* ALL: converted the video output module "picture" to a stream output
[vlc.git] / modules / video_filter / mosaic.c
1 /*****************************************************************************
2  * mosaic.c : Mosaic video plugin for vlc
3  *****************************************************************************
4  * Copyright (C) 2004-2005 VideoLAN
5  * $Id$
6  *
7  * Authors: Antoine Cellerier <dionoea@via.ecp.fr>
8  *          Christophe Massiot <massiot@via.ecp.fr>
9  *
10  * This program is free software; you can redistribute it and/or modify
11  * it under the terms of the GNU General Public License as published by
12  * the Free Software Foundation; either version 2 of the License, or
13  * (at your option) any later version.
14  *
15  * This program is distributed in the hope that it will be useful,
16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18  * GNU General Public License for more details.
19  *
20  * You should have received a copy of the GNU General Public License
21  * along with this program; if not, write to the Free Software
22  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
23 *****************************************************************************/
24
25 /*****************************************************************************
26  * Preamble
27  *****************************************************************************/
28 #include <stdlib.h>                                      /* malloc(), free() */
29 #include <string.h>
30 #include <math.h>
31
32 #include <vlc/vlc.h>
33 #include <vlc/vout.h>
34
35 #ifdef HAVE_LIMITS_H
36 #   include <limits.h> /* INT_MAX */
37 #endif
38
39 #include "vlc_filter.h"
40 #include "vlc_image.h"
41
42 #include "mosaic.h"
43
44 #define BLANK_DELAY I64C(1000000)
45
46 /*****************************************************************************
47  * Local prototypes
48  *****************************************************************************/
49 static int  CreateFilter    ( vlc_object_t * );
50 static void DestroyFilter   ( vlc_object_t * );
51
52 static subpicture_t *Filter( filter_t *, mtime_t );
53
54 static int MosaicCallback( vlc_object_t *, char const *, vlc_value_t,
55                            vlc_value_t, void * );
56
57 /*****************************************************************************
58  * filter_sys_t : filter descriptor
59  *****************************************************************************/
60 struct filter_sys_t
61 {
62     vlc_mutex_t lock;
63     vlc_mutex_t *p_lock;
64
65     image_handler_t *p_image;
66     picture_t *p_pic;
67
68     int i_position; /* mosaic positioning method */
69     vlc_bool_t b_ar; /* do we keep the aspect ratio ? */
70     vlc_bool_t b_keep; /* do we keep the original picture format ? */
71     int i_width, i_height; /* mosaic height and width */
72     int i_cols, i_rows; /* mosaic rows and cols */
73     int i_align; /* mosaic alignment in background video */
74     int i_xoffset, i_yoffset; /* top left corner offset */
75     int i_vborder, i_hborder; /* border width/height between miniatures */
76     int i_alpha; /* subfilter alpha blending */
77
78     char **ppsz_order; /* list of picture-id */
79     int i_order_length;
80
81     mtime_t i_delay;
82 };
83
84 /*****************************************************************************
85  * Module descriptor
86  *****************************************************************************/
87 #define ALPHA_TEXT N_("Alpha blending")
88 #define ALPHA_LONGTEXT N_("Alpha blending (0 -> 255). Default is 255")
89
90 #define HEIGHT_TEXT N_("Height in pixels")
91 #define WIDTH_TEXT N_("Width in pixels")
92 #define XOFFSET_TEXT N_("Top left corner x coordinate")
93 #define YOFFSET_TEXT N_("Top left corner y coordinate")
94 #define VBORDER_TEXT N_("Vertical border width in pixels")
95 #define HBORDER_TEXT N_("Horizontal border width in pixels")
96 #define ALIGN_TEXT N_("Mosaic alignment")
97
98 #define POS_TEXT N_("Positioning method")
99 #define POS_LONGTEXT N_("Positioning method. auto : automatically choose " \
100         "the best number of rows and columns. fixed : use the user-defined " \
101         "number of rows and columns.")
