sys/v4l/gstv4lmjpegsrc.c

   1 /* G-Streamer hardware MJPEG video source plugin
   2  * Copyright (C) 2001-2002 Ronald Bultje <rbultje@ronald.bitfreak.net>
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Library General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Library General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Library General Public
  15  * License along with this library; if not, write to the
  16  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17  * Boston, MA 02111-1307, USA.
  18  */
  19
  20 #include <string.h>
  21 #include "v4lmjpegsrc_calls.h"
  22
  23 static GstElementDetails gst_v4lmjpegsrc_details = {
  24   "Video (video4linux/MJPEG) Source",
  25   "Source/Video",
  26   "Reads MJPEG-encoded frames from a zoran MJPEG/video4linux device",
  27   VERSION,
  28   "Ronald Bultje <rbultje@ronald.bitfreak.net>",
  29   "(C) 2001",
  30 };
  31
  32 /* V4lMjpegSrc signals and args */
  33 enum {
  34   /* FILL ME */
  35   LAST_SIGNAL
  36 };
  37
  38 /* arguments */
  39 enum {
  40   ARG_0,
  41   ARG_X_OFFSET,
  42   ARG_Y_OFFSET,
  43   ARG_F_WIDTH,
  44   ARG_F_HEIGHT,
  45   ARG_H_DECIMATION,
  46   ARG_V_DECIMATION,
  47   ARG_WIDTH,
  48   ARG_HEIGHT,
  49   ARG_QUALITY,
  50   ARG_NUMBUFS,
  51   ARG_BUFSIZE
  52 };
  53
  54
  55 /* init functions */
  56 static void                  gst_v4lmjpegsrc_class_init   (GstV4lMjpegSrcClass *klass);
  57 static void                  gst_v4lmjpegsrc_init         (GstV4lMjpegSrc *v4lmjpegsrc);
  58
  59 /* pad/buffer functions */
  60 static GstPadConnectReturn   gst_v4lmjpegsrc_srcconnect   (GstPad         *pad,
  61                                                            GstCaps        *caps);
  62 static GstBuffer*            gst_v4lmjpegsrc_get          (GstPad         *pad);
  63
  64 /* get/set params */
  65 static void                  gst_v4lmjpegsrc_set_property (GObject        *object,
  66                                                            guint          prop_id,
  67                                                            const GValue   *value,
  68                                                            GParamSpec     *pspec);
  69 static void                  gst_v4lmjpegsrc_get_property (GObject        *object,
  70                                                            guint          prop_id,
  71                                                            GValue         *value,
  72                                                            GParamSpec     *pspec);
  73
  74 /* state handling */
  75 static GstElementStateReturn gst_v4lmjpegsrc_change_state (GstElement     *element);
  76
  77 /* bufferpool functions */
  78 static GstBuffer*            gst_v4lmjpegsrc_buffer_new   (GstBufferPool  *pool,
  79                                                            gint64         location,
  80                                                            gint           size,
  81                                                            gpointer       user_data);
  82 static GstBuffer*            gst_v4lmjpegsrc_buffer_copy  (GstBuffer      *srcbuf);
  83 static void                  gst_v4lmjpegsrc_buffer_free  (GstBuffer      *buf);
  84
  85
  86 static GstCaps *capslist = NULL;
