git.sesse.net Git - vlc/blob - src/misc/image.c

   1 /*****************************************************************************
   2  * image.c : wrapper for image reading/writing facilities
   3  *****************************************************************************
   4  * Copyright (C) 2004-2007 the VideoLAN team
   5  * $Id$
   6  *
   7  * Author: Gildas Bazin <gbazin@videolan.org>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  22  *****************************************************************************/
  23
  24 /**
  25  * \file
  26  * This file contains the functions to handle the image_handler_t type
  27  */
  28
  29 /*****************************************************************************
  30  * Preamble
  31  *****************************************************************************/
  32
  33 #ifdef HAVE_CONFIG_H
  34 # include "config.h"
  35 #endif
  36
  37 #include <ctype.h>
  38 #include <errno.h>
  39
  40 #include <vlc_common.h>
  41 #include <vlc_codec.h>
  42 #include <vlc_meta.h>
  43 #include <vlc_filter.h>
  44 #include <vlc_es.h>
  45 #include <vlc_image.h>
  46 #include <vlc_stream.h>
  47 #include <vlc_charset.h>
  48 #include <vlc_sout.h>
  49 #include <libvlc.h>
  50
  51 static picture_t *ImageRead( image_handler_t *, block_t *,
  52                              video_format_t *, video_format_t * );
  53 static picture_t *ImageReadUrl( image_handler_t *, const char *,
  54                                 video_format_t *, video_format_t * );
  55 static block_t *ImageWrite( image_handler_t *, picture_t *,
  56                             video_format_t *, video_format_t * );
  57 static int ImageWriteUrl( image_handler_t *, picture_t *,
  58                           video_format_t *, video_format_t *, const char * );
  59
  60 static picture_t *ImageConvert( image_handler_t *, picture_t *,
  61                                 video_format_t *, video_format_t * );
  62 static picture_t *ImageFilter( image_handler_t *, picture_t *,
  63                                video_format_t *, const char *psz_module );
  64
  65 static decoder_t *CreateDecoder( vlc_object_t *, video_format_t * );
  66 static void DeleteDecoder( decoder_t * );
  67 static encoder_t *CreateEncoder( vlc_object_t *, video_format_t *,
  68                                  video_format_t * );
  69 static void DeleteEncoder( encoder_t * );
  70 static filter_t *CreateFilter( vlc_object_t *, es_format_t *,
  71                                video_format_t *, const char * );
  72 static void DeleteFilter( filter_t * );
  73
  74 vlc_fourcc_t image_Type2Fourcc( const char * );
  75 vlc_fourcc_t image_Ext2Fourcc( const char * );
  76 /*static const char *Fourcc2Ext( vlc_fourcc_t );*/
  77
  78 /**
  79  * Create an image_handler_t instance
  80  *
  81  */
  82 image_handler_t *__image_HandlerCreate( vlc_object_t *p_this )
  83 {
  84     image_handler_t *p_image = calloc( 1, sizeof(image_handler_t) );
  85     if( !p_image )
  86         return NULL;
  87
  88     p_image->p_parent = p_this;
  89
  90     p_image->pf_read = ImageRead;
  91     p_image->pf_read_url = ImageReadUrl;
  92     p_image->pf_write = ImageWrite;
  93     p_image->pf_write_url = ImageWriteUrl;
  94     p_image->pf_convert = ImageConvert;
  95     p_image->pf_filter = ImageFilter;
  96
  97     return p_image;
  98 }
  99
 100 /**
 101  * Delete the image_handler_t instance
 102  *
 103  */
 104 void image_HandlerDelete( image_handler_t *p_image )
 105 {
 106     if( !p_image ) return;
 107
