# -*- coding: utf-8 -*-
"""
The MIT License (MIT)
Copyright (c) 2015-2017 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.
"""
"""Some documentation to refer to:
- Our main web socket (mWS) sends opcode 4 with a guild ID and channel ID.
- The mWS receives VOICE_STATE_UPDATE and VOICE_SERVER_UPDATE.
- We pull the session_id from VOICE_STATE_UPDATE.
- We pull the token, endpoint and guild_id from VOICE_SERVER_UPDATE.
- Then we initiate the voice web socket (vWS) pointing to the endpoint.
- We send opcode 0 with the user_id, guild_id, session_id and token using the vWS.
- The vWS sends back opcode 2 with an ssrc, port, modes(array) and hearbeat_interval.
- We send a UDP discovery packet to endpoint:port and receive our IP and our port in LE.
- Then we send our IP and port via vWS with opcode 1.
- When that's all done, we receive opcode 4 from the vWS.
- Finally we can transmit data to endpoint:port.
"""
import asyncio
import websockets
import socket
import json, time
import logging
import struct
import threading
import subprocess
import shlex
import functools
import datetime
import audioop
import inspect
log = logging.getLogger(__name__)
try:
import nacl.secret
has_nacl = True
except ImportError:
has_nacl = False
from . import opus
from .gateway import *
from .errors import ClientException, InvalidArgument, ConnectionClosed
class StreamPlayer(threading.Thread):
def __init__(self, stream, encoder, connected, player, after, **kwargs):
threading.Thread.__init__(self, **kwargs)
self.daemon = True
self.buff = stream
self.frame_size = encoder.frame_size
self.player = player
self._end = threading.Event()
self._resumed = threading.Event()
self._resumed.set() # we are not paused
self._connected = connected
self.after = after
self.delay = encoder.frame_length / 1000.0
self._volume = 1.0
self._current_error = None
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.time()
while not self._end.is_set():
# are we paused?
if not self._resumed.is_set():
# wait until we aren't
self._resumed.wait()
if not self._connected.is_set():
self.stop()
break
self.loops += 1
data = self.buff.read(self.frame_size)
if self._volume != 1.0:
data = audioop.mul(data, 2, min(self._volume, 2.0))
if len(data) != self.frame_size:
self.stop()
break
self.player(data)
next_time = self._start + self.delay * self.loops
delay = max(0, self.delay + (next_time - time.time()))
time.sleep(delay)
def run(self):
try:
self._do_run()
except Exception as e:
self._current_error = e
self.stop()
def stop(self):
self._end.set()
if self.after is not None:
try:
arg_count = len(inspect.signature(self.after).parameters)
except:
# if this ended up happening, a mistake was made.
arg_count = 0
try:
if arg_count == 0:
self.after()
else:
self.after(self)
except:
pass
@property
def error(self):
return self._current_error
@property
def volume(self):
return self._volume
@volume.setter
def volume(self, value):
self._volume = max(value, 0.0)
def pause(self):
self._resumed.clear()
def resume(self):
self.loops = 0
self._start = time.time()
self._resumed.set()
def is_playing(self):
return self._resumed.is_set() and not self.is_done()
def is_done(self):
return not self._connected.is_set() or self._end.is_set()
class ProcessPlayer(StreamPlayer):
def __init__(self, process, client, after, **kwargs):
super().__init__(process.stdout, client.encoder,
client._connected, client.play_audio, after, **kwargs)
self.process = process
def run(self):
super().run()
self.process.kill()
if self.process.poll() is None:
self.process.communicate()
class VoiceClient:
"""Represents a Discord voice connection.
This client is created solely through :meth:`Client.join_voice_channel`
and its only purpose is to transmit voice.
Warning
--------
In order to play audio, you must have loaded the opus library
through :func:`opus.load_opus`.
If you don't do this then the library will not be able to
transmit audio.
Attributes
-----------
session_id : str
The voice connection session ID.
token : str
The voice connection token.
user : :class:`User`
The user connected to voice.
endpoint : str
The endpoint we are connecting to.
channel : :class:`Channel`
The voice channel connected to.
guild : :class:`Guild`
The guild the voice channel is connected to.
Shorthand for ``channel.guild``.
loop
The event loop that the voice client is running on.
