git.sesse.net Git - mlt/blob - src/modules/decklink/producer_decklink.cpp

   1 /*
   2  * producer_decklink.c -- input from Blackmagic Design DeckLink
   3  * Copyright (C) 2011 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 <pthread.h>
  23 #include <string.h>
  24 #include <unistd.h>
  25 #include <limits.h>
  26 #include <sys/time.h>
  27 #ifdef WIN32
  28 #include <objbase.h>
  29 #include "DeckLinkAPI_h.h"
  30 #else
  31 #include "DeckLinkAPI.h"
  32 #endif
  33
  34 class DeckLinkProducer
  35         : public IDeckLinkInputCallback
  36 {
  37 private:
  38         mlt_producer     m_producer;
  39         IDeckLink*       m_decklink;
  40         IDeckLinkInput*  m_decklinkInput;
  41         mlt_deque        m_queue;
  42         pthread_mutex_t  m_mutex;
  43         pthread_cond_t   m_condition;
  44         bool             m_started;
  45         int              m_dropped;
  46         bool             m_isBuffering;
  47         int              m_topFieldFirst;
  48         int              m_colorspace;
  49         int              m_vancLines;
  50         mlt_cache        m_cache;
  51
  52         BMDDisplayMode getDisplayMode( mlt_profile profile, int vancLines )
  53         {
  54                 IDeckLinkDisplayModeIterator* iter;
  55                 IDeckLinkDisplayMode* mode;
  56                 BMDDisplayMode result = (BMDDisplayMode) bmdDisplayModeNotSupported;
  57
  58                 if ( m_decklinkInput->GetDisplayModeIterator( &iter ) == S_OK )
  59                 {
  60                         while ( !result && iter->Next( &mode ) == S_OK )
  61                         {
  62                                 int width = mode->GetWidth();
  63                                 int height = mode->GetHeight();
  64                                 BMDTimeValue duration;
  65                                 BMDTimeScale timescale;
  66                                 mode->GetFrameRate( &duration, &timescale );
  67                                 double fps = (double) timescale / duration;
  68                                 int p = mode->GetFieldDominance() == bmdProgressiveFrame;
  69                                 m_topFieldFirst = mode->GetFieldDominance() == bmdUpperFieldFirst;
  70                                 m_colorspace = ( mode->GetFlags() & bmdDisplayModeColorspaceRec709 ) ? 709 : 601;
  71                                 mlt_log_verbose( getProducer(), "BMD mode %dx%d %.3f fps prog %d tff %d\n", width, height, fps, p, m_topFieldFirst );
  72
  73                                 if ( width == profile->width && p == profile->progressive
  74                                          && ( height + vancLines == profile->height || ( height == 486 && profile->height == 480 + vancLines ) )
  75                                          && fps == mlt_profile_fps( profile ) )
  76                                         result = mode->GetDisplayMode();
  77                         }
  78                 }
  79
  80                 return result;
  81         }
  82
  83 public:
  84
  85         void setProducer( mlt_producer producer )
  86                 { m_producer = producer; }
  87
  88         mlt_producer getProducer() const
  89                 { return m_producer; }
  90
  91         ~DeckLinkProducer()
  92         {
  93                 if ( m_queue )
  94                 {
  95                         stop();
  96                         mlt_deque_close( m_queue );
  97                         pthread_mutex_destroy( &m_mutex );
  98                         pthread_cond_destroy( &m_condition );
  99                         mlt_cache_close( m_cache );
 100                 }
 101                 if ( m_decklinkInput )
 102                         m_decklinkInput->Release();
 103                 if ( m_decklink )
 104                         m_decklink->Release();
 105         }
 106
 107         bool open( unsigned card =  0 )
 108         {
 109                 IDeckLinkIterator* decklinkIterator = NULL;
 110                 try
 111                 {
 112 #ifdef WIN32
 113                         HRESULT result =  CoInitialize( NULL );
 114                         if ( FAILED( result ) )
 115                                 throw "COM initialization failed";
 116                         result = CoCreateInstance( CLSID_CDeckLinkIterator, NULL, CLSCTX_ALL, IID_IDeckLinkIterator, (void**) &decklinkIterator );
 117                         if ( FAILED( result ) )
 118                                 throw "The DeckLink drivers are not installed.";
 119 #else
 120                         decklinkIterator = CreateDeckLinkIteratorInstance();
 121                         if ( !decklinkIterator )
 122                                 throw "The DeckLink drivers are not installed.";
 123 #endif
 124
 125                         // Connect to the Nth DeckLink instance