 108     if( p_image->p_dec ) DeleteDecoder( p_image->p_dec );
 109     if( p_image->p_enc ) DeleteEncoder( p_image->p_enc );
 110     if( p_image->p_filter ) DeleteFilter( p_image->p_filter );
 111
 112     free( p_image );
 113     p_image = NULL;
 114 }
 115
 116 /**
 117  * Read an image
 118  *
 119  */
 120
 121 static picture_t *ImageRead( image_handler_t *p_image, block_t *p_block,
 122                              video_format_t *p_fmt_in,
 123                              video_format_t *p_fmt_out )
 124 {
 125     picture_t *p_pic = NULL, *p_tmp;
 126
 127     /* Check if we can reuse the current decoder */
 128     if( p_image->p_dec &&
 129         p_image->p_dec->fmt_in.i_codec != p_fmt_in->i_chroma )
 130     {
 131         DeleteDecoder( p_image->p_dec );
 132         p_image->p_dec = 0;
 133     }
 134
 135     /* Start a decoder */
 136     if( !p_image->p_dec )
 137     {
 138         p_image->p_dec = CreateDecoder( p_image->p_parent, p_fmt_in );
 139         if( !p_image->p_dec ) return NULL;
 140     }
 141
 142     p_block->i_pts = p_block->i_dts = mdate();
 143     while( (p_tmp = p_image->p_dec->pf_decode_video( p_image->p_dec, &p_block ))
 144              != NULL )
 145     {
 146         if( p_pic != NULL )
 147             picture_Release( p_pic );
 148         p_pic = p_tmp;
 149     }
 150
 151     if( p_pic == NULL )
 152     {
 153         msg_Warn( p_image->p_parent, "no image decoded" );
 154         return 0;
 155     }
 156
 157     if( !p_fmt_out->i_chroma )
 158         p_fmt_out->i_chroma = p_image->p_dec->fmt_out.video.i_chroma;
 159     if( !p_fmt_out->i_width && p_fmt_out->i_height )
 160         p_fmt_out->i_width = (int64_t)p_image->p_dec->fmt_out.video.i_width *
 161                              p_image->p_dec->fmt_out.video.i_sar_num *
 162                              p_fmt_out->i_height /
 163                              p_image->p_dec->fmt_out.video.i_height /
 164                              p_image->p_dec->fmt_out.video.i_sar_den;
 165
 166     if( !p_fmt_out->i_height && p_fmt_out->i_width )
 167         p_fmt_out->i_height = (int64_t)p_image->p_dec->fmt_out.video.i_height *
 168                               p_image->p_dec->fmt_out.video.i_sar_den *
 169                               p_fmt_out->i_width /
 170                               p_image->p_dec->fmt_out.video.i_width /
 171                               p_image->p_dec->fmt_out.video.i_sar_num;
 172     if( !p_fmt_out->i_width )
 173         p_fmt_out->i_width = p_image->p_dec->fmt_out.video.i_width;
 174     if( !p_fmt_out->i_height )
 175         p_fmt_out->i_height = p_image->p_dec->fmt_out.video.i_height;
 176
 177     /* Check if we need chroma conversion or resizing */
 178     if( p_image->p_dec->fmt_out.video.i_chroma != p_fmt_out->i_chroma ||
 179         p_image->p_dec->fmt_out.video.i_width != p_fmt_out->i_width ||
 180         p_image->p_dec->fmt_out.video.i_height != p_fmt_out->i_height )
 181     {
 182         if( p_image->p_filter )
 183         if( p_image->p_filter->fmt_in.video.i_chroma !=
 184             p_image->p_dec->fmt_out.video.i_chroma ||
 185             p_image->p_filter->fmt_out.video.i_chroma != p_fmt_out->i_chroma )
 186         {
 187             /* We need to restart a new filter */
 188             DeleteFilter( p_image->p_filter );
 189             p_image->p_filter = 0;
 190         }
 191
 192         /* Start a filter */
 193         if( !p_image->p_filter )
 194         {
 195             p_image->p_filter =
 196                 CreateFilter( p_image->p_parent, &p_image->p_dec->fmt_out,
