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, GstCaps * filter);
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);
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, GstCaps * filter)
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, filter);
476 GST_DEBUG_OBJECT (trans, " to: %" GST_PTR_FORMAT, temp);
477 temp = gst_caps_make_writable (temp);
478 gst_caps_append (ret, temp);
480 gint n = gst_caps_get_size (caps);
481 /* we send caps with just one structure to the transform
482 * function as this is easier for the element */
483 for (i = 0; i < n; i++) {
486 nth = gst_caps_copy_nth (caps, i);
487 GST_LOG_OBJECT (trans, "from[%d]: %" GST_PTR_FORMAT, i, nth);
488 temp = klass->transform_caps (trans, direction, nth, filter);
489 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 #ifndef G_DISABLE_ASSERT
511 if (!gst_caps_is_subset (ret, filter)) {
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));
519 temp = gst_caps_intersect_full (filter, ret, GST_CAPS_INTERSECT_FIRST);
520 gst_caps_unref (ret);
526 GST_DEBUG_OBJECT (trans, "identity from: %" GST_PTR_FORMAT, caps);
527 /* no transform function, use the identity transform */
529 ret = gst_caps_intersect_full (filter, caps, GST_CAPS_INTERSECT_FIRST);
531 ret = gst_caps_ref (caps);
535 GST_DEBUG_OBJECT (trans, "to: (%d) %" GST_PTR_FORMAT, gst_caps_get_size (ret),
541 /* transform a buffer of @size with @caps on the pad with @direction to
542 * the size of a buffer with @othercaps and store the result in @othersize
544 * We have two ways of doing this:
545 * 1) use a custom transform size function, this is for complicated custom
546 * cases with no fixed unit_size.
547 * 2) use the unit_size functions where there is a relationship between the
548 * caps and the size of a buffer.
551 gst_base_transform_transform_size (GstBaseTransform * trans,
552 GstPadDirection direction, GstCaps * caps,
553 gsize size, GstCaps * othercaps, gsize * othersize)
555 gsize inunitsize, outunitsize, units;
556 GstBaseTransformClass *klass;
559 klass = GST_BASE_TRANSFORM_GET_CLASS (trans);
561 GST_DEBUG_OBJECT (trans, "asked to transform size %d for caps %"
562 GST_PTR_FORMAT " to size for caps %" GST_PTR_FORMAT " in direction %s",
563 size, caps, othercaps, direction == GST_PAD_SRC ? "SRC" : "SINK");
565 if (klass->transform_size) {
566 /* if there is a custom transform function, use this */
567 ret = klass->transform_size (trans, direction, caps, size, othercaps,
569 } else if (klass->get_unit_size == NULL) {
570 /* if there is no transform_size and no unit_size, it means the
571 * element does not modify the size of a buffer */
575 /* there is no transform_size function, we have to use the unit_size
576 * functions. This method assumes there is a fixed unit_size associated with
577 * each caps. We provide the same amount of units on both sides. */
578 if (!gst_base_transform_get_unit_size (trans, caps, &inunitsize))
581 GST_DEBUG_OBJECT (trans, "input size %d, input unit size %d", size,
584 /* input size must be a multiple of the unit_size of the input caps */
585 if (inunitsize == 0 || (size % inunitsize != 0))
588 /* get the amount of units */
589 units = size / inunitsize;
591 /* now get the unit size of the output */
592 if (!gst_base_transform_get_unit_size (trans, othercaps, &outunitsize))
595 /* the output size is the unit_size times the amount of units on the
597 *othersize = units * outunitsize;
598 GST_DEBUG_OBJECT (trans, "transformed size to %d", *othersize);
607 GST_DEBUG_OBJECT (trans, "could not get in_size");
608 g_warning ("%s: could not get in_size", GST_ELEMENT_NAME (trans));
613 GST_DEBUG_OBJECT (trans, "Size %u is not a multiple of unit size %u", size,
615 g_warning ("%s: size %" G_GSIZE_FORMAT " is not a multiple of unit size %"
616 G_GSIZE_FORMAT, GST_ELEMENT_NAME (trans), size, inunitsize);
621 GST_DEBUG_OBJECT (trans, "could not get out_size");
622 g_warning ("%s: could not get out_size", GST_ELEMENT_NAME (trans));
627 /* get the caps that can be handled by @pad. We perform:
629 * - take the caps of peer of otherpad,
630 * - filter against the padtemplate of otherpad,
631 * - calculate all transforms of remaining caps
632 * - filter against template of @pad
634 * If there is no peer, we simply return the caps of the padtemplate of pad.
637 gst_base_transform_getcaps (GstPad * pad, GstCaps * filter)
639 GstBaseTransform *trans;
641 GstCaps *peercaps, *caps, *peerfilter = NULL;
643 trans = GST_BASE_TRANSFORM (gst_pad_get_parent (pad));
645 otherpad = (pad == trans->srcpad) ? trans->sinkpad : trans->srcpad;
647 /* we can do what the peer can */
649 GstCaps *temp, *templ;
651 GST_DEBUG_OBJECT (pad, "filter caps %" GST_PTR_FORMAT, filter);
653 /* filtered against our padtemplate on the other side */
654 templ = gst_pad_get_pad_template_caps (pad);
655 GST_DEBUG_OBJECT (pad, "our template %" GST_PTR_FORMAT, templ);
656 temp = gst_caps_intersect_full (filter, templ, GST_CAPS_INTERSECT_FIRST);
657 GST_DEBUG_OBJECT (pad, "intersected %" GST_PTR_FORMAT, temp);
658 gst_caps_unref (templ);
660 /* then see what we can transform this to */
661 peerfilter = gst_base_transform_transform_caps (trans,
662 GST_PAD_DIRECTION (pad), temp, NULL);
663 GST_DEBUG_OBJECT (pad, "transformed %" GST_PTR_FORMAT, peerfilter);
664 gst_caps_unref (temp);
666 /* and filter against the template of this pad */
667 templ = gst_pad_get_pad_template_caps (otherpad);
668 GST_DEBUG_OBJECT (pad, "our template %" GST_PTR_FORMAT, templ);
669 /* We keep the caps sorted like the returned caps */
671 gst_caps_intersect_full (peerfilter, templ, GST_CAPS_INTERSECT_FIRST);
672 GST_DEBUG_OBJECT (pad, "intersected %" GST_PTR_FORMAT, temp);
673 gst_caps_unref (peerfilter);
674 gst_caps_unref (templ);
678 peercaps = gst_pad_peer_get_caps (otherpad, peerfilter);
681 gst_caps_unref (peerfilter);
683 if (peercaps && !gst_caps_is_any (peercaps)) {
684 GstCaps *temp, *templ;
686 GST_DEBUG_OBJECT (pad, "peer caps %" GST_PTR_FORMAT, peercaps);
688 /* filtered against our padtemplate on the other side */
689 templ = gst_pad_get_pad_template_caps (otherpad);
690 GST_DEBUG_OBJECT (pad, "our template %" GST_PTR_FORMAT, templ);
691 temp = gst_caps_intersect_full (peercaps, templ, GST_CAPS_INTERSECT_FIRST);
692 GST_DEBUG_OBJECT (pad, "intersected %" GST_PTR_FORMAT, temp);
693 gst_caps_unref (templ);
695 /* then see what we can transform this to */
696 caps = gst_base_transform_transform_caps (trans,
697 GST_PAD_DIRECTION (otherpad), temp, filter);
698 GST_DEBUG_OBJECT (pad, "transformed %" GST_PTR_FORMAT, caps);
699 gst_caps_unref (temp);
703 /* and filter against the template of this pad */
704 templ = gst_pad_get_pad_template_caps (pad);
705 GST_DEBUG_OBJECT (pad, "our template %" GST_PTR_FORMAT, templ);
706 /* We keep the caps sorted like the returned caps */
707 temp = gst_caps_intersect_full (caps, templ, GST_CAPS_INTERSECT_FIRST);
708 GST_DEBUG_OBJECT (pad, "intersected %" GST_PTR_FORMAT, temp);
709 gst_caps_unref (caps);
710 gst_caps_unref (templ);
713 /* Now try if we can put the untransformed downstream caps first */
