The Tor Browser: content/media/MediaResource.cpp@44a2da4a2ab2

Replace accessor implementation with direct member state manipulation, by
request https://trac.torproject.org/projects/tor/ticket/9701#comment:32

     1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

     2 /* vim:set ts=2 sw=2 sts=2 et cindent: */

     3 /* This Source Code Form is subject to the terms of the Mozilla Public

     4  * License, v. 2.0. If a copy of the MPL was not distributed with this

     5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     7 #include "mozilla/DebugOnly.h"

     9 #include "MediaResource.h"

    10 #include "RtspMediaResource.h"

    12 #include "mozilla/Mutex.h"

    13 #include "nsDebug.h"

    14 #include "MediaDecoder.h"

    15 #include "nsNetUtil.h"

    16 #include "nsThreadUtils.h"

    17 #include "nsIFile.h"

    18 #include "nsIFileChannel.h"

    19 #include "nsIHttpChannel.h"

    20 #include "nsISeekableStream.h"

    21 #include "nsIInputStream.h"

    22 #include "nsIRequestObserver.h"

    23 #include "nsIStreamListener.h"

    24 #include "nsIScriptSecurityManager.h"

    25 #include "nsCrossSiteListenerProxy.h"

    26 #include "mozilla/dom/HTMLMediaElement.h"

    27 #include "nsError.h"

    28 #include "nsICachingChannel.h"

    29 #include "nsIAsyncVerifyRedirectCallback.h"

    30 #include "nsContentUtils.h"

    31 #include "nsHostObjectProtocolHandler.h"

    32 #include <algorithm>

    33 #include "nsProxyRelease.h"

    35 #ifdef PR_LOGGING

    36 PRLogModuleInfo* gMediaResourceLog;

    37 #define RESOURCE_LOG(msg, ...) PR_LOG(gMediaResourceLog, PR_LOG_DEBUG, \

    38                                       (msg, ##__VA_ARGS__))

    39 // Debug logging macro with object pointer and class name.

    40 #define CMLOG(msg, ...) \

    41         RESOURCE_LOG("%p [ChannelMediaResource]: " msg, this, ##__VA_ARGS__)

    42 #else

    43 #define RESOURCE_LOG(msg, ...)

    44 #define CMLOG(msg, ...)

    45 #endif

    47 static const uint32_t HTTP_OK_CODE = 200;

    48 static const uint32_t HTTP_PARTIAL_RESPONSE_CODE = 206;

    50 namespace mozilla {

    52 void

    53 MediaResource::Destroy()

    54 {

    55   // If we're being destroyed on a non-main thread, we AddRef again and

    56   // use a proxy to release the MediaResource on the main thread, where

    57   // the MediaResource is deleted. This ensures we only delete the

    58   // MediaResource on the main thread.

    59   if (!NS_IsMainThread()) {

    60     nsCOMPtr<nsIThread> mainThread = do_GetMainThread();

    61     NS_ENSURE_TRUE_VOID(mainThread);

    62     nsRefPtr<MediaResource> doomed(this);

    63     if (NS_FAILED(NS_ProxyRelease(mainThread, doomed, true))) {

    64       NS_WARNING("Failed to proxy release to main thread!");

    65     }

    66   } else {

    67     delete this;

    68   }

    69 }

    71 NS_IMPL_ADDREF(MediaResource)

    72 NS_IMPL_RELEASE_WITH_DESTROY(MediaResource, Destroy())

    73 NS_IMPL_QUERY_INTERFACE0(MediaResource)

    75 ChannelMediaResource::ChannelMediaResource(MediaDecoder* aDecoder,

    76                                            nsIChannel* aChannel,

    77                                            nsIURI* aURI,

    78                                            const nsACString& aContentType)

    79   : BaseMediaResource(aDecoder, aChannel, aURI, aContentType),

    80     mOffset(0), mSuspendCount(0),

    81     mReopenOnError(false), mIgnoreClose(false),

    82     mCacheStream(MOZ_THIS_IN_INITIALIZER_LIST()),

    83     mLock("ChannelMediaResource.mLock"),

    84     mIgnoreResume(false),

    85     mSeekingForMetadata(false),

    86     mIsTransportSeekable(true)

