Implemented image grabbing

CONTRIBUTORS

@@ -19,6 +19,7 @@ Heino Goldenstein <heino.goldenstein@microplex.de>
 Guido Fiala <gfiala@s.netic.de>
  for implementing slow forward/back
  for implementing the SVDRP command 'HITK'
+ for implementing image grabbing
 
 Robert Schneider <Robert.Schneider@lotus.com>
  for implementing EIT support for displaying the current/next info

HISTORY

@@ -182,7 +182,8 @@ Video Disk Recorder Revision History
   response time on user actions. As a consequence the EIT data may sometimes
   not be displayed, but this will change later when cEIT runs as a separate
   thread.
-- The new SVDRP command 'HITK' can be used to 'hit' a remote control key.
-  Establish an SVDRP connection and enter HITK without a parameter for a list
-  of all valid key names.
-
+- The new SVDRP command 'HITK' (thanks to Guido Fiala!) can be used to 'hit'
+  a remote control key.  Establish an SVDRP connection and enter HITK without
+  a parameter for a list of all valid key names.
+- The new SVDRP command 'GRAB' (thanks to Guido Fiala!) can be used to grab
+  the current frame and save it to a file.

Makefile

@@ -4,7 +4,7 @@
 # See the main source file 'vdr.c' for copyright information and
 # how to reach the author.
 #
-# $Id: Makefile 1.9 2000/09/10 08:55:45 kls Exp $
+# $Id: Makefile 1.10 2000/09/17 10:19:44 kls Exp $
 
 DVBDIR   = ../DVB
 
@@ -40,7 +40,7 @@ tools.o    : tools.c tools.h
 videodir.o : videodir.c tools.h videodir.h
 
 vdr: $(OBJS)
-	g++ -g -O2 $(OBJS) -lncurses -o vdr
+	g++ -g -O2 $(OBJS) -lncurses -ljpeg -o vdr
 
 clean:
 	-rm $(OBJS) vdr

dvbapi.c

@@ -4,14 +4,18 @@
  * See the main source file 'vdr.c' for copyright information and
  * how to reach the author.
  *
- * $Id: dvbapi.c 1.25 2000/09/15 13:23:00 kls Exp $
+ * $Id: dvbapi.c 1.26 2000/09/17 11:53:35 kls Exp $
  */
 
 #include "dvbapi.h"
 #include <errno.h>
 #include <fcntl.h>
+extern "C" {
+#include <jpeglib.h>
+}
 #include <stdlib.h>
 #include <sys/ioctl.h>
+#include <sys/mman.h>
 #include <sys/stat.h>
 #include <sys/time.h>
 #include <unistd.h>
@@ -1067,7 +1071,7 @@ cDvbApi::cDvbApi(const char *FileName)
   cols = rows = 0;
 #if defined(DEBUG_OSD) || defined(REMOTE_KBD)
   initscr();
-  keypad(stdscr, TRUE);
+  keypad(stdscr, true);
   nonl();
   cbreak();
   noecho();
@@ -1076,7 +1080,7 @@ cDvbApi::cDvbApi(const char *FileName)
 #if defined(DEBUG_OSD)
   memset(&colorPairs, 0, sizeof(colorPairs));
   start_color();
-  leaveok(stdscr, TRUE);
+  leaveok(stdscr, true);
   window = NULL;
 #endif
   lastProgress = lastTotal = -1;
@@ -1187,6 +1191,93 @@ void cDvbApi::Cleanup(void)
   PrimaryDvbApi = NULL;
 }
 
