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gecko-dev/dom/media/ChannelMediaResource.cpp

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/* 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/. */
#include "ChannelMediaResource.h"
#include "mozilla/dom/HTMLMediaElement.h"
#include "nsIAsyncVerifyRedirectCallback.h"
#include "nsICachingChannel.h"
#include "nsIClassOfService.h"
#include "nsIInputStream.h"
#include "nsIThreadRetargetableRequest.h"
#include "nsNetUtil.h"
static const uint32_t HTTP_PARTIAL_RESPONSE_CODE = 206;
static const uint32_t HTTP_OK_CODE = 200;
static const uint32_t HTTP_REQUESTED_RANGE_NOT_SATISFIABLE_CODE = 416;
mozilla::LazyLogModule gMediaResourceLog("MediaResource");
// Debug logging macro with object pointer and class name.
#define LOG(msg, ...) \
DDMOZ_LOG(gMediaResourceLog, mozilla::LogLevel::Debug, msg, ##__VA_ARGS__)
namespace mozilla {
ChannelMediaResource::ChannelMediaResource(MediaResourceCallback* aCallback,
nsIChannel* aChannel,
nsIURI* aURI,
bool aIsPrivateBrowsing)
: BaseMediaResource(aCallback, aChannel, aURI)
, mCacheStream(this, aIsPrivateBrowsing)
, mSuspendAgent(mCacheStream)
{
}
ChannelMediaResource::~ChannelMediaResource()
{
MOZ_ASSERT(mClosed);
MOZ_ASSERT(!mChannel);
MOZ_ASSERT(!mListener);
if (mSharedInfo) {
mSharedInfo->mResources.RemoveElement(this);
}
}
// ChannelMediaResource::Listener just observes the channel and
// forwards notifications to the ChannelMediaResource. We use multiple
// listener objects so that when we open a new stream for a seek we can
// disconnect the old listener from the ChannelMediaResource and hook up
// a new listener, so notifications from the old channel are discarded
// and don't confuse us.
NS_IMPL_ISUPPORTS(ChannelMediaResource::Listener,
nsIRequestObserver,
nsIStreamListener,
nsIChannelEventSink,
nsIInterfaceRequestor,
nsIThreadRetargetableStreamListener)
nsresult
ChannelMediaResource::Listener::OnStartRequest(nsIRequest* aRequest,
nsISupports* aContext)
{
MOZ_ASSERT(NS_IsMainThread());
if (!mResource)
return NS_OK;
return mResource->OnStartRequest(aRequest, mOffset);
}
nsresult
ChannelMediaResource::Listener::OnStopRequest(nsIRequest* aRequest,
nsISupports* aContext,
nsresult aStatus)
{
MOZ_ASSERT(NS_IsMainThread());
if (!mResource)
return NS_OK;
return mResource->OnStopRequest(aRequest, aStatus);
}
nsresult
ChannelMediaResource::Listener::OnDataAvailable(nsIRequest* aRequest,
nsISupports* aContext,
nsIInputStream* aStream,
uint64_t aOffset,
uint32_t aCount)
{
// This might happen off the main thread.
RefPtr<ChannelMediaResource> res;
{
MutexAutoLock lock(mMutex);
res = mResource;
}
// Note Rekove() might happen at the same time to reset mResource. We check
// the load ID to determine if the data is from an old channel.
