src/modules/gstreamer/emotion_sink.c

   1 #include <glib.h>
   2 #include <gst/gst.h>
   3 #include <gst/video/video.h>
   4 #include <gst/video/gstvideosink.h>
   5
   6 #include <Ecore.h>
   7
   8 #include "emotion_gstreamer.h"
   9
  10 static GstStaticPadTemplate sinktemplate = GST_STATIC_PAD_TEMPLATE("sink",
  11                                                                    GST_PAD_SINK, GST_PAD_ALWAYS,
  12                                                                    GST_STATIC_CAPS(GST_VIDEO_CAPS_BGRx ";" GST_VIDEO_CAPS_BGR ";" GST_VIDEO_CAPS_BGRA ";" GST_VIDEO_CAPS_YUV("{I420,YV12}")));
  13
  14
  15 GST_DEBUG_CATEGORY_STATIC(evas_video_sink_debug);
  16 #define GST_CAT_DEFAULT evas_video_sink_debug
  17
  18 enum {
  19   REPAINT_REQUESTED,
  20   LAST_SIGNAL
  21 };
  22
  23 enum {
  24   PROP_0,
  25   PROP_EVAS_OBJECT,
  26   PROP_WIDTH,
  27   PROP_HEIGHT,
  28   PROP_LAST,
  29 };
  30
  31 static guint evas_video_sink_signals[LAST_SIGNAL] = { 0, };
  32
  33 struct _EvasVideoSinkPrivate {
  34    Evas_Object *o;
  35    Ecore_Pipe *p;
  36
  37    int width;
  38    int height;
  39    GstVideoFormat format;
  40
  41    GMutex* buffer_mutex;
  42    GCond* data_cond;
  43
  44    GstBuffer *last_buffer; /* We need to keep a copy of the last inserted buffer as evas doesn't copy YUV data around */
  45
  46    // If this is TRUE all processing should finish ASAP
  47    // This is necessary because there could be a race between
  48    // unlock() and render(), where unlock() wins, signals the
  49    // GCond, then render() tries to render a frame although
  50    // everything else isn't running anymore. This will lead
  51    // to deadlocks because render() holds the stream lock.
  52    //
  53    // Protected by the buffer mutex
  54    Eina_Bool unlocked : 1;
  55    Eina_Bool preroll : 1;
  56    Eina_Bool update_size : 1;
  57 };
  58
  59 #define _do_init(bla)                                   \
  60   GST_DEBUG_CATEGORY_INIT(evas_video_sink_debug,        \
  61                           "emotion-sink",               \
  62                           0,                            \
  63                           "emotion video sink")
  64
  65 GST_BOILERPLATE_FULL(EvasVideoSink,
  66                      evas_video_sink,
  67                      GstVideoSink,
  68                      GST_TYPE_VIDEO_SINK,
  69                      _do_init);
  70
  71
  72 static void unlock_buffer_mutex(EvasVideoSinkPrivate* priv);
  73
  74 static void evas_video_sink_render_handler(void *data, void *buf, unsigned int len);
  75
  76 static void
  77 evas_video_sink_base_init(gpointer g_class)
  78 {
  79    GstElementClass* element_class;
  80
  81    element_class = GST_ELEMENT_CLASS(g_class);
  82    gst_element_class_add_pad_template(element_class, gst_static_pad_template_get(&sinktemplate));
  83    gst_element_class_set_details_simple(element_class, "Evas video sink",
  84                                         "Sink/Video", "Sends video data from a GStreamer pipeline to an Evas object",
  85                                         "Vincent Torri <vtorri@univ-evry.fr>");
  86 }
  87
  88 static void
  89 evas_video_sink_init(EvasVideoSink* sink, EvasVideoSinkClass* klass __UNUSED__)
  90 {
