{"version":3,"file":"eight-bit-audio.215ec2d8.mjs","sources":["../../../../../../src/lib/eight-bit-processor.worklet.js?url","../../../../../../src/lib/eight-bit-audio.js"],"sourcesContent":["export default \"data:application/javascript;base64,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\"","import workletUrl from \"./eight-bit-processor.worklet.js?url\";\n\n/** @typedef {'subtle' | 'retro' | 'gameboy' | 'nes' | 'arcade'} EightBitPreset */\n\n/** @type {Record} */\nexport const PRESETS = {\n subtle: { bitDepth: 12, sampleRate: 22050, mix: 0.5 },\n retro: { bitDepth: 8, sampleRate: 16000, mix: 0.85 },\n gameboy: { bitDepth: 6, sampleRate: 8192, mix: 1 },\n nes: { bitDepth: 4, sampleRate: 11025, mix: 1 },\n arcade: { bitDepth: 3, sampleRate: 8000, mix: 1 },\n};\n\nconst DEFAULT_SETTINGS = {\n bitDepth: 8,\n sampleRate: 16000,\n mix: 0.85,\n volume: 0.15,\n enabled: false,\n};\n\n/**\n * Encode an AudioBuffer to a 16-bit PCM WAV Blob.\n * @param {AudioBuffer} buffer\n * @returns {Blob}\n */\nexport function encodeWav(buffer) {\n const numChannels = buffer.numberOfChannels;\n const sampleRate = buffer.sampleRate;\n const bitsPerSample = 16;\n const bytesPerSample = bitsPerSample / 8;\n const blockAlign = numChannels * bytesPerSample;\n const dataLength = buffer.length * blockAlign;\n const arrayBuffer = new ArrayBuffer(44 + dataLength);\n const view = new DataView(arrayBuffer);\n\n const writeString = (offset, str) => {\n for (let i = 0; i < str.length; i++)\n view.setUint8(offset + i, str.charCodeAt(i));\n };\n\n writeString(0, \"RIFF\");\n view.setUint32(4, 36 + dataLength, true);\n writeString(8, \"WAVE\");\n writeString(12, \"fmt \");\n view.setUint32(16, 16, true);\n view.setUint16(20, 1, true);\n view.setUint16(22, numChannels, true);\n view.setUint32(24, sampleRate, true);\n view.setUint32(28, sampleRate * blockAlign, true);\n view.setUint16(32, blockAlign, true);\n view.setUint16(34, bitsPerSample, true);\n writeString(36, \"data\");\n view.setUint32(40, dataLength, true);\n\n const channels = Array.from({ length: numChannels }, (_, i) =>\n buffer.getChannelData(i),\n );\n let offset = 44;\n\n for (let i = 0; i < buffer.length; i++) {\n for (let channel = 0; channel < numChannels; channel++) {\n const sample = Math.max(-1, Math.min(1, channels[channel][i]));\n view.setInt16(\n offset,\n sample < 0 ? sample * 0x8000 : sample * 0x7fff,\n true,\n );\n offset += 2;\n }\n }\n\n return new Blob([arrayBuffer], { type: \"audio/wav\" });\n}\n\n/**\n * Apply 8-bit crush to an AudioBuffer (offline, non-realtime).\n * @param {AudioBuffer} buffer\n * @param {{ bitDepth?: number; sampleRate?: number; mix?: number; enabled?: boolean }} settings\n * @returns {AudioBuffer}\n */\nexport function crushBuffer(buffer, settings = {}) {\n const { bitDepth, sampleRate, mix, enabled } = {\n ...DEFAULT_SETTINGS,\n ...settings,\n };\n\n if (!enabled || mix <= 0) return buffer;\n\n const steps = Math.pow(2, bitDepth);\n const step = sampleRate / buffer.sampleRate;\n const output = new AudioBuffer({\n length: buffer.length,\n numberOfChannels: buffer.numberOfChannels,\n sampleRate: buffer.sampleRate,\n });\n\n for (let channel = 0; channel < buffer.numberOfChannels; channel++) {\n const input = buffer.getChannelData(channel);\n const out = output.getChannelData(channel);\n let phaser = 0;\n let lastSample = 0;\n\n for (let i = 0; i < input.length; i++) {\n const dry = input[i];\n\n phaser += step;\n if (phaser >= 1) {\n phaser -= 1;\n lastSample = dry;\n }\n\n let crushed = Math.floor(lastSample * steps) / steps;\n crushed = Math.max(-1, Math.min(1, crushed));\n out[i] = dry * (1 - mix) + crushed * mix;\n }\n }\n\n return output;\n}\n\n/**\n * Browser plugin for loading MP3s and applying 8-bit / chiptune effects.\n */\nexport class EightBitAudio {\n /** @type {AudioContext | null} */\n #context = null;\n\n /** @type {ArrayBuffer | null} */\n #rawArrayBuffer = null;\n\n /** @type {AudioBuffer | null} */\n #sourceBuffer = null;\n\n /** @type {AudioBufferSourceNode | null} */\n #sourceNode = null;\n\n /** @type {AudioWorkletNode | null} */\n #workletNode = null;\n\n /** @type {GainNode | null} */\n #gainNode = null;\n\n #workletReady = false;\n #loop = false;\n\n /** @type {HTMLAudioElement | null} */\n #audioElement = null;\n\n /** @type {string | null} */\n #objectUrl = null;\n\n /** @type {ReturnType | null} */\n #refreshTimer = null;\n\n /** @type {typeof DEFAULT_SETTINGS} */\n settings = { ...DEFAULT_SETTINGS };\n\n /**\n * @param {Partial} [initialSettings]\n */\n constructor(initialSettings = {}) {\n this.settings = { ...DEFAULT_SETTINGS, ...initialSettings };\n }\n\n async #ensureContext() {\n if (!this.