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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/***************************************************************************
* cachemanager.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.
*/
#ifndef __DRUMGIZMO_CACHEMANAGER_H__
#define __DRUMGIZMO_CACHEMANAGER_H__
#include <string>
#include <list>
#include <vector>
#include "thread.h"
#include "semaphore.h"
#include "mutex.h"
#include "audiotypes.h"
#include "audiofile.h"
#define CACHEMANAGER_NOID -1
class AudioFile;
typedef int cacheid_t;
class CacheManager : public Thread {
public:
CacheManager();
~CacheManager();
void init(int poolsize);
void deinit();
void thread_main();
// 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
sample_t *open(AudioFile *file, size_t initial_samples_needed, int channel, cacheid_t &new_id);
// Return which ever buffer is the front, swap them and add event to load the
// next chunk.
sample_t *next(cacheid_t id, size_t &size);
// 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.
void close(cacheid_t id);
// id vector:
// {
// AudioFile*
// channel
// buffer1, buffer2
// position
// (ready?)
// }
private:
void pushEvent();
typedef struct {
AudioFile *file;
int channel;
size_t pos;
void *a;
void *b;
} cache_t;
enum cmd_t {
LOADNEXT = 0,
CLEAN = 1
};
typedef struct {
bool active;
cacheid_t id;
cmd_t cmd;
} event_t;
CacheManager::event_t createEvent(cacheid_t id, cmd_t type);
void loadNext(cacheid_t id);
void pushEvent(event_t e);
// Protected by mutex
std::list<event_t> eventqueue;
std::list<cacheid_t> availableids;
std::vector<cache_t> id2cache;
Mutex m_events;
Mutex m_ids;
Mutex m_caches;
Semaphore sem;
int running;
};
#endif/*__DRUMGIZMO_CACHEMANAGER_H__*/
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