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
  74 static void video_release_buffer_dummy( picture_t *p_pic );
  75
  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 = malloc( sizeof(image_handler_t) );
  85
  86     memset( p_image, 0, sizeof(image_handler_t) );
  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     p_image->pf_filter = ImageFilter;
  95
  96     return p_image;
  97 }
  98
  99 /**
 100  * Delete the image_handler_t instance
 101  *
 102  */
 103 void image_HandlerDelete( image_handler_t *p_image )
 104 {
 105     if( !p_image ) return;
 106
 107     if( p_image->p_dec ) DeleteDecoder( p_image->p_dec );
 108     if( p_image->p_enc ) DeleteEncoder( p_image->p_enc );
 109     if( p_image->p_filter ) DeleteFilter( p_image->p_filter );
 110
 111     free( p_image );
 112     p_image = NULL;
 113 }
 114
 115 /**
 116  * Read an image
 117  *
 118  */
 119
 120 static picture_t *ImageRead( image_handler_t *p_image, block_t *p_block,
 121                              video_format_t *p_fmt_in,
 122                              video_format_t *p_fmt_out )
 123 {
 124     picture_t *p_pic = NULL, *p_tmp;
 125
 126     /* Check if we can reuse the current decoder */
 127     if( p_image->p_dec &&
 128         p_image->p_dec->fmt_in.i_codec != p_fmt_in->i_chroma )
 129     {
 130         DeleteDecoder( p_image->p_dec );
 131         p_image->p_dec = 0;
 132     }
 133
 134     /* Start a decoder */
 135     if( !p_image->p_dec )
 136     {
 137         p_image->p_dec = CreateDecoder( p_image->p_parent, p_fmt_in );
 138         if( !p_image->p_dec ) return NULL;
 139     }
 140
 141     p_block->i_pts = p_block->i_dts = mdate();
 142     while( (p_tmp = p_image->p_dec->pf_decode_video( p_image->p_dec, &p_block ))
 143              != NULL )
 144     {
 145         if ( p_pic != NULL )
 146             p_pic->pf_release( p_pic );
 147         p_pic = p_tmp;
 148     }
 149
 150     if( p_pic == NULL )
 151     {
 152         msg_Warn( p_image->p_parent, "no image decoded" );
 153         return 0;
 154     }
 155
 156     if( !p_fmt_out->i_chroma )
 157         p_fmt_out->i_chroma = p_image->p_dec->fmt_out.video.i_chroma;
 158     if( !p_fmt_out->i_width && p_fmt_out->i_height )
 159         p_fmt_out->i_width = p_fmt_out->i_height
 160                               * p_image->p_dec->fmt_out.video.i_aspect
 161                               / VOUT_ASPECT_FACTOR;
 162     if( !p_fmt_out->i_height && p_fmt_out->i_width )
 163         p_fmt_out->i_height = p_fmt_out->i_width * VOUT_ASPECT_FACTOR
 164                                / p_image->p_dec->fmt_out.video.i_aspect;
 165     if( !p_fmt_out->i_width )
 166         p_fmt_out->i_width = p_image->p_dec->fmt_out.video.i_width;
 167     if( !p_fmt_out->i_height )
 168         p_fmt_out->i_height = p_image->p_dec->fmt_out.video.i_height;
 169
 170     /* Check if we need chroma conversion or resizing */
 171     if( p_image->p_dec->fmt_out.video.i_chroma != p_fmt_out->i_chroma ||
 172         p_image->p_dec->fmt_out.video.i_width != p_fmt_out->i_width ||
 173         p_image->p_dec->fmt_out.video.i_height != p_fmt_out->i_height )
 174     {
 175         if( p_image->p_filter )
 176         if( p_image->p_filter->fmt_in.video.i_chroma !=
 177             p_image->p_dec->fmt_out.video.i_chroma ||
 178             p_image->p_filter->fmt_out.video.i_chroma != p_fmt_out->i_chroma )
 179         {
 180             /* We need to restart a new filter */
 181             DeleteFilter( p_image->p_filter );
