modules/video_chroma/yuvp.c

   1 /*****************************************************************************
   2  * yuvp.c: YUVP to YUVA/RGBA chroma converter
   3  *****************************************************************************
   4  * Copyright (C) 2008 VLC authors and VideoLAN
   5  * $Id$
   6  *
   7  * Authors: Laurent Aimar < fenrir @ videolan.org >
   8  *
   9  * This program is free software; you can redistribute it and/or modify it
  10  * under the terms of the GNU Lesser General Public License as published by
  11  * the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public License
  20  * along with this program; if not, write to the Free Software Foundation,
  21  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27 #ifdef HAVE_CONFIG_H
  28 # include "config.h"
  29 #endif
  30
  31 #include <vlc_common.h>
  32 #include <vlc_plugin.h>
  33 #include <vlc_filter.h>
  34 #include <vlc_picture.h>
  35 #include <assert.h>
  36
  37 /* TODO:
  38  *  Add anti-aliasing support (specially for DVD where only 4 colors are used)
  39  */
  40
  41 /*****************************************************************************
  42  * Module descriptor
  43  *****************************************************************************/
  44 static int  Open ( vlc_object_t * );
  45 static void Close( vlc_object_t * );
  46
  47 vlc_module_begin ()
  48     set_description( N_("YUVP converter") )
  49     set_capability( "video converter", 10 )
  50     set_callbacks( Open, Close )
  51 vlc_module_end ()
  52
  53 /****************************************************************************
  54  * Local prototypes
  55  ****************************************************************************/
  56 static picture_t *Filter( filter_t *, picture_t * );
  57 static void Yuv2Rgb( uint8_t *r, uint8_t *g, uint8_t *b, int y1, int u1, int v1 );
  58
  59 /*****************************************************************************
  60  * Open: probe the filter and return score
  61  *****************************************************************************/
  62 static int Open( vlc_object_t *p_this )
  63 {
  64     filter_t *p_filter = (filter_t*)p_this;
  65
  66     /* It only supports YUVP to YUVA/RGBA without scaling
  67      * (if scaling is required another filter can do it) */
  68     if( p_filter->fmt_in.video.i_chroma != VLC_CODEC_YUVP ||
  69         ( p_filter->fmt_out.video.i_chroma != VLC_CODEC_YUVA &&
  70           p_filter->fmt_out.video.i_chroma != VLC_CODEC_RGBA &&
  71           p_filter->fmt_out.video.i_chroma != VLC_CODEC_ARGB ) ||
  72         p_filter->fmt_in.video.i_width  != p_filter->fmt_out.video.i_width ||
  73         p_filter->fmt_in.video.i_height != p_filter->fmt_out.video.i_height ||
  74         p_filter->fmt_in.video.orientation != p_filter->fmt_out.video.orientation )
  75     {
  76         return VLC_EGENERIC;
  77     }
  78
  79     p_filter->pf_video_filter = Filter;
  80
  81     msg_Dbg( p_filter, "YUVP to %4.4s converter",
  82              (const char*)&p_filter->fmt_out.video.i_chroma );
  83
  84     return VLC_SUCCESS;
  85 }
  86
  87 /*****************************************************************************
  88  * Close: clean up the filter
  89  *****************************************************************************/
  90 static void Close( vlc_object_t *p_this )
  91 {
  92     VLC_UNUSED(p_this );
  93 }
  94
  95 /****************************************************************************
  96  * Filter: the whole thing
  97  ****************************************************************************/
  98 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
  99 {
 100     picture_t *p_out;
 101
 102     if( !p_pic )
 103         return NULL;
 104
 105     const video_palette_t *p_yuvp = p_filter->fmt_in.video.p_palette;
 106
 107     assert( p_yuvp != NULL );
 108     assert( p_filter->fmt_in.video.i_chroma == VLC_CODEC_YUVP );
 109     assert( p_filter->fmt_in.video.i_width == p_filter->fmt_out.video.i_width );
 110     assert( p_filter->fmt_in.video.i_height == p_filter->fmt_out.video.i_height );
 111
 112     /* Request output picture */
 113     p_out = filter_NewPicture( p_filter );
 114     if( !p_out )
 115     {
