Improved fast-forward/-rewind for audio recordings

HISTORY

@@ -5912,7 +5912,7 @@ Video Disk Recorder Revision History
   can handle DVB-S2. The #define is still there to allow people with older drivers
   who don't need DVB-S2 to use this version without pathcing.
 
-2009-01-24: Version 1.7.4
+2009-01-25: Version 1.7.4
 
 - Removed the '#define FE_CAN_2ND_GEN_MODULATION', since it was wrong and the
   flag is now in the driver, anyway.
@@ -5966,3 +5966,15 @@ Video Disk Recorder Revision History
 - The PAT/PMT is now only processed if its version changes (reported by Reinhard
   Nissl).
 - Fixed handling the maximum video file size (reported by Udo Richter).
+- Improved fast-forward/-rewind for audio recordings. The actual data is now sent
+  to the output device, so that it can be replayed and thus cause the proper delay.
+  For pure audio recordings the audio is no longer muted in fast-forward/-rewind
+  mode, so that some orientation regarding the position within the recording is
+  possible. There may still be some offset in the replay position displayed by the
+  progress indicator when switching from fast-forward/-rewind to play mode, as well
+  as in the current position during normal play mode. This is due to the various
+  buffers between the player and the output device and will be addressed later.
+  Note the new function cDevice::IsPlayingVideo(), which is used to inform the
+  player whether there is video data in the currently replayed stream. If a derived
+  cDevice class reimplements PlayTs() or PlayPes(), it also needs to make sure this
+  new function works as expected.

PLUGINS.html

@@ -16,7 +16,10 @@ html, body {
     text-align: center;
 }
 .code {
-    background-color: #f0f0f0;
+    background-color: #F0F0F0;
+}
+.modified {
+    background-color: #FFDDDD;
 }
 </style>
 </head>
@@ -25,12 +28,15 @@ html, body {
 <div class="center">
 <h1>The VDR Plugin System</h1>
 
-<b>Version 1.6</b>
+<b>Version 1.7</b>
 <p>
-Copyright &copy; 2008 Klaus Schmidinger<br>
+Copyright &copy; 2009 Klaus Schmidinger<br>
 <a href="mailto:kls@cadsoft.de">kls@cadsoft.de</a><br>
 <a href="http://www.cadsoft.de/vdr">www.cadsoft.de/vdr</a>
 </div>
+<div class="modified">
+Important modifications introduced since version 1.6 are marked like this.
+</div modified>
 <p>
 VDR provides an easy to use plugin interface that allows additional functionality
 to be added to the program by implementing a dynamically loadable library file.
@@ -1844,6 +1850,9 @@ virtual bool HasDecoder(void) const;
 virtual bool CanReplay(void) const;
 virtual bool SetPlayMode(ePlayMode PlayMode);
 virtual int64_t GetSTC(void);
+<div class="modified">
+virtual bool IsPlayingVideo(void) const;
+</div modified>
 virtual bool HasIBPTrickSpeed(void);
 virtual void TrickSpeed(int Speed);
 virtual void Clear(void);

device.c

@@ -4,7 +4,7 @@
  * See the main source file 'vdr.c' for copyright information and
  * how to reach the author.
  *
- * $Id: device.c 2.10 2009/01/24 13:40:54 kls Exp $
+ * $Id: device.c 2.11 2009/01/25 11:10:56 kls Exp $
  */
 
 #include "device.h"
@@ -81,6 +81,7 @@ cDevice::cDevice(void)
   startScrambleDetection = 0;
 
   player = NULL;
+  isPlayingVideo = false;
   ClrAvailableTracks();
   currentAudioTrack = ttNone;
   currentAudioTrackMissingCount = 0;
@@ -1099,6 +1100,7 @@ void cDevice::Detach(cPlayer *Player)
      SetVideoDisplayFormat(eVideoDisplayFormat(Setup.VideoDisplayFormat));
      PlayTs(NULL, 0);
      Audios.ClearAudio();
+     isPlayingVideo = false;
      }
 }
 
@@ -1151,6 +1153,7 @@ int cDevice::PlayPesPacket(const uchar *Data, int Length, bool VideoOnly)
         switch (c) {
           case 0xBE:          // padding stream, needed for MPEG1
           case 0xE0 ... 0xEF: // video
+               isPlayingVideo = true;
                w = PlayVideo(Start, d);
                break;
           case 0xC0 ... 0xDF: // audio
@@ -1322,8 +1325,10 @@ int cDevice::PlayTs(const uchar *Data, int Length, bool VideoOnly)
            patPmtParser.ParsePat(Data, Length);
         else if (Pid == patPmtParser.PmtPid())
            patPmtParser.ParsePmt(Data, Length);
-        else if (Pid == patPmtParser.Vpid())
+        else if (Pid == patPmtParser.Vpid()) {
+           isPlayingVideo = true;
            return PlayTsVideo(Data, Length);
+           }
         else if (Pid == availableTracks[currentAudioTrack].id) {
            if (!VideoOnly || HasIBPTrickSpeed()) {
               int w = PlayTsAudio(Data, Length);

device.h

@@ -4,7 +4,7 @@
  * See the main source file 'vdr.c' for copyright information and
  * how to reach the author.
  *
- * $Id: device.h 2.5 2009/01/10 10:04:30 kls Exp $
+ * $Id: device.h 2.6 2009/01/25 11:04:39 kls Exp $
  */
 
