daniel/deepdrft
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases 13 Wiki Activity

docs: record Phase 1.2 Wave 2 progress; update PLAN.md and DeepDrftPublic.Client CLAUDE.md

Browse Source
This commit is contained in:
daniel-c-harvey
2026-06-11 09:13:04 -04:00
parent 98142754fa
commit 0439d3da4f
2 changed files with 6 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files
DeepDrftPublic.Client/CLAUDE.md
+5 -4
View File
@@ -76,11 +76,12 @@ Both are configured with JSON serializer settings (case-insensitive property mat
### Format decoders (TypeScript)
New modules in `DeepDrftPublic/Interop/audio/`:
- `IFormatDecoder.ts`: Interface. Defines contract for format-specific decoders: `parseHeader(chunk, offset)` → header metadata; `decodeChunk(chunk, offset)` → `AudioBuffer`.
- `WavFormatDecoder.ts`: Concrete WAV implementation. Parses RIFF/WAVE structure, fmt and data chunks. All WAV-specific byte-parsing logic lives here. Exported as the default WAV decoder.
- Future decoders: MP3, FLAC, etc. (TBD).
- `IFormatDecoder.ts`: Interface. Defines contract for format-specific decoders: `parseHeader(chunk, offset)` → header metadata; `decodeChunk(chunk, offset)` → `AudioBuffer`; `getAlignedSegmentSize(chunk, offset, rawData?)` → frame-aligned segment boundary (optional `rawData` parameter for format-specific frame-boundary scanning).
- `WavFormatDecoder.ts`: Concrete WAV implementation (active). Parses RIFF/WAVE structure, fmt and data chunks. All WAV-specific byte-parsing logic lives here. Exported as the default WAV decoder.
- `Mp3FormatDecoder.ts`: Concrete MP3 implementation (implemented, not yet wired). Implements `IFormatDecoder` for MP3: ID3v2 skip, MPEG Layer III frame-sync + header decode (MPEG1/2/2.5), Xing/Info/VBRI VBR-header detection (frame count + 100-entry TOC for seek), CBR frame-aligned segment sizing, VBR TOC-interpolation seek (`calculateByteOffset`), zero-copy `wrapSegment` (raw MP3 frames are self-contained). CBR sub-frame tail guard prevents over-read.
- `FlacFormatDecoder.ts`: Concrete FLAC implementation (implemented, not yet wired). Implements `IFormatDecoder` for FLAC: scans all metadata blocks (STREAMINFO mandatory, SEEKTABLE optional), extracts 20-bit sample rate / 3-bit channels / 5-bit bitsPerSample / 36-bit total-samples from bit-packed STREAMINFO, builds 38-byte synthetic STREAMINFO block for per-segment wrapping, binary-search SEEKTABLE for seek. `wrapSegment` prepends `fLaC + STREAMINFO` to each audio segment so `decodeAudioData` sees a valid FLAC stream. `getAlignedSegmentSize` scans backward through peek bytes for the `0xFF/(0xF8|0xF9)` FLAC frame sync so each segment ends on a real frame boundary.
`StreamDecoder.ts` remains the orchestrator — it accepts the first chunk, selects the right format decoder via factory (based on `contentType`), delegates all format-specific work to it, and chains subsequent chunks through the same decoder instance.
`StreamDecoder.ts` remains the orchestrator — it accepts the first chunk, selects the right format decoder via factory (based on `contentType`), peeks candidate bytes before calling `getAlignedSegmentSize` (non-destructive read), passes them as `rawData`, and uses zero-copy `subarray` for the actual segment. It delegates all format-specific work to the decoder and chains subsequent chunks through the same decoder instance. `Mp3FormatDecoder` and `FlacFormatDecoder` are implemented modules but not yet wired into `AudioPlayer.createFormatDecoder` factory (Wave 3 pending).
### Component integration
- `AudioPlayerProvider.razor` is the cascading host. It injects `IStreamingPlayerService` (resolved to `StreamingAudioPlayerService` in DI), stores it in a cascade with `IsFixed="true"`, and keeps it alive across navigation.