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 #include "common.h"
  30
  31 static const unsigned PREROLL_MINIMUM = 3;
  32
  33 class DeckLinkConsumer
  34         : public IDeckLinkVideoOutputCallback
  35 {
  36 private:
  37         mlt_consumer_s              m_consumer;
  38         IDeckLink*                  m_deckLink;
  39         IDeckLinkOutput*            m_deckLinkOutput;
  40         IDeckLinkDisplayMode*       m_displayMode;
  41         int                         m_width;
  42         int                         m_height;
  43         BMDTimeValue                m_duration;
  44         BMDTimeScale                m_timescale;
  45         double                      m_fps;
  46         uint64_t                    m_count;
  47         int                         m_channels;
  48         unsigned                    m_dropped;
  49         IDeckLinkMutableVideoFrame* m_decklinkFrame;
  50         bool                        m_isAudio;
  51         int                         m_isKeyer;
  52         IDeckLinkKeyer*             m_deckLinkKeyer;
  53         bool                        m_terminate_on_pause;
  54         uint32_t                    m_preroll;
  55         uint32_t                    m_acnt;
  56         bool                        m_reprio;
  57         pthread_t                   m_prerollThread;
  58
  59         IDeckLinkDisplayMode* getDisplayMode()
  60         {
  61                 mlt_profile profile = mlt_service_profile( MLT_CONSUMER_SERVICE( getConsumer() ) );
  62                 IDeckLinkDisplayModeIterator* iter = NULL;
  63                 IDeckLinkDisplayMode* mode = NULL;
  64                 IDeckLinkDisplayMode* result = 0;
  65
  66                 if ( m_deckLinkOutput->GetDisplayModeIterator( &iter ) == S_OK )
  67                 {
  68                         while ( !result && iter->Next( &mode ) == S_OK )
  69                         {
  70                                 m_width = mode->GetWidth();
  71                                 m_height = mode->GetHeight();
  72                                 mode->GetFrameRate( &m_duration, &m_timescale );
  73                                 m_fps = (double) m_timescale / m_duration;
  74                                 int p = mode->GetFieldDominance() == bmdProgressiveFrame;
  75                                 mlt_log_verbose( getConsumer(), "BMD mode %dx%d %.3f fps prog %d\n", m_width, m_height, m_fps, p );
  76
  77                                 if ( m_width == profile->width && p == profile->progressive
  78                                          && m_fps == mlt_profile_fps( profile )
  79                                          && ( m_height == profile->height || ( m_height == 486 && profile->height == 480 ) ) )
  80                                         result = mode;
  81                                 else
  82                                         SAFE_RELEASE( mode );
  83                         }
  84                         SAFE_RELEASE( iter );
  85                 }
  86
  87                 return result;
  88         }
  89
  90 public:
  91         mlt_consumer getConsumer()
  92                 { return &m_consumer; }
  93
  94         DeckLinkConsumer()
  95         {
  96                 m_displayMode = NULL;
  97                 m_deckLinkKeyer = NULL;
  98                 m_deckLinkOutput = NULL;
  99                 m_deckLink = NULL;
 100                 m_decklinkFrame = NULL;
 101         }
 102
 103         ~DeckLinkConsumer()
 104         {
 105                 SAFE_RELEASE( m_displayMode );
 106                 SAFE_RELEASE( m_deckLinkKeyer );
 107                 SAFE_RELEASE( m_deckLinkOutput );
 108                 SAFE_RELEASE( m_deckLink );
 109         }
 110
 111         bool open( unsigned card = 0 )
 112         {
 113                 unsigned i = 0;
 114 #ifdef WIN32
 115                 IDeckLinkIterator* deckLinkIterator = NULL;
 116                 HRESULT result =  CoInitialize( NULL );
 117                 if ( FAILED( result ) )
 118                 {
 119                         mlt_log_error( getConsumer(), "COM initialization failed\n" );
 120                         return false;
 121                 }
 122                 result = CoCreateInstance( CLSID_CDeckLinkIterator, NULL, CLSCTX_ALL, IID_IDeckLinkIterator, (void**) &deckLinkIterator );
 123                 if ( FAILED( result ) )
 124                 {
 125                         mlt_log_error( getConsumer(), "The DeckLink drivers not installed.\n" );
 126                         return false;
 127                 }
 128 #else
 129                 IDeckLinkIterator* deckLinkIterator = CreateDeckLinkIteratorInstance();
 130
 131                 if ( !deckLinkIterator )
 132                 {
 133                         mlt_log_error( getConsumer(), "The DeckLink drivers not installed.\n" );
 134                         return false;
 135                 }
 136 #endif
 137
 138                 // Connect to the Nth DeckLink instance
