git.sesse.net Git - vlc/blob - modules/video_chroma/i422_yuy2.c

   1 /*****************************************************************************
   2  * i422_yuy2.c : YUV to YUV conversion module for vlc
   3  *****************************************************************************
   4  * Copyright (C) 2000, 2001 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Samuel Hocevar <sam@zoy.org>
   8  *          Damien Fouilleul <damienf@videolan.org>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  23  *****************************************************************************/
  24
  25 /*****************************************************************************
  26  * Preamble
  27  *****************************************************************************/
  28 #include <string.h>                                            /* strerror() */
  29
  30 #include <vlc/vlc.h>
  31 #include <vlc_vout.h>
  32
  33 #include "i422_yuy2.h"
  34
  35 #define SRC_FOURCC  "I422"
  36 #if defined (MODULE_NAME_IS_i422_yuy2)
  37 #    define DEST_FOURCC "YUY2,YUNV,YVYU,UYVY,UYNV,Y422,IUYV,cyuv,Y211"
  38 #else
  39 #    define DEST_FOURCC "YUY2,YUNV,YVYU,UYVY,UYNV,Y422,IUYV,cyuv"
  40 #endif
  41
  42 /*****************************************************************************
  43  * Local and extern prototypes.
  44  *****************************************************************************/
  45 static int  Activate ( vlc_object_t * );
  46
  47 static void I422_YUY2           ( vout_thread_t *, picture_t *, picture_t * );
  48 static void I422_YVYU           ( vout_thread_t *, picture_t *, picture_t * );
  49 static void I422_UYVY           ( vout_thread_t *, picture_t *, picture_t * );
  50 static void I422_IUYV           ( vout_thread_t *, picture_t *, picture_t * );
  51 static void I422_cyuv           ( vout_thread_t *, picture_t *, picture_t * );
  52 #if defined (MODULE_NAME_IS_i422_yuy2)
  53 static void I422_Y211           ( vout_thread_t *, picture_t *, picture_t * );
  54 static void I422_Y211           ( vout_thread_t *, picture_t *, picture_t * );
  55 static void I422_YV12           ( vout_thread_t *, picture_t *, picture_t * );
  56 #endif
  57
  58 /*****************************************************************************
  59  * Module descriptor
  60  *****************************************************************************/
  61 vlc_module_begin();
  62 #if defined (MODULE_NAME_IS_i422_yuy2)
  63     set_description( _("Conversions from " SRC_FOURCC " to " DEST_FOURCC) );
  64     set_capability( "chroma", 80 );
  65 #elif defined (MODULE_NAME_IS_i422_yuy2_mmx)
  66     set_description( _("MMX conversions from " SRC_FOURCC " to " DEST_FOURCC) );
  67     set_capability( "chroma", 100 );
  68     add_requirement( MMX );
  69 #elif defined (MODULE_NAME_IS_i422_yuy2_sse2)
  70     set_description( _("SSE2 conversions from " SRC_FOURCC " to " DEST_FOURCC) );
  71     set_capability( "chroma", 120 );
  72     add_requirement( MMX );
  73 #endif
  74     set_callbacks( Activate, NULL );
  75 vlc_module_end();
  76
  77 /*****************************************************************************
  78  * Activate: allocate a chroma function
  79  *****************************************************************************
  80  * This function allocates and initializes a chroma function
  81  *****************************************************************************/
  82 static int Activate( vlc_object_t *p_this )
  83 {
  84     vout_thread_t *p_vout = (vout_thread_t *)p_this;
  85
  86     if( p_vout->render.i_width & 1 || p_vout->render.i_height & 1 )
  87     {
  88         return -1;
  89     }
  90
  91     switch( p_vout->render.i_chroma )
  92     {