 126                         unsigned i = 0;
 127                         do {
 128                                 if ( decklinkIterator->Next( &m_decklink ) != S_OK )
 129                                         throw "DeckLink card not found.";
 130                         } while ( ++i <= card );
 131                         decklinkIterator->Release();
 132
 133                         // Get the input interface
 134                         if ( m_decklink->QueryInterface( IID_IDeckLinkInput, (void**) &m_decklinkInput ) != S_OK )
 135                                 throw "No DeckLink cards support input.";
 136
 137                         // Provide this class as a delegate to the input callback
 138                         m_decklinkInput->SetCallback( this );
 139
 140                         // Initialize other members
 141                         pthread_mutex_init( &m_mutex, NULL );
 142                         pthread_cond_init( &m_condition, NULL );
 143                         m_queue = mlt_deque_init();
 144                         m_started = false;
 145                         m_dropped = 0;
 146                         m_isBuffering = true;
 147                         m_cache = mlt_cache_init();
 148
 149                         // 3 covers YADIF and increasing framerate use cases
 150                         mlt_cache_set_size( m_cache, 3 );
 151                 }
 152                 catch ( const char *error )
 153                 {
 154                         if ( decklinkIterator )
 155                                 decklinkIterator->Release();
 156                         mlt_log_error( getProducer(), "%s\n", error );
 157                         return false;
 158                 }
 159                 return true;
 160         }
 161
 162         bool start( mlt_profile profile = 0 )
 163         {
 164                 if ( m_started )
 165                         return false;
 166                 try
 167                 {
 168                         // Initialize some members
 169                         m_vancLines = mlt_properties_get_int( MLT_PRODUCER_PROPERTIES( getProducer() ), "vanc" );
 170                         if ( m_vancLines == -1 )
 171                                 m_vancLines = profile->height <= 512 ? 26 : 32;
 172
 173                         if ( !profile )
 174                                 profile = mlt_service_profile( MLT_PRODUCER_SERVICE( getProducer() ) );
 175
 176                         // Get the display mode
 177                         BMDDisplayMode displayMode = getDisplayMode( profile, m_vancLines );
 178                         if ( displayMode == (BMDDisplayMode) bmdDisplayModeNotSupported )
 179                         {
 180                                 mlt_log_info( getProducer(), "profile = %dx%d %f fps %s\n", profile->width, profile->height,
 181                                                           mlt_profile_fps( profile ), profile->progressive? "progressive" : "interlace" );
 182                                 throw "Profile is not compatible with decklink.";
 183                         }
 184
 185                         // Determine if supports input format detection
 186 #ifdef WIN32
 187                         BOOL doesDetectFormat = FALSE;
 188 #else
 189                         bool doesDetectFormat = false;
 190 #endif
 191                         IDeckLinkAttributes *decklinkAttributes = 0;
 192                         if ( m_decklink->QueryInterface( IID_IDeckLinkAttributes, (void**) &decklinkAttributes ) == S_OK )
 193                         {
 194                                 if ( decklinkAttributes->GetFlag( BMDDeckLinkSupportsInputFormatDetection, &doesDetectFormat ) != S_OK )
 195                                         doesDetectFormat = false;
 196                                 decklinkAttributes->Release();
 197                         }
 198                         mlt_log_verbose( getProducer(), "%s format detection\n", doesDetectFormat ? "supports" : "does not support" );
 199
 200                         // Enable video capture
 201                         BMDPixelFormat pixelFormat = bmdFormat8BitYUV;
 202                         BMDVideoInputFlags flags = doesDetectFormat ? bmdVideoInputEnableFormatDetection : bmdVideoInputFlagDefault;
 203                         if ( S_OK != m_decklinkInput->EnableVideoInput( displayMode, pixelFormat, flags ) )
 204                                 throw "Failed to enable video capture.";
 205
 206                         // Enable audio capture
 207                         BMDAudioSampleRate sampleRate = bmdAudioSampleRate48kHz;
 208                         BMDAudioSampleType sampleType = bmdAudioSampleType16bitInteger;
 209                         int channels = mlt_properties_get_int( MLT_PRODUCER_PROPERTIES( getProducer() ), "channels" );
