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 <vlc_sout.h>
  49 #include <libvlc.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 static picture_t *ImageFilter( image_handler_t *, picture_t *,
  63                                video_format_t *, const char *psz_module );
  64
  65 static decoder_t *CreateDecoder( vlc_object_t *, video_format_t * );
  66 static void DeleteDecoder( decoder_t * );
  67 static encoder_t *CreateEncoder( vlc_object_t *, video_format_t *,
  68                                  video_format_t * );
  69 static void DeleteEncoder( encoder_t * );
  70 static filter_t *CreateFilter( vlc_object_t *, es_format_t *,
  71                                video_format_t *, const char * );
  72 static void DeleteFilter( filter_t * );
  73
  74 vlc_fourcc_t image_Type2Fourcc( const char * );
  75 vlc_fourcc_t image_Ext2Fourcc( const char * );
  76 /*static const char *Fourcc2Ext( vlc_fourcc_t );*/
  77
  78 /**
  79  * Create an image_handler_t instance
  80  *
  81  */
  82 image_handler_t *__image_HandlerCreate( vlc_object_t *p_this )
  83 {
  84     image_handler_t *p_image = calloc( 1, sizeof(image_handler_t) );
  85     if( !p_image )
  86         return NULL;
  87
  88     p_image->p_parent = p_this;
  89
  90     p_image->pf_read = ImageRead;
  91     p_image->pf_read_url = ImageReadUrl;
  92     p_image->pf_write = ImageWrite;
  93     p_image->pf_write_url = ImageWriteUrl;
  94     p_image->pf_convert = ImageConvert;
  95     p_image->pf_filter = ImageFilter;
  96
  97     return p_image;
  98 }
  99
 100 /**
 101  * Delete the image_handler_t instance
 102  *
 103  */
 104 void image_HandlerDelete( image_handler_t *p_image )
 105 {
 106     if( !p_image ) return;
 107
 108     if( p_image->p_dec ) DeleteDecoder( p_image->p_dec );
 109     if( p_image->p_enc ) DeleteEncoder( p_image->p_enc );
 110     if( p_image->p_filter ) DeleteFilter( p_image->p_filter );
 111
 112     free( p_image );
 113     p_image = NULL;
 114 }
 115
 116 /**
 117  * Read an image
 118  *
 119  */
 120
 121 static picture_t *ImageRead( image_handler_t *p_image, block_t *p_block,
 122                              video_format_t *p_fmt_in,
 123                              video_format_t *p_fmt_out )
 124 {
 125     picture_t *p_pic = NULL, *p_tmp;
 126
 127     /* Check if we can reuse the current decoder */
 128     if( p_image->p_dec &&
 129         p_image->p_dec->fmt_in.i_codec != p_fmt_in->i_chroma )
 130     {
 131         DeleteDecoder( p_image->p_dec );
 132         p_image->p_dec = 0;
 133     }
 134
 135     /* Start a decoder */
 136     if( !p_image->p_dec )
 137     {
 138         p_image->p_dec = CreateDecoder( p_image->p_parent, p_fmt_in );
 139         if( !p_image->p_dec ) return NULL;
 140     }
 141
 142     p_block->i_pts = p_block->i_dts = mdate();
 143     while( (p_tmp = p_image->p_dec->pf_decode_video( p_image->p_dec, &p_block ))
 144              != NULL )
 145     {
 146         if( p_pic != NULL )
 147             picture_Release( p_pic );
 148         p_pic = p_tmp;
 149     }
 150
 151     if( p_pic == NULL )
 152     {
 153         msg_Warn( p_image->p_parent, "no image decoded" );
 154         return 0;
 155     }
 156
 157     if( !p_fmt_out->i_chroma )
 158         p_fmt_out->i_chroma = p_image->p_dec->fmt_out.video.i_chroma;
 159     if( !p_fmt_out->i_width && p_fmt_out->i_height )
 160         p_fmt_out->i_width = p_fmt_out->i_height
 161                               * p_image->p_dec->fmt_out.video.i_aspect
 162                               / VOUT_ASPECT_FACTOR;
