git.sesse.net Git - vlc/blob - modules/video_chroma/i420_rgb.c

   1 /*****************************************************************************
   2  * i420_rgb.c : YUV to bitmap RGB conversion module for vlc
   3  *****************************************************************************
   4  * Copyright (C) 2000, 2001, 2004 VideoLAN
   5  * $Id$
   6  *
   7  * Author: Sam Hocevar <sam@zoy.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., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27 #include <math.h>                                            /* exp(), pow() */
  28 #include <string.h>                                            /* strerror() */
  29 #include <stdlib.h>                                      /* malloc(), free() */
  30
  31 #include <vlc/vlc.h>
  32 #include <vlc/vout.h>
  33
  34 #include "i420_rgb.h"
  35 #if defined (MODULE_NAME_IS_i420_rgb)
  36 #   include "i420_rgb_c.h"
  37 #endif
  38
  39 /*****************************************************************************
  40  * RGB2PIXEL: assemble RGB components to a pixel value, returns a uint32_t
  41  *****************************************************************************/
  42 #define RGB2PIXEL( p_vout, i_r, i_g, i_b )          \
  43     (((((uint32_t)i_r) >> p_vout->output.i_rrshift) \
  44                        << p_vout->output.i_lrshift) \
  45    | ((((uint32_t)i_g) >> p_vout->output.i_rgshift) \
  46                        << p_vout->output.i_lgshift) \
  47    | ((((uint32_t)i_b) >> p_vout->output.i_rbshift) \
  48                        << p_vout->output.i_lbshift))
  49
  50 /*****************************************************************************
  51  * Local and extern prototypes.
  52  *****************************************************************************/
  53 static int  Activate   ( vlc_object_t * );
  54 static void Deactivate ( vlc_object_t * );
  55
  56 #if defined (MODULE_NAME_IS_i420_rgb)
  57 static void SetGammaTable       ( int *pi_table, double f_gamma );
  58 static void SetYUV              ( vout_thread_t * );
  59 static void Set8bppPalette      ( vout_thread_t *, uint8_t * );
  60 #endif
  61
  62 /*****************************************************************************
  63  * Module descriptor.
  64  *****************************************************************************/
  65 vlc_module_begin();
  66 #if defined (MODULE_NAME_IS_i420_rgb)
  67     set_description( _("I420,IYUV,YV12 to "
  68                        "RGB2,RV15,RV16,RV24,RV32 conversions") );
  69     set_capability( "chroma", 80 );
  70 #elif defined (MODULE_NAME_IS_i420_rgb_mmx)
  71     set_description( _( "MMX I420,IYUV,YV12 to "
  72                         "RV15,RV16,RV24,RV32 conversions") );
  73     set_capability( "chroma", 100 );
  74     add_requirement( MMX );
  75 #endif
  76     set_callbacks( Activate, Deactivate );
  77 vlc_module_end();
  78
  79 /*****************************************************************************
  80  * Activate: allocate a chroma function
  81  *****************************************************************************
  82  * This function allocates and initializes a chroma function
  83  *****************************************************************************/
  84 static int Activate( vlc_object_t *p_this )
  85 {
  86     vout_thread_t *p_vout = (vout_thread_t *)p_this;
  87 #if defined (MODULE_NAME_IS_i420_rgb)
  88     size_t i_tables_size;
  89 #endif
  90
  91     if( p_vout->render.i_width & 1 || p_vout->render.i_height & 1 )
  92     {
  93         return -1;
  94     }
  95
  96     switch( p_vout->render.i_chroma )
  97     {
  98         case VLC_FOURCC('Y','V','1','2'):
  99         case VLC_FOURCC('I','4','2','0'):