 197                               p_fmt_out, NULL );
 198
 199             if( !p_image->p_filter )
 200             {
 201                 picture_Release( p_pic );
 202                 return NULL;
 203             }
 204         }
 205         else
 206         {
 207             /* Filters should handle on-the-fly size changes */
 208             p_image->p_filter->fmt_in = p_image->p_dec->fmt_out;
 209             p_image->p_filter->fmt_out = p_image->p_dec->fmt_out;
 210             p_image->p_filter->fmt_out.i_codec = p_fmt_out->i_chroma;
 211             p_image->p_filter->fmt_out.video = *p_fmt_out;
 212         }
 213
 214         p_pic = p_image->p_filter->pf_video_filter( p_image->p_filter, p_pic );
 215         *p_fmt_out = p_image->p_filter->fmt_out.video;
 216     }
 217     else *p_fmt_out = p_image->p_dec->fmt_out.video;
 218
 219     return p_pic;
 220 }
 221
 222 static picture_t *ImageReadUrl( image_handler_t *p_image, const char *psz_url,
 223                                 video_format_t *p_fmt_in,
 224                                 video_format_t *p_fmt_out )
 225 {
 226     block_t *p_block;
 227     picture_t *p_pic;
 228     stream_t *p_stream = NULL;
 229     int i_size;
 230
 231     p_stream = stream_UrlNew( p_image->p_parent, psz_url );
 232
 233     if( !p_stream )
 234     {
 235         msg_Dbg( p_image->p_parent, "could not open %s for reading",
 236                  psz_url );
 237         return NULL;
 238     }
 239
 240     i_size = stream_Size( p_stream );
 241
 242     p_block = block_New( p_image->p_parent, i_size );
 243
 244     stream_Read( p_stream, p_block->p_buffer, i_size );
 245
 246     if( !p_fmt_in->i_chroma )
 247     {
 248         char *psz_mime = NULL;
 249         stream_Control( p_stream, STREAM_GET_CONTENT_TYPE, &psz_mime );
 250         if( psz_mime )
 251             p_fmt_in->i_chroma = image_Mime2Fourcc( psz_mime );
 252         free( psz_mime );
 253     }
 254     stream_Delete( p_stream );
 255
 256     if( !p_fmt_in->i_chroma )
 257     {
 258         /* Try to guess format from file name */
 259         p_fmt_in->i_chroma = image_Ext2Fourcc( psz_url );
 260     }
 261
 262     p_pic = ImageRead( p_image, p_block, p_fmt_in, p_fmt_out );
 263
 264     return p_pic;
 265 }
 266
 267 /**
 268  * Write an image
 269  *
 270  */
 271
 272 static block_t *ImageWrite( image_handler_t *p_image, picture_t *p_pic,
 273                             video_format_t *p_fmt_in,
 274                             video_format_t *p_fmt_out )
 275 {
 276     block_t *p_block;
 277
 278     /* Check if we can reuse the current encoder */
 279     if( p_image->p_enc &&
 280         ( p_image->p_enc->fmt_out.i_codec != p_fmt_out->i_chroma ||
 281           p_image->p_enc->fmt_out.video.i_width != p_fmt_out->i_width ||
 282           p_image->p_enc->fmt_out.video.i_height != p_fmt_out->i_height ) )
 283     {
 284         DeleteEncoder( p_image->p_enc );
 285         p_image->p_enc = 0;
 286     }
 287
 288     /* Start an encoder */
 289     if( !p_image->p_enc )
 290     {
 291         p_image->p_enc = CreateEncoder( p_image->p_parent,
 292                                         p_fmt_in, p_fmt_out );
 293         if( !p_image->p_enc ) return NULL;
 294     }
 295
 296     /* Check if we need chroma conversion or resizing */
 297     if( p_image->p_enc->fmt_in.video.i_chroma != p_fmt_in->i_chroma ||
 298         p_image->p_enc->fmt_in.video.i_width != p_fmt_in->i_width ||
 299         p_image->p_enc->fmt_in.video.i_height != p_fmt_in->i_height )