  91    EvasVideoSinkPrivate* priv;
  92
  93    sink->priv = priv = G_TYPE_INSTANCE_GET_PRIVATE(sink, EVAS_TYPE_VIDEO_SINK, EvasVideoSinkPrivate);
  94    priv->o = NULL;
  95    priv->p = ecore_pipe_add(evas_video_sink_render_handler, sink);
  96    priv->last_buffer = NULL;
  97    priv->width = 0;
  98    priv->height = 0;
  99    priv->format = GST_VIDEO_FORMAT_UNKNOWN;
 100    priv->data_cond = g_cond_new();
 101    priv->buffer_mutex = g_mutex_new();
 102    priv->preroll = EINA_FALSE;
 103    priv->unlocked = EINA_FALSE;
 104    priv->update_size = EINA_TRUE;
 105 }
 106
 107
 108 /**** Object methods ****/
 109
 110 static void
 111 evas_video_sink_set_property(GObject * object, guint prop_id,
 112                              const GValue * value, GParamSpec * pspec)
 113 {
 114    EvasVideoSink* sink;
 115    EvasVideoSinkPrivate* priv;
 116
 117    sink = EVAS_VIDEO_SINK (object);
 118    priv = sink->priv;
 119
 120    switch (prop_id) {
 121     case PROP_EVAS_OBJECT:
 122        g_mutex_lock(priv->buffer_mutex);
 123        priv->o = g_value_get_pointer (value);
 124        g_mutex_unlock(priv->buffer_mutex);
 125        break;
 126     default:
 127        G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 128        break;
 129    }
 130 }
 131
 132 static void
 133 evas_video_sink_get_property(GObject * object, guint prop_id,
 134                              GValue * value, GParamSpec * pspec)
 135 {
 136    EvasVideoSink* sink;
 137    EvasVideoSinkPrivate* priv;
 138
 139    sink = EVAS_VIDEO_SINK (object);
 140    priv = sink->priv;
 141
 142    switch (prop_id) {
 143     case PROP_EVAS_OBJECT:
 144        g_mutex_lock(priv->buffer_mutex);
 145        g_value_set_pointer (value, priv->o);
 146        g_mutex_unlock(priv->buffer_mutex);
 147        break;
 148     case PROP_WIDTH:
 149        g_mutex_lock(priv->buffer_mutex);
 150        g_value_set_int(value, priv->width);
 151        g_mutex_unlock(priv->buffer_mutex);
 152        break;
 153     case PROP_HEIGHT:
 154        g_mutex_lock(priv->buffer_mutex);
 155        g_value_set_int (value, priv->height);
 156        g_mutex_unlock(priv->buffer_mutex);
 157        break;
 158     default:
 159        G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 160        break;
 161    }
 162 }
 163
 164 static void
 165 evas_video_sink_dispose(GObject* object)
 166 {
 167    EvasVideoSink* sink;
 168    EvasVideoSinkPrivate* priv;
 169
 170    sink = EVAS_VIDEO_SINK(object);
 171    priv = sink->priv;
 172
 173    if (priv->buffer_mutex) {
 174       g_mutex_free(priv->buffer_mutex);
 175       priv->buffer_mutex = 0;
 176    }
 177
 178    if (priv->data_cond) {
 179       g_cond_free(priv->data_cond);
 180       priv->data_cond = 0;
 181    }
 182
 183    if (priv->p) {
 184       ecore_pipe_del(priv->p);
 185       priv->p = NULL;
 186    }
 187
 188    if (priv->last_buffer) {
 189       gst_buffer_unref(priv->last_buffer);
 190       priv->last_buffer = NULL;
 191    }
 192
 193    G_OBJECT_CLASS(parent_class)->dispose(object);
 194 }
 195
 196
 197 /**** BaseSink methods ****/
 198
 199 gboolean evas_video_sink_set_caps(GstBaseSink *bsink, GstCaps *caps)
 200 {
 201    EvasVideoSink* sink;
 202    EvasVideoSinkPrivate* priv;
 203    int width;
 204    int height;
 205
