analogsegment.hpp

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/*
 * This file is part of the PulseView project.
 *
 * Copyright (C) 2012 Joel Holdsworth <joel@airwebreathe.org.uk>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 */

#ifndef PULSEVIEW_PV_DATA_ANALOGSEGMENT_HPP
#define PULSEVIEW_PV_DATA_ANALOGSEGMENT_HPP

#include "segment.hpp"

#include <utility>
#include <vector>

namespace AnalogSegmentTest {
struct Basic;
}

namespace pv {
namespace data {

class AnalogSegment : public Segment
{
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:
    AnalogSegment(uint64_t samplerate, uint64_t expected_num_samples = 0);

    virtual ~AnalogSegment();

    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();

private:
    struct Envelope envelope_levels_[ScaleStepCount];

    friend struct AnalogSegmentTest::Basic;
};

} // namespace data
} // namespace pv

#endif // PULSEVIEW_PV_DATA_ANALOGSEGMENT_HPP