git.sesse.net Git - mlt/blob - src/modules/decklink/consumer_decklink.cpp

   1 /*
   2  * consumer_decklink.c -- output through Blackmagic Design DeckLink
   3  * Copyright (C) 2010 Dan Dennedy <dan@dennedy.org>
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2.1 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with consumer library; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18  */
  19
  20 #define __STDC_FORMAT_MACROS  /* see inttypes.h */
  21 #include <framework/mlt.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <pthread.h>
  25 #include <unistd.h>
  26 #include <sys/time.h>
  27 #include <limits.h>
  28 #ifdef WIN32
  29 #include <objbase.h>
  30 #include "DeckLinkAPI_h.h"
  31 #else
  32 #include "DeckLinkAPI.h"
  33 #endif
  34
  35 static const unsigned PREROLL_MINIMUM = 3;
  36
  37 class DeckLinkConsumer
  38         : public IDeckLinkVideoOutputCallback
  39 {
  40 private:
  41         mlt_consumer_s              m_consumer;
  42         IDeckLink*                  m_deckLink;
  43         IDeckLinkOutput*            m_deckLinkOutput;
  44         IDeckLinkDisplayMode*       m_displayMode;
  45         int                         m_width;
  46         int                         m_height;
  47         BMDTimeValue                m_duration;
  48         BMDTimeScale                m_timescale;
  49         double                      m_fps;
  50         uint64_t                    m_count;
  51         int                         m_channels;
  52         unsigned                    m_dropped;
  53         IDeckLinkMutableVideoFrame* m_decklinkFrame;
  54         bool                        m_isAudio;
  55         int                         m_isKeyer;
  56         IDeckLinkKeyer*             m_deckLinkKeyer;
  57         bool                        m_terminate_on_pause;
  58         uint32_t                    m_preroll;
  59         uint32_t                    m_acnt;
  60         bool                        m_reprio;
  61
  62         IDeckLinkDisplayMode* getDisplayMode()
  63         {
  64                 mlt_profile profile = mlt_service_profile( MLT_CONSUMER_SERVICE( getConsumer() ) );
  65                 IDeckLinkDisplayModeIterator* iter;
  66                 IDeckLinkDisplayMode* mode;
  67                 IDeckLinkDisplayMode* result = 0;
  68
  69                 if ( m_deckLinkOutput->GetDisplayModeIterator( &iter ) == S_OK )
  70                 {
  71                         while ( !result && iter->Next( &mode ) == S_OK )
  72                         {
  73                                 m_width = mode->GetWidth();
  74                                 m_height = mode->GetHeight();
  75                                 mode->GetFrameRate( &m_duration, &m_timescale );
  76                                 m_fps = (double) m_timescale / m_duration;
  77                                 int p = mode->GetFieldDominance() == bmdProgressiveFrame;
  78                                 mlt_log_verbose( getConsumer(), "BMD mode %dx%d %.3f fps prog %d\n", m_width, m_height, m_fps, p );
  79
  80                                 if ( m_width == profile->width && m_height == profile->height && p == profile->progressive
  81                                          && m_fps == mlt_profile_fps( profile ) )
  82                                         result = mode;
  83                         }
  84                 }
  85
  86                 return result;
  87         }
  88
  89 public:
  90         mlt_consumer getConsumer()
  91                 { return &m_consumer; }
  92
  93         ~DeckLinkConsumer()
  94         {
  95                 if ( m_deckLinkKeyer )
  96                         m_deckLinkKeyer->Release();
  97                 if ( m_deckLinkOutput )
  98                         m_deckLinkOutput->Release();
  99                 if ( m_deckLink )
 100                         m_deckLink->Release();
 101         }
 102
 103         bool open( unsigned card = 0 )
 104         {
 105                 unsigned i = 0;
 106 #ifdef WIN32
 107                 IDeckLinkIterator* deckLinkIterator = NULL;
 108                 HRESULT result =  CoInitialize( NULL );
 109                 if ( FAILED( result ) )
 110                 {
 111                         mlt_log_error( getConsumer(), "COM initialization failed\n" );
 112                         return false;
 113                 }
 114                 result = CoCreateInstance( CLSID_CDeckLinkIterator, NULL, CLSCTX_ALL, IID_IDeckLinkIterator, (void**) &deckLinkIterator );
 115                 if ( FAILED( result ) )
 116                 {
 117                         mlt_log_error( getConsumer(), "The DeckLink drivers not installed.\n" );
 118                         return false;
 119                 }
 120 #else
 121                 IDeckLinkIterator* deckLinkIterator = CreateDeckLinkIteratorInstance();
 122
 123                 if ( !deckLinkIterator )
 124                 {
