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 #include <ctype.h>
  33 #include <errno.h>
  34 #include <vlc/vlc.h>
  35 #include <vlc_codec.h>
  36 #include <vlc_filter.h>
  37 #include <vlc_es.h>
  38 #include <vlc_image.h>
  39 #include <vlc_stream.h>
  40 #include <vlc_charset.h>
  41
  42 static picture_t *ImageRead( image_handler_t *, block_t *,
  43                              video_format_t *, video_format_t * );
  44 static picture_t *ImageReadUrl( image_handler_t *, const char *,
  45                                 video_format_t *, video_format_t * );
  46 static block_t *ImageWrite( image_handler_t *, picture_t *,
  47                             video_format_t *, video_format_t * );
  48 static int ImageWriteUrl( image_handler_t *, picture_t *,
  49                           video_format_t *, video_format_t *, const char * );
  50
  51 static picture_t *ImageConvert( image_handler_t *, picture_t *,
  52                                 video_format_t *, video_format_t * );
  53 static picture_t *ImageFilter( image_handler_t *, picture_t *,
  54                                video_format_t *, const char *psz_module );
  55
  56 static decoder_t *CreateDecoder( vlc_object_t *, video_format_t * );
  57 static void DeleteDecoder( decoder_t * );
  58 static encoder_t *CreateEncoder( vlc_object_t *, video_format_t *,
  59                                  video_format_t * );
  60 static void DeleteEncoder( encoder_t * );
  61 static filter_t *CreateFilter( vlc_object_t *, es_format_t *,
  62                                video_format_t *, const char * );
  63 static void DeleteFilter( filter_t * );
  64
  65 static vlc_fourcc_t Ext2Fourcc( const char * );
  66 /*static const char *Fourcc2Ext( vlc_fourcc_t );*/
  67
  68 /**
  69  * Create an image_handler_t instance
  70  *
  71  */
  72 image_handler_t *__image_HandlerCreate( vlc_object_t *p_this )
  73 {
  74     image_handler_t *p_image = malloc( sizeof(image_handler_t) );
  75
  76     memset( p_image, 0, sizeof(image_handler_t) );
  77     p_image->p_parent = p_this;
  78
  79     p_image->pf_read = ImageRead;
  80     p_image->pf_read_url = ImageReadUrl;
  81     p_image->pf_write = ImageWrite;
  82     p_image->pf_write_url = ImageWriteUrl;
  83     p_image->pf_convert = ImageConvert;
  84     p_image->pf_filter = ImageFilter;
  85
  86     return p_image;
  87 }
  88
  89 /**
  90  * Delete the image_handler_t instance
  91  *
  92  */
  93 void image_HandlerDelete( image_handler_t *p_image )
  94 {
  95     if( !p_image ) return;
  96
  97     if( p_image->p_dec ) DeleteDecoder( p_image->p_dec );
  98     if( p_image->p_enc ) DeleteEncoder( p_image->p_enc );
  99     if( p_image->p_filter ) DeleteFilter( p_image->p_filter );
 100
 101     free( p_image );
 102     p_image = NULL;
 103 }
 104
 105 /**
 106  * Read an image
 107  *
 108  */
 109
 110 static picture_t *ImageRead( image_handler_t *p_image, block_t *p_block,
 111                              video_format_t *p_fmt_in,
 112                              video_format_t *p_fmt_out )
 113 {
 114     picture_t *p_pic = NULL, *p_tmp;
 115
 116     /* Check if we can reuse the current decoder */
 117     if( p_image->p_dec &&
 118         p_image->p_dec->fmt_in.i_codec != p_fmt_in->i_chroma )
 119     {
 120         DeleteDecoder( p_image->p_dec );
 121         p_image->p_dec = 0;
 122     }
 123
 124     /* Start a decoder */
 125     if( !p_image->p_dec )
 126     {
 127         p_image->p_dec = CreateDecoder( p_image->p_parent, p_fmt_in );
 128         if( !p_image->p_dec ) return NULL;
 129     }
 130
 131     p_block->i_pts = p_block->i_dts = mdate();
 132     while( (p_tmp = p_image->p_dec->pf_decode_video( p_image->p_dec, &p_block ))