return res ? res->OnDataAvailable(mLoadID, aStream, aCount) : NS_OK;
}
nsresult
ChannelMediaResource::Listener::AsyncOnChannelRedirect(
nsIChannel* aOld,
nsIChannel* aNew,
uint32_t aFlags,
nsIAsyncVerifyRedirectCallback* cb)
{
MOZ_ASSERT(NS_IsMainThread());
nsresult rv = NS_OK;
if (mResource) {
rv = mResource->OnChannelRedirect(aOld, aNew, aFlags, mOffset);
}
if (NS_FAILED(rv)) {
return rv;
}
cb->OnRedirectVerifyCallback(NS_OK);
return NS_OK;
}
nsresult
ChannelMediaResource::Listener::CheckListenerChain()
{
return NS_OK;
}
nsresult
ChannelMediaResource::Listener::GetInterface(const nsIID& aIID, void** aResult)
{
return QueryInterface(aIID, aResult);
}
void
ChannelMediaResource::Listener::Revoke()
{
MOZ_ASSERT(NS_IsMainThread());
MutexAutoLock lock(mMutex);
mResource = nullptr;
}
static bool
IsPayloadCompressed(nsIHttpChannel* aChannel)
{
nsAutoCString encoding;
Unused << aChannel->GetResponseHeader(NS_LITERAL_CSTRING("Content-Encoding"), encoding);
return encoding.Length() > 0;
}
nsresult
ChannelMediaResource::OnStartRequest(nsIRequest* aRequest,
int64_t aRequestOffset)
{
NS_ASSERTION(mChannel.get() == aRequest, "Wrong channel!");
MOZ_DIAGNOSTIC_ASSERT(!mClosed);
MediaDecoderOwner* owner = mCallback->GetMediaOwner();
MOZ_DIAGNOSTIC_ASSERT(owner);
dom::HTMLMediaElement* element = owner->GetMediaElement();
MOZ_DIAGNOSTIC_ASSERT(element);
nsresult status;
nsresult rv = aRequest->GetStatus(&status);
NS_ENSURE_SUCCESS(rv, rv);
if (status == NS_BINDING_ABORTED) {
// Request was aborted before we had a chance to receive any data, or
// even an OnStartRequest(). Close the channel. This is important, as
// we don't want to mess up our state, as if we're cloned that would
// cause the clone to copy incorrect metadata (like whether we're
// infinite for example).
CloseChannel();
return status;
}
if (element->ShouldCheckAllowOrigin()) {
// If the request was cancelled by nsCORSListenerProxy due to failing
// the CORS security check, send an error through to the media element.
if (status == NS_ERROR_DOM_BAD_URI) {
mCallback->NotifyNetworkError(MediaResult(status, "CORS not allowed"));
return NS_ERROR_DOM_BAD_URI;
}
}
nsCOMPtr<nsIHttpChannel> hc = do_QueryInterface(aRequest);
bool seekable = false;
int64_t length = -1;
int64_t startOffset = aRequestOffset;
if (hc) {
uint32_t responseStatus = 0;
Unused << hc->GetResponseStatus(&responseStatus);
bool succeeded = false;
Unused << hc->GetRequestSucceeded(&succeeded);
if (!succeeded && NS_SUCCEEDED(status)) {
// HTTP-level error (e.g. 4xx); treat this as a fatal network-level error.
// We might get this on a seek.
// (Note that lower-level errors indicated by NS_FAILED(status) are
// handled in OnStopRequest.)
// A 416 error should treated as EOF here... it's possible
// that we don't get Content-Length, we read N bytes, then we
// suspend and resume, the resume reopens the channel and we seek to
// offset N, but there are no more bytes, so we get a 416
// "Requested Range Not Satisfiable".
if (responseStatus == HTTP_REQUESTED_RANGE_NOT_SATISFIABLE_CODE) {
// OnStopRequest will not be fired, so we need to do some of its
// work here. Note we need to pass the load ID first so the following
// NotifyDataEnded() can pass the ID check.
mCacheStream.NotifyLoadID(mLoadID);
mCacheStream.NotifyDataEnded(mLoadID, status);
} else {
mCallback->NotifyNetworkError(
MediaResult(NS_ERROR_FAILURE, "HTTP error"));
}
// This disconnects our listener so we don't get any more data. We
// certainly don't want an error page to end up in our cache!
CloseChannel();
return NS_OK;
}
nsAutoCString ranges;
Unused << hc->GetResponseHeader(NS_LITERAL_CSTRING("Accept-Ranges"),
ranges);
bool acceptsRanges = ranges.EqualsLiteral("bytes");
int64_t contentLength = -1;
const bool isCompressed = IsPayloadCompressed(hc);
if (!isCompressed) {
hc->GetContentLength(&contentLength);
}
// Check response code for byte-range requests (seeking, chunk requests).
// We don't expect to get a 206 response for a compressed stream, but
// double check just to be sure.
if (!isCompressed && responseStatus == HTTP_PARTIAL_RESPONSE_CODE) {
// Parse Content-Range header.
int64_t rangeStart = 0;
int64_t rangeEnd = 0;
int64_t rangeTotal = 0;
rv = ParseContentRangeHeader(hc, rangeStart, rangeEnd, rangeTotal);
// We received 'Content-Range', so the server accepts range requests.
bool gotRangeHeader = NS_SUCCEEDED(rv);
if (gotRangeHeader) {
startOffset = rangeStart;
// We received 'Content-Range', so the server accepts range requests.
