gstreamer/libs/gst/base/gstbasetransform.h
Wim Taymans 2db910992f gst/base/gstbasetransform.*: Handle the case where we are not negotiated more gracefully.
Original commit message from CVS:
* gst/base/gstbasetransform.c: (gst_base_transform_configure_caps),
(gst_base_transform_setcaps), (gst_base_transform_handle_buffer),
(gst_base_transform_chain), (gst_base_transform_change_state):
* gst/base/gstbasetransform.h:
Handle the case where we are not negotiated more gracefully.
2005-08-31 13:41:19 +00:00

144 lines
5.2 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))
/* the names of the templates for the sink and source pads */
#define GST_BASE_TRANSFORM_SINK_NAME "sink"
#define GST_BASE_TRANSFORM_SRC_NAME "src"
typedef struct _GstBaseTransform GstBaseTransform;
typedef struct _GstBaseTransformClass GstBaseTransformClass;
struct _GstBaseTransform {
GstElement element;
/* source and sink pads */
GstPad *sinkpad;
GstPad *srcpad;
gboolean passthrough;
gboolean in_place;
GstCaps *cache_caps1;
guint cache_caps1_size;
GstCaps *cache_caps2;
guint cache_caps2_size;
gboolean delay_configure;
gboolean pending_configure;
gboolean negotiated;
gboolean have_newsegment;
gdouble segment_rate;
gint64 segment_start;
gint64 segment_stop;
gint64 segment_base;
/*< 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.
* 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);
/*< private >*/
gpointer _gst_reserved[GST_PADDING];
};
void gst_base_transform_set_passthrough (GstBaseTransform *trans, gboolean passthrough);
gboolean gst_base_transform_is_passthrough (GstBaseTransform *trans);
GType gst_base_transform_get_type (void);
G_END_DECLS
#endif /* __GST_BASE_TRANSFORM_H__ */