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64 lines
4.6 KiB
Markdown
64 lines
4.6 KiB
Markdown
# Voice
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## Terminology
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* **Discord Gateway** - The standard Discord Gateway users connect to and receive update events from
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* **Discord Voice Gateway** - The Discord Voice gateway that allows voice connections to be configured
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* **Voice Server** - What the Discord Voice Gateway allows connection to for sending of Opus voice packets over UDP
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* **Voice Packet** - Opus encoded UDP packet that contains audio
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* **Application** - Could be a custom Discord Client or Bot (nothing that is within this package)
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* **Library** - Code within this package
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## Connection Flow
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* The **application** would get a new `*Voice` instance by calling `NewVoice()`
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* When the **application** wants to connect to a voice channel they would call `JoinChannel()` on
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the stored `*Voice` instance
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---
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* The **library** sends a [Voice State Update](https://discordapp.com/developers/docs/topics/voice-connections#retrieving-voice-server-information-gateway-voice-state-update-example)
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to the **Discord Gateway**.
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* The **library** waits until it receives a [Voice Server Update](https://discordapp.com/developers/docs/topics/voice-connections#retrieving-voice-server-information-example-voice-server-update-payload)
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from the **Discord Gateway**.
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* Once a *Voice Server Update* event is received, a new connection is opened to the **Discord Voice Gateway**.
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---
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* The **Discord Voice Gateway** will first send a [Hello Event](https://discordapp.com/developers/docs/topics/voice-connections#heartbeating-example-hello-payload-since-v3)
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which will be used to create a new `*heart.PacemakerLoop` and start sending heartbeats to the **Discord Voice Gateway**.
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* Afterwards, an [Identify Command](https://discordapp.com/developers/docs/topics/voice-connections#establishing-a-voice-websocket-connection-example-voice-identify-payload)
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or [Resume Command](https://discordapp.com/developers/docs/topics/voice-connections#resuming-voice-connection-example-resume-connection-payload)
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is sent to the **Discord Voice Gateway** depending on whether or not the **library** is reconnecting.
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---
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* The **Discord Voice Gateway** should then respond with a [Ready Event](https://discordapp.com/developers/docs/topics/voice-connections#establishing-a-voice-websocket-connection-example-voice-ready-payload)
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once the connection is opened, providing the required information to connect to a **Voice Server**.
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* Using the information provided in the *Ready Event*, a new UDP connection is opened to the **Voice Server**
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and [IP Discovery](https://discordapp.com/developers/docs/topics/voice-connections#ip-discovery) occurs.
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* After *IP Discovery* returns the **Application**'s external ip and port it connected to the **Voice Server**
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with, the **library** sends a [Select Protocol Event](https://discordapp.com/developers/docs/topics/voice-connections#establishing-a-voice-udp-connection-example-select-protocol-payload)
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to the **Discord Voice Gateway**.
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* The **library** waits until it receives a [Session Description Event](https://discordapp.com/developers/docs/topics/voice-connections#establishing-a-voice-udp-connection-example-session-description-payload)
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from the **Discord Voice Gateway**.
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* Once the *Session Description Event* is received, [Speaking Events](https://discordapp.com/developers/docs/topics/voice-connections#speaking-example-speaking-payload)
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and **Voice Packets** can begin to be sent to the **Discord Voice Gateway** and **Voice Server** respectively.
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## Usage
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* The **application** would get a new `*Voice` instance by calling `NewVoice()` and keep it
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stored for when it needs to open voice connections.
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* When the **application** wants to connect to a voice channel they would call `JoinChannel()` on
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the stored `*Voice` instance.
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* `JoinChannel()` will block as it follows the [Connection Flow](#connection-flow), returning an
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`error` if one occurs and a `*voice.Session` if it was successful.
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* The **application** should now call `(*voice.Session).Speaking()` with the wanted [voice flag](https://discordapp.com/developers/docs/topics/voice-connections#speaking)
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(`voicegateway.Microphone`, `voicegateway.Soundshare`, or `voicegateway.Priority`).
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* The **application** can now send **Voice Packets** using the `(*voice.Session).Write()` method
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which will be sent to the **Voice Server**. `(*voice.Session)` also implements `io.Writer`.
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* When the **application** wants to stop sending **Voice Packets** they should call
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`(*voice.Session).StopSpeaking()`, then any required voice cleanup (closing streams, etc.), then
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`(*voice.Session).Disconnect()`
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## Examples
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Check the integration tests at [voice/integration_test.go](https://github.com/diamondburned/arikawa/blob/master/voice/integration_test.go).
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