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

   1 /*
   2  * mlt_tractor.c -- tractor service class
   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
  23 #include "mlt_tractor.h"
  24 #include "mlt_frame.h"
  25 #include "mlt_multitrack.h"
  26 #include "mlt_field.h"
  27
  28 #include <stdio.h>
  29 #include <stdlib.h>
  30 #include <string.h>
  31 #include <ctype.h>
  32
  33 /** Forward references to static methods.
  34 */
  35
  36 static int producer_get_frame( mlt_producer this, mlt_frame_ptr frame, int track );
  37 static void mlt_tractor_listener( mlt_multitrack tracks, mlt_tractor this );
  38
  39 /** Constructor for the tractor.
  40 */
  41
  42 mlt_tractor mlt_tractor_init( )
  43 {
  44         mlt_tractor this = calloc( sizeof( struct mlt_tractor_s ), 1 );
  45         if ( this != NULL )
  46         {
  47                 mlt_producer producer = &this->parent;
  48                 if ( mlt_producer_init( producer, this ) == 0 )
  49                 {
  50                         mlt_properties properties = MLT_PRODUCER_PROPERTIES( producer );
  51
  52                         mlt_properties_set( properties, "resource", "<tractor>" );
  53                         mlt_properties_set( properties, "mlt_type", "mlt_producer" );
  54                         mlt_properties_set( properties, "mlt_service", "tractor" );
  55                         mlt_properties_set_int( properties, "in", 0 );
  56                         mlt_properties_set_int( properties, "out", -1 );
  57                         mlt_properties_set_int( properties, "length", 0 );
  58
  59                         producer->get_frame = producer_get_frame;
  60                         producer->close = ( mlt_destructor )mlt_tractor_close;
  61                         producer->close_object = this;
  62                 }
  63                 else
  64                 {
  65                         free( this );
  66                         this = NULL;
  67                 }
  68         }
  69         return this;
  70 }
  71
  72 mlt_tractor mlt_tractor_new( )
  73 {
  74         mlt_tractor this = calloc( sizeof( struct mlt_tractor_s ), 1 );
  75         if ( this != NULL )
  76         {
  77                 mlt_producer producer = &this->parent;
  78                 if ( mlt_producer_init( producer, this ) == 0 )
  79                 {
  80                         mlt_multitrack multitrack = mlt_multitrack_init( );
  81                         mlt_field field = mlt_field_new( multitrack, this );
  82                         mlt_properties props = MLT_PRODUCER_PROPERTIES( producer );
  83
  84                         mlt_properties_set( props, "resource", "<tractor>" );
  85                         mlt_properties_set( props, "mlt_type", "mlt_producer" );
  86                         mlt_properties_set( props, "mlt_service", "tractor" );
  87                         mlt_properties_set_position( props, "in", 0 );
  88                         mlt_properties_set_position( props, "out", 0 );
  89                         mlt_properties_set_position( props, "length", 0 );
  90                         mlt_properties_set_data( props, "multitrack", multitrack, 0, ( mlt_destructor )mlt_multitrack_close, NULL );
  91                         mlt_properties_set_data( props, "field", field, 0, ( mlt_destructor )mlt_field_close, NULL );
  92
  93                         mlt_events_listen( MLT_MULTITRACK_PROPERTIES( multitrack ), this, "producer-changed", ( mlt_listener )mlt_tractor_listener );
  94
  95                         producer->get_frame = producer_get_frame;
  96                         producer->close = ( mlt_destructor )mlt_tractor_close;
  97                         producer->close_object = this;
  98                 }
  99                 else
 100                 {
 101                         free( this );
 102                         this = NULL;
 103                 }
 104         }
 105         return this;
 106 }
 107
 108 /** Get the service object associated to the tractor.
 109 */
 110
 111 mlt_service mlt_tractor_service( mlt_tractor this )
 112 {
 113         return MLT_PRODUCER_SERVICE( &this->parent );
 114 }
 115
 116 /** Get the producer object associated to the tractor.
 117 */
 118
 119 mlt_producer mlt_tractor_producer( mlt_tractor this )
 120 {
 121         return this != NULL ? &this->parent : NULL;
 122 }
 123
 124 /** Get the properties object associated to the tractor.
 125 */
 126
 127 mlt_properties mlt_tractor_properties( mlt_tractor this )
 128 {
 129         return MLT_PRODUCER_PROPERTIES( &this->parent );
 130 }
 131
 132 /** Get the field this tractor is harvesting.
