* Fix a couple of const, static and other warnings
[vlc.git] / src / misc / image.c
1 /*****************************************************************************
2  * image.c : wrapper for image reading/writing facilities
3  *****************************************************************************
4  * Copyright (C) 2004 the VideoLAN team
5  * $Id$
6  *
7  * Author: Gildas Bazin <gbazin@videolan.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  * \file
26  * This file contains the functions to handle the image_handler_t type
27  */
28
29 /*****************************************************************************
30  * Preamble
31  *****************************************************************************/
32 #include <ctype.h>
33 #include <vlc/vlc.h>
34 #include <vlc_codec.h>
35 #include <vlc_filter.h>
36 #include <vlc_es.h>
37 #include <vlc_image.h>
38 #include <vlc_stream.h>
39 #include <vlc_charset.h>
40
41 static picture_t *ImageRead( image_handler_t *, block_t *,
42                              video_format_t *, video_format_t * );
43 static picture_t *ImageReadUrl( image_handler_t *, const char *,
44                                 video_format_t *, video_format_t * );
45 static block_t *ImageWrite( image_handler_t *, picture_t *,
46                             video_format_t *, video_format_t * );
47 static int ImageWriteUrl( image_handler_t *, picture_t *,
48                           video_format_t *, video_format_t *, const char * );
49
50 static picture_t *ImageConvert( image_handler_t *, picture_t *,
51                                 video_format_t *, video_format_t * );
52 static picture_t *ImageFilter( image_handler_t *, picture_t *,
53                                video_format_t *, const char *psz_module );
54
55 static decoder_t *CreateDecoder( vlc_object_t *, video_format_t * );
56 static void DeleteDecoder( decoder_t * );
57 static encoder_t *CreateEncoder( vlc_object_t *, video_format_t *,
58                                  video_format_t * );
59 static void DeleteEncoder( encoder_t * );
60 static filter_t *CreateFilter( vlc_object_t *, es_format_t *,
61                                video_format_t *, const char * );
62 static void DeleteFilter( filter_t * );
63
64 static vlc_fourcc_t Ext2Fourcc( const char * );
65 /*static const char *Fourcc2Ext( vlc_fourcc_t );*/
66
67 /**
68  * Create an image_handler_t instance
69  *
70  */
71 image_handler_t *__image_HandlerCreate( vlc_object_t *p_this )
72 {
73     image_handler_t *p_image = malloc( sizeof(image_handler_t) );
74
75     memset( p_image, 0, sizeof(image_handler_t) );
76     p_image->p_parent = p_this;
77
78     p_image->pf_read = ImageRead;
79     p_image->pf_read_url = ImageReadUrl;
80     p_image->pf_write = ImageWrite;
81     p_image->pf_write_url = ImageWriteUrl;
82     p_image->pf_convert = ImageConvert;
83     p_image->pf_filter = ImageFilter;
84
85     return p_image;
86 }
87
88 /**
89  * Delete the image_handler_t instance
90  *
91  */
92 void image_HandlerDelete( image_handler_t *p_image )
93 {
94     if( !p_image ) return;
95
96     if( p_image->p_dec ) DeleteDecoder( p_image->p_dec );
97     if( p_image->p_enc ) DeleteEncoder( p_image->p_enc );
98     if( p_image->p_filter ) DeleteFilter( p_image->p_filter );
99
100     free( p_image );
101     p_image = NULL;
102 }
103
104 /**
105  * Read an image
106  *
107  */
108
109 static picture_t *ImageRead( image_handler_t *p_image, block_t *p_block,
110                              video_format_t *p_fmt_in,
111                              video_format_t *p_fmt_out )
112 {
113     picture_t *p_pic = NULL, *p_tmp;
114
115     /* Check if we can reuse the current decoder */
116     if( p_image->p_dec &&
117         p_image->p_dec->fmt_in.i_codec != p_fmt_in->i_chroma )
