBaseSrc * bsrc);
227 static gboolean gst_app_src_unlock (GstBaseSrc * bsrc);
228 static gboolean gst_app_src_unlock_stop (GstBaseSrc * bsrc);
229 static gboolean gst_app_src_do_seek (GstBaseSrc * src, GstSegment * segment);
230 static gboolean gst_app_src_is_seekable (GstBaseSrc * src);
231 static gboolean gst_app_src_do_get_size (GstBaseSrc * src, guint64 * size);
232 static gboolean gst_app_src_query (GstBaseSrc * src, GstQuery * query);
234 static GstFlowReturn gst_app_src_push_buffer_action (GstAppSrc * appsrc,
237 static guint gst_app_src_signals[LAST_SIGNAL] = { 0 };
239 #define gst_app_src_parent_class parent_class
240 G_DEFINE_TYPE_WITH_CODE (GstAppSrc, gst_app_src, GST_TYPE_BASE_SRC,
241 G_IMPLEMENT_INTERFACE (GST_TYPE_URI_HANDLER, gst_app_src_uri_handler_init));
244 gst_app_src_class_init (GstAppSrcClass * klass)
246 GObjectClass *gobject_class = (GObjectClass *) klass;
247 GstElementClass *element_class = (GstElementClass *) klass;
248 GstBaseSrcClass *basesrc_class = (GstBaseSrcClass *) klass;
250 GST_DEBUG_CATEGORY_INIT (app_src_debug, "appsrc", 0, "appsrc element");
252 gobject_class->dispose = gst_app_src_dispose;
253 gobject_class->finalize = gst_app_src_finalize;
255 gobject_class->set_property = gst_app_src_set_property;
256 gobject_class->get_property = gst_app_src_get_property;
261 * The GstCaps that will negotiated downstream and will be put
262 * on outgoing buffers.
264 g_object_class_install_property (gobject_class, PROP_CAPS,
265 g_param_spec_boxed ("caps", "Caps",
266 "The allowed caps for the src pad", GST_TYPE_CAPS,
267 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
271 * The format to use for segment events. When the source is producing
272 * timestamped buffers this property should be set to GST_FORMAT_TIME.
274 g_object_class_install_property (gobject_class, PROP_FORMAT,
275 g_param_spec_enum ("format", "Format",
276 "The format of the segment events and seek", GST_TYPE_FORMAT,
277 DEFAULT_PROP_FORMAT, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
281 * The total size in bytes of the data stream. If the total size is known, it
282 * is recommended to configure it with this property.
284 g_object_class_install_property (gobject_class, PROP_SIZE,
285 g_param_spec_int64 ("size", "Size",
286 "The size of the data stream in bytes (-1 if unknown)",
287 -1, G_MAXINT64, DEFAULT_PROP_SIZE,
288 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
290 * GstAppSrc::stream-type
292 * The type of stream that this source is producing. For seekable streams the
293 * application should connect to the seek-data signal.
295 g_object_class_install_property (gobject_class, PROP_STREAM_TYPE,
296 g_param_spec_enum ("stream-type", "Stream Type",
297 "the type of the stream", GST_TYPE_APP_STREAM_TYPE,
298 DEFAULT_PROP_STREAM_TYPE,
299 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
301 * GstAppSrc::max-bytes
303 * The maximum amount of bytes that can be queued internally.
304 * After the maximum amount of bytes are queued, appsrc will emit the
305 * "enough-data" signal.
307 g_object_class_install_property (gobject_class, PROP_MAX_BYTES,
308 g_param_spec_uint64 ("max-bytes", "Max bytes",
309 "The maximum number of bytes to queue internally (0 = unlimited)",
310 0, G_MAXUINT64, DEFAULT_PROP_MAX_BYTES,
311 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
315 * When max-bytes are queued and after the enough-data signal has been emitted,
316 * block any further push-buffer calls until the amount of queued bytes drops
317 * below the max-bytes limit.
319 g_object_class_install_property (gobject_class, PROP_BLOCK,
320 g_param_spec_boolean ("block", "Block",
321 "Block push-buffer when max-bytes are queued",
322 DEFAULT_PROP_BLOCK, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
327 * Instruct the source to behave like a live source. This includes that it
328 * will only push out buffers in the PLAYING state.
330 g_object_class_install_property (gobject_class, PROP_IS_LIVE,
331 g_param_spec_boolean ("is-live", "Is Live",
332 "Whether to act as a live source",
333 DEFAULT_PROP_IS_LIVE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
335 * GstAppSrc::min-latency
337 * The minimum latency of the source. A value of -1 will use the default
338 * latency calculations of #GstBaseSrc.
340 g_object_class_install_property (gobject_class, PROP_MIN_LATENCY,
341 g_param_spec_int64 ("min-latency", "Min Latency",
342 "The minimum latency (-1 = default)",
343 -1, G_MAXINT64, DEFAULT_PROP_MIN_LATENCY,
344 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
346 * GstAppSrc::max-latency
348 * The maximum latency of the source. A value of -1 means an unlimited amout
351 g_object_class_install_property (gobject_class, PROP_MAX_LATENCY,
352 g_param_spec_int64 ("max-latency", "Max Latency",
353 "The maximum latency (-1 = unlimited)",
354 -1, G_MAXINT64, DEFAULT_PROP_MAX_LATENCY,
355 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
358 * GstAppSrc::emit-signals
360 * Make appsrc emit the "need-data", "enough-data" and "seek-data" signals.
361 * This option is by default enabled for backwards compatibility reasons but
362 * can disabled when needed because signal emission is expensive.
