effects.c

video linux conference

/*****************************************************************************
 * effects.c : Effects for the visualization system
 *****************************************************************************
 * Copyright (C) 2002 VideoLAN
 * $Id: effects.c 10101 2005-03-02 16:47:31Z robux4 $
 *
 * Authors: Cl閙ent Stenac <[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 <vlc/vlc.h>
#include <vlc/vout.h>
#include "audio_output.h"
#include "aout_internal.h"

#include "visual.h"
#include <math.h>

#include "fft.h"

#define PEAK_SPEED 1

/*****************************************************************************
 * dummy_Run
 *****************************************************************************/
int dummy_Run( visual_effect_t * p_effect, aout_instance_t *p_aout,
               aout_buffer_t * p_buffer , picture_t * p_picture)
{
    return 0;
}

/*****************************************************************************
 * spectrum_Run: spectrum analyser
 *****************************************************************************/
int spectrum_Run(visual_effect_t * p_effect, aout_instance_t *p_aout,
                 aout_buffer_t * p_buffer , picture_t * p_picture)
{
    float p_output[FFT_BUFFER_SIZE];  /* Raw FFT Result  */
    int *height;                      /* Bar heights */
    int *peaks;                       /* Peaks */
    int i_nb_bands;                   /* number of bands */
    int i_band_width;                 /* width of bands */
    int i_separ;                      /* Should we let blanks ? */
    int i_amp;                        /* Vertical amplification */
    int i_peak;                       /* Should we draw peaks ? */
    char *psz_parse = NULL;           /* Args line */

    /* Horizontal scale for 20-band equalizer */
    const int xscale1[]={0,1,2,3,4,5,6,7,8,11,15,20,27,
                        36,47,62,82,107,141,184,255};

    /* Horizontal scale for 80-band equalizer */
    const int xscale2[] =
    {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,
     19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,
     35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,
     52,53,54,55,56,57,58,59,61,63,67,72,77,82,87,93,99,105,
     110,115,121,130,141,152,163,174,185,200,255};
    const int *xscale;
    const double y_scale =  3.60673760222;  /* (log 256) */

    fft_state *p_state;                 /* internal FFT data */

    int i , j , y , k;
    int i_line;
    int16_t p_dest[FFT_BUFFER_SIZE];      /* Adapted FFT result */
    int16_t p_buffer1[FFT_BUFFER_SIZE];   /* Buffer on which we perform
                                             the FFT (first channel) */

    float *p_buffl =                     /* Original buffer */
            (float*)p_buffer->p_buffer;

    int16_t  *p_buffs;                    /* int16_t converted buffer */
    int16_t  *p_s16_buff = NULL;                /* int16_t converted buffer */

    p_s16_buff = (int16_t*)malloc(
              p_buffer->i_nb_samples * p_effect->i_nb_chans * sizeof(int16_t));

    if( !p_s16_buff )
    {
        msg_Err(p_aout,"Out of memory");
        return -1;
    }

    p_buffs = p_s16_buff;
    i_nb_bands = config_GetInt ( p_aout, "visual-nbbands" );
    i_separ    = config_GetInt( p_aout, "visual-separ" );
    i_amp     = config_GetInt ( p_aout, "visual-amp" );
    i_peak     = config_GetInt ( p_aout, "visual-peaks" );

    if( i_nb_bands == 20)
    {
        xscale = xscale1;
    }
    else
    {
        i_nb_bands = 80;
        xscale = xscale2;
    }

    if( !p_effect->p_data )
    {
        p_effect->p_data=(void *)malloc(i_nb_bands * sizeof(int) );
        if( !p_effect->p_data)
        {
            msg_Err(p_aout,"Out of memory");
            return -1;
        }
        peaks = (int *)p_effect->p_data;
        for( i = 0 ; i < i_nb_bands ; i++)
        {
           peaks[i] = 0;
        }

    }
    else
    {
        peaks =(int *)p_effect->p_data;
    }


    height = (int *)malloc( i_nb_bands * sizeof(int) );
    if( !height)
    {
        msg_Err(p_aout,"Out of memory");
        return -1;
    }
    /* Convert the buffer to int16_t  */
    /* Pasted from float32tos16.c */
    for (i = p_buffer->i_nb_samples * p_effect->i_nb_chans; i--; )
    {
        union { float f; int32_t i; } u;
        u.f = *p_buffl + 384.0;
        if(u.i >  0x43c07fff ) * p_buffs = 32767;
        else if ( u.i < 0x43bf8000 ) *p_buffs = -32768;
        else *p_buffs = u.i - 0x43c00000;

        p_buffl++ ; p_buffs++ ;
    }
    p_state  = visual_fft_init();
    if( !p_state)
    {
        msg_Err(p_aout,"Unable to initialize FFT transform");
        return -1;
    }
    p_buffs = p_s16_buff;
    for ( i = 0 ; i < FFT_BUFFER_SIZE ; i++)
    {
        p_output[i]    = 0;
        p_buffer1[i] = *p_buffs;
        p_buffs      = p_buffs + p_effect->i_nb_chans;
    }
    fft_perform( p_buffer1, p_output, p_state);
    for(i= 0; i< FFT_BUFFER_SIZE ; i++ )
        p_dest[i] = ( (int) sqrt( p_output [ i + 1 ] ) ) >> 8;

    for ( i = 0 ; i< i_nb_bands ;i++)
    {
        /* We search the maximum on one scale */
        for( j = xscale[i] , y=0 ; j< xscale[ i + 1 ] ; j++ )
        {
            if ( p_dest[j] > y )
                 y = p_dest[j];
        }
        /* Calculate the height of the bar */
        y >>=7;/* remove some noise */
        if( y != 0)
        {
            height[i] = (int)log(y)* y_scale;
               if(height[i] > 150)
                  height[i] = 150;
        }
        else
        {
            height[i] = 0 ;
        }

        /* Draw the bar now */
        i_band_width = floor( p_effect->i_width / i_nb_bands) ;

        if( i_amp * height[i] > peaks[i])
        {
            peaks[i] = i_amp * height[i];
        }
        else if (peaks[i] > 0 )
        {
            peaks[i] -= PEAK_SPEED;
            if( peaks[i] < i_amp * height[i] )
            {
                peaks[i] = i_amp * height[i];
            }
            if( peaks[i] < 0 )
            {
                peaks[i] = 0;
            }
        }

        if( peaks[i] > 0 && i_peak )
        {
            if( peaks[i] >= p_effect->i_height )
                peaks[i] = p_effect->i_height - 2;
            i_line = peaks[i];

            for( j = 0 ; j< i_band_width - i_separ; j++)
            {
               for( k = 0 ; k< 3 ; k ++)
               {
                   /* Draw the peak */
                     *(p_picture->p[0].p_pixels +
                    (p_picture->p[0].i_lines - i_line -1 -k ) *
                     p_picture->p[0].i_pitch + (i_band_width*i +j) )
                                    = 0xff;

                    *(p_picture->p[1].p_pixels +
                     (p_picture->p[1].i_lines - i_line /2 -1 -k/2 ) *
                     p_picture->p[1].i_pitch +