DrmStatus: refactor string ctor

Bug: 249941041
Test: MediaDrmParameterizedTests
Change-Id: Id87719324c06f99ee16807e73e4d42f40eb83275
diff --git a/drm/libmediadrm/DrmStatus.cpp b/drm/libmediadrm/DrmStatus.cpp
new file mode 100644
index 0000000..0258801
--- /dev/null
+++ b/drm/libmediadrm/DrmStatus.cpp
@@ -0,0 +1,51 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <mediadrm/DrmStatus.h>
+#include <json/json.h>
+
+namespace android {
+
+DrmStatus::DrmStatus(status_t err, const char *msg) : mStatus(err) {
+    Json::Value errorDetails;
+    Json::Reader reader;
+    if (!reader.parse(msg, errorDetails)) {
+        mErrMsg = msg;
+        return;
+    }
+
+    std::string errMsg;
+    auto val = errorDetails["cdmError"];
+    if (!val.isNull()) {
+        mCdmErr = val.asInt();
+    }
+    val = errorDetails["oemError"];
+    if (!val.isNull()) {
+        mOemErr = val.asInt();
+    }
+    val = errorDetails["context"];
+    if (!val.isNull()) {
+        mCtx = val.asInt();
+    }
+    val = errorDetails["errorMessage"];
+    if (!val.isNull()) {
+        mErrMsg = val.asString();
+    } else {
+        mErrMsg = msg;
+    }
+}
+
+}  // namespace android