git.sesse.net Git - vlc/blob - modules/video_filter/posterize.c

   1 /*****************************************************************************
   2  * posterize.c : Posterize video plugin for vlc
   3  *****************************************************************************
   4  * Copyright (C) 2010 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Branko Kokanovic <branko.kokanovic@gmail.com>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27
  28 #ifdef HAVE_CONFIG_H
  29 # include "config.h"
  30 #endif
  31
  32 #include <vlc_common.h>
  33 #include <vlc_plugin.h>
  34
  35 #include <assert.h>
  36 #include <vlc_filter.h>
  37 #include "filter_picture.h"
  38
  39 /*****************************************************************************
  40  * Local prototypes
  41  *****************************************************************************/
  42 static int  Create      ( vlc_object_t * );
  43 static void Destroy     ( vlc_object_t * );
  44
  45 static picture_t *Filter( filter_t *, picture_t * );
  46 static void PlanarYUVPosterize( picture_t *, picture_t *, int);
  47 static void PackedYUVPosterize( picture_t *, picture_t *, int);
  48 static void RVPosterize( picture_t *, picture_t *, bool, int );
  49 static void YuvPosterization( uint8_t *, uint8_t *, uint8_t *, uint8_t *,
  50                     uint8_t, uint8_t, uint8_t, uint8_t, int );
  51
  52 static const char *const ppsz_filter_options[] = {
  53     "level", NULL
  54 };
  55
  56 /*****************************************************************************
  57  * Module descriptor
  58  *****************************************************************************/
  59 #define POSTERIZE_LEVEL_TEXT N_("Posterize level")
  60 #define POSTERIZE_LEVEL_LONGTEXT N_("Posterize level "\
  61                     "(number of colors is cube of this value)" )
  62
  63 #define CFG_PREFIX "posterize-"
  64
  65 vlc_module_begin ()
  66     set_description( N_("Posterize video filter") )
  67     set_shortname( N_("Posterize" ) )
  68     set_help( N_("Posterize video by lowering the number of colors") )
  69     set_category( CAT_VIDEO )
  70     set_subcategory( SUBCAT_VIDEO_VFILTER )
  71     set_capability( "video filter2", 0 )
  72     add_integer_with_range( CFG_PREFIX "level", 6, 2, 256, NULL,
  73                            POSTERIZE_LEVEL_TEXT, POSTERIZE_LEVEL_LONGTEXT,
  74                            false )
  75     set_callbacks( Create, Destroy )
  76 vlc_module_end ()
  77
  78 /*****************************************************************************
  79  * callback prototypes
  80  *****************************************************************************/
  81 static int FilterCallback( vlc_object_t *, char const *,
  82                            vlc_value_t, vlc_value_t, void * );
  83
  84 /*****************************************************************************
  85  * filter_sys_t: adjust filter method descriptor
  86  *****************************************************************************/
  87 struct filter_sys_t
  88 {
  89     int i_level;
  90     vlc_mutex_t lock;
  91 };
  92
  93 /*****************************************************************************
  94  * Create: allocates Posterize video thread output method
  95  *****************************************************************************
  96  * This function allocates and initializes a Posterize vout method.
