3 * \brief video output definition
6 * Copyright (C) 2007-2009 Ushodaya Enterprises Limited
7 * \author Dan Dennedy <dan@dennedy.org>
9 * This library is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Lesser General Public
11 * License as published by the Free Software Foundation; either
12 * version 2.1 of the License, or (at your option) any later version.
14 * This library is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Lesser General Public License for more details.
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with this library; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24 #include "mlt_profile.h"
25 #include "mlt_factory.h"
26 #include "mlt_properties.h"
33 /** the default subdirectory of the prefix for holding profiles */
34 #define PROFILES_DIR "/share/mlt/profiles/"
36 /** Load a profile from the system folder.
38 * The environment variable MLT_PROFILES_PATH overrides the default \p PROFILES_DIR.
40 * \private \memberof mlt_profile_s
41 * \param name the name of a profile settings file located in the standard location or
42 * the full path name to a profile settings file
43 * \return a profile or NULL on error
46 static mlt_profile mlt_profile_select( const char *name )
48 char *filename = NULL;
49 const char *prefix = getenv( "MLT_PROFILES_PATH" );
50 mlt_properties properties = mlt_properties_load( name );
51 mlt_profile profile = NULL;
53 // Try to load from file specification
54 if ( properties && mlt_properties_get_int( properties, "width" ) )
56 filename = calloc( 1, strlen( name ) + 1 );
58 // Load from $prefix/share/mlt/profiles
59 else if ( prefix == NULL )
62 filename = calloc( 1, strlen( prefix ) + strlen( PROFILES_DIR ) + strlen( name ) + 2 );
63 strcpy( filename, prefix );
64 if ( filename[ strlen( filename ) - 1 ] != '/' )
65 filename[ strlen( filename ) ] = '/';
66 strcat( filename, PROFILES_DIR );
68 // Use environment variable instead
71 filename = calloc( 1, strlen( prefix ) + strlen( name ) + 2 );
72 strcpy( filename, prefix );
73 if ( filename[ strlen( filename ) - 1 ] != '/' )
74 filename[ strlen( filename ) ] = '/';
78 strcat( filename, name );
79 profile = mlt_profile_load_file( filename );
82 mlt_properties_close( properties );
88 /** Construct a profile.
90 * This will never return NULL as it uses the dv_pal settings as hard-coded fallback default.
92 * \public \memberof mlt_profile_s
93 * @param name the name of a profile settings file located in the standard location or
94 * the full path name to a profile settings file
98 mlt_profile mlt_profile_init( const char *name )
100 mlt_profile profile = NULL;
102 // Explicit profile by name gets priority over environment variables
104 profile = mlt_profile_select( name );
106 // Try to load by environment variable
107 if ( profile == NULL )
109 // MLT_PROFILE is preferred environment variable
110 if ( getenv( "MLT_PROFILE" ) )
111 profile = mlt_profile_select( getenv( "MLT_PROFILE" ) );
112 // MLT_NORMALISATION backwards compatibility
113 else if ( getenv( "MLT_NORMALISATION" ) && strcmp( getenv( "MLT_NORMALISATION" ), "PAL" ) )
114 profile = mlt_profile_select( "dv_ntsc" );
116 profile = mlt_profile_select( "dv_pal" );
118 // If still not loaded (no profile files), default to PAL
119 if ( profile == NULL )
121 profile = calloc( 1, sizeof( struct mlt_profile_s ) );
124 mlt_environment_set( "MLT_PROFILE", "dv_pal" );
125 profile->description = strdup( "PAL 4:3 DV or DVD" );
126 profile->frame_rate_num = 25;
127 profile->frame_rate_den = 1;
128 profile->width = 720;
129 profile->height = 576;
130 profile->progressive = 0;
131 profile->sample_aspect_num = 16;
132 profile->sample_aspect_den = 15;
133 profile->display_aspect_num = 4;
134 profile->display_aspect_den = 3;
141 static void set_mlt_normalisation( const char *profile_name )
145 if ( strstr( profile_name, "_ntsc" ) ||
146 strstr( profile_name, "_60" ) ||
147 strstr( profile_name, "_2997" ) ||
148 strstr( profile_name, "_30" ) )
150 mlt_environment_set( "MLT_NORMALISATION", "NTSC" );
152 else if ( strstr( profile_name, "_pal" ) ||
153 strstr( profile_name, "_50" ) ||
154 strstr( profile_name, "_25" ) )
156 mlt_environment_set( "MLT_NORMALISATION", "PAL" );
161 /** Load a profile from specific file.
