Add band-limited update scaffolding #23
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WalkthroughA new "band-limited" audio update mode infrastructure has been added to the APU module. This includes new constants, data structures, and logic for band-limited audio synthesis, as well as extended state serialization to support the new update mode. The changelog has been updated to reflect this addition. Changes
Sequence Diagram(s)sequenceDiagram
participant User
participant Apu
participant BandLimited
User->>Apu: set_update_mode(UpdateMode::BandLimited)
User->>Apu: process_audio(input_sample, phase)
Apu->>BandLimited: band_limited_update(bl, input_sample, phase)
BandLimited-->>Apu: update circular buffer with band-limited steps
Apu-->>User: processed audio sample
Poem
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Actionable comments posted: 0
🧹 Nitpick comments (3)
src/apu.rs (3)
39-42: Consider adding documentation for the band-limited constants.These constants would benefit from documentation explaining their purpose and the choice of values, especially the fixed-point representation.
+/// Width of the band-limited filter kernel (number of samples) const BAND_LIMITED_WIDTH: usize = 16; +/// Number of discrete phases for band-limited step interpolation const BAND_LIMITED_PHASES: usize = 512; +/// Fixed-point representation of 1.0 (16.16 fixed-point format) const BAND_LIMITED_ONE: i32 = 0x10000;
86-103: Unused band-limited update function.This function appears to be scaffolding for future band-limited audio implementation. The implementation looks correct but is not integrated into the audio processing pipeline yet.
Would you like me to help integrate this function into the audio clock cycle or create an issue to track the full implementation of band-limited audio processing?
211-223: Unused band-limited data structures.The
BlSampleandBandLimitedstructs are defined but not used in the current implementation. Consider adding a TODO comment to indicate these are for future band-limited audio processing.+// TODO: These structures will be used for band-limited audio processing implementation #[derive(Clone, Copy, Default)] struct BlSample { left: i32, right: i32, } #[derive(Default)] struct BandLimited { buffer: [BlSample; BAND_LIMITED_WIDTH * 2], output: BlSample, pos: u8, input: BlSample, }
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CHANGELOG.md(1 hunks)src/apu.rs(13 hunks)
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🔇 Additional comments (7)
src/apu.rs (6)
7-7: LGTM!The
OnceLockimport is correctly added for the lazy initialization of band-limited steps.
46-84: Well-implemented band-limited step generation!The mathematical approach using odd harmonics and normalization is correct for band-limited synthesis. The error distribution in the fixed-point conversion ensures accuracy.
122-165: LGTM!The
UpdateModeenum implementation follows the established pattern and includes all necessary trait implementations for serialization and display.
330-330: LGTM!The
update_modefield is properly integrated into theApustruct with appropriate initialization, reset behavior, and accessor methods.Also applies to: 426-426, 506-506, 1080-1086
1528-1528: LGTM!State serialization and deserialization for
update_modeis correctly implemented following the established pattern.Also applies to: 1620-1620
1636-1636: LGTM!Test updates correctly account for the new
update_modefield:
- Import added for the new test
- State size correctly increased by 1 byte
- New test properly verifies update_mode preservation through state save/load cycle
Also applies to: 1769-1769, 1908-1918
CHANGELOG.md (1)
13-13: LGTM!The changelog entry accurately documents the new band-limited audio update mode infrastructure.
Summary
UpdateModeenum and band-limited step generatorTesting
cargo fmt --allcargo clippy --fix --allow-dirty --allow-staged --all-features --all-targetsblack .cargo test --all-targets --features simd,debug,pythonhttps://chatgpt.com/codex/tasks/task_e_6848a51d57d08328920634d4d3317a2e
Summary by CodeRabbit
New Features
Documentation