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_common.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
 256     /* Check if we can reuse the current encoder */
 257     if( p_image->p_enc &&
 258         ( p_image->p_enc->fmt_out.i_codec != p_fmt_out->i_chroma ||
 259           p_image->p_enc->fmt_out.video.i_width != p_fmt_out->i_width ||
 260           p_image->p_enc->fmt_out.video.i_height != p_fmt_out->i_height ) )
 261     {
 262         DeleteEncoder( p_image->p_enc );
 263         p_image->p_enc = 0;
 264     }
 265
 266     /* Start an encoder */
 267     if( !p_image->p_enc )
 268     {
 269         p_image->p_enc = CreateEncoder( p_image->p_parent,
 270                                         p_fmt_in, p_fmt_out );
 271         if( !p_image->p_enc ) return NULL;
 272     }
 273
 274     /* Check if we need chroma conversion or resizing */
 275     if( p_image->p_enc->fmt_in.video.i_chroma != p_fmt_in->i_chroma ||
 276         p_image->p_enc->fmt_in.video.i_width != p_fmt_in->i_width ||
 277         p_image->p_enc->fmt_in.video.i_height != p_fmt_in->i_height )
 278     {
 279         picture_t *p_tmp_pic;
 280
 281         if( p_image->p_filter )
 282         if( p_image->p_filter->fmt_in.video.i_chroma != p_fmt_in->i_chroma ||
 283             p_image->p_filter->fmt_out.video.i_chroma !=
 284             p_image->p_enc->fmt_in.video.i_chroma )
 285         {
 286             /* We need to restart a new filter */
 287             DeleteFilter( p_image->p_filter );
 288             p_image->p_filter = 0;
 289         }
 290
 291         /* Start a filter */
 292         if( !p_image->p_filter )
 293         {
 294             es_format_t fmt_in;
 295             es_format_Init( &fmt_in, VIDEO_ES, p_fmt_in->i_chroma );
 296             fmt_in.video = *p_fmt_in;
 297
 298             p_image->p_filter =
 299                 CreateFilter( p_image->p_parent, &fmt_in,
 300                               &p_image->p_enc->fmt_in.video, NULL );
 301
 302             if( !p_image->p_filter )
 303             {
 304                 return NULL;
 305             }
 306         }
 307         else
 308         {
 309             /* Filters should handle on-the-fly size changes */
 310             p_image->p_filter->fmt_in.i_codec = p_fmt_in->i_chroma;
 311             p_image->p_filter->fmt_out.video = *p_fmt_in;
 312             p_image->p_filter->fmt_out.i_codec =p_image->p_enc->fmt_in.i_codec;
 313             p_image->p_filter->fmt_out.video = p_image->p_enc->fmt_in.video;
 314         }
 315
 316         p_pic->i_refcount++; /* pf_video_filter() will call pf_release() */
 317         p_tmp_pic =
 318             p_image->p_filter->pf_video_filter( p_image->p_filter, p_pic );
 319
 320         p_block = p_image->p_enc->pf_encode_video( p_image->p_enc, p_tmp_pic );
 321
 322         p_image->p_filter->pf_vout_buffer_del( p_image->p_filter, p_tmp_pic );
 323     }
 324     else
 325     {
 326         p_block = p_image->p_enc->pf_encode_video( p_image->p_enc, p_pic );
 327     }
 328
 329     if( !p_block )
 330     {
 331         msg_Dbg( p_image->p_parent, "no image encoded" );
 332         return 0;
 333     }
 334
 335     return p_block;
 336 }
 337
 338 static int ImageWriteUrl( image_handler_t *p_image, picture_t *p_pic,
 339                           video_format_t *p_fmt_in, video_format_t *p_fmt_out,
 340                           const char *psz_url )
 341 {
 342     block_t *p_block;
 343     FILE *file;
 344
 345     if( !p_fmt_out->i_chroma )
 346     {
 347         /* Try to guess format from file name */
 348         p_fmt_out->i_chroma = Ext2Fourcc( psz_url );
 349     }
 350
 351     file = utf8_fopen( psz_url, "wb" );
