Rotate: no need to remember the angle
[vlc.git] / modules / video_filter / rotate.c
1 /*****************************************************************************
2  * rotate.c : video rotation filter
3  *****************************************************************************
4  * Copyright (C) 2000-2008 the VideoLAN team
5  * $Id$
6  *
7  * Authors: Antoine Cellerier <dionoea -at- videolan -dot- org>
8  *
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.
13  *
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.
18  *
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  *****************************************************************************/
23
24 /*****************************************************************************
25  * Preamble
26  *****************************************************************************/
27
28 #ifdef HAVE_CONFIG_H
29 # include "config.h"
30 #endif
31
32 #include <math.h>                                            /* sin(), cos() */
33
34 #include <vlc_common.h>
35 #include <vlc_plugin.h>
36 #include <vlc_vout.h>
37
38 #include "vlc_filter.h"
39 #include "filter_picture.h"
40
41 /*****************************************************************************
42  * Local prototypes
43  *****************************************************************************/
44 static int  Create    ( vlc_object_t * );
45 static void Destroy   ( vlc_object_t * );
46
47 static picture_t *Filter( filter_t *, picture_t * );
48 static picture_t *FilterPacked( filter_t *, picture_t * );
49
50 static int RotateCallback( vlc_object_t *p_this, char const *psz_var,
51                            vlc_value_t oldval, vlc_value_t newval,
52                            void *p_data );
53
54 static int PreciseRotateCallback( vlc_object_t *p_this, char const *psz_var,
55                            vlc_value_t oldval, vlc_value_t newval,
56                            void *p_data );
57
58 #define ANGLE_TEXT N_("Angle in degrees")
59 #define ANGLE_LONGTEXT N_("Angle in degrees (0 to 359)")
60
61 #define FILTER_PREFIX "rotate-"
62
63 /*****************************************************************************
64  * Module descriptor
65  *****************************************************************************/
66 vlc_module_begin ()
67     set_description( N_("Rotate video filter") )
68     set_shortname( N_( "Rotate" ))
69     set_capability( "video filter2", 0 )
70     set_category( CAT_VIDEO )
71     set_subcategory( SUBCAT_VIDEO_VFILTER )
72
73     add_integer_with_range( FILTER_PREFIX "angle", 30, 0, 359, NULL,
74         ANGLE_TEXT, ANGLE_LONGTEXT, false )
75
76     add_shortcut( "rotate" )
77     set_callbacks( Create, Destroy )
78 vlc_module_end ()
79
80 static const char *const ppsz_filter_options[] = {
81     "angle", NULL
82 };
83
84 /*****************************************************************************
85  * filter_sys_t
86  *****************************************************************************/
87 struct filter_sys_t
88 {
89     int     i_cos;
90     int     i_sin;
91 };
92
93 static inline void cache_trigo( int i_angle, int *i_sin, int *i_cos )
94 {
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.);
98 }
99
100 /*****************************************************************************
101  * Create: allocates Distort video filter
102  *****************************************************************************/
103 static int Create( vlc_object_t *p_this )
104 {
105     filter_t *p_filter = (filter_t *)p_this;
106     filter_sys_t *p_sys;
107
108     if( p_filter->fmt_in.video.i_chroma != p_filter->fmt_out.video.i_chroma )
109     {
110         msg_Err( p_filter, "Input and output chromas don't match" );
111         return VLC_EGENERIC;
112     }
113
114     switch( p_filter->fmt_in.video.i_chroma )
115     {
116         CASE_PLANAR_YUV
117             p_filter->pf_video_filter = Filter;
118             break;
119
120         CASE_PACKED_YUV_422
