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#! /usr/bin/python
# Test for PortAudio devices using ctypes
from __future__ import print_function
import ctypes, ctypes.util
class PaDeviceInfo (ctypes.Structure):
_fields_ = [
('structVersion', ctypes.c_int),
('name', ctypes.c_char_p),
('hostApi', ctypes.c_int), # PaHostApiIndex
('maxInputChannels', ctypes.c_int),
('maxOutputChannels', ctypes.c_int),
('defaultLowInputLatency', ctypes.c_double), # PaTime
('defaultLowOutputLatency', ctypes.c_double), # PaTime
('defaultHighInputLatency', ctypes.c_double), # PaTime
('defaultHighOutputLatency', ctypes.c_double), # PaTime
('defaultSampleRate', ctypes.c_double),
]
class PaHostApiInfo (ctypes.Structure):
_fields_ = [
('structVersion', ctypes.c_int),
('type', ctypes.c_int), # enum PaHostApiTypeId
('name', ctypes.c_char_p),
('deviceCount', ctypes.c_int),
('defaultInputDevice', ctypes.c_int),
('defaultOutputDevice', ctypes.c_int),
]
class PaStreamParameters (ctypes.Structure):
_fields_ = [
('device', ctypes.c_int), #PaDeviceIndex
('channelCount', ctypes.c_int),
('sampleFormat', ctypes.c_ulong), #PaSampleFormat
('suggestedLatency', ctypes.c_double), # PaTime
('hostApiSpecificStreamInfo', ctypes.c_void_p),
]
pa_name = ctypes.util.find_library("portaudio")
pa = ctypes.CDLL(pa_name)
pa.Pa_GetDeviceInfo.restype = ctypes.POINTER(PaDeviceInfo)
pa.Pa_GetHostApiInfo.restype = ctypes.POINTER(PaHostApiInfo)
pa.Pa_GetVersionText.restype = ctypes.c_char_p
inputParameters = PaStreamParameters (device=0, channelCount=2,
sampleFormat=2, suggestedLatency=0, # format 2 is paInt32
hostApiSpecificStreamInfo=ctypes.c_void_p() )
outputParameters = PaStreamParameters (device=0, channelCount=2,
sampleFormat=2, suggestedLatency=0, # format 2 is paInt32
hostApiSpecificStreamInfo=ctypes.c_void_p() )
print('Open', pa.Pa_Initialize())
try:
print('Version', pa.Pa_GetVersion())
print('Version Text', pa.Pa_GetVersionText())
count = pa.Pa_GetDeviceCount()
print('NumDev', count)
for i in range(count):
pt_info = pa.Pa_GetDeviceInfo(i)
info = pt_info.contents
print("Device %2d, host api %s" % (i, pa.Pa_GetHostApiInfo(info.hostApi).contents.name))
print(" Name %s" % info.name)
print(" Max inputs %d, Max outputs %d" % (info.maxInputChannels, info.maxOutputChannels))
inputParameters.device = i
outputParameters.device = i
if info.maxInputChannels >= 2:
ptIn = ctypes.pointer(inputParameters)
else:
ptIn = ctypes.c_void_p()
if info.maxOutputChannels >= 2:
ptOut = ctypes.pointer(outputParameters)
else:
ptOut = ctypes.c_void_p()
print(" Speeds for 2-channel paInt32:", end=' ')
for speed in (44100, 48000, 96000, 192000):
if pa.Pa_IsFormatSupported(ptIn, ptOut, ctypes.c_double(speed)) == 0:
print(" %d" % speed, end=' ')
print()
finally:
print('Close', pa.Pa_Terminate())
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