276 lines
8.2 KiB
Python
276 lines
8.2 KiB
Python
# -*- coding: utf-8 -*-
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"""
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The MIT License (MIT)
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Copyright (c) 2015-2017 Rapptz
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Permission is hereby granted, free of charge, to any person obtaining a
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copy of this software and associated documentation files (the "Software"),
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to deal in the Software without restriction, including without limitation
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the rights to use, copy, modify, merge, publish, distribute, sublicense,
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and/or sell copies of the Software, and to permit persons to whom the
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Software is furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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DEALINGS IN THE SOFTWARE.
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"""
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import ctypes
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import ctypes.util
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import array
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from .errors import DiscordException
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import logging
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import sys
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import os.path
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log = logging.getLogger(__name__)
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c_int_ptr = ctypes.POINTER(ctypes.c_int)
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c_int16_ptr = ctypes.POINTER(ctypes.c_int16)
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c_float_ptr = ctypes.POINTER(ctypes.c_float)
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class EncoderStruct(ctypes.Structure):
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pass
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EncoderStructPtr = ctypes.POINTER(EncoderStruct)
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def _err_lt(result, func, args):
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if result < 0:
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log.info('error has happened in {0.__name__}'.format(func))
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raise OpusError(result)
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return result
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def _err_ne(result, func, args):
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ret = args[-1]._obj
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if ret.value != 0:
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log.info('error has happened in {0.__name__}'.format(func))
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raise OpusError(ret.value)
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return result
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# A list of exported functions.
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# The first argument is obviously the name.
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# The second one are the types of arguments it takes.
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# The third is the result type.
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# The fourth is the error handler.
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exported_functions = [
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('opus_strerror',
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[ctypes.c_int], ctypes.c_char_p, None),
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('opus_encoder_get_size',
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[ctypes.c_int], ctypes.c_int, None),
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('opus_encoder_create',
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[ctypes.c_int, ctypes.c_int, ctypes.c_int, c_int_ptr], EncoderStructPtr, _err_ne),
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('opus_encode',
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[EncoderStructPtr, c_int16_ptr, ctypes.c_int, ctypes.c_char_p, ctypes.c_int32], ctypes.c_int32, _err_lt),
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('opus_encoder_ctl',
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None, ctypes.c_int32, _err_lt),
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('opus_encoder_destroy',
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[EncoderStructPtr], None, None),
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]
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def libopus_loader(name):
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# create the library...
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lib = ctypes.cdll.LoadLibrary(name)
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# register the functions...
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for item in exported_functions:
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try:
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func = getattr(lib, item[0])
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except Exception as e:
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raise e
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try:
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if item[1]:
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func.argtypes = item[1]
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func.restype = item[2]
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except KeyError:
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pass
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try:
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if item[3]:
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func.errcheck = item[3]
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except KeyError:
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log.exception("Error assigning check function to %s", func)
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return lib
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try:
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if sys.platform == 'win32':
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_basedir = os.path.dirname(os.path.abspath(__file__))
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_bitness = 'x64' if sys.maxsize > 2**32 else 'x86'
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_filename = os.path.join(_basedir, 'bin', 'libopus-0.{}.dll'.format(_bitness))
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_lib = libopus_loader(_filename)
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else:
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_lib = libopus_loader(ctypes.util.find_library('opus'))
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except Exception as e:
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_lib = None
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def load_opus(name):
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"""Loads the libopus shared library for use with voice.
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If this function is not called then the library uses the function
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`ctypes.util.find_library`__ and then loads that one
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if available.
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.. _find library: https://docs.python.org/3.5/library/ctypes.html#finding-shared-libraries
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__ `find library`_
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Not loading a library leads to voice not working.
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This function propagates the exceptions thrown.
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Warning
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--------
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The bitness of the library must match the bitness of your python
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interpreter. If the library is 64-bit then your python interpreter
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must be 64-bit as well. Usually if there's a mismatch in bitness then
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the load will throw an exception.
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Note
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----
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On Windows, the .dll extension is not necessary. However, on Linux
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the full extension is required to load the library, e.g. ``libopus.so.1``.
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On Linux however, `find library`_ will usually find the library automatically
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without you having to call this.