118     {
119         DeleteDecoder( p_image->p_dec );
120         p_image->p_dec = 0;
121     }
122
123     /* Start a decoder */
124     if( !p_image->p_dec )
125     {
126         p_image->p_dec = CreateDecoder( p_image->p_parent, p_fmt_in );
127         if( !p_image->p_dec ) return NULL;
128     }
129
130     p_block->i_pts = p_block->i_dts = mdate();
131     while( (p_tmp = p_image->p_dec->pf_decode_video( p_image->p_dec, &p_block ))
132              != NULL )
133     {
134         if ( p_pic != NULL )
135             p_pic->pf_release( p_pic );
136         p_pic = p_tmp;
137     }
138
139     if( p_pic == NULL )
140     {
141         msg_Warn( p_image->p_parent, "no image decoded" );
142         return 0;
143     }
144
145     if( !p_fmt_out->i_chroma )
146         p_fmt_out->i_chroma = p_image->p_dec->fmt_out.video.i_chroma;
147     if( !p_fmt_out->i_width && p_fmt_out->i_height )
148         p_fmt_out->i_width = p_fmt_out->i_height
149                               * p_image->p_dec->fmt_out.video.i_aspect
150                               / VOUT_ASPECT_FACTOR;
151     if( !p_fmt_out->i_height && p_fmt_out->i_width )
152         p_fmt_out->i_height = p_fmt_out->i_width * VOUT_ASPECT_FACTOR
153                                / p_image->p_dec->fmt_out.video.i_aspect;
154     if( !p_fmt_out->i_width )
155         p_fmt_out->i_width = p_image->p_dec->fmt_out.video.i_width;
156     if( !p_fmt_out->i_height )
157         p_fmt_out->i_height = p_image->p_dec->fmt_out.video.i_height;
158
159     /* Check if we need chroma conversion or resizing */
160     if( p_image->p_dec->fmt_out.video.i_chroma != p_fmt_out->i_chroma ||
161         p_image->p_dec->fmt_out.video.i_width != p_fmt_out->i_width ||
162         p_image->p_dec->fmt_out.video.i_height != p_fmt_out->i_height )
163     {
164         if( p_image->p_filter )
165         if( p_image->p_filter->fmt_in.video.i_chroma !=
166             p_image->p_dec->fmt_out.video.i_chroma ||
167             p_image->p_filter->fmt_out.video.i_chroma != p_fmt_out->i_chroma )
168         {
169             /* We need to restart a new filter */
170             DeleteFilter( p_image->p_filter );
171             p_image->p_filter = 0;
172         }
173
174         /* Start a filter */
175         if( !p_image->p_filter )
176         {
177             p_image->p_filter =
178                 CreateFilter( p_image->p_parent, &p_image->p_dec->fmt_out,
179                               p_fmt_out, NULL );
180
181             if( !p_image->p_filter )
182             {
183                 p_pic->pf_release( p_pic );
184                 return NULL;
185             }
186         }
187         else
188         {
189             /* Filters should handle on-the-fly size changes */
190             p_image->p_filter->fmt_in = p_image->p_dec->fmt_out;
191             p_image->p_filter->fmt_out = p_image->p_dec->fmt_out;
192             p_image->p_filter->fmt_out.i_codec = p_fmt_out->i_chroma;
193             p_image->p_filter->fmt_out.video = *p_fmt_out;
194         }
195
196         p_pic = p_image->p_filter->pf_video_filter( p_image->p_filter, p_pic );
197         *p_fmt_out = p_image->p_filter->fmt_out.video;
198     }
199     else *p_fmt_out = p_image->p_dec->fmt_out.video;
200
201     return p_pic;
202 }
203
204 static picture_t *ImageReadUrl( image_handler_t *p_image, const char *psz_url,
205                                 video_format_t *p_fmt_in,
206                                 video_format_t *p_fmt_out )
207 {
208     block_t *p_block;
209     picture_t *p_pic;
210     stream_t *p_stream = NULL;
211     int i_size;
212
213     p_stream = stream_UrlNew( p_image->p_parent, psz_url );
214
215     if( !p_stream )
216     {
217         msg_Dbg( p_image->p_parent, "could not open %s for reading",
