mirror of
https://github.com/mozilla/gecko-dev.git
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574 lines
17 KiB
C++
574 lines
17 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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#include "MediaSourceResource.h"
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#include "MediaSourceDecoder.h"
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#include "AbstractMediaDecoder.h"
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#include "MediaDecoderReader.h"
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#include "MediaDecoderStateMachine.h"
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#include "mozilla/Assertions.h"
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#include "mozilla/FloatingPoint.h"
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#include "mozilla/dom/HTMLMediaElement.h"
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#include "mozilla/dom/TimeRanges.h"
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#include "mozilla/mozalloc.h"
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#include "nsAutoPtr.h"
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#include "nsISupports.h"
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#include "nsIThread.h"
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#include "prlog.h"
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#include "MediaSource.h"
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#include "SubBufferDecoder.h"
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#include "SourceBufferResource.h"
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#include "SourceBufferList.h"
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#include "VideoUtils.h"
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#ifdef PR_LOGGING
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extern PRLogModuleInfo* gMediaSourceLog;
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#define MSE_DEBUG(...) PR_LOG(gMediaSourceLog, PR_LOG_DEBUG, (__VA_ARGS__))
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#else
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#define MSE_DEBUG(...)
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#endif
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namespace mozilla {
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namespace dom {
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class TimeRanges;
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} // namespace dom
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class MediaSourceReader : public MediaDecoderReader
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{
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public:
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MediaSourceReader(MediaSourceDecoder* aDecoder, dom::MediaSource* aSource)
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: MediaDecoderReader(aDecoder)
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, mTimeThreshold(-1)
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, mDropVideoBeforeThreshold(false)
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, mActiveVideoDecoder(-1)
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, mActiveAudioDecoder(-1)
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, mMediaSource(aSource)
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{
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}
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nsresult Init(MediaDecoderReader* aCloneDonor) MOZ_OVERRIDE
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{
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// Although we technically don't implement anything here, we return NS_OK
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// so that when the state machine initializes and calls this function
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// we don't return an error code back to the media element.
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return NS_OK;
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}
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bool IsWaitingMediaResources() MOZ_OVERRIDE
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{
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return mDecoders.IsEmpty() && mPendingDecoders.IsEmpty();
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}
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void RequestAudioData() MOZ_OVERRIDE
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{
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if (!GetAudioReader()) {
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MSE_DEBUG("%p DecodeAudioFrame called with no audio reader", this);
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MOZ_ASSERT(mPendingDecoders.IsEmpty());
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GetCallback()->OnDecodeError();
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return;
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}
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GetAudioReader()->RequestAudioData();
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}
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void OnAudioDecoded(AudioData* aSample)
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{
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GetCallback()->OnAudioDecoded(aSample);
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}
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void OnAudioEOS()
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{
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GetCallback()->OnAudioEOS();
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}
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void RequestVideoData(bool aSkipToNextKeyframe, int64_t aTimeThreshold) MOZ_OVERRIDE
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{
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if (!GetVideoReader()) {
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MSE_DEBUG("%p DecodeVideoFrame called with no video reader", this);
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MOZ_ASSERT(mPendingDecoders.IsEmpty());
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GetCallback()->OnDecodeError();
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return;
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}
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mTimeThreshold = aTimeThreshold;
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GetVideoReader()->RequestVideoData(aSkipToNextKeyframe, aTimeThreshold);
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}
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void OnVideoDecoded(VideoData* aSample)
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{
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if (mDropVideoBeforeThreshold) {
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if (aSample->mTime < mTimeThreshold) {
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delete aSample;
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GetVideoReader()->RequestVideoData(false, mTimeThreshold);
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} else {
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mDropVideoBeforeThreshold = false;
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GetCallback()->OnVideoDecoded(aSample);
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}
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} else {
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GetCallback()->OnVideoDecoded(aSample);
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}
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}
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void OnVideoEOS()
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{
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// End of stream. See if we can switch to another video decoder.
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MSE_DEBUG("%p MSR::DecodeVF %d (%p) returned false (readers=%u)",
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this, mActiveVideoDecoder, mDecoders[mActiveVideoDecoder].get(), mDecoders.Length());
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if (MaybeSwitchVideoReaders()) {
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// Success! Resume decoding with next video decoder.
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RequestVideoData(false, mTimeThreshold);
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} else {
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// End of stream.