  97  *****************************************************************************/
  98 static int Create( vlc_object_t *p_this )
  99 {
 100     filter_t *p_filter = (filter_t *)p_this;
 101     filter_sys_t *p_sys;
 102
 103     switch( p_filter->fmt_in.video.i_chroma )
 104     {
 105         CASE_PLANAR_YUV_SQUARE
 106             break;
 107         CASE_PACKED_YUV_422
 108             break;
 109         case VLC_CODEC_RGB24:
 110             break;
 111         case VLC_CODEC_RGB32:
 112             break;
 113         default:
 114             msg_Err( p_filter, "Unsupported input chroma (%4.4s)",
 115                      (char*)&(p_filter->fmt_in.video.i_chroma) );
 116             return VLC_EGENERIC;
 117     }
 118
 119     if( p_filter->fmt_in.video.i_chroma != p_filter->fmt_out.video.i_chroma )
 120     {
 121         msg_Err( p_filter, "Input and output chromas don't match" );
 122         return VLC_EGENERIC;
 123     }
 124
 125     /* Allocate structure */
 126     p_sys = p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
 127     if( p_filter->p_sys == NULL )
 128         return VLC_ENOMEM;
 129
 130     config_ChainParse( p_filter, CFG_PREFIX, ppsz_filter_options,
 131                        p_filter->p_cfg );
 132     p_sys->i_level = var_CreateGetIntegerCommand( p_filter, CFG_PREFIX "level" );
 133
 134     vlc_mutex_init( &p_sys->lock );
 135
 136     var_AddCallback( p_filter, CFG_PREFIX "level", FilterCallback, NULL );
 137
 138     p_filter->pf_video_filter = Filter;
 139
 140     return VLC_SUCCESS;
 141 }
 142
 143 /*****************************************************************************
 144  * Destroy: destroy Posterize video thread output method
 145  *****************************************************************************
 146  * Terminate an output method created by PosterizeCreateOutputMethod
 147  *****************************************************************************/
 148 static void Destroy( vlc_object_t *p_this )
 149 {
 150     filter_t *p_filter = (filter_t *)p_this;
 151
 152     var_DelCallback( p_filter, CFG_PREFIX "level", FilterCallback, NULL );
 153
 154     vlc_mutex_destroy( &p_filter->p_sys->lock );
 155     free( p_filter->p_sys );
 156 }
 157
 158 /*****************************************************************************
 159  * Render: displays previously rendered output
 160  *****************************************************************************
 161  * This function send the currently rendered image to Posterize image, waits
 162  * until it is displayed and switch the two rendering buffers, preparing next
 163  * frame.
 164  *****************************************************************************/
 165 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
 166 {
 167     picture_t *p_outpic;
 168     int level;
 169
 170     if( !p_pic ) return NULL;
 171
 172     filter_sys_t *p_sys = p_filter->p_sys;
 173     vlc_mutex_lock( &p_sys->lock );
 174     level = p_sys->i_level;
 175     vlc_mutex_unlock( &p_sys->lock );
 176
 177     p_outpic = filter_NewPicture( p_filter );
 178     if( !p_outpic )
 179     {
 180         msg_Warn( p_filter, "can't get output picture" );
 181         picture_Release( p_pic );
 182         return NULL;
 183     }
 184
 185     switch( p_pic->format.i_chroma )
 186     {
 187         case VLC_CODEC_RGB24:
 188             RVPosterize( p_pic, p_outpic, false, level );
 189             break;
 190         case VLC_CODEC_RGB32:
 191             RVPosterize( p_pic, p_outpic, true, level );
 192             break;
 193         CASE_PLANAR_YUV_SQUARE
 194             PlanarYUVPosterize( p_pic, p_outpic, level );
 195             break;
 196         CASE_PACKED_YUV_422
 197             PackedYUVPosterize( p_pic, p_outpic, level );
 198             break;
 199         default:
 200             assert( false );
 201     }
 202
 203     return CopyInfoAndRelease( p_outpic, p_pic );
 204 }
 205
 206 /*****************************************************************************
 207  * For a given level, calculates new posterized value for pixel whose value x
 208  * is in range of 0-255
 209  *****************************************************************************/
 210 #define POSTERIZE_PIXEL(x, level) \
 211        (((( x * level ) >> 8 ) * 255 ) / ( level - 1 ))
 212
 213 /*****************************************************************************
 214  * PlanarYUVPosterize: Posterize one frame of the planar YUV video
 215  *****************************************************************************
 216  * This function posterizes one frame of the video by iterating through video
 217  * lines. In every pass, start of Y, U and V planes is calculated and for
 218  * every pixel we calculate new values of YUV values.
