Add stats sender to UNIX datagram socket

1 files changed, 66 insertions, 0 deletions

diff --git a/src/StatsPublish.h b/src/StatsPublish.h
new file mode 100644
index 0000000..7702f66
--- /dev/null
+++ b/src/StatsPublish.h
@@ -0,0 +1,66 @@
+/* ------------------------------------------------------------------
+ * Copyright (C) 2019 Matthias P. Braendli
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
+ * express or implied.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ * -------------------------------------------------------------------
+ */
+
+#pragma once
+#include <string>
+#include <cstdint>
+#include <cstddef>
+#include <cstdio>
+#include "common.h"
+
+/*! \file StatsPublish.h
+ *
+ * Collects and sends some stats to a UNIX DGRAM socket so that an external tool
+ * like ODR-EncoderManager can display it.
+ *
+ * Currently, only audio levels are collected.
+ *
+ * Output is formatted in YAML
+ */
+class StatsPublisher {
+    public:
+        StatsPublisher(const std::string& socket_path);
+
+        /*! Update peak audio level information */
+        void update_audio_levels(int16_t audiolevel_left, int16_t audiolevel_right);
+
+        /*! Increments the underrun counter */
+        void notify_underrun();
+
+        /*! Increments the overrun counter */
+        void notify_overrun();
+
+        /*! Send the collected stats to the socket, doesn't block. If the socket is
+         * not connected, the data is lost.
+         *
+         * Clears the collected data.  */
+        void send_stats();
+
+    private:
+        std::string m_socket_path;
+        int m_sock = -1;
+
+        int16_t m_audio_left = 0;
+        int16_t m_audio_right = 0;
+
+        size_t m_num_underruns = 0;
+        size_t m_num_overruns = 0;
+
+        bool m_destination_available = true;
+};
+