 163     if( !p_fmt_out->i_height && p_fmt_out->i_width )
 164         p_fmt_out->i_height = p_fmt_out->i_width * VOUT_ASPECT_FACTOR
 165                                / p_image->p_dec->fmt_out.video.i_aspect;
 166     if( !p_fmt_out->i_width )
 167         p_fmt_out->i_width = p_image->p_dec->fmt_out.video.i_width;
 168     if( !p_fmt_out->i_height )
 169         p_fmt_out->i_height = p_image->p_dec->fmt_out.video.i_height;
 170
 171     /* Check if we need chroma conversion or resizing */
 172     if( p_image->p_dec->fmt_out.video.i_chroma != p_fmt_out->i_chroma ||
 173         p_image->p_dec->fmt_out.video.i_width != p_fmt_out->i_width ||
 174         p_image->p_dec->fmt_out.video.i_height != p_fmt_out->i_height )
 175     {
 176         if( p_image->p_filter )
 177         if( p_image->p_filter->fmt_in.video.i_chroma !=
 178             p_image->p_dec->fmt_out.video.i_chroma ||
 179             p_image->p_filter->fmt_out.video.i_chroma != p_fmt_out->i_chroma )
 180         {
 181             /* We need to restart a new filter */
 182             DeleteFilter( p_image->p_filter );
 183             p_image->p_filter = 0;
 184         }
 185
 186         /* Start a filter */
 187         if( !p_image->p_filter )
 188         {
 189             p_image->p_filter =
 190                 CreateFilter( p_image->p_parent, &p_image->p_dec->fmt_out,
 191                               p_fmt_out, NULL );
 192
 193             if( !p_image->p_filter )
 194             {
 195                 picture_Release( p_pic );
 196                 return NULL;
 197             }
 198         }
 199         else
 200         {
 201             /* Filters should handle on-the-fly size changes */
 202             p_image->p_filter->fmt_in = p_image->p_dec->fmt_out;
 203             p_image->p_filter->fmt_out = p_image->p_dec->fmt_out;
 204             p_image->p_filter->fmt_out.i_codec = p_fmt_out->i_chroma;
 205             p_image->p_filter->fmt_out.video = *p_fmt_out;
 206         }
 207
 208         p_pic = p_image->p_filter->pf_video_filter( p_image->p_filter, p_pic );
 209         *p_fmt_out = p_image->p_filter->fmt_out.video;
 210     }
 211     else *p_fmt_out = p_image->p_dec->fmt_out.video;
 212
 213     return p_pic;
 214 }
 215
 216 static picture_t *ImageReadUrl( image_handler_t *p_image, const char *psz_url,
 217                                 video_format_t *p_fmt_in,
 218                                 video_format_t *p_fmt_out )
 219 {
 220     block_t *p_block;
 221     picture_t *p_pic;
 222     stream_t *p_stream = NULL;
 223     int i_size;
 224
 225     p_stream = stream_UrlNew( p_image->p_parent, psz_url );
 226
 227     if( !p_stream )
 228     {
 229         msg_Dbg( p_image->p_parent, "could not open %s for reading",
 230                  psz_url );
 231         return NULL;
 232     }
 233
 234     i_size = stream_Size( p_stream );
 235
 236     p_block = block_New( p_image->p_parent, i_size );
 237
 238     stream_Read( p_stream, p_block->p_buffer, i_size );
 239     stream_Delete( p_stream );
 240
 241     if( !p_fmt_in->i_chroma )
 242     {
 243         /* Try to guess format from file name */
 244         p_fmt_in->i_chroma = image_Ext2Fourcc( psz_url );
 245     }
 246
 247     p_pic = ImageRead( p_image, p_block, p_fmt_in, p_fmt_out );
 248
 249     return p_pic;
 250 }
 251
 252 /**
 253  * Write an image
 254  *
 255  */
 256
 257 static block_t *ImageWrite( image_handler_t *p_image, picture_t *p_pic,
 258                             video_format_t *p_fmt_in,
 259                             video_format_t *p_fmt_out )
