git.sesse.net Git - vlc/blob - src/misc/image.c

   1 /*****************************************************************************
   2  * image.c : wrapper for image reading/writing facilities
   3  *****************************************************************************
   4  * Copyright (C) 2004-2007 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
  33 #ifdef HAVE_CONFIG_H
  34 # include "config.h"
  35 #endif
  36
  37 #include <ctype.h>
  38 #include <errno.h>
  39
  40 #include <vlc_common.h>
  41 #include <vlc_codec.h>
  42 #include <vlc_filter.h>
  43 #include <vlc_es.h>
  44 #include <vlc_image.h>
  45 #include <vlc_stream.h>
  46 #include <vlc_charset.h>
  47 #include <libvlc.h>
  48
  49 static picture_t *ImageRead( image_handler_t *, block_t *,
  50                              video_format_t *, video_format_t * );
  51 static picture_t *ImageReadUrl( image_handler_t *, const char *,
  52                                 video_format_t *, video_format_t * );
  53 static block_t *ImageWrite( image_handler_t *, picture_t *,
  54                             video_format_t *, video_format_t * );
  55 static int ImageWriteUrl( image_handler_t *, picture_t *,
  56                           video_format_t *, video_format_t *, const char * );
  57
  58 static picture_t *ImageConvert( image_handler_t *, picture_t *,
  59                                 video_format_t *, video_format_t * );
  60 static picture_t *ImageFilter( image_handler_t *, picture_t *,
  61                                video_format_t *, const char *psz_module );
  62
  63 static decoder_t *CreateDecoder( vlc_object_t *, video_format_t * );
  64 static void DeleteDecoder( decoder_t * );
  65 static encoder_t *CreateEncoder( vlc_object_t *, video_format_t *,
  66                                  video_format_t * );
  67 static void DeleteEncoder( encoder_t * );
  68 static filter_t *CreateFilter( vlc_object_t *, es_format_t *,
  69                                video_format_t *, const char * );
  70 static void DeleteFilter( filter_t * );
  71
  72 static vlc_fourcc_t Ext2Fourcc( const char * );
  73 /*static const char *Fourcc2Ext( vlc_fourcc_t );*/
  74
  75 /**
  76  * Create an image_handler_t instance
  77  *
  78  */
  79 image_handler_t *__image_HandlerCreate( vlc_object_t *p_this )
  80 {
  81     image_handler_t *p_image = malloc( sizeof(image_handler_t) );
  82
  83     memset( p_image, 0, sizeof(image_handler_t) );
  84     p_image->p_parent = p_this;
  85
  86     p_image->pf_read = ImageRead;
  87     p_image->pf_read_url = ImageReadUrl;
  88     p_image->pf_write = ImageWrite;
  89     p_image->pf_write_url = ImageWriteUrl;
  90     p_image->pf_convert = ImageConvert;
  91     p_image->pf_filter = ImageFilter;
  92
  93     return p_image;
  94 }
  95
  96 /**
  97  * Delete the image_handler_t instance
  98  *
  99  */
 100 void image_HandlerDelete( image_handler_t *p_image )
 101 {
 102     if( !p_image ) return;
 103
 104     if( p_image->p_dec ) DeleteDecoder( p_image->p_dec );
 105     if( p_image->p_enc ) DeleteEncoder( p_image->p_enc );
 106     if( p_image->p_filter ) DeleteFilter( p_image->p_filter );
 107
 108     free( p_image );
 109     p_image = NULL;
 110 }
 111
 112 /**
 113  * Read an image