    87 {

    88 #ifdef PR_LOGGING

    89   if (!gMediaResourceLog) {

    90     gMediaResourceLog = PR_NewLogModule("MediaResource");

    91   }

    92 #endif

    93 }

    95 ChannelMediaResource::~ChannelMediaResource()

    96 {

    97   if (mListener) {

    98     // Kill its reference to us since we're going away

    99     mListener->Revoke();

   100   }

   101 }

   103 // ChannelMediaResource::Listener just observes the channel and

   104 // forwards notifications to the ChannelMediaResource. We use multiple

   105 // listener objects so that when we open a new stream for a seek we can

   106 // disconnect the old listener from the ChannelMediaResource and hook up

   107 // a new listener, so notifications from the old channel are discarded

   108 // and don't confuse us.

   109 NS_IMPL_ISUPPORTS(ChannelMediaResource::Listener,

   110                   nsIRequestObserver, nsIStreamListener, nsIChannelEventSink,

   111                   nsIInterfaceRequestor)

   113 nsresult

   114 ChannelMediaResource::Listener::OnStartRequest(nsIRequest* aRequest,

   115                                                nsISupports* aContext)

   116 {

   117   if (!mResource)

   118     return NS_OK;

   119   return mResource->OnStartRequest(aRequest);

   120 }

   122 nsresult

   123 ChannelMediaResource::Listener::OnStopRequest(nsIRequest* aRequest,

   124                                               nsISupports* aContext,

   125                                               nsresult aStatus)

   126 {

   127   if (!mResource)

   128     return NS_OK;

   129   return mResource->OnStopRequest(aRequest, aStatus);

   130 }

   132 nsresult

   133 ChannelMediaResource::Listener::OnDataAvailable(nsIRequest* aRequest,

   134                                                 nsISupports* aContext,

   135                                                 nsIInputStream* aStream,

   136                                                 uint64_t aOffset,

   137                                                 uint32_t aCount)

   138 {

   139   if (!mResource)

   140     return NS_OK;

   141   return mResource->OnDataAvailable(aRequest, aStream, aCount);

   142 }

   144 nsresult

   145 ChannelMediaResource::Listener::AsyncOnChannelRedirect(nsIChannel* aOldChannel,

   146                                                        nsIChannel* aNewChannel,

   147                                                        uint32_t aFlags,

   148                                                        nsIAsyncVerifyRedirectCallback* cb)

   149 {

   150   nsresult rv = NS_OK;

   151   if (mResource)

   152     rv = mResource->OnChannelRedirect(aOldChannel, aNewChannel, aFlags);

   154   if (NS_FAILED(rv))

   155     return rv;

   157   cb->OnRedirectVerifyCallback(NS_OK);

   158   return NS_OK;

   159 }

   161 nsresult

   162 ChannelMediaResource::Listener::GetInterface(const nsIID & aIID, void **aResult)

   163 {

   164   return QueryInterface(aIID, aResult);

   165 }

   167 nsresult

   168 ChannelMediaResource::OnStartRequest(nsIRequest* aRequest)

   169 {

   170   NS_ASSERTION(mChannel.get() == aRequest, "Wrong channel!");

   172   MediaDecoderOwner* owner = mDecoder->GetMediaOwner();

   173   NS_ENSURE_TRUE(owner, NS_ERROR_FAILURE);

   174   dom::HTMLMediaElement* element = owner->GetMediaElement();

   175   NS_ENSURE_TRUE(element, NS_ERROR_FAILURE);

   176   nsresult status;

   177   nsresult rv = aRequest->GetStatus(&status);

   178   NS_ENSURE_SUCCESS(rv, rv);

   180   if (status == NS_BINDING_ABORTED) {

   181     // Request was aborted before we had a chance to receive any data, or

   182     // even an OnStartRequest(). Close the channel. This is important, as

   183     // we don't want to mess up our state, as if we're cloned that would

   184     // cause the clone to copy incorrect metadata (like whether we're

   185     // infinite for example).

   186     CloseChannel();

   187     return status;

   188   }

   190   if (element->ShouldCheckAllowOrigin()) {

   191     // If the request was cancelled by nsCORSListenerProxy due to failing

   192     // the CORS security check, send an error through to the media element.

