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 "gst/gst-i18n-lib.h"
77 #include "gst/base/gsttypefindhelper.h"
79 #include <gst/gsttypefind.h>
80 #include <gst/gstutils.h>
81 #include <gst/gsterror.h>
83 GST_DEBUG_CATEGORY_STATIC (gst_type_find_element_debug);
84 #define GST_CAT_DEFAULT gst_type_find_element_debug
86 /* generic templates */
87 static GstStaticPadTemplate type_find_element_sink_template =
88 GST_STATIC_PAD_TEMPLATE ("sink",
93 static GstStaticPadTemplate type_find_element_src_template =
94 GST_STATIC_PAD_TEMPLATE ("src",
99 /* Require at least 2kB of data before we attempt typefinding in chain-mode.
100 * 128kB is massive overkill for the maximum, but doesn't do any harm */
101 #define TYPE_FIND_MIN_SIZE (2*1024)
102 #define TYPE_FIND_MAX_SIZE (128*1024)
104 /* 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);
139 static gboolean gst_type_find_element_src_event (GstPad * pad,
140 GstObject * parent, GstEvent * event);
141 static gboolean gst_type_find_handle_src_query (GstPad * pad,
142 GstObject * parent, GstQuery * query);
144 static gboolean gst_type_find_element_sink_event (GstPad * pad,
145 GstObject * parent, GstEvent * event);
146 static gboolean gst_type_find_element_setcaps (GstTypeFindElement * typefind,
148 static GstFlowReturn gst_type_find_element_chain (GstPad * sinkpad,
149 GstObject * parent, GstBuffer * buffer);
150 static GstFlowReturn gst_type_find_element_getrange (GstPad * srcpad,
151 GstObject * parent, guint64 offset, guint length, GstBuffer ** buffer);
153 static GstStateChangeReturn
154 gst_type_find_element_change_state (GstElement * element,
155 GstStateChange transition);
156 static gboolean gst_type_find_element_activate_sink (GstPad * pad,
158 static gboolean gst_type_find_element_activate_sink_mode (GstPad * pad,
159 GstObject * parent, GstPadMode mode, gboolean active);
160 static gboolean gst_type_find_element_activate_src_mode (GstPad * pad,
161 GstObject * parent, GstPadMode mode, gboolean active);
163 gst_type_find_element_chain_do_typefinding (GstTypeFindElement * typefind,
164 gboolean check_avail, gboolean at_eos);
165 static void gst_type_find_element_send_cached_events (GstTypeFindElement *
168 static void gst_type_find_element_loop (GstPad * pad);
170 static guint gst_type_find_element_signals[LAST_SIGNAL] = { 0 };
173 gst_type_find_element_have_type (GstTypeFindElement * typefind,
174 guint probability, GstCaps * caps)
178 g_assert (caps != NULL);
180 GST_INFO_OBJECT (typefind, "found caps %" GST_PTR_FORMAT ", probability=%u",
183 /* Do nothing if downstream is pulling from us */
184 if (GST_PAD_MODE (typefind->src) == GST_PAD_MODE_PULL)
187 GST_OBJECT_LOCK (typefind);
189 /* Now actually send the CAPS event downstream.
191 * Try to directly send the CAPS event downstream that we created in
192 * gst_type_find_element_emit_have_type() if it is still there, instead
193 * of creating a new one. No need to create an equivalent one, replacing
194 * it in the sticky event list and possibly causing renegotiation
196 event = gst_pad_get_sticky_event (typefind->src, GST_EVENT_CAPS, 0);
200 gst_event_parse_caps (event, &event_caps);
201 if (caps != event_caps) {
202 gst_event_unref (event);
203 event = gst_event_new_caps (caps);
206 event = gst_event_new_caps (caps);
209 GST_OBJECT_UNLOCK (typefind);
211 gst_pad_push_event (typefind->src, event);
215 gst_type_find_element_emit_have_type (GstTypeFindElement * typefind,
216 guint probability, GstCaps * caps)
220 /* Update caps field immediatly so that caps queries and properties can be
221 * honored in all "have-type" signal handlers.
223 GST_OBJECT_LOCK (typefind);
225 gst_caps_unref (typefind->caps);
226 typefind->caps = gst_caps_ref (caps);
227 GST_OBJECT_UNLOCK (typefind);
229 /* Only store the caps event at this point. We give signal handlers
230 * the chance to look at the caps before they are sent downstream.
