research.m1stereo.tv/gitweb/ - melted/blob - src/framework/mlt_profile.c

   1 /*
   2  * mlt_profile.c -- video output definition
   3  * Copyright (C) 2007 Ushodaya Enterprises Limited
   4  * Author: Dan Dennedy <dan@dennedy.org>
   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 "mlt_profile.h"
  22 #include "mlt_factory.h"
  23 #include "mlt_properties.h"
  24
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #include <libgen.h>
  28
  29 #define PROFILES_DIR "/share/mlt/profiles/"
  30
  31 static mlt_profile profile = NULL;
  32
  33 /** Get the current profile
  34 * Builds one for PAL DV if non-existing
  35 */
  36
  37 mlt_profile mlt_profile_get( )
  38 {
  39         if ( !profile )
  40         {
  41                 profile = calloc( 1, sizeof( struct mlt_profile_s ) );
  42                 if ( profile )
  43                 {
  44                         mlt_environment_set( "MLT_PROFILE", "dv_pal" );
  45                         profile->description = strdup( "PAL 4:3 DV or DVD" );
  46                         profile->frame_rate_num = 25;
  47                         profile->frame_rate_den = 1;
  48                         profile->width = 720;
  49                         profile->height = 576;
  50                         profile->progressive = 0;
  51                         profile->sample_aspect_num = 59;
  52                         profile->sample_aspect_den = 54;
  53                         profile->display_aspect_num = 4;
  54                         profile->display_aspect_den = 3;
  55                 }
  56         }
  57         return profile;
  58 }
  59
  60
  61 /** Load a profile from the system folder
  62 */
  63
  64 mlt_profile mlt_profile_select( const char *name )
  65 {
  66         char *filename = NULL;
  67         const char *prefix = getenv( "MLT_PROFILES_PATH" );
  68
  69         // Allow environment to override default behavior
  70         if ( prefix == NULL )
  71         {
  72                 // default behavior is to use $prefix/share/mlt/profiles
  73                 prefix = PREFIX;
  74                 filename = calloc( 1, strlen( prefix ) + strlen( PROFILES_DIR ) + strlen( name ) + 2 );
  75                 strcpy( filename, prefix );
  76                 if ( filename[ strlen( filename ) - 1 ] != '/' )
  77                         filename[ strlen( filename ) ] = '/';
  78                 strcat( filename, PROFILES_DIR );
  79         }
  80         else
  81         {
  82                 // just use environment variable
  83                 filename = calloc( 1, strlen( prefix ) + strlen( name ) + 2 );
  84                 strcpy( filename, prefix );
  85                 if ( filename[ strlen( filename ) - 1 ] != '/' )
  86                         filename[ strlen( filename ) ] = '/';
  87         }
  88         strcat( filename, name );
  89         return mlt_profile_load_file( filename );
  90 }
  91
  92 /** Load a profile from specific file
  93 */
  94
  95 mlt_profile mlt_profile_load_file( const char *file )
  96 {
  97         // Load the profile as properties
  98         mlt_properties properties = mlt_properties_load( file );
  99         if ( properties && mlt_properties_get_int( properties, "width" ) )
 100         {
 101                 mlt_profile_load_properties( properties );
 102                 mlt_properties_close( properties );
 103
 104                 // Set MLT_PROFILE to basename
 105                 char *filename = strdup( file );
 106                 mlt_environment_set( "MLT_PROFILE", basename( filename ) );
 107                 free( filename );
 108         }
 109         else
 110         {
 111                 // Cleanup
 112                 mlt_properties_close( properties );
 113                 mlt_profile_close();
 114                 // Failover
 115                 mlt_profile_get();
 116         }
 117
 118         // Set MLT_NORMALISATION to appease legacy modules
 119         char *profile_name = mlt_environment( "MLT_PROFILE" );
 120         if ( strstr( profile_name, "_ntsc" ) ||
 121              strstr( profile_name, "_60" ) ||
 122              strstr( profile_name, "_30" ) )
 123         {
 124                 mlt_environment_set( "MLT_NORMALISATION", "NTSC" );
