86 lines
2.8 KiB
Python
Executable File
86 lines
2.8 KiB
Python
Executable File
#! /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())
|