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., 51 Franklin St, Fifth Floor,
21 * Boston, MA 02110-1301, 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. Elements
30 * that are suitable for implementation using #GstBaseTransform are ones
31 * where the size and caps of the output is known entirely from the input
32 * caps and buffer sizes. These include elements that directly transform
33 * one buffer into another, modify the contents of a buffer in-place, as
34 * well as elements that collate multiple input buffers into one output buffer,
35 * or that expand one input buffer into multiple output buffers. See below
36 * for more concrete use cases.
40 * <listitem><para>one sinkpad and one srcpad</para></listitem>
42 * Possible formats on sink and source pad implemented
43 * with custom transform_caps function. By default uses
44 * same format on sink and source.
46 * <listitem><para>Handles state changes</para></listitem>
47 * <listitem><para>Does flushing</para></listitem>
48 * <listitem><para>Push mode</para></listitem>
50 * Pull mode if the sub-class transform can operate on arbitrary data
55 * <title>Use Cases</title>
59 * <itemizedlist><title>Passthrough mode</title>
61 * Element has no interest in modifying the buffer. It may want to inspect it,
62 * in which case the element should have a transform_ip function. If there
63 * is no transform_ip function in passthrough mode, the buffer is pushed
67 * The #GstBaseTransformClass.passthrough_on_same_caps variable
68 * will automatically set/unset passthrough based on whether the
69 * element negotiates the same caps on both pads.
72 * #GstBaseTransformClass.passthrough_on_same_caps on an element that
73 * doesn't implement a transform_caps function is useful for elements that
74 * only inspect data (such as level)
78 * <title>Example elements</title>
79 * <listitem>Level</listitem>
80 * <listitem>Videoscale, audioconvert, videoconvert, audioresample in
81 * certain modes.</listitem>
86 * <title>Modifications in-place - input buffer and output buffer are the
89 * The element must implement a transform_ip function.
92 * Output buffer size must <= input buffer size
95 * If the always_in_place flag is set, non-writable buffers will be copied
96 * and passed to the transform_ip function, otherwise a new buffer will be
97 * created and the transform function called.
100 * Incoming writable buffers will be passed to the transform_ip function
101 * immediately. </para></listitem>
103 * only implementing transform_ip and not transform implies always_in_place
108 * <title>Example elements</title>
109 * <listitem>Volume</listitem>
110 * <listitem>Audioconvert in certain modes (signed/unsigned
111 * conversion)</listitem>
112 * <listitem>videoconvert in certain modes (endianness
113 * swapping)</listitem>
118 * <title>Modifications only to the caps/metadata of a buffer</title>
120 * The element does not require writable data, but non-writable buffers
121 * should be subbuffered so that the meta-information can be replaced.
124 * Elements wishing to operate in this mode should replace the
125 * prepare_output_buffer method to create subbuffers of the input buffer
126 * and set always_in_place to %TRUE
130 * <title>Example elements</title>
131 * <listitem>Capsfilter when setting caps on outgoing buffers that have
133 * <listitem>identity when it is going to re-timestamp buffers by
134 * datarate.</listitem>
138 * <itemizedlist><title>Normal mode</title>
140 * always_in_place flag is not set, or there is no transform_ip function
143 * Element will receive an input buffer and output buffer to operate on.
146 * Output buffer is allocated by calling the prepare_output_buffer function.
150 * <title>Example elements</title>
151 * <listitem>Videoscale, videoconvert, audioconvert when doing
152 * scaling/conversions</listitem>
156 * <itemizedlist><title>Special output buffer allocations</title>
158 * Elements which need to do special allocation of their output buffers
159 * beyond allocating output buffers via the negotiated allocator or
160 * buffer pool should implement the prepare_output_buffer method.
164 * <title>Example elements</title>
165 * <listitem>efence</listitem>
172 * <title>Sub-class settable flags on GstBaseTransform</title>
176 * <itemizedlist><title>passthrough</title>
178 * Implies that in the current configuration, the sub-class is not
179 * interested in modifying the buffers.
182 * Elements which are always in passthrough mode whenever the same caps
183 * has been negotiated on both pads can set the class variable
184 * passthrough_on_same_caps to have this behaviour automatically.
189 * <itemizedlist><title>always_in_place</title>
191 * Determines whether a non-writable buffer will be copied before passing
192 * to the transform_ip function.
195 * Implied %TRUE if no transform function is implemented.
198 * Implied %FALSE if ONLY transform function is implemented.
214 #include "../../../gst/gst_private.h"
215 #include "../../../gst/gst-i18n-lib.h"
216 #include "../../../gst/glib-compat-private.h"
217 #include "gstbasetransform.h"
219 GST_DEBUG_CATEGORY_STATIC (gst_base_transform_debug);
220 #define GST_CAT_DEFAULT gst_base_transform_debug
222 /* BaseTransform signals and args */
229 #define DEFAULT_PROP_QOS FALSE
237 #define GST_BASE_TRANSFORM_GET_PRIVATE(obj) \
238 (G_TYPE_INSTANCE_GET_PRIVATE ((obj), GST_TYPE_BASE_TRANSFORM, GstBaseTransformPrivate))
240 struct _GstBaseTransformPrivate
242 /* Set by sub-class */
243 gboolean passthrough;
244 gboolean always_in_place;
246 GstCaps *cache_caps1;
247 gsize cache_caps1_size;
248 GstCaps *cache_caps2;
249 gsize cache_caps2_size;
250 gboolean have_same_caps;
254 /* QoS *//* with LOCK */
255 gboolean qos_enabled;
257 GstClockTime earliest_time;
258 /* previous buffer had a discont */
264 gboolean prefer_passthrough;
270 GstClockTime position_out;
273 gboolean pool_active;
274 GstAllocator *allocator;
275 GstAllocationParams params;
280 static GstElementClass *parent_class = NULL;
282 static void gst_base_transform_class_init (GstBaseTransformClass * klass);
283 static void gst_base_transform_init (GstBaseTransform * trans,
284 GstBaseTransformClass * klass);
285 static GstFlowReturn default_submit_input_buffer (GstBaseTransform * trans,
286 gboolean is_discont, GstBuffer * input);
287 static GstFlowReturn default_generate_output (GstBaseTransform * trans,
288 GstBuffer ** outbuf);
290 /* we can't use G_DEFINE_ABSTRACT_TYPE because we need the klass in the _init
291 * method to get to the padtemplates */
293 gst_base_transform_get_type (void)
295 static volatile gsize base_transform_type = 0;
297 if (g_once_init_enter (&base_transform_type)) {
299 static const GTypeInfo base_transform_info = {
300 sizeof (GstBaseTransformClass),
303 (GClassInitFunc) gst_base_transform_class_init,
306 sizeof (GstBaseTransform),
308 (GInstanceInitFunc) gst_base_transform_init,
311 _type = g_type_register_static (GST_TYPE_ELEMENT,
312 "GstBaseTransform", &base_transform_info, G_TYPE_FLAG_ABSTRACT);
313 g_once_init_leave (&base_transform_type, _type);
315 return base_transform_type;
318 static void gst_base_transform_finalize (GObject * object);
319 static void gst_base_transform_set_property (GObject * object, guint prop_id,
320 const GValue * value, GParamSpec * pspec);
321 static void gst_base_transform_get_property (GObject * object, guint prop_id,
322 GValue * value, GParamSpec * pspec);
323 static gboolean gst_base_transform_src_activate_mode (GstPad * pad,
324 GstObject * parent, GstPadMode mode, gboolean active);
325 static gboolean gst_base_transform_sink_activate_mode (GstPad * pad,
326 GstObject * parent, GstPadMode mode, gboolean active);
327 static gboolean gst_base_transform_activate (GstBaseTransform * trans,
329 static gboolean gst_base_transform_get_unit_size (GstBaseTransform * trans,
330 GstCaps * caps, gsize * size);
332 static gboolean gst_base_transform_src_event (GstPad * pad, GstObject * parent,
334 static gboolean gst_base_transform_src_eventfunc (GstBaseTransform * trans,
336 static gboolean gst_base_transform_sink_event (GstPad * pad, GstObject * parent,
338 static gboolean gst_base_transform_sink_eventfunc (GstBaseTransform * trans,
340 static GstFlowReturn gst_base_transform_getrange (GstPad * pad,
341 GstObject * parent, guint64 offset, guint length, GstBuffer ** buffer);
342 static GstFlowReturn gst_base_transform_chain (GstPad * pad, GstObject * parent,
344 static GstCaps *gst_base_transform_default_transform_caps (GstBaseTransform *
345 trans, GstPadDirection direction, GstCaps * caps, GstCaps * filter);
346 static GstCaps *gst_base_transform_default_fixate_caps (GstBaseTransform *
347 trans, GstPadDirection direction, GstCaps * caps, GstCaps * othercaps);
348 static GstCaps *gst_base_transform_query_caps (GstBaseTransform * trans,
349 GstPad * pad, GstCaps * filter);
350 static gboolean gst_base_transform_acceptcaps_default (GstBaseTransform * trans,
351 GstPadDirection direction, GstCaps * caps);
352 static gboolean gst_base_transform_setcaps (GstBaseTransform * trans,
353 GstPad * pad, GstCaps * caps);
354 static gboolean gst_base_transform_default_decide_allocation (GstBaseTransform
355 * trans, GstQuery * query);
356 static gboolean gst_base_transform_default_propose_allocation (GstBaseTransform
357 * trans, GstQuery * decide_query, GstQuery * query);
358 static gboolean gst_base_transform_query (GstPad * pad, GstObject * parent,
360 static gboolean gst_base_transform_default_query (GstBaseTransform * trans,
361 GstPadDirection direction, GstQuery * query);
362 static gboolean gst_base_transform_default_transform_size (GstBaseTransform *
363 trans, GstPadDirection direction, GstCaps * caps, gsize size,
364 GstCaps * othercaps, gsize * othersize);
366 static GstFlowReturn default_prepare_output_buffer (GstBaseTransform * trans,
367 GstBuffer * inbuf, GstBuffer ** outbuf);
