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342 lines
14 KiB
C++
342 lines
14 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#if !defined(MediaDecoderReader_h_)
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#define MediaDecoderReader_h_
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#include "AbstractMediaDecoder.h"
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#include "MediaInfo.h"
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#include "MediaData.h"
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#include "MediaPromise.h"
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#include "MediaQueue.h"
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#include "AudioCompactor.h"
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namespace mozilla {
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namespace dom {
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class TimeRanges;
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}
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class MediaDecoderReader;
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class SharedDecoderManager;
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struct WaitForDataRejectValue {
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enum Reason {
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SHUTDOWN,
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CANCELED
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};
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WaitForDataRejectValue(MediaData::Type aType, Reason aReason)
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:mType(aType), mReason(aReason) {}
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MediaData::Type mType;
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Reason mReason;
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};
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// Encapsulates the decoding and reading of media data. Reading can either
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// synchronous and done on the calling "decode" thread, or asynchronous and
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// performed on a background thread, with the result being returned by
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// callback. Never hold the decoder monitor when calling into this class.
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// Unless otherwise specified, methods and fields of this class can only
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// be accessed on the decode task queue.
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class MediaDecoderReader {
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public:
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enum NotDecodedReason {
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END_OF_STREAM,
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DECODE_ERROR,
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WAITING_FOR_DATA,
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CANCELED
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};
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typedef MediaPromise<nsRefPtr<AudioData>, NotDecodedReason, /* IsExclusive = */ true> AudioDataPromise;
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typedef MediaPromise<nsRefPtr<VideoData>, NotDecodedReason, /* IsExclusive = */ true> VideoDataPromise;
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typedef MediaPromise<int64_t, nsresult, /* IsExclusive = */ true> SeekPromise;
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// Note that, conceptually, WaitForData makes sense in a non-exclusive sense.
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// But in the current architecture it's only ever used exclusively (by MDSM),
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// so we mark it that way to verify our assumptions. If you have a use-case
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// for multiple WaitForData consumers, feel free to flip the exclusivity here.
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typedef MediaPromise<MediaData::Type, WaitForDataRejectValue, /* IsExclusive = */ true> WaitForDataPromise;
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NS_INLINE_DECL_THREADSAFE_REFCOUNTING(MediaDecoderReader)
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// The caller must ensure that Shutdown() is called before aDecoder is
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// destroyed.
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explicit MediaDecoderReader(AbstractMediaDecoder* aDecoder);
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// Initializes the reader, returns NS_OK on success, or NS_ERROR_FAILURE
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// on failure.
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virtual nsresult Init(MediaDecoderReader* aCloneDonor) = 0;
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// True if this reader is waiting media resource allocation
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virtual bool IsWaitingMediaResources() { return false; }
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// True if this reader is waiting for a Content Decryption Module to become
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// available.
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virtual bool IsWaitingOnCDMResource() { return false; }
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// True when this reader need to become dormant state
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virtual bool IsDormantNeeded() { return false; }
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// Release media resources they should be released in dormant state
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// The reader can be made usable again by calling ReadMetadata().
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virtual void ReleaseMediaResources() {};
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virtual void SetSharedDecoderManager(SharedDecoderManager* aManager) {}
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// Breaks reference-counted cycles. Called during shutdown.
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// WARNING: If you override this, you must call the base implementation
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// in your override.
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virtual void BreakCycles();
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// Destroys the decoding state. The reader cannot be made usable again.
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// This is different from ReleaseMediaResources() as it is irreversable,
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// whereas ReleaseMediaResources() is. Must be called on the decode
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// thread.
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virtual nsRefPtr<ShutdownPromise> Shutdown();
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MediaTaskQueue* EnsureTaskQueue();
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virtual bool OnDecodeThread()
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{
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return !GetTaskQueue() || GetTaskQueue()->IsCurrentThreadIn();
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}
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void SetBorrowedTaskQueue(MediaTaskQueue* aTaskQueue)
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{
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MOZ_ASSERT(!mTaskQueue && aTaskQueue);
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mTaskQueue = aTaskQueue;
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mTaskQueueIsBorrowed = true;
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}
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// Resets all state related to decoding, emptying all buffers etc.
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// Cancels all pending Request*Data() request callbacks, and flushes the
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// decode pipeline. The decoder must not call any of the callbacks for
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// outstanding Request*Data() calls after this is called. Calls to
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// Request*Data() made after this should be processed as usual.
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// Normally this call preceedes a Seek() call, or shutdown.
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// The first samples of every stream produced after a ResetDecode() call
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// *must* be marked as "discontinuities". If it's not, seeking work won't
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// properly!