 219  *****************************************************************************/
 220 static void PlanarYUVPosterize( picture_t *p_pic, picture_t *p_outpic,
 221                                int i_level )
 222 {
 223     uint8_t *p_in_y, *p_in_u, *p_in_v, *p_in_end_y, *p_line_end_y, *p_out_y,
 224             *p_out_u, *p_out_v;
 225     int i_current_line = 0;
 226
 227     p_in_y = p_pic->p[Y_PLANE].p_pixels;
 228     p_in_end_y = p_in_y + p_pic->p[Y_PLANE].i_visible_lines
 229         * p_pic->p[Y_PLANE].i_pitch;
 230     p_out_y = p_outpic->p[Y_PLANE].p_pixels;
 231
 232     /* iterate for every visible line in the frame */
 233     while( p_in_y < p_in_end_y )
 234     {
 235         p_line_end_y = p_in_y + p_pic->p[Y_PLANE].i_visible_pitch;
 236         /* calculate start of U plane line */
 237         p_in_u = p_pic->p[U_PLANE].p_pixels
 238             + p_pic->p[U_PLANE].i_pitch * ( i_current_line / 2 );
 239         p_out_u = p_outpic->p[U_PLANE].p_pixels
 240             + p_outpic->p[U_PLANE].i_pitch * ( i_current_line / 2 );
 241         /* calculate start of V plane line */
 242         p_in_v = p_pic->p[V_PLANE].p_pixels
 243             + p_pic->p[V_PLANE].i_pitch * ( i_current_line / 2 );
 244         p_out_v = p_outpic->p[V_PLANE].p_pixels
 245             + p_outpic->p[V_PLANE].i_pitch * ( i_current_line / 2 );
 246         /* iterate for every two pixels in line */
 247         while( p_in_y < p_line_end_y )
 248         {
 249             uint8_t y1, y2, u, v;
 250             uint8_t posterized_y1, posterized_y2, posterized_u, posterized_v;
 251             /* retrieve original YUV values */
 252             y1 = *p_in_y++;
 253             y2 = *p_in_y++;
 254             u = *p_in_u++;
 255             v = *p_in_v++;
 256             /* do posterization */
 257             YuvPosterization( &posterized_y1, &posterized_y2, &posterized_u,
 258                              &posterized_v, y1, y2, u, v, i_level );
 259             /* put posterized valued */
 260             *p_out_y++ = posterized_y1;
 261             *p_out_y++ = posterized_y2;
 262             *p_out_u++ = posterized_u;
 263             *p_out_v++ = posterized_v;
 264         }
 265         p_in_y += p_pic->p[Y_PLANE].i_pitch
 266             - p_pic->p[Y_PLANE].i_visible_pitch;
 267         p_out_y += p_outpic->p[Y_PLANE].i_pitch
 268             - p_outpic->p[Y_PLANE].i_visible_pitch;
 269         i_current_line++;
 270     }
 271 }
 272
 273 /*****************************************************************************
 274  * PackedYUVPosterize: Posterize one frame of the packed YUV video
 275  *****************************************************************************
 276  * This function posterizes one frame of the video by iterating through video
 277  * lines. In every pass, we calculate new values for pixels (UYVY, VYUY, YUYV
 278  * and YVYU formats are supported)
 279  *****************************************************************************/
 280 static void PackedYUVPosterize( picture_t *p_pic, picture_t *p_outpic, int i_level )
 281 {
 282     uint8_t *p_in, *p_in_end, *p_line_start, *p_line_end, *p_out;
 283     uint8_t y1, y2, u, v;
 284
 285     p_in = p_pic->p[0].p_pixels;
 286     p_in_end = p_in + p_pic->p[0].i_visible_lines
 287         * p_pic->p[0].i_pitch;
 288     p_out = p_outpic->p[0].p_pixels;
 289
 290     while( p_in < p_in_end )
 291     {
 292         p_line_start = p_in;
 293         p_line_end = p_in + p_pic->p[0].i_visible_pitch;
 294         while( p_in < p_line_end )
 295         {
 296             uint8_t posterized_y1, posterized_y2, posterized_u, posterized_v;
 297             /* extract proper pixel values */
 298             switch( p_pic->format.i_chroma )
 299             {
 300                 case VLC_CODEC_UYVY:
 301                     u = *p_in++;
 302                     y1 = *p_in++;
 303                     v = *p_in++;
 304                     y2 = *p_in++;
 305                     break;
 306                 case VLC_CODEC_VYUY:
 307                     v = *p_in++;
 308                     y1 = *p_in++;
 309                     u = *p_in++;
 310                     y2 = *p_in++;
 311                     break;
 312                 case VLC_CODEC_YUYV:
 313                     y1 = *p_in++;
 314                     u = *p_in++;
 315                     y2 = *p_in++;