 133 */
 134
 135 mlt_field mlt_tractor_field( mlt_tractor this )
 136 {
 137         return mlt_properties_get_data( MLT_TRACTOR_PROPERTIES( this ), "field", NULL );
 138 }
 139
 140 /** Get the multitrack this tractor is pulling.
 141 */
 142
 143 mlt_multitrack mlt_tractor_multitrack( mlt_tractor this )
 144 {
 145         return mlt_properties_get_data( MLT_TRACTOR_PROPERTIES( this ), "multitrack", NULL );
 146 }
 147
 148 /** Ensure the tractors in/out points match the multitrack.
 149 */
 150
 151 void mlt_tractor_refresh( mlt_tractor this )
 152 {
 153         mlt_multitrack multitrack = mlt_tractor_multitrack( this );
 154         mlt_properties properties = MLT_MULTITRACK_PROPERTIES( multitrack );
 155         mlt_properties self = MLT_TRACTOR_PROPERTIES( this );
 156         mlt_events_block( properties, self );
 157         mlt_events_block( self, self );
 158         mlt_multitrack_refresh( multitrack );
 159         mlt_properties_set_position( self, "in", 0 );
 160         mlt_properties_set_position( self, "out", mlt_properties_get_position( properties, "out" ) );
 161         mlt_events_unblock( self, self );
 162         mlt_events_unblock( properties, self );
 163         mlt_properties_set_position( self, "length", mlt_properties_get_position( properties, "length" ) );
 164 }
 165
 166 static void mlt_tractor_listener( mlt_multitrack tracks, mlt_tractor this )
 167 {
 168         mlt_tractor_refresh( this );
 169 }
 170
 171 /** Connect the tractor.
 172 */
 173
 174 int mlt_tractor_connect( mlt_tractor this, mlt_service producer )
 175 {
 176         int ret = mlt_service_connect_producer( MLT_TRACTOR_SERVICE( this ), producer, 0 );
 177
 178         // This is the producer we're going to connect to
 179         if ( ret == 0 )
 180                 this->producer = producer;
 181
 182         return ret;
 183 }
 184
 185 /** Set the producer for a specific track.
 186 */
 187
 188 int mlt_tractor_set_track( mlt_tractor this, mlt_producer producer, int index )
 189 {
 190         return mlt_multitrack_connect( mlt_tractor_multitrack( this ), producer, index );
 191 }
 192
 193 /** Get the producer for a specific track.
 194 */
 195
 196 mlt_producer mlt_tractor_get_track( mlt_tractor this, int index )
 197 {
 198         return mlt_multitrack_track( mlt_tractor_multitrack( this ), index );
 199 }
 200
 201 static int producer_get_image( mlt_frame this, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
 202 {
 203         uint8_t *data = NULL;
 204         mlt_properties properties = MLT_FRAME_PROPERTIES( this );
 205         mlt_frame frame = mlt_frame_pop_service( this );
 206         mlt_properties frame_properties = MLT_FRAME_PROPERTIES( frame );
 207         mlt_properties_set_int( frame_properties, "width", mlt_properties_get_int( properties, "width" ) );
 208         mlt_properties_set_int( frame_properties, "height", mlt_properties_get_int( properties, "height" ) );
 209         mlt_properties_set( frame_properties, "rescale.interp", mlt_properties_get( properties, "rescale.interp" ) );
 210         mlt_properties_set_int( frame_properties, "distort", mlt_properties_get_int( properties, "distort" ) );
 211         mlt_properties_set_double( frame_properties, "consumer_aspect_ratio", mlt_properties_get_double( properties, "consumer_aspect_ratio" ) );
 212         mlt_properties_set_int( frame_properties, "consumer_deinterlace", mlt_properties_get_double( properties, "consumer_deinterlace" ) );
 213         mlt_properties_set( frame_properties, "deinterlace_method", mlt_properties_get( properties, "deinterlace_method" ) );
 214         mlt_properties_set_int( frame_properties, "normalised_width", mlt_properties_get_double( properties, "normalised_width" ) );
 215         mlt_properties_set_int( frame_properties, "normalised_height", mlt_properties_get_double( properties, "normalised_height" ) );
 216         mlt_frame_get_image( frame, buffer, format, width, height, writable );
 217         mlt_properties_set_data( properties, "image", *buffer, *width * *height * 2, NULL, NULL );
 218         mlt_properties_set_int( properties, "width", *width );
 219         mlt_properties_set_int( properties, "height", *height );
 220         mlt_properties_set_double( properties, "aspect_ratio", mlt_frame_get_aspect_ratio( frame ) );
 221         mlt_properties_set_int( properties, "progressive", mlt_properties_get_int( frame_properties, "progressive" ) );
 222         mlt_properties_set_int( properties, "distort", mlt_properties_get_int( frame_properties, "distort" ) );
 223         data = mlt_frame_get_alpha_mask( frame );
 224         mlt_properties_set_data( properties, "alpha", data, 0, NULL, NULL );
 225         return 0;
 226 }
 227
 228 static int producer_get_audio( mlt_frame this, int16_t **buffer, mlt_audio_format *format, int *frequency, int *channels, int *samples )
 229 {
 230         mlt_properties properties = MLT_FRAME_PROPERTIES( this );
 231         mlt_frame frame = mlt_frame_pop_audio( this );
 232         mlt_frame_get_audio( frame, buffer, format, frequency, channels, samples );
 233         mlt_properties_set_data( properties, "audio", *buffer, 0, NULL, NULL );
 234         mlt_properties_set_int( properties, "frequency", *frequency );
 235         mlt_properties_set_int( properties, "channels", *channels );
 236         return 0;
 237 }
 238
