Skipping unavailable channels when switching with 'Up' and 'Down' keys

HISTORY

@@ -1450,3 +1450,8 @@ Video Disk Recorder Revision History
   cDevice classes.
 - Changed the interface if cDevice::GetTSPacket() to avoid unnecessary copying
   of data.
+- Removed cDevice::Channel(), since this makes no more sense with devices
+  receiving multiple channels.
+- Switching through channels with the 'Up' and 'Down' keys now skips channels
+  that are currently not available (for instance because all devices are
+  recording and these channels are on different transponders).

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 1.17 2002/09/08 09:36:16 kls Exp $
+ * $Id: device.c 1.18 2002/09/08 11:46:53 kls Exp $
  */
 
 #include "device.h"
@@ -30,6 +30,7 @@
 int cDevice::numDevices = 0;
 int cDevice::useDevice = 0;
 int cDevice::nextCardIndex = 0;
+int cDevice::currentChannel = 0;
 cDevice *cDevice::device[MAXDEVICES] = { NULL };
 cDevice *cDevice::primaryDevice = NULL;
 
@@ -41,8 +42,6 @@ cDevice::cDevice(void)
 
   active = false;
 
-  currentChannel = 0;
-
   mute = false;
   volume = Setup.CurrentVolume;
 
@@ -285,6 +284,32 @@ bool cDevice::SwitchChannel(const cChannel *Channel, bool LiveView)
   return false;
 }
 
+bool cDevice::SwitchChannel(int Direction)
+{
+  bool result = false;
+  Direction = sgn(Direction);
+  if (Direction) {
+     int n = CurrentChannel() + Direction;
+     int first = n;
+     for (;;) {
+         cChannel *channel = Channels.GetByNumber(n);
+         if (!channel)
+            break;
+         if (PrimaryDevice()->SwitchChannel(channel, true)) {
+            result = true;
+            break;
+            }
+         n += Direction;
+         }
+     int d = n - first;
+     if (abs(d) == 1)
+        dsyslog("skipped channel %d", first);
+     else if (d)
+        dsyslog("skipped channels %d..%d", first, n - sgn(d));
+     }
+  return result;
+}
+
 eSetChannelResult cDevice::SetChannel(const cChannel *Channel, bool LiveView)
 {
   cStatus::MsgChannelSwitch(this, 0);
@@ -292,10 +317,6 @@ eSetChannelResult cDevice::SetChannel(const cChannel *Channel, bool LiveView)
   if (LiveView)
      StopReplay();
 
-  // Must set this anyway to avoid getting stuck when switching through
-  // channels with 'Up' and 'Down' keys:
-  currentChannel = Channel->number;
-
   // If this card can't receive this channel, we must not actually switch
   // the channel here, because that would irritate the driver when we
   // start replaying in Transfer Mode immediately after switching the channel:
@@ -320,8 +341,10 @@ eSetChannelResult cDevice::SetChannel(const cChannel *Channel, bool LiveView)
   else if (!SetChannelDevice(Channel, LiveView))
      Result = scrFailed;
 
-  if (IsPrimaryDevice())
+  if (Result == scrOk && LiveView && IsPrimaryDevice()) {
      cSIProcessor::SetCurrentServiceID(Channel->pnr);
+     currentChannel = Channel->number;
+     }
 
   cStatus::MsgChannelSwitch(this, Channel->number);
 

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 1.13 2002/09/08 08:56:46 kls Exp $
+ * $Id: device.h 1.14 2002/09/08 11:17:41 kls Exp $
  */
 
 #ifndef __DEVICE_H
@@ -132,7 +132,7 @@ public:
 // Channel facilities
 
 protected:
-  int currentChannel;
+  static int currentChannel;
 public:
   virtual bool ProvidesChannel(const cChannel *Channel, int Priority = -1, bool *NeedsDetachReceivers = NULL);
          // Returns true if this device can provide the given channel.
@@ -152,6 +152,10 @@ public:
   bool SwitchChannel(const cChannel *Channel, bool LiveView);
          // Switches the device to the given Channel, initiating transfer mode
          // if necessary.
+  static bool SwitchChannel(int Direction);
+         // Switches the primary device to the next available channel in the given
+         // Direction (only the sign of Direction is evaluated, positive values
+         // switch to higher channel numbers).
 private:
   eSetChannelResult SetChannel(const cChannel *Channel, bool LiveView);
          // Sets the device to the given channel (general setup).
@@ -159,10 +163,8 @@ protected:
   virtual bool SetChannelDevice(const cChannel *Channel, bool LiveView);
          // Sets the device to the given channel (actual physical setup).
 public:
-  static int CurrentChannel(void) { return primaryDevice ? primaryDevice->currentChannel : 0; }
+  static int CurrentChannel(void) { return primaryDevice ? currentChannel : 0; }
          // Returns the number of the current channel on the primary device.
-  int Channel(void) { return currentChannel; }
-         // Returns the number of the current channel on this device.
 
