FreeCalypso > hg > gsm-codec-lib
view libgsmefr/reorder.c @ 477:4c9222d95647
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 | 0faf23a9286f |
children |
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/************************************************************************* * * FUNCTION: Reorder_lsf() * * PURPOSE: To make sure that the LSFs are properly ordered and to keep a * certain minimum distance between adjacent LSFs. * * The LSFs are in the frequency range 0-0.5 and represented in Q15 * *************************************************************************/ #include "gsm_efr.h" #include "typedef.h" #include "namespace.h" #include "basic_op.h" #include "no_count.h" #include "sig_proc.h" void Reorder_lsf ( Word16 *lsf, /* (i/o) : vector of LSFs (range: 0<=val<=0.5) */ Word16 min_dist, /* (i) : minimum required distance */ Word16 n /* (i) : LPC order */ ) { Word16 i; Word16 lsf_min; lsf_min = min_dist; move16 (); for (i = 0; i < n; i++) { test (); if (lsf[i] < lsf_min) { lsf[i] = lsf_min; move16 (); } lsf_min = add (lsf[i], min_dist); } }