 206    sink = EVAS_VIDEO_SINK(bsink);
 207    priv = sink->priv;
 208
 209    if (G_UNLIKELY(!gst_video_format_parse_caps(caps, &priv->format, &width, &height))) {
 210       return FALSE;
 211    }
 212
 213    if ((width != priv->width) || (height != priv->height))
 214      {
 215         priv->width = width;
 216         priv->height = height;
 217         priv->update_size = EINA_TRUE;
 218      }
 219
 220    printf("format :");
 221    switch (priv->format)
 222      {
 223       case GST_VIDEO_FORMAT_I420:
 224          evas_object_image_size_set(priv->o, priv->width, priv->height);
 225          evas_object_image_colorspace_set(priv->o, EVAS_COLORSPACE_YCBCR422P601_PL);
 226          evas_object_image_alpha_set(priv->o, 0);
 227          printf ("I420\n");
 228          break;
 229       case GST_VIDEO_FORMAT_YV12:
 230          evas_object_image_size_set(priv->o, priv->width, priv->height);
 231          evas_object_image_colorspace_set(priv->o, EVAS_COLORSPACE_YCBCR422P601_PL);
 232          evas_object_image_alpha_set(priv->o, 0);
 233          printf ("YV12\n");
 234          break;
 235       case GST_VIDEO_FORMAT_BGR:
 236          printf ("BGR\n");
 237          break;
 238       case GST_VIDEO_FORMAT_BGRx:
 239          printf ("BGRx\n");
 240          break;
 241       case GST_VIDEO_FORMAT_BGRA:
 242          printf ("BGRA\n");
 243          break;
 244       default:
 245          printf ("unsupported : %d\n", priv->format);
 246          return FALSE;
 247      }
 248
 249    return TRUE;
 250 }
 251
 252 static gboolean
 253 evas_video_sink_start(GstBaseSink* base_sink)
 254 {
 255    EvasVideoSinkPrivate* priv;
 256    gboolean res = TRUE;
 257
 258    priv = EVAS_VIDEO_SINK(base_sink)->priv;
 259    g_mutex_lock(priv->buffer_mutex);
 260    if (!priv->o)
 261      res = FALSE;
 262    else
 263      {
 264         if (!priv->p)
 265           res = FALSE;
 266         else
 267           {
 268              priv->unlocked = EINA_FALSE;
 269           }
 270      }
 271    g_mutex_unlock(priv->buffer_mutex);
 272    return res;
 273 }
 274
 275 static gboolean
 276 evas_video_sink_stop(GstBaseSink* base_sink)
 277 {
 278    EvasVideoSinkPrivate* priv = EVAS_VIDEO_SINK(base_sink)->priv;
 279
 280    unlock_buffer_mutex(priv);
 281    return TRUE;
 282 }
 283
 284 static gboolean
 285 evas_video_sink_unlock(GstBaseSink* object)
 286 {
 287    EvasVideoSink* sink;
 288
 289    sink = EVAS_VIDEO_SINK(object);
 290
 291    unlock_buffer_mutex(sink->priv);
 292
 293    return GST_CALL_PARENT_WITH_DEFAULT(GST_BASE_SINK_CLASS, unlock,
 294                                        (object), TRUE);
 295 }
 296
 297 static gboolean
 298 evas_video_sink_unlock_stop(GstBaseSink* object)
 299 {
 300    EvasVideoSink* sink;
 301    EvasVideoSinkPrivate* priv;
 302
 303    sink = EVAS_VIDEO_SINK(object);
 304    priv = sink->priv;
 305
 306    g_mutex_lock(priv->buffer_mutex);
 307    priv->unlocked = FALSE;
 308    g_mutex_unlock(priv->buffer_mutex);
 309
 310    return GST_CALL_PARENT_WITH_DEFAULT(GST_BASE_SINK_CLASS, unlock_stop,
 311                                        (object), TRUE);
 312 }
 313
 314 static GstFlowReturn
 315 evas_video_sink_preroll(GstBaseSink* bsink, GstBuffer* buffer)
 316 {
 317    GstBuffer *send;