714 temp = gst_caps_intersect_full (peercaps, caps, GST_CAPS_INTERSECT_FIRST);
715 if (!gst_caps_is_empty (temp)) {
716 gst_caps_merge (temp, caps);
719 gst_caps_unref (temp);
722 /* no peer or the peer can do anything, our padtemplate is enough then */
723 caps = gst_pad_get_pad_template_caps (pad);
728 temp = gst_caps_intersect_full (filter, caps, GST_CAPS_INTERSECT_FIRST);
729 gst_caps_unref (caps);
735 GST_DEBUG_OBJECT (trans, "returning %" GST_PTR_FORMAT, caps);
738 gst_caps_unref (peercaps);
740 gst_object_unref (trans);
745 /* function triggered when the in and out caps are negotiated and need
746 * to be configured in the subclass. */
748 gst_base_transform_configure_caps (GstBaseTransform * trans, GstCaps * in,
752 GstBaseTransformClass *klass;
754 klass = GST_BASE_TRANSFORM_GET_CLASS (trans);
756 GST_DEBUG_OBJECT (trans, "in caps: %" GST_PTR_FORMAT, in);
757 GST_DEBUG_OBJECT (trans, "out caps: %" GST_PTR_FORMAT, out);
759 /* clear the cache */
760 gst_caps_replace (&trans->cache_caps1, NULL);
761 gst_caps_replace (&trans->cache_caps2, NULL);
763 /* figure out same caps state */
764 trans->have_same_caps = gst_caps_is_equal (in, out);
765 GST_DEBUG_OBJECT (trans, "have_same_caps: %d", trans->have_same_caps);
767 /* If we've a transform_ip method and same input/output caps, set in_place
768 * by default. If for some reason the sub-class prefers using a transform
769 * function, it can clear the in place flag in the set_caps */
770 gst_base_transform_set_in_place (trans,
771 klass->transform_ip && trans->have_same_caps);
773 /* Set the passthrough if the class wants passthrough_on_same_caps
774 * and we have the same caps on each pad */
775 if (klass->passthrough_on_same_caps)
776 gst_base_transform_set_passthrough (trans, trans->have_same_caps);
778 /* now configure the element with the caps */
779 if (klass->set_caps) {
780 GST_DEBUG_OBJECT (trans, "Calling set_caps method to setup caps");
781 ret = klass->set_caps (trans, in, out);
784 trans->negotiated = ret;
789 /* given a fixed @caps on @pad, create the best possible caps for the
791 * @caps must be fixed when calling this function.
793 * This function calls the transform caps vmethod of the basetransform to figure
794 * out the possible target formats. It then tries to select the best format from
797 * - attempt passthrough if the target caps is a superset of the input caps
798 * - fixating by using peer caps
799 * - fixating with transform fixate function
800 * - fixating with pad fixate functions.
802 * this function returns a caps that can be transformed into and is accepted by
806 gst_base_transform_find_transform (GstBaseTransform * trans, GstPad * pad,
809 GstBaseTransformClass *klass;
810 GstPad *otherpad, *otherpeer;
812 gboolean peer_checked = FALSE;
815 /* caps must be fixed here, this is a programming error if it's not */
816 g_return_val_if_fail (gst_caps_is_fixed (caps), NULL);
818 klass = GST_BASE_TRANSFORM_GET_CLASS (trans);
820 otherpad = (pad == trans->srcpad) ? trans->sinkpad : trans->srcpad;
821 otherpeer = gst_pad_get_peer (otherpad);
823 /* see how we can transform the input caps. We need to do this even for
824 * passthrough because it might be possible that this element cannot support
825 * passthrough at all. */
826 othercaps = gst_base_transform_transform_caps (trans,
827 GST_PAD_DIRECTION (pad), caps, NULL);
829 /* The caps we can actually output is the intersection of the transformed
830 * caps with the pad template for the pad */
832 GstCaps *intersect, *templ_caps;
834 templ_caps = gst_pad_get_pad_template_caps (otherpad);
835 GST_DEBUG_OBJECT (trans,
836 "intersecting against padtemplate %" GST_PTR_FORMAT, templ_caps);
839 gst_caps_intersect_full (othercaps, templ_caps,
840 GST_CAPS_INTERSECT_FIRST);
842 gst_caps_unref (othercaps);
843 gst_caps_unref (templ_caps);
844 othercaps = intersect;
847 /* check if transform is empty */
848 if (!othercaps || gst_caps_is_empty (othercaps))
851 /* if the othercaps are not fixed, we need to fixate them, first attempt
852 * is by attempting passthrough if the othercaps are a superset of caps. */
853 /* FIXME. maybe the caps is not fixed because it has multiple structures of
855 is_fixed = gst_caps_is_fixed (othercaps);
857 GST_DEBUG_OBJECT (trans,
858 "transform returned non fixed %" GST_PTR_FORMAT, othercaps);
860 /* Now let's see what the peer suggests based on our transformed caps */
862 GstCaps *peercaps, *intersection, *templ_caps;
864 GST_DEBUG_OBJECT (trans,
865 "Checking peer caps with filter %" GST_PTR_FORMAT, othercaps);
867 peercaps = gst_pad_get_caps (otherpeer, othercaps);
868 GST_DEBUG_OBJECT (trans, "Resulted in %" GST_PTR_FORMAT, peercaps);
870 templ_caps = gst_pad_get_pad_template_caps (otherpad);
872 GST_DEBUG_OBJECT (trans,
873 "Intersecting with template caps %" GST_PTR_FORMAT, templ_caps);
876 gst_caps_intersect_full (peercaps, templ_caps,
877 GST_CAPS_INTERSECT_FIRST);
878 GST_DEBUG_OBJECT (trans, "Intersection: %" GST_PTR_FORMAT, intersection);
879 gst_caps_unref (peercaps);
880 gst_caps_unref (templ_caps);
881 peercaps = intersection;
883 GST_DEBUG_OBJECT (trans,
884 "Intersecting with transformed caps %" GST_PTR_FORMAT, othercaps);
886 gst_caps_intersect_full (peercaps, othercaps,
887 GST_CAPS_INTERSECT_FIRST);
888 GST_DEBUG_OBJECT (trans, "Intersection: %" GST_PTR_FORMAT, intersection);
889 gst_caps_unref (peercaps);
890 gst_caps_unref (othercaps);
891 othercaps = intersection;
892 is_fixed = gst_caps_is_fixed (othercaps);
895 GST_DEBUG_OBJECT (trans, "no peer, doing passthrough");
896 gst_caps_unref (othercaps);
897 othercaps = gst_caps_ref (caps);
901 if (gst_caps_is_empty (othercaps))
902 goto no_transform_possible;
904 /* second attempt at fixation, call the fixate vmethod and
905 * ultimately call the pad fixate function. */
907 GST_DEBUG_OBJECT (trans,
908 "trying to fixate %" GST_PTR_FORMAT " on pad %s:%s",
909 othercaps, GST_DEBUG_PAD_NAME (otherpad));
911 /* since we have no other way to fixate left, we might as well just take
912 * the first of the caps list and fixate that */
914 /* FIXME: when fixating using the vmethod, it might make sense to fixate
915 * each of the caps; but Wim doesn't see a use case for that yet */
916 gst_caps_truncate (othercaps);
917 peer_checked = FALSE;
919 if (klass->fixate_caps) {
920 GST_DEBUG_OBJECT (trans, "trying to fixate %" GST_PTR_FORMAT
921 " using caps %" GST_PTR_FORMAT
922 " on pad %s:%s using fixate_caps vmethod", othercaps, caps,
923 GST_DEBUG_PAD_NAME (otherpad));
924 klass->fixate_caps (trans, GST_PAD_DIRECTION (pad), caps, othercaps);
925 is_fixed = gst_caps_is_fixed (othercaps);
927 /* if still not fixed, no other option but to let the default pad fixate
928 * function do its job */
930 GST_DEBUG_OBJECT (trans, "trying to fixate %" GST_PTR_FORMAT
931 " on pad %s:%s using gst_pad_fixate_caps", othercaps,
932 GST_DEBUG_PAD_NAME (otherpad));
933 gst_pad_fixate_caps (otherpad, othercaps);
934 is_fixed = gst_caps_is_fixed (othercaps);
936 GST_DEBUG_OBJECT (trans, "after fixating %" GST_PTR_FORMAT, othercaps);
938 GST_DEBUG ("caps are fixed");
939 /* else caps are fixed but the subclass may want to add fields */
