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amrwb: remove duplicate arguments from extrapolate_isf().

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Prevents warnings because the dst and src overlap (are the same) in the
memcpy() inside the function.

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
This commit is contained in:
Ronald S. Bultje 2012-03-01 15:44:25 -08:00
parent 154b8bb800
commit 9d87374ec0
1 changed files with 12 additions and 13 deletions
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25
libavcodec/amrwbdec.c
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@ -898,10 +898,10 @@ static float auto_correlation(float *diff_isf, float mean, int lag)
* Extrapolate a ISF vector to the 16kHz range (20th order LP)
* used at mode 6k60 LP filter for the high frequency band.
*
* @param[out] out Buffer for extrapolated isf
* @param[in] isf Input isf vector
* @param[out] isf Buffer for extrapolated isf; contains LP_ORDER
* values on input
*/
static void extrapolate_isf(float out[LP_ORDER_16k], float isf[LP_ORDER])
static void extrapolate_isf(float isf[LP_ORDER_16k])
{
float diff_isf[LP_ORDER - 2], diff_mean;
float *diff_hi = diff_isf - LP_ORDER + 1; // diff array for extrapolated indexes
@ -909,8 +909,7 @@ static void extrapolate_isf(float out[LP_ORDER_16k], float isf[LP_ORDER])
float est, scale;
int i, i_max_corr;
memcpy(out, isf, (LP_ORDER - 1) * sizeof(float));
out[LP_ORDER_16k - 1] = isf[LP_ORDER - 1];
isf[LP_ORDER_16k - 1] = isf[LP_ORDER - 1];
/* Calculate the difference vector */
for (i = 0; i < LP_ORDER - 2; i++)
@ -931,16 +930,16 @@ static void extrapolate_isf(float out[LP_ORDER_16k], float isf[LP_ORDER])
i_max_corr++;
for (i = LP_ORDER - 1; i < LP_ORDER_16k - 1; i++)
out[i] = isf[i - 1] + isf[i - 1 - i_max_corr]
isf[i] = isf[i - 1] + isf[i - 1 - i_max_corr]
- isf[i - 2 - i_max_corr];
/* Calculate an estimate for ISF(18) and scale ISF based on the error */
est = 7965 + (out[2] - out[3] - out[4]) / 6.0;
scale = 0.5 * (FFMIN(est, 7600) - out[LP_ORDER - 2]) /
(out[LP_ORDER_16k - 2] - out[LP_ORDER - 2]);
est = 7965 + (isf[2] - isf[3] - isf[4]) / 6.0;
scale = 0.5 * (FFMIN(est, 7600) - isf[LP_ORDER - 2]) /
(isf[LP_ORDER_16k - 2] - isf[LP_ORDER - 2]);
for (i = LP_ORDER - 1; i < LP_ORDER_16k - 1; i++)
diff_hi[i] = scale * (out[i] - out[i - 1]);
diff_hi[i] = scale * (isf[i] - isf[i - 1]);
/* Stability insurance */
for (i = LP_ORDER; i < LP_ORDER_16k - 1; i++)
@ -952,11 +951,11 @@ static void extrapolate_isf(float out[LP_ORDER_16k], float isf[LP_ORDER])
}
for (i = LP_ORDER - 1; i < LP_ORDER_16k - 1; i++)
out[i] = out[i - 1] + diff_hi[i] * (1.0f / (1 << 15));
isf[i] = isf[i - 1] + diff_hi[i] * (1.0f / (1 << 15));
/* Scale the ISF vector for 16000 Hz */
for (i = 0; i < LP_ORDER_16k - 1; i++)
out[i] *= 0.8;
isf[i] *= 0.8;
}
/**
@ -1003,7 +1002,7 @@ static void hb_synthesis(AMRWBContext *ctx, int subframe, float *samples,
ff_weighted_vector_sumf(e_isf, isf_past, isf, isfp_inter[subframe],
1.0 - isfp_inter[subframe], LP_ORDER);
extrapolate_isf(e_isf, e_isf);
extrapolate_isf(e_isf);
e_isf[LP_ORDER_16k - 1] *= 2.0;
ff_acelp_lsf2lspd(e_isp, e_isf, LP_ORDER_16k);