231 * They are only forwarded downstream later in the default signal
232 * handler after all application signal handlers
234 event = gst_event_new_caps (caps);
235 gst_pad_store_sticky_event (typefind->src, event);
236 gst_event_unref (event);
238 g_signal_emit (typefind, gst_type_find_element_signals[HAVE_TYPE], 0,
243 gst_type_find_element_class_init (GstTypeFindElementClass * typefind_class)
245 GObjectClass *gobject_class = G_OBJECT_CLASS (typefind_class);
246 GstElementClass *gstelement_class = GST_ELEMENT_CLASS (typefind_class);
248 gobject_class->set_property = gst_type_find_element_set_property;
249 gobject_class->get_property = gst_type_find_element_get_property;
250 gobject_class->dispose = gst_type_find_element_dispose;
252 g_object_class_install_property (gobject_class, PROP_CAPS,
253 g_param_spec_boxed ("caps", _("caps"),
254 _("detected capabilities in stream"), GST_TYPE_CAPS,
255 G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
256 g_object_class_install_property (gobject_class, PROP_MINIMUM,
257 g_param_spec_uint ("minimum", _("minimum"),
258 "minimum probability required to accept caps", GST_TYPE_FIND_MINIMUM,
259 GST_TYPE_FIND_MAXIMUM, GST_TYPE_FIND_MINIMUM,
260 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
261 g_object_class_install_property (gobject_class, PROP_FORCE_CAPS,
262 g_param_spec_boxed ("force-caps", _("force caps"),
263 _("force caps without doing a typefind"), GST_TYPE_CAPS,
264 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
266 * GstTypeFindElement::have-type:
267 * @typefind: the typefind instance
268 * @probability: the probability of the type found
269 * @caps: the caps of the type found
271 * This signal gets emitted when the type and its probability has
274 gst_type_find_element_signals[HAVE_TYPE] = g_signal_new ("have-type",
275 G_TYPE_FROM_CLASS (typefind_class), G_SIGNAL_RUN_LAST,
276 G_STRUCT_OFFSET (GstTypeFindElementClass, have_type), NULL, NULL,
277 g_cclosure_marshal_generic, G_TYPE_NONE, 2,
278 G_TYPE_UINT, GST_TYPE_CAPS | G_SIGNAL_TYPE_STATIC_SCOPE);
280 typefind_class->have_type =
281 GST_DEBUG_FUNCPTR (gst_type_find_element_have_type);
283 gst_element_class_set_static_metadata (gstelement_class,
286 "Finds the media type of a stream",
287 "Benjamin Otte <in7y118@public.uni-hamburg.de>");
288 gst_element_class_add_static_pad_template (gstelement_class,
289 &type_find_element_src_template);
290 gst_element_class_add_static_pad_template (gstelement_class,
291 &type_find_element_sink_template);
293 gstelement_class->change_state =
294 GST_DEBUG_FUNCPTR (gst_type_find_element_change_state);
298 gst_type_find_element_init (GstTypeFindElement * typefind)
302 gst_pad_new_from_static_template (&type_find_element_sink_template,
305 gst_pad_set_activate_function (typefind->sink,
306 GST_DEBUG_FUNCPTR (gst_type_find_element_activate_sink));
307 gst_pad_set_activatemode_function (typefind->sink,
308 GST_DEBUG_FUNCPTR (gst_type_find_element_activate_sink_mode));
309 gst_pad_set_chain_function (typefind->sink,
310 GST_DEBUG_FUNCPTR (gst_type_find_element_chain));
311 gst_pad_set_event_function (typefind->sink,
312 GST_DEBUG_FUNCPTR (gst_type_find_element_sink_event));
313 GST_PAD_SET_PROXY_ALLOCATION (typefind->sink);
314 gst_element_add_pad (GST_ELEMENT (typefind), typefind->sink);
318 gst_pad_new_from_static_template (&type_find_element_src_template, "src");
320 gst_pad_set_activatemode_function (typefind->src,
321 GST_DEBUG_FUNCPTR (gst_type_find_element_activate_src_mode));
322 gst_pad_set_getrange_function (typefind->src,
323 GST_DEBUG_FUNCPTR (gst_type_find_element_getrange));
324 gst_pad_set_event_function (typefind->src,
325 GST_DEBUG_FUNCPTR (gst_type_find_element_src_event));
326 gst_pad_set_query_function (typefind->src,
327 GST_DEBUG_FUNCPTR (gst_type_find_handle_src_query));
328 gst_pad_use_fixed_caps (typefind->src);
329 gst_element_add_pad (GST_ELEMENT (typefind), typefind->src);
331 typefind->mode = MODE_TYPEFIND;
332 typefind->caps = NULL;
333 typefind->min_probability = 1;
335 typefind->adapter = gst_adapter_new ();
339 gst_type_find_element_dispose (GObject * object)
341 GstTypeFindElement *typefind = GST_TYPE_FIND_ELEMENT (object);
343 if (typefind->adapter) {
344 g_object_unref (typefind->adapter);
