2 * producer_decklink.c -- input from Blackmagic Design DeckLink
3 * Copyright (C) 2011 Dan Dennedy <dan@dennedy.org>
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.
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.
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
20 #include <framework/mlt.h>
25 #include "DeckLinkAPI.h"
27 class DeckLinkProducer
28 : public IDeckLinkInputCallback
31 mlt_producer_s m_producer;
32 IDeckLink* m_decklink;
33 IDeckLinkInput* m_decklinkInput;
35 pthread_mutex_t m_mutex;
36 pthread_cond_t m_condition;
40 BMDDisplayMode getDisplayMode( mlt_profile profile )
42 IDeckLinkDisplayModeIterator* iter;
43 IDeckLinkDisplayMode* mode;
44 BMDDisplayMode result = bmdDisplayModeNotSupported;
46 if ( m_decklinkInput->GetDisplayModeIterator( &iter ) == S_OK )
48 while ( !result && iter->Next( &mode ) == S_OK )
50 int width = mode->GetWidth();
51 int height = mode->GetHeight();
52 BMDTimeValue duration;
53 BMDTimeScale timescale;
54 mode->GetFrameRate( &duration, ×cale );
55 double fps = (double) timescale / duration;
56 int p = mode->GetFieldDominance() == bmdProgressiveFrame;
57 mlt_log_verbose( getProducer(), "BMD mode %dx%d %.3f fps prog %d\n", width, height, fps, p );
59 if ( width == profile->width && height == profile->height && p == profile->progressive
60 && fps == mlt_profile_fps( profile ) )
61 result = mode->GetDisplayMode();
70 mlt_producer getProducer()
71 { return &m_producer; }
75 if ( m_decklinkInput )
76 m_decklinkInput->Release();
78 m_decklink->Release();
82 mlt_deque_close( m_queue );
83 pthread_mutex_destroy( &m_mutex );
84 pthread_cond_destroy( &m_condition );
88 bool open( mlt_profile profile, unsigned card = 0 )
90 IDeckLinkIterator* decklinkIterator = CreateDeckLinkIteratorInstance();
93 if ( !decklinkIterator )
94 throw "The DeckLink drivers are not installed.";
96 // Connect to the Nth DeckLink instance
99 if ( decklinkIterator->Next( &m_decklink ) != S_OK )
100 throw "DeckLink card not found.";
101 } while ( ++i <= card );
102 decklinkIterator->Release();
104 // Get the input interface
105 if ( m_decklink->QueryInterface( IID_IDeckLinkInput, (void**) &m_decklinkInput ) != S_OK )
106 throw "No DeckLink cards support input.";
108 // Provide this class as a delegate to the input callback
109 m_decklinkInput->SetCallback( this );
111 // Initialize other members
112 pthread_mutex_init( &m_mutex, NULL );
113 pthread_cond_init( &m_condition, NULL );
114 m_queue = mlt_deque_init();
118 catch ( const char *error )
120 if ( decklinkIterator )
121 decklinkIterator->Release();
122 mlt_log_error( getProducer(), "%s\n", error );
128 bool start( mlt_profile profile = 0 )
135 profile = mlt_service_profile( MLT_PRODUCER_SERVICE( getProducer() ) );
137 // Get the display mode
138 BMDDisplayMode displayMode = getDisplayMode( profile );
139 if ( displayMode == bmdDisplayModeNotSupported )
140 throw "Profile is not compatible with decklink.";
142 // Enable video capture
143 BMDPixelFormat pixelFormat = bmdFormat8BitYUV;
144 BMDVideoInputFlags flags = bmdVideoInputFlagDefault;
145 if ( S_OK != m_decklinkInput->EnableVideoInput( displayMode, pixelFormat, flags ) )
146 throw "Failed to enable video capture.";
148 // Enable audio capture
149 BMDAudioSampleRate sampleRate = bmdAudioSampleRate48kHz;
150 BMDAudioSampleType sampleType = bmdAudioSampleType16bitInteger;
