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 #ifdef HAVE_CONFIG_H
  35 # include "config.h"
  36 #endif
  37
  38 #include <vlc/vlc.h>
  39 #include <vlc_codec.h>
  40 #include <vlc_filter.h>
  41 #include <vlc_es.h>
  42 #include <vlc_image.h>
  43 #include <vlc_stream.h>
  44 #include <vlc_charset.h>
  45
  46 static picture_t *ImageRead( image_handler_t *, block_t *,
  47                              video_format_t *, video_format_t * );
  48 static picture_t *ImageReadUrl( image_handler_t *, const char *,
  49                                 video_format_t *, video_format_t * );
  50 static block_t *ImageWrite( image_handler_t *, picture_t *,
  51                             video_format_t *, video_format_t * );
  52 static int ImageWriteUrl( image_handler_t *, picture_t *,
  53                           video_format_t *, video_format_t *, const char * );
  54
  55 static picture_t *ImageConvert( image_handler_t *, picture_t *,
  56                                 video_format_t *, video_format_t * );
  57 static picture_t *ImageFilter( image_handler_t *, picture_t *,
  58                                video_format_t *, const char *psz_module );
  59
  60 static decoder_t *CreateDecoder( vlc_object_t *, video_format_t * );
  61 static void DeleteDecoder( decoder_t * );
  62 static encoder_t *CreateEncoder( vlc_object_t *, video_format_t *,
  63                                  video_format_t * );
  64 static void DeleteEncoder( encoder_t * );
  65 static filter_t *CreateFilter( vlc_object_t *, es_format_t *,
  66                                video_format_t *, const char * );
  67 static void DeleteFilter( filter_t * );
  68
  69 static vlc_fourcc_t Ext2Fourcc( const char * );
  70 /*static const char *Fourcc2Ext( vlc_fourcc_t );*/
  71
  72 /**
  73  * Create an image_handler_t instance
  74  *
  75  */
  76 image_handler_t *__image_HandlerCreate( vlc_object_t *p_this )
  77 {
  78     image_handler_t *p_image = malloc( sizeof(image_handler_t) );
  79
  80     memset( p_image, 0, sizeof(image_handler_t) );
  81     p_image->p_parent = p_this;
  82
  83     p_image->pf_read = ImageRead;
  84     p_image->pf_read_url = ImageReadUrl;
  85     p_image->pf_write = ImageWrite;
  86     p_image->pf_write_url = ImageWriteUrl;
  87     p_image->pf_convert = ImageConvert;
  88     p_image->pf_filter = ImageFilter;
  89
  90     return p_image;
  91 }
  92
  93 /**
  94  * Delete the image_handler_t instance
  95  *
  96  */
  97 void image_HandlerDelete( image_handler_t *p_image )
  98 {
  99     if( !p_image ) return;
 100
 101     if( p_image->p_dec ) DeleteDecoder( p_image->p_dec );
 102     if( p_image->p_enc ) DeleteEncoder( p_image->p_enc );
 103     if( p_image->p_filter ) DeleteFilter( p_image->p_filter );
 104
 105     free( p_image );
 106     p_image = NULL;
 107 }
 108
 109 /**
 110  * Read an image
 111  *
 112  */
 113
 114 static picture_t *ImageRead( image_handler_t *p_image, block_t *p_block,
 115                              video_format_t *p_fmt_in,
 116                              video_format_t *p_fmt_out )
 117 {
 118     picture_t *p_pic = NULL, *p_tmp;
 119
 120     /* Check if we can reuse the current decoder */
 121     if( p_image->p_dec &&
 122         p_image->p_dec->fmt_in.i_codec != p_fmt_in->i_chroma )
 123     {
 124         DeleteDecoder( p_image->p_dec );
 125         p_image->p_dec = 0;
 126     }
 127
 128     /* Start a decoder */
 129     if( !p_image->p_dec )
 130     {
 131         p_image->p_dec = CreateDecoder( p_image->p_parent, p_fmt_in );
 132         if( !p_image->p_dec ) return NULL;
