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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/***************************************************************************
* audiocache.h
*
* Fri Apr 10 10:39:24 CEST 2015
* Copyright 2015 Jonas Suhr Christensen
* jsc@umbraculum.org
****************************************************************************/
/*
* This file is part of DrumGizmo.
*
* DrumGizmo 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.
*
* DrumGizmo 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 more details.
*
* You should have received a copy of the GNU General Public License
* along with DrumGizmo; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#pragma once
#include <string>
#include <list>
#include <vector>
#include "audiotypes.h"
#include "audiofile.h"
#include "audiocachefile.h"
#include "audiocacheidmanager.h"
#include "audiocacheeventhandler.h"
#define CHUNK_MULTIPLIER 16
//TODO:
// 1: Move nodata initialisation to init method.
// 2: Make semaphore in thread to block init call until thread has been started.
//// next
// Pre: preloaded contains 2 x framesize. chunk size is framesize.
// allocate 2 chunks and copy initial_samples_needed to first buffer from
// preloaded data and enough to fill up the second buffer from preloaded
// returns the first buffer and its size in &size.
// get id from "free stack" and store pointers to buffers in id vector.
// event: open sndfile handle (if not already open) and increase refcount
//// next
// Return which ever buffer is the front, swap them and add event to load the
// next chunk.
//// close
// decrement file handle refcounter and close file if it is 0.
// free the 2 buffers
// (do not erase from the id vector), push index to
// "free stack" for reuse.
class AudioCache {
public:
AudioCache() = default;
//! Destroy object and stop thread if needed.
~AudioCache();
//! Initialise cache manager and allocate needed resources
//! This method starts the cache manager thread.
//! This method blocks until the thread has been started.
//! \param poolsize The maximum number of parellel events supported.
void init(size_t poolsize);
//! Stop thread and clean up resources.
//! This method blocks until the thread has stopped.
void deinit();
//! Register new cache entry.
//! Prepares an entry in the cache manager for future disk streaming.
//! \param file A pointer to the file which is to be streamed from.
//! \param initial_samples_needed The number of samples needed in the first
//! read that is not nessecarily of framesize. This is the number of samples
//! from the input event offset to the end of the frame in which it resides.
//! initial_samples_needed <= framesize.
//! \param channel The channel to which the cache id will be bound.
//! \param [out] new_id The newly created cache id.
//! \return A pointer to the first buffer containing the
//! 'initial_samples_needed' number of samples.
sample_t* open(AudioFile* file, size_t initial_samples_needed, int channel,
cacheid_t& new_id);
//! Get next buffer.
//! Returns the next buffer for reading based on cache id.
//! This function will (if needed) schedule a new disk read to make sure that
//! data is available in the next call to this method.
//! \param id The cache id to read from.
//! \param [out] size The size of the returned buffer.
//! \return A pointer to the buffer.
sample_t* next(cacheid_t id, size_t &size);
//! Returns if the next chunk of the supplied id has been read from disk.
bool isReady(cacheid_t id);
//! Unregister cache entry.
//! Close associated file handles and free associated buffers.
//! \param id The cache id to close.
void close(cacheid_t id);
//! Set/get internal framesize used when iterating through cache buffers.
void setFrameSize(size_t framesize);
size_t frameSize() const;
//! Control/get reader threaded mode.
//! True means reading happening threaded, false means all reading done
//! synchronious.
void setAsyncMode(bool async);
bool asyncMode() const;
//! Return the number of chunks that were read too late.
size_t getNumberOfUnderruns() const;
//! Set underrun counter to 0.
void resetNumberOfUnderruns();
private:
size_t framesize{0};
sample_t *nodata{nullptr};
size_t numberOfUnderruns{0};
AudioCacheIDManager idManager;
AudioCacheEventHandler eventHandler{idManager};
};
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