  93         case VLC_FOURCC('I','4','2','2'):
  94             switch( p_vout->output.i_chroma )
  95             {
  96                 case VLC_FOURCC('Y','U','Y','2'):
  97                 case VLC_FOURCC('Y','U','N','V'):
  98                     p_vout->chroma.pf_convert = I422_YUY2;
  99                     break;
 100
 101                 case VLC_FOURCC('Y','V','Y','U'):
 102                     p_vout->chroma.pf_convert = I422_YVYU;
 103                     break;
 104
 105                 case VLC_FOURCC('U','Y','V','Y'):
 106                 case VLC_FOURCC('U','Y','N','V'):
 107                 case VLC_FOURCC('Y','4','2','2'):
 108                     p_vout->chroma.pf_convert = I422_UYVY;
 109                     break;
 110
 111                 case VLC_FOURCC('I','U','Y','V'):
 112                     p_vout->chroma.pf_convert = I422_IUYV;
 113                     break;
 114
 115                 case VLC_FOURCC('c','y','u','v'):
 116                     p_vout->chroma.pf_convert = I422_cyuv;
 117                     break;
 118
 119 #if defined (MODULE_NAME_IS_i422_yuy2)
 120                 case VLC_FOURCC('Y','2','1','1'):
 121                     p_vout->chroma.pf_convert = I422_Y211;
 122                     break;
 123
 124                 case VLC_FOURCC('Y','V','1','2'):
 125                     p_vout->chroma.pf_convert = I422_YV12;
 126                     break;
 127 #endif
 128
 129                 default:
 130                     return -1;
 131             }
 132             break;
 133
 134         default:
 135             return -1;
 136     }
 137     return 0;
 138 }
 139
 140 /* Following functions are local */
 141
 142 /*****************************************************************************
 143  * I422_YUY2: planar YUV 4:2:2 to packed YUY2 4:2:2
 144  *****************************************************************************/
 145 static void I422_YUY2( vout_thread_t *p_vout, picture_t *p_source,
 146                                               picture_t *p_dest )
 147 {
 148     uint8_t *p_line = p_dest->p->p_pixels;
 149     uint8_t *p_y = p_source->Y_PIXELS;
 150     uint8_t *p_u = p_source->U_PIXELS;
 151     uint8_t *p_v = p_source->V_PIXELS;
 152
 153     int i_x, i_y;
 154
 155     const int i_source_margin = p_source->p[0].i_pitch
 156                                  - p_source->p[0].i_visible_pitch;
 157     const int i_source_margin_c = p_source->p[1].i_pitch
 158                                  - p_source->p[1].i_visible_pitch;
 159     const int i_dest_margin = p_dest->p->i_pitch
 160                                - p_dest->p->i_visible_pitch;
 161
 162 #if defined (MODULE_NAME_IS_i422_yuy2_sse2)
 163
 164     if( 0 == (15 & (p_source->p[Y_PLANE].i_pitch|p_dest->p->i_pitch|
 165         ((int)p_line|(int)p_y))) )
 166     {
 167         /* use faster SSE2 aligned fetch and store */
 168         for( i_y = p_vout->render.i_height ; i_y-- ; )
 169         {
 170             for( i_x = p_vout->render.i_width / 16 ; i_x-- ; )
 171             {
 172                 SSE2_CALL( SSE2_YUV422_YUYV_ALIGNED );
 173             }
 174             for( i_x = ( p_vout->render.i_width % 16 ) / 2; i_x-- ; )
 175             {
 176                 C_YUV422_YUYV( p_line, p_y, p_u, p_v );
 177             }
 178             p_y += i_source_margin;
 179             p_u += i_source_margin_c;
 180             p_v += i_source_margin_c;
 181             p_line += i_dest_margin;
 182         }
 183     }
 184     else {
 185         /* use slower SSE2 unaligned fetch and store */
 186         for( i_y = p_vout->render.i_height ; i_y-- ; )
 187         {
 188             for( i_x = p_vout->render.i_width / 16 ; i_x-- ; )
 189             {
 190                 SSE2_CALL( SSE2_YUV422_YUYV_UNALIGNED );
