git.sesse.net Git - mlt/blob - src/framework/mlt_consumer.c

   1 /*
   2  * mlt_consumer.c -- abstraction for all consumer services
   3  * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
   4  * Author: Charles Yates <charles.yates@pandora.be>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software Foundation,
  18  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19  */
  20
  21 #include "config.h"
  22 #include "mlt_consumer.h"
  23 #include "mlt_factory.h"
  24 #include "mlt_producer.h"
  25 #include "mlt_frame.h"
  26 #include <stdio.h>
  27 #include <string.h>
  28 #include <stdlib.h>
  29 #include <sys/time.h>
  30
  31 static void mlt_consumer_frame_show( mlt_listener listener, mlt_properties owner, mlt_service this, void **args );
  32
  33 /** Public final methods
  34 */
  35
  36 int mlt_consumer_init( mlt_consumer this, void *child )
  37 {
  38         int error = 0;
  39         memset( this, 0, sizeof( struct mlt_consumer_s ) );
  40         this->child = child;
  41         error = mlt_service_init( &this->parent, this );
  42         if ( error == 0 )
  43         {
  44                 // Get the properties from the service
  45                 mlt_properties properties = MLT_SERVICE_PROPERTIES( &this->parent );
  46
  47                 // Get the normalisation preference
  48                 char *normalisation = mlt_environment( "MLT_NORMALISATION" );
  49
  50                 // Deal with normalisation
  51                 if ( normalisation == NULL || strcmp( normalisation, "NTSC" ) )
  52                 {
  53                         mlt_properties_set( properties, "normalisation", "PAL" );
  54                         mlt_properties_set_double( properties, "fps", 25.0 );
  55                         mlt_properties_set_int( properties, "width", 720 );
  56                         mlt_properties_set_int( properties, "height", 576 );
  57                         mlt_properties_set_int( properties, "progressive", 0 );
  58                         mlt_properties_set_double( properties, "aspect_ratio", 59.0 / 54.0 );
  59                 }
  60                 else
  61                 {
  62                         mlt_properties_set( properties, "normalisation", "NTSC" );
  63                         mlt_properties_set_double( properties, "fps", 30000.0 / 1001.0 );
  64                         mlt_properties_set_int( properties, "width", 720 );
  65                         mlt_properties_set_int( properties, "height", 480 );
  66                         mlt_properties_set_int( properties, "progressive", 0 );
  67                         mlt_properties_set_double( properties, "aspect_ratio", 10.0 / 11.0 );
  68                 }
  69
  70                 // Default rescaler for all consumers
  71                 mlt_properties_set( properties, "rescale", "bilinear" );
  72
  73                 // Default read ahead buffer size
  74                 mlt_properties_set_int( properties, "buffer", 25 );
  75
  76                 // Default audio frequency and channels
  77                 mlt_properties_set_int( properties, "frequency", 48000 );
  78                 mlt_properties_set_int( properties, "channels", 2 );
  79
  80                 // Default of all consumers is real time
  81                 mlt_properties_set_int( properties, "real_time", 1 );
  82
  83                 // Default to environment test card
  84                 mlt_properties_set( properties, "test_card", mlt_environment( "MLT_TEST_CARD" ) );
  85
  86                 // Hmm - default all consumers to yuv422 :-/
  87                 this->format = mlt_image_yuv422;
  88
  89                 mlt_events_register( properties, "consumer-frame-show", ( mlt_transmitter )mlt_consumer_frame_show );
  90                 mlt_events_register( properties, "consumer-stopped", NULL );
  91
  92                 // Create the push mutex and condition
  93                 pthread_mutex_init( &this->put_mutex, NULL );
  94                 pthread_cond_init( &this->put_cond, NULL );
  95
  96         }
  97         return error;
  98 }
  99
 100 static void mlt_consumer_frame_show( mlt_listener listener, mlt_properties owner, mlt_service this, void **args )
 101 {
 102         if ( listener != NULL )
 103                 listener( owner, this, ( mlt_frame )args[ 0 ] );
 104 }
 105
 106 /** Create a new consumer.
