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 #include <pthread.h>
  29 #ifdef WIN32
  30 #include <objbase.h>
  31 #include "DeckLinkAPI_h.h"
  32 #else
  33 #include "DeckLinkAPI.h"
  34 #endif
  35
  36 static const unsigned PREROLL_MINIMUM = 3;
  37
  38 class DeckLinkConsumer
  39         : public IDeckLinkVideoOutputCallback
  40 {
  41 private:
  42         mlt_consumer_s              m_consumer;
  43         IDeckLink*                  m_deckLink;
  44         IDeckLinkOutput*            m_deckLinkOutput;
  45         IDeckLinkDisplayMode*       m_displayMode;
  46         int                         m_width;
  47         int                         m_height;
  48         BMDTimeValue                m_duration;
  49         BMDTimeScale                m_timescale;
  50         double                      m_fps;
  51         uint64_t                    m_count;
  52         int                         m_channels;
  53         unsigned                    m_dropped;
  54         IDeckLinkMutableVideoFrame* m_decklinkFrame;
  55         bool                        m_isAudio;
  56         int                         m_isKeyer;
  57         IDeckLinkKeyer*             m_deckLinkKeyer;
  58         bool                        m_terminate_on_pause;
  59         uint32_t                    m_preroll;
  60         uint32_t                    m_acnt;
  61         bool                        m_reprio;
  62         pthread_t                   m_prerollThread;
  63
  64         IDeckLinkDisplayMode* getDisplayMode()
  65         {
  66                 mlt_profile profile = mlt_service_profile( MLT_CONSUMER_SERVICE( getConsumer() ) );
  67                 IDeckLinkDisplayModeIterator* iter;
  68                 IDeckLinkDisplayMode* mode;
  69                 IDeckLinkDisplayMode* result = 0;
  70
  71                 if ( m_deckLinkOutput->GetDisplayModeIterator( &iter ) == S_OK )
  72                 {
  73                         while ( !result && iter->Next( &mode ) == S_OK )
  74                         {
  75                                 m_width = mode->GetWidth();
  76                                 m_height = mode->GetHeight();
  77                                 mode->GetFrameRate( &m_duration, &m_timescale );
  78                                 m_fps = (double) m_timescale / m_duration;
  79                                 int p = mode->GetFieldDominance() == bmdProgressiveFrame;
  80                                 mlt_log_verbose( getConsumer(), "BMD mode %dx%d %.3f fps prog %d\n", m_width, m_height, m_fps, p );
  81
  82                                 if ( m_width == profile->width && p == profile->progressive
  83                                          && m_fps == mlt_profile_fps( profile )
  84                                          && ( m_height == profile->height || ( m_height == 486 && profile->height == 480 ) ) )
  85                                         result = mode;
  86                         }
  87                 }
  88
  89                 return result;
  90         }
  91
  92 public:
  93         mlt_consumer getConsumer()
  94                 { return &m_consumer; }
  95
  96         ~DeckLinkConsumer()
  97         {
  98                 if ( m_deckLinkKeyer )
  99                         m_deckLinkKeyer->Release();
 100                 if ( m_deckLinkOutput )
 101                         m_deckLinkOutput->Release();
 102                 if ( m_deckLink )
 103                         m_deckLink->Release();
 104         }
 105
 106         bool open( unsigned card = 0 )
 107         {
 108                 unsigned i = 0;
 109 #ifdef WIN32
 110                 IDeckLinkIterator* deckLinkIterator = NULL;
 111                 HRESULT result =  CoInitialize( NULL );
 112                 if ( FAILED( result ) )
 113                 {
 114                         mlt_log_error( getConsumer(), "COM initialization failed\n" );
 115                         return false;
 116                 }
 117                 result = CoCreateInstance( CLSID_CDeckLinkIterator, NULL, CLSCTX_ALL, IID_IDeckLinkIterator, (void**) &deckLinkIterator );
 118                 if ( FAILED( result ) )
 119                 {
 120                         mlt_log_error( getConsumer(), "The DeckLink drivers not installed.\n" );
 121                         return false;
 122                 }
 123 #else
 124                 IDeckLinkIterator* deckLinkIterator = CreateDeckLinkIteratorInstance();
 125
 126                 if ( !deckLinkIterator )
 127                 {
