FreeCalypso > hg > gsm-codec-lib
view libtwamr/pitch_fr.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 | be8edf9e6bc1 |
| 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 : pitch_fr.h * Purpose : Find the pitch period with 1/3 or 1/6 subsample * : resolution (closed loop). * ******************************************************************************** */ #ifndef pitch_fr_h #define pitch_fr_h "$Id $" /* ******************************************************************************** * INCLUDE FILES ******************************************************************************** */ #include "tw_amr.h" #include "typedef.h" /* ******************************************************************************** * DEFINITION OF DATA TYPES ******************************************************************************** */ typedef struct { Word16 T0_prev_subframe; /* integer pitch lag of previous sub-frame */ } Pitch_frState; /* ******************************************************************************** * DECLARATION OF PROTOTYPES ******************************************************************************** */ void Pitch_fr_reset (Pitch_frState *st); /* reset of pre processing state (i.e. set state memory to zero) returns 0 on success */ Word16 Pitch_fr ( /* o : pitch period (integer) */ Pitch_frState *st, /* i/o : State struct */ enum Mode mode, /* i : codec mode */ Word16 T_op[], /* i : open loop pitch lags */ Word16 exc[], /* i : excitation buffer */ Word16 xn[], /* i : target vector */ Word16 h[], /* i : impulse response of synthesis and weighting filters */ Word16 L_subfr, /* i : Length of subframe */ Word16 i_subfr, /* i : subframe offset */ Word16 *pit_frac, /* o : pitch period (fractional) */ Word16 *resu3, /* o : subsample resolution 1/3 (=1) or 1/6 (=0) */ Word16 *ana_index /* o : index of encoding */ ); #endif