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 "../../../gst/glib-compat-private.h"
211 #include "gstbasetransform.h"
212 #include <gst/gstmarshal.h>
214 GST_DEBUG_CATEGORY_STATIC (gst_base_transform_debug);
215 #define GST_CAT_DEFAULT gst_base_transform_debug
217 /* BaseTransform signals and args */
224 #define DEFAULT_PROP_QOS FALSE
232 #define GST_BASE_TRANSFORM_GET_PRIVATE(obj) \
233 (G_TYPE_INSTANCE_GET_PRIVATE ((obj), GST_TYPE_BASE_TRANSFORM, GstBaseTransformPrivate))
235 struct _GstBaseTransformPrivate
237 /* QoS *//* with LOCK */
238 gboolean qos_enabled;
240 GstClockTime earliest_time;
241 /* previous buffer had a discont */
248 gboolean reconfigure;
254 GstClockTime position_out;
257 GstAllocator *allocator;
263 static GstElementClass *parent_class = NULL;
265 static void gst_base_transform_class_init (GstBaseTransformClass * klass);
266 static void gst_base_transform_init (GstBaseTransform * trans,
267 GstBaseTransformClass * klass);
269 /* we can't use G_DEFINE_ABSTRACT_TYPE because we need the klass in the _init
270 * method to get to the padtemplates */
272 gst_base_transform_get_type (void)
274 static volatile gsize base_transform_type = 0;
276 if (g_once_init_enter (&base_transform_type)) {
278 static const GTypeInfo base_transform_info = {
279 sizeof (GstBaseTransformClass),
282 (GClassInitFunc) gst_base_transform_class_init,
285 sizeof (GstBaseTransform),
287 (GInstanceInitFunc) gst_base_transform_init,
290 _type = g_type_register_static (GST_TYPE_ELEMENT,
291 "GstBaseTransform", &base_transform_info, G_TYPE_FLAG_ABSTRACT);
292 g_once_init_leave (&base_transform_type, _type);
294 return base_transform_type;
297 static void gst_base_transform_finalize (GObject * object);
298 static void gst_base_transform_set_property (GObject * object, guint prop_id,
299 const GValue * value, GParamSpec * pspec);
300 static void gst_base_transform_get_property (GObject * object, guint prop_id,
301 GValue * value, GParamSpec * pspec);
302 static gboolean gst_base_transform_src_activate_mode (GstPad * pad,
303 GstObject * parent, GstPadMode mode, gboolean active);
304 static gboolean gst_base_transform_sink_activate_mode (GstPad * pad,
305 GstObject * parent, GstPadMode mode, gboolean active);
306 static gboolean gst_base_transform_activate (GstBaseTransform * trans,
308 static gboolean gst_base_transform_get_unit_size (GstBaseTransform * trans,
309 GstCaps * caps, gsize * size);
311 static gboolean gst_base_transform_src_event (GstPad * pad, GstObject * parent,
313 static gboolean gst_base_transform_src_eventfunc (GstBaseTransform * trans,
315 static gboolean gst_base_transform_sink_event (GstPad * pad, GstObject * parent,
317 static gboolean gst_base_transform_sink_eventfunc (GstBaseTransform * trans,
319 static GstFlowReturn gst_base_transform_getrange (GstPad * pad,
320 GstObject * parent, guint64 offset, guint length, GstBuffer ** buffer);
321 static GstFlowReturn gst_base_transform_chain (GstPad * pad, GstObject * parent,
323 static GstCaps *gst_base_transform_default_transform_caps (GstBaseTransform *
324 trans, GstPadDirection direction, GstCaps * caps, GstCaps * filter);
325 static GstCaps *gst_base_transform_default_fixate_caps (GstBaseTransform *
326 trans, GstPadDirection direction, GstCaps * caps, GstCaps * othercaps);
327 static GstCaps *gst_base_transform_query_caps (GstBaseTransform * trans,
328 GstPad * pad, GstCaps * filter);
329 static gboolean gst_base_transform_acceptcaps_default (GstBaseTransform * trans,
330 GstPadDirection direction, GstCaps * caps);
331 static gboolean gst_base_transform_setcaps (GstBaseTransform * trans,
332 GstPad * pad, GstCaps * caps);
333 static gboolean gst_base_transform_query (GstPad * pad, GstObject * parent,
335 static gboolean gst_base_transform_default_query (GstBaseTransform * trans,
336 GstPadDirection direction, GstQuery * query);
337 static gboolean gst_base_transform_default_transform_size (GstBaseTransform *
338 trans, GstPadDirection direction, GstCaps * caps, gsize size,
339 GstCaps * othercaps, gsize * othersize);
341 static GstFlowReturn default_prepare_output_buffer (GstBaseTransform * trans,
342 GstBuffer * inbuf, GstBuffer ** outbuf);
343 static gboolean default_copy_metadata (GstBaseTransform * trans,
344 GstBuffer * inbuf, GstBuffer * outbuf);
346 /* static guint gst_base_transform_signals[LAST_SIGNAL] = { 0 }; */
350 gst_base_transform_finalize (GObject * object)
352 GstBaseTransform *trans;
354 trans = GST_BASE_TRANSFORM (object);
356 g_mutex_clear (&trans->transform_lock);
358 G_OBJECT_CLASS (parent_class)->finalize (object);
362 gst_base_transform_class_init (GstBaseTransformClass * klass)
364 GObjectClass *gobject_class;
366 gobject_class = G_OBJECT_CLASS (klass);
368 GST_DEBUG_CATEGORY_INIT (gst_base_transform_debug, "basetransform", 0,
369 "basetransform element");
371 GST_DEBUG ("gst_base_transform_class_init");
373 g_type_class_add_private (klass, sizeof (GstBaseTransformPrivate));
375 parent_class = g_type_class_peek_parent (klass);
377 gobject_class->set_property = gst_base_transform_set_property;
378 gobject_class->get_property = gst_base_transform_get_property;
380 g_object_class_install_property (gobject_class, PROP_QOS,
381 g_param_spec_boolean ("qos", "QoS", "Handle Quality-of-Service events",
382 DEFAULT_PROP_QOS, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
384 gobject_class->finalize = gst_base_transform_finalize;
386 klass->passthrough_on_same_caps = FALSE;
388 klass->transform_caps =
389 GST_DEBUG_FUNCPTR (gst_base_transform_default_transform_caps);
391 GST_DEBUG_FUNCPTR (gst_base_transform_default_fixate_caps);
393 GST_DEBUG_FUNCPTR (gst_base_transform_acceptcaps_default);
394 klass->query = GST_DEBUG_FUNCPTR (gst_base_transform_default_query);
395 klass->transform_size =
396 GST_DEBUG_FUNCPTR (gst_base_transform_default_transform_size);
398 klass->sink_event = GST_DEBUG_FUNCPTR (gst_base_transform_sink_eventfunc);
399 klass->src_event = GST_DEBUG_FUNCPTR (gst_base_transform_src_eventfunc);
400 klass->prepare_output_buffer =
401 GST_DEBUG_FUNCPTR (default_prepare_output_buffer);
402 klass->copy_metadata = GST_DEBUG_FUNCPTR (default_copy_metadata);
406 gst_base_transform_init (GstBaseTransform * trans,
407 GstBaseTransformClass * bclass)
409 GstPadTemplate *pad_template;
411 GST_DEBUG ("gst_base_transform_init");
413 trans->priv = GST_BASE_TRANSFORM_GET_PRIVATE (trans);
416 gst_element_class_get_pad_template (GST_ELEMENT_CLASS (bclass), "sink");
417 g_return_if_fail (pad_template != NULL);
418 trans->sinkpad = gst_pad_new_from_template (pad_template, "sink");
419 gst_pad_set_event_function (trans->sinkpad,
420 GST_DEBUG_FUNCPTR (gst_base_transform_sink_event));
421 gst_pad_set_chain_function (trans->sinkpad,
422 GST_DEBUG_FUNCPTR (gst_base_transform_chain));
423 gst_pad_set_activatemode_function (trans->sinkpad,
424 GST_DEBUG_FUNCPTR (gst_base_transform_sink_activate_mode));
425 gst_pad_set_query_function (trans->sinkpad,
426 GST_DEBUG_FUNCPTR (gst_base_transform_query));
427 gst_element_add_pad (GST_ELEMENT (trans), trans->sinkpad);
430 gst_element_class_get_pad_template (GST_ELEMENT_CLASS (bclass), "src");
431 g_return_if_fail (pad_template != NULL);
432 trans->srcpad = gst_pad_new_from_template (pad_template, "src");
433 gst_pad_set_event_function (trans->srcpad,
434 GST_DEBUG_FUNCPTR (gst_base_transform_src_event));
435 gst_pad_set_getrange_function (trans->srcpad,
436 GST_DEBUG_FUNCPTR (gst_base_transform_getrange));
437 gst_pad_set_activatemode_function (trans->srcpad,
438 GST_DEBUG_FUNCPTR (gst_base_transform_src_activate_mode));
439 gst_pad_set_query_function (trans->srcpad,
440 GST_DEBUG_FUNCPTR (gst_base_transform_query));
441 gst_element_add_pad (GST_ELEMENT (trans), trans->srcpad);
443 g_mutex_init (&trans->transform_lock);
444 trans->priv->qos_enabled = DEFAULT_PROP_QOS;
445 trans->cache_caps1 = NULL;
446 trans->cache_caps2 = NULL;
447 trans->priv->pad_mode = GST_PAD_MODE_NONE;
448 trans->priv->gap_aware = FALSE;
450 trans->passthrough = FALSE;
451 if (bclass->transform == NULL) {
452 /* If no transform function, always_in_place is TRUE */
453 GST_DEBUG_OBJECT (trans, "setting in_place TRUE");
454 trans->always_in_place = TRUE;
456 if (bclass->transform_ip == NULL) {
457 GST_DEBUG_OBJECT (trans, "setting passthrough TRUE");
458 trans->passthrough = TRUE;
462 trans->priv->processed = 0;
463 trans->priv->dropped = 0;
467 gst_base_transform_default_transform_caps (GstBaseTransform * trans,
468 GstPadDirection direction, GstCaps * caps, GstCaps * filter)
472 GST_DEBUG_OBJECT (trans, "identity from: %" GST_PTR_FORMAT, caps);
473 /* no transform function, use the identity transform */
475 ret = gst_caps_intersect_full (filter, caps, GST_CAPS_INTERSECT_FIRST);
477 ret = gst_caps_ref (caps);
482 /* given @caps on the src or sink pad (given by @direction)
483 * calculate the possible caps on the other pad.
