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view libtwamr/set_sign.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 15c354f75110
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             : set_sign.h
*      Purpose          : Builds sign vector according to "dn[]" and "cn[]".
*
********************************************************************************
*/
/*
********************************************************************************
*                         MODULE INCLUDE FILE AND VERSION ID
********************************************************************************
*/
#ifndef set_sign_h
#define set_sign_h "@(#)$Id $"
/*
********************************************************************************
*                         INCLUDE FILES
********************************************************************************
*/
#include "typedef.h"
 
/*
********************************************************************************
*                         DECLARATION OF PROTOTYPES
********************************************************************************
*/
void set_sign(Word16 dn[],   /* i/o : correlation between target and h[]    */
              Word16 sign[], /* o   : sign of dn[]                          */
              Word16 dn2[],  /* o   : maximum of correlation in each track. */
              Word16 n       /* i   : # of maximum correlations in dn2[]    */
);

void set_sign12k2 (
    Word16 dn[],      /* i/o : correlation between target and h[]         */
    Word16 cn[],      /* i   : residual after long term prediction        */
    Word16 sign[],    /* o   : sign of d[n]                               */
    Word16 pos_max[], /* o   : position of maximum correlation            */
    Word16 nb_track,  /* i   : number of tracks tracks                    */        
    Word16 ipos[],    /* o   : starting position for each pulse           */
    Word16 step       /* i   : the step size in the tracks                */        
);

#endif