/** * \file mlt_consumer.c * \brief abstraction for all consumer services * \see mlt_consumer_s * * Copyright (C) 2003-2009 Ushodaya Enterprises Limited * \author Charles Yates * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include "mlt_consumer.h" #include "mlt_factory.h" #include "mlt_producer.h" #include "mlt_frame.h" #include "mlt_profile.h" #include "mlt_log.h" #include #include #include #include /** Define this if you want an automatic deinterlace (if necessary) when the * consumer's producer is not running at normal speed. */ #undef DEINTERLACE_ON_NOT_NORMAL_SPEED static void mlt_consumer_frame_render( mlt_listener listener, mlt_properties owner, mlt_service this, void **args ); static void mlt_consumer_frame_show( mlt_listener listener, mlt_properties owner, mlt_service this, void **args ); static void mlt_consumer_property_changed( mlt_service owner, mlt_consumer this, char *name ); static void apply_profile_properties( mlt_consumer this, mlt_profile profile, mlt_properties properties ); /** Initialize a consumer service. * * \public \memberof mlt_consumer_s * \param this the consumer to initialize * \param child a pointer to the object for the subclass * \param profile the \p mlt_profile_s to use (optional but recommended, * uses the environment variable MLT if this is NULL) * \return true if there was an error */ int mlt_consumer_init( mlt_consumer this, void *child, mlt_profile profile ) { int error = 0; memset( this, 0, sizeof( struct mlt_consumer_s ) ); this->child = child; error = mlt_service_init( &this->parent, this ); if ( error == 0 ) { // Get the properties from the service mlt_properties properties = MLT_SERVICE_PROPERTIES( &this->parent ); // Apply profile to properties if ( profile == NULL ) { // Normally the application creates the profile and controls its lifetime // This is the fallback exception handling profile = mlt_profile_init( NULL ); mlt_properties properties = MLT_CONSUMER_PROPERTIES( this ); mlt_properties_set_data( properties, "_profile", profile, 0, (mlt_destructor)mlt_profile_close, NULL ); } apply_profile_properties( this, profile, properties ); // Default rescaler for all consumers mlt_properties_set( properties, "rescale", "bilinear" ); // Default read ahead buffer size mlt_properties_set_int( properties, "buffer", 25 ); // Default audio frequency and channels mlt_properties_set_int( properties, "frequency", 48000 ); mlt_properties_set_int( properties, "channels", 2 ); // Default of all consumers is real time mlt_properties_set_int( properties, "real_time", 1 ); // Default to environment test card mlt_properties_set( properties, "test_card", mlt_environment( "MLT_TEST_CARD" ) ); // Hmm - default all consumers to yuv422 :-/ this->format = mlt_image_yuv422; mlt_events_register( properties, "consumer-frame-show", ( mlt_transmitter )mlt_consumer_frame_show ); mlt_events_register( properties, "consumer-frame-render", ( mlt_transmitter )mlt_consumer_frame_render ); mlt_events_register( properties, "consumer-stopped", NULL ); // Register a property-changed listener to handle the profile property - // subsequent properties can override the profile this->event_listener = mlt_events_listen( properties, this, "property-changed", ( mlt_listener )mlt_consumer_property_changed ); // Create the push mutex and condition pthread_mutex_init( &this->put_mutex, NULL ); pthread_cond_init( &this->put_cond, NULL ); } return error; } /** Convert the profile into properties on the consumer. * * \private \memberof mlt_consumer_s * \param this a consumer * \param profile a profile * \param properties a properties list (typically, the consumer's) */ static void