366 g_object_class_install_property (gobject_class, PROP_EMIT_SIGNALS,
367 g_param_spec_boolean ("emit-signals", "Emit signals",
368 "Emit need-data, enough-data and seek-data signals",
369 DEFAULT_PROP_EMIT_SIGNALS,
370 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
373 * GstAppSrc::empty-percent
375 * Make appsrc emit the "need-data" signal when the amount of bytes in the
376 * queue drops below this percentage of max-bytes.
380 g_object_class_install_property (gobject_class, PROP_MIN_PERCENT,
381 g_param_spec_uint ("min-percent", "Min Percent",
382 "Emit need-data when queued bytes drops below this percent of max-bytes",
383 0, 100, DEFAULT_PROP_MIN_PERCENT,
384 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
387 * GstAppSrc::need-data:
388 * @appsrc: the appsrc element that emitted the signal
389 * @length: the amount of bytes needed.
391 * Signal that the source needs more data. In the callback or from another
392 * thread you should call push-buffer or end-of-stream.
394 * @length is just a hint and when it is set to -1, any number of bytes can be
395 * pushed into @appsrc.
397 * You can call push-buffer multiple times until the enough-data signal is
400 gst_app_src_signals[SIGNAL_NEED_DATA] =
401 g_signal_new ("need-data", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
402 G_STRUCT_OFFSET (GstAppSrcClass, need_data),
403 NULL, NULL, __gst_app_marshal_VOID__UINT, G_TYPE_NONE, 1, G_TYPE_UINT);
406 * GstAppSrc::enough-data:
407 * @appsrc: the appsrc element that emitted the signal
409 * Signal that the source has enough data. It is recommended that the
410 * application stops calling push-buffer until the need-data signal is
411 * emitted again to avoid excessive buffer queueing.
413 gst_app_src_signals[SIGNAL_ENOUGH_DATA] =
414 g_signal_new ("enough-data", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
415 G_STRUCT_OFFSET (GstAppSrcClass, enough_data),
416 NULL, NULL, g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0, G_TYPE_NONE);
419 * GstAppSrc::seek-data:
420 * @appsrc: the appsrc element that emitted the signal
421 * @offset: the offset to seek to
423 * Seek to the given offset. The next push-buffer should produce buffers from
425 * This callback is only called for seekable stream types.
427 * Returns: %TRUE if the seek succeeded.
429 gst_app_src_signals[SIGNAL_SEEK_DATA] =
430 g_signal_new ("seek-data", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
431 G_STRUCT_OFFSET (GstAppSrcClass, seek_data),
432 NULL, NULL, __gst_app_marshal_BOOLEAN__UINT64, G_TYPE_BOOLEAN, 1,
436 * GstAppSrc::push-buffer:
437 * @appsrc: the appsrc
438 * @buffer: a buffer to push
440 * Adds a buffer to the queue of buffers that the appsrc element will
441 * push to its source pad. This function does not take ownership of the
442 * buffer so the buffer needs to be unreffed after calling this function.
444 * When the block property is TRUE, this function can block until free space
445 * becomes available in the queue.
447 gst_app_src_signals[SIGNAL_PUSH_BUFFER] =
448 g_signal_new ("push-buffer", G_TYPE_FROM_CLASS (klass),
449 G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION, G_STRUCT_OFFSET (GstAppSrcClass,
450 push_buffer), NULL, NULL, __gst_app_marshal_ENUM__BOXED,
451 GST_TYPE_FLOW_RETURN, 1, GST_TYPE_BUFFER);
454 * GstAppSrc::end-of-stream:
455 * @appsrc: the appsrc
457 * Notify @appsrc that no more buffer are available.
459 gst_app_src_signals[SIGNAL_END_OF_STREAM] =
460 g_signal_new ("end-of-stream", G_TYPE_FROM_CLASS (klass),
461 G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION, G_STRUCT_OFFSET (GstAppSrcClass,
462 end_of_stream), NULL, NULL, __gst_app_marshal_ENUM__VOID,
463 GST_TYPE_FLOW_RETURN, 0, G_TYPE_NONE);
465 gst_element_class_set_details_simple (element_class, "AppSrc",
466 "Generic/Source", "Allow the application to feed buffers to a pipeline",
467 "David Schleef <ds@schleef.org>, Wim Taymans <wim.taymans@gmail.com>");
469 gst_element_class_add_pad_template (element_class,
470 gst_static_pad_template_get (&gst_app_src_template));
472 basesrc_class->negotiate = gst_app_src_negotiate;
473 basesrc_class->create = gst_app_src_create;
474 basesrc_class->start = gst_app_src_start;
475 basesrc_class->stop = gst_app_src_stop;
476 basesrc_class->unlock = gst_app_src_unlock;
477 basesrc_class->unlock_stop = gst_app_src_unlock_stop;
478 basesrc_class->do_seek = gst_app_src_do_seek;
