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lpc: Reduce stack usage by allocating LLSModel in context. 

Signed-off-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>
This commit is contained in:
Reimar Döffinger 2014-11-22 20:49:13 +01:00
parent f87a34486a
commit 458aadf862
2 changed files with 5 additions and 1 deletions
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2
libavcodec/lpc.c
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@ -208,7 +208,7 @@ int ff_lpc_calc_coefs(LPCContext *s,
}
if (lpc_type == FF_LPC_TYPE_CHOLESKY) {
LLSModel m[2];
LLSModel *m = s->lls_models;
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));

4
libavcodec/lpc.h
View File

@ -24,6 +24,7 @@
#include <stdint.h>
#include "libavutil/avassert.h"
#include "libavutil/lls.h"
#define ORDER_METHOD_EST 0
#define ORDER_METHOD_2LEVEL 1
@ -79,6 +80,9 @@ typedef struct LPCContext {
*/
void (*lpc_compute_autocorr)(const double *data, int len, int lag,
double *autoc);
// TODO: these should be allocated to reduce ABI compatibility issues
LLSModel lls_models[2];
} LPCContext;