docs(phase-20): complete phase execution

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2026-03-19 14:07:56 -04:00
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| 17. Single Track Edit | v1.2 | 2/2 | Complete | 2026-03-18 |
| 18. Batch Edit | v1.2 | 2/2 | Complete | 2026-03-18 |
| 19. WAV Tag Writer | 2/2 | Complete | 2026-03-19 | - |
| 20. OGG Vorbis Tag Writer | 2/2 | Complete | 2026-03-19 | - |
| 20. OGG Vorbis Tag Writer | 2/2 | Complete | 2026-03-19 | - |
| 21. Cleanup | v1.2.1 | 0/? | Not started | - |
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gsd_state_version: 1.0
milestone: v1.0
milestone_name: milestone
status: in-progress
last_updated: "2026-03-19T18:02:38Z"
status: unknown
last_updated: "2026-03-19T18:07:52.236Z"
progress:
total_phases: 1
completed_phases: 1
total_phases: 2
completed_phases: 2
total_plans: 4
completed_plans: 4
---
@@ -0,0 +1,100 @@
---
phase: 20-ogg-vorbis-tag-writer
verified: 2026-03-19T18:15:00Z
status: passed
score: 13/13 must-haves verified
---
# Phase 20: OGG Vorbis Tag Writer Verification Report
**Phase Goal:** Users can edit metadata and cover art on OGG Vorbis files with the same experience as MP3/FLAC/WAV
**Verified:** 2026-03-19T18:15:00Z
**Status:** passed
**Re-verification:** No — initial verification
## Goal Achievement
### Observable Truths
#### Plan 01 Truths
| # | Truth | Status | Evidence |
|---|-------|--------|----------|
| 1 | writeOggTags function compiles and is reachable from the pipeline switch | ✓ VERIFIED | `go build ./backend/tagwriter/` passes; pipeline.go:149-150 dispatches `case FormatOGG: err = writeOggTags(...)` |
| 2 | OGG pages are parsed with lenient CRC and re-serialized with correct MSB-first CRC32 | ✓ VERIFIED | ogg.go:152-158 logs CRC mismatch warnings but continues; TestOggCRC_KnownVectors passes with 3 independent vectors + self-consistency check |
| 3 | Vorbis Comment fields are preserved byte-for-byte when not edited | ✓ VERIFIED | ogg_vorbis.go uses `[][]byte` for raw entries; TestWriteOggTags_PartialUpdate confirms unchanged fields survive |
| 4 | Edited fields use uppercase field names and replace all existing entries for that field | ✓ VERIFIED | ogg_vorbis.go:118 uses `strings.ToUpper(field)`, line 122 filters case-insensitively with `bytes.ToUpper` |
| 5 | Cover art is written as base64-encoded METADATA_BLOCK_PICTURE; legacy COVERART/COVERARTMIME fields are stripped | ✓ VERIFIED | ogg_vorbis.go:244-246 strips all 3 field types; line 256 base64-encodes; TestWriteOggTags_CoverArt and _ClearCoverArt pass |
| 6 | Multi-stream and non-Vorbis OGG files are rejected with clear error messages | ✓ VERIFIED | ogg.go:189 checks serial count >1 or bosCount >1; ogg.go:195-198 checks `\x01vorbis`; TestWriteOggTags_RejectNonVorbis and _RejectMultiStream pass |
| 7 | File writes use AtomicWrite for crash safety | ✓ VERIFIED | ogg.go:459 calls `fileutil.AtomicWrite`; TestWriteOggTags_AtomicSafety verifies corrupt files untouched |
#### Plan 02 Truths
| # | Truth | Status | Evidence |
|---|-------|--------|----------|
| 8 | All 8 text fields round-trip correctly through writeOggTags and dhowden/tag read-back | ✓ VERIFIED | TestWriteOggTags_TextFields passes — all 9 values (8 fields + composer) verified via metadata.ExtractTags |
| 9 | Non-edited Vorbis Comment fields survive a partial update | ✓ VERIFIED | TestWriteOggTags_PartialUpdate: writes all fields, updates 2, verifies remaining 7 unchanged |
| 10 | Audio page data is byte-identical after tag write | ✓ VERIFIED | TestWriteOggTags_AudioPreservation: captures audio bytes before/after, `bytes.Equal` assertion passes |
| 11 | Cover art can be embedded, replaced, and cleared via METADATA_BLOCK_PICTURE | ✓ VERIFIED | TestWriteOggTags_CoverArt (embed+verify JPEG), TestWriteOggTags_ClearCoverArt (add→verify→clear→verify nil) |
| 12 | Failed writes leave the original file untouched (atomic safety) | ✓ VERIFIED | TestWriteOggTags_AtomicSafety: corrupt file unchanged after error, valid file unchanged after unrelated failure |
| 13 | CRC32 implementation produces correct checksums (validated against known vectors) | ✓ VERIFIED | TestOggCRC_KnownVectors: empty→0x0, "OggS"→0x5fb0a94f, {1..8}→0x7d0f3681, plus fixture page self-consistency |
**Score:** 13/13 truths verified
### Required Artifacts
| Artifact | Expected | Status | Details |
|----------|----------|--------|---------|
