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 VLC authors and VideoLAN
   5  * $Id$
   6  *
   7  * Author: Gildas Bazin <gbazin@videolan.org>
   8  *
   9  * This program is free software; you can redistribute it and/or modify it
  10  * under the terms of the GNU Lesser General Public License as published by
  11  * the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public License
  20  * along with this program; if not, write to the Free Software Foundation,
  21  * 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 <errno.h>
  38
  39 #include <vlc_common.h>
  40 #include <vlc_codec.h>
  41 #include <vlc_meta.h>
  42 #include <vlc_filter.h>
  43 #include <vlc_es.h>
  44 #include <vlc_image.h>
  45 #include <vlc_stream.h>
  46 #include <vlc_fs.h>
  47 #include <vlc_sout.h>
  48 #include <libvlc.h>
  49 #include <vlc_modules.h>
  50
  51 static picture_t *ImageRead( image_handler_t *, block_t *,
  52                              video_format_t *, video_format_t * );
  53 static picture_t *ImageReadUrl( image_handler_t *, const char *,
  54                                 video_format_t *, video_format_t * );
  55 static block_t *ImageWrite( image_handler_t *, picture_t *,
  56                             video_format_t *, video_format_t * );
  57 static int ImageWriteUrl( image_handler_t *, picture_t *,
  58                           video_format_t *, video_format_t *, const char * );
  59
  60 static picture_t *ImageConvert( image_handler_t *, picture_t *,
  61                                 video_format_t *, video_format_t * );
  62
  63 static decoder_t *CreateDecoder( vlc_object_t *, video_format_t * );
  64 static void DeleteDecoder( decoder_t * );
  65 static encoder_t *CreateEncoder( vlc_object_t *, video_format_t *,
  66                                  video_format_t * );
  67 static void DeleteEncoder( encoder_t * );
  68 static filter_t *CreateFilter( vlc_object_t *, es_format_t *,
  69                                video_format_t * );
  70 static void DeleteFilter( filter_t * );
  71
  72 vlc_fourcc_t image_Type2Fourcc( const char * );
  73 vlc_fourcc_t image_Ext2Fourcc( const char * );
  74 /*static const char *Fourcc2Ext( vlc_fourcc_t );*/
  75
  76 #undef image_HandlerCreate
  77 /**
  78  * Create an image_handler_t instance
  79  *
  80  */
  81 image_handler_t *image_HandlerCreate( vlc_object_t *p_this )
  82 {
  83     image_handler_t *p_image = calloc( 1, sizeof(image_handler_t) );
  84     if( !p_image )
  85         return NULL;
  86
  87     p_image->p_parent = p_this;
  88
  89     p_image->pf_read = ImageRead;
  90     p_image->pf_read_url = ImageReadUrl;
  91     p_image->pf_write = ImageWrite;
  92     p_image->pf_write_url = ImageWriteUrl;
  93     p_image->pf_convert = ImageConvert;
  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 = (int64_t)p_image->p_dec->fmt_out.video.i_width *
 159                              p_image->p_dec->fmt_out.video.i_sar_num *
 160                              p_fmt_out->i_height /
 161                              p_image->p_dec->fmt_out.video.i_height /
 162                              p_image->p_dec->fmt_out.video.i_sar_den;
 163
 164     if( !p_fmt_out->i_height && p_fmt_out->i_width )
 165         p_fmt_out->i_height = (int64_t)p_image->p_dec->fmt_out.video.i_height *
 166                               p_image->p_dec->fmt_out.video.i_sar_den *
 167                               p_fmt_out->i_width /
