+ 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();
+
+ virtual ~AnalogSnapshot();
+
+ void append_interleaved_samples(const float *data,
+ size_t sample_count, size_t stride);
+
+ 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();