345 typefind->adapter = NULL;
348 if (typefind->force_caps) {
349 gst_caps_unref (typefind->force_caps);
350 typefind->force_caps = NULL;
353 G_OBJECT_CLASS (parent_class)->dispose (object);
357 gst_type_find_element_set_property (GObject * object, guint prop_id,
358 const GValue * value, GParamSpec * pspec)
360 GstTypeFindElement *typefind;
362 typefind = GST_TYPE_FIND_ELEMENT (object);
366 typefind->min_probability = g_value_get_uint (value);
368 case PROP_FORCE_CAPS:
369 GST_OBJECT_LOCK (typefind);
370 if (typefind->force_caps)
371 gst_caps_unref (typefind->force_caps);
372 typefind->force_caps = g_value_dup_boxed (value);
373 GST_OBJECT_UNLOCK (typefind);
376 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
382 gst_type_find_element_get_property (GObject * object, guint prop_id,
383 GValue * value, GParamSpec * pspec)
385 GstTypeFindElement *typefind;
387 typefind = GST_TYPE_FIND_ELEMENT (object);
391 GST_OBJECT_LOCK (typefind);
392 g_value_set_boxed (value, typefind->caps);
393 GST_OBJECT_UNLOCK (typefind);
396 g_value_set_uint (value, typefind->min_probability);
398 case PROP_FORCE_CAPS:
399 GST_OBJECT_LOCK (typefind);
400 g_value_set_boxed (value, typefind->force_caps);
401 GST_OBJECT_UNLOCK (typefind);
404 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
410 gst_type_find_handle_src_query (GstPad * pad, GstObject * parent,
413 GstTypeFindElement *typefind;
414 gboolean res = FALSE;
416 typefind = GST_TYPE_FIND_ELEMENT (parent);
417 GST_DEBUG_OBJECT (typefind, "Handling src query %s",
418 GST_QUERY_TYPE_NAME (query));
420 switch (GST_QUERY_TYPE (query)) {
421 case GST_QUERY_SCHEDULING:
422 /* FIXME, filter out the scheduling modes that we understand */
423 res = gst_pad_peer_query (typefind->sink, query);
427 GST_DEBUG_OBJECT (typefind,
428 "Got caps query, our caps are %" GST_PTR_FORMAT, typefind->caps);
430 /* We can hijack caps query if we typefind already */
431 if (typefind->caps) {
432 gst_query_set_caps_result (query, typefind->caps);
435 res = gst_pad_peer_query (typefind->sink, query);
439 case GST_QUERY_POSITION:
444 if (!(res = gst_pad_peer_query (typefind->sink, query)))
447 gst_query_parse_position (query, &format, &peer_pos);
449 GST_OBJECT_LOCK (typefind);
450 /* FIXME: this code assumes that there's no discont in the queue */
452 case GST_FORMAT_BYTES:
453 peer_pos -= gst_adapter_available (typefind->adapter);
454 if (peer_pos < 0) /* Clamp result to 0 */
461 GST_OBJECT_UNLOCK (typefind);
462 gst_query_set_position (query, format, peer_pos);
466 res = gst_pad_query_default (pad, parent, query);
474 gst_type_find_element_seek (GstTypeFindElement * typefind, GstEvent * event)
477 GstSeekType start_type, stop_type;
482 GstSegment seeksegment = { 0, };
484 gst_event_parse_seek (event, &rate, &format, &flags, &start_type, &start,
487 /* we can only seek on bytes */
488 if (format != GST_FORMAT_BYTES) {
489 GST_DEBUG_OBJECT (typefind, "Can only seek on BYTES");
493 /* copy segment, we need this because we still need the old
494 * segment when we close the current segment. */
495 memcpy (&seeksegment, &typefind->segment, sizeof (GstSegment));
497 GST_DEBUG_OBJECT (typefind, "configuring seek");
498 gst_segment_do_seek (&seeksegment, rate, format, flags,
499 start_type, start, stop_type, stop, NULL);
501 flush = ! !(flags & GST_SEEK_FLAG_FLUSH);
503 GST_DEBUG_OBJECT (typefind, "New segment %" GST_SEGMENT_FORMAT, &seeksegment);
506 GST_DEBUG_OBJECT (typefind, "Starting flush");
507 gst_pad_push_event (typefind->sink, gst_event_new_flush_start ());
508 gst_pad_push_event (typefind->src, gst_event_new_flush_start ());
510 GST_DEBUG_OBJECT (typefind, "Non-flushing seek, pausing task");
511 gst_pad_pause_task (typefind->sink);
514 /* now grab the stream lock so that streaming cannot continue, for
515 * non flushing seeks when the element is in PAUSED this could block
517 GST_DEBUG_OBJECT (typefind, "Waiting for streaming to stop");
518 GST_PAD_STREAM_LOCK (typefind->sink);
521 GST_DEBUG_OBJECT (typefind, "Stopping flush");
522 gst_pad_push_event (typefind->sink, gst_event_new_flush_stop (TRUE));
523 gst_pad_push_event (typefind->src, gst_event_new_flush_stop (TRUE));
526 /* now update the real segment info */