 260 {
 261     block_t *p_block;
 262
 263     /* Check if we can reuse the current encoder */
 264     if( p_image->p_enc &&
 265         ( p_image->p_enc->fmt_out.i_codec != p_fmt_out->i_chroma ||
 266           p_image->p_enc->fmt_out.video.i_width != p_fmt_out->i_width ||
 267           p_image->p_enc->fmt_out.video.i_height != p_fmt_out->i_height ) )
 268     {
 269         DeleteEncoder( p_image->p_enc );
 270         p_image->p_enc = 0;
 271     }
 272
 273     /* Start an encoder */
 274     if( !p_image->p_enc )
 275     {
 276         p_image->p_enc = CreateEncoder( p_image->p_parent,
 277                                         p_fmt_in, p_fmt_out );
 278         if( !p_image->p_enc ) return NULL;
 279     }
 280
 281     /* Check if we need chroma conversion or resizing */
 282     if( p_image->p_enc->fmt_in.video.i_chroma != p_fmt_in->i_chroma ||
 283         p_image->p_enc->fmt_in.video.i_width != p_fmt_in->i_width ||
 284         p_image->p_enc->fmt_in.video.i_height != p_fmt_in->i_height )
 285     {
 286         picture_t *p_tmp_pic;
 287
 288         if( p_image->p_filter )
 289         if( p_image->p_filter->fmt_in.video.i_chroma != p_fmt_in->i_chroma ||
 290             p_image->p_filter->fmt_out.video.i_chroma !=
 291             p_image->p_enc->fmt_in.video.i_chroma )
 292         {
 293             /* We need to restart a new filter */
 294             DeleteFilter( p_image->p_filter );
 295             p_image->p_filter = 0;
 296         }
 297
 298         /* Start a filter */
 299         if( !p_image->p_filter )
 300         {
 301             es_format_t fmt_in;
 302             es_format_Init( &fmt_in, VIDEO_ES, p_fmt_in->i_chroma );
 303             fmt_in.video = *p_fmt_in;
 304
 305             p_image->p_filter =
 306                 CreateFilter( p_image->p_parent, &fmt_in,
 307                               &p_image->p_enc->fmt_in.video, NULL );
 308
 309             if( !p_image->p_filter )
 310             {
 311                 return NULL;
 312             }
 313         }
 314         else
 315         {
 316             /* Filters should handle on-the-fly size changes */
 317             p_image->p_filter->fmt_in.i_codec = p_fmt_in->i_chroma;
 318             p_image->p_filter->fmt_out.video = *p_fmt_in;
 319             p_image->p_filter->fmt_out.i_codec =p_image->p_enc->fmt_in.i_codec;
 320             p_image->p_filter->fmt_out.video = p_image->p_enc->fmt_in.video;
 321         }
 322
 323         picture_Hold( p_pic );
 324
 325         p_tmp_pic =
 326             p_image->p_filter->pf_video_filter( p_image->p_filter, p_pic );
 327
 328         p_block = p_image->p_enc->pf_encode_video( p_image->p_enc, p_tmp_pic );
 329
 330         p_image->p_filter->pf_vout_buffer_del( p_image->p_filter, p_tmp_pic );
 331     }
 332     else
 333     {
 334         p_block = p_image->p_enc->pf_encode_video( p_image->p_enc, p_pic );
 335     }
 336
 337     if( !p_block )
 338     {
 339         msg_Dbg( p_image->p_parent, "no image encoded" );
 340         return 0;
 341     }
 342
 343     return p_block;
 344 }
 345
 346 static int ImageWriteUrl( image_handler_t *p_image, picture_t *p_pic,
 347                           video_format_t *p_fmt_in, video_format_t *p_fmt_out,
 348                           const char *psz_url )
 349 {
 350     block_t *p_block;
 351     FILE *file;
 352
 353     if( !p_fmt_out->i_chroma )
 354     {
 355         /* Try to guess format from file name */
 356         p_fmt_out->i_chroma = image_Ext2Fourcc( psz_url );
 357     }
 358
