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         int                         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                 IDeckLinkAttributes *deckLinkAttributes = 0;
 189                 m_deckLinkKeyer = 0;
 190                 if ( m_deckLink->QueryInterface( IID_IDeckLinkAttributes, (void**) &deckLinkAttributes ) == S_OK )
 191                 {
 192                         bool flag = false;
 193                         if ( deckLinkAttributes->GetFlag( BMDDeckLinkSupportsInternalKeying, &flag ) == S_OK && flag )
 194                         {
 195                                 if ( m_deckLink->QueryInterface( IID_IDeckLinkKeyer, (void**) &m_deckLinkKeyer ) != S_OK )
 196                                 {
 197                                         mlt_log_error( getConsumer(), "Failed to get keyer\n" );
 198                                         m_deckLinkOutput->Release();
 199                                         m_deckLinkOutput = 0;
 200                                         m_deckLink->Release();
 201                                         m_deckLink = 0;
 202                                         return false;
 203                                 }
 204                         }
 205                         deckLinkAttributes->Release();
 206                 }
 207
 208                 // Provide this class as a delegate to the audio and video output interfaces
 209                 m_deckLinkOutput->SetScheduledFrameCompletionCallback( this );
 210                 m_deckLinkOutput->SetAudioCallback( this );
 211
 212                 pthread_mutex_init( &m_mutex, NULL );
 213                 pthread_cond_init( &m_condition, NULL );
 214                 m_maxAudioBuffer = bmdAudioSampleRate48kHz;
 215                 m_videoFrameQ = mlt_deque_init();
 216
 217                 return true;
 218         }
 219
 220         bool start( unsigned preroll )
 221         {
 222                 mlt_properties properties = MLT_CONSUMER_PROPERTIES( getConsumer() );
 223
 224                 // Initialize members
 225                 m_count = 0;
 226                 m_frame = 0;
 227                 m_dropped = 0;
 228                 m_isPrerolling = true;
 229                 m_prerollCounter = 0;
 230                 m_preroll = preroll < PREROLL_MINIMUM ? PREROLL_MINIMUM : preroll;
 231                 m_channels = mlt_properties_get_int( properties, "channels" );
 232                 m_isAudio = !mlt_properties_get_int( properties, "audio_off" );
 233
 234                 m_displayMode = getDisplayMode();
 235                 if ( !m_displayMode )
 236                 {
 237                         mlt_log_error( getConsumer(), "Profile is not compatible with decklink.\n" );
 238                         return false;
 239                 }
 240
 241                 // Set the keyer
 242                 if ( m_deckLinkKeyer && ( m_isKeyer = mlt_properties_get_int( properties, "keyer" ) ) )
 243                 {
 244                         bool external = (m_isKeyer == 2);
 245                         double level = mlt_properties_get_double( properties, "keyer_level" );
 246
 247                         if ( m_deckLinkKeyer->Enable( external ) != S_OK )
 248                                 mlt_log_error( getConsumer(), "Failed to enable %s keyer\n",
 249                                         external ? "external" : "internal" );
 250                         m_deckLinkKeyer->SetLevel( level <= 1 ? ( level > 0 ? 255 * level : 255 ) : 255 );
 251                         m_preroll = 0;
 252                         m_isAudio = false;
 253                 }
 254                 else if ( m_deckLinkKeyer )
 255                 {
 256                         m_deckLinkKeyer->Disable();
 257                 }
 258
 259                 // Set the video output mode
 260                 if ( S_OK != m_deckLinkOutput->EnableVideoOutput( m_displayMode->GetDisplayMode(), bmdVideoOutputFlagDefault) )
 261                 {
 262                         mlt_log_error( getConsumer(), "Failed to enable video output\n" );
 263                         return false;
 264                 }
 265
 266                 // Set the audio output mode
 267                 if ( !m_isAudio )
 268                 {
 269                         m_deckLinkOutput->DisableAudioOutput();
 270                         return true;
 271                 }
 272                 if ( S_OK != m_deckLinkOutput->EnableAudioOutput( bmdAudioSampleRate48kHz, bmdAudioSampleType16bitInteger,
 273                         m_channels, bmdAudioOutputStreamContinuous ) )
 274                 {
 275                         mlt_log_error( getConsumer(), "Failed to enable audio output\n" );
 276                         stop();
 277                         return false;
 278                 }
 279                 m_fifo = sample_fifo_init();
 280                 m_deckLinkOutput->BeginAudioPreroll();
