Implements a discord voice connection. Each discord_voice_client connects to one voice channel and derives from a websocket client. More...

#include <discordvoiceclient.h>

Inheritance diagram for dpp::discord_voice_client:

Collaboration diagram for dpp::discord_voice_client:

Public Member Functions
virtual void	log (dpp::loglevel severity, const std::string &msg) const

virtual void	one_second_timer ()
	Fires every second from the underlying socket I/O loop, used for sending heartbeats. More...

bool	is_ready ()
	voice client is ready to stream audio. The voice client is considered ready if it has a secret key. More...

bool	is_connected ()
	Returns true if the voice client is connected to the websocket. More...

dpp::utility::uptime	get_uptime ()
	Returns the connection time of the voice client. More...

	discord_voice_client (dpp::cluster *_cluster, snowflake _channel_id, snowflake _server_id, const std::string &_token, const std::string &_session_id, const std::string &_host)

virtual	~discord_voice_client ()

virtual bool	handle_frame (const std::string &buffer)

virtual void	error (uint32_t errorcode)

void	run ()

discord_voice_client &	send_audio_raw (uint16_t *audio_data, const size_t length)
	Send raw audio to the voice channel. More...

discord_voice_client &	send_audio_opus (uint8_t *opus_packet, const size_t length, uint64_t duration)
	Send opus packets to the voice channel. More...

discord_voice_client &	send_audio_opus (uint8_t *opus_packet, const size_t length)
	Send opus packets to the voice channel. More...

discord_voice_client &	send_silence (const uint64_t duration)
	Send silence to the voice channel. More...

discord_voice_client &	set_timescale (uint64_t new_timescale)
	Set the timescale in nanoseconds. More...

uint64_t	get_timescale ()
	Get the current timescale, this will default to 1000000 which means 1 millisecond. More...

discord_voice_client &	speak ()
	Mark the voice connection as 'speaking'. This sends a JSON message to the voice websocket which tells discord that the user is speaking. The library automatically calls this for you whenever you send audio. More...

void	pause_audio (bool pause)
	Pause sending of audio. More...

void	stop_audio ()
	Immediately stop all audio. Clears the packet queue. More...

bool	is_playing ()
	Returns true if we are playing audio. More...

float	get_secs_remaining ()
	Get the number of seconds remaining of the audio output buffer. More...

uint32_t	get_tracks_remaining ()
	Get the number of tracks remaining in the output buffer. This is calculated by the number of track markers plus one. More...

dpp::utility::uptime	get_remaining ()
	Get the time remaining to send the audio output buffer in hours:minutes:seconds. More...

void	insert_marker (const std::string &metadata="")
	Insert a track marker into the audio output buffer. A track marker is an arbitrary flag in the buffer contents that indictes the end of some block of audio of significance to the sender. This may be a song from a streaming site, or some voice audio/speech, a sound effect, or whatever you choose. You can later skip to the next marker using the dpp::discord_voice_client::skip_to_next_marker function. More...

void	skip_to_next_marker ()
	Skip tp the next track marker, previously inserted by using the dpp::discord_voice_client::insert_marker function. If there are no markers in the output buffer, then this skips to the end of the buffer and is equivalent to the dpp::discord_voice_client::stop_audio function. More...

const std::vector< std::string >	get_marker_metadata ()
	Get the metdata string associated with each inserted marker. More...

bool	is_paused ()
	Returns true if the audio is paused. You can unpause with dpp::discord_voice_client::pause_audio. More...

std::string	discover_ip ()
	Discord external IP detection. More...

virtual void	write (const std::string &data)
	Write to websocket. Encapsulates data in frames if the status is CONNECTED. More...

virtual bool	handle_buffer (std::string &buffer)
	Processes incoming frames from the SSL socket input buffer. More...

virtual void	close ()
	Close websocket. More...

uint64_t	get_bytes_out ()

uint64_t	get_bytes_in ()

std::string	get_cipher ()

void	read_loop ()
	Nonblocking I/O loop. More...

