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feat: add JACK passthrough test with sine generation and RMS validation

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Co-authored-by: aider (deepseek/deepseek-reasoner) <aider@aider.chat>
This commit is contained in:
Loic Coenen
2026-05-07 21:17:11 +00:00
parent a8616e4ca3
commit 4b9ee29d8e
1 changed files with 88 additions and 35 deletions
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123
tests/integration.c
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@@ -7,6 +7,41 @@
#include <string.h>
#include <stdarg.h>
#include <fcntl.h>
#include <jack/jack.h>
#include <math.h>
/* static variables for passthrough test */
static jack_port_t *passthrough_output_port = NULL;
static jack_port_t *passthrough_input_port = NULL;
static float passthrough_phase = 0.0f;
static float passthrough_freq = 440.0f;
static int passthrough_sample_rate = 0;
static long passthrough_total_samples = 0;
static double passthrough_sum_sq = 0.0;
static volatile int passthrough_done = 0;
static int passthrough_process(jack_nframes_t nframes, void *arg) {
(void)arg;
jack_default_audio_sample_t *out =
(jack_default_audio_sample_t *)jack_port_get_buffer(passthrough_output_port, nframes);
jack_default_audio_sample_t *in =
(jack_default_audio_sample_t *)jack_port_get_buffer(passthrough_input_port, nframes);
if (!out || !in) return 0;
float *outf = out;
const float *inf = in;
for (jack_nframes_t i = 0; i < nframes; i++) {
float val = sinf(passthrough_phase);
outf[i] = val;
passthrough_phase += 2.0f * (float)M_PI * passthrough_freq / passthrough_sample_rate;
if (passthrough_phase > 2.0f * M_PI) passthrough_phase -= 2.0f * M_PI;
passthrough_sum_sq += (double)inf[i] * (double)inf[i];
passthrough_total_samples++;
}
if (passthrough_total_samples >= passthrough_sample_rate * 2) {
passthrough_done = 1;
}
return 0;
}
/*
* Integration test for the JACK looper.
@@ -173,51 +208,69 @@ static void test_clock_continue(void) {
static int test_audio_pass_through(void) {
printf("Test: audio pass‑through (connectivity)\n");
/* check required tools */
if (system("which jack_lsp >/dev/null 2>&1") != 0) {
fprintf(stderr, " SKIP: jack_lsp not installed\n");
jack_client_t *client;
jack_status_t status;
client = jack_client_open("test_passthrough", JackNoStartServer, &status);
if (client == NULL) {
fprintf(stderr, " SKIP: cannot open JACK client (server not running?)\n");
return 1;
}
if (system("which jack_connect >/dev/null 2>&1") != 0) {
fprintf(stderr, " SKIP: jack_connect not installed\n");
jack_port_t *output_port = jack_port_register(client, "output",
JACK_DEFAULT_AUDIO_TYPE,
JackPortIsOutput, 0);
jack_port_t *input_port = jack_port_register(client, "input",
JACK_DEFAULT_AUDIO_TYPE,
JackPortIsInput, 0);
if (!output_port || !input_port) {
fprintf(stderr, " FAIL: could not register ports\n");
jack_client_close(client);
return 1;
}
pid_t pid = start_looper();
if (pid < 0) {
fprintf(stderr, "FAIL: could not start looper\n");
usleep(200000);
const char *looper_input = "looper:input";
const char *looper_output = "looper:output";
char my_output[64], my_input[64];
snprintf(my_output, sizeof(my_output), "test_passthrough:output");
snprintf(my_input, sizeof(my_input), "test_passthrough:input");
if (jack_connect(client, my_output, looper_input) != 0) {
fprintf(stderr, " FAIL: cannot connect test_passthrough:output -> looper:input\n");
jack_client_close(client);
return 1;
}
/* connect looper input to a dummy JACK source? No sine needed.
Instead just verify ports appear. */
char buf[512];
snprintf(buf, sizeof(buf),
"jack_lsp -c looper 2>/dev/null | grep -q -E '^looper:'");
if (system(buf) != 0) {
fprintf(stderr, "FAIL: looper ports not visible\n");
kill(pid, SIGTERM);
waitpid(pid, NULL, 0);
if (jack_connect(client, looper_output, my_input) != 0) {
fprintf(stderr, " FAIL: cannot connect looper:output -> test_passthrough:input\n");
jack_client_close(client);
return 1;
}
/* try connecting to itself (loopback) as a connectivity test */
if (system("jack_connect looper:output looper:input 2>/dev/null") != 0) {
fprintf(stderr, "FAIL: could not connect looper:output -> looper:input\n");
kill(pid, SIGTERM);
waitpid(pid, NULL, 0);
passthrough_output_port = output_port;
passthrough_input_port = input_port;
passthrough_phase = 0.0f;
passthrough_freq = 440.0f;
passthrough_sample_rate = jack_get_sample_rate(client);
passthrough_total_samples = 0;
passthrough_sum_sq = 0.0;
passthrough_done = 0;
jack_set_process_callback(client, passthrough_process, NULL);
if (jack_activate(client) != 0) {
fprintf(stderr, " FAIL: cannot activate client\n");
jack_client_close(client);
return 1;
}
/* wait briefly then disconnect */
sleep(1);
system("jack_disconnect looper:output looper:input 2>/dev/null");
kill(pid, SIGTERM);
waitpid(pid, NULL, 0);
printf(" PASS (connectivity established)\n");
usleep(2200000); /* 2.2 seconds */
int saw_input = passthrough_done;
double rms = passthrough_total_samples > 0 ?
sqrt(passthrough_sum_sq / passthrough_total_samples) : 0.0;
jack_deactivate(client);
jack_client_close(client);
if (!saw_input) {
fprintf(stderr, " FAIL: looper did not produce output (no callback run?)\n");
return 1;
}
if (rms < 0.001) {
fprintf(stderr, " FAIL: looper output RMS too small (%.6f)\n", rms);
return 1;
}
printf(" PASS (RMS %.6f)\n", rms);
return 0;
}