Mercurial > hg > svcore
view data/model/RangeSummarisableTimeValueModel.h @ 335:02d2ad95ea52 spectrogram-cache-rejig
* Get storage advice for each cache in an FFT data server. Allows us to be
more confident about the actual memory situation and cut over from memory
to disc part way through an FFT calculation if necessary. StorageAdviser
is now a bit too optimistic though (it's too keen to allocate large numbers
of small blocks in memory).
author | Chris Cannam |
---|---|
date | Tue, 13 Nov 2007 13:54:10 +0000 |
parents | 3ff8f571da09 |
children | 700cd3350391 6f6ab834449d |
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/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */ /* Sonic Visualiser An audio file viewer and annotation editor. Centre for Digital Music, Queen Mary, University of London. This file copyright 2006-2007 Chris Cannam and QMUL. 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. See the file COPYING included with this distribution for more information. */ #ifndef _RANGE_SUMMARISABLE_TIME_VALUE_MODEL_H_ #define _RANGE_SUMMARISABLE_TIME_VALUE_MODEL_H_ #include <QObject> #include "DenseTimeValueModel.h" #include "base/ZoomConstraint.h" /** * Base class for models containing dense two-dimensional data (value * against time) that may be meaningfully represented in a zoomed view * using min/max range summaries. Audio waveform data is an obvious * example: think "peaks and minima" for "ranges". */ class RangeSummarisableTimeValueModel : public DenseTimeValueModel { Q_OBJECT public: RangeSummarisableTimeValueModel() { } struct Range { float min; float max; float absmean; Range() : min(0.f), max(0.f), absmean(0.f) { } Range(const Range &r) : min(r.min), max(r.max), absmean(r.absmean) { } Range(float min_, float max_, float absmean_) : min(min_), max(max_), absmean(absmean_) { } }; typedef std::vector<Range> RangeBlock; /** * Return ranges from the given start frame, corresponding to the * given number of underlying sample frames, summarised at the * given block size. duration / blockSize ranges should ideally * be returned. * * If the given block size is not supported by this model * (according to its zoom constraint), also modify the blockSize * parameter so as to return the block size that was actually * obtained. */ virtual void getSummaries(size_t channel, size_t start, size_t count, RangeBlock &ranges, size_t &blockSize) const = 0; /** * Return the range from the given start frame, corresponding to * the given number of underlying sample frames, summarised at a * block size equal to the distance between start and end frames. */ virtual Range getSummary(size_t channel, size_t start, size_t count) const = 0; }; #endif