text: /*
   * Copyright (C) 2012 The Android Open Source Project
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  // Implementation of AudioBufferProvider that wraps an NBAIO_Source
  
  #ifndef ANDROID_SOURCE_AUDIO_BUFFER_PROVIDER_H
  #define ANDROID_SOURCE_AUDIO_BUFFER_PROVIDER_H
  
  #include "NBAIO.h"
  #include <media/ExtendedAudioBufferProvider.h>
  
  namespace android {
  
  class SourceAudioBufferProvider : public ExtendedAudioBufferProvider {
  
  public:
      SourceAudioBufferProvider(const sp<NBAIO_Source>& source);
      virtual ~SourceAudioBufferProvider();
  
      // AudioBufferProvider interface
      virtual status_t getNextBuffer(Buffer *buffer, int64_t pts);
      virtual void     releaseBuffer(Buffer *buffer);
  
      // ExtendedAudioBufferProvider interface
      virtual size_t   framesReady() const;
      virtual size_t   framesReleased() const;
      virtual void     onTimestamp(const AudioTimestamp& timestamp);
  
  private:
      const sp<NBAIO_Source> mSource;     // the wrapped source
      /*const*/ size_t    mFrameBitShift; // log2(frame size in bytes)
      void*               mAllocated; // pointer to base of allocated memory
      size_t              mSize;      // size of mAllocated in frames
      size_t              mOffset;    // frame offset within mAllocated of valid data
      size_t              mRemaining; // frame count within mAllocated of valid data
      size_t              mGetCount;  // buffer.frameCount of the most recent getNextBuffer
      uint32_t            mFramesReleased;    // counter of the total number of frames released
  };
  
  }   // namespace android
  
  #endif  // ANDROID_SOURCE_AUDIO_BUFFER_PROVIDER_H
  