 128                         mlt_log_error( getConsumer(), "The DeckLink drivers not installed.\n" );
 129                         return false;
 130                 }
 131 #endif
 132
 133                 // Connect to the Nth DeckLink instance
 134                 do {
 135                         if ( deckLinkIterator->Next( &m_deckLink ) != S_OK )
 136                         {
 137                                 mlt_log_error( getConsumer(), "DeckLink card not found\n" );
 138                                 deckLinkIterator->Release();
 139                                 return false;
 140                         }
 141                 } while ( ++i <= card );
 142                 deckLinkIterator->Release();
 143
 144                 // Obtain the audio/video output interface (IDeckLinkOutput)
 145                 if ( m_deckLink->QueryInterface( IID_IDeckLinkOutput, (void**)&m_deckLinkOutput ) != S_OK )
 146                 {
 147                         mlt_log_error( getConsumer(), "No DeckLink cards support output\n" );
 148                         m_deckLink->Release();
 149                         m_deckLink = 0;
 150                         return false;
 151                 }
 152
 153                 // Get the keyer interface
 154                 IDeckLinkAttributes *deckLinkAttributes = 0;
 155                 m_deckLinkKeyer = 0;
 156                 if ( m_deckLink->QueryInterface( IID_IDeckLinkAttributes, (void**) &deckLinkAttributes ) == S_OK )
 157                 {
 158 #ifdef WIN32
 159                         BOOL flag = FALSE;
 160 #else
 161                         bool flag = false;
 162 #endif
 163                         if ( deckLinkAttributes->GetFlag( BMDDeckLinkSupportsInternalKeying, &flag ) == S_OK && flag )
 164                         {
 165                                 if ( m_deckLink->QueryInterface( IID_IDeckLinkKeyer, (void**) &m_deckLinkKeyer ) != S_OK )
 166                                 {
 167                                         mlt_log_error( getConsumer(), "Failed to get keyer\n" );
 168                                         m_deckLinkOutput->Release();
 169                                         m_deckLinkOutput = 0;
 170                                         m_deckLink->Release();
 171                                         m_deckLink = 0;
 172                                         return false;
 173                                 }
 174                         }
 175                         deckLinkAttributes->Release();
 176                 }
 177
 178                 // Provide this class as a delegate to the audio and video output interfaces
 179                 m_deckLinkOutput->SetScheduledFrameCompletionCallback( this );
 180
 181                 return true;
 182         }
 183
 184
 185         void* preroll_thread()
 186         {
 187                 // preroll frames
 188                 for ( unsigned i = 0; i < m_preroll; i++ )
 189                         ScheduleNextFrame( true );
 190
 191                 // start scheduled playback
 192                 m_deckLinkOutput->StartScheduledPlayback( 0, m_timescale, 1.0 );
 193
 194                 return 0;
 195         }
 196
 197         static void* preroll_thread_proxy( void* arg )
 198         {
 199                 DeckLinkConsumer* self = static_cast< DeckLinkConsumer* >( arg );
 200                 return self->preroll_thread();
 201         }
 202
 203         bool start( unsigned preroll )
 204         {
 205                 mlt_properties properties = MLT_CONSUMER_PROPERTIES( getConsumer() );
 206
 207                 // Initialize members
 208                 m_count = 0;
 209                 m_dropped = 0;
 210                 m_decklinkFrame = NULL;
 211                 preroll = preroll < PREROLL_MINIMUM ? PREROLL_MINIMUM : preroll;
 212                 m_channels = mlt_properties_get_int( properties, "channels" );
 213                 m_isAudio = !mlt_properties_get_int( properties, "audio_off" );
 214                 m_terminate_on_pause = mlt_properties_get_int( properties, "terminate_on_pause" );
 215
 216
 217                 m_displayMode = getDisplayMode();
 218                 if ( !m_displayMode )
 219                 {
 220                         mlt_log_error( getConsumer(), "Profile is not compatible with decklink.\n" );
 221                         return false;
 222                 }
 223
 224                 // Set the keyer
 225                 if ( m_deckLinkKeyer && ( m_isKeyer = mlt_properties_get_int( properties, "keyer" ) ) )
 226                 {