368 static gboolean default_copy_metadata (GstBaseTransform * trans,
369 GstBuffer * inbuf, GstBuffer * outbuf);
371 gst_base_transform_default_transform_meta (GstBaseTransform * trans,
372 GstBuffer * inbuf, GstMeta * meta, GstBuffer * outbuf);
374 /* static guint gst_base_transform_signals[LAST_SIGNAL] = { 0 }; */
378 gst_base_transform_finalize (GObject * object)
380 G_OBJECT_CLASS (parent_class)->finalize (object);
384 gst_base_transform_class_init (GstBaseTransformClass * klass)
386 GObjectClass *gobject_class;
388 gobject_class = G_OBJECT_CLASS (klass);
390 GST_DEBUG_CATEGORY_INIT (gst_base_transform_debug, "basetransform", 0,
391 "basetransform element");
393 GST_DEBUG ("gst_base_transform_class_init");
395 g_type_class_add_private (klass, sizeof (GstBaseTransformPrivate));
397 parent_class = g_type_class_peek_parent (klass);
399 gobject_class->set_property = gst_base_transform_set_property;
400 gobject_class->get_property = gst_base_transform_get_property;
402 g_object_class_install_property (gobject_class, PROP_QOS,
403 g_param_spec_boolean ("qos", "QoS", "Handle Quality-of-Service events",
404 DEFAULT_PROP_QOS, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
406 gobject_class->finalize = gst_base_transform_finalize;
408 klass->passthrough_on_same_caps = FALSE;
409 klass->transform_ip_on_passthrough = TRUE;
411 klass->transform_caps =
412 GST_DEBUG_FUNCPTR (gst_base_transform_default_transform_caps);
414 GST_DEBUG_FUNCPTR (gst_base_transform_default_fixate_caps);
416 GST_DEBUG_FUNCPTR (gst_base_transform_acceptcaps_default);
417 klass->query = GST_DEBUG_FUNCPTR (gst_base_transform_default_query);
418 klass->decide_allocation =
419 GST_DEBUG_FUNCPTR (gst_base_transform_default_decide_allocation);
420 klass->propose_allocation =
421 GST_DEBUG_FUNCPTR (gst_base_transform_default_propose_allocation);
422 klass->transform_size =
423 GST_DEBUG_FUNCPTR (gst_base_transform_default_transform_size);
424 klass->transform_meta =
425 GST_DEBUG_FUNCPTR (gst_base_transform_default_transform_meta);
427 klass->sink_event = GST_DEBUG_FUNCPTR (gst_base_transform_sink_eventfunc);
428 klass->src_event = GST_DEBUG_FUNCPTR (gst_base_transform_src_eventfunc);
429 klass->prepare_output_buffer =
430 GST_DEBUG_FUNCPTR (default_prepare_output_buffer);
431 klass->copy_metadata = GST_DEBUG_FUNCPTR (default_copy_metadata);
432 klass->submit_input_buffer = GST_DEBUG_FUNCPTR (default_submit_input_buffer);
433 klass->generate_output = GST_DEBUG_FUNCPTR (default_generate_output);
437 gst_base_transform_init (GstBaseTransform * trans,
438 GstBaseTransformClass * bclass)
440 GstPadTemplate *pad_template;
441 GstBaseTransformPrivate *priv;
443 GST_DEBUG ("gst_base_transform_init");
445 priv = trans->priv = GST_BASE_TRANSFORM_GET_PRIVATE (trans);
448 gst_element_class_get_pad_template (GST_ELEMENT_CLASS (bclass), "sink");
449 g_return_if_fail (pad_template != NULL);
450 trans->sinkpad = gst_pad_new_from_template (pad_template, "sink");
451 gst_pad_set_event_function (trans->sinkpad,
452 GST_DEBUG_FUNCPTR (gst_base_transform_sink_event));
453 gst_pad_set_chain_function (trans->sinkpad,
454 GST_DEBUG_FUNCPTR (gst_base_transform_chain));
455 gst_pad_set_activatemode_function (trans->sinkpad,
456 GST_DEBUG_FUNCPTR (gst_base_transform_sink_activate_mode));
457 gst_pad_set_query_function (trans->sinkpad,
458 GST_DEBUG_FUNCPTR (gst_base_transform_query));
459 gst_element_add_pad (GST_ELEMENT (trans), trans->sinkpad);
462 gst_element_class_get_pad_template (GST_ELEMENT_CLASS (bclass), "src");
463 g_return_if_fail (pad_template != NULL);
464 trans->srcpad = gst_pad_new_from_template (pad_template, "src");
465 gst_pad_set_event_function (trans->srcpad,
466 GST_DEBUG_FUNCPTR (gst_base_transform_src_event));
467 gst_pad_set_getrange_function (trans->srcpad,
468 GST_DEBUG_FUNCPTR (gst_base_transform_getrange));
469 gst_pad_set_activatemode_function (trans->srcpad,
470 GST_DEBUG_FUNCPTR (gst_base_transform_src_activate_mode));
471 gst_pad_set_query_function (trans->srcpad,
472 GST_DEBUG_FUNCPTR (gst_base_transform_query));
473 gst_element_add_pad (GST_ELEMENT (trans), trans->srcpad);
475 priv->qos_enabled = DEFAULT_PROP_QOS;
476 priv->cache_caps1 = NULL;
477 priv->cache_caps2 = NULL;
478 priv->pad_mode = GST_PAD_MODE_NONE;
479 priv->gap_aware = FALSE;
480 priv->prefer_passthrough = TRUE;
482 priv->passthrough = FALSE;
483 if (bclass->transform == NULL) {
484 /* If no transform function, always_in_place is TRUE */
485 GST_DEBUG_OBJECT (trans, "setting in_place TRUE");
486 priv->always_in_place = TRUE;
488 if (bclass->transform_ip == NULL) {
489 GST_DEBUG_OBJECT (trans, "setting passthrough TRUE");
490 priv->passthrough = TRUE;
499 gst_base_transform_default_transform_caps (GstBaseTransform * trans,
500 GstPadDirection direction, GstCaps * caps, GstCaps * filter)
504 GST_DEBUG_OBJECT (trans, "identity from: %" GST_PTR_FORMAT, caps);
505 /* no transform function, use the identity transform */
507 ret = gst_caps_intersect_full (filter, caps, GST_CAPS_INTERSECT_FIRST);
509 ret = gst_caps_ref (caps);
514 /* given @caps on the src or sink pad (given by @direction)
515 * calculate the possible caps on the other pad.
517 * Returns new caps, unref after usage.
520 gst_base_transform_transform_caps (GstBaseTransform * trans,
521 GstPadDirection direction, GstCaps * caps, GstCaps * filter)
524 GstBaseTransformClass *klass;
529 klass = GST_BASE_TRANSFORM_GET_CLASS (trans);
531 /* if there is a custom transform function, use this */
532 if (klass->transform_caps) {
533 GST_DEBUG_OBJECT (trans, "transform caps (direction = %d)", direction);
535 GST_LOG_OBJECT (trans, "from: %" GST_PTR_FORMAT, caps);
536 ret = klass->transform_caps (trans, direction, caps, filter);
537 GST_LOG_OBJECT (trans, " to: %" GST_PTR_FORMAT, ret);
539 #ifndef G_DISABLE_ASSERT
541 if (!gst_caps_is_subset (ret, filter)) {
542 GstCaps *intersection;
544 GST_ERROR_OBJECT (trans,
545 "transform_caps returned caps %" GST_PTR_FORMAT
546 " which are not a real subset of the filter caps %"
547 GST_PTR_FORMAT, ret, filter);
548 g_warning ("%s: transform_caps returned caps which are not a real "
549 "subset of the filter caps", GST_ELEMENT_NAME (trans));
552 gst_caps_intersect_full (filter, ret, GST_CAPS_INTERSECT_FIRST);
553 gst_caps_unref (ret);
560 GST_DEBUG_OBJECT (trans, "to: %" GST_PTR_FORMAT, ret);
566 gst_base_transform_default_transform_meta (GstBaseTransform * trans,
567 GstBuffer * inbuf, GstMeta * meta, GstBuffer * outbuf)
569 const GstMetaInfo *info = meta->info;
570 const gchar *const *tags;
572 tags = gst_meta_api_type_get_tags (info->api);
581 gst_base_transform_default_transform_size (GstBaseTransform * trans,
582 GstPadDirection direction, GstCaps * caps, gsize size,
583 GstCaps * othercaps, gsize * othersize)
585 gsize inunitsize, outunitsize, units;
586 GstBaseTransformClass *klass;
588 klass = GST_BASE_TRANSFORM_GET_CLASS (trans);
590 if (klass->get_unit_size == NULL) {
591 /* if there is no transform_size and no unit_size, it means the
592 * element does not modify the size of a buffer */
595 /* there is no transform_size function, we have to use the unit_size
596 * functions. This method assumes there is a fixed unit_size associated with
597 * each caps. We provide the same amount of units on both sides. */
598 if (!gst_base_transform_get_unit_size (trans, caps, &inunitsize))
601 GST_DEBUG_OBJECT (trans,
602 "input size %" G_GSIZE_FORMAT ", input unit size %" G_GSIZE_FORMAT,
605 /* input size must be a multiple of the unit_size of the input caps */
606 if (inunitsize == 0 || (size % inunitsize != 0))
609 /* get the amount of units */
610 units = size / inunitsize;
612 /* now get the unit size of the output */
613 if (!gst_base_transform_get_unit_size (trans, othercaps, &outunitsize))
616 /* the output size is the unit_size times the amount of units on the
618 *othersize = units * outunitsize;
619 GST_DEBUG_OBJECT (trans, "transformed size to %" G_GSIZE_FORMAT,
627 GST_DEBUG_OBJECT (trans, "could not get in_size");
628 g_warning ("%s: could not get in_size", GST_ELEMENT_NAME (trans));
633 GST_DEBUG_OBJECT (trans, "Size %" G_GSIZE_FORMAT " is not a multiple of"
634 "unit size %" G_GSIZE_FORMAT, size, inunitsize);
635 g_warning ("%s: size %" G_GSIZE_FORMAT " is not a multiple of unit size %"
636 G_GSIZE_FORMAT, GST_ELEMENT_NAME (trans), size, inunitsize);
641 GST_DEBUG_OBJECT (trans, "could not get out_size");
642 g_warning ("%s: could not get out_size", GST_ELEMENT_NAME (trans));
647 /* transform a buffer of @size with @caps on the pad with @direction to
648 * the size of a buffer with @othercaps and store the result in @othersize
650 * We have two ways of doing this:
651 * 1) use a custom transform size function, this is for complicated custom
652 * cases with no fixed unit_size.
653 * 2) use the unit_size functions where there is a relationship between the
654 * caps and the size of a buffer.
657 gst_base_transform_transform_size (GstBaseTransform * trans,
658 GstPadDirection direction, GstCaps * caps,
659 gsize size, GstCaps * othercaps, gsize * othersize)
661 GstBaseTransformClass *klass;
662 gboolean ret = FALSE;
664 klass = GST_BASE_TRANSFORM_GET_CLASS (trans);
666 GST_DEBUG_OBJECT (trans,
667 "asked to transform size %" G_GSIZE_FORMAT " for caps %"
668 GST_PTR_FORMAT " to size for caps %" GST_PTR_FORMAT " in direction %s",
669 size, caps, othercaps, direction == GST_PAD_SRC ? "SRC" : "SINK");
671 if (klass->transform_size) {
672 /* if there is a custom transform function, use this */
673 ret = klass->transform_size (trans, direction, caps, size, othercaps,
679 /* get the caps that can be handled by @pad. We perform:
681 * - take the caps of peer of otherpad,
682 * - filter against the padtemplate of otherpad,
683 * - calculate all transforms of remaining caps
684 * - filter against template of @pad
686 * If there is no peer, we simply return the caps of the padtemplate of pad.