// Notify media cache about the length and start offset of data received.
// Note: If aRangeTotal == -1, then the total bytes is unknown at this stage.
// For now, tell the decoder that the stream is infinite.
if (rangeTotal != -1) {
contentLength = std::max(contentLength, rangeTotal);
}
}
acceptsRanges = gotRangeHeader;
} else if (responseStatus == HTTP_OK_CODE) {
// HTTP_OK_CODE means data will be sent from the start of the stream.
startOffset = 0;
if (aRequestOffset > 0) {
// If HTTP_OK_CODE is responded for a non-zero range request, we have
// to assume seeking doesn't work.
acceptsRanges = false;
}
}
if (aRequestOffset == 0 && contentLength >= 0 &&
(responseStatus == HTTP_OK_CODE ||
responseStatus == HTTP_PARTIAL_RESPONSE_CODE)) {
length = contentLength;
}
// XXX we probably should examine the Content-Range header in case
// the server gave us a range which is not quite what we asked for
// If we get an HTTP_OK_CODE response to our byte range request,
// and the server isn't sending Accept-Ranges:bytes then we don't
// support seeking. We also can't seek in compressed streams.
seekable = !isCompressed && acceptsRanges;
} else {
// Not an HTTP channel. Assume data will be sent from position zero.
startOffset = 0;
}
// Update principals before OnDataAvailable() putting the data in the cache.
// This is important, we want to make sure all principals are updated before
// any consumer can see the new data.
UpdatePrincipal();
mCacheStream.NotifyDataStarted(mLoadID, startOffset, seekable, length);
mIsTransportSeekable = seekable;
mSuspendAgent.Delegate(mChannel);
// Fires an initial progress event.
owner->DownloadProgressed();
nsCOMPtr<nsIThreadRetargetableRequest> retarget;
if (Preferences::GetBool("media.omt_data_delivery.enabled", false) &&
(retarget = do_QueryInterface(aRequest))) {
// Note this will not always succeed. We need to handle the case where
// all resources sharing the same cache might run their data callbacks
// on different threads.
retarget->RetargetDeliveryTo(mCacheStream.OwnerThread());
}
return NS_OK;
}
bool
ChannelMediaResource::IsTransportSeekable()
{
MOZ_ASSERT(NS_IsMainThread());
return mIsTransportSeekable;
}
nsresult
ChannelMediaResource::ParseContentRangeHeader(nsIHttpChannel * aHttpChan,
int64_t& aRangeStart,
int64_t& aRangeEnd,
int64_t& aRangeTotal)
{
NS_ENSURE_ARG(aHttpChan);
nsAutoCString rangeStr;
nsresult rv = aHttpChan->GetResponseHeader(NS_LITERAL_CSTRING("Content-Range"),
rangeStr);
NS_ENSURE_SUCCESS(rv, rv);
NS_ENSURE_FALSE(rangeStr.IsEmpty(), NS_ERROR_ILLEGAL_VALUE);
// Parse the range header: e.g. Content-Range: bytes 7000-7999/8000.
int32_t spacePos = rangeStr.Find(NS_LITERAL_CSTRING(" "));
int32_t dashPos = rangeStr.Find(NS_LITERAL_CSTRING("-"), true, spacePos);
int32_t slashPos = rangeStr.Find(NS_LITERAL_CSTRING("/"), true, dashPos);
nsAutoCString aRangeStartText;
rangeStr.Mid(aRangeStartText, spacePos+1, dashPos-(spacePos+1));
aRangeStart = aRangeStartText.ToInteger64(&rv);
NS_ENSURE_SUCCESS(rv, rv);
NS_ENSURE_TRUE(0 <= aRangeStart, NS_ERROR_ILLEGAL_VALUE);
nsAutoCString aRangeEndText;
rangeStr.Mid(aRangeEndText, dashPos+1, slashPos-(dashPos+1));
aRangeEnd = aRangeEndText.ToInteger64(&rv);
NS_ENSURE_SUCCESS(rv, rv);
NS_ENSURE_TRUE(aRangeStart < aRangeEnd, NS_ERROR_ILLEGAL_VALUE);
nsAutoCString aRangeTotalText;
rangeStr.Right(aRangeTotalText, rangeStr.Length()-(slashPos+1));
if (aRangeTotalText[0] == '*') {
aRangeTotal = -1;
} else {
aRangeTotal = aRangeTotalText.ToInteger64(&rv);
NS_ENSURE_TRUE(aRangeEnd < aRangeTotal, NS_ERROR_ILLEGAL_VALUE);
NS_ENSURE_SUCCESS(rv, rv);
}
LOG("Received bytes [%" PRId64 "] to [%" PRId64 "] of [%" PRId64 "] for decoder[%p]",
aRangeStart, aRangeEnd, aRangeTotal, mCallback.get());
return NS_OK;
}
nsresult
ChannelMediaResource::OnStopRequest(nsIRequest* aRequest, nsresult aStatus)
{
NS_ASSERTION(mChannel.get() == aRequest, "Wrong channel!");
NS_ASSERTION(!mSuspendAgent.IsSuspended(),
"How can OnStopRequest fire while we're suspended?");
MOZ_DIAGNOSTIC_ASSERT(!mClosed);
// Move this request back into the foreground. This is necessary for
// requests owned by video documents to ensure the load group fires
// OnStopRequest when restoring from session history.