485 * Returns new caps, unref after usage.
488 gst_base_transform_transform_caps (GstBaseTransform * trans,
489 GstPadDirection direction, GstCaps * caps, GstCaps * filter)
492 GstBaseTransformClass *klass;
497 klass = GST_BASE_TRANSFORM_GET_CLASS (trans);
499 /* if there is a custom transform function, use this */
500 if (klass->transform_caps) {
501 GST_DEBUG_OBJECT (trans, "transform caps (direction = %d)", direction);
503 GST_LOG_OBJECT (trans, "from: %" GST_PTR_FORMAT, caps);
504 ret = klass->transform_caps (trans, direction, caps, filter);
505 GST_LOG_OBJECT (trans, " to: %" GST_PTR_FORMAT, ret);
507 #ifndef G_DISABLE_ASSERT
509 if (!gst_caps_is_subset (ret, filter)) {
510 GstCaps *intersection;
512 GST_ERROR_OBJECT (trans,
513 "transform_caps returned caps %" GST_PTR_FORMAT
514 " which are not a real subset of the filter caps %"
515 GST_PTR_FORMAT, ret, filter);
516 g_warning ("%s: transform_caps returned caps which are not a real "
517 "subset of the filter caps", GST_ELEMENT_NAME (trans));
520 gst_caps_intersect_full (filter, ret, GST_CAPS_INTERSECT_FIRST);
521 gst_caps_unref (ret);
528 GST_DEBUG_OBJECT (trans, "to: %" GST_PTR_FORMAT, ret);
534 gst_base_transform_default_transform_size (GstBaseTransform * trans,
535 GstPadDirection direction, GstCaps * caps, gsize size,
536 GstCaps * othercaps, gsize * othersize)
538 gsize inunitsize, outunitsize, units;
539 GstBaseTransformClass *klass;
541 klass = GST_BASE_TRANSFORM_GET_CLASS (trans);
543 if (klass->get_unit_size == NULL) {
544 /* if there is no transform_size and no unit_size, it means the
545 * element does not modify the size of a buffer */
548 /* there is no transform_size function, we have to use the unit_size
549 * functions. This method assumes there is a fixed unit_size associated with
550 * each caps. We provide the same amount of units on both sides. */
551 if (!gst_base_transform_get_unit_size (trans, caps, &inunitsize))
554 GST_DEBUG_OBJECT (trans,
555 "input size %" G_GSIZE_FORMAT ", input unit size %" G_GSIZE_FORMAT,
558 /* input size must be a multiple of the unit_size of the input caps */
559 if (inunitsize == 0 || (size % inunitsize != 0))
562 /* get the amount of units */
563 units = size / inunitsize;
565 /* now get the unit size of the output */
566 if (!gst_base_transform_get_unit_size (trans, othercaps, &outunitsize))
569 /* the output size is the unit_size times the amount of units on the
571 *othersize = units * outunitsize;
572 GST_DEBUG_OBJECT (trans, "transformed size to %" G_GSIZE_FORMAT,
580 GST_DEBUG_OBJECT (trans, "could not get in_size");
581 g_warning ("%s: could not get in_size", GST_ELEMENT_NAME (trans));
586 GST_DEBUG_OBJECT (trans, "Size %" G_GSIZE_FORMAT " is not a multiple of"
587 "unit size %" G_GSIZE_FORMAT, size, inunitsize);
588 g_warning ("%s: size %" G_GSIZE_FORMAT " is not a multiple of unit size %"
589 G_GSIZE_FORMAT, GST_ELEMENT_NAME (trans), size, inunitsize);
594 GST_DEBUG_OBJECT (trans, "could not get out_size");
595 g_warning ("%s: could not get out_size", GST_ELEMENT_NAME (trans));
600 /* transform a buffer of @size with @caps on the pad with @direction to
601 * the size of a buffer with @othercaps and store the result in @othersize
603 * We have two ways of doing this:
604 * 1) use a custom transform size function, this is for complicated custom
605 * cases with no fixed unit_size.
606 * 2) use the unit_size functions where there is a relationship between the
607 * caps and the size of a buffer.
610 gst_base_transform_transform_size (GstBaseTransform * trans,
611 GstPadDirection direction, GstCaps * caps,
612 gsize size, GstCaps * othercaps, gsize * othersize)
614 GstBaseTransformClass *klass;
615 gboolean ret = FALSE;
617 klass = GST_BASE_TRANSFORM_GET_CLASS (trans);
619 GST_DEBUG_OBJECT (trans,
620 "asked to transform size %" G_GSIZE_FORMAT " for caps %"
621 GST_PTR_FORMAT " to size for caps %" GST_PTR_FORMAT " in direction %s",
622 size, caps, othercaps, direction == GST_PAD_SRC ? "SRC" : "SINK");
624 if (klass->transform_size) {
625 /* if there is a custom transform function, use this */
626 ret = klass->transform_size (trans, direction, caps, size, othercaps,
632 /* get the caps that can be handled by @pad. We perform:
634 * - take the caps of peer of otherpad,
635 * - filter against the padtemplate of otherpad,
636 * - calculate all transforms of remaining caps
637 * - filter against template of @pad
639 * If there is no peer, we simply return the caps of the padtemplate of pad.
642 gst_base_transform_query_caps (GstBaseTransform * trans, GstPad * pad,
646 GstCaps *peercaps, *caps, *temp, *peerfilter = NULL;
649 otherpad = (pad == trans->srcpad) ? trans->sinkpad : trans->srcpad;
651 /* we can do what the peer can */
654 GST_DEBUG_OBJECT (pad, "filter caps %" GST_PTR_FORMAT, filter);
656 /* filtered against our padtemplate on the other side */
657 templ = gst_pad_get_pad_template_caps (pad);
658 GST_DEBUG_OBJECT (pad, "our template %" GST_PTR_FORMAT, templ);
659 temp = gst_caps_intersect_full (filter, templ, GST_CAPS_INTERSECT_FIRST);
660 GST_DEBUG_OBJECT (pad, "intersected %" GST_PTR_FORMAT, temp);
661 gst_caps_unref (templ);
663 /* then see what we can transform this to */
664 peerfilter = gst_base_transform_transform_caps (trans,
665 GST_PAD_DIRECTION (pad), temp, NULL);
666 GST_DEBUG_OBJECT (pad, "transformed %" GST_PTR_FORMAT, peerfilter);
667 gst_caps_unref (temp);
669 /* and filter against the template of this pad */
670 templ = gst_pad_get_pad_template_caps (otherpad);
671 GST_DEBUG_OBJECT (pad, "our template %" GST_PTR_FORMAT, templ);
672 /* We keep the caps sorted like the returned caps */
674 gst_caps_intersect_full (peerfilter, templ, GST_CAPS_INTERSECT_FIRST);
675 GST_DEBUG_OBJECT (pad, "intersected %" GST_PTR_FORMAT, temp);
676 gst_caps_unref (peerfilter);
677 gst_caps_unref (templ);
681 peercaps = gst_pad_peer_query_caps (otherpad, peerfilter);
684 gst_caps_unref (peerfilter);
687 GST_DEBUG_OBJECT (pad, "peer caps %" GST_PTR_FORMAT, peercaps);
689 /* filtered against our padtemplate on the other side */
690 templ = gst_pad_get_pad_template_caps (otherpad);
691 GST_DEBUG_OBJECT (pad, "our template %" GST_PTR_FORMAT, templ);
692 temp = gst_caps_intersect_full (peercaps, templ, GST_CAPS_INTERSECT_FIRST);
693 GST_DEBUG_OBJECT (pad, "intersected %" GST_PTR_FORMAT, temp);
694 gst_caps_unref (templ);
696 temp = gst_pad_get_pad_template_caps (otherpad);
699 /* then see what we can transform this to */
700 caps = gst_base_transform_transform_caps (trans,
701 GST_PAD_DIRECTION (otherpad), temp, filter);
702 GST_DEBUG_OBJECT (pad, "transformed %" GST_PTR_FORMAT, caps);
703 gst_caps_unref (temp);
708 /* and filter against the template of this pad */
709 templ = gst_pad_get_pad_template_caps (pad);
710 GST_DEBUG_OBJECT (pad, "our template %" GST_PTR_FORMAT, templ);
711 /* We keep the caps sorted like the returned caps */
