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>
35 struct mlt_transition_s parent;
43 // forward declarations
44 static void transition_close( mlt_transition parent );
46 /** Calculate the position for this frame.
49 static float position_calculate( mlt_transition this, mlt_frame frame )
51 // Get the in and out position
52 mlt_position in = mlt_transition_get_in( this );
53 mlt_position out = mlt_transition_get_out( this );
55 // Get the position of the frame
56 mlt_position position = mlt_frame_get_position( frame );
59 return ( float )( position - in ) / ( float )( out - in + 1 );
62 /** Calculate the field delta for this frame - position between two frames.
65 static float delta_calculate( mlt_transition this, mlt_frame frame )
67 // Get the in and out position
68 mlt_position in = mlt_transition_get_in( this );
69 mlt_position out = mlt_transition_get_out( this );
71 // Get the position of the frame
72 mlt_position position = mlt_frame_get_position( frame );
75 float x = ( float )( position - in ) / ( float )( out - in + 1 );
76 float y = ( float )( position + 1 - in ) / ( float )( out - in + 1 );
78 return ( y - x ) / 2.0;
81 static inline int dissolve_yuv( mlt_frame this, mlt_frame that, float weight, int width, int height )
84 int width_src = width, height_src = height;
85 mlt_image_format format = mlt_image_yuv422;
86 uint8_t *p_src, *p_dest;
90 int32_t weigh = weight * ( 1 << 16 );
91 int32_t weigh_complement = ( 1 - weight ) * ( 1 << 16 );
93 mlt_frame_get_image( this, &p_dest, &format, &width, &height, 1 );
94 mlt_frame_get_image( that, &p_src, &format, &width_src, &height_src, 0 );
97 limit = p_dest + height_src * width_src * 2;
101 *p_dest++ = ( *p_src++ * weigh + *p++ * weigh_complement ) >> 16;
102 *p_dest++ = ( *p_src++ * weigh + *p++ * weigh_complement ) >> 16;
108 // image processing functions
110 static inline uint32_t smoothstep( int32_t edge1, int32_t edge2, uint32_t a )
118 a = ( ( a - edge1 ) << 16 ) / ( edge2 - edge1 );
120 return ( ( ( a * a ) >> 16 ) * ( ( 3 << 16 ) - ( 2 * a ) ) ) >> 16;
125 \param field_order -1 = progressive, 0 = lower field first, 1 = top field first
127 static void luma_composite( mlt_frame a_frame, mlt_frame b_frame, int luma_width, int luma_height,
128 uint16_t *luma_bitmap, float pos, float frame_delta, float softness, int field_order,
129 int *width, int *height )
131 int width_src = *width, height_src = *height;
132 int width_dest = *width, height_dest = *height;
133 mlt_image_format format_src = mlt_image_yuv422, format_dest = mlt_image_yuv422;
134 uint8_t *p_src, *p_dest;
140 format_src = mlt_image_yuv422;
141 format_dest = mlt_image_yuv422;
143 mlt_frame_get_image( a_frame, &p_dest, &format_dest, &width_dest, &height_dest, 1 );
144 mlt_frame_get_image( b_frame, &p_src, &format_src, &width_src, &height_src, 0 );
146 stride_src = width_src * 2;
147 stride_dest = width_dest * 2;
149 // Offset the position based on which field we're looking at ...
