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 VideoLAN
   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., 59 Temple Place - Suite 330, Boston, MA  02111, 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/decoder.h>
  35 #include <vlc_filter.h>
  36 #include <vlc_image.h>
  37
  38 static picture_t *ImageRead( image_handler_t *, block_t *,
  39                              video_format_t *, video_format_t * );
  40 static picture_t *ImageReadUrl( image_handler_t *, const char *,
  41                                 video_format_t *, video_format_t * );
  42 static block_t *ImageWrite( image_handler_t *, picture_t *,
  43                             video_format_t *, video_format_t * );
  44 static int ImageWriteUrl( image_handler_t *, picture_t *,
  45                           video_format_t *, video_format_t *, const char * );
  46
  47 static picture_t *ImageConvert( image_handler_t *, picture_t *,
  48                                 video_format_t *, video_format_t * );
  49
  50 static decoder_t *CreateDecoder( vlc_object_t *, video_format_t * );
  51 static void DeleteDecoder( decoder_t * );
  52 static encoder_t *CreateEncoder( vlc_object_t *, video_format_t *,
  53                                  video_format_t * );
  54 static void DeleteEncoder( encoder_t * );
  55 static filter_t *CreateFilter( vlc_object_t *, es_format_t *,
  56                                video_format_t * );
  57 static void DeleteFilter( filter_t * );
  58
  59 static vlc_fourcc_t Ext2Fourcc( const char * );
  60 static const char *Fourcc2Ext( vlc_fourcc_t );
  61
  62 /**
  63  * Create an image_handler_t instance
  64  *
  65  */
  66 image_handler_t *__image_HandlerCreate( vlc_object_t *p_this )
  67 {
  68     image_handler_t *p_image = malloc( sizeof(image_handler_t) );
  69
  70     memset( p_image, 0, sizeof(image_handler_t) );
  71     p_image->p_parent = p_this;
  72
  73     p_image->pf_read = ImageRead;
  74     p_image->pf_read_url = ImageReadUrl;
  75     p_image->pf_write = ImageWrite;
  76     p_image->pf_write_url = ImageWriteUrl;
  77     p_image->pf_convert = ImageConvert;
  78
  79     return p_image;
  80 }
  81
  82 /**
  83  * Delete the image_handler_t instance
  84  *
  85  */
  86 void image_HandlerDelete( image_handler_t *p_image )
  87 {
  88     if( !p_image ) return;
  89
  90     if( p_image->p_dec ) DeleteDecoder( p_image->p_dec );
  91     if( p_image->p_enc ) DeleteEncoder( p_image->p_enc );
  92     if( p_image->p_filter ) DeleteFilter( p_image->p_filter );
  93
  94     free( p_image );
  95 }
  96
  97 /**
  98  * Read an image
  99  *
 100  */
 101
 102 static picture_t *ImageRead( image_handler_t *p_image, block_t *p_block,
 103                              video_format_t *p_fmt_in,
 104                              video_format_t *p_fmt_out )
 105 {
 106     picture_t *p_pic;
 107
 108     /* Check if we can reuse the current decoder */
 109     if( p_image->p_dec &&
 110         p_image->p_dec->fmt_in.i_codec != p_fmt_in->i_chroma )
 111     {
 112         DeleteDecoder( p_image->p_dec );
 113         p_image->p_dec = 0;
 114     }
 115
 116     /* Start a decoder */
 117     if( !p_image->p_dec )
 118     {
 119         p_image->p_dec = CreateDecoder( p_image->p_parent, p_fmt_in );
 120         if( !p_image->p_dec ) return NULL;
 121     }
 122
 123     p_block->i_pts = p_block->i_dts = mdate();
 124     p_pic = p_image->p_dec->pf_decode_video( p_image->p_dec, &p_block );
 125     p_image->p_dec->pf_decode_video( p_image->p_dec, &p_block );
 126
 127     if( !p_pic )
 128     {
