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_filter.h>
  43 #include <vlc_es.h>
  44 #include <vlc_image.h>
  45 #include <vlc_stream.h>
  46 #include <vlc_charset.h>
  47 #include <libvlc.h>
  48
  49 static picture_t *ImageRead( image_handler_t *, block_t *,
  50                              video_format_t *, video_format_t * );
  51 static picture_t *ImageReadUrl( image_handler_t *, const char *,
  52                                 video_format_t *, video_format_t * );
  53 static block_t *ImageWrite( image_handler_t *, picture_t *,
  54                             video_format_t *, video_format_t * );
  55 static int ImageWriteUrl( image_handler_t *, picture_t *,
  56                           video_format_t *, video_format_t *, const char * );
  57
  58 static picture_t *ImageConvert( image_handler_t *, picture_t *,
  59                                 video_format_t *, video_format_t * );
  60 static picture_t *ImageFilter( image_handler_t *, picture_t *,
  61                                video_format_t *, const char *psz_module );
  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 *, const char * );
  70 static void DeleteFilter( filter_t * );
  71
  72 static vlc_fourcc_t Ext2Fourcc( const char * );
  73 /*static const char *Fourcc2Ext( vlc_fourcc_t );*/
  74
  75 /**
  76  * Create an image_handler_t instance
  77  *
  78  */
  79 image_handler_t *__image_HandlerCreate( vlc_object_t *p_this )
  80 {
  81     image_handler_t *p_image = malloc( sizeof(image_handler_t) );
  82
  83     memset( p_image, 0, sizeof(image_handler_t) );
  84     p_image->p_parent = p_this;
  85
  86     p_image->pf_read = ImageRead;
  87     p_image->pf_read_url = ImageReadUrl;
  88     p_image->pf_write = ImageWrite;
  89     p_image->pf_write_url = ImageWriteUrl;
  90     p_image->pf_convert = ImageConvert;
  91     p_image->pf_filter = ImageFilter;
  92
  93     return p_image;
  94 }
  95
  96 /**
  97  * Delete the image_handler_t instance
  98  *
  99  */
 100 void image_HandlerDelete( image_handler_t *p_image )
 101 {
 102     if( !p_image ) return;
 103
 104     if( p_image->p_dec ) DeleteDecoder( p_image->p_dec );
 105     if( p_image->p_enc ) DeleteEncoder( p_image->p_enc );
 106     if( p_image->p_filter ) DeleteFilter( p_image->p_filter );
 107
 108     free( p_image );
 109     p_image = NULL;
 110 }
 111
 112 /**
 113  * Read an image
 114  *
 115  */
 116
 117 static picture_t *ImageRead( image_handler_t *p_image, block_t *p_block,
 118                              video_format_t *p_fmt_in,
 119                              video_format_t *p_fmt_out )
 120 {
 121     picture_t *p_pic = NULL, *p_tmp;
 122
 123     /* Check if we can reuse the current decoder */
 124     if( p_image->p_dec &&
 125         p_image->p_dec->fmt_in.i_codec != p_fmt_in->i_chroma )
 126     {
 127         DeleteDecoder( p_image->p_dec );
 128         p_image->p_dec = 0;
 129     }
 130
 131     /* Start a decoder */
 132     if( !p_image->p_dec )
 133     {
 134         p_image->p_dec = CreateDecoder( p_image->p_parent, p_fmt_in );
 135         if( !p_image->p_dec ) return NULL;
 136     }
 137
 138     p_block->i_pts = p_block->i_dts = mdate();
 139     while( (p_tmp = p_image->p_dec->pf_decode_video( p_image->p_dec, &p_block ))