 133     }
 134
 135     p_block->i_pts = p_block->i_dts = mdate();
 136     while( (p_tmp = p_image->p_dec->pf_decode_video( p_image->p_dec, &p_block ))
 137              != NULL )
 138     {
 139         if ( p_pic != NULL )
 140             p_pic->pf_release( p_pic );
 141         p_pic = p_tmp;
 142     }
 143
 144     if( p_pic == NULL )
 145     {
 146         msg_Warn( p_image->p_parent, "no image decoded" );
 147         return 0;
 148     }
 149
 150     if( !p_fmt_out->i_chroma )
 151         p_fmt_out->i_chroma = p_image->p_dec->fmt_out.video.i_chroma;
 152     if( !p_fmt_out->i_width && p_fmt_out->i_height )
 153         p_fmt_out->i_width = p_fmt_out->i_height
 154                               * p_image->p_dec->fmt_out.video.i_aspect
 155                               / VOUT_ASPECT_FACTOR;
 156     if( !p_fmt_out->i_height && p_fmt_out->i_width )
 157         p_fmt_out->i_height = p_fmt_out->i_width * VOUT_ASPECT_FACTOR
 158                                / p_image->p_dec->fmt_out.video.i_aspect;
 159     if( !p_fmt_out->i_width )
 160         p_fmt_out->i_width = p_image->p_dec->fmt_out.video.i_width;
 161     if( !p_fmt_out->i_height )
 162         p_fmt_out->i_height = p_image->p_dec->fmt_out.video.i_height;
 163
 164     /* Check if we need chroma conversion or resizing */
 165     if( p_image->p_dec->fmt_out.video.i_chroma != p_fmt_out->i_chroma ||
 166         p_image->p_dec->fmt_out.video.i_width != p_fmt_out->i_width ||
 167         p_image->p_dec->fmt_out.video.i_height != p_fmt_out->i_height )
 168     {
 169         if( p_image->p_filter )
 170         if( p_image->p_filter->fmt_in.video.i_chroma !=
 171             p_image->p_dec->fmt_out.video.i_chroma ||
 172             p_image->p_filter->fmt_out.video.i_chroma != p_fmt_out->i_chroma )
 173         {
 174             /* We need to restart a new filter */
 175             DeleteFilter( p_image->p_filter );
 176             p_image->p_filter = 0;
 177         }
 178
 179         /* Start a filter */
 180         if( !p_image->p_filter )
 181         {
 182             p_image->p_filter =
 183                 CreateFilter( p_image->p_parent, &p_image->p_dec->fmt_out,
 184                               p_fmt_out, NULL );
 185
 186             if( !p_image->p_filter )
 187             {
 188                 p_pic->pf_release( p_pic );
 189                 return NULL;
 190             }
 191         }
 192         else
 193         {
 194             /* Filters should handle on-the-fly size changes */
 195             p_image->p_filter->fmt_in = p_image->p_dec->fmt_out;
 196             p_image->p_filter->fmt_out = p_image->p_dec->fmt_out;
 197             p_image->p_filter->fmt_out.i_codec = p_fmt_out->i_chroma;
 198             p_image->p_filter->fmt_out.video = *p_fmt_out;
 199         }
 200
 201         p_pic = p_image->p_filter->pf_video_filter( p_image->p_filter, p_pic );
 202         *p_fmt_out = p_image->p_filter->fmt_out.video;
 203     }
 204     else *p_fmt_out = p_image->p_dec->fmt_out.video;
 205
 206     return p_pic;
 207 }
 208
 209 static picture_t *ImageReadUrl( image_handler_t *p_image, const char *psz_url,
 210                                 video_format_t *p_fmt_in,
 211                                 video_format_t *p_fmt_out )
 212 {
 213     block_t *p_block;
 214     picture_t *p_pic;
 215     stream_t *p_stream = NULL;
 216     int i_size;
 217
 218     p_stream = stream_UrlNew( p_image->p_parent, psz_url );
 219
 220     if( !p_stream )
 221     {
 222         msg_Dbg( p_image->p_parent, "could not open %s for reading",
