From cc6714bb16b1f0716ba43701d47273dbe9657b8b Mon Sep 17 00:00:00 2001 From: Loren Merritt Date: Tue, 18 Jun 2013 21:30:40 +0000 Subject: lpc: remove "decay" argument We never used the rolling-average mode, and this makes av_update_lls 15% faster. Signed-off-by: Luca Barbato --- libavutil/lls.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) (limited to 'libavutil/lls.c') diff --git a/libavutil/lls.c b/libavutil/lls.c index 246189bdf7..2061e6a5a9 100644 --- a/libavutil/lls.c +++ b/libavutil/lls.c @@ -38,13 +38,12 @@ av_cold void avpriv_init_lls(LLSModel *m, int indep_count) m->indep_count = indep_count; } -void avpriv_update_lls(LLSModel *m, double *var, double decay) +void avpriv_update_lls(LLSModel *m, double *var) { int i, j; for (i = 0; i <= m->indep_count; i++) { for (j = i; j <= m->indep_count; j++) { - m->covariance[i][j] *= decay; m->covariance[i][j] += var[i] * var[j]; } } @@ -125,7 +124,7 @@ av_cold void av_init_lls(LLSModel *m, int indep_count) } void av_update_lls(LLSModel *m, double *param, double decay) { - avpriv_update_lls(m, param, decay); + avpriv_update_lls(m, param); } void av_solve_lls(LLSModel *m, double threshold, int min_order) { @@ -160,7 +159,7 @@ int main(void) var[1] = var[0] + av_lfg_get(&lfg) / (double) UINT_MAX - 0.5; var[2] = var[1] + av_lfg_get(&lfg) / (double) UINT_MAX - 0.5; var[3] = var[2] + av_lfg_get(&lfg) / (double) UINT_MAX - 0.5; - avpriv_update_lls(&m, var, 0.99); + avpriv_update_lls(&m, var); avpriv_solve_lls(&m, 0.001, 0); for (order = 0; order < 3; order++) { eval = avpriv_evaluate_lls(&m, var + 1, order); -- cgit v1.2.3