 114  *
 115  */
 116
 117 static picture_t *ImageRead( image_handler_t *p_image, block_t *p_block,
 118                              video_format_t *p_fmt_in,
 119                              video_format_t *p_fmt_out )
 120 {
 121     picture_t *p_pic = NULL, *p_tmp;
 122
 123     /* Check if we can reuse the current decoder */
 124     if( p_image->p_dec &&
 125         p_image->p_dec->fmt_in.i_codec != p_fmt_in->i_chroma )
 126     {
 127         DeleteDecoder( p_image->p_dec );
 128         p_image->p_dec = 0;
 129     }
 130
 131     /* Start a decoder */
 132     if( !p_image->p_dec )
 133     {
 134         p_image->p_dec = CreateDecoder( p_image->p_parent, p_fmt_in );
 135         if( !p_image->p_dec ) return NULL;
 136     }
 137
 138     p_block->i_pts = p_block->i_dts = mdate();
 139     while( (p_tmp = p_image->p_dec->pf_decode_video( p_image->p_dec, &p_block ))
 140              != NULL )
 141     {
 142         if( p_pic != NULL )
 143             picture_Release( p_pic );
 144         p_pic = p_tmp;
 145     }
 146
 147     if( p_pic == NULL )
 148     {
 149         msg_Warn( p_image->p_parent, "no image decoded" );
 150         return 0;
 151     }
 152
 153     if( !p_fmt_out->i_chroma )
 154         p_fmt_out->i_chroma = p_image->p_dec->fmt_out.video.i_chroma;
 155     if( !p_fmt_out->i_width && p_fmt_out->i_height )
 156         p_fmt_out->i_width = p_fmt_out->i_height
 157                               * p_image->p_dec->fmt_out.video.i_aspect
 158                               / VOUT_ASPECT_FACTOR;
 159     if( !p_fmt_out->i_height && p_fmt_out->i_width )
 160         p_fmt_out->i_height = p_fmt_out->i_width * VOUT_ASPECT_FACTOR
 161                                / p_image->p_dec->fmt_out.video.i_aspect;
 162     if( !p_fmt_out->i_width )
 163         p_fmt_out->i_width = p_image->p_dec->fmt_out.video.i_width;
 164     if( !p_fmt_out->i_height )
 165         p_fmt_out->i_height = p_image->p_dec->fmt_out.video.i_height;
 166
 167     /* Check if we need chroma conversion or resizing */
 168     if( p_image->p_dec->fmt_out.video.i_chroma != p_fmt_out->i_chroma ||
 169         p_image->p_dec->fmt_out.video.i_width != p_fmt_out->i_width ||
 170         p_image->p_dec->fmt_out.video.i_height != p_fmt_out->i_height )
 171     {
 172         if( p_image->p_filter )
 173         if( p_image->p_filter->fmt_in.video.i_chroma !=
 174             p_image->p_dec->fmt_out.video.i_chroma ||
 175             p_image->p_filter->fmt_out.video.i_chroma != p_fmt_out->i_chroma )
 176         {
 177             /* We need to restart a new filter */
 178             DeleteFilter( p_image->p_filter );
 179             p_image->p_filter = 0;
 180         }
 181
 182         /* Start a filter */
 183         if( !p_image->p_filter )
 184         {
 185             p_image->p_filter =
 186                 CreateFilter( p_image->p_parent, &p_image->p_dec->fmt_out,
 187                               p_fmt_out, NULL );
 188
 189             if( !p_image->p_filter )
 190             {
 191                 picture_Release( p_pic );
 192                 return NULL;
 193             }
 194         }
 195         else
 196         {
 197             /* Filters should handle on-the-fly size changes */
