git.sesse.net Git - vlc/blob - plugins/yuv/video_yuv.c

   1 /*****************************************************************************
   2  * video_yuv.c: YUV transformation functions
   3  * Provides functions to perform the YUV conversion. The functions provided here
   4  * are a complete and portable C implementation, and may be replaced in certain
   5  * case by optimized functions.
   6  *****************************************************************************
   7  * Copyright (C) 1999-2001 VideoLAN
   8  * $Id: video_yuv.c,v 1.16 2001/11/28 15:08:06 massiot Exp $
   9  *
  10  * Authors: Vincent Seguin <seguin@via.ecp.fr>
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  20  * General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public
  23  * License along with this program; if not, write to the
  24  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  25  * Boston, MA 02111-1307, USA.
  26  *****************************************************************************/
  27
  28 #define MODULE_NAME yuv
  29 #include "modules_inner.h"
  30
  31 /*****************************************************************************
  32  * Preamble
  33  *****************************************************************************/
  34 #include "defs.h"
  35
  36 #include <math.h>                                            /* exp(), pow() */
  37 #include <errno.h>                                                 /* ENOMEM */
  38 #include <stdlib.h>                                                /* free() */
  39 #include <string.h>                                            /* strerror() */
  40
  41 #include "config.h"
  42 #include "common.h"
  43 #include "intf_msg.h"
  44 #include "threads.h"
  45 #include "mtime.h"
  46 #include "tests.h"
  47
  48 #include "video.h"
  49 #include "video_output.h"
  50
  51 #include "video_common.h"
  52
  53 #include "modules.h"
  54 #include "modules_export.h"
  55
  56 static int     yuv_Probe      ( probedata_t *p_data );
  57 static int     yuv_Init       ( vout_thread_t *p_vout );
  58 static int     yuv_Reset      ( vout_thread_t *p_vout );
  59 static void    yuv_End        ( vout_thread_t *p_vout );
  60
  61 static void    SetGammaTable  ( int *pi_table, double f_gamma );
  62 static void    SetYUV         ( vout_thread_t *p_vout );
  63
  64 /*****************************************************************************
  65  * Functions exported as capabilities. They are declared as static so that
  66  * we don't pollute the namespace too much.
  67  *****************************************************************************/
  68 void _M( yuv_getfunctions )( function_list_t * p_function_list )
  69 {
  70     p_function_list->pf_probe = yuv_Probe;
  71     p_function_list->functions.yuv.pf_init = yuv_Init;
  72     p_function_list->functions.yuv.pf_reset = yuv_Reset;
  73     p_function_list->functions.yuv.pf_end = yuv_End;
  74 }
  75
  76 /*****************************************************************************
  77  * yuv_Probe: tests probe the audio device and return a score
  78  *****************************************************************************
  79  * This function tries to open the DSP and returns a score to the plugin
  80  * manager so that it can choose the most appropriate one.
  81  *****************************************************************************/
  82 static int yuv_Probe( probedata_t *p_data )
  83 {
  84     if( TestMethod( YUV_METHOD_VAR, "yuv" )
  85          || TestMethod( YUV_METHOD_VAR, "c" ) )
  86     {
  87         return( 999 );
  88     }
  89
  90     /* This module always works */
  91     return( 50 );
  92 }
  93
  94 /*****************************************************************************
  95  * yuv_Init: allocate and initialize translations tables
  96  *****************************************************************************
  97  * This function will allocate memory to store translation tables, depending
  98  * of the screen depth.
