X-Git-Url: https://sigrok.org/gitweb/?p=pulseview.git;a=blobdiff_plain;f=pv%2Fdata%2Fanalogsnapshot.h;h=74d26763825167a41c81390c08647ba0a3b03560;hp=a45391849220332b892faa9ed3eaa79df30a4df6;hb=9320072da54c5f1614779512d8c8d3bac6743419;hpb=d37583678256450d7eb646213d0b9e170a427933

diff --git a/pv/data/analogsnapshot.h b/pv/data/analogsnapshot.h
index a4539184..74d26763 100644
--- a/pv/data/analogsnapshot.h
+++ b/pv/data/analogsnapshot.h
@@ -26,18 +26,67 @@
 #include <utility>
 #include <vector>
 
+namespace AnalogSnapshotTest {
+class Basic;
+}
+
 namespace pv {
 namespace data {
 
 class AnalogSnapshot : public Snapshot
 {
+public:
+	struct EnvelopeSample
+	{
+		float min;
+		float max;
+	};
+
+	struct EnvelopeSection
+	{
+		uint64_t start;
+		unsigned int scale;
+		uint64_t length;
+		EnvelopeSample *samples;
+	};
+
+private:
+	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;
+
+	void get_envelope_section(EnvelopeSection &s,
+		uint64_t start, uint64_t end, float min_length) 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