adjust.c

uclinux 下的vlc播放器源代码

/*****************************************************************************
 * adjust.c : Contrast/Hue/Saturation/Brightness video plugin for vlc
 *****************************************************************************
 * Copyright (C) 2000, 2001, 2002, 2003 the VideoLAN team
 * $Id: adjust.c 17012 2006-10-09 22:11:32Z xtophe $
 *
 * Authors: Simon Latapie <[e-mail]>
 *
 * 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
 *****************************************************************************/
#include <errno.h>
#include <stdlib.h>                                      /* malloc(), free() */
#include <string.h>
#include <math.h>

#include <vlc/vlc.h>
#include <vlc/vout.h>

#include "filter_common.h"

#ifndef M_PI
#   define M_PI 3.14159265358979323846
#endif

#define eight_times( x )    x x x x x x x x

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

static int  Init      ( vout_thread_t * );
static void End       ( vout_thread_t * );
static void Render    ( vout_thread_t *, picture_t * );

static int  SendEvents( vlc_object_t *, char const *,
                        vlc_value_t, vlc_value_t, void * );

/*****************************************************************************
 * Module descriptor
 *****************************************************************************/

#define THRES_TEXT N_("Brightness threshold")
#define THRES_LONGTEXT N_("When this mode is enabled, pixels will be " \
        "shown as black or white. The threshold value will be the brighness " \
        "defined below." )
#define CONT_TEXT N_("Image contrast (0-2)")
#define CONT_LONGTEXT N_("Set the image contrast, between 0 and 2. Defaults to 1.")
#define HUE_TEXT N_("Image hue (0-360)")
#define HUE_LONGTEXT N_("Set the image hue, between 0 and 360. Defaults to 0.")
#define SAT_TEXT N_("Image saturation (0-3)")
#define SAT_LONGTEXT N_("Set the image saturation, between 0 and 3. Defaults to 1.")
#define LUM_TEXT N_("Image brightness (0-2)")
#define LUM_LONGTEXT N_("Set the image brightness, between 0 and 2. Defaults to 1.")
#define GAMMA_TEXT N_("Image gamma (0-10)")
#define GAMMA_LONGTEXT N_("Set the image gamma, between 0.01 and 10. Defaults to 1.")


vlc_module_begin();
    set_description( _("Image properties filter") );
    set_shortname( _("Image adjust" ));
    set_category( CAT_VIDEO );
    set_subcategory( SUBCAT_VIDEO_VFILTER );
    set_capability( "video filter", 0 );

    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 );

    add_shortcut( "adjust" );
    set_callbacks( Create, Destroy );
vlc_module_end();

/*****************************************************************************
 * vout_sys_t: adjust video output method descriptor
 *****************************************************************************
 * This structure is part of the video output thread descriptor.
 * It describes the adjust specific properties of an output thread.
 *****************************************************************************/
struct vout_sys_t
{
    vout_thread_t *p_vout;
};

inline static int32_t clip( int32_t a )
{
    return (a > 255) ? 255 : (a < 0) ? 0 : a;
}

/*****************************************************************************
 * Control: control facility for the vout (forwards to child vout)
 *****************************************************************************/
static int Control( vout_thread_t *p_vout, int i_query, va_list args )
{
    return vout_vaControl( p_vout->p_sys->p_vout, i_query, args );
}

/*****************************************************************************
 * Create: allocates adjust video thread output method
 *****************************************************************************
 * This function allocates and initializes a adjust vout method.
 *****************************************************************************/
static int Create( vlc_object_t *p_this )
{
    vout_thread_t *p_vout = (vout_thread_t *)p_this;

    /* Allocate structure */
    p_vout->p_sys = malloc( sizeof( vout_sys_t ) );
    if( p_vout->p_sys == NULL )
    {
        msg_Err( p_vout, "out of memory" );
        return VLC_ENOMEM;
    }

    p_vout->pf_init = Init;
    p_vout->pf_end = End;
    p_vout->pf_manage = NULL;
    p_vout->pf_render = Render;
    p_vout->pf_display = NULL;
    p_vout->pf_control = Control;

    var_Create( p_vout, "contrast", VLC_VAR_FLOAT | VLC_VAR_DOINHERIT );
    var_Create( p_vout, "brightness", VLC_VAR_FLOAT | VLC_VAR_DOINHERIT );
    var_Create( p_vout, "hue", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
    var_Create( p_vout, "saturation", VLC_VAR_FLOAT | VLC_VAR_DOINHERIT );
    var_Create( p_vout, "gamma", VLC_VAR_FLOAT | VLC_VAR_DOINHERIT );
    var_Create( p_vout, "brightness-threshold",
                VLC_VAR_BOOL | VLC_VAR_DOINHERIT );

    return VLC_SUCCESS;
}

/*****************************************************************************
 * Init: initialize adjust video thread output method
 *****************************************************************************/
static int Init( vout_thread_t *p_vout )
{
    int i_index;
    picture_t *p_pic;
    video_format_t fmt = {0};

    I_OUTPUTPICTURES = 0;

    /* Initialize the output structure */
    p_vout->output.i_chroma = p_vout->render.i_chroma;
    p_vout->output.i_width  = p_vout->render.i_width;
    p_vout->output.i_height = p_vout->render.i_height;
    p_vout->output.i_aspect = p_vout->render.i_aspect;

    fmt.i_width = fmt.i_visible_width = p_vout->render.i_width;
    fmt.i_height = fmt.i_visible_height = p_vout->render.i_height;
    fmt.i_x_offset = fmt.i_y_offset = 0;
    fmt.i_chroma = p_vout->render.i_chroma;
    fmt.i_aspect = p_vout->render.i_aspect;
    fmt.i_sar_num = p_vout->render.i_aspect * fmt.i_height / fmt.i_width;
    fmt.i_sar_den = VOUT_ASPECT_FACTOR;

    /* Try to open the real video output */
    msg_Dbg( p_vout, "spawning the real video output" );

    p_vout->p_sys->p_vout = vout_Create( p_vout, &fmt );

    /* Everything failed */
    if( p_vout->p_sys->p_vout == NULL )
    {
        msg_Err( p_vout, "can't open vout, aborting" );
        return VLC_EGENERIC;
    }

    ALLOCATE_DIRECTBUFFERS( VOUT_MAX_PICTURES );

    ADD_CALLBACKS( p_vout->p_sys->p_vout, SendEvents );

    ADD_PARENT_CALLBACKS( SendEventsToChild );

    return VLC_SUCCESS;
}

/*****************************************************************************
 * End: terminate adjust video thread output method
 *****************************************************************************/
static void End( vout_thread_t *p_vout )
{
    int i_index;

    /* Free the fake output buffers we allocated */
    for( i_index = I_OUTPUTPICTURES ; i_index ; )
    {
        i_index--;
        free( PP_OUTPUTPICTURE[ i_index ]->p_data_orig );
    }
}

/*****************************************************************************
 * Destroy: destroy adjust video thread output method
 *****************************************************************************
 * Terminate an output method created by adjustCreateOutputMethod
 *****************************************************************************/
static void Destroy( vlc_object_t *p_this )
{
    vout_thread_t *p_vout = (vout_thread_t *)p_this;

    if( p_vout->p_sys->p_vout )
    {
        DEL_CALLBACKS( p_vout->p_sys->p_vout, SendEvents );
        vlc_object_detach( p_vout->p_sys->p_vout );
        vout_Destroy( p_vout->p_sys->p_vout );
    }

    DEL_PARENT_CALLBACKS( SendEventsToChild );

    free( p_vout->p_sys );
}