Public Attributes
class dpp::cluster *	creator

bool	terminating

bool	decode_voice_recv

uint32_t	heartbeat_interval

time_t	last_heartbeat

std::thread::native_handle_type	thread_id

std::string	token

std::string	sessionid

snowflake	server_id

snowflake	channel_id

socket_callback_t	custom_readable_fd
	Attaching an additional file descriptor to this function will send notifications when there is data to read. More...

socket_callback_t	custom_writeable_fd
	Attaching an additional file descriptor to this function will send notifications when you are able to write to the socket. More...

socket_notification_t	custom_readable_ready
	This event will be called when you can read from the custom fd. More...

socket_notification_t	custom_writeable_ready
	This event will be called when you can write to a custom fd. More...

Static Public Attributes
static bool	sodium_initialised

Protected Member Functions
virtual void	connect ()

ws_state	get_state ()

Protected Attributes
std::string	buffer

std::string	obuffer

bool	nonblocking

dpp::socket	sfd

opensslcontext *	ssl

std::string	cipher

time_t	last_tick

std::string	hostname

uint64_t	bytes_out

uint64_t	bytes_in

Detailed Description

Implements a discord voice connection. Each discord_voice_client connects to one voice channel and derives from a websocket client.

Constructor & Destructor Documentation

◆ discord_voice_client()

dpp::discord_voice_client::discord_voice_client	(	dpp::cluster *	_cluster,
		snowflake	_channel_id,
		snowflake	_server_id,
		const std::string &	_token,
		const std::string &	_session_id,
		const std::string &	_host
	)

Constructor takes shard id, max shards and token.

Parameters

_cluster	The cluster which owns this voice connection, for related logging, REST requests etc
_channel_id	The channel id to identify the voice connection as
_server_id	The server id (guild id) to identify the voice connection as
_token	The voice session token to use for identifying to the websocket
_session_id	The voice session id to identify with
_host	The voice server hostname to connect to (hostname:port format)

Exceptions

dpp::exception Sodium or Opus failed to initialise

◆ ~discord_voice_client()

virtual dpp::discord_voice_client::~discord_voice_client ( )

virtual

Destructor

Member Function Documentation

◆ close()

virtual void dpp::websocket_client::close ( )

virtualinherited

Close websocket.

Reimplemented from dpp::ssl_client.

◆ connect()

virtual void dpp::websocket_client::connect ( )

protectedvirtualinherited

(Re)connect

Reimplemented from dpp::ssl_client.

◆ discover_ip()

std::string dpp::discord_voice_client::discover_ip ( )

Discord external IP detection.

Returns: std::string Your external IP address

Note: This is a blocking operation that waits for a single packet from Discord's voice servers.

◆ error()

virtual void dpp::discord_voice_client::error ( uint32_t errorcode )

virtual

Handle a websocket error.

Parameters

errorcode The error returned from the websocket

Reimplemented from dpp::websocket_client.

◆ get_bytes_in()

uint64_t dpp::ssl_client::get_bytes_in ( )

inherited

Get total bytes received

◆ get_bytes_out()

uint64_t dpp::ssl_client::get_bytes_out ( )

inherited

Get total bytes sent

◆ get_cipher()

std::string dpp::ssl_client::get_cipher ( )

inherited

Get SSL cipher name

◆ get_marker_metadata()

const std::vector< std::string > dpp::discord_voice_client::get_marker_metadata ( )

Get the metdata string associated with each inserted marker.

Returns: const std::vector<std::string>& list of metadata strings

◆ get_remaining()

dpp::utility::uptime dpp::discord_voice_client::get_remaining ( )

Get the time remaining to send the audio output buffer in hours:minutes:seconds.

Returns: dpp::utility::uptime length of buffer

◆ get_secs_remaining()

float dpp::discord_voice_client::get_secs_remaining ( )

Get the number of seconds remaining of the audio output buffer.

Returns: float number of seconds remaining

◆ get_state()

ws_state dpp::websocket_client::get_state ( )

protectedinherited

Get websocket state

Returns: websocket state

◆ get_timescale()

uint64_t dpp::discord_voice_client::get_timescale ( )

Get the current timescale, this will default to 1000000 which means 1 millisecond.

Returns: uint64_t timescale in nanoseconds

◆ get_tracks_remaining()

uint32_t dpp::discord_voice_client::get_tracks_remaining ( )

Get the number of tracks remaining in the output buffer. This is calculated by the number of track markers plus one.