 300     {
 301         picture_t *p_tmp_pic;
 302
 303         if( p_image->p_filter )
 304         if( p_image->p_filter->fmt_in.video.i_chroma != p_fmt_in->i_chroma ||
 305             p_image->p_filter->fmt_out.video.i_chroma !=
 306             p_image->p_enc->fmt_in.video.i_chroma )
 307         {
 308             /* We need to restart a new filter */
 309             DeleteFilter( p_image->p_filter );
 310             p_image->p_filter = 0;
 311         }
 312
 313         /* Start a filter */
 314         if( !p_image->p_filter )
 315         {
 316             es_format_t fmt_in;
 317             es_format_Init( &fmt_in, VIDEO_ES, p_fmt_in->i_chroma );
 318             fmt_in.video = *p_fmt_in;
 319
 320             p_image->p_filter =
 321                 CreateFilter( p_image->p_parent, &fmt_in,
 322                               &p_image->p_enc->fmt_in.video, NULL );
 323
 324             if( !p_image->p_filter )
 325             {
 326                 return NULL;
 327             }
 328         }
 329         else
 330         {
 331             /* Filters should handle on-the-fly size changes */
 332             p_image->p_filter->fmt_in.i_codec = p_fmt_in->i_chroma;
 333             p_image->p_filter->fmt_out.video = *p_fmt_in;
 334             p_image->p_filter->fmt_out.i_codec =p_image->p_enc->fmt_in.i_codec;
 335             p_image->p_filter->fmt_out.video = p_image->p_enc->fmt_in.video;
 336         }
 337
 338         picture_Hold( p_pic );
 339
 340         p_tmp_pic =
 341             p_image->p_filter->pf_video_filter( p_image->p_filter, p_pic );
 342
 343         p_block = p_image->p_enc->pf_encode_video( p_image->p_enc, p_tmp_pic );
 344
 345         p_image->p_filter->pf_vout_buffer_del( p_image->p_filter, p_tmp_pic );
 346     }
 347     else
 348     {
 349         p_block = p_image->p_enc->pf_encode_video( p_image->p_enc, p_pic );
 350     }
 351
 352     if( !p_block )
 353     {
 354         msg_Dbg( p_image->p_parent, "no image encoded" );
 355         return 0;
 356     }
 357
 358     return p_block;
 359 }
 360
 361 static int ImageWriteUrl( image_handler_t *p_image, picture_t *p_pic,
 362                           video_format_t *p_fmt_in, video_format_t *p_fmt_out,
 363                           const char *psz_url )
 364 {
 365     block_t *p_block;
 366     FILE *file;
 367
 368     if( !p_fmt_out->i_chroma )
 369     {
 370         /* Try to guess format from file name */
 371         p_fmt_out->i_chroma = image_Ext2Fourcc( psz_url );
 372     }
 373
 374     file = utf8_fopen( psz_url, "wb" );
 375     if( !file )
 376     {
 377         msg_Err( p_image->p_parent, "%s: %m", psz_url );
 378         return VLC_EGENERIC;
 379     }
 380
 381     p_block = ImageWrite( p_image, p_pic, p_fmt_in, p_fmt_out );
 382
 383     int err = 0;
 384     if( p_block )
 385     {
 386         if( fwrite( p_block->p_buffer, p_block->i_buffer, 1, file ) != 1 )
 387             err = errno;
 388         block_Release( p_block );
 389     }
 390
 391     if( fclose( file ) && !err )
 392         err = errno;
 393
 394     if( err )
 395     {
 396        errno = err;
 397        msg_Err( p_image->p_parent, "%s: %m", psz_url );
 398     }
 399
 400     return err ? VLC_EGENERIC : VLC_SUCCESS;
 401 }
 402
 403 /**
 404  * Convert an image to a different format
 405  *
 406  */
 407
 408 static picture_t *ImageConvert( image_handler_t *p_image, picture_t *p_pic,
 409                                 video_format_t *p_fmt_in,
 410                                 video_format_t *p_fmt_out )
