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58cc3d675b
Original commit message from CVS: * libs/gst/base/gstbasetransform.c: (gst_base_transform_sink_event): Work around the brokenness of the event vmethod in basetransform. Prefer to return TRUE when the subclass returned FALSE (meaning don't forward the event). * libs/gst/base/gstbasetransform.h: Clarify the docs.
259 lines
9.4 KiB
C
259 lines
9.4 KiB
C
/* GStreamer
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* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
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* 2005 Wim Taymans <wim@fluendo.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifndef __GST_BASE_TRANSFORM_H__
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#define __GST_BASE_TRANSFORM_H__
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#include <gst/gst.h>
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G_BEGIN_DECLS
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#define GST_TYPE_BASE_TRANSFORM (gst_base_transform_get_type())
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#define GST_BASE_TRANSFORM(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_BASE_TRANSFORM,GstBaseTransform))
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#define GST_BASE_TRANSFORM_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_BASE_TRANSFORM,GstBaseTransformClass))
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#define GST_BASE_TRANSFORM_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS((obj),GST_TYPE_BASE_TRANSFORM,GstBaseTransformClass))
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#define GST_IS_BASE_TRANSFORM(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_BASE_TRANSFORM))
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#define GST_IS_BASE_TRANSFORM_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_BASE_TRANSFORM))
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/* since 0.10.4 */
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#define GST_BASE_TRANSFORM_CAST(obj) ((GstBaseTransform *)(obj))
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/**
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* GST_BASE_TRANSFORM_SINK_NAME:
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*
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* the name of the templates for the sink pad
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*/
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#define GST_BASE_TRANSFORM_SINK_NAME "sink"
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/**
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* GST_BASE_TRANSFORM_SRC_NAME:
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*
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* the name of the templates for the source pad
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*/
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#define GST_BASE_TRANSFORM_SRC_NAME "src"
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/**
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* GST_BASE_TRANSFORM_SRC_PAD:
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* @obj: base transform instance
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*
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* Gives the pointer to the source #GstPad object of the element.
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*
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* Since: 0.10.4
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*/
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#define GST_BASE_TRANSFORM_SRC_PAD(obj) (GST_BASE_TRANSFORM_CAST (obj)->srcpad)
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/**
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* GST_BASE_TRANSFORM_SINK_PAD:
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* @obj: base transform instance
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*
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* Gives the pointer to the sink #GstPad object of the element.
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*
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* Since: 0.10.4
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*/
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#define GST_BASE_TRANSFORM_SINK_PAD(obj) (GST_BASE_TRANSFORM_CAST (obj)->sinkpad)
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/**
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* GST_BASE_TRANSFORM_FLOW_DROPPED:
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*
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* A #GstFlowReturn that can be returned from transform and transform_ip to
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* indicate that no output buffer was generated.
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*
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* Since: 0.10.13
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*/
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#define GST_BASE_TRANSFORM_FLOW_DROPPED GST_FLOW_CUSTOM_SUCCESS
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/**
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* GST_BASE_TRANSFORM_LOCK:
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* @obj: base transform instance
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*
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* Obtain a lock to protect the transform function from concurrent access.
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*
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* Since: 0.10.13
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*/
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#define GST_BASE_TRANSFORM_LOCK(obj) g_mutex_lock (GST_BASE_TRANSFORM_CAST (obj)->transform_lock)
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/**
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* GST_BASE_TRANSFORM_UNLOCK:
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* @obj: base transform instance
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*
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* Release the lock that protects the transform function from concurrent access.
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*
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* Since: 0.10.13
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*/
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#define GST_BASE_TRANSFORM_UNLOCK(obj) g_mutex_unlock (GST_BASE_TRANSFORM_CAST (obj)->transform_lock)
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typedef struct _GstBaseTransform GstBaseTransform;
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typedef struct _GstBaseTransformClass GstBaseTransformClass;
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typedef struct _GstBaseTransformPrivate GstBaseTransformPrivate;
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/**
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* GstBaseTransform:
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* @element: the parent element.
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*
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* The opaque #GstBaseTransform data structure.
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*/
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struct _GstBaseTransform {
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GstElement element;
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/*< protected >*/
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/* source and sink pads */
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GstPad *sinkpad;
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GstPad *srcpad;
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/* Set by sub-class */
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gboolean passthrough;
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gboolean always_in_place;
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GstCaps *cache_caps1;
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guint cache_caps1_size;
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GstCaps *cache_caps2;
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guint cache_caps2_size;
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gboolean have_same_caps;
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gboolean delay_configure;
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gboolean pending_configure;
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gboolean negotiated;
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gboolean have_newsegment;
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/* MT-protected (with STREAM_LOCK) */
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GstSegment segment;
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GMutex *transform_lock;
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/*< private >*/
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GstBaseTransformPrivate *priv;
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gpointer _gst_reserved[GST_PADDING_LARGE - 1];
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};
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/**
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* GstBaseTransformClass:
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* @transform_caps: Optional. given the pad in this direction and the given
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* caps, what caps are allowed on the other pad in this
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* element ?
