From 683e212a779341a7b376fbb6d5df54cb8205893d Mon Sep 17 00:00:00 2001
From: Stefano Pigozzi <stefano.pigozzi@gmail.com>
Date: Thu, 3 Oct 2013 23:38:19 +0200
Subject: [PATCH] ao_coreaudio: clear output buffer on buffer underrun

Output silence to the output buffer during underruns. This removes small
occasional glitches that happen before the AUHAL is actually paused from the
`audio_pause` call.

Fixes #269
---
 audio/out/ao_coreaudio.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/audio/out/ao_coreaudio.c b/audio/out/ao_coreaudio.c
index cba0900973..878d92b0af 100644
--- a/audio/out/ao_coreaudio.c
+++ b/audio/out/ao_coreaudio.c
@@ -112,6 +112,7 @@ static OSStatus render_cb_lpcm(void *ctx, AudioUnitRenderActionFlags *aflags,
     if (mp_ring_buffered(p->buffer) < requested) {
         MP_VERBOSE(ao, "buffer underrun\n");
         audio_pause(ao);
+        memset(buf.mData, 0, requested);
     } else {
         mp_ring_read(p->buffer, buf.mData, requested);
     }