527 GST_DEBUG_OBJECT (typefind, "Committing new seek segment");
528 memcpy (&typefind->segment, &seeksegment, sizeof (GstSegment));
529 typefind->offset = typefind->segment.start;
531 /* notify start of new segment */
532 if (typefind->segment.flags & GST_SEGMENT_FLAG_SEGMENT) {
535 msg = gst_message_new_segment_start (GST_OBJECT (typefind),
536 GST_FORMAT_BYTES, typefind->segment.start);
537 gst_element_post_message (GST_ELEMENT (typefind), msg);
540 typefind->need_segment = TRUE;
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 if (typefind->mode != MODE_NORMAL) {
561 /* need to do more? */
562 GST_LOG_OBJECT (typefind, "Still typefinding. Not passing event upstream");
563 gst_event_unref (event);
567 /* Only handle seeks here if driving the pipeline */
568 if (typefind->segment.format != GST_FORMAT_UNDEFINED &&
569 GST_EVENT_TYPE (event) == GST_EVENT_SEEK) {
570 result = gst_type_find_element_seek (typefind, event);
571 gst_event_unref (event);
574 return gst_pad_push_event (typefind->sink, event);
579 start_typefinding (GstTypeFindElement * typefind)
581 GST_DEBUG_OBJECT (typefind, "starting typefinding");
583 GST_OBJECT_LOCK (typefind);
585 gst_caps_replace (&typefind->caps, NULL);
586 typefind->initial_offset = GST_BUFFER_OFFSET_NONE;
587 GST_OBJECT_UNLOCK (typefind);
589 typefind->mode = MODE_TYPEFIND;
593 stop_typefinding (GstTypeFindElement * typefind)
596 gboolean push_cached_buffers;
599 GstClockTime pts, dts;
601 gst_element_get_state (GST_ELEMENT (typefind), &state, NULL, 0);
603 push_cached_buffers = (state >= GST_STATE_PAUSED && typefind->caps);
605 GST_DEBUG_OBJECT (typefind, "stopping typefinding%s",
606 push_cached_buffers ? " and pushing cached events and buffers" : "");
608 typefind->mode = MODE_NORMAL;
609 if (push_cached_buffers)
610 gst_type_find_element_send_cached_events (typefind);
612 GST_OBJECT_LOCK (typefind);
613 avail = gst_adapter_available (typefind->adapter);
617 pts = gst_adapter_prev_pts (typefind->adapter, NULL);
618 dts = gst_adapter_prev_dts (typefind->adapter, NULL);
619 buffer = gst_adapter_take_buffer (typefind->adapter, avail);
620 GST_BUFFER_PTS (buffer) = pts;
621 GST_BUFFER_DTS (buffer) = dts;
622 GST_BUFFER_OFFSET (buffer) = typefind->initial_offset;
623 GST_OBJECT_UNLOCK (typefind);
625 if (!push_cached_buffers) {
626 gst_buffer_unref (buffer);
628 GstPad *peer = gst_pad_get_peer (typefind->src);
630 /* make sure the user gets a meaningful error message in this case,
631 * which is not a core bug or bug of any kind (as the default error
632 * message emitted by gstpad.c otherwise would make you think) */
633 if (peer && GST_PAD_CHAINFUNC (peer) == NULL) {
634 GST_DEBUG_OBJECT (typefind, "upstream only supports push mode, while "
635 "downstream element only works in pull mode, erroring out");
636 GST_ELEMENT_ERROR (typefind, STREAM, FAILED,
637 ("%s cannot work in push mode. The operation is not supported "
638 "with this source element or protocol.",
639 G_OBJECT_TYPE_NAME (GST_PAD_PARENT (peer))),
640 ("Downstream pad %s:%s has no chainfunction, and the upstream "
641 "element does not support pull mode", GST_DEBUG_PAD_NAME (peer)));
642 typefind->mode = MODE_ERROR; /* make the chain function error out */
643 gst_buffer_unref (buffer);
645 gst_pad_push (typefind->src, buffer);
648 gst_object_unref (peer);
655 GST_DEBUG_OBJECT (typefind, "we have no data to typefind");
656 GST_OBJECT_UNLOCK (typefind);
662 gst_type_find_element_sink_event (GstPad * pad, GstObject * parent,
665 gboolean res = FALSE;
666 GstTypeFindElement *typefind = GST_TYPE_FIND_ELEMENT (parent);
668 GST_DEBUG_OBJECT (typefind, "got %s event in mode %d",
669 GST_EVENT_TYPE_NAME (event), typefind->mode);
671 switch (typefind->mode) {
673 switch (GST_EVENT_TYPE (event)) {
678 /* Parse and push out our caps and data */
679 gst_event_parse_caps (event, &caps);
680 res = gst_type_find_element_setcaps (typefind, caps);
682 gst_event_unref (event);
687 GST_FIXME_OBJECT (typefind,
688 "GAP events during typefinding not handled properly");
690 /* FIXME: These would need to be inserted in the stream at
691 * the right position between buffers, but we combine all
692 * buffers with a GstAdapter. Drop the GAP event for now,
693 * which will only cause an implicit GAP between buffers.
