Update backend API: read-only MIDI input buffers

2 files changed, 2 insertions, 2 deletions

diff --git a/libs/backends/jack/jack_audiobackend.h b/libs/backends/jack/jack_audiobackend.h
index 847b21b767..2c67dc72fd 100644
--- a/libs/backends/jack/jack_audiobackend.h
+++ b/libs/backends/jack/jack_audiobackend.h
@@ -175,7 +175,7 @@ class JACKAudioBackend : public AudioBackend {
 	return true;
     }
 
-    int      midi_event_get (pframes_t& timestamp, size_t& size, uint8_t** buf, void* port_buffer, uint32_t event_index);
+    int      midi_event_get (pframes_t& timestamp, size_t& size, uint8_t const** buf, void* port_buffer, uint32_t event_index);
     int      midi_event_put (void* port_buffer, pframes_t timestamp, const uint8_t* buffer, size_t size);
     uint32_t get_midi_event_count (void* port_buffer);
     void     midi_clear (void* port_buffer);
diff --git a/libs/backends/jack/jack_portengine.cc b/libs/backends/jack/jack_portengine.cc
index a73f4608aa..dfa2bdad11 100644
--- a/libs/backends/jack/jack_portengine.cc
+++ b/libs/backends/jack/jack_portengine.cc
@@ -488,7 +488,7 @@ JACKAudioBackend::disconnect_all (PortHandle port)
 }
 
 int
-JACKAudioBackend::midi_event_get (pframes_t& timestamp, size_t& size, uint8_t** buf, void* port_buffer, uint32_t event_index)
+JACKAudioBackend::midi_event_get (pframes_t& timestamp, size_t& size, uint8_t const** buf, void* port_buffer, uint32_t event_index)
 {
 	jack_midi_event_t ev;
 	int ret;