[solved] Record audio response with variable time span

Comments

• sebastiaan

  January 2014 edited 8:30AM

  Hi Njord,

  A little bit down in the same discussion that you're referring to, you will find a little code snippet that you can use to stop recording when a key is pressed. It sounds like this is exactly what you're looking for:

  • http://forum.cogsci.nl/index.php?p=/discussion/comment/611#Comment_611

  Cheers!
  Sebastiaan

  
  
  Check out SigmundAI.eu for our OpenSesame AI assistant!
  
• solbero

  January 2014 edited January 2014

  Thank you very much for your help, Sebastiaan.

  I got the script working and it is recording .wav files without a hitch, but I ran into another problem.

  In the folder in which my OpenSesame experiment is saved, I want to create a sub-folder named after the "Participant ID". All the recorded sound files from one participant will then be saved in this folder.

  In the script, I have these statements accomplishing this task:

  SUBDIR = "./%d/" % self.get('subject_nr')
  os.makedirs(SUBDIR)
  WAVE_OUTPUT_FILENAME = "%d_%d.wav" % (self.get('subject_nr'),
  self.get('count_inline_script'))
  wf = wave.open( "./" + SUBDIR + WAVE_OUTPUT_FILENAME, 'wb')
  

  This works well, except that the sub-directory is created in my $HOME folder on Ubuntu, and not in the folder where the experiment resides.

  I know that this could easily be solved by specifying absolute paths, but I am going to move the experiment to a lab computer when it is finished. Therefore I want to use variable paths, so that I don't have to go back and change all the paths.

  Do you know, or somebody else, how this can be accomplished?

  • Njord
• lvanderlinden

  January 2014 edited 8:30AM

  Hi Njord,

  You could determine the path of the directory in which your OpenSesame is placed by using the following piece of Python inline code:

  currentPath = self.get('experiment_path')
  

  Does that help?

  Cheers,

  Lotje

  Did you like my answer? Feel free to
• solbero

  January 2014 edited 8:30AM

  lvanderlinden, that was just the piece of code I needed.
• solbero

  February 2014 edited February 2014

  I though I would share my finished inline script so that others that might have a similar problem can use and modify it to their needs.

  I am using this script to collect open-ended responses to a stimulus. When the participant is done giving their response and press the space bar, the experiment continues. But I also wanted to insert a time out, so that if one participant doesn't press the key, falls asleep, is uncooperative, the experiment will not halt at this part.

  It has to be inserted into an inline_script to work.

  """ Record a pre-defined amout of audio  and save to a WAVE file. """
  
  import pyaudio
  import wave
  from openexp.keyboard import keyboard
  
  # Name of sub-directory where WAVE files are placed
  current_experiment_path = self.get('experiment_path')
  subdir_recording = '/recording/'
  
  # Variables for Pyaudio
  chunk = 1024
  format = pyaudio.paInt16
  channels = 1
  rate = 44100
  
  # Set variable for the labelling of the recorded WAVE file.
  wave_output_filename = '%s.wav' % self.get('subject_nr')
  
  #Audio recording stuff
  p = pyaudio.PyAudio()
  
  stream = p.open(format = format,
                  channels = channels,
                  rate = rate,
                  input = True,
                  frames_per_buffer = chunk)
  
  # Import keyboard and set accepted key
  recorder_keyboard = keyboard(exp, keylist=['space'])
  
  # Determine the timeout in ms
  timeout = 60000
  
  # Create an empty list for audio recording
  frames = []
  
  # Determine the timestamp of the start of the response interval
  start_time = self.time()
  current_time = self.time()
  
  # Record audio until space is pressed
  while (current_time - start_time) < timeout:
  
      # Record data audio data
      data = stream.read(chunk)
      # Add the data to a buffer (a list of chunks)
      frames.append(data)
  
      # Get new timestamp
      current_time = self.time()
  
      # Check if space key has been pressed
      key = recorder_keyboard.get_key(timeout=0)[0]
  
      # If space is pressed, advance to next part of the experiment
      if key == 'space':
          # Record data audio data
          data = stream.read(chunk)
          # Add the data to a buffer (a list of chunks)
          frames.append(data)
          break
  
  else:
      # Record data audio data
      data = stream.read(chunk)
      # Add the data to a buffer (a list of chunks)
      frames.append(data)
  
  # Close the audio recording stream
  stream.close()
  p.terminate()
  
  # write data to WAVE file
  wf = wave.open(current_experiment_path + subdir_recording + wave_output_filename, 'wb')
  wf.setnchannels(channels)
  wf.setsampwidth(p.get_sample_size(format))
  wf.setframerate(rate)
  wf.writeframes(''.join(frames))
  wf.close()