102 #define ROWS_TEXT N_("Number of rows")
103 #define COLS_TEXT N_("Number of columns")
104 #define AR_TEXT N_("Keep aspect ratio when resizing")
105 #define KEEP_TEXT N_("Keep original size")
106
107 #define ORDER_TEXT N_("Order as a comma separated list of picture-id(s)")
108
109 #define DELAY_TEXT N_("Delay")
110 #define DELAY_LONGTEXT N_("Pictures coming from the picture video outputs " \
111         "will be delayed accordingly (in milliseconds). For high " \
112         "values you will need to raise file-caching and others.")
113
114 static int pi_pos_values[] = { 0, 1 };
115 static char * ppsz_pos_descriptions[] =
116 { N_("auto"), N_("fixed") };
117
118 static int pi_align_values[] = { 0, 1, 2, 4, 8, 5, 6, 9, 10 };
119 static char *ppsz_align_descriptions[] =
120      { N_("Center"), N_("Left"), N_("Right"), N_("Top"), N_("Bottom"),
121      N_("Top-Left"), N_("Top-Right"), N_("Bottom-Left"), N_("Bottom-Right") };
122
123
124 vlc_module_begin();
125     set_description( N_("Mosaic video sub filter") );
126     set_shortname( N_("Mosaic") );
127     set_capability( "sub filter", 0 );
128     set_callbacks( CreateFilter, DestroyFilter );
129
130     add_integer( "mosaic-alpha", 255, NULL, ALPHA_TEXT, ALPHA_LONGTEXT, VLC_FALSE );
131     add_integer( "mosaic-height", 100, NULL, HEIGHT_TEXT, HEIGHT_TEXT, VLC_FALSE );
132     add_integer( "mosaic-width", 100, NULL, WIDTH_TEXT, WIDTH_TEXT, VLC_FALSE );
133     add_integer( "mosaic-align", 5, NULL, ALIGN_TEXT, ALIGN_TEXT, VLC_TRUE);
134         change_integer_list( pi_align_values, ppsz_align_descriptions, 0 );
135     add_integer( "mosaic-xoffset", 0, NULL, XOFFSET_TEXT, XOFFSET_TEXT, VLC_TRUE );
136     add_integer( "mosaic-yoffset", 0, NULL, YOFFSET_TEXT, YOFFSET_TEXT, VLC_TRUE );
137     add_integer( "mosaic-vborder", 0, NULL, VBORDER_TEXT, VBORDER_TEXT, VLC_TRUE );
138     add_integer( "mosaic-hborder", 0, NULL, HBORDER_TEXT, HBORDER_TEXT, VLC_TRUE );
139
140     add_integer( "mosaic-position", 0, NULL, POS_TEXT, POS_LONGTEXT, VLC_FALSE );
141         change_integer_list( pi_pos_values, ppsz_pos_descriptions, 0 );
142     add_integer( "mosaic-rows", 2, NULL, ROWS_TEXT, ROWS_TEXT, VLC_FALSE );
143     add_integer( "mosaic-cols", 2, NULL, COLS_TEXT, COLS_TEXT, VLC_FALSE );
144     add_bool( "mosaic-keep-aspect-ratio", 0, NULL, AR_TEXT, AR_TEXT, VLC_FALSE );
145     add_bool( "mosaic-keep-picture", 0, NULL, KEEP_TEXT, KEEP_TEXT, VLC_FALSE );
146     add_string( "mosaic-order", "", NULL, ORDER_TEXT, ORDER_TEXT, VLC_FALSE );
147
148     add_integer( "mosaic-delay", 0, NULL, DELAY_TEXT, DELAY_LONGTEXT,
149                  VLC_FALSE );
150
151     var_Create( p_module->p_libvlc, "mosaic-lock", VLC_VAR_MUTEX );
152 vlc_module_end();
153
154
155 /*****************************************************************************
156  * CreateFiler: allocate mosaic video filter
157  *****************************************************************************/
158 static int CreateFilter( vlc_object_t *p_this )
159 {
160     filter_t *p_filter = (filter_t *)p_this;
161     filter_sys_t *p_sys;
162     libvlc_t *p_libvlc = p_filter->p_libvlc;
163     char *psz_order;
164     int i_index;
165     vlc_value_t val;
166
167     /* Allocate structure */
168     p_sys = p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