479 basesrc_class->is_seekable = gst_app_src_is_seekable;
480 basesrc_class->get_size = gst_app_src_do_get_size;
481 basesrc_class->get_size = gst_app_src_do_get_size;
482 basesrc_class->query = gst_app_src_query;
484 klass->push_buffer = gst_app_src_push_buffer_action;
485 klass->end_of_stream = gst_app_src_end_of_stream;
487 g_type_class_add_private (klass, sizeof (GstAppSrcPrivate));
491 gst_app_src_init (GstAppSrc * appsrc)
493 GstAppSrcPrivate *priv;
495 priv = appsrc->priv = G_TYPE_INSTANCE_GET_PRIVATE (appsrc, GST_TYPE_APP_SRC,
498 priv->mutex = g_mutex_new ();
499 priv->cond = g_cond_new ();
500 priv->queue = g_queue_new ();
502 priv->size = DEFAULT_PROP_SIZE;
503 priv->stream_type = DEFAULT_PROP_STREAM_TYPE;
504 priv->max_bytes = DEFAULT_PROP_MAX_BYTES;
505 priv->format = DEFAULT_PROP_FORMAT;
506 priv->block = DEFAULT_PROP_BLOCK;
507 priv->min_latency = DEFAULT_PROP_MIN_LATENCY;
508 priv->max_latency = DEFAULT_PROP_MAX_LATENCY;
509 priv->emit_signals = DEFAULT_PROP_EMIT_SIGNALS;
510 priv->min_percent = DEFAULT_PROP_MIN_PERCENT;
512 gst_base_src_set_live (GST_BASE_SRC (appsrc), DEFAULT_PROP_IS_LIVE);
516 gst_app_src_flush_queued (GstAppSrc * src)
519 GstAppSrcPrivate *priv = src->priv;
521 while ((buf = g_queue_pop_head (priv->queue)))
522 gst_buffer_unref (buf);
523 priv->queued_bytes = 0;
527 gst_app_src_dispose (GObject * obj)
529 GstAppSrc *appsrc = GST_APP_SRC_CAST (obj);
530 GstAppSrcPrivate *priv = appsrc->priv;
533 gst_caps_unref (priv->caps);
536 gst_app_src_flush_queued (appsrc);
538 G_OBJECT_CLASS (parent_class)->dispose (obj);
542 gst_app_src_finalize (GObject * obj)
544 GstAppSrc *appsrc = GST_APP_SRC_CAST (obj);
545 GstAppSrcPrivate *priv = appsrc->priv;
547 g_mutex_free (priv->mutex);
548 g_cond_free (priv->cond);
549 g_queue_free (priv->queue);
551 G_OBJECT_CLASS (parent_class)->finalize (obj);
555 gst_app_src_set_property (GObject * object, guint prop_id,
556 const GValue * value, GParamSpec * pspec)
558 GstAppSrc *appsrc = GST_APP_SRC_CAST (object);
559 GstAppSrcPrivate *priv = appsrc->priv;
563 gst_app_src_set_caps (appsrc, gst_value_get_caps (value));
566 gst_app_src_set_size (appsrc, g_value_get_int64 (value));
568 case PROP_STREAM_TYPE:
569 gst_app_src_set_stream_type (appsrc, g_value_get_enum (value));
572 gst_app_src_set_max_bytes (appsrc, g_value_get_uint64 (value));
575 priv->format = g_value_get_enum (value);
578 priv->block = g_value_get_boolean (value);
581 gst_base_src_set_live (GST_BASE_SRC (appsrc),
582 g_value_get_boolean (value));
584 case PROP_MIN_LATENCY:
585 gst_app_src_set_latencies (appsrc, TRUE, g_value_get_int64 (value),
588 case PROP_MAX_LATENCY:
589 gst_app_src_set_latencies (appsrc, FALSE, -1, TRUE,
590 g_value_get_int64 (value));
592 case PROP_EMIT_SIGNALS:
593 gst_app_src_set_emit_signals (appsrc, g_value_get_boolean (value));
595 case PROP_MIN_PERCENT:
596 priv->min_percent = g_value_get_uint (value);
599 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
605 gst_app_src_get_property (GObject * object, guint prop_id, GValue * value,
608 GstAppSrc *appsrc = GST_APP_SRC_CAST (object);
609 GstAppSrcPrivate *priv = appsrc->priv;
616 /* we're missing a _take_caps() function to transfer ownership */
617 caps = gst_app_src_get_caps (appsrc);
618 gst_value_set_caps (value, caps);
620 gst_caps_unref (caps);
624 g_value_set_int64 (value, gst_app_src_get_size (appsrc));
626 case PROP_STREAM_TYPE:
627 g_value_set_enum (value, gst_app_src_get_stream_type (appsrc));
630 g_value_set_uint64 (value, gst_app_src_get_max_bytes (appsrc));
633 g_value_set_enum (value, priv->format);
636 g_value_set_boolean (value, priv->block);
639 g_value_set_boolean (value, gst_base_src_is_live (GST_BASE_SRC (appsrc)));
641 case PROP_MIN_LATENCY:
645 gst_app_src_get_latency (appsrc, &min, NULL);
646 g_value_set_int64 (value, min);
649 case PROP_MAX_LATENCY:
653 gst_app_src_get_latency (appsrc, &max, NULL);
654 g_value_set_int64 (value, max);
657 case PROP_EMIT_SIGNALS:
658 g_value_set_boolean (value, gst_app_src_get_emit_signals (appsrc));
660 case PROP_MIN_PERCENT:
661 g_value_set_uint (value, priv->min_percent);
664 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
670 gst_app_src_unlock (GstBaseSrc * bsrc)
672 GstAppSrc *appsrc = GST_APP_SRC_CAST (bsrc);
673 GstAppSrcPrivate *priv = appsrc->priv;
675 g_mutex_lock (priv->mutex);
676 GST_DEBUG_OBJECT (appsrc, "unlock start");
