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libswresample: Avoid needlessly large on-stack array. 

We only actually need to use a tiny part of it.
Unfortunately we seem to have no real test coverage on
the code, so this is a bit risky.

Signed-off-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>
This commit is contained in:
Reimar Döffinger 2014-09-02 23:50:55 +02:00
parent ab84effded
commit 2231d5b671
1 changed files with 9 additions and 5 deletions
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14
libswresample/rematrix.c
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@ -56,6 +56,7 @@
#define TOP_BACK_LEFT 15
#define TOP_BACK_CENTER 16
#define TOP_BACK_RIGHT 17
#define NUM_NAMED_CHANNELS 18
int swr_set_matrix(struct SwrContext *s, const double *matrix, int stride)
{
@ -112,7 +113,7 @@ static int sane_layout(int64_t layout){
av_cold static int auto_matrix(SwrContext *s)
{
int i, j, out_i;
double matrix[64][64]={{0}};
double matrix[NUM_NAMED_CHANNELS][NUM_NAMED_CHANNELS]={{0}};
int64_t unaccounted, in_ch_layout, out_ch_layout;
double maxcoef=0;
char buf[128];
@ -145,7 +146,7 @@ av_cold static int auto_matrix(SwrContext *s)
}
memset(s->matrix, 0, sizeof(s->matrix));
for(i=0; i<64; i++){
for(i=0; i<FF_ARRAY_ELEMS(matrix); i++){
if(in_ch_layout & out_ch_layout & (1ULL<<i))
matrix[i][i]= 1.0;
}
@ -299,9 +300,12 @@ av_cold static int auto_matrix(SwrContext *s)
double sum=0;
int in_i=0;
for(j=0; j<64; j++){
s->matrix[out_i][in_i]= matrix[i][j];
if(matrix[i][j]){
sum += fabs(matrix[i][j]);
if (i < FF_ARRAY_ELEMS(matrix) && j < FF_ARRAY_ELEMS(matrix[0]))
s->matrix[out_i][in_i]= matrix[i][j];
else
s->matrix[out_i][in_i]= i == j && (in_ch_layout & out_ch_layout & (1ULL<<i));
if(s->matrix[out_i][in_i]){
sum += fabs(s->matrix[out_i][in_i]);
}
if(in_ch_layout & (1ULL<<j))
in_i++;