[PPAPI][MediaStream] Support configure for video input.

ppapi/shared_impl/media_stream_video_track_shared.cc

+// Copyright 2014 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 "ppapi/shared_impl/media_stream_video_track_shared.h"
+
+#include "base/logging.h"
+
+namespace {
+
+const int32_t kMaxWidth = 4096;
+const int32_t kMaxHeight = 4096;
+
+}  // namespace
+
+namespace ppapi {
+
+// static
+bool MediaStreamVideoTrackShared::VerifyAttributes(
+    const Attributes& attributes) {
+  if (attributes.mask & Attributes::MASK_BUFFERS) {
+    if (attributes.buffers < 0)
+      return false;
+  } else if (attributes.buffers) {
+    return false;
+  }
+
+  if (attributes.mask & Attributes::MASK_FORMAT) {
+    if (attributes.format < PP_VIDEOFRAME_FORMAT_UNKNOWN ||
+        attributes.format > PP_VIDEOFRAME_FORMAT_LAST) {
+      return false;
+    }
+  } else if (attributes.format) {
+    return false;
+  }
+
+  if (attributes.mask & Attributes::MASK_WIDTH) {
+    if (attributes.width < 0 || attributes.width > kMaxWidth)
+      return false;
+    if (attributes.width & 0x3)
+      return false;
+  } else if (attributes.width) {
+    return false;
+  }
+
+  if (attributes.mask & Attributes::MASK_HEIGHT) {
+    if (attributes.height < 0 || attributes.height > kMaxHeight)
+      return false;
+    if (attributes.height & 0x3)
+      return false;
+  } else if (attributes.height) {
+    return false;
+  }
+
+  return true;
+}
+
+}  // namespace ppapi