#context) {\n this.#context = new AudioContext();\n }\n\n return this.#context;\n }\n\n async #ensureWorklet() {\n if (this.#workletReady) return true;\n\n const context = await this.#ensureContext();\n\n try {\n await context.audioWorklet.addModule(workletUrl);\n this.#workletReady = true;\n return true;\n } catch (error) {\n console.warn(\n \"EightBitAudio: worklet unavailable, using offline crush fallback.\",\n error,\n );\n return false;\n }\n }\n\n async #decodeSourceBuffer() {\n if (!this.#rawArrayBuffer) {\n throw new Error(\"No audio data loaded.\");\n }\n\n const context = await this.#ensureContext();\n this.#sourceBuffer = await context.decodeAudioData(\n this.#rawArrayBuffer.slice(0),\n );\n return this.#sourceBuffer;\n }\n\n /**\n * Bind a native HTMLAudioElement for reliable autoplay playback.\n * @param {HTMLAudioElement | null} element\n */\n bindAudioElement(element) {\n this.#audioElement = element;\n }\n\n async #getProcessedUrl() {\n const blob = await this.exportWav();\n if (this.#objectUrl) URL.revokeObjectURL(this.#objectUrl);\n this.#objectUrl = URL.createObjectURL(blob);\n return this.#objectUrl;\n }\n\n #applyElementVolume() {\n if (this.#audioElement) {\n this.#audioElement.volume = this.settings.volume;\n }\n }\n\n async prepareElement() {\n if (!this.#audioElement || !this.#sourceBuffer) {\n throw new Error(\"Bind an audio element and load a track first.\");\n }\n\n const url = await this.#getProcessedUrl();\n this.#audioElement.src = url;\n this.#audioElement.loop = true;\n this.#audioElement.preload = \"auto\";\n this.#applyElementVolume();\n }\n\n /**\n * Prepare the crushed track on the bound audio element and autoplay.\n */\n async tryAutoplay() {\n if (!this.#audioElement) {\n throw new Error(\"No audio element bound.\");\n }\n\n await this.prepareElement();\n await this.#audioElement.play();\n }\n\n async #refreshElementPlayback() {\n const element = this.#audioElement;\n if (!element || !this.#sourceBuffer) return;\n\n const wasPlaying = !element.paused;\n const currentTime = element.currentTime;\n await this.prepareElement();\n element.currentTime = currentTime;\n\n if (wasPlaying) {\n try {\n await element.play();\n } catch {\n // autoplay policy may block resume\n }\n }\n }\n\n /**\n * Call synchronously inside a click/tap handler to satisfy autoplay policy.\n */\n resumeFromGesture() {\n if (!this.#context) {\n this.#context = new AudioContext();\n }\n\n void this.#context.resume();\n }\n\n /**\n * Load an MP3 (or any browser-decodable audio) from a File.\n * @param {File | Blob} file\n */\n async load(file) {\n this.#rawArrayBuffer = await file.arrayBuffer();\n return this.#decodeSourceBuffer();\n }\n\n /**\n * Fetch audio bytes without starting playback.\n * @param {string} url\n */\n async loadFromUrl(url) {\n const response = await fetch(url);\n if (!response.ok)\n throw new Error(`Failed to fetch audio: ${response.status}`);\n this.#rawArrayBuffer = await response.arrayBuffer();\n return this.#decodeSourceBuffer();\n }\n\n /**\n * Update effect settings. Applies immediately during playback.\n * @param {Partial} next\n */\n updateSettings(next) {\n const wasPlaying = this.isPlaying;\n const loop = this.#loop;\n\n this.settings = { ...this.settings, ...next };\n this.#applyElementVolume();\n this.#applyWorkletParams();\n this.#applyVolume();\n\n if (this.#audioElement && this.#sourceBuffer) {\n if (this.#refreshTimer) clearTimeout(this.#refreshTimer);\n this.#refreshTimer = setTimeout(() => {\n void this.#refreshElementPlayback();\n }, 250);\n return;\n }\n\n if (wasPlaying && !this.#workletReady) {\n void this.start({ loop });\n }\n }\n\n /**\n * Apply a named preset.\n * @param {EightBitPreset} preset\n */\n setPreset(preset) {\n const values = PRESETS[preset];\n if (!values) throw new Error(`Unknown preset: ${preset}`);\n this.updateSettings({ ...values, enabled: true });\n }\n\n #getPlaybackBuffer() {\n if (!this.#sourceBuffer) {\n throw new Error(\"Load an audio file before playing.