2 * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
3 * 2005 Wim Taymans <wim@fluendo.com>
4 * 2005 Andy Wingo <wingo@fluendo.com>
5 * 2005 Thomas Vander Stichele <thomas at apestaart dot org>
6 * 2008 Wim Taymans <wim.taymans@gmail.com>
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Library General Public
10 * License as published by the Free Software Foundation; either
11 * version 2 of the License, or (at your option) any later version.
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Library General Public License for more details.
18 * You should have received a copy of the GNU Library General Public
19 * License along with this library; if not, write to the
20 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
21 * Boston, MA 02111-1307, USA.
25 * SECTION:gstbasetransform
26 * @short_description: Base class for simple transform filters
27 * @see_also: #GstBaseSrc, #GstBaseSink
29 * This base class is for filter elements that process data.
33 * <listitem><para>one sinkpad and one srcpad</para></listitem>
35 * Possible formats on sink and source pad implemented
36 * with custom transform_caps function. By default uses
37 * same format on sink and source.
39 * <listitem><para>Handles state changes</para></listitem>
40 * <listitem><para>Does flushing</para></listitem>
41 * <listitem><para>Push mode</para></listitem>
43 * Pull mode if the sub-class transform can operate on arbitrary data
48 * <title>Use Cases</title>
52 * <itemizedlist><title>Passthrough mode</title>
54 * Element has no interest in modifying the buffer. It may want to inspect it,
55 * in which case the element should have a transform_ip function. If there
56 * is no transform_ip function in passthrough mode, the buffer is pushed
60 * On the GstBaseTransformClass is the passthrough_on_same_caps variable
61 * which will automatically set/unset passthrough based on whether the
62 * element negotiates the same caps on both pads.
65 * passthrough_on_same_caps on an element that doesn't implement a
66 * transform_caps function is useful for elements that only inspect data
71 * <title>Example elements</title>
72 * <listitem>Level</listitem>
73 * <listitem>Videoscale, audioconvert, ffmpegcolorspace, audioresample in
74 * certain modes.</listitem>
79 * <title>Modifications in-place - input buffer and output buffer are the
82 * The element must implement a transform_ip function.
85 * Output buffer size must <= input buffer size
88 * If the always_in_place flag is set, non-writable buffers will be copied
89 * and passed to the transform_ip function, otherwise a new buffer will be
90 * created and the transform function called.
93 * Incoming writable buffers will be passed to the transform_ip function
94 * immediately. </para></listitem>
96 * only implementing transform_ip and not transform implies always_in_place
101 * <title>Example elements</title>
102 * <listitem>Volume</listitem>
103 * <listitem>Audioconvert in certain modes (signed/unsigned
104 * conversion)</listitem>
105 * <listitem>ffmpegcolorspace in certain modes (endianness
106 * swapping)</listitem>
111 * <title>Modifications only to the caps/metadata of a buffer</title>
113 * The element does not require writable data, but non-writable buffers
114 * should be subbuffered so that the meta-information can be replaced.
117 * Elements wishing to operate in this mode should replace the
118 * prepare_output_buffer method to create subbuffers of the input buffer
119 * and set always_in_place to TRUE
123 * <title>Example elements</title>
124 * <listitem>Capsfilter when setting caps on outgoing buffers that have
126 * <listitem>identity when it is going to re-timestamp buffers by
127 * datarate.</listitem>
131 * <itemizedlist><title>Normal mode</title>
133 * always_in_place flag is not set, or there is no transform_ip function
136 * Element will receive an input buffer and output buffer to operate on.
139 * Output buffer is allocated by calling the prepare_output_buffer function.
143 * <title>Example elements</title>
144 * <listitem>Videoscale, ffmpegcolorspace, audioconvert when doing
145 * scaling/conversions</listitem>
149 * <itemizedlist><title>Special output buffer allocations</title>
151 * Elements which need to do special allocation of their output buffers
152 * other than what gst_buffer_pad_alloc allows should implement a
153 * prepare_output_buffer method, which calls the parent implementation and
154 * passes the newly allocated buffer.
158 * <title>Example elements</title>
159 * <listitem>efence</listitem>
166 * <title>Sub-class settable flags on GstBaseTransform</title>
170 * <itemizedlist><title>passthrough</title>
172 * Implies that in the current configuration, the sub-class is not
173 * interested in modifying the buffers.
176 * Elements which are always in passthrough mode whenever the same caps
177 * has been negotiated on both pads can set the class variable
178 * passthrough_on_same_caps to have this behaviour automatically.
183 * <itemizedlist><title>always_in_place</title>
185 * Determines whether a non-writable buffer will be copied before passing
186 * to the transform_ip function.
189 * Implied TRUE if no transform function is implemented.
192 * Implied FALSE if ONLY transform function is implemented.
208 #include "../../../gst/gst_private.h"
209 #include "../../../gst/gst-i18n-lib.h"
210 #include "gstbasetransform.h"
211 #include <gst/gstmarshal.h>
213 GST_DEBUG_CATEGORY_STATIC (gst_base_transform_debug);
214 #define GST_CAT_DEFAULT gst_base_transform_debug
216 /* BaseTransform signals and args */
223 #define DEFAULT_PROP_QOS FALSE
231 #define GST_BASE_TRANSFORM_GET_PRIVATE(obj) \
232 (G_TYPE_INSTANCE_GET_PRIVATE ((obj), GST_TYPE_BASE_TRANSFORM, GstBaseTransformPrivate))
234 struct _GstBaseTransformPrivate
236 /* QoS *//* with LOCK */
237 gboolean qos_enabled;
239 GstClockTime earliest_time;
240 /* previous buffer had a discont */
243 GstActivateMode pad_mode;
247 gboolean reconfigure;
253 GstClockTime position_out;
256 static GstElementClass *parent_class = NULL;
258 static void gst_base_transform_class_init (GstBaseTransformClass * klass);
259 static void gst_base_transform_init (GstBaseTransform * trans,
260 GstBaseTransformClass * klass);
261 static GstFlowReturn gst_base_transform_prepare_output_buffer (GstBaseTransform
262 * trans, GstBuffer * input, GstBuffer ** buf);
265 gst_base_transform_get_type (void)
267 static volatile gsize base_transform_type = 0;
269 if (g_once_init_enter (&base_transform_type)) {
271 static const GTypeInfo base_transform_info = {
272 sizeof (GstBaseTransformClass),
275 (GClassInitFunc) gst_base_transform_class_init,
278 sizeof (GstBaseTransform),
280 (GInstanceInitFunc) gst_base_transform_init,
283 _type = g_type_register_static (GST_TYPE_ELEMENT,
284 "GstBaseTransform", &base_transform_info, G_TYPE_FLAG_ABSTRACT);
285 g_once_init_leave (&base_transform_type, _type);
287 return base_transform_type;
290 static void gst_base_transform_finalize (GObject * object);
291 static void gst_base_transform_set_property (GObject * object, guint prop_id,
292 const GValue * value, GParamSpec * pspec);
293 static void gst_base_transform_get_property (GObject * object, guint prop_id,
294 GValue * value, GParamSpec * pspec);
295 static gboolean gst_base_transform_src_activate_pull (GstPad * pad,
297 static gboolean gst_base_transform_sink_activate_push (GstPad * pad,
299 static gboolean gst_base_transform_activate (GstBaseTransform * trans,
301 static gboolean gst_base_transform_get_unit_size (GstBaseTransform * trans,
302 GstCaps * caps, gsize * size);
304 static gboolean gst_base_transform_src_event (GstPad * pad, GstEvent * event);
305 static gboolean gst_base_transform_src_eventfunc (GstBaseTransform * trans,
307 static gboolean gst_base_transform_sink_event (GstPad * pad, GstEvent * event);
308 static gboolean gst_base_transform_sink_eventfunc (GstBaseTransform * trans,
310 static gboolean gst_base_transform_check_get_range (GstPad * pad);
311 static GstFlowReturn gst_base_transform_getrange (GstPad * pad, guint64 offset,
312 guint length, GstBuffer ** buffer);
313 static GstFlowReturn gst_base_transform_chain (GstPad * pad,
315 static GstCaps *gst_base_transform_getcaps (GstPad * pad);
316 static gboolean gst_base_transform_acceptcaps (GstPad * pad, GstCaps * caps);
317 static gboolean gst_base_transform_acceptcaps_default (GstBaseTransform * trans,
318 GstPadDirection direction, GstCaps * caps);
319 static gboolean gst_base_transform_setcaps (GstBaseTransform * trans,
320 GstPad * pad, GstCaps * caps, gboolean reconfigure);
321 static gboolean gst_base_transform_query (GstPad * pad, GstQuery ** query);
322 static const GstQueryType *gst_base_transform_query_type (GstPad * pad);
324 /* static guint gst_base_transform_signals[LAST_SIGNAL] = { 0 }; */
327 gst_base_transform_finalize (GObject * object)
329 GstBaseTransform *trans;
331 trans = GST_BASE_TRANSFORM (object);
333 g_mutex_free (trans->transform_lock);
335 G_OBJECT_CLASS (parent_class)->finalize (object);
339 gst_base_transform_class_init (GstBaseTransformClass * klass)
341 GObjectClass *gobject_class;
