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210 lines
8.4 KiB
C
210 lines
8.4 KiB
C
/* GStreamer
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*
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* gstv4l2object.h: base class for V4L2 elements
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*
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* Copyright (C) 2001-2002 Ronald Bultje <rbultje@ronald.bitfreak.net>
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* Copyright (C) 2006 Edgard Lima <edgard.lima@indt.org.br>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifndef __GST_V4L2_OBJECT_H__
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#define __GST_V4L2_OBJECT_H__
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/* Because of some really cool feature in video4linux1, also known as
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* 'not including sys/types.h and sys/time.h', we had to include it
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* ourselves. In all their intelligence, these people decided to fix
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* this in the next version (video4linux2) in such a cool way that it
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* breaks all compilations of old stuff...
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* The real problem is actually that linux/time.h doesn't use proper
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* macro checks before defining types like struct timeval. The proper
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* fix here is to either fuck the kernel header (which is what we do
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* by defining _LINUX_TIME_H, an innocent little hack) or by fixing it
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* upstream, which I'll consider doing later on. If you get compiler
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* errors here, check your linux/time.h && sys/time.h header setup.
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*/
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#include <sys/types.h>
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#include <linux/types.h>
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#define _LINUX_TIME_H
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#define __user
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#include <linux/videodev2.h>
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#include <gst/gst.h>
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#include <gst/base/gstpushsrc.h>
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#include <gst/interfaces/propertyprobe.h>
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G_BEGIN_DECLS
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#define GST_V4L2_OBJECT(obj) (GstV4l2Object *)(obj)
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typedef struct _GstV4l2Object GstV4l2Object;
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typedef struct _GstV4l2ObjectClassHelper GstV4l2ObjectClassHelper;
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typedef struct _GstV4l2Xv GstV4l2Xv;
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typedef gboolean (*GstV4l2GetInOutFunction) (GstV4l2Object * v4l2object, gint * input);
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typedef gboolean (*GstV4l2SetInOutFunction) (GstV4l2Object * v4l2object, gint input);
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typedef gboolean (*GstV4l2UpdateFpsFunction) (GstV4l2Object * v4l2object);
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struct _GstV4l2Object {
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GstElement * element;
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/* the video device */
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char *videodev;
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/* the video-device's file descriptor */
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gint video_fd;
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/* the video buffer (mmap()'ed) */
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guint8 **buffer;
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/* the video device's capabilities */
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struct v4l2_capability vcap;
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/* the video device's window properties */
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struct v4l2_window vwin;
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/* some more info about the current input's capabilities */
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struct v4l2_input vinput;
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/* lists... */
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GList *colors;
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GList *stds;
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GList *inputs;
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/* properties */
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gchar *std;
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gchar *input;
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gulong frequency;
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/* X-overlay */
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GstV4l2Xv *xv;
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gulong xwindow_id;
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/* funcs */
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GstV4l2GetInOutFunction get_in_out_func;
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GstV4l2SetInOutFunction set_in_out_func;
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GstV4l2UpdateFpsFunction update_fps_func;
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};
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struct _GstV4l2ObjectClassHelper {
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/* probed devices */
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GList *devices;
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};
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GType gst_v4l2_object_get_type(void);
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#define V4L2_STD_OBJECT_PROPS \
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PROP_DEVICE, \
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PROP_DEVICE_NAME, \
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PROP_FLAGS, \
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PROP_STD, \
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PROP_INPUT, \
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PROP_FREQUENCY
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extern GstV4l2Object *
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gst_v4l2_object_new (GstElement * element,
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GstV4l2GetInOutFunction get_in_out_func,
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GstV4l2SetInOutFunction set_in_out_func,
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GstV4l2UpdateFpsFunction update_fps_func);
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extern void
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gst_v4l2_object_destroy (GstV4l2Object ** v4l2object);
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extern void
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gst_v4l2_object_install_properties_helper (GObjectClass *gobject_class);
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extern gboolean
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gst_v4l2_object_set_property_helper (GstV4l2Object *v4l2object,
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guint prop_id, const GValue * value, GParamSpec * pspec);
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extern gboolean
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gst_v4l2_object_get_property_helper (GstV4l2Object *v4l2object,
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guint prop_id, GValue * value, GParamSpec * pspec);
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extern gboolean gst_v4l2_object_start (GstV4l2Object *v4l2object);
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extern gboolean gst_v4l2_object_stop (GstV4l2Object *v4l2object);
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extern const GList *
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gst_v4l2_probe_get_properties (GstPropertyProbe * probe);
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extern void
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gst_v4l2_probe_probe_property (GstPropertyProbe * probe,
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guint prop_id,
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const GParamSpec * pspec,
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GList ** klass_devices);
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extern gboolean
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gst_v4l2_probe_needs_probe (GstPropertyProbe * probe,
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guint prop_id,
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const GParamSpec * pspec,
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GList ** klass_devices);
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extern GValueArray *
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gst_v4l2_probe_get_values (GstPropertyProbe * probe,
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guint prop_id,
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const GParamSpec * pspec,
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GList ** klass_devices);
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#define GST_IMPLEMENT_V4L2_PROBE_METHODS(Type_Class, interface_as_function) \
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\
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static void \
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interface_as_function ## _probe_probe_property (GstPropertyProbe * probe, \
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guint prop_id, \
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const GParamSpec * pspec) \
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{ \
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Type_Class *this_class = (Type_Class*) probe; \
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gst_v4l2_probe_probe_property (probe, prop_id, pspec, \
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&this_class->v4l2_class_devices); \
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} \
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\
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static gboolean \
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interface_as_function ## _probe_needs_probe (GstPropertyProbe * probe, \
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guint prop_id, \
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const GParamSpec * pspec) \
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{ \
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Type_Class *this_class = (Type_Class*) probe; \
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return gst_v4l2_probe_needs_probe (probe, prop_id, pspec, \
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&this_class->v4l2_class_devices); \
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} \
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\
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static GValueArray * \
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interface_as_function ## _probe_get_values (GstPropertyProbe * probe, \
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guint prop_id, \
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const GParamSpec * pspec) \
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{ \
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Type_Class *this_class = (Type_Class*) probe; \
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return gst_v4l2_probe_get_values (probe, prop_id, pspec, \
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&this_class->v4l2_class_devices); \
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} \
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\
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static void \
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interface_as_function ## _property_probe_interface_init (GstPropertyProbeInterface * iface) \
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{ \
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iface->get_properties = gst_v4l2_probe_get_properties; \
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iface->probe_property = interface_as_function ## _probe_probe_property; \
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iface->needs_probe = interface_as_function ## _probe_needs_probe; \
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iface->get_values = interface_as_function ## _probe_get_values; \
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}
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G_END_DECLS
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#endif /* __GST_V4L2_OBJECT_H__ */
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