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 #include <ctype.h>
  33 #include <errno.h>
  34 #ifdef HAVE_CONFIG_H
  35 # include "config.h"
  36 #endif
  37
  38 #include <vlc/vlc.h>
  39 #include <vlc_codec.h>
  40 #include <vlc_filter.h>
  41 #include <vlc_es.h>
  42 #include <vlc_image.h>
  43 #include <vlc_stream.h>
  44 #include <vlc_charset.h>
  45
  46 static picture_t *ImageRead( image_handler_t *, block_t *,
  47                              video_format_t *, video_format_t * );
  48 static picture_t *ImageReadUrl( image_handler_t *, const char *,
  49                                 video_format_t *, video_format_t * );
  50 static block_t *ImageWrite( image_handler_t *, picture_t *,
  51                             video_format_t *, video_format_t * );
  52 static int ImageWriteUrl( image_handler_t *, picture_t *,
  53                           video_format_t *, video_format_t *, const char * );
  54
  55 static picture_t *ImageConvert( image_handler_t *, picture_t *,
  56                                 video_format_t *, video_format_t * );
  57 static picture_t *ImageFilter( image_handler_t *, picture_t *,
  58                                video_format_t *, const char *psz_module );
  59
  60 static decoder_t *CreateDecoder( vlc_object_t *, video_format_t * );
  61 static void DeleteDecoder( decoder_t * );
  62 static encoder_t *CreateEncoder( vlc_object_t *, video_format_t *,
  63                                  video_format_t * );
  64 static void DeleteEncoder( encoder_t * );
  65 static filter_t *CreateFilter( vlc_object_t *, es_format_t *,
  66                                video_format_t *, const char * );
  67 static void DeleteFilter( filter_t * );
  68
  69 static vlc_fourcc_t Ext2Fourcc( const char * );
  70 /*static const char *Fourcc2Ext( vlc_fourcc_t );*/
  71
  72 /**
  73  * Create an image_handler_t instance
  74  *
  75  */
  76 image_handler_t *__image_HandlerCreate( vlc_object_t *p_this )
  77 {
  78     image_handler_t *p_image = malloc( sizeof(image_handler_t) );
  79
  80     memset( p_image, 0, sizeof(image_handler_t) );
  81     p_image->p_parent = p_this;
  82
  83     p_image->pf_read = ImageRead;
  84     p_image->pf_read_url = ImageReadUrl;
  85     p_image->pf_write = ImageWrite;
  86     p_image->pf_write_url = ImageWriteUrl;
  87     p_image->pf_convert = ImageConvert;
  88     p_image->pf_filter = ImageFilter;
  89
  90     return p_image;
  91 }
  92
  93 /**
  94  * Delete the image_handler_t instance
  95  *
  96  */
  97 void image_HandlerDelete( image_handler_t *p_image )
  98 {
  99     if( !p_image ) return;
 100
 101     if( p_image->p_dec ) DeleteDecoder( p_image->p_dec );
 102     if( p_image->p_enc ) DeleteEncoder( p_image->p_enc );
 103     if( p_image->p_filter ) DeleteFilter( p_image->p_filter );
 104
 105     free( p_image );
 106     p_image = NULL;
 107 }
 108
 109 /**
 110  * Read an image
 111  *
 112  */
 113
 114 static picture_t *ImageRead( image_handler_t *p_image, block_t *p_block,
 115                              video_format_t *p_fmt_in,
 116                              video_format_t *p_fmt_out )
 117 {
 118     picture_t *p_pic = NULL, *p_tmp;
 119
 120     /* Check if we can reuse the current decoder */
 121     if( p_image->p_dec &&
 122         p_image->p_dec->fmt_in.i_codec != p_fmt_in->i_chroma )