677 priv->flushing = TRUE;
678 g_cond_broadcast (priv->cond);
679 g_mutex_unlock (priv->mutex);
685 gst_app_src_unlock_stop (GstBaseSrc * bsrc)
687 GstAppSrc *appsrc = GST_APP_SRC_CAST (bsrc);
688 GstAppSrcPrivate *priv = appsrc->priv;
690 g_mutex_lock (priv->mutex);
691 GST_DEBUG_OBJECT (appsrc, "unlock stop");
692 priv->flushing = FALSE;
693 g_cond_broadcast (priv->cond);
694 g_mutex_unlock (priv->mutex);
700 gst_app_src_start (GstBaseSrc * bsrc)
702 GstAppSrc *appsrc = GST_APP_SRC_CAST (bsrc);
703 GstAppSrcPrivate *priv = appsrc->priv;
705 g_mutex_lock (priv->mutex);
706 GST_DEBUG_OBJECT (appsrc, "starting");
707 priv->started = TRUE;
708 /* set the offset to -1 so that we always do a first seek. This is only used
709 * in random-access mode. */
711 priv->flushing = FALSE;
712 g_mutex_unlock (priv->mutex);
714 gst_base_src_set_format (bsrc, priv->format);
720 gst_app_src_stop (GstBaseSrc * bsrc)
722 GstAppSrc *appsrc = GST_APP_SRC_CAST (bsrc);
723 GstAppSrcPrivate *priv = appsrc->priv;
725 g_mutex_lock (priv->mutex);
726 GST_DEBUG_OBJECT (appsrc, "stopping");
727 priv->is_eos = FALSE;
728 priv->flushing = TRUE;
729 priv->started = FALSE;
730 gst_app_src_flush_queued (appsrc);
731 g_mutex_unlock (priv->mutex);
737 gst_app_src_is_seekable (GstBaseSrc * src)
739 GstAppSrc *appsrc = GST_APP_SRC_CAST (src);
740 GstAppSrcPrivate *priv = appsrc->priv;
741 gboolean res = FALSE;
743 switch (priv->stream_type) {
744 case GST_APP_STREAM_TYPE_STREAM:
746 case GST_APP_STREAM_TYPE_SEEKABLE:
747 case GST_APP_STREAM_TYPE_RANDOM_ACCESS:
755 gst_app_src_do_get_size (GstBaseSrc * src, guint64 * size)
757 GstAppSrc *appsrc = GST_APP_SRC_CAST (src);
759 *size = gst_app_src_get_size (appsrc);
765 gst_app_src_query (GstBaseSrc * src, GstQuery * query)
767 GstAppSrc *appsrc = GST_APP_SRC_CAST (src);
768 GstAppSrcPrivate *priv = appsrc->priv;
771 switch (GST_QUERY_TYPE (query)) {
772 case GST_QUERY_LATENCY:
774 GstClockTime min, max;
777 /* Query the parent class for the defaults */
778 res = gst_base_src_query_latency (src, &live, &min, &max);
780 /* overwrite with our values when we need to */
781 g_mutex_lock (priv->mutex);
782 if (priv->min_latency != -1)
783 min = priv->min_latency;
784 if (priv->max_latency != -1)
785 max = priv->max_latency;
786 g_mutex_unlock (priv->mutex);
788 gst_query_set_latency (query, live, min, max);
791 case GST_QUERY_SCHEDULING:
793 gst_query_set_scheduling (query, GST_SCHEDULING_FLAG_SEEKABLE, 1, -1, 0);
794 gst_query_add_scheduling_mode (query, GST_PAD_MODE_PUSH);
796 switch (priv->stream_type) {
797 case GST_APP_STREAM_TYPE_STREAM:
798 case GST_APP_STREAM_TYPE_SEEKABLE:
800 case GST_APP_STREAM_TYPE_RANDOM_ACCESS:
801 gst_query_add_scheduling_mode (query, GST_PAD_MODE_PULL);
808 res = GST_BASE_SRC_CLASS (parent_class)->query (src, query);
815 /* will be called in push mode */
817 gst_app_src_do_seek (GstBaseSrc * src, GstSegment * segment)
819 GstAppSrc *appsrc = GST_APP_SRC_CAST (src);
820 GstAppSrcPrivate *priv = appsrc->priv;
821 gint64 desired_position;
822 gboolean res = FALSE;
824 desired_position = segment->position;
826 GST_DEBUG_OBJECT (appsrc, "seeking to %" G_GINT64_FORMAT ", format %s",
827 desired_position, gst_format_get_name (segment->format));
829 /* no need to try to seek in streaming mode */
830 if (priv->stream_type == GST_APP_STREAM_TYPE_STREAM)
833 if (priv->callbacks.seek_data)
834 res = priv->callbacks.seek_data (appsrc, desired_position, priv->user_data);
838 g_mutex_lock (priv->mutex);
839 emit = priv->emit_signals;
840 g_mutex_unlock (priv->mutex);
843 g_signal_emit (appsrc, gst_app_src_signals[SIGNAL_SEEK_DATA], 0,
844 desired_position, &res);
848 GST_DEBUG_OBJECT (appsrc, "flushing queue");
849 gst_app_src_flush_queued (appsrc);
850 priv->is_eos = FALSE;
852 GST_WARNING_OBJECT (appsrc, "seek failed");
858 /* must be called with the appsrc mutex */
860 gst_app_src_emit_seek (GstAppSrc * appsrc, guint64 offset)
862 gboolean res = FALSE;
864 GstAppSrcPrivate *priv = appsrc->priv;
866 emit = priv->emit_signals;
867 g_mutex_unlock (priv->mutex);
869 GST_DEBUG_OBJECT (appsrc,
870 "we are at %" G_GINT64_FORMAT ", seek to %" G_GINT64_FORMAT,
871 priv->offset, offset);
873 if (priv->callbacks.seek_data)
874 res = priv->callbacks.seek_data (appsrc, offset, priv->user_data);
876 g_signal_emit (appsrc, gst_app_src_signals[SIGNAL_SEEK_DATA], 0,
879 g_mutex_lock (priv->mutex);