343 gobject_class = G_OBJECT_CLASS (klass);
345 GST_DEBUG_CATEGORY_INIT (gst_base_transform_debug, "basetransform", 0,
346 "basetransform element");
348 GST_DEBUG ("gst_base_transform_class_init");
350 g_type_class_add_private (klass, sizeof (GstBaseTransformPrivate));
352 parent_class = g_type_class_peek_parent (klass);
354 gobject_class->set_property = gst_base_transform_set_property;
355 gobject_class->get_property = gst_base_transform_get_property;
357 g_object_class_install_property (gobject_class, PROP_QOS,
358 g_param_spec_boolean ("qos", "QoS", "Handle Quality-of-Service events",
359 DEFAULT_PROP_QOS, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
361 gobject_class->finalize = gst_base_transform_finalize;
363 klass->passthrough_on_same_caps = FALSE;
364 klass->event = GST_DEBUG_FUNCPTR (gst_base_transform_sink_eventfunc);
365 klass->src_event = GST_DEBUG_FUNCPTR (gst_base_transform_src_eventfunc);
367 GST_DEBUG_FUNCPTR (gst_base_transform_acceptcaps_default);
371 gst_base_transform_init (GstBaseTransform * trans,
372 GstBaseTransformClass * bclass)
374 GstPadTemplate *pad_template;
376 GST_DEBUG ("gst_base_transform_init");
378 trans->priv = GST_BASE_TRANSFORM_GET_PRIVATE (trans);
381 gst_element_class_get_pad_template (GST_ELEMENT_CLASS (bclass), "sink");
382 g_return_if_fail (pad_template != NULL);
383 trans->sinkpad = gst_pad_new_from_template (pad_template, "sink");
384 gst_pad_set_getcaps_function (trans->sinkpad,
385 GST_DEBUG_FUNCPTR (gst_base_transform_getcaps));
386 gst_pad_set_acceptcaps_function (trans->sinkpad,
387 GST_DEBUG_FUNCPTR (gst_base_transform_acceptcaps));
388 gst_pad_set_event_function (trans->sinkpad,
389 GST_DEBUG_FUNCPTR (gst_base_transform_sink_event));
390 gst_pad_set_chain_function (trans->sinkpad,
391 GST_DEBUG_FUNCPTR (gst_base_transform_chain));
392 gst_pad_set_activatepush_function (trans->sinkpad,
393 GST_DEBUG_FUNCPTR (gst_base_transform_sink_activate_push));
394 gst_pad_set_query_function (trans->sinkpad,
395 GST_DEBUG_FUNCPTR (gst_base_transform_query));
396 gst_pad_set_query_type_function (trans->sinkpad,
397 GST_DEBUG_FUNCPTR (gst_base_transform_query_type));
398 gst_element_add_pad (GST_ELEMENT (trans), trans->sinkpad);
401 gst_element_class_get_pad_template (GST_ELEMENT_CLASS (bclass), "src");
402 g_return_if_fail (pad_template != NULL);
403 trans->srcpad = gst_pad_new_from_template (pad_template, "src");
404 gst_pad_set_getcaps_function (trans->srcpad,
405 GST_DEBUG_FUNCPTR (gst_base_transform_getcaps));
406 gst_pad_set_acceptcaps_function (trans->srcpad,
407 GST_DEBUG_FUNCPTR (gst_base_transform_acceptcaps));
408 gst_pad_set_event_function (trans->srcpad,
409 GST_DEBUG_FUNCPTR (gst_base_transform_src_event));
410 gst_pad_set_checkgetrange_function (trans->srcpad,
411 GST_DEBUG_FUNCPTR (gst_base_transform_check_get_range));
412 gst_pad_set_getrange_function (trans->srcpad,
413 GST_DEBUG_FUNCPTR (gst_base_transform_getrange));
414 gst_pad_set_activatepull_function (trans->srcpad,
415 GST_DEBUG_FUNCPTR (gst_base_transform_src_activate_pull));
416 gst_pad_set_query_function (trans->srcpad,
417 GST_DEBUG_FUNCPTR (gst_base_transform_query));
418 gst_pad_set_query_type_function (trans->srcpad,
419 GST_DEBUG_FUNCPTR (gst_base_transform_query_type));
420 gst_element_add_pad (GST_ELEMENT (trans), trans->srcpad);
422 trans->transform_lock = g_mutex_new ();
423 trans->pending_configure = FALSE;
424 trans->priv->qos_enabled = DEFAULT_PROP_QOS;
425 trans->cache_caps1 = NULL;
426 trans->cache_caps2 = NULL;
427 trans->priv->pad_mode = GST_ACTIVATE_NONE;
428 trans->priv->gap_aware = FALSE;
430 trans->passthrough = FALSE;
431 if (bclass->transform == NULL) {
432 /* If no transform function, always_in_place is TRUE */
433 GST_DEBUG_OBJECT (trans, "setting in_place TRUE");
434 trans->always_in_place = TRUE;
436 if (bclass->transform_ip == NULL) {
437 GST_DEBUG_OBJECT (trans, "setting passthrough TRUE");
438 trans->passthrough = TRUE;
442 trans->priv->processed = 0;
443 trans->priv->dropped = 0;
446 /* given @caps on the src or sink pad (given by @direction)
447 * calculate the possible caps on the other pad.
449 * Returns new caps, unref after usage.
452 gst_base_transform_transform_caps (GstBaseTransform * trans,
453 GstPadDirection direction, GstCaps * caps)
456 GstBaseTransformClass *klass;
461 klass = GST_BASE_TRANSFORM_GET_CLASS (trans);
463 /* if there is a custom transform function, use this */
464 if (klass->transform_caps) {
468 /* start with empty caps */
469 ret = gst_caps_new_empty ();
470 GST_DEBUG_OBJECT (trans, "transform caps (direction = %d)", direction);
472 if (gst_caps_is_any (caps)) {
473 /* for any caps we still have to call the transform function */
474 GST_DEBUG_OBJECT (trans, "from: ANY");
475 temp = klass->transform_caps (trans, direction, caps);
476 GST_DEBUG_OBJECT (trans, " to: %" GST_PTR_FORMAT, temp);
478 temp = gst_caps_make_writable (temp);
479 gst_caps_append (ret, temp);
481 gint n = gst_caps_get_size (caps);
482 /* we send caps with just one structure to the transform
483 * function as this is easier for the element */
484 for (i = 0; i < n; i++) {
487 nth = gst_caps_copy_nth (caps, i);
488 GST_LOG_OBJECT (trans, "from[%d]: %" GST_PTR_FORMAT, i, nth);
489 temp = klass->transform_caps (trans, direction, nth);
490 gst_caps_unref (nth);
491 GST_LOG_OBJECT (trans, " to[%d]: %" GST_PTR_FORMAT, i, temp);
493 temp = gst_caps_make_writable (temp);
495 /* here we need to only append those structures, that are not yet
496 * in there, we use the merge function for this */
497 gst_caps_merge (ret, temp);
499 GST_LOG_OBJECT (trans, " merged[%d]: %" GST_PTR_FORMAT, i, ret);
501 GST_LOG_OBJECT (trans, "merged: (%d)", gst_caps_get_size (ret));
502 /* FIXME: we can't do much simplification here because we don't really want to
503 * change the caps order
504 gst_caps_do_simplify (ret);
505 GST_DEBUG_OBJECT (trans, "simplified: (%d)", gst_caps_get_size (ret));
509 GST_DEBUG_OBJECT (trans, "identity from: %" GST_PTR_FORMAT, caps);
510 /* no transform function, use the identity transform */
511 ret = gst_caps_ref (caps);
514 GST_DEBUG_OBJECT (trans, "to: (%d) %" GST_PTR_FORMAT, gst_caps_get_size (ret),
520 /* transform a buffer of @size with @caps on the pad with @direction to
521 * the size of a buffer with @othercaps and store the result in @othersize
523 * We have two ways of doing this:
524 * 1) use a custom transform size function, this is for complicated custom
525 * cases with no fixed unit_size.
526 * 2) use the unit_size functions where there is a relationship between the
527 * caps and the size of a buffer.
530 gst_base_transform_transform_size (GstBaseTransform * trans,
531 GstPadDirection direction, GstCaps * caps,
532 gsize size, GstCaps * othercaps, gsize * othersize)
534 gsize inunitsize, outunitsize, units;
535 GstBaseTransformClass *klass;
538 klass = GST_BASE_TRANSFORM_GET_CLASS (trans);
540 GST_DEBUG_OBJECT (trans, "asked to transform size %d for caps %"
541 GST_PTR_FORMAT " to size for caps %" GST_PTR_FORMAT " in direction %s",
542 size, caps, othercaps, direction == GST_PAD_SRC ? "SRC" : "SINK");
544 if (klass->transform_size) {
545 /* if there is a custom transform function, use this */
546 ret = klass->transform_size (trans, direction, caps, size, othercaps,
548 } else if (klass->get_unit_size == NULL) {
549 /* if there is no transform_size and no unit_size, it means the
550 * element does not modify the size of a buffer */
554 /* there is no transform_size function, we have to use the unit_size
555 * functions. This method assumes there is a fixed unit_size associated with
556 * each caps. We provide the same amount of units on both sides. */
557 if (!gst_base_transform_get_unit_size (trans, caps, &inunitsize))
560 GST_DEBUG_OBJECT (trans, "input size %d, input unit size %d", size,
563 /* input size must be a multiple of the unit_size of the input caps */
564 if (inunitsize == 0 || (size % inunitsize != 0))
567 /* get the amount of units */
568 units = size / inunitsize;
570 /* now get the unit size of the output */
571 if (!gst_base_transform_get_unit_size (trans, othercaps, &outunitsize))
574 /* the output size is the unit_size times the amount of units on the
576 *othersize = units * outunitsize;
577 GST_DEBUG_OBJECT (trans, "transformed size to %d", *othersize);
586 GST_DEBUG_OBJECT (trans, "could not get in_size");
587 g_warning ("%s: could not get in_size", GST_ELEMENT_NAME (trans));
592 GST_DEBUG_OBJECT (trans, "Size %u is not a multiple of unit size %u", size,
594 g_warning ("%s: size %" G_GSIZE_FORMAT " is not a multiple of unit size %"
595 G_GSIZE_FORMAT, GST_ELEMENT_NAME (trans), size, inunitsize);
600 GST_DEBUG_OBJECT (trans, "could not get out_size");
601 g_warning ("%s: could not get out_size", GST_ELEMENT_NAME (trans));
606 /* get the caps that can be handled by @pad. We perform:
608 * - take the caps of peer of otherpad,
609 * - filter against the padtemplate of otherpad,
610 * - calculate all transforms of remaining caps
611 * - filter against template of @pad
613 * If there is no peer, we simply return the caps of the padtemplate of pad.