 125                         mlt_log_error( getConsumer(), "The DeckLink drivers not installed.\n" );
 126                         return false;
 127                 }
 128 #endif
 129
 130                 // Connect to the Nth DeckLink instance
 131                 do {
 132                         if ( deckLinkIterator->Next( &m_deckLink ) != S_OK )
 133                         {
 134                                 mlt_log_error( getConsumer(), "DeckLink card not found\n" );
 135                                 deckLinkIterator->Release();
 136                                 return false;
 137                         }
 138                 } while ( ++i <= card );
 139                 deckLinkIterator->Release();
 140
 141                 // Obtain the audio/video output interface (IDeckLinkOutput)
 142                 if ( m_deckLink->QueryInterface( IID_IDeckLinkOutput, (void**)&m_deckLinkOutput ) != S_OK )
 143                 {
 144                         mlt_log_error( getConsumer(), "No DeckLink cards support output\n" );
 145                         m_deckLink->Release();
 146                         m_deckLink = 0;
 147                         return false;
 148                 }
 149
 150                 // Get the keyer interface
 151                 IDeckLinkAttributes *deckLinkAttributes = 0;
 152                 m_deckLinkKeyer = 0;
 153                 if ( m_deckLink->QueryInterface( IID_IDeckLinkAttributes, (void**) &deckLinkAttributes ) == S_OK )
 154                 {
 155 #ifdef WIN32
 156                         BOOL flag = FALSE;
 157 #else
 158                         bool flag = false;
 159 #endif
 160                         if ( deckLinkAttributes->GetFlag( BMDDeckLinkSupportsInternalKeying, &flag ) == S_OK && flag )
 161                         {
 162                                 if ( m_deckLink->QueryInterface( IID_IDeckLinkKeyer, (void**) &m_deckLinkKeyer ) != S_OK )
 163                                 {
 164                                         mlt_log_error( getConsumer(), "Failed to get keyer\n" );
 165                                         m_deckLinkOutput->Release();
 166                                         m_deckLinkOutput = 0;
 167                                         m_deckLink->Release();
 168                                         m_deckLink = 0;
 169                                         return false;
 170                                 }
 171                         }
 172                         deckLinkAttributes->Release();
 173                 }
 174
 175                 // Provide this class as a delegate to the audio and video output interfaces
 176                 m_deckLinkOutput->SetScheduledFrameCompletionCallback( this );
 177
 178                 return true;
 179         }
 180
 181         bool start( unsigned preroll )
 182         {
 183                 unsigned i;
 184                 mlt_properties properties = MLT_CONSUMER_PROPERTIES( getConsumer() );
 185
 186                 // Initialize members
 187                 m_count = 0;
 188                 m_dropped = 0;
 189                 m_decklinkFrame = NULL;
 190                 preroll = preroll < PREROLL_MINIMUM ? PREROLL_MINIMUM : preroll;
 191                 m_channels = mlt_properties_get_int( properties, "channels" );
 192                 m_isAudio = !mlt_properties_get_int( properties, "audio_off" );
 193                 m_terminate_on_pause = mlt_properties_get_int( properties, "terminate_on_pause" );
 194
 195
 196                 m_displayMode = getDisplayMode();
 197                 if ( !m_displayMode )
 198                 {
 199                         mlt_log_error( getConsumer(), "Profile is not compatible with decklink.\n" );
 200                         return false;
 201                 }
 202
 203                 // Set the keyer
 204                 if ( m_deckLinkKeyer && ( m_isKeyer = mlt_properties_get_int( properties, "keyer" ) ) )
 205                 {
 206                         bool external = ( m_isKeyer == 2 );
 207                         double level = mlt_properties_get_double( properties, "keyer_level" );
 208
 209                         if ( m_deckLinkKeyer->Enable( external ) != S_OK )
 210                                 mlt_log_error( getConsumer(), "Failed to enable %s keyer\n",
 211                                         external ? "external" : "internal" );
 212                         m_deckLinkKeyer->SetLevel( level <= 1 ? ( level > 0 ? 255 * level : 255 ) : 255 );
 213                 }
 214                 else if ( m_deckLinkKeyer )
 215                 {
 216                         m_deckLinkKeyer->Disable();
 217                 }
 218
 219                 // Set the video output mode
 220                 if ( S_OK != m_deckLinkOutput->EnableVideoOutput( m_displayMode->GetDisplayMode(), bmdVideoOutputFlagDefault ) )
 221                 {