 281
 282                 return true;
 283         }
 284
 285         void wakeup()
 286         {
 287                 pthread_mutex_lock( &m_mutex );
 288                 pthread_cond_broadcast( &m_condition );
 289                 pthread_mutex_unlock( &m_mutex );
 290         }
 291
 292         void wait()
 293         {
 294                 struct timeval tv;
 295                 struct timespec ts;
 296
 297                 gettimeofday( &tv, NULL );
 298                 ts.tv_sec = tv.tv_sec + 1;
 299                 ts.tv_nsec = tv.tv_usec * 1000;
 300                 pthread_mutex_lock( &m_mutex );
 301                 pthread_cond_timedwait( &m_condition, &m_mutex, &ts );
 302                 pthread_mutex_unlock( &m_mutex );
 303         }
 304
 305         void stop()
 306         {
 307                 // Stop the audio and video output streams immediately
 308                 if ( m_deckLinkOutput )
 309                 {
 310                         m_deckLinkOutput->StopScheduledPlayback( 0, 0, 0 );
 311                         m_deckLinkOutput->DisableAudioOutput();
 312                         m_deckLinkOutput->DisableVideoOutput();
 313                 }
 314                 while ( mlt_deque_count( m_videoFrameQ ) )
 315                 {
 316                         IDeckLinkMutableVideoFrame* frame = (IDeckLinkMutableVideoFrame*) mlt_deque_pop_back( m_videoFrameQ );
 317                         frame->Release();
 318                 }
 319                 if ( m_fifo ) sample_fifo_close( m_fifo );
 320                 mlt_frame_close( m_frame );
 321         }
 322
 323         void renderAudio( mlt_frame frame )
 324         {
 325                 mlt_audio_format format = mlt_audio_s16;
 326                 int frequency = bmdAudioSampleRate48kHz;
 327                 int samples = mlt_sample_calculator( m_fps, frequency, m_count );
 328                 int16_t *pcm = 0;
 329
 330                 if ( !mlt_frame_get_audio( frame, (void**) &pcm, &format, &frequency, &m_channels, &samples ) )
 331                 {
 332                         int count = samples;
 333
 334                         if ( !m_isPrerolling )
 335                         {
 336                                 uint32_t audioCount = 0;
 337                                 uint32_t videoCount = 0;
 338
 339                                 // Check for resync
 340                                 m_deckLinkOutput->GetBufferedAudioSampleFrameCount( &audioCount );
 341                                 m_deckLinkOutput->GetBufferedVideoFrameCount( &videoCount );
 342
 343                                 // Underflow typically occurs during non-normal speed playback.
 344                                 if ( audioCount < 1 || videoCount < 1 )
 345                                 {
 346                                         // Upon switching to normal playback, buffer some frames faster than realtime.
 347                                         mlt_log_info( getConsumer(), "buffer underrun: audio buf %u video buf %u frames\n", audioCount, videoCount );
 348                                         m_prerollCounter = 0;
 349                                 }
 350
 351                                 // While rebuffering
 352                                 if ( videoCount == 0 && isBuffering() )
 353                                 {
 354                                         // Only append audio to reach the ideal level and not overbuffer.
 355                                         int ideal = ( m_preroll - 1 ) * bmdAudioSampleRate48kHz / m_fps;
 356                                         int actual = m_fifo->used / m_channels + audioCount;
 357                                         int diff = ideal / 2 - actual;
 358                                         count = diff < 0 ? 0 : diff < count ? diff : count;
 359                                 }
 360                         }
 361                         if ( count > 0 )
 362                                 sample_fifo_append( m_fifo, pcm, count * m_channels );
 363                 }
 364         }
 365
 366         bool createFrame()
 367         {
 368                 BMDPixelFormat format = m_isKeyer? bmdFormat8BitARGB : bmdFormat8BitYUV;
 369                 IDeckLinkMutableVideoFrame* frame = 0;
 370                 uint8_t *buffer = 0;
 371                 int stride = m_width * ( m_isKeyer? 4 : 2 );
 372
 373                 // Generate a DeckLink video frame
 374                 if ( S_OK != m_deckLinkOutput->CreateVideoFrame( m_width, m_height,
 375                         stride, format, bmdFrameFlagDefault, &frame ) )
 376                 {
 377                         mlt_log_verbose( getConsumer(), "Failed to create video frame\n" );
 378                         stop();
 379                         return false;
 380                 }
 381
 382                 // Make the first line black for field order correction.
