734e9f6cdc11a6de106deb7a3ad976dbf2969c28
[vlc.git] / modules / stream_out / mosaic_bridge.c
1 /*****************************************************************************
2  * mosaic_bridge.c:
3  *****************************************************************************
4  * Copyright (C) 2004-2007 VLC authors and VideoLAN
5  * $Id$
6  *
7  * Authors: Antoine Cellerier <dionoea@videolan.org>
8  *          Christophe Massiot <massiot@via.ecp.fr>
9  *
10  * This program is free software; you can redistribute it and/or modify it
11  * under the terms of the GNU Lesser General Public License as published by
12  * the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
19  *
20  * You should have received a copy of the GNU Lesser General Public License
21  * along with this program; if not, write to the Free Software Foundation,
22  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
23  *****************************************************************************/
24
25 /*****************************************************************************
26  * Preamble
27  *****************************************************************************/
28
29 #ifdef HAVE_CONFIG_H
30 # include "config.h"
31 #endif
32
33 #include <vlc_common.h>
34 #include <vlc_plugin.h>
35 #include <vlc_sout.h>
36 #include <vlc_block.h>
37 #include <vlc_codec.h>
38 #include <vlc_meta.h>
39
40 #include <vlc_image.h>
41 #include <vlc_filter.h>
42 #include <vlc_modules.h>
43
44 #include "../video_filter/mosaic.h"
45
46 /*****************************************************************************
47  * Local structures
48  *****************************************************************************/
49 struct sout_stream_sys_t
50 {
51     bridged_es_t *p_es;
52
53     decoder_t       *p_decoder;
54     image_handler_t *p_image; /* filter for resizing */
55     int i_height, i_width;
56     unsigned int i_sar_num, i_sar_den;
57     char *psz_id;
58     bool b_inited;
59
60     int i_chroma; /* force image format chroma */
61
62     filter_chain_t *p_vf2;
63 };
64
65 struct decoder_owner_sys_t
66 {
67     /* Current format in use by the output */
68     video_format_t video;
69 };
70
71 /*****************************************************************************
72  * Local prototypes
73  *****************************************************************************/
74 static int  Open    ( vlc_object_t * );
75 static void Close   ( vlc_object_t * );
76 static sout_stream_id_sys_t *Add ( sout_stream_t *, es_format_t * );
77 static int               Del ( sout_stream_t *, sout_stream_id_sys_t * );
78 static int               Send( sout_stream_t *, sout_stream_id_sys_t *, block_t * );
79
80 inline static void video_del_buffer_decoder( decoder_t *, picture_t * );
81 inline static void video_del_buffer_filter( filter_t *, picture_t * );
82
83 inline static picture_t *video_new_buffer_decoder( decoder_t * );
84 inline static picture_t *video_new_buffer_filter( filter_t * );
85 static picture_t *video_new_buffer( vlc_object_t *, decoder_owner_sys_t *,
86                                     es_format_t * );
87
88 static void video_link_picture_decoder( decoder_t *, picture_t * );
89 static void video_unlink_picture_decoder( decoder_t *, picture_t * );
90
91 static int HeightCallback( vlc_object_t *, char const *,
92                            vlc_value_t, vlc_value_t, void * );
93 static int WidthCallback( vlc_object_t *, char const *,
94                           vlc_value_t, vlc_value_t, void * );
95 static int alphaCallback( vlc_object_t *, char const *,
96                           vlc_value_t, vlc_value_t, void * );
97 static int xCallback( vlc_object_t *, char const *,
98                       vlc_value_t, vlc_value_t, void * );
99 static int yCallback( vlc_object_t *, char const *,
100                       vlc_value_t, vlc_value_t, void * );
101
102 /*****************************************************************************