nsLoadFlags loadFlags;
DebugOnly<nsresult> rv = mChannel->GetLoadFlags(&loadFlags);
NS_ASSERTION(NS_SUCCEEDED(rv), "GetLoadFlags() failed!");
if (loadFlags & nsIRequest::LOAD_BACKGROUND) {
ModifyLoadFlags(loadFlags & ~nsIRequest::LOAD_BACKGROUND);
}
mCacheStream.NotifyDataEnded(mLoadID, aStatus, true /*aReopenOnError*/);
return NS_OK;
}
nsresult
ChannelMediaResource::OnChannelRedirect(nsIChannel* aOld,
nsIChannel* aNew,
uint32_t aFlags,
int64_t aOffset)
{
// OnChannelRedirect() is followed by OnStartRequest() where we will
// call mSuspendAgent.Delegate().
mChannel = aNew;
return SetupChannelHeaders(aOffset);
}
nsresult
ChannelMediaResource::CopySegmentToCache(nsIInputStream* aInStream,
void* aClosure,
const char* aFromSegment,
uint32_t aToOffset,
uint32_t aCount,
uint32_t* aWriteCount)
{
*aWriteCount = aCount;
Closure* closure = static_cast<Closure*>(aClosure);
MediaCacheStream* cacheStream = &closure->mResource->mCacheStream;
if (cacheStream->OwnerThread()->IsOnCurrentThread()) {
cacheStream->NotifyDataReceived(
closure->mLoadID, aCount, reinterpret_cast<const uint8_t*>(aFromSegment));
return NS_OK;
}
RefPtr<ChannelMediaResource> self = closure->mResource;
uint32_t loadID = closure->mLoadID;
UniquePtr<uint8_t[]> data = MakeUnique<uint8_t[]>(aCount);
memcpy(data.get(), aFromSegment, aCount);
cacheStream->OwnerThread()->Dispatch(NS_NewRunnableFunction(
"MediaCacheStream::NotifyDataReceived",
[ self, loadID, data = Move(data), aCount ]() {
self->mCacheStream.NotifyDataReceived(loadID, aCount, data.get());
}));
return NS_OK;
}
nsresult
ChannelMediaResource::OnDataAvailable(uint32_t aLoadID,
nsIInputStream* aStream,
uint32_t aCount)
{
// This might happen off the main thread.
Closure closure{ aLoadID, this };
uint32_t count = aCount;
while (count > 0) {
uint32_t read;
nsresult rv =
aStream->ReadSegments(CopySegmentToCache, &closure, count, &read);
if (NS_FAILED(rv))
return rv;
NS_ASSERTION(read > 0, "Read 0 bytes while data was available?");
count -= read;
}
return NS_OK;
}
nsresult
ChannelMediaResource::Open(nsIStreamListener** aStreamListener)
{
NS_ASSERTION(NS_IsMainThread(), "Only call on main thread");
MOZ_ASSERT(aStreamListener);
MOZ_ASSERT(mChannel);
int64_t cl = -1;
nsCOMPtr<nsIHttpChannel> hc = do_QueryInterface(mChannel);
if (hc && !IsPayloadCompressed(hc)) {
if (NS_FAILED(hc->GetContentLength(&cl))) {
cl = -1;
}
}
nsresult rv = mCacheStream.Init(cl);
if (NS_FAILED(rv)) {
return rv;
}
mSharedInfo = new SharedInfo;
mSharedInfo->mResources.AppendElement(this);
mIsLiveStream = cl < 0;
mListener = new Listener(this, 0, ++mLoadID);
*aStreamListener = mListener;
NS_ADDREF(*aStreamListener);
return NS_OK;
}
nsresult
ChannelMediaResource::OpenChannel(int64_t aOffset)
{
MOZ_ASSERT(NS_IsMainThread());
MOZ_DIAGNOSTIC_ASSERT(!mClosed);
MOZ_ASSERT(mChannel);
MOZ_ASSERT(!mListener, "Listener should have been removed by now");
mListener = new Listener(this, aOffset, ++mLoadID);
nsresult rv = mChannel->SetNotificationCallbacks(mListener.get());
NS_ENSURE_SUCCESS(rv, rv);
rv = SetupChannelHeaders(aOffset);
NS_ENSURE_SUCCESS(rv, rv);
rv = mChannel->AsyncOpen2(mListener);
NS_ENSURE_SUCCESS(rv, rv);
// Tell the media element that we are fetching data from a channel.