 316                     v = *p_in++;
 317                     break;
 318                 case VLC_CODEC_YVYU:
 319                     y1 = *p_in++;
 320                     v = *p_in++;
 321                     y2 = *p_in++;
 322                     u = *p_in++;
 323                     break;
 324                 default:
 325                     assert( false );
 326             }
 327             /* do posterization */
 328             YuvPosterization( &posterized_y1, &posterized_y2, &posterized_u,
 329                              &posterized_v, y1, y2, u, v, i_level );
 330             /* put posterized values in proper place */
 331             switch( p_pic->format.i_chroma )
 332             {
 333                 case VLC_CODEC_UYVY:
 334                     *p_out++ = posterized_u;
 335                     *p_out++ = posterized_y1;
 336                     *p_out++ = posterized_v;
 337                     *p_out++ = posterized_y2;
 338                     break;
 339                 case VLC_CODEC_VYUY:
 340                     *p_out++ = posterized_v;
 341                     *p_out++ = posterized_y1;
 342                     *p_out++ = posterized_u;
 343                     *p_out++ = posterized_y2;
 344                     break;
 345                 case VLC_CODEC_YUYV:
 346                     *p_out++ = posterized_y1;
 347                     *p_out++ = posterized_u;
 348                     *p_out++ = posterized_y2;
 349                     *p_out++ = posterized_v;
 350                     break;
 351                 case VLC_CODEC_YVYU:
 352                     *p_out++ = posterized_y1;
 353                     *p_out++ = posterized_v;
 354                     *p_out++ = posterized_y2;
 355                     *p_out++ = posterized_u;
 356                     break;
 357                 default:
 358                     assert( false );
 359             }
 360         }
 361         p_in += p_pic->p[0].i_pitch - p_pic->p[0].i_visible_pitch;
 362         p_out += p_outpic->p[0].i_pitch
 363             - p_outpic->p[0].i_visible_pitch;
 364     }
 365 }
 366
 367 /*****************************************************************************
 368  * RVPosterize: Posterize one frame of the RV24/RV32 video
 369  *****************************************************************************
 370  * This function posterizes one frame of the video by iterating through video
 371  * lines and calculating new values for every byte in chunks of 3 (RV24) or
 372  * 4 (RV32) bytes
 373  *****************************************************************************/
 374 static void RVPosterize( picture_t *p_pic, picture_t *p_outpic,
 375                                  bool rv32, int level )
 376 {
 377     uint8_t *p_in, *p_in_end, *p_line_start, *p_line_end, *p_out, pixel;
 378
 379     p_in = p_pic->p[0].p_pixels;
 380     p_in_end = p_in + p_pic->p[0].i_visible_lines
 381         * p_pic->p[0].i_pitch;
 382     p_out = p_outpic->p[0].p_pixels;
 383
 384     while( p_in < p_in_end )
 385     {
 386         p_line_start = p_in;
 387         p_line_end = p_in + p_pic->p[0].i_visible_pitch;
 388         while( p_in < p_line_end )
 389         {
 390             pixel = *p_in++;
 391             *p_out++ = POSTERIZE_PIXEL( pixel, level );
 392             pixel = *p_in++;
 393             *p_out++ = POSTERIZE_PIXEL( pixel, level );
 394             pixel = *p_in++;
 395             *p_out++ = POSTERIZE_PIXEL( pixel, level );
 396             /* for rv32 we take 4 chunks at the time */
 397             if ( rv32 )
 398             {
 399                 pixel = *p_in++;
 400                 *p_out++ = POSTERIZE_PIXEL( pixel, level );
 401             }
 402         }
 403         p_in += p_pic->p[0].i_pitch - p_pic->p[0].i_visible_pitch;
 404         p_out += p_outpic->p[0].i_pitch
 405             - p_outpic->p[0].i_visible_pitch;
 406     }
 407 }
 408
 409 /*****************************************************************************
 410  * YuvPosterization: Lowers the color depth of YUV color space
 411  *****************************************************************************
 412  * This function lowers the color level of YUV color space to specified level
 413  * by converting YUV color values to theirs RGB equivalents, calculates new
 414  * values and then converts RGB values to YUV values again.
