modules/video_chroma/i420_rgb16.c

   1 /*****************************************************************************
   2  * i420_rgb16.c : YUV to bitmap RGB conversion module for vlc
   3  *****************************************************************************
   4  * Copyright (C) 2000 VLC authors and VideoLAN
   5  *
   6  * Authors: Samuel Hocevar <sam@zoy.org>
   7  *          Damien Fouilleul <damienf@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 #ifdef HAVE_CONFIG_H
  25 # include "config.h"
  26 #endif
  27
  28 #include <vlc_common.h>
  29 #include <vlc_filter.h>
  30 #include <vlc_picture.h>
  31 #include <vlc_cpu.h>
  32
  33 #include "i420_rgb.h"
  34 #include "i420_rgb_c.h"
  35
  36 /*****************************************************************************
  37  * SetOffset: build offset array for conversion functions
  38  *****************************************************************************
  39  * This function will build an offset array used in later conversion functions.
  40  * It will also set horizontal and vertical scaling indicators.
  41  *****************************************************************************/
  42 static void SetOffset( int i_width, int i_height, int i_pic_width,
  43                        int i_pic_height, bool *pb_hscale,
  44                        unsigned int *pi_vscale, int *p_offset )
  45 {
  46     /*
  47      * Prepare horizontal offset array
  48      */
  49     if( i_pic_width - i_width == 0 )
  50     {   /* No horizontal scaling: YUV conversion is done directly to picture */
  51         *pb_hscale = 0;
  52     }
  53     else if( i_pic_width - i_width > 0 )
  54     {   /* Prepare scaling array for horizontal extension */
  55         int i_scale_count = i_pic_width;
  56
  57         *pb_hscale = 1;
  58         for( int i_x = i_width; i_x--; )
  59         {
  60             while( (i_scale_count -= i_width) > 0 )
  61             {
  62                 *p_offset++ = 0;
  63             }
  64             *p_offset++ = 1;
  65             i_scale_count += i_pic_width;
  66         }
  67     }
  68     else /* if( i_pic_width - i_width < 0 ) */
  69     {   /* Prepare scaling array for horizontal reduction */
  70         int i_scale_count = i_pic_width;
  71
  72         *pb_hscale = 1;
  73         for( int i_x = i_pic_width; i_x--; )
  74         {
  75             *p_offset = 1;
  76             while( (i_scale_count -= i_pic_width) > 0 )
  77             {
  78                 *p_offset += 1;
  79             }
  80             p_offset++;
  81             i_scale_count += i_width;
  82         }
  83     }
  84
  85     /*
  86      * Set vertical scaling indicator
  87      */
  88     if( i_pic_height - i_height == 0 )
  89         *pi_vscale = 0;
  90     else if( i_pic_height - i_height > 0 )
  91         *pi_vscale = 1;
  92     else /* if( i_pic_height - i_height < 0 ) */
  93         *pi_vscale = -1;
  94 }
  95
  96 /*****************************************************************************
  97  * I420_RGB16: color YUV 4:2:0 to RGB 16 bpp
  98  *****************************************************************************
  99  * Horizontal alignment needed:
 100  *  - input: 8 pixels (8 Y bytes, 4 U/V bytes), margins not allowed
 101  *  - output: 1 pixel (2 bytes), margins allowed
 102  * Vertical alignment needed:
 103  *  - input: 2 lines (2 Y lines, 1 U/V line)
