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