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