121             p_filter->pf_video_filter = FilterPacked;
122             break;
123
124         default:
125             msg_Err( p_filter, "Unsupported input chroma (%4s)",
126                      (char*)&(p_filter->fmt_in.video.i_chroma) );
127             return VLC_EGENERIC;
128     }
129
130     /* Allocate structure */
131     p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
132     if( p_filter->p_sys == NULL )
133         return VLC_ENOMEM;
134     p_sys = p_filter->p_sys;
135
136     config_ChainParse( p_filter, FILTER_PREFIX, ppsz_filter_options,
137                        p_filter->p_cfg );
138
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     var_AddCallback( p_filter, FILTER_PREFIX "angle", RotateCallback, p_sys );
145     var_AddCallback( p_filter, FILTER_PREFIX "deciangle",
146                      PreciseRotateCallback, p_sys );
147
148
149     return VLC_SUCCESS;
150 }
151
152 /*****************************************************************************
153  * Destroy: destroy Distort filter
154  *****************************************************************************/
155 static void Destroy( vlc_object_t *p_this )
156 {
157     filter_t *p_filter = (filter_t *)p_this;
158
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
163     free( p_filter->p_sys );
164 }
165
166 /*****************************************************************************
167  *
168  *****************************************************************************/
169 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
170 {
171     picture_t *p_outpic;
172     filter_sys_t *p_sys = p_filter->p_sys;
173     int i_plane;
174     const int i_sin = p_sys->i_sin, i_cos = p_sys->i_cos;
175
176     if( !p_pic ) return NULL;
177
178     p_outpic = filter_NewPicture( p_filter );
179     if( !p_outpic )
180     {
181         picture_Release( p_pic );
182         return NULL;
183     }
184
185     for( i_plane = 0 ; i_plane < p_pic->i_planes ; i_plane++ )
186     {
187         const int i_visible_lines = p_pic->p[i_plane].i_visible_lines;
188         const int i_visible_pitch = p_pic->p[i_plane].i_visible_pitch;
189         const int i_pitch         = p_pic->p[i_plane].i_pitch;
190         const int i_hidden_pitch  = i_pitch - i_visible_pitch;
191
192         const int i_aspect = ( i_visible_lines * p_pic->p[Y_PLANE].i_visible_pitch ) / ( p_pic->p[Y_PLANE].i_visible_lines * i_visible_pitch );
193         /* = 2 for U and V planes in YUV 4:2:2, = 1 otherwise */
194
195         const int i_line_center = i_visible_lines>>1;
196         const int i_col_center  = i_visible_pitch>>1;
197
198         const uint8_t *p_in = p_pic->p[i_plane].p_pixels;
199         uint8_t *p_out = p_outpic->p[i_plane].p_pixels;
200         uint8_t *p_outendline = p_out + i_visible_pitch;
201         const uint8_t *p_outend = p_out + i_visible_lines * i_pitch;
202
203         const uint8_t black_pixel = ( i_plane == Y_PLANE ) ? 0x00 : 0x80;
204
205         const int i_line_next =  i_cos / i_aspect -i_sin*i_visible_pitch;
206         const int i_col_next  = -i_sin / i_aspect -i_cos*i_visible_pitch;
207         int i_line_orig0 = ( - i_cos * i_line_center / i_aspect
208                              - i_sin * i_col_center + (1<<11) );
209         int i_col_orig0 =    i_sin * i_line_center / i_aspect
210                            - i_cos * i_col_center + (1<<11);
211         for( ; p_outendline < p_outend;
212              p_out += i_hidden_pitch, p_outendline += i_pitch,
213              i_line_orig0 += i_line_next, i_col_orig0 += i_col_next )
214         {
215             for( ; p_out < p_outendline;
216                  p_out++, i_line_orig0 += i_sin, i_col_orig0 += i_cos )
217             {
218                 const int i_line_orig = (i_line_orig0>>12)*i_aspect + i_line_center;
219                 const int i_col_orig  = (i_col_orig0>>12)  + i_col_center;
220                 const uint8_t* p_orig_offset = p_in + i_line_orig * i_pitch
