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 typedef const char* BSTR;
  35 #endif
  36
  37 #define SAFE_RELEASE(V) if (V) { V->Release(); V = NULL; }
  38
  39 static const unsigned PREROLL_MINIMUM = 3;
  40
  41 class DeckLinkConsumer
  42         : public IDeckLinkVideoOutputCallback
  43 {
  44 private:
  45         mlt_consumer_s              m_consumer;
  46         IDeckLink*                  m_deckLink;
  47         IDeckLinkOutput*            m_deckLinkOutput;
  48         IDeckLinkDisplayMode*       m_displayMode;
  49         int                         m_width;
  50         int                         m_height;
  51         BMDTimeValue                m_duration;
  52         BMDTimeScale                m_timescale;
  53         double                      m_fps;
  54         uint64_t                    m_count;
  55         int                         m_channels;
  56         unsigned                    m_dropped;
  57         IDeckLinkMutableVideoFrame* m_decklinkFrame;
  58         bool                        m_isAudio;
  59         int                         m_isKeyer;
  60         IDeckLinkKeyer*             m_deckLinkKeyer;
  61         bool                        m_terminate_on_pause;
  62         uint32_t                    m_preroll;
  63         uint32_t                    m_acnt;
  64         bool                        m_reprio;
  65         pthread_t                   m_prerollThread;
  66
  67         IDeckLinkDisplayMode* getDisplayMode()
  68         {
  69                 mlt_profile profile = mlt_service_profile( MLT_CONSUMER_SERVICE( getConsumer() ) );
  70                 IDeckLinkDisplayModeIterator* iter = NULL;
  71                 IDeckLinkDisplayMode* mode = NULL;
  72                 IDeckLinkDisplayMode* result = 0;
  73
  74                 if ( m_deckLinkOutput->GetDisplayModeIterator( &iter ) == S_OK )
  75                 {
  76                         while ( !result && iter->Next( &mode ) == S_OK )
  77                         {
  78                                 m_width = mode->GetWidth();
  79                                 m_height = mode->GetHeight();
  80                                 mode->GetFrameRate( &m_duration, &m_timescale );
  81                                 m_fps = (double) m_timescale / m_duration;
  82                                 int p = mode->GetFieldDominance() == bmdProgressiveFrame;
  83                                 mlt_log_verbose( getConsumer(), "BMD mode %dx%d %.3f fps prog %d\n", m_width, m_height, m_fps, p );
  84
  85                                 if ( m_width == profile->width && p == profile->progressive
  86                                          && m_fps == mlt_profile_fps( profile )
  87                                          && ( m_height == profile->height || ( m_height == 486 && profile->height == 480 ) ) )
  88                                         result = mode;
  89                                 else
  90                                         SAFE_RELEASE( mode );
  91                         }
  92                         SAFE_RELEASE( iter );
  93                 }
  94
  95                 return result;
  96         }
  97
  98 public:
  99         mlt_consumer getConsumer()
 100                 { return &m_consumer; }
 101
 102         DeckLinkConsumer()
 103         {
 104                 m_displayMode = NULL;
 105                 m_deckLinkKeyer = NULL;
 106                 m_deckLinkOutput = NULL;
 107                 m_deckLink = NULL;
 108         }
 109
 110         ~DeckLinkConsumer()
 111         {
 112                 SAFE_RELEASE( m_displayMode );
 113                 SAFE_RELEASE( m_deckLinkKeyer );
 114                 SAFE_RELEASE( m_deckLinkOutput );
 115                 SAFE_RELEASE( m_deckLink );
 116         }
 117
 118         bool open( unsigned card = 0 )
 119         {
 120                 unsigned i = 0;
 121 #ifdef WIN32
 122                 IDeckLinkIterator* deckLinkIterator = NULL;
 123                 HRESULT result =  CoInitialize( NULL );
 124                 if ( FAILED( result ) )
 125                 {
 126                         mlt_log_error( getConsumer(), "COM initialization failed\n" );
 127                         return false;
 128                 }
 129                 result = CoCreateInstance( CLSID_CDeckLinkIterator, NULL, CLSCTX_ALL, IID_IDeckLinkIterator, (void**) &deckLinkIterator );
 130                 if ( FAILED( result ) )
 131                 {
 132                         mlt_log_error( getConsumer(), "The DeckLink drivers not installed.\n" );
 133                         return false;
 134                 }
 135 #else
 136                 IDeckLinkIterator* deckLinkIterator = CreateDeckLinkIteratorInstance();