218                  psz_url );
219         return NULL;
220     }
221
222     i_size = stream_Size( p_stream );
223
224     p_block = block_New( p_image->p_parent, i_size );
225
226     stream_Read( p_stream, p_block->p_buffer, i_size );
227     stream_Delete( p_stream );
228
229     if( !p_fmt_in->i_chroma )
230     {
231         /* Try to guess format from file name */
232         p_fmt_in->i_chroma = Ext2Fourcc( psz_url );
233     }
234
235     p_pic = ImageRead( p_image, p_block, p_fmt_in, p_fmt_out );
236
237     return p_pic;
238 }
239
240 /**
241  * Write an image
242  *
243  */
244
245 static void PicRelease( picture_t *p_pic ){};
246
247 static block_t *ImageWrite( image_handler_t *p_image, picture_t *p_pic,
248                             video_format_t *p_fmt_in,
249                             video_format_t *p_fmt_out )
250 {
251     block_t *p_block;
252     void (*pf_release)( picture_t * );
253
254     /* Check if we can reuse the current encoder */
255     if( p_image->p_enc &&
256         ( p_image->p_enc->fmt_out.i_codec != p_fmt_out->i_chroma ||
257           p_image->p_enc->fmt_out.video.i_width != p_fmt_out->i_width ||
258           p_image->p_enc->fmt_out.video.i_height != p_fmt_out->i_height ) )
259     {
260         DeleteEncoder( p_image->p_enc );
261         p_image->p_enc = 0;
262     }
263
264     /* Start an encoder */
265     if( !p_image->p_enc )
266     {
267         p_image->p_enc = CreateEncoder( p_image->p_parent,
268                                         p_fmt_in, p_fmt_out );
269         if( !p_image->p_enc ) return NULL;
270     }
271
272     /* Check if we need chroma conversion or resizing */
273     if( p_image->p_enc->fmt_in.video.i_chroma != p_fmt_in->i_chroma ||
274         p_image->p_enc->fmt_in.video.i_width != p_fmt_in->i_width ||
275         p_image->p_enc->fmt_in.video.i_height != p_fmt_in->i_height )
276     {
277         picture_t *p_tmp_pic;
278
279         if( p_image->p_filter )
280         if( p_image->p_filter->fmt_in.video.i_chroma != p_fmt_in->i_chroma ||
281             p_image->p_filter->fmt_out.video.i_chroma !=
282             p_image->p_enc->fmt_in.video.i_chroma )
283         {
284             /* We need to restart a new filter */
285             DeleteFilter( p_image->p_filter );
286             p_image->p_filter = 0;
287         }
288
289         /* Start a filter */
290         if( !p_image->p_filter )
291         {
292             es_format_t fmt_in;
293             es_format_Init( &fmt_in, VIDEO_ES, p_fmt_in->i_chroma );
294             fmt_in.video = *p_fmt_in;
295
296             p_image->p_filter =
297                 CreateFilter( p_image->p_parent, &fmt_in,
298                               &p_image->p_enc->fmt_in.video, NULL );
299
300             if( !p_image->p_filter )
301             {
302                 return NULL;
303             }
304         }
305         else
306         {
307             /* Filters should handle on-the-fly size changes */
308             p_image->p_filter->fmt_in.i_codec = p_fmt_in->i_chroma;
309             p_image->p_filter->fmt_out.video = *p_fmt_in;
310             p_image->p_filter->fmt_out.i_codec =p_image->p_enc->fmt_in.i_codec;
311             p_image->p_filter->fmt_out.video = p_image->p_enc->fmt_in.video;
312         }
313
314         pf_release = p_pic->pf_release;
315         p_pic->pf_release = PicRelease; /* Small hack */
316         p_tmp_pic =
317             p_image->p_filter->pf_video_filter( p_image->p_filter, p_pic );
318         p_pic->pf_release = pf_release;
319
320         p_block = p_image->p_enc->pf_encode_video( p_image->p_enc, p_tmp_pic );
321
322         p_image->p_filter->pf_vout_buffer_del( p_image->p_filter, p_tmp_pic );
323     }
324     else
