3 * Copyright (C) 2001-2002 Ronald Bultje <rbultje@ronald.bitfreak.net>
4 * 2006 Edgard Lima <edgard.lima@indt.org.br>
6 * gstv4l2object.h: base class for V4L2 elements
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.
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.
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.
24 #ifndef __GST_V4L2_OBJECT_H__
25 #define __GST_V4L2_OBJECT_H__
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.
39 #include <sys/ioctl.h>
40 #include <sys/types.h>
42 #include <linux/types.h>
45 #include <linux/videodev2.h>
47 #include <sys/videodev2.h>
51 #include <gst/base/gstpushsrc.h>
52 #include <gst/controller/gstcontroller.h>
54 #include <gst/interfaces/propertyprobe.h>
57 /* size of v4l2 buffer pool in streaming case */
58 #define GST_V4L2_MAX_BUFFERS 16
59 #define GST_V4L2_MIN_BUFFERS 1
61 /* max frame width/height */
62 #define GST_V4L2_MAX_SIZE (1<<15) /* 2^15 == 32768 */
68 #define GST_V4L2_OBJECT(obj) (GstV4l2Object *)(obj)
70 typedef struct _GstV4l2Object GstV4l2Object;
71 typedef struct _GstV4l2ObjectClassHelper GstV4l2ObjectClassHelper;
72 typedef struct _GstV4l2Xv GstV4l2Xv;
74 typedef gboolean (*GstV4l2GetInOutFunction) (GstV4l2Object * v4l2object, gint * input);
75 typedef gboolean (*GstV4l2SetInOutFunction) (GstV4l2Object * v4l2object, gint input);
76 typedef gboolean (*GstV4l2UpdateFpsFunction) (GstV4l2Object * v4l2object);
78 struct _GstV4l2Object {
81 /* the video device */
84 /* the video-device's file descriptor */
87 gboolean can_poll_device;
89 /* the video buffer (mmap()'ed) */
92 enum v4l2_buf_type type; /* V4L2_BUF_TYPE_VIDEO_CAPTURE, V4L2_BUF_TYPE_VIDEO_OUTPUT */
94 /* the current format */
95 struct v4l2_format format;
97 /* the video device's capabilities */
98 struct v4l2_capability vcap;
100 /* the video device's window properties */
101 struct v4l2_window vwin;
103 /* some more info about the current input's capabilities */
104 struct v4l2_input vinput;
107 GSList *formats; /* list of available capture formats */
123 GstV4l2GetInOutFunction get_in_out_func;
124 GstV4l2SetInOutFunction set_in_out_func;
125 GstV4l2UpdateFpsFunction update_fps_func;
128 struct _GstV4l2ObjectClassHelper {
133 GType gst_v4l2_object_get_type (void);
135 #define V4L2_STD_OBJECT_PROPS \
147 GstV4l2Object * gst_v4l2_object_new (GstElement * element,
148 enum v4l2_buf_type type,
149 const char *default_device,
150 GstV4l2GetInOutFunction get_in_out_func,
151 GstV4l2SetInOutFunction set_in_out_func,
152 GstV4l2UpdateFpsFunction update_fps_func);
153 void gst_v4l2_object_destroy (GstV4l2Object * v4l2object);
157 void gst_v4l2_object_install_properties_helper (GObjectClass *gobject_class, const char *default_device);
159 gboolean gst_v4l2_object_set_property_helper (GstV4l2Object *v4l2object,
160 guint prop_id, const GValue * value,
162 gboolean gst_v4l2_object_get_property_helper (GstV4l2Object *v4l2object,
163 guint prop_id, GValue * value,
165 /* starting/stopping */
166 gboolean gst_v4l2_object_start (GstV4l2Object *v4l2object);
167 gboolean gst_v4l2_object_stop (GstV4l2Object *v4l2object);
170 const GList* gst_v4l2_probe_get_properties (GstPropertyProbe * probe);
172 void gst_v4l2_probe_probe_property (GstPropertyProbe * probe, guint prop_id,
173 const GParamSpec * pspec,
174 GList ** klass_devices);
175 gboolean gst_v4l2_probe_needs_probe (GstPropertyProbe * probe, guint prop_id,
176 const GParamSpec * pspec,
177 GList ** klass_devices);
178 GValueArray* gst_v4l2_probe_get_values (GstPropertyProbe * probe, guint prop_id,
179 const GParamSpec * pspec,
180 GList ** klass_devices);
182 GstCaps* gst_v4l2_object_probe_caps_for_format (GstV4l2Object *v4l2object, guint32 pixelformat,
183 const GstStructure * template);
185 gboolean gst_v4l2_object_get_caps_info (GstV4l2Object *v4l2object, GstCaps *caps,
186 struct v4l2_fmtdesc **format, gint *w, gint *h,
187 gboolean * interlaced, guint *fps_n, guint *fps_d, guint *size);
190 GSList* gst_v4l2_object_get_format_list (GstV4l2Object *v4l2object);
192 GstCaps* gst_v4l2_object_get_all_caps (void);
194 GstStructure* gst_v4l2_object_v4l2fourcc_to_structure (guint32 fourcc);
196 gboolean gst_v4l2_object_set_format (GstV4l2Object *v4l2object, guint32 pixelformat, guint32 width, guint32 height, gboolean interlaced);
198 gboolean gst_v4l2_object_start_streaming (GstV4l2Object *v4l2object);
199 gboolean gst_v4l2_object_stop_streaming (GstV4l2Object *v4l2object);
202 #define GST_IMPLEMENT_V4L2_PROBE_METHODS(Type_Class, interface_as_function) \
205 interface_as_function ## _probe_probe_property (GstPropertyProbe * probe, \
207 const GParamSpec * pspec) \
209 Type_Class *this_class = (Type_Class*) G_OBJECT_GET_CLASS (probe); \
210 gst_v4l2_probe_probe_property (probe, prop_id, pspec, \
211 &this_class->v4l2_class_devices); \
215 interface_as_function ## _probe_needs_probe (GstPropertyProbe * probe, \
217 const GParamSpec * pspec) \
219 Type_Class *this_class = (Type_Class*) G_OBJECT_GET_CLASS (probe); \
220 return gst_v4l2_probe_needs_probe (probe, prop_id, pspec, \
221 &this_class->v4l2_class_devices); \
224 static GValueArray * \
225 interface_as_function ## _probe_get_values (GstPropertyProbe * probe, \
227 const GParamSpec * pspec) \
229 Type_Class *this_class = (Type_Class*) G_OBJECT_GET_CLASS (probe); \
230 return gst_v4l2_probe_get_values (probe, prop_id, pspec, \
231 &this_class->v4l2_class_devices); \
235 interface_as_function ## _property_probe_interface_init (GstPropertyProbeInterface * iface) \
237 iface->get_properties = gst_v4l2_probe_get_properties; \
238 iface->probe_property = interface_as_function ## _probe_probe_property; \
239 iface->needs_probe = interface_as_function ## _probe_needs_probe; \
240 iface->get_values = interface_as_function ## _probe_get_values; \
245 #endif /* __GST_V4L2_OBJECT_H__ */