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MSE_DEBUG("%p MSR::DecodeVF %d (%p) EOS (readers=%u)",
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this, mActiveVideoDecoder, mDecoders[mActiveVideoDecoder].get(), mDecoders.Length());
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GetCallback()->OnVideoEOS();
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}
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}
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void OnDecodeError() {
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GetCallback()->OnDecodeError();
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}
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bool HasVideo() MOZ_OVERRIDE
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{
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return mInfo.HasVideo();
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}
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bool HasAudio() MOZ_OVERRIDE
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{
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return mInfo.HasAudio();
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}
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bool IsMediaSeekable() { return true; }
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nsresult ReadMetadata(MediaInfo* aInfo, MetadataTags** aTags) MOZ_OVERRIDE;
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nsresult Seek(int64_t aTime, int64_t aStartTime, int64_t aEndTime,
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int64_t aCurrentTime) MOZ_OVERRIDE;
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nsresult GetBuffered(dom::TimeRanges* aBuffered, int64_t aStartTime) MOZ_OVERRIDE;
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already_AddRefed<SubBufferDecoder> CreateSubDecoder(const nsACString& aType,
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MediaSourceDecoder* aParentDecoder,
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MediaTaskQueue* aTaskQueue);
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void Shutdown() MOZ_OVERRIDE {
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MediaDecoderReader::Shutdown();
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for (uint32_t i = 0; i < mDecoders.Length(); ++i) {
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mDecoders[i]->GetReader()->Shutdown();
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}
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}
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virtual void BreakCycles() MOZ_OVERRIDE {
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MediaDecoderReader::BreakCycles();
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for (uint32_t i = 0; i < mDecoders.Length(); ++i) {
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mDecoders[i]->GetReader()->BreakCycles();
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}
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}
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void InitializePendingDecoders();
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bool IsShutdown() {
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ReentrantMonitorAutoEnter decoderMon(mDecoder->GetReentrantMonitor());
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return mDecoder->IsShutdown();
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}
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private:
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// These are read and written on the decode task queue threads.
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int64_t mTimeThreshold;
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bool mDropVideoBeforeThreshold;
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enum SwitchState {
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SWITCHSTATE_SEEKING,
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SWITCHSTATE_PLAYING
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};
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bool MaybeSwitchVideoReaders(SwitchState aState = SWITCHSTATE_PLAYING) {
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ReentrantMonitorAutoEnter mon(mDecoder->GetReentrantMonitor());
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MOZ_ASSERT(mActiveVideoDecoder != -1);
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InitializePendingDecoders();
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for (uint32_t i = mActiveVideoDecoder + 1; i < mDecoders.Length(); ++i) {
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SubBufferDecoder* decoder = mDecoders[i];
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if (decoder->IsDiscarded() || !decoder->GetReader()->GetMediaInfo().HasVideo()) {
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continue;
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}
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if (aState == SWITCHSTATE_SEEKING || mTimeThreshold >= mDecoders[i]->GetMediaStartTime()) {
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GetVideoReader()->SetIdle();
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mActiveVideoDecoder = i;
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MSE_DEBUG("%p MSR::DecodeVF switching to %d", this, mActiveVideoDecoder);
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return true;
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}
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}
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return false;
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}
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MediaDecoderReader* GetAudioReader() {
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if (mActiveAudioDecoder == -1) {
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return nullptr;
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}
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return mDecoders[mActiveAudioDecoder]->GetReader();
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}
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MediaDecoderReader* GetVideoReader() {
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if (mActiveVideoDecoder == -1) {
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return nullptr;
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}
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return mDecoders[mActiveVideoDecoder]->GetReader();
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}
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nsTArray<nsRefPtr<SubBufferDecoder>> mPendingDecoders;
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nsTArray<nsRefPtr<SubBufferDecoder>> mDecoders;
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int32_t mActiveVideoDecoder;
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int32_t mActiveAudioDecoder;
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dom::MediaSource* mMediaSource;
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};
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class MediaSourceStateMachine : public MediaDecoderStateMachine
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{
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public:
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MediaSourceStateMachine(MediaDecoder* aDecoder,
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MediaDecoderReader* aReader,
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bool aRealTime = false)
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: MediaDecoderStateMachine(aDecoder, aReader, aRealTime)
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{
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}
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already_AddRefed<SubBufferDecoder> CreateSubDecoder(const nsACString& aType,
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MediaSourceDecoder* aParentDecoder) {
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if (!mReader) {
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return nullptr;
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}
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return static_cast<MediaSourceReader*>(mReader.get())->CreateSubDecoder(aType, aParentDecoder, mDecodeTaskQueue);
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}
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nsresult EnqueueDecoderInitialization() {
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AssertCurrentThreadInMonitor();
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if (!mReader) {
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return NS_ERROR_FAILURE;
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}
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return mDecodeTaskQueue->Dispatch(NS_NewRunnableMethod(this,
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&MediaSourceStateMachine::InitializePendingDecoders));
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}
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private:
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void InitializePendingDecoders() {
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if (!mReader) {
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return;
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}
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static_cast<MediaSourceReader*>(mReader.get())->InitializePendingDecoders();
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}
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};
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MediaSourceDecoder::MediaSourceDecoder(dom::HTMLMediaElement* aElement)
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: mMediaSource(nullptr)
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{
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Init(aElement);
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}
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MediaDecoder*
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MediaSourceDecoder::Clone()
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{
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// TODO: Sort out cloning.