712 temp = gst_caps_intersect_full (caps, templ, GST_CAPS_INTERSECT_FIRST);
713 GST_DEBUG_OBJECT (pad, "intersected %" GST_PTR_FORMAT, temp);
714 gst_caps_unref (caps);
715 gst_caps_unref (templ);
718 /* Now try if we can put the untransformed downstream caps first */
719 temp = gst_caps_intersect_full (peercaps, caps, GST_CAPS_INTERSECT_FIRST);
720 if (!gst_caps_is_empty (temp)) {
721 gst_caps_merge (temp, caps);
724 gst_caps_unref (temp);
727 gst_caps_unref (caps);
728 /* no peer or the peer can do anything, our padtemplate is enough then */
729 caps = gst_pad_get_pad_template_caps (pad);
734 temp = gst_caps_intersect_full (filter, caps, GST_CAPS_INTERSECT_FIRST);
735 gst_caps_unref (caps);
741 GST_DEBUG_OBJECT (trans, "returning %" GST_PTR_FORMAT, caps);
744 gst_caps_unref (peercaps);
749 /* takes ownership of the pool and allocator */
751 gst_base_transform_set_allocation (GstBaseTransform * trans,
752 GstBufferPool * pool, GstAllocator * allocator, guint prefix,
755 GstAllocator *oldalloc;
756 GstBufferPool *oldpool;
757 GstBaseTransformPrivate *priv = trans->priv;
761 GST_DEBUG_OBJECT (trans, "setting pool %p active", pool);
762 if (!gst_buffer_pool_set_active (pool, TRUE))
763 goto activate_failed;
766 GST_OBJECT_LOCK (trans);
767 oldpool = priv->pool;
769 oldalloc = priv->allocator;
770 priv->allocator = allocator;
771 priv->prefix = prefix;
772 priv->alignment = alignment;
773 GST_OBJECT_UNLOCK (trans);
776 GST_DEBUG_OBJECT (trans, "deactivating old pool %p", oldpool);
777 gst_buffer_pool_set_active (oldpool, FALSE);
778 gst_object_unref (oldpool);
781 gst_allocator_unref (oldalloc);
788 GST_ERROR_OBJECT (trans, "failed to activate bufferpool.");
794 gst_base_transform_do_bufferpool (GstBaseTransform * trans, GstCaps * outcaps)
797 gboolean result = TRUE;
798 GstBufferPool *pool = NULL, *oldpool;
799 guint size, min, max, prefix, alignment;
800 GstBaseTransformClass *klass;
801 GstAllocator *allocator = NULL;
803 /* there are these possibilities:
805 * 1) we negotiated passthrough, we can proxy the bufferpool directly and we
806 * will do that whenever some upstream does an allocation query.
807 * 2) we need to do a transform, we need to get a bufferpool from downstream
808 * and configure it. When upstream does the ALLOCATION query, the
809 * propose_allocation vmethod will be called and we will configure the
810 * upstream allocator with our porposed values then.
814 oldpool = trans->priv->pool;
816 GST_DEBUG_OBJECT (trans, "unreffing old pool");
817 gst_buffer_pool_set_active (oldpool, FALSE);
818 gst_object_unref (oldpool);
819 trans->priv->pool = oldpool = NULL;
822 if (trans->passthrough || trans->always_in_place) {
823 /* we are in passthrough, the input buffer is never copied and always passed
824 * along. We never allocate an output buffer on the srcpad. What we do is
825 * let the upstream element decide if it wants to use a bufferpool and
826 * then we will proxy the downstream pool */
827 GST_DEBUG_OBJECT (trans, "we're passthough, delay bufferpool");
831 /* not passthrough, we need to allocate */
832 /* find a pool for the negotiated caps now */
833 GST_DEBUG_OBJECT (trans, "doing allocation query");
834 query = gst_query_new_allocation (outcaps, TRUE);
835 if (!gst_pad_peer_query (trans->srcpad, query)) {
836 /* not a problem, just debug a little */
837 GST_DEBUG_OBJECT (trans, "peer ALLOCATION query failed");
840 klass = GST_BASE_TRANSFORM_GET_CLASS (trans);
842 GST_DEBUG_OBJECT (trans, "calling decide_allocation");
843 if (G_LIKELY (klass->decide_allocation))
844 if ((result = klass->decide_allocation (trans, query)) == FALSE)
845 goto no_decide_allocation;
847 /* we got configuration from our peer, parse them */
848 gst_query_parse_allocation_params (query, &size, &min, &max, &prefix,
852 /* no size, we have variable size buffers */
853 if (gst_query_get_n_allocation_memories (query) > 0) {
854 if ((allocator = gst_query_parse_nth_allocation_memory (query, 0)))
855 gst_allocator_ref (allocator);
857 GST_DEBUG_OBJECT (trans, "no size, using allocator %p", allocator);
858 } else if (pool == NULL) {
859 GstStructure *config;
861 /* we did not get a pool, make one ourselves then */
862 pool = gst_buffer_pool_new ();
864 GST_DEBUG_OBJECT (trans, "no pool, making one");
865 config = gst_buffer_pool_get_config (pool);
866 gst_buffer_pool_config_set (config, outcaps, size, min, max, prefix,
868 gst_buffer_pool_set_config (pool, config);
871 gst_query_unref (query);
875 gst_base_transform_set_allocation (trans, pool, allocator, prefix,
881 no_decide_allocation:
883 GST_WARNING_OBJECT (trans, "Subclass failed to decide allocation");
884 gst_query_unref (query);
890 /* function triggered when the in and out caps are negotiated and need
891 * to be configured in the subclass. */
893 gst_base_transform_configure_caps (GstBaseTransform * trans, GstCaps * in,
897 GstBaseTransformClass *klass;
899 klass = GST_BASE_TRANSFORM_GET_CLASS (trans);
901 GST_DEBUG_OBJECT (trans, "in caps: %" GST_PTR_FORMAT, in);
902 GST_DEBUG_OBJECT (trans, "out caps: %" GST_PTR_FORMAT, out);
904 /* clear the cache */
905 gst_caps_replace (&trans->cache_caps1, NULL);
906 gst_caps_replace (&trans->cache_caps2, NULL);
908 /* figure out same caps state */
909 trans->have_same_caps = gst_caps_is_equal (in, out);
910 GST_DEBUG_OBJECT (trans, "have_same_caps: %d", trans->have_same_caps);
912 /* If we've a transform_ip method and same input/output caps, set in_place
913 * by default. If for some reason the sub-class prefers using a transform
914 * function, it can clear the in place flag in the set_caps */
915 gst_base_transform_set_in_place (trans,
916 klass->transform_ip && trans->have_same_caps);
918 /* Set the passthrough if the class wants passthrough_on_same_caps
919 * and we have the same caps on each pad */
920 if (klass->passthrough_on_same_caps)
921 gst_base_transform_set_passthrough (trans, trans->have_same_caps);
923 /* now configure the element with the caps */
924 if (klass->set_caps) {
925 GST_DEBUG_OBJECT (trans, "Calling set_caps method to setup caps");
926 ret = klass->set_caps (trans, in, out);
929 trans->negotiated = ret;
935 gst_base_transform_default_fixate_caps (GstBaseTransform * trans,
936 GstPadDirection direction, GstCaps * caps, GstCaps * othercaps)
938 othercaps = gst_caps_make_writable (othercaps);
939 gst_caps_fixate (othercaps);
940 GST_DEBUG_OBJECT (trans, "fixated to %" GST_PTR_FORMAT, othercaps);
945 /* given a fixed @caps on @pad, create the best possible caps for the
947 * @caps must be fixed when calling this function.
949 * This function calls the transform caps vmethod of the basetransform to figure
950 * out the possible target formats. It then tries to select the best format from
953 * - attempt passthrough if the target caps is a superset of the input caps
954 * - fixating by using peer caps
955 * - fixating with transform fixate function
956 * - fixating with pad fixate functions.
