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 #include <framework/mlt.h>
  21 #include <stdlib.h>
  22 #include <string.h>
  23 #include <pthread.h>
  24 #include <unistd.h>
  25 #include <sys/time.h>
  26 #include <limits.h>
  27 #include "DeckLinkAPI.h"
  28
  29 static const unsigned PREROLL_MINIMUM = 3;
  30
  31 typedef struct
  32 {
  33         int16_t *buffer;
  34         int size;
  35         int used;
  36         pthread_mutex_t mutex;
  37 } *sample_fifo;
  38
  39 static sample_fifo sample_fifo_init()
  40 {
  41         sample_fifo fifo = (sample_fifo) calloc( 1, sizeof( *fifo ) );
  42         pthread_mutex_init( &fifo->mutex, NULL );
  43         return fifo;
  44 }
  45
  46 static void sample_fifo_append( sample_fifo fifo, int16_t *samples, int count )
  47 {
  48         pthread_mutex_lock( &fifo->mutex );
  49         if ( ( fifo->size - fifo->used ) < count )
  50         {
  51                 fifo->size += count * 5;
  52                 fifo->buffer = (int16_t*) realloc( fifo->buffer, fifo->size * sizeof( int16_t ) );
  53         }
  54         memcpy( fifo->buffer + fifo->used, samples, count * sizeof( int16_t ) );
  55         fifo->used += count;
  56         pthread_mutex_unlock( &fifo->mutex );
  57 }
  58
  59 static void sample_fifo_remove( sample_fifo fifo, int count )
  60 {
  61         pthread_mutex_lock( &fifo->mutex );
  62         if ( count > fifo->used )
  63                 count = fifo->used;
  64         fifo->used -= count;
  65         memmove( fifo->buffer, fifo->buffer + count, fifo->used * sizeof( int16_t ) );
  66         pthread_mutex_unlock( &fifo->mutex );
  67 }
  68
  69 static void sample_fifo_close( sample_fifo fifo )
  70 {
  71         free( fifo->buffer );
  72         pthread_mutex_destroy( &fifo->mutex );
  73         free( fifo );
  74 }
  75
  76
  77 class DeckLinkConsumer
  78         : public IDeckLinkVideoOutputCallback
  79         , public IDeckLinkAudioOutputCallback
  80 {
  81 private:
  82         mlt_consumer_s              m_consumer;
  83         IDeckLink*                  m_deckLink;
  84         IDeckLinkOutput*            m_deckLinkOutput;
  85         IDeckLinkDisplayMode*       m_displayMode;
  86         pthread_mutex_t             m_mutex;
  87         pthread_cond_t              m_condition;
  88         int                         m_width;
  89         int                         m_height;
  90         BMDTimeValue                m_duration;
  91         BMDTimeScale                m_timescale;
  92         double                      m_fps;
  93         uint64_t                    m_count;
  94         sample_fifo                 m_fifo;
  95         unsigned                    m_preroll;
  96         bool                        m_isPrerolling;
  97         unsigned                    m_prerollCounter;
  98         int                         m_channels;
  99         uint32_t                    m_maxAudioBuffer;
 100         mlt_deque                   m_videoFrameQ;
 101         mlt_frame                   m_frame;
 102         unsigned                    m_dropped;
 103         bool                        m_isAudio;
 104         bool                        m_isKeyer;
 105         IDeckLinkKeyer*             m_deckLinkKeyer;
 106
 107         IDeckLinkDisplayMode* getDisplayMode()
 108         {
 109                 mlt_profile profile = mlt_service_profile( MLT_CONSUMER_SERVICE( getConsumer() ) );
 110                 IDeckLinkDisplayModeIterator* iter;
 111                 IDeckLinkDisplayMode* mode;
 112                 IDeckLinkDisplayMode* result = 0;
 113
 114                 if ( m_deckLinkOutput->GetDisplayModeIterator( &iter ) == S_OK )
 115                 {
 116                         while ( !result && iter->Next( &mode ) == S_OK )
 117                         {
 118                                 m_width = mode->GetWidth();
 119                                 m_height = mode->GetHeight();
 120                                 mode->GetFrameRate( &m_duration, &m_timescale );
 121                                 m_fps = (double) m_timescale / m_duration;
 122                                 int p = mode->GetFieldDominance() == bmdProgressiveFrame;
 123                                 mlt_log_verbose( getConsumer(), "BMD mode %dx%d %.3f fps prog %d\n", m_width, m_height, m_fps, p );
 124
 125                                 if ( m_width == profile->width && m_height == profile->height && p == profile->progressive
 126                                          && m_fps == mlt_profile_fps( profile ) )