apply_profile_properties( mlt_consumer this, mlt_profile profile, mlt_properties properties ) { mlt_event_block( this->event_listener ); mlt_properties_set_double( properties, "fps", mlt_profile_fps( profile ) ); mlt_properties_set_int( properties, "frame_rate_num", profile->frame_rate_num ); mlt_properties_set_int( properties, "frame_rate_den", profile->frame_rate_den ); mlt_properties_set_int( properties, "width", profile->width ); mlt_properties_set_int( properties, "height", profile->height ); mlt_properties_set_int( properties, "progressive", profile->progressive ); mlt_properties_set_double( properties, "aspect_ratio", mlt_profile_sar( profile ) ); mlt_properties_set_int( properties, "sample_aspect_num", profile->sample_aspect_num ); mlt_properties_set_int( properties, "sample_aspect_den", profile->sample_aspect_den ); mlt_properties_set_double( properties, "display_ratio", mlt_profile_dar( profile ) ); mlt_properties_set_int( properties, "display_aspect_num", profile->display_aspect_num ); mlt_properties_set_int( properties, "display_aspect_num", profile->display_aspect_num ); mlt_event_unblock( this->event_listener ); } /** The property-changed event listener * * \private \memberof mlt_consumer_s * \param owner the service a service (ignored) * \param this the consumer * \param name the name of the property that changed */ static void mlt_consumer_property_changed( mlt_service owner, mlt_consumer this, char *name ) { if ( !strcmp( name, "profile" ) ) { // Get the properies mlt_properties properties = MLT_CONSUMER_PROPERTIES( this ); // Get the current profile mlt_profile profile = mlt_service_profile( MLT_CONSUMER_SERVICE( this ) ); // Load the new profile mlt_profile new_profile = mlt_profile_init( mlt_properties_get( properties, name ) ); if ( new_profile ) { // Copy the profile if ( profile != NULL ) { free( profile->description ); memcpy( profile, new_profile, sizeof( struct mlt_profile_s ) ); profile->description = strdup( new_profile->description ); mlt_profile_close( new_profile ); } else { profile = new_profile; } // Apply to properties apply_profile_properties( this, profile, properties ); } } else if ( !strcmp( name, "frame_rate_num" ) ) { mlt_properties properties = MLT_CONSUMER_PROPERTIES( this ); mlt_profile profile = mlt_service_profile( MLT_CONSUMER_SERVICE( this ) ); if ( profile ) { profile->frame_rate_num = mlt_properties_get_int( properties, "frame_rate_num" ); mlt_properties_set_double( properties, "fps", mlt_profile_fps( profile ) ); } } else if ( !strcmp( name, "frame_rate_den" ) ) { mlt_properties properties = MLT_CONSUMER_PROPERTIES( this ); mlt_profile profile = mlt_service_profile( MLT_CONSUMER_SERVICE( this ) ); if ( profile ) { profile->frame_rate_den = mlt_properties_get_int( properties, "frame_rate_den" ); mlt_properties_set_double( properties, "fps", mlt_profile_fps( profile ) ); } } else if ( !strcmp( name, "width" ) ) { mlt_properties properties = MLT_CONSUMER_PROPERTIES( this ); mlt_profile profile = mlt_service_profile( MLT_CONSUMER_SERVICE( this ) ); if ( profile ) profile->width = mlt_properties_get_int( properties, "width" ); } else if ( !strcmp( name, "height" ) ) { mlt_properties properties = MLT_CONSUMER_PROPERTIES( this ); mlt_profile profile = mlt_service_profile( MLT_CONSUMER_SERVICE( this ) ); if ( profile ) profile->height = mlt_properties_get_int( properties, "height" ); } else if ( !strcmp( name, "progressive" ) ) { mlt_properties properties = MLT_CONSUMER_PROPERTIES( this ); mlt_profile profile = mlt_service_profile( MLT_CONSUMER_SERVICE( this ) ); if ( profile ) profile->progressive = mlt_properties_get_int( properties, "progressive" ); } else if ( !strcmp( name, "sample_aspect_num" ) ) { mlt_properties properties = MLT_CONSUMER_PROPERTIES( this ); mlt_profile profile = mlt_service_profile( MLT_CONSUMER_SERVICE( this ) ); profile->sample_aspect_num = mlt_properties_get_int( properties, "sample_aspect_num" ); if ( profile ) mlt_properties_set_double( properties, "aspect_ratio", mlt_profile_sar( profile ) ); } else if ( !strcmp( name, "sample_aspect_den" ) ) { mlt_properties properties = MLT_CONSUMER_PROPERTIES( this ); mlt_profile profile = mlt_service_profile( MLT_CONSUMER_SERVICE( this ) ); profile->sample_aspect_den = mlt_properties_get_int( properties, "sample_aspect_den" ); if ( profile ) mlt_properties_set_double( properties, "aspect_ratio", mlt_profile_sar( profile ) ); } else if ( !strcmp( name, "display_aspect_num" ) ) { mlt_properties properties = MLT_CONSUMER_PROPERTIES( this ); mlt_profile profile = mlt_service_profile( MLT_CONSUMER_SERVICE( this ) ); if ( profile ) { profile->display_aspect_num = mlt_properties_get_int( properties, "display_aspect_num" ); mlt_properties_set_double( properties, "display_ratio", mlt_profile_dar( profile ) ); } } else if ( !strcmp( name, "display_aspect_den" ) ) { mlt_properties properties = MLT_CONSUMER_PROPERTIES( this ); mlt_profile profile = mlt_service_profile( MLT_CONSUMER_SERVICE( this ) ); if ( profile ) { profile->display_aspect_den = mlt_properties_get_int( properties, "display_aspect_den" ); mlt_properties_set_double( properties, "display_ratio", mlt_profile_dar( profile ) ); } } } /** The transmitter for the consumer-frame-show event * * Invokes the listener. * * \private \memberof mlt_consumer_s * \param listener a function pointer that will be invoked * \param owner a properties list that will be passed to \p listener * \param this a service that will be passed to \p listener * \param args an array of pointers - the first entry is passed as a string to \p listener */ static void mlt_consumer_frame_show( mlt_listener listener, mlt_properties owner, mlt_service this, void **args ) { if ( listener != NULL ) listener( owner, this, ( mlt_frame )args[ 0 ] ); } /** The transmitter for the consumer-frame-render event * * Invokes the listener. * * \private \memberof mlt_consumer_s * \param listener a function pointer that will be invoked * \param owner a properties list that will be passed to \p listener * \param this a service that will be passed to \p listener * \param args an array of pointers - the first entry is passed as a string to \p listener */ static void mlt_consumer_frame_render( mlt_listener listener, mlt_properties owner, mlt_service this, void **args ) { if ( listener != NULL ) listener( owner, this, ( mlt_frame )args[ 0 ] ); } /** Create a new consumer. * * \public \memberof mlt_consumer_s * \param profile a profile (optional, but recommended) * \return a new consumer */ mlt_consumer mlt_consumer_new( mlt_profile profile ) { // Create the memory for the structure mlt_consumer this = malloc( sizeof( struct mlt_consumer_s ) ); // Initialise it if ( this != NULL ) mlt_consumer_init( this, NULL, profile ); // Return it return this; } /** Get the parent service object. * * \public \memberof mlt_consumer_s * \param this a consumer * \return the parent service class * \see MLT_CONSUMER_SERVICE */ mlt_service mlt_consumer_service( mlt_consumer this ) { return this != NULL ? &this->parent : NULL; } /** Get the consumer properties. * * \public \memberof mlt_consumer_s * \param this a consumer * \return the consumer's properties list * \see MLT_CONSUMER_PROPERTIES */ mlt_properties mlt_consumer_properties( mlt_consumer this ) { return this != NULL ? MLT_SERVICE_PROPERTIES( &this->parent ) : NULL; } /** Connect the consumer to the producer. * * \public \memberof mlt_consumer_s * \param this a consumer * \param producer a producer * \return > 0 warning, == 0 success, < 0 serious error, * 1 = this service does not accept input, * 2 = the producer is invalid, * 3 = the producer is already registered with this consumer */ int mlt_consumer_connect( mlt_consumer this, mlt_service producer ) { return mlt_service_connect_producer( &this->parent, producer, 0 ); } /** Start the consumer. * * \public \memberof mlt_consumer_s * \param this a consumer * \return true if there was an error */ int mlt_consumer_start( mlt_consumer this ) { // Stop listening to the property-changed event mlt_event_block( this->event_listener ); // Get the properies mlt_properties properties = MLT_CONSUMER_PROPERTIES( this ); // Determine if there's a test card producer char *test_card = mlt_properties_get( properties, "test_card" ); // Just to make sure nothing is hanging around... mlt_frame_close( this->put ); this->put = NULL; this->put_active = 1; // Deal with it now. if ( test_card != NULL ) { if ( mlt_properties_get_data( properties, "test_card_producer", NULL ) == NULL ) { // Create a test card producer mlt_profile profile = mlt_service_profile( MLT_CONSUMER_SERVICE( this ) ); mlt_producer producer = mlt_factory_producer( profile, NULL, test_card ); // Do we have a producer if ( producer != NULL ) { // Test card should loop I guess... mlt_properties_set( MLT_PRODUCER_PROPERTIES( producer ), "eof", "loop" ); //mlt_producer_set_speed( producer, 0 ); //mlt_producer_set_in_and_out( producer, 0, 0 ); // Set the test card on the consumer mlt_properties_set_data( properties, "test_card_producer", producer, 0, ( mlt_destructor )mlt_producer_close, NULL ); } } } else { // Allow the hash table to speed things up mlt_properties_set_data( properties, "test_card_producer", NULL, 0, NULL, NULL ); } // Set the frame duration in microseconds for the frame-dropping heuristic int frame_duration = 1000000 / mlt_properties_get_int( properties, "frame_rate_num" ) * mlt_properties_get_int( properties, "frame_rate_den" ); mlt_properties_set_int( properties, "frame_duration", frame_duration ); // Check and run an ante command if ( mlt_properties_get( properties, "ante" ) ) if ( system( mlt_properties_get( properties, "ante" ) ) == -1 ) mlt_log( MLT_CONSUMER_SERVICE( this ), MLT_LOG_ERROR, "system(%s) failed!\n", mlt_properties_get( properties, "ante" ) ); // Set the real_time preference this->real_time = mlt_properties_get_int( properties, "real_time" ); // Start the service if ( this->start != NULL ) return this->start( this ); return 0; } /** An alternative method to feed frames into the consumer. * * Only valid if the consumer itself is not connected. * * \public \memberof mlt_consumer_s * \param this a consumer * \param frame a frame * \return true (ignore this for now) */ int mlt_consumer_put_frame( mlt_consumer this, mlt_frame frame ) { int error = 1; // Get the service assoicated to the consumer mlt_service service = MLT_CONSUMER_SERVICE( this ); if ( mlt_service_producer( service ) == NULL ) { struct timeval now; struct timespec tm; pthread_mutex_lock( &this->put_mutex ); while ( this->put_active && this->put != NULL ) { gettimeofday( &now, NULL ); tm.tv_sec = now.tv_sec + 1; tm.tv_nsec = now.tv_usec * 1000; pthread_cond_timedwait( &this->put_cond, &this->put_mutex, &tm ); } if ( this->put_active && this->put == NULL ) this->put = frame; else mlt_frame_close( frame ); pthread_cond_broadcast( &this->put_cond ); pthread_mutex_unlock( &this->put_mutex ); } else { mlt_frame_close( frame ); } return error; } /** Protected method