forked from len0rd/rockbox
85b325fdb9
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@15613 a1c6a512-1295-4272-9138-f99709370657
70 lines
2.3 KiB
C
70 lines
2.3 KiB
C
/* Copyright (C) 2002 Jean-Marc Valin */
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/**
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@file vbr.h
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@brief Variable Bit-Rate (VBR) related routines
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*/
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/*
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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- Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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- Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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- Neither the name of the Xiph.org Foundation nor the names of its
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
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CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef VBR_H
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#define VBR_H
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#include "arch.h"
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#define VBR_MEMORY_SIZE 5
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extern const float vbr_nb_thresh[9][11];
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extern const float vbr_hb_thresh[5][11];
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extern const float vbr_uhb_thresh[2][11];
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/** VBR state. */
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typedef struct VBRState {
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float energy_alpha;
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float average_energy;
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float last_energy;
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float last_log_energy[VBR_MEMORY_SIZE];
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float accum_sum;
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float last_pitch_coef;
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float soft_pitch;
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float last_quality;
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float noise_level;
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float noise_accum;
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float noise_accum_count;
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int consec_noise;
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} VBRState;
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void vbr_init(VBRState *vbr);
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float vbr_analysis(VBRState *vbr, spx_word16_t *sig, int len, int pitch, float pitch_coef);
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void vbr_destroy(VBRState *vbr);
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#endif
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