pv/data/analogsegment.hpp

   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::enable_shared_from_this;
  31 using std::pair;
  32
  33 namespace AnalogSegmentTest {
  34 struct Basic;
  35 }
  36
  37 namespace pv {
  38 namespace data {
  39
  40 class Analog;
  41
  42 class AnalogSegment : public Segment, public enable_shared_from_this<Segment>
  43 {
  44         Q_OBJECT
  45
  46 public:
  47         struct EnvelopeSample
  48         {
  49                 float min;
  50                 float max;
  51         };
  52
  53         struct EnvelopeSection
  54         {
  55                 uint64_t start;
  56                 unsigned int scale;
  57                 uint64_t length;
  58                 EnvelopeSample *samples;
  59         };
  60
  61 private:
  62         struct Envelope
  63         {
  64                 uint64_t length;
  65                 uint64_t data_length;
  66                 EnvelopeSample *samples;
  67         };
  68
  69 private:
  70         static const unsigned int ScaleStepCount = 10;
  71         static const int EnvelopeScalePower;
  72         static const int EnvelopeScaleFactor;
  73         static const float LogEnvelopeScaleFactor;
  74         static const uint64_t EnvelopeDataUnit;
  75
  76 public:
  77         AnalogSegment(Analog& owner, uint32_t segment_id, uint64_t samplerate);
  78
  79         virtual ~AnalogSegment();
  80
  81         void append_interleaved_samples(const float *data,
  82                 size_t sample_count, size_t stride);
  83
  84         void get_samples(int64_t start_sample, int64_t end_sample, float* dest) const;
  85
  86         const pair<float, float> get_min_max() const;
  87
  88         float* get_iterator_value_ptr(SegmentDataIterator* it);
  89
  90         void get_envelope_section(EnvelopeSection &s,
  91                 uint64_t start, uint64_t end, float min_length) const;
  92
  93 private:
  94         void reallocate_envelope(Envelope &e);
  95
  96         void append_payload_to_envelope_levels();
  97
  98 private:
  99         Analog& owner_;
 100
 101         struct Envelope envelope_levels_[ScaleStepCount];
 102
 103         float min_value_, max_value_;
 104
 105         friend struct AnalogSegmentTest::Basic;
 106 };
 107
 108 } // namespace data
 109 } // namespace pv
 110
 111 #endif // PULSEVIEW_PV_DATA_ANALOGSEGMENT_HPP