adjust.c 21.8 KB
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/*****************************************************************************
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 * adjust.c : Contrast/Hue/Saturation/Brightness video plugin for vlc
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 *****************************************************************************
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 * Copyright (C) 2000-2006 the VideoLAN team
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 * $Id$
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 *
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 * Authors: Simon Latapie <garf@via.ecp.fr>
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 *          Antoine Cellerier <dionoea -at- videolan d0t org>
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 *
 * 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.
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 *
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 * 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
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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 *****************************************************************************/

/*****************************************************************************
 * Preamble
 *****************************************************************************/
#include <errno.h>
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#include <math.h>
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#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

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#include <vlc/vlc.h>
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#include <vlc_sout.h>
#include <vlc_vout.h>
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#include "vlc_filter.h"
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#include "filter_picture.h"
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#ifndef M_PI
#   define M_PI 3.14159265358979323846
#endif
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#define eight_times( x )    x x x x x x x x

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/*****************************************************************************
 * Local prototypes
 *****************************************************************************/
static int  Create    ( vlc_object_t * );
static void Destroy   ( vlc_object_t * );

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static picture_t *FilterPlanar( filter_t *, picture_t * );
static picture_t *FilterPacked( filter_t *, picture_t * );
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static int AdjustCallback( vlc_object_t *p_this, char const *psz_var,
                           vlc_value_t oldval, vlc_value_t newval,
                           void *p_data );
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/*****************************************************************************
 * Module descriptor
 *****************************************************************************/

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#define THRES_TEXT N_("Brightness threshold")
#define THRES_LONGTEXT N_("When this mode is enabled, pixels will be " \
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        "shown as black or white. The threshold value will be the brighness " \
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        "defined below." )
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#define CONT_TEXT N_("Image contrast (0-2)")
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#define CONT_LONGTEXT N_("Set the image contrast, between 0 and 2. Defaults to 1.")
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#define HUE_TEXT N_("Image hue (0-360)")
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#define HUE_LONGTEXT N_("Set the image hue, between 0 and 360. Defaults to 0.")
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#define SAT_TEXT N_("Image saturation (0-3)")
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#define SAT_LONGTEXT N_("Set the image saturation, between 0 and 3. Defaults to 1.")
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#define LUM_TEXT N_("Image brightness (0-2)")
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#define LUM_LONGTEXT N_("Set the image brightness, between 0 and 2. Defaults to 1.")
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#define GAMMA_TEXT N_("Image gamma (0-10)")
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#define GAMMA_LONGTEXT N_("Set the image gamma, between 0.01 and 10. Defaults to 1.")
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vlc_module_begin();
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    set_description( _("Image properties filter") );
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    set_shortname( _("Image adjust" ));
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    set_category( CAT_VIDEO );
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    set_subcategory( SUBCAT_VIDEO_VFILTER );
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    set_capability( "video filter2", 0 );
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    add_float_with_range( "contrast", 1.0, 0.0, 2.0, NULL,
                          CONT_TEXT, CONT_LONGTEXT, VLC_FALSE );
    add_float_with_range( "brightness", 1.0, 0.0, 2.0, NULL,
                           LUM_TEXT, LUM_LONGTEXT, VLC_FALSE );
    add_integer_with_range( "hue", 0, 0, 360, NULL,
                            HUE_TEXT, HUE_LONGTEXT, VLC_FALSE );
    add_float_with_range( "saturation", 1.0, 0.0, 3.0, NULL,
                          SAT_TEXT, SAT_LONGTEXT, VLC_FALSE );
    add_float_with_range( "gamma", 1.0, 0.01, 10.0, NULL,
                          GAMMA_TEXT, GAMMA_LONGTEXT, VLC_FALSE );

    add_bool( "brightness-threshold", 0, NULL,
              THRES_TEXT, THRES_LONGTEXT, VLC_FALSE );
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    add_shortcut( "adjust" );
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    set_callbacks( Create, Destroy );
vlc_module_end();

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static const char *ppsz_filter_options[] = {
    "contrast", "brightness", "hue", "saturation", "gamma",
    "brightness-threshold", NULL
};

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/*****************************************************************************
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 * filter_sys_t: adjust filter method descriptor
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 *****************************************************************************/
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struct filter_sys_t
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{
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    double     f_contrast;
    double     f_brightness;
    int        i_hue;
    double     f_saturation;
    double     f_gamma;
    vlc_bool_t b_brightness_threshold;
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};