325     {
326         p_block = p_image->p_enc->pf_encode_video( p_image->p_enc, p_pic );
327     }
328
329     if( !p_block )
330     {
331         msg_Dbg( p_image->p_parent, "no image encoded" );
332         return 0;
333     }
334
335     return p_block;
336 }
337
338 static int ImageWriteUrl( image_handler_t *p_image, picture_t *p_pic,
339                           video_format_t *p_fmt_in, video_format_t *p_fmt_out,
340                           const char *psz_url )
341 {
342     block_t *p_block;
343     FILE *file;
344
345     if( !p_fmt_out->i_chroma )
346     {
347         /* Try to guess format from file name */
348         p_fmt_out->i_chroma = Ext2Fourcc( psz_url );
349     }
350
351     file = utf8_fopen( psz_url, "wb" );
352     if( !file )
353     {
354         msg_Dbg( p_image->p_parent, "could not open file %s for writing",
355                  psz_url );
356         return VLC_EGENERIC;
357     }
358
359     p_block = ImageWrite( p_image, p_pic, p_fmt_in, p_fmt_out );
360
361     if( p_block )
362     {
363         fwrite( p_block->p_buffer, sizeof(char), p_block->i_buffer, file );
364         block_Release( p_block );
365     }
366
367     fclose( file );
368
369     return p_block ? VLC_SUCCESS : VLC_EGENERIC;
370 }
371
372 /**
373  * Convert an image to a different format
374  *
375  */
376
377 static picture_t *ImageConvert( image_handler_t *p_image, picture_t *p_pic,
378                                 video_format_t *p_fmt_in,
379                                 video_format_t *p_fmt_out )
380 {
381     void (*pf_release)( picture_t * );
382     picture_t *p_pif;
383
384     if( !p_fmt_out->i_width && !p_fmt_out->i_height &&
385         p_fmt_out->i_sar_num && p_fmt_out->i_sar_den &&
386         p_fmt_out->i_sar_num * p_fmt_in->i_sar_den !=
387         p_fmt_out->i_sar_den * p_fmt_in->i_sar_num )
388     {
389         p_fmt_out->i_width =
390             p_fmt_in->i_sar_num * (int64_t)p_fmt_out->i_sar_den *
391             p_fmt_in->i_width / p_fmt_in->i_sar_den / p_fmt_out->i_sar_num;
392         p_fmt_out->i_visible_width =
393             p_fmt_in->i_sar_num * (int64_t)p_fmt_out->i_sar_den *
394             p_fmt_in->i_visible_width / p_fmt_in->i_sar_den /
395             p_fmt_out->i_sar_num;
396     }
397
398     if( !p_fmt_out->i_chroma ) p_fmt_out->i_chroma = p_fmt_in->i_chroma;
399     if( !p_fmt_out->i_width )
400         p_fmt_out->i_width = p_fmt_out->i_visible_width = p_fmt_in->i_width;
401     if( !p_fmt_out->i_height )
402         p_fmt_out->i_height = p_fmt_out->i_visible_height = p_fmt_in->i_height;
403     if( !p_fmt_out->i_sar_num ) p_fmt_out->i_sar_num = p_fmt_in->i_sar_num;
404     if( !p_fmt_out->i_sar_den ) p_fmt_out->i_sar_den = p_fmt_in->i_sar_den;
405     if( !p_fmt_out->i_aspect ) p_fmt_out->i_aspect = p_fmt_in->i_aspect;
406
407     if( p_image->p_filter )
408     if( p_image->p_filter->fmt_in.video.i_chroma != p_fmt_in->i_chroma ||
409         p_image->p_filter->fmt_out.video.i_chroma != p_fmt_out->i_chroma )
410     {
411         /* We need to restart a new filter */
412         DeleteFilter( p_image->p_filter );
413         p_image->p_filter = NULL;
414     }
415
416     /* Start a filter */
417     if( !p_image->p_filter )
418     {
419         es_format_t fmt_in;
420         es_format_Init( &fmt_in, VIDEO_ES, p_fmt_in->i_chroma );
421         fmt_in.video = *p_fmt_in;
422
423         p_image->p_filter =
424             CreateFilter( p_image->p_parent, &fmt_in, p_fmt_out, NULL );
425
426         if( !p_image->p_filter )
427         {
428             return NULL;
429         }
430     }
431     else
432     {
433         /* Filters should handle on-the-fly size changes */
434         p_image->p_filter->fmt_in.video = *p_fmt_in;
