"""
PyAudio Example:

Query and print PortAudio HostAPIs, Devices, and their
support rates.
"""

import pyaudio

standard_sample_rates = [8000.0, 9600.0, 11025.0, 12000.0,
                         16000.0, 22050.0, 24000.0, 32000.0,
                         44100.0, 48000.0, 88200.0, 96000.0,
                         192000.0]

p = pyaudio.PyAudio()
max_apis = p.get_host_api_count()
max_devs = p.get_device_count()

print("\nPortAudio System Info:\n======================")
print("Version: %d" % pyaudio.get_portaudio_version())
print("Version Text: %s" % pyaudio.get_portaudio_version_text())
print("Number of Host APIs: %d" % max_apis)
print("Number of Devices  : %d" % max_devs)

print("\nHost APIs:\n==========")

for i in range(max_apis):
    apiinfo = p.get_host_api_info_by_index(i)
    for k in list(apiinfo.items()):
        print("%s: %s" % k)
    print("--------------------------")

print("\nDevices:\n========")

for i in range(max_devs):
    devinfo = p.get_device_info_by_index(i)

    # print out device parameters
    for k in list(devinfo.items()):
        name, value = k

        # if host API, then get friendly name

        if name == 'hostApi':
            value = str(value) + \
                    " (%s)" % p.get_host_api_info_by_index(k[1])['name']

        # Crashing?  See http://stackoverflow.com/a/5146914
        print("\t%s: %s" % (name, value))

    # print out supported format rates

    input_supported_rates = []
    output_supported_rates = []
    full_duplex_rates = []

    for f in standard_sample_rates:

        if devinfo['maxInputChannels'] > 0:
            try:
                if p.is_format_supported(
                    f,
                    input_device = devinfo['index'],
                    input_channels = devinfo['maxInputChannels'],
                    input_format = pyaudio.paInt16):
                    input_supported_rates.append(f)
            except ValueError:
                pass

        if devinfo['maxOutputChannels'] > 0:
            try:
                if p.is_format_supported(
                    f,
                    output_device = devinfo['index'],
                    output_channels = devinfo['maxOutputChannels'],
                    output_format = pyaudio.paInt16):
                    output_supported_rates.append(f)
            except ValueError:
                pass

        if (devinfo['maxInputChannels'] > 0) and \
           (devinfo['maxOutputChannels'] > 0):
            try:
                if p.is_format_supported(
                    f,
                    input_device = devinfo['index'],
                    input_channels = devinfo['maxInputChannels'],
                    input_format = pyaudio.paInt16,
                    output_device = devinfo['index'],
                    output_channels = devinfo['maxOutputChannels'],
                    output_format = pyaudio.paInt16):
                    full_duplex_rates.append(f)
            except ValueError:
                pass

    if len(input_supported_rates):
        print("\tInput rates: %s" % input_supported_rates)
    if len(output_supported_rates):
        print("\tOutput rates: %s" % output_supported_rates)
    if len(full_duplex_rates):
        print("\tFull duplex: %s" % full_duplex_rates)

    print("\t--------------------------------")

print("\nDefault Devices:\n================")
try:
    def_index = p.get_default_input_device_info()['index']
    print("Default Input Device : %s" % def_index)
    devinfo = p.get_device_info_by_index(def_index)
    for k in list(devinfo.items()):
        name, value = k
        if name == 'hostApi':
            value = str(value) + \
                    " (%s)" % p.get_host_api_info_by_index(k[1])['name']
        print("\t%s: %s" % (name, value))
    print("\t--------------------------------")
except IOError as e:
    print("No Input devices: %s" % e[0])

try:
    def_index = p.get_default_output_device_info()['index']
    print("Default Output Device: %s" % def_index)
    devinfo = p.get_device_info_by_index(def_index)
    for k in list(devinfo.items()):
        name, value = k
        if name == 'hostApi':
            value = str(value) + \
                    " (%s)" % p.get_host_api_info_by_index(k[1])['name']
        print("\t%s: %s" % (name, value))
    print("\t--------------------------------")
except IOError as e:
    print("No Output devices: %s" % e[0])

p.terminate()