689 gst_base_transform_query_caps (GstBaseTransform * trans, GstPad * pad,
693 GstCaps *peercaps = NULL, *caps, *temp, *peerfilter = NULL;
694 GstCaps *templ, *otempl;
696 otherpad = (pad == trans->srcpad) ? trans->sinkpad : trans->srcpad;
698 templ = gst_pad_get_pad_template_caps (pad);
699 otempl = gst_pad_get_pad_template_caps (otherpad);
701 /* first prepare the filter to be send onwards. We need to filter and
702 * transform it to valid caps for the otherpad. */
704 GST_DEBUG_OBJECT (pad, "filter caps %" GST_PTR_FORMAT, filter);
706 /* filtered against our padtemplate of this pad */
707 GST_DEBUG_OBJECT (pad, "our template %" GST_PTR_FORMAT, templ);
708 temp = gst_caps_intersect_full (filter, templ, GST_CAPS_INTERSECT_FIRST);
709 GST_DEBUG_OBJECT (pad, "intersected %" GST_PTR_FORMAT, temp);
711 /* then see what we can transform this to */
712 peerfilter = gst_base_transform_transform_caps (trans,
713 GST_PAD_DIRECTION (pad), temp, NULL);
714 GST_DEBUG_OBJECT (pad, "transformed %" GST_PTR_FORMAT, peerfilter);
715 gst_caps_unref (temp);
717 if (!gst_caps_is_empty (peerfilter)) {
718 /* and filter against the template of the other pad */
719 GST_DEBUG_OBJECT (pad, "our template %" GST_PTR_FORMAT, otempl);
720 /* We keep the caps sorted like the returned caps */
722 gst_caps_intersect_full (peerfilter, otempl,
723 GST_CAPS_INTERSECT_FIRST);
724 GST_DEBUG_OBJECT (pad, "intersected %" GST_PTR_FORMAT, temp);
725 gst_caps_unref (peerfilter);
730 GST_DEBUG_OBJECT (pad, "peer filter caps %" GST_PTR_FORMAT, peerfilter);
732 if (peerfilter && gst_caps_is_empty (peerfilter)) {
733 GST_DEBUG_OBJECT (pad, "peer filter caps are empty");
739 /* query the peer with the transformed filter */
740 peercaps = gst_pad_peer_query_caps (otherpad, peerfilter);
743 gst_caps_unref (peerfilter);
746 GST_DEBUG_OBJECT (pad, "peer caps %" GST_PTR_FORMAT, peercaps);
748 /* filtered against our padtemplate on the other side */
749 GST_DEBUG_OBJECT (pad, "our template %" GST_PTR_FORMAT, otempl);
750 temp = gst_caps_intersect_full (peercaps, otempl, GST_CAPS_INTERSECT_FIRST);
751 GST_DEBUG_OBJECT (pad, "intersected %" GST_PTR_FORMAT, temp);
753 temp = gst_caps_ref (otempl);
756 /* then see what we can transform this to */
757 caps = gst_base_transform_transform_caps (trans,
758 GST_PAD_DIRECTION (otherpad), temp, filter);
759 GST_DEBUG_OBJECT (pad, "transformed %" GST_PTR_FORMAT, caps);
760 gst_caps_unref (temp);
761 if (caps == NULL || gst_caps_is_empty (caps))
765 /* and filter against the template of this pad */
766 GST_DEBUG_OBJECT (pad, "our template %" GST_PTR_FORMAT, templ);
767 /* We keep the caps sorted like the returned caps */
768 temp = gst_caps_intersect_full (caps, templ, GST_CAPS_INTERSECT_FIRST);
769 GST_DEBUG_OBJECT (pad, "intersected %" GST_PTR_FORMAT, temp);
770 gst_caps_unref (caps);
773 if (trans->priv->prefer_passthrough) {
774 /* Now try if we can put the untransformed downstream caps first */
775 temp = gst_caps_intersect_full (peercaps, caps, GST_CAPS_INTERSECT_FIRST);
776 if (!gst_caps_is_empty (temp)) {
777 caps = gst_caps_merge (temp, caps);
779 gst_caps_unref (temp);
783 gst_caps_unref (caps);
784 /* no peer or the peer can do anything, our padtemplate is enough then */
786 caps = gst_caps_intersect_full (filter, templ, GST_CAPS_INTERSECT_FIRST);
788 caps = gst_caps_ref (templ);
793 GST_DEBUG_OBJECT (trans, "returning %" GST_PTR_FORMAT, caps);
796 gst_caps_unref (peercaps);
798 gst_caps_unref (templ);
799 gst_caps_unref (otempl);
804 /* takes ownership of the pool, allocator and query */
806 gst_base_transform_set_allocation (GstBaseTransform * trans,
807 GstBufferPool * pool, GstAllocator * allocator,
808 GstAllocationParams * params, GstQuery * query)
810 GstAllocator *oldalloc;
811 GstBufferPool *oldpool;
813 GstBaseTransformPrivate *priv = trans->priv;
815 GST_OBJECT_LOCK (trans);
816 oldpool = priv->pool;
818 priv->pool_active = FALSE;
820 oldalloc = priv->allocator;
821 priv->allocator = allocator;
823 oldquery = priv->query;
827 priv->params = *params;
829 gst_allocation_params_init (&priv->params);
830 GST_OBJECT_UNLOCK (trans);
833 GST_DEBUG_OBJECT (trans, "deactivating old pool %p", oldpool);
834 gst_buffer_pool_set_active (oldpool, FALSE);
835 gst_object_unref (oldpool);
838 gst_object_unref (oldalloc);
841 gst_query_unref (oldquery);
847 gst_base_transform_default_decide_allocation (GstBaseTransform * trans,
851 GstBaseTransformClass *klass;
854 guint size, min, max;
855 GstAllocator *allocator;
856 GstAllocationParams params;
857 GstStructure *config;
858 gboolean update_allocator;
860 klass = GST_BASE_TRANSFORM_GET_CLASS (trans);
862 n_metas = gst_query_get_n_allocation_metas (query);
863 for (i = 0; i < n_metas; i++) {
865 const GstStructure *params;
868 api = gst_query_parse_nth_allocation_meta (query, i, ¶ms);
870 /* by default we remove all metadata, subclasses should implement a
871 * filter_meta function */
872 if (gst_meta_api_type_has_tag (api, _gst_meta_tag_memory)) {
873 /* remove all memory dependent metadata because we are going to have to
874 * allocate different memory for input and output. */
875 GST_LOG_OBJECT (trans, "removing memory specific metadata %s",
878 } else if (G_LIKELY (klass->filter_meta)) {
879 /* remove if the subclass said so */
880 remove = !klass->filter_meta (trans, query, api, params);
881 GST_LOG_OBJECT (trans, "filter_meta for api %s returned: %s",
882 g_type_name (api), (remove ? "remove" : "keep"));
884 GST_LOG_OBJECT (trans, "removing metadata %s", g_type_name (api));
889 gst_query_remove_nth_allocation_meta (query, i);
895 gst_query_parse_allocation (query, &outcaps, NULL);
897 /* we got configuration from our peer or the decide_allocation method,
899 if (gst_query_get_n_allocation_params (query) > 0) {
900 /* try the allocator */
901 gst_query_parse_nth_allocation_param (query, 0, &allocator, ¶ms);
902 update_allocator = TRUE;
905 gst_allocation_params_init (¶ms);
906 update_allocator = FALSE;
909 if (gst_query_get_n_allocation_pools (query) > 0) {
910 gst_query_parse_nth_allocation_pool (query, 0, &pool, &size, &min, &max);
913 /* no pool, we can make our own */
914 GST_DEBUG_OBJECT (trans, "no pool, making new pool");
915 pool = gst_buffer_pool_new ();
919 size = min = max = 0;
924 config = gst_buffer_pool_get_config (pool);
925 gst_buffer_pool_config_set_params (config, outcaps, size, min, max);
926 gst_buffer_pool_config_set_allocator (config, allocator, ¶ms);
928 /* buffer pool may have to do some changes */
929 if (!gst_buffer_pool_set_config (pool, config)) {
930 config = gst_buffer_pool_get_config (pool);
932 /* If change are not acceptable, fallback to generic pool */
933 if (!gst_buffer_pool_config_validate_params (config, outcaps, size, min,
935 GST_DEBUG_OBJECT (trans, "unsuported pool, making new pool");
937 gst_object_unref (pool);
938 pool = gst_buffer_pool_new ();
939 gst_buffer_pool_config_set_params (config, outcaps, size, min, max);
940 gst_buffer_pool_config_set_allocator (config, allocator, ¶ms);
943 if (!gst_buffer_pool_set_config (pool, config))
948 if (update_allocator)
949 gst_query_set_nth_allocation_param (query, 0, allocator, ¶ms);
951 gst_query_add_allocation_param (query, allocator, ¶ms);
953 gst_object_unref (allocator);
956 gst_query_set_nth_allocation_pool (query, 0, pool, size, min, max);
957 gst_object_unref (pool);
963 GST_ELEMENT_ERROR (trans, RESOURCE, SETTINGS,
964 ("Failed to configure the buffer pool"),
965 ("Configuration is most likely invalid, please report this issue."));
970 gst_base_transform_do_bufferpool (GstBaseTransform * trans, GstCaps * outcaps)
973 gboolean result = TRUE;
974 GstBufferPool *pool = NULL;
975 GstBaseTransformClass *klass;
976 GstBaseTransformPrivate *priv = trans->priv;
977 GstAllocator *allocator;
978 GstAllocationParams params;
980 /* there are these possibilities:
982 * 1) we negotiated passthrough, we can proxy the bufferpool directly and we
983 * will do that whenever some upstream does an allocation query.
984 * 2) we need to do a transform, we need to get a bufferpool from downstream
985 * and configure it. When upstream does the ALLOCATION query, the
986 * propose_allocation vmethod will be called and we will configure the
987 * upstream allocator with our proposed values then.
989 if (priv->passthrough || priv->always_in_place) {
990 /* we are in passthrough, the input buffer is never copied and always passed
991 * along. We never allocate an output buffer on the srcpad. What we do is
992 * let the upstream element decide if it wants to use a bufferpool and
993 * then we will proxy the downstream pool */
994 GST_DEBUG_OBJECT (trans, "we're passthough, delay bufferpool");
995 gst_base_transform_set_allocation (trans, NULL, NULL, NULL, NULL);
999 /* not passthrough, we need to allocate */
1000 /* find a pool for the negotiated caps now */
1001 GST_DEBUG_OBJECT (trans, "doing allocation query");
1002 query = gst_query_new_allocation (outcaps, TRUE);
1003 if (!gst_pad_peer_query (trans->srcpad, query)) {
1004 /* not a problem, just debug a little */
1005 GST_DEBUG_OBJECT (trans, "peer ALLOCATION query failed");
1008 klass = GST_BASE_TRANSFORM_GET_CLASS (trans);
1010 GST_DEBUG_OBJECT (trans, "calling decide_allocation");
1011 g_assert (klass->decide_allocation != NULL);
1012 result = klass->decide_allocation (trans, query);
1014 GST_DEBUG_OBJECT (trans, "ALLOCATION (%d) params: %" GST_PTR_FORMAT, result,
1018 goto no_decide_allocation;
1020 /* we got configuration from our peer or the decide_allocation method,
1022 if (gst_query_get_n_allocation_params (query) > 0) {
1023 gst_query_parse_nth_allocation_param (query, 0, &allocator, ¶ms);
1026 gst_allocation_params_init (¶ms);
1029 if (gst_query_get_n_allocation_pools (query) > 0)
1030 gst_query_parse_nth_allocation_pool (query, 0, &pool, NULL, NULL, NULL);
1034 gst_base_transform_set_allocation (trans, pool, allocator, ¶ms,
1040 no_decide_allocation:
1042 GST_WARNING_OBJECT (trans, "Subclass failed to decide allocation");
1043 gst_query_unref (query);
1049 /* function triggered when the in and out caps are negotiated and need
1050 * to be configured in the subclass. */
1052 gst_base_transform_configure_caps (GstBaseTransform * trans, GstCaps * in,
1055 gboolean ret = TRUE;
1056 GstBaseTransformClass *klass;
1057 GstBaseTransformPrivate *priv = trans->priv;
1059 klass = GST_BASE_TRANSFORM_GET_CLASS (trans);
1061 GST_DEBUG_OBJECT (trans, "in caps: %" GST_PTR_FORMAT, in);
1062 GST_DEBUG_OBJECT (trans, "out caps: %" GST_PTR_FORMAT, out);
1064 /* clear the cache */
1065 gst_caps_replace (&priv->cache_caps1, NULL);
1066 gst_caps_replace (&priv->cache_caps2, NULL);
1068 /* figure out same caps state */
1069 priv->have_same_caps = gst_caps_is_equal (in, out);
1070 GST_DEBUG_OBJECT (trans, "have_same_caps: %d", priv->have_same_caps);
1072 /* Set the passthrough if the class wants passthrough_on_same_caps
1073 * and we have the same caps on each pad */
1074 if (klass->passthrough_on_same_caps)
1075 gst_base_transform_set_passthrough (trans, priv->have_same_caps);
1077 /* now configure the element with the caps */
1078 if (klass->set_caps) {
1079 GST_DEBUG_OBJECT (trans, "Calling set_caps method to setup caps");
1080 ret = klass->set_caps (trans, in, out);
1087 gst_base_transform_default_fixate_caps (GstBaseTransform * trans,
1088 GstPadDirection direction, GstCaps * caps, GstCaps * othercaps)
1090 othercaps = gst_caps_fixate (othercaps);
1091 GST_DEBUG_OBJECT (trans, "fixated to %" GST_PTR_FORMAT, othercaps);
1096 /* given a fixed @caps on @pad, create the best possible caps for the
1098 * @caps must be fixed when calling this function.
