[PPAPI] Pepper MediaStream API audio track implementation and example.

ppapi/cpp/audio_frame.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 PPAPI_CPP_AUDIO_FRAME_H_
 #define PPAPI_CPP_AUDIO_FRAME_H_
 
 #include "ppapi/c/ppb_audio_frame.h"
 #include "ppapi/cpp/resource.h"
 
@@ skipping 29 matching lines @@
   /// frame. Given in seconds since the start of the containing audio stream.
   PP_TimeDelta GetTimestamp() const;
 
   /// Sets the timestamp of the audio frame.
   ///
   /// @param[in] timestamp A <code>PP_TimeDelta</code> containing the timestamp
   /// of the audio frame. Given in seconds since the start of the containing
   /// audio stream.
   void SetTimestamp(PP_TimeDelta timestamp);
 
+  /// Gets the sample rate of the audio frame.
+  ///
+  /// @return The sample rate of the audio frame.
+  PP_AudioFrame_SampleRate GetSampleRate() const;
+
   /// Gets the sample size of the audio frame in bytes.
   ///
   /// @return The sample size of the audio frame in bytes.
-  uint32_t GetSampleSize() const;
+  PP_AudioFrame_SampleSize GetSampleSize() const;
 
   /// Gets the number of channels in the audio frame.
   ///
   /// @return The number of channels in the audio frame.
   uint32_t GetNumberOfChannels() const;
 
   /// Gets the number of samples in the audio frame.
   ///
   /// @return The number of samples in the audio frame.
   /// For example, at a sampling rate of 44,100 Hz in stereo audio, a frame
   /// containing 4,410 * 2 samples would have a duration of 100 milliseconds.
   uint32_t GetNumberOfSamples() const;
 
   /// Gets the data buffer containing the audio frame samples.
   ///
   /// @return A pointer to the beginning of the data buffer.
   void* GetDataBuffer();
 
   /// Gets the size of data buffer in bytes.
   ///
   /// @return The size of the data buffer in bytes.
   uint32_t GetDataBufferSize() const;
 };
 
 }  // namespace pp
 
 #endif  // PPAPI_CPP_AUDIO_FRAME_H_