  99  *****************************************************************************/
 100 static int yuv_Init( vout_thread_t *p_vout )
 101 {
 102     size_t      tables_size;                        /* tables size, in bytes */
 103
 104     /* Computes tables size - 3 Bpp use 32 bits pixel entries in tables */
 105     switch( p_vout->i_bytes_per_pixel )
 106     {
 107     case 1:
 108         tables_size = sizeof( u8 )
 109                 * (p_vout->b_grayscale ? GRAY_TABLE_SIZE : PALETTE_TABLE_SIZE);
 110         break;
 111     case 2:
 112         tables_size = sizeof( u16 )
 113                 * (p_vout->b_grayscale ? GRAY_TABLE_SIZE : RGB_TABLE_SIZE);
 114         break;
 115     case 3:
 116     case 4:
 117     default:
 118         tables_size = sizeof( u32 )
 119                 * (p_vout->b_grayscale ? GRAY_TABLE_SIZE : RGB_TABLE_SIZE);
 120         break;
 121     }
 122
 123     /* Allocate memory */
 124     p_vout->yuv.p_base = malloc( tables_size );
 125     if( p_vout->yuv.p_base == NULL )
 126     {
 127         intf_ErrMsg("error: %s", strerror(ENOMEM));
 128         return( 1 );
 129     }
 130
 131     /* Allocate memory for conversion buffer and offset array */
 132     p_vout->yuv.p_buffer = malloc( VOUT_MAX_WIDTH * p_vout->i_bytes_per_pixel );
 133     if( p_vout->yuv.p_buffer == NULL )
 134     {
 135         intf_ErrMsg("error: %s", strerror(ENOMEM));
 136         free( p_vout->yuv.p_base );
 137         return( 1 );
 138     }
 139
 140     /* In 8bpp we have a twice as big offset table because we also
 141      * need the offsets for U and V (not only Y) */
 142     p_vout->yuv.p_offset = malloc( p_vout->i_width * sizeof( int ) *
 143                              ( ( p_vout->i_bytes_per_pixel == 1 ) ? 2 : 1 ) );
 144     if( p_vout->yuv.p_offset == NULL )
 145     {
 146         intf_ErrMsg("error: %s", strerror(ENOMEM));
 147         free( p_vout->yuv.p_base );
 148         free( p_vout->yuv.p_buffer );
 149         return( 1 );
 150     }
 151
 152     /* Initialize tables */
 153     SetYUV( p_vout );
 154     return( 0 );
 155 }
 156
 157 /*****************************************************************************
 158  * yuv_End: destroy translations tables
 159  *****************************************************************************
 160  * Free memory allocated by yuv_CCreate.
 161  *****************************************************************************/
 162 static void yuv_End( vout_thread_t *p_vout )
 163 {
 164     free( p_vout->yuv.p_base );
 165     free( p_vout->yuv.p_buffer );
 166     free( p_vout->yuv.p_offset );
 167 }
 168
 169 /*****************************************************************************
 170  * yuv_Reset: re-initialize translations tables
 171  *****************************************************************************
 172  * This function will initialize the tables allocated by vout_CreateTables and
 173  * set functions pointers.
 174  *****************************************************************************/
 175 static int yuv_Reset( vout_thread_t *p_vout )
 176 {
 177     yuv_End( p_vout );
 178     return( yuv_Init( p_vout ) );
 179 }
 180
 181 /*****************************************************************************
 182  * SetGammaTable: return intensity table transformed by gamma curve.
 183  *****************************************************************************
 184  * pi_table is a table of 256 entries from 0 to 255.
 185  *****************************************************************************/
 186 static void SetGammaTable( int *pi_table, double f_gamma )
 187 {
 188     int         i_y;                                       /* base intensity */
 189
 190     /* Use exp(gamma) instead of gamma */
 191     f_gamma = exp( f_gamma );
 192
 193     /* Build gamma table */
 194     for( i_y = 0; i_y < 256; i_y++ )
 195     {
 196         pi_table[ i_y ] = pow( (double)i_y / 256, f_gamma ) * 256;
 197     }
 198  }
 199