 168                               p_image->p_dec->fmt_out.video.i_width /
 169                               p_image->p_dec->fmt_out.video.i_sar_num;
 170     if( !p_fmt_out->i_width )
 171         p_fmt_out->i_width = p_image->p_dec->fmt_out.video.i_width;
 172     if( !p_fmt_out->i_height )
 173         p_fmt_out->i_height = p_image->p_dec->fmt_out.video.i_height;
 174     if( !p_fmt_out->i_visible_width )
 175         p_fmt_out->i_visible_width = p_fmt_out->i_width;
 176     if( !p_fmt_out->i_visible_height )
 177         p_fmt_out->i_visible_height = p_fmt_out->i_height;
 178
 179     /* Check if we need chroma conversion or resizing */
 180     if( p_image->p_dec->fmt_out.video.i_chroma != p_fmt_out->i_chroma ||
 181         p_image->p_dec->fmt_out.video.i_width != p_fmt_out->i_width ||
 182         p_image->p_dec->fmt_out.video.i_height != p_fmt_out->i_height )
 183     {
 184         if( p_image->p_filter )
 185         if( p_image->p_filter->fmt_in.video.i_chroma !=
 186             p_image->p_dec->fmt_out.video.i_chroma ||
 187             p_image->p_filter->fmt_out.video.i_chroma != p_fmt_out->i_chroma )
 188         {
 189             /* We need to restart a new filter */
 190             DeleteFilter( p_image->p_filter );
 191             p_image->p_filter = 0;
 192         }
 193
 194         /* Start a filter */
 195         if( !p_image->p_filter )
 196         {
 197             p_image->p_filter =
 198                 CreateFilter( p_image->p_parent, &p_image->p_dec->fmt_out,
 199                               p_fmt_out );
 200
 201             if( !p_image->p_filter )
 202             {
 203                 picture_Release( p_pic );
 204                 return NULL;
 205             }
 206         }
 207         else
 208         {
 209             /* Filters should handle on-the-fly size changes */
 210             p_image->p_filter->fmt_in = p_image->p_dec->fmt_out;
 211             p_image->p_filter->fmt_out = p_image->p_dec->fmt_out;
 212             p_image->p_filter->fmt_out.i_codec = p_fmt_out->i_chroma;
 213             p_image->p_filter->fmt_out.video = *p_fmt_out;
 214         }
 215
 216         p_pic = p_image->p_filter->pf_video_filter( p_image->p_filter, p_pic );
 217         *p_fmt_out = p_image->p_filter->fmt_out.video;
 218     }
 219     else *p_fmt_out = p_image->p_dec->fmt_out.video;
 220
 221     return p_pic;
 222 }
 223
 224 static picture_t *ImageReadUrl( image_handler_t *p_image, const char *psz_url,
 225                                 video_format_t *p_fmt_in,
 226                                 video_format_t *p_fmt_out )
 227 {
 228     block_t *p_block;
 229     picture_t *p_pic;
 230     stream_t *p_stream = NULL;
 231     int i_size;
 232
 233     p_stream = stream_UrlNew( p_image->p_parent, psz_url );
 234
 235     if( !p_stream )
 236     {
 237         msg_Dbg( p_image->p_parent, "could not open %s for reading",
 238                  psz_url );
 239         return NULL;
 240     }
 241
 242     i_size = stream_Size( p_stream );
 243
 244     p_block = block_Alloc( i_size );
 245
 246     stream_Read( p_stream, p_block->p_buffer, i_size );
 247
 248     if( !p_fmt_in->i_chroma )
 249     {
 250         char *psz_mime = NULL;
 251         stream_Control( p_stream, STREAM_GET_CONTENT_TYPE, &psz_mime );
 252         if( psz_mime )
 253             p_fmt_in->i_chroma = image_Mime2Fourcc( psz_mime );
 254         free( psz_mime );
 255     }
 256     stream_Delete( p_stream );
 257
