audiodecoder: Fix compile with ENABLE_FFMPEGDEC

src/driver/audiometadata.h

@@ -36,8 +36,15 @@
 #ifndef __AUDIO_METADATA__
 #define __AUDIO_METADATA__
 
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
 #include <string>
+
+#ifndef ENABLE_FFMPEGDEC
 #include <mad.h>
+#endif
 
 class CAudioMetaData
 {
@@ -69,8 +76,10 @@ public:
 	unsigned int bitrate; /* overall bitrate, vbr file: current bitrate */
 	unsigned int avg_bitrate; /* average bitrate in case of vbr file */
 	unsigned int samplerate;
+#ifndef ENABLE_FFMPEGDEC
 	enum mad_layer layer;
 	enum mad_mode mode;
+#endif
 	time_t total_time;
 	long audio_start_pos; /* position of first audio frame */
 	bool vbr;