 140              != NULL )
 141     {
 142         if ( p_pic != NULL )
 143             p_pic->pf_release( p_pic );
 144         p_pic = p_tmp;
 145     }
 146
 147     if( p_pic == NULL )
 148     {
 149         msg_Warn( p_image->p_parent, "no image decoded" );
 150         return 0;
 151     }
 152
 153     if( !p_fmt_out->i_chroma )
 154         p_fmt_out->i_chroma = p_image->p_dec->fmt_out.video.i_chroma;
 155     if( !p_fmt_out->i_width && p_fmt_out->i_height )
 156         p_fmt_out->i_width = p_fmt_out->i_height
 157                               * p_image->p_dec->fmt_out.video.i_aspect
 158                               / VOUT_ASPECT_FACTOR;
 159     if( !p_fmt_out->i_height && p_fmt_out->i_width )
 160         p_fmt_out->i_height = p_fmt_out->i_width * VOUT_ASPECT_FACTOR
 161                                / p_image->p_dec->fmt_out.video.i_aspect;
 162     if( !p_fmt_out->i_width )
 163         p_fmt_out->i_width = p_image->p_dec->fmt_out.video.i_width;
 164     if( !p_fmt_out->i_height )
 165         p_fmt_out->i_height = p_image->p_dec->fmt_out.video.i_height;
 166
 167     /* Check if we need chroma conversion or resizing */
 168     if( p_image->p_dec->fmt_out.video.i_chroma != p_fmt_out->i_chroma ||
 169         p_image->p_dec->fmt_out.video.i_width != p_fmt_out->i_width ||
 170         p_image->p_dec->fmt_out.video.i_height != p_fmt_out->i_height )
 171     {
 172         if( p_image->p_filter )
 173         if( p_image->p_filter->fmt_in.video.i_chroma !=
 174             p_image->p_dec->fmt_out.video.i_chroma ||
 175             p_image->p_filter->fmt_out.video.i_chroma != p_fmt_out->i_chroma )
 176         {
 177             /* We need to restart a new filter */
 178             DeleteFilter( p_image->p_filter );
 179             p_image->p_filter = 0;
 180         }
 181
 182         /* Start a filter */
 183         if( !p_image->p_filter )
 184         {
 185             p_image->p_filter =
 186                 CreateFilter( p_image->p_parent, &p_image->p_dec->fmt_out,
 187                               p_fmt_out, NULL );
 188
 189             if( !p_image->p_filter )
 190             {
 191                 p_pic->pf_release( p_pic );
 192                 return NULL;
 193             }
 194         }
 195         else
 196         {
 197             /* Filters should handle on-the-fly size changes */
 198             p_image->p_filter->fmt_in = p_image->p_dec->fmt_out;
 199             p_image->p_filter->fmt_out = p_image->p_dec->fmt_out;
 200             p_image->p_filter->fmt_out.i_codec = p_fmt_out->i_chroma;
 201             p_image->p_filter->fmt_out.video = *p_fmt_out;
 202         }
 203
 204         p_pic = p_image->p_filter->pf_video_filter( p_image->p_filter, p_pic );
 205         *p_fmt_out = p_image->p_filter->fmt_out.video;
 206     }
 207     else *p_fmt_out = p_image->p_dec->fmt_out.video;
 208
 209     return p_pic;
 210 }
 211
 212 static picture_t *ImageReadUrl( image_handler_t *p_image, const char *psz_url,
 213                                 video_format_t *p_fmt_in,
 214                                 video_format_t *p_fmt_out )
 215 {
 216     block_t *p_block;
 217     picture_t *p_pic;
