X-Git-Url: https://sigrok.org/gitweb/?p=pulseview.git;a=blobdiff_plain;f=pv%2Fdata%2Fanalogsnapshot.h;h=59c43187788e4c231dc85d652f0cb849ed5f7a91;hp=9ca08f1e510d3d564bd5367c180a336edc2ae630;hb=340bc0a429a529af5348a7aaeff455ee258a86a6;hpb=1b1ec774978b65209ce2b454cbf81da499b797d2

diff --git a/pv/data/analogsnapshot.h b/pv/data/analogsnapshot.h
index 9ca08f1e..59c43187 100644
--- a/pv/data/analogsnapshot.h
+++ b/pv/data/analogsnapshot.h
@@ -26,17 +26,55 @@
 #include <utility>
 #include <vector>
 
+namespace AnalogSnapshotTest {
+class Basic;
+}
+
 namespace pv {
 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() const;
+	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];
+
+	friend class AnalogSnapshotTest::Basic;
 };
 
 } // namespace data