 227                         bool external = ( m_isKeyer == 2 );
 228                         double level = mlt_properties_get_double( properties, "keyer_level" );
 229
 230                         if ( m_deckLinkKeyer->Enable( external ) != S_OK )
 231                                 mlt_log_error( getConsumer(), "Failed to enable %s keyer\n",
 232                                         external ? "external" : "internal" );
 233                         m_deckLinkKeyer->SetLevel( level <= 1 ? ( level > 0 ? 255 * level : 255 ) : 255 );
 234                 }
 235                 else if ( m_deckLinkKeyer )
 236                 {
 237                         m_deckLinkKeyer->Disable();
 238                 }
 239
 240                 // Set the video output mode
 241                 if ( S_OK != m_deckLinkOutput->EnableVideoOutput( m_displayMode->GetDisplayMode(), bmdVideoOutputFlagDefault ) )
 242                 {
 243                         mlt_log_error( getConsumer(), "Failed to enable video output\n" );
 244                         return false;
 245                 }
 246
 247                 // Set the audio output mode
 248                 if ( !m_isAudio )
 249                 {
 250                         m_deckLinkOutput->DisableAudioOutput();
 251                         return true;
 252                 }
 253                 if ( S_OK != m_deckLinkOutput->EnableAudioOutput( bmdAudioSampleRate48kHz, bmdAudioSampleType16bitInteger,
 254                         m_channels, bmdAudioOutputStreamTimestamped ) )
 255                 {
 256                         mlt_log_error( getConsumer(), "Failed to enable audio output\n" );
 257                         stop();
 258                         return false;
 259                 }
 260
 261                 m_preroll = preroll;
 262                 m_reprio = false;
 263
 264                 // Do preroll in thread to ensure asynchronicity of mlt_consumer_start().
 265                 pthread_create( &m_prerollThread, NULL, preroll_thread_proxy, this );
 266
 267                 // Set the running state
 268                 mlt_properties_set_int( properties, "running", 1 );
 269
 270                 return true;
 271         }
 272
 273         bool stop()
 274         {
 275                 mlt_properties properties = MLT_CONSUMER_PROPERTIES( getConsumer() );
 276                 bool wasRunning = !!mlt_properties_get_int( properties, "running" );
 277
 278                 // set running state is 0
 279                 mlt_properties_set_int( properties, "running", 0 );
 280                 mlt_consumer_stopped( getConsumer() );
 281
 282                 // Stop the audio and video output streams immediately
 283                 if ( m_deckLinkOutput )
 284                 {
 285                         m_deckLinkOutput->StopScheduledPlayback( 0, 0, 0 );
 286                         m_deckLinkOutput->DisableAudioOutput();
 287                         m_deckLinkOutput->DisableVideoOutput();
 288                 }
 289
 290                 // release decklink frame
 291                 if ( m_decklinkFrame )
 292                         m_decklinkFrame->Release();
 293                 m_decklinkFrame = NULL;
 294
 295                 if ( wasRunning )
 296                         pthread_join( m_prerollThread, NULL );
 297
 298                 return true;
 299         }
 300
 301         void renderAudio( mlt_frame frame )
 302         {
 303                 mlt_audio_format format = mlt_audio_s16;
 304                 int frequency = bmdAudioSampleRate48kHz;
 305                 int samples = mlt_sample_calculator( m_fps, frequency, m_count );
 306                 int16_t *pcm = 0;
 307
 308                 if ( !mlt_frame_get_audio( frame, (void**) &pcm, &format, &frequency, &m_channels, &samples ) )
 309                 {
 310 #ifdef WIN32
 311                         unsigned long written = 0;
 312 #else
 313                         uint32_t written = 0;
 314 #endif
 315                         BMDTimeValue streamTime = m_count * frequency * m_duration / m_timescale;
 316                         m_deckLinkOutput->GetBufferedAudioSampleFrameCount( &written );
 317                         if ( written > (m_preroll + 1) * samples )
 318                         {
 319                                 mlt_log_verbose( getConsumer(), "renderAudio: will flush %lu audiosamples\n", written );
 320                                 m_deckLinkOutput->FlushBufferedAudioSamples();
 321                         };
 322 #ifdef WIN32
