2 * Copyright (C) 2003 Benjamin Otte <in7y118@public.uni-hamburg.de>
4 * gsttypefindelement.c: element that detects type of stream
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Library General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Library General Public License for more details.
16 * You should have received a copy of the GNU Library General Public
17 * License along with this library; if not, write to the
18 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
19 * Boston, MA 02110-1301, USA.
22 * SECTION:element-typefind
25 * Determines the media-type of a stream. It applies typefind functions in the
26 * order of their rank. Once the type has been detected it sets its src pad caps
27 * to the found media type.
29 * Whenever a type is found the #GstTypeFindElement::have-type signal is
30 * emitted, either from the streaming thread or the application thread
31 * (the latter may happen when typefinding is done pull-based from the
32 * state change function).
34 * Plugins can register custom typefinders by using #GstTypeFindFactory.
37 /* FIXME: need a better solution for non-seekable streams */
40 * 1) get a list of all typefind functions sorted best to worst
41 * 2) if all elements have been called with all requested data goto 8
42 * 3) call all functions once with all available data
43 * 4) if a function returns a value >= PROP_MAXIMUM goto 8 (never implemented))
44 * 5) all functions with a result > PROP_MINIMUM or functions that did not get
45 * all requested data (where peek returned NULL) stay in list
46 * 6) seek to requested offset of best function that still has open data
49 * 8) take best available result and use its caps
51 * The element has two scheduling modes:
53 * 1) chain based, it will collect buffers and run the typefind function on
54 * the buffer until something is found.
55 * 2) getrange based, it will proxy the getrange function to the sinkpad. It
56 * is assumed that the peer element is happy with whatever format we
59 * By default it tries to do pull based typefinding (this avoids joining
60 * received buffers and holding them back in store.)
62 * When the element has no connected srcpad, and the sinkpad can operate in
63 * getrange based mode, the element starts its own task to figure out the
66 * Most of the actual implementation is in libs/gst/base/gsttypefindhelper.c.
73 #include "gst/gst_private.h"
75 #include "gsttypefindelement.h"
76 #include "gstcoreelementselements.h"
77 #include "gst/gst-i18n-lib.h"
78 #include "gst/base/gsttypefindhelper.h"
80 #include <gst/gsttypefind.h>
81 #include <gst/gstutils.h>
82 #include <gst/gsterror.h>
84 GST_DEBUG_CATEGORY_STATIC (gst_type_find_element_debug);
85 #define GST_CAT_DEFAULT gst_type_find_element_debug
87 /* generic templates */
88 static GstStaticPadTemplate type_find_element_sink_template =
89 GST_STATIC_PAD_TEMPLATE ("sink",
94 static GstStaticPadTemplate type_find_element_src_template =
95 GST_STATIC_PAD_TEMPLATE ("src",
100 /* Require at least 2kB of data before we attempt typefinding in chain-mode.
101 * 128kB is massive overkill for the maximum, but doesn't do any harm */
102 #ifdef TIZEN_PROFILE_TV
103 /* TV demuxer needs 4*1024 as min size to match demuxer, if not
104 * sometimes can't find correct demuxer
106 #define TYPE_FIND_MIN_SIZE (4*1024)
108 #define TYPE_FIND_MIN_SIZE (2*1024)
110 #define TYPE_FIND_MAX_SIZE (128*1024)
112 /* TypeFind signals and args */
128 MODE_NORMAL, /* act as identity */
129 MODE_TYPEFIND, /* do typefinding */
130 MODE_ERROR /* had fatal error */
135 GST_DEBUG_CATEGORY_INIT (gst_type_find_element_debug, "typefind", \
136 GST_DEBUG_BG_YELLOW | GST_DEBUG_FG_GREEN, "type finding element");
137 #define gst_type_find_element_parent_class parent_class
138 G_DEFINE_TYPE_WITH_CODE (GstTypeFindElement, gst_type_find_element,
139 GST_TYPE_ELEMENT, _do_init);
140 GST_ELEMENT_REGISTER_DEFINE (typefind, "typefind", GST_RANK_NONE,
141 GST_TYPE_TYPE_FIND_ELEMENT);
143 static void gst_type_find_element_dispose (GObject * object);
144 static void gst_type_find_element_set_property (GObject * object,
145 guint prop_id, const GValue * value, GParamSpec * pspec);
146 static void gst_type_find_element_get_property (GObject * object,
147 guint prop_id, GValue * value, GParamSpec * pspec);
149 static gboolean gst_type_find_element_src_event (GstPad * pad,
150 GstObject * parent, GstEvent * event);
151 static gboolean gst_type_find_handle_src_query (GstPad * pad,
152 GstObject * parent, GstQuery * query);
154 static gboolean gst_type_find_element_sink_event (GstPad * pad,
155 GstObject * parent, GstEvent * event);
156 static gboolean gst_type_find_element_setcaps (GstTypeFindElement * typefind,
158 static GstFlowReturn gst_type_find_element_chain (GstPad * sinkpad,
159 GstObject * parent, GstBuffer * buffer);
160 static GstFlowReturn gst_type_find_element_getrange (GstPad * srcpad,
161 GstObject * parent, guint64 offset, guint length, GstBuffer ** buffer);
163 static GstStateChangeReturn
164 gst_type_find_element_change_state (GstElement * element,
165 GstStateChange transition);
166 static gboolean gst_type_find_element_activate_sink (GstPad * pad,
168 static gboolean gst_type_find_element_activate_sink_mode (GstPad * pad,
169 GstObject * parent, GstPadMode mode, gboolean active);
170 static gboolean gst_type_find_element_activate_src_mode (GstPad * pad,
171 GstObject * parent, GstPadMode mode, gboolean active);
173 gst_type_find_element_chain_do_typefinding (GstTypeFindElement * typefind,
174 gboolean check_avail, gboolean at_eos);
175 static void gst_type_find_element_send_cached_events (GstTypeFindElement *
178 static void gst_type_find_element_loop (GstPad * pad);
180 static guint gst_type_find_element_signals[LAST_SIGNAL] = { 0 };
183 gst_type_find_element_have_type (GstTypeFindElement * typefind,
184 guint probability, GstCaps * caps)
188 g_assert (caps != NULL);
190 GST_INFO_OBJECT (typefind, "found caps %" GST_PTR_FORMAT ", probability=%u",
193 /* Do nothing if downstream is pulling from us */
194 if (GST_PAD_MODE (typefind->src) == GST_PAD_MODE_PULL)
197 GST_OBJECT_LOCK (typefind);
199 /* Now actually send the CAPS event downstream.