  87 static GstPadTemplate *src_template;
  88
  89 static GstElementClass *parent_class = NULL;
  90 /*static guint gst_v4lmjpegsrc_signals[LAST_SIGNAL] = { 0 }; */
  91
  92
  93 GType
  94 gst_v4lmjpegsrc_get_type (void)
  95 {
  96   static GType v4lmjpegsrc_type = 0;
  97
  98   if (!v4lmjpegsrc_type) {
  99     static const GTypeInfo v4lmjpegsrc_info = {
 100       sizeof(GstV4lMjpegSrcClass),
 101       NULL,
 102       NULL,
 103       (GClassInitFunc)gst_v4lmjpegsrc_class_init,
 104       NULL,
 105       NULL,
 106       sizeof(GstV4lMjpegSrc),
 107       0,
 108       (GInstanceInitFunc)gst_v4lmjpegsrc_init,
 109       NULL
 110     };
 111     v4lmjpegsrc_type = g_type_register_static(GST_TYPE_V4LELEMENT, "GstV4lMjpegSrc", &v4lmjpegsrc_info, 0);
 112   }
 113   return v4lmjpegsrc_type;
 114 }
 115
 116
 117 static void
 118 gst_v4lmjpegsrc_class_init (GstV4lMjpegSrcClass *klass)
 119 {
 120   GObjectClass *gobject_class;
 121   GstElementClass *gstelement_class;
 122
 123   gobject_class = (GObjectClass*)klass;
 124   gstelement_class = (GstElementClass*)klass;
 125
 126   parent_class = g_type_class_ref(GST_TYPE_V4LELEMENT);
 127
 128   g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_X_OFFSET,
 129     g_param_spec_int("x_offset","x_offset","x_offset",
 130     G_MININT,G_MAXINT,0,G_PARAM_WRITABLE));
 131   g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_Y_OFFSET,
 132     g_param_spec_int("y_offset","y_offset","y_offset",
 133     G_MININT,G_MAXINT,0,G_PARAM_WRITABLE));
 134   g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_F_WIDTH,
 135     g_param_spec_int("frame_width","frame_width","frame_width",
 136     G_MININT,G_MAXINT,0,G_PARAM_WRITABLE));
 137   g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_F_HEIGHT,
 138     g_param_spec_int("frame_height","frame_height","frame_height",
 139     G_MININT,G_MAXINT,0,G_PARAM_WRITABLE));
 140
 141   g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_H_DECIMATION,
 142     g_param_spec_int("h_decimation","h_decimation","h_decimation",
 143     G_MININT,G_MAXINT,0,G_PARAM_WRITABLE));
 144   g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_V_DECIMATION,
 145     g_param_spec_int("v_decimation","v_decimation","v_decimation",
 146     G_MININT,G_MAXINT,0,G_PARAM_WRITABLE));
 147
 148   g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_WIDTH,
 149     g_param_spec_int("width","width","width",
 150     G_MININT,G_MAXINT,0,G_PARAM_READABLE));
 151   g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_HEIGHT,
 152     g_param_spec_int("height","height","height",
 153     G_MININT,G_MAXINT,0,G_PARAM_READABLE));
 154
 155   g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_QUALITY,
 156     g_param_spec_int("quality","quality","quality",
 157     G_MININT,G_MAXINT,0,G_PARAM_WRITABLE));
 158
 159   g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_NUMBUFS,
 160     g_param_spec_int("num_buffers","num_buffers","num_buffers",
 161     G_MININT,G_MAXINT,0,G_PARAM_READWRITE));
 162   g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_BUFSIZE,
 163     g_param_spec_int("buffer_size","buffer_size","buffer_size",
 164     G_MININT,G_MAXINT,0,G_PARAM_READWRITE));
 165
 166   gobject_class->set_property = gst_v4lmjpegsrc_set_property;