169     if( p_sys == NULL )
170     {
171         msg_Err( p_filter, "out of memory" );
172         return VLC_ENOMEM;
173     }
174
175     p_filter->pf_sub_filter = Filter;
176     p_sys->p_pic = NULL;
177
178     vlc_mutex_init( p_filter, &p_sys->lock );
179     vlc_mutex_lock( &p_sys->lock );
180
181     var_Get( p_libvlc, "mosaic-lock", &val );
182     p_sys->p_lock = val.p_address;
183
184 #define GET_VAR( name, min, max )                                           \
185     p_sys->i_##name = __MIN( max, __MAX( min,                               \
186                 var_CreateGetInteger( p_filter, "mosaic-" #name ) ) );      \
187     var_Destroy( p_filter, "mosaic-" #name );                               \
188     var_Create( p_libvlc, "mosaic-" #name, VLC_VAR_INTEGER );               \
189     var_SetInteger( p_libvlc, "mosaic-" #name, p_sys->i_##name );           \
190     var_AddCallback( p_libvlc, "mosaic-" #name, MosaicCallback, p_sys );
191
192     GET_VAR( width, 0, INT_MAX );
193     GET_VAR( height, 0, INT_MAX );
194     GET_VAR( xoffset, 0, INT_MAX );
195     GET_VAR( yoffset, 0, INT_MAX );
196
197     p_sys->i_align = __MIN( 10, __MAX( 0,  var_CreateGetInteger( p_filter, "mosaic-align" ) ) );
198     if( p_sys->i_align == 3 || p_sys->i_align == 7 )
199         p_sys->i_align = 5;
200     var_Destroy( p_filter, "mosaic-align" );
201     var_Create( p_libvlc, "mosaic-align", VLC_VAR_INTEGER );
202     var_SetInteger( p_libvlc, "mosaic-align", p_sys->i_align );
203     var_AddCallback( p_libvlc, "mosaic-align", MosaicCallback, p_sys );
204
205     GET_VAR( vborder, 0, INT_MAX );
206     GET_VAR( hborder, 0, INT_MAX );
207     GET_VAR( rows, 1, INT_MAX );
208     GET_VAR( cols, 1, INT_MAX );
209     GET_VAR( alpha, 0, 255 );
210     GET_VAR( position, 0, 1 );
211     GET_VAR( delay, 100, INT_MAX );
212     p_sys->i_delay *= 1000;
213
214     p_sys->b_ar = var_CreateGetBool( p_filter, "mosaic-keep-aspect-ratio" );
215     var_Destroy( p_filter, "mosaic-keep-aspect-ratio" );
216     var_Create( p_libvlc, "mosaic-keep-aspect-ratio", VLC_VAR_INTEGER );
217     var_SetBool( p_libvlc, "mosaic-keep-aspect-ratio", p_sys->b_ar );
218     var_AddCallback( p_libvlc, "mosaic-keep-aspect-ratio", MosaicCallback,
219                      p_sys );
220
221     p_sys->b_keep = var_CreateGetBool( p_filter, "mosaic-keep-picture" );
222     if ( !p_sys->b_keep )
223     {
224         p_sys->p_image = image_HandlerCreate( p_filter );
225     }
226
227     p_sys->i_order_length = 0;
228     p_sys->ppsz_order = NULL;
229     psz_order = var_CreateGetString( p_filter, "mosaic-order" );
230
231     if( psz_order[0] != 0 )
232     {
233         char *psz_end = NULL;
234         i_index = 0;
235         do
236         { 
237             psz_end = strchr( psz_order, ',' );
238             i_index++;
239             p_sys->ppsz_order = realloc( p_sys->ppsz_order,
240                                          i_index * sizeof(char *) );
241             p_sys->ppsz_order[i_index - 1] = strndup( psz_order,
242                                            psz_end - psz_order );
243             psz_order = psz_end+1;
244         } while( NULL !=  psz_end );
245         p_sys->i_order_length = i_index;
246     }
247
