git.sesse.net Git - vlc/blob - modules/video_filter/scale.c

   1 /*****************************************************************************
   2  * resize.c: video scaling module for YUVP/A, I420 and RGBA pictures
   3  *  Uses the low quality "nearest neighbour" algorithm.
   4  *****************************************************************************
   5  * Copyright (C) 2003-2007 the VideoLAN team
   6  * $Id$
   7  *
   8  * Authors: Gildas Bazin <gbazin@videolan.org>
   9  *          Antoine Cellerier <dionoea @t videolan dot org>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  24  *****************************************************************************/
  25
  26 /*****************************************************************************
  27  * Preamble
  28  *****************************************************************************/
  29 #include <vlc/vlc.h>
  30 #include <vlc_vout.h>
  31 #include "vlc_filter.h"
  32
  33 /*****************************************************************************
  34  * filter_sys_t : filter descriptor
  35  *****************************************************************************/
  36 struct filter_sys_t
  37 {
  38     es_format_t fmt_in;
  39     es_format_t fmt_out;
  40 };
  41
  42 /****************************************************************************
  43  * Local prototypes
  44  ****************************************************************************/
  45 static int  OpenFilter ( vlc_object_t * );
  46 static void CloseFilter( vlc_object_t * );
  47
  48 static picture_t *Filter( filter_t *, picture_t * );
  49
  50 /*****************************************************************************
  51  * Module descriptor
  52  *****************************************************************************/
  53 vlc_module_begin();
  54     set_description( _("Video scaling filter") );
  55     set_capability( "video filter2", 10000 );
  56 //    set_category( CAT_VIDEO );
  57 //    set_subcategory( SUBCAT_VIDEO_VFILTER2 );
  58     set_callbacks( OpenFilter, CloseFilter );
  59 vlc_module_end();
  60
  61 /*****************************************************************************
  62  * OpenFilter: probe the filter and return score
  63  *****************************************************************************/
  64 static int OpenFilter( vlc_object_t *p_this )
  65 {
  66     filter_t *p_filter = (filter_t*)p_this;
  67     filter_sys_t *p_sys;
  68
  69     if( ( p_filter->fmt_in.video.i_chroma != VLC_FOURCC('Y','U','V','P') &&
  70           p_filter->fmt_in.video.i_chroma != VLC_FOURCC('Y','U','V','A') &&
  71           p_filter->fmt_in.video.i_chroma != VLC_FOURCC('I','4','2','0') &&
  72           p_filter->fmt_in.video.i_chroma != VLC_FOURCC('Y','V','1','2') &&
  73           p_filter->fmt_in.video.i_chroma != VLC_FOURCC('R','G','B','A') ) ||
  74         p_filter->fmt_in.video.i_chroma != p_filter->fmt_out.video.i_chroma )
  75     {
  76         return VLC_EGENERIC;
  77     }
  78
  79     /* Allocate the memory needed to store the decoder's structure */
  80     if( ( p_filter->p_sys = p_sys =
  81           (filter_sys_t *)malloc(sizeof(filter_sys_t)) ) == NULL )
  82     {
  83         msg_Err( p_filter, "out of memory" );
  84         return VLC_EGENERIC;
  85     }
  86
  87     p_filter->pf_video_filter = Filter;
  88
  89     msg_Dbg( p_filter, "%ix%i -> %ix%i", p_filter->fmt_in.video.i_width,
  90              p_filter->fmt_in.video.i_height, p_filter->fmt_out.video.i_width,
  91              p_filter->fmt_out.video.i_height );
  92
  93     return VLC_SUCCESS;
  94 }
  95
  96 /*****************************************************************************
  97  * CloseFilter: clean up the filter
  98  *****************************************************************************/
  99 static void CloseFilter( vlc_object_t *p_this )
 100 {
 101     filter_t *p_filter = (filter_t*)p_this;
 102     filter_sys_t *p_sys = p_filter->p_sys;
 103
 104     free( p_sys );
 105 }
 106
 107 /****************************************************************************
 108  * Filter: the whole thing
 109  ****************************************************************************/
 110 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
 111 {
 112     picture_t *p_pic_dst;
 113     int i_plane;
 114
 115     if( !p_pic ) return NULL;
 116
 117     /* Request output picture */
 118     p_pic_dst = p_filter->pf_vout_buffer_new( p_filter );
 119     if( !p_pic_dst )
 120     {
 121         msg_Warn( p_filter, "can't get output picture" );
 122         if( p_pic->pf_release )
 123             p_pic->pf_release( p_pic );
 124         return NULL;
 125     }
