276 lines
8.1 KiB
Python
276 lines
8.1 KiB
Python
|
# -*- coding: utf-8 -*-
|
||
|
|
|
||
|
|
"""
|
||
|
|
The MIT License (MIT)
|
||
|
|
|
||
|
|
Copyright (c) 2015-2019 Rapptz
|
||
|
|
|
||
|
|
Permission is hereby granted, free of charge, to any person obtaining a
|
||
|
|
copy of this software and associated documentation files (the "Software"),
|
||
|
|
to deal in the Software without restriction, including without limitation
|
||
|
|
the rights to use, copy, modify, merge, publish, distribute, sublicense,
|
||
|
|
and/or sell copies of the Software, and to permit persons to whom the
|
||
|
|
Software is furnished to do so, subject to the following conditions:
|
||
|
|
|
||
|
|
The above copyright notice and this permission notice shall be included in
|
||
|
|
all copies or substantial portions of the Software.
|
||
|
|
|
||
|
|
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
|
||
|
|
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||
|
|
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||
|
|
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||
|
|
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
|
||
|
|
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
|
||
|
|
DEALINGS IN THE SOFTWARE.
|
||
|
|
"""
|
||
|
|
|
||
|
|
import array
|
||
|
|
import ctypes
|
||
|
|
import ctypes.util
|
||
|
|
import logging
|
||
|
|
import os.path
|
||
|
|
import sys
|
||
|
|
|
||
|
|
from .errors import DiscordException
|
||
|
|
|
||
|
|
log = logging.getLogger(__name__)
|
||
|
|
c_int_ptr = ctypes.POINTER(ctypes.c_int)
|
||
|
|
c_int16_ptr = ctypes.POINTER(ctypes.c_int16)
|
||
|
|
c_float_ptr = ctypes.POINTER(ctypes.c_float)
|
||
|
|
|
||
|
|
class EncoderStruct(ctypes.Structure):
|
||
|
|
pass
|
||
|
|
|
||
|
|
EncoderStructPtr = ctypes.POINTER(EncoderStruct)
|
||
|
|
|
||
|
|
def _err_lt(result, func, args):
|
||
|
|
if result < 0:
|
||
|
|
log.info('error has happened in %s', func.__name__)
|
||
|
|
raise OpusError(result)
|
||
|
|
return result
|
||
|
|
|
||
|
|
def _err_ne(result, func, args):
|
||
|
|
ret = args[-1]._obj
|
||
|
|
if ret.value != 0:
|
||
|
|
log.info('error has happened in %s', func.__name__)
|
||
|
|
raise OpusError(ret.value)
|
||
|
|
return result
|
||
|
|
|
||
|
|
# A list of exported functions.
|
||
|
|
# The first argument is obviously the name.
|
||
|
|
# The second one are the types of arguments it takes.
|
||
|
|
# The third is the result type.
|
||
|
|
# The fourth is the error handler.
|
||
|
|
exported_functions = [
|
||
|
|
('opus_strerror',
|
||
|
|
[ctypes.c_int], ctypes.c_char_p, None),
|
||
|
|
('opus_encoder_get_size',
|
||
|
|
[ctypes.c_int], ctypes.c_int, None),
|
||
|
|
('opus_encoder_create',
|
||
|
|
[ctypes.c_int, ctypes.c_int, ctypes.c_int, c_int_ptr], EncoderStructPtr, _err_ne),
|
||
|
|
('opus_encode',
|
||
|
|
[EncoderStructPtr, c_int16_ptr, ctypes.c_int, ctypes.c_char_p, ctypes.c_int32], ctypes.c_int32, _err_lt),
|
||
|
|
('opus_encoder_ctl',
|
||
|
|
None, ctypes.c_int32, _err_lt),
|
||
|
|
('opus_encoder_destroy',
|
||
|
|
[EncoderStructPtr], None, None),
|
||
|
|
]
|
||
|
|
|
||
|
|
def libopus_loader(name):
|
||
|
|
# create the library...
|
||
|
|
lib = ctypes.cdll.LoadLibrary(name)