 137
 138                 if ( !deckLinkIterator )
 139                 {
 140                         mlt_log_error( getConsumer(), "The DeckLink drivers not installed.\n" );
 141                         return false;
 142                 }
 143 #endif
 144
 145                 // Connect to the Nth DeckLink instance
 146                 for ( i = 0; deckLinkIterator->Next( &m_deckLink ) == S_OK ; i++)
 147                 {
 148                         if( i == card )
 149                                 break;
 150                         else
 151                                 SAFE_RELEASE( m_deckLink );
 152                 }
 153                 SAFE_RELEASE( deckLinkIterator );
 154                 if ( !m_deckLink )
 155                 {
 156                         mlt_log_error( getConsumer(), "DeckLink card not found\n" );
 157                         return false;
 158                 }
 159
 160                 // Obtain the audio/video output interface (IDeckLinkOutput)
 161                 if ( m_deckLink->QueryInterface( IID_IDeckLinkOutput, (void**)&m_deckLinkOutput ) != S_OK )
 162                 {
 163                         mlt_log_error( getConsumer(), "No DeckLink cards support output\n" );
 164                         SAFE_RELEASE( m_deckLink );
 165                         return false;
 166                 }
 167
 168                 // Get the keyer interface
 169                 IDeckLinkAttributes *deckLinkAttributes = 0;
 170                 if ( m_deckLink->QueryInterface( IID_IDeckLinkAttributes, (void**) &deckLinkAttributes ) == S_OK )
 171                 {
 172 #ifdef WIN32
 173                         BOOL flag = FALSE;
 174 #else
 175                         bool flag = false;
 176 #endif
 177                         if ( deckLinkAttributes->GetFlag( BMDDeckLinkSupportsInternalKeying, &flag ) == S_OK && flag )
 178                         {
 179                                 if ( m_deckLink->QueryInterface( IID_IDeckLinkKeyer, (void**) &m_deckLinkKeyer ) != S_OK )
 180                                 {
 181                                         mlt_log_error( getConsumer(), "Failed to get keyer\n" );
 182                                         SAFE_RELEASE( m_deckLinkOutput );
 183                                         SAFE_RELEASE( m_deckLink );
 184                                         return false;
 185                                 }
 186                         }
 187                         SAFE_RELEASE( deckLinkAttributes );
 188                 }
 189
 190                 // Provide this class as a delegate to the audio and video output interfaces
 191                 m_deckLinkOutput->SetScheduledFrameCompletionCallback( this );
 192
 193                 return true;
 194         }
 195
 196
 197         void* preroll_thread()
 198         {
 199                 // preroll frames
 200                 for ( unsigned i = 0; i < m_preroll; i++ )
 201                         ScheduleNextFrame( true );
 202
 203                 // start scheduled playback
 204                 m_deckLinkOutput->StartScheduledPlayback( 0, m_timescale, 1.0 );
 205
 206                 return 0;
 207         }
 208
 209         static void* preroll_thread_proxy( void* arg )
 210         {
 211                 DeckLinkConsumer* self = static_cast< DeckLinkConsumer* >( arg );
 212                 return self->preroll_thread();
 213         }
 214
 215         bool start( unsigned preroll )
 216         {
 217                 mlt_properties properties = MLT_CONSUMER_PROPERTIES( getConsumer() );
 218
 219                 // Initialize members
 220                 m_count = 0;
 221                 m_dropped = 0;
 222                 m_decklinkFrame = NULL;
 223                 preroll = preroll < PREROLL_MINIMUM ? PREROLL_MINIMUM : preroll;
 224                 m_channels = mlt_properties_get_int( properties, "channels" );
 225                 m_isAudio = !mlt_properties_get_int( properties, "audio_off" );
 226                 m_terminate_on_pause = mlt_properties_get_int( properties, "terminate_on_pause" );
 227
 228
 229                 m_displayMode = getDisplayMode();
 230                 if ( !m_displayMode )
 231                 {
 232                         mlt_log_error( getConsumer(), "Profile is not compatible with decklink.\n" );
 233                         return false;
 234                 }
 235
 236                 // Set the keyer
 237                 if ( m_deckLinkKeyer && ( m_isKeyer = mlt_properties_get_int( properties, "keyer" ) ) )
 238                 {
 239                         bool external = ( m_isKeyer == 2 );
 240                         double level = mlt_properties_get_double( properties, "keyer_level" );