 116         picture_Release( p_pic );
 117         return NULL;
 118     }
 119
 120     if( p_filter->fmt_out.video.i_chroma == VLC_CODEC_YUVA )
 121     {
 122         for( unsigned int y = 0; y < p_filter->fmt_in.video.i_height; y++ )
 123         {
 124             const uint8_t *p_line = &p_pic->p->p_pixels[y*p_pic->p->i_pitch];
 125             uint8_t *p_y = &p_out->Y_PIXELS[y*p_out->Y_PITCH];
 126             uint8_t *p_u = &p_out->U_PIXELS[y*p_out->U_PITCH];
 127             uint8_t *p_v = &p_out->V_PIXELS[y*p_out->V_PITCH];
 128             uint8_t *p_a = &p_out->A_PIXELS[y*p_out->A_PITCH];
 129
 130             for( unsigned int x = 0; x < p_filter->fmt_in.video.i_width; x++ )
 131             {
 132                 const int v = p_line[x];
 133
 134                 if( v > p_yuvp->i_entries )  /* maybe assert ? */
 135                     continue;
 136
 137                 p_y[x] = p_yuvp->palette[v][0];
 138                 p_u[x] = p_yuvp->palette[v][1];
 139                 p_v[x] = p_yuvp->palette[v][2];
 140                 p_a[x] = p_yuvp->palette[v][3];
 141             }
 142         }
 143     }
 144     else
 145     {
 146         video_palette_t rgbp;
 147
 148         assert( p_filter->fmt_out.video.i_chroma == VLC_CODEC_ARGB ||
 149                 p_filter->fmt_out.video.i_chroma == VLC_CODEC_RGBA );
 150         /* Create a RGBA palette */
 151         rgbp.i_entries = p_yuvp->i_entries;
 152         const uint8_t r = p_filter->fmt_out.video.i_chroma == VLC_CODEC_ARGB ? 1 : 0;
 153         const uint8_t g = p_filter->fmt_out.video.i_chroma == VLC_CODEC_ARGB ? 2 : 1;
 154         const uint8_t b = p_filter->fmt_out.video.i_chroma == VLC_CODEC_ARGB ? 3 : 2;
 155         const uint8_t a = p_filter->fmt_out.video.i_chroma == VLC_CODEC_ARGB ? 0 : 3;
 156         for( int i = 0; i < p_yuvp->i_entries; i++ )
 157         {
 158             if( p_yuvp->palette[i][3] == 0 )
 159             {
 160                 memset( rgbp.palette[i], 0, sizeof( rgbp.palette[i] ) );
 161                 continue;
 162             }
 163             Yuv2Rgb( &rgbp.palette[i][r], &rgbp.palette[i][g], &rgbp.palette[i][b],
 164                      p_yuvp->palette[i][0], p_yuvp->palette[i][1], p_yuvp->palette[i][2] );
 165             rgbp.palette[i][a] = p_yuvp->palette[i][3];
 166         }
 167
 168         for( unsigned int y = 0; y < p_filter->fmt_in.video.i_height; y++ )
 169         {
 170             const uint8_t *p_line = &p_pic->p->p_pixels[y*p_pic->p->i_pitch];
 171             uint8_t *p_pixels = &p_out->p->p_pixels[y*p_out->p->i_pitch];
 172
 173             for( unsigned int x = 0; x < p_filter->fmt_in.video.i_width; x++ )
 174             {
 175                 const int v = p_line[x];
 176
 177                 if( v >= rgbp.i_entries )  /* maybe assert ? */
 178                     continue;
 179
 180                 p_pixels[4*x+0] = rgbp.palette[v][0];
 181                 p_pixels[4*x+1] = rgbp.palette[v][1];
 182                 p_pixels[4*x+2] = rgbp.palette[v][2];
 183                 p_pixels[4*x+3] = rgbp.palette[v][3];
 184             }
 185         }
 186
 187     }
 188
 189     picture_CopyProperties( p_out, p_pic );
 190     picture_Release( p_pic );
 191     return p_out;
 192 }
 193
 194 /* FIXME copied from blend.c */
 195 static inline uint8_t vlc_uint8( int v )
 196 {
 197     if( v > 255 )
 198         return 255;
 199     else if( v < 0 )
 200         return 0;
 201     return v;
 202 }
 203 static void Yuv2Rgb( uint8_t *r, uint8_t *g, uint8_t *b, int y1, int u1, int v1 )
 204 {
 205     /* macros used for YUV pixel conversions */
 206 #   define SCALEBITS 10
 207 #   define ONE_HALF  (1 << (SCALEBITS - 1))
 208 #   define FIX(x)    ((int) ((x) * (1<<SCALEBITS) + 0.5))
 209
 210     int y, cb, cr, r_add, g_add, b_add;
 211
 212     cb = u1 - 128;
 213     cr = v1 - 128;
 214     r_add = FIX(1.40200*255.0/224.0) * cr + ONE_HALF;
 215     g_add = - FIX(0.34414*255.0/224.0) * cb
 216             - FIX(0.71414*255.0/224.0) * cr + ONE_HALF;
 217     b_add = FIX(1.77200*255.0/224.0) * cb + ONE_HALF;
 218     y = (y1 - 16) * FIX(255.0/219.0);
 219     *r = vlc_uint8( (y + r_add) >> SCALEBITS );
 220     *g = vlc_uint8( (y + g_add) >> SCALEBITS );
 221     *b = vlc_uint8( (y + b_add) >> SCALEBITS );
 222 #undef FIX
 223 }