 258     if( !p_fmt_in->i_chroma )
 259     {
 260         /* Try to guess format from file name */
 261         p_fmt_in->i_chroma = image_Ext2Fourcc( psz_url );
 262     }
 263
 264     p_pic = ImageRead( p_image, p_block, p_fmt_in, p_fmt_out );
 265
 266     return p_pic;
 267 }
 268
 269 /**
 270  * Write an image
 271  *
 272  */
 273
 274 static block_t *ImageWrite( image_handler_t *p_image, picture_t *p_pic,
 275                             video_format_t *p_fmt_in,
 276                             video_format_t *p_fmt_out )
 277 {
 278     block_t *p_block;
 279
 280     /* Check if we can reuse the current encoder */
 281     if( p_image->p_enc &&
 282         ( p_image->p_enc->fmt_out.i_codec != p_fmt_out->i_chroma ||
 283           p_image->p_enc->fmt_out.video.i_width != p_fmt_out->i_width ||
 284           p_image->p_enc->fmt_out.video.i_height != p_fmt_out->i_height ) )
 285     {
 286         DeleteEncoder( p_image->p_enc );
 287         p_image->p_enc = 0;
 288     }
 289
 290     /* Start an encoder */
 291     if( !p_image->p_enc )
 292     {
 293         p_image->p_enc = CreateEncoder( p_image->p_parent,
 294                                         p_fmt_in, p_fmt_out );
 295         if( !p_image->p_enc ) return NULL;
 296     }
 297
 298     /* Check if we need chroma conversion or resizing */
 299     if( p_image->p_enc->fmt_in.video.i_chroma != p_fmt_in->i_chroma ||
 300         p_image->p_enc->fmt_in.video.i_width != p_fmt_in->i_width ||
 301         p_image->p_enc->fmt_in.video.i_height != p_fmt_in->i_height )
 302     {
 303         picture_t *p_tmp_pic;
 304
 305         if( p_image->p_filter )
 306         if( p_image->p_filter->fmt_in.video.i_chroma != p_fmt_in->i_chroma ||
 307             p_image->p_filter->fmt_out.video.i_chroma !=
 308             p_image->p_enc->fmt_in.video.i_chroma )
 309         {
 310             /* We need to restart a new filter */
 311             DeleteFilter( p_image->p_filter );
 312             p_image->p_filter = 0;
 313         }
 314
 315         /* Start a filter */
 316         if( !p_image->p_filter )
 317         {
 318             es_format_t fmt_in;
 319             es_format_Init( &fmt_in, VIDEO_ES, p_fmt_in->i_chroma );
 320             fmt_in.video = *p_fmt_in;
 321
 322             p_image->p_filter =
 323                 CreateFilter( p_image->p_parent, &fmt_in,
 324                               &p_image->p_enc->fmt_in.video );
 325
 326             if( !p_image->p_filter )
 327             {
 328                 return NULL;
 329             }
 330         }
 331         else
 332         {
 333             /* Filters should handle on-the-fly size changes */
 334             p_image->p_filter->fmt_in.i_codec = p_fmt_in->i_chroma;
 335             p_image->p_filter->fmt_out.video = *p_fmt_in;
 336             p_image->p_filter->fmt_out.i_codec =p_image->p_enc->fmt_in.i_codec;
 337             p_image->p_filter->fmt_out.video = p_image->p_enc->fmt_in.video;
 338         }
 339
 340         picture_Hold( p_pic );
 341
 342         p_tmp_pic =
 343             p_image->p_filter->pf_video_filter( p_image->p_filter, p_pic );
 344
 345         if( likely(p_tmp_pic != NULL) )
 346         {
 347             p_block = p_image->p_enc->pf_encode_video( p_image->p_enc,
 348                                                        p_tmp_pic );
 349             picture_Release( p_tmp_pic );
 350         }
 351         else
 352             p_block = NULL;
 353     }