 359     file = utf8_fopen( psz_url, "wb" );
 360     if( !file )
 361     {
 362         msg_Err( p_image->p_parent, "%s: %m", psz_url );
 363         return VLC_EGENERIC;
 364     }
 365
 366     p_block = ImageWrite( p_image, p_pic, p_fmt_in, p_fmt_out );
 367
 368     int err = 0;
 369     if( p_block )
 370     {
 371         if( fwrite( p_block->p_buffer, p_block->i_buffer, 1, file ) != 1 )
 372             err = errno;
 373         block_Release( p_block );
 374     }
 375
 376     if( fclose( file ) && !err )
 377         err = errno;
 378
 379     if( err )
 380     {
 381        errno = err;
 382        msg_Err( p_image->p_parent, "%s: %m", psz_url );
 383     }
 384
 385     return err ? VLC_EGENERIC : VLC_SUCCESS;
 386 }
 387
 388 /**
 389  * Convert an image to a different format
 390  *
 391  */
 392
 393 static picture_t *ImageConvert( image_handler_t *p_image, picture_t *p_pic,
 394                                 video_format_t *p_fmt_in,
 395                                 video_format_t *p_fmt_out )
 396 {
 397     picture_t *p_pif;
 398
 399     if( !p_fmt_out->i_width && !p_fmt_out->i_height &&
 400         p_fmt_out->i_sar_num && p_fmt_out->i_sar_den &&
 401         p_fmt_out->i_sar_num * p_fmt_in->i_sar_den !=
 402         p_fmt_out->i_sar_den * p_fmt_in->i_sar_num )
 403     {
 404         p_fmt_out->i_width =
 405             p_fmt_in->i_sar_num * (int64_t)p_fmt_out->i_sar_den *
 406             p_fmt_in->i_width / p_fmt_in->i_sar_den / p_fmt_out->i_sar_num;
 407         p_fmt_out->i_visible_width =
 408             p_fmt_in->i_sar_num * (int64_t)p_fmt_out->i_sar_den *
 409             p_fmt_in->i_visible_width / p_fmt_in->i_sar_den /
 410             p_fmt_out->i_sar_num;
 411     }
 412
 413     if( !p_fmt_out->i_chroma ) p_fmt_out->i_chroma = p_fmt_in->i_chroma;
 414     if( !p_fmt_out->i_width )
 415         p_fmt_out->i_width = p_fmt_out->i_visible_width = p_fmt_in->i_width;
 416     if( !p_fmt_out->i_height )
 417         p_fmt_out->i_height = p_fmt_out->i_visible_height = p_fmt_in->i_height;
 418     if( !p_fmt_out->i_sar_num ) p_fmt_out->i_sar_num = p_fmt_in->i_sar_num;
 419     if( !p_fmt_out->i_sar_den ) p_fmt_out->i_sar_den = p_fmt_in->i_sar_den;
 420     if( !p_fmt_out->i_aspect ) p_fmt_out->i_aspect = p_fmt_in->i_aspect;
 421
 422     if( p_image->p_filter )
 423     if( p_image->p_filter->fmt_in.video.i_chroma != p_fmt_in->i_chroma ||
 424         p_image->p_filter->fmt_out.video.i_chroma != p_fmt_out->i_chroma )
 425     {
 426         /* We need to restart a new filter */
 427         DeleteFilter( p_image->p_filter );
 428         p_image->p_filter = NULL;
 429     }
 430
 431     /* Start a filter */
 432     if( !p_image->p_filter )
 433     {
 434         es_format_t fmt_in;
 435         es_format_Init( &fmt_in, VIDEO_ES, p_fmt_in->i_chroma );
 436         fmt_in.video = *p_fmt_in;
 437
 438         p_image->p_filter =
 439             CreateFilter( p_image->p_parent, &fmt_in, p_fmt_out, NULL );
 440
 441         if( !p_image->p_filter )
 442         {
 443             return NULL;
 444         }
 445     }
 446     else
 447     {
 448         /* Filters should handle on-the-fly size changes */
 449         p_image->p_filter->fmt_in.video = *p_fmt_in;
 450         p_image->p_filter->fmt_out.video = *p_fmt_out;
 451     }
 452
 453     picture_Hold( p_pic );
 454
 455     p_pif = p_image->p_filter->pf_video_filter( p_image->p_filter, p_pic );
 456
 457     if( p_fmt_in->i_chroma == p_fmt_out->i_chroma &&
 458         p_fmt_in->i_width == p_fmt_out->i_width &&
 459         p_fmt_in->i_height == p_fmt_out->i_height )