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return nullptr;
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}
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MediaDecoderStateMachine*
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MediaSourceDecoder::CreateStateMachine()
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{
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return new MediaSourceStateMachine(this, new MediaSourceReader(this, mMediaSource));
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}
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nsresult
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MediaSourceDecoder::Load(nsIStreamListener**, MediaDecoder*)
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{
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MOZ_ASSERT(!mDecoderStateMachine);
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mDecoderStateMachine = CreateStateMachine();
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if (!mDecoderStateMachine) {
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NS_WARNING("Failed to create state machine!");
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return NS_ERROR_FAILURE;
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}
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return mDecoderStateMachine->Init(nullptr);
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}
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nsresult
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MediaSourceDecoder::GetSeekable(dom::TimeRanges* aSeekable)
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{
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double duration = mMediaSource->Duration();
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if (IsNaN(duration)) {
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// Return empty range.
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} else if (duration > 0 && mozilla::IsInfinite(duration)) {
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nsRefPtr<dom::TimeRanges> bufferedRanges = new dom::TimeRanges();
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GetBuffered(bufferedRanges);
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aSeekable->Add(bufferedRanges->GetStartTime(), bufferedRanges->GetEndTime());
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} else {
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aSeekable->Add(0, duration);
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}
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return NS_OK;
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}
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/*static*/
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already_AddRefed<MediaResource>
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MediaSourceDecoder::CreateResource()
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{
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return nsRefPtr<MediaResource>(new MediaSourceResource()).forget();
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}
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void
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MediaSourceDecoder::AttachMediaSource(dom::MediaSource* aMediaSource)
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{
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MOZ_ASSERT(!mMediaSource && !mDecoderStateMachine);
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mMediaSource = aMediaSource;
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}
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void
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MediaSourceDecoder::DetachMediaSource()
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{
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mMediaSource = nullptr;
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}
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already_AddRefed<SubBufferDecoder>
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MediaSourceDecoder::CreateSubDecoder(const nsACString& aType)
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{
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if (!mDecoderStateMachine) {
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return nullptr;
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}
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return static_cast<MediaSourceStateMachine*>(mDecoderStateMachine.get())->CreateSubDecoder(aType, this);
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}
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nsresult
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MediaSourceDecoder::EnqueueDecoderInitialization()
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{
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if (!mDecoderStateMachine) {
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return NS_ERROR_FAILURE;
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}
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return static_cast<MediaSourceStateMachine*>(mDecoderStateMachine.get())->EnqueueDecoderInitialization();
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}
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class ReleaseDecodersTask : public nsRunnable {
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public:
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ReleaseDecodersTask(nsTArray<nsRefPtr<SubBufferDecoder>>& aDecoders)
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{
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mDecoders.SwapElements(aDecoders);
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}
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NS_IMETHOD Run() MOZ_OVERRIDE MOZ_FINAL {
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mDecoders.Clear();
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return NS_OK;
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}
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private:
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nsTArray<nsRefPtr<SubBufferDecoder>> mDecoders;
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};
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void
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MediaSourceReader::InitializePendingDecoders()
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{
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ReentrantMonitorAutoEnter mon(mDecoder->GetReentrantMonitor());
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for (uint32_t i = 0; i < mPendingDecoders.Length(); ++i) {
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nsRefPtr<SubBufferDecoder> decoder = mPendingDecoders[i];
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MediaDecoderReader* reader = decoder->GetReader();
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MSE_DEBUG("%p: Initializating subdecoder %p reader %p", this, decoder.get(), reader);
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MediaInfo mi;
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nsAutoPtr<MetadataTags> tags; // TODO: Handle metadata.
