tempo-plotter Changeset - f5271e6d0ce0 · protofusion repositories

Changeset - f5271e6d0ce0

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gain-offset

0 2 0

Hasan Yavuz ÖZDERYA - 7 years ago 2018-07-09 16:09:14
hy@ozderya.net

apply gain and offset only when enabled

2 files changed with 68 insertions and 22 deletions:

src/stream.cpp

src/stream.h

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src/stream.cpp

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@@ @@ -142,39 +142,72 @@ void Stream::setNumChannels(unsigned nc, @@
     Sink::setNumChannels(nc, x);
+}
-void Stream::feedIn(const SamplePack& data)
+const SamplePack* Stream::applyGainOffset(const SamplePack& pack) const
+{
     Q_ASSERT(data.numChannels() == numChannels() &&
              data.hasX() == hasX());
     SamplePack* mPack = nullptr;
     unsigned ns = pack.numSamples();
     for (unsigned ci = 0; ci < numChannels(); ci++)
+    {
         bool gainEn = channels[ci]->info()->gainEn(ci);
         bool offsetEn = channels[ci]->info()->offsetEn(ci);
         double* mdata;
         if (gainEn || offsetEn)
+        {
             if (mPack == nullptr)
                 mPack = new SamplePack(pack);
             mdata = mPack->data(ci);
             double gain = channels[ci]->info()->gain(ci);
             double offset = channels[ci]->info()->offset(ci);
             if (gainEn)
+            {
                 for (unsigned i = 0; i < ns; i++)
+                {
                     mdata[i] *= gain;
+                }
+            }
             if (offsetEn)
+            {
                 for (unsigned i = 0; i < ns; i++)
+                {
                     mdata[i] += offset;
+                }
+            }
+        }
+    }
     return mPack;
+}
 void Stream::feedIn(const SamplePack& pack)
+{
     Q_ASSERT(pack.numChannels() == numChannels() &&
              pack.hasX() == hasX());
     if (_paused) return;
-    unsigned ns = data.numSamples();
+    unsigned ns = pack.numSamples();
     if (_hasx)
+    {
-        static_cast<RingBuffer*>(xData)->addSamples(data.xData(), ns);
+        static_cast<RingBuffer*>(xData)->addSamples(pack.xData(), ns);
+    }
     // modified pack that gain and offset is applied to
     const SamplePack* mPack = applyGainOffset(pack);
     for (unsigned ci = 0; ci < numChannels(); ci++)
+    {
         // 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;
         auto buf = static_cast<RingBuffer*>(channels[ci]->yData());
         double* data = (mPack == nullptr) ? pack.data(ci) : mPack->data(ci);
         buf->addSamples(data, ns);
+    }
     // TODO: emit modified (gain&offset) data
     Sink::feedIn(data);
     Sink::feedIn((mPack == nullptr) ? pack : *mPack);
     if (mPack != nullptr) delete mPack;
     emit dataAdded();
+}

src/stream.h

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@@ @@ -69,7 +69,7 @@ public: @@
 protected:
     // implementations for `Sink`
     virtual void setNumChannels(unsigned nc, bool x);
-    virtual void feedIn(const SamplePack& data);
+    virtual void feedIn(const SamplePack& pack);
 signals:
     void numChannelsChanged(unsigned value);
@@ @@ -98,6 +98,19 @@ private: @@
     QList<StreamChannel*> channels;
     ChannelInfoModel _infoModel;
     /**
      * Applies gain and offset to given pack.
+     *
      * If gain or offset isn't enabled this function returns `nullptr`. If gain
      * or offset is enabled for at least 1 channel input pack is copied and
      * modified. Result is returned. Caller is responsible for deleting
      * returned `SamplePack`.
+     *
      * @param pack input data
      * @return `nullptr` if no gain or offset is enabled otherwise modified data
      */
     const SamplePack* applyGainOffset(const SamplePack& pack) const;
 };

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