 210                         if ( S_OK != m_decklinkInput->EnableAudioInput( sampleRate, sampleType, channels ) )
 211                                 throw "Failed to enable audio capture.";
 212
 213                         // Start capture
 214                         m_dropped = 0;
 215                         mlt_properties_set_int( MLT_PRODUCER_PROPERTIES( getProducer() ), "dropped", m_dropped );
 216                         m_started = m_decklinkInput->StartStreams() == S_OK;
 217                         if ( !m_started )
 218                                 throw "Failed to start capture.";
 219                 }
 220                 catch ( const char *error )
 221                 {
 222                         m_decklinkInput->DisableVideoInput();
 223                         mlt_log_error( getProducer(), "%s\n", error );
 224                         return false;
 225                 }
 226                 return true;
 227         }
 228
 229         void stop()
 230         {
 231                 if ( !m_started )
 232                         return;
 233                 m_started = false;
 234
 235                 // Release the wait in getFrame
 236                 pthread_mutex_lock( &m_mutex );
 237                 pthread_cond_broadcast( &m_condition );
 238                 pthread_mutex_unlock( &m_mutex );
 239
 240                 m_decklinkInput->StopStreams();
 241
 242                 // Cleanup queue
 243                 pthread_mutex_lock( &m_mutex );
 244                 while ( mlt_frame frame = (mlt_frame) mlt_deque_pop_back( m_queue ) )
 245                         mlt_frame_close( frame );
 246                 pthread_mutex_unlock( &m_mutex );
 247         }
 248
 249         mlt_frame getFrame()
 250         {
 251                 mlt_frame frame = NULL;
 252                 struct timeval now;
 253                 struct timespec tm;
 254                 double fps = mlt_producer_get_fps( getProducer() );
 255                 mlt_position position = mlt_producer_position( getProducer() );
 256                 mlt_cache_item cached = mlt_cache_get( m_cache, (void*) position );
 257
 258                 // Allow the buffer to fill to the requested initial buffer level.
 259                 if ( m_isBuffering )
 260                 {
 261                         int prefill = mlt_properties_get_int( MLT_PRODUCER_PROPERTIES( getProducer() ), "prefill" );
 262                         int buffer = mlt_properties_get_int( MLT_PRODUCER_PROPERTIES( getProducer() ), "buffer" );
 263
 264                         m_isBuffering = false;
 265                         prefill = prefill > buffer ? buffer : prefill;
 266                         pthread_mutex_lock( &m_mutex );
 267                         while ( mlt_deque_count( m_queue ) < prefill )
 268                         {
 269                                 // Wait up to buffer/fps seconds
 270                                 gettimeofday( &now, NULL );
 271                                 long usec = now.tv_sec * 1000000 + now.tv_usec;
 272                                 usec += 1000000 * buffer / fps;
 273                                 tm.tv_sec = usec / 1000000;
 274                                 tm.tv_nsec = (usec % 1000000) * 1000;
 275                                 if ( pthread_cond_timedwait( &m_condition, &m_mutex, &tm ) )
 276                                         break;
 277                         }
 278                         pthread_mutex_unlock( &m_mutex );
 279                 }
 280
 281                 if ( cached )
 282                 {
 283                         // Copy cached frame instead of pulling from queue
 284                         frame = mlt_frame_clone( (mlt_frame) mlt_cache_item_data( cached, NULL ), 0 );
 285                         mlt_cache_item_close( cached );
 286                 }
 287                 else
 288                 {
 289                         // Wait if queue is empty
 290                         pthread_mutex_lock( &m_mutex );
 291                         while ( mlt_deque_count( m_queue ) < 1 )
 292                         {
 293                                 // Wait up to twice frame duration
 294                                 gettimeofday( &now, NULL );
 295                                 long usec = now.tv_sec * 1000000 + now.tv_usec;
 296                                 usec += 2000000 / fps;
 297                                 tm.tv_sec = usec / 1000000;
 298                                 tm.tv_nsec = (usec % 1000000) * 1000;
 299                                 if ( pthread_cond_timedwait( &m_condition, &m_mutex, &tm ) )
 300                                         // Stop waiting if error (timed out)
 301                                         break;
 302                         }
 303                         frame = ( mlt_frame ) mlt_deque_pop_front( m_queue );