 182             p_image->p_filter = 0;
 183         }
 184
 185         /* Start a filter */
 186         if( !p_image->p_filter )
 187         {
 188             p_image->p_filter =
 189                 CreateFilter( p_image->p_parent, &p_image->p_dec->fmt_out,
 190                               p_fmt_out, NULL );
 191
 192             if( !p_image->p_filter )
 193             {
 194                 p_pic->pf_release( p_pic );
 195                 return NULL;
 196             }
 197         }
 198         else
 199         {
 200             /* Filters should handle on-the-fly size changes */
 201             p_image->p_filter->fmt_in = p_image->p_dec->fmt_out;
 202             p_image->p_filter->fmt_out = p_image->p_dec->fmt_out;
 203             p_image->p_filter->fmt_out.i_codec = p_fmt_out->i_chroma;
 204             p_image->p_filter->fmt_out.video = *p_fmt_out;
 205         }
 206
 207         p_pic = p_image->p_filter->pf_video_filter( p_image->p_filter, p_pic );
 208         *p_fmt_out = p_image->p_filter->fmt_out.video;
 209     }
 210     else *p_fmt_out = p_image->p_dec->fmt_out.video;
 211
 212     return p_pic;
 213 }
 214
 215 static picture_t *ImageReadUrl( image_handler_t *p_image, const char *psz_url,
 216                                 video_format_t *p_fmt_in,
 217                                 video_format_t *p_fmt_out )
 218 {
 219     block_t *p_block;
 220     picture_t *p_pic;
 221     stream_t *p_stream = NULL;
 222     int i_size;
 223
 224     p_stream = stream_UrlNew( p_image->p_parent, psz_url );
 225
 226     if( !p_stream )
 227     {
 228         msg_Dbg( p_image->p_parent, "could not open %s for reading",
 229                  psz_url );
 230         return NULL;
 231     }
 232
 233     i_size = stream_Size( p_stream );
 234
 235     p_block = block_New( p_image->p_parent, i_size );
 236
 237     stream_Read( p_stream, p_block->p_buffer, i_size );
 238     stream_Delete( p_stream );
 239
 240     if( !p_fmt_in->i_chroma )
 241     {
 242         /* Try to guess format from file name */
 243         p_fmt_in->i_chroma = Ext2Fourcc( psz_url );
 244     }
 245
 246     p_pic = ImageRead( p_image, p_block, p_fmt_in, p_fmt_out );
 247
 248     return p_pic;
 249 }
 250
 251 /**
 252  * Write an image
 253  *
 254  */
 255
 256 static block_t *ImageWrite( image_handler_t *p_image, picture_t *p_pic,
 257                             video_format_t *p_fmt_in,
 258                             video_format_t *p_fmt_out )
 259 {
 260     block_t *p_block;
 261
 262     /* Check if we can reuse the current encoder */
 263     if( p_image->p_enc &&
 264         ( p_image->p_enc->fmt_out.i_codec != p_fmt_out->i_chroma ||
 265           p_image->p_enc->fmt_out.video.i_width != p_fmt_out->i_width ||
 266           p_image->p_enc->fmt_out.video.i_height != p_fmt_out->i_height ) )
 267     {
 268         DeleteEncoder( p_image->p_enc );
 269         p_image->p_enc = 0;
 270     }
 271
 272     /* Start an encoder */
 273     if( !p_image->p_enc )
 274     {
 275         p_image->p_enc = CreateEncoder( p_image->p_parent,
 276                                         p_fmt_in, p_fmt_out );
 277         if( !p_image->p_enc ) return NULL;
 278     }
 279
 280     /* Check if we need chroma conversion or resizing */
 281     if( p_image->p_enc->fmt_in.video.i_chroma != p_fmt_in->i_chroma ||
 282         p_image->p_enc->fmt_in.video.i_width != p_fmt_in->i_width ||
 283         p_image->p_enc->fmt_in.video.i_height != p_fmt_in->i_height )
 284     {
 285         picture_t *p_tmp_pic;