 200 /*****************************************************************************
 201  * SetYUV: compute tables and set function pointers
 202  *****************************************************************************/
 203 static void SetYUV( vout_thread_t *p_vout )
 204 {
 205     int         pi_gamma[256];                                /* gamma table */
 206     int         i_index;                                  /* index in tables */
 207
 208     /* Build gamma table */
 209     SetGammaTable( pi_gamma, p_vout->f_gamma );
 210
 211     /*
 212      * Set pointers and build YUV tables
 213      */
 214     if( p_vout->b_grayscale )
 215     {
 216         /* Grayscale: build gray table */
 217         switch( p_vout->i_bytes_per_pixel )
 218         {
 219         case 1:
 220             {
 221                 u16 bright[256], transp[256];
 222
 223                 p_vout->yuv.yuv.p_gray8 =  (u8 *)p_vout->yuv.p_base + GRAY_MARGIN;
 224                 for( i_index = 0; i_index < GRAY_MARGIN; i_index++ )
 225                 {
 226                     p_vout->yuv.yuv.p_gray8[ -i_index ] =      RGB2PIXEL( p_vout, pi_gamma[0], pi_gamma[0], pi_gamma[0] );
 227                     p_vout->yuv.yuv.p_gray8[ 256 + i_index ] = RGB2PIXEL( p_vout, pi_gamma[255], pi_gamma[255], pi_gamma[255] );
 228                 }
 229                 for( i_index = 0; i_index < 256; i_index++)
 230                 {
 231                     p_vout->yuv.yuv.p_gray8[ i_index ] = pi_gamma[ i_index ];
 232                     bright[ i_index ] = i_index << 8;
 233                     transp[ i_index ] = 0;
 234                 }
 235                 /* the colors have been allocated, we can set the palette */
 236                 p_vout->pf_setpalette( p_vout, bright, bright, bright, transp );
 237                 p_vout->i_white_pixel = 0xff;
 238                 p_vout->i_black_pixel = 0x00;
 239                 p_vout->i_gray_pixel = 0x44;
 240                 p_vout->i_blue_pixel = 0x3b;
 241
 242                 break;
 243             }
 244         case 2:
 245             p_vout->yuv.yuv.p_gray16 =  (u16 *)p_vout->yuv.p_base + GRAY_MARGIN;
 246             for( i_index = 0; i_index < GRAY_MARGIN; i_index++ )
 247             {
 248                 p_vout->yuv.yuv.p_gray16[ -i_index ] =      RGB2PIXEL( p_vout, pi_gamma[0], pi_gamma[0], pi_gamma[0] );
 249                 p_vout->yuv.yuv.p_gray16[ 256 + i_index ] = RGB2PIXEL( p_vout, pi_gamma[255], pi_gamma[255], pi_gamma[255] );
 250             }
 251             for( i_index = 0; i_index < 256; i_index++)
 252             {
 253                 p_vout->yuv.yuv.p_gray16[ i_index ] = RGB2PIXEL( p_vout, pi_gamma[i_index], pi_gamma[i_index], pi_gamma[i_index] );
 254             }
 255             break;
 256         case 3:
 257         case 4:
 258             p_vout->yuv.yuv.p_gray32 =  (u32 *)p_vout->yuv.p_base + GRAY_MARGIN;
 259             for( i_index = 0; i_index < GRAY_MARGIN; i_index++ )
 260             {
 261                 p_vout->yuv.yuv.p_gray32[ -i_index ] =      RGB2PIXEL( p_vout, pi_gamma[0], pi_gamma[0], pi_gamma[0] );
 262                 p_vout->yuv.yuv.p_gray32[ 256 + i_index ] = RGB2PIXEL( p_vout, pi_gamma[255], pi_gamma[255], pi_gamma[255] );
 263             }
 264             for( i_index = 0; i_index < 256; i_index++)
 265             {
 266                 p_vout->yuv.yuv.p_gray32[ i_index ] = RGB2PIXEL( p_vout, pi_gamma[i_index], pi_gamma[i_index], pi_gamma[i_index] );
 267             }
 268             break;
 269          }
 270     }
 271     else
 272     {
 273         /* Color: build red, green and blue tables */
 274         switch( p_vout->i_bytes_per_pixel )
 275         {
 276         case 1:
 277             {
 278                 #define RGB_MIN 0
 279                 #define RGB_MAX 255
 280                 #define CLIP( x ) ( ((x < 0) ? 0 : (x > 255) ? 255 : x) << 8 )
 281
 282                 int y,u,v;
 283                 int r,g,b;
 284                 int uvr, uvg, uvb;