 352     if( !file )
 353     {
 354         msg_Err( p_image->p_parent, "%s: %m", psz_url );
 355         return VLC_EGENERIC;
 356     }
 357
 358     p_block = ImageWrite( p_image, p_pic, p_fmt_in, p_fmt_out );
 359
 360     int err = 0;
 361     if( p_block )
 362     {
 363         if( fwrite( p_block->p_buffer, p_block->i_buffer, 1, file ) != 1 )
 364             err = errno;
 365         block_Release( p_block );
 366     }
 367
 368     if( fclose( file ) && !err )
 369         err = errno;
 370
 371     if( err )
 372     {
 373        errno = err;
 374        msg_Err( p_image->p_parent, "%s: %m", psz_url );
 375     }
 376
 377     return err ? VLC_EGENERIC : VLC_SUCCESS;
 378 }
 379
 380 /**
 381  * Convert an image to a different format
 382  *
 383  */
 384
 385 static picture_t *ImageConvert( image_handler_t *p_image, picture_t *p_pic,
 386                                 video_format_t *p_fmt_in,
 387                                 video_format_t *p_fmt_out )
 388 {
 389     picture_t *p_pif;
 390
 391     if( !p_fmt_out->i_width && !p_fmt_out->i_height &&
 392         p_fmt_out->i_sar_num && p_fmt_out->i_sar_den &&
 393         p_fmt_out->i_sar_num * p_fmt_in->i_sar_den !=
 394         p_fmt_out->i_sar_den * p_fmt_in->i_sar_num )
 395     {
 396         p_fmt_out->i_width =
 397             p_fmt_in->i_sar_num * (int64_t)p_fmt_out->i_sar_den *
 398             p_fmt_in->i_width / p_fmt_in->i_sar_den / p_fmt_out->i_sar_num;
 399         p_fmt_out->i_visible_width =
 400             p_fmt_in->i_sar_num * (int64_t)p_fmt_out->i_sar_den *
 401             p_fmt_in->i_visible_width / p_fmt_in->i_sar_den /
 402             p_fmt_out->i_sar_num;
 403     }
 404
 405     if( !p_fmt_out->i_chroma ) p_fmt_out->i_chroma = p_fmt_in->i_chroma;
 406     if( !p_fmt_out->i_width )
 407         p_fmt_out->i_width = p_fmt_out->i_visible_width = p_fmt_in->i_width;
 408     if( !p_fmt_out->i_height )
 409         p_fmt_out->i_height = p_fmt_out->i_visible_height = p_fmt_in->i_height;
 410     if( !p_fmt_out->i_sar_num ) p_fmt_out->i_sar_num = p_fmt_in->i_sar_num;
 411     if( !p_fmt_out->i_sar_den ) p_fmt_out->i_sar_den = p_fmt_in->i_sar_den;
 412     if( !p_fmt_out->i_aspect ) p_fmt_out->i_aspect = p_fmt_in->i_aspect;
 413
 414     if( p_image->p_filter )
 415     if( p_image->p_filter->fmt_in.video.i_chroma != p_fmt_in->i_chroma ||
 416         p_image->p_filter->fmt_out.video.i_chroma != p_fmt_out->i_chroma )
 417     {
 418         /* We need to restart a new filter */
 419         DeleteFilter( p_image->p_filter );
 420         p_image->p_filter = NULL;
 421     }
 422
 423     /* Start a filter */
 424     if( !p_image->p_filter )
 425     {
 426         es_format_t fmt_in;
 427         es_format_Init( &fmt_in, VIDEO_ES, p_fmt_in->i_chroma );
 428         fmt_in.video = *p_fmt_in;
 429
 430         p_image->p_filter =
 431             CreateFilter( p_image->p_parent, &fmt_in, p_fmt_out, NULL );
 432
 433         if( !p_image->p_filter )
 434         {
 435             return NULL;
 436         }
 437     }
 438     else
 439     {
 440         /* Filters should handle on-the-fly size changes */
 441         p_image->p_filter->fmt_in.video = *p_fmt_in;
 442         p_image->p_filter->fmt_out.video = *p_fmt_out;
 443     }
 444
 445     p_pic->i_refcount++; /* pf_video_filter() will call pf_release() */
 446     p_pif = p_image->p_filter->pf_video_filter( p_image->p_filter, p_pic );
 447
 448     if( p_fmt_in->i_chroma == p_fmt_out->i_chroma &&
 449         p_fmt_in->i_width == p_fmt_out->i_width &&
 450         p_fmt_in->i_height == p_fmt_out->i_height )
 451     {
 452         /* Duplicate image */