/*****************************************************************************
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 * Create: allocates adjust video filter
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 *****************************************************************************/
static int Create( vlc_object_t *p_this )
{
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    filter_t *p_filter = (filter_t *)p_this;
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    filter_sys_t *p_sys;
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    switch( p_filter->fmt_in.video.i_chroma )
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    {
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        CASE_PLANAR_YUV
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            /* Planar YUV */
            p_filter->pf_video_filter = FilterPlanar;
            break;

        CASE_PACKED_YUV_422
            /* Packed YUV 4:2:2 */
            p_filter->pf_video_filter = FilterPacked;
            break;

        default:
            msg_Err( p_filter, "Unsupported input chroma (%4s)",
                     (char*)&(p_filter->fmt_in.video.i_chroma) );
            return VLC_EGENERIC;
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    }

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    if( p_filter->fmt_in.video.i_chroma != p_filter->fmt_out.video.i_chroma )
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    {
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        msg_Err( p_filter, "Input and output chromas don't match" );
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        return VLC_EGENERIC;
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    }
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    /* Allocate structure */
    p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
    if( p_filter->p_sys == NULL )
    {
        msg_Err( p_filter, "out of memory" );
        return VLC_ENOMEM;
    }
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    p_sys = p_filter->p_sys;
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    /* needed to get options passed in transcode using the
     * adjust{name=value} syntax */
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    config_ChainParse( p_filter, "", ppsz_filter_options,
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                   p_filter->p_cfg );

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    p_sys->f_contrast = var_CreateGetFloatCommand( p_filter, "contrast" );
    p_sys->f_brightness = var_CreateGetFloatCommand( p_filter, "brightness" );
    p_sys->i_hue = var_CreateGetIntegerCommand( p_filter, "hue" );
    p_sys->f_saturation = var_CreateGetFloatCommand( p_filter, "saturation" );
    p_sys->f_gamma = var_CreateGetFloatCommand( p_filter, "gamma" );
    p_sys->b_brightness_threshold =
        var_CreateGetBoolCommand( p_filter, "brightness-threshold" );

    var_AddCallback( p_filter, "contrast",   AdjustCallback, p_sys );
    var_AddCallback( p_filter, "brightness", AdjustCallback, p_sys );
    var_AddCallback( p_filter, "hue",        AdjustCallback, p_sys );
    var_AddCallback( p_filter, "saturation", AdjustCallback, p_sys );
    var_AddCallback( p_filter, "gamma",      AdjustCallback, p_sys );
    var_AddCallback( p_filter, "brightness-threshold",
                                             AdjustCallback, p_sys );
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    return VLC_SUCCESS;
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}

/*****************************************************************************
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 * Destroy: destroy adjust video filter
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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;
    free( p_filter->p_sys );
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}

/*****************************************************************************
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 * Run the filter on a Planar YUV picture
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 *****************************************************************************/
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static picture_t *FilterPlanar( filter_t *p_filter, picture_t *p_pic )
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{
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    int pi_luma[256];
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    int pi_gamma[256];
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    picture_t *p_outpic;
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    uint8_t *p_in, *p_in_v, *p_in_end, *p_line_end;
    uint8_t *p_out, *p_out_v;
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    vlc_bool_t b_thres;
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    double  f_hue;
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    double  f_gamma;
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    int32_t i_cont, i_lum;
    int i_sat, i_sin, i_cos, i_x, i_y;
    int i;
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    filter_sys_t *p_sys = p_filter->p_sys;
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    if( !p_pic ) return NULL;

    p_outpic = p_filter->pf_vout_buffer_new( p_filter );
    if( !p_outpic )
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    {
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        msg_Warn( p_filter, "can't get output picture" );
        if( p_pic->pf_release )
            p_pic->pf_release( p_pic );
        return NULL;
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    }
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    /* Getvariables */
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    i_cont = (int)( p_sys->f_contrast * 255 );
    i_lum = (int)( (p_sys->f_brightness - 1.0)*255 );
    f_hue = (float)( p_sys->i_hue * M_PI / 180 );
    i_sat = (int)( p_sys->f_saturation * 256 );
    f_gamma = 1.0 / p_sys->f_gamma;
    b_thres = p_sys->b_brightness_threshold;
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    /*
     * Threshold mode drops out everything about luma, contrast and gamma.
     */
    if( b_thres != VLC_TRUE )
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    {