201 * Try to directly send the CAPS event downstream that we created in
202 * gst_type_find_element_emit_have_type() if it is still there, instead
203 * of creating a new one. No need to create an equivalent one, replacing
204 * it in the sticky event list and possibly causing renegotiation
206 event = gst_pad_get_sticky_event (typefind->src, GST_EVENT_CAPS, 0);
210 gst_event_parse_caps (event, &event_caps);
211 if (caps != event_caps) {
212 gst_event_unref (event);
213 event = gst_event_new_caps (caps);
216 event = gst_event_new_caps (caps);
219 GST_OBJECT_UNLOCK (typefind);
221 gst_pad_push_event (typefind->src, event);
225 gst_type_find_element_emit_have_type (GstTypeFindElement * typefind,
226 guint probability, GstCaps * caps)
230 /* Update caps field immediately so that caps queries and properties can be
231 * honored in all "have-type" signal handlers.
233 GST_OBJECT_LOCK (typefind);
234 gst_caps_replace (&typefind->caps, caps);
235 GST_OBJECT_UNLOCK (typefind);
237 /* Only store the caps event at this point. We give signal handlers
238 * the chance to look at the caps before they are sent downstream.
239 * They are only forwarded downstream later in the default signal
240 * handler after all application signal handlers
242 event = gst_event_new_caps (caps);
243 gst_pad_store_sticky_event (typefind->src, event);
244 gst_event_unref (event);
246 g_signal_emit (typefind, gst_type_find_element_signals[HAVE_TYPE], 0,
251 gst_type_find_element_class_init (GstTypeFindElementClass * typefind_class)
253 GObjectClass *gobject_class = G_OBJECT_CLASS (typefind_class);
254 GstElementClass *gstelement_class = GST_ELEMENT_CLASS (typefind_class);
256 gobject_class->set_property = gst_type_find_element_set_property;
257 gobject_class->get_property = gst_type_find_element_get_property;
258 gobject_class->dispose = gst_type_find_element_dispose;
260 g_object_class_install_property (gobject_class, PROP_CAPS,
261 g_param_spec_boxed ("caps", _("caps"),
262 _("detected capabilities in stream"), GST_TYPE_CAPS,
263 G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
264 g_object_class_install_property (gobject_class, PROP_MINIMUM,
265 g_param_spec_uint ("minimum", _("minimum"),
266 "minimum probability required to accept caps", GST_TYPE_FIND_MINIMUM,
267 GST_TYPE_FIND_MAXIMUM, GST_TYPE_FIND_MINIMUM,
268 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
269 g_object_class_install_property (gobject_class, PROP_FORCE_CAPS,
270 g_param_spec_boxed ("force-caps", _("force caps"),
271 _("force caps without doing a typefind"), GST_TYPE_CAPS,
272 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
274 * GstTypeFindElement::have-type:
275 * @typefind: the typefind instance
276 * @probability: the probability of the type found
277 * @caps: the caps of the type found
279 * This signal gets emitted when the type and its probability has
282 gst_type_find_element_signals[HAVE_TYPE] = g_signal_new ("have-type",
283 G_TYPE_FROM_CLASS (typefind_class), G_SIGNAL_RUN_LAST,
284 G_STRUCT_OFFSET (GstTypeFindElementClass, have_type), NULL, NULL,
285 NULL, G_TYPE_NONE, 2,
286 G_TYPE_UINT, GST_TYPE_CAPS | G_SIGNAL_TYPE_STATIC_SCOPE);
288 typefind_class->have_type =
289 GST_DEBUG_FUNCPTR (gst_type_find_element_have_type);
291 gst_element_class_set_static_metadata (gstelement_class,
294 "Finds the media type of a stream",
295 "Benjamin Otte <in7y118@public.uni-hamburg.de>");
296 gst_element_class_add_static_pad_template (gstelement_class,
297 &type_find_element_src_template);
298 gst_element_class_add_static_pad_template (gstelement_class,
299 &type_find_element_sink_template);
301 gstelement_class->change_state =
302 GST_DEBUG_FUNCPTR (gst_type_find_element_change_state);
306 gst_type_find_element_init (GstTypeFindElement * typefind)
310 gst_pad_new_from_static_template (&type_find_element_sink_template,
313 gst_pad_set_activate_function (typefind->sink,
314 GST_DEBUG_FUNCPTR (gst_type_find_element_activate_sink));
315 gst_pad_set_activatemode_function (typefind->sink,
316 GST_DEBUG_FUNCPTR (gst_type_find_element_activate_sink_mode));
317 gst_pad_set_chain_function (typefind->sink,
318 GST_DEBUG_FUNCPTR (gst_type_find_element_chain));
319 gst_pad_set_event_function (typefind->sink,
320 GST_DEBUG_FUNCPTR (gst_type_find_element_sink_event));
321 GST_PAD_SET_PROXY_ALLOCATION (typefind->sink);