+bool cDvbApi::GrabImage(const char *FileName, bool Jpeg, int Quality, int SizeX, int SizeY)
+{
+  int result = 0;
+  // just do this once?
+  struct video_mbuf mbuf;
+  result |= ioctl(videoDev, VIDIOCGMBUF, &mbuf);
+  int msize = mbuf.size;
+  // gf: this needs to be a protected member of cDvbApi! //XXX kls: WHY???
+  unsigned char *mem = (unsigned char *)mmap(0, msize, PROT_READ | PROT_WRITE, MAP_SHARED, videoDev, 0);
+  if (!mem || mem == (unsigned char *)-1)
+     return false;
+  // set up the size and RGB
+  struct video_capability vc;
+  result |= ioctl(videoDev, VIDIOCGCAP, &vc);
+  struct video_mmap vm;
+  vm.frame = 0;
+  if ((SizeX > 0) && (SizeX <= vc.maxwidth) &&
+      (SizeY > 0) && (SizeY <= vc.maxheight)) {
+     vm.width = SizeX;
+     vm.height = SizeY;
+     }
+  else {
+     vm.width = vc.maxwidth;
+     vm.height = vc.maxheight;
+     }
+  vm.format = VIDEO_PALETTE_RGB24;
+  // this needs to be done every time:
+  result |= ioctl(videoDev, VIDIOCMCAPTURE, &vm);
+  result |= ioctl(videoDev, VIDIOCSYNC, &vm.frame);
+  // make RGB out of BGR:
+  int memsize = vm.width * vm.height;
+  unsigned char *mem1 = mem;
+  for (int i = 0; i < memsize; i++) {
+      unsigned char tmp = mem1[2];
+      mem1[2] = mem1[0];
+      mem1[0] = tmp;
+      mem1 += 3;
+      }
+
+  if (Quality < 0)
+     Quality = 255; //XXX is this 'best'???
+
+  isyslog(LOG_INFO, "grabbing to %s (%s %d %d %d)", FileName, Jpeg ? "JPEG" : "PNM", Quality, vm.width, vm.height);
+  FILE *f = fopen(FileName, "wb");
+  if (f) {
+     if (Jpeg) {
+        // write JPEG file:
+        struct jpeg_compress_struct cinfo;
+        struct jpeg_error_mgr jerr;
+        cinfo.err = jpeg_std_error(&jerr);
+        jpeg_create_compress(&cinfo);
+        jpeg_stdio_dest(&cinfo, f);
+        cinfo.image_width = vm.width;
+        cinfo.image_height = vm.height;
+        cinfo.input_components = 3;
+        cinfo.in_color_space = JCS_RGB;
+
+        jpeg_set_defaults(&cinfo);
+        jpeg_set_quality(&cinfo, Quality, true);
+        jpeg_start_compress(&cinfo, true);
+
+        int rs = vm.width * 3;
+        JSAMPROW rp[vm.height];
+        for (int k = 0; k < vm.height; k++)
+            rp[k] = &mem[rs * k];
+        jpeg_write_scanlines(&cinfo, rp, vm.height);
+        jpeg_finish_compress(&cinfo);
+        jpeg_destroy_compress(&cinfo);
+        }
+     else {
+        // write PNM file:
+        if (fprintf(f, "P6\n%d\n%d\n255\n", vm.width, vm.height) < 0 ||
+            fwrite(mem, vm.width * vm.height * 3, 1, f) < 0) {
+           LOG_ERROR_STR(FileName);
+           result |= 1;
+           }
+        }
+     fclose(f);
+     }
+  else {
+     LOG_ERROR_STR(FileName);
+     result |= 1;
+     }
+  munmap(mem, msize);
+  return result == 0;
+}
+
 #ifdef DEBUG_OSD
 void cDvbApi::SetColor(eDvbColor colorFg, eDvbColor colorBg)
 {
@@ -1233,7 +1324,7 @@ void cDvbApi::Open(int w, int h)
   rows = h;
 #ifdef DEBUG_OSD
   window = subwin(stdscr, h, w, d, 0);
-  syncok(window, TRUE);
+  syncok(window, true);
   #define B2C(b) (((b) * 1000) / 255)
   #define SETCOLOR(n, r, g, b, o) init_color(n, B2C(r), B2C(g), B2C(b))
 #else

dvbapi.h

@@ -4,7 +4,7 @@
  * See the main source file 'vdr.c' for copyright information and
  * how to reach the author.
  *
- * $Id: dvbapi.h 1.14 2000/09/10 10:03:29 kls Exp $
+ * $Id: dvbapi.h 1.15 2000/09/17 11:43:10 kls Exp $
  */
 
 #ifndef __DVBAPI_H
@@ -70,6 +70,10 @@ public:
          // Closes down all DVB devices.
          // Must be called at the end of the program.
 