 198             p_image->p_filter->fmt_in = p_image->p_dec->fmt_out;
 199             p_image->p_filter->fmt_out = p_image->p_dec->fmt_out;
 200             p_image->p_filter->fmt_out.i_codec = p_fmt_out->i_chroma;
 201             p_image->p_filter->fmt_out.video = *p_fmt_out;
 202         }
 203
 204         p_pic = p_image->p_filter->pf_video_filter( p_image->p_filter, p_pic );
 205         *p_fmt_out = p_image->p_filter->fmt_out.video;
 206     }
 207     else *p_fmt_out = p_image->p_dec->fmt_out.video;
 208
 209     return p_pic;
 210 }
 211
 212 static picture_t *ImageReadUrl( image_handler_t *p_image, const char *psz_url,
 213                                 video_format_t *p_fmt_in,
 214                                 video_format_t *p_fmt_out )
 215 {
 216     block_t *p_block;
 217     picture_t *p_pic;
 218     stream_t *p_stream = NULL;
 219     int i_size;
 220
 221     p_stream = stream_UrlNew( p_image->p_parent, psz_url );
 222
 223     if( !p_stream )
 224     {
 225         msg_Dbg( p_image->p_parent, "could not open %s for reading",
 226                  psz_url );
 227         return NULL;
 228     }
 229
 230     i_size = stream_Size( p_stream );
 231
 232     p_block = block_New( p_image->p_parent, i_size );
 233
 234     stream_Read( p_stream, p_block->p_buffer, i_size );
 235     stream_Delete( p_stream );
 236
 237     if( !p_fmt_in->i_chroma )
 238     {
 239         /* Try to guess format from file name */
 240         p_fmt_in->i_chroma = Ext2Fourcc( psz_url );
 241     }
 242
 243     p_pic = ImageRead( p_image, p_block, p_fmt_in, p_fmt_out );
 244
 245     return p_pic;
 246 }
 247
 248 /**
 249  * Write an image
 250  *
 251  */
 252
 253 static block_t *ImageWrite( image_handler_t *p_image, picture_t *p_pic,
 254                             video_format_t *p_fmt_in,
 255                             video_format_t *p_fmt_out )
 256 {
 257     block_t *p_block;
 258
 259     /* Check if we can reuse the current encoder */
 260     if( p_image->p_enc &&
 261         ( p_image->p_enc->fmt_out.i_codec != p_fmt_out->i_chroma ||
 262           p_image->p_enc->fmt_out.video.i_width != p_fmt_out->i_width ||
 263           p_image->p_enc->fmt_out.video.i_height != p_fmt_out->i_height ) )
 264     {
 265         DeleteEncoder( p_image->p_enc );
 266         p_image->p_enc = 0;
 267     }
 268
 269     /* Start an encoder */
 270     if( !p_image->p_enc )
 271     {
 272         p_image->p_enc = CreateEncoder( p_image->p_parent,
 273                                         p_fmt_in, p_fmt_out );
 274         if( !p_image->p_enc ) return NULL;
 275     }
 276
 277     /* Check if we need chroma conversion or resizing */
 278     if( p_image->p_enc->fmt_in.video.i_chroma != p_fmt_in->i_chroma ||
 279         p_image->p_enc->fmt_in.video.i_width != p_fmt_in->i_width ||
 280         p_image->p_enc->fmt_in.video.i_height != p_fmt_in->i_height )
 281     {
 282         picture_t *p_tmp_pic;
 283
 284         if( p_image->p_filter )
 285         if( p_image->p_filter->fmt_in.video.i_chroma != p_fmt_in->i_chroma ||
 286             p_image->p_filter->fmt_out.video.i_chroma !=
 287             p_image->p_enc->fmt_in.video.i_chroma )
 288         {
 289             /* We need to restart a new filter */
