FreeCalypso > hg > gsm-codec-lib
view libgsmefr/preemph.c @ 128:a5ffec18e4cd
test programs: use printf %d format for codec parameters
Even though all codec params (both FR and EFR) are small unsigned integers,
we use signed int16_t data type for both, for interface reasons: in the
case of FR it's the gsm_signal type of libgsm, and in the case of EFR
it's the Word16 type of ETSI codec guts. Therefore, the correct printf
format is %d, not %u, when the objective is to see what's in the variables
(what the compiler sees) and catch any bugs.
author | Mychaela Falconia <falcon@freecalypso.org> |
---|---|
date | Sun, 11 Dec 2022 04:00:13 +0000 |
parents | 9aef9e54b19d |
children |
line wrap: on
line source
/*---------------------------------------------------------------------* * routine preemphasis() * * ~~~~~~~~~~~~~~~~~~~~~ * * Preemphasis: filtering through 1 - g z^-1 * *---------------------------------------------------------------------*/ #include "gsm_efr.h" #include "typedef.h" #include "namespace.h" #include "basic_op.h" #include "no_count.h" #include "sig_proc.h" #include "cnst.h" #include "dec_state.h" void preemphasis ( struct EFR_decoder_state *st, Word16 *signal, /* (i/o) : input signal overwritten by the output */ Word16 g, /* (i) : preemphasis coefficient */ Word16 L /* (i) : size of filtering */ ) { Word16 *p1, *p2, temp, i; p1 = signal + L - 1; p2 = p1 - 1; temp = *p1; for (i = 0; i <= L - 2; i++) { *p1 = sub (*p1, mult (g, *p2--)); p1--; } *p1 = sub (*p1, mult (g, st->mem_pre)); st->mem_pre = temp; return; }