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;
42 // forward declarations
43 static void transition_close( mlt_transition parent );
45 /** Calculate the position for this frame.
48 static float position_calculate( mlt_transition this, mlt_frame frame )
50 // Get the in and out position
51 mlt_position in = mlt_transition_get_in( this );
52 mlt_position out = mlt_transition_get_out( this );
54 // Get the position of the frame
55 mlt_position position = mlt_frame_get_position( frame );
58 return ( float )( position - in ) / ( float )( out - in + 1 );
61 /** Calculate the field delta for this frame - position between two frames.
64 static float delta_calculate( mlt_transition this, mlt_frame frame )
66 // Get the in and out position
67 mlt_position in = mlt_transition_get_in( this );
68 mlt_position out = mlt_transition_get_out( this );
70 // Get the position of the frame
71 mlt_position position = mlt_frame_get_position( frame );
74 float x = ( float )( position - in ) / ( float )( out - in + 1 );
75 float y = ( float )( position + 1 - in ) / ( float )( out - in + 1 );
77 return ( y - x ) / 2.0;
80 static inline int dissolve_yuv( mlt_frame this, mlt_frame that, float weight, int width, int height )
83 int width_src = width, height_src = height;
84 mlt_image_format format = mlt_image_yuv422;
85 uint8_t *p_src, *p_dest;
89 int32_t weigh = weight * ( 1 << 16 );
90 int32_t weigh_complement = ( 1 - weight ) * ( 1 << 16 );
92 mlt_frame_get_image( this, &p_dest, &format, &width, &height, 1 );
93 mlt_frame_get_image( that, &p_src, &format, &width_src, &height_src, 0 );
96 limit = p_dest + height_src * width_src * 2;
100 *p_dest++ = ( *p_src++ * weigh + *p++ * weigh_complement ) >> 16;
101 *p_dest++ = ( *p_src++ * weigh + *p++ * weigh_complement ) >> 16;
107 // image processing functions
109 static uint32_t smoothstep( int32_t edge1, int32_t edge2, uint32_t a )
117 a = ( ( a - edge1 ) << 16 ) / ( edge2 - edge1 );
119 return ( ( ( a * a ) >> 16 ) * ( ( 3 << 16 ) - ( 2 * a ) ) ) >> 16;
124 \param field_order -1 = progressive, 0 = lower field first, 1 = top field first
126 static void luma_composite( mlt_frame a_frame, mlt_frame b_frame, int luma_width, int luma_height,
127 uint16_t *luma_bitmap, float pos, float frame_delta, float softness, int field_order,
128 int *width, int *height )
130 int width_src = *width, height_src = *height;
131 int width_dest = *width, height_dest = *height;
132 mlt_image_format format_src = mlt_image_yuv422, format_dest = mlt_image_yuv422;
133 uint8_t *p_src, *p_dest;
139 format_src = mlt_image_yuv422;
140 format_dest = mlt_image_yuv422;
142 mlt_frame_get_image( a_frame, &p_dest, &format_dest, &width_dest, &height_dest, 1 );
143 mlt_frame_get_image( b_frame, &p_src, &format_src, &width_src, &height_src, 0 );
145 stride_src = width_src * 2;
146 stride_dest = width_dest * 2;
148 // Offset the position based on which field we're looking at ...
149 int32_t field_pos[ 2 ];
150 field_pos[ 0 ] = ( pos + ( ( field_order == 0 ? 1 : 0 ) * frame_delta * 0.5 ) ) * ( 1 << 16 ) * ( 1.0 + softness );
151 field_pos[ 1 ] = ( pos + ( ( field_order == 0 ? 0 : 1 ) * frame_delta * 0.5 ) ) * ( 1 << 16 ) * ( 1.0 + softness );
160 int32_t x_diff = ( luma_width << 16 ) / *width;
161 int32_t y_diff = ( luma_height << 16 ) / *height;
162 int32_t x_offset = 0;
163 int32_t y_offset = 0;
167 int32_t i_softness = softness * ( 1 << 16 );
169 int field_count = field_order <= 0 ? 1 : 2;
170 int field_stride_src = field_count * stride_src;
171 int field_stride_dest = field_count * stride_dest;
175 // composite using luma map
176 while ( field < field_count )
178 p_row = p_src + field * stride_src;
179 q_row = p_dest + field * stride_dest;
180 y_offset = ( field * luma_width ) << 16;
183 while ( i < height_src )
188 l = luma_bitmap + ( y_offset >> 16 ) * ( luma_width * field_count );
194 weight = l[ x_offset >> 16 ];
195 value = smoothstep( weight, i_softness + weight, field_pos[ field ] );
196 *o ++ = ( *p ++ * value + *q++ * ( ( 1 << 16 ) - value ) ) >> 16;
197 *o ++ = ( *p ++ * value + *q++ * ( ( 1 << 16 ) - value ) ) >> 16;
203 p_row += field_stride_src;
204 q_row += field_stride_dest;
214 static int transition_get_image( mlt_frame this, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
216 // Get the properties of the a frame
217 mlt_properties a_props = mlt_frame_properties( this );
219 // Get the b frame from the stack
220 mlt_frame b_frame = mlt_frame_pop_frame( this );
222 // Get the properties of the b frame
223 mlt_properties b_props = mlt_frame_properties( b_frame );
225 // Arbitrary composite defaults
226 float mix = mlt_properties_get_double( b_props, "image.mix" );
227 float frame_delta = mlt_properties_get_double( b_props, "luma.delta" );
228 int luma_width = mlt_properties_get_int( b_props, "luma.width" );
229 int luma_height = mlt_properties_get_int( b_props, "luma.height" );
230 uint16_t *luma_bitmap = mlt_properties_get_data( b_props, "luma.bitmap", NULL );
231 float luma_softness = mlt_properties_get_double( b_props, "luma.softness" );
232 int progressive = mlt_properties_get_int( b_props, "progressive" ) ||