 411 {
 412     picture_t *p_pif;
 413
 414     if( !p_fmt_out->i_width && !p_fmt_out->i_height &&
 415         p_fmt_out->i_sar_num && p_fmt_out->i_sar_den &&
 416         p_fmt_out->i_sar_num * p_fmt_in->i_sar_den !=
 417         p_fmt_out->i_sar_den * p_fmt_in->i_sar_num )
 418     {
 419         p_fmt_out->i_width =
 420             p_fmt_in->i_sar_num * (int64_t)p_fmt_out->i_sar_den *
 421             p_fmt_in->i_width / p_fmt_in->i_sar_den / p_fmt_out->i_sar_num;
 422         p_fmt_out->i_visible_width =
 423             p_fmt_in->i_sar_num * (int64_t)p_fmt_out->i_sar_den *
 424             p_fmt_in->i_visible_width / p_fmt_in->i_sar_den /
 425             p_fmt_out->i_sar_num;
 426     }
 427
 428     if( !p_fmt_out->i_chroma ) p_fmt_out->i_chroma = p_fmt_in->i_chroma;
 429     if( !p_fmt_out->i_width )
 430         p_fmt_out->i_width = p_fmt_out->i_visible_width = p_fmt_in->i_width;
 431     if( !p_fmt_out->i_height )
 432         p_fmt_out->i_height = p_fmt_out->i_visible_height = p_fmt_in->i_height;
 433     if( !p_fmt_out->i_sar_num ) p_fmt_out->i_sar_num = p_fmt_in->i_sar_num;
 434     if( !p_fmt_out->i_sar_den ) p_fmt_out->i_sar_den = p_fmt_in->i_sar_den;
 435
 436     if( p_image->p_filter )
 437     if( p_image->p_filter->fmt_in.video.i_chroma != p_fmt_in->i_chroma ||
 438         p_image->p_filter->fmt_out.video.i_chroma != p_fmt_out->i_chroma )
 439     {
 440         /* We need to restart a new filter */
 441         DeleteFilter( p_image->p_filter );
 442         p_image->p_filter = NULL;
 443     }
 444
 445     /* Start a filter */
 446     if( !p_image->p_filter )
 447     {
 448         es_format_t fmt_in;
 449         es_format_Init( &fmt_in, VIDEO_ES, p_fmt_in->i_chroma );
 450         fmt_in.video = *p_fmt_in;
 451
 452         p_image->p_filter =
 453             CreateFilter( p_image->p_parent, &fmt_in, p_fmt_out, NULL );
 454
 455         if( !p_image->p_filter )
 456         {
 457             return NULL;
 458         }
 459     }
 460     else
 461     {
 462         /* Filters should handle on-the-fly size changes */
 463         p_image->p_filter->fmt_in.video = *p_fmt_in;
 464         p_image->p_filter->fmt_out.video = *p_fmt_out;
 465     }
 466
 467     picture_Hold( p_pic );
 468
 469     p_pif = p_image->p_filter->pf_video_filter( p_image->p_filter, p_pic );
 470
 471     if( p_fmt_in->i_chroma == p_fmt_out->i_chroma &&
 472         p_fmt_in->i_width == p_fmt_out->i_width &&
 473         p_fmt_in->i_height == p_fmt_out->i_height )
 474     {
 475         /* Duplicate image */
 476         picture_Release( p_pif ); /* XXX: Better fix must be possible */
 477         p_pif = p_image->p_filter->pf_vout_buffer_new( p_image->p_filter );
 478         if( p_pif )
 479             picture_Copy( p_pif, p_pic );
 480     }
 481
 482     return p_pif;
 483 }
 484
 485 /**
 486  * Filter an image with a psz_module filter
 487  *
 488  */
 489
 490 static picture_t *ImageFilter( image_handler_t *p_image, picture_t *p_pic,
 491                                video_format_t *p_fmt, const char *psz_module )
 492 {
 493     /* Start a filter */
 494     if( !p_image->p_filter )
 495     {
 496         es_format_t fmt;
 497         es_format_Init( &fmt, VIDEO_ES, p_fmt->i_chroma );
 498         fmt.video = *p_fmt;
 499
 500         p_image->p_filter =
 501             CreateFilter( p_image->p_parent, &fmt, &fmt.video, psz_module );
 502
 503         if( !p_image->p_filter )
 504         {
 505             return NULL;
 506         }
 507     }
 508     else
 509     {
