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authorDavid Robillard <d@drobilla.net>2007-07-24 19:26:47 +0000
committerDavid Robillard <d@drobilla.net>2007-07-24 19:26:47 +0000
commit3b4a308ff647def75e647ac8f97e1e48b57672c3 (patch)
treea33e3a5c78f2ee7f23e151f39fe17ab39b0b81c8 /raul/TimeSlice.h
parentfcb302e6248527b2f1fb655f4d0a64af18f5f059 (diff)
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Consistently rename all C++ files .cpp/.hpp.
Fix (some) inclusion guard names to not clash with other libs. git-svn-id: http://svn.drobilla.net/lad/raul@613 a436a847-0d15-0410-975c-d299462d15a1
Diffstat (limited to 'raul/TimeSlice.h')
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diff --git a/raul/TimeSlice.h b/raul/TimeSlice.h
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-/* This file is part of Raul.
- * Copyright (C) 2007 Dave Robillard <http://drobilla.net>
- *
- * Raul 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.
- *
- * Raul 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 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 RAUL_TIMESLICE_H
-#define RAUL_TIMESLICE_H
-
-#include <cassert>
-#include <cmath>
-#include <boost/utility.hpp>
-#include <raul/types.h>
-
-namespace Raul {
-
-
-/** A duration of time, with conversion between tick time and beat time.
- *
- * This is a slice along a single timeline (ie t=0 in ticks and t=0 in beats
- * are equal). Relation to an external time base (e.g. Jack frame time) is
- * represented by frame_offset (the idea is that this holds all the information
- * necessary for passing to run() methods so they know the current state of
- * things WRT time).
- *
- * This class handles conversion between two units of time: musical
- * (beat) time, and real (tick) time. Real time is discrete, the smallest
- * unit of time is the 'tick' (usually audio frames or MIDI ticks). Beat time
- * is stored as a double (to be independent of any rates or timer precision).
- *
- * This caches as many values as possible to make calls less expensive, pass it
- * around by reference, not value.
- *
- * \ingroup raul
- */
-class TimeSlice : public boost::noncopyable {
-public:
- TimeSlice(double tick_rate, double bpm)
- : _tick_rate(tick_rate)
- , _beat_rate(60.0/bpm)
- , _start_ticks(0)
- , _length_ticks(0)
- , _start_beats(0)
- , _length_beats(0)
- , _offset_ticks(0)
- {}
-
-
- /** Set the start and length of the slice.
- *
- * Note that external offset is not affected by this, don't forget to reset
- * the offset each cycle!
- */
- void set_window(TickTime start, TickCount length) {
- _start_ticks = start;
- _length_ticks = length;
- update_beat_time();
- }
-
- void set_start(TickTime time) { _start_ticks = time; update_beat_time(); }
-
- void set_length(TickCount length) { _length_ticks = length; update_beat_time(); }
-
- bool contains(TickTime time) {
- return (time >= start_ticks() && time < start_ticks() + length_ticks());
- }
-
- double tick_rate() { return _tick_rate; }
- double beat_rate() { return _beat_rate; }
- double bpm() { return 60/_beat_rate; }
-
- void set_tick_rate(double tick_rate) {
- _tick_rate = tick_rate;
- update_beat_time();
- }
-
- void set_bpm(double bpm) {
- _beat_rate = 60.0/bpm;
- update_beat_time();
- }
-
- inline Seconds beats_to_seconds(BeatTime beats) const {
- return (beats * _beat_rate);
- }
-
- inline TickTime beats_to_ticks(BeatTime beats) const {
- return static_cast<TickTime>(floor(beats_to_seconds(beats) / _tick_rate));
- }
-
- inline Seconds ticks_to_seconds(TickTime ticks) const {
- return (ticks * _tick_rate);
- }
-
- inline BeatTime ticks_to_beats(TickTime ticks) const {
- return ticks_to_seconds(ticks) / _beat_rate;
- }
-
- /** Start of current sub-cycle in ticks */
- inline TickTime start_ticks() const { return _start_ticks; }
-
- /** Length of current sub-cycle in ticks */
- inline TickCount length_ticks() const { return _length_ticks; }
-
- /** Start of current sub-cycle in beats */
- inline BeatTime start_beats() const { return _start_beats; }
-
- /** Length of current sub-cycle in beats */
- inline BeatCount length_beats() const { return _length_beats; }
-
-
- // Real-time conversion
-/*
- TickCount ticks_to_offset(TickTime time) {
- assert(time >= _start_ticks);
- TickCount ret = time - _start_ticks + _offset_ticks;
- assert(ret < _offset_ticks + _length_ticks);
- return ret;
- }
-*/
- /** Set the offset between real-time and timeslice-time. */
- inline void set_offset(TickCount offset) { _offset_ticks = offset; }
- /** Offset relative to external (e.g Jack) time */
- inline TickCount offset_ticks() const { return _offset_ticks; }
-
-private:
-
- inline void update_beat_time() {
- _start_beats = ticks_to_beats(_start_ticks);
- _length_beats = ticks_to_beats(_length_ticks);
- }
-
- // Rate/Tempo
- double _tick_rate; ///< Tick rate in Hz (e.g. sample rate)
- double _beat_rate; ///< Beat rate in Hz
-
- // Current time
- TickTime _start_ticks; ///< Current window start in ticks
- TickCount _length_ticks; ///< Current window length in ticks
- BeatTime _start_beats; ///< Current window start in beats
- BeatCount _length_beats; ///< Current window length in beats
-
- TickCount _offset_ticks; ///< Offset to global time (ie Jack sub-cycle offset)
-};
-
-
-} // namespace Raul
-
-#endif // RAUL_TIMESLICE_H