# For libmpeg3 v1.7
#
# 1) make libmpeg3.so
# 2) make libmpeg3.pc for pkg-config
# 3) can use shared liba52 if exists (with 'configure --enable-shared-liba52)
# 4) 'make install' with option DESTDIR
# 5) 'configure' more standard (--prefix, --bindir, --libdir, --help, etc..)
#
# Example for 64 bit (internal liba52):
#    configure --prefix=/usr --libdir=/usr/lib64 && make && make install DESTDIR=/tmp/package-libmpeg3
#
# Example for 64 bit (shared liba52):
#    configure --prefix=/usr --libdir=/usr/lib64 --enable-shared-liba52 && make && make install DESTDIR=/tmp/package-libmpeg3
#
# Example for 32 bit (internal liba52):
#    configure --prefix=/usr && make && make install DESTDIR=/tmp/package-libmpeg3
#
# Example for 32 bit (shared liba52):
#    configure --prefix=/usr --enable-shared-liba52 && make && make install DESTDIR=/tmp/package-libmpeg3
#
# by spina <spina80@freemail.it>

--- configure	2005-08-31 04:02:31.000000000 +0000
+++ configure.new	2008-03-01 09:05:39.000000000 +0000
@@ -16,17 +16,95 @@
 
 	if [ $HAVE_NASM == n ]; 
 	then echo " *** Nasm is required.  Download it from nasm.sourceforge.net"; 
-	ERROR=1
+	exit
 	fi
 
 fi
 
+## init Spina
+shared_liba52="no"
+PREFIX=""
+BINDIR=""
+DEST_LIB_DIR=""
+INCLUDEDIR=""
+A52_SHARED=""
+
+for option 
+do
+  case $option in
+    --bindir*)
+      BINDIR=`echo $option | cut -d'=' -f2`;;
+
+    --libdir*)
+      DEST_LIB_DIR=`echo $option | cut -d'=' -f2`;;
+
+    --includedir*)
+      INCLUDEDIR=`echo $option | cut -d'=' -f2`;;
+
+#   Use shared liba52 if exists
+    --enable-shared-liba52) shared_liba52="yes";;
+
+    --prefix*)
+      PREFIX=`echo $option | cut -d'=' -f2`;;
+
+    -h | --help)
+      cat <<EOF
+'configure' configures libmpeg3 1.7 to adapt to many kinds of systems.
+
+Usage: ./configure [OPTION]... [VAR=VALUE]...
+
+Defaults for the options are specified in brackets.
+
+Configuration:
+  -h, --help              display this help and exit
+
+Installation directories:
+  --prefix=PREFIX         install architecture-independent files in PREFIX
+                          [/usr/local]
+
+Fine tuning of the installation directories:
+  --bindir=DIR           user executables [PREFIX/bin]
+  --libdir=DIR           object code libraries [PREFIX/lib]
+  --includedir=DIR       C header files [PREFIX/include]
+
+Optional Features:
+  --enable-shared-liba52         use shared liba52 if exists (use static)
+EOF
+      exit;
+  esac
+done
+
+if test "x"$shared_liba52 = "xyes"
+  then
+    # liba52 is shared
+    cat > a52_test.c <<EOF
+int main()
+{
+  a52_init(0);
+}
+EOF
+
+    if gcc -la52 a52_test.c -o a52_test; then
+      A52_SHARED="yes"
+    fi
 
+    rm a52_test.c a52_test &>/dev/null
+fi
+
+
+sed "3a\
+PREFIX = $PREFIX\n\
+BINDIR = $BINDIR\n\
+DEST_LIB_DIR = $DEST_LIB_DIR\n\
+INCLUDEDIR = $INCLUDEDIR\n\
+A52_SHARED = $A52_SHARED
+" Makefile > Makefile.new
+
+mv Makefile.new Makefile;
+
+## end Spina
 
 # success
 if [ $ERROR == 0 ];
 then echo "Configured successfully.  Type 'make' to build it.";
 fi
-
-
-
--- Makefile	2006-02-15 05:09:31.000000000 +0000
+++ Makefile.new	2008-03-01 09:14:27.000000000 +0000
@@ -4,9 +4,24 @@
 USE_CSS = 1
 A52DIR := $(shell expr a52dec* )
 
+ifeq ("$(A52_SHARED)", "")
+A52_SHARED=no
+endif
 
 ifeq ("$(PREFIX)", "")
-PREFIX=/usr
+PREFIX = /usr/local
+endif
+
+ifeq ("$(BINDIR)", "")
+BINDIR = $(PREFIX)/bin
+endif
+
+ifeq ("$(DEST_LIB_DIR)", "")
+DEST_LIB_DIR = $(PREFIX)/lib
+endif
+
+ifeq ("$(INCLUDEDIR)", "")
+INCLUDEDIR = $(PREFIX)/include
 endif
 
 ifeq ($(origin CFLAGS), environment)
@@ -15,12 +30,8 @@
 HAVE_CFLAGS := n
 endif
 
-
 OBJDIR := $(shell uname --machine)
 
