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diff --git a/media/libvorbis/lib/bitrate.h b/media/libvorbis/lib/bitrate.h
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+/********************************************************************
+ * *
+ * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE. *
+ * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
+ * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
+ * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
+ * *
+ * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2007 *
+ * by the Xiph.Org Foundation http://www.xiph.org/ *
+ * *
+ ********************************************************************
+
+ function: bitrate tracking and management
+ last mod: $Id: bitrate.h 13293 2007-07-24 00:09:47Z xiphmont $
+
+ ********************************************************************/
+
+#ifndef _V_BITRATE_H_
+#define _V_BITRATE_H_
+
+#include "vorbis/codec.h"
+#include "codec_internal.h"
+#include "os.h"
+
+/* encode side bitrate tracking */
+typedef struct bitrate_manager_state {
+ int managed;
+
+ long avg_reservoir;
+ long minmax_reservoir;
+ long avg_bitsper;
+ long min_bitsper;
+ long max_bitsper;
+
+ long short_per_long;
+ double avgfloat;
+
+ vorbis_block *vb;
+ int choice;
+} bitrate_manager_state;
+
+typedef struct bitrate_manager_info{
+ long avg_rate;
+ long min_rate;
+ long max_rate;
+ long reservoir_bits;
+ double reservoir_bias;
+
+ double slew_damp;
+
+} bitrate_manager_info;
+
+extern void vorbis_bitrate_init(vorbis_info *vi,bitrate_manager_state *bs);
+extern void vorbis_bitrate_clear(bitrate_manager_state *bs);
+extern int vorbis_bitrate_managed(vorbis_block *vb);
+extern int vorbis_bitrate_addblock(vorbis_block *vb);
+extern int vorbis_bitrate_flushpacket(vorbis_dsp_state *vd, ogg_packet *op);
+
+#endif