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/*****************************************************************************
* scale.c: video scaling module for YUVP/A, I420 and RGBA pictures
* Uses the low quality "nearest neighbour" algorithm.
*****************************************************************************
* Copyright (C) 2003-2007 VLC authors and VideoLAN
* $Id$
*
* Authors: Gildas Bazin <gbazin@videolan.org>
* Antoine Cellerier <dionoea @t videolan dot org>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
*****************************************************************************/
/*****************************************************************************
* Preamble
*****************************************************************************/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <vlc_common.h>
#include <vlc_plugin.h>
#include <vlc_filter.h>
#include <vlc_picture.h>
/****************************************************************************
* Local prototypes
****************************************************************************/
static int OpenFilter ( vlc_object_t * );
static picture_t *Filter( filter_t *, picture_t * );
/*****************************************************************************
* Module descriptor
*****************************************************************************/
vlc_module_begin ()
set_description( N_("Video scaling filter") )
set_capability( "video converter", 10 )
set_callbacks( OpenFilter, NULL )
vlc_module_end ()
/*****************************************************************************
* OpenFilter: probe the filter and return score
*****************************************************************************/
static int OpenFilter( vlc_object_t *p_this )
{
filter_t *p_filter = (filter_t*)p_this;
if( ( p_filter->fmt_in.video.i_chroma != VLC_CODEC_YUVP &&
p_filter->fmt_in.video.i_chroma != VLC_CODEC_YUVA &&
p_filter->fmt_in.video.i_chroma != VLC_CODEC_I420 &&
p_filter->fmt_in.video.i_chroma != VLC_CODEC_YV12 &&
p_filter->fmt_in.video.i_chroma != VLC_CODEC_RGB32 &&
p_filter->fmt_in.video.i_chroma != VLC_CODEC_RGBA &&
p_filter->fmt_in.video.i_chroma != VLC_CODEC_ARGB ) ||
p_filter->fmt_in.video.i_chroma != p_filter->fmt_out.video.i_chroma )
{
return VLC_EGENERIC;
}
if( p_filter->fmt_in.video.orientation != p_filter->fmt_out.video.orientation )
return VLC_EGENERIC;
#warning Converter cannot (really) change output format.
video_format_ScaleCropAr( &p_filter->fmt_out.video, &p_filter->fmt_in.video );
p_filter->pf_video_filter = Filter;
msg_Dbg( p_filter, "%ix%i -> %ix%i", p_filter->fmt_in.video.i_width,
p_filter->fmt_in.video.i_height, p_filter->fmt_out.video.i_width,
p_filter->fmt_out.video.i_height );
return VLC_SUCCESS;
}
/****************************************************************************
* Filter: the whole thing
****************************************************************************/
static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
{
picture_t *p_pic_dst;
if( !p_pic ) return NULL;
#warning Converter cannot (really) change output format.
