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., 59 Temple Place - Suite 330,
19 * Boston, MA 02111-1307, USA.
22 * SECTION:element-typefind
24 * Determines the media-type of a stream. It applies typefind functions in the
25 * order of their rank. One the type has been deteted it sets its src pad caps
26 * to the found media type.
28 * Whenever a type is found the #GstTypeFindElement::have-type signal is
29 * emitted, either from the streaming thread or the application thread
30 * (the latter may happen when typefinding is done pull-based from the
31 * state change function).
33 * Plugins can register custom typefinders by using #GstTypeFindFactory.
36 /* FIXME: need a better solution for non-seekable streams */
39 * 1) get a list of all typefind functions sorted best to worst
40 * 2) if all elements have been called with all requested data goto 8
41 * 3) call all functions once with all available data
42 * 4) if a function returns a value >= PROP_MAXIMUM goto 8
43 * 5) all functions with a result > PROP_MINIMUM or functions that did not get
44 * all requested data (where peek returned NULL) stay in list
45 * 6) seek to requested offset of best function that still has open data
48 * 8) take best available result and use its caps
50 * The element has two scheduling modes:
52 * 1) chain based, it will collect buffers and run the typefind function on
53 * the buffer until something is found.
54 * 2) getrange based, it will proxy the getrange function to the sinkpad. It
55 * is assumed that the peer element is happy with whatever format we
58 * By default it tries to do pull based typefinding (this avoids joining
59 * received buffers and holding them back in store.)
61 * When the element has no connected srcpad, and the sinkpad can operate in
62 * getrange based mode, the element starts its own task to figure out the
65 * Most of the actual implementation is in libs/gst/base/gsttypefindhelper.c.
72 #include "gst/gst_private.h"
74 #include "gsttypefindelement.h"
75 #include "gst/gst-i18n-lib.h"
76 #include "gst/base/gsttypefindhelper.h"
78 #include <gst/gsttypefind.h>
79 #include <gst/gstutils.h>
80 #include <gst/gsterror.h>
82 GST_DEBUG_CATEGORY_STATIC (gst_type_find_element_debug);
83 #define GST_CAT_DEFAULT gst_type_find_element_debug
85 /* generic templates */
86 static GstStaticPadTemplate type_find_element_sink_template =
87 GST_STATIC_PAD_TEMPLATE ("sink",
92 static GstStaticPadTemplate type_find_element_src_template =
93 GST_STATIC_PAD_TEMPLATE ("src",
98 /* Require at least 2kB of data before we attempt typefinding in chain-mode.
99 * 128kB is massive overkill for the maximum, but doesn't do any harm */
100 #define TYPE_FIND_MIN_SIZE (2*1024)
101 #define TYPE_FIND_MAX_SIZE (128*1024)
103 /* TypeFind signals and args */
120 MODE_NORMAL, /* act as identity */
121 MODE_TYPEFIND, /* do typefinding */
122 MODE_ERROR /* had fatal error */
127 GST_DEBUG_CATEGORY_INIT (gst_type_find_element_debug, "typefind", \
128 GST_DEBUG_BG_YELLOW | GST_DEBUG_FG_GREEN, "type finding element");
129 #define gst_type_find_element_parent_class parent_class
130 G_DEFINE_TYPE_WITH_CODE (GstTypeFindElement, gst_type_find_element,
131 GST_TYPE_ELEMENT, _do_init);
133 static void gst_type_find_element_dispose (GObject * object);
134 static void gst_type_find_element_set_property (GObject * object,
135 guint prop_id, const GValue * value, GParamSpec * pspec);
136 static void gst_type_find_element_get_property (GObject * object,
137 guint prop_id, GValue * value, GParamSpec * pspec);
140 static const GstEventMask *gst_type_find_element_src_event_mask (GstPad * pad);
143 static gboolean gst_type_find_element_src_event (GstPad * pad,
144 GstObject * parent, GstEvent * event);
145 static gboolean gst_type_find_handle_src_query (GstPad * pad,
146 GstObject * parent, GstQuery * query);
148 static gboolean gst_type_find_element_sink_event (GstPad * pad,
149 GstObject * parent, GstEvent * event);
150 static gboolean gst_type_find_element_setcaps (GstTypeFindElement * typefind,
152 static GstFlowReturn gst_type_find_element_chain (GstPad * sinkpad,
153 GstObject * parent, GstBuffer * buffer);
154 static GstFlowReturn gst_type_find_element_getrange (GstPad * srcpad,
