diff --git a/services/mediacodec/registrant/Android.bp b/services/mediacodec/registrant/Android.bp
index ad03e68..0441cfa 100644
--- a/services/mediacodec/registrant/Android.bp
+++ b/services/mediacodec/registrant/Android.bp
@@ -14,6 +14,10 @@
     ],
     shared_libs: [
         "libbase",
+        "libcodec2_hidl@1.0",
+        "libcodec2_vndk",
+        "libhidlbase",
+        "libutils",
     ],
 
     // Codecs
diff --git a/services/mediacodec/registrant/CodecServiceRegistrant.cpp b/services/mediacodec/registrant/CodecServiceRegistrant.cpp
index 58db801e..83d233e 100644
--- a/services/mediacodec/registrant/CodecServiceRegistrant.cpp
+++ b/services/mediacodec/registrant/CodecServiceRegistrant.cpp
@@ -18,21 +18,410 @@
 #define LOG_TAG "CodecServiceRegistrant"
 
 #include <android-base/logging.h>
+#include <android-base/properties.h>
 
+#include <C2Component.h>
 #include <C2PlatformSupport.h>
 #include <codec2/hidl/1.1/ComponentStore.h>
+#include <codec2/hidl/1.1/Configurable.h>
+#include <codec2/hidl/1.1/types.h>
+#include <hidl/HidlSupport.h>
 #include <media/CodecServiceRegistrant.h>
 
+namespace /* unnamed */ {
+
+using ::android::hardware::hidl_vec;
+using ::android::hardware::hidl_string;
+using ::android::hardware::Return;
+using ::android::hardware::Void;
+using ::android::sp;
+using namespace ::android::hardware::media::c2::V1_1;
+using namespace ::android::hardware::media::c2::V1_1::utils;
+
+constexpr c2_status_t C2_TRANSACTION_FAILED = C2_CORRUPTED;
+
+// Converter from IComponentStore to C2ComponentStore.
+class H2C2ComponentStore : public C2ComponentStore {
+protected:
+    sp<IComponentStore> mStore;
+    sp<IConfigurable> mConfigurable;
+public:
+    explicit H2C2ComponentStore(sp<IComponentStore> const& store)
+          : mStore{store},
+            mConfigurable{[store]() -> sp<IConfigurable>{
+                if (!store) {
+                    return nullptr;
+                }
+                Return<sp<IConfigurable>> transResult =
+                    store->getConfigurable();
+                return transResult.isOk() ?
+                        static_cast<sp<IConfigurable>>(transResult) :
+                        nullptr;
+            }()} {
+        if (!mConfigurable) {
+            LOG(ERROR) << "Preferred store is corrupted.";
+        }
+    }
+
+    virtual ~H2C2ComponentStore() override = default;
+
+    virtual c2_status_t config_sm(
+            std::vector<C2Param*> const &params,
+            std::vector<std::unique_ptr<C2SettingResult>>* const failures
+            ) override {
+        Params hidlParams;
+        if (!createParamsBlob(&hidlParams, params)) {
+            LOG(ERROR) << "config -- bad input.";
+            return C2_TRANSACTION_FAILED;
+        }
+        c2_status_t status{};
+        Return<void> transResult = mConfigurable->config(
+                hidlParams,
+                true,
+                [&status, &params, failures](
+                        Status s,
+                        const hidl_vec<SettingResult> f,
+                        const Params& o) {
+                    status = static_cast<c2_status_t>(s);
+                    if (status != C2_OK && status != C2_BAD_INDEX) {
+                        LOG(DEBUG) << "config -- call failed: "
+                                   << status << ".";
+                    }
+                    size_t i = failures->size();
+                    failures->resize(i + f.size());
+                    for (const SettingResult& sf : f) {
+                        if (!objcpy(&(*failures)[i++], sf)) {
+                            LOG(ERROR) << "config -- "
+                                       << "invalid SettingResult returned.";
+                            return;
+                        }
+                    }
+                    if (!updateParamsFromBlob(params, o)) {
+                        LOG(ERROR) << "config -- "
+                                   << "failed to parse returned params.";
+                        status = C2_CORRUPTED;
+                    }
+                });
+        if (!transResult.isOk()) {
+            LOG(ERROR) << "config -- transaction failed.";
+            return C2_TRANSACTION_FAILED;
+        }
+        return status;
+    };
+
+    virtual c2_status_t copyBuffer(
+            std::shared_ptr<C2GraphicBuffer>,
+            std::shared_ptr<C2GraphicBuffer>) override {
+        LOG(ERROR) << "copyBuffer -- not supported.";
+        return C2_OMITTED;
+    }
+
+    virtual c2_status_t createComponent(
+            C2String, std::shared_ptr<C2Component> *const component) override {
