sox, ffmpeg_svn expressions added

ghcPkgUtil defines a function to create setup-hook 
- creating a packagedatabase (nix-support/package.conf)
- adding it to GHC_PACKAGE_PATH
see comments for details

svn path=/nixpkgs/trunk/; revision=9500

pkgs/development/libraries/ffmpeg_svn_snapshot/default.nix

@@ -0,0 +1,11 @@
+{stdenv, fetchurl}:
+
+stdenv.mkDerivation {
+  name = "ffmpeg-svn";
+  src = fetchurl {
+    url = http://ffmpeg.mplayerhq.hu/ffmpeg-export-snapshot.tar.bz2;
+    sha256 = "040a35f0c004323af14329c09ad3cff8d040e2cf9797d97cde3d9d83d02b4d87";
+  };
+  # !!! Hm, what are the legal consequences of --enable-gpl?
+  configureFlags = "--enable-shared --enable-pp --enable-gpl --disable-ffserver --disable-ffplay";
+}

pkgs/development/libraries/haskell/generic/ghcPkgUtil.sh

@@ -0,0 +1,33 @@
+# mantainer: Marc Weber (marco-oweber@gmx.de)
+#
+# example usage: add ghcPkgUtil to buildInputs then somewhere in buildPhase:
+#
+#  createEmptyPackageDatabaseAndSetupHook
+#  configure --with-package-db=$PACKAGE_DB
+#  ... compile ghc library ...
+# add your library to propagatedBuildInputs instead of buildInputs 
+# in all depending libraries
+
+
+
+# creates a setup hook
+# adding the package database 
+# nix-support/package.conf to GHC_PACKAGE_PATH
+# if not already contained
+setupHookRegisteringPackageDatabase(){
+  ensureDir $out/nix-support;
+  local pkgdb=$out/nix-support/package.conf
+  cat >> $out/nix-support/setup-hook << EOF
+    
+    echo \$GHC_PACKAGE_PATH | grep -l $pkgdb &> /dev/null || \
+      export GHC_PACKAGE_PATH=\$GHC_PACKAGE_PATH\${GHC_PACKAGE_PATH:+$PATH_DELIMITER}$pkgdb;
+EOF
+}
+
+# create an empty package database in which the new library can be registered. 
+createEmptyPackageDatabaseAndSetupHook(){
+  ensureDir $out/nix-support;
+  PACKAGE_DB=$out/nix-support/package.conf;
+  echo '[]' > $PACKAGE_DB";
+  setupHookRegisteringPackageDatabase
+}

pkgs/development/libraries/libsamplerate/default.nix

@@ -0,0 +1,35 @@
+args:
+( args.mkDerivationByConfigruation {
+    flagConfig = {
+      mandatory = { buildInputs = ["pkgconfig"];};
+    # are these options of interest? We'll see
+    #--disable-fftw          disable usage of FFTW
+    #--enable-debug          enable debugging
+    #--disable-cpu-clip      disable tricky cpu specific clipper
+
+    }; 
+
+    extraAttrs = co : {
+      name = "libsamplerate-0.1.2";
+
+      src = args.fetchurl {
+        url = http://www.mega-nerd.com/SRC/libsamplerate-0.1.2.tar.gz;
+        sha256 = "1m1iwzpcny42kcqv5as2nyb0ggrb56wzckpximqpp2y74dipdf4q";
+      };
+
+    configurePhase = "
+     export LIBSAMPLERATE_CFLAGS=\"-I \$libsamplerate/include\"
+     export LIBSAMPLERATE_LIBS=\"-L \$libsamplerate/libs\"
+     ./configure --prefix=\$out"+co.configureFlags;
+
+    meta = { 
+      description = "Sample Rate Converter for audio";
+      homepage = http://www.mega-nerd.com/SRC/index.html;
+      # you can choose one of the following licenses: 
+      license = [ "GPL" 
+                  { url=http://www.mega-nerd.com/SRC/libsamplerate-cul.pdf; 
+                    name="libsamplerate Commercial Use License";
+                  } ];
+    };
+  };
+} ) args