 290             DeleteFilter( p_image->p_filter );
 291             p_image->p_filter = 0;
 292         }
 293
 294         /* Start a filter */
 295         if( !p_image->p_filter )
 296         {
 297             es_format_t fmt_in;
 298             es_format_Init( &fmt_in, VIDEO_ES, p_fmt_in->i_chroma );
 299             fmt_in.video = *p_fmt_in;
 300
 301             p_image->p_filter =
 302                 CreateFilter( p_image->p_parent, &fmt_in,
 303                               &p_image->p_enc->fmt_in.video, NULL );
 304
 305             if( !p_image->p_filter )
 306             {
 307                 return NULL;
 308             }
 309         }
 310         else
 311         {
 312             /* Filters should handle on-the-fly size changes */
 313             p_image->p_filter->fmt_in.i_codec = p_fmt_in->i_chroma;
 314             p_image->p_filter->fmt_out.video = *p_fmt_in;
 315             p_image->p_filter->fmt_out.i_codec =p_image->p_enc->fmt_in.i_codec;
 316             p_image->p_filter->fmt_out.video = p_image->p_enc->fmt_in.video;
 317         }
 318
 319         picture_Yield( p_pic );
 320
 321         p_tmp_pic =
 322             p_image->p_filter->pf_video_filter( p_image->p_filter, p_pic );
 323
 324         p_block = p_image->p_enc->pf_encode_video( p_image->p_enc, p_tmp_pic );
 325
 326         p_image->p_filter->pf_vout_buffer_del( p_image->p_filter, p_tmp_pic );
 327     }
 328     else
 329     {
 330         p_block = p_image->p_enc->pf_encode_video( p_image->p_enc, p_pic );
 331     }
 332
 333     if( !p_block )
 334     {
 335         msg_Dbg( p_image->p_parent, "no image encoded" );
 336         return 0;
 337     }
 338
 339     return p_block;
 340 }
 341
 342 static int ImageWriteUrl( image_handler_t *p_image, picture_t *p_pic,
 343                           video_format_t *p_fmt_in, video_format_t *p_fmt_out,
 344                           const char *psz_url )
 345 {
 346     block_t *p_block;
 347     FILE *file;
 348
 349     if( !p_fmt_out->i_chroma )
 350     {
 351         /* Try to guess format from file name */
 352         p_fmt_out->i_chroma = Ext2Fourcc( psz_url );
 353     }
 354
 355     file = utf8_fopen( psz_url, "wb" );
 356     if( !file )
 357     {
 358         msg_Err( p_image->p_parent, "%s: %m", psz_url );
 359         return VLC_EGENERIC;
 360     }
 361
 362     p_block = ImageWrite( p_image, p_pic, p_fmt_in, p_fmt_out );
 363
 364     int err = 0;
 365     if( p_block )
 366     {
 367         if( fwrite( p_block->p_buffer, p_block->i_buffer, 1, file ) != 1 )
 368             err = errno;
 369         block_Release( p_block );
 370     }
 371
 372     if( fclose( file ) && !err )
 373         err = errno;
 374
 375     if( err )
 376     {
 377        errno = err;
 378        msg_Err( p_image->p_parent, "%s: %m", psz_url );
 379     }
 380
 381     return err ? VLC_EGENERIC : VLC_SUCCESS;
 382 }
 383
 384 /**
 385  * Convert an image to a different format
 386  *
 387  */
 388
 389 static picture_t *ImageConvert( image_handler_t *p_image, picture_t *p_pic,
 390                                 video_format_t *p_fmt_in,
 391                                 video_format_t *p_fmt_out )
 392 {
 393     picture_t *p_pif;
