distort.c

video linux conference

/*****************************************************************************
 * distort.c : Misc video effects plugin for vlc
 *****************************************************************************
 * Copyright (C) 2000, 2001, 2002, 2003 VideoLAN
 * $Id: distort.c 10145 2005-03-05 16:49:15Z gbazin $
 *
 * Authors: Samuel Hocevar <[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., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
 *****************************************************************************/

/*****************************************************************************
 * Preamble
 *****************************************************************************/
#include <stdlib.h>                                      /* malloc(), free() */
#include <string.h>

#include <math.h>                                            /* sin(), cos() */

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

#include "filter_common.h"

#define DISTORT_MODE_WAVE    1
#define DISTORT_MODE_RIPPLE  2

/*****************************************************************************
 * 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 void DistortWave    ( vout_thread_t *, picture_t *, picture_t * );
static void DistortRipple  ( vout_thread_t *, picture_t *, picture_t * );

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

/*****************************************************************************
 * Module descriptor
 *****************************************************************************/
#define MODE_TEXT N_("Distort mode")
#define MODE_LONGTEXT N_("Distort mode, one of \"wave\" and \"ripple\"")

static char *mode_list[] = { "wave", "ripple" };
static char *mode_list_text[] = { N_("Wave"), N_("Ripple") };

vlc_module_begin();
    set_description( _("Distort video filter") );
    set_shortname( N_( "Distortion" ));
    set_capability( "video filter", 0 );
    set_category( CAT_VIDEO );
    set_subcategory( SUBCAT_VIDEO_VFILTER );

    add_string( "distort-mode", "wave", NULL, MODE_TEXT, MODE_LONGTEXT,
                VLC_FALSE );
        change_string_list( mode_list, mode_list_text, 0 );

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

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

    /* For the wave mode */
    double  f_angle;
    mtime_t last_date;
};

/*****************************************************************************
 * 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 Distort video thread output method
 *****************************************************************************
 * This function allocates and initializes a Distort vout method.
 *****************************************************************************/
static int Create( vlc_object_t *p_this )
{
    vout_thread_t *p_vout = (vout_thread_t *)p_this;
    char *psz_method, *psz_method_tmp;

    /* 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;

    p_vout->p_sys->i_mode = 0;

    if( !(psz_method = psz_method_tmp
          = config_GetPsz( p_vout, "distort-mode" )) )
    {
        msg_Err( p_vout, "configuration variable %s empty, using 'wave'",
                         "distort-mode" );
        p_vout->p_sys->i_mode = DISTORT_MODE_WAVE;
    }
    else
    {

        if( !strcmp( psz_method, "wave" ) )
        {
            p_vout->p_sys->i_mode = DISTORT_MODE_WAVE;
        }
        else if( !strcmp( psz_method, "ripple" ) )
        {
            p_vout->p_sys->i_mode = DISTORT_MODE_RIPPLE;
        }
        else
        {
            msg_Err( p_vout, "no valid distort mode provided, "
                             "using wave" );
            p_vout->p_sys->i_mode = DISTORT_MODE_WAVE;
        }
    }
    free( psz_method_tmp );

    return VLC_SUCCESS;
}

/*****************************************************************************
 * Init: initialize Distort 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, "cannot open vout, aborting" );
        return VLC_EGENERIC;
    }

    ALLOCATE_DIRECTBUFFERS( VOUT_MAX_PICTURES );

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

    ADD_PARENT_CALLBACKS( SendEventsToChild );

    p_vout->p_sys->f_angle = 0.0;
    p_vout->p_sys->last_date = 0;

    return VLC_SUCCESS;
}

/*****************************************************************************
 * End: terminate Distort 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 Distort video thread output method
 *****************************************************************************
 * Terminate an output method created by DistortCreateOutputMethod