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view libtwamr/calc_cor.h @ 477:4c9222d95647

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libtwamr encoder: always emit frame->mode = mode; In the original implementation of amr_encode_frame(), the 'mode' member of the output struct was set to 0xFF if the output frame type is TX_NO_DATA. This design was made to mimic the mode field (16-bit word) being set to 0xFFFF (or -1) in 3GPP test sequence format - but nothing actually depends on this struct member being set in any way, and amr_frame_to_tseq() generates the needed 0xFFFF on its own, based on frame->type being equal to TX_NO_DATA. It is simpler and more efficient to always set frame->mode to the actual encoding mode in amr_encode_frame(), and this new behavior has already been documented in doc/AMR-library-API description in anticipation of the present change.
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 18 May 2024 22:30:42 +0000
parents 67c31802392b
children
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/*
********************************************************************************
*
*      GSM AMR-NB speech codec   R98   Version 7.6.0   December 12, 2001
*                                R99   Version 3.3.0                
*                                REL-4 Version 4.1.0                
*
********************************************************************************
*
*      File             : calc_cor.h
*      Purpose          : Calculate all correlations for prior the OL LTP 
*
********************************************************************************
*/
#ifndef calc_cor_h
#define calc_cor_h "$Id $"
 
/*
********************************************************************************
*                         INCLUDE FILES
********************************************************************************
*/
#include "typedef.h"

/*
********************************************************************************
*                         DECLARATION OF PROTOTYPES
********************************************************************************
*/
/*************************************************************************
 *
 *  FUNCTION: comp_corr 
 *
 *  PURPOSE: Calculate all correlations of scal_sig[] in a given delay
 *           range.
 *
 *  DESCRIPTION:
 *      The correlation is given by
 *           cor[t] = <scal_sig[n], scal_sig[n-t]>,  t=lag_min,...,lag_max
 *      The functions outputs all correlations in the given range 
 *
 *************************************************************************/
void comp_corr (Word16 scal_sig[],  /* i   : scaled signal.                     */
                Word16 L_frame,     /* i   : length of frame to compute pitch   */
                Word16 lag_max,     /* i   : maximum lag                        */
                Word16 lag_min,     /* i   : minimum lag                        */
                Word32 corr[]       /* o   : correlation of selected lag        */
                );
#endif