884 /* must be called with the appsrc mutex. After this call things can be
887 gst_app_src_emit_need_data (GstAppSrc * appsrc, guint size)
890 GstAppSrcPrivate *priv = appsrc->priv;
892 emit = priv->emit_signals;
893 g_mutex_unlock (priv->mutex);
895 /* we have no data, we need some. We fire the signal with the size hint. */
896 if (priv->callbacks.need_data)
897 priv->callbacks.need_data (appsrc, size, priv->user_data);
899 g_signal_emit (appsrc, gst_app_src_signals[SIGNAL_NEED_DATA], 0, size,
902 g_mutex_lock (priv->mutex);
903 /* we can be flushing now because we released the lock */
907 gst_app_src_negotiate (GstBaseSrc * basesrc)
909 GstAppSrc *appsrc = GST_APP_SRC_CAST (basesrc);
910 GstAppSrcPrivate *priv = appsrc->priv;
914 GST_OBJECT_LOCK (appsrc);
915 if ((caps = priv->caps))
917 GST_OBJECT_UNLOCK (appsrc);
920 result = gst_base_src_set_caps (basesrc, caps);
921 gst_caps_unref (caps);
923 result = GST_BASE_SRC_CLASS (parent_class)->negotiate (basesrc);
929 gst_app_src_create (GstBaseSrc * bsrc, guint64 offset, guint size,
932 GstAppSrc *appsrc = GST_APP_SRC_CAST (bsrc);
933 GstAppSrcPrivate *priv = appsrc->priv;
936 GST_OBJECT_LOCK (appsrc);
937 if (G_UNLIKELY (priv->size != bsrc->segment.duration &&
938 bsrc->segment.format == GST_FORMAT_BYTES)) {
939 GST_DEBUG_OBJECT (appsrc,
940 "Size changed from %" G_GINT64_FORMAT " to %" G_GINT64_FORMAT,
941 bsrc->segment.duration, priv->size);
942 bsrc->segment.duration = priv->size;
943 GST_OBJECT_UNLOCK (appsrc);
945 gst_element_post_message (GST_ELEMENT (appsrc),
946 gst_message_new_duration (GST_OBJECT (appsrc), GST_FORMAT_BYTES,
949 GST_OBJECT_UNLOCK (appsrc);
952 g_mutex_lock (priv->mutex);
953 /* check flushing first */
954 if (G_UNLIKELY (priv->flushing))
957 if (priv->stream_type == GST_APP_STREAM_TYPE_RANDOM_ACCESS) {
958 /* if we are dealing with a random-access stream, issue a seek if the offset
960 if (G_UNLIKELY (priv->offset != offset)) {
964 res = gst_app_src_emit_seek (appsrc, offset);
966 if (G_UNLIKELY (!res))
967 /* failing to seek is fatal */
970 priv->offset = offset;
975 /* return data as long as we have some */
976 if (!g_queue_is_empty (priv->queue)) {
979 *buf = g_queue_pop_head (priv->queue);
980 buf_size = gst_buffer_get_size (*buf);
982 GST_DEBUG_OBJECT (appsrc, "we have buffer %p of size %u", *buf, buf_size);
984 priv->queued_bytes -= buf_size;
986 /* only update the offset when in random_access mode */
987 if (priv->stream_type == GST_APP_STREAM_TYPE_RANDOM_ACCESS)
988 priv->offset += buf_size;
990 /* signal that we removed an item */
991 g_cond_broadcast (priv->cond);
993 /* see if we go lower than the empty-percent */
994 if (priv->min_percent && priv->max_bytes) {
995 if (priv->queued_bytes * 100 / priv->max_bytes <= priv->min_percent)
996 /* ignore flushing state, we got a buffer and we will return it now.
997 * Errors will be handled in the next round */
998 gst_app_src_emit_need_data (appsrc, size);
1003 gst_app_src_emit_need_data (appsrc, size);
1005 /* we can be flushing now because we released the lock above */
1006 if (G_UNLIKELY (priv->flushing))
1009 /* if we have a buffer now, continue the loop and try to return it. In
1010 * random-access mode (where a buffer is normally pushed in the above
1011 * signal) we can still be empty because the pushed buffer got flushed or
1012 * when the application pushes the requested buffer later, we support both
1014 if (!g_queue_is_empty (priv->queue))
1017 /* no buffer yet, maybe we are EOS, if not, block for more data. */
1021 if (G_UNLIKELY (priv->is_eos))
1024 /* nothing to return, wait a while for new data or flushing. */
1025 g_cond_wait (priv->cond, priv->mutex);
1027 g_mutex_unlock (priv->mutex);
1033 GST_DEBUG_OBJECT (appsrc, "we are flushing");
1034 g_mutex_unlock (priv->mutex);
1035 return GST_FLOW_WRONG_STATE;
1039 GST_DEBUG_OBJECT (appsrc, "we are EOS");
1040 g_mutex_unlock (priv->mutex);
1041 return GST_FLOW_EOS;
1045 g_mutex_unlock (priv->mutex);
1046 GST_ELEMENT_ERROR (appsrc, RESOURCE, READ, ("failed to seek"),
1048 return GST_FLOW_ERROR;
1055 * gst_app_src_set_caps:
1056 * @appsrc: a #GstAppSrc
1057 * @caps: caps to set
1059 * Set the capabilities on the appsrc element. This function takes
1060 * a copy of the caps structure. After calling this method, the source will
1061 * only produce caps that match @caps. @caps must be fixed and the caps on the
1062 * buffers must match the caps or left NULL.
