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gecko-dev/content/media/MediaResource.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et cindent: */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla code.
*
* The Initial Developer of the Original Code is the Mozilla Corporation.
* Portions created by the Initial Developer are Copyright (C) 2007
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Chris Double <chris.double@double.co.nz>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "MediaResource.h"
#include "mozilla/Mutex.h"
#include "nsDebug.h"
#include "nsMediaDecoder.h"
#include "nsNetUtil.h"
#include "nsThreadUtils.h"
#include "nsIFile.h"
#include "nsIFileChannel.h"
#include "nsIHttpChannel.h"
#include "nsISeekableStream.h"
#include "nsIInputStream.h"
#include "nsIOutputStream.h"
#include "nsIRequestObserver.h"
#include "nsIStreamListener.h"
#include "nsIScriptSecurityManager.h"
#include "nsCrossSiteListenerProxy.h"
#include "nsHTMLMediaElement.h"
#include "nsIDocument.h"
#include "nsDOMError.h"
#include "nsICachingChannel.h"
#include "nsURILoader.h"
#include "nsIAsyncVerifyRedirectCallback.h"
#include "mozilla/Util.h" // for DebugOnly
#include "nsContentUtils.h"
static const PRUint32 HTTP_OK_CODE = 200;
static const PRUint32 HTTP_PARTIAL_RESPONSE_CODE = 206;
using namespace mozilla;
ChannelMediaResource::ChannelMediaResource(nsMediaDecoder* aDecoder,
nsIChannel* aChannel, nsIURI* aURI)
: MediaResource(aDecoder, aChannel, aURI),
mOffset(0), mSuspendCount(0),
mReopenOnError(false), mIgnoreClose(false),
mCacheStream(this),
mLock("ChannelMediaResource.mLock"),
mIgnoreResume(false)
{
}
ChannelMediaResource::~ChannelMediaResource()
{
if (mListener) {
// Kill its reference to us since we're going away
mListener->Revoke();
}
}
// 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_ISUPPORTS4(ChannelMediaResource::Listener,
nsIRequestObserver, nsIStreamListener, nsIChannelEventSink,
nsIInterfaceRequestor)
nsresult
ChannelMediaResource::Listener::OnStartRequest(nsIRequest* aRequest,
nsISupports* aContext)
{
if (!mResource)
return NS_OK;
return mResource->OnStartRequest(aRequest);
}
nsresult
ChannelMediaResource::Listener::OnStopRequest(nsIRequest* aRequest,
nsISupports* aContext,
nsresult aStatus)
{
if (!mResource)
return NS_OK;
return mResource->OnStopRequest(aRequest, aStatus);
}
nsresult
ChannelMediaResource::Listener::OnDataAvailable(nsIRequest* aRequest,
nsISupports* aContext,
nsIInputStream* aStream,
PRUint32 aOffset,
PRUint32 aCount)
{
if (!mResource)
return NS_OK;
return mResource->OnDataAvailable(aRequest, aStream, aCount);
}
nsresult
ChannelMediaResource::Listener::AsyncOnChannelRedirect(nsIChannel* aOldChannel,
nsIChannel* aNewChannel,
PRUint32 aFlags,
nsIAsyncVerifyRedirectCallback* cb)
{
nsresult rv = NS_OK;
if (mResource)
rv = mResource->OnChannelRedirect(aOldChannel, aNewChannel, aFlags);
if (NS_FAILED(rv))
return rv;
cb->OnRedirectVerifyCallback(NS_OK);
return NS_OK;
}
nsresult
ChannelMediaResource::Listener::GetInterface(const nsIID & aIID, void **aResult)
{
return QueryInterface(aIID, aResult);
}
nsresult
ChannelMediaResource::OnStartRequest(nsIRequest* aRequest)
{
NS_ASSERTION(mChannel.get() == aRequest, "Wrong channel!");
nsHTMLMediaElement* element = mDecoder->GetMediaElement();
NS_ENSURE_TRUE(element, NS_ERROR_FAILURE);
nsresult status;
nsresult rv = aRequest->GetStatus(&status);
NS_ENSURE_SUCCESS(rv, rv);
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) {
mDecoder->NetworkError();
return NS_ERROR_DOM_BAD_URI;
}
}
nsCOMPtr<nsIHttpChannel> hc = do_QueryInterface(aRequest);
bool seekable = false;
if (hc) {
PRUint32 responseStatus = 0;
hc->GetResponseStatus(&responseStatus);
bool succeeded = false;
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) {
mDecoder->NetworkError();
}
// 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;
}
nsCAutoString ranges;
hc->GetResponseHeader(NS_LITERAL_CSTRING("Accept-Ranges"),
ranges);
bool acceptsRanges = ranges.EqualsLiteral("bytes");
if (mOffset == 0) {
// Look for duration headers from known Ogg content systems.