 239 static void destroy_data_queue( void *arg )
 240 {
 241         if ( arg != NULL )
 242         {
 243                 // Assign the correct type
 244                 mlt_deque queue = arg;
 245
 246                 // Iterate through each item and destroy them
 247                 while ( mlt_deque_peek_front( queue ) != NULL )
 248                         mlt_properties_close( mlt_deque_pop_back( queue ) );
 249
 250                 // Close the deque
 251                 mlt_deque_close( queue );
 252         }
 253 }
 254
 255 /** Get the next frame.
 256
 257         TODO: This function needs to be redesigned...
 258 */
 259
 260 static int producer_get_frame( mlt_producer parent, mlt_frame_ptr frame, int track )
 261 {
 262         mlt_tractor this = parent->child;
 263
 264         // We only respond to the first track requests
 265         if ( track == 0 && this->producer != NULL )
 266         {
 267                 int i = 0;
 268                 int done = 0;
 269                 mlt_frame temp = NULL;
 270                 int count = 0;
 271
 272                 // Get the properties of the parent producer
 273                 mlt_properties properties = MLT_PRODUCER_PROPERTIES( parent );
 274
 275                 // Try to obtain the multitrack associated to the tractor
 276                 mlt_multitrack multitrack = mlt_properties_get_data( properties, "multitrack", NULL );
 277
 278                 // Or a specific producer
 279                 mlt_producer producer = mlt_properties_get_data( properties, "producer", NULL );
 280
 281                 // The output frame will hold the 'global' data feeds (ie: those which are targetted for the final frame)
 282                 mlt_deque data_queue = mlt_deque_init( );
 283
 284                 // Determine whether this tractor feeds to the consumer or stops here
 285                 int global_feed = mlt_properties_get_int( properties, "global_feed" );
 286
 287                 // If we don't have one, we're in trouble...
 288                 if ( multitrack != NULL )
 289                 {
 290                         // Used to garbage collect all frames
 291                         char label[ 30 ];
 292
 293                         // Get the id of the tractor
 294                         char *id = mlt_properties_get( properties, "_unique_id" );
 295
 296                         // Will be used to store the frame properties object
 297                         mlt_properties frame_properties = NULL;
 298
 299                         // We'll store audio and video frames to use here
 300                         mlt_frame audio = NULL;
 301                         mlt_frame video = NULL;
 302
 303                         // Temporary properties
 304                         mlt_properties temp_properties = NULL;
 305
 306                         // Get the multitrack's producer
 307                         mlt_producer target = MLT_MULTITRACK_PRODUCER( multitrack );
 308                         mlt_producer_seek( target, mlt_producer_frame( parent ) );
 309                         mlt_producer_set_speed( target, mlt_producer_get_speed( parent ) );
 310
 311                         // We will create one frame and attach everything to it
 312                         *frame = mlt_frame_init( );
 313
 314                         // Get the properties of the frame
 315                         frame_properties = MLT_FRAME_PROPERTIES( *frame );
 316
 317                         // Loop through each of the tracks we're harvesting
 318                         for ( i = 0; !done; i ++ )
 319                         {
 320                                 // Get a frame from the producer
 321                                 mlt_service_get_frame( this->producer, &temp, i );
 322
 323                                 // Get the temporary properties
 324                                 temp_properties = MLT_FRAME_PROPERTIES( temp );
 325
 326                                 // Check for last track
 327                                 done = mlt_properties_get_int( temp_properties, "last_track" );
 328
 329                                 // Handle fx only tracks
 330                                 if ( mlt_properties_get_int( temp_properties, "meta.fx_cut" ) )
 331                                 {
 332                                         mlt_properties copy = video == NULL ? frame_properties : MLT_FRAME_PROPERTIES( video );
 333                                         int i = 0;
 334
 335                                         for ( i = 0; i < mlt_properties_count( temp_properties ); i ++ )
 336                                         {
 337                                                 char *name = mlt_properties_get_name( temp_properties, i );
 338                                                 char *value = mlt_properties_get_value( temp_properties, i );
 339                                                 // For animated filters
 340                                                 if ( isdigit( name[ 0 ] ) && value != NULL )
 341                                                         mlt_properties_set( copy, name, value );
 342                                         }
 343
 344                                         if ( video )
 345                                         {
 346                                                 // Take all but the first placeholding producer and dump on to the image stack
