Loading sound and music directly from memory

[kaphula]

How do you load sound effects and music directly from memory the right way?

I am trying to create a chunk from a memory loaded sound file, .wav in this case, but it could .ogg as well.

let chunk = sdl2::mixer::Chunk::from_raw_buffer(up.raw_data.clone().into_boxed_slice()).unwrap();

But it does not work, when I play the sound all I hear is noise. I assume I need for SDL2 to recognize the loaded audio type and load it accordingly, but Chunk::from_raw_buffer does not do any of that work, as hinted by its documentation.

Does the API offer a safe way to load sounds as chunks from memory?

EDIT:

I managed to get it to work by writing the in-memory file back to disk as a file, then reading that file using the API, but that does not sound very smart. Is this the only way?

      let temp_path = std::env::temp_dir().join("temp_audio_file");
      std::fs::File::create(&temp_path)?.write_all(&up.raw_data)?;
      let chunk = sdl2::mixer::Chunk::from_file(&temp_path)?;

[Cobrand]

To be honest the mixer side of this crate is pretty underimplemented. Normally you have exactly your use case where you can use a RWOps (SDL2 version of a memory buffer) instead of a file, but this part is currently unimplemented.

If you want, feel free to implement it yourself, it should be pretty easy starting from there: https://docs.rs/sdl2/latest/src/sdl2/mixer/mod.rs.html#256-259

EDIT:

Using https://docs.rs/sdl2/latest/sdl2/rwops/struct.RWops.html#method.from_bytes instead of from_file should be pretty easy, and I don't think the RWops needs to be alive once it has been decoded once, so you don't even have to care about lifetimes here.

[kaphula]

I see. I'll see what I can do.

[kaphula]

Oh I did not understand that you meant it is already possible with RWops. I suppose this is what you meant:

   let sound_as_bytes = include_bytes!("sound.ogg");
   let b = RWops::from_bytes(sound_as_bytes)?;
   let chunk = b.load_wav()?;
   sdl2::mixer::Channel::all().play(&chunk, 1)?;

At least it is working as intended, the ogg gets played correctly. Maybe the load_wav() is a bit misleading, but then again, that is how it is named in SDL2 too even though it handles loading ogg files.

EDIT:

This still causes issues with lifetimes if RWops is dropped before the created Music. Chunk works as it does not tie lifetime.