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-rw-r--r--libao2/audio_plugin.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/libao2/audio_plugin.h b/libao2/audio_plugin.h
index 084be9cc50..cc3e5dfbfc 100644
--- a/libao2/audio_plugin.h
+++ b/libao2/audio_plugin.h
@@ -83,6 +83,8 @@ extern ao_plugin_functions_t audio_plugin_eq;
// Control parameters used by the plugins
#define AOCONTROL_PLUGIN_SET_LEN 1 // All plugins must respond to this parameter
+#define AOCONTROL_PLUGIN_ES_SET 4 // set extra stereo coefficient
+#define AOCONTROL_PLUGIN_ES_GET 5 // get extra stereo coefficient
#endif