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view libtwamr/lsp_lsf.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 05a46720af0f
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             : lsp_lsf.h
*      Purpose          : Lsp_lsf:   Transformation lsp to lsf
*                       : Lsf_lsp:   Transformation lsf to lsp
*
********************************************************************************
*/
#ifndef lsp_lsf_h
#define lsp_lsf_h "$Id $"
 
/*
********************************************************************************
*                         INCLUDE FILES
********************************************************************************
*/
#include "typedef.h"
 
/*
********************************************************************************
*                         DEFINITION OF DATA TYPES
********************************************************************************
*/
 
/*
********************************************************************************
*                         DECLARATION OF PROTOTYPES
********************************************************************************
*/
void Lsf_lsp (
    Word16 lsf[],      /* (i)    : lsf[m] normalized (range: 0.0<=val<=0.5) */
    Word16 lsp[],      /* (o)    : lsp[m] (range: -1<=val<1)                */
    Word16 m           /* (i)    : LPC order                                */
);
void Lsp_lsf (
    Word16 lsp[],      /* (i)    : lsp[m] (range: -1<=val<1)                */
    Word16 lsf[],      /* (o)    : lsf[m] normalized (range: 0.0<=val<=0.5) */
    Word16 m           /* (i)    : LPC order                                */
);

#endif