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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/***************************************************************************
* cachemanager.cc
*
* 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.
*/
#include "cachemanager.h"
#include <stdio.h>
CacheManager::CacheManager()
{
}
CacheManager::~CacheManager()
{
deinit();
}
void CacheManager::init(int poolsize)
{
id2cache.resize(poolsize);
for(int i = 0; i < poolsize; i++) {
availableids.push_back(i);
}
running = true;
run();
}
void CacheManager::deinit()
{
if(!running) return;
running = false;
wait_stop();
}
// Invariant: initial_samples_needed < preloaded audio data
sample_t *CacheManager::open(AudioFile *file, int initial_samples_needed, int channel, cacheid_t &id)
{
// What if no free ids is available?
m_ids.lock();
id = availableids.front();
availableids.pop_front();
m_ids.unlock();
cache_t c;
c.file = file;
c.channel = channel;
c.pos = initial_samples_needed;
// Allocate buffers
// Increase audio ref count
id2cache[id] = c;
event_t e;
e.id = id;
pushEvent(e);
return file->data;
}
void CacheManager::close(cacheid_t id)
{
m_ids.lock();
availableids.push_back(id);
m_ids.unlock();
// Clean cache_t mapped to event
// Clean event list for other events mapped to this id?
// Maybe we need an event for this, that we can push in front of eventqueue (con: we dont read from disk when doing this stuff).
// Decrement audiofile ref count
}
sample_t *CacheManager::next(cacheid_t id, size_t &size)
{
cache_t *c;
{
MutexAutolock l(m_caches);
c = &id2cache[id];
}
size = 256;
sample_t *s = c->file->data + c->pos;
c->pos += size;
return s;
}
void CacheManager::loadNext(cacheid_t id)
{
/*
printf("Loading next...\n");
// If more is left of file
if(false) {
event_t e;
e.id = id;
pushEvent(e);
}
*/
}
void CacheManager::thread_main()
{
while(running) {
sem.wait();
m_events.lock();
if(eventqueue.empty()) {
event_t e = eventqueue.front();
eventqueue.pop_front();
m_events.unlock();
loadNext(e.id);
}
else {
m_events.unlock();
}
}
}
void CacheManager::pushEvent(event_t e)
{
// Check that if event should be merged (Maybe by event queue (ie. push in front).
m_events.lock();
eventqueue.push_back(e);
m_events.unlock();
}
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