Author: superdump
Date: Mon Jul 28 10:57:37 2008
New Revision: 2875
Log:
Avoid conducting two loops in the unsigned codebook case
Modified:
aac/aac.c
Modified: aac/aac.c
==============================================================================
--- aac/aac.c (original)
+++ aac/aac.c Mon Jul 28 10:57:37 2008
@@ -1272,12 +1272,13 @@ static int decode_spectrum(AACContext *
const int coef_idx = (group << 7) + k;
const int8_t *vq_ptr = &codebook_vectors[cur_band_type
- 1][index * dim];
int j;
- for (j = 0; j < dim; j++)
- icoef[coef_idx + j] = 1;
if (is_cb_unsigned) {
for (j = 0; j < dim; j++)
- if (vq_ptr[j] && get_bits1(gb))
- icoef[coef_idx + j] = -1;
+ if (vq_ptr[j])
+ icoef[coef_idx + j] = 1 - 2*get_bits1(gb);
+ }else {
+ for (j = 0; j < dim; j++)
+ icoef[coef_idx + j] = 1;
}
if (cur_band_type == ESC_BT) {
for (j = 0; j < 2; j++) {
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