 286
 287         if( p_image->p_filter )
 288         if( p_image->p_filter->fmt_in.video.i_chroma != p_fmt_in->i_chroma ||
 289             p_image->p_filter->fmt_out.video.i_chroma !=
 290             p_image->p_enc->fmt_in.video.i_chroma )
 291         {
 292             /* We need to restart a new filter */
 293             DeleteFilter( p_image->p_filter );
 294             p_image->p_filter = 0;
 295         }
 296
 297         /* Start a filter */
 298         if( !p_image->p_filter )
 299         {
 300             es_format_t fmt_in;
 301             es_format_Init( &fmt_in, VIDEO_ES, p_fmt_in->i_chroma );
 302             fmt_in.video = *p_fmt_in;
 303
 304             p_image->p_filter =
 305                 CreateFilter( p_image->p_parent, &fmt_in,
 306                               &p_image->p_enc->fmt_in.video, NULL );
 307
 308             if( !p_image->p_filter )
 309             {
 310                 return NULL;
 311             }
 312         }
 313         else
 314         {
 315             /* Filters should handle on-the-fly size changes */
 316             p_image->p_filter->fmt_in.i_codec = p_fmt_in->i_chroma;
 317             p_image->p_filter->fmt_out.video = *p_fmt_in;
 318             p_image->p_filter->fmt_out.i_codec =p_image->p_enc->fmt_in.i_codec;
 319             p_image->p_filter->fmt_out.video = p_image->p_enc->fmt_in.video;
 320         }
 321
 322         p_pic->i_refcount++; /* pf_video_filter() will call pf_release() */
 323         p_tmp_pic =
 324             p_image->p_filter->pf_video_filter( p_image->p_filter, p_pic );
 325
 326         p_block = p_image->p_enc->pf_encode_video( p_image->p_enc, p_tmp_pic );
 327
 328         p_image->p_filter->pf_vout_buffer_del( p_image->p_filter, p_tmp_pic );
 329     }
 330     else
 331     {
 332         p_block = p_image->p_enc->pf_encode_video( p_image->p_enc, p_pic );
 333     }
 334
 335     if( !p_block )
 336     {
 337         msg_Dbg( p_image->p_parent, "no image encoded" );
 338         return 0;
 339     }
 340
 341     return p_block;
 342 }
 343
 344 static int ImageWriteUrl( image_handler_t *p_image, picture_t *p_pic,
 345                           video_format_t *p_fmt_in, video_format_t *p_fmt_out,
 346                           const char *psz_url )
 347 {
 348     block_t *p_block;
 349     FILE *file;
 350
 351     if( !p_fmt_out->i_chroma )
 352     {
 353         /* Try to guess format from file name */
 354         p_fmt_out->i_chroma = Ext2Fourcc( psz_url );
 355     }
 356
 357     file = utf8_fopen( psz_url, "wb" );
 358     if( !file )
 359     {
 360         msg_Err( p_image->p_parent, "%s: %m", psz_url );
 361         return VLC_EGENERIC;
 362     }
 363
 364     p_block = ImageWrite( p_image, p_pic, p_fmt_in, p_fmt_out );
 365
 366     int err = 0;
 367     if( p_block )
 368     {
 369         if( fwrite( p_block->p_buffer, p_block->i_buffer, 1, file ) != 1 )
 370             err = errno;
 371         block_Release( p_block );
 372     }
 373
 374     if( fclose( file ) && !err )
 375         err = errno;
 376
 377     if( err )
 378     {
 379        errno = err;
 380        msg_Err( p_image->p_parent, "%s: %m", psz_url );
 381     }
 382
 383     return err ? VLC_EGENERIC : VLC_SUCCESS;
 384 }
 385
 386 /**
 387  * Convert an image to a different format
 388  *
 389  */
 390
 391 static picture_t *ImageConvert( image_handler_t *p_image, picture_t *p_pic,
 392                                 video_format_t *p_fmt_in,
 393                                 video_format_t *p_fmt_out )