103  * Module descriptor
104  *****************************************************************************/
105 #define ID_TEXT N_("ID")
106 #define ID_LONGTEXT N_( \
107     "Specify an identifier string for this subpicture" )
108
109 #define WIDTH_TEXT N_("Video width")
110 #define WIDTH_LONGTEXT N_( \
111     "Output video width." )
112 #define HEIGHT_TEXT N_("Video height")
113 #define HEIGHT_LONGTEXT N_( \
114     "Output video height." )
115 #define RATIO_TEXT N_("Sample aspect ratio")
116 #define RATIO_LONGTEXT N_( \
117     "Sample aspect ratio of the destination (1:1, 3:4, 2:3)." )
118
119 #define VFILTER_TEXT N_("Video filter")
120 #define VFILTER_LONGTEXT N_( \
121     "Video filters will be applied to the video stream." )
122
123 #define CHROMA_TEXT N_("Image chroma")
124 #define CHROMA_LONGTEXT N_( \
125     "Force the use of a specific chroma. Use YUVA if you're planning " \
126     "to use the Alphamask or Bluescreen video filter." )
127
128 #define ALPHA_TEXT N_("Transparency")
129 #define ALPHA_LONGTEXT N_( \
130     "Transparency of the mosaic picture." )
131
132 #define X_TEXT N_("X offset")
133 #define X_LONGTEXT N_( \
134     "X coordinate of the upper left corner in the mosaic if non negative." )
135
136 #define Y_TEXT N_("Y offset")
137 #define Y_LONGTEXT N_( \
138     "Y coordinate of the upper left corner in the mosaic if non negative." )
139
140 #define CFG_PREFIX "sout-mosaic-bridge-"
141
142 vlc_module_begin ()
143     set_shortname( N_( "Mosaic bridge" ) )
144     set_description(N_("Mosaic bridge stream output") )
145     set_capability( "sout stream", 0 )
146     add_shortcut( "mosaic-bridge" )
147
148     add_string( CFG_PREFIX "id", "Id", ID_TEXT, ID_LONGTEXT,
149                 false )
150     add_integer( CFG_PREFIX "width", 0, WIDTH_TEXT,
151                  WIDTH_LONGTEXT, true )
152     add_integer( CFG_PREFIX "height", 0, HEIGHT_TEXT,
153                  HEIGHT_LONGTEXT, true )
154     add_string( CFG_PREFIX "sar", "1:1", RATIO_TEXT,
155                 RATIO_LONGTEXT, false )
156     add_string( CFG_PREFIX "chroma", NULL, CHROMA_TEXT, CHROMA_LONGTEXT,
157                 false )
158
159     add_module_list( CFG_PREFIX "vfilter", "video filter2",
160                      NULL, VFILTER_TEXT, VFILTER_LONGTEXT, false )
161
162     add_integer_with_range( CFG_PREFIX "alpha", 255, 0, 255,
163                             ALPHA_TEXT, ALPHA_LONGTEXT, false )
164     add_integer( CFG_PREFIX "x", -1, X_TEXT, X_LONGTEXT, false )
165     add_integer( CFG_PREFIX "y", -1, Y_TEXT, Y_LONGTEXT, false )
166
167     set_callbacks( Open, Close )
168 vlc_module_end ()
169
170 static const char *const ppsz_sout_options[] = {
171     "id", "width", "height", "sar", "vfilter", "chroma", "alpha", "x", "y", NULL
172 };
173
174 /*****************************************************************************
175  * Open
176  *****************************************************************************/
177 static int Open( vlc_object_t *p_this )
178 {
179     sout_stream_t        *p_stream = (sout_stream_t *)p_this;
180     sout_stream_sys_t    *p_sys;
181     vlc_value_t           val;
182
183     config_ChainParse( p_stream, CFG_PREFIX, ppsz_sout_options,
184                        p_stream->p_cfg );
185
186     p_sys = malloc( sizeof( sout_stream_sys_t ) );
187     if( !p_sys )
188         return VLC_ENOMEM;
189
190     p_stream->p_sys = p_sys;
191     p_sys->b_inited = false;
192
193     p_sys->psz_id = var_CreateGetString( p_stream, CFG_PREFIX "id" );
194
195     p_sys->i_height =
196         var_CreateGetIntegerCommand( p_stream, CFG_PREFIX "height" );
197     var_AddCallback( p_stream, CFG_PREFIX "height", HeightCallback, p_stream );
198
199     p_sys->i_width =
200         var_CreateGetIntegerCommand( p_stream, CFG_PREFIX "width" );
201     var_AddCallback( p_stream, CFG_PREFIX "width", WidthCallback, p_stream );
