AC_DEFUN([AM_PATH_FAAD],
[dnl ##
dnl faad
dnl ##

AC_ARG_ENABLE(aac,
	AS_HELP_STRING([--disable-aac],
		[disable AAC support (default: enable)]),,
	enable_aac=yes)

if test x$enable_aac = xyes; then
	FAAD_LIBS="-lfaad"
	FAAD_CFLAGS=""

	oldcflags=$CFLAGS
	oldlibs=$LIBS
	oldcppflags=$CPPFLAGS
	CFLAGS="$CFLAGS $FAAD_CFLAGS -I."
	LIBS="$LIBS $FAAD_LIBS"
	CPPFLAGS=$CFLAGS
	AC_CHECK_HEADER(faad.h,,enable_aac=no)
	if test x$enable_aac = xyes; then
		AC_CHECK_DECL(FAAD2_VERSION,,enable_aac=no,[#include <faad.h>])
	fi
	if test x$enable_aac = xyes; then
		AC_CHECK_DECL(faacDecInit2,,enable_aac=no,[#include <faad.h>])
	fi
	if test x$enable_aac = xyes; then
		AC_CHECK_LIB(faad,faacDecInit2,,enable_aac=no)
		if test x$enable_aac = xno; then
			enable_aac=yes
			AC_CHECK_LIB(faad,NeAACDecInit2,,enable_aac=no)
		fi
	fi
	if test x$enable_aac = xyes; then
  		AC_MSG_CHECKING(that FAAD2 uses buffer and bufferlen)
		AC_COMPILE_IFELSE([AC_LANG_SOURCE([
#include <faad.h>

int main() {
	char buffer;
	long bufferlen = 0;
	faacDecHandle decoder;
	faacDecFrameInfo frameInfo;
	faacDecConfigurationPtr config;
	unsigned char channels;
	long sampleRate;
        mp4AudioSpecificConfig mp4ASC;

	decoder = faacDecOpen();
	config = faacDecGetCurrentConfiguration(decoder);
	config->outputFormat = FAAD_FMT_16BIT;
	faacDecSetConfiguration(decoder,config);
	AudioSpecificConfig(&buffer, bufferlen, &mp4ASC);
	faacDecInit(decoder,&buffer,bufferlen,&sampleRate,&channels);
	faacDecInit2(decoder,&buffer,bufferlen,&sampleRate,&channels);
	faacDecDecode(decoder,&frameInfo,&buffer,bufferlen);

	return 0;
}
])],[AC_MSG_RESULT(yes);AC_DEFINE(HAVE_FAAD_BUFLEN_FUNCS,1,[Define if FAAD2 uses buflen in function calls])],[AC_MSG_RESULT(no);
		AC_MSG_CHECKING(that FAAD2 can even be used)
		AC_COMPILE_IFELSE([AC_LANG_SOURCE([
#include <faad.h>

int main() {
	char buffer;
	faacDecHandle decoder;
	faacDecFrameInfo frameInfo;
	faacDecConfigurationPtr config;
	unsigned char channels;
	long sampleRate;
	long bufferlen = 0;
	unsigned long dummy1_32;
        unsigned char dummy2_8, dummy3_8, dummy4_8, dummy5_8, dummy6_8,
                                dummy7_8, dummy8_8;

	decoder = faacDecOpen();
	config = faacDecGetCurrentConfiguration(decoder);
	config->outputFormat = FAAD_FMT_16BIT;
	faacDecSetConfiguration(decoder,config);
	AudioSpecificConfig(&buffer,&dummy1_32,&dummy2_8,
                                &dummy3_8,&dummy4_8,&dummy5_8,
                                &dummy6_8,&dummy7_8,&dummy8_8);
	faacDecInit(decoder,&buffer,&sampleRate,&channels);
	faacDecInit2(decoder,&buffer,bufferlen,&sampleRate,&channels);
	faacDecDecode(decoder,&frameInfo,&buffer);
	faacDecClose(decoder);

	return 0;
}
])],AC_MSG_RESULT(yes),[AC_MSG_RESULT(no);enable_aac=no])
		])
	fi
	if test x$enable_aac = xyes; then
		AC_CHECK_MEMBERS([faacDecConfiguration.downMatrix,faacDecConfiguration.dontUpSampleImplicitSBR,faacDecFrameInfo.samplerate],,,[#include <faad.h>])
		AC_DEFINE(HAVE_FAAD,1,[Define to use FAAD2 for AAC decoding])
	else
		AC_MSG_WARN([faad2 lib needed for MP4/AAC support -- disabling MP4/AAC support])
	fi
	CFLAGS=$oldcflags
	LIBS=$oldlibs
	CPPFLAGS=$oldcppflags
fi

if test x$enable_aac = xyes; then
	oldcflags=$CFLAGS
	oldlibs=$LIBS
	oldcppflags=$CPPFLAGS
	CFLAGS="$CFLAGS $FAAD_CFLAGS -Werror"
	LIBS="$LIBS $FAAD_LIBS"
	CPPFLAGS=$CFLAGS

	AC_MSG_CHECKING(for broken libfaad headers)
	AC_COMPILE_IFELSE([AC_LANG_SOURCE([
#include <faad.h>
#include <stddef.h>
#include <stdint.h>

int main() {
	unsigned char channels;
	uint32_t sample_rate;

	faacDecInit2(NULL, NULL, 0, &sample_rate, &channels);
	return 0;
}
	])],
		[AC_MSG_RESULT(correct)],
		[AC_MSG_RESULT(broken);
		AC_DEFINE(HAVE_FAAD_LONG, 1, [Define if faad.h uses the broken "unsigned long" pointers])])

	CFLAGS=$oldcflags
	LIBS=$oldlibs
	CPPFLAGS=$oldcppflags
fi

AC_SUBST(FAAD_CFLAGS)
AC_SUBST(FAAD_LIBS)

])