 123     {
 124         DeleteDecoder( p_image->p_dec );
 125         p_image->p_dec = 0;
 126     }
 127
 128     /* Start a decoder */
 129     if( !p_image->p_dec )
 130     {
 131         p_image->p_dec = CreateDecoder( p_image->p_parent, p_fmt_in );
 132         if( !p_image->p_dec ) return NULL;
 133     }
 134
 135     p_block->i_pts = p_block->i_dts = mdate();
 136     while( (p_tmp = p_image->p_dec->pf_decode_video( p_image->p_dec, &p_block ))
 137              != NULL )
 138     {
 139         if ( p_pic != NULL )
 140             p_pic->pf_release( p_pic );
 141         p_pic = p_tmp;
 142     }
 143
 144     if( p_pic == NULL )
 145     {
 146         msg_Warn( p_image->p_parent, "no image decoded" );
 147         return 0;
 148     }
 149
 150     if( !p_fmt_out->i_chroma )
 151         p_fmt_out->i_chroma = p_image->p_dec->fmt_out.video.i_chroma;
 152     if( !p_fmt_out->i_width && p_fmt_out->i_height )
 153         p_fmt_out->i_width = p_fmt_out->i_height
 154                               * p_image->p_dec->fmt_out.video.i_aspect
 155                               / VOUT_ASPECT_FACTOR;
 156     if( !p_fmt_out->i_height && p_fmt_out->i_width )
 157         p_fmt_out->i_height = p_fmt_out->i_width * VOUT_ASPECT_FACTOR
 158                                / p_image->p_dec->fmt_out.video.i_aspect;
 159     if( !p_fmt_out->i_width )
 160         p_fmt_out->i_width = p_image->p_dec->fmt_out.video.i_width;
 161     if( !p_fmt_out->i_height )
 162         p_fmt_out->i_height = p_image->p_dec->fmt_out.video.i_height;
 163
 164     /* Check if we need chroma conversion or resizing */
 165     if( p_image->p_dec->fmt_out.video.i_chroma != p_fmt_out->i_chroma ||
 166         p_image->p_dec->fmt_out.video.i_width != p_fmt_out->i_width ||
 167         p_image->p_dec->fmt_out.video.i_height != p_fmt_out->i_height )
 168     {
 169         if( p_image->p_filter )
 170         if( p_image->p_filter->fmt_in.video.i_chroma !=
 171             p_image->p_dec->fmt_out.video.i_chroma ||
 172             p_image->p_filter->fmt_out.video.i_chroma != p_fmt_out->i_chroma )
 173         {
 174             /* We need to restart a new filter */
 175             DeleteFilter( p_image->p_filter );
 176             p_image->p_filter = 0;
 177         }
 178
 179         /* Start a filter */
 180         if( !p_image->p_filter )
 181         {
 182             p_image->p_filter =
 183                 CreateFilter( p_image->p_parent, &p_image->p_dec->fmt_out,
 184                               p_fmt_out, NULL );
 185
 186             if( !p_image->p_filter )
 187             {
 188                 p_pic->pf_release( p_pic );
 189                 return NULL;
 190             }
 191         }
 192         else
 193         {
 194             /* Filters should handle on-the-fly size changes */
 195             p_image->p_filter->fmt_in = p_image->p_dec->fmt_out;
 196             p_image->p_filter->fmt_out = p_image->p_dec->fmt_out;
 197             p_image->p_filter->fmt_out.i_codec = p_fmt_out->i_chroma;
 198             p_image->p_filter->fmt_out.video = *p_fmt_out;
 199         }
 200
 201         p_pic = p_image->p_filter->pf_video_filter( p_image->p_filter, p_pic );
 202         *p_fmt_out = p_image->p_filter->fmt_out.video;
 203     }
