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         const char *prefix = PREFIX;
  67         char *filename = calloc( 1, strlen( prefix ) + strlen( PROFILES_DIR ) + strlen( name ) + 2 );
  68         strcpy( filename, prefix );
  69         if ( filename[ strlen( filename ) - 1 ] != '/' )
  70                 filename[ strlen( filename ) ] = '/';
  71         strcat( filename, PROFILES_DIR );
  72         strcat( filename, name );
  73         return mlt_profile_load_file( filename );
  74 }
  75
  76 /** Load a profile from specific file
  77 */
  78
  79 mlt_profile mlt_profile_load_file( const char *file )
  80 {
  81         // Load the profile as properties
  82         mlt_properties properties = mlt_properties_load( file );
  83         if ( properties && mlt_properties_get_int( properties, "width" ) )
  84         {
  85                 mlt_profile_load_properties( properties );
  86                 mlt_properties_close( properties );
  87
  88                 // Set MLT_PROFILE to basename
  89                 char *filename = strdup( file );
  90                 mlt_environment_set( "MLT_PROFILE", basename( filename ) );
  91                 free( filename );
  92         }
  93         else
  94         {
  95                 // Cleanup
  96                 mlt_properties_close( properties );
  97                 mlt_profile_close();
  98                 // Failover
  99                 mlt_profile_get();
 100         }
 101
 102         // Set MLT_NORMALISATION to appease legacy modules
 103         char *profile_name = mlt_environment( "MLT_PROFILE" );
 104         if ( strstr( profile_name, "_ntsc" ) ||
 105              strstr( profile_name, "_60" ) ||
 106              strstr( profile_name, "_30" ) )
 107         {
 108                 mlt_environment_set( "MLT_NORMALISATION", "NTSC" );
 109         }
 110         else if ( strstr( profile_name, "_pal" ) ||
 111                   strstr( profile_name, "_50" ) ||
 112                   strstr( profile_name, "_25" ) )
 113         {
 114                 mlt_environment_set( "MLT_NORMALISATION", "PAL" );
 115         }
 116
 117         return profile;
 118 }
 119
 120 /** Load a profile from a properties object
 121 */
 122
 123 mlt_profile mlt_profile_load_properties( mlt_properties properties )
 124 {
 125         mlt_profile_close();
 126         profile = calloc( 1, sizeof( struct mlt_profile_s ) );
 127         if ( profile )
 128         {
 129                 if ( mlt_properties_get( properties, "name" ) )
 130                         mlt_environment_set( "MLT_PROFILE", mlt_properties_get( properties, "name" ) );
 131                 if ( mlt_properties_get( properties, "description" ) )
 132                         profile->description = strdup( mlt_properties_get( properties, "description" ) );
 133                 profile->frame_rate_num = mlt_properties_get_int( properties, "frame_rate_num" );
 134                 profile->frame_rate_den = mlt_properties_get_int( properties, "frame_rate_den" );
 135                 profile->width = mlt_properties_get_int( properties, "width" );
 136                 profile->height = mlt_properties_get_int( properties, "height" );
 137                 profile->progressive = mlt_properties_get_int( properties, "progressive" );
 138                 profile->sample_aspect_num = mlt_properties_get_int( properties, "sample_aspect_num" );
 139                 profile->sample_aspect_den = mlt_properties_get_int( properties, "sample_aspect_den" );
 140                 profile->display_aspect_num = mlt_properties_get_int( properties, "display_aspect_num" );
 141                 profile->display_aspect_den = mlt_properties_get_int( properties, "display_aspect_den" );
 142         }
 143         return profile;
 144 }
 145
 146 /** Load an anonymous profile from string
 147 */
 148
 149 mlt_profile mlt_profile_load_string( const char *string )
 150 {
 151         mlt_properties properties = mlt_properties_new();
 152         if ( properties )
 153         {
 154                 const char *p = string;
 155                 while ( p )
 156                 {
 157                         if ( strcmp( p, "" ) && p[ 0 ] != '#' )
 158                                 mlt_properties_parse( properties, p );
 159                         p = strchr( p, '\n' );
 160                         if ( p ) p++;
 161                 }
 162         }
 163         return mlt_profile_load_properties( properties );
 164 }
 165
 166 /** Get the framerate as float
 167 */
 168
 169 double mlt_profile_fps( mlt_profile aprofile )
 170 {
 171         if ( aprofile )
 172                 return ( double ) aprofile->frame_rate_num / aprofile->frame_rate_den;
 173         else
 174                 return ( double ) mlt_profile_get()->frame_rate_num / mlt_profile_get()->frame_rate_den;
 175 }
 176
 177 /** Get the sample aspect ratio as float
 178 */
 179
 180 double mlt_profile_sar( mlt_profile aprofile )
 181 {
 182         if ( aprofile )
 183                 return ( double ) aprofile->sample_aspect_num / aprofile->sample_aspect_den;
 184         else
 185                 return ( double ) mlt_profile_get()->sample_aspect_num / mlt_profile_get()->sample_aspect_den;
 186 }
 187
 188 /** Get the display aspect ratio as float
 189 */
 190
 191 double mlt_profile_dar( mlt_profile aprofile )
 192 {
 193         if ( aprofile )
 194                 return ( double ) aprofile->display_aspect_num / aprofile->display_aspect_den;
 195         else
 196                 return ( double ) mlt_profile_get()->display_aspect_num / mlt_profile_get()->display_aspect_den;
 197 }
 198
 199 /** Free up the global profile resources
 200 */
 201
 202 void mlt_profile_close( )
 203 {
 204         if ( profile )
 205         {
 206                 if ( profile->description )
 207                         free( profile->description );
 208                 profile->description = NULL;
 209                 free( profile );
 210                 profile = NULL;
 211         }
 212 }