616 gst_base_transform_getcaps (GstPad * pad)
618 GstBaseTransform *trans;
620 GstCaps *peercaps, *caps;
622 trans = GST_BASE_TRANSFORM (gst_pad_get_parent (pad));
624 otherpad = (pad == trans->srcpad) ? trans->sinkpad : trans->srcpad;
626 /* we can do what the peer can */
627 peercaps = gst_pad_peer_get_caps (otherpad);
630 const GstCaps *templ;
632 GST_DEBUG_OBJECT (pad, "peer caps %" GST_PTR_FORMAT, peercaps);
634 /* filtered against our padtemplate on the other side */
635 templ = gst_pad_get_pad_template_caps (otherpad);
636 GST_DEBUG_OBJECT (pad, "our template %" GST_PTR_FORMAT, templ);
637 temp = gst_caps_intersect_full (peercaps, templ, GST_CAPS_INTERSECT_FIRST);
638 GST_DEBUG_OBJECT (pad, "intersected %" GST_PTR_FORMAT, temp);
640 /* then see what we can transform this to */
641 caps = gst_base_transform_transform_caps (trans,
642 GST_PAD_DIRECTION (otherpad), temp);
643 GST_DEBUG_OBJECT (pad, "transformed %" GST_PTR_FORMAT, caps);
644 gst_caps_unref (temp);
648 /* and filter against the template of this pad */
649 templ = gst_pad_get_pad_template_caps (pad);
650 GST_DEBUG_OBJECT (pad, "our template %" GST_PTR_FORMAT, templ);
651 /* We keep the caps sorted like the returned caps */
652 temp = gst_caps_intersect_full (caps, templ, GST_CAPS_INTERSECT_FIRST);
653 GST_DEBUG_OBJECT (pad, "intersected %" GST_PTR_FORMAT, temp);
654 gst_caps_unref (caps);
657 /* Now try if we can put the untransformed downstream caps first */
658 temp = gst_caps_intersect_full (peercaps, caps, GST_CAPS_INTERSECT_FIRST);
659 if (!gst_caps_is_empty (temp)) {
660 gst_caps_merge (temp, caps);
663 gst_caps_unref (temp);
666 /* no peer or the peer can do anything, our padtemplate is enough then */
667 caps = gst_caps_copy (gst_pad_get_pad_template_caps (pad));
671 GST_DEBUG_OBJECT (trans, "returning %" GST_PTR_FORMAT, caps);
674 gst_caps_unref (peercaps);
676 gst_object_unref (trans);
681 /* function triggered when the in and out caps are negotiated and need
682 * to be configured in the subclass. */
684 gst_base_transform_configure_caps (GstBaseTransform * trans, GstCaps * in,
688 GstBaseTransformClass *klass;
690 klass = GST_BASE_TRANSFORM_GET_CLASS (trans);
692 GST_DEBUG_OBJECT (trans, "in caps: %" GST_PTR_FORMAT, in);
693 GST_DEBUG_OBJECT (trans, "out caps: %" GST_PTR_FORMAT, out);
695 /* clear the cache */
696 gst_caps_replace (&trans->cache_caps1, NULL);
697 gst_caps_replace (&trans->cache_caps2, NULL);
699 /* figure out same caps state */
700 trans->have_same_caps = gst_caps_is_equal (in, out);
701 GST_DEBUG_OBJECT (trans, "have_same_caps: %d", trans->have_same_caps);
703 /* If we've a transform_ip method and same input/output caps, set in_place
704 * by default. If for some reason the sub-class prefers using a transform
705 * function, it can clear the in place flag in the set_caps */
706 gst_base_transform_set_in_place (trans,
707 klass->transform_ip && trans->have_same_caps);
709 /* Set the passthrough if the class wants passthrough_on_same_caps
710 * and we have the same caps on each pad */
711 if (klass->passthrough_on_same_caps)
712 gst_base_transform_set_passthrough (trans, trans->have_same_caps);
714 /* now configure the element with the caps */
715 if (klass->set_caps) {
716 GST_DEBUG_OBJECT (trans, "Calling set_caps method to setup caps");
717 ret = klass->set_caps (trans, in, out);
720 trans->negotiated = ret;
725 /* given a fixed @caps on @pad, create the best possible caps for the
727 * @caps must be fixed when calling this function.
729 * This function calls the transform caps vmethod of the basetransform to figure
730 * out the possible target formats. It then tries to select the best format from
733 * - attempt passthrough if the target caps is a superset of the input caps
734 * - fixating by using peer caps
735 * - fixating with transform fixate function
736 * - fixating with pad fixate functions.
738 * this function returns a caps that can be transformed into and is accepted by
742 gst_base_transform_find_transform (GstBaseTransform * trans, GstPad * pad,
743 GstCaps * caps, gboolean reconfigure)
745 GstBaseTransformClass *klass;
746 GstPad *otherpad, *otherpeer;
748 gboolean peer_checked = FALSE;
751 /* caps must be fixed here, this is a programming error if it's not */
752 g_return_val_if_fail (gst_caps_is_fixed (caps), NULL);
754 klass = GST_BASE_TRANSFORM_GET_CLASS (trans);
756 otherpad = (pad == trans->srcpad) ? trans->sinkpad : trans->srcpad;
757 otherpeer = gst_pad_get_peer (otherpad);
759 /* see how we can transform the input caps. We need to do this even for
760 * passthrough because it might be possible that this element cannot support
761 * passthrough at all. */
762 othercaps = gst_base_transform_transform_caps (trans,
763 GST_PAD_DIRECTION (pad), caps);
765 /* The caps we can actually output is the intersection of the transformed
766 * caps with the pad template for the pad */
769 const GstCaps *templ_caps;
771 templ_caps = gst_pad_get_pad_template_caps (otherpad);
772 GST_DEBUG_OBJECT (trans,
773 "intersecting against padtemplate %" GST_PTR_FORMAT, templ_caps);
776 gst_caps_intersect_full (othercaps, templ_caps,
777 GST_CAPS_INTERSECT_FIRST);
779 gst_caps_unref (othercaps);
780 othercaps = intersect;
783 /* check if transform is empty */
784 if (!othercaps || gst_caps_is_empty (othercaps))
787 /* if the othercaps are not fixed, we need to fixate them, first attempt
788 * is by attempting passthrough if the othercaps are a superset of caps. */
789 /* FIXME. maybe the caps is not fixed because it has multiple structures of
791 is_fixed = gst_caps_is_fixed (othercaps);
792 if (!is_fixed && !reconfigure) {
793 GST_DEBUG_OBJECT (trans,
794 "transform returned non fixed %" GST_PTR_FORMAT, othercaps);
796 /* see if the target caps are a superset of the source caps, in this
797 * case we can try to perform passthrough */
798 if (gst_caps_can_intersect (othercaps, caps)) {
799 GST_DEBUG_OBJECT (trans, "try passthrough with %" GST_PTR_FORMAT, caps);
801 /* try passthrough. we know it's fixed, because caps is fixed */
802 if (gst_pad_accept_caps (otherpeer, caps)) {
803 GST_DEBUG_OBJECT (trans, "peer accepted %" GST_PTR_FORMAT, caps);
804 /* peer accepted unmodified caps, we free the original non-fixed
805 * caps and work with the passthrough caps */
806 gst_caps_unref (othercaps);
807 othercaps = gst_caps_ref (caps);
809 /* mark that we checked othercaps with the peer, this
810 * makes sure we don't call accept_caps again with these same
814 GST_DEBUG_OBJECT (trans,
815 "peer did not accept %" GST_PTR_FORMAT, caps);
818 GST_DEBUG_OBJECT (trans, "no peer, doing passthrough");
819 gst_caps_unref (othercaps);
820 othercaps = gst_caps_ref (caps);
826 /* second attempt at fixation is done by intersecting with
828 if (!is_fixed && otherpeer) {
829 /* intersect against what the peer can do */
833 GST_DEBUG_OBJECT (trans, "othercaps now %" GST_PTR_FORMAT, othercaps);
835 peercaps = gst_pad_get_caps (otherpeer);
837 intersect = gst_caps_intersect (peercaps, othercaps);
840 gst_caps_intersect_full (peercaps, othercaps,
841 GST_CAPS_INTERSECT_FIRST);
842 gst_caps_unref (peercaps);
843 gst_caps_unref (othercaps);
844 othercaps = intersect;
845 peer_checked = FALSE;
847 is_fixed = gst_caps_is_fixed (othercaps);
849 GST_DEBUG_OBJECT (trans,
850 "filtering against peer yields %" GST_PTR_FORMAT, othercaps);
853 if (gst_caps_is_empty (othercaps))
854 goto no_transform_possible;
856 /* third attempt at fixation, call the fixate vmethod and
857 * ultimately call the pad fixate function. */
859 GST_DEBUG_OBJECT (trans,
860 "trying to fixate %" GST_PTR_FORMAT " on pad %s:%s",
861 othercaps, GST_DEBUG_PAD_NAME (otherpad));
863 /* since we have no other way to fixate left, we might as well just take
864 * the first of the caps list and fixate that */
866 /* FIXME: when fixating using the vmethod, it might make sense to fixate
867 * each of the caps; but Wim doesn't see a use case for that yet */
868 gst_caps_truncate (othercaps);
869 peer_checked = FALSE;
