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