 139                 for ( i = 0; deckLinkIterator->Next( &m_deckLink ) == S_OK ; i++)
 140                 {
 141                         if( i == card )
 142                                 break;
 143                         else
 144                                 SAFE_RELEASE( m_deckLink );
 145                 }
 146                 SAFE_RELEASE( deckLinkIterator );
 147                 if ( !m_deckLink )
 148                 {
 149                         mlt_log_error( getConsumer(), "DeckLink card not found\n" );
 150                         return false;
 151                 }
 152
 153                 // Obtain the audio/video output interface (IDeckLinkOutput)
 154                 if ( m_deckLink->QueryInterface( IID_IDeckLinkOutput, (void**)&m_deckLinkOutput ) != S_OK )
 155                 {
 156                         mlt_log_error( getConsumer(), "No DeckLink cards support output\n" );
 157                         SAFE_RELEASE( m_deckLink );
 158                         return false;
 159                 }
 160
 161                 // Get the keyer interface
 162                 IDeckLinkAttributes *deckLinkAttributes = 0;
 163                 if ( m_deckLink->QueryInterface( IID_IDeckLinkAttributes, (void**) &deckLinkAttributes ) == S_OK )
 164                 {
 165 #ifdef WIN32
 166                         BOOL flag = FALSE;
 167 #else
 168                         bool flag = false;
 169 #endif
 170                         if ( deckLinkAttributes->GetFlag( BMDDeckLinkSupportsInternalKeying, &flag ) == S_OK && flag )
 171                         {
 172                                 if ( m_deckLink->QueryInterface( IID_IDeckLinkKeyer, (void**) &m_deckLinkKeyer ) != S_OK )
 173                                 {
 174                                         mlt_log_error( getConsumer(), "Failed to get keyer\n" );
 175                                         SAFE_RELEASE( m_deckLinkOutput );
 176                                         SAFE_RELEASE( m_deckLink );
 177                                         return false;
 178                                 }
 179                         }
 180                         SAFE_RELEASE( deckLinkAttributes );
 181                 }
 182
 183                 // Provide this class as a delegate to the audio and video output interfaces
 184                 m_deckLinkOutput->SetScheduledFrameCompletionCallback( this );
 185
 186                 return true;
 187         }
 188
 189
 190         void* preroll_thread()
 191         {
 192                 // preroll frames
 193                 for ( unsigned i = 0; i < m_preroll; i++ )
 194                         ScheduleNextFrame( true );
 195
 196                 // start scheduled playback
 197                 m_deckLinkOutput->StartScheduledPlayback( 0, m_timescale, 1.0 );
 198
 199                 return 0;
 200         }
 201
 202         static void* preroll_thread_proxy( void* arg )
 203         {
 204                 DeckLinkConsumer* self = static_cast< DeckLinkConsumer* >( arg );
 205                 return self->preroll_thread();
 206         }
 207
 208         bool start( unsigned preroll )
 209         {
 210                 mlt_properties properties = MLT_CONSUMER_PROPERTIES( getConsumer() );
 211
 212                 // Initialize members
 213                 m_count = 0;
 214                 m_dropped = 0;
 215                 m_decklinkFrame = NULL;
 216                 preroll = preroll < PREROLL_MINIMUM ? PREROLL_MINIMUM : preroll;
 217                 m_channels = mlt_properties_get_int( properties, "channels" );
 218                 m_isAudio = !mlt_properties_get_int( properties, "audio_off" );
 219                 m_terminate_on_pause = mlt_properties_get_int( properties, "terminate_on_pause" );
 220
 221
 222                 m_displayMode = getDisplayMode();
 223                 if ( !m_displayMode )
 224                 {
 225                         mlt_log_error( getConsumer(), "Profile is not compatible with decklink.\n" );
 226                         return false;
 227                 }
 228
 229                 // Set the keyer
 230                 if ( m_deckLinkKeyer && ( m_isKeyer = mlt_properties_get_int( properties, "keyer" ) ) )
 231                 {
 232                         bool external = ( m_isKeyer == 2 );
 233                         double level = mlt_properties_get_double( properties, "keyer_level" );
 234
 235                         if ( m_deckLinkKeyer->Enable( external ) != S_OK )
 236                                 mlt_log_error( getConsumer(), "Failed to enable %s keyer\n",
 237                                         external ? "external" : "internal" );
 238                         m_deckLinkKeyer->SetLevel( level <= 1 ? ( level > 0 ? 255 * level : 255 ) : 255 );
 239                 }
 240                 else if ( m_deckLinkKeyer )
 241                 {
 242                         m_deckLinkKeyer->Disable();
 243                 }
 244
 245                 // Set the video output mode
 246                 if ( S_OK != m_deckLinkOutput->EnableVideoOutput( m_displayMode->GetDisplayMode(), bmdVideoOutputFlagDefault ) )