\");\n }\n\n if (this.#workletReady) return this.#sourceBuffer;\n\n return crushBuffer(this.#sourceBuffer, this.settings);\n }\n\n #applyWorkletParams() {\n if (!this.#workletNode) return;\n const { bitDepth, sampleRate, mix, enabled } = this.settings;\n this.#workletNode.parameters.get(\"bitDepth\").value = bitDepth;\n this.#workletNode.parameters.get(\"sampleRate\").value = sampleRate;\n this.#workletNode.parameters.get(\"mix\").value = mix;\n this.#workletNode.parameters.get(\"enabled\").value = enabled ? 1 : 0;\n }\n\n #applyVolume() {\n if (!this.#gainNode) return;\n this.#gainNode.gain.value = this.settings.volume;\n }\n\n #buildGraph() {\n if (!this.#context || !this.#sourceBuffer) {\n throw new Error(\"Load an audio file before playing.\");\n }\n\n this.stop();\n\n this.#sourceNode = this.#context.createBufferSource();\n this.#sourceNode.buffer = this.#getPlaybackBuffer();\n this.#gainNode = this.#context.createGain();\n\n if (this.#workletReady) {\n this.#workletNode = new AudioWorkletNode(\n this.#context,\n \"eight-bit-processor\",\n );\n this.#sourceNode.connect(this.#workletNode);\n this.#workletNode.connect(this.#gainNode);\n this.#applyWorkletParams();\n } else {\n this.#sourceNode.connect(this.#gainNode);\n }\n\n this.#gainNode.connect(this.#context.destination);\n this.#applyVolume();\n }\n\n /**\n * Start playback with 8-bit processing (non-blocking).\n * @param {{ loop?: boolean }} [options]\n */\n async start(options = {}) {\n const { loop = false } = options;\n this.#loop = loop;\n\n const context = await this.#ensureContext();\n\n if (context.state === \"suspended\") {\n await context.resume();\n }\n\n this.#buildGraph();\n\n this.#sourceNode.loop = loop;\n this.#sourceNode.onended = () => {\n if (!this.#sourceNode?.loop) this.stop();\n };\n this.#sourceNode.start(0);\n }\n\n /**\n * Play the loaded track and resolve when finished.\n * @param {{ loop?: boolean }} [options]\n */\n async play(options = {}) {\n const { loop = false } = options;\n await this.start({ loop });\n\n if (loop) return;\n\n return new Promise((resolve) => {\n if (!this.#sourceNode) {\n resolve();\n return;\n }\n\n this.#sourceNode.onended = () => {\n this.stop();\n resolve();\n };\n });\n }\n\n /** Stop current playback. */\n stop() {\n if (this.#sourceNode) {\n try {\n this.#sourceNode.stop();\n } catch {\n // already stopped\n }\n this.#sourceNode.disconnect();\n this.#sourceNode = null;\n }\n\n if (this.#workletNode) {\n this.#workletNode.disconnect();\n this.#workletNode = null;\n }\n\n if (this.#gainNode) {\n this.#gainNode.disconnect();\n this.#gainNode = null;\n }\n }\n\n /**\n * Render the full track with current settings and return a WAV Blob.\n * @returns {Promise}\n */\n async exportWav() {\n if (!this.#sourceBuffer)\n throw new Error(\"Load an audio file before exporting.\");\n\n const crushed = crushBuffer(this.#sourceBuffer, this.settings);\n return encodeWav(crushed);\n }\n\n /**\n * Trigger a browser download of the processed WAV.\n * @param {string} [filename]\n */\n async download(filename = \"8bit-track.wav\") {\n const blob = await this.exportWav();\n const url = URL.createObjectURL(blob);\n const anchor = document.createElement(\"a\");\n anchor.href = url;\n anchor.download = filename;\n anchor.click();\n URL.revokeObjectURL(url);\n }\n\n /** @returns {boolean} */\n get isPlaying() {\n if (this.#audioElement) return !this.#audioElement.paused;\n return this.#sourceNode !== null;\n }\n\n /** @returns {boolean} */\n get needsUnlock() {\n return this.#context?.state === \"suspended\";\n }\n\n /** @returns {boolean} */\n get isLoaded() {\n return this.#sourceBuffer !== null;\n }\n\n /** @returns {number | null} Duration in seconds. */\n get duration() {\n return this.#sourceBuffer?.duration ?? null;\n }\n\n /** Release audio resources. */\n destroy() {\n this.stop();\n\n if (this.#audioElement) {\n this.#audioElement.pause();\n this.#audioElement.removeAttribute(\"src\");\n }\n\n if (this.#refreshTimer) clearTimeout(this.#refreshTimer);\n if (this.#objectUrl) URL.revokeObjectURL(this.#objectUrl);\n\n this.#context?.close();\n this.#context = null;\n this.#sourceBuffer = null;\n this.#rawArrayBuffer = null;\n this.#audioElement = null;\n this.#objectUrl = null;\n this.#workletReady = false;\n 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