1100 * This function calls the transform caps vmethod of the basetransform to figure
1101 * out the possible target formats. It then tries to select the best format from
1104 * - attempt passthrough if the target caps is a superset of the input caps
1105 * - fixating by using peer caps
1106 * - fixating with transform fixate function
1107 * - fixating with pad fixate functions.
1109 * this function returns a caps that can be transformed into and is accepted by
1113 gst_base_transform_find_transform (GstBaseTransform * trans, GstPad * pad,
1116 GstBaseTransformClass *klass;
1117 GstPad *otherpad, *otherpeer;
1121 /* caps must be fixed here, this is a programming error if it's not */
1122 g_return_val_if_fail (gst_caps_is_fixed (caps), NULL);
1124 klass = GST_BASE_TRANSFORM_GET_CLASS (trans);
1126 otherpad = (pad == trans->srcpad) ? trans->sinkpad : trans->srcpad;
1127 otherpeer = gst_pad_get_peer (otherpad);
1129 /* see how we can transform the input caps. We need to do this even for
1130 * passthrough because it might be possible that this element cannot support
1131 * passthrough at all. */
1132 othercaps = gst_base_transform_transform_caps (trans,
1133 GST_PAD_DIRECTION (pad), caps, NULL);
1135 /* The caps we can actually output is the intersection of the transformed
1136 * caps with the pad template for the pad */
1137 if (othercaps && !gst_caps_is_empty (othercaps)) {
1138 GstCaps *intersect, *templ_caps;
1140 templ_caps = gst_pad_get_pad_template_caps (otherpad);
1141 GST_DEBUG_OBJECT (trans,
1142 "intersecting against padtemplate %" GST_PTR_FORMAT, templ_caps);
1145 gst_caps_intersect_full (othercaps, templ_caps,
1146 GST_CAPS_INTERSECT_FIRST);
1148 gst_caps_unref (othercaps);
1149 gst_caps_unref (templ_caps);
1150 othercaps = intersect;
1153 /* check if transform is empty */
1154 if (!othercaps || gst_caps_is_empty (othercaps))
1157 /* if the othercaps are not fixed, we need to fixate them, first attempt
1158 * is by attempting passthrough if the othercaps are a superset of caps. */
1159 /* FIXME. maybe the caps is not fixed because it has multiple structures of
1161 is_fixed = gst_caps_is_fixed (othercaps);
1163 GST_DEBUG_OBJECT (trans,
1164 "transform returned non fixed %" GST_PTR_FORMAT, othercaps);
1166 /* Now let's see what the peer suggests based on our transformed caps */
1168 GstCaps *peercaps, *intersection, *templ_caps;
1170 GST_DEBUG_OBJECT (trans,
1171 "Checking peer caps with filter %" GST_PTR_FORMAT, othercaps);
1173 peercaps = gst_pad_query_caps (otherpeer, othercaps);
1174 GST_DEBUG_OBJECT (trans, "Resulted in %" GST_PTR_FORMAT, peercaps);
1175 if (!gst_caps_is_empty (peercaps)) {
1176 templ_caps = gst_pad_get_pad_template_caps (otherpad);
1178 GST_DEBUG_OBJECT (trans,
1179 "Intersecting with template caps %" GST_PTR_FORMAT, templ_caps);
1182 gst_caps_intersect_full (peercaps, templ_caps,
1183 GST_CAPS_INTERSECT_FIRST);
1184 GST_DEBUG_OBJECT (trans, "Intersection: %" GST_PTR_FORMAT,
1186 gst_caps_unref (peercaps);
1187 gst_caps_unref (templ_caps);
1188 peercaps = intersection;
1190 GST_DEBUG_OBJECT (trans,
1191 "Intersecting with transformed caps %" GST_PTR_FORMAT, othercaps);
1193 gst_caps_intersect_full (peercaps, othercaps,
1194 GST_CAPS_INTERSECT_FIRST);
1195 GST_DEBUG_OBJECT (trans, "Intersection: %" GST_PTR_FORMAT,
1197 gst_caps_unref (peercaps);
1198 gst_caps_unref (othercaps);
1199 othercaps = intersection;
1201 gst_caps_unref (othercaps);
1202 othercaps = peercaps;
1205 is_fixed = gst_caps_is_fixed (othercaps);
1207 GST_DEBUG_OBJECT (trans, "no peer, doing passthrough");
1208 gst_caps_unref (othercaps);
1209 othercaps = gst_caps_ref (caps);
1213 if (gst_caps_is_empty (othercaps))
1214 goto no_transform_possible;
1216 GST_DEBUG ("have %sfixed caps %" GST_PTR_FORMAT, (is_fixed ? "" : "non-"),
1219 /* second attempt at fixation, call the fixate vmethod */
1220 /* caps could be fixed but the subclass may want to add fields */
1221 if (klass->fixate_caps) {
1222 GST_DEBUG_OBJECT (trans, "calling fixate_caps for %" GST_PTR_FORMAT
1223 " using caps %" GST_PTR_FORMAT " on pad %s:%s", othercaps, caps,
1224 GST_DEBUG_PAD_NAME (otherpad));
1225 /* note that we pass the complete array of structures to the fixate
1226 * function, it needs to truncate itself */
1228 klass->fixate_caps (trans, GST_PAD_DIRECTION (pad), caps, othercaps);
1229 is_fixed = gst_caps_is_fixed (othercaps);
1230 GST_DEBUG_OBJECT (trans, "after fixating %" GST_PTR_FORMAT, othercaps);
1233 /* caps should be fixed now, if not we have to fail. */
1235 goto could_not_fixate;
1237 /* and peer should accept */
1238 if (otherpeer && !gst_pad_query_accept_caps (otherpeer, othercaps))
1239 goto peer_no_accept;
1241 GST_DEBUG_OBJECT (trans, "Input caps were %" GST_PTR_FORMAT
1242 ", and got final caps %" GST_PTR_FORMAT, caps, othercaps);
1245 gst_object_unref (otherpeer);
1252 GST_DEBUG_OBJECT (trans,
1253 "transform returned useless %" GST_PTR_FORMAT, othercaps);
1256 no_transform_possible:
1258 GST_DEBUG_OBJECT (trans,
1259 "transform could not transform %" GST_PTR_FORMAT
1260 " in anything we support", caps);
1265 GST_DEBUG_OBJECT (trans, "FAILED to fixate %" GST_PTR_FORMAT, othercaps);
1270 GST_DEBUG_OBJECT (trans, "FAILED to get peer of %" GST_PTR_FORMAT
1271 " to accept %" GST_PTR_FORMAT, otherpad, othercaps);
1277 gst_object_unref (otherpeer);
1279 gst_caps_unref (othercaps);
1285 gst_base_transform_acceptcaps_default (GstBaseTransform * trans,
1286 GstPadDirection direction, GstCaps * caps)
1290 GstCaps *othercaps = NULL;
1292 gboolean ret = TRUE;
1295 otherpad = (pad == trans->srcpad) ? trans->sinkpad : trans->srcpad;
1297 /* we need fixed caps for the check, fall back to the default implementation
1299 if (!gst_caps_is_fixed (caps))
1304 GST_DEBUG_OBJECT (trans, "accept caps %" GST_PTR_FORMAT, caps);
1306 /* get all the formats we can handle on this pad */
1307 if (direction == GST_PAD_SRC)
1308 allowed = gst_pad_query_caps (trans->srcpad, caps);
1310 allowed = gst_pad_query_caps (trans->sinkpad, caps);
1313 GST_DEBUG_OBJECT (trans, "gst_pad_query_caps() failed");
1314 goto no_transform_possible;
1317 GST_DEBUG_OBJECT (trans, "allowed caps %" GST_PTR_FORMAT, allowed);
1319 /* intersect with the requested format */
1320 ret = gst_caps_is_subset (caps, allowed);
1321 gst_caps_unref (allowed);
1324 goto no_transform_possible;
1328 GST_DEBUG_OBJECT (pad, "accept caps %" GST_PTR_FORMAT, caps);
1330 /* find best possible caps for the other pad as a way to see if we can
1331 * transform this caps. */
1332 othercaps = gst_base_transform_find_transform (trans, pad, caps, FALSE);
1333 if (!othercaps || gst_caps_is_empty (othercaps))
1334 goto no_transform_possible;
1336 GST_DEBUG_OBJECT (pad, "we can transform to %" GST_PTR_FORMAT, othercaps);
1342 /* We know it's always NULL since we never use it */
1344 gst_caps_unref (othercaps);
1350 no_transform_possible:
1352 GST_DEBUG_OBJECT (trans,
1353 "transform could not transform %" GST_PTR_FORMAT
1354 " in anything we support", caps);
1360 /* called when new caps arrive on the sink pad,
1361 * We try to find the best caps for the other side using our _find_transform()
1362 * function. If there are caps, we configure the transform for this new
1366 gst_base_transform_setcaps (GstBaseTransform * trans, GstPad * pad,
1369 GstBaseTransformPrivate *priv = trans->priv;
1370 GstCaps *outcaps, *prev_incaps = NULL, *prev_outcaps = NULL;
1371 gboolean ret = TRUE;
1373 GST_DEBUG_OBJECT (pad, "have new caps %p %" GST_PTR_FORMAT, incaps, incaps);
1375 /* find best possible caps for the other pad */
1376 outcaps = gst_base_transform_find_transform (trans, pad, incaps);
1377 if (!outcaps || gst_caps_is_empty (outcaps))
1378 goto no_transform_possible;
1380 /* configure the element now */
1382 /* if we have the same caps, we can optimize and reuse the input caps */
1383 if (gst_caps_is_equal (incaps, outcaps)) {
1384 GST_INFO_OBJECT (trans, "reuse caps");
1385 gst_caps_unref (outcaps);
1386 outcaps = gst_caps_ref (incaps);
1389 prev_incaps = gst_pad_get_current_caps (trans->sinkpad);
1390 prev_outcaps = gst_pad_get_current_caps (trans->srcpad);
1391 if (prev_incaps && prev_outcaps && gst_caps_is_equal (prev_incaps, incaps)
1392 && gst_caps_is_equal (prev_outcaps, outcaps)) {
1393 GST_DEBUG_OBJECT (trans,
1394 "New caps equal to old ones: %" GST_PTR_FORMAT " -> %" GST_PTR_FORMAT,
1398 /* call configure now */
1399 if (!(ret = gst_base_transform_configure_caps (trans, incaps, outcaps)))
1400 goto failed_configure;
1402 if (!prev_outcaps || !gst_caps_is_equal (outcaps, prev_outcaps))
1403 /* let downstream know about our caps */
1404 ret = gst_pad_set_caps (trans->srcpad, outcaps);
1408 /* try to get a pool when needed */
1409 ret = gst_base_transform_do_bufferpool (trans, outcaps);
1414 gst_caps_unref (outcaps);
1416 gst_caps_unref (prev_incaps);
1418 gst_caps_unref (prev_outcaps);
1420 GST_OBJECT_LOCK (trans);
1421 priv->negotiated = ret;
1422 GST_OBJECT_UNLOCK (trans);
1427 no_transform_possible:
1429 GST_WARNING_OBJECT (trans,
1430 "transform could not transform %" GST_PTR_FORMAT
1431 " in anything we support", incaps);