 285                 int i = 0, j = 0;
 286                 u16 red[256], green[256], blue[256], transp[256];
 287                 unsigned char lookup[PALETTE_TABLE_SIZE];
 288
 289                 p_vout->yuv.yuv.p_rgb8 = (u8 *)p_vout->yuv.p_base;
 290
 291                 /* this loop calculates the intersection of an YUV box
 292                  * and the RGB cube. */
 293                 for ( y = 0; y <= 256; y += 16 )
 294                 {
 295                     for ( u = 0; u <= 256; u += 32 )
 296                     for ( v = 0; v <= 256; v += 32 )
 297                     {
 298                         uvr = (V_RED_COEF*(v-128)) >> SHIFT;
 299                         uvg = (U_GREEN_COEF*(u-128) + V_GREEN_COEF*(v-128)) >> SHIFT;
 300                         uvb = (U_BLUE_COEF*(u-128)) >> SHIFT;
 301                         r = y + uvr;
 302                         g = y + uvg;
 303                         b = y + uvb;
 304
 305                         if( r >= RGB_MIN && g >= RGB_MIN && b >= RGB_MIN
 306                                 && r <= RGB_MAX && g <= RGB_MAX && b <= RGB_MAX )
 307                         {
 308                             /* this one should never happen unless someone fscked up my code */
 309                             if(j == 256) { intf_ErrMsg( "vout error: no colors left to build palette" ); break; }
 310
 311                             /* clip the colors */
 312                             red[j] = CLIP( r );
 313                             green[j] = CLIP( g );
 314                             blue[j] = CLIP( b );
 315                             transp[j] = 0;
 316
 317                             /* allocate color */
 318                             lookup[i] = 1;
 319                             p_vout->yuv.yuv.p_rgb8[i++] = j;
 320                             j++;
 321                         }
 322                         else
 323                         {
 324                             lookup[i] = 0;
 325                             p_vout->yuv.yuv.p_rgb8[i++] = 0;
 326                         }
 327                     }
 328                     i += 128-81;
 329                 }
 330
 331                 /* the colors have been allocated, we can set the palette */
 332                 /* there will eventually be a way to know which colors
 333                  * couldn't be allocated and try to find a replacement */
 334                 p_vout->pf_setpalette( p_vout, red, green, blue, transp );
 335
 336                 p_vout->i_white_pixel = 0xff;
 337                 p_vout->i_black_pixel = 0x00;
 338                 p_vout->i_gray_pixel = 0x44;
 339                 p_vout->i_blue_pixel = 0x3b;
 340
 341                 i = 0;
 342                 /* this loop allocates colors that got outside
 343                  * the RGB cube */
 344                 for ( y = 0; y <= 256; y += 16 )
 345                 {
 346                     for ( u = 0; u <= 256; u += 32 )
 347                     for ( v = 0; v <= 256; v += 32 )
 348                     {
 349                         int u2, v2;
 350                         int dist, mindist = 100000000;
 351
 352                         if( lookup[i] || y==0)
 353                         {
 354                             i++;
 355                             continue;
 356                         }
 357
 358                         /* heavy. yeah. */
 359                         for( u2 = 0; u2 <= 256; u2 += 32 )
 360                         for( v2 = 0; v2 <= 256; v2 += 32 )
 361                         {
 362                             j = ((y>>4)<<7) + (u2>>5)*9 + (v2>>5);
 363                             dist = (u-u2)*(u-u2) + (v-v2)*(v-v2);
 364                             if( lookup[j] )
 365                             /* find the nearest color */
 366                             if( dist < mindist )
 367                             {
 368                                 p_vout->yuv.yuv.p_rgb8[i] = p_vout->yuv.yuv.p_rgb8[j];
