Source code
Revision control
Other Tools
/* -*- 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
#include "ChannelMediaDecoder.h"
#include "ChannelMediaResource.h"
#include "DecoderTraits.h"
#include "MediaDecoderStateMachine.h"
#include "MediaFormatReader.h"
#include "BaseMediaResource.h"
#include "MediaShutdownManager.h"
#include "mozilla/Preferences.h"
#include "mozilla/StaticPrefs_media.h"
#include "VideoUtils.h"
namespace mozilla {
extern LazyLogModule gMediaDecoderLog;
#define LOG(x, ...) \
DDMOZ_LOG(gMediaDecoderLog, LogLevel::Debug, x, ##__VA_ARGS__)
ChannelMediaDecoder::ResourceCallback::ResourceCallback(
AbstractThread* aMainThread)
: mAbstractMainThread(aMainThread) {
MOZ_ASSERT(aMainThread);
DecoderDoctorLogger::LogConstructionAndBase(
"ChannelMediaDecoder::ResourceCallback", this,
static_cast<const MediaResourceCallback*>(this));
}
ChannelMediaDecoder::ResourceCallback::~ResourceCallback() {
DecoderDoctorLogger::LogDestruction("ChannelMediaDecoder::ResourceCallback",
this);
}
void ChannelMediaDecoder::ResourceCallback::Connect(
ChannelMediaDecoder* aDecoder) {
MOZ_ASSERT(NS_IsMainThread());
mDecoder = aDecoder;
DecoderDoctorLogger::LinkParentAndChild(
"ChannelMediaDecoder::ResourceCallback", this, "decoder", mDecoder);
mTimer = NS_NewTimer(mAbstractMainThread->AsEventTarget());
}
void ChannelMediaDecoder::ResourceCallback::Disconnect() {
MOZ_ASSERT(NS_IsMainThread());
if (mDecoder) {
DecoderDoctorLogger::UnlinkParentAndChild(
"ChannelMediaDecoder::ResourceCallback", this, mDecoder);
mDecoder = nullptr;
mTimer->Cancel();
mTimer = nullptr;
}
}
AbstractThread* ChannelMediaDecoder::ResourceCallback::AbstractMainThread()
const {
return mAbstractMainThread;
}
MediaDecoderOwner* ChannelMediaDecoder::ResourceCallback::GetMediaOwner()
const {
MOZ_ASSERT(NS_IsMainThread());
return mDecoder ? mDecoder->GetOwner() : nullptr;
}
void ChannelMediaDecoder::ResourceCallback::NotifyNetworkError(
const MediaResult& aError) {
MOZ_ASSERT(NS_IsMainThread());
DDLOGEX2("ChannelMediaDecoder::ResourceCallback", this, DDLogCategory::Log,
"network_error", aError);
if (mDecoder) {
mDecoder->NetworkError(aError);
}
}
/* static */
void ChannelMediaDecoder::ResourceCallback::TimerCallback(nsITimer* aTimer,
void* aClosure) {
MOZ_ASSERT(NS_IsMainThread());
ResourceCallback* thiz = static_cast<ResourceCallback*>(aClosure);
MOZ_ASSERT(thiz->mDecoder);
thiz->mDecoder->NotifyReaderDataArrived();
thiz->mTimerArmed = false;
}
void ChannelMediaDecoder::ResourceCallback::NotifyDataArrived() {
MOZ_ASSERT(NS_IsMainThread());
DDLOGEX2("ChannelMediaDecoder::ResourceCallback", this, DDLogCategory::Log,
"data_arrived", true);
if (!mDecoder) {
return;
}
mDecoder->DownloadProgressed();
if (mTimerArmed) {
return;
}
// In situations where these notifications come from stochastic network
// activity, we can save significant computation by throttling the
// calls to MediaDecoder::NotifyDataArrived() which will update the buffer
// ranges of the reader.
