Implemented cRecording::NumFrames() and cRecording::LengthInSeconds()

CONTRIBUTORS

@@ -743,6 +743,7 @@ Steffen Barszus <st_barszus@gmx.de>
  for helping to debug a crash when using the --terminal option without having access
  to the given terminal
  for fixing following symbolic links in RemoveFileOrDir()
+ for suggesting to cache the length of a recording's index
 
 Peter Seyringer <e9425234@student.tuwien.ac.at>
  for reporting a bug in saving the polarization parameter of channels that have a

HISTORY

@@ -6715,3 +6715,6 @@ Video Disk Recorder Revision History
   exposes these members, so that existing plugins will still compile. Comment out
   this #define to check whether a particular plugin needs to be modified.
   This #define may be removed in a future version.
+- The new functions cRecording::NumFrames() and cRecording::LengthInSeconds() return
+  the number of frames and length (in seconds) of a recording (suggested by Steffen
+  Barszus).

recording.c

@@ -4,7 +4,7 @@
  * See the main source file 'vdr.c' for copyright information and
  * how to reach the author.
  *
- * $Id: recording.c 2.35 2011/08/21 11:19:55 kls Exp $
+ * $Id: recording.c 2.36 2011/08/21 13:43:03 kls Exp $
  */
 
 #include "recording.h"
@@ -60,6 +60,7 @@
 #define DISKCHECKDELTA    100 // seconds between checks for free disk space
 #define REMOVELATENCY      10 // seconds to wait until next check after removing a file
 #define MARKSUPDATEDELTA   10 // seconds between checks for updating editing marks
+#define MININDEXAGE      3600 // seconds before an index file is considered no longer to be written
 
 #define MAX_SUBTITLE_LENGTH  40
 
@@ -617,6 +618,7 @@ cRecording::cRecording(cTimer *Timer, const cEvent *Event)
   instanceId = InstanceId;
   isPesRecording = false;
   framesPerSecond = DEFAULTFRAMESPERSECOND;
+  numFrames = -1;
   deleted = 0;
   // set up the actual name:
   const char *Title = Event ? Event->Title() : NULL;
@@ -676,6 +678,7 @@ cRecording::cRecording(const char *FileName)
   lifetime = MAXLIFETIME;
   isPesRecording = false;
   framesPerSecond = DEFAULTFRAMESPERSECOND;
+  numFrames = -1;
   deleted = 0;
   titleBuffer = NULL;
   sortBuffer = NULL;
@@ -1031,6 +1034,25 @@ void cRecording::ResetResume(void) const
   resume = RESUME_NOT_INITIALIZED;
 }
 
+int cRecording::NumFrames(void) const
+{
+  if (numFrames < 0) {
+     int nf = cIndexFile::GetLength(FileName(), IsPesRecording());
+     if (time(NULL) - LastModifiedTime(FileName()) < MININDEXAGE)
+        return nf; // check again later for ongoing recordings
+     numFrames = nf;
+     }
+  return numFrames;
+}
+
+int cRecording::LengthInSeconds(void) const
+{
+  int nf = NumFrames();
+  if (nf >= 0)
+     return int((nf / FramesPerSecond() + 30) / 60) * 60;
+  return -1;
+}
+
 // --- cRecordings -----------------------------------------------------------
 
 cRecordings Recordings;
@@ -1102,6 +1124,7 @@ void cRecordings::ScanVideoDir(const char *DirName, bool Foreground, int LinkLev
                  if (endswith(buffer, deleted ? DELEXT : RECEXT)) {
                     cRecording *r = new cRecording(buffer);
                     if (r->Name()) {
+                       r->NumFrames(); // initializes the numFrames member
                        Lock();
                        Add(r);
                        ChangeState();
@@ -1514,9 +1537,6 @@ void cIndexFileGenerator::Action(void)
 // The maximum time to wait before giving up while catching up on an index file:
 #define MAXINDEXCATCHUP   8 // seconds
 
-// The minimum age of an index file for considering it no longer to be written:
-#define MININDEXAGE    3600 // seconds
-
 struct tIndexPes {
   uint32_t offset;
   uchar type;

recording.h

@@ -4,7 +4,7 @@
  * See the main source file 'vdr.c' for copyright information and
  * how to reach the author.
  *
- * $Id: recording.h 2.24 2011/08/21 11:34:03 kls Exp $
+ * $Id: recording.h 2.25 2011/08/21 13:10:39 kls Exp $
  */
 
 #ifndef __RECORDING_H
@@ -89,6 +89,7 @@ private:
   mutable char *fileName;
   mutable char *name;
   mutable int fileSizeMB;
+  mutable int numFrames;
   int channel;
   int instanceId;
   bool isPesRecording;
@@ -123,6 +124,11 @@ public:
   int HierarchyLevels(void) const;
   void ResetResume(void) const;
   double FramesPerSecond(void) const { return framesPerSecond; }
+  int NumFrames(void) const;
+       ///< Returns the number of frames in this recording.
+       ///< If the number of frames is unknown, -1 will be returned.
+  int LengthInSeconds(void) const;
+       ///< Returns the length (in seconds) of this recording, or -1 in case of error.
   bool IsNew(void) const { return GetResume() <= 0; }
   bool IsEdited(void) const;
   bool IsPesRecording(void) const { return isPesRecording; }