 104  *  - output: 1 line
 105  *****************************************************************************/
 106
 107 void I420_RGB16( filter_t *p_filter, picture_t *p_src, picture_t *p_dest )
 108 {
 109     filter_sys_t *p_sys = p_filter->p_sys;
 110
 111     /* We got this one from the old arguments */
 112     uint16_t *p_pic = (uint16_t*)p_dest->p->p_pixels;
 113     uint8_t  *p_y   = p_src->Y_PIXELS;
 114     uint8_t  *p_u   = p_src->U_PIXELS;
 115     uint8_t  *p_v   = p_src->V_PIXELS;
 116
 117     bool  b_hscale;                         /* horizontal scaling type */
 118     unsigned int i_vscale;                          /* vertical scaling type */
 119     unsigned int i_x, i_y;                /* horizontal and vertical indexes */
 120
 121     int         i_right_margin;
 122     int         i_rewind;
 123     int         i_scale_count;                       /* scale modulo counter */
 124     int         i_chroma_width = (p_filter->fmt_in.video.i_x_offset + p_filter->fmt_in.video.i_visible_width) / 2; /* chroma width */
 125     uint16_t *  p_pic_start;       /* beginning of the current line for copy */
 126     int         i_uval, i_vval;                           /* U and V samples */
 127     int         i_red, i_green, i_blue;          /* U and V modified samples */
 128     uint16_t *  p_yuv = p_sys->p_rgb16;
 129     uint16_t *  p_ybase;                     /* Y dependant conversion table */
 130
 131     /* Conversion buffer pointer */
 132     uint16_t *  p_buffer_start;
 133     uint16_t *  p_buffer;
 134
 135     /* Offset array pointer */
 136     int *       p_offset_start = p_sys->p_offset;
 137     int *       p_offset;
 138
 139     const int i_source_margin = p_src->p[0].i_pitch
 140                                  - p_src->p[0].i_visible_pitch
 141                                  - p_filter->fmt_in.video.i_x_offset;
 142     const int i_source_margin_c = p_src->p[1].i_pitch
 143                                  - p_src->p[1].i_visible_pitch
 144                                  - ( p_filter->fmt_in.video.i_x_offset / 2 );
 145
 146     i_right_margin = p_dest->p->i_pitch - p_dest->p->i_visible_pitch;
 147     i_rewind = (-(p_filter->fmt_in.video.i_x_offset + p_filter->fmt_in.video.i_visible_width)) & 7;
 148
 149     /* Rule: when a picture of size (x1,y1) with aspect ratio r1 is rendered
 150      * on a picture of size (x2,y2) with aspect ratio r2, if x1 grows to x1'
 151      * then y1 grows to y1' = x1' * y2/x2 * r2/r1 */
 152     SetOffset( (p_filter->fmt_in.video.i_x_offset + p_filter->fmt_in.video.i_visible_width),
 153                (p_filter->fmt_in.video.i_y_offset + p_filter->fmt_in.video.i_visible_height),
 154                (p_filter->fmt_out.video.i_x_offset + p_filter->fmt_out.video.i_visible_width),
 155                (p_filter->fmt_out.video.i_y_offset + p_filter->fmt_out.video.i_visible_height),
 156                &b_hscale, &i_vscale, p_offset_start );
 157
 158     if(b_hscale &&
 159        AllocateOrGrow(&p_sys->p_buffer, &p_sys->i_buffer_size,
 160                       p_filter->fmt_in.video.i_x_offset +
 161                       p_filter->fmt_in.video.i_visible_width,
 162                       p_sys->i_bytespp))
 163         return;
 164     else p_buffer_start = (uint16_t*)p_sys->p_buffer;
 165
 166     /*
 167      * Perform conversion
 168      */
 169     i_scale_count = ( i_vscale == 1 ) ?