"""
def __init__(self, user, main_ws, session_id, channel, data, loop):
if not has_nacl:
raise RuntimeError("PyNaCl library needed in order to use voice")
self.user = user
self.main_ws = main_ws
self.channel = channel
self.session_id = session_id
self.loop = loop
self._connected = asyncio.Event(loop=self.loop)
self.token = data.get('token')
self.guild_id = data.get('guild_id')
self.endpoint = data.get('endpoint')
self.sequence = 0
self.timestamp = 0
self.encoder = opus.Encoder(48000, 2)
log.info('created opus encoder with {0.__dict__}'.format(self.encoder))
warn_nacl = not has_nacl
@property
def guild(self):
return self.channel.guild
def checked_add(self, attr, value, limit):
val = getattr(self, attr)
if val + value > limit:
setattr(self, attr, 0)
else:
setattr(self, attr, val + value)
# connection related
@asyncio.coroutine
def connect(self):
log.info('voice connection is connecting...')
self.endpoint = self.endpoint.replace(':80', '')
self.endpoint_ip = socket.gethostbyname(self.endpoint)
self.socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
self.socket.setblocking(False)
log.info('Voice endpoint found {0.endpoint} (IP: {0.endpoint_ip})'.format(self))
self.ws = yield from DiscordVoiceWebSocket.from_client(self)
while not self._connected.is_set():
yield from self.ws.poll_event()
if hasattr(self, 'secret_key'):
# we have a secret key, so we don't need to poll
# websocket events anymore
self._connected.set()
break
self.loop.create_task(self.poll_voice_ws())
@asyncio.coroutine
def poll_voice_ws(self):
"""|coro|
Reads from the voice websocket while connected.
"""
while self._connected.is_set():
try:
yield from self.ws.poll_event()
except ConnectionClosed as e:
if e.code == 1000:
break
else:
raise
@asyncio.coroutine
def disconnect(self):
"""|coro|
Disconnects all connections to the voice client.
In order to reconnect, you must create another voice client
using :meth:`Client.join_voice_channel`.
"""
if not self._connected.is_set():
return
self._connected.clear()
try:
yield from self.ws.close()
yield from self.main_ws.voice_state(self.guild_id, None, self_mute=True)
finally:
self.socket.close()
@asyncio.coroutine
def move_to(self, channel):
"""|coro|
Moves you to a different voice channel.
.. warning::
:class:`Object` instances do not work with this function.
Parameters
-----------
channel : :class:`Channel`
The channel to move to. Must be a voice channel.
Raises
-------
InvalidArgument
Not a voice channel.
"""
if str(getattr(channel, 'type', 'text')) != 'voice':
raise InvalidArgument('Must be a voice channel.')
yield from self.main_ws.voice_state(self.guild_id, channel.id)
def is_connected(self):
"""bool : Indicates if the voice client is connected to voice."""
return self._connected.is_set()
# audio related
def _get_voice_packet(self, data):
header = bytearray(12)
nonce = bytearray(24)
box = nacl.secret.SecretBox(bytes(self.secret_key))
# Formulate header
header[0] = 0x80
header[1] = 0x78
struct.pack_into('>H', header, 2, self.sequence)
struct.pack_into('>I', header, 4, self.timestamp)
struct.pack_into('>I', header, 8, self.ssrc)
# Copy header to nonce's first 12 bytes
nonce[:12] = header
# Encrypt and return the data
return header + box.encrypt(bytes(data), bytes(nonce)).ciphertext
def create_ffmpeg_player(self, filename, *, use_avconv=False, pipe=False, stderr=None, options=None, before_options=None, headers=None, after=None):
"""Creates a stream player for ffmpeg that launches in a separate thread to play
audio.
The ffmpeg player launches a subprocess of ``ffmpeg`` to a specific
filename and then plays that file.
You must have the ffmpeg or avconv executable in your path environment variable
in order for this to work.
The operations that can be done on the player are the same as those in
:meth:`create_stream_player`.
Examples
----------
Basic usage: ::
voice = yield from client.join_voice_channel(channel)
player = voice.create_ffmpeg_player('cool.mp3')
player.start()
Parameters
-----------
filename
The filename 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``.
use_avconv: bool
Use ``avconv`` instead of ``ffmpeg``.
pipe : bool
If true, denotes that ``filename`` parameter will be passed
to the stdin of ffmpeg.
stderr
A file-like object or ``subprocess.PIPE`` to pass to the Popen
constructor.
options : str
Extra command line flags to pass to ``ffmpeg`` after the ``-i`` flag.
before_options : str
Command line flags to pass to ``ffmpeg`` before the ``-i`` flag.
headers: dict
HTTP headers dictionary to pass to ``-headers`` command line option
after : callable
The finalizer that is called after the stream is done being
played. All exceptions the finalizer throws are silently discarded.
Raises
-------
ClientException
Popen failed to due to an error in ``ffmpeg`` or ``avconv``.
Returns
--------
StreamPlayer
A stream player with specific operations.
See :meth:`create_stream_player`.
