Exception calling engine.make_playback_processor with mono samples

[skirmishthered]

I've only just started playing with DawDreamer so I am almost certainly missing something very basic, but I'm hitting an exception trying to create a playback processor with a mono wave. I've reproduced it with one of the built-in Windows dings.

BTW DawDreamer looks awesome, thanks for you work @DBraun

import dawdreamer
import librosa
from scipy.io import wavfile

SAMPLE_RATE = 44100
BUFFER_SIZE = 512

def load_audio_file( file_path, duration=None ):
  sig, rate = librosa.load( file_path, duration=duration, mono=False, sr=SAMPLE_RATE )
  assert( rate == SAMPLE_RATE )
  return sig

engine = dawdreamer.RenderEngine( SAMPLE_RATE, BUFFER_SIZE )

windows_uac_beep_wav_path = r"C:\Windows\Media\Windows User Account Control.wav"
windows_uac_beep_stereo = load_audio_file( windows_uac_beep_wav_path )
# This works
stereo_playback_processor = engine.make_playback_processor( "stereo_playback", windows_uac_beep_stereo )
windows_uac_beep_mono = librosa.to_mono(windows_uac_beep_stereo)
# This raises IndexError 'invalid axis: 1 (ndim = 1)'
mono_playback_processor = engine.make_playback_processor( "mono_playback", windows_uac_beep_mono )

[DBraun]

The audio data must be shaped 2D (num channels, num samples). So (1, num samples) is ok but (num samples) by itself won’t work. You can use numpy expand_dims to add the new dimension. Let me know if that helps out. I’m away from my computer at the moment.

[skirmishthered]

Brilliant, that was it! Thank you.