248     vlc_mutex_unlock( &p_sys->lock );
249
250     return VLC_SUCCESS;
251 }
252
253 /*****************************************************************************
254  * DestroyFilter: destroy mosaic video filter
255  *****************************************************************************/
256 static void DestroyFilter( vlc_object_t *p_this )
257 {
258     filter_t *p_filter = (filter_t*)p_this;
259     filter_sys_t *p_sys = p_filter->p_sys;
260     libvlc_t *p_libvlc = p_filter->p_libvlc;
261     int i_index;
262
263     vlc_mutex_lock( &p_sys->lock );
264
265     if( !p_sys->b_keep )
266     {
267         image_HandlerDelete( p_sys->p_image );
268     }
269
270     if( p_sys->i_order_length )
271     {
272         for( i_index = 0; i_index < p_sys->i_order_length; i_index++ )
273         {
274             free( p_sys->ppsz_order[i_index] );
275         }
276         free( p_sys->ppsz_order );
277     }
278
279     var_Destroy( p_libvlc, "mosaic-alpha" );
280     var_Destroy( p_libvlc, "mosaic-height" );
281     var_Destroy( p_libvlc, "mosaic-align" );
282     var_Destroy( p_libvlc, "mosaic-width" );
283     var_Destroy( p_libvlc, "mosaic-xoffset" );
284     var_Destroy( p_libvlc, "mosaic-yoffset" );
285     var_Destroy( p_libvlc, "mosaic-vborder" );
286     var_Destroy( p_libvlc, "mosaic-hborder" );
287     var_Destroy( p_libvlc, "mosaic-position" );
288     var_Destroy( p_libvlc, "mosaic-rows" );
289     var_Destroy( p_libvlc, "mosaic-cols" );
290     var_Destroy( p_libvlc, "mosaic-keep-aspect-ratio" );
291
292     if( p_sys->p_pic ) p_sys->p_pic->pf_release( p_sys->p_pic );
293     vlc_mutex_unlock( &p_sys->lock );
294     vlc_mutex_destroy( &p_sys->lock );
295     free( p_sys );
296 }
297
298 /*****************************************************************************
299  * MosaicReleasePicture : Hack to avoid picture duplication
300  *****************************************************************************/
301 static void MosaicReleasePicture( picture_t *p_picture )
302 {
303     picture_t *p_original_pic = (picture_t *)p_picture->p_sys;
304
305     p_original_pic->pf_release( p_original_pic );
306 }
307
308 /*****************************************************************************
309  * Filter
310  *****************************************************************************/
311 static subpicture_t *Filter( filter_t *p_filter, mtime_t date )
312 {
313     filter_sys_t *p_sys = p_filter->p_sys;
314     bridge_t *p_bridge;
315
316     subpicture_t *p_spu;
317
318     int i_index, i_real_index, i_row, i_col;
319     int i_greatest_real_index_used = p_sys->i_order_length - 1;
320
321     subpicture_region_t *p_region;
322     subpicture_region_t *p_region_prev = NULL;
323
324     /* Allocate the subpicture internal data. */
325     p_spu = p_filter->pf_sub_buffer_new( p_filter );
326     if( !p_spu )
327     {
328         return NULL;
329     }
330
331     /* Initialize subpicture */
332     p_spu->i_channel = 0;
333     p_spu->i_start  = date;
334     p_spu->i_stop = 0;
335     p_spu->b_ephemer = VLC_TRUE;
336     p_spu->i_alpha = p_sys->i_alpha;
337     p_spu->i_flags = p_sys->i_align;
338     p_spu->b_absolute = VLC_FALSE;
339
340     vlc_mutex_lock( &p_sys->lock );
341     vlc_mutex_lock( p_sys->p_lock );
342