 241
 242                         if ( m_deckLinkKeyer->Enable( external ) != S_OK )
 243                                 mlt_log_error( getConsumer(), "Failed to enable %s keyer\n",
 244                                         external ? "external" : "internal" );
 245                         m_deckLinkKeyer->SetLevel( level <= 1 ? ( level > 0 ? 255 * level : 255 ) : 255 );
 246                 }
 247                 else if ( m_deckLinkKeyer )
 248                 {
 249                         m_deckLinkKeyer->Disable();
 250                 }
 251
 252                 // Set the video output mode
 253                 if ( S_OK != m_deckLinkOutput->EnableVideoOutput( m_displayMode->GetDisplayMode(), bmdVideoOutputFlagDefault ) )
 254                 {
 255                         mlt_log_error( getConsumer(), "Failed to enable video output\n" );
 256                         return false;
 257                 }
 258
 259                 // Set the audio output mode
 260                 if ( !m_isAudio )
 261                 {
 262                         m_deckLinkOutput->DisableAudioOutput();
 263                         return true;
 264                 }
 265                 if ( S_OK != m_deckLinkOutput->EnableAudioOutput( bmdAudioSampleRate48kHz, bmdAudioSampleType16bitInteger,
 266                         m_channels, bmdAudioOutputStreamTimestamped ) )
 267                 {
 268                         mlt_log_error( getConsumer(), "Failed to enable audio output\n" );
 269                         stop();
 270                         return false;
 271                 }
 272
 273                 m_preroll = preroll;
 274                 m_reprio = false;
 275
 276                 // Do preroll in thread to ensure asynchronicity of mlt_consumer_start().
 277                 pthread_create( &m_prerollThread, NULL, preroll_thread_proxy, this );
 278
 279                 // Set the running state
 280                 mlt_properties_set_int( properties, "running", 1 );
 281
 282                 return true;
 283         }
 284
 285         bool stop()
 286         {
 287                 mlt_properties properties = MLT_CONSUMER_PROPERTIES( getConsumer() );
 288                 bool wasRunning = !!mlt_properties_get_int( properties, "running" );
 289
 290                 // set running state is 0
 291                 mlt_properties_set_int( properties, "running", 0 );
 292                 mlt_consumer_stopped( getConsumer() );
 293
 294                 // Stop the audio and video output streams immediately
 295                 if ( m_deckLinkOutput )
 296                 {
 297                         m_deckLinkOutput->StopScheduledPlayback( 0, 0, 0 );
 298                         m_deckLinkOutput->DisableAudioOutput();
 299                         m_deckLinkOutput->DisableVideoOutput();
 300                 }
 301
 302                 // release decklink frame
 303                 SAFE_RELEASE( m_decklinkFrame );
 304
 305                 if ( wasRunning )
 306                         pthread_join( m_prerollThread, NULL );
 307
 308                 return true;
 309         }
 310
 311         void renderAudio( mlt_frame frame )
 312         {
 313                 mlt_audio_format format = mlt_audio_s16;
 314                 int frequency = bmdAudioSampleRate48kHz;
 315                 int samples = mlt_sample_calculator( m_fps, frequency, m_count );
 316                 int16_t *pcm = 0;
 317
 318                 if ( !mlt_frame_get_audio( frame, (void**) &pcm, &format, &frequency, &m_channels, &samples ) )
 319                 {
 320 #ifdef WIN32
 321                         unsigned long written = 0;
 322 #else
 323                         uint32_t written = 0;
 324 #endif
 325                         BMDTimeValue streamTime = m_count * frequency * m_duration / m_timescale;
 326                         m_deckLinkOutput->GetBufferedAudioSampleFrameCount( &written );
 327                         if ( written > (m_preroll + 1) * samples )
 328                         {
 329                                 mlt_log_verbose( getConsumer(), "renderAudio: will flush %lu audiosamples\n", written );
 330                                 m_deckLinkOutput->FlushBufferedAudioSamples();
 331                         };
 332 #ifdef WIN32
 333                         m_deckLinkOutput->ScheduleAudioSamples( pcm, samples, streamTime, frequency, (unsigned long*) &written );
 334 #else
 335                         m_deckLinkOutput->ScheduleAudioSamples( pcm, samples, streamTime, frequency, &written );
 336 #endif
 337
 338                         if ( written != (uint32_t) samples )
 339                                 mlt_log_verbose( getConsumer(), "renderAudio: samples=%d, written=%lu\n", samples, written );