958 * this function returns a caps that can be transformed into and is accepted by
962 gst_base_transform_find_transform (GstBaseTransform * trans, GstPad * pad,
965 GstBaseTransformClass *klass;
966 GstPad *otherpad, *otherpeer;
970 /* caps must be fixed here, this is a programming error if it's not */
971 g_return_val_if_fail (gst_caps_is_fixed (caps), NULL);
973 klass = GST_BASE_TRANSFORM_GET_CLASS (trans);
975 otherpad = (pad == trans->srcpad) ? trans->sinkpad : trans->srcpad;
976 otherpeer = gst_pad_get_peer (otherpad);
978 /* see how we can transform the input caps. We need to do this even for
979 * passthrough because it might be possible that this element cannot support
980 * passthrough at all. */
981 othercaps = gst_base_transform_transform_caps (trans,
982 GST_PAD_DIRECTION (pad), caps, NULL);
984 /* The caps we can actually output is the intersection of the transformed
985 * caps with the pad template for the pad */
987 GstCaps *intersect, *templ_caps;
989 templ_caps = gst_pad_get_pad_template_caps (otherpad);
990 GST_DEBUG_OBJECT (trans,
991 "intersecting against padtemplate %" GST_PTR_FORMAT, templ_caps);
994 gst_caps_intersect_full (othercaps, templ_caps,
995 GST_CAPS_INTERSECT_FIRST);
997 gst_caps_unref (othercaps);
998 gst_caps_unref (templ_caps);
999 othercaps = intersect;
1002 /* check if transform is empty */
1003 if (!othercaps || gst_caps_is_empty (othercaps))
1006 /* if the othercaps are not fixed, we need to fixate them, first attempt
1007 * is by attempting passthrough if the othercaps are a superset of caps. */
1008 /* FIXME. maybe the caps is not fixed because it has multiple structures of
1010 is_fixed = gst_caps_is_fixed (othercaps);
1012 GST_DEBUG_OBJECT (trans,
1013 "transform returned non fixed %" GST_PTR_FORMAT, othercaps);
1015 /* Now let's see what the peer suggests based on our transformed caps */
1017 GstCaps *peercaps, *intersection, *templ_caps;
1019 GST_DEBUG_OBJECT (trans,
1020 "Checking peer caps with filter %" GST_PTR_FORMAT, othercaps);
1022 peercaps = gst_pad_query_caps (otherpeer, othercaps);
1023 GST_DEBUG_OBJECT (trans, "Resulted in %" GST_PTR_FORMAT, peercaps);
1024 if (!gst_caps_is_empty (peercaps)) {
1025 templ_caps = gst_pad_get_pad_template_caps (otherpad);
1027 GST_DEBUG_OBJECT (trans,
1028 "Intersecting with template caps %" GST_PTR_FORMAT, templ_caps);
1031 gst_caps_intersect_full (peercaps, templ_caps,
1032 GST_CAPS_INTERSECT_FIRST);
1033 GST_DEBUG_OBJECT (trans, "Intersection: %" GST_PTR_FORMAT,
1035 gst_caps_unref (peercaps);
1036 gst_caps_unref (templ_caps);
1037 peercaps = intersection;
1039 GST_DEBUG_OBJECT (trans,
1040 "Intersecting with transformed caps %" GST_PTR_FORMAT, othercaps);
1042 gst_caps_intersect_full (peercaps, othercaps,
1043 GST_CAPS_INTERSECT_FIRST);
1044 GST_DEBUG_OBJECT (trans, "Intersection: %" GST_PTR_FORMAT,
1046 gst_caps_unref (peercaps);
1047 gst_caps_unref (othercaps);
1048 othercaps = intersection;
1050 othercaps = peercaps;
1053 is_fixed = gst_caps_is_fixed (othercaps);
1055 GST_DEBUG_OBJECT (trans, "no peer, doing passthrough");
1056 gst_caps_unref (othercaps);
1057 othercaps = gst_caps_ref (caps);
1061 if (gst_caps_is_empty (othercaps))
1062 goto no_transform_possible;
1064 GST_DEBUG ("have %sfixed caps %" GST_PTR_FORMAT, (is_fixed ? "" : "non-"),
1067 /* second attempt at fixation, call the fixate vmethod */
1068 /* caps could be fixed but the subclass may want to add fields */
1069 if (klass->fixate_caps) {
1070 GST_DEBUG_OBJECT (trans, "calling fixate_caps for %" GST_PTR_FORMAT
1071 " using caps %" GST_PTR_FORMAT " on pad %s:%s", othercaps, caps,
1072 GST_DEBUG_PAD_NAME (otherpad));
1073 /* note that we pass the complete array of structures to the fixate
1074 * function, it needs to truncate itself */
1076 klass->fixate_caps (trans, GST_PAD_DIRECTION (pad), caps, othercaps);
1077 is_fixed = gst_caps_is_fixed (othercaps);
1078 GST_DEBUG_OBJECT (trans, "after fixating %" GST_PTR_FORMAT, othercaps);
1081 /* caps should be fixed now, if not we have to fail. */
1083 goto could_not_fixate;
1085 /* and peer should accept */
1086 if (otherpeer && !gst_pad_query_accept_caps (otherpeer, othercaps))
1087 goto peer_no_accept;
1089 GST_DEBUG_OBJECT (trans, "Input caps were %" GST_PTR_FORMAT
1090 ", and got final caps %" GST_PTR_FORMAT, caps, othercaps);
1093 gst_object_unref (otherpeer);
1100 GST_DEBUG_OBJECT (trans,
1101 "transform returned useless %" GST_PTR_FORMAT, othercaps);
1104 no_transform_possible:
1106 GST_DEBUG_OBJECT (trans,
1107 "transform could not transform %" GST_PTR_FORMAT
1108 " in anything we support", caps);
1113 GST_DEBUG_OBJECT (trans, "FAILED to fixate %" GST_PTR_FORMAT, othercaps);
1118 GST_DEBUG_OBJECT (trans, "FAILED to get peer of %" GST_PTR_FORMAT
1119 " to accept %" GST_PTR_FORMAT, otherpad, othercaps);
1125 gst_object_unref (otherpeer);
1127 gst_caps_unref (othercaps);
1133 gst_base_transform_acceptcaps_default (GstBaseTransform * trans,
1134 GstPadDirection direction, GstCaps * caps)
1138 GstCaps *othercaps = NULL;
1140 gboolean ret = TRUE;
1143 otherpad = (pad == trans->srcpad) ? trans->sinkpad : trans->srcpad;
1145 /* we need fixed caps for the check, fall back to the default implementation
1147 if (!gst_caps_is_fixed (caps))
1152 GST_DEBUG_OBJECT (trans, "non fixed accept caps %" GST_PTR_FORMAT, caps);
1154 /* get all the formats we can handle on this pad */
1155 if (direction == GST_PAD_SRC)
1156 allowed = gst_pad_query_caps (trans->srcpad, NULL);
1158 allowed = gst_pad_query_caps (trans->sinkpad, NULL);
1161 GST_DEBUG_OBJECT (trans, "gst_pad_query_caps() failed");
1162 goto no_transform_possible;
1165 GST_DEBUG_OBJECT (trans, "allowed caps %" GST_PTR_FORMAT, allowed);
1167 /* intersect with the requested format */
1168 ret = gst_caps_is_subset (caps, allowed);
1169 gst_caps_unref (allowed);
1172 goto no_transform_possible;
1176 GST_DEBUG_OBJECT (pad, "accept caps %" GST_PTR_FORMAT, caps);
1178 /* find best possible caps for the other pad as a way to see if we can
1179 * transform this caps. */
1180 othercaps = gst_base_transform_find_transform (trans, pad, caps, FALSE);
1181 if (!othercaps || gst_caps_is_empty (othercaps))
1182 goto no_transform_possible;
1184 GST_DEBUG_OBJECT (pad, "we can transform to %" GST_PTR_FORMAT, othercaps);
1190 /* We know it's always NULL since we never use it */
1192 gst_caps_unref (othercaps);
1198 no_transform_possible:
1200 GST_DEBUG_OBJECT (trans,
1201 "transform could not transform %" GST_PTR_FORMAT
1202 " in anything we support", caps);
1208 /* called when new caps arrive on the sink or source pad,
1209 * We try to find the best caps for the other side using our _find_transform()
1210 * function. If there are caps, we configure the transform for this new
1213 * FIXME, this function is currently commutative but this should not really be
1214 * because we never set caps starting from the srcpad.