 247                 {
 248                         mlt_log_error( getConsumer(), "Failed to enable video output\n" );
 249                         return false;
 250                 }
 251
 252                 // Set the audio output mode
 253                 if ( !m_isAudio )
 254                 {
 255                         m_deckLinkOutput->DisableAudioOutput();
 256                         return true;
 257                 }
 258                 if ( S_OK != m_deckLinkOutput->EnableAudioOutput( bmdAudioSampleRate48kHz, bmdAudioSampleType16bitInteger,
 259                         m_channels, bmdAudioOutputStreamTimestamped ) )
 260                 {
 261                         mlt_log_error( getConsumer(), "Failed to enable audio output\n" );
 262                         stop();
 263                         return false;
 264                 }
 265
 266                 m_preroll = preroll;
 267                 m_reprio = false;
 268
 269                 // Do preroll in thread to ensure asynchronicity of mlt_consumer_start().
 270                 pthread_create( &m_prerollThread, NULL, preroll_thread_proxy, this );
 271
 272                 // Set the running state
 273                 mlt_properties_set_int( properties, "running", 1 );
 274
 275                 return true;
 276         }
 277
 278         bool stop()
 279         {
 280                 mlt_properties properties = MLT_CONSUMER_PROPERTIES( getConsumer() );
 281                 bool wasRunning = !!mlt_properties_get_int( properties, "running" );
 282
 283                 // set running state is 0
 284                 mlt_properties_set_int( properties, "running", 0 );
 285                 mlt_consumer_stopped( getConsumer() );
 286
 287                 // Stop the audio and video output streams immediately
 288                 if ( m_deckLinkOutput )
 289                 {
 290                         m_deckLinkOutput->StopScheduledPlayback( 0, 0, 0 );
 291                         m_deckLinkOutput->DisableAudioOutput();
 292                         m_deckLinkOutput->DisableVideoOutput();
 293                 }
 294
 295                 // release decklink frame
 296                 SAFE_RELEASE( m_decklinkFrame );
 297
 298                 if ( wasRunning )
 299                         pthread_join( m_prerollThread, NULL );
 300
 301                 return true;
 302         }
 303
 304         void renderAudio( mlt_frame frame )
 305         {
 306                 mlt_audio_format format = mlt_audio_s16;
 307                 int frequency = bmdAudioSampleRate48kHz;
 308                 int samples = mlt_sample_calculator( m_fps, frequency, m_count );
 309                 int16_t *pcm = 0;
 310
 311                 if ( !mlt_frame_get_audio( frame, (void**) &pcm, &format, &frequency, &m_channels, &samples ) )
 312                 {
 313 #ifdef WIN32
 314                         unsigned long written = 0;
 315 #else
 316                         uint32_t written = 0;
 317 #endif
 318                         BMDTimeValue streamTime = m_count * frequency * m_duration / m_timescale;
 319                         m_deckLinkOutput->GetBufferedAudioSampleFrameCount( &written );
 320                         if ( written > (m_preroll + 1) * samples )
 321                         {
 322                                 mlt_log_verbose( getConsumer(), "renderAudio: will flush %lu audiosamples\n", written );
 323                                 m_deckLinkOutput->FlushBufferedAudioSamples();
 324                         };
 325 #ifdef WIN32
 326                         m_deckLinkOutput->ScheduleAudioSamples( pcm, samples, streamTime, frequency, (unsigned long*) &written );
 327 #else
 328                         m_deckLinkOutput->ScheduleAudioSamples( pcm, samples, streamTime, frequency, &written );
 329 #endif
 330
 331                         if ( written != (uint32_t) samples )
 332                                 mlt_log_verbose( getConsumer(), "renderAudio: samples=%d, written=%lu\n", samples, written );
 333                 }
 334         }
 335
 336         bool createFrame( IDeckLinkMutableVideoFrame** decklinkFrame )
 337         {
 338                 BMDPixelFormat format = m_isKeyer? bmdFormat8BitARGB : bmdFormat8BitYUV;
 339                 IDeckLinkMutableVideoFrame* frame = 0;
 340                 uint8_t *buffer = 0;
 341                 int stride = m_width * ( m_isKeyer? 4 : 2 );
 342
 343                 *decklinkFrame = NULL;
 344
 345                 // Generate a DeckLink video frame
 346                 if ( S_OK != m_deckLinkOutput->CreateVideoFrame( m_width, m_height,
 347                         stride, format, bmdFrameFlagDefault, &frame ) )
 348                 {
 349                         mlt_log_verbose( getConsumer(), "Failed to create video frame\n" );
 350                         stop();
 351                         return false;
 352                 }
 353
 354                 // Make the first line black for field order correction.
