Class: Mpg123

Inherits:
Object
  • Object
show all
Defined in:
ext/mpg123/mpg123.c

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.new(filename) ⇒ Object 


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# File 'ext/mpg123/mpg123.c', line 15

VALUE rb_mpg123_new(VALUE klass, VALUE filename) {
  int err = MPG123_OK;
  mpg123_handle *mh;
  VALUE mpg123;
  long rate;
  int channels, encoding;

  Check_Type(filename, T_STRING);

  if ((mh = mpg123_new(NULL, &err)) == NULL) {
    rb_raise(rb_eStandardError, "%s", mpg123_plain_strerror(err));
  }

  mpg123_param(mh, MPG123_ADD_FLAGS, MPG123_FORCE_FLOAT, 0.);

  if (mpg123_open(mh, (char*) RSTRING_PTR(filename)) != MPG123_OK ||
      mpg123_getformat(mh, &rate, &channels, &encoding) != MPG123_OK) {
    rb_raise(rb_eStandardError, "%s", mpg123_strerror(mh));
  }

  if (encoding != MPG123_ENC_FLOAT_32) {
    rb_raise(rb_eStandardError, "bad encoding");
  }

  mpg123_format_none(mh);
  mpg123_format(mh, rate, channels, encoding);

  return Data_Wrap_Struct(rb_cMpg123, 0, cleanup, mh);
}

Instance Method Details

#close ⇒ Object 


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# File 'ext/mpg123/mpg123.c', line 45

VALUE rb_mpg123_close(VALUE self)
{
  mpg123_close(DATA_PTR(self));
  return self;
}

#length ⇒ Object 


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# File 'ext/mpg123/mpg123.c', line 78

VALUE rb_mpg123_length(VALUE self)
{
  return INT2FIX(mpg123_length(DATA_PTR(self)));
}

#read(_size) ⇒ Object 


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# File 'ext/mpg123/mpg123.c', line 52

VALUE rb_mpg123_read(VALUE self, VALUE _size)
{
  int size = FIX2INT(_size);
  float *buffer = malloc(size * sizeof(float));
  VALUE result = rb_ary_new2(size);
  mpg123_handle *mh = NULL;
  size_t done = 0;
  int i;
  int err = MPG123_OK;

  Data_Get_Struct(self, mpg123_handle, mh);
  err = mpg123_read(mh, (unsigned char *) buffer, size * sizeof(float), &done);

  if (err == MPG123_OK || err == MPG123_DONE) {
    for (i = 0; i < size; i++) {
      rb_ary_store(result, i, rb_float_new(buffer[i]));
    }
    free(buffer);
    return result;
  }
  else {
    free(buffer);
    rb_raise(rb_eStandardError, "%s", mpg123_plain_strerror(err));
  }
}

#seek(offset) ⇒ Object 


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# File 'ext/mpg123/mpg123.c', line 103

VALUE rb_mpg123_seek(VALUE self, VALUE offset)
{
  return INT2FIX(mpg123_seek(DATA_PTR(self), FIX2INT(offset), SEEK_SET));
}

#seek_frame(offset) ⇒ Object 


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# File 'ext/mpg123/mpg123.c', line 108

VALUE rb_mpg123_seek_frame(VALUE self, VALUE offset)
{
  return INT2FIX(mpg123_seek_frame(DATA_PTR(self), FIX2INT(offset), SEEK_SET));
}

#spf ⇒ Object 


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# File 'ext/mpg123/mpg123.c', line 83

VALUE rb_mpg123_spf(VALUE self)
{
  return rb_float_new(mpg123_spf(DATA_PTR(self)));
}

#tell ⇒ Object 


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# File 'ext/mpg123/mpg123.c', line 93

VALUE rb_mpg123_tell(VALUE self)
{
  return INT2FIX(mpg123_tell(DATA_PTR(self)));
}

#tellframe ⇒ Object 


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# File 'ext/mpg123/mpg123.c', line 98

VALUE rb_mpg123_tellframe(VALUE self)
{
  return INT2FIX(mpg123_tellframe(DATA_PTR(self)));
}

#timeframe(seconds) ⇒ Object 


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# File 'ext/mpg123/mpg123.c', line 113

VALUE rb_mpg123_timeframe(VALUE self, VALUE seconds)
{
  return INT2FIX(mpg123_timeframe(DATA_PTR(self), NUM2DBL(seconds)));
}

#tpf ⇒ Object 


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# File 'ext/mpg123/mpg123.c', line 88

VALUE rb_mpg123_tpf(VALUE self)
{
  return rb_float_new(mpg123_tpf(DATA_PTR(self)));
}