Logo Search packages:      
Sourcecode: galan version File versions  Download package

ifft.c

/* gAlan - Graphical Audio Language
 * Copyright (C) 1999 Tony Garnock-Jones
 *
 * 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  02111-1307  USA
 */

#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <stddef.h>

#include <gdk/gdk.h>
#include <gtk/gtk.h>

#include "global.h"
#include "generator.h"
#include "comp.h"
#include "control.h"
#include "gencomp.h"

#if FFTW_PREFIX == 1
#include <drfftw.h>
#else
#include <rfftw.h>
#endif

#define GENERATOR_CLASS_NAME  "ifftw"
#define GENERATOR_CLASS_PATH  "Misc/IFFT"

#define SIG_INPUT       0
#define SIG_OUTPUT            0

#define EVT_INPUT       0
#define NUM_EVENT_INPUTS      1

#define EVT_OUTPUT            0
#define NUM_EVENT_OUTPUTS     1

typedef struct Data {
    rfftw_plan plan;
    int lastN;
} Data;

PRIVATE int init_instance(Generator *g) {
  Data *data = safe_malloc(sizeof(Data));
  g->data = data;

  data->lastN = 0;
  data->plan = NULL;
  return 1;
}

PRIVATE void destroy_instance(Generator *g) {

    Data *data = g->data;
    
    if( data->plan )
      rfftw_destroy_plan( data->plan );

    free(data);
}

PRIVATE void unpickle_instance(Generator *g, ObjectStoreItem *item, ObjectStore *db) {
  Data *data = safe_malloc(sizeof(Data));

  g->data = data;

  data->lastN = 0;
  data->plan = NULL;
}

PRIVATE void pickle_instance(Generator *g, ObjectStoreItem *item, ObjectStore *db) {
  //Data *data = g->data;
}

PRIVATE void evt_input_handler(Generator *g, AEvent *event) {
  Data *data = g->data;
  fftw_real *out;
  AEvent send_ev;

  RETURN_UNLESS( event->kind == AE_DBLARRAY );
  //RETURN_UNLESS( (event->d.array.len & 1) == 0 );

  if( event->d.array.len != data->lastN ) {

      data->lastN = event->d.array.len;

      if( data->plan )
        rfftw_destroy_plan( data->plan );

      data->plan = rfftw_create_plan( data->lastN, FFTW_COMPLEX_TO_REAL ,FFTW_ESTIMATE );
  }

  // TODO: make this alloca...
  out = safe_malloc( sizeof( fftw_real ) * data->lastN );
  
  rfftw_one( data->plan, event->d.darray.numbers, out );
  

  gen_init_aevent(&send_ev, AE_DBLARRAY, NULL, 0, NULL, 0, event->time);
  
  send_ev.d.darray.len = data->lastN;
  send_ev.d.darray.numbers = out;


  gen_send_events(g, EVT_OUTPUT, -1, &send_ev);

  free(out);
}

PRIVATE ControlDescriptor controls[] = {
  /* { kind, name, min,max,step,page, size,editable, is_dst,queue_number,
       init,destroy,refresh,refresh_data }, */
  { CONTROL_KIND_NONE, },
};

PRIVATE void setup_class(void) {
  GeneratorClass *k = gen_new_generatorclass(GENERATOR_CLASS_NAME, FALSE,
                                   NUM_EVENT_INPUTS, NUM_EVENT_OUTPUTS,
                                   NULL, NULL, controls,
                                   init_instance, destroy_instance,
                                   unpickle_instance, pickle_instance);

  gen_configure_event_input(k, EVT_INPUT, "Input", evt_input_handler);
  gen_configure_event_output(k, EVT_OUTPUT, "Output" );

  gencomp_register_generatorclass(k, FALSE, GENERATOR_CLASS_PATH, NULL, NULL);
}

PUBLIC void init_plugin_ifft(void) {
  setup_class();
}

Generated by  Doxygen 1.6.0   Back to index