 354     else
 355     {
 356         p_block = p_image->p_enc->pf_encode_video( p_image->p_enc, p_pic );
 357     }
 358
 359     if( !p_block )
 360     {
 361         msg_Dbg( p_image->p_parent, "no image encoded" );
 362         return 0;
 363     }
 364
 365     return p_block;
 366 }
 367
 368 static int ImageWriteUrl( image_handler_t *p_image, picture_t *p_pic,
 369                           video_format_t *p_fmt_in, video_format_t *p_fmt_out,
 370                           const char *psz_url )
 371 {
 372     block_t *p_block;
 373     FILE *file;
 374
 375     if( !p_fmt_out->i_chroma )
 376     {
 377         /* Try to guess format from file name */
 378         p_fmt_out->i_chroma = image_Ext2Fourcc( psz_url );
 379     }
 380
 381     file = vlc_fopen( psz_url, "wb" );
 382     if( !file )
 383     {
 384         msg_Err( p_image->p_parent, "%s: %s", psz_url, vlc_strerror_c(errno) );
 385         return VLC_EGENERIC;
 386     }
 387
 388     p_block = ImageWrite( p_image, p_pic, p_fmt_in, p_fmt_out );
 389
 390     int err = 0;
 391     if( p_block )
 392     {
 393         if( fwrite( p_block->p_buffer, p_block->i_buffer, 1, file ) != 1 )
 394             err = errno;
 395         block_Release( p_block );
 396     }
 397
 398     if( fclose( file ) && !err )
 399         err = errno;
 400
 401     if( err )
 402     {
 403        errno = err;
 404        msg_Err( p_image->p_parent, "%s: %s", psz_url, vlc_strerror_c(errno) );
 405     }
 406
 407     return err ? VLC_EGENERIC : VLC_SUCCESS;
 408 }
 409
 410 /**
 411  * Convert an image to a different format
 412  *
 413  */
 414
 415 static picture_t *ImageConvert( image_handler_t *p_image, picture_t *p_pic,
 416                                 video_format_t *p_fmt_in,
 417                                 video_format_t *p_fmt_out )
 418 {
 419     picture_t *p_pif;
 420
 421     if( !p_fmt_out->i_width && !p_fmt_out->i_height &&
 422         p_fmt_out->i_sar_num && p_fmt_out->i_sar_den &&
 423         p_fmt_out->i_sar_num * p_fmt_in->i_sar_den !=
 424         p_fmt_out->i_sar_den * p_fmt_in->i_sar_num )
 425     {
 426         p_fmt_out->i_width =
 427             p_fmt_in->i_sar_num * (int64_t)p_fmt_out->i_sar_den *
 428             p_fmt_in->i_width / p_fmt_in->i_sar_den / p_fmt_out->i_sar_num;
 429         p_fmt_out->i_visible_width =
 430             p_fmt_in->i_sar_num * (int64_t)p_fmt_out->i_sar_den *
 431             p_fmt_in->i_visible_width / p_fmt_in->i_sar_den /
 432             p_fmt_out->i_sar_num;
 433     }
 434
 435     if( !p_fmt_out->i_chroma ) p_fmt_out->i_chroma = p_fmt_in->i_chroma;
 436     if( !p_fmt_out->i_width )
 437         p_fmt_out->i_width = p_fmt_out->i_visible_width = p_fmt_in->i_width;
 438     if( !p_fmt_out->i_height )
 439         p_fmt_out->i_height = p_fmt_out->i_visible_height = p_fmt_in->i_height;
 440     if( !p_fmt_out->i_sar_num ) p_fmt_out->i_sar_num = p_fmt_in->i_sar_num;
 441     if( !p_fmt_out->i_sar_den ) p_fmt_out->i_sar_den = p_fmt_in->i_sar_den;
 442
 443     if( p_image->p_filter )
 444     if( p_image->p_filter->fmt_in.video.i_chroma != p_fmt_in->i_chroma ||
 445         p_image->p_filter->fmt_out.video.i_chroma != p_fmt_out->i_chroma )
 446     {
 447         /* We need to restart a new filter */
 448         DeleteFilter( p_image->p_filter );
 449         p_image->p_filter = NULL;
 450     }
 451
 452     /* Start a filter */
 453     if( !p_image->p_filter )
 454     {
 455         es_format_t fmt_in;
