code.vuplus.com Git - vuplus_dvbapp/blob - lib/service/servicemp3.cpp

   1 #ifdef HAVE_GSTREAMER
   2
   3         /* note: this requires gstreamer 0.10.x and a big list of plugins. */
   4         /* it's currently hardcoded to use a big-endian alsasink as sink. */
   5 #include <lib/base/eerror.h>
   6 #include <lib/base/object.h>
   7 #include <lib/base/ebase.h>
   8 #include <string>
   9 #include <lib/service/servicemp3.h>
  10 #include <lib/service/service.h>
  11 #include <lib/base/init_num.h>
  12 #include <lib/base/init.h>
  13 #include <gst/gst.h>
  14
  15 // eServiceFactoryMP3
  16
  17 eServiceFactoryMP3::eServiceFactoryMP3()
  18 {
  19         ePtr<eServiceCenter> sc;
  20
  21         eServiceCenter::getPrivInstance(sc);
  22         if (sc)
  23         {
  24                 std::list<std::string> extensions;
  25                 extensions.push_back("mp3");
  26                 extensions.push_back("ogg");
  27                 extensions.push_back("mpg");
  28                 extensions.push_back("vob");
  29                 extensions.push_back("wav");
  30                 extensions.push_back("wave");
  31                 sc->addServiceFactory(eServiceFactoryMP3::id, this, extensions);
  32         }
  33
  34         m_service_info = new eStaticServiceMP3Info();
  35 }
  36
  37 eServiceFactoryMP3::~eServiceFactoryMP3()
  38 {
  39         ePtr<eServiceCenter> sc;
  40
  41         eServiceCenter::getPrivInstance(sc);
  42         if (sc)
  43                 sc->removeServiceFactory(eServiceFactoryMP3::id);
  44 }
  45
  46 DEFINE_REF(eServiceFactoryMP3)
  47
  48         // iServiceHandler
  49 RESULT eServiceFactoryMP3::play(const eServiceReference &ref, ePtr<iPlayableService> &ptr)
  50 {
  51                 // check resources...
  52         ptr = new eServiceMP3(ref.path.c_str());
  53         return 0;
  54 }
  55
  56 RESULT eServiceFactoryMP3::record(const eServiceReference &ref, ePtr<iRecordableService> &ptr)
  57 {
  58         ptr=0;
  59         return -1;
  60 }
  61
  62 RESULT eServiceFactoryMP3::list(const eServiceReference &, ePtr<iListableService> &ptr)
  63 {
  64         ptr=0;
  65         return -1;
  66 }
  67
  68 RESULT eServiceFactoryMP3::info(const eServiceReference &ref, ePtr<iStaticServiceInformation> &ptr)
  69 {
  70         ptr = m_service_info;
  71         return 0;
  72 }
  73
  74 RESULT eServiceFactoryMP3::offlineOperations(const eServiceReference &, ePtr<iServiceOfflineOperations> &ptr)
  75 {
  76         ptr = 0;
  77         return -1;
  78 }
  79
  80
  81 // eStaticServiceMP3Info
  82
  83
  84 // eStaticServiceMP3Info is seperated from eServiceMP3 to give information
  85 // about unopened files.
  86
  87 // probably eServiceMP3 should use this class as well, and eStaticServiceMP3Info
  88 // should have a database backend where ID3-files etc. are cached.
  89 // this would allow listing the mp3 database based on certain filters.
