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-rw-r--r--src/tests/test_audio_gen.cc97
-rw-r--r--src/tests/test_dct.cc43
-rw-r--r--src/tests/test_synth.cc78
3 files changed, 217 insertions, 1 deletions
diff --git a/src/tests/test_audio_gen.cc b/src/tests/test_audio_gen.cc
new file mode 100644
index 0000000..2877fc4
--- /dev/null
+++ b/src/tests/test_audio_gen.cc
@@ -0,0 +1,97 @@
+// This file is part of the 64k demo project.
+// It tests the procedural audio generation functions.
+
+#include "audio/gen.h"
+#include "audio/dct.h"
+#include <vector>
+#include <cassert>
+#include <iostream>
+#include <cmath>
+
+void test_generate_note() {
+ NoteParams params;
+ params.base_freq = 440.0f;
+ params.duration_sec = 0.1f; // ~3 frames
+ params.amplitude = 0.5f;
+ params.attack_sec = 0.01f;
+ params.decay_sec = 0.0f;
+ params.vibrato_rate = 0.0f;
+ params.vibrato_depth = 0.0f;
+ params.num_harmonics = 1;
+ params.harmonic_decay = 1.0f;
+ params.pitch_randomness = 0.0f;
+ params.amp_randomness = 0.0f;
+
+ int num_frames = 0;
+ std::vector<float> data = generate_note_spectrogram(params, &num_frames);
+
+ assert(num_frames > 0);
+ assert(data.size() == (size_t)num_frames * DCT_SIZE);
+
+ // Check if data is not all zero
+ bool non_zero = false;
+ for (float v : data) {
+ if (std::abs(v) > 1e-6f) {
+ non_zero = true;
+ break;
+ }
+ }
+ assert(non_zero);
+}
+
+void test_paste() {
+ std::vector<float> dest;
+ int dest_frames = 0;
+ std::vector<float> src(DCT_SIZE * 2, 1.0f); // 2 frames of 1.0s
+
+ paste_spectrogram(dest, &dest_frames, src, 2, 0);
+ assert(dest_frames == 2);
+ assert(dest.size() == 2 * DCT_SIZE);
+ assert(dest[0] == 1.0f);
+
+ // Paste with offset
+ paste_spectrogram(dest, &dest_frames, src, 2, 1);
+ // Dest was 2 frames. We paste 2 frames at offset 1.
+ // Result should be 1 + 2 = 3 frames.
+ assert(dest_frames == 3);
+ assert(dest.size() == 3 * DCT_SIZE);
+ // Overlap at frame 1: 1.0 + 1.0 = 2.0
+ assert(dest[DCT_SIZE] == 2.0f);
+ // Frame 2: 0.0 (original) + 1.0 (new) = 1.0
+ assert(dest[2 * DCT_SIZE] == 1.0f);
+}
+
+void test_filters() {
+ int num_frames = 1;
+ std::vector<float> data(DCT_SIZE, 1.0f);
+
+ // Lowpass
+ apply_spectral_lowpass(data, num_frames, 0.5f);
+ // Bins >= 256 should be 0
+ assert(data[0] == 1.0f);
+ assert(data[DCT_SIZE - 1] == 0.0f);
+ assert(data[256] == 0.0f);
+ assert(data[255] == 1.0f); // Boundary check
+
+ // Comb
+ data.assign(DCT_SIZE, 1.0f);
+ apply_spectral_comb(data, num_frames, 10.0f, 1.0f);
+ // Just check modification
+ assert(data[0] != 1.0f || data[1] != 1.0f); // It should change values
+
+ // Noise
+ data.assign(DCT_SIZE, 1.0f);
+ srand(42);
+ apply_spectral_noise(data, num_frames, 0.5f);
+ // Should be noisy
+ assert(data[0] != 1.0f);
+}
+
+int main() {
+ std::cout << "Running Audio Gen tests..." << std::endl;
+ test_generate_note();
+ test_paste();
+ test_filters();
+ std::cout << "Audio Gen tests PASSED" << std::endl;
+ return 0;
+}
diff --git a/src/tests/test_dct.cc b/src/tests/test_dct.cc
new file mode 100644
index 0000000..b40f392
--- /dev/null
+++ b/src/tests/test_dct.cc
@@ -0,0 +1,43 @@
+// This file is part of the 64k demo project.
+// It tests the DCT implementation for correctness and coverage.
+
+#include "audio/dct.h"
+#include <vector>
+#include <cmath>
+#include <cassert>
+#include <iostream>
+#include <cstdlib>
+
+void test_fdct_idct() {
+ float input[DCT_SIZE];
+ float freq[DCT_SIZE];
+ float output[DCT_SIZE];
+
+ // Initialize with random data
+ srand(12345); // Fixed seed for reproducibility
+ for (int i = 0; i < DCT_SIZE; ++i) {
+ input[i] = (float)rand() / RAND_MAX * 2.0f - 1.0f;
+ }
+
+ fdct_512(input, freq);
+ idct_512(freq, output);
+
+ // Verify reconstruction
+ float max_error = 0.0f;
+ for (int i = 0; i < DCT_SIZE; ++i) {
+ float err = std::abs(input[i] - output[i]);
+ if (err > max_error) max_error = err;
+ }
+ std::cout << "Max reconstruction error: " << max_error << std::endl;
+
+ // Allow some error due to float precision and iterative sum
+ // 512 sums can accumulate error.
+ assert(max_error < 1e-4f);
+}
+
+int main() {
+ std::cout << "Running DCT tests..." << std::endl;
+ test_fdct_idct();
+ std::cout << "DCT tests PASSED" << std::endl;
+ return 0;
+}
diff --git a/src/tests/test_synth.cc b/src/tests/test_synth.cc
index 2594660..c172da1 100644
--- a/src/tests/test_synth.cc
+++ b/src/tests/test_synth.cc
@@ -5,6 +5,7 @@
#include "audio/synth.h"
#include <assert.h>
#include <stdio.h>
+#include <cmath>
void test_registration() {
synth_init();
@@ -14,6 +15,11 @@ void test_registration() {
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() {
@@ -26,10 +32,80 @@ void test_trigger() {
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;
-}
+} \ No newline at end of file
generated by cgit v1.2.3 (git 2.51.0) at 2026-02-05 09:23:24 +0000