 323                         m_deckLinkOutput->ScheduleAudioSamples( pcm, samples, streamTime, frequency, (unsigned long*) &written );
 324 #else
 325                         m_deckLinkOutput->ScheduleAudioSamples( pcm, samples, streamTime, frequency, &written );
 326 #endif
 327
 328                         if ( written != (uint32_t) samples )
 329                                 mlt_log_verbose( getConsumer(), "renderAudio: samples=%d, written=%lu\n", samples, written );
 330                 }
 331         }
 332
 333         bool createFrame( IDeckLinkMutableVideoFrame** decklinkFrame )
 334         {
 335                 BMDPixelFormat format = m_isKeyer? bmdFormat8BitARGB : bmdFormat8BitYUV;
 336                 IDeckLinkMutableVideoFrame* frame = 0;
 337                 uint8_t *buffer = 0;
 338                 int stride = m_width * ( m_isKeyer? 4 : 2 );
 339
 340                 *decklinkFrame = NULL;
 341
 342                 // Generate a DeckLink video frame
 343                 if ( S_OK != m_deckLinkOutput->CreateVideoFrame( m_width, m_height,
 344                         stride, format, bmdFrameFlagDefault, &frame ) )
 345                 {
 346                         mlt_log_verbose( getConsumer(), "Failed to create video frame\n" );
 347                         stop();
 348                         return false;
 349                 }
 350
 351                 // Make the first line black for field order correction.
 352                 if ( S_OK == frame->GetBytes( (void**) &buffer ) && buffer )
 353                 {
 354                         if ( m_isKeyer )
 355                         {
 356                                 memset( buffer, 0, stride );
 357                         }
 358                         else for ( int i = 0; i < m_width; i++ )
 359                         {
 360                                 *buffer++ = 128;
 361                                 *buffer++ = 16;
 362                         }
 363                 }
 364
 365                 *decklinkFrame = frame;
 366
 367                 return true;
 368         }
 369
 370         void renderVideo( mlt_frame frame )
 371         {
 372                 mlt_image_format format = m_isKeyer? mlt_image_rgb24a : mlt_image_yuv422;
 373                 uint8_t* image = 0;
 374                 int rendered = mlt_properties_get_int( MLT_FRAME_PROPERTIES(frame), "rendered");
 375                 int height = m_height;
 376
 377                 if ( rendered && !mlt_frame_get_image( frame, &image, &format, &m_width, &height, 0 ) )
 378                 {
 379                         uint8_t* buffer = 0;
 380                         int stride = m_width * ( m_isKeyer? 4 : 2 );
 381
 382                         if ( m_decklinkFrame )
 383                                 m_decklinkFrame->Release();
 384                         if ( createFrame( &m_decklinkFrame ) )
 385                                 m_decklinkFrame->GetBytes( (void**) &buffer );
 386
 387                         if ( buffer )
 388                         {
 389                                 int progressive = mlt_properties_get_int( MLT_FRAME_PROPERTIES( frame ), "progressive" );
 390
 391                                 // NTSC SDI is always 486 lines
 392                                 if ( m_height == 486 && height == 480 )
 393                                 {
 394                                         // blank first 6 lines
 395                                         if ( m_isKeyer )
 396                                         {
 397                                                 memset( buffer, 0, stride * 6 );
 398                                                 buffer += stride * 6;
 399                                         }
 400                                         else for ( int i = 0; i < m_width * 6; i++ )
 401                                         {
 402                                                 *buffer++ = 128;
 403                                                 *buffer++ = 16;
 404                                         }
 405                                 }
 406                                 if ( !m_isKeyer )
 407                                 {
 408                                         // Normal non-keyer playout - needs byte swapping
 409                                         if ( !progressive && m_displayMode->GetFieldDominance() == bmdUpperFieldFirst )
 410                                                 // convert lower field first to top field first
 411                                                 swab( (char*) image, (char*) buffer + stride, stride * ( height - 1 ) );
