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More information: https://www.jsdelivr.com/using-sri-with-dynamic-files\n */\n","/*\n [wx-voice]\n Convert audio files between Tencent apps (Weixin / Wechat, QQ) and Silk codec with other general format such as MP3 and M4A\n \n Github: https://github.com/Ang-YC/wx-voice\n Author: AngYC \n*/\n\n'use strict';\n\nconst EventEmitter = require('events');\nconst { spawn } = require('child_process');\nconst Ffmpeg = require('fluent-ffmpeg');\n\nconst os = require('os');\nconst fs = require('fs');\nconst path = require('path');\nconst which = require('which');\nconst dataUri = require('strong-data-uri');\nconst readChunk = require('read-chunk');\nconst randomatic = require('randomatic');\n\n\n\nclass WxVoice extends EventEmitter {\n\n constructor(tempDir = os.tmpdir(), ffmpegPath) {\n super();\n\n this._tempDir = path.resolve(tempDir);\n this._ffmpegPath = ffmpegPath;\n\n // Check if dependencies are available\n this._checkDependencies();\n }\n\n\n decode(input, output, options, callback) {\n var ext, buffer,\n fileFormat;\n\n // Make it into absolute path\n input = path.resolve(input);\n output = path.resolve(output);\n\n // Set options default to {}\n if (options === undefined) {\n options = {};\n }\n\n // Set format as extension if undefined\n if (options.format === undefined) {\n ext = path.extname(output);\n\n if (ext[0] == \".\")\n ext = ext.substr(1);\n\n options.format = ext;\n }\n\n // Callback after decode is done\n callback = validateFunction(callback);\n\n // Check if file exists and get file format\n try {\n buffer = readChunk.sync(input, 0, 4100);\n fileFormat = fileType(buffer);\n } catch (e) {\n this.emit(\"error\", e);\n return callback();\n }\n\n\n // Check if file is silk, webm or others\n if (fileFormat && fileFormat.mime == \"audio/silk\") {\n\n // Default frequency\n var outputPCM = (options.format == \"pcm\"),\n silkFrequency = (outputPCM && options.frequency) ? 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0 : duration;\n }\n\n callback(duration);\n });\n }\n\n\n _convert(rawInput, rawOutput, input, output, options, callback) {\n\n var started = false,\n format = options.format,\n bitrate = options.bitrate,\n frequency = options.frequency,\n channels = options.channels,\n ffmpeg = Ffmpeg(input)\n .on(\"start\", onStart)\n .on(\"error\", onError)\n .on(\"end\", onEnd);\n\n // Additional parameters for raw\n if (rawInput) {\n ffmpeg = ffmpeg.inputFormat(\"s16le\").inputOptions([\"-ar 24000\", \"-ac 1\"]);\n } else if (rawOutput) {\n if (format == \"silk\" || format == \"silk_amr\") {\n format = \"s16le\";\n ffmpeg = ffmpeg.outputOptions([\"-ar 24000\", \"-ac 1\"]);\n } else if (format == \"webm\") {\n ffmpeg = ffmpeg.outputOptions([\"-ar 48000\", \"-ac 1\"]).audioCodec(\"opus\");\n }\n }\n\n // Other settings\n if (bitrate) { ffmpeg = ffmpeg.audioBitrate(bitrate); }\n if (frequency) { ffmpeg = ffmpeg.audioFrequency(frequency); }\n if (channels) { ffmpeg = ffmpeg.audioChannels(channels); }\n\n // Format dependent\n if (format == \"m4a\") {\n ffmpeg = ffmpeg.audioCodec(\"aac\");\n } else if (format == \"pcm\") {\n ffmpeg = ffmpeg.format(\"s16le\");\n } else {\n ffmpeg = ffmpeg.format(format);\n }\n\n // Output\n ffmpeg.noVideo().save(output);\n\n function onStart(commandLine) {\n started = true;\n }\n\n function onError(err, stdout, stderr) {\n started = false;\n callback();\n }\n\n function onEnd(stdout, stderr) {\n if (started) {\n started = false;\n callback(output);\n }\n }\n }\n\n\n _decodeSilk(input, frequency, callback) {\n var output = this._getTempFile(input + \".pcm\"),\n decoder = spawn(this._getSilkSDK(\"decoder\"), [input, output, \"-Fs_API\", frequency]);\n\n // Allow it to output\n decoder.stdout.on('data', (data) => { });\n decoder.stderr.on('data', (data) => { });\n\n decoder.on('close', (code) => {\n if (code == 1) { // Error occured\n callback();\n } else { // Success\n callback(output);\n }\n });\n }\n\n\n _encodeSilk(input, output, type, callback) {\n