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view src/cs/layer1/gtt_include/ctm/viterbi.h @ 275:79cfefc1e2b4

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audio mode load: gracefully handle mode files of wrong AEC version Unfortunately our change of enabling L1_NEW_AEC (which is necessary in order to bring our Calypso ARM fw into match with the underlying DSP reality) brings along a change in the audio mode file binary format and file size - all those new tunable AEC parameters do need to be stored somewhere, after all. But we already have existing mode files in the old format, and setting AEC config to garbage when loading old audio modes (which is what would happen without the present change) is not an appealing proposition. The solution implemented in the present change is as follows: the audio mode loading code checks the file size, and if it differs from the active version of T_AUDIO_MODE, the T_AUDIO_AEC_CFG structure is cleared - set to the default (disabled AEC) for the compiled type of AEC. We got lucky in that this varying T_AUDIO_AEC_CFG structure sits at the end of T_AUDIO_MODE!
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 30 Jul 2021 02:55:48 +0000
parents 4e78acac3d88
children
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/*
*******************************************************************************
*
*      COPYRIGHT (C) 2000 BY ERICSSON EUROLAB DEUTSCHLAND GmbH
*
*      The program(s) may be used and/or copied only with the
*      written permission from Ericsson or in accordance
*      with the terms and conditions stipulated in the agreement or
*      contract under which the program(s) have been supplied.
*
*******************************************************************************
*
*      File             : viterbi.h
*      Purpose          : Header file for viterbi.c
*      Author           : Francisco Javier Gil Gomez
*
*      Revision history
*
*      $Log: $
*
*******************************************************************************
*/

#ifndef viterbi_h
#define viterbi_h "$Id: $"

#include <stdio.h>
#include <math.h>

#include "conv_poly.h"   /* definition of viterbi_t */


/***********************************************************************/
/* viterbi_init()                                                      */
/* **************                                                      */
/* Initialization of the Viterbi decoder.                              */
/*                                                                     */
/* output variables:                                                   */
/* *viterbi_state   initialized state variable of the decoder          */
/*                                                                     */
/***********************************************************************/

void viterbi_init(viterbi_t* viterbi_state);


/***********************************************************************/
/* viterbi_reinit()                                                    */
/* ****************                                                    */
/* Re-Initialization of the Viterbi decoder. This function should be   */
/* used for re-setting a Viterbi decoder that has already been         */
/* initialized. In contrast to viterbi_init(), this reinit function    */
/* does not calculate the values of all members of viterbi_state that  */
/* do not change during the execution of the Viterbi algorithm.        */
/*                                                                     */
/* output variables:                                                   */
/* *viterbi_state   initialized state variable of the decoder          */
/*                                                                     */
/***********************************************************************/

void viterbi_reinit(viterbi_t* viterbi_state);


/***********************************************************************/
/* viterbi_exec()                                                      */
/* **************                                                      */
/* Execution of the Viterbi decoder                                    */
/*                                                                     */
/* input variables:                                                    */
/* inputword            Vector with gross bits                         */
/* length_input         Number of valid gross bits in vector inputword.*/
/*                      length_input must be an integer multiple of    */
/*                      CHC_RATE                                       */
/*                                                                     */
/* output variables:                                                   */
/* out                  Vector with the decoded net bits. The net bits */
/*                      are either 0 or 1.                             */
/* *num_valid_out_bits  Number of valid bits in vector out             */
/*                                                                     */
/* input/output variables:                                             */
/* *viterbi_state       State variable of the decoder                  */
/*                                                                     */
/***********************************************************************/

void viterbi_exec(WORD16*  inputword, WORD16  length_input, 
                  WORD16*  out,       WORD16* num_valid_out_bits,
                  viterbi_t* viterbi_state);

#endif