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+/* Copyright (C) 2002 Jean-Marc Valin */
+/**
+ @file vbr.h
+ @brief Variable Bit-Rate (VBR) related routines
+*/
+/*
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions
+ are met:
+
+ - Redistributions of source code must retain the above copyright
+ notice, this list of conditions and the following disclaimer.
+
+ - Redistributions in binary form must reproduce the above copyright
+ notice, this list of conditions and the following disclaimer in the
+ documentation and/or other materials provided with the distribution.
+
+ - Neither the name of the Xiph.org Foundation nor the names of its
+ contributors may be used to endorse or promote products derived from
+ this software without specific prior written permission.
+
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
+ CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+*/
+
+
+#ifndef VBR_H
+#define VBR_H
+
+#include "arch.h"
+
+#define VBR_MEMORY_SIZE 5
+
+extern const float vbr_nb_thresh[9][11];
+extern const float vbr_hb_thresh[5][11];
+extern const float vbr_uhb_thresh[2][11];
+
+/** VBR state. */
+typedef struct VBRState {
+ float energy_alpha;
+ float average_energy;
+ float last_energy;
+ float last_log_energy[VBR_MEMORY_SIZE];
+ float accum_sum;
+ float last_pitch_coef;
+ float soft_pitch;
+ float last_quality;
+ float noise_level;
+ float noise_accum;
+ float noise_accum_count;
+ int consec_noise;
+} VBRState;
+
+void vbr_init(VBRState *vbr);
+
+float vbr_analysis(VBRState *vbr, spx_word16_t *sig, int len, int pitch, float pitch_coef);
+
+void vbr_destroy(VBRState *vbr);
+
+#endif