gstreamer/sys/v4l2/gstv4l2src.h

/* GStreamer
 *
 * gstv4l2src.h: BT8x8/V4L2 video source element
 *
 * Copyright (C) 2001-2002 Ronald Bultje <rbultje@ronald.bitfreak.net>
 *
 * 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_V4L2SRC_H__
#define __GST_V4L2SRC_H__


#include <gstv4l2element.h>

GST_DEBUG_CATEGORY_EXTERN (v4l2src_debug);

#define GST_V4L2_MAX_BUFFERS 16
#define GST_V4L2_MIN_BUFFERS 2

G_BEGIN_DECLS

#define GST_TYPE_V4L2SRC			\
  (gst_v4l2src_get_type())
#define GST_V4L2SRC(obj)						\
  (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_V4L2SRC,GstV4l2Src))
#define GST_V4L2SRC_CLASS(klass)					\
  (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_V4L2SRC,GstV4l2SrcClass))
#define GST_IS_V4L2SRC(obj)				\
  (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_V4L2SRC))
#define GST_IS_V4L2SRC_CLASS(obj)			\
  (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_V4L2SRC))


typedef struct _GstV4l2BufferPool	GstV4l2BufferPool;
typedef struct _GstV4l2Buffer		GstV4l2Buffer;
typedef struct _GstV4l2Src GstV4l2Src;
typedef struct _GstV4l2SrcClass GstV4l2SrcClass;


/* global info */
struct _GstV4l2BufferPool {
  gint  		refcount; /* number of users: 1 for every buffer, 1 for element */
  gint			video_fd;
  guint			buffer_count;
  GstV4l2Buffer *	buffers;
};

struct _GstV4l2Buffer {
  struct v4l2_buffer	buffer;
  guint8 *		start;
  guint			length;
  gint  		refcount; /* add 1 if in use by element, add 1 if in use by GstBuffer */
  GstV4l2BufferPool *	pool;
};

enum
  {
    QUEUE_STATE_ERROR = -1,
    QUEUE_STATE_READY_FOR_QUEUE,  /* the frame is ready to be queued for capture */
    QUEUE_STATE_QUEUED,           /* the frame is queued for capture */
    QUEUE_STATE_SYNCED            /* the frame is captured */
  };


struct _GstV4l2Src
{
  GstV4l2Element v4l2element;

  /* pads */
  GstPad *srcpad;

  /* internal lists */
  GSList *formats; /* list of available capture formats */

  /* buffers */
  GstV4l2BufferPool *pool;

  struct v4l2_requestbuffers breq;
  struct v4l2_format format;

  /* True if we want to stop */
  gboolean quit, is_capturing;

  gint offset;

  /* how are we going to push buffers? */
  gboolean use_fixed_fps;
};

struct _GstV4l2SrcClass
{
  GstV4l2ElementClass parent_class;
};


GType gst_v4l2src_get_type (void);


G_END_DECLS


#endif /* __GST_V4L2SRC_H__ */