debug shared_buffer stream

src/SharedMemoryWriter.cpp

@@ -128,6 +128,19 @@ bool SharedMemoryWriter::writeFrame(const uint8_t* data, const size_t size,
     // 3. Copy frame data
     memcpy(frame_data, data, size);
 
+    // Debug: Log every 60 frames
+    static uint64_t debug_counter = 0;
+    if (++debug_counter % 60 == 0) {
+        std::cout << "[SHM] Frame #" << frame_counter_
+                  << " written. write_seq=" << header->write_sequence.load()
+                  << " size=" << size
+                  << " first 4 bytes: ";
+        for (int i = 0; i < 4 && i < size; i++) {
+            printf("%02x ", frame_data[i]);
+        }
+        std::cout << std::endl;
+    }
+
     // 4. Increment sequence (even = write complete)
     header->write_sequence.fetch_add(1, std::memory_order_release);