 218     stream_t *p_stream = NULL;
 219     int i_size;
 220
 221     p_stream = stream_UrlNew( p_image->p_parent, psz_url );
 222
 223     if( !p_stream )
 224     {
 225         msg_Dbg( p_image->p_parent, "could not open %s for reading",
 226                  psz_url );
 227         return NULL;
 228     }
 229
 230     i_size = stream_Size( p_stream );
 231
 232     p_block = block_New( p_image->p_parent, i_size );
 233
 234     stream_Read( p_stream, p_block->p_buffer, i_size );
 235     stream_Delete( p_stream );
 236
 237     if( !p_fmt_in->i_chroma )
 238     {
 239         /* Try to guess format from file name */
 240         p_fmt_in->i_chroma = Ext2Fourcc( psz_url );
 241     }
 242
 243     p_pic = ImageRead( p_image, p_block, p_fmt_in, p_fmt_out );
 244
 245     return p_pic;
 246 }
 247
 248 /**
 249  * Write an image
 250  *
 251  */
 252
 253 static block_t *ImageWrite( image_handler_t *p_image, picture_t *p_pic,
 254                             video_format_t *p_fmt_in,
 255                             video_format_t *p_fmt_out )
 256 {
 257     block_t *p_block;
 258
 259     /* Check if we can reuse the current encoder */
 260     if( p_image->p_enc &&
 261         ( p_image->p_enc->fmt_out.i_codec != p_fmt_out->i_chroma ||
 262           p_image->p_enc->fmt_out.video.i_width != p_fmt_out->i_width ||
 263           p_image->p_enc->fmt_out.video.i_height != p_fmt_out->i_height ) )
 264     {
 265         DeleteEncoder( p_image->p_enc );
 266         p_image->p_enc = 0;
 267     }
 268
 269     /* Start an encoder */
 270     if( !p_image->p_enc )
 271     {
 272         p_image->p_enc = CreateEncoder( p_image->p_parent,
 273                                         p_fmt_in, p_fmt_out );
 274         if( !p_image->p_enc ) return NULL;
 275     }
 276
 277     /* Check if we need chroma conversion or resizing */
 278     if( p_image->p_enc->fmt_in.video.i_chroma != p_fmt_in->i_chroma ||
 279         p_image->p_enc->fmt_in.video.i_width != p_fmt_in->i_width ||
 280         p_image->p_enc->fmt_in.video.i_height != p_fmt_in->i_height )
 281     {
 282         picture_t *p_tmp_pic;
 283
 284         if( p_image->p_filter )
 285         if( p_image->p_filter->fmt_in.video.i_chroma != p_fmt_in->i_chroma ||
 286             p_image->p_filter->fmt_out.video.i_chroma !=
 287             p_image->p_enc->fmt_in.video.i_chroma )
 288         {
 289             /* We need to restart a new filter */
 290             DeleteFilter( p_image->p_filter );
 291             p_image->p_filter = 0;
 292         }
 293
 294         /* Start a filter */
 295         if( !p_image->p_filter )
 296         {
 297             es_format_t fmt_in;
 298             es_format_Init( &fmt_in, VIDEO_ES, p_fmt_in->i_chroma );
 299             fmt_in.video = *p_fmt_in;
 300
 301             p_image->p_filter =
 302                 CreateFilter( p_image->p_parent, &fmt_in,
 303                               &p_image->p_enc->fmt_in.video, NULL );
 304
 305             if( !p_image->p_filter )
 306             {
 307                 return NULL;
 308             }
 309         }
 310         else
 311         {
 312             /* Filters should handle on-the-fly size changes */
 313             p_image->p_filter->fmt_in.i_codec = p_fmt_in->i_chroma;
