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