gstv4l2object.c 13.3 KB
Newer Older
1 2 3 4 5 6 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 33 34 35
/*
 * GStreamer gstv4l2object.c: base class for V4L2 elements
 * Copyright (C) 2001-2002 Ronald Bultje <rbultje@ronald.bitfreak.net>
 * Copyright (C) 2006 Edgard Lima <edgard.lima@indt.org.br>
 *
 * 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"
#ifdef HAVE_XVIDEO
#include "gstv4l2xoverlay.h"
#endif
#include "gstv4l2colorbalance.h"

Stefan Kost's avatar
Stefan Kost committed
36 37 38 39 40 41 42
enum
{
  PROP_0,
  V4L2_STD_OBJECT_PROPS,
};

const GList *
43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68
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
69
    const gchar *dev_base[] = { "/dev/video", "/dev/v4l2/video", NULL };
70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525
    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[] = {
      {V4L2_CAP_VIDEO_CAPTURE, "CAPTURE",
          "Device supports video capture"},
      {V4L2_CAP_VIDEO_OUTPUT, "PLAYBACK",
          "Device supports video playback"},
      {V4L2_CAP_VIDEO_OVERLAY, "OVERLAY",
          "Device supports video overlay"},

      {V4L2_CAP_VBI_CAPTURE, "VBI_CAPTURE",
          "Device supports the VBI capture"},
      {V4L2_CAP_VBI_OUTPUT, "VBI_OUTPUT",
          "Device supports the VBI output"},

      {V4L2_CAP_TUNER, "TUNER",
          "Device has a tuner or modulator"},
      {V4L2_CAP_AUDIO, "AUDIO",
          "Device has audio inputs or outputs"},

      {0, NULL, NULL}
    };

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

  return v4l2_device_type;
}

void
gst_v4l2object_install_properties_helper (GObjectClass * gobject_class)
{

  g_object_class_install_property
      (G_OBJECT_CLASS (gobject_class), PROP_DEVICE,
      g_param_spec_string ("device",
          "Device", "Device location", NULL, G_PARAM_READWRITE));
  g_object_class_install_property
      (G_OBJECT_CLASS (gobject_class),
      PROP_DEVICE_NAME,
      g_param_spec_string ("device_name",
          "Device name", "Name of the device", NULL, G_PARAM_READABLE));
  g_object_class_install_property
      (G_OBJECT_CLASS (gobject_class), PROP_FLAGS,
      g_param_spec_flags ("flags", "Flags",
          "Device type flags",
          GST_TYPE_V4L2_DEVICE_FLAGS, 0, G_PARAM_READABLE));
  g_object_class_install_property
      (gobject_class, PROP_STD,
      g_param_spec_string ("std", "std",
          "standard (norm) to use", NULL, G_PARAM_READWRITE));
  g_object_class_install_property
      (gobject_class, PROP_INPUT,
      g_param_spec_string ("input",
          "input",
          "input/output (channel) to switch to", NULL, 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, 0, G_PARAM_READWRITE));

}

GstV4l2Object *
gst_v4l2object_new (GstElement * element,
    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;
  v4l2object->videodev = g_strdup ("/dev/video0");

  v4l2object->stds = NULL;
  v4l2object->inputs = NULL;
  v4l2object->colors = NULL;

  v4l2object->xwindow_id = 0;

  return v4l2object;

}


void
gst_v4l2object_destroy (GstV4l2Object ** v4l2object)
{

  if (*v4l2object) {

    if ((*v4l2object)->videodev) {
      g_free ((*v4l2object)->videodev);
      (*v4l2object)->videodev = NULL;
    }

    g_free (*v4l2object);
    *v4l2object = NULL;

