From e7997087074cad8fb77ab30b1324761147d45985 Mon Sep 17 00:00:00 2001
From: Eric Rosenbaum <eric.rosenbaum@gmail.com>
Date: Mon, 16 Dec 2019 17:05:29 -0500
Subject: [PATCH] Use for loop instead of filter (20x faster)
---
src/containers/sound-editor.jsx | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/src/containers/sound-editor.jsx b/src/containers/sound-editor.jsx
index c68c30d05..5c5a57b54 100644
--- a/src/containers/sound-editor.jsx
+++ b/src/containers/sound-editor.jsx
@@ -362,9 +362,11 @@ class SoundEditor extends React.Component {
}
backupDownSampler (buffer, newRate) {
log.warn(`Using backup down sampler for conversion from ${buffer.sampleRate} to ${newRate}`);
- const newSamples = buffer.samples.filter((element, index) =>
- index % 2 === 0
- );
+ const newLength = Math.floor(buffer.samples.length / 2);
+ const newSamples = new Float32Array(newLength);
+ for (let i = 0; i < newLength; i++) {
+ newSamples[i] = buffer.samples[i * 2];
+ }
return {
samples: newSamples,
sampleRate: newRate
--
GitLab