221                                                 + i_col_orig;
222                 const uint8_t i_line_percent = (i_line_orig0>>4) & 255;
223                 const uint8_t i_col_percent  = (i_col_orig0 >>4) & 255;
224
225                 if(    -1 <= i_line_orig && i_line_orig < i_visible_lines
226                     && -1 <= i_col_orig  && i_col_orig  < i_visible_pitch )
227                 {
228                 #define test 1
229                 #undef test
230                 #ifdef test
231                     if( ( i_col_orig > i_visible_pitch/2 ) )
232                 #endif
233                     {
234                         uint8_t i_curpix = black_pixel;
235                         uint8_t i_colpix = black_pixel;
236                         uint8_t i_linpix = black_pixel;
237                         uint8_t i_nexpix = black_pixel;
238                         if( ( 0 <= i_line_orig ) && ( 0 <= i_col_orig ) )
239                             i_curpix = *p_orig_offset;
240                         p_orig_offset++;
241
242                         if(  ( i_col_orig < i_visible_pitch - 1)
243                              && ( i_line_orig >= 0 ) )
244                             i_colpix = *p_orig_offset;
245
246                         p_orig_offset+=i_pitch;
247                         if( ( i_line_orig < i_visible_lines - 1)
248                             && ( i_col_orig  < i_visible_pitch - 1) )
249                             i_nexpix = *p_orig_offset;
250
251                         p_orig_offset--;
252                         if(  ( i_line_orig < i_visible_lines - 1)
253                              && ( i_col_orig >= 0 ) )
254                             i_linpix = *p_orig_offset;
255
256                         unsigned int temp = 0;
257                         temp+= i_curpix *
258                             (256 - i_line_percent) * ( 256 - i_col_percent );
259                         temp+= i_linpix *
260                             i_line_percent * (256 - i_col_percent );
261                         temp+= i_nexpix *
262                             ( i_col_percent) * ( i_line_percent);
263                         temp+= i_colpix *
264                             i_col_percent * (256 - i_line_percent );
265                         *p_out = temp >> 16;
266                     }
267                 #ifdef test
268                     else if (i_col_orig == i_visible_pitch/2 )
269                     {   *p_out = black_pixel;
270                     }
271                     else
272                         *p_out = *p_orig_offset;
273                 #endif
274                 #undef test
275                 }
276                 else
277                 {
278                     *p_out = black_pixel;
279                 }
280             }
281         }
282     }
283
284     return CopyInfoAndRelease( p_outpic, p_pic );
285 }
286
287 /*****************************************************************************
288  *
289  *****************************************************************************/
290 static picture_t *FilterPacked( filter_t *p_filter, picture_t *p_pic )
291 {
292     picture_t *p_outpic;
293     filter_sys_t *p_sys = p_filter->p_sys;
294     const int i_sin = p_sys->i_sin, i_cos = p_sys->i_cos;
295
296     if( !p_pic ) return NULL;
297
298     int i_u_offset, i_v_offset, i_y_offset;
299
300     if( GetPackedYuvOffsets( p_pic->format.i_chroma, &i_y_offset,
301                              &i_u_offset, &i_v_offset ) != VLC_SUCCESS )
302     {
303         msg_Warn( p_filter, "Unsupported input chroma (%4s)",
304                   (char*)&(p_pic->format.i_chroma) );
305         picture_Release( p_pic );
306         return NULL;
307     }
308
309     p_outpic = filter_NewPicture( p_filter );
310     if( !p_outpic )
311     {
312         picture_Release( p_pic );
313         return NULL;
314     }
315
316     const uint8_t *p_in   = p_pic->p->p_pixels+i_y_offset;
317     const uint8_t *p_in_u = p_pic->p->p_pixels+i_u_offset;
