gstv4l2object.c 12.7 KB
Newer Older
1
2
/* GStreamer
 *
3
 * Copyright (C) 2001-2002 Ronald Bultje <rbultje@ronald.bitfreak.net>
4
5
6
 *               2006 Edgard Lima <edgard.lima@indt.org.br>
 *
 * gstv4l2object.c: base class for V4L2 elements
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
 *
 * 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
 * USA. 
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>
#include <string.h>

#include "v4l2_calls.h"
#include "gstv4l2tuner.h"
33
#if 0                           /* overlay is still not implemented #ifdef HAVE_XVIDEO */
34
35
36
37
#include "gstv4l2xoverlay.h"
#endif
#include "gstv4l2colorbalance.h"

38
39
40
#define DEFAULT_PROP_DEVICE		"/dev/video0"
#define DEFAULT_PROP_DEVICE_NAME 	NULL
#define DEFAULT_PROP_FLAGS              0
41
42
#define DEFAULT_PROP_NORM               NULL
#define DEFAULT_PROP_CHANNEL            NULL
43
44
#define DEFAULT_PROP_FREQUENCY          0

Stefan Kost's avatar
Stefan Kost committed
45
46
47
48
49
50
51
enum
{
  PROP_0,
  V4L2_STD_OBJECT_PROPS,
};

const GList *
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
gst_v4l2_probe_get_properties (GstPropertyProbe * probe)
{
  GObjectClass *klass = G_OBJECT_GET_CLASS (probe);
  static GList *list = NULL;

  /* well, not perfect, but better than no locking at all.
   * In the worst case we leak a list node, so who cares? */
  GST_CLASS_LOCK (GST_OBJECT_CLASS (klass));

  if (!list) {
    list = g_list_append (NULL, g_object_class_find_property (klass, "device"));
  }

  GST_CLASS_UNLOCK (GST_OBJECT_CLASS (klass));

  return list;
}

static gboolean
gst_v4l2_class_probe_devices (GstElementClass * klass, gboolean check,
    GList ** klass_devices)
{
  static gboolean init = FALSE;
  static GList *devices = NULL;

  if (!init && !check) {
Stefan Kost's avatar
Stefan Kost committed
78
    const gchar *dev_base[] = { "/dev/video", "/dev/v4l2/video", NULL };
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
    gint base, n, fd;

    while (devices) {
      GList *item = devices;
      gchar *device = item->data;

      devices = g_list_remove (devices, item);
      g_free (device);
    }

    /*
     * detect /dev entries 
     */
    for (n = 0; n < 64; n++) {
      for (base = 0; dev_base[base] != NULL; base++) {
        struct stat s;
        gchar *device = g_strdup_printf ("%s%d",
            dev_base[base],
            n);

        /*
         * does the /dev/ entry exist at all? 
         */
        if (stat (device, &s) == 0) {
          /*
           * yes: is a device attached? 
           */
          if (S_ISCHR (s.st_mode)) {

            if ((fd = open (device, O_RDWR | O_NONBLOCK)) > 0 || errno == EBUSY) {
              if (fd > 0)
                close (fd);

              devices = g_list_append (devices, device);
              break;
            }
          }
        }
        g_free (device);
      }
    }
    init = TRUE;
  }

  *klass_devices = devices;

  return init;
}

void
gst_v4l2_probe_probe_property (GstPropertyProbe * probe,
    guint prop_id, const GParamSpec * pspec, GList ** klass_devices)
{
  GstElementClass *klass = GST_ELEMENT_GET_CLASS (probe);

  switch (prop_id) {
    case PROP_DEVICE:
      gst_v4l2_class_probe_devices (klass, FALSE, klass_devices);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (probe, prop_id, pspec);
      break;
  }
}

gboolean
gst_v4l2_probe_needs_probe (GstPropertyProbe * probe,
    guint prop_id, const GParamSpec * pspec, GList ** klass_devices)
{
  GstElementClass *klass = GST_ELEMENT_GET_CLASS (probe);
  gboolean ret = FALSE;

