mirror of https://code.videolan.org/videolan/vlc
242 lines
8.1 KiB
C
242 lines
8.1 KiB
C
/*****************************************************************************
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* motion_blur.c : motion blur filter for vlc
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*****************************************************************************
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* Copyright (C) 2000, 2001, 2002, 2003 the VideoLAN team
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* $Id$
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*
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* Authors: Sigmund Augdal Helberg <dnumgis@videolan.org>
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* Antoine Cellerier <dionoea &t videolan d.t 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/vlc.h>
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#include <vlc_sout.h>
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#include <vlc_vout.h>
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#include <vlc_filter.h>
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/*****************************************************************************
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* Local protypes
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*****************************************************************************/
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static int Create ( vlc_object_t * );
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static void Destroy ( vlc_object_t * );
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static picture_t *Filter ( filter_t *, picture_t * );
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static void RenderBlur ( filter_sys_t *, picture_t *, picture_t * );
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static void Copy ( filter_t *, picture_t * );
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static int MotionBlurCallback( vlc_object_t *, char const *,
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vlc_value_t, vlc_value_t, void * );
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/*****************************************************************************
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* Module descriptor
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*****************************************************************************/
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#define FACTOR_TEXT N_("Blur factor (1-127)")
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#define FACTOR_LONGTEXT N_("The degree of blurring from 1 to 127.")
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#define FILTER_PREFIX "blur-"
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vlc_module_begin();
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set_shortname( _("Motion blur") );
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set_description( _("Motion blur filter") );
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set_capability( "video filter2", 0 );
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set_category( CAT_VIDEO );
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set_subcategory( SUBCAT_VIDEO_VFILTER );
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add_integer_with_range( FILTER_PREFIX "factor", 80, 1, 127, NULL,
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FACTOR_TEXT, FACTOR_LONGTEXT, VLC_FALSE );
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add_shortcut( "blur" );
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set_callbacks( Create, Destroy );
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vlc_module_end();
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static const char *ppsz_filter_options[] = {
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"factor", NULL
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};
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/*****************************************************************************
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* filter_sys_t
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*****************************************************************************/
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struct filter_sys_t
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{
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int i_factor;
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uint8_t **pp_planes;
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int i_planes;
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};
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/*****************************************************************************
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* Create
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*****************************************************************************/
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static int Create( 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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/* Allocate structure */
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p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
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if( p_filter->p_sys == NULL )
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{
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msg_Err( p_filter, "out of memory" );
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return VLC_ENOMEM;
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}
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p_filter->pf_video_filter = Filter;
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config_ChainParse( p_filter, FILTER_PREFIX, ppsz_filter_options,
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p_filter->p_cfg );
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p_filter->p_sys->i_factor =
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var_CreateGetIntegerCommand( p_filter, FILTER_PREFIX "factor" );
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var_AddCallback( p_filter, FILTER_PREFIX "factor",
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MotionBlurCallback, p_filter->p_sys );
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p_filter->p_sys->pp_planes = NULL;
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p_filter->p_sys->i_planes = 0;
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return VLC_SUCCESS;
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}
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/*****************************************************************************
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* Destroy
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*****************************************************************************/
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static void Destroy( 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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while( p_filter->p_sys->i_planes-- )
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free( p_filter->p_sys->pp_planes[p_filter->p_sys->i_planes] );
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free( p_filter->p_sys->pp_planes );
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free( p_filter->p_sys );
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}
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#define RELEASE( pic ) \
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if( pic ->pf_release ) \
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pic ->pf_release( pic );
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#define INITPIC( dst, src ) \
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dst ->date = src ->date; \
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dst ->b_force = src ->b_force; \
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dst ->i_nb_fields = src ->i_nb_fields; \
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dst ->b_progressive = src->b_progressive; \
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dst ->b_top_field_first = src ->b_top_field_first;
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/*****************************************************************************
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* Filter
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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_outpic;
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filter_sys_t *p_sys = p_filter->p_sys;
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if( !p_pic ) return NULL;
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p_outpic = p_filter->pf_vout_buffer_new( p_filter );
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if( !p_outpic )
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{
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msg_Warn( p_filter, "can't get output picture" );
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RELEASE( p_pic );
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return NULL;
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}
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INITPIC( p_outpic, p_pic );
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if( !p_sys->pp_planes )
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{
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/* initialise our picture buffer */
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int i_plane;
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p_sys->i_planes = p_pic->i_planes;
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p_sys->pp_planes =
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(uint8_t**)malloc( p_sys->i_planes * sizeof( uint8_t * ) );
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for( i_plane = 0; i_plane < p_pic->i_planes; i_plane++ )
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{
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p_sys->pp_planes[i_plane] = (uint8_t*)malloc(
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p_pic->p[i_plane].i_pitch * p_pic->p[i_plane].i_visible_lines );
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}
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Copy( p_filter, p_pic );
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}
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/* Get a new picture */
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RenderBlur( p_sys, p_pic, p_outpic );
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Copy( p_filter, p_outpic );
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RELEASE( p_pic );
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return p_outpic;
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}
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/*****************************************************************************
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* RenderBlur: renders a blurred picture
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*****************************************************************************/
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static void RenderBlur( filter_sys_t *p_sys, picture_t *p_newpic,
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picture_t *p_outpic )
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{
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int i_plane;
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int i_oldfactor = p_sys->i_factor;
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int i_newfactor = 128 - i_oldfactor;
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for( i_plane = 0; i_plane < p_outpic->i_planes; i_plane++ )
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{
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uint8_t *p_old, *p_new, *p_out, *p_out_end, *p_out_line_end;
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const int i_pitch = p_outpic->p[i_plane].i_pitch;
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const int i_visible_pitch = p_outpic->p[i_plane].i_visible_pitch;
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const int i_visible_lines = p_outpic->p[i_plane].i_visible_lines;
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p_out = p_outpic->p[i_plane].p_pixels;
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p_new = p_newpic->p[i_plane].p_pixels;
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p_old = p_sys->pp_planes[i_plane];
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p_out_end = p_out + i_pitch * i_visible_lines;
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while ( p_out < p_out_end )
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{
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p_out_line_end = p_out + i_visible_pitch;
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while ( p_out < p_out_line_end )
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{
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*p_out++ = (((*p_old++) * i_oldfactor) +
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((*p_new++) * i_newfactor)) >> 7;
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}
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p_old += i_pitch - i_visible_pitch;
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p_new += i_pitch - i_visible_pitch;
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p_out += i_pitch - i_visible_pitch;
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}
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}
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}
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static void Copy( filter_t *p_filter, picture_t *p_pic )
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{
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int i_plane;
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for( i_plane = 0; i_plane < p_pic->i_planes; i_plane++ )
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{
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p_filter->p_libvlc->pf_memcpy(
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p_filter->p_sys->pp_planes[i_plane], p_pic->p[i_plane].p_pixels,
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p_pic->p[i_plane].i_pitch * p_pic->p[i_plane].i_visible_lines );
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}
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}
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static int MotionBlurCallback( vlc_object_t *p_this, char const *psz_var,
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vlc_value_t oldval, vlc_value_t newval,
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void *p_data )
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{
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VLC_UNUSED(p_this); VLC_UNUSED(oldval);
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filter_sys_t *p_sys = (filter_sys_t *)p_data;
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if( !strcmp( psz_var, FILTER_PREFIX "factor" ) )
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p_sys->i_factor = __MIN( 127, __MAX( 1, newval.i_int ) );
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return VLC_SUCCESS;
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}
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