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lsp: convert variable-length arrays to fixed size

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Max LP order is defined to be 16, fixed-size buffers are OK.

Originally committed as revision 23795 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Måns Rullgård 2010-06-26 14:34:12 +00:00
parent 5228bcd870
commit 164d166e85
2 changed files with 4 additions and 3 deletions
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6
libavcodec/lsp.c
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@ -90,8 +90,8 @@ static void lsp2poly(int* f, const int16_t* lsp, int lp_half_order)
void ff_acelp_lsp2lpc(int16_t* lp, const int16_t* lsp, int lp_half_order)
{
int i;
int f1[lp_half_order+1]; // (3.22)
int f2[lp_half_order+1]; // (3.22)
int f1[MAX_LP_HALF_ORDER+1]; // (3.22)
int f2[MAX_LP_HALF_ORDER+1]; // (3.22)
lsp2poly(f1, lsp , lp_half_order);
lsp2poly(f2, lsp+1, lp_half_order);
@ -111,7 +111,7 @@ 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)
{
int16_t lsp_1st[lp_order]; // (0.15)
int16_t lsp_1st[MAX_LP_ORDER]; // (0.15)
int i;
/* LSP values for first subframe (3.2.5 of G.729, Equation 24)*/

1
libavcodec/lsp.h
View File

@ -82,6 +82,7 @@ void ff_acelp_lp_decode(int16_t* lp_1st, int16_t* lp_2nd, const int16_t* lsp_2nd
#define MAX_LP_HALF_ORDER 8
#define MAX_LP_ORDER (2*MAX_LP_HALF_ORDER)
/**
* Reconstructs LPC coefficients from the line spectral pair frequencies.