 107 */
 108
 109 mlt_consumer mlt_consumer_new( )
 110 {
 111         // Create the memory for the structure
 112         mlt_consumer this = malloc( sizeof( struct mlt_consumer_s ) );
 113
 114         // Initialise it
 115         if ( this != NULL )
 116                 mlt_consumer_init( this, NULL );
 117
 118         // Return it
 119         return this;
 120 }
 121
 122 /** Get the parent service object.
 123 */
 124
 125 mlt_service mlt_consumer_service( mlt_consumer this )
 126 {
 127         return this != NULL ? &this->parent : NULL;
 128 }
 129
 130 /** Get the consumer properties.
 131 */
 132
 133 mlt_properties mlt_consumer_properties( mlt_consumer this )
 134 {
 135         return this != NULL ? MLT_SERVICE_PROPERTIES( &this->parent ) : NULL;
 136 }
 137
 138 /** Connect the consumer to the producer.
 139 */
 140
 141 int mlt_consumer_connect( mlt_consumer this, mlt_service producer )
 142 {
 143         return mlt_service_connect_producer( &this->parent, producer, 0 );
 144 }
 145
 146 /** Start the consumer.
 147 */
 148
 149 int mlt_consumer_start( mlt_consumer this )
 150 {
 151         // Get the properies
 152         mlt_properties properties = MLT_CONSUMER_PROPERTIES( this );
 153
 154         // Determine if there's a test card producer
 155         char *test_card = mlt_properties_get( properties, "test_card" );
 156
 157         // Just to make sure nothing is hanging around...
 158         mlt_frame_close( this->put );
 159         this->put = NULL;
 160
 161         // Deal with it now.
 162         if ( test_card != NULL )
 163         {
 164                 if ( mlt_properties_get_data( properties, "test_card_producer", NULL ) == NULL )
 165                 {
 166                         // Create a test card producer
 167                         mlt_producer producer = mlt_factory_producer( NULL, test_card );
 168
 169                         // Do we have a producer
 170                         if ( producer != NULL )
 171                         {
 172                                 // Test card should loop I guess...
 173                                 mlt_properties_set( MLT_PRODUCER_PROPERTIES( producer ), "eof", "pause" );
 174                                 mlt_producer_set_speed( producer, 0 );
 175                                 mlt_producer_set_in_and_out( producer, 0, 0 );
 176
 177                                 // Set the test card on the consumer
 178                                 mlt_properties_set_data( properties, "test_card_producer", producer, 0, ( mlt_destructor )mlt_producer_close, NULL );
 179                         }
 180                 }
 181         }
 182         else
 183         {
 184                 // Allow the hash table to speed things up
 185                 mlt_properties_set_data( properties, "test_card_producer", NULL, 0, NULL, NULL );
 186         }
 187
 188         // Check and run an ante command
 189         if ( mlt_properties_get( properties, "ante" ) )
 190                 system( mlt_properties_get( properties, "ante" ) );
 191
 192         // Set the real_time preference
 193         this->real_time = mlt_properties_get_int( properties, "real_time" );
 194
 195         // Start the service
 196         if ( this->start != NULL )
 197                 return this->start( this );
 198
 199         return 0;
 200 }
 201
 202 /** An alternative method to feed frames into the consumer - only valid if
 203         the consumer itself is not connected.