695 gst_event_unref (event);
701 GST_INFO_OBJECT (typefind, "Got EOS and no type found yet");
702 gst_type_find_element_chain_do_typefinding (typefind, FALSE, TRUE);
704 res = gst_pad_push_event (typefind->src, event);
707 case GST_EVENT_FLUSH_STOP:{
710 GST_OBJECT_LOCK (typefind);
712 for (l = typefind->cached_events; l; l = l->next) {
713 if (GST_EVENT_IS_STICKY (l->data) &&
714 GST_EVENT_TYPE (l->data) != GST_EVENT_SEGMENT &&
715 GST_EVENT_TYPE (l->data) != GST_EVENT_EOS) {
716 gst_pad_store_sticky_event (typefind->src, l->data);
718 gst_event_unref (l->data);
721 g_list_free (typefind->cached_events);
722 typefind->cached_events = NULL;
723 gst_adapter_clear (typefind->adapter);
724 GST_OBJECT_UNLOCK (typefind);
727 case GST_EVENT_FLUSH_START:
728 res = gst_pad_push_event (typefind->src, event);
731 /* Forward events that would happen before the caps event
732 * directly instead of storing them. There's no reason not
733 * to send them directly and we should only store events
734 * for later sending that would need to come after the caps
736 if (GST_EVENT_TYPE (event) < GST_EVENT_CAPS) {
737 res = gst_pad_push_event (typefind->src, event);
739 GST_DEBUG_OBJECT (typefind, "Saving %s event to send later",
740 GST_EVENT_TYPE_NAME (event));
741 GST_OBJECT_LOCK (typefind);
742 typefind->cached_events =
743 g_list_append (typefind->cached_events, event);
744 GST_OBJECT_UNLOCK (typefind);
751 res = gst_pad_push_event (typefind->src, event);
756 g_assert_not_reached ();
762 gst_type_find_element_send_cached_events (GstTypeFindElement * typefind)
764 GList *l, *cached_events;
766 GST_OBJECT_LOCK (typefind);
767 cached_events = typefind->cached_events;
768 typefind->cached_events = NULL;
769 GST_OBJECT_UNLOCK (typefind);
771 for (l = cached_events; l != NULL; l = l->next) {
772 GstEvent *event = GST_EVENT (l->data);
774 GST_DEBUG_OBJECT (typefind, "sending cached %s event",
775 GST_EVENT_TYPE_NAME (event));
776 gst_pad_push_event (typefind->src, event);
778 g_list_free (cached_events);
782 gst_type_find_element_setcaps (GstTypeFindElement * typefind, GstCaps * caps)
784 /* don't operate on ANY caps */
785 if (gst_caps_is_any (caps))
788 /* Set to MODE_NORMAL before emitting have-type, in case it triggers a seek */
789 typefind->mode = MODE_NORMAL;
790 gst_type_find_element_emit_have_type (typefind, GST_TYPE_FIND_MAXIMUM, caps);
792 /* Shortcircuit typefinding if we get caps */
793 GST_DEBUG_OBJECT (typefind, "Skipping typefinding, using caps from "
794 "upstream: %" GST_PTR_FORMAT, caps);
796 stop_typefinding (typefind);
802 gst_type_find_get_extension (GstTypeFindElement * typefind, GstPad * pad)
809 query = gst_query_new_uri ();
811 /* try getting the caps with an uri query and from the extension */
812 if (!gst_pad_peer_query (pad, query))
813 goto peer_query_failed;
815 gst_query_parse_uri (query, &uri);
819 GST_DEBUG_OBJECT (typefind, "finding extension of %s", uri);
821 /* find the extension on the uri, this is everything after a '.' */
826 if (uri[find] == '.')
