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celp_math: cleanup ff_dot_product()

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based on code & idea by vitor

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2011-09-29 21:21:26 +02:00
parent 84f8aef40c
commit 11512367d3
3 changed files with 16 additions and 17 deletions
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12
libavcodec/celp_math.c
View File

@ -197,14 +197,14 @@ int ff_log2(uint32_t value)
return (power_int << 15) + value;
}
int ff_dot_product(const int16_t *a, const int16_t *b, int length, int shift)
int ff_dot_product(const int16_t *a, const int16_t *b, int length)
{
int i, sum = 0;
int i;
int64_t sum = 0;
for (i = 0; i < length; i++)
sum += MUL16(a[i], b[i]);
for (i = 0; i < length; i++) {
int64_t prod = av_clipl_int32(MUL64(a[i], b[i]) << shift);
sum = av_clipl_int32(sum + prod);
}
return sum;
}

3
libavcodec/celp_math.h
View File

@ -68,11 +68,10 @@ static inline int bidir_sal(int value, int offset)
* @param a input data array
* @param b input data array
* @param length number of elements
* @param shift the result is scaled by 2^shift
*
* @return dot product = sum of elementwise products
*/
int ff_dot_product(const int16_t *a, const int16_t *b, int length, int shift);
int ff_dot_product(const int16_t *a, const int16_t *b, int length);
/**
* returns the dot product.

18
libavcodec/g723_1.c
View File

@ -553,7 +553,7 @@ static void gen_acb_excitation(int16_t *vector, int16_t *prev_excitation,
/* Calculate adaptive vector */
cb_ptr += subfrm.ad_cb_gain * 20;
for (i = 0; i < SUBFRAME_LEN; i++) {
sum = ff_dot_product(residual + i, cb_ptr, PITCH_ORDER, 1);
sum = ff_dot_product(residual + i, cb_ptr, PITCH_ORDER)<<1;
vector[i] = av_clipl_int32((sum << 1) + (1 << 15)) >> 16;
}
}
@ -579,7 +579,7 @@ static int autocorr_max(G723_1_Context *p, int offset, int *ccr_max,
limit = FFMIN(FRAME_LEN + PITCH_MAX - offset - length, pitch_lag + 3);
for (i = pitch_lag - 3; i <= limit; i++) {
ccr = ff_dot_product(buf, buf + dir * i, length, 1);
ccr = ff_dot_product(buf, buf + dir * i, length)<<1;
if (ccr > *ccr_max) {
*ccr_max = ccr;
@ -678,17 +678,17 @@ static void comp_ppf_coeff(G723_1_Context *p, int offset, int pitch_lag,
return;
/* Compute target energy */
energy[0] = ff_dot_product(buf, buf, SUBFRAME_LEN, 1);
energy[0] = ff_dot_product(buf, buf, SUBFRAME_LEN)<<1;
/* Compute forward residual energy */
if (fwd_lag)
energy[2] = ff_dot_product(buf + fwd_lag, buf + fwd_lag,
SUBFRAME_LEN, 1);
SUBFRAME_LEN)<<1;
/* Compute backward residual energy */
if (back_lag)
energy[4] = ff_dot_product(buf - back_lag, buf - back_lag,
SUBFRAME_LEN, 1);
SUBFRAME_LEN)<<1;
/* Normalize and shorten */
temp1 = 0;
@ -749,7 +749,7 @@ static int comp_interp_index(G723_1_Context *p, int pitch_lag,
ccr = av_clipl_int32((int64_t)ccr + (1 << 15)) >> 16;
/* Compute target energy */
tgt_eng = ff_dot_product(buf, buf, SUBFRAME_LEN * 2, 1);
tgt_eng = ff_dot_product(buf, buf, SUBFRAME_LEN * 2)<<1;
*exc_eng = av_clipl_int32(tgt_eng + (1 << 15)) >> 16;
if (ccr <= 0)
@ -757,7 +757,7 @@ static int comp_interp_index(G723_1_Context *p, int pitch_lag,
/* Compute best energy */
best_eng = ff_dot_product(buf - index, buf - index,
SUBFRAME_LEN * 2, 1);
SUBFRAME_LEN * 2)<<1;
best_eng = av_clipl_int32((int64_t)best_eng + (1 << 15)) >> 16;
temp = best_eng * *exc_eng >> 3;
@ -911,9 +911,9 @@ static void formant_postfilter(G723_1_Context *p, int16_t *lpc, int16_t *buf)
/* Compute auto correlation coefficients */
auto_corr[0] = ff_dot_product(temp_vector, temp_vector + 1,
SUBFRAME_LEN - 1, 1);
SUBFRAME_LEN - 1)<<1;
auto_corr[1] = ff_dot_product(temp_vector, temp_vector,
SUBFRAME_LEN, 1);
SUBFRAME_LEN)<<1;
/* Compute reflection coefficient */
temp = auto_corr[1] >> 16;