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view libtwamr/a_refl.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 54f6bc41ed10
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             : a_refl.h
*      Purpose          : Convert from direct form coefficients to 
*                         reflection coefficients
*
********************************************************************************
*/
#ifndef a_refl_h
#define a_refl_h "$Id $"

/*
********************************************************************************
*                         INCLUDE FILES
********************************************************************************
*/
#include "typedef.h"

/*
********************************************************************************
*                         DEFINITION OF DATA TYPES
********************************************************************************
*/

/*
********************************************************************************
*                         DECLARATION OF PROTOTYPES
********************************************************************************
*/

/*************************************************************************
 *
 *   FUNCTION:  A_Refl()
 *
 *   PURPOSE: Convert from direct form coefficients to reflection coefficients
 *
 *   DESCRIPTION:
 *       Directform coeffs in Q12 are converted to 
 *       reflection coefficients Q15 
 *
 *************************************************************************/
void A_Refl(
   Word16 a[],	      /* i   : Directform coefficients */
   Word16 refl[]      /* o   : Reflection coefficients */
);

#endif