 340                 }
 341         }
 342
 343         bool createFrame( IDeckLinkMutableVideoFrame** decklinkFrame )
 344         {
 345                 BMDPixelFormat format = m_isKeyer? bmdFormat8BitARGB : bmdFormat8BitYUV;
 346                 IDeckLinkMutableVideoFrame* frame = 0;
 347                 uint8_t *buffer = 0;
 348                 int stride = m_width * ( m_isKeyer? 4 : 2 );
 349
 350                 *decklinkFrame = NULL;
 351
 352                 // Generate a DeckLink video frame
 353                 if ( S_OK != m_deckLinkOutput->CreateVideoFrame( m_width, m_height,
 354                         stride, format, bmdFrameFlagDefault, &frame ) )
 355                 {
 356                         mlt_log_verbose( getConsumer(), "Failed to create video frame\n" );
 357                         stop();
 358                         return false;
 359                 }
 360
 361                 // Make the first line black for field order correction.
 362                 if ( S_OK == frame->GetBytes( (void**) &buffer ) && buffer )
 363                 {
 364                         if ( m_isKeyer )
 365                         {
 366                                 memset( buffer, 0, stride );
 367                         }
 368                         else for ( int i = 0; i < m_width; i++ )
 369                         {
 370                                 *buffer++ = 128;
 371                                 *buffer++ = 16;
 372                         }
 373                 }
 374
 375                 *decklinkFrame = frame;
 376
 377                 return true;
 378         }
 379
 380         void renderVideo( mlt_frame frame )
 381         {
 382                 mlt_image_format format = m_isKeyer? mlt_image_rgb24a : mlt_image_yuv422;
 383                 uint8_t* image = 0;
 384                 int rendered = mlt_properties_get_int( MLT_FRAME_PROPERTIES(frame), "rendered");
 385                 int height = m_height;
 386
 387                 if ( rendered && !mlt_frame_get_image( frame, &image, &format, &m_width, &height, 0 ) )
 388                 {
 389                         uint8_t* buffer = 0;
 390                         int stride = m_width * ( m_isKeyer? 4 : 2 );
 391
 392                         SAFE_RELEASE( m_decklinkFrame );
 393                         if ( createFrame( &m_decklinkFrame ) )
 394                                 m_decklinkFrame->GetBytes( (void**) &buffer );
 395
 396                         if ( buffer )
 397                         {
 398                                 int progressive = mlt_properties_get_int( MLT_FRAME_PROPERTIES( frame ), "progressive" );
 399
 400                                 // NTSC SDI is always 486 lines
 401                                 if ( m_height == 486 && height == 480 )
 402                                 {
 403                                         // blank first 6 lines
 404                                         if ( m_isKeyer )
 405                                         {
 406                                                 memset( buffer, 0, stride * 6 );
 407                                                 buffer += stride * 6;
 408                                         }
 409                                         else for ( int i = 0; i < m_width * 6; i++ )
 410                                         {
 411                                                 *buffer++ = 128;
 412                                                 *buffer++ = 16;
 413                                         }
 414                                 }
 415                                 if ( !m_isKeyer )
 416                                 {
 417                                         // Normal non-keyer playout - needs byte swapping
 418                                         if ( !progressive && m_displayMode->GetFieldDominance() == bmdUpperFieldFirst )
 419                                                 // convert lower field first to top field first
 420                                                 swab( (char*) image, (char*) buffer + stride, stride * ( height - 1 ) );
 421                                         else
 422                                                 swab( (char*) image, (char*) buffer, stride * height );
 423                                 }
 424                                 else if ( !mlt_properties_get_int( MLT_FRAME_PROPERTIES( frame ), "test_image" ) )
 425                                 {
 426                                         // Normal keyer output
 427                                         int y = height + 1;
 428                                         uint32_t* s = (uint32_t*) image;