video_format_ScaleCropAr( &p_filter->fmt_out.video, &p_filter->fmt_in.video );
/* Request output picture */
p_pic_dst = filter_NewPicture( p_filter );
if( !p_pic_dst )
{
picture_Release( p_pic );
return NULL;
}
if( p_filter->fmt_in.video.i_chroma != VLC_CODEC_RGBA &&
p_filter->fmt_in.video.i_chroma != VLC_CODEC_ARGB &&
p_filter->fmt_in.video.i_chroma != VLC_CODEC_RGB32 )
{
for( int i_plane = 0; i_plane < p_pic_dst->i_planes; i_plane++ )
{
const int i_src_pitch = p_pic->p[i_plane].i_pitch;
const int i_dst_pitch = p_pic_dst->p[i_plane].i_pitch;
const int i_src_height = p_filter->fmt_in.video.i_height;
const int i_src_width = p_filter->fmt_in.video.i_width;
const int i_dst_height = p_filter->fmt_out.video.i_height;
const int i_dst_width = p_filter->fmt_out.video.i_width;
const int i_dst_visible_lines =
p_pic_dst->p[i_plane].i_visible_lines;
const int i_dst_visible_pitch =
p_pic_dst->p[i_plane].i_visible_pitch;
const int i_dst_hidden_pitch = i_dst_pitch - i_dst_visible_pitch;
#define SHIFT_SIZE 16
const int i_height_coef = ( i_src_height << SHIFT_SIZE )
/ i_dst_height;
const int i_width_coef = ( i_src_width << SHIFT_SIZE )
/ i_dst_width;
const int i_src_height_1 = i_src_height - 1;
const int i_src_width_1 = i_src_width - 1;
uint8_t *p_src = p_pic->p[i_plane].p_pixels;
uint8_t *p_dst = p_pic_dst->p[i_plane].p_pixels;
uint8_t *p_dstendline = p_dst + i_dst_visible_pitch;
const uint8_t *p_dstend = p_dst + i_dst_visible_lines*i_dst_pitch;
const int i_shift_height = i_dst_height / i_src_height;
const int i_shift_width = i_dst_width / i_src_width;
int l = 1<<(SHIFT_SIZE-i_shift_height);
for( ; p_dst < p_dstend;
p_dst += i_dst_hidden_pitch,
p_dstendline += i_dst_pitch, l += i_height_coef )
{
int k = 1<<(SHIFT_SIZE-i_shift_width);
uint8_t *p_srcl = p_src
+ (__MIN( i_src_height_1, l >> SHIFT_SIZE )*i_src_pitch);
for( ; p_dst < p_dstendline; p_dst++, k += i_width_coef )
{
*p_dst = p_srcl[__MIN( i_src_width_1, k >> SHIFT_SIZE )];
}
}
}
}
else /* RGBA */
{
const int i_src_pitch = p_pic->p->i_pitch;
const int i_dst_pitch = p_pic_dst->p->i_pitch;
const int i_src_height = p_filter->fmt_in.video.i_height;
const int i_src_width = p_filter->fmt_in.video.i_width;
const int i_dst_height = p_filter->fmt_out.video.i_height;
const int i_dst_width = p_filter->fmt_out.video.i_width;
const int i_dst_visible_lines =
p_pic_dst->p->i_visible_lines;
const int i_dst_visible_pitch =
p_pic_dst->p->i_visible_pitch;
const int i_dst_hidden_pitch = i_dst_pitch - i_dst_visible_pitch;
const int i_height_coef = ( i_src_height << SHIFT_SIZE )
/ i_dst_height;
const int i_width_coef = ( i_src_width << SHIFT_SIZE )
/ i_dst_width;
const int i_src_height_1 = i_src_height - 1;
const int i_src_width_1 = i_src_width - 1;
uint32_t *p_src = (uint32_t*)p_pic->p->p_pixels;
uint32_t *p_dst = (uint32_t*)p_pic_dst->p->p_pixels;
uint32_t *p_dstendline = p_dst + (i_dst_visible_pitch>>2);
const uint32_t *p_dstend = p_dst + i_dst_visible_lines*(i_dst_pitch>>2);
const int i_shift_height = i_dst_height / i_src_height;
const int i_shift_width = i_dst_width / i_src_width;
int l = 1<<(SHIFT_SIZE-i_shift_height);
for( ; p_dst < p_dstend;
p_dst += (i_dst_hidden_pitch>>2),
p_dstendline += (i_dst_pitch>>2),
l += i_height_coef )
{
int k = 1<<(SHIFT_SIZE-i_shift_width);
uint32_t *p_srcl = p_src
+ (__MIN( i_src_height_1, l >> SHIFT_SIZE )*(i_src_pitch>>2));
for( ; p_dst < p_dstendline; p_dst++, k += i_width_coef )
{
*p_dst = p_srcl[__MIN( i_src_width_1, k >> SHIFT_SIZE )];
}
}
}
picture_CopyProperties( p_pic_dst, p_pic );
picture_Release( p_pic );
return p_pic_dst;
}
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