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/*
* videodir.h: Functions to maintain the video directory
*
* See the main source file 'vdr.c' for copyright information and
* how to reach the author.
*
* $Id: videodir.h 4.1 2015/08/10 13:21:29 kls Exp $
*/
#ifndef __VIDEODIR_H
#define __VIDEODIR_H
#include <stdlib.h>
#include "tools.h"
class cVideoDirectory {
private:
static cMutex mutex;
static cString name;
static cVideoDirectory *current;
static cVideoDirectory *Current(void);
public:
cVideoDirectory(void);
virtual ~cVideoDirectory();
virtual int FreeMB(int *UsedMB = NULL);
///< Returns the total amount (in MB) of free disk space for recording.
///< If UsedMB is given, it returns the amount of disk space in use by
///< existing recordings (or anything else) on that disk.
virtual bool Register(const char *FileName);
///< By default VDR assumes that the video directory consists of one large
///< volume, on which it can store its recordings. A derived cVideoDirectory
///< may, for instance, use several separate disks to store recordings.
///< The given FileName is the full path name (including the video directory) of
///< a recording file ('*.ts') that is about to be opened for writing. If the actual
///< file shall be put on an other disk, the derived cVideoDirectory should
///< create a symbolic link from the given FileName to the other location.
///< Returns true if the operation was successful.
///< The default implementation just checks whether the incoming file name really
///< is under the video directory.
virtual bool Rename(const char *OldName, const char *NewName);
///< Renames the directory OldName to NewName.
///< OldName and NewName are full path names that begin with the name of the
///< video directory and end with '*.rec' or '*.del'. Only the base name (the
///< rightmost component) of the two names may be different.
///< Returns true if the operation was successful.
///< The default implementation just calls the system's rename() function.
virtual bool Move(const char *FromName, const char *ToName);
///< Moves the directory FromName to the location ToName. FromName is the full
///< path name of a recording's '*.rec' directory. ToName has the same '*.rec'
///< part as FromName, but a different directory path above it.
///< Returns true if the operation was successful.
///< The default implementation just calls the system's rename() function.
virtual bool Remove(const char *Name);
///< Removes the directory with the given Name and everything it contains.
///< Name is a full path name that begins with the name of the video directory.
///< Returns true if the operation was successful.
///< The default implementation calls RemoveFileOrDir().
virtual void Cleanup(const char *IgnoreFiles[] = NULL);
///< Recursively removes all empty directories under the video directory.
///< If IgnoreFiles is given, the file names in this (NULL terminated) array
///< are ignored when checking whether a directory is empty. These are
///< typically "dot files", like e.g. ".sort".
///< The default implementation calls RemoveEmptyDirectories().
virtual bool Contains(const char *Name);
///< Checks whether the directory Name is on the same file system as the
///< video directory. Name is the full path name of a recording's '*.rec'
///< directory. This function is usually called when an ongoing recording
///< is about to run out of disk space, and an existing (old) recording needs
///< to be deleted. It shall make sure that deleting this old recording will
///< actually free up space in the video directory, and not on some other
///< device that just happens to be mounted.
///< The default implementation calls EntriesOnSameFileSystem().
static const char *Name(void);
static void SetName(const char *Name);
static void Destroy(void);
static cUnbufferedFile *OpenVideoFile(const char *FileName, int Flags);
static bool RenameVideoFile(const char *OldName, const char *NewName);
static bool MoveVideoFile(const char *FromName, const char *ToName);
static bool RemoveVideoFile(const char *FileName);
static bool VideoFileSpaceAvailable(int SizeMB);
static int VideoDiskSpace(int *FreeMB = NULL, int *UsedMB = NULL); // returns the used disk space in percent
static cString PrefixVideoFileName(const char *FileName, char Prefix);
static void RemoveEmptyVideoDirectories(const char *IgnoreFiles[] = NULL);
static bool IsOnVideoDirectoryFileSystem(const char *FileName);
};
class cVideoDiskUsage {
private:
static int state;
static time_t lastChecked;
static int usedPercent;
static int freeMB;
static int freeMinutes;
public:
static bool HasChanged(int &State);
///< Returns true if the usage of the video disk space has changed since the last
///< call to this function with the given State variable. The caller should
///< initialize State to -1, and it will be set to the current internal state
///< value of the video disk usage checker upon return. Future calls with the same
///< State variable can then quickly check for changes.
static void ForceCheck(void) { lastChecked = 0; }
///< To avoid unnecessary load, the video disk usage is only actually checked
///< every DISKSPACECHEK seconds. Calling ForceCheck() makes sure that the next call
///< to HasChanged() will check the disk usage immediately. This is useful in case
///< some files have been deleted and the result shall be displayed instantly.
static cString String(void);
///< Returns a localized string of the form "Disk nn% - hh:mm free".
///< This function is mainly for use in skins that want to retain the display of the
///< free disk space in the menu title, as was the case until VDR version 1.7.27.
///< An implicit call to HasChanged() is done in this function, to make sure the
///< returned value is up to date.
static int UsedPercent(void) { return usedPercent; }
///< Returns the used space of the video disk in percent.
///< The caller should call HasChanged() first, to make sure the value is up to date.
static int FreeMB(void) { return freeMB; }
///< Returns the amount of free space on the video disk in MB.
///< The caller should call HasChanged() first, to make sure the value is up to date.
static int FreeMinutes(void) { return freeMinutes; }
///< Returns the number of minutes that can still be recorded on the video disk.
///< This is an estimate and depends on the data rate of the existing recordings.
///< There is no guarantee that this value will actually be met.
///< The caller should call HasChanged() first, to make sure the value is up to date.
};
#endif //__VIDEODIR_H
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