sys/v4l2/gstv4l2object.h

   1 /* GStreamer
   2  *
   3  * Copyright (C) 2001-2002 Ronald Bultje <rbultje@ronald.bitfreak.net>
   4  *               2006 Edgard Lima <edgard.lima@indt.org.br>
   5  *
   6  * gstv4l2object.h: base class for V4L2 elements
   7  *
   8  * This library is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Library General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2 of the License, or (at your option) any later version.
  12  *
  13  * This library is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Library General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Library General Public
  19  * License along with this library; if not, write to the
  20  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  21  * Boston, MA 02111-1307, USA.
  22  */
  23
  24 #ifndef __GST_V4L2_OBJECT_H__
  25 #define __GST_V4L2_OBJECT_H__
  26
  27 /* Because of some really cool feature in video4linux1, also known as
  28  * 'not including sys/types.h and sys/time.h', we had to include it
  29  * ourselves. In all their intelligence, these people decided to fix
  30  * this in the next version (video4linux2) in such a cool way that it
  31  * breaks all compilations of old stuff...
  32  * The real problem is actually that linux/time.h doesn't use proper
  33  * macro checks before defining types like struct timeval. The proper
  34  * fix here is to either fuck the kernel header (which is what we do
  35  * by defining _LINUX_TIME_H, an innocent little hack) or by fixing it
  36  * upstream, which I'll consider doing later on. If you get compiler
  37  * errors here, check your linux/time.h && sys/time.h header setup.
  38  */
  39 #include <sys/ioctl.h>
  40 #include <sys/types.h>
  41 #ifndef __sun
  42 #include <linux/types.h>
  43 #define _LINUX_TIME_H
  44 #define __user
  45 #include <linux/videodev2.h>
  46 #else
  47 #include <sys/videodev2.h>
  48 #endif
  49
  50 #include <gst/gst.h>
  51 #include <gst/base/gstpushsrc.h>
  52 #include <gst/controller/gstcontroller.h>
  53
  54 #include <gst/interfaces/propertyprobe.h>
  55
  56
  57 /* size of v4l2 buffer pool in streaming case */
  58 #define GST_V4L2_MAX_BUFFERS 16
  59 #define GST_V4L2_MIN_BUFFERS 1
  60
  61 /* max frame width/height */
  62 #define GST_V4L2_MAX_SIZE (1<<15) /* 2^15 == 32768 */
  63
  64
  65
  66 G_BEGIN_DECLS
  67
  68 #define GST_V4L2_OBJECT(obj) (GstV4l2Object *)(obj)
  69
  70 typedef struct _GstV4l2Object GstV4l2Object;
  71 typedef struct _GstV4l2ObjectClassHelper GstV4l2ObjectClassHelper;
  72 typedef struct _GstV4l2Xv GstV4l2Xv;
  73
  74 typedef gboolean  (*GstV4l2GetInOutFunction)  (GstV4l2Object * v4l2object, gint * input);
  75 typedef gboolean  (*GstV4l2SetInOutFunction)  (GstV4l2Object * v4l2object, gint input);
  76 typedef gboolean  (*GstV4l2UpdateFpsFunction) (GstV4l2Object * v4l2object);
  77
  78 struct _GstV4l2Object {
  79   GstElement * element;
  80
  81   /* the video device */
  82   char *videodev;
  83
  84   /* the video-device's file descriptor */
  85   gint video_fd;
  86   GstPoll * poll;
  87   gboolean can_poll_device;
  88
  89   /* the video buffer (mmap()'ed) */
  90   guint8 **buffer;
  91
  92   enum v4l2_buf_type type;   /* V4L2_BUF_TYPE_VIDEO_CAPTURE, V4L2_BUF_TYPE_VIDEO_OUTPUT */
  93
  94   /* the video device's capabilities */
  95   struct v4l2_capability vcap;
  96
  97   /* the video device's window properties */
  98   struct v4l2_window vwin;
  99
 100   /* some more info about the current input's capabilities */
 101   struct v4l2_input vinput;
 102
 103   /* lists... */
 104   GSList *formats;              /* list of available capture formats */
 105
 106   GList *colors;
 107   GList *norms;
 108   GList *channels;
 109
 110   /* properties */
 111   gchar *norm;
 112   gchar *channel;
 113   gulong frequency;
 114
 115   /* X-overlay */
 116   GstV4l2Xv *xv;
 117   gulong xwindow_id;
 118
 119   /* funcs */
 120   GstV4l2GetInOutFunction  get_in_out_func;
 121   GstV4l2SetInOutFunction  set_in_out_func;
 122   GstV4l2UpdateFpsFunction update_fps_func;
 123 };
 124
 125 struct _GstV4l2ObjectClassHelper {
 126   /* probed devices */
 127   GList *devices;
 128 };
 129
 130 GType gst_v4l2_object_get_type (void);
 131
 132 #define V4L2_STD_OBJECT_PROPS           \
 133     PROP_DEVICE,                        \
 134     PROP_DEVICE_NAME,                   \
 135     PROP_DEVICE_FD,                     \
 136     PROP_FLAGS,                 \
 137     PROP_BRIGHTNESS,                    \
 138     PROP_CONTRAST,                      \
 139     PROP_SATURATION,                    \
 140     PROP_HUE
 141
 142 /* create/destroy */
 143 GstV4l2Object * gst_v4l2_object_new              (GstElement * element,
 144                                                   enum v4l2_buf_type  type,
 145                                                   const char *default_device,
 146                                                   GstV4l2GetInOutFunction get_in_out_func,
 147                                                   GstV4l2SetInOutFunction set_in_out_func,
 148                                                   GstV4l2UpdateFpsFunction   update_fps_func);
 149 void            gst_v4l2_object_destroy          (GstV4l2Object * v4l2object);
 150
 151 /* properties */
 152
 153 void      gst_v4l2_object_install_properties_helper (GObjectClass *gobject_class, const char *default_device);
 154
 155 gboolean  gst_v4l2_object_set_property_helper       (GstV4l2Object *v4l2object,
 156                                                      guint prop_id, const GValue * value,
 157                                                      GParamSpec * pspec);
 158 gboolean  gst_v4l2_object_get_property_helper       (GstV4l2Object *v4l2object,
 159                                                      guint prop_id, GValue * value,
 160                                                      GParamSpec * pspec);
 161 /* starting/stopping */
