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add link to AudioTee.js

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Nick Payne
2025-07-27 19:12:13 +01:00
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README.md
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**⚠️ API Instability Warning: The AudioTee API is unstable at present and subject to change without notice.** **⚠️ API Instability Warning: The AudioTee API is unstable at present and subject to change without notice.**
AudioTee captures your Mac's system audio output and writes it in PCM encoded chunks to `stdout` at regular intervals. All logging and metadata information is written to `stderr`, meaning at its simplest you can AudioTee captures your Mac's system audio output and writes it in PCM encoded chunks to `stdout` at regular intervals. All logging and metadata information is written to `stderr`, meaning at its simplest you can capture system audio to a file like this:
capture system audio to a file like this:
```bash ```bash
/path/to/audiotee > output.pcm /path/to/audiotee > output.pcm
``` ```
It's more likely that you want to capture this output programmatically. Check out [AudioTee.js](https://github.com/makeusabrew/audioteejs) for a simple Node.js package.
System audio is captured using the [Core Audio taps](https://developer.apple.com/documentation/coreaudio/capturing-system-audio-with-core-audio-taps) API introduced in macOS 14.2 (released in December 2023). You can do whatever you want with this audio - stream it somewhere else, save it to disk, visualise it, etc. System audio is captured using the [Core Audio taps](https://developer.apple.com/documentation/coreaudio/capturing-system-audio-with-core-audio-taps) API introduced in macOS 14.2 (released in December 2023). You can do whatever you want with this audio - stream it somewhere else, save it to disk, visualise it, etc.
By default, audiotee captures audio output from **all** running processes. Tap output is forced to `mono` (not yet configurable) and preserves your output device's sample rate (configurable via the `--sample-rate` flag). Only the default output device is currently supported. By default, audiotee captures audio output from **all** running processes. Tap output is forced to `mono` (not yet configurable) and preserves your output device's sample rate (configurable via the `--sample-rate` flag). Only the default output device is currently supported.