+        component->reset();
+        LOG(ERROR) << "createComponent -- not supported.";
+        return C2_OMITTED;
+    }
+
+    virtual c2_status_t createInterface(
+            C2String, std::shared_ptr<C2ComponentInterface> *const interface) {
+        interface->reset();
+        LOG(ERROR) << "createInterface -- not supported.";
+        return C2_OMITTED;
+    }
+
+    virtual c2_status_t query_sm(
+            const std::vector<C2Param *> &stackParams,
+            const std::vector<C2Param::Index> &heapParamIndices,
+            std::vector<std::unique_ptr<C2Param>> *const heapParams) const
+            override {
+        hidl_vec<ParamIndex> indices(
+                stackParams.size() + heapParamIndices.size());
+        size_t numIndices = 0;
+        for (C2Param* const& stackParam : stackParams) {
+            if (!stackParam) {
+                LOG(WARNING) << "query -- null stack param encountered.";
+                continue;
+            }
+            indices[numIndices++] = static_cast<ParamIndex>(stackParam->index());
+        }
+        size_t numStackIndices = numIndices;
+        for (const C2Param::Index& index : heapParamIndices) {
+            indices[numIndices++] =
+                    static_cast<ParamIndex>(static_cast<uint32_t>(index));
+        }
+        indices.resize(numIndices);
+        if (heapParams) {
+            heapParams->reserve(heapParams->size() + numIndices);
+        }
+        c2_status_t status;
+        Return<void> transResult = mConfigurable->query(
+                indices,
+                true,
+                [&status, &numStackIndices, &stackParams, heapParams](
+                        Status s, const Params& p) {
+                    status = static_cast<c2_status_t>(s);
+                    if (status != C2_OK && status != C2_BAD_INDEX) {
+                        LOG(DEBUG) << "query -- call failed: "
+                                   << status << ".";
+                        return;
+                    }
+                    std::vector<C2Param*> paramPointers;
+                    if (!parseParamsBlob(&paramPointers, p)) {
+                        LOG(ERROR) << "query -- error while parsing params.";
+                        status = C2_CORRUPTED;
+                        return;
+                    }
+                    size_t i = 0;
+                    for (auto it = paramPointers.begin();
+                            it != paramPointers.end(); ) {
+                        C2Param* paramPointer = *it;
+                        if (numStackIndices > 0) {
+                            --numStackIndices;
+                            if (!paramPointer) {
+                                LOG(WARNING) << "query -- null stack param.";
+                                ++it;
+                                continue;
+                            }
+                            for (; i < stackParams.size() && !stackParams[i]; ) {
+                                ++i;
+                            }
+                            if (i >= stackParams.size()) {
+                                LOG(ERROR) << "query -- unexpected error.";
+                                status = C2_CORRUPTED;
+                                return;
+                            }
+                            if (stackParams[i]->index() != paramPointer->index()) {
+                                LOG(WARNING) << "query -- param skipped: "
+                                                "index = "
+                                             << stackParams[i]->index() << ".";
+                                stackParams[i++]->invalidate();
+                                continue;
+                            }
+                            if (!stackParams[i++]->updateFrom(*paramPointer)) {
+                                LOG(WARNING) << "query -- param update failed: "
+                                                "index = "
+                                             << paramPointer->index() << ".";
+                            }
+                        } else {
+                            if (!paramPointer) {
+                                LOG(WARNING) << "query -- null heap param.";
+                                ++it;
+                                continue;
+                            }
+                            if (!heapParams) {
+                                LOG(WARNING) << "query -- "
+                                                "unexpected extra stack param.";
+                            } else {
+                                heapParams->emplace_back(
