2 * filter_dynamictext.c -- dynamic text overlay filter
3 * Copyright (C) 2011 Ushodaya Enterprises Limited
4 * Author: Brian Matherly <pez4brian@yahoo.com>
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.
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.
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
21 #include <framework/mlt.h>
25 #include <sys/types.h> // for stat()
26 #include <sys/stat.h> // for stat()
27 #include <unistd.h> // for stat()
28 #include <time.h> // for strftime() and gtime()
30 #define MAX_TEXT_LEN 512
33 static void get_timecode_str( mlt_filter filter, mlt_frame frame, char* text )
35 int frames = mlt_frame_get_position( frame );
36 double fps = mlt_profile_fps( mlt_service_profile( MLT_FILTER_SERVICE( filter ) ) );
40 strncat( text, "-", MAX_TEXT_LEN - strlen(text) - 1 );
44 int seconds = frames / fps;
45 frames = frames % lrint( fps );
46 int minutes = seconds / 60;
47 seconds = seconds % 60;
48 int hours = minutes / 60;
49 minutes = minutes % 60;
50 sprintf(tc, "%.2d:%.2d:%.2d:%.2d", hours, minutes, seconds, frames);
51 strncat( text, tc, MAX_TEXT_LEN - strlen(text) - 1 );
55 static void get_frame_str( mlt_filter filter, mlt_frame frame, char* text )
57 int pos = mlt_frame_get_position( frame );
59 snprintf( s, sizeof(s) - 1, "%d", pos );
60 strncat( text, s, MAX_TEXT_LEN - strlen(text) - 1 );
63 static void get_filedate_str( mlt_filter filter, mlt_frame frame, char* text )
65 mlt_producer producer = mlt_producer_cut_parent(mlt_frame_get_original_producer( frame ));
66 mlt_properties producer_properties = MLT_PRODUCER_PROPERTIES(producer);
67 char* filename = mlt_properties_get( producer_properties, "resource");
68 struct stat file_info;
70 if( !stat(filename, &file_info))
72 struct tm* time_info = gmtime( &(file_info.st_mtime) );
74 strftime( date, 11, "%Y/%m/%d", time_info );
75 strncat( text, date, MAX_TEXT_LEN - strlen(text) - 1);
79 /** Perform substitution for keywords that are enclosed in "# #".
82 static void substitute_keywords(mlt_filter filter, char* result, char* value, mlt_frame frame)
84 char value_copy[MAX_TEXT_LEN] = "";
89 // Need to copy the value because strtok will modify it.
90 strncpy(value_copy, value, 512);
91 keyword = strtok( value_copy, "#" );
92 fromStart = ( value_copy[0] == '#' ) ? 1 : 0;
96 if ( ct % 2 == fromStart )
98 // backslash in front of # suppresses substitution
99 if ( keyword[ strlen( keyword ) -1 ] == '\\' )
101 // keep characters except backslash
102 strncat( result, keyword, strlen( keyword ) -1 );
103 strcat( result, "#" );
108 strcat( result, keyword );
111 else if ( !strcmp( keyword, "timecode" ) )
113 get_timecode_str(filter, frame, result);
115 else if ( !strcmp( keyword, "frame" ) )
117 get_frame_str(filter, frame, result);
119 else if ( !strcmp( keyword, "filedate" ) )
121 get_filedate_str(filter, frame, result);
123 else if ( !strcmp( keyword, "resource" ) )
125 // special case: replace #resource# with cut parent resource name
126 mlt_producer producer = mlt_producer_cut_parent(mlt_frame_get_original_producer( frame ));
127 mlt_properties producer_properties = MLT_PRODUCER_PROPERTIES(producer);
128 strncat( result, mlt_properties_get( producer_properties, "resource"), MAX_TEXT_LEN - strlen(result) - 1 );
132 // replace keyword with property value from this frame
133 mlt_properties frame_properties = MLT_FRAME_PROPERTIES( frame );
134 char *frame_value = mlt_properties_get( frame_properties, keyword );
137 strncat( result, frame_value, MAX_TEXT_LEN - strlen(result) - 1 );
140 keyword = strtok( NULL, "#" );
145 static void apply_filter(mlt_filter filter, mlt_frame frame )
147 mlt_properties my_properties = MLT_FILTER_PROPERTIES( filter );
148 mlt_filter watermark = mlt_properties_get_data( my_properties, "_watermark", NULL );
149 mlt_properties watermark_properties = MLT_FILTER_PROPERTIES( watermark );
150 char* dynamic_text = mlt_properties_get( my_properties, "argument");
152 // Check for keywords in dynamic text
155 // Apply keyword substitution before passing the text to the filter.
156 char result[512] = "";
157 substitute_keywords( filter, result, dynamic_text, frame );
158 mlt_properties_set( watermark_properties, "producer.markup", (char*) result );
161 // Pass the properties to the watermark filter composite transition
162 mlt_properties_set( watermark_properties, "composite.geometry", mlt_properties_get( my_properties, "geometry" ) );
164 // Pass the properties to the watermark filter pango producer
165 mlt_properties_set( watermark_properties, "producer.font", mlt_properties_get( my_properties, "font" ) );
166 mlt_properties_set( watermark_properties, "producer.weight", mlt_properties_get( my_properties, "weight" ) );
167 mlt_properties_set( watermark_properties, "producer.fgcolour", mlt_properties_get( my_properties, "fgcolour" ) );
168 mlt_properties_set( watermark_properties, "producer.bgcolour", mlt_properties_get( my_properties, "bgcolour" ) );
170 // Process the filter
171 mlt_filter_process( watermark, frame );
177 static int filter_get_image( mlt_frame frame, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
180 mlt_filter filter = mlt_frame_pop_service( frame );
182 mlt_service_lock( MLT_FILTER_SERVICE( filter ) );
184 apply_filter(filter, frame);
186 mlt_service_unlock( MLT_FILTER_SERVICE( filter ) );
188 // Need to get the image
189 return mlt_frame_get_image( frame, image, format, width, height, 1 );
193 /** Filter processing.
196 static mlt_frame filter_process( mlt_filter filter, mlt_frame frame )
199 mlt_frame_push_service( frame, filter );
201 // Register the get image method
202 mlt_frame_push_get_image( frame, filter_get_image );
208 /** Constructor for the filter.
211 mlt_filter filter_dynamictext_init( mlt_profile profile, mlt_service_type type, const char *id, void *arg )
214 mlt_filter filter = mlt_filter_new( );
215 mlt_filter watermark = mlt_factory_filter( profile, "watermark", "pango:" );
218 if ( filter && watermark )
220 // Get the properties
221 mlt_properties properties = MLT_FILTER_PROPERTIES( filter );
223 // Store the watermark filter for future use
224 mlt_properties_set_data( properties, "_watermark", watermark, 0, ( mlt_destructor )mlt_filter_close, NULL );
226 // Assign default values
227 mlt_properties_set( properties, "argument", arg ? arg: "#timecode#" );
228 mlt_properties_set( properties, "geometry", "0%/0%:100%x100%:100" );
229 mlt_properties_set( properties, "font", "Sans 48" );
230 mlt_properties_set( properties, "weight", "400" );
231 mlt_properties_set( properties, "fgcolour", "0x000000ff" );
232 mlt_properties_set( properties, "bgcolour", "0x00000020" );
234 // Specify the processing method
235 filter->process = filter_process;
237 else // filter or watermark failed for some reason
241 mlt_filter_close(filter);
246 mlt_filter_close(watermark);