Prevent acqusition when audio sample rate is less than 44.1 kHz

Source/Processors/FileReader/FileReader.cpp

@@ -51,7 +51,8 @@ FileReader::FileReader() : GenericProcessor ("File Reader"),
  m_sysSampleRate (44100),
  playbackActive (true),
  gotNewFile (true),
- loopPlayback (true)
+ loopPlayback (true),
+ sampleRateWarningShown (false)
 {
  /* Add built-in file source (Binary Format) */
  supportedExtensions.set ("oebin", 1);
@@ -500,8 +501,32 @@ void FileReader::updateSettings()
  adm.getAudioDeviceSetup (ads);
  m_sysSampleRate = ads.sampleRate;
  m_bufferSize = ads.bufferSize;
+
+ if (m_sysSampleRate < 44100.0)
+ {
+ if (! sampleRateWarningShown)
+ {
+ LOGE ("File Reader: Sample rate is less than 44100 Hz. Disabling processor.");
+
+ if (! headlessMode)
+ {
+ AlertWindow::showMessageBox (AlertWindow::WarningIcon,
+ "[File Reader] Invalid Sample Rate",
+ "The sample rate of the audio device is less than 44.1 kHz. File Reader is disabled."
+ "\n\nTry adjusting the sample rate in the audio settings by clicking the 'Latency' button in the Control Panel "
+ "and setting it to 44.1 kHz or higher. After making this change, please remove and re-add the File Reader to the signal chain.");
+ }
+
+ sampleRateWarningShown = true;
+ }
+
+ isEnabled = false;
+ return;
+ }
+
  if (m_bufferSize == 0)
  m_bufferSize = 1024;
+
  m_samplesPerBuffer.set (m_bufferSize * (getDefaultSampleRate() / m_sysSampleRate));
 
  bufferA.malloc (currentNumChannels * m_bufferSize * BUFFER_WINDOW_CACHE_SIZE);
@@ -602,7 +627,7 @@ void FileReader::process (AudioBuffer<float>& buffer)
 
  if (! playbackActive && playbackSamplePos + samplesNeededPerBuffer > stopSample)
  {
- samplesNeededPerBuffer = int(stopSample - playbackSamplePos);
+ samplesNeededPerBuffer = int (stopSample - playbackSamplePos);
  switchNeeded = true;
  }
  else
@@ -745,7 +770,7 @@ void FileReader::readAndFillBufferCache (HeapBlock<float>& cacheBuffer)
  // if reached end of file stream
  if ((currentSample + samplesToRead) > stopSample)
  {
- samplesToRead = int(stopSample - currentSample);
+ samplesToRead = int (stopSample - currentSample);
  if (samplesToRead > 0)
  input->readData (cacheBuffer + samplesRead * currentNumChannels, samplesToRead);
 

Source/Processors/FileReader/FileReader.h

@@ -186,6 +186,9 @@ class FileReader : public GenericProcessor,
  /** Flag if a new file has been loaded */
  bool gotNewFile;
 
+ /** Flag if the invalid sample rate warning is shown */
+ bool sampleRateWarningShown;
+
  /** Total number of samples played back since most recent start of acquisition */
  int64 playbackSamplePos;
 

Source/UI/ControlPanel.cpp

@@ -569,6 +569,29 @@ void ControlPanel::startAcquisition (bool recordingShouldAlsoStart)
  return;
  }
 
+
+ if (audio->getSampleRate() < 44100)
+ {
+ playButton->setToggleState (false, dontSendNotification);
+ recordButton->setToggleState (false, dontSendNotification);
+
+ String errorMsg = "Sample rate too low. Unable to start acquisition!";
+ LOGE (errorMsg);
+
+ if (! isConsoleApp)
+ {
+ errorMsg += "\n\nThe sample rate must be at least 44.1 kHz to process data. "
+ "Try changing the sample rate in the audio configuration window (click on the \"Latency\" button in the Control Panel) "
+ "to a value of 44.1 kHz or higher. If no such option is available, try changing the output device type.";
+
+ AlertWindow::showMessageBox (AlertWindow::WarningIcon,
+ "Acquisition Error!",
+ errorMsg);
+ }
+
+ return;
+ }
+
  if (! isConsoleApp && audioEditor->isAudioConfigurationWindowVisible())
  {
  audioEditor->disable();