Set bitrate for voice channels support (#363)

* Set bitrate for voice channels

* Docs for bitrate settings and values

src/Client/Client.js

@@ -989,6 +989,12 @@ export default class Client extends EventEmitter {
 			.then(dataCallback(callback), errorCallback(callback));
 	}
 
+	// def setChannelBitrate
+	setChannelBitrate(channel, kbitrate, callback = (/*err, {}*/) => { }) {
+		return this.internal.setChannelBitrate(channel, kbitrate)
+			.then(dataCallback(callback), errorCallback(callback));
+	}
+
 	// def updateChannel
 	updateChannel(channel, data, callback = (/*err, {}*/) => { }) {
 		return this.internal.updateChannel(channel, data)

src/Client/InternalClient.js

@@ -1374,6 +1374,27 @@ export default class InternalClient {
 		});
 	}
 
+	//def setChannelBitrate
+	setChannelBitrate(channel, kbitrate) {
+		kbitrate = kbitrate || 64; // default 64kbps
+
+		if (kbitrate < 8 || kbitrate > 96)
+			return Promise.reject(new Error("Bitrate must be between 8-96kbps"));
+
+		return this.resolver.resolveChannel(channel).then(channel => {
+			if (channel.type !== "voice")
+				return Promise.reject(new Error("Channel must be a voice channel"));
+
+			return this.apiRequest("patch", Endpoints.CHANNEL(channel.id), true, {
+				name: channel.name,
+				user_limit: channel.userLimit,
+				position: channel.position,
+				bitrate: kbitrate * 1000 // in bps
+			})
+			.then(() => channel.bitrate = kbitrate);
+		});
+	}
+
 	//def updateChannel
 	updateChannel(chann, data) {
 		return this.setChannelNameAndTopic(chann, data.name, data.topic);

src/Structures/VoiceChannel.js

@@ -9,6 +9,8 @@ export default class VoiceChannel extends ServerChannel{
 		super(data, client, server);
 		this.members = data.members || new Cache();
 		this.userLimit = data.user_limit || 0;
+		this._bitrate = data.bitrate || 64000; // incase somebody wants to access the bps value???
+		this.bitrate = Math.round(this._bitrate / 1000); // store as kbps
 	}
 
 	join(callback = function () { }) {
@@ -18,4 +20,8 @@ export default class VoiceChannel extends ServerChannel{
 	setUserLimit() {
 		return this.client.setChannelUserLimit.apply(this.client, [this, arguments]);
 	}
+
+	setBitrate() {
+		return this.client.setChannelBitrate.apply(this.client, reg(this, arguments));
+	}
 }