blob: d440415eaddd99062038f51147d72d860b2709c6 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
|
/* -*- 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 <cstdlib>
#include <vector>
#include <mutex>
#include "audiotypes.h"
#include "owner.h"
class AudioCacheFile;
using cacheid_t = int;
constexpr cacheid_t CACHE_DUMMYID{-2};
constexpr cacheid_t CACHE_NOID{-1};
class CacheBuffer
{
public:
void allocBack(std::size_t chunk_size);
void deleteChunks() const;
void swap() noexcept;
cacheid_t id{CACHE_NOID}; //< Current id of this CacheBuffer. CACHE_NOID means not in use.
AudioCacheFile* afile{};
size_t channel{};
size_t pos{}; //< File position
volatile bool ready{false};
gsl::owner<sample_t*> front{};
gsl::owner<sample_t*> back{};
size_t localpos{}; //< Intra buffer (front) position.
sample_t* preloaded_samples{}; // nullptr means preload buffer not active.
size_t preloaded_samples_size{};
};
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.
CacheBuffer& getCache(cacheid_t cacheid);
//! 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 CacheBuffer& cache);
//! Release a cache object and its correseponding cacheid.
//! After this call the cacheid can no longer be used.
void releaseID(cacheid_t cacheid);
protected:
// For AudioCacheEventHandler
void disableActive();
std::vector<cacheid_t> getActiveIDs();
std::mutex mutex;
std::vector<CacheBuffer> id2cache;
std::vector<cacheid_t> available_ids;
};
|