322 gst_element_add_pad (GST_ELEMENT (typefind), typefind->sink);
326 gst_pad_new_from_static_template (&type_find_element_src_template, "src");
328 gst_pad_set_activatemode_function (typefind->src,
329 GST_DEBUG_FUNCPTR (gst_type_find_element_activate_src_mode));
330 gst_pad_set_getrange_function (typefind->src,
331 GST_DEBUG_FUNCPTR (gst_type_find_element_getrange));
332 gst_pad_set_event_function (typefind->src,
333 GST_DEBUG_FUNCPTR (gst_type_find_element_src_event));
334 gst_pad_set_query_function (typefind->src,
335 GST_DEBUG_FUNCPTR (gst_type_find_handle_src_query));
336 gst_pad_use_fixed_caps (typefind->src);
337 gst_element_add_pad (GST_ELEMENT (typefind), typefind->src);
339 typefind->mode = MODE_TYPEFIND;
340 typefind->caps = NULL;
341 typefind->min_probability = 1;
343 typefind->adapter = gst_adapter_new ();
347 gst_type_find_element_dispose (GObject * object)
349 GstTypeFindElement *typefind = GST_TYPE_FIND_ELEMENT (object);
351 gst_clear_object (&typefind->adapter);
352 gst_clear_caps (&typefind->force_caps);
354 G_OBJECT_CLASS (parent_class)->dispose (object);
358 gst_type_find_element_set_property (GObject * object, guint prop_id,
359 const GValue * value, GParamSpec * pspec)
361 GstTypeFindElement *typefind;
363 typefind = GST_TYPE_FIND_ELEMENT (object);
367 typefind->min_probability = g_value_get_uint (value);
369 case PROP_FORCE_CAPS:
370 GST_OBJECT_LOCK (typefind);
371 gst_caps_take (&typefind->force_caps, g_value_dup_boxed (value));
372 GST_OBJECT_UNLOCK (typefind);
375 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
381 gst_type_find_element_get_property (GObject * object, guint prop_id,
382 GValue * value, GParamSpec * pspec)
384 GstTypeFindElement *typefind;
386 typefind = GST_TYPE_FIND_ELEMENT (object);
390 GST_OBJECT_LOCK (typefind);
391 g_value_set_boxed (value, typefind->caps);
392 GST_OBJECT_UNLOCK (typefind);
395 g_value_set_uint (value, typefind->min_probability);
397 case PROP_FORCE_CAPS:
398 GST_OBJECT_LOCK (typefind);
399 g_value_set_boxed (value, typefind->force_caps);
400 GST_OBJECT_UNLOCK (typefind);
403 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
409 gst_type_find_handle_src_query (GstPad * pad, GstObject * parent,
412 GstTypeFindElement *typefind;
413 gboolean res = FALSE;
415 typefind = GST_TYPE_FIND_ELEMENT (parent);
416 GST_DEBUG_OBJECT (typefind, "Handling src query %s",
417 GST_QUERY_TYPE_NAME (query));
419 switch (GST_QUERY_TYPE (query)) {
420 case GST_QUERY_SCHEDULING:
421 /* FIXME, filter out the scheduling modes that we understand */
422 res = gst_pad_peer_query (typefind->sink, query);
426 GST_DEBUG_OBJECT (typefind,
427 "Got caps query, our caps are %" GST_PTR_FORMAT, typefind->caps);
429 /* We can hijack caps query if we typefind already */
430 if (typefind->caps) {
431 gst_query_set_caps_result (query, typefind->caps);
434 res = gst_pad_peer_query (typefind->sink, query);
438 case GST_QUERY_POSITION:
443 if (!(res = gst_pad_peer_query (typefind->sink, query)))
446 gst_query_parse_position (query, &format, &peer_pos);
448 GST_OBJECT_LOCK (typefind);
449 /* FIXME: this code assumes that there's no discont in the queue */
451 case GST_FORMAT_BYTES:
452 peer_pos -= gst_adapter_available (typefind->adapter);
453 if (peer_pos < 0) /* Clamp result to 0 */
460 GST_OBJECT_UNLOCK (typefind);
461 gst_query_set_position (query, format, peer_pos);
465 res = gst_pad_query_default (pad, parent, query);
473 gst_type_find_element_seek (GstTypeFindElement * typefind, GstEvent * event)
476 GstSeekType start_type, stop_type;
481 GstSegment seeksegment = { 0, };
483 gst_event_parse_seek (event, &rate, &format, &flags, &start_type, &start,
486 /* we can only seek on bytes */
487 if (format != GST_FORMAT_BYTES) {
488 GST_DEBUG_OBJECT (typefind, "Can only seek on BYTES");
492 /* copy segment, we need this because we still need the old
493 * segment when we close the current segment. */
494 memcpy (&seeksegment, &typefind->segment, sizeof (GstSegment));
496 GST_DEBUG_OBJECT (typefind, "configuring seek");
497 gst_segment_do_seek (&seeksegment, rate, format, flags,
498 start_type, start, stop_type, stop, NULL);
500 flush = ! !(flags & GST_SEEK_FLAG_FLUSH);
502 GST_DEBUG_OBJECT (typefind, "New segment %" GST_SEGMENT_FORMAT, &seeksegment);
505 GST_DEBUG_OBJECT (typefind, "Starting flush");