 304                         pthread_mutex_unlock( &m_mutex );
 305
 306                         // add to cache
 307                         if ( frame )
 308                                 mlt_cache_put( m_cache, (void*) position, mlt_frame_clone( frame, 1 ), 0,
 309                                         (mlt_destructor) mlt_frame_close );
 310                 }
 311
 312                 // Set frame timestamp and properties
 313                 if ( frame )
 314                 {
 315                         mlt_profile profile = mlt_service_profile( MLT_PRODUCER_SERVICE( getProducer() ) );
 316                         mlt_properties properties = MLT_FRAME_PROPERTIES( frame );
 317                         mlt_properties_set_int( properties, "progressive", profile->progressive );
 318                         mlt_properties_set_int( properties, "meta.media.progressive", profile->progressive );
 319                         mlt_properties_set_int( properties, "top_field_first", m_topFieldFirst );
 320                         mlt_properties_set_double( properties, "aspect_ratio", mlt_profile_sar( profile ) );
 321                         mlt_properties_set_int( properties, "meta.media.sample_aspect_num", profile->sample_aspect_num );
 322                         mlt_properties_set_int( properties, "meta.media.sample_aspect_den", profile->sample_aspect_den );
 323                         mlt_properties_set_int( properties, "meta.media.frame_rate_num", profile->frame_rate_num );
 324                         mlt_properties_set_int( properties, "meta.media.frame_rate_den", profile->frame_rate_den );
 325                         mlt_properties_set_int( properties, "width", profile->width );
 326                         mlt_properties_set_int( properties, "real_width", profile->width );
 327                         mlt_properties_set_int( properties, "meta.media.width", profile->width );
 328                         mlt_properties_set_int( properties, "height", profile->height );
 329                         mlt_properties_set_int( properties, "real_height", profile->height );
 330                         mlt_properties_set_int( properties, "meta.media.height", profile->height );
 331                         mlt_properties_set_int( properties, "format", mlt_image_yuv422 );
 332                         mlt_properties_set_int( properties, "colorspace", m_colorspace );
 333                         mlt_properties_set_int( properties, "meta.media.colorspace", m_colorspace );
 334                         mlt_properties_set_int( properties, "audio_frequency", 48000 );
 335                         mlt_properties_set_int( properties, "audio_channels",
 336                                 mlt_properties_get_int( MLT_PRODUCER_PROPERTIES( getProducer() ), "channels" ) );
 337                 }
 338                 else
 339                         mlt_log_warning( getProducer(), "buffer underrun\n" );
 340
 341                 return frame;
 342         }
 343
 344         // *** DeckLink API implementation of IDeckLinkInputCallback *** //
 345
 346         // IUnknown needs only a dummy implementation
 347         virtual HRESULT STDMETHODCALLTYPE QueryInterface( REFIID iid, LPVOID *ppv )
 348                 { return E_NOINTERFACE; }
 349         virtual ULONG STDMETHODCALLTYPE AddRef()
 350                 { return 1; }
 351         virtual ULONG STDMETHODCALLTYPE Release()
 352                 { return 1; }
 353
 354         /************************* DeckLink API Delegate Methods *****************************/
 355
 356         virtual HRESULT STDMETHODCALLTYPE VideoInputFrameArrived(
 357                         IDeckLinkVideoInputFrame* video,
 358                         IDeckLinkAudioInputPacket* audio )
 359         {
 360                 if ( mlt_properties_get_int( MLT_PRODUCER_PROPERTIES( getProducer() ), "preview" ) &&
 361                         mlt_producer_get_speed( getProducer() ) == 0.0 && !mlt_deque_count( m_queue ))
 362                 {
 363                         pthread_cond_broadcast( &m_condition );
 364                         return S_OK;
 365                 }
 366
 367                 // Create mlt_frame
 368                 mlt_frame frame = mlt_frame_init( MLT_PRODUCER_SERVICE( getProducer() ) );
 369
 370                 // Copy video
 371                 if ( video )
 372                 {
 373                         if ( !( video->GetFlags() & bmdFrameHasNoInputSource ) )
 374                         {
 375                                 int size = video->GetRowBytes() * ( video->GetHeight() + m_vancLines );
 376                                 void* image = mlt_pool_alloc( size );
 377                                 void* buffer = 0;
 378                                 unsigned char* p = (unsigned char*) image;
 379                                 int n = size / 2;
