[MPC-HC] Version number: Add a "git describe based" commit number to identify the vanilla LAV Filters we are based on.mpc-hc-1.7.2-5

This way if we distribute LAV Filters version X.Y.Z.N, it means that our custom build is based on:
 - the stable version X.Y.Z,
 - with N official patches (which will be part of next official LAV Filters build),
 - and some custom non-official patches which are here to improve the integration in MPC-HC.

5 files changed, 128 insertions, 2 deletions

diff --git a/.gitignore b/.gitignore
index ec0cbbde..c49d601f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,3 +7,5 @@
 
 /ipch
 /bin_*
+
+/common/includes/version_rev.h
diff --git a/common/DSUtilLite/DSUtilLite.vcxproj b/common/DSUtilLite/DSUtilLite.vcxproj
index c6552b91..08f1acf9 100644
--- a/common/DSUtilLite/DSUtilLite.vcxproj
+++ b/common/DSUtilLite/DSUtilLite.vcxproj
@@ -62,11 +62,17 @@
     <ClCompile>
       <PreprocessorDefinitions>WIN32;_DEBUG;_LIB;%(PreprocessorDefinitions)</PreprocessorDefinitions>
     </ClCompile>
+    <PreBuildEvent>
+      <Command>..\..\update_version.bat</Command>
+    </PreBuildEvent>
   </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)'=='Release'">
     <ClCompile>
       <PreprocessorDefinitions>WIN32;NDEBUG;_LIB;%(PreprocessorDefinitions)</PreprocessorDefinitions>
     </ClCompile>
+    <PreBuildEvent>
+      <Command>..\..\update_version.bat</Command>
+    </PreBuildEvent>
   </ItemDefinitionGroup>
   <ItemGroup>
     <ClInclude Include="BaseDSPropPage.h" />
diff --git a/common/includes/version.h b/common/includes/version.h
index eb880a35..8ab23651 100644
--- a/common/includes/version.h
+++ b/common/includes/version.h
@@ -8,6 +8,8 @@
 #define LAV_VIDEO "LAV Video Decoder"
 #define LAV_SPLITTER "LAV Splitter"
 
+#include "version_rev.h"
+
 /////////////////////////////////////////////////////////
 #ifndef ISPP_INCLUDED
 
@@ -24,8 +26,8 @@
 #define DO_MAKE_STR(x) #x
 #define MAKE_STR(x) DO_MAKE_STR(x)
 
-#define LAV_VERSION LAV_VERSION_MAJOR.LAV_VERSION_MINOR.LAV_VERSION_REVISION
-#define LAV_VERSION_TAG LAV_VERSION_MAJOR, LAV_VERSION_MINOR, LAV_VERSION_REVISION
+#define LAV_VERSION LAV_VERSION_MAJOR.LAV_VERSION_MINOR.LAV_VERSION_REVISION.LAV_VERSION_COMMIT_NUM
+#define LAV_VERSION_TAG LAV_VERSION_MAJOR, LAV_VERSION_MINOR, LAV_VERSION_REVISION, LAV_VERSION_COMMIT_NUM
 
 #define LAV_VERSION_STR MAKE_STR(LAV_VERSION)
 
diff --git a/update_version.bat b/update_version.bat
new file mode 100644
index 00000000..1508e72c
--- /dev/null
+++ b/update_version.bat
@@ -0,0 +1,49 @@
+@ECHO OFF
+REM (C) 2013 see Authors.txt
+REM
+REM This file is part of MPC-HC.
+REM
+REM MPC-HC is free software; you can redistribute it and/or modify
+REM it under the terms of the GNU General Public License as published by
+REM the Free Software Foundation; either version 3 of the License, or
+REM (at your option) any later version.
+REM
+REM MPC-HC is distributed in the hope that it will be useful,
+REM but WITHOUT ANY WARRANTY; without even the implied warranty of
+REM MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+REM GNU General Public License for more details.
+REM
+REM You should have received a copy of the GNU General Public License
+REM along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+
+SETLOCAL
+
+PUSHD %~dp0
+
+IF EXIST "..\..\..\..\build.user.bat" (
+  CALL "..\..\..\..\build.user.bat"
+) ELSE (
+  IF DEFINED GIT  (SET MPCHC_GIT=%GIT%)
+  IF DEFINED MSYS (SET MPCHC_MSYS=%MSYS%) ELSE (GOTO MissingVar)
+)
+
+SET PATH=%MPCHC_MSYS%\bin;%MPCHC_GIT%\cmd;%PATH%
+FOR %%G IN (bash.exe) DO (SET FOUND=%%~$PATH:G)
+IF NOT DEFINED FOUND GOTO MissingVar
+
+bash.exe ./version.sh
+
+
+:END
+POPD
+ENDLOCAL
+EXIT /B
+
+
+:MissingVar
+ECHO Not all build dependencies were found.
+ECHO.
+ECHO See "..\..\..\..\docs\Compilation.txt" for more information.
+ENDLOCAL
+EXIT /B 1
diff --git a/version.sh b/version.sh
new file mode 100644
index 00000000..57fd0870
--- /dev/null
+++ b/version.sh
@@ -0,0 +1,67 @@
+#!/bin/bash
+# (C) 2013 see Authors.txt
+#
+# This file is part of MPC-HC.
+#
+# MPC-HC is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# MPC-HC is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+versionfile_fixed="./common/includes/version.h"
+versionfile="./common/includes/version_rev.h"
+
+# Read major, minor and patch version numbers from static version.h file
+while read -r _ var value; do
+  if [[ $var == LAV_VERSION_MAJOR ]]; then
+    ver_fixed_major=$value
+  elif [[ $var == LAV_VERSION_MINOR ]]; then
+    ver_fixed_minor=$value
+  elif [[ $var == LAV_VERSION_REVISION ]]; then
+    ver_fixed_patch=$value
+  fi
+done < "$versionfile_fixed"
+ver_fixed="${ver_fixed_major}.${ver_fixed_minor}.${ver_fixed_patch}"
+echo "Version:   $ver_fixed"
+
+# If we are not inside a git repo use hardcoded values
+if ! git rev-parse --git-dir > /dev/null 2>&1; then
+  hash=0000000
+  ver=0
+  ver_additional=
+  echo "Warning: Git not available or not a git repo. Using dummy values for hash and version number."
+else
+  # Get information about the current version
+  describe=$(git describe --long `git log --grep="\[MPC-HC\] Use our own ffmpeg clone repository\." --pretty=%H`~1)
+  echo "Describe:  $describe"
+
+  # Get the abbreviated hash of the current changeset
+  hash=${describe##*-g}
+
+  # Get the number changesets since the last tag
+  ver=${describe#*-}
+  ver=${ver%-*}
+
+  echo "Hash:      $hash"
+  if ! git diff-index --quiet HEAD; then
+    echo "Revision:  $ver (Local modifications found)"
+  else
+    echo "Revision:  $ver"
+  fi
+fi
+
+version_info+="#define LAV_VERSION_COMMIT_NUM $ver"$'\n'
+
+# Update version_rev.h if it does not exist, or if version information was changed.
+if [[ ! -f "$versionfile" ]] || [[ "$version_info" != "$(<"$versionfile")" ]]; then
+  # Write the version information to version_rev.h
+  echo "$version_info" > "$versionfile"
+fi