155 GstObject * parent, guint64 offset, guint length, GstBuffer ** buffer);
157 static GstStateChangeReturn
158 gst_type_find_element_change_state (GstElement * element,
159 GstStateChange transition);
160 static gboolean gst_type_find_element_activate_sink (GstPad * pad,
162 static gboolean gst_type_find_element_activate_sink_mode (GstPad * pad,
163 GstObject * parent, GstPadMode mode, gboolean active);
164 static gboolean gst_type_find_element_activate_src_mode (GstPad * pad,
165 GstObject * parent, GstPadMode mode, gboolean active);
167 gst_type_find_element_chain_do_typefinding (GstTypeFindElement * typefind,
168 gboolean check_avail);
169 static void gst_type_find_element_send_cached_events (GstTypeFindElement *
172 static void gst_type_find_element_loop (GstPad * pad);
174 static guint gst_type_find_element_signals[LAST_SIGNAL] = { 0 };
177 gst_type_find_element_have_type (GstTypeFindElement * typefind,
178 guint probability, const GstCaps * caps)
182 g_assert (caps != NULL);
184 GST_INFO_OBJECT (typefind, "found caps %" GST_PTR_FORMAT ", probability=%u",
187 GST_OBJECT_LOCK (typefind);
189 gst_caps_unref (typefind->caps);
190 typefind->caps = gst_caps_copy (caps);
191 copy = gst_caps_ref (typefind->caps);
192 GST_OBJECT_UNLOCK (typefind);
194 gst_pad_push_event (typefind->src, gst_event_new_caps (copy));
195 gst_caps_unref (copy);
199 gst_type_find_element_class_init (GstTypeFindElementClass * typefind_class)
201 GObjectClass *gobject_class = G_OBJECT_CLASS (typefind_class);
202 GstElementClass *gstelement_class = GST_ELEMENT_CLASS (typefind_class);
204 gobject_class->set_property = gst_type_find_element_set_property;
205 gobject_class->get_property = gst_type_find_element_get_property;
206 gobject_class->dispose = gst_type_find_element_dispose;
208 g_object_class_install_property (gobject_class, PROP_CAPS,
209 g_param_spec_boxed ("caps", _("caps"),
210 _("detected capabilities in stream"), GST_TYPE_CAPS,
211 G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
212 g_object_class_install_property (gobject_class, PROP_MINIMUM,
213 g_param_spec_uint ("minimum", _("minimum"),
214 "minimum probability required to accept caps", GST_TYPE_FIND_MINIMUM,
215 GST_TYPE_FIND_MAXIMUM, GST_TYPE_FIND_MINIMUM,
216 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
217 g_object_class_install_property (gobject_class, PROP_MAXIMUM,
218 g_param_spec_uint ("maximum", _("maximum"),
219 "probability to stop typefinding (deprecated; non-functional)",
220 GST_TYPE_FIND_MINIMUM, GST_TYPE_FIND_MAXIMUM, GST_TYPE_FIND_MAXIMUM,
221 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
222 g_object_class_install_property (gobject_class, PROP_FORCE_CAPS,
223 g_param_spec_boxed ("force-caps", _("force caps"),
224 _("force caps without doing a typefind"), GST_TYPE_CAPS,
225 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
227 * GstTypeFindElement::have-type:
228 * @typefind: the typefind instance
229 * @probability: the probability of the type found
230 * @caps: the caps of the type found
232 * This signal gets emitted when the type and its probability has
235 gst_type_find_element_signals[HAVE_TYPE] = g_signal_new ("have-type",
236 G_TYPE_FROM_CLASS (typefind_class), G_SIGNAL_RUN_FIRST,
237 G_STRUCT_OFFSET (GstTypeFindElementClass, have_type), NULL, NULL,
238 gst_marshal_VOID__UINT_BOXED, G_TYPE_NONE, 2,
239 G_TYPE_UINT, GST_TYPE_CAPS | G_SIGNAL_TYPE_STATIC_SCOPE);
241 typefind_class->have_type =
242 GST_DEBUG_FUNCPTR (gst_type_find_element_have_type);
244 gst_element_class_set_details_simple (gstelement_class,
247 "Finds the media type of a stream",
248 "Benjamin Otte <in7y118@public.uni-hamburg.de>");
249 gst_element_class_add_pad_template (gstelement_class,
250 gst_static_pad_template_get (&type_find_element_src_template));
251 gst_element_class_add_pad_template (gstelement_class,
252 gst_static_pad_template_get (&type_find_element_sink_template));
254 gstelement_class->change_state =
255 GST_DEBUG_FUNCPTR (gst_type_find_element_change_state);
259 gst_type_find_element_init (GstTypeFindElement * typefind)
263 gst_pad_new_from_static_template (&type_find_element_sink_template,