940 if (klass->fixate_caps) {
941 othercaps = gst_caps_make_writable (othercaps);
943 GST_DEBUG_OBJECT (trans, "doing fixate %" GST_PTR_FORMAT
944 " using caps %" GST_PTR_FORMAT
945 " on pad %s:%s using fixate_caps vmethod", othercaps, caps,
946 GST_DEBUG_PAD_NAME (otherpad));
948 klass->fixate_caps (trans, GST_PAD_DIRECTION (pad), caps, othercaps);
949 is_fixed = gst_caps_is_fixed (othercaps);
953 /* caps should be fixed now, if not we have to fail. */
955 goto could_not_fixate;
957 /* and peer should accept, don't check again if we already checked the
958 * othercaps against the peer. */
959 if (!peer_checked && otherpeer && !gst_pad_accept_caps (otherpeer, othercaps))
962 GST_DEBUG_OBJECT (trans, "Input caps were %" GST_PTR_FORMAT
963 ", and got final caps %" GST_PTR_FORMAT, caps, othercaps);
966 gst_object_unref (otherpeer);
973 GST_DEBUG_OBJECT (trans,
974 "transform returned useless %" GST_PTR_FORMAT, othercaps);
977 no_transform_possible:
979 GST_DEBUG_OBJECT (trans,
980 "transform could not transform %" GST_PTR_FORMAT
981 " in anything we support", caps);
986 GST_DEBUG_OBJECT (trans, "FAILED to fixate %" GST_PTR_FORMAT, othercaps);
991 GST_DEBUG_OBJECT (trans, "FAILED to get peer of %" GST_PTR_FORMAT
992 " to accept %" GST_PTR_FORMAT, otherpad, othercaps);
998 gst_object_unref (otherpeer);
1000 gst_caps_unref (othercaps);
1006 gst_base_transform_acceptcaps_default (GstBaseTransform * trans,
1007 GstPadDirection direction, GstCaps * caps)
1011 GstCaps *othercaps = NULL;
1013 gboolean ret = TRUE;
1016 otherpad = (pad == trans->srcpad) ? trans->sinkpad : trans->srcpad;
1018 /* we need fixed caps for the check, fall back to the default implementation
1020 if (!gst_caps_is_fixed (caps))
1025 GST_DEBUG_OBJECT (trans, "non fixed accept caps %" GST_PTR_FORMAT, caps);
1027 /* get all the formats we can handle on this pad */
1028 if (direction == GST_PAD_SRC)
1029 allowed = gst_pad_get_caps (trans->srcpad, NULL);
1031 allowed = gst_pad_get_caps (trans->sinkpad, NULL);
1034 GST_DEBUG_OBJECT (trans, "gst_pad_get_caps() failed");
1035 goto no_transform_possible;
1038 GST_DEBUG_OBJECT (trans, "allowed caps %" GST_PTR_FORMAT, allowed);
1040 /* intersect with the requested format */
1041 ret = gst_caps_can_intersect (allowed, caps);
1042 gst_caps_unref (allowed);
1045 goto no_transform_possible;
1049 GST_DEBUG_OBJECT (pad, "accept caps %" GST_PTR_FORMAT, caps);
1051 /* find best possible caps for the other pad as a way to see if we can
1052 * transform this caps. */
1053 othercaps = gst_base_transform_find_transform (trans, pad, caps, FALSE);
1054 if (!othercaps || gst_caps_is_empty (othercaps))
1055 goto no_transform_possible;
1057 GST_DEBUG_OBJECT (pad, "we can transform to %" GST_PTR_FORMAT, othercaps);
1063 /* We know it's always NULL since we never use it */
1065 gst_caps_unref (othercaps);
1071 no_transform_possible:
1073 GST_DEBUG_OBJECT (trans,
1074 "transform could not transform %" GST_PTR_FORMAT
1075 " in anything we support", caps);
1082 gst_base_transform_acceptcaps (GstPad * pad, GstCaps * caps)
1084 gboolean ret = TRUE;
1085 GstBaseTransform *trans;
1086 GstBaseTransformClass *bclass;
1088 trans = GST_BASE_TRANSFORM (gst_pad_get_parent (pad));
1089 bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
1091 if (bclass->accept_caps)
1092 ret = bclass->accept_caps (trans, GST_PAD_DIRECTION (pad), caps);
1094 gst_object_unref (trans);
1099 /* called when new caps arrive on the sink or source pad,
1100 * We try to find the best caps for the other side using our _find_transform()
1101 * function. If there are caps, we configure the transform for this new
1104 * FIXME, this function is currently commutative but this should not really be
1105 * because we never set caps starting from the srcpad.
1108 gst_base_transform_setcaps (GstBaseTransform * trans, GstPad * pad,
1111 GstPad *otherpad, *otherpeer;
1112 GstCaps *othercaps = NULL;
1113 gboolean ret = TRUE;
1114 GstCaps *incaps, *outcaps;
1116 otherpad = (pad == trans->srcpad) ? trans->sinkpad : trans->srcpad;
1117 otherpeer = gst_pad_get_peer (otherpad);
1119 /* if we get called recursively, we bail out now to avoid an
1121 if (GST_PAD_IS_IN_SETCAPS (otherpad))
1124 GST_DEBUG_OBJECT (pad, "have new caps %p %" GST_PTR_FORMAT, caps, caps);
1126 /* find best possible caps for the other pad */
1127 othercaps = gst_base_transform_find_transform (trans, pad, caps);
1128 if (!othercaps || gst_caps_is_empty (othercaps))
1129 goto no_transform_possible;
1131 /* configure the element now */
1132 /* make sure in and out caps are correct */
1133 if (pad == trans->sinkpad) {
1135 outcaps = othercaps;
1141 /* if we have the same caps, we can optimize and reuse the input caps */
1142 if (gst_caps_is_equal (incaps, outcaps)) {
1143 GST_INFO_OBJECT (trans, "reuse caps");
1144 gst_caps_unref (othercaps);
1145 outcaps = othercaps = gst_caps_ref (incaps);
1148 /* call configure now */
1149 if (!(ret = gst_base_transform_configure_caps (trans, incaps, outcaps)))
1150 goto failed_configure;
1152 /* we know this will work, we implement the setcaps */
1153 gst_pad_set_caps (otherpad, othercaps);
1155 if (pad == trans->srcpad && trans->priv->pad_mode == GST_ACTIVATE_PULL) {
1157 ret &= gst_pad_set_caps (otherpeer, othercaps);
1159 GST_INFO_OBJECT (trans, "otherpeer setcaps(%" GST_PTR_FORMAT ") failed",
1166 gst_object_unref (otherpeer);
1168 gst_caps_unref (othercaps);
1170 trans->negotiated = ret;
1175 no_transform_possible:
1177 GST_WARNING_OBJECT (trans,
1178 "transform could not transform %" GST_PTR_FORMAT
1179 " in anything we support", caps);
1185 GST_WARNING_OBJECT (trans, "FAILED to configure caps %" GST_PTR_FORMAT
1186 " to accept %" GST_PTR_FORMAT, otherpad, othercaps);
1193 gst_base_transform_query (GstPad * pad, GstQuery * query)
1195 gboolean ret = FALSE;
1196 GstBaseTransform *trans;
1199 trans = GST_BASE_TRANSFORM (gst_pad_get_parent (pad));
1200 if (G_UNLIKELY (trans == NULL))
1202 otherpad = (pad == trans->srcpad) ? trans->sinkpad : trans->srcpad;
1204 switch (GST_QUERY_TYPE (query)) {
1205 case GST_QUERY_POSITION:{
1208 gst_query_parse_position (query, &format, NULL);
1209 if (format == GST_FORMAT_TIME && trans->segment.format == GST_FORMAT_TIME) {
1213 if ((pad == trans->sinkpad)
1214 || (trans->priv->position_out == GST_CLOCK_TIME_NONE)) {
1216 gst_segment_to_stream_time (&trans->segment, GST_FORMAT_TIME,
1217 trans->segment.position);
1219 pos = gst_segment_to_stream_time (&trans->segment, GST_FORMAT_TIME,
1220 trans->priv->position_out);
1222 gst_query_set_position (query, format, pos);
1224 ret = gst_pad_peer_query (otherpad, query);
1229 ret = gst_pad_peer_query (otherpad, query);
1233 gst_object_unref (trans);
1237 static const GstQueryType *
1238 gst_base_transform_query_type (GstPad * pad)
1240 static const GstQueryType types[] = {
1248 /* Allocate a buffer using gst_pad_alloc_buffer
1250 * This function can do renegotiation on the source pad
1252 * The output buffer is always writable. outbuf can be equal to
1253 * inbuf, the caller should be prepared for this and perform
1254 * appropriate refcounting.
