- TestMP3Valid: synthetic snapshots through full pipeline, ffprobe validation
- TestZeroPacketError: empty slice and zero-count snapshots return error, no file created
- TestEncodeMP3DirectBytes: direct frame encoding validated by ffprobe
- Created 02-02-SUMMARY.md with plan results and 14 test descriptions
- Updated STATE.md: advanced to plan 3 of 3, recorded metrics and decisions
- Updated ROADMAP.md: phase 02 showing 2/3 summaries complete
- Marked SYNTH-03 complete in REQUIREMENTS.md
- NewBank creates 11 layers from ClassFreqConfigs, one per TrafficClass
- RenderWindow transforms WindowSnapshot into SamplesPerWindow stereo frames
- GainPerLayer (1/11) applied per layer guarantees no clipping with all layers at max
- PanGains applied per layer for constant-power stereo positioning
- EMA amplitude smoothing provides temporal convergence across windows
- 7 bank tests: layer count, output length, silence, non-zero, no-clip, stereo pan, EMA convergence
- synth/config.go: FreqConfig, HarmonicDef types; ClassFreqConfigs for all 11 traffic classes
with frequencies in 60-800 Hz using musical intervals; pan positions per D-12
- synth/oscillator.go: phase-accumulator oscillator with additive harmonic synthesis
and phase subtraction wrap (not math.Mod) per D-05
- synth/layer.go: EMA amplitude smoothing with tau-based alpha; whisper floor (0.03)
prevents silence once class has been seen; UpdateTarget/AdvanceSample interface
- All 12 tests pass (TestAllClassesHaveConfig, TestFrequenciesUnique, TestEMAAmplitudeRise, etc.)
- Add github.com/sjzar/go-lame v0.0.9 to go.mod for MP3 encoding
- gcc and ffprobe available via apt (gcc 13.3.0, ffprobe 6.1.1)
- CGO_ENABLED=1 build verified successful
- cmd/netsynth/main.go: Cobra root command with -i, --list-interfaces, --verbose flags
- Signal handling via signal.NotifyContext for clean Ctrl+C shutdown
- 3-stage pipeline: capture.StartCapture -> classify.NewClassifier -> aggregate.Aggregate
- Permission errors surface platform-specific sudo/setcap hint (CAPT-04)
- --verbose flag wires aggregate.PrintWindowLine callback for per-window output
- Exit summary via aggregate.PrintSummary with dropped packet warning
- cmd/netsynth/main_test.go: 3 tests covering flag parsing and help output
- go.mod: cobra v1.10.2 and go-pcap promoted to direct dependencies
- ListInterfaces uses net.Interfaces() stdlib (no pcap dependency for listing)
- OpenCapture wraps packetcap/go-pcap with platform-specific permission error handling
- StartCapture uses buffered channel (512) with atomic drop counter
- Dynamic link type detection via layers.LinkType(handle.LinkType())
- Linux error shows setcap cap_net_raw+ep hint; macOS shows sudo hint
- Add github.com/packetcap/go-pcap v0.0.0-20251215 to go.mod
- TestListInterfaces: verifies net.Interfaces() returns at least 1 interface
- TestListInterfacesFormat: verifies interface Name is non-empty
- TestIsPermissionError: table-driven positive cases for perm error detection
- TestIsPermissionErrorNegative: non-perm errors not flagged
- TestPermissionErrorMsg: verifies sudo + interface name + Linux setcap hint
- go mod tidy updates go.mod to reflect actual imports
- gopacket is now a direct dependency (used in classifier.go)
- go-pcap and cobra remain in go.sum for future plans
gurix
