Mercurial > hg > svcore
view data/fileio/AudioFileSizeEstimator.h @ 1345:c0cdacc47f4e 3.0-integration
Add filename encoding tests
author | Chris Cannam |
---|---|
date | Fri, 06 Jan 2017 12:11:08 +0000 |
parents | c380e56c95f5 |
children |
line wrap: on
line source
/* -*- 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 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 AUDIO_FILE_SIZE_ESTIMATOR_H #define AUDIO_FILE_SIZE_ESTIMATOR_H #include "base/BaseTypes.h" #include "data/fileio/FileSource.h" /** * Estimate the number of samples in an audio file. For many * compressed files this returns only a very approximate estimate, * based on a rough estimate of compression ratio. Initially we're * only aiming for a conservative estimate for purposes like "will * this file fit in memory?" (and if unsure, say no). */ class AudioFileSizeEstimator { public: /** * Return an estimate of the number of samples (across all * channels) in the given audio file, once it has been decoded and * (if applicable) resampled to the given rate. * * This function is intended to be reasonably fast -- it may open * the file, but it should not do any decoding. (However, if the * file source is remote, it will probably be downloaded in its * entirety before anything can be estimated.) * * The returned value is an estimate, and is deliberately usually * on the high side. If the estimator has no idea at all, this * will return 0. */ static sv_frame_t estimate(FileSource source, sv_samplerate_t targetRate = 0); }; #endif