 191             }
 192             for( i_x = ( p_vout->render.i_width % 16 ) / 2; i_x-- ; )
 193             {
 194                 C_YUV422_YUYV( p_line, p_y, p_u, p_v );
 195             }
 196             p_y += i_source_margin;
 197             p_u += i_source_margin_c;
 198             p_v += i_source_margin_c;
 199             p_line += i_dest_margin;
 200         }
 201     }
 202     SSE2_END;
 203
 204 #else
 205
 206     for( i_y = p_vout->render.i_height ; i_y-- ; )
 207     {
 208         for( i_x = p_vout->render.i_width / 8 ; i_x-- ; )
 209         {
 210 #if defined (MODULE_NAME_IS_i422_yuy2)
 211             C_YUV422_YUYV( p_line, p_y, p_u, p_v );
 212             C_YUV422_YUYV( p_line, p_y, p_u, p_v );
 213             C_YUV422_YUYV( p_line, p_y, p_u, p_v );
 214             C_YUV422_YUYV( p_line, p_y, p_u, p_v );
 215 #elif defined (MODULE_NAME_IS_i422_yuy2_mmx)
 216             MMX_CALL( MMX_YUV422_YUYV );
 217 #endif
 218         }
 219         for( i_x = ( p_vout->render.i_width % 8 ) / 2; i_x-- ; )
 220         {
 221             C_YUV422_YUYV( p_line, p_y, p_u, p_v );
 222         }
 223         p_y += i_source_margin;
 224         p_u += i_source_margin_c;
 225         p_v += i_source_margin_c;
 226         p_line += i_dest_margin;
 227     }
 228 #if defined (MODULE_NAME_IS_i422_yuy2_mmx)
 229     MMX_END;
 230 #endif
 231
 232 #endif
 233 }
 234
 235 /*****************************************************************************
 236  * I422_YVYU: planar YUV 4:2:2 to packed YVYU 4:2:2
 237  *****************************************************************************/
 238 static void I422_YVYU( vout_thread_t *p_vout, picture_t *p_source,
 239                                               picture_t *p_dest )
 240 {
 241     uint8_t *p_line = p_dest->p->p_pixels;
 242     uint8_t *p_y = p_source->Y_PIXELS;
 243     uint8_t *p_u = p_source->U_PIXELS;
 244     uint8_t *p_v = p_source->V_PIXELS;
 245
 246     int i_x, i_y;
 247
 248     const int i_source_margin = p_source->p[0].i_pitch
 249                                  - p_source->p[0].i_visible_pitch;
 250     const int i_source_margin_c = p_source->p[1].i_pitch
 251                                  - p_source->p[1].i_visible_pitch;
 252     const int i_dest_margin = p_dest->p->i_pitch
 253                                - p_dest->p->i_visible_pitch;
 254
 255 #if defined (MODULE_NAME_IS_i422_yuy2_sse2)
 256
 257     if( 0 == (15 & (p_source->p[Y_PLANE].i_pitch|p_dest->p->i_pitch|
 258         ((int)p_line|(int)p_y))) )
 259     {
 260         /* use faster SSE2 aligned fetch and store */
 261         for( i_y = p_vout->render.i_height ; i_y-- ; )
 262         {
 263             for( i_x = p_vout->render.i_width / 16 ; i_x-- ; )
 264             {
 265                 SSE2_CALL( SSE2_YUV422_YVYU_ALIGNED );
 266             }
 267             for( i_x = ( p_vout->render.i_width % 16 ) / 2; i_x-- ; )
 268             {
 269                 C_YUV422_YVYU( p_line, p_y, p_u, p_v );
 270             }
 271             p_y += i_source_margin;
 272             p_u += i_source_margin_c;
 273             p_v += i_source_margin_c;
 274             p_line += i_dest_margin;
 275         }
 276     }
 277     else {
 278         /* use slower SSE2 unaligned fetch and store */
 279         for( i_y = p_vout->render.i_height ; i_y-- ; )
 280         {
 281             for( i_x = p_vout->render.i_width / 16 ; i_x-- ; )
 282             {
 283                 SSE2_CALL( SSE2_YUV422_YVYU_UNALIGNED );
 284             }
 285             for( i_x = ( p_vout->render.i_width % 16 ) / 2; i_x-- ; )
 286             {
 287                 C_YUV422_YVYU( p_line, p_y, p_u, p_v );
 288             }
 289             p_y += i_source_margin;
