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Ignore overflowing left shift

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It's audio data, not an index or anything like that, so the most an
overflow can do is make it sound worse.

Bug: chromium:834531
Change-Id: Icb39c1bb011219c1a6fe67bc582390daa2693379
Reviewed-on: https://webrtc-review.googlesource.com/71160
Reviewed-by: Henrik Lundin <henrik.lundin@webrtc.org>
Commit-Queue: Karl Wiberg <kwiberg@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#22947}
This commit is contained in:
Karl Wiberg
2018-04-19 14:07:25 +02:00
committed by Commit Bot
parent e63d38ba34
commit 36b096c38e
1 changed files with 1 additions and 2 deletions
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3
modules/audio_coding/codecs/isac/fix/source/lattice.c
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@ -279,8 +279,7 @@ void WebRtcIsacfix_NormLatticeFilterAr(size_t orderCoef,
for (i=0;i<HALF_SUBFRAMELEN;i++)
{
tmp32 = lat_inQ25[i + temp1] * (1 << 1); // Q25->Q26
tmp32 = OverflowingLShiftS32(lat_inQ25[i + temp1], 1); // Q25->Q26
tmp32 = WEBRTC_SPL_MUL_16_32_RSFT16(inv_gain16, tmp32); //lat_in[]*inv_gain in (Q(18-sh)*Q26)>>16 = Q(28-sh)
tmp32 = WEBRTC_SPL_SHIFT_W32(tmp32, -(28-sh)); // lat_in[]*inv_gain in Q0