  90
  91 DEFINE_REF(eStaticServiceMP3Info)
  92
  93 eStaticServiceMP3Info::eStaticServiceMP3Info()
  94 {
  95 }
  96
  97 RESULT eStaticServiceMP3Info::getName(const eServiceReference &ref, std::string &name)
  98 {
  99         size_t last = ref.path.rfind('/');
 100         if (last != std::string::npos)
 101                 name = ref.path.substr(last+1);
 102         else
 103                 name = ref.path;
 104         return 0;
 105 }
 106
 107 int eStaticServiceMP3Info::getLength(const eServiceReference &ref)
 108 {
 109         return -1;
 110 }
 111
 112 // eServiceMP3
 113
 114 eServiceMP3::eServiceMP3(const char *filename): m_filename(filename), m_pump(eApp, 1)
 115 {
 116         m_stream_tags = 0;
 117         CONNECT(m_pump.recv_msg, eServiceMP3::gstPoll);
 118         GstElement *source = 0;
 119
 120         GstElement *filter = 0, *decoder = 0, *conv = 0, *flt = 0, *sink = 0; /* for audio */
 121
 122         GstElement *audio = 0, *queue_audio = 0, *video = 0, *queue_video = 0, *mpegdemux = 0;
 123
 124         m_state = stIdle;
 125         eDebug("SERVICEMP3 construct!");
 126
 127                 /* FIXME: currently, decodebin isn't possible for
 128                    video streams. in that case, make a manual pipeline. */
 129
 130         const char *ext = strrchr(filename, '.');
 131         if (!ext)
 132                 ext = filename;
 133
 134         int is_mpeg_ps = !(strcasecmp(ext, ".mpeg") && strcasecmp(ext, ".mpg") && strcasecmp(ext, ".vob") && strcasecmp(ext, ".bin"));
 135         int is_mpeg_ts = !strcasecmp(ext, ".ts");
 136         int is_mp3 = !strcasecmp(ext, ".mp3"); /* force mp3 instead of decodebin */
 137         int is_video = is_mpeg_ps || is_mpeg_ts;
 138         int is_streaming = !strncmp(filename, "http://", 7);
 139
 140         eDebug("filename: %s, is_mpeg_ps: %d, is_mpeg_ts: %d, is_video: %d, is_streaming: %d, is_mp3: %d", filename, is_mpeg_ps, is_mpeg_ts, is_video, is_streaming, is_mp3);
 141
 142         int is_audio = !is_video;
 143
 144         int all_ok = 0;
 145
 146         m_gst_pipeline = gst_pipeline_new ("audio-player");
 147         if (!m_gst_pipeline)
 148                 eWarning("failed to create pipeline");
 149
 150         if (!is_streaming)
 151                 source = gst_element_factory_make ("filesrc", "file-source");
 152         else
 153         {
 154                 source = gst_element_factory_make ("neonhttpsrc", "http-source");
 155                 if (source)
 156                         g_object_set (G_OBJECT (source), "automatic-redirect", TRUE, NULL);
 157         }
 158
 159         if (!source)
 160                 eWarning("failed to create %s", is_streaming ? "neonhttpsrc" : "filesrc");
 161         else
 162                                 /* configure source */
 163                 g_object_set (G_OBJECT (source), "location", filename, NULL);
 164
 165         if (is_audio)
 166         {
 167                         /* filesrc -> decodebin -> audioconvert -> capsfilter -> alsasink */
 168                 const char *decodertype = is_mp3 ? "mad" : "decodebin";
 169
 170                 decoder = gst_element_factory_make (decodertype, "decoder");
 171                 if (!decoder)
 172                         eWarning("failed to create %s decoder", decodertype);
 173
 174                         /* mp3 decoding needs id3demux to extract ID3 data. 'decodebin' would do that internally. */
 175                 if (is_mp3)
 176                 {
 177                         filter = gst_element_factory_make ("id3demux", "filter");
 178                         if (!filter)
 179                                 eWarning("failed to create id3demux");
 180                 }
 181
 182                 conv = gst_element_factory_make ("audioconvert", "converter");
 183                 if (!conv)
 184                         eWarning("failed to create audioconvert");
 185
 186                 flt = gst_element_factory_make ("capsfilter", "flt");