 369                                 mindist = dist;
 370                             }
 371                             j -= 128;
 372                             if( lookup[j] )
 373                             /* find the nearest color */
 374                             if( dist + 128 < mindist )
 375                             {
 376                                 p_vout->yuv.yuv.p_rgb8[i] = p_vout->yuv.yuv.p_rgb8[j];
 377                                 mindist = dist + 128;
 378                             }
 379                         }
 380                         i++;
 381                     }
 382                     i += 128-81;
 383                 }
 384
 385                 break;
 386             }
 387         case 2:
 388             p_vout->yuv.yuv.p_rgb16 = (u16 *)p_vout->yuv.p_base;
 389             for( i_index = 0; i_index < RED_MARGIN; i_index++ )
 390             {
 391                 p_vout->yuv.yuv.p_rgb16[RED_OFFSET - RED_MARGIN + i_index] = RGB2PIXEL( p_vout, pi_gamma[0], 0, 0 );
 392                 p_vout->yuv.yuv.p_rgb16[RED_OFFSET + 256 + i_index] =        RGB2PIXEL( p_vout, pi_gamma[255], 0, 0 );
 393             }
 394             for( i_index = 0; i_index < GREEN_MARGIN; i_index++ )
 395             {
 396                 p_vout->yuv.yuv.p_rgb16[GREEN_OFFSET - GREEN_MARGIN + i_index] = RGB2PIXEL( p_vout, 0, pi_gamma[0], 0 );
 397                 p_vout->yuv.yuv.p_rgb16[GREEN_OFFSET + 256 + i_index] =          RGB2PIXEL( p_vout, 0, pi_gamma[255], 0 );
 398             }
 399             for( i_index = 0; i_index < BLUE_MARGIN; i_index++ )
 400             {
 401                 p_vout->yuv.yuv.p_rgb16[BLUE_OFFSET - BLUE_MARGIN + i_index] = RGB2PIXEL( p_vout, 0, 0, pi_gamma[0] );
 402                 p_vout->yuv.yuv.p_rgb16[BLUE_OFFSET + BLUE_MARGIN + i_index] = RGB2PIXEL( p_vout, 0, 0, pi_gamma[255] );
 403             }
 404             for( i_index = 0; i_index < 256; i_index++ )
 405             {
 406                 p_vout->yuv.yuv.p_rgb16[RED_OFFSET + i_index] =   RGB2PIXEL( p_vout, pi_gamma[ i_index ], 0, 0 );
 407                 p_vout->yuv.yuv.p_rgb16[GREEN_OFFSET + i_index] = RGB2PIXEL( p_vout, 0, pi_gamma[ i_index ], 0 );
 408                 p_vout->yuv.yuv.p_rgb16[BLUE_OFFSET + i_index] =  RGB2PIXEL( p_vout, 0, 0, pi_gamma[ i_index ] );
 409             }
 410             break;
 411         case 3:
 412         case 4:
 413             p_vout->yuv.yuv.p_rgb32 = (u32 *)p_vout->yuv.p_base;
 414             for( i_index = 0; i_index < RED_MARGIN; i_index++ )
 415             {
 416                 p_vout->yuv.yuv.p_rgb32[RED_OFFSET - RED_MARGIN + i_index] = RGB2PIXEL( p_vout, pi_gamma[0], 0, 0 );
 417                 p_vout->yuv.yuv.p_rgb32[RED_OFFSET + 256 + i_index] =        RGB2PIXEL( p_vout, pi_gamma[255], 0, 0 );
 418             }
 419             for( i_index = 0; i_index < GREEN_MARGIN; i_index++ )
 420             {
 421                 p_vout->yuv.yuv.p_rgb32[GREEN_OFFSET - GREEN_MARGIN + i_index] = RGB2PIXEL( p_vout, 0, pi_gamma[0], 0 );
 422                 p_vout->yuv.yuv.p_rgb32[GREEN_OFFSET + 256 + i_index] =          RGB2PIXEL( p_vout, 0, pi_gamma[255], 0 );
 423             }
 424             for( i_index = 0; i_index < BLUE_MARGIN; i_index++ )
 425             {
 426                 p_vout->yuv.yuv.p_rgb32[BLUE_OFFSET - BLUE_MARGIN + i_index] = RGB2PIXEL( p_vout, 0, 0, pi_gamma[0] );
 427                 p_vout->yuv.yuv.p_rgb32[BLUE_OFFSET + BLUE_MARGIN + i_index] = RGB2PIXEL( p_vout, 0, 0, pi_gamma[255] );
 428             }
 429             for( i_index = 0; i_index < 256; i_index++ )
 430             {
 431                 p_vout->yuv.yuv.p_rgb32[RED_OFFSET + i_index] =   RGB2PIXEL( p_vout, pi_gamma[ i_index ], 0, 0 );
 432                 p_vout->yuv.yuv.p_rgb32[GREEN_OFFSET + i_index] = RGB2PIXEL( p_vout, 0, pi_gamma[ i_index ], 0 );
 433                 p_vout->yuv.yuv.p_rgb32[BLUE_OFFSET + i_index] =  RGB2PIXEL( p_vout, 0, 0, pi_gamma[ i_index ] );
 434             }