266 gst_pad_set_activate_function (typefind->sink,
267 GST_DEBUG_FUNCPTR (gst_type_find_element_activate_sink));
268 gst_pad_set_activatemode_function (typefind->sink,
269 GST_DEBUG_FUNCPTR (gst_type_find_element_activate_sink_mode));
270 gst_pad_set_chain_function (typefind->sink,
271 GST_DEBUG_FUNCPTR (gst_type_find_element_chain));
272 gst_pad_set_event_function (typefind->sink,
273 GST_DEBUG_FUNCPTR (gst_type_find_element_sink_event));
274 gst_element_add_pad (GST_ELEMENT (typefind), typefind->sink);
278 gst_pad_new_from_static_template (&type_find_element_src_template, "src");
280 gst_pad_set_activatemode_function (typefind->src,
281 GST_DEBUG_FUNCPTR (gst_type_find_element_activate_src_mode));
282 gst_pad_set_getrange_function (typefind->src,
283 GST_DEBUG_FUNCPTR (gst_type_find_element_getrange));
284 gst_pad_set_event_function (typefind->src,
285 GST_DEBUG_FUNCPTR (gst_type_find_element_src_event));
286 gst_pad_set_query_function (typefind->src,
287 GST_DEBUG_FUNCPTR (gst_type_find_handle_src_query));
288 gst_pad_use_fixed_caps (typefind->src);
289 gst_element_add_pad (GST_ELEMENT (typefind), typefind->src);
291 typefind->mode = MODE_TYPEFIND;
292 typefind->caps = NULL;
293 typefind->min_probability = 1;
294 typefind->max_probability = GST_TYPE_FIND_MAXIMUM;
296 typefind->adapter = gst_adapter_new ();
300 gst_type_find_element_dispose (GObject * object)
302 GstTypeFindElement *typefind = GST_TYPE_FIND_ELEMENT (object);
304 if (typefind->adapter) {
305 g_object_unref (typefind->adapter);
306 typefind->adapter = NULL;
309 if (typefind->force_caps) {
310 gst_caps_unref (typefind->force_caps);
311 typefind->force_caps = NULL;
314 G_OBJECT_CLASS (parent_class)->dispose (object);
318 gst_type_find_element_set_property (GObject * object, guint prop_id,
319 const GValue * value, GParamSpec * pspec)
321 GstTypeFindElement *typefind;
323 typefind = GST_TYPE_FIND_ELEMENT (object);
327 typefind->min_probability = g_value_get_uint (value);
330 typefind->max_probability = g_value_get_uint (value);
332 case PROP_FORCE_CAPS:
333 GST_OBJECT_LOCK (typefind);
334 if (typefind->force_caps)
335 gst_caps_unref (typefind->force_caps);
336 typefind->force_caps = g_value_dup_boxed (value);
337 GST_OBJECT_UNLOCK (typefind);
340 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
346 gst_type_find_element_get_property (GObject * object, guint prop_id,
347 GValue * value, GParamSpec * pspec)
349 GstTypeFindElement *typefind;
351 typefind = GST_TYPE_FIND_ELEMENT (object);
355 GST_OBJECT_LOCK (typefind);
356 g_value_set_boxed (value, typefind->caps);
357 GST_OBJECT_UNLOCK (typefind);
360 g_value_set_uint (value, typefind->min_probability);
363 g_value_set_uint (value, typefind->max_probability);
365 case PROP_FORCE_CAPS:
366 GST_OBJECT_LOCK (typefind);
367 g_value_set_boxed (value, typefind->force_caps);
368 GST_OBJECT_UNLOCK (typefind);
371 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
377 gst_type_find_handle_src_query (GstPad * pad, GstObject * parent,
380 GstTypeFindElement *typefind;
381 gboolean res = FALSE;
383 typefind = GST_TYPE_FIND_ELEMENT (parent);
384 GST_DEBUG_OBJECT (typefind, "Handling src query %s",
385 GST_QUERY_TYPE_NAME (query));
387 switch (GST_QUERY_TYPE (query)) {
388 case GST_QUERY_SCHEDULING:
389 /* FIXME, filter out the scheduling modes that we understand */
390 res = gst_pad_peer_query (typefind->sink, query);
394 GST_DEBUG_OBJECT (typefind,
395 "Got caps query, our caps are %" GST_PTR_FORMAT, typefind->caps);
397 /* We can hijack caps query if we typefind already */
398 if (typefind->caps) {
399 gst_query_set_caps_result (query, typefind->caps);
402 res = gst_pad_peer_query (typefind->sink, query);
406 case GST_QUERY_POSITION:
411 if (!(res = gst_pad_peer_query (typefind->sink, query)))
414 gst_query_parse_position (query, &format, &peer_pos);
416 GST_OBJECT_LOCK (typefind);
417 /* FIXME: this code assumes that there's no discont in the queue */
419 case GST_FORMAT_BYTES:
420 peer_pos -= gst_adapter_available (typefind->adapter);
426 GST_OBJECT_UNLOCK (typefind);
427 gst_query_set_position (query, format, peer_pos);
431 res = gst_pad_query_default (pad, parent, query);
