Fixed detecting the /dev/videoN devices for GRAB in case there are others before the DVB devices

CONTRIBUTORS

@@ -568,6 +568,8 @@ Andreas Kool <akool@akool.de>
  for his help in keeping 'channels.conf.cable' up to date
  for fixing the TS to PES repacker so that it works with MPEG1 streams
  for reporting a problem with empty values in setup.conf
+ for fixing detecting the /dev/videoN devices for GRAB in case there are others
+ before the DVB devices
 
 Guy Roussin <guy.roussin@teledetection.fr>
  for suggesting not to display channel group delimiters without text

HISTORY

@@ -2411,3 +2411,5 @@ Video Disk Recorder Revision History
   to Andreas Trauer).
 - Fixed handling a channels.conf that contains a ":@nnn" line as its last entry
   (thanks to Ralf Klueber).
+- Fixed detecting the /dev/videoN devices for GRAB in case there are others
+  before the DVB devices (thanks to Andreas Kool).

dvbdevice.c

@@ -4,7 +4,7 @@
  * See the main source file 'vdr.c' for copyright information and
  * how to reach the author.
  *
- * $Id: dvbdevice.c 1.64 2003/09/06 13:19:33 kls Exp $
+ * $Id: dvbdevice.c 1.65 2003/10/04 12:31:15 kls Exp $
  */
 
 #include "dvbdevice.h"
@@ -307,6 +307,8 @@ void cDvbTuner::Action(void)
 
 // --- cDvbDevice ------------------------------------------------------------
 
+int cDvbDevice::devVideoOffset = -1;
+
 cDvbDevice::cDvbDevice(int n)
 {
   dvbTuner = NULL;
@@ -317,8 +319,7 @@ cDvbDevice::cDvbDevice(int n)
 
   // Devices that are present on all card types:
 
-  int fd_frontend = DvbOpen(DEV_DVB_FRONTEND, n, O_RDWR | O_NONBLOCK);
+  int fd_frontend = DvbOpen(DEV_DVB_FRONTEND, n, O_RDWR | O_NONBLOCK); 
-
   // Devices that are only present on cards with decoders:
 
   fd_osd      = DvbOpen(DEV_DVB_OSD,    n, O_RDWR);
@@ -329,6 +330,35 @@ cDvbDevice::cDvbDevice(int n)
 
   fd_dvr = -1;
 
+  // The offset of the /dev/video devices:
+
+  if (devVideoOffset < 0) { // the first one checks this
+     FILE *f = NULL;
+     char buffer[PATH_MAX];
+     for (int ofs = 0; ofs < 100; ofs++) {
+         snprintf(buffer, sizeof(buffer), "/proc/video/dev/video%d", ofs);
+         if ((f = fopen(buffer, "r")) != NULL) {
+            if (fgets(buffer, sizeof(buffer), f)) {
+               if (strstr(buffer, "DVB Board")) { // found the _first_ DVB card
+                  devVideoOffset = ofs;
+                  dsyslog("video device offset is %d", devVideoOffset);
+                  break;
+                  }
+               }
+            else
+               break;
+            fclose(f);
+            }
+         else
+            break;
+         }
+     if (devVideoOffset < 0)
+        devVideoOffset = 0;
+     if (f)
+        fclose(f);
+     }
+  devVideoIndex = (devVideoOffset >= 0 && HasDecoder()) ? devVideoOffset++ : -1;
+
   // Video format:
 
   SetVideoFormat(Setup.VideoFormat ? VIDEO_FORMAT_16_9 : VIDEO_FORMAT_4_3);
@@ -427,8 +457,10 @@ cSpuDecoder *cDvbDevice::GetSpuDecoder(void)
 
 bool cDvbDevice::GrabImage(const char *FileName, bool Jpeg, int Quality, int SizeX, int SizeY)
 {
+  if (devVideoIndex < 0)
+     return false;
   char buffer[PATH_MAX];
-  snprintf(buffer, sizeof(buffer), "%s%d", DEV_VIDEO, CardIndex());
+  snprintf(buffer, sizeof(buffer), "%s%d", DEV_VIDEO, devVideoIndex);
   int videoDev = open(buffer, O_RDWR);
   if (videoDev < 0)
      LOG_ERROR_STR(buffer);

dvbdevice.h

@@ -4,7 +4,7 @@
  * See the main source file 'vdr.c' for copyright information and
  * how to reach the author.
  *
- * $Id: dvbdevice.h 1.22 2003/08/15 12:34:55 kls Exp $
+ * $Id: dvbdevice.h 1.23 2003/10/04 11:54:50 kls Exp $
  */
 
 #ifndef __DVBDEVICE_H
@@ -73,6 +73,9 @@ protected:
 
 // Image Grab facilities
 
+private:
+  static int devVideoOffset;
+  int devVideoIndex;
 public:
   virtual bool GrabImage(const char *FileName, bool Jpeg = true, int Quality = -1, int SizeX = -1, int SizeY = -1);