Change the conanfile

Signed-off-by: Nikolai Rodionov <allanger@badhouseplants.net>

src/main.cpp

@@ -1,9 +1,61 @@
-#include <QApplication>
-#include <QLabel>
+// src/main.cpp
+#include <jack/jack.h>
+#include <cmath>
+#include <iostream>
+#include <atomic>
 
-int main(int argc, char *argv[]) {
-    QApplication app(argc, argv);
-    QLabel label("Hello from Qt + Meson + Conan!");
-    label.show();
-    return app.exec();
+static std::atomic<jack_client_t*> g_client{nullptr};
+static float g_phase = 0.0f;
+static const float kFreq = 440.0f;
+
+int process(jack_nframes_t nframes, void* arg) {
+    jack_port_t* port = static_cast<jack_port_t*>(arg);
+    float* out = (float*)jack_port_get_buffer(port, nframes);
+    jack_client_t* client = g_client.load();
+    if (!client) return 0;
+
+    jack_nframes_t sr = jack_get_sample_rate(client);
+    for (jack_nframes_t i = 0; i < nframes; ++i) {
+        out[i] = std::sinf(g_phase);
+        g_phase += 2.0f * static_cast<float>(M_PI) * kFreq / static_cast<float>(sr);
+        if (g_phase > 2.0f * static_cast<float>(M_PI)) g_phase -= 2.0f * static_cast<float>(M_PI);
+    }
+    return 0;
+}
+
+int main() {
+    jack_status_t status;
+    jack_client_t* client = jack_client_open("cpp_jack_player", JackNullOption, &status);
+    if (!client) {
+        std::cerr << "Failed to open JACK client (status=" << status << ")\n";
+        return 1;
+    }
+    g_client.store(client);
+
+    jack_port_t* outport = jack_port_register(client, "output", JACK_DEFAULT_AUDIO_TYPE,
+                                              JackPortIsOutput, 0);
+    if (!outport) {
+        std::cerr << "Failed to register output port\n";
+        jack_client_close(client);
+        return 1;
+    }
+
+    if (jack_set_process_callback(client, process, outport) != 0) {
+        std::cerr << "Failed to set process callback\n";
+        jack_client_close(client);
+        return 1;
+    }
+
+    if (jack_activate(client) != 0) {
+        std::cerr << "Failed to activate JACK client\n";
+        jack_client_close(client);
+        return 1;
+    }
+
+    std::cout << "Client active. Connect " << jack_get_client_name(client)
+              << ":output to system:playback (e.g. with qjackctl). Press Enter to quit.\n";
+    std::cin.get();
+
+    jack_client_close(client);
+    return 0;
 }