833 result = g_strdup (&uri[find + 1]);
835 GST_DEBUG_OBJECT (typefind, "found extension %s", result);
836 gst_query_unref (query);
844 GST_WARNING_OBJECT (typefind, "failed to query peer uri");
845 gst_query_unref (query);
850 GST_WARNING_OBJECT (typefind, "could not parse the peer uri");
851 gst_query_unref (query);
856 GST_WARNING_OBJECT (typefind, "could not find uri extension in %s", uri);
857 gst_query_unref (query);
864 gst_type_find_guess_by_extension (GstTypeFindElement * typefind, GstPad * pad,
865 GstTypeFindProbability * probability)
870 ext = gst_type_find_get_extension (typefind, pad);
874 caps = gst_type_find_helper_for_extension (GST_OBJECT_CAST (typefind), ext);
876 *probability = GST_TYPE_FIND_MAXIMUM;
884 gst_type_find_element_chain (GstPad * pad, GstObject * parent,
887 GstTypeFindElement *typefind;
888 GstFlowReturn res = GST_FLOW_OK;
890 typefind = GST_TYPE_FIND_ELEMENT (parent);
892 GST_LOG_OBJECT (typefind, "handling buffer in mode %d", typefind->mode);
894 switch (typefind->mode) {
896 /* we should already have called GST_ELEMENT_ERROR */
897 return GST_FLOW_ERROR;
899 /* don't take object lock as typefind->caps should not change anymore */
900 return gst_pad_push (typefind->src, buffer);
903 GST_OBJECT_LOCK (typefind);
904 if (typefind->initial_offset == GST_BUFFER_OFFSET_NONE)
905 typefind->initial_offset = GST_BUFFER_OFFSET (buffer);
906 gst_adapter_push (typefind->adapter, buffer);
907 GST_OBJECT_UNLOCK (typefind);
909 res = gst_type_find_element_chain_do_typefinding (typefind, TRUE, FALSE);
911 if (typefind->mode == MODE_ERROR)
912 res = GST_FLOW_ERROR;
917 g_assert_not_reached ();
918 return GST_FLOW_ERROR;
925 gst_type_find_element_chain_do_typefinding (GstTypeFindElement * typefind,
926 gboolean check_avail, gboolean at_eos)
928 GstTypeFindProbability probability;
929 GstCaps *caps = NULL;
932 gboolean have_min, have_max;
934 GST_OBJECT_LOCK (typefind);
935 if (typefind->force_caps) {
936 caps = gst_caps_ref (typefind->force_caps);
937 probability = GST_TYPE_FIND_MAXIMUM;
941 avail = gst_adapter_available (typefind->adapter);
944 have_min = avail >= TYPE_FIND_MIN_SIZE;
945 have_max = avail >= TYPE_FIND_MAX_SIZE;
947 have_min = avail > 0;
952 goto not_enough_data;
954 /* map all available data */
955 data = gst_adapter_map (typefind->adapter, avail);
956 caps = gst_type_find_helper_for_data (GST_OBJECT (typefind),
957 data, avail, &probability);
958 gst_adapter_unmap (typefind->adapter);
960 if (caps == NULL && have_max)
962 else if (caps == NULL)
966 if (probability < typefind->min_probability)
967 goto low_probability;
970 GST_OBJECT_UNLOCK (typefind);
972 /* probability is good enough too, so let's make it known ... emiting this
973 * signal calls our object handler which sets the caps. */
974 /* Set to MODE_NORMAL before emitting have-type, in case it triggers a seek */
975 typefind->mode = MODE_NORMAL;
976 gst_type_find_element_emit_have_type (typefind, probability, caps);
978 /* .. and send out the accumulated data */
979 stop_typefinding (typefind);
980 gst_caps_unref (caps);
986 GST_OBJECT_UNLOCK (typefind);
989 GST_ELEMENT_ERROR (typefind, STREAM, TYPE_NOT_FOUND,
990 (_("Stream doesn't contain enough data.")),
991 ("Can't typefind stream"));
992 return GST_FLOW_ERROR;
994 GST_DEBUG_OBJECT (typefind, "not enough data for typefinding yet "
995 "(%" G_GSIZE_FORMAT " bytes)", avail);
1001 GST_OBJECT_UNLOCK (typefind);
1002 GST_ELEMENT_ERROR (typefind, STREAM, TYPE_NOT_FOUND, (NULL), (NULL));
1003 stop_typefinding (typefind);
1004 return GST_FLOW_ERROR;
1008 GST_OBJECT_UNLOCK (typefind);
1011 GST_ELEMENT_ERROR (typefind, STREAM, TYPE_NOT_FOUND,
1012 (_("Stream doesn't contain enough data.")),
1013 ("Can't typefind stream"));
1014 return GST_FLOW_ERROR;
1016 GST_DEBUG_OBJECT (typefind,
1017 "no caps found with %" G_GSIZE_FORMAT " bytes of data, "
