aac: detect whether to pass "uint32_t*" to NeAACDecInit2()

neaacdec.h declares all arguments as "unsigned long", but internally
expects uint32_t pointers.  This triggers gcc warnings on 64 bit
architectures.  To avoid that, make configure.ac detect whether we're
using Debian's corrected headers or the original libfaad headers.  In
any case, pass a pointer to an uint32_t, conditionally casted to
"unsigned long*".

configure.ac

@@ -622,6 +622,37 @@ fi
 
 AM_CONDITIONAL(HAVE_FAAD, test x$enable_aac = xyes)
 
+if test x$enable_aac = xyes; then
+	oldcflags=$CFLAGS
+	oldlibs=$LIBS
+	oldcppflags=$CPPFLAGS
+	CFLAGS="$CFLAGS $MPD_CFLAGS $FAAD_CFLAGS -Werror"
+	LIBS="$LIBS $MPD_LIBS $FAAD_LIBS"
+	CPPFLAGS=$CFLAGS
+
+	AC_MSG_CHECKING(for broken libfaad headers)
+	AC_COMPILE_IFELSE([
+#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=$oldcppflags
+fi
+
 if test x$enable_aac = xyes; then
 	enable_mp4=yes
 	MP4FF_LIBS="-lmp4ff"

src/decoder/aac_plugin.c

@@ -251,7 +251,15 @@ static float getAacFloatTotalTime(const char *file)
 	float length;
 	faacDecHandle decoder;
 	faacDecConfigurationPtr config;
-	unsigned long sample_rate;
+	uint32_t sample_rate;
+#ifdef HAVE_FAAD_LONG
+	/* neaacdec.h declares all arguments as "unsigned long", but
+	   internally expects uint32_t pointers.  To avoid gcc
+	   warnings, use this workaround. */
+	unsigned long *sample_rate_r = (unsigned long*)&sample_rate;
+#else
+	uint32_t *sample_rate_r = &sample_rate;
+#endif
 	unsigned char channels;
 	struct input_stream inStream;
 	long bread;
@@ -272,9 +280,9 @@ static float getAacFloatTotalTime(const char *file)
 		fillAacBuffer(&b);
 #ifdef HAVE_FAAD_BUFLEN_FUNCS
 		bread = faacDecInit(decoder, b.buffer, b.bytesIntoBuffer,
-				    &sample_rate, &channels);
+				    sample_rate_r, &channels);
 #else
-		bread = faacDecInit(decoder, b.buffer, &sample_rate, &channels);
+		bread = faacDecInit(decoder, b.buffer, sample_rate_r, &channels);
 #endif
 		if (bread >= 0 && sample_rate > 0 && channels > 0)
 			length = 0;
@@ -307,7 +315,15 @@ aac_stream_decode(struct decoder *mpd_decoder, struct input_stream *inStream)
 	faacDecFrameInfo frameInfo;
 	faacDecConfigurationPtr config;
 	long bread;
-	unsigned long sample_rate;
+	uint32_t sample_rate;
+#ifdef HAVE_FAAD_LONG
+	/* neaacdec.h declares all arguments as "unsigned long", but
+	   internally expects uint32_t pointers.  To avoid gcc
+	   warnings, use this workaround. */
+	unsigned long *sample_rate_r = (unsigned long*)&sample_rate;
+#else
+	uint32_t *sample_rate_r = &sample_rate;
+#endif
 	unsigned char channels;
 	unsigned int sampleCount;
 	char *sampleBuffer;
@@ -343,9 +359,9 @@ aac_stream_decode(struct decoder *mpd_decoder, struct input_stream *inStream)
 
 #ifdef HAVE_FAAD_BUFLEN_FUNCS
 	bread = faacDecInit(decoder, b.buffer, b.bytesIntoBuffer,
-			    &sample_rate, &channels);
+			    sample_rate_r, &channels);
 #else
-	bread = faacDecInit(decoder, b.buffer, &sample_rate, &channels);
+	bread = faacDecInit(decoder, b.buffer, sample_rate_r, &channels);
 #endif
 	if (bread < 0) {
 		ERROR("Error not a AAC stream.\n");

src/decoder/mp4_plugin.c

@@ -112,6 +112,14 @@ mp4_decode(struct decoder *mpd_decoder, struct input_stream *input_stream)
 	unsigned char *mp4_buffer;
 	unsigned int mp4_buffer_size;
 	uint32_t sample_rate;
+#ifdef HAVE_FAAD_LONG
+	/* neaacdec.h declares all arguments as "unsigned long", but
+	   internally expects uint32_t pointers.  To avoid gcc
+	   warnings, use this workaround. */
+	unsigned long *sample_rate_r = (unsigned long*)&sample_rate;
+#else
+	uint32_t *sample_rate_r = &sample_rate;
+#endif
 	unsigned char channels;
 	long sample_id;
 	long num_samples;
@@ -160,7 +168,7 @@ mp4_decode(struct decoder *mpd_decoder, struct input_stream *input_stream)
 	mp4ff_get_decoder_config(mp4fh, track, &mp4_buffer, &mp4_buffer_size);
 
 	if (faacDecInit2(decoder, mp4_buffer, mp4_buffer_size,
-			 &sample_rate, &channels) < 0) {
+			 sample_rate_r, &channels) < 0) {
 		g_warning("Not an AAC stream.\n");
 		faacDecClose(decoder);
 		mp4ff_close(mp4fh);