1 /*****************************************************************************
2 * rotate.c : video rotation filter
3 *****************************************************************************
4 * Copyright (C) 2000-2008 the VideoLAN team
7 * Authors: Antoine Cellerier <dionoea -at- videolan -dot- org>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program 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
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
22 *****************************************************************************/
24 /*****************************************************************************
26 *****************************************************************************/
32 #include <math.h> /* sin(), cos() */
34 #include <vlc_common.h>
35 #include <vlc_plugin.h>
37 #include <vlc_filter.h>
38 #include "filter_picture.h"
40 /*****************************************************************************
42 *****************************************************************************/
43 static int Create ( vlc_object_t * );
44 static void Destroy ( vlc_object_t * );
46 static picture_t *Filter( filter_t *, picture_t * );
47 static picture_t *FilterPacked( filter_t *, picture_t * );
49 static int RotateCallback( vlc_object_t *p_this, char const *psz_var,
50 vlc_value_t oldval, vlc_value_t newval,
53 static int PreciseRotateCallback( vlc_object_t *p_this, char const *psz_var,
54 vlc_value_t oldval, vlc_value_t newval,
57 #define ANGLE_TEXT N_("Angle in degrees")
58 #define ANGLE_LONGTEXT N_("Angle in degrees (0 to 359)")
60 #define FILTER_PREFIX "rotate-"
62 /*****************************************************************************
64 *****************************************************************************/
66 set_description( N_("Rotate video filter") )
67 set_shortname( N_( "Rotate" ))
68 set_capability( "video filter2", 0 )
69 set_category( CAT_VIDEO )
70 set_subcategory( SUBCAT_VIDEO_VFILTER )
72 add_integer_with_range( FILTER_PREFIX "angle", 30, 0, 359, NULL,
73 ANGLE_TEXT, ANGLE_LONGTEXT, false )
75 add_shortcut( "rotate" )
76 set_callbacks( Create, Destroy )
79 static const char *const ppsz_filter_options[] = {
83 /*****************************************************************************
85 *****************************************************************************/
93 static inline void cache_trigo( int i_angle, int *i_sin, int *i_cos )
95 const double f_angle = (((double)i_angle)*M_PI)/1800.;
96 *i_sin = (int)(sin( f_angle )*4096.);
97 *i_cos = (int)(cos( f_angle )*4096.);
100 /*****************************************************************************
101 * Create: allocates Distort video filter
102 *****************************************************************************/
103 static int Create( vlc_object_t *p_this )
105 filter_t *p_filter = (filter_t *)p_this;
108 if( p_filter->fmt_in.video.i_chroma != p_filter->fmt_out.video.i_chroma )
110 msg_Err( p_filter, "Input and output chromas don't match" );
114 switch( p_filter->fmt_in.video.i_chroma )
117 p_filter->pf_video_filter = Filter;
121 p_filter->pf_video_filter = FilterPacked;
125 msg_Err( p_filter, "Unsupported input chroma (%4.4s)",
126 (char*)&(p_filter->fmt_in.video.i_chroma) );
130 /* Allocate structure */
131 p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
132 if( p_filter->p_sys == NULL )
134 p_sys = p_filter->p_sys;
136 config_ChainParse( p_filter, FILTER_PREFIX, ppsz_filter_options,
139 int i_angle = var_CreateGetIntegerCommand( p_filter,
140 FILTER_PREFIX "angle" ) * 10;
141 cache_trigo( i_angle, &p_sys->i_sin, &p_sys->i_cos );
142 var_Create( p_filter, FILTER_PREFIX "deciangle",
143 VLC_VAR_INTEGER|VLC_VAR_ISCOMMAND );
144 vlc_spin_init( &p_sys->lock );
145 var_AddCallback( p_filter, FILTER_PREFIX "angle", RotateCallback, p_sys );