1067 gst_app_src_set_caps (GstAppSrc * appsrc, const GstCaps * caps)
1070 GstAppSrcPrivate *priv;
1072 g_return_if_fail (GST_IS_APP_SRC (appsrc));
1074 priv = appsrc->priv;
1076 GST_OBJECT_LOCK (appsrc);
1077 GST_DEBUG_OBJECT (appsrc, "setting caps to %" GST_PTR_FORMAT, caps);
1078 if ((old = priv->caps) != caps) {
1080 priv->caps = gst_caps_copy (caps);
1084 gst_caps_unref (old);
1086 GST_OBJECT_UNLOCK (appsrc);
1090 * gst_app_src_get_caps:
1091 * @appsrc: a #GstAppSrc
1093 * Get the configured caps on @appsrc.
1095 * Returns: the #GstCaps produced by the source. gst_caps_unref() after usage.
1100 gst_app_src_get_caps (GstAppSrc * appsrc)
1103 GstAppSrcPrivate *priv;
1105 g_return_val_if_fail (GST_IS_APP_SRC (appsrc), NULL);
1107 priv = appsrc->priv;
1109 GST_OBJECT_LOCK (appsrc);
1110 if ((caps = priv->caps))
1111 gst_caps_ref (caps);
1112 GST_DEBUG_OBJECT (appsrc, "getting caps of %" GST_PTR_FORMAT, caps);
1113 GST_OBJECT_UNLOCK (appsrc);
1119 * gst_app_src_set_size:
1120 * @appsrc: a #GstAppSrc
1121 * @size: the size to set
1123 * Set the size of the stream in bytes. A value of -1 means that the size is
1129 gst_app_src_set_size (GstAppSrc * appsrc, gint64 size)
1131 GstAppSrcPrivate *priv;
1133 g_return_if_fail (GST_IS_APP_SRC (appsrc));
1135 priv = appsrc->priv;
1137 GST_OBJECT_LOCK (appsrc);
1138 GST_DEBUG_OBJECT (appsrc, "setting size of %" G_GINT64_FORMAT, size);
1140 GST_OBJECT_UNLOCK (appsrc);
1144 * gst_app_src_get_size:
1145 * @appsrc: a #GstAppSrc
1147 * Get the size of the stream in bytes. A value of -1 means that the size is
1150 * Returns: the size of the stream previously set with gst_app_src_set_size();
1155 gst_app_src_get_size (GstAppSrc * appsrc)
1158 GstAppSrcPrivate *priv;
1160 g_return_val_if_fail (GST_IS_APP_SRC (appsrc), -1);
1162 priv = appsrc->priv;
1164 GST_OBJECT_LOCK (appsrc);
1166 GST_DEBUG_OBJECT (appsrc, "getting size of %" G_GINT64_FORMAT, size);
1167 GST_OBJECT_UNLOCK (appsrc);
1173 * gst_app_src_set_stream_type:
1174 * @appsrc: a #GstAppSrc
1175 * @type: the new state
1177 * Set the stream type on @appsrc. For seekable streams, the "seek" signal must
1180 * A stream_type stream
1185 gst_app_src_set_stream_type (GstAppSrc * appsrc, GstAppStreamType type)
1187 GstAppSrcPrivate *priv;
1189 g_return_if_fail (GST_IS_APP_SRC (appsrc));
1191 priv = appsrc->priv;
1193 GST_OBJECT_LOCK (appsrc);
1194 GST_DEBUG_OBJECT (appsrc, "setting stream_type of %d", type);
1195 priv->stream_type = type;
1196 GST_OBJECT_UNLOCK (appsrc);
1200 * gst_app_src_get_stream_type:
1201 * @appsrc: a #GstAppSrc
1203 * Get the stream type. Control the stream type of @appsrc
1204 * with gst_app_src_set_stream_type().
1206 * Returns: the stream type.
1211 gst_app_src_get_stream_type (GstAppSrc * appsrc)
1213 gboolean stream_type;
1214 GstAppSrcPrivate *priv;
1216 g_return_val_if_fail (GST_IS_APP_SRC (appsrc), FALSE);
1218 priv = appsrc->priv;
1220 GST_OBJECT_LOCK (appsrc);
1221 stream_type = priv->stream_type;
1222 GST_DEBUG_OBJECT (appsrc, "getting stream_type of %d", stream_type);
1223 GST_OBJECT_UNLOCK (appsrc);
1229 * gst_app_src_set_max_bytes:
1230 * @appsrc: a #GstAppSrc
1231 * @max: the maximum number of bytes to queue
1233 * Set the maximum amount of bytes that can be queued in @appsrc.
1234 * After the maximum amount of bytes are queued, @appsrc will emit the
1235 * "enough-data" signal.
1240 gst_app_src_set_max_bytes (GstAppSrc * appsrc, guint64 max)
1242 GstAppSrcPrivate *priv;
1244 g_return_if_fail (GST_IS_APP_SRC (appsrc));
1246 priv = appsrc->priv;
1248 g_mutex_lock (priv->mutex);
1249 if (max != priv->max_bytes) {
1250 GST_DEBUG_OBJECT (appsrc, "setting max-bytes to %" G_GUINT64_FORMAT, max);
1251 priv->max_bytes = max;
1252 /* signal the change */
1253 g_cond_broadcast (priv->cond);
1255 g_mutex_unlock (priv->mutex);
1259 * gst_app_src_get_max_bytes:
1260 * @appsrc: a #GstAppSrc
1262 * Get the maximum amount of bytes that can be queued in @appsrc.
1264 * Returns: The maximum amount of bytes that can be queued.