 127                                         result = mode;
 128                         }
 129                 }
 130
 131                 return result;
 132         }
 133
 134 public:
 135         mlt_consumer getConsumer()
 136                 { return &m_consumer; }
 137         uint64_t isBuffering() const
 138                 { return m_prerollCounter < m_preroll; }
 139
 140         ~DeckLinkConsumer()
 141         {
 142                 if ( m_deckLinkKeyer )
 143                         m_deckLinkKeyer->Release();
 144                 if ( m_deckLinkOutput )
 145                         m_deckLinkOutput->Release();
 146                 if ( m_deckLink )
 147                         m_deckLink->Release();
 148                 if ( m_videoFrameQ )
 149                 {
 150                         mlt_deque_close( m_videoFrameQ );
 151                         pthread_mutex_destroy( &m_mutex );
 152                         pthread_cond_destroy( &m_condition );
 153                 }
 154         }
 155
 156         bool open( unsigned card = 0 )
 157         {
 158                 IDeckLinkIterator* deckLinkIterator = CreateDeckLinkIteratorInstance();
 159                 unsigned i = 0;
 160
 161                 if ( !deckLinkIterator )
 162                 {
 163                         mlt_log_error( getConsumer(), "The DeckLink drivers not installed.\n" );
 164                         return false;
 165                 }
 166
 167                 // Connect to the Nth DeckLink instance
 168                 do {
 169                         if ( deckLinkIterator->Next( &m_deckLink ) != S_OK )
 170                         {
 171                                 mlt_log_error( getConsumer(), "DeckLink card not found\n" );
 172                                 deckLinkIterator->Release();
 173                                 return false;
 174                         }
 175                 } while ( ++i <= card );
 176                 deckLinkIterator->Release();
 177
 178                 // Obtain the audio/video output interface (IDeckLinkOutput)
 179                 if ( m_deckLink->QueryInterface( IID_IDeckLinkOutput, (void**)&m_deckLinkOutput ) != S_OK )
 180                 {
 181                         mlt_log_error( getConsumer(), "No DeckLink cards support output\n" );
 182                         m_deckLink->Release();
 183                         m_deckLink = 0;
 184                         return false;
 185                 }
 186
 187                 // Get the keyer interface
 188                 if ( m_deckLink->QueryInterface( IID_IDeckLinkKeyer, (void**) &m_deckLinkKeyer ) != S_OK )
 189                 {
 190                         mlt_log_error( getConsumer(), "Failed to get keyer\n" );
 191                         m_deckLinkOutput->Release();
 192                         m_deckLinkOutput = 0;
 193                         m_deckLink->Release();
 194                         m_deckLink = 0;
 195                         return false;
 196                 }
 197
 198                 // Provide this class as a delegate to the audio and video output interfaces
 199                 m_deckLinkOutput->SetScheduledFrameCompletionCallback( this );
 200                 m_deckLinkOutput->SetAudioCallback( this );
 201
 202                 pthread_mutex_init( &m_mutex, NULL );
 203                 pthread_cond_init( &m_condition, NULL );
 204                 m_maxAudioBuffer = bmdAudioSampleRate48kHz;
 205                 m_videoFrameQ = mlt_deque_init();
 206
 207                 return true;
 208         }
 209
 210         bool start( unsigned preroll )
 211         {
 212                 mlt_properties properties = MLT_CONSUMER_PROPERTIES( getConsumer() );
 213
 214                 // Initialize members
 215                 m_count = 0;
 216                 m_frame = 0;
 217                 m_dropped = 0;
 218                 m_isPrerolling = true;
 219                 m_prerollCounter = 0;
 220                 m_preroll = preroll < PREROLL_MINIMUM ? PREROLL_MINIMUM : preroll;
 221                 m_channels = mlt_properties_get_int( properties, "channels" );
 222                 m_isAudio = !mlt_properties_get_int( properties, "audio_off" );
 223
 224                 m_displayMode = getDisplayMode();
 225                 if ( !m_displayMode )
 226                 {
 227                         mlt_log_error( getConsumer(), "Profile is not compatible with decklink.\n" );
 228                         return false;
 229                 }
 230
 231                 // Set the keyer
 232                 if ( ( m_isKeyer = mlt_properties_get_int( properties, "keyer" ) ) )