 318    EvasVideoSink* sink;
 319    EvasVideoSinkPrivate* priv;
 320
 321    sink = EVAS_VIDEO_SINK(bsink);
 322    priv = sink->priv;
 323
 324    send = gst_buffer_ref(buffer);
 325
 326    priv->preroll = EINA_TRUE;
 327
 328    ecore_pipe_write(priv->p, &send, sizeof(buffer));
 329    return GST_FLOW_OK;
 330 }
 331
 332 static GstFlowReturn
 333 evas_video_sink_render(GstBaseSink* bsink, GstBuffer* buffer)
 334 {
 335    GstBuffer *send;
 336    EvasVideoSink* sink;
 337    EvasVideoSinkPrivate* priv;
 338    Eina_Bool ret;
 339
 340    sink = EVAS_VIDEO_SINK(bsink);
 341    priv = sink->priv;
 342
 343    g_mutex_lock(priv->buffer_mutex);
 344
 345    if (priv->unlocked) {
 346       g_mutex_unlock(priv->buffer_mutex);
 347       return GST_FLOW_OK;
 348    }
 349
 350    priv->preroll = EINA_FALSE;
 351
 352    send = gst_buffer_ref(buffer);
 353    ret = ecore_pipe_write(priv->p, &send, sizeof(buffer));
 354    if (!ret)
 355      return GST_FLOW_ERROR;
 356
 357    g_cond_wait(priv->data_cond, priv->buffer_mutex);
 358    g_mutex_unlock(priv->buffer_mutex);
 359
 360    return GST_FLOW_OK;
 361 }
 362
 363 static void evas_video_sink_render_handler(void *data,
 364                                            void *buf,
 365                                            unsigned int len)
 366 {
 367    Emotion_Gstreamer_Video *ev;
 368    Emotion_Video_Stream *vstream;
 369    EvasVideoSink* sink;
 370    EvasVideoSinkPrivate* priv;
 371    GstBuffer* buffer;
 372    unsigned char *evas_data;
 373    const guint8 *gst_data;
 374    GstQuery *query;
 375    GstFormat fmt = GST_FORMAT_TIME;
 376    Evas_Coord w, h;
 377    gint64 pos;
 378
 379    sink = (EvasVideoSink *)data;
 380    priv = sink->priv;
 381
 382    buffer = *((GstBuffer **)buf);
 383
 384    if (priv->unlocked)
 385      goto exit_point;
 386
 387    gst_data = GST_BUFFER_DATA(buffer);
 388    if (!gst_data) goto exit_point;
 389    if (priv->update_size)
 390      {
 391         evas_object_image_size_set(priv->o, priv->width, priv->height);
 392         if (!priv->preroll) priv->update_size = FALSE;
 393      }
 394
 395    // This prevent a race condition when data are still in the pipe
 396    // but the buffer size as changed because of a request from
 397    // emotion smart (like on a file set).
 398    evas_object_image_size_get(priv->o, &w, &h);
 399    if (w != priv->width || h != priv->height)
 400      return ;
 401
 402    evas_data = (unsigned char *)evas_object_image_data_get(priv->o, 1);
 403
 404    // Evas's BGRA has pre-multiplied alpha while GStreamer's doesn't.
 405    // Here we convert to Evas's BGRA.
 406    if (priv->format == GST_VIDEO_FORMAT_BGR) {
 407       unsigned char *evas_tmp;
 408       int x;
 409       int y;
 410
 411       evas_tmp = evas_data;
 412       /* FIXME: could this be optimized ? */
 413       for (x = 0; x < priv->height; x++) {
 414          for (y = 0; y < priv->width; y++) {
 415             evas_tmp[0] = gst_data[0];
 416             evas_tmp[1] = gst_data[1];
 417             evas_tmp[2] = gst_data[2];
 418             evas_tmp[3] = 255;
 419             gst_data += 3;
 420             evas_tmp += 4;
 421          }
 422       }
 423    }
 424
 425    // Evas's BGRA has pre-multiplied alpha while GStreamer's doesn't.