MediaDecoderOwner* owner = mCallback->GetMediaOwner();
MOZ_DIAGNOSTIC_ASSERT(owner);
dom::HTMLMediaElement* element = owner->GetMediaElement();
MOZ_DIAGNOSTIC_ASSERT(element);
element->DownloadResumed();
return NS_OK;
}
nsresult
ChannelMediaResource::SetupChannelHeaders(int64_t aOffset)
{
MOZ_ASSERT(NS_IsMainThread());
MOZ_DIAGNOSTIC_ASSERT(!mClosed);
// Always use a byte range request even if we're reading from the start
// of the resource.
// This enables us to detect if the stream supports byte range
// requests, and therefore seeking, early.
nsCOMPtr<nsIHttpChannel> hc = do_QueryInterface(mChannel);
if (hc) {
// Use |mOffset| if seeking in a complete file download.
nsAutoCString rangeString("bytes=");
rangeString.AppendInt(aOffset);
rangeString.Append('-');
nsresult rv = hc->SetRequestHeader(NS_LITERAL_CSTRING("Range"), rangeString, false);
NS_ENSURE_SUCCESS(rv, rv);
// Send Accept header for video and audio types only (Bug 489071)
MediaDecoderOwner* owner = mCallback->GetMediaOwner();
MOZ_DIAGNOSTIC_ASSERT(owner);
dom::HTMLMediaElement* element = owner->GetMediaElement();
MOZ_DIAGNOSTIC_ASSERT(element);
element->SetRequestHeaders(hc);
} else {
NS_ASSERTION(aOffset == 0, "Don't know how to seek on this channel type");
return NS_ERROR_FAILURE;
}
return NS_OK;
}
nsresult ChannelMediaResource::Close()
{
NS_ASSERTION(NS_IsMainThread(), "Only call on main thread");
if (!mClosed) {
CloseChannel();
mCacheStream.Close();
mClosed = true;
}
return NS_OK;
}
already_AddRefed<nsIPrincipal>
ChannelMediaResource::GetCurrentPrincipal()
{
MOZ_ASSERT(NS_IsMainThread());
return do_AddRef(mSharedInfo->mPrincipal);
}
bool ChannelMediaResource::CanClone()
{
return !mClosed && mCacheStream.IsAvailableForSharing();
}
already_AddRefed<BaseMediaResource>
ChannelMediaResource::CloneData(MediaResourceCallback* aCallback)
{
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(CanClone(), "Stream can't be cloned");
RefPtr<ChannelMediaResource> resource =
new ChannelMediaResource(aCallback, nullptr, mURI);
resource->mIsLiveStream = mIsLiveStream;
resource->mIsTransportSeekable = mIsTransportSeekable;
resource->mSharedInfo = mSharedInfo;
mSharedInfo->mResources.AppendElement(resource.get());
// Initially the clone is treated as suspended by the cache, because
// we don't have a channel. If the cache needs to read data from the clone
// it will call CacheClientResume (or CacheClientSeek with aResume true)
// which will recreate the channel. This way, if all of the media data
// is already in the cache we don't create an unnecessary HTTP channel
// and perform a useless HTTP transaction.
resource->mCacheStream.InitAsClone(&mCacheStream);
return resource.forget();
}
void ChannelMediaResource::CloseChannel()
{
NS_ASSERTION(NS_IsMainThread(), "Only call on main thread");
if (mChannel) {
mSuspendAgent.Revoke();
// The status we use here won't be passed to the decoder, since
// we've already revoked the listener. It can however be passed
// to nsDocumentViewer::LoadComplete if our channel is the one
// that kicked off creation of a video document. We don't want that
// document load to think there was an error.