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        /* Contrast is a fast but kludged function, so I put this gap to be
         * cleaner :) */
        i_lum += 128 - i_cont / 2;

        /* Fill the gamma lookup table */
        for( i = 0 ; i < 256 ; i++ )
        {
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          pi_gamma[ i ] = clip_uint8_vlc( pow(i / 255.0, f_gamma) * 255.0);
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        }

        /* Fill the luma lookup table */
        for( i = 0 ; i < 256 ; i++ )
        {
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            pi_luma[ i ] = pi_gamma[clip_uint8_vlc( i_lum + i_cont * i / 256)];
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        }
    }
    else
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    {
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        /*
         * We get luma as threshold value: the higher it is, the darker is
         * the image. Should I reverse this?
         */
        for( i = 0 ; i < 256 ; i++ )
        {
            pi_luma[ i ] = (i < i_lum) ? 0 : 255;
        }

        /*
         * Desaturates image to avoid that strange yellow halo...
         */
        i_sat = 0;
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    }

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    /*
     * Do the Y plane
     */

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    p_in = p_pic->p[Y_PLANE].p_pixels;
    p_in_end = p_in + p_pic->p[Y_PLANE].i_visible_lines
                      * p_pic->p[Y_PLANE].i_pitch - 8;
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    p_out = p_outpic->p[Y_PLANE].p_pixels;
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    for( ; p_in < p_in_end ; )
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    {
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        p_line_end = p_in + p_pic->p[Y_PLANE].i_visible_pitch - 8;
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        for( ; p_in < p_line_end ; )
        {
            /* Do 8 pixels at a time */
            *p_out++ = pi_luma[ *p_in++ ]; *p_out++ = pi_luma[ *p_in++ ];
            *p_out++ = pi_luma[ *p_in++ ]; *p_out++ = pi_luma[ *p_in++ ];
            *p_out++ = pi_luma[ *p_in++ ]; *p_out++ = pi_luma[ *p_in++ ];
            *p_out++ = pi_luma[ *p_in++ ]; *p_out++ = pi_luma[ *p_in++ ];
        }
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        p_line_end += 8;

        for( ; p_in < p_line_end ; )
        {
            *p_out++ = pi_luma[ *p_in++ ];
        }

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        p_in += p_pic->p[Y_PLANE].i_pitch
              - p_pic->p[Y_PLANE].i_visible_pitch;
        p_out += p_outpic->p[Y_PLANE].i_pitch
               - p_outpic->p[Y_PLANE].i_visible_pitch;
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    }
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    /*
     * Do the U and V planes
     */

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    p_in = p_pic->p[U_PLANE].p_pixels;
    p_in_v = p_pic->p[V_PLANE].p_pixels;
    p_in_end = p_in + p_pic->p[U_PLANE].i_visible_lines
                      * p_pic->p[U_PLANE].i_pitch - 8;
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    p_out = p_outpic->p[U_PLANE].p_pixels;
    p_out_v = p_outpic->p[V_PLANE].p_pixels;
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    i_sin = sin(f_hue) * 256;
    i_cos = cos(f_hue) * 256;

    i_x = ( cos(f_hue) + sin(f_hue) ) * 32768;
    i_y = ( cos(f_hue) - sin(f_hue) ) * 32768;

    if ( i_sat > 256 )
    {
#define WRITE_UV_CLIP() \
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    i_u = *p_in++ ; i_v = *p_in_v++ ; \
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    *p_out++ = clip_uint8_vlc( (( ((i_u * i_cos + i_v * i_sin - i_x) >> 8) \
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                           * i_sat) >> 8) + 128); \
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    *p_out_v++ = clip_uint8_vlc( (( ((i_v * i_cos - i_u * i_sin - i_y) >> 8) \
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                           * i_sat) >> 8) + 128)
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        uint8_t i_u, i_v;
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        for( ; p_in < p_in_end ; )
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        {
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            p_line_end = p_in + p_pic->p[U_PLANE].i_visible_pitch - 8;
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            for( ; p_in < p_line_end ; )
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            {
                /* Do 8 pixels at a time */
                WRITE_UV_CLIP(); WRITE_UV_CLIP();
                WRITE_UV_CLIP(); WRITE_UV_CLIP();
                WRITE_UV_CLIP(); WRITE_UV_CLIP();
                WRITE_UV_CLIP(); WRITE_UV_CLIP();
            }

            p_line_end += 8;