 435             break;
 436         }
 437     }
 438
 439     /*
 440      * Set functions pointers
 441      */
 442     if( p_vout->b_YCbr)
 443     {
 444         switch( p_vout->i_bytes_per_pixel)
 445         {
 446 #define _X( foo ) (vout_yuv_convert_t *) _M( foo )
 447         case 1:
 448             p_vout->yuv.pf_yuv420 = _X( ConvertYUV420YCbr8 );
 449             p_vout->yuv.pf_yuv422 = _X( ConvertYUV422YCbr8 );
 450             p_vout->yuv.pf_yuv444 = _X( ConvertYUV444YCbr8 );
 451             break;
 452
 453         case 2:
 454             p_vout->yuv.pf_yuv420 = _X( ConvertYUV420YCbr16 );
 455             p_vout->yuv.pf_yuv422 = _X( ConvertYUV422YCbr16 );
 456             p_vout->yuv.pf_yuv444 = _X( ConvertYUV444YCbr16 );
 457            break;
 458
 459         case 3:
 460             p_vout->yuv.pf_yuv420 = _X( ConvertYUV420YCbr24 );
 461             p_vout->yuv.pf_yuv422 = _X( ConvertYUV422YCbr24 );
 462             p_vout->yuv.pf_yuv444 = _X( ConvertYUV444YCbr24 );
 463              break;
 464
 465         case 4:
 466             p_vout->yuv.pf_yuv420 = _X( ConvertYUV420YCbr32 );
 467             p_vout->yuv.pf_yuv422 = _X( ConvertYUV422YCbr32 );
 468             p_vout->yuv.pf_yuv444 = _X( ConvertYUV444YCbr32 );
 469             break;
 470         }
 471 #undef _X
 472     }
 473     else if( p_vout->b_grayscale )
 474     {
 475         /* Grayscale */
 476         switch( p_vout->i_bytes_per_pixel )
 477         {
 478 #define _X( foo ) (vout_yuv_convert_t *) _M( foo )
 479         case 1:
 480             p_vout->yuv.pf_yuv420 = _X( ConvertY4Gray8 );
 481             p_vout->yuv.pf_yuv422 = _X( ConvertY4Gray8 );
 482             p_vout->yuv.pf_yuv444 = _X( ConvertY4Gray8 );
 483             break;
 484         case 2:
 485             p_vout->yuv.pf_yuv420 = _X( ConvertY4Gray16 );
 486             p_vout->yuv.pf_yuv422 = _X( ConvertY4Gray16 );
 487             p_vout->yuv.pf_yuv444 = _X( ConvertY4Gray16 );
 488             break;
 489         case 3:
 490             p_vout->yuv.pf_yuv420 = _X( ConvertY4Gray24 );
 491             p_vout->yuv.pf_yuv422 = _X( ConvertY4Gray24 );
 492             p_vout->yuv.pf_yuv444 = _X( ConvertY4Gray24 );
 493             break;
 494         case 4:
 495             p_vout->yuv.pf_yuv420 = _X( ConvertY4Gray32 );
 496             p_vout->yuv.pf_yuv422 = _X( ConvertY4Gray32 );
 497             p_vout->yuv.pf_yuv444 = _X( ConvertY4Gray32 );
 498             break;
 499 #undef _X
 500         }
 501     }
 502     else
 503     {
 504         /* Color */
 505         switch( p_vout->i_bytes_per_pixel )
 506         {
 507 #define _X( foo ) (vout_yuv_convert_t *) _M( foo )
 508         case 1:
 509             p_vout->yuv.pf_yuv420 = _X( ConvertYUV420RGB8 );
 510             p_vout->yuv.pf_yuv422 = _X( ConvertYUV422RGB8 );
 511             p_vout->yuv.pf_yuv444 = _X( ConvertYUV444RGB8 );
 512             break;
 513         case 2:
 514             p_vout->yuv.pf_yuv420 = _X( ConvertYUV420RGB16 );
 515             p_vout->yuv.pf_yuv422 = _X( ConvertYUV422RGB16 );
 516             p_vout->yuv.pf_yuv444 = _X( ConvertYUV444RGB16 );
 517             break;
 518         case 3:
 519             p_vout->yuv.pf_yuv420 = _X( ConvertYUV420RGB24 );
 520             p_vout->yuv.pf_yuv422 = _X( ConvertYUV422RGB24 );
 521             p_vout->yuv.pf_yuv444 = _X( ConvertYUV444RGB24 );
 522             break;
 523         case 4:
 524             p_vout->yuv.pf_yuv420 = _X( ConvertYUV420RGB32 );
 525             p_vout->yuv.pf_yuv422 = _X( ConvertYUV422RGB32 );
 526             p_vout->yuv.pf_yuv444 = _X( ConvertYUV444RGB32 );
 527             break;
 528 #undef _X
 529       }
 530
 531     }
 532 }
 533
 534 /*****************************************************************************
 535  * SetOffset: build offset array for conversion functions
 536  *****************************************************************************
 537  * This function will build an offset array used in later conversion functions.
