Discord.Net/docs/guides/voice/sending-voice.md

uid, title

uid	title
Guides.Voice.SendingVoice	Sending Voice

Information on this page is subject to change!

Warning

This article is out of date, and has not been rewritten yet. Information is not guaranteed to be accurate.

Installing

Audio requires two native libraries, libsodium and opus. Both of these libraries must be placed in the runtime directory of your bot. (When developing on .NET Framework, this would be bin/debug, when developing on .NET Core, this is where you execute dotnet run from; typically the same directory as your csproj).

For Windows Users, precompiled binaries are available for your convienence here.

For Linux Users, you will need to compile Sodium and Opus from source, or install them from your package manager.

Joining a Channel

Joining a channel is the first step to sending audio, and will return an IAudioClient to send data with.

To join a channel, simply await ConnectAsync on any instance of an @Discord.IAudioChannel.

[!code-csharpJoining a Channel]

The client will sustain a connection to this channel until it is kicked, disconnected from Discord, or told to disconnect.

It should be noted that voice connections are created on a per-guild basis; only one audio connection may be open by the bot in a single guild. To switch channels within a guild, invoke ConnectAsync on another voice channel in the guild.

Transmitting Audio

With FFmpeg

FFmpeg is an open source, highly versatile AV-muxing tool. This is the recommended method of transmitting audio.

Before you begin, you will need to have a version of FFmpeg downloaded and placed somewhere in your PATH (or alongside the bot, in the same location as libsodium and opus). Windows binaries are available on FFmpeg's download page.

First, you will need to create a Process that starts FFmpeg. An example of how to do this is included below, though it is important that you return PCM at 48000hz.

Note

As of the time of this writing, Discord.Audio struggles significantly with processing audio that is already opus-encoded; you will need to use the PCM write streams.

[!code-csharpCreating FFmpeg]

Next, to transmit audio from FFmpeg to Discord, you will need to pull an AudioOutStream from your IAudioClient. Since we're using PCM audio, use IAudioClient.CreatePCMStream.

The sample rate argument doesn't particularly matter, so long as it is a valid rate (120, 240, 480, 960, 1920, or 2880). For the sake of simplicity, I recommend using 1920.

Channels should be left at 2, unless you specified a different value for -ac 2 when creating FFmpeg.

Finally, audio will need to be piped from FFmpeg's stdout into your AudioOutStream. This step can be as complex as you'd like it to be, but for the majority of cases, you can just use Stream.CopyToAsync, as shown below.

If you are implementing a queue for sending songs, it's likely that you will want to wait for audio to stop playing before continuing on to the next song. You can await AudioOutStream.FlushAsync to wait for the audio client's internal buffer to clear out.

[!code-csharpSending Audio]