 426    // Here we convert to Evas's BGRA.
 427    if (priv->format == GST_VIDEO_FORMAT_BGRx) {
 428       unsigned char *evas_tmp;
 429       int x;
 430       int y;
 431
 432       evas_tmp = evas_data;
 433       /* FIXME: could this be optimized ? */
 434       for (x = 0; x < priv->height; x++) {
 435          for (y = 0; y < priv->width; y++) {
 436             evas_tmp[0] = gst_data[0];
 437             evas_tmp[1] = gst_data[1];
 438             evas_tmp[2] = gst_data[2];
 439             evas_tmp[3] = 255;
 440             gst_data += 4;
 441             evas_tmp += 4;
 442          }
 443       }
 444    }
 445
 446    // Evas's BGRA has pre-multiplied alpha while GStreamer's doesn't.
 447    // Here we convert to Evas's BGRA.
 448    if (priv->format == GST_VIDEO_FORMAT_BGRA) {
 449       unsigned char *evas_tmp;
 450       int x;
 451       int y;
 452       unsigned char alpha;
 453
 454       evas_tmp = evas_data;
 455       /* FIXME: could this be optimized ? */
 456       for (x = 0; x < priv->height; x++) {
 457          for (y = 0; y < priv->width; y++) {
 458             alpha = gst_data[3];
 459             evas_tmp[0] = (gst_data[0] * alpha) / 255;
 460             evas_tmp[1] = (gst_data[1] * alpha) / 255;
 461             evas_tmp[2] = (gst_data[2] * alpha) / 255;
 462             evas_tmp[3] = alpha;
 463             gst_data += 4;
 464             evas_tmp += 4;
 465          }
 466       }
 467    }
 468
 469    if (priv->format == GST_VIDEO_FORMAT_I420) {
 470       int i;
 471       unsigned char **rows;
 472
 473       evas_object_image_pixels_dirty_set(priv->o, 1);
 474       rows = (unsigned char **)evas_data;
 475
 476       for (i = 0; i < priv->height; i++)
 477         rows[i] = &gst_data[i * priv->width];
 478
 479       rows += priv->height;
 480       for (i = 0; i < (priv->height / 2); i++)
 481         rows[i] = &gst_data[priv->height * priv->width + i * (priv->width / 2)];
 482
 483       rows += priv->height / 2;
 484       for (i = 0; i < (priv->height / 2); i++)
 485         rows[i] = &gst_data[priv->height * priv->width + priv->height * (priv->width /4) + i * (priv->width / 2)];
 486    }
 487
 488    if (priv->format == GST_VIDEO_FORMAT_YV12) {
 489       int i;
 490       unsigned char **rows;
 491
 492       evas_object_image_pixels_dirty_set(priv->o, 1);
 493
 494       rows = (unsigned char **)evas_data;
 495
 496       for (i = 0; i < priv->height; i++)
 497         rows[i] = &gst_data[i * priv->width];
 498
 499       rows += priv->height;
 500       for (i = 0; i < (priv->height / 2); i++)
 501         rows[i] = &gst_data[priv->height * priv->width + priv->height * (priv->width /4) + i * (priv->width / 2)];
 502
 503       rows += priv->height / 2;
 504       for (i = 0; i < (priv->height / 2); i++)
 505         rows[i] = &gst_data[priv->height * priv->width + i * (priv->width / 2)];
 506    }
 507
 508    evas_object_image_data_update_add(priv->o, 0, 0, priv->width, priv->height);
 509    evas_object_image_data_set(priv->o, evas_data);
 510    evas_object_image_pixels_dirty_set(priv->o, 0);
 511
 512    ev = evas_object_data_get(priv->o, "_emotion_gstreamer_video");
 513    _emotion_frame_new(ev->obj);
 514
 515    vstream = eina_list_nth(ev->video_streams, ev->video_stream_nbr - 1);
 516
 517    gst_element_query_position(ev->pipeline, &fmt, &pos);
 518    ev->position = (double)pos / (double)GST_SECOND;
 519
 520    vstream->width = priv->width;
 521    vstream->height = priv->height;
 522    ev->ratio = (double) priv->width / (double) priv->height;