1256 static GstFlowReturn
1257 gst_base_transform_prepare_output_buffer (GstBaseTransform * trans,
1258 GstBuffer * in_buf, GstBuffer ** out_buf)
1260 GstBaseTransformClass *bclass;
1261 GstBaseTransformPrivate *priv;
1262 GstFlowReturn ret = GST_FLOW_OK;
1263 gboolean discard, copymeta;
1264 gsize insize, outsize;
1265 GstCaps *incaps = NULL, *outcaps = NULL;
1267 bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
1273 insize = gst_buffer_get_size (in_buf);
1275 /* figure out how to allocate a buffer based on the current configuration */
1276 if (trans->passthrough) {
1277 GST_DEBUG_OBJECT (trans, "doing passthrough alloc");
1278 /* passthrough, we don't really need to call pad alloc but we still need to
1279 * in order to get upstream negotiation. The output size is the same as the
1282 /* we always alloc and discard here */
1285 gboolean want_in_place = (bclass->transform_ip != NULL)
1286 && trans->always_in_place;
1288 if (want_in_place) {
1289 GST_DEBUG_OBJECT (trans, "doing inplace alloc");
1290 /* we alloc a buffer of the same size as the input */
1292 /* only discard it when the input was not writable, otherwise, we reuse
1293 * the input buffer. */
1294 discard = gst_buffer_is_writable (in_buf);
1295 GST_DEBUG_OBJECT (trans, "discard: %d", discard);
1297 incaps = gst_pad_get_current_caps (trans->sinkpad);
1298 outcaps = gst_pad_get_current_caps (trans->srcpad);
1300 GST_DEBUG_OBJECT (trans, "getting output size for copy transform");
1301 /* copy transform, figure out the output size */
1302 if (!gst_base_transform_transform_size (trans,
1303 GST_PAD_SINK, incaps, insize, outcaps, &outsize)) {
1306 /* never discard this buffer, we need it for storing the output */
1311 if (bclass->prepare_output_buffer) {
1312 if (outcaps == NULL)
1313 outcaps = gst_pad_get_current_caps (trans->srcpad);
1315 GST_DEBUG_OBJECT (trans,
1316 "calling prepare buffer with caps %p %" GST_PTR_FORMAT, outcaps,
1319 bclass->prepare_output_buffer (trans, in_buf, outsize, outcaps,
1322 /* get a new ref to the srcpad caps, the prepare_output_buffer function can
1323 * update the pad caps if it wants */
1325 gst_caps_unref (outcaps);
1326 outcaps = gst_pad_get_current_caps (trans->srcpad);
1329 * decrease refcount again if vmethod returned refcounted in_buf. This
1330 * is because we need to make sure that the buffer is writable for the
1331 * in_place transform. The docs of the vmethod say that you should return
1332 * a reffed inbuf, which is exactly what we don't want :), oh well.. */
1333 if (in_buf == *out_buf)
1334 gst_buffer_unref (in_buf);
1336 /* never discard the buffer from the prepare_buffer method */
1337 if (*out_buf != NULL)
1341 if (ret != GST_FLOW_OK)
1344 if (*out_buf == NULL) {
1345 if (trans->passthrough) {
1346 GST_DEBUG_OBJECT (trans, "Avoiding pad alloc");
1347 *out_buf = gst_buffer_ref (in_buf);
1349 GST_DEBUG_OBJECT (trans, "doing alloc of size %u", outsize);
1351 *out_buf = gst_buffer_new_and_alloc (outsize);
1355 /* must always have a buffer by now */
1356 if (*out_buf == NULL)
1360 if (*out_buf == NULL) {
1362 GST_DEBUG_OBJECT (trans, "make default output buffer of size %d",
1364 /* no valid buffer yet, make one, metadata is writable */
1365 *out_buf = gst_buffer_new_and_alloc (outsize);
1366 gst_buffer_copy_into (*out_buf, in_buf,
1367 GST_BUFFER_COPY_FLAGS | GST_BUFFER_COPY_TIMESTAMPS, 0, -1);
1369 GST_DEBUG_OBJECT (trans, "reuse input buffer");
1373 if (trans->passthrough && in_buf != *out_buf) {
1374 /* we are asked to perform a passthrough transform but the input and
1375 * output buffers are different. We have to discard the output buffer and
1376 * reuse the input buffer. */
1377 GST_DEBUG_OBJECT (trans, "passthrough but different buffers");
1381 GST_DEBUG_OBJECT (trans, "discard buffer, reuse input buffer");
1382 gst_buffer_unref (*out_buf);
1385 GST_DEBUG_OBJECT (trans, "using allocated buffer in %p, out %p", in_buf,
1387 /* if we have different buffers, check if the metadata is ok */
1388 if (*out_buf != in_buf) {
1391 mask = GST_BUFFER_FLAG_PREROLL | GST_BUFFER_FLAG_IN_CAPS |
1392 GST_BUFFER_FLAG_DELTA_UNIT | GST_BUFFER_FLAG_DISCONT |
1393 GST_BUFFER_FLAG_GAP | GST_BUFFER_FLAG_MEDIA1 |
1394 GST_BUFFER_FLAG_MEDIA2 | GST_BUFFER_FLAG_MEDIA3;
1395 /* see if the flags and timestamps match */
1397 (GST_MINI_OBJECT_FLAGS (*out_buf) & mask) ==
1398 (GST_MINI_OBJECT_FLAGS (in_buf) & mask);
1400 GST_BUFFER_TIMESTAMP (*out_buf) != GST_BUFFER_TIMESTAMP (in_buf) ||
1401 GST_BUFFER_DURATION (*out_buf) != GST_BUFFER_DURATION (in_buf) ||
1402 GST_BUFFER_OFFSET (*out_buf) != GST_BUFFER_OFFSET (in_buf) ||
1403 GST_BUFFER_OFFSET_END (*out_buf) != GST_BUFFER_OFFSET_END (in_buf);
1408 /* we need to modify the metadata when the element is not gap aware,
1409 * passthrough is not used and the gap flag is set */
1410 copymeta |= !trans->priv->gap_aware && !trans->passthrough
1411 && (GST_MINI_OBJECT_FLAGS (*out_buf) & GST_BUFFER_FLAG_GAP);
1414 GST_DEBUG_OBJECT (trans, "copymeta %d", copymeta);
1415 if (!gst_buffer_is_writable (*out_buf)) {
1416 GST_DEBUG_OBJECT (trans, "buffer %p not writable", *out_buf);
1417 if (in_buf == *out_buf)
1418 *out_buf = gst_buffer_copy (in_buf);
1420 *out_buf = gst_buffer_make_writable (*out_buf);
1422 /* when we get here, the metadata should be writable */
1424 gst_buffer_copy_into (*out_buf, in_buf,
1425 GST_BUFFER_COPY_FLAGS | GST_BUFFER_COPY_TIMESTAMPS, 0, -1);
1426 /* clear the GAP flag when the subclass does not understand it */
1427 if (!trans->priv->gap_aware)
1428 GST_BUFFER_FLAG_UNSET (*out_buf, GST_BUFFER_FLAG_GAP);
1433 gst_caps_unref (incaps);
1435 gst_caps_unref (outcaps);
1442 GST_WARNING_OBJECT (trans, "pad-alloc failed: %s", gst_flow_get_name (ret));
1447 GST_ELEMENT_ERROR (trans, STREAM, NOT_IMPLEMENTED,
1448 ("Sub-class failed to provide an output buffer"), (NULL));
1449 ret = GST_FLOW_ERROR;
1454 GST_ERROR_OBJECT (trans, "unknown output size");
1455 ret = GST_FLOW_ERROR;
1460 /* Given @caps calcultate the size of one unit.