 453         p_pif->pf_release( p_pif ); /* XXX: Better fix must be possible */
 454         p_pif = p_image->p_filter->pf_vout_buffer_new( p_image->p_filter );
 455         if( p_pif ) vout_CopyPicture( p_image->p_parent, p_pif, p_pic );
 456     }
 457
 458     return p_pif;
 459 }
 460
 461 /**
 462  * Filter an image with a psz_module filter
 463  *
 464  */
 465
 466 static picture_t *ImageFilter( image_handler_t *p_image, picture_t *p_pic,
 467                                video_format_t *p_fmt, const char *psz_module )
 468 {
 469     /* Start a filter */
 470     if( !p_image->p_filter )
 471     {
 472         es_format_t fmt;
 473         es_format_Init( &fmt, VIDEO_ES, p_fmt->i_chroma );
 474         fmt.video = *p_fmt;
 475
 476         p_image->p_filter =
 477             CreateFilter( p_image->p_parent, &fmt, &fmt.video, psz_module );
 478
 479         if( !p_image->p_filter )
 480         {
 481             return NULL;
 482         }
 483     }
 484     else
 485     {
 486         /* Filters should handle on-the-fly size changes */
 487         p_image->p_filter->fmt_in.video = *p_fmt;
 488         p_image->p_filter->fmt_out.video = *p_fmt;
 489     }
 490
 491     p_pic->i_refcount++; /* pf_video_filter() will call pf_release() */
 492     return p_image->p_filter->pf_video_filter( p_image->p_filter, p_pic );
 493 }
 494
 495 /**
 496  * Misc functions
 497  *
 498  */
 499 static struct
 500 {
 501     vlc_fourcc_t i_codec;
 502     const char *psz_ext;
 503
 504 } ext_table[] =
 505 {
 506     { VLC_FOURCC('j','p','e','g'), "jpeg" },
 507     { VLC_FOURCC('j','p','e','g'), "jpg"  },
 508     { VLC_FOURCC('l','j','p','g'), "ljpg" },
 509     { VLC_FOURCC('p','n','g',' '), "png" },
 510     { VLC_FOURCC('p','g','m',' '), "pgm" },
 511     { VLC_FOURCC('p','g','m','y'), "pgmyuv" },
 512     { VLC_FOURCC('p','b','m',' '), "pbm" },
 513     { VLC_FOURCC('p','a','m',' '), "pam" },
 514     { VLC_FOURCC('t','g','a',' '), "tga" },
 515     { VLC_FOURCC('b','m','p',' '), "bmp" },
 516     { VLC_FOURCC('p','n','m',' '), "pnm" },
 517     { VLC_FOURCC('x','p','m',' '), "xpm" },
 518     { VLC_FOURCC('x','c','f',' '), "xcf" },
 519     { VLC_FOURCC('p','c','x',' '), "pcx" },
 520     { VLC_FOURCC('g','i','f',' '), "gif" },
 521     { VLC_FOURCC('t','i','f','f'), "tif" },
 522     { VLC_FOURCC('t','i','f','f'), "tiff" },
 523     { VLC_FOURCC('l','b','m',' '), "lbm" },
 524     { 0, NULL }
 525 };
 526
 527 static vlc_fourcc_t Ext2Fourcc( const char *psz_name )
 528 {
 529     int i;
 530
 531     psz_name = strrchr( psz_name, '.' );
 532     if( !psz_name ) return 0;
 533     psz_name++;
 534
 535     for( i = 0; ext_table[i].i_codec; i++ )
 536     {
 537         int j;
 538         for( j = 0; toupper(ext_table[i].psz_ext[j]) == toupper(psz_name[j]);
 539              j++ )
 540         {
 541             if( !ext_table[i].psz_ext[j] && !psz_name[j] )
 542                 return ext_table[i].i_codec;
 543         }
 544     }
 545
 546     return 0;
 547 }
 548
 549 /*
 550 static const char *Fourcc2Ext( vlc_fourcc_t i_codec )
 551 {
 552     int i;
 553
 554     for( i = 0; ext_table[i].i_codec != 0; i++ )
 555     {
 556         if( ext_table[i].i_codec == i_codec ) return ext_table[i].psz_ext;
 557     }
 558
 559     return NULL;
 560 }
 561 */
 562
 563 static void video_release_buffer( picture_t *p_pic )
 564 {
 565     if( --p_pic->i_refcount > 0 ) return;
 566
 567     free( p_pic->p_data_orig );
 568     free( p_pic->p_sys );
 569     free( p_pic );
 570 }
 571
 572 static picture_t *video_new_buffer( decoder_t *p_dec )
 573 {
 574     picture_t *p_pic = malloc( sizeof(picture_t) );
 575
 576     p_dec->fmt_out.video.i_chroma = p_dec->fmt_out.i_codec;
