spandsp: time_scale.h Source File

spandsp 0.0.6

private/time_scale.h
1/*
2 * SpanDSP - a series of DSP components for telephony
3 *
4 * private/time_scale.h - Time scaling for linear speech data
5 *
6 * Written by Steve Underwood <steveu@coppice.org>
7 *
8 * Copyright (C) 2004 Steve Underwood
9 *
10 * All rights reserved.
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU Lesser General Public License version 2.1,
14 * as published by the Free Software Foundation.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU Lesser General Public License for more details.
20 *
21 * You should have received a copy of the GNU Lesser General Public
22 * License along with this program; if not, write to the Free Software
23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 */
25
26#if !defined(_SPANDSP_PRIVATE_TIME_SCALE_H_)
27#define _SPANDSP_PRIVATE_TIME_SCALE_H_
28
29#define TIME_SCALE_MAX_SAMPLE_RATE 48000
30#define TIME_SCALE_MIN_PITCH 60
31#define TIME_SCALE_MAX_PITCH 250
32#define TIME_SCALE_BUF_LEN (2*TIME_SCALE_MAX_SAMPLE_RATE/TIME_SCALE_MIN_PITCH)
33
34/*! Audio time scaling descriptor. */
35 struct time_scale_state_s
36{
37 int sample_rate;
38 int min_pitch;
39 int max_pitch;
40 int buf_len;
41 float playout_rate;
42 double rcomp;
43 double rate_nudge;
44 int fill;
45 int lcp;
46 int16_t buf[TIME_SCALE_BUF_LEN];
47};
48
49#endif
50/*- End of file ------------------------------------------------------------*/
time_scale_state_s
Definition private/time_scale.h:36