 347                                                 void *p = mlt_deque_pop_front( MLT_FRAME_IMAGE_STACK( temp ) );
 348                                                 while ( ( p = mlt_deque_pop_front( MLT_FRAME_IMAGE_STACK( temp ) ) ) != NULL )
 349                                                         mlt_deque_push_back( MLT_FRAME_IMAGE_STACK( video ), p );
 350                                         }
 351                                         else
 352                                         {
 353                                                 void *p = NULL;
 354                                                 while ( ( p = mlt_deque_pop_front( MLT_FRAME_IMAGE_STACK( temp ) ) ) != NULL )
 355                                                         mlt_deque_push_back( MLT_FRAME_IMAGE_STACK( *frame ), p );
 356                                                 mlt_properties_set_int( frame_properties, "meta.fx_cut", 1 );
 357                                         }
 358
 359                                         if ( audio )
 360                                         {
 361                                                 // Take all but the first placeholding producer and dump on to the audio stack
 362                                                 void *p = mlt_deque_pop_front( MLT_FRAME_AUDIO_STACK( temp ) );
 363                                                 while ( ( p = mlt_deque_pop_front( MLT_FRAME_AUDIO_STACK( temp ) ) ) != NULL )
 364                                                         mlt_deque_push_back( MLT_FRAME_AUDIO_STACK( audio ), p );
 365                                         }
 366                                         else
 367                                         {
 368                                                 void *p = NULL;
 369                                                 while ( ( p = mlt_deque_pop_front( MLT_FRAME_AUDIO_STACK( temp ) ) ) != NULL )
 370                                                         mlt_deque_push_back( MLT_FRAME_AUDIO_STACK( *frame ), p );
 371                                                 mlt_properties_set_int( frame_properties, "meta.fx_cut", 1 );
 372                                         }
 373
 374                                         // Ensure everything is hidden
 375                                         mlt_properties_set_int( temp_properties, "hide", 3 );
 376                                 }
 377
 378                                 // We store all frames with a destructor on the output frame
 379                                 sprintf( label, "_%s_%d", id, count ++ );
 380                                 mlt_properties_set_data( frame_properties, label, temp, 0, ( mlt_destructor )mlt_frame_close, NULL );
 381
 382                                 // We want to append all 'final' feeds to the global queue
 383                                 if ( !done && mlt_properties_get_data( temp_properties, "data_queue", NULL ) != NULL )
 384                                 {
 385                                         // Move the contents of this queue on to the output frames data queue
 386                                         mlt_deque sub_queue = mlt_properties_get_data( MLT_FRAME_PROPERTIES( temp ), "data_queue", NULL );
 387                                         mlt_deque temp = mlt_deque_init( );
 388                                         while ( global_feed && mlt_deque_count( sub_queue ) )
 389                                         {
 390                                                 mlt_properties p = mlt_deque_pop_back( sub_queue );
 391                                                 if ( mlt_properties_get_int( p, "final" ) )
 392                                                         mlt_deque_push_back( data_queue, p );
 393                                                 else
 394                                                         mlt_deque_push_back( temp, p );
 395                                         }
 396                                         while( mlt_deque_count( temp ) )
 397                                                 mlt_deque_push_front( sub_queue, mlt_deque_pop_back( temp ) );
 398                                         mlt_deque_close( temp );
 399                                 }
 400
 401                                 // Now do the same with the global queue but without the conditional behaviour
 402                                 if ( mlt_properties_get_data( temp_properties, "global_queue", NULL ) != NULL )
 403                                 {
 404                                         mlt_deque sub_queue = mlt_properties_get_data( MLT_FRAME_PROPERTIES( temp ), "global_queue", NULL );
 405                                         while ( mlt_deque_count( sub_queue ) )
 406                                         {
 407                                                 mlt_properties p = mlt_deque_pop_back( sub_queue );
 408                                                 mlt_deque_push_back( data_queue, p );
 409                                         }
 410                                 }
 411
 412                                 // Pick up first video and audio frames
 413                                 if ( !done && !mlt_frame_is_test_audio( temp ) && !( mlt_properties_get_int( temp_properties, "hide" ) & 2 ) )
