[pulseview.git] / pv / data / analogsnapshot.h

/*
 * 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_ANALOGSNAPSHOT_H
#define PULSEVIEW_PV_DATA_ANALOGSNAPSHOT_H

#include "snapshot.h"

#include <utility>
#include <vector>

namespace pv {
namespace data {

class AnalogSnapshot : public Snapshot
{
private:
	struct EnvelopeSample
	{
		float min;
		float max;
	};

	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(const sr_datafeed_analog &analog);

	virtual ~AnalogSnapshot();

	void append_payload(const sr_datafeed_analog &analog);

	const float* get_samples(int64_t start_sample,
		int64_t end_sample) const;

private:
	void reallocate_envelope(Envelope &l);

	void append_payload_to_envelope_levels();

private:
	struct Envelope _envelope_levels[ScaleStepCount];
} // namespace data
} // namespace pv

#endif // PULSEVIEW_PV_DATA_ANALOGSNAPSHOT_H
Commit	Line	Data
	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, write to the Free Software
	18	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	19	*/
	20
	21	#ifndef PULSEVIEW_PV_DATA_ANALOGSNAPSHOT_H
	22	#define PULSEVIEW_PV_DATA_ANALOGSNAPSHOT_H
	23
	24	#include "snapshot.h"
	25
	26	#include <utility>
	27	#include <vector>
	28
	29	namespace pv {
	30	namespace data {
	31
	32	class AnalogSnapshot : public Snapshot
	33	{
	34	private:
	35	struct EnvelopeSample
	36	{
	37	float min;
	38	float max;
	39	};
	40
	41	struct Envelope
	42	{
	43	uint64_t length;
	44	uint64_t data_length;
	45	EnvelopeSample *samples;
	46	};
	47
	48	private:
	49	static const unsigned int ScaleStepCount = 10;
	50	static const int EnvelopeScalePower;
	51	static const int EnvelopeScaleFactor;
	52	static const float LogEnvelopeScaleFactor;
	53	static const uint64_t EnvelopeDataUnit;
	54
	55	public:
	56	AnalogSnapshot(const sr_datafeed_analog &analog);
	57
	58	virtual ~AnalogSnapshot();
	59
	60	void append_payload(const sr_datafeed_analog &analog);
	61
	62	const float* get_samples(int64_t start_sample,
	63	int64_t end_sample) const;
	64
	65	private:
	66	void reallocate_envelope(Envelope &l);
	67
	68	void append_payload_to_envelope_levels();
	69
	70	private:
	71	struct Envelope _envelope_levels[ScaleStepCount];
	72	} // namespace data
	73	} // namespace pv
	74
	75	#endif // PULSEVIEW_PV_DATA_ANALOGSNAPSHOT_H