343     p_bridge = GetBridge( p_filter );
344     if ( p_bridge == NULL )
345     {
346         vlc_mutex_unlock( p_sys->p_lock );
347         vlc_mutex_unlock( &p_sys->lock );
348         return p_spu;
349     }
350
351     if ( p_sys->i_position == 0 ) /* use automatic positioning */
352     {
353         int i_numpics = p_sys->i_order_length; /* keep slots and all */
354         for ( i_index = 0; i_index < p_bridge->i_es_num; i_index++ )
355         {
356             bridged_es_t *p_es = p_bridge->pp_es[i_index];
357             if ( !p_es->b_empty )
358             {
359                 i_numpics ++;
360                 if( p_sys->i_order_length && p_es->psz_id != 0 )
361                 {
362                     /* We also want to leave slots for images given in
363                      * mosaic-order that are not available in p_vout_picture */
364                     int i;
365                     for( i = 0; i < p_sys->i_order_length ; i++ )
366                     {
367                         if( !strcmp( p_sys->ppsz_order[i], p_es->psz_id ) )
368                         {
369                             i_numpics--;
370                             break;
371                         }
372                     }
373
374                 }
375             }
376         }
377         p_sys->i_rows = ((int)ceil(sqrt( (float)i_numpics )));
378         p_sys->i_cols = ( i_numpics % p_sys->i_rows == 0 ?
379                             i_numpics / p_sys->i_rows :
380                             i_numpics / p_sys->i_rows + 1 );
381     }
382
383     i_real_index = 0;
384
385     for ( i_index = 0; i_index < p_bridge->i_es_num; i_index++ )
386     {
387         bridged_es_t *p_es = p_bridge->pp_es[i_index];
388         video_format_t fmt_in = {0}, fmt_out = {0};
389         picture_t *p_converted;
390
391         if ( p_es->b_empty || p_es->p_picture == NULL )
392             continue;
393
394         if ( p_es->p_picture->date + p_sys->i_delay < date )
395         {
396             if ( p_es->p_picture->p_next != NULL )
397             {
398                 picture_t *p_next = p_es->p_picture->p_next;
399                 p_es->p_picture->pf_release( p_es->p_picture );
400                 p_es->p_picture = p_next;
401             }
402             else if ( p_es->p_picture->date + p_sys->i_delay + BLANK_DELAY <
403                         date )
404             {
405                 /* Display blank */
406                 p_es->p_picture->pf_release( p_es->p_picture );
407                 p_es->p_picture = NULL;
408                 p_es->pp_last = &p_es->p_picture;
409                 continue;
410             }
411             else
412                 msg_Dbg( p_filter, "too late picture %lld for %s",
413                          date - p_es->p_picture->date - p_sys->i_delay,
414                          p_es->psz_id );
415         }
416
417         if ( p_sys->i_order_length == 0 )
418         {
419             i_real_index++;
420         }
421         else
422         {
423             int i;
424             for ( i = 0; i <= p_sys->i_order_length; i++ )
425             {
426                 if ( i == p_sys->i_order_length ) break;
427                 if ( strcmp( p_es->psz_id, p_sys->ppsz_order[i] ) == 0 )
428                 {