 394
 395     if( !p_fmt_out->i_width && !p_fmt_out->i_height &&
 396         p_fmt_out->i_sar_num && p_fmt_out->i_sar_den &&
 397         p_fmt_out->i_sar_num * p_fmt_in->i_sar_den !=
 398         p_fmt_out->i_sar_den * p_fmt_in->i_sar_num )
 399     {
 400         p_fmt_out->i_width =
 401             p_fmt_in->i_sar_num * (int64_t)p_fmt_out->i_sar_den *
 402             p_fmt_in->i_width / p_fmt_in->i_sar_den / p_fmt_out->i_sar_num;
 403         p_fmt_out->i_visible_width =
 404             p_fmt_in->i_sar_num * (int64_t)p_fmt_out->i_sar_den *
 405             p_fmt_in->i_visible_width / p_fmt_in->i_sar_den /
 406             p_fmt_out->i_sar_num;
 407     }
 408
 409     if( !p_fmt_out->i_chroma ) p_fmt_out->i_chroma = p_fmt_in->i_chroma;
 410     if( !p_fmt_out->i_width )
 411         p_fmt_out->i_width = p_fmt_out->i_visible_width = p_fmt_in->i_width;
 412     if( !p_fmt_out->i_height )
 413         p_fmt_out->i_height = p_fmt_out->i_visible_height = p_fmt_in->i_height;
 414     if( !p_fmt_out->i_sar_num ) p_fmt_out->i_sar_num = p_fmt_in->i_sar_num;
 415     if( !p_fmt_out->i_sar_den ) p_fmt_out->i_sar_den = p_fmt_in->i_sar_den;
 416     if( !p_fmt_out->i_aspect ) p_fmt_out->i_aspect = p_fmt_in->i_aspect;
 417
 418     if( p_image->p_filter )
 419     if( p_image->p_filter->fmt_in.video.i_chroma != p_fmt_in->i_chroma ||
 420         p_image->p_filter->fmt_out.video.i_chroma != p_fmt_out->i_chroma )
 421     {
 422         /* We need to restart a new filter */
 423         DeleteFilter( p_image->p_filter );
 424         p_image->p_filter = NULL;
 425     }
 426
 427     /* Start a filter */
 428     if( !p_image->p_filter )
 429     {
 430         es_format_t fmt_in;
 431         es_format_Init( &fmt_in, VIDEO_ES, p_fmt_in->i_chroma );
 432         fmt_in.video = *p_fmt_in;
 433
 434         p_image->p_filter =
 435             CreateFilter( p_image->p_parent, &fmt_in, p_fmt_out, NULL );
 436
 437         if( !p_image->p_filter )
 438         {
 439             return NULL;
 440         }
 441     }
 442     else
 443     {
 444         /* Filters should handle on-the-fly size changes */
 445         p_image->p_filter->fmt_in.video = *p_fmt_in;
 446         p_image->p_filter->fmt_out.video = *p_fmt_out;
 447     }
 448
 449     picture_Yield( p_pic );
 450
 451     p_pif = p_image->p_filter->pf_video_filter( p_image->p_filter, p_pic );
 452
 453     if( p_fmt_in->i_chroma == p_fmt_out->i_chroma &&
 454         p_fmt_in->i_width == p_fmt_out->i_width &&
 455         p_fmt_in->i_height == p_fmt_out->i_height )
 456     {
 457         /* Duplicate image */
 458         picture_Release( p_pif ); /* XXX: Better fix must be possible */
 459         p_pif = p_image->p_filter->pf_vout_buffer_new( p_image->p_filter );
 460         if( p_pif ) vout_CopyPicture( p_image->p_parent, p_pif, p_pic );
 461     }
 462
 463     return p_pif;
 464 }
 465
 466 /**
 467  * Filter an image with a psz_module filter
 468  *
 469  */
 470
 471 static picture_t *ImageFilter( image_handler_t *p_image, picture_t *p_pic,
 472                                video_format_t *p_fmt, const char *psz_module )
 473 {
 474     /* Start a filter */
 475     if( !p_image->p_filter )
 476     {
 477         es_format_t fmt;