 355                 if ( S_OK == frame->GetBytes( (void**) &buffer ) && buffer )
 356                 {
 357                         if ( m_isKeyer )
 358                         {
 359                                 memset( buffer, 0, stride );
 360                         }
 361                         else for ( int i = 0; i < m_width; i++ )
 362                         {
 363                                 *buffer++ = 128;
 364                                 *buffer++ = 16;
 365                         }
 366                 }
 367
 368                 *decklinkFrame = frame;
 369
 370                 return true;
 371         }
 372
 373         void renderVideo( mlt_frame frame )
 374         {
 375                 mlt_image_format format = m_isKeyer? mlt_image_rgb24a : mlt_image_yuv422;
 376                 uint8_t* image = 0;
 377                 int rendered = mlt_properties_get_int( MLT_FRAME_PROPERTIES(frame), "rendered");
 378                 int height = m_height;
 379
 380                 if ( rendered && !mlt_frame_get_image( frame, &image, &format, &m_width, &height, 0 ) )
 381                 {
 382                         uint8_t* buffer = 0;
 383                         int stride = m_width * ( m_isKeyer? 4 : 2 );
 384
 385                         SAFE_RELEASE( m_decklinkFrame );
 386                         if ( createFrame( &m_decklinkFrame ) )
 387                                 m_decklinkFrame->GetBytes( (void**) &buffer );
 388
 389                         if ( buffer )
 390                         {
 391                                 int progressive = mlt_properties_get_int( MLT_FRAME_PROPERTIES( frame ), "progressive" );
 392
 393                                 // NTSC SDI is always 486 lines
 394                                 if ( m_height == 486 && height == 480 )
 395                                 {
 396                                         // blank first 6 lines
 397                                         if ( m_isKeyer )
 398                                         {
 399                                                 memset( buffer, 0, stride * 6 );
 400                                                 buffer += stride * 6;
 401                                         }
 402                                         else for ( int i = 0; i < m_width * 6; i++ )
 403                                         {
 404                                                 *buffer++ = 128;
 405                                                 *buffer++ = 16;
 406                                         }
 407                                 }
 408                                 if ( !m_isKeyer )
 409                                 {
 410                                         // Normal non-keyer playout - needs byte swapping
 411                                         if ( !progressive && m_displayMode->GetFieldDominance() == bmdUpperFieldFirst )
 412                                                 // convert lower field first to top field first
 413                                                 swab( (char*) image, (char*) buffer + stride, stride * ( height - 1 ) );
 414                                         else
 415                                                 swab( (char*) image, (char*) buffer, stride * height );
 416                                 }
 417                                 else if ( !mlt_properties_get_int( MLT_FRAME_PROPERTIES( frame ), "test_image" ) )
 418                                 {
 419                                         // Normal keyer output
 420                                         int y = height + 1;
 421                                         uint32_t* s = (uint32_t*) image;
 422                                         uint32_t* d = (uint32_t*) buffer;
 423
 424                                         if ( !progressive && m_displayMode->GetFieldDominance() == bmdUpperFieldFirst )
 425                                         {
 426                                                 // Correct field order
 427                                                 height--;
 428                                                 y--;
 429                                                 d += m_width;
 430                                         }
 431
 432                                         // Need to relocate alpha channel RGBA => ARGB