 204 */
 205
 206 int mlt_consumer_put_frame( mlt_consumer this, mlt_frame frame )
 207 {
 208         int error = 1;
 209
 210         // Get the service assoicated to the consumer
 211         mlt_service service = MLT_CONSUMER_SERVICE( this );
 212
 213         if ( mlt_service_producer( service ) == NULL )
 214         {
 215                 struct timeval now;
 216                 struct timespec tm;
 217                 pthread_mutex_lock( &this->put_mutex );
 218                 while ( !mlt_consumer_is_stopped( this ) && this->put != NULL )
 219                 {
 220                         gettimeofday( &now, NULL );
 221                         tm.tv_sec = now.tv_sec + 1;
 222                         tm.tv_nsec = now.tv_usec * 1000;
 223                         pthread_cond_timedwait( &this->put_cond, &this->put_mutex, &tm );
 224                 }
 225                 if ( !mlt_consumer_is_stopped( this ) && this->put == NULL )
 226                         this->put = frame;
 227                 else
 228                         mlt_frame_close( frame );
 229                 pthread_cond_broadcast( &this->put_cond );
 230                 pthread_mutex_unlock( &this->put_mutex );
 231         }
 232         else
 233         {
 234                 mlt_frame_close( frame );
 235         }
 236
 237         return error;
 238 }
 239
 240 /** Protected method for consumer to get frames from connected service
 241 */
 242
 243 mlt_frame mlt_consumer_get_frame( mlt_consumer this )
 244 {
 245         // Frame to return
 246         mlt_frame frame = NULL;
 247
 248         // Get the service assoicated to the consumer
 249         mlt_service service = MLT_CONSUMER_SERVICE( this );
 250
 251         // Get the consumer properties
 252         mlt_properties properties = MLT_CONSUMER_PROPERTIES( this );
 253
 254         // Get the frame
 255         if ( mlt_service_producer( service ) == NULL && mlt_properties_get_int( properties, "put_mode" ) )
 256         {
 257                 struct timeval now;
 258                 struct timespec tm;
 259                 pthread_mutex_lock( &this->put_mutex );
 260                 while ( !mlt_consumer_is_stopped( this ) && this->put == NULL )
 261                 {
 262                         gettimeofday( &now, NULL );
 263                         tm.tv_sec = now.tv_sec + 1;
 264                         tm.tv_nsec = now.tv_usec * 1000;
 265                         pthread_cond_timedwait( &this->put_cond, &this->put_mutex, &tm );
 266                 }
 267                 frame = this->put;
 268                 this->put = NULL;
 269                 pthread_cond_broadcast( &this->put_cond );
 270                 pthread_mutex_unlock( &this->put_mutex );
 271                 if ( frame != NULL )
 272                         mlt_service_apply_filters( service, frame, 0 );
 273         }
 274         else if ( mlt_service_producer( service ) != NULL )
 275         {
 276                 mlt_service_get_frame( service, &frame, 0 );
 277         }
 278
 279         if ( frame != NULL )
 280         {
 281                 // Get the frame properties
 282                 mlt_properties frame_properties = MLT_FRAME_PROPERTIES( frame );
 283
 284                 // Get the test card producer
 285                 mlt_producer test_card = mlt_properties_get_data( properties, "test_card_producer", NULL );
 286
 287                 // Attach the test frame producer to it.
 288                 if ( test_card != NULL )
 289                         mlt_properties_set_data( frame_properties, "test_card_producer", test_card, 0, NULL, NULL );
 290
 291                 // Attach the rescale property
 292                 mlt_properties_set( frame_properties, "rescale.interp", mlt_properties_get( properties, "rescale" ) );
 293
 294                 // Aspect ratio and other jiggery pokery
 295                 mlt_properties_set_double( frame_properties, "consumer_aspect_ratio", mlt_properties_get_double( properties, "aspect_ratio" ) );
 296                 if ( mlt_properties_get_int( properties, "progressive" ) || mlt_properties_get_int( properties, "deinterlace" ) )
 297                         mlt_properties_set_int( frame_properties, "consumer_deinterlace", 1 );
 298         }
 299
 300         // Return the frame
 301         return frame;
 302 }
 303
 304 static inline long time_difference( struct timeval *time1 )
 305 {
 306         struct timeval time2;
 307         time2.tv_sec = time1->tv_sec;
 308         time2.tv_usec = time1->tv_usec;
 309         gettimeofday( time1, NULL );
