git.sesse.net Git - mlt/blob - src/modules/core/producer_loader.c

   1 /*
   2  * producer_loader.c -- auto-load producer by file name extension
   3  * Copyright (C) 2003-2009 Ushodaya Enterprises Limited
   4  * Author: Charles Yates <charles.yates@pandora.be>
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library 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 GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <ctype.h>
  25 #include <fnmatch.h>
  26 #include <assert.h>
  27
  28 #include <framework/mlt.h>
  29
  30 static mlt_properties dictionary = NULL;
  31 static mlt_properties normalisers = NULL;
  32
  33 static mlt_producer create_from( mlt_profile profile, char *file, char *services )
  34 {
  35         mlt_producer producer = NULL;
  36         char *temp = strdup( services );
  37         char *service = temp;
  38         do
  39         {
  40                 char *p = strchr( service, ',' );
  41                 if ( p != NULL )
  42                         *p ++ = '\0';
  43                 producer = mlt_factory_producer( profile, service, file );
  44                 service = p;
  45         }
  46         while ( producer == NULL && service != NULL );
  47         free( temp );
  48         return producer;
  49 }
  50
  51 static mlt_producer create_producer( mlt_profile profile, char *file )
  52 {
  53         mlt_producer result = NULL;
  54
  55         // 1st Line - check for service:resource handling
  56         // And ignore drive letters on Win32 - no single char services supported.
  57         if ( strchr( file, ':' ) > file + 1 )
  58         {
  59                 char *temp = strdup( file );
  60                 char *service = temp;
  61                 char *resource = strchr( temp, ':' );
  62                 *resource ++ = '\0';
  63                 result = mlt_factory_producer( profile, service, resource );
  64                 free( temp );
  65         }
  66
  67         // 2nd Line preferences
  68         if ( result == NULL )
  69         {
  70                 int i = 0;
  71                 char *lookup = strdup( file );
  72                 char *p = lookup;
  73
  74                 // Make backup of profile for determining if we need to use 'consumer' producer.
  75                 mlt_profile backup_profile = mlt_profile_clone( profile );
  76
  77                 // We only need to load the dictionary once
  78                 if ( dictionary == NULL )
  79                 {
  80                         char temp[ 1024 ];
  81                         sprintf( temp, "%s/core/loader.dict", mlt_environment( "MLT_DATA" ) );
  82                         dictionary = mlt_properties_load( temp );
  83                         mlt_factory_register_for_clean_up( dictionary, ( mlt_destructor )mlt_properties_close );
  84                 }
  85
  86                 // Convert the lookup string to lower case
  87                 while ( *p )
  88                 {
  89                         *p = tolower( *p );
  90                         p ++;
  91                 }
  92
  93                 // Strip file:// prefix
  94                 p = lookup;
  95                 if ( strncmp( lookup, "file://", 7 ) == 0 )
  96                         p += 7;
  97
  98                 // Iterate through the dictionary
  99                 for ( i = 0; result == NULL && i < mlt_properties_count( dictionary ); i ++ )
 100                 {
 101                         char *name = mlt_properties_get_name( dictionary, i );
 102                         if ( fnmatch( name, p, 0 ) == 0 )
 103                                 result = create_from( profile, file, mlt_properties_get_value( dictionary, i ) );
 104                 }
 105
 106                 // Check if the producer changed the profile - xml does this.
 107                 // The consumer producer does not handle frame rate differences.
 108                 if ( result && backup_profile->is_explicit && (
 109                      profile->width != backup_profile->width ||
 110                      profile->height != backup_profile->height ||
 111                      profile->sample_aspect_num != backup_profile->sample_aspect_num ||
 112                      profile->sample_aspect_den != backup_profile->sample_aspect_den ||
 113                      profile->colorspace != backup_profile->colorspace ) )
 114                 {
 115                         // Restore the original profile attributes.
 116                         profile->display_aspect_den = backup_profile->display_aspect_den;
 117                         profile->display_aspect_num = backup_profile->display_aspect_num;
 118                         profile->frame_rate_den = backup_profile->frame_rate_den;
 119                         profile->frame_rate_num = backup_profile->frame_rate_num;
 120                         profile->height = backup_profile->height;
 121                         profile->progressive = backup_profile->progressive;
 122                         profile->sample_aspect_den = backup_profile->sample_aspect_den;
 123                         profile->sample_aspect_num = backup_profile->sample_aspect_num;
 124                         profile->width = backup_profile->width;
 125
 126                         // Use the 'consumer' producer.