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Parameters
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----------
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name: str
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The filename of the shared library.
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"""
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global _lib
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_lib = libopus_loader(name)
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def is_loaded():
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"""Function to check if opus lib is successfully loaded either
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via the ``ctypes.util.find_library`` call of :func:`load_opus`.
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This must return ``True`` for voice to work.
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Returns
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-------
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bool
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Indicates if the opus library has been loaded.
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"""
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global _lib
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return _lib is not None
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class OpusError(DiscordException):
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"""An exception that is thrown for libopus related errors.
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Attributes
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----------
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code : :class:`int`
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The error code returned.
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"""
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def __init__(self, code):
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self.code = code
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msg = _lib.opus_strerror(self.code).decode('utf-8')
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log.info('"%s" has happened', msg)
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super().__init__(msg)
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class OpusNotLoaded(DiscordException):
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"""An exception that is thrown for when libopus is not loaded."""
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pass
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# Some constants...
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OK = 0
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APPLICATION_AUDIO = 2049
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APPLICATION_VOIP = 2048
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APPLICATION_LOWDELAY = 2051
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CTL_SET_BITRATE = 4002
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CTL_SET_BANDWIDTH = 4008
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CTL_SET_FEC = 4012
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CTL_SET_PLP = 4014
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CTL_SET_SIGNAL = 4024
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band_ctl = {
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'narrow': 1101,
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'medium': 1102,
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'wide': 1103,
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'superwide': 1104,
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'full': 1105,
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}
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signal_ctl = {
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'auto': -1000,
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'voice': 3001,
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'music': 3002,
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}
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class Encoder:
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SAMPLING_RATE = 48000
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CHANNELS = 2
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FRAME_LENGTH = 20
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SAMPLE_SIZE = 4 # (bit_rate / 8) * CHANNELS (bit_rate == 16)
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SAMPLES_PER_FRAME = int(SAMPLING_RATE / 1000 * FRAME_LENGTH)
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FRAME_SIZE = SAMPLES_PER_FRAME * SAMPLE_SIZE
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def __init__(self, application=APPLICATION_AUDIO):
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self.application = application
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if not is_loaded():
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raise OpusNotLoaded()
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self._state = self._create_state()
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self.set_bitrate(128)
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self.set_fec(True)
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self.set_expected_packet_loss_percent(0.15)
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self.set_bandwidth('full')
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self.set_signal_type('auto')
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def __del__(self):
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if hasattr(self, '_state'):
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_lib.opus_encoder_destroy(self._state)
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self._state = None
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def _create_state(self):
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ret = ctypes.c_int()
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return _lib.opus_encoder_create(self.SAMPLING_RATE, self.CHANNELS, self.application, ctypes.byref(ret))
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def set_bitrate(self, kbps):
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kbps = min(128, max(16, int(kbps)))
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_lib.opus_encoder_ctl(self._state, CTL_SET_BITRATE, kbps * 1024)
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return kbps
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def set_bandwidth(self, req):
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if req not in band_ctl:
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raise KeyError('%r is not a valid bandwidth setting. Try one of: %s' % (req, ','.join(band_ctl)))
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k = band_ctl[req]
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_lib.opus_encoder_ctl(self._state, CTL_SET_BANDWIDTH, k)
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def set_signal_type(self, req):
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if req not in signal_ctl:
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raise KeyError('%r is not a valid signal setting. Try one of: %s' % (req, ','.join(signal_ctl)))
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k = signal_ctl[req]
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_lib.opus_encoder_ctl(self._state, CTL_SET_SIGNAL, k)
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def set_fec(self, enabled=True):
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_lib.opus_encoder_ctl(self._state, CTL_SET_FEC, 1 if enabled else 0)
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def set_expected_packet_loss_percent(self, percentage):
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_lib.opus_encoder_ctl(self._state, CTL_SET_PLP, min(100, max(0, int(percentage * 100))))
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def encode(self, pcm, frame_size):
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max_data_bytes = len(pcm)
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pcm = ctypes.cast(pcm, c_int16_ptr)
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data = (ctypes.c_char * max_data_bytes)()
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ret = _lib.opus_encode(self._state, pcm, frame_size, data, max_data_bytes)
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return array.array('b', data[:ret]).tobytes()
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