pipewire: Fix silence dropping

It used to drop silence per channel, not silence per sample. In the
unlikely case of perfect silence on one channel and sound on the other
this would switch effectively the channels.

1 files changed, 11 insertions, 3 deletions

diff --git a/soundbox/pipewire.go b/soundbox/pipewire.go
index 476d2e4..bb672f8 100644
--- a/soundbox/pipewire.go
+++ b/soundbox/pipewire.go
@@ -54,12 +54,20 @@ func (pwc pwCapture) Read(p []byte) (int, error) {
 func s16leDropSilence(input []byte) []byte {
 	output := make([]byte, 0)
 
-	for i := 0; i < (len(input) - 1); i += 2 {
-		if input[i] == byte(0) && input[i+1] == byte(0) {
+	cut := len(input) % 4
+	length := len(input) - cut // s16 raw audio is 4 bytes per sample
+
+	for i := 0; i < length; i += 4 {
+		if input[i+0] == byte(0) &&
+			input[i+1] == byte(0) &&
+			input[i+2] == byte(0) &&
+			input[i+3] == byte(0) {
 			continue
 		}
-		output = append(output, input[i])
+		output = append(output, input[i+0])
 		output = append(output, input[i+1])
+		output = append(output, input[i+2])
+		output = append(output, input[i+3])
 	}
 
 	return output