mTimerArmed = true;
mTimer->InitWithNamedFuncCallback(
TimerCallback, this, sDelay, nsITimer::TYPE_ONE_SHOT,
"ChannelMediaDecoder::ResourceCallback::TimerCallback");
}
void ChannelMediaDecoder::ResourceCallback::NotifyDataEnded(nsresult aStatus) {
DDLOGEX2("ChannelMediaDecoder::ResourceCallback", this, DDLogCategory::Log,
"data_ended", aStatus);
MOZ_ASSERT(NS_IsMainThread());
if (mDecoder) {
mDecoder->NotifyDownloadEnded(aStatus);
}
}
void ChannelMediaDecoder::ResourceCallback::NotifyPrincipalChanged() {
MOZ_ASSERT(NS_IsMainThread());
DDLOGEX2("ChannelMediaDecoder::ResourceCallback", this, DDLogCategory::Log,
"principal_changed", true);
if (mDecoder) {
mDecoder->NotifyPrincipalChanged();
}
}
void ChannelMediaDecoder::NotifyPrincipalChanged() {
MOZ_ASSERT(NS_IsMainThread());
MediaDecoder::NotifyPrincipalChanged();
if (!mInitialChannelPrincipalKnown) {
// We'll receive one notification when the channel's initial principal
// is known, after all HTTP redirects have resolved. This isn't really a
// principal change, so return here to avoid the mSameOriginMedia check
// below.
mInitialChannelPrincipalKnown = true;
return;
}
if (!mSameOriginMedia &&
Preferences::GetBool("media.block-midflight-redirects", true)) {
// Block mid-flight redirects to non CORS same origin destinations.
// See bugs 1441153, 1443942.
LOG("ChannnelMediaDecoder prohibited cross origin redirect blocked.");
NetworkError(MediaResult(NS_ERROR_DOM_BAD_URI,
"Prohibited cross origin redirect blocked"));
}
}
void ChannelMediaDecoder::ResourceCallback::NotifySuspendedStatusChanged(
bool aSuspendedByCache) {
MOZ_ASSERT(NS_IsMainThread());
DDLOGEX2("ChannelMediaDecoder::ResourceCallback", this, DDLogCategory::Log,
"suspended_status_changed", aSuspendedByCache);
MediaDecoderOwner* owner = GetMediaOwner();
if (owner) {
owner->NotifySuspendedByCache(aSuspendedByCache);
}
}
ChannelMediaDecoder::ChannelMediaDecoder(MediaDecoderInit& aInit)
: MediaDecoder(aInit),
mResourceCallback(
new ResourceCallback(aInit.mOwner->AbstractMainThread())) {
mResourceCallback->Connect(this);
}
/* static */
already_AddRefed<ChannelMediaDecoder> ChannelMediaDecoder::Create(
MediaDecoderInit& aInit, DecoderDoctorDiagnostics* aDiagnostics) {
MOZ_ASSERT(NS_IsMainThread());
RefPtr<ChannelMediaDecoder> decoder;
if (DecoderTraits::CanHandleContainerType(aInit.mContainerType,
aDiagnostics) != CANPLAY_NO) {
decoder = new ChannelMediaDecoder(aInit);
return decoder.forget();
}
return nullptr;
}
bool ChannelMediaDecoder::CanClone() {
MOZ_ASSERT(NS_IsMainThread());
return mResource && mResource->CanClone();
}
already_AddRefed<ChannelMediaDecoder> ChannelMediaDecoder::Clone(
MediaDecoderInit& aInit) {
if (!mResource || DecoderTraits::CanHandleContainerType(
aInit.mContainerType, nullptr) == CANPLAY_NO) {
return nullptr;
}
RefPtr<ChannelMediaDecoder> decoder = new ChannelMediaDecoder(aInit);
nsresult rv = decoder->Load(mResource);
if (NS_FAILED(rv)) {
decoder->Shutdown();
return nullptr;
}
return decoder.forget();
}
MediaDecoderStateMachine* ChannelMediaDecoder::CreateStateMachine() {
MOZ_ASSERT(NS_IsMainThread());
MediaFormatReaderInit init;
init.mVideoFrameContainer = GetVideoFrameContainer();
init.mKnowsCompositor = GetCompositor();
init.mCrashHelper = GetOwner()->CreateGMPCrashHelper();
init.mFrameStats = mFrameStats;
init.mResource = mResource;
init.mMediaDecoderOwnerID = mOwner;
mReader = DecoderTraits::CreateReader(ContainerType(), init);
return new MediaDecoderStateMachine(this, mReader);
}
void ChannelMediaDecoder::Shutdown() {
mResourceCallback->Disconnect();
MediaDecoder::Shutdown();
if (mResource) {
// Force any outstanding seek and byterange requests to complete
// to prevent shutdown from deadlocking.
