FreeCalypso > hg > gsm-codec-lib
view libtwamr/dtx_enc.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 | 5a1d18542f8a |
| children |
line wrap: on
line source
/* ******************************************************************************** * * 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 : dtx_enc.h * Purpose : DTX mode computation of SID parameters * ******************************************************************************** */ #ifndef dtx_enc_h #define dtx_enc_h "$Id $" /* ******************************************************************************** * INCLUDE FILES ******************************************************************************** */ #include "tw_amr.h" #include "typedef.h" #include "cnst.h" #include "q_plsf.h" #include "gc_pred.h" #include "dtx_common.h" /* ******************************************************************************** * DEFINITION OF DATA TYPES ******************************************************************************** */ typedef struct { Word16 lsp_hist[M * DTX_HIST_SIZE]; Word16 log_en_hist[DTX_HIST_SIZE]; Word16 hist_ptr; Word16 log_en_index; Word16 init_lsf_vq_index; Word16 lsp_index[3]; /* DTX handler stuff */ Word16 dtxHangoverCount; Word16 decAnaElapsedCount; } dtx_encState; /* ******************************************************************************** * DECLARATION OF PROTOTYPES ******************************************************************************** */ /* ************************************************************************** * * Function : dtx_enc_reset * Purpose : Resets state memory * Returns : 0 on success * ************************************************************************** */ void dtx_enc_reset (dtx_encState *st); /* ************************************************************************** * * Function : dtx_enc * Purpose : * Description : * ************************************************************************** */ int dtx_enc(dtx_encState *st, /* i/o : State struct */ Word16 computeSidFlag, /* i : compute SID */ Q_plsfState *qSt, /* i/o : Qunatizer state struct */ gc_predState* predState, /* i/o : State struct */ Word16 **anap /* o : analysis parameters */ ); /* ************************************************************************** * * Function : dtx_buffer * Purpose : handles the DTX buffer * ************************************************************************** */ int dtx_buffer(dtx_encState *st, /* i/o : State struct */ Word16 lsp_new[], /* i : LSP vector */ Word16 speech[] /* i : speech samples */ ); /* ************************************************************************** * * Function : tx_dtx_handler * Purpose : adds extra speech hangover to analyze speech on the decoding side. * Description : returns 1 when a new SID analysis may be made * otherwise it adds the appropriate hangover after a sequence * with out updates of SID parameters . * ************************************************************************** */ Word16 tx_dtx_handler(dtx_encState *st, /* i/o : State struct */ Word16 vadFlag, /* i : vad control variable */ enum Mode *usedMode /* o : mode changed or not */ ); #endif