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  * $Id$
   6  *
   7  * Authors: Samuel Hocevar <sam@zoy.org>
   8  *          Damien Fouilleul <damienf@videolan.org>
   9  *
  10  * This program is free software; you can redistribute it and/or modify it
  11  * under the terms of the GNU Lesser General Public License as published by
  12  * the Free Software Foundation; either version 2.1 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  18  * GNU Lesser General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU Lesser General Public License
  21  * along with this program; if not, write to the Free Software Foundation,
  22  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  23  *****************************************************************************/
  24
  25 #ifdef HAVE_CONFIG_H
  26 # include "config.h"
  27 #endif
  28
  29 #include <vlc_common.h>
  30 #include <vlc_filter.h>
  31 #include <vlc_picture.h>
  32 #include <vlc_cpu.h>
  33
  34 #include "i420_rgb.h"
  35 #include "i420_rgb_c.h"
  36
  37 /*****************************************************************************
  38  * SetOffset: build offset array for conversion functions
  39  *****************************************************************************
  40  * This function will build an offset array used in later conversion functions.
  41  * It will also set horizontal and vertical scaling indicators.
  42  *****************************************************************************/
  43 static void SetOffset( int i_width, int i_height, int i_pic_width,
  44                        int i_pic_height, bool *pb_hscale,
  45                        unsigned int *pi_vscale, int *p_offset )
  46 {
  47     /*
  48      * Prepare horizontal offset array
  49      */
  50     if( i_pic_width - i_width == 0 )
  51     {   /* No horizontal scaling: YUV conversion is done directly to picture */
  52         *pb_hscale = 0;
  53     }
  54     else if( i_pic_width - i_width > 0 )
  55     {   /* Prepare scaling array for horizontal extension */
  56         int i_scale_count = i_pic_width;
  57
  58         *pb_hscale = 1;
  59         for( int i_x = i_width; i_x--; )
  60         {
  61             while( (i_scale_count -= i_width) > 0 )
  62             {
  63                 *p_offset++ = 0;
  64             }
  65             *p_offset++ = 1;
  66             i_scale_count += i_pic_width;
  67         }
  68     }
  69     else /* if( i_pic_width - i_width < 0 ) */
  70     {   /* Prepare scaling array for horizontal reduction */
  71         int i_scale_count = i_pic_width;
  72
  73         *pb_hscale = 1;
  74         for( int i_x = i_pic_width; i_x--; )
  75         {
  76             *p_offset = 1;
  77             while( (i_scale_count -= i_pic_width) > 0 )
  78             {
  79                 *p_offset += 1;
  80             }
  81             p_offset++;
  82             i_scale_count += i_width;
  83         }
  84     }
  85
  86     /*
  87      * Set vertical scaling indicator
  88      */
  89     if( i_pic_height - i_height == 0 )
  90         *pi_vscale = 0;
  91     else if( i_pic_height - i_height > 0 )
  92         *pi_vscale = 1;
  93     else /* if( i_pic_height - i_height < 0 ) */
  94         *pi_vscale = -1;
  95 }
  96
  97 /*****************************************************************************
  98  * I420_RGB16: color YUV 4:2:0 to RGB 16 bpp
  99  *****************************************************************************
 100  * Horizontal alignment needed:
 101  *  - input: 8 pixels (8 Y bytes, 4 U/V bytes), margins not allowed
 102  *  - output: 1 pixel (2 bytes), margins allowed
 103  * Vertical alignment needed:
 104  *  - input: 2 lines (2 Y lines, 1 U/V line)
 105  *  - output: 1 line
 106  *****************************************************************************/
 107
 108 void I420_RGB16( filter_t *p_filter, picture_t *p_src, picture_t *p_dest )
 109 {
 110     filter_sys_t *p_sys = p_filter->p_sys;
 111
 112     /* We got this one from the old arguments */
 113     uint16_t *p_pic = (uint16_t*)p_dest->p->p_pixels;
 114     uint8_t  *p_y   = p_src->Y_PIXELS;
 115     uint8_t  *p_u   = p_src->U_PIXELS;
 116     uint8_t  *p_v   = p_src->V_PIXELS;
 117
 118     bool  b_hscale;                         /* horizontal scaling type */
 119     unsigned int i_vscale;                          /* vertical scaling type */
 120     unsigned int i_x, i_y;                /* horizontal and vertical indexes */
 121
 122     int         i_right_margin;
 123     int         i_rewind;
 124     int         i_scale_count;                       /* scale modulo counter */
