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