656 lines
22 KiB
Python
656 lines
22 KiB
Python
# -*- coding: utf-8 -*-
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"""
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The MIT License (MIT)
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Copyright (c) 2015-2020 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 threading
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import traceback
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import subprocess
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import audioop
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import asyncio
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import logging
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import shlex
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import time
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import json
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import sys
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import re
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from .errors import ClientException
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from .opus import Encoder as OpusEncoder
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from .oggparse import OggStream
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log = logging.getLogger(__name__)
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__all__ = (
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'AudioSource',
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'PCMAudio',
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'FFmpegAudio',
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'FFmpegPCMAudio',
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'FFmpegOpusAudio',
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'PCMVolumeTransformer',
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)
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class AudioSource:
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"""Represents an audio stream.
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The audio stream can be Opus encoded or not, however if the audio stream
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is not Opus encoded then the audio format must be 16-bit 48KHz stereo PCM.
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.. warning::
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The audio source reads are done in a separate thread.
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"""
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def read(self):
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"""Reads 20ms worth of audio.
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Subclasses must implement this.
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If the audio is complete, then returning an empty
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:term:`py:bytes-like object` to signal this is the way to do so.
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If :meth:`is_opus` method returns ``True``, then it must return
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20ms worth of Opus encoded audio. Otherwise, it must be 20ms
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worth of 16-bit 48KHz stereo PCM, which is about 3,840 bytes
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per frame (20ms worth of audio).
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Returns
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--------
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:class:`bytes`
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A bytes like object that represents the PCM or Opus data.
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"""
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raise NotImplementedError
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def is_opus(self):
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"""Checks if the audio source is already encoded in Opus."""
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return False
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def cleanup(self):
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"""Called when clean-up is needed to be done.
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Useful for clearing buffer data or processes after
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it is done playing audio.
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"""
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pass
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def __del__(self):
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self.cleanup()
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class PCMAudio(AudioSource):
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"""Represents raw 16-bit 48KHz stereo PCM audio source.
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Attributes
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-----------
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stream: :term:`py:file object`
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A file-like object that reads byte data representing raw PCM.
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"""
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def __init__(self, stream):
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self.stream = stream
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def read(self):
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ret = self.stream.read(OpusEncoder.FRAME_SIZE)
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if len(ret) != OpusEncoder.FRAME_SIZE:
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return b''
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return ret
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class FFmpegAudio(AudioSource):
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"""Represents an FFmpeg (or AVConv) based AudioSource.
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User created AudioSources using FFmpeg differently from how :class:`FFmpegPCMAudio` and
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:class:`FFmpegOpusAudio` work should subclass this.
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.. versionadded:: 1.3
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"""
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def __init__(self, source, *, executable='ffmpeg', args, **subprocess_kwargs):
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self._process = self._stdout = None
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args = [executable, *args]
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kwargs = {'stdout': subprocess.PIPE}
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kwargs.update(subprocess_kwargs)
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self._process = self._spawn_process(args, **kwargs)
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self._stdout = self._process.stdout
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def _spawn_process(self, args, **subprocess_kwargs):
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process = None
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try:
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process = subprocess.Popen(args, **subprocess_kwargs)
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except FileNotFoundError:
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executable = args.partition(' ')[0] if isinstance(args, str) else args[0]
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raise ClientException(executable + ' was not found.') from None
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except subprocess.SubprocessError as exc:
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raise ClientException('Popen failed: {0.__class__.__name__}: {0}'.format(exc)) from exc
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else:
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return process
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def cleanup(self):
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proc = self._process
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if proc is None:
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return
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log.info('Preparing to terminate ffmpeg process %s.', proc.pid)
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try:
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proc.kill()
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except Exception:
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log.exception("Ignoring error attempting to kill ffmpeg process %s", proc.pid)
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if proc.poll() is None:
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log.info('ffmpeg process %s has not terminated. Waiting to terminate...', proc.pid)
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proc.communicate()
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log.info('ffmpeg process %s should have terminated with a return code of %s.', proc.pid, proc.returncode)
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else:
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log.info('ffmpeg process %s successfully terminated with return code of %s.', proc.pid, proc.returncode)
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self._process = self._stdout = None
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class FFmpegPCMAudio(FFmpegAudio):
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"""An audio source from FFmpeg (or AVConv).