 429                                         uint32_t* d = (uint32_t*) buffer;
 430
 431                                         if ( !progressive && m_displayMode->GetFieldDominance() == bmdUpperFieldFirst )
 432                                         {
 433                                                 // Correct field order
 434                                                 height--;
 435                                                 y--;
 436                                                 d += m_width;
 437                                         }
 438
 439                                         // Need to relocate alpha channel RGBA => ARGB
 440                                         while ( --y )
 441                                         {
 442                                                 int x = m_width + 1;
 443                                                 while ( --x )
 444                                                 {
 445                                                         *d++ = ( *s << 8 ) | ( *s >> 24 );
 446                                                         s++;
 447                                                 }
 448                                         }
 449                                 }
 450                                 else
 451                                 {
 452                                         // Keying blank frames - nullify alpha
 453                                         memset( buffer, 0, stride * height );
 454                                 }
 455                         }
 456                 }
 457                 if ( m_decklinkFrame )
 458                         m_deckLinkOutput->ScheduleVideoFrame( m_decklinkFrame, m_count * m_duration, m_duration, m_timescale );
 459
 460                 if ( !rendered )
 461                         mlt_log_verbose( getConsumer(), "dropped video frame %u\n", ++m_dropped );
 462         }
 463
 464         HRESULT render( mlt_frame frame )
 465         {
 466                 HRESULT result = S_OK;
 467
 468                 // Get the audio
 469                 double speed = mlt_properties_get_double( MLT_FRAME_PROPERTIES(frame), "_speed" );
 470                 if ( m_isAudio && speed == 1.0 )
 471                         renderAudio( frame );
 472
 473                 // Get the video
 474                 renderVideo( frame );
 475                 ++m_count;
 476
 477                 return result;
 478         }
 479
 480         // *** DeckLink API implementation of IDeckLinkVideoOutputCallback IDeckLinkAudioOutputCallback *** //
 481
 482         // IUnknown needs only a dummy implementation
 483         virtual HRESULT STDMETHODCALLTYPE QueryInterface( REFIID iid, LPVOID *ppv )
 484                 { return E_NOINTERFACE; }
 485         virtual ULONG STDMETHODCALLTYPE AddRef()
 486                 { return 1; }
 487         virtual ULONG STDMETHODCALLTYPE Release()
 488                 { return 1; }
 489
 490         /************************* DeckLink API Delegate Methods *****************************/
 491
 492         virtual HRESULT STDMETHODCALLTYPE ScheduledFrameCompleted( IDeckLinkVideoFrame* completedFrame, BMDOutputFrameCompletionResult completed )
 493         {
 494                 if( !m_reprio )
 495                 {
 496                         mlt_properties properties = MLT_CONSUMER_PROPERTIES( getConsumer() );
 497
 498                         if ( mlt_properties_get( properties, "priority" ) )
 499                         {
 500                                 int r;
 501                                 pthread_t thread;
 502                                 pthread_attr_t tattr;
 503                                 struct sched_param param;
 504
 505                                 pthread_attr_init(&tattr);
 506                                 pthread_attr_setschedpolicy(&tattr, SCHED_FIFO);
 507
 508                                 if ( !strcmp( "max", mlt_properties_get( properties, "priority" ) ) )
 509                                         param.sched_priority = sched_get_priority_max(SCHED_FIFO) - 1;
 510                                 else if ( !strcmp( "min", mlt_properties_get( properties, "priority" ) ) )
 511                                         param.sched_priority = sched_get_priority_min(SCHED_FIFO) + 1;
 512                                 else
 513                                         param.sched_priority = mlt_properties_get_int( properties, "priority" );
 514
 515                                 pthread_attr_setschedparam(&tattr, &param);
 516
 517                                 thread = pthread_self();
 518
 519                                 r = pthread_setschedparam(thread, SCHED_FIFO, &param);
