sys/v4l2/gstv4l2object.h - mtk-gst-plugins-good-debian - Git at Google

 /* GStreamer
  *
  * Copyright (C) 2001-2002 Ronald Bultje <rbultje@ronald.bitfreak.net>
  *               2006 Edgard Lima <edgard.lima@indt.org.br>
  *
  * gstv4l2object.h: base class for V4L2 elements
  *
  * 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., 51 Franklin St, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */

 #ifndef __GST_V4L2_OBJECT_H__
 #define __GST_V4L2_OBJECT_H__

 #include "ext/videodev2.h"
 #include "v4l2-utils.h"

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

 #include <gst/video/video.h>

 typedef struct _GstV4l2Object GstV4l2Object;
 typedef struct _GstV4l2ObjectClassHelper GstV4l2ObjectClassHelper;
 typedef struct _GstV4l2Xv GstV4l2Xv;

 #include <gstv4l2bufferpool.h>

 /* size of v4l2 buffer pool in streaming case */
 #define GST_V4L2_MIN_BUFFERS 2

 /* max frame width/height */
 #define GST_V4L2_MAX_SIZE (1<<15) /* 2^15 == 32768 */

 G_BEGIN_DECLS

 #define GST_TYPE_V4L2_IO_MODE (gst_v4l2_io_mode_get_type ())
 GType gst_v4l2_io_mode_get_type (void);

 #define GST_V4L2_OBJECT(obj) (GstV4l2Object *)(obj)

 typedef enum {
   GST_V4L2_IO_AUTO          = 0,
   GST_V4L2_IO_RW            = 1,
   GST_V4L2_IO_MMAP          = 2,
   GST_V4L2_IO_USERPTR       = 3,
   GST_V4L2_IO_DMABUF        = 4,
   GST_V4L2_IO_DMABUF_IMPORT = 5
 } GstV4l2IOMode;

 typedef gboolean  (*GstV4l2GetInOutFunction)  (GstV4l2Object * v4l2object, gint * input);
 typedef gboolean  (*GstV4l2SetInOutFunction)  (GstV4l2Object * v4l2object, gint input);
 typedef gboolean  (*GstV4l2UpdateFpsFunction) (GstV4l2Object * v4l2object);

 #define GST_V4L2_WIDTH(o)        (GST_VIDEO_INFO_WIDTH (&(o)->info))
 #define GST_V4L2_HEIGHT(o)       (GST_VIDEO_INFO_HEIGHT (&(o)->info))
 #define GST_V4L2_PIXELFORMAT(o)  ((o)->fmtdesc->pixelformat)
 #define GST_V4L2_FPS_N(o)        (GST_VIDEO_INFO_FPS_N (&(o)->info))
 #define GST_V4L2_FPS_D(o)        (GST_VIDEO_INFO_FPS_D (&(o)->info))

 /* simple check whether the device is open */
 #define GST_V4L2_IS_OPEN(o)      ((o)->video_fd > 0)

 /* check whether the device is 'active' */
 #define GST_V4L2_IS_ACTIVE(o)    ((o)->active)
 #define GST_V4L2_SET_ACTIVE(o)   ((o)->active = TRUE)
 #define GST_V4L2_SET_INACTIVE(o) ((o)->active = FALSE)

 struct _GstV4l2Object {
   GstElement * element;

   enum v4l2_buf_type type;   /* V4L2_BUF_TYPE_VIDEO_CAPTURE, V4L2_BUF_TYPE_VIDEO_OUTPUT */

   /* the video device */
   char *videodev;

   /* the video-device's file descriptor */
   gint video_fd;
   GstV4l2IOMode mode;

   gboolean active;
   gboolean streaming;

   /* the current format */
   struct v4l2_fmtdesc *fmtdesc;
   struct v4l2_format format;
   GstVideoInfo info;
   GstVideoAlignment align;

   /* Features */
   gboolean need_video_meta;
   gboolean has_alpha_component;

   /* only used if the device supports MPLANE
    * nb planes is meaning of v4l2 planes
    * the gstreamer equivalent is gst_buffer_n_memory
    */
   gint n_v4l2_planes;

   /* We cache the frame duration if known */
   GstClockTime duration;

