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vlc/modules/video_filter/posterize.c
Rémi Duraffort 728866a80a posterize: remove unused variable (set but not used)
2011-05-15 10:21:02 +02:00

458 lines
18 KiB
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/*****************************************************************************
* posterize.c : Posterize video plugin for vlc
*****************************************************************************
* Copyright (C) 2010 the VideoLAN team
* $Id$
*
* Authors: Branko Kokanovic <branko.kokanovic@gmail.com>
*
* 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 <assert.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 * );
static void PlanarYUVPosterize( picture_t *, picture_t *, int);
static void PackedYUVPosterize( picture_t *, picture_t *, int);
static void RVPosterize( picture_t *, picture_t *, bool, int );
static void YuvPosterization( uint8_t *, uint8_t *, uint8_t *, uint8_t *,
uint8_t, uint8_t, uint8_t, uint8_t, int );
static const char *const ppsz_filter_options[] = {
"level", NULL
};
/*****************************************************************************
* Module descriptor
*****************************************************************************/
#define POSTERIZE_LEVEL_TEXT N_("Posterize level")
#define POSTERIZE_LEVEL_LONGTEXT N_("Posterize level "\
"(number of colors is cube of this value)" )
#define CFG_PREFIX "posterize-"
vlc_module_begin ()
set_description( N_("Posterize video filter") )
set_shortname( N_("Posterize" ) )
set_help( N_("Posterize video by lowering the number of colors") )
set_category( CAT_VIDEO )
set_subcategory( SUBCAT_VIDEO_VFILTER )
set_capability( "video filter2", 0 )
add_integer_with_range( CFG_PREFIX "level", 6, 2, 256,
POSTERIZE_LEVEL_TEXT, POSTERIZE_LEVEL_LONGTEXT,
false )
set_callbacks( Create, Destroy )
vlc_module_end ()
/*****************************************************************************
* callback prototypes
*****************************************************************************/
static int FilterCallback( vlc_object_t *, char const *,
vlc_value_t, vlc_value_t, void * );
/*****************************************************************************
* filter_sys_t: adjust filter method descriptor
*****************************************************************************/
struct filter_sys_t
{
int i_level;
vlc_mutex_t lock;
};
/*****************************************************************************
* Create: allocates Posterize video thread output method
*****************************************************************************
* This function allocates and initializes a Posterize vout method.
*****************************************************************************/
static int Create( vlc_object_t *p_this )
{
filter_t *p_filter = (filter_t *)p_this;
filter_sys_t *p_sys;
switch( p_filter->fmt_in.video.i_chroma )
{
CASE_PLANAR_YUV_SQUARE
break;
CASE_PACKED_YUV_422
break;
case VLC_CODEC_RGB24:
break;
case VLC_CODEC_RGB32:
break;
default:
msg_Err( p_filter, "Unsupported input chroma (%4.4s)",
(char*)&(p_filter->fmt_in.video.i_chroma) );
return VLC_EGENERIC;
}
if( p_filter->fmt_in.video.i_chroma != p_filter->fmt_out.video.i_chroma )
{
msg_Err( p_filter, "Input and output chromas don't match" );
return VLC_EGENERIC;
}
/* Allocate structure */
p_sys = p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
if( p_filter->p_sys == NULL )
return VLC_ENOMEM;
config_ChainParse( p_filter, CFG_PREFIX, ppsz_filter_options,
p_filter->p_cfg );
p_sys->i_level = var_CreateGetIntegerCommand( p_filter, CFG_PREFIX "level" );
vlc_mutex_init( &p_sys->lock );
var_AddCallback( p_filter, CFG_PREFIX "level", FilterCallback, NULL );
p_filter->pf_video_filter = Filter;
return VLC_SUCCESS;
}
/*****************************************************************************
* Destroy: destroy Posterize video thread output method
*****************************************************************************
* Terminate an output method created by PosterizeCreateOutputMethod
*****************************************************************************/
static void Destroy( vlc_object_t *p_this )
{
filter_t *p_filter = (filter_t *)p_this;
var_DelCallback( p_filter, CFG_PREFIX "level", FilterCallback, NULL );
vlc_mutex_destroy( &p_filter->p_sys->lock );
free( p_filter->p_sys );
}
/*****************************************************************************
* Render: displays previously rendered output
*****************************************************************************
* This function send the currently rendered image to Posterize image, waits
* until it is displayed and switch the two rendering buffers, preparing next
* frame.