|
||
|
|
|
||
|
|
# register the functions...
|
||
|
|
for item in exported_functions:
|
||
|
|
func = getattr(lib, item[0])
|
||
|
|
|
||
|
|
try:
|
||
|
|
if item[1]:
|
||
|
|
func.argtypes = item[1]
|
||
|
|
|
||
|
|
func.restype = item[2]
|
||
|
|
except KeyError:
|
||
|
|
pass
|
||
|
|
|
||
|
|
try:
|
||
|
|
if item[3]:
|
||
|
|
func.errcheck = item[3]
|
||
|
|
except KeyError:
|
||
|
|
log.exception("Error assigning check function to %s", func)
|
||
|
|
|
||
|
|
return lib
|
||
|
|
|
||
|
|
try:
|
||
|
|
if sys.platform == 'win32':
|
||
|
|
_basedir = os.path.dirname(os.path.abspath(__file__))
|
||
|
|
_bitness = 'x64' if sys.maxsize > 2**32 else 'x86'
|
||
|
|
_filename = os.path.join(_basedir, 'bin', 'libopus-0.{}.dll'.format(_bitness))
|
||
|
|
_lib = libopus_loader(_filename)
|
||
|
|
else:
|
||
|
|
_lib = libopus_loader(ctypes.util.find_library('opus'))
|
||
|
|
except Exception:
|
||
|
|
_lib = None
|
||
|
|
|
||
|
|
def load_opus(name):
|
||
|
|
"""Loads the libopus shared library for use with voice.
|
||
|
|
|
||
|
|
If this function is not called then the library uses the function
|
||
|
|
:func:`ctypes.util.find_library` and then loads that one
|
||
|
|
if available.
|
||
|
|
|
||
|
|
Not loading a library leads to voice not working.
|
||
|
|
|
||
|
|
This function propagates the exceptions thrown.
|
||
|
|
|
||
|
|
.. warning::
|
||
|
|
|
||
|
|
The bitness of the library must match the bitness of your python
|
||
|
|
interpreter. If the library is 64-bit then your python interpreter
|
||
|
|
must be 64-bit as well. Usually if there's a mismatch in bitness then
|
||
|
|
the load will throw an exception.
|
||
|
|
|
||
|
|
.. note::
|
||
|
|
|
||
|
|
On Windows, this function should not need to be called as the binaries
|
||
|
|
are automatically loaded.
|
||
|
|
|
||
|
|
.. note::
|
||
|
|
|
||
|
|
On Windows, the .dll extension is not necessary. However, on Linux
|
||
|
|
the full extension is required to load the library, e.g. ``libopus.so.1``.
|
||
|
|
On Linux however, :func:`ctypes.util.find_library` will usually find the library automatically
|
||
|
|
without you having to call this.
|
||
|
|
|
||
|
|
Parameters
|
||
|
|
----------
|
||
|
|
name: :class:`str`
|
||
|
|
The filename of the shared library.
|
||
|
|
"""
|
||
|
|
global _lib
|
||
|
|
_lib = libopus_loader(name)
|
||
|
|
|
||
|
|
def is_loaded():
|
||
|
|
"""Function to check if opus lib is successfully loaded either
|
||
|
|
via the :func:`ctypes.util.find_library` call of :func:`load_opus`.
|
||
|
|
|
||
|
|
This must return ``True`` for voice to work.
|
||
|
|
|
||
|
|
Returns
|
||
|
|
-------
|
||
|
|
:class:`bool`
|
||
|
|
Indicates if the opus library has been loaded.
|
||
|
|
"""
|
||
|
|
global _lib
|
||
|
|
return _lib is not None
|
||
|
|
|
||
|
|
class OpusError(DiscordException):
|
||
|
|
"""An exception that is thrown for libopus related errors.
|
||
|
|
|
||
|
|
Attributes
|
||
|
|
----------
|
||
|
|
code: :class:`int`
|
||
|
|
The error code returned.
|
||
|
|
"""
|
||
|
|
|
||
|
|
def __init__(self, code):
|
||
|
|
self.code = code
|
||
|
|
msg = _lib.opus_strerror(self.code).decode('utf-8')
|
||
|
|
log.info('"%s" has happened', msg)
|
||
|
|
super().__init__(msg)
|
||
|
|
|
||
|
|
class OpusNotLoaded(DiscordException):
|
||
|
|
"""An exception that is thrown for when libopus is not loaded."""
