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Powered by [Takahiro’s nes-js](https://github.com/takahirox/nes-js/blob/master/src/Apu.js)’s [APU](https://github.com/takahirox/nes-js/blob/master/src/Apu.js) code (imported directly!).\n\n### → [Demo](https://dtinth.github.io/nes-apu-worklet)\n\n## Usage\n\n```js\nimport { NesApuNode } from 'https://cdn.jsdelivr.net/npm/@dtinth/nes-apu-worklet@1/nes-apu-node.js'\nconst context = new AudioContext()\n```\n\n### Add a worklet module to your `AudioContext`\n\n```js\nawait context.audioWorklet.addModule(\n  'https://cdn.jsdelivr.net/npm/@dtinth/nes-apu-worklet@1/nes-apu-worklet.js',\n)\n```\n\n### Create a `NesApuNode`\n\n```js\nlet apu = new NesApuNode(context)\napu.connect(context.destination)\n```\n\n### Schedule writes to the APU registers\n\n```js\n//                      * Status register\n//                      |            * Disable DMC channel\n//                      |            |* Disable Noise channel\n//                      |            ||* Disable Triangle channel\n//                      |            |||* Disable Pulse 2 channel\n//                      |            ||||* Enable Pulse 1 channel\napu.storeRegisterAtTime(0x4015, 0b00000001, context.currentTime)\n//                      * Pulse 1\n//                      |         ** Duty cycle 12.5%\n//                      |         ||* Disable length counter (do not silence notes automatically)\n//                      |         |||* Use constant volume (no decay)\n//                      |         ||||**** Volume 15/15\napu.storeRegisterAtTime(0x4000, 0b00111111)\n//                      |         ******** = Timer low = 251\napu.storeRegisterAtTime(0x4002, 0b11111011)\n//                      |         ***** Length counter (disabled)\n//                      |         |||||*** = Timer high = 1\napu.storeRegisterAtTime(0x4003, 0b00000001)\n//                      Timer = 1 * 256 + 251 = 507\n//                      Frequency = 1789773 [CPU speed hz] / (16 * (507 [Timer] + 1))\n//                                = 220.1984498031496 hz (~A below Middle C)\n```\n\n## API\n\n### `const apu = new NesApuNode(audioContext)`\n\nCreates a new NES APU node.\n\n### `apu.storeRegisterAtTime(address, value, time)`\n\nEnqueues a command to write a value to the APU registers. Check out [Nesdev wiki](https://wiki.nesdev.com/w/index.php/APU#Registers) for reference of each register.\n\n### `apu.port.onmessage = fn`\n\nBe notified when data is written to the APU register. `fn` is called with `event` object.\n\n- `event.data.address` — Register address\n- `event.data.value` — Register value\n- `event.data.time` — Audio time\n","readmeFilename":"README.md"}