 167   gobject_class->get_property = gst_v4lmjpegsrc_get_property;
 168
 169   gstelement_class->change_state = gst_v4lmjpegsrc_change_state;
 170 }
 171
 172
 173 static void
 174 gst_v4lmjpegsrc_init (GstV4lMjpegSrc *v4lmjpegsrc)
 175 {
 176   v4lmjpegsrc->srcpad = gst_pad_new_from_template (src_template, "src");
 177   gst_element_add_pad(GST_ELEMENT(v4lmjpegsrc), v4lmjpegsrc->srcpad);
 178
 179   gst_pad_set_get_function (v4lmjpegsrc->srcpad, gst_v4lmjpegsrc_get);
 180   gst_pad_set_connect_function (v4lmjpegsrc->srcpad, gst_v4lmjpegsrc_srcconnect);
 181
 182   v4lmjpegsrc->bufferpool = gst_buffer_pool_new();
 183   gst_buffer_pool_set_buffer_new_function(v4lmjpegsrc->bufferpool, gst_v4lmjpegsrc_buffer_new);
 184   gst_buffer_pool_set_buffer_copy_function(v4lmjpegsrc->bufferpool, gst_v4lmjpegsrc_buffer_copy);
 185   gst_buffer_pool_set_buffer_free_function(v4lmjpegsrc->bufferpool, gst_v4lmjpegsrc_buffer_free);
 186   gst_buffer_pool_set_user_data(v4lmjpegsrc->bufferpool, v4lmjpegsrc);
 187
 188   v4lmjpegsrc->frame_width = 0;
 189   v4lmjpegsrc->frame_height = 0;
 190   v4lmjpegsrc->x_offset = -1;
 191   v4lmjpegsrc->y_offset = -1;
 192
 193   v4lmjpegsrc->horizontal_decimation = 4;
 194   v4lmjpegsrc->vertical_decimation = 4;
 195
 196   v4lmjpegsrc->end_width = 0;
 197   v4lmjpegsrc->end_height = 0;
 198
 199   v4lmjpegsrc->quality = 50;
 200
 201   v4lmjpegsrc->numbufs = 64;
 202   v4lmjpegsrc->bufsize = 256;
 203
 204   v4lmjpegsrc->capslist = capslist;
 205 }
 206
 207
 208 static GstPadConnectReturn
 209 gst_v4lmjpegsrc_srcconnect (GstPad  *pad,
 210                             GstCaps *caps)
 211 {
 212   GstV4lMjpegSrc *v4lmjpegsrc;
 213
 214   v4lmjpegsrc = GST_V4LMJPEGSRC (gst_pad_get_parent (pad));
 215
 216   /* we will try_set_caps() with the actual size (wxh) when we know it */
 217
 218   return GST_PAD_CONNECT_OK;
 219 }
 220
 221
 222 static GstBuffer*
 223 gst_v4lmjpegsrc_get (GstPad *pad)
 224 {
 225   GstV4lMjpegSrc *v4lmjpegsrc;
 226   GstBuffer *buf;
 227   gint num;
 228
 229   g_return_val_if_fail (pad != NULL, NULL);
 230
 231   v4lmjpegsrc = GST_V4LMJPEGSRC (gst_pad_get_parent (pad));
 232
 233   buf = gst_buffer_new_from_pool(v4lmjpegsrc->bufferpool, 0, 0);
 234   if (!buf)
 235   {
 236     gst_element_error(GST_ELEMENT(v4lmjpegsrc),
 237       "Failed to create a new GstBuffer");
 238     return NULL;
 239   }
 240
 241   /* grab a frame from the device */
 242   if (!gst_v4lmjpegsrc_grab_frame(v4lmjpegsrc, &num, &(GST_BUFFER_SIZE(buf))))
 243     return NULL;
 244   GST_BUFFER_DATA(buf) = gst_v4lmjpegsrc_get_buffer(v4lmjpegsrc, num);
 245   buf->timestamp = v4lmjpegsrc->bsync.timestamp.tv_sec * 1000000000 +
 246     v4lmjpegsrc->bsync.timestamp.tv_usec * 1000;
 247
 248   return buf;
 249 }
 250
 251
 252 static void
 253 gst_v4lmjpegsrc_set_property (GObject      *object,
 254                               guint        prop_id,
 255                               const GValue *value,
 256                               GParamSpec   *pspec)
 257 {
 258   GstV4lMjpegSrc *v4lmjpegsrc;
 259
 260   g_return_if_fail(GST_IS_V4LMJPEGSRC(object));
 261   v4lmjpegsrc = GST_V4LMJPEGSRC(object);
 262
 263   switch (prop_id) {
 264     case ARG_X_OFFSET:
 265       v4lmjpegsrc->x_offset = g_value_get_int(value);