1018 "waiting for more data", avail);
1024 GST_DEBUG_OBJECT (typefind, "found caps %" GST_PTR_FORMAT ", but "
1025 "probability is %u which is lower than the required minimum of %u",
1026 caps, probability, typefind->min_probability);
1028 gst_caps_unref (caps);
1033 GST_OBJECT_UNLOCK (typefind);
1034 GST_DEBUG_OBJECT (typefind, "waiting for more data to try again");
1039 static GstFlowReturn
1040 gst_type_find_element_getrange (GstPad * srcpad, GstObject * parent,
1041 guint64 offset, guint length, GstBuffer ** buffer)
1043 GstTypeFindElement *typefind;
1046 typefind = GST_TYPE_FIND_ELEMENT (parent);
1048 ret = gst_pad_pull_range (typefind->sink, offset, length, buffer);
1054 gst_type_find_element_activate_src_mode (GstPad * pad, GstObject * parent,
1055 GstPadMode mode, gboolean active)
1058 GstTypeFindElement *typefind;
1060 typefind = GST_TYPE_FIND_ELEMENT (parent);
1063 case GST_PAD_MODE_PULL:
1064 /* make sure our task stops pushing, we can't call _stop here because this
1065 * activation might happen from the streaming thread. */
1066 gst_pad_pause_task (typefind->sink);
1067 res = gst_pad_activate_mode (typefind->sink, mode, active);
1077 gst_type_find_element_loop (GstPad * pad)
1079 GstTypeFindElement *typefind;
1080 GstFlowReturn ret = GST_FLOW_OK;
1082 typefind = GST_TYPE_FIND_ELEMENT (GST_PAD_PARENT (pad));
1084 if (typefind->need_stream_start) {
1088 stream_id = gst_pad_create_stream_id (typefind->src,
1089 GST_ELEMENT_CAST (typefind), NULL);
1091 GST_DEBUG_OBJECT (typefind, "Pushing STREAM_START");
1092 event = gst_event_new_stream_start (stream_id);
1093 gst_event_set_group_id (event, gst_util_group_id_next ());
1094 gst_pad_push_event (typefind->src, event);
1096 typefind->need_stream_start = FALSE;
1100 if (typefind->mode == MODE_TYPEFIND) {
1101 GstPad *peer = NULL;
1102 GstCaps *found_caps = NULL;
1103 GstTypeFindProbability probability = GST_TYPE_FIND_NONE;
1105 GST_DEBUG_OBJECT (typefind, "find type in pull mode");
1107 GST_OBJECT_LOCK (typefind);
1108 if (typefind->force_caps) {
1109 found_caps = gst_caps_ref (typefind->force_caps);
1110 probability = GST_TYPE_FIND_MAXIMUM;
1112 GST_OBJECT_UNLOCK (typefind);
1115 peer = gst_pad_get_peer (pad);
1120 if (!gst_pad_query_duration (peer, GST_FORMAT_BYTES, &size)) {
1121 GST_WARNING_OBJECT (typefind, "Could not query upstream length!");
1122 gst_object_unref (peer);
1124 ret = GST_FLOW_ERROR;
1128 /* the size if 0, we cannot continue */
1130 /* keep message in sync with message in sink event handler */
1131 GST_ELEMENT_ERROR (typefind, STREAM, TYPE_NOT_FOUND,
1132 (_("Stream contains no data.")), ("Can't typefind empty stream"));
1133 gst_object_unref (peer);
1134 ret = GST_FLOW_ERROR;
1137 ext = gst_type_find_get_extension (typefind, pad);
1140 gst_type_find_helper_get_range (GST_OBJECT_CAST (peer),
1141 GST_OBJECT_PARENT (peer),
1142 (GstTypeFindHelperGetRangeFunction) (GST_PAD_GETRANGEFUNC (peer)),
1143 (guint64) size, ext, &probability);
1146 GST_DEBUG ("Found caps %" GST_PTR_FORMAT, found_caps);
1148 gst_object_unref (peer);
1152 if (!found_caps || probability < typefind->min_probability) {
1153 GST_DEBUG ("Trying to guess using extension");
1154 gst_caps_replace (&found_caps, NULL);
1156 gst_type_find_guess_by_extension (typefind, pad, &probability);
1159 if (!found_caps || probability < typefind->min_probability) {
1160 GST_ELEMENT_ERROR (typefind, STREAM, TYPE_NOT_FOUND, (NULL), (NULL));
1161 gst_caps_replace (&found_caps, NULL);
1162 ret = GST_FLOW_ERROR;
1166 GST_DEBUG ("Emiting found caps %" GST_PTR_FORMAT, found_caps);
1167 /* Set to MODE_NORMAL before emitting have-type, in case it triggers a seek */
1168 typefind->mode = MODE_NORMAL;
1169 gst_type_find_element_emit_have_type (typefind, probability, found_caps);
1170 gst_caps_unref (found_caps);