 204     else *p_fmt_out = p_image->p_dec->fmt_out.video;
 205
 206     return p_pic;
 207 }
 208
 209 static picture_t *ImageReadUrl( image_handler_t *p_image, const char *psz_url,
 210                                 video_format_t *p_fmt_in,
 211                                 video_format_t *p_fmt_out )
 212 {
 213     block_t *p_block;
 214     picture_t *p_pic;
 215     stream_t *p_stream = NULL;
 216     int i_size;
 217
 218     p_stream = stream_UrlNew( p_image->p_parent, psz_url );
 219
 220     if( !p_stream )
 221     {
 222         msg_Dbg( p_image->p_parent, "could not open %s for reading",
 223                  psz_url );
 224         return NULL;
 225     }
 226
 227     i_size = stream_Size( p_stream );
 228
 229     p_block = block_New( p_image->p_parent, i_size );
 230
 231     stream_Read( p_stream, p_block->p_buffer, i_size );
 232     stream_Delete( p_stream );
 233
 234     if( !p_fmt_in->i_chroma )
 235     {
 236         /* Try to guess format from file name */
 237         p_fmt_in->i_chroma = Ext2Fourcc( psz_url );
 238     }
 239
 240     p_pic = ImageRead( p_image, p_block, p_fmt_in, p_fmt_out );
 241
 242     return p_pic;
 243 }
 244
 245 /**
 246  * Write an image
 247  *
 248  */
 249
 250 static block_t *ImageWrite( image_handler_t *p_image, picture_t *p_pic,
 251                             video_format_t *p_fmt_in,
 252                             video_format_t *p_fmt_out )
 253 {
 254     block_t *p_block;
 255     void (*pf_release)( picture_t * );
 256
 257     /* Check if we can reuse the current encoder */
 258     if( p_image->p_enc &&
 259         ( p_image->p_enc->fmt_out.i_codec != p_fmt_out->i_chroma ||
 260           p_image->p_enc->fmt_out.video.i_width != p_fmt_out->i_width ||
 261           p_image->p_enc->fmt_out.video.i_height != p_fmt_out->i_height ) )
 262     {
 263         DeleteEncoder( p_image->p_enc );
 264         p_image->p_enc = 0;
 265     }
 266
 267     /* Start an encoder */
 268     if( !p_image->p_enc )
 269     {
 270         p_image->p_enc = CreateEncoder( p_image->p_parent,
 271                                         p_fmt_in, p_fmt_out );
 272         if( !p_image->p_enc ) return NULL;
 273     }
 274
 275     /* Check if we need chroma conversion or resizing */
 276     if( p_image->p_enc->fmt_in.video.i_chroma != p_fmt_in->i_chroma ||
 277         p_image->p_enc->fmt_in.video.i_width != p_fmt_in->i_width ||
 278         p_image->p_enc->fmt_in.video.i_height != p_fmt_in->i_height )
 279     {
 280         picture_t *p_tmp_pic;
 281
 282         if( p_image->p_filter )
 283         if( p_image->p_filter->fmt_in.video.i_chroma != p_fmt_in->i_chroma ||
 284             p_image->p_filter->fmt_out.video.i_chroma !=
 285             p_image->p_enc->fmt_in.video.i_chroma )
 286         {
 287             /* We need to restart a new filter */
 288             DeleteFilter( p_image->p_filter );
 289             p_image->p_filter = 0;
 290         }
 291
 292         /* Start a filter */
 293         if( !p_image->p_filter )
 294         {
 295             es_format_t fmt_in;
 296             es_format_Init( &fmt_in, VIDEO_ES, p_fmt_in->i_chroma );
 297             fmt_in.video = *p_fmt_in;
 298
 299             p_image->p_filter =
 300                 CreateFilter( p_image->p_parent, &fmt_in,
