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