506 gst_pad_push_event (typefind->sink, gst_event_new_flush_start ());
507 gst_pad_push_event (typefind->src, gst_event_new_flush_start ());
509 GST_DEBUG_OBJECT (typefind, "Non-flushing seek, pausing task");
510 gst_pad_pause_task (typefind->sink);
513 /* now grab the stream lock so that streaming cannot continue, for
514 * non flushing seeks when the element is in PAUSED this could block
516 GST_DEBUG_OBJECT (typefind, "Waiting for streaming to stop");
517 GST_PAD_STREAM_LOCK (typefind->sink);
520 GST_DEBUG_OBJECT (typefind, "Stopping flush");
521 gst_pad_push_event (typefind->sink, gst_event_new_flush_stop (TRUE));
522 gst_pad_push_event (typefind->src, gst_event_new_flush_stop (TRUE));
525 /* now update the real segment info */
526 GST_DEBUG_OBJECT (typefind, "Committing new seek segment");
527 memcpy (&typefind->segment, &seeksegment, sizeof (GstSegment));
528 typefind->offset = typefind->segment.start;
530 /* notify start of new segment */
531 if (typefind->segment.flags & GST_SEGMENT_FLAG_SEGMENT) {
534 msg = gst_message_new_segment_start (GST_OBJECT (typefind),
535 GST_FORMAT_BYTES, typefind->segment.start);
536 gst_element_post_message (GST_ELEMENT (typefind), msg);
539 typefind->need_segment = TRUE;
540 typefind->seqnum = gst_event_get_seqnum (event);
542 /* restart our task since it might have been stopped when we did the
544 gst_pad_start_task (typefind->sink,
545 (GstTaskFunction) gst_type_find_element_loop, typefind->sink, NULL);
547 /* streaming can continue now */
548 GST_PAD_STREAM_UNLOCK (typefind->sink);
554 gst_type_find_element_src_event (GstPad * pad, GstObject * parent,
557 GstTypeFindElement *typefind = GST_TYPE_FIND_ELEMENT (parent);
560 /* Always forward RECONFIGURE events upstream */
561 if (GST_EVENT_TYPE (event) == GST_EVENT_RECONFIGURE) {
562 return gst_pad_push_event (typefind->sink, event);
565 if (typefind->mode != MODE_NORMAL) {
566 /* need to do more? */
567 GST_LOG_OBJECT (typefind, "Still typefinding. Not passing event upstream");
568 gst_event_unref (event);
572 /* Only handle seeks here if driving the pipeline */
573 if (typefind->segment.format != GST_FORMAT_UNDEFINED &&
574 GST_EVENT_TYPE (event) == GST_EVENT_SEEK) {
575 result = gst_type_find_element_seek (typefind, event);
576 gst_event_unref (event);
579 return gst_pad_push_event (typefind->sink, event);
584 start_typefinding (GstTypeFindElement * typefind)
586 GST_DEBUG_OBJECT (typefind, "starting typefinding");
588 GST_OBJECT_LOCK (typefind);
590 gst_caps_replace (&typefind->caps, NULL);
591 typefind->initial_offset = GST_BUFFER_OFFSET_NONE;
592 GST_OBJECT_UNLOCK (typefind);
594 typefind->mode = MODE_TYPEFIND;
598 stop_typefinding (GstTypeFindElement * typefind)
601 gboolean push_cached_buffers;
604 GstClockTime pts, dts;
606 gst_element_get_state (GST_ELEMENT (typefind), &state, NULL, 0);
608 push_cached_buffers = (state >= GST_STATE_PAUSED && typefind->caps);
610 GST_DEBUG_OBJECT (typefind, "stopping typefinding%s",
611 push_cached_buffers ? " and pushing cached events and buffers" : "");
613 typefind->mode = MODE_NORMAL;
614 if (push_cached_buffers)
615 gst_type_find_element_send_cached_events (typefind);
617 GST_OBJECT_LOCK (typefind);
618 avail = gst_adapter_available (typefind->adapter);
622 pts = gst_adapter_prev_pts (typefind->adapter, NULL);
623 dts = gst_adapter_prev_dts (typefind->adapter, NULL);
624 buffer = gst_adapter_take_buffer (typefind->adapter, avail);
625 GST_BUFFER_PTS (buffer) = pts;
626 GST_BUFFER_DTS (buffer) = dts;
627 GST_BUFFER_OFFSET (buffer) = typefind->initial_offset;
628 GST_OBJECT_UNLOCK (typefind);
630 if (!push_cached_buffers) {
631 gst_buffer_unref (buffer);
633 GstPad *peer = gst_pad_get_peer (typefind->src);
635 /* make sure the user gets a meaningful error message in this case,
636 * which is not a core bug or bug of any kind (as the default error
637 * message emitted by gstpad.c otherwise would make you think) */
638 if (peer && GST_PAD_CHAINFUNC (peer) == NULL) {
639 GST_DEBUG_OBJECT (typefind, "upstream only supports push mode, while "
640 "downstream element only works in pull mode, erroring out");
641 GST_ELEMENT_ERROR (typefind, STREAM, FAILED,
642 ("%s cannot work in push mode. The operation is not supported "
643 "with this source element or protocol.",