 100         case VLC_FOURCC('I','Y','U','V'):
 101             switch( p_vout->output.i_chroma )
 102             {
 103 #if defined (MODULE_NAME_IS_i420_rgb)
 104                 case VLC_FOURCC('R','G','B','2'):
 105                     p_vout->chroma.pf_convert = E_(I420_RGB8);
 106                     break;
 107 #endif
 108                 case VLC_FOURCC('R','V','1','5'):
 109                 case VLC_FOURCC('R','V','1','6'):
 110 #if defined (MODULE_NAME_IS_i420_rgb_mmx)
 111                     /* If we don't have support for the bitmasks, bail out */
 112                     if( ( p_vout->output.i_rmask != 0x7c00
 113                            || p_vout->output.i_gmask != 0x03e0
 114                            || p_vout->output.i_bmask != 0x001f )
 115                      && ( p_vout->output.i_rmask != 0xf800
 116                            || p_vout->output.i_gmask != 0x07e0
 117                            || p_vout->output.i_bmask != 0x001f ) )
 118                     {
 119                         return -1;
 120                     }
 121 #endif
 122                     p_vout->chroma.pf_convert = E_(I420_RGB16);
 123                     break;
 124
 125 #ifndef WIN32 /* Hmmm, is there only X11 using 32bits per pixel for RV24 ? */
 126                 case VLC_FOURCC('R','V','2','4'):
 127 #endif
 128                 case VLC_FOURCC('R','V','3','2'):
 129 #if defined (MODULE_NAME_IS_i420_rgb_mmx)
 130                     /* If we don't have support for the bitmasks, bail out */
 131                     if( p_vout->output.i_rmask != 0x00ff0000
 132                          || p_vout->output.i_gmask != 0x0000ff00
 133                          || p_vout->output.i_bmask != 0x000000ff )
 134                     {
 135                         return -1;
 136                     }
 137 #endif
 138                     p_vout->chroma.pf_convert = E_(I420_RGB32);
 139                     break;
 140
 141                 default:
 142                     return -1;
 143             }
 144             break;
 145
 146         default:
 147             return -1;
 148     }
 149
 150     p_vout->chroma.p_sys = malloc( sizeof( chroma_sys_t ) );
 151     if( p_vout->chroma.p_sys == NULL )
 152     {
 153         return -1;
 154     }
 155
 156     switch( p_vout->output.i_chroma )
 157     {
 158 #if defined (MODULE_NAME_IS_i420_rgb)
 159         case VLC_FOURCC('R','G','B','2'):
 160             p_vout->chroma.p_sys->p_buffer = malloc( VOUT_MAX_WIDTH );
 161             break;
 162 #endif
 163
 164         case VLC_FOURCC('R','V','1','5'):
 165         case VLC_FOURCC('R','V','1','6'):
 166             p_vout->chroma.p_sys->p_buffer = malloc( VOUT_MAX_WIDTH * 2 );
 167             break;
 168
 169         case VLC_FOURCC('R','V','2','4'):
 170         case VLC_FOURCC('R','V','3','2'):
 171             p_vout->chroma.p_sys->p_buffer = malloc( VOUT_MAX_WIDTH * 4 );
 172             break;
 173
 174         default:
 175             p_vout->chroma.p_sys->p_buffer = NULL;
 176             break;
 177     }
 178
 179     if( p_vout->chroma.p_sys->p_buffer == NULL )
 180     {
 181         free( p_vout->chroma.p_sys );
 182         return -1;
 183     }
 184
 185     p_vout->chroma.p_sys->p_offset = malloc( p_vout->output.i_width
 186                     * ( ( p_vout->output.i_chroma
 187                            == VLC_FOURCC('R','G','B','2') ) ? 2 : 1 )
 188                     * sizeof( int ) );
 189     if( p_vout->chroma.p_sys->p_offset == NULL )
 190     {
 191         free( p_vout->chroma.p_sys->p_buffer );
 192         free( p_vout->chroma.p_sys );
 193         return -1;
 194     }
 195
 196 #if defined (MODULE_NAME_IS_i420_rgb)
 197     switch( p_vout->output.i_chroma )
 198     {