202
203     var_Get( p_stream, CFG_PREFIX "sar", &val );
204     if( val.psz_string )
205     {
206         char *psz_parser = strchr( val.psz_string, ':' );
207
208         if( psz_parser )
209         {
210             *psz_parser++ = '\0';
211             p_sys->i_sar_num = atoi( val.psz_string );
212             p_sys->i_sar_den = atoi( psz_parser );
213             vlc_ureduce( &p_sys->i_sar_num, &p_sys->i_sar_den,
214                          p_sys->i_sar_num, p_sys->i_sar_den, 0 );
215         }
216         else
217         {
218             msg_Warn( p_stream, "bad aspect ratio %s", val.psz_string );
219             p_sys->i_sar_num = p_sys->i_sar_den = 1;
220         }
221
222         free( val.psz_string );
223     }
224     else
225     {
226         p_sys->i_sar_num = p_sys->i_sar_den = 1;
227     }
228
229     p_sys->i_chroma = 0;
230     val.psz_string = var_GetNonEmptyString( p_stream, CFG_PREFIX "chroma" );
231     if( val.psz_string && strlen( val.psz_string ) >= 4 )
232     {
233         memcpy( &p_sys->i_chroma, val.psz_string, 4 );
234         msg_Dbg( p_stream, "Forcing image chroma to 0x%.8x (%4.4s)", p_sys->i_chroma, (char*)&p_sys->i_chroma );
235     }
236     free( val.psz_string );
237
238 #define INT_COMMAND( a ) do { \
239     var_Create( p_stream, CFG_PREFIX #a, \
240                 VLC_VAR_INTEGER | VLC_VAR_DOINHERIT | VLC_VAR_ISCOMMAND ); \
241     var_AddCallback( p_stream, CFG_PREFIX #a, a ## Callback, \
242                      p_stream ); } while(0)
243     INT_COMMAND( alpha );
244     INT_COMMAND( x );
245     INT_COMMAND( y );
246
247 #undef INT_COMMAND
248
249     p_stream->pf_add    = Add;
250     p_stream->pf_del    = Del;
251     p_stream->pf_send   = Send;
252     p_stream->pace_nocontrol = true;
253
254     return VLC_SUCCESS;
255 }
256
257 /*****************************************************************************
258  * Close
259  *****************************************************************************/
260 static void Close( vlc_object_t * p_this )
261 {
262     sout_stream_t     *p_stream = (sout_stream_t*)p_this;
263     sout_stream_sys_t *p_sys = p_stream->p_sys;
264
265     /* Delete the callbacks */
266     var_DelCallback( p_stream, CFG_PREFIX "height", HeightCallback, p_stream );
267     var_DelCallback( p_stream, CFG_PREFIX "width", WidthCallback, p_stream );
268     var_DelCallback( p_stream, CFG_PREFIX "alpha", alphaCallback, p_stream );
269     var_DelCallback( p_stream, CFG_PREFIX "x", xCallback, p_stream );
270     var_DelCallback( p_stream, CFG_PREFIX "y", yCallback, p_stream );
271
272     free( p_sys->psz_id );
273
274     free( p_sys );
275 }
276
277 static int video_filter_buffer_allocation_init( filter_t *p_filter, void *p_data )
278 {
279     p_filter->owner.sys = p_data;
280     p_filter->owner.video.buffer_new = video_new_buffer_filter;
281     p_filter->owner.video.buffer_del = video_del_buffer_filter;
282     return VLC_SUCCESS;
283 }
284
285 static sout_stream_id_sys_t * Add( sout_stream_t *p_stream, es_format_t *p_fmt )
286 {
287     sout_stream_sys_t *p_sys = p_stream->p_sys;
288     bridge_t *p_bridge;
289     bridged_es_t *p_es;
290     char *psz_chain;
291     int i;
292
293     if( p_sys->b_inited || p_fmt->i_cat != VIDEO_ES )
294         return NULL;
295
296     /* Create decoder object */
297     p_sys->p_decoder = vlc_object_create( p_stream, sizeof( decoder_t ) );
298     if( !p_sys->p_decoder )
299         return NULL;
300     p_sys->p_decoder->p_module = NULL;
301     p_sys->p_decoder->fmt_in = *p_fmt;
302     p_sys->p_decoder->b_pace_control = false;
303     p_sys->p_decoder->fmt_out = p_sys->p_decoder->fmt_in;
304     p_sys->p_decoder->fmt_out.i_extra = 0;
305     p_sys->p_decoder->fmt_out.p_extra = 0;
306     p_sys->p_decoder->pf_decode_video = 0;
307     p_sys->p_decoder->pf_vout_buffer_new = video_new_buffer_decoder;
308     p_sys->p_decoder->pf_vout_buffer_del = video_del_buffer_decoder;