429                     i_real_index = i;
430                     break;
431                 }
432             }
433             if ( i == p_sys->i_order_length )
434                 i_real_index = ++i_greatest_real_index_used;
435         }
436         i_row = ( i_real_index / p_sys->i_cols ) % p_sys->i_rows;
437         i_col = i_real_index % p_sys->i_cols ;
438
439         if ( !p_sys->b_keep )
440         {
441             /* Convert the images */
442             fmt_in.i_chroma = p_es->p_picture->format.i_chroma;
443             fmt_in.i_height = p_es->p_picture->format.i_height;
444             fmt_in.i_width = p_es->p_picture->format.i_width;
445
446             fmt_out.i_chroma = VLC_FOURCC('Y','U','V','A');
447             fmt_out.i_width = fmt_in.i_width *
448                 ( ( p_sys->i_width - ( p_sys->i_cols - 1 ) * p_sys->i_vborder )
449                   / p_sys->i_cols ) / fmt_in.i_width;
450             fmt_out.i_height = fmt_in.i_height *
451                 ( ( p_sys->i_height - ( p_sys->i_rows - 1 ) * p_sys->i_hborder )
452                   / p_sys->i_rows ) / fmt_in.i_height;
453             if( p_sys->b_ar ) /* keep aspect ratio */
454             {
455                 if( (float)fmt_out.i_width / (float)fmt_out.i_height
456                       > (float)fmt_in.i_width / (float)fmt_in.i_height )
457                 {
458                     fmt_out.i_width = ( fmt_out.i_height * fmt_in.i_width )
459                                          / fmt_in.i_height;
460                 }
461                 else
462                 {
463                     fmt_out.i_height = ( fmt_out.i_width * fmt_in.i_height )
464                                         / fmt_in.i_width;
465                 }
466              }
467
468             fmt_out.i_visible_width = fmt_out.i_width;
469             fmt_out.i_visible_height = fmt_out.i_height;
470
471             p_converted = image_Convert( p_sys->p_image, p_es->p_picture,
472                                          &fmt_in, &fmt_out );
473             if( !p_converted )
474             {
475                 msg_Warn( p_filter,
476                            "image resizing and chroma conversion failed" );
477                 continue;
478             }
479         }
480         else
481         {
482             p_converted = p_es->p_picture;
483             p_converted->i_refcount++;
484             fmt_in.i_width = fmt_out.i_width = p_converted->format.i_width;
485             fmt_in.i_height = fmt_out.i_height = p_converted->format.i_height;
486             fmt_in.i_chroma = fmt_out.i_chroma = p_converted->format.i_chroma;
487             fmt_out.i_visible_width = fmt_out.i_width;
488             fmt_out.i_visible_height = fmt_out.i_height;
489         }
490
491         p_region = p_spu->pf_make_region( VLC_OBJECT(p_filter), &fmt_out,
492                                           p_converted );
493         if( !p_region )
494         {
495             msg_Err( p_filter, "cannot allocate SPU region" );
496             p_filter->pf_sub_buffer_del( p_filter, p_spu );
497             vlc_mutex_unlock( &p_sys->lock );
498             vlc_mutex_unlock( p_sys->p_lock );
499             return p_spu;
500         }
501
502         /* HACK ALERT : let's fix the pointers to avoid picture duplication.