 412                                         else
 413                                                 swab( (char*) image, (char*) buffer, stride * height );
 414                                 }
 415                                 else if ( !mlt_properties_get_int( MLT_FRAME_PROPERTIES( frame ), "test_image" ) )
 416                                 {
 417                                         // Normal keyer output
 418                                         int y = height + 1;
 419                                         uint32_t* s = (uint32_t*) image;
 420                                         uint32_t* d = (uint32_t*) buffer;
 421
 422                                         if ( !progressive && m_displayMode->GetFieldDominance() == bmdUpperFieldFirst )
 423                                         {
 424                                                 // Correct field order
 425                                                 height--;
 426                                                 y--;
 427                                                 d += m_width;
 428                                         }
 429
 430                                         // Need to relocate alpha channel RGBA => ARGB
 431                                         while ( --y )
 432                                         {
 433                                                 int x = m_width + 1;
 434                                                 while ( --x )
 435                                                 {
 436                                                         *d++ = ( *s << 8 ) | ( *s >> 24 );
 437                                                         s++;
 438                                                 }
 439                                         }
 440                                 }
 441                                 else
 442                                 {
 443                                         // Keying blank frames - nullify alpha
 444                                         memset( buffer, 0, stride * height );
 445                                 }
 446                         }
 447                 }
 448                 if ( m_decklinkFrame )
 449                         m_deckLinkOutput->ScheduleVideoFrame( m_decklinkFrame, m_count * m_duration, m_duration, m_timescale );
 450
 451                 if ( !rendered )
 452                         mlt_log_verbose( getConsumer(), "dropped video frame %u\n", ++m_dropped );
 453         }
 454
 455         HRESULT render( mlt_frame frame )
 456         {
 457                 HRESULT result = S_OK;
 458
 459                 // Get the audio
 460                 double speed = mlt_properties_get_double( MLT_FRAME_PROPERTIES(frame), "_speed" );
 461                 if ( m_isAudio && speed == 1.0 )
 462                         renderAudio( frame );
 463
 464                 // Get the video
 465                 renderVideo( frame );
 466                 ++m_count;
 467
 468                 return result;
 469         }
 470
 471         // *** DeckLink API implementation of IDeckLinkVideoOutputCallback IDeckLinkAudioOutputCallback *** //
 472
 473         // IUnknown needs only a dummy implementation
 474         virtual HRESULT STDMETHODCALLTYPE QueryInterface( REFIID iid, LPVOID *ppv )
 475                 { return E_NOINTERFACE; }
 476         virtual ULONG STDMETHODCALLTYPE AddRef()
 477                 { return 1; }
 478         virtual ULONG STDMETHODCALLTYPE Release()
 479                 { return 1; }
 480
 481         /************************* DeckLink API Delegate Methods *****************************/
 482
 483         virtual HRESULT STDMETHODCALLTYPE ScheduledFrameCompleted( IDeckLinkVideoFrame* completedFrame, BMDOutputFrameCompletionResult completed )
 484         {
 485                 if( !m_reprio )
 486                 {
 487                         mlt_properties properties = MLT_CONSUMER_PROPERTIES( getConsumer() );
 488
 489                         if ( mlt_properties_get( properties, "priority" ) )
 490                         {
 491                                 int r;
 492                                 pthread_t thread;
 493                                 pthread_attr_t tattr;
 494                                 struct sched_param param;
 495
 496                                 pthread_attr_init(&tattr);
 497                                 pthread_attr_setschedpolicy(&tattr, SCHED_FIFO);
 498