 199     case VLC_FOURCC('R','G','B','2'):
 200         i_tables_size = sizeof( uint8_t ) * PALETTE_TABLE_SIZE;
 201         break;
 202     case VLC_FOURCC('R','V','1','5'):
 203     case VLC_FOURCC('R','V','1','6'):
 204         i_tables_size = sizeof( uint16_t ) * RGB_TABLE_SIZE;
 205         break;
 206     default: /* RV24, RV32 */
 207         i_tables_size = sizeof( uint32_t ) * RGB_TABLE_SIZE;
 208         break;
 209     }
 210
 211     p_vout->chroma.p_sys->p_base = malloc( i_tables_size );
 212     if( p_vout->chroma.p_sys->p_base == NULL )
 213     {
 214         free( p_vout->chroma.p_sys->p_offset );
 215         free( p_vout->chroma.p_sys->p_buffer );
 216         free( p_vout->chroma.p_sys );
 217         return -1;
 218     }
 219
 220     SetYUV( p_vout );
 221 #endif
 222
 223     return 0;
 224 }
 225
 226 /*****************************************************************************
 227  * Deactivate: free the chroma function
 228  *****************************************************************************
 229  * This function frees the previously allocated chroma function
 230  *****************************************************************************/
 231 static void Deactivate( vlc_object_t *p_this )
 232 {
 233     vout_thread_t *p_vout = (vout_thread_t *)p_this;
 234
 235 #if defined (MODULE_NAME_IS_i420_rgb)
 236     free( p_vout->chroma.p_sys->p_base );
 237 #endif
 238     free( p_vout->chroma.p_sys->p_offset );
 239     free( p_vout->chroma.p_sys->p_buffer );
 240     free( p_vout->chroma.p_sys );
 241 }
 242
 243 #if defined (MODULE_NAME_IS_i420_rgb)
 244 /*****************************************************************************
 245  * SetGammaTable: return intensity table transformed by gamma curve.
 246  *****************************************************************************
 247  * pi_table is a table of 256 entries from 0 to 255.
 248  *****************************************************************************/
 249 static void SetGammaTable( int *pi_table, double f_gamma )
 250 {
 251     int i_y;                                               /* base intensity */
 252
 253     /* Use exp(gamma) instead of gamma */
 254     f_gamma = exp( f_gamma );
 255
 256     /* Build gamma table */
 257     for( i_y = 0; i_y < 256; i_y++ )
 258     {
 259         pi_table[ i_y ] = (int)( pow( (double)i_y / 256, f_gamma ) * 256 );
 260     }
 261 }
 262
 263 /*****************************************************************************
 264  * SetYUV: compute tables and set function pointers
 265  *****************************************************************************/
 266 static void SetYUV( vout_thread_t *p_vout )
 267 {
 268     int          pi_gamma[256];                               /* gamma table */
 269     volatile int i_index;                                 /* index in tables */
 270                    /* We use volatile here to work around a strange gcc-3.3.4
 271                     * optimization bug */
 272
 273     /* Build gamma table */
 274     SetGammaTable( pi_gamma, p_vout->f_gamma );
 275
 276     /*
 277      * Set pointers and build YUV tables
 278      */
 279
 280     /* Color: build red, green and blue tables */
 281     switch( p_vout->output.i_chroma )
 282     {
 283     case VLC_FOURCC('R','G','B','2'):
 284         p_vout->chroma.p_sys->p_rgb8 = (uint8_t *)p_vout->chroma.p_sys->p_base;
 285         Set8bppPalette( p_vout, p_vout->chroma.p_sys->p_rgb8 );
 286         break;
 287
 288     case VLC_FOURCC('R','V','1','5'):
 289     case VLC_FOURCC('R','V','1','6'):
 290         p_vout->chroma.p_sys->p_rgb16 = (uint16_t *)p_vout->chroma.p_sys->p_base;
 291         for( i_index = 0; i_index < RED_MARGIN; i_index++ )
 292         {