151 int channels = mlt_properties_get_int( MLT_PRODUCER_PROPERTIES( getProducer() ), "channels" );
152 if ( S_OK != m_decklinkInput->EnableAudioInput( sampleRate, sampleType, channels ) )
153 throw "Failed to enable audio capture.";
157 mlt_properties_set_int( MLT_PRODUCER_PROPERTIES( getProducer() ), "dropped", m_dropped );
158 m_started = m_decklinkInput->StartStreams() == S_OK;
160 throw "Failed to start capture.";
162 catch ( const char *error )
164 m_decklinkInput->DisableVideoInput();
165 mlt_log_error( getProducer(), "%s\n", error );
176 // Release the wait in getFrame
177 pthread_mutex_lock( &m_mutex );
178 pthread_cond_broadcast( &m_condition );
179 pthread_mutex_unlock( &m_mutex );
181 m_decklinkInput->StopStreams();
184 pthread_mutex_lock( &m_mutex );
185 while ( mlt_frame frame = (mlt_frame) mlt_deque_pop_back( m_queue ) )
186 mlt_frame_close( frame );
187 pthread_mutex_unlock( &m_mutex );
194 mlt_frame frame = NULL;
196 // Wait if queue is empty
197 pthread_mutex_lock( &m_mutex );
198 while ( mlt_deque_count( m_queue ) < 1 )
199 pthread_cond_wait( &m_condition, &m_mutex );
201 // Get the first frame from the queue
202 frame = ( mlt_frame ) mlt_deque_pop_front( m_queue );
203 pthread_mutex_unlock( &m_mutex );
205 // Set frame timestamp and properties
206 mlt_profile profile = mlt_service_profile( MLT_PRODUCER_SERVICE( getProducer() ) );
207 mlt_properties properties = MLT_FRAME_PROPERTIES( frame );
208 mlt_properties_set_int( properties, "progressive", profile->progressive );
209 mlt_properties_set_double( properties, "aspect_ratio", mlt_profile_sar( profile ) );
210 mlt_properties_set_int( properties, "width", profile->width );
211 mlt_properties_set_int( properties, "real_width", profile->width );
212 mlt_properties_set_int( properties, "height", profile->height );
213 mlt_properties_set_int( properties, "real_height", profile->height );
214 mlt_properties_set_int( properties, "format", mlt_image_yuv422 );
215 mlt_properties_set_int( properties, "audio_frequency", 48000 );
216 mlt_properties_set_int( properties, "audio_channels",
217 mlt_properties_get_int( MLT_PRODUCER_PROPERTIES( getProducer() ), "channels" ) );
222 // *** DeckLink API implementation of IDeckLinkInputCallback *** //
224 // IUnknown needs only a dummy implementation
225 virtual HRESULT STDMETHODCALLTYPE QueryInterface( REFIID iid, LPVOID *ppv )
226 { return E_NOINTERFACE; }
227 virtual ULONG STDMETHODCALLTYPE AddRef()
229 virtual ULONG STDMETHODCALLTYPE Release()
232 /************************* DeckLink API Delegate Methods *****************************/
234 virtual HRESULT STDMETHODCALLTYPE VideoInputFrameArrived(
235 IDeckLinkVideoInputFrame* video,
236 IDeckLinkAudioInputPacket* audio )
239 mlt_frame frame = mlt_frame_init( MLT_PRODUCER_SERVICE( getProducer() ) );
244 if ( !( video->GetFlags() & bmdFrameHasNoInputSource ) )
246 int size = video->GetRowBytes() * video->GetHeight();
247 void* image = mlt_pool_alloc( size );
250 video->GetBytes( &buffer );
251 if ( image && buffer )
253 swab( buffer, image, size );
254 mlt_frame_set_image( frame, (uint8_t*) image, size, mlt_pool_release );
258 mlt_log_verbose( getProducer(), "no video\n" );
259 mlt_pool_release( image );
264 mlt_log_verbose( getProducer(), "no signal\n" );
265 mlt_frame_close( frame );
271 mlt_log_verbose( getProducer(), "no video\n" );
