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 44 extern const float vbr_nb_thresh[9][11]; 45 extern const float vbr_hb_thresh[5][11]; 46 extern const float vbr_uhb_thresh[2][11]; 47 48 /** VBR state. */ 49 typedef 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 64 void vbr_init(VBRState *vbr); 65 66 float vbr_analysis(VBRState *vbr, spx_word16_t *sig, int len, int pitch, float pitch_coef); 67 68 void vbr_destroy(VBRState *vbr); 69 70 #endif 71