1437 GST_WARNING_OBJECT (trans, "FAILED to configure incaps %" GST_PTR_FORMAT
1438 " and outcaps %" GST_PTR_FORMAT, incaps, outcaps);
1445 gst_base_transform_default_propose_allocation (GstBaseTransform * trans,
1446 GstQuery * decide_query, GstQuery * query)
1450 if (decide_query == NULL) {
1451 GST_DEBUG_OBJECT (trans, "doing passthrough query");
1452 ret = gst_pad_peer_query (trans->srcpad, query);
1455 /* non-passthrough, copy all metadata, decide_query does not contain the
1456 * metadata anymore that depends on the buffer memory */
1457 n_metas = gst_query_get_n_allocation_metas (decide_query);
1458 for (i = 0; i < n_metas; i++) {
1460 const GstStructure *params;
1462 api = gst_query_parse_nth_allocation_meta (decide_query, i, ¶ms);
1463 GST_DEBUG_OBJECT (trans, "proposing metadata %s", g_type_name (api));
1464 gst_query_add_allocation_meta (query, api, params);
1472 gst_base_transform_default_query (GstBaseTransform * trans,
1473 GstPadDirection direction, GstQuery * query)
1475 gboolean ret = FALSE;
1476 GstPad *pad, *otherpad;
1477 GstBaseTransformClass *klass;
1478 GstBaseTransformPrivate *priv = trans->priv;
1480 if (direction == GST_PAD_SRC) {
1481 pad = trans->srcpad;
1482 otherpad = trans->sinkpad;
1484 pad = trans->sinkpad;
1485 otherpad = trans->srcpad;
1488 klass = GST_BASE_TRANSFORM_GET_CLASS (trans);
1490 switch (GST_QUERY_TYPE (query)) {
1491 case GST_QUERY_ALLOCATION:
1493 GstQuery *decide_query = NULL;
1495 /* can only be done on the sinkpad */
1496 if (direction != GST_PAD_SINK)
1499 GST_OBJECT_LOCK (trans);
1500 if (!priv->negotiated && !priv->passthrough && (klass->set_caps != NULL)) {
1501 GST_DEBUG_OBJECT (trans,
1502 "not negotiated yet but need negotiation, can't answer ALLOCATION query");
1503 GST_OBJECT_UNLOCK (trans);
1507 decide_query = trans->priv->query;
1508 trans->priv->query = NULL;
1510 GST_OBJECT_UNLOCK (trans);
1512 GST_DEBUG_OBJECT (trans,
1513 "calling propose allocation with query %" GST_PTR_FORMAT,
1516 /* pass the query to the propose_allocation vmethod if any */
1517 if (G_LIKELY (klass->propose_allocation))
1518 ret = klass->propose_allocation (trans, decide_query, query);
1523 GST_OBJECT_LOCK (trans);
1525 if (trans->priv->query == NULL)
1526 trans->priv->query = decide_query;
1528 gst_query_unref (decide_query);
1530 GST_OBJECT_UNLOCK (trans);
1533 GST_DEBUG_OBJECT (trans, "ALLOCATION ret %d, %" GST_PTR_FORMAT, ret,
1537 case GST_QUERY_POSITION:
1541 gst_query_parse_position (query, &format, NULL);
1542 if (format == GST_FORMAT_TIME && trans->segment.format == GST_FORMAT_TIME) {
1546 if ((direction == GST_PAD_SINK)
1547 || (trans->priv->position_out == GST_CLOCK_TIME_NONE)) {
1549 gst_segment_to_stream_time (&trans->segment, GST_FORMAT_TIME,
1550 trans->segment.position);
1552 pos = gst_segment_to_stream_time (&trans->segment, GST_FORMAT_TIME,
1553 trans->priv->position_out);
1555 gst_query_set_position (query, format, pos);
1557 ret = gst_pad_peer_query (otherpad, query);
1561 case GST_QUERY_ACCEPT_CAPS:
1565 gst_query_parse_accept_caps (query, &caps);
1566 if (klass->accept_caps) {
1567 ret = klass->accept_caps (trans, direction, caps);
1568 gst_query_set_accept_caps_result (query, ret);
1569 /* return TRUE, we answered the query */
1574 case GST_QUERY_CAPS:
1576 GstCaps *filter, *caps;
1578 gst_query_parse_caps (query, &filter);
1579 caps = gst_base_transform_query_caps (trans, pad, filter);
1580 gst_query_set_caps_result (query, caps);
1581 gst_caps_unref (caps);
1586 ret = gst_pad_peer_query (otherpad, query);
1595 gst_base_transform_query (GstPad * pad, GstObject * parent, GstQuery * query)
1597 GstBaseTransform *trans;
1598 GstBaseTransformClass *bclass;
1599 gboolean ret = FALSE;
1601 trans = GST_BASE_TRANSFORM (parent);
1602 bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
1605 ret = bclass->query (trans, GST_PAD_DIRECTION (pad), query);
1610 /* this function either returns the input buffer without incrementing the
1611 * refcount or it allocates a new (writable) buffer */
1612 static GstFlowReturn
1613 default_prepare_output_buffer (GstBaseTransform * trans,
1614 GstBuffer * inbuf, GstBuffer ** outbuf)
1616 GstBaseTransformPrivate *priv;
1618 GstBaseTransformClass *bclass;
1619 GstCaps *incaps, *outcaps;
1620 gsize insize, outsize;
1624 bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
1626 /* figure out how to allocate an output buffer */
1627 if (priv->passthrough) {
1628 /* passthrough, we will not modify the incoming buffer so we can just
1630 GST_DEBUG_OBJECT (trans, "passthrough: reusing input buffer");
1635 /* we can't reuse the input buffer */
1637 if (!priv->pool_active) {
1638 GST_DEBUG_OBJECT (trans, "setting pool %p active", priv->pool);
1639 if (!gst_buffer_pool_set_active (priv->pool, TRUE))
1640 goto activate_failed;
1641 priv->pool_active = TRUE;
1643 GST_DEBUG_OBJECT (trans, "using pool alloc");
1644 ret = gst_buffer_pool_acquire_buffer (priv->pool, outbuf, NULL);
1645 if (ret != GST_FLOW_OK)
1651 /* no pool, we need to figure out the size of the output buffer first */
1652 if ((bclass->transform_ip != NULL) && priv->always_in_place) {
1653 /* we want to do an in-place alloc */
1654 if (gst_buffer_is_writable (inbuf)) {
1655 GST_DEBUG_OBJECT (trans, "inplace reuse writable input buffer");
1658 GST_DEBUG_OBJECT (trans, "making writable buffer copy");
1659 /* we make a copy of the input buffer */
1660 *outbuf = gst_buffer_copy (inbuf);
1665 /* else use the transform function to get the size */
1666 incaps = gst_pad_get_current_caps (trans->sinkpad);
1667 outcaps = gst_pad_get_current_caps (trans->srcpad);
1669 /* srcpad might be flushing already if we're being shut down */
1670 if (outcaps == NULL)
1673 GST_DEBUG_OBJECT (trans, "getting output size for alloc");
1674 /* copy transform, figure out the output size */
1675 insize = gst_buffer_get_size (inbuf);
1676 res = gst_base_transform_transform_size (trans,
1677 GST_PAD_SINK, incaps, insize, outcaps, &outsize);
1679 gst_caps_unref (incaps);
1680 gst_caps_unref (outcaps);
1685 GST_DEBUG_OBJECT (trans, "doing alloc of size %" G_GSIZE_FORMAT, outsize);
1686 *outbuf = gst_buffer_new_allocate (priv->allocator, outsize, &priv->params);
1688 ret = GST_FLOW_ERROR;
1693 /* copy the metadata */
1694 if (bclass->copy_metadata)
1695 if (!bclass->copy_metadata (trans, inbuf, *outbuf)) {
1696 /* something failed, post a warning */
1697 GST_ELEMENT_WARNING (trans, STREAM, NOT_IMPLEMENTED,
1698 ("could not copy metadata"), (NULL));
1707 GST_ELEMENT_ERROR (trans, RESOURCE, SETTINGS,
1708 ("failed to activate bufferpool"), ("failed to activate bufferpool"));
1709 return GST_FLOW_ERROR;
1713 GST_ERROR_OBJECT (trans, "unknown output size");
1714 return GST_FLOW_ERROR;
1718 GST_DEBUG_OBJECT (trans, "could not allocate buffer from pool");
1723 GST_DEBUG_OBJECT (trans, "no output caps, source pad has been deactivated");
1724 gst_caps_unref (incaps);
1725 return GST_FLOW_FLUSHING;
1731 GstBaseTransform *trans;
1736 foreach_metadata (GstBuffer * inbuf, GstMeta ** meta, gpointer user_data)
1738 CopyMetaData *data = user_data;
1739 GstBaseTransform *trans = data->trans;
1740 GstBaseTransformClass *klass;
1741 const GstMetaInfo *info = (*meta)->info;
1742 GstBuffer *outbuf = data->outbuf;
1743 gboolean do_copy = FALSE;
1745 klass = GST_BASE_TRANSFORM_GET_CLASS (trans);
1747 if (gst_meta_api_type_has_tag (info->api, _gst_meta_tag_memory)) {
1748 /* never call the transform_meta with memory specific metadata */
1749 GST_DEBUG_OBJECT (trans, "not copying memory specific metadata %s",
1750 g_type_name (info->api));
1752 } else if (klass->transform_meta) {
1753 do_copy = klass->transform_meta (trans, outbuf, *meta, inbuf);
1754 GST_DEBUG_OBJECT (trans, "transformed metadata %s: copy: %d",
1755 g_type_name (info->api), do_copy);
1758 /* we only copy metadata when the subclass implemented a transform_meta
1759 * function and when it returns %TRUE */
1761 GstMetaTransformCopy copy_data = { FALSE, 0, -1 };
1762 GST_DEBUG_OBJECT (trans, "copy metadata %s", g_type_name (info->api));
1763 /* simply copy then */
1764 info->transform_func (outbuf, *meta, inbuf,
1765 _gst_meta_transform_copy, ©_data);
1771 default_copy_metadata (GstBaseTransform * trans,
1772 GstBuffer * inbuf, GstBuffer * outbuf)
1774 GstBaseTransformPrivate *priv = trans->priv;
1777 /* now copy the metadata */
1778 GST_DEBUG_OBJECT (trans, "copying metadata");
1780 /* this should not happen, buffers allocated from a pool or with
1781 * new_allocate should always be writable. */
1782 if (!gst_buffer_is_writable (outbuf))
1785 /* when we get here, the metadata should be writable */
1786 gst_buffer_copy_into (outbuf, inbuf,
1787 GST_BUFFER_COPY_FLAGS | GST_BUFFER_COPY_TIMESTAMPS, 0, -1);
1789 /* clear the GAP flag when the subclass does not understand it */
1790 if (!priv->gap_aware)
1791 GST_BUFFER_FLAG_UNSET (outbuf, GST_BUFFER_FLAG_GAP);
1795 data.outbuf = outbuf;
1797 gst_buffer_foreach_meta (inbuf, foreach_metadata, &data);
1804 GST_WARNING_OBJECT (trans, "buffer %p not writable", outbuf);
1809 /* Given @caps calcultate the size of one unit.
