Class: WavSpectrumAnalyzer::FFT

Inherits:
Object
  • Object
show all
Defined in:
ext/wavspa/fft/rb_fft.c

Instance Method Summary collapse

Constructor Details

#initialize(fmt, capa) ⇒ Object 



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# File 'ext/wavspa/fft/rb_fft.c', line 45

static VALUE
rb_fft_initialize(VALUE self, VALUE fmt, VALUE capa)
{
  rb_fft_t* ptr;
  int err;

  /*
   * check argument
   */
  Check_Type(fmt, T_STRING);
  Check_Type(capa, T_FIXNUM);

  /*
   * strip object
   */
  Data_Get_Struct(self, rb_fft_t, ptr);

  /*
   * create fft context
   */
  err = fft_new(RSTRING_PTR(fmt), FIX2INT(capa), &ptr->fft);
  if (err) {
    RUNTIME_ERROR( "fft_new() failed. [err = %d]\n", err);
  }

  return Qtrue;
}

Instance Method Details

#<<(data) ⇒ Object 



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# File 'ext/wavspa/fft/rb_fft.c', line 151

static VALUE
rb_fft_enqueue(VALUE self, VALUE data)
{
  rb_fft_shift_in(self, data);
  rb_fft_transform(self);

  return self;
}

#absolute ⇒ Object 



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# File 'ext/wavspa/fft/rb_fft.c', line 406

static VALUE
rb_fft_absolute(VALUE self)
{
  rb_fft_t* ptr;
  VALUE ret;
  int err;

  /*
   * strip object
   */
  Data_Get_Struct(self, rb_fft_t, ptr);

  /*
   * alloc return object
   */
  ret = rb_str_buf_new(sizeof(double) * ptr->fft->width);
  rb_str_set_len(ret, sizeof(double) * ptr->fft->width);

  /*
   * call inverse function
   */
  err = fft_calc_absolute(ptr->fft, (double*)RSTRING_PTR(ret));
  if (err) {
    RUNTIME_ERROR( "fft_calc_absolute() failed. [err = %d]\n", err);
  }

  return ret;
}

#amplitude ⇒ Object 



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# File 'ext/wavspa/fft/rb_fft.c', line 377

static VALUE
rb_fft_amplitude(VALUE self)
{
  rb_fft_t* ptr;
  VALUE ret;
  int err;

  /*
   * strip object
   */
  Data_Get_Struct(self, rb_fft_t, ptr);

  /*
   * alloc return object
   */
  ret = rb_str_buf_new(sizeof(double) * ptr->fft->width);
  rb_str_set_len(ret, sizeof(double) * ptr->fft->width);

  /*
   * call inverse function
   */
  err = fft_calc_amplitude(ptr->fft, (double*)RSTRING_PTR(ret));
  if (err) {
    RUNTIME_ERROR( "fft_calc_amplitude() failed. [err = %d]\n", err);
  }

  return ret;
}

#enqueue(data) ⇒ Object 



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# File 'ext/wavspa/fft/rb_fft.c', line 151

static VALUE
rb_fft_enqueue(VALUE self, VALUE data)
{
  rb_fft_shift_in(self, data);
  rb_fft_transform(self);

  return self;
}

#frequency=(freq) ⇒ Object 



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# File 'ext/wavspa/fft/rb_fft.c', line 308

static VALUE
rb_fft_set_frequency(VALUE self, VALUE freq)
{
  rb_fft_t* ptr;
  int err;
  double s;
  double h;
  double l;

  /*
   * check argument
   */
  Check_Type(freq, T_ARRAY);
  if (RARRAY_LEN(freq) != 3) {
    ARGUMENT_ERROR("frequency set shall be 3 entries contain.");
  }

  /*
   * strip object
   */
  Data_Get_Struct(self, rb_fft_t, ptr);

  /*
   * call set fequency
   */
  s   = NUM2DBL(RARRAY_AREF(freq, 0));
  l   = NUM2DBL(RARRAY_AREF(freq, 1));
  h   = NUM2DBL(RARRAY_AREF(freq, 2));
  err = fft_set_frequency(ptr->fft, s, l, h);
  if (err) {
    RUNTIME_ERROR( "fft_set_frequency() failed. [err = %d]\n", err);
  }

  return freq;
}

#power ⇒ Object 



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# File 'ext/wavspa/fft/rb_fft.c', line 345

static VALUE
rb_fft_power(VALUE self)
{
  rb_fft_t* ptr;
  VALUE ret;
  int err;
  int i;
  double* dat;

  /*
   * strip object
   */
  Data_Get_Struct(self, rb_fft_t, ptr);

  /*
   * alloc return object
   */
  ret = rb_str_buf_new(sizeof(double) * ptr->fft->width);
  rb_str_set_len(ret, sizeof(double) * ptr->fft->width);

  /*
   * call transform function
   */
  dat = RSTRING_PTR(ret);
  err = fft_calc_power(ptr->fft, dat);
  if (err) {
    RUNTIME_ERROR( "fft_calc_power() failed. [err = %d]\n", err);
  }

  return ret;
}

#reset ⇒ Object 



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# File 'ext/wavspa/fft/rb_fft.c', line 106

static VALUE
rb_fft_reset(VALUE self)
{
  rb_fft_t* ptr;
  int err;

  /*
   * strip object
   */
  Data_Get_Struct(self, rb_fft_t, ptr);