 314             p_image->p_filter->fmt_out.video = *p_fmt_in;
 315             p_image->p_filter->fmt_out.i_codec =p_image->p_enc->fmt_in.i_codec;
 316             p_image->p_filter->fmt_out.video = p_image->p_enc->fmt_in.video;
 317         }
 318
 319         p_pic->i_refcount++; /* pf_video_filter() will call pf_release() */
 320         p_tmp_pic =
 321             p_image->p_filter->pf_video_filter( p_image->p_filter, p_pic );
 322
 323         p_block = p_image->p_enc->pf_encode_video( p_image->p_enc, p_tmp_pic );
 324
 325         p_image->p_filter->pf_vout_buffer_del( p_image->p_filter, p_tmp_pic );
 326     }
 327     else
 328     {
 329         p_block = p_image->p_enc->pf_encode_video( p_image->p_enc, p_pic );
 330     }
 331
 332     if( !p_block )
 333     {
 334         msg_Dbg( p_image->p_parent, "no image encoded" );
 335         return 0;
 336     }
 337
 338     return p_block;
 339 }
 340
 341 static int ImageWriteUrl( image_handler_t *p_image, picture_t *p_pic,
 342                           video_format_t *p_fmt_in, video_format_t *p_fmt_out,
 343                           const char *psz_url )
 344 {
 345     block_t *p_block;
 346     FILE *file;
 347
 348     if( !p_fmt_out->i_chroma )
 349     {
 350         /* Try to guess format from file name */
 351         p_fmt_out->i_chroma = Ext2Fourcc( psz_url );
 352     }
 353
 354     file = utf8_fopen( psz_url, "wb" );
 355     if( !file )
 356     {
 357         msg_Err( p_image->p_parent, "%s: %m", psz_url );
 358         return VLC_EGENERIC;
 359     }
 360
 361     p_block = ImageWrite( p_image, p_pic, p_fmt_in, p_fmt_out );
 362
 363     int err = 0;
 364     if( p_block )
 365     {
 366         if( fwrite( p_block->p_buffer, p_block->i_buffer, 1, file ) != 1 )
 367             err = errno;
 368         block_Release( p_block );
 369     }
 370
 371     if( fclose( file ) && !err )
 372         err = errno;
 373
 374     if( err )
 375     {
 376        errno = err;
 377        msg_Err( p_image->p_parent, "%s: %m", psz_url );
 378     }
 379
 380     return err ? VLC_EGENERIC : VLC_SUCCESS;
 381 }
 382
 383 /**
 384  * Convert an image to a different format
 385  *
 386  */
 387
 388 static picture_t *ImageConvert( image_handler_t *p_image, picture_t *p_pic,
 389                                 video_format_t *p_fmt_in,
 390                                 video_format_t *p_fmt_out )
 391 {
 392     picture_t *p_pif;
 393
 394     if( !p_fmt_out->i_width && !p_fmt_out->i_height &&
 395         p_fmt_out->i_sar_num && p_fmt_out->i_sar_den &&
 396         p_fmt_out->i_sar_num * p_fmt_in->i_sar_den !=
 397         p_fmt_out->i_sar_den * p_fmt_in->i_sar_num )
 398     {
 399         p_fmt_out->i_width =
 400             p_fmt_in->i_sar_num * (int64_t)p_fmt_out->i_sar_den *
 401             p_fmt_in->i_width / p_fmt_in->i_sar_den / p_fmt_out->i_sar_num;
 402         p_fmt_out->i_visible_width =
 403             p_fmt_in->i_sar_num * (int64_t)p_fmt_out->i_sar_den *
 404             p_fmt_in->i_visible_width / p_fmt_in->i_sar_den /
 405             p_fmt_out->i_sar_num;
 406     }
 407
 408     if( !p_fmt_out->i_chroma ) p_fmt_out->i_chroma = p_fmt_in->i_chroma;
 409     if( !p_fmt_out->i_width )
