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      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef REMOTING_CLIENT_AUDIO_PLAYER_H_
      6 #define REMOTING_CLIENT_AUDIO_PLAYER_H_
      7 
      8 #include <list>
      9 
     10 #include "base/memory/scoped_ptr.h"
     11 #include "base/synchronization/lock.h"
     12 #include "remoting/proto/audio.pb.h"
     13 
     14 namespace remoting {
     15 
     16 class AudioPlayer {
     17  public:
     18   virtual ~AudioPlayer();
     19 
     20   void ProcessAudioPacket(scoped_ptr<AudioPacket> packet);
     21 
     22  protected:
     23   AudioPlayer();
     24 
     25   // Return the recommended number of samples to include in a frame.
     26   virtual uint32 GetSamplesPerFrame() = 0;
     27 
     28   // Resets the audio player and starts playback.
     29   // Returns true on success.
     30   virtual bool ResetAudioPlayer(AudioPacket::SamplingRate sampling_rate) = 0;
     31 
     32   // Function called by the browser when it needs more audio samples.
     33   static void AudioPlayerCallback(void* samples,
     34                                   uint32 buffer_size,
     35                                   void* data);
     36 
     37  private:
     38   friend class AudioPlayerTest;
     39 
     40   typedef std::list<AudioPacket*> AudioPacketQueue;
     41 
     42   void ResetQueue();
     43   void FillWithSamples(void* samples, uint32 buffer_size);
     44 
     45   AudioPacket::SamplingRate sampling_rate_;
     46 
     47   bool start_failed_;
     48 
     49   // Protects |queued_packets_|, |queued_samples_ and |bytes_consumed_|. This is
     50   // necessary to prevent races, because Pepper will call the  callback on a
     51   // separate thread.
     52   base::Lock lock_;
     53 
     54   AudioPacketQueue queued_packets_;
     55   int queued_bytes_;
     56 
     57   // The number of bytes from |queued_packets_| that have been consumed.
     58   size_t bytes_consumed_;
     59 
     60   DISALLOW_COPY_AND_ASSIGN(AudioPlayer);
     61 };
     62 
     63 }  // namespace remoting
     64 
     65 #endif  // REMOTING_CLIENT_AUDIO_PLAYER_H_
     66