309     p_sys->p_decoder->pf_picture_link    = video_link_picture_decoder;
310     p_sys->p_decoder->pf_picture_unlink  = video_unlink_picture_decoder;
311     p_sys->p_decoder->p_owner = malloc( sizeof(decoder_owner_sys_t) );
312     if( !p_sys->p_decoder->p_owner )
313     {
314         vlc_object_release( p_sys->p_decoder );
315         return NULL;
316     }
317
318     p_sys->p_decoder->p_owner->video = p_fmt->video;
319     //p_sys->p_decoder->p_cfg = p_sys->p_video_cfg;
320
321     p_sys->p_decoder->p_module =
322         module_need( p_sys->p_decoder, "decoder", "$codec", false );
323
324     if( !p_sys->p_decoder->p_module || !p_sys->p_decoder->pf_decode_video )
325     {
326         if( p_sys->p_decoder->p_module )
327         {
328             msg_Err( p_stream, "instanciated a non video decoder" );
329             module_unneed( p_sys->p_decoder, p_sys->p_decoder->p_module );
330         }
331         else
332         {
333             msg_Err( p_stream, "cannot find decoder" );
334         }
335         free( p_sys->p_decoder->p_owner );
336         vlc_object_release( p_sys->p_decoder );
337         return NULL;
338     }
339
340     p_sys->b_inited = true;
341     vlc_global_lock( VLC_MOSAIC_MUTEX );
342
343     p_bridge = GetBridge( p_stream );
344     if ( p_bridge == NULL )
345     {
346         vlc_object_t *p_libvlc = VLC_OBJECT( p_stream->p_libvlc );
347         vlc_value_t val;
348
349         p_bridge = xmalloc( sizeof( bridge_t ) );
350
351         var_Create( p_libvlc, "mosaic-struct", VLC_VAR_ADDRESS );
352         val.p_address = p_bridge;
353         var_Set( p_libvlc, "mosaic-struct", val );
354
355         p_bridge->i_es_num = 0;
356         p_bridge->pp_es = NULL;
357     }
358
359     for ( i = 0; i < p_bridge->i_es_num; i++ )
360     {
361         if ( p_bridge->pp_es[i]->b_empty )
362             break;
363     }
364
365     if ( i == p_bridge->i_es_num )
366     {
367         p_bridge->pp_es = xrealloc( p_bridge->pp_es,
368                           (p_bridge->i_es_num + 1) * sizeof(bridged_es_t *) );
369         p_bridge->i_es_num++;
370         p_bridge->pp_es[i] = xmalloc( sizeof(bridged_es_t) );
371     }
372
373     p_sys->p_es = p_es = p_bridge->pp_es[i];
374
375     p_es->i_alpha = var_GetInteger( p_stream, CFG_PREFIX "alpha" );
376     p_es->i_x = var_GetInteger( p_stream, CFG_PREFIX "x" );
377     p_es->i_y = var_GetInteger( p_stream, CFG_PREFIX "y" );
378
379     //p_es->fmt = *p_fmt;
380     p_es->psz_id = p_sys->psz_id;
381     p_es->p_picture = NULL;
382     p_es->pp_last = &p_es->p_picture;
383     p_es->b_empty = false;
384
385     vlc_global_unlock( VLC_MOSAIC_MUTEX );
386
387     if ( p_sys->i_height || p_sys->i_width )
388     {
389         p_sys->p_image = image_HandlerCreate( p_stream );
390     }
391     else
392     {
393         p_sys->p_image = NULL;
394     }
395
396     msg_Dbg( p_stream, "mosaic bridge id=%s pos=%d", p_es->psz_id, i );
397
398     /* Create user specified video filters */
399     psz_chain = var_GetNonEmptyString( p_stream, CFG_PREFIX "vfilter" );
400     msg_Dbg( p_stream, "psz_chain: %s", psz_chain );
401     if( psz_chain )
402     {
403         p_sys->p_vf2 = filter_chain_New( p_stream, "video filter2", false,
404                                          video_filter_buffer_allocation_init,
405                                          NULL, p_sys->p_decoder->p_owner );
406         es_format_t fmt;
407         es_format_Copy( &fmt, &p_sys->p_decoder->fmt_out );
408         if( p_sys->i_chroma )
409             fmt.video.i_chroma = p_sys->i_chroma;
410         filter_chain_Reset( p_sys->p_vf2, &fmt, &fmt );
411         filter_chain_AppendFromString( p_sys->p_vf2, psz_chain );
412         free( psz_chain );
413     }
414     else
415     {
416         p_sys->p_vf2 = NULL;
417     }
418
419     return (sout_stream_id_sys_t *)p_sys;
420 }
421