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This launches a sub-process to a specific input file given.
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.. warning::
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You must have the ffmpeg or avconv executable in your path environment
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variable in order for this to work.
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Parameters
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------------
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source: Union[:class:`str`, :class:`io.BufferedIOBase`]
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The input that ffmpeg will take and convert to PCM bytes.
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If ``pipe`` is ``True`` then this is a file-like object that is
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passed to the stdin of ffmpeg.
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executable: :class:`str`
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The executable name (and path) to use. Defaults to ``ffmpeg``.
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pipe: :class:`bool`
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If ``True``, denotes that ``source`` parameter will be passed
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to the stdin of ffmpeg. Defaults to ``False``.
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stderr: Optional[:term:`py:file object`]
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A file-like object to pass to the Popen constructor.
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Could also be an instance of ``subprocess.PIPE``.
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before_options: Optional[:class:`str`]
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Extra command line arguments to pass to ffmpeg before the ``-i`` flag.
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options: Optional[:class:`str`]
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Extra command line arguments to pass to ffmpeg after the ``-i`` flag.
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Raises
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--------
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ClientException
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The subprocess failed to be created.
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"""
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def __init__(self, source, *, executable='ffmpeg', pipe=False, stderr=None, before_options=None, options=None):
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args = []
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subprocess_kwargs = {'stdin': source if pipe else subprocess.DEVNULL, 'stderr': stderr}
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if isinstance(before_options, str):
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args.extend(shlex.split(before_options))
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args.append('-i')
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args.append('-' if pipe else source)
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args.extend(('-f', 's16le', '-ar', '48000', '-ac', '2', '-loglevel', 'warning'))
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if isinstance(options, str):
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args.extend(shlex.split(options))
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args.append('pipe:1')
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super().__init__(source, executable=executable, args=args, **subprocess_kwargs)
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def read(self):
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ret = self._stdout.read(OpusEncoder.FRAME_SIZE)
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if len(ret) != OpusEncoder.FRAME_SIZE:
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return b''
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return ret
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def is_opus(self):
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return False
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class FFmpegOpusAudio(FFmpegAudio):
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"""An audio source from FFmpeg (or AVConv).
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This launches a sub-process to a specific input file given. However, rather than
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producing PCM packets like :class:`FFmpegPCMAudio` does that need to be encoded to
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Opus, this class produces Opus packets, skipping the encoding step done by the library.
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Alternatively, instead of instantiating this class directly, you can use
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:meth:`FFmpegOpusAudio.from_probe` to probe for bitrate and codec information. This
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can be used to opportunistically skip pointless re-encoding of existing Opus audio data
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for a boost in performance at the cost of a short initial delay to gather the information.
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The same can be achieved by passing ``copy`` to the ``codec`` parameter, but only if you
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know that the input source is Opus encoded beforehand.
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.. versionadded:: 1.3
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.. warning::
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You must have the ffmpeg or avconv executable in your path environment
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variable in order for this to work.
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Parameters
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------------
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source: Union[:class:`str`, :class:`io.BufferedIOBase`]
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The input that ffmpeg will take and convert to Opus bytes.
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If ``pipe`` is ``True`` then this is a file-like object that is
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passed to the stdin of ffmpeg.
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bitrate: :class:`int`
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The bitrate in kbps to encode the output to. Defaults to ``128``.
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codec: Optional[:class:`str`]
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The codec to use to encode the audio data. Normally this would be
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just ``libopus``, but is used by :meth:`FFmpegOpusAudio.from_probe` to
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opportunistically skip pointlessly re-encoding Opus audio data by passing
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``copy`` as the codec value. Any values other than ``copy``, ``opus``, or
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``libopus`` will be considered ``libopus``. Defaults to ``libopus``.
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.. warning::
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Do not provide this parameter unless you are certain that the audio input is
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already Opus encoded. For typical use :meth:`FFmpegOpusAudio.from_probe`
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should be used to determine the proper value for this parameter.
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executable: :class:`str`
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The executable name (and path) to use. Defaults to ``ffmpeg``.