1462 * For video caps, this is the size of one frame (and thus one buffer).
1463 * For audio caps, this is the size of one sample.
1465 * These values are cached since they do not change and the calculation
1466 * potentially involves parsing caps and other expensive stuff.
1468 * We have two cache locations to store the size, one for the source caps
1469 * and one for the sink caps.
1471 * this function returns FALSE if no size could be calculated.
1474 gst_base_transform_get_unit_size (GstBaseTransform * trans, GstCaps * caps,
1477 gboolean res = FALSE;
1478 GstBaseTransformClass *bclass;
1480 /* see if we have the result cached */
1481 if (trans->cache_caps1 == caps) {
1482 *size = trans->cache_caps1_size;
1483 GST_DEBUG_OBJECT (trans, "returned %d from first cache", *size);
1486 if (trans->cache_caps2 == caps) {
1487 *size = trans->cache_caps2_size;
1488 GST_DEBUG_OBJECT (trans, "returned %d from second cached", *size);
1492 bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
1493 if (bclass->get_unit_size) {
1494 res = bclass->get_unit_size (trans, caps, size);
1495 GST_DEBUG_OBJECT (trans, "caps %" GST_PTR_FORMAT
1496 ") has unit size %d, result %s", caps, *size, res ? "TRUE" : "FALSE");
1499 /* and cache the values */
1500 if (trans->cache_caps1 == NULL) {
1501 gst_caps_replace (&trans->cache_caps1, caps);
1502 trans->cache_caps1_size = *size;
1503 GST_DEBUG_OBJECT (trans, "caching %d in first cache", *size);
1504 } else if (trans->cache_caps2 == NULL) {
1505 gst_caps_replace (&trans->cache_caps2, caps);
1506 trans->cache_caps2_size = *size;
1507 GST_DEBUG_OBJECT (trans, "caching %d in second cache", *size);
1509 GST_DEBUG_OBJECT (trans, "no free spot to cache unit_size");
1513 GST_DEBUG_OBJECT (trans, "Sub-class does not implement get_unit_size");
1519 gst_base_transform_sink_event (GstPad * pad, GstEvent * event)
1521 GstBaseTransform *trans;
1522 GstBaseTransformClass *bclass;
1523 gboolean ret = TRUE;
1524 gboolean forward = TRUE;
1526 trans = GST_BASE_TRANSFORM (gst_pad_get_parent (pad));
1527 if (G_UNLIKELY (trans == NULL)) {
1528 gst_event_unref (event);
1531 bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
1534 forward = bclass->event (trans, event);
1536 /* FIXME, do this in the default event handler so the subclass can do
1537 * something different. */
1539 ret = gst_pad_push_event (trans->srcpad, event);
1541 gst_event_unref (event);
1543 gst_object_unref (trans);
1549 gst_base_transform_sink_eventfunc (GstBaseTransform * trans, GstEvent * event)
1551 gboolean forward = TRUE;
1553 switch (GST_EVENT_TYPE (event)) {
1554 case GST_EVENT_FLUSH_START:
1556 case GST_EVENT_FLUSH_STOP:
1557 GST_OBJECT_LOCK (trans);
1558 /* reset QoS parameters */
1559 trans->priv->proportion = 1.0;
1560 trans->priv->earliest_time = -1;
1561 trans->priv->discont = FALSE;
1562 trans->priv->processed = 0;
1563 trans->priv->dropped = 0;
1564 GST_OBJECT_UNLOCK (trans);
1565 /* we need new segment info after the flush. */
1566 trans->have_segment = FALSE;
1567 gst_segment_init (&trans->segment, GST_FORMAT_UNDEFINED);
1568 trans->priv->position_out = GST_CLOCK_TIME_NONE;
1574 case GST_EVENT_CAPS:
1578 gst_event_parse_caps (event, &caps);
1579 gst_base_transform_setcaps (trans, trans->sinkpad, caps);
1584 case GST_EVENT_SEGMENT:
1586 gst_event_parse_segment (event, &trans->segment);
1587 trans->have_segment = TRUE;
1589 GST_DEBUG_OBJECT (trans, "received SEGMENT %" GST_SEGMENT_FORMAT,
1601 gst_base_transform_src_event (GstPad * pad, GstEvent * event)
1603 GstBaseTransform *trans;
1604 GstBaseTransformClass *bclass;
1605 gboolean ret = TRUE;
1607 trans = GST_BASE_TRANSFORM (gst_pad_get_parent (pad));
1608 if (G_UNLIKELY (trans == NULL)) {
1609 gst_event_unref (event);
1613 bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
1615 if (bclass->src_event)
1616 ret = bclass->src_event (trans, event);
1618 gst_event_unref (event);
1620 gst_object_unref (trans);
1626 gst_base_transform_src_eventfunc (GstBaseTransform * trans, GstEvent * event)
1630 GST_DEBUG_OBJECT (trans, "handling event %p %" GST_PTR_FORMAT, event, event);
1632 switch (GST_EVENT_TYPE (event)) {
1633 case GST_EVENT_SEEK:
1635 case GST_EVENT_NAVIGATION:
1640 GstClockTimeDiff diff;
1641 GstClockTime timestamp;
1643 gst_event_parse_qos (event, NULL, &proportion, &diff, ×tamp);
1644 gst_base_transform_update_qos (trans, proportion, diff, timestamp);
1651 ret = gst_pad_push_event (trans->sinkpad, event);
1656 /* perform a transform on @inbuf and put the result in @outbuf.
1658 * This function is common to the push and pull-based operations.
