70 lines
2.3 KiB
C
70 lines
2.3 KiB
C
/* 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
|