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Move AMRNB lsf2lsp() function to common code for using in future AMRWB decoder.

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Patch by Marcelo Galvăo Póvoa

Originally committed as revision 25061 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Marcelo Galvăo Póvoa
2010-09-07 20:44:41 +00:00
committed by Vitor Sessak
parent b33451eeac
commit 1d96cc0865
3 changed files with 15 additions and 16 deletions
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8
libavcodec/lsp.c
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@@ -65,6 +65,14 @@ void ff_acelp_lsf2lsp(int16_t *lsp, const int16_t *lsf, int lp_order)
lsp[i] = ff_cos(lsf[i] * 20861 >> 15); // divide by PI and (0,13) -> (0,14)
}
void ff_acelp_lsf2lspd(double *lsp, const float *lsf, int lp_order)
{
int i;
for(i = 0; i < lp_order; i++)
lsp[i] = cos(2.0 * M_PI * lsf[i]);
}
/**
* \brief decodes polynomial coefficients from LSP
* \param f [out] decoded polynomial coefficients (-0x20000000 <= (3.22) <= 0x1fffffff)