1660 * This function takes ownership of @inbuf */
1661 static GstFlowReturn
1662 gst_base_transform_handle_buffer (GstBaseTransform * trans, GstBuffer * inbuf,
1663 GstBuffer ** outbuf)
1665 GstBaseTransformClass *bclass;
1666 GstFlowReturn ret = GST_FLOW_OK;
1667 gboolean want_in_place;
1668 GstClockTime running_time;
1669 GstClockTime timestamp;
1671 gboolean reconfigure;
1673 bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
1675 GST_OBJECT_LOCK (trans->sinkpad);
1676 reconfigure = GST_PAD_NEEDS_RECONFIGURE (trans->srcpad)
1677 || trans->priv->reconfigure;
1678 GST_OBJECT_FLAG_UNSET (trans->srcpad, GST_PAD_NEED_RECONFIGURE);
1679 trans->priv->reconfigure = FALSE;
1680 GST_OBJECT_UNLOCK (trans->sinkpad);
1682 if (G_UNLIKELY (reconfigure)) {
1685 GST_DEBUG_OBJECT (trans, "we had a pending reconfigure");
1687 incaps = gst_pad_get_current_caps (trans->sinkpad);
1689 goto no_reconfigure;
1691 /* if we need to reconfigure we pretend a buffer with new caps arrived. This
1692 * will reconfigure the transform with the new output format. We can only
1693 * do this if the buffer actually has caps. */
1694 if (!gst_base_transform_setcaps (trans, trans->sinkpad, incaps)) {
1695 gst_caps_unref (incaps);
1696 goto not_negotiated;
1698 gst_caps_unref (incaps);
1702 insize = gst_buffer_get_size (inbuf);
1704 if (GST_BUFFER_OFFSET_IS_VALID (inbuf))
1705 GST_DEBUG_OBJECT (trans,
1706 "handling buffer %p of size %" G_GSIZE_FORMAT " and offset %"
1707 G_GUINT64_FORMAT, inbuf, insize, GST_BUFFER_OFFSET (inbuf));
1709 GST_DEBUG_OBJECT (trans,
1710 "handling buffer %p of size %" G_GSIZE_FORMAT " and offset NONE", inbuf,
1713 /* Don't allow buffer handling before negotiation, except in passthrough mode
1714 * or if the class doesn't implement a set_caps function (in which case it doesn't
1717 if (!trans->negotiated && !trans->passthrough && (bclass->set_caps != NULL))
1718 goto not_negotiated;
1720 /* Set discont flag so we can mark the outgoing buffer */
1721 if (GST_BUFFER_IS_DISCONT (inbuf)) {
1722 GST_DEBUG_OBJECT (trans, "got DISCONT buffer %p", inbuf);
1723 trans->priv->discont = TRUE;
1726 /* can only do QoS if the segment is in TIME */
1727 if (trans->segment.format != GST_FORMAT_TIME)
1730 /* QOS is done on the running time of the buffer, get it now */
1731 timestamp = GST_BUFFER_TIMESTAMP (inbuf);
1732 running_time = gst_segment_to_running_time (&trans->segment, GST_FORMAT_TIME,
1735 if (running_time != -1) {
1737 GstClockTime earliest_time;
1740 /* lock for getting the QoS parameters that are set (in a different thread)
1741 * with the QOS events */
1742 GST_OBJECT_LOCK (trans);
1743 earliest_time = trans->priv->earliest_time;
1744 proportion = trans->priv->proportion;
1745 /* check for QoS, don't perform conversion for buffers
1746 * that are known to be late. */
1747 need_skip = trans->priv->qos_enabled &&
1748 earliest_time != -1 && running_time <= earliest_time;
1749 GST_OBJECT_UNLOCK (trans);
1752 GstMessage *qos_msg;
1753 GstClockTime duration;
1754 guint64 stream_time;
1757 GST_CAT_DEBUG_OBJECT (GST_CAT_QOS, trans, "skipping transform: qostime %"
1758 GST_TIME_FORMAT " <= %" GST_TIME_FORMAT,
1759 GST_TIME_ARGS (running_time), GST_TIME_ARGS (earliest_time));
1761 trans->priv->dropped++;
1763 duration = GST_BUFFER_DURATION (inbuf);
1765 gst_segment_to_stream_time (&trans->segment, GST_FORMAT_TIME,
1767 jitter = GST_CLOCK_DIFF (running_time, earliest_time);
1770 gst_message_new_qos (GST_OBJECT_CAST (trans), FALSE, running_time,
1771 stream_time, timestamp, duration);
1772 gst_message_set_qos_values (qos_msg, jitter, proportion, 1000000);
1773 gst_message_set_qos_stats (qos_msg, GST_FORMAT_BUFFERS,
1774 trans->priv->processed, trans->priv->dropped);
1775 gst_element_post_message (GST_ELEMENT_CAST (trans), qos_msg);
1777 /* mark discont for next buffer */
1778 trans->priv->discont = TRUE;
1785 /* first try to allocate an output buffer based on the currently negotiated
1786 * format. outbuf will contain a buffer suitable for doing the configured
1787 * transform after this function. */
1788 ret = gst_base_transform_prepare_output_buffer (trans, inbuf, outbuf);
1789 if (G_UNLIKELY (ret != GST_FLOW_OK))
1792 /* now perform the needed transform */
1793 if (trans->passthrough) {
1794 /* In passthrough mode, give transform_ip a look at the
1795 * buffer, without making it writable, or just push the
1797 if (bclass->transform_ip) {
1798 GST_DEBUG_OBJECT (trans, "doing passthrough transform");
1799 ret = bclass->transform_ip (trans, *outbuf);
1801 GST_DEBUG_OBJECT (trans, "element is in passthrough");
1804 want_in_place = (bclass->transform_ip != NULL) && trans->always_in_place;
1806 if (want_in_place) {
1807 GST_DEBUG_OBJECT (trans, "doing inplace transform");
1809 if (inbuf != *outbuf) {
1810 guint8 *indata, *outdata;
1811 gsize insize, outsize;
1813 /* Different buffer. The data can still be the same when we are dealing
1814 * with subbuffers of the same buffer. Note that because of the FIXME in
1815 * prepare_output_buffer() we have decreased the refcounts of inbuf and
1816 * outbuf to keep them writable */
1817 indata = gst_buffer_map (inbuf, &insize, NULL, GST_MAP_READ);
1818 outdata = gst_buffer_map (*outbuf, &outsize, NULL, GST_MAP_WRITE);
1820 if (indata != outdata)
1821 memcpy (outdata, indata, insize);
1823 gst_buffer_unmap (inbuf, indata, insize);
1824 gst_buffer_unmap (*outbuf, outdata, outsize);
1826 ret = bclass->transform_ip (trans, *outbuf);
1828 GST_DEBUG_OBJECT (trans, "doing non-inplace transform");
1830 if (bclass->transform)
1831 ret = bclass->transform (trans, inbuf, *outbuf);
1833 ret = GST_FLOW_NOT_SUPPORTED;
1838 /* only unref input buffer if we allocated a new outbuf buffer */
1839 if (*outbuf != inbuf)
1840 gst_buffer_unref (inbuf);
1847 gst_buffer_unref (inbuf);
1848 GST_ELEMENT_ERROR (trans, STREAM, NOT_IMPLEMENTED,
1849 ("not negotiated"), ("not negotiated"));
1850 return GST_FLOW_NOT_NEGOTIATED;
1854 gst_buffer_unref (inbuf);
1856 GST_WARNING_OBJECT (trans, "could not get buffer from pool: %s",
1857 gst_flow_get_name (ret));
1863 gst_base_transform_check_get_range (GstPad * pad)
1865 GstBaseTransform *trans;
1868 trans = GST_BASE_TRANSFORM (gst_pad_get_parent (pad));
1870 ret = gst_pad_check_pull_range (trans->sinkpad);
1872 gst_object_unref (trans);
1877 /* FIXME, getrange is broken, need to pull range from the other
1878 * end based on the transform_size result.
