mirror of
https://code.videolan.org/videolan/vlc
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204 lines
8.4 KiB
C
204 lines
8.4 KiB
C
/*****************************************************************************
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* scale.c: video scaling module for YUVP/A, I420 and RGBA pictures
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* Uses the low quality "nearest neighbour" algorithm.
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*****************************************************************************
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* Copyright (C) 2003-2007 the VideoLAN team
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* $Id$
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*
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* Authors: Gildas Bazin <gbazin@videolan.org>
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* Antoine Cellerier <dionoea @t videolan dot org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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*****************************************************************************/
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/*****************************************************************************
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* Preamble
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*****************************************************************************/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <vlc_common.h>
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#include <vlc_plugin.h>
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#include <vlc_filter.h>
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/****************************************************************************
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* Local prototypes
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****************************************************************************/
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static int OpenFilter ( vlc_object_t * );
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static picture_t *Filter( filter_t *, picture_t * );
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/*****************************************************************************
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* Module descriptor
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*****************************************************************************/
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vlc_module_begin ()
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set_description( N_("Video scaling filter") )
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set_capability( "video filter2", 10 )
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set_callbacks( OpenFilter, NULL )
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vlc_module_end ()
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/*****************************************************************************
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* OpenFilter: probe the filter and return score
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*****************************************************************************/
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static int OpenFilter( vlc_object_t *p_this )
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{
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filter_t *p_filter = (filter_t*)p_this;
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if( ( p_filter->fmt_in.video.i_chroma != VLC_CODEC_YUVP &&
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p_filter->fmt_in.video.i_chroma != VLC_CODEC_YUVA &&
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p_filter->fmt_in.video.i_chroma != VLC_CODEC_I420 &&
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p_filter->fmt_in.video.i_chroma != VLC_CODEC_YV12 &&
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p_filter->fmt_in.video.i_chroma != VLC_CODEC_RGB32 &&
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p_filter->fmt_in.video.i_chroma != VLC_CODEC_RGBA ) ||
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p_filter->fmt_in.video.i_chroma != p_filter->fmt_out.video.i_chroma )
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{
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return VLC_EGENERIC;
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}
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video_format_ScaleCropAr( &p_filter->fmt_out.video, &p_filter->fmt_in.video );
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p_filter->pf_video_filter = Filter;
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msg_Dbg( p_filter, "%ix%i -> %ix%i", p_filter->fmt_in.video.i_width,
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p_filter->fmt_in.video.i_height, p_filter->fmt_out.video.i_width,
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p_filter->fmt_out.video.i_height );
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return VLC_SUCCESS;
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}
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/****************************************************************************
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* Filter: the whole thing
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****************************************************************************/
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static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
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{
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picture_t *p_pic_dst;
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int i_plane;
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if( !p_pic ) return NULL;
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if( (p_filter->fmt_in.video.i_height == 0) ||
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(p_filter->fmt_in.video.i_width == 0) )
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return NULL;
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if( (p_filter->fmt_out.video.i_height == 0) ||
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(p_filter->fmt_out.video.i_width == 0) )
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return NULL;
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video_format_ScaleCropAr( &p_filter->fmt_out.video, &p_filter->fmt_in.video );
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/* Request output picture */
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p_pic_dst = filter_NewPicture( p_filter );
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if( !p_pic_dst )
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{
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picture_Release( p_pic );
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return NULL;
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}
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if( p_filter->fmt_in.video.i_chroma != VLC_CODEC_RGBA &&
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p_filter->fmt_in.video.i_chroma != VLC_CODEC_RGB32 )
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{
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for( i_plane = 0; i_plane < p_pic_dst->i_planes; i_plane++ )
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{