1217 gst_base_transform_setcaps (GstBaseTransform * trans, GstPad * pad,
1220 GstPad *otherpad, *otherpeer;
1221 GstCaps *othercaps = NULL;
1222 gboolean ret = TRUE;
1223 GstCaps *incaps, *outcaps;
1225 otherpad = (pad == trans->srcpad) ? trans->sinkpad : trans->srcpad;
1226 otherpeer = gst_pad_get_peer (otherpad);
1228 GST_DEBUG_OBJECT (pad, "have new caps %p %" GST_PTR_FORMAT, caps, caps);
1230 /* find best possible caps for the other pad */
1231 othercaps = gst_base_transform_find_transform (trans, pad, caps);
1232 if (!othercaps || gst_caps_is_empty (othercaps))
1233 goto no_transform_possible;
1235 /* configure the element now */
1236 /* make sure in and out caps are correct */
1237 if (pad == trans->sinkpad) {
1239 outcaps = othercaps;
1245 /* if we have the same caps, we can optimize and reuse the input caps */
1246 if (gst_caps_is_equal (incaps, outcaps)) {
1247 GST_INFO_OBJECT (trans, "reuse caps");
1248 gst_caps_unref (othercaps);
1249 outcaps = othercaps = gst_caps_ref (incaps);
1252 /* call configure now */
1253 if (!(ret = gst_base_transform_configure_caps (trans, incaps, outcaps)))
1254 goto failed_configure;
1256 GST_OBJECT_LOCK (trans->sinkpad);
1257 GST_OBJECT_FLAG_UNSET (trans->srcpad, GST_PAD_FLAG_NEED_RECONFIGURE);
1258 trans->priv->reconfigure = FALSE;
1259 GST_OBJECT_UNLOCK (trans->sinkpad);
1261 /* we know this will work, we implement the setcaps */
1262 gst_pad_push_event (otherpad, gst_event_new_caps (othercaps));
1264 if (pad == trans->srcpad && trans->priv->pad_mode == GST_PAD_MODE_PULL) {
1266 ret &= gst_pad_push_event (otherpeer, gst_event_new_caps (othercaps));
1268 GST_INFO_OBJECT (trans, "otherpeer setcaps(%" GST_PTR_FORMAT ") failed",
1274 /* try to get a pool when needed */
1275 ret = gst_base_transform_do_bufferpool (trans, othercaps);
1280 gst_object_unref (otherpeer);
1282 gst_caps_unref (othercaps);
1284 trans->negotiated = ret;
1289 no_transform_possible:
1291 GST_WARNING_OBJECT (trans,
1292 "transform could not transform %" GST_PTR_FORMAT
1293 " in anything we support", caps);
1299 GST_WARNING_OBJECT (trans, "FAILED to configure caps %" GST_PTR_FORMAT
1300 " to accept %" GST_PTR_FORMAT, otherpad, othercaps);
1307 gst_base_transform_default_query (GstBaseTransform * trans,
1308 GstPadDirection direction, GstQuery * query)
1310 gboolean ret = FALSE;
1311 GstPad *pad, *otherpad;
1312 GstBaseTransformClass *klass;
1314 if (direction == GST_PAD_SRC) {
1315 pad = trans->srcpad;
1316 otherpad = trans->sinkpad;
1318 pad = trans->sinkpad;
1319 otherpad = trans->srcpad;
1322 klass = GST_BASE_TRANSFORM_GET_CLASS (trans);
1324 switch (GST_QUERY_TYPE (query)) {
1325 case GST_QUERY_ALLOCATION:
1327 gboolean passthrough;
1329 /* can only be done on the sinkpad */
1330 if (direction != GST_PAD_SINK)
1333 GST_BASE_TRANSFORM_LOCK (trans);
1334 passthrough = trans->passthrough;
1335 GST_BASE_TRANSFORM_UNLOCK (trans);
1337 GST_DEBUG_OBJECT (trans, "propose allocation values");
1338 /* pass the query to the propose_allocation vmethod if any */
1339 if (G_LIKELY (klass->propose_allocation)) {
1340 ret = klass->propose_allocation (trans, query);
1341 } else if (passthrough) {
1342 GST_DEBUG_OBJECT (trans, "doing passthrough query");
1343 ret = gst_pad_peer_query (otherpad, query);
1347 GST_DEBUG_OBJECT (trans, "ALLOCATION ret %d, %" GST_PTR_FORMAT, ret,
1351 case GST_QUERY_POSITION:
1355 gst_query_parse_position (query, &format, NULL);
1356 if (format == GST_FORMAT_TIME && trans->segment.format == GST_FORMAT_TIME) {
1360 if ((direction == GST_PAD_SINK)
1361 || (trans->priv->position_out == GST_CLOCK_TIME_NONE)) {
1363 gst_segment_to_stream_time (&trans->segment, GST_FORMAT_TIME,
1364 trans->segment.position);
1366 pos = gst_segment_to_stream_time (&trans->segment, GST_FORMAT_TIME,
1367 trans->priv->position_out);
1369 gst_query_set_position (query, format, pos);
1371 ret = gst_pad_peer_query (otherpad, query);
1375 case GST_QUERY_ACCEPT_CAPS:
1379 gst_query_parse_accept_caps (query, &caps);
1380 if (klass->accept_caps) {
1381 ret = klass->accept_caps (trans, direction, caps);
1382 gst_query_set_accept_caps_result (query, ret);
1383 /* return TRUE, we answered the query */
1388 case GST_QUERY_CAPS:
1390 GstCaps *filter, *caps;
1392 gst_query_parse_caps (query, &filter);
1393 caps = gst_base_transform_query_caps (trans, pad, filter);
1394 gst_query_set_caps_result (query, caps);
1395 gst_caps_unref (caps);
1400 ret = gst_pad_peer_query (otherpad, query);
1409 gst_base_transform_query (GstPad * pad, GstObject * parent, GstQuery * query)
1411 GstBaseTransform *trans;
1412 GstBaseTransformClass *bclass;
1413 gboolean ret = FALSE;
1415 trans = GST_BASE_TRANSFORM (parent);
1416 bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
1419 ret = bclass->query (trans, GST_PAD_DIRECTION (pad), query);
1424 /* this function either returns the input buffer without incrementing the
1425 * refcount or it allocates a new (writable) buffer */
1426 static GstFlowReturn
1427 default_prepare_output_buffer (GstBaseTransform * trans,
1428 GstBuffer * inbuf, GstBuffer ** outbuf)
1430 GstBaseTransformPrivate *priv;
1431 GstFlowReturn ret = GST_FLOW_OK;
1432 GstBaseTransformClass *bclass;
1433 GstCaps *incaps, *outcaps;
1434 gsize insize, outsize;
1438 bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
1440 /* figure out how to allocate an output buffer */
1441 if (trans->passthrough) {
1442 /* passthrough, we will not modify the incomming buffer so we can just
1444 GST_DEBUG_OBJECT (trans, "passthrough: reusing input buffer");
1449 /* we can't reuse the input buffer */
1451 GST_DEBUG_OBJECT (trans, "using pool alloc");
1452 ret = gst_buffer_pool_acquire_buffer (priv->pool, outbuf, NULL);
1456 /* no pool, we need to figure out the size of the output buffer first */
1457 if ((bclass->transform_ip != NULL) && trans->always_in_place) {
1458 /* we want to do an in-place alloc */
1459 if (gst_buffer_is_writable (inbuf)) {
1460 GST_DEBUG_OBJECT (trans, "inplace reuse writable input buffer");
1463 GST_DEBUG_OBJECT (trans, "making writable buffer copy");
1464 /* we make a copy of the input buffer */
1465 *outbuf = gst_buffer_copy (inbuf);
1470 /* else use the transform function to get the size */
1471 incaps = gst_pad_get_current_caps (trans->sinkpad);
1472 outcaps = gst_pad_get_current_caps (trans->srcpad);
1474 GST_DEBUG_OBJECT (trans, "getting output size for alloc");
1475 /* copy transform, figure out the output size */
1476 insize = gst_buffer_get_size (inbuf);
1477 res = gst_base_transform_transform_size (trans,
1478 GST_PAD_SINK, incaps, insize, outcaps, &outsize);
1480 gst_caps_unref (incaps);
1481 gst_caps_unref (outcaps);
1486 GST_DEBUG_OBJECT (trans, "doing alloc of size %" G_GSIZE_FORMAT, outsize);
1487 *outbuf = gst_buffer_new_allocate (priv->allocator, outsize, priv->alignment);
1490 /* copy the metadata */
1491 if (bclass->copy_metadata)
1492 if (!bclass->copy_metadata (trans, inbuf, *outbuf)) {
1493 /* something failed, post a warning */
1494 GST_ELEMENT_WARNING (trans, STREAM, NOT_IMPLEMENTED,
1495 ("could not copy metadata"), (NULL));
1504 GST_ERROR_OBJECT (trans, "unknown output size");
1505 return GST_FLOW_ERROR;
1510 default_copy_metadata (GstBaseTransform * trans,
1511 GstBuffer * inbuf, GstBuffer * outbuf)
1513 GstBaseTransformPrivate *priv = trans->priv;
1515 /* now copy the metadata */
1516 GST_DEBUG_OBJECT (trans, "copying metadata");
1518 /* this should not happen, buffers allocated from a pool or with
1519 * new_allocate should always be writable. */
1520 if (!gst_buffer_is_writable (outbuf))
1523 /* when we get here, the metadata should be writable */
1524 gst_buffer_copy_into (outbuf, inbuf,
1525 GST_BUFFER_COPY_FLAGS | GST_BUFFER_COPY_TIMESTAMPS, 0, -1);
1527 /* clear the GAP flag when the subclass does not understand it */
1528 if (!priv->gap_aware)
1529 GST_BUFFER_FLAG_UNSET (outbuf, GST_BUFFER_FLAG_GAP);
1536 GST_WARNING_OBJECT (trans, "buffer %p not writable", outbuf);
1541 /* Given @caps calcultate the size of one unit.
1543 * For video caps, this is the size of one frame (and thus one buffer).
1544 * For audio caps, this is the size of one sample.
1546 * These values are cached since they do not change and the calculation
1547 * potentially involves parsing caps and other expensive stuff.
1549 * We have two cache locations to store the size, one for the source caps
1550 * and one for the sink caps.
1552 * this function returns FALSE if no size could be calculated.