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            for( ; p_in < p_line_end ; )
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            {
                WRITE_UV_CLIP();
            }

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            p_in += p_pic->p[U_PLANE].i_pitch
                  - p_pic->p[U_PLANE].i_visible_pitch;
            p_in_v += p_pic->p[V_PLANE].i_pitch
                    - p_pic->p[V_PLANE].i_visible_pitch;
            p_out += p_outpic->p[U_PLANE].i_pitch
                   - p_outpic->p[U_PLANE].i_visible_pitch;
            p_out_v += p_outpic->p[V_PLANE].i_pitch
                     - p_outpic->p[V_PLANE].i_visible_pitch;
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        }
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#undef WRITE_UV_CLIP
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    }
    else
    {
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#define WRITE_UV() \
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    i_u = *p_in++ ; i_v = *p_in_v++ ; \
    *p_out++ = (( ((i_u * i_cos + i_v * i_sin - i_x) >> 8) \
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                       * i_sat) >> 8) + 128; \
    *p_out_v++ = (( ((i_v * i_cos - i_u * i_sin - i_y) >> 8) \
                       * i_sat) >> 8) + 128
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        uint8_t i_u, i_v;
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        for( ; p_in < p_in_end ; )
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        {
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            p_line_end = p_in + p_pic->p[U_PLANE].i_visible_pitch - 8;
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            for( ; p_in < p_line_end ; )
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            {
                /* Do 8 pixels at a time */
                WRITE_UV(); WRITE_UV(); WRITE_UV(); WRITE_UV();
                WRITE_UV(); WRITE_UV(); WRITE_UV(); WRITE_UV();
            }

            p_line_end += 8;

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            for( ; p_in < p_line_end ; )
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            {
                WRITE_UV();
            }

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            p_in += p_pic->p[U_PLANE].i_pitch
                  - p_pic->p[U_PLANE].i_visible_pitch;
            p_in_v += p_pic->p[V_PLANE].i_pitch
                    - p_pic->p[V_PLANE].i_visible_pitch;
            p_out += p_outpic->p[U_PLANE].i_pitch
                   - p_outpic->p[U_PLANE].i_visible_pitch;
            p_out_v += p_outpic->p[V_PLANE].i_pitch
                     - p_outpic->p[V_PLANE].i_visible_pitch;
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        }
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#undef WRITE_UV
    }

    p_outpic->date = p_pic->date;
    p_outpic->b_force = p_pic->b_force;
    p_outpic->i_nb_fields = p_pic->i_nb_fields;
    p_outpic->b_progressive = p_pic->b_progressive;
    p_outpic->b_top_field_first = p_pic->b_top_field_first;

    if( p_pic->pf_release )
        p_pic->pf_release( p_pic );

    return p_outpic;
}

/*****************************************************************************
 * Run the filter on a Packed YUV picture
 *****************************************************************************/
static picture_t *FilterPacked( filter_t *p_filter, picture_t *p_pic )
{
    int pi_luma[256];
    int pi_gamma[256];

    picture_t *p_outpic;
    uint8_t *p_in, *p_in_v, *p_in_end, *p_line_end;
    uint8_t *p_out, *p_out_v;
    int i_y_offset, i_u_offset, i_v_offset;

    int i_lines, i_visible_lines, i_pitch, i_visible_pitch;

    vlc_bool_t b_thres;
    double  f_hue;
    double  f_gamma;
    int32_t i_cont, i_lum;
    int i_sat, i_sin, i_cos, i_x, i_y;
    int i;

    filter_sys_t *p_sys = p_filter->p_sys;

    if( !p_pic ) return NULL;

    i_lines = p_pic->p->i_lines;
    i_visible_lines = p_pic->p->i_visible_lines;
    i_pitch = p_pic->p->i_pitch;
    i_visible_pitch = p_pic->p->i_visible_pitch;

    if( GetPackedYuvOffsets( p_pic->format.i_chroma, &i_y_offset,
                             &i_u_offset, &i_v_offset ) != VLC_SUCCESS )
    {
        msg_Warn( p_filter, "Unsupported input chroma (%4s)",
                  (char*)&(p_pic->format.i_chroma) );
        if( p_pic->pf_release )
            p_pic->pf_release( p_pic );
        return NULL;
    }

    p_outpic = p_filter->pf_vout_buffer_new( p_filter );
    if( !p_outpic )
    {
        msg_Warn( p_filter, "can't get output picture" );
        if( p_pic->pf_release )
            p_pic->pf_release( p_pic );
        return NULL;
    }

