prevent crash when dba params are invalid

Originally committed as revision 13653 to svn://svn.ffmpeg.org/ffmpeg/trunk

prevent crash when dba params are invalid
Originally committed as revision 13653 to svn://svn.ffmpeg.org/ffmpeg/trunk
31bc6b45 · Justin Ruggles · d326dd97 · 31bc6b45
Commit 31bc6b45 authored Jun 03, 2008 by Justin Ruggles
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ac3.c libavcodec/ac3.c +2 -2

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--- a/libavcodec/ac3.c
+++ b/libavcodec/ac3.c
@@ -157,8 +157,8 @@ void ff_ac3_bit_alloc_calc_mask(AC3BitAllocParameters *s, int16_t *band_psd,
    if (dba_mode == DBA_REUSE || dba_mode == DBA_NEW) {
        int band, seg, delta;
        band = 0;
-        for (seg = 0; seg < dba_nsegs; seg++) {
-            band += dba_offsets[seg];
+        for (seg = 0; seg < FFMIN(8, dba_nsegs); seg++) {
+            band = FFMIN(49, band + dba_offsets[seg]);
            if (dba_values[seg] >= 4) {
                delta = (dba_values[seg] - 3) << 7;
            } else {