-
-
-
 ifeq ($(OBJDIR), alpha)
   USE_MMX = 0
   ifneq ($(HAVE_CFLAGS), y)
@@ -31,22 +42,18 @@
 ifeq ($(OBJDIR), i686)
   USE_MMX = 1
   ifneq ($(HAVE_CFLAGS), y)
-    CFLAGS := -O2 -fomit-frame-pointer -falign-loops=2 -falign-jumps=2 -falign-functions=2 -I/usr/local/include
+    CFLAGS := -fPIC -O2 -fomit-frame-pointer -falign-loops=2 -falign-jumps=2 -falign-functions=2 -I/usr/local/include
   endif
   CFLAGS += -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
 endif
 
 ifeq ($(OBJDIR), x86_64)
   ifneq ($(HAVE_CFLAGS), y)
-    CFLAGS := -O2 -fomit-frame-pointer -I/usr/local/include
+    CFLAGS := -fPIC -O2 -fomit-frame-pointer -I/usr/local/include
   endif
   CFLAGS += -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
-
-
 endif
 
-
-
 ifeq ($(USE_CSS), 1)
   CFLAGS += -DHAVE_CSS
 endif
@@ -57,29 +64,13 @@
   NASMOBJS = $(OBJDIR)/video/reconmmx.o
 endif
 
-
-
-
-
-
 CFLAGS += \
 	-I. \
 	-I$(A52DIR)/include \
 	-I$(A52DIR)/liba52
 
-
-
 CFLAGS += -g
 
-
-
-
-
-
-
-
-
-
 OBJS = \
 	$(OBJDIR)/audio/ac3.o \
 	$(OBJDIR)/audio/dct.o \
@@ -117,52 +108,51 @@
 	$(OBJDIR)/video/vlc.o \
 	$(OBJDIR)/workarounds.o
 
-#OBJS = \
-#	$(OBJDIR)/audio/ac3.o \
-#	$(OBJDIR)/audio/bit_allocation.o \
-#	$(OBJDIR)/audio/exponents.o \
-#	$(OBJDIR)/audio/header.o \
-#	$(OBJDIR)/audio/huffman.o \
-#	$(OBJDIR)/audio/layer2.o \
-#	$(OBJDIR)/audio/layer3.o \
-#	$(OBJDIR)/audio/mantissa.o \
-#	$(OBJDIR)/audio/pcm.o \
-#	$(OBJDIR)/audio/tables.o \
-
-
-
-
 DIRS := \
 	$(OBJDIR)/audio \
 	$(OBJDIR)/video
 
+ifeq ("$(A52_SHARED)", "no")
 include Makefile.a52
 
 DIRS += $(A52DIRS)
-
+endif
 
 OUTPUT = $(OBJDIR)/libmpeg3.a
 UTILS = $(OBJDIR)/mpeg3dump $(OBJDIR)/mpeg3peek $(OBJDIR)/mpeg3toc  $(OBJDIR)/mpeg3cat
 
-#$(OBJDIR)/mpeg3split
+SHARED = $(OBJDIR)/libmpeg3.so
 
+PKG_CONFIG_FILE=$(OBJDIR)/libmpeg3.pc
 
-LIBS = -lm -lpthread
+ifeq ("$(A52_SHARED)", "no")
+LIBS = -lm -lpthread 
+else
+LIBS = -lm -lpthread -la52
+endif
 
-$(shell if ! test -d $(OBJDIR) \; then mkdir -p $(OBJDIR) \; fi )
+$(shell if ! test -d $(OBJDIR); then mkdir -p $(OBJDIR); fi )
 
 $(shell echo $(CFLAGS) > $(OBJDIR)/c_flags)
+
+ifeq ("$(A52_SHARED)", "no")
 $(shell echo $(A52CFLAGS) > $(OBJDIR)/a52_flags)
+endif
+
 $(shell echo $(OBJS) $(ASMOBJS) $(A52OBJS) $(NASMOBJS) > $(OBJDIR)/objs)
 $(shell mkdir -p $(DIRS) )
 
-all: $(OUTPUT) $(UTILS)
-
+all: $(OUTPUT) $(PKG_CONFIG_FILE) $(SHARED) $(UTILS)
 
 $(OUTPUT): $(OBJS) $(ASMOBJS) $(NASMOBJS) $(A52OBJS)
 	ar rcs $(OUTPUT) `cat $(OBJDIR)/objs`
 