 233                 {
 234                         bool external = false;
 235                         double level = mlt_properties_get_double( properties, "keyer_level" );
 236
 237                         if ( m_deckLinkKeyer->Enable( external ) != S_OK )
 238                                 mlt_log_error( getConsumer(), "Failed to enable keyer\n" );
 239                         m_deckLinkKeyer->SetLevel( level <= 1 ? ( level > 0 ? 255 * level : 255 ) : 255 );
 240                         m_preroll = 0;
 241                         m_isAudio = false;
 242                 }
 243                 else
 244                 {
 245                         m_deckLinkKeyer->Disable();
 246                 }
 247
 248                 // Set the video output mode
 249                 if ( S_OK != m_deckLinkOutput->EnableVideoOutput( m_displayMode->GetDisplayMode(), bmdVideoOutputFlagDefault) )
 250                 {
 251                         mlt_log_error( getConsumer(), "Failed to enable video output\n" );
 252                         return false;
 253                 }
 254
 255                 // Set the audio output mode
 256                 if ( !m_isAudio )
 257                 {
 258                         m_deckLinkOutput->DisableAudioOutput();
 259                         return true;
 260                 }
 261                 if ( S_OK != m_deckLinkOutput->EnableAudioOutput( bmdAudioSampleRate48kHz, bmdAudioSampleType16bitInteger,
 262                         m_channels, bmdAudioOutputStreamContinuous ) )
 263                 {
 264                         mlt_log_error( getConsumer(), "Failed to enable audio output\n" );
 265                         stop();
 266                         return false;
 267                 }
 268                 m_fifo = sample_fifo_init();
 269                 m_deckLinkOutput->BeginAudioPreroll();
 270
 271                 return true;
 272         }
 273
 274         void wakeup()
 275         {
 276                 pthread_mutex_lock( &m_mutex );
 277                 pthread_cond_broadcast( &m_condition );
 278                 pthread_mutex_unlock( &m_mutex );
 279         }
 280
 281         void wait()
 282         {
 283                 struct timeval tv;
 284                 struct timespec ts;
 285
 286                 gettimeofday( &tv, NULL );
 287                 ts.tv_sec = tv.tv_sec + 1;
 288                 ts.tv_nsec = tv.tv_usec * 1000;
 289                 pthread_mutex_lock( &m_mutex );
 290                 pthread_cond_timedwait( &m_condition, &m_mutex, &ts );
 291                 pthread_mutex_unlock( &m_mutex );
 292         }
 293
 294         void stop()
 295         {
 296                 // Stop the audio and video output streams immediately
 297                 if ( m_deckLinkOutput )
 298                 {
 299                         m_deckLinkOutput->StopScheduledPlayback( 0, 0, 0 );
 300                         m_deckLinkOutput->DisableAudioOutput();
 301                         m_deckLinkOutput->DisableVideoOutput();
 302                 }
 303                 while ( mlt_deque_count( m_videoFrameQ ) )
 304                 {
 305                         IDeckLinkMutableVideoFrame* frame = (IDeckLinkMutableVideoFrame*) mlt_deque_pop_back( m_videoFrameQ );
 306                         frame->Release();
 307                 }
 308                 if ( m_fifo ) sample_fifo_close( m_fifo );
 309                 mlt_frame_close( m_frame );
 310         }
 311
 312         void renderAudio( mlt_frame frame )
 313         {
 314                 mlt_audio_format format = mlt_audio_s16;
 315                 int frequency = bmdAudioSampleRate48kHz;
 316                 int samples = mlt_sample_calculator( m_fps, frequency, m_count );
 317                 int16_t *pcm = 0;
 318
 319                 if ( !mlt_frame_get_audio( frame, (void**) &pcm, &format, &frequency, &m_channels, &samples ) )
 320                 {
 321                         int count = samples;
 322
 323                         if ( !m_isPrerolling )
 324                         {
 325                                 uint32_t audioCount = 0;
 326                                 uint32_t videoCount = 0;
 327
 328                                 // Check for resync
 329                                 m_deckLinkOutput->GetBufferedAudioSampleFrameCount( &audioCount );
 330                                 m_deckLinkOutput->GetBufferedVideoFrameCount( &videoCount );
 331
 332                                 // Underflow typically occurs during non-normal speed playback.
