gaindb node

nodes/gaindb/main.cpp

@@ -0,0 +1,58 @@
+#include <string>
+#include "NodeBase.hpp"
+#include "FlowDef.hpp"
+#include <mxl/flow.h>
+#include <mxl/time.h>
+
+namespace dmf {
+class GainDbNode: public dmf::NodeBase {
+    void run() override {
+        if (!config().contains("audio_in_flow_id") || !config().contains("audio_out_flow_id")) {
+            log("no audio connected to in or out");
+            return;
+        }
+        const std::string in_flow_id = config().at("audio_in_flow_id").at("id").get<std::string>();
+        dmf::AudioFlowInfo in_flow_info = dmf::read_audio_flow_info(domain(), in_flow_id);
+        int gain = 0;
+        if (config().contains("gain")) {
+            gain = config().at("gain").get<int>(); 
+        }
+        // create writer
+        int sample_rate = in_flow_info.sample_rate;
+        const std::string out_flow_id = config().at("audio_out_flow_id").at("id").get<std::string>();
+        std::string flow_def = dmf::make_audio_flow_def(
+            out_flow_id,
+            node_id(),
+            sample_rate,
+            in_flow_info.channels,
+            32,
+            sample_rate,
+            in_flow_info.samples_per_grain
+        );
+        mxlFlowWriter writer{};
+        mxlFlowConfigInfo cfg{};
+        bool created = false;
+        mxlStatus st = mxlCreateFlowWriter(instance(), flow_def.c_str(), nullptr, &writer, &cfg, &created);
+        if (st != MXL_STATUS_OK) {
+            log("audio mxlCreateFlowWriter failed (%s) — continuing without audio", dmf::mxl_status_str(st));
+        } else {
+            log("audio channels=%u  buffer=%u samples",
+                cfg.continuous.channelCount, cfg.continuous.bufferLength);
+        }
+
+        const mxlRational rate = {sample_rate, 1};
+        uint64_t index = mxlGetCurrentIndex(&rate);
+        while (dmf::g_running.load(std::memory_order_relaxed)) {
+            mxlMutableBufferSlice slice{};
+            uint8_t* buf = nullptr;
+
+        }
+        mxlReleaseFlowWriter(instance(), writer);
+    }        
+};
+}
+
+int main() {
+    dmf::GainDbNode node;
+    return node.execute();
+}