 290             p_u += i_source_margin_c;
 291             p_v += i_source_margin_c;
 292             p_line += i_dest_margin;
 293         }
 294     }
 295     SSE2_END;
 296
 297 #else
 298
 299     for( i_y = p_vout->render.i_height ; i_y-- ; )
 300     {
 301         for( i_x = p_vout->render.i_width / 8 ; i_x-- ; )
 302         {
 303 #if defined (MODULE_NAME_IS_i422_yuy2)
 304             C_YUV422_YVYU( p_line, p_y, p_u, p_v );
 305             C_YUV422_YVYU( p_line, p_y, p_u, p_v );
 306             C_YUV422_YVYU( p_line, p_y, p_u, p_v );
 307             C_YUV422_YVYU( p_line, p_y, p_u, p_v );
 308 #elif defined (MODULE_NAME_IS_i422_yuy2_mmx)
 309             MMX_CALL( MMX_YUV422_YVYU );
 310 #endif
 311         }
 312         for( i_x = ( p_vout->render.i_width % 8 ) / 2; i_x-- ; )
 313         {
 314             C_YUV422_YVYU( p_line, p_y, p_u, p_v );
 315         }
 316         p_y += i_source_margin;
 317         p_u += i_source_margin_c;
 318         p_v += i_source_margin_c;
 319         p_line += i_dest_margin;
 320     }
 321 #if defined (MODULE_NAME_IS_i422_yuy2_mmx)
 322     MMX_END;
 323 #endif
 324
 325 #endif
 326 }
 327
 328 /*****************************************************************************
 329  * I422_UYVY: planar YUV 4:2:2 to packed UYVY 4:2:2
 330  *****************************************************************************/
 331 static void I422_UYVY( vout_thread_t *p_vout, picture_t *p_source,
 332                                               picture_t *p_dest )
 333 {
 334     uint8_t *p_line = p_dest->p->p_pixels;
 335     uint8_t *p_y = p_source->Y_PIXELS;
 336     uint8_t *p_u = p_source->U_PIXELS;
 337     uint8_t *p_v = p_source->V_PIXELS;
 338
 339     int i_x, i_y;
 340
 341     const int i_source_margin = p_source->p[0].i_pitch
 342                                  - p_source->p[0].i_visible_pitch;
 343     const int i_source_margin_c = p_source->p[1].i_pitch
 344                                  - p_source->p[1].i_visible_pitch;
 345     const int i_dest_margin = p_dest->p->i_pitch
 346                                - p_dest->p->i_visible_pitch;
 347
 348 #if defined (MODULE_NAME_IS_i422_yuy2_sse2)
 349
 350     if( 0 == (15 & (p_source->p[Y_PLANE].i_pitch|p_dest->p->i_pitch|
 351         ((int)p_line|(int)p_y))) )
 352     {
 353         /* use faster SSE2 aligned fetch and store */
 354         for( i_y = p_vout->render.i_height ; i_y-- ; )
 355         {
 356             for( i_x = p_vout->render.i_width / 16 ; i_x-- ; )
 357             {
 358                 SSE2_CALL( SSE2_YUV422_UYVY_ALIGNED );
 359             }
 360             for( i_x = ( p_vout->render.i_width % 16 ) / 2; i_x-- ; )
 361             {
 362                 C_YUV422_UYVY( p_line, p_y, p_u, p_v );
 363             }
 364             p_y += i_source_margin;
 365             p_u += i_source_margin_c;
 366             p_v += i_source_margin_c;
 367             p_line += i_dest_margin;
 368         }
 369     }
 370     else {
 371         /* use slower SSE2 unaligned fetch and store */
 372         for( i_y = p_vout->render.i_height ; i_y-- ; )
 373         {
 374             for( i_x = p_vout->render.i_width / 16 ; i_x-- ; )
 375             {
 376                 SSE2_CALL( SSE2_YUV422_UYVY_UNALIGNED );
 377             }
 378             for( i_x = ( p_vout->render.i_width % 16 ) / 2; i_x-- ; )
 379             {
 380                 C_YUV422_UYVY( p_line, p_y, p_u, p_v );
 381             }
 382             p_y += i_source_margin;
 383             p_u += i_source_margin_c;
 384             p_v += i_source_margin_c;
 385             p_line += i_dest_margin;
 386         }
 387     }
 388     SSE2_END;
 389
 390 #else
 391
 392     for( i_y = p_vout->render.i_height ; i_y-- ; )
 393     {