871 if (klass->fixate_caps) {
872 GST_DEBUG_OBJECT (trans, "trying to fixate %" GST_PTR_FORMAT
873 " using caps %" GST_PTR_FORMAT
874 " on pad %s:%s using fixate_caps vmethod", othercaps, caps,
875 GST_DEBUG_PAD_NAME (otherpad));
876 klass->fixate_caps (trans, GST_PAD_DIRECTION (pad), caps, othercaps);
877 is_fixed = gst_caps_is_fixed (othercaps);
879 /* if still not fixed, no other option but to let the default pad fixate
880 * function do its job */
882 GST_DEBUG_OBJECT (trans, "trying to fixate %" GST_PTR_FORMAT
883 " on pad %s:%s using gst_pad_fixate_caps", othercaps,
884 GST_DEBUG_PAD_NAME (otherpad));
885 gst_pad_fixate_caps (otherpad, othercaps);
886 is_fixed = gst_caps_is_fixed (othercaps);
888 GST_DEBUG_OBJECT (trans, "after fixating %" GST_PTR_FORMAT, othercaps);
890 GST_DEBUG ("caps are fixed");
891 /* else caps are fixed but the subclass may want to add fields */
892 if (klass->fixate_caps) {
893 othercaps = gst_caps_make_writable (othercaps);
895 GST_DEBUG_OBJECT (trans, "doing fixate %" GST_PTR_FORMAT
896 " using caps %" GST_PTR_FORMAT
897 " on pad %s:%s using fixate_caps vmethod", othercaps, caps,
898 GST_DEBUG_PAD_NAME (otherpad));
900 klass->fixate_caps (trans, GST_PAD_DIRECTION (pad), caps, othercaps);
901 is_fixed = gst_caps_is_fixed (othercaps);
905 /* caps should be fixed now, if not we have to fail. */
907 goto could_not_fixate;
909 /* and peer should accept, don't check again if we already checked the
910 * othercaps against the peer. */
911 if (!peer_checked && otherpeer && !gst_pad_accept_caps (otherpeer, othercaps))
914 GST_DEBUG_OBJECT (trans, "Input caps were %" GST_PTR_FORMAT
915 ", and got final caps %" GST_PTR_FORMAT, caps, othercaps);
918 gst_object_unref (otherpeer);
925 GST_DEBUG_OBJECT (trans,
926 "transform returned useless %" GST_PTR_FORMAT, othercaps);
929 no_transform_possible:
931 GST_DEBUG_OBJECT (trans,
932 "transform could not transform %" GST_PTR_FORMAT
933 " in anything we support", caps);
938 GST_DEBUG_OBJECT (trans, "FAILED to fixate %" GST_PTR_FORMAT, othercaps);
943 GST_DEBUG_OBJECT (trans, "FAILED to get peer of %" GST_PTR_FORMAT
944 " to accept %" GST_PTR_FORMAT, otherpad, othercaps);
950 gst_object_unref (otherpeer);
952 gst_caps_unref (othercaps);
958 gst_base_transform_acceptcaps_default (GstBaseTransform * trans,
959 GstPadDirection direction, GstCaps * caps)
963 GstCaps *othercaps = NULL;
968 otherpad = (pad == trans->srcpad) ? trans->sinkpad : trans->srcpad;
970 /* we need fixed caps for the check, fall back to the default implementation
972 if (!gst_caps_is_fixed (caps))
977 GST_DEBUG_OBJECT (trans, "non fixed accept caps %" GST_PTR_FORMAT, caps);
979 /* get all the formats we can handle on this pad */
980 if (direction == GST_PAD_SRC)
981 allowed = gst_pad_get_caps (trans->srcpad);
983 allowed = gst_pad_get_caps (trans->sinkpad);
986 GST_DEBUG_OBJECT (trans, "gst_pad_get_caps() failed");
987 goto no_transform_possible;
990 GST_DEBUG_OBJECT (trans, "allowed caps %" GST_PTR_FORMAT, allowed);
992 /* intersect with the requested format */
993 ret = gst_caps_can_intersect (allowed, caps);
994 gst_caps_unref (allowed);
997 goto no_transform_possible;
1001 GST_DEBUG_OBJECT (pad, "accept caps %" GST_PTR_FORMAT, caps);
1003 /* find best possible caps for the other pad as a way to see if we can
1004 * transform this caps. */
1005 othercaps = gst_base_transform_find_transform (trans, pad, caps, FALSE);
1006 if (!othercaps || gst_caps_is_empty (othercaps))
1007 goto no_transform_possible;
1009 GST_DEBUG_OBJECT (pad, "we can transform to %" GST_PTR_FORMAT, othercaps);
1015 /* We know it's always NULL since we never use it */
1017 gst_caps_unref (othercaps);
1023 no_transform_possible:
1025 GST_DEBUG_OBJECT (trans,
1026 "transform could not transform %" GST_PTR_FORMAT
1027 " in anything we support", caps);
1034 gst_base_transform_acceptcaps (GstPad * pad, GstCaps * caps)
1036 gboolean ret = TRUE;
1037 GstBaseTransform *trans;
1038 GstBaseTransformClass *bclass;
1040 trans = GST_BASE_TRANSFORM (gst_pad_get_parent (pad));
1041 bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
1043 if (bclass->accept_caps)
1044 ret = bclass->accept_caps (trans, GST_PAD_DIRECTION (pad), caps);
1046 gst_object_unref (trans);
1051 /* called when new caps arrive on the sink or source pad,
1052 * We try to find the best caps for the other side using our _find_transform()
1053 * function. If there are caps, we configure the transform for this new
1056 * FIXME, this function is currently commutative but this should not really be
1057 * because we never set caps starting from the srcpad.
1060 gst_base_transform_setcaps (GstBaseTransform * trans, GstPad * pad,
1061 GstCaps * caps, gboolean reconfigure)
1063 GstPad *otherpad, *otherpeer;
1064 GstCaps *othercaps = NULL;
1065 gboolean ret = TRUE;
1066 GstCaps *incaps, *outcaps;
1068 otherpad = (pad == trans->srcpad) ? trans->sinkpad : trans->srcpad;
1069 otherpeer = gst_pad_get_peer (otherpad);
1071 /* if we get called recursively, we bail out now to avoid an
1073 if (GST_PAD_IS_IN_SETCAPS (otherpad))
1076 GST_DEBUG_OBJECT (pad, "have new caps %p %" GST_PTR_FORMAT, caps, caps);
1078 /* find best possible caps for the other pad */
1079 othercaps = gst_base_transform_find_transform (trans, pad, caps, reconfigure);
1080 if (!othercaps || gst_caps_is_empty (othercaps))
1081 goto no_transform_possible;
1083 /* configure the element now */
1084 /* make sure in and out caps are correct */
1085 if (pad == trans->sinkpad) {
1087 outcaps = othercaps;
1093 /* if we have the same caps, we can optimize and reuse the input caps */
1094 if (gst_caps_is_equal (incaps, outcaps)) {
1095 GST_INFO_OBJECT (trans, "reuse caps");
1096 gst_caps_unref (othercaps);
1097 outcaps = othercaps = gst_caps_ref (incaps);
1100 /* call configure now */
1101 if (!(ret = gst_base_transform_configure_caps (trans, incaps, outcaps)))
1102 goto failed_configure;
1104 /* we know this will work, we implement the setcaps */
1105 gst_pad_set_caps (otherpad, othercaps);
1107 if (pad == trans->srcpad && trans->priv->pad_mode == GST_ACTIVATE_PULL) {
1109 ret &= gst_pad_set_caps (otherpeer, othercaps);
1111 GST_INFO_OBJECT (trans, "otherpeer setcaps(%" GST_PTR_FORMAT ") failed",
1118 gst_object_unref (otherpeer);
1120 gst_caps_unref (othercaps);
1122 trans->negotiated = ret;
1127 no_transform_possible:
1129 GST_WARNING_OBJECT (trans,
1130 "transform could not transform %" GST_PTR_FORMAT
1131 " in anything we support", caps);
1137 GST_WARNING_OBJECT (trans, "FAILED to configure caps %" GST_PTR_FORMAT
1138 " to accept %" GST_PTR_FORMAT, otherpad, othercaps);
1145 gst_base_transform_query (GstPad * pad, GstQuery ** query)
1147 gboolean ret = FALSE;
1148 GstBaseTransform *trans;
1151 trans = GST_BASE_TRANSFORM (gst_pad_get_parent (pad));
1152 if (G_UNLIKELY (trans == NULL))
1154 otherpad = (pad == trans->srcpad) ? trans->sinkpad : trans->srcpad;
1156 switch (GST_QUERY_TYPE (*query)) {
1157 case GST_QUERY_POSITION:{
1160 gst_query_parse_position (*query, &format, NULL);
1161 if (format == GST_FORMAT_TIME && trans->segment.format == GST_FORMAT_TIME) {
1165 if ((pad == trans->sinkpad)
1166 || (trans->priv->position_out == GST_CLOCK_TIME_NONE)) {
1168 gst_segment_to_stream_time (&trans->segment, GST_FORMAT_TIME,
1169 trans->segment.position);
1171 pos = gst_segment_to_stream_time (&trans->segment, GST_FORMAT_TIME,
1172 trans->priv->position_out);
1174 gst_query_set_position (*query, format, pos);
1176 ret = gst_pad_peer_query (otherpad, query);
1181 ret = gst_pad_peer_query (otherpad, query);
1185 gst_object_unref (trans);
1189 static const GstQueryType *
1190 gst_base_transform_query_type (GstPad * pad)
1192 static const GstQueryType types[] = {
1200 /* Allocate a buffer using gst_pad_alloc_buffer
1202 * This function can do renegotiation on the source pad
1204 * The output buffer is always writable. outbuf can be equal to
1205 * inbuf, the caller should be prepared for this and perform
1206 * appropriate refcounting.
