From 4fcace9aed211519f83f45fe209c88e37a902a03 Mon Sep 17 00:00:00 2001
From: Bernhard Schelling <14200249+schellingb@users.noreply.github.com>
Date: Wed, 13 Jan 2021 02:07:21 +0900
Subject: [PATCH] Recover from messages not handled by the device

When an underlying MIDI device does not understand/support a MIDI message (very common with sysex messages) it returns an error code.
With this fix MIDI output can continue gracefully even after an emulated game sends an unsupported message.
---
 midi/drivers/winmm_midi.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/midi/drivers/winmm_midi.c b/midi/drivers/winmm_midi.c
index 2cec9187c0..f7d3d76475 100644
--- a/midi/drivers/winmm_midi.c
+++ b/midi/drivers/winmm_midi.c
@@ -605,6 +605,10 @@ static bool winmm_midi_flush(void *p)
 #ifdef DEBUG
          RARCH_ERR("[MIDI]: midiStreamOut failed with error %d.\n", mmr);
 #endif
+         // Core sent MIDI message not understood by the MIDI driver
+         // Make this buffer available to be used again
+         buf->header.dwFlags |= MHDR_DONE;
+         buf->header.dwFlags &= ~MHDR_INQUEUE;
          return false;
       }