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//
// AudioClock.h - MrsWatson
// Created by Nik Reiman on 1/5/12.
// Copyright (c) 2012 Teragon Audio. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
//
#ifndef MrsWatson_AudioClock_h
#define MrsWatson_AudioClock_h
#include "base/Types.h"
/**
* The AudioClock class keeps track of the sequence time and delivers the
* position in a variety of formats. Unlike most other classes, this one
* maintains a singleton instance because it must be accessed from C++
* callbacks where it is difficult to pass a void* pointer.
*/
typedef struct {
boolByte transportChanged;
boolByte isPlaying;
unsigned long currentFrame;
} AudioClockMembers;
typedef AudioClockMembers *AudioClock;
extern AudioClock audioClockInstance;
/**
* Initialize the global audio clock instance. Should be called fairly
* early in the program initialization, as other components may depend
* on knowing the current position.
*/
void initAudioClock(void);
/**
* Get a reference to the global audio clock instance.
* @return Reference to global audio clock, or NULL if the global instance has
* not yet been initialized.
*/
AudioClock getAudioClock(void);
/**
* Advanced the global audio clock by a given number of samples. This should be
* called after processing each block.
* @param self
* @param blocksize Block size in sample frames.
*/
void advanceAudioClock(AudioClock self, const unsigned long blocksize);
/**
* Indicate that playback is stopped.
* @param self
*/
void audioClockStop(AudioClock self);
/**
* Free an audio clock instance and its associated resources.
* @param self
*/
void freeAudioClock(AudioClock self);
#endif
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