 433                                         while ( --y )
 434                                         {
 435                                                 int x = m_width + 1;
 436                                                 while ( --x )
 437                                                 {
 438                                                         *d++ = ( *s << 8 ) | ( *s >> 24 );
 439                                                         s++;
 440                                                 }
 441                                         }
 442                                 }
 443                                 else
 444                                 {
 445                                         // Keying blank frames - nullify alpha
 446                                         memset( buffer, 0, stride * height );
 447                                 }
 448                         }
 449                 }
 450                 if ( m_decklinkFrame )
 451                         m_deckLinkOutput->ScheduleVideoFrame( m_decklinkFrame, m_count * m_duration, m_duration, m_timescale );
 452
 453                 if ( !rendered )
 454                         mlt_log_verbose( getConsumer(), "dropped video frame %u\n", ++m_dropped );
 455         }
 456
 457         HRESULT render( mlt_frame frame )
 458         {
 459                 HRESULT result = S_OK;
 460
 461                 // Get the audio
 462                 double speed = mlt_properties_get_double( MLT_FRAME_PROPERTIES(frame), "_speed" );
 463                 if ( m_isAudio && speed == 1.0 )
 464                         renderAudio( frame );
 465
 466                 // Get the video
 467                 renderVideo( frame );
 468                 ++m_count;
 469
 470                 return result;
 471         }
 472
 473         // *** DeckLink API implementation of IDeckLinkVideoOutputCallback IDeckLinkAudioOutputCallback *** //
 474
 475         // IUnknown needs only a dummy implementation
 476         virtual HRESULT STDMETHODCALLTYPE QueryInterface( REFIID iid, LPVOID *ppv )
 477                 { return E_NOINTERFACE; }
 478         virtual ULONG STDMETHODCALLTYPE AddRef()
 479                 { return 1; }
 480         virtual ULONG STDMETHODCALLTYPE Release()
 481                 { return 1; }
 482
 483         /************************* DeckLink API Delegate Methods *****************************/
 484
 485         virtual HRESULT STDMETHODCALLTYPE ScheduledFrameCompleted( IDeckLinkVideoFrame* completedFrame, BMDOutputFrameCompletionResult completed )
 486         {
 487                 if( !m_reprio )
 488                 {
 489                         mlt_properties properties = MLT_CONSUMER_PROPERTIES( getConsumer() );
 490
 491                         if ( mlt_properties_get( properties, "priority" ) )
 492                         {
 493                                 int r;
 494                                 pthread_t thread;
 495                                 pthread_attr_t tattr;
 496                                 struct sched_param param;
 497
 498                                 pthread_attr_init(&tattr);
 499                                 pthread_attr_setschedpolicy(&tattr, SCHED_FIFO);
 500
 501                                 if ( !strcmp( "max", mlt_properties_get( properties, "priority" ) ) )
 502                                         param.sched_priority = sched_get_priority_max(SCHED_FIFO) - 1;
 503                                 else if ( !strcmp( "min", mlt_properties_get( properties, "priority" ) ) )
 504                                         param.sched_priority = sched_get_priority_min(SCHED_FIFO) + 1;
 505                                 else
 506                                         param.sched_priority = mlt_properties_get_int( properties, "priority" );
 507
 508                                 pthread_attr_setschedparam(&tattr, &param);
 509
 510                                 thread = pthread_self();
 511
 512                                 r = pthread_setschedparam(thread, SCHED_FIFO, &param);
 513                                 if( r )
 514                                         mlt_log_verbose( getConsumer(),
 515                                                 "ScheduledFrameCompleted: pthread_setschedparam returned %d\n", r);
 516                                 else
 517                                         mlt_log_verbose( getConsumer(),
