bool open( unsigned card = 0 )
{
IDeckLinkIterator* decklinkIterator = NULL;
try
{
#ifdef WIN32
HRESULT result = CoInitialize( NULL );
if ( FAILED( result ) )
throw "COM initialization failed";
result = CoCreateInstance( CLSID_CDeckLinkIterator, NULL, CLSCTX_ALL, IID_IDeckLinkIterator, (void**) &decklinkIterator );
if ( FAILED( result ) )
throw "The DeckLink drivers are not installed.";
#else
decklinkIterator = CreateDeckLinkIteratorInstance();
if ( !decklinkIterator )
throw "The DeckLink drivers are not installed.";
#endif
// Connect to the Nth DeckLink instance
for ( unsigned i = 0; decklinkIterator->Next( &m_decklink ) == S_OK ; i++)
{
if ( i == card )
break;
else
SAFE_RELEASE( m_decklink );
}
SAFE_RELEASE( decklinkIterator );
if ( !m_decklink )
throw "DeckLink card not found.";
// Get the input interface
if ( m_decklink->QueryInterface( IID_IDeckLinkInput, (void**) &m_decklinkInput ) != S_OK )
throw "No DeckLink cards support input.";
// Provide this class as a delegate to the input callback
m_decklinkInput->SetCallback( this );
// Initialize other members
pthread_mutex_init( &m_mutex, NULL );
pthread_cond_init( &m_condition, NULL );
m_queue = mlt_deque_init();
m_started = false;
m_dropped = 0;
m_isBuffering = true;
m_cache = mlt_cache_init();
// 3 covers YADIF and increasing framerate use cases
mlt_cache_set_size( m_cache, 3 );
}
catch ( const char *error )
{
SAFE_RELEASE( m_decklinkInput );
SAFE_RELEASE( m_decklink );
mlt_log_error( getProducer(), "%s\n", error );
return false;
}
return true;
}
void mlt_service_cache_set_size( mlt_service self, const char *name, int size )
{
mlt_cache cache = get_cache( self, name );
if ( cache )
mlt_cache_set_size( cache, size );
}