|
||
|
|
pass
|
||
|
|
|
||
|
|
|
||
|
|
# Some constants...
|
||
|
|
OK = 0
|
||
|
|
APPLICATION_AUDIO = 2049
|
||
|
|
APPLICATION_VOIP = 2048
|
||
|
|
APPLICATION_LOWDELAY = 2051
|
||
|
|
CTL_SET_BITRATE = 4002
|
||
|
|
CTL_SET_BANDWIDTH = 4008
|
||
|
|
CTL_SET_FEC = 4012
|
||
|
|
CTL_SET_PLP = 4014
|
||
|
|
CTL_SET_SIGNAL = 4024
|
||
|
|
|
||
|
|
band_ctl = {
|
||
|
|
'narrow': 1101,
|
||
|
|
'medium': 1102,
|
||
|
|
'wide': 1103,
|
||
|
|
'superwide': 1104,
|
||
|
|
'full': 1105,
|
||
|
|
}
|
||
|
|
|
||
|
|
signal_ctl = {
|
||
|
|
'auto': -1000,
|
||
|
|
'voice': 3001,
|
||
|
|
'music': 3002,
|
||
|
|
}
|
||
|
|
|
||
|
|
class Encoder:
|
||
|
|
SAMPLING_RATE = 48000
|
||
|
|
CHANNELS = 2
|
||
|
|
FRAME_LENGTH = 20
|
||
|
|
SAMPLE_SIZE = 4 # (bit_rate / 8) * CHANNELS (bit_rate == 16)
|
||
|
|
SAMPLES_PER_FRAME = int(SAMPLING_RATE / 1000 * FRAME_LENGTH)
|
||
|
|
|
||
|
|
FRAME_SIZE = SAMPLES_PER_FRAME * SAMPLE_SIZE
|
||
|
|
|
||
|
|
def __init__(self, application=APPLICATION_AUDIO):
|
||
|
|
self.application = application
|
||
|
|
|
||
|
|
if not is_loaded():
|
||
|
|
raise OpusNotLoaded()
|
||
|
|
|
||
|
|
self._state = self._create_state()
|
||
|
|
self.set_bitrate(128)
|
||
|
|
self.set_fec(True)
|
||
|
|
self.set_expected_packet_loss_percent(0.15)
|
||
|
|
self.set_bandwidth('full')
|
||
|
|
self.set_signal_type('auto')
|
||
|
|
|
||
|
|
def __del__(self):
|
||
|
|
if hasattr(self, '_state'):
|
||
|
|
_lib.opus_encoder_destroy(self._state)
|
||
|
|
self._state = None
|
||
|
|
|
||
|
|
def _create_state(self):
|
||
|
|
ret = ctypes.c_int()
|
||
|
|
return _lib.opus_encoder_create(self.SAMPLING_RATE, self.CHANNELS, self.application, ctypes.byref(ret))
|
||
|
|
|
||
|
|
def set_bitrate(self, kbps):
|
||
|
|
kbps = min(512, max(16, int(kbps)))
|
||
|
|
|
||
|
|
_lib.opus_encoder_ctl(self._state, CTL_SET_BITRATE, kbps * 1024)
|
||
|
|
return kbps
|
||
|
|
|
||
|
|
def set_bandwidth(self, req):
|
||
|
|
if req not in band_ctl:
|
||
|
|
raise KeyError('%r is not a valid bandwidth setting. Try one of: %s' % (req, ','.join(band_ctl)))
|
||
|
|
|
||
|
|
k = band_ctl[req]
|
||
|
|
_lib.opus_encoder_ctl(self._state, CTL_SET_BANDWIDTH, k)
|
||
|
|
|
||
|
|
def set_signal_type(self, req):
|
||
|
|
if req not in signal_ctl:
|
||
|
|
raise KeyError('%r is not a valid signal setting. Try one of: %s' % (req, ','.join(signal_ctl)))
|
||
|
|
|
||
|
|
k = signal_ctl[req]
|
||
|
|
_lib.opus_encoder_ctl(self._state, CTL_SET_SIGNAL, k)
|
||
|
|
|
||
|
|
def set_fec(self, enabled=True):
|
||
|
|
_lib.opus_encoder_ctl(self._state, CTL_SET_FEC, 1 if enabled else 0)
|
||
|
|
|
||
|
|
def set_expected_packet_loss_percent(self, percentage):
|
||
|
|
_lib.opus_encoder_ctl(self._state, CTL_SET_PLP, min(100, max(0, int(percentage * 100))))
|
||
|
|
|
||
|
|
def encode(self, pcm, frame_size):
|
||
|
|
max_data_bytes = len(pcm)
|
||
|
|
pcm = ctypes.cast(pcm, c_int16_ptr)
|
||
|
|
data = (ctypes.c_char * max_data_bytes)()
|
||
|
|
|
||
|
|
ret = _lib.opus_encode(self._state, pcm, frame_size, data, max_data_bytes)
|
||
|
|
|
||
|
|
return array.array('b', data[:ret]).tobytes()
|