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authorBent Bisballe Nyeng <deva@aasimon.org>2016-01-19 08:32:44 +0100
committerBent Bisballe Nyeng <deva@aasimon.org>2016-01-20 13:33:45 +0100
commit7788892bfb8aaceaa67fccad1ea4aff325a5ac32 (patch)
treef86a2892629760037b1221cc1306ba6b703a2e70 /src/cachemanager.h
parent189cce0e23dddaaaf4ab6e1cac387c9c954f22fa (diff)
Split CacheManager into several AudioCache classes and refactored the lot of them. Unit tests added.
Diffstat (limited to 'src/cachemanager.h')
-rw-r--r--src/cachemanager.h221
1 files changed, 0 insertions, 221 deletions
diff --git a/src/cachemanager.h b/src/cachemanager.h
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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.
- */
-#pragma once
-
-#include <string>
-#include <list>
-#include <vector>
-
-#include "thread.h"
-#include "semaphore.h"
-#include "mutex.h"
-
-#include "audiotypes.h"
-#include "audiofile.h"
-#include "cacheaudiofile.h"
-
-#define CACHE_DUMMYID -2
-#define CACHE_NOID -1
-
-#define CHUNK_MULTIPLIER 16
-
-class AudioFile;
-class CacheAudioFile;
-class CacheAudioFiles;
-
-typedef int cacheid_t;
-
-class CacheChannel {
-public:
- size_t channel;
- sample_t* samples;
- size_t num_samples;
- volatile bool* ready;
-};
-
-class CacheChannels : public std::list<CacheChannel> {};
-
-//TODO:
-// 1: Move nodata initialisation to init method.
-// 2: Make semaphore in thread to block init call until thread has been started.
-
-//// next
-// 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
-
-//// next
-// Return which ever buffer is the front, swap them and add event to load the
-// next chunk.
-
-//// close
-// 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.
-
-class CacheManager : public Thread {
-public:
- /**
- * Empty constructor...
- */
- CacheManager();
-
- /**
- * Destroy object and stop thread if needed.
- */
- ~CacheManager();
-
- /**
- * Initialise cache manager and allocate needed resources
- * This method starts the cache manager thread.
- * This method blocks until the thread has been started.
- * @param poolsize The maximum number of parellel events supported.
- */
- void init(size_t poolsize, bool threaded);
-
- /**
- * Stop thread and clean up resources.
- * This method blocks until the thread has stopped.
- */
- void deinit();
-
- /**
- * Register new cache entry.
- * Prepares an entry in the cache manager for future disk streaming.
- * @param file A pointer to the file which is to be streamed from.
- * @param initial_samples_needed The number of samples needed in the first
- * read that is not nessecarily of framesize. This is the number of samples
- * from the input event offset to the end of the frame in which it resides.
- * initial_samples_needed <= framesize.
- * @param channel The channel to which the cache id will be bound.
- * @param [out] new_id The newly created cache id.
- * @return A pointer to the first buffer containing the
- * 'initial_samples_needed' number of samples.
- */
- sample_t *open(AudioFile *file, size_t initial_samples_needed, int channel,
- cacheid_t &new_id);
-
- /**
- * Get next buffer.
- * Returns the next buffer for reading based on cache id.
- * This function will (if needed) schedule a new disk read to make sure that
- * data is available in the next call to this method.
- * @param id The cache id to read from.
- * @param [out] size The size of the returned buffer.
- * @return A pointer to the buffer.
- */
- sample_t *next(cacheid_t id, size_t &size);
-
- /**
- * Unregister cache entry.
- * Close associated file handles and free associated buffers.
- * @param id The cache id to close.
- */
- void close(cacheid_t id);
-
- /**
- * Set internal framesize used when iterating through cache buffers.
- */
- void setFrameSize(size_t framesize);
-
- /**
- * Control reader thread.
- * Set to true to make reading happen threaded, false to do all reading sync.
- */
- void setAsyncMode(bool async);
-
-private:
- ///! Internal thread main method
- void thread_main();
-
- size_t framesize;
- sample_t *nodata;
-
- typedef struct {
- CacheAudioFile* afile;
- size_t channel;
- size_t pos; //< File possition
- volatile bool ready;
- sample_t *front;
- sample_t *back;
- size_t localpos; //< Intra buffer (front) position.
-
- sample_t* preloaded_samples; // NULL means not active.
- size_t preloaded_samples_size;
-
- } cache_t;
-
- typedef enum {
- LOADNEXT = 0,
- CLOSE = 1
- } cmd_t;
-
- typedef struct {
- cmd_t cmd;
-
- // For close event:
- cacheid_t id;
-
- // For load next event:
- size_t pos;
- CacheAudioFile* afile;
- CacheChannels channels;
- } cevent_t;
-
- cevent_t createLoadNextEvent(CacheAudioFile* afile, size_t channel,
- size_t pos, sample_t* buffer,
- volatile bool* ready);
- cevent_t createCloseEvent(cacheid_t id);
-
- void handleLoadNextEvent(cevent_t& e);
- void handleCloseEvent(cevent_t& e);
- void handleCloseCache(cacheid_t& cacheid);
-
- void handleEvent(cevent_t& e);
- void pushEvent(cevent_t& e);
-
- std::vector<cache_t> id2cache;
-
- // Protected by mutex:
- std::list<cevent_t> eventqueue;
- std::list<cacheid_t> availableids;
-
- Mutex m_events;
- Mutex m_ids;
-
- bool threaded; // Indicates if we are running in thread mode or offline mode.
- Semaphore sem;
- Semaphore sem_run;
- bool running;
-
- CacheAudioFiles files;
- //std::map<std::string, CacheAudioFile*> files;
-};