mResourceClosePromise = mResource->Close();
}
}
void ChannelMediaDecoder::ShutdownInternal() {
if (!mResourceClosePromise) {
MediaShutdownManager::Instance().Unregister(this);
return;
}
mResourceClosePromise->Then(
AbstractMainThread(), __func__,
[self = RefPtr<ChannelMediaDecoder>(this)] {
MediaShutdownManager::Instance().Unregister(self);
});
}
nsresult ChannelMediaDecoder::Load(nsIChannel* aChannel,
bool aIsPrivateBrowsing,
nsIStreamListener** aStreamListener) {
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(!mResource);
MOZ_ASSERT(aStreamListener);
mResource = BaseMediaResource::Create(mResourceCallback, aChannel,
aIsPrivateBrowsing);
if (!mResource) {
return NS_ERROR_FAILURE;
}
DDLINKCHILD("resource", mResource.get());
nsresult rv = MediaShutdownManager::Instance().Register(this);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
rv = mResource->Open(aStreamListener);
NS_ENSURE_SUCCESS(rv, rv);
SetStateMachine(CreateStateMachine());
NS_ENSURE_TRUE(GetStateMachine(), NS_ERROR_FAILURE);
GetStateMachine()->DispatchIsLiveStream(mResource->IsLiveStream());
return InitializeStateMachine();
}
nsresult ChannelMediaDecoder::Load(BaseMediaResource* aOriginal) {
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(!mResource);
mResource = aOriginal->CloneData(mResourceCallback);
if (!mResource) {
return NS_ERROR_FAILURE;
}
DDLINKCHILD("resource", mResource.get());
nsresult rv = MediaShutdownManager::Instance().Register(this);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
SetStateMachine(CreateStateMachine());
NS_ENSURE_TRUE(GetStateMachine(), NS_ERROR_FAILURE);
GetStateMachine()->DispatchIsLiveStream(mResource->IsLiveStream());
return InitializeStateMachine();
}
void ChannelMediaDecoder::NotifyDownloadEnded(nsresult aStatus) {
MOZ_ASSERT(NS_IsMainThread());
MOZ_DIAGNOSTIC_ASSERT(!IsShutdown());
LOG("NotifyDownloadEnded, status=%" PRIx32, static_cast<uint32_t>(aStatus));
if (NS_SUCCEEDED(aStatus)) {
// Download ends successfully. This is a stream with a finite length.
GetStateMachine()->DispatchIsLiveStream(false);
}
MediaDecoderOwner* owner = GetOwner();
if (NS_SUCCEEDED(aStatus) || aStatus == NS_BASE_STREAM_CLOSED) {
nsCOMPtr<nsIRunnable> r = NS_NewRunnableFunction(
"ChannelMediaDecoder::UpdatePlaybackRate",
[stats = mPlaybackStatistics,
res = RefPtr<BaseMediaResource>(mResource), duration = mDuration]() {
auto rate = ComputePlaybackRate(stats, res, duration);
UpdatePlaybackRate(rate, res);
});
nsresult rv = GetStateMachine()->OwnerThread()->Dispatch(r.forget());
MOZ_DIAGNOSTIC_ASSERT(NS_SUCCEEDED(rv));
Unused << rv;
owner->DownloadSuspended();
// NotifySuspendedStatusChanged will tell the element that download
// has been suspended "by the cache", which is true since we never
// download anything. The element can then transition to HAVE_ENOUGH_DATA.
owner->NotifySuspendedByCache(true);
} else if (aStatus == NS_BINDING_ABORTED) {
// Download has been cancelled by user.