+                                        C2Param::Copy(*paramPointer));
+                            }
+                        }
+                        ++it;
+                    }
+                });
+        if (!transResult.isOk()) {
+            LOG(ERROR) << "query -- transaction failed.";
+            return C2_TRANSACTION_FAILED;
+        }
+        return status;
+    }
+
+    virtual c2_status_t querySupportedParams_nb(
+            std::vector<std::shared_ptr<C2ParamDescriptor>> *const params) const {
+        c2_status_t status;
+        Return<void> transResult = mConfigurable->querySupportedParams(
+                std::numeric_limits<uint32_t>::min(),
+                std::numeric_limits<uint32_t>::max(),
+                [&status, params](
+                        Status s,
+                        const hidl_vec<ParamDescriptor>& p) {
+                    status = static_cast<c2_status_t>(s);
+                    if (status != C2_OK) {
+                        LOG(DEBUG) << "querySupportedParams -- call failed: "
+                                   << status << ".";
+                        return;
+                    }
+                    size_t i = params->size();
+                    params->resize(i + p.size());
+                    for (const ParamDescriptor& sp : p) {
+                        if (!objcpy(&(*params)[i++], sp)) {
+                            LOG(ERROR) << "querySupportedParams -- "
+                                       << "invalid returned ParamDescriptor.";
+                            return;
+                        }
+                    }
+                });
+        if (!transResult.isOk()) {
+            LOG(ERROR) << "querySupportedParams -- transaction failed.";
+            return C2_TRANSACTION_FAILED;
+        }
+        return status;
+    }
+
+    virtual c2_status_t querySupportedValues_sm(
+            std::vector<C2FieldSupportedValuesQuery> &fields) const {
+        hidl_vec<FieldSupportedValuesQuery> inFields(fields.size());
+        for (size_t i = 0; i < fields.size(); ++i) {
+            if (!objcpy(&inFields[i], fields[i])) {
+                LOG(ERROR) << "querySupportedValues -- bad input";
+                return C2_TRANSACTION_FAILED;
+            }
+        }
+
+        c2_status_t status;
+        Return<void> transResult = mConfigurable->querySupportedValues(
+                inFields,
+                true,
+                [&status, &inFields, &fields](
+                        Status s,
+                        const hidl_vec<FieldSupportedValuesQueryResult>& r) {
+                    status = static_cast<c2_status_t>(s);
+                    if (status != C2_OK) {
+                        LOG(DEBUG) << "querySupportedValues -- call failed: "
+                                   << status << ".";
+                        return;
+                    }
+                    if (r.size() != fields.size()) {
+                        LOG(ERROR) << "querySupportedValues -- "
+                                      "input and output lists "
+                                      "have different sizes.";
+                        status = C2_CORRUPTED;
+                        return;
+                    }
+                    for (size_t i = 0; i < fields.size(); ++i) {
+                        if (!objcpy(&fields[i], inFields[i], r[i])) {
+                            LOG(ERROR) << "querySupportedValues -- "
+                                          "invalid returned value.";
+                            status = C2_CORRUPTED;
+                            return;
+                        }
+                    }
+                });
+        if (!transResult.isOk()) {
+            LOG(ERROR) << "querySupportedValues -- transaction failed.";
+            return C2_TRANSACTION_FAILED;
+        }
+        return status;
+    }
+
+    virtual C2String getName() const {
+        C2String outName;
+        Return<void> transResult = mConfigurable->getName(
+                [&outName](const hidl_string& name) {
+                    outName = name.c_str();
+                });
+        if (!transResult.isOk()) {
+            LOG(ERROR) << "getName -- transaction failed.";
+        }
+        return outName;
+    }
+
+    virtual std::shared_ptr<C2ParamReflector> getParamReflector() const
+            override {
+        struct SimpleParamReflector : public C2ParamReflector {
+            virtual std::unique_ptr<C2StructDescriptor> describe(
+                    C2Param::CoreIndex coreIndex) const {
+                hidl_vec<ParamIndex> indices(1);