233 mlt_properties_get_int( a_props, "consumer_progressive" ) ||
234 mlt_properties_get_int( b_props, "luma.progressive" );
236 int top_field_first = mlt_properties_get_int( b_props, "top_field_first" );
237 int reverse = mlt_properties_get_int( b_props, "luma.reverse" );
239 // Since we are the consumer of the b_frame, we must pass along this
240 // consumer property from the a_frame
241 mlt_properties_set_double( b_props, "consumer_aspect_ratio", mlt_properties_get_double( a_props, "consumer_aspect_ratio" ) );
242 mlt_properties_set_double( b_props, "consumer_scale", mlt_properties_get_double( a_props, "consumer_scale" ) );
244 // Honour the reverse here
245 mix = reverse ? 1 - mix : mix;
246 frame_delta *= reverse ? -1.0 : 1.0;
248 // Ensure we get scaling on the b_frame
249 mlt_properties_set( b_props, "rescale.interp", "nearest" );
251 if ( luma_width > 0 && luma_height > 0 && luma_bitmap != NULL )
252 // Composite the frames using a luma map
253 luma_composite( this, b_frame, luma_width, luma_height, luma_bitmap, mix, frame_delta,
254 luma_softness, progressive ? -1 : top_field_first, width, height );
256 // Dissolve the frames using the time offset for mix value
257 dissolve_yuv( this, b_frame, mix, *width, *height );
259 // Extract the a_frame image info
260 *width = mlt_properties_get_int( a_props, "width" );
261 *height = mlt_properties_get_int( a_props, "height" );
262 *image = mlt_properties_get_data( a_props, "image", NULL );
267 /** Load the luma map from PGM stream.
270 static void luma_read_pgm( FILE *f, uint16_t **map, int *width, int *height )
272 uint8_t *data = NULL;
283 // get the magic code
284 if ( fgets( line, 127, f ) == NULL )
286 if ( line[0] != 'P' || line[1] != '5' )
289 // skip white space and see if a new line must be fetched
290 for ( i = 2; i < 127 && line[i] != '\0' && isspace( line[i] ); i++ );
291 if ( line[i] == '\0' && fgets( line, 127, f ) == NULL )
294 // get the dimensions
295 if ( line[0] == 'P' )
296 i = sscanf( line, "P5 %d %d %d", width, height, &maxval );
298 i = sscanf( line, "%d %d %d", width, height, &maxval );
300 // get the height value, if not yet
303 if ( fgets( line, 127, f ) == NULL )
305 i = sscanf( line, "%d", height );
312 // get the maximum gray value, if not yet
315 if ( fgets( line, 127, f ) == NULL )
317 i = sscanf( line, "%d", &maxval );
322 // determine if this is one or two bytes per pixel
323 bpp = maxval > 255 ? 2 : 1;
325 // allocate temporary storage for the raw data
326 data = mlt_pool_alloc( *width * *height * bpp );
331 if ( fread( data, *width * *height * bpp, 1, f ) != 1 )
334 // allocate the luma bitmap
335 *map = p = (uint16_t*)mlt_pool_alloc( *width * *height * sizeof( uint16_t ) );
339 // proces the raw data into the luma bitmap
340 for ( i = 0; i < *width * *height * bpp; i += bpp )
343 *p++ = data[ i ] << 8;
345 *p++ = ( data[ i ] << 8 ) + data[ i+1 ];
352 mlt_pool_release( data );
356 /** Luma transition processing.
359 static mlt_frame transition_process( mlt_transition transition, mlt_frame a_frame, mlt_frame b_frame )
361 transition_luma *this = (transition_luma*) transition->child;
363 // Get the properties of the transition
364 mlt_properties properties = mlt_transition_properties( transition );
366 // Get the properties of the b frame
367 mlt_properties b_props = mlt_frame_properties( b_frame );
369 // If the filename property changed, reload the map
370 char *lumafile = mlt_properties_get( properties, "resource" );
371 if ( this->bitmap == NULL && lumafile != NULL )
373 FILE *pipe = fopen( lumafile, "r" );
376 luma_read_pgm( pipe, &this->bitmap, &this->width, &this->height );
381 // Set the b frame properties
382 mlt_properties_set_double( b_props, "image.mix", position_calculate( transition, b_frame ) );
383 mlt_properties_set_double( b_props, "luma.delta", delta_calculate( transition, b_frame ) );
384 mlt_properties_set_int( b_props, "luma.width", this->width );
385 mlt_properties_set_int( b_props, "luma.height", this->height );
386 mlt_properties_set_data( b_props, "luma.bitmap", this->bitmap, 0, NULL, NULL );
387 mlt_properties_set_int( b_props, "luma.reverse", mlt_properties_get_int( properties, "reverse" ) );
388 mlt_properties_set_double( b_props, "luma.softness", mlt_properties_get_double( properties, "softness" ) );
390 mlt_frame_push_get_image( a_frame, transition_get_image );
391 mlt_frame_push_frame( a_frame, b_frame );
396 /** Constructor for the filter.
399 mlt_transition transition_luma_init( char *lumafile )
401 transition_luma *this = calloc( sizeof( transition_luma ), 1 );
404 mlt_transition transition = &this->parent;
405 mlt_transition_init( transition, this );
406 transition->process = transition_process;
407 transition->close = transition_close;
408 mlt_properties_set( mlt_transition_properties( transition ), "resource", lumafile );
409 return &this->parent;
414 /** Close the transition.
417 static void transition_close( mlt_transition parent )
419 transition_luma *this = (transition_luma*) parent->child;
420 mlt_pool_release( this->bitmap );