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avcodec/alsdec: do not set nbits invalidly

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note that the spec actually disallows the 0 case too but we are
a little lenient here so the full 24bit twos-complement range can be handled

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 7ae36ceba9)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer
2026-03-25 01:25:40 +01:00
parent 939d84afb0
commit 2e6b53db41
1 changed files with 4 additions and 1 deletions
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libavcodec/alsdec.c
+4 -1
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@@ -1545,7 +1545,10 @@ static int read_diff_float_data(ALSDecContext *ctx, unsigned int ra_frame) {
if (ctx->raw_samples[c][i] != 0) {
//The following logic is taken from Tabel 14.45 and 14.46 from the ISO spec
if (av_cmp_sf_ieee754(acf[c], FLOAT_1)) {
nbits[i] = 23 - av_log2(FFABSU(ctx->raw_samples[c][i]));
int nbit = av_log2(FFABSU(ctx->raw_samples[c][i]));
if (nbit > 23)
return AVERROR_INVALIDDATA;
nbits[i] = 23 - nbit;
} else {
nbits[i] = 23;
}