1208 static GstFlowReturn
1209 gst_base_transform_prepare_output_buffer (GstBaseTransform * trans,
1210 GstBuffer * in_buf, GstBuffer ** out_buf)
1212 GstBaseTransformClass *bclass;
1213 GstBaseTransformPrivate *priv;
1214 GstFlowReturn ret = GST_FLOW_OK;
1215 gboolean discard, copymeta;
1216 gsize insize, outsize;
1217 GstCaps *incaps = NULL, *outcaps = NULL;
1219 bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
1225 insize = gst_buffer_get_size (in_buf);
1227 /* figure out how to allocate a buffer based on the current configuration */
1228 if (trans->passthrough) {
1229 GST_DEBUG_OBJECT (trans, "doing passthrough alloc");
1230 /* passthrough, we don't really need to call pad alloc but we still need to
1231 * in order to get upstream negotiation. The output size is the same as the
1234 /* we always alloc and discard here */
1237 gboolean want_in_place = (bclass->transform_ip != NULL)
1238 && trans->always_in_place;
1240 if (want_in_place) {
1241 GST_DEBUG_OBJECT (trans, "doing inplace alloc");
1242 /* we alloc a buffer of the same size as the input */
1244 /* only discard it when the input was not writable, otherwise, we reuse
1245 * the input buffer. */
1246 discard = gst_buffer_is_writable (in_buf);
1247 GST_DEBUG_OBJECT (trans, "discard: %d", discard);
1249 incaps = gst_pad_get_current_caps (trans->sinkpad);
1250 outcaps = gst_pad_get_current_caps (trans->srcpad);
1252 GST_DEBUG_OBJECT (trans, "getting output size for copy transform");
1253 /* copy transform, figure out the output size */
1254 if (!gst_base_transform_transform_size (trans,
1255 GST_PAD_SINK, incaps, insize, outcaps, &outsize)) {
1258 /* never discard this buffer, we need it for storing the output */
1263 if (bclass->prepare_output_buffer) {
1264 if (outcaps == NULL)
1265 outcaps = gst_pad_get_current_caps (trans->srcpad);
1267 GST_DEBUG_OBJECT (trans,
1268 "calling prepare buffer with caps %p %" GST_PTR_FORMAT, outcaps,
1271 bclass->prepare_output_buffer (trans, in_buf, outsize, outcaps,
1274 /* get a new ref to the srcpad caps, the prepare_output_buffer function can
1275 * update the pad caps if it wants */
1277 gst_caps_unref (outcaps);
1278 outcaps = gst_pad_get_current_caps (trans->srcpad);
1281 * decrease refcount again if vmethod returned refcounted in_buf. This
1282 * is because we need to make sure that the buffer is writable for the
1283 * in_place transform. The docs of the vmethod say that you should return
1284 * a reffed inbuf, which is exactly what we don't want :), oh well.. */
1285 if (in_buf == *out_buf)
1286 gst_buffer_unref (in_buf);
1288 /* never discard the buffer from the prepare_buffer method */
1289 if (*out_buf != NULL)
1293 if (ret != GST_FLOW_OK)
1296 if (*out_buf == NULL) {
1297 if (trans->passthrough) {
1298 GST_DEBUG_OBJECT (trans, "Avoiding pad alloc");
1299 *out_buf = gst_buffer_ref (in_buf);
1301 GST_DEBUG_OBJECT (trans, "doing alloc of size %u", outsize);
1303 *out_buf = gst_buffer_new_and_alloc (outsize);
1307 /* must always have a buffer by now */
1308 if (*out_buf == NULL)
1312 if (*out_buf == NULL) {
1314 GST_DEBUG_OBJECT (trans, "make default output buffer of size %d",
1316 /* no valid buffer yet, make one, metadata is writable */
1317 *out_buf = gst_buffer_new_and_alloc (outsize);
1318 gst_buffer_copy_into (*out_buf, in_buf,
1319 GST_BUFFER_COPY_FLAGS | GST_BUFFER_COPY_TIMESTAMPS, 0, -1);
1321 GST_DEBUG_OBJECT (trans, "reuse input buffer");
1325 if (trans->passthrough && in_buf != *out_buf) {
1326 /* we are asked to perform a passthrough transform but the input and
1327 * output buffers are different. We have to discard the output buffer and
1328 * reuse the input buffer. */
1329 GST_DEBUG_OBJECT (trans, "passthrough but different buffers");
1333 GST_DEBUG_OBJECT (trans, "discard buffer, reuse input buffer");
1334 gst_buffer_unref (*out_buf);
1337 GST_DEBUG_OBJECT (trans, "using allocated buffer in %p, out %p", in_buf,
1339 /* if we have different buffers, check if the metadata is ok */
1340 if (*out_buf != in_buf) {
1343 mask = GST_BUFFER_FLAG_PREROLL | GST_BUFFER_FLAG_IN_CAPS |
1344 GST_BUFFER_FLAG_DELTA_UNIT | GST_BUFFER_FLAG_DISCONT |
1345 GST_BUFFER_FLAG_GAP | GST_BUFFER_FLAG_MEDIA1 |
1346 GST_BUFFER_FLAG_MEDIA2 | GST_BUFFER_FLAG_MEDIA3;
1347 /* see if the flags and timestamps match */
1349 (GST_MINI_OBJECT_FLAGS (*out_buf) & mask) ==
1350 (GST_MINI_OBJECT_FLAGS (in_buf) & mask);
1352 GST_BUFFER_TIMESTAMP (*out_buf) != GST_BUFFER_TIMESTAMP (in_buf) ||
1353 GST_BUFFER_DURATION (*out_buf) != GST_BUFFER_DURATION (in_buf) ||
1354 GST_BUFFER_OFFSET (*out_buf) != GST_BUFFER_OFFSET (in_buf) ||
1355 GST_BUFFER_OFFSET_END (*out_buf) != GST_BUFFER_OFFSET_END (in_buf);
1360 /* we need to modify the metadata when the element is not gap aware,
1361 * passthrough is not used and the gap flag is set */
1362 copymeta |= !trans->priv->gap_aware && !trans->passthrough
1363 && (GST_MINI_OBJECT_FLAGS (*out_buf) & GST_BUFFER_FLAG_GAP);
1366 GST_DEBUG_OBJECT (trans, "copymeta %d", copymeta);
1367 if (!gst_buffer_is_writable (*out_buf)) {
1368 GST_DEBUG_OBJECT (trans, "buffer %p not writable", *out_buf);
1369 if (in_buf == *out_buf)
1370 *out_buf = gst_buffer_copy (in_buf);
1372 *out_buf = gst_buffer_make_writable (*out_buf);
1374 /* when we get here, the metadata should be writable */
1376 gst_buffer_copy_into (*out_buf, in_buf,
1377 GST_BUFFER_COPY_FLAGS | GST_BUFFER_COPY_TIMESTAMPS, 0, -1);
1378 /* clear the GAP flag when the subclass does not understand it */
1379 if (!trans->priv->gap_aware)
1380 GST_BUFFER_FLAG_UNSET (*out_buf, GST_BUFFER_FLAG_GAP);
1385 gst_caps_unref (incaps);
1387 gst_caps_unref (outcaps);
1394 GST_WARNING_OBJECT (trans, "pad-alloc failed: %s", gst_flow_get_name (ret));
1399 GST_ELEMENT_ERROR (trans, STREAM, NOT_IMPLEMENTED,
1400 ("Sub-class failed to provide an output buffer"), (NULL));
1401 ret = GST_FLOW_ERROR;
1406 GST_ERROR_OBJECT (trans, "unknown output size");
1407 ret = GST_FLOW_ERROR;
1412 /* Given @caps calcultate the size of one unit.
1414 * For video caps, this is the size of one frame (and thus one buffer).
1415 * For audio caps, this is the size of one sample.
1417 * These values are cached since they do not change and the calculation
1418 * potentially involves parsing caps and other expensive stuff.
1420 * We have two cache locations to store the size, one for the source caps
1421 * and one for the sink caps.
1423 * this function returns FALSE if no size could be calculated.