 126
 127     if( p_filter->fmt_in.video.i_chroma != VLC_FOURCC('R','G','B','A') )
 128     {
 129         for( i_plane = 0; i_plane < p_pic_dst->i_planes; i_plane++ )
 130         {
 131             const int i_src_pitch    = p_pic->p[i_plane].i_pitch;
 132             const int i_dst_pitch    = p_pic_dst->p[i_plane].i_pitch;
 133             const int i_src_height   = p_filter->fmt_in.video.i_height;
 134             const int i_src_width    = p_filter->fmt_in.video.i_width;
 135             const int i_dst_height   = p_filter->fmt_out.video.i_height;
 136             const int i_dst_width    = p_filter->fmt_out.video.i_width;
 137             const int i_dst_visible_lines =
 138                                        p_pic_dst->p[i_plane].i_visible_lines;
 139             const int i_dst_visible_pitch =
 140                                        p_pic_dst->p[i_plane].i_visible_pitch;
 141             const int i_dst_hidden_pitch  = i_dst_pitch - i_dst_visible_pitch;
 142 #define SHIFT_SIZE 16
 143             const int i_height_coef  = ( i_src_height << SHIFT_SIZE )
 144                                        / i_dst_height;
 145             const int i_width_coef   = ( i_src_width << SHIFT_SIZE )
 146                                        / i_dst_width;
 147             const int i_src_height_1 = i_src_height - 1;
 148             const int i_src_width_1  = i_src_width - 1;
 149
 150             uint8_t *p_src = p_pic->p[i_plane].p_pixels;
 151             uint8_t *p_dst = p_pic_dst->p[i_plane].p_pixels;
 152             uint8_t *p_dstendline = p_dst + i_dst_visible_pitch;
 153             const uint8_t *p_dstend = p_dst + i_dst_visible_lines*i_dst_pitch;
 154
 155             int l = 1<<(SHIFT_SIZE-1);
 156             for( ; p_dst < p_dstend;
 157                  p_dst += i_dst_hidden_pitch,
 158                  p_dstendline += i_dst_pitch, l += i_height_coef )
 159             {
 160                 int k = 1<<(SHIFT_SIZE-1);
 161                 uint8_t *p_srcl = p_src
 162                        + (__MIN( i_src_height_1, l >> SHIFT_SIZE )*i_src_pitch);
 163
 164                 for( ; p_dst < p_dstendline; p_dst++, k += i_width_coef )
 165                 {
 166                     *p_dst = p_srcl[__MIN( i_src_width_1, k >> SHIFT_SIZE )];
 167                 }
 168             }
 169         }
 170     }
 171     else /* RGBA */
 172     {
 173         const int i_src_pitch = p_pic->p->i_pitch;
 174         const int i_dst_pitch = p_pic_dst->p->i_pitch;
 175         const int i_src_height   = p_filter->fmt_in.video.i_height;
 176         const int i_src_width    = p_filter->fmt_in.video.i_width;
 177         const int i_dst_height   = p_filter->fmt_out.video.i_height;
 178         const int i_dst_width    = p_filter->fmt_out.video.i_width;
 179         const int i_dst_visible_lines =
 180                                    p_pic_dst->p->i_visible_lines;
 181         const int i_dst_visible_pitch =
 182                                    p_pic_dst->p->i_visible_pitch;
 183         const int i_dst_hidden_pitch  = i_dst_pitch - i_dst_visible_pitch;
 184         const int i_height_coef  = ( i_src_height << SHIFT_SIZE )
 185                                    / i_dst_height;
 186         const int i_width_coef   = ( i_src_width << SHIFT_SIZE )
 187                                    / i_dst_width;
 188         const int i_src_height_1 = i_src_height - 1;
 189         const int i_src_width_1  = i_src_width - 1;
 190
 191         uint32_t *p_src = (uint32_t*)p_pic->p->p_pixels;
 192         uint32_t *p_dst = (uint32_t*)p_pic_dst->p->p_pixels;
 193         uint32_t *p_dstendline = p_dst + (i_dst_visible_pitch>>2);
 194         const uint32_t *p_dstend = p_dst + i_dst_visible_lines*(i_dst_pitch>>2);
 195
 196         int l = 1<<(SHIFT_SIZE-1);
 197         for( ; p_dst < p_dstend;
 198              p_dst += (i_dst_hidden_pitch>>2),
 199              p_dstendline += (i_dst_pitch>>2),
 200              l += i_height_coef )
 201         {
 202             int k = 1<<(SHIFT_SIZE-1);
 203             uint32_t *p_srcl = p_src
 204                     + (__MIN( i_src_height_1, l >> SHIFT_SIZE )*(i_src_pitch>>2));
 205             for( ; p_dst < p_dstendline; p_dst++, k += i_width_coef )
 206             {
 207                 *p_dst = p_srcl[__MIN( i_src_width_1, k >> SHIFT_SIZE )];
 208             }
 209         }
 210     }
 211
 212     p_pic_dst->date = p_pic->date;
 213     p_pic_dst->b_force = p_pic->b_force;
 214     p_pic_dst->i_nb_fields = p_pic->i_nb_fields;
 215     p_pic_dst->b_progressive = p_pic->b_progressive;
 216     p_pic_dst->b_top_field_first = p_pic->b_top_field_first;
 217
 218     p_pic->pf_release( p_pic );
 219     return p_pic_dst;
 220 }