 520                                 if( r )
 521                                         mlt_log_verbose( getConsumer(),
 522                                                 "ScheduledFrameCompleted: pthread_setschedparam returned %d\n", r);
 523                                 else
 524                                         mlt_log_verbose( getConsumer(),
 525                                                 "ScheduledFrameCompleted: param.sched_priority=%d\n", param.sched_priority);
 526                         };
 527
 528                         m_reprio = true;
 529                 };
 530
 531 #ifdef WIN32
 532                 unsigned long cnt;
 533 #else
 534                 uint32_t cnt;
 535 #endif
 536                 m_deckLinkOutput->GetBufferedAudioSampleFrameCount( &cnt );
 537                 if ( cnt != m_acnt )
 538                 {
 539                         mlt_log_debug( getConsumer(),
 540                                 "ScheduledFrameCompleted: GetBufferedAudioSampleFrameCount %u -> %lu, m_count=%"PRIu64"\n",
 541                                 m_acnt, cnt, m_count );
 542                         m_acnt = cnt;
 543                 }
 544
 545                 // When a video frame has been released by the API, schedule another video frame to be output
 546
 547                 // ignore handler if frame was flushed
 548                 if ( bmdOutputFrameFlushed == completed )
 549                         return S_OK;
 550
 551                 // schedule next frame
 552                 ScheduleNextFrame( false );
 553
 554                 // step forward frames counter if underrun
 555                 if ( bmdOutputFrameDisplayedLate == completed )
 556                 {
 557                         mlt_log_verbose( getConsumer(), "ScheduledFrameCompleted: bmdOutputFrameDisplayedLate == completed\n" );
 558                         m_count++;
 559                 }
 560                 if ( bmdOutputFrameDropped == completed )
 561                 {
 562                         mlt_log_verbose( getConsumer(), "ScheduledFrameCompleted: bmdOutputFrameDropped == completed\n" );
 563                         m_count++;
 564                 }
 565
 566                 return S_OK;
 567         }
 568
 569         virtual HRESULT STDMETHODCALLTYPE ScheduledPlaybackHasStopped()
 570         {
 571                 return mlt_consumer_is_stopped( getConsumer() ) ? S_FALSE : S_OK;
 572         }
 573
 574
 575         void ScheduleNextFrame( bool preroll )
 576         {
 577                 // get the consumer
 578                 mlt_consumer consumer = getConsumer();
 579
 580                 // Get the properties
 581                 mlt_properties properties = MLT_CONSUMER_PROPERTIES( consumer );
 582
 583                 // Frame and size
 584                 mlt_frame frame = NULL;
 585
 586                 if( mlt_properties_get_int( properties, "running" ) || preroll )
 587                 {
 588                         frame = mlt_consumer_rt_frame( consumer );
 589                         if ( frame != NULL )
 590                         {
 591                                 render( frame );
 592
 593                                 mlt_events_fire( properties, "consumer-frame-show", frame, NULL );
 594
 595                                 // terminate on pause
 596                                 if ( m_terminate_on_pause &&
 597                                         mlt_properties_get_double( MLT_FRAME_PROPERTIES( frame ), "_speed" ) == 0.0 )
 598                                         stop();
 599
 600                                 mlt_frame_close( frame );
 601                         }
 602                 }
 603         }
 604 };
 605
 606 /** Start the consumer.
 607  */
 608
 609 static int start( mlt_consumer consumer )
 610 {
 611         // Get the properties
 612         mlt_properties properties = MLT_CONSUMER_PROPERTIES( consumer );
 613         DeckLinkConsumer* decklink = (DeckLinkConsumer*) consumer->child;
 614         return decklink->start( mlt_properties_get_int( properties, "preroll" ) ) ? 0 : 1;
 615 }
 616
 617 /** Stop the consumer.
 618  */
 619
 620 static int stop( mlt_consumer consumer )
 621 {
 622         // Get the properties
 623         DeckLinkConsumer* decklink = (DeckLinkConsumer*) consumer->child;
 624         return decklink->stop();
 625 }
 626
 627 /** Determine if the consumer is stopped.
 628  */
 629
 630 static int is_stopped( mlt_consumer consumer )
 631 {
 632         // Get the properties
 633         mlt_properties properties = MLT_CONSUMER_PROPERTIES( consumer );
 634         return !mlt_properties_get_int( properties, "running" );
 635 }
 636
 637 /** Close the consumer.