   /* if the MPLANE device support both contiguous and non contiguous
    * it allows to select which one we want. But we prefered_non_contiguous
    * non contiguous mode.
    */
   gboolean prefered_non_contiguous;

   /* This will be set if supported in decide_allocation. It can be used to
    * calculate the minimum latency. */
   guint32 min_buffers;

   /* This will be set if supported in propose allocation. */
   guint32 min_buffers_for_output;

   /* wanted mode */
   GstV4l2IOMode req_mode;

   /* optional pool */
   GstBufferPool *pool;

   /* the video device's capabilities */
   struct v4l2_capability vcap;
   /* opened device specific capabilities */
   guint32 device_caps;

   /* the video device's window properties */
   struct v4l2_window vwin;

   /* some more info about the current input's capabilities */
   struct v4l2_input vinput;

   /* lists... */
   GSList *formats;              /* list of available capture formats */
   GstCaps *probed_caps;

   GList *colors;
   GList *norms;
   GList *channels;
   GData *controls;

   /* properties */
   v4l2_std_id tv_norm;
   gchar *channel;
   gulong frequency;
   GstStructure *extra_controls;
   gboolean keep_aspect;
   GValue *par;

   /* X-overlay */
   GstV4l2Xv *xv;
   gulong xwindow_id;

   /* funcs */
   GstV4l2GetInOutFunction  get_in_out_func;
   GstV4l2SetInOutFunction  set_in_out_func;
   GstV4l2UpdateFpsFunction update_fps_func;

   /* Quirks */
   /* Skips interlacing probes */
   gboolean never_interlaced;
   /* Allow to skip reading initial format through G_FMT. Some devices
    * just fails if you don't call S_FMT first. (ex: M2M decoders) */
   gboolean no_initial_format;
 };

 struct _GstV4l2ObjectClassHelper {
   /* probed devices */
   GList *devices;
 };

 GType gst_v4l2_object_get_type (void);

 #define V4L2_STD_OBJECT_PROPS \
     PROP_DEVICE,              \
     PROP_DEVICE_NAME,         \
     PROP_DEVICE_FD,           \
     PROP_FLAGS,               \
     PROP_BRIGHTNESS,          \
     PROP_CONTRAST,            \
     PROP_SATURATION,          \
     PROP_HUE,                 \
     PROP_TV_NORM,             \
     PROP_IO_MODE,             \
     PROP_OUTPUT_IO_MODE,      \
     PROP_CAPTURE_IO_MODE,     \
     PROP_EXTRA_CONTROLS,      \
     PROP_PIXEL_ASPECT_RATIO,  \
     PROP_FORCE_ASPECT_RATIO

 /* create/destroy */
 GstV4l2Object*  gst_v4l2_object_new       (GstElement * element,
                                            enum v4l2_buf_type  type,
                                            const char * default_device,
                                            GstV4l2GetInOutFunction get_in_out_func,
                                            GstV4l2SetInOutFunction set_in_out_func,
                                            GstV4l2UpdateFpsFunction update_fps_func);

 void            gst_v4l2_object_destroy   (GstV4l2Object * v4l2object);

 /* properties */

 void         gst_v4l2_object_install_properties_helper (GObjectClass * gobject_class,
                                                         const char * default_device);

 void         gst_v4l2_object_install_m2m_properties_helper (GObjectClass * gobject_class);

 gboolean     gst_v4l2_object_set_property_helper       (GstV4l2Object * v4l2object,
                                                         guint prop_id,
                                                         const GValue * value,
                                                         GParamSpec * pspec);
 gboolean     gst_v4l2_object_get_property_helper       (GstV4l2Object *v4l2object,
                                                         guint prop_id, GValue * value,
                                                         GParamSpec * pspec);
 /* open/close */
 gboolean     gst_v4l2_object_open            (GstV4l2Object *v4l2object);
 gboolean     gst_v4l2_object_open_shared     (GstV4l2Object *v4l2object, GstV4l2Object *other);
 gboolean     gst_v4l2_object_close           (GstV4l2Object *v4l2object);

