Fix an issue that audio and video may run out of sync

media/base/android/audio_decoder_job.h

 // Copyright 2013 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_BASE_ANDROID_AUDIO_DECODER_JOB_H_
 #define MEDIA_BASE_ANDROID_AUDIO_DECODER_JOB_H_
 
 #include <jni.h>
 
 #include "media/base/android/media_decoder_job.h"
 
 namespace media {
 
 class AudioCodecBridge;
+class AudioTimestampHelper;
 
 // Class for managing audio decoding jobs.
 class AudioDecoderJob : public MediaDecoderJob {
  public:
   virtual ~AudioDecoderJob();
 
   // Creates a new AudioDecoderJob instance for decoding audio.
   // |audio_codec| - The audio format the object needs to decode.
   // |sample_rate| - The sample rate of the decoded output.
   // |channel_count| - The number of channels in the decoded output.
   // |extra_data|, |extra_data_size| - Extra data buffer needed for initializing
   // the decoder.
   // |media_crypto| - Handle to a Java object that handles the encryption for
   // the audio data.
   // |request_data_cb| - Callback used to request more data for the decoder.
   static AudioDecoderJob* Create(
       const AudioCodec audio_codec, int sample_rate, int channel_count,
       const uint8* extra_data, size_t extra_data_size, jobject media_crypto,
       const base::Closure& request_data_cb);
 
   void SetVolume(double volume);
 
+  // Sets the base timestamp for |audio_timestamp_helper_|.
+  void SetBaseTimestamp(base::TimeDelta base_timestamp);
+
  private:
-  AudioDecoderJob(scoped_ptr<AudioCodecBridge> audio_decoder_bridge,
+  AudioDecoderJob(scoped_ptr<AudioTimestampHelper> audio_timestamp_helper,
+                  scoped_ptr<AudioCodecBridge> audio_decoder_bridge,
+                  int bytes_per_frame,
                   const base::Closure& request_data_cb);
 
   // MediaDecoderJob implementation.
   virtual void ReleaseOutputBuffer(
       int output_buffer_index,
       size_t size,
       bool render_output,
+      base::TimeDelta current_presentation_timestamp,
       const ReleaseOutputCompletionCallback& callback) OVERRIDE;
 
   virtual bool ComputeTimeToRender() const OVERRIDE;
 
+  // number of bytes per audio frame;
+  int bytes_per_frame_;
+
   scoped_ptr<AudioCodecBridge> audio_codec_bridge_;
+
+  // Object to calculate the current audio timestamp for A/V sync.
+  scoped_ptr<AudioTimestampHelper> audio_timestamp_helper_;
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_ANDROID_AUDIO_DECODER_JOB_H_