 129         msg_Dbg( p_image->p_parent, "no image decoded" );
 130         return 0;
 131     }
 132
 133     if( !p_fmt_out->i_chroma )
 134         p_fmt_out->i_chroma = p_image->p_dec->fmt_out.video.i_chroma;
 135     if( !p_fmt_out->i_width )
 136         p_fmt_out->i_width = p_image->p_dec->fmt_out.video.i_width;
 137     if( !p_fmt_out->i_height )
 138         p_fmt_out->i_height = p_image->p_dec->fmt_out.video.i_height;
 139
 140     /* Check if we need chroma conversion or resizing */
 141     if( p_image->p_dec->fmt_out.video.i_chroma != p_fmt_out->i_chroma ||
 142         p_image->p_dec->fmt_out.video.i_width != p_fmt_out->i_width ||
 143         p_image->p_dec->fmt_out.video.i_height != p_fmt_out->i_height )
 144     {
 145         if( p_image->p_filter )
 146         if( p_image->p_filter->fmt_in.video.i_chroma !=
 147             p_image->p_dec->fmt_out.video.i_chroma ||
 148             p_image->p_filter->fmt_out.video.i_chroma != p_fmt_out->i_chroma )
 149         {
 150             /* We need to restart a new filter */
 151             DeleteFilter( p_image->p_filter );
 152             p_image->p_filter = 0;
 153         }
 154
 155         /* Start a filter */
 156         if( !p_image->p_filter )
 157         {
 158             p_image->p_filter =
 159                 CreateFilter( p_image->p_parent, &p_image->p_dec->fmt_out,
 160                               p_fmt_out );
 161
 162             if( !p_image->p_filter )
 163             {
 164                 p_pic->pf_release( p_pic );
 165                 return NULL;
 166             }
 167         }
 168         else
 169         {
 170             /* Filters should handle on-the-fly size changes */
 171             p_image->p_filter->fmt_in = p_image->p_dec->fmt_out;
 172             p_image->p_filter->fmt_out = p_image->p_dec->fmt_out;
 173             p_image->p_filter->fmt_out.i_codec = p_fmt_out->i_chroma;
 174             p_image->p_filter->fmt_out.video = *p_fmt_out;
 175         }
 176
 177         p_pic = p_image->p_filter->pf_video_filter( p_image->p_filter, p_pic );
 178         *p_fmt_out = p_image->p_filter->fmt_out.video;
 179     }
 180     else *p_fmt_out = p_image->p_dec->fmt_out.video;
 181
 182     return p_pic;
 183 }
 184
 185 static picture_t *ImageReadUrl( image_handler_t *p_image, const char *psz_url,
 186                                 video_format_t *p_fmt_in,
 187                                 video_format_t *p_fmt_out )
 188 {
 189     block_t *p_block;
 190     picture_t *p_pic;
 191     FILE *file;
 192     int i_size;
 193
 194     file = fopen( psz_url, "rb" );
 195     if( !file )
 196     {
 197         msg_Dbg( p_image->p_parent, "could not open file %s for reading",
 198                  psz_url );
 199         return NULL;
 200     }
 201
 202     fseek( file, 0, SEEK_END );
 203     i_size = ftell( file );
 204     fseek( file, 0, SEEK_SET );
 205
 206     p_block = block_New( p_image->p_parent, i_size );
 207     fread( p_block->p_buffer, sizeof(char), i_size, file );
 208     fclose( file );
 209
 210     if( !p_fmt_in->i_chroma )
 211     {
 212         /* Try to guess format from file name */
 213         p_fmt_in->i_chroma = Ext2Fourcc( psz_url );
 214     }
 215
 216     p_pic = ImageRead( p_image, p_block, p_fmt_in, p_fmt_out );
 217
 218     return p_pic;
 219 }
 220
 221 /**
 222  * Write an image
 223  *
 224  */
 225
 226 void PicRelease( picture_t *p_pic ){};
 227
 228 static block_t *ImageWrite( image_handler_t *p_image, picture_t *p_pic,
 229                             video_format_t *p_fmt_in,