 187                 if (!flt)
 188                         eWarning("failed to create capsfilter");
 189
 190                         /* for some reasons, we need to set the sample format to depth/width=16, because auto negotiation doesn't work. */
 191                         /* endianness, however, is not required to be set anymore. */
 192                 if (flt)
 193                 {
 194                         GstCaps *caps = gst_caps_new_simple("audio/x-raw-int", /* "endianness", G_TYPE_INT, 4321, */ "depth", G_TYPE_INT, 16, "width", G_TYPE_INT, 16, "channels", G_TYPE_INT, 2, (char*)0);
 195                         g_object_set (G_OBJECT (flt), "caps", caps, (char*)0);
 196                         gst_caps_unref(caps);
 197                 }
 198
 199                 sink = gst_element_factory_make ("alsasink", "alsa-output");
 200                 if (!sink)
 201                         eWarning("failed to create osssink");
 202
 203                 if (source && decoder && conv && sink)
 204                         all_ok = 1;
 205         } else /* is_video */
 206         {
 207                         /* filesrc -> mpegdemux -> | queue_audio -> dvbaudiosink
 208                                                    | queue_video -> dvbvideosink */
 209
 210                 audio = gst_element_factory_make("dvbaudiosink", "audio");
 211                 queue_audio = gst_element_factory_make("queue", "queue_audio");
 212
 213                 video = gst_element_factory_make("dvbvideosink", "video");
 214                 queue_video = gst_element_factory_make("queue", "queue_video");
 215
 216                 if (is_mpeg_ps)
 217                         mpegdemux = gst_element_factory_make("flupsdemux", "mpegdemux");
 218                 else
 219                         mpegdemux = gst_element_factory_make("flutsdemux", "mpegdemux");
 220
 221                 if (!mpegdemux)
 222                 {
 223                         eDebug("fluendo mpegdemux not available, falling back to mpegdemux\n");
 224                         mpegdemux = gst_element_factory_make("mpegdemux", "mpegdemux");
 225                 }
 226
 227                 eDebug("audio: %p, queue_audio %p, video %p, queue_video %p, mpegdemux %p", audio, queue_audio, video, queue_video, mpegdemux);
 228                 if (audio && queue_audio && video && queue_video && mpegdemux)
 229                 {
 230                         g_object_set (G_OBJECT (queue_audio), "max-size-buffers", 0, NULL);
 231                         g_object_set (G_OBJECT (queue_audio), "max-size-time", (guint64)0, NULL);
 232                         g_object_set (G_OBJECT (queue_video), "max-size-buffers", 0, NULL);
 233                         g_object_set (G_OBJECT (queue_video), "max-size-time", (guint64)0, NULL);
 234                         all_ok = 1;
 235                 }
 236         }
 237
 238         if (m_gst_pipeline && all_ok)
 239         {
 240                 gst_bus_set_sync_handler(gst_pipeline_get_bus (GST_PIPELINE (m_gst_pipeline)), gstBusSyncHandler, this);
 241
 242                 if (is_audio)
 243                 {
 244                         if (!is_mp3)
 245                         {
 246                                         /* decodebin has dynamic pads. When they get created, we connect them to the audio bin */
 247                                 g_signal_connect (decoder, "new-decoded-pad", G_CALLBACK(gstCBnewPad), this);
 248                                 g_signal_connect (decoder, "unknown-type", G_CALLBACK(gstCBunknownType), this);
 249                         }
 250
 251                                 /* gst_bin will take the 'floating references' */
 252                         gst_bin_add_many (GST_BIN (m_gst_pipeline),
 253                                                 source, decoder, NULL);
 254
 255                         if (filter)
 256                         {