Returns: uint32_t Number of tracks in the buffer

◆ get_uptime()

dpp::utility::uptime dpp::discord_voice_client::get_uptime ( )

Returns the connection time of the voice client.

Returns: dpp::utility::uptime Detail of how long the voice client has been connected for

◆ handle_buffer()

virtual bool dpp::websocket_client::handle_buffer ( std::string & buffer )

virtualinherited

Processes incoming frames from the SSL socket input buffer.

Parameters

buffer The buffer contents. Can modify this value removing the head elements when processed.

Reimplemented from dpp::ssl_client.

◆ handle_frame()

virtual bool dpp::discord_voice_client::handle_frame ( const std::string & buffer )

virtual

Handle JSON from the websocket.

Parameters

buffer The entire buffer content from the websocket client

Returns: bool True if a frame has been handled

Exceptions

dpp::exception If there was an error processing the frame, or connection to UDP socket failed

Reimplemented from dpp::websocket_client.

◆ insert_marker()

void dpp::discord_voice_client::insert_marker ( const std::string & metadata = "" )

Insert a track marker into the audio output buffer. A track marker is an arbitrary flag in the buffer contents that indictes the end of some block of audio of significance to the sender. This may be a song from a streaming site, or some voice audio/speech, a sound effect, or whatever you choose. You can later skip to the next marker using the dpp::discord_voice_client::skip_to_next_marker function.

Parameters

metadata Arbitrary information related to this track

◆ is_connected()

bool dpp::discord_voice_client::is_connected ( )

Returns true if the voice client is connected to the websocket.

Returns: True if connected

◆ is_paused()

bool dpp::discord_voice_client::is_paused ( )

Returns true if the audio is paused. You can unpause with dpp::discord_voice_client::pause_audio.

Returns: true if paused

◆ is_playing()

bool dpp::discord_voice_client::is_playing ( )

Returns true if we are playing audio.

Returns: true if audio is playing

◆ is_ready()

bool dpp::discord_voice_client::is_ready ( )

voice client is ready to stream audio. The voice client is considered ready if it has a secret key.

Returns: true if ready to stream audio

◆ log()

virtual void dpp::discord_voice_client::log	(	dpp::loglevel	severity,
		const std::string &	msg
	)		const

virtual

Log a message to whatever log the user is using. The logged message is passed up the chain to the on_log event in user code which can then do whatever it wants to do with it.

Parameters

severity	The log level from dpp::loglevel
msg	The log message to output

Reimplemented from dpp::ssl_client.

◆ one_second_timer()

virtual void dpp::discord_voice_client::one_second_timer ( )

virtual

Fires every second from the underlying socket I/O loop, used for sending heartbeats.

Exceptions

dpp::exception if the socket needs to disconnect

Reimplemented from dpp::websocket_client.

◆ pause_audio()

void dpp::discord_voice_client::pause_audio ( bool pause )

Pause sending of audio.

Parameters

pause True to pause, false to resume

◆ read_loop()

void dpp::ssl_client::read_loop ( )

inherited

Nonblocking I/O loop.

Exceptions

std::exception Any std::exception (or derivative) thrown from read_loop() causes reconnection of the shard

◆ run()

void dpp::discord_voice_client::run ( )

Start and monitor I/O loop

◆ send_audio_opus() [1/2]

discord_voice_client & dpp::discord_voice_client::send_audio_opus	(	uint8_t *	opus_packet,
		const size_t	length
	)

Send opus packets to the voice channel.

Some containers such as .ogg may contain OPUS encoded data already. In this case, we don't need to encode the frames using opus here. We can bypass the codec, only applying libsodium to the stream.

Duration is calculated internally

Parameters

opus_packet	Opus packets. Discord expects opus frames to be encoded at 48000Hz
length	The length of the audio data.

Returns: discord_voice_client& Reference to self

Note: It is your responsibility to ensure that packets of data sent to send_audio are correctly repacketized for streaming, e.g. that audio frames are not too large or contain an incorrect format. Discord will still expect the same frequency and bit width of audio and the same signedness.

Exceptions

dpp::exception If data length is invalid

◆ send_audio_opus() [2/2]

discord_voice_client & dpp::discord_voice_client::send_audio_opus	(	uint8_t *	opus_packet,
		const size_t	length,
		uint64_t	duration
	)

Send opus packets to the voice channel.