 230                             video_format_t *p_fmt_out )
 231 {
 232     block_t *p_block;
 233     void (*pf_release)( picture_t * );
 234
 235     /* Check if we can reuse the current encoder */
 236     if( p_image->p_enc &&
 237         ( p_image->p_enc->fmt_out.i_codec != p_fmt_out->i_chroma ||
 238           p_image->p_enc->fmt_out.video.i_width != p_fmt_out->i_width ||
 239           p_image->p_enc->fmt_out.video.i_height != p_fmt_out->i_height ) )
 240     {
 241         DeleteEncoder( p_image->p_enc );
 242         p_image->p_enc = 0;
 243     }
 244
 245     /* Start an encoder */
 246     if( !p_image->p_enc )
 247     {
 248         p_image->p_enc = CreateEncoder( p_image->p_parent,
 249                                         p_fmt_in, p_fmt_out );
 250         if( !p_image->p_enc ) return NULL;
 251     }
 252
 253     /* Check if we need chroma conversion or resizing */
 254     if( p_image->p_enc->fmt_in.video.i_chroma != p_fmt_in->i_chroma ||
 255         p_image->p_enc->fmt_in.video.i_width != p_fmt_in->i_width ||
 256         p_image->p_enc->fmt_in.video.i_height != p_fmt_in->i_height )
 257     {
 258         picture_t *p_pif;
 259
 260         if( p_image->p_filter )
 261         if( p_image->p_filter->fmt_in.video.i_chroma != p_fmt_in->i_chroma ||
 262             p_image->p_filter->fmt_out.video.i_chroma !=
 263             p_image->p_enc->fmt_in.video.i_chroma )
 264         {
 265             /* We need to restart a new filter */
 266             DeleteFilter( p_image->p_filter );
 267             p_image->p_filter = 0;
 268         }
 269
 270         /* Start a filter */
 271         if( !p_image->p_filter )
 272         {
 273             es_format_t fmt_in;
 274             es_format_Init( &fmt_in, VIDEO_ES, p_fmt_in->i_chroma );
 275             fmt_in.video = *p_fmt_in;
 276
 277             p_image->p_filter =
 278                 CreateFilter( p_image->p_parent, &fmt_in,
 279                               &p_image->p_enc->fmt_in.video );
 280
 281             if( !p_image->p_filter )
 282             {
 283                 return NULL;
 284             }
 285         }
 286         else
 287         {
 288             /* Filters should handle on-the-fly size changes */
 289             p_image->p_filter->fmt_in.i_codec = p_fmt_in->i_chroma;
 290             p_image->p_filter->fmt_out.video = *p_fmt_in;
 291             p_image->p_filter->fmt_out.i_codec =p_image->p_enc->fmt_in.i_codec;
 292             p_image->p_filter->fmt_out.video = p_image->p_enc->fmt_in.video;
 293         }
 294
 295         pf_release = p_pic->pf_release;
 296         p_pic->pf_release = PicRelease; /* Small hack */
 297         p_pif = p_image->p_filter->pf_video_filter( p_image->p_filter, p_pic );
 298         p_pic->pf_release = pf_release;
 299         p_pic = p_pif;
 300     }
 301
 302     p_block = p_image->p_enc->pf_encode_video( p_image->p_enc, p_pic );
 303
 304     if( !p_block )
 305     {
 306         msg_Dbg( p_image->p_parent, "no image encoded" );
 307         return 0;
 308     }
 309
 310     return p_block;
 311 }
 312
 313 static int ImageWriteUrl( image_handler_t *p_image, picture_t *p_pic,
 314                           video_format_t *p_fmt_in, video_format_t *p_fmt_out,
 315                           const char *psz_url )
 316 {
 317     block_t *p_block;
 318     FILE *file;
 319
 320     if( !p_fmt_out->i_chroma )
 321     {
 322         /* Try to guess format from file name */
 323         p_fmt_out->i_chroma = Ext2Fourcc( psz_url );
 324     }
 325
 326     file = fopen( psz_url, "wb" );