1555 gst_base_transform_get_unit_size (GstBaseTransform * trans, GstCaps * caps,
1558 gboolean res = FALSE;
1559 GstBaseTransformClass *bclass;
1561 /* see if we have the result cached */
1562 if (trans->cache_caps1 == caps) {
1563 *size = trans->cache_caps1_size;
1564 GST_DEBUG_OBJECT (trans,
1565 "returned %" G_GSIZE_FORMAT " from first cache", *size);
1568 if (trans->cache_caps2 == caps) {
1569 *size = trans->cache_caps2_size;
1570 GST_DEBUG_OBJECT (trans,
1571 "returned %" G_GSIZE_FORMAT " from second cached", *size);
1575 bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
1576 res = bclass->get_unit_size (trans, caps, size);
1577 GST_DEBUG_OBJECT (trans,
1578 "caps %" GST_PTR_FORMAT ") has unit size %" G_GSIZE_FORMAT ", res %s",
1579 caps, *size, res ? "TRUE" : "FALSE");
1582 /* and cache the values */
1583 if (trans->cache_caps1 == NULL) {
1584 gst_caps_replace (&trans->cache_caps1, caps);
1585 trans->cache_caps1_size = *size;
1586 GST_DEBUG_OBJECT (trans,
1587 "caching %" G_GSIZE_FORMAT " in first cache", *size);
1588 } else if (trans->cache_caps2 == NULL) {
1589 gst_caps_replace (&trans->cache_caps2, caps);
1590 trans->cache_caps2_size = *size;
1591 GST_DEBUG_OBJECT (trans,
1592 "caching %" G_GSIZE_FORMAT " in second cache", *size);
1594 GST_DEBUG_OBJECT (trans, "no free spot to cache unit_size");
1601 gst_base_transform_sink_event (GstPad * pad, GstObject * parent,
1604 GstBaseTransform *trans;
1605 GstBaseTransformClass *bclass;
1606 gboolean ret = TRUE;
1608 trans = GST_BASE_TRANSFORM (parent);
1609 bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
1611 if (bclass->sink_event)
1612 ret = bclass->sink_event (trans, event);
1614 gst_event_unref (event);
1620 gst_base_transform_sink_eventfunc (GstBaseTransform * trans, GstEvent * event)
1622 gboolean ret = TRUE, forward = TRUE;
1624 switch (GST_EVENT_TYPE (event)) {
1625 case GST_EVENT_FLUSH_START:
1627 case GST_EVENT_FLUSH_STOP:
1628 GST_OBJECT_LOCK (trans);
1629 /* reset QoS parameters */
1630 trans->priv->proportion = 1.0;
1631 trans->priv->earliest_time = -1;
1632 trans->priv->discont = FALSE;
1633 trans->priv->processed = 0;
1634 trans->priv->dropped = 0;
1635 GST_OBJECT_UNLOCK (trans);
1636 /* we need new segment info after the flush. */
1637 trans->have_segment = FALSE;
1638 gst_segment_init (&trans->segment, GST_FORMAT_UNDEFINED);
1639 trans->priv->position_out = GST_CLOCK_TIME_NONE;
1645 case GST_EVENT_CAPS:
1649 gst_event_parse_caps (event, &caps);
1650 ret = gst_base_transform_setcaps (trans, trans->sinkpad, caps);
1655 case GST_EVENT_SEGMENT:
1657 gst_event_copy_segment (event, &trans->segment);
1658 trans->have_segment = TRUE;
1660 GST_DEBUG_OBJECT (trans, "received SEGMENT %" GST_SEGMENT_FORMAT,
1669 ret = gst_pad_push_event (trans->srcpad, event);
1671 gst_event_unref (event);
1677 gst_base_transform_src_event (GstPad * pad, GstObject * parent,
1680 GstBaseTransform *trans;
1681 GstBaseTransformClass *bclass;
1682 gboolean ret = TRUE;
1684 trans = GST_BASE_TRANSFORM (parent);
1685 bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
1687 if (bclass->src_event)
1688 ret = bclass->src_event (trans, event);
1690 gst_event_unref (event);
1696 gst_base_transform_src_eventfunc (GstBaseTransform * trans, GstEvent * event)
1700 GST_DEBUG_OBJECT (trans, "handling event %p %" GST_PTR_FORMAT, event, event);
1702 switch (GST_EVENT_TYPE (event)) {
1703 case GST_EVENT_SEEK:
1705 case GST_EVENT_NAVIGATION:
1710 GstClockTimeDiff diff;
1711 GstClockTime timestamp;
1713 gst_event_parse_qos (event, NULL, &proportion, &diff, ×tamp);
1714 gst_base_transform_update_qos (trans, proportion, diff, timestamp);
1721 ret = gst_pad_push_event (trans->sinkpad, event);
1726 /* perform a transform on @inbuf and put the result in @outbuf.
1728 * This function is common to the push and pull-based operations.
1730 * This function takes ownership of @inbuf */
1731 static GstFlowReturn
1732 gst_base_transform_handle_buffer (GstBaseTransform * trans, GstBuffer * inbuf,
1733 GstBuffer ** outbuf)
1735 GstBaseTransformClass *bclass;
1736 GstFlowReturn ret = GST_FLOW_OK;
1737 gboolean want_in_place;
1738 GstClockTime running_time;
1739 GstClockTime timestamp;
1740 gboolean reconfigure;
1742 bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
1744 GST_OBJECT_LOCK (trans->sinkpad);
1745 reconfigure = GST_PAD_NEEDS_RECONFIGURE (trans->srcpad)
1746 || trans->priv->reconfigure;
1747 GST_OBJECT_FLAG_UNSET (trans->srcpad, GST_PAD_FLAG_NEED_RECONFIGURE);
1748 trans->priv->reconfigure = FALSE;
1749 GST_OBJECT_UNLOCK (trans->sinkpad);
1751 if (G_UNLIKELY (reconfigure)) {
1754 GST_DEBUG_OBJECT (trans, "we had a pending reconfigure");
1756 incaps = gst_pad_get_current_caps (trans->sinkpad);
1758 goto no_reconfigure;
1760 /* if we need to reconfigure we pretend a buffer with new caps arrived. This
1761 * will reconfigure the transform with the new output format. We can only
1762 * do this if the buffer actually has caps. */
1763 if (!gst_base_transform_setcaps (trans, trans->sinkpad, incaps)) {
1764 gst_caps_unref (incaps);
1765 goto not_negotiated;
1767 gst_caps_unref (incaps);
1771 if (GST_BUFFER_OFFSET_IS_VALID (inbuf))
1772 GST_DEBUG_OBJECT (trans,
1773 "handling buffer %p of size %" G_GSIZE_FORMAT " and offset %"
1774 G_GUINT64_FORMAT, inbuf, gst_buffer_get_size (inbuf),
1775 GST_BUFFER_OFFSET (inbuf));
1777 GST_DEBUG_OBJECT (trans,
1778 "handling buffer %p of size %" G_GSIZE_FORMAT " and offset NONE", inbuf,
1779 gst_buffer_get_size (inbuf));
1781 /* Don't allow buffer handling before negotiation, except in passthrough mode
1782 * or if the class doesn't implement a set_caps function (in which case it doesn't
1785 if (!trans->negotiated && !trans->passthrough && (bclass->set_caps != NULL))
1786 goto not_negotiated;
1788 /* Set discont flag so we can mark the outgoing buffer */
1789 if (GST_BUFFER_IS_DISCONT (inbuf)) {
1790 GST_DEBUG_OBJECT (trans, "got DISCONT buffer %p", inbuf);
1791 trans->priv->discont = TRUE;
1794 /* can only do QoS if the segment is in TIME */
1795 if (trans->segment.format != GST_FORMAT_TIME)
1798 /* QOS is done on the running time of the buffer, get it now */
1799 timestamp = GST_BUFFER_TIMESTAMP (inbuf);
1800 running_time = gst_segment_to_running_time (&trans->segment, GST_FORMAT_TIME,
1803 if (running_time != -1) {
1805 GstClockTime earliest_time;
1808 /* lock for getting the QoS parameters that are set (in a different thread)
1809 * with the QOS events */
1810 GST_OBJECT_LOCK (trans);
1811 earliest_time = trans->priv->earliest_time;
1812 proportion = trans->priv->proportion;
1813 /* check for QoS, don't perform conversion for buffers
1814 * that are known to be late. */
1815 need_skip = trans->priv->qos_enabled &&
1816 earliest_time != -1 && running_time <= earliest_time;
1817 GST_OBJECT_UNLOCK (trans);
1820 GstMessage *qos_msg;
1821 GstClockTime duration;
1822 guint64 stream_time;
1825 GST_CAT_DEBUG_OBJECT (GST_CAT_QOS, trans, "skipping transform: qostime %"
1826 GST_TIME_FORMAT " <= %" GST_TIME_FORMAT,
1827 GST_TIME_ARGS (running_time), GST_TIME_ARGS (earliest_time));
1829 trans->priv->dropped++;
1831 duration = GST_BUFFER_DURATION (inbuf);
1833 gst_segment_to_stream_time (&trans->segment, GST_FORMAT_TIME,
1835 jitter = GST_CLOCK_DIFF (running_time, earliest_time);
1838 gst_message_new_qos (GST_OBJECT_CAST (trans), FALSE, running_time,
1839 stream_time, timestamp, duration);
1840 gst_message_set_qos_values (qos_msg, jitter, proportion, 1000000);
1841 gst_message_set_qos_stats (qos_msg, GST_FORMAT_BUFFERS,
1842 trans->priv->processed, trans->priv->dropped);
1843 gst_element_post_message (GST_ELEMENT_CAST (trans), qos_msg);
1845 /* mark discont for next buffer */
1846 trans->priv->discont = TRUE;
1853 /* first try to allocate an output buffer based on the currently negotiated
1854 * format. outbuf will contain a buffer suitable for doing the configured
1855 * transform after this function. */
1856 if (bclass->prepare_output_buffer == NULL)
1859 GST_DEBUG_OBJECT (trans, "calling prepare buffer");
1860 ret = bclass->prepare_output_buffer (trans, inbuf, outbuf);
1862 if (ret != GST_FLOW_OK || *outbuf == NULL)
1865 GST_DEBUG_OBJECT (trans, "using allocated buffer in %p, out %p", inbuf,
1868 /* now perform the needed transform */
1869 if (trans->passthrough) {
1870 /* In passthrough mode, give transform_ip a look at the
1871 * buffer, without making it writable, or just push the
1873 if (bclass->transform_ip) {
1874 GST_DEBUG_OBJECT (trans, "doing passthrough transform");
1875 ret = bclass->transform_ip (trans, *outbuf);
1877 GST_DEBUG_OBJECT (trans, "element is in passthrough");
1880 want_in_place = (bclass->transform_ip != NULL) && trans->always_in_place;
1882 if (want_in_place) {
1883 GST_DEBUG_OBJECT (trans, "doing inplace transform");
1884 ret = bclass->transform_ip (trans, *outbuf);
1886 GST_DEBUG_OBJECT (trans, "doing non-inplace transform");
1888 if (bclass->transform)
1889 ret = bclass->transform (trans, inbuf, *outbuf);
1891 ret = GST_FLOW_NOT_SUPPORTED;
1896 /* only unref input buffer if we allocated a new outbuf buffer. If we reused
1897 * the input buffer, no refcount is changed to keep the input buffer writable
1899 if (*outbuf != inbuf)
1900 gst_buffer_unref (inbuf);
1907 gst_buffer_unref (inbuf);
1909 GST_ELEMENT_ERROR (trans, STREAM, NOT_IMPLEMENTED,
1910 ("not negotiated"), ("not negotiated"));
1911 return GST_FLOW_NOT_NEGOTIATED;
1915 gst_buffer_unref (inbuf);
1916 GST_ELEMENT_ERROR (trans, STREAM, NOT_IMPLEMENTED,
1917 ("Sub-class has no prepare_output_buffer implementation"), (NULL));
1918 return GST_FLOW_NOT_SUPPORTED;
1922 gst_buffer_unref (inbuf);
1924 GST_WARNING_OBJECT (trans, "could not get buffer from pool: %s",
1925 gst_flow_get_name (ret));
1930 /* FIXME, getrange is broken, need to pull range from the other
1931 * end based on the transform_size result.