 518                                                 "ScheduledFrameCompleted: param.sched_priority=%d\n", param.sched_priority);
 519                         };
 520
 521                         m_reprio = true;
 522                 };
 523
 524 #ifdef WIN32
 525                 unsigned long cnt;
 526 #else
 527                 uint32_t cnt;
 528 #endif
 529                 m_deckLinkOutput->GetBufferedAudioSampleFrameCount( &cnt );
 530                 if ( cnt != m_acnt )
 531                 {
 532                         mlt_log_debug( getConsumer(),
 533                                 "ScheduledFrameCompleted: GetBufferedAudioSampleFrameCount %u -> %lu, m_count=%"PRIu64"\n",
 534                                 m_acnt, cnt, m_count );
 535                         m_acnt = cnt;
 536                 }
 537
 538                 // When a video frame has been released by the API, schedule another video frame to be output
 539
 540                 // ignore handler if frame was flushed
 541                 if ( bmdOutputFrameFlushed == completed )
 542                         return S_OK;
 543
 544                 // schedule next frame
 545                 ScheduleNextFrame( false );
 546
 547                 // step forward frames counter if underrun
 548                 if ( bmdOutputFrameDisplayedLate == completed )
 549                 {
 550                         mlt_log_verbose( getConsumer(), "ScheduledFrameCompleted: bmdOutputFrameDisplayedLate == completed\n" );
 551                         m_count++;
 552                 }
 553                 if ( bmdOutputFrameDropped == completed )
 554                 {
 555                         mlt_log_verbose( getConsumer(), "ScheduledFrameCompleted: bmdOutputFrameDropped == completed\n" );
 556                         m_count++;
 557                 }
 558
 559                 return S_OK;
 560         }
 561
 562         virtual HRESULT STDMETHODCALLTYPE ScheduledPlaybackHasStopped()
 563         {
 564                 return mlt_consumer_is_stopped( getConsumer() ) ? S_FALSE : S_OK;
 565         }
 566
 567
 568         void ScheduleNextFrame( bool preroll )
 569         {
 570                 // get the consumer
 571                 mlt_consumer consumer = getConsumer();
 572
 573                 // Get the properties
 574                 mlt_properties properties = MLT_CONSUMER_PROPERTIES( consumer );
 575
 576                 // Frame and size
 577                 mlt_frame frame = NULL;
 578
 579                 if( mlt_properties_get_int( properties, "running" ) || preroll )
 580                 {
 581                         frame = mlt_consumer_rt_frame( consumer );
 582                         if ( frame != NULL )
 583                         {
 584                                 render( frame );
 585
 586                                 mlt_events_fire( properties, "consumer-frame-show", frame, NULL );
 587
 588                                 // terminate on pause
 589                                 if ( m_terminate_on_pause &&
 590                                         mlt_properties_get_double( MLT_FRAME_PROPERTIES( frame ), "_speed" ) == 0.0 )
 591                                         stop();
 592
 593                                 mlt_frame_close( frame );
 594                         }
 595                 }
 596         }
 597 };
 598
 599 /** Start the consumer.
 600  */
 601
 602 static int start( mlt_consumer consumer )
 603 {
 604         // Get the properties
 605         mlt_properties properties = MLT_CONSUMER_PROPERTIES( consumer );
 606         DeckLinkConsumer* decklink = (DeckLinkConsumer*) consumer->child;
 607         return decklink->start( mlt_properties_get_int( properties, "preroll" ) ) ? 0 : 1;
 608 }
 609
 610 /** Stop the consumer.
 611  */
 612
 613 static int stop( mlt_consumer consumer )
 614 {
 615         // Get the properties
 616         DeckLinkConsumer* decklink = (DeckLinkConsumer*) consumer->child;
 617         return decklink->stop();
 618 }
 619
 620 /** Determine if the consumer is stopped.
 621  */
 622
 623 static int is_stopped( mlt_consumer consumer )
 624 {
 625         // Get the properties
 626         mlt_properties properties = MLT_CONSUMER_PROPERTIES( consumer );
 627         return !mlt_properties_get_int( properties, "running" );
 628 }
 629
 630 /** Close the consumer.