 133              != NULL )
 134     {
 135         if ( p_pic != NULL )
 136             p_pic->pf_release( p_pic );
 137         p_pic = p_tmp;
 138     }
 139
 140     if( p_pic == NULL )
 141     {
 142         msg_Warn( p_image->p_parent, "no image decoded" );
 143         return 0;
 144     }
 145
 146     if( !p_fmt_out->i_chroma )
 147         p_fmt_out->i_chroma = p_image->p_dec->fmt_out.video.i_chroma;
 148     if( !p_fmt_out->i_width && p_fmt_out->i_height )
 149         p_fmt_out->i_width = p_fmt_out->i_height
 150                               * p_image->p_dec->fmt_out.video.i_aspect
 151                               / VOUT_ASPECT_FACTOR;
 152     if( !p_fmt_out->i_height && p_fmt_out->i_width )
 153         p_fmt_out->i_height = p_fmt_out->i_width * VOUT_ASPECT_FACTOR
 154                                / p_image->p_dec->fmt_out.video.i_aspect;
 155     if( !p_fmt_out->i_width )
 156         p_fmt_out->i_width = p_image->p_dec->fmt_out.video.i_width;
 157     if( !p_fmt_out->i_height )
 158         p_fmt_out->i_height = p_image->p_dec->fmt_out.video.i_height;
 159
 160     /* Check if we need chroma conversion or resizing */
 161     if( p_image->p_dec->fmt_out.video.i_chroma != p_fmt_out->i_chroma ||
 162         p_image->p_dec->fmt_out.video.i_width != p_fmt_out->i_width ||
 163         p_image->p_dec->fmt_out.video.i_height != p_fmt_out->i_height )
 164     {
 165         if( p_image->p_filter )
 166         if( p_image->p_filter->fmt_in.video.i_chroma !=
 167             p_image->p_dec->fmt_out.video.i_chroma ||
 168             p_image->p_filter->fmt_out.video.i_chroma != p_fmt_out->i_chroma )
 169         {
 170             /* We need to restart a new filter */
 171             DeleteFilter( p_image->p_filter );
 172             p_image->p_filter = 0;
 173         }
 174
 175         /* Start a filter */
 176         if( !p_image->p_filter )
 177         {
 178             p_image->p_filter =
 179                 CreateFilter( p_image->p_parent, &p_image->p_dec->fmt_out,
 180                               p_fmt_out, NULL );
 181
 182             if( !p_image->p_filter )
 183             {
 184                 p_pic->pf_release( p_pic );
 185                 return NULL;
 186             }
 187         }
 188         else
 189         {
 190             /* Filters should handle on-the-fly size changes */
 191             p_image->p_filter->fmt_in = p_image->p_dec->fmt_out;
 192             p_image->p_filter->fmt_out = p_image->p_dec->fmt_out;
 193             p_image->p_filter->fmt_out.i_codec = p_fmt_out->i_chroma;
 194             p_image->p_filter->fmt_out.video = *p_fmt_out;
 195         }
 196
 197         p_pic = p_image->p_filter->pf_video_filter( p_image->p_filter, p_pic );
 198         *p_fmt_out = p_image->p_filter->fmt_out.video;
 199     }
 200     else *p_fmt_out = p_image->p_dec->fmt_out.video;
 201
 202     return p_pic;
 203 }
 204
 205 static picture_t *ImageReadUrl( image_handler_t *p_image, const char *psz_url,
 206                                 video_format_t *p_fmt_in,
 207                                 video_format_t *p_fmt_out )
 208 {
 209     block_t *p_block;
 210     picture_t *p_pic;
 211     stream_t *p_stream = NULL;
 212     int i_size;
 213
 214     p_stream = stream_UrlNew( p_image->p_parent, psz_url );
 215
 216     if( !p_stream )
 217     {
 218         msg_Dbg( p_image->p_parent, "could not open %s for reading",
 219                  psz_url );
 220         return NULL;
 221     }
 222
 223     i_size = stream_Size( p_stream );
 224
 225     p_block = block_New( p_image->p_parent, i_size );
 226
 227     stream_Read( p_stream, p_block->p_buffer, i_size );
