Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) /* SPDX-License-Identifier: GPL-2.0-only */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  *  OSLEC - A line echo canceller.  This code is being developed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  *          against and partially complies with G168. Using code from SpanDSP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  * Written by Steve Underwood <steveu@coppice.org>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7)  *         and David Rowe <david_at_rowetel_dot_com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9)  * Copyright (C) 2001 Steve Underwood and 2007-2008 David Rowe
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)  * All rights reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #ifndef __OSLEC_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #define __OSLEC_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) /* Mask bits for the adaption mode */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #define ECHO_CAN_USE_ADAPTION	0x01
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #define ECHO_CAN_USE_NLP	0x02
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #define ECHO_CAN_USE_CNG	0x04
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #define ECHO_CAN_USE_CLIP	0x08
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #define ECHO_CAN_USE_TX_HPF	0x10
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #define ECHO_CAN_USE_RX_HPF	0x20
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #define ECHO_CAN_DISABLE	0x40
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)  * oslec_state: G.168 echo canceller descriptor.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29)  * This defines the working state for a line echo canceller.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) struct oslec_state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)  * oslec_create - Create a voice echo canceller context.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)  * @len: The length of the canceller, in samples.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)  * @return: The new canceller context, or NULL if the canceller could not be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)  * created.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) struct oslec_state *oslec_create(int len, int adaption_mode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)  * oslec_free - Free a voice echo canceller context.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43)  * @ec: The echo canceller context.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) void oslec_free(struct oslec_state *ec);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)  * oslec_flush - Flush (reinitialise) a voice echo canceller context.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49)  * @ec: The echo canceller context.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) void oslec_flush(struct oslec_state *ec);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)  * oslec_adaption_mode - set the adaption mode of a voice echo canceller context.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55)  * @ec The echo canceller context.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56)  * @adaption_mode: The mode.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) void oslec_adaption_mode(struct oslec_state *ec, int adaption_mode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) void oslec_snapshot(struct oslec_state *ec);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63)  * oslec_update: Process a sample through a voice echo canceller.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64)  * @ec: The echo canceller context.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65)  * @tx: The transmitted audio sample.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66)  * @rx: The received audio sample.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68)  * The return value is the clean (echo cancelled) received sample.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) int16_t oslec_update(struct oslec_state *ec, int16_t tx, int16_t rx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73)  * oslec_hpf_tx: Process to high pass filter the tx signal.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74)  * @ec: The echo canceller context.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75)  * @tx: The transmitted auio sample.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77)  * The return value is the HP filtered transmit sample, send this to your D/A.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) int16_t oslec_hpf_tx(struct oslec_state *ec, int16_t tx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) #endif /* __OSLEC_H */