644 G_OBJECT_TYPE_NAME (GST_PAD_PARENT (peer))),
645 ("Downstream pad %s:%s has no chainfunction, and the upstream "
646 "element does not support pull mode", GST_DEBUG_PAD_NAME (peer)));
647 typefind->mode = MODE_ERROR; /* make the chain function error out */
648 gst_buffer_unref (buffer);
650 gst_pad_push (typefind->src, buffer);
653 gst_object_unref (peer);
660 GST_DEBUG_OBJECT (typefind, "we have no data to typefind");
661 GST_OBJECT_UNLOCK (typefind);
667 gst_type_find_element_sink_event (GstPad * pad, GstObject * parent,
670 gboolean res = FALSE;
671 GstTypeFindElement *typefind = GST_TYPE_FIND_ELEMENT (parent);
673 GST_DEBUG_OBJECT (typefind, "got %s event in mode %d",
674 GST_EVENT_TYPE_NAME (event), typefind->mode);
676 switch (typefind->mode) {
678 switch (GST_EVENT_TYPE (event)) {
683 /* Parse and push out our caps and data */
684 gst_event_parse_caps (event, &caps);
685 res = gst_type_find_element_setcaps (typefind, caps);
687 gst_event_unref (event);
692 GST_FIXME_OBJECT (typefind,
693 "GAP events during typefinding not handled properly");
695 /* FIXME: These would need to be inserted in the stream at
696 * the right position between buffers, but we combine all
697 * buffers with a GstAdapter. Drop the GAP event for now,
698 * which will only cause an implicit GAP between buffers.
700 gst_event_unref (event);
706 GST_INFO_OBJECT (typefind, "Got EOS and no type found yet");
707 gst_type_find_element_chain_do_typefinding (typefind, FALSE, TRUE);
709 res = gst_pad_push_event (typefind->src, event);
712 case GST_EVENT_FLUSH_STOP:{
715 GST_OBJECT_LOCK (typefind);
717 for (l = typefind->cached_events; l; l = l->next) {
718 if (GST_EVENT_IS_STICKY (l->data) &&
719 GST_EVENT_TYPE (l->data) != GST_EVENT_SEGMENT &&
720 GST_EVENT_TYPE (l->data) != GST_EVENT_EOS) {
721 gst_pad_store_sticky_event (typefind->src, l->data);
723 gst_event_unref (l->data);
726 g_list_free (typefind->cached_events);
727 typefind->cached_events = NULL;
728 gst_adapter_clear (typefind->adapter);
729 GST_OBJECT_UNLOCK (typefind);
732 case GST_EVENT_FLUSH_START:
733 res = gst_pad_push_event (typefind->src, event);
736 /* Forward events that would happen before the caps event
737 * directly instead of storing them. There's no reason not
738 * to send them directly and we should only store events
739 * for later sending that would need to come after the caps
741 if (GST_EVENT_TYPE (event) < GST_EVENT_CAPS) {
742 res = gst_pad_push_event (typefind->src, event);
744 GST_DEBUG_OBJECT (typefind, "Saving %s event to send later",
745 GST_EVENT_TYPE_NAME (event));
746 GST_OBJECT_LOCK (typefind);
747 typefind->cached_events =
748 g_list_append (typefind->cached_events, event);
749 GST_OBJECT_UNLOCK (typefind);
756 res = gst_pad_push_event (typefind->src, event);
761 g_assert_not_reached ();
767 gst_type_find_element_send_cached_events (GstTypeFindElement * typefind)
769 GList *l, *cached_events;
771 GST_OBJECT_LOCK (typefind);
772 cached_events = typefind->cached_events;
773 typefind->cached_events = NULL;
774 GST_OBJECT_UNLOCK (typefind);
776 for (l = cached_events; l != NULL; l = l->next) {
777 GstEvent *event = GST_EVENT (l->data);
779 GST_DEBUG_OBJECT (typefind, "sending cached %s event",
780 GST_EVENT_TYPE_NAME (event));
781 gst_pad_push_event (typefind->src, event);
783 g_list_free (cached_events);
787 gst_type_find_element_setcaps (GstTypeFindElement * typefind, GstCaps * caps)
789 /* don't operate on ANY caps */
790 if (gst_caps_is_any (caps))
793 /* Set to MODE_NORMAL before emitting have-type, in case it triggers a seek */
794 typefind->mode = MODE_NORMAL;
795 gst_type_find_element_emit_have_type (typefind, GST_TYPE_FIND_MAXIMUM, caps);
797 /* Shortcircuit typefinding if we get caps */
798 GST_DEBUG_OBJECT (typefind, "Skipping typefinding, using caps from "
799 "upstream: %" GST_PTR_FORMAT, caps);
801 stop_typefinding (typefind);
807 gst_type_find_get_extension (GstTypeFindElement * typefind, GstPad * pad)
814 query = gst_query_new_uri ();
816 /* try getting the caps with an uri query and from the extension */
817 if (!gst_pad_peer_query (pad, query))
818 goto peer_query_failed;
820 gst_query_parse_uri (query, &uri);
824 GST_DEBUG_OBJECT (typefind, "finding extension of %s", uri);
826 /* find the extension on the uri, this is everything after a '.' */
831 if (uri[find] == '.')
