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 /** Private structure.
  33 */
  34
  35 struct mlt_tractor_s
  36 {
  37         struct mlt_producer_s parent;
  38         mlt_service producer;
  39 };
  40
  41 /** Forward references to static methods.
  42 */
  43
  44 static int producer_get_frame( mlt_producer this, mlt_frame_ptr frame, int track );
  45 static void mlt_tractor_listener( mlt_multitrack tracks, mlt_tractor this );
  46
  47 /** Constructor for the tractor.
  48 */
  49
  50 mlt_tractor mlt_tractor_init( )
  51 {
  52         mlt_tractor this = calloc( sizeof( struct mlt_tractor_s ), 1 );
  53         if ( this != NULL )
  54         {
  55                 mlt_producer producer = &this->parent;
  56                 if ( mlt_producer_init( producer, this ) == 0 )
  57                 {
  58                         mlt_properties_set( mlt_producer_properties( producer ), "resource", "<tractor>" );
  59                         mlt_properties_set( mlt_producer_properties( producer ), "mlt_type", "mlt_producer" );
  60                         mlt_properties_set( mlt_producer_properties( producer ), "mlt_service", "tractor" );
  61
  62                         producer->get_frame = producer_get_frame;
  63                         producer->close = ( mlt_destructor )mlt_tractor_close;
  64                         producer->close_object = this;
  65                 }
  66                 else
  67                 {
  68                         free( this );
  69                         this = NULL;
  70                 }
  71         }
  72         return this;
  73 }
  74
  75 mlt_tractor mlt_tractor_new( )
  76 {
  77         mlt_tractor this = calloc( sizeof( struct mlt_tractor_s ), 1 );
  78         if ( this != NULL )
  79         {
  80                 mlt_producer producer = &this->parent;
  81                 if ( mlt_producer_init( producer, this ) == 0 )
  82                 {
  83                         mlt_multitrack multitrack = mlt_multitrack_init( );
  84                         mlt_field field = mlt_field_new( multitrack, this );
  85                         mlt_properties props = mlt_producer_properties( producer );
  86
  87                         mlt_properties_set( props, "resource", "<tractor>" );
  88                         mlt_properties_set( props, "mlt_type", "mlt_producer" );
  89                         mlt_properties_set( props, "mlt_service", "tractor" );
  90                         mlt_properties_set_position( props, "in", 0 );
  91                         mlt_properties_set_position( props, "out", 0 );
  92                         mlt_properties_set_position( props, "length", 0 );
  93                         mlt_properties_set_data( props, "multitrack", multitrack, 0, ( mlt_destructor )mlt_multitrack_close, NULL );
  94                         mlt_properties_set_data( props, "field", field, 0, ( mlt_destructor )mlt_field_close, NULL );
  95
  96                         mlt_events_listen( mlt_multitrack_properties( multitrack ), this, "producer-changed", ( mlt_listener )mlt_tractor_listener );
  97
  98                         producer->get_frame = producer_get_frame;
  99                         producer->close = ( mlt_destructor )mlt_tractor_close;
 100                         producer->close_object = this;
 101                 }
 102                 else
 103                 {
 104                         free( this );
 105                         this = NULL;
 106                 }
 107         }
 108         return this;
 109 }
 110
 111 /** Get the service object associated to the tractor.
 112 */
 113
 114 mlt_service mlt_tractor_service( mlt_tractor this )
 115 {
 116         return mlt_producer_service( &this->parent );
 117 }
 118
 119 /** Get the producer object associated to the tractor.
 120 */
 121
 122 mlt_producer mlt_tractor_producer( mlt_tractor this )
 123 {
 124         return this != NULL ? &this->parent : NULL;
 125 }
 126
 127 /** Get the properties object associated to the tractor.
 128 */
 129
 130 mlt_properties mlt_tractor_properties( mlt_tractor this )
 131 {
 132         return mlt_producer_properties( &this->parent );
 133 }
 134
 135 /** Get the field this tractor is harvesting.
 136 */
 137
 138 mlt_field mlt_tractor_field( mlt_tractor this )
 139 {
 140         return mlt_properties_get_data( mlt_tractor_properties( this ), "field", NULL );
 141 }
 142
 143 /** Get the multitrack this tractor is pulling.
 144 */
 145
 146 mlt_multitrack mlt_tractor_multitrack( mlt_tractor this )
 147 {
 148         return mlt_properties_get_data( mlt_tractor_properties( this ), "multitrack", NULL );
 149 }
 150
 151 /** Ensure the tractors in/out points match the multitrack.