 510         /* Filters should handle on-the-fly size changes */
 511         p_image->p_filter->fmt_in.video = *p_fmt;
 512         p_image->p_filter->fmt_out.video = *p_fmt;
 513     }
 514
 515     picture_Hold( p_pic );
 516
 517     return p_image->p_filter->pf_video_filter( p_image->p_filter, p_pic );
 518 }
 519
 520 /**
 521  * Misc functions
 522  *
 523  */
 524 static const struct
 525 {
 526     vlc_fourcc_t i_codec;
 527     const char *psz_ext;
 528
 529 } ext_table[] =
 530 {
 531     { VLC_CODEC_JPEG,              "jpeg" },
 532     { VLC_CODEC_JPEG,              "jpg"  },
 533     { VLC_CODEC_JPEGLS,            "ljpg" },
 534     { VLC_CODEC_PNG,               "png" },
 535     { VLC_CODEC_PGM,               "pgm" },
 536     { VLC_CODEC_PGMYUV,            "pgmyuv" },
 537     { VLC_FOURCC('p','b','m',' '), "pbm" },
 538     { VLC_FOURCC('p','a','m',' '), "pam" },
 539     { VLC_CODEC_TARGA,             "tga" },
 540     { VLC_CODEC_BMP,               "bmp" },
 541     { VLC_CODEC_PNM,               "pnm" },
 542     { VLC_FOURCC('x','p','m',' '), "xpm" },
 543     { VLC_FOURCC('x','c','f',' '), "xcf" },
 544     { VLC_CODEC_PCX,               "pcx" },
 545     { VLC_CODEC_GIF,               "gif" },
 546     { VLC_CODEC_TIFF,              "tif" },
 547     { VLC_CODEC_TIFF,              "tiff" },
 548     { VLC_FOURCC('l','b','m',' '), "lbm" },
 549     { VLC_CODEC_PPM,               "ppm" },
 550     { 0, NULL }
 551 };
 552
 553 vlc_fourcc_t image_Type2Fourcc( const char *psz_type )
 554 {
 555     int i;
 556
 557     for( i = 0; ext_table[i].i_codec; i++ )
 558         if( !strcasecmp( ext_table[i].psz_ext, psz_type ) )
 559             return ext_table[i].i_codec;
 560
 561     return 0;
 562 }
 563
 564 vlc_fourcc_t image_Ext2Fourcc( const char *psz_name )
 565 {
 566     psz_name = strrchr( psz_name, '.' );
 567     if( !psz_name ) return 0;
 568     psz_name++;
 569
 570     return image_Type2Fourcc( psz_name );
 571 }
 572
 573 /*
 574 static const char *Fourcc2Ext( vlc_fourcc_t i_codec )
 575 {
 576     int i;
 577
 578     for( i = 0; ext_table[i].i_codec != 0; i++ )
 579     {
 580         if( ext_table[i].i_codec == i_codec ) return ext_table[i].psz_ext;
 581     }
 582
 583     return NULL;
 584 }
 585 */
 586
 587 static const struct
 588 {
 589     vlc_fourcc_t i_codec;
 590     const char *psz_mime;
 591 } mime_table[] =
 592 {
 593     { VLC_CODEC_BMP,               "image/bmp" },
 594     { VLC_CODEC_BMP,               "image/x-bmp" },
 595     { VLC_CODEC_BMP,               "image/x-bitmap" },
 596     { VLC_CODEC_BMP,               "image/x-ms-bmp" },
 597     { VLC_CODEC_PNM,               "image/x-portable-anymap" },
 598     { VLC_CODEC_PNM,               "image/x-portable-bitmap" },
 599     { VLC_CODEC_PNM,               "image/x-portable-graymap" },
 600     { VLC_CODEC_PNM,               "image/x-portable-pixmap" },
 601     { VLC_CODEC_GIF,               "image/gif" },
 602     { VLC_CODEC_JPEG,              "image/jpeg" },
 603     { VLC_CODEC_PCX,               "image/pcx" },
 604     { VLC_CODEC_PNG,               "image/png" },
 605     { VLC_CODEC_TIFF,              "image/tiff" },
 606     { VLC_CODEC_TARGA,             "iamge/x-tga" },
 607     { VLC_FOURCC('x','p','m',' '), "image/x-xpixmap" },
 608     { 0, NULL }
 609 };
 610
 611 vlc_fourcc_t image_Mime2Fourcc( const char *psz_mime )
 612 {
 613     int i;
 614     for( i = 0; mime_table[i].i_codec; i++ )
 615         if( !strcmp( psz_mime, mime_table[i].psz_mime ) )
 616             return mime_table[i].i_codec;
