src/empathy-video-src.c

   1 /*
   2  * empathy-gst-video-src.c - Source for EmpathyGstVideoSrc
   3  * Copyright (C) 2008 Collabora Ltd.
   4  * @author Sjoerd Simons <sjoerd.simons@collabora.co.uk>
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  19  */
  20
  21 #include "config.h"
  22
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25
  26 #include <gst/interfaces/colorbalance.h>
  27
  28 #define DEBUG_FLAG EMPATHY_DEBUG_VOIP
  29 #include <libempathy/empathy-debug.h>
  30
  31 #include "empathy-video-src.h"
  32
  33 G_DEFINE_TYPE(EmpathyGstVideoSrc, empathy_video_src, GST_TYPE_BIN)
  34
  35 /* Keep in sync with EmpathyGstVideoSrcChannel */
  36 static const gchar *channel_names[NR_EMPATHY_GST_VIDEO_SRC_CHANNELS] = {
  37   "contrast", "brightness", "gamma" };
  38
  39 /* signal enum */
  40 #if 0
  41 enum
  42 {
  43     LAST_SIGNAL
  44 };
  45
  46 static guint signals[LAST_SIGNAL] = {0};
  47 #endif
  48
  49 /* private structure */
  50 typedef struct _EmpathyGstVideoSrcPrivate EmpathyGstVideoSrcPrivate;
  51
  52 struct _EmpathyGstVideoSrcPrivate
  53 {
  54   gboolean dispose_has_run;
  55   GstElement *src;
  56   /* Element implementing a ColorBalance interface */
  57   GstElement *balance;
  58   /* Elements for resolution and framerate adjustment */
  59   GstElement *capsfilter;
  60   GstElement *videorate;
  61   guint width;
  62   guint height;
  63   guint framerate;
  64 };
  65
  66 #define EMPATHY_GST_VIDEO_SRC_GET_PRIVATE(o) \
  67   (G_TYPE_INSTANCE_GET_PRIVATE ((o), EMPATHY_TYPE_GST_VIDEO_SRC, \
  68     EmpathyGstVideoSrcPrivate))
  69 /**
  70  * empathy_gst_add_to_bin - create a new gst element, add to bin and link it.
  71  * @bin - bin to add the new element to.
  72  * @src - src element for the new element (may be NULL).
  73  * @name - name of the factory for the new element
  74  *
  75  * Returns: The newly created element ot %NULL on failure
  76  */
  77 static GstElement *
  78 empathy_gst_add_to_bin (GstBin *bin,
  79   GstElement *src,
  80   const gchar *factoryname)
  81 {
  82   GstElement *ret;
  83
  84   if ((ret = gst_element_factory_make (factoryname, NULL)) == NULL)
  85   {
  86     g_message ("Element factory \"%s\" not found.", factoryname);
  87     goto error;
  88   }
  89
  90   if (!gst_bin_add (bin, ret))
  91   {
  92     g_warning ("Couldn't add \"%s\" to bin.", factoryname);
  93     goto error;
  94   }
  95
  96   /* do not link if src == NULL, just exit here */
  97   if (src == NULL)
  98     return ret;
  99
 100   if (!gst_element_link (src, ret))
 101   {
 102     g_warning ("Failed to link \"%s\".", factoryname);
 103     gst_bin_remove (bin, ret);
 104     goto error;
 105   }
 106
 107   return ret;
 108
 109 error:
 110   if (ret != NULL)
 111     gst_object_unref (ret);
 112   return NULL;
 113 }
 114
 115 static gboolean
 116 empathy_video_src_drop_eos (GstPad *pad, GstEvent *event, gpointer user_data)
 117 {
 118   return GST_EVENT_TYPE (event) != GST_EVENT_EOS;
 119 }
 120
 121 static void
 122 empathy_video_src_init (EmpathyGstVideoSrc *obj)
 123 {
 124   EmpathyGstVideoSrcPrivate *priv = EMPATHY_GST_VIDEO_SRC_GET_PRIVATE (obj);
 125   GstElement *element, *element_back;
 126   GstPad *ghost, *src;
 127   GstCaps *caps;
 128   gchar *str;
 129
 130   /* allocate caps here, so we can update it by optional elements */
 131   caps = gst_caps_new_simple ("video/x-raw-yuv",
 132     "width", G_TYPE_INT, 320,
 133     "height", G_TYPE_INT, 240,
 134     NULL);
 135
 136   /* allocate any data required by the object here */
 137   if ((element = empathy_gst_add_to_bin (GST_BIN (obj),
