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Fix possibly harmful outbound addressing. Patch by Kenan Gillet.

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Originally committed as revision 18528 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Kenan Gillet 2009-04-15 19:28:28 +00:00 committed by Reynaldo H. Verdejo Pinochet
parent c21c835b8d
commit 807c4c7875
1 changed files with 4 additions and 6 deletions
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10
libavcodec/celp_filters.c
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@ -61,15 +61,14 @@ int ff_celp_lp_synthesis_filter(
{
int i,n;
// These two lines are to avoid a -1 subtraction in the main loop
// This line is to avoid a +1 subtraction in the main loop.
filter_length++;
filter_coeffs--;
for(n=0; n<buffer_length; n++)
{
int sum = rounder;
for(i=1; i<filter_length; i++)
sum -= filter_coeffs[i] * out[n-i];
sum -= filter_coeffs[i-1] * out[n-i];
sum = (sum >> 12) + in[n];
@ -94,14 +93,13 @@ void ff_celp_lp_synthesis_filterf(
{
int i,n;
// These two lines are to avoid a -1 subtraction in the main loop
// This line is to avoid a +1 subtraction in the main loop
filter_length++;
filter_coeffs--;
for(n=0; n<buffer_length; n++)
{
out[n] = in[n];
for(i=1; i<filter_length; i++)
out[n] -= filter_coeffs[i] * out[n-i];
out[n] -= filter_coeffs[i-1] * out[n-i];
}
}