gecko-dev/dom/media/AbstractMediaDecoder.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et cindent: */
/* 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 AbstractMediaDecoder_h_
#define AbstractMediaDecoder_h_
#include "mozilla/Attributes.h"
#include "MediaInfo.h"
#include "nsISupports.h"
#include "nsDataHashtable.h"
#include "nsThreadUtils.h"
namespace mozilla
{
namespace layers
{
class ImageContainer;
}
class MediaResource;
class ReentrantMonitor;
class VideoFrameContainer;
class TimedMetadata;
class MediaDecoderOwner;
#ifdef MOZ_EME
class CDMProxy;
#endif
typedef nsDataHashtable<nsCStringHashKey, nsCString> MetadataTags;
static inline bool IsCurrentThread(nsIThread* aThread) {
return NS_GetCurrentThread() == aThread;
}
/**
* The AbstractMediaDecoder class describes the public interface for a media decoder
* and is used by the MediaReader classes.
*/
class AbstractMediaDecoder : public nsISupports
{
public:
// Returns the monitor for other threads to synchronise access to
// state.
virtual ReentrantMonitor& GetReentrantMonitor() = 0;
// Returns true if the decoder is shut down.
virtual bool IsShutdown() const = 0;
virtual bool OnStateMachineThread() const = 0;
virtual bool OnDecodeThread() const = 0;
// Get the current MediaResource being used. Its URI will be returned
// by currentSrc. Returns what was passed to Load(), if Load() has been called.
virtual MediaResource* GetResource() const = 0;
// Called by the decode thread to keep track of the number of bytes read
// from the resource.
virtual void NotifyBytesConsumed(int64_t aBytes, int64_t aOffset) = 0;
// Increments the parsed and decoded frame counters by the passed in counts.
// Can be called on any thread.
virtual void NotifyDecodedFrames(uint32_t aParsed, uint32_t aDecoded) = 0;
// Return the duration of the media in microseconds.
virtual int64_t GetMediaDuration() = 0;
// Set the duration of the media in microseconds.
virtual void SetMediaDuration(int64_t aDuration) = 0;
// Sets the duration of the media in microseconds. The MediaDecoder
// fires a durationchange event to its owner (e.g., an HTML audio
// tag).
virtual void UpdateEstimatedMediaDuration(int64_t aDuration) = 0;
// Set the media as being seekable or not.
virtual void SetMediaSeekable(bool aMediaSeekable) = 0;
virtual VideoFrameContainer* GetVideoFrameContainer() = 0;
virtual mozilla::layers::ImageContainer* GetImageContainer() = 0;
// Return true if the media layer supports seeking.
virtual bool IsTransportSeekable() = 0;
// Return true if the transport layer supports seeking.
virtual bool IsMediaSeekable() = 0;
virtual void MetadataLoaded(nsAutoPtr<MediaInfo> aInfo, nsAutoPtr<MetadataTags> aTags) = 0;
virtual void QueueMetadata(int64_t aTime, nsAutoPtr<MediaInfo> aInfo, nsAutoPtr<MetadataTags> aTags) = 0;
virtual void FirstFrameLoaded(nsAutoPtr<MediaInfo> aInfo) = 0;
virtual void RemoveMediaTracks() = 0;
// Set the media end time in microseconds
virtual void SetMediaEndTime(int64_t aTime) = 0;
// Make the decoder state machine update the playback position. Called by
// the reader on the decoder thread (Assertions for this checked by
// mDecoderStateMachine). This must be called with the decode monitor
// held.
virtual void UpdatePlaybackPosition(int64_t aTime) = 0;
// May be called by the reader to notify this decoder that the metadata from
// the media file has been read. Call on the decode thread only.
virtual void OnReadMetadataCompleted() = 0;
// Returns the owner of this media decoder. The owner should only be used
// on the main thread.
virtual MediaDecoderOwner* GetOwner() = 0;
// May be called by the reader to notify the decoder that the resources
// required to begin playback have been acquired. Can be called on any thread.
virtual void NotifyWaitingForResourcesStatusChanged() = 0;
// Called by the reader's MediaResource as data arrives over the network.
