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
    GstV4l2GetInOutFunction get_in_out_func,
252
253
    GstV4l2SetInOutFunction set_in_out_func,
    GstV4l2UpdateFpsFunction update_fps_func)
254
255
256
257
258
259
260
261
262
263
264
{
  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;
265
  v4l2object->update_fps_func = update_fps_func;
266
267
268

  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
  g_return_if_fail (v4l2object != NULL);
284

285
286
287
288
  if (v4l2object->videodev)
    g_free (v4l2object->videodev);

  g_free (v4l2object);
289
290
291
}

gboolean
292
gst_v4l2_object_set_property_helper (GstV4l2Object * v4l2object,
293
294
295
296
    guint prop_id, const GValue * value, GParamSpec * pspec)
{
  switch (prop_id) {
    case PROP_DEVICE:
Wim Taymans's avatar
Wim Taymans committed
297
      g_free (v4l2object->videodev);
298
      v4l2object->videodev = g_value_dup_string (value);
299
      break;
300
#if 0
301
    case PROP_NORM:
302
303
304
      if (GST_V4L2_IS_OPEN (v4l2object)) {
        GstTuner *tuner = GST_TUNER (v4l2object->element);
        GstTunerNorm *norm = gst_tuner_find_norm_by_name (tuner,
305
            (gchar *) g_value_get_string (value));
306
307
308
309
310
311
312

        if (norm) {
          /* like gst_tuner_set_norm (tuner, norm)
             without g_object_notify */
          gst_v4l2_tuner_set_norm (v4l2object, norm);
        }
      } else {
313
314
        g_free (v4l2object->norm);
        v4l2object->norm = g_value_dup_string (value);
315
316
      }
      break;
317
    case PROP_CHANNEL:
318
319
320
      if (GST_V4L2_IS_OPEN (v4l2object)) {
        GstTuner *tuner = GST_TUNER (v4l2object->element);
        GstTunerChannel *channel = gst_tuner_find_channel_by_name (tuner,
321
            (gchar *) g_value_get_string (value));
322
323
324
325
326
327
328

        if (channel) {
          /* like gst_tuner_set_channel (tuner, channel)
             without g_object_notify */
          gst_v4l2_tuner_set_channel (v4l2object, channel);
        }
      } else {
329
330
        g_free (v4l2object->channel);
        v4l2object->channel = g_value_dup_string (value);
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
      }
      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;
350
#endif
351
352
353
354
355
356
357
358
359
    default:
      return FALSE;
      break;
  }
  return TRUE;
}


gboolean
360
gst_v4l2_object_get_property_helper (GstV4l2Object * v4l2object,
361
362
363
364
365
366
367
368
    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:
    {
369
      const guchar *new = NULL;
370

371
      if (GST_V4L2_IS_OPEN (v4l2object)) {
372
        new = v4l2object->vcap.card;
373
      } else if (gst_v4l2_open (v4l2object)) {
374
        new = v4l2object->vcap.card;
375
376
        gst_v4l2_close (v4l2object);
      }
377
      g_value_set_string (value, (gchar *) new);
378
379
380
381
382
383
384
385
386
387
      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
388
389
390
            V4L2_CAP_VIDEO_OVERLAY |
            V4L2_CAP_VBI_CAPTURE |
            V4L2_CAP_VBI_OUTPUT | V4L2_CAP_TUNER | V4L2_CAP_AUDIO);
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
      }
      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);

409
410
  if (v4l2object->norm)
    norm = gst_tuner_find_norm_by_name (tuner, v4l2object->norm);
411
412
413
414
415
416
  if (norm) {
    gst_tuner_set_norm (tuner, norm);
  } else {
    norm =
        GST_TUNER_NORM (gst_tuner_get_norm (GST_TUNER (v4l2object->element)));
    if (norm) {
417
418
      g_free (v4l2object->norm);
      v4l2object->norm = g_strdup (norm->label);
419
420
421
422
      gst_tuner_norm_changed (tuner, norm);
    }
  }

423
424
  if (v4l2object->channel)
    channel = gst_tuner_find_channel_by_name (tuner, v4l2object->channel);
425
426
427
428
429
430
  if (channel) {
    gst_tuner_set_channel (tuner, channel);
  } else {
    channel =
        GST_TUNER_CHANNEL (gst_tuner_get_channel (GST_TUNER (v4l2object->
                element)));
431
432
433
434
435
    if (channel) {
      g_free (v4l2object->channel);
      v4l2object->channel = g_strdup (channel->label);
      gst_tuner_channel_changed (tuner, channel);
    }
436
437
  }

438
439
  if (channel
      && GST_TUNER_CHANNEL_HAS_FLAG (channel, GST_TUNER_CHANNEL_FREQUENCY)) {
440
441
442
443
444
445
446
447
448
449
450
451
452
453
    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;
}