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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/***************************************************************************
* cacheaudiofile.h
*
* Thu Dec 24 12:17:58 CET 2015
* Copyright 2015 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 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 <map>
#include <mutex>
#include <sndfile.h>
#include <audiotypes.h>
class CacheChannel {
public:
size_t channel;
sample_t* samples;
size_t num_samples;
volatile bool* ready;
};
using CacheChannels = std::list<CacheChannel>;
//! This class is used to encapsulate reading from a single file source.
//! The access is ref counted so that the file is only opened once and closed
//! when it is no longer required.
class AudioCacheFile {
friend class AudioCacheFiles;
friend class TestableAudioCacheFiles;
public:
//! Create file handle for filename.
AudioCacheFile(const std::string& filename);
//! Closes file handle.
~AudioCacheFile();
//! Get sample count of the file connected with this cache object.
size_t getSize() const;
//! Get filename of the file connected with this cache object.
const std::string& getFilename() const;
//! Get number of channels in the file
size_t getChannelCount();
//! Read audio data from the file into the supplied channel caches.
void readChunk(const CacheChannels& channels, size_t pos, size_t num_samples);
private:
int ref{0};
SNDFILE* fh{nullptr};
SF_INFO sf_info;
std::string filename;
};
class AudioCacheFiles {
public:
//! Get the CacheAudioFile object corresponding to filename.
//! If it does not exist it will be created.
//! It's ref count will be increased.
AudioCacheFile& getFile(const std::string& filename);
//! Release the CacheAudioFile corresponding to filename.
//! It's ref count will be decreased.
//! If the ref count reaches 0 the object will be deleted.
void releaseFile(const std::string& filename);
protected:
std::map<std::string, AudioCacheFile*> audiofiles;
std::mutex mutex;
};
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