FreeCalypso > hg > gsm-codec-lib
view libtwamr/pstfilt.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 | 59655481e45b |
| 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 : pstfilt.h * Purpose : Performs adaptive postfiltering on the synthesis * : speech * ******************************************************************************** */ #ifndef pstfilt_h #define pstfilt_h "$Id $" /* ******************************************************************************** * INCLUDE FILES ******************************************************************************** */ #include "tw_amr.h" #include "typedef.h" #include "cnst.h" #include "preemph.h" #include "agc.h" /* ******************************************************************************** * DEFINITION OF DATA TYPES ******************************************************************************** */ typedef struct{ Word16 res2[L_SUBFR]; Word16 mem_syn_pst[M]; preemphasisState preemph_state; agcState agc_state; Word16 synth_buf[M + L_FRAME]; } Post_FilterState; /* ******************************************************************************** * DECLARATION OF PROTOTYPES ******************************************************************************** */ void Post_Filter_reset (Post_FilterState *st); /* reset post filter (i.e. set state memory to zero) returns 0 on success */ int Post_Filter ( Post_FilterState *st, /* i/o : post filter states */ enum Mode mode, /* i : AMR mode */ Word16 *syn, /* i/o : synthesis speech (postfiltered is output) */ Word16 *Az_4 /* i : interpolated LPC parameters in all subfr. */ ); /* filters the signal syn using the parameters in Az_4 to calculate filter coefficients. The filter must be set up using Post_Filter_init prior to the first call to Post_Filter. Post_FilterState is updated to mirror the current state of the filter return 0 on success */ #endif