gecko-dev/content/media/AbstractMediaDecoder.h

164 строки
5.3 KiB
C++

/* -*- 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 "nsISupports.h"
#include "nsDataHashtable.h"
#include "nsThreadUtils.h"
namespace mozilla
{
namespace layers
{
class ImageContainer;
}
class MediaResource;
class ReentrantMonitor;
class VideoFrameContainer;
class TimedMetadata;
class MediaDecoderOwner;
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;
// Returns the end time of the last sample in the media. Note that a media
// can have a non-zero start time, so the end time may not necessarily be
// the same as the duration (i.e. duration is (end_time - start_time)).
virtual int64_t GetEndMediaTime() const = 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;
// Set the transport level as being seekable or not.
virtual void SetTransportSeekable(bool aTransportSeekable) = 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(int aChannels, int aRate, bool aHasAudio, bool aHasVideo, MetadataTags* aTags) = 0;
virtual void QueueMetadata(int64_t aTime, int aChannels, int aRate, bool aHasAudio, bool aHasVideo, MetadataTags* aTags) = 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;
// 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;
};
};
class AudioMetadataEventRunner : public nsRunnable
{
private:
nsRefPtr<AbstractMediaDecoder> mDecoder;
public:
AudioMetadataEventRunner(AbstractMediaDecoder* aDecoder, int aChannels, int aRate, bool aHasAudio, bool aHasVideo, MetadataTags* aTags)
: mDecoder(aDecoder),
mChannels(aChannels),
mRate(aRate),
mHasAudio(aHasAudio),
mHasVideo(aHasVideo),
mTags(aTags)
{}
NS_IMETHOD Run() MOZ_OVERRIDE
{
mDecoder->MetadataLoaded(mChannels, mRate, mHasAudio, mHasVideo, mTags);
return NS_OK;
}
int mChannels;
int mRate;
bool mHasAudio;
bool mHasVideo;
MetadataTags* mTags;
};
}
#endif