 170                     (p_filter->fmt_out.video.i_y_offset + p_filter->fmt_out.video.i_visible_height) :
 171                     (p_filter->fmt_in.video.i_y_offset + p_filter->fmt_in.video.i_visible_height);
 172     for( i_y = 0; i_y < (p_filter->fmt_in.video.i_y_offset + p_filter->fmt_in.video.i_visible_height); i_y++ )
 173     {
 174         p_pic_start = p_pic;
 175         p_buffer = b_hscale ? p_buffer_start : p_pic;
 176
 177         for ( i_x = (p_filter->fmt_in.video.i_x_offset + p_filter->fmt_in.video.i_visible_width) / 8; i_x--; )
 178         {
 179             CONVERT_YUV_PIXEL(2);  CONVERT_Y_PIXEL(2);
 180             CONVERT_YUV_PIXEL(2);  CONVERT_Y_PIXEL(2);
 181             CONVERT_YUV_PIXEL(2);  CONVERT_Y_PIXEL(2);
 182             CONVERT_YUV_PIXEL(2);  CONVERT_Y_PIXEL(2);
 183         }
 184
 185         /* Here we do some unaligned reads and duplicate conversions, but
 186          * at least we have all the pixels */
 187         if( i_rewind )
 188         {
 189             p_y -= i_rewind;
 190             p_u -= i_rewind >> 1;
 191             p_v -= i_rewind >> 1;
 192             p_buffer -= i_rewind;
 193
 194             CONVERT_YUV_PIXEL(2);  CONVERT_Y_PIXEL(2);
 195             CONVERT_YUV_PIXEL(2);  CONVERT_Y_PIXEL(2);
 196             CONVERT_YUV_PIXEL(2);  CONVERT_Y_PIXEL(2);
 197             CONVERT_YUV_PIXEL(2);  CONVERT_Y_PIXEL(2);
 198         }
 199         SCALE_WIDTH;
 200         SCALE_HEIGHT( 420, 2 );
 201
 202         p_y += i_source_margin;
 203         if( i_y % 2 )
 204         {
 205             p_u += i_source_margin_c;
 206             p_v += i_source_margin_c;
 207         }
 208     }
 209 }
 210
 211 /*****************************************************************************
 212  * I420_RGB32: color YUV 4:2:0 to RGB 32 bpp
 213  *****************************************************************************
 214  * Horizontal alignment needed:
 215  *  - input: 8 pixels (8 Y bytes, 4 U/V bytes), margins not allowed
 216  *  - output: 1 pixel (2 bytes), margins allowed
 217  * Vertical alignment needed:
 218  *  - input: 2 lines (2 Y lines, 1 U/V line)
 219  *  - output: 1 line
 220  *****************************************************************************/
 221
 222 void I420_RGB32( filter_t *p_filter, picture_t *p_src, picture_t *p_dest )
 223 {
 224     filter_sys_t *p_sys = p_filter->p_sys;
 225
 226     /* We got this one from the old arguments */
 227     uint32_t *p_pic = (uint32_t*)p_dest->p->p_pixels;
 228     uint8_t  *p_y   = p_src->Y_PIXELS;
 229     uint8_t  *p_u   = p_src->U_PIXELS;
 230     uint8_t  *p_v   = p_src->V_PIXELS;
 231
 232     bool  b_hscale;                         /* horizontal scaling type */
 233     unsigned int i_vscale;                          /* vertical scaling type */
 234     unsigned int i_x, i_y;                /* horizontal and vertical indexes */
 235
 236     int         i_right_margin;
 237     int         i_rewind;
 238     int         i_scale_count;                       /* scale modulo counter */
 239     int         i_chroma_width = (p_filter->fmt_in.video.i_x_offset + p_filter->fmt_in.video.i_visible_width) / 2; /* chroma width */
 240     uint32_t *  p_pic_start;       /* beginning of the current line for copy */
 241     int         i_uval, i_vval;                           /* U and V samples */
 242     int         i_red, i_green, i_blue;          /* U and V modified samples */
 243     uint32_t *  p_yuv = p_sys->p_rgb32;
 244     uint32_t *  p_ybase;                     /* Y dependant conversion table */
 245
 246     /* Conversion buffer pointer */
