MCI CD Audio Test

mci_cdaudio.py

from ctypes import *
from ctypes.wintypes import *

winmm = windll.winmm


class MciException(Exception):
    def __init__(self, code):
        self.code = code
        success, self.message = mci_get_error_string(code)

        if success == 0:
            self.message = 'Unknown error.'


    def __str__(self):
        return f'{self.code}: {self.message}'


def mci_send_string(lpszCommand: str, hwndCallback=None):
    mciSendString = winmm.mciSendStringA
    mciSendString.argtypes = [LPCSTR, LPSTR, UINT, HANDLE]
    mciSendString.restype = DWORD

    lpszCommand = LPCSTR(lpszCommand.encode())
    lpszReturnString = create_string_buffer(256)
    cchReturn = UINT(256)
    hwndCallback = HANDLE(hwndCallback)

    error_code = mciSendString(
        lpszCommand, lpszReturnString, cchReturn, hwndCallback)

    if error_code != 0:
        raise MciException(error_code)
    else:
        return lpszReturnString.value.decode()


def mci_get_error_string(fdwError: DWORD):
    mciGetErrorString = winmm.mciGetErrorStringA
    mciGetErrorString.argtypes = [DWORD, LPSTR, UINT]
    mciGetErrorString.restype = BOOL

    lpszErrorText = create_string_buffer(1024)
    cchErrorText = UINT(1024)

    res = mciGetErrorString(fdwError, lpszErrorText, cchErrorText)
    return (res, lpszErrorText.value.decode())


def mci_open(lpszDevice, lpszOpenFlags='', lpszFlags='wait'):
    lpszCommand = f'open {lpszDevice} {lpszOpenFlags} {lpszFlags}'
    return mci_send_string(lpszCommand)


def mci_close(lpszDeviceID, lpszFlags='wait'):
    lpszCommand = f'close {lpszDeviceID} {lpszFlags}'
    return mci_send_string(lpszCommand)


def mci_status(lpszDeviceID, lpszRequest, lpszFlags='wait'):
    lpszCommand = f'status {lpszDeviceID} {lpszRequest} {lpszFlags}'
    return mci_send_string(lpszCommand)


def mci_capability(lpszDeviceID, lpszRequest, lpszFlags='wait'):
    lpszCommand = f'capability {lpszDeviceID} {lpszRequest} {lpszFlags}'
    return mci_send_string(lpszCommand)


def main():
    open_msg = mci_open('cdaudio')
    print(open_msg)

    status = mci_status('cdaudio', 'mode')
    print(status)

    capability = mci_capability('cdaudio', 'can eject')
    print(capability)

    close_msg = mci_close('cdaudio')
    print(close_msg)


if __name__ == '__main__':
    main()