    /* Getvariables */
    i_cont = (int)( p_sys->f_contrast * 255 );
    i_lum = (int)( (p_sys->f_brightness - 1.0)*255 );
    f_hue = (float)( p_sys->i_hue * M_PI / 180 );
    i_sat = (int)( p_sys->f_saturation * 256 );
    f_gamma = 1.0 / p_sys->f_gamma;
    b_thres = p_sys->b_brightness_threshold;

    /*
     * Threshold mode drops out everything about luma, contrast and gamma.
     */
    if( b_thres != VLC_TRUE )
    {

        /* Contrast is a fast but kludged function, so I put this gap to be
         * cleaner :) */
        i_lum += 128 - i_cont / 2;

        /* Fill the gamma lookup table */
        for( i = 0 ; i < 256 ; i++ )
        {
          pi_gamma[ i ] = clip_uint8_vlc( pow(i / 255.0, f_gamma) * 255.0);
        }

        /* Fill the luma lookup table */
        for( i = 0 ; i < 256 ; i++ )
        {
            pi_luma[ i ] = pi_gamma[clip_uint8_vlc( i_lum + i_cont * i / 256)];
        }
    }
    else
    {
        /*
         * We get luma as threshold value: the higher it is, the darker is
         * the image. Should I reverse this?
         */
        for( i = 0 ; i < 256 ; i++ )
        {
            pi_luma[ i ] = (i < i_lum) ? 0 : 255;
        }

        /*
         * Desaturates image to avoid that strange yellow halo...
         */
        i_sat = 0;
    }

    /*
     * Do the Y plane
     */

    p_in = p_pic->p->p_pixels + i_y_offset;
    p_in_end = p_in + p_pic->p->i_visible_lines * p_pic->p->i_pitch - 8 * 4;

    p_out = p_outpic->p->p_pixels + i_y_offset;

    for( ; p_in < p_in_end ; )
    {
        p_line_end = p_in + i_visible_pitch - 8 * 4;

        for( ; p_in < p_line_end ; )
        {
            /* Do 8 pixels at a time */
            *p_out = pi_luma[ *p_in ]; p_in += 2; p_out += 2;
            *p_out = pi_luma[ *p_in ]; p_in += 2; p_out += 2;
            *p_out = pi_luma[ *p_in ]; p_in += 2; p_out += 2;
            *p_out = pi_luma[ *p_in ]; p_in += 2; p_out += 2;
            *p_out = pi_luma[ *p_in ]; p_in += 2; p_out += 2;
            *p_out = pi_luma[ *p_in ]; p_in += 2; p_out += 2;
            *p_out = pi_luma[ *p_in ]; p_in += 2; p_out += 2;
            *p_out = pi_luma[ *p_in ]; p_in += 2; p_out += 2;
        }

        p_line_end += 8 * 4;

        for( ; p_in < p_line_end ; )
        {
            *p_out = pi_luma[ *p_in ]; p_in += 2; p_out += 2;
        }

        p_in += i_pitch - p_pic->p->i_visible_pitch;
        p_out += i_pitch - p_outpic->p->i_visible_pitch;
    }

