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Segments: Fix iterator access to underlying value
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1 /*
2  * This file is part of the PulseView project.
3  *
4  * Copyright (C) 2012 Joel Holdsworth <joel@airwebreathe.org.uk>
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation; either version 2 of the License, or
9  * (at your option) any later version.
10  *
11  * This program is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14  * GNU General Public License for more details.
15  *
16  * You should have received a copy of the GNU General Public License
17  * along with this program; if not, see <http://www.gnu.org/licenses/>.
18  */
19
20 #ifndef PULSEVIEW_PV_DATA_ANALOGSEGMENT_HPP
21 #define PULSEVIEW_PV_DATA_ANALOGSEGMENT_HPP
22
23 #include "segment.hpp"
24
25 #include <utility>
26 #include <vector>
27
28 #include <QObject>
29
30 using std::pair;
31
32 namespace AnalogSegmentTest {
33 struct Basic;
34 }
35
36 namespace pv {
37 namespace data {
38
39 class Analog;
40
41 class AnalogSegment : public Segment
42 {
43         Q_OBJECT
44
45 public:
46         struct EnvelopeSample
47         {
48                 float min;
49                 float max;
50         };
51
52         struct EnvelopeSection
53         {
54                 uint64_t start;
55                 unsigned int scale;
56                 uint64_t length;
57                 EnvelopeSample *samples;
58         };
59
60 private:
61         struct Envelope
62         {
63                 uint64_t length;
64                 uint64_t data_length;
65                 EnvelopeSample *samples;
66         };
67
68 private:
69         static const unsigned int ScaleStepCount = 10;
70         static const int EnvelopeScalePower;
71         static const int EnvelopeScaleFactor;
72         static const float LogEnvelopeScaleFactor;
73         static const uint64_t EnvelopeDataUnit;
74
75 public:
76         AnalogSegment(Analog& owner, uint32_t segment_id, uint64_t samplerate);
77
78         virtual ~AnalogSegment();
79
80         void append_interleaved_samples(const float *data,
81                 size_t sample_count, size_t stride);
82
83         void get_samples(int64_t start_sample, int64_t end_sample, float* dest) const;
84
85         const pair<float, float> get_min_max() const;
86
87         float* get_iterator_value_ptr(SegmentDataIterator* it);
88
89         void get_envelope_section(EnvelopeSection &s,
90                 uint64_t start, uint64_t end, float min_length) const;
91
92 private:
93         void reallocate_envelope(Envelope &e);
94
95         void append_payload_to_envelope_levels();
96
97 private:
98         Analog& owner_;
99
100         struct Envelope envelope_levels_[ScaleStepCount];
101
102         float min_value_, max_value_;
103
104         friend struct AnalogSegmentTest::Basic;
105 };
106
107 } // namespace data
108 } // namespace pv
109
110 #endif // PULSEVIEW_PV_DATA_ANALOGSEGMENT_HPP