 410         p_fmt_out->i_width = p_fmt_out->i_visible_width = p_fmt_in->i_width;
 411     if( !p_fmt_out->i_height )
 412         p_fmt_out->i_height = p_fmt_out->i_visible_height = p_fmt_in->i_height;
 413     if( !p_fmt_out->i_sar_num ) p_fmt_out->i_sar_num = p_fmt_in->i_sar_num;
 414     if( !p_fmt_out->i_sar_den ) p_fmt_out->i_sar_den = p_fmt_in->i_sar_den;
 415     if( !p_fmt_out->i_aspect ) p_fmt_out->i_aspect = p_fmt_in->i_aspect;
 416
 417     if( p_image->p_filter )
 418     if( p_image->p_filter->fmt_in.video.i_chroma != p_fmt_in->i_chroma ||
 419         p_image->p_filter->fmt_out.video.i_chroma != p_fmt_out->i_chroma )
 420     {
 421         /* We need to restart a new filter */
 422         DeleteFilter( p_image->p_filter );
 423         p_image->p_filter = NULL;
 424     }
 425
 426     /* Start a filter */
 427     if( !p_image->p_filter )
 428     {
 429         es_format_t fmt_in;
 430         es_format_Init( &fmt_in, VIDEO_ES, p_fmt_in->i_chroma );
 431         fmt_in.video = *p_fmt_in;
 432
 433         p_image->p_filter =
 434             CreateFilter( p_image->p_parent, &fmt_in, p_fmt_out, NULL );
 435
 436         if( !p_image->p_filter )
 437         {
 438             return NULL;
 439         }
 440     }
 441     else
 442     {
 443         /* Filters should handle on-the-fly size changes */
 444         p_image->p_filter->fmt_in.video = *p_fmt_in;
 445         p_image->p_filter->fmt_out.video = *p_fmt_out;
 446     }
 447
 448     p_pic->i_refcount++; /* pf_video_filter() will call pf_release() */
 449     p_pif = p_image->p_filter->pf_video_filter( p_image->p_filter, p_pic );
 450
 451     if( p_fmt_in->i_chroma == p_fmt_out->i_chroma &&
 452         p_fmt_in->i_width == p_fmt_out->i_width &&
 453         p_fmt_in->i_height == p_fmt_out->i_height )
 454     {
 455         /* Duplicate image */
 456         p_pif->pf_release( p_pif ); /* XXX: Better fix must be possible */
 457         p_pif = p_image->p_filter->pf_vout_buffer_new( p_image->p_filter );
 458         if( p_pif ) vout_CopyPicture( p_image->p_parent, p_pif, p_pic );
 459     }
 460
 461     return p_pif;
 462 }
 463
 464 /**
 465  * Filter an image with a psz_module filter
 466  *
 467  */
 468
 469 static picture_t *ImageFilter( image_handler_t *p_image, picture_t *p_pic,
 470                                video_format_t *p_fmt, const char *psz_module )
 471 {
 472     /* Start a filter */
 473     if( !p_image->p_filter )
 474     {
 475         es_format_t fmt;
 476         es_format_Init( &fmt, VIDEO_ES, p_fmt->i_chroma );
 477         fmt.video = *p_fmt;
 478
 479         p_image->p_filter =
 480             CreateFilter( p_image->p_parent, &fmt, &fmt.video, psz_module );
 481
 482         if( !p_image->p_filter )
 483         {
 484             return NULL;
 485         }
 486     }
 487     else
 488     {
 489         /* Filters should handle on-the-fly size changes */
 490         p_image->p_filter->fmt_in.video = *p_fmt;
 491         p_image->p_filter->fmt_out.video = *p_fmt;
 492     }
 493
 494     p_pic->i_refcount++; /* pf_video_filter() will call pf_release() */
 495     return p_image->p_filter->pf_video_filter( p_image->p_filter, p_pic );
 496 }
 497
 498 /**