 499                                 if ( !strcmp( "max", mlt_properties_get( properties, "priority" ) ) )
 500                                         param.sched_priority = sched_get_priority_max(SCHED_FIFO) - 1;
 501                                 else if ( !strcmp( "min", mlt_properties_get( properties, "priority" ) ) )
 502                                         param.sched_priority = sched_get_priority_min(SCHED_FIFO) + 1;
 503                                 else
 504                                         param.sched_priority = mlt_properties_get_int( properties, "priority" );
 505
 506                                 pthread_attr_setschedparam(&tattr, &param);
 507
 508                                 thread = pthread_self();
 509
 510                                 r = pthread_setschedparam(thread, SCHED_FIFO, &param);
 511                                 if( r )
 512                                         mlt_log_verbose( getConsumer(),
 513                                                 "ScheduledFrameCompleted: pthread_setschedparam returned %d\n", r);
 514                                 else
 515                                         mlt_log_verbose( getConsumer(),
 516                                                 "ScheduledFrameCompleted: param.sched_priority=%d\n", param.sched_priority);
 517                         };
 518
 519                         m_reprio = true;
 520                 };
 521
 522 #ifdef WIN32
 523                 unsigned long cnt;
 524 #else
 525                 uint32_t cnt;
 526 #endif
 527                 m_deckLinkOutput->GetBufferedAudioSampleFrameCount( &cnt );
 528                 if ( cnt != m_acnt )
 529                 {
 530                         mlt_log_debug( getConsumer(),
 531                                 "ScheduledFrameCompleted: GetBufferedAudioSampleFrameCount %u -> %lu, m_count=%"PRIu64"\n",
 532                                 m_acnt, cnt, m_count );
 533                         m_acnt = cnt;
 534                 }
 535
 536                 // When a video frame has been released by the API, schedule another video frame to be output
 537
 538                 // ignore handler if frame was flushed
 539                 if ( bmdOutputFrameFlushed == completed )
 540                         return S_OK;
 541
 542                 // schedule next frame
 543                 ScheduleNextFrame( false );
 544
 545                 // step forward frames counter if underrun
 546                 if ( bmdOutputFrameDisplayedLate == completed )
 547                 {
 548                         mlt_log_verbose( getConsumer(), "ScheduledFrameCompleted: bmdOutputFrameDisplayedLate == completed\n" );
 549                         m_count++;
 550                 }
 551                 if ( bmdOutputFrameDropped == completed )
 552                 {
 553                         mlt_log_verbose( getConsumer(), "ScheduledFrameCompleted: bmdOutputFrameDropped == completed\n" );
 554                         m_count++;
 555                 }
 556
 557                 return S_OK;
 558         }
 559
 560         virtual HRESULT STDMETHODCALLTYPE ScheduledPlaybackHasStopped()
 561         {
 562                 return mlt_consumer_is_stopped( getConsumer() ) ? S_FALSE : S_OK;
 563         }
 564
 565
 566         void ScheduleNextFrame( bool preroll )
 567         {
 568                 // get the consumer
 569                 mlt_consumer consumer = getConsumer();
 570
 571                 // Get the properties
 572                 mlt_properties properties = MLT_CONSUMER_PROPERTIES( consumer );
 573
 574                 // Frame and size
 575                 mlt_frame frame = NULL;
 576
 577                 if( mlt_properties_get_int( properties, "running" ) || preroll )
 578                 {
 579                         frame = mlt_consumer_rt_frame( consumer );
 580                         if ( frame != NULL )
 581                         {
 582                                 render( frame );
 583
 584                                 mlt_events_fire( properties, "consumer-frame-show", frame, NULL );
 585
 586                                 // terminate on pause
 587                                 if ( m_terminate_on_pause &&
 588                                         mlt_properties_get_double( MLT_FRAME_PROPERTIES( frame ), "_speed" ) == 0.0 )
 589                                         stop();
 590
 591                                 mlt_frame_close( frame );
 592                         }
 593                 }
 594         }
 595 };
 596
 597 /** Start the consumer.