// In the case of multiple options for obtaining the duration
// the order of precedence is:
// 1) The Media resource metadata if possible (done by the decoder itself).
// 2) Content-Duration message header.
// 3) X-AMZ-Meta-Content-Duration.
// 4) X-Content-Duration.
// 5) Perform a seek in the decoder to find the value.
nsCAutoString durationText;
PRInt32 ec = 0;
rv = hc->GetResponseHeader(NS_LITERAL_CSTRING("Content-Duration"), durationText);
if (NS_FAILED(rv)) {
rv = hc->GetResponseHeader(NS_LITERAL_CSTRING("X-AMZ-Meta-Content-Duration"), durationText);
}
if (NS_FAILED(rv)) {
rv = hc->GetResponseHeader(NS_LITERAL_CSTRING("X-Content-Duration"), durationText);
}
if (NS_SUCCEEDED(rv)) {
double duration = durationText.ToDouble(&ec);
if (ec == NS_OK && duration >= 0) {
mDecoder->SetDuration(duration);
}
} else {
mDecoder->SetInfinite(true);
}
}
if (mOffset > 0 && responseStatus == HTTP_OK_CODE) {
// If we get an OK response but we were seeking, we have to assume
// that seeking doesn't work. We also need to tell the cache that
// it's getting data for the start of the stream.
mCacheStream.NotifyDataStarted(0);
mOffset = 0;
// The server claimed it supported range requests. It lied.
acceptsRanges = false;
} else if (mOffset == 0 &&
(responseStatus == HTTP_OK_CODE ||
responseStatus == HTTP_PARTIAL_RESPONSE_CODE)) {
// We weren't seeking and got a valid response status,
// set the length of the content.
PRInt32 cl = -1;
hc->GetContentLength(&cl);
if (cl >= 0) {
mCacheStream.NotifyDataLength(cl);
}
}
// 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.
seekable =
responseStatus == HTTP_PARTIAL_RESPONSE_CODE || acceptsRanges;
if (seekable) {
mDecoder->SetInfinite(false);
}
}
mDecoder->SetSeekable(seekable);
mCacheStream.SetSeekable(seekable);
nsCOMPtr<nsICachingChannel> cc = do_QueryInterface(aRequest);
if (cc) {
bool fromCache = false;
rv = cc->IsFromCache(&fromCache);
if (NS_SUCCEEDED(rv) && !fromCache) {
cc->SetCacheAsFile(true);
}
}
{
MutexAutoLock lock(mLock);
mChannelStatistics.Start(TimeStamp::Now());
}
mReopenOnError = false;
mIgnoreClose = false;
if (mSuspendCount > 0) {
// Re-suspend the channel if it needs to be suspended
// No need to call PossiblySuspend here since the channel is
// definitely in the right state for us in OnStartRequest.
mChannel->Suspend();
mIgnoreResume = false;
}
// Fires an initial progress event and sets up the stall counter so stall events
// fire if no download occurs within the required time frame.
mDecoder->Progress(false);
return NS_OK;
}
nsresult
ChannelMediaResource::OnStopRequest(nsIRequest* aRequest, nsresult aStatus)
{
NS_ASSERTION(mChannel.get() == aRequest, "Wrong channel!");
NS_ASSERTION(mSuspendCount == 0,
"How can OnStopRequest fire while we're suspended?");
{
MutexAutoLock lock(mLock);
mChannelStatistics.Stop(TimeStamp::Now());
}
// Note that aStatus might have succeeded --- this might be a normal close
// --- even in situations where the server cut us off because we were
// suspended. So we need to "reopen on error" in that case too. The only
// cases where we don't need to reopen are when *we* closed the stream.
// But don't reopen if we need to seek and we don't think we can... that would
// cause us to just re-read the stream, which would be really bad.
if (mReopenOnError &&
aStatus != NS_ERROR_PARSED_DATA_CACHED && aStatus != NS_BINDING_ABORTED &&
(mOffset == 0 || mCacheStream.IsSeekable())) {
// If the stream did close normally, then if the server is seekable we'll
// just seek to the end of the resource and get an HTTP 416 error because
// there's nothing there, so this isn't bad.
nsresult rv = CacheClientSeek(mOffset, false);
if (NS_SUCCEEDED(rv))
return rv;
// If the reopen/reseek fails, just fall through and treat this
// error as fatal.
