FreeCalypso > hg > gsm-codec-lib
view libtwamr/cl_ltp.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 | 85e9768d497f |
| 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 : cl_ltp.h * Purpose : Closed-loop fractional pitch search * ******************************************************************************** */ #ifndef cl_ltp_h #define cl_ltp_h "$Id $" /* ******************************************************************************** * INCLUDE FILES ******************************************************************************** */ #include "tw_amr.h" #include "typedef.h" #include "pitch_fr.h" #include "ton_stab.h" /* ******************************************************************************** * LOCAL VARIABLES AND TABLES ******************************************************************************** */ /* ******************************************************************************** * DEFINITION OF DATA TYPES ******************************************************************************** */ /* state variable */ typedef struct { Pitch_frState pitchSt; } clLtpState; /* ******************************************************************************** * DECLARATION OF PROTOTYPES ******************************************************************************** */ void cl_ltp_reset (clLtpState *st); /* reset of pre processing state (i.e. set state memory to zero) returns 0 on success */ int cl_ltp( clLtpState *clSt, /* i/o : State struct */ tonStabState *tonSt, /* i/o : State struct */ enum Mode mode, /* i : coder mode */ Word16 frameOffset, /* i : Offset to subframe */ Word16 T_op[], /* i : Open loop pitch lags */ Word16 *h1, /* i : Impulse response vector Q12 */ Word16 *exc, /* i/o : Excitation vector Q0 */ Word16 res2[], /* i/o : Long term prediction residual Q0 */ Word16 xn[], /* i : Target vector for pitch search Q0 */ Word16 lsp_flag, /* i : LSP resonance flag */ Word16 xn2[], /* o : Target vector for codebook search Q0 */ Word16 y1[], /* o : Filtered adaptive excitation Q0 */ Word16 *T0, /* o : Pitch delay (integer part) */ Word16 *T0_frac, /* o : Pitch delay (fractional part) */ Word16 *gain_pit, /* o : Pitch gain Q14 */ Word16 g_coeff[], /* o : Correlations between xn, y1, & y2 */ Word16 **anap, /* o : Analysis parameters */ Word16 *gp_limit /* o : pitch gain limit */ ); #endif