435         p_image->p_filter->fmt_out.video = *p_fmt_out;
436     }
437
438     pf_release = p_pic->pf_release;
439     p_pic->pf_release = PicRelease; /* Small hack */
440     p_pif = p_image->p_filter->pf_video_filter( p_image->p_filter, p_pic );
441     p_pic->pf_release = pf_release;
442
443     if( p_fmt_in->i_chroma == p_fmt_out->i_chroma &&
444         p_fmt_in->i_width == p_fmt_out->i_width &&
445         p_fmt_in->i_height == p_fmt_out->i_height )
446     {
447         /* Duplicate image */
448         p_pif = p_image->p_filter->pf_vout_buffer_new( p_image->p_filter );
449         if( p_pif ) vout_CopyPicture( p_image->p_parent, p_pif, p_pic );
450     }
451
452     return p_pif;
453 }
454
455 /**
456  * Filter an image with a psz_module filter
457  *
458  */
459
460 static picture_t *ImageFilter( image_handler_t *p_image, picture_t *p_pic,
461                                video_format_t *p_fmt, const char *psz_module )
462 {
463     void (*pf_release)( picture_t * );
464     picture_t *p_pif;
465
466     /* Start a filter */
467     if( !p_image->p_filter )
468     {
469         es_format_t fmt;
470         es_format_Init( &fmt, VIDEO_ES, p_fmt->i_chroma );
471         fmt.video = *p_fmt;
472
473         p_image->p_filter =
474             CreateFilter( p_image->p_parent, &fmt, &fmt.video, psz_module );
475
476         if( !p_image->p_filter )
477         {
478             return NULL;
479         }
480     }
481     else
482     {
483         /* Filters should handle on-the-fly size changes */
484         p_image->p_filter->fmt_in.video = *p_fmt;
485         p_image->p_filter->fmt_out.video = *p_fmt;
486     }
487
488     pf_release = p_pic->pf_release;
489     p_pic->pf_release = PicRelease; /* Small hack */
490     p_pif = p_image->p_filter->pf_video_filter( p_image->p_filter, p_pic );
491     p_pic->pf_release = pf_release;
492
493     return p_pif;
494 }
495
496 /**
497  * Misc functions
498  *
499  */
500 static struct
501 {
502     vlc_fourcc_t i_codec;
503     const char *psz_ext;
504
505 } ext_table[] =
506 {
507     { VLC_FOURCC('j','p','e','g'), "jpeg" },
508     { VLC_FOURCC('j','p','e','g'), "jpg"  },
509     { VLC_FOURCC('l','j','p','g'), "ljpg" },
510     { VLC_FOURCC('p','n','g',' '), "png" },
511     { VLC_FOURCC('p','g','m',' '), "pgm" },
512     { VLC_FOURCC('p','g','m','y'), "pgmyuv" },
513     { VLC_FOURCC('p','b','m',' '), "pbm" },
514     { VLC_FOURCC('p','a','m',' '), "pam" },
515     { VLC_FOURCC('t','g','a',' '), "tga" },
516     { VLC_FOURCC('b','m','p',' '), "bmp" },
517     { VLC_FOURCC('p','n','m',' '), "pnm" },
518     { VLC_FOURCC('x','p','m',' '), "xpm" },
519     { VLC_FOURCC('x','c','f',' '), "xcf" },
520     { VLC_FOURCC('p','c','x',' '), "pcx" },
521     { VLC_FOURCC('g','i','f',' '), "gif" },
522     { VLC_FOURCC('t','i','f','f'), "tif" },
523     { VLC_FOURCC('t','i','f','f'), "tiff" },
524     { VLC_FOURCC('l','b','m',' '), "lbm" },
525     { 0, NULL }
526 };
527
528 static vlc_fourcc_t Ext2Fourcc( const char *psz_name )
529 {
530     int i;
531
532     psz_name = strrchr( psz_name, '.' );
533     if( !psz_name ) return 0;
534     psz_name++;
535
536     for( i = 0; ext_table[i].i_codec; i++ )
537     {
538         int j;
539         for( j = 0; toupper(ext_table[i].psz_ext[j]) == toupper(psz_name[j]);
540              j++ )
541         {
542             if( !ext_table[i].psz_ext[j] && !psz_name[j] )
543                 return ext_table[i].i_codec;
544         }
545     }
546
547     return 0;
548 }
549
550 /*
551 static const char *Fourcc2Ext( vlc_fourcc_t i_codec )
552 {
553     int i;
554
555     for( i = 0; ext_table[i].i_codec != 0; i++ )
556     {
557         if( ext_table[i].i_codec == i_codec ) return ext_table[i].psz_ext;
558     }
559
560     return NULL;
561 }
