FreeCalypso > hg > gsm-codec-lib
view libtwamr/lsp_avg.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 | 9cd332a94c97 |
| 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 : lsp_avg.c * Purpose: : LSP averaging and history * ***************************************************************************** */ /* ***************************************************************************** * MODULE INCLUDE FILE AND VERSION ID ***************************************************************************** */ #include "namespace.h" #include "lsp_avg.h" /* ***************************************************************************** * INCLUDE FILES ***************************************************************************** */ #include "basic_op.h" #include "oper_32b.h" #include "no_count.h" #include "q_plsf5_tab.h" #include "memops.h" /* ***************************************************************************** * LOCAL VARIABLES AND TABLES ***************************************************************************** */ /* ***************************************************************************** * PUBLIC PROGRAM CODE ***************************************************************************** */ /* ************************************************************************** * * Function : lsp_avg_reset * Purpose : Resets state memory * ************************************************************************** */ void lsp_avg_reset (lsp_avgState *st) { Copy(mean_lsf, &st->lsp_meanSave[0], M); } /* ************************************************************************** * * Function : lsp_avg * Purpose : Calculate the LSP averages * ************************************************************************** */ void lsp_avg ( lsp_avgState *st, /* i/o : State struct Q15 */ Word16 *lsp /* i : state of the state machine Q15 */ ) { Word16 i; Word32 L_tmp; /* Q31 */ for (i = 0; i < M; i++) { /* mean = 0.84*mean */ L_tmp = L_deposit_h(st->lsp_meanSave[i]); L_tmp = L_msu(L_tmp, EXPCONST, st->lsp_meanSave[i]); /* Add 0.16 of newest LSPs to mean */ L_tmp = L_mac(L_tmp, EXPCONST, lsp[i]); /* Save means */ st->lsp_meanSave[i] = round(L_tmp); move16(); /* Q15 */ } return; }