439 gst_type_find_element_seek (GstTypeFindElement * typefind, GstEvent * event)
442 GstSeekType cur_type, stop_type;
447 GstSegment seeksegment = { 0, };
449 gst_event_parse_seek (event, &rate, &format, &flags, &cur_type, &cur,
452 /* we can only seek on bytes */
453 if (format != GST_FORMAT_BYTES) {
454 GST_DEBUG_OBJECT (typefind, "Can only seek on BYTES");
458 /* copy segment, we need this because we still need the old
459 * segment when we close the current segment. */
460 memcpy (&seeksegment, &typefind->segment, sizeof (GstSegment));
462 GST_DEBUG_OBJECT (typefind, "configuring seek");
463 gst_segment_do_seek (&seeksegment, rate, format, flags,
464 cur_type, cur, stop_type, stop, NULL);
466 flush = ! !(flags & GST_SEEK_FLAG_FLUSH);
468 GST_DEBUG_OBJECT (typefind, "New segment %" GST_SEGMENT_FORMAT, &seeksegment);
471 GST_DEBUG_OBJECT (typefind, "Starting flush");
472 gst_pad_push_event (typefind->sink, gst_event_new_flush_start ());
473 gst_pad_push_event (typefind->src, gst_event_new_flush_start ());
475 GST_DEBUG_OBJECT (typefind, "Non-flushing seek, pausing task");
476 gst_pad_pause_task (typefind->sink);
479 /* now grab the stream lock so that streaming cannot continue, for
480 * non flushing seeks when the element is in PAUSED this could block
482 GST_DEBUG_OBJECT (typefind, "Waiting for streaming to stop");
483 GST_PAD_STREAM_LOCK (typefind->sink);
486 GST_DEBUG_OBJECT (typefind, "Stopping flush");
487 gst_pad_push_event (typefind->sink, gst_event_new_flush_stop (TRUE));
488 gst_pad_push_event (typefind->src, gst_event_new_flush_stop (TRUE));
491 /* now update the real segment info */
492 GST_DEBUG_OBJECT (typefind, "Committing new seek segment");
493 memcpy (&typefind->segment, &seeksegment, sizeof (GstSegment));
494 typefind->offset = typefind->segment.start;
496 /* notify start of new segment */
497 if (typefind->segment.flags & GST_SEEK_FLAG_SEGMENT) {
500 msg = gst_message_new_segment_start (GST_OBJECT (typefind),
501 GST_FORMAT_BYTES, typefind->segment.start);
502 gst_element_post_message (GST_ELEMENT (typefind), msg);
505 typefind->need_segment = TRUE;
507 /* restart our task since it might have been stopped when we did the
509 gst_pad_start_task (typefind->sink,
510 (GstTaskFunction) gst_type_find_element_loop, typefind->sink);
512 /* streaming can continue now */
513 GST_PAD_STREAM_UNLOCK (typefind->sink);
519 gst_type_find_element_src_event (GstPad * pad, GstObject * parent,
522 GstTypeFindElement *typefind = GST_TYPE_FIND_ELEMENT (parent);
524 if (typefind->mode != MODE_NORMAL) {
525 /* need to do more? */
526 gst_mini_object_unref (GST_MINI_OBJECT_CAST (event));
530 /* Only handle seeks here if driving the pipeline */
531 if (typefind->segment.format != GST_FORMAT_UNDEFINED &&
532 GST_EVENT_TYPE (event) == GST_EVENT_SEEK) {
533 return gst_type_find_element_seek (typefind, event);
535 return gst_pad_push_event (typefind->sink, event);
540 start_typefinding (GstTypeFindElement * typefind)
542 GST_DEBUG_OBJECT (typefind, "starting typefinding");
544 GST_OBJECT_LOCK (typefind);
546 gst_caps_replace (&typefind->caps, NULL);
547 GST_OBJECT_UNLOCK (typefind);
549 typefind->mode = MODE_TYPEFIND;
553 stop_typefinding (GstTypeFindElement * typefind)
556 gboolean push_cached_buffers;
560 gst_element_get_state (GST_ELEMENT (typefind), &state, NULL, 0);
562 push_cached_buffers = (state >= GST_STATE_PAUSED);
564 GST_DEBUG_OBJECT (typefind, "stopping typefinding%s",
565 push_cached_buffers ? " and pushing cached buffers" : "");
567 GST_OBJECT_LOCK (typefind);
568 avail = gst_adapter_available (typefind->adapter);
572 buffer = gst_adapter_take_buffer (typefind->adapter, avail);
573 GST_OBJECT_UNLOCK (typefind);
575 if (!push_cached_buffers) {
576 gst_buffer_unref (buffer);
578 GstPad *peer = gst_pad_get_peer (typefind->src);
580 typefind->mode = MODE_NORMAL;
582 /* make sure the user gets a meaningful error message in this case,
583 * which is not a core bug or bug of any kind (as the default error
584 * message emitted by gstpad.c otherwise would make you think) */
585 if (peer && GST_PAD_CHAINFUNC (peer) == NULL) {
586 GST_DEBUG_OBJECT (typefind, "upstream only supports push mode, while "
