spandsp
0.0.6
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00001 /* 00002 * SpanDSP - a series of DSP components for telephony 00003 * 00004 * private/time_scale.h - Time scaling for linear speech data 00005 * 00006 * Written by Steve Underwood <steveu@coppice.org> 00007 * 00008 * Copyright (C) 2004 Steve Underwood 00009 * 00010 * All rights reserved. 00011 * 00012 * This program is free software; you can redistribute it and/or modify 00013 * it under the terms of the GNU Lesser General Public License version 2.1, 00014 * as published by the Free Software Foundation. 00015 * 00016 * This program is distributed in the hope that it will be useful, 00017 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00018 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00019 * GNU Lesser General Public License for more details. 00020 * 00021 * You should have received a copy of the GNU Lesser General Public 00022 * License along with this program; if not, write to the Free Software 00023 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 00024 */ 00025 00026 #if !defined(_SPANDSP_PRIVATE_TIME_SCALE_H_) 00027 #define _SPANDSP_PRIVATE_TIME_SCALE_H_ 00028 00029 #define TIME_SCALE_MAX_SAMPLE_RATE 48000 00030 #define TIME_SCALE_MIN_PITCH 60 00031 #define TIME_SCALE_MAX_PITCH 250 00032 #define TIME_SCALE_BUF_LEN (2*TIME_SCALE_MAX_SAMPLE_RATE/TIME_SCALE_MIN_PITCH) 00033 00034 /*! Audio time scaling descriptor. */ 00035 struct time_scale_state_s 00036 { 00037 int sample_rate; 00038 int min_pitch; 00039 int max_pitch; 00040 int buf_len; 00041 float playout_rate; 00042 double rcomp; 00043 double rate_nudge; 00044 int fill; 00045 int lcp; 00046 int16_t buf[TIME_SCALE_BUF_LEN]; 00047 }; 00048 00049 #endif 00050 /*- End of file ------------------------------------------------------------*/