 223                  psz_url );
 224         return NULL;
 225     }
 226
 227     i_size = stream_Size( p_stream );
 228
 229     p_block = block_New( p_image->p_parent, i_size );
 230
 231     stream_Read( p_stream, p_block->p_buffer, i_size );
 232     stream_Delete( p_stream );
 233
 234     if( !p_fmt_in->i_chroma )
 235     {
 236         /* Try to guess format from file name */
 237         p_fmt_in->i_chroma = Ext2Fourcc( psz_url );
 238     }
 239
 240     p_pic = ImageRead( p_image, p_block, p_fmt_in, p_fmt_out );
 241
 242     return p_pic;
 243 }
 244
 245 /**
 246  * Write an image
 247  *
 248  */
 249
 250 static void PicRelease( picture_t *p_pic ) { (void)p_pic; }
 251
 252 static block_t *ImageWrite( image_handler_t *p_image, picture_t *p_pic,
 253                             video_format_t *p_fmt_in,
 254                             video_format_t *p_fmt_out )
 255 {
 256     block_t *p_block;
 257     void (*pf_release)( picture_t * );
 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         pf_release = p_pic->pf_release;
 320         p_pic->pf_release = PicRelease; /* Small hack */
 321         p_tmp_pic =
 322             p_image->p_filter->pf_video_filter( p_image->p_filter, p_pic );
 323         p_pic->pf_release = pf_release;
 324
 325         p_block = p_image->p_enc->pf_encode_video( p_image->p_enc, p_tmp_pic );
 326
 327         p_image->p_filter->pf_vout_buffer_del( p_image->p_filter, p_tmp_pic );
 328     }
 329     else
 330     {
 331         p_block = p_image->p_enc->pf_encode_video( p_image->p_enc, p_pic );
 332     }
 333
 334     if( !p_block )
 335     {
 336         msg_Dbg( p_image->p_parent, "no image encoded" );
 337         return 0;
 338     }
 339
 340     return p_block;
 341 }
 342
 343 static int ImageWriteUrl( image_handler_t *p_image, picture_t *p_pic,
 344                           video_format_t *p_fmt_in, video_format_t *p_fmt_out,
 345                           const char *psz_url )
 346 {
 347     block_t *p_block;
 348     FILE *file;
 349
 350     if( !p_fmt_out->i_chroma )
 351     {
 352         /* Try to guess format from file name */
 353         p_fmt_out->i_chroma = Ext2Fourcc( psz_url );
 354     }
 355
 356     file = utf8_fopen( psz_url, "wb" );
 357     if( !file )
 358     {
 359         msg_Err( p_image->p_parent, "%s: %m", psz_url );
 360         return VLC_EGENERIC;
 361     }
 362
 363     p_block = ImageWrite( p_image, p_pic, p_fmt_in, p_fmt_out );
 364
 365     int err = 0;
 366     if( p_block )
 367     {
 368         if( fwrite( p_block->p_buffer, p_block->i_buffer, 1, file ) != 1 )
 369             err = errno;
 370         block_Release( p_block );
 371     }
 372
 373     if( fclose( file ) && !err )
 374         err = errno;
 375
 376     if( err )
 377     {
 378        errno = err;
 379        msg_Err( p_image->p_parent, "%s: %m", psz_url );
 380     }
 381
 382     return err ? VLC_EGENERIC : VLC_SUCCESS;
 383 }
 384
 385 /**
 386  * Convert an image to a different format
 387  *
 388  */
 389
 390 static picture_t *ImageConvert( image_handler_t *p_image, picture_t *p_pic,
 391                                 video_format_t *p_fmt_in,
 392                                 video_format_t *p_fmt_out )
 393 {
 394     void (*pf_release)( picture_t * );
 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     pf_release = p_pic->pf_release;
 452     p_pic->pf_release = PicRelease; /* Small hack */
 453     p_pif = p_image->p_filter->pf_video_filter( p_image->p_filter, p_pic );
 454     p_pic->pf_release = pf_release;