 228     stream_Delete( p_stream );
 229
 230     if( !p_fmt_in->i_chroma )
 231     {
 232         /* Try to guess format from file name */
 233         p_fmt_in->i_chroma = Ext2Fourcc( psz_url );
 234     }
 235
 236     p_pic = ImageRead( p_image, p_block, p_fmt_in, p_fmt_out );
 237
 238     return p_pic;
 239 }
 240
 241 /**
 242  * Write an image
 243  *
 244  */
 245
 246 static void PicRelease( picture_t *p_pic ) { (void)p_pic; }
 247
 248 static block_t *ImageWrite( image_handler_t *p_image, picture_t *p_pic,
 249                             video_format_t *p_fmt_in,
 250                             video_format_t *p_fmt_out )
 251 {
 252     block_t *p_block;
 253     void (*pf_release)( picture_t * );
 254
 255     /* Check if we can reuse the current encoder */
 256     if( p_image->p_enc &&
 257         ( p_image->p_enc->fmt_out.i_codec != p_fmt_out->i_chroma ||
 258           p_image->p_enc->fmt_out.video.i_width != p_fmt_out->i_width ||
 259           p_image->p_enc->fmt_out.video.i_height != p_fmt_out->i_height ) )
 260     {
 261         DeleteEncoder( p_image->p_enc );
 262         p_image->p_enc = 0;
 263     }
 264
 265     /* Start an encoder */
 266     if( !p_image->p_enc )
 267     {
 268         p_image->p_enc = CreateEncoder( p_image->p_parent,
 269                                         p_fmt_in, p_fmt_out );
 270         if( !p_image->p_enc ) return NULL;
 271     }
 272
 273     /* Check if we need chroma conversion or resizing */
 274     if( p_image->p_enc->fmt_in.video.i_chroma != p_fmt_in->i_chroma ||
 275         p_image->p_enc->fmt_in.video.i_width != p_fmt_in->i_width ||
 276         p_image->p_enc->fmt_in.video.i_height != p_fmt_in->i_height )
 277     {
 278         picture_t *p_tmp_pic;
 279
 280         if( p_image->p_filter )
 281         if( p_image->p_filter->fmt_in.video.i_chroma != p_fmt_in->i_chroma ||
 282             p_image->p_filter->fmt_out.video.i_chroma !=
 283             p_image->p_enc->fmt_in.video.i_chroma )
 284         {
 285             /* We need to restart a new filter */
 286             DeleteFilter( p_image->p_filter );
 287             p_image->p_filter = 0;
 288         }
 289
 290         /* Start a filter */
 291         if( !p_image->p_filter )
 292         {
 293             es_format_t fmt_in;
 294             es_format_Init( &fmt_in, VIDEO_ES, p_fmt_in->i_chroma );
 295             fmt_in.video = *p_fmt_in;
 296
 297             p_image->p_filter =
 298                 CreateFilter( p_image->p_parent, &fmt_in,
 299                               &p_image->p_enc->fmt_in.video, NULL );
 300
 301             if( !p_image->p_filter )
 302             {
 303                 return NULL;
 304             }
 305         }
 306         else
 307         {
 308             /* Filters should handle on-the-fly size changes */
 309             p_image->p_filter->fmt_in.i_codec = p_fmt_in->i_chroma;
 310             p_image->p_filter->fmt_out.video = *p_fmt_in;
 311             p_image->p_filter->fmt_out.i_codec =p_image->p_enc->fmt_in.i_codec;
 312             p_image->p_filter->fmt_out.video = p_image->p_enc->fmt_in.video;
 313         }
 314
 315         pf_release = p_pic->pf_release;
 316         p_pic->pf_release = PicRelease; /* Small hack */
 317         p_tmp_pic =
 318             p_image->p_filter->pf_video_filter( p_image->p_filter, p_pic );
 319         p_pic->pf_release = pf_release;
 320
 321         p_block = p_image->p_enc->pf_encode_video( p_image->p_enc, p_tmp_pic );
 322
 323         p_image->p_filter->pf_vout_buffer_del( p_image->p_filter, p_tmp_pic );
 324     }
 325     else
 326     {
 327         p_block = p_image->p_enc->pf_encode_video( p_image->p_enc, p_pic );