146 var_AddCallback( p_filter, FILTER_PREFIX "deciangle",
147 PreciseRotateCallback, p_sys );
152 /*****************************************************************************
153 * Destroy: destroy Distort filter
154 *****************************************************************************/
155 static void Destroy( vlc_object_t *p_this )
157 filter_t *p_filter = (filter_t *)p_this;
159 var_DelCallback( p_filter, FILTER_PREFIX "angle", RotateCallback, p_filter->p_sys );
160 var_DelCallback( p_filter, FILTER_PREFIX "deciangle",
161 PreciseRotateCallback, p_filter->p_sys );
162 vlc_spin_destroy( &p_filter->p_sys->lock );
163 free( p_filter->p_sys );
166 /*****************************************************************************
168 *****************************************************************************/
169 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
172 filter_sys_t *p_sys = p_filter->p_sys;
174 if( !p_pic ) return NULL;
176 p_outpic = filter_NewPicture( p_filter );
179 picture_Release( p_pic );
183 vlc_spin_lock( &p_sys->lock );
184 const int i_sin = p_sys->i_sin;
185 const int i_cos = p_sys->i_cos;
186 vlc_spin_unlock( &p_sys->lock );
188 for( int i_plane = 0 ; i_plane < p_pic->i_planes ; i_plane++ )
190 plane_t *p_srcp = &p_pic->p[i_plane];
191 plane_t *p_dstp = &p_outpic->p[i_plane];
193 const int i_visible_lines = p_srcp->i_visible_lines;
194 const int i_visible_pitch = p_srcp->i_visible_pitch;
196 const int i_aspect = __MAX( 1, ( i_visible_lines * p_pic->p[Y_PLANE].i_visible_pitch ) / ( p_pic->p[Y_PLANE].i_visible_lines * i_visible_pitch ));
197 /* = 2 for U and V planes in YUV 4:2:2, = 1 otherwise */
199 const int i_line_center = i_visible_lines>>1;
200 const int i_col_center = i_visible_pitch>>1;
202 const uint8_t black_pixel = ( i_plane == Y_PLANE ) ? 0x00 : 0x80;
204 const int i_line_next = i_cos / i_aspect -i_sin*i_visible_pitch;
205 const int i_col_next = -i_sin / i_aspect -i_cos*i_visible_pitch;
206 int i_line_orig0 = ( - i_cos * i_line_center / i_aspect
207 - i_sin * i_col_center + (1<<11) );
208 int i_col_orig0 = i_sin * i_line_center / i_aspect
209 - i_cos * i_col_center + (1<<11);
210 for( int y = 0; y < i_visible_lines; y++)
212 uint8_t *p_out = &p_dstp->p_pixels[y * p_dstp->i_pitch];
214 for( int x = 0; x < i_visible_pitch; x++, p_out++ )
216 const int i_line_orig = (i_line_orig0>>12)*i_aspect + i_line_center;
217 const int i_col_orig = (i_col_orig0>>12) + i_col_center;
218 const uint8_t *p_orig_offset = &p_srcp->p_pixels[i_line_orig * p_srcp->i_pitch + i_col_orig];
219 const uint8_t i_line_percent = (i_line_orig0>>4) & 255;
220 const uint8_t i_col_percent = (i_col_orig0 >>4) & 255;
222 if( -1 <= i_line_orig && i_line_orig < i_visible_lines
223 && -1 <= i_col_orig && i_col_orig < i_visible_pitch )
228 if( ( i_col_orig > i_visible_pitch/2 ) )
231 uint8_t i_curpix = black_pixel;
232 uint8_t i_colpix = black_pixel;
233 uint8_t i_linpix = black_pixel;
234 uint8_t i_nexpix = black_pixel;
235 if( ( 0 <= i_line_orig ) && ( 0 <= i_col_orig ) )
236 i_curpix = *p_orig_offset;
239 if( ( i_col_orig < i_visible_pitch - 1)
240 && ( i_line_orig >= 0 ) )
241 i_colpix = *p_orig_offset;
243 p_orig_offset += p_srcp->i_pitch;
244 if( ( i_line_orig < i_visible_lines - 1)
245 && ( i_col_orig < i_visible_pitch - 1) )
246 i_nexpix = *p_orig_offset;
249 if( ( i_line_orig < i_visible_lines - 1)
250 && ( i_col_orig >= 0 ) )
251 i_linpix = *p_orig_offset;
253 unsigned int temp = 0;
255 (256 - i_line_percent) * ( 256 - i_col_percent );
257 i_line_percent * (256 - i_col_percent );
259 ( i_col_percent) * ( i_line_percent);
261 i_col_percent * (256 - i_line_percent );
265 else if (i_col_orig == i_visible_pitch/2 )
266 { *p_out = black_pixel;
269 *p_out = *p_orig_offset;
275 *p_out = black_pixel;
278 i_line_orig0 += i_sin;
279 i_col_orig0 += i_cos;
282 i_line_orig0 += i_line_next;
283 i_col_orig0 += i_col_next;