1933 static GstFlowReturn
1934 gst_base_transform_getrange (GstPad * pad, GstObject * parent, guint64 offset,
1935 guint length, GstBuffer ** buffer)
1937 GstBaseTransform *trans;
1938 GstBaseTransformClass *klass;
1942 trans = GST_BASE_TRANSFORM (parent);
1944 ret = gst_pad_pull_range (trans->sinkpad, offset, length, &inbuf);
1945 if (G_UNLIKELY (ret != GST_FLOW_OK))
1948 klass = GST_BASE_TRANSFORM_GET_CLASS (trans);
1949 if (klass->before_transform)
1950 klass->before_transform (trans, inbuf);
1952 GST_BASE_TRANSFORM_LOCK (trans);
1953 ret = gst_base_transform_handle_buffer (trans, inbuf, buffer);
1954 GST_BASE_TRANSFORM_UNLOCK (trans);
1962 GST_DEBUG_OBJECT (trans, "failed to pull a buffer: %s",
1963 gst_flow_get_name (ret));
1968 static GstFlowReturn
1969 gst_base_transform_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer)
1971 GstBaseTransform *trans;
1972 GstBaseTransformClass *klass;
1974 GstClockTime position = GST_CLOCK_TIME_NONE;
1975 GstClockTime timestamp, duration;
1976 GstBuffer *outbuf = NULL;
1978 trans = GST_BASE_TRANSFORM (parent);
1980 timestamp = GST_BUFFER_TIMESTAMP (buffer);
1981 duration = GST_BUFFER_DURATION (buffer);
1983 /* calculate end position of the incoming buffer */
1984 if (timestamp != GST_CLOCK_TIME_NONE) {
1985 if (duration != GST_CLOCK_TIME_NONE)
1986 position = timestamp + duration;
1988 position = timestamp;
1991 klass = GST_BASE_TRANSFORM_GET_CLASS (trans);
1992 if (klass->before_transform)
1993 klass->before_transform (trans, buffer);
1995 /* protect transform method and concurrent buffer alloc */
1996 GST_BASE_TRANSFORM_LOCK (trans);
1997 ret = gst_base_transform_handle_buffer (trans, buffer, &outbuf);
1998 GST_BASE_TRANSFORM_UNLOCK (trans);
2000 /* outbuf can be NULL, this means a dropped buffer, if we have a buffer but
2001 * GST_BASE_TRANSFORM_FLOW_DROPPED we will not push either. */
2002 if (outbuf != NULL) {
2003 if (ret == GST_FLOW_OK) {
2004 GstClockTime position_out = GST_CLOCK_TIME_NONE;
2006 /* Remember last stop position */
2007 if (position != GST_CLOCK_TIME_NONE &&
2008 trans->segment.format == GST_FORMAT_TIME)
2009 trans->segment.position = position;
2011 if (GST_BUFFER_TIMESTAMP_IS_VALID (outbuf)) {
2012 position_out = GST_BUFFER_TIMESTAMP (outbuf);
2013 if (GST_BUFFER_DURATION_IS_VALID (outbuf))
2014 position_out += GST_BUFFER_DURATION (outbuf);
2015 } else if (position != GST_CLOCK_TIME_NONE) {
2016 position_out = position;
2018 if (position_out != GST_CLOCK_TIME_NONE
2019 && trans->segment.format == GST_FORMAT_TIME)
2020 trans->priv->position_out = position_out;
2022 /* apply DISCONT flag if the buffer is not yet marked as such */
2023 if (trans->priv->discont) {
2024 GST_DEBUG_OBJECT (trans, "we have a pending DISCONT");
2025 if (!GST_BUFFER_IS_DISCONT (outbuf)) {
2026 GST_DEBUG_OBJECT (trans, "marking DISCONT on output buffer");
2027 outbuf = gst_buffer_make_writable (outbuf);
2028 GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DISCONT);
2030 trans->priv->discont = FALSE;
2032 trans->priv->processed++;
2034 ret = gst_pad_push (trans->srcpad, outbuf);
2036 GST_DEBUG_OBJECT (trans, "we got return %s", gst_flow_get_name (ret));
2037 gst_buffer_unref (outbuf);
2041 /* convert internal flow to OK and mark discont for the next buffer. */
2042 if (ret == GST_BASE_TRANSFORM_FLOW_DROPPED) {
2043 GST_DEBUG_OBJECT (trans, "dropped a buffer, marking DISCONT");
2044 trans->priv->discont = TRUE;
2052 gst_base_transform_set_property (GObject * object, guint prop_id,
2053 const GValue * value, GParamSpec * pspec)
2055 GstBaseTransform *trans;
2057 trans = GST_BASE_TRANSFORM (object);
2061 gst_base_transform_set_qos_enabled (trans, g_value_get_boolean (value));
2064 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
2070 gst_base_transform_get_property (GObject * object, guint prop_id,
2071 GValue * value, GParamSpec * pspec)
2073 GstBaseTransform *trans;
2075 trans = GST_BASE_TRANSFORM (object);
2079 g_value_set_boolean (value, gst_base_transform_is_qos_enabled (trans));
2082 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
2087 /* not a vmethod of anything, just an internal method */
2089 gst_base_transform_activate (GstBaseTransform * trans, gboolean active)
2091 GstBaseTransformClass *bclass;
2092 gboolean result = TRUE;
2094 bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
2097 GstCaps *incaps, *outcaps;
2099 if (trans->priv->pad_mode == GST_PAD_MODE_NONE && bclass->start)
2100 result &= bclass->start (trans);
2102 incaps = gst_pad_get_current_caps (trans->sinkpad);
2103 outcaps = gst_pad_get_current_caps (trans->srcpad);
2105 GST_OBJECT_LOCK (trans);
2106 if (incaps && outcaps)
2107 trans->have_same_caps =
2108 gst_caps_is_equal (incaps, outcaps) || trans->passthrough;
2110 trans->have_same_caps = trans->passthrough;
2111 GST_DEBUG_OBJECT (trans, "have_same_caps %d", trans->have_same_caps);
2112 trans->negotiated = FALSE;
2113 trans->have_segment = FALSE;
2114 gst_segment_init (&trans->segment, GST_FORMAT_UNDEFINED);
2115 trans->priv->position_out = GST_CLOCK_TIME_NONE;
2116 trans->priv->proportion = 1.0;
2117 trans->priv->earliest_time = -1;
2118 trans->priv->discont = FALSE;
2119 trans->priv->processed = 0;
2120 trans->priv->dropped = 0;
2121 GST_OBJECT_UNLOCK (trans);
2124 gst_caps_unref (incaps);
2126 gst_caps_unref (outcaps);
2128 /* We must make sure streaming has finished before resetting things
2129 * and calling the ::stop vfunc */
2130 GST_PAD_STREAM_LOCK (trans->sinkpad);
2131 GST_PAD_STREAM_UNLOCK (trans->sinkpad);
2133 trans->have_same_caps = FALSE;
2134 /* We can only reset the passthrough mode if the instance told us to
2135 handle it in configure_caps */
2136 if (bclass->passthrough_on_same_caps) {
2137 gst_base_transform_set_passthrough (trans, FALSE);
2139 gst_caps_replace (&trans->cache_caps1, NULL);
2140 gst_caps_replace (&trans->cache_caps2, NULL);
2142 if (trans->priv->pad_mode != GST_PAD_MODE_NONE && bclass->stop)
2143 result &= bclass->stop (trans);
2145 gst_base_transform_set_allocation (trans, NULL, NULL, 0, 0);
2152 gst_base_transform_sink_activate_mode (GstPad * pad, GstObject * parent,
2153 GstPadMode mode, gboolean active)
2155 gboolean result = FALSE;
2156 GstBaseTransform *trans;
2158 trans = GST_BASE_TRANSFORM (parent);
2161 case GST_PAD_MODE_PUSH:
2163 result = gst_base_transform_activate (trans, active);
2166 trans->priv->pad_mode = active ? GST_PAD_MODE_PUSH : GST_PAD_MODE_NONE;
2178 gst_base_transform_src_activate_mode (GstPad * pad, GstObject * parent,
2179 GstPadMode mode, gboolean active)
2181 gboolean result = FALSE;
2182 GstBaseTransform *trans;
2184 trans = GST_BASE_TRANSFORM (parent);
2187 case GST_PAD_MODE_PULL:
2190 gst_pad_activate_mode (trans->sinkpad, GST_PAD_MODE_PULL, active);
2193 result &= gst_base_transform_activate (trans, active);
2196 trans->priv->pad_mode = active ? mode : GST_PAD_MODE_NONE;
2208 * gst_base_transform_set_passthrough:
2209 * @trans: the #GstBaseTransform to set
2210 * @passthrough: boolean indicating passthrough mode.
