From 5f0d367fef25b30742ba71f12e339137e02c59ab Mon Sep 17 00:00:00 2001
From: Juan Linietsky <reduzio@gmail.com>
Date: Wed, 6 Sep 2017 23:13:57 -0300
Subject: Mono vorbis support fixed, closes #10787

---
 modules/stb_vorbis/audio_stream_ogg_vorbis.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/modules/stb_vorbis/audio_stream_ogg_vorbis.cpp b/modules/stb_vorbis/audio_stream_ogg_vorbis.cpp
index df427907f8..9457fbfaf6 100644
--- a/modules/stb_vorbis/audio_stream_ogg_vorbis.cpp
+++ b/modules/stb_vorbis/audio_stream_ogg_vorbis.cpp
@@ -45,6 +45,12 @@ void AudioStreamPlaybackOGGVorbis::_mix_internal(AudioFrame *p_buffer, int p_fra
 	while (todo && active) {
 
 		int mixed = stb_vorbis_get_samples_float_interleaved(ogg_stream, 2, (float *)p_buffer, todo * 2);
+		if (vorbis_stream->channels == 1 && mixed > 0) {
+			//mix mono to stereo
+			for (int i = 0; i < mixed; i++) {
+				p_buffer[i].r = p_buffer[i].l;
+			}
+		}
 		todo -= mixed;
 		frames_mixed += mixed;
 
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