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DuerOS-Light-SDK-v1.1.0/duer-os-light/external/speex/libspeex/vbr.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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Who changed what in which revision?

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TMBOY 47:9e361da97763 1 /* Copyright (C) 2002 Jean-Marc Valin */
TMBOY 47:9e361da97763 2 /**
TMBOY 47:9e361da97763 3 @file vbr.h
TMBOY 47:9e361da97763 4 @brief Variable Bit-Rate (VBR) related routines
TMBOY 47:9e361da97763 5 */
TMBOY 47:9e361da97763 6 /*
TMBOY 47:9e361da97763 7 Redistribution and use in source and binary forms, with or without
TMBOY 47:9e361da97763 8 modification, are permitted provided that the following conditions
TMBOY 47:9e361da97763 9 are met:
TMBOY 47:9e361da97763 10
TMBOY 47:9e361da97763 11 - Redistributions of source code must retain the above copyright
TMBOY 47:9e361da97763 12 notice, this list of conditions and the following disclaimer.
TMBOY 47:9e361da97763 13
TMBOY 47:9e361da97763 14 - Redistributions in binary form must reproduce the above copyright
TMBOY 47:9e361da97763 15 notice, this list of conditions and the following disclaimer in the
TMBOY 47:9e361da97763 16 documentation and/or other materials provided with the distribution.
TMBOY 47:9e361da97763 17
TMBOY 47:9e361da97763 18 - Neither the name of the Xiph.org Foundation nor the names of its
TMBOY 47:9e361da97763 19 contributors may be used to endorse or promote products derived from
TMBOY 47:9e361da97763 20 this software without specific prior written permission.
TMBOY 47:9e361da97763 21
TMBOY 47:9e361da97763 22 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
TMBOY 47:9e361da97763 23 ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
TMBOY 47:9e361da97763 24 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
TMBOY 47:9e361da97763 25 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
TMBOY 47:9e361da97763 26 CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
TMBOY 47:9e361da97763 27 EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
TMBOY 47:9e361da97763 28 PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
TMBOY 47:9e361da97763 29 PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
TMBOY 47:9e361da97763 30 LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
TMBOY 47:9e361da97763 31 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
TMBOY 47:9e361da97763 32 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
TMBOY 47:9e361da97763 33
TMBOY 47:9e361da97763 34 */
TMBOY 47:9e361da97763 35
TMBOY 47:9e361da97763 36
TMBOY 47:9e361da97763 37 #ifndef VBR_H
TMBOY 47:9e361da97763 38 #define VBR_H
TMBOY 47:9e361da97763 39
TMBOY 47:9e361da97763 40 #include "misc.h"
TMBOY 47:9e361da97763 41
TMBOY 47:9e361da97763 42 #define VBR_MEMORY_SIZE 5
TMBOY 47:9e361da97763 43
TMBOY 47:9e361da97763 44 extern const float vbr_nb_thresh[9][11];
TMBOY 47:9e361da97763 45 extern const float vbr_hb_thresh[5][11];
TMBOY 47:9e361da97763 46 extern const float vbr_uhb_thresh[2][11];
TMBOY 47:9e361da97763 47
TMBOY 47:9e361da97763 48 /** VBR state. */
TMBOY 47:9e361da97763 49 typedef struct VBRState {
TMBOY 47:9e361da97763 50 float energy_alpha;
TMBOY 47:9e361da97763 51 float average_energy;
TMBOY 47:9e361da97763 52 float last_energy;
TMBOY 47:9e361da97763 53 float last_log_energy[VBR_MEMORY_SIZE];
TMBOY 47:9e361da97763 54 float accum_sum;
TMBOY 47:9e361da97763 55 float last_pitch_coef;
TMBOY 47:9e361da97763 56 float soft_pitch;
TMBOY 47:9e361da97763 57 float last_quality;
TMBOY 47:9e361da97763 58 float noise_level;
TMBOY 47:9e361da97763 59 float noise_accum;
TMBOY 47:9e361da97763 60 float noise_accum_count;
TMBOY 47:9e361da97763 61 int consec_noise;
TMBOY 47:9e361da97763 62 } VBRState;
TMBOY 47:9e361da97763 63
TMBOY 47:9e361da97763 64 void vbr_init(VBRState *vbr);
TMBOY 47:9e361da97763 65
TMBOY 47:9e361da97763 66 float vbr_analysis(VBRState *vbr, spx_word16_t *sig, int len, int pitch, float pitch_coef);
TMBOY 47:9e361da97763 67
TMBOY 47:9e361da97763 68 void vbr_destroy(VBRState *vbr);
TMBOY 47:9e361da97763 69
TMBOY 47:9e361da97763 70 #endif