 499  * Misc functions
 500  *
 501  */
 502 static struct
 503 {
 504     vlc_fourcc_t i_codec;
 505     const char *psz_ext;
 506
 507 } ext_table[] =
 508 {
 509     { VLC_FOURCC('j','p','e','g'), "jpeg" },
 510     { VLC_FOURCC('j','p','e','g'), "jpg"  },
 511     { VLC_FOURCC('l','j','p','g'), "ljpg" },
 512     { VLC_FOURCC('p','n','g',' '), "png" },
 513     { VLC_FOURCC('p','g','m',' '), "pgm" },
 514     { VLC_FOURCC('p','g','m','y'), "pgmyuv" },
 515     { VLC_FOURCC('p','b','m',' '), "pbm" },
 516     { VLC_FOURCC('p','a','m',' '), "pam" },
 517     { VLC_FOURCC('t','g','a',' '), "tga" },
 518     { VLC_FOURCC('b','m','p',' '), "bmp" },
 519     { VLC_FOURCC('p','n','m',' '), "pnm" },
 520     { VLC_FOURCC('x','p','m',' '), "xpm" },
 521     { VLC_FOURCC('x','c','f',' '), "xcf" },
 522     { VLC_FOURCC('p','c','x',' '), "pcx" },
 523     { VLC_FOURCC('g','i','f',' '), "gif" },
 524     { VLC_FOURCC('t','i','f','f'), "tif" },
 525     { VLC_FOURCC('t','i','f','f'), "tiff" },
 526     { VLC_FOURCC('l','b','m',' '), "lbm" },
 527     { 0, NULL }
 528 };
 529
 530 static vlc_fourcc_t Ext2Fourcc( const char *psz_name )
 531 {
 532     int i;
 533
 534     psz_name = strrchr( psz_name, '.' );
 535     if( !psz_name ) return 0;
 536     psz_name++;
 537
 538     for( i = 0; ext_table[i].i_codec; i++ )
 539     {
 540         int j;
 541         for( j = 0; toupper(ext_table[i].psz_ext[j]) == toupper(psz_name[j]);
 542              j++ )
 543         {
 544             if( !ext_table[i].psz_ext[j] && !psz_name[j] )
 545                 return ext_table[i].i_codec;
 546         }
 547     }
 548
 549     return 0;
 550 }
 551
 552 /*
 553 static const char *Fourcc2Ext( vlc_fourcc_t i_codec )
 554 {
 555     int i;
 556
 557     for( i = 0; ext_table[i].i_codec != 0; i++ )
 558     {
 559         if( ext_table[i].i_codec == i_codec ) return ext_table[i].psz_ext;
 560     }
 561
 562     return NULL;
 563 }
 564 */
 565
 566 static void video_release_buffer( picture_t *p_pic )
 567 {
 568     if( --p_pic->i_refcount > 0 ) return;
 569
 570     free( p_pic->p_data_orig );
 571     free( p_pic->p_sys );
 572     free( p_pic );
 573 }
 574
 575 static picture_t *video_new_buffer( decoder_t *p_dec )
 576 {
 577     picture_t *p_pic = malloc( sizeof(picture_t) );
 578
 579     p_dec->fmt_out.video.i_chroma = p_dec->fmt_out.i_codec;
 580     vout_AllocatePicture( VLC_OBJECT(p_dec), p_pic,
 581                           p_dec->fmt_out.video.i_chroma,
 582                           p_dec->fmt_out.video.i_width,
 583                           p_dec->fmt_out.video.i_height,
 584                           p_dec->fmt_out.video.i_aspect );
 585
 586     if( !p_pic->i_planes )
 587     {
 588         free( p_pic );
 589         return 0;
 590     }
 591
 592     p_pic->i_refcount = 1;
 593     p_pic->pf_release = video_release_buffer;
 594     p_pic->i_status = RESERVED_PICTURE;
 595     p_pic->p_sys = NULL;
 596
 597     return p_pic;
 598 }
 599
 600 static void video_del_buffer( decoder_t *p_dec, picture_t *p_pic )
 601 {
 602     (void)p_dec;
 603     free( p_pic->p_data_orig );
 604     free( p_pic->p_sys );
 605     free( p_pic );
 606 }
 607
 608 static void video_link_picture( decoder_t *p_dec, picture_t *p_pic )
