fix build on debian testing

Debian Testing doesn't use the contribs, so bump down the FFmpeg
requirements in the configure.ac as well as making RING_ACCEL dependant
on a certain version of libavutil.

Reviewed-by: Alexandre Viau <alexandre.viau@savoirfairelinux.com>
Change-Id: I1f9d0de44e5f9d0bbb69b20d73a396de7e5d64b4

configure.ac

@@ -425,16 +425,16 @@ AS_IF([test "x$with_restcpp" = "xyes"], [
 );
 
 dnl Check for libav
-PKG_CHECK_MODULES(LIBAVUTIL, libavutil >= 55.75.100,, AC_MSG_ERROR([Missing libavutil development files]))
+PKG_CHECK_MODULES(LIBAVUTIL, libavutil >= 54.31.100,, AC_MSG_ERROR([Missing libavutil development files]))
 
-PKG_CHECK_MODULES(LIBAVCODEC, libavcodec >= 53.106.101,, AC_MSG_ERROR([Missing libavcodec development files]))
+PKG_CHECK_MODULES(LIBAVCODEC, libavcodec >= 56.60.100,, AC_MSG_ERROR([Missing libavcodec development files]))
 LIBAVCODEC_CFLAGS="${LIBAVCODEC_CFLAGS} -D__STDC_CONSTANT_MACROS"
 
-PKG_CHECK_MODULES(LIBAVFORMAT, libavformat >= 57.81.100,, AC_MSG_ERROR([Missing libavformat development files]))
+PKG_CHECK_MODULES(LIBAVFORMAT, libavformat >= 56.40.101,, AC_MSG_ERROR([Missing libavformat development files]))
 
-PKG_CHECK_MODULES(LIBAVDEVICE, libavdevice >= 57.8.101,, AC_MSG_ERROR([Missing libavdevice development files]))
+PKG_CHECK_MODULES(LIBAVDEVICE, libavdevice >= 56.4.100,, AC_MSG_ERROR([Missing libavdevice development files]))
 
-PKG_CHECK_MODULES(LIBSWSCALE, libswscale >= 4.7.103,, AC_MSG_ERROR([Missing libswscale development files]))
+PKG_CHECK_MODULES(LIBSWSCALE, libswscale >= 3.1.101,, AC_MSG_ERROR([Missing libswscale development files]))
 
 dnl Video is default-enabled
 AC_ARG_ENABLE([video], AS_HELP_STRING([--disable-video], [Disable video]))
@@ -454,6 +454,9 @@ AS_IF([test "x$enable_video" != "xno"],
 
 AC_ARG_ENABLE([accel], AS_HELP_STRING([--disable-accel], [Disable all hardware accelerations (enabled by default)]))
 AS_IF([test "x$enable_video" != "xno" -a "x$enable_accel" != "xno"], [
+  dnl if new hwaccel api is found, activate Ring's hardware accel
+  dnl prefix needs to be different from the one above
+  PKG_CHECK_MODULES(AVUTIL, libavutil >= 55.75.100, [
     ring_accel="yes"
     AC_DEFINE([RING_ACCEL], [1], [Hardware acceleration is enabled in Ring])
     AS_IF([test "${SYS}" = "linux" && test -z "${HAVE_ANDROID_FALSE}"], [
@@ -488,6 +491,7 @@ AS_IF([test "x$enable_video" != "xno" -a "x$enable_accel" != "xno"], [
         ])
       ])
     ])
+  ],[AC_MSG_NOTICE([HWAccel API not found])])
 ])
 AM_CONDITIONAL([RING_ACCEL], [test "x${ring_accel}" = "xyes"])
 AM_CONDITIONAL([RING_VAAPI], [test "x${ring_vaapi}" = "xyes"])