587 "downstream element only works in pull mode, erroring out");
588 GST_ELEMENT_ERROR (typefind, STREAM, FAILED,
589 ("%s cannot work in push mode. The operation is not supported "
590 "with this source element or protocol.",
591 G_OBJECT_TYPE_NAME (GST_PAD_PARENT (peer))),
592 ("Downstream pad %s:%s has no chainfunction, and the upstream "
593 "element does not support pull mode", GST_DEBUG_PAD_NAME (peer)));
594 typefind->mode = MODE_ERROR; /* make the chain function error out */
595 gst_buffer_unref (buffer);
597 gst_type_find_element_send_cached_events (typefind);
598 gst_pad_push (typefind->src, buffer);
601 gst_object_unref (peer);
608 GST_DEBUG_OBJECT (typefind, "we have no data to typefind");
609 GST_OBJECT_UNLOCK (typefind);
615 gst_type_find_element_sink_event (GstPad * pad, GstObject * parent,
618 gboolean res = FALSE;
619 GstTypeFindElement *typefind = GST_TYPE_FIND_ELEMENT (parent);
621 GST_DEBUG_OBJECT (typefind, "got %s event in mode %d",
622 GST_EVENT_TYPE_NAME (event), typefind->mode);
624 switch (typefind->mode) {
626 switch (GST_EVENT_TYPE (event)) {
631 /* first pass the caps event downstream */
632 res = gst_pad_push_event (typefind->src, gst_event_ref (event));
634 /* then parse and push out our data */
635 gst_event_parse_caps (event, &caps);
636 res = gst_type_find_element_setcaps (typefind, caps);
638 gst_event_unref (event);
643 GST_INFO_OBJECT (typefind, "Got EOS and no type found yet");
644 gst_type_find_element_chain_do_typefinding (typefind, FALSE);
646 res = gst_pad_push_event (typefind->src, event);
649 case GST_EVENT_FLUSH_STOP:
650 GST_OBJECT_LOCK (typefind);
651 g_list_foreach (typefind->cached_events,
652 (GFunc) gst_mini_object_unref, NULL);
653 g_list_free (typefind->cached_events);
654 typefind->cached_events = NULL;
655 gst_adapter_clear (typefind->adapter);
656 GST_OBJECT_UNLOCK (typefind);
658 case GST_EVENT_FLUSH_START:
659 res = gst_pad_push_event (typefind->src, event);
662 GST_DEBUG_OBJECT (typefind, "Saving %s event to send later",
663 GST_EVENT_TYPE_NAME (event));
664 GST_OBJECT_LOCK (typefind);
665 typefind->cached_events =
666 g_list_append (typefind->cached_events, event);
667 GST_OBJECT_UNLOCK (typefind);
673 res = gst_pad_push_event (typefind->src, event);
678 g_assert_not_reached ();
684 gst_type_find_element_send_cached_events (GstTypeFindElement * typefind)
686 GList *l, *cached_events;
688 GST_OBJECT_LOCK (typefind);
689 cached_events = typefind->cached_events;
690 typefind->cached_events = NULL;
691 GST_OBJECT_UNLOCK (typefind);
693 for (l = cached_events; l != NULL; l = l->next) {
694 GstEvent *event = GST_EVENT (l->data);
696 GST_DEBUG_OBJECT (typefind, "sending cached %s event",
697 GST_EVENT_TYPE_NAME (event));
698 gst_pad_push_event (typefind->src, event);
700 g_list_free (cached_events);
704 gst_type_find_element_setcaps (GstTypeFindElement * typefind, GstCaps * caps)
706 /* don't operate on ANY caps */
707 if (gst_caps_is_any (caps))
710 g_signal_emit (typefind, gst_type_find_element_signals[HAVE_TYPE], 0,
711 GST_TYPE_FIND_MAXIMUM, caps);
713 /* Shortcircuit typefinding if we get caps */
714 if (typefind->mode == MODE_TYPEFIND) {
718 GST_DEBUG_OBJECT (typefind, "Skipping typefinding, using caps from "
719 "upstream buffer: %" GST_PTR_FORMAT, caps);
720 typefind->mode = MODE_NORMAL;
722 gst_type_find_element_send_cached_events (typefind);
723 GST_OBJECT_LOCK (typefind);
724 avail = gst_adapter_available (typefind->adapter);
728 buffer = gst_adapter_take_buffer (typefind->adapter, avail);
729 GST_OBJECT_UNLOCK (typefind);
731 GST_DEBUG_OBJECT (typefind, "Pushing buffer: %" G_GSIZE_FORMAT, avail);
732 gst_pad_push (typefind->src, buffer);
739 GST_DEBUG_OBJECT (typefind, "no data to push");
740 GST_OBJECT_UNLOCK (typefind);
746 gst_type_find_get_extension (GstTypeFindElement * typefind, GstPad * pad)
753 query = gst_query_new_uri ();
755 /* try getting the caps with an uri query and from the extension */
756 if (!gst_pad_peer_query (pad, query))
757 goto peer_query_failed;
759 gst_query_parse_uri (query, &uri);
763 GST_DEBUG_OBJECT (typefind, "finding extension of %s", uri);
765 /* find the extension on the uri, this is everything after a '.' */
770 if (uri[find] == '.')