 609 {
 610     (void)p_dec;
 611     p_pic->i_refcount++;
 612 }
 613
 614 static void video_unlink_picture( decoder_t *p_dec, picture_t *p_pic )
 615 {
 616     (void)p_dec; (void)p_pic;
 617     video_release_buffer( p_pic );
 618 }
 619
 620 static decoder_t *CreateDecoder( vlc_object_t *p_this, video_format_t *fmt )
 621 {
 622     decoder_t *p_dec;
 623
 624     p_dec = vlc_object_create( p_this, VLC_OBJECT_DECODER );
 625     if( p_dec == NULL )
 626         return NULL;
 627
 628     p_dec->p_module = NULL;
 629     es_format_Init( &p_dec->fmt_in, VIDEO_ES, fmt->i_chroma );
 630     es_format_Init( &p_dec->fmt_out, VIDEO_ES, 0 );
 631     p_dec->fmt_in.video = *fmt;
 632     p_dec->b_pace_control = true;
 633
 634     p_dec->pf_vout_buffer_new = video_new_buffer;
 635     p_dec->pf_vout_buffer_del = video_del_buffer;
 636     p_dec->pf_picture_link    = video_link_picture;
 637     p_dec->pf_picture_unlink  = video_unlink_picture;
 638
 639     vlc_object_attach( p_dec, p_this );
 640
 641     /* Find a suitable decoder module */
 642     p_dec->p_module = module_Need( p_dec, "decoder", "$codec", 0 );
 643     if( !p_dec->p_module )
 644     {
 645         msg_Err( p_dec, "no suitable decoder module for fourcc `%4.4s'.\n"
 646                  "VLC probably does not support this image format.",
 647                  (char*)&p_dec->fmt_in.i_codec );
 648
 649         DeleteDecoder( p_dec );
 650         return NULL;
 651     }
 652
 653     return p_dec;
 654 }
 655
 656 static void DeleteDecoder( decoder_t * p_dec )
 657 {
 658     vlc_object_detach( p_dec );
 659
 660     if( p_dec->p_module ) module_Unneed( p_dec, p_dec->p_module );
 661
 662     es_format_Clean( &p_dec->fmt_in );
 663     es_format_Clean( &p_dec->fmt_out );
 664
 665     vlc_object_release( p_dec );
 666     p_dec = NULL;
 667 }
 668
 669 static encoder_t *CreateEncoder( vlc_object_t *p_this, video_format_t *fmt_in,
 670                                  video_format_t *fmt_out )
 671 {
 672     encoder_t *p_enc;
 673
 674     p_enc = vlc_object_create( p_this, VLC_OBJECT_ENCODER );
 675     if( p_enc == NULL )
 676         return NULL;
 677
 678     p_enc->p_module = NULL;
 679     es_format_Init( &p_enc->fmt_in, VIDEO_ES, fmt_in->i_chroma );
 680     p_enc->fmt_in.video = *fmt_in;
 681     if( fmt_out->i_width > 0 && fmt_out->i_height > 0 )
 682     {
 683         p_enc->fmt_in.video.i_width = fmt_out->i_width;
 684         p_enc->fmt_in.video.i_height = fmt_out->i_height;
 685
 686         if( fmt_out->i_visible_width > 0 &&
 687             fmt_out->i_visible_height > 0 )
 688         {
 689             p_enc->fmt_in.video.i_visible_width = fmt_out->i_visible_width;
 690             p_enc->fmt_in.video.i_visible_height = fmt_out->i_visible_height;
 691         }
 692         else
 693         {
 694             p_enc->fmt_in.video.i_visible_width = fmt_out->i_width;
 695             p_enc->fmt_in.video.i_visible_height = fmt_out->i_height;
 696         }
 697     }
 698     else if( fmt_out->i_sar_num && fmt_out->i_sar_den &&
 699              fmt_out->i_sar_num * fmt_in->i_sar_den !=
 700              fmt_out->i_sar_den * fmt_in->i_sar_num )
 701     {
 702         p_enc->fmt_in.video.i_width =