 266       break;
 267     case ARG_Y_OFFSET:
 268       v4lmjpegsrc->y_offset = g_value_get_int(value);
 269       break;
 270     case ARG_F_WIDTH:
 271       v4lmjpegsrc->frame_width = g_value_get_int(value);
 272       break;
 273     case ARG_F_HEIGHT:
 274       v4lmjpegsrc->frame_height = g_value_get_int(value);
 275       break;
 276     case ARG_H_DECIMATION:
 277       v4lmjpegsrc->horizontal_decimation = g_value_get_int(value);
 278       break;
 279     case ARG_V_DECIMATION:
 280       v4lmjpegsrc->vertical_decimation = g_value_get_int(value);
 281       break;
 282     case ARG_QUALITY:
 283       v4lmjpegsrc->quality = g_value_get_int(value);
 284       break;
 285     case ARG_NUMBUFS:
 286       v4lmjpegsrc->numbufs = g_value_get_int(value);
 287       break;
 288     case ARG_BUFSIZE:
 289       v4lmjpegsrc->bufsize = g_value_get_int(value);
 290       break;
 291     default:
 292       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 293       break;
 294   }
 295 }
 296
 297
 298 static void
 299 gst_v4lmjpegsrc_get_property (GObject    *object,
 300                               guint      prop_id,
 301                               GValue     *value,
 302                               GParamSpec *pspec)
 303 {
 304   GstV4lMjpegSrc *v4lmjpegsrc;
 305
 306   g_return_if_fail(GST_IS_V4LMJPEGSRC(object));
 307   v4lmjpegsrc = GST_V4LMJPEGSRC(object);
 308
 309   switch (prop_id) {
 310     case ARG_WIDTH:
 311       g_value_set_int(value, v4lmjpegsrc->end_width);
 312       break;
 313     case ARG_HEIGHT:
 314       g_value_set_int(value, v4lmjpegsrc->end_height);
 315       break;
 316     case ARG_X_OFFSET:
 317       g_value_set_int(value, v4lmjpegsrc->x_offset);
 318       break;
 319     case ARG_Y_OFFSET:
 320       g_value_set_int(value, v4lmjpegsrc->y_offset);
 321       break;
 322     case ARG_F_WIDTH:
 323       g_value_set_int(value, v4lmjpegsrc->frame_width);
 324       break;
 325     case ARG_F_HEIGHT:
 326       g_value_set_int(value, v4lmjpegsrc->frame_height);
 327       break;
 328     case ARG_H_DECIMATION:
 329       g_value_set_int(value, v4lmjpegsrc->horizontal_decimation);
 330       break;
 331     case ARG_V_DECIMATION:
 332       g_value_set_int(value, v4lmjpegsrc->vertical_decimation);
 333       break;
 334     case ARG_QUALITY:
 335       g_value_set_int(value, v4lmjpegsrc->quality);
 336       break;
 337     case ARG_NUMBUFS:
 338       g_value_set_int(value, v4lmjpegsrc->breq.count);
 339       break;
 340     case ARG_BUFSIZE:
 341       g_value_set_int(value, v4lmjpegsrc->breq.size);
 342       break;
 343     default:
 344       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 345       break;
 346   }
 347 }
 348
 349
 350 static GstElementStateReturn
 351 gst_v4lmjpegsrc_change_state (GstElement *element)
 352 {
 353   GstV4lMjpegSrc *v4lmjpegsrc;
 354   GstElementStateReturn parent_value;
 355   GstCaps *caps;
 356
 357   g_return_val_if_fail(GST_IS_V4LMJPEGSRC(element), GST_STATE_FAILURE);
 358
 359   v4lmjpegsrc = GST_V4LMJPEGSRC(element);
 360
 361   switch (GST_STATE_TRANSITION(element)) {
 362     case GST_STATE_READY_TO_PAUSED:
 363       /* set buffer info */
 364       if (!gst_v4lmjpegsrc_set_buffer(v4lmjpegsrc, v4lmjpegsrc->numbufs, v4lmjpegsrc->bufsize))