}
if (!mIgnoreClose) {
mCacheStream.NotifyDataEnded(aStatus);
// 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);
}
}
return NS_OK;
}
nsresult
ChannelMediaResource::OnChannelRedirect(nsIChannel* aOld, nsIChannel* aNew,
PRUint32 aFlags)
{
mChannel = aNew;
SetupChannelHeaders();
return NS_OK;
}
struct CopySegmentClosure {
nsCOMPtr<nsIPrincipal> mPrincipal;
ChannelMediaResource* mResource;
};
NS_METHOD
ChannelMediaResource::CopySegmentToCache(nsIInputStream *aInStream,
void *aClosure,
const char *aFromSegment,
PRUint32 aToOffset,
PRUint32 aCount,
PRUint32 *aWriteCount)
{
CopySegmentClosure* closure = static_cast<CopySegmentClosure*>(aClosure);
closure->mResource->mDecoder->NotifyDataArrived(aFromSegment, aCount, closure->mResource->mOffset);
// Keep track of where we're up to
closure->mResource->mOffset += aCount;
closure->mResource->mCacheStream.NotifyDataReceived(aCount, aFromSegment,
closure->mPrincipal);
*aWriteCount = aCount;
return NS_OK;
}
nsresult
ChannelMediaResource::OnDataAvailable(nsIRequest* aRequest,
nsIInputStream* aStream,
PRUint32 aCount)
{
NS_ASSERTION(mChannel.get() == aRequest, "Wrong channel!");
{
MutexAutoLock lock(mLock);
mChannelStatistics.AddBytes(aCount);
}
CopySegmentClosure closure;
nsIScriptSecurityManager* secMan = nsContentUtils::GetSecurityManager();
if (secMan && mChannel) {
secMan->GetChannelPrincipal(mChannel, getter_AddRefs(closure.mPrincipal));
}
closure.mResource = this;
PRUint32 count = aCount;
while (count > 0) {
PRUint32 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");
nsresult rv = mCacheStream.Init();
if (NS_FAILED(rv))
return rv;
NS_ASSERTION(mOffset == 0, "Who set mOffset already?");
if (!mChannel) {
// When we're a clone, the decoder might ask us to Open even though
// we haven't established an mChannel (because we might not need one)
NS_ASSERTION(!aStreamListener,
"Should have already been given a channel if we're to return a stream listener");
return NS_OK;
}
return OpenChannel(aStreamListener);
}
nsresult ChannelMediaResource::OpenChannel(nsIStreamListener** aStreamListener)
{
NS_ASSERTION(NS_IsMainThread(), "Only call on main thread");
NS_ENSURE_TRUE(mChannel, NS_ERROR_NULL_POINTER);
NS_ASSERTION(!mListener, "Listener should have been removed by now");
if (aStreamListener) {
*aStreamListener = nsnull;
}
mListener = new Listener(this);
NS_ENSURE_TRUE(mListener, NS_ERROR_OUT_OF_MEMORY);
if (aStreamListener) {
*aStreamListener = mListener;
NS_ADDREF(*aStreamListener);
} else {
mChannel->SetNotificationCallbacks(mListener.get());
nsCOMPtr<nsIStreamListener> listener = mListener.get();
// Ensure that if we're loading cross domain, that the server is sending
// an authorizing Access-Control header.
nsHTMLMediaElement* element = mDecoder->GetMediaElement();
NS_ENSURE_TRUE(element, NS_ERROR_FAILURE);
if (element->ShouldCheckAllowOrigin()) {
nsresult rv;
nsCORSListenerProxy* crossSiteListener =
new nsCORSListenerProxy(mListener,
element->NodePrincipal(),
mChannel,
false,
&rv);
listener = crossSiteListener;
NS_ENSURE_TRUE(crossSiteListener, NS_ERROR_OUT_OF_MEMORY);
NS_ENSURE_SUCCESS(rv, rv);
} else {
nsresult rv = nsContentUtils::GetSecurityManager()->
CheckLoadURIWithPrincipal(element->NodePrincipal(),
mURI,
nsIScriptSecurityManager::STANDARD);
NS_ENSURE_SUCCESS(rv, rv);
}
SetupChannelHeaders();
nsresult rv = mChannel->AsyncOpen(listener, nsnull);
NS_ENSURE_SUCCESS(rv, rv);
}
return NS_OK;
}
void ChannelMediaResource::SetupChannelHeaders()
{
// 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) {
nsCAutoString rangeString("bytes=");
rangeString.AppendInt(mOffset);
rangeString.Append("-");
hc->SetRequestHeader(NS_LITERAL_CSTRING("Range"), rangeString, false);
// Send Accept header for video and audio types only (Bug 489071)
NS_ASSERTION(NS_IsMainThread(), "Don't call on non-main thread");
nsHTMLMediaElement* element = mDecoder->GetMediaElement();
if (!element) {
return;
}
element->SetRequestHeaders(hc);
} else {
NS_ASSERTION(mOffset == 0, "Don't know how to seek on this channel type");
}
}
nsresult ChannelMediaResource::Close()
{
NS_ASSERTION(NS_IsMainThread(), "Only call on main thread");
mCacheStream.Close();
CloseChannel();
return NS_OK;
}
already_AddRefed<nsIPrincipal> ChannelMediaResource::GetCurrentPrincipal()
{
NS_ASSERTION(NS_IsMainThread(), "Only call on main thread");
nsCOMPtr<nsIPrincipal> principal = mCacheStream.GetCurrentPrincipal();
return principal.forget();
}
bool ChannelMediaResource::CanClone()
{
return mCacheStream.IsAvailableForSharing();
}
MediaResource* ChannelMediaResource::CloneData(nsMediaDecoder* aDecoder)
{
NS_ASSERTION(NS_IsMainThread(), "Only call on main thread");
NS_ASSERTION(mCacheStream.IsAvailableForSharing(), "Stream can't be cloned");
ChannelMediaResource* resource = new ChannelMediaResource(aDecoder, nsnull, mURI);
if (resource) {
// 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 unneccesary HTTP channel
// and perform a useless HTTP transaction.
