{"version":3,"file":"lib.cjs","sources":["../src/utils/audio.ts","../src/utils/rawAudioProcessor.ts","../src/utils/input.ts","../src/utils/audioConcatProcessor.ts","../src/utils/output.ts","../src/utils/events.ts","../src/utils/connection.ts","../src/index.ts"],"sourcesContent":["export function arrayBufferToBase64(b: ArrayBufferLike) {\n const buffer = new Uint8Array(b);\n // @ts-ignore\n const base64Data = window.btoa(String.fromCharCode(...buffer));\n return base64Data;\n}\n\nexport function base64ToArrayBuffer(base64: string): ArrayBuffer {\n const binaryString = window.atob(base64);\n const len = binaryString.length;\n const bytes = new Uint8Array(len);\n for (let i = 0; i < len; i++) {\n bytes[i] = binaryString.charCodeAt(i);\n }\n return bytes.buffer;\n}\n","/*\n * ulaw encoding logic taken from the wavefile library\n * https://github.com/rochars/wavefile/blob/master/lib/codecs/mulaw.js\n */\n\nconst blob = new Blob(\n [\n // language=JavaScript\n `\n const BIAS = 0x84;\n const CLIP = 32635;\n const encodeTable = [\n 0,0,1,1,2,2,2,2,3,3,3,3,3,3,3,3,\n 4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,\n 5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,\n 5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,\n 6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,\n 6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,\n 6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,\n 6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,\n 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,\n 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,\n 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,\n 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,\n 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,\n 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,\n 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,\n 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7\n ];\n \n function encodeSample(sample) {\n let sign;\n let exponent;\n let mantissa;\n let muLawSample;\n sign = (sample >> 8) & 0x80;\n if (sign !== 0) sample = -sample;\n sample = sample + BIAS;\n if (sample > CLIP) sample = CLIP;\n exponent = encodeTable[(sample>>7) & 0xFF];\n mantissa = (sample >> (exponent+3)) & 0x0F;\n muLawSample = ~(sign | (exponent << 4) | mantissa);\n \n return muLawSample;\n }\n \n class RawAudioProcessor extends AudioWorkletProcessor {\n constructor() {\n super();\n \n this.port.onmessage = ({ data }) => {\n this.buffer = []; // Initialize an empty buffer\n this.bufferSize = data.sampleRate / 4;\n \n if (globalThis.LibSampleRate && sampleRate !== data.sampleRate) {\n globalThis.LibSampleRate.create(1, sampleRate, data.sampleRate).then(resampler => {\n this.resampler = resampler;\n });\n } \n };\n }\n process(inputs) {\n if (!this.buffer) {\n return true;\n }\n \n const input = inputs[0]; // Get the first input node\n if (input.length > 0) {\n let channelData = input[0]; // Get the first channel's data\n\n // Resample the audio if necessary\n if (this.resampler) {\n channelData = this.resampler.full(channelData);\n }\n\n // Add channel data to the buffer\n this.buffer.push(...channelData);\n // Get max volume \n let sum = 0.0;\n for (let i = 0; i < channelData.length; i++) {\n sum += channelData[i] * channelData[i];\n }\n const maxVolume = Math.sqrt(sum / channelData.length);\n // Check if buffer size has reached or exceeded the threshold\n if (this.buffer.length >= this.bufferSize) {\n const float32Array = new Float32Array(this.buffer)\n let encodedArray = this.format === \"ulaw\"\n ? new Uint8Array(float32Array.length)\n : new Int16Array(float32Array.length);\n\n // Iterate through the Float32Array and convert each sample to PCM16\n for (let i = 0; i < float32Array.length; i++) {\n // Clamp the value to the range [-1, 1]\n let sample = Math.max(-1, Math.min(1, float32Array[i]));\n\n // Scale the sample to the range [-32768, 32767]\n let value = sample < 0 ? sample * 32768 : sample * 32767;\n if (this.format === \"ulaw\") {\n value = encodeSample(Math.round(value));\n }\n\n encodedArray[i] = value;\n }\n\n // Send the buffered data to the main script\n this.port.postMessage([encodedArray, maxVolume]);\n\n // Clear the buffer after sending\n this.buffer = [];\n }\n }\n return true; // Continue processing\n }\n }\n registerProcessor(\"raw-audio-processor\", RawAudioProcessor);\n `,\n ],\n { type: \"application/javascript\" }\n);\n\nexport const rawAudioProcessor = URL.createObjectURL(blob);\n","import { rawAudioProcessor } from \"./rawAudioProcessor\";\nimport { FormatConfig } from \"./connection\";\n\nexport type InputConfig = {\n preferHeadphonesForIosDevices?: boolean;\n};\n\nconst LIBSAMPLERATE_JS =\n \"https://cdn.jsdelivr.net/npm/@alexanderolsen/libsamplerate-js@2.1.2/dist/libsamplerate.worklet.js\";\n\nfunction isIosDevice() {\n return (\n [\n \"iPad Simulator\",\n \"iPhone Simulator\",\n \"iPod Simulator\",\n \"iPad\",\n \"iPhone\",\n \"iPod\",\n ].includes(navigator.platform) ||\n // iPad on iOS 13 detection\n (navigator.userAgent.includes(\"Mac\") && \"ontouchend\" in