 631  */
 632
 633 static void close( mlt_consumer consumer )
 634 {
 635         // Stop the consumer
 636         mlt_consumer_stop( consumer );
 637
 638         // Close the parent
 639         consumer->close = NULL;
 640         mlt_consumer_close( consumer );
 641
 642         // Free the memory
 643         delete (DeckLinkConsumer*) consumer->child;
 644 }
 645
 646 extern "C" {
 647
 648 // Listen for the list_devices property to be set
 649 static void on_property_changed( void*, mlt_properties properties, const char *name )
 650 {
 651         IDeckLinkIterator* decklinkIterator = NULL;
 652         IDeckLink* decklink = NULL;
 653         IDeckLinkInput* decklinkOutput = NULL;
 654         int i = 0;
 655
 656         if ( name && !strcmp( name, "list_devices" ) )
 657                 mlt_event_block( (mlt_event) mlt_properties_get_data( properties, "list-devices-event", NULL ) );
 658         else
 659                 return;
 660
 661 #ifdef WIN32
 662         if ( FAILED( CoInitialize( NULL ) ) )
 663                 return;
 664         if ( FAILED( CoCreateInstance( CLSID_CDeckLinkIterator, NULL, CLSCTX_ALL, IID_IDeckLinkIterator, (void**) &decklinkIterator ) ) )
 665                 return;
 666 #else
 667         if ( !( decklinkIterator = CreateDeckLinkIteratorInstance() ) )
 668                 return;
 669 #endif
 670         for ( ; decklinkIterator->Next( &decklink ) == S_OK; i++ )
 671         {
 672                 if ( decklink->QueryInterface( IID_IDeckLinkOutput, (void**) &decklinkOutput ) == S_OK )
 673                 {
 674                         DLString name = NULL;
 675                         if ( decklink->GetModelName( &name ) == S_OK )
 676                         {
 677                                 char *name_cstr = getCString( name );
 678                                 const char *format = "device.%d";
 679                                 char *key = (char*) calloc( 1, strlen( format ) + 1 );
 680
 681                                 sprintf( key, format, i );
 682                                 mlt_properties_set( properties, key, name_cstr );
 683                                 free( key );
 684                                 freeDLString( name );
 685                                 freeCString( name_cstr );
 686                         }
 687                         SAFE_RELEASE( decklinkOutput );
 688                 }
 689                 SAFE_RELEASE( decklink );
 690         }
 691         SAFE_RELEASE( decklinkIterator );
 692         mlt_properties_set_int( properties, "devices", i );
 693 }
 694
 695 /** Initialise the consumer.
 696  */
 697
 698 mlt_consumer consumer_decklink_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg )
 699 {
 700         // Allocate the consumer
 701         DeckLinkConsumer* decklink = new DeckLinkConsumer();
 702         mlt_consumer consumer = NULL;
 703
 704         // If allocated
 705         if ( decklink && !mlt_consumer_init( decklink->getConsumer(), decklink, profile ) )
 706         {
 707                 // If initialises without error
 708                 if ( decklink->open( arg? atoi(arg) : 0 ) )
 709                 {
 710                         consumer = decklink->getConsumer();
 711                         mlt_properties properties = MLT_CONSUMER_PROPERTIES( consumer );
 712
 713                         // Setup callbacks
 714                         consumer->close = close;
 715                         consumer->start = start;
 716                         consumer->stop = stop;
 717                         consumer->is_stopped = is_stopped;
 718                         mlt_properties_set( properties, "deinterlace_method", "onefield" );
 719
 720                         mlt_event event = mlt_events_listen( properties, properties, "property-changed", (mlt_listener) on_property_changed );
 721                         mlt_properties_set_data( properties, "list-devices-event", event, 0, NULL, NULL );
 722                 }
 723         }
 724
 725         // Return consumer
 726         return consumer;
 727 }
 728
 729 extern mlt_producer producer_decklink_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg );
 730
 731 static mlt_properties metadata( mlt_service_type type, const char *id, void *data )
 732 {
 733         char file[ PATH_MAX ];
 734         const char *service_type = NULL;
 735         switch ( type )
 736         {
 737                 case consumer_type:
 738                         service_type = "consumer";
 739                         break;
 740                 case producer_type:
 741                         service_type = "producer";
 742                         break;
 743                 default:
 744                         return NULL;
 745         }
 746         snprintf( file, PATH_MAX, "%s/decklink/%s_%s.yml", mlt_environment( "MLT_DATA" ), service_type, id );
 747         return mlt_properties_parse_yaml( file );
 748 }
 749
 750 MLT_REPOSITORY
 751 {
 752         MLT_REGISTER( consumer_type, "decklink", consumer_decklink_init );
 753         MLT_REGISTER( producer_type, "decklink", producer_decklink_init );
 754         MLT_REGISTER_METADATA( consumer_type, "decklink", metadata, NULL );
 755         MLT_REGISTER_METADATA( producer_type, "decklink", metadata, NULL );
 756 }
 757
 758 } // extern C