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const int i_src_pitch = p_pic->p[i_plane].i_pitch;
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const int i_dst_pitch = p_pic_dst->p[i_plane].i_pitch;
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const int i_src_height = p_filter->fmt_in.video.i_height;
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const int i_src_width = p_filter->fmt_in.video.i_width;
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const int i_dst_height = p_filter->fmt_out.video.i_height;
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const int i_dst_width = p_filter->fmt_out.video.i_width;
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const int i_dst_visible_lines =
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p_pic_dst->p[i_plane].i_visible_lines;
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const int i_dst_visible_pitch =
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p_pic_dst->p[i_plane].i_visible_pitch;
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const int i_dst_hidden_pitch = i_dst_pitch - i_dst_visible_pitch;
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#define SHIFT_SIZE 16
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const int i_height_coef = ( i_src_height << SHIFT_SIZE )
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/ i_dst_height;
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const int i_width_coef = ( i_src_width << SHIFT_SIZE )
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/ i_dst_width;
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const int i_src_height_1 = i_src_height - 1;
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const int i_src_width_1 = i_src_width - 1;
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uint8_t *p_src = p_pic->p[i_plane].p_pixels;
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uint8_t *p_dst = p_pic_dst->p[i_plane].p_pixels;
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uint8_t *p_dstendline = p_dst + i_dst_visible_pitch;
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const uint8_t *p_dstend = p_dst + i_dst_visible_lines*i_dst_pitch;
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const int i_shift_height = i_dst_height / i_src_height;
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const int i_shift_width = i_dst_width / i_src_width;
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int l = 1<<(SHIFT_SIZE-i_shift_height);
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for( ; p_dst < p_dstend;
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p_dst += i_dst_hidden_pitch,
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p_dstendline += i_dst_pitch, l += i_height_coef )
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{
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int k = 1<<(SHIFT_SIZE-i_shift_width);
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uint8_t *p_srcl = p_src
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+ (__MIN( i_src_height_1, l >> SHIFT_SIZE )*i_src_pitch);
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for( ; p_dst < p_dstendline; p_dst++, k += i_width_coef )
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{
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*p_dst = p_srcl[__MIN( i_src_width_1, k >> SHIFT_SIZE )];
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}
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}
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}
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}
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else /* RGBA */
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{
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const int i_src_pitch = p_pic->p->i_pitch;
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const int i_dst_pitch = p_pic_dst->p->i_pitch;
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const int i_src_height = p_filter->fmt_in.video.i_height;
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const int i_src_width = p_filter->fmt_in.video.i_width;
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const int i_dst_height = p_filter->fmt_out.video.i_height;
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const int i_dst_width = p_filter->fmt_out.video.i_width;
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const int i_dst_visible_lines =
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p_pic_dst->p->i_visible_lines;
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const int i_dst_visible_pitch =
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p_pic_dst->p->i_visible_pitch;
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const int i_dst_hidden_pitch = i_dst_pitch - i_dst_visible_pitch;
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const int i_height_coef = ( i_src_height << SHIFT_SIZE )
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/ i_dst_height;
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const int i_width_coef = ( i_src_width << SHIFT_SIZE )
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/ i_dst_width;
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const int i_src_height_1 = i_src_height - 1;
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const int i_src_width_1 = i_src_width - 1;
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uint32_t *p_src = (uint32_t*)p_pic->p->p_pixels;
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uint32_t *p_dst = (uint32_t*)p_pic_dst->p->p_pixels;
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uint32_t *p_dstendline = p_dst + (i_dst_visible_pitch>>2);
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const uint32_t *p_dstend = p_dst + i_dst_visible_lines*(i_dst_pitch>>2);
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const int i_shift_height = i_dst_height / i_src_height;
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const int i_shift_width = i_dst_width / i_src_width;
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int l = 1<<(SHIFT_SIZE-i_shift_height);
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for( ; p_dst < p_dstend;
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p_dst += (i_dst_hidden_pitch>>2),
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p_dstendline += (i_dst_pitch>>2),
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l += i_height_coef )
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{
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int k = 1<<(SHIFT_SIZE-i_shift_width);
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uint32_t *p_srcl = p_src
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+ (__MIN( i_src_height_1, l >> SHIFT_SIZE )*(i_src_pitch>>2));
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for( ; p_dst < p_dstendline; p_dst++, k += i_width_coef )
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{
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*p_dst = p_srcl[__MIN( i_src_width_1, k >> SHIFT_SIZE )];
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}
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}
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}
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picture_CopyProperties( p_pic_dst, p_pic );
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picture_Release( p_pic );
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return p_pic_dst;
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}
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