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

media/capture/video/chromeos/camera_metadata_utils.cc

+// 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"
+
+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& e : camera_metadata->entries.value()) {
+    if (e->tag == tag) {
+      return &e;
+    }
+  }
+  return nullptr;
+}
+
+void MergeMetadata(arc::mojom::CameraMetadataPtr* to,
+                   const arc::mojom::CameraMetadataPtr& from) {
+  DCHECK(to);
+  arc::mojom::CameraMetadataPtr result = arc::mojom::CameraMetadata::New();

[wuchengli, 2017/05/18 02:43:05]

remove. unused

[jcliang, 2017/05/22 13:54:13]

Done.

+  (*to)->entry_count += from->entry_count;
+  (*to)->entry_capacity += from->entry_count;
+  (*to)->data_count += from->data_count;
+  (*to)->data_capacity += from->data_count;
+  std::set<arc::mojom::CameraMetadataTag> tags;
+

[wuchengli, 2017/05/18 02:43:05]

if (!from->entries.has_value())
  return;

[jcliang, 2017/05/22 13:54:13]

Done.

+  if ((*to)->entries.has_value()) {
+    for (const auto& e : (*to)->entries.value()) {
+      tags.insert(e->tag);
+    }
+  }
+
+  if (from->entries.has_value()) {
+    if (!(*to)->entries.has_value()) {
+      (*to)->entries = std::vector<arc::mojom::CameraMetadataEntryPtr>();
+    }
+    for (const auto& e : from->entries.value()) {

[wuchengli, 2017/05/18 02:43:05]

s/e/entry/

[jcliang, 2017/05/22 13:54:13]

Done.

+      if (tags.find(e->tag) != tags.end()) {
+        LOG(ERROR) << "Found duplicated entries for tag " << e->tag;
+        continue;
+      }
+      tags.insert(e->tag);
+      (*to)->entries->push_back(e->Clone());
+    }
+  }
+}
+
+}  // namespace media