Some containers such as .ogg may contain OPUS encoded data already. In this case, we don't need to encode the frames using opus here. We can bypass the codec, only applying libsodium to the stream.

Parameters

opus_packet	Opus packets. Discord expects opus frames to be encoded at 48000Hz
length	The length of the audio data.
duration	Generally duration is 2.5, 5, 10, 20, 40 or 60 if the timescale is 1000000 (1ms)

Returns: discord_voice_client& Reference to self

Note: It is your responsibility to ensure that packets of data sent to send_audio are correctly repacketized for streaming, e.g. that audio frames are not too large or contain an incorrect format. Discord will still expect the same frequency and bit width of audio and the same signedness.

Exceptions

dpp::exception If data length is invalid

◆ send_audio_raw()

discord_voice_client & dpp::discord_voice_client::send_audio_raw	(	uint16_t *	audio_data,
		const size_t	length
	)

Send raw audio to the voice channel.

You should send an audio packet of n11520 bytes. Note that this function can be costly as it has to opus encode the PCM audio on the fly, and also encrypt it with libsodium.

Note: Because this function encrypts and encodes packets before pushing them onto the output queue, if you have a complete stream ready to send and know its length it is advisable to call this method multiple times to enqueue the entire stream audio so that it is all encoded at once (unless you have set use_opus to false). Constantly calling this from the dpp::on_voice_buffer_send callback can and will eat a TON of cpu!

Parameters

audio_data Raw PCM audio data. Channels are interleaved, with each channel's amplitude being a 16 bit value.

The audio data should be 48000Hz signed 16 bit audio.

Parameters

length The length of the audio data. The length should be a multiple of 4 (2x 16 bit stero channels) with a maximum length of 11520, which is a complete opus frame at highest quality.

Returns: discord_voice_client& Reference to self

Exceptions

dpp::exception If data length is invalid

◆ send_silence()

discord_voice_client & dpp::discord_voice_client::send_silence ( const uint64_t duration )

Send silence to the voice channel.

Parameters

duration How long to send silence for. With the standard timescale this is in milliseconds. Allowed values are 2.5, 5, 10, 20, 40 or 60 milliseconds.

Returns: discord_voice_client& Reference to self

◆ set_timescale()

discord_voice_client & dpp::discord_voice_client::set_timescale ( uint64_t new_timescale )

Set the timescale in nanoseconds.

Parameters

new_timescale Timescale to set. This defaults to 1000000, which means 1 millisecond.

Returns: discord_voice_client& Reference to self

Exceptions

dpp::exception If data length is invalid

◆ skip_to_next_marker()

void dpp::discord_voice_client::skip_to_next_marker ( )

Skip tp the next track marker, previously inserted by using the dpp::discord_voice_client::insert_marker function. If there are no markers in the output buffer, then this skips to the end of the buffer and is equivalent to the dpp::discord_voice_client::stop_audio function.

Note: It is possible to use this function while the output stream is paused.

◆ speak()

discord_voice_client & dpp::discord_voice_client::speak ( )

Mark the voice connection as 'speaking'. This sends a JSON message to the voice websocket which tells discord that the user is speaking. The library automatically calls this for you whenever you send audio.

Returns: discord_voice_client& Reference to self

◆ stop_audio()

void dpp::discord_voice_client::stop_audio ( )

Immediately stop all audio. Clears the packet queue.

◆ write()

virtual void dpp::websocket_client::write ( const std::string & data )

virtualinherited

Write to websocket. Encapsulates data in frames if the status is CONNECTED.

Parameters

data	The data to send.

Reimplemented from dpp::ssl_client.

Member Data Documentation

◆ buffer

std::string dpp::ssl_client::buffer

protectedinherited

Input buffer received from openssl

◆ bytes_in

uint64_t dpp::ssl_client::bytes_in

protectedinherited

Bytes in

◆ bytes_out

uint64_t dpp::ssl_client::bytes_out

protectedinherited

Bytes out

◆ channel_id

snowflake dpp::discord_voice_client::channel_id

Channel ID

◆ cipher

std::string dpp::ssl_client::cipher

protectedinherited

SSL cipher in use

◆ creator

class dpp::cluster* dpp::discord_voice_client::creator

Owning cluster

◆ custom_readable_fd

socket_callback_t dpp::ssl_client::custom_readable_fd

inherited

Attaching an additional file descriptor to this function will send notifications when there is data to read.