 327     if( !file )
 328     {
 329         msg_Dbg( p_image->p_parent, "could not open file %s for writing",
 330                  psz_url );
 331         return VLC_EGENERIC;
 332     }
 333
 334     p_block = ImageWrite( p_image, p_pic, p_fmt_in, p_fmt_out );
 335
 336     if( p_block )
 337     {
 338         fwrite( p_block->p_buffer, sizeof(char), p_block->i_buffer, file );
 339         block_Release( p_block );
 340     }
 341
 342     fclose( file );
 343
 344     return p_block ? VLC_SUCCESS : VLC_EGENERIC;
 345 }
 346
 347 /**
 348  * Convert an image to a different format
 349  *
 350  */
 351
 352 static picture_t *ImageConvert( image_handler_t *p_image, picture_t *p_pic,
 353                                 video_format_t *p_fmt_in,
 354                                 video_format_t *p_fmt_out )
 355 {
 356     void (*pf_release)( picture_t * );
 357     picture_t *p_pif;
 358
 359     if( !p_fmt_out->i_chroma ) p_fmt_out->i_chroma = p_fmt_in->i_chroma;
 360     if( !p_fmt_out->i_width ) p_fmt_out->i_width = p_fmt_in->i_width;
 361     if( !p_fmt_out->i_height ) p_fmt_out->i_height = p_fmt_in->i_height;
 362
 363     if( p_image->p_filter )
 364     if( p_image->p_filter->fmt_in.video.i_chroma != p_fmt_in->i_chroma ||
 365         p_image->p_filter->fmt_out.video.i_chroma != p_fmt_out->i_chroma )
 366     {
 367         /* We need to restart a new filter */
 368         DeleteFilter( p_image->p_filter );
 369         p_image->p_filter = 0;
 370     }
 371
 372     /* Start a filter */
 373     if( !p_image->p_filter )
 374     {
 375         es_format_t fmt_in;
 376         es_format_Init( &fmt_in, VIDEO_ES, p_fmt_in->i_chroma );
 377         fmt_in.video = *p_fmt_in;
 378
 379         p_image->p_filter =
 380             CreateFilter( p_image->p_parent, &fmt_in, p_fmt_out );
 381
 382         if( !p_image->p_filter )
 383         {
 384             return NULL;
 385         }
 386     }
 387     else
 388     {
 389         /* Filters should handle on-the-fly size changes */
 390         p_image->p_filter->fmt_in.video = *p_fmt_in;
 391         p_image->p_filter->fmt_out.video = *p_fmt_out;
 392     }
 393
 394     pf_release = p_pic->pf_release;
 395     p_pic->pf_release = PicRelease; /* Small hack */
 396     p_pif = p_image->p_filter->pf_video_filter( p_image->p_filter, p_pic );
 397     p_pic->pf_release = pf_release;
 398
 399     if( p_fmt_in->i_chroma == p_fmt_out->i_chroma &&
 400         p_fmt_in->i_width == p_fmt_out->i_width &&
 401         p_fmt_in->i_height == p_fmt_out->i_height )
 402     {
 403         /* Duplicate image */
 404         p_pif = p_image->p_filter->pf_vout_buffer_new( p_image->p_filter );
 405         if( p_pif ) vout_CopyPicture( p_image->p_parent, p_pif, p_pic );
 406     }
 407
 408     return p_pif;
 409 }
 410
 411 /**
 412  * Misc functions
 413  *
 414  */
 415 static struct
 416 {
 417     vlc_fourcc_t i_codec;
 418     char *psz_ext;
 419
 420 } ext_table[] =
 421 {
 422     { VLC_FOURCC('j','p','e','g'), "jpeg" },
 423     { VLC_FOURCC('j','p','e','g'), "jpg"  },
 424     { VLC_FOURCC('l','j','p','g'), "ljpg" },
 425     { VLC_FOURCC('p','n','g',' '), "png" },
 426     { VLC_FOURCC('p','g','m',' '), "pgm" },
 427     { VLC_FOURCC('p','g','m','y'), "pgmyuv" },
 428     { VLC_FOURCC('p','b','m',' '), "pbm" },
 429     { VLC_FOURCC('p','a','m',' '), "pam" },
 430     { 0, NULL }
 431 };
 432
 433 static vlc_fourcc_t Ext2Fourcc( const char *psz_name )
 434 {
 435     int i;
 436
 437     psz_name = strrchr( psz_name, '.' );
 438     if( !psz_name ) return 0;