resource->mSuspendCount = 1;
resource->mCacheStream.InitAsClone(&mCacheStream);
resource->mChannelStatistics = mChannelStatistics;
resource->mChannelStatistics.Stop(TimeStamp::Now());
}
return resource;
}
void ChannelMediaResource::CloseChannel()
{
NS_ASSERTION(NS_IsMainThread(), "Only call on main thread");
{
MutexAutoLock lock(mLock);
mChannelStatistics.Stop(TimeStamp::Now());
}
if (mListener) {
mListener->Revoke();
mListener = nsnull;
}
if (mChannel) {
if (mSuspendCount > 0) {
// Resume the channel before we cancel it
PossiblyResume();
}
// 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 DocumentViewerImpl::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 = nsnull;
}
}
nsresult ChannelMediaResource::ReadFromCache(char* aBuffer,
PRInt64 aOffset,
PRUint32 aCount)
{
return mCacheStream.ReadFromCache(aBuffer, aOffset, aCount);
}
nsresult ChannelMediaResource::Read(char* aBuffer,
PRUint32 aCount,
PRUint32* aBytes)
{
NS_ASSERTION(!NS_IsMainThread(), "Don't call on main thread");
return mCacheStream.Read(aBuffer, aCount, aBytes);
}
nsresult ChannelMediaResource::Seek(PRInt32 aWhence, PRInt64 aOffset)
{
NS_ASSERTION(!NS_IsMainThread(), "Don't call on main thread");
return mCacheStream.Seek(aWhence, aOffset);
}
PRInt64 ChannelMediaResource::Tell()
{
NS_ASSERTION(!NS_IsMainThread(), "Don't call on main thread");
return mCacheStream.Tell();
}
nsresult ChannelMediaResource::GetCachedRanges(nsTArray<MediaByteRange>& aRanges)
{
return mCacheStream.GetCachedRanges(aRanges);
}
void ChannelMediaResource::Suspend(bool aCloseImmediately)
{
NS_ASSERTION(NS_IsMainThread(), "Don't call on non-main thread");
nsHTMLMediaElement* element = mDecoder->GetMediaElement();
if (!element) {
// Shutting down; do nothing.
return;
}
if (mChannel) {
if (aCloseImmediately && mCacheStream.IsSeekable()) {
// Kill off our channel right now, but don't tell anyone about it.
mIgnoreClose = true;
CloseChannel();
element->DownloadSuspended();
} else if (mSuspendCount == 0) {
{
MutexAutoLock lock(mLock);
mChannelStatistics.Stop(TimeStamp::Now());
}
PossiblySuspend();
element->DownloadSuspended();
}
}
++mSuspendCount;
}
void ChannelMediaResource::Resume()
{
NS_ASSERTION(NS_IsMainThread(), "Don't call on non-main thread");
NS_ASSERTION(mSuspendCount > 0, "Too many resumes!");
nsHTMLMediaElement* element = mDecoder->GetMediaElement();
if (!element) {
// Shutting down; do nothing.
return;
}
NS_ASSERTION(mSuspendCount > 0, "Resume without previous Suspend!");
--mSuspendCount;
if (mSuspendCount == 0) {
if (mChannel) {
// Just wake up our existing channel
{
MutexAutoLock lock(mLock);
mChannelStatistics.Start(TimeStamp::Now());
}
// if an error occurs after Resume, assume it's because the server
// timed out the connection and we should reopen it.
mReopenOnError = true;
PossiblyResume();
element->DownloadResumed();
} else {
PRInt64 totalLength = mCacheStream.GetLength();
// If mOffset is at the end of the stream, then we shouldn't try to
// seek to it. The seek will fail and be wasted anyway. We can leave
// the channel dead; if the media cache wants to read some other data
// in the future, it will call CacheClientSeek itself which will reopen the
// channel.
if (totalLength < 0 || mOffset < totalLength) {
// There is (or may be) data to read at mOffset, so start reading it.
