Initial design of cache manager.

1 files changed, 84 insertions, 0 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 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.
+ */
+#ifndef __DRUMGIZMO_CACHEMANAGER_H__
+#define __DRUMGIZMO_CACHEMANAGER_H__
+
+#include <string>
+#include <list>
+
+class AudioFile;
+
+class CacheManager {
+public:
+
+  class Request {
+  public:
+    std::string filename;
+    std::map<unsigned int, void*> targets;
+    size_t pos;
+  };
+
+  // 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
+  sample_t *hello(AudioFile *file, int initial_samples_needed, int channel, id_t &new_id);
+
+  // Return which ever buffer is the front, swap them and add event to load the
+  // next chunk.
+  sample_t *getNextBuffer(id_t id, size_t &size);
+
+  // 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.
+  void goodbye(id_t id);
+
+  // id vector:
+  // {
+  //   AudioFile*
+  //   channel
+  //   buffer1, buffer2
+  //   position
+  //   (ready?)
+  // }
+
+private:
+  class File {
+  public:
+    sndfile_t *handle;
+    int refcounter;
+  };
+
+  std::list<Request> requests;
+  std::map<AudioFile *, File>
+
+};
+
+#endif/*__DRUMGIZMO_CACHEMANAGER_H__*/