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* @fixate_caps: Optional. Given the pad in this direction and the given
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* caps, fixate the caps on the other pad.
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* @transform_size: Optional. given the size of a buffer in the given direction
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* with the given caps, calculate the size in bytes of a buffer
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* on the other pad with the given other caps.
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* The default implementation uses get_unit_size and keeps
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* the number of units the same.
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* @get_unit_size: Required if the transform is not in-place.
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* get the size in bytes of one unit for the given caps.
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* @set_caps: allows the subclass to be notified of the actual caps set.
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* @start: Optional.
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* Called when the element starts processing.
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* Allows opening external resources.
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* @stop: Optional.
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* Called when the element stops processing.
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* Allows closing external resources.
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* @transform: Required if the element does not operate in-place.
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* Transforms one incoming buffer to one outgoing buffer.
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* The function is allowed to change size/timestamp/duration
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* of the outgoing buffer.
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* @transform_ip: Required if the element operates in-place.
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* Transform the incoming buffer in-place.
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* @event: Optional.
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* Event handler on the sink pad. This function should return
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* TRUE if the base class should forward the event.
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* @src_event: Optional.
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* Event handler on the source pad.
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* @passthrough_on_same_caps: If set to TRUE, passthrough mode will be
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* automatically enabled if the caps are the same.
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* @prepare_output_buffer: Optional.
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* Subclasses can override this to do their own
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* allocation of output buffers. Elements that only do
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* analysis can return a subbuffer or even just
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* increment the reference to the input buffer (if in
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* passthrough mode)
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*
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* Subclasses can override any of the available virtual methods or not, as
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* needed. At minimum either @transform or @transform_ip need to be overridden.
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* If the element can overwrite the input data with the results (data is of the
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* same type and quantity) it should provide @transform_ip.
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*/
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struct _GstBaseTransformClass {
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GstElementClass parent_class;
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/*< public >*/
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/* virtual methods for subclasses */
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GstCaps* (*transform_caps) (GstBaseTransform *trans,
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GstPadDirection direction,
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GstCaps *caps);
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void (*fixate_caps) (GstBaseTransform *trans,
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GstPadDirection direction, GstCaps *caps,
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GstCaps *othercaps);
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gboolean (*transform_size) (GstBaseTransform *trans,
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GstPadDirection direction,
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GstCaps *caps, guint size,
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GstCaps *othercaps, guint *othersize);
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gboolean (*get_unit_size) (GstBaseTransform *trans, GstCaps *caps,
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guint *size);
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gboolean (*set_caps) (GstBaseTransform *trans, GstCaps *incaps,
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GstCaps *outcaps);
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gboolean (*start) (GstBaseTransform *trans);
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gboolean (*stop) (GstBaseTransform *trans);
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gboolean (*event) (GstBaseTransform *trans, GstEvent *event);
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GstFlowReturn (*transform) (GstBaseTransform *trans, GstBuffer *inbuf,
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GstBuffer *outbuf);
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GstFlowReturn (*transform_ip) (GstBaseTransform *trans, GstBuffer *buf);
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/* FIXME: When adjusting the padding, move these to nicer places in the class */
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gboolean passthrough_on_same_caps;
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GstFlowReturn (*prepare_output_buffer) (GstBaseTransform * trans,
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GstBuffer *input, gint size, GstCaps *caps, GstBuffer **buf);
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/* src event */
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gboolean (*src_event) (GstBaseTransform *trans, GstEvent *event);
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/*< private >*/
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gpointer _gst_reserved[GST_PADDING_LARGE - 1];
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};
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GType gst_base_transform_get_type (void);
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void gst_base_transform_set_passthrough (GstBaseTransform *trans,
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gboolean passthrough);
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gboolean gst_base_transform_is_passthrough (GstBaseTransform *trans);
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void gst_base_transform_set_in_place (GstBaseTransform *trans,
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gboolean in_place);
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gboolean gst_base_transform_is_in_place (GstBaseTransform *trans);
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void gst_base_transform_update_qos (GstBaseTransform *trans,
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gdouble proportion,
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GstClockTimeDiff diff,
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GstClockTime timestamp);
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void gst_base_transform_set_qos_enabled (GstBaseTransform *trans,
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gboolean enabled);
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gboolean gst_base_transform_is_qos_enabled (GstBaseTransform *trans);
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G_END_DECLS
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#endif /* __GST_BASE_TRANSFORM_H__ */
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