modules/video_chroma/rv32.c

   1 /*****************************************************************************
   2  * rv32.c: conversion plugin to RV32 format.
   3  *****************************************************************************
   4  * Copyright (C) 2005 VLC authors and VideoLAN
   5  *
   6  * Author: Cyril Deguet <asmax@videolan.org>
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU Lesser General Public License as published by
  10  * the Free Software Foundation; either version 2.1 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  16  * GNU Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public License
  19  * along with this program; if not, write to the Free Software Foundation,
  20  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  21  *****************************************************************************/
  22
  23 /*****************************************************************************
  24  * Preamble
  25  *****************************************************************************/
  26 #ifdef HAVE_CONFIG_H
  27 # include "config.h"
  28 #endif
  29
  30 #include <vlc_common.h>
  31 #include <vlc_plugin.h>
  32 #include <vlc_filter.h>
  33 #include <vlc_picture.h>
  34
  35 /****************************************************************************
  36  * Local prototypes
  37  ****************************************************************************/
  38 static int  OpenFilter ( filter_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_callback_video_converter( OpenFilter, 1 )
  47 vlc_module_end ()
  48
  49 static const struct vlc_filter_operations filter_ops = {
  50     .filter_video = Filter,
  51 };
  52
  53 /*****************************************************************************
  54  * OpenFilter: probe the filter and return score
  55  *****************************************************************************/
  56 static int OpenFilter( filter_t *p_filter )
  57 {
  58     /* XXX Only support RV24 -> RV32 conversion */
  59     if( p_filter->fmt_in.video.i_chroma != VLC_CODEC_RGB24 ||
  60         (p_filter->fmt_out.video.i_chroma != VLC_CODEC_RGB32 &&
  61         p_filter->fmt_out.video.i_chroma != VLC_CODEC_RGBA) )
  62     {
  63         return VLC_EGENERIC;
  64     }
  65
  66     if( p_filter->fmt_in.video.i_width != p_filter->fmt_out.video.i_width
  67      || p_filter->fmt_in.video.i_height != p_filter->fmt_out.video.i_height
  68      || p_filter->fmt_in.video.orientation != p_filter->fmt_out.video.orientation)
  69         return -1;
  70
  71     p_filter->ops = &filter_ops;
  72
  73     return VLC_SUCCESS;
  74 }
  75
  76 /****************************************************************************
  77  * Filter: the whole thing
  78  ****************************************************************************/
  79 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
  80 {
  81     picture_t *p_pic_dst;
  82     int i_plane, i;
  83     unsigned int j;
  84
  85     /* Request output picture */
  86     p_pic_dst = filter_NewPicture( p_filter );
  87     if( !p_pic_dst )
  88     {
  89         picture_Release( p_pic );
  90         return NULL;
  91     }
  92
  93     /* Convert RV24 to RV32 */
  94     for( i_plane = 0; i_plane < p_pic_dst->i_planes; i_plane++ )
  95     {
  96         uint8_t *p_src = p_pic->p[i_plane].p_pixels;
  97         uint8_t *p_dst = p_pic_dst->p[i_plane].p_pixels;
  98         unsigned int i_width = p_filter->fmt_out.video.i_width;
  99
 100         for( i = 0; i < p_pic_dst->p[i_plane].i_lines; i++ )
 101         {
 102             for( j = 0; j < i_width; j++ )
 103             {
 104                 *(p_dst++) = p_src[2];
 105                 *(p_dst++) = p_src[1];
 106                 *(p_dst++) = p_src[0];
 107                 *(p_dst++) = 0xff;  /* Alpha */
 108                 p_src += 3;
 109             }
 110             p_src += p_pic->p[i_plane].i_pitch - 3 * i_width;
 111             p_dst += p_pic_dst->p[i_plane].i_pitch - 4 * i_width;
 112         }
 113     }
 114
 115     picture_CopyProperties( p_pic_dst, p_pic );
 116     picture_Release( p_pic );
 117
 118     return p_pic_dst;
 119 }
 120