   193     if (status == NS_ERROR_DOM_BAD_URI) {

   194       mDecoder->NetworkError();

   195       return NS_ERROR_DOM_BAD_URI;

   196     }

   197   }

   199   nsCOMPtr<nsIHttpChannel> hc = do_QueryInterface(aRequest);

   200   bool seekable = false;

   201   if (hc) {

   202     uint32_t responseStatus = 0;

   203     hc->GetResponseStatus(&responseStatus);

   204     bool succeeded = false;

   205     hc->GetRequestSucceeded(&succeeded);

   207     if (!succeeded && NS_SUCCEEDED(status)) {

   208       // HTTP-level error (e.g. 4xx); treat this as a fatal network-level error.

   209       // We might get this on a seek.

   210       // (Note that lower-level errors indicated by NS_FAILED(status) are

   211       // handled in OnStopRequest.)

   212       // A 416 error should treated as EOF here... it's possible

   213       // that we don't get Content-Length, we read N bytes, then we

   214       // suspend and resume, the resume reopens the channel and we seek to

   215       // offset N, but there are no more bytes, so we get a 416

   216       // "Requested Range Not Satisfiable".

   217       if (responseStatus == HTTP_REQUESTED_RANGE_NOT_SATISFIABLE_CODE) {

   218         // OnStopRequest will not be fired, so we need to do some of its

   219         // work here.

   220         mCacheStream.NotifyDataEnded(status);

   221       } else {

   222         mDecoder->NetworkError();

   223       }

   225       // This disconnects our listener so we don't get any more data. We

   226       // certainly don't want an error page to end up in our cache!

   227       CloseChannel();

   228       return NS_OK;

   229     }

   231     nsAutoCString ranges;

   232     hc->GetResponseHeader(NS_LITERAL_CSTRING("Accept-Ranges"),

   233                           ranges);

   234     bool acceptsRanges = ranges.EqualsLiteral("bytes");

   235     // True if this channel will not return an unbounded amount of data

   236     bool dataIsBounded = false;

   238     int64_t contentLength = -1;

   239     hc->GetContentLength(&contentLength);

   240     if (contentLength >= 0 && responseStatus == HTTP_OK_CODE) {

   241       // "OK" status means Content-Length is for the whole resource.

   242       // Since that's bounded, we know we have a finite-length resource.

   243       dataIsBounded = true;

   244     }

   246     if (mOffset == 0) {

   247       // Look for duration headers from known Ogg content systems.

   248       // In the case of multiple options for obtaining the duration

   249       // the order of precedence is:

   250       // 1) The Media resource metadata if possible (done by the decoder itself).

   251       // 2) Content-Duration message header.

   252       // 3) X-AMZ-Meta-Content-Duration.

   253       // 4) X-Content-Duration.

   254       // 5) Perform a seek in the decoder to find the value.

   255       nsAutoCString durationText;

   256       nsresult ec = NS_OK;

   257       rv = hc->GetResponseHeader(NS_LITERAL_CSTRING("Content-Duration"), durationText);

   258       if (NS_FAILED(rv)) {

   259         rv = hc->GetResponseHeader(NS_LITERAL_CSTRING("X-AMZ-Meta-Content-Duration"), durationText);

   260       }

   261       if (NS_FAILED(rv)) {

   262         rv = hc->GetResponseHeader(NS_LITERAL_CSTRING("X-Content-Duration"), durationText);

   263       }

   265       // If there is a Content-Duration header with a valid value, record

   266       // the duration.

   267       if (NS_SUCCEEDED(rv)) {

   268         double duration = durationText.ToDouble(&ec);

   269         if (ec == NS_OK && duration >= 0) {

   270           mDecoder->SetDuration(duration);

   271           // We know the resource must be bounded.

   272           dataIsBounded = true;

   273         }

   274       }

   275     }

   277     // Assume Range requests have a bounded upper limit unless the

   278     // Content-Range header tells us otherwise.

   279     bool boundedSeekLimit = true;

   280     // Check response code for byte-range requests (seeking, chunk requests).