422 static int Del( sout_stream_t *p_stream, sout_stream_id_sys_t *id )
423 {
424     VLC_UNUSED(id);
425     sout_stream_sys_t *p_sys = p_stream->p_sys;
426     bridge_t *p_bridge;
427     bridged_es_t *p_es;
428     bool b_last_es = true;
429     int i;
430
431     if( !p_sys->b_inited )
432         return VLC_SUCCESS;
433
434     if( p_sys->p_decoder != NULL )
435     {
436         decoder_owner_sys_t *p_owner = p_sys->p_decoder->p_owner;
437
438         if( p_sys->p_decoder->p_module )
439             module_unneed( p_sys->p_decoder, p_sys->p_decoder->p_module );
440         if( p_sys->p_decoder->p_description )
441             vlc_meta_Delete( p_sys->p_decoder->p_description );
442
443         vlc_object_release( p_sys->p_decoder );
444
445         free( p_owner );
446     }
447
448     /* Destroy user specified video filters */
449     if( p_sys->p_vf2 )
450         filter_chain_Delete( p_sys->p_vf2 );
451
452     vlc_global_lock( VLC_MOSAIC_MUTEX );
453
454     p_bridge = GetBridge( p_stream );
455     p_es = p_sys->p_es;
456
457     p_es->b_empty = true;
458     while ( p_es->p_picture )
459     {
460         picture_t *p_next = p_es->p_picture->p_next;
461         picture_Release( p_es->p_picture );
462         p_es->p_picture = p_next;
463     }
464
465     for ( i = 0; i < p_bridge->i_es_num; i++ )
466     {
467         if ( !p_bridge->pp_es[i]->b_empty )
468         {
469             b_last_es = false;
470             break;
471         }
472     }
473
474     if ( b_last_es )
475     {
476         vlc_object_t *p_libvlc = VLC_OBJECT( p_stream->p_libvlc );
477         for ( i = 0; i < p_bridge->i_es_num; i++ )
478             free( p_bridge->pp_es[i] );
479         free( p_bridge->pp_es );
480         free( p_bridge );
481         var_Destroy( p_libvlc, "mosaic-struct" );
482     }
483
484     vlc_global_unlock( VLC_MOSAIC_MUTEX );
485
486     if ( p_sys->p_image )
487     {
488         image_HandlerDelete( p_sys->p_image );
489     }
490
491     p_sys->b_inited = false;
492
493     return VLC_SUCCESS;
494 }
495
496 /*****************************************************************************
497  * PushPicture : push a picture in the mosaic-struct structure
498  *****************************************************************************/
499 static void PushPicture( sout_stream_t *p_stream, picture_t *p_picture )
500 {
501     sout_stream_sys_t *p_sys = p_stream->p_sys;
502     bridged_es_t *p_es = p_sys->p_es;
503
504     vlc_global_lock( VLC_MOSAIC_MUTEX );
505
506     *p_es->pp_last = p_picture;
507     p_picture->p_next = NULL;
508     p_es->pp_last = &p_picture->p_next;
509
510     vlc_global_unlock( VLC_MOSAIC_MUTEX );
511 }
512
513 static int Send( sout_stream_t *p_stream, sout_stream_id_sys_t *id,
514                  block_t *p_buffer )
515 {
516     sout_stream_sys_t *p_sys = p_stream->p_sys;
517     picture_t *p_pic;
518
519     if ( (sout_stream_sys_t *)id != p_sys )
520     {
521         block_ChainRelease( p_buffer );
522         return VLC_SUCCESS;
523     }
524
525     while ( (p_pic = p_sys->p_decoder->pf_decode_video( p_sys->p_decoder,
526                                                         &p_buffer )) )
527     {
528         picture_t *p_new_pic;
529
530         if( p_sys->i_height || p_sys->i_width )
531         {
532             video_format_t fmt_out, fmt_in;
533
534             memset( &fmt_in, 0, sizeof(video_format_t) );
535             memset( &fmt_out, 0, sizeof(video_format_t) );
536             fmt_in = p_sys->p_decoder->fmt_out.video;
537
538
539             if( p_sys->i_chroma )
540                 fmt_out.i_chroma = p_sys->i_chroma;
541             else
542                 fmt_out.i_chroma = VLC_CODEC_I420;
543
544             const unsigned i_fmt_in_aspect =
545                 (int64_t)VOUT_ASPECT_FACTOR *
546                 fmt_in.i_sar_num * fmt_in.i_width /
547                 (fmt_in.i_sar_den * fmt_in.i_height);
548             if ( !p_sys->i_height )