 301                               &p_image->p_enc->fmt_in.video, NULL );
 302
 303             if( !p_image->p_filter )
 304             {
 305                 return NULL;
 306             }
 307         }
 308         else
 309         {
 310             /* Filters should handle on-the-fly size changes */
 311             p_image->p_filter->fmt_in.i_codec = p_fmt_in->i_chroma;
 312             p_image->p_filter->fmt_out.video = *p_fmt_in;
 313             p_image->p_filter->fmt_out.i_codec =p_image->p_enc->fmt_in.i_codec;
 314             p_image->p_filter->fmt_out.video = p_image->p_enc->fmt_in.video;
 315         }
 316
 317         p_pic->i_refcount++; /* pf_video_filter() will call pf_release() */
 318         p_tmp_pic =
 319             p_image->p_filter->pf_video_filter( p_image->p_filter, p_pic );
 320
 321         p_block = p_image->p_enc->pf_encode_video( p_image->p_enc, p_tmp_pic );
 322
 323         p_image->p_filter->pf_vout_buffer_del( p_image->p_filter, p_tmp_pic );
 324     }
 325     else
 326     {
 327         p_block = p_image->p_enc->pf_encode_video( p_image->p_enc, p_pic );
 328     }
 329
 330     if( !p_block )
 331     {
 332         msg_Dbg( p_image->p_parent, "no image encoded" );
 333         return 0;
 334     }
 335
 336     return p_block;
 337 }
 338
 339 static int ImageWriteUrl( image_handler_t *p_image, picture_t *p_pic,
 340                           video_format_t *p_fmt_in, video_format_t *p_fmt_out,
 341                           const char *psz_url )
 342 {
 343     block_t *p_block;
 344     FILE *file;
 345
 346     if( !p_fmt_out->i_chroma )
 347     {
 348         /* Try to guess format from file name */
 349         p_fmt_out->i_chroma = Ext2Fourcc( psz_url );
 350     }
 351
 352     file = utf8_fopen( psz_url, "wb" );
 353     if( !file )
 354     {
 355         msg_Err( p_image->p_parent, "%s: %m", psz_url );
 356         return VLC_EGENERIC;
 357     }
 358
 359     p_block = ImageWrite( p_image, p_pic, p_fmt_in, p_fmt_out );
 360
 361     int err = 0;
 362     if( p_block )
 363     {
 364         if( fwrite( p_block->p_buffer, p_block->i_buffer, 1, file ) != 1 )
 365             err = errno;
 366         block_Release( p_block );
 367     }
 368
 369     if( fclose( file ) && !err )
 370         err = errno;
 371
 372     if( err )
 373     {
 374        errno = err;
 375        msg_Err( p_image->p_parent, "%s: %m", psz_url );
 376     }
 377
 378     return err ? VLC_EGENERIC : VLC_SUCCESS;
 379 }
 380
 381 /**
 382  * Convert an image to a different format
 383  *
 384  */
 385
 386 static picture_t *ImageConvert( image_handler_t *p_image, picture_t *p_pic,
 387                                 video_format_t *p_fmt_in,
 388                                 video_format_t *p_fmt_out )
 389 {
 390     picture_t *p_pif;
 391
 392     if( !p_fmt_out->i_width && !p_fmt_out->i_height &&
 393         p_fmt_out->i_sar_num && p_fmt_out->i_sar_den &&
 394         p_fmt_out->i_sar_num * p_fmt_in->i_sar_den !=
 395         p_fmt_out->i_sar_den * p_fmt_in->i_sar_num )
 396     {
 397         p_fmt_out->i_width =
 398             p_fmt_in->i_sar_num * (int64_t)p_fmt_out->i_sar_den *
 399             p_fmt_in->i_width / p_fmt_in->i_sar_den / p_fmt_out->i_sar_num;
 400         p_fmt_out->i_visible_width =