*****************************************************************************/
static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
{
picture_t *p_outpic;
int level;
if( !p_pic ) return NULL;
filter_sys_t *p_sys = p_filter->p_sys;
vlc_mutex_lock( &p_sys->lock );
level = p_sys->i_level;
vlc_mutex_unlock( &p_sys->lock );
p_outpic = filter_NewPicture( p_filter );
if( !p_outpic )
{
msg_Warn( p_filter, "can't get output picture" );
picture_Release( p_pic );
return NULL;
}
switch( p_pic->format.i_chroma )
{
case VLC_CODEC_RGB24:
RVPosterize( p_pic, p_outpic, false, level );
break;
case VLC_CODEC_RGB32:
RVPosterize( p_pic, p_outpic, true, level );
break;
CASE_PLANAR_YUV_SQUARE
PlanarYUVPosterize( p_pic, p_outpic, level );
break;
CASE_PACKED_YUV_422
PackedYUVPosterize( p_pic, p_outpic, level );
break;
default:
assert( false );
}
return CopyInfoAndRelease( p_outpic, p_pic );
}
/*****************************************************************************
* For a given level, calculates new posterized value for pixel whose value x
* is in range of 0-255
*****************************************************************************/
#define POSTERIZE_PIXEL(x, level) \
(((( x * level ) >> 8 ) * 255 ) / ( level - 1 ))
/*****************************************************************************
* PlanarYUVPosterize: Posterize one frame of the planar YUV video
*****************************************************************************
* This function posterizes one frame of the video by iterating through video
* lines. In every pass, start of Y, U and V planes is calculated and for
* every pixel we calculate new values of YUV values.
*****************************************************************************/
static void PlanarYUVPosterize( picture_t *p_pic, picture_t *p_outpic,
int i_level )
{
uint8_t *p_in_y, *p_in_u, *p_in_v, *p_in_end_y, *p_line_end_y, *p_out_y,
*p_out_u, *p_out_v;
int i_current_line = 0;
p_in_y = p_pic->p[Y_PLANE].p_pixels;
p_in_end_y = p_in_y + p_pic->p[Y_PLANE].i_visible_lines
* p_pic->p[Y_PLANE].i_pitch;
p_out_y = p_outpic->p[Y_PLANE].p_pixels;
/* iterate for every visible line in the frame */
while( p_in_y < p_in_end_y )
{
p_line_end_y = p_in_y + p_pic->p[Y_PLANE].i_visible_pitch;
/* calculate start of U plane line */
p_in_u = p_pic->p[U_PLANE].p_pixels
+ p_pic->p[U_PLANE].i_pitch * ( i_current_line / 2 );
p_out_u = p_outpic->p[U_PLANE].p_pixels
+ p_outpic->p[U_PLANE].i_pitch * ( i_current_line / 2 );
/* calculate start of V plane line */
p_in_v = p_pic->p[V_PLANE].p_pixels
+ p_pic->p[V_PLANE].i_pitch * ( i_current_line / 2 );
p_out_v = p_outpic->p[V_PLANE].p_pixels
+ p_outpic->p[V_PLANE].i_pitch * ( i_current_line / 2 );
/* iterate for every two pixels in line */
while( p_in_y < p_line_end_y )
{
uint8_t y1, y2, u, v;
uint8_t posterized_y1, posterized_y2, posterized_u, posterized_v;
/* retrieve original YUV values */
y1 = *p_in_y++;
y2 = *p_in_y++;
u = *p_in_u++;
v = *p_in_v++;
/* do posterization */
YuvPosterization( &posterized_y1, &posterized_y2, &posterized_u,