 333                                 if ( audioCount < 1 || videoCount < 1 )
 334                                 {
 335                                         // Upon switching to normal playback, buffer some frames faster than realtime.
 336                                         mlt_log_info( getConsumer(), "buffer underrun: audio buf %u video buf %u frames\n", audioCount, videoCount );
 337                                         m_prerollCounter = 0;
 338                                 }
 339
 340                                 // While rebuffering
 341                                 if ( isBuffering() )
 342                                 {
 343                                         // Only append audio to reach the ideal level and not overbuffer.
 344                                         int ideal = ( m_preroll - 1 ) * bmdAudioSampleRate48kHz / m_fps;
 345                                         int actual = m_fifo->used / m_channels + audioCount;
 346                                         int diff = ideal / 2 - actual;
 347                                         count = diff < 0 ? 0 : diff < count ? diff : count;
 348                                 }
 349                         }
 350                         if ( count > 0 )
 351                                 sample_fifo_append( m_fifo, pcm, count * m_channels );
 352                 }
 353         }
 354
 355         bool createFrame()
 356         {
 357                 BMDPixelFormat format = m_isKeyer? bmdFormat8BitARGB : bmdFormat8BitYUV;
 358                 IDeckLinkMutableVideoFrame* frame = 0;
 359                 uint8_t *buffer = 0;
 360                 int stride = m_width * ( m_isKeyer? 4 : 2 );
 361
 362                 // Generate a DeckLink video frame
 363                 if ( S_OK != m_deckLinkOutput->CreateVideoFrame( m_width, m_height,
 364                         stride, format, bmdFrameFlagDefault, &frame ) )
 365                 {
 366                         mlt_log_verbose( getConsumer(), "Failed to create video frame\n" );
 367                         stop();
 368                         return false;
 369                 }
 370
 371                 // Make the first line black for field order correction.