owner->LoadAborted();
} else {
NetworkError(MediaResult(aStatus, "Download aborted"));
}
}
bool ChannelMediaDecoder::CanPlayThroughImpl() {
MOZ_ASSERT(NS_IsMainThread());
return mCanPlayThrough;
}
void ChannelMediaDecoder::OnPlaybackEvent(MediaPlaybackEvent&& aEvent) {
MOZ_ASSERT(NS_IsMainThread());
switch (aEvent.mType) {
case MediaPlaybackEvent::PlaybackStarted:
mPlaybackPosition = aEvent.mData.as<int64_t>();
mPlaybackStatistics.Start();
break;
case MediaPlaybackEvent::PlaybackProgressed: {
int64_t newPos = aEvent.mData.as<int64_t>();
mPlaybackStatistics.AddBytes(newPos - mPlaybackPosition);
mPlaybackPosition = newPos;
break;
}
case MediaPlaybackEvent::PlaybackStopped: {
int64_t newPos = aEvent.mData.as<int64_t>();
mPlaybackStatistics.AddBytes(newPos - mPlaybackPosition);
mPlaybackPosition = newPos;
mPlaybackStatistics.Stop();
break;
}
default:
break;
}
MediaDecoder::OnPlaybackEvent(std::move(aEvent));
}
void ChannelMediaDecoder::DurationChanged() {
MOZ_ASSERT(NS_IsMainThread());
MediaDecoder::DurationChanged();
// Duration has changed so we should recompute playback rate
nsCOMPtr<nsIRunnable> r = NS_NewRunnableFunction(
"ChannelMediaDecoder::UpdatePlaybackRate",
[stats = mPlaybackStatistics, res = RefPtr<BaseMediaResource>(mResource),
duration = mDuration]() {
auto rate = ComputePlaybackRate(stats, res, duration);
UpdatePlaybackRate(rate, res);
});
nsresult rv = GetStateMachine()->OwnerThread()->Dispatch(r.forget());
MOZ_DIAGNOSTIC_ASSERT(NS_SUCCEEDED(rv));
Unused << rv;
}
void ChannelMediaDecoder::DownloadProgressed() {
MOZ_ASSERT(NS_IsMainThread());
MOZ_DIAGNOSTIC_ASSERT(!IsShutdown());
GetOwner()->DownloadProgressed();
using StatsPromise = MozPromise<MediaStatistics, bool, true>;
InvokeAsync(GetStateMachine()->OwnerThread(), __func__,
[playbackStats = mPlaybackStatistics,
res = RefPtr<BaseMediaResource>(mResource), duration = mDuration,
pos = mPlaybackPosition]() {
auto rate = ComputePlaybackRate(playbackStats, res, duration);
UpdatePlaybackRate(rate, res);
MediaStatistics stats = GetStatistics(rate, res, pos);
return StatsPromise::CreateAndResolve(stats, __func__);
})
->Then(
mAbstractMainThread, __func__,
[=,
self = RefPtr<ChannelMediaDecoder>(this)](MediaStatistics aStats) {
if (IsShutdown()) {
return;
}
mCanPlayThrough = aStats.CanPlayThrough();
GetStateMachine()->DispatchCanPlayThrough(mCanPlayThrough);
mResource->ThrottleReadahead(ShouldThrottleDownload(aStats));
// Update readyState since mCanPlayThrough might have changed.
GetOwner()->UpdateReadyState();
},
[]() { MOZ_ASSERT_UNREACHABLE("Promise not resolved"); });
}
/* static */ ChannelMediaDecoder::PlaybackRateInfo
ChannelMediaDecoder::ComputePlaybackRate(const MediaChannelStatistics& aStats,
BaseMediaResource* aResource,
double aDuration) {
MOZ_ASSERT(!NS_IsMainThread());
int64_t length = aResource->GetLength();
if (mozilla::IsFinite<double>(aDuration) && aDuration > 0 && length >= 0 &&
length / aDuration < UINT32_MAX) {
return {uint32_t(length / aDuration), true};
}
bool reliable = false;
uint32_t rate = aStats.GetRate(&reliable);
return {rate, reliable};
}
/* static */
void ChannelMediaDecoder::UpdatePlaybackRate(const PlaybackRateInfo& aInfo,
BaseMediaResource* aResource) {
MOZ_ASSERT(!NS_IsMainThread());
uint32_t rate = aInfo.mRate;
if (aInfo.mReliable) {
// Avoid passing a zero rate
rate = std::max(rate, 1u);
} else {
// Set a minimum rate of 10,000 bytes per second ... sometimes we just
// don't have good data
rate = std::max(rate, 10000u);
}
aResource->SetPlaybackRate(rate);
}
/* static */
MediaStatistics ChannelMediaDecoder::GetStatistics(
const PlaybackRateInfo& aInfo, BaseMediaResource* aRes,
int64_t aPlaybackPosition) {
MOZ_ASSERT(!NS_IsMainThread());
MediaStatistics result;
result.mDownloadRate = aRes->GetDownloadRate(&result.mDownloadRateReliable);
result.mDownloadPosition = aRes->GetCachedDataEnd(aPlaybackPosition);
result.mTotalBytes = aRes->GetLength();
result.mPlaybackRate = aInfo.mRate;
result.mPlaybackRateReliable = aInfo.mReliable;
result.mPlaybackPosition = aPlaybackPosition;
return result;
}
bool ChannelMediaDecoder::ShouldThrottleDownload(
const MediaStatistics& aStats) {
// We throttle the download if either the throttle override pref is set
// (so that we always throttle at the readahead limit on mobile if using
// a cellular network) or if the download is fast enough that there's no
// concern about playback being interrupted.