 310         return time1->tv_sec * 1000000 + time1->tv_usec - time2.tv_sec * 1000000 - time2.tv_usec;
 311 }
 312
 313 static void *consumer_read_ahead_thread( void *arg )
 314 {
 315         // The argument is the consumer
 316         mlt_consumer this = arg;
 317
 318         // Get the properties of the consumer
 319         mlt_properties properties = MLT_CONSUMER_PROPERTIES( this );
 320
 321         // Get the width and height
 322         int width = mlt_properties_get_int( properties, "width" );
 323         int height = mlt_properties_get_int( properties, "height" );
 324
 325         // See if video is turned off
 326         int video_off = mlt_properties_get_int( properties, "video_off" );
 327
 328         // Get the audio settings
 329         mlt_audio_format afmt = mlt_audio_pcm;
 330         int counter = 0;
 331         double fps = mlt_properties_get_double( properties, "fps" );
 332         int channels = mlt_properties_get_int( properties, "channels" );
 333         int frequency = mlt_properties_get_int( properties, "frequency" );
 334         int samples = 0;
 335         int16_t *pcm = NULL;
 336
 337         // See if audio is turned off
 338         int audio_off = mlt_properties_get_int( properties, "audio_off" );
 339
 340         // Get the maximum size of the buffer
 341         int buffer = mlt_properties_get_int( properties, "buffer" ) + 1;
 342
 343         // General frame variable
 344         mlt_frame frame = NULL;
 345         uint8_t *image = NULL;
 346
 347         // Time structures
 348         struct timeval ante;
 349
 350         // Average time for get_frame and get_image
 351         int count = 1;
 352         int skipped = 0;
 353         int64_t time_wait = 0;
 354         int64_t time_frame = 0;
 355         int64_t time_process = 0;
 356         int skip_next = 0;
 357
 358         // Get the first frame
 359         frame = mlt_consumer_get_frame( this );
 360
 361         // Get the image of the first frame
 362         if ( !video_off )
 363                 mlt_frame_get_image( frame, &image, &this->format, &width, &height, 0 );
 364
 365         if ( !audio_off )
 366         {
 367                 samples = mlt_sample_calculator( fps, frequency, counter++ );
 368                 mlt_frame_get_audio( frame, &pcm, &afmt, &frequency, &channels, &samples );
 369         }
 370
 371         mlt_properties_set_int( MLT_FRAME_PROPERTIES( frame ), "rendered", 1 );
 372
 373         // Get the starting time (can ignore the times above)
 374         gettimeofday( &ante, NULL );
 375
 376         // Continue to read ahead
 377         while ( this->ahead )
 378         {
 379                 // Put the current frame into the queue
 380                 pthread_mutex_lock( &this->mutex );
 381                 while( this->ahead && mlt_deque_count( this->queue ) >= buffer )
 382                         pthread_cond_wait( &this->cond, &this->mutex );
 383                 mlt_deque_push_back( this->queue, frame );
 384                 pthread_cond_broadcast( &this->cond );
 385                 pthread_mutex_unlock( &this->mutex );
 386
 387                 time_wait += time_difference( &ante );
 388
 389                 // Get the next frame
 390                 frame = mlt_consumer_get_frame( this );
 391                 time_frame += time_difference( &ante );
 392
 393                 // If there's no frame, we're probably stopped...
 394                 if ( frame == NULL )
 395                         continue;
 396
 397                 // Increment the count
 398                 count ++;
 399
 400                 // All non normal playback frames should be shown
 401                 if ( mlt_properties_get_int( MLT_FRAME_PROPERTIES( frame ), "_speed" ) != 1 )
 402                 {
 403                         skipped = 0;
 404                         time_frame = 0;
 405                         time_process = 0;
 406                         time_wait = 0;
 407                         count = 1;
 408                         skip_next = 0;
 409                 }
 410
 411                 // Get the image
 412                 if ( !skip_next )
 413                 {
 414                         // Get the image, mark as rendered and time it
 415                         if ( !video_off )
 416                                 mlt_frame_get_image( frame, &image, &this->format, &width, &height, 0 );
 417                         mlt_properties_set_int( MLT_FRAME_PROPERTIES( frame ), "rendered", 1 );
 418                 }
 419                 else
 420                 {