  switch (prop_id) {
    case PROP_DEVICE:
      ret = !gst_v4l2_class_probe_devices (klass, TRUE, klass_devices);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (probe, prop_id, pspec);
      break;
  }
  return ret;
}

static GValueArray *
gst_v4l2_class_list_devices (GstElementClass * klass, GList ** klass_devices)
{
  GValueArray *array;
  GValue value = { 0 };
  GList *item;

  if (!*klass_devices)
    return NULL;

  array = g_value_array_new (g_list_length (*klass_devices));
  item = *klass_devices;
  g_value_init (&value, G_TYPE_STRING);
  while (item) {
    gchar *device = item->data;

    g_value_set_string (&value, device);
    g_value_array_append (array, &value);

    item = item->next;
  }
  g_value_unset (&value);

  return array;
}

GValueArray *
gst_v4l2_probe_get_values (GstPropertyProbe * probe,
    guint prop_id, const GParamSpec * pspec, GList ** klass_devices)
{
  GstElementClass *klass = GST_ELEMENT_GET_CLASS (probe);
  GValueArray *array = NULL;

  switch (prop_id) {
    case PROP_DEVICE:
      array = gst_v4l2_class_list_devices (klass, klass_devices);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (probe, prop_id, pspec);
      break;
  }

  return array;
}

#define GST_TYPE_V4L2_DEVICE_FLAGS (gst_v4l2_device_get_type ())
GType
gst_v4l2_device_get_type (void)
{
  static GType v4l2_device_type = 0;

  if (v4l2_device_type == 0) {
    static const GFlagsValue values[] = {
215
216
217
218
219
220
221
222
223
      {V4L2_CAP_VIDEO_CAPTURE, "Device supports video capture", "capture"},
      {V4L2_CAP_VIDEO_OUTPUT, "Device supports video playback", "output"},
      {V4L2_CAP_VIDEO_OVERLAY, "Device supports video overlay", "overlay"},

      {V4L2_CAP_VBI_CAPTURE, "Device supports the VBI capture", "vbi-capture"},
      {V4L2_CAP_VBI_OUTPUT, "Device supports the VBI output", "vbi-output"},

      {V4L2_CAP_TUNER, "Device has a tuner or modulator", "tuner"},
      {V4L2_CAP_AUDIO, "Device has audio inputs or outputs", "audio"},
224
225
226
227
228
229
230
231
232
233
234
235

      {0, NULL, NULL}
    };

    v4l2_device_type =
        g_flags_register_static ("GstV4l2DeviceTypeFlags", values);
  }

  return v4l2_device_type;
}

void
236
gst_v4l2_object_install_properties_helper (GObjectClass * gobject_class)
237
{
238
239
240
241
242
243
244
245
246
  g_object_class_install_property (gobject_class, PROP_DEVICE,
      g_param_spec_string ("device", "Device", "Device location",
          DEFAULT_PROP_DEVICE, G_PARAM_READWRITE));
  g_object_class_install_property (gobject_class, PROP_DEVICE_NAME,
      g_param_spec_string ("device-name", "Device name",
          "Name of the device", DEFAULT_PROP_DEVICE_NAME, G_PARAM_READABLE));
  g_object_class_install_property (gobject_class, PROP_FLAGS,
      g_param_spec_flags ("flags", "Flags", "Device type flags",
          GST_TYPE_V4L2_DEVICE_FLAGS, DEFAULT_PROP_FLAGS, G_PARAM_READABLE));
247
248
249
}

GstV4l2Object *
250
gst_v4l2_object_new (GstElement * element,
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
    GstV4l2GetInOutFunction get_in_out_func,
    GstV4l2SetInOutFunction set_in_out_func,
    GstV4l2UpdateFpsFunction update_fps_func)
{
  GstV4l2Object *v4l2object;

