From a6a7bf0440dbabdc6c994c0fb21a8ac31c27be07 Mon Sep 17 00:00:00 2001 From: skal Date: Sat, 7 Feb 2026 14:00:23 +0100 Subject: feat(audio): Add SilentBackend, fix peak measurement, reorganize backends MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit ## Critical Fixes **Peak Measurement Timing:** - Fixed 400ms audio-visual desync by measuring peak at playback time - Added get_realtime_peak() to AudioBackend interface - Implemented real-time measurement in MiniaudioBackend audio callback - Updated main.cc and test_demo.cc to use audio_get_realtime_peak() **Peak Decay Rate:** - Fixed slow decay (0.95 → 0.7 per callback) - Old: 5.76 seconds to fade to 10% (constant flashing in test_demo) - New: 1.15 seconds to fade to 10% (proper visual sync) ## New Features **SilentBackend:** - Test-only backend for testing audio.cc without hardware - Controllable peak for testing edge cases - Tracks frames rendered and voice triggers - Added 7 comprehensive tests covering: - Lifecycle (init/start/shutdown) - Peak control and tracking - Playback time and buffer management - Integration with AudioEngine ## Refactoring **Backend Organization:** - Created src/audio/backend/ directory - Moved all backend implementations to subdirectory - Updated include paths and CMakeLists.txt - Cleaner codebase structure **Code Cleanup:** - Removed unused register_spec_asset() function - Added deprecation note to synth_get_output_peak() ## Testing - All 28 tests passing (100%) - New test: test_silent_backend - Improved audio.cc test coverage significantly ## Documentation - Created PEAK_FIX_SUMMARY.md with technical details - Created TASKS_SUMMARY.md with complete task report Co-Authored-By: Claude Sonnet 4.5 --- src/audio/synth.h | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'src/audio/synth.h') diff --git a/src/audio/synth.h b/src/audio/synth.h index cb0d1df..ba96167 100644 --- a/src/audio/synth.h +++ b/src/audio/synth.h @@ -44,4 +44,8 @@ void synth_set_tempo_scale( float tempo_scale); // Set playback speed (1.0 = normal) int synth_get_active_voice_count(); + +// Get peak amplitude of synthesized audio (measured at ring buffer write time) +// NOTE: For audio-visual synchronization, use audio_get_realtime_peak() instead +// This function measures peak ~400ms ahead of playback (at synth_render time) float synth_get_output_peak(); -- cgit v1.2.3