562 */
563
564 static void video_release_buffer( picture_t *p_pic )
565 {
566     if( p_pic && p_pic->p_data_orig ) free( p_pic->p_data_orig );
567     if( p_pic && p_pic->p_sys ) free( p_pic->p_sys );
568     if( p_pic ) free( p_pic );
569 }
570
571 static picture_t *video_new_buffer( decoder_t *p_dec )
572 {
573     picture_t *p_pic = malloc( sizeof(picture_t) );
574
575     p_dec->fmt_out.video.i_chroma = p_dec->fmt_out.i_codec;
576     vout_AllocatePicture( VLC_OBJECT(p_dec), p_pic,
577                           p_dec->fmt_out.video.i_chroma,
578                           p_dec->fmt_out.video.i_width,
579                           p_dec->fmt_out.video.i_height,
580                           p_dec->fmt_out.video.i_aspect );
581
582     if( !p_pic->i_planes )
583     {
584         free( p_pic );
585         return 0;
586     }
587
588     p_pic->pf_release = video_release_buffer;
589     p_pic->i_status = RESERVED_PICTURE;
590     p_pic->p_sys = NULL;
591
592     return p_pic;
593 }
594
595 static void video_del_buffer( decoder_t *p_dec, picture_t *p_pic )
596 {
597     if( p_pic && p_pic->p_data_orig ) free( p_pic->p_data_orig );
598     if( p_pic && p_pic->p_sys ) free( p_pic->p_sys );
599     if( p_pic ) free( p_pic );
600 }
601
602 static void video_link_picture( decoder_t *p_dec, picture_t *p_pic )
603 {
604 }
605
606 static void video_unlink_picture( decoder_t *p_dec, picture_t *p_pic )
607 {
608 }
609
610 static decoder_t *CreateDecoder( vlc_object_t *p_this, video_format_t *fmt )
611 {
612     decoder_t *p_dec;
613
614     p_dec = vlc_object_create( p_this, VLC_OBJECT_DECODER );
615     if( p_dec == NULL )
616     {
617         msg_Err( p_this, "out of memory" );
618         return NULL;
619     }
620
621     p_dec->p_module = NULL;
622     es_format_Init( &p_dec->fmt_in, VIDEO_ES, fmt->i_chroma );
623     es_format_Init( &p_dec->fmt_out, VIDEO_ES, 0 );
624     p_dec->fmt_in.video = *fmt;
625     p_dec->b_pace_control = VLC_TRUE;
626
627     p_dec->pf_vout_buffer_new = video_new_buffer;
628     p_dec->pf_vout_buffer_del = video_del_buffer;
629     p_dec->pf_picture_link    = video_link_picture;
630     p_dec->pf_picture_unlink  = video_unlink_picture;
631
632     vlc_object_attach( p_dec, p_this );
633
634     /* Find a suitable decoder module */
635     p_dec->p_module = module_Need( p_dec, "decoder", "$codec", 0 );
636     if( !p_dec->p_module )
637     {
638         msg_Err( p_dec, "no suitable decoder module for fourcc `%4.4s'.\n"
639                  "VLC probably does not support this image format.",
640                  (char*)&p_dec->fmt_in.i_codec );
641
642         DeleteDecoder( p_dec );
643         return NULL;
644     }
645
646     return p_dec;
647 }
648
649 static void DeleteDecoder( decoder_t * p_dec )
650 {
651     vlc_object_detach( p_dec );
652
653     if( p_dec->p_module ) module_Unneed( p_dec, p_dec->p_module );
654
655     es_format_Clean( &p_dec->fmt_in );
656     es_format_Clean( &p_dec->fmt_out );
657
658     vlc_object_destroy( p_dec );
659     p_dec = NULL;
660 }
661
662 static encoder_t *CreateEncoder( vlc_object_t *p_this, video_format_t *fmt_in,
663                                  video_format_t *fmt_out )
664 {
665     encoder_t *p_enc;
666
667     p_enc = vlc_object_create( p_this, VLC_OBJECT_ENCODER );
668     if( p_enc == NULL )
669     {
670         msg_Err( p_this, "out of memory" );
671         return NULL;
672     }
673
674     p_enc->p_module = NULL;
675     es_format_Init( &p_enc->fmt_in, VIDEO_ES, fmt_in->i_chroma );
676     p_enc->fmt_in.video = *fmt_in;
677     if( fmt_out->i_width > 0 && fmt_out->i_height > 0 )
678     {
679         p_enc->fmt_in.video.i_width = fmt_out->i_width;
680         p_enc->fmt_in.video.i_height = fmt_out->i_height;
681