for consumer to get frames from connected service * * \public \memberof mlt_consumer_s * \param this a consumer * \return a frame */ mlt_frame mlt_consumer_get_frame( mlt_consumer this ) { // Frame to return mlt_frame frame = NULL; // Get the service assoicated to the consumer mlt_service service = MLT_CONSUMER_SERVICE( this ); // Get the consumer properties mlt_properties properties = MLT_CONSUMER_PROPERTIES( this ); // Get the frame if ( mlt_service_producer( service ) == NULL && mlt_properties_get_int( properties, "put_mode" ) ) { struct timeval now; struct timespec tm; pthread_mutex_lock( &this->put_mutex ); while ( this->put_active && this->put == NULL ) { gettimeofday( &now, NULL ); tm.tv_sec = now.tv_sec + 1; tm.tv_nsec = now.tv_usec * 1000; pthread_cond_timedwait( &this->put_cond, &this->put_mutex, &tm ); } frame = this->put; this->put = NULL; pthread_cond_broadcast( &this->put_cond ); pthread_mutex_unlock( &this->put_mutex ); if ( frame != NULL ) mlt_service_apply_filters( service, frame, 0 ); } else if ( mlt_service_producer( service ) != NULL ) { mlt_service_get_frame( service, &frame, 0 ); } else { frame = mlt_frame_init( service ); } if ( frame != NULL ) { // Get the frame properties mlt_properties frame_properties = MLT_FRAME_PROPERTIES( frame ); // Get the test card producer mlt_producer test_card = mlt_properties_get_data( properties, "test_card_producer", NULL ); // Attach the test frame producer to it. if ( test_card != NULL ) mlt_properties_set_data( frame_properties, "test_card_producer", test_card, 0, NULL, NULL ); // Attach the rescale property mlt_properties_set( frame_properties, "rescale.interp", mlt_properties_get( properties, "rescale" ) ); // Aspect ratio and other jiggery pokery mlt_properties_set_double( frame_properties, "consumer_aspect_ratio", mlt_properties_get_double( properties, "aspect_ratio" ) ); mlt_properties_set_int( frame_properties, "consumer_deinterlace", mlt_properties_get_int( properties, "progressive" ) | mlt_properties_get_int( properties, "deinterlace" ) ); mlt_properties_set( frame_properties, "deinterlace_method", mlt_properties_get( properties, "deinterlace_method" ) ); } // Return the frame return frame; } /** Compute the time difference between now and a time value. * * \private \memberof mlt_consumer_s * \param time1 a time value to be compared against now * \return the difference in microseconds */ static inline long time_difference( struct timeval *time1 ) { struct timeval time2; time2.tv_sec = time1->tv_sec; time2.tv_usec = time1->tv_usec; gettimeofday( time1, NULL ); return time1->tv_sec * 1000000 + time1->tv_usec - time2.tv_sec * 1000000 - time2.tv_usec; } /** The thread procedure for asynchronously pulling frames through the service * network connected to a consumer. * * \private \memberof mlt_consumer_s * \param arg a consumer */ static void *consumer_read_ahead_thread( void *arg ) { // The argument is the consumer mlt_consumer this = arg; // Get the properties of the consumer mlt_properties properties = MLT_CONSUMER_PROPERTIES( this ); // Get the width and height int width = mlt_properties_get_int( properties, "width" ); int height = mlt_properties_get_int( properties, "height" ); // See if video is turned off int video_off = mlt_properties_get_int( properties, "video_off" ); int preview_off = mlt_properties_get_int( properties, "preview_off" ); int preview_format = mlt_properties_get_int( properties, "preview_format" ); // Get the audio settings mlt_audio_format afmt = mlt_audio_pcm; int counter = 0; double fps = mlt_properties_get_double( properties, "fps" ); int channels = mlt_properties_get_int( properties, "channels" ); int