// NS_ERROR_PARSED_DATA_CACHED is the best thing we have for that
// at the moment.
mChannel->Cancel(NS_ERROR_PARSED_DATA_CACHED);
mChannel = nullptr;
}
if (mListener) {
mListener->Revoke();
mListener = nullptr;
}
}
nsresult ChannelMediaResource::ReadFromCache(char* aBuffer,
int64_t aOffset,
uint32_t aCount)
{
return mCacheStream.ReadFromCache(aBuffer, aOffset, aCount);
}
nsresult ChannelMediaResource::ReadAt(int64_t aOffset,
char* aBuffer,
uint32_t aCount,
uint32_t* aBytes)
{
NS_ASSERTION(!NS_IsMainThread(), "Don't call on main thread");
return mCacheStream.ReadAt(aOffset, aBuffer, aCount, aBytes);
}
void
ChannelMediaResource::ThrottleReadahead(bool bThrottle)
{
mCacheStream.ThrottleReadahead(bThrottle);
}
nsresult ChannelMediaResource::GetCachedRanges(MediaByteRangeSet& aRanges)
{
return mCacheStream.GetCachedRanges(aRanges);
}
void
ChannelMediaResource::Suspend(bool aCloseImmediately)
{
NS_ASSERTION(NS_IsMainThread(), "Don't call on non-main thread");
if (mClosed) {
// Nothing to do when we are closed.
return;
}
MediaDecoderOwner* owner = mCallback->GetMediaOwner();
MOZ_DIAGNOSTIC_ASSERT(owner);
dom::HTMLMediaElement* element = owner->GetMediaElement();
MOZ_DIAGNOSTIC_ASSERT(element);
if (mChannel && aCloseImmediately && mIsTransportSeekable) {
CloseChannel();
}
if (mSuspendAgent.Suspend()) {
element->DownloadSuspended();
}
}
void
ChannelMediaResource::Resume()
{
NS_ASSERTION(NS_IsMainThread(), "Don't call on non-main thread");
if (mClosed) {
// Nothing to do when we are closed.
return;
}
MediaDecoderOwner* owner = mCallback->GetMediaOwner();
MOZ_DIAGNOSTIC_ASSERT(owner);
dom::HTMLMediaElement* element = owner->GetMediaElement();
MOZ_DIAGNOSTIC_ASSERT(element);
if (mSuspendAgent.Resume()) {
if (mChannel) {
// Just wake up our existing channel
element->DownloadResumed();
} else {
mCacheStream.NotifyResume();
}
}
}
nsresult
ChannelMediaResource::RecreateChannel()
{
MOZ_DIAGNOSTIC_ASSERT(!mClosed);
nsLoadFlags loadFlags =
nsICachingChannel::LOAD_BYPASS_LOCAL_CACHE_IF_BUSY |
nsIChannel::LOAD_CLASSIFY_URI |
(mLoadInBackground ? nsIRequest::LOAD_BACKGROUND : 0);
MediaDecoderOwner* owner = mCallback->GetMediaOwner();
MOZ_DIAGNOSTIC_ASSERT(owner);
dom::HTMLMediaElement* element = owner->GetMediaElement();
MOZ_DIAGNOSTIC_ASSERT(element);
nsCOMPtr<nsILoadGroup> loadGroup = element->GetDocumentLoadGroup();
NS_ENSURE_TRUE(loadGroup, NS_ERROR_NULL_POINTER);
nsSecurityFlags securityFlags = element->ShouldCheckAllowOrigin()
? nsILoadInfo::SEC_REQUIRE_CORS_DATA_INHERITS
: nsILoadInfo::SEC_ALLOW_CROSS_ORIGIN_DATA_INHERITS;
MOZ_ASSERT(element->IsAnyOfHTMLElements(nsGkAtoms::audio, nsGkAtoms::video));
nsContentPolicyType contentPolicyType = element->IsHTMLElement(nsGkAtoms::audio) ?
nsIContentPolicy::TYPE_INTERNAL_AUDIO : nsIContentPolicy::TYPE_INTERNAL_VIDEO;
// If element has 'triggeringprincipal' attribute, we will use the value as
// triggeringPrincipal for the channel, otherwise it will default to use
// aElement->NodePrincipal().
