From 77bef42aceeb1a2e0c3ef66c4fb8fcf217d093e3 Mon Sep 17 00:00:00 2001
From: Tulir Asokan <tulir@maunium.net>
Date: Mon, 21 Feb 2022 14:34:20 +0200
Subject: [PATCH] Use dynamic multiplier when bridging waveform

---
 portal.go | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/portal.go b/portal.go
index a1ba454..4da13aa 100644
--- a/portal.go
+++ b/portal.go
@@ -1983,9 +1983,19 @@ func (portal *Portal) convertMediaMessageContent(intent *appservice.IntentAPI, m
 		var waveform []int
 		if audioMessage.Waveform != nil {
 			waveform = make([]int, len(audioMessage.Waveform))
+			max := 0
 			for i, part := range audioMessage.Waveform {
-				// TODO is 4 the right multiplier?
-				waveform[i] = int(part) * 4
+				waveform[i] = int(part)
+				if waveform[i] > max {
+					max = waveform[i]
+				}
+			}
+			multiplier := 1024 / max
+			if multiplier > 32 {
+				multiplier = 32
+			}
+			for i := range waveform {
+				waveform[i] *= multiplier
 			}
 		}
 		extraContent["org.matrix.msc1767.audio"] = map[string]interface{}{