Mercurial > hg > svcore
view base/AudioLevel.h @ 40:b2d1a61ab916
* A bit more work on main window / document / commands stuff. This is still
pretty unstable.
* Enable CSV file reader also to read files with other separators (e.g. .lab
files with space separators)
* Show "(R)" on waveform display when resampling during playback
* Add ability to import additional audio files (can't process them yet)
* Fixes to spectrogram cache for multiple views
* Fix to avoid floating-point exception in sparse model when resolution not
set yet
author | Chris Cannam |
---|---|
date | Mon, 06 Mar 2006 17:20:25 +0000 |
parents | 2fb933f88604 |
children | 39ae3dee27b9 |
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/* -*- c-basic-offset: 4 -*- vi:set ts=8 sts=4 sw=4: */ /* A waveform viewer and audio annotation editor. Chris Cannam, Queen Mary University of London, 2005-2006 This is experimental software. Not for distribution. */ /* This is a modified version of a source file from the Rosegarden MIDI and audio sequencer and notation editor. This file copyright 2000-2006 Chris Cannam. */ #ifndef _AUDIO_LEVEL_H_ #define _AUDIO_LEVEL_H_ /** * AudioLevel converts audio sample levels between various scales: * * - dB values (-inf -> 0dB) * - floating-point values (-1.0 -> 1.0) such as used for a * multiplier for gain or in floating-point WAV files * - integer values intended to correspond to pixels on a fader * or vu level scale. */ class AudioLevel { public: static const float DB_FLOOR; enum FaderType { ShortFader = 0, // -40 -> +6 dB LongFader = 1, // -70 -> +10 dB IEC268Meter = 2, // -70 -> 0 dB IEC268LongMeter = 3, // -70 -> +10 dB (0dB aligns with LongFader) PreviewLevel = 4 }; static float multiplier_to_dB(float multiplier); static float dB_to_multiplier(float dB); static float fader_to_dB(int level, int maxLevel, FaderType type); static int dB_to_fader(float dB, int maxFaderLevel, FaderType type); static float fader_to_multiplier(int level, int maxLevel, FaderType type); static int multiplier_to_fader(float multiplier, int maxFaderLevel, FaderType type); // fast if "levels" doesn't change often -- for audio segment previews static int multiplier_to_preview(float multiplier, int levels); static float preview_to_multiplier(int level, int levels); }; #endif