 365         return GST_STATE_FAILURE;
 366       /* set capture parameters and mmap the buffers */
 367       if (!v4lmjpegsrc->frame_width && !v4lmjpegsrc->frame_height &&
 368            v4lmjpegsrc->x_offset < 0 && v4lmjpegsrc->y_offset < 0 &&
 369            v4lmjpegsrc->horizontal_decimation == v4lmjpegsrc->vertical_decimation)
 370       {
 371         if (!gst_v4lmjpegsrc_set_capture(v4lmjpegsrc,
 372             v4lmjpegsrc->horizontal_decimation, v4lmjpegsrc->quality))
 373           return GST_STATE_FAILURE;
 374       }
 375       else
 376       {
 377         if (!gst_v4lmjpegsrc_set_capture_m(v4lmjpegsrc,
 378              v4lmjpegsrc->x_offset, v4lmjpegsrc->y_offset,
 379              v4lmjpegsrc->frame_width, v4lmjpegsrc->frame_height,
 380              v4lmjpegsrc->horizontal_decimation, v4lmjpegsrc->vertical_decimation,
 381              v4lmjpegsrc->quality))
 382           return GST_STATE_FAILURE;
 383       }
 384       /* we now have an actual width/height - *set it* */
 385       caps = gst_caps_new("v4lmjpegsrc_caps",
 386                           "video/jpeg",
 387                           gst_props_new(
 388                             "width",  GST_PROPS_INT(v4lmjpegsrc->end_width),
 389                             "height", GST_PROPS_INT(v4lmjpegsrc->end_height),
 390                             NULL       ) );
 391       if (!gst_pad_try_set_caps(v4lmjpegsrc->srcpad, caps))
 392       {
 393         gst_element_error(GST_ELEMENT(v4lmjpegsrc),
 394           "Failed to set new caps");
 395         return GST_STATE_FAILURE;
 396       }
 397       if (!gst_v4lmjpegsrc_capture_init(v4lmjpegsrc))
 398         return GST_STATE_FAILURE;
 399       break;
 400     case GST_STATE_PAUSED_TO_PLAYING:
 401       /* queue all buffer, start streaming capture */
 402       if (!gst_v4lmjpegsrc_capture_start(v4lmjpegsrc))
 403         return GST_STATE_FAILURE;
 404       break;
 405     case GST_STATE_PLAYING_TO_PAUSED:
 406       /* de-queue all queued buffers */
 407       if (!gst_v4lmjpegsrc_capture_stop(v4lmjpegsrc))
 408         return GST_STATE_FAILURE;
 409       break;
 410     case GST_STATE_PAUSED_TO_READY:
 411       /* stop capturing, unmap all buffers */
 412       if (!gst_v4lmjpegsrc_capture_deinit(v4lmjpegsrc))
 413         return GST_STATE_FAILURE;
 414       break;
 415   }
 416
 417   if (GST_ELEMENT_CLASS (parent_class)->change_state) {
 418     parent_value = GST_ELEMENT_CLASS (parent_class)->change_state (element);
 419   } else {
 420     parent_value = GST_STATE_FAILURE;
 421   }
 422
 423   if (GST_STATE_TRANSITION(element) == GST_STATE_NULL_TO_READY)
 424   {
 425     /* do autodetection if no input/norm is selected yet */
 426     if ((GST_V4LELEMENT(v4lmjpegsrc)->norm < VIDEO_MODE_PAL ||
 427          GST_V4LELEMENT(v4lmjpegsrc)->norm == VIDEO_MODE_AUTO) ||
 428         (GST_V4LELEMENT(v4lmjpegsrc)->channel < 0 ||
 429          GST_V4LELEMENT(v4lmjpegsrc)->channel == V4L_MJPEG_INPUT_AUTO))
 430     {
 431       gint norm, input;
 432
 433       if (GST_V4LELEMENT(v4lmjpegsrc)->norm < 0)
 434         norm = VIDEO_MODE_AUTO;
 435       else
 436         norm = GST_V4LELEMENT(v4lmjpegsrc)->norm;
 437
 438       if (GST_V4LELEMENT(v4lmjpegsrc)->channel < 0)
