gecko-dev/netwerk/dash/mpd/nsDASHWebMODManager.h

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 et sw=2 tw=80: */
/*
* nsDASHWebMODManager.h
*****************************************************************************
*
* Created on: May 1, 2012
* Based on IsoffMainManager.h by:
* Christopher Mueller <christopher.mueller@itec.uni-klu.ac.at>
* Christian Timmerer <christian.timmerer@itec.uni-klu.ac.at>
* Author:
* Steve Workman <sworkman@mozilla.com>
*
* 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/.
*****************************************************************************/
/* DASH - Dynamic Adaptive Streaming over HTTP.
*
* DASH is an adaptive bitrate streaming technology where a multimedia file is
* partitioned into one or more segments and delivered to a client using HTTP.
*
* (see DASHDecoder.cpp for info on DASH interaction with the media engine).
*
*
* Media Presentation Description (MPD) Manager for WebM On Demand Profile.
* ======================
*
* Implements MPD Manager interface to use Adaptation Algorithm to determine
* which stream to download from WebM On Demand-based MPD.
*
* WebM On Demand describes a static, on demand media presentation using WebM
* encoded media files.
* Notes:
* 1 time |Period| per media presentation |MPD|.
* 1 audio stream (1 |Representation| for the audio |AdaptationSet|).
* 1 or multiple video streams for stream switching:
* (multiple |Representation|s for the video |AdaptationSet|).
* 1 file for each encoding (1 |Segment| per |Representation|).
* Stream switching allowed between clusters (clusters match DASH
* subsegments).
*
* Note: Adaptation algorithm is separate and passed into manager.
* XXX Adaptation not yet implemented.
*/
#ifndef _NSDASHWEBMODMANAGER_H_
#define _NSDASHWEBMODMANAGER_H_
#include "nsTArray.h"
#include "nsIURI.h"
#include "nsString.h"
#include "MPD.h"
#include "Period.h"
#include "AdaptationSet.h"
#include "Representation.h"
#include "IMPDManager.h"
namespace mozilla {
namespace net {
class nsDASHWebMODManager : public IMPDManager
{
public:
nsDASHWebMODManager(MPD* mpd);
~nsDASHWebMODManager();
// See IMPDManager.h for descriptions of following inherited functions.
Period const * GetFirstPeriod() const;
uint32_t GetNumAdaptationSets() const;
AdaptationSetType
GetAdaptationSetType(uint32_t const aAdaptSetIdx) const;
uint32_t GetNumRepresentations(uint32_t const aAdaptSetIdx) const;
Representation const * GetRepresentation(uint32_t const aAdaptSetIdx,
uint32_t const aRepIdx) const;
nsresult GetFirstSegmentUrl(uint32_t const aAdaptSetIdx,
uint32_t const aRepIdx,
nsAString &aUrl) const;
double GetStartTime() const;
double GetDuration() const;
// Gets index of the |Representation| with next highest bitrate to the
// estimated bandwidth passed in. Returns true if there is at least one
// |Representation| with a bitrate lower than |aBandwidth|; otherwise returns
// false. Depends on |mRepresentations| being an ordered list.
bool GetBestRepForBandwidth(uint32_t aAdaptSetIdx,
uint64_t aBandwidth,
uint32_t &aRepIdx) const MOZ_OVERRIDE;
private:
// Internal helper functions.
AdaptationSet const * GetAdaptationSet(uint32_t const aAdaptSetIdx) const;
AdaptationSetType GetAdaptationSetType(nsAString const &mimeType) const;
uint32_t GetNumSegments(Representation const* aRep) const;
// Pointer to the MPD class structure; holds data parsed from the MPD file.
nsAutoPtr<MPD> mMpd;
};
}//namespace net
}//namespace mozilla
#endif /* _NSDASHWEBMODMANAGER_H_ */