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g723.1: make autocorr_max() work on an arbitrary buffer

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Signed-off-by: Mans Rullgard <mans@mansr.com>
This commit is contained in:
Mans Rullgard 2012-08-11 12:16:53 +01:00
parent 3716105103
commit 783da0d696
1 changed files with 5 additions and 6 deletions
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11
libavcodec/g723_1.c
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@ -615,18 +615,17 @@ static void gen_acb_excitation(int16_t *vector, int16_t *prev_excitation,
/**
* Estimate maximum auto-correlation around pitch lag.
*
* @param p the context
* @param buf buffer with offset applied
* @param offset offset of the excitation vector
* @param ccr_max pointer to the maximum auto-correlation
* @param pitch_lag decoded pitch lag
* @param length length of autocorrelation
* @param dir forward lag(1) / backward lag(-1)
*/
static int autocorr_max(G723_1_Context *p, int offset, int *ccr_max,
static int autocorr_max(const int16_t *buf, int offset, int *ccr_max,
int pitch_lag, int length, int dir)
{
int limit, ccr, lag = 0;
int16_t *buf = p->excitation + offset;
int i;
pitch_lag = FFMIN(PITCH_MAX - 3, pitch_lag);
@ -721,9 +720,9 @@ static void comp_ppf_coeff(G723_1_Context *p, int offset, int pitch_lag,
*/
int energy[5] = {0, 0, 0, 0, 0};
int16_t *buf = p->excitation + offset;
int fwd_lag = autocorr_max(p, offset, &energy[1], pitch_lag,
int fwd_lag = autocorr_max(buf, offset, &energy[1], pitch_lag,
SUBFRAME_LEN, 1);
int back_lag = autocorr_max(p, offset, &energy[3], pitch_lag,
int back_lag = autocorr_max(buf, offset, &energy[3], pitch_lag,
SUBFRAME_LEN, -1);
ppf->index = 0;
@ -800,7 +799,7 @@ static int comp_interp_index(G723_1_Context *p, int pitch_lag,
/* Compute maximum backward cross-correlation */
ccr = 0;
index = autocorr_max(p, offset, &ccr, pitch_lag, SUBFRAME_LEN * 2, -1);
index = autocorr_max(buf, offset, &ccr, pitch_lag, SUBFRAME_LEN * 2, -1);
ccr = av_sat_add32(ccr, 1 << 15) >> 16;
/* Compute target energy */