diff --git a/hal/Android.mk b/hal/Android.mk
index 8615268..41867c9 100755
--- a/hal/Android.mk
+++ b/hal/Android.mk
@@ -138,6 +138,10 @@
 
 LOCAL_HEADER_LIBRARIES := libhardware_headers
 
+ifeq ($(ENABLE_AUDIO_LEGACY_TECHPACK),true)
+LOCAL_HEADER_LIBRARIES += qti_legacy_audio_kernel_uapi
+endif
+
 LOCAL_SRC_FILES := \
     audio_hw.c \
     acdb.c \
diff --git a/hal/audio_extn/Android.mk b/hal/audio_extn/Android.mk
index 54047c9..437300e 100644
--- a/hal/audio_extn/Android.mk
+++ b/hal/audio_extn/Android.mk
@@ -51,6 +51,11 @@
 LOCAL_C_INCLUDES += $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr/include
 LOCAL_C_INCLUDES += $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr/include/audio
 LOCAL_C_INCLUDES += $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr/techpack/audio/include
+
+ifeq ($(ENABLE_AUDIO_LEGACY_TECHPACK),true)
+LOCAL_HEADER_LIBRARIES += qti_legacy_audio_kernel_uapi
+endif
+
 LOCAL_ADDITIONAL_DEPENDENCIES += $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr
 
 ifeq ($(strip $(AUDIO_FEATURE_ENABLED_DLKM)),true)
@@ -260,6 +265,11 @@
 LOCAL_C_INCLUDES += $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr/include
 LOCAL_C_INCLUDES += $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr/include/audio
 LOCAL_C_INCLUDES += $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr/techpack/audio/include
+
+ifeq ($(ENABLE_AUDIO_LEGACY_TECHPACK),true)
+LOCAL_HEADER_LIBRARIES += qti_legacy_audio_kernel_uapi
+endif
+
 LOCAL_ADDITIONAL_DEPENDENCIES += $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr
 
 ifeq ($(strip $(AUDIO_FEATURE_ENABLED_DLKM)),true)
@@ -334,6 +344,11 @@
 LOCAL_C_INCLUDES += $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr/include
 LOCAL_C_INCLUDES += $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr/include/audio
 LOCAL_C_INCLUDES += $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr/techpack/audio/include
+
+ifeq ($(ENABLE_AUDIO_LEGACY_TECHPACK),true)
+LOCAL_HEADER_LIBRARIES += qti_legacy_audio_kernel_uapi
+endif
+
 LOCAL_ADDITIONAL_DEPENDENCIES += $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr
 
 ifeq ($(strip $(AUDIO_FEATURE_ENABLED_DYNAMIC_LOG)), true)
@@ -404,6 +419,11 @@
 LOCAL_C_INCLUDES += $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr/include
 LOCAL_C_INCLUDES += $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr/include/audio
 LOCAL_C_INCLUDES += $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr/techpack/audio/include
+
+ifeq ($(ENABLE_AUDIO_LEGACY_TECHPACK),true)
+LOCAL_HEADER_LIBRARIES += qti_legacy_audio_kernel_uapi
+endif
+
 LOCAL_ADDITIONAL_DEPENDENCIES += $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr
 
 LOCAL_HEADER_LIBRARIES += libhardware_headers
@@ -461,6 +481,11 @@
 LOCAL_C_INCLUDES += $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr/include
 LOCAL_C_INCLUDES += $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr/include/audio
 LOCAL_C_INCLUDES += $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr/techpack/audio/include
+
+ifeq ($(ENABLE_AUDIO_LEGACY_TECHPACK),true)
+LOCAL_HEADER_LIBRARIES += qti_legacy_audio_kernel_uapi
+endif
+
 LOCAL_ADDITIONAL_DEPENDENCIES += $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr
 
 ifeq ($(strip $(AUDIO_FEATURE_ENABLED_DLKM)),true)
@@ -534,6 +559,11 @@
 LOCAL_C_INCLUDES += $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr/include
 LOCAL_C_INCLUDES += $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr/include/audio
 LOCAL_C_INCLUDES += $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr/techpack/audio/include
+
+ifeq ($(ENABLE_AUDIO_LEGACY_TECHPACK),true)
+LOCAL_HEADER_LIBRARIES += qti_legacy_audio_kernel_uapi
+endif
+
 LOCAL_ADDITIONAL_DEPENDENCIES += $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr
 
 ifeq ($(strip $(AUDIO_FEATURE_ENABLED_DLKM)),true)
@@ -600,6 +630,11 @@
 LOCAL_C_INCLUDES += $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr/include
 LOCAL_C_INCLUDES += $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr/include/audio
 LOCAL_C_INCLUDES += $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr/techpack/audio/include
+
+ifeq ($(ENABLE_AUDIO_LEGACY_TECHPACK),true)
+LOCAL_HEADER_LIBRARIES += qti_legacy_audio_kernel_uapi
+endif
+
 LOCAL_ADDITIONAL_DEPENDENCIES += $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr
 
