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Audio Phase 2 (AUDIO_FIDELITY F1/F2/F13/F14): full-zone soundbank -- key-splits,

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layers, baked tuning, loop regions, release fades

Extractor rewrite (tools/sf2extract.py): every sample-bearing instrument zone
becomes a SAMPLEINFO slot -- 603 zones / 241 presets (68/115 + 94/126 multi-
zone, matching the audit exactly).  Per zone: keyRange(43), sampleModes(54),
SBK samplePitch(55) + rootKey(58) + coarse/fineTune(51/52), attenuation(48,
INVERTED SBK scale, 0.375 dB/step [T3], baked into the PCM), releaseVolEnv(38),
pan(17), shdr loop region.

F2 pitch (algebraically exact): WAV rate = round(44100 * 2^(((6000 -
rootCents) + tune)/1200)) -- EMU8000 v1 base 44100.  Cross-checks: FootFall
17300 Hz (the audit's +4.2 st), MissileLoaded low zone 88200 (-24 st),
Warnings01 8-way klaxon split w/ 3 looped zones, Death01 162 Hz extremes.

F1 zone selection: SetupPatch/PlayNote take the authored note;
attach/play only zones whose [keyLo,keyHi] contains it (detach the rest so a
rewound source can't replay a stale buffer).  Live-verified: LaserLoaded/
MissileLoaded note 36 -> low clunk zone, note 84 -> high blip zone (pitch 4);
LaserCFire plays all 3 authored layers incl the looping sustain.  Stereo-pair
zones pan via listener-relative AL_POSITION (distance model is AL_NONE).
MAX_PRESET_SAMPLES=25 (AllExplosion); fixed PRESET_isImplemented's >=5 bound.

F13 loops + releases: authored [loopStart,loopEnd] applied via
AL_SOFT_loop_points at buffer load (0 rejections; kills the latent boom-loop
on MechExplosion's 1.5% sustain slice + the ~2.4 Hz LaserBSustain wrap tick);
StopNote now honors the authored releaseVolEnv (1.1-3.9 s on ~20 looping
presets) with a dB-linear fade serviced from AudioHead::Execute; restarts
reclaim fading sources.  One-shots keep the instant stop (faithful).

Regression (40s drive+fire): stable, loop points accepted, key-splits + layers
verified in the delivery trace, chirp still dead, footfalls fire.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
arcattack
2026-07-16 11:04:34 -05:00
co-authored by Claude Opus 4.8
parent fc7f311771
commit 691e88569a
628 changed files with 1060 additions and 1088 deletions
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engine/MUNGA/AUDIO.cpp
+15
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@@ -158,6 +158,21 @@ void
if (getenv("BT_AUDIO_SPATIAL")) { static long s_hx=0; if ((++s_hx % 300)==0)
DEBUG_STREAM << "[audioclock] frame=" << audioFrameCount << " execs=" << s_hx << "\n" << std::flush; }
// (task #50, AUDIO_FIDELITY F13) service the authored release fades
// registered by PatchLevelOfDetail::StopNote (dB-linear note-off ramps).
{
extern void PRESET_serviceReleaseFades(float elapsed_seconds);
static long s_lastFadeTicks = 0;
long now_ticks = Now().ticks;
if (s_lastFadeTicks != 0 && now_ticks > s_lastFadeTicks)
{
double tps = (double)SystemClock::GetTicksPerSecond();
if (tps <= 0.0) tps = 1000.0;
PRESET_serviceReleaseFades((float)((now_ticks - s_lastFadeTicks) / tps));
}
s_lastFadeTicks = now_ticks;
}
//set current listener orientation
Vector3D headVelocity;