How do I use RTC SDK for web to ingest streams when no microphones are available?-Real-Time Communication(RTC)-阿里云帮助中心

This topic describes how to use Real-Time Communication (RTC) SDK for web to ingest streams when no microphones are available.

Enable the subscription-only mode for your browser. This way, you can skip the browser check.

aliWebrtc.isSupport({isReceiveOnly: true}).then((re)=>{
    // The subscription-only mode is supported.
}).catch(err => {
    // The subscription-only mode is not supported.
})

Query the audio track that you want to replace and call the setExternalMediaTrack method to replace the audio track with an external audio source.

// Query the media track.
let mediaStream = video.captureStream(); // video indicates the type of the media track that you want to query.
// Query audio tracks.
let audiotracks = mediaStream && mediaStream.getAudioTracks()
// Select the audio track that you want to replace.
let audiotrack = (audiotracks && audiotracks.length) ? audiotracks[0]
// Replace the audio track with an external audio source.
aliWebrtc.setExternalMediaTrack(audiotrack, 0);

Note

Before the replacement, make sure that you stop ingesting streams.
Every time you stop ingesting streams, you must configure an external audio source again.

Ingest streams. You do not need to ingest a stream for the audio track. RTC SDK for web identifies that a stream is ingested for the external audio source, so the browser check is skipped.