   281     if (!mByteRange.IsNull() && (responseStatus == HTTP_PARTIAL_RESPONSE_CODE)) {

   282       // Parse Content-Range header.

   283       int64_t rangeStart = 0;

   284       int64_t rangeEnd = 0;

   285       int64_t rangeTotal = 0;

   286       rv = ParseContentRangeHeader(hc, rangeStart, rangeEnd, rangeTotal);

   287       if (NS_FAILED(rv)) {

   288         // Content-Range header text should be parse-able.

   289         CMLOG("Error processing \'Content-Range' for "

   290               "HTTP_PARTIAL_RESPONSE_CODE: rv[%x] channel[%p] decoder[%p]",

   291               rv, hc.get(), mDecoder);

   292         mDecoder->NetworkError();

   293         CloseChannel();

   294         return NS_OK;

   295       }

   297       // Give some warnings if the ranges are unexpected.

   298       // XXX These could be error conditions.

   299       NS_WARN_IF_FALSE(mByteRange.mStart == rangeStart,

   300                        "response range start does not match request");

   301       NS_WARN_IF_FALSE(mOffset == rangeStart,

   302                        "response range start does not match current offset");

   303       NS_WARN_IF_FALSE(mByteRange.mEnd == rangeEnd,

   304                        "response range end does not match request");

   305       // Notify media cache about the length and start offset of data received.

   306       // Note: If aRangeTotal == -1, then the total bytes is unknown at this stage.

   307       //       For now, tell the decoder that the stream is infinite.

   308       if (rangeTotal == -1) {

   309         boundedSeekLimit = false;

   310       } else {

   311         mCacheStream.NotifyDataLength(rangeTotal);

   312       }

   313       mCacheStream.NotifyDataStarted(rangeStart);

   315       mOffset = rangeStart;

   316       // We received 'Content-Range', so the server accepts range requests.

   317       acceptsRanges = true;

   318     } else if (((mOffset > 0) || !mByteRange.IsNull())

   319                && (responseStatus == HTTP_OK_CODE)) {

   320       // If we get an OK response but we were seeking, or requesting a byte

   321       // range, then we have to assume that seeking doesn't work. We also need

   322       // to tell the cache that it's getting data for the start of the stream.

   323       mCacheStream.NotifyDataStarted(0);

   324       mOffset = 0;

   326       // The server claimed it supported range requests.  It lied.

   327       acceptsRanges = false;

   328     } else if (mOffset == 0 &&

   329                (responseStatus == HTTP_OK_CODE ||

   330                 responseStatus == HTTP_PARTIAL_RESPONSE_CODE)) {

   331       if (contentLength >= 0) {

   332         mCacheStream.NotifyDataLength(contentLength);

   333       }

   334     }

   335     // XXX we probably should examine the Content-Range header in case

   336     // the server gave us a range which is not quite what we asked for

   338     // If we get an HTTP_OK_CODE response to our byte range request,

   339     // and the server isn't sending Accept-Ranges:bytes then we don't

   340     // support seeking.

   341     seekable =

   342       responseStatus == HTTP_PARTIAL_RESPONSE_CODE || acceptsRanges;

   343     if (seekable && boundedSeekLimit) {

   344       // If range requests are supported, and we did not see an unbounded

   345       // upper range limit, we assume the resource is bounded.

   346       dataIsBounded = true;

   347     }

   349     mDecoder->SetInfinite(!dataIsBounded);

   350   }

   351   mDecoder->SetTransportSeekable(seekable);

   352   mCacheStream.SetTransportSeekable(seekable);

   354   {

   355     MutexAutoLock lock(mLock);

   356     mIsTransportSeekable = seekable;

   357     mChannelStatistics->Start();

   358   }

   360   mReopenOnError = false;

   361   // If we are seeking to get metadata, because we are playing an OGG file,

   362   // ignore if the channel gets closed without us suspending it explicitly. We

   363   // don't want to tell the element that the download has finished whereas we

   364   // just happended to have reached the end of the media while seeking.

   365   mIgnoreClose = mSeekingForMetadata;

   367   if (mSuspendCount > 0) {

   368     // Re-suspend the channel if it needs to be suspended

   369     // No need to call PossiblySuspend here since the channel is

   370     // definitely in the right state for us in OnStartRequest.