163 * \public \memberof mlt_profile_s
164 * @param file the full path name to a properties file
165 * @return a profile or NULL on error
168 mlt_profile mlt_profile_load_file( const char *file )
170 mlt_profile profile = NULL;
172 // Load the profile as properties
173 mlt_properties properties = mlt_properties_load( file );
176 // Simple check if the profile is valid
177 if ( mlt_properties_get_int( properties, "width" ) )
179 profile = mlt_profile_load_properties( properties );
181 // Set MLT_PROFILE to basename
182 char *filename = strdup( file );
183 mlt_environment_set( "MLT_PROFILE", basename( filename ) );
184 set_mlt_normalisation( basename( filename ) );
187 mlt_properties_close( properties );
190 // Set MLT_NORMALISATION to appease legacy modules
191 char *profile_name = mlt_environment( "MLT_PROFILE" );
192 set_mlt_normalisation( profile_name );
196 /** Load a profile from a properties object.
198 * \public \memberof mlt_profile_s
199 * @param properties a properties list
200 * @return a profile or NULL if out of memory
203 mlt_profile mlt_profile_load_properties( mlt_properties properties )
205 mlt_profile profile = calloc( 1, sizeof( struct mlt_profile_s ) );
208 if ( mlt_properties_get( properties, "name" ) )
209 mlt_environment_set( "MLT_PROFILE", mlt_properties_get( properties, "name" ) );
210 if ( mlt_properties_get( properties, "description" ) )
211 profile->description = strdup( mlt_properties_get( properties, "description" ) );
212 profile->frame_rate_num = mlt_properties_get_int( properties, "frame_rate_num" );
213 profile->frame_rate_den = mlt_properties_get_int( properties, "frame_rate_den" );
214 profile->width = mlt_properties_get_int( properties, "width" );
215 profile->height = mlt_properties_get_int( properties, "height" );
216 profile->progressive = mlt_properties_get_int( properties, "progressive" );
217 profile->sample_aspect_num = mlt_properties_get_int( properties, "sample_aspect_num" );
218 profile->sample_aspect_den = mlt_properties_get_int( properties, "sample_aspect_den" );
219 profile->display_aspect_num = mlt_properties_get_int( properties, "display_aspect_num" );
220 profile->display_aspect_den = mlt_properties_get_int( properties, "display_aspect_den" );
225 /** Load an anonymous profile from string.
227 * \public \memberof mlt_profile_s
228 * @param string a newline-delimited list of properties as name=value pairs
229 * @return a profile or NULL if out of memory
232 mlt_profile mlt_profile_load_string( const char *string )
234 mlt_properties properties = mlt_properties_new();
237 const char *p = string;
240 if ( strcmp( p, "" ) && p[ 0 ] != '#' )
241 mlt_properties_parse( properties, p );
242 p = strchr( p, '\n' );
246 return mlt_profile_load_properties( properties );
249 /** Get the video frame rate as a floating point value.
251 * \public \memberof mlt_profile_s
252 * @param aprofile a profile
253 * @return the frame rate
256 double mlt_profile_fps( mlt_profile aprofile )
259 return ( double ) aprofile->frame_rate_num / aprofile->frame_rate_den;
264 /** Get the sample aspect ratio as a floating point value.
266 * \public \memberof mlt_profile_s
267 * @param aprofile a profile
268 * @return the pixel aspect ratio
271 double mlt_profile_sar( mlt_profile aprofile )
274 return ( double ) aprofile->sample_aspect_num / aprofile->sample_aspect_den;
279 /** Get the display aspect ratio as floating point value.
281 * \public \memberof mlt_profile_s
282 * @param aprofile a profile
283 * @return the image aspect ratio
286 double mlt_profile_dar( mlt_profile aprofile )
289 return ( double ) aprofile->display_aspect_num / aprofile->display_aspect_den;
294 /** Free up the global profile resources.
296 * \public \memberof mlt_profile_s
297 * @param profile a profile
300 void mlt_profile_close( mlt_profile profile )
304 if ( profile->description )
305 free( profile->description );
306 profile->description = NULL;