 328     }
 329
 330     if( !p_block )
 331     {
 332         msg_Dbg( p_image->p_parent, "no image encoded" );
 333         return 0;
 334     }
 335
 336     return p_block;
 337 }
 338
 339 static int ImageWriteUrl( image_handler_t *p_image, picture_t *p_pic,
 340                           video_format_t *p_fmt_in, video_format_t *p_fmt_out,
 341                           const char *psz_url )
 342 {
 343     block_t *p_block;
 344     FILE *file;
 345
 346     if( !p_fmt_out->i_chroma )
 347     {
 348         /* Try to guess format from file name */
 349         p_fmt_out->i_chroma = Ext2Fourcc( psz_url );
 350     }
 351
 352     file = utf8_fopen( psz_url, "wb" );
 353     if( !file )
 354     {
 355         msg_Err( p_image->p_parent, "%s: %m", psz_url );
 356         return VLC_EGENERIC;
 357     }
 358
 359     p_block = ImageWrite( p_image, p_pic, p_fmt_in, p_fmt_out );
 360
 361     int err = 0;
 362     if( p_block )
 363     {
 364         if( fwrite( p_block->p_buffer, p_block->i_buffer, 1, file ) != 1 )
 365             err = errno;
 366         block_Release( p_block );
 367     }
 368
 369     if( fclose( file ) && !err )
 370         err = errno;
 371
 372     if( err )
 373     {
 374        errno = err;
 375        msg_Err( p_image->p_parent, "%s: %m", psz_url );
 376     }
 377
 378     return err ? VLC_EGENERIC : VLC_SUCCESS;
 379 }
 380
 381 /**
 382  * Convert an image to a different format
 383  *
 384  */
 385
 386 static picture_t *ImageConvert( image_handler_t *p_image, picture_t *p_pic,
 387                                 video_format_t *p_fmt_in,
 388                                 video_format_t *p_fmt_out )
 389 {
 390     void (*pf_release)( picture_t * );
 391     picture_t *p_pif;
 392
 393     if( !p_fmt_out->i_width && !p_fmt_out->i_height &&
 394         p_fmt_out->i_sar_num && p_fmt_out->i_sar_den &&
 395         p_fmt_out->i_sar_num * p_fmt_in->i_sar_den !=
 396         p_fmt_out->i_sar_den * p_fmt_in->i_sar_num )
 397     {
 398         p_fmt_out->i_width =
 399             p_fmt_in->i_sar_num * (int64_t)p_fmt_out->i_sar_den *
 400             p_fmt_in->i_width / p_fmt_in->i_sar_den / p_fmt_out->i_sar_num;
 401         p_fmt_out->i_visible_width =
 402             p_fmt_in->i_sar_num * (int64_t)p_fmt_out->i_sar_den *
 403             p_fmt_in->i_visible_width / p_fmt_in->i_sar_den /
 404             p_fmt_out->i_sar_num;
 405     }
 406
 407     if( !p_fmt_out->i_chroma ) p_fmt_out->i_chroma = p_fmt_in->i_chroma;
 408     if( !p_fmt_out->i_width )
 409         p_fmt_out->i_width = p_fmt_out->i_visible_width = p_fmt_in->i_width;
 410     if( !p_fmt_out->i_height )
 411         p_fmt_out->i_height = p_fmt_out->i_visible_height = p_fmt_in->i_height;
 412     if( !p_fmt_out->i_sar_num ) p_fmt_out->i_sar_num = p_fmt_in->i_sar_num;
 413     if( !p_fmt_out->i_sar_den ) p_fmt_out->i_sar_den = p_fmt_in->i_sar_den;
 414     if( !p_fmt_out->i_aspect ) p_fmt_out->i_aspect = p_fmt_in->i_aspect;
 415
 416     if( p_image->p_filter )
 417     if( p_image->p_filter->fmt_in.video.i_chroma != p_fmt_in->i_chroma ||
 418         p_image->p_filter->fmt_out.video.i_chroma != p_fmt_out->i_chroma )
 419     {
 420         /* We need to restart a new filter */
 421         DeleteFilter( p_image->p_filter );
 422         p_image->p_filter = NULL;
 423     }
 424
 425     /* Start a filter */
 426     if( !p_image->p_filter )
 427     {
 428         es_format_t fmt_in;
 429         es_format_Init( &fmt_in, VIDEO_ES, p_fmt_in->i_chroma );
 430         fmt_in.video = *p_fmt_in;
 431
 432         p_image->p_filter =
 433             CreateFilter( p_image->p_parent, &fmt_in, p_fmt_out, NULL );
 434