1269 gst_app_src_get_max_bytes (GstAppSrc * appsrc)
1272 GstAppSrcPrivate *priv;
1274 g_return_val_if_fail (GST_IS_APP_SRC (appsrc), 0);
1276 priv = appsrc->priv;
1278 g_mutex_lock (priv->mutex);
1279 result = priv->max_bytes;
1280 GST_DEBUG_OBJECT (appsrc, "getting max-bytes of %" G_GUINT64_FORMAT, result);
1281 g_mutex_unlock (priv->mutex);
1287 gst_app_src_set_latencies (GstAppSrc * appsrc, gboolean do_min, guint64 min,
1288 gboolean do_max, guint64 max)
1290 GstAppSrcPrivate *priv = appsrc->priv;
1291 gboolean changed = FALSE;
1293 g_mutex_lock (priv->mutex);
1294 if (do_min && priv->min_latency != min) {
1295 priv->min_latency = min;
1298 if (do_max && priv->max_latency != max) {
1299 priv->max_latency = max;
1302 g_mutex_unlock (priv->mutex);
1305 GST_DEBUG_OBJECT (appsrc, "posting latency changed");
1306 gst_element_post_message (GST_ELEMENT_CAST (appsrc),
1307 gst_message_new_latency (GST_OBJECT_CAST (appsrc)));
1312 * gst_app_src_set_latency:
1313 * @appsrc: a #GstAppSrc
1314 * @min: the min latency
1315 * @max: the min latency
1317 * Configure the @min and @max latency in @src. If @min is set to -1, the
1318 * default latency calculations for pseudo-live sources will be used.
1323 gst_app_src_set_latency (GstAppSrc * appsrc, guint64 min, guint64 max)
1325 gst_app_src_set_latencies (appsrc, TRUE, min, TRUE, max);
1329 * gst_app_src_get_latency:
1330 * @appsrc: a #GstAppSrc
1331 * @min: the min latency
1332 * @max: the min latency
1334 * Retrieve the min and max latencies in @min and @max respectively.
1339 gst_app_src_get_latency (GstAppSrc * appsrc, guint64 * min, guint64 * max)
1341 GstAppSrcPrivate *priv;
1343 g_return_if_fail (GST_IS_APP_SRC (appsrc));
1345 priv = appsrc->priv;
1347 g_mutex_lock (priv->mutex);
1349 *min = priv->min_latency;
1351 *max = priv->max_latency;
1352 g_mutex_unlock (priv->mutex);
1356 * gst_app_src_set_emit_signals:
1357 * @appsrc: a #GstAppSrc
1358 * @emit: the new state
1360 * Make appsrc emit the "new-preroll" and "new-buffer" signals. This option is
1361 * by default disabled because signal emission is expensive and unneeded when
1362 * the application prefers to operate in pull mode.
1367 gst_app_src_set_emit_signals (GstAppSrc * appsrc, gboolean emit)
1369 GstAppSrcPrivate *priv;
1371 g_return_if_fail (GST_IS_APP_SRC (appsrc));
1373 priv = appsrc->priv;
1375 g_mutex_lock (priv->mutex);
1376 priv->emit_signals = emit;
1377 g_mutex_unlock (priv->mutex);
1381 * gst_app_src_get_emit_signals:
1382 * @appsrc: a #GstAppSrc
1384 * Check if appsrc will emit the "new-preroll" and "new-buffer" signals.
1386 * Returns: %TRUE if @appsrc is emitting the "new-preroll" and "new-buffer"
1392 gst_app_src_get_emit_signals (GstAppSrc * appsrc)
1395 GstAppSrcPrivate *priv;
1397 g_return_val_if_fail (GST_IS_APP_SRC (appsrc), FALSE);
1399 priv = appsrc->priv;
1401 g_mutex_lock (priv->mutex);
1402 result = priv->emit_signals;
1403 g_mutex_unlock (priv->mutex);
1408 static GstFlowReturn
1409 gst_app_src_push_buffer_full (GstAppSrc * appsrc, GstBuffer * buffer,
1412 gboolean first = TRUE;
1413 GstAppSrcPrivate *priv;
1415 g_return_val_if_fail (GST_IS_APP_SRC (appsrc), GST_FLOW_ERROR);
1416 g_return_val_if_fail (GST_IS_BUFFER (buffer), GST_FLOW_ERROR);
1418 priv = appsrc->priv;
1420 g_mutex_lock (priv->mutex);
1423 /* can't accept buffers when we are flushing or EOS */
1430 if (priv->max_bytes && priv->queued_bytes >= priv->max_bytes) {
1431 GST_DEBUG_OBJECT (appsrc,
1432 "queue filled (%" G_GUINT64_FORMAT " >= %" G_GUINT64_FORMAT ")",
1433 priv->queued_bytes, priv->max_bytes);
1438 emit = priv->emit_signals;
1439 /* only signal on the first push */
1440 g_mutex_unlock (priv->mutex);
1442 if (priv->callbacks.enough_data)
1443 priv->callbacks.enough_data (appsrc, priv->user_data);
1445 g_signal_emit (appsrc, gst_app_src_signals[SIGNAL_ENOUGH_DATA], 0,
1448 g_mutex_lock (priv->mutex);
1449 /* continue to check for flushing/eos after releasing the lock */
1454 GST_DEBUG_OBJECT (appsrc, "waiting for free space");
1455 /* we are filled, wait until a buffer gets popped or when we
1457 g_cond_wait (priv->cond, priv->mutex);
1459 /* no need to wait for free space, we just pump more data into the
1460 * queue hoping that the caller reacts to the enough-data signal and
1461 * stops pushing buffers. */
1468 GST_DEBUG_OBJECT (appsrc, "queueing buffer %p", buffer);
1470 gst_buffer_ref (buffer);
1471 g_queue_push_tail (priv->queue, buffer);
1472 priv->queued_bytes += gst_buffer_get_size (buffer);
1473 g_cond_broadcast (priv->cond);
1474 g_mutex_unlock (priv->mutex);
1481 GST_DEBUG_OBJECT (appsrc, "refuse buffer %p, we are flushing", buffer);
1483 gst_buffer_unref (buffer);
1484 g_mutex_unlock (priv->mutex);
1485 return GST_FLOW_WRONG_STATE;
1489 GST_DEBUG_OBJECT (appsrc, "refuse buffer %p, we are EOS", buffer);
1491 gst_buffer_unref (buffer);
1492 g_mutex_unlock (priv->mutex);
1493 return GST_FLOW_EOS;
1498 * gst_app_src_push_buffer:
1499 * @appsrc: a #GstAppSrc
1500 * @buffer: a #GstBuffer to push
1502 * Adds a buffer to the queue of buffers that the appsrc element will
1503 * push to its source pad. This function takes ownership of the buffer.