 247     uint32_t *  p_buffer_start;
 248     uint32_t *  p_buffer;
 249
 250     /* Offset array pointer */
 251     int *       p_offset_start = p_sys->p_offset;
 252     int *       p_offset;
 253
 254     const int i_source_margin = p_src->p[0].i_pitch
 255                                  - p_src->p[0].i_visible_pitch
 256                                  - p_filter->fmt_in.video.i_x_offset;
 257     const int i_source_margin_c = p_src->p[1].i_pitch
 258                                  - p_src->p[1].i_visible_pitch
 259                                  - ( p_filter->fmt_in.video.i_x_offset / 2 );
 260
 261     i_right_margin = p_dest->p->i_pitch - p_dest->p->i_visible_pitch;
 262     i_rewind = (-(p_filter->fmt_in.video.i_x_offset + p_filter->fmt_in.video.i_visible_width)) & 7;
 263
 264     /* Rule: when a picture of size (x1,y1) with aspect ratio r1 is rendered
 265      * on a picture of size (x2,y2) with aspect ratio r2, if x1 grows to x1'
 266      * then y1 grows to y1' = x1' * y2/x2 * r2/r1 */
 267     SetOffset( (p_filter->fmt_in.video.i_x_offset + p_filter->fmt_in.video.i_visible_width),
 268                (p_filter->fmt_in.video.i_y_offset + p_filter->fmt_in.video.i_visible_height),
 269                (p_filter->fmt_out.video.i_x_offset + p_filter->fmt_out.video.i_visible_width),
 270                (p_filter->fmt_out.video.i_y_offset + p_filter->fmt_out.video.i_visible_height),
 271                &b_hscale, &i_vscale, p_offset_start );
 272
 273     if(b_hscale &&
 274        AllocateOrGrow(&p_sys->p_buffer, &p_sys->i_buffer_size,
 275                       p_filter->fmt_in.video.i_x_offset +
 276                       p_filter->fmt_in.video.i_visible_width,
 277                       p_sys->i_bytespp))
 278         return;
 279     else p_buffer_start = (uint32_t*)p_sys->p_buffer;
 280
 281     /*
 282      * Perform conversion
 283      */
 284     i_scale_count = ( i_vscale == 1 ) ?
 285                     (p_filter->fmt_out.video.i_y_offset + p_filter->fmt_out.video.i_visible_height) :
 286                     (p_filter->fmt_in.video.i_y_offset + p_filter->fmt_in.video.i_visible_height);
 287     for( i_y = 0; i_y < (p_filter->fmt_in.video.i_y_offset + p_filter->fmt_in.video.i_visible_height); i_y++ )
 288     {
 289         p_pic_start = p_pic;
 290         p_buffer = b_hscale ? p_buffer_start : p_pic;
 291
 292         for ( i_x = (p_filter->fmt_in.video.i_x_offset + p_filter->fmt_in.video.i_visible_width) / 8; i_x--; )
 293         {
 294             CONVERT_YUV_PIXEL(4);  CONVERT_Y_PIXEL(4);
 295             CONVERT_YUV_PIXEL(4);  CONVERT_Y_PIXEL(4);
 296             CONVERT_YUV_PIXEL(4);  CONVERT_Y_PIXEL(4);
 297             CONVERT_YUV_PIXEL(4);  CONVERT_Y_PIXEL(4);
 298         }
 299
 300         /* Here we do some unaligned reads and duplicate conversions, but
 301          * at least we have all the pixels */
 302         if( i_rewind )
 303         {
 304             p_y -= i_rewind;
 305             p_u -= i_rewind >> 1;
 306             p_v -= i_rewind >> 1;
 307             p_buffer -= i_rewind;
 308             CONVERT_YUV_PIXEL(4);  CONVERT_Y_PIXEL(4);
 309             CONVERT_YUV_PIXEL(4);  CONVERT_Y_PIXEL(4);
 310             CONVERT_YUV_PIXEL(4);  CONVERT_Y_PIXEL(4);
 311             CONVERT_YUV_PIXEL(4);  CONVERT_Y_PIXEL(4);
 312         }
 313         SCALE_WIDTH;
 314         SCALE_HEIGHT( 420, 4 );
 315
 316         p_y += i_source_margin;
 317         if( i_y % 2 )
 318         {
 319             p_u += i_source_margin_c;
 320             p_v += i_source_margin_c;
 321         }
 322     }
 323 }