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1dade0bfcfae0e3a6615949e213c4d6fbf29598b
reasampler/tests/test_live_delivery.cpp
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// Standalone tests for LIVE PARAMETER DELIVERY into a sounding voice — no VST3, no REAPER, no
// framework. The block's own publication contract is live_params_tests; this file asserts what
// reaches the audio: the mid-stage rule holds normalized position, a level move glides, a
// filter knob moves the note that is already playing, two snapshots sharing one block behave
// identically (the drain slot), what stays latched at note-on stays latched, and an unmoved
// block renders byte-identically to the engine with no block at all.
#include "../src/core/instrument/engine/voice_engine.h"
#include <algorithm>
#include <cmath>
#include <cstdio>
#include <vector>
using namespace reasampler;
using instrument::engine::LiveParams;
using instrument::engine::LiveValues;
using instrument::engine::foldLive;
namespace flt = reasampler::instrument::engine::filter;
static int g_fail = 0;
#define CHECK(cond) do { if(!(cond)) { \
std::printf("FAIL line %d: %s\n", __LINE__, #cond); ++g_fail; } } while(0)
constexpr double kPi = 3.14159265358979323846;
constexpr int kRate = 48000;
static SampleData periodicSine(std::size_t frames, double period) {
SampleData s;
s.frames.resize(frames);
for (std::size_t i = 0; i < frames; ++i) {
s.frames[i] = static_cast<float>(std::sin(2.0 * kPi * static_cast<double>(i) / period));
}
s.sampleRate = kRate;
s.rootNote = 60;
// Amp held wide open so a rendered frame is the (filtered) source, undisturbed by the
// envelope under test elsewhere in this file.
s.play.adsr.sustainLevel = 1.0;
return s;
}
static double maxAbsDelta(const std::vector<AudioSample>& v, std::size_t from, std::size_t to) {
double worst = 0.0;
for (std::size_t i = from + 1; i < to && i < v.size(); ++i) {
const double d = std::fabs(static_cast<double>(v[i]) - static_cast<double>(v[i - 1]));
if (d > worst) worst = d;
}
return worst;
}
// --- The mid-stage rule (candidate iv): hold normalized stage position ------------------
static void testStageDurationChangeHoldsPhase() {
AdsrParams p;
p.attackFrames = 1000;
p.sustainLevel = 1.0;
AdsrEnvelope unedited, edited;
unedited.configure(p);
edited.configure(p);
unedited.noteOn();
edited.noteOn();
for (int i = 0; i < 500; ++i) { unedited.tick(); edited.tick(); }
AdsrParams longer = p;
longer.attackFrames = 2000; // doubled while the voice sits halfway up the attack
edited.applyLive(longer);
// Continuity: the very next frame is UNCHANGED by the edit. Exact, not approximate —
// phi is held, and the level is a pure function of phi.
const double a = unedited.tick();
const double b = edited.tick();
CHECK(a == b);
CHECK(std::fabs(b - 0.5) < 1e-12); // and it is genuinely mid-attack, not a degenerate 0/1
// The remainder takes its share of the NEW duration: half of 2000 frames left to run.
for (int i = 0; i < 998; ++i) edited.tick();
CHECK(edited.stage() == AdsrEnvelope::Stage::Attack);
edited.tick();
CHECK(edited.stage() != AdsrEnvelope::Stage::Attack);
}
static void testShortenedStageStillLandsContinuously() {
AdsrParams p;
p.attackFrames = 1000;
p.sustainLevel = 1.0;
AdsrEnvelope env;
env.configure(p);
env.noteOn();
double last = 0.0;
for (int i = 0; i < 800; ++i) last = env.tick();
AdsrParams shorter = p;
shorter.attackFrames = 100; // now SHORTER than the frames already elapsed
env.applyLive(shorter);
const double next = env.tick();
// Recomputing from absolute elapsed (800/100) would clamp to 1.0 — a step from ~0.8. The
// phi rule keeps the level where it was and finishes the remaining 20% over 20 frames.
CHECK(std::fabs(next - last) < 2e-3);
for (int i = 0; i < 19; ++i) env.tick();
CHECK(env.stage() != AdsrEnvelope::Stage::Attack);
}
static void testSustainLevelChangeGlides() {
AdsrParams p;
p.sustainLevel = 1.0;
p.releaseFrames = 100000;
AdsrEnvelope env;
env.configure(p);
env.noteOn();
for (int i = 0; i < 50; ++i) env.tick();
CHECK(env.stage() == AdsrEnvelope::Stage::Sustain);
AdsrParams quieter = p;
quieter.sustainLevel = 0.2;
env.applyLive(quieter);
double prev = 1.0;
double worstStep = 0.0;
double v = 0.0;
for (int i = 0; i < 600; ++i) {
v = env.tick();
if (i == 0) CHECK(v == 1.0); // the first frame reproduces the pre-change level exactly
const double step = std::fabs(v - prev);
if (step > worstStep) worstStep = step;
prev = v;
}
// A raw parameter swap would step 0.8 in one frame; the glide's largest single step is a
// small fraction of that, and it terminates exactly on the new level.