1811 * For video caps, this is the size of one frame (and thus one buffer).
1812 * For audio caps, this is the size of one sample.
1814 * These values are cached since they do not change and the calculation
1815 * potentially involves parsing caps and other expensive stuff.
1817 * We have two cache locations to store the size, one for the source caps
1818 * and one for the sink caps.
1820 * this function returns %FALSE if no size could be calculated.
1823 gst_base_transform_get_unit_size (GstBaseTransform * trans, GstCaps * caps,
1826 gboolean res = FALSE;
1827 GstBaseTransformClass *bclass;
1828 GstBaseTransformPrivate *priv = trans->priv;
1830 /* see if we have the result cached */
1831 if (priv->cache_caps1 == caps) {
1832 *size = priv->cache_caps1_size;
1833 GST_DEBUG_OBJECT (trans,
1834 "returned %" G_GSIZE_FORMAT " from first cache", *size);
1837 if (priv->cache_caps2 == caps) {
1838 *size = priv->cache_caps2_size;
1839 GST_DEBUG_OBJECT (trans,
1840 "returned %" G_GSIZE_FORMAT " from second cached", *size);
1844 bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
1845 res = bclass->get_unit_size (trans, caps, size);
1846 GST_DEBUG_OBJECT (trans,
1847 "caps %" GST_PTR_FORMAT ") has unit size %" G_GSIZE_FORMAT ", res %s",
1848 caps, *size, res ? "TRUE" : "FALSE");
1851 /* and cache the values */
1852 if (priv->cache_caps1 == NULL) {
1853 gst_caps_replace (&priv->cache_caps1, caps);
1854 priv->cache_caps1_size = *size;
1855 GST_DEBUG_OBJECT (trans,
1856 "caching %" G_GSIZE_FORMAT " in first cache", *size);
1857 } else if (priv->cache_caps2 == NULL) {
1858 gst_caps_replace (&priv->cache_caps2, caps);
1859 priv->cache_caps2_size = *size;
1860 GST_DEBUG_OBJECT (trans,
1861 "caching %" G_GSIZE_FORMAT " in second cache", *size);
1863 GST_DEBUG_OBJECT (trans, "no free spot to cache unit_size");
1870 gst_base_transform_sink_event (GstPad * pad, GstObject * parent,
1873 GstBaseTransform *trans;
1874 GstBaseTransformClass *bclass;
1875 gboolean ret = TRUE;
1877 trans = GST_BASE_TRANSFORM (parent);
1878 bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
1880 if (bclass->sink_event)
1881 ret = bclass->sink_event (trans, event);
1883 gst_event_unref (event);
1889 gst_base_transform_sink_eventfunc (GstBaseTransform * trans, GstEvent * event)
1891 gboolean ret = TRUE, forward = TRUE;
1892 GstBaseTransformPrivate *priv = trans->priv;
1894 switch (GST_EVENT_TYPE (event)) {
1895 case GST_EVENT_FLUSH_START:
1897 case GST_EVENT_FLUSH_STOP:
1898 GST_OBJECT_LOCK (trans);
1899 /* reset QoS parameters */
1900 priv->proportion = 1.0;
1901 priv->earliest_time = -1;
1902 priv->discont = FALSE;
1903 priv->processed = 0;
1905 GST_OBJECT_UNLOCK (trans);
1906 /* we need new segment info after the flush. */
1907 trans->have_segment = FALSE;
1908 gst_segment_init (&trans->segment, GST_FORMAT_UNDEFINED);
1909 priv->position_out = GST_CLOCK_TIME_NONE;
1915 case GST_EVENT_CAPS:
1919 gst_event_parse_caps (event, &caps);
1920 /* clear any pending reconfigure flag */
1921 gst_pad_check_reconfigure (trans->srcpad);
1922 ret = gst_base_transform_setcaps (trans, trans->sinkpad, caps);
1927 case GST_EVENT_SEGMENT:
1929 gst_event_copy_segment (event, &trans->segment);
1930 trans->have_segment = TRUE;
1932 GST_DEBUG_OBJECT (trans, "received SEGMENT %" GST_SEGMENT_FORMAT,
1941 ret = gst_pad_push_event (trans->srcpad, event);
1943 gst_event_unref (event);
1949 gst_base_transform_src_event (GstPad * pad, GstObject * parent,
1952 GstBaseTransform *trans;
1953 GstBaseTransformClass *bclass;
1954 gboolean ret = TRUE;
1956 trans = GST_BASE_TRANSFORM (parent);
1957 bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
1959 if (bclass->src_event)
1960 ret = bclass->src_event (trans, event);
1962 gst_event_unref (event);
1968 gst_base_transform_src_eventfunc (GstBaseTransform * trans, GstEvent * event)
1972 GST_DEBUG_OBJECT (trans, "handling event %p %" GST_PTR_FORMAT, event, event);
1974 switch (GST_EVENT_TYPE (event)) {
1975 case GST_EVENT_SEEK:
1977 case GST_EVENT_NAVIGATION:
1982 GstClockTimeDiff diff;
1983 GstClockTime timestamp;
1985 gst_event_parse_qos (event, NULL, &proportion, &diff, ×tamp);
1986 gst_base_transform_update_qos (trans, proportion, diff, timestamp);
1993 ret = gst_pad_push_event (trans->sinkpad, event);
1998 /* Takes the input buffer */
1999 static GstFlowReturn
2000 default_submit_input_buffer (GstBaseTransform * trans, gboolean is_discont,
2003 GstBaseTransformClass *bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
2004 GstBaseTransformPrivate *priv = trans->priv;
2005 GstFlowReturn ret = GST_FLOW_OK;
2006 gboolean reconfigure;
2007 GstClockTime running_time;
2008 GstClockTime timestamp;
2010 reconfigure = gst_pad_check_reconfigure (trans->srcpad);
2012 if (G_UNLIKELY (reconfigure)) {
2015 GST_DEBUG_OBJECT (trans, "we had a pending reconfigure");
2017 incaps = gst_pad_get_current_caps (trans->sinkpad);
2019 goto no_reconfigure;
2021 /* if we need to reconfigure we pretend new caps arrived. This
2022 * will reconfigure the transform with the new output format. */
2023 if (!gst_base_transform_setcaps (trans, trans->sinkpad, incaps)) {
2024 gst_caps_unref (incaps);
2025 goto not_negotiated;
2027 gst_caps_unref (incaps);
2031 if (GST_BUFFER_OFFSET_IS_VALID (inbuf))
2032 GST_DEBUG_OBJECT (trans,
2033 "handling buffer %p of size %" G_GSIZE_FORMAT " and offset %"
2034 G_GUINT64_FORMAT, inbuf, gst_buffer_get_size (inbuf),
2035 GST_BUFFER_OFFSET (inbuf));
2037 GST_DEBUG_OBJECT (trans,
2038 "handling buffer %p of size %" G_GSIZE_FORMAT " and offset NONE", inbuf,
2039 gst_buffer_get_size (inbuf));
2041 /* Don't allow buffer handling before negotiation, except in passthrough mode
2042 * or if the class doesn't implement a set_caps function (in which case it doesn't
2045 if (!priv->negotiated && !priv->passthrough && (bclass->set_caps != NULL))
2046 goto not_negotiated;
2048 /* can only do QoS if the segment is in TIME */
2049 if (trans->segment.format != GST_FORMAT_TIME)
2052 /* QOS is done on the running time of the buffer, get it now */
2053 timestamp = GST_BUFFER_TIMESTAMP (inbuf);
2054 running_time = gst_segment_to_running_time (&trans->segment, GST_FORMAT_TIME,
2057 if (running_time != -1) {
2059 GstClockTime earliest_time;
2062 /* lock for getting the QoS parameters that are set (in a different thread)
2063 * with the QOS events */
2064 GST_OBJECT_LOCK (trans);
2065 earliest_time = priv->earliest_time;
2066 proportion = priv->proportion;
2067 /* check for QoS, don't perform conversion for buffers
2068 * that are known to be late. */
2069 need_skip = priv->qos_enabled &&
2070 earliest_time != -1 && running_time <= earliest_time;
2071 GST_OBJECT_UNLOCK (trans);
2074 GstMessage *qos_msg;
2075 GstClockTime duration;
2076 guint64 stream_time;
2079 GST_CAT_DEBUG_OBJECT (GST_CAT_QOS, trans, "skipping transform: qostime %"
2080 GST_TIME_FORMAT " <= %" GST_TIME_FORMAT,
2081 GST_TIME_ARGS (running_time), GST_TIME_ARGS (earliest_time));
2085 duration = GST_BUFFER_DURATION (inbuf);
2087 gst_segment_to_stream_time (&trans->segment, GST_FORMAT_TIME,
2089 jitter = GST_CLOCK_DIFF (running_time, earliest_time);
2092 gst_message_new_qos (GST_OBJECT_CAST (trans), FALSE, running_time,
2093 stream_time, timestamp, duration);
2094 gst_message_set_qos_values (qos_msg, jitter, proportion, 1000000);
2095 gst_message_set_qos_stats (qos_msg, GST_FORMAT_BUFFERS,
2096 priv->processed, priv->dropped);
2097 gst_element_post_message (GST_ELEMENT_CAST (trans), qos_msg);
2099 /* mark discont for next buffer */
2100 priv->discont = TRUE;
2101 ret = GST_BASE_TRANSFORM_FLOW_DROPPED;
2107 /* Stash input buffer where the default generate_output
2108 * function can find it */
2109 if (trans->queued_buf)
2110 gst_buffer_unref (trans->queued_buf);
2111 trans->queued_buf = inbuf;
2114 gst_buffer_unref (inbuf);
2119 gst_buffer_unref (inbuf);
2120 if (GST_PAD_IS_FLUSHING (trans->srcpad))
2121 return GST_FLOW_FLUSHING;
2122 GST_ELEMENT_WARNING (trans, STREAM, FORMAT,
2123 ("not negotiated"), ("not negotiated"));
2124 return GST_FLOW_NOT_NEGOTIATED;
2128 static GstFlowReturn
2129 default_generate_output (GstBaseTransform * trans, GstBuffer ** outbuf)
2131 GstBaseTransformClass *bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
2132 GstBaseTransformPrivate *priv = trans->priv;
2133 GstFlowReturn ret = GST_FLOW_OK;
2135 gboolean want_in_place;
2137 /* Retrieve stashed input buffer, if the default submit_input_buffer
2138 * was run. Takes ownership back from there */
2139 inbuf = trans->queued_buf;
2140 trans->queued_buf = NULL;
2142 /* This default processing method needs one input buffer to feed to
2143 * the transform functions, we can't do anything without it */
2147 /* first try to allocate an output buffer based on the currently negotiated
2148 * format. outbuf will contain a buffer suitable for doing the configured
2149 * transform after this function. */
2150 if (bclass->prepare_output_buffer == NULL)
2153 GST_DEBUG_OBJECT (trans, "calling prepare buffer");
2154 ret = bclass->prepare_output_buffer (trans, inbuf, outbuf);
2156 if (ret != GST_FLOW_OK || *outbuf == NULL)
2159 GST_DEBUG_OBJECT (trans, "using allocated buffer in %p, out %p", inbuf,
2162 /* now perform the needed transform */
2163 if (priv->passthrough) {
2164 /* In passthrough mode, give transform_ip a look at the
2165 * buffer, without making it writable, or just push the
2167 if (bclass->transform_ip_on_passthrough && bclass->transform_ip) {
2168 GST_DEBUG_OBJECT (trans, "doing passthrough transform_ip");
2169 ret = bclass->transform_ip (trans, *outbuf);
2171 GST_DEBUG_OBJECT (trans, "element is in passthrough");
2174 want_in_place = (bclass->transform_ip != NULL) && priv->always_in_place;
2176 if (want_in_place) {
2177 GST_DEBUG_OBJECT (trans, "doing inplace transform");
2178 ret = bclass->transform_ip (trans, *outbuf);
2180 GST_DEBUG_OBJECT (trans, "doing non-inplace transform");
2182 if (bclass->transform)
2183 ret = bclass->transform (trans, inbuf, *outbuf);
2185 ret = GST_FLOW_NOT_SUPPORTED;
2189 /* only unref input buffer if we allocated a new outbuf buffer. If we reused
2190 * the input buffer, no refcount is changed to keep the input buffer writable
2192 if (*outbuf != inbuf)
2193 gst_buffer_unref (inbuf);
2200 gst_buffer_unref (inbuf);
2201 GST_ELEMENT_ERROR (trans, STREAM, NOT_IMPLEMENTED,
2202 ("Sub-class has no prepare_output_buffer implementation"), (NULL));
2203 return GST_FLOW_NOT_SUPPORTED;
2207 gst_buffer_unref (inbuf);
2209 GST_WARNING_OBJECT (trans, "could not get buffer from pool: %s",
2210 gst_flow_get_name (ret));
2215 /* FIXME, getrange is broken, need to pull range from the other
2216 * end based on the transform_size result.
