399 lines
9.6 KiB
Python
399 lines
9.6 KiB
Python
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'''
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Documentation:
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http://docs.microsoft.com/en-us/windows/desktop/Multimedia
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.. versionadded:: 1.4.0
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'''
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from os.path import join
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from ctypes import windll
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from ctypes import (
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sizeof, c_void_p, c_ulonglong, c_ulong,
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c_wchar_p, byref, Structure, create_string_buffer
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)
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from ctypes.wintypes import DWORD, UINT
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from plyer.facades import Audio
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from plyer.platforms.win.storagepath import WinStoragePath
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# DWORD_PTR i.e. ULONG_PTR, 32/64bit
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ULONG_PTR = c_ulonglong if sizeof(c_void_p) == 8 else c_ulong
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# device specific symbols
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MCI_OPEN = 0x803
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MCI_OPEN_TYPE = 0x2000
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MCI_OPEN_ELEMENT = 512
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MCI_RECORD = 0x80F
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MCI_STOP = 0x808
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MCI_SAVE = 0x813
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MCI_PLAY = 0x806
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MCI_CLOSE = 0x804
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# recorder specific symbols
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MCI_FROM = 4
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MCI_TO = 8
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MCI_WAIT = 2
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MCI_SAVE_FILE = 256
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class MCI_OPEN_PARMS(Structure):
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'''
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Struct for MCI_OPEN message parameters.
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.. versionadded:: 1.4.0
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'''
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_fields_ = [
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('mciOpenParms', ULONG_PTR),
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('wDeviceID', UINT),
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('lpstrDeviceType', c_wchar_p),
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('lpstrElementName', c_wchar_p),
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('lpstrAlias', c_wchar_p)
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]
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class MCI_RECORD_PARMS(Structure):
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'''
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Struct for MCI_RECORD message parameters.
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http://docs.microsoft.com/en-us/windows/desktop/Multimedia/mci-record-parms
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.. versionadded:: 1.4.0
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'''
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_fields_ = [
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('dwCallback', ULONG_PTR),
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('dwFrom', DWORD),
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('dwTo', DWORD)
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]
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class MCI_SAVE_PARMS(Structure):
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'''
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Struct for MCI_SAVE message parameters.
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http://docs.microsoft.com/en-us/windows/desktop/Multimedia/mci-save-parms
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.. versionadded:: 1.4.0
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'''
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_fields_ = [
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('dwCallback', ULONG_PTR),
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('lpfilename', c_wchar_p)
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]
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class MCI_PLAY_PARMS(Structure):
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'''
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Struct for MCI_PLAY message parameters.
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http://docs.microsoft.com/en-us/windows/desktop/Multimedia/mci-play-parms
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.. versionadded:: 1.4.0
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'''
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_fields_ = [
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('dwCallback', ULONG_PTR),
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('dwFrom', DWORD),
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('dwTo', DWORD)
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]
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def send_command(device, msg, flags, params):
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'''
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Generic mciSendCommandW() wrapper with error handler.
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All parameters are required as for mciSendCommandW().
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In case of no `params` passed, use `None`, that value
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won't be dereferenced.
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.. versionadded:: 1.4.0
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'''
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multimedia = windll.winmm
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send_command_w = multimedia.mciSendCommandW
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get_error = multimedia.mciGetErrorStringW
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# error text buffer
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# by API specification 128 is max, however the API sometimes
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# kind of does not respect the documented bounds and returns
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# more characters than buffer length...?!
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error_len = 128
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# big enough to prevent API accidentally segfaulting
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error_text = create_string_buffer(error_len * 2)
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# open a recording device with a new file
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error_code = send_command_w(
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device, # device ID
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msg,
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flags,
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# reference to parameters structure or original value
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# in case of params=False/0/None/...
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byref(params) if params else params
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)
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# handle error messages if any
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if error_code:
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# device did not open, raise an exception
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get_error(error_code, byref(error_text), error_len)
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error_text = error_text.raw.replace(b'\x00', b'').decode('utf-8')
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# either it can close already open device or it will fail because
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# the device is in non-closable state, but the end result is the same
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# and it makes no sense to parse MCI_CLOSE's error in this case
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send_command_w(device, MCI_CLOSE, 0, None)
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raise Exception(error_code, error_text)
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# return params struct because some commands write into it
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# to pass some values out of the local function scope
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return params
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class WinRecorder:
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'''
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Generic wrapper for MCI_RECORD handling the filenames and device closing
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in the same approach like it is used for other platforms.
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.. versionadded:: 1.4.0
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'''
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def __init__(self, device, filename):
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self._device = device
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self._filename = filename
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@property
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def device(self):
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'''
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Public property returning device ID.