 435         if( !p_image->p_filter )
 436         {
 437             return NULL;
 438         }
 439     }
 440     else
 441     {
 442         /* Filters should handle on-the-fly size changes */
 443         p_image->p_filter->fmt_in.video = *p_fmt_in;
 444         p_image->p_filter->fmt_out.video = *p_fmt_out;
 445     }
 446
 447     pf_release = p_pic->pf_release;
 448     p_pic->pf_release = PicRelease; /* Small hack */
 449     p_pif = p_image->p_filter->pf_video_filter( p_image->p_filter, p_pic );
 450     p_pic->pf_release = pf_release;
 451
 452     if( p_fmt_in->i_chroma == p_fmt_out->i_chroma &&
 453         p_fmt_in->i_width == p_fmt_out->i_width &&
 454         p_fmt_in->i_height == p_fmt_out->i_height )
 455     {
 456         /* Duplicate image */
 457         p_pif->pf_release( p_pif ); /* XXX: Better fix must be possible */
 458         p_pif = p_image->p_filter->pf_vout_buffer_new( p_image->p_filter );
 459         if( p_pif ) vout_CopyPicture( p_image->p_parent, p_pif, p_pic );
 460     }
 461
 462     return p_pif;
 463 }
 464
 465 /**
 466  * Filter an image with a psz_module filter
 467  *
 468  */
 469
 470 static picture_t *ImageFilter( image_handler_t *p_image, picture_t *p_pic,
 471                                video_format_t *p_fmt, const char *psz_module )
 472 {
 473     void (*pf_release)( picture_t * );
 474     picture_t *p_pif;
 475
 476     /* Start a filter */
 477     if( !p_image->p_filter )
 478     {
 479         es_format_t fmt;
 480         es_format_Init( &fmt, VIDEO_ES, p_fmt->i_chroma );
 481         fmt.video = *p_fmt;
 482
 483         p_image->p_filter =
 484             CreateFilter( p_image->p_parent, &fmt, &fmt.video, psz_module );
 485
 486         if( !p_image->p_filter )
 487         {
 488             return NULL;
 489         }
 490     }
 491     else
 492     {
 493         /* Filters should handle on-the-fly size changes */
 494         p_image->p_filter->fmt_in.video = *p_fmt;
 495         p_image->p_filter->fmt_out.video = *p_fmt;
 496     }
 497
 498     pf_release = p_pic->pf_release;
 499     p_pic->pf_release = PicRelease; /* Small hack */
 500     p_pif = p_image->p_filter->pf_video_filter( p_image->p_filter, p_pic );
 501     p_pic->pf_release = pf_release;
 502
 503     return p_pif;
 504 }
 505
 506 /**
 507  * Misc functions
 508  *
 509  */
 510 static 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 static vlc_fourcc_t Ext2Fourcc( const char *psz_name )
 539 {
 540     int i;
 541
 542     psz_name = strrchr( psz_name, '.' );
 543     if( !psz_name ) return 0;
 544     psz_name++;
 545
 546     for( i = 0; ext_table[i].i_codec; i++ )
 547     {
 548         int j;
 549         for( j = 0; toupper(ext_table[i].psz_ext[j]) == toupper(psz_name[j]);
 550              j++ )
 551         {
 552             if( !ext_table[i].psz_ext[j] && !psz_name[j] )
 553                 return ext_table[i].i_codec;
 554         }
 555     }
 556
 557     return 0;
 558 }
 559
 560 /*
 561 static const char *Fourcc2Ext( vlc_fourcc_t i_codec )
 562 {
 563     int i;
 564
 565     for( i = 0; ext_table[i].i_codec != 0; i++ )
 566     {
 567         if( ext_table[i].i_codec == i_codec ) return ext_table[i].psz_ext;
 568     }
 569
 570     return NULL;
 571 }
 572 */
 573
 574 static void video_release_buffer( picture_t *p_pic )
 575 {
 576     if( p_pic && p_pic->p_data_orig ) free( p_pic->p_data_orig );
 577     if( p_pic && p_pic->p_sys ) free( p_pic->p_sys );
 578     if( p_pic ) free( p_pic );
 579 }
 580
 581 static picture_t *video_new_buffer( decoder_t *p_dec )
 582 {
 583     picture_t *p_pic = malloc( sizeof(picture_t) );
 584
 585     p_dec->fmt_out.video.i_chroma = p_dec->fmt_out.i_codec;