 456         es_format_Init( &fmt_in, VIDEO_ES, p_fmt_in->i_chroma );
 457         fmt_in.video = *p_fmt_in;
 458
 459         p_image->p_filter =
 460             CreateFilter( p_image->p_parent, &fmt_in, p_fmt_out );
 461
 462         if( !p_image->p_filter )
 463         {
 464             return NULL;
 465         }
 466     }
 467     else
 468     {
 469         /* Filters should handle on-the-fly size changes */
 470         p_image->p_filter->fmt_in.video = *p_fmt_in;
 471         p_image->p_filter->fmt_out.video = *p_fmt_out;
 472     }
 473
 474     picture_Hold( p_pic );
 475
 476     p_pif = p_image->p_filter->pf_video_filter( p_image->p_filter, p_pic );
 477
 478     if( p_fmt_in->i_chroma == p_fmt_out->i_chroma &&
 479         p_fmt_in->i_width == p_fmt_out->i_width &&
 480         p_fmt_in->i_height == p_fmt_out->i_height )
 481     {
 482         /* Duplicate image */
 483         picture_Release( p_pif ); /* XXX: Better fix must be possible */
 484         p_pif = filter_NewPicture( p_image->p_filter );
 485         if( p_pif )
 486             picture_Copy( p_pif, p_pic );
 487     }
 488
 489     return p_pif;
 490 }
 491
 492 /**
 493  * Misc functions
 494  *
 495  */
 496 static const struct
 497 {
 498     vlc_fourcc_t i_codec;
 499     const char psz_ext[7];
 500
 501 } ext_table[] =
 502 {
 503     { VLC_CODEC_JPEG,              "jpeg" },
 504     { VLC_CODEC_JPEG,              "jpg"  },
 505     { VLC_CODEC_JPEGLS,            "ljpg" },
 506     { VLC_CODEC_BPG,               "bpg" },
 507     { VLC_CODEC_PNG,               "png" },
 508     { VLC_CODEC_PGM,               "pgm" },
 509     { VLC_CODEC_PGMYUV,            "pgmyuv" },
 510     { VLC_FOURCC('p','b','m',' '), "pbm" },
 511     { VLC_FOURCC('p','a','m',' '), "pam" },
 512     { VLC_CODEC_TARGA,             "tga" },
 513     { VLC_CODEC_BMP,               "bmp" },
 514     { VLC_CODEC_PNM,               "pnm" },
 515     { VLC_FOURCC('x','p','m',' '), "xpm" },
 516     { VLC_FOURCC('x','c','f',' '), "xcf" },
 517     { VLC_CODEC_PCX,               "pcx" },
 518     { VLC_CODEC_GIF,               "gif" },
 519     { VLC_CODEC_SVG,               "svg" },
 520     { VLC_CODEC_TIFF,              "tif" },
 521     { VLC_CODEC_TIFF,              "tiff" },
 522     { VLC_FOURCC('l','b','m',' '), "lbm" },
 523     { VLC_CODEC_PPM,               "ppm" },
 524 };
 525
 526 vlc_fourcc_t image_Type2Fourcc( const char *psz_type )
 527 {
 528     for( unsigned i = 0; i < ARRAY_SIZE(ext_table); i++ )
 529         if( !strcasecmp( ext_table[i].psz_ext, psz_type ) )
 530             return ext_table[i].i_codec;
 531
 532     return 0;
 533 }
 534
 535 vlc_fourcc_t image_Ext2Fourcc( const char *psz_name )
 536 {
 537     psz_name = strrchr( psz_name, '.' );
 538     if( !psz_name ) return 0;
 539     psz_name++;
 540
 541     return image_Type2Fourcc( psz_name );
 542 }
 543
 544 /*
 545 static const char *Fourcc2Ext( vlc_fourcc_t i_codec )
 546 {
 547     for( unsigned i = 0; i < ARRAY_SIZE(ext_table); i++ )
 548         if( ext_table[i].i_codec == i_codec )
 549             return ext_table[i].psz_ext;
 550
 551     return NULL;
 552 }
 553 */
 554
 555 static const struct
 556 {
 557     vlc_fourcc_t i_codec;
 558     const char *psz_mime;
 559 } mime_table[] =
 560 {
 561     { VLC_CODEC_BMP,               "image/bmp" },
 562     { VLC_CODEC_BMP,               "image/x-bmp" },
 563     { VLC_CODEC_BMP,               "image/x-bitmap" },