 415  *****************************************************************************/
 416 static void YuvPosterization( uint8_t* posterized_y1, uint8_t* posterized_y2,
 417                              uint8_t* posterized_u, uint8_t* posterized_v,
 418                              uint8_t y1, uint8_t y2, uint8_t u, uint8_t v,
 419                              int i_level ) {
 420     int r1, g1, b1; /* for y1 new value */
 421     int r2, b2, g2; /* for y2 new value */
 422     int r3, g3, b3; /* for new values of u and v */
 423     /* fist convert YUV -> RGB */
 424     yuv_to_rgb( &r1, &g1, &b1, y1, u, v );
 425     yuv_to_rgb( &r2, &g2, &b2, y1, u, v );
 426     yuv_to_rgb( &r3, &g3, &b3, ( y1 + y2 ) / 2, u, v );
 427     /* round RGB values to specified posterize level */
 428     r1 = POSTERIZE_PIXEL( r1, i_level );
 429     g1 = POSTERIZE_PIXEL( g1, i_level );
 430     b1 = POSTERIZE_PIXEL( b1, i_level );
 431     r2 = POSTERIZE_PIXEL( r2, i_level );
 432     g2 = POSTERIZE_PIXEL( g2, i_level );
 433     b2 = POSTERIZE_PIXEL( b2, i_level );
 434     r3 = POSTERIZE_PIXEL( r3, i_level );
 435     g3 = POSTERIZE_PIXEL( g3, i_level );
 436     b3 = POSTERIZE_PIXEL( b3, i_level );
 437     /* convert from calculated RGB -> YUV */
 438     *posterized_y1 = ( ( 66 * r1 + 129 * g1 +  25 * b1 + 128 ) >> 8 ) +  16;
 439     *posterized_y2 = ( ( 66 * r2 + 129 * g2 +  25 * b2 + 128 ) >> 8 ) +  16;
 440     *posterized_u = ( ( -38 * r3 -  74 * g3 + 112 * b3 + 128 ) >> 8 ) + 128;
 441     *posterized_v = ( ( 112 * r3 -  94 * g3 -  18 * b3 + 128 ) >> 8 ) + 128;
 442 }
 443
 444 static int FilterCallback ( vlc_object_t *p_this, char const *psz_var,
 445                             vlc_value_t oldval, vlc_value_t newval, void *p_data )
 446 {
 447     (void)oldval;    (void)p_data;
 448     filter_t *p_filter = (filter_t*)p_this;
 449     filter_sys_t *p_sys = p_filter->p_sys;
 450
 451     if( !strcmp( psz_var, CFG_PREFIX "level" ) )
 452     {
 453         vlc_mutex_lock( &p_sys->lock );
 454         p_sys->i_level = newval.i_int;
 455         vlc_mutex_unlock( &p_sys->lock );
 456     }
 457
 458     return VLC_SUCCESS;
 459 }