 394         for( i_x = p_vout->render.i_width / 8 ; i_x-- ; )
 395         {
 396 #if defined (MODULE_NAME_IS_i422_yuy2)
 397             C_YUV422_UYVY( p_line, p_y, p_u, p_v );
 398             C_YUV422_UYVY( p_line, p_y, p_u, p_v );
 399             C_YUV422_UYVY( p_line, p_y, p_u, p_v );
 400             C_YUV422_UYVY( p_line, p_y, p_u, p_v );
 401 #elif defined (MODULE_NAME_IS_i422_yuy2_mmx)
 402             MMX_CALL( MMX_YUV422_UYVY );
 403 #endif
 404         }
 405         for( i_x = ( p_vout->render.i_width % 8 ) / 2; i_x-- ; )
 406         {
 407             C_YUV422_UYVY( p_line, p_y, p_u, p_v );
 408         }
 409         p_y += i_source_margin;
 410         p_u += i_source_margin_c;
 411         p_v += i_source_margin_c;
 412         p_line += i_dest_margin;
 413     }
 414 #if defined (MODULE_NAME_IS_i422_yuy2_mmx)
 415     MMX_END;
 416 #endif
 417
 418 #endif
 419 }
 420
 421 /*****************************************************************************
 422  * I422_IUYV: planar YUV 4:2:2 to interleaved packed IUYV 4:2:2
 423  *****************************************************************************/
 424 static void I422_IUYV( vout_thread_t *p_vout, picture_t *p_source,
 425                                               picture_t *p_dest )
 426 {
 427     /* FIXME: TODO ! */
 428     msg_Err( p_vout, "I422_IUYV unimplemented, please harass <sam@zoy.org>" );
 429 }
 430
 431 /*****************************************************************************
 432  * I422_cyuv: planar YUV 4:2:2 to upside-down packed UYVY 4:2:2
 433  *****************************************************************************/
 434 static void I422_cyuv( vout_thread_t *p_vout, picture_t *p_source,
 435                                               picture_t *p_dest )
 436 {
 437     uint8_t *p_line = p_dest->p->p_pixels + p_dest->p->i_visible_lines * p_dest->p->i_pitch;
 438     uint8_t *p_y = p_source->Y_PIXELS;
 439     uint8_t *p_u = p_source->U_PIXELS;
 440     uint8_t *p_v = p_source->V_PIXELS;
 441
 442     int i_x, i_y;
 443
 444     const int i_source_margin = p_source->p[0].i_pitch
 445                                  - p_source->p[0].i_visible_pitch;
 446     const int i_source_margin_c = p_source->p[1].i_pitch
 447                                  - p_source->p[1].i_visible_pitch;
 448     const int i_dest_margin = p_dest->p->i_pitch
 449                                - p_dest->p->i_visible_pitch;
 450
 451 #if defined (MODULE_NAME_IS_i422_yuy2_sse2)
 452
 453     if( 0 == (15 & (p_source->p[Y_PLANE].i_pitch|p_dest->p->i_pitch|
 454         ((int)p_line|(int)p_y))) )
 455     {
 456         /* use faster SSE2 aligned fetch and store */
 457         for( i_y = p_vout->render.i_height ; i_y-- ; )
 458         {
 459             p_line -= 2 * p_dest->p->i_pitch;
 460
 461             for( i_x = p_vout->render.i_width / 16 ; i_x-- ; )
 462             {
 463                 SSE2_CALL( SSE2_YUV422_UYVY_ALIGNED );
 464             }
 465             for( i_x = ( p_vout->render.i_width % 16 ) / 2; i_x-- ; )
 466             {
 467                 C_YUV422_UYVY( p_line, p_y, p_u, p_v );
 468             }
 469             p_y += i_source_margin;
 470             p_u += i_source_margin_c;
 471             p_v += i_source_margin_c;
 472             p_line += i_dest_margin;
 473         }
 474     }
 475     else {
 476         /* use slower SSE2 unaligned fetch and store */
 477         for( i_y = p_vout->render.i_height ; i_y-- ; )
 478         {
 479             p_line -= 2 * p_dest->p->i_pitch;
 480
 481             for( i_x = p_vout->render.i_width / 16 ; i_x-- ; )
 482             {
 483                 SSE2_CALL( SSE2_YUV422_UYVY_UNALIGNED );
 484             }
 485             for( i_x = ( p_vout->render.i_width % 16 ) / 2; i_x-- ; )