1426 gst_base_transform_get_unit_size (GstBaseTransform * trans, GstCaps * caps,
1429 gboolean res = FALSE;
1430 GstBaseTransformClass *bclass;
1432 /* see if we have the result cached */
1433 if (trans->cache_caps1 == caps) {
1434 *size = trans->cache_caps1_size;
1435 GST_DEBUG_OBJECT (trans, "returned %d from first cache", *size);
1438 if (trans->cache_caps2 == caps) {
1439 *size = trans->cache_caps2_size;
1440 GST_DEBUG_OBJECT (trans, "returned %d from second cached", *size);
1444 bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
1445 if (bclass->get_unit_size) {
1446 res = bclass->get_unit_size (trans, caps, size);
1447 GST_DEBUG_OBJECT (trans, "caps %" GST_PTR_FORMAT
1448 ") has unit size %d, result %s", caps, *size, res ? "TRUE" : "FALSE");
1451 /* and cache the values */
1452 if (trans->cache_caps1 == NULL) {
1453 gst_caps_replace (&trans->cache_caps1, caps);
1454 trans->cache_caps1_size = *size;
1455 GST_DEBUG_OBJECT (trans, "caching %d in first cache", *size);
1456 } else if (trans->cache_caps2 == NULL) {
1457 gst_caps_replace (&trans->cache_caps2, caps);
1458 trans->cache_caps2_size = *size;
1459 GST_DEBUG_OBJECT (trans, "caching %d in second cache", *size);
1461 GST_DEBUG_OBJECT (trans, "no free spot to cache unit_size");
1465 GST_DEBUG_OBJECT (trans, "Sub-class does not implement get_unit_size");
1471 gst_base_transform_sink_event (GstPad * pad, GstEvent * event)
1473 GstBaseTransform *trans;
1474 GstBaseTransformClass *bclass;
1475 gboolean ret = TRUE;
1476 gboolean forward = TRUE;
1478 trans = GST_BASE_TRANSFORM (gst_pad_get_parent (pad));
1479 if (G_UNLIKELY (trans == NULL)) {
1480 gst_event_unref (event);
1483 bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
1486 forward = bclass->event (trans, event);
1488 /* FIXME, do this in the default event handler so the subclass can do
1489 * something different. */
1491 ret = gst_pad_push_event (trans->srcpad, event);
1493 gst_event_unref (event);
1495 gst_object_unref (trans);
1501 gst_base_transform_sink_eventfunc (GstBaseTransform * trans, GstEvent * event)
1503 gboolean forward = TRUE;
1505 switch (GST_EVENT_TYPE (event)) {
1506 case GST_EVENT_FLUSH_START:
1508 case GST_EVENT_FLUSH_STOP:
1509 GST_OBJECT_LOCK (trans);
1510 /* reset QoS parameters */
1511 trans->priv->proportion = 1.0;
1512 trans->priv->earliest_time = -1;
1513 trans->priv->discont = FALSE;
1514 trans->priv->processed = 0;
1515 trans->priv->dropped = 0;
1516 GST_OBJECT_UNLOCK (trans);
1517 /* we need new segment info after the flush. */
1518 trans->have_segment = FALSE;
1519 gst_segment_init (&trans->segment, GST_FORMAT_UNDEFINED);
1520 trans->priv->position_out = GST_CLOCK_TIME_NONE;
1526 case GST_EVENT_CAPS:
1530 gst_event_parse_caps (event, &caps);
1531 gst_base_transform_setcaps (trans, trans->sinkpad, caps, FALSE);
1536 case GST_EVENT_SEGMENT:
1538 gst_event_parse_segment (event, &trans->segment);
1539 trans->have_segment = TRUE;
1541 GST_DEBUG_OBJECT (trans, "received SEGMENT %" GST_SEGMENT_FORMAT,
1553 gst_base_transform_src_event (GstPad * pad, GstEvent * event)
1555 GstBaseTransform *trans;
1556 GstBaseTransformClass *bclass;
1557 gboolean ret = TRUE;
1559 trans = GST_BASE_TRANSFORM (gst_pad_get_parent (pad));
1560 if (G_UNLIKELY (trans == NULL)) {
1561 gst_event_unref (event);
1565 bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
1567 if (bclass->src_event)
1568 ret = bclass->src_event (trans, event);
1570 gst_event_unref (event);
1572 gst_object_unref (trans);
1578 gst_base_transform_src_eventfunc (GstBaseTransform * trans, GstEvent * event)
1582 GST_DEBUG_OBJECT (trans, "handling event %p %" GST_PTR_FORMAT, event, event);
1584 switch (GST_EVENT_TYPE (event)) {
1585 case GST_EVENT_SEEK:
1587 case GST_EVENT_NAVIGATION:
1592 GstClockTimeDiff diff;
1593 GstClockTime timestamp;
1595 gst_event_parse_qos (event, NULL, &proportion, &diff, ×tamp);
1596 gst_base_transform_update_qos (trans, proportion, diff, timestamp);
1603 ret = gst_pad_push_event (trans->sinkpad, event);
1608 /* perform a transform on @inbuf and put the result in @outbuf.
1610 * This function is common to the push and pull-based operations.
1612 * This function takes ownership of @inbuf */
1613 static GstFlowReturn
1614 gst_base_transform_handle_buffer (GstBaseTransform * trans, GstBuffer * inbuf,
1615 GstBuffer ** outbuf)
1617 GstBaseTransformClass *bclass;
1618 GstFlowReturn ret = GST_FLOW_OK;
1619 gboolean want_in_place;
1620 GstClockTime running_time;
1621 GstClockTime timestamp;
1623 gboolean reconfigure;
1625 bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
1627 GST_OBJECT_LOCK (trans->sinkpad);
1628 reconfigure = GST_PAD_NEEDS_RECONFIGURE (trans->srcpad)
1629 || trans->priv->reconfigure;
1630 GST_OBJECT_FLAG_UNSET (trans->srcpad, GST_PAD_NEED_RECONFIGURE);
1631 trans->priv->reconfigure = FALSE;
1632 GST_OBJECT_UNLOCK (trans->sinkpad);
1634 if (G_UNLIKELY (reconfigure)) {
1637 GST_DEBUG_OBJECT (trans, "we had a pending reconfigure");
1639 incaps = gst_pad_get_current_caps (trans->sinkpad);
1641 goto no_reconfigure;
1643 /* if we need to reconfigure we pretend a buffer with new caps arrived. This
1644 * will reconfigure the transform with the new output format. We can only
1645 * do this if the buffer actually has caps. */
1646 if (!gst_base_transform_setcaps (trans, trans->sinkpad, incaps, TRUE)) {
1647 gst_caps_unref (incaps);
1648 goto not_negotiated;
1650 gst_caps_unref (incaps);
1654 insize = gst_buffer_get_size (inbuf);
1656 if (GST_BUFFER_OFFSET_IS_VALID (inbuf))
1657 GST_DEBUG_OBJECT (trans,
1658 "handling buffer %p of size %" G_GSIZE_FORMAT " and offset %"
1659 G_GUINT64_FORMAT, inbuf, insize, GST_BUFFER_OFFSET (inbuf));
1661 GST_DEBUG_OBJECT (trans,
1662 "handling buffer %p of size %" G_GSIZE_FORMAT " and offset NONE", inbuf,
1665 /* Don't allow buffer handling before negotiation, except in passthrough mode
1666 * or if the class doesn't implement a set_caps function (in which case it doesn't
1669 if (!trans->negotiated && !trans->passthrough && (bclass->set_caps != NULL))
1670 goto not_negotiated;
1672 /* Set discont flag so we can mark the outgoing buffer */
1673 if (GST_BUFFER_IS_DISCONT (inbuf)) {
1674 GST_DEBUG_OBJECT (trans, "got DISCONT buffer %p", inbuf);
1675 trans->priv->discont = TRUE;
1678 /* can only do QoS if the segment is in TIME */
1679 if (trans->segment.format != GST_FORMAT_TIME)
1682 /* QOS is done on the running time of the buffer, get it now */
1683 timestamp = GST_BUFFER_TIMESTAMP (inbuf);
1684 running_time = gst_segment_to_running_time (&trans->segment, GST_FORMAT_TIME,
1687 if (running_time != -1) {
1689 GstClockTime earliest_time;
1692 /* lock for getting the QoS parameters that are set (in a different thread)
1693 * with the QOS events */
1694 GST_OBJECT_LOCK (trans);
1695 earliest_time = trans->priv->earliest_time;
1696 proportion = trans->priv->proportion;
1697 /* check for QoS, don't perform conversion for buffers
1698 * that are known to be late. */
1699 need_skip = trans->priv->qos_enabled &&
1700 earliest_time != -1 && running_time <= earliest_time;
1701 GST_OBJECT_UNLOCK (trans);
1704 GstMessage *qos_msg;
1705 GstClockTime duration;
1706 guint64 stream_time;
1709 GST_CAT_DEBUG_OBJECT (GST_CAT_QOS, trans, "skipping transform: qostime %"
1710 GST_TIME_FORMAT " <= %" GST_TIME_FORMAT,
1711 GST_TIME_ARGS (running_time), GST_TIME_ARGS (earliest_time));
1713 trans->priv->dropped++;
1715 duration = GST_BUFFER_DURATION (inbuf);
1717 gst_segment_to_stream_time (&trans->segment, GST_FORMAT_TIME,
1719 jitter = GST_CLOCK_DIFF (running_time, earliest_time);
1722 gst_message_new_qos (GST_OBJECT_CAST (trans), FALSE, running_time,
1723 stream_time, timestamp, duration);
1724 gst_message_set_qos_values (qos_msg, jitter, proportion, 1000000);
1725 gst_message_set_qos_stats (qos_msg, GST_FORMAT_BUFFERS,
1726 trans->priv->processed, trans->priv->dropped);
1727 gst_element_post_message (GST_ELEMENT_CAST (trans), qos_msg);
1729 /* mark discont for next buffer */
1730 trans->priv->discont = TRUE;
1737 /* first try to allocate an output buffer based on the currently negotiated
1738 * format. While we call pad-alloc we could renegotiate the srcpad format or
1739 * have a new suggestion for upstream buffer-alloc.
