From b0854bc42c87ab8d88af4485b1fcdc7f286cdbb3 Mon Sep 17 00:00:00 2001
From: Kevin Mitchell <kevmitch@gmail.com>
Date: Fri, 28 Nov 2014 07:50:34 -0800
Subject: [PATCH] ao/wasapi: more consistent/reliable method of computing extra
 WAVEFORMATEXTENSIBLE size

---
 audio/out/ao_wasapi_utils.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/audio/out/ao_wasapi_utils.c b/audio/out/ao_wasapi_utils.c
index d491f017ea..8a57c8660b 100755
--- a/audio/out/ao_wasapi_utils.c
+++ b/audio/out/ao_wasapi_utils.c
@@ -172,8 +172,7 @@ static void set_format(WAVEFORMATEXTENSIBLE *wformat, WORD bytepersample,
     wformat->Format.nAvgBytesPerSec = samplerate * block_align;
     wformat->Format.nBlockAlign = block_align;
     wformat->Format.wBitsPerSample = bytepersample * 8;
-    wformat->Format.cbSize =
-        22; /* must be at least 22 for WAVE_FORMAT_EXTENSIBLE */
+    wformat->Format.cbSize = sizeof(WAVEFORMATEXTENSIBLE) - sizeof(WAVEFORMATEX);
     if (bytepersample == 4)
         wformat->SubFormat = mp_KSDATAFORMAT_SUBTYPE_IEEE_FLOAT;
     else