 257                                         /* id3demux also has dynamic pads, which need to be connected to the decoder (this is done in the 'gstCBfilterPadAdded' CB) */
 258                                 gst_bin_add(GST_BIN(m_gst_pipeline), filter);
 259                                 gst_element_link(source, filter);
 260                                 m_decoder = decoder;
 261                                 g_signal_connect (filter, "pad-added", G_CALLBACK(gstCBfilterPadAdded), this);
 262                         } else
 263                                         /* in decodebin's case we can just connect the source with the decodebin, and decodebin will take care about id3demux (or whatever is required) */
 264                                 gst_element_link(source, decoder);
 265
 266                                 /* create audio bin with the audioconverter, the capsfilter and the audiosink */
 267                         m_gst_audio = gst_bin_new ("audiobin");
 268
 269                         GstPad *audiopad = gst_element_get_pad (conv, "sink");
 270                         gst_bin_add_many(GST_BIN(m_gst_audio), conv, flt, sink, (char*)0);
 271                         gst_element_link_many(conv, flt, sink, (char*)0);
 272                         gst_element_add_pad(m_gst_audio, gst_ghost_pad_new ("sink", audiopad));
 273                         gst_object_unref(audiopad);
 274                         gst_bin_add (GST_BIN(m_gst_pipeline), m_gst_audio);
 275
 276                                 /* in mad's case, we can directly connect the decoder to the audiobin. otherwise, we do this in gstCBnewPad */
 277                         if (is_mp3)
 278                                 gst_element_link(decoder, m_gst_audio);
 279                 } else
 280                 {
 281                         gst_bin_add_many(GST_BIN(m_gst_pipeline), source, mpegdemux, audio, queue_audio, video, queue_video, NULL);
 282                         gst_element_link(source, mpegdemux);
 283                         gst_element_link(queue_audio, audio);
 284                         gst_element_link(queue_video, video);
 285
 286                         m_gst_audioqueue = queue_audio;
 287                         m_gst_videoqueue = queue_video;
 288
 289                         g_signal_connect(mpegdemux, "pad-added", G_CALLBACK (gstCBpadAdded), this);
 290                 }
 291         } else
 292         {
 293                 if (m_gst_pipeline)
 294                         gst_object_unref(GST_OBJECT(m_gst_pipeline));
 295                 if (source)
 296                         gst_object_unref(GST_OBJECT(source));
 297                 if (decoder)
 298                         gst_object_unref(GST_OBJECT(decoder));
 299                 if (conv)
 300                         gst_object_unref(GST_OBJECT(conv));
 301                 if (sink)
 302                         gst_object_unref(GST_OBJECT(sink));
 303
 304                 if (audio)
 305                         gst_object_unref(GST_OBJECT(audio));
 306                 if (queue_audio)
 307                         gst_object_unref(GST_OBJECT(queue_audio));
 308                 if (video)
 309                         gst_object_unref(GST_OBJECT(video));
 310                 if (queue_video)
 311                         gst_object_unref(GST_OBJECT(queue_video));
 312                 if (mpegdemux)
 313                         gst_object_unref(GST_OBJECT(mpegdemux));
 314
 315                 eDebug("sorry, can't play.");
 316                 m_gst_pipeline = 0;
 317         }
 318
 319         gst_element_set_state (m_gst_pipeline, GST_STATE_PLAYING);
 320 }
 321
 322 eServiceMP3::~eServiceMP3()
 323 {
 324         if (m_state == stRunning)
 325                 stop();
 326
 327         if (m_stream_tags)
 328                 gst_tag_list_free(m_stream_tags);
 329
 330         if (m_gst_pipeline)
 331         {
 332                 gst_object_unref (GST_OBJECT (m_gst_pipeline));
 333                 eDebug("SERVICEMP3 destruct!");
 334         }
 335 }
 336