"""
command = 'ffmpeg' if not use_avconv else 'avconv'
input_name = '-' if pipe else shlex.quote(filename)
before_args = ""
if isinstance(headers, dict):
for key, value in headers.items():
before_args += "{}: {}\r\n".format(key, value)
before_args = ' -headers ' + shlex.quote(before_args)
if isinstance(before_options, str):
before_args += ' ' + before_options
cmd = command + '{} -i {} -f s16le -ar {} -ac {} -loglevel warning'
cmd = cmd.format(before_args, input_name, self.encoder.sampling_rate, self.encoder.channels)
if isinstance(options, str):
cmd = cmd + ' ' + options
cmd += ' pipe:1'
stdin = None if not pipe else filename
args = shlex.split(cmd)
try:
p = subprocess.Popen(args, stdin=stdin, stdout=subprocess.PIPE, stderr=stderr)
return ProcessPlayer(p, self, after)
except FileNotFoundError as e:
raise ClientException('ffmpeg/avconv was not found in your PATH environment variable') from e
except subprocess.SubprocessError as e:
raise ClientException('Popen failed: {0.__name__} {1}'.format(type(e), str(e))) from e
@asyncio.coroutine
def create_ytdl_player(self, url, *, ytdl_options=None, **kwargs):
"""|coro|
Creates a stream player for youtube or other services that launches
in a separate thread to play the audio.
The player uses the ``youtube_dl`` python library to get the information
required to get audio from the URL. Since this uses an external library,
you must install it yourself. You can do so by calling
``pip install youtube_dl``.
You must have the ffmpeg or avconv executable in your path environment
variable in order for this to work.
The operations that can be done on the player are the same as those in
:meth:`create_stream_player`. The player has been augmented and enhanced
to have some info extracted from the URL. If youtube-dl fails to extract
the information then the attribute is ``None``. The ``yt``, ``url``, and
``download_url`` attributes are always available.
+---------------------+---------------------------------------------------------+
| Operation | Description |
+=====================+=========================================================+
| player.yt | The `YoutubeDL <ytdl>` instance. |
+---------------------+---------------------------------------------------------+
| player.url | The URL that is currently playing. |
+---------------------+---------------------------------------------------------+
| player.download_url | The URL that is currently being downloaded to ffmpeg. |
+---------------------+---------------------------------------------------------+
| player.title | The title of the audio stream. |
+---------------------+---------------------------------------------------------+
| player.description | The description of the audio stream. |
+---------------------+---------------------------------------------------------+
| player.uploader | The uploader of the audio stream. |
+---------------------+---------------------------------------------------------+
| player.upload_date | A datetime.date object of when the stream was uploaded. |
+---------------------+---------------------------------------------------------+
| player.duration | The duration of the audio in seconds. |
+---------------------+---------------------------------------------------------+
| player.likes | How many likes the audio stream has. |
+---------------------+---------------------------------------------------------+
| player.dislikes | How many dislikes the audio stream has. |
+---------------------+---------------------------------------------------------+
| player.is_live | Checks if the audio stream is currently livestreaming. |
+---------------------+---------------------------------------------------------+
| player.views | How many views the audio stream has. |
+---------------------+---------------------------------------------------------+
.. _ytdl: https://github.com/rg3/youtube-dl/blob/master/youtube_dl/YoutubeDL.py#L128-L278
Examples
----------
Basic usage: ::
voice = await client.join_voice_channel(channel)
player = await voice.create_ytdl_player('https://www.youtube.com/watch?v=d62TYemN6MQ')
player.start()
Parameters
-----------
url : str
The URL that ``youtube_dl`` will take and download audio to pass
to ``ffmpeg`` or ``avconv`` to convert to PCM bytes.
ytdl_options : dict
A dictionary of options to pass into the ``YoutubeDL`` instance.
See `the documentation <ytdl>`_ for more details.
\*\*kwargs
The rest of the keyword arguments are forwarded to
:func:`create_ffmpeg_player`.
Raises
-------
ClientException
Popen failure from either ``ffmpeg``/``avconv``.
Returns
--------
StreamPlayer
An augmented StreamPlayer that uses ffmpeg.
See :meth:`create_stream_player` for base operations.