   371     mChannel->Suspend();

   372     mIgnoreResume = false;

   373   }

   375   // Fires an initial progress event and sets up the stall counter so stall events

   376   // fire if no download occurs within the required time frame.

   377   mDecoder->Progress(false);

   379   return NS_OK;

   380 }

   382 bool

   383 ChannelMediaResource::IsTransportSeekable()

   384 {

   385   MutexAutoLock lock(mLock);

   386   return mIsTransportSeekable;

   387 }

   389 nsresult

   390 ChannelMediaResource::ParseContentRangeHeader(nsIHttpChannel * aHttpChan,

   391                                               int64_t& aRangeStart,

   392                                               int64_t& aRangeEnd,

   393                                               int64_t& aRangeTotal)

   394 {

   395   NS_ENSURE_ARG(aHttpChan);

   397   nsAutoCString rangeStr;

   398   nsresult rv = aHttpChan->GetResponseHeader(NS_LITERAL_CSTRING("Content-Range"),

   399                                              rangeStr);

   400   NS_ENSURE_SUCCESS(rv, rv);

   401   NS_ENSURE_FALSE(rangeStr.IsEmpty(), NS_ERROR_ILLEGAL_VALUE);

   403   // Parse the range header: e.g. Content-Range: bytes 7000-7999/8000.

   404   int32_t spacePos = rangeStr.Find(NS_LITERAL_CSTRING(" "));

   405   int32_t dashPos = rangeStr.Find(NS_LITERAL_CSTRING("-"), true, spacePos);

   406   int32_t slashPos = rangeStr.Find(NS_LITERAL_CSTRING("/"), true, dashPos);

   408   nsAutoCString aRangeStartText;

   409   rangeStr.Mid(aRangeStartText, spacePos+1, dashPos-(spacePos+1));

   410   aRangeStart = aRangeStartText.ToInteger64(&rv);

   411   NS_ENSURE_SUCCESS(rv, rv);

   412   NS_ENSURE_TRUE(0 <= aRangeStart, NS_ERROR_ILLEGAL_VALUE);

   414   nsAutoCString aRangeEndText;

   415   rangeStr.Mid(aRangeEndText, dashPos+1, slashPos-(dashPos+1));

   416   aRangeEnd = aRangeEndText.ToInteger64(&rv);

   417   NS_ENSURE_SUCCESS(rv, rv);

   418   NS_ENSURE_TRUE(aRangeStart < aRangeEnd, NS_ERROR_ILLEGAL_VALUE);

   420   nsAutoCString aRangeTotalText;

   421   rangeStr.Right(aRangeTotalText, rangeStr.Length()-(slashPos+1));

   422   if (aRangeTotalText[0] == '*') {

   423     aRangeTotal = -1;

   424   } else {

   425     aRangeTotal = aRangeTotalText.ToInteger64(&rv);

   426     NS_ENSURE_TRUE(aRangeEnd < aRangeTotal, NS_ERROR_ILLEGAL_VALUE);

   427     NS_ENSURE_SUCCESS(rv, rv);

   428   }

   430   CMLOG("Received bytes [%lld] to [%lld] of [%lld] for decoder[%p]",

   431         aRangeStart, aRangeEnd, aRangeTotal, mDecoder);

   433   return NS_OK;

   434 }

   436 nsresult

   437 ChannelMediaResource::OnStopRequest(nsIRequest* aRequest, nsresult aStatus)

   438 {

   439   NS_ASSERTION(mChannel.get() == aRequest, "Wrong channel!");

   440   NS_ASSERTION(mSuspendCount == 0,

   441                "How can OnStopRequest fire while we're suspended?");

   443   {

   444     MutexAutoLock lock(mLock);

   445     mChannelStatistics->Stop();

   446   }

   448   // Note that aStatus might have succeeded --- this might be a normal close

   449   // --- even in situations where the server cut us off because we were

   450   // suspended. So we need to "reopen on error" in that case too. The only

   451   // cases where we don't need to reopen are when *we* closed the stream.

