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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>
#define CHUNKSIZE 256
sample_t nodata[CHUNKSIZE];
CacheManager::CacheManager()
{
for(int i = 0; i < CHUNKSIZE; i++) {
nodata[i] = 0;
}
}
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, size_t initial_samples_needed, int channel, cacheid_t &id)
{
m_ids.lock();
if(availableids.empty()) {
id = CACHE_DUMMYID;
}
else {
id = availableids.front();
availableids.pop_front();
}
m_ids.unlock();
if(id == CACHE_DUMMYID) {
return nodata;
}
if(initial_samples_needed < file->size) {
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 = createEvent(id, LOADNEXT);
pushEvent(e);
}
return file->data;
}
void CacheManager::close(cacheid_t id)
{
if(id == CACHE_DUMMYID) return;
{
event_t e = createEvent(id, CLEAN);
MutexAutolock l(m_events);
eventqueue.push_front(e);
}
{
MutexAutolock l(m_ids);
availableids.push_back(id);
}
// Clean cache_t mapped to event
// Decrement audiofile ref count
}
sample_t *CacheManager::next(cacheid_t id, size_t &size)
{
size = CHUNKSIZE;
if(id == CACHE_DUMMYID) {
return nodata;
}
m_caches.lock();
cache_t c = id2cache[id];
c.pos += size;
id2cache[id] = c;
m_caches.unlock();
// If more is left of file
if(c.pos < c.file->size) {
event_t e = createEvent(id, LOADNEXT);
pushEvent(e);
}
sample_t *s = c.file->data + c.pos;
return s;
}
void CacheManager::loadNext(cacheid_t id)
{
MutexAutolock l(m_caches);
cache_t c = id2cache[id];
c.pos += CHUNKSIZE;
id2cache[id] = c;
}
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();
if(!e.active) continue;
switch(e.cmd) {
case LOADNEXT:
loadNext(e.id);
break;
case CLEAN:
break;
}
}
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).
{
MutexAutolock l(m_events);
eventqueue.push_back(e);
}
sem.post();
}
CacheManager::event_t CacheManager::createEvent(cacheid_t id, cmd_t cmd)
{
event_t e;
e.active = true;
e.id = id;
e.cmd = cmd;
return e;
}
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