838 result = g_strdup (&uri[find + 1]);
840 GST_DEBUG_OBJECT (typefind, "found extension %s", result);
841 gst_query_unref (query);
849 GST_INFO_OBJECT (typefind, "failed to query peer uri");
850 gst_query_unref (query);
855 GST_INFO_OBJECT (typefind, "could not parse the peer uri");
856 gst_query_unref (query);
861 GST_INFO_OBJECT (typefind, "could not find uri extension in %s", uri);
862 gst_query_unref (query);
869 gst_type_find_guess_by_extension (GstTypeFindElement * typefind, GstPad * pad,
870 GstTypeFindProbability * probability)
875 ext = gst_type_find_get_extension (typefind, pad);
879 caps = gst_type_find_helper_for_extension (GST_OBJECT_CAST (typefind), ext);
881 *probability = GST_TYPE_FIND_MAXIMUM;
889 gst_type_find_element_chain (GstPad * pad, GstObject * parent,
892 GstTypeFindElement *typefind;
893 GstFlowReturn res = GST_FLOW_OK;
895 typefind = GST_TYPE_FIND_ELEMENT (parent);
897 GST_LOG_OBJECT (typefind, "handling buffer in mode %d", typefind->mode);
899 switch (typefind->mode) {
901 /* we should already have called GST_ELEMENT_ERROR */
902 return GST_FLOW_ERROR;
904 /* don't take object lock as typefind->caps should not change anymore */
905 return gst_pad_push (typefind->src, buffer);
908 GST_OBJECT_LOCK (typefind);
909 if (typefind->initial_offset == GST_BUFFER_OFFSET_NONE)
910 typefind->initial_offset = GST_BUFFER_OFFSET (buffer);
911 gst_adapter_push (typefind->adapter, buffer);
912 GST_OBJECT_UNLOCK (typefind);
914 res = gst_type_find_element_chain_do_typefinding (typefind, TRUE, FALSE);
916 if (typefind->mode == MODE_ERROR)
917 res = GST_FLOW_ERROR;
922 g_assert_not_reached ();
923 return GST_FLOW_ERROR;
930 gst_type_find_element_chain_do_typefinding (GstTypeFindElement * typefind,
931 gboolean check_avail, gboolean at_eos)
933 GstTypeFindProbability probability;
934 GstCaps *caps = NULL;
937 gboolean have_min, have_max;
940 GST_OBJECT_LOCK (typefind);
941 if (typefind->force_caps) {
942 caps = gst_caps_ref (typefind->force_caps);
943 probability = GST_TYPE_FIND_MAXIMUM;
947 avail = gst_adapter_available (typefind->adapter);
950 have_min = avail >= TYPE_FIND_MIN_SIZE;
951 have_max = avail >= TYPE_FIND_MAX_SIZE;
953 have_min = avail > 0;
958 goto not_enough_data;
960 ext = gst_type_find_get_extension (typefind, typefind->sink);
961 /* map all available data */
962 data = gst_adapter_map (typefind->adapter, avail);
963 caps = gst_type_find_helper_for_data_with_extension (GST_OBJECT (typefind),
964 data, avail, ext, &probability);
965 gst_adapter_unmap (typefind->adapter);
968 if (caps == NULL && have_max)
970 else if (caps == NULL)
974 if (probability < typefind->min_probability)
975 goto low_probability;
978 GST_OBJECT_UNLOCK (typefind);
980 /* probability is good enough too, so let's make it known ... emitting this
981 * signal calls our object handler which sets the caps. */
982 /* Set to MODE_NORMAL before emitting have-type, in case it triggers a seek */
983 typefind->mode = MODE_NORMAL;
984 gst_type_find_element_emit_have_type (typefind, probability, caps);
986 /* .. and send out the accumulated data */
987 stop_typefinding (typefind);
988 gst_caps_unref (caps);
994 GST_OBJECT_UNLOCK (typefind);
997 GST_ELEMENT_ERROR (typefind, STREAM, TYPE_NOT_FOUND,
998 (_("Stream doesn't contain enough data.")),
999 ("Can't typefind stream"));
1000 return GST_FLOW_ERROR;
1002 GST_DEBUG_OBJECT (typefind, "not enough data for typefinding yet "
1003 "(%" G_GSIZE_FORMAT " bytes)", avail);
1009 GST_OBJECT_UNLOCK (typefind);
1010 GST_ELEMENT_ERROR (typefind, STREAM, TYPE_NOT_FOUND, (NULL), (NULL));
1011 stop_typefinding (typefind);
1012 return GST_FLOW_ERROR;
1016 GST_OBJECT_UNLOCK (typefind);
1019 GST_ELEMENT_ERROR (typefind, STREAM, TYPE_NOT_FOUND,
1020 (_("Stream doesn't contain enough data.")),
1021 ("Can't typefind stream"));
1022 return GST_FLOW_ERROR;
1024 GST_DEBUG_OBJECT (typefind,
1025 "no caps found with %" G_GSIZE_FORMAT " bytes of data, "