frequency = mlt_properties_get_int( properties, "frequency" ); int samples = 0; int16_t *pcm = NULL; // See if audio is turned off int audio_off = mlt_properties_get_int( properties, "audio_off" ); // Get the maximum size of the buffer int buffer = mlt_properties_get_int( properties, "buffer" ) + 1; // General frame variable mlt_frame frame = NULL; uint8_t *image = NULL; // Time structures struct timeval ante; // Average time for get_frame and get_image int count = 1; int skipped = 0; int64_t time_wait = 0; int64_t time_frame = 0; int64_t time_process = 0; int skip_next = 0; mlt_service lock_object = NULL; if ( preview_off && preview_format != 0 ) this->format = preview_format; // Get the first frame frame = mlt_consumer_get_frame( this ); // Get the lock object lock_object = mlt_properties_get_data( MLT_FRAME_PROPERTIES( frame ), "consumer_lock_service", NULL ); // Lock it if ( lock_object ) mlt_service_lock( lock_object ); // Get the image of the first frame if ( !video_off ) { mlt_events_fire( MLT_CONSUMER_PROPERTIES( this ), "consumer-frame-render", frame, NULL ); mlt_frame_get_image( frame, &image, &this->format, &width, &height, 0 ); } if ( !audio_off ) { samples = mlt_sample_calculator( fps, frequency, counter++ ); mlt_frame_get_audio( frame, &pcm, &afmt, &frequency, &channels, &samples ); } // Unlock the lock object if ( lock_object ) mlt_service_unlock( lock_object ); // Mark as rendered mlt_properties_set_int( MLT_FRAME_PROPERTIES( frame ), "rendered", 1 ); // Get the starting time (can ignore the times above) gettimeofday( &ante, NULL ); // Continue to read ahead while ( this->ahead ) { // Fetch width/height again width = mlt_properties_get_int( properties, "width" ); height = mlt_properties_get_int( properties, "height" ); // Put the current frame into the queue pthread_mutex_lock( &this->mutex ); while( this->ahead && mlt_deque_count( this->queue ) >= buffer ) pthread_cond_wait( &this->cond, &this->mutex ); mlt_deque_push_back( this->queue, frame ); pthread_cond_broadcast( &this->cond ); pthread_mutex_unlock( &this->mutex ); time_wait += time_difference( &ante ); // Get the next frame frame = mlt_consumer_get_frame( this ); time_frame += time_difference( &ante ); // If there's no frame, we're probably stopped... if ( frame == NULL ) continue; // Attempt to fetch the lock object lock_object = mlt_properties_get_data( MLT_FRAME_PROPERTIES( frame ), "consumer_lock_service", NULL ); // Increment the count count ++; // Lock if there's a lock object if ( lock_object ) mlt_service_lock( lock_object ); // All non normal playback frames should be shown if ( mlt_properties_get_int( MLT_FRAME_PROPERTIES( frame ), "_speed" ) != 1 ) { #ifdef DEINTERLACE_ON_NOT_NORMAL_SPEED mlt_properties_set_int( MLT_FRAME_PROPERTIES( frame ), "consumer_deinterlace", 1 ); #endif skipped = 0; time_frame = 0; time_process = 0; time_wait = 0; count = 1; skip_next = 0; } // Get the image if ( !skip_next || this->real_time == -1 ) { // Get the image, mark as rendered and time it if ( !video_off ) { mlt_events_fire( MLT_CONSUMER_PROPERTIES( this ), "consumer-frame-render", frame, NULL ); mlt_frame_get_image( frame, &image, &this->format, &width, &height, 0 ); } mlt_properties_set_int( MLT_FRAME_PROPERTIES( frame ), "rendered", 1 ); } else { // Increment the number of sequentially skipped frames skipped ++; skip_next = 0; // If we've reached an unacceptable level, reset everything if ( skipped > 5 ) { skipped = 0; time_frame = 0; time_process = 0; time_wait = 0; count = 1; } } // Always process audio if ( !audio_off ) { samples = mlt_sample_calculator( fps, frequency, counter++ ); mlt_frame_get_audio( frame, &pcm, &afmt, &frequency, &channels, &samples ); } // Increment the time take for this frame time_process += time_difference( &ante ); // Determine if the next frame should be skipped if ( mlt_deque_count( this->queue ) <= 5 ) { int frame_duration = mlt_properties_get_int( properties, "frame_duration" ); if ( ( ( time_wait + time_frame + time_process ) / count ) > frame_duration ) skip_next = 1; } // Unlock if there's a lock object if ( lock_object ) mlt_service_unlock( lock_object ); } // Remove the last frame mlt_frame_close( frame ); return NULL; } /** Start the read/render thread. * * \private \memberof mlt_consumer_s * \param this a consumer */ static void consumer_read_ahead_start( mlt_consumer this ) { // We're running now this->ahead = 1; // Create the frame queue this->queue = mlt_deque_init( ); // Create the mutex pthread_mutex_init( &this->mutex, NULL ); // Create the condition pthread_cond_init( &this->cond, NULL ); // Create the read ahead if ( mlt_properties_get( MLT_CONSUMER_PROPERTIES( this ), "priority" ) ) { struct sched_param priority; priority.sched_priority = mlt_properties_get_int( MLT_CONSUMER_PROPERTIES( this ), "priority" ); pthread_attr_t thread_attributes; pthread_attr_init( &thread_attributes ); pthread_attr_setschedpolicy( &thread_attributes, SCHED_OTHER ); pthread_attr_setschedparam( &thread_attributes, &priority ); pthread_attr_setinheritsched( &thread_attributes, PTHREAD_EXPLICIT_SCHED ); pthread_attr_setscope( &thread_attributes, PTHREAD_SCOPE_SYSTEM ); if ( pthread_create( &this->ahead_thread, &thread_attributes, consumer_read_ahead_thread, this ) < 0 ) pthread_create( &this->ahead_thread, NULL, consumer_read_ahead_thread, this ); pthread_attr_destroy( &thread_attributes ); } else { pthread_create( &this->ahead_thread, NULL, consumer_read_ahead_thread, this ); } } /** Stop the read/render thread. * * \private \memberof mlt_consumer_s * \param this a consumer */ static void consumer_read_ahead_stop( mlt_consumer this ) { // Make sure we're running if ( this->ahead ) { // Inform thread to stop this->ahead = 0; // Broadcast to the condition in case it's waiting pthread_mutex_lock( &this->mutex ); pthread_cond_broadcast( &this->cond ); pthread_mutex_unlock( &this->mutex ); // Broadcast to the put condition in case it's waiting pthread_mutex_lock( &this->put_mutex ); pthread_cond_broadcast( &this->put_cond ); pthread_mutex_unlock( &this->put_mutex ); // Join the thread pthread_join( this->ahead_thread, NULL ); // Destroy the mutex pthread_mutex_destroy( &this->mutex ); // Destroy the condition pthread_cond_destroy( &this->cond ); // Wipe the queue while ( mlt_deque_count( this->queue ) ) mlt_frame_close( mlt_deque_pop_back( this->queue ) ); // Close the queue mlt_deque_close( this->queue ); } } /** Flush the read/render thread's buffer. * * \public \memberof mlt_consumer_s * \param this a consumer */ void mlt_consumer_purge( mlt_consumer this ) { if ( this->ahead ) { pthread_mutex_lock( &this->mutex ); while ( mlt_deque_count( this->queue ) ) mlt_frame_close( mlt_deque_pop_back( this->queue ) ); pthread_cond_broadcast( &this->cond ); pthread_mutex_unlock( &this->mutex ); } } /** Get the next frame from the producer connected to a consumer. * * Typically, one uses this instead of \p mlt_consumer_get_frame to make * the asynchronous/real-time behavior configurable at runtime. * You should close the frame returned from this when you are done with it. * * \public \memberof mlt_consumer_s * \param this a consumer * \return a frame */ mlt_frame mlt_consumer_rt_frame( mlt_consumer this ) { // Frame to return mlt_frame frame = NULL; // Get the properties mlt_properties properties = MLT_CONSUMER_PROPERTIES( this ); // Check if the user has requested real time or not if ( this->real_time ) { int size = 1; // Is the read ahead running? if ( this->ahead == 0 ) { int buffer = mlt_properties_get_int( properties, "buffer" ); int prefill = mlt_properties_get_int( properties, "prefill" ); consumer_read_ahead_start( this ); if ( buffer > 1 ) size = prefill > 0 && prefill < buffer ? prefill : buffer; } // Get frame from queue pthread_mutex_lock( &this->mutex ); while( this->ahead && mlt_deque_count( this->queue ) < size ) pthread_cond_wait( &this->cond, &this->mutex ); frame = mlt_deque_pop_front( this->queue ); pthread_cond_broadcast( &this->cond ); pthread_mutex_unlock( &this->mutex ); } else { // Get the frame in non real time frame = mlt_consumer_get_frame( this ); // This isn't true, but from the consumers perspective it is if ( frame != NULL ) mlt_properties_set_int( MLT_FRAME_PROPERTIES( frame ), "rendered", 1 ); } return frame; } /** Callback for the implementation to indicate a stopped condition. * * \public \memberof mlt_consumer_s * \param this a consumer */ void mlt_consumer_stopped( mlt_consumer this ) { mlt_properties_set_int( MLT_CONSUMER_PROPERTIES( this ), "running", 0 ); mlt_events_fire( MLT_CONSUMER_PROPERTIES( this ), "consumer-stopped", NULL ); mlt_event_unblock( this->event_listener ); } /** Stop the consumer. * * \public \memberof mlt_consumer_s * \param this a consumer * \return true if there was an error */ int mlt_consumer_stop( mlt_consumer this ) { // Get the properies mlt_properties properties = MLT_CONSUMER_PROPERTIES( this ); // Just in case... mlt_log( MLT_CONSUMER_SERVICE( this ), MLT_LOG_DEBUG, "stopping put waiting\n" ); pthread_mutex_lock( &this->put_mutex ); this->put_active = 0; pthread_cond_broadcast( &this->put_cond ); pthread_mutex_unlock( &this->put_mutex ); // Stop the consumer mlt_log( MLT_CONSUMER_SERVICE( this ), MLT_LOG_DEBUG, "stopping consumer\n" ); if ( this->stop != NULL ) this->stop( this ); // Check if the user has requested real time or not and stop if necessary mlt_log( MLT_CONSUMER_SERVICE( this ), MLT_LOG_DEBUG, "stopping read_ahead\n" ); if ( mlt_properties_get_int( properties, "real_time" ) ) consumer_read_ahead_stop( this ); // Kill the test card mlt_properties_set_data( properties, "test_card_producer", NULL, 0, NULL, NULL ); // Check and run a post command if ( mlt_properties_get( properties, "post" ) ) if (system( mlt_properties_get( properties, "post" ) ) == -1 ) mlt_log( MLT_CONSUMER_SERVICE( this ), MLT_LOG_ERROR, "system(%s) failed!\n", mlt_properties_get( properties, "post" ) ); mlt_log( MLT_CONSUMER_SERVICE( this ), MLT_LOG_DEBUG, "stopped\n" ); return 0; } /** Determine if the consumer is stopped. * * \public \memberof mlt_consumer_s * \param this a consumer * \return true if the consumer is stopped */ int mlt_consumer_is_stopped( mlt_consumer this ) { // Check if the consumer is stopped if ( this->is_stopped != NULL ) return this->is_stopped( this ); return 0; } /** Close and destroy the consumer. * * \public \memberof mlt_consumer_s * \param this a consumer */ void mlt_consumer_close( mlt_consumer this ) { if ( this != NULL && mlt_properties_dec_ref( MLT_CONSUMER_PROPERTIES( this ) ) <= 0 ) { // Get the childs close function void ( *consumer_close )( ) = this->close; if ( consumer_close ) { // Just in case... //mlt_consumer_stop( this ); this->close = NULL; consumer_close( this ); } else { // Make sure it only gets called once this->parent.close = NULL; // Destroy the push mutex and condition pthread_mutex_destroy( &this->put_mutex ); pthread_cond_destroy( &this->put_cond ); mlt_service_close( &this->parent ); } } }