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