 478         es_format_Init( &fmt, VIDEO_ES, p_fmt->i_chroma );
 479         fmt.video = *p_fmt;
 480
 481         p_image->p_filter =
 482             CreateFilter( p_image->p_parent, &fmt, &fmt.video, psz_module );
 483
 484         if( !p_image->p_filter )
 485         {
 486             return NULL;
 487         }
 488     }
 489     else
 490     {
 491         /* Filters should handle on-the-fly size changes */
 492         p_image->p_filter->fmt_in.video = *p_fmt;
 493         p_image->p_filter->fmt_out.video = *p_fmt;
 494     }
 495
 496     picture_Yield( p_pic );
 497
 498     return p_image->p_filter->pf_video_filter( p_image->p_filter, p_pic );
 499 }
 500
 501 /**
 502  * Misc functions
 503  *
 504  */
 505 static struct
 506 {
 507     vlc_fourcc_t i_codec;
 508     const char *psz_ext;
 509
 510 } ext_table[] =
 511 {
 512     { VLC_FOURCC('j','p','e','g'), "jpeg" },
 513     { VLC_FOURCC('j','p','e','g'), "jpg"  },
 514     { VLC_FOURCC('l','j','p','g'), "ljpg" },
 515     { VLC_FOURCC('p','n','g',' '), "png" },
 516     { VLC_FOURCC('p','g','m',' '), "pgm" },
 517     { VLC_FOURCC('p','g','m','y'), "pgmyuv" },
 518     { VLC_FOURCC('p','b','m',' '), "pbm" },
 519     { VLC_FOURCC('p','a','m',' '), "pam" },
 520     { VLC_FOURCC('t','g','a',' '), "tga" },
 521     { VLC_FOURCC('b','m','p',' '), "bmp" },
 522     { VLC_FOURCC('p','n','m',' '), "pnm" },
 523     { VLC_FOURCC('x','p','m',' '), "xpm" },
 524     { VLC_FOURCC('x','c','f',' '), "xcf" },
 525     { VLC_FOURCC('p','c','x',' '), "pcx" },
 526     { VLC_FOURCC('g','i','f',' '), "gif" },
 527     { VLC_FOURCC('t','i','f','f'), "tif" },
 528     { VLC_FOURCC('t','i','f','f'), "tiff" },
 529     { VLC_FOURCC('l','b','m',' '), "lbm" },
 530     { 0, NULL }
 531 };
 532
 533 static vlc_fourcc_t Ext2Fourcc( const char *psz_name )
 534 {
 535     int i;
 536
 537     psz_name = strrchr( psz_name, '.' );
 538     if( !psz_name ) return 0;
 539     psz_name++;
 540
 541     for( i = 0; ext_table[i].i_codec; i++ )
 542     {
 543         int j;
 544         for( j = 0; toupper(ext_table[i].psz_ext[j]) == toupper(psz_name[j]);
 545              j++ )
 546         {
 547             if( !ext_table[i].psz_ext[j] && !psz_name[j] )
 548                 return ext_table[i].i_codec;
 549         }
 550     }
 551
 552     return 0;
 553 }
 554
 555 /*
 556 static const char *Fourcc2Ext( vlc_fourcc_t i_codec )
 557 {
 558     int i;
 559
 560     for( i = 0; ext_table[i].i_codec != 0; i++ )
 561     {
 562         if( ext_table[i].i_codec == i_codec ) return ext_table[i].psz_ext;
 563     }
 564
 565     return NULL;
 566 }
 567 */
 568
 569 static void video_release_buffer( picture_t *p_pic )
 570 {
 571     picture_Release( p_pic );
 572 }
 573
 574 static picture_t *video_new_buffer( decoder_t *p_dec )
 575 {
 576     p_dec->fmt_out.video.i_chroma = p_dec->fmt_out.i_codec;
 577     return picture_New( 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
 583 static void video_del_buffer( decoder_t *p_dec, picture_t *p_pic )
 584 {
 585     if( p_pic->i_refcount != 1 )
 586         msg_Err( p_dec, "invalid picture reference count" );
 587
 588     p_pic->i_refcount = 0;
 589     picture_Delete( p_pic );
 590 }
 591
