Moving Encoder and Decoder to remoting/base

Putting Encder and Decoder together so we can have test that tests both
of them.

TEST=remoting_unittests

Review URL: http://codereview.chromium.org/2840036

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@53427 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 61 insertions, 0 deletions

diff --git a/remoting/base/encoder.h b/remoting/base/encoder.h
new file mode 100644
index 0000000..0c1fd50f
--- /dev/null
+++ b/remoting/base/encoder.h
@@ -0,0 +1,61 @@
+// Copyright (c) 2010 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 REMOTING_BASE_ENCODER_H_
+#define REMOTING_BASE_ENCODER_H_
+
+#include "base/basictypes.h"
+#include "base/callback.h"
+#include "media/base/data_buffer.h"
+#include "remoting/base/protocol/chromotocol.pb.h"
+
+namespace media {
+  class DataBuffer;
+}
+
+namespace remoting {
+
+class CaptureData;
+class HostMessage;
+
+// A class to perform the task of encoding a continous stream of
+// images.
+// This class operates asynchronously to enable maximum throughput.
+class Encoder {
+ public:
+
+  // EncodingState is a bitfield that tracks the state of the encoding.
+  // An encoding that consists of a single block could concievably be starting
+  // inprogress and ended at the same time.
+  enum {
+    EncodingStarting = 1 << 0,
+    EncodingInProgress = 1 << 1,
+    EncodingEnded = 1 << 2
+  };
+  typedef int EncodingState;
+
+  // DataAvailableCallback is called as blocks of data are made available
+  // from the encoder. Data made available by the encoder is in the form
+  // of HostMessage to reduce the amount of memory copies.
+  // The callback takes ownership of the HostMessage and is responsible for
+  // deleting it.
+  typedef Callback2<HostMessage*, EncodingState>::Type DataAvailableCallback;
+
+  virtual ~Encoder() {}
+
+  // Encode an image stored in |capture_data|.
+  //
+  // If |key_frame| is true, the encoder should not reference
+  // previous encode and encode the full frame.
+  //
+  // When encoded data is available, partial or full |data_available_callback|
+  // is called.
+  virtual void Encode(scoped_refptr<CaptureData> capture_data,
+                      bool key_frame,
+                      DataAvailableCallback* data_available_callback) = 0;
+};
+
+}  // namespace remoting
+
+#endif  // REMOTING_BASE_ENCODER_H_