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API

This module exports only one function and error objects.

function createRecorder(apiKey, [ options ])

Construct an object of type Recorder.

Parameters

Name Type Required Default Description
apiKey string API key associated with you account.
options options object See options object.

options object

Name Type Required Default Description
auth auth object Information to authenticate recording. If API key authentication is enabled, this parameter is required.
iceServers RTCIceServer[] TURN servers that can be used by the ICE Agent. SkyWay ice servers are used by default.
iceTransportPolicy RTCIceTransportPolicy[] all all and relay are supported. relay indicates ICE engine only use relay candidates.

auth object

It is calculated using the HMAC-SHA256 algorithm on the string timestamp, with the secret key for the app. The final value should be in base64 string format.

Name Type Required Default Description
credential string The HMAC credential for API key authentication.
timestamp string The UNIX timestamp which used to calculate credential.
timestamp must be a 10 digits.

Sample code to generate credential using Node.js looks like this.

const credential = require("crypto")
  .createHmac("sha256", YOUR_SECRET_KEY)
  .update(timestamp)
  .digest("base64");

Return value

An instance of type Recorder.

Exceptions

TypeError is thrown, if invalid parameters are given.

errors

This object contains below members.


class Recorder extends EventEmitter

The Recorder class is used for recording a audio track via SkyWay recording server.

An instance of type Recorder should be constructed via createRecorder(apiKey, [options])

recorder.state readonly

An instance of type RecorderState

RecorderState

RecorderState represents the current state of an instance of Recorder.

Transitions are:

  • createRecorder(apiKey, [options]): new [initial state]
  • start(track): recording
  • stop(): closed

RecorderState transitions diagram is shown below.

-- new Recorder(apiKey, [options]) --> "new" -- start(track) --> "recording" -- stop() --> "closed"

⚠️ You can not reuse a recorder for recording tracks.

async recorder.start(track)

recorder.start(track) starts recording a given audio track. If the recording is successfully started, recorder.state changes to recording.

Parameters

Name Type Required Default Description
track MediaStreamTrack A MediaStreamTrack to record

Return value

The recording ID which is used as the uploading file path of the audio recording file.

Exceptions

  • TypeError is thrown if invalid type for parameters are given as follows:
    • track is not passed or falsy
    • track.kind is not equal to audio. Note that video is not supported.
  • InvalidStateError is thrown if recorder.state isn't new.
  • RequestError is thrown if invalid request parameter was given as follows:
    • The application associated with the given apiKey does not found.
    • The given credential does not match to computed credentials by SkyWay server.
    • etc.
  • NetworkError is thrown, if request for SkyWay backend server failed due to network issues.
  • ServerError is thrown, if the SkyWay server encountered an internal error.

async recorder.stop()

recorder.stop() stops recording. If the recording is successfully stoped, recorder.state changes to closed.

After the recording is stopped, SkyWay recording server is going to upload the recording audio file into the bucket of Google Cloud Storage specified in SkyWay Dashboard. The uploaded filename is equal to the recording ID.

Return value

undefined

Exceptions

  • InvalidStateError is thrown, if recorder.state is not recording.
  • RequestError is thrown if invalid request parameter was given as follows:
    • The application associated with the given apiKey does not found.
    • The given credential does not match to computed credentials by SkyWay server.
  • NetworkError is thrown, if request for SkyWay backend server failed due to network issues.
  • ServerError is thrown, if the SkyWay server encountered an internal error.

Notes

  • recorder.stop() calls track.stop() internally
    • you may want to call track.clone() before recorder.start(track)
  • if you call recorder.stop() too early after started, it may fail to record

Event: abort

The abort event is emitted when the following errors occured during a recording.

  • Disconnected from server for any reason. The possible causes include:
    • Network issue,
    • Recording exceeding the maximum recordable time of audio track.
  • Transport closed by server error.
  • Recording track ended.

class TypeError

The TypeError class is used for reports errors that arise because a parameter has incorrect type.

class InvalidStateError

The InvalidStateError class is used for reports errors that arise because a method is called with an invalid state.

class AbortError

The AbortError class is used for reports errors that arise because a request is aborted. For example, the AbortError is thrown if an externally stopping the audio track being transmitted caused by the disconnection of microphones associated with the recording.

class RequestError

The RequestError class is used for reports errors that arise because invalid request parameters are given.

class NetworkError

The NetworkError class is used for reports errors that arise because a request failed due to network issues.

class ServerError

The ServerError class is used for reports errors that arise because a requested SkyWay server encountered an internal error.

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