loosen dependencies over mpegaudiodec

Originally committed as revision 9080 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/mpegaudiodecheader.h

@@ -0,0 +1,39 @@
+/*
+ * MPEG Audio header decoder
+ * Copyright (c) 2001, 2002 Fabrice Bellard.
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file mpegaudiodecheader.c
+ * MPEG Audio header decoder.
+ */
+
+#ifndef MPEGAUDIODECHEADER_H
+#define MPEGAUDIODECHEADER_H
+
+#include "common.h"
+#include "mpegaudio.h"
+
+
+/* header decoding. MUST check the header before because no
+   consistency check is done there. Return 1 if free format found and
+   that the frame size must be computed externally */
+int decode_header(MPADecodeContext *s, uint32_t header);
+
+#endif /* MPEGAUDIODECHEADER_H */