 138       NULL, "v4l2src")) == NULL)
 139     g_error ("Couldn't add \"v4l2src\" (gst-plugins-good missing?)");
 140
 141   /* we need to save our source to priv->src */
 142   priv->src = element;
 143
 144   /* Drop EOS events, so that our sinks don't get confused when we restart the
 145    * source (triggering an EOS) */
 146   src = gst_element_get_static_pad (element, "src");
 147   gst_pad_add_event_probe (src, G_CALLBACK (empathy_video_src_drop_eos), NULL);
 148   gst_object_unref (src);
 149
 150   /* videorate with the required properties optional as it needs a currently
 151    * unreleased gst-plugins-base 0.10.36 */
 152   element_back = element;
 153   element = empathy_gst_add_to_bin (GST_BIN (obj), element, "videorate");
 154
 155   if (element != NULL && g_object_class_find_property (
 156       G_OBJECT_GET_CLASS (element), "max-rate") != NULL)
 157     {
 158       priv->videorate = element;
 159       g_object_set (G_OBJECT (element),
 160         "drop-only", TRUE,
 161         "average-period", GST_SECOND/2,
 162         NULL);
 163     }
 164   else
 165     {
 166       g_message ("videorate missing or doesn't have max-rate property, not"
 167         "doing dynamic framerate changes (Needs gst-plugins-base >= 0.10.36)");
 168       /* Refcount owned by the bin */
 169       gst_bin_remove (GST_BIN (obj), element);
 170       element = element_back;
 171     }
 172
 173   gst_caps_set_simple (caps,
 174       "framerate", GST_TYPE_FRACTION_RANGE, 1, 1, 30, 1,
 175       NULL);
 176
 177   str = gst_caps_to_string (caps);
 178   DEBUG ("Current video src caps are : %s", str);
 179   g_free (str);
 180
 181   if ((element = empathy_gst_add_to_bin (GST_BIN (obj),
 182       element, "ffmpegcolorspace")) == NULL)
 183     g_error ("Failed to add \"ffmpegcolorspace\" (gst-plugins-base missing?)");
 184
 185   if ((element = empathy_gst_add_to_bin (GST_BIN (obj),
 186       element, "videoscale")) == NULL)
 187     g_error ("Failed to add \"videoscale\", (gst-plugins-base missing?)");
 188
 189   if ((element = empathy_gst_add_to_bin (GST_BIN (obj),
 190       element, "capsfilter")) == NULL)
 191     g_error (
 192       "Failed to add \"capsfilter\" (gstreamer core elements missing?)");
 193
 194   priv->capsfilter = element;
 195   g_object_set (G_OBJECT (element), "caps", caps, NULL);
 196
 197
 198   /* optionally add postproc_tmpnoise to improve the performance of encoders */
 199   element_back = element;
 200   if ((element = empathy_gst_add_to_bin (GST_BIN (obj),
 201       element, "postproc_tmpnoise")) == NULL)
 202     {
 203       g_message ("Failed to add \"postproc_tmpnoise\" (gst-ffmpeg missing?)");
 204       element = element_back;
 205     }
 206
 207   src = gst_element_get_static_pad (element, "src");
 208   g_assert (src != NULL);
 209
 210   ghost = gst_ghost_pad_new ("src", src);
 211   if (ghost == NULL)
 212     g_error ("Unable to create ghost pad for the videosrc");
 213
 214   if (!gst_element_add_pad (GST_ELEMENT (obj), ghost))
 215     g_error ("pad with the same name already existed or "
 216             "the pad already had another parent.");
 217
 218   gst_object_unref (G_OBJECT (src));
 219 }
 220
 221 static void empathy_video_src_dispose (GObject *object);
 222 static void empathy_video_src_finalize (GObject *object);
 223
 224 static void
 225 empathy_video_src_class_init (EmpathyGstVideoSrcClass *empathy_video_src_class)
 226 {
 227   GObjectClass *object_class = G_OBJECT_CLASS (empathy_video_src_class);
 228
 229   g_type_class_add_private (empathy_video_src_class,
 230     sizeof (EmpathyGstVideoSrcPrivate));
 231
