FreeCalypso > hg > gsm-codec-lib
view libtwamr/ph_disp.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 | bde9f5804670 |
| 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 : ph_disp.h * Purpose : Phase dispersion of excitation signal * ******************************************************************************** */ #ifndef ph_disp_h #define ph_disp_h "$Id $" /* ******************************************************************************** * INCLUDE FILES ******************************************************************************** */ #include "tw_amr.h" #include "typedef.h" /* ******************************************************************************** * LOCAL VARIABLES AND TABLES ******************************************************************************** */ #define PHDGAINMEMSIZE 5 #define PHDTHR1LTP 9830 /* 0.6 in Q14 */ #define PHDTHR2LTP 14746 /* 0.9 in Q14 */ #define ONFACTPLUS1 16384 /* 2.0 in Q13 */ #define ONLENGTH 2 /* ******************************************************************************** * DEFINITION OF DATA TYPES ******************************************************************************** */ typedef struct { Word16 gainMem[PHDGAINMEMSIZE]; Word16 prevState; Word16 prevCbGain; Word16 lockFull; Word16 onset; } ph_dispState; /* ******************************************************************************** * DECLARATION OF PROTOTYPES ******************************************************************************** */ /************************************************************************* * * Function: ph_disp_reset * Purpose: Initializes state memory * ************************************************************************** */ void ph_disp_reset (ph_dispState *state); /************************************************************************* * * Function: ph_disp_lock * Purpose: mark phase dispersion as locked in state struct * ************************************************************************** */ void ph_disp_lock (ph_dispState *state); /************************************************************************* * * Function: ph_disp_release * Purpose: mark phase dispersion as unlocked in state struct * ************************************************************************** */ void ph_disp_release (ph_dispState *state); /************************************************************************* * * Function: ph_disp * Purpose: perform phase dispersion according to the specified codec * mode and computes total excitation for synthesis part * if decoder * ************************************************************************** */ void ph_disp ( ph_dispState *state, /* i/o : State struct */ enum Mode mode, /* i : codec mode */ Word16 x[], /* i/o Q0 : in: LTP excitation signal */ /* out: total excitation signal */ Word16 cbGain, /* i Q1 : Codebook gain */ Word16 ltpGain, /* i Q14 : LTP gain */ Word16 inno[], /* i Q13 : Innovation vector (Q12 for 12.2) */ Word16 pitch_fac, /* i Q14 : pitch factor used to scale the LTP excitation (Q13 for 12.2) */ Word16 tmp_shift /* i Q0 : shift factor applied to sum of scaled LTP ex & innov. before rounding */ ); #endif