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pipe: :class:`bool`
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If ``True``, denotes that ``source`` parameter will be passed
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to the stdin of ffmpeg. Defaults to ``False``.
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stderr: Optional[:term:`py:file object`]
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A file-like object to pass to the Popen constructor.
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Could also be an instance of ``subprocess.PIPE``.
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before_options: Optional[:class:`str`]
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Extra command line arguments to pass to ffmpeg before the ``-i`` flag.
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options: Optional[:class:`str`]
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Extra command line arguments to pass to ffmpeg after the ``-i`` flag.
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Raises
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--------
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ClientException
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The subprocess failed to be created.
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"""
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def __init__(self, source, *, bitrate=128, codec=None, executable='ffmpeg',
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pipe=False, stderr=None, before_options=None, options=None):
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args = []
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subprocess_kwargs = {'stdin': source if pipe else subprocess.DEVNULL, 'stderr': stderr}
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if isinstance(before_options, str):
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args.extend(shlex.split(before_options))
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args.append('-i')
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args.append('-' if pipe else source)
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codec = 'copy' if codec in ('opus', 'libopus') else 'libopus'
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args.extend(('-map_metadata', '-1',
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'-f', 'opus',
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'-c:a', codec,
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'-ar', '48000',
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'-ac', '2',
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'-b:a', '%sk' % bitrate,
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'-loglevel', 'warning'))
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if isinstance(options, str):
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args.extend(shlex.split(options))
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args.append('pipe:1')
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super().__init__(source, executable=executable, args=args, **subprocess_kwargs)
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self._packet_iter = OggStream(self._stdout).iter_packets()
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@classmethod
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async def from_probe(cls, source, *, method=None, **kwargs):
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"""|coro|
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A factory method that creates a :class:`FFmpegOpusAudio` after probing
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the input source for audio codec and bitrate information.
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Examples
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----------
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Use this function to create an :class:`FFmpegOpusAudio` instance instead of the constructor: ::
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source = await discord.FFmpegOpusAudio.from_probe("song.webm")
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voice_client.play(source)
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If you are on Windows and don't have ffprobe installed, use the ``fallback`` method
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to probe using ffmpeg instead: ::
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source = await discord.FFmpegOpusAudio.from_probe("song.webm", method='fallback')
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voice_client.play(source)
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Using a custom method of determining codec and bitrate: ::
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def custom_probe(source, executable):
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# some analysis code here
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return codec, bitrate
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source = await discord.FFmpegOpusAudio.from_probe("song.webm", method=custom_probe)
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voice_client.play(source)
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Parameters
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------------
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source
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Identical to the ``source`` parameter for the constructor.
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method: Optional[Union[:class:`str`, Callable[:class:`str`, :class:`str`]]]
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The probing method used to determine bitrate and codec information. As a string, valid
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values are ``native`` to use ffprobe (or avprobe) and ``fallback`` to use ffmpeg
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(or avconv). As a callable, it must take two string arguments, ``source`` and
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``executable``. Both parameters are the same values passed to this factory function.
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``executable`` will default to ``ffmpeg`` if not provided as a keyword argument.
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kwargs
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The remaining parameters to be passed to the :class:`FFmpegOpusAudio` constructor,
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excluding ``bitrate`` and ``codec``.
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Raises
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--------
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AttributeError
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Invalid probe method, must be ``'native'`` or ``'fallback'``.
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TypeError
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Invalid value for ``probe`` parameter, must be :class:`str` or a callable.
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Returns
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--------
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:class:`FFmpegOpusAudio`
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An instance of this class.
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"""
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executable = kwargs.get('executable')
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codec, bitrate = await cls.probe(source, method=method, executable=executable)
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return cls(source, bitrate=bitrate, codec=codec, **kwargs)
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@classmethod
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async def probe(cls, source, *, method=None, executable=None):
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"""|coro|
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Probes the input source for bitrate and codec information.
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Parameters
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------------
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source
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Identical to the ``source`` parameter for :class:`FFmpegOpusAudio`.
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method
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Identical to the ``method`` parameter for :meth:`FFmpegOpusAudio.from_probe`.
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executable: :class:`str`
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Identical to the ``executable`` parameter for :class:`FFmpegOpusAudio`.
