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avcodec/amrwbdec: Fix division by 0 in find_hb_gain()

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This restructures the code slightly toward D_UTIL_dec_synthesis()

Fixes: 7420/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_AMRWB_fuzzer-6577305112543232

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2018-06-03 00:48:06 +02:00
parent 146cdf7e4b
commit dce80a4b47
1 changed files with 8 additions and 3 deletions
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11
libavcodec/amrwbdec.c
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@ -862,15 +862,20 @@ static float find_hb_gain(AMRWBContext *ctx, const float *synth,
{
int wsp = (vad > 0);
float tilt;
float tmp;
if (ctx->fr_cur_mode == MODE_23k85)
return qua_hb_gain[hb_idx] * (1.0f / (1 << 14));
tilt = ctx->celpm_ctx.dot_productf(synth, synth + 1, AMRWB_SFR_SIZE - 1) /
ctx->celpm_ctx.dot_productf(synth, synth, AMRWB_SFR_SIZE);
tmp = ctx->celpm_ctx.dot_productf(synth, synth + 1, AMRWB_SFR_SIZE - 1);
if (tmp > 0) {
tilt = tmp / ctx->celpm_ctx.dot_productf(synth, synth, AMRWB_SFR_SIZE);
} else
tilt = 0;
/* return gain bounded by [0.1, 1.0] */
return av_clipf((1.0 - FFMAX(0.0, tilt)) * (1.25 - 0.25 * wsp), 0.1, 1.0);
return av_clipf((1.0 - tilt) * (1.25 - 0.25 * wsp), 0.1, 1.0);
}
/**