FreeCalypso > hg > gsm-codec-lib
view libtwamr/inter_36.tab @ 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 | 838ed426bb76 |
| 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 : inter_36.tab * Purpose : Tables for interpolating the normalized correlation * with 1/3 or 1/6 resolution. * $Id $ * ******************************************************************************** */ #define FIR_SIZE (UP_SAMP_MAX*L_INTER_SRCH+1) /* 1/6 resolution interpolation filter (-3 dB at 3600 Hz) */ /* Note: The IS641 (7.4) 1/3 resolution filter is simply a subsampled version of the 1/6 resolution filter, i.e. it uses every second coefficient: inter_3[k] = inter_6[2*k], 0 <= k <= 3*L_INTER_SRCH */ static const Word16 inter_6[FIR_SIZE] = { 29519, 28316, 24906, 19838, 13896, 7945, 2755, -1127, -3459, -4304, -3969, -2899, -1561, -336, 534, 970, 1023, 823, 516, 220, 0, -131, -194, -215, 0 };