 564     { VLC_CODEC_BMP,               "image/x-ms-bmp" },
 565     { VLC_CODEC_PNM,               "image/x-portable-anymap" },
 566     { VLC_CODEC_PNM,               "image/x-portable-bitmap" },
 567     { VLC_CODEC_PNM,               "image/x-portable-graymap" },
 568     { VLC_CODEC_PNM,               "image/x-portable-pixmap" },
 569     { VLC_CODEC_GIF,               "image/gif" },
 570     { VLC_CODEC_JPEG,              "image/jpeg" },
 571     { VLC_CODEC_BPG,               "image/bpg" },
 572     { VLC_CODEC_PCX,               "image/pcx" },
 573     { VLC_CODEC_PNG,               "image/png" },
 574     { VLC_CODEC_SVG,               "image/svg+xml" },
 575     { VLC_CODEC_TIFF,              "image/tiff" },
 576     { VLC_CODEC_TARGA,             "image/x-tga" },
 577     { VLC_FOURCC('x','p','m',' '), "image/x-xpixmap" },
 578     { 0, NULL }
 579 };
 580
 581 vlc_fourcc_t image_Mime2Fourcc( const char *psz_mime )
 582 {
 583     int i;
 584     for( i = 0; mime_table[i].i_codec; i++ )
 585         if( !strcmp( psz_mime, mime_table[i].psz_mime ) )
 586             return mime_table[i].i_codec;
 587     return 0;
 588 }
 589
 590 static int video_update_format( decoder_t *p_dec )
 591 {
 592     p_dec->fmt_out.video.i_chroma = p_dec->fmt_out.i_codec;
 593     return 0;
 594 }
 595
 596 static picture_t *video_new_buffer( decoder_t *p_dec )
 597 {
 598     return picture_NewFromFormat( &p_dec->fmt_out.video );
 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_custom_create( p_this, sizeof( *p_dec ), "image 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_format_update = video_update_format;
 616     p_dec->pf_vout_buffer_new = video_new_buffer;
 617
 618     /* Find a suitable decoder module */
 619     p_dec->p_module = module_need( p_dec, "decoder", "$codec", false );
 620     if( !p_dec->p_module )
 621     {
 622         msg_Err( p_dec, "no suitable decoder module for fourcc `%4.4s'. "
 623                  "VLC probably does not support this image format.",
 624                  (char*)&p_dec->fmt_in.i_codec );
 625
 626         DeleteDecoder( p_dec );
 627         return NULL;
 628     }
 629
 630     return p_dec;
 631 }
 632
 633 static void DeleteDecoder( decoder_t * p_dec )
 634 {
 635     if( p_dec->p_module ) module_unneed( p_dec, p_dec->p_module );
 636
 637     es_format_Clean( &p_dec->fmt_in );
 638     es_format_Clean( &p_dec->fmt_out );
 639
 640     if( p_dec->p_description )
 641         vlc_meta_Delete( p_dec->p_description );
 642
 643     vlc_object_release( p_dec );
 644     p_dec = NULL;
 645 }
 646
 647 static encoder_t *CreateEncoder( vlc_object_t *p_this, video_format_t *fmt_in,
 648                                  video_format_t *fmt_out )
 649 {
 650     encoder_t *p_enc;
 651
 652     p_enc = sout_EncoderCreate( p_this );
 653     if( p_enc == NULL )
 654         return NULL;
 655
 656     p_enc->p_module = NULL;
 657     es_format_Init( &p_enc->fmt_in, VIDEO_ES, fmt_in->i_chroma );
 658     p_enc->fmt_in.video = *fmt_in;
 659
 660     if( p_enc->fmt_in.video.i_visible_width == 0 ||
 661         p_enc->fmt_in.video.i_visible_height == 0 )
 662     {
 663         if( fmt_out->i_width > 0 && fmt_out->i_height > 0 )
 664         {
 665             p_enc->fmt_in.video.i_width = fmt_out->i_width;
 666             p_enc->fmt_in.video.i_height = fmt_out->i_height;
 667
 668             if( fmt_out->i_visible_width > 0 &&
 669                 fmt_out->i_visible_height > 0 )
