FreeCalypso > hg > gsm-codec-lib
view libgsmefr/lsp_lsf.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 | 37e39cad5838 |
| children |
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/*-----------------------------------------------------* | Tables for function Lsf_lsp() and Lsp_lsf() | -----------------------------------------------------*/ /* table of cos(x) */ static const Word16 table[65] = { 32767, 32729, 32610, 32413, 32138, 31786, 31357, 30853, 30274, 29622, 28899, 28106, 27246, 26320, 25330, 24279, 23170, 22006, 20788, 19520, 18205, 16846, 15447, 14010, 12540, 11039, 9512, 7962, 6393, 4808, 3212, 1608, 0, -1608, -3212, -4808, -6393, -7962, -9512, -11039, -12540, -14010, -15447, -16846, -18205, -19520, -20788, -22006, -23170, -24279, -25330, -26320, -27246, -28106, -28899, -29622, -30274, -30853, -31357, -31786, -32138, -32413, -32610, -32729, (Word16) 0x8000 }; /* 0x8000 = -32768 (used to silence the compiler) */ /* slope used to compute y = acos(x) */ static const Word16 slope[64] = { -26887, -8812, -5323, -3813, -2979, -2444, -2081, -1811, -1608, -1450, -1322, -1219, -1132, -1059, -998, -946, -901, -861, -827, -797, -772, -750, -730, -713, -699, -687, -677, -668, -662, -657, -654, -652, -652, -654, -657, -662, -668, -677, -687, -699, -713, -730, -750, -772, -797, -827, -861, -901, -946, -998, -1059, -1132, -1219, -1322, -1450, -1608, -1811, -2081, -2444, -2979, -3813, -5323, -8812, -26887 };