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nsresult rv;
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int64_t startTime = 0;
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{
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ReentrantMonitorAutoExit exitMon(mDecoder->GetReentrantMonitor());
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rv = reader->ReadMetadata(&mi, getter_Transfers(tags));
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if (NS_SUCCEEDED(rv)) {
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reader->FindStartTime(startTime);
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}
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}
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reader->SetIdle();
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if (NS_FAILED(rv)) {
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// XXX: Need to signal error back to owning SourceBuffer.
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MSE_DEBUG("%p: Reader %p failed to initialize, rv=%x", this, reader, rv);
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continue;
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}
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decoder->SetMediaStartTime(startTime);
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bool active = false;
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if (mi.HasVideo() || mi.HasAudio()) {
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MSE_DEBUG("%p: Reader %p has video=%d audio=%d startTime=%lld",
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this, reader, mi.HasVideo(), mi.HasAudio(), startTime);
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active = true;
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}
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if (active) {
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mDecoders.AppendElement(decoder);
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} else {
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MSE_DEBUG("%p: Reader %p not activated", this, reader);
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}
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}
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NS_DispatchToMainThread(new ReleaseDecodersTask(mPendingDecoders));
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MOZ_ASSERT(mPendingDecoders.IsEmpty());
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mDecoder->NotifyWaitingForResourcesStatusChanged();
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}
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already_AddRefed<SubBufferDecoder>
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MediaSourceReader::CreateSubDecoder(const nsACString& aType,
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MediaSourceDecoder* aParentDecoder,
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MediaTaskQueue* aTaskQueue)
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{
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// XXX: Why/when is mDecoder null here, since it should be equal to aParentDecoder?!
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nsRefPtr<SubBufferDecoder> decoder =
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new SubBufferDecoder(new SourceBufferResource(nullptr, aType), aParentDecoder);
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nsRefPtr<MediaDecoderReader> reader(DecoderTraits::CreateReader(aType, decoder));
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if (!reader) {
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return nullptr;
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}
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// Set a callback on the subreader that forwards calls to this reader.
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// This reader will then forward them onto the state machine via this
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// reader's callback.
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RefPtr<MediaDataDecodedListener<MediaSourceReader>> callback =
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new MediaDataDecodedListener<MediaSourceReader>(this, aTaskQueue);
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reader->SetCallback(callback);
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reader->SetTaskQueue(aTaskQueue);
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reader->Init(nullptr);
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ReentrantMonitorAutoEnter mon(aParentDecoder->GetReentrantMonitor());
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MSE_DEBUG("Registered subdecoder %p subreader %p", decoder.get(), reader.get());
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decoder->SetReader(reader);
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mPendingDecoders.AppendElement(decoder);
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if (NS_FAILED(static_cast<MediaSourceDecoder*>(mDecoder)->EnqueueDecoderInitialization())) {
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MSE_DEBUG("%p: Failed to enqueue decoder initialization task", this);
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return nullptr;
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}
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mDecoder->NotifyWaitingForResourcesStatusChanged();
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return decoder.forget();
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}
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namespace {
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class ChangeToHaveMetadata : public nsRunnable {
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public:
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ChangeToHaveMetadata(AbstractMediaDecoder* aDecoder) :
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mDecoder(aDecoder)
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{
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}
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NS_IMETHOD Run() MOZ_OVERRIDE MOZ_FINAL {
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auto owner = mDecoder->GetOwner();
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if (owner) {
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owner->UpdateReadyStateForData(MediaDecoderOwner::NEXT_FRAME_WAIT_FOR_MSE_DATA);
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}
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return NS_OK;
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}
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private:
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nsRefPtr<AbstractMediaDecoder> mDecoder;
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};
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}
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nsresult
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MediaSourceReader::Seek(int64_t aTime, int64_t aStartTime, int64_t aEndTime,
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int64_t aCurrentTime)
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{
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double target = static_cast<double>(aTime) / USECS_PER_S;
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if (!mMediaSource->ActiveSourceBuffers()->AllContainsTime(target)) {
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NS_DispatchToMainThread(new ChangeToHaveMetadata(mDecoder));
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}
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// Loop until we have the requested time range in the source buffers.