-
+$(SHARED): $(OBJS) $(ASMOBJS) $(NASMOBJS) $(A52OBJS)
+ifeq ("$(A52_SHARED)", "no")
+	$(CC) `cat $(OBJDIR)/c_flags` -shared -o $(SHARED) $(OBJS) $(ASMOBJS) $(NASMOBJS) `ls $(OBJDIR)/a52dec*/liba52/*.o` -Wl,-soname -Wl,libmpeg3.so
+else
+	$(CC) `cat $(OBJDIR)/c_flags` -shared -o $(SHARED) $(OBJS) $(ASMOBJS) $(NASMOBJS)  -Wl,-soname -Wl,libmpeg3.so
+endif
 
 $(OBJDIR)/mpeg3dump: $(OUTPUT) mpeg3dump.c
 	$(CC) `cat $(OBJDIR)/c_flags` -o $(OBJDIR)/mpeg3dump mpeg3dump.c $(OUTPUT) $(LIBS)
@@ -176,9 +166,6 @@
 $(OBJDIR)/mpeg3cat: $(OUTPUT) mpeg3cat.c
 	$(CC) `cat $(OBJDIR)/c_flags` -o $(OBJDIR)/mpeg3cat mpeg3cat.c $(OUTPUT) $(LIBS)
 
-#$(OBJDIR)/mpeg3split: $(OUTPUT)
-#	$(CC) `cat $(OBJDIR)/c_flags` -o $(OBJDIR)/mpeg3split mpeg3split.c $(OUTPUT) $(LIBS)
-
 $(OBJDIR)/mpeg2qt: $(OUTPUT)
 	$(CC) `cat $(OBJDIR)/c_flags` -o $(OBJDIR)/mpeg2qt mpeg2qt.c \
 		$(OUTPUT) \
@@ -190,10 +177,34 @@
 		-lz \
 		-ldl
 
-install: 
-	cp $(UTILS) $(PREFIX)/bin
-#	cp $(OUTPUT) $(PREFIX)/lib
-#	cp libmpeg3.h mpeg3private.h $(PREFIX)/include
+$(PKG_CONFIG_FILE):
+	@echo -e "prefix=$(PREFIX)\n\
+exec_prefix=$(PREFIX)\n\
+libdir=$(PREFIX)/$(DEST_LIB_DIR)\n\
+includedir=$(PREFIX)/include\n\
+\n\
+Name: libmpeg3\n\
+Description: Decoder of various derivatives of MPEG standards\n\
+Version: 1.7\n\
+Requires: \n\
+Conflicts: \n" > $(PKG_CONFIG_FILE)
+ifeq ("$(A52_SHARED)", "no")
+	@echo 'Libs: -L$${libdir} -lmpeg3 -lpthread' >> $(PKG_CONFIG_FILE)
+else
+	@echo 'Libs: -L$${libdir} -lmpeg3 -lpthread -la52' >> $(PKG_CONFIG_FILE)
+endif
+	@echo 'Cflags: -I$${includedir}' >> $(PKG_CONFIG_FILE)
+
+install:
+	install -d $(DESTDIR)$(BINDIR) $(DESTDIR)$(DEST_LIB_DIR) $(DESTDIR)$(INCLUDEDIR)/audio $(DESTDIR)$(INCLUDEDIR)/video $(DESTDIR)$(DEST_LIB_DIR)/pkgconfig
+	install -m 755 $(UTILS) $(DESTDIR)$(BINDIR)
+	install $(OUTPUT) $(DESTDIR)$(DEST_LIB_DIR)
+	install $(SHARED) $(DESTDIR)$(DEST_LIB_DIR)
+	install -m 644 *.h $(DESTDIR)$(INCLUDEDIR)
+	install -m 644 *.inc $(DESTDIR)$(INCLUDEDIR)
+	install -m 644 audio/*.h $(DESTDIR)$(INCLUDEDIR)/audio
+	install -m 644 video/*.h $(DESTDIR)$(INCLUDEDIR)/video
+	install -m 644 $(PKG_CONFIG_FILE) $(DESTDIR)$(DEST_LIB_DIR)/pkgconfig
 
 clean:
 	rm -rf $(OBJDIR)
@@ -211,8 +222,11 @@
 	$(CC) -c `cat $(OBJDIR)/c_flags` $(subst $(OBJDIR)/,, $*.S) -o $*.o
 $(NASMOBJS): 
 	$(NASM) -f elf $(subst $(OBJDIR)/,, $*.s) -o $*.o
+
+ifeq ("$(A52_SHARED)", "no")
 $(A52OBJS):
 	$(CC) -c `cat $(OBJDIR)/a52_flags` $(subst $(OBJDIR)/,, $*.c) -o $*.o
+endif
 
 $(OBJDIR)/libmpeg3.o: 				    libmpeg3.c
 $(OBJDIR)/mpeg3atrack.o: 			    mpeg3atrack.c
@@ -257,6 +271,6 @@
 $(OBJDIR)/video/vlc.o:  			    video/vlc.c
 $(OBJDIR)/workarounds.o:  			    workarounds.c
 
-
-
+ifeq ("$(A52_SHARED)", "no")
 include depend.a52
+endif