 421                         // Increment the number of sequentially skipped frames
 422                         skipped ++;
 423                         skip_next = 0;
 424
 425                         // If we've reached an unacceptable level, reset everything
 426                         if ( skipped > 5 )
 427                         {
 428                                 skipped = 0;
 429                                 time_frame = 0;
 430                                 time_process = 0;
 431                                 time_wait = 0;
 432                                 count = 1;
 433                         }
 434                 }
 435
 436                 // Always process audio
 437                 if ( !audio_off )
 438                 {
 439                         samples = mlt_sample_calculator( fps, frequency, counter++ );
 440                         mlt_frame_get_audio( frame, &pcm, &afmt, &frequency, &channels, &samples );
 441                 }
 442
 443                 // Increment the time take for this frame
 444                 time_process += time_difference( &ante );
 445
 446                 // Determine if the next frame should be skipped
 447                 if ( mlt_deque_count( this->queue ) <= 5 && ( ( time_wait + time_frame + time_process ) / count ) > 40000 )
 448                         skip_next = 1;
 449         }
 450
 451         // Remove the last frame
 452         mlt_frame_close( frame );
 453
 454         return NULL;
 455 }
 456
 457 static void consumer_read_ahead_start( mlt_consumer this )
 458 {
 459         pthread_attr_t thread_attributes;
 460
 461         // We're running now
 462         this->ahead = 1;
 463
 464         // Create the frame queue
 465         this->queue = mlt_deque_init( );
 466
 467         // Create the mutex
 468         pthread_mutex_init( &this->mutex, NULL );
 469
 470         // Create the condition
 471         pthread_cond_init( &this->cond, NULL );
 472
 473         // Inherit the scheduling priority
 474         pthread_attr_init( &thread_attributes );
 475         pthread_attr_setinheritsched( &thread_attributes, PTHREAD_INHERIT_SCHED );
 476
 477         // Create the read ahead
 478         pthread_create( &this->ahead_thread, &thread_attributes, consumer_read_ahead_thread, this );
 479 }
 480
 481 static void consumer_read_ahead_stop( mlt_consumer this )
 482 {
 483         // Make sure we're running
 484         if ( this->ahead )
 485         {
 486                 // Inform thread to stop
 487                 this->ahead = 0;
 488
 489                 // Broadcast to the condition in case it's waiting
 490                 pthread_mutex_lock( &this->mutex );
 491                 pthread_cond_broadcast( &this->cond );
 492                 pthread_mutex_unlock( &this->mutex );
 493
 494                 // Broadcast to the put condition in case it's waiting
 495                 pthread_mutex_lock( &this->put_mutex );
 496                 pthread_cond_broadcast( &this->put_cond );
 497                 pthread_mutex_unlock( &this->put_mutex );
 498
 499                 // Join the thread
 500                 pthread_join( this->ahead_thread, NULL );
 501
 502                 // Destroy the mutex
 503                 pthread_mutex_destroy( &this->mutex );
 504
 505                 // Destroy the condition
 506                 pthread_cond_destroy( &this->cond );
 507
 508                 // Wipe the queue
 509                 while ( mlt_deque_count( this->queue ) )
 510                         mlt_frame_close( mlt_deque_pop_back( this->queue ) );
 511
 512                 // Close the queue
 513                 mlt_deque_close( this->queue );
 514         }
 515 }
 516
 517 void mlt_consumer_purge( mlt_consumer this )
 518 {
 519         if ( this->ahead )
 520         {
 521                 pthread_mutex_lock( &this->mutex );
 522                 while ( mlt_deque_count( this->queue ) )
 523                         mlt_frame_close( mlt_deque_pop_back( this->queue ) );
 524                 pthread_cond_broadcast( &this->cond );
 525                 pthread_mutex_unlock( &this->mutex );
 526         }
 527 }
 528
 529 mlt_frame mlt_consumer_rt_frame( mlt_consumer this )
 530 {
 531         // Frame to return
 532         mlt_frame frame = NULL;
 533
 534         // Get the properties
 535         mlt_properties properties = MLT_CONSUMER_PROPERTIES( this );
 536
 537         // Check if the user has requested real time or not
 538         if ( this->real_time )
 539         {
 540                 int size = 1;
 541
 542                 // Is the read ahead running?