287 return CopyInfoAndRelease( p_outpic, p_pic );
290 /*****************************************************************************
292 *****************************************************************************/
293 static picture_t *FilterPacked( filter_t *p_filter, picture_t *p_pic )
296 filter_sys_t *p_sys = p_filter->p_sys;
298 if( !p_pic ) return NULL;
300 int i_u_offset, i_v_offset, i_y_offset;
302 if( GetPackedYuvOffsets( p_pic->format.i_chroma, &i_y_offset,
303 &i_u_offset, &i_v_offset ) != VLC_SUCCESS )
305 msg_Warn( p_filter, "Unsupported input chroma (%4.4s)",
306 (char*)&(p_pic->format.i_chroma) );
307 picture_Release( p_pic );
311 p_outpic = filter_NewPicture( p_filter );
314 picture_Release( p_pic );
318 const int i_visible_pitch = p_pic->p->i_visible_pitch>>1; /* In fact it's i_visible_pixels */
319 const int i_visible_lines = p_pic->p->i_visible_lines;
321 const uint8_t *p_in = p_pic->p->p_pixels+i_y_offset;
322 const uint8_t *p_in_u = p_pic->p->p_pixels+i_u_offset;
323 const uint8_t *p_in_v = p_pic->p->p_pixels+i_v_offset;
324 const int i_in_pitch = p_pic->p->i_pitch;
326 uint8_t *p_out = p_outpic->p->p_pixels+i_y_offset;
327 uint8_t *p_out_u = p_outpic->p->p_pixels+i_u_offset;
328 uint8_t *p_out_v = p_outpic->p->p_pixels+i_v_offset;
329 const int i_out_pitch = p_outpic->p->i_pitch;
331 const int i_line_center = i_visible_lines>>1;
332 const int i_col_center = i_visible_pitch>>1;
334 vlc_spin_lock( &p_sys->lock );
335 const int i_sin = p_sys->i_sin;
336 const int i_cos = p_sys->i_cos;
337 vlc_spin_unlock( &p_sys->lock );
340 for( i_line = 0; i_line < i_visible_lines; i_line++ )
342 for( i_col = 0; i_col < i_visible_pitch; i_col++ )
346 /* Handle "1st Y", U and V */
347 i_line_orig = i_line_center +
348 ( ( i_sin * ( i_col - i_col_center )
349 + i_cos * ( i_line - i_line_center ) )>>12 );
350 i_col_orig = i_col_center +
351 ( ( i_cos * ( i_col - i_col_center )
352 - i_sin * ( i_line - i_line_center ) )>>12 );
353 if( 0 <= i_col_orig && i_col_orig < i_visible_pitch
354 && 0 <= i_line_orig && i_line_orig < i_visible_lines )
356 p_out[i_line*i_out_pitch+2*i_col] = p_in[i_line_orig*i_in_pitch+2*i_col_orig];
358 p_out_u[i_line*i_out_pitch+2*i_col] = p_in_u[i_line_orig*i_in_pitch+4*i_col_orig];
359 p_out_v[i_line*i_out_pitch+2*i_col] = p_in_v[i_line_orig*i_in_pitch+4*i_col_orig];
363 p_out[i_line*i_out_pitch+2*i_col] = 0x00;
364 p_out_u[i_line*i_out_pitch+2*i_col] = 0x80;
365 p_out_v[i_line*i_out_pitch+2*i_col] = 0x80;
370 if( i_col >= i_visible_pitch )
373 i_line_orig = i_line_center +
374 ( ( i_sin * ( i_col - i_col_center )
375 + i_cos * ( i_line - i_line_center ) )>>12 );
376 i_col_orig = i_col_center +
377 ( ( i_cos * ( i_col - i_col_center )
378 - i_sin * ( i_line - i_line_center ) )>>12 );
379 if( 0 <= i_col_orig && i_col_orig < i_visible_pitch
380 && 0 <= i_line_orig && i_line_orig < i_visible_lines )
382 p_out[i_line*i_out_pitch+2*i_col] = p_in[i_line_orig*i_in_pitch+2*i_col_orig];
386 p_out[i_line*i_out_pitch+2*i_col] = 0x00;
391 return CopyInfoAndRelease( p_outpic, p_pic );
394 /*****************************************************************************
395 * Angle modification callbacks.
396 *****************************************************************************/
397 static int RotateCallback( vlc_object_t *p_this, char const *psz_var,
398 vlc_value_t oldval, vlc_value_t newval,
403 return PreciseRotateCallback( p_this, psz_var, oldval, newval, p_data );
406 static int PreciseRotateCallback( vlc_object_t *p_this, char const *psz_var,
407 vlc_value_t oldval, vlc_value_t newval,
410 VLC_UNUSED(p_this); VLC_UNUSED(psz_var); VLC_UNUSED(oldval);
411 filter_sys_t *p_sys = (filter_sys_t *)p_data;
414 cache_trigo( newval.i_int, &i_sin, &i_cos );
415 vlc_spin_lock( &p_sys->lock );
416 p_sys->i_sin = i_sin;
417 p_sys->i_cos = i_cos;
418 vlc_spin_unlock( &p_sys->lock );