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Raises
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--------
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AttributeError
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Invalid probe method, must be ``'native'`` or ``'fallback'``.
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TypeError
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Invalid value for ``probe`` parameter, must be :class:`str` or a callable.
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Returns
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---------
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Tuple[Optional[:class:`str`], Optional[:class:`int`]]
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A 2-tuple with the codec and bitrate of the input source.
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"""
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method = method or 'native'
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executable = executable or 'ffmpeg'
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probefunc = fallback = None
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if isinstance(method, str):
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probefunc = getattr(cls, '_probe_codec_' + method, None)
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if probefunc is None:
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raise AttributeError("Invalid probe method '%s'" % method)
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if probefunc is cls._probe_codec_native:
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fallback = cls._probe_codec_fallback
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elif callable(method):
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probefunc = method
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fallback = cls._probe_codec_fallback
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else:
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raise TypeError("Expected str or callable for parameter 'probe', " \
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"not '{0.__class__.__name__}'" .format(method))
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codec = bitrate = None
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loop = asyncio.get_event_loop()
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try:
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codec, bitrate = await loop.run_in_executor(None, lambda: probefunc(source, executable))
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except Exception:
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if not fallback:
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log.exception("Probe '%s' using '%s' failed", method, executable)
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return
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log.exception("Probe '%s' using '%s' failed, trying fallback", method, executable)
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try:
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codec, bitrate = await loop.run_in_executor(None, lambda: fallback(source, executable))
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except Exception:
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log.exception("Fallback probe using '%s' failed", executable)
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else:
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log.info("Fallback probe found codec=%s, bitrate=%s", codec, bitrate)
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else:
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log.info("Probe found codec=%s, bitrate=%s", codec, bitrate)
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finally:
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return codec, bitrate
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@staticmethod
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def _probe_codec_native(source, executable='ffmpeg'):
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exe = executable[:2] + 'probe' if executable in ('ffmpeg', 'avconv') else executable
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args = [exe, '-v', 'quiet', '-print_format', 'json', '-show_streams', '-select_streams', 'a:0', source]
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output = subprocess.check_output(args, timeout=20)
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codec = bitrate = None
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if output:
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data = json.loads(output)
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streamdata = data['streams'][0]
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codec = streamdata.get('codec_name')
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bitrate = int(streamdata.get('bit_rate', 0))
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bitrate = max(round(bitrate/1000, 0), 512)
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return codec, bitrate
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@staticmethod
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def _probe_codec_fallback(source, executable='ffmpeg'):
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args = [executable, '-hide_banner', '-i', source]
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proc = subprocess.Popen(args, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
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out, _ = proc.communicate(timeout=20)
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output = out.decode('utf8')
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codec = bitrate = None
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codec_match = re.search(r"Stream #0.*?Audio: (\w+)", output)
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if codec_match:
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codec = codec_match.group(1)
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br_match = re.search(r"(\d+) [kK]b/s", output)
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if br_match:
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bitrate = max(int(br_match.group(1)), 512)
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return codec, bitrate
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def read(self):
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return next(self._packet_iter, b'')
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def is_opus(self):
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return True
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class PCMVolumeTransformer(AudioSource):
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"""Transforms a previous :class:`AudioSource` to have volume controls.
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This does not work on audio sources that have :meth:`AudioSource.is_opus`
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set to ``True``.
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Parameters
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------------
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original: :class:`AudioSource`
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The original AudioSource to transform.
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volume: :class:`float`
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The initial volume to set it to.
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See :attr:`volume` for more info.
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Raises
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-------
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TypeError
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Not an audio source.
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ClientException
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The audio source is opus encoded.
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"""
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def __init__(self, original, volume=1.0):
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if not isinstance(original, AudioSource):
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raise TypeError('expected AudioSource not {0.__class__.__name__}.'.format(original))
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if original.is_opus():
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raise ClientException('AudioSource must not be Opus encoded.')