 383                 if ( S_OK == frame->GetBytes( (void**) &buffer ) && buffer )
 384                 {
 385                         if ( m_isKeyer )
 386                         {
 387                                 memset( buffer, 0, stride );
 388                         }
 389                         else for ( int i = 0; i < m_width; i++ )
 390                         {
 391                                 *buffer++ = 128;
 392                                 *buffer++ = 16;
 393                         }
 394                 }
 395                 mlt_log_debug( getConsumer(), "created video frame\n" );
 396                 mlt_deque_push_back( m_videoFrameQ, frame );
 397
 398                 return true;
 399         }
 400
 401         void renderVideo()
 402         {
 403                 mlt_image_format format = m_isKeyer? mlt_image_rgb24a : mlt_image_yuv422;
 404                 uint8_t* image = 0;
 405
 406                 if ( !mlt_frame_get_image( m_frame, &image, &format, &m_width, &m_height, 0 ) )
 407                 {
 408                         IDeckLinkMutableVideoFrame* decklinkFrame = (IDeckLinkMutableVideoFrame*) mlt_deque_pop_back( m_videoFrameQ );
 409                         uint8_t* buffer = 0;
 410                         int stride = m_width * ( m_isKeyer? 4 : 2 );
 411
 412                         decklinkFrame->GetBytes( (void**) &buffer );
 413                         if ( buffer )
 414                         {
 415                                 int progressive = mlt_properties_get_int( MLT_FRAME_PROPERTIES( m_frame ), "progressive" );
 416
 417                                 if ( !m_isKeyer )
 418                                 {
 419                                         // Normal non-keyer playout - needs byte swapping
 420                                         if ( !progressive && m_displayMode->GetFieldDominance() == bmdUpperFieldFirst )
 421                                                 // convert lower field first to top field first
 422                                                 swab( image, buffer + stride, stride * ( m_height - 1 ) );
 423                                         else
 424                                                 swab( image, buffer, stride * m_height );
 425                                 }
 426                                 else if ( !mlt_properties_get_int( MLT_FRAME_PROPERTIES( m_frame ), "test_image" ) )
 427                                 {
 428                                         // Normal keyer output
 429                                         int y = m_height + 1;
 430                                         uint32_t* s = (uint32_t*) image;
 431                                         uint32_t* d = (uint32_t*) buffer;
 432
 433                                         if ( !progressive && m_displayMode->GetFieldDominance() == bmdUpperFieldFirst )
 434                                         {
 435                                                 // Correct field order
 436                                                 m_height--;
 437                                                 y--;
 438                                                 d += m_width;
 439                                         }
 440
 441                                         // Need to relocate alpha channel RGBA => ARGB
 442                                         while ( --y )
 443                                         {
 444                                                 int x = m_width + 1;
 445                                                 while ( --x )
 446                                                 {
 447                                                         *d++ = ( *s << 8 ) | ( *s >> 24 );
 448                                                         s++;
 449                                                 }
 450                                         }
 451                                 }
 452                                 else
 453                                 {
 454                                         // Keying blank frames - nullify alpha
 455                                         memset( buffer, 0, stride * m_height );
 456                                 }
 457                                 m_deckLinkOutput->ScheduleVideoFrame( decklinkFrame, m_count * m_duration, m_duration, m_timescale );
 458                         }
 459                         mlt_deque_push_front( m_videoFrameQ, decklinkFrame );
 460                 }
 461         }
 462
 463         HRESULT render( mlt_frame frame )
 464         {
 465                 HRESULT result = S_OK;
 466
 467                 // Get the audio
 468                 double speed = mlt_properties_get_double( MLT_FRAME_PROPERTIES(frame), "_speed" );
 469                 if ( m_isAudio && speed == 1.0 )
 470                         renderAudio( frame );
 471
 472                 // Create video frames while pre-rolling
 473                 if ( m_isPrerolling )
 474                 {
 475                         if ( !createFrame() )
 476                         {
 477                                 mlt_log_error( getConsumer(), "failed to create video frame\n" );
 478                                 return S_FALSE;
 479                         }
 480                 }
 481