777 result = g_strdup (&uri[find + 1]);
779 GST_DEBUG_OBJECT (typefind, "found extension %s", result);
780 gst_query_unref (query);
788 GST_WARNING_OBJECT (typefind, "failed to query peer uri");
789 gst_query_unref (query);
794 GST_WARNING_OBJECT (typefind, "could not parse the peer uri");
795 gst_query_unref (query);
800 GST_WARNING_OBJECT (typefind, "could not find uri extension in %s", uri);
801 gst_query_unref (query);
808 gst_type_find_guess_by_extension (GstTypeFindElement * typefind, GstPad * pad,
809 GstTypeFindProbability * probability)
814 ext = gst_type_find_get_extension (typefind, pad);
818 caps = gst_type_find_helper_for_extension (GST_OBJECT_CAST (typefind), ext);
820 *probability = GST_TYPE_FIND_MAXIMUM;
828 gst_type_find_element_chain (GstPad * pad, GstObject * parent,
831 GstTypeFindElement *typefind;
832 GstFlowReturn res = GST_FLOW_OK;
834 typefind = GST_TYPE_FIND_ELEMENT (parent);
836 GST_LOG_OBJECT (typefind, "handling buffer in mode %d", typefind->mode);
838 switch (typefind->mode) {
840 /* we should already have called GST_ELEMENT_ERROR */
841 return GST_FLOW_ERROR;
843 /* don't take object lock as typefind->caps should not change anymore */
844 return gst_pad_push (typefind->src, buffer);
847 GST_OBJECT_LOCK (typefind);
848 gst_adapter_push (typefind->adapter, buffer);
849 GST_OBJECT_UNLOCK (typefind);
851 res = gst_type_find_element_chain_do_typefinding (typefind, TRUE);
853 if (typefind->mode == MODE_ERROR)
854 res = GST_FLOW_ERROR;
859 g_assert_not_reached ();
860 return GST_FLOW_ERROR;
867 gst_type_find_element_chain_do_typefinding (GstTypeFindElement * typefind,
868 gboolean check_avail)
870 GstTypeFindProbability probability;
874 gboolean have_min, have_max;
876 GST_OBJECT_LOCK (typefind);
877 avail = gst_adapter_available (typefind->adapter);
880 have_min = avail >= TYPE_FIND_MIN_SIZE;
881 have_max = avail >= TYPE_FIND_MAX_SIZE;
888 goto not_enough_data;
890 /* map all available data */
891 data = gst_adapter_map (typefind->adapter, avail);
892 caps = gst_type_find_helper_for_data (GST_OBJECT (typefind),
893 data, avail, &probability);
894 gst_adapter_unmap (typefind->adapter);
896 if (caps == NULL && have_max)
898 else if (caps == NULL)
902 if (probability < typefind->min_probability)
903 goto low_probability;
904 GST_OBJECT_UNLOCK (typefind);
906 /* probability is good enough too, so let's make it known ... emiting this
907 * signal calls our object handler which sets the caps. */
908 g_signal_emit (typefind, gst_type_find_element_signals[HAVE_TYPE], 0,
911 /* .. and send out the accumulated data */
912 stop_typefinding (typefind);
913 gst_caps_unref (caps);
919 GST_DEBUG_OBJECT (typefind, "not enough data for typefinding yet "
920 "(%" G_GSIZE_FORMAT " bytes)", avail);
921 GST_OBJECT_UNLOCK (typefind);
926 GST_OBJECT_UNLOCK (typefind);
927 GST_ELEMENT_ERROR (typefind, STREAM, TYPE_NOT_FOUND, (NULL), (NULL));
928 stop_typefinding (typefind);
929 return GST_FLOW_ERROR;
933 GST_DEBUG_OBJECT (typefind,
934 "no caps found with %" G_GSIZE_FORMAT " bytes of data, "
935 "waiting for more data", avail);
936 GST_OBJECT_UNLOCK (typefind);
941 GST_DEBUG_OBJECT (typefind, "found caps %" GST_PTR_FORMAT ", but "
942 "probability is %u which is lower than the required minimum of %u",
943 caps, probability, typefind->min_probability);
945 gst_caps_unref (caps);
950 GST_OBJECT_UNLOCK (typefind);
951 GST_DEBUG_OBJECT (typefind, "waiting for more data to try again");