 ifeq ($(strip $(AUDIO_FEATURE_ENABLED_DLKM)),true)
@@ -672,6 +707,11 @@
 LOCAL_C_INCLUDES += $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr/include
 LOCAL_C_INCLUDES += $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr/include/audio
 LOCAL_C_INCLUDES += $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr/techpack/audio/include
+
+ifeq ($(ENABLE_AUDIO_LEGACY_TECHPACK),true)
+LOCAL_HEADER_LIBRARIES += qti_legacy_audio_kernel_uapi
+endif
+
 LOCAL_ADDITIONAL_DEPENDENCIES += $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr
 
 ifeq ($(strip $(AUDIO_FEATURE_ENABLED_DLKM)),true)
@@ -738,6 +778,11 @@
 LOCAL_C_INCLUDES += $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr/include
 LOCAL_C_INCLUDES += $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr/include/audio
 LOCAL_C_INCLUDES += $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr/techpack/audio/include
+
+ifeq ($(ENABLE_AUDIO_LEGACY_TECHPACK),true)
+LOCAL_HEADER_LIBRARIES += qti_legacy_audio_kernel_uapi
+endif
+
 LOCAL_ADDITIONAL_DEPENDENCIES += $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr
 
 ifeq ($(strip $(AUDIO_FEATURE_ENABLED_DLKM)),true)
@@ -803,6 +848,11 @@
 LOCAL_C_INCLUDES += $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr/include
 LOCAL_C_INCLUDES += $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr/include/audio
 LOCAL_C_INCLUDES += $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr/techpack/audio/include
+
+ifeq ($(ENABLE_AUDIO_LEGACY_TECHPACK),true)
+LOCAL_HEADER_LIBRARIES += qti_legacy_audio_kernel_uapi
+endif
+
 LOCAL_ADDITIONAL_DEPENDENCIES += $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr
 
 ifeq ($(strip $(AUDIO_FEATURE_ENABLED_DLKM)),true)
@@ -1008,6 +1058,11 @@
 LOCAL_C_INCLUDES += $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr/include
 LOCAL_C_INCLUDES += $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr/include/audio
 LOCAL_C_INCLUDES += $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr/techpack/audio/include
+
+ifeq ($(ENABLE_AUDIO_LEGACY_TECHPACK),true)
+LOCAL_HEADER_LIBRARIES += qti_legacy_audio_kernel_uapi
+endif
+
 LOCAL_ADDITIONAL_DEPENDENCIES += $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr
 
 ifeq ($(strip $(AUDIO_FEATURE_ENABLED_DLKM)),true)
@@ -1069,6 +1124,11 @@
 LOCAL_C_INCLUDES += $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr/include
 LOCAL_C_INCLUDES += $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr/include/audio
 LOCAL_C_INCLUDES += $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr/techpack/audio/include
+
+ifeq ($(ENABLE_AUDIO_LEGACY_TECHPACK),true)
+LOCAL_HEADER_LIBRARIES += qti_legacy_audio_kernel_uapi
+endif
+
 LOCAL_ADDITIONAL_DEPENDENCIES += $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr
 
 ifeq ($(strip $(AUDIO_FEATURE_ENABLED_DLKM)),true)
@@ -1131,6 +1191,11 @@
 LOCAL_C_INCLUDES += $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr/include
 LOCAL_C_INCLUDES += $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr/include/audio
 LOCAL_C_INCLUDES += $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr/techpack/audio/include
+
+ifeq ($(ENABLE_AUDIO_LEGACY_TECHPACK),true)
+LOCAL_HEADER_LIBRARIES += qti_legacy_audio_kernel_uapi
+endif
+
 LOCAL_ADDITIONAL_DEPENDENCIES += $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr
 
 ifeq ($(strip $(AUDIO_FEATURE_ENABLED_DLKM)),true)
diff --git a/hal/audio_extn/compress_in.c b/hal/audio_extn/compress_in.c
index 8795d52..864de95 100644
--- a/hal/audio_extn/compress_in.c
+++ b/hal/audio_extn/compress_in.c
@@ -58,9 +58,6 @@
 /* default timestamp metadata definition if not defined in kernel*/
 #ifndef COMPRESSED_TIMESTAMP_FLAG
 #define COMPRESSED_TIMESTAMP_FLAG 0
-struct snd_codec_metadata {
-uint64_t timestamp;
-};
 #define compress_config_set_timstamp_flag(config) (-ENOSYS)
 #else
 #ifdef AUDIO_GKI_ENABLED
diff --git a/post_proc/Android.mk b/post_proc/Android.mk
index 94e8873..43cd094 100644
--- a/post_proc/Android.mk
+++ b/post_proc/Android.mk
@@ -108,6 +108,10 @@
         LOCAL_ADDITIONAL_DEPENDENCIES += $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr
 endif
 
+ifeq ($(ENABLE_AUDIO_LEGACY_TECHPACK),true)
+LOCAL_HEADER_LIBRARIES += qti_legacy_audio_kernel_uapi
+endif
+
 ifneq ($(filter kona lahaina holi,$(TARGET_BOARD_PLATFORM)),)
 LOCAL_SANITIZE := integer_overflow
 endif