 /* probing */
 #if 0
 const GList* gst_v4l2_probe_get_properties  (GstPropertyProbe * probe);

 void         gst_v4l2_probe_probe_property  (GstPropertyProbe * probe, guint prop_id,
                                              const GParamSpec * pspec,
                                              GList ** klass_devices);
 gboolean     gst_v4l2_probe_needs_probe     (GstPropertyProbe * probe, guint prop_id,
                                              const GParamSpec * pspec,
                                              GList ** klass_devices);
 GValueArray* gst_v4l2_probe_get_values      (GstPropertyProbe * probe, guint prop_id,
                                              const GParamSpec * pspec,
                                              GList ** klass_devices);
 #endif

 GstCaps*      gst_v4l2_object_get_all_caps (void);

 GstCaps*      gst_v4l2_object_get_raw_caps (void);

 GstCaps*      gst_v4l2_object_get_codec_caps (void);

 gint          gst_v4l2_object_extrapolate_stride (const GstVideoFormatInfo * finfo,
                                                   gint plane, gint stride);

 gboolean      gst_v4l2_object_set_format  (GstV4l2Object * v4l2object, GstCaps * caps, GstV4l2Error *error);
 gboolean      gst_v4l2_object_try_format  (GstV4l2Object * v4l2object, GstCaps * caps, GstV4l2Error *error);

 gboolean      gst_v4l2_object_caps_equal  (GstV4l2Object * v4l2object, GstCaps * caps);

 gboolean      gst_v4l2_object_unlock      (GstV4l2Object * v4l2object);
 gboolean      gst_v4l2_object_unlock_stop (GstV4l2Object * v4l2object);

 gboolean      gst_v4l2_object_stop        (GstV4l2Object * v4l2object);

 GstCaps *     gst_v4l2_object_probe_caps  (GstV4l2Object * v4l2object,
                                            GstCaps * filter);
 GstCaps *     gst_v4l2_object_get_caps    (GstV4l2Object * v4l2object,
                                            GstCaps * filter);

 gboolean      gst_v4l2_object_acquire_format (GstV4l2Object * v4l2object,
                                               GstVideoInfo * info);

 gboolean      gst_v4l2_object_set_crop    (GstV4l2Object * obj);

 gboolean      gst_v4l2_object_decide_allocation (GstV4l2Object * v4l2object,
                                                  GstQuery * query);

 gboolean      gst_v4l2_object_propose_allocation (GstV4l2Object * obj,
                                                   GstQuery * query);

 GstStructure * gst_v4l2_object_v4l2fourcc_to_structure (guint32 fourcc);


 #define GST_IMPLEMENT_V4L2_PROBE_METHODS(Type_Class, interface_as_function)                 \
                                                                                             \
 static void                                                                                 \
 interface_as_function ## _probe_probe_property (GstPropertyProbe * probe,                   \
                                                 guint prop_id,                              \
                                                 const GParamSpec * pspec)                   \
 {                                                                                           \
   Type_Class *this_class = (Type_Class*) G_OBJECT_GET_CLASS (probe);                        \
   gst_v4l2_probe_probe_property (probe, prop_id, pspec,                                     \
                                  &this_class->v4l2_class_devices);                          \
 }                                                                                           \
                                                                                             \
 static gboolean                                                                             \
 interface_as_function ## _probe_needs_probe (GstPropertyProbe * probe,                      \
                                              guint prop_id,                                 \
                                              const GParamSpec * pspec)                      \
 {                                                                                           \
   Type_Class *this_class = (Type_Class*) G_OBJECT_GET_CLASS (probe);                        \
   return gst_v4l2_probe_needs_probe (probe, prop_id, pspec,                                 \
                                      &this_class->v4l2_class_devices);                      \
 }                                                                                           \
                                                                                             \
 static GValueArray *                                                                        \
 interface_as_function ## _probe_get_values (GstPropertyProbe * probe,                       \
                                             guint prop_id,                                  \
                                             const GParamSpec * pspec)                       \
 {                                                                                           \
   Type_Class *this_class = (Type_Class*) G_OBJECT_GET_CLASS (probe);                        \
   return gst_v4l2_probe_get_values (probe, prop_id, pspec,                                  \
                                     &this_class->v4l2_class_devices);                       \
 }                                                                                           \
                                                                                             \
 static void                                                                                 \
 interface_as_function ## _property_probe_interface_init (GstPropertyProbeInterface * iface) \
 {                                                                                           \
   iface->get_properties = gst_v4l2_probe_get_properties;                                    \
   iface->probe_property = interface_as_function ## _probe_probe_property;                   \
   iface->needs_probe = interface_as_function ## _probe_needs_probe;                         \
   iface->get_values = interface_as_function ## _probe_get_values;                           \
 }