 460     {
 461         /* Duplicate image */
 462         picture_Release( p_pif ); /* XXX: Better fix must be possible */
 463         p_pif = p_image->p_filter->pf_vout_buffer_new( p_image->p_filter );
 464         if( p_pif )
 465             picture_Copy( p_pif, p_pic );
 466     }
 467
 468     return p_pif;
 469 }
 470
 471 /**
 472  * Filter an image with a psz_module filter
 473  *
 474  */
 475
 476 static picture_t *ImageFilter( image_handler_t *p_image, picture_t *p_pic,
 477                                video_format_t *p_fmt, const char *psz_module )
 478 {
 479     /* Start a filter */
 480     if( !p_image->p_filter )
 481     {
 482         es_format_t fmt;
 483         es_format_Init( &fmt, VIDEO_ES, p_fmt->i_chroma );
 484         fmt.video = *p_fmt;
 485
 486         p_image->p_filter =
 487             CreateFilter( p_image->p_parent, &fmt, &fmt.video, psz_module );
 488
 489         if( !p_image->p_filter )
 490         {
 491             return NULL;
 492         }
 493     }
 494     else
 495     {
 496         /* Filters should handle on-the-fly size changes */
 497         p_image->p_filter->fmt_in.video = *p_fmt;
 498         p_image->p_filter->fmt_out.video = *p_fmt;
 499     }
 500
 501     picture_Hold( p_pic );
 502
 503     return p_image->p_filter->pf_video_filter( p_image->p_filter, p_pic );
 504 }
 505
 506 /**
 507  * Misc functions
 508  *
 509  */
 510 static const struct
 511 {
 512     vlc_fourcc_t i_codec;
 513     const char *psz_ext;
 514
 515 } ext_table[] =
 516 {
 517     { VLC_FOURCC('j','p','e','g'), "jpeg" },
 518     { VLC_FOURCC('j','p','e','g'), "jpg"  },
 519     { VLC_FOURCC('l','j','p','g'), "ljpg" },
 520     { VLC_FOURCC('p','n','g',' '), "png" },
 521     { VLC_FOURCC('p','g','m',' '), "pgm" },
 522     { VLC_FOURCC('p','g','m','y'), "pgmyuv" },
 523     { VLC_FOURCC('p','b','m',' '), "pbm" },
 524     { VLC_FOURCC('p','a','m',' '), "pam" },
 525     { VLC_FOURCC('t','g','a',' '), "tga" },
 526     { VLC_FOURCC('b','m','p',' '), "bmp" },
 527     { VLC_FOURCC('p','n','m',' '), "pnm" },
 528     { VLC_FOURCC('x','p','m',' '), "xpm" },
 529     { VLC_FOURCC('x','c','f',' '), "xcf" },
 530     { VLC_FOURCC('p','c','x',' '), "pcx" },
 531     { VLC_FOURCC('g','i','f',' '), "gif" },
 532     { VLC_FOURCC('t','i','f','f'), "tif" },
 533     { VLC_FOURCC('t','i','f','f'), "tiff" },
 534     { VLC_FOURCC('l','b','m',' '), "lbm" },
 535     { 0, NULL }
 536 };
 537
 538 vlc_fourcc_t image_Type2Fourcc( const char *psz_type )
 539 {
 540     int i;
 541
 542     for( i = 0; ext_table[i].i_codec; i++ )
 543     {
 544         int j;
 545         for( j = 0; toupper(ext_table[i].psz_ext[j]) == toupper(psz_type[j]);
 546              j++ )
 547         {
 548             if( !ext_table[i].psz_ext[j] && !psz_type[j] )
 549                 return ext_table[i].i_codec;
 550         }
 551     }
 552
 553     return 0;
 554 }
 555
 556 vlc_fourcc_t image_Ext2Fourcc( const char *psz_name )
 557 {
 558     psz_name = strrchr( psz_name, '.' );
 559     if( !psz_name ) return 0;
 560     psz_name++;
 561
 562     return image_Type2Fourcc( psz_name );
 563 }
 564
 565 /*
 566 static const char *Fourcc2Ext( vlc_fourcc_t i_codec )
 567 {
 568     int i;
 569
 570     for( i = 0; ext_table[i].i_codec != 0; i++ )
 571     {
 572         if( ext_table[i].i_codec == i_codec ) return ext_table[i].psz_ext;
 573     }
 574
 575     return NULL;
 576 }
 577 */
 578
 579 static picture_t *video_new_buffer( decoder_t *p_dec )
 580 {
 581     p_dec->fmt_out.video.i_chroma = p_dec->fmt_out.i_codec;
