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