gecko-dev/content/media/mediasource/SourceBufferResource.h

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef MOZILLA_SOURCEBUFFERRESOURCE_H_
#define MOZILLA_SOURCEBUFFERRESOURCE_H_

#include "MediaCache.h"
#include "MediaResource.h"
#include "mozilla/Attributes.h"
#include "mozilla/ReentrantMonitor.h"
#include "nsCOMPtr.h"
#include "nsError.h"
#include "nsIPrincipal.h"
#include "nsStringGlue.h"
#include "nsTArray.h"
#include "nscore.h"

class nsIStreamListener;

namespace mozilla {

class MediaDecoder;

namespace dom {

class SourceBuffer;

}  // namespace dom

class SourceBufferResource MOZ_FINAL : public MediaResource
{
public:
  SourceBufferResource(nsIPrincipal* aPrincipal,
                       const nsACString& aType);
  ~SourceBufferResource();

  virtual nsresult Close() MOZ_OVERRIDE;
  virtual void Suspend(bool aCloseImmediately) MOZ_OVERRIDE {}
  virtual void Resume() MOZ_OVERRIDE {}

  virtual already_AddRefed<nsIPrincipal> GetCurrentPrincipal() MOZ_OVERRIDE
  {
    return nsCOMPtr<nsIPrincipal>(mPrincipal).forget();
  }

  virtual already_AddRefed<MediaResource> CloneData(MediaDecoder* aDecoder) MOZ_OVERRIDE
  {
    return nullptr;
  }

  virtual void SetReadMode(MediaCacheStream::ReadMode aMode) MOZ_OVERRIDE {}
  virtual void SetPlaybackRate(uint32_t aBytesPerSecond) MOZ_OVERRIDE {}
  virtual nsresult Read(char* aBuffer, uint32_t aCount, uint32_t* aBytes) MOZ_OVERRIDE;
  virtual nsresult ReadAt(int64_t aOffset, char* aBuffer, uint32_t aCount, uint32_t* aBytes) MOZ_OVERRIDE;
  virtual nsresult Seek(int32_t aWhence, int64_t aOffset) MOZ_OVERRIDE;
  virtual void StartSeekingForMetadata() MOZ_OVERRIDE { }
  virtual void EndSeekingForMetadata() MOZ_OVERRIDE {}
  virtual int64_t Tell() MOZ_OVERRIDE { return mOffset; }
  virtual void Pin() MOZ_OVERRIDE {}
  virtual void Unpin() MOZ_OVERRIDE {}
  virtual double GetDownloadRate(bool* aIsReliable) MOZ_OVERRIDE { return 0; }
  virtual int64_t GetLength() MOZ_OVERRIDE { return mInputBuffer.Length(); }
  virtual int64_t GetNextCachedData(int64_t aOffset) MOZ_OVERRIDE { return aOffset; }
  virtual int64_t GetCachedDataEnd(int64_t aOffset) MOZ_OVERRIDE { return GetLength(); }
  virtual bool IsDataCachedToEndOfResource(int64_t aOffset) MOZ_OVERRIDE { return true; }
  virtual bool IsSuspendedByCache() MOZ_OVERRIDE { return false; }
  virtual bool IsSuspended() MOZ_OVERRIDE { return false; }
  virtual nsresult ReadFromCache(char* aBuffer, int64_t aOffset, uint32_t aCount) MOZ_OVERRIDE;
  virtual bool IsTransportSeekable() MOZ_OVERRIDE { return true; }
  virtual nsresult Open(nsIStreamListener** aStreamListener) MOZ_OVERRIDE { return NS_ERROR_FAILURE; }

  virtual nsresult GetCachedRanges(nsTArray<MediaByteRange>& aRanges) MOZ_OVERRIDE
  {
    aRanges.AppendElement(MediaByteRange(0, GetLength()));
    return NS_OK;
  }

  virtual const nsCString& GetContentType() const MOZ_OVERRIDE { return mType; }

  // Used by SourceBuffer.
  void AppendData(const uint8_t* aData, uint32_t aLength);
  void Ended();

private:
  nsCOMPtr<nsIPrincipal> mPrincipal;
  const nsAutoCString mType;

  // Provides synchronization between SourceBuffers and InputAdapters.
  // Protects all of the member variables below.  Read() will await a
  // Notify() (from Seek, AppendData, Ended, or Close) when insufficient
  // data is available in mData.
  ReentrantMonitor mMonitor;
  nsTArray<uint8_t> mInputBuffer;

  int64_t mOffset;
  bool mClosed;
  bool mEnded;
};

} // namespace mozilla
#endif /* MOZILLA_SOURCEBUFFERRESOURCE_H_ */