 380 \
 381                                 // Initialize VANC lines to nominal black
 382                                 while ( --n )
 383                                 {
 384                                         *p ++ = 16;
 385                                         *p ++ = 128;
 386                                 }
 387
 388                                 // Capture VANC
 389                                 if ( m_vancLines > 0 )
 390                                 {
 391                                         IDeckLinkVideoFrameAncillary* vanc = 0;
 392                                         if ( video->GetAncillaryData( &vanc ) == S_OK && vanc )
 393                                         {
 394                                                 for ( int i = 1; i < m_vancLines + 1; i++ )
 395                                                 {
 396                                                         if ( vanc->GetBufferForVerticalBlankingLine( i, &buffer ) == S_OK )
 397                                                                 swab( (char*) buffer, (char*) image + ( i - 1 ) * video->GetRowBytes(), video->GetRowBytes() );
 398                                                         else
 399                                                                 mlt_log_debug( getProducer(), "failed capture vanc line %d\n", i );
 400                                                 }
 401                                                 vanc->Release();
 402                                         }
 403                                 }
 404
 405                                 // Capture image
 406                                 video->GetBytes( &buffer );
 407                                 if ( image && buffer )
 408                                 {
 409                                         size =  video->GetRowBytes() * video->GetHeight();
 410                                         swab( (char*) buffer, (char*) image + m_vancLines * video->GetRowBytes(), size );
 411                                         mlt_frame_set_image( frame, (uint8_t*) image, size, mlt_pool_release );
 412                                 }
 413                                 else if ( image )
 414                                 {
 415                                         mlt_log_verbose( getProducer(), "no video\n" );
 416                                         mlt_pool_release( image );
 417                                 }
 418                         }
 419                         else
 420                         {
 421                                 mlt_log_verbose( getProducer(), "no signal\n" );
 422                                 mlt_frame_close( frame );
 423                                 frame = 0;
 424                         }
 425
 426                         // Get timecode
 427                         IDeckLinkTimecode* timecode = 0;
 428                         if ( video->GetTimecode( bmdTimecodeVITC, &timecode ) == S_OK && timecode )
 429                         {
 430                                 const char* timecodeString = 0;
 431
 432 #ifdef WIN32
 433                                 if ( timecode->GetString( (BSTR*) &timecodeString ) == S_OK )
 434 #else
 435                                 if ( timecode->GetString( &timecodeString ) == S_OK )
 436 #endif
 437                                 {
 438                                         mlt_properties_set( MLT_FRAME_PROPERTIES( frame ), "meta.attr.vitc.markup", timecodeString );
 439                                         mlt_log_debug( getProducer(), "timecode %s\n", timecodeString );
 440                                 }
 441                                 if ( timecodeString )
 442                                         free( (void*) timecodeString );
 443                                 timecode->Release();
 444                         }
 445                 }
 446                 else
 447                 {
 448                         mlt_log_verbose( getProducer(), "no video\n" );
 449                         mlt_frame_close( frame );
 450                         frame = 0;
 451                 }
 452
 453                 // Copy audio
 454                 if ( frame && audio )
 455                 {
 456                         int channels = mlt_properties_get_int( MLT_PRODUCER_PROPERTIES( getProducer() ), "channels" );
 457                         int size = audio->GetSampleFrameCount() * channels * sizeof(int16_t);
 458                         mlt_audio_format format = mlt_audio_s16;
 459                         void* pcm = mlt_pool_alloc( size );
 460                         void* buffer = 0;
 461
 462                         audio->GetBytes( &buffer );
 463                         if ( buffer )
 464                         {
 465                                 memcpy( pcm, buffer, size );