 222                         mlt_log_error( getConsumer(), "Failed to enable video output\n" );
 223                         return false;
 224                 }
 225
 226                 // Set the audio output mode
 227                 if ( !m_isAudio )
 228                 {
 229                         m_deckLinkOutput->DisableAudioOutput();
 230                         return true;
 231                 }
 232                 if ( S_OK != m_deckLinkOutput->EnableAudioOutput( bmdAudioSampleRate48kHz, bmdAudioSampleType16bitInteger,
 233                         m_channels, bmdAudioOutputStreamTimestamped ) )
 234                 {
 235                         mlt_log_error( getConsumer(), "Failed to enable audio output\n" );
 236                         stop();
 237                         return false;
 238                 }
 239
 240                 m_preroll = preroll;
 241                 m_reprio = false;
 242
 243                 // preroll frames
 244                 for( i = 0; i < preroll; i++ )
 245                         ScheduleNextFrame( true );
 246
 247                 // start scheduled playback
 248                 m_deckLinkOutput->StartScheduledPlayback( 0, m_timescale, 1.0 );
 249
 250                 // Set the running state
 251                 mlt_properties_set_int( properties, "running", 1 );
 252
 253                 return true;
 254         }
 255
 256         bool stop()
 257         {
 258                 mlt_properties properties = MLT_CONSUMER_PROPERTIES( getConsumer() );
 259
 260                 // set running state is 0
 261                 mlt_properties_set_int( properties, "running", 0 );
 262                 mlt_consumer_stopped( getConsumer() );
 263
 264                 // release decklink frame
 265                 if ( m_decklinkFrame )
 266                         m_decklinkFrame->Release();
 267                 m_decklinkFrame = NULL;
 268
 269                 // Stop the audio and video output streams immediately
 270                 if ( m_deckLinkOutput )
 271                 {
 272                         m_deckLinkOutput->StopScheduledPlayback( 0, 0, 0 );
 273                         m_deckLinkOutput->DisableAudioOutput();
 274                         m_deckLinkOutput->DisableVideoOutput();
 275                 }
 276
 277                 return true;
 278         }
 279
 280         void renderAudio( mlt_frame frame )
 281         {
 282                 mlt_audio_format format = mlt_audio_s16;
 283                 int frequency = bmdAudioSampleRate48kHz;
 284                 int samples = mlt_sample_calculator( m_fps, frequency, m_count );
 285                 int16_t *pcm = 0;
 286
 287                 if ( !mlt_frame_get_audio( frame, (void**) &pcm, &format, &frequency, &m_channels, &samples ) )
 288                 {
 289 #ifdef WIN32
 290                         unsigned long written = 0;
 291 #else
 292                         uint32_t written = 0;
 293 #endif
 294                         BMDTimeValue streamTime = m_count * frequency * m_duration / m_timescale;
 295                         m_deckLinkOutput->GetBufferedAudioSampleFrameCount( &written );
 296                         if ( written > (m_preroll + 1) * samples )
 297                         {
 298                                 mlt_log_verbose( getConsumer(), "renderAudio: will flush %lu audiosamples\n", written );
 299                                 m_deckLinkOutput->FlushBufferedAudioSamples();
 300                         };
 301 #ifdef WIN32
 302                         m_deckLinkOutput->ScheduleAudioSamples( pcm, samples, streamTime, frequency, (unsigned long*) &written );
 303 #else
 304                         m_deckLinkOutput->ScheduleAudioSamples( pcm, samples, streamTime, frequency, &written );
 305 #endif
 306
 307                         if ( written != (uint32_t) samples )
 308                                 mlt_log_verbose( getConsumer(), "renderAudio: samples=%d, written=%lu\n", samples, written );
 309                 }
 310         }
 311
 312         bool createFrame( IDeckLinkMutableVideoFrame** decklinkFrame )
 313         {
 314                 BMDPixelFormat format = m_isKeyer? bmdFormat8BitARGB : bmdFormat8BitYUV;
 315                 IDeckLinkMutableVideoFrame* frame = 0;
 316                 uint8_t *buffer = 0;
 317                 int stride = m_width * ( m_isKeyer? 4 : 2 );
 318
 319                 *decklinkFrame = NULL;
 320
 321                 // Generate a DeckLink video frame
 322                 if ( S_OK != m_deckLinkOutput->CreateVideoFrame( m_width, m_height,
 323                         stride, format, bmdFrameFlagDefault, &frame ) )
 324                 {
 325                         mlt_log_verbose( getConsumer(), "Failed to create video frame\n" );
 326                         stop();
 327                         return false;
 328                 }
 329
 330                 // Make the first line black for field order correction.