 394 {
 395     picture_t *p_pif;
 396
 397     if( !p_fmt_out->i_width && !p_fmt_out->i_height &&
 398         p_fmt_out->i_sar_num && p_fmt_out->i_sar_den &&
 399         p_fmt_out->i_sar_num * p_fmt_in->i_sar_den !=
 400         p_fmt_out->i_sar_den * p_fmt_in->i_sar_num )
 401     {
 402         p_fmt_out->i_width =
 403             p_fmt_in->i_sar_num * (int64_t)p_fmt_out->i_sar_den *
 404             p_fmt_in->i_width / p_fmt_in->i_sar_den / p_fmt_out->i_sar_num;
 405         p_fmt_out->i_visible_width =
 406             p_fmt_in->i_sar_num * (int64_t)p_fmt_out->i_sar_den *
 407             p_fmt_in->i_visible_width / p_fmt_in->i_sar_den /
 408             p_fmt_out->i_sar_num;
 409     }
 410
 411     if( !p_fmt_out->i_chroma ) p_fmt_out->i_chroma = p_fmt_in->i_chroma;
 412     if( !p_fmt_out->i_width )
 413         p_fmt_out->i_width = p_fmt_out->i_visible_width = p_fmt_in->i_width;
 414     if( !p_fmt_out->i_height )
 415         p_fmt_out->i_height = p_fmt_out->i_visible_height = p_fmt_in->i_height;
 416     if( !p_fmt_out->i_sar_num ) p_fmt_out->i_sar_num = p_fmt_in->i_sar_num;
 417     if( !p_fmt_out->i_sar_den ) p_fmt_out->i_sar_den = p_fmt_in->i_sar_den;
 418     if( !p_fmt_out->i_aspect ) p_fmt_out->i_aspect = p_fmt_in->i_aspect;
 419
 420     if( p_image->p_filter )
 421     if( p_image->p_filter->fmt_in.video.i_chroma != p_fmt_in->i_chroma ||
 422         p_image->p_filter->fmt_out.video.i_chroma != p_fmt_out->i_chroma )
 423     {
 424         /* We need to restart a new filter */
 425         DeleteFilter( p_image->p_filter );
 426         p_image->p_filter = NULL;
 427     }
 428
 429     /* Start a filter */
 430     if( !p_image->p_filter )
 431     {
 432         es_format_t fmt_in;
 433         es_format_Init( &fmt_in, VIDEO_ES, p_fmt_in->i_chroma );
 434         fmt_in.video = *p_fmt_in;
 435
 436         p_image->p_filter =
 437             CreateFilter( p_image->p_parent, &fmt_in, p_fmt_out, NULL );
 438
 439         if( !p_image->p_filter )
 440         {
 441             return NULL;
 442         }
 443     }
 444     else
 445     {
 446         /* Filters should handle on-the-fly size changes */
 447         p_image->p_filter->fmt_in.video = *p_fmt_in;
 448         p_image->p_filter->fmt_out.video = *p_fmt_out;
 449     }
 450
 451     /* We have to override the current release scheme for p_pic.
 452      * (You cannot suppose what pf_release will do or even if it
 453      * is defined) */
 454     void (*pf_sav_release)( picture_t * ) = p_pic->pf_release;
 455
 456     p_pic->pf_release = video_release_buffer_dummy;
 457     p_pif = p_image->p_filter->pf_video_filter( p_image->p_filter, p_pic );
 458     p_pic->pf_release = pf_sav_release;
 459
 460     if( p_fmt_in->i_chroma == p_fmt_out->i_chroma &&
 461         p_fmt_in->i_width == p_fmt_out->i_width &&
 462         p_fmt_in->i_height == p_fmt_out->i_height )
 463     {
 464         /* Duplicate image */
 465         p_pif->pf_release( p_pif ); /* XXX: Better fix must be possible */
 466         p_pif = p_image->p_filter->pf_vout_buffer_new( p_image->p_filter );
 467         if( p_pif ) vout_CopyPicture( p_image->p_parent, p_pif, p_pic );
 468     }
 469
 470     return p_pif;
 471 }
 472
 473 /**
 474  * Filter an image with a psz_module filter
 475  *
 476  */
 477
 478 static picture_t *ImageFilter( image_handler_t *p_image, picture_t *p_pic,
 479                                video_format_t *p_fmt, const char *psz_module )
 480 {
 481     /* Start a filter */
