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 #ifdef HAVE_CONFIG_H
  30 # include "config.h"
  31 #endif
  32
  33 #include <vlc/vlc.h>
  34 #include <vlc_plugin.h>
  35 #include <vlc_vout.h>
  36 #include "vlc_filter.h"
  37
  38 /*****************************************************************************
  39  * filter_sys_t : filter descriptor
  40  *****************************************************************************/
  41 struct filter_sys_t
  42 {
  43     es_format_t fmt_in;
  44     es_format_t fmt_out;
  45 };
  46
  47 /****************************************************************************
  48  * Local prototypes
  49  ****************************************************************************/
  50 static int  OpenFilter ( vlc_object_t * );
  51 static void CloseFilter( vlc_object_t * );
  52
  53 static picture_t *Filter( filter_t *, picture_t * );
  54
  55 /*****************************************************************************
  56  * Module descriptor
  57  *****************************************************************************/
  58 vlc_module_begin();
  59     set_description( N_("Video scaling filter") );
  60     set_capability( "video filter2", 10000 );
  61 //    set_category( CAT_VIDEO );
  62 //    set_subcategory( SUBCAT_VIDEO_VFILTER2 );
  63     set_callbacks( OpenFilter, CloseFilter );
  64 vlc_module_end();
  65
  66 /*****************************************************************************
  67  * OpenFilter: probe the filter and return score
  68  *****************************************************************************/
  69 static int OpenFilter( vlc_object_t *p_this )
  70 {
  71     filter_t *p_filter = (filter_t*)p_this;
  72     filter_sys_t *p_sys;
  73
  74     if( ( p_filter->fmt_in.video.i_chroma != VLC_FOURCC('Y','U','V','P') &&
  75           p_filter->fmt_in.video.i_chroma != VLC_FOURCC('Y','U','V','A') &&
  76           p_filter->fmt_in.video.i_chroma != VLC_FOURCC('I','4','2','0') &&
  77           p_filter->fmt_in.video.i_chroma != VLC_FOURCC('Y','V','1','2') &&
  78           p_filter->fmt_in.video.i_chroma != VLC_FOURCC('R','G','B','A') ) ||
  79         p_filter->fmt_in.video.i_chroma != p_filter->fmt_out.video.i_chroma )
  80     {
  81         return VLC_EGENERIC;
  82     }
  83
  84     /* Allocate the memory needed to store the decoder's structure */
  85     if( ( p_filter->p_sys = p_sys =
  86           (filter_sys_t *)malloc(sizeof(filter_sys_t)) ) == NULL )
  87     {
  88         msg_Err( p_filter, "out of memory" );
  89         return VLC_EGENERIC;
  90     }
  91
  92     p_filter->pf_video_filter = Filter;
  93
  94     msg_Dbg( p_filter, "%ix%i -> %ix%i", p_filter->fmt_in.video.i_width,
  95              p_filter->fmt_in.video.i_height, p_filter->fmt_out.video.i_width,
  96              p_filter->fmt_out.video.i_height );
  97
  98     return VLC_SUCCESS;
  99 }
 100
 101 /*****************************************************************************
 102  * CloseFilter: clean up the filter
 103  *****************************************************************************/
 104 static void CloseFilter( vlc_object_t *p_this )
 105 {
 106     filter_t *p_filter = (filter_t*)p_this;
 107     filter_sys_t *p_sys = p_filter->p_sys;
 108
 109     free( p_sys );
 110 }
 111
 112 /****************************************************************************
 113  * Filter: the whole thing
 114  ****************************************************************************/
 115 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
 116 {
 117     picture_t *p_pic_dst;
 118     int i_plane;
 119
 120     if( !p_pic ) return NULL;
 121
 122     if( (p_filter->fmt_in.video.i_height == 0) ||
 123         (p_filter->fmt_in.video.i_width == 0) )
 124         return NULL;
 125
 126     if( (p_filter->fmt_out.video.i_height == 0) ||
 127         (p_filter->fmt_out.video.i_width == 0) )
 128         return NULL;
 129
 130     /* Request output picture */
 131     p_pic_dst = p_filter->pf_vout_buffer_new( p_filter );
 132     if( !p_pic_dst )
 133     {
 134         msg_Warn( p_filter, "can't get output picture" );
 135         if( p_pic->pf_release )
 136             p_pic->pf_release( p_pic );
 137         return NULL;
 138     }
 139
 140     if( p_filter->fmt_in.video.i_chroma != VLC_FOURCC('R','G','B','A') )
 141     {
 142         for( i_plane = 0; i_plane < p_pic_dst->i_planes; i_plane++ )
 143         {
 144             const int i_src_pitch    = p_pic->p[i_plane].i_pitch;
 145             const int i_dst_pitch    = p_pic_dst->p[i_plane].i_pitch;
 146             const int i_src_height   = p_filter->fmt_in.video.i_height;
