modules/video_chroma/rv32.c

   1 /*****************************************************************************
   2  * rv32.c: conversion plugin to RV32 format.
   3  *****************************************************************************
   4  * Copyright (C) 2005 VLC authors and VideoLAN
   5  * $Id$
   6  *
   7  * Author: Cyril Deguet <asmax@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 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27 #ifdef HAVE_CONFIG_H
  28 # include "config.h"
  29 #endif
  30
  31 #include <vlc_common.h>
  32 #include <vlc_plugin.h>
  33 #include <vlc_filter.h>
  34
  35 /****************************************************************************
  36  * Local prototypes
  37  ****************************************************************************/
  38 static int  OpenFilter ( vlc_object_t * );
  39 static picture_t *Filter( filter_t *, picture_t * );
  40
  41 /*****************************************************************************
  42  * Module descriptor
  43  *****************************************************************************/
  44 vlc_module_begin ()
  45     set_description( N_("RV32 conversion filter") )
  46     set_capability( "video filter2", 1 )
  47     set_callbacks( OpenFilter, NULL )
  48 vlc_module_end ()
  49
  50 /*****************************************************************************
  51  * OpenFilter: probe the filter and return score
  52  *****************************************************************************/
  53 static int OpenFilter( vlc_object_t *p_this )
  54 {
  55     filter_t *p_filter = (filter_t*)p_this;
  56
  57     /* XXX Only support RV24 -> RV32 conversion */
  58     if( p_filter->fmt_in.video.i_chroma != VLC_CODEC_RGB24 ||
  59         (p_filter->fmt_out.video.i_chroma != VLC_CODEC_RGB32 &&
  60         p_filter->fmt_out.video.i_chroma != VLC_CODEC_RGBA) )
  61     {
  62         return VLC_EGENERIC;
  63     }
  64
  65     if( p_filter->fmt_in.video.i_width != p_filter->fmt_out.video.i_width
  66      || p_filter->fmt_in.video.i_height != p_filter->fmt_out.video.i_height )
  67         return -1;
  68
  69     p_filter->pf_video_filter = Filter;
  70
  71     return VLC_SUCCESS;
  72 }
  73
  74 /****************************************************************************
  75  * Filter: the whole thing
  76  ****************************************************************************/
  77 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
  78 {
  79     picture_t *p_pic_dst;
  80     int i_plane, i;
  81     unsigned int j;
  82
  83     /* Request output picture */
  84     p_pic_dst = filter_NewPicture( p_filter );
  85     if( !p_pic_dst )
  86     {
  87         picture_Release( p_pic );
  88         return NULL;
  89     }
  90
  91     /* Convert RV24 to RV32 */
  92     for( i_plane = 0; i_plane < p_pic_dst->i_planes; i_plane++ )
  93     {
  94         uint8_t *p_src = p_pic->p[i_plane].p_pixels;
  95         uint8_t *p_dst = p_pic_dst->p[i_plane].p_pixels;
  96         unsigned int i_width = p_filter->fmt_out.video.i_width;
  97
  98         for( i = 0; i < p_pic_dst->p[i_plane].i_lines; i++ )
  99         {
 100             for( j = 0; j < i_width; j++ )
 101             {
 102                 *(p_dst++) = p_src[2];
 103                 *(p_dst++) = p_src[1];
 104                 *(p_dst++) = p_src[0];
 105                 *(p_dst++) = 0xff;  /* Alpha */
 106                 p_src += 3;
 107             }
 108             p_src += p_pic->p[i_plane].i_pitch - 3 * i_width;
 109             p_dst += p_pic_dst->p[i_plane].i_pitch - 4 * i_width;
 110         }
 111     }
 112
 113     picture_CopyProperties( p_pic_dst, p_pic );
 114     picture_Release( p_pic );
 115
 116     return p_pic_dst;
 117 }
 118