272 mlt_frame_close( frame );
277 if ( frame && audio )
279 int channels = mlt_properties_get_int( MLT_PRODUCER_PROPERTIES( getProducer() ), "channels" );
280 int size = audio->GetSampleFrameCount() * channels * sizeof(int16_t);
281 mlt_audio_format format = mlt_audio_s16;
282 void* pcm = mlt_pool_alloc( size );
285 audio->GetBytes( &buffer );
288 memcpy( pcm, buffer, size );
289 mlt_frame_set_audio( frame, pcm, format, size, mlt_pool_release );
290 mlt_properties_set_int( MLT_FRAME_PROPERTIES(frame), "audio_samples", audio->GetSampleFrameCount() );
294 mlt_log_verbose( getProducer(), "no audio\n" );
295 mlt_pool_release( pcm );
300 mlt_log_verbose( getProducer(), "no audio\n" );
303 // Put frame in queue
306 int queueMax = mlt_properties_get_int( MLT_PRODUCER_PROPERTIES( getProducer() ), "buffer" );
307 pthread_mutex_lock( &m_mutex );
308 if ( mlt_deque_count( m_queue ) < queueMax )
310 mlt_deque_push_back( m_queue, frame );
311 pthread_cond_broadcast( &m_condition );
315 mlt_frame_close( frame );
316 mlt_properties_set_int( MLT_PRODUCER_PROPERTIES( getProducer() ), "dropped", ++m_dropped );
317 mlt_log_warning( getProducer(), "frame dropped %d\n", m_dropped );
319 pthread_mutex_unlock( &m_mutex );
325 virtual HRESULT STDMETHODCALLTYPE VideoInputFormatChanged(
326 BMDVideoInputFormatChangedEvents events,
327 IDeckLinkDisplayMode* mode,
328 BMDDetectedVideoInputFormatFlags flags )
334 static int get_audio( mlt_frame frame, int16_t **buffer, mlt_audio_format *format, int *frequency, int *channels, int *samples )
336 return mlt_frame_get_audio( frame, (void**) buffer, format, frequency, channels, samples );
339 static int get_image( mlt_frame frame, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
341 return mlt_frame_get_image( frame, buffer, format, width, height, writable );
344 static int get_frame( mlt_producer producer, mlt_frame_ptr frame, int index )
346 DeckLinkProducer* decklink = (DeckLinkProducer*) producer->child;
348 // Get the next frame from the decklink object
349 *frame = decklink->getFrame();
351 // Calculate the next timecode
352 mlt_frame_set_position( *frame, mlt_producer_position( producer ) );
353 mlt_producer_prepare_next( producer );
355 // Add audio and video getters
356 mlt_frame_push_audio( *frame, (void*) get_audio );
357 mlt_frame_push_get_image( *frame, get_image );
362 static void producer_close( mlt_producer producer )
364 producer->close = NULL;
365 mlt_producer_close( producer );
366 delete (DeckLinkProducer*) producer->child;
371 /** Initialise the producer.
374 mlt_producer producer_decklink_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg )
376 // Allocate the producer
377 DeckLinkProducer* decklink = new DeckLinkProducer();
378 mlt_producer producer = NULL;
380 // If allocated and initializes
381 if ( decklink && !mlt_producer_init( decklink->getProducer(), decklink ) )
383 if ( decklink->open( profile, arg? atoi( arg ) : 0 ) )
385 producer = decklink->getProducer();
388 producer->close = (mlt_destructor) producer_close;
389 producer->get_frame = get_frame;
392 mlt_properties_set( MLT_PRODUCER_PROPERTIES( producer ), "resource", arg );
393 mlt_properties_set_int( MLT_PRODUCER_PROPERTIES( producer ), "channels", 2 );
394 mlt_properties_set_int( MLT_PRODUCER_PROPERTIES( producer ), "buffer", 25 );
397 if ( !decklink->start( profile ) )
399 producer_close( producer );