 232   object_class->dispose = empathy_video_src_dispose;
 233   object_class->finalize = empathy_video_src_finalize;
 234 }
 235
 236 void
 237 empathy_video_src_dispose (GObject *object)
 238 {
 239   EmpathyGstVideoSrc *self = EMPATHY_GST_VIDEO_SRC (object);
 240   EmpathyGstVideoSrcPrivate *priv = EMPATHY_GST_VIDEO_SRC_GET_PRIVATE (self);
 241
 242   if (priv->dispose_has_run)
 243     return;
 244
 245   priv->dispose_has_run = TRUE;
 246
 247   /* release any references held by the object here */
 248
 249   if (G_OBJECT_CLASS (empathy_video_src_parent_class)->dispose)
 250     G_OBJECT_CLASS (empathy_video_src_parent_class)->dispose (object);
 251 }
 252
 253 void
 254 empathy_video_src_finalize (GObject *object)
 255 {
 256   //EmpathyGstVideoSrc *self = EMPATHY_GST_VIDEO_SRC (object);
 257   //EmpathyGstVideoSrcPrivate *priv = EMPATHY_GST_VIDEO_SRC_GET_PRIVATE (self);
 258
 259   /* free any data held directly by the object here */
 260
 261   G_OBJECT_CLASS (empathy_video_src_parent_class)->finalize (object);
 262 }
 263
 264 GstElement *
 265 empathy_video_src_new (void)
 266 {
 267   static gboolean registered = FALSE;
 268
 269   if (!registered) {
 270     if (!gst_element_register (NULL, "empathyvideosrc",
 271             GST_RANK_NONE, EMPATHY_TYPE_GST_VIDEO_SRC))
 272       return NULL;
 273     registered = TRUE;
 274   }
 275   return gst_element_factory_make ("empathyvideosrc", NULL);
 276 }
 277
 278 static GstColorBalance *
 279 dup_color_balance (GstElement *src)
 280 {
 281   GstElement *color;
 282
 283   /* Find something supporting GstColorBalance */
 284   color = gst_bin_get_by_interface (GST_BIN (src), GST_TYPE_COLOR_BALANCE);
 285
 286   if (color == NULL)
 287     return NULL;
 288
 289   /* colorbalance is wrapped by GstImplementsInterface, we
 290    * need to check if it is actually supported for this instance
 291    * in its current state before trying to use it */
 292   if (!GST_IS_COLOR_BALANCE (color))
 293     {
 294       g_object_unref (color);
 295       return NULL;
 296     }
 297
 298   return GST_COLOR_BALANCE (color);
 299 }
 300
 301 void
 302 empathy_video_src_set_channel (GstElement *src,
 303   EmpathyGstVideoSrcChannel channel, guint percent)
 304 {
 305   GstColorBalance *balance;
 306   const GList *channels;
 307   GList *l;
 308
 309   balance = dup_color_balance (src);
 310   if (balance == NULL)
 311     return;
 312
 313   channels = gst_color_balance_list_channels (balance);
 314
 315   for (l = (GList *) channels; l != NULL; l = g_list_next (l))
 316     {
 317       GstColorBalanceChannel *c = GST_COLOR_BALANCE_CHANNEL (l->data);
 318
 319       if (g_ascii_strcasecmp (c->label, channel_names[channel]) == 0)
 320         {
 321           gst_color_balance_set_value (balance, c,
 322             ((c->max_value - c->min_value) * percent)/100
 323               + c->min_value);
 324           break;
 325         }
 326     }
 327
 328   g_object_unref (balance);
 329 }
 330
 331 guint
 332 empathy_video_src_get_channel (GstElement *src,
 333   EmpathyGstVideoSrcChannel channel)
 334 {
 335   GstColorBalance *balance;
 336   const GList *channels;
 337   GList *l;
 338   guint percent = 0;
 339
 340   balance = dup_color_balance (src);
 341   if (balance == NULL)
 342     return percent;
 343
 344   channels = gst_color_balance_list_channels (balance);
 345
 346   for (l = (GList *) channels; l != NULL; l = g_list_next (l))
 347     {
 348       GstColorBalanceChannel *c = GST_COLOR_BALANCE_CHANNEL (l->data);
 349
 350       if (g_ascii_strcasecmp (c->label, channel_names[channel]) == 0)
 351         {
 352           percent =