150 int32_t field_pos[ 2 ];
151 field_pos[ 0 ] = ( pos + ( ( field_order == 0 ? 1 : 0 ) * frame_delta * 0.5 ) ) * ( 1 << 16 ) * ( 1.0 + softness );
152 field_pos[ 1 ] = ( pos + ( ( field_order == 0 ? 0 : 1 ) * frame_delta * 0.5 ) ) * ( 1 << 16 ) * ( 1.0 + softness );
161 int32_t x_diff = ( luma_width << 16 ) / *width;
162 int32_t y_diff = ( luma_height << 16 ) / *height;
163 int32_t x_offset = 0;
164 int32_t y_offset = 0;
168 int32_t i_softness = softness * ( 1 << 16 );
170 int field_count = field_order <= 0 ? 1 : 2;
171 int field_stride_src = field_count * stride_src;
172 int field_stride_dest = field_count * stride_dest;
176 // composite using luma map
177 while ( field < field_count )
179 p_row = p_src + field * stride_src;
180 q_row = p_dest + field * stride_dest;
181 y_offset = ( field * luma_width ) << 16;
184 while ( i < height_src )
189 l = luma_bitmap + ( y_offset >> 16 ) * ( luma_width * field_count );
195 weight = l[ x_offset >> 16 ];
196 value = smoothstep( weight, i_softness + weight, field_pos[ field ] );
197 *o ++ = ( *p ++ * value + *q++ * ( ( 1 << 16 ) - value ) ) >> 16;
198 *o ++ = ( *p ++ * value + *q++ * ( ( 1 << 16 ) - value ) ) >> 16;
204 p_row += field_stride_src;
205 q_row += field_stride_dest;
215 static int transition_get_image( mlt_frame a_frame, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
217 // Get the properties of the a frame
218 mlt_properties a_props = mlt_frame_properties( a_frame );
220 // Get the b frame from the stack
221 mlt_frame b_frame = mlt_frame_pop_frame( a_frame );
223 // Get the properties of the b frame
224 mlt_properties b_props = mlt_frame_properties( b_frame );
226 // Arbitrary composite defaults
227 float mix = mlt_properties_get_double( b_props, "image.mix" );
228 float frame_delta = mlt_properties_get_double( b_props, "luma.delta" );
229 int luma_width = mlt_properties_get_int( b_props, "luma.width" );
230 int luma_height = mlt_properties_get_int( b_props, "luma.height" );
231 uint16_t *luma_bitmap = mlt_properties_get_data( b_props, "luma.bitmap", NULL );
232 float luma_softness = mlt_properties_get_double( b_props, "luma.softness" );
233 int progressive = mlt_properties_get_int( b_props, "progressive" ) ||
234 mlt_properties_get_int( a_props, "consumer_progressive" ) ||
235 mlt_properties_get_int( b_props, "luma.progressive" );
237 int top_field_first = mlt_properties_get_int( b_props, "top_field_first" );
238 int reverse = mlt_properties_get_int( b_props, "luma.reverse" );
240 // Since we are the consumer of the b_frame, we must pass along this
241 // consumer property from the a_frame
242 mlt_properties_set_double( b_props, "consumer_aspect_ratio", mlt_properties_get_double( a_props, "consumer_aspect_ratio" ) );
243 mlt_properties_set_double( b_props, "consumer_scale", mlt_properties_get_double( a_props, "consumer_scale" ) );
245 // Honour the reverse here
249 mix = reverse ? 1 - mix : mix;
250 frame_delta *= reverse ? -1.0 : 1.0;
252 // Ensure we get scaling on the b_frame
253 mlt_properties_set( b_props, "rescale.interp", "nearest" );
255 if ( luma_width > 0 && luma_height > 0 && luma_bitmap != NULL )
256 // Composite the frames using a luma map
257 luma_composite( a_frame, b_frame, luma_width, luma_height, luma_bitmap, mix, frame_delta,
258 luma_softness, progressive ? -1 : top_field_first, width, height );
260 // Dissolve the frames using the time offset for mix value
261 dissolve_yuv( a_frame, b_frame, mix, *width, *height );
263 // Extract the a_frame image info
264 *width = mlt_properties_get_int( a_props, "width" );
265 *height = mlt_properties_get_int( a_props, "height" );
266 *image = mlt_properties_get_data( a_props, "image", NULL );
271 /** Load the luma map from PGM stream.
