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- {"ast":null,"code":"\"use strict\";\n\n// Copyright (c) Microsoft Corporation. All rights reserved.\n// Licensed under the MIT license.\nObject.defineProperty(exports, \"__esModule\", {\n value: true\n});\nexports.PcmRecorder = void 0;\nconst Exports_1 = require(\"../common/Exports\");\nclass PcmRecorder {\n constructor(stopInputOnRelease) {\n this.privStopInputOnRelease = stopInputOnRelease;\n }\n record(context, mediaStream, outputStream) {\n const desiredSampleRate = 16000;\n const waveStreamEncoder = new Exports_1.RiffPcmEncoder(context.sampleRate, desiredSampleRate);\n const micInput = context.createMediaStreamSource(mediaStream);\n const attachScriptProcessor = () => {\n // eslint-disable-next-line @typescript-eslint/explicit-function-return-type\n const scriptNode = (() => {\n let bufferSize = 0;\n try {\n return context.createScriptProcessor(bufferSize, 1, 1);\n } catch (error) {\n // Webkit (<= version 31) requires a valid bufferSize.\n bufferSize = 2048;\n let audioSampleRate = context.sampleRate;\n while (bufferSize < 16384 && audioSampleRate >= 2 * desiredSampleRate) {\n bufferSize <<= 1;\n audioSampleRate >>= 1;\n }\n return context.createScriptProcessor(bufferSize, 1, 1);\n }\n })();\n scriptNode.onaudioprocess = event => {\n const inputFrame = event.inputBuffer.getChannelData(0);\n if (outputStream && !outputStream.isClosed) {\n const waveFrame = waveStreamEncoder.encode(inputFrame);\n if (!!waveFrame) {\n outputStream.writeStreamChunk({\n buffer: waveFrame,\n isEnd: false,\n timeReceived: Date.now()\n });\n }\n }\n };\n micInput.connect(scriptNode);\n scriptNode.connect(context.destination);\n this.privMediaResources = {\n scriptProcessorNode: scriptNode,\n source: micInput,\n stream: mediaStream\n };\n };\n // https://webaudio.github.io/web-audio-api/#audioworklet\n // Using AudioWorklet to improve audio quality and avoid audio glitches due to blocking the UI thread\n const skipAudioWorklet = !!this.privSpeechProcessorScript && this.privSpeechProcessorScript.toLowerCase() === \"ignore\";\n if (!!context.audioWorklet && !skipAudioWorklet) {\n if (!this.privSpeechProcessorScript) {\n const workletScript = `class SP extends AudioWorkletProcessor {\n constructor(options) {\n super(options);\n }\n process(inputs, outputs) {\n const input = inputs[0];\n const output = [];\n for (let channel = 0; channel < input.length; channel += 1) {\n output[channel] = input[channel];\n }\n this.port.postMessage(output[0]);\n return true;\n }\n }\n registerProcessor('speech-processor', SP);`;\n const blob = new Blob([workletScript], {\n type: \"application/javascript; charset=utf-8\"\n });\n this.privSpeechProcessorScript = URL.createObjectURL(blob);\n }\n context.audioWorklet.addModule(this.privSpeechProcessorScript).then(() => {\n const workletNode = new AudioWorkletNode(context, \"speech-processor\");\n workletNode.port.onmessage = ev => {\n const inputFrame = ev.data;\n if (outputStream && !outputStream.isClosed) {\n const waveFrame = waveStreamEncoder.encode(inputFrame);\n if (!!waveFrame) {\n outputStream.writeStreamChunk({\n buffer: waveFrame,\n isEnd: false,\n timeReceived: Date.now()\n });\n }\n }\n };\n micInput.connect(workletNode);\n workletNode.connect(context.destination);\n this.privMediaResources = {\n scriptProcessorNode: workletNode,\n source: micInput,\n stream: mediaStream\n };\n }).catch(() => {\n attachScriptProcessor();\n });\n } else {\n try {\n attachScriptProcessor();\n } catch (err) {\n throw new Error(`Unable to start audio worklet node for PCMRecorder: ${err}`);\n }\n }\n }\n releaseMediaResources(context) {\n if (this.privMediaResources) {\n if (this.privMediaResources.scriptProcessorNode) {\n this.privMediaResources.scriptProcessorNode.disconnect(context.destination);\n this.privMediaResources.scriptProcessorNode = null;\n }\n if (this.privMediaResources.source) {\n this.privMediaResources.source.disconnect();\n if (this.privStopInputOnRelease) {\n this.privMediaResources.stream.getTracks().forEach(track => track.stop());\n }\n this.privMediaResources.source = null;\n }\n }\n }\n setWorkletUrl(url) {\n this.privSpeechProcessorScript = url;\n }\n}\nexports.PcmRecorder = PcmRecorder;","map":{"version":3,"names":["Object","defineProperty","exports","value","PcmRecorder","Exports_1","require","constructor","stopInputOnRelease","privStopInputOnRelease","record","context","mediaStream","outputStream","desiredSampleRate","waveStreamEncoder","RiffPcmEncoder","sampleRate","micInput","createMediaStreamSource","attachScriptProcessor","scriptNode","bufferSize","createScriptProcessor","error","audioSampleRate","onaudioprocess","event","inputFrame","inputBuffer","getChannelData","isClosed","waveFrame","encode","writeStreamChunk","buffer","isEnd","timeReceived","Date","now","connect","destination","privMediaResources","scriptProcessorNode","source","stream","skipAudioWorklet","privSpeechProcessorScript","toLowerCase","audioWorklet","workletScript","blob","Blob","type","URL","createObjectURL","addModule","then","workletNode","AudioWorkletNode","port","onmessage","ev","data","catch","err","Error","releaseMediaResources","disconnect","getTracks","forEach","track","stop","setWorkletUrl","url"],"sources":["F:/workspace/202226701027/huinongbao-app/node_modules/microsoft-cognitiveservices-speech-sdk/distrib/lib/src/common.browser/PCMRecorder.js"],"sourcesContent":["\"use strict\";\n// Copyright (c) Microsoft Corporation. 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