 147             const int i_src_width    = p_filter->fmt_in.video.i_width;
 148             const int i_dst_height   = p_filter->fmt_out.video.i_height;
 149             const int i_dst_width    = p_filter->fmt_out.video.i_width;
 150             const int i_dst_visible_lines =
 151                                        p_pic_dst->p[i_plane].i_visible_lines;
 152             const int i_dst_visible_pitch =
 153                                        p_pic_dst->p[i_plane].i_visible_pitch;
 154             const int i_dst_hidden_pitch  = i_dst_pitch - i_dst_visible_pitch;
 155 #define SHIFT_SIZE 16
 156             const int i_height_coef  = ( i_src_height << SHIFT_SIZE )
 157                                        / i_dst_height;
 158             const int i_width_coef   = ( i_src_width << SHIFT_SIZE )
 159                                        / i_dst_width;
 160             const int i_src_height_1 = i_src_height - 1;
 161             const int i_src_width_1  = i_src_width - 1;
 162
 163             uint8_t *p_src = p_pic->p[i_plane].p_pixels;
 164             uint8_t *p_dst = p_pic_dst->p[i_plane].p_pixels;
 165             uint8_t *p_dstendline = p_dst + i_dst_visible_pitch;
 166             const uint8_t *p_dstend = p_dst + i_dst_visible_lines*i_dst_pitch;
 167
 168             const int i_shift_height = i_dst_height / i_src_height;
 169             const int i_shift_width = i_dst_width / i_src_width;
 170
 171             int l = 1<<(SHIFT_SIZE-i_shift_height);
 172             for( ; p_dst < p_dstend;
 173                  p_dst += i_dst_hidden_pitch,
 174                  p_dstendline += i_dst_pitch, l += i_height_coef )
 175             {
 176                 int k = 1<<(SHIFT_SIZE-i_shift_width);
 177                 uint8_t *p_srcl = p_src
 178                        + (__MIN( i_src_height_1, l >> SHIFT_SIZE )*i_src_pitch);
 179
 180                 for( ; p_dst < p_dstendline; p_dst++, k += i_width_coef )
 181                 {
 182                     *p_dst = p_srcl[__MIN( i_src_width_1, k >> SHIFT_SIZE )];
 183                 }
 184             }
 185         }
 186     }
 187     else /* RGBA */
 188     {
 189         const int i_src_pitch = p_pic->p->i_pitch;
 190         const int i_dst_pitch = p_pic_dst->p->i_pitch;
 191         const int i_src_height   = p_filter->fmt_in.video.i_height;
 192         const int i_src_width    = p_filter->fmt_in.video.i_width;
 193         const int i_dst_height   = p_filter->fmt_out.video.i_height;
 194         const int i_dst_width    = p_filter->fmt_out.video.i_width;
 195         const int i_dst_visible_lines =
 196                                    p_pic_dst->p->i_visible_lines;
 197         const int i_dst_visible_pitch =
 198                                    p_pic_dst->p->i_visible_pitch;
 199         const int i_dst_hidden_pitch  = i_dst_pitch - i_dst_visible_pitch;
 200         const int i_height_coef  = ( i_src_height << SHIFT_SIZE )
 201                                    / i_dst_height;
 202         const int i_width_coef   = ( i_src_width << SHIFT_SIZE )
 203                                    / i_dst_width;
 204         const int i_src_height_1 = i_src_height - 1;
 205         const int i_src_width_1  = i_src_width - 1;
 206
 207         uint32_t *p_src = (uint32_t*)p_pic->p->p_pixels;
 208         uint32_t *p_dst = (uint32_t*)p_pic_dst->p->p_pixels;
 209         uint32_t *p_dstendline = p_dst + (i_dst_visible_pitch>>2);
 210         const uint32_t *p_dstend = p_dst + i_dst_visible_lines*(i_dst_pitch>>2);
 211
 212         const int i_shift_height = i_dst_height / i_src_height;
 213         const int i_shift_width = i_dst_width / i_src_width;
 214
 215         int l = 1<<(SHIFT_SIZE-i_shift_height);
 216         for( ; p_dst < p_dstend;
 217              p_dst += (i_dst_hidden_pitch>>2),
 218              p_dstendline += (i_dst_pitch>>2),
 219              l += i_height_coef )
 220         {
 221             int k = 1<<(SHIFT_SIZE-i_shift_width);
 222             uint32_t *p_srcl = p_src
 223                     + (__MIN( i_src_height_1, l >> SHIFT_SIZE )*(i_src_pitch>>2));
 224             for( ; p_dst < p_dstendline; p_dst++, k += i_width_coef )
 225             {
 226                 *p_dst = p_srcl[__MIN( i_src_width_1, k >> SHIFT_SIZE )];
 227             }
 228         }
 229     }
 230
 231     p_pic_dst->date = p_pic->date;
 232     p_pic_dst->b_force = p_pic->b_force;
 233     p_pic_dst->i_nb_fields = p_pic->i_nb_fields;
 234     p_pic_dst->b_progressive = p_pic->b_progressive;
 235     p_pic_dst->b_top_field_first = p_pic->b_top_field_first;
 236
 237     p_pic->pf_release( p_pic );
 238     return p_pic_dst;
 239 }