 482     if( !p_image->p_filter )
 483     {
 484         es_format_t fmt;
 485         es_format_Init( &fmt, VIDEO_ES, p_fmt->i_chroma );
 486         fmt.video = *p_fmt;
 487
 488         p_image->p_filter =
 489             CreateFilter( p_image->p_parent, &fmt, &fmt.video, psz_module );
 490
 491         if( !p_image->p_filter )
 492         {
 493             return NULL;
 494         }
 495     }
 496     else
 497     {
 498         /* Filters should handle on-the-fly size changes */
 499         p_image->p_filter->fmt_in.video = *p_fmt;
 500         p_image->p_filter->fmt_out.video = *p_fmt;
 501     }
 502
 503     p_pic->i_refcount++; /* pf_video_filter() will call pf_release() */
 504     return p_image->p_filter->pf_video_filter( p_image->p_filter, p_pic );
 505 }
 506
 507 /**
 508  * Misc functions
 509  *
 510  */
 511 static struct
 512 {
 513     vlc_fourcc_t i_codec;
 514     const char *psz_ext;
 515
 516 } ext_table[] =
 517 {
 518     { VLC_FOURCC('j','p','e','g'), "jpeg" },
 519     { VLC_FOURCC('j','p','e','g'), "jpg"  },
 520     { VLC_FOURCC('l','j','p','g'), "ljpg" },
 521     { VLC_FOURCC('p','n','g',' '), "png" },
 522     { VLC_FOURCC('p','g','m',' '), "pgm" },
 523     { VLC_FOURCC('p','g','m','y'), "pgmyuv" },
 524     { VLC_FOURCC('p','b','m',' '), "pbm" },
 525     { VLC_FOURCC('p','a','m',' '), "pam" },
 526     { VLC_FOURCC('t','g','a',' '), "tga" },
 527     { VLC_FOURCC('b','m','p',' '), "bmp" },
 528     { VLC_FOURCC('p','n','m',' '), "pnm" },
 529     { VLC_FOURCC('x','p','m',' '), "xpm" },
 530     { VLC_FOURCC('x','c','f',' '), "xcf" },
 531     { VLC_FOURCC('p','c','x',' '), "pcx" },
 532     { VLC_FOURCC('g','i','f',' '), "gif" },
 533     { VLC_FOURCC('t','i','f','f'), "tif" },
 534     { VLC_FOURCC('t','i','f','f'), "tiff" },
 535     { VLC_FOURCC('l','b','m',' '), "lbm" },
 536     { 0, NULL }
 537 };
 538
 539 static vlc_fourcc_t Ext2Fourcc( const char *psz_name )
 540 {
 541     int i;
 542
 543     psz_name = strrchr( psz_name, '.' );
 544     if( !psz_name ) return 0;
 545     psz_name++;
 546
 547     for( i = 0; ext_table[i].i_codec; i++ )
 548     {
 549         int j;
 550         for( j = 0; toupper(ext_table[i].psz_ext[j]) == toupper(psz_name[j]);
 551              j++ )
 552         {
 553             if( !ext_table[i].psz_ext[j] && !psz_name[j] )
 554                 return ext_table[i].i_codec;
 555         }
 556     }
 557
 558     return 0;
 559 }
 560
 561 /*
 562 static const char *Fourcc2Ext( vlc_fourcc_t i_codec )
 563 {
 564     int i;
 565
 566     for( i = 0; ext_table[i].i_codec != 0; i++ )
 567     {
 568         if( ext_table[i].i_codec == i_codec ) return ext_table[i].psz_ext;
 569     }
 570
 571     return NULL;
 572 }
 573 */
 574
 575 static void video_release_buffer_dummy( picture_t *p_pic )
 576 {
 577     VLC_UNUSED( p_pic );
 578 }
 579 static void video_release_buffer( picture_t *p_pic )
 580 {
 581     if( --p_pic->i_refcount > 0 ) return;
 582
 583     free( p_pic->p_data_orig );
 584     free( p_pic->p_sys );
 585     free( p_pic );
 586 }
 587
 588 static picture_t *video_new_buffer( decoder_t *p_dec )
 589 {
 590     picture_t *p_pic = malloc( sizeof(picture_t) );
 591
 592     p_dec->fmt_out.video.i_chroma = p_dec->fmt_out.i_codec;
 593     vout_AllocatePicture( VLC_OBJECT(p_dec), p_pic,
 594                           p_dec->fmt_out.video.i_chroma,
 595                           p_dec->fmt_out.video.i_width,
 596                           p_dec->fmt_out.video.i_height,
 597                           p_dec->fmt_out.video.i_aspect );