 482                 if ( mlt_properties_get_int( MLT_FRAME_PROPERTIES( frame ), "rendered") )
 483                 {
 484                         // Close the previous frame and use the new one
 485                         mlt_frame_close( m_frame );
 486                         m_frame = frame;
 487                 }
 488                 else
 489                 {
 490                         if ( !m_frame )
 491                                 m_frame = frame;
 492                         // Reuse the last frame
 493                         mlt_log_verbose( getConsumer(), "dropped video frame %u\n", ++m_dropped );
 494                 }
 495
 496                 // Get the video
 497                 renderVideo();
 498                 ++m_count;
 499
 500                 // Check for end of pre-roll
 501                 if ( ++m_prerollCounter > m_preroll && m_isPrerolling )
 502                 {
 503                         // Start audio and video output
 504                         if ( m_isAudio )
 505                                 m_deckLinkOutput->EndAudioPreroll();
 506                         m_deckLinkOutput->StartScheduledPlayback( 0, m_timescale, 1.0 );
 507                         m_isPrerolling = false;
 508                 }
 509
 510                 return result;
 511         }
 512
 513         // *** DeckLink API implementation of IDeckLinkVideoOutputCallback IDeckLinkAudioOutputCallback *** //
 514
 515         // IUnknown needs only a dummy implementation
 516         virtual HRESULT STDMETHODCALLTYPE QueryInterface( REFIID iid, LPVOID *ppv )
 517                 { return E_NOINTERFACE; }
 518         virtual ULONG STDMETHODCALLTYPE AddRef()
 519                 { return 1; }
 520         virtual ULONG STDMETHODCALLTYPE Release()
 521                 { return 1; }
 522
 523         /************************* DeckLink API Delegate Methods *****************************/
 524
 525         virtual HRESULT STDMETHODCALLTYPE ScheduledFrameCompleted( IDeckLinkVideoFrame* completedFrame, BMDOutputFrameCompletionResult completed )
 526         {
 527                 // When a video frame has been released by the API, schedule another video frame to be output
 528                 wakeup();
 529
 530                 return S_OK;
 531         }
 532
 533         virtual HRESULT STDMETHODCALLTYPE ScheduledPlaybackHasStopped()
 534         {
 535                 return mlt_consumer_is_stopped( getConsumer() ) ? S_FALSE : S_OK;
 536         }
 537
 538         virtual HRESULT STDMETHODCALLTYPE RenderAudioSamples( bool preroll )
 539         {
 540                 // Provide more audio samples to the DeckLink API
 541                 HRESULT result = S_OK;
 542
 543                 uint32_t count = m_fifo->used / m_channels;
 544                 uint32_t buffered = count;
 545
 546                 if ( count
 547                         // Stay under preferred buffer level
 548                         && ( S_OK == m_deckLinkOutput->GetBufferedAudioSampleFrameCount( &buffered ) )
 549                         && buffered < m_maxAudioBuffer )
 550                 {
 551                         uint32_t written = 0;
 552
 553                         buffered = m_maxAudioBuffer - buffered;
 554                         count = buffered > count ? count : buffered;
 555                         result = m_deckLinkOutput->ScheduleAudioSamples( m_fifo->buffer, count, 0, 0, &written );
 556                         if ( written )
 557                                 sample_fifo_remove( m_fifo, written * m_channels );
 558                 }
 559
 560                 return result;
 561         }
 562 };
 563
 564 /** The main thread.
 565  */
 566
 567 static void *run( void *arg )
 568 {
 569         // Map the argument to the object
 570         DeckLinkConsumer* decklink = (DeckLinkConsumer*) arg;
 571         mlt_consumer consumer = decklink->getConsumer();
 572
 573         // Get the properties
 574         mlt_properties properties = MLT_CONSUMER_PROPERTIES( consumer );
 575
 576         // Convenience functionality
 577         int terminate_on_pause = mlt_properties_get_int( properties, "terminate_on_pause" );
 578         int terminated = 0;
 579
 580         // Frame and size
 581         mlt_frame frame = NULL;
 582
 583         // Loop while running
 584         while ( !terminated && mlt_properties_get_int( properties, "running" ) )
 585         {
 586                 // Get the frame
 587                 if ( ( frame = mlt_consumer_rt_frame( consumer ) ) )
 588                 {
 589                         // Check for termination
 590                         if ( terminate_on_pause )
 591                                 terminated = mlt_properties_get_double( MLT_FRAME_PROPERTIES( frame ), "_speed" ) == 0.0;
 592
 593                         decklink->render( frame );
 594                         if ( !decklink->isBuffering() )
 595                                 decklink->wait();
 596                         mlt_events_fire( properties, "consumer-frame-show", frame, NULL );
 597                 }
 598         }
 599
 600         // Indicate that the consumer is stopped
 601         decklink->stop();
 602         mlt_properties_set_int( properties, "running", 0 );
 603         mlt_consumer_stopped( consumer );
 604
 605         return NULL;
 606 }
 607
 608 /** Start the consumer.