  /*
   * some default values 
   */
  v4l2object = g_new0 (GstV4l2Object, 1);

  v4l2object->element = element;
  v4l2object->get_in_out_func = get_in_out_func;
  v4l2object->set_in_out_func = set_in_out_func;
  v4l2object->update_fps_func = update_fps_func;

  v4l2object->video_fd = -1;
  v4l2object->buffer = NULL;
269
  v4l2object->videodev = g_strdup (DEFAULT_PROP_DEVICE);
270

271
272
  v4l2object->norms = NULL;
  v4l2object->channels = NULL;
273
274
275
276
277
278
279
280
  v4l2object->colors = NULL;

  v4l2object->xwindow_id = 0;

  return v4l2object;
}

void
281
gst_v4l2_object_destroy (GstV4l2Object ** v4l2object)
282
283
284
285
286
287
288
289
290
291
292
293
294
{
  if (*v4l2object) {
    if ((*v4l2object)->videodev) {
      g_free ((*v4l2object)->videodev);
      (*v4l2object)->videodev = NULL;
    }

    g_free (*v4l2object);
    *v4l2object = NULL;
  }
}

gboolean
295
gst_v4l2_object_set_property_helper (GstV4l2Object * v4l2object,
296
297
298
299
    guint prop_id, const GValue * value, GParamSpec * pspec)
{
  switch (prop_id) {
    case PROP_DEVICE:
Wim Taymans's avatar
Wim Taymans committed
300
      g_free (v4l2object->videodev);
301
      v4l2object->videodev = g_value_dup_string (value);
302
      break;
303
#if 0
304
    case PROP_NORM:
305
306
307
      if (GST_V4L2_IS_OPEN (v4l2object)) {
        GstTuner *tuner = GST_TUNER (v4l2object->element);
        GstTunerNorm *norm = gst_tuner_find_norm_by_name (tuner,
308
            (gchar *) g_value_get_string (value));
309
310
311
312
313
314
315

        if (norm) {
          /* like gst_tuner_set_norm (tuner, norm)
             without g_object_notify */
          gst_v4l2_tuner_set_norm (v4l2object, norm);
        }
      } else {
316
317
        g_free (v4l2object->norm);
        v4l2object->norm = g_value_dup_string (value);
318
319
      }
      break;
320
    case PROP_CHANNEL:
321
322
323
      if (GST_V4L2_IS_OPEN (v4l2object)) {
        GstTuner *tuner = GST_TUNER (v4l2object->element);
        GstTunerChannel *channel = gst_tuner_find_channel_by_name (tuner,
324
            (gchar *) g_value_get_string (value));
325
326
327
328
329
330
331

        if (channel) {
          /* like gst_tuner_set_channel (tuner, channel)
             without g_object_notify */
          gst_v4l2_tuner_set_channel (v4l2object, channel);
        }
      } else {
332
333
        g_free (v4l2object->channel);
        v4l2object->channel = g_value_dup_string (value);
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
      }
      break;
    case PROP_FREQUENCY:
      if (GST_V4L2_IS_OPEN (v4l2object)) {
        GstTuner *tuner = GST_TUNER (v4l2object->element);
        GstTunerChannel *channel = gst_tuner_get_channel (tuner);

        if (channel &&
            GST_TUNER_CHANNEL_HAS_FLAG (channel, GST_TUNER_CHANNEL_FREQUENCY)) {
          /* like
             gst_tuner_set_frequency (tuner, channel, g_value_get_ulong (value))
             without g_object_notify */
          gst_v4l2_tuner_set_frequency (v4l2object, channel,
              g_value_get_ulong (value));
        }
      } else {
        v4l2object->frequency = g_value_get_ulong (value);
      }
      break;
353
#endif
354
355
356
357
358
359
360
361
362
    default:
      return FALSE;
      break;
  }
  return TRUE;
}


gboolean
363
gst_v4l2_object_get_property_helper (GstV4l2Object * v4l2object,
364
365
366
367
368
369
370
371
    guint prop_id, GValue * value, GParamSpec * pspec)
{
  switch (prop_id) {
    case PROP_DEVICE:
      g_value_set_string (value, v4l2object->videodev);
      break;
    case PROP_DEVICE_NAME:
    {
372
      const guchar *new = NULL;
373