 617     return 0;
 618 }
 619
 620
 621 static picture_t *video_new_buffer( decoder_t *p_dec )
 622 {
 623     p_dec->fmt_out.video.i_chroma = p_dec->fmt_out.i_codec;
 624     return picture_NewFromFormat( &p_dec->fmt_out.video );
 625 }
 626
 627 static void video_del_buffer( decoder_t *p_dec, picture_t *p_pic )
 628 {
 629     if( p_pic->i_refcount != 1 )
 630         msg_Err( p_dec, "invalid picture reference count" );
 631
 632     p_pic->i_refcount = 0;
 633     picture_Delete( p_pic );
 634 }
 635
 636 static void video_link_picture( decoder_t *p_dec, picture_t *p_pic )
 637 {
 638     (void)p_dec;
 639     picture_Hold( p_pic );
 640 }
 641
 642 static void video_unlink_picture( decoder_t *p_dec, picture_t *p_pic )
 643 {
 644     (void)p_dec;
 645     picture_Release( p_pic );
 646 }
 647
 648 static decoder_t *CreateDecoder( vlc_object_t *p_this, video_format_t *fmt )
 649 {
 650     decoder_t *p_dec;
 651
 652     p_dec = vlc_object_create( p_this, VLC_OBJECT_DECODER );
 653     if( p_dec == NULL )
 654         return NULL;
 655
 656     p_dec->p_module = NULL;
 657     es_format_Init( &p_dec->fmt_in, VIDEO_ES, fmt->i_chroma );
 658     es_format_Init( &p_dec->fmt_out, VIDEO_ES, 0 );
 659     p_dec->fmt_in.video = *fmt;
 660     p_dec->b_pace_control = true;
 661
 662     p_dec->pf_vout_buffer_new = video_new_buffer;
 663     p_dec->pf_vout_buffer_del = video_del_buffer;
 664     p_dec->pf_picture_link    = video_link_picture;
 665     p_dec->pf_picture_unlink  = video_unlink_picture;
 666
 667     vlc_object_attach( p_dec, p_this );
 668
 669     /* Find a suitable decoder module */
 670     p_dec->p_module = module_need( p_dec, "decoder", "$codec", false );
 671     if( !p_dec->p_module )
 672     {
 673         msg_Err( p_dec, "no suitable decoder module for fourcc `%4.4s'. "
 674                  "VLC probably does not support this image format.",
 675                  (char*)&p_dec->fmt_in.i_codec );
 676
 677         DeleteDecoder( p_dec );
 678         return NULL;
 679     }
 680
 681     return p_dec;
 682 }
 683
 684 static void DeleteDecoder( decoder_t * p_dec )
 685 {
 686     vlc_object_detach( p_dec );
 687
 688     if( p_dec->p_module ) module_unneed( p_dec, p_dec->p_module );
 689
 690     es_format_Clean( &p_dec->fmt_in );
 691     es_format_Clean( &p_dec->fmt_out );
 692
 693     if( p_dec->p_description )
 694         vlc_meta_Delete( p_dec->p_description );
 695
 696     vlc_object_release( p_dec );
 697     p_dec = NULL;
 698 }
 699
 700 static encoder_t *CreateEncoder( vlc_object_t *p_this, video_format_t *fmt_in,
 701                                  video_format_t *fmt_out )
 702 {
 703     encoder_t *p_enc;
 704
 705     p_enc = sout_EncoderCreate( p_this );
 706     if( p_enc == NULL )
 707         return NULL;
 708
 709     p_enc->p_module = NULL;
 710     es_format_Init( &p_enc->fmt_in, VIDEO_ES, fmt_in->i_chroma );
 711     p_enc->fmt_in.video = *fmt_in;
 712     if( fmt_out->i_width > 0 && fmt_out->i_height > 0 )
 713     {
 714         p_enc->fmt_in.video.i_width = fmt_out->i_width;
 715         p_enc->fmt_in.video.i_height = fmt_out->i_height;
 716
 717         if( fmt_out->i_visible_width > 0 &&
 718             fmt_out->i_visible_height > 0 )
 719         {
 720             p_enc->fmt_in.video.i_visible_width = fmt_out->i_visible_width;
 721             p_enc->fmt_in.video.i_visible_height = fmt_out->i_visible_height;
 722         }
 723         else
 724         {
 725             p_enc->fmt_in.video.i_visible_width = fmt_out->i_width;