 609  */
 610
 611 static int start( mlt_consumer consumer )
 612 {
 613         // Get the properties
 614         mlt_properties properties = MLT_CONSUMER_PROPERTIES( consumer );
 615         DeckLinkConsumer* decklink = (DeckLinkConsumer*) consumer->child;
 616         int result = decklink->start( mlt_properties_get_int( properties, "preroll" ) ) ? 0 : 1;
 617
 618         // Check that we're not already running
 619         if ( !result && !mlt_properties_get_int( properties, "running" ) )
 620         {
 621                 // Allocate a thread
 622                 pthread_t *pthread = (pthread_t*) calloc( 1, sizeof( pthread_t ) );
 623
 624                 // Assign the thread to properties
 625                 mlt_properties_set_data( properties, "pthread", pthread, sizeof( pthread_t ), free, NULL );
 626
 627                 // Set the running state
 628                 mlt_properties_set_int( properties, "running", 1 );
 629                 mlt_properties_set_int( properties, "joined", 0 );
 630
 631                 // Create the thread
 632                 pthread_create( pthread, NULL, run, consumer->child );
 633         }
 634         return result;
 635 }
 636
 637 /** Stop the consumer.
 638  */
 639
 640 static int stop( mlt_consumer consumer )
 641 {
 642         // Get the properties
 643         mlt_properties properties = MLT_CONSUMER_PROPERTIES( consumer );
 644
 645         // Check that we're running
 646         if ( !mlt_properties_get_int( properties, "joined" ) )
 647         {
 648                 // Get the thread
 649                 pthread_t *pthread = (pthread_t*) mlt_properties_get_data( properties, "pthread", NULL );
 650
 651                 if ( pthread )
 652                 {
 653                         // Stop the thread
 654                         mlt_properties_set_int( properties, "running", 0 );
 655                         mlt_properties_set_int( properties, "joined", 1 );
 656
 657                         // Wait for termination
 658                         pthread_join( *pthread, NULL );
 659                 }
 660         }
 661
 662         return 0;
 663 }
 664
 665 /** Determine if the consumer is stopped.
 666  */
 667
 668 static int is_stopped( mlt_consumer consumer )
 669 {
 670         // Get the properties
 671         mlt_properties properties = MLT_CONSUMER_PROPERTIES( consumer );
 672         return !mlt_properties_get_int( properties, "running" );
 673 }
 674
 675 /** Close the consumer.
 676  */
 677
 678 static void close( mlt_consumer consumer )
 679 {
 680         // Stop the consumer
 681         mlt_consumer_stop( consumer );
 682
 683         // Close the parent
 684         consumer->close = NULL;
 685         mlt_consumer_close( consumer );
 686
 687         // Free the memory
 688         delete (DeckLinkConsumer*) consumer->child;
 689 }
 690
 691 extern "C" {
 692
 693 /** Initialise the consumer.
 694  */
 695
 696 mlt_consumer consumer_decklink_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg )
 697 {
 698         // Allocate the consumer
 699         DeckLinkConsumer* decklink = new DeckLinkConsumer();
 700         mlt_consumer consumer = NULL;
 701
 702         // If allocated
 703         if ( decklink && !mlt_consumer_init( decklink->getConsumer(), decklink, profile ) )
 704         {
 705                 // If initialises without error
 706                 if ( decklink->open( arg? atoi(arg) : 0 ) )
 707                 {
 708                         consumer = decklink->getConsumer();
 709
 710                         // Setup callbacks
 711                         consumer->close = close;
 712                         consumer->start = start;
 713                         consumer->stop = stop;
 714                         consumer->is_stopped = is_stopped;
 715                 }
 716         }
 717
 718         // Return consumer
 719         return consumer;
 720 }
 721
 722 extern mlt_producer producer_decklink_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg );
 723
 724 static mlt_properties metadata( mlt_service_type type, const char *id, void *data )
 725 {
 726         char file[ PATH_MAX ];
 727         const char *service_type = NULL;
 728         switch ( type )
 729         {
 730                 case consumer_type:
 731                         service_type = "consumer";
 732                         break;
 733                 case producer_type:
 734                         service_type = "producer";
 735                         break;
 736                 default:
 737                         return NULL;
 738         }
 739         snprintf( file, PATH_MAX, "%s/decklink/%s_%s.yml", mlt_environment( "MLT_DATA" ), service_type, id );
 740         return mlt_properties_parse_yaml( file );
 741 }
 742
 743 MLT_REPOSITORY
 744 {
 745         MLT_REGISTER( consumer_type, "decklink", consumer_decklink_init );
 746         MLT_REGISTER( producer_type, "decklink", producer_decklink_init );
 747         MLT_REGISTER_METADATA( consumer_type, "decklink", metadata, NULL );
 748         MLT_REGISTER_METADATA( producer_type, "decklink", metadata, NULL );
 749 }
 750
 751 } // extern C