374
      if (GST_V4L2_IS_OPEN (v4l2object)) {
375
        new = v4l2object->vcap.card;
376
      } else if (gst_v4l2_open (v4l2object)) {
377
        new = v4l2object->vcap.card;
378
379
        gst_v4l2_close (v4l2object);
      }
380
      g_value_set_string (value, (gchar *) new);
381
382
383
384
385
386
387
388
389
390
      break;
    }
    case PROP_FLAGS:
    {
      guint flags = 0;

      if (GST_V4L2_IS_OPEN (v4l2object)) {
        flags |= v4l2object->vcap.capabilities &
            (V4L2_CAP_VIDEO_CAPTURE |
            V4L2_CAP_VIDEO_OUTPUT |
Edgard Lima's avatar
Edgard Lima committed
391
392
393
            V4L2_CAP_VIDEO_OVERLAY |
            V4L2_CAP_VBI_CAPTURE |
            V4L2_CAP_VBI_OUTPUT | V4L2_CAP_TUNER | V4L2_CAP_AUDIO);
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
      }
      g_value_set_flags (value, flags);
      break;
    }
    default:
      return FALSE;
      break;
  }
  return TRUE;
}

static void
gst_v4l2_set_defaults (GstV4l2Object * v4l2object)
{
  GstTunerNorm *norm = NULL;
  GstTunerChannel *channel = NULL;
  GstTuner *tuner = GST_TUNER (v4l2object->element);

412
413
  if (v4l2object->norm)
    norm = gst_tuner_find_norm_by_name (tuner, v4l2object->norm);
414
415
416
417
418
419
  if (norm) {
    gst_tuner_set_norm (tuner, norm);
  } else {
    norm =
        GST_TUNER_NORM (gst_tuner_get_norm (GST_TUNER (v4l2object->element)));
    if (norm) {
420
421
      g_free (v4l2object->norm);
      v4l2object->norm = g_strdup (norm->label);
422
423
424
425
      gst_tuner_norm_changed (tuner, norm);
    }
  }

426
427
  if (v4l2object->channel)
    channel = gst_tuner_find_channel_by_name (tuner, v4l2object->channel);
428
429
430
431
432
433
  if (channel) {
    gst_tuner_set_channel (tuner, channel);
  } else {
    channel =
        GST_TUNER_CHANNEL (gst_tuner_get_channel (GST_TUNER (v4l2object->
                element)));
434
435
    g_free (v4l2object->channel);
    v4l2object->channel = g_strdup (channel->label);
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
    gst_tuner_channel_changed (tuner, channel);
  }

  if (GST_TUNER_CHANNEL_HAS_FLAG (channel, GST_TUNER_CHANNEL_FREQUENCY)) {
    if (v4l2object->frequency != 0) {
      gst_tuner_set_frequency (tuner, channel, v4l2object->frequency);
    } else {
      v4l2object->frequency = gst_tuner_get_frequency (tuner, channel);
      if (v4l2object->frequency == 0) {
        /* guess */
        gst_tuner_set_frequency (tuner, channel, 1000);
      } else {
      }
    }
  }
}

gboolean
454
gst_v4l2_object_start (GstV4l2Object * v4l2object)
455
456
457
458
459
460
{
  if (gst_v4l2_open (v4l2object))
    gst_v4l2_set_defaults (v4l2object);
  else
    return FALSE;

461
#if 0                           /* overlay is still not implemented #ifdef HAVE_XVIDEO */
462
463
464
465
466
467
468
  gst_v4l2_xoverlay_start (v4l2object);
#endif

  return TRUE;
}

gboolean
469
gst_v4l2_object_stop (GstV4l2Object * v4l2object)
470
{
471
#if 0                           /* overlay is still not implemented #ifdef HAVE_XVIDEO */
472
473
474
475
476
477
478
479
  gst_v4l2_xoverlay_stop (v4l2object);
#endif

  if (!gst_v4l2_close (v4l2object))
    return FALSE;

  return TRUE;
}