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2db910992f
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.
144 lines
5.2 KiB
C
144 lines
5.2 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) \
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(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(obj)(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_BASE_TRANSFORM))
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/* the names of the templates for the sink and source pads */
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#define GST_BASE_TRANSFORM_SINK_NAME "sink"
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#define GST_BASE_TRANSFORM_SRC_NAME "src"
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typedef struct _GstBaseTransform GstBaseTransform;
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typedef struct _GstBaseTransformClass GstBaseTransformClass;
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struct _GstBaseTransform {
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GstElement element;
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/* source and sink pads */
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GstPad *sinkpad;
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GstPad *srcpad;
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gboolean passthrough;
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gboolean 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 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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gdouble segment_rate;
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gint64 segment_start;
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gint64 segment_stop;
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gint64 segment_base;
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/*< private >*/
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gpointer _gst_reserved[GST_PADDING];
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};
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/**
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* GstBaseTransformClass::transform_caps:
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* @direction: the pad direction
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* @caps: the caps
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*
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* This method should answer the question "given this pad, and given these
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* caps, what caps would you allow on the other pad inside your element ?"
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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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/* given the (non-)fixed simple caps on the pad in the given direction,
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* what can I do on the other pad ? */
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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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/* given caps on one pad, how would you fixate caps on the other pad ? */
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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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/* given the size of a buffer in the given direction with the given caps,
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* calculate the byte size of an buffer on the other side with the given
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* other caps; the default
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* implementation uses get_size and keeps the number of units the same */
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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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/* get the byte size of one unit for a given caps.
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* Always needs to be implemented if the transform is not in-place. */
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gboolean (*get_unit_size) (GstBaseTransform *trans, GstCaps *caps,
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guint *size);
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/* notify the subclass of new caps */
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gboolean (*set_caps) (GstBaseTransform *trans, GstCaps *incaps,
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GstCaps *outcaps);
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/* start and stop processing, ideal for opening/closing the resource */
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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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/* transform one incoming buffer to one outgoing buffer.
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* Always needs to be implemented.
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* transform function is allowed to change size/timestamp/duration of
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* the outgoing buffer. */
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GstFlowReturn (*transform) (GstBaseTransform *trans, GstBuffer *inbuf,
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GstBuffer *outbuf);
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/* transform a buffer inplace */
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GstFlowReturn (*transform_ip) (GstBaseTransform *trans, GstBuffer *buf);
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/*< private >*/
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gpointer _gst_reserved[GST_PADDING];
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};
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void gst_base_transform_set_passthrough (GstBaseTransform *trans, gboolean passthrough);
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gboolean gst_base_transform_is_passthrough (GstBaseTransform *trans);
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GType gst_base_transform_get_type (void);
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G_END_DECLS
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#endif /* __GST_BASE_TRANSFORM_H__ */
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