1 /* GStreamer

     2  *

     3  * gstv4lelement.h: base class for V4L elements

     4  *

     5  * Copyright (C) 2001-2002 Ronald Bultje <rbultje@ronald.bitfreak.net>

     6  *

     7  * This library is free software; you can redistribute it and/or

     8  * modify it under the terms of the GNU Library General Public

     9  * License as published by the Free Software Foundation; either

    10  * version 2 of the License, or (at your option) any later version.

    11  *

    12  * This library is distributed in the hope that it will be useful,

    13  * but WITHOUT ANY WARRANTY; without even the implied warranty of

    14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

    15  * Library General Public License for more details.

    16  *

    17  * You should have received a copy of the GNU Library General Public

    18  * License along with this library; if not, write to the

    19  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,

    20  * Boston, MA 02111-1307, USA.

    21  */

    22 

    23 #ifndef __GST_V4LELEMENT_H__

    24 #define __GST_V4LELEMENT_H__

    25 

    26 /* Because of some really cool feature in video4linux1, also known as

    27  * 'not including sys/types.h and sys/time.h', we had to include it

    28  * ourselves. In all their intelligence, these people decided to fix

    29  * this in the next version (video4linux2) in such a cool way that it

    30  * breaks all compilations of old stuff...

    31  * The real problem is actually that linux/time.h doesn't use proper

    32  * macro checks before defining types like struct timeval. The proper

    33  * fix here is to either fuck the kernel header (which is what we do

    34  * by defining _LINUX_TIME_H, an innocent little hack) or by fixing it

    35  * upstream, which I'll consider doing later on. If you get compiler

    36  * errors here, check your linux/time.h && sys/time.h header setup.

    37  */

    38 #include <sys/types.h>

    39 #define _LINUX_TIME_H

    40 #include <linux/videodev.h>

    41 

    42 #include <gst/gst.h>

    43 #include <gst/base/gstpushsrc.h>

    44 

    45 

    46 G_BEGIN_DECLS

    47 

    48 #define GST_TYPE_V4LELEMENT \

    49   (gst_v4lelement_get_type())

    50 #define GST_V4LELEMENT(obj) \

    51   (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_V4LELEMENT,GstV4lElement))

    52 #define GST_V4LELEMENT_CLASS(klass) \

    53   (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_V4LELEMENT,GstV4lElementClass))

    54 #define GST_IS_V4LELEMENT(obj) \

    55   (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_V4LELEMENT))

    56 #define GST_IS_V4LELEMENT_CLASS(klass) \

    57   (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_V4LELEMENT))

    58 #define GST_V4LELEMENT_GET_CLASS(klass) \

    59   (G_TYPE_INSTANCE_GET_CLASS ((klass), GST_TYPE_V4LELEMENT, GstV4lElementClass))

    60 

    61 typedef struct _GstV4lElement GstV4lElement;

    62 typedef struct _GstV4lElementClass GstV4lElementClass;

    63 typedef struct _GstV4lXv GstV4lXv;

    64 

    65 struct _GstV4lElement {

    66   GstPushSrc element;

    67 

    68   /* the video device */

    69   char *videodev;

    70 

    71   /* the video-device's file descriptor */

    72   gint video_fd;

    73 

    74   /* the video buffer (mmap()'ed) */

    75   guint8 *buffer;

    76 

    77   /* the video device's capabilities */

    78   struct video_capability vcap;

    79 

    80   /* the video device's window properties */

    81   struct video_window vwin;

    82 

    83   /* some more info about the current input's capabilities */

    84   struct video_channel vchan;

    85 

    86   /* lists... */

    87   GList *colors;

    88   GList *norms;

    89   GList *channels;

    90 

    91   /* X-overlay */

    92   GstV4lXv *xv;

    93   gulong xwindow_id;

    94 };

    95 

    96 struct _GstV4lElementClass {

    97   GstPushSrcClass parent_class;

    98 

    99   /* probed devices */

   100   GList *devices;

   101 

   102   /* actions */

   103   gboolean (*get_attribute)   (GstElement  *element,

   104                                const gchar *attr_name,

   105                                int         *value);

   106   gboolean (*set_attribute)   (GstElement  *element,

   107                                const gchar *attr_name,

   108                                const int    value);

   109 };

   110 

   111 GType gst_v4lelement_get_type(void);

   112 

   113 

   114 G_END_DECLS

   115 

   116 #endif /* __GST_V4LELEMENT_H__ */