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