682         if( fmt_out->i_visible_width > 0 &&
683             fmt_out->i_visible_height > 0 )
684         {
685             p_enc->fmt_in.video.i_visible_width = fmt_out->i_visible_width;
686             p_enc->fmt_in.video.i_visible_height = fmt_out->i_visible_height;
687         }
688         else
689         {
690             p_enc->fmt_in.video.i_visible_width = fmt_out->i_width;
691             p_enc->fmt_in.video.i_visible_height = fmt_out->i_height;
692         }
693     }
694     else if( fmt_out->i_sar_num && fmt_out->i_sar_den &&
695              fmt_out->i_sar_num * fmt_in->i_sar_den !=
696              fmt_out->i_sar_den * fmt_in->i_sar_num )
697     {
698         p_enc->fmt_in.video.i_width =
699             fmt_in->i_sar_num * (int64_t)fmt_out->i_sar_den * fmt_in->i_width /
700             fmt_in->i_sar_den / fmt_out->i_sar_num;
701         p_enc->fmt_in.video.i_visible_width =
702             fmt_in->i_sar_num * (int64_t)fmt_out->i_sar_den *
703             fmt_in->i_visible_width / fmt_in->i_sar_den / fmt_out->i_sar_num;
704     }
705
706     p_enc->fmt_in.video.i_frame_rate = 25;
707     p_enc->fmt_in.video.i_frame_rate_base = 1;
708
709     es_format_Init( &p_enc->fmt_out, VIDEO_ES, fmt_out->i_chroma );
710     p_enc->fmt_out.video = *fmt_out;
711     p_enc->fmt_out.video.i_width = p_enc->fmt_in.video.i_width;
712     p_enc->fmt_out.video.i_height = p_enc->fmt_in.video.i_height;
713
714     vlc_object_attach( p_enc, p_this );
715
716     /* Find a suitable decoder module */
717     p_enc->p_module = module_Need( p_enc, "encoder", 0, 0 );
718     if( !p_enc->p_module )
719     {
720         msg_Err( p_enc, "no suitable encoder module for fourcc `%4.4s'.\n"
721                  "VLC probably does not support this image format.",
722                  (char*)&p_enc->fmt_out.i_codec );
723
724         DeleteEncoder( p_enc );
725         return NULL;
726     }
727     p_enc->fmt_in.video.i_chroma = p_enc->fmt_in.i_codec;
728
729     return p_enc;
730 }
731
732 static void DeleteEncoder( encoder_t * p_enc )
733 {
734     vlc_object_detach( p_enc );
735
736     if( p_enc->p_module ) module_Unneed( p_enc, p_enc->p_module );
737
738     es_format_Clean( &p_enc->fmt_in );
739     es_format_Clean( &p_enc->fmt_out );
740
741     vlc_object_destroy( p_enc );
742     p_enc = NULL;
743 }
744
745 static filter_t *CreateFilter( vlc_object_t *p_this, es_format_t *p_fmt_in,
746                                video_format_t *p_fmt_out,
747                                const char *psz_module )
748 {
749     filter_t *p_filter;
750
751     p_filter = vlc_object_create( p_this, VLC_OBJECT_FILTER );
752     vlc_object_attach( p_filter, p_this );
753
754     p_filter->pf_vout_buffer_new =
755         (picture_t *(*)(filter_t *))video_new_buffer;
756     p_filter->pf_vout_buffer_del =
757         (void (*)(filter_t *, picture_t *))video_del_buffer;
758
759     p_filter->fmt_in = *p_fmt_in;
760     p_filter->fmt_out = *p_fmt_in;
761     p_filter->fmt_out.i_codec = p_fmt_out->i_chroma;
762     p_filter->fmt_out.video = *p_fmt_out;
763     p_filter->p_module = module_Need( p_filter, "video filter2",
764                                       psz_module, 0 );
765
766     if( !p_filter->p_module )
767     {
768         msg_Dbg( p_filter, "no video filter found" );
769         DeleteFilter( p_filter );
770         return NULL;
771     }
772
773     return p_filter;
774 }
775
776 static void DeleteFilter( filter_t * p_filter )
777 {
778     vlc_object_detach( p_filter );
779
780     if( p_filter->p_module ) module_Unneed( p_filter, p_filter->p_module );
781
782     es_format_Clean( &p_filter->fmt_in );
783     es_format_Clean( &p_filter->fmt_out );
784
785     vlc_object_destroy( p_filter );
786     p_filter = NULL;
787 }