FreeCalypso > hg > gsm-codec-lib
view libtwamr/c_g_aver.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 | dc3b7caa59c4 |
| 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 : c_g_aver.h * Purpose : Background noise source charateristic detector (SCD) * ******************************************************************************** */ #ifndef c_g_aver_h #define c_g_aver_h "$Id $" /* ******************************************************************************** * INCLUDE FILES ******************************************************************************** */ #include "tw_amr.h" #include "typedef.h" #include "cnst.h" /* ******************************************************************************** * LOCAL VARIABLES AND TABLES ******************************************************************************** */ #define L_CBGAINHIST 7 /* ******************************************************************************** * DEFINITION OF DATA TYPES ******************************************************************************** */ typedef struct{ /* history vector of past synthesis speech energy */ Word16 cbGainHistory[L_CBGAINHIST]; /* state flags */ Word16 hangVar; /* counter; */ Word16 hangCount; /* counter; */ } Cb_gain_averageState; /* ******************************************************************************** * DECLARATION OF PROTOTYPES ******************************************************************************** */ /* ************************************************************************** * * Function : Cb_gain_average_reset * Purpose : Resets state memory * Returns : 0 on success * ************************************************************************** */ void Cb_gain_average_reset (Cb_gain_averageState *st); /* ************************************************************************** * * Function : Cb_gain_average * Purpose : Charaterice synthesis speech and detect background noise * Returns : background noise decision; 0 = bgn, 1 = no bgn * ************************************************************************** */ Word16 Cb_gain_average ( Cb_gain_averageState *st, /* i/o : State variables for CB gain avergeing */ enum Mode mode, /* i : AMR mode */ Word16 gain_code, /* i : CB gain Q1 */ Word16 lsp[], /* i : The LSP for the current frame Q15 */ Word16 lspAver[], /* i : The average of LSP for 8 frames Q15 */ Word16 bfi, /* i : bad frame indication flag */ Word16 prev_bf, /* i : previous bad frame indication flag */ Word16 pdfi, /* i : potential degraded bad frame ind flag */ Word16 prev_pdf, /* i : prev pot. degraded bad frame ind flag */ Word16 inBackgroundNoise, /* i : background noise decision */ Word16 voicedHangover /* i : # of frames after last voiced frame */ ); #endif