 125     int         i_chroma_width = (p_filter->fmt_in.video.i_x_offset + p_filter->fmt_in.video.i_visible_width) / 2; /* chroma width */
 126     uint16_t *  p_pic_start;       /* beginning of the current line for copy */
 127     int         i_uval, i_vval;                           /* U and V samples */
 128     int         i_red, i_green, i_blue;          /* U and V modified samples */
 129     uint16_t *  p_yuv = p_sys->p_rgb16;
 130     uint16_t *  p_ybase;                     /* Y dependant conversion table */
 131
 132     /* Conversion buffer pointer */
 133     uint16_t *  p_buffer_start;
 134     uint16_t *  p_buffer;
 135
 136     /* Offset array pointer */
 137     int *       p_offset_start = p_sys->p_offset;
 138     int *       p_offset;
 139
 140     const int i_source_margin = p_src->p[0].i_pitch
 141                                  - p_src->p[0].i_visible_pitch
 142                                  - p_filter->fmt_in.video.i_x_offset;
 143     const int i_source_margin_c = p_src->p[1].i_pitch
 144                                  - p_src->p[1].i_visible_pitch
 145                                  - ( p_filter->fmt_in.video.i_x_offset / 2 );
 146
 147     i_right_margin = p_dest->p->i_pitch - p_dest->p->i_visible_pitch;
 148     i_rewind = (-(p_filter->fmt_in.video.i_x_offset + p_filter->fmt_in.video.i_visible_width)) & 7;
 149
 150     /* Rule: when a picture of size (x1,y1) with aspect ratio r1 is rendered
 151      * on a picture of size (x2,y2) with aspect ratio r2, if x1 grows to x1'
 152      * then y1 grows to y1' = x1' * y2/x2 * r2/r1 */
 153     SetOffset( (p_filter->fmt_in.video.i_x_offset + p_filter->fmt_in.video.i_visible_width),
 154                (p_filter->fmt_in.video.i_y_offset + p_filter->fmt_in.video.i_visible_height),
 155                (p_filter->fmt_out.video.i_x_offset + p_filter->fmt_out.video.i_visible_width),
 156                (p_filter->fmt_out.video.i_y_offset + p_filter->fmt_out.video.i_visible_height),
 157                &b_hscale, &i_vscale, p_offset_start );
 158
 159     if(b_hscale &&
 160        AllocateOrGrow(&p_sys->p_buffer, &p_sys->i_buffer_size,
 161                       p_filter->fmt_in.video.i_x_offset +
 162                       p_filter->fmt_in.video.i_visible_width,
 163                       p_sys->i_bytespp))
 164         return;
 165     else p_buffer_start = (uint16_t*)p_sys->p_buffer;
 166
 167     /*
 168      * Perform conversion
 169      */
 170     i_scale_count = ( i_vscale == 1 ) ?
 171                     (p_filter->fmt_out.video.i_y_offset + p_filter->fmt_out.video.i_visible_height) :
 172                     (p_filter->fmt_in.video.i_y_offset + p_filter->fmt_in.video.i_visible_height);
 173     for( i_y = 0; i_y < (p_filter->fmt_in.video.i_y_offset + p_filter->fmt_in.video.i_visible_height); i_y++ )
 174     {
 175         p_pic_start = p_pic;
 176         p_buffer = b_hscale ? p_buffer_start : p_pic;
 177
 178         for ( i_x = (p_filter->fmt_in.video.i_x_offset + p_filter->fmt_in.video.i_visible_width) / 8; i_x--; )
 179         {
 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             CONVERT_YUV_PIXEL(2);  CONVERT_Y_PIXEL(2);
 184         }
 185
 186         /* Here we do some unaligned reads and duplicate conversions, but
 187          * at least we have all the pixels */
 188         if( i_rewind )
 189         {
 190             p_y -= i_rewind;
 191             p_u -= i_rewind >> 1;
 192             p_v -= i_rewind >> 1;
 193             p_buffer -= i_rewind;
 194
 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             CONVERT_YUV_PIXEL(2);  CONVERT_Y_PIXEL(2);
 199         }
 200         SCALE_WIDTH;
 201         SCALE_HEIGHT( 420, 2 );
 202
 203         p_y += i_source_margin;
 204         if( i_y % 2 )
 205         {
 206             p_u += i_source_margin_c;
 207             p_v += i_source_margin_c;
 208         }
 209     }
 210 }
 211
 212 /*****************************************************************************
 213  * I420_RGB32: color YUV 4:2:0 to RGB 32 bpp
 214  *****************************************************************************
 215  * Horizontal alignment needed:
 216  *  - input: 8 pixels (8 Y bytes, 4 U/V bytes), margins not allowed
 217  *  - output: 1 pixel (2 bytes), margins allowed
 218  * Vertical alignment needed:
 219  *  - input: 2 lines (2 Y lines, 1 U/V line)
 220  *  - output: 1 line
 221  *****************************************************************************/
 222
 223 void I420_RGB32( filter_t *p_filter, picture_t *p_src, picture_t *p_dest )