// This function returns true when element has 'triggeringprincipal', so if
// setAttrs is true we will override the origin attributes on the channel
// later.
nsCOMPtr<nsIPrincipal> triggeringPrincipal;
bool setAttrs =
nsContentUtils::QueryTriggeringPrincipal(element,
getter_AddRefs(triggeringPrincipal));
nsresult rv = NS_NewChannelWithTriggeringPrincipal(getter_AddRefs(mChannel),
mURI,
element,
triggeringPrincipal,
securityFlags,
contentPolicyType,
nullptr, // aPerformanceStorage
loadGroup,
nullptr, // aCallbacks
loadFlags);
NS_ENSURE_SUCCESS(rv, rv);
if (setAttrs) {
nsCOMPtr<nsILoadInfo> loadInfo = mChannel->GetLoadInfo();
if (loadInfo) {
// The function simply returns NS_OK, so we ignore the return value.
Unused << loadInfo->SetOriginAttributes(triggeringPrincipal->OriginAttributesRef());
}
}
nsCOMPtr<nsIClassOfService> cos(do_QueryInterface(mChannel));
if (cos) {
// Unconditionally disable throttling since we want the media to fluently
// play even when we switch the tab to background.
cos->AddClassFlags(nsIClassOfService::DontThrottle);
}
return rv;
}
void
ChannelMediaResource::CacheClientNotifyDataReceived()
{
mCallback->AbstractMainThread()->Dispatch(
NewRunnableMethod("MediaResourceCallback::NotifyDataArrived",
mCallback.get(),
&MediaResourceCallback::NotifyDataArrived));
}
void
ChannelMediaResource::CacheClientNotifyDataEnded(nsresult aStatus)
{
mCallback->AbstractMainThread()->Dispatch(NS_NewRunnableFunction(
"ChannelMediaResource::CacheClientNotifyDataEnded",
[ self = RefPtr<ChannelMediaResource>(this), aStatus ]() {
if (NS_SUCCEEDED(aStatus)) {
self->mIsLiveStream = false;
}
self->mCallback->NotifyDataEnded(aStatus);
}));
}
void
ChannelMediaResource::CacheClientNotifyPrincipalChanged()
{
NS_ASSERTION(NS_IsMainThread(), "Don't call on non-main thread");
mCallback->NotifyPrincipalChanged();
}
void
ChannelMediaResource::UpdatePrincipal()
{
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(mChannel);
nsIScriptSecurityManager* secMan = nsContentUtils::GetSecurityManager();
if (!secMan) {
return;
}
nsCOMPtr<nsIPrincipal> principal;
secMan->GetChannelResultPrincipal(mChannel, getter_AddRefs(principal));
if (nsContentUtils::CombineResourcePrincipals(&mSharedInfo->mPrincipal,
principal)) {
for (auto* r : mSharedInfo->mResources) {
r->CacheClientNotifyPrincipalChanged();
}
}
}
void
ChannelMediaResource::CacheClientNotifySuspendedStatusChanged(bool aSuspended)
{
mCallback->AbstractMainThread()->Dispatch(NewRunnableMethod<bool>(
"MediaResourceCallback::NotifySuspendedStatusChanged",
mCallback.get(),
&MediaResourceCallback::NotifySuspendedStatusChanged,
aSuspended));
}
nsresult
ChannelMediaResource::Seek(int64_t aOffset, bool aResume)
{
MOZ_ASSERT(NS_IsMainThread());
if (mClosed) {
// Nothing to do when we are closed.
return NS_OK;
}
LOG("Seek requested for aOffset [%" PRId64 "]", aOffset);
CloseChannel();
if (aResume) {
mSuspendAgent.Resume();
}
// Don't create a new channel if we are still suspended. The channel will
// be recreated when we are resumed.
if (mSuspendAgent.IsSuspended()) {
return NS_OK;
}
nsresult rv = RecreateChannel();
NS_ENSURE_SUCCESS(rv, rv);
return OpenChannel(aOffset);
}
void
ChannelMediaResource::CacheClientSeek(int64_t aOffset, bool aResume)
{
RefPtr<ChannelMediaResource> self = this;
nsCOMPtr<nsIRunnable> r = NS_NewRunnableFunction(
"ChannelMediaResource::Seek", [self, aOffset, aResume]() {
nsresult rv = self->Seek(aOffset, aResume);
if (NS_FAILED(rv)) {
// Close the streams that failed due to error. This will cause all
// client Read and Seek operations on those streams to fail. Blocked
// Reads will also be woken up.