 372                 if ( S_OK == frame->GetBytes( (void**) &buffer ) && buffer )
 373                 {
 374                         if ( m_isKeyer )
 375                         {
 376                                 memset( buffer, 0, stride );
 377                         }
 378                         else for ( int i = 0; i < m_width; i++ )
 379                         {
 380                                 *buffer++ = 128;
 381                                 *buffer++ = 16;
 382                         }
 383                 }
 384                 mlt_log_debug( getConsumer(), "created video frame\n" );
 385                 mlt_deque_push_back( m_videoFrameQ, frame );
 386
 387                 return true;
 388         }
 389
 390         void renderVideo()
 391         {
 392                 mlt_image_format format = m_isKeyer? mlt_image_rgb24a : mlt_image_yuv422;
 393                 uint8_t* image = 0;
 394
 395                 if ( !mlt_frame_get_image( m_frame, &image, &format, &m_width, &m_height, 0 ) )
 396                 {
 397                         IDeckLinkMutableVideoFrame* decklinkFrame = (IDeckLinkMutableVideoFrame*) mlt_deque_pop_back( m_videoFrameQ );
 398                         uint8_t* buffer = 0;
 399                         int stride = m_width * ( m_isKeyer? 4 : 2 );
 400
 401                         decklinkFrame->GetBytes( (void**) &buffer );
 402                         if ( buffer )
 403                         {
 404                                 int progressive = mlt_properties_get_int( MLT_FRAME_PROPERTIES( m_frame ), "progressive" );
 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( image, buffer + stride, stride * ( m_height - 1 ) );
 412                                         else
 413                                                 swab( image, buffer, stride * m_height );
 414                                 }
 415                                 else if ( !mlt_properties_get_int( MLT_FRAME_PROPERTIES( m_frame ), "test_image" ) )
 416                                 {
 417                                         // Normal keyer output
 418                                         int y = m_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                                                 m_height--;
 426                                                 d += stride;
 427                                         }
 428
 429                                         // Need to relocate alpha channel RGBA => ARGB
 430                                         while ( --y )
 431                                         {
 432                                                 int x = m_width + 1;
 433                                                 while ( --x )
 434                                                 {
 435                                                         *d++ = ( *s << 8 ) | ( *s >> 24 );
 436                                                         s++;
 437                                                 }
 438                                         }
 439                                 }
 440                                 else
 441                                 {
 442                                         // Keying blank frames - nullify alpha
 443                                         memset( buffer, 0, stride * m_height );
 444                                 }
 445                                 m_deckLinkOutput->ScheduleVideoFrame( decklinkFrame, m_count * m_duration, m_duration, m_timescale );
 446                         }
 447                         mlt_deque_push_front( m_videoFrameQ, decklinkFrame );
 448                 }
 449         }
 450
 451         HRESULT render( mlt_frame frame )
 452         {
 453                 HRESULT result = S_OK;
 454
 455                 // Get the audio
 456                 double speed = mlt_properties_get_double( MLT_FRAME_PROPERTIES(frame), "_speed" );
 457                 if ( m_isAudio && speed == 1.0 )
 458                         renderAudio( frame );
 459
 460                 // Create video frames while pre-rolling
 461                 if ( m_isPrerolling )
 462                 {
 463                         if ( !createFrame() )
 464                         {
 465                                 mlt_log_error( getConsumer(), "failed to create video frame\n" );
 466                                 return S_FALSE;
 467                         }
 468                 }
 469
 470                 if ( mlt_properties_get_int( MLT_FRAME_PROPERTIES( frame ), "rendered") )
 471                 {
 472                         // Close the previous frame and use the new one
 473                         mlt_frame_close( m_frame );
 474                         m_frame = frame;
 475                 }
 476                 else
 477                 {
 478                         if ( !m_frame )
 479                                 m_frame = frame;
 480                         // Reuse the last frame
 481                         mlt_log_verbose( getConsumer(), "dropped video frame %u\n", ++m_dropped );
 482                 }
 483
 484                 // Get the video
 485                 renderVideo();
 486                 ++m_count;
 487
 488                 // Check for end of pre-roll
 489                 if ( ++m_prerollCounter > m_preroll && m_isPrerolling )
 490                 {
 491                         // Start audio and video output
 492                         if ( m_isAudio )
 493                                 m_deckLinkOutput->EndAudioPreroll();