 401             p_fmt_in->i_sar_num * (int64_t)p_fmt_out->i_sar_den *
 402             p_fmt_in->i_visible_width / p_fmt_in->i_sar_den /
 403             p_fmt_out->i_sar_num;
 404     }
 405
 406     if( !p_fmt_out->i_chroma ) p_fmt_out->i_chroma = p_fmt_in->i_chroma;
 407     if( !p_fmt_out->i_width )
 408         p_fmt_out->i_width = p_fmt_out->i_visible_width = p_fmt_in->i_width;
 409     if( !p_fmt_out->i_height )
 410         p_fmt_out->i_height = p_fmt_out->i_visible_height = p_fmt_in->i_height;
 411     if( !p_fmt_out->i_sar_num ) p_fmt_out->i_sar_num = p_fmt_in->i_sar_num;
 412     if( !p_fmt_out->i_sar_den ) p_fmt_out->i_sar_den = p_fmt_in->i_sar_den;
 413     if( !p_fmt_out->i_aspect ) p_fmt_out->i_aspect = p_fmt_in->i_aspect;
 414
 415     if( p_image->p_filter )
 416     if( p_image->p_filter->fmt_in.video.i_chroma != p_fmt_in->i_chroma ||
 417         p_image->p_filter->fmt_out.video.i_chroma != p_fmt_out->i_chroma )
 418     {
 419         /* We need to restart a new filter */
 420         DeleteFilter( p_image->p_filter );
 421         p_image->p_filter = NULL;
 422     }
 423
 424     /* Start a filter */
 425     if( !p_image->p_filter )
 426     {
 427         es_format_t fmt_in;
 428         es_format_Init( &fmt_in, VIDEO_ES, p_fmt_in->i_chroma );
 429         fmt_in.video = *p_fmt_in;
 430
 431         p_image->p_filter =
 432             CreateFilter( p_image->p_parent, &fmt_in, p_fmt_out, NULL );
 433
 434         if( !p_image->p_filter )
 435         {
 436             return NULL;
 437         }
 438     }
 439     else
 440     {
 441         /* Filters should handle on-the-fly size changes */
 442         p_image->p_filter->fmt_in.video = *p_fmt_in;
 443         p_image->p_filter->fmt_out.video = *p_fmt_out;
 444     }
 445
 446     p_pic->i_refcount++; /* pf_video_filter() will call pf_release() */
 447     p_pif = p_image->p_filter->pf_video_filter( p_image->p_filter, p_pic );
 448
 449     if( p_fmt_in->i_chroma == p_fmt_out->i_chroma &&
 450         p_fmt_in->i_width == p_fmt_out->i_width &&
 451         p_fmt_in->i_height == p_fmt_out->i_height )
 452     {
 453         /* Duplicate image */
 454         p_pif->pf_release( p_pif ); /* XXX: Better fix must be possible */
 455         p_pif = p_image->p_filter->pf_vout_buffer_new( p_image->p_filter );
 456         if( p_pif ) vout_CopyPicture( p_image->p_parent, p_pif, p_pic );
 457     }
 458
 459     return p_pif;
 460 }
 461
 462 /**
 463  * Filter an image with a psz_module filter
 464  *
 465  */
 466
 467 static picture_t *ImageFilter( image_handler_t *p_image, picture_t *p_pic,
 468                                video_format_t *p_fmt, const char *psz_module )
 469 {
 470     /* Start a filter */
 471     if( !p_image->p_filter )
 472     {
 473         es_format_t fmt;
 474         es_format_Init( &fmt, VIDEO_ES, p_fmt->i_chroma );
 475         fmt.video = *p_fmt;
 476
 477         p_image->p_filter =
 478             CreateFilter( p_image->p_parent, &fmt, &fmt.video, psz_module );
 479
 480         if( !p_image->p_filter )
 481         {
 482             return NULL;
 483         }
 484     }
 485     else
 486     {
 487         /* Filters should handle on-the-fly size changes */
 488         p_image->p_filter->fmt_in.video = *p_fmt;
 489         p_image->p_filter->fmt_out.video = *p_fmt;