  }

}


gboolean
gst_v4l2object_set_property_helper (GstV4l2Object * v4l2object,
    guint prop_id, const GValue * value, GParamSpec * pspec)
{

  switch (prop_id) {
    case PROP_DEVICE:
      if (v4l2object->videodev)
        g_free (v4l2object->videodev);
      v4l2object->videodev = g_strdup (g_value_get_string (value));
      break;
    case PROP_STD:
      if (GST_V4L2_IS_OPEN (v4l2object)) {
        GstTuner *tuner = GST_TUNER (v4l2object->element);
        GstTunerNorm *norm = gst_tuner_find_norm_by_name (tuner,
            (gchar *)
            g_value_get_string (value));

        if (norm) {
          /* like gst_tuner_set_norm (tuner, norm)
             without g_object_notify */
          gst_v4l2_tuner_set_norm (v4l2object, norm);
        }
      } else {
        g_free (v4l2object->std);
        v4l2object->std = g_value_dup_string (value);
      }
      break;
    case PROP_INPUT:
      if (GST_V4L2_IS_OPEN (v4l2object)) {
        GstTuner *tuner = GST_TUNER (v4l2object->element);
        GstTunerChannel *channel = gst_tuner_find_channel_by_name (tuner,
            (gchar *)
            g_value_get_string (value));

        if (channel) {
          /* like gst_tuner_set_channel (tuner, channel)
             without g_object_notify */
          gst_v4l2_tuner_set_channel (v4l2object, channel);
        }
      } else {
        g_free (v4l2object->input);
        v4l2object->input = g_value_dup_string (value);
      }
      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
gst_v4l2object_get_property_helper (GstV4l2Object * v4l2object,
    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:
    {
      gchar *new = NULL;

      if (GST_V4L2_IS_OPEN (v4l2object))
        new = (gchar *) v4l2object->vcap.card;
      g_value_set_string (value, new);
      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 |
            V4L2_CAP_VIDEO_OVERLAY | V4L2_CAP_TUNER | V4L2_CAP_AUDIO);
        if (v4l2object->vcap.capabilities & V4L2_CAP_AUDIO)
          flags |= V4L2_FBUF_CAP_CHROMAKEY;
      }
      g_value_set_flags (value, flags);
      break;
    }
    case PROP_STD:
      g_value_set_string (value, v4l2object->std);
      break;
    case PROP_INPUT:
      g_value_set_string (value, v4l2object->input);
      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);

  if (v4l2object->std)
    norm = gst_tuner_find_norm_by_name (tuner, v4l2object->std);
  if (norm) {
    gst_tuner_set_norm (tuner, norm);
  } else {
    norm =
        GST_TUNER_NORM (gst_tuner_get_norm (GST_TUNER (v4l2object->element)));
    if (norm) {
      v4l2object->std = g_strdup (norm->label);
      gst_tuner_norm_changed (tuner, norm);
      g_object_notify (G_OBJECT (v4l2object->element), "std");
    }
  }

  if (v4l2object->input)
    channel = gst_tuner_find_channel_by_name (tuner, v4l2object->input);
  if (channel) {
    gst_tuner_set_channel (tuner, channel);
  } else {
    channel =
        GST_TUNER_CHANNEL (gst_tuner_get_channel (GST_TUNER (v4l2object->
                element)));
    v4l2object->input = g_strdup (channel->label);
    gst_tuner_channel_changed (tuner, channel);
    g_object_notify (G_OBJECT (v4l2object->element), "input");
  }

  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 {
        g_object_notify (G_OBJECT (v4l2object->element), "frequency");
      }
    }
  }
}


gboolean
gst_v4l2object_start (GstV4l2Object * v4l2object)
{
  if (gst_v4l2_open (v4l2object))
    gst_v4l2_set_defaults (v4l2object);
  else
    return FALSE;


#ifdef HAVE_XVIDEO
  gst_v4l2_xoverlay_start (v4l2object);
#endif

  return TRUE;
}

gboolean
gst_v4l2object_stop (GstV4l2Object * v4l2object)
{

#ifdef HAVE_XVIDEO
  gst_v4l2_xoverlay_stop (v4l2object);
#endif

  if (!gst_v4l2_close (v4l2object))
    return FALSE;

  return TRUE;
}