 337 DEFINE_REF(eServiceMP3);
 338
 339 RESULT eServiceMP3::connectEvent(const Slot2<void,iPlayableService*,int> &event, ePtr<eConnection> &connection)
 340 {
 341         connection = new eConnection((iPlayableService*)this, m_event.connect(event));
 342         return 0;
 343 }
 344
 345 RESULT eServiceMP3::start()
 346 {
 347         assert(m_state == stIdle);
 348
 349         m_state = stRunning;
 350         if (m_gst_pipeline)
 351         {
 352                 eDebug("starting pipeline");
 353                 gst_element_set_state (m_gst_pipeline, GST_STATE_PLAYING);
 354         }
 355         m_event(this, evStart);
 356         return 0;
 357 }
 358
 359 RESULT eServiceMP3::stop()
 360 {
 361         assert(m_state != stIdle);
 362         if (m_state == stStopped)
 363                 return -1;
 364         printf("MP3: %s stop\n", m_filename.c_str());
 365         gst_element_set_state(m_gst_pipeline, GST_STATE_NULL);
 366         m_state = stStopped;
 367         return 0;
 368 }
 369
 370 RESULT eServiceMP3::setTarget(int target)
 371 {
 372         return -1;
 373 }
 374
 375 RESULT eServiceMP3::pause(ePtr<iPauseableService> &ptr)
 376 {
 377         ptr=this;
 378         return 0;
 379 }
 380
 381 RESULT eServiceMP3::setSlowMotion(int ratio)
 382 {
 383         return -1;
 384 }
 385
 386 RESULT eServiceMP3::setFastForward(int ratio)
 387 {
 388         return -1;
 389 }
 390
 391                 // iPausableService
 392 RESULT eServiceMP3::pause()
 393 {
 394         if (!m_gst_pipeline)
 395                 return -1;
 396         gst_element_set_state(m_gst_pipeline, GST_STATE_PAUSED);
 397         return 0;
 398 }
 399
 400 RESULT eServiceMP3::unpause()
 401 {
 402         if (!m_gst_pipeline)
 403                 return -1;
 404         gst_element_set_state(m_gst_pipeline, GST_STATE_PLAYING);
 405         return 0;
 406 }
 407
 408         /* iSeekableService */
 409 RESULT eServiceMP3::seek(ePtr<iSeekableService> &ptr)
 410 {
 411         ptr = this;
 412         return 0;
 413 }
 414
 415 RESULT eServiceMP3::getLength(pts_t &pts)
 416 {
 417         if (!m_gst_pipeline)
 418                 return -1;
 419         if (m_state != stRunning)
 420                 return -1;
 421
 422         GstFormat fmt = GST_FORMAT_TIME;
 423         gint64 len;
 424
 425         if (!gst_element_query_duration(m_gst_pipeline, &fmt, &len))
 426                 return -1;
 427
 428                 /* len is in nanoseconds. we have 90 000 pts per second. */
 429
 430         pts = len / 11111;
 431         return 0;
 432 }
 433
 434 RESULT eServiceMP3::seekTo(pts_t to)
 435 {
 436         if (!m_gst_pipeline)
 437                 return -1;
 438
 439                 /* convert pts to nanoseconds */
 440         gint64 time_nanoseconds = to * 11111LL;
 441         if (!gst_element_seek (m_gst_pipeline, 1.0, GST_FORMAT_TIME, GST_SEEK_FLAG_FLUSH,
 442                 GST_SEEK_TYPE_SET, time_nanoseconds,
 443                 GST_SEEK_TYPE_NONE, GST_CLOCK_TIME_NONE))
 444         {
 445                 eDebug("SEEK failed");
 446                 return -1;
 447         }
 448         return 0;
 449 }
 450
 451 RESULT eServiceMP3::seekRelative(int direction, pts_t to)
 452 {
 453         if (!m_gst_pipeline)
 454                 return -1;
 455
 456         pause();
 457
 458         pts_t ppos;
 459         getPlayPosition(ppos);
 460         ppos += to * direction;
 461         if (ppos < 0)
 462                 ppos = 0;
 463         seekTo(ppos);
 464
 465         unpause();
 466
 467         return 0;
 468 }
 469
 470 RESULT eServiceMP3::getPlayPosition(pts_t &pts)
 471 {
 472         if (!m_gst_pipeline)
 473                 return -1;
 474         if (m_state != stRunning)
 475                 return -1;
 476
 477         GstFormat fmt = GST_FORMAT_TIME;
 478         gint64 len;
 479
 480         if (!gst_element_query_position(m_gst_pipeline, &fmt, &len))
 481                 return -1;
 482
 483                 /* len is in nanoseconds. we have 90 000 pts per second. */
