sdlaudio: enable (in|out).mixing-engine=off

Enable the SDL2 backend options -audiodev sdl,out.mixing-
engine=off,in.mixing-engine=off.

Signed-off-by: Volker Rümelin <vr_qemu@t-online.de>
Message-id: 9315afe5-5958-c0b4-ea1e-14769511a9d5@t-online.de
Message-Id: <20210110100239.27588-11-vr_qemu@t-online.de>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

audio/sdlaudio.c

@@ -495,8 +495,8 @@ static struct audio_driver sdl_audio_driver = {
     .fini           = sdl_audio_fini,
     .pcm_ops        = &sdl_pcm_ops,
     .can_be_default = 1,
-    .max_voices_out = 1,
-    .max_voices_in  = 1,
+    .max_voices_out = INT_MAX,
+    .max_voices_in  = INT_MAX,
     .voice_size_out = sizeof(SDLVoiceOut),
     .voice_size_in  = sizeof(SDLVoiceIn),
 };