 543                 if ( this->ahead == 0 )
 544                 {
 545                         int buffer = mlt_properties_get_int( properties, "buffer" );
 546                         int prefill = mlt_properties_get_int( properties, "prefill" );
 547                         consumer_read_ahead_start( this );
 548                         if ( buffer > 1 )
 549                                 size = prefill > 0 && prefill < buffer ? prefill : buffer;
 550                 }
 551
 552                 // Get frame from queue
 553                 pthread_mutex_lock( &this->mutex );
 554                 while( this->ahead && mlt_deque_count( this->queue ) < size )
 555                         pthread_cond_wait( &this->cond, &this->mutex );
 556                 frame = mlt_deque_pop_front( this->queue );
 557                 pthread_cond_broadcast( &this->cond );
 558                 pthread_mutex_unlock( &this->mutex );
 559         }
 560         else
 561         {
 562                 // Get the frame in non real time
 563                 frame = mlt_consumer_get_frame( this );
 564
 565                 // This isn't true, but from the consumers perspective it is
 566                 if ( frame != NULL )
 567                         mlt_properties_set_int( MLT_FRAME_PROPERTIES( frame ), "rendered", 1 );
 568         }
 569
 570         return frame;
 571 }
 572
 573 /** Callback for the implementation to indicate a stopped condition.
 574 */
 575
 576 void mlt_consumer_stopped( mlt_consumer this )
 577 {
 578         mlt_properties_set_int( MLT_CONSUMER_PROPERTIES( this ), "running", 0 );
 579         mlt_events_fire( MLT_CONSUMER_PROPERTIES( this ), "consumer-stopped", NULL );
 580 }
 581
 582 /** Stop the consumer.
 583 */
 584
 585 int mlt_consumer_stop( mlt_consumer this )
 586 {
 587         // Get the properies
 588         mlt_properties properties = MLT_CONSUMER_PROPERTIES( this );
 589
 590         // Stop the consumer
 591         if ( this->stop != NULL )
 592                 this->stop( this );
 593
 594         // Check if the user has requested real time or not and stop if necessary
 595         if ( mlt_properties_get_int( properties, "real_time" ) )
 596                 consumer_read_ahead_stop( this );
 597
 598         // Just in case...
 599         pthread_mutex_lock( &this->put_mutex );
 600         if ( this->put != NULL )
 601         {
 602                 mlt_frame_close( this->put );
 603                 this->put = NULL;
 604         }
 605         pthread_cond_broadcast( &this->put_cond );
 606         pthread_mutex_unlock( &this->put_mutex );
 607
 608         // Kill the test card
 609         mlt_properties_set_data( properties, "test_card_producer", NULL, 0, NULL, NULL );
 610
 611         // Check and run a post command
 612         if ( mlt_properties_get( properties, "post" ) )
 613                 system( mlt_properties_get( properties, "post" ) );
 614
 615         return 0;
 616 }
 617
 618 /** Determine if the consumer is stopped.
 619 */
 620
 621 int mlt_consumer_is_stopped( mlt_consumer this )
 622 {
 623         // Check if the consumer is stopped
 624         if ( this->is_stopped != NULL )
 625                 return this->is_stopped( this );
 626
 627         return 0;
 628 }
 629
 630 /** Close the consumer.
 631 */
 632
 633 void mlt_consumer_close( mlt_consumer this )
 634 {
 635         if ( this != NULL && mlt_properties_dec_ref( MLT_CONSUMER_PROPERTIES( this ) ) <= 0 )
 636         {
 637                 // Get the childs close function
 638                 void ( *consumer_close )( ) = this->close;
 639
 640                 if ( consumer_close )
 641                 {
 642                         // Just in case...
 643                         mlt_consumer_stop( this );
 644
 645                         this->close = NULL;
 646                         consumer_close( this );
 647                 }
 648                 else
 649                 {
 650
 651                         // Make sure it only gets called once
 652                         this->parent.close = NULL;
 653
 654                         // Destroy the push mutex and condition
 655                         pthread_cond_broadcast( &this->put_cond );
 656                         pthread_mutex_destroy( &this->put_mutex );
 657                         pthread_cond_destroy( &this->put_cond );
 658
 659                         mlt_service_close( &this->parent );
 660                 }
 661         }
 662 }