 125         }
 126         else if ( strstr( profile_name, "_pal" ) ||
 127                   strstr( profile_name, "_50" ) ||
 128                   strstr( profile_name, "_25" ) )
 129         {
 130                 mlt_environment_set( "MLT_NORMALISATION", "PAL" );
 131         }
 132
 133         return profile;
 134 }
 135
 136 /** Load a profile from a properties object
 137 */
 138
 139 mlt_profile mlt_profile_load_properties( mlt_properties properties )
 140 {
 141         mlt_profile_close();
 142         profile = calloc( 1, sizeof( struct mlt_profile_s ) );
 143         if ( profile )
 144         {
 145                 if ( mlt_properties_get( properties, "name" ) )
 146                         mlt_environment_set( "MLT_PROFILE", mlt_properties_get( properties, "name" ) );
 147                 if ( mlt_properties_get( properties, "description" ) )
 148                         profile->description = strdup( mlt_properties_get( properties, "description" ) );
 149                 profile->frame_rate_num = mlt_properties_get_int( properties, "frame_rate_num" );
 150                 profile->frame_rate_den = mlt_properties_get_int( properties, "frame_rate_den" );
 151                 profile->width = mlt_properties_get_int( properties, "width" );
 152                 profile->height = mlt_properties_get_int( properties, "height" );
 153                 profile->progressive = mlt_properties_get_int( properties, "progressive" );
 154                 profile->sample_aspect_num = mlt_properties_get_int( properties, "sample_aspect_num" );
 155                 profile->sample_aspect_den = mlt_properties_get_int( properties, "sample_aspect_den" );
 156                 profile->display_aspect_num = mlt_properties_get_int( properties, "display_aspect_num" );
 157                 profile->display_aspect_den = mlt_properties_get_int( properties, "display_aspect_den" );
 158         }
 159         return profile;
 160 }
 161
 162 /** Load an anonymous profile from string
 163 */
 164
 165 mlt_profile mlt_profile_load_string( const char *string )
 166 {
 167         mlt_properties properties = mlt_properties_new();
 168         if ( properties )
 169         {
 170                 const char *p = string;
 171                 while ( p )
 172                 {
 173                         if ( strcmp( p, "" ) && p[ 0 ] != '#' )
 174                                 mlt_properties_parse( properties, p );
 175                         p = strchr( p, '\n' );
 176                         if ( p ) p++;
 177                 }
 178         }
 179         return mlt_profile_load_properties( properties );
 180 }
 181
 182 /** Get the framerate as float
 183 */
 184
 185 double mlt_profile_fps( mlt_profile aprofile )
 186 {
 187         if ( aprofile )
 188                 return ( double ) aprofile->frame_rate_num / aprofile->frame_rate_den;
 189         else
 190                 return ( double ) mlt_profile_get()->frame_rate_num / mlt_profile_get()->frame_rate_den;
 191 }
 192
 193 /** Get the sample aspect ratio as float
 194 */
 195
 196 double mlt_profile_sar( mlt_profile aprofile )
 197 {
 198         if ( aprofile )
 199                 return ( double ) aprofile->sample_aspect_num / aprofile->sample_aspect_den;
 200         else
 201                 return ( double ) mlt_profile_get()->sample_aspect_num / mlt_profile_get()->sample_aspect_den;
 202 }
 203
 204 /** Get the display aspect ratio as float
 205 */
 206
 207 double mlt_profile_dar( mlt_profile aprofile )
 208 {
 209         if ( aprofile )
 210                 return ( double ) aprofile->display_aspect_num / aprofile->display_aspect_den;
 211         else
 212                 return ( double ) mlt_profile_get()->display_aspect_num / mlt_profile_get()->display_aspect_den;
 213 }
 214
 215 /** Free up the global profile resources
 216 */
 217
 218 void mlt_profile_close( )
 219 {
 220         if ( profile )
 221         {
 222                 if ( profile->description )
 223                         free( profile->description );
 224                 profile->description = NULL;
 225                 free( profile );
 226                 profile = NULL;
 227         }
 228 }