1171 } else if (typefind->mode == MODE_NORMAL) {
1172 GstBuffer *outbuf = NULL;
1174 if (typefind->need_segment) {
1175 typefind->need_segment = FALSE;
1176 gst_pad_push_event (typefind->src,
1177 gst_event_new_segment (&typefind->segment));
1180 /* Pull 4k blocks and send downstream */
1181 ret = gst_pad_pull_range (typefind->sink, typefind->offset, 4096, &outbuf);
1182 if (ret != GST_FLOW_OK)
1185 typefind->offset += gst_buffer_get_size (outbuf);
1187 ret = gst_pad_push (typefind->src, outbuf);
1188 if (ret != GST_FLOW_OK)
1192 ret = GST_FLOW_ERROR;
1200 const gchar *reason = gst_flow_get_name (ret);
1201 gboolean push_eos = FALSE;
1203 GST_LOG_OBJECT (typefind, "pausing task, reason %s", reason);
1204 gst_pad_pause_task (typefind->sink);
1206 if (ret == GST_FLOW_EOS) {
1207 /* perform EOS logic */
1209 if (typefind->segment.flags & GST_SEGMENT_FLAG_SEGMENT) {
1212 /* for segment playback we need to post when (in stream time)
1213 * we stopped, this is either stop (when set) or the duration. */
1214 if ((stop = typefind->segment.stop) == -1)
1215 stop = typefind->offset;
1217 GST_LOG_OBJECT (typefind, "Sending segment done, at end of segment");
1218 gst_element_post_message (GST_ELEMENT (typefind),
1219 gst_message_new_segment_done (GST_OBJECT (typefind),
1220 GST_FORMAT_BYTES, stop));
1221 gst_pad_push_event (typefind->src,
1222 gst_event_new_segment_done (GST_FORMAT_BYTES, stop));
1226 } else if (ret == GST_FLOW_NOT_LINKED || ret < GST_FLOW_EOS) {
1227 /* for fatal errors we post an error message */
1228 GST_ELEMENT_FLOW_ERROR (typefind, ret);
1232 /* send EOS, and prevent hanging if no streams yet */
1233 GST_LOG_OBJECT (typefind, "Sending EOS, at end of stream");
1234 gst_pad_push_event (typefind->src, gst_event_new_eos ());
1241 gst_type_find_element_activate_sink_mode (GstPad * pad, GstObject * parent,
1242 GstPadMode mode, gboolean active)
1245 GstTypeFindElement *typefind;
1247 typefind = GST_TYPE_FIND_ELEMENT (parent);
1250 case GST_PAD_MODE_PULL:
1252 gst_segment_init (&typefind->segment, GST_FORMAT_BYTES);
1253 typefind->need_segment = TRUE;
1254 typefind->need_stream_start = TRUE;
1255 typefind->offset = 0;
1258 res = gst_pad_stop_task (pad);
1259 gst_segment_init (&typefind->segment, GST_FORMAT_UNDEFINED);
1262 case GST_PAD_MODE_PUSH:
1264 gst_segment_init (&typefind->segment, GST_FORMAT_UNDEFINED);
1265 start_typefinding (typefind);
1267 stop_typefinding (typefind);
1268 gst_segment_init (&typefind->segment, GST_FORMAT_UNDEFINED);
1280 gst_type_find_element_activate_sink (GstPad * pad, GstObject * parent)
1285 query = gst_query_new_scheduling ();
1287 if (!gst_pad_peer_query (pad, query)) {
1288 gst_query_unref (query);
1292 pull_mode = gst_query_has_scheduling_mode_with_flags (query,
1293 GST_PAD_MODE_PULL, GST_SCHEDULING_FLAG_SEEKABLE);
1295 gst_query_unref (query);
1300 if (!gst_pad_activate_mode (pad, GST_PAD_MODE_PULL, TRUE))
1303 /* only start our task if we ourselves decide to start in pull mode */
1304 return gst_pad_start_task (pad, (GstTaskFunction) gst_type_find_element_loop,
1309 return gst_pad_activate_mode (pad, GST_PAD_MODE_PUSH, TRUE);
1313 static GstStateChangeReturn
1314 gst_type_find_element_change_state (GstElement * element,
1315 GstStateChange transition)
1317 GstStateChangeReturn ret;
1318 GstTypeFindElement *typefind;
1320 typefind = GST_TYPE_FIND_ELEMENT (element);
1323 ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
1325 switch (transition) {
1326 case GST_STATE_CHANGE_PAUSED_TO_READY:
1327 case GST_STATE_CHANGE_READY_TO_NULL:
1328 GST_OBJECT_LOCK (typefind);
1329 gst_caps_replace (&typefind->caps, NULL);
1331 g_list_foreach (typefind->cached_events,
1332 (GFunc) gst_mini_object_unref, NULL);
1333 g_list_free (typefind->cached_events);
1334 typefind->cached_events = NULL;
1335 typefind->mode = MODE_TYPEFIND;
1336 GST_OBJECT_UNLOCK (typefind);