1 files changed, 48 insertions, 0 deletions
diff --git a/libmpdemux/aac_hdr.c b/libmpdemux/aac_hdr.c
new file mode 100644
index 0000000000..b9ca15c748
--- /dev/null
+++ b/libmpdemux/aac_hdr.c
@@ -0,0 +1,48 @@
+/*
+ * Copyright (C) 2005 Nico Sabbi
+ *
+ * This file is part of MPlayer.
+ *
+ * MPlayer is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * MPlayer 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with MPlayer; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include <stdlib.h>
+#include <inttypes.h>
+
+#include "config.h"
+
+/// \param srate (out) sample rate
+/// \param num (out) number of audio frames in this ADTS frame
+/// \return size of the ADTS frame in bytes
+/// aac_parse_frames needs a buffer at least 8 bytes long
+int aac_parse_frame(uint8_t *buf, int *srate, int *num)
+{
+	int i = 0, sr, fl = 0, id;
+	static int srates[] = {96000, 88200, 64000, 48000, 44100, 32000, 24000, 22050, 16000, 12000, 11025, 8000, 0, 0, 0};
+	
+	if((buf[i] != 0xFF) || ((buf[i+1] & 0xF6) != 0xF0))
+		return 0;
+	
+	id = (buf[i+1] >> 3) & 0x01;	//id=1 mpeg2, 0: mpeg4
+	sr = (buf[i+2] >> 2)  & 0x0F;
+	if(sr > 11)
+		return 0;
+	*srate = srates[sr];
+
+	fl = ((buf[i+3] & 0x03) << 11) | (buf[i+4] << 3) | ((buf[i+5] >> 5) & 0x07);
+	*num = (buf[i+6] & 0x02) + 1;
+
+	return fl;
+}