  /*
   * call fft library
   */
  err = fft_reset(ptr->fft);

  if (err) {
    RUNTIME_ERROR( "fft_reset() failed. [err = %d]\n", err);
  }

  return self;
}

#scale_mode ⇒ Object 



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# File 'ext/wavspa/fft/rb_fft.c', line 248

static VALUE
rb_fft_get_scale_mode(VALUE self)
{
  VALUE ret;
  rb_fft_t* ptr;

  Data_Get_Struct(self, rb_fft_t, ptr);

  switch (ptr->fft->mode) {
  case FFT_LOGSCALE_MODE:
    ret = ID2SYM(rb_intern("LOGSCALE"));
    break;

  case FFT_LINEARSCALE_MODE:
    ret = ID2SYM(rb_intern("LINEARSCALE"));
    break;

  default:
    RUNTIME_ERROR( "Really?");
  }

  return ret;
}

#scale_mode=(_mode) ⇒ Object 



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# File 'ext/wavspa/fft/rb_fft.c', line 272

static VALUE
rb_fft_set_scale_mode(VALUE self, VALUE _mode)
{
  rb_fft_t* ptr;
  int err;
  int mode;

  /*
   * check argument
   */
  if (EQ_STR(_mode, "LOGSCALE") || EQ_STR(_mode, "LOG")) {
    mode = FFT_LOGSCALE_MODE;

  } else if (EQ_STR(_mode, "LINEARSCALE") || EQ_STR(_mode, "LINEAR")) {
    mode = FFT_LINEARSCALE_MODE;

  } else {
    ARGUMENT_ERROR("not supported value");
  }

  /*
   * strip object
   */
  Data_Get_Struct(self, rb_fft_t, ptr);

  /*
   * call set scale mode function
   */
  err = fft_set_scale_mode(ptr->fft, mode);
  if (err) {
    RUNTIME_ERROR( "fft_set_scale_mode() failed. [err = %d]\n", err);
  }

  return _mode;
}

#shift_in(data) ⇒ Object 



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# File 'ext/wavspa/fft/rb_fft.c', line 73

static VALUE
rb_fft_shift_in(VALUE self, VALUE data)
{
  rb_fft_t* ptr;
  int err;
  void* src;
  int n;

  /*
   * check argument
   */
  Check_Type(data, T_STRING);

  /*
   * strip object
   */
  Data_Get_Struct(self, rb_fft_t, ptr);

  /*
   * call fft library
   */

  src = RSTRING_PTR(data);
  n   = RSTRING_LEN(data) / (ptr->fft->fmt & 0x000f);

  err = fft_shift_in(ptr->fft, src, n);
  if (err) {
    RUNTIME_ERROR( "fft_shift_in() failed. [err = %d]\n", err);
  }

  return self;
}

#transform ⇒ Object 



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# File 'ext/wavspa/fft/rb_fft.c', line 129

static VALUE
rb_fft_transform(VALUE self)
{
  rb_fft_t* ptr;
  int err;

  /*
   * strip object
   */
  Data_Get_Struct(self, rb_fft_t, ptr);

  /*
   * call transform function
   */
  err = fft_transform(ptr->fft);
  if (err) {
    RUNTIME_ERROR( "fft_transform() failed. [err = %d]\n", err);
  }

  return self;
}

#width ⇒ Object 



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# File 'ext/wavspa/fft/rb_fft.c', line 211

static VALUE
rb_fft_get_width(VALUE self)
{
  rb_fft_t* ptr;

  Data_Get_Struct(self, rb_fft_t, ptr);

  return INT2FIX(ptr->fft->width);
}

#width=(width) ⇒ Object 



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# File 'ext/wavspa/fft/rb_fft.c', line 221

static VALUE
rb_fft_set_width(VALUE self, VALUE width)
{
  rb_fft_t* ptr;
  int err;

  /*
   * check argument
   */
  Check_Type(width, T_FIXNUM);

  /*
   * strip object
   */
  Data_Get_Struct(self, rb_fft_t, ptr);

  /*
   * call set window
   */
  err = fft_set_width(ptr->fft, FIX2INT(width));
  if (err) {
    RUNTIME_ERROR( "fft_set_width() failed. [err = %d]\n", err);
  }

  return width;
}

#window=(_type) ⇒ Object 



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# File 'ext/wavspa/fft/rb_fft.c', line 160

static VALUE
rb_fft_set_window(VALUE self, VALUE _type)
{
  rb_fft_t* ptr;
  int type;
  int err;

  /*
   * check argument
   */
  if (TYPE(_type) != T_STRING && TYPE(_type) != T_SYMBOL) {
    RUNTIME_ERROR( "Window type is unsupported data");

  } else if (EQ_STR(_type, "RECTANGULAR")) {
    type = FFT_WINDOW_RECTANGULAR;

  } else if (EQ_STR(_type, "HAMMING")) {
    type = FFT_WINDOW_HAMMING;

  } else if (EQ_STR(_type, "HANN")) {
    type = FFT_WINDOW_HANN;

  } else if (EQ_STR(_type, "BLACKMAN")) {
    type = FFT_WINDOW_BLACKMAN;

  } else if (EQ_STR(_type, "BLACKMAN_NUTTALL")) {
    type = FFT_WINDOW_BLACKMAN_NUTTALL;

  } else if (EQ_STR(_type, "FLAT_TOP")) {
    type = FFT_WINDOW_FLAT_TOP;

  } else {
    RUNTIME_ERROR( "Unknown window type");
  }

  /*
   * strip object
   */
  Data_Get_Struct(self, rb_fft_t, ptr);

  /*
   * call set window
   */
  err = fft_set_window(ptr->fft, type);
  if (err) {
    RUNTIME_ERROR( "fft_set_window() failed. [err = %d]\n", err);
  }

  return _type;
}