&posterized_v, y1, y2, u, v, i_level );
/* put posterized valued */
*p_out_y++ = posterized_y1;
*p_out_y++ = posterized_y2;
*p_out_u++ = posterized_u;
*p_out_v++ = posterized_v;
}
p_in_y += p_pic->p[Y_PLANE].i_pitch
- p_pic->p[Y_PLANE].i_visible_pitch;
p_out_y += p_outpic->p[Y_PLANE].i_pitch
- p_outpic->p[Y_PLANE].i_visible_pitch;
i_current_line++;
}
}
/*****************************************************************************
* PackedYUVPosterize: Posterize one frame of the packed YUV video
*****************************************************************************
* This function posterizes one frame of the video by iterating through video
* lines. In every pass, we calculate new values for pixels (UYVY, VYUY, YUYV
* and YVYU formats are supported)
*****************************************************************************/
static void PackedYUVPosterize( picture_t *p_pic, picture_t *p_outpic, int i_level )
{
uint8_t *p_in, *p_in_end, *p_line_end, *p_out;
uint8_t y1, y2, u, v;
p_in = p_pic->p[0].p_pixels;
p_in_end = p_in + p_pic->p[0].i_visible_lines
* p_pic->p[0].i_pitch;
p_out = p_outpic->p[0].p_pixels;
while( p_in < p_in_end )
{
p_line_end = p_in + p_pic->p[0].i_visible_pitch;
while( p_in < p_line_end )
{
uint8_t posterized_y1, posterized_y2, posterized_u, posterized_v;
/* extract proper pixel values */
switch( p_pic->format.i_chroma )
{
case VLC_CODEC_UYVY:
u = *p_in++;
y1 = *p_in++;
v = *p_in++;
y2 = *p_in++;
break;
case VLC_CODEC_VYUY:
v = *p_in++;
y1 = *p_in++;
u = *p_in++;
y2 = *p_in++;
break;
case VLC_CODEC_YUYV:
y1 = *p_in++;
u = *p_in++;
y2 = *p_in++;
v = *p_in++;
break;
case VLC_CODEC_YVYU:
y1 = *p_in++;
v = *p_in++;
y2 = *p_in++;
u = *p_in++;
break;
default:
assert( false );
}
/* do posterization */
YuvPosterization( &posterized_y1, &posterized_y2, &posterized_u,
&posterized_v, y1, y2, u, v, i_level );
/* put posterized values in proper place */
switch( p_pic->format.i_chroma )
{
case VLC_CODEC_UYVY:
*p_out++ = posterized_u;
*p_out++ = posterized_y1;
*p_out++ = posterized_v;
*p_out++ = posterized_y2;
break;
case VLC_CODEC_VYUY:
*p_out++ = posterized_v;
*p_out++ = posterized_y1;
*p_out++ = posterized_u;
*p_out++ = posterized_y2;
break;
case VLC_CODEC_YUYV:
*p_out++ = posterized_y1;
*p_out++ = posterized_u;
*p_out++ = posterized_y2;
*p_out++ = posterized_v;
break;
case VLC_CODEC_YVYU:
*p_out++ = posterized_y1;
*p_out++ = posterized_v;
*p_out++ = posterized_y2;
*p_out++ = posterized_u;
break;
default:
assert( false );
}
}
p_in += p_pic->p[0].i_pitch - p_pic->p[0].i_visible_pitch;
p_out += p_outpic->p[0].i_pitch
- p_outpic->p[0].i_visible_pitch;
}
}
/*****************************************************************************
* RVPosterize: Posterize one frame of the RV24/RV32 video
*****************************************************************************
* This function posterizes one frame of the video by iterating through video
* lines and calculating new values for every byte in chunks of 3 (RV24) or
* 4 (RV32) bytes