 G_END_DECLS

 #endif /* __GST_V4L2_OBJECT_H__ */
	/* GStreamer
	*
	* Copyright (C) 2001-2002 Ronald Bultje <rbultje@ronald.bitfreak.net>
	* 2006 Edgard Lima <edgard.lima@indt.org.br>
	*
	* gstv4l2object.h: base class for V4L2 elements
	*
	* 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., 51 Franklin St, Fifth Floor,
	* Boston, MA 02110-1301, USA.
	*/

	#ifndef __GST_V4L2_OBJECT_H__
	#define __GST_V4L2_OBJECT_H__

	#include "ext/videodev2.h"
	#include "v4l2-utils.h"

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

	#include <gst/video/video.h>

	typedef struct _GstV4l2Object GstV4l2Object;
	typedef struct _GstV4l2ObjectClassHelper GstV4l2ObjectClassHelper;
	typedef struct _GstV4l2Xv GstV4l2Xv;

	#include <gstv4l2bufferpool.h>

	/* size of v4l2 buffer pool in streaming case */
	#define GST_V4L2_MIN_BUFFERS 2

	/* max frame width/height */
	#define GST_V4L2_MAX_SIZE (1<<15) /* 2^15 == 32768 */

	G_BEGIN_DECLS

	#define GST_TYPE_V4L2_IO_MODE (gst_v4l2_io_mode_get_type ())
	GType gst_v4l2_io_mode_get_type (void);

	#define GST_V4L2_OBJECT(obj) (GstV4l2Object *)(obj)

	typedef enum {
	GST_V4L2_IO_AUTO = 0,
	GST_V4L2_IO_RW = 1,
	GST_V4L2_IO_MMAP = 2,
	GST_V4L2_IO_USERPTR = 3,
	GST_V4L2_IO_DMABUF = 4,
	GST_V4L2_IO_DMABUF_IMPORT = 5
	} GstV4l2IOMode;

	typedef gboolean (GstV4l2GetInOutFunction) (GstV4l2Object v4l2object, gint * input);
	typedef gboolean (GstV4l2SetInOutFunction) (GstV4l2Object v4l2object, gint input);
	typedef gboolean (GstV4l2UpdateFpsFunction) (GstV4l2Object v4l2object);

	#define GST_V4L2_WIDTH(o) (GST_VIDEO_INFO_WIDTH (&(o)->info))
	#define GST_V4L2_HEIGHT(o) (GST_VIDEO_INFO_HEIGHT (&(o)->info))
	#define GST_V4L2_PIXELFORMAT(o) ((o)->fmtdesc->pixelformat)
	#define GST_V4L2_FPS_N(o) (GST_VIDEO_INFO_FPS_N (&(o)->info))
	#define GST_V4L2_FPS_D(o) (GST_VIDEO_INFO_FPS_D (&(o)->info))

	/* simple check whether the device is open */
	#define GST_V4L2_IS_OPEN(o) ((o)->video_fd > 0)

	/* check whether the device is 'active' */
	#define GST_V4L2_IS_ACTIVE(o) ((o)->active)
	#define GST_V4L2_SET_ACTIVE(o) ((o)->active = TRUE)
	#define GST_V4L2_SET_INACTIVE(o) ((o)->active = FALSE)

	struct _GstV4l2Object {
	GstElement * element;

	enum v4l2_buf_type type; /* V4L2_BUF_TYPE_VIDEO_CAPTURE, V4L2_BUF_TYPE_VIDEO_OUTPUT */

	/* the video device */
	char *videodev;

	/* the video-device's file descriptor */
	gint video_fd;
	GstV4l2IOMode mode;

	gboolean active;
	gboolean streaming;

	/* the current format */
	struct v4l2_fmtdesc *fmtdesc;
	struct v4l2_format format;
	GstVideoInfo info;
	GstVideoAlignment align;

	/* Features */
	gboolean need_video_meta;
	gboolean has_alpha_component;