 439     psz_name++;
 440
 441     for( i = 0; ext_table[i].i_codec; i++ )
 442     {
 443         int j;
 444         for( j = 0; toupper(ext_table[i].psz_ext[j]) == toupper(psz_name[j]);
 445              j++ )
 446         {
 447             if( !ext_table[i].psz_ext[j] && !psz_name[j] )
 448                 return ext_table[i].i_codec;
 449         }
 450     }
 451
 452     return 0;
 453 }
 454
 455 static const char *Fourcc2Ext( vlc_fourcc_t i_codec )
 456 {
 457     int i;
 458
 459     for( i = 0; ext_table[i].i_codec != 0; i++ )
 460     {
 461         if( ext_table[i].i_codec == i_codec ) return ext_table[i].psz_ext;
 462     }
 463
 464     return NULL;
 465 }
 466
 467 static void video_release_buffer( picture_t *p_pic )
 468 {
 469     if( p_pic && p_pic->p_data_orig ) free( p_pic->p_data_orig );
 470     if( p_pic && p_pic->p_sys ) free( p_pic->p_sys );
 471     if( p_pic ) free( p_pic );
 472 }
 473
 474 static picture_t *video_new_buffer( decoder_t *p_dec )
 475 {
 476     picture_t *p_pic = malloc( sizeof(picture_t) );
 477
 478     p_dec->fmt_out.video.i_chroma = p_dec->fmt_out.i_codec;
 479     vout_AllocatePicture( VLC_OBJECT(p_dec), p_pic,
 480                           p_dec->fmt_out.video.i_chroma,
 481                           p_dec->fmt_out.video.i_width,
 482                           p_dec->fmt_out.video.i_height,
 483                           p_dec->fmt_out.video.i_aspect );
 484
 485     if( !p_pic->i_planes )
 486     {
 487         free( p_pic );
 488         return 0;
 489     }
 490
 491     p_pic->pf_release = video_release_buffer;
 492     p_pic->i_status = RESERVED_PICTURE;
 493     p_pic->p_sys = NULL;
 494
 495     return p_pic;
 496 }
 497
 498 static void video_del_buffer( decoder_t *p_dec, picture_t *p_pic )
 499 {
 500     if( p_pic && p_pic->p_data_orig ) free( p_pic->p_data_orig );
 501     if( p_pic && p_pic->p_sys ) free( p_pic->p_sys );
 502     if( p_pic ) free( p_pic );
 503 }
 504
 505 static void video_link_picture( decoder_t *p_dec, picture_t *p_pic )
 506 {
 507 }
 508
 509 static void video_unlink_picture( decoder_t *p_dec, picture_t *p_pic )
 510 {
 511 }
 512
 513 static decoder_t *CreateDecoder( vlc_object_t *p_this, video_format_t *fmt )
 514 {
 515     decoder_t *p_dec;
 516
 517     p_dec = vlc_object_create( p_this, VLC_OBJECT_DECODER );
 518     if( p_dec == NULL )
 519     {
 520         msg_Err( p_this, "out of memory" );
 521         return NULL;
 522     }
 523
 524     p_dec->p_module = NULL;
 525     es_format_Init( &p_dec->fmt_in, VIDEO_ES, fmt->i_chroma );
 526     es_format_Init( &p_dec->fmt_out, VIDEO_ES, 0 );
 527     p_dec->fmt_in.video = *fmt;
 528     p_dec->b_pace_control = VLC_TRUE;
 529
 530     p_dec->pf_vout_buffer_new = video_new_buffer;
 531     p_dec->pf_vout_buffer_del = video_del_buffer;
 532     p_dec->pf_picture_link    = video_link_picture;
 533     p_dec->pf_picture_unlink  = video_unlink_picture;
 534
 535     vlc_object_attach( p_dec, p_this );
 536
 537     /* Find a suitable decoder module */
 538     p_dec->p_module = module_Need( p_dec, "decoder", "$codec", 0 );
 539     if( !p_dec->p_module )
 540     {
 541         msg_Err( p_dec, "no suitable decoder module for fourcc `%4.4s'.\n"
 542                  "VLC probably does not support this image format.",
 543                  (char*)&p_dec->fmt_in.i_codec );
 544
 545         DeleteDecoder( p_dec );
 546         return NULL;
 547     }
 548
 549     return p_dec;
 550 }
 551
 552 static void DeleteDecoder( decoder_t * p_dec )
 553 {
 554     vlc_object_detach( p_dec );
 555