 598
 599     if( !p_pic->i_planes )
 600     {
 601         free( p_pic );
 602         return 0;
 603     }
 604
 605     p_pic->i_refcount = 1;
 606     p_pic->pf_release = video_release_buffer;
 607     p_pic->i_status = RESERVED_PICTURE;
 608     p_pic->p_sys = NULL;
 609
 610     return p_pic;
 611 }
 612
 613 static void video_del_buffer( decoder_t *p_dec, picture_t *p_pic )
 614 {
 615     (void)p_dec;
 616     free( p_pic->p_data_orig );
 617     free( p_pic->p_sys );
 618     free( p_pic );
 619 }
 620
 621 static void video_link_picture( decoder_t *p_dec, picture_t *p_pic )
 622 {
 623     (void)p_dec;
 624     p_pic->i_refcount++;
 625 }
 626
 627 static void video_unlink_picture( decoder_t *p_dec, picture_t *p_pic )
 628 {
 629     (void)p_dec; (void)p_pic;
 630     video_release_buffer( p_pic );
 631 }
 632
 633 static decoder_t *CreateDecoder( vlc_object_t *p_this, video_format_t *fmt )
 634 {
 635     decoder_t *p_dec;
 636
 637     p_dec = vlc_object_create( p_this, VLC_OBJECT_DECODER );
 638     if( p_dec == NULL )
 639         return NULL;
 640
 641     p_dec->p_module = NULL;
 642     es_format_Init( &p_dec->fmt_in, VIDEO_ES, fmt->i_chroma );
 643     es_format_Init( &p_dec->fmt_out, VIDEO_ES, 0 );
 644     p_dec->fmt_in.video = *fmt;
 645     p_dec->b_pace_control = true;
 646
 647     p_dec->pf_vout_buffer_new = video_new_buffer;
 648     p_dec->pf_vout_buffer_del = video_del_buffer;
 649     p_dec->pf_picture_link    = video_link_picture;
 650     p_dec->pf_picture_unlink  = video_unlink_picture;
 651
 652     vlc_object_attach( p_dec, p_this );
 653
 654     /* Find a suitable decoder module */
 655     p_dec->p_module = module_Need( p_dec, "decoder", "$codec", 0 );
 656     if( !p_dec->p_module )
 657     {
 658         msg_Err( p_dec, "no suitable decoder module for fourcc `%4.4s'.\n"
 659                  "VLC probably does not support this image format.",
 660                  (char*)&p_dec->fmt_in.i_codec );
 661
 662         DeleteDecoder( p_dec );
 663         return NULL;
 664     }
 665
 666     return p_dec;
 667 }
 668
 669 static void DeleteDecoder( decoder_t * p_dec )
 670 {
 671     vlc_object_detach( p_dec );
 672
 673     if( p_dec->p_module ) module_Unneed( p_dec, p_dec->p_module );
 674
 675     es_format_Clean( &p_dec->fmt_in );
 676     es_format_Clean( &p_dec->fmt_out );
 677
 678     vlc_object_release( p_dec );
 679     p_dec = NULL;
 680 }
 681
 682 static encoder_t *CreateEncoder( vlc_object_t *p_this, video_format_t *fmt_in,
 683                                  video_format_t *fmt_out )
 684 {
 685     encoder_t *p_enc;
 686
 687     p_enc = vlc_object_create( p_this, VLC_OBJECT_ENCODER );
 688     if( p_enc == NULL )
 689         return NULL;
 690
 691     p_enc->p_module = NULL;
 692     es_format_Init( &p_enc->fmt_in, VIDEO_ES, fmt_in->i_chroma );
 693     p_enc->fmt_in.video = *fmt_in;
 694     if( fmt_out->i_width > 0 && fmt_out->i_height > 0 )
 695     {
 696         p_enc->fmt_in.video.i_width = fmt_out->i_width;
 697         p_enc->fmt_in.video.i_height = fmt_out->i_height;
 698
 699         if( fmt_out->i_visible_width > 0 &&
 700             fmt_out->i_visible_height > 0 )
 701         {
 702             p_enc->fmt_in.video.i_visible_width = fmt_out->i_visible_width;
 703             p_enc->fmt_in.video.i_visible_height = fmt_out->i_visible_height;
 704         }
 705         else
 706         {
 707             p_enc->fmt_in.video.i_visible_width = fmt_out->i_width;