318     const uint8_t *p_in_v = p_pic->p->p_pixels+i_v_offset;
319
320     const int i_pitch         = p_pic->p->i_pitch;
321     const int i_visible_pitch = p_pic->p->i_visible_pitch>>1; /* In fact it's i_visible_pixels */
322     const int i_visible_lines = p_pic->p->i_visible_lines;
323
324     uint8_t *p_out   = p_outpic->p->p_pixels+i_y_offset;
325     uint8_t *p_out_u = p_outpic->p->p_pixels+i_u_offset;
326     uint8_t *p_out_v = p_outpic->p->p_pixels+i_v_offset;
327
328     const int i_line_center = i_visible_lines>>1;
329     const int i_col_center  = i_visible_pitch>>1;
330
331     int i_col, i_line;
332     for( i_line = 0; i_line < i_visible_lines; i_line++ )
333     {
334         for( i_col = 0; i_col < i_visible_pitch; i_col++ )
335         {
336             int i_line_orig;
337             int i_col_orig;
338             /* Handle "1st Y", U and V */
339             i_line_orig = i_line_center +
340                 ( ( i_sin * ( i_col - i_col_center )
341                   + i_cos * ( i_line - i_line_center ) )>>12 );
342             i_col_orig = i_col_center +
343                 ( ( i_cos * ( i_col - i_col_center )
344                   - i_sin * ( i_line - i_line_center ) )>>12 );
345             if( 0 <= i_col_orig && i_col_orig < i_visible_pitch
346              && 0 <= i_line_orig && i_line_orig < i_visible_lines )
347             {
348                 p_out[i_line*i_pitch+2*i_col] = p_in[i_line_orig*i_pitch+2*i_col_orig];
349                 i_col_orig /= 2;
350                 p_out_u[i_line*i_pitch+2*i_col] = p_in_u[i_line_orig*i_pitch+4*i_col_orig];
351                 p_out_v[i_line*i_pitch+2*i_col] = p_in_v[i_line_orig*i_pitch+4*i_col_orig];
352             }
353             else
354             {
355                 p_out[i_line*i_pitch+2*i_col] = 0x00;
356                 p_out_u[i_line*i_pitch+2*i_col] = 0x80;
357                 p_out_v[i_line*i_pitch+2*i_col] = 0x80;
358             }
359
360             /* Handle "2nd Y" */
361             i_col++;
362             if( i_col >= i_visible_pitch )
363                 break;
364
365             i_line_orig = i_line_center +
366                 ( ( i_sin * ( i_col - i_col_center )
367                   + i_cos * ( i_line - i_line_center ) )>>12 );
368             i_col_orig = i_col_center +
369                 ( ( i_cos * ( i_col - i_col_center )
370                   - i_sin * ( i_line - i_line_center ) )>>12 );
371             if( 0 <= i_col_orig && i_col_orig < i_visible_pitch
372              && 0 <= i_line_orig && i_line_orig < i_visible_lines )
373             {
374                 p_out[i_line*i_pitch+2*i_col] = p_in[i_line_orig*i_pitch+2*i_col_orig];
375             }
376             else
377             {
378                 p_out[i_line*i_pitch+2*i_col] = 0x00;
379             }
380         }
381     }
382
383     return CopyInfoAndRelease( p_outpic, p_pic );
384 }
385
386 /*****************************************************************************
387  * Angle modification callbacks.
388  *****************************************************************************/
389 static int RotateCallback( vlc_object_t *p_this, char const *psz_var,
390                            vlc_value_t oldval, vlc_value_t newval,
391                            void *p_data )
392 {
393     VLC_UNUSED(p_this); VLC_UNUSED(psz_var); VLC_UNUSED(oldval);
394     filter_sys_t *p_sys = (filter_sys_t *)p_data;
395
396     cache_trigo( newval.i_int * 10, &p_sys->i_sin, &p_sys->i_cos );
397     return VLC_SUCCESS;
398 }
399
400 static int PreciseRotateCallback( vlc_object_t *p_this, char const *psz_var,
401                            vlc_value_t oldval, vlc_value_t newval,
402                            void *p_data )
403 {
404     VLC_UNUSED(p_this); VLC_UNUSED(psz_var); VLC_UNUSED(oldval);
405     filter_sys_t *p_sys = (filter_sys_t *)p_data;
406
407     cache_trigo( newval.i_int, &p_sys->i_sin, &p_sys->i_cos );
408     return VLC_SUCCESS;
409 }