 538  * It will also set horizontal and vertical scaling indicators. If b_double
 539  * is set, the p_offset structure has interleaved Y and U/V offsets.
 540  *****************************************************************************/
 541 void _M( SetOffset )( int i_width, int i_height, int i_pic_width,
 542                       int i_pic_height, boolean_t *pb_h_scaling,
 543                       int *pi_v_scaling, int *p_offset, boolean_t b_double )
 544 {
 545     int i_x;                                    /* x position in destination */
 546     int i_scale_count;                                     /* modulo counter */
 547
 548     /*
 549      * Prepare horizontal offset array
 550      */
 551     if( i_pic_width - i_width == 0 )
 552     {
 553         /* No horizontal scaling: YUV conversion is done directly to picture */
 554         *pb_h_scaling = 0;
 555     }
 556     else if( i_pic_width - i_width > 0 )
 557     {
 558         /* Prepare scaling array for horizontal extension */
 559         *pb_h_scaling = 1;
 560         i_scale_count = i_pic_width;
 561         if( !b_double )
 562         {
 563             for( i_x = i_width; i_x--; )
 564             {
 565                 while( (i_scale_count -= i_width) > 0 )
 566                 {
 567                     *p_offset++ = 0;
 568                 }
 569                 *p_offset++ = 1;
 570                 i_scale_count += i_pic_width;
 571             }
 572         }
 573         else
 574         {
 575             int i_dummy = 0;
 576             for( i_x = i_width; i_x--; )
 577             {
 578                 while( (i_scale_count -= i_width) > 0 )
 579                 {
 580                     *p_offset++ = 0;
 581                     *p_offset++ = 0;
 582                 }
 583                 *p_offset++ = 1;
 584                 *p_offset++ = i_dummy;
 585                 i_dummy = 1 - i_dummy;
 586                 i_scale_count += i_pic_width;
 587             }
 588         }
 589     }
 590     else /* if( i_pic_width - i_width < 0 ) */
 591     {
 592         /* Prepare scaling array for horizontal reduction */
 593         *pb_h_scaling = 1;
 594         i_scale_count = i_width;
 595         if( !b_double )
 596         {
 597            for( i_x = i_pic_width; i_x--; )
 598             {
 599                 *p_offset = 1;
 600                 while( (i_scale_count -= i_pic_width) > 0 )
 601                 {
 602                     *p_offset += 1;
 603                 }
 604                 p_offset++;
 605                 i_scale_count += i_width;
 606             }
 607         }
 608         else
 609         {
 610             int i_remainder = 0;
 611             int i_jump;
 612             for( i_x = i_pic_width; i_x--; )
 613             {
 614                 i_jump = 1;
 615                 while( (i_scale_count -= i_pic_width) > 0 )
 616                 {
 617                     i_jump += 1;
 618                 }
 619                 *p_offset++ = i_jump;
 620                 *p_offset++ = ( i_jump += i_remainder ) >> 1;
 621                 i_remainder = i_jump & 1;
 622                 i_scale_count += i_width;
 623             }
 624         }
 625      }
 626
 627     /*
 628      * Set vertical scaling indicator
 629      */
 630     if( i_pic_height - i_height == 0 )
 631     {
 632         *pi_v_scaling = 0;
 633     }
 634     else if( i_pic_height - i_height > 0 )
 635     {
 636         *pi_v_scaling = 1;
 637     }
 638     else /* if( i_pic_height - i_height < 0 ) */
 639     {
 640         *pi_v_scaling = -1;
 641     }
 642 }
 643