 466                                 mlt_frame_set_audio( frame, pcm, format, size, mlt_pool_release );
 467                                 mlt_properties_set_int( MLT_FRAME_PROPERTIES(frame), "audio_samples", audio->GetSampleFrameCount() );
 468                         }
 469                         else
 470                         {
 471                                 mlt_log_verbose( getProducer(), "no audio\n" );
 472                                 mlt_pool_release( pcm );
 473                         }
 474                 }
 475                 else
 476                 {
 477                         mlt_log_verbose( getProducer(), "no audio\n" );
 478                 }
 479
 480                 // Put frame in queue
 481                 if ( frame )
 482                 {
 483                         int queueMax = mlt_properties_get_int( MLT_PRODUCER_PROPERTIES( getProducer() ), "buffer" );
 484                         pthread_mutex_lock( &m_mutex );
 485                         if ( mlt_deque_count( m_queue ) < queueMax )
 486                         {
 487                                 mlt_deque_push_back( m_queue, frame );
 488                                 pthread_cond_broadcast( &m_condition );
 489                         }
 490                         else
 491                         {
 492                                 mlt_frame_close( frame );
 493                                 mlt_properties_set_int( MLT_PRODUCER_PROPERTIES( getProducer() ), "dropped", ++m_dropped );
 494                                 mlt_log_warning( getProducer(), "frame dropped %d\n", m_dropped );
 495                         }
 496                         pthread_mutex_unlock( &m_mutex );
 497                 }
 498
 499                 return S_OK;
 500         }
 501
 502         virtual HRESULT STDMETHODCALLTYPE VideoInputFormatChanged(
 503                         BMDVideoInputFormatChangedEvents events,
 504                         IDeckLinkDisplayMode* mode,
 505                         BMDDetectedVideoInputFormatFlags flags )
 506         {
 507                 mlt_profile profile = mlt_service_profile( MLT_PRODUCER_SERVICE( getProducer() ) );
 508                 if ( events & bmdVideoInputDisplayModeChanged )
 509                 {
 510                         BMDTimeValue duration;
 511                         BMDTimeScale timescale;
 512                         mode->GetFrameRate( &duration, &timescale );
 513                         profile->width = mode->GetWidth();
 514                         profile->height = mode->GetHeight() + m_vancLines;
 515                         profile->frame_rate_num = timescale;
 516                         profile->frame_rate_den = duration;
 517                         if ( profile->width == 720 )
 518                         {
 519                                 if ( profile->height == 576 )
 520                                 {
 521                                         profile->sample_aspect_num = 16;
 522                                         profile->sample_aspect_den = 15;
 523                                 }
 524                                 else
 525                                 {
 526                                         profile->sample_aspect_num = 8;
 527                                         profile->sample_aspect_den = 9;
 528                                 }
 529                                 profile->display_aspect_num = 4;
 530                                 profile->display_aspect_den = 3;
 531                         }
 532                         else
 533                         {
 534                                 profile->sample_aspect_num = 1;
 535                                 profile->sample_aspect_den = 1;
 536                                 profile->display_aspect_num = 16;
 537                                 profile->display_aspect_den = 9;
 538                         }
 539                         free( profile->description );
 540                         profile->description = strdup( "decklink" );
 541                         mlt_log_verbose( getProducer(), "format changed %dx%d %.3f fps\n",
 542                                 profile->width, profile->height, (double) profile->frame_rate_num / profile->frame_rate_den );
 543                 }
 544                 if ( events & bmdVideoInputFieldDominanceChanged )
 545                 {
 546                         profile->progressive = mode->GetFieldDominance() == bmdProgressiveFrame;
 547                         m_topFieldFirst = mode->GetFieldDominance() == bmdUpperFieldFirst;
 548                         mlt_log_verbose( getProducer(), "field dominance changed prog %d tff %d\n",
 549                                 profile->progressive, m_topFieldFirst );
 550                 }
 551                 if ( events & bmdVideoInputColorspaceChanged )
