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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1 +1 @@ | ||
| 0.8.9 | ||
| 0.8.10 |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1 +1 @@ | ||
| 0.8.9 | ||
| 0.8.10 |
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| # Web UI Streaming Client | ||
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| ## Introduction | ||
| LCA UI offers an option to stream audio from a browser tab+Microphone to LCA/Agent Assist. | ||
| Enable the feature `WebSocketAudioInput` when deploying/updating the LCA stack. | ||
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| To use this feature: | ||
| 1. From the LCA UI, click on `Stream Audio` link from the left navigation menu as shown below.  | ||
| 2. Change default values for Call ID, Agent ID, Customer Phone, and System Phone as needed. Assign a role to the mic input - Agent vs. Caller. | ||
| 3. Click on `Start Streaming` as shown below. | ||
| 4. Share the browser tab that is playing the media (video/audio files, meeting, etc.) | ||
| 5. Speak into the microphone. | ||
| 6. The web streaming client combines the audio output from browser tab and the microphone input into a streo (two channel) audio stream. The client sends the stream to the websocket server for downstream processing (enrichment, agent assist, etc.). | ||
| 7. Click on `Stop Streaming` to end the streaming session.  | ||
|
|
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113 changes: 113 additions & 0 deletions
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lca-ai-stack/source/ui/public/worklets/recording-processor.js
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| // Based on sample from | ||
| // https://github.com/GoogleChromeLabs/web-audio-samples/blob/main/src/audio-worklet/migration/worklet-recorder/recording-processor.js | ||
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| class RecordingProcessor extends AudioWorkletProcessor { | ||
| constructor(options) { | ||
| super(); | ||
| this.sampleRate = 0; | ||
| this.maxRecordingFrames = 0; | ||
| this.numberOfChannels = 0; | ||
| this._frameSize = 128; | ||
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| if (options && options.processorOptions) { | ||
| const { | ||
| numberOfChannels, | ||
| sampleRate, | ||
| maxFrameCount, | ||
| } = options.processorOptions; | ||
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| this.sampleRate = sampleRate; | ||
| this.maxRecordingFrames = maxFrameCount; | ||
| this.numberOfChannels = numberOfChannels; | ||
| } | ||
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| this._leftRecordingBuffer = new Float32Array(this.maxRecordingFrames); | ||
| this._rightRecordingBuffer = new Float32Array(this.maxRecordingFrames); | ||
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| this.recordedFrames = 0; | ||
| this.isRecording = false; | ||
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| this.framesSinceLastPublish = 0; | ||
| this.publishInterval = this.sampleRate * 5; | ||
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| this.port.onmessage = (event) => { | ||
| if (event.data.message === 'UPDATE_RECORDING_STATE') { | ||
| this.isRecording = event.data.setRecording; | ||
| } | ||
| }; | ||
| } | ||
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| process(inputs, outputs) { | ||
| let currentSample = 0.0; | ||
| for (let input = 0; input < 1; input++) { | ||
| for (let channel = 0; channel < this.numberOfChannels; channel++) { | ||
| for (let sample = 0; sample < inputs[input][channel].length; sample++) { | ||
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| currentSample = inputs[input][channel][sample]; | ||
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| if (this.isRecording) { | ||
| if (channel == 0) { | ||
| this._leftRecordingBuffer[sample+this.recordedFrames] = currentSample; | ||
| } else if (channel == 1) { | ||
| this._rightRecordingBuffer[sample+this.recordedFrames] = currentSample; | ||
| } | ||
| } | ||
| // Pass data directly to output, unchanged. | ||
| outputs[input][channel][sample] = currentSample; | ||
| } | ||
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| } | ||
| } | ||
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| const shouldPublish = this.framesSinceLastPublish >= this.publishInterval; | ||
|
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| // Validate that recording hasn't reached its limit. | ||
| if (this.isRecording) { | ||
| if (this.recordedFrames + this._frameSize < this.maxRecordingFrames) { | ||
| this.recordedFrames += this._frameSize; | ||
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| // Post a recording recording length update on the clock's schedule | ||
| if (shouldPublish) { | ||
| const recordingBuffer = new Array(this.numberOfChannels) | ||
| .fill(new Float32Array(this.maxRecordingFrames)); | ||
| recordingBuffer[0] = this._leftRecordingBuffer; | ||
| recordingBuffer[1] = this._rightRecordingBuffer; | ||
| this.port.postMessage({ | ||
| message: 'SHARE_RECORDING_BUFFER', | ||
| buffer: recordingBuffer, | ||
| recordingLength: this.recordedFrames | ||
| }); | ||
| this.framesSinceLastPublish = 0; | ||
| this.recordedFrames = 0 | ||
| } else { | ||
| this.framesSinceLastPublish += this._frameSize; | ||
| } | ||
| } else { | ||
| this.recordedFrames += this._frameSize; | ||
|
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| const recordingBuffer = new Array(this.numberOfChannels) | ||
| .fill(new Float32Array(this.maxRecordingFrames)); | ||
| recordingBuffer[0] = this._leftRecordingBuffer; | ||
| recordingBuffer[1] = this._rightRecordingBuffer; | ||
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| this.port.postMessage({ | ||
| message: 'SHARE_RECORDING_BUFFER', | ||
| buffer: recordingBuffer, | ||
| recordingLength: this.recordedFrames | ||
| }); | ||
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| this.recordedFrames = 0; | ||
| this.framesSinceLastPublish = 0; | ||
| } | ||
| } else { | ||
| console.log('stopping worklet processor node') | ||
| this.recordedFrames = 0; | ||
| this.framesSinceLastPublish = 0; | ||
| return false; | ||
| } | ||
|
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| return true; | ||
| } | ||
| } | ||
|
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| registerProcessor('recording-processor', RecordingProcessor); |
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