 414                                 {
 415                                         // Order of frame creation is starting to get problematic
 416                                         if ( audio != NULL )
 417                                         {
 418                                                 mlt_deque_push_front( MLT_FRAME_AUDIO_STACK( temp ), producer_get_audio );
 419                                                 mlt_deque_push_front( MLT_FRAME_AUDIO_STACK( temp ), audio );
 420                                         }
 421                                         audio = temp;
 422                                 }
 423                                 if ( !done && !mlt_frame_is_test_card( temp ) && !( mlt_properties_get_int( temp_properties, "hide" ) & 1 ) )
 424                                 {
 425                                         if ( video != NULL )
 426                                         {
 427                                                 mlt_deque_push_front( MLT_FRAME_IMAGE_STACK( temp ), producer_get_image );
 428                                                 mlt_deque_push_front( MLT_FRAME_IMAGE_STACK( temp ), video );
 429                                         }
 430                                         video = temp;
 431                                 }
 432                         }
 433
 434                         // Now stack callbacks
 435                         if ( audio != NULL )
 436                         {
 437                                 mlt_frame_push_audio( *frame, audio );
 438                                 mlt_frame_push_audio( *frame, producer_get_audio );
 439                         }
 440
 441                         if ( video != NULL )
 442                         {
 443                                 mlt_properties video_properties = MLT_FRAME_PROPERTIES( video );
 444                                 mlt_frame_push_service( *frame, video );
 445                                 mlt_frame_push_service( *frame, producer_get_image );
 446                                 if ( global_feed )
 447                                         mlt_properties_set_data( frame_properties, "data_queue", data_queue, 0, NULL, NULL );
 448                                 mlt_properties_set_data( video_properties, "global_queue", data_queue, 0, destroy_data_queue, NULL );
 449                                 mlt_properties_set_int( frame_properties, "width", mlt_properties_get_int( video_properties, "width" ) );
 450                                 mlt_properties_set_int( frame_properties, "height", mlt_properties_get_int( video_properties, "height" ) );
 451                                 mlt_properties_set_int( frame_properties, "real_width", mlt_properties_get_int( video_properties, "real_width" ) );
 452                                 mlt_properties_set_int( frame_properties, "real_height", mlt_properties_get_int( video_properties, "real_height" ) );
 453                                 mlt_properties_set_int( frame_properties, "progressive", mlt_properties_get_int( video_properties, "progressive" ) );
 454                                 mlt_properties_set_double( frame_properties, "aspect_ratio", mlt_properties_get_double( video_properties, "aspect_ratio" ) );
 455                         }
 456                         else
 457                         {
 458                                 destroy_data_queue( data_queue );
 459                         }
 460
 461                         mlt_frame_set_position( *frame, mlt_producer_frame( parent ) );
 462                         mlt_properties_set_int( MLT_FRAME_PROPERTIES( *frame ), "test_audio", audio == NULL );
 463                         mlt_properties_set_int( MLT_FRAME_PROPERTIES( *frame ), "test_image", video == NULL );
 464                         mlt_properties_set_data( MLT_FRAME_PROPERTIES( *frame ), "consumer_lock_service", this, 0, NULL, NULL );
 465                 }
 466                 else if ( producer != NULL )
 467                 {
 468                         mlt_producer_seek( producer, mlt_producer_frame( parent ) );
 469                         mlt_producer_set_speed( producer, mlt_producer_get_speed( parent ) );
 470                         mlt_service_get_frame( this->producer, frame, track );
 471                 }
 472                 else
 473                 {
 474                         fprintf( stderr, "tractor without a multitrack!!\n" );
 475                         mlt_service_get_frame( this->producer, frame, track );
 476                 }
 477
 478                 // Prepare the next frame
 479                 mlt_producer_prepare_next( parent );
 480
 481                 // Indicate our found status
 482                 return 0;
 483         }
 484         else
 485         {
 486                 // Generate a test card
 487                 *frame = mlt_frame_init( );
 488                 return 0;
 489         }
 490 }
 491
 492 /** Close the tractor.
 493 */
 494
 495 void mlt_tractor_close( mlt_tractor this )
 496 {
 497         if ( this != NULL && mlt_properties_dec_ref( MLT_TRACTOR_PROPERTIES( this ) ) <= 0 )
 498         {
 499                 this->parent.close = NULL;
 500                 mlt_producer_close( &this->parent );
 501                 free( this );
 502         }
 503 }
 504