 494                         m_deckLinkOutput->StartScheduledPlayback( 0, m_timescale, 1.0 );
 495                         m_isPrerolling = false;
 496                 }
 497
 498                 return result;
 499         }
 500
 501         // *** DeckLink API implementation of IDeckLinkVideoOutputCallback IDeckLinkAudioOutputCallback *** //
 502
 503         // IUnknown needs only a dummy implementation
 504         virtual HRESULT STDMETHODCALLTYPE QueryInterface( REFIID iid, LPVOID *ppv )
 505                 { return E_NOINTERFACE; }
 506         virtual ULONG STDMETHODCALLTYPE AddRef()
 507                 { return 1; }
 508         virtual ULONG STDMETHODCALLTYPE Release()
 509                 { return 1; }
 510
 511         /************************* DeckLink API Delegate Methods *****************************/
 512
 513         virtual HRESULT STDMETHODCALLTYPE ScheduledFrameCompleted( IDeckLinkVideoFrame* completedFrame, BMDOutputFrameCompletionResult completed )
 514         {
 515                 // When a video frame has been released by the API, schedule another video frame to be output
 516                 wakeup();
 517
 518                 return S_OK;
 519         }
 520
 521         virtual HRESULT STDMETHODCALLTYPE ScheduledPlaybackHasStopped()
 522         {
 523                 return mlt_consumer_is_stopped( getConsumer() ) ? S_FALSE : S_OK;
 524         }
 525
 526         virtual HRESULT STDMETHODCALLTYPE RenderAudioSamples( bool preroll )
 527         {
 528                 // Provide more audio samples to the DeckLink API
 529                 HRESULT result = S_OK;
 530
 531                 uint32_t count = m_fifo->used / m_channels;
 532                 uint32_t buffered = count;
 533
 534                 if ( count
 535                         // Stay under preferred buffer level
 536                         && ( S_OK == m_deckLinkOutput->GetBufferedAudioSampleFrameCount( &buffered ) )
 537                         && buffered < m_maxAudioBuffer )
 538                 {
 539                         uint32_t written = 0;
 540
 541                         buffered = m_maxAudioBuffer - buffered;
 542                         count = buffered > count ? count : buffered;
 543                         result = m_deckLinkOutput->ScheduleAudioSamples( m_fifo->buffer, count, 0, 0, &written );
 544                         if ( written )
 545                                 sample_fifo_remove( m_fifo, written * m_channels );
 546                 }
 547
 548                 return result;
 549         }
 550 };
 551
 552 /** The main thread.
 553  */
 554
 555 static void *run( void *arg )
 556 {
 557         // Map the argument to the object
 558         DeckLinkConsumer* decklink = (DeckLinkConsumer*) arg;
 559         mlt_consumer consumer = decklink->getConsumer();
 560
 561         // Get the properties
 562         mlt_properties properties = MLT_CONSUMER_PROPERTIES( consumer );
 563
 564         // Convenience functionality
 565         int terminate_on_pause = mlt_properties_get_int( properties, "terminate_on_pause" );
 566         int terminated = 0;
 567
 568         // Frame and size
 569         mlt_frame frame = NULL;
 570
 571         // Loop while running
 572         while ( !terminated && mlt_properties_get_int( properties, "running" ) )
 573         {
 574                 // Get the frame
 575                 if ( ( frame = mlt_consumer_rt_frame( consumer ) ) )
 576                 {
 577                         // Check for termination
 578                         if ( terminate_on_pause )
 579                                 terminated = mlt_properties_get_double( MLT_FRAME_PROPERTIES( frame ), "_speed" ) == 0.0;
 580
 581                         decklink->render( frame );
 582                         if ( !decklink->isBuffering() )
 583                                 decklink->wait();
 584                         mlt_events_fire( properties, "consumer-frame-show", frame, NULL );
 585                 }
 586         }
 587
 588         // Indicate that the consumer is stopped
 589         decklink->stop();
 590         mlt_properties_set_int( properties, "running", 0 );
 591         mlt_consumer_stopped( consumer );
 592
 593         return NULL;
 594 }
 595
 596 /** Start the consumer.
 597  */
 598
 599 static int start( mlt_consumer consumer )
 600 {
 601         // Get the properties
 602         mlt_properties properties = MLT_CONSUMER_PROPERTIES( consumer );
 603         DeckLinkConsumer* decklink = (DeckLinkConsumer*) consumer->child;
 604         int result = decklink->start( mlt_properties_get_int( properties, "preroll" ) ) ? 0 : 1;
 605
 606         // Check that we're not already running
 607         if ( !result && !mlt_properties_get_int( properties, "running" ) )
 608         {
 609                 // Allocate a thread
 610                 pthread_t *pthread = (pthread_t*) calloc( 1, sizeof( pthread_t ) );
 611
 612                 // Assign the thread to properties
 613                 mlt_properties_set_data( properties, "pthread", pthread, sizeof( pthread_t ), free, NULL );
 614
 615                 // Set the running state
 616                 mlt_properties_set_int( properties, "running", 1 );
 617                 mlt_properties_set_int( properties, "joined", 0 );
 618
 619                 // Create the thread
 620                 pthread_create( pthread, NULL, run, consumer->child );
 621         }
 622         return result;
 623 }
 624
 625 /** Stop the consumer.