503          * This is necessary because p_region->picture is not a pointer
504          * as it ought to be. */
505         if( !p_sys->b_keep )
506         {
507             free( p_converted );
508         }
509         else
510         {
511             /* Keep a pointer to the original picture (and its refcount...). */
512             p_region->picture.p_sys = (picture_sys_t *)p_converted;
513             p_region->picture.pf_release = MosaicReleasePicture;
514         }
515
516         if( p_sys->b_ar || p_sys->b_keep ) /* keep aspect ratio */
517         {
518             /* center the video in the dedicated rectangle */
519             p_region->i_x = p_sys->i_xoffset
520                         + i_col * ( p_sys->i_width / p_sys->i_cols )
521                         + ( i_col * p_sys->i_vborder ) / p_sys->i_cols
522                         + ( ( ( p_sys->i_width
523                                  - ( p_sys->i_cols - 1 ) * p_sys->i_vborder )
524                             / p_sys->i_cols ) - fmt_out.i_width ) / 2;
525             p_region->i_y = p_sys->i_yoffset
526                         + i_row * ( p_sys->i_height / p_sys->i_rows )
527                         + ( i_row * p_sys->i_hborder ) / p_sys->i_rows
528                         + ( ( ( p_sys->i_height
529                                  - ( p_sys->i_rows - 1 ) * p_sys->i_hborder )
530                             / p_sys->i_rows ) - fmt_out.i_height ) / 2;
531         }
532         else
533         {
534             /* we don't have to center the video since it takes the
535             whole rectangle area */
536             p_region->i_x = p_sys->i_xoffset
537                             + i_col * ( p_sys->i_width / p_sys->i_cols )
538                             + ( i_col * p_sys->i_vborder ) / p_sys->i_cols;
539             p_region->i_y = p_sys->i_yoffset
540                         + i_row * ( p_sys->i_height / p_sys->i_rows )
541                         + ( i_row * p_sys->i_hborder ) / p_sys->i_rows;
542         }
543
544         if( p_region_prev == NULL )
545         {
546             p_spu->p_region = p_region;
547         }
548         else
549         {
550             p_region_prev->p_next = p_region;
551         }
552
553         p_region_prev = p_region;
554     }
555
556     vlc_mutex_unlock( p_sys->p_lock );
557     vlc_mutex_unlock( &p_sys->lock );
558
559     return p_spu;
560 }
561
562 /*****************************************************************************
563 * Callback to update params on the fly
564 *****************************************************************************/
565 static int MosaicCallback( vlc_object_t *p_this, char const *psz_var,
566                             vlc_value_t oldval, vlc_value_t newval,
567                             void *p_data )
568 {
569     filter_sys_t *p_sys = (filter_sys_t *) p_data;
570     if( !strcmp( psz_var, "mosaic-alpha" ) )
571     {
572         vlc_mutex_lock( &p_sys->lock );
573         msg_Dbg( p_this, "Changing alpha from %d/255 to %d/255",
574                          p_sys->i_alpha, newval.i_int);
575         p_sys->i_alpha = __MIN( __MAX( newval.i_int, 0 ), 255 );
576         vlc_mutex_unlock( &p_sys->lock );
577     }
578     else if( !strcmp( psz_var, "mosaic-height" ) )
579     {
580         vlc_mutex_lock( &p_sys->lock );
581         msg_Dbg( p_this, "Changing height from %dpx to %dpx",
582                           p_sys->i_height, newval.i_int );
583         p_sys->i_height = __MAX( newval.i_int, 0 );
584         vlc_mutex_unlock( &p_sys->lock );
585     }
586     else if( !strcmp( psz_var, "mosaic-width" ) )
587     {
588         vlc_mutex_lock( &p_sys->lock );
589         msg_Dbg( p_this, "Changing width from %dpx to %dpx",
590                          p_sys->i_width, newval.i_int );
591         p_sys->i_width = __MAX( newval.i_int, 0 );
592         vlc_mutex_unlock( &p_sys->lock );
593     }
594     else if( !strcmp( psz_var, "mosaic-xoffset" ) )
595     {
