[solved] "audio switching" with OpenSesame

Comments

• eduard

  September 2015 edited 4:46AM

  Hi Malte,

  If there is a Python package somewhere out there that can do this operation it will most likely also work from within OpenSesame. Unfortunately, I have no clue whether it exists, or anything specific about how to tackle the problem.

  Sorry,

  Eduard

  
• malte_m

  September 2015 edited 4:46AM

  Hi Eduard,

  it's a good thing to hear that it is (generally) possible. I came across a rather convenient solution for the "present from multiple speakers"-part of the problem: Following this post, it can be easily done for mono/stereo files by adding more entries to the channel_map in PyAudio. The (slightly modified) code looks like this:

  import pyaudio
  import wave
  import sys
  
  chunk = 4096
  
  PyAudio = pyaudio.PyAudio
  
  if len(sys.argv) < 2:
  print("Plays a wave file.\n\nUsage: %s filename.wav" % sys.argv[0])
  sys.exit(-1)
  
  wf = wave.open(sys.argv[1], 'rb')
  
  p = PyAudio()
  
  channel_map = (0, 1, -1, -1, -1, -1, -1, -1)
  
  try:
  stream_info = pyaudio.PaMacCoreStreamInfo(
  flags=pyaudio.PaMacCoreStreamInfo.paMacCorePlayNice, # default
  channel_map=channel_map)
  except AttributeError:
  print("Sorry, couldn't find PaMacCoreStreamInfo. Make sure that "
  "you're running on Mac OS X.")
  sys.exit(-1)
  
  print("Stream Info Flags:", stream_info.get_flags())
  print("Stream Info Channel Map:", stream_info.get_channel_map())
  print("channels",wf.getnchannels())
  
  print('sample width',wf.getsampwidth())
  
  stream = p.open(
  format=p.get_format_from_width(wf.getsampwidth()),
  channels=wf.getnchannels(),
  rate=wf.getframerate(),
  output=True,
  output_host_api_specific_stream_info=stream_info)
  
  data = wf.readframes(chunk)
  
  while data != '':
  stream.write(data)
  data = wf.readframes(chunk)
  
  stream.stop_stream()
  stream.close()
  
  p.terminate()
  

  Is it possible to implement PyAudio in OpenSesame by manually editing the code of e.g., a sampler item? Or would that conflict with the ways sounds are played by OpenSesame?

  If it is possible, can someone provide an example of how it can be done? I don't mind digging some more into libraries/modules but providing an example for the code in question would help me (as a novice) a lot.

  Thanks again!

  Malte
• sebastiaan

  September 2015 edited 4:46AM

  Is it possible to implement PyAudio in OpenSesame by manually editing the code of e.g., a sampler item? Or would that conflict with the ways sounds are played by OpenSesame?

  Sure, you can add arbitrary Python code using the inline_script item. If you search this forum for 'pyaudio', you'll find various examples of people using pyaudio this way.

  Cheers!
  Sebastiaan

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

  September 2015 edited 4:46AM

  Hi Sebastiaan,

  thanks for the quick reply! I will try to make the modified code from PyAudio work in OpenSesame. I will share any but (hopefully positive) outcome of it in the forum.

  Thanks again!

  Malte
• vtsogli

  December 2015 edited December 2015

  Hello OpenSesameTeam,

  I m trying to implement an inline script (separate item) to play a wav file using the script that I found here http://people.csail.mit.edu/hubert/pyaudio/.
  I get an IO error in the following line:

  wf = wave.open('drip.wav', 'rb')

  (The drip.wav file is located on the same folder as my script.)

  My o/p:

  Error while executing inline script

  phase: run
  item: inline_script
  line: 159
  exception message:
  exception type: IOError

  Traceback:
  File "/Applications/OpenSesame.app/Contents/Resources/lib/python2.7/libopensesame/inline_script.py", line 173, in run
  File "/Applications/OpenSesame.app/Contents/Resources/lib/python2.7/libopensesame/python_workspace.py", line 111, in _exec
  Inline_script, line 20, in
  File "wave.pyc", line 509, in open
  File "wave.pyc", line 160, in init
  IOError: [Errno 2] No such file or directory: 'drip.wav'

  Any ideas how to resolve this issue of IOError?
  Thank you very much,
  V
• malte_m

  December 2015 edited 4:46AM

  Hi V,

  it would be help if you could provide the complete inline script that causes the error. At first glance, it seems that the file could not be retrieved. You might try to specify a path to "drip.wav".

  Cheers,

  Malte
• vtsogli

  December 2015 edited 4:46AM

  Dear Malte,
  thank you very much for your response, I resolved the issue. It is necessary to specify the absolute path of the file.
  Take care!