cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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oslec.h (2297B)

      1/* SPDX-License-Identifier: GPL-2.0-only */
      2/*
      3 *  OSLEC - A line echo canceller.  This code is being developed
      4 *          against and partially complies with G168. Using code from SpanDSP
      5 *
      6 * Written by Steve Underwood <steveu@coppice.org>
      7 *         and David Rowe <david_at_rowetel_dot_com>
      8 *
      9 * Copyright (C) 2001 Steve Underwood and 2007-2008 David Rowe
     10 *
     11 * All rights reserved.
     12 */
     13
     14#ifndef __OSLEC_H
     15#define __OSLEC_H
     16
     17/* Mask bits for the adaption mode */
     18#define ECHO_CAN_USE_ADAPTION	0x01
     19#define ECHO_CAN_USE_NLP	0x02
     20#define ECHO_CAN_USE_CNG	0x04
     21#define ECHO_CAN_USE_CLIP	0x08
     22#define ECHO_CAN_USE_TX_HPF	0x10
     23#define ECHO_CAN_USE_RX_HPF	0x20
     24#define ECHO_CAN_DISABLE	0x40
     25
     26/**
     27 * oslec_state: G.168 echo canceller descriptor.
     28 *
     29 * This defines the working state for a line echo canceller.
     30 */
     31struct oslec_state;
     32
     33/**
     34 * oslec_create - Create a voice echo canceller context.
     35 * @len: The length of the canceller, in samples.
     36 * @return: The new canceller context, or NULL if the canceller could not be
     37 * created.
     38 */
     39struct oslec_state *oslec_create(int len, int adaption_mode);
     40
     41/**
     42 * oslec_free - Free a voice echo canceller context.
     43 * @ec: The echo canceller context.
     44 */
     45void oslec_free(struct oslec_state *ec);
     46
     47/**
     48 * oslec_flush - Flush (reinitialise) a voice echo canceller context.
     49 * @ec: The echo canceller context.
     50 */
     51void oslec_flush(struct oslec_state *ec);
     52
     53/**
     54 * oslec_adaption_mode - set the adaption mode of a voice echo canceller context.
     55 * @ec The echo canceller context.
     56 * @adaption_mode: The mode.
     57 */
     58void oslec_adaption_mode(struct oslec_state *ec, int adaption_mode);
     59
     60void oslec_snapshot(struct oslec_state *ec);
     61
     62/**
     63 * oslec_update: Process a sample through a voice echo canceller.
     64 * @ec: The echo canceller context.
     65 * @tx: The transmitted audio sample.
     66 * @rx: The received audio sample.
     67 *
     68 * The return value is the clean (echo cancelled) received sample.
     69 */
     70int16_t oslec_update(struct oslec_state *ec, int16_t tx, int16_t rx);
     71
     72/**
     73 * oslec_hpf_tx: Process to high pass filter the tx signal.
     74 * @ec: The echo canceller context.
     75 * @tx: The transmitted auio sample.
     76 *
     77 * The return value is the HP filtered transmit sample, send this to your D/A.
     78 */
     79int16_t oslec_hpf_tx(struct oslec_state *ec, int16_t tx);
     80
     81#endif /* __OSLEC_H */