1 files changed, 67 insertions, 0 deletions
diff --git a/media/webm/webm_stream_parser.h b/media/webm/webm_stream_parser.h
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+++ b/media/webm/webm_stream_parser.h
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+// Copyright (c) 2012 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.
+
+#ifndef MEDIA_WEBM_WEBM_STREAM_PARSER_H_
+#define MEDIA_WEBM_WEBM_STREAM_PARSER_H_
+
+#include "base/callback_forward.h"
+#include "base/memory/ref_counted.h"
+#include "media/base/audio_decoder_config.h"
+#include "media/base/buffers.h"
+#include "media/base/stream_parser.h"
+#include "media/base/video_decoder_config.h"
+#include "media/webm/webm_cluster_parser.h"
+
+namespace media {
+
+class WebMStreamParser : public StreamParser {
+ public:
+  WebMStreamParser();
+  virtual ~WebMStreamParser();
+
+  // StreamParser implementation.
+  virtual void Init(const InitCB& init_cb, StreamParserHost* host) OVERRIDE;
+  virtual void Flush() OVERRIDE;
+  virtual int Parse(const uint8* buf, int size) OVERRIDE;
+
+ private:
+  enum State {
+    WAITING_FOR_INIT,
+    PARSING_HEADERS,
+    PARSING_CLUSTERS
+  };
+
+  void ChangeState(State new_state);
+
+  // Parses WebM Header, Info, Tracks elements. It also skips other level 1
+  // elements that are not used right now. Once the Info & Tracks elements have
+  // been parsed, this method will transition the parser from PARSING_HEADERS to
+  // PARSING_CLUSTERS.
+  //
+  // Returns < 0 if the parse fails.
+  // Returns 0 if more data is needed.
+  // Returning > 0 indicates success & the number of bytes parsed.
+  int ParseInfoAndTracks(const uint8* data, int size);
+
+  // Incrementally parses WebM cluster elements. This method also skips
+  // CUES elements if they are encountered since we currently don't use the
+  // data in these elements.
+  //
+  // Returns < 0 if the parse fails.
+  // Returns 0 if more data is needed.
+  // Returning > 0 indicates success & the number of bytes parsed.
+  int ParseCluster(const uint8* data, int size);
+
+  State state_;
+  InitCB init_cb_;
+  StreamParserHost* host_;
+
+  scoped_ptr<WebMClusterParser> cluster_parser_;
+
+  DISALLOW_COPY_AND_ASSIGN(WebMStreamParser);
+};
+
+}  // namespace media
+
+#endif  // MEDIA_WEBM_WEBM_STREAM_PARSER_H_