+                indices[0] = static_cast<ParamIndex>(coreIndex.coreIndex());
+                std::unique_ptr<C2StructDescriptor> descriptor;
+                Return<void> transResult = mBase->getStructDescriptors(
+                        indices,
+                        [&descriptor](
+                                Status s,
+                                const hidl_vec<StructDescriptor>& sd) {
+                            c2_status_t status = static_cast<c2_status_t>(s);
+                            if (status != C2_OK) {
+                                LOG(DEBUG) << "SimpleParamReflector -- "
+                                              "getStructDescriptors() failed: "
+                                           << status << ".";
+                                descriptor.reset();
+                                return;
+                            }
+                            if (sd.size() != 1) {
+                                LOG(DEBUG) << "SimpleParamReflector -- "
+                                              "getStructDescriptors() "
+                                              "returned vector of size "
+                                           << sd.size() << ". "
+                                              "It should be 1.";
+                                descriptor.reset();
+                                return;
+                            }
+                            if (!objcpy(&descriptor, sd[0])) {
+                                LOG(DEBUG) << "SimpleParamReflector -- "
+                                              "getStructDescriptors() returned "
+                                              "corrupted data.";
+                                descriptor.reset();
+                                return;
+                            }
+                        });
+                return descriptor;
+            }
+
+            explicit SimpleParamReflector(sp<IComponentStore> base)
+                : mBase(base) { }
+
+            sp<IComponentStore> mBase;
+        };
+
+        return std::make_shared<SimpleParamReflector>(mStore);
+    }
+
+    virtual std::vector<std::shared_ptr<const C2Component::Traits>>
+            listComponents() override {
+        LOG(ERROR) << "listComponents -- not supported.";
+        return {};
+    }
+};
+
+bool ionPropertiesDefined() {
+    using namespace ::android::base;
+    std::string heapMask =
+        GetProperty("ro.com.android.media.swcodec.ion.heapmask", "undefined");
+    std::string flags =
+        GetProperty("ro.com.android.media.swcodec.ion.flags", "undefined");
+    std::string align =
+        GetProperty("ro.com.android.media.swcodec.ion.align", "undefined");
+    if (heapMask != "undefined" ||
+            flags != "undefined" ||
+            align != "undefined") {
+        LOG(INFO)
+                << "Some system properties for mediaswcodec ION usage are set: "
+                << "heapmask = " << heapMask << ", "
+                << "flags = " << flags << ", "
+                << "align = " << align << ". "
+                << "Preferred Codec2 store is defaulted to \"software\".";
+        return true;
+    }
+    return false;
+}
+
+} // unnamed namespace
+
 extern "C" void RegisterCodecServices() {
     using namespace ::android::hardware::media::c2::V1_1;
     LOG(INFO) << "Creating software Codec2 service...";
-    android::sp<IComponentStore> store =
-        new utils::ComponentStore(
-                android::GetCodec2PlatformComponentStore());
+    sp<ComponentStore> store =
+        new ComponentStore(::android::GetCodec2PlatformComponentStore());
     if (store == nullptr) {
         LOG(ERROR) <<
                 "Cannot create software Codec2 service.";
     } else {
+        if (!ionPropertiesDefined()) {
+            std::string preferredStoreName = "default";
+            sp<IComponentStore> preferredStore =
+                IComponentStore::getService(preferredStoreName.c_str());
+            if (preferredStore) {
+                ::android::SetPreferredCodec2ComponentStore(
+                        std::make_shared<H2C2ComponentStore>(preferredStore));
+                LOG(INFO) <<
+                        "Preferred Codec2 store is set to \"" <<
+                        preferredStoreName << "\".";
+            } else {
+                LOG(INFO) <<
+                        "Preferred Codec2 store is defaulted to \"software\".";
+            }
+        }
         if (store->registerAsService("software") != android::OK) {
             LOG(ERROR) <<
                     "Cannot register software Codec2 service.";