gstv4l2object.c 14 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
/* FIXME norm, channel, frequency are part of the tuner interface, so they
   should be removed from the properties
249 250 251 252 253 254
  g_object_class_install_property (gobject_class, PROP_NORM,
      g_param_spec_string ("norm", "Norm", "Standard norm to use",
          DEFAULT_PROP_NORM, G_PARAM_READWRITE));
  g_object_class_install_property (gobject_class, PROP_CHANNEL,
      g_param_spec_string ("channel", "Channel",
          "Input/output channel to switch to", DEFAULT_PROP_CHANNEL,
255 256 257 258 259
          G_PARAM_READWRITE));
  g_object_class_install_property (gobject_class, PROP_FREQUENCY,
      g_param_spec_ulong ("frequency", "Frequency",
          "Frequency to tune to (in Hz)", 0, G_MAXULONG, DEFAULT_PROP_FREQUENCY,
          G_PARAM_READWRITE));
260
*/
261 262 263
}

GstV4l2Object *
264
gst_v4l2_object_new (GstElement * element,
265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282
    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;
283
  v4l2object->videodev = g_strdup (DEFAULT_PROP_DEVICE);
284

285 286
  v4l2object->norms = NULL;
  v4l2object->channels = NULL;
287 288 289 290 291 292 293 294
  v4l2object->colors = NULL;

  v4l2object->xwindow_id = 0;

  return v4l2object;
}

void
295
gst_v4l2_object_destroy (GstV4l2Object ** v4l2object)
296 297 298 299 300 301 302 303 304 305 306 307 308
{
  if (*v4l2object) {
    if ((*v4l2object)->videodev) {
      g_free ((*v4l2object)->videodev);
      (*v4l2object)->videodev = NULL;
    }

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

gboolean
309
gst_v4l2_object_set_property_helper (GstV4l2Object * v4l2object,
310 311 312 313
    guint prop_id, const GValue * value, GParamSpec * pspec)
{
  switch (prop_id) {
    case PROP_DEVICE:
Wim Taymans's avatar
Wim Taymans committed
314
      g_free (v4l2object->videodev);
315
      v4l2object->videodev = g_value_dup_string (value);
316
      break;
317
    case PROP_NORM:
318 319 320
      if (GST_V4L2_IS_OPEN (v4l2object)) {
        GstTuner *tuner = GST_TUNER (v4l2object->element);
        GstTunerNorm *norm = gst_tuner_find_norm_by_name (tuner,
321
            (gchar *) g_value_get_string (value));
322 323 324 325 326 327 328

        if (norm) {
          /* like gst_tuner_set_norm (tuner, norm)
             without g_object_notify */
          gst_v4l2_tuner_set_norm (v4l2object, norm);
        }
      } else {
329 330
        g_free (v4l2object->norm);
        v4l2object->norm = g_value_dup_string (value);
331 332
      }
      break;
333
    case PROP_CHANNEL:
334 335 336
      if (GST_V4L2_IS_OPEN (v4l2object)) {
        GstTuner *tuner = GST_TUNER (v4l2object->element);
        GstTunerChannel *channel = gst_tuner_find_channel_by_name (tuner,
337
            (gchar *) g_value_get_string (value));
338 339 340 341 342 343 344

        if (channel) {
          /* like gst_tuner_set_channel (tuner, channel)
             without g_object_notify */
          gst_v4l2_tuner_set_channel (v4l2object, channel);
        }
      } else {
345 346
        g_free (v4l2object->channel);
        v4l2object->channel = g_value_dup_string (value);
347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374
      }
      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;
    default:
      return FALSE;
      break;
  }
  return TRUE;
}


gboolean
375
gst_v4l2_object_get_property_helper (GstV4l2Object * v4l2object,
376 377 378 379 380 381 382 383
    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:
    {
384
      const guchar *new = NULL;
385

386
      if (GST_V4L2_IS_OPEN (v4l2object)) {
387
        new = v4l2object->vcap.card;
388
      } else if (gst_v4l2_open (v4l2object)) {
389
        new = v4l2object->vcap.card;
390 391
        gst_v4l2_close (v4l2object);
      }
392
      g_value_set_string (value, (gchar *) new);
393 394 395 396 397 398 399 400 401 402
      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
403 404 405
            V4L2_CAP_VIDEO_OVERLAY |
            V4L2_CAP_VBI_CAPTURE |
            V4L2_CAP_VBI_OUTPUT | V4L2_CAP_TUNER | V4L2_CAP_AUDIO);
406 407 408 409
      }
      g_value_set_flags (value, flags);
      break;
    }
410 411
    case PROP_NORM:
      g_value_set_string (value, v4l2object->norm);
412
      break;
413 414
    case PROP_CHANNEL:
      g_value_set_string (value, v4l2object->channel);
415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432
      break;
    case PROP_FREQUENCY:
      g_value_set_ulong (value, v4l2object->frequency);
      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);

433 434
  if (v4l2object->norm)
    norm = gst_tuner_find_norm_by_name (tuner, v4l2object->norm);
435 436 437 438 439 440
  if (norm) {
    gst_tuner_set_norm (tuner, norm);
  } else {
    norm =
        GST_TUNER_NORM (gst_tuner_get_norm (GST_TUNER (v4l2object->element)));
    if (norm) {
441 442
      g_free (v4l2object->norm);
      v4l2object->norm = g_strdup (norm->label);
443
      gst_tuner_norm_changed (tuner, norm);
444
/* FIXME: remove
445
      g_object_notify (G_OBJECT (v4l2object->element), "norm");
446
*/
447 448 449
    }
  }

450 451
  if (v4l2object->channel)
    channel = gst_tuner_find_channel_by_name (tuner, v4l2object->channel);
452 453 454 455 456 457
  if (channel) {
    gst_tuner_set_channel (tuner, channel);
  } else {
    channel =
        GST_TUNER_CHANNEL (gst_tuner_get_channel (GST_TUNER (v4l2object->
                element)));
458 459
    g_free (v4l2object->channel);
    v4l2object->channel = g_strdup (channel->label);
460
    gst_tuner_channel_changed (tuner, channel);
461
/* FIXME: remove
462
    g_object_notify (G_OBJECT (v4l2object->element), "channel");
463
*/
464 465 466 467 468 469 470 471 472 473 474
  }

  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 {
475
/* FIXME: remove
476
        g_object_notify (G_OBJECT (v4l2object->element), "frequency");
477
*/
478 479 480 481 482 483
      }
    }
  }
}

gboolean
484
gst_v4l2_object_start (GstV4l2Object * v4l2object)
485 486 487 488 489 490
{
  if (gst_v4l2_open (v4l2object))
    gst_v4l2_set_defaults (v4l2object);
  else
    return FALSE;

491
#if 0                           /* overlay is still not implemented #ifdef HAVE_XVIDEO */
492 493 494 495 496 497 498
  gst_v4l2_xoverlay_start (v4l2object);
#endif

  return TRUE;
}

gboolean
499
gst_v4l2_object_stop (GstV4l2Object * v4l2object)
500
{
501
#if 0                           /* overlay is still not implemented #ifdef HAVE_XVIDEO */
502 503 504 505 506 507 508 509
  gst_v4l2_xoverlay_stop (v4l2object);
#endif

  if (!gst_v4l2_close (v4l2object))
    return FALSE;

  return TRUE;
}