// Need to recreate the channel.
CacheClientSeek(mOffset, false);
}
element->DownloadResumed();
}
}
}
nsresult
ChannelMediaResource::RecreateChannel()
{
nsLoadFlags loadFlags =
nsICachingChannel::LOAD_BYPASS_LOCAL_CACHE_IF_BUSY |
(mLoadInBackground ? nsIRequest::LOAD_BACKGROUND : 0);
nsHTMLMediaElement* element = mDecoder->GetMediaElement();
if (!element) {
// The decoder is being shut down, so don't bother opening a new channel
return NS_OK;
}
nsCOMPtr<nsILoadGroup> loadGroup = element->GetDocumentLoadGroup();
NS_ENSURE_TRUE(loadGroup, NS_ERROR_NULL_POINTER);
return NS_NewChannel(getter_AddRefs(mChannel),
mURI,
nsnull,
loadGroup,
nsnull,
loadFlags);
}
void
ChannelMediaResource::DoNotifyDataReceived()
{
mDataReceivedEvent.Revoke();
mDecoder->NotifyBytesDownloaded();
}
void
ChannelMediaResource::CacheClientNotifyDataReceived()
{
NS_ASSERTION(NS_IsMainThread(), "Don't call on non-main thread");
// NOTE: this can be called with the media cache lock held, so don't
// block or do anything which might try to acquire a lock!
if (mDataReceivedEvent.IsPending())
return;
mDataReceivedEvent =
NS_NewNonOwningRunnableMethod(this, &ChannelMediaResource::DoNotifyDataReceived);
NS_DispatchToMainThread(mDataReceivedEvent.get(), NS_DISPATCH_NORMAL);
}
class DataEnded : public nsRunnable {
public:
DataEnded(nsMediaDecoder* aDecoder, nsresult aStatus) :
mDecoder(aDecoder), mStatus(aStatus) {}
NS_IMETHOD Run() {
mDecoder->NotifyDownloadEnded(mStatus);
return NS_OK;
}
private:
nsRefPtr<nsMediaDecoder> mDecoder;
nsresult mStatus;
};
void
ChannelMediaResource::CacheClientNotifyDataEnded(nsresult aStatus)
{
NS_ASSERTION(NS_IsMainThread(), "Don't call on non-main thread");
// NOTE: this can be called with the media cache lock held, so don't
// block or do anything which might try to acquire a lock!
nsCOMPtr<nsIRunnable> event = new DataEnded(mDecoder, aStatus);
NS_DispatchToMainThread(event, NS_DISPATCH_NORMAL);
}
nsresult
ChannelMediaResource::CacheClientSeek(PRInt64 aOffset, bool aResume)
{
NS_ASSERTION(NS_IsMainThread(), "Don't call on non-main thread");
CloseChannel();
if (aResume) {
NS_ASSERTION(mSuspendCount > 0, "Too many resumes!");
// No need to mess with the channel, since we're making a new one
--mSuspendCount;
}
nsresult rv = RecreateChannel();
if (NS_FAILED(rv))
return rv;
mOffset = aOffset;
return OpenChannel(nsnull);
}
nsresult
ChannelMediaResource::CacheClientSuspend()
{
Suspend(false);
mDecoder->NotifySuspendedStatusChanged();
return NS_OK;
}
nsresult
ChannelMediaResource::CacheClientResume()
{
Resume();
mDecoder->NotifySuspendedStatusChanged();
return NS_OK;
}
PRInt64
ChannelMediaResource::GetNextCachedData(PRInt64 aOffset)
{
return mCacheStream.GetNextCachedData(aOffset);
}
PRInt64
ChannelMediaResource::GetCachedDataEnd(PRInt64 aOffset)
{
return mCacheStream.GetCachedDataEnd(aOffset);
}
bool
ChannelMediaResource::IsDataCachedToEndOfResource(PRInt64 aOffset)
{
return mCacheStream.IsDataCachedToEndOfStream(aOffset);
}
void
ChannelMediaResource::EnsureCacheUpToDate()
{
mCacheStream.EnsureCacheUpdate();
}
bool
ChannelMediaResource::IsSuspendedByCache(MediaResource** aActiveResource)
{
return mCacheStream.AreAllStreamsForResourceSuspended(aActiveResource);