 484         pts = len / 11111;
 485         return 0;
 486 }
 487
 488 RESULT eServiceMP3::setTrickmode(int trick)
 489 {
 490                 /* trickmode currently doesn't make any sense for us. */
 491         return -1;
 492 }
 493
 494 RESULT eServiceMP3::isCurrentlySeekable()
 495 {
 496         return 1;
 497 }
 498
 499 RESULT eServiceMP3::info(ePtr<iServiceInformation>&i)
 500 {
 501         i = this;
 502         return 0;
 503 }
 504
 505 RESULT eServiceMP3::getName(std::string &name)
 506 {
 507         name = m_filename;
 508         size_t n = name.rfind('/');
 509         if (n != std::string::npos)
 510                 name = name.substr(n + 1);
 511         return 0;
 512 }
 513
 514 int eServiceMP3::getInfo(int w)
 515 {
 516         switch (w)
 517         {
 518         case sTitle:
 519         case sArtist:
 520         case sAlbum:
 521         case sComment:
 522         case sTracknumber:
 523         case sGenre:
 524                 return resIsString;
 525
 526         default:
 527                 return resNA;
 528         }
 529 }
 530
 531 std::string eServiceMP3::getInfoString(int w)
 532 {
 533         gchar *tag = 0;
 534         switch (w)
 535         {
 536         case sTitle:
 537                 tag = GST_TAG_TITLE;
 538                 break;
 539         case sArtist:
 540                 tag = GST_TAG_ARTIST;
 541                 break;
 542         case sAlbum:
 543                 tag = GST_TAG_ALBUM;
 544                 break;
 545         case sComment:
 546                 tag = GST_TAG_COMMENT;
 547                 break;
 548         case sTracknumber:
 549                 tag = GST_TAG_TRACK_NUMBER;
 550                 break;
 551         case sGenre:
 552                 tag = GST_TAG_GENRE;
 553                 break;
 554         default:
 555                 return "";
 556         }
 557
 558         if (!m_stream_tags || !tag)
 559                 return "";
 560
 561         gchar *value;
 562
 563         if (gst_tag_list_get_string(m_stream_tags, tag, &value))
 564         {
 565                 std::string res = value;
 566                 g_free(value);
 567                 return res;
 568         }
 569
 570         return "";
 571 }
 572
 573
 574                 void foreach(const GstTagList *list, const gchar *tag, gpointer user_data)
 575                 {
 576                         if (tag)
 577                                 eDebug("Tag: %c%c%c%c", tag[0], tag[1], tag[2], tag[3]);
 578
 579                 }
 580
 581 void eServiceMP3::gstBusCall(GstBus *bus, GstMessage *msg)
 582 {
 583         if (msg)
 584         {
 585                 gchar *string = gst_structure_to_string(gst_message_get_structure(msg));
 586                 eDebug("gst_message: %s", string);
 587                 g_free(string);
 588         }
 589
 590         switch (GST_MESSAGE_TYPE (msg))
 591         {
 592         case GST_MESSAGE_EOS:
 593                 m_event((iPlayableService*)this, evEOF);
 594                 break;
 595         case GST_MESSAGE_ERROR:
 596         {
 597                 gchar *debug;
 598                 GError *err;
 599                 gst_message_parse_error (msg, &err, &debug);
 600                 g_free (debug);
 601                 eWarning("Gstreamer error: %s", err->message);
 602                 g_error_free(err);
 603                         /* TODO: signal error condition to user */
 604                 break;
 605         }
 606         case GST_MESSAGE_TAG:
 607         {
 608                 GstTagList *tags, *result;
 609                 gst_message_parse_tag(msg, &tags);
 610
 611                 result = gst_tag_list_merge(m_stream_tags, tags, GST_TAG_MERGE_PREPEND);
 612                 if (result)
 613                 {
 614                         if (m_stream_tags)
 615                                 gst_tag_list_free(m_stream_tags);
 616                         m_stream_tags = result;
 617                 }