 703             fmt_in->i_sar_num * (int64_t)fmt_out->i_sar_den * fmt_in->i_width /
 704             fmt_in->i_sar_den / fmt_out->i_sar_num;
 705         p_enc->fmt_in.video.i_visible_width =
 706             fmt_in->i_sar_num * (int64_t)fmt_out->i_sar_den *
 707             fmt_in->i_visible_width / fmt_in->i_sar_den / fmt_out->i_sar_num;
 708     }
 709
 710     p_enc->fmt_in.video.i_frame_rate = 25;
 711     p_enc->fmt_in.video.i_frame_rate_base = 1;
 712
 713     es_format_Init( &p_enc->fmt_out, VIDEO_ES, fmt_out->i_chroma );
 714     p_enc->fmt_out.video = *fmt_out;
 715     p_enc->fmt_out.video.i_width = p_enc->fmt_in.video.i_width;
 716     p_enc->fmt_out.video.i_height = p_enc->fmt_in.video.i_height;
 717
 718     vlc_object_attach( p_enc, p_this );
 719
 720     /* Find a suitable decoder module */
 721     p_enc->p_module = module_Need( p_enc, "encoder", 0, 0 );
 722     if( !p_enc->p_module )
 723     {
 724         msg_Err( p_enc, "no suitable encoder module for fourcc `%4.4s'.\n"
 725                  "VLC probably does not support this image format.",
 726                  (char*)&p_enc->fmt_out.i_codec );
 727
 728         DeleteEncoder( p_enc );
 729         return NULL;
 730     }
 731     p_enc->fmt_in.video.i_chroma = p_enc->fmt_in.i_codec;
 732
 733     return p_enc;
 734 }
 735
 736 static void DeleteEncoder( encoder_t * p_enc )
 737 {
 738     vlc_object_detach( p_enc );
 739
 740     if( p_enc->p_module ) module_Unneed( p_enc, p_enc->p_module );
 741
 742     es_format_Clean( &p_enc->fmt_in );
 743     es_format_Clean( &p_enc->fmt_out );
 744
 745     vlc_object_release( p_enc );
 746     p_enc = NULL;
 747 }
 748
 749 static filter_t *CreateFilter( vlc_object_t *p_this, es_format_t *p_fmt_in,
 750                                video_format_t *p_fmt_out,
 751                                const char *psz_module )
 752 {
 753     static const char typename[] = "filter";
 754     filter_t *p_filter;
 755
 756     p_filter = vlc_custom_create( p_this, sizeof(filter_t),
 757                                   VLC_OBJECT_GENERIC, typename );
 758     vlc_object_attach( p_filter, p_this );
 759
 760     p_filter->pf_vout_buffer_new =
 761         (picture_t *(*)(filter_t *))video_new_buffer;
 762     p_filter->pf_vout_buffer_del =
 763         (void (*)(filter_t *, picture_t *))video_del_buffer;
 764
 765     p_filter->fmt_in = *p_fmt_in;
 766     p_filter->fmt_out = *p_fmt_in;
 767     p_filter->fmt_out.i_codec = p_fmt_out->i_chroma;
 768     p_filter->fmt_out.video = *p_fmt_out;
 769     p_filter->p_module = module_Need( p_filter, "video filter2",
 770                                       psz_module, 0 );
 771
 772     if( !p_filter->p_module )
 773     {
 774         msg_Dbg( p_filter, "no video filter found" );
 775         DeleteFilter( p_filter );
 776         return NULL;
 777     }
 778
 779     return p_filter;
 780 }
 781
 782 static void DeleteFilter( filter_t * p_filter )
 783 {
 784     vlc_object_detach( p_filter );
 785
 786     if( p_filter->p_module ) module_Unneed( p_filter, p_filter->p_module );
 787
 788     es_format_Clean( &p_filter->fmt_in );
 789     es_format_Clean( &p_filter->fmt_out );
 790
 791     vlc_object_release( p_filter );
 792 }