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-rw-r--r--libavcodec/lpc.c29
1 files changed, 16 insertions, 13 deletions
diff --git a/libavcodec/lpc.c b/libavcodec/lpc.c
index 144bbede44..995e4e2ad4 100644
--- a/libavcodec/lpc.c
+++ b/libavcodec/lpc.c
@@ -176,7 +176,7 @@ int ff_lpc_calc_coefs(LPCContext *s,
double autoc[MAX_LPC_ORDER+1];
double ref[MAX_LPC_ORDER];
double lpc[MAX_LPC_ORDER][MAX_LPC_ORDER];
- int i, j, pass;
+ int i, j, pass = 0;
int opt_order;
assert(max_order >= MIN_LPC_ORDER && max_order <= MAX_LPC_ORDER &&
@@ -189,7 +189,7 @@ int ff_lpc_calc_coefs(LPCContext *s,
ff_lpc_init(s, blocksize, max_order, lpc_type);
}
- if (lpc_type == FF_LPC_TYPE_LEVINSON) {
+ if (lpc_type == FF_LPC_TYPE_LEVINSON || (lpc_type == FF_LPC_TYPE_CHOLESKY && lpc_passes > 1)) {
s->lpc_apply_welch_window(samples, blocksize, s->windowed_samples);
s->lpc_compute_autocorr(s->windowed_samples, blocksize, max_order, autoc);
@@ -198,13 +198,20 @@ int ff_lpc_calc_coefs(LPCContext *s,
for(i=0; i<max_order; i++)
ref[i] = fabs(lpc[i][i]);
- } else if (lpc_type == FF_LPC_TYPE_CHOLESKY) {
+
+ pass++;
+ }
+
+ if (lpc_type == FF_LPC_TYPE_CHOLESKY) {
LLSModel m[2];
LOCAL_ALIGNED(32, double, var, [FFALIGN(MAX_LPC_ORDER+1,4)]);
double av_uninit(weight);
memset(var, 0, FFALIGN(MAX_LPC_ORDER+1,4)*sizeof(*var));
- for(pass=0; pass<lpc_passes; pass++){
+ for(j=0; j<max_order; j++)
+ m[0].coeff[max_order-1][j] = -lpc[max_order-1][j];
+
+ for(; pass<lpc_passes; pass++){
avpriv_init_lls(&m[pass&1], max_order);
weight=0;
@@ -259,15 +266,11 @@ av_cold int ff_lpc_init(LPCContext *s, int blocksize, int max_order,
s->max_order = max_order;
s->lpc_type = lpc_type;
- if (lpc_type == FF_LPC_TYPE_LEVINSON) {
- s->windowed_buffer = av_mallocz((blocksize + 2 + FFALIGN(max_order, 4)) *
- sizeof(*s->windowed_samples));
- if (!s->windowed_buffer)
- return AVERROR(ENOMEM);
- s->windowed_samples = s->windowed_buffer + FFALIGN(max_order, 4);
- } else {
- s->windowed_samples = NULL;
- }
+ s->windowed_buffer = av_mallocz((blocksize + 2 + FFALIGN(max_order, 4)) *
+ sizeof(*s->windowed_samples));
+ if (!s->windowed_buffer)
+ return AVERROR(ENOMEM);
+ s->windowed_samples = s->windowed_buffer + FFALIGN(max_order, 4);
s->lpc_apply_welch_window = lpc_apply_welch_window_c;
s->lpc_compute_autocorr = lpc_compute_autocorr_c;