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# -*- coding: utf-8 -*-
"""
The MIT License (MIT)
Copyright (c) 2015 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 ctypes
import ctypes.util
import array
from .errors import DiscordException
import logging
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)
# 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.
exported_functions = [
('opus_strerror', [ctypes.c_int], ctypes.c_char_p),
('opus_encoder_get_size', [ctypes.c_int], ctypes.c_int),
('opus_encoder_create', [ctypes.c_int, ctypes.c_int, ctypes.c_int, c_int_ptr], EncoderStructPtr),
('opus_encode', [EncoderStructPtr, c_int16_ptr, ctypes.c_int, ctypes.c_char_p, ctypes.c_int32], ctypes.c_int32),
('opus_encoder_destroy', [EncoderStructPtr], None)
]
def libopus_loader(name):
# create the library...
lib = ctypes.cdll.LoadLibrary(name)
# register the functions...
for item in exported_functions:
try:
func = getattr(lib, item[0])
except Exception as e:
raise e
try:
func.argtypes = item[1]
func.restype = item[2]
except KeyError:
pass
return lib
try:
_lib = libopus_loader(ctypes.util.find_library('opus'))
except:
_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
``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, the .dll extension is not necessary. However, on Linux
the full extension is required to load the library, e.g. ``libopus.so.1``.
:param name: The filename of the shared library.
"""
global _lib
_lib = libopus_loader(name)
class OpusError(DiscordException):
"""An exception that is thrown for libopus related errors."""
def __init__(self, code):
self.code = code
msg = _lib.opus_strerror(self.code).decode('utf-8')
log.info('"{}" has happened'.format(msg))
super(DiscordException, self).__init__(msg)
# Some constants...
OK = 0
APPLICATION_AUDIO = 2049
APPLICATION_VOIP = 2048
APPLICATION_LOWDELAY = 2051
class Encoder:
def __init__(self, sampling, channels, application=APPLICATION_AUDIO):
self.sampling_rate = sampling
self.channels = channels
self.application = application
self.frame_length = 20
self.sample_size = 2 * self.channels # (bit_rate / 8) but bit_rate == 16
self.samples_per_frame = int(self.sampling_rate / 1000 * self.frame_length)
self.frame_size = self.samples_per_frame * self.sample_size
self._state = self._create_state()
def __del__(self):
if hasattr(self, '_state'):
_lib.opus_encoder_destroy(self._state)
self._state = None
def _create_state(self):
ret = ctypes.c_int()
result = _lib.opus_encoder_create(self.sampling_rate, self.channels, self.application, ctypes.byref(ret))
if ret.value != 0:
log.info('error has happened in state creation')
raise OpusError(ret.value)
return result
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)
if ret < 0:
log.info('error has happened in encode')
raise OpusError(ret)
return array.array('b', data[:ret]).tobytes()
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