957 gst_type_find_element_getrange (GstPad * srcpad, GstObject * parent,
958 guint64 offset, guint length, GstBuffer ** buffer)
960 GstTypeFindElement *typefind;
963 typefind = GST_TYPE_FIND_ELEMENT (parent);
965 ret = gst_pad_pull_range (typefind->sink, offset, length, buffer);
971 gst_type_find_element_activate_src_mode (GstPad * pad, GstObject * parent,
972 GstPadMode mode, gboolean active)
975 GstTypeFindElement *typefind;
977 typefind = GST_TYPE_FIND_ELEMENT (parent);
980 case GST_PAD_MODE_PULL:
981 /* make sure our task stops pushing, we can't call _stop here because this
982 * activation might happen from the streaming thread. */
983 gst_pad_pause_task (typefind->sink);
984 res = gst_pad_activate_mode (typefind->sink, mode, active);
985 if (typefind->caps) {
987 GST_OBJECT_LOCK (typefind);
988 caps = gst_caps_ref (typefind->caps);
989 GST_OBJECT_UNLOCK (typefind);
990 gst_pad_push_event (typefind->src, gst_event_new_caps (caps));
991 gst_caps_unref (caps);
1002 gst_type_find_element_loop (GstPad * pad)
1004 GstTypeFindElement *typefind;
1005 GstFlowReturn ret = GST_FLOW_OK;
1007 typefind = GST_TYPE_FIND_ELEMENT (GST_PAD_PARENT (pad));
1009 if (typefind->mode == MODE_TYPEFIND) {
1011 GstCaps *found_caps = NULL;
1012 GstTypeFindProbability probability = GST_TYPE_FIND_NONE;
1014 GST_DEBUG_OBJECT (typefind, "find type in pull mode");
1016 peer = gst_pad_get_peer (pad);
1021 if (!gst_pad_query_duration (peer, GST_FORMAT_BYTES, &size)) {
1022 GST_WARNING_OBJECT (typefind, "Could not query upstream length!");
1023 gst_object_unref (peer);
1025 ret = GST_FLOW_ERROR;
1029 /* the size if 0, we cannot continue */
1031 /* keep message in sync with message in sink event handler */
1032 GST_ELEMENT_ERROR (typefind, STREAM, TYPE_NOT_FOUND,
1033 (_("Stream contains no data.")), ("Can't typefind empty stream"));
1034 gst_object_unref (peer);
1035 ret = GST_FLOW_ERROR;
1038 ext = gst_type_find_get_extension (typefind, pad);
1041 gst_type_find_helper_get_range (GST_OBJECT_CAST (peer),
1042 GST_OBJECT_PARENT (peer),
1043 (GstTypeFindHelperGetRangeFunction) (GST_PAD_GETRANGEFUNC (peer)),
1044 (guint64) size, ext, &probability);
1047 GST_DEBUG ("Found caps %" GST_PTR_FORMAT, found_caps);
1049 gst_object_unref (peer);
1052 if (!found_caps || probability < typefind->min_probability) {
1053 GST_DEBUG ("Trying to guess using extension");
1055 gst_type_find_guess_by_extension (typefind, pad, &probability);
1058 if (!found_caps || probability < typefind->min_probability) {
1059 GST_ELEMENT_ERROR (typefind, STREAM, TYPE_NOT_FOUND, (NULL), (NULL));
1060 gst_caps_replace (&found_caps, NULL);
1061 ret = GST_FLOW_ERROR;
1065 GST_DEBUG ("Emiting found caps %" GST_PTR_FORMAT, found_caps);
1066 g_signal_emit (typefind, gst_type_find_element_signals[HAVE_TYPE],
1067 0, probability, found_caps);
1068 typefind->mode = MODE_NORMAL;
1069 } else if (typefind->mode == MODE_NORMAL) {
1072 if (typefind->need_segment) {
1073 typefind->need_segment = FALSE;
1074 gst_pad_push_event (typefind->src,
1075 gst_event_new_segment (&typefind->segment));
1078 /* Pull 4k blocks and send downstream */
1079 ret = gst_pad_pull_range (typefind->sink, typefind->offset, 4096, &outbuf);
1080 if (ret != GST_FLOW_OK)
1083 typefind->offset += 4096;
1085 ret = gst_pad_push (typefind->src, outbuf);
1086 if (ret != GST_FLOW_OK)
1090 ret = GST_FLOW_ERROR;
1098 const gchar *reason = gst_flow_get_name (ret);
1099 gboolean push_eos = FALSE;
1101 GST_LOG_OBJECT (typefind, "pausing task, reason %s", reason);