}
bool
ChannelMediaResource::IsSuspended()
{
MutexAutoLock lock(mLock);
return mSuspendCount > 0;
}
void
ChannelMediaResource::SetReadMode(nsMediaCacheStream::ReadMode aMode)
{
mCacheStream.SetReadMode(aMode);
}
void
ChannelMediaResource::SetPlaybackRate(PRUint32 aBytesPerSecond)
{
mCacheStream.SetPlaybackRate(aBytesPerSecond);
}
void
ChannelMediaResource::Pin()
{
mCacheStream.Pin();
}
void
ChannelMediaResource::Unpin()
{
mCacheStream.Unpin();
}
double
ChannelMediaResource::GetDownloadRate(bool* aIsReliable)
{
MutexAutoLock lock(mLock);
return mChannelStatistics.GetRate(TimeStamp::Now(), aIsReliable);
}
PRInt64
ChannelMediaResource::GetLength()
{
return mCacheStream.GetLength();
}
void
ChannelMediaResource::PossiblySuspend()
{
bool isPending = false;
nsresult rv = mChannel->IsPending(&isPending);
if (NS_SUCCEEDED(rv) && isPending) {
mChannel->Suspend();
mIgnoreResume = false;
} else {
mIgnoreResume = true;
}
}
void
ChannelMediaResource::PossiblyResume()
{
if (!mIgnoreResume) {
mChannel->Resume();
} else {
mIgnoreResume = false;
}
}
class FileMediaResource : public MediaResource
{
public:
FileMediaResource(nsMediaDecoder* aDecoder, nsIChannel* aChannel, nsIURI* aURI) :
MediaResource(aDecoder, aChannel, aURI), mSize(-1),
mLock("FileMediaResource.mLock")
{
}
~FileMediaResource()
{
}
// Main thread
virtual nsresult Open(nsIStreamListener** aStreamListener);
virtual nsresult Close();
virtual void Suspend(bool aCloseImmediately) {}
virtual void Resume() {}
virtual already_AddRefed<nsIPrincipal> GetCurrentPrincipal();
virtual bool CanClone();
virtual MediaResource* CloneData(nsMediaDecoder* aDecoder);
virtual nsresult ReadFromCache(char* aBuffer, PRInt64 aOffset, PRUint32 aCount);
// These methods are called off the main thread.
// Other thread
virtual void SetReadMode(nsMediaCacheStream::ReadMode aMode) {}
virtual void SetPlaybackRate(PRUint32 aBytesPerSecond) {}
virtual nsresult Read(char* aBuffer, PRUint32 aCount, PRUint32* aBytes);
virtual nsresult Seek(PRInt32 aWhence, PRInt64 aOffset);
virtual PRInt64 Tell();
// Any thread
virtual void Pin() {}
virtual void Unpin() {}
virtual double GetDownloadRate(bool* aIsReliable)
{
// The data's all already here
*aIsReliable = true;
return 100*1024*1024; // arbitray, use 100MB/s
}
virtual PRInt64 GetLength() { return mSize; }
virtual PRInt64 GetNextCachedData(PRInt64 aOffset)
{
return (aOffset < mSize) ? aOffset : -1;
}
virtual PRInt64 GetCachedDataEnd(PRInt64 aOffset) { return NS_MAX(aOffset, mSize); }
virtual bool IsDataCachedToEndOfResource(PRInt64 aOffset) { return true; }
virtual bool IsSuspendedByCache(MediaResource** aActiveResource)
{
if (aActiveResource) {
*aActiveResource = nsnull;
}
return false;
}
virtual bool IsSuspended() { return false; }
nsresult GetCachedRanges(nsTArray<MediaByteRange>& aRanges);
private:
// The file size, or -1 if not known. Immutable after Open().
PRInt64 mSize;
// This lock handles synchronisation between calls to Close() and
// the Read, Seek, etc calls. Close must not be called while a
// Read or Seek is in progress since it resets various internal
// values to null.
// This lock protects mSeekable and mInput.