CHECK(worstStep < 0.05);
CHECK(v == 0.2);
}
static void testPitchEnvelopeHoldsPhaseAndGlidesDepth() {
PitchEnvParams p;
p.enabled = true;
p.attackFrames = 0;
p.decayFrames = 1000;
p.peakSemitones = 12.0;
PitchEnvelope a, b;
a.configure(p);
b.configure(p);
a.noteOn();
b.noteOn();
for (int i = 0; i < 400; ++i) { a.tick(); b.tick(); }
b.applyLive(0, 2000, 12.0); // decay doubled mid-decay
CHECK(a.tick() == b.tick()); // phi held: the semitone offset is unchanged this frame
// A depth move is a level step, so it glides rather than jumping: the first frame after
// the edit is exactly what the unedited peer emits.
PitchEnvelope c, d;
c.configure(p);
d.configure(p);
c.noteOn();
d.noteOn();
for (int i = 0; i < 400; ++i) { c.tick(); d.tick(); }
c.applyLive(0, 1000, 0.0); // depth to zero mid-decay
CHECK(c.tick() == d.tick());
// ...and it does eventually reach the new depth rather than staying put.
for (int i = 0; i < 400; ++i) c.tick();
CHECK(c.tick() == 0.0);
}
// --- The filter DSP's glide property, finally exercised ---------------------------------
static void testCutoffMoveAcrossPrepareDoesNotStep() {
flt::FilterSettings s;
s.cutoffNorm = 0.8f;
s.resonanceNorm = 1.0f; // maximum Q: the worst case for a coefficient step
s.morphNorm = 1.0f;
flt::VoiceFilter glide, cut;
glide.prepare(s, kRate);
cut.prepare(s, kRate);
std::vector<AudioSample> a, b;
const int boundary = 2000;
for (int i = 0; i < 4000; ++i) {
if (i == boundary) {
flt::FilterSettings moved = s;
moved.cutoffNorm = 0.3f;
glide.prepare(moved, kRate); // state PRESERVED — the documented glide property
cut.prepare(moved, kRate);
cut.reset(); // the control: state cleared, as at note-on
}
const float x = static_cast<float>(std::sin(2.0 * kPi * static_cast<double>(i) / 48.0));
a.push_back(glide.process(0, x));
b.push_back(cut.process(0, x));
}
const double localMax = maxAbsDelta(a, boundary - 400, boundary - 1);
const double glideStep = std::fabs(static_cast<double>(a[boundary]) -
static_cast<double>(a[boundary - 1]));
const double cutStep = std::fabs(static_cast<double>(b[boundary]) -
static_cast<double>(b[boundary - 1]));
// Preserving state keeps the boundary frame inside the signal's own frame-to-frame range;
// clearing it does not — which is what proves this assertion discriminates rather than
// passing on any pair of numbers.
CHECK(glideStep <= localMax);
CHECK(cutStep > glideStep * 4.0);
}
// --- Delivery into a sounding voice ------------------------------------------------------
// Renders `blocks` blocks of `blockFrames` through a one-voice engine over `sample`, applying
// `mutate` to the published block after `changeAfter` blocks. Voice-major render order is the
// engine's, so a fixed block size is what makes two runs comparable.
struct Run {
std::vector<AudioSample> out;
};
// The note is an octave above the root on purpose: key-tracking scales (note - root), so a
// root-note test would leave the key-track control with nothing to move.