 455
 456     if( p_fmt_in->i_chroma == p_fmt_out->i_chroma &&
 457         p_fmt_in->i_width == p_fmt_out->i_width &&
 458         p_fmt_in->i_height == p_fmt_out->i_height )
 459     {
 460         /* Duplicate image */
 461         p_pif->pf_release( p_pif ); /* XXX: Better fix must be possible */
 462         p_pif = p_image->p_filter->pf_vout_buffer_new( p_image->p_filter );
 463         if( p_pif ) vout_CopyPicture( p_image->p_parent, p_pif, p_pic );
 464     }
 465
 466     return p_pif;
 467 }
 468
 469 /**
 470  * Filter an image with a psz_module filter
 471  *
 472  */
 473
 474 static picture_t *ImageFilter( image_handler_t *p_image, picture_t *p_pic,
 475                                video_format_t *p_fmt, const char *psz_module )
 476 {
 477     void (*pf_release)( picture_t * );
 478     picture_t *p_pif;
 479
 480     /* Start a filter */
 481     if( !p_image->p_filter )
 482     {
 483         es_format_t fmt;
 484         es_format_Init( &fmt, VIDEO_ES, p_fmt->i_chroma );
 485         fmt.video = *p_fmt;
 486
 487         p_image->p_filter =
 488             CreateFilter( p_image->p_parent, &fmt, &fmt.video, psz_module );
 489
 490         if( !p_image->p_filter )
 491         {
 492             return NULL;
 493         }
 494     }
 495     else
 496     {
 497         /* Filters should handle on-the-fly size changes */
 498         p_image->p_filter->fmt_in.video = *p_fmt;
 499         p_image->p_filter->fmt_out.video = *p_fmt;
 500     }
 501
 502     pf_release = p_pic->pf_release;
 503     p_pic->pf_release = PicRelease; /* Small hack */
 504     p_pif = p_image->p_filter->pf_video_filter( p_image->p_filter, p_pic );
 505     p_pic->pf_release = pf_release;
 506
 507     return p_pif;
 508 }
 509
 510 /**
 511  * Misc functions
 512  *
 513  */
 514 static struct
 515 {
 516     vlc_fourcc_t i_codec;
 517     const char *psz_ext;
 518
 519 } ext_table[] =
 520 {
 521     { VLC_FOURCC('j','p','e','g'), "jpeg" },
 522     { VLC_FOURCC('j','p','e','g'), "jpg"  },
 523     { VLC_FOURCC('l','j','p','g'), "ljpg" },
 524     { VLC_FOURCC('p','n','g',' '), "png" },
 525     { VLC_FOURCC('p','g','m',' '), "pgm" },
 526     { VLC_FOURCC('p','g','m','y'), "pgmyuv" },
 527     { VLC_FOURCC('p','b','m',' '), "pbm" },
 528     { VLC_FOURCC('p','a','m',' '), "pam" },
 529     { VLC_FOURCC('t','g','a',' '), "tga" },
 530     { VLC_FOURCC('b','m','p',' '), "bmp" },
 531     { VLC_FOURCC('p','n','m',' '), "pnm" },
 532     { VLC_FOURCC('x','p','m',' '), "xpm" },
 533     { VLC_FOURCC('x','c','f',' '), "xcf" },
 534     { VLC_FOURCC('p','c','x',' '), "pcx" },
 535     { VLC_FOURCC('g','i','f',' '), "gif" },
 536     { VLC_FOURCC('t','i','f','f'), "tif" },
 537     { VLC_FOURCC('t','i','f','f'), "tiff" },
 538     { VLC_FOURCC('l','b','m',' '), "lbm" },
 539     { 0, NULL }
 540 };
 541
 542 static vlc_fourcc_t Ext2Fourcc( const char *psz_name )
 543 {
 544     int i;
 545
 546     psz_name = strrchr( psz_name, '.' );
 547     if( !psz_name ) return 0;
 548     psz_name++;
 549
 550     for( i = 0; ext_table[i].i_codec; i++ )
 551     {
 552         int j;
 553         for( j = 0; toupper(ext_table[i].psz_ext[j]) == toupper(psz_name[j]);
 554              j++ )
 555         {
 556             if( !ext_table[i].psz_ext[j] && !psz_name[j] )
 557                 return ext_table[i].i_codec;
 558         }
 559     }
 560
 561     return 0;
 562 }
 563
 564 /*
 565 static const char *Fourcc2Ext( vlc_fourcc_t i_codec )
 566 {
 567     int i;
 568
 569     for( i = 0; ext_table[i].i_codec != 0; i++ )
 570     {