Mutex mLock;
// Seekable stream interface to file. This can be used from any
// thread.
nsCOMPtr<nsISeekableStream> mSeekable;
// Input stream for the media data. This can be used from any
// thread.
nsCOMPtr<nsIInputStream> mInput;
};
class LoadedEvent : public nsRunnable
{
public:
LoadedEvent(nsMediaDecoder* aDecoder) :
mDecoder(aDecoder)
{
MOZ_COUNT_CTOR(LoadedEvent);
}
~LoadedEvent()
{
MOZ_COUNT_DTOR(LoadedEvent);
}
NS_IMETHOD Run() {
mDecoder->NotifyDownloadEnded(NS_OK);
return NS_OK;
}
private:
nsRefPtr<nsMediaDecoder> mDecoder;
};
nsresult FileMediaResource::GetCachedRanges(nsTArray<MediaByteRange>& aRanges)
{
if (mSize == -1) {
return NS_ERROR_FAILURE;
}
aRanges.AppendElement(MediaByteRange(0, mSize));
return NS_OK;
}
nsresult FileMediaResource::Open(nsIStreamListener** aStreamListener)
{
NS_ASSERTION(NS_IsMainThread(), "Only call on main thread");
if (aStreamListener) {
*aStreamListener = nsnull;
}
nsresult rv = NS_OK;
if (aStreamListener) {
// The channel is already open. We need a synchronous stream that
// implements nsISeekableStream, so we have to find the underlying
// file and reopen it
nsCOMPtr<nsIFileChannel> fc(do_QueryInterface(mChannel));
if (!fc)
return NS_ERROR_UNEXPECTED;
nsCOMPtr<nsIFile> file;
rv = fc->GetFile(getter_AddRefs(file));
NS_ENSURE_SUCCESS(rv, rv);
rv = NS_NewLocalFileInputStream(getter_AddRefs(mInput), file);
} else {
// Ensure that we never load a local file from some page on a
// web server.
nsHTMLMediaElement* element = mDecoder->GetMediaElement();
NS_ENSURE_TRUE(element, NS_ERROR_FAILURE);
rv = nsContentUtils::GetSecurityManager()->
CheckLoadURIWithPrincipal(element->NodePrincipal(),
mURI,
nsIScriptSecurityManager::STANDARD);
NS_ENSURE_SUCCESS(rv, rv);
rv = mChannel->Open(getter_AddRefs(mInput));
}
NS_ENSURE_SUCCESS(rv, rv);
mSeekable = do_QueryInterface(mInput);
if (!mSeekable) {
// XXX The file may just be a .url or similar
// shortcut that points to a Web site. We need to fix this by
// doing an async open and waiting until we locate the real resource,
// then using that (if it's still a file!).
return NS_ERROR_FAILURE;
}
// Get the file size and inform the decoder. Only files up to 4GB are
// supported here.
PRUint32 size;
rv = mInput->Available(&size);
if (NS_SUCCEEDED(rv)) {
mSize = size;
}
nsCOMPtr<nsIRunnable> event = new LoadedEvent(mDecoder);
NS_DispatchToMainThread(event, NS_DISPATCH_NORMAL);
return NS_OK;
}
nsresult FileMediaResource::Close()
{
NS_ASSERTION(NS_IsMainThread(), "Only call on main thread");
MutexAutoLock lock(mLock);
if (mChannel) {
mChannel->Cancel(NS_ERROR_PARSED_DATA_CACHED);
mChannel = nsnull;
mInput = nsnull;
mSeekable = nsnull;
}
return NS_OK;
}
already_AddRefed<nsIPrincipal> FileMediaResource::GetCurrentPrincipal()
{
NS_ASSERTION(NS_IsMainThread(), "Only call on main thread");
nsCOMPtr<nsIPrincipal> principal;
nsIScriptSecurityManager* secMan = nsContentUtils::GetSecurityManager();
if (!secMan || !mChannel)
return nsnull;
secMan->GetChannelPrincipal(mChannel, getter_AddRefs(principal));
return principal.forget();
}
bool FileMediaResource::CanClone()
{
return true;
}
MediaResource* FileMediaResource::CloneData(nsMediaDecoder* aDecoder)
{
NS_ASSERTION(NS_IsMainThread(), "Only call on main thread");
nsHTMLMediaElement* element = aDecoder->GetMediaElement();
if (!element) {
// The decoder is being shut down, so we can't clone
return nsnull;
}
nsCOMPtr<nsILoadGroup> loadGroup = element->GetDocumentLoadGroup();
NS_ENSURE_TRUE(loadGroup, nsnull);
nsCOMPtr<nsIChannel> channel;
nsresult rv =
NS_NewChannel(getter_AddRefs(channel), mURI, nsnull, loadGroup, nsnull, 0);
if (NS_FAILED(rv))
return nsnull;
return new FileMediaResource(aDecoder, channel, mURI);
}
nsresult FileMediaResource::ReadFromCache(char* aBuffer, PRInt64 aOffset, PRUint32 aCount)
{
MutexAutoLock lock(mLock);
if (!mInput || !mSeekable)
return NS_ERROR_FAILURE;
PRInt64 offset = 0;
nsresult res = mSeekable->Tell(&offset);
NS_ENSURE_SUCCESS(res,res);
res = mSeekable->Seek(nsISeekableStream::NS_SEEK_SET, aOffset);
NS_ENSURE_SUCCESS(res,res);
PRUint32 bytesRead = 0;
do {
PRUint32 x = 0;
PRUint32 bytesToRead = aCount - bytesRead;
res = mInput->Read(aBuffer, bytesToRead, &x);
bytesRead += x;
} while (bytesRead != aCount && res == NS_OK);
// Reset read head to original position so we don't disturb any other
// reading thread.