 592 static void video_link_picture( decoder_t *p_dec, picture_t *p_pic )
 593 {
 594     (void)p_dec;
 595     picture_Yield( p_pic );
 596 }
 597
 598 static void video_unlink_picture( decoder_t *p_dec, picture_t *p_pic )
 599 {
 600     (void)p_dec;
 601     picture_Release( p_pic );
 602 }
 603
 604 static decoder_t *CreateDecoder( vlc_object_t *p_this, video_format_t *fmt )
 605 {
 606     decoder_t *p_dec;
 607
 608     p_dec = vlc_object_create( p_this, VLC_OBJECT_DECODER );
 609     if( p_dec == NULL )
 610         return NULL;
 611
 612     p_dec->p_module = NULL;
 613     es_format_Init( &p_dec->fmt_in, VIDEO_ES, fmt->i_chroma );
 614     es_format_Init( &p_dec->fmt_out, VIDEO_ES, 0 );
 615     p_dec->fmt_in.video = *fmt;
 616     p_dec->b_pace_control = true;
 617
 618     p_dec->pf_vout_buffer_new = video_new_buffer;
 619     p_dec->pf_vout_buffer_del = video_del_buffer;
 620     p_dec->pf_picture_link    = video_link_picture;
 621     p_dec->pf_picture_unlink  = video_unlink_picture;
 622
 623     vlc_object_attach( p_dec, p_this );
 624
 625     /* Find a suitable decoder module */
 626     p_dec->p_module = module_Need( p_dec, "decoder", "$codec", 0 );
 627     if( !p_dec->p_module )
 628     {
 629         msg_Err( p_dec, "no suitable decoder module for fourcc `%4.4s'.\n"
 630                  "VLC probably does not support this image format.",
 631                  (char*)&p_dec->fmt_in.i_codec );
 632
 633         DeleteDecoder( p_dec );
 634         return NULL;
 635     }
 636
 637     return p_dec;
 638 }
 639
 640 static void DeleteDecoder( decoder_t * p_dec )
 641 {
 642     vlc_object_detach( p_dec );
 643
 644     if( p_dec->p_module ) module_Unneed( p_dec, p_dec->p_module );
 645
 646     es_format_Clean( &p_dec->fmt_in );
 647     es_format_Clean( &p_dec->fmt_out );
 648
 649     vlc_object_release( p_dec );
 650     p_dec = NULL;
 651 }
 652
 653 static encoder_t *CreateEncoder( vlc_object_t *p_this, video_format_t *fmt_in,
 654                                  video_format_t *fmt_out )
 655 {
 656     encoder_t *p_enc;
 657
 658     p_enc = vlc_object_create( p_this, VLC_OBJECT_ENCODER );
 659     if( p_enc == NULL )
 660         return NULL;
 661
 662     p_enc->p_module = NULL;
 663     es_format_Init( &p_enc->fmt_in, VIDEO_ES, fmt_in->i_chroma );
 664     p_enc->fmt_in.video = *fmt_in;
 665     if( fmt_out->i_width > 0 && fmt_out->i_height > 0 )
 666     {
 667         p_enc->fmt_in.video.i_width = fmt_out->i_width;
 668         p_enc->fmt_in.video.i_height = fmt_out->i_height;
 669
 670         if( fmt_out->i_visible_width > 0 &&
 671             fmt_out->i_visible_height > 0 )
 672         {
 673             p_enc->fmt_in.video.i_visible_width = fmt_out->i_visible_width;
 674             p_enc->fmt_in.video.i_visible_height = fmt_out->i_visible_height;
 675         }
 676         else
 677         {
 678             p_enc->fmt_in.video.i_visible_width = fmt_out->i_width;
 679             p_enc->fmt_in.video.i_visible_height = fmt_out->i_height;
 680         }
 681     }
 682     else if( fmt_out->i_sar_num && fmt_out->i_sar_den &&
 683              fmt_out->i_sar_num * fmt_in->i_sar_den !=
 684              fmt_out->i_sar_den * fmt_in->i_sar_num )
 685     {
 686         p_enc->fmt_in.video.i_width =
