/* -*- 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_MEDIASOURCEDECODER_H_
#define MOZILLA_MEDIASOURCEDECODER_H_

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

class nsIPrincipal;
class nsIStreamListener;

namespace mozilla {

class MediaDecoderReader;
class MediaDecoderStateMachine;
class SubBufferDecoder;

namespace dom {

class HTMLMediaElement;
class MediaSource;

} // namespace dom

class MediaSourceDecoder : public MediaDecoder
{
public:
  MediaSourceDecoder(dom::HTMLMediaElement* aElement);

  virtual MediaDecoder* Clone() MOZ_OVERRIDE;
  virtual MediaDecoderStateMachine* CreateStateMachine() MOZ_OVERRIDE;
  virtual nsresult Load(nsIStreamListener**, MediaDecoder*) MOZ_OVERRIDE;
  virtual nsresult GetSeekable(dom::TimeRanges* aSeekable) MOZ_OVERRIDE;

  void AttachMediaSource(dom::MediaSource* aMediaSource);
  void DetachMediaSource();

  SubBufferDecoder* CreateSubDecoder(const nsACString& aType);

  const nsTArray<MediaDecoderReader*>& GetReaders()
  {
    ReentrantMonitorAutoEnter mon(GetReentrantMonitor());
    while (mReaders.Length() == 0) {
      mon.Wait();
    }
    return mReaders;
  }

  void SetVideoReader(MediaDecoderReader* aReader)
  {
    MOZ_ASSERT(aReader && !mVideoReader);
    mVideoReader = aReader;
  }

  void SetAudioReader(MediaDecoderReader* aReader)
  {
    MOZ_ASSERT(aReader && !mAudioReader);
    mAudioReader = aReader;
  }

  MediaDecoderReader* GetVideoReader()
  {
    return mVideoReader;
  }

  MediaDecoderReader* GetAudioReader()
  {
    return mAudioReader;
  }

  // Returns the duration in seconds as provided by the attached MediaSource.
  // If no MediaSource is attached, returns the duration tracked by the decoder.
  double GetMediaSourceDuration();

private:
  dom::MediaSource* mMediaSource;

  nsTArray<nsRefPtr<SubBufferDecoder> > mDecoders;
  nsTArray<MediaDecoderReader*> mReaders; // Readers owned by Decoders.

  MediaDecoderReader* mVideoReader;
  MediaDecoderReader* mAudioReader;
};

class MediaSourceResource MOZ_FINAL : public MediaResource
{
public:
  MediaSourceResource() {}

  virtual nsresult Close() MOZ_OVERRIDE { return NS_OK; }
  virtual void Suspend(bool aCloseImmediately) MOZ_OVERRIDE {}
  virtual void Resume() MOZ_OVERRIDE {}
  virtual already_AddRefed<nsIPrincipal> GetCurrentPrincipal() MOZ_OVERRIDE { return nullptr; }
  virtual bool CanClone() MOZ_OVERRIDE { return false; }
  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 { return NS_ERROR_FAILURE; }
  virtual nsresult ReadAt(int64_t aOffset, char* aBuffer, uint32_t aCount, uint32_t* aBytes) MOZ_OVERRIDE { return NS_ERROR_FAILURE; }
  virtual nsresult Seek(int32_t aWhence, int64_t aOffset) MOZ_OVERRIDE { return NS_ERROR_FAILURE; }
  virtual void StartSeekingForMetadata() MOZ_OVERRIDE {}
  virtual void EndSeekingForMetadata() MOZ_OVERRIDE {}
  virtual int64_t Tell() MOZ_OVERRIDE { return -1; }
  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 -1; }
  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 { return NS_ERROR_FAILURE; }
  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 bool IsTransportSeekable() MOZ_OVERRIDE { return true; }
  virtual const nsCString& GetContentType() const MOZ_OVERRIDE { return mType; }

private:
  const nsAutoCString mType;
};

} // namespace mozilla

#endif /* MOZILLA_MEDIASOURCEDECODER_H_ */