 224 {
 225     filter_sys_t *p_sys = p_filter->p_sys;
 226
 227     /* We got this one from the old arguments */
 228     uint32_t *p_pic = (uint32_t*)p_dest->p->p_pixels;
 229     uint8_t  *p_y   = p_src->Y_PIXELS;
 230     uint8_t  *p_u   = p_src->U_PIXELS;
 231     uint8_t  *p_v   = p_src->V_PIXELS;
 232
 233     bool  b_hscale;                         /* horizontal scaling type */
 234     unsigned int i_vscale;                          /* vertical scaling type */
 235     unsigned int i_x, i_y;                /* horizontal and vertical indexes */
 236
 237     int         i_right_margin;
 238     int         i_rewind;
 239     int         i_scale_count;                       /* scale modulo counter */
 240     int         i_chroma_width = (p_filter->fmt_in.video.i_x_offset + p_filter->fmt_in.video.i_visible_width) / 2; /* chroma width */
 241     uint32_t *  p_pic_start;       /* beginning of the current line for copy */
 242     int         i_uval, i_vval;                           /* U and V samples */
 243     int         i_red, i_green, i_blue;          /* U and V modified samples */
 244     uint32_t *  p_yuv = p_sys->p_rgb32;
 245     uint32_t *  p_ybase;                     /* Y dependant conversion table */
 246
 247     /* Conversion buffer pointer */
 248     uint32_t *  p_buffer_start;
 249     uint32_t *  p_buffer;
 250
 251     /* Offset array pointer */
 252     int *       p_offset_start = p_sys->p_offset;
 253     int *       p_offset;
 254
 255     const int i_source_margin = p_src->p[0].i_pitch
 256                                  - p_src->p[0].i_visible_pitch
 257                                  - p_filter->fmt_in.video.i_x_offset;
 258     const int i_source_margin_c = p_src->p[1].i_pitch
 259                                  - p_src->p[1].i_visible_pitch
 260                                  - ( p_filter->fmt_in.video.i_x_offset / 2 );
 261
 262     i_right_margin = p_dest->p->i_pitch - p_dest->p->i_visible_pitch;
 263     i_rewind = (-(p_filter->fmt_in.video.i_x_offset + p_filter->fmt_in.video.i_visible_width)) & 7;
 264
 265     /* Rule: when a picture of size (x1,y1) with aspect ratio r1 is rendered
 266      * on a picture of size (x2,y2) with aspect ratio r2, if x1 grows to x1'
 267      * then y1 grows to y1' = x1' * y2/x2 * r2/r1 */
 268     SetOffset( (p_filter->fmt_in.video.i_x_offset + p_filter->fmt_in.video.i_visible_width),
 269                (p_filter->fmt_in.video.i_y_offset + p_filter->fmt_in.video.i_visible_height),
 270                (p_filter->fmt_out.video.i_x_offset + p_filter->fmt_out.video.i_visible_width),
 271                (p_filter->fmt_out.video.i_y_offset + p_filter->fmt_out.video.i_visible_height),
 272                &b_hscale, &i_vscale, p_offset_start );
 273
 274     if(b_hscale &&
 275        AllocateOrGrow(&p_sys->p_buffer, &p_sys->i_buffer_size,
 276                       p_filter->fmt_in.video.i_x_offset +
 277                       p_filter->fmt_in.video.i_visible_width,
 278                       p_sys->i_bytespp))
 279         return;
 280     else p_buffer_start = (uint32_t*)p_sys->p_buffer;
 281
 282     /*
 283      * Perform conversion
 284      */
 285     i_scale_count = ( i_vscale == 1 ) ?
 286                     (p_filter->fmt_out.video.i_y_offset + p_filter->fmt_out.video.i_visible_height) :
 287                     (p_filter->fmt_in.video.i_y_offset + p_filter->fmt_in.video.i_visible_height);
 288     for( i_y = 0; i_y < (p_filter->fmt_in.video.i_y_offset + p_filter->fmt_in.video.i_visible_height); i_y++ )
 289     {
 290         p_pic_start = p_pic;
 291         p_buffer = b_hscale ? p_buffer_start : p_pic;
 292
 293         for ( i_x = (p_filter->fmt_in.video.i_x_offset + p_filter->fmt_in.video.i_visible_width) / 8; i_x--; )
 294         {
 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             CONVERT_YUV_PIXEL(4);  CONVERT_Y_PIXEL(4);
 299         }
 300
 301         /* Here we do some unaligned reads and duplicate conversions, but
 302          * at least we have all the pixels */
 303         if( i_rewind )
 304         {
 305             p_y -= i_rewind;
 306             p_u -= i_rewind >> 1;
 307             p_v -= i_rewind >> 1;
 308             p_buffer -= i_rewind;
 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             CONVERT_YUV_PIXEL(4);  CONVERT_Y_PIXEL(4);
 313         }
 314         SCALE_WIDTH;
 315         SCALE_HEIGHT( 420, 4 );
 316
 317         p_y += i_source_margin;
 318         if( i_y % 2 )
 319         {
 320             p_u += i_source_margin_c;
 321             p_v += i_source_margin_c;
 322         }
 323     }
 324 }