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