 618                 gst_tag_list_free(tags);
 619
 620                 m_event((iPlayableService*)this, evUpdatedInfo);
 621                 break;
 622         }
 623         default:
 624                 break;
 625         }
 626 }
 627
 628 GstBusSyncReply eServiceMP3::gstBusSyncHandler(GstBus *bus, GstMessage *message, gpointer user_data)
 629 {
 630         eServiceMP3 *_this = (eServiceMP3*)user_data;
 631         _this->m_pump.send(1);
 632                 /* wake */
 633         return GST_BUS_PASS;
 634 }
 635
 636 void eServiceMP3::gstCBpadAdded(GstElement *decodebin, GstPad *pad, gpointer user_data)
 637 {
 638         eServiceMP3 *_this = (eServiceMP3*)user_data;
 639
 640         gchar *name;
 641         name = gst_pad_get_name (pad);
 642         g_print ("A new pad %s was created\n", name);
 643         if (!strncmp(name, "audio_", 6)) // mpegdemux uses video_nn with n=0,1,.., flupsdemux uses stream id
 644                 gst_pad_link(pad, gst_element_get_pad (_this->m_gst_audioqueue, "sink"));
 645         if (!strncmp(name, "video_", 6))
 646                 gst_pad_link(pad, gst_element_get_pad (_this->m_gst_videoqueue, "sink"));
 647         g_free (name);
 648
 649 }
 650
 651 void eServiceMP3::gstCBfilterPadAdded(GstElement *filter, GstPad *pad, gpointer user_data)
 652 {
 653         eServiceMP3 *_this = (eServiceMP3*)user_data;
 654         gst_pad_link(pad, gst_element_get_pad (_this->m_decoder, "sink"));
 655 }
 656
 657 void eServiceMP3::gstCBnewPad(GstElement *decodebin, GstPad *pad, gboolean last, gpointer user_data)
 658 {
 659         eServiceMP3 *_this = (eServiceMP3*)user_data;
 660         GstCaps *caps;
 661         GstStructure *str;
 662         GstPad *audiopad;
 663
 664         /* only link once */
 665         audiopad = gst_element_get_pad (_this->m_gst_audio, "sink");
 666         if (GST_PAD_IS_LINKED (audiopad)) {
 667                 eDebug("audio already linked!");
 668                 g_object_unref (audiopad);
 669                 return;
 670         }
 671
 672         /* check media type */
 673         caps = gst_pad_get_caps (pad);
 674         str = gst_caps_get_structure (caps, 0);
 675         eDebug("gst new pad! %s", gst_structure_get_name (str));
 676
 677         if (!g_strrstr (gst_structure_get_name (str), "audio")) {
 678                 gst_caps_unref (caps);
 679                 gst_object_unref (audiopad);
 680                 return;
 681         }
 682
 683         gst_caps_unref (caps);
 684         gst_pad_link (pad, audiopad);
 685 }
 686
 687 void eServiceMP3::gstCBunknownType(GstElement *decodebin, GstPad *pad, GstCaps *caps, gpointer user_data)
 688 {
 689         eServiceMP3 *_this = (eServiceMP3*)user_data;
 690         GstStructure *str;
 691
 692         /* check media type */
 693         caps = gst_pad_get_caps (pad);
 694         str = gst_caps_get_structure (caps, 0);
 695         eDebug("unknown type: %s - this can't be decoded.", gst_structure_get_name (str));
 696         gst_caps_unref (caps);
 697 }
 698
 699 void eServiceMP3::gstPoll(const int&)
 700 {
 701                 /* ok, we have a serious problem here. gstBusSyncHandler sends
 702                    us the wakup signal, but likely before it was posted.
 703                    the usleep, an EVIL HACK (DON'T DO THAT!!!) works around this.
 704
 705                    I need to understand the API a bit more to make this work
 706                    proplerly. */
 707         usleep(1);
 708
 709         GstBus *bus = gst_pipeline_get_bus (GST_PIPELINE (m_gst_pipeline));
 710         GstMessage *message;
 711         while ((message = gst_bus_pop (bus)))
 712         {
 713                 gstBusCall(bus, message);
 714                 gst_message_unref (message);
 715         }
 716 }
 717
 718 eAutoInitPtr<eServiceFactoryMP3> init_eServiceFactoryMP3(eAutoInitNumbers::service+1, "eServiceFactoryMP3");
 719 #else
 720 #warning gstreamer not available, not building media player
 721 #endif