X-Git-Url: https://sigrok.org/gitweb/?p=pulseview.git;a=blobdiff_plain;f=pv%2Fdata%2Fanalogsnapshot.h;fp=pv%2Fdata%2Fanalogsnapshot.h;h=8eec2797f1a4aa77b5945ccf31f2eef926600dce;hp=a45391849220332b892faa9ed3eaa79df30a4df6;hb=fda5b6e0e0ebbe55f3d173051b8800293f87cd09;hpb=785fd8d138e5866ade499c02ea405b8852fee113

diff --git a/pv/data/analogsnapshot.h b/pv/data/analogsnapshot.h
index a4539184..8eec2797 100644
--- a/pv/data/analogsnapshot.h
+++ b/pv/data/analogsnapshot.h
@@ -31,15 +31,44 @@ namespace data {
 
 class AnalogSnapshot : public Snapshot
 {
+private:
+	struct EnvelopeSample
+	{
+		float min;
+		float max;
+	};
+
+	struct Envelope
+	{
+		uint64_t length;
+		uint64_t data_length;
+		EnvelopeSample *samples;
+	};
+
+private:
+	static const unsigned int ScaleStepCount = 10;
+	static const int EnvelopeScalePower;
+	static const int EnvelopeScaleFactor;
+	static const float LogEnvelopeScaleFactor;
+	static const uint64_t EnvelopeDataUnit;
+
 public:
 	AnalogSnapshot(const sr_datafeed_analog &analog);
 
+	virtual ~AnalogSnapshot();
+
 	void append_payload(const sr_datafeed_analog &analog);
 
 	const float* get_samples(int64_t start_sample,
 		int64_t end_sample) const;
-};
 
+private:
+	void reallocate_envelope(Envelope &l);
+
+	void append_payload_to_envelope_levels();
+
+private:
+	struct Envelope _envelope_levels[ScaleStepCount];
 } // namespace data
 } // namespace pv