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"""PyAudio Example: macOS-only: Play a wave file with channel maps."""
import wave
import sys
import pyaudio
CHUNK = 1024
if len(sys.argv) < 2:
print(f'Plays a wave file. Usage: {sys.argv[0]} filename.wav')
sys.exit(-1)
# standard L-R stereo
# channel_map = (0, 1)
# reverse: R-L stereo
# channel_map = (1, 0)
# no audio
# channel_map = (-1, -1)
# left channel audio --> left speaker; no right channel
# channel_map = (0, -1)
# right channel audio --> right speaker; no left channel
# channel_map = (-1, 1)
# left channel audio --> right speaker
# channel_map = (-1, 0)
# right channel audio --> left speaker
channel_map = (1, -1)
# etc...
try:
stream_info = pyaudio.PaMacCoreStreamInfo(
flags=pyaudio.PaMacCoreStreamInfo.paMacCorePlayNice,
channel_map=channel_map)
except AttributeError:
print(
'Could not find PaMacCoreStreamInfo. Ensure you are running on macOS.')
sys.exit(-1)
print('Stream Info Flags:', stream_info.flags)
print('Stream Info Channel Map:', stream_info.channel_map)
with wave.open(sys.argv[1], 'rb') as wf:
p = pyaudio.PyAudio()
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)
# Play stream
while len(data := wf.readframes(CHUNK)): # Requires Python 3.8+ for :=
stream.write(data)
stream.close()
p.terminate()
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