 586     vout_AllocatePicture( VLC_OBJECT(p_dec), p_pic,
 587                           p_dec->fmt_out.video.i_chroma,
 588                           p_dec->fmt_out.video.i_width,
 589                           p_dec->fmt_out.video.i_height,
 590                           p_dec->fmt_out.video.i_aspect );
 591
 592     if( !p_pic->i_planes )
 593     {
 594         free( p_pic );
 595         return 0;
 596     }
 597
 598     p_pic->pf_release = video_release_buffer;
 599     p_pic->i_status = RESERVED_PICTURE;
 600     p_pic->p_sys = NULL;
 601
 602     return p_pic;
 603 }
 604
 605 static void video_del_buffer( decoder_t *p_dec, picture_t *p_pic )
 606 {
 607     (void)p_dec;
 608     if( p_pic && p_pic->p_data_orig ) free( p_pic->p_data_orig );
 609     if( p_pic && p_pic->p_sys ) free( p_pic->p_sys );
 610     if( p_pic ) free( p_pic );
 611 }
 612
 613 static void video_link_picture( decoder_t *p_dec, picture_t *p_pic )
 614 {
 615     (void)p_dec; (void)p_pic;
 616 }
 617
 618 static void video_unlink_picture( decoder_t *p_dec, picture_t *p_pic )
 619 {
 620     (void)p_dec; (void)p_pic;
 621 }
 622
 623 static decoder_t *CreateDecoder( vlc_object_t *p_this, video_format_t *fmt )
 624 {
 625     decoder_t *p_dec;
 626
 627     p_dec = vlc_object_create( p_this, VLC_OBJECT_DECODER );
 628     if( p_dec == NULL )
 629     {
 630         msg_Err( p_this, "out of memory" );
 631         return NULL;
 632     }
 633
 634     p_dec->p_module = NULL;
 635     es_format_Init( &p_dec->fmt_in, VIDEO_ES, fmt->i_chroma );
 636     es_format_Init( &p_dec->fmt_out, VIDEO_ES, 0 );
 637     p_dec->fmt_in.video = *fmt;
 638     p_dec->b_pace_control = VLC_TRUE;
 639
 640     p_dec->pf_vout_buffer_new = video_new_buffer;
 641     p_dec->pf_vout_buffer_del = video_del_buffer;
 642     p_dec->pf_picture_link    = video_link_picture;
 643     p_dec->pf_picture_unlink  = video_unlink_picture;
 644
 645     vlc_object_attach( p_dec, p_this );
 646
 647     /* Find a suitable decoder module */
 648     p_dec->p_module = module_Need( p_dec, "decoder", "$codec", 0 );
 649     if( !p_dec->p_module )
 650     {
 651         msg_Err( p_dec, "no suitable decoder module for fourcc `%4.4s'.\n"
 652                  "VLC probably does not support this image format.",
 653                  (char*)&p_dec->fmt_in.i_codec );
 654
 655         DeleteDecoder( p_dec );
 656         return NULL;
 657     }
 658
 659     return p_dec;
 660 }
 661
 662 static void DeleteDecoder( decoder_t * p_dec )
 663 {
 664     vlc_object_detach( p_dec );
 665
 666     if( p_dec->p_module ) module_Unneed( p_dec, p_dec->p_module );
 667
 668     es_format_Clean( &p_dec->fmt_in );
 669     es_format_Clean( &p_dec->fmt_out );
 670
 671     vlc_object_destroy( p_dec );
 672     p_dec = NULL;
 673 }
 674
 675 static encoder_t *CreateEncoder( vlc_object_t *p_this, video_format_t *fmt_in,
 676                                  video_format_t *fmt_out )
 677 {
 678     encoder_t *p_enc;
 679
 680     p_enc = vlc_object_create( p_this, VLC_OBJECT_ENCODER );
 681     if( p_enc == NULL )
 682     {
 683         msg_Err( p_this, "out of memory" );
 684         return NULL;
 685     }
 686
 687     p_enc->p_module = NULL;
 688     es_format_Init( &p_enc->fmt_in, VIDEO_ES, fmt_in->i_chroma );
 689     p_enc->fmt_in.video = *fmt_in;
 690     if( fmt_out->i_width > 0 && fmt_out->i_height > 0 )
 691     {
 692         p_enc->fmt_in.video.i_width = fmt_out->i_width;
 693         p_enc->fmt_in.video.i_height = fmt_out->i_height;
 694
 695         if( fmt_out->i_visible_width > 0 &&
 696             fmt_out->i_visible_height > 0 )
 697         {
 698             p_enc->fmt_in.video.i_visible_width = fmt_out->i_visible_width;