 152 */
 153
 154 void mlt_tractor_refresh( mlt_tractor this )
 155 {
 156         mlt_multitrack multitrack = mlt_tractor_multitrack( this );
 157         mlt_properties properties = mlt_multitrack_properties( multitrack );
 158         mlt_properties self = mlt_tractor_properties( this );
 159         mlt_events_block( properties, self );
 160         mlt_events_block( self, self );
 161         mlt_multitrack_refresh( multitrack );
 162         mlt_properties_set_position( self, "in", 0 );
 163         mlt_properties_set_position( self, "out", mlt_properties_get_position( properties, "out" ) );
 164         mlt_events_unblock( self, self );
 165         mlt_events_unblock( properties, self );
 166         mlt_properties_set_position( self, "length", mlt_properties_get_position( properties, "length" ) );
 167 }
 168
 169 static void mlt_tractor_listener( mlt_multitrack tracks, mlt_tractor this )
 170 {
 171         mlt_tractor_refresh( this );
 172 }
 173
 174 /** Connect the tractor.
 175 */
 176
 177 int mlt_tractor_connect( mlt_tractor this, mlt_service producer )
 178 {
 179         int ret = mlt_service_connect_producer( mlt_tractor_service( this ), producer, 0 );
 180
 181         // This is the producer we're going to connect to
 182         if ( ret == 0 )
 183                 this->producer = producer;
 184
 185         return ret;
 186 }
 187
 188 /** Set the producer for a specific track.
 189 */
 190
 191 int mlt_tractor_set_track( mlt_tractor this, mlt_producer producer, int index )
 192 {
 193         return mlt_multitrack_connect( mlt_tractor_multitrack( this ), producer, index );
 194 }
 195
 196 /** Get the producer for a specific track.
 197 */
 198
 199 mlt_producer mlt_tractor_get_track( mlt_tractor this, int index )
 200 {
 201         return mlt_multitrack_track( mlt_tractor_multitrack( this ), index );
 202 }
 203
 204 static uint8_t *mlt_tractor_alpha_mask( mlt_frame frame )
 205 {
 206         return mlt_properties_get_data( mlt_frame_properties( frame ), "alpha", NULL );
 207 }
 208
 209 static int producer_get_image( mlt_frame this, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
 210 {
 211         uint8_t *data = NULL;
 212         mlt_properties properties = mlt_frame_properties( this );
 213         mlt_frame frame = mlt_frame_pop_service( this );
 214         mlt_properties_inherit( mlt_frame_properties( frame ), properties );
 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         data = mlt_frame_get_alpha_mask( frame );
 221         mlt_properties_set_data( properties, "alpha", data, 0, NULL, NULL );
 222         this->get_alpha_mask = mlt_tractor_alpha_mask;
 223         return 0;
 224 }
 225
 226 static int producer_get_audio( mlt_frame this, int16_t **buffer, mlt_audio_format *format, int *frequency, int *channels, int *samples )
 227 {
 228         mlt_properties properties = mlt_frame_properties( this );
 229         mlt_frame frame = mlt_frame_pop_audio( this );
 230         mlt_properties_inherit( mlt_frame_properties( frame ), properties );
 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 /** Get the next frame.
 239 */
 240
 241 static int producer_get_frame( mlt_producer parent, mlt_frame_ptr frame, int track )
 242 {
 243         mlt_tractor this = parent->child;
 244
 245         // We only respond to the first track requests
 246         if ( track == 0 && this->producer != NULL )
 247         {
 248                 int i = 0;
 249                 int done = 0;
 250                 mlt_frame temp = NULL;
 251                 int count = 0;
 252
 253                 // Get the properties of the parent producer
 254                 mlt_properties properties = mlt_producer_properties( parent );
 255
 256                 // Try to obtain the multitrack associated to the tractor
 257                 mlt_multitrack multitrack = mlt_properties_get_data( properties, "multitrack", NULL );
 258
 259                 // Or a specific producer
 260                 mlt_producer producer = mlt_properties_get_data( properties, "producer", NULL );
 261
 262                 // If we don't have one, we're in trouble...
 263                 if ( multitrack != NULL )
 264                 {
 265                         // Used to garbage collect all frames
 266                         char label[ 30 ];
 267
 268                         // Get the id of the tractor
 269                         char *id = mlt_properties_get( properties, "_unique_id" );
 270
 271                         // Will be used to store the frame properties object
 272                         mlt_properties frame_properties = NULL;
 273
 274                         // We'll store audio and video frames to use here
 275                         mlt_frame audio = NULL;
 276                         mlt_frame video = NULL;
 277
 278                         // Determine which data_queue to pass on...
