FreeCalypso > hg > gsm-codec-lib
view libtwamr/lsp_avg.h @ 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.h * Purpose: : LSP averaging and history * The LSPs are averaged over 8 frames * ******************************************************************************** */ #ifndef lsp_avg_h #define lsp_avg_h "$Id $" /* ******************************************************************************** * INCLUDE FILES ******************************************************************************** */ #include "typedef.h" #include "cnst.h" /* ******************************************************************************** * LOCAL VARIABLES AND TABLES ******************************************************************************** */ #define EXPCONST 5243 /* 0.16 in Q15 */ /* ******************************************************************************** * DEFINITION OF DATA TYPES ******************************************************************************** */ typedef struct { Word16 lsp_meanSave[M]; /* Averaged LSPs saved for efficiency */ } lsp_avgState; /* ******************************************************************************** * DECLARATION OF PROTOTYPES ******************************************************************************** */ /* ************************************************************************** * * Function : lsp_history_reset * Purpose : Resets state memory * ************************************************************************** */ void lsp_avg_reset ( lsp_avgState *state ); /* ************************************************************************** * * Function : lsp_avg * Purpose : Calculate the LSP averages * ************************************************************************** */ void lsp_avg ( lsp_avgState *st, /* i/o : State struct Q15 */ Word16 *lsp /* i : LSP vector Q15 */ ); #endif