The audio_service package manages streaming audio from a URL. Is there a way to simultaneously write the audio to disk as well?
Note: In python, one can do this by setting stream=True when calling requests methods. I'm looking for a way to do this via a flutter package.
The audio_service package manages streaming audio from a URL.
audio_service doesn't manage streaming audio, it manages your media notification. The way it works is: let's say you have already written an app that plays audio using some plugin XYZ, but you want to now just add a media notification so that your app can be controlled from the background. Then you use audio_service to wrap around your "existing" audio code.
So your question is really about what to do for your existing audio code which audio_service wraps around.
If you are following the audio_service official example, it demonstrates using the just_audio plugin to stream audio from a URL, so let's answer in terms of that. You can easily modify the official example by using just_audio's LockCachingAudioSource.
So for example, whenever in that example you see AudioSource.uri, just replace that code with LockCachingAudioSource and it will do what you want. That's it.
But to demonstrate some of the capabilities of LockCachingAudioSource in a bit more detail, here is a short demo of the way it works:
final source = LockCachingAudioSource(Uri.parse(url));
await player.setAudioSource(source);
await player.play();
The location of the cache file is by default chosen by the plugin, but you can obtain it here:
final cacheFile = await source.cacheFile;
You can clear the cache with:
await source.clearCache();
If you want to choose the location of the cache file, you can do so when constructing the source:
final source = LockCachingAudioSource(
Uri.parse(url),
cacheFile: File('/your/preferred/path.mp3'),
);