 577     vout_AllocatePicture( VLC_OBJECT(p_dec), p_pic,
 578                           p_dec->fmt_out.video.i_chroma,
 579                           p_dec->fmt_out.video.i_width,
 580                           p_dec->fmt_out.video.i_height,
 581                           p_dec->fmt_out.video.i_aspect );
 582
 583     if( !p_pic->i_planes )
 584     {
 585         free( p_pic );
 586         return 0;
 587     }
 588
 589     p_pic->i_refcount = 1;
 590     p_pic->pf_release = video_release_buffer;
 591     p_pic->i_status = RESERVED_PICTURE;
 592     p_pic->p_sys = NULL;
 593
 594     return p_pic;
 595 }
 596
 597 static void video_del_buffer( decoder_t *p_dec, picture_t *p_pic )
 598 {
 599     (void)p_dec;
 600     free( p_pic->p_data_orig );
 601     free( p_pic->p_sys );
 602     free( p_pic );
 603 }
 604
 605 static void video_link_picture( decoder_t *p_dec, picture_t *p_pic )
 606 {
 607     (void)p_dec;
 608     p_pic->i_refcount++;
 609 }
 610
 611 static void video_unlink_picture( decoder_t *p_dec, picture_t *p_pic )
 612 {
 613     (void)p_dec; (void)p_pic;
 614     video_release_buffer( p_pic );
 615 }
 616
 617 static decoder_t *CreateDecoder( vlc_object_t *p_this, video_format_t *fmt )
 618 {
 619     decoder_t *p_dec;
 620
 621     p_dec = vlc_object_create( p_this, VLC_OBJECT_DECODER );
 622     if( p_dec == NULL )
 623     {
 624         msg_Err( p_this, "out of memory" );
 625         return NULL;
 626     }
 627
 628     p_dec->p_module = NULL;
 629     es_format_Init( &p_dec->fmt_in, VIDEO_ES, fmt->i_chroma );
 630     es_format_Init( &p_dec->fmt_out, VIDEO_ES, 0 );
 631     p_dec->fmt_in.video = *fmt;
 632     p_dec->b_pace_control = true;
 633
 634     p_dec->pf_vout_buffer_new = video_new_buffer;
 635     p_dec->pf_vout_buffer_del = video_del_buffer;
 636     p_dec->pf_picture_link    = video_link_picture;
 637     p_dec->pf_picture_unlink  = video_unlink_picture;
 638
 639     vlc_object_attach( p_dec, p_this );
 640
 641     /* Find a suitable decoder module */
 642     p_dec->p_module = module_Need( p_dec, "decoder", "$codec", 0 );
 643     if( !p_dec->p_module )
 644     {
 645         msg_Err( p_dec, "no suitable decoder module for fourcc `%4.4s'.\n"
 646                  "VLC probably does not support this image format.",
 647                  (char*)&p_dec->fmt_in.i_codec );
 648
 649         DeleteDecoder( p_dec );
 650         return NULL;
 651     }
 652
 653     return p_dec;
 654 }
 655
 656 static void DeleteDecoder( decoder_t * p_dec )
 657 {
 658     vlc_object_detach( p_dec );
 659
 660     if( p_dec->p_module ) module_Unneed( p_dec, p_dec->p_module );
 661
 662     es_format_Clean( &p_dec->fmt_in );
 663     es_format_Clean( &p_dec->fmt_out );
 664
 665     vlc_object_release( p_dec );
 666     p_dec = NULL;
 667 }
 668
 669 static encoder_t *CreateEncoder( vlc_object_t *p_this, video_format_t *fmt_in,
 670                                  video_format_t *fmt_out )
 671 {
 672     encoder_t *p_enc;
 673
 674     p_enc = vlc_object_create( p_this, VLC_OBJECT_ENCODER );
 675     if( p_enc == NULL )
 676     {
 677         msg_Err( p_this, "out of memory" );
 678         return NULL;
 679     }
 680
 681     p_enc->p_module = NULL;
 682     es_format_Init( &p_enc->fmt_in, VIDEO_ES, fmt_in->i_chroma );
 683     p_enc->fmt_in.video = *fmt_in;
 684     if( fmt_out->i_width > 0 && fmt_out->i_height > 0 )
 685     {
 686         p_enc->fmt_in.video.i_width = fmt_out->i_width;
 687         p_enc->fmt_in.video.i_height = fmt_out->i_height;
 688
 689         if( fmt_out->i_visible_width > 0 &&
 690             fmt_out->i_visible_height > 0 )
 691         {
 692             p_enc->fmt_in.video.i_visible_width = fmt_out->i_visible_width;
