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Make lsp2polyf() function non-static for upcoming usage in SIPR

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Originally committed as revision 20602 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Vitor Sessak 2009-11-24 16:58:50 +00:00
parent d2b34efe22
commit 691a4232ee
2 changed files with 15 additions and 13 deletions
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16
libavcodec/lsp.c
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@ -128,17 +128,7 @@ void ff_acelp_lp_decode(int16_t* lp_1st, int16_t* lp_2nd, const int16_t* lsp_2nd
ff_acelp_lsp2lpc(lp_2nd, lsp_2nd, lp_order >> 1); ff_acelp_lsp2lpc(lp_2nd, lsp_2nd, lp_order >> 1);
} }
/** void ff_lsp2polyf(const double *lsp, double *f, int lp_half_order)
* Computes the Pa / (1 + z(-1)) or Qa / (1 - z(-1)) coefficients
* needed for LSP to LPC conversion.
* We only need to calculate the 6 first elements of the polynomial.
*
* @param lsp line spectral pairs in cosine domain
* @param f [out] polynomial input/output as a vector
*
* TIA/EIA/IS-733 2.4.3.3.5-1/2
*/
static void lsp2polyf(const double *lsp, double *f, int lp_half_order)
{ {
int i, j; int i, j;
@ -162,8 +152,8 @@ void ff_acelp_lspd2lpc(const double *lsp, float *lpc, int lp_half_order)
assert(lp_half_order <= MAX_LP_HALF_ORDER); assert(lp_half_order <= MAX_LP_HALF_ORDER);
lsp2polyf(lsp, pa, lp_half_order); ff_lsp2polyf(lsp, pa, lp_half_order);
lsp2polyf(lsp + 1, qa, lp_half_order); ff_lsp2polyf(lsp + 1, qa, lp_half_order);
while (lp_half_order--) { while (lp_half_order--) {
double paf = pa[lp_half_order+1] + pa[lp_half_order]; double paf = pa[lp_half_order+1] + pa[lp_half_order];

12
libavcodec/lsp.h
View File

@ -104,4 +104,16 @@ void ff_acelp_lspd2lpc(const double *lsp, float *lpc, int lp_half_order);
*/ */
void ff_sort_nearly_sorted_floats(float *vals, int len); void ff_sort_nearly_sorted_floats(float *vals, int len);
/**
* Computes the Pa / (1 + z(-1)) or Qa / (1 - z(-1)) coefficients
* needed for LSP to LPC conversion.
* We only need to calculate the 6 first elements of the polynomial.
*
* @param lsp line spectral pairs in cosine domain
* @param f [out] polynomial input/output as a vector
*
* TIA/EIA/IS-733 2.4.3.3.5-1/2
*/
void ff_lsp2polyf(const double *lsp, double *f, int lp_half_order);
#endif /* AVCODEC_LSP_H */ #endif /* AVCODEC_LSP_H */