 331                 if ( S_OK == frame->GetBytes( (void**) &buffer ) && buffer )
 332                 {
 333                         if ( m_isKeyer )
 334                         {
 335                                 memset( buffer, 0, stride );
 336                         }
 337                         else for ( int i = 0; i < m_width; i++ )
 338                         {
 339                                 *buffer++ = 128;
 340                                 *buffer++ = 16;
 341                         }
 342                 }
 343
 344                 *decklinkFrame = frame;
 345
 346                 return true;
 347         }
 348
 349         void renderVideo( mlt_frame frame )
 350         {
 351                 mlt_image_format format = m_isKeyer? mlt_image_rgb24a : mlt_image_yuv422;
 352                 uint8_t* image = 0;
 353                 int rendered = mlt_properties_get_int( MLT_FRAME_PROPERTIES(frame), "rendered");
 354
 355                 if ( rendered && !mlt_frame_get_image( frame, &image, &format, &m_width, &m_height, 0 ) )
 356                 {
 357                         uint8_t* buffer = 0;
 358                         int stride = m_width * ( m_isKeyer? 4 : 2 );
 359
 360                         if ( m_decklinkFrame )
 361                                 m_decklinkFrame->Release();
 362                         if ( createFrame( &m_decklinkFrame ) )
 363                                 m_decklinkFrame->GetBytes( (void**) &buffer );
 364
 365                         if ( buffer )
 366                         {
 367                                 int progressive = mlt_properties_get_int( MLT_FRAME_PROPERTIES( frame ), "progressive" );
 368
 369                                 if ( !m_isKeyer )
 370                                 {
 371                                         // Normal non-keyer playout - needs byte swapping
 372                                         if ( !progressive && m_displayMode->GetFieldDominance() == bmdUpperFieldFirst )
 373                                                 // convert lower field first to top field first
 374                                                 swab( (char*) image, (char*) buffer + stride, stride * ( m_height - 1 ) );
 375                                         else
 376                                                 swab( (char*) image, (char*) buffer, stride * m_height );
 377                                 }
 378                                 else if ( !mlt_properties_get_int( MLT_FRAME_PROPERTIES( frame ), "test_image" ) )
 379                                 {
 380                                         // Normal keyer output
 381                                         int y = m_height + 1;
 382                                         uint32_t* s = (uint32_t*) image;
 383                                         uint32_t* d = (uint32_t*) buffer;
 384
 385                                         if ( !progressive && m_displayMode->GetFieldDominance() == bmdUpperFieldFirst )
 386                                         {
 387                                                 // Correct field order
 388                                                 m_height--;
 389                                                 y--;
 390                                                 d += m_width;
 391                                         }
 392
 393                                         // Need to relocate alpha channel RGBA => ARGB
 394                                         while ( --y )
 395                                         {
 396                                                 int x = m_width + 1;
 397                                                 while ( --x )
 398                                                 {
 399                                                         *d++ = ( *s << 8 ) | ( *s >> 24 );
 400                                                         s++;
 401                                                 }
 402                                         }
 403                                 }
 404                                 else
 405                                 {
 406                                         // Keying blank frames - nullify alpha
 407                                         memset( buffer, 0, stride * m_height );
 408                                 }
 409                         }
 410                 }
 411                 if ( m_decklinkFrame )
 412                         m_deckLinkOutput->ScheduleVideoFrame( m_decklinkFrame, m_count * m_duration, m_duration, m_timescale );
 413
 414                 if ( !rendered )
 415                         mlt_log_verbose( getConsumer(), "dropped video frame %u\n", ++m_dropped );
 416         }
 417
 418         HRESULT render( mlt_frame frame )
 419         {
 420                 HRESULT result = S_OK;
 421
 422                 // Get the audio
 423                 double speed = mlt_properties_get_double( MLT_FRAME_PROPERTIES(frame), "_speed" );
 424                 if ( m_isAudio && speed == 1.0 )
 425                         renderAudio( frame );
 426
 427                 // Get the video
 428                 renderVideo( frame );
 429                 ++m_count;
 430
 431                 return result;
 432         }
 433
 434         // *** DeckLink API implementation of IDeckLinkVideoOutputCallback IDeckLinkAudioOutputCallback *** //
 435
 436         // IUnknown needs only a dummy implementation
 437         virtual HRESULT STDMETHODCALLTYPE QueryInterface( REFIID iid, LPVOID *ppv )
 438                 { return E_NOINTERFACE; }
 439         virtual ULONG STDMETHODCALLTYPE AddRef()
