FreeCalypso > hg > gsm-codec-lib
view libtwamr/cor_h.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 | 5401aaf7acb0 |
| 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 : cor_h.h * Purpose : correlation functions for codebook search * ***************************************************************************** */ /* ***************************************************************************** * MODULE INCLUDE FILE AND VERSION ID ***************************************************************************** */ #ifndef cor_h_h #define cor_h_h "@(#)$Id $" /* ***************************************************************************** * INCLUDE FILES ***************************************************************************** */ #include "typedef.h" #include "cnst.h" /* ***************************************************************************** * DECLARATION OF PROTOTYPES ***************************************************************************** */ void cor_h_x ( Word16 h[], /* (i) : impulse response of weighted synthesis filter */ Word16 x[], /* (i) : target */ Word16 dn[], /* (o) : correlation between target and h[] */ Word16 sf /* (i) : scaling factor: 2 for 12.2, 1 for 7.4 */ ); void cor_h_x2 ( Word16 h[], /* (i) : impulse response of weighted synthesis filter */ Word16 x[], /* (i) : target */ Word16 dn[], /* (o) : correlation between target and h[] */ Word16 sf, /* (i) : scaling factor: 2 for 12.2, 1 for 7.4 */ Word16 nb_track,/* (i) : the number of ACB tracks */ Word16 step /* (i) : step size from one pulse position to the next in one track */ ); void cor_h ( Word16 h[], /* (i) : impulse response of weighted synthesis filter */ Word16 sign[], /* (i) : sign of d[n] */ Word16 rr[][L_CODE] /* (o) : matrix of autocorrelation */ ); #endif