 523
 524    _emotion_video_pos_update(ev->obj, ev->position, vstream->length_time);
 525    _emotion_frame_resize(ev->obj, priv->width, priv->height, ev->ratio);
 526
 527  exit_point:
 528    if (priv->last_buffer) gst_buffer_unref(priv->last_buffer);
 529    priv->last_buffer = buffer;
 530
 531    if (priv->preroll) return ;
 532
 533    g_mutex_lock(priv->buffer_mutex);
 534
 535    if (priv->unlocked) {
 536       g_mutex_unlock(priv->buffer_mutex);
 537       return;
 538    }
 539
 540    g_cond_signal(priv->data_cond);
 541    g_mutex_unlock(priv->buffer_mutex);
 542 }
 543
 544 static void
 545 unlock_buffer_mutex(EvasVideoSinkPrivate* priv)
 546 {
 547    g_mutex_lock(priv->buffer_mutex);
 548
 549    priv->unlocked = EINA_TRUE;
 550    g_cond_signal(priv->data_cond);
 551    g_mutex_unlock(priv->buffer_mutex);
 552 }
 553
 554 static void
 555 marshal_VOID__MINIOBJECT(GClosure * closure, GValue * return_value __UNUSED__,
 556                          guint n_param_values, const GValue * param_values,
 557                          gpointer invocation_hint __UNUSED__, gpointer marshal_data)
 558 {
 559    typedef void (*marshalfunc_VOID__MINIOBJECT) (gpointer obj, gpointer arg1, gpointer data2);
 560    marshalfunc_VOID__MINIOBJECT callback;
 561    GCClosure *cc;
 562    gpointer data1, data2;
 563
 564    cc = (GCClosure *) closure;
 565
 566    g_return_if_fail(n_param_values == 2);
 567
 568    if (G_CCLOSURE_SWAP_DATA(closure)) {
 569       data1 = closure->data;
 570       data2 = g_value_peek_pointer(param_values + 0);
 571    } else {
 572       data1 = g_value_peek_pointer(param_values + 0);
 573       data2 = closure->data;
 574    }
 575    callback = (marshalfunc_VOID__MINIOBJECT) (marshal_data ? marshal_data : cc->callback);
 576
 577    callback(data1, gst_value_get_mini_object(param_values + 1), data2);
 578 }
 579
 580 static void
 581 evas_video_sink_class_init(EvasVideoSinkClass* klass)
 582 {
 583    GObjectClass* gobject_class;
 584    GstBaseSinkClass* gstbase_sink_class;
 585
 586    gobject_class = G_OBJECT_CLASS(klass);
 587    gstbase_sink_class = GST_BASE_SINK_CLASS(klass);
 588
 589    g_type_class_add_private(klass, sizeof(EvasVideoSinkPrivate));
 590
 591    gobject_class->set_property = evas_video_sink_set_property;
 592    gobject_class->get_property = evas_video_sink_get_property;
 593
 594    g_object_class_install_property (gobject_class, PROP_EVAS_OBJECT,
 595                                     g_param_spec_pointer ("evas-object", "Evas Object",
 596                                                           "The Evas object where the display of the video will be done",
 597                                                           G_PARAM_READWRITE));
 598
 599    g_object_class_install_property (gobject_class, PROP_WIDTH,
 600                                     g_param_spec_int ("width", "Width",
 601                                                       "The width of the video",
 602                                                       0, 65536, 0, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
 603
 604    g_object_class_install_property (gobject_class, PROP_HEIGHT,
 605                                     g_param_spec_int ("height", "Height",
 606                                                       "The height of the video",
 607                                                       0, 65536, 0, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
 608
 609    gobject_class->dispose = evas_video_sink_dispose;
 610