document)\n );\n}\n\nexport class Input {\n public static async create({\n sampleRate,\n format,\n preferHeadphonesForIosDevices,\n }: FormatConfig & InputConfig): Promise {\n let context: AudioContext | null = null;\n let inputStream: MediaStream | null = null;\n\n try {\n const options: MediaTrackConstraints = {\n sampleRate: { ideal: sampleRate },\n echoCancellation: { ideal: true },\n noiseSuppression: { ideal: true },\n };\n\n // some browsers won't allow calling getSupportedConstraints or enumerateDevices\n // before getting approval for microphone access\n const preliminaryInputStream = await navigator.mediaDevices.getUserMedia({\n audio: true,\n });\n preliminaryInputStream?.getTracks().forEach(track => track.stop());\n\n if (isIosDevice() && preferHeadphonesForIosDevices) {\n const availableDevices =\n await window.navigator.mediaDevices.enumerateDevices();\n const idealDevice = availableDevices.find(\n d =>\n // cautious to include \"bluetooth\" in the search\n // as might trigger bluetooth speakers\n d.kind === \"audioinput\" &&\n [\"airpod\", \"headphone\", \"earphone\"].find(keyword =>\n d.label.toLowerCase().includes(keyword)\n )\n );\n if (idealDevice) {\n options.deviceId = { ideal: idealDevice.deviceId };\n }\n }\n\n const supportsSampleRateConstraint =\n navigator.mediaDevices.getSupportedConstraints().sampleRate;\n\n context = new window.AudioContext(\n supportsSampleRateConstraint ? { sampleRate } : {}\n );\n const analyser = context.createAnalyser();\n if (!supportsSampleRateConstraint) {\n await context.audioWorklet.addModule(LIBSAMPLERATE_JS);\n }\n await context.audioWorklet.addModule(rawAudioProcessor);\n\n inputStream = await navigator.mediaDevices.getUserMedia({\n audio: options,\n });\n\n const source = context.createMediaStreamSource(inputStream);\n const worklet = new AudioWorkletNode(context, \"raw-audio-processor\");\n worklet.port.postMessage({ type: \"setFormat\", format, sampleRate });\n\n source.connect(analyser);\n analyser.connect(worklet);\n\n return new Input(context, analyser, worklet, inputStream);\n } catch (error) {\n inputStream?.getTracks().forEach(track => track.stop());\n context?.close();\n throw error;\n }\n }\n\n private constructor(\n public readonly context: AudioContext,\n public readonly analyser: AnalyserNode,\n public readonly worklet: AudioWorkletNode,\n public readonly inputStream: MediaStream\n ) {}\n\n public async close() {\n this.inputStream.getTracks().forEach(track => track.stop());\n await this.context.close();\n }\n}\n","/*\n * ulaw decoding logic taken from the wavefile library\n * https://github.com/rochars/wavefile/blob/master/lib/codecs/mulaw.js\n */\n\nconst blob = new Blob(\n [\n // language=JavaScript\n `\n const decodeTable = [0,132,396,924,1980,4092,8316,16764];\n \n export function decodeSample(muLawSample) {\n let sign;\n let exponent;\n let mantissa;\n let sample;\n muLawSample = ~muLawSample;\n sign = (muLawSample & 0x80);\n exponent = (muLawSample >> 4) & 0x07;\n mantissa = muLawSample & 0x0F;\n sample = decodeTable[exponent] + (mantissa << (exponent+3));\n if (sign !== 0) sample = -sample;\n\n return sample;\n }\n \n class AudioConcatProcessor extends AudioWorkletProcessor {\n constructor() {\n super();\n this.buffers = []; // Initialize an empty buffer\n this.cursor = 0;\n this.currentBuffer = null;\n this.wasInterrupted = false;\n this.finished = false;\n \n this.port.onmessage = ({ data }) => {\n switch (data.type) {\n case \"setFormat\":\n this.format = data.format;\n break;\n case \"buffer\":\n this.wasInterrupted = false;\n this.buffers.push(\n this.format === \"ulaw\"\n ? new Uint8Array(data.buffer)\n : new Int16Array(data.buffer)\n );\n break;\n case \"interrupt\":\n this.wasInterrupted = true;\n break;\n case \"clearInterrupted\":\n if (this.wasInterrupted) {\n this.wasInterrupted = false;\n this.buffers = [];\n this.currentBuffer = null;\n }\n }\n };\n }\n process(_, outputs) {\n let finished = false;\n const output = outputs[0][0];\n for (let i = 0; i < output.length; i++) {\n if (!this.currentBuffer) {\n if (this.buffers.length === 0) {\n finished = true;\n break;\n }\n this.currentBuffer = this.buffers.shift();\n this.cursor = 0;\n }\n\n let value = this.currentBuffer[this.cursor];\n if (this.format === \"ulaw\") {\n value = decodeSample(value);\n }\n output[i] = value / 32768;\n this.cursor++;\n\n if (this.cursor >= this.currentBuffer.length) {\n this.currentBuffer = null;\n }\n }\n\n if (this.finished !== finished) {\n this.finished = finished;\n this.port.postMessage({ type: \"process\", finished });\n }\n\n return true; // Continue processing\n }\n }\n\n registerProcessor(\"audio-concat-processor\", AudioConcatProcessor);\n `,\n ],\n { type: \"application/javascript\" }\n);\n\nexport const audioConcatProcessor = URL.createObjectURL(blob);\n","import { audioConcatProcessor } from \"./audioConcatProcessor\";\nimport { FormatConfig } from \"./connection\";\n\nexport class Output {\n public static async create({\n sampleRate,\n format,\n }: FormatConfig): Promise