 556     if( p_dec->p_module ) module_Unneed( p_dec, p_dec->p_module );
 557
 558     es_format_Clean( &p_dec->fmt_in );
 559     es_format_Clean( &p_dec->fmt_out );
 560
 561     vlc_object_destroy( p_dec );
 562 }
 563
 564 static encoder_t *CreateEncoder( vlc_object_t *p_this, video_format_t *fmt_in,
 565                                  video_format_t *fmt_out )
 566 {
 567     encoder_t *p_enc;
 568
 569     p_enc = vlc_object_create( p_this, VLC_OBJECT_ENCODER );
 570     if( p_enc == NULL )
 571     {
 572         msg_Err( p_this, "out of memory" );
 573         return NULL;
 574     }
 575
 576     p_enc->p_module = NULL;
 577     es_format_Init( &p_enc->fmt_in, VIDEO_ES, fmt_in->i_chroma );
 578     p_enc->fmt_in.video = *fmt_in;
 579     if( fmt_out->i_width > 0 && fmt_out->i_height > 0 )
 580     {
 581         p_enc->fmt_in.video.i_width = fmt_out->i_width;
 582         p_enc->fmt_in.video.i_height = fmt_out->i_height;
 583     }
 584     p_enc->fmt_in.video.i_frame_rate = 25;
 585     p_enc->fmt_in.video.i_frame_rate_base = 1;
 586
 587     es_format_Init( &p_enc->fmt_out, VIDEO_ES, fmt_out->i_chroma );
 588     p_enc->fmt_out.video = *fmt_out;
 589     p_enc->fmt_out.video.i_width = p_enc->fmt_in.video.i_width;
 590     p_enc->fmt_out.video.i_height = p_enc->fmt_in.video.i_height;
 591
 592     vlc_object_attach( p_enc, p_this );
 593
 594     /* Find a suitable decoder module */
 595     p_enc->p_module = module_Need( p_enc, "encoder", 0, 0 );
 596     if( !p_enc->p_module )
 597     {
 598         msg_Err( p_enc, "no suitable encoder module for fourcc `%4.4s'.\n"
 599                  "VLC probably does not support this image format.",
 600                  (char*)&p_enc->fmt_out.i_codec );
 601
 602         DeleteEncoder( p_enc );
 603         return NULL;
 604     }
 605     p_enc->fmt_in.video.i_chroma = p_enc->fmt_in.i_codec;
 606
 607     return p_enc;
 608 }
 609
 610 static void DeleteEncoder( encoder_t * p_enc )
 611 {
 612     vlc_object_detach( p_enc );
 613
 614     if( p_enc->p_module ) module_Unneed( p_enc, p_enc->p_module );
 615
 616     es_format_Clean( &p_enc->fmt_in );
 617     es_format_Clean( &p_enc->fmt_out );
 618
 619     vlc_object_destroy( p_enc );
 620 }
 621
 622 static filter_t *CreateFilter( vlc_object_t *p_this, es_format_t *p_fmt_in,
 623                                video_format_t *p_fmt_out )
 624 {
 625     filter_t *p_filter;
 626
 627     p_filter = vlc_object_create( p_this, VLC_OBJECT_FILTER );
 628     vlc_object_attach( p_filter, p_this );
 629
 630     p_filter->pf_vout_buffer_new =
 631         (picture_t *(*)(filter_t *))video_new_buffer;
 632     p_filter->pf_vout_buffer_del =
 633         (void (*)(filter_t *, picture_t *))video_del_buffer;
 634
 635     p_filter->fmt_in = *p_fmt_in;
 636     p_filter->fmt_out = *p_fmt_in;
 637     p_filter->fmt_out.i_codec = p_fmt_out->i_chroma;
 638     p_filter->fmt_out.video = *p_fmt_out;
 639     p_filter->p_module = module_Need( p_filter, "video filter2", 0, 0 );
 640
 641     if( !p_filter->p_module )
 642     {
 643         msg_Dbg( p_filter, "no video filter found" );
 644         DeleteFilter( p_filter );
 645         return NULL;
 646     }
 647
 648     return p_filter;
 649 }
 650
 651 static void DeleteFilter( filter_t * p_filter )
 652 {
 653     vlc_object_detach( p_filter );
 654
 655     if( p_filter->p_module ) module_Unneed( p_filter, p_filter->p_module );
 656
 657     es_format_Clean( &p_filter->fmt_in );
 658     es_format_Clean( &p_filter->fmt_out );
 659
 660     vlc_object_destroy( p_filter );
 661 }