nsresult seekres = mSeekable->Seek(nsISeekableStream::NS_SEEK_SET, offset);
// If a read failed in the loop above, we want to return its failure code.
NS_ENSURE_SUCCESS(res,res);
// Else we succeed if the reset-seek succeeds.
return seekres;
}
nsresult FileMediaResource::Read(char* aBuffer, PRUint32 aCount, PRUint32* aBytes)
{
MutexAutoLock lock(mLock);
if (!mInput)
return NS_ERROR_FAILURE;
return mInput->Read(aBuffer, aCount, aBytes);
}
nsresult FileMediaResource::Seek(PRInt32 aWhence, PRInt64 aOffset)
{
NS_ASSERTION(!NS_IsMainThread(), "Don't call on main thread");
MutexAutoLock lock(mLock);
if (!mSeekable)
return NS_ERROR_FAILURE;
return mSeekable->Seek(aWhence, aOffset);
}
PRInt64 FileMediaResource::Tell()
{
NS_ASSERTION(!NS_IsMainThread(), "Don't call on main thread");
MutexAutoLock lock(mLock);
if (!mSeekable)
return 0;
PRInt64 offset = 0;
mSeekable->Tell(&offset);
return offset;
}
MediaResource*
MediaResource::Create(nsMediaDecoder* aDecoder, nsIChannel* aChannel)
{
NS_ASSERTION(NS_IsMainThread(),
"MediaResource::Open called on non-main thread");
// If the channel was redirected, we want the post-redirect URI;
// but if the URI scheme was expanded, say from chrome: to jar:file:,
// we want the original URI.
nsCOMPtr<nsIURI> uri;
nsresult rv = NS_GetFinalChannelURI(aChannel, getter_AddRefs(uri));
NS_ENSURE_SUCCESS(rv, nsnull);
nsCOMPtr<nsIFileChannel> fc = do_QueryInterface(aChannel);
if (fc) {
return new FileMediaResource(aDecoder, aChannel, uri);
}
return new ChannelMediaResource(aDecoder, aChannel, uri);
}
void MediaResource::MoveLoadsToBackground() {
NS_ASSERTION(!mLoadInBackground, "Why are you calling this more than once?");
mLoadInBackground = true;
if (!mChannel) {
// No channel, resource is probably already loaded.
return;
}
nsHTMLMediaElement* element = mDecoder->GetMediaElement();
if (!element) {
NS_WARNING("Null element in MediaResource::MoveLoadsToBackground()");
return;
}
bool isPending = false;
if (NS_SUCCEEDED(mChannel->IsPending(&isPending)) &&
isPending) {
nsLoadFlags loadFlags;
DebugOnly<nsresult> rv = mChannel->GetLoadFlags(&loadFlags);
NS_ASSERTION(NS_SUCCEEDED(rv), "GetLoadFlags() failed!");
loadFlags |= nsIRequest::LOAD_BACKGROUND;
ModifyLoadFlags(loadFlags);
}
}
void MediaResource::ModifyLoadFlags(nsLoadFlags aFlags)
{
nsCOMPtr<nsILoadGroup> loadGroup;
DebugOnly<nsresult> rv = mChannel->GetLoadGroup(getter_AddRefs(loadGroup));
NS_ASSERTION(NS_SUCCEEDED(rv), "GetLoadGroup() failed!");
nsresult status;
mChannel->GetStatus(&status);
// Note: if (NS_FAILED(status)), the channel won't be in the load group.
if (loadGroup &&
NS_SUCCEEDED(status)) {
rv = loadGroup->RemoveRequest(mChannel, nsnull, status);
NS_ASSERTION(NS_SUCCEEDED(rv), "RemoveRequest() failed!");
}
rv = mChannel->SetLoadFlags(aFlags);
NS_ASSERTION(NS_SUCCEEDED(rv), "SetLoadFlags() failed!");
if (loadGroup &&
NS_SUCCEEDED(status)) {
rv = loadGroup->AddRequest(mChannel, nsnull);
NS_ASSERTION(NS_SUCCEEDED(rv), "AddRequest() failed!");
}
}
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