 486             {
 487                 C_YUV422_UYVY( p_line, p_y, p_u, p_v );
 488             }
 489             p_y += i_source_margin;
 490             p_u += i_source_margin_c;
 491             p_v += i_source_margin_c;
 492             p_line += i_dest_margin;
 493         }
 494     }
 495     SSE2_END;
 496
 497 #else
 498
 499     for( i_y = p_vout->render.i_height ; i_y-- ; )
 500     {
 501         for( i_x = p_vout->render.i_width / 8 ; i_x-- ; )
 502         {
 503             p_line -= 2 * p_dest->p->i_pitch;
 504
 505 #if defined (MODULE_NAME_IS_i422_yuy2)
 506             C_YUV422_UYVY( p_line, p_y, p_u, p_v );
 507             C_YUV422_UYVY( p_line, p_y, p_u, p_v );
 508             C_YUV422_UYVY( p_line, p_y, p_u, p_v );
 509             C_YUV422_UYVY( p_line, p_y, p_u, p_v );
 510 #elif defined (MODULE_NAME_IS_i422_yuy2_mmx)
 511             MMX_CALL( MMX_YUV422_UYVY );
 512 #endif
 513         }
 514         p_y += i_source_margin;
 515         p_u += i_source_margin_c;
 516         p_v += i_source_margin_c;
 517         p_line += i_dest_margin;
 518     }
 519 #if defined (MODULE_NAME_IS_i422_yuy2_mmx)
 520     MMX_END;
 521 #elif defined (MODULE_NAME_IS_i422_yuy2_sse2)
 522     SSE2_END;
 523 #endif
 524
 525 #endif
 526 }
 527
 528 /*****************************************************************************
 529  * I422_Y211: planar YUV 4:2:2 to packed YUYV 2:1:1
 530  *****************************************************************************/
 531 #if defined (MODULE_NAME_IS_i422_yuy2)
 532 static void I422_Y211( vout_thread_t *p_vout, picture_t *p_source,
 533                                               picture_t *p_dest )
 534 {
 535     uint8_t *p_line = p_dest->p->p_pixels + p_dest->p->i_visible_lines * p_dest->p->i_pitch;
 536     uint8_t *p_y = p_source->Y_PIXELS;
 537     uint8_t *p_u = p_source->U_PIXELS;
 538     uint8_t *p_v = p_source->V_PIXELS;
 539
 540     int i_x, i_y;
 541
 542     for( i_y = p_vout->render.i_height ; i_y-- ; )
 543     {
 544         for( i_x = p_vout->render.i_width / 8 ; i_x-- ; )
 545         {
 546             C_YUV422_Y211( p_line, p_y, p_u, p_v );
 547             C_YUV422_Y211( p_line, p_y, p_u, p_v );
 548         }
 549     }
 550 }
 551 #endif
 552
 553
 554 /*****************************************************************************
 555  * I422_YV12: planar YUV 4:2:2 to planar YV12
 556  *****************************************************************************/
 557 #if defined (MODULE_NAME_IS_i422_yuy2)
 558 static void I422_YV12( vout_thread_t *p_vout, picture_t *p_source,
 559                                               picture_t *p_dest )
 560 {
 561     uint16_t i_dpy = p_dest->p[Y_PLANE].i_pitch;
 562     uint16_t i_spy = p_source->p[Y_PLANE].i_pitch;
 563     uint16_t i_dpuv = p_dest->p[U_PLANE].i_pitch;
 564     uint16_t i_spuv = p_source->p[U_PLANE].i_pitch;
 565     uint16_t i_width = p_vout->render.i_width;
 566     uint16_t i_y = p_vout->render.i_height;
 567     uint8_t *p_dy = p_dest->Y_PIXELS + (i_y-1)*i_dpy;
 568     uint8_t *p_y = p_source->Y_PIXELS + (i_y-1)*i_spy;
 569     uint8_t *p_du = p_dest->U_PIXELS + (i_y/2-1)*i_dpuv;
 570     uint8_t *p_u = p_source->U_PIXELS + (i_y-1)*i_spuv;
 571     uint8_t *p_dv = p_dest->V_PIXELS + (i_y/2-1)*i_dpuv;
 572     uint8_t *p_v = p_source->V_PIXELS + (i_y-1)*i_spuv;
 573     i_y /= 2;
 574
 575     for ( ; i_y--; )
 576     {
 577         memcpy(p_dy, p_y, i_width); p_dy -= i_dpy; p_y -= i_spy;
 578         memcpy(p_dy, p_y, i_width); p_dy -= i_dpy; p_y -= i_spy;
 579         memcpy(p_du, p_u, i_width/2); p_du -= i_dpuv; p_u -= 2*i_spuv;
 580         memcpy(p_dv, p_v, i_width/2); p_dv -= i_dpuv; p_v -= 2*i_spuv;
 581     }
 582
 583 }
 584 #endif