1740 * In any case, outbuf will contain a buffer suitable for doing the configured
1741 * transform after this function. */
1742 ret = gst_base_transform_prepare_output_buffer (trans, inbuf, outbuf);
1743 if (G_UNLIKELY (ret != GST_FLOW_OK))
1746 /* now perform the needed transform */
1747 if (trans->passthrough) {
1748 /* In passthrough mode, give transform_ip a look at the
1749 * buffer, without making it writable, or just push the
1751 if (bclass->transform_ip) {
1752 GST_DEBUG_OBJECT (trans, "doing passthrough transform");
1753 ret = bclass->transform_ip (trans, *outbuf);
1755 GST_DEBUG_OBJECT (trans, "element is in passthrough");
1758 want_in_place = (bclass->transform_ip != NULL) && trans->always_in_place;
1760 if (want_in_place) {
1761 GST_DEBUG_OBJECT (trans, "doing inplace transform");
1763 if (inbuf != *outbuf) {
1764 guint8 *indata, *outdata;
1765 gsize insize, outsize;
1767 /* Different buffer. The data can still be the same when we are dealing
1768 * with subbuffers of the same buffer. Note that because of the FIXME in
1769 * prepare_output_buffer() we have decreased the refcounts of inbuf and
1770 * outbuf to keep them writable */
1771 indata = gst_buffer_map (inbuf, &insize, NULL, GST_MAP_READ);
1772 outdata = gst_buffer_map (*outbuf, &outsize, NULL, GST_MAP_WRITE);
1774 if (indata != outdata)
1775 memcpy (outdata, indata, insize);
1777 gst_buffer_unmap (inbuf, indata, insize);
1778 gst_buffer_unmap (*outbuf, outdata, outsize);
1780 ret = bclass->transform_ip (trans, *outbuf);
1782 GST_DEBUG_OBJECT (trans, "doing non-inplace transform");
1784 if (bclass->transform)
1785 ret = bclass->transform (trans, inbuf, *outbuf);
1787 ret = GST_FLOW_NOT_SUPPORTED;
1792 /* only unref input buffer if we allocated a new outbuf buffer */
1793 if (*outbuf != inbuf)
1794 gst_buffer_unref (inbuf);
1801 gst_buffer_unref (inbuf);
1802 GST_ELEMENT_ERROR (trans, STREAM, NOT_IMPLEMENTED,
1803 ("not negotiated"), ("not negotiated"));
1804 return GST_FLOW_NOT_NEGOTIATED;
1808 gst_buffer_unref (inbuf);
1809 GST_WARNING_OBJECT (trans, "could not get buffer from pool: %s",
1810 gst_flow_get_name (ret));
1816 gst_base_transform_check_get_range (GstPad * pad)
1818 GstBaseTransform *trans;
1821 trans = GST_BASE_TRANSFORM (gst_pad_get_parent (pad));
1823 ret = gst_pad_check_pull_range (trans->sinkpad);
1825 gst_object_unref (trans);
1830 /* FIXME, getrange is broken, need to pull range from the other
1831 * end based on the transform_size result.
1833 static GstFlowReturn
1834 gst_base_transform_getrange (GstPad * pad, guint64 offset,
1835 guint length, GstBuffer ** buffer)
1837 GstBaseTransform *trans;
1838 GstBaseTransformClass *klass;
1842 trans = GST_BASE_TRANSFORM (gst_pad_get_parent (pad));
1844 ret = gst_pad_pull_range (trans->sinkpad, offset, length, &inbuf);
1845 if (G_UNLIKELY (ret != GST_FLOW_OK))
1848 klass = GST_BASE_TRANSFORM_GET_CLASS (trans);
1849 if (klass->before_transform)
1850 klass->before_transform (trans, inbuf);
1852 GST_BASE_TRANSFORM_LOCK (trans);
1853 ret = gst_base_transform_handle_buffer (trans, inbuf, buffer);
1854 GST_BASE_TRANSFORM_UNLOCK (trans);
1857 gst_object_unref (trans);
1864 GST_DEBUG_OBJECT (trans, "failed to pull a buffer: %s",
1865 gst_flow_get_name (ret));
1870 static GstFlowReturn
1871 gst_base_transform_chain (GstPad * pad, GstBuffer * buffer)
1873 GstBaseTransform *trans;
1874 GstBaseTransformClass *klass;
1876 GstClockTime position = GST_CLOCK_TIME_NONE;
1877 GstClockTime timestamp, duration;
1878 GstBuffer *outbuf = NULL;
1880 trans = GST_BASE_TRANSFORM (GST_OBJECT_PARENT (pad));
1882 timestamp = GST_BUFFER_TIMESTAMP (buffer);
1883 duration = GST_BUFFER_DURATION (buffer);
1885 /* calculate end position of the incoming buffer */
1886 if (timestamp != GST_CLOCK_TIME_NONE) {
1887 if (duration != GST_CLOCK_TIME_NONE)
1888 position = timestamp + duration;
1890 position = timestamp;
1893 klass = GST_BASE_TRANSFORM_GET_CLASS (trans);
1894 if (klass->before_transform)
1895 klass->before_transform (trans, buffer);
1897 /* protect transform method and concurrent buffer alloc */
1898 GST_BASE_TRANSFORM_LOCK (trans);
1899 ret = gst_base_transform_handle_buffer (trans, buffer, &outbuf);
1900 GST_BASE_TRANSFORM_UNLOCK (trans);
1902 /* outbuf can be NULL, this means a dropped buffer, if we have a buffer but
1903 * GST_BASE_TRANSFORM_FLOW_DROPPED we will not push either. */
1904 if (outbuf != NULL) {
1905 if ((ret == GST_FLOW_OK)) {
1906 GstClockTime position_out = GST_CLOCK_TIME_NONE;
1908 /* Remember last stop position */
1909 if (position != GST_CLOCK_TIME_NONE &&
1910 trans->segment.format == GST_FORMAT_TIME)
1911 trans->segment.position = position;
1913 if (GST_BUFFER_TIMESTAMP_IS_VALID (outbuf)) {
1914 position_out = GST_BUFFER_TIMESTAMP (outbuf);
1915 if (GST_BUFFER_DURATION_IS_VALID (outbuf))
1916 position_out += GST_BUFFER_DURATION (outbuf);
1917 } else if (position != GST_CLOCK_TIME_NONE) {
1918 position_out = position;
1920 if (position_out != GST_CLOCK_TIME_NONE
1921 && trans->segment.format == GST_FORMAT_TIME)
1922 trans->priv->position_out = position_out;
1924 /* apply DISCONT flag if the buffer is not yet marked as such */
1925 if (trans->priv->discont) {
1926 if (!GST_BUFFER_IS_DISCONT (outbuf)) {
1927 outbuf = gst_buffer_make_writable (outbuf);
1928 GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DISCONT);
1930 trans->priv->discont = FALSE;
1932 trans->priv->processed++;
1933 ret = gst_pad_push (trans->srcpad, outbuf);
1935 gst_buffer_unref (outbuf);
1939 /* convert internal flow to OK and mark discont for the next buffer. */
1940 if (ret == GST_BASE_TRANSFORM_FLOW_DROPPED) {
1941 trans->priv->discont = TRUE;
1949 gst_base_transform_set_property (GObject * object, guint prop_id,
1950 const GValue * value, GParamSpec * pspec)
1952 GstBaseTransform *trans;
1954 trans = GST_BASE_TRANSFORM (object);
1958 gst_base_transform_set_qos_enabled (trans, g_value_get_boolean (value));
1961 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
1967 gst_base_transform_get_property (GObject * object, guint prop_id,
1968 GValue * value, GParamSpec * pspec)
1970 GstBaseTransform *trans;
1972 trans = GST_BASE_TRANSFORM (object);
1976 g_value_set_boolean (value, gst_base_transform_is_qos_enabled (trans));
1979 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
1984 /* not a vmethod of anything, just an internal method */
1986 gst_base_transform_activate (GstBaseTransform * trans, gboolean active)
1988 GstBaseTransformClass *bclass;
1989 gboolean result = TRUE;
1991 bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
1994 GstCaps *incaps, *outcaps;
1996 if (trans->priv->pad_mode == GST_ACTIVATE_NONE && bclass->start)
1997 result &= bclass->start (trans);
1999 incaps = gst_pad_get_current_caps (trans->sinkpad);
2000 outcaps = gst_pad_get_current_caps (trans->srcpad);
2002 GST_OBJECT_LOCK (trans);
2003 if (incaps && outcaps)
2004 trans->have_same_caps =
2005 gst_caps_is_equal (incaps, outcaps) || trans->passthrough;
2007 trans->have_same_caps = trans->passthrough;
2008 GST_DEBUG_OBJECT (trans, "have_same_caps %d", trans->have_same_caps);
2009 trans->negotiated = FALSE;
2010 trans->have_segment = FALSE;
2011 gst_segment_init (&trans->segment, GST_FORMAT_UNDEFINED);
2012 trans->priv->position_out = GST_CLOCK_TIME_NONE;
2013 trans->priv->proportion = 1.0;
2014 trans->priv->earliest_time = -1;
2015 trans->priv->discont = FALSE;
2016 trans->priv->processed = 0;
2017 trans->priv->dropped = 0;
2018 GST_OBJECT_UNLOCK (trans);
2021 gst_caps_unref (incaps);
2023 gst_caps_unref (outcaps);
2025 /* We must make sure streaming has finished before resetting things
2026 * and calling the ::stop vfunc */
2027 GST_PAD_STREAM_LOCK (trans->sinkpad);
2028 GST_PAD_STREAM_UNLOCK (trans->sinkpad);
2030 trans->have_same_caps = FALSE;
2031 /* We can only reset the passthrough mode if the instance told us to
2032 handle it in configure_caps */
2033 if (bclass->passthrough_on_same_caps) {
2034 gst_base_transform_set_passthrough (trans, FALSE);
2036 gst_caps_replace (&trans->cache_caps1, NULL);
2037 gst_caps_replace (&trans->cache_caps2, NULL);
2039 if (trans->priv->pad_mode != GST_ACTIVATE_NONE && bclass->stop)
2040 result &= bclass->stop (trans);
2047 gst_base_transform_sink_activate_push (GstPad * pad, gboolean active)
2049 gboolean result = TRUE;
2050 GstBaseTransform *trans;
2052 trans = GST_BASE_TRANSFORM (gst_pad_get_parent (pad));
2054 result = gst_base_transform_activate (trans, active);
2057 trans->priv->pad_mode = active ? GST_ACTIVATE_PUSH : GST_ACTIVATE_NONE;
2059 gst_object_unref (trans);
2065 gst_base_transform_src_activate_pull (GstPad * pad, gboolean active)
2067 gboolean result = FALSE;
2068 GstBaseTransform *trans;
2070 trans = GST_BASE_TRANSFORM (gst_pad_get_parent (pad));
2072 result = gst_pad_activate_pull (trans->sinkpad, active);
2075 result &= gst_base_transform_activate (trans, active);
2078 trans->priv->pad_mode = active ? GST_ACTIVATE_PULL : GST_ACTIVATE_NONE;
2080 gst_object_unref (trans);
2086 * gst_base_transform_set_passthrough:
2087 * @trans: the #GstBaseTransform to set
2088 * @passthrough: boolean indicating passthrough mode.
