Add the copresence DirectiveHandler.

components/copresence/handlers/audio/audio_directive_handler.h

+// 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.
+
+#ifndef COMPONENTS_COPRESENCE_HANDLERS_AUDIO_AUDIO_DIRECTIVE_HANDLER_
+#define COMPONENTS_COPRESENCE_HANDLERS_AUDIO_AUDIO_DIRECTIVE_HANDLER_
+
+#include <vector>
+
+#include "base/basictypes.h"
+#include "base/macros.h"
+#include "base/memory/ref_counted.h"
+#include "base/time/time.h"
+#include "base/timer/timer.h"
+#include "components/copresence/handlers/audio/audio_directive_list.h"
+#include "components/copresence/mediums/audio/audio_recorder.h"
+#include "components/copresence/proto/data.pb.h"
+
+namespace media {
+class AudioBusRefCounted;
+}
+
+namespace copresence {
+
+class AudioPlayer;
+
+// The AudioDirectiveHandler handles audio transmit and receive instructions.
+class AudioDirectiveHandler {
+ public:
+  AudioDirectiveHandler(
+      const AudioRecorder::DecodeSamplesCallback& decode_cb,
+      const AudioDirectiveList::EncodeTokenCallback& encode_cb);
+  virtual ~AudioDirectiveHandler();
+
+  // Do not use this class before calling this.
+  void Initialize();
+
+  // Adds in instruction to our handler. The instruction will execute and be

[Daniel Erat, 2014/08/05 16:38:51]

nit: s/in/an/

[rkc, 2014/08/05 18:00:35]

Done.

+  // removed after the ttl expires.
+  void AddInstruction(const copresence::TokenInstruction& instruction,
+                      base::TimeDelta ttl_ms);
+
+ protected:
+  // Protected and virtual since we want to be able to mock these out.
+  virtual void PlayAudio(
+      const scoped_refptr<media::AudioBusRefCounted>& samples,
+      base::TimeDelta duration);
+  virtual void RecordAudio(base::TimeDelta duration);
+
+ private:
+  void StopPlayback();
+  void StopRecording();
+
+  // Execute the next active transmit instruction.
+  void ExecuteNextTransmit();
+  // Execute the next active receive instruction.
+  void ExecuteNextReceive();
+
+  AudioDirectiveList directive_list_;
+
+  AudioPlayer* player_;

[Daniel Erat, 2014/08/05 16:38:51]

nit: add a comment describing ownership of these bare pointers

[rkc, 2014/08/05 18:00:35]

Done.

+  AudioRecorder* recorder_;
+
+  AudioRecorder::DecodeSamplesCallback decode_cb_;
+
+  base::OneShotTimer<AudioDirectiveHandler> stop_playback_timer_;
+  base::OneShotTimer<AudioDirectiveHandler> stop_recording_timer_;
+
+  DISALLOW_COPY_AND_ASSIGN(AudioDirectiveHandler);
+};
+
+}  // namespace copresence
+
+#endif  // COMPONENTS_COPRESENCE_HANDLERS_AUDIO_AUDIO_DIRECTIVE_HANDLER_