 699             p_enc->fmt_in.video.i_visible_height = fmt_out->i_visible_height;
 700         }
 701         else
 702         {
 703             p_enc->fmt_in.video.i_visible_width = fmt_out->i_width;
 704             p_enc->fmt_in.video.i_visible_height = fmt_out->i_height;
 705         }
 706     }
 707     else if( fmt_out->i_sar_num && fmt_out->i_sar_den &&
 708              fmt_out->i_sar_num * fmt_in->i_sar_den !=
 709              fmt_out->i_sar_den * fmt_in->i_sar_num )
 710     {
 711         p_enc->fmt_in.video.i_width =
 712             fmt_in->i_sar_num * (int64_t)fmt_out->i_sar_den * fmt_in->i_width /
 713             fmt_in->i_sar_den / fmt_out->i_sar_num;
 714         p_enc->fmt_in.video.i_visible_width =
 715             fmt_in->i_sar_num * (int64_t)fmt_out->i_sar_den *
 716             fmt_in->i_visible_width / fmt_in->i_sar_den / fmt_out->i_sar_num;
 717     }
 718
 719     p_enc->fmt_in.video.i_frame_rate = 25;
 720     p_enc->fmt_in.video.i_frame_rate_base = 1;
 721
 722     es_format_Init( &p_enc->fmt_out, VIDEO_ES, fmt_out->i_chroma );
 723     p_enc->fmt_out.video = *fmt_out;
 724     p_enc->fmt_out.video.i_width = p_enc->fmt_in.video.i_width;
 725     p_enc->fmt_out.video.i_height = p_enc->fmt_in.video.i_height;
 726
 727     vlc_object_attach( p_enc, p_this );
 728
 729     /* Find a suitable decoder module */
 730     p_enc->p_module = module_Need( p_enc, "encoder", 0, 0 );
 731     if( !p_enc->p_module )
 732     {
 733         msg_Err( p_enc, "no suitable encoder module for fourcc `%4.4s'.\n"
 734                  "VLC probably does not support this image format.",
 735                  (char*)&p_enc->fmt_out.i_codec );
 736
 737         DeleteEncoder( p_enc );
 738         return NULL;
 739     }
 740     p_enc->fmt_in.video.i_chroma = p_enc->fmt_in.i_codec;
 741
 742     return p_enc;
 743 }
 744
 745 static void DeleteEncoder( encoder_t * p_enc )
 746 {
 747     vlc_object_detach( p_enc );
 748
 749     if( p_enc->p_module ) module_Unneed( p_enc, p_enc->p_module );
 750
 751     es_format_Clean( &p_enc->fmt_in );
 752     es_format_Clean( &p_enc->fmt_out );
 753
 754     vlc_object_destroy( p_enc );
 755     p_enc = NULL;
 756 }
 757
 758 static filter_t *CreateFilter( vlc_object_t *p_this, es_format_t *p_fmt_in,
 759                                video_format_t *p_fmt_out,
 760                                const char *psz_module )
 761 {
 762     filter_t *p_filter;
 763
 764     p_filter = vlc_object_create( p_this, VLC_OBJECT_FILTER );
 765     vlc_object_attach( p_filter, p_this );
 766
 767     p_filter->pf_vout_buffer_new =
 768         (picture_t *(*)(filter_t *))video_new_buffer;
 769     p_filter->pf_vout_buffer_del =
 770         (void (*)(filter_t *, picture_t *))video_del_buffer;
 771
 772     p_filter->fmt_in = *p_fmt_in;
 773     p_filter->fmt_out = *p_fmt_in;
 774     p_filter->fmt_out.i_codec = p_fmt_out->i_chroma;
 775     p_filter->fmt_out.video = *p_fmt_out;
 776     p_filter->p_module = module_Need( p_filter, "video filter2",
 777                                       psz_module, 0 );
 778
 779     if( !p_filter->p_module )
 780     {
 781         msg_Dbg( p_filter, "no video filter found" );
 782         DeleteFilter( p_filter );
 783         return NULL;
 784     }
 785
 786     return p_filter;
 787 }
 788
 789 static void DeleteFilter( filter_t * p_filter )
 790 {
 791     vlc_object_detach( p_filter );
 792
 793     if( p_filter->p_module ) module_Unneed( p_filter, p_filter->p_module );
 794
 795     es_format_Clean( &p_filter->fmt_in );
 796     es_format_Clean( &p_filter->fmt_out );
 797
 798     vlc_object_destroy( p_filter );
 799     p_filter = NULL;
 800 }