 626  */
 627
 628 static int stop( mlt_consumer consumer )
 629 {
 630         // Get the properties
 631         mlt_properties properties = MLT_CONSUMER_PROPERTIES( consumer );
 632
 633         // Check that we're running
 634         if ( !mlt_properties_get_int( properties, "joined" ) )
 635         {
 636                 // Get the thread
 637                 pthread_t *pthread = (pthread_t*) mlt_properties_get_data( properties, "pthread", NULL );
 638
 639                 if ( pthread )
 640                 {
 641                         // Stop the thread
 642                         mlt_properties_set_int( properties, "running", 0 );
 643                         mlt_properties_set_int( properties, "joined", 1 );
 644
 645                         // Wait for termination
 646                         pthread_join( *pthread, NULL );
 647                 }
 648         }
 649
 650         return 0;
 651 }
 652
 653 /** Determine if the consumer is stopped.
 654  */
 655
 656 static int is_stopped( mlt_consumer consumer )
 657 {
 658         // Get the properties
 659         mlt_properties properties = MLT_CONSUMER_PROPERTIES( consumer );
 660         return !mlt_properties_get_int( properties, "running" );
 661 }
 662
 663 /** Close the consumer.
 664  */
 665
 666 static void close( mlt_consumer consumer )
 667 {
 668         // Stop the consumer
 669         mlt_consumer_stop( consumer );
 670
 671         // Close the parent
 672         consumer->close = NULL;
 673         mlt_consumer_close( consumer );
 674
 675         // Free the memory
 676         delete (DeckLinkConsumer*) consumer->child;
 677 }
 678
 679 extern "C" {
 680
 681 /** Initialise the consumer.
 682  */
 683
 684 mlt_consumer consumer_decklink_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg )
 685 {
 686         // Allocate the consumer
 687         DeckLinkConsumer* decklink = new DeckLinkConsumer();
 688         mlt_consumer consumer = NULL;
 689
 690         // If allocated
 691         if ( decklink && !mlt_consumer_init( decklink->getConsumer(), decklink, profile ) )
 692         {
 693                 // If initialises without error
 694                 if ( decklink->open( arg? atoi(arg) : 0 ) )
 695                 {
 696                         consumer = decklink->getConsumer();
 697
 698                         // Setup callbacks
 699                         consumer->close = close;
 700                         consumer->start = start;
 701                         consumer->stop = stop;
 702                         consumer->is_stopped = is_stopped;
 703                 }
 704         }
 705
 706         // Return consumer
 707         return consumer;
 708 }
 709
 710 extern mlt_producer producer_decklink_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg );
 711
 712 static mlt_properties metadata( mlt_service_type type, const char *id, void *data )
 713 {
 714         char file[ PATH_MAX ];
 715         const char *service_type = NULL;
 716         switch ( type )
 717         {
 718                 case consumer_type:
 719                         service_type = "consumer";
 720                         break;
 721                 case producer_type:
 722                         service_type = "producer";
 723                         break;
 724                 default:
 725                         return NULL;
 726         }
 727         snprintf( file, PATH_MAX, "%s/decklink/%s_%s.yml", mlt_environment( "MLT_DATA" ), service_type, id );
 728         return mlt_properties_parse_yaml( file );
 729 }
 730
 731 MLT_REPOSITORY
 732 {
 733         MLT_REGISTER( consumer_type, "decklink", consumer_decklink_init );
 734         MLT_REGISTER( producer_type, "decklink", producer_decklink_init );
 735         MLT_REGISTER_METADATA( consumer_type, "decklink", metadata, NULL );
 736         MLT_REGISTER_METADATA( producer_type, "decklink", metadata, NULL );
 737 }
 738
 739 } // extern C