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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/***************************************************************************
* audiocacheidmanager.h
*
* Tue Jan 5 10:59:37 CET 2016
* Copyright 2016 Bent Bisballe Nyeng
* deva@aasimon.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 Lesser General Public License as published by
* the Free Software Foundation; either version 3 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser 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 <stdlib.h>
#include <vector>
#include <audiotypes.h>
#include <mutex>
class AudioCacheFile;
#define CACHE_DUMMYID -2
#define CACHE_NOID -1
typedef int cacheid_t;
struct cache_t
{
cacheid_t id{CACHE_NOID}; //< Current id of this cache_t. CACHE_NOID means not in use.
AudioCacheFile* afile{nullptr};
size_t channel{0};
size_t pos{0}; //< File position
volatile bool ready{false};
sample_t* front{nullptr};
sample_t* back{nullptr};
size_t localpos{0}; //< Intra buffer (front) position.
sample_t* preloaded_samples{nullptr}; // nullptr means preload buffer not active.
size_t preloaded_samples_size{0};
};
class AudioCacheIDManager
{
friend class AudioCacheEventHandler;
public:
AudioCacheIDManager() = default;
~AudioCacheIDManager();
//! Initialise id lists with specified capacity.
//! Exceeding this capacity will result in CACHE_DUMMYID on calls to
//! registerID.
void init(unsigned int capacity);
//! Get the cache object connected with the specified cacheid.
//! Note: The cacheid MUST be active.
cache_t& getCache(cacheid_t id);
//! Reserve a new cache object and return its cacheid.
//! The contents of the supplied cache object will be copied to the new
//! cache object.
cacheid_t registerID(const cache_t& cache);
//! Release a cache object and its correseponding cacheid.
//! After this call the cacheid can no longer be used.
void releaseID(cacheid_t id);
protected:
// For AudioCacheEventHandler
void disableActive();
std::vector<cacheid_t> getActiveIDs();
std::mutex mutex;
std::vector<cache_t> id2cache;
std::vector<cacheid_t> available_ids;
};
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