1 files changed, 43 insertions, 0 deletions
diff --git a/third_party/libwebrtc/api/video/video_content_type.cc b/third_party/libwebrtc/api/video/video_content_type.cc
new file mode 100644
index 0000000000..79da9ff273
--- /dev/null
+++ b/third_party/libwebrtc/api/video/video_content_type.cc
@@ -0,0 +1,43 @@
+/*
+ *  Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "api/video/video_content_type.h"
+
+#include "rtc_base/checks.h"
+
+namespace webrtc {
+namespace videocontenttypehelpers {
+
+namespace {
+static constexpr uint8_t kScreenshareBitsSize = 1;
+static constexpr uint8_t kScreenshareBitsMask =
+    (1u << kScreenshareBitsSize) - 1;
+}  // namespace
+
+bool IsScreenshare(const VideoContentType& content_type) {
+  // Ensure no bits apart from the screenshare bit is set.
+  // This CHECK is a temporary measure to detect code that introduces
+  // values according to old versions.
+  RTC_CHECK((static_cast<uint8_t>(content_type) & !kScreenshareBitsMask) == 0);
+  return (static_cast<uint8_t>(content_type) & kScreenshareBitsMask) > 0;
+}
+
+bool IsValidContentType(uint8_t value) {
+  // Only the screenshare bit is allowed.
+  // However, due to previous usage of the next 5 bits, we allow
+  // the lower 6 bits to be set.
+  return value < (1 << 6);
+}
+
+const char* ToString(const VideoContentType& content_type) {
+  return IsScreenshare(content_type) ? "screen" : "realtime";
+}
+}  // namespace videocontenttypehelpers
+}  // namespace webrtc