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self.original = original
|
|
self.volume = volume
|
|
|
|
@property
|
|
def volume(self):
|
|
"""Retrieves or sets the volume as a floating point percentage (e.g. ``1.0`` for 100%)."""
|
|
return self._volume
|
|
|
|
@volume.setter
|
|
def volume(self, value):
|
|
self._volume = max(value, 0.0)
|
|
|
|
def cleanup(self):
|
|
self.original.cleanup()
|
|
|
|
def read(self):
|
|
ret = self.original.read()
|
|
return audioop.mul(ret, 2, min(self._volume, 2.0))
|
|
|
|
class AudioPlayer(threading.Thread):
|
|
DELAY = OpusEncoder.FRAME_LENGTH / 1000.0
|
|
|
|
def __init__(self, source, client, *, after=None):
|
|
threading.Thread.__init__(self)
|
|
self.daemon = True
|
|
self.source = source
|
|
self.client = client
|
|
self.after = after
|
|
|
|
self._end = threading.Event()
|
|
self._resumed = threading.Event()
|
|
self._resumed.set() # we are not paused
|
|
self._current_error = None
|
|
self._connected = client._connected
|
|
self._lock = threading.Lock()
|
|
|
|
if after is not None and not callable(after):
|
|
raise TypeError('Expected a callable for the "after" parameter.')
|
|
|
|
def _do_run(self):
|
|
self.loops = 0
|
|
self._start = time.perf_counter()
|
|
|
|
# getattr lookup speed ups
|
|
play_audio = self.client.send_audio_packet
|
|
self._speak(True)
|
|
|
|
while not self._end.is_set():
|
|
# are we paused?
|
|
if not self._resumed.is_set():
|
|
# wait until we aren't
|
|
self._resumed.wait()
|
|
continue
|
|
|
|
# are we disconnected from voice?
|
|
if not self._connected.is_set():
|
|
# wait until we are connected
|
|
self._connected.wait()
|
|
# reset our internal data
|
|
self.loops = 0
|
|
self._start = time.perf_counter()
|
|
|
|
self.loops += 1
|
|
data = self.source.read()
|
|
|
|
if not data:
|
|
self.stop()
|
|
break
|
|
|
|
play_audio(data, encode=not self.source.is_opus())
|
|
next_time = self._start + self.DELAY * self.loops
|
|
delay = max(0, self.DELAY + (next_time - time.perf_counter()))
|
|
time.sleep(delay)
|
|
|
|
def run(self):
|
|
try:
|
|
self._do_run()
|
|
except Exception as exc:
|
|
self._current_error = exc
|
|
self.stop()
|
|
finally:
|
|
self.source.cleanup()
|
|
self._call_after()
|
|
|
|
def _call_after(self):
|
|
error = self._current_error
|
|
|
|
if self.after is not None:
|
|
try:
|
|
self.after(error)
|
|
except Exception as exc:
|
|
log.exception('Calling the after function failed.')
|
|
exc.__context__ = error
|
|
traceback.print_exception(type(exc), exc, exc.__traceback__)
|
|
elif error:
|
|
msg = 'Exception in voice thread {}'.format(self.name)
|
|
log.exception(msg, exc_info=error)
|
|
print(msg, file=sys.stderr)
|
|
traceback.print_exception(type(error), error, error.__traceback__)
|
|
|
|
def stop(self):
|
|
self._end.set()
|
|
self._resumed.set()
|
|
self._speak(False)
|
|
|
|
def pause(self, *, update_speaking=True):
|
|
self._resumed.clear()
|
|
if update_speaking:
|
|
self._speak(False)
|
|
|
|
def resume(self, *, update_speaking=True):
|
|
self.loops = 0
|
|
self._start = time.perf_counter()
|
|
self._resumed.set()
|
|
if update_speaking:
|
|
self._speak(True)
|
|
|
|
def is_playing(self):
|
|
return self._resumed.is_set() and not self._end.is_set()
|
|
|
|
def is_paused(self):
|
|
return not self._end.is_set() and not self._resumed.is_set()
|
|
|
|
def _set_source(self, source):
|
|
with self._lock:
|
|
self.pause(update_speaking=False)
|
|
self.source = source
|
|
self.resume(update_speaking=False)
|
|
|
|
def _speak(self, speaking):
|
|
try:
|
|
asyncio.run_coroutine_threadsafe(self.client.ws.speak(speaking), self.client.loop)
|
|
except Exception as e:
|
|
log.info("Speaking call in player failed: %s", e)
|