{"version":3,"file":"audioProcessing.21cb49e1.mjs","sources":["../../src/components/ReactFileUtilities/utils.ts","../../src/components/MediaRecorder/transcode/audioProcessing.ts"],"sourcesContent":["import type { FileLike, RecordedMediaType } from './types';\nimport type { ChangeEvent } from 'react';\nimport { useCallback } from 'react';\n\nexport const useHandleFileChangeWrapper = (\n resetOnChange = false,\n handler?: (files: Array) => void,\n) =>\n useCallback(\n ({ currentTarget }: ChangeEvent) => {\n const { files } = currentTarget;\n\n if (!files) return;\n\n try {\n handler?.(Array.from(files));\n } catch (error) {\n console.error(error);\n }\n\n if (resetOnChange) currentTarget.value = '';\n },\n [handler, resetOnChange],\n );\n\nexport function dataTransferItemsHaveFiles(items?: DataTransferItem[]): boolean {\n if (!items || !items.length) {\n return false;\n }\n for (const item of items) {\n if (item.kind === 'file' || item.type === 'text/html') {\n return true;\n }\n }\n return false;\n}\n\nexport async function dataTransferItemsToFiles(\n items?: DataTransferItem[],\n): Promise {\n if (!items || !items.length) {\n return [];\n }\n\n // If there are files inside the DataTransferItem prefer those\n const fileLikes = getFileLikes(items);\n if (fileLikes.length) {\n return fileLikes;\n }\n\n // Otherwise extract images from html\n const blobPromises = [];\n for (const item of items) {\n if (item.type === 'text/html') {\n blobPromises.push(\n new Promise((accept) => {\n item.getAsString(async (s) => {\n const imagePromises = extractImageSources(s).map((src) =>\n getImageSource(fileLikes, src),\n );\n\n await Promise.all(imagePromises);\n accept();\n });\n }),\n );\n }\n }\n await Promise.all(blobPromises);\n return fileLikes;\n}\n\nfunction getFileLikes(items: DataTransferItem[]) {\n const fileLikes = [];\n for (const item of items) {\n if (item.kind === 'file') {\n const file = item.getAsFile();\n if (file) {\n fileLikes.push(file);\n }\n }\n }\n return fileLikes;\n}\n\nasync function getImageSource(fileLikes: FileLike[], src: string) {\n let res;\n try {\n res = await fetch(src);\n } catch (e) {\n return;\n }\n const contentType = res.headers.get('Content-type') || 'application/octet-stream';\n const buf = await res.arrayBuffer();\n const blob = new Blob([buf], { type: contentType });\n fileLikes.push(blob);\n}\n\nconst extractImageSources = (s: string) => {\n const imageTags = new DOMParser()\n .parseFromString(s, 'text/html')\n .getElementsByTagName('img');\n return Array.from(imageTags, (tag) => tag.src).filter((tag) => tag);\n};\n\nexport const isBlobButNotFile = (obj: unknown): obj is Blob =>\n obj instanceof Blob && !(obj instanceof File);\n\nexport const createFileFromBlobs = ({\n blobsArray,\n fileName,\n mimeType,\n}: {\n blobsArray: Blob[];\n fileName: string;\n mimeType: string;\n}) => {\n const concatenatedBlob = new Blob(blobsArray, { type: mimeType });\n return new File([concatenatedBlob], fileName, { type: concatenatedBlob.type });\n};\n\nexport const getExtensionFromMimeType = (mimeType: string) => {\n const match = mimeType.match(/\\/([^/;]+)/);\n return match && match[1];\n};\n\nexport const getRecordedMediaTypeFromMimeType = (\n mimeType: string,\n): RecordedMediaType | null => {\n const match = mimeType.match(/^(audio|video)\\/.*$/);\n return match && (match[1] as RecordedMediaType);\n};\n\nexport const readFileAsArrayBuffer = (file: File): Promise =>\n new Promise((resolve, reject) => {\n const fileReader = new FileReader();\n fileReader.onload = () => {\n resolve(fileReader.result as ArrayBuffer);\n };\n\n fileReader.onerror = () => {\n reject(fileReader.error);\n };\n\n fileReader.readAsArrayBuffer(file);\n });\n\nexport const generateFileName = (mimeType: string) =>\n `file_${new Date().toISOString()}.${getExtensionFromMimeType(mimeType)}`;\n","import { readFileAsArrayBuffer } from '../../ReactFileUtilities';\n\n/**\n * In the context of resampling audio data, AudioContext is used to decode the input audio file into an AudioBuffer,\n * which is a fundamental data structure representing audio data.\n * @param file\n */\nexport const toAudioBuffer = async (file: File) => {\n const audioCtx = new AudioContext();\n\n const arrayBuffer = await readFileAsArrayBuffer(file);\n const decodedData = await audioCtx.decodeAudioData(arrayBuffer);\n if (audioCtx.state !== 'closed') await audioCtx.close();\n return decodedData;\n};\n\n/**\n * OfflineAudioContext is a specialized type of AudioContext that does not render audio in real-time and is used for offline audio processing tasks.\n * It allows performing audio processing and rendering without actually playing the audio through speakers or outputting it to a destination.\n * In the context of resampling audio data, OfflineAudioContext is used to resample the decoded AudioBuffer from a file to the desired sample rate.\n * It provides more flexibility and control over audio processing, as it can operate at different sample rates and durations compared to real-time audio contexts.\n * @param audioBuffer\n * @param sampleRate\n */\nexport const renderAudio = async (audioBuffer: AudioBuffer, sampleRate: number) => {\n const offlineAudioCtx = new OfflineAudioContext(\n audioBuffer.numberOfChannels,\n audioBuffer.duration * sampleRate,\n sampleRate,\n );\n const source = offlineAudioCtx.createBufferSource();\n source.buffer = audioBuffer;\n source.connect(offlineAudioCtx.destination);\n source.start();\n\n return await 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