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Avoid variable-length array use in ff_acelp_lspd2lpc()

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Originally committed as revision 20496 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Vitor Sessak 2009-11-10 04:17:18 +00:00
parent dccda293a0
commit 00fa73f052
2 changed files with 8 additions and 1 deletions
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4
libavcodec/lsp.c
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@ -157,9 +157,11 @@ static void lsp2polyf(const double *lsp, double *f, int lp_half_order)
void ff_acelp_lspd2lpc(const double *lsp, float *lpc, int lp_half_order)
{
double pa[lp_half_order+1], qa[lp_half_order+1];
double pa[MAX_LP_HALF_ORDER+1], qa[MAX_LP_HALF_ORDER+1];
float *lpc2 = lpc + (lp_half_order << 1) - 1;
assert(lp_half_order <= MAX_LP_HALF_ORDER);
lsp2polyf(lsp, pa, lp_half_order);
lsp2polyf(lsp + 1, qa, lp_half_order);

5
libavcodec/lsp.h
View File

@ -80,11 +80,16 @@ void ff_acelp_lsp2lpc(int16_t* lp, const int16_t* lsp, int lp_half_order);
*/
void ff_acelp_lp_decode(int16_t* lp_1st, int16_t* lp_2nd, const int16_t* lsp_2nd, const int16_t* lsp_prev, int lp_order);
#define MAX_LP_HALF_ORDER 8
/**
* Reconstructs LPC coefficients from the line spectral pair frequencies.
*
* @param lsp line spectral pairs in cosine domain
* @param lpc linear predictive coding coefficients
* @param lp_half_order half the number of the amount of LPCs to be
* reconstructed, need to be smaller or equal to MAX_LP_HALF_ORDER
*
* @note buffers should have a minimux size of 2*lp_half_order elements.
*