gstreamer/gst/liveadder/liveadder.h

/*
 * Farsight Voice+Video library
 *
 *  Copyright 2008 Collabora Ltd
 *  Copyright 2008 Nokia Corporation
 *   @author: Olivier Crete <olivier.crete@collabora.co.uk>
 *
 * 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_LIVE_ADDER_H__
#define __GST_LIVE_ADDER_H__

#include <gst/gst.h>

G_BEGIN_DECLS

#define GST_TYPE_LIVE_ADDER            (gst_live_adder_get_type())
#define GST_LIVE_ADDER(obj)            (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_LIVE_ADDER,GstLiveAdder))
#define GST_IS_LIVE_ADDER(obj)         (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_LIVE_ADDER))
#define GST_LIVE_ADDER_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST((klass) ,GST_TYPE_LIVE_ADDER,GstLiveAdderClass))
#define GST_IS_LIVE_ADDER_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass) ,GST_TYPE_LIVE_ADDER))
#define GST_LIVE_ADDER_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS((obj) ,GST_TYPE_LIVE_ADDER,GstLiveAdderClass))

typedef struct _GstLiveAdder             GstLiveAdder;
typedef struct _GstLiveAdderClass        GstLiveAdderClass;

typedef enum {
  GST_LIVE_ADDER_FORMAT_UNSET,
  GST_LIVE_ADDER_FORMAT_INT,
  GST_LIVE_ADDER_FORMAT_FLOAT
} GstLiveAdderFormat;

typedef void (*GstLiveAdderFunction) (gpointer out, gpointer in, guint size);

/**
 * GstLiveAdder:
 *
 * The adder object structure.
 */
struct _GstLiveAdder {
  GstElement      element;

  GstPad         *srcpad;
  /* pad counter, used for creating unique request pads */
  gint            padcount;
  GList          *sinkpads;

  GstFlowReturn   srcresult;
  GstClockID      clock_id;

  /* the queue is ordered head to tail */
  GQueue         *buffers;
  GCond          *not_empty_cond;

  GstClockTime    next_timestamp;

  /* the next are valid for both int and float */
  GstLiveAdderFormat  format;
  gint            rate;
  gint            channels;
  gint            width;
  gint            endianness;

  /* the next are valid only for format == GST_LIVE_ADDER_FORMAT_INT */
  gint            depth;
  gboolean        is_signed;

  /* number of bytes per sample, actually width/8 * channels */
  gint            bps;

  /* function to add samples */
  GstLiveAdderFunction func;

  GstClockTime    latency_ms;
  GstClockTime    peer_latency;

  gboolean        segment_pending;
};

struct _GstLiveAdderClass {
  GstElementClass parent_class;
};

GType    gst_live_adder_get_type (void);

G_END_DECLS


#endif /* __GST_LIVE_ADDER_H__ */