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         if ( mlt_properties_get( properties, "distort" ) )
 210                 mlt_properties_set( frame_properties, "distort", mlt_properties_get( 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_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         if ( mlt_properties_get( frame_properties, "distort" ) )
 222                 mlt_properties_set( properties, "distort", mlt_properties_get( 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 /** Get the next frame.
 240 */
 241
 242 static int producer_get_frame( mlt_producer parent, mlt_frame_ptr frame, int track )
 243 {
 244         mlt_tractor this = parent->child;
 245
 246         // We only respond to the first track requests
 247         if ( track == 0 && this->producer != NULL )
 248         {
 249                 int i = 0;
 250                 int done = 0;
 251                 mlt_frame temp = NULL;
 252                 int count = 0;
 253
 254                 // Get the properties of the parent producer
 255                 mlt_properties properties = MLT_PRODUCER_PROPERTIES( parent );
 256
 257                 // Try to obtain the multitrack associated to the tractor
 258                 mlt_multitrack multitrack = mlt_properties_get_data( properties, "multitrack", NULL );
 259
 260                 // Or a specific producer
 261                 mlt_producer producer = mlt_properties_get_data( properties, "producer", NULL );
 262
 263                 // If we don't have one, we're in trouble...
 264                 if ( multitrack != NULL )
 265                 {
 266                         // Used to garbage collect all frames
 267                         char label[ 30 ];
 268
 269                         // Get the id of the tractor
 270                         char *id = mlt_properties_get( properties, "_unique_id" );
 271
 272                         // Will be used to store the frame properties object
 273                         mlt_properties frame_properties = NULL;
 274
 275                         // We'll store audio and video frames to use here
 276                         mlt_frame audio = NULL;
 277                         mlt_frame video = NULL;
 278
 279                         // Determine which data_queue to pass on...
 280                         void *data_queue = NULL;
 281
 282                         // Temporary properties
 283                         mlt_properties temp_properties = NULL;
 284
 285                         // Get the multitrack's producer
 286                         mlt_producer target = MLT_MULTITRACK_PRODUCER( multitrack );
 287                         mlt_producer_seek( target, mlt_producer_frame( parent ) );
 288                         mlt_producer_set_speed( target, mlt_producer_get_speed( parent ) );
 289
 290                         // We will create one frame and attach everything to it
 291                         *frame = mlt_frame_init( );
 292
 293                         // Get the properties of the frame
 294                         frame_properties = MLT_FRAME_PROPERTIES( *frame );
 295
 296                         // Loop through each of the tracks we're harvesting
 297                         for ( i = 0; !done; i ++ )
 298                         {
 299                                 // Get a frame from the producer
 300                                 mlt_service_get_frame( this->producer, &temp, i );
 301
 302                                 // Get the temporary properties
 303                                 temp_properties = MLT_FRAME_PROPERTIES( temp );
 304
 305                                 // Check for last track
 306                                 done = mlt_properties_get_int( temp_properties, "last_track" );
 307
 308                                 // We store all frames with a destructor on the output frame
 309                                 sprintf( label, "_%s_%d", id, count ++ );
 310                                 mlt_properties_set_data( frame_properties, label, temp, 0, ( mlt_destructor )mlt_frame_close, NULL );
 311
 312                                 // We want the last data_queue
 313                                 if ( !done && mlt_properties_get_data( temp_properties, "data_queue", NULL ) != NULL &&
 314                                      mlt_deque_count( mlt_properties_get_data( temp_properties, "data_queue", NULL ) ) != 0 )
 315                                         data_queue = mlt_properties_get_data( MLT_FRAME_PROPERTIES( temp ), "data_queue", NULL );
 316
 317                                 // Pick up first video and audio frames
 318                                 if ( !done && !mlt_frame_is_test_audio( temp ) && !( mlt_properties_get_int( temp_properties, "hide" ) & 2 ) )
 319                                         audio = temp;
 320                                 if ( !done && !mlt_frame_is_test_card( temp ) && !( mlt_properties_get_int( temp_properties, "hide" ) & 1 ) )
 321                                         video = temp;
 322                         }
 323
 324                         // Now stack callbacks
 325                         if ( audio != NULL )
 326                         {
 327                                 mlt_frame_push_audio( *frame, audio );
 328                                 ( *frame )->get_audio = producer_get_audio;
 329                         }
 330
 331                         if ( video != NULL )
 332                         {
 333                                 mlt_properties video_properties = MLT_FRAME_PROPERTIES( video );
 334                                 mlt_frame_push_service( *frame, video );
 335                                 mlt_frame_push_service( *frame, producer_get_image );
 336                                 mlt_properties_set_data( frame_properties, "data_queue", data_queue, 0, NULL, NULL );
 337                                 mlt_properties_set_int( frame_properties, "width", mlt_properties_get_int( video_properties, "width" ) );
 338                                 mlt_properties_set_int( frame_properties, "height", mlt_properties_get_int( video_properties, "height" ) );
 339                                 mlt_properties_set_int( frame_properties, "real_width", mlt_properties_get_int( video_properties, "real_width" ) );
 340                                 mlt_properties_set_int( frame_properties, "real_height", mlt_properties_get_int( video_properties, "real_height" ) );
 341                                 mlt_properties_set_int( frame_properties, "progressive", mlt_properties_get_int( video_properties, "progressive" ) );
 342                                 mlt_properties_set_double( frame_properties, "aspect_ratio", mlt_properties_get_double( video_properties, "aspect_ratio" ) );
 343                         }
 344
 345                         mlt_frame_set_position( *frame, mlt_producer_frame( parent ) );
 346                         mlt_properties_set_int( MLT_FRAME_PROPERTIES( *frame ), "test_audio", audio == NULL );
 347                         mlt_properties_set_int( MLT_FRAME_PROPERTIES( *frame ), "test_image", video == NULL );
 348                 }
 349                 else if ( producer != NULL )
 350                 {
 351                         mlt_producer_seek( producer, mlt_producer_frame( parent ) );
 352                         mlt_producer_set_speed( producer, mlt_producer_get_speed( parent ) );
 353                         mlt_service_get_frame( this->producer, frame, track );
 354                 }
 355                 else
 356                 {
 357                         fprintf( stderr, "tractor without a multitrack!!\n" );
 358                         mlt_service_get_frame( this->producer, frame, track );
 359                 }
 360
 361                 // Prepare the next frame
 362                 mlt_producer_prepare_next( parent );
 363
 364                 // Indicate our found status
 365                 return 0;
 366         }
 367         else
 368         {
 369                 // Generate a test card
 370                 *frame = mlt_frame_init( );
 371                 return 0;
 372         }
 373 }
 374
 375 /** Close the tractor.
 376 */
 377
 378 void mlt_tractor_close( mlt_tractor this )
 379 {
 380         if ( this != NULL && mlt_properties_dec_ref( MLT_TRACTOR_PROPERTIES( this ) ) <= 0 )
 381         {
 382                 this->parent.close = NULL;
 383                 mlt_producer_close( &this->parent );
 384                 free( this );
 385         }
 386 }
 387