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Diffstat (limited to 'drivers/staging/echo/oslec.h')
| -rw-r--r-- | drivers/staging/echo/oslec.h | 86 |
1 files changed, 0 insertions, 86 deletions
diff --git a/drivers/staging/echo/oslec.h b/drivers/staging/echo/oslec.h deleted file mode 100644 index bad852328a2..00000000000 --- a/drivers/staging/echo/oslec.h +++ /dev/null @@ -1,86 +0,0 @@ -/* - * OSLEC - A line echo canceller. This code is being developed - * against and partially complies with G168. Using code from SpanDSP - * - * Written by Steve Underwood <steveu@coppice.org> - * and David Rowe <david_at_rowetel_dot_com> - * - * Copyright (C) 2001 Steve Underwood and 2007-2008 David Rowe - * - * All rights reserved. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2, as - * published by the Free Software Foundation. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. - * - */ - -#ifndef __OSLEC_H -#define __OSLEC_H - -/* TODO: document interface */ - -/* Mask bits for the adaption mode */ -#define ECHO_CAN_USE_ADAPTION 0x01 -#define ECHO_CAN_USE_NLP 0x02 -#define ECHO_CAN_USE_CNG 0x04 -#define ECHO_CAN_USE_CLIP 0x08 -#define ECHO_CAN_USE_TX_HPF 0x10 -#define ECHO_CAN_USE_RX_HPF 0x20 -#define ECHO_CAN_DISABLE 0x40 - -/*! - G.168 echo canceller descriptor. This defines the working state for a line - echo canceller. -*/ -struct oslec_state; - -/*! Create a voice echo canceller context. - \param len The length of the canceller, in samples. - \return The new canceller context, or NULL if the canceller could not be created. -*/ -struct oslec_state *oslec_create(int len, int adaption_mode); - -/*! Free a voice echo canceller context. - \param ec The echo canceller context. -*/ -void oslec_free(struct oslec_state *ec); - -/*! Flush (reinitialise) a voice echo canceller context. - \param ec The echo canceller context. -*/ -void oslec_flush(struct oslec_state *ec); - -/*! Set the adaption mode of a voice echo canceller context. - \param ec The echo canceller context. - \param adapt The mode. -*/ -void oslec_adaption_mode(struct oslec_state *ec, int adaption_mode); - -void oslec_snapshot(struct oslec_state *ec); - -/*! Process a sample through a voice echo canceller. - \param ec The echo canceller context. - \param tx The transmitted audio sample. - \param rx The received audio sample. - \return The clean (echo cancelled) received sample. -*/ -int16_t oslec_update(struct oslec_state *ec, int16_t tx, int16_t rx); - -/*! Process to high pass filter the tx signal. - \param ec The echo canceller context. - \param tx The transmitted auio sample. - \return The HP filtered transmit sample, send this to your D/A. -*/ -int16_t oslec_hpf_tx(struct oslec_state *ec, int16_t tx); - -#endif /* __OSLEC_H */ |