NOTE: Only hook this if you NEED it as it can increase CPU usage of the thread! Returning -1 means that you don't want to be notified.

◆ custom_readable_ready

socket_notification_t dpp::ssl_client::custom_readable_ready

inherited

This event will be called when you can read from the custom fd.

◆ custom_writeable_fd

socket_callback_t dpp::ssl_client::custom_writeable_fd

inherited

Attaching an additional file descriptor to this function will send notifications when you are able to write to the socket.

NOTE: Only hook this if you NEED it as it can increase CPU usage of the thread! You should toggle this to -1 when you do not have anything to write otherwise it'll keep triggering repeatedly (it is level triggered).

◆ custom_writeable_ready

socket_notification_t dpp::ssl_client::custom_writeable_ready

inherited

This event will be called when you can write to a custom fd.

◆ decode_voice_recv

bool dpp::discord_voice_client::decode_voice_recv

Decode received voice packets to PCM

◆ heartbeat_interval

uint32_t dpp::discord_voice_client::heartbeat_interval

Heartbeat interval for sending heartbeat keepalive

◆ hostname

std::string dpp::ssl_client::hostname

protectedinherited

Hostname connected to

◆ last_heartbeat

time_t dpp::discord_voice_client::last_heartbeat

Last heartbeat

◆ last_tick

time_t dpp::ssl_client::last_tick

protectedinherited

For timers

◆ nonblocking

bool dpp::ssl_client::nonblocking

protectedinherited

True if in nonblocking mode. The socket switches to nonblocking mode once ReadLoop is called.

◆ obuffer

std::string dpp::ssl_client::obuffer

protectedinherited

Output buffer for sending to openssl

◆ server_id

snowflake dpp::discord_voice_client::server_id

Server ID

◆ sessionid

std::string dpp::discord_voice_client::sessionid

Discord voice session id

◆ sfd

dpp::socket dpp::ssl_client::sfd

protectedinherited

Raw file descriptor of connection

◆ sodium_initialised

bool dpp::discord_voice_client::sodium_initialised

static

◆ ssl

opensslcontext* dpp::ssl_client::ssl

protectedinherited

Openssl opaque contexts

◆ terminating

bool dpp::discord_voice_client::terminating

True when the thread is shutting down

◆ thread_id

std::thread::native_handle_type dpp::discord_voice_client::thread_id

Thread ID

◆ token

std::string dpp::discord_voice_client::token

Discord voice session token

Public Member Functions

Public Attributes

Static Public Attributes

Protected Member Functions

Protected Attributes

Detailed Description

Constructor & Destructor Documentation

◆ discord_voice_client()

◆ ~discord_voice_client()

Member Function Documentation

◆ close()

◆ connect()

◆ discover_ip()

◆ error()

◆ get_bytes_in()

◆ get_bytes_out()

◆ get_cipher()

◆ get_marker_metadata()

◆ get_remaining()

◆ get_secs_remaining()

◆ get_state()

◆ get_timescale()

◆ get_tracks_remaining()

◆ get_uptime()

◆ handle_buffer()

◆ handle_frame()

◆ insert_marker()

◆ is_connected()

◆ is_paused()

◆ is_playing()

◆ is_ready()

◆ log()

◆ one_second_timer()

◆ pause_audio()

◆ read_loop()

◆ run()

◆ send_audio_opus() [1/2]

◆ send_audio_opus() [2/2]

◆ send_audio_raw()

◆ send_silence()

◆ set_timescale()

◆ skip_to_next_marker()

◆ speak()

◆ stop_audio()

◆ write()

Member Data Documentation

◆ buffer

◆ bytes_in

◆ bytes_out

◆ channel_id

◆ cipher

◆ creator

◆ custom_readable_fd

◆ custom_readable_ready

◆ custom_writeable_fd

◆ custom_writeable_ready

◆ decode_voice_recv

◆ heartbeat_interval

◆ hostname

◆ last_heartbeat

◆ last_tick

◆ nonblocking

◆ obuffer

◆ server_id

◆ sessionid

◆ sfd

◆ sodium_initialised

◆ ssl

◆ terminating

◆ thread_id

◆ token