 440                 { return 1; }
 441         virtual ULONG STDMETHODCALLTYPE Release()
 442                 { return 1; }
 443
 444         /************************* DeckLink API Delegate Methods *****************************/
 445
 446         virtual HRESULT STDMETHODCALLTYPE ScheduledFrameCompleted( IDeckLinkVideoFrame* completedFrame, BMDOutputFrameCompletionResult completed )
 447         {
 448                 if( !m_reprio )
 449                 {
 450                         mlt_properties properties = MLT_CONSUMER_PROPERTIES( getConsumer() );
 451
 452                         if ( mlt_properties_get( properties, "priority" ) )
 453                         {
 454                                 int r;
 455                                 pthread_t thread;
 456                                 pthread_attr_t tattr;
 457                                 struct sched_param param;
 458
 459                                 pthread_attr_init(&tattr);
 460                                 pthread_attr_setschedpolicy(&tattr, SCHED_FIFO);
 461
 462                                 if ( !strcmp( "max", mlt_properties_get( properties, "priority" ) ) )
 463                                         param.sched_priority = sched_get_priority_max(SCHED_FIFO) - 1;
 464                                 else if ( !strcmp( "min", mlt_properties_get( properties, "priority" ) ) )
 465                                         param.sched_priority = sched_get_priority_min(SCHED_FIFO) + 1;
 466                                 else
 467                                         param.sched_priority = mlt_properties_get_int( properties, "priority" );
 468
 469                                 pthread_attr_setschedparam(&tattr, &param);
 470
 471                                 thread = pthread_self();
 472
 473                                 r = pthread_setschedparam(thread, SCHED_FIFO, &param);
 474                                 if( r )
 475                                         mlt_log_verbose( getConsumer(),
 476                                                 "ScheduledFrameCompleted: pthread_setschedparam retured %d\n", r);
 477                                 else
 478                                         mlt_log_verbose( getConsumer(),
 479                                                 "ScheduledFrameCompleted: param.sched_priority=%d\n", param.sched_priority);
 480                         };
 481
 482                         m_reprio = true;
 483                 };
 484
 485 #ifdef WIN32
 486                 unsigned long cnt;
 487 #else
 488                 uint32_t cnt;
 489 #endif
 490                 m_deckLinkOutput->GetBufferedAudioSampleFrameCount( &cnt );
 491                 if ( cnt != m_acnt )
 492                 {
 493                         mlt_log_verbose( getConsumer(),
 494                                 "ScheduledFrameCompleted: GetBufferedAudioSampleFrameCount %u -> %lu, m_count=%"PRIu64"\n",
 495                                 m_acnt, cnt, m_count );
 496                         m_acnt = cnt;
 497                 }
 498
 499                 // When a video frame has been released by the API, schedule another video frame to be output
 500
 501                 // ignore handler if frame was flushed
 502                 if ( bmdOutputFrameFlushed == completed )
 503                         return S_OK;
 504
 505                 // schedule next frame
 506                 ScheduleNextFrame( false );
 507
 508                 // step forward frames counter if underrun
 509                 if ( bmdOutputFrameDisplayedLate == completed )
 510                 {
 511                         mlt_log_verbose( getConsumer(), "ScheduledFrameCompleted: bmdOutputFrameDisplayedLate == completed\n" );
 512                         m_count++;
 513                 }
 514                 if ( bmdOutputFrameDropped == completed )
 515                 {
 516                         mlt_log_verbose( getConsumer(), "ScheduledFrameCompleted: bmdOutputFrameDropped == completed\n" );
 517                         m_count++;
 518                 }
 519
 520                 return S_OK;
 521         }
 522
 523         virtual HRESULT STDMETHODCALLTYPE ScheduledPlaybackHasStopped()
 524         {
 525                 return mlt_consumer_is_stopped( getConsumer() ) ? S_FALSE : S_OK;
 526         }
 527
 528
 529         void ScheduleNextFrame( bool preroll )
 530         {
 531                 // get the consumer
 532                 mlt_consumer consumer = getConsumer();
 533
 534                 // Get the properties
 535                 mlt_properties properties = MLT_CONSUMER_PROPERTIES( consumer );
 536
 537                 // Frame and size
 538                 mlt_frame frame = NULL;
 539
 540                 if( mlt_properties_get_int( properties, "running" ) || preroll )
 541                 {
 542                         frame = mlt_consumer_rt_frame( consumer );
 543                         if ( frame != NULL )
 544                         {
 545                                 render( frame );
 546
 547                                 mlt_events_fire( properties, "consumer-frame-show", frame, NULL );
 548
 549                                 // terminate on pause
 550                                 if ( m_terminate_on_pause &&
 551                                         mlt_properties_get_double( MLT_FRAME_PROPERTIES( frame ), "_speed" ) == 0.0 )
 552                                         stop();
 553
 554                                 mlt_frame_close( frame );
 555                         }
 556                 }
 557         }
 558 };
 559
 560 /** Start the consumer.