1505 * When the block property is TRUE, this function can block until free
1506 * space becomes available in the queue.
1508 * Returns: #GST_FLOW_OK when the buffer was successfuly queued.
1509 * #GST_FLOW_WRONG_STATE when @appsrc is not PAUSED or PLAYING.
1510 * #GST_FLOW_EOS when EOS occured.
1515 gst_app_src_push_buffer (GstAppSrc * appsrc, GstBuffer * buffer)
1517 return gst_app_src_push_buffer_full (appsrc, buffer, TRUE);
1520 /* push a buffer without stealing the ref of the buffer. This is used for the
1522 static GstFlowReturn
1523 gst_app_src_push_buffer_action (GstAppSrc * appsrc, GstBuffer * buffer)
1525 return gst_app_src_push_buffer_full (appsrc, buffer, FALSE);
1529 * gst_app_src_end_of_stream:
1530 * @appsrc: a #GstAppSrc
1532 * Indicates to the appsrc element that the last buffer queued in the
1533 * element is the last buffer of the stream.
1535 * Returns: #GST_FLOW_OK when the EOS was successfuly queued.
1536 * #GST_FLOW_WRONG_STATE when @appsrc is not PAUSED or PLAYING.
1541 gst_app_src_end_of_stream (GstAppSrc * appsrc)
1543 GstAppSrcPrivate *priv;
1545 g_return_val_if_fail (GST_IS_APP_SRC (appsrc), GST_FLOW_ERROR);
1547 priv = appsrc->priv;
1549 g_mutex_lock (priv->mutex);
1550 /* can't accept buffers when we are flushing. We can accept them when we are
1551 * EOS although it will not do anything. */
1555 GST_DEBUG_OBJECT (appsrc, "sending EOS");
1556 priv->is_eos = TRUE;
1557 g_cond_broadcast (priv->cond);
1558 g_mutex_unlock (priv->mutex);
1565 g_mutex_unlock (priv->mutex);
1566 GST_DEBUG_OBJECT (appsrc, "refuse EOS, we are flushing");
1567 return GST_FLOW_WRONG_STATE;
1572 * gst_app_src_set_callbacks:
1573 * @appsrc: a #GstAppSrc
1574 * @callbacks: the callbacks
1575 * @user_data: a user_data argument for the callbacks
1576 * @notify: a destroy notify function
1578 * Set callbacks which will be executed when data is needed, enough data has
1579 * been collected or when a seek should be performed.
1580 * This is an alternative to using the signals, it has lower overhead and is thus
1581 * less expensive, but also less flexible.
1583 * If callbacks are installed, no signals will be emitted for performance
1589 gst_app_src_set_callbacks (GstAppSrc * appsrc,
1590 GstAppSrcCallbacks * callbacks, gpointer user_data, GDestroyNotify notify)
1592 GDestroyNotify old_notify;
1593 GstAppSrcPrivate *priv;
1595 g_return_if_fail (GST_IS_APP_SRC (appsrc));
1596 g_return_if_fail (callbacks != NULL);
1598 priv = appsrc->priv;
1600 GST_OBJECT_LOCK (appsrc);
1601 old_notify = priv->notify;
1606 old_data = priv->user_data;
1608 priv->user_data = NULL;
1609 priv->notify = NULL;
1610 GST_OBJECT_UNLOCK (appsrc);
1612 old_notify (old_data);
1614 GST_OBJECT_LOCK (appsrc);
1616 priv->callbacks = *callbacks;
1617 priv->user_data = user_data;
1618 priv->notify = notify;
1619 GST_OBJECT_UNLOCK (appsrc);
1622 /*** GSTURIHANDLER INTERFACE *************************************************/
1625 gst_app_src_uri_get_type (GType type)
1630 static const gchar *const *
1631 gst_app_src_uri_get_protocols (GType type)
1633 static const gchar *protocols[] = { "appsrc", NULL };
1639 gst_app_src_uri_get_uri (GstURIHandler * handler)
1641 return g_strdup ("appsrc");
1645 gst_app_src_uri_set_uri (GstURIHandler * handler, const gchar * uri,
1648 /* GstURIHandler checks the protocol for us */
1653 gst_app_src_uri_handler_init (gpointer g_iface, gpointer iface_data)
1655 GstURIHandlerInterface *iface = (GstURIHandlerInterface *) g_iface;
1657 iface->get_type = gst_app_src_uri_get_type;
1658 iface->get_protocols = gst_app_src_uri_get_protocols;
1659 iface->get_uri = gst_app_src_uri_get_uri;
1660 iface->set_uri = gst_app_src_uri_set_uri;