1026 "waiting for more data", avail);
1032 GST_DEBUG_OBJECT (typefind, "found caps %" GST_PTR_FORMAT ", but "
1033 "probability is %u which is lower than the required minimum of %u",
1034 caps, probability, typefind->min_probability);
1036 gst_caps_unref (caps);
1041 GST_OBJECT_UNLOCK (typefind);
1042 GST_DEBUG_OBJECT (typefind, "waiting for more data to try again");
1047 static GstFlowReturn
1048 gst_type_find_element_getrange (GstPad * srcpad, GstObject * parent,
1049 guint64 offset, guint length, GstBuffer ** buffer)
1051 GstTypeFindElement *typefind;
1054 typefind = GST_TYPE_FIND_ELEMENT (parent);
1056 ret = gst_pad_pull_range (typefind->sink, offset, length, buffer);
1062 gst_type_find_element_activate_src_mode (GstPad * pad, GstObject * parent,
1063 GstPadMode mode, gboolean active)
1066 GstTypeFindElement *typefind;
1068 typefind = GST_TYPE_FIND_ELEMENT (parent);
1071 case GST_PAD_MODE_PULL:
1072 /* make sure our task stops pushing, we can't call _stop here because this
1073 * activation might happen from the streaming thread. */
1074 gst_pad_pause_task (typefind->sink);
1075 res = gst_pad_activate_mode (typefind->sink, mode, active);
1085 gst_type_find_element_loop (GstPad * pad)
1087 GstTypeFindElement *typefind;
1088 GstFlowReturn ret = GST_FLOW_OK;
1090 typefind = GST_TYPE_FIND_ELEMENT (GST_PAD_PARENT (pad));
1092 if (typefind->need_stream_start) {
1096 stream_id = gst_pad_create_stream_id (typefind->src,
1097 GST_ELEMENT_CAST (typefind), NULL);
1099 GST_DEBUG_OBJECT (typefind, "Pushing STREAM_START");
1100 event = gst_event_new_stream_start (stream_id);
1101 gst_event_set_group_id (event, gst_util_group_id_next ());
1102 gst_pad_push_event (typefind->src, event);
1104 typefind->need_stream_start = FALSE;
1108 if (typefind->mode == MODE_TYPEFIND) {
1109 GstPad *peer = NULL;
1110 GstCaps *found_caps = NULL;
1111 GstTypeFindProbability probability = GST_TYPE_FIND_NONE;
1113 GST_DEBUG_OBJECT (typefind, "find type in pull mode");
1115 GST_OBJECT_LOCK (typefind);
1116 if (typefind->force_caps) {
1117 found_caps = gst_caps_ref (typefind->force_caps);
1118 probability = GST_TYPE_FIND_MAXIMUM;
1120 GST_OBJECT_UNLOCK (typefind);
1123 peer = gst_pad_get_peer (pad);
1128 if (!gst_pad_query_duration (peer, GST_FORMAT_BYTES, &size)) {
1129 GST_WARNING_OBJECT (typefind, "Could not query upstream length!");
1130 gst_object_unref (peer);
1132 ret = GST_FLOW_ERROR;
1136 /* the size if 0, we cannot continue */
1138 /* keep message in sync with message in sink event handler */
1139 GST_ELEMENT_ERROR (typefind, STREAM, TYPE_NOT_FOUND,
1140 (_("Stream contains no data.")), ("Can't typefind empty stream"));
1141 gst_object_unref (peer);
1142 ret = GST_FLOW_ERROR;
1145 ext = gst_type_find_get_extension (typefind, pad);
1148 gst_type_find_helper_get_range_full (GST_OBJECT_CAST (peer),
1149 GST_OBJECT_PARENT (peer),
1150 (GstTypeFindHelperGetRangeFunction) (GST_PAD_GETRANGEFUNC (peer)),
1151 (guint64) size, ext, &found_caps, &probability);
1154 GST_DEBUG ("Found caps %" GST_PTR_FORMAT, found_caps);
1156 gst_object_unref (peer);
1158 if (ret != GST_FLOW_OK)
1163 if (!found_caps || probability < typefind->min_probability) {
1164 GST_DEBUG ("Trying to guess using extension");
1165 gst_caps_replace (&found_caps, NULL);
1167 gst_type_find_guess_by_extension (typefind, pad, &probability);
1170 if (!found_caps || probability < typefind->min_probability) {
1171 GST_ELEMENT_ERROR (typefind, STREAM, TYPE_NOT_FOUND, (NULL), (NULL));
1172 gst_caps_replace (&found_caps, NULL);
1173 ret = GST_FLOW_ERROR;
1177 GST_DEBUG ("Emitting found caps %" GST_PTR_FORMAT, found_caps);
1178 /* Set to MODE_NORMAL before emitting have-type, in case it triggers a seek */
1179 typefind->mode = MODE_NORMAL;
1180 gst_type_find_element_emit_have_type (typefind, probability, found_caps);
1181 gst_caps_unref (found_caps);
1182 } else if (typefind->mode == MODE_NORMAL) {
1183 GstBuffer *outbuf = NULL;