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// This is a workaround for our lack of async functionality in the
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// MediaDecoderStateMachine. Bug 979104 implements what we need and
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// we'll remove this for an async approach based on that in bug XXXXXXX.
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while (!mMediaSource->ActiveSourceBuffers()->AllContainsTime(target)
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&& !IsShutdown()) {
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mMediaSource->WaitForData();
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MaybeSwitchVideoReaders(SWITCHSTATE_SEEKING);
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}
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if (IsShutdown()) {
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return NS_OK;
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}
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ResetDecode();
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if (GetAudioReader()) {
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nsresult rv = GetAudioReader()->Seek(aTime, aStartTime, aEndTime, aCurrentTime);
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if (NS_FAILED(rv)) {
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return rv;
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}
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}
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if (GetVideoReader()) {
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nsresult rv = GetVideoReader()->Seek(aTime, aStartTime, aEndTime, aCurrentTime);
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if (NS_FAILED(rv)) {
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return rv;
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}
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}
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return NS_OK;
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}
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nsresult
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MediaSourceReader::GetBuffered(dom::TimeRanges* aBuffered, int64_t aStartTime)
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{
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for (uint32_t i = 0; i < mDecoders.Length(); ++i) {
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nsRefPtr<dom::TimeRanges> r = new dom::TimeRanges();
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mDecoders[i]->GetBuffered(r);
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aBuffered->Add(r->GetStartTime(), r->GetEndTime());
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}
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aBuffered->Normalize();
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return NS_OK;
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}
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nsresult
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MediaSourceReader::ReadMetadata(MediaInfo* aInfo, MetadataTags** aTags)
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{
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MSE_DEBUG("%p: MSR::ReadMetadata pending=%u", this, mPendingDecoders.Length());
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InitializePendingDecoders();
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MSE_DEBUG("%p: MSR::ReadMetadata decoders=%u", this, mDecoders.Length());
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|
|
|
// XXX: Make subdecoder setup async, so that use cases like bug 989888 can
|
|
// work. This will require teaching the state machine about dynamic track
|
|
// changes (and multiple tracks).
|
|
// Shorter term, make this block until we've got at least one video track
|
|
// and lie about having an audio track, then resample/remix as necessary
|
|
// to match any audio track added later to fit the format we lied about
|
|
// now. For now we just configure what we've got and cross our fingers.
|
|
int64_t maxDuration = -1;
|
|
for (uint32_t i = 0; i < mDecoders.Length(); ++i) {
|
|
MediaDecoderReader* reader = mDecoders[i]->GetReader();
|
|
|
|
MediaInfo mi = reader->GetMediaInfo();
|
|
|
|
if (mi.HasVideo() && !mInfo.HasVideo()) {
|
|
MOZ_ASSERT(mActiveVideoDecoder == -1);
|
|
mActiveVideoDecoder = i;
|
|
mInfo.mVideo = mi.mVideo;
|
|
maxDuration = std::max(maxDuration, mDecoders[i]->GetMediaDuration());
|
|
MSE_DEBUG("%p: MSR::ReadMetadata video decoder=%u maxDuration=%lld", this, i, maxDuration);
|
|
}
|
|
if (mi.HasAudio() && !mInfo.HasAudio()) {
|
|
MOZ_ASSERT(mActiveAudioDecoder == -1);
|
|
mActiveAudioDecoder = i;
|
|
mInfo.mAudio = mi.mAudio;
|
|
maxDuration = std::max(maxDuration, mDecoders[i]->GetMediaDuration());
|
|
MSE_DEBUG("%p: MSR::ReadMetadata audio decoder=%u maxDuration=%lld", this, i, maxDuration);
|
|
}
|
|
}
|
|
|
|
if (maxDuration != -1) {
|
|
ReentrantMonitorAutoEnter mon(mDecoder->GetReentrantMonitor());
|
|
mDecoder->SetMediaDuration(maxDuration);
|
|
ErrorResult dummy;
|
|
mMediaSource->SetDuration(maxDuration, dummy);
|
|
}
|
|
|
|
*aInfo = mInfo;
|
|
*aTags = nullptr; // TODO: Handle metadata.
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
} // namespace mozilla
|