vbr.h revision 98913fed6520d8849fb2e246be943e04474aefa4 
1/* Copyright (C) 2002 Jean-Marc Valin */
2/**
3   @file vbr.h
4   @brief Variable Bit-Rate (VBR) related routines
5*/
6/*
7   Redistribution and use in source and binary forms, with or without
8   modification, are permitted provided that the following conditions
9   are met:
10
11   - Redistributions of source code must retain the above copyright
12   notice, this list of conditions and the following disclaimer.
13
14   - Redistributions in binary form must reproduce the above copyright
15   notice, this list of conditions and the following disclaimer in the
16   documentation and/or other materials provided with the distribution.
17
18   - Neither the name of the Xiph.org Foundation nor the names of its
19   contributors may be used to endorse or promote products derived from
20   this software without specific prior written permission.
21
22   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
23   ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
24   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
25   A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR
26   CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
27   EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
28   PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
29   PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
30   LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
31   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
32   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33
34*/
35
36
37#ifndef VBR_H
38#define VBR_H
39
40#include "arch.h"
41
42#define VBR_MEMORY_SIZE 5
43
44extern const float vbr_nb_thresh[9][11];
45extern const float vbr_hb_thresh[5][11];
46extern const float vbr_uhb_thresh[2][11];
47
48/** VBR state. */
49typedef struct VBRState {
50   float energy_alpha;
51   float average_energy;
52   float last_energy;
53   float last_log_energy[VBR_MEMORY_SIZE];
54   float accum_sum;
55   float last_pitch_coef;
56   float soft_pitch;
57   float last_quality;
58   float noise_level;
59   float noise_accum;
60   float noise_accum_count;
61   int   consec_noise;
62} VBRState;
63
64void vbr_init(VBRState *vbr);
65
66float vbr_analysis(VBRState *vbr, spx_word16_t *sig, int len, int pitch, float pitch_coef);
67
68void vbr_destroy(VBRState *vbr);
69
70#endif
71