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Diffstat (limited to 'doc')
| -rw-r--r-- | doc/AUDIO_WAV_DRIFT_BUG.md | 17 |
1 files changed, 14 insertions, 3 deletions
diff --git a/doc/AUDIO_WAV_DRIFT_BUG.md b/doc/AUDIO_WAV_DRIFT_BUG.md index e22f4fa..050dd49 100644 --- a/doc/AUDIO_WAV_DRIFT_BUG.md +++ b/doc/AUDIO_WAV_DRIFT_BUG.md @@ -1,7 +1,8 @@ # Audio WAV Drift Bug Investigation **Date:** 2026-02-15 -**Status:** ROOT CAUSE IDENTIFIED +**Status:** ACCEPTABLE (to be continued) +**Current State:** -150ms drift at beat 64b, no glitches ## Problem Statement @@ -163,8 +164,18 @@ Eliminates cumulative truncation error. 1. ✅ Measure WAV sample positions directly (Python script) 2. ✅ Add render tracking debug output 3. ✅ Confirm over-rendering (366ms per 10s) -4. ⏳ Implement fix -5. ⏳ Verify corrected WAV alignment in viewer +4. ✅ Implement partial fix (bypass ring buffer, direct render) +5. ⚠️ Current result: -150ms drift at beat 64b (acceptable, needs further work) + +## Current Implementation (main.cc:286-308) + +**WAV dump now bypasses ring buffer entirely:** +1. **Frame accumulator**: Calculates exact frames per update (no truncation) +2. **Direct render**: Calls `synth_render()` directly with exact frame count +3. **No ring buffer**: Eliminates buffer management complexity +4. **Result**: No glitches, but -150ms drift remains + +**Remaining issue:** Drift persists despite direct rendering. Likely related to tempo scaling or audio engine state management. Acceptable for now. ## Notes |