diff --git a/include/avm/drc.h b/include/avm/drc.h
index 89a27e8ac..954d5d165 100644
--- a/include/avm/drc.h
+++ b/include/avm/drc.h
@@ -26,6 +26,30 @@ typedef enum AVMDrcMode
    AVM_DRC_MODE_DOUBLE = 2,
 } AVMDrcMode;
 
+typedef enum AVMDrcSystemAudioMode
+{
+    AVM_DRC_SYSTEM_AUDIO_MODE_UNKNOWN_0 = 0, // mono?
+    AVM_DRC_SYSTEM_AUDIO_MODE_UNKNOWN_1 = 1, // stereo?
+    AVM_DRC_SYSTEM_AUDIO_MODE_SURROUND  = 2,
+} AVMDrcSystemAudioMode;
+
+/**
+ * Uses AVMGetDRCSystemAudioMode internally
+ * @param outAudioMode
+ * @return 0 on success, -2 on error
+ */
+int
+AVMGetSystemDRCAudioMode(AVMDrcSystemAudioMode *outAudioMode);
+
+BOOL
+AVMGetDRCSystemAudioMode(AVMDrcSystemAudioMode *outAudioMode);
+
+uint32_t
+AVMGetDRCVertCount();
+
+BOOL
+AVMIsDRCFirstFlippDone();
+
 BOOL
 AVMGetDRCScanMode(AVMDrcScanMode *outScanMode);
 
@@ -35,6 +59,12 @@ AVMGetDRCMode(AVMDrcMode *outMode);
 uint32_t
 AVMProbeDRCNum(void);
 
+BOOL
+AVMSetDRCEnable(BOOL enable);
+
+BOOL
+AVMSetDRCGamma(float *gamma);
+
 #ifdef __cplusplus
 }
 #endif