 726             p_enc->fmt_in.video.i_visible_height = fmt_out->i_height;
 727         }
 728     }
 729     else if( fmt_out->i_sar_num && fmt_out->i_sar_den &&
 730              fmt_out->i_sar_num * fmt_in->i_sar_den !=
 731              fmt_out->i_sar_den * fmt_in->i_sar_num )
 732     {
 733         p_enc->fmt_in.video.i_width =
 734             fmt_in->i_sar_num * (int64_t)fmt_out->i_sar_den * fmt_in->i_width /
 735             fmt_in->i_sar_den / fmt_out->i_sar_num;
 736         p_enc->fmt_in.video.i_visible_width =
 737             fmt_in->i_sar_num * (int64_t)fmt_out->i_sar_den *
 738             fmt_in->i_visible_width / fmt_in->i_sar_den / fmt_out->i_sar_num;
 739     }
 740
 741     p_enc->fmt_in.video.i_frame_rate = 25;
 742     p_enc->fmt_in.video.i_frame_rate_base = 1;
 743
 744     es_format_Init( &p_enc->fmt_out, VIDEO_ES, fmt_out->i_chroma );
 745     p_enc->fmt_out.video = *fmt_out;
 746     p_enc->fmt_out.video.i_width = p_enc->fmt_in.video.i_width;
 747     p_enc->fmt_out.video.i_height = p_enc->fmt_in.video.i_height;
 748
 749     vlc_object_attach( p_enc, p_this );
 750
 751     /* Find a suitable decoder module */
 752     p_enc->p_module = module_need( p_enc, "encoder", NULL, false );
 753     if( !p_enc->p_module )
 754     {
 755         msg_Err( p_enc, "no suitable encoder module for fourcc `%4.4s'.\n"
 756                  "VLC probably does not support this image format.",
 757                  (char*)&p_enc->fmt_out.i_codec );
 758
 759         DeleteEncoder( p_enc );
 760         return NULL;
 761     }
 762     p_enc->fmt_in.video.i_chroma = p_enc->fmt_in.i_codec;
 763
 764     return p_enc;
 765 }
 766
 767 static void DeleteEncoder( encoder_t * p_enc )
 768 {
 769     vlc_object_detach( p_enc );
 770
 771     if( p_enc->p_module ) module_unneed( p_enc, p_enc->p_module );
 772
 773     es_format_Clean( &p_enc->fmt_in );
 774     es_format_Clean( &p_enc->fmt_out );
 775
 776     vlc_object_release( p_enc );
 777     p_enc = NULL;
 778 }
 779
 780 static filter_t *CreateFilter( vlc_object_t *p_this, es_format_t *p_fmt_in,
 781                                video_format_t *p_fmt_out,
 782                                const char *psz_module )
 783 {
 784     static const char typename[] = "filter";
 785     filter_t *p_filter;
 786
 787     p_filter = vlc_custom_create( p_this, sizeof(filter_t),
 788                                   VLC_OBJECT_GENERIC, typename );
 789     vlc_object_attach( p_filter, p_this );
 790
 791     p_filter->pf_vout_buffer_new =
 792         (picture_t *(*)(filter_t *))video_new_buffer;
 793     p_filter->pf_vout_buffer_del =
 794         (void (*)(filter_t *, picture_t *))video_del_buffer;
 795
 796     p_filter->fmt_in = *p_fmt_in;
 797     p_filter->fmt_out = *p_fmt_in;
 798     p_filter->fmt_out.i_codec = p_fmt_out->i_chroma;
 799     p_filter->fmt_out.video = *p_fmt_out;
 800     p_filter->p_module = module_need( p_filter, "video filter2",
 801                                       psz_module, false );
 802
 803     if( !p_filter->p_module )
 804     {
 805         msg_Dbg( p_filter, "no video filter found" );
 806         DeleteFilter( p_filter );
 807         return NULL;
 808     }
 809
 810     return p_filter;
 811 }
 812
 813 static void DeleteFilter( filter_t * p_filter )
 814 {
 815     vlc_object_detach( p_filter );
 816
 817     if( p_filter->p_module ) module_unneed( p_filter, p_filter->p_module );
 818
 819     es_format_Clean( &p_filter->fmt_in );
 820     es_format_Clean( &p_filter->fmt_out );
 821
 822     vlc_object_release( p_filter );
 823 }