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view libtwamr/d2_9pf.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 2303ba1490dd
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             : d2_9pf.h
*      Purpose          : Algebraic codebook decoder
*
*****************************************************************************
*/
#ifndef d2_9pf_h
#define d2_9pf_h "$Id $"

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

/*
*****************************************************************************
*                         LOCAL VARIABLES AND TABLES
*****************************************************************************
*/
 
/*
*****************************************************************************
*                         DEFINITION OF DATA TYPES
*****************************************************************************
*/

/*
*****************************************************************************
*                         DECLARATION OF PROTOTYPES
*****************************************************************************
*/
/*************************************************************************
 *
 *  FUNCTION:  decode_2i40_9bits (decod_ACELP())
 *
 *  PURPOSE:   Algebraic codebook decoder for 2 pulses coded with 9 bits
 *
 *************************************************************************/

void decode_2i40_9bits(
    Word16 subNr,  /* i : subframe number                          */
    Word16 sign,   /* i : signs of 2 pulses.                       */
    Word16 index,  /* i : Positions of the 2 pulses.               */
    Word16 cod[]   /* o : algebraic (fixed) codebook excitation    */
);

#endif