 552                 {
 553                         profile->colorspace = m_colorspace =
 554                                 ( mode->GetFlags() & bmdDisplayModeColorspaceRec709 ) ? 709 : 601;
 555                         mlt_log_verbose( getProducer(), "colorspace changed %d\n", profile->colorspace );
 556                 }
 557                 return S_OK;
 558         }
 559 };
 560
 561 static int get_audio( mlt_frame frame, int16_t **buffer, mlt_audio_format *format, int *frequency, int *channels, int *samples )
 562 {
 563         return mlt_frame_get_audio( frame, (void**) buffer, format, frequency, channels, samples );
 564 }
 565
 566 static int get_image( mlt_frame frame, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
 567 {
 568         return mlt_frame_get_image( frame, buffer, format, width, height, writable );
 569 }
 570
 571 static int get_frame( mlt_producer producer, mlt_frame_ptr frame, int index )
 572 {
 573         DeckLinkProducer* decklink = (DeckLinkProducer*) producer->child;
 574         mlt_position pos = mlt_producer_position( producer );
 575         mlt_position end = mlt_producer_get_playtime( producer );
 576         end = ( mlt_producer_get_length( producer ) < end ? mlt_producer_get_length( producer ) : end ) - 1;
 577
 578         // Re-open if needed
 579         if ( !decklink && pos < end )
 580         {
 581                 producer->child = decklink = new DeckLinkProducer();
 582                 decklink->setProducer( producer );
 583                 decklink->open( mlt_properties_get_int( MLT_PRODUCER_PROPERTIES(producer), "resource" ) );
 584         }
 585
 586         // Start if needed
 587         if ( decklink )
 588         {
 589                 decklink->start( mlt_service_profile( MLT_PRODUCER_SERVICE( producer ) ) );
 590
 591                 // Get the next frame from the decklink object
 592                 if ( ( *frame = decklink->getFrame() ))
 593                 {
 594                         // Add audio and video getters
 595                         mlt_frame_push_audio( *frame, (void*) get_audio );
 596                         mlt_frame_push_get_image( *frame, get_image );
 597                 }
 598         }
 599         if ( !*frame )
 600                 *frame = mlt_frame_init( MLT_PRODUCER_SERVICE(producer) );
 601
 602         // Calculate the next timecode
 603         mlt_frame_set_position( *frame, mlt_producer_position( producer ) );
 604         mlt_producer_prepare_next( producer );
 605
 606         // Close DeckLink if at end
 607         if ( pos >= end && decklink )
 608         {
 609                 decklink->stop();
 610                 delete decklink;
 611                 producer->child = NULL;
 612         }
 613
 614         return 0;
 615 }
 616
 617 static void producer_close( mlt_producer producer )
 618 {
 619         delete (DeckLinkProducer*) producer->child;
 620         producer->close = NULL;
 621         mlt_producer_close( producer );
 622 }
 623
 624 extern "C" {
 625
 626 /** Initialise the producer.
 627  */
 628
 629 mlt_producer producer_decklink_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg )
 630 {
 631         // Allocate the producer
 632         DeckLinkProducer* decklink = new DeckLinkProducer();
 633         mlt_producer producer = (mlt_producer) calloc( 1, sizeof( *producer ) );
 634
 635         // If allocated and initializes
 636         if ( decklink && !mlt_producer_init( producer, decklink ) )
 637         {
 638                 if ( decklink->open( arg? atoi( arg ) : 0 ) )
 639                 {
 640                         mlt_properties properties = MLT_PRODUCER_PROPERTIES( producer );
 641
 642                         // Close DeckLink and defer re-open to get_frame
 643                         delete decklink;
 644                         producer->child = NULL;
 645
 646                         // Set callbacks
 647                         producer->close = (mlt_destructor) producer_close;
 648                         producer->get_frame = get_frame;
 649
 650                         // Set properties
 651                         mlt_properties_set( properties, "resource", (arg && strcmp( arg, ""))? arg : "0" );
 652                         mlt_properties_set_int( properties, "channels", 2 );
 653                         mlt_properties_set_int( properties, "buffer", 25 );
 654                         mlt_properties_set_int( properties, "prefill", 25 );
 655
 656                         // These properties effectively make it infinite.
 657                         mlt_properties_set_int( properties, "length", INT_MAX );
 658                         mlt_properties_set_int( properties, "out", INT_MAX - 1 );
 659                         mlt_properties_set( properties, "eof", "loop" );
 660                 }
 661         }
 662
 663         return producer;
 664 }
 665
 666 }