1880 static GstFlowReturn
1881 gst_base_transform_getrange (GstPad * pad, guint64 offset,
1882 guint length, GstBuffer ** buffer)
1884 GstBaseTransform *trans;
1885 GstBaseTransformClass *klass;
1889 trans = GST_BASE_TRANSFORM (gst_pad_get_parent (pad));
1891 ret = gst_pad_pull_range (trans->sinkpad, offset, length, &inbuf);
1892 if (G_UNLIKELY (ret != GST_FLOW_OK))
1895 klass = GST_BASE_TRANSFORM_GET_CLASS (trans);
1896 if (klass->before_transform)
1897 klass->before_transform (trans, inbuf);
1899 GST_BASE_TRANSFORM_LOCK (trans);
1900 ret = gst_base_transform_handle_buffer (trans, inbuf, buffer);
1901 GST_BASE_TRANSFORM_UNLOCK (trans);
1904 gst_object_unref (trans);
1911 GST_DEBUG_OBJECT (trans, "failed to pull a buffer: %s",
1912 gst_flow_get_name (ret));
1917 static GstFlowReturn
1918 gst_base_transform_chain (GstPad * pad, GstBuffer * buffer)
1920 GstBaseTransform *trans;
1921 GstBaseTransformClass *klass;
1923 GstClockTime position = GST_CLOCK_TIME_NONE;
1924 GstClockTime timestamp, duration;
1925 GstBuffer *outbuf = NULL;
1927 trans = GST_BASE_TRANSFORM (GST_OBJECT_PARENT (pad));
1929 timestamp = GST_BUFFER_TIMESTAMP (buffer);
1930 duration = GST_BUFFER_DURATION (buffer);
1932 /* calculate end position of the incoming buffer */
1933 if (timestamp != GST_CLOCK_TIME_NONE) {
1934 if (duration != GST_CLOCK_TIME_NONE)
1935 position = timestamp + duration;
1937 position = timestamp;
1940 klass = GST_BASE_TRANSFORM_GET_CLASS (trans);
1941 if (klass->before_transform)
1942 klass->before_transform (trans, buffer);
1944 /* protect transform method and concurrent buffer alloc */
1945 GST_BASE_TRANSFORM_LOCK (trans);
1946 ret = gst_base_transform_handle_buffer (trans, buffer, &outbuf);
1947 GST_BASE_TRANSFORM_UNLOCK (trans);
1949 /* outbuf can be NULL, this means a dropped buffer, if we have a buffer but
1950 * GST_BASE_TRANSFORM_FLOW_DROPPED we will not push either. */
1951 if (outbuf != NULL) {
1952 if ((ret == GST_FLOW_OK)) {
1953 GstClockTime position_out = GST_CLOCK_TIME_NONE;
1955 /* Remember last stop position */
1956 if (position != GST_CLOCK_TIME_NONE &&
1957 trans->segment.format == GST_FORMAT_TIME)
1958 trans->segment.position = position;
1960 if (GST_BUFFER_TIMESTAMP_IS_VALID (outbuf)) {
1961 position_out = GST_BUFFER_TIMESTAMP (outbuf);
1962 if (GST_BUFFER_DURATION_IS_VALID (outbuf))
1963 position_out += GST_BUFFER_DURATION (outbuf);
1964 } else if (position != GST_CLOCK_TIME_NONE) {
1965 position_out = position;
1967 if (position_out != GST_CLOCK_TIME_NONE
1968 && trans->segment.format == GST_FORMAT_TIME)
1969 trans->priv->position_out = position_out;
1971 /* apply DISCONT flag if the buffer is not yet marked as such */
1972 if (trans->priv->discont) {
1973 if (!GST_BUFFER_IS_DISCONT (outbuf)) {
1974 outbuf = gst_buffer_make_writable (outbuf);
1975 GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DISCONT);
1977 trans->priv->discont = FALSE;
1979 trans->priv->processed++;
1980 ret = gst_pad_push (trans->srcpad, outbuf);
1982 gst_buffer_unref (outbuf);
1986 /* convert internal flow to OK and mark discont for the next buffer. */
1987 if (ret == GST_BASE_TRANSFORM_FLOW_DROPPED) {
1988 trans->priv->discont = TRUE;
1996 gst_base_transform_set_property (GObject * object, guint prop_id,
1997 const GValue * value, GParamSpec * pspec)
1999 GstBaseTransform *trans;
2001 trans = GST_BASE_TRANSFORM (object);
2005 gst_base_transform_set_qos_enabled (trans, g_value_get_boolean (value));
2008 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
2014 gst_base_transform_get_property (GObject * object, guint prop_id,
2015 GValue * value, GParamSpec * pspec)
2017 GstBaseTransform *trans;
2019 trans = GST_BASE_TRANSFORM (object);
2023 g_value_set_boolean (value, gst_base_transform_is_qos_enabled (trans));
2026 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
2031 /* not a vmethod of anything, just an internal method */
2033 gst_base_transform_activate (GstBaseTransform * trans, gboolean active)
2035 GstBaseTransformClass *bclass;
2036 gboolean result = TRUE;
2038 bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
2041 GstCaps *incaps, *outcaps;
2043 if (trans->priv->pad_mode == GST_ACTIVATE_NONE && bclass->start)
2044 result &= bclass->start (trans);
2046 incaps = gst_pad_get_current_caps (trans->sinkpad);
2047 outcaps = gst_pad_get_current_caps (trans->srcpad);
2049 GST_OBJECT_LOCK (trans);
2050 if (incaps && outcaps)
2051 trans->have_same_caps =
2052 gst_caps_is_equal (incaps, outcaps) || trans->passthrough;
2054 trans->have_same_caps = trans->passthrough;
2055 GST_DEBUG_OBJECT (trans, "have_same_caps %d", trans->have_same_caps);
2056 trans->negotiated = FALSE;
2057 trans->have_segment = FALSE;
2058 gst_segment_init (&trans->segment, GST_FORMAT_UNDEFINED);
2059 trans->priv->position_out = GST_CLOCK_TIME_NONE;
2060 trans->priv->proportion = 1.0;
2061 trans->priv->earliest_time = -1;
2062 trans->priv->discont = FALSE;
2063 trans->priv->processed = 0;
2064 trans->priv->dropped = 0;
2065 GST_OBJECT_UNLOCK (trans);
2068 gst_caps_unref (incaps);
2070 gst_caps_unref (outcaps);
2072 /* We must make sure streaming has finished before resetting things
2073 * and calling the ::stop vfunc */
2074 GST_PAD_STREAM_LOCK (trans->sinkpad);
2075 GST_PAD_STREAM_UNLOCK (trans->sinkpad);
2077 trans->have_same_caps = FALSE;
2078 /* We can only reset the passthrough mode if the instance told us to
2079 handle it in configure_caps */
2080 if (bclass->passthrough_on_same_caps) {
2081 gst_base_transform_set_passthrough (trans, FALSE);
2083 gst_caps_replace (&trans->cache_caps1, NULL);
2084 gst_caps_replace (&trans->cache_caps2, NULL);
2086 if (trans->priv->pad_mode != GST_ACTIVATE_NONE && bclass->stop)
2087 result &= bclass->stop (trans);
2094 gst_base_transform_sink_activate_push (GstPad * pad, gboolean active)
2096 gboolean result = TRUE;
2097 GstBaseTransform *trans;
2099 trans = GST_BASE_TRANSFORM (gst_pad_get_parent (pad));
2101 result = gst_base_transform_activate (trans, active);
2104 trans->priv->pad_mode = active ? GST_ACTIVATE_PUSH : GST_ACTIVATE_NONE;
2106 gst_object_unref (trans);
2112 gst_base_transform_src_activate_pull (GstPad * pad, gboolean active)
2114 gboolean result = FALSE;
2115 GstBaseTransform *trans;
2117 trans = GST_BASE_TRANSFORM (gst_pad_get_parent (pad));
2119 result = gst_pad_activate_pull (trans->sinkpad, active);
2122 result &= gst_base_transform_activate (trans, active);
2125 trans->priv->pad_mode = active ? GST_ACTIVATE_PULL : GST_ACTIVATE_NONE;
2127 gst_object_unref (trans);
2133 * gst_base_transform_set_passthrough:
2134 * @trans: the #GstBaseTransform to set
2135 * @passthrough: boolean indicating passthrough mode.