549             {
550                 fmt_out.i_width = p_sys->i_width;
551                 fmt_out.i_height = (p_sys->i_width * VOUT_ASPECT_FACTOR
552                     * p_sys->i_sar_num / p_sys->i_sar_den / i_fmt_in_aspect)
553                       & ~0x1;
554             }
555             else if ( !p_sys->i_width )
556             {
557                 fmt_out.i_height = p_sys->i_height;
558                 fmt_out.i_width = (p_sys->i_height * i_fmt_in_aspect
559                     * p_sys->i_sar_den / p_sys->i_sar_num / VOUT_ASPECT_FACTOR)
560                       & ~0x1;
561             }
562             else
563             {
564                 fmt_out.i_width = p_sys->i_width;
565                 fmt_out.i_height = p_sys->i_height;
566             }
567             fmt_out.i_visible_width = fmt_out.i_width;
568             fmt_out.i_visible_height = fmt_out.i_height;
569
570             p_new_pic = image_Convert( p_sys->p_image,
571                                        p_pic, &fmt_in, &fmt_out );
572             if( p_new_pic == NULL )
573             {
574                 msg_Err( p_stream, "image conversion failed" );
575                 picture_Release( p_pic );
576                 continue;
577             }
578         }
579         else
580         {
581             /* TODO: chroma conversion if needed */
582
583             p_new_pic = picture_New( p_pic->format.i_chroma,
584                                      p_pic->format.i_width, p_pic->format.i_height,
585                                      p_sys->p_decoder->fmt_out.video.i_sar_num,
586                                      p_sys->p_decoder->fmt_out.video.i_sar_den );
587             if( !p_new_pic )
588             {
589                 picture_Release( p_pic );
590                 msg_Err( p_stream, "image allocation failed" );
591                 continue;
592             }
593
594             picture_Copy( p_new_pic, p_pic );
595         }
596         picture_Release( p_pic );
597
598         if( p_sys->p_vf2 )
599             p_new_pic = filter_chain_VideoFilter( p_sys->p_vf2, p_new_pic );
600
601         PushPicture( p_stream, p_new_pic );
602     }
603
604     return VLC_SUCCESS;
605 }
606
607 inline static picture_t *video_new_buffer_decoder( decoder_t *p_dec )
608 {
609     return video_new_buffer( VLC_OBJECT( p_dec ),
610                              (decoder_owner_sys_t *)p_dec->p_owner,
611                              &p_dec->fmt_out );
612 }
613
614 inline static picture_t *video_new_buffer_filter( filter_t *p_filter )
615 {
616     return video_new_buffer( VLC_OBJECT( p_filter ),
617                              (decoder_owner_sys_t *)p_filter->owner.sys,
618                              &p_filter->fmt_out );
619 }
620
621 static picture_t *video_new_buffer( vlc_object_t *p_this,
622                                     decoder_owner_sys_t *p_sys,
623                                     es_format_t *fmt_out )
624 {
625     VLC_UNUSED(p_this);
626     if( fmt_out->video.i_width != p_sys->video.i_width ||
627         fmt_out->video.i_height != p_sys->video.i_height ||
628         fmt_out->video.i_chroma != p_sys->video.i_chroma ||
629         (int64_t)fmt_out->video.i_sar_num * p_sys->video.i_sar_den !=
630         (int64_t)fmt_out->video.i_sar_den * p_sys->video.i_sar_num )
631     {
632         vlc_ureduce( &fmt_out->video.i_sar_num,
633                      &fmt_out->video.i_sar_den,
634                      fmt_out->video.i_sar_num,
635                      fmt_out->video.i_sar_den, 0 );
636
637         if( !fmt_out->video.i_visible_width ||
638             !fmt_out->video.i_visible_height )
639         {
640             fmt_out->video.i_visible_width = fmt_out->video.i_width;
641             fmt_out->video.i_visible_height = fmt_out->video.i_height;
642         }
643
644         fmt_out->video.i_chroma = fmt_out->i_codec;
645         p_sys->video = fmt_out->video;