 162 gboolean  gst_v4l2_object_start             (GstV4l2Object *v4l2object);
 163 gboolean  gst_v4l2_object_stop              (GstV4l2Object *v4l2object);
 164
 165 /* probing */
 166 const GList* gst_v4l2_probe_get_properties  (GstPropertyProbe * probe);
 167
 168 void         gst_v4l2_probe_probe_property  (GstPropertyProbe * probe, guint prop_id,
 169                                              const GParamSpec * pspec,
 170                                              GList ** klass_devices);
 171 gboolean     gst_v4l2_probe_needs_probe     (GstPropertyProbe * probe, guint prop_id,
 172                                              const GParamSpec * pspec,
 173                                              GList ** klass_devices);
 174 GValueArray* gst_v4l2_probe_get_values      (GstPropertyProbe * probe, guint prop_id,
 175                                              const GParamSpec * pspec,
 176                                              GList ** klass_devices);
 177
 178 GstCaps*      gst_v4l2_object_probe_caps_for_format (GstV4l2Object *v4l2object, guint32 pixelformat,
 179                                              const GstStructure * template);
 180
 181 gboolean      gst_v4l2_object_get_caps_info (GstV4l2Object *v4l2object, GstCaps *caps,
 182                                              struct v4l2_fmtdesc **format, gint *w, gint *h,
 183                                              gboolean * interlaced, guint *fps_n, guint *fps_d, guint *size);
 184
 185
 186 GSList*       gst_v4l2_object_get_format_list  (GstV4l2Object *v4l2object);
 187
 188 GstCaps*      gst_v4l2_object_get_all_caps (void);
 189
 190 GstStructure* gst_v4l2_object_v4l2fourcc_to_structure (guint32 fourcc);
 191
 192 gboolean      gst_v4l2_object_set_format (GstV4l2Object *v4l2object, guint32 pixelformat, guint32 width, guint32 height, gboolean interlaced);
 193
 194 gboolean      gst_v4l2_object_start_streaming (GstV4l2Object *v4l2object);
 195 gboolean      gst_v4l2_object_stop_streaming (GstV4l2Object *v4l2object);
 196
 197
 198 #define GST_IMPLEMENT_V4L2_PROBE_METHODS(Type_Class, interface_as_function)                 \
 199                                                                                             \
 200 static void                                                                                 \
 201 interface_as_function ## _probe_probe_property (GstPropertyProbe * probe,                   \
 202                                                 guint prop_id,                              \
 203                                                 const GParamSpec * pspec)                   \
 204 {                                                                                           \
 205   Type_Class *this_class = (Type_Class*) G_OBJECT_GET_CLASS (probe);                        \
 206   gst_v4l2_probe_probe_property (probe, prop_id, pspec,                                     \
 207                                         &this_class->v4l2_class_devices);                   \
 208 }                                                                                           \
 209                                                                                             \
 210 static gboolean                                                                             \
 211 interface_as_function ## _probe_needs_probe (GstPropertyProbe * probe,                      \
 212                                              guint prop_id,                                 \
 213                                              const GParamSpec * pspec)                      \
 214 {                                                                                           \
 215   Type_Class *this_class = (Type_Class*) G_OBJECT_GET_CLASS (probe);                        \
 216   return gst_v4l2_probe_needs_probe (probe, prop_id, pspec,                                 \
 217                                         &this_class->v4l2_class_devices);                   \
 218 }                                                                                           \
 219                                                                                             \
 220 static GValueArray *                                                                        \
 221 interface_as_function ## _probe_get_values (GstPropertyProbe * probe,                       \
 222                                             guint prop_id,                                  \
 223                                             const GParamSpec * pspec)                       \
 224 {                                                                                           \
 225   Type_Class *this_class = (Type_Class*) G_OBJECT_GET_CLASS (probe);                        \
 226   return gst_v4l2_probe_get_values (probe, prop_id, pspec,                                  \
 227                                     &this_class->v4l2_class_devices);                       \
 228 }                                                                                           \
 229                                                                                             \
 230 static void                                                                                 \
 231 interface_as_function ## _property_probe_interface_init (GstPropertyProbeInterface * iface) \
 232 {                                                                                           \
 233   iface->get_properties = gst_v4l2_probe_get_properties;                                    \
 234   iface->probe_property = interface_as_function ## _probe_probe_property;                   \
 235   iface->needs_probe = interface_as_function ## _probe_needs_probe;                         \
 236   iface->get_values = interface_as_function ## _probe_get_values;                                            \
 237 }
 238
 239 G_END_DECLS
 240
 241 #endif /* __GST_V4L2_OBJECT_H__ */