 #ifndef __DEVICE_H
@@ -477,6 +477,7 @@ private:
   cTsToPes tsToPesVideo;
   cTsToPes tsToPesAudio;
   cTsToPes tsToPesSubtitle;
+  bool isPlayingVideo;
 protected:
   virtual bool CanReplay(void) const;
        ///< Returns true if this device can currently start a replay session.
@@ -542,6 +543,9 @@ public:
        ///< Gets the current System Time Counter, which can be used to
        ///< synchronize audio and video. If this device is unable to
        ///< provide the STC, -1 will be returned.
+  virtual bool IsPlayingVideo(void) const { return isPlayingVideo; }
+       ///< \return Returns true if the currently attached player has delivered
+       ///< any video packets.
   virtual bool HasIBPTrickSpeed(void) { return false; }
        ///< Returns true if this device can handle all frames in 'fast forward'
        ///< trick speeds.

dvbplayer.c

@@ -4,7 +4,7 @@
  * See the main source file 'vdr.c' for copyright information and
  * how to reach the author.
  *
- * $Id: dvbplayer.c 2.2 2009/01/24 11:42:07 kls Exp $
+ * $Id: dvbplayer.c 2.3 2009/01/25 11:11:39 kls Exp $
  */
 
 #include "dvbplayer.h"
@@ -412,8 +412,12 @@ void cDvbPlayer::Action(void)
                           if (index->Get(readIndex + 1, &FileNumber, &FileOffset, NULL, &Length))
                              Index = readIndex + 1;
                           }
-                       else
+                       else {
-                          Index = index->GetNextIFrame(readIndex, playDir == pdForward, &FileNumber, &FileOffset, &Length, TimeShiftMode);
+                          int d = int(round(0.4 * framesPerSecond));
+                          if (playDir != pdForward)
+                             d = -d;
+                          Index = index->GetNextIFrame(readIndex + d, playDir == pdForward, &FileNumber, &FileOffset, &Length, TimeShiftMode);
+                          }
                        if (Index >= 0) {
                           if (!NextFile(FileNumber, FileOffset)) {
                              readIndex = Index;
@@ -516,9 +520,9 @@ void cDvbPlayer::Action(void)
               if (p) {
                  int w;
                  if (isPesRecording)
-                    w = PlayPes(p, pc, playMode != pmPlay);
+                    w = PlayPes(p, pc, playMode != pmPlay && DeviceIsPlayingVideo());
                  else
-                    w = PlayTs(p, TS_SIZE, playMode != pmPlay);
+                    w = PlayTs(p, TS_SIZE, playMode != pmPlay && DeviceIsPlayingVideo());
                  if (w > 0) {
                     p += w;
                     pc -= w;
@@ -593,7 +597,8 @@ void cDvbPlayer::Forward(void)
             LOCK_THREAD;
             if (!(DeviceHasIBPTrickSpeed() && playDir == pdForward))
                Empty();
-            DeviceMute();
+            if (DeviceIsPlayingVideo())
+               DeviceMute();
             playMode = pmFast;
             playDir = pdForward;
             trickSpeed = NORMAL_SPEED;
@@ -639,7 +644,8 @@ void cDvbPlayer::Backward(void)
        case pmPlay: {
             LOCK_THREAD;
             Empty();
-            DeviceMute();
+            if (DeviceIsPlayingVideo())
+               DeviceMute();
             playMode = pmFast;
             playDir = pdBackward;
             trickSpeed = NORMAL_SPEED;

player.h

@@ -4,7 +4,7 @@
  * See the main source file 'vdr.c' for copyright information and
  * how to reach the author.
  *
- * $Id: player.h 2.2 2009/01/05 13:04:10 kls Exp $
+ * $Id: player.h 2.3 2009/01/25 11:03:44 kls Exp $
  */
 
 #ifndef __PLAYER_H
@@ -26,6 +26,7 @@ protected:
   bool DevicePoll(cPoller &Poller, int TimeoutMs = 0) { return device ? device->Poll(Poller, TimeoutMs) : false; }
   bool DeviceFlush(int TimeoutMs = 0) { return device ? device->Flush(TimeoutMs) : true; }
   bool DeviceHasIBPTrickSpeed(void) { return device ? device->HasIBPTrickSpeed() : false; }
+  bool DeviceIsPlayingVideo(void) { return device ? device->IsPlayingVideo() : false; }
   void DeviceTrickSpeed(int Speed) { if (device) device->TrickSpeed(Speed); }
   void DeviceClear(void) { if (device) device->Clear(); }
   void DevicePlay(void) { if (device) device->Play(); }