 127                         mlt_producer_close( result );
 128                         result = mlt_factory_producer( profile, "consumer", file );
 129                 }
 130
 131                 mlt_profile_close( backup_profile );
 132                 free( lookup );
 133         }
 134
 135         // Finally, try just loading as service
 136         if ( result == NULL )
 137                 result = mlt_factory_producer( profile, file, NULL );
 138
 139         return result;
 140 }
 141
 142 static void create_filter( mlt_profile profile, mlt_producer producer, char *effect, int *created )
 143 {
 144         char *id = strdup( effect );
 145         char *arg = strchr( id, ':' );
 146         if ( arg != NULL )
 147                 *arg ++ = '\0';
 148
 149         // The swscale and avcolor_space filters require resolution as arg to test compatibility
 150         if ( strncmp( effect, "swscale", 7 ) == 0 || strncmp( effect, "avcolo", 6 ) == 0 )
 151                 arg = (char*) mlt_properties_get_int( MLT_PRODUCER_PROPERTIES( producer ), "meta.media.width" );
 152
 153         mlt_filter filter = mlt_factory_filter( profile, id, arg );
 154         if ( filter != NULL )
 155         {
 156                 mlt_properties_set_int( MLT_FILTER_PROPERTIES( filter ), "_loader", 1 );
 157                 mlt_producer_attach( producer, filter );
 158                 mlt_filter_close( filter );
 159                 *created = 1;
 160         }
 161         free( id );
 162 }
 163
 164 static void attach_normalisers( mlt_profile profile, mlt_producer producer )
 165 {
 166         // Loop variable
 167         int i;
 168
 169         // Tokeniser
 170         mlt_tokeniser tokeniser = mlt_tokeniser_init( );
 171
 172         // We only need to load the normalising properties once
 173         if ( normalisers == NULL )
 174         {
 175                 char temp[ 1024 ];
 176                 sprintf( temp, "%s/core/loader.ini", mlt_environment( "MLT_DATA" ) );
 177                 normalisers = mlt_properties_load( temp );
 178                 mlt_factory_register_for_clean_up( normalisers, ( mlt_destructor )mlt_properties_close );
 179         }
 180
 181         // Apply normalisers
 182         for ( i = 0; i < mlt_properties_count( normalisers ); i ++ )
 183         {
 184                 int j = 0;
 185                 int created = 0;
 186                 char *value = mlt_properties_get_value( normalisers, i );
 187                 mlt_tokeniser_parse_new( tokeniser, value, "," );
 188                 for ( j = 0; !created && j < mlt_tokeniser_count( tokeniser ); j ++ )
 189                         create_filter( profile, producer, mlt_tokeniser_get_string( tokeniser, j ), &created );
 190         }
 191
 192         // Close the tokeniser
 193         mlt_tokeniser_close( tokeniser );
 194 }
 195
 196 mlt_producer producer_loader_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg )
 197 {
 198         // Create the producer
 199         mlt_producer producer = NULL;
 200         mlt_properties properties = NULL;
 201
 202         if ( arg != NULL )
 203                 producer = create_producer( profile, arg );
 204
 205         if ( producer != NULL )
 206                 properties = MLT_PRODUCER_PROPERTIES( producer );
 207
 208         // Attach filters if we have a producer and it isn't already xml'd :-)
 209         if ( producer && strcmp( id, "abnormal" ) &&
 210                 strncmp( arg, "abnormal:", 9 ) &&
 211                 mlt_properties_get( properties, "xml" ) == NULL &&
 212                 mlt_properties_get( properties, "_xml" ) == NULL &&
 213                 mlt_properties_get( properties, "loader_normalised" ) == NULL )
 214                 attach_normalisers( profile, producer );
 215
 216         if ( producer )
 217         {
 218                 // Always let the image and audio be converted
 219                 int created = 0;
 220                 create_filter( profile, producer, "avcolor_space", &created );
 221                 if ( !created )
 222                         create_filter( profile, producer, "imageconvert", &created );
 223                 create_filter( profile, producer, "audioconvert", &created );
 224         }
 225
 226         // Now make sure we don't lose our identity
 227         if ( properties != NULL )
 228                 mlt_properties_set_int( properties, "_mlt_service_hidden", 1 );
 229
 230         // Return the producer
 231         return producer;
 232 }