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grain.c
资源名称：vlc-1.0.5.zip [点击查看]
上传用户：kjfoods
上传日期：2020-07-06
资源大小：29949k
文件大小：7k
源码类别：
midi
开发平台：
Unix_Linux
- /*****************************************************************************
- * noise.c : "add grain to image" video filter
- *****************************************************************************
- * Copyright (C) 2000-2007 the VideoLAN team
- * $Id: 28f54eb813ffb07c3c3a5088f0ed5f671e99b48a $
- *
- * Authors: Antoine Cellerier <dionoea -at- videolan -dot- org>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 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 General Public License for more details.
- *
- * You should have received a copy of the GNU 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_vout.h>
- #include "vlc_filter.h"
- #include "filter_picture.h"
- /*****************************************************************************
- * Local prototypes
- *****************************************************************************/
- static int Create ( vlc_object_t * );
- static void Destroy ( vlc_object_t * );
- static picture_t *Filter( filter_t *, picture_t * );
- #define FILTER_PREFIX "grain-"
- /*****************************************************************************
- * Module descriptor
- *****************************************************************************/
- vlc_module_begin ()
- set_description( N_("Grain video filter") )
- set_shortname( N_( "Grain" ))
- set_capability( "video filter2", 0 )
- set_category( CAT_VIDEO )
- set_subcategory( SUBCAT_VIDEO_VFILTER )
- set_callbacks( Create, Destroy )
- vlc_module_end ()
- struct filter_sys_t
- {
- int *p_noise;
- };
- static int Create( vlc_object_t *p_this )
- {
- filter_t *p_filter = (filter_t *)p_this;
- switch( p_filter->fmt_in.video.i_chroma )
- {
- CASE_PLANAR_YUV
- break;
- default:
- msg_Err( p_filter, "Unsupported input chroma (%4s)",
- (char*)&(p_filter->fmt_in.video.i_chroma) );
- return VLC_EGENERIC;
- }
- /* Allocate structure */
- p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
- if( p_filter->p_sys == NULL )
- return VLC_ENOMEM;
- p_filter->pf_video_filter = Filter;
- p_filter->p_sys->p_noise = NULL;
- return VLC_SUCCESS;
- }
- static void Destroy( vlc_object_t *p_this )
- {
- filter_t *p_filter = (filter_t *)p_this;
- free( p_filter->p_sys->p_noise );
- free( p_filter->p_sys );
- }
- static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
- {
- picture_t *p_outpic;
- filter_sys_t *p_sys = p_filter->p_sys;
- int i_index;
- if( !p_pic ) return NULL;
- p_outpic = filter_NewPicture( p_filter );
- if( !p_outpic )
- {
- picture_Release( p_pic );
- return NULL;
- }
- {
- uint8_t *p_in = p_pic->p[Y_PLANE].p_pixels;
- uint8_t *p_out = p_outpic->p[Y_PLANE].p_pixels;
- const int i_num_lines = p_pic->p[Y_PLANE].i_visible_lines;
- const int i_num_cols = p_pic->p[Y_PLANE].i_visible_pitch;
- const int i_pitch = p_pic->p[Y_PLANE].i_pitch;
- int i_line, i_col;
- int *p_noise = p_sys->p_noise;
- if( !p_noise )
- {
- p_noise = p_sys->p_noise =
- (int*)malloc(i_pitch*i_num_lines*sizeof(int));
- }
- for( i_line = 0; i_line < i_num_lines; i_line++ )
- {
- for( i_col = 0; i_col < i_num_cols; i_col++ )
- {
- p_noise[i_line*i_pitch+i_col] = ((rand()&0x1f)-0x0f);
- }
- }
- for( i_line = 2/*0*/ ; i_line < i_num_lines-2/**/; i_line++ )
- {
- for( i_col = 2/*0*/; i_col < i_num_cols/2; i_col++ )
- {
- p_out[i_line*i_pitch+i_col] = clip_uint8_vlc(
- p_in[i_line*i_pitch+i_col]
- #if 0
- + p_noise[i_line*i_pitch+i_col] );
- #else
- /* 2 rows up */
- + (( ( p_noise[(i_line-2)*i_pitch+i_col-2]<<1 )
- + ( p_noise[(i_line-2)*i_pitch+i_col-1]<<2 )
- + ( p_noise[(i_line-2)*i_pitch+i_col]<<2 )
- + ( p_noise[(i_line-2)*i_pitch+i_col+1]<<2 )
- + ( p_noise[(i_line-2)*i_pitch+i_col+2]<<1 )
- /* 1 row up */
- + ( p_noise[(i_line-1)*i_pitch+i_col-2]<<2 )
- + ( p_noise[(i_line-1)*i_pitch+i_col-1]<<3 )
- + ( p_noise[(i_line-1)*i_pitch+i_col]*12 )
- + ( p_noise[(i_line-1)*i_pitch+i_col+1]<<3 )
- + ( p_noise[(i_line-1)*i_pitch+i_col+2]<<2 )
- /* */
- + ( p_noise[i_line*i_pitch+i_col-2]<<2 )
- + ( p_noise[i_line*i_pitch+i_col-1]*12 )
- + ( p_noise[i_line*i_pitch+i_col]<<4 )
- + ( p_noise[i_line*i_pitch+i_col+1]*12 )
- + ( p_noise[i_line*i_pitch+i_col+2]<<2 )
- /* 1 row down */
- + ( p_noise[(i_line+1)*i_pitch+i_col-2]<<2 )
- + ( p_noise[(i_line+1)*i_pitch+i_col-1]<<3 )
- + ( p_noise[(i_line+1)*i_pitch+i_col]*12 )
- + ( p_noise[(i_line+1)*i_pitch+i_col+1]<<3 )
- + ( p_noise[(i_line+1)*i_pitch+i_col+2]<<2 )
- /* 2 rows down */
- + ( p_noise[(i_line+2)*i_pitch+i_col-2]<<1 )
- + ( p_noise[(i_line+2)*i_pitch+i_col-1]<<2 )
- + ( p_noise[(i_line+2)*i_pitch+i_col]<<2 )
- + ( p_noise[(i_line+2)*i_pitch+i_col+1]<<2 )
- + ( p_noise[(i_line+2)*i_pitch+i_col+2]<<1 )
- )>>7/*/152*/));
- #endif
- }
- for( ; i_col < i_num_cols; i_col++ )
- p_out[i_line*i_pitch+i_col] = p_in[i_line*i_pitch+i_col];
- }
- }
- for( i_index = 1; i_index < p_pic->i_planes; i_index++ )
- {
- uint8_t *p_in = p_pic->p[i_index].p_pixels;
- uint8_t *p_out = p_outpic->p[i_index].p_pixels;
- const int i_lines = p_pic->p[i_index].i_lines;
- const int i_pitch = p_pic->p[i_index].i_pitch;
- vlc_memcpy( p_out, p_in, i_lines * i_pitch );
- }
- return CopyInfoAndRelease( p_outpic, p_pic );
- }