 708             p_enc->fmt_in.video.i_visible_height = fmt_out->i_height;
 709         }
 710     }
 711     else if( fmt_out->i_sar_num && fmt_out->i_sar_den &&
 712              fmt_out->i_sar_num * fmt_in->i_sar_den !=
 713              fmt_out->i_sar_den * fmt_in->i_sar_num )
 714     {
 715         p_enc->fmt_in.video.i_width =
 716             fmt_in->i_sar_num * (int64_t)fmt_out->i_sar_den * fmt_in->i_width /
 717             fmt_in->i_sar_den / fmt_out->i_sar_num;
 718         p_enc->fmt_in.video.i_visible_width =
 719             fmt_in->i_sar_num * (int64_t)fmt_out->i_sar_den *
 720             fmt_in->i_visible_width / fmt_in->i_sar_den / fmt_out->i_sar_num;
 721     }
 722
 723     p_enc->fmt_in.video.i_frame_rate = 25;
 724     p_enc->fmt_in.video.i_frame_rate_base = 1;
 725
 726     es_format_Init( &p_enc->fmt_out, VIDEO_ES, fmt_out->i_chroma );
 727     p_enc->fmt_out.video = *fmt_out;
 728     p_enc->fmt_out.video.i_width = p_enc->fmt_in.video.i_width;
 729     p_enc->fmt_out.video.i_height = p_enc->fmt_in.video.i_height;
 730
 731     vlc_object_attach( p_enc, p_this );
 732
 733     /* Find a suitable decoder module */
 734     p_enc->p_module = module_Need( p_enc, "encoder", 0, 0 );
 735     if( !p_enc->p_module )
 736     {
 737         msg_Err( p_enc, "no suitable encoder module for fourcc `%4.4s'.\n"
 738                  "VLC probably does not support this image format.",
 739                  (char*)&p_enc->fmt_out.i_codec );
 740
 741         DeleteEncoder( p_enc );
 742         return NULL;
 743     }
 744     p_enc->fmt_in.video.i_chroma = p_enc->fmt_in.i_codec;
 745
 746     return p_enc;
 747 }
 748
 749 static void DeleteEncoder( encoder_t * p_enc )
 750 {
 751     vlc_object_detach( p_enc );
 752
 753     if( p_enc->p_module ) module_Unneed( p_enc, p_enc->p_module );
 754
 755     es_format_Clean( &p_enc->fmt_in );
 756     es_format_Clean( &p_enc->fmt_out );
 757
 758     vlc_object_release( p_enc );
 759     p_enc = NULL;
 760 }
 761
 762 static filter_t *CreateFilter( vlc_object_t *p_this, es_format_t *p_fmt_in,
 763                                video_format_t *p_fmt_out,
 764                                const char *psz_module )
 765 {
 766     static const char typename[] = "filter";
 767     filter_t *p_filter;
 768
 769     p_filter = vlc_custom_create( p_this, sizeof(filter_t),
 770                                   VLC_OBJECT_GENERIC, typename );
 771     vlc_object_attach( p_filter, p_this );
 772
 773     p_filter->pf_vout_buffer_new =
 774         (picture_t *(*)(filter_t *))video_new_buffer;
 775     p_filter->pf_vout_buffer_del =
 776         (void (*)(filter_t *, picture_t *))video_del_buffer;
 777
 778     p_filter->fmt_in = *p_fmt_in;
 779     p_filter->fmt_out = *p_fmt_in;
 780     p_filter->fmt_out.i_codec = p_fmt_out->i_chroma;
 781     p_filter->fmt_out.video = *p_fmt_out;
 782     p_filter->p_module = module_Need( p_filter, "video filter2",
 783                                       psz_module, 0 );
 784
 785     if( !p_filter->p_module )
 786     {
 787         msg_Dbg( p_filter, "no video filter found" );
 788         DeleteFilter( p_filter );
 789         return NULL;
 790     }
 791
 792     return p_filter;
 793 }
 794
 795 static void DeleteFilter( filter_t * p_filter )
 796 {
 797     vlc_object_detach( p_filter );
 798
 799     if( p_filter->p_module ) module_Unneed( p_filter, p_filter->p_module );
 800
 801     es_format_Clean( &p_filter->fmt_in );
 802     es_format_Clean( &p_filter->fmt_out );
 803
 804     vlc_object_release( p_filter );
 805 }