var flag = (type == \"silk_amr\" ? \"-tencent_amr\" : \"-tencent\"),\n encoder = spawn(this._getSilkSDK(\"encoder\"), [input, output, flag]);\n\n // Allow it to output\n encoder.stdout.on('data', (data) => { });\n encoder.stderr.on('data', (data) => { });\n\n encoder.on('close', (code) => {\n if (code == 1) { // Error occured\n callback();\n } else { // Success\n callback(output);\n }\n });\n }\n\n\n _tryWebM(input, callback) {\n var output = this._getTempFile(input + \".webm\"),\n base64 = \"\";\n\n fs.readFile(input, (err, data) => {\n if (err) return callback();\n\n // Convert to string and check if Data URI is WebM\n base64 = data.toString();\n if (base64.startsWith(\"data:audio/webm;base64,\")) {\n this._parseWebM(base64, output, callback);\n } else {\n callback();\n }\n });\n }\n\n\n _parseWebM(base64, output, callback) {\n var buffer;\n\n // Convert to buffer\n try {\n buffer = dataUri.decode(base64);\n } catch (e) {\n return callback();\n }\n\n // Write to file\n fs.writeFile(output, buffer, (err) => {\n if (err) return callback();\n callback(output);\n });\n }\n\n\n _encodeWebM(input, output, callback) {\n var uri = \"\";\n\n fs.readFile(input, (err, data) => {\n if (err) return callback();\n uri = dataUri.encode(data, \"audio/webm\");\n\n // Write to file\n fs.writeFile(output, uri, (err) => {\n if (err) return callback();\n callback(output);\n }); \n });\n }\n\n\n _checkDependencies() {\n var silkDecoder = this._getSilkSDK(\"decoder\"),\n silkEncoder = this._getSilkSDK(\"encoder\"),\n ffmpegPath = this._ffmpegPath;\n\n // Check if Silk SDK is available\n if (!fs.existsSync(silkDecoder) || !fs.existsSync(silkEncoder)) {\n throw new Error(\"Silk SDK not found, make sure you compiled using command: wx-voice compile\");\n }\n\n if (ffmpegPath && fs.existsSync(ffmpegPath)) {\n this._ffmpegPath = path.resolve(ffmpegPath);\n Ffmpeg.setFfmpegPath(this._ffmpegPath);\n\n } else if (ffmpegPath = this._getFfmpegPath()) {\n this._ffmpegPath = path.resolve(ffmpegPath);\n\n } else {\n throw new Error(\"FFMPEG not found\");\n }\n }\n\n\n _getSilkSDK(type) {\n return path.resolve(__dirname, \"silk\", type);\n }\n\n\n _getFfmpegPath() {\n // Get FFMPEG Path (Sync version of _getFfmpegPath in fluent-ffmpeg)\n var path;\n\n // Search in FFMPEG_PATH\n if (process.env.FFMPEG_PATH && fs.existsSync(process.env.FFMPEG_PATH)) {\n path = process.env.FFMPEG_PATH;\n // Search in PATH, return null if not found\n } else {\n path = which.sync(\"ffmpeg\", { nothrow: true });\n }\n\n // Return undefined\n if (path === null || path === \"\") path = undefined;\n return path;\n }\n\n\n _getTempFile(fileName, noPrefix) {\n var file = path.basename(fileName);\n\n if (!noPrefix)\n file = randomatic(\"a0\", 16) + \"_\" + file;\n\n return path.resolve(this._tempDir, file);\n }\n\n\n _deleteTempFile(fileName) {\n if (fileName) {\n fileName = this._getTempFile(fileName, true);\n fs.unlink(fileName, () => {});\n }\n }\n}\n\n\n\n// Utililities\n\nfunction fileType(input) {\n const buf = new Uint8Array(input);\n\n if (!(buf && buf.length > 1)) {\n return null;\n }\n\n const check = (header) => {\n for (let i = 0; i < header.length; i++) {\n if (header[i] !== buf[i]) {\n return false;\n }\n }\n\n return true;\n };\n\n if (check([0x23, 0x21, 0x53, 0x49, 0x4C, 0x4B, 0x0A]) || // Skype V1: #!SILK\\n (https://tools.ietf.org/html/draft-spittka-silk-payload-format-00)\n check([0x23, 0x21, 0x53, 0x49, 0x4C, 0x4B, 0x5F, 0x56, 0x33]) || // Skype V3: #!SILK_V3\n check([0x02, 0x23, 0x21, 0x53, 0x49, 0x4C, 0x4B, 0x5F, 0x56, 0x33]) || // Tencent variation: .#!SILK_V3\n check([0x23, 0x21, 0x41, 0x4D, 0x52, 0x0A, 0x02, 0x23, 0x21, 0x53, 0x49, 0x4C, 0x4B, 0x5F, 0x56, 0x33])) { // Tencent AMR variation: #!AMR\\n.#!SILK_V3\n\n return {\n ext: 'sil',\n mime: 'audio/silk'\n };\n }\n\n return null;\n}\n\nfunction isFunction(f) {\n return (f && typeof f === 'function');\n}\n\nfunction validateFunction(f) {\n return (isFunction(f) ? 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