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virtual nsresult ResetDecode();
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// Requests one audio sample from the reader.
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//
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// The decode should be performed asynchronously, and the promise should
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// be resolved when it is complete. Don't hold the decoder
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// monitor while calling this, as the implementation may try to wait
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// on something that needs the monitor and deadlock.
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virtual nsRefPtr<AudioDataPromise> RequestAudioData();
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// Requests one video sample from the reader.
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//
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// Don't hold the decoder monitor while calling this, as the implementation
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// may try to wait on something that needs the monitor and deadlock.
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// If aSkipToKeyframe is true, the decode should skip ahead to the
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// the next keyframe at or after aTimeThreshold microseconds.
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virtual nsRefPtr<VideoDataPromise>
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RequestVideoData(bool aSkipToNextKeyframe, int64_t aTimeThreshold);
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friend class ReRequestVideoWithSkipTask;
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friend class ReRequestAudioTask;
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// By default, the state machine polls the reader once per second when it's
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// in buffering mode. Some readers support a promise-based mechanism by which
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// they notify the state machine when the data arrives.
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virtual bool IsWaitForDataSupported() { return false; }
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virtual nsRefPtr<WaitForDataPromise> WaitForData(MediaData::Type aType) { MOZ_CRASH(); }
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virtual bool HasAudio() = 0;
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virtual bool HasVideo() = 0;
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// A function that is called before ReadMetadata() call.
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virtual void PreReadMetadata() {};
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// Read header data for all bitstreams in the file. Fills aInfo with
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// the data required to present the media, and optionally fills *aTags
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// with tag metadata from the file.
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// Returns NS_OK on success, or NS_ERROR_FAILURE on failure.
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virtual nsresult ReadMetadata(MediaInfo* aInfo,
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MetadataTags** aTags) = 0;
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// Fills aInfo with the latest cached data required to present the media,
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// ReadUpdatedMetadata will always be called once ReadMetadata has succeeded.
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virtual void ReadUpdatedMetadata(MediaInfo* aInfo) { };
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// Moves the decode head to aTime microseconds. aEndTime denotes the end
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// time of the media in usecs. This is only needed for OggReader, and should
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// probably be removed somehow.
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virtual nsRefPtr<SeekPromise>
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Seek(int64_t aTime, int64_t aEndTime) = 0;
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// Cancels an ongoing seek, if any. Any previously-requested seek is
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// guaranteeed to be resolved or rejected in finite time, though no
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// guarantees are made about precise nature of the resolve/reject, since the
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// promise might have already dispatched a resolution or an error code before
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// the cancel arrived.
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//
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// Must be called on the decode task queue.
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virtual void CancelSeek() { };
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// Called to move the reader into idle state. When the reader is
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// created it is assumed to be active (i.e. not idle). When the media
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// element is paused and we don't need to decode any more data, the state
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// machine calls SetIdle() to inform the reader that its decoder won't be
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// needed for a while. The reader can use these notifications to enter
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// a low power state when the decoder isn't needed, if desired.
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// This is most useful on mobile.
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// Note: DecodeVideoFrame, DecodeAudioData, ReadMetadata and Seek should
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// activate the decoder if necessary. The state machine only needs to know
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// when to call SetIdle().
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virtual void SetIdle() { }
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// Tell the reader that the data decoded are not for direct playback, so it
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// can accept more files, in particular those which have more channels than
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// available in the audio output.
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void SetIgnoreAudioOutputFormat()
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{
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mIgnoreAudioOutputFormat = true;
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}
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// Populates aBuffered with the time ranges which are buffered. This function
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// is called on the main, decode, and state machine threads.
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//
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// This base implementation in MediaDecoderReader estimates the time ranges
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// buffered by interpolating the cached byte ranges with the duration
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// of the media. Reader subclasses should override this method if they
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// can quickly calculate the buffered ranges more accurately.
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//
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// The primary advantage of this implementation in the reader base class
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// is that it's a fast approximation, which does not perform any I/O.
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//
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// The OggReader relies on this base implementation not performing I/O,
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// since in FirefoxOS we can't do I/O on the main thread, where this is
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// called.
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virtual nsresult GetBuffered(dom::TimeRanges* aBuffered);
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virtual int64_t ComputeStartTime(const VideoData* aVideo, const AudioData* aAudio);
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// The MediaDecoderStateMachine uses various heuristics that assume that
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// raw media data is arriving sequentially from a network channel. This
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// makes sense in the <video src="foo"> case, but not for more advanced use
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// cases like MSE.