 490     }
 491
 492     p_pic->i_refcount++; /* pf_video_filter() will call pf_release() */
 493     return p_image->p_filter->pf_video_filter( p_image->p_filter, p_pic );
 494 }
 495
 496 /**
 497  * Misc functions
 498  *
 499  */
 500 static struct
 501 {
 502     vlc_fourcc_t i_codec;
 503     const char *psz_ext;
 504
 505 } ext_table[] =
 506 {
 507     { VLC_FOURCC('j','p','e','g'), "jpeg" },
 508     { VLC_FOURCC('j','p','e','g'), "jpg"  },
 509     { VLC_FOURCC('l','j','p','g'), "ljpg" },
 510     { VLC_FOURCC('p','n','g',' '), "png" },
 511     { VLC_FOURCC('p','g','m',' '), "pgm" },
 512     { VLC_FOURCC('p','g','m','y'), "pgmyuv" },
 513     { VLC_FOURCC('p','b','m',' '), "pbm" },
 514     { VLC_FOURCC('p','a','m',' '), "pam" },
 515     { VLC_FOURCC('t','g','a',' '), "tga" },
 516     { VLC_FOURCC('b','m','p',' '), "bmp" },
 517     { VLC_FOURCC('p','n','m',' '), "pnm" },
 518     { VLC_FOURCC('x','p','m',' '), "xpm" },
 519     { VLC_FOURCC('x','c','f',' '), "xcf" },
 520     { VLC_FOURCC('p','c','x',' '), "pcx" },
 521     { VLC_FOURCC('g','i','f',' '), "gif" },
 522     { VLC_FOURCC('t','i','f','f'), "tif" },
 523     { VLC_FOURCC('t','i','f','f'), "tiff" },
 524     { VLC_FOURCC('l','b','m',' '), "lbm" },
 525     { 0, NULL }
 526 };
 527
 528 static vlc_fourcc_t Ext2Fourcc( const char *psz_name )
 529 {
 530     int i;
 531
 532     psz_name = strrchr( psz_name, '.' );
 533     if( !psz_name ) return 0;
 534     psz_name++;
 535
 536     for( i = 0; ext_table[i].i_codec; i++ )
 537     {
 538         int j;
 539         for( j = 0; toupper(ext_table[i].psz_ext[j]) == toupper(psz_name[j]);
 540              j++ )
 541         {
 542             if( !ext_table[i].psz_ext[j] && !psz_name[j] )
 543                 return ext_table[i].i_codec;
 544         }
 545     }
 546
 547     return 0;
 548 }
 549
 550 /*
 551 static const char *Fourcc2Ext( vlc_fourcc_t i_codec )
 552 {
 553     int i;
 554
 555     for( i = 0; ext_table[i].i_codec != 0; i++ )
 556     {
 557         if( ext_table[i].i_codec == i_codec ) return ext_table[i].psz_ext;
 558     }
 559
 560     return NULL;
 561 }
 562 */
 563
 564 static void video_release_buffer( picture_t *p_pic )
 565 {
 566     if( p_pic )
 567     {
 568         free( p_pic->p_data_orig );
 569         free( p_pic->p_sys );
 570         free( p_pic );
 571     }
 572 }
 573
 574 static picture_t *video_new_buffer( decoder_t *p_dec )
 575 {
 576     picture_t *p_pic = malloc( sizeof(picture_t) );
 577
 578     p_dec->fmt_out.video.i_chroma = p_dec->fmt_out.i_codec;
 579     vout_AllocatePicture( VLC_OBJECT(p_dec), p_pic,
 580                           p_dec->fmt_out.video.i_chroma,
 581                           p_dec->fmt_out.video.i_width,
 582                           p_dec->fmt_out.video.i_height,
 583                           p_dec->fmt_out.video.i_aspect );
 584
 585     if( !p_pic->i_planes )
 586     {
 587         free( p_pic );
 588         return 0;
 589     }
 590
 591     p_pic->pf_release = video_release_buffer;
 592     p_pic->i_status = RESERVED_PICTURE;
 593     p_pic->p_sys = NULL;
 594
 595     return p_pic;
 596 }
 597
 598 static void video_del_buffer( decoder_t *p_dec, picture_t *p_pic )
 599 {
 600     (void)p_dec;
 601     if( p_pic )
 602     {
 603         free( p_pic->p_data_orig );
