From 4cfa640e6985849ff107591b9da144995205fcc9 Mon Sep 17 00:00:00 2001
From: "Ryan C. Gordon" <icculus@icculus.org>
Date: Wed, 24 May 2017 16:41:47 -0400
Subject: [PATCH] Initialize the SDL audio subsystem if necessary.

SDL_OpenAudio() did this for us (legacy 1.2 behavior), but
SDL_OpenAudioDevice() doesn't, leaving us to manage it.

Fixes Bugzilla #3596.
---
 mixer.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/mixer.c b/mixer.c
index 104b0b28..9d255690 100644
--- a/mixer.c
+++ b/mixer.c
@@ -25,9 +25,7 @@
 #include <stdlib.h>
 #include <string.h>
 
-#include "SDL_mutex.h"
-#include "SDL_endian.h"
-#include "SDL_timer.h"
+#include "SDL.h"
 
 #include "SDL_mixer.h"
 #include "mixer.h"
@@ -435,6 +433,15 @@ int Mix_OpenAudioDevice(int frequency, Uint16 format, int nchannels, int chunksi
     int i;
     SDL_AudioSpec desired;
 
+    /* This used to call SDL_OpenAudio(), which initializes the audio
+       subsystem if necessary. Since SDL_OpenAudioDevice() doesn't,
+       we have to handle this case here. */
+    if (!SDL_WasInit(SDL_INIT_AUDIO)) {
+        if (SDL_InitSubSystem(SDL_INIT_AUDIO) < 0) {
+            return -1;
+        }
+    }
+
     /* If the mixer is already opened, increment open count */
     if ( audio_opened ) {
         if ( format == mixer.format && nchannels == mixer.channels ) {