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DuerOS-Light-SDK-v1.1.0/duer-os-light/external/speex/libspeex/vorbis_psy.h@47:9e361da97763, 2017-07-18 (annotated)

Committer:
TMBOY
Date:
Tue Jul 18 16:54:45 2017 +0800
Revision:
47:9e361da97763
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TMBOY 47:9e361da97763 1 /* Copyright (C) 2005 Jean-Marc Valin, CSIRO, Christopher Montgomery
TMBOY 47:9e361da97763 2 File: vorbis_psy.h
TMBOY 47:9e361da97763 3
TMBOY 47:9e361da97763 4 Redistribution and use in source and binary forms, with or without
TMBOY 47:9e361da97763 5 modification, are permitted provided that the following conditions
TMBOY 47:9e361da97763 6 are met:
TMBOY 47:9e361da97763 7
TMBOY 47:9e361da97763 8 - Redistributions of source code must retain the above copyright
TMBOY 47:9e361da97763 9 notice, this list of conditions and the following disclaimer.
TMBOY 47:9e361da97763 10
TMBOY 47:9e361da97763 11 - Redistributions in binary form must reproduce the above copyright
TMBOY 47:9e361da97763 12 notice, this list of conditions and the following disclaimer in the
TMBOY 47:9e361da97763 13 documentation and/or other materials provided with the distribution.
TMBOY 47:9e361da97763 14
TMBOY 47:9e361da97763 15 - Neither the name of the Xiph.org Foundation nor the names of its
TMBOY 47:9e361da97763 16 contributors may be used to endorse or promote products derived from
TMBOY 47:9e361da97763 17 this software without specific prior written permission.
TMBOY 47:9e361da97763 18
TMBOY 47:9e361da97763 19 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
TMBOY 47:9e361da97763 20 ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
TMBOY 47:9e361da97763 21 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
TMBOY 47:9e361da97763 22 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
TMBOY 47:9e361da97763 23 CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
TMBOY 47:9e361da97763 24 EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
TMBOY 47:9e361da97763 25 PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
TMBOY 47:9e361da97763 26 PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
TMBOY 47:9e361da97763 27 LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
TMBOY 47:9e361da97763 28 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
TMBOY 47:9e361da97763 29 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
TMBOY 47:9e361da97763 30 */
TMBOY 47:9e361da97763 31
TMBOY 47:9e361da97763 32 #ifndef VORBIS_PSY_H
TMBOY 47:9e361da97763 33 #define VORBIS_PSY_H
TMBOY 47:9e361da97763 34
TMBOY 47:9e361da97763 35 #ifdef VORBIS_PSYCHO
TMBOY 47:9e361da97763 36
TMBOY 47:9e361da97763 37 #include "smallft.h"
TMBOY 47:9e361da97763 38 #define P_BANDS 17 /* 62Hz to 16kHz */
TMBOY 47:9e361da97763 39 #define NOISE_COMPAND_LEVELS 40
TMBOY 47:9e361da97763 40
TMBOY 47:9e361da97763 41
TMBOY 47:9e361da97763 42 #define todB(x) ((x)==0?-400.f:log((x)*(x))*4.34294480f)
TMBOY 47:9e361da97763 43 #define fromdB(x) (exp((x)*.11512925f))
TMBOY 47:9e361da97763 44
TMBOY 47:9e361da97763 45 /* The bark scale equations are approximations, since the original
TMBOY 47:9e361da97763 46 table was somewhat hand rolled. The below are chosen to have the
TMBOY 47:9e361da97763 47 best possible fit to the rolled tables, thus their somewhat odd
TMBOY 47:9e361da97763 48 appearance (these are more accurate and over a longer range than
TMBOY 47:9e361da97763 49 the oft-quoted bark equations found in the texts I have). The
TMBOY 47:9e361da97763 50 approximations are valid from 0 - 30kHz (nyquist) or so.
TMBOY 47:9e361da97763 51
TMBOY 47:9e361da97763 52 all f in Hz, z in Bark */
TMBOY 47:9e361da97763 53
TMBOY 47:9e361da97763 54 #define toBARK(n) (13.1f*atan(.00074f*(n))+2.24f*atan((n)*(n)*1.85e-8f)+1e-4f*(n))
TMBOY 47:9e361da97763 55 #define fromBARK(z) (102.f*(z)-2.f*pow(z,2.f)+.4f*pow(z,3.f)+pow(1.46f,z)-1.f)
TMBOY 47:9e361da97763 56
TMBOY 47:9e361da97763 57 /* Frequency to octave. We arbitrarily declare 63.5 Hz to be octave
TMBOY 47:9e361da97763 58 0.0 */
TMBOY 47:9e361da97763 59
TMBOY 47:9e361da97763 60 #define toOC(n) (log(n)*1.442695f-5.965784f)
TMBOY 47:9e361da97763 61 #define fromOC(o) (exp(((o)+5.965784f)*.693147f))
TMBOY 47:9e361da97763 62
TMBOY 47:9e361da97763 63
TMBOY 47:9e361da97763 64 typedef struct {
TMBOY 47:9e361da97763 65
TMBOY 47:9e361da97763 66 float noisewindowlo;
TMBOY 47:9e361da97763 67 float noisewindowhi;
TMBOY 47:9e361da97763 68 int noisewindowlomin;
TMBOY 47:9e361da97763 69 int noisewindowhimin;
TMBOY 47:9e361da97763 70 int noisewindowfixed;
TMBOY 47:9e361da97763 71 float noiseoff[P_BANDS];
TMBOY 47:9e361da97763 72 float noisecompand[NOISE_COMPAND_LEVELS];
TMBOY 47:9e361da97763 73
TMBOY 47:9e361da97763 74 } VorbisPsyInfo;
TMBOY 47:9e361da97763 75
TMBOY 47:9e361da97763 76
TMBOY 47:9e361da97763 77
TMBOY 47:9e361da97763 78 typedef struct {
TMBOY 47:9e361da97763 79 int n;
TMBOY 47:9e361da97763 80 int rate;
TMBOY 47:9e361da97763 81 struct drft_lookup lookup;
TMBOY 47:9e361da97763 82 VorbisPsyInfo *vi;
TMBOY 47:9e361da97763 83
TMBOY 47:9e361da97763 84 float *window;
TMBOY 47:9e361da97763 85 float *noiseoffset;
TMBOY 47:9e361da97763 86 long *bark;
TMBOY 47:9e361da97763 87
TMBOY 47:9e361da97763 88 } VorbisPsy;
TMBOY 47:9e361da97763 89
TMBOY 47:9e361da97763 90
TMBOY 47:9e361da97763 91 VorbisPsy *vorbis_psy_init(int rate, int size);
TMBOY 47:9e361da97763 92 void vorbis_psy_destroy(VorbisPsy *psy);
TMBOY 47:9e361da97763 93 void compute_curve(VorbisPsy *psy, float *audio, float *curve);
TMBOY 47:9e361da97763 94 void curve_to_lpc(VorbisPsy *psy, float *curve, float *awk1, float *awk2, int ord);
TMBOY 47:9e361da97763 95
TMBOY 47:9e361da97763 96 #endif
TMBOY 47:9e361da97763 97 #endif