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.. versionadded:: 1.4.0
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'''
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return self._device
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@property
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def filename(self):
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'''
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Public property returning filename for current recording.
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.. versionadded:: 1.4.0
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'''
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return self._filename
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def record(self):
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'''
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Start recording a WAV sound.
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.. versionadded:: 1.4.0
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'''
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send_command(
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device=self.device,
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msg=MCI_RECORD,
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flags=0,
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params=None
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)
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def stop(self):
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'''
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Stop recording and save the data to a file path
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self.filename. Wait until the file is written.
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Close the device afterwards.
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.. versionadded:: 1.4.0
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'''
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# stop the recording first
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send_command(
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device=self.device,
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msg=MCI_STOP,
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flags=MCI_WAIT,
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params=None
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)
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# choose filename for the WAV file
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save_params = MCI_SAVE_PARMS()
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save_params.lpfilename = self.filename
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# save the sound data to a file and wait
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# until it ends writing to the file
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send_command(
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device=self.device,
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msg=MCI_SAVE,
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flags=MCI_SAVE_FILE | MCI_WAIT,
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params=save_params
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)
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# close the recording device
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send_command(
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device=self.device,
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msg=MCI_CLOSE,
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flags=0,
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params=None
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)
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class WinPlayer:
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'''
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Generic wrapper for MCI_PLAY handling the device closing.
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.. versionadded:: 1.4.0
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'''
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def __init__(self, device):
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self._device = device
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@property
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def device(self):
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'''
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Public property returning device ID.
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.. versionadded:: 1.4.0
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'''
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return self._device
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def play(self):
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'''
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Start playing a WAV sound.
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.. versionadded:: 1.4.0
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'''
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play_params = MCI_PLAY_PARMS()
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play_params.dwFrom = 0
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send_command(
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device=self.device,
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msg=MCI_PLAY,
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flags=MCI_FROM,
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params=play_params
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)
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def stop(self):
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'''
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Stop playing a WAV sound and close the device.
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.. versionadded:: 1.4.0
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'''
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send_command(
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device=self.device,
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msg=MCI_STOP,
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flags=MCI_WAIT,
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params=None
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)
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# close the playing device
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send_command(
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device=self.device,
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msg=MCI_CLOSE,
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flags=0,
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params=None
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)
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class WinAudio(Audio):
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'''
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Windows implementation of audio recording and audio playing.
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.. versionadded:: 1.4.0
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'''
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def __init__(self, file_path=None):
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# default path unless specified otherwise
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default_path = join(
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WinStoragePath().get_music_dir(),
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'audio.wav'
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)
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super().__init__(file_path or default_path)
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self._recorder = None
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self._player = None
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self._current_file = None
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def _start(self):
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'''
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Start recording a WAV sound in the background asynchronously.
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.. versionadded:: 1.4.0
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'''
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# clean everything before recording in case
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# there is a different device open
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self._stop()
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# create structure and set device parameters
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open_params = MCI_OPEN_PARMS()
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open_params.lpstrDeviceType = 'waveaudio'
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open_params.lpstrElementName = ''
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# open a new device for recording
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open_params = send_command(
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device=0, # device ID before opening
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msg=MCI_OPEN,
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# empty filename in lpstrElementName
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# device type in lpstrDeviceType
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flags=MCI_OPEN_ELEMENT | MCI_OPEN_TYPE,
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params=open_params
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)
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# get recorder with device id and path for saving
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self._recorder = WinRecorder(
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device=open_params.wDeviceID,
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filename=self._file_path
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)
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self._recorder.record()
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# Setting the currently recorded file as current file
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# for using it as a parameter in audio player
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self._current_file = self._recorder.filename
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def _stop(self):
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'''
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Stop recording or playing of a WAV sound.
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.. versionadded:: 1.4.0
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'''
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if self._recorder:
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self._recorder.stop()
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self._recorder = None
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if self._player:
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self._player.stop()
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self._player = None
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def _play(self):
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'''
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Play a WAV sound from a file. Prioritize latest recorded file before
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default file path from WinAudio.
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.. versionadded:: 1.4.0
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'''
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# create structure and set device parameters
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open_params = MCI_OPEN_PARMS()
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open_params.lpstrDeviceType = 'waveaudio'
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open_params.lpstrElementName = self._current_file or self._file_path
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# open a new device for playing
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open_params = send_command(
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device=0, # device ID before opening
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msg=MCI_OPEN,
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# existing filename in lpstrElementName
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# device type in lpstrDeviceType
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flags=MCI_OPEN_ELEMENT | MCI_OPEN_TYPE,
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params=open_params
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)
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# get recorder with device id and path for saving
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self._player = WinPlayer(device=open_params.wDeviceID)
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self._player.play()
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def instance():
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'''
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Instance for facade proxy.
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'''
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return WinAudio()
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