 638  */
 639
 640 static void close( mlt_consumer consumer )
 641 {
 642         // Stop the consumer
 643         mlt_consumer_stop( consumer );
 644
 645         // Close the parent
 646         consumer->close = NULL;
 647         mlt_consumer_close( consumer );
 648
 649         // Free the memory
 650         delete (DeckLinkConsumer*) consumer->child;
 651 }
 652
 653 extern "C" {
 654
 655 // Listen for the list_devices property to be set
 656 static void on_property_changed( void*, mlt_properties properties, const char *name )
 657 {
 658         IDeckLinkIterator* decklinkIterator = NULL;
 659         IDeckLink* decklink = NULL;
 660         IDeckLinkInput* decklinkOutput = NULL;
 661         int i = 0;
 662
 663         if ( name && !strcmp( name, "list_devices" ) )
 664                 mlt_event_block( (mlt_event) mlt_properties_get_data( properties, "list-devices-event", NULL ) );
 665         else
 666                 return;
 667
 668 #ifdef WIN32
 669         if ( FAILED( CoInitialize( NULL ) ) )
 670                 return;
 671         if ( FAILED( CoCreateInstance( CLSID_CDeckLinkIterator, NULL, CLSCTX_ALL, IID_IDeckLinkIterator, (void**) &decklinkIterator ) ) )
 672                 return;
 673 #else
 674         if ( !( decklinkIterator = CreateDeckLinkIteratorInstance() ) )
 675                 return;
 676 #endif
 677         for ( ; decklinkIterator->Next( &decklink ) == S_OK; i++ )
 678         {
 679                 if ( decklink->QueryInterface( IID_IDeckLinkOutput, (void**) &decklinkOutput ) == S_OK )
 680                 {
 681                         char *name = NULL;
 682                         if ( decklink->GetModelName( (BSTR*) &name ) == S_OK )
 683                         {
 684                                 const char *format = "device.%d";
 685                                 char *key = (char*) calloc( 1, strlen( format ) + 1 );
 686
 687                                 sprintf( key, format, i );
 688                                 mlt_properties_set( properties, key, name );
 689                                 free( key );
 690                                 free( name );
 691                         }
 692                         SAFE_RELEASE( decklinkOutput );
 693                 }
 694                 SAFE_RELEASE( decklink );
 695         }
 696         SAFE_RELEASE( decklinkIterator );
 697         mlt_properties_set_int( properties, "devices", i );
 698 }
 699
 700 /** Initialise the consumer.
 701  */
 702
 703 mlt_consumer consumer_decklink_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg )
 704 {
 705         // Allocate the consumer
 706         DeckLinkConsumer* decklink = new DeckLinkConsumer();
 707         mlt_consumer consumer = NULL;
 708
 709         // If allocated
 710         if ( decklink && !mlt_consumer_init( decklink->getConsumer(), decklink, profile ) )
 711         {
 712                 // If initialises without error
 713                 if ( decklink->open( arg? atoi(arg) : 0 ) )
 714                 {
 715                         consumer = decklink->getConsumer();
 716                         mlt_properties properties = MLT_CONSUMER_PROPERTIES( consumer );
 717
 718                         // Setup callbacks
 719                         consumer->close = close;
 720                         consumer->start = start;
 721                         consumer->stop = stop;
 722                         consumer->is_stopped = is_stopped;
 723                         mlt_properties_set( properties, "deinterlace_method", "onefield" );
 724
 725                         mlt_event event = mlt_events_listen( properties, properties, "property-changed", (mlt_listener) on_property_changed );
 726                         mlt_properties_set_data( properties, "list-devices-event", event, 0, NULL, NULL );
 727                 }
 728         }
 729
 730         // Return consumer
 731         return consumer;
 732 }
 733
 734 extern mlt_producer producer_decklink_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg );
 735
 736 static mlt_properties metadata( mlt_service_type type, const char *id, void *data )
 737 {
 738         char file[ PATH_MAX ];
 739         const char *service_type = NULL;
 740         switch ( type )
 741         {
 742                 case consumer_type:
 743                         service_type = "consumer";
 744                         break;
 745                 case producer_type:
 746                         service_type = "producer";
 747                         break;
 748                 default:
 749                         return NULL;
 750         }
 751         snprintf( file, PATH_MAX, "%s/decklink/%s_%s.yml", mlt_environment( "MLT_DATA" ), service_type, id );
 752         return mlt_properties_parse_yaml( file );
 753 }
 754
 755 MLT_REPOSITORY
 756 {
 757         MLT_REGISTER( consumer_type, "decklink", consumer_decklink_init );
 758         MLT_REGISTER( producer_type, "decklink", producer_decklink_init );
 759         MLT_REGISTER_METADATA( consumer_type, "decklink", metadata, NULL );
 760         MLT_REGISTER_METADATA( producer_type, "decklink", metadata, NULL );
 761 }
 762
 763 } // extern C