2 * transition_luma.c -- a generic dissolve/wipe processor
3 * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
4 * Author: Dan Dennedy <dan@dennedy.org>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program 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
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software Foundation,
18 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
21 #include "transition_luma.h"
22 #include <framework/mlt_frame.h>
34 struct mlt_transition_s parent;
43 // forward declarations
44 static void transition_close( mlt_transition parent );
47 // image processing functions
49 static inline double smoothstep( double edge1, double edge2, double a )
57 a = ( a - edge1 ) / ( edge2 - edge1 );
59 return ( a * a * ( 3 - 2 * a ) );
64 \param field_order -1 = progressive, 0 = lower field first, 1 = top field first
66 static void luma_composite( mlt_frame this, mlt_frame b_frame, int luma_width, int luma_height,
67 double *luma_bitmap, double pos, double frame_delta, double softness, int field_order )
69 int width_src, height_src;
70 int width_dest, height_dest;
71 mlt_image_format format_src, format_dest;
72 uint8_t *p_src, *p_dest;
79 format_src = mlt_image_yuv422;
80 format_dest = mlt_image_yuv422;
82 mlt_frame_get_image( this, &p_dest, &format_dest, &width_dest, &height_dest, 1 /* writable */ );
83 mlt_frame_get_image( b_frame, &p_src, &format_src, &width_src, &height_src, 0 /* writable */ );
85 stride_src = width_src * 2;
86 stride_dest = width_dest * 2;
88 // composite using luma map
89 for ( field = 0; field < ( field_order < 0 ? 1 : 2 ); ++field )
91 // Offset the position based on which field we're looking at ...
92 double field_pos = pos + ( ( field_order == 0 ? 1 - field : field) * frame_delta * 0.5 );
94 // adjust the position for the softness level
95 field_pos *= ( 1.0 + softness );
97 for ( i = field; i < height_src; i += ( field_order < 0 ? 1 : 2 ) )
99 uint8_t *p = &p_src[ i * stride_src ];
100 uint8_t *q = &p_dest[ i * stride_dest ];
101 uint8_t *o = &p_dest[ i * stride_dest ];
102 double *l = &luma_bitmap[ i * luma_width ];
104 for ( j = 0; j < width_src; j ++ )
109 double value = smoothstep( weight, weight + softness, field_pos );
111 *o ++ = (uint8_t)( y * value + *q++ * ( 1 - value ) );
112 *o ++ = (uint8_t)( uv * value + *q++ * ( 1 - value ) );
121 static int transition_get_image( mlt_frame this, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
123 // Get the properties of the a frame
124 mlt_properties a_props = mlt_frame_properties( this );
126 // Get the b frame from the stack
127 mlt_frame b_frame = mlt_frame_pop_frame( this );
129 // Get the properties of the b frame
130 mlt_properties b_props = mlt_frame_properties( b_frame );
132 // Arbitrary composite defaults
133 static double previous_mix = 0;
137 double *luma_bitmap = NULL;
138 double luma_softness = 0;
140 int top_field_first = 0;
142 // mix is the offset time value in the duration of the transition
143 // - also used as the mixing level for a dissolve
144 if ( mlt_properties_get( b_props, "image.mix" ) != NULL )
145 mix = mlt_properties_get_double( b_props, "image.mix" );
147 // (mix - previous_mix) is the animation delta, if backwards reset previous
148 if ( mix < previous_mix )
151 // Get the interlace and field properties of the frame
152 if ( mlt_properties_get( b_props, "progressive" ) != NULL )
153 progressive = mlt_properties_get_int( b_props, "progressive" );
154 if ( mlt_properties_get( b_props, "top_field_first" ) != NULL )
155 top_field_first = mlt_properties_get_int( b_props, "top_field_first" );
157 // Get the luma map parameters
158 if ( mlt_properties_get( b_props, "luma.width" ) != NULL )
159 luma_width = mlt_properties_get_int( b_props, "luma.width" );
160 if ( mlt_properties_get( b_props, "luma.height" ) != NULL )
161 luma_height = mlt_properties_get_int( b_props, "luma.height" );
162 if ( mlt_properties_get( b_props, "luma.softness" ) != NULL )
163 luma_softness = mlt_properties_get_double( b_props, "luma.softness" );
164 luma_bitmap = (double*) mlt_properties_get_data( b_props, "luma.bitmap", NULL );
166 if ( luma_width > 0 && luma_height > 0 && luma_bitmap != NULL )
167 // Composite the frames using a luma map
168 luma_composite( this, b_frame, luma_width, luma_height, luma_bitmap, mix, mix - previous_mix,
169 luma_softness, progressive > 0 ? -1 : top_field_first );
171 // Dissolve the frames using the time offset for mix value
172 mlt_frame_composite_yuv( this, b_frame, 0, 0, mix );
174 // Extract the a_frame image info
175 *width = mlt_properties_get_int( a_props, "width" );
176 *height = mlt_properties_get_int( a_props, "height" );
177 *image = mlt_properties_get_data( a_props, "image", NULL );
184 /** Load the luma map from PGM stream.
