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Staging: echo: coding style cleanups
Some remaining coding style cleanups to the header files and the echo.c file. Cc: David Rowe <david@rowetel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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Greg Kroah-Hartman
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c8b3953c4c
commit
56791f0a85
4 changed files with 67 additions and 63 deletions
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@ -220,12 +220,12 @@ static inline void lms_adapt_bg(struct oslec_state *ec, int clean,
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}
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#endif
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static __inline__ int top_bit(unsigned int bits)
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static inline int top_bit(unsigned int bits)
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{
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if (bits == 0)
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return -1;
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else
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return (int)fls((int32_t)bits)-1;
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return -1;
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else
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return (int)fls((int32_t)bits)-1;
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}
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struct oslec_state *oslec_create(int len, int adaption_mode)
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@ -466,7 +466,7 @@ int16_t oslec_update(struct oslec_state *ec, int16_t tx, int16_t rx)
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factor = (2^30) * (2^-2) * clean_bg_rx/P
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(30 - 2 - log2(P))
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(30 - 2 - log2(P))
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factor = clean_bg_rx 2 ----- (3)
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To avoid a divide we approximate log2(P) as top_bit(P),
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@ -28,13 +28,17 @@
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#ifndef __ECHO_H
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#define __ECHO_H
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/*! \page echo_can_page Line echo cancellation for voice
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/*
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Line echo cancellation for voice
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What does it do?
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\section echo_can_page_sec_1 What does it do?
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This module aims to provide G.168-2002 compliant echo cancellation, to remove
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electrical echoes (e.g. from 2-4 wire hybrids) from voice calls.
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\section echo_can_page_sec_2 How does it work?
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How does it work?
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The heart of the echo cancellor is FIR filter. This is adapted to match the
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echo impulse response of the telephone line. It must be long enough to
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adequately cover the duration of that impulse response. The signal transmitted
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@ -108,7 +112,8 @@ major mis-convergence in the adaption process. An assessment algorithm is
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needed which produces a fairly accurate result from a very short burst of far
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end energy.
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\section echo_can_page_sec_3 How do I use it?
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How do I use it?
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The echo cancellor processes both the transmit and receive streams sample by
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sample. The processing function is not declared inline. Unfortunately,
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cancellation requires many operations per sample, so the call overhead is only
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@ -118,7 +123,7 @@ a minor burden.
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#include "fir.h"
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#include "oslec.h"
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/*!
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/*
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G.168 echo canceller descriptor. This defines the working state for a line
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echo canceller.
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*/
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@ -23,14 +23,6 @@
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/*! \page fir_page FIR filtering
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\section fir_page_sec_1 What does it do?
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???.
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\section fir_page_sec_2 How does it work?
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???.
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*/
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#if !defined(_FIR_H_)
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#define _FIR_H_
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@ -62,10 +54,10 @@
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can.
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*/
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/*!
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16 bit integer FIR descriptor. This defines the working state for a single
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instance of an FIR filter using 16 bit integer coefficients.
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*/
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/*
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* 16 bit integer FIR descriptor. This defines the working state for a single
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* instance of an FIR filter using 16 bit integer coefficients.
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*/
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struct fir16_state_t {
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int taps;
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int curr_pos;
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@ -73,11 +65,11 @@ struct fir16_state_t {
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int16_t *history;
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};
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/*!
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32 bit integer FIR descriptor. This defines the working state for a single
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instance of an FIR filter using 32 bit integer coefficients, and filtering
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16 bit integer data.
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*/
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/*
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* 32 bit integer FIR descriptor. This defines the working state for a single
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* instance of an FIR filter using 32 bit integer coefficients, and filtering
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* 16 bit integer data.
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*/
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struct fir32_state_t {
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int taps;
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int curr_pos;
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@ -85,10 +77,10 @@ struct fir32_state_t {
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int16_t *history;
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};
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/*!
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Floating point FIR descriptor. This defines the working state for a single
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instance of an FIR filter using floating point coefficients and data.
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*/
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/*
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* Floating point FIR descriptor. This defines the working state for a single
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* instance of an FIR filter using floating point coefficients and data.
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*/
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struct fir_float_state_t {
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int taps;
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int curr_pos;
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@ -222,4 +214,3 @@ static inline int16_t fir32(struct fir32_state_t *fir, int16_t sample)
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}
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#endif
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/*- End of file ------------------------------------------------------------*/
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@ -27,8 +27,6 @@
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#ifndef __OSLEC_H
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#define __OSLEC_H
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/* TODO: document interface */
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/* Mask bits for the adaption mode */
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#define ECHO_CAN_USE_ADAPTION 0x01
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#define ECHO_CAN_USE_NLP 0x02
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@ -38,49 +36,59 @@
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#define ECHO_CAN_USE_RX_HPF 0x20
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#define ECHO_CAN_DISABLE 0x40
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/*!
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G.168 echo canceller descriptor. This defines the working state for a line
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echo canceller.
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*/
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/**
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* oslec_state: G.168 echo canceller descriptor.
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*
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* This defines the working state for a line echo canceller.
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*/
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struct oslec_state;
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/*! Create a voice echo canceller context.
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\param len The length of the canceller, in samples.
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\return The new canceller context, or NULL if the canceller could not be created.
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*/
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/**
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* oslec_create - Create a voice echo canceller context.
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* @len: The length of the canceller, in samples.
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* @return: The new canceller context, or NULL if the canceller could not be
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* created.
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*/
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struct oslec_state *oslec_create(int len, int adaption_mode);
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/*! Free a voice echo canceller context.
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\param ec The echo canceller context.
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*/
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/**
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* oslec_free - Free a voice echo canceller context.
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* @ec: The echo canceller context.
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*/
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void oslec_free(struct oslec_state *ec);
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/*! Flush (reinitialise) a voice echo canceller context.
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\param ec The echo canceller context.
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*/
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/**
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* oslec_flush - Flush (reinitialise) a voice echo canceller context.
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* @ec: The echo canceller context.
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*/
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void oslec_flush(struct oslec_state *ec);
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/*! Set the adaption mode of a voice echo canceller context.
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\param ec The echo canceller context.
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\param adapt The mode.
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*/
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/**
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* oslec_adaption_mode - set the adaption mode of a voice echo canceller context.
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* @ec The echo canceller context.
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* @adaption_mode: The mode.
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*/
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void oslec_adaption_mode(struct oslec_state *ec, int adaption_mode);
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void oslec_snapshot(struct oslec_state *ec);
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/*! Process a sample through a voice echo canceller.
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\param ec The echo canceller context.
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\param tx The transmitted audio sample.
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\param rx The received audio sample.
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\return The clean (echo cancelled) received sample.
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*/
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/**
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* oslec_update: Process a sample through a voice echo canceller.
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* @ec: The echo canceller context.
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* @tx: The transmitted audio sample.
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* @rx: The received audio sample.
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*
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* The return value is the clean (echo cancelled) received sample.
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*/
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int16_t oslec_update(struct oslec_state *ec, int16_t tx, int16_t rx);
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/*! Process to high pass filter the tx signal.
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\param ec The echo canceller context.
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\param tx The transmitted auio sample.
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\return The HP filtered transmit sample, send this to your D/A.
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*/
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/**
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* oslec_hpf_tx: Process to high pass filter the tx signal.
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* @ec: The echo canceller context.
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* @tx: The transmitted auio sample.
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*
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* The return value is the HP filtered transmit sample, send this to your D/A.
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*/
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int16_t oslec_hpf_tx(struct oslec_state *ec, int16_t tx);
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#endif /* __OSLEC_H */
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