2218 static GstFlowReturn
2219 gst_base_transform_getrange (GstPad * pad, GstObject * parent, guint64 offset,
2220 guint length, GstBuffer ** buffer)
2222 GstBaseTransformClass *klass = GST_BASE_TRANSFORM_GET_CLASS (parent);
2223 GstBaseTransform *trans = GST_BASE_TRANSFORM (parent);
2224 GstBaseTransformPrivate *priv = trans->priv;
2226 GstBuffer *inbuf = NULL;
2227 GstBuffer *outbuf = NULL;
2229 /* Try and generate a buffer, if the sub-class wants more data,
2230 * pull some and repeat until a buffer (or error) is produced */
2232 ret = klass->generate_output (trans, &outbuf);
2234 /* Consume the DROPPED return value and go get more data */
2235 if (ret == GST_BASE_TRANSFORM_FLOW_DROPPED)
2238 if (ret != GST_FLOW_OK || outbuf != NULL)
2241 /* No buffer generated, try and pull data */
2242 ret = gst_pad_pull_range (trans->sinkpad, offset, length, &inbuf);
2243 if (G_UNLIKELY (ret != GST_FLOW_OK))
2246 if (klass->before_transform)
2247 klass->before_transform (trans, inbuf);
2249 /* Set discont flag so we can mark the next outgoing buffer */
2250 if (GST_BUFFER_IS_DISCONT (inbuf)) {
2251 GST_DEBUG_OBJECT (trans, "got DISCONT buffer %p", inbuf);
2252 priv->discont = TRUE;
2255 /* FIXME: Input offsets and lengths need to be translated, as per
2256 * the FIXME above. For now, just advance somewhat */
2257 offset += gst_buffer_get_size (inbuf);
2259 ret = klass->submit_input_buffer (trans, priv->discont, inbuf);
2260 if (ret != GST_FLOW_OK) {
2261 if (ret == GST_BASE_TRANSFORM_FLOW_DROPPED)
2265 } while (ret == GST_FLOW_OK && outbuf == NULL);
2269 /* apply DISCONT flag if the buffer is not yet marked as such */
2270 if (priv->discont) {
2271 GST_DEBUG_OBJECT (trans, "we have a pending DISCONT");
2272 if (!GST_BUFFER_IS_DISCONT (outbuf)) {
2273 GST_DEBUG_OBJECT (trans, "marking DISCONT on output buffer");
2274 outbuf = gst_buffer_make_writable (outbuf);
2275 GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DISCONT);
2277 priv->discont = FALSE;
2287 GST_DEBUG_OBJECT (trans, "failed to pull a buffer: %s",
2288 gst_flow_get_name (ret));
2293 /* The flow of the chain function is the reverse of the
2294 * getrange() function - we have data, feed it to the sub-class
2295 * and then iterate, pushing buffers it generates until it either
2296 * wants more data or returns an error */
2297 static GstFlowReturn
2298 gst_base_transform_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer)
2300 GstBaseTransform *trans = GST_BASE_TRANSFORM (parent);
2301 GstBaseTransformClass *klass = GST_BASE_TRANSFORM_GET_CLASS (trans);
2302 GstBaseTransformPrivate *priv = trans->priv;
2304 GstClockTime position = GST_CLOCK_TIME_NONE;
2305 GstClockTime timestamp, duration;
2306 GstBuffer *outbuf = NULL;
2308 timestamp = GST_BUFFER_TIMESTAMP (buffer);
2309 duration = GST_BUFFER_DURATION (buffer);
2311 /* calculate end position of the incoming buffer */
2312 if (timestamp != GST_CLOCK_TIME_NONE) {
2313 if (duration != GST_CLOCK_TIME_NONE)
2314 position = timestamp + duration;
2316 position = timestamp;
2319 if (klass->before_transform)
2320 klass->before_transform (trans, buffer);
2322 /* Set discont flag so we can mark the outgoing buffer */
2323 if (GST_BUFFER_IS_DISCONT (buffer)) {
2324 GST_DEBUG_OBJECT (trans, "got DISCONT buffer %p", buffer);
2325 priv->discont = TRUE;
2328 /* Takes ownership of input buffer */
2329 ret = klass->submit_input_buffer (trans, priv->discont, buffer);
2330 if (ret != GST_FLOW_OK)
2336 ret = klass->generate_output (trans, &outbuf);
2338 /* outbuf can be NULL, this means a dropped buffer, if we have a buffer but
2339 * GST_BASE_TRANSFORM_FLOW_DROPPED we will not push either. */
2340 if (outbuf != NULL) {
2341 if (ret == GST_FLOW_OK) {
2342 GstClockTime position_out = GST_CLOCK_TIME_NONE;
2344 /* Remember last stop position */
2345 if (position != GST_CLOCK_TIME_NONE &&
2346 trans->segment.format == GST_FORMAT_TIME)
2347 trans->segment.position = position;
2349 if (GST_BUFFER_TIMESTAMP_IS_VALID (outbuf)) {
2350 position_out = GST_BUFFER_TIMESTAMP (outbuf);
2351 if (GST_BUFFER_DURATION_IS_VALID (outbuf))
2352 position_out += GST_BUFFER_DURATION (outbuf);
2353 } else if (position != GST_CLOCK_TIME_NONE) {
2354 position_out = position;
2356 if (position_out != GST_CLOCK_TIME_NONE
2357 && trans->segment.format == GST_FORMAT_TIME)
2358 priv->position_out = position_out;
2360 /* apply DISCONT flag if the buffer is not yet marked as such */
2361 if (trans->priv->discont) {
2362 GST_DEBUG_OBJECT (trans, "we have a pending DISCONT");
2363 if (!GST_BUFFER_IS_DISCONT (outbuf)) {
2364 GST_DEBUG_OBJECT (trans, "marking DISCONT on output buffer");
2365 outbuf = gst_buffer_make_writable (outbuf);
2366 GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DISCONT);
2368 priv->discont = FALSE;
2372 ret = gst_pad_push (trans->srcpad, outbuf);
2374 GST_DEBUG_OBJECT (trans, "we got return %s", gst_flow_get_name (ret));
2375 gst_buffer_unref (outbuf);
2378 } while (ret == GST_FLOW_OK && outbuf != NULL);
2381 /* convert internal flow to OK and mark discont for the next buffer. */
2382 if (ret == GST_BASE_TRANSFORM_FLOW_DROPPED) {
2383 GST_DEBUG_OBJECT (trans, "dropped a buffer, marking DISCONT");
2384 priv->discont = TRUE;
2392 gst_base_transform_set_property (GObject * object, guint prop_id,
2393 const GValue * value, GParamSpec * pspec)
2395 GstBaseTransform *trans;
2397 trans = GST_BASE_TRANSFORM (object);
2401 gst_base_transform_set_qos_enabled (trans, g_value_get_boolean (value));
2404 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
2410 gst_base_transform_get_property (GObject * object, guint prop_id,
2411 GValue * value, GParamSpec * pspec)
2413 GstBaseTransform *trans;
2415 trans = GST_BASE_TRANSFORM (object);
2419 g_value_set_boolean (value, gst_base_transform_is_qos_enabled (trans));
2422 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
2427 /* not a vmethod of anything, just an internal method */
2429 gst_base_transform_activate (GstBaseTransform * trans, gboolean active)
2431 GstBaseTransformClass *bclass;
2432 GstBaseTransformPrivate *priv = trans->priv;
2433 gboolean result = TRUE;
2435 bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
2438 GstCaps *incaps, *outcaps;
2440 if (priv->pad_mode == GST_PAD_MODE_NONE && bclass->start)
2441 result &= bclass->start (trans);
2443 incaps = gst_pad_get_current_caps (trans->sinkpad);
2444 outcaps = gst_pad_get_current_caps (trans->srcpad);
2446 GST_OBJECT_LOCK (trans);
2447 if (incaps && outcaps)
2448 priv->have_same_caps =
2449 gst_caps_is_equal (incaps, outcaps) || priv->passthrough;
2451 priv->have_same_caps = priv->passthrough;
2452 GST_DEBUG_OBJECT (trans, "have_same_caps %d", priv->have_same_caps);
2453 priv->negotiated = FALSE;
2454 trans->have_segment = FALSE;
2455 gst_segment_init (&trans->segment, GST_FORMAT_UNDEFINED);
2456 priv->position_out = GST_CLOCK_TIME_NONE;
2457 priv->proportion = 1.0;
2458 priv->earliest_time = -1;
2459 priv->discont = FALSE;
2460 priv->processed = 0;
2462 GST_OBJECT_UNLOCK (trans);
2465 gst_caps_unref (incaps);
2467 gst_caps_unref (outcaps);
2469 /* We must make sure streaming has finished before resetting things
2470 * and calling the ::stop vfunc */
2471 GST_PAD_STREAM_LOCK (trans->sinkpad);
2472 GST_PAD_STREAM_UNLOCK (trans->sinkpad);
2474 priv->have_same_caps = FALSE;
2475 /* We can only reset the passthrough mode if the instance told us to
2476 handle it in configure_caps */
2477 if (bclass->passthrough_on_same_caps) {
2478 gst_base_transform_set_passthrough (trans, FALSE);
2480 gst_caps_replace (&priv->cache_caps1, NULL);
2481 gst_caps_replace (&priv->cache_caps2, NULL);
2483 /* Make sure any left over buffer is freed */
2484 gst_buffer_replace (&trans->queued_buf, NULL);
2486 if (priv->pad_mode != GST_PAD_MODE_NONE && bclass->stop)
2487 result &= bclass->stop (trans);
2489 gst_base_transform_set_allocation (trans, NULL, NULL, NULL, NULL);
2496 gst_base_transform_sink_activate_mode (GstPad * pad, GstObject * parent,
2497 GstPadMode mode, gboolean active)
2499 gboolean result = FALSE;
2500 GstBaseTransform *trans;
2502 trans = GST_BASE_TRANSFORM (parent);
2505 case GST_PAD_MODE_PUSH:
2507 result = gst_base_transform_activate (trans, active);
2510 trans->priv->pad_mode = active ? GST_PAD_MODE_PUSH : GST_PAD_MODE_NONE;
2522 gst_base_transform_src_activate_mode (GstPad * pad, GstObject * parent,
2523 GstPadMode mode, gboolean active)
2525 gboolean result = FALSE;
2526 GstBaseTransform *trans;
2528 trans = GST_BASE_TRANSFORM (parent);
2531 case GST_PAD_MODE_PULL:
2534 gst_pad_activate_mode (trans->sinkpad, GST_PAD_MODE_PULL, active);
2537 result &= gst_base_transform_activate (trans, active);
2540 trans->priv->pad_mode = active ? mode : GST_PAD_MODE_NONE;
2552 * gst_base_transform_set_passthrough:
2553 * @trans: the #GstBaseTransform to set
2554 * @passthrough: boolean indicating passthrough mode.
