Build now compiles. audio.cpp on top of upstream's state_mgr-based
audio_loop adds three additive pieces:
1. VU peak meters for ch0/1 (spk_max) and ch2/3 (hap_max) tracked
per-sample in the existing loop; written back to g_peak_spk /
g_peak_hap after. Accessors decay 12.5% per read so the OLED
VU bars fall back naturally over a few frames.
2. Monotonic byte-flow counters: g_usb_frames++ after tud_audio_read
(the OLED Diagnostics screen + web emulator compute USB-aud/s
and BT-0x32/s as delta over time). g_bt_packets++ after each
0x36 bt_write.
3. Audio Auto Haptics DSP — 1-pole LP + envelope follower +
modulation + soft-clip per loteran/DS5Dongle 5d6bc2f, with our
added 4th "Fallback" mode that fires only after the game's
native haptic path has been silent for ~1 s (NATIVE_SILENT_TIMEOUT
= 100 audio_loop calls). Preserves native HD haptics (Spider-Man
Remastered) while filling in for games that send no haptic data
(Ghost of Tsushima). Modes: 0=Off, 1=Fallback (default), 2=Mix,
3=Replace.
Crucially the state_mgr-based state_set(pkt+13, 63) call is left
untouched — that's upstream's correct replacement for our prior
state_data restore hack, and it's load-bearing for speaker output.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