 293             p_vout->chroma.p_sys->p_rgb16[RED_OFFSET - RED_MARGIN + i_index] = RGB2PIXEL( p_vout, pi_gamma[0], 0, 0 );
 294             p_vout->chroma.p_sys->p_rgb16[RED_OFFSET + 256 + i_index] =        RGB2PIXEL( p_vout, pi_gamma[255], 0, 0 );
 295         }
 296         for( i_index = 0; i_index < GREEN_MARGIN; i_index++ )
 297         {
 298             p_vout->chroma.p_sys->p_rgb16[GREEN_OFFSET - GREEN_MARGIN + i_index] = RGB2PIXEL( p_vout, 0, pi_gamma[0], 0 );
 299             p_vout->chroma.p_sys->p_rgb16[GREEN_OFFSET + 256 + i_index] =          RGB2PIXEL( p_vout, 0, pi_gamma[255], 0 );
 300         }
 301         for( i_index = 0; i_index < BLUE_MARGIN; i_index++ )
 302         {
 303             p_vout->chroma.p_sys->p_rgb16[BLUE_OFFSET - BLUE_MARGIN + i_index] = RGB2PIXEL( p_vout, 0, 0, pi_gamma[0] );
 304             p_vout->chroma.p_sys->p_rgb16[BLUE_OFFSET + BLUE_MARGIN + i_index] = RGB2PIXEL( p_vout, 0, 0, pi_gamma[255] );
 305         }
 306         for( i_index = 0; i_index < 256; i_index++ )
 307         {
 308             p_vout->chroma.p_sys->p_rgb16[RED_OFFSET + i_index] =   RGB2PIXEL( p_vout, pi_gamma[ i_index ], 0, 0 );
 309             p_vout->chroma.p_sys->p_rgb16[GREEN_OFFSET + i_index] = RGB2PIXEL( p_vout, 0, pi_gamma[ i_index ], 0 );
 310             p_vout->chroma.p_sys->p_rgb16[BLUE_OFFSET + i_index] =  RGB2PIXEL( p_vout, 0, 0, pi_gamma[ i_index ] );
 311         }
 312         break;
 313
 314     case VLC_FOURCC('R','V','2','4'):
 315     case VLC_FOURCC('R','V','3','2'):
 316         p_vout->chroma.p_sys->p_rgb32 = (uint32_t *)p_vout->chroma.p_sys->p_base;
 317         for( i_index = 0; i_index < RED_MARGIN; i_index++ )
 318         {
 319             p_vout->chroma.p_sys->p_rgb32[RED_OFFSET - RED_MARGIN + i_index] = RGB2PIXEL( p_vout, pi_gamma[0], 0, 0 );
 320             p_vout->chroma.p_sys->p_rgb32[RED_OFFSET + 256 + i_index] =        RGB2PIXEL( p_vout, pi_gamma[255], 0, 0 );
 321         }
 322         for( i_index = 0; i_index < GREEN_MARGIN; i_index++ )
 323         {
 324             p_vout->chroma.p_sys->p_rgb32[GREEN_OFFSET - GREEN_MARGIN + i_index] = RGB2PIXEL( p_vout, 0, pi_gamma[0], 0 );
 325             p_vout->chroma.p_sys->p_rgb32[GREEN_OFFSET + 256 + i_index] =          RGB2PIXEL( p_vout, 0, pi_gamma[255], 0 );
 326         }
 327         for( i_index = 0; i_index < BLUE_MARGIN; i_index++ )
 328         {
 329             p_vout->chroma.p_sys->p_rgb32[BLUE_OFFSET - BLUE_MARGIN + i_index] = RGB2PIXEL( p_vout, 0, 0, pi_gamma[0] );
 330             p_vout->chroma.p_sys->p_rgb32[BLUE_OFFSET + BLUE_MARGIN + i_index] = RGB2PIXEL( p_vout, 0, 0, pi_gamma[255] );
 331         }
 332         for( i_index = 0; i_index < 256; i_index++ )
 333         {
 334             p_vout->chroma.p_sys->p_rgb32[RED_OFFSET + i_index] =   RGB2PIXEL( p_vout, pi_gamma[ i_index ], 0, 0 );
 335             p_vout->chroma.p_sys->p_rgb32[GREEN_OFFSET + i_index] = RGB2PIXEL( p_vout, 0, pi_gamma[ i_index ], 0 );
 336             p_vout->chroma.p_sys->p_rgb32[BLUE_OFFSET + i_index] =  RGB2PIXEL( p_vout, 0, 0, pi_gamma[ i_index ] );
 337         }
 338         break;
 339     }
 340 }
 341
 342 static void Set8bppPalette( vout_thread_t *p_vout, uint8_t *p_rgb8 )
 343 {
 344     #define CLIP( x ) ( ((x < 0) ? 0 : (x > 255) ? 255 : x) << 8 )
 345
 346     int y,u,v;
 347     int r,g,b;
 348     int i = 0, j = 0;
 349     uint16_t *p_cmap_r=p_vout->chroma.p_sys->p_rgb_r;
 350     uint16_t *p_cmap_g=p_vout->chroma.p_sys->p_rgb_g;
 351     uint16_t *p_cmap_b=p_vout->chroma.p_sys->p_rgb_b;
 352
 353     unsigned char p_lookup[PALETTE_TABLE_SIZE];
 354
 355     /* This loop calculates the intersection of an YUV box and the RGB cube. */
 356     for ( y = 0; y <= 256; y += 16, i += 128 - 81 )
 357     {