2212 * Set passthrough mode for this filter by default. This is mostly
2213 * useful for filters that do not care about negotiation.
2215 * Always TRUE for filters which don't implement either a transform
2216 * or transform_ip method.
2221 gst_base_transform_set_passthrough (GstBaseTransform * trans,
2222 gboolean passthrough)
2224 GstBaseTransformClass *bclass;
2226 g_return_if_fail (GST_IS_BASE_TRANSFORM (trans));
2228 bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
2230 GST_OBJECT_LOCK (trans);
2231 if (passthrough == FALSE) {
2232 if (bclass->transform_ip || bclass->transform)
2233 trans->passthrough = FALSE;
2235 trans->passthrough = TRUE;
2238 GST_DEBUG_OBJECT (trans, "set passthrough %d", trans->passthrough);
2239 GST_OBJECT_UNLOCK (trans);
2243 * gst_base_transform_is_passthrough:
2244 * @trans: the #GstBaseTransform to query
2246 * See if @trans is configured as a passthrough transform.
2248 * Returns: TRUE is the transform is configured in passthrough mode.
2253 gst_base_transform_is_passthrough (GstBaseTransform * trans)
2257 g_return_val_if_fail (GST_IS_BASE_TRANSFORM (trans), FALSE);
2259 GST_OBJECT_LOCK (trans);
2260 result = trans->passthrough;
2261 GST_OBJECT_UNLOCK (trans);
2267 * gst_base_transform_set_in_place:
2268 * @trans: the #GstBaseTransform to modify
2269 * @in_place: Boolean value indicating that we would like to operate
2270 * on in_place buffers.
2272 * Determines whether a non-writable buffer will be copied before passing
2273 * to the transform_ip function.
2275 * <listitem>Always TRUE if no transform function is implemented.</listitem>
2276 * <listitem>Always FALSE if ONLY transform function is implemented.</listitem>
2282 gst_base_transform_set_in_place (GstBaseTransform * trans, gboolean in_place)
2284 GstBaseTransformClass *bclass;
2286 g_return_if_fail (GST_IS_BASE_TRANSFORM (trans));
2288 bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
2290 GST_OBJECT_LOCK (trans);
2293 if (bclass->transform_ip) {
2294 GST_DEBUG_OBJECT (trans, "setting in_place TRUE");
2295 trans->always_in_place = TRUE;
2298 if (bclass->transform) {
2299 GST_DEBUG_OBJECT (trans, "setting in_place FALSE");
2300 trans->always_in_place = FALSE;
2304 GST_OBJECT_UNLOCK (trans);
2308 * gst_base_transform_is_in_place:
2309 * @trans: the #GstBaseTransform to query
2311 * See if @trans is configured as a in_place transform.
2313 * Returns: TRUE is the transform is configured in in_place mode.
2318 gst_base_transform_is_in_place (GstBaseTransform * trans)
2322 g_return_val_if_fail (GST_IS_BASE_TRANSFORM (trans), FALSE);
2324 GST_OBJECT_LOCK (trans);
2325 result = trans->always_in_place;
2326 GST_OBJECT_UNLOCK (trans);
2332 * gst_base_transform_update_qos:
2333 * @trans: a #GstBaseTransform
2334 * @proportion: the proportion
2335 * @diff: the diff against the clock
2336 * @timestamp: the timestamp of the buffer generating the QoS expressed in
2339 * Set the QoS parameters in the transform. This function is called internally
2340 * when a QOS event is received but subclasses can provide custom information
2348 gst_base_transform_update_qos (GstBaseTransform * trans,
2349 gdouble proportion, GstClockTimeDiff diff, GstClockTime timestamp)
2352 g_return_if_fail (GST_IS_BASE_TRANSFORM (trans));
2354 GST_CAT_DEBUG_OBJECT (GST_CAT_QOS, trans,
2355 "qos: proportion: %lf, diff %" G_GINT64_FORMAT ", timestamp %"
2356 GST_TIME_FORMAT, proportion, diff, GST_TIME_ARGS (timestamp));
2358 GST_OBJECT_LOCK (trans);
2359 trans->priv->proportion = proportion;
2360 trans->priv->earliest_time = timestamp + diff;
2361 GST_OBJECT_UNLOCK (trans);
2365 * gst_base_transform_set_qos_enabled:
2366 * @trans: a #GstBaseTransform
2367 * @enabled: new state
2369 * Enable or disable QoS handling in the transform.
2376 gst_base_transform_set_qos_enabled (GstBaseTransform * trans, gboolean enabled)
2378 g_return_if_fail (GST_IS_BASE_TRANSFORM (trans));
2380 GST_CAT_DEBUG_OBJECT (GST_CAT_QOS, trans, "enabled: %d", enabled);
2382 GST_OBJECT_LOCK (trans);
2383 trans->priv->qos_enabled = enabled;
2384 GST_OBJECT_UNLOCK (trans);
2388 * gst_base_transform_is_qos_enabled:
2389 * @trans: a #GstBaseTransform
2391 * Queries if the transform will handle QoS.
2393 * Returns: TRUE if QoS is enabled.
2400 gst_base_transform_is_qos_enabled (GstBaseTransform * trans)
2404 g_return_val_if_fail (GST_IS_BASE_TRANSFORM (trans), FALSE);
2406 GST_OBJECT_LOCK (trans);
2407 result = trans->priv->qos_enabled;
2408 GST_OBJECT_UNLOCK (trans);
2414 * gst_base_transform_set_gap_aware:
2415 * @trans: a #GstBaseTransform
2416 * @gap_aware: New state
2418 * If @gap_aware is %FALSE (the default), output buffers will have the
2419 * %GST_BUFFER_FLAG_GAP flag unset.
2421 * If set to %TRUE, the element must handle output buffers with this flag set
2422 * correctly, i.e. it can assume that the buffer contains neutral data but must
2423 * unset the flag if the output is no neutral data.
2430 gst_base_transform_set_gap_aware (GstBaseTransform * trans, gboolean gap_aware)
2432 g_return_if_fail (GST_IS_BASE_TRANSFORM (trans));
2434 GST_OBJECT_LOCK (trans);
2435 trans->priv->gap_aware = gap_aware;
2436 GST_DEBUG_OBJECT (trans, "set gap aware %d", trans->priv->gap_aware);
2437 GST_OBJECT_UNLOCK (trans);
2441 * gst_base_transform_suggest:
2442 * @trans: a #GstBaseTransform
2443 * @caps: (transfer none): caps to suggest
2444 * @size: buffer size to suggest
2446 * Instructs @trans to suggest new @caps upstream. A copy of @caps will be
2452 gst_base_transform_suggest (GstBaseTransform * trans, GstCaps * caps,
2455 g_return_if_fail (GST_IS_BASE_TRANSFORM (trans));
2457 /* push the renegotiate event */
2458 if (!gst_pad_push_event (GST_BASE_TRANSFORM_SINK_PAD (trans),
2459 gst_event_new_reconfigure ()))
2460 GST_DEBUG_OBJECT (trans, "Renegotiate event wasn't handled");
2464 * gst_base_transform_reconfigure:
2465 * @trans: a #GstBaseTransform
2467 * Instructs @trans to renegotiate a new downstream transform on the next
2468 * buffer. This function is typically called after properties on the transform
2469 * were set that influence the output format.
2474 gst_base_transform_reconfigure (GstBaseTransform * trans)
2476 g_return_if_fail (GST_IS_BASE_TRANSFORM (trans));
2478 GST_OBJECT_LOCK (trans);
2479 GST_DEBUG_OBJECT (trans, "marking reconfigure");
2480 trans->priv->reconfigure = TRUE;
2481 GST_OBJECT_UNLOCK (trans);