"""
import youtube_dl
use_avconv = kwargs.get('use_avconv', False)
opts = {
'format': 'webm[abr>0]/bestaudio/best',
'prefer_ffmpeg': not use_avconv
}
if ytdl_options is not None and isinstance(ytdl_options, dict):
opts.update(ytdl_options)
ydl = youtube_dl.YoutubeDL(opts)
func = functools.partial(ydl.extract_info, url, download=False)
info = yield from self.loop.run_in_executor(None, func)
if "entries" in info:
info = info['entries'][0]
log.info('playing URL {}'.format(url))
download_url = info['url']
player = self.create_ffmpeg_player(download_url, **kwargs)
# set the dynamic attributes from the info extraction
player.download_url = download_url
player.url = url
player.yt = ydl
player.views = info.get('view_count')
player.is_live = bool(info.get('is_live'))
player.likes = info.get('like_count')
player.dislikes = info.get('dislike_count')
player.duration = info.get('duration')
player.uploader = info.get('uploader')
is_twitch = 'twitch' in url
if is_twitch:
# twitch has 'title' and 'description' sort of mixed up.
player.title = info.get('description')
player.description = None
else:
player.title = info.get('title')
player.description = info.get('description')
# upload date handling
date = info.get('upload_date')
if date:
try:
date = datetime.datetime.strptime(date, '%Y%M%d').date()
except ValueError:
date = None
player.upload_date = date
return player
def encoder_options(self, *, sample_rate, channels=2):
"""Sets the encoder options for the OpusEncoder.
Calling this after you create a stream player
via :meth:`create_ffmpeg_player` or :meth:`create_stream_player`
has no effect.
Parameters
----------
sample_rate : int
Sets the sample rate of the OpusEncoder. The unit is in Hz.
channels : int
Sets the number of channels for the OpusEncoder.
2 for stereo, 1 for mono.
Raises
-------
InvalidArgument
The values provided are invalid.
"""
if sample_rate not in (8000, 12000, 16000, 24000, 48000):
raise InvalidArgument('Sample rate out of range. Valid: [8000, 12000, 16000, 24000, 48000]')
if channels not in (1, 2):
raise InvalidArgument('Channels must be either 1 or 2.')
self.encoder = opus.Encoder(sample_rate, channels)
log.info('created opus encoder with {0.__dict__}'.format(self.encoder))
def create_stream_player(self, stream, *, after=None):
"""Creates a stream player that launches in a separate thread to
play audio.
The stream player assumes that ``stream.read`` is a valid function
that returns a *bytes-like* object.
The finalizer, ``after`` is called after the stream has been exhausted
or an error occurred (see below).
The following operations are valid on the ``StreamPlayer`` object:
+---------------------+-----------------------------------------------------+
| Operation | Description |
+=====================+=====================================================+
| player.start() | Starts the audio stream. |
+---------------------+-----------------------------------------------------+
| player.stop() | Stops the audio stream. |
+---------------------+-----------------------------------------------------+
| player.is_done() | Returns a bool indicating if the stream is done. |
+---------------------+-----------------------------------------------------+
| player.is_playing() | Returns a bool indicating if the stream is playing. |
+---------------------+-----------------------------------------------------+
| player.pause() | Pauses the audio stream. |
+---------------------+-----------------------------------------------------+
| player.resume() | Resumes the audio stream. |
+---------------------+-----------------------------------------------------+
| player.volume | Allows you to set the volume of the stream. 1.0 is |
| | equivalent to 100% and 0.0 is equal to 0%. The |
| | maximum the volume can be set to is 2.0 for 200%. |
+---------------------+-----------------------------------------------------+
| player.error | The exception that stopped the player. If no error |
| | happened, then this returns None. |
+---------------------+-----------------------------------------------------+
The stream must have the same sampling rate as the encoder and the same
number of channels. The defaults are 48000 Hz and 2 channels. You
could change the encoder options by using :meth:`encoder_options`
but this must be called **before** this function.
If an error happens while the player is running, the exception is caught and
the player is then stopped. The caught exception could then be retrieved
via ``player.error``\. When the player is stopped in this matter, the
finalizer under ``after`` is called.
Parameters
-----------
stream
The stream object to read from.
after
The finalizer that is called after the stream is exhausted.
All exceptions it throws are silently discarded. This function
can have either no parameters or a single parameter taking in the
current player.
Returns
--------
StreamPlayer
A stream player with the operations noted above.
"""
return StreamPlayer(stream, self.encoder, self._connected, self.play_audio, after)
def play_audio(self, data, *, encode=True):
"""Sends an audio packet composed of the data.
You must be connected to play audio.
Parameters
----------
data : bytes
The *bytes-like object* denoting PCM or Opus voice data.
encode : bool
Indicates if ``data`` should be encoded into Opus.
Raises
-------
ClientException
You are not connected.
OpusError
Encoding the data failed.
"""
self.checked_add('sequence', 1, 65535)
if encode:
encoded_data = self.encoder.encode(data, self.encoder.samples_per_frame)
else:
encoded_data = data
packet = self._get_voice_packet(encoded_data)
try:
sent = self.socket.sendto(packet, (self.endpoint_ip, self.voice_port))
except BlockingIOError:
log.warning('A packet has been dropped (seq: {0.sequence}, timestamp: {0.timestamp})'.format(self))
self.checked_add('timestamp', self.encoder.samples_per_frame, 4294967295)