 611    gstbase_sink_class->set_caps = evas_video_sink_set_caps;
 612    gstbase_sink_class->stop = evas_video_sink_stop;
 613    gstbase_sink_class->start = evas_video_sink_start;
 614    gstbase_sink_class->unlock = evas_video_sink_unlock;
 615    gstbase_sink_class->unlock_stop = evas_video_sink_unlock_stop;
 616    gstbase_sink_class->render = evas_video_sink_render;
 617    gstbase_sink_class->preroll = evas_video_sink_preroll;
 618
 619    evas_video_sink_signals[REPAINT_REQUESTED] = g_signal_new("repaint-requested",
 620                                                              G_TYPE_FROM_CLASS(klass),
 621                                                              (GSignalFlags)(G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION),
 622                                                              0,
 623                                                              0,
 624                                                              0,
 625                                                              marshal_VOID__MINIOBJECT,
 626                                                              G_TYPE_NONE, 1, GST_TYPE_BUFFER);
 627 }
 628
 629 gboolean
 630 gstreamer_plugin_init (GstPlugin * plugin)
 631 {
 632    return gst_element_register (plugin,
 633                                 "emotion-sink",
 634                                 GST_RANK_NONE,
 635                                 EVAS_TYPE_VIDEO_SINK);
 636 }
 637
 638 GstElement *
 639 gstreamer_video_sink_new(Emotion_Gstreamer_Video *ev,
 640                          Evas_Object *o,
 641                          const char *uri)
 642 {
 643    GstElement *playbin;
 644    GstElement *sink;
 645    Evas_Object *obj;
 646    GstStateChangeReturn res;
 647
 648    obj = _emotion_image_get(o);
 649    if (!obj)
 650      {
 651         ERR("Not Evas_Object specified");
 652         return NULL;
 653      }
 654
 655    playbin = gst_element_factory_make("playbin2", "playbin");
 656    if (!playbin)
 657      {
 658         ERR("Unable to create 'playbin' GstElement.");
 659         return NULL;
 660      }
 661
 662    sink = gst_element_factory_make("emotion-sink", "sink");
 663    if (!sink)
 664      {
 665         ERR("Unable to create 'emotion-sink' GstElement.");
 666         goto unref_pipeline;
 667      }
 668
 669    g_object_set(G_OBJECT(playbin), "video-sink", sink, NULL);
 670    g_object_set(G_OBJECT(playbin), "uri", uri, NULL);
 671    g_object_set(G_OBJECT(sink), "evas-object", obj, NULL);
 672
 673    res = gst_element_set_state(playbin, GST_STATE_PAUSED);
 674    if (res == GST_STATE_CHANGE_FAILURE)
 675      {
 676         ERR("Unable to set GST_STATE_PAUSED.");
 677         goto unref_pipeline;
 678      }
 679
 680    res = gst_element_get_state(playbin, NULL, NULL, GST_CLOCK_TIME_NONE);
 681    if (res != GST_STATE_CHANGE_SUCCESS)
 682      {
 683         ERR("Unable to get GST_CLOCK_TIME_NONE.");
 684         goto unref_pipeline;
 685      }
 686
 687    evas_object_data_set(obj, "_emotion_gstreamer_video", ev);
 688
 689    /** NOTE: you need to set: GST_DEBUG_DUMP_DOT_DIR=/tmp EMOTION_ENGINE=gstreamer to save the $EMOTION_GSTREAMER_DOT file in '/tmp' */
 690    /** then call dot -Tpng -oemotion_pipeline.png /tmp/$TIMESTAMP-$EMOTION_GSTREAMER_DOT.dot */
 691    if (getenv("EMOTION_GSTREAMER_DOT")) GST_DEBUG_BIN_TO_DOT_FILE_WITH_TS(GST_BIN(playbin), GST_DEBUG_GRAPH_SHOW_ALL, getenv("EMOTION_GSTREAMER_DOT"));
 692
 693    return playbin;
 694
 695  unref_pipeline:
 696    gst_object_unref(playbin);
 697    return NULL;
 698 }