view libtwamr/memops.h @ 604:54f0f1b74c25

libgsmhr1 TFO: require BFI=0 and SID=0 for homing In order for a received frame to be recognized as DHF, we need not only the correct bit pattern, but also BFI=0 and SID=0. The BFI=0 requirement should be obvious, while the SID=0 requirement is needed only for HR codec. With FR and EFR, SID classification comes from the payload bits and no separate check is needed - but in HR we get an out-of-band SID ternary flag. When SID=1, no payload bits are used at all; when SID=2, we use only the first 33 bits of the payload. Therefore, it is proper to conditionalize DHF acceptance on SID=0. We already implemented this logic in the just finished full decoder; now bring TFO code into agreement.
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 04 Dec 2025 19:40:35 +0000
parents 8dfb7cbe6b59
children
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/*
 * The original code from ETSI uses its own Copy() and Set_zero()
 * functions, operating on Word16 elements.  Here we implement them
 * as static inline functions wrapping around memcpy and memset.
 */

#include <string.h>

static inline void Copy (
    const Word16 x[],  /* (i)  : input vector                               */
    Word16 y[],        /* (o)  : output vector                              */
    Word16 L           /* (i)  : vector length                              */
)
{
	memcpy(y, x, L * 2);
}

static inline void Set_zero (
    Word16 x[],        /* (o)  : vector to clear                            */
    Word16 L           /* (i)  : length of vector                           */
)
{
	memset(x, 0, L * 2);
}