| `backend/tagwriter/ogg.go` | OGG page parser/writer, CRC32, writeOggTags (min 200 lines) | ✓ VERIFIED | 575 lines; CRC table, page parser/writer, packet extraction/splitting, writeOggTags pipeline, AtomicWrite |
| `backend/tagwriter/ogg_vorbis.go` | Vorbis Comment parse/serialize, field manipulation, cover art (min 100 lines) | ✓ VERIFIED | 259 lines; parseVorbisCommentPacket, serializeVorbisCommentPacket, replaceField, removeField, buildMetadataBlockPicture, applyOggCoverArt |
| `backend/tagwriter/tagwriter.go` | FormatOGG constant and .ogg case in DetectFormat | ✓ VERIFIED | Line 42: `FormatOGG AudioFormat = "ogg"`, lines 59-60: `case ".ogg": return FormatOGG, nil` |
| `backend/tagwriter/pipeline.go` | case FormatOGG dispatch to writeOggTags | ✓ VERIFIED | Lines 149-150: `case FormatOGG: err = writeOggTags(tw.logger, audioFile.FilePath, changes)` |
| `backend/tagwriter/ogg_test.go` | Round-trip tests, CRC validation, fixture builder (min 300 lines) | ✓ VERIFIED | 659 lines; 10 test functions, programmatic OGG fixture builder, 3 CRC known vectors + self-consistency |
### Key Link Verification
| From | To | Via | Status | Details |
|------|----|-----|--------|---------|
| pipeline.go | ogg.go | `case FormatOGG``writeOggTags` | ✓ WIRED | pipeline.go:149-150 dispatches to writeOggTags |
| ogg.go | ogg_vorbis.go | `parseVorbisCommentPacket` / `serializeVorbisCommentPacket` | ✓ WIRED | ogg.go:417 calls parseVorbisCommentPacket, ogg.go:429 calls serializeVorbisCommentPacket |
| ogg.go | fileutil/atomicwrite.go | `fileutil.AtomicWrite` | ✓ WIRED | ogg.go:459 calls fileutil.AtomicWrite(logger, filePath, func...) |
| ogg_test.go | ogg.go | `writeOggTags`, `parseOggPages`, `oggCRC` | ✓ WIRED | 27 references across all test functions |
| ogg_test.go | metadata/tags.go | `metadata.ExtractTags` for read-back | ✓ WIRED | 10 references for dhowden/tag read-back verification |
### Requirements Coverage
| Requirement | Source Plan | Description | Status | Evidence |
|-------------|------------|-------------|--------|----------|
| OGG-01 | 20-01, 20-02 | Edit all 8 text metadata fields on OGG Vorbis | ✓ SATISFIED | ogg_vorbis.go field mappings (lines 148-162), TestWriteOggTags_TextFields passes with all 9 values verified |
| OGG-02 | 20-01, 20-02 | Preserve non-edited Vorbis Comment fields | ✓ SATISFIED | Raw byte preservation ([][]byte entries), TestWriteOggTags_PartialUpdate verifies 7 unchanged fields |
| OGG-03 | 20-01, 20-02 | Preserve audio data identically (lossless round-trip) | ✓ SATISFIED | Audio pages copied byte-for-byte (ogg.go:451), TestWriteOggTags_AudioPreservation compares bytes |
| OGG-04 | 20-01, 20-02 | Embed, replace, remove cover art via METADATA_BLOCK_PICTURE | ✓ SATISFIED | buildMetadataBlockPicture + base64 + legacy stripping, TestWriteOggTags_CoverArt and _ClearCoverArt pass |
| OGG-05 | 20-01, 20-02 | Crash-safe atomic writes | ✓ SATISFIED | fileutil.AtomicWrite at ogg.go:459, TestWriteOggTags_AtomicSafety verifies file integrity on failure |
| OGG-06 | 20-02 | Round-trip tests verify via dhowden/tag read-back | ✓ SATISFIED | All 7 TestWriteOggTags_* functions use metadata.ExtractTags (dhowden/tag); 10 read-back call sites |
**No orphaned requirements.** All 6 OGG requirements (OGG-01 through OGG-06) are mapped in REQUIREMENTS.md to Phase 20 and accounted for in plan frontmatters.
### Anti-Patterns Found
| File | Line | Pattern | Severity | Impact |
|------|------|---------|----------|--------|
| — | — | None found | — | — |
No TODOs, FIXMEs, placeholders, stub implementations, or console.log patterns found in any OGG files.
### Human Verification Required
None. All phase requirements are verifiable through automated build, vet, and test checks. The round-trip tests use dhowden/tag as an independent reader, providing strong evidence that written files are valid OGG Vorbis.
### Gaps Summary
No gaps found. All 13 must-have truths are verified, all 5 artifacts pass all three levels (exists, substantive, wired), all 5 key links are wired, all 6 requirements are satisfied, and no anti-patterns were detected.
**Build:** `go build ./backend/tagwriter/` — passes clean
**Vet:** `go vet ./backend/tagwriter/` — passes clean
**Tests:** All 10 OGG test functions pass (0.03s), full tagwriter suite passes with zero regressions (0.41s)
---
_Verified: 2026-03-19T18:15:00Z_
_Verifier: Claude (gsd-verifier)_