// Must be called on the main thread.
virtual void NotifyDataArrived(const char* aBuffer, uint32_t aLength, int64_t aOffset) = 0;
// Set by Reader if the current audio track can be offloaded
virtual void SetPlatformCanOffloadAudio(bool aCanOffloadAudio) {}
// Called by Decoder/State machine to check audio offload condtions are met
virtual bool CheckDecoderCanOffloadAudio() { return false; }
// Called from HTMLMediaElement when owner document activity changes
virtual void SetElementVisibility(bool aIsVisible) {}
// Called by some MediaDecoderReader to determine if we can rely
// on the resource length to limit reads.
virtual bool HasInitializationData() { return false; }
// Stack based class to assist in notifying the frame statistics of
// parsed and decoded frames. Use inside video demux & decode functions
// to ensure all parsed and decoded frames are reported on all return paths.
class AutoNotifyDecoded {
public:
AutoNotifyDecoded(AbstractMediaDecoder* aDecoder, uint32_t& aParsed, uint32_t& aDecoded)
: mDecoder(aDecoder), mParsed(aParsed), mDecoded(aDecoded) {}
~AutoNotifyDecoded() {
mDecoder->NotifyDecodedFrames(mParsed, mDecoded);
}
private:
AbstractMediaDecoder* mDecoder;
uint32_t& mParsed;
uint32_t& mDecoded;
};
#ifdef MOZ_EME
virtual nsresult SetCDMProxy(CDMProxy* aProxy) { return NS_ERROR_NOT_IMPLEMENTED; }
virtual CDMProxy* GetCDMProxy() { return nullptr; }
#endif
};
class MetadataContainer
{
protected:
MetadataContainer(AbstractMediaDecoder* aDecoder,
nsAutoPtr<MediaInfo> aInfo,
nsAutoPtr<MetadataTags> aTags)
: mDecoder(aDecoder),
mInfo(aInfo),
mTags(aTags)
{}
nsRefPtr<AbstractMediaDecoder> mDecoder;
nsAutoPtr<MediaInfo> mInfo;
nsAutoPtr<MetadataTags> mTags;
};
class MetadataEventRunner : public nsRunnable, private MetadataContainer
{
public:
MetadataEventRunner(AbstractMediaDecoder* aDecoder,
nsAutoPtr<MediaInfo> aInfo,
nsAutoPtr<MetadataTags> aTags)
: MetadataContainer(aDecoder, aInfo, aTags)
{}
NS_IMETHOD Run() MOZ_OVERRIDE
{
mDecoder->MetadataLoaded(mInfo, mTags);
return NS_OK;
}
};
class FirstFrameLoadedEventRunner : public nsRunnable, private MetadataContainer
{
public:
FirstFrameLoadedEventRunner(AbstractMediaDecoder* aDecoder,
nsAutoPtr<MediaInfo> aInfo)
: MetadataContainer(aDecoder, aInfo, nsAutoPtr<MetadataTags>(nullptr))
{}
NS_IMETHOD Run() MOZ_OVERRIDE
{
mDecoder->FirstFrameLoaded(mInfo);
return NS_OK;
}
};
class MetadataUpdatedEventRunner : public nsRunnable, private MetadataContainer
{
public:
MetadataUpdatedEventRunner(AbstractMediaDecoder* aDecoder,
nsAutoPtr<MediaInfo> aInfo,
nsAutoPtr<MetadataTags> aTags)
: MetadataContainer(aDecoder, aInfo, aTags)
{}
NS_IMETHOD Run() MOZ_OVERRIDE
{
nsAutoPtr<MediaInfo> info(new MediaInfo());
*info = *mInfo;
mDecoder->MetadataLoaded(info, mTags);
mDecoder->FirstFrameLoaded(mInfo);
return NS_OK;
}
};
class RemoveMediaTracksEventRunner : public nsRunnable
{
public:
explicit RemoveMediaTracksEventRunner(AbstractMediaDecoder* aDecoder)
: mDecoder(aDecoder)
{}
NS_IMETHOD Run() MOZ_OVERRIDE
{
MOZ_ASSERT(NS_IsMainThread());
mDecoder->RemoveMediaTracks();
return NS_OK;
}
private:
nsRefPtr<AbstractMediaDecoder> mDecoder;
};
}
#endif