 598  */
 599
 600 static int start( mlt_consumer consumer )
 601 {
 602         // Get the properties
 603         mlt_properties properties = MLT_CONSUMER_PROPERTIES( consumer );
 604         DeckLinkConsumer* decklink = (DeckLinkConsumer*) consumer->child;
 605         return decklink->start( mlt_properties_get_int( properties, "preroll" ) ) ? 0 : 1;
 606 }
 607
 608 /** Stop the consumer.
 609  */
 610
 611 static int stop( mlt_consumer consumer )
 612 {
 613         // Get the properties
 614         DeckLinkConsumer* decklink = (DeckLinkConsumer*) consumer->child;
 615         return decklink->stop();
 616 }
 617
 618 /** Determine if the consumer is stopped.
 619  */
 620
 621 static int is_stopped( mlt_consumer consumer )
 622 {
 623         // Get the properties
 624         mlt_properties properties = MLT_CONSUMER_PROPERTIES( consumer );
 625         return !mlt_properties_get_int( properties, "running" );
 626 }
 627
 628 /** Close the consumer.
 629  */
 630
 631 static void close( mlt_consumer consumer )
 632 {
 633         // Stop the consumer
 634         mlt_consumer_stop( consumer );
 635
 636         // Close the parent
 637         consumer->close = NULL;
 638         mlt_consumer_close( consumer );
 639
 640         // Free the memory
 641         delete (DeckLinkConsumer*) consumer->child;
 642 }
 643
 644 extern "C" {
 645
 646 /** Initialise the consumer.
 647  */
 648
 649 mlt_consumer consumer_decklink_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg )
 650 {
 651         // Allocate the consumer
 652         DeckLinkConsumer* decklink = new DeckLinkConsumer();
 653         mlt_consumer consumer = NULL;
 654
 655         // If allocated
 656         if ( decklink && !mlt_consumer_init( decklink->getConsumer(), decklink, profile ) )
 657         {
 658                 // If initialises without error
 659                 if ( decklink->open( arg? atoi(arg) : 0 ) )
 660                 {
 661                         consumer = decklink->getConsumer();
 662
 663                         // Setup callbacks
 664                         consumer->close = close;
 665                         consumer->start = start;
 666                         consumer->stop = stop;
 667                         consumer->is_stopped = is_stopped;
 668                         mlt_properties_set( MLT_CONSUMER_PROPERTIES(consumer), "deinterlace_method", "onefield" );
 669                 }
 670         }
 671
 672         // Return consumer
 673         return consumer;
 674 }
 675
 676 extern mlt_producer producer_decklink_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg );
 677
 678 static mlt_properties metadata( mlt_service_type type, const char *id, void *data )
 679 {
 680         char file[ PATH_MAX ];
 681         const char *service_type = NULL;
 682         switch ( type )
 683         {
 684                 case consumer_type:
 685                         service_type = "consumer";
 686                         break;
 687                 case producer_type:
 688                         service_type = "producer";
 689                         break;
 690                 default:
 691                         return NULL;
 692         }
 693         snprintf( file, PATH_MAX, "%s/decklink/%s_%s.yml", mlt_environment( "MLT_DATA" ), service_type, id );
 694         return mlt_properties_parse_yaml( file );
 695 }
 696
 697 MLT_REPOSITORY
 698 {
 699         MLT_REGISTER( consumer_type, "decklink", consumer_decklink_init );
 700         MLT_REGISTER( producer_type, "decklink", producer_decklink_init );
 701         MLT_REGISTER_METADATA( consumer_type, "decklink", metadata, NULL );
 702         MLT_REGISTER_METADATA( producer_type, "decklink", metadata, NULL );
 703 }
 704
 705 } // extern C