 582     return picture_New( p_dec->fmt_out.video.i_chroma,
 583                         p_dec->fmt_out.video.i_width,
 584                         p_dec->fmt_out.video.i_height,
 585                         p_dec->fmt_out.video.i_aspect );
 586 }
 587
 588 static void video_del_buffer( decoder_t *p_dec, picture_t *p_pic )
 589 {
 590     if( p_pic->i_refcount != 1 )
 591         msg_Err( p_dec, "invalid picture reference count" );
 592
 593     p_pic->i_refcount = 0;
 594     picture_Delete( p_pic );
 595 }
 596
 597 static void video_link_picture( decoder_t *p_dec, picture_t *p_pic )
 598 {
 599     (void)p_dec;
 600     picture_Hold( p_pic );
 601 }
 602
 603 static void video_unlink_picture( decoder_t *p_dec, picture_t *p_pic )
 604 {
 605     (void)p_dec;
 606     picture_Release( p_pic );
 607 }
 608
 609 static decoder_t *CreateDecoder( vlc_object_t *p_this, video_format_t *fmt )
 610 {
 611     decoder_t *p_dec;
 612
 613     p_dec = vlc_object_create( p_this, VLC_OBJECT_DECODER );
 614     if( p_dec == NULL )
 615         return NULL;
 616
 617     p_dec->p_module = NULL;
 618     es_format_Init( &p_dec->fmt_in, VIDEO_ES, fmt->i_chroma );
 619     es_format_Init( &p_dec->fmt_out, VIDEO_ES, 0 );
 620     p_dec->fmt_in.video = *fmt;
 621     p_dec->b_pace_control = true;
 622
 623     p_dec->pf_vout_buffer_new = video_new_buffer;
 624     p_dec->pf_vout_buffer_del = video_del_buffer;
 625     p_dec->pf_picture_link    = video_link_picture;
 626     p_dec->pf_picture_unlink  = video_unlink_picture;
 627
 628     vlc_object_attach( p_dec, p_this );
 629
 630     /* Find a suitable decoder module */
 631     p_dec->p_module = module_need( p_dec, "decoder", "$codec", false );
 632     if( !p_dec->p_module )
 633     {
 634         msg_Err( p_dec, "no suitable decoder module for fourcc `%4.4s'.\n"
 635                  "VLC probably does not support this image format.",
 636                  (char*)&p_dec->fmt_in.i_codec );
 637
 638         DeleteDecoder( p_dec );
 639         return NULL;
 640     }
 641
 642     return p_dec;
 643 }
 644
 645 static void DeleteDecoder( decoder_t * p_dec )
 646 {
 647     vlc_object_detach( p_dec );
 648
 649     if( p_dec->p_module ) module_unneed( p_dec, p_dec->p_module );
 650
 651     es_format_Clean( &p_dec->fmt_in );
 652     es_format_Clean( &p_dec->fmt_out );
 653
 654     if( p_dec->p_description )
 655         vlc_meta_Delete( p_dec->p_description );
 656
 657     vlc_object_release( p_dec );
 658     p_dec = NULL;
 659 }
 660
 661 static encoder_t *CreateEncoder( vlc_object_t *p_this, video_format_t *fmt_in,
 662                                  video_format_t *fmt_out )
 663 {
 664     encoder_t *p_enc;
 665
 666     p_enc = sout_EncoderCreate( p_this );
 667     if( p_enc == NULL )
 668         return NULL;
 669
 670     p_enc->p_module = NULL;
 671     es_format_Init( &p_enc->fmt_in, VIDEO_ES, fmt_in->i_chroma );
 672     p_enc->fmt_in.video = *fmt_in;
 673     if( fmt_out->i_width > 0 && fmt_out->i_height > 0 )
 674     {
 675         p_enc->fmt_in.video.i_width = fmt_out->i_width;
 676         p_enc->fmt_in.video.i_height = fmt_out->i_height;
 677
 678         if( fmt_out->i_visible_width > 0 &&
 679             fmt_out->i_visible_height > 0 )
 680         {
 681             p_enc->fmt_in.video.i_visible_width = fmt_out->i_visible_width;
 682             p_enc->fmt_in.video.i_visible_height = fmt_out->i_visible_height;
 683         }
 684         else
 685         {
 686             p_enc->fmt_in.video.i_visible_width = fmt_out->i_width;
