gstreamer/libs/gst/base/gstbasetransform.h
Wim Taymans a9f7f7b7b6 Doc fixes.
Original commit message from CVS:
Doc fixes.
2005-11-24 09:44:07 +00:00

177 lines
6.3 KiB
C

/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2005 Wim Taymans <wim@fluendo.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifndef __GST_BASE_TRANSFORM_H__
#define __GST_BASE_TRANSFORM_H__
#include <gst/gst.h>
G_BEGIN_DECLS
#define GST_TYPE_BASE_TRANSFORM (gst_base_transform_get_type())
#define GST_BASE_TRANSFORM(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_BASE_TRANSFORM,GstBaseTransform))
#define GST_BASE_TRANSFORM_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_BASE_TRANSFORM,GstBaseTransformClass))
#define GST_BASE_TRANSFORM_GET_CLASS(obj) \
(G_TYPE_INSTANCE_GET_CLASS ((obj),GST_TYPE_BASE_TRANSFORM,GstBaseTransformClass))
#define GST_IS_BASE_TRANSFORM(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_BASE_TRANSFORM))
#define GST_IS_BASE_TRANSFORM_CLASS(obj)(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_BASE_TRANSFORM))
/**
* GST_BASE_TRANSFORM_SINK_NAME:
*
* the name of the templates for the sink pad
*/
#define GST_BASE_TRANSFORM_SINK_NAME "sink"
/**
* GST_BASE_TRANSFORM_SRC_NAME:
*
* the name of the templates for the source pad
*/
#define GST_BASE_TRANSFORM_SRC_NAME "src"
typedef struct _GstBaseTransform GstBaseTransform;
typedef struct _GstBaseTransformClass GstBaseTransformClass;
/**
* GstBaseTransform:
*
* The opaque #GstBaseTransform data structure.
*/
struct _GstBaseTransform {
GstElement element;
/*< protected >*/
/* source and sink pads */
GstPad *sinkpad;
GstPad *srcpad;
/* Set by sub-class */
gboolean passthrough;
gboolean always_in_place;
GstCaps *cache_caps1;
guint cache_caps1_size;
GstCaps *cache_caps2;
guint cache_caps2_size;
gboolean have_same_caps;
gboolean delay_configure;
gboolean pending_configure;
gboolean negotiated;
gboolean have_newsegment;
/* MT-protected (with STREAM_LOCK) */
GstSegment segment;
GMutex *transform_lock;
/*< private >*/
gpointer _gst_reserved[GST_PADDING];
};
/**
* GstBaseTransformClass::transform_caps:
* @direction: the pad direction
* @caps: the caps
*
* This method should answer the question "given this pad, and given these
* caps, what caps would you allow on the other pad inside your element ?"
*/
struct _GstBaseTransformClass {
GstElementClass parent_class;
/*< public >*/
/* virtual methods for subclasses */
/* given the (non-)fixed simple caps on the pad in the given direction,
* what can I do on the other pad ? */
GstCaps* (*transform_caps) (GstBaseTransform *trans,
GstPadDirection direction,
GstCaps *caps);
/* given caps on one pad, how would you fixate caps on the other pad ? */
void (*fixate_caps) (GstBaseTransform *trans,
GstPadDirection direction, GstCaps *caps,
GstCaps *othercaps);
/* given the size of a buffer in the given direction with the given caps,
* calculate the byte size of an buffer on the other side with the given
* other caps; the default
* implementation uses get_size and keeps the number of units the same */
gboolean (*transform_size) (GstBaseTransform *trans,
GstPadDirection direction,
GstCaps *caps, guint size,
GstCaps *othercaps, guint *othersize);
/* get the byte size of one unit for a given caps.
* Always needs to be implemented if the transform is not in-place. */
gboolean (*get_unit_size) (GstBaseTransform *trans, GstCaps *caps,
guint *size);
/* notify the subclass of new caps */
gboolean (*set_caps) (GstBaseTransform *trans, GstCaps *incaps,
GstCaps *outcaps);
/* start and stop processing, ideal for opening/closing the resource */
gboolean (*start) (GstBaseTransform *trans);
gboolean (*stop) (GstBaseTransform *trans);
gboolean (*event) (GstBaseTransform *trans, GstEvent *event);
/* transform one incoming buffer to one outgoing buffer.
* Always needs to be implemented unless always operating in-place.
* transform function is allowed to change size/timestamp/duration of
* the outgoing buffer. */
GstFlowReturn (*transform) (GstBaseTransform *trans, GstBuffer *inbuf,
GstBuffer *outbuf);
/* transform a buffer inplace */
GstFlowReturn (*transform_ip) (GstBaseTransform *trans, GstBuffer *buf);
/* FIXME: When adjusting the padding, more these to nicer places in the class */
/* Set by child classes to automatically do passthrough mode */
gboolean passthrough_on_same_caps;
/* Subclasses can override this to do their own allocation of output buffers.
* Elements that only do analysis can return a subbuffer or even just
* increment the reference to the input buffer (if in passthrough mode)
*/
GstFlowReturn (*prepare_output_buffer) (GstBaseTransform * trans,
GstBuffer *input, gint size, GstCaps *caps, GstBuffer **buf);
/*< private >*/
gpointer _gst_reserved[GST_PADDING - 2];
};
GType gst_base_transform_get_type (void);
void gst_base_transform_set_passthrough (GstBaseTransform *trans,
gboolean passthrough);
gboolean gst_base_transform_is_passthrough (GstBaseTransform *trans);
void gst_base_transform_set_in_place (GstBaseTransform *trans,
gboolean in_place);
gboolean gst_base_transform_is_in_place (GstBaseTransform *trans);
G_END_DECLS
#endif /* __GST_BASE_TRANSFORM_H__ */