	/* only used if the device supports MPLANE
	* nb planes is meaning of v4l2 planes
	* the gstreamer equivalent is gst_buffer_n_memory
	*/
	gint n_v4l2_planes;

	/* We cache the frame duration if known */
	GstClockTime duration;

	/* if the MPLANE device support both contiguous and non contiguous
	* it allows to select which one we want. But we prefered_non_contiguous
	* non contiguous mode.
	*/
	gboolean prefered_non_contiguous;

	/* This will be set if supported in decide_allocation. It can be used to
	* calculate the minimum latency. */
	guint32 min_buffers;

	/* This will be set if supported in propose allocation. */
	guint32 min_buffers_for_output;

	/* wanted mode */
	GstV4l2IOMode req_mode;

	/* optional pool */
	GstBufferPool *pool;

	/* the video device's capabilities */
	struct v4l2_capability vcap;
	/* opened device specific capabilities */
	guint32 device_caps;

	/* the video device's window properties */
	struct v4l2_window vwin;

	/* some more info about the current input's capabilities */
	struct v4l2_input vinput;

	/* lists... */
	GSList formats; / list of available capture formats */
	GstCaps *probed_caps;

	GList *colors;
	GList *norms;
	GList *channels;
	GData *controls;

	/* properties */
	v4l2_std_id tv_norm;
	gchar *channel;
	gulong frequency;
	GstStructure *extra_controls;
	gboolean keep_aspect;
	GValue *par;

	/* X-overlay */
	GstV4l2Xv *xv;
	gulong xwindow_id;

	/* funcs */
	GstV4l2GetInOutFunction get_in_out_func;
	GstV4l2SetInOutFunction set_in_out_func;
	GstV4l2UpdateFpsFunction update_fps_func;

	/* Quirks */
	/* Skips interlacing probes */
	gboolean never_interlaced;
	/* Allow to skip reading initial format through G_FMT. Some devices
	* just fails if you don't call S_FMT first. (ex: M2M decoders) */
	gboolean no_initial_format;
	};

	struct _GstV4l2ObjectClassHelper {
	/* probed devices */
	GList *devices;
	};

	GType gst_v4l2_object_get_type (void);

	#define V4L2_STD_OBJECT_PROPS \
	PROP_DEVICE, \
	PROP_DEVICE_NAME, \
	PROP_DEVICE_FD, \
	PROP_FLAGS, \
	PROP_BRIGHTNESS, \
	PROP_CONTRAST, \
	PROP_SATURATION, \
	PROP_HUE, \
	PROP_TV_NORM, \
	PROP_IO_MODE, \
	PROP_OUTPUT_IO_MODE, \
	PROP_CAPTURE_IO_MODE, \
	PROP_EXTRA_CONTROLS, \
	PROP_PIXEL_ASPECT_RATIO, \
	PROP_FORCE_ASPECT_RATIO

	/* create/destroy */
	GstV4l2Object* gst_v4l2_object_new (GstElement * element,
	enum v4l2_buf_type type,
	const char * default_device,
	GstV4l2GetInOutFunction get_in_out_func,
	GstV4l2SetInOutFunction set_in_out_func,
	GstV4l2UpdateFpsFunction update_fps_func);

	void gst_v4l2_object_destroy (GstV4l2Object * v4l2object);

	/* properties */

	void gst_v4l2_object_install_properties_helper (GObjectClass * gobject_class,
	const char * default_device);

	void gst_v4l2_object_install_m2m_properties_helper (GObjectClass * gobject_class);

	gboolean gst_v4l2_object_set_property_helper (GstV4l2Object * v4l2object,
	guint prop_id,
	const GValue * value,
	GParamSpec * pspec);
	gboolean gst_v4l2_object_get_property_helper (GstV4l2Object *v4l2object,
	guint prop_id, GValue * value,
	GParamSpec * pspec);
	/* open/close */
	gboolean gst_v4l2_object_open (GstV4l2Object *v4l2object);
	gboolean gst_v4l2_object_open_shared (GstV4l2Object v4l2object, GstV4l2Object other);
	gboolean gst_v4l2_object_close (GstV4l2Object *v4l2object);

