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// This file is part of the 64k demo project.
// It tests the core functionality of the audio synthesis engine.
// Verifies voice triggering, registration, and rendering state.
#include "audio/synth.h"
#include <assert.h>
#include <cmath>
#include <stdio.h>
void test_registration() {
synth_init();
float data[DCT_SIZE * 2] = {0};
Spectrogram spec = {data, data, 2};
int id = synth_register_spectrogram(&spec);
assert(id >= 0);
assert(synth_get_active_voice_count() == 0);
synth_unregister_spectrogram(id);
// Re-register to check slot reuse
int id2 = synth_register_spectrogram(&spec);
assert(id2 == id); // Should reuse the slot 0
}
void test_trigger() {
synth_init();
float data[DCT_SIZE * 2] = {0};
Spectrogram spec = {data, data, 2};
int id = synth_register_spectrogram(&spec);
synth_trigger_voice(id, 1.0f, 0.0f);
assert(synth_get_active_voice_count() == 1);
}
void test_render() {
synth_init();
float data[DCT_SIZE * 2] = {0};
// Put some signal in (DC component)
data[0] = 100.0f;
Spectrogram spec = {data, data, 2};
int id = synth_register_spectrogram(&spec);
synth_trigger_voice(id, 1.0f, 0.0f);
float output[1024] = {0};
synth_render(output, 256);
// Verify output is not all zero (IDCT of DC component should be constant)
bool non_zero = false;
for (int i = 0; i < 256; ++i) {
if (std::abs(output[i]) > 1e-6f)
non_zero = true;
}
assert(non_zero);
// Test render with no voices
synth_init(); // Reset
float output2[1024] = {0};
synth_render(output2, 256);
for (int i = 0; i < 256; ++i)
assert(output2[i] == 0.0f);
}
void test_update() {
synth_init();
float data[DCT_SIZE * 2] = {0};
Spectrogram spec = {data, data, 2};
int id = synth_register_spectrogram(&spec);
float* back_buf = synth_begin_update(id);
assert(back_buf != nullptr);
// Write something
back_buf[0] = 50.0f;
synth_commit_update(id);
// Test invalid ID
assert(synth_begin_update(-1) == nullptr);
synth_commit_update(-1); // Should not crash
}
void test_exhaustion() {
synth_init();
float data[DCT_SIZE * 2] = {0};
Spectrogram spec = {data, data, 2};
for (int i = 0; i < MAX_SPECTROGRAMS; ++i) {
int id = synth_register_spectrogram(&spec);
assert(id >= 0);
}
// Next one should fail
int id = synth_register_spectrogram(&spec);
assert(id == -1);
}
void test_peak() {
// Already called render in test_render.
// Just call the getter.
float peak = synth_get_output_peak();
assert(peak >= 0.0f);
}
int main() {
printf("Running SynthEngine tests...\n");
test_registration();
test_trigger();
test_render();
test_update();
test_exhaustion();
test_peak();
printf("SynthEngine tests PASSED\n");
return 0;
}
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