 687             fmt_in->i_sar_num * (int64_t)fmt_out->i_sar_den * fmt_in->i_width /
 688             fmt_in->i_sar_den / fmt_out->i_sar_num;
 689         p_enc->fmt_in.video.i_visible_width =
 690             fmt_in->i_sar_num * (int64_t)fmt_out->i_sar_den *
 691             fmt_in->i_visible_width / fmt_in->i_sar_den / fmt_out->i_sar_num;
 692     }
 693
 694     p_enc->fmt_in.video.i_frame_rate = 25;
 695     p_enc->fmt_in.video.i_frame_rate_base = 1;
 696
 697     es_format_Init( &p_enc->fmt_out, VIDEO_ES, fmt_out->i_chroma );
 698     p_enc->fmt_out.video = *fmt_out;
 699     p_enc->fmt_out.video.i_width = p_enc->fmt_in.video.i_width;
 700     p_enc->fmt_out.video.i_height = p_enc->fmt_in.video.i_height;
 701
 702     vlc_object_attach( p_enc, p_this );
 703
 704     /* Find a suitable decoder module */
 705     p_enc->p_module = module_Need( p_enc, "encoder", 0, 0 );
 706     if( !p_enc->p_module )
 707     {
 708         msg_Err( p_enc, "no suitable encoder module for fourcc `%4.4s'.\n"
 709                  "VLC probably does not support this image format.",
 710                  (char*)&p_enc->fmt_out.i_codec );
 711
 712         DeleteEncoder( p_enc );
 713         return NULL;
 714     }
 715     p_enc->fmt_in.video.i_chroma = p_enc->fmt_in.i_codec;
 716
 717     return p_enc;
 718 }
 719
 720 static void DeleteEncoder( encoder_t * p_enc )
 721 {
 722     vlc_object_detach( p_enc );
 723
 724     if( p_enc->p_module ) module_Unneed( p_enc, p_enc->p_module );
 725
 726     es_format_Clean( &p_enc->fmt_in );
 727     es_format_Clean( &p_enc->fmt_out );
 728
 729     vlc_object_release( p_enc );
 730     p_enc = NULL;
 731 }
 732
 733 static filter_t *CreateFilter( vlc_object_t *p_this, es_format_t *p_fmt_in,
 734                                video_format_t *p_fmt_out,
 735                                const char *psz_module )
 736 {
 737     static const char typename[] = "filter";
 738     filter_t *p_filter;
 739
 740     p_filter = vlc_custom_create( p_this, sizeof(filter_t),
 741                                   VLC_OBJECT_GENERIC, typename );
 742     vlc_object_attach( p_filter, p_this );
 743
 744     p_filter->pf_vout_buffer_new =
 745         (picture_t *(*)(filter_t *))video_new_buffer;
 746     p_filter->pf_vout_buffer_del =
 747         (void (*)(filter_t *, picture_t *))video_del_buffer;
 748
 749     p_filter->fmt_in = *p_fmt_in;
 750     p_filter->fmt_out = *p_fmt_in;
 751     p_filter->fmt_out.i_codec = p_fmt_out->i_chroma;
 752     p_filter->fmt_out.video = *p_fmt_out;
 753     p_filter->p_module = module_Need( p_filter, "video filter2",
 754                                       psz_module, 0 );
 755
 756     if( !p_filter->p_module )
 757     {
 758         msg_Dbg( p_filter, "no video filter found" );
 759         DeleteFilter( p_filter );
 760         return NULL;
 761     }
 762
 763     return p_filter;
 764 }
 765
 766 static void DeleteFilter( filter_t * p_filter )
 767 {
 768     vlc_object_detach( p_filter );
 769
 770     if( p_filter->p_module ) module_Unneed( p_filter, p_filter->p_module );
 771
 772     es_format_Clean( &p_filter->fmt_in );
 773     es_format_Clean( &p_filter->fmt_out );
 774
 775     vlc_object_release( p_filter );
 776 }