	/* probing */
	#if 0
	const GList* gst_v4l2_probe_get_properties (GstPropertyProbe * probe);

	void gst_v4l2_probe_probe_property (GstPropertyProbe * probe, guint prop_id,
	const GParamSpec * pspec,
	GList ** klass_devices);
	gboolean gst_v4l2_probe_needs_probe (GstPropertyProbe * probe, guint prop_id,
	const GParamSpec * pspec,
	GList ** klass_devices);
	GValueArray* gst_v4l2_probe_get_values (GstPropertyProbe * probe, guint prop_id,
	const GParamSpec * pspec,
	GList ** klass_devices);
	#endif

	GstCaps* gst_v4l2_object_get_all_caps (void);

	GstCaps* gst_v4l2_object_get_raw_caps (void);

	GstCaps* gst_v4l2_object_get_codec_caps (void);

	gint gst_v4l2_object_extrapolate_stride (const GstVideoFormatInfo * finfo,
	gint plane, gint stride);

	gboolean gst_v4l2_object_set_format (GstV4l2Object * v4l2object, GstCaps * caps, GstV4l2Error *error);
	gboolean gst_v4l2_object_try_format (GstV4l2Object * v4l2object, GstCaps * caps, GstV4l2Error *error);

	gboolean gst_v4l2_object_caps_equal (GstV4l2Object * v4l2object, GstCaps * caps);

	gboolean gst_v4l2_object_unlock (GstV4l2Object * v4l2object);
	gboolean gst_v4l2_object_unlock_stop (GstV4l2Object * v4l2object);

	gboolean gst_v4l2_object_stop (GstV4l2Object * v4l2object);

	GstCaps * gst_v4l2_object_probe_caps (GstV4l2Object * v4l2object,
	GstCaps * filter);
	GstCaps * gst_v4l2_object_get_caps (GstV4l2Object * v4l2object,
	GstCaps * filter);

	gboolean gst_v4l2_object_acquire_format (GstV4l2Object * v4l2object,
	GstVideoInfo * info);

	gboolean gst_v4l2_object_set_crop (GstV4l2Object * obj);

	gboolean gst_v4l2_object_decide_allocation (GstV4l2Object * v4l2object,
	GstQuery * query);

	gboolean gst_v4l2_object_propose_allocation (GstV4l2Object * obj,
	GstQuery * query);

	GstStructure * gst_v4l2_object_v4l2fourcc_to_structure (guint32 fourcc);


	#define GST_IMPLEMENT_V4L2_PROBE_METHODS(Type_Class, interface_as_function) \
	\
	static void \
	interface_as_function ## _probe_probe_property (GstPropertyProbe * probe, \
	guint prop_id, \
	const GParamSpec * pspec) \
	{ \
	Type_Class this_class = (Type_Class) G_OBJECT_GET_CLASS (probe); \
	gst_v4l2_probe_probe_property (probe, prop_id, pspec, \
	&this_class->v4l2_class_devices); \
	} \
	\
	static gboolean \
	interface_as_function ## _probe_needs_probe (GstPropertyProbe * probe, \
	guint prop_id, \
	const GParamSpec * pspec) \
	{ \
	Type_Class this_class = (Type_Class) G_OBJECT_GET_CLASS (probe); \
	return gst_v4l2_probe_needs_probe (probe, prop_id, pspec, \
	&this_class->v4l2_class_devices); \
	} \
	\
	static GValueArray * \
	interface_as_function ## _probe_get_values (GstPropertyProbe * probe, \
	guint prop_id, \
	const GParamSpec * pspec) \
	{ \
	Type_Class this_class = (Type_Class) G_OBJECT_GET_CLASS (probe); \
	return gst_v4l2_probe_get_values (probe, prop_id, pspec, \
	&this_class->v4l2_class_devices); \
	} \
	\
	static void \
	interface_as_function ## _property_probe_interface_init (GstPropertyProbeInterface * iface) \
	{ \
	iface->get_properties = gst_v4l2_probe_get_properties; \
	iface->probe_property = interface_as_function ## _probe_probe_property; \
	iface->needs_probe = interface_as_function ## _probe_needs_probe; \
	iface->get_values = interface_as_function ## _probe_get_values; \
	}

	G_END_DECLS

	#endif /* __GST_V4L2_OBJECT_H__ */