*****************************************************************************/
static void RVPosterize( picture_t *p_pic, picture_t *p_outpic,
bool rv32, int level )
{
uint8_t *p_in, *p_in_end, *p_line_end, *p_out, pixel;
p_in = p_pic->p[0].p_pixels;
p_in_end = p_in + p_pic->p[0].i_visible_lines
* p_pic->p[0].i_pitch;
p_out = p_outpic->p[0].p_pixels;
while( p_in < p_in_end )
{
p_line_end = p_in + p_pic->p[0].i_visible_pitch;
while( p_in < p_line_end )
{
pixel = *p_in++;
*p_out++ = POSTERIZE_PIXEL( pixel, level );
pixel = *p_in++;
*p_out++ = POSTERIZE_PIXEL( pixel, level );
pixel = *p_in++;
*p_out++ = POSTERIZE_PIXEL( pixel, level );
/* for rv32 we take 4 chunks at the time */
if ( rv32 )
{
pixel = *p_in++;
*p_out++ = POSTERIZE_PIXEL( pixel, level );
}
}
p_in += p_pic->p[0].i_pitch - p_pic->p[0].i_visible_pitch;
p_out += p_outpic->p[0].i_pitch
- p_outpic->p[0].i_visible_pitch;
}
}
/*****************************************************************************
* YuvPosterization: Lowers the color depth of YUV color space
*****************************************************************************
* This function lowers the color level of YUV color space to specified level
* by converting YUV color values to theirs RGB equivalents, calculates new
* values and then converts RGB values to YUV values again.
*****************************************************************************/
static void YuvPosterization( uint8_t* posterized_y1, uint8_t* posterized_y2,
uint8_t* posterized_u, uint8_t* posterized_v,
uint8_t y1, uint8_t y2, uint8_t u, uint8_t v,
int i_level ) {
int r1, g1, b1; /* for y1 new value */
int r2, b2, g2; /* for y2 new value */
int r3, g3, b3; /* for new values of u and v */
/* fist convert YUV -> RGB */
yuv_to_rgb( &r1, &g1, &b1, y1, u, v );
yuv_to_rgb( &r2, &g2, &b2, y1, u, v );
yuv_to_rgb( &r3, &g3, &b3, ( y1 + y2 ) / 2, u, v );
/* round RGB values to specified posterize level */
r1 = POSTERIZE_PIXEL( r1, i_level );
g1 = POSTERIZE_PIXEL( g1, i_level );
b1 = POSTERIZE_PIXEL( b1, i_level );
r2 = POSTERIZE_PIXEL( r2, i_level );
g2 = POSTERIZE_PIXEL( g2, i_level );
b2 = POSTERIZE_PIXEL( b2, i_level );
r3 = POSTERIZE_PIXEL( r3, i_level );
g3 = POSTERIZE_PIXEL( g3, i_level );
b3 = POSTERIZE_PIXEL( b3, i_level );
/* convert from calculated RGB -> YUV */
*posterized_y1 = ( ( 66 * r1 + 129 * g1 + 25 * b1 + 128 ) >> 8 ) + 16;
*posterized_y2 = ( ( 66 * r2 + 129 * g2 + 25 * b2 + 128 ) >> 8 ) + 16;
*posterized_u = ( ( -38 * r3 - 74 * g3 + 112 * b3 + 128 ) >> 8 ) + 128;
*posterized_v = ( ( 112 * r3 - 94 * g3 - 18 * b3 + 128 ) >> 8 ) + 128;
}
static int FilterCallback ( vlc_object_t *p_this, char const *psz_var,
vlc_value_t oldval, vlc_value_t newval, void *p_data )
{
(void)oldval; (void)p_data;
filter_t *p_filter = (filter_t*)p_this;
filter_sys_t *p_sys = p_filter->p_sys;
if( !strcmp( psz_var, CFG_PREFIX "level" ) )
{
vlc_mutex_lock( &p_sys->lock );
p_sys->i_level = newval.i_int;
vlc_mutex_unlock( &p_sys->lock );
}
return VLC_SUCCESS;
}
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