187 static void luma_read_pgm( FILE *f, double **map, int *width, int *height )
189 uint8_t *data = NULL;
200 // get the magic code
201 if ( fgets( line, 127, f ) == NULL )
203 if ( line[0] != 'P' || line[1] != '5' )
206 // skip white space and see if a new line must be fetched
207 for ( i = 2; i < 127 && line[i] != '\0' && isspace( line[i] ); i++ );
208 if ( line[i] == '\0' && fgets( line, 127, f ) == NULL )
211 // get the dimensions
212 if ( line[0] == 'P' )
213 i = sscanf( line, "P5 %d %d %d", width, height, &maxval );
215 i = sscanf( line, "%d %d %d", width, height, &maxval );
217 // get the height value, if not yet
220 if ( fgets( line, 127, f ) == NULL )
222 i = sscanf( line, "%d", height );
229 // get the maximum gray value, if not yet
232 if ( fgets( line, 127, f ) == NULL )
234 i = sscanf( line, "%d", &maxval );
239 // determine if this is one or two bytes per pixel
240 bpp = maxval > 255 ? 2 : 1;
241 // allocate temporary storage for the raw data
242 data = malloc( *width * *height * bpp );
247 if ( fread( data, *width * *height * bpp, 1, f ) != 1 )
250 // allocate the luma bitmap
251 *map = p = (double*) malloc( *width * *height * sizeof( double ) );
255 // proces the raw data into the luma bitmap
256 for ( i = 0; i < *width * *height * bpp; i += bpp )
259 *p++ = (double) data[ i ] / (double) maxval;
261 *p++ = (double) ( ( data[ i ] << 8 ) + data[ i+1 ] ) / (double) maxval;
272 /** Luma transition processing.
275 static mlt_frame transition_process( mlt_transition transition, mlt_frame a_frame, mlt_frame b_frame )
277 transition_luma *this = (transition_luma*) transition->child;
279 // Get the properties of the transition
280 mlt_properties properties = mlt_transition_properties( transition );
282 // Get the properties of the b frame
283 mlt_properties b_props = mlt_frame_properties( b_frame );
285 // If the filename property changed, reload the map
286 char *luma_file = mlt_properties_get( properties, "filename" );
287 if ( luma_file != NULL && ( this->filename == NULL || ( this->filename && strcmp( luma_file, this->filename ) ) ) )
289 int width = mlt_properties_get_int( b_props, "width" );
290 int height = mlt_properties_get_int( b_props, "height" );
294 command[ 511 ] = '\0';
295 if ( this->filename )
296 free( this->filename );
297 this->filename = strdup( luma_file );
298 snprintf( command, 511, "anytopnm %s | pnmscale -width %d -height %d", luma_file, width, height );
299 //pipe = popen( command, "r" );
300 pipe = fopen( luma_file, "r" );
304 free( this->bitmap );
305 luma_read_pgm( pipe, &this->bitmap, &this->width, &this->height );
312 // Determine the time position of this frame in the transition duration
313 mlt_position in = mlt_transition_get_in( transition );
314 mlt_position out = mlt_transition_get_out( transition );
315 mlt_position time = mlt_frame_get_position( b_frame );
316 double pos = ( double )( time - in ) / ( double )( out - in + 1 );
318 // Set the b frame properties
319 mlt_properties_set_double( b_props, "image.mix", pos );
320 mlt_properties_set_int( b_props, "luma.width", this->width );
321 mlt_properties_set_int( b_props, "luma.height", this->height );
322 mlt_properties_set_data( b_props, "luma.bitmap", this->bitmap, 0, NULL, NULL );
323 if ( mlt_properties_get( properties, "softness" ) != NULL )
324 mlt_properties_set_double( b_props, "luma.softness", mlt_properties_get_double( properties, "softness" ) );
326 mlt_frame_push_get_image( a_frame, transition_get_image );
327 mlt_frame_push_frame( a_frame, b_frame );
332 /** Constructor for the filter.
335 mlt_transition transition_luma_init( char *lumafile )
337 transition_luma *this = calloc( sizeof( transition_luma ), 1 );
340 mlt_transition transition = &this->parent;
341 mlt_transition_init( transition, this );
342 transition->process = transition_process;
343 transition->close = transition_close;
345 if ( lumafile != NULL )
346 mlt_properties_set( mlt_transition_properties( transition ), "filename", lumafile );
348 return &this->parent;
353 /** Close the transition.
356 static void transition_close( mlt_transition parent )
358 transition_luma *this = (transition_luma*) parent->child;
361 free( this->bitmap );
363 if ( this->filename )
364 free( this->filename );