2556 * Set passthrough mode for this filter by default. This is mostly
2557 * useful for filters that do not care about negotiation.
2559 * Always %TRUE for filters which don't implement either a transform
2560 * or transform_ip method.
2565 gst_base_transform_set_passthrough (GstBaseTransform * trans,
2566 gboolean passthrough)
2568 GstBaseTransformClass *bclass;
2570 g_return_if_fail (GST_IS_BASE_TRANSFORM (trans));
2572 bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
2574 GST_OBJECT_LOCK (trans);
2576 if (bclass->transform_ip || bclass->transform)
2577 trans->priv->passthrough = FALSE;
2579 trans->priv->passthrough = TRUE;
2582 GST_DEBUG_OBJECT (trans, "set passthrough %d", trans->priv->passthrough);
2583 GST_OBJECT_UNLOCK (trans);
2587 * gst_base_transform_is_passthrough:
2588 * @trans: the #GstBaseTransform to query
2590 * See if @trans is configured as a passthrough transform.
2592 * Returns: %TRUE is the transform is configured in passthrough mode.
2597 gst_base_transform_is_passthrough (GstBaseTransform * trans)
2601 g_return_val_if_fail (GST_IS_BASE_TRANSFORM (trans), FALSE);
2603 GST_OBJECT_LOCK (trans);
2604 result = trans->priv->passthrough;
2605 GST_OBJECT_UNLOCK (trans);
2611 * gst_base_transform_set_in_place:
2612 * @trans: the #GstBaseTransform to modify
2613 * @in_place: Boolean value indicating that we would like to operate
2614 * on in_place buffers.
2616 * Determines whether a non-writable buffer will be copied before passing
2617 * to the transform_ip function.
2619 * <listitem>Always %TRUE if no transform function is implemented.</listitem>
2620 * <listitem>Always %FALSE if ONLY transform function is implemented.</listitem>
2626 gst_base_transform_set_in_place (GstBaseTransform * trans, gboolean in_place)
2628 GstBaseTransformClass *bclass;
2630 g_return_if_fail (GST_IS_BASE_TRANSFORM (trans));
2632 bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
2634 GST_OBJECT_LOCK (trans);
2637 if (bclass->transform_ip) {
2638 GST_DEBUG_OBJECT (trans, "setting in_place TRUE");
2639 trans->priv->always_in_place = TRUE;
2642 if (bclass->transform) {
2643 GST_DEBUG_OBJECT (trans, "setting in_place FALSE");
2644 trans->priv->always_in_place = FALSE;
2648 GST_OBJECT_UNLOCK (trans);
2652 * gst_base_transform_is_in_place:
2653 * @trans: the #GstBaseTransform to query
2655 * See if @trans is configured as a in_place transform.
2657 * Returns: %TRUE is the transform is configured in in_place mode.
2662 gst_base_transform_is_in_place (GstBaseTransform * trans)
2666 g_return_val_if_fail (GST_IS_BASE_TRANSFORM (trans), FALSE);
2668 GST_OBJECT_LOCK (trans);
2669 result = trans->priv->always_in_place;
2670 GST_OBJECT_UNLOCK (trans);
2676 * gst_base_transform_update_qos:
2677 * @trans: a #GstBaseTransform
2678 * @proportion: the proportion
2679 * @diff: the diff against the clock
2680 * @timestamp: the timestamp of the buffer generating the QoS expressed in
2683 * Set the QoS parameters in the transform. This function is called internally
2684 * when a QOS event is received but subclasses can provide custom information
2690 gst_base_transform_update_qos (GstBaseTransform * trans,
2691 gdouble proportion, GstClockTimeDiff diff, GstClockTime timestamp)
2693 g_return_if_fail (GST_IS_BASE_TRANSFORM (trans));
2695 GST_CAT_DEBUG_OBJECT (GST_CAT_QOS, trans,
2696 "qos: proportion: %lf, diff %" G_GINT64_FORMAT ", timestamp %"
2697 GST_TIME_FORMAT, proportion, diff, GST_TIME_ARGS (timestamp));
2699 GST_OBJECT_LOCK (trans);
2700 trans->priv->proportion = proportion;
2701 trans->priv->earliest_time = timestamp + diff;
2702 GST_OBJECT_UNLOCK (trans);
2706 * gst_base_transform_set_qos_enabled:
2707 * @trans: a #GstBaseTransform
2708 * @enabled: new state
2710 * Enable or disable QoS handling in the transform.
2715 gst_base_transform_set_qos_enabled (GstBaseTransform * trans, gboolean enabled)
2717 g_return_if_fail (GST_IS_BASE_TRANSFORM (trans));
2719 GST_CAT_DEBUG_OBJECT (GST_CAT_QOS, trans, "enabled: %d", enabled);
2721 GST_OBJECT_LOCK (trans);
2722 trans->priv->qos_enabled = enabled;
2723 GST_OBJECT_UNLOCK (trans);
2727 * gst_base_transform_is_qos_enabled:
2728 * @trans: a #GstBaseTransform
2730 * Queries if the transform will handle QoS.
2732 * Returns: %TRUE if QoS is enabled.
2737 gst_base_transform_is_qos_enabled (GstBaseTransform * trans)
2741 g_return_val_if_fail (GST_IS_BASE_TRANSFORM (trans), FALSE);
2743 GST_OBJECT_LOCK (trans);
2744 result = trans->priv->qos_enabled;
2745 GST_OBJECT_UNLOCK (trans);
2751 * gst_base_transform_set_gap_aware:
2752 * @trans: a #GstBaseTransform
2753 * @gap_aware: New state
2755 * If @gap_aware is %FALSE (the default), output buffers will have the
2756 * %GST_BUFFER_FLAG_GAP flag unset.
2758 * If set to %TRUE, the element must handle output buffers with this flag set
2759 * correctly, i.e. it can assume that the buffer contains neutral data but must
2760 * unset the flag if the output is no neutral data.
2765 gst_base_transform_set_gap_aware (GstBaseTransform * trans, gboolean gap_aware)
2767 g_return_if_fail (GST_IS_BASE_TRANSFORM (trans));
2769 GST_OBJECT_LOCK (trans);
2770 trans->priv->gap_aware = gap_aware;
2771 GST_DEBUG_OBJECT (trans, "set gap aware %d", trans->priv->gap_aware);
2772 GST_OBJECT_UNLOCK (trans);
2776 * gst_base_transform_set_prefer_passthrough:
2777 * @trans: a #GstBaseTransform
2778 * @prefer_passthrough: New state
2780 * If @prefer_passthrough is %TRUE (the default), @trans will check and
2781 * prefer passthrough caps from the list of caps returned by the
2782 * transform_caps vmethod.
2784 * If set to %FALSE, the element must order the caps returned from the
2785 * transform_caps function in such a way that the preferred format is
2786 * first in the list. This can be interesting for transforms that can do
2787 * passthrough transforms but prefer to do something else, like a
2795 gst_base_transform_set_prefer_passthrough (GstBaseTransform * trans,
2796 gboolean prefer_passthrough)
2798 g_return_if_fail (GST_IS_BASE_TRANSFORM (trans));
2800 GST_OBJECT_LOCK (trans);
2801 trans->priv->prefer_passthrough = prefer_passthrough;
2802 GST_DEBUG_OBJECT (trans, "prefer passthrough %d", prefer_passthrough);
2803 GST_OBJECT_UNLOCK (trans);
2807 * gst_base_transform_reconfigure_sink:
2808 * @trans: a #GstBaseTransform
2810 * Instructs @trans to request renegotiation upstream. This function is
2811 * typically called after properties on the transform were set that
2812 * influence the input format.
2815 gst_base_transform_reconfigure_sink (GstBaseTransform * trans)
2817 g_return_if_fail (GST_IS_BASE_TRANSFORM (trans));
2819 /* push the renegotiate event */
2820 if (!gst_pad_push_event (GST_BASE_TRANSFORM_SINK_PAD (trans),
2821 gst_event_new_reconfigure ()))
2822 GST_DEBUG_OBJECT (trans, "Renegotiate event wasn't handled");
2826 * gst_base_transform_reconfigure_src:
2827 * @trans: a #GstBaseTransform
2829 * Instructs @trans to renegotiate a new downstream transform on the next
2830 * buffer. This function is typically called after properties on the transform
2831 * were set that influence the output format.
2834 gst_base_transform_reconfigure_src (GstBaseTransform * trans)
2836 g_return_if_fail (GST_IS_BASE_TRANSFORM (trans));
2838 gst_pad_mark_reconfigure (trans->srcpad);
2842 * gst_base_transform_get_buffer_pool:
2843 * @trans: a #GstBaseTransform
2845 * Returns: (transfer full): the instance of the #GstBufferPool used
2846 * by @trans; free it after use it
2849 gst_base_transform_get_buffer_pool (GstBaseTransform * trans)
2851 g_return_val_if_fail (GST_IS_BASE_TRANSFORM (trans), NULL);
2853 if (trans->priv->pool)
2854 return gst_object_ref (trans->priv->pool);
2860 * gst_base_transform_get_allocator:
2861 * @trans: a #GstBaseTransform
2862 * @allocator: (out) (allow-none) (transfer full): the #GstAllocator
2864 * @params: (out) (allow-none) (transfer full): the
2865 * #GstAllocationParams of @allocator
2867 * Lets #GstBaseTransform sub-classes to know the memory @allocator
2868 * used by the base class and its @params.
2870 * Unref the @allocator after use it.
2873 gst_base_transform_get_allocator (GstBaseTransform * trans,
2874 GstAllocator ** allocator, GstAllocationParams * params)
2876 g_return_if_fail (GST_IS_BASE_TRANSFORM (trans));
2879 *allocator = trans->priv->allocator ?
2880 gst_object_ref (trans->priv->allocator) : NULL;
2883 *params = trans->priv->params;
2887 * gst_base_transform_update_src_caps:
2888 * @trans: a #GstBaseTransform
2889 * @updated_caps: An updated version of the srcpad caps to be pushed
2892 * Updates the srcpad caps and send the caps downstream. This function
2893 * can be used by subclasses when they have already negotiated their caps
2894 * but found a change in them (or computed new informations). This way,
2895 * they can notify downstream about that change without loosing any
2898 * Returns: %TRUE if the caps could be send downstream %FALSE otherwise
2903 gst_base_transform_update_src_caps (GstBaseTransform * trans,
2904 GstCaps * updated_caps)
2906 g_return_val_if_fail (GST_IS_BASE_TRANSFORM (trans), FALSE);
2908 if (gst_pad_push_event (GST_BASE_TRANSFORM_SRC_PAD (trans),
2909 gst_event_new_caps (updated_caps))) {
2910 gst_pad_mark_reconfigure (trans->srcpad);