From 450300013cdcc34570365832b31024959e19b107 Mon Sep 17 00:00:00 2001
From: "Matthias P. Braendli" <matthias.braendli@mpb.li>
Date: Fri, 25 Apr 2014 11:34:46 +0200
Subject: Add peak audio levels to statistics

---
 src/StatsServer.cpp | 28 ++++++++++++++++++++++++++++
 src/StatsServer.h   | 14 ++++++++++++--
 src/dabInputZmq.cpp |  3 +++
 3 files changed, 43 insertions(+), 2 deletions(-)

diff --git a/src/StatsServer.cpp b/src/StatsServer.cpp
index 2e89134..be40920 100644
--- a/src/StatsServer.cpp
+++ b/src/StatsServer.cpp
@@ -28,6 +28,7 @@
 
 #include <errno.h>
 #include <string.h>
+#include <math.h>
 #include <sstream>
 #include "StatsServer.h"
 #include "Log.h"
@@ -69,6 +70,27 @@ void StatsServer::notifyBuffer(std::string id, long bufsize)
     }
 }
 
+void StatsServer::notifyPeakLevels(std::string id, int peak_left, int peak_right)
+{
+    boost::mutex::scoped_lock lock(m_mutex);
+
+    if (m_inputStats.count(id) == 0) {
+        etiLog.level(error) <<
+            "Stats Server id '" <<
+            id << "' does was not registered";
+        return;
+    }
+
+    InputStat& is = m_inputStats[id];
+    if (peak_left > is.peak_left) {
+        is.peak_left = peak_left;
+    }
+
+    if (peak_right > is.peak_right) {
+        is.peak_right = peak_right;
+    }
+}
+
 void StatsServer::notifyUnderrun(std::string id)
 {
     boost::mutex::scoped_lock lock(m_mutex);
@@ -252,10 +274,16 @@ std::string InputStat::encodeJSON()
 {
     std::ostringstream ss;
 
+    /* convert to dB */
+    int dB_l = peak_left  ? round(20*log10((double)peak_left / INT16_MAX))  : -90;
+    int dB_r = peak_right ? round(20*log10((double)peak_right / INT16_MAX)) : -90;
+
     ss <<
     "{ \"inputstat\" : {"
         "\"min_fill\": " << min_fill_buffer << ", "
         "\"max_fill\": " << max_fill_buffer << ", "
+        "\"peak_left\": " << dB_l << ", "
+        "\"peak_right\": " << dB_r << ", "
         "\"num_underruns\": " << num_underruns << ", "
         "\"num_overruns\": " << num_overruns <<
     " } }";
diff --git a/src/StatsServer.h b/src/StatsServer.h
index 9510520..9eb08df 100644
--- a/src/StatsServer.h
+++ b/src/StatsServer.h
@@ -65,6 +65,10 @@ struct InputStat
     long num_underruns;
     long num_overruns;
 
+    // peak audio levels (linear 16-bit PCM) for the two channels
+    int peak_left;
+    int peak_right;
+
     void reset()
     {
         min_fill_buffer = MIN_FILL_BUFFER_UNDEF;
@@ -72,6 +76,9 @@ struct InputStat
 
         num_underruns = 0;
         num_overruns = 0;
+
+        peak_left = 0;
+        peak_right = 0;
     }
 
     std::string encodeJSON();
@@ -99,9 +106,12 @@ class StatsServer
         }
 
         void registerInput(std::string id);
-        // The input notifies the StatsServer about a new buffer size
-        void notifyBuffer(std::string id, long bufsize);
 
+        /* The following notify functions are used by the input to
+         * inform the StatsServer about new values
+         */
+        void notifyBuffer(std::string id, long bufsize);
+        void notifyPeakLevels(std::string id, int peak_left, int peak_right);
         void notifyUnderrun(std::string id);
         void notifyOverrun(std::string id);
 
diff --git a/src/dabInputZmq.cpp b/src/dabInputZmq.cpp
index 2a18588..1b45960 100644
--- a/src/dabInputZmq.cpp
+++ b/src/dabInputZmq.cpp
@@ -425,6 +425,9 @@ int DabInputZmqAAC::readFromSocket(size_t framesize)
             frame->encoder == ZMQ_ENCODER_FDK) {
         datalen = frame->datasize;
         data = ZMQ_FRAME_DATA(frame);
+
+        global_stats->notifyPeakLevels(m_name, frame->audiolevel_left,
+                frame->audiolevel_right);
     }
 
 
-- 
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