 // PID handle facilities
 

eitscan.c

@@ -4,7 +4,7 @@
  * See the main source file 'vdr.c' for copyright information and
  * how to reach the author.
  *
- * $Id: eitscan.c 1.6 2002/09/04 13:32:38 kls Exp $
+ * $Id: eitscan.c 1.7 2002/09/08 11:08:52 kls Exp $
  */
 
 #include "eitscan.h"
@@ -68,7 +68,7 @@ void cEITScanner::Process(void)
                                  break;
                               if (Channel->pnr && !TransponderScanned(Channel)) {
                                  if (Device == cDevice::PrimaryDevice() && !currentChannel)
-                                    currentChannel = Device->Channel();
+                                    currentChannel = Device->CurrentChannel();
                                  Device->SwitchChannel(Channel, false);
                                  lastChannel = ch;
                                  break;

svdrp.c

@@ -10,7 +10,7 @@
  * and interact with the Video Disk Recorder - or write a full featured
  * graphical interface that sits on top of an SVDRP connection.
  *
- * $Id: svdrp.c 1.41 2002/09/04 10:49:42 kls Exp $
+ * $Id: svdrp.c 1.42 2002/09/08 11:22:57 kls Exp $
  */
 
 #include "svdrp.h"
@@ -387,6 +387,7 @@ void cSVDRP::CmdCHAN(const char *Option)
 {
   if (*Option) {
      int n = -1;
+     int d = 0;
      if (isnumber(Option)) {
         int o = strtol(Option, NULL, 10);
         if (o >= 1 && o <= Channels.MaxNumber())
@@ -394,13 +395,17 @@ void cSVDRP::CmdCHAN(const char *Option)
         }
      else if (strcmp(Option, "-") == 0) {
         n = cDevice::CurrentChannel();
-        if (n > 1)
+        if (n > 1) {
            n--;
+           d = -1;
+           }
         }
      else if (strcmp(Option, "+") == 0) {
         n = cDevice::CurrentChannel();
-        if (n < Channels.MaxNumber())
+        if (n < Channels.MaxNumber()) {
            n++;
+           d = 1;
+           }
         }
      else {
         int i = 1;
@@ -417,17 +422,21 @@ void cSVDRP::CmdCHAN(const char *Option)
         Reply(501, "Undefined channel \"%s\"", Option);
         return;
         }
-     cChannel *channel = Channels.GetByNumber(n);
-     if (channel) {
-        if (!cDevice::PrimaryDevice()->SwitchChannel(channel, true)) {
-           Reply(554, "Error switching to channel \"%d\"", channel->number);
+     if (!d) {
+        cChannel *channel = Channels.GetByNumber(n);
+        if (channel) {
+           if (!cDevice::PrimaryDevice()->SwitchChannel(channel, true)) {
+              Reply(554, "Error switching to channel \"%d\"", channel->number);
+              return;
+              }
+           }
+        else {
+           Reply(550, "Unable to find channel \"%s\"", Option);
            return;
            }
         }
-     else {
-        Reply(550, "Unable to find channel \"%s\"", Option);
-        return;
-        }
+     else
+        cDevice::SwitchChannel(d);
      }
   cChannel *channel = Channels.GetByNumber(cDevice::CurrentChannel());
   if (channel)

tools.h

@@ -4,7 +4,7 @@
  * See the main source file 'vdr.c' for copyright information and
  * how to reach the author.
  *
- * $Id: tools.h 1.49 2002/08/16 08:52:01 kls Exp $
+ * $Id: tools.h 1.50 2002/09/08 10:22:29 kls Exp $
  */
 
 #ifndef __TOOLS_H
@@ -46,6 +46,7 @@ extern int SysLogLevel;
 
 template<class T> inline T min(T a, T b) { return a <= b ? a : b; }
 template<class T> inline T max(T a, T b) { return a >= b ? a : b; }
+template<class T> inline int sgn(T a) { return a < 0 ? -1 : a > 0 ? 1 : 0; }
 template<class T> inline void swap(T &a, T &b) { T t = a; a = b; b = t; }
 
 ssize_t safe_read(int filedes, void *buffer, size_t size);

vdr.c

@@ -22,7 +22,7 @@
  *
  * The project's page is at http://www.cadsoft.de/people/kls/vdr
  *
- * $Id: vdr.c 1.121 2002/09/04 13:29:19 kls Exp $
+ * $Id: vdr.c 1.122 2002/09/08 11:19:01 kls Exp $
  */
 
 #include <getopt.h>
@@ -544,13 +544,9 @@ int main(int argc, char *argv[])
                  case kUp|k_Repeat:
                  case kUp:
                  case kDown|k_Repeat:
-                 case kDown: {
-                      int n = cDevice::CurrentChannel() + (NORMALKEY(key) == kUp ? 1 : -1);
-                      cChannel *channel = Channels.GetByNumber(n);
-                      if (channel)
-                         cDevice::PrimaryDevice()->SwitchChannel(channel, true);
+                 case kDown:
+                      cDevice::SwitchChannel(NORMALKEY(key) == kUp ? 1 : -1);
                       break;
-                      }
                  // Viewing Control:
                  case kOk:   LastChannel = -1; break; // forces channel display
                  default:    break;