+  // Image Grab facilities
+
+  bool GrabImage(const char *FileName, bool Jpeg = true, int Quality = -1, int SizeX = -1, int SizeY = -1);
+
   // On Screen Display facilities
 
 private:

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 1.8 2000/09/17 09:24:52 kls Exp $
+ * $Id: svdrp.c 1.9 2000/09/17 11:29:33 kls Exp $
  */
 
 #define _GNU_SOURCE
@@ -120,6 +120,10 @@ const char *HelpPages[] = {
   "    Delete channel.",
   "DELT <number>\n"
   "    Delete timer.",
+  "GRAB <filename> [ jpeg | pnm [ <quality> [ <sizex> <sizey> ] ] ]\n"
+  "    Grab the current frame and save it to the given file. Images can\n"
+  "    be stored as JPEG (default) or PNM, at the given quality (default\n"
+  "    is 'maximum', only applies to JPEG) and size (default is full screen).",
   "HELP [ <topic> ]\n"
   "    The HELP command gives help info.",
   "HITK [ <key> ]\n"
@@ -363,6 +367,67 @@ void cSVDRP::CmdDELT(const char *Option)
      Reply(501, "Missing timer number");
 }
 
+void cSVDRP::CmdGRAB(const char *Option)
+{
+  char *FileName = NULL;
+  bool Jpeg = true;
+  int Quality = -1, SizeX = -1, SizeY = -1;
+  if (*Option) {
+     char buf[strlen(Option) + 1];
+     char *p = strcpy(buf, Option);
+     const char *delim = " \t";
+     FileName = strtok(p, delim);
+     if ((p = strtok(NULL, delim)) != NULL) {
+        if (strcasecmp(p, "JPEG") == 0)
+           Jpeg = true;
+        else if (strcasecmp(p, "PNM") == 0)
+           Jpeg = false;
+        else {
+           Reply(501, "Unknown image type \"%s\"", p);
+           return;
+           }
+        }
+     if ((p = strtok(NULL, delim)) != NULL) {
+        if (isnumber(p))
+           Quality = atoi(p);
+        else {
+           Reply(501, "Illegal quality \"%s\"", p);
+           return;
+           }
+        }
+     if ((p = strtok(NULL, delim)) != NULL) {
+        if (isnumber(p))
+           SizeX = atoi(p);
+        else {
+           Reply(501, "Illegal sizex \"%s\"", p);
+           return;
+           }
+        if ((p = strtok(NULL, delim)) != NULL) {
+           if (isnumber(p))
+              SizeY = atoi(p);
+           else {
+              Reply(501, "Illegal sizey \"%s\"", p);
+              return;
+              }
+           }
+        else {
+           Reply(501, "Missing sizey");
+           return;
+           }
+        }
+     if ((p = strtok(NULL, delim)) != NULL) {
+        Reply(501, "Unexpected parameter \"%s\"", p);
+        return;
+        }
+     if (cDvbApi::PrimaryDvbApi->GrabImage(FileName, Jpeg, Quality, SizeX, SizeY))
+        Reply(250, "Grabbed image %s", Option);
+     else
+        Reply(451, "Grab image failed");
+     }
+  else
+     Reply(501, "Missing filename");
+}
+
 void cSVDRP::CmdHELP(const char *Option)
 {
   if (*Option) {
@@ -636,6 +701,7 @@ void cSVDRP::Execute(char *Cmd)
   if      (CMD("CHAN"))  CmdCHAN(s);
   else if (CMD("DELC"))  CmdDELC(s);
   else if (CMD("DELT"))  CmdDELT(s);
+  else if (CMD("GRAB"))  CmdGRAB(s);
   else if (CMD("HELP"))  CmdHELP(s);
   else if (CMD("HITK"))  CmdHITK(s);
   else if (CMD("LSTC"))  CmdLSTC(s);

svdrp.h

@@ -4,7 +4,7 @@
  * See the main source file 'vdr.c' for copyright information and
  * how to reach the author.
  *
- * $Id: svdrp.h 1.4 2000/09/17 08:52:51 kls Exp $
+ * $Id: svdrp.h 1.5 2000/09/17 10:22:49 kls Exp $
  */
 
 #ifndef __SVDRP_H
@@ -35,6 +35,7 @@ private:
   void CmdCHAN(const char *Option);
   void CmdDELC(const char *Option);
   void CmdDELT(const char *Option);
+  void CmdGRAB(const char *Option);
   void CmdHELP(const char *Option);
   void CmdHITK(const char *Option);
   void CmdLSTC(const char *Option);