 571         if( ext_table[i].i_codec == i_codec ) return ext_table[i].psz_ext;
 572     }
 573
 574     return NULL;
 575 }
 576 */
 577
 578 static void video_release_buffer( picture_t *p_pic )
 579 {
 580     if( p_pic )
 581     {
 582         free( p_pic->p_data_orig );
 583         free( p_pic->p_sys );
 584         free( p_pic );
 585     }
 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->pf_release = video_release_buffer;
 606     p_pic->i_status = RESERVED_PICTURE;
 607     p_pic->p_sys = NULL;
 608
 609     return p_pic;
 610 }
 611
 612 static void video_del_buffer( decoder_t *p_dec, picture_t *p_pic )
 613 {
 614     (void)p_dec;
 615     if( p_pic )
 616     {
 617         free( p_pic->p_data_orig );
 618         free( p_pic->p_sys );
 619         free( p_pic );
 620     }
 621 }
 622
 623 static void video_link_picture( decoder_t *p_dec, picture_t *p_pic )
 624 {
 625     (void)p_dec; (void)p_pic;
 626 }
 627
 628 static void video_unlink_picture( decoder_t *p_dec, picture_t *p_pic )
 629 {
 630     (void)p_dec; (void)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     {
 640         msg_Err( p_this, "out of memory" );
 641         return NULL;
 642     }
 643
 644     p_dec->p_module = NULL;
 645     es_format_Init( &p_dec->fmt_in, VIDEO_ES, fmt->i_chroma );
 646     es_format_Init( &p_dec->fmt_out, VIDEO_ES, 0 );
 647     p_dec->fmt_in.video = *fmt;
 648     p_dec->b_pace_control = VLC_TRUE;
 649
 650     p_dec->pf_vout_buffer_new = video_new_buffer;
 651     p_dec->pf_vout_buffer_del = video_del_buffer;
 652     p_dec->pf_picture_link    = video_link_picture;
 653     p_dec->pf_picture_unlink  = video_unlink_picture;
 654
 655     vlc_object_attach( p_dec, p_this );
 656
 657     /* Find a suitable decoder module */
 658     p_dec->p_module = module_Need( p_dec, "decoder", "$codec", 0 );
 659     if( !p_dec->p_module )
 660     {
 661         msg_Err( p_dec, "no suitable decoder module for fourcc `%4.4s'.\n"
 662                  "VLC probably does not support this image format.",
 663                  (char*)&p_dec->fmt_in.i_codec );
 664
 665         DeleteDecoder( p_dec );
 666         return NULL;
 667     }
 668
 669     return p_dec;
 670 }
 671
 672 static void DeleteDecoder( decoder_t * p_dec )
 673 {
 674     vlc_object_detach( p_dec );
 675
 676     if( p_dec->p_module ) module_Unneed( p_dec, p_dec->p_module );
 677
 678     es_format_Clean( &p_dec->fmt_in );
 679     es_format_Clean( &p_dec->fmt_out );
 680
 681     vlc_object_release( p_dec );
 682     p_dec = NULL;
 683 }
 684
 685 static encoder_t *CreateEncoder( vlc_object_t *p_this, video_format_t *fmt_in,
 686                                  video_format_t *fmt_out )
 687 {
 688     encoder_t *p_enc;
 689
 690     p_enc = vlc_object_create( p_this, VLC_OBJECT_ENCODER );
 691     if( p_enc == NULL )
 692     {
 693         msg_Err( p_this, "out of memory" );
 694         return NULL;
 695     }
 696
 697     p_enc->p_module = NULL;
 698     es_format_Init( &p_enc->fmt_in, VIDEO_ES, fmt_in->i_chroma );
 699     p_enc->fmt_in.video = *fmt_in;
 700     if( fmt_out->i_width > 0 && fmt_out->i_height > 0 )
 701     {
 702         p_enc->fmt_in.video.i_width = fmt_out->i_width;
 703         p_enc->fmt_in.video.i_height = fmt_out->i_height;
 704
 705         if( fmt_out->i_visible_width > 0 &&
 706             fmt_out->i_visible_height > 0 )
 707         {
 708             p_enc->fmt_in.video.i_visible_width = fmt_out->i_visible_width;
 709             p_enc->fmt_in.video.i_visible_height = fmt_out->i_visible_height;
 710         }