 358         for ( u = 0; u <= 256; u += 32 )
 359         {
 360             for ( v = 0; v <= 256; v += 32 )
 361             {
 362                 r = y + ( (V_RED_COEF*(v-128)) >> SHIFT );
 363                 g = y + ( (U_GREEN_COEF*(u-128)
 364                          + V_GREEN_COEF*(v-128)) >> SHIFT );
 365                 b = y + ( (U_BLUE_COEF*(u-128)) >> SHIFT );
 366
 367                 if( r >= 0x00 && g >= 0x00 && b >= 0x00
 368                         && r <= 0xff && g <= 0xff && b <= 0xff )
 369                 {
 370                     /* This one should never happen unless someone
 371                      * fscked up my code */
 372                     if( j == 256 )
 373                     {
 374                         msg_Err( p_vout, "no colors left in palette" );
 375                         break;
 376                     }
 377
 378                     /* Clip the colors */
 379                     p_cmap_r[ j ] = CLIP( r );
 380                     p_cmap_g[ j ] = CLIP( g );
 381                     p_cmap_b[ j ] = CLIP( b );
 382
 383 #if 0
 384                     printf("+++Alloc RGB cmap %d (%d, %d, %d)\n", j,
 385                            p_cmap_r[ j ] >>8, p_cmap_g[ j ] >>8,
 386                            p_cmap_b[ j ] >>8);
 387 #endif
 388
 389                     /* Allocate color */
 390                     p_lookup[ i ] = 1;
 391                     p_rgb8[ i++ ] = j;
 392                     j++;
 393                 }
 394                 else
 395                 {
 396                     p_lookup[ i ] = 0;
 397                     p_rgb8[ i++ ] = 0;
 398                 }
 399             }
 400         }
 401     }
 402
 403     /* The colors have been allocated, we can set the palette */
 404     p_vout->output.pf_setpalette( p_vout, p_cmap_r, p_cmap_g, p_cmap_b );
 405
 406 #if 0
 407     /* There will eventually be a way to know which colors
 408      * couldn't be allocated and try to find a replacement */
 409     p_vout->i_white_pixel = 0xff;
 410     p_vout->i_black_pixel = 0x00;
 411     p_vout->i_gray_pixel = 0x44;
 412     p_vout->i_blue_pixel = 0x3b;
 413 #endif
 414
 415     /* This loop allocates colors that got outside the RGB cube */
 416     for ( i = 0, y = 0; y <= 256; y += 16, i += 128 - 81 )
 417     {
 418         for ( u = 0; u <= 256; u += 32 )
 419         {
 420             for ( v = 0; v <= 256; v += 32, i++ )
 421             {
 422                 int u2, v2, dist, mindist = 100000000;
 423
 424                 if( p_lookup[ i ] || y == 0 )
 425                 {
 426                     continue;
 427                 }
 428
 429                 /* Heavy. yeah. */
 430                 for( u2 = 0; u2 <= 256; u2 += 32 )
 431                 {
 432                     for( v2 = 0; v2 <= 256; v2 += 32 )
 433                     {
 434                         j = ((y>>4)<<7) + (u2>>5)*9 + (v2>>5);
 435                         dist = (u-u2)*(u-u2) + (v-v2)*(v-v2);
 436
 437                         /* Find the nearest color */
 438                         if( p_lookup[ j ] && dist < mindist )
 439                         {
 440                             p_rgb8[ i ] = p_rgb8[ j ];
 441                             mindist = dist;
 442                         }
 443
 444                         j -= 128;
 445
 446                         /* Find the nearest color */
 447                         if( p_lookup[ j ] && dist + 128 < mindist )
 448                         {
 449                             p_rgb8[ i ] = p_rgb8[ j ];
 450                             mindist = dist + 128;
 451                         }
 452                     }
 453                 }
 454             }
 455         }
 456     }
 457 }
 458
 459 #endif
 460