self->Close();
}
});
mCallback->AbstractMainThread()->Dispatch(r.forget());
}
void
ChannelMediaResource::CacheClientSuspend()
{
mCallback->AbstractMainThread()->Dispatch(
NewRunnableMethod<bool>("ChannelMediaResource::Suspend",
this,
&ChannelMediaResource::Suspend,
false));
}
void
ChannelMediaResource::CacheClientResume()
{
mCallback->AbstractMainThread()->Dispatch(NewRunnableMethod(
"ChannelMediaResource::Resume", this, &ChannelMediaResource::Resume));
}
int64_t
ChannelMediaResource::GetNextCachedData(int64_t aOffset)
{
return mCacheStream.GetNextCachedData(aOffset);
}
int64_t
ChannelMediaResource::GetCachedDataEnd(int64_t aOffset)
{
return mCacheStream.GetCachedDataEnd(aOffset);
}
bool
ChannelMediaResource::IsDataCachedToEndOfResource(int64_t aOffset)
{
return mCacheStream.IsDataCachedToEndOfStream(aOffset);
}
bool
ChannelMediaResource::IsSuspended()
{
return mSuspendAgent.IsSuspended();
}
void
ChannelMediaResource::SetReadMode(MediaCacheStream::ReadMode aMode)
{
mCacheStream.SetReadMode(aMode);
}
void
ChannelMediaResource::SetPlaybackRate(uint32_t aBytesPerSecond)
{
mCacheStream.SetPlaybackRate(aBytesPerSecond);
}
void
ChannelMediaResource::Pin()
{
mCacheStream.Pin();
}
void
ChannelMediaResource::Unpin()
{
mCacheStream.Unpin();
}
double
ChannelMediaResource::GetDownloadRate(bool* aIsReliable)
{
return mCacheStream.GetDownloadRate(aIsReliable);
}
int64_t
ChannelMediaResource::GetLength()
{
return mCacheStream.GetLength();
}
nsCString
ChannelMediaResource::GetDebugInfo()
{
return NS_LITERAL_CSTRING("ChannelMediaResource: ") +
mCacheStream.GetDebugInfo();
}
// ChannelSuspendAgent
bool
ChannelSuspendAgent::Suspend()
{
MOZ_ASSERT(NS_IsMainThread());
SuspendInternal();
if (++mSuspendCount == 1) {
mCacheStream.NotifyClientSuspended(true);
return true;
}
return false;
}
void
ChannelSuspendAgent::SuspendInternal()
{
MOZ_ASSERT(NS_IsMainThread());
if (mChannel) {
bool isPending = false;
nsresult rv = mChannel->IsPending(&isPending);
if (NS_SUCCEEDED(rv) && isPending && !mIsChannelSuspended) {
mChannel->Suspend();
mIsChannelSuspended = true;
}
}
}
bool
ChannelSuspendAgent::Resume()
{
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(IsSuspended(), "Resume without suspend!");
if (--mSuspendCount == 0) {
if (mChannel && mIsChannelSuspended) {
mChannel->Resume();
mIsChannelSuspended = false;
}
mCacheStream.NotifyClientSuspended(false);
return true;
}
return false;
}
void
ChannelSuspendAgent::Delegate(nsIChannel* aChannel)
{
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(aChannel);
MOZ_ASSERT(!mChannel, "The previous channel not closed.");
MOZ_ASSERT(!mIsChannelSuspended);
mChannel = aChannel;
// Ensure the suspend status of the channel matches our suspend count.
if (IsSuspended()) {
SuspendInternal();
}
}
void
ChannelSuspendAgent::Revoke()
{
MOZ_ASSERT(NS_IsMainThread());
if (!mChannel) {
// Channel already revoked. Nothing to do.
return;
}
// Before closing the channel, it needs to be resumed to make sure its internal
// state is correct. Besides, We need to suspend the channel after recreating.
if (mIsChannelSuspended) {
mChannel->Resume();
mIsChannelSuspended = false;
}
mChannel = nullptr;
}
bool
ChannelSuspendAgent::IsSuspended()
{
MOZ_ASSERT(NS_IsMainThread());
return (mSuspendCount > 0);
}
} // mozilla namespace
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