 687             p_enc->fmt_in.video.i_visible_height = fmt_out->i_height;
 688         }
 689     }
 690     else if( fmt_out->i_sar_num && fmt_out->i_sar_den &&
 691              fmt_out->i_sar_num * fmt_in->i_sar_den !=
 692              fmt_out->i_sar_den * fmt_in->i_sar_num )
 693     {
 694         p_enc->fmt_in.video.i_width =
 695             fmt_in->i_sar_num * (int64_t)fmt_out->i_sar_den * fmt_in->i_width /
 696             fmt_in->i_sar_den / fmt_out->i_sar_num;
 697         p_enc->fmt_in.video.i_visible_width =
 698             fmt_in->i_sar_num * (int64_t)fmt_out->i_sar_den *
 699             fmt_in->i_visible_width / fmt_in->i_sar_den / fmt_out->i_sar_num;
 700     }
 701
 702     p_enc->fmt_in.video.i_frame_rate = 25;
 703     p_enc->fmt_in.video.i_frame_rate_base = 1;
 704
 705     es_format_Init( &p_enc->fmt_out, VIDEO_ES, fmt_out->i_chroma );
 706     p_enc->fmt_out.video = *fmt_out;
 707     p_enc->fmt_out.video.i_width = p_enc->fmt_in.video.i_width;
 708     p_enc->fmt_out.video.i_height = p_enc->fmt_in.video.i_height;
 709
 710     vlc_object_attach( p_enc, p_this );
 711
 712     /* Find a suitable decoder module */
 713     p_enc->p_module = module_need( p_enc, "encoder", NULL, false );
 714     if( !p_enc->p_module )
 715     {
 716         msg_Err( p_enc, "no suitable encoder module for fourcc `%4.4s'.\n"
 717                  "VLC probably does not support this image format.",
 718                  (char*)&p_enc->fmt_out.i_codec );
 719
 720         DeleteEncoder( p_enc );
 721         return NULL;
 722     }
 723     p_enc->fmt_in.video.i_chroma = p_enc->fmt_in.i_codec;
 724
 725     return p_enc;
 726 }
 727
 728 static void DeleteEncoder( encoder_t * p_enc )
 729 {
 730     vlc_object_detach( p_enc );
 731
 732     if( p_enc->p_module ) module_unneed( p_enc, p_enc->p_module );
 733
 734     es_format_Clean( &p_enc->fmt_in );
 735     es_format_Clean( &p_enc->fmt_out );
 736
 737     vlc_object_release( p_enc );
 738     p_enc = NULL;
 739 }
 740
 741 static filter_t *CreateFilter( vlc_object_t *p_this, es_format_t *p_fmt_in,
 742                                video_format_t *p_fmt_out,
 743                                const char *psz_module )
 744 {
 745     static const char typename[] = "filter";
 746     filter_t *p_filter;
 747
 748     p_filter = vlc_custom_create( p_this, sizeof(filter_t),
 749                                   VLC_OBJECT_GENERIC, typename );
 750     vlc_object_attach( p_filter, p_this );
 751
 752     p_filter->pf_vout_buffer_new =
 753         (picture_t *(*)(filter_t *))video_new_buffer;
 754     p_filter->pf_vout_buffer_del =
 755         (void (*)(filter_t *, picture_t *))video_del_buffer;
 756
 757     p_filter->fmt_in = *p_fmt_in;
 758     p_filter->fmt_out = *p_fmt_in;
 759     p_filter->fmt_out.i_codec = p_fmt_out->i_chroma;
 760     p_filter->fmt_out.video = *p_fmt_out;
 761     p_filter->p_module = module_need( p_filter, "video filter2",
 762                                       psz_module, false );
 763
 764     if( !p_filter->p_module )
 765     {
 766         msg_Dbg( p_filter, "no video filter found" );
 767         DeleteFilter( p_filter );
 768         return NULL;
 769     }
 770
 771     return p_filter;
 772 }
 773
 774 static void DeleteFilter( filter_t * p_filter )
 775 {
 776     vlc_object_detach( p_filter );
 777
 778     if( p_filter->p_module ) module_unneed( p_filter, p_filter->p_module );
 779
 780     es_format_Clean( &p_filter->fmt_in );
 781     es_format_Clean( &p_filter->fmt_out );
 782
 783     vlc_object_release( p_filter );
 784 }