 693             p_enc->fmt_in.video.i_visible_height = fmt_out->i_visible_height;
 694         }
 695         else
 696         {
 697             p_enc->fmt_in.video.i_visible_width = fmt_out->i_width;
 698             p_enc->fmt_in.video.i_visible_height = fmt_out->i_height;
 699         }
 700     }
 701     else if( fmt_out->i_sar_num && fmt_out->i_sar_den &&
 702              fmt_out->i_sar_num * fmt_in->i_sar_den !=
 703              fmt_out->i_sar_den * fmt_in->i_sar_num )
 704     {
 705         p_enc->fmt_in.video.i_width =
 706             fmt_in->i_sar_num * (int64_t)fmt_out->i_sar_den * fmt_in->i_width /
 707             fmt_in->i_sar_den / fmt_out->i_sar_num;
 708         p_enc->fmt_in.video.i_visible_width =
 709             fmt_in->i_sar_num * (int64_t)fmt_out->i_sar_den *
 710             fmt_in->i_visible_width / fmt_in->i_sar_den / fmt_out->i_sar_num;
 711     }
 712
 713     p_enc->fmt_in.video.i_frame_rate = 25;
 714     p_enc->fmt_in.video.i_frame_rate_base = 1;
 715
 716     es_format_Init( &p_enc->fmt_out, VIDEO_ES, fmt_out->i_chroma );
 717     p_enc->fmt_out.video = *fmt_out;
 718     p_enc->fmt_out.video.i_width = p_enc->fmt_in.video.i_width;
 719     p_enc->fmt_out.video.i_height = p_enc->fmt_in.video.i_height;
 720
 721     vlc_object_attach( p_enc, p_this );
 722
 723     /* Find a suitable decoder module */
 724     p_enc->p_module = module_Need( p_enc, "encoder", 0, 0 );
 725     if( !p_enc->p_module )
 726     {
 727         msg_Err( p_enc, "no suitable encoder module for fourcc `%4.4s'.\n"
 728                  "VLC probably does not support this image format.",
 729                  (char*)&p_enc->fmt_out.i_codec );
 730
 731         DeleteEncoder( p_enc );
 732         return NULL;
 733     }
 734     p_enc->fmt_in.video.i_chroma = p_enc->fmt_in.i_codec;
 735
 736     return p_enc;
 737 }
 738
 739 static void DeleteEncoder( encoder_t * p_enc )
 740 {
 741     vlc_object_detach( p_enc );
 742
 743     if( p_enc->p_module ) module_Unneed( p_enc, p_enc->p_module );
 744
 745     es_format_Clean( &p_enc->fmt_in );
 746     es_format_Clean( &p_enc->fmt_out );
 747
 748     vlc_object_release( p_enc );
 749     p_enc = NULL;
 750 }
 751
 752 static filter_t *CreateFilter( vlc_object_t *p_this, es_format_t *p_fmt_in,
 753                                video_format_t *p_fmt_out,
 754                                const char *psz_module )
 755 {
 756     filter_t *p_filter;
 757
 758     p_filter = vlc_object_create( p_this, VLC_OBJECT_FILTER );
 759     vlc_object_attach( p_filter, p_this );
 760
 761     p_filter->pf_vout_buffer_new =
 762         (picture_t *(*)(filter_t *))video_new_buffer;
 763     p_filter->pf_vout_buffer_del =
 764         (void (*)(filter_t *, picture_t *))video_del_buffer;
 765
 766     p_filter->fmt_in = *p_fmt_in;
 767     p_filter->fmt_out = *p_fmt_in;
 768     p_filter->fmt_out.i_codec = p_fmt_out->i_chroma;
 769     p_filter->fmt_out.video = *p_fmt_out;
 770     p_filter->p_module = module_Need( p_filter, "video filter2",
 771                                       psz_module, 0 );
 772
 773     if( !p_filter->p_module )
 774     {
 775         msg_Dbg( p_filter, "no video filter found" );
 776         DeleteFilter( p_filter );
 777         return NULL;
 778     }
 779
 780     return p_filter;
 781 }
 782
 783 static void DeleteFilter( filter_t * p_filter )
 784 {
 785     vlc_object_detach( p_filter );
 786
 787     if( p_filter->p_module ) module_Unneed( p_filter, p_filter->p_module );
 788
 789     es_format_Clean( &p_filter->fmt_in );
 790     es_format_Clean( &p_filter->fmt_out );
 791
 792     vlc_object_release( p_filter );
 793     p_filter = NULL;
 794 }