    /*
     * Do the U and V planes
     */

    p_in = p_pic->p->p_pixels + i_u_offset;
    p_in_v = p_pic->p->p_pixels + i_v_offset;
    p_in_end = p_in + i_visible_lines * i_pitch - 8 * 4;

    p_out = p_outpic->p->p_pixels + i_u_offset;
    p_out_v = p_outpic->p->p_pixels + i_v_offset;

    i_sin = sin(f_hue) * 256;
    i_cos = cos(f_hue) * 256;

    i_x = ( cos(f_hue) + sin(f_hue) ) * 32768;
    i_y = ( cos(f_hue) - sin(f_hue) ) * 32768;

    if ( i_sat > 256 )
    {
#define WRITE_UV_CLIP() \
    i_u = *p_in; p_in += 4; i_v = *p_in_v; p_in_v += 4; \
    *p_out = clip_uint8_vlc( (( ((i_u * i_cos + i_v * i_sin - i_x) >> 8) \
                           * i_sat) >> 8) + 128); \
    p_out += 4; \
    *p_out_v = clip_uint8_vlc( (( ((i_v * i_cos - i_u * i_sin - i_y) >> 8) \
                           * i_sat) >> 8) + 128); \
    p_out_v += 4

        uint8_t i_u, i_v;

        for( ; p_in < p_in_end ; )
        {
            p_line_end = p_in + i_visible_pitch - 8 * 4;

            for( ; p_in < p_line_end ; )
            {
                /* Do 8 pixels at a time */
                WRITE_UV_CLIP(); WRITE_UV_CLIP();
                WRITE_UV_CLIP(); WRITE_UV_CLIP();
                WRITE_UV_CLIP(); WRITE_UV_CLIP();
                WRITE_UV_CLIP(); WRITE_UV_CLIP();
            }

            p_line_end += 8 * 4;

            for( ; p_in < p_line_end ; )
            {
                WRITE_UV_CLIP();
            }

            p_in += i_pitch - i_visible_pitch;
            p_in_v += i_pitch - i_visible_pitch;
            p_out += i_pitch - i_visible_pitch;
            p_out_v += i_pitch - i_visible_pitch;
        }
#undef WRITE_UV_CLIP
    }
    else
    {
#define WRITE_UV() \
    i_u = *p_in; p_in += 4; i_v = *p_in_v; p_in_v += 4; \
    *p_out = (( ((i_u * i_cos + i_v * i_sin - i_x) >> 8) \
                       * i_sat) >> 8) + 128; \
    p_out += 4; \
    *p_out_v = (( ((i_v * i_cos - i_u * i_sin - i_y) >> 8) \
                       * i_sat) >> 8) + 128; \
    p_out_v += 4

        uint8_t i_u, i_v;

        for( ; p_in < p_in_end ; )
        {
            p_line_end = p_in + i_visible_pitch - 8 * 4;

            for( ; p_in < p_line_end ; )
            {
                /* Do 8 pixels at a time */
                WRITE_UV(); WRITE_UV(); WRITE_UV(); WRITE_UV();
                WRITE_UV(); WRITE_UV(); WRITE_UV(); WRITE_UV();
            }

            p_line_end += 8 * 4;

            for( ; p_in < p_line_end ; )
            {
                WRITE_UV();
            }

            p_in += i_pitch - i_visible_pitch;
            p_in_v += i_pitch - i_visible_pitch;
            p_out += i_pitch - i_visible_pitch;
            p_out_v += i_pitch - i_visible_pitch;
        }
#undef WRITE_UV
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    }

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    p_outpic->date = p_pic->date;
    p_outpic->b_force = p_pic->b_force;
    p_outpic->i_nb_fields = p_pic->i_nb_fields;
    p_outpic->b_progressive = p_pic->b_progressive;
    p_outpic->b_top_field_first = p_pic->b_top_field_first;
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    if( p_pic->pf_release )
        p_pic->pf_release( p_pic );
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    return p_outpic;
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}
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static int AdjustCallback( vlc_object_t *p_this, char const *psz_var,
                           vlc_value_t oldval, vlc_value_t newval,
                           void *p_data )
{
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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;

    if( !strcmp( psz_var, "contrast" ) )
        p_sys->f_contrast = newval.f_float;
    else if( !strcmp( psz_var, "brightness" ) )
        p_sys->f_brightness = newval.f_float;
    else if( !strcmp( psz_var, "hue" ) )
        p_sys->i_hue = newval.i_int;
    else if( !strcmp( psz_var, "saturation" ) )
        p_sys->f_saturation = newval.f_float;
    else if( !strcmp( psz_var, "gamma" ) )
        p_sys->f_gamma = newval.f_float;
    else if( !strcmp( psz_var, "brightness-threshold" ) )
        p_sys->b_brightness_threshold = newval.b_bool;
    else
        return VLC_EGENERIC;
    return VLC_SUCCESS;
}