add build stuff for v4l2, needs --enable-experimental until the last bits are resolved

Original commit message from CVS:
* configure.ac:
* sys/Makefile.am:
add build stuff for v4l2, needs --enable-experimental until
the last bits are resolved

ChangeLog

@@ -1,3 +1,10 @@
+2006-10-03  Thomas Vander Stichele  <thomas at apestaart dot org>
+
+	* configure.ac:
+	* sys/Makefile.am:
+	  add build stuff for v4l2, needs --enable-experimental until
+	  the last bits are resolved
+
 2006-09-29  Tim-Philipp Müller  <tim at centricular dot net>
 
 	* tests/check/Makefile.am:

configure.ac

@@ -155,6 +155,18 @@ GST_CHECK_FEATURE(EXTERNAL, [enable building of plug-ins with external deps],,
   ])
 AM_CONDITIONAL(BUILD_EXTERNAL, test "x$BUILD_EXTERNAL" = "xyes")
 
+dnl experimental plug-ins; stuff that hasn't had the dust settle yet
+GST_CHECK_FEATURE(EXPERIMENTAL, [enable building of experimental plug-ins],,
+[HAVE_EXPERIMENTAL=yes],disabled,
+[
+  AC_MSG_WARN(building experimental plug-ins)
+  USE_GST_V4L2="yes"
+],[
+  AC_MSG_NOTICE(not building experimental plug-ins)
+  USE_GST_V4L2="no"
+])
+
+
 dnl *** checks for platform ***
 
 dnl * hardware/architecture *
@@ -353,6 +365,61 @@ GST_CHECK_FEATURE(SUNAUDIO, [Sun Audio], sunaudio, [
   AC_CHECK_HEADER(sys/audioio.h, HAVE_SUNAUDIO="yes", HAVE_SUNAUDIO="no")
 ])
 
+dnl *** Video 4 Linux 2 ***
+dnl for information about the header/define, see sys/v4l2/gstv4l2element.h
+dnl renamed to GST_V4L2 because of some conflict with kernel headers
+translit(dnm, m, l) AM_CONDITIONAL(USE_GST_V4L2, true)
+GST_CHECK_FEATURE(GST_V4L2, [Video 4 Linux 2], v4l2src, [
+  AC_MSG_CHECKING([Checking for uptodate v4l2 installation])
+  AC_TRY_COMPILE([
+#include <sys/types.h>
+#include <linux/types.h>
+#define _LINUX_TIME_H
+#define __user
+#include <linux/videodev2.h>
+#if defined(V4L2_MAJOR_VERSION) || defined(V4L2_MINOR_VERSION)
+#error too early v4l2 version or no v4l2 at all
+#endif
+    ], [
+return 0;
+    ], [
+      HAVE_GST_V4L2="yes"
+      AC_MSG_RESULT(yes)
+    ], [
+      HAVE_GST_V4L2="no"
+      AC_MSG_RESULT(no)
+      AC_CHECK_HEADER(linux/videodev2.h,
+      [
+        AC_MSG_WARN([video4linux2 headers were found, but they're old.])
+        AC_MSG_WARN([Please update v4l2 to compile the v4l2 plugins])
+      ], [
+        AC_MSG_WARN([video4linux2 was not found])
+      ])
+    ])
+
+  if [ test x$HAVE_GST_V4L2 = xyes ]; then
+    dnl check for missing v4l2_buffer declaration (see #135919)
+    MISSING_DECL=0
+    AC_MSG_CHECKING(struct v4l2_buffer declaration)
+    AC_TRY_COMPILE([
+#include <sys/types.h>
+#include <linux/types.h>
+#define _LINUX_TIME_H
+#define __user
+#include <linux/videodev2.h>
+    ],[
+struct v4l2_buffer buf;
+buf.index = 0;
+return 0;
+    ], [ AC_MSG_RESULT(yes) ], [ MISSING_DECL=1 && AC_MSG_RESULT(no) ])
+    if [ test x$MISSING_DECL = x1 ]; then
+      AC_DEFINE(GST_V4L2_MISSING_BUFDECL, 1, [struct v4l2_buffer missing])
+    fi
+
+    dnl check for XOverlay libraries
+    GST_CHECK_XV
+  fi
+])
 
 dnl Check for X11
 translit(dnm, m, l) AM_CONDITIONAL(USE_X, true)
@@ -429,6 +496,13 @@ GST_CHECK_FEATURE(XSHM, [X Shared Memory extension], , [
   AC_SUBST(XSHM_LIBS)
 ])
 
+dnl for V4L2, we also need to know if we have XVIDEO
+translit(dnm, m, l) AM_CONDITIONAL(USE_XVIDEO, true)
+GST_CHECK_FEATURE(XVIDEO, [X11 XVideo extensions],
+                  [], [
+  GST_CHECK_XV
+])
+
 dnl *** ext plug-ins ***
 dnl keep this list sorted alphabetically !
 
@@ -808,6 +882,7 @@ ext/taglib/Makefile
 sys/Makefile
 sys/oss/Makefile
 sys/sunaudio/Makefile
+sys/v4l2/Makefile
 sys/ximage/Makefile
 po/Makefile.in
 tests/Makefile

sys/Makefile.am

@@ -34,11 +34,11 @@ endif
 # QCAM_DIR=
 # endif
 
-# if USE_GST_V4L2
-# V4L2_DIR=v4l2
-# else
-# V4L2_DIR=
-# endif
+if USE_GST_V4L2
+V4L2_DIR=v4l2
+else
+V4L2_DIR=
+endif
 
 # if USE_VCD
 # VCD_DIR=vcd
@@ -64,6 +64,6 @@ else
 XIMAGE_DIR=
 endif
 
-SUBDIRS=$(OSS_DIR) $(SUNAUDIO_DIR) $(XIMAGE_DIR)
+SUBDIRS=$(OSS_DIR) $(SUNAUDIO_DIR) $(V4L2_DIR) $(XIMAGE_DIR)
 
-DIST_SUBDIRS=oss sunaudio ximage
+DIST_SUBDIRS=oss sunaudio v4l2 ximage