diff --git a/media/audioaidlconversion/AidlConversionNdk.cpp b/media/audioaidlconversion/AidlConversionNdk.cpp
index 7c63339..413ae67 100644
--- a/media/audioaidlconversion/AidlConversionNdk.cpp
+++ b/media/audioaidlconversion/AidlConversionNdk.cpp
@@ -14,14 +14,18 @@
  * limitations under the License.
  */
 
+#include <sstream>
 #include <utility>
 
+#include <system/audio.h>
 #define LOG_TAG "AidlConversionNdk"
 //#define LOG_NDEBUG 0
 #include <utils/Log.h>
+#include <utils/Errors.h>
 
 #include <media/AidlConversionCppNdk.h>
 #include <media/AidlConversionNdk.h>
+#include <Utils.h>
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 // AIDL NDK backend to legacy audio data structure conversion utilities.
@@ -29,6 +33,51 @@
 namespace aidl {
 namespace android {
 
+using hardware::audio::common::PlaybackTrackMetadata;
+using hardware::audio::common::RecordTrackMetadata;
+using ::android::BAD_VALUE;
+using ::android::OK;
+
+namespace {
+
+::android::status_t combineString(
+        const std::vector<std::string>& v, char separator, std::string* result) {
+    std::ostringstream oss;
+    for (const auto& s : v) {
+        if (oss.tellp() > 0) {
+            oss << separator;
+        }
+        if (s.find(separator) == std::string::npos) {
+            oss << s;
+        } else {
+            ALOGE("%s: string \"%s\" contains separator character \"%c\"",
+                    __func__, s.c_str(), separator);
+            return BAD_VALUE;
+        }
+    }
+    *result = oss.str();
+    return OK;
+}
+
+std::vector<std::string> splitString(const std::string& s, char separator) {
+    std::istringstream iss(s);
+    std::string t;
+    std::vector<std::string> result;
+    while (std::getline(iss, t, separator)) {
+        result.push_back(std::move(t));
+    }
+    return result;
+}
+
+std::vector<std::string> filterOutNonVendorTags(const std::vector<std::string>& tags) {
+    std::vector<std::string> result;
+    std::copy_if(tags.begin(), tags.end(), std::back_inserter(result),
+            ::android::hardware::audio::common::maybeVendorExtension);
+    return result;
+}
+
+}  // namespace
+
 // buffer_provider_t is not supported thus skipped
 ConversionResult<buffer_config_t> aidl2legacy_AudioConfigBase_buffer_config_t(
         const media::audio::common::AudioConfigBase& aidl, bool isInput) {
@@ -68,5 +117,79 @@
     return aidl;
 }
 
+::android::status_t aidl2legacy_AudioAttributesTags(
+        const std::vector<std::string>& aidl, char* legacy) {
+    std::string aidlTags;
+    RETURN_STATUS_IF_ERROR(combineString(
+                    filterOutNonVendorTags(aidl), AUDIO_ATTRIBUTES_TAGS_SEPARATOR, &aidlTags));
+    RETURN_STATUS_IF_ERROR(aidl2legacy_string(aidlTags, legacy, AUDIO_ATTRIBUTES_TAGS_MAX_SIZE));
+    return OK;
+}
+
+ConversionResult<std::vector<std::string>> legacy2aidl_AudioAttributesTags(const char* legacy) {
+    std::string legacyTags = VALUE_OR_RETURN(legacy2aidl_string(
+                    legacy, AUDIO_ATTRIBUTES_TAGS_MAX_SIZE));
+    return filterOutNonVendorTags(splitString(legacyTags, AUDIO_ATTRIBUTES_TAGS_SEPARATOR));
+}
+
+ConversionResult<playback_track_metadata_v7>
+aidl2legacy_PlaybackTrackMetadata_playback_track_metadata_v7(const PlaybackTrackMetadata& aidl) {
+    playback_track_metadata_v7 legacy;
+    legacy.base.usage = VALUE_OR_RETURN(aidl2legacy_AudioUsage_audio_usage_t(aidl.usage));
+    legacy.base.content_type = VALUE_OR_RETURN(aidl2legacy_AudioContentType_audio_content_type_t(
+                    aidl.contentType));
+    legacy.base.gain = aidl.gain;
+    legacy.channel_mask = VALUE_OR_RETURN(aidl2legacy_AudioChannelLayout_audio_channel_mask_t(
+                    aidl.channelMask, false /*isInput*/));
+    RETURN_IF_ERROR(aidl2legacy_AudioAttributesTags(aidl.tags, legacy.tags));
+    return legacy;
+}
+
+ConversionResult<PlaybackTrackMetadata>
+legacy2aidl_playback_track_metadata_v7_PlaybackTrackMetadata(
+        const playback_track_metadata_v7& legacy) {
+    PlaybackTrackMetadata aidl;
+    aidl.usage = VALUE_OR_RETURN(legacy2aidl_audio_usage_t_AudioUsage(legacy.base.usage));
+    aidl.contentType = VALUE_OR_RETURN(legacy2aidl_audio_content_type_t_AudioContentType(
+                    legacy.base.content_type));
+    aidl.gain = legacy.base.gain;
+    aidl.channelMask = VALUE_OR_RETURN(legacy2aidl_audio_channel_mask_t_AudioChannelLayout(
+                    legacy.channel_mask, false /*isInput*/));
+    aidl.tags = VALUE_OR_RETURN(legacy2aidl_AudioAttributesTags(legacy.tags));
+    return aidl;
+}
+
+ConversionResult<record_track_metadata_v7>
+aidl2legacy_RecordTrackMetadata_record_track_metadata_v7(const RecordTrackMetadata& aidl) {
+    record_track_metadata_v7 legacy;
+    legacy.base.source = VALUE_OR_RETURN(aidl2legacy_AudioSource_audio_source_t(aidl.source));
+    legacy.base.gain = aidl.gain;
+    if (aidl.destinationDevice.has_value()) {
+        RETURN_IF_ERROR(aidl2legacy_AudioDevice_audio_device(aidl.destinationDevice.value(),
+                        &legacy.base.dest_device, legacy.base.dest_device_address));
+    } else {
+        legacy.base.dest_device = AUDIO_DEVICE_NONE;
+    }
+    legacy.channel_mask = VALUE_OR_RETURN(aidl2legacy_AudioChannelLayout_audio_channel_mask_t(
+                    aidl.channelMask, true /*isInput*/));
+    RETURN_IF_ERROR(aidl2legacy_AudioAttributesTags(aidl.tags, legacy.tags));
+    return legacy;
+}
+
+ConversionResult<RecordTrackMetadata>
+legacy2aidl_record_track_metadata_v7_RecordTrackMetadata(const record_track_metadata_v7& legacy) {
+    RecordTrackMetadata aidl;
+    aidl.source = VALUE_OR_RETURN(legacy2aidl_audio_source_t_AudioSource(legacy.base.source));
+    aidl.gain = legacy.base.gain;
+    if (legacy.base.dest_device != AUDIO_DEVICE_NONE) {
+        aidl.destinationDevice = VALUE_OR_RETURN(legacy2aidl_audio_device_AudioDevice(
+                        legacy.base.dest_device, legacy.base.dest_device_address));
+    }
+    aidl.channelMask = VALUE_OR_RETURN(legacy2aidl_audio_channel_mask_t_AudioChannelLayout(
+                    legacy.channel_mask, true /*isInput*/));
+    aidl.tags = VALUE_OR_RETURN(legacy2aidl_AudioAttributesTags(legacy.tags));
+    return aidl;
+}
+
 }  // namespace android
 }  // aidl