 279                         void *data_queue = NULL;
 280
 281                         // Get the multitrack's producer
 282                         mlt_producer target = mlt_multitrack_producer( multitrack );
 283                         mlt_producer_seek( target, mlt_producer_frame( parent ) );
 284                         mlt_producer_set_speed( target, mlt_producer_get_speed( parent ) );
 285
 286                         // We will create one frame and attach everything to it
 287                         *frame = mlt_frame_init( );
 288
 289                         // Get the properties of the frame
 290                         frame_properties = mlt_frame_properties( *frame );
 291
 292                         // Loop through each of the tracks we're harvesting
 293                         for ( i = 0; !done; i ++ )
 294                         {
 295                                 // Get a frame from the producer
 296                                 mlt_service_get_frame( this->producer, &temp, i );
 297
 298                                 // Check for last track
 299                                 done = mlt_properties_get_int( mlt_frame_properties( temp ), "last_track" );
 300
 301                                 // We store all frames with a destructor on the output frame
 302                                 sprintf( label, "_%s_%d", id, count ++ );
 303                                 mlt_properties_set_data( frame_properties, label, temp, 0, ( mlt_destructor )mlt_frame_close, NULL );
 304
 305                                 // We want the last data_queue
 306                                 if ( mlt_properties_get_data( mlt_frame_properties( temp ), "data_queue", NULL ) != NULL )
 307                                         data_queue = mlt_properties_get_data( mlt_frame_properties( temp ), "data_queue", NULL );
 308
 309                                 // Pick up first video and audio frames
 310                                 if ( !done && !mlt_frame_is_test_audio( temp ) && !( mlt_properties_get_int( mlt_frame_properties( temp ), "hide" ) & 2 ) )
 311                                         audio = temp;
 312                                 if ( !done && !mlt_frame_is_test_card( temp ) && !( mlt_properties_get_int( mlt_frame_properties( temp ), "hide" ) & 1 ) )
 313                                         video = temp;
 314                         }
 315
 316                         // Now stack callbacks
 317                         if ( audio != NULL )
 318                         {
 319                                 mlt_frame_push_audio( *frame, audio );
 320                                 ( *frame )->get_audio = producer_get_audio;
 321                                 mlt_properties_inherit( mlt_frame_properties( *frame ), mlt_frame_properties( audio ) );
 322                         }
 323
 324                         if ( video != NULL )
 325                         {
 326                                 mlt_properties_set_data( mlt_frame_properties( *frame ), "data_queue", data_queue, 0, NULL, NULL );
 327                                 mlt_frame_push_service( *frame, video );
 328                                 mlt_frame_push_service( *frame, producer_get_image );
 329                                 mlt_properties_inherit( mlt_frame_properties( *frame ), mlt_frame_properties( video ) );
 330                         }
 331
 332                         mlt_properties_set_int( mlt_frame_properties( *frame ), "test_audio", audio == NULL );
 333                         mlt_properties_set_int( mlt_frame_properties( *frame ), "test_image", video == NULL );
 334                 }
 335                 else if ( producer != NULL )
 336                 {
 337                         mlt_producer_seek( producer, mlt_producer_frame( parent ) );
 338                         mlt_producer_set_speed( producer, mlt_producer_get_speed( parent ) );
 339                         mlt_service_get_frame( this->producer, frame, track );
 340                 }
 341                 else
 342                 {
 343                         fprintf( stderr, "tractor without a multitrack!!\n" );
 344                         mlt_service_get_frame( this->producer, frame, track );
 345                 }
 346
 347                 // Prepare the next frame
 348                 mlt_producer_prepare_next( parent );
 349
 350                 // Indicate our found status
 351                 return 0;
 352         }
 353         else
 354         {
 355                 // Generate a test card
 356                 *frame = mlt_frame_init( );
 357                 return 0;
 358         }
 359 }
 360
 361 /** Close the tractor.
 362 */
 363
 364 void mlt_tractor_close( mlt_tractor this )
 365 {
 366         if ( this != NULL && mlt_properties_dec_ref( mlt_tractor_properties( this ) ) <= 0 )
 367         {
 368                 this->parent.close = NULL;
 369                 mlt_producer_close( &this->parent );
 370                 free( this );
 371         }
 372 }
 373