 604         free( p_pic->p_sys );
 605         free( p_pic );
 606     }
 607 }
 608
 609 static void video_link_picture( decoder_t *p_dec, picture_t *p_pic )
 610 {
 611     (void)p_dec; (void)p_pic;
 612 }
 613
 614 static void video_unlink_picture( decoder_t *p_dec, picture_t *p_pic )
 615 {
 616     (void)p_dec; (void)p_pic;
 617 }
 618
 619 static decoder_t *CreateDecoder( vlc_object_t *p_this, video_format_t *fmt )
 620 {
 621     decoder_t *p_dec;
 622
 623     p_dec = vlc_object_create( p_this, VLC_OBJECT_DECODER );
 624     if( p_dec == NULL )
 625     {
 626         msg_Err( p_this, "out of memory" );
 627         return NULL;
 628     }
 629
 630     p_dec->p_module = NULL;
 631     es_format_Init( &p_dec->fmt_in, VIDEO_ES, fmt->i_chroma );
 632     es_format_Init( &p_dec->fmt_out, VIDEO_ES, 0 );
 633     p_dec->fmt_in.video = *fmt;
 634     p_dec->b_pace_control = true;
 635
 636     p_dec->pf_vout_buffer_new = video_new_buffer;
 637     p_dec->pf_vout_buffer_del = video_del_buffer;
 638     p_dec->pf_picture_link    = video_link_picture;
 639     p_dec->pf_picture_unlink  = video_unlink_picture;
 640
 641     vlc_object_attach( p_dec, p_this );
 642
 643     /* Find a suitable decoder module */
 644     p_dec->p_module = module_Need( p_dec, "decoder", "$codec", 0 );
 645     if( !p_dec->p_module )
 646     {
 647         msg_Err( p_dec, "no suitable decoder module for fourcc `%4.4s'.\n"
 648                  "VLC probably does not support this image format.",
 649                  (char*)&p_dec->fmt_in.i_codec );
 650
 651         DeleteDecoder( p_dec );
 652         return NULL;
 653     }
 654
 655     return p_dec;
 656 }
 657
 658 static void DeleteDecoder( decoder_t * p_dec )
 659 {
 660     vlc_object_detach( p_dec );
 661
 662     if( p_dec->p_module ) module_Unneed( p_dec, p_dec->p_module );
 663
 664     es_format_Clean( &p_dec->fmt_in );
 665     es_format_Clean( &p_dec->fmt_out );
 666
 667     vlc_object_release( p_dec );
 668     p_dec = NULL;
 669 }
 670
 671 static encoder_t *CreateEncoder( vlc_object_t *p_this, video_format_t *fmt_in,
 672                                  video_format_t *fmt_out )
 673 {
 674     encoder_t *p_enc;
 675
 676     p_enc = vlc_object_create( p_this, VLC_OBJECT_ENCODER );
 677     if( p_enc == NULL )
 678     {
 679         msg_Err( p_this, "out of memory" );
 680         return NULL;
 681     }
 682
 683     p_enc->p_module = NULL;
 684     es_format_Init( &p_enc->fmt_in, VIDEO_ES, fmt_in->i_chroma );
 685     p_enc->fmt_in.video = *fmt_in;
 686     if( fmt_out->i_width > 0 && fmt_out->i_height > 0 )
 687     {
 688         p_enc->fmt_in.video.i_width = fmt_out->i_width;
 689         p_enc->fmt_in.video.i_height = fmt_out->i_height;
 690
 691         if( fmt_out->i_visible_width > 0 &&
 692             fmt_out->i_visible_height > 0 )
 693         {
 694             p_enc->fmt_in.video.i_visible_width = fmt_out->i_visible_width;
 695             p_enc->fmt_in.video.i_visible_height = fmt_out->i_visible_height;
 696         }
 697         else
 698         {
 699             p_enc->fmt_in.video.i_visible_width = fmt_out->i_width;
 700             p_enc->fmt_in.video.i_visible_height = fmt_out->i_height;
 701         }
 702     }
 703     else if( fmt_out->i_sar_num && fmt_out->i_sar_den &&