2090 * Set passthrough mode for this filter by default. This is mostly
2091 * useful for filters that do not care about negotiation.
2093 * Always TRUE for filters which don't implement either a transform
2094 * or transform_ip method.
2099 gst_base_transform_set_passthrough (GstBaseTransform * trans,
2100 gboolean passthrough)
2102 GstBaseTransformClass *bclass;
2104 g_return_if_fail (GST_IS_BASE_TRANSFORM (trans));
2106 bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
2108 GST_OBJECT_LOCK (trans);
2109 if (passthrough == FALSE) {
2110 if (bclass->transform_ip || bclass->transform)
2111 trans->passthrough = FALSE;
2113 trans->passthrough = TRUE;
2116 GST_DEBUG_OBJECT (trans, "set passthrough %d", trans->passthrough);
2117 GST_OBJECT_UNLOCK (trans);
2121 * gst_base_transform_is_passthrough:
2122 * @trans: the #GstBaseTransform to query
2124 * See if @trans is configured as a passthrough transform.
2126 * Returns: TRUE is the transform is configured in passthrough mode.
2131 gst_base_transform_is_passthrough (GstBaseTransform * trans)
2135 g_return_val_if_fail (GST_IS_BASE_TRANSFORM (trans), FALSE);
2137 GST_OBJECT_LOCK (trans);
2138 result = trans->passthrough;
2139 GST_OBJECT_UNLOCK (trans);
2145 * gst_base_transform_set_in_place:
2146 * @trans: the #GstBaseTransform to modify
2147 * @in_place: Boolean value indicating that we would like to operate
2148 * on in_place buffers.
2150 * Determines whether a non-writable buffer will be copied before passing
2151 * to the transform_ip function.
2153 * <listitem>Always TRUE if no transform function is implemented.</listitem>
2154 * <listitem>Always FALSE if ONLY transform function is implemented.</listitem>
2160 gst_base_transform_set_in_place (GstBaseTransform * trans, gboolean in_place)
2162 GstBaseTransformClass *bclass;
2164 g_return_if_fail (GST_IS_BASE_TRANSFORM (trans));
2166 bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
2168 GST_OBJECT_LOCK (trans);
2171 if (bclass->transform_ip) {
2172 GST_DEBUG_OBJECT (trans, "setting in_place TRUE");
2173 trans->always_in_place = TRUE;
2176 if (bclass->transform) {
2177 GST_DEBUG_OBJECT (trans, "setting in_place FALSE");
2178 trans->always_in_place = FALSE;
2182 GST_OBJECT_UNLOCK (trans);
2186 * gst_base_transform_is_in_place:
2187 * @trans: the #GstBaseTransform to query
2189 * See if @trans is configured as a in_place transform.
2191 * Returns: TRUE is the transform is configured in in_place mode.
2196 gst_base_transform_is_in_place (GstBaseTransform * trans)
2200 g_return_val_if_fail (GST_IS_BASE_TRANSFORM (trans), FALSE);
2202 GST_OBJECT_LOCK (trans);
2203 result = trans->always_in_place;
2204 GST_OBJECT_UNLOCK (trans);
2210 * gst_base_transform_update_qos:
2211 * @trans: a #GstBaseTransform
2212 * @proportion: the proportion
2213 * @diff: the diff against the clock
2214 * @timestamp: the timestamp of the buffer generating the QoS expressed in
2217 * Set the QoS parameters in the transform. This function is called internally
2218 * when a QOS event is received but subclasses can provide custom information
2226 gst_base_transform_update_qos (GstBaseTransform * trans,
2227 gdouble proportion, GstClockTimeDiff diff, GstClockTime timestamp)
2230 g_return_if_fail (GST_IS_BASE_TRANSFORM (trans));
2232 GST_CAT_DEBUG_OBJECT (GST_CAT_QOS, trans,
2233 "qos: proportion: %lf, diff %" G_GINT64_FORMAT ", timestamp %"
2234 GST_TIME_FORMAT, proportion, diff, GST_TIME_ARGS (timestamp));
2236 GST_OBJECT_LOCK (trans);
2237 trans->priv->proportion = proportion;
2238 trans->priv->earliest_time = timestamp + diff;
2239 GST_OBJECT_UNLOCK (trans);
2243 * gst_base_transform_set_qos_enabled:
2244 * @trans: a #GstBaseTransform
2245 * @enabled: new state
2247 * Enable or disable QoS handling in the transform.
2254 gst_base_transform_set_qos_enabled (GstBaseTransform * trans, gboolean enabled)
2256 g_return_if_fail (GST_IS_BASE_TRANSFORM (trans));
2258 GST_CAT_DEBUG_OBJECT (GST_CAT_QOS, trans, "enabled: %d", enabled);
2260 GST_OBJECT_LOCK (trans);
2261 trans->priv->qos_enabled = enabled;
2262 GST_OBJECT_UNLOCK (trans);
2266 * gst_base_transform_is_qos_enabled:
2267 * @trans: a #GstBaseTransform
2269 * Queries if the transform will handle QoS.
2271 * Returns: TRUE if QoS is enabled.
2278 gst_base_transform_is_qos_enabled (GstBaseTransform * trans)
2282 g_return_val_if_fail (GST_IS_BASE_TRANSFORM (trans), FALSE);
2284 GST_OBJECT_LOCK (trans);
2285 result = trans->priv->qos_enabled;
2286 GST_OBJECT_UNLOCK (trans);
2292 * gst_base_transform_set_gap_aware:
2293 * @trans: a #GstBaseTransform
2294 * @gap_aware: New state
2296 * If @gap_aware is %FALSE (the default), output buffers will have the
2297 * %GST_BUFFER_FLAG_GAP flag unset.
2299 * If set to %TRUE, the element must handle output buffers with this flag set
2300 * correctly, i.e. it can assume that the buffer contains neutral data but must
2301 * unset the flag if the output is no neutral data.
2308 gst_base_transform_set_gap_aware (GstBaseTransform * trans, gboolean gap_aware)
2310 g_return_if_fail (GST_IS_BASE_TRANSFORM (trans));
2312 GST_OBJECT_LOCK (trans);
2313 trans->priv->gap_aware = gap_aware;
2314 GST_DEBUG_OBJECT (trans, "set gap aware %d", trans->priv->gap_aware);
2315 GST_OBJECT_UNLOCK (trans);
2319 * gst_base_transform_suggest:
2320 * @trans: a #GstBaseTransform
2321 * @caps: (transfer none): caps to suggest
2322 * @size: buffer size to suggest
2324 * Instructs @trans to suggest new @caps upstream. A copy of @caps will be
2330 gst_base_transform_suggest (GstBaseTransform * trans, GstCaps * caps,
2333 g_return_if_fail (GST_IS_BASE_TRANSFORM (trans));
2335 /* push the renegotiate event */
2336 if (!gst_pad_push_event (GST_BASE_TRANSFORM_SINK_PAD (trans),
2337 gst_event_new_reconfigure ()))
2338 GST_DEBUG_OBJECT (trans, "Renegotiate event wasn't handled");
2342 * gst_base_transform_reconfigure:
2343 * @trans: a #GstBaseTransform
2345 * Instructs @trans to renegotiate a new downstream transform on the next
2346 * buffer. This function is typically called after properties on the transform
2347 * were set that influence the output format.
2352 gst_base_transform_reconfigure (GstBaseTransform * trans)
2354 g_return_if_fail (GST_IS_BASE_TRANSFORM (trans));
2356 GST_OBJECT_LOCK (trans);
2357 GST_DEBUG_OBJECT (trans, "marking reconfigure");
2358 trans->priv->reconfigure = TRUE;
2359 GST_OBJECT_UNLOCK (trans);