2137 * Set passthrough mode for this filter by default. This is mostly
2138 * useful for filters that do not care about negotiation.
2140 * Always TRUE for filters which don't implement either a transform
2141 * or transform_ip method.
2146 gst_base_transform_set_passthrough (GstBaseTransform * trans,
2147 gboolean passthrough)
2149 GstBaseTransformClass *bclass;
2151 g_return_if_fail (GST_IS_BASE_TRANSFORM (trans));
2153 bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
2155 GST_OBJECT_LOCK (trans);
2156 if (passthrough == FALSE) {
2157 if (bclass->transform_ip || bclass->transform)
2158 trans->passthrough = FALSE;
2160 trans->passthrough = TRUE;
2163 GST_DEBUG_OBJECT (trans, "set passthrough %d", trans->passthrough);
2164 GST_OBJECT_UNLOCK (trans);
2168 * gst_base_transform_is_passthrough:
2169 * @trans: the #GstBaseTransform to query
2171 * See if @trans is configured as a passthrough transform.
2173 * Returns: TRUE is the transform is configured in passthrough mode.
2178 gst_base_transform_is_passthrough (GstBaseTransform * trans)
2182 g_return_val_if_fail (GST_IS_BASE_TRANSFORM (trans), FALSE);
2184 GST_OBJECT_LOCK (trans);
2185 result = trans->passthrough;
2186 GST_OBJECT_UNLOCK (trans);
2192 * gst_base_transform_set_in_place:
2193 * @trans: the #GstBaseTransform to modify
2194 * @in_place: Boolean value indicating that we would like to operate
2195 * on in_place buffers.
2197 * Determines whether a non-writable buffer will be copied before passing
2198 * to the transform_ip function.
2200 * <listitem>Always TRUE if no transform function is implemented.</listitem>
2201 * <listitem>Always FALSE if ONLY transform function is implemented.</listitem>
2207 gst_base_transform_set_in_place (GstBaseTransform * trans, gboolean in_place)
2209 GstBaseTransformClass *bclass;
2211 g_return_if_fail (GST_IS_BASE_TRANSFORM (trans));
2213 bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
2215 GST_OBJECT_LOCK (trans);
2218 if (bclass->transform_ip) {
2219 GST_DEBUG_OBJECT (trans, "setting in_place TRUE");
2220 trans->always_in_place = TRUE;
2223 if (bclass->transform) {
2224 GST_DEBUG_OBJECT (trans, "setting in_place FALSE");
2225 trans->always_in_place = FALSE;
2229 GST_OBJECT_UNLOCK (trans);
2233 * gst_base_transform_is_in_place:
2234 * @trans: the #GstBaseTransform to query
2236 * See if @trans is configured as a in_place transform.
2238 * Returns: TRUE is the transform is configured in in_place mode.
2243 gst_base_transform_is_in_place (GstBaseTransform * trans)
2247 g_return_val_if_fail (GST_IS_BASE_TRANSFORM (trans), FALSE);
2249 GST_OBJECT_LOCK (trans);
2250 result = trans->always_in_place;
2251 GST_OBJECT_UNLOCK (trans);
2257 * gst_base_transform_update_qos:
2258 * @trans: a #GstBaseTransform
2259 * @proportion: the proportion
2260 * @diff: the diff against the clock
2261 * @timestamp: the timestamp of the buffer generating the QoS expressed in
2264 * Set the QoS parameters in the transform. This function is called internally
2265 * when a QOS event is received but subclasses can provide custom information
2273 gst_base_transform_update_qos (GstBaseTransform * trans,
2274 gdouble proportion, GstClockTimeDiff diff, GstClockTime timestamp)
2277 g_return_if_fail (GST_IS_BASE_TRANSFORM (trans));
2279 GST_CAT_DEBUG_OBJECT (GST_CAT_QOS, trans,
2280 "qos: proportion: %lf, diff %" G_GINT64_FORMAT ", timestamp %"
2281 GST_TIME_FORMAT, proportion, diff, GST_TIME_ARGS (timestamp));
2283 GST_OBJECT_LOCK (trans);
2284 trans->priv->proportion = proportion;
2285 trans->priv->earliest_time = timestamp + diff;
2286 GST_OBJECT_UNLOCK (trans);
2290 * gst_base_transform_set_qos_enabled:
2291 * @trans: a #GstBaseTransform
2292 * @enabled: new state
2294 * Enable or disable QoS handling in the transform.
2301 gst_base_transform_set_qos_enabled (GstBaseTransform * trans, gboolean enabled)
2303 g_return_if_fail (GST_IS_BASE_TRANSFORM (trans));
2305 GST_CAT_DEBUG_OBJECT (GST_CAT_QOS, trans, "enabled: %d", enabled);
2307 GST_OBJECT_LOCK (trans);
2308 trans->priv->qos_enabled = enabled;
2309 GST_OBJECT_UNLOCK (trans);
2313 * gst_base_transform_is_qos_enabled:
2314 * @trans: a #GstBaseTransform
2316 * Queries if the transform will handle QoS.
2318 * Returns: TRUE if QoS is enabled.
2325 gst_base_transform_is_qos_enabled (GstBaseTransform * trans)
2329 g_return_val_if_fail (GST_IS_BASE_TRANSFORM (trans), FALSE);
2331 GST_OBJECT_LOCK (trans);
2332 result = trans->priv->qos_enabled;
2333 GST_OBJECT_UNLOCK (trans);
2339 * gst_base_transform_set_gap_aware:
2340 * @trans: a #GstBaseTransform
2341 * @gap_aware: New state
2343 * If @gap_aware is %FALSE (the default), output buffers will have the
2344 * %GST_BUFFER_FLAG_GAP flag unset.
2346 * If set to %TRUE, the element must handle output buffers with this flag set
2347 * correctly, i.e. it can assume that the buffer contains neutral data but must
2348 * unset the flag if the output is no neutral data.
2355 gst_base_transform_set_gap_aware (GstBaseTransform * trans, gboolean gap_aware)
2357 g_return_if_fail (GST_IS_BASE_TRANSFORM (trans));
2359 GST_OBJECT_LOCK (trans);
2360 trans->priv->gap_aware = gap_aware;
2361 GST_DEBUG_OBJECT (trans, "set gap aware %d", trans->priv->gap_aware);
2362 GST_OBJECT_UNLOCK (trans);
2366 * gst_base_transform_suggest:
2367 * @trans: a #GstBaseTransform
2368 * @caps: (transfer none): caps to suggest
2369 * @size: buffer size to suggest
2371 * Instructs @trans to suggest new @caps upstream. A copy of @caps will be
2377 gst_base_transform_suggest (GstBaseTransform * trans, GstCaps * caps,
2380 g_return_if_fail (GST_IS_BASE_TRANSFORM (trans));
2382 /* push the renegotiate event */
2383 if (!gst_pad_push_event (GST_BASE_TRANSFORM_SINK_PAD (trans),
2384 gst_event_new_reconfigure ()))
2385 GST_DEBUG_OBJECT (trans, "Renegotiate event wasn't handled");
2389 * gst_base_transform_reconfigure:
2390 * @trans: a #GstBaseTransform
2392 * Instructs @trans to renegotiate a new downstream transform on the next
2393 * buffer. This function is typically called after properties on the transform
2394 * were set that influence the output format.
2399 gst_base_transform_reconfigure (GstBaseTransform * trans)
2401 g_return_if_fail (GST_IS_BASE_TRANSFORM (trans));
2403 GST_OBJECT_LOCK (trans);
2404 GST_DEBUG_OBJECT (trans, "marking reconfigure");
2405 trans->priv->reconfigure = TRUE;
2406 GST_OBJECT_UNLOCK (trans);