modules/video_filter/filter_picture.h

   1 /*****************************************************************************
   2  * filter_picture.h: Common picture functions for filters
   3  *****************************************************************************
   4  * Copyright (C) 2007 VLC authors and VideoLAN
   5  * $Id$
   6  *
   7  * Authors: Antoine Cellerier <dionoea at videolan dot 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 /* FIXME: do all of these really have square pixels? */
  25 #define CASE_PLANAR_YUV_SQUARE              \
  26         case VLC_CODEC_I420:   \
  27         case VLC_CODEC_J420:   \
  28         case VLC_CODEC_YV12:   \
  29         case VLC_CODEC_I411:   \
  30         case VLC_CODEC_I410:   \
  31         case VLC_CODEC_I444:   \
  32         case VLC_CODEC_J444:   \
  33         case VLC_CODEC_YUVA:
  34
  35 #define CASE_PLANAR_YUV_NONSQUARE           \
  36         case VLC_CODEC_I422:   \
  37         case VLC_CODEC_J422:
  38
  39 #define CASE_PLANAR_YUV                     \
  40         CASE_PLANAR_YUV_SQUARE              \
  41         CASE_PLANAR_YUV_NONSQUARE           \
  42
  43 #define CASE_PACKED_YUV_422                 \
  44         case VLC_CODEC_UYVY:   \
  45         case VLC_CODEC_CYUV:   \
  46         case VLC_CODEC_YUYV:   \
  47         case VLC_CODEC_YVYU:
  48
  49 static inline int GetPackedYuvOffsets( vlc_fourcc_t i_chroma,
  50     int *i_y_offset, int *i_u_offset, int *i_v_offset )
  51 {
  52     switch( i_chroma )
  53     {
  54         case VLC_CODEC_UYVY:
  55         case VLC_CODEC_CYUV: /* <-- FIXME: reverted, whatever that means */
  56             /* UYVY */
  57             *i_y_offset = 1;
  58             *i_u_offset = 0;
  59             *i_v_offset = 2;
  60             return VLC_SUCCESS;
  61         case VLC_CODEC_VYUY:
  62             /* VYUY */
  63             *i_y_offset = 1;
  64             *i_u_offset = 2;
  65             *i_v_offset = 0;
  66             return VLC_SUCCESS;
  67         case VLC_CODEC_YUYV:
  68             /* YUYV */
  69             *i_y_offset = 0;
  70             *i_u_offset = 1;
  71             *i_v_offset = 3;
  72             return VLC_SUCCESS;
  73         case VLC_CODEC_YVYU:
  74             /* YVYU */
  75             *i_y_offset = 0;
  76             *i_u_offset = 3;
  77             *i_v_offset = 1;
  78             return VLC_SUCCESS;
  79         default:
  80             return VLC_EGENERIC;
  81     }
  82 }
  83
  84 static inline int GetPackedRgbIndexes( const video_format_t *p_fmt, int *i_r_index,
  85                                       int *i_g_index, int *i_b_index )
  86 {
  87     if( p_fmt->i_chroma != VLC_CODEC_RGB24 && p_fmt->i_chroma != VLC_CODEC_RGB32 )
  88         return VLC_EGENERIC;
  89
  90 #ifdef WORDS_BIGENDIAN
  91     const int i_mask_bits = p_fmt->i_chroma == VLC_CODEC_RGB24 ? 24 : 32;
  92     *i_r_index = ( i_mask_bits - p_fmt->i_lrshift ) / 8;
  93     *i_g_index = ( i_mask_bits - p_fmt->i_lgshift ) / 8;
  94     *i_b_index = ( i_mask_bits - p_fmt->i_lbshift ) / 8;
  95 #else
  96     *i_r_index = p_fmt->i_lrshift / 8;
  97     *i_g_index = p_fmt->i_lgshift / 8;
  98     *i_b_index = p_fmt->i_lbshift / 8;
  99 #endif
 100     return VLC_SUCCESS;
 101 }
 102
 103 static inline uint8_t vlc_uint8( int v )
 104 {
 105     if( v > 255 )
 106         return 255;
 107     else if( v < 0 )
 108         return 0;
 109     return v;
 110 }
 111
 112 static inline void yuv_to_rgb( int *r, int *g, int *b,
 113                                uint8_t y1, uint8_t u1, uint8_t v1 )
 114 {
 115     /* macros used for YUV pixel conversions */
 116 #   define SCALEBITS 10
 117 #   define ONE_HALF  (1 << (SCALEBITS - 1))
 118 #   define FIX(x)    ((int) ((x) * (1<<SCALEBITS) + 0.5))
 119
 120     int y, cb, cr, r_add, g_add, b_add;
 121
 122     cb = u1 - 128;
 123     cr = v1 - 128;
 124     r_add = FIX(1.40200*255.0/224.0) * cr + ONE_HALF;
 125     g_add = - FIX(0.34414*255.0/224.0) * cb
 126             - FIX(0.71414*255.0/224.0) * cr + ONE_HALF;
 127     b_add = FIX(1.77200*255.0/224.0) * cb + ONE_HALF;
 128     y = (y1 - 16) * FIX(255.0/219.0);
 129     *r = vlc_uint8( (y + r_add) >> SCALEBITS );
 130     *g = vlc_uint8( (y + g_add) >> SCALEBITS );
 131     *b = vlc_uint8( (y + b_add) >> SCALEBITS );
 132 #undef FIX
 133 #undef ONE_HALF
 134 #undef SCALEBITS
 135 }
 136
 137 static inline void rgb_to_yuv( uint8_t *y, uint8_t *u, uint8_t *v,
 138                                int r, int g, int b )
 139 {
 140     *y = ( ( (  66 * r + 129 * g +  25 * b + 128 ) >> 8 ) + 16 );
 141     *u =   ( ( -38 * r -  74 * g + 112 * b + 128 ) >> 8 ) + 128 ;
 142     *v =   ( ( 112 * r -  94 * g -  18 * b + 128 ) >> 8 ) + 128 ;
 143 }
 144
 145 /*****************************************************************************
 146  *
 147  *****************************************************************************/
 148 static inline picture_t *CopyInfoAndRelease( picture_t *p_outpic, picture_t *p_inpic )
 149 {
 150     picture_CopyProperties( p_outpic, p_inpic );
 151
 152     picture_Release( p_inpic );
 153
 154     return p_outpic;
 155 }