media: add video capture device for ARC++ camera HAL v3

media/capture/video/chromeos/camera_metadata_utils.cc

Index: media/capture/video/chromeos/camera_metadata_utils.cc
diff --git a/media/capture/video/chromeos/camera_metadata_utils.cc b/media/capture/video/chromeos/camera_metadata_utils.cc
new file mode 100644
index 0000000000000000000000000000000000000000..6b7c150882e8e22f25bb9185a17f632f472491dc
--- /dev/null
+++ b/media/capture/video/chromeos/camera_metadata_utils.cc
@@ -0,0 +1,55 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "media/capture/video/chromeos/camera_metadata_utils.h"
+
+#include <set>
+
+namespace media {
+
+const arc::mojom::CameraMetadataEntryPtr* GetMetadataEntry(
+    const arc::mojom::CameraMetadataPtr& camera_metadata,
+    arc::mojom::CameraMetadataTag tag) {
+  if (!camera_metadata->entries.has_value()) {
+    return nullptr;
+  }
+  for (const auto& entry : camera_metadata->entries.value()) {
+    if (entry->tag == tag) {
+      return &entry;
+    }
+  }
+  return nullptr;
+}
+
+void MergeMetadata(arc::mojom::CameraMetadataPtr* to,
+                   const arc::mojom::CameraMetadataPtr& from) {
+  DCHECK(to);
+  (*to)->entry_count += from->entry_count;
+  (*to)->entry_capacity += from->entry_count;
+  (*to)->data_count += from->data_count;
+  (*to)->data_capacity += from->data_count;
+
+  if (!from->entries) {
+    return;
+  }
+
+  std::set<arc::mojom::CameraMetadataTag> tags;
+  if ((*to)->entries) {
+    for (const auto& entry : (*to)->entries.value()) {
+      tags.insert(entry->tag);
+    }
+  } else {
+    (*to)->entries = std::vector<arc::mojom::CameraMetadataEntryPtr>();
+  }
+  for (const auto& entry : from->entries.value()) {
+    if (tags.find(entry->tag) != tags.end()) {
+      LOG(ERROR) << "Found duplicated entries for tag " << entry->tag;
+      continue;
+    }
+    tags.insert(entry->tag);
+    (*to)->entries->push_back(entry->Clone());
+  }
+}
+
+}  // namespace media