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  *
   6  * Authors: Antoine Cellerier <dionoea at videolan dot org>
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU Lesser General Public License as published by
  10  * the Free Software Foundation; either version 2.1 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  16  * GNU Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public License
  19  * along with this program; if not, write to the Free Software Foundation,
  20  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  21  *****************************************************************************/
  22
  23 /* FIXME: do all of these really have square pixels? */
  24 #define CASE_PLANAR_YUV_SQUARE              \
  25         case VLC_CODEC_I420:   \
  26         case VLC_CODEC_J420:   \
  27         case VLC_CODEC_YV12:   \
  28         case VLC_CODEC_I411:   \
  29         case VLC_CODEC_I410:   \
  30         case VLC_CODEC_I444:   \
  31         case VLC_CODEC_J444:   \
  32         case VLC_CODEC_YUVA:
  33
  34 #define CASE_PLANAR_YUV_NONSQUARE           \
  35         case VLC_CODEC_I422:   \
  36         case VLC_CODEC_J422:
  37
  38 #define CASE_PLANAR_YUV10                   \
  39         case VLC_CODEC_I420_10L:            \
  40         case VLC_CODEC_I420_10B:            \
  41         case VLC_CODEC_I444_10L:            \
  42         case VLC_CODEC_I444_10B:
  43
  44 #define CASE_PLANAR_YUV9                    \
  45         case VLC_CODEC_I420_9L:             \
  46         case VLC_CODEC_I420_9B:             \
  47         case VLC_CODEC_I444_9L:             \
  48         case VLC_CODEC_I444_9B:
  49
  50 #define CASE_PLANAR_YUV                     \
  51         CASE_PLANAR_YUV_SQUARE              \
  52         CASE_PLANAR_YUV_NONSQUARE           \
  53
  54 #define CASE_PACKED_YUV_422                 \
  55         case VLC_CODEC_UYVY:   \
  56         case VLC_CODEC_YUYV:   \
  57         case VLC_CODEC_YVYU:
  58
  59 static inline int GetPackedYuvOffsets( vlc_fourcc_t i_chroma,
  60     int *i_y_offset, int *i_u_offset, int *i_v_offset )
  61 {
  62     switch( i_chroma )
  63     {
  64         case VLC_CODEC_UYVY:
  65             /* UYVY */
  66             *i_y_offset = 1;
  67             *i_u_offset = 0;
  68             *i_v_offset = 2;
  69             return VLC_SUCCESS;
  70         case VLC_CODEC_VYUY:
  71             /* VYUY */
  72             *i_y_offset = 1;
  73             *i_u_offset = 2;
  74             *i_v_offset = 0;
  75             return VLC_SUCCESS;
  76         case VLC_CODEC_YUYV:
  77             /* YUYV */
  78             *i_y_offset = 0;
  79             *i_u_offset = 1;
  80             *i_v_offset = 3;
  81             return VLC_SUCCESS;
  82         case VLC_CODEC_YVYU:
  83             /* YVYU */
  84             *i_y_offset = 0;
  85             *i_u_offset = 3;
  86             *i_v_offset = 1;
  87             return VLC_SUCCESS;
  88         default:
  89             return VLC_EGENERIC;
  90     }
  91 }
  92
  93 static inline int GetPackedRgbIndexes( const video_format_t *p_fmt, int *i_r_index,
  94                                       int *i_g_index, int *i_b_index )
  95 {
  96     if( p_fmt->i_chroma != VLC_CODEC_RGB24 && p_fmt->i_chroma != VLC_CODEC_RGB32 )
  97         return VLC_EGENERIC;
  98
  99 #ifdef WORDS_BIGENDIAN
 100     const int i_mask_bits = p_fmt->i_chroma == VLC_CODEC_RGB24 ? 16 : 24;
 101     *i_r_index = (i_mask_bits - vlc_ctz(p_fmt->i_rmask)) / 8;
 102     *i_g_index = (i_mask_bits - vlc_ctz(p_fmt->i_gmask)) / 8;
 103     *i_b_index = (i_mask_bits - vlc_ctz(p_fmt->i_bmask)) / 8;
 104 #else
 105     *i_r_index = vlc_ctz(p_fmt->i_rmask) / 8;
 106     *i_g_index = vlc_ctz(p_fmt->i_gmask) / 8;
 107     *i_b_index = vlc_ctz(p_fmt->i_bmask) / 8;
 108 #endif
 109     return VLC_SUCCESS;
 110 }
 111
 112 static inline uint8_t vlc_uint8( int v )
 113 {
 114     if( v > 255 )
 115         return 255;
 116     else if( v < 0 )
 117         return 0;
 118     return v;
 119 }
 120
 121 static inline void yuv_to_rgb( int *r, int *g, int *b,
 122                                uint8_t y1, uint8_t u1, uint8_t v1 )
 123 {
 124     /* macros used for YUV pixel conversions */
 125 #   define SCALEBITS 10
 126 #   define ONE_HALF  (1 << (SCALEBITS - 1))
 127 #   define FIX(x)    ((int) ((x) * (1<<SCALEBITS) + 0.5))
 128
 129     int y, cb, cr, r_add, g_add, b_add;
 130
 131     cb = u1 - 128;
 132     cr = v1 - 128;
 133     r_add = FIX(1.40200*255.0/224.0) * cr + ONE_HALF;
 134     g_add = - FIX(0.34414*255.0/224.0) * cb
 135             - FIX(0.71414*255.0/224.0) * cr + ONE_HALF;
 136     b_add = FIX(1.77200*255.0/224.0) * cb + ONE_HALF;
 137     y = (y1 - 16) * FIX(255.0/219.0);
 138     *r = vlc_uint8( (y + r_add) >> SCALEBITS );
 139     *g = vlc_uint8( (y + g_add) >> SCALEBITS );
 140     *b = vlc_uint8( (y + b_add) >> SCALEBITS );
 141 #undef FIX
 142 #undef ONE_HALF
 143 #undef SCALEBITS
 144 }
 145
 146 static inline void rgb_to_yuv( uint8_t *y, uint8_t *u, uint8_t *v,
 147                                int r, int g, int b )
 148 {
 149     *y = ( ( (  66 * r + 129 * g +  25 * b + 128 ) >> 8 ) + 16 );
 150     *u =   ( ( -38 * r -  74 * g + 112 * b + 128 ) >> 8 ) + 128 ;
 151     *v =   ( ( 112 * r -  94 * g -  18 * b + 128 ) >> 8 ) + 128 ;
 152 }
 153
 154 /*****************************************************************************
 155  *
 156  *****************************************************************************/
 157 static inline picture_t *CopyInfoAndRelease( picture_t *p_outpic, picture_t *p_inpic )
 158 {
 159     picture_CopyProperties( p_outpic, p_inpic );
 160
 161     picture_Release( p_inpic );
 162
 163     return p_outpic;
 164 }