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Code Issues Releases Activity

avcodec/ac3dec: Print the value of out of range exponents

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Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2015-12-24 17:46:12 +01:00
parent 26937fb416
commit 052e692e85
1 changed files with 6 additions and 4 deletions
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10
libavcodec/ac3dec.c
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@ -411,7 +411,8 @@ static void set_downmix_coeffs(AC3DecodeContext *s)
* Decode the grouped exponents according to exponent strategy.
* reference: Section 7.1.3 Exponent Decoding
*/
static int decode_exponents(GetBitContext *gbc, int exp_strategy, int ngrps,
static int decode_exponents(AC3DecodeContext *s,
GetBitContext *gbc, int exp_strategy, int ngrps,
uint8_t absexp, int8_t *dexps)
{
int i, j, grp, group_size;
@ -431,8 +432,10 @@ static int decode_exponents(GetBitContext *gbc, int exp_strategy, int ngrps,
prevexp = absexp;
for (i = 0, j = 0; i < ngrps * 3; i++) {
prevexp += dexp[i] - 2;
if (prevexp > 24U)
if (prevexp > 24U) {
av_log(s->avctx, AV_LOG_ERROR, "exponent %d is out-of-range\n", prevexp);
return -1;
}
switch (group_size) {
case 4: dexps[j++] = prevexp;
dexps[j++] = prevexp;
@ -1141,10 +1144,9 @@ static int decode_audio_block(AC3DecodeContext *s, int blk)
for (ch = !cpl_in_use; ch <= s->channels; ch++) {
if (s->exp_strategy[blk][ch] != EXP_REUSE) {
s->dexps[ch][0] = get_bits(gbc, 4) << !ch;
if (decode_exponents(gbc, s->exp_strategy[blk][ch],
if (decode_exponents(s, gbc, s->exp_strategy[blk][ch],
s->num_exp_groups[ch], s->dexps[ch][0],
&s->dexps[ch][s->start_freq[ch]+!!ch])) {
av_log(s->avctx, AV_LOG_ERROR, "exponent out-of-range\n");
return AVERROR_INVALIDDATA;
}
if (ch != CPL_CH && ch != s->lfe_ch)