MOZ_ASSERT(NS_IsMainThread());
NS_ENSURE_TRUE(GetStateMachine(), false);
int64_t length = aStats.mTotalBytes;
if (length > 0 &&
length <= int64_t(StaticPrefs::media_memory_cache_max_size()) * 1024) {
// Don't throttle the download of small resources. This is to speed
// up seeking, as seeks into unbuffered ranges would require starting
// up a new HTTP transaction, which adds latency.
return false;
}
if (OnCellularConnection() &&
Preferences::GetBool(
"media.throttle-cellular-regardless-of-download-rate", false)) {
return true;
}
if (!aStats.mDownloadRateReliable || !aStats.mPlaybackRateReliable) {
return false;
}
uint32_t factor =
std::max(2u, Preferences::GetUint("media.throttle-factor", 2));
return aStats.mDownloadRate > factor * aStats.mPlaybackRate;
}
void ChannelMediaDecoder::AddSizeOfResources(ResourceSizes* aSizes) {
MOZ_ASSERT(NS_IsMainThread());
if (mResource) {
aSizes->mByteSize += mResource->SizeOfIncludingThis(aSizes->mMallocSizeOf);
}
}
already_AddRefed<nsIPrincipal> ChannelMediaDecoder::GetCurrentPrincipal() {
MOZ_ASSERT(NS_IsMainThread());
return mResource ? mResource->GetCurrentPrincipal() : nullptr;
}
bool ChannelMediaDecoder::HadCrossOriginRedirects() {
MOZ_ASSERT(NS_IsMainThread());
return mResource ? mResource->HadCrossOriginRedirects() : false;
}
bool ChannelMediaDecoder::IsTransportSeekable() {
MOZ_ASSERT(NS_IsMainThread());
return mResource->IsTransportSeekable();
}
void ChannelMediaDecoder::SetLoadInBackground(bool aLoadInBackground) {
MOZ_ASSERT(NS_IsMainThread());
if (mResource) {
mResource->SetLoadInBackground(aLoadInBackground);
}
}
void ChannelMediaDecoder::Suspend() {
MOZ_ASSERT(NS_IsMainThread());
if (mResource) {
mResource->Suspend(true);
}
MediaDecoder::Suspend();
}
void ChannelMediaDecoder::Resume() {
MOZ_ASSERT(NS_IsMainThread());
if (mResource) {
mResource->Resume();
}
MediaDecoder::Resume();
}
void ChannelMediaDecoder::MetadataLoaded(
UniquePtr<MediaInfo> aInfo, UniquePtr<MetadataTags> aTags,
MediaDecoderEventVisibility aEventVisibility) {
MediaDecoder::MetadataLoaded(std::move(aInfo), std::move(aTags),
aEventVisibility);
// Set mode to PLAYBACK after reading metadata.
mResource->SetReadMode(MediaCacheStream::MODE_PLAYBACK);
}
void ChannelMediaDecoder::GetDebugInfo(dom::MediaDecoderDebugInfo& aInfo) {
MediaDecoder::GetDebugInfo(aInfo);
if (mResource) {
mResource->GetDebugInfo(aInfo.mResource);
}
}
} // namespace mozilla
// avoid redefined macro in unified build
#undef LOG