 439         input = V4L_MJPEG_INPUT_AUTO;
 440       else
 441         input = GST_V4LELEMENT(v4lmjpegsrc)->channel;
 442
 443       if (!gst_v4lmjpegsrc_set_input_norm(v4lmjpegsrc, input, norm))
 444         return GST_STATE_FAILURE;
 445     }
 446   }
 447
 448   if (GST_ELEMENT_CLASS (parent_class)->change_state)
 449     return parent_value;
 450
 451   return GST_STATE_SUCCESS;
 452 }
 453
 454
 455 static GstBuffer*
 456 gst_v4lmjpegsrc_buffer_new (GstBufferPool *pool,
 457                             gint64        location,
 458                             gint          size,
 459                             gpointer      user_data)
 460 {
 461   GstBuffer *buffer;
 462
 463   buffer = gst_buffer_new();
 464   if (!buffer) return NULL;
 465   buffer->pool_private = user_data;
 466
 467   /* TODO: add interlacing info to buffer as metadata */
 468
 469   return buffer;
 470 }
 471
 472
 473 static GstBuffer*
 474 gst_v4lmjpegsrc_buffer_copy (GstBuffer *srcbuf)
 475 {
 476   GstBuffer *buffer;
 477
 478   buffer = gst_buffer_new();
 479   if (!buffer) return NULL;
 480   GST_BUFFER_DATA(buffer) = g_malloc(GST_BUFFER_SIZE(srcbuf));
 481   if (!GST_BUFFER_DATA(buffer)) return NULL;
 482   GST_BUFFER_SIZE(buffer) = GST_BUFFER_SIZE(srcbuf);
 483   memcpy(GST_BUFFER_DATA(buffer), GST_BUFFER_DATA(srcbuf), GST_BUFFER_SIZE(srcbuf));
 484   GST_BUFFER_TIMESTAMP(buffer) = GST_BUFFER_TIMESTAMP(srcbuf);
 485
 486   return buffer;
 487 }
 488
 489
 490 static void
 491 gst_v4lmjpegsrc_buffer_free (GstBuffer *buf)
 492 {
 493   GstV4lMjpegSrc *v4lmjpegsrc = buf->pool_private;
 494   int n;
 495
 496   for (n=0;n<v4lmjpegsrc->breq.count;n++)
 497     if (GST_BUFFER_DATA(buf) == gst_v4lmjpegsrc_get_buffer(v4lmjpegsrc, n))
 498     {
 499       gst_v4lmjpegsrc_requeue_frame(v4lmjpegsrc, n);
 500       return;
 501     }
 502
 503   gst_element_error(GST_ELEMENT(v4lmjpegsrc),
 504     "Couldn't find the buffer");
 505 }
 506
 507
 508 static gboolean
 509 plugin_init (GModule *module, GstPlugin *plugin)
 510 {
 511   GstElementFactory *factory;
 512   GstCaps *caps;
 513
 514   /* create an elementfactory for the v4lmjpegsrcparse element */
 515   factory = gst_element_factory_new("v4lmjpegsrc",GST_TYPE_V4LMJPEGSRC,
 516                                    &gst_v4lmjpegsrc_details);
 517   g_return_val_if_fail(factory != NULL, FALSE);
 518
 519   caps = gst_caps_new ("v4lmjpegsrc_caps",
 520                        "video/jpeg",
 521                        gst_props_new (
 522                           "width",  GST_PROPS_INT_RANGE (0, G_MAXINT),
 523                           "height", GST_PROPS_INT_RANGE (0, G_MAXINT),
 524                           NULL       )
 525                       );
 526   capslist = gst_caps_append(capslist, caps);
 527
 528   src_template = gst_pad_template_new (
 529                   "src",
 530                   GST_PAD_SRC,
 531                   GST_PAD_ALWAYS,
 532                   capslist, NULL);
 533
 534   gst_element_factory_add_pad_template (factory, src_template);
 535
 536   gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (factory));
 537
 538   return TRUE;
 539 }
 540
 541
 542 GstPluginDesc plugin_desc = {
 543   GST_VERSION_MAJOR,
 544   GST_VERSION_MINOR,
 545   "v4lmjpegsrc",
 546   plugin_init
 547 };