research.m1stereo.tv/gitweb/ - melted/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
  30 /** Public final methods
  31 */
  32
  33 int mlt_consumer_init( mlt_consumer this, void *child )
  34 {
  35         int error = 0;
  36         memset( this, 0, sizeof( struct mlt_consumer_s ) );
  37         this->child = child;
  38         error = mlt_service_init( &this->parent, this );
  39         if ( error == 0 )
  40         {
  41                 // Get the properties from the service
  42                 mlt_properties properties = mlt_service_properties( &this->parent );
  43
  44                 // Get the normalisation preference
  45                 char *normalisation = mlt_environment( "MLT_NORMALISATION" );
  46
  47                 // Deal with normalisation
  48                 if ( normalisation == NULL || strcmp( normalisation, "NTSC" ) )
  49                 {
  50                         mlt_properties_set( properties, "normalisation", "PAL" );
  51                         mlt_properties_set_double( properties, "fps", 25.0 );
  52                         mlt_properties_set_int( properties, "width", 720 );
  53                         mlt_properties_set_int( properties, "height", 576 );
  54                         mlt_properties_set_int( properties, "progressive", 0 );
  55                 }
  56                 else
  57                 {
  58                         mlt_properties_set( properties, "normalisation", "NTSC" );
  59                         mlt_properties_set_double( properties, "fps", 30000.0 / 1001.0 );
  60                         mlt_properties_set_int( properties, "width", 720 );
  61                         mlt_properties_set_int( properties, "height", 480 );
  62                         mlt_properties_set_int( properties, "progressive", 0 );
  63                 }
  64                 mlt_properties_set_double( properties, "aspect_ratio", 4.0 / 3.0 );
  65
  66                 // Default rescaler for all consumers
  67                 mlt_properties_set( properties, "rescale", "bilinear" );
  68         }
  69         return error;
  70 }
  71
  72 /** Get the parent service object.
  73 */
  74
  75 mlt_service mlt_consumer_service( mlt_consumer this )
  76 {
  77         return &this->parent;
  78 }
  79
  80 /** Get the consumer properties.
  81 */
  82
  83 mlt_properties mlt_consumer_properties( mlt_consumer this )
  84 {
  85         return mlt_service_properties( &this->parent );
  86 }
  87
  88 /** Connect the consumer to the producer.
  89 */
  90
  91 int mlt_consumer_connect( mlt_consumer this, mlt_service producer )
  92 {
  93         return mlt_service_connect_producer( &this->parent, producer, 0 );
  94 }
  95
  96 /** Start the consumer.
  97 */
  98
  99 int mlt_consumer_start( mlt_consumer this )
 100 {
 101         // Get the properies
 102         mlt_properties properties = mlt_consumer_properties( this );
 103
 104         // Determine if there's a test card producer
 105         char *test_card = mlt_properties_get( properties, "test_card" );
 106
 107         // Deal with it now.
 108         if ( test_card != NULL )
 109         {
 110                 if ( mlt_properties_get_data( properties, "test_card_producer", NULL ) == NULL )
 111                 {
 112                         // Create a test card producer
 113                         // TODO: do we want to use fezzik here?
 114                         mlt_producer producer = mlt_factory_producer( "fezzik", test_card );
 115
 116                         // Do we have a producer
 117                         if ( producer != NULL )
 118                         {
 119                                 // Test card should loop I guess...
 120                                 mlt_properties_set( mlt_producer_properties( producer ), "eof", "loop" );
 121
 122                                 // Set the test card on the consumer
 123                                 mlt_properties_set_data( properties, "test_card_producer", producer, 0, ( mlt_destructor )mlt_producer_close, NULL );
 124                         }
 125
 126                         // Check and run an ante command
 127                         if ( mlt_properties_get( properties, "ante" ) )
 128                                 system( mlt_properties_get( properties, "ante" ) );
 129                 }
 130         }
 131         else
 132         {
 133                 // Allow the hash table to speed things up
 134                 mlt_properties_set_data( properties, "test_card_producer", NULL, 0, NULL, NULL );
 135         }
 136
 137         // Start the service
 138         if ( this->start != NULL )
 139                 return this->start( this );
 140
 141         return 0;
 142 }
 143
 144 /** Protected method :-/ for consumer to get frames from connected service
 145 */
 146
 147 mlt_frame mlt_consumer_get_frame( mlt_consumer this )
 148 {
 149         // Frame to return
 150         mlt_frame frame = NULL;
 151
 152         // Get the service assoicated to the consumer
 153         mlt_service service = mlt_consumer_service( this );
 154
 155         // Get the frame
 156         if ( mlt_service_get_frame( service, &frame, 0 ) == 0 )
 157         {
 158                 // Get the consumer properties
 159                 mlt_properties properties = mlt_consumer_properties( this );
 160
 161                 // Get the frame properties
 162                 mlt_properties frame_properties = mlt_frame_properties( frame );
 163
 164                 // Get the test card producer
 165                 mlt_producer test_card = mlt_properties_get_data( properties, "test_card_producer", NULL );
 166
 167                 // Attach the test frame producer to it.
 168                 if ( test_card != NULL )
 169                         mlt_properties_set_data( frame_properties, "test_card_producer", test_card, 0, NULL, NULL );
 170
 171                 // Attach the rescale property
 172                 mlt_properties_set( frame_properties, "rescale.interp", mlt_properties_get( properties, "rescale" ) );
 173
 174                 // Aspect ratio and other jiggery pokery
 175                 mlt_properties_set_double( frame_properties, "consumer_aspect_ratio", mlt_properties_get_double( properties, "aspect_ratio" ) );
 176                 mlt_properties_set_int( frame_properties, "consumer_progressive", mlt_properties_get_int( properties, "progressive" ) );
 177                 mlt_properties_set_int( frame_properties, "consumer_deinterlace", mlt_properties_get_int( properties, "deinterlace" ) );
 178         }
 179
 180         // Return the frame
 181         return frame;
 182 }
 183
 184 /** Stop the consumer.
 185 */
 186
 187 int mlt_consumer_stop( mlt_consumer this )
 188 {
 189         // Get the properies
 190         mlt_properties properties = mlt_consumer_properties( this );
 191
 192         // Stop the consumer
 193         if ( this->stop != NULL )
 194                 this->stop( this );
 195
 196         // Kill the test card
 197         mlt_properties_set_data( properties, "test_card_producer", NULL, 0, NULL, NULL );
 198
 199         // Check and run a post command
 200         if ( mlt_properties_get( properties, "post" ) )
 201                 system( mlt_properties_get( properties, "post" ) );
 202
 203         return 0;
 204 }
 205
 206 /** Determine if the consumer is stopped.
 207 */
 208
 209 int mlt_consumer_is_stopped( mlt_consumer this )
 210 {
 211         // Check if the consumer is stopped
 212         if ( this->is_stopped != NULL )
 213                 return this->is_stopped( this );
 214
 215         return 0;
 216 }
 217
 218 /** Close the consumer.
 219 */
 220
 221 void mlt_consumer_close( mlt_consumer this )
 222 {
 223         // Get the childs close function
 224         void ( *consumer_close )( ) = this->close;
 225
 226         // Make sure it only gets called once
 227         this->close = NULL;
 228
 229         // Call the childs close if available
 230         if ( consumer_close != NULL )
 231                 consumer_close( this );
 232         else
 233                 mlt_service_close( &this->parent );
 234 }
 235