 561  */
 562
 563 static int start( mlt_consumer consumer )
 564 {
 565         // Get the properties
 566         mlt_properties properties = MLT_CONSUMER_PROPERTIES( consumer );
 567         DeckLinkConsumer* decklink = (DeckLinkConsumer*) consumer->child;
 568         return decklink->start( mlt_properties_get_int( properties, "preroll" ) ) ? 0 : 1;
 569 }
 570
 571 /** Stop the consumer.
 572  */
 573
 574 static int stop( mlt_consumer consumer )
 575 {
 576         // Get the properties
 577         DeckLinkConsumer* decklink = (DeckLinkConsumer*) consumer->child;
 578         return decklink->stop();
 579 }
 580
 581 /** Determine if the consumer is stopped.
 582  */
 583
 584 static int is_stopped( mlt_consumer consumer )
 585 {
 586         // Get the properties
 587         mlt_properties properties = MLT_CONSUMER_PROPERTIES( consumer );
 588         return !mlt_properties_get_int( properties, "running" );
 589 }
 590
 591 /** Close the consumer.
 592  */
 593
 594 static void close( mlt_consumer consumer )
 595 {
 596         // Stop the consumer
 597         mlt_consumer_stop( consumer );
 598
 599         // Close the parent
 600         consumer->close = NULL;
 601         mlt_consumer_close( consumer );
 602
 603         // Free the memory
 604         delete (DeckLinkConsumer*) consumer->child;
 605 }
 606
 607 extern "C" {
 608
 609 /** Initialise the consumer.
 610  */
 611
 612 mlt_consumer consumer_decklink_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg )
 613 {
 614         // Allocate the consumer
 615         DeckLinkConsumer* decklink = new DeckLinkConsumer();
 616         mlt_consumer consumer = NULL;
 617
 618         // If allocated
 619         if ( decklink && !mlt_consumer_init( decklink->getConsumer(), decklink, profile ) )
 620         {
 621                 // If initialises without error
 622                 if ( decklink->open( arg? atoi(arg) : 0 ) )
 623                 {
 624                         consumer = decklink->getConsumer();
 625
 626                         // Setup callbacks
 627                         consumer->close = close;
 628                         consumer->start = start;
 629                         consumer->stop = stop;
 630                         consumer->is_stopped = is_stopped;
 631                         mlt_properties_set( MLT_CONSUMER_PROPERTIES(consumer), "deinterlace_method", "onefield" );
 632                 }
 633         }
 634
 635         // Return consumer
 636         return consumer;
 637 }
 638
 639 extern mlt_producer producer_decklink_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg );
 640
 641 static mlt_properties metadata( mlt_service_type type, const char *id, void *data )
 642 {
 643         char file[ PATH_MAX ];
 644         const char *service_type = NULL;
 645         switch ( type )
 646         {
 647                 case consumer_type:
 648                         service_type = "consumer";
 649                         break;
 650                 case producer_type:
 651                         service_type = "producer";
 652                         break;
 653                 default:
 654                         return NULL;
 655         }
 656         snprintf( file, PATH_MAX, "%s/decklink/%s_%s.yml", mlt_environment( "MLT_DATA" ), service_type, id );
 657         return mlt_properties_parse_yaml( file );
 658 }
 659
 660 MLT_REPOSITORY
 661 {
 662         MLT_REGISTER( consumer_type, "decklink", consumer_decklink_init );
 663         MLT_REGISTER( producer_type, "decklink", producer_decklink_init );
 664         MLT_REGISTER_METADATA( consumer_type, "decklink", metadata, NULL );
 665         MLT_REGISTER_METADATA( producer_type, "decklink", metadata, NULL );
 666 }
 667
 668 } // extern C