596         vlc_mutex_lock( &p_sys->lock );
597         msg_Dbg( p_this, "Changing x offset from %dpx to %dpx",
598                          p_sys->i_xoffset, newval.i_int );
599         p_sys->i_xoffset = __MAX( newval.i_int, 0 );
600         vlc_mutex_unlock( &p_sys->lock );
601     }
602     else if( !strcmp( psz_var, "mosaic-yoffset" ) )
603     {
604         vlc_mutex_lock( &p_sys->lock );
605         msg_Dbg( p_this, "Changing y offset from %dpx to %dpx",
606                          p_sys->i_yoffset, newval.i_int );
607         p_sys->i_yoffset = __MAX( newval.i_int, 0 );
608         vlc_mutex_unlock( &p_sys->lock );
609     }
610     else if( !strcmp( psz_var, "mosaic-align" ) )
611     {
612         int i_old = 0, i_new = 0;
613         vlc_mutex_lock( &p_sys->lock );
614         newval.i_int = __MIN( __MAX( newval.i_int, 0 ), 10 );
615         if( newval.i_int == 3 || newval.i_int == 7 )
616             newval.i_int = 5;
617         while( pi_align_values[i_old] != p_sys->i_align ) i_old++;
618         while( pi_align_values[i_new] != newval.i_int ) i_new++;
619         msg_Dbg( p_this, "Changing alignment from %d (%s) to %d (%s)",
620                      p_sys->i_align, ppsz_align_descriptions[i_old],
621                      newval.i_int, ppsz_align_descriptions[i_new] );
622         p_sys->i_align = newval.i_int;
623         vlc_mutex_unlock( &p_sys->lock );
624     }
625     else if( !strcmp( psz_var, "mosaic-vborder" ) )
626     {
627         vlc_mutex_lock( &p_sys->lock );
628         msg_Dbg( p_this, "Changing vertical border from %dpx to %dpx",
629                          p_sys->i_vborder, newval.i_int );
630         p_sys->i_vborder = __MAX( newval.i_int, 0 );
631         vlc_mutex_unlock( &p_sys->lock );
632     }
633     else if( !strcmp( psz_var, "mosaic-hborder" ) )
634     {
635         vlc_mutex_lock( &p_sys->lock );
636         msg_Dbg( p_this, "Changing horizontal border from %dpx to %dpx",
637                          p_sys->i_vborder, newval.i_int );
638         p_sys->i_hborder = __MAX( newval.i_int, 0 );
639         vlc_mutex_unlock( &p_sys->lock );
640     }
641     else if( !strcmp( psz_var, "mosaic-position" ) )
642     {
643         if( newval.i_int > 1 || newval.i_int < 0 )
644         {
645             msg_Err( p_this, "Position is either 0 (auto) or 1 (fixed)" );
646         }
647         else
648         {
649             vlc_mutex_lock( &p_sys->lock );
650             msg_Dbg( p_this, "Changing position method from %d (%s) to %d (%s)",
651                              p_sys->i_position, ppsz_pos_descriptions[p_sys->i_position],
652                              newval.i_int, ppsz_pos_descriptions[newval.i_int]);
653             p_sys->i_position = newval.i_int;
654             vlc_mutex_unlock( &p_sys->lock );
655         }
656     }
657     else if( !strcmp( psz_var, "mosaic-rows" ) )
658     {
659         vlc_mutex_lock( &p_sys->lock );
660         msg_Dbg( p_this, "Changing number of rows from %d to %d",
661                          p_sys->i_rows, newval.i_int );
662         p_sys->i_rows = __MAX( newval.i_int, 1 );
663         vlc_mutex_unlock( &p_sys->lock );
664     }
665     else if( !strcmp( psz_var, "mosaic-cols" ) )
666     {
667         vlc_mutex_lock( &p_sys->lock );
668         msg_Dbg( p_this, "Changing number of columns from %d to %d",
669                          p_sys->i_cols, newval.i_int );
670         p_sys->i_cols = __MAX( newval.i_int, 1 );
671         vlc_mutex_unlock( &p_sys->lock );
672     }
673     else if( !strcmp( psz_var, "mosaic-keep-aspect-ratio" ) )
674     {
675         vlc_mutex_lock( &p_sys->lock );
676         if( newval.i_int )
677         {
678             msg_Dbg( p_this, "Keep aspect ratio" );
679             p_sys->b_ar = 1;
680         }
681         else
682         {
683             msg_Dbg( p_this, "Don't keep aspect ratio" );
684             p_sys->b_ar = 0;
685         }
686         vlc_mutex_unlock( &p_sys->lock );
687     }
688     return VLC_SUCCESS;
689 }