 353             ((gst_color_balance_get_value (balance, c)
 354                 - c->min_value) * 100) /
 355               (c->max_value - c->min_value);
 356
 357           break;
 358         }
 359     }
 360
 361   g_object_unref (balance);
 362
 363   return percent;
 364 }
 365
 366
 367 guint
 368 empathy_video_src_get_supported_channels (GstElement *src)
 369 {
 370   GstColorBalance *balance;
 371   const GList *channels;
 372   GList *l;
 373   guint result = 0;
 374
 375   balance = dup_color_balance (src);
 376   if (balance == NULL)
 377     goto out;
 378
 379   channels = gst_color_balance_list_channels (balance);
 380
 381   for (l = (GList *) channels; l != NULL; l = g_list_next (l))
 382     {
 383       GstColorBalanceChannel *channel = GST_COLOR_BALANCE_CHANNEL (l->data);
 384       int i;
 385
 386       for (i = 0; i < NR_EMPATHY_GST_VIDEO_SRC_CHANNELS; i++)
 387         {
 388           if (g_ascii_strcasecmp (channel->label, channel_names[i]) == 0)
 389             {
 390               result |= (1 << i);
 391               break;
 392             }
 393         }
 394     }
 395
 396   g_object_unref (balance);
 397
 398 out:
 399   return result;
 400 }
 401
 402 void
 403 empathy_video_src_change_device (EmpathyGstVideoSrc *self,
 404     const gchar *device)
 405 {
 406   EmpathyGstVideoSrcPrivate *priv = EMPATHY_GST_VIDEO_SRC_GET_PRIVATE (self);
 407   GstState state;
 408
 409   gst_element_get_state (priv->src, &state, NULL, 0);
 410
 411   g_return_if_fail (state == GST_STATE_NULL);
 412
 413   g_object_set (priv->src, "device", device, NULL);
 414 }
 415
 416 gchar *
 417 empathy_video_src_dup_device (EmpathyGstVideoSrc *self)
 418 {
 419   EmpathyGstVideoSrcPrivate *priv = EMPATHY_GST_VIDEO_SRC_GET_PRIVATE (self);
 420   gchar *device;
 421
 422   g_object_get (priv->src, "device", &device, NULL);
 423
 424   return device;
 425 }
 426
 427 void
 428 empathy_video_src_set_framerate (GstElement *src,
 429     guint framerate)
 430 {
 431   EmpathyGstVideoSrcPrivate *priv = EMPATHY_GST_VIDEO_SRC_GET_PRIVATE (src);
 432
 433   if (priv->videorate)
 434     {
 435       g_object_set (G_OBJECT (priv->videorate), "max-rate", framerate, NULL);
 436     }
 437 }
 438
 439 void
 440 empathy_video_src_set_resolution (GstElement *src,
 441     guint width,
 442     guint height)
 443 {
 444   EmpathyGstVideoSrcPrivate *priv = EMPATHY_GST_VIDEO_SRC_GET_PRIVATE (src);
 445   GstCaps *caps;
 446   GstPad *srcpad, *peer;
 447
 448   g_return_if_fail (priv->capsfilter != NULL);
 449
 450   gst_element_set_locked_state (priv->src, TRUE);
 451   gst_element_set_state (priv->src, GST_STATE_NULL);
 452
 453   srcpad = gst_element_get_static_pad (priv->src, "src");
 454   peer = gst_pad_get_peer (srcpad);
 455
 456   /* Keep a ref as removing it from the bin will loose our reference */
 457   gst_object_ref (priv->src);
 458   gst_bin_remove (GST_BIN (src), priv->src);
 459
 460   g_object_get (priv->capsfilter, "caps", &caps, NULL);
 461   caps = gst_caps_make_writable (caps);
 462
 463   gst_caps_set_simple (caps,
 464       "width", G_TYPE_INT, width,
 465       "height", G_TYPE_INT, height,
 466       NULL);
 467
 468   g_object_set (priv->capsfilter, "caps", caps, NULL);
 469   gst_caps_unref (caps);
 470
 471   gst_bin_add (GST_BIN (src), priv->src);
 472   /* We as the bin own the source again, so drop the temporary ref */
 473   gst_object_unref (priv->src);
 474
 475   gst_pad_link (srcpad, peer);
 476
 477   gst_element_set_locked_state (priv->src, FALSE);
 478   gst_element_sync_state_with_parent (priv->src);
 479
 480   gst_object_unref (srcpad);
 481   gst_object_unref (peer);
 482 }