gstreamer/gst/adder/gstadder.h

/* GStreamer
 * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
 *                    2000 Wim Taymans <wtay@chello.be>
 *
 * gstadder.h: Header for GstAdder element
 *
 * 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_ADDER_H__
#define __GST_ADDER_H__

#include <gst/gst.h>
#include <gst/bytestream/bytestream.h>

#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */

extern GstElementDetails gst_adder_details;

#define GST_TYPE_ADDER \
  (gst_adder_get_type())
#define GST_ADDER(obj) \
  (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_ADDER,GstAdder))
#define GST_ADDER_CLASS(klass) \
  (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_ADDER,GstAdderClass))
#define GST_IS_ADDER(obj) \
  (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_ADDER))
#define GST_IS_ADDER_CLASS(obj) \
  (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_ADDER))

typedef struct _GstAdder             GstAdder;
typedef struct _GstAdderClass        GstAdderClass;
typedef struct _GstAdderInputChannel GstAdderInputChannel;
typedef enum   _GstAdderFormat       GstAdderFormat;

enum _GstAdderFormat {
  GST_ADDER_FORMAT_UNSET,
  GST_ADDER_FORMAT_INT,
  GST_ADDER_FORMAT_FLOAT
};

struct _GstAdderInputChannel {
  GstPad        *sinkpad;
  GstByteStream *bytestream;
};

struct _GstAdder {
  GstElement      element;

  GstPad         *srcpad;
  GstBufferPool  *bufpool;
  
  /* keep track of the sinkpads */
  guint           numsinkpads;
  GSList         *input_channels;

  /* the next three are valid for both int and float */
  GstAdderFormat  format;
  guint           rate;
  guint           channels;
  
  /* the next five are valid only for format == GST_ADDER_FORMAT_INT */
  guint           width;
  guint           depth;
  guint           endianness;
  guint           law;
  gboolean        is_signed;
  
  /* the next three are valid only for format == GST_ADDER_FORMAT_FLOAT */
  const gchar    *layout;
  gfloat          slope;
  gfloat          intercept;

  /* counters to keep track of timestamps */
  gint64     	  timestamp;
  gint64     	  offset;
};

struct _GstAdderClass {
  GstElementClass parent_class;
};

GType    gst_adder_get_type (void);
gboolean gst_adder_factory_init (GstElementFactory *factory);

#ifdef __cplusplus
}
#endif /* __cplusplus */


#endif /* __GST_ADDER_H__ */