Class: Portaudio

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

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.new(framesPerBuffer, deviceName) ⇒ Object 



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# File 'ext/portaudio/portaudio.c', line 56

VALUE rb_portaudio_new(VALUE klass, VALUE framesPerBuffer, VALUE deviceName)
{
  PaStreamParameters outputParameters;
  const PaDeviceInfo *deviceInfo;
  PaError err;
  int device, numDevices, foundDevice = -1;
  VALUE self;
  Portaudio *portaudio = (Portaudio *) malloc(sizeof(Portaudio));

  pthread_mutex_init(&portaudio->mutex, NULL);
  pthread_cond_init(&portaudio->cond, NULL);

  portaudio->size = FIX2INT(framesPerBuffer) * 2;
  portaudio->buffer = (float *) malloc(sizeof(float) * portaudio->size);
  numDevices = Pa_GetDeviceCount();
  if( numDevices < 0 ) {
    printf( "ERROR: Pa_CountDevices returned 0x%x\n", numDevices );
    err = numDevices;
  }

  for ( device=0; device<numDevices; device++ ) {
    deviceInfo = Pa_GetDeviceInfo( device );
    if (strcmp(deviceInfo->name, StringValueCStr(deviceName)) == 0) {
      foundDevice = device;
      break;
    }
  }

  if (foundDevice == -1) {
    err = Pa_OpenDefaultStream(&portaudio->stream,
        0,           /* no input channels */
        2,           /* stereo output */
        paFloat32,   /* 32 bit floating point output */
        44100,       /* sample rate*/
        FIX2INT(framesPerBuffer),
        paCallback,
        (void*) portaudio);
  } else {
    bzero( &outputParameters, sizeof( outputParameters ) );
    outputParameters.device = foundDevice;
    outputParameters.channelCount = 2;
    outputParameters.sampleFormat = paFloat32;
    outputParameters.suggestedLatency = Pa_GetDeviceInfo(foundDevice)->defaultLowOutputLatency ;

    err = Pa_OpenStream(&portaudio->stream,
        NULL,
        &outputParameters,
        44100,
        FIX2INT(framesPerBuffer),
        paNoFlag,
        paCallback,
        (void*) portaudio);
  }

  if (err != paNoError) {
    rb_raise(rb_eStandardError, "%s", Pa_GetErrorText(err));
  }

  self = Data_Wrap_Struct(rb_cPortaudio, 0, free_portaudio, portaudio);

  return self;
}

Instance Method Details

#close ⇒ Object 



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# File 'ext/portaudio/portaudio.c', line 250

VALUE rb_portaudio_close(VALUE self)
{
  Portaudio *portaudio;
  Data_Get_Struct(self, Portaudio, portaudio);
  int err = Pa_CloseStream(portaudio->stream);

  pthread_cond_broadcast(&portaudio->cond);

  if (err != paNoError) {
    rb_raise(rb_eStandardError, "%s", Pa_GetErrorText(err));
  }

  return self;
}

#rms ⇒ Object 



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# File 'ext/portaudio/portaudio.c', line 198

VALUE rb_portaudio_rms(VALUE self)
{
  Portaudio *portaudio;
  Data_Get_Struct(self, Portaudio, portaudio);
  return rb_float_new(portaudio->rms);
}

#start ⇒ Object 



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# File 'ext/portaudio/portaudio.c', line 205

VALUE rb_portaudio_start(VALUE self)
{
  Portaudio *portaudio;
  Data_Get_Struct(self, Portaudio, portaudio);
  int err = Pa_StartStream(portaudio->stream);

  pthread_cond_broadcast(&portaudio->cond);

  if (err != paNoError) {
    rb_raise(rb_eStandardError, "%s", Pa_GetErrorText(err));
  }

  return self;
}

#stop ⇒ Object 



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# File 'ext/portaudio/portaudio.c', line 220

VALUE rb_portaudio_stop(VALUE self)
{
  Portaudio *portaudio;
  Data_Get_Struct(self, Portaudio, portaudio);
  int err = Pa_StopStream(portaudio->stream);

  pthread_cond_broadcast(&portaudio->cond);

  if (err != paNoError) {
    rb_raise(rb_eStandardError, "%s", Pa_GetErrorText(err));
  }

  return self;
}

#stopped? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'ext/portaudio/portaudio.c', line 235

VALUE rb_portaudio_stream_stopped(VALUE self)
{
  Portaudio *portaudio;
  Data_Get_Struct(self, Portaudio, portaudio);
  int err = Pa_IsStreamStopped(portaudio->stream);

  if (err == 1) {
    return Qtrue;
  } else if (err == 0) {
    return Qfalse;
  }

  rb_raise(rb_eStandardError, "%s", Pa_GetErrorText(err));
}

#wait ⇒ Object 



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# File 'ext/portaudio/portaudio.c', line 164

VALUE rb_portaudio_wait(VALUE self)
{
  Portaudio *portaudio;
  Data_Get_Struct(self, Portaudio, portaudio);

#ifdef RUBY_UBF_IO
  rb_thread_call_without_gvl(portaudio_wait, portaudio, RUBY_UBF_IO, NULL);
#else
  portaudio_wait(portaudio);
#endif
  return self;
}

#write(buffer) ⇒ Object 



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# File 'ext/portaudio/portaudio.c', line 177

VALUE rb_portaudio_write(VALUE self, VALUE buffer)
{
  int i, len;
  Portaudio *portaudio;
  Data_Get_Struct(self, Portaudio, portaudio);

  Check_Type(buffer, T_ARRAY);

  len = RARRAY_LEN(buffer);

  if (len != portaudio->size) {
    rb_raise(rb_eStandardError, "array length does not match buffer size: %d != %d", len, portaudio->size);
  }

  for (i = 0; i < len; i++) {
    portaudio->buffer[i] = NUM2DBL(rb_ary_entry(buffer, i));
  }

  return self;
}

#write_from_mpg(mpg) ⇒ Object 



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# File 'ext/portaudio/portaudio.c', line 141

VALUE rb_portaudio_write_from_mpg(VALUE self, VALUE mpg)
{
  int err;
  size_t done = 0;
  Portaudio *portaudio;
  mpg123_handle *mh = NULL;

  Data_Get_Struct(self, Portaudio, portaudio);
  Data_Get_Struct(mpg, mpg123_handle, mh);

  err = mpg123_read(mh, (unsigned char *) portaudio->buffer, portaudio->size * sizeof(float), &done);

  portaudio->rms = rms(portaudio->buffer, portaudio->size);

  switch (err) {
    case MPG123_OK: return ID2SYM(rb_intern("ok"));
    case MPG123_DONE: return ID2SYM(rb_intern("done"));
    case MPG123_NEED_MORE: return ID2SYM(rb_intern("need_more"));
  }

  rb_raise(rb_eStandardError, "%s", mpg123_plain_strerror(err));
}