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virtual bool UseBufferingHeuristics() { return true; }
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// Returns the number of bytes of memory allocated by structures/frames in
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// the video queue.
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size_t SizeOfVideoQueueInBytes() const;
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// Returns the number of bytes of memory allocated by structures/frames in
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// the audio queue.
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size_t SizeOfAudioQueueInBytes() const;
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virtual size_t SizeOfVideoQueueInFrames();
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virtual size_t SizeOfAudioQueueInFrames();
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// Only used by WebMReader and MediaOmxReader for now, so stub here rather
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// than in every reader than inherits from MediaDecoderReader.
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virtual void NotifyDataArrived(const char* aBuffer, uint32_t aLength, int64_t aOffset) {}
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virtual int64_t GetEvictionOffset(double aTime) { return -1; }
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virtual MediaQueue<AudioData>& AudioQueue() { return mAudioQueue; }
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virtual MediaQueue<VideoData>& VideoQueue() { return mVideoQueue; }
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// Returns a pointer to the decoder.
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AbstractMediaDecoder* GetDecoder() {
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return mDecoder;
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}
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// TODO: DEPRECATED. This uses synchronous decoding.
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VideoData* DecodeToFirstVideoData();
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MediaInfo GetMediaInfo() { return mInfo; }
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// Indicates if the media is seekable.
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// ReadMetada should be called before calling this method.
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virtual bool IsMediaSeekable() = 0;
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void SetStartTime(int64_t aStartTime);
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MediaTaskQueue* GetTaskQueue() {
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return mTaskQueue;
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}
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// Returns true if the reader implements RequestAudioData()
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// and RequestVideoData() asynchronously, rather than using the
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// implementation in this class to adapt the old synchronous to
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// the newer async model.
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virtual bool IsAsync() const { return false; }
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protected:
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virtual ~MediaDecoderReader();
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// Overrides of this function should decodes an unspecified amount of
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// audio data, enqueuing the audio data in mAudioQueue. Returns true
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// when there's more audio to decode, false if the audio is finished,
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// end of file has been reached, or an un-recoverable read error has
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// occured. This function blocks until the decode is complete.
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virtual bool DecodeAudioData() {
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return false;
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}
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// Overrides of this function should read and decodes one video frame.
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// Packets with a timestamp less than aTimeThreshold will be decoded
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// (unless they're not keyframes and aKeyframeSkip is true), but will
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// not be added to the queue. This function blocks until the decode
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// is complete.
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virtual bool DecodeVideoFrame(bool &aKeyframeSkip, int64_t aTimeThreshold) {
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return false;
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}
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// Queue of audio frames. This queue is threadsafe, and is accessed from
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// the audio, decoder, state machine, and main threads.
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MediaQueue<AudioData> mAudioQueue;
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// Queue of video frames. This queue is threadsafe, and is accessed from
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// the decoder, state machine, and main threads.
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MediaQueue<VideoData> mVideoQueue;
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// An adapter to the audio queue which first copies data to buffers with
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// minimal allocation slop and then pushes them to the queue. This is
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// useful for decoders working with formats that give awkward numbers of
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// frames such as mp3.
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AudioCompactor mAudioCompactor;
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// Reference to the owning decoder object.
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AbstractMediaDecoder* mDecoder;
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// Stores presentation info required for playback.
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MediaInfo mInfo;
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// Whether we should accept media that we know we can't play
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// directly, because they have a number of channel higher than
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// what we support.
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bool mIgnoreAudioOutputFormat;
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// The start time of the media, in microseconds. This is the presentation
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// time of the first frame decoded from the media. This is initialized to -1,
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// and then set to a value >= by MediaDecoderStateMachine::SetStartTime(),
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// after which point it never changes.
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int64_t mStartTime;
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// This is a quick-and-dirty way for DecodeAudioData implementations to
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// communicate the presence of a decoding error to RequestAudioData. We should
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// replace this with a promise-y mechanism as we make this stuff properly
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// async.
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bool mHitAudioDecodeError;
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bool mShutdown;
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private:
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// Promises used only for the base-class (sync->async adapter) implementation
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// of Request{Audio,Video}Data.
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MediaPromiseHolder<AudioDataPromise> mBaseAudioPromise;
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MediaPromiseHolder<VideoDataPromise> mBaseVideoPromise;
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nsRefPtr<MediaTaskQueue> mTaskQueue;
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bool mTaskQueueIsBorrowed;
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// Flags whether a the next audio/video sample comes after a "gap" or
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// "discontinuity" in the stream. For example after a seek.
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bool mAudioDiscontinuity;
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bool mVideoDiscontinuity;
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};
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} // namespace mozilla
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#endif
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