From 59b703c4f80253a64a2a13d76fb75ecd45fc3e86 Mon Sep 17 00:00:00 2001
From: Saracen <SaracenOne@gmail.com>
Date: Tue, 31 Jul 2018 04:46:29 +0100
Subject: [PATCH] Add extra latency to microphone playback to reduce clipping.

---
 servers/audio/audio_stream.cpp | 2 +-
 servers/audio/audio_stream.h   | 2 ++
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/servers/audio/audio_stream.cpp b/servers/audio/audio_stream.cpp
index 618ebd526d5b..eef8aba0c436 100644
--- a/servers/audio/audio_stream.cpp
+++ b/servers/audio/audio_stream.cpp
@@ -138,7 +138,7 @@ void AudioStreamPlaybackMicrophone::_mix_internal(AudioFrame *p_buffer, int p_fr
 	unsigned int input_size = AudioDriver::get_singleton()->get_input_size();
 
 	// p_frames is multipled by two since an AudioFrame is stereo
-	if ((p_frames * 2) > input_size) {
+	if ((p_frames + MICROPHONE_PLAYBACK_DELAY * 2) > input_size) {
 		for (int i = 0; i < p_frames; i++) {
 			p_buffer[i] = AudioFrame(0.0f, 0.0f);
 		}
diff --git a/servers/audio/audio_stream.h b/servers/audio/audio_stream.h
index f0f756129e27..66e1b6ee2fd8 100644
--- a/servers/audio/audio_stream.h
+++ b/servers/audio/audio_stream.h
@@ -122,6 +122,8 @@ class AudioStreamPlaybackMicrophone : public AudioStreamPlaybackResampled {
 	GDCLASS(AudioStreamPlaybackMicrophone, AudioStreamPlayback)
 	friend class AudioStreamMicrophone;
 
+	const int MICROPHONE_PLAYBACK_DELAY = 256;
+
 	bool active;
 	unsigned int input_ofs;