CallPlayback

Represents a current or past playback in a call.

Obtain instances of this class by starting a Playback with one of the following methods:

• Call.play
• Call.playAudio
• Call.playRingtone
• Call.playSilence
• Call.playTTS

Example

Playing a text-to-speech message and waiting for it to end before proceeding to the next instructions.

import { SignalWire } from "@signalwire/realtime-api";

const client = await SignalWire({ project, token });


const call = await client.voice.dialPhone({
  from: "+YYYYYYYYYY",
  to: "+XXXXXXXXXX",
});

// Start a TTS playback
await call.playTTS({
  text: "Welcome to SignalWire!",
  listen: {
    onStarted: () => console.log("Playback started"),
    onUpdated: (playback) => console.log("Playback updated", playback.state),
    onEnded: async (playback) => {
      console.log("Playback ended", playback.state);
      // Hangup the call
      call.hangup();
    },
    onFailed: () => console.log("Playback failed")
  }
}).onStarted();

Properties

id

The unique ID for this playback.

Syntax: CallPlayback.id()

Returns: string

---

Methods

pause

▸ pause(): Promise<CallPlayback>

Pauses the playback.

Returns

Promise<CallPlayback>

A promise that is resolved only after the playback is paused.

Example

const playback = await call.playAudio({
  url: "https://cdn.signalwire.com/default-music/welcome.mp3",
}).onStarted();
await playback.pause();

---

ended

▸ ended(): Promise<CallPlayback>

Waits for the playback to end.

Returns

Promise<CallPlayback>

A promise that is resolved to CallPlayback when the playback ends.

Example

const playback = await call.playAudio({
  url: "https://cdn.signalwire.com/default-music/welcome.mp3",
}).onStarted();
await playback.ended();

---

resume

▸ resume(): Promise<CallPlayback>

Resumes the playback if it was paused.

Returns

Promise<CallPlayback>

A promise that is resolved to CallPlayback when the playback is resumed.

Example

const playback = await call.playAudio({
  url: "https://cdn.signalwire.com/default-music/welcome.mp3",
}).onStarted();
await playback.resume();

---

setVolume

▸ setVolume(volume): Promise<CallPlayback>

Changes the volume of the playback.

Parameters

Name	Type	Description
volume	number	Volume value between -40dB and +40dB.

Returns

Promise<CallPlayback>

A promise that is resolved to CallPlayback when the volume is changed.

Example

const playback = await call.playAudio({
  url: "https://cdn.signalwire.com/default-music/welcome.mp3",
}).onStarted();
await playback.setVolume(-20);

---

stop

▸ stop(): Promise<CallPlayback>

Stops the playback.

Returns

Promise<CallPlayback>

A promise that is resolved to CallPlayback when the playback is stopped.

Example

const playback = await call.playAudio({
  url: "https://cdn.signalwire.com/default-music/welcome.mp3",
}).onStarted();
await playback.stop();

---

Events

onStarted

▸ CallCollect.listen({ onStarted: Callback }})

Emitted when the playback starts playing. Your event handler will receive an instance of CallPlayback.

Parameters

Name	Type	Description
playback	CallPlayback	The playback instance.

---

onUpdated

▸ CallCollect.listen({ onUpdated: Callback }})

Emitted when the playback is updated. Your event handler will receive an instance of CallPlayback.

Parameters

Name	Type	Description
playback	CallPlayback	The playback instance.

---

onFailed

▸ CallCollect.listen({ onFailed: Callback }})

Emitted when the playback fails to start. Your event handler will receive an instance of CallPlayback.

Parameters

Name	Type	Description
playback	CallPlayback	The playback instance.

---

onEnded

▸ CallCollect.listen({ onEnded: Callback }})

Emitted when the playback finishes playing. Your event handler will receive an instance of CallPlayback.

Parameters

Name	Type	Description
playback	CallPlayback	The playback instance.