static Run renderWithLive(SampleData& sample, LiveParams* block, int blockFrames, int blocks,
int changeAfter, const LiveValues* changed) {
sample.live = block;
if (block) block->publish(foldLive(sample.play));
VoiceEngine engine(1, sample);
engine.noteOn(72, 100);
Run r;
for (int b = 0; b < blocks; ++b) {
if (block && changed && b == changeAfter) block->publish(*changed);
engine.render(r.out, static_cast<std::size_t>(blockFrames));
}
return r;
}
static SampleData filteredSine() {
SampleData s = periodicSine(200000, 64.0);
s.play.filter.enabled = true;
s.play.filter.settings.cutoffNorm = 0.8f;
s.play.filter.settings.resonanceNorm = 0.9f;
s.play.filter.settings.morphNorm = 1.0f;
s.play.filter.env.sustainLevel = 1.0;
return s;
}
static void testUnmovedBlockIsByteIdenticalToNoBlockAtAll() {
SampleData bare = filteredSine();
SampleData blocked = filteredSine();
LiveParams block;
const Run without = renderWithLive(bare, nullptr, 512, 20, -1, nullptr);
const Run with = renderWithLive(blocked, &block, 512, 20, -1, nullptr);
CHECK(without.out.size() == with.out.size());
bool identical = true;
for (std::size_t i = 0; i < without.out.size() && i < with.out.size(); ++i) {
if (without.out[i] != with.out[i]) { identical = false; break; }
}
// Also the migration bar: a blob saved before this change folds to exactly the values the
// build already resolved, so reopening it sounds identical rather than merely close.
CHECK(identical);
}
static void testEveryLiveFilterControlMovesTheSoundingNote() {
struct Case { const char* name; void (*mutate)(LiveValues&); };
const Case cases[] = {
{"cutoff", [](LiveValues& v) { v.filterSettings.cutoffNorm = 0.15f; }},
{"Q", [](LiveValues& v) { v.filterSettings.resonanceNorm = 0.1f; }},
{"morph", [](LiveValues& v) { v.filterSettings.morphNorm = 0.0f; }},
{"drive", [](LiveValues& v) { v.filterSettings.driveNorm = 1.0f; }},
{"mod", [](LiveValues& v) { v.filterModAmount = 1.0; }},
{"keytrack", [](LiveValues& v) { v.filterKeyTrack = 2.0; }},
};
for (const Case& c : cases) {
SampleData still = filteredSine();
SampleData moved = filteredSine();
LiveParams blockA, blockB;
LiveValues target = foldLive(moved.play);
c.mutate(target);
const Run baseline = renderWithLive(still, &blockA, 512, 24, -1, nullptr);
const Run swept = renderWithLive(moved, &blockB, 512, 24, 8, &target);
// It moved THIS note: the tail after the publish differs audibly from the untouched
// render of the same note.
double tailDiff = 0.0;
for (std::size_t i = 512 * 12; i < baseline.out.size(); ++i) {
tailDiff += std::fabs(static_cast<double>(swept.out[i]) -
static_cast<double>(baseline.out[i]));
}
if (!(tailDiff > 1.0)) std::printf(" (control: %s)\n", c.name);
CHECK(tailDiff > 1.0);
// Nothing before the publish moved (the block is observed at block boundaries only).
bool preChangeIdentical = true;
for (std::size_t i = 0; i < 512 * 8; ++i) {
if (swept.out[i] != baseline.out[i]) { preChangeIdentical = false; break; }
}
CHECK(preChangeIdentical);
// And it glided rather than stepping. Measured against the signal's OWN local scale
// frame by frame, because a resonant sweep legitimately grows the output as the corner
// passes the tone — an absolute delta bound would flag that as a click. A step shows
// up instead as one frame far outside the range its own neighbourhood was moving in.
// And it ARRIVED as a glide, not as a step. Measured as how far the swept render has
// departed from the untouched one in the first frames after the publish, against how
// far it departs once settled: a glide has barely begun to diverge, a snapped delivery
// is already all the way there.
//
// This is the assertion that discriminates. A single-frame-spike metric does NOT: the
// TPT filter preserves state across prepare(), so even an instantaneous coefficient
// jump produces no isolated output spike — measured, by defeating the ramp and
// re-running, the spike statistic was unchanged while these two numbers converged.
double immediate = 0.0;
for (std::size_t i = 512 * 8; i < 512 * 8 + 16; ++i) {
immediate = (std::max)(immediate, std::fabs(static_cast<double>(swept.out[i]) -
static_cast<double>(baseline.out[i])));
}
double settled = 0.0;
for (std::size_t i = 512 * 14; i < baseline.out.size(); ++i) {
settled = (std::max)(settled, std::fabs(static_cast<double>(swept.out[i]) -
static_cast<double>(baseline.out[i])));
}
if (!(immediate <= settled * 0.4)) std::printf(" (glide: %s %f vs %f)\n", c.name,
immediate, settled);
CHECK(immediate <= settled * 0.4);
}
}
static void testDrainSlotVoiceTracksTheSameBlock() {
// Two snapshots, one block — exactly the processor's live_/draining_ shape. A note ringing
// out of the displaced snapshot must answer the knob identically to a live one.