1185 if (typefind->need_segment) {
1187 typefind->need_segment = FALSE;
1188 event = gst_event_new_segment (&typefind->segment);
1189 if (typefind->seqnum != 0)
1190 gst_event_set_seqnum (event, typefind->seqnum);
1191 gst_pad_push_event (typefind->src, event);
1194 /* Pull 4k blocks and send downstream */
1195 ret = gst_pad_pull_range (typefind->sink, typefind->offset, 4096, &outbuf);
1196 if (ret != GST_FLOW_OK)
1199 typefind->offset += gst_buffer_get_size (outbuf);
1201 ret = gst_pad_push (typefind->src, outbuf);
1202 if (ret != GST_FLOW_OK)
1206 ret = GST_FLOW_ERROR;
1214 const gchar *reason = gst_flow_get_name (ret);
1215 gboolean push_eos = FALSE;
1217 GST_LOG_OBJECT (typefind, "pausing task, reason %s", reason);
1218 gst_pad_pause_task (typefind->sink);
1220 if (ret == GST_FLOW_EOS) {
1221 /* perform EOS logic */
1223 if (typefind->segment.flags & GST_SEGMENT_FLAG_SEGMENT) {
1226 /* for segment playback we need to post when (in stream time)
1227 * we stopped, this is either stop (when set) or the duration. */
1228 if ((stop = typefind->segment.stop) == -1)
1229 stop = typefind->offset;
1231 GST_LOG_OBJECT (typefind, "Sending segment done, at end of segment");
1232 gst_element_post_message (GST_ELEMENT (typefind),
1233 gst_message_new_segment_done (GST_OBJECT (typefind),
1234 GST_FORMAT_BYTES, stop));
1235 gst_pad_push_event (typefind->src,
1236 gst_event_new_segment_done (GST_FORMAT_BYTES, stop));
1240 } else if (ret == GST_FLOW_NOT_LINKED || ret < GST_FLOW_EOS) {
1241 /* for fatal errors we post an error message */
1242 GST_ELEMENT_FLOW_ERROR (typefind, ret);
1246 /* send EOS, and prevent hanging if no streams yet */
1247 GST_LOG_OBJECT (typefind, "Sending EOS, at end of stream");
1248 gst_pad_push_event (typefind->src, gst_event_new_eos ());
1255 gst_type_find_element_activate_sink_mode (GstPad * pad, GstObject * parent,
1256 GstPadMode mode, gboolean active)
1259 GstTypeFindElement *typefind;
1261 typefind = GST_TYPE_FIND_ELEMENT (parent);
1264 case GST_PAD_MODE_PULL:
1266 gst_segment_init (&typefind->segment, GST_FORMAT_BYTES);
1267 typefind->need_segment = TRUE;
1268 typefind->need_stream_start = TRUE;
1269 typefind->offset = 0;
1270 typefind->seqnum = 0;
1273 res = gst_pad_stop_task (pad);
1274 gst_segment_init (&typefind->segment, GST_FORMAT_UNDEFINED);
1277 case GST_PAD_MODE_PUSH:
1279 gst_segment_init (&typefind->segment, GST_FORMAT_UNDEFINED);
1280 start_typefinding (typefind);
1282 stop_typefinding (typefind);
1283 gst_segment_init (&typefind->segment, GST_FORMAT_UNDEFINED);
1295 gst_type_find_element_activate_sink (GstPad * pad, GstObject * parent)
1300 query = gst_query_new_scheduling ();
1302 if (!gst_pad_peer_query (pad, query)) {
1303 gst_query_unref (query);
1307 pull_mode = gst_query_has_scheduling_mode_with_flags (query,
1308 GST_PAD_MODE_PULL, GST_SCHEDULING_FLAG_SEEKABLE);
1310 gst_query_unref (query);
1315 if (!gst_pad_activate_mode (pad, GST_PAD_MODE_PULL, TRUE))
1318 /* only start our task if we ourselves decide to start in pull mode */
1319 return gst_pad_start_task (pad, (GstTaskFunction) gst_type_find_element_loop,
1324 return gst_pad_activate_mode (pad, GST_PAD_MODE_PUSH, TRUE);
1328 static GstStateChangeReturn
1329 gst_type_find_element_change_state (GstElement * element,
1330 GstStateChange transition)
1332 GstStateChangeReturn ret;
1333 GstTypeFindElement *typefind;
1335 typefind = GST_TYPE_FIND_ELEMENT (element);
1338 ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
1340 switch (transition) {
1341 case GST_STATE_CHANGE_PAUSED_TO_READY:
1342 case GST_STATE_CHANGE_READY_TO_NULL:
1343 GST_OBJECT_LOCK (typefind);
1344 gst_caps_replace (&typefind->caps, NULL);
1346 g_list_foreach (typefind->cached_events,
1347 (GFunc) gst_mini_object_unref, NULL);
1348 g_list_free (typefind->cached_events);
1349 typefind->cached_events = NULL;
1350 typefind->mode = MODE_TYPEFIND;
1351 GST_OBJECT_UNLOCK (typefind);