feat: change default decoder to Symphonia and update feature flags

[roderickvd]

Not sure how controversial this may be? Probably for a next version.

Pros:

• seeking support
• unified architecture
• enhanced format support
• better error handling
• works in floating point
• support for metadata and channel maps

Cons:

• not as minimal as the other decoders
• probably biggest one: MPL license is weak copyleft

To counter that licensing point, the other decoders are still available as optional features.

Further changes:

• Cleaned up and documented Cargo.toml
• Added MP4 to the default features
• Added CAF/MKV/MP1/MP2 as optional features
• Changed ADPCM to become an optional feature (used to be enabled with symphonia-wav).

[Copilot]

Pull Request Overview

Switch default decoder to Symphonia and revise feature flags

• Change default format decoder to Symphonia; retain previous decoders (claxon, lewton, hound, etc.) as optional features
• Clean and document Cargo.toml with explicit feature definitions, including separate wav_output for WAV writing
• Update tests, source code, documentation, CHANGELOG, and CI to reflect renamed features

Reviewed Changes

Copilot reviewed 14 out of 14 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
tests/wav_test.rs	Updated #[cfg(feature = "wav")] to #[cfg(feature = "hound")]
tests/total_duration.rs	Swapped wav→hound and flac→claxon in test templates
tests/seek.rs	Replaced wav→hound and flac→claxon feature flags
tests/flac_test.rs	Changed #[cfg(feature = "flac")] to #[cfg(feature = "claxon")]
src/source/mod.rs	Renamed SeekError #[cfg(feature = "wav")] to #[cfg(feature = "hound")]
src/lib.rs	Moved WAV output module under wav_output instead of wav
src/decoder/mp3.rs	Adjusted sample type import from DecoderSample to Sample
src/decoder/mod.rs	Renamed feature gates: wav→hound, flac→claxon, vorbis→lewton
src/decoder/builder.rs	Applied same feature renames in DecoderBuilder
README.md	Updated bullet list to reflect default Symphonia decoders and optional backends
Cargo.toml	Overhauled [features] section; added wav_output, renamed decoders
CHANGELOG.md	Documented new default decoders and feature flag changes
.github/workflows/ci.yml	Extended CI to test alternative decoder feature sets

Comments suppressed due to low confidence (5)

src/source/mod.rs:652

• [nitpick] The error message refers to "wav source" but this variant is gated by the hound feature; consider updating it to mention "Hound decoder" or "WAV (Hound)" for clearer, consistent messaging.

SeekError::HoundDecoder(err) => write!(f, "Error seeking in wav source: {}", err),

README.md:11

• [nitpick] This bullet appears misaligned compared to the surrounding list items; ensure consistent indentation and prefix so it renders properly as part of the bullet list.

- FLAC by [claxon](https://github.com/ruuda/claxon).

Cargo.toml:14

• The default features include flac and wav, which now map to Symphonia backends; verify that this matches the intention, as the new optional claxon and hound features may cause confusion.

default = ["playback", "flac", "mp3", "mp4", "vorbis", "wav"]

tests/wav_test.rs:1

• The WAV test now only runs under the hound feature; consider adding a parallel test or adjusting the cfg so it also covers WAV decoding via the symphonia-wav feature, since that's now the default backend.

#[cfg(feature = "hound")]

src/lib.rs:175

• The new wav_output module is gated by the wav_output feature but currently lacks dedicated tests; consider adding tests for output_to_wav to validate WAV file generation.

#[cfg(feature = "wav_output")]

[dvdsk]

Not sure how controversial this may be? Probably for a next version.

We should check with Bevy and some other Rodio users. @will3942 whats your opinion on this change?

[will3942]

Not sure how controversial this may be? Probably for a next version.

We should check with Bevy and some other Rodio users. @will3942 whats your opinion on this change?

Thanks for flagging.

A less permissive license is always less desirable for us. MPL isn't a problem though and we already use Symphonia.

[dvdsk]

Bevy runs with default features false so it should not be an issue for them (as they have zero decoders enabled by default)

[dvdsk]

Could you add a section to the upgrade guide? Do we need to say something in the release announcement? (see outreach folder for the current draft in the 0.21 release branch).

[roderickvd]

Sure - you mean you want to target it for v0.21?

[dvdsk]

Sure - you mean you want to target it for v0.21?

Why not :)

[roderickvd]

Could you add a section to the upgrade guide? Do we need to say something in the release announcement? (see outreach folder for the current draft in the 0.21 release branch).

Done in dd2a49b.

I think we can skip it in the release announcement; it should be all the same to 99.9% of existing users.

[dvdsk]

@PetrGlad would you agree with these changes? (no need for full review though one is always welcome).

[alice-i-cecile]

Bevy runs with default features false so it should not be an issue for them (as they have zero decoders enabled by default)

Bevy maintainer here: yep, this won't cause any problems for our users as a result.