SampleData liveSnapshot = filteredSine();
SampleData drainSnapshot = filteredSine();
LiveParams block;
liveSnapshot.live = &block;
drainSnapshot.live = &block;
block.publish(foldLive(liveSnapshot.play));
VoiceEngine liveEngine(1, liveSnapshot);
VoiceEngine drainEngine(1, drainSnapshot);
liveEngine.noteOn(60, 100);
drainEngine.noteOn(60, 100);
std::vector<AudioSample> a, b;
LiveValues moved = foldLive(liveSnapshot.play);
moved.filterSettings.cutoffNorm = 0.2f;
for (int blk = 0; blk < 24; ++blk) {
if (blk == 8) block.publish(moved);
liveEngine.render(a, 512);
drainEngine.render(b, 512);
}
CHECK(a.size() == b.size());
bool same = true;
for (std::size_t i = 0; i < a.size() && i < b.size(); ++i) {
if (a[i] != b[i]) { same = false; break; }
}
CHECK(same);
// Non-tautological: the shared block genuinely moved the sound, so "identical" is a claim
// about the drain tracking, not about nothing having happened.
double moveEnergy = 0.0;
for (std::size_t i = 512 * 12; i < a.size(); ++i) moveEnergy += std::fabs(a[i]);
CHECK(moveEnergy > 1.0);
}
// --- What stays latched at note-on -------------------------------------------------------
static void testVelocityNoteAndPitchStayLatched() {
// A ramp source read under Varispeed: every output frame is (source at readPos) * velocity
// gain, so a moved pitch ratio or a moved velocity gain would show up directly.
SampleData s;
s.frames.resize(100000);
for (std::size_t i = 0; i < s.frames.size(); ++i) {
s.frames[i] = static_cast<float>(static_cast<double>(i) / 100000.0);
}
s.sampleRate = kRate;
s.rootNote = 60;
s.velocityCurve = VelocityCurve::linear();
s.play.adsr.sustainLevel = 1.0;
LiveParams block;
s.live = &block;
block.publish(foldLive(s.play));
VoiceEngine engine(1, s);
engine.noteOn(72, 64); // an octave up: ratio 2.0
std::vector<AudioSample> out;
LiveValues hostile = foldLive(s.play);
// Everything the block CAN carry, moved as far as it goes. None of it names velocity, the
// note, the pitch ratio, or the PCM — that is the property under test.
hostile.filterKeyTrack = 2.0;
hostile.filterSettings.cutoffNorm = 0.0f;
hostile.filterModAmount = 1.0;
hostile.pitchEnvAttackFrames = 4800;
hostile.pitchEnvDecayFrames = 4800;
hostile.pitchEnvPeakSemitones = 24.0;
hostile.adsr.attackFrames = 96000; // a timed stage the voice is already past
for (int blk = 0; blk < 8; ++blk) {
if (blk == 2) block.publish(hostile);
engine.render(out, 512);
}
const double velocityGain = s.velocityCurve.eval(64.0);
bool pitchAndGainHeld = true;
for (std::size_t i = 0; i < out.size(); ++i) {
const double expected =
(static_cast<double>(2 * i) / 100000.0) * velocityGain; // ratio 2.0, latched gain
if (std::fabs(static_cast<double>(out[i]) - expected) > 1e-6) {
pitchAndGainHeld = false;
break;
}
}
CHECK(pitchAndGainHeld);
// Positive control on the same rig: a field that IS live does change the output, so the
// assertion above is not simply proving the block was ignored wholesale.
SampleData s2 = s;
LiveParams block2;
s2.live = &block2;
block2.publish(foldLive(s2.play));
VoiceEngine engine2(1, s2);
engine2.noteOn(72, 64);
std::vector<AudioSample> out2;
LiveValues quieter = foldLive(s2.play);
quieter.adsr.sustainLevel = 0.25;
for (int blk = 0; blk < 8; ++blk) {
if (blk == 2) block2.publish(quieter);
engine2.render(out2, 512);
}
CHECK(std::fabs(static_cast<double>(out2.back()) - static_cast<double>(out.back())) > 1e-4);
}
int main() {
testStageDurationChangeHoldsPhase();
testShortenedStageStillLandsContinuously();
testSustainLevelChangeGlides();
testPitchEnvelopeHoldsPhaseAndGlidesDepth();
testCutoffMoveAcrossPrepareDoesNotStep();
testUnmovedBlockIsByteIdenticalToNoBlockAtAll();
testEveryLiveFilterControlMovesTheSoundingNote();
testDrainSlotVoiceTracksTheSameBlock();
testVelocityNoteAndPitchStayLatched();
if (g_fail == 0) std::printf("live_delivery tests passed\n");
return g_fail == 0 ? 0 : 1;
}
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