[tbb-commits] [tor-browser] 23/34: Bug 1762620 - Only pad audio buffers when doing up mixing. r=alwu, a=dsmith

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richard pushed a commit to branch tor-browser-91.9esr-11.0-1
in repository tor-browser.

commit 520de8913f9849ee5d333ed9f50a4be25cfb51bc
Author: Paul Adenot <paul at paul.cx>
AuthorDate: Fri Apr 22 13:19:01 2022 +0000

    Bug 1762620 - Only pad audio buffers when doing up mixing. r=alwu,a=dsmith
    
    Differential Revision: https://phabricator.services.mozilla.com/D143623
---
 dom/media/AudioConverter.cpp | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/dom/media/AudioConverter.cpp b/dom/media/AudioConverter.cpp
index d2eb7335a997f..1f5860804318e 100644
--- a/dom/media/AudioConverter.cpp
+++ b/dom/media/AudioConverter.cpp
@@ -156,8 +156,10 @@ static void dumbUpDownMix(TYPE* aOut, int32_t aOutChannels, const TYPE* aIn,
     for (int32_t j = 0; j < commonChannels; j++) {
       aOut[i * aOutChannels + j] = aIn[i * aInChannels + j];
     }
-    for (int32_t j = 0; j < aInChannels - aOutChannels; j++) {
-      aOut[i * aOutChannels + j] = 0;
+    if (aOutChannels > aInChannels) {
+      for (int32_t j = 0; j < aInChannels - aOutChannels; j++) {
+        aOut[i * aOutChannels + j] = 0;
+      }
     }
   }
 }

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