274 static void luma_read_pgm( FILE *f, uint16_t **map, int *width, int *height )
276 uint8_t *data = NULL;
287 // get the magic code
288 if ( fgets( line, 127, f ) == NULL )
290 if ( line[0] != 'P' || line[1] != '5' )
293 // skip white space and see if a new line must be fetched
294 for ( i = 2; i < 127 && line[i] != '\0' && isspace( line[i] ); i++ );
295 if ( line[i] == '\0' && fgets( line, 127, f ) == NULL )
298 // get the dimensions
299 if ( line[0] == 'P' )
300 i = sscanf( line, "P5 %d %d %d", width, height, &maxval );
302 i = sscanf( line, "%d %d %d", width, height, &maxval );
304 // get the height value, if not yet
307 if ( fgets( line, 127, f ) == NULL )
309 i = sscanf( line, "%d", height );
316 // get the maximum gray value, if not yet
319 if ( fgets( line, 127, f ) == NULL )
321 i = sscanf( line, "%d", &maxval );
326 // determine if this is one or two bytes per pixel
327 bpp = maxval > 255 ? 2 : 1;
329 // allocate temporary storage for the raw data
330 data = mlt_pool_alloc( *width * *height * bpp );
335 if ( fread( data, *width * *height * bpp, 1, f ) != 1 )
338 // allocate the luma bitmap
339 *map = p = (uint16_t*)mlt_pool_alloc( *width * *height * sizeof( uint16_t ) );
343 // proces the raw data into the luma bitmap
344 for ( i = 0; i < *width * *height * bpp; i += bpp )
347 *p++ = data[ i ] << 8;
349 *p++ = ( data[ i ] << 8 ) + data[ i+1 ];
356 mlt_pool_release( data );
360 /** Luma transition processing.
363 static mlt_frame transition_process( mlt_transition transition, mlt_frame a_frame, mlt_frame b_frame )
365 transition_luma *this = (transition_luma*) transition->child;
367 // Get the properties of the transition
368 mlt_properties properties = mlt_transition_properties( transition );
370 // Get the properties of the b frame
371 mlt_properties b_props = mlt_frame_properties( b_frame );
373 // If the filename property changed, reload the map
374 char *lumafile = mlt_properties_get( properties, "resource" );
375 if ( this->bitmap == NULL && lumafile != NULL )
377 FILE *pipe = fopen( lumafile, "r" );
380 luma_read_pgm( pipe, &this->bitmap, &this->width, &this->height );
385 // Set the b frame properties
386 mlt_properties_set_double( b_props, "image.mix", position_calculate( transition, a_frame ) );
387 mlt_properties_set_double( b_props, "luma.delta", delta_calculate( transition, a_frame ) );
388 mlt_properties_set_int( b_props, "luma.width", this->width );
389 mlt_properties_set_int( b_props, "luma.height", this->height );
390 mlt_properties_set_data( b_props, "luma.bitmap", this->bitmap, 0, NULL, NULL );
391 mlt_properties_set_int( b_props, "luma.reverse", mlt_properties_get_int( properties, "reverse" ) );
392 mlt_properties_set_double( b_props, "luma.softness", mlt_properties_get_double( properties, "softness" ) );
394 mlt_frame_push_get_image( a_frame, transition_get_image );
395 mlt_frame_push_frame( a_frame, b_frame );
400 /** Constructor for the filter.
403 mlt_transition transition_luma_init( char *lumafile )
405 transition_luma *this = calloc( sizeof( transition_luma ), 1 );
408 mlt_transition transition = &this->parent;
409 mlt_transition_init( transition, this );
410 transition->process = transition_process;
411 transition->close = transition_close;
412 mlt_properties_set( mlt_transition_properties( transition ), "resource", lumafile );
413 return &this->parent;
418 /** Close the transition.
421 static void transition_close( mlt_transition parent )
423 transition_luma *this = (transition_luma*) parent->child;
424 mlt_pool_release( this->bitmap );