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-rw-r--r--src/emu/disound.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/src/emu/disound.h b/src/emu/disound.h
index e9207bbcf91..ee1f12b8f04 100644
--- a/src/emu/disound.h
+++ b/src/emu/disound.h
@@ -97,8 +97,8 @@ public:
// helpers
int inputs() const;
int outputs() const;
- sound_stream *input_to_stream_input(int inputnum, int &stream_inputnum);
- sound_stream *output_to_stream_output(int outputnum, int &stream_outputnum);
+ sound_stream *input_to_stream_input(int inputnum, int &stream_inputnum) const;
+ sound_stream *output_to_stream_output(int outputnum, int &stream_outputnum) const;
void set_input_gain(int inputnum, float gain);
void set_output_gain(int outputnum, float gain);
int inputnum_from_device(device_t &device, int outputnum = 0) const;