 711         else
 712         {
 713             p_enc->fmt_in.video.i_visible_width = fmt_out->i_width;
 714             p_enc->fmt_in.video.i_visible_height = fmt_out->i_height;
 715         }
 716     }
 717     else if( fmt_out->i_sar_num && fmt_out->i_sar_den &&
 718              fmt_out->i_sar_num * fmt_in->i_sar_den !=
 719              fmt_out->i_sar_den * fmt_in->i_sar_num )
 720     {
 721         p_enc->fmt_in.video.i_width =
 722             fmt_in->i_sar_num * (int64_t)fmt_out->i_sar_den * fmt_in->i_width /
 723             fmt_in->i_sar_den / fmt_out->i_sar_num;
 724         p_enc->fmt_in.video.i_visible_width =
 725             fmt_in->i_sar_num * (int64_t)fmt_out->i_sar_den *
 726             fmt_in->i_visible_width / fmt_in->i_sar_den / fmt_out->i_sar_num;
 727     }
 728
 729     p_enc->fmt_in.video.i_frame_rate = 25;
 730     p_enc->fmt_in.video.i_frame_rate_base = 1;
 731
 732     es_format_Init( &p_enc->fmt_out, VIDEO_ES, fmt_out->i_chroma );
 733     p_enc->fmt_out.video = *fmt_out;
 734     p_enc->fmt_out.video.i_width = p_enc->fmt_in.video.i_width;
 735     p_enc->fmt_out.video.i_height = p_enc->fmt_in.video.i_height;
 736
 737     vlc_object_attach( p_enc, p_this );
 738
 739     /* Find a suitable decoder module */
 740     p_enc->p_module = module_Need( p_enc, "encoder", 0, 0 );
 741     if( !p_enc->p_module )
 742     {
 743         msg_Err( p_enc, "no suitable encoder module for fourcc `%4.4s'.\n"
 744                  "VLC probably does not support this image format.",
 745                  (char*)&p_enc->fmt_out.i_codec );
 746
 747         DeleteEncoder( p_enc );
 748         return NULL;
 749     }
 750     p_enc->fmt_in.video.i_chroma = p_enc->fmt_in.i_codec;
 751
 752     return p_enc;
 753 }
 754
 755 static void DeleteEncoder( encoder_t * p_enc )
 756 {
 757     vlc_object_detach( p_enc );
 758
 759     if( p_enc->p_module ) module_Unneed( p_enc, p_enc->p_module );
 760
 761     es_format_Clean( &p_enc->fmt_in );
 762     es_format_Clean( &p_enc->fmt_out );
 763
 764     vlc_object_release( p_enc );
 765     p_enc = NULL;
 766 }
 767
 768 static filter_t *CreateFilter( vlc_object_t *p_this, es_format_t *p_fmt_in,
 769                                video_format_t *p_fmt_out,
 770                                const char *psz_module )
 771 {
 772     filter_t *p_filter;
 773
 774     p_filter = vlc_object_create( p_this, VLC_OBJECT_FILTER );
 775     vlc_object_attach( p_filter, p_this );
 776
 777     p_filter->pf_vout_buffer_new =
 778         (picture_t *(*)(filter_t *))video_new_buffer;
 779     p_filter->pf_vout_buffer_del =
 780         (void (*)(filter_t *, picture_t *))video_del_buffer;
 781
 782     p_filter->fmt_in = *p_fmt_in;
 783     p_filter->fmt_out = *p_fmt_in;
 784     p_filter->fmt_out.i_codec = p_fmt_out->i_chroma;
 785     p_filter->fmt_out.video = *p_fmt_out;
 786     p_filter->p_module = module_Need( p_filter, "video filter2",
 787                                       psz_module, 0 );
 788
 789     if( !p_filter->p_module )
 790     {
 791         msg_Dbg( p_filter, "no video filter found" );
 792         DeleteFilter( p_filter );
 793         return NULL;
 794     }
 795
 796     return p_filter;
 797 }
 798
 799 static void DeleteFilter( filter_t * p_filter )
 800 {
 801     vlc_object_detach( p_filter );
 802
 803     if( p_filter->p_module ) module_Unneed( p_filter, p_filter->p_module );
 804
 805     es_format_Clean( &p_filter->fmt_in );
 806     es_format_Clean( &p_filter->fmt_out );
 807
 808     vlc_object_release( p_filter );
 809     p_filter = NULL;
 810 }