Add a new incremental parsing API

Change-Id: I6b921766836d58df0281fb23b2add3f62a478e14

webm_parser/src/seek_parser.h

@@ -0,0 +1,37 @@
+// Copyright (c) 2016 The WebM 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.
+#ifndef SRC_SEEK_PARSER_H_
+#define SRC_SEEK_PARSER_H_
+
+#include "src/id_element_parser.h"
+#include "src/int_parser.h"
+#include "src/master_value_parser.h"
+#include "webm/dom_types.h"
+#include "webm/id.h"
+
+namespace webm {
+
+// Spec reference:
+// http://matroska.org/technical/specs/index.html#Seek
+// http://www.webmproject.org/docs/container/#Seek
+class SeekParser : public MasterValueParser<Seek> {
+ public:
+  SeekParser()
+      : MasterValueParser<Seek>(
+            MakeChild<IdElementParser>(Id::kSeekId, &Seek::id),
+            MakeChild<UnsignedIntParser>(Id::kSeekPosition, &Seek::position)) {}
+
+ protected:
+  Status OnParseCompleted(Callback* callback) override {
+    return callback->OnSeek(metadata(Id::kSeek), value());
+  }
+};
+
+}  // namespace webm
+
+#endif  // SRC_SEEK_PARSER_H_