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 namespace AnalogSegmentTest {
  29 struct Basic;
  30 }
  31
  32 namespace pv {
  33 namespace data {
  34
  35 typedef struct {
  36         uint64_t sample_index, chunk_num, chunk_offs;
  37         uint8_t* chunk;
  38         float* value;
  39 } SegmentAnalogDataIterator;
  40
  41 class AnalogSegment : public Segment
  42 {
  43 public:
  44         struct EnvelopeSample
  45         {
  46                 float min;
  47                 float max;
  48         };
  49
  50         struct EnvelopeSection
  51         {
  52                 uint64_t start;
  53                 unsigned int scale;
  54                 uint64_t length;
  55                 EnvelopeSample *samples;
  56         };
  57
  58 private:
  59         struct Envelope
  60         {
  61                 uint64_t length;
  62                 uint64_t data_length;
  63                 EnvelopeSample *samples;
  64         };
  65
  66 private:
  67         static const unsigned int ScaleStepCount = 10;
  68         static const int EnvelopeScalePower;
  69         static const int EnvelopeScaleFactor;
  70         static const float LogEnvelopeScaleFactor;
  71         static const uint64_t EnvelopeDataUnit;
  72
  73 public:
  74         AnalogSegment(uint64_t samplerate);
  75
  76         virtual ~AnalogSegment();
  77
  78         void append_interleaved_samples(const float *data,
  79                 size_t sample_count, size_t stride);
  80
  81         const float* get_samples(int64_t start_sample,
  82                 int64_t end_sample) const;
  83
  84         SegmentAnalogDataIterator* begin_sample_iteration(uint64_t start) const;
  85         void continue_sample_iteration(SegmentAnalogDataIterator* it, uint64_t increase) const;
  86         void end_sample_iteration(SegmentAnalogDataIterator* it) const;
  87
  88         void get_envelope_section(EnvelopeSection &s,
  89                 uint64_t start, uint64_t end, float min_length) const;
  90
  91 private:
  92         void reallocate_envelope(Envelope &e);
  93
  94         void append_payload_to_envelope_levels();
  95
  96 private:
  97         struct Envelope envelope_levels_[ScaleStepCount];
  98
  99         friend struct AnalogSegmentTest::Basic;
 100 };
 101
 102 } // namespace data
 103 } // namespace pv
 104
 105 #endif // PULSEVIEW_PV_DATA_ANALOGSEGMENT_HPP