# HG changeset patch
# User Hasan Yavuz ÖZDERYA <hy@ozderya.net>
# Date 2018-07-08 05:50:12
# Node ID cd99f9b81da202b9910a9eb7ebe32f18bbef1142
# Parent  e14b76864ac2d07ec21e8b639963db798d9c6921

preliminary implementation of gain and offset

diff --git a/src/channelinfomodel.cpp b/src/channelinfomodel.cpp
--- a/src/channelinfomodel.cpp
+++ b/src/channelinfomodel.cpp
@@ -118,6 +118,26 @@ bool ChannelInfoModel::isVisible(unsigne
     return infos[i].visibility;
 }
 
+bool ChannelInfoModel::gainEn (unsigned i) const
+{
+    return infos[i].gainEn;
+}
+
+double ChannelInfoModel::gain (unsigned i) const
+{
+    return infos[i].gain;
+}
+
+bool ChannelInfoModel::offsetEn (unsigned i) const
+{
+    return infos[i].offsetEn;
+}
+
+double ChannelInfoModel::offset (unsigned i) const
+{
+    return infos[i].offset;
+}
+
 QStringList ChannelInfoModel::channelNames() const
 {
     QStringList r;
diff --git a/src/channelinfomodel.h b/src/channelinfomodel.h
--- a/src/channelinfomodel.h
+++ b/src/channelinfomodel.h
@@ -46,6 +46,10 @@ public:
     QString name     (unsigned i) const;
     QColor  color    (unsigned i) const;
     bool    isVisible(unsigned i) const;
+    bool    gainEn   (unsigned i) const;
+    double  gain     (unsigned i) const;
+    bool    offsetEn (unsigned i) const;
+    double  offset   (unsigned i) const;
     /// Returns a list of channel names
     QStringList channelNames() const;
 
diff --git a/src/stream.cpp b/src/stream.cpp
--- a/src/stream.cpp
+++ b/src/stream.cpp
@@ -154,11 +154,25 @@ void Stream::feedIn(const SamplePack& da
     {
         static_cast<RingBuffer*>(xData)->addSamples(data.xData(), ns);
     }
-    for (unsigned i = 0; i < numChannels(); i++)
+    for (unsigned ci = 0; ci < numChannels(); ci++)
     {
-        static_cast<RingBuffer*>(channels[i]->yData())->addSamples(data.data(i), ns);
+        // TODO: check for gainEn and offsetEn
+        // apply gain and offset
+        auto rdata = data.data(ci);
+        auto mdata = new double[sizeof(double) * ns];
+        // TODO: add gain&offset access methods to `StreamChannel`
+        double gain = channels[ci]->info()->gain(ci);
+        double offset = channels[ci]->info()->offset(ci);
+        for (int i = 0; i < ns; i++)
+        {
+            mdata[i] = rdata[i] * gain + offset;
+        }
+
+        static_cast<RingBuffer*>(channels[ci]->yData())->addSamples(mdata, ns);
+        delete[] mdata;
     }
 
+    // TODO: emit modified (gain&offset) data
     Sink::feedIn(data);
 
     emit dataAdded();