 670             {
 671                 p_enc->fmt_in.video.i_visible_width = fmt_out->i_visible_width;
 672                 p_enc->fmt_in.video.i_visible_height = fmt_out->i_visible_height;
 673             }
 674             else
 675             {
 676                 p_enc->fmt_in.video.i_visible_width = fmt_out->i_width;
 677                 p_enc->fmt_in.video.i_visible_height = fmt_out->i_height;
 678             }
 679         }
 680         else if( fmt_out->i_sar_num && fmt_out->i_sar_den &&
 681                  fmt_out->i_sar_num * fmt_in->i_sar_den !=
 682                  fmt_out->i_sar_den * fmt_in->i_sar_num )
 683         {
 684             p_enc->fmt_in.video.i_width =
 685                 fmt_in->i_sar_num * (int64_t)fmt_out->i_sar_den * fmt_in->i_width /
 686                 fmt_in->i_sar_den / fmt_out->i_sar_num;
 687             p_enc->fmt_in.video.i_visible_width =
 688                 fmt_in->i_sar_num * (int64_t)fmt_out->i_sar_den *
 689                 fmt_in->i_visible_width / fmt_in->i_sar_den / fmt_out->i_sar_num;
 690         }
 691     }
 692
 693     p_enc->fmt_in.video.i_frame_rate = 25;
 694     p_enc->fmt_in.video.i_frame_rate_base = 1;
 695
 696     es_format_Init( &p_enc->fmt_out, VIDEO_ES, fmt_out->i_chroma );
 697     p_enc->fmt_out.video = *fmt_out;
 698     p_enc->fmt_out.video.i_width = p_enc->fmt_in.video.i_width;
 699     p_enc->fmt_out.video.i_height = p_enc->fmt_in.video.i_height;
 700
 701     /* Find a suitable decoder module */
 702     p_enc->p_module = module_need( p_enc, "encoder", NULL, false );
 703     if( !p_enc->p_module )
 704     {
 705         msg_Err( p_enc, "no suitable encoder module for fourcc `%4.4s'.\n"
 706                  "VLC probably does not support this image format.",
 707                  (char*)&p_enc->fmt_out.i_codec );
 708
 709         DeleteEncoder( p_enc );
 710         return NULL;
 711     }
 712     p_enc->fmt_in.video.i_chroma = p_enc->fmt_in.i_codec;
 713
 714     return p_enc;
 715 }
 716
 717 static void DeleteEncoder( encoder_t * p_enc )
 718 {
 719     if( p_enc->p_module ) module_unneed( p_enc, p_enc->p_module );
 720
 721     es_format_Clean( &p_enc->fmt_in );
 722     es_format_Clean( &p_enc->fmt_out );
 723
 724     vlc_object_release( p_enc );
 725     p_enc = NULL;
 726 }
 727
 728 static filter_t *CreateFilter( vlc_object_t *p_this, es_format_t *p_fmt_in,
 729                                video_format_t *p_fmt_out )
 730 {
 731     filter_t *p_filter;
 732
 733     p_filter = vlc_custom_create( p_this, sizeof(filter_t), "filter" );
 734     p_filter->owner.video.buffer_new =
 735         (picture_t *(*)(filter_t *))video_new_buffer;
 736
 737     p_filter->fmt_in = *p_fmt_in;
 738     p_filter->fmt_out = *p_fmt_in;
 739     p_filter->fmt_out.i_codec = p_fmt_out->i_chroma;
 740     p_filter->fmt_out.video = *p_fmt_out;
 741     p_filter->p_module = module_need( p_filter, "video filter2", NULL, false );
 742
 743     if( !p_filter->p_module )
 744     {
 745         msg_Dbg( p_filter, "no video filter found" );
 746         DeleteFilter( p_filter );
 747         return NULL;
 748     }
 749
 750     return p_filter;
 751 }
 752
 753 static void DeleteFilter( filter_t * p_filter )
 754 {
 755     if( p_filter->p_module ) module_unneed( p_filter, p_filter->p_module );
 756
 757     es_format_Clean( &p_filter->fmt_in );
 758     es_format_Clean( &p_filter->fmt_out );
 759
 760     vlc_object_release( p_filter );
 761 }