646     }
647
648     /* */
649     fmt_out->video.i_chroma = fmt_out->i_codec;
650
651     return picture_NewFromFormat( &fmt_out->video );
652 }
653
654 inline static void video_del_buffer_decoder( decoder_t *p_this,
655                                              picture_t *p_pic )
656 {
657     VLC_UNUSED(p_this);
658     picture_Release( p_pic );
659 }
660
661 inline static void video_del_buffer_filter( filter_t *p_this,
662                                             picture_t *p_pic )
663 {
664     VLC_UNUSED(p_this);
665     picture_Release( p_pic );
666 }
667
668 static void video_link_picture_decoder( decoder_t *p_dec, picture_t *p_pic )
669 {
670     VLC_UNUSED(p_dec);
671     picture_Hold( p_pic );
672 }
673
674 static void video_unlink_picture_decoder( decoder_t *p_dec, picture_t *p_pic )
675 {
676     VLC_UNUSED(p_dec);
677     picture_Release( p_pic );
678 }
679
680
681 /**********************************************************************
682  * Callback to update (some) params on the fly
683  **********************************************************************/
684 static int HeightCallback( vlc_object_t *p_this, char const *psz_var,
685                            vlc_value_t oldval, vlc_value_t newval,
686                            void *p_data )
687 {
688     VLC_UNUSED(p_this); VLC_UNUSED(oldval); VLC_UNUSED(psz_var);
689     sout_stream_t *p_stream = (sout_stream_t *)p_data;
690     sout_stream_sys_t *p_sys = p_stream->p_sys;
691
692     /* We create the handler before updating the value in p_sys
693      * so we don't have to worry about locking */
694     if( !p_sys->p_image && newval.i_int )
695         p_sys->p_image = image_HandlerCreate( p_stream );
696     p_sys->i_height = newval.i_int;
697
698     return VLC_SUCCESS;
699 }
700
701 static int WidthCallback( vlc_object_t *p_this, char const *psz_var,
702                            vlc_value_t oldval, vlc_value_t newval,
703                            void *p_data )
704 {
705     VLC_UNUSED(p_this); VLC_UNUSED(oldval); VLC_UNUSED(psz_var);
706     sout_stream_t *p_stream = (sout_stream_t *)p_data;
707     sout_stream_sys_t *p_sys = p_stream->p_sys;
708
709     /* We create the handler before updating the value in p_sys
710      * so we don't have to worry about locking */
711     if( !p_sys->p_image && newval.i_int )
712         p_sys->p_image = image_HandlerCreate( p_stream );
713     p_sys->i_width = newval.i_int;
714
715     return VLC_SUCCESS;
716 }
717
718 static int alphaCallback( vlc_object_t *p_this, char const *psz_var,
719                           vlc_value_t oldval, vlc_value_t newval,
720                           void *p_data )
721 {
722     VLC_UNUSED(p_this); VLC_UNUSED(oldval); VLC_UNUSED(psz_var);
723     sout_stream_t *p_stream = (sout_stream_t *)p_data;
724     sout_stream_sys_t *p_sys = p_stream->p_sys;
725
726     if( p_sys->p_es )
727         p_sys->p_es->i_alpha = newval.i_int;
728
729     return VLC_SUCCESS;
730 }
731
732 static int xCallback( vlc_object_t *p_this, char const *psz_var,
733                       vlc_value_t oldval, vlc_value_t newval,
734                       void *p_data )
735 {
736     VLC_UNUSED(p_this); VLC_UNUSED(oldval); VLC_UNUSED(psz_var);
737     sout_stream_t *p_stream = (sout_stream_t *)p_data;
738     sout_stream_sys_t *p_sys = p_stream->p_sys;
739
740     if( p_sys->p_es )
741         p_sys->p_es->i_x = newval.i_int;
742
743     return VLC_SUCCESS;
744 }
745
746 static int yCallback( vlc_object_t *p_this, char const *psz_var,
747                       vlc_value_t oldval, vlc_value_t newval,
748                       void *p_data )
749 {
750     VLC_UNUSED(p_this); VLC_UNUSED(oldval); VLC_UNUSED(psz_var);
751     sout_stream_t *p_stream = (sout_stream_t *)p_data;
752     sout_stream_sys_t *p_sys = p_stream->p_sys;
753
754     if( p_sys->p_es )
755         p_sys->p_es->i_y = newval.i_int;
756
757     return VLC_SUCCESS;
758 }