1102 gst_pad_pause_task (typefind->sink);
1104 if (ret == GST_FLOW_EOS) {
1105 /* perform EOS logic */
1107 if (typefind->segment.flags & GST_SEEK_FLAG_SEGMENT) {
1110 /* for segment playback we need to post when (in stream time)
1111 * we stopped, this is either stop (when set) or the duration. */
1112 if ((stop = typefind->segment.stop) == -1)
1113 stop = typefind->offset;
1115 GST_LOG_OBJECT (typefind, "Sending segment done, at end of segment");
1116 gst_element_post_message (GST_ELEMENT (typefind),
1117 gst_message_new_segment_done (GST_OBJECT (typefind),
1118 GST_FORMAT_BYTES, stop));
1122 } else if (ret == GST_FLOW_NOT_LINKED || ret < GST_FLOW_EOS) {
1123 /* for fatal errors we post an error message */
1124 GST_ELEMENT_ERROR (typefind, STREAM, FAILED, (NULL),
1125 ("stream stopped, reason %s", reason));
1129 /* send EOS, and prevent hanging if no streams yet */
1130 GST_LOG_OBJECT (typefind, "Sending EOS, at end of stream");
1131 gst_pad_push_event (typefind->src, gst_event_new_eos ());
1138 gst_type_find_element_activate_sink_mode (GstPad * pad, GstObject * parent,
1139 GstPadMode mode, gboolean active)
1142 GstTypeFindElement *typefind;
1144 typefind = GST_TYPE_FIND_ELEMENT (parent);
1147 case GST_PAD_MODE_PULL:
1149 gst_segment_init (&typefind->segment, GST_FORMAT_BYTES);
1150 typefind->need_segment = TRUE;
1151 typefind->offset = 0;
1154 res = gst_pad_stop_task (pad);
1157 case GST_PAD_MODE_PUSH:
1159 start_typefinding (typefind);
1161 stop_typefinding (typefind);
1173 gst_type_find_element_activate_sink (GstPad * pad, GstObject * parent)
1175 GstTypeFindElement *typefind;
1178 GstCaps *found_caps = NULL;
1179 GstTypeFindProbability probability = GST_TYPE_FIND_NONE;
1181 typefind = GST_TYPE_FIND_ELEMENT (parent);
1183 /* if we have force caps, use those */
1184 GST_OBJECT_LOCK (typefind);
1185 if (typefind->force_caps) {
1186 found_caps = gst_caps_ref (typefind->force_caps);
1187 probability = GST_TYPE_FIND_MAXIMUM;
1188 GST_OBJECT_UNLOCK (typefind);
1190 GST_DEBUG ("Emiting found caps %" GST_PTR_FORMAT, found_caps);
1191 g_signal_emit (typefind, gst_type_find_element_signals[HAVE_TYPE],
1192 0, probability, found_caps);
1193 typefind->mode = MODE_NORMAL;
1196 GST_OBJECT_UNLOCK (typefind);
1198 query = gst_query_new_scheduling ();
1200 if (!gst_pad_peer_query (pad, query)) {
1201 gst_query_unref (query);
1205 pull_mode = gst_query_has_scheduling_mode (query, GST_PAD_MODE_PULL);
1206 gst_query_unref (query);
1211 if (!gst_pad_activate_mode (pad, GST_PAD_MODE_PULL, TRUE))
1214 /* only start our task if we ourselves decide to start in pull mode */
1215 return gst_pad_start_task (pad, (GstTaskFunction) gst_type_find_element_loop,
1220 return gst_pad_activate_mode (pad, GST_PAD_MODE_PUSH, TRUE);
1224 static GstStateChangeReturn
1225 gst_type_find_element_change_state (GstElement * element,
1226 GstStateChange transition)
1228 GstStateChangeReturn ret;
1229 GstTypeFindElement *typefind;
1231 typefind = GST_TYPE_FIND_ELEMENT (element);
1234 ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
1236 switch (transition) {
1237 case GST_STATE_CHANGE_PAUSED_TO_READY:
1238 case GST_STATE_CHANGE_READY_TO_NULL:
1239 GST_OBJECT_LOCK (typefind);
1240 gst_caps_replace (&typefind->caps, NULL);
1242 g_list_foreach (typefind->cached_events,
1243 (GFunc) gst_mini_object_unref, NULL);
1244 g_list_free (typefind->cached_events);
1245 typefind->cached_events = NULL;
1246 typefind->mode = MODE_TYPEFIND;
1247 GST_OBJECT_UNLOCK (typefind);