 704              fmt_out->i_sar_num * fmt_in->i_sar_den !=
 705              fmt_out->i_sar_den * fmt_in->i_sar_num )
 706     {
 707         p_enc->fmt_in.video.i_width =
 708             fmt_in->i_sar_num * (int64_t)fmt_out->i_sar_den * fmt_in->i_width /
 709             fmt_in->i_sar_den / fmt_out->i_sar_num;
 710         p_enc->fmt_in.video.i_visible_width =
 711             fmt_in->i_sar_num * (int64_t)fmt_out->i_sar_den *
 712             fmt_in->i_visible_width / fmt_in->i_sar_den / fmt_out->i_sar_num;
 713     }
 714
 715     p_enc->fmt_in.video.i_frame_rate = 25;
 716     p_enc->fmt_in.video.i_frame_rate_base = 1;
 717
 718     es_format_Init( &p_enc->fmt_out, VIDEO_ES, fmt_out->i_chroma );
 719     p_enc->fmt_out.video = *fmt_out;
 720     p_enc->fmt_out.video.i_width = p_enc->fmt_in.video.i_width;
 721     p_enc->fmt_out.video.i_height = p_enc->fmt_in.video.i_height;
 722
 723     vlc_object_attach( p_enc, p_this );
 724
 725     /* Find a suitable decoder module */
 726     p_enc->p_module = module_Need( p_enc, "encoder", 0, 0 );
 727     if( !p_enc->p_module )
 728     {
 729         msg_Err( p_enc, "no suitable encoder module for fourcc `%4.4s'.\n"
 730                  "VLC probably does not support this image format.",
 731                  (char*)&p_enc->fmt_out.i_codec );
 732
 733         DeleteEncoder( p_enc );
 734         return NULL;
 735     }
 736     p_enc->fmt_in.video.i_chroma = p_enc->fmt_in.i_codec;
 737
 738     return p_enc;
 739 }
 740
 741 static void DeleteEncoder( encoder_t * p_enc )
 742 {
 743     vlc_object_detach( p_enc );
 744
 745     if( p_enc->p_module ) module_Unneed( p_enc, p_enc->p_module );
 746
 747     es_format_Clean( &p_enc->fmt_in );
 748     es_format_Clean( &p_enc->fmt_out );
 749
 750     vlc_object_release( p_enc );
 751     p_enc = NULL;
 752 }
 753
 754 static filter_t *CreateFilter( vlc_object_t *p_this, es_format_t *p_fmt_in,
 755                                video_format_t *p_fmt_out,
 756                                const char *psz_module )
 757 {
 758     filter_t *p_filter;
 759
 760     p_filter = vlc_object_create( p_this, VLC_OBJECT_FILTER );
 761     vlc_object_attach( p_filter, p_this );
 762
 763     p_filter->pf_vout_buffer_new =
 764         (picture_t *(*)(filter_t *))video_new_buffer;
 765     p_filter->pf_vout_buffer_del =
 766         (void (*)(filter_t *, picture_t *))video_del_buffer;
 767
 768     p_filter->fmt_in = *p_fmt_in;
 769     p_filter->fmt_out = *p_fmt_in;
 770     p_filter->fmt_out.i_codec = p_fmt_out->i_chroma;
 771     p_filter->fmt_out.video = *p_fmt_out;
 772     p_filter->p_module = module_Need( p_filter, "video filter2",
 773                                       psz_module, 0 );
 774
 775     if( !p_filter->p_module )
 776     {
 777         msg_Dbg( p_filter, "no video filter found" );
 778         DeleteFilter( p_filter );
 779         return NULL;
 780     }
 781
 782     return p_filter;
 783 }
 784
 785 static void DeleteFilter( filter_t * p_filter )
 786 {
 787     vlc_object_detach( p_filter );
 788
 789     if( p_filter->p_module ) module_Unneed( p_filter, p_filter->p_module );
 790
 791     es_format_Clean( &p_filter->fmt_in );
 792     es_format_Clean( &p_filter->fmt_out );
 793
 794     vlc_object_release( p_filter );
 795     p_filter = NULL;
 796 }