   452   // But don't reopen if we need to seek and we don't think we can... that would

   453   // cause us to just re-read the stream, which would be really bad.

   454   if (mReopenOnError &&

   455       aStatus != NS_ERROR_PARSED_DATA_CACHED && aStatus != NS_BINDING_ABORTED &&

   456       (mOffset == 0 || mCacheStream.IsTransportSeekable())) {

   457     // If the stream did close normally, then if the server is seekable we'll

   458     // just seek to the end of the resource and get an HTTP 416 error because

   459     // there's nothing there, so this isn't bad.

   460     nsresult rv = CacheClientSeek(mOffset, false);

   461     if (NS_SUCCEEDED(rv))

   462       return rv;

   463     // If the reopen/reseek fails, just fall through and treat this

   464     // error as fatal.

   465   }

   467   if (!mIgnoreClose) {

   468     mCacheStream.NotifyDataEnded(aStatus);

   470     // Move this request back into the foreground.  This is necessary for

   471     // requests owned by video documents to ensure the load group fires

   472     // OnStopRequest when restoring from session history.

   473     nsLoadFlags loadFlags;

   474     DebugOnly<nsresult> rv = mChannel->GetLoadFlags(&loadFlags);

   475     NS_ASSERTION(NS_SUCCEEDED(rv), "GetLoadFlags() failed!");

   477     if (loadFlags & nsIRequest::LOAD_BACKGROUND) {

   478       ModifyLoadFlags(loadFlags & ~nsIRequest::LOAD_BACKGROUND);

   479     }

   480   }

   482   return NS_OK;

   483 }

   485 nsresult

   486 ChannelMediaResource::OnChannelRedirect(nsIChannel* aOld, nsIChannel* aNew,

   487                                         uint32_t aFlags)

   488 {

   489   mChannel = aNew;

   490   SetupChannelHeaders();

   491   return NS_OK;

   492 }

   494 struct CopySegmentClosure {

   495   nsCOMPtr<nsIPrincipal> mPrincipal;

   496   ChannelMediaResource*  mResource;

   497 };

   499 NS_METHOD

   500 ChannelMediaResource::CopySegmentToCache(nsIInputStream *aInStream,

   501                                          void *aClosure,

   502                                          const char *aFromSegment,

   503                                          uint32_t aToOffset,

   504                                          uint32_t aCount,

   505                                          uint32_t *aWriteCount)

   506 {

   507   CopySegmentClosure* closure = static_cast<CopySegmentClosure*>(aClosure);

   509   closure->mResource->mDecoder->NotifyDataArrived(aFromSegment, aCount, closure->mResource->mOffset);

   511   // Keep track of where we're up to.

   512   RESOURCE_LOG("%p [ChannelMediaResource]: CopySegmentToCache at mOffset [%lld] add "

   513                "[%d] bytes for decoder[%p]",

   514                closure->mResource, closure->mResource->mOffset, aCount,

   515                closure->mResource->mDecoder);

   516   closure->mResource->mOffset += aCount;

   518   closure->mResource->mCacheStream.NotifyDataReceived(aCount, aFromSegment,

   519                                                       closure->mPrincipal);

   520   *aWriteCount = aCount;

   521   return NS_OK;

   522 }

   524 nsresult

   525 ChannelMediaResource::OnDataAvailable(nsIRequest* aRequest,

   526                                       nsIInputStream* aStream,

   527                                       uint32_t aCount)

   528 {

   529   NS_ASSERTION(mChannel.get() == aRequest, "Wrong channel!");

   531   {

   532     MutexAutoLock lock(mLock);

   533     mChannelStatistics->AddBytes(aCount);

   534   }

   536   CopySegmentClosure closure;

   537   nsIScriptSecurityManager* secMan = nsContentUtils::GetSecurityManager();

   538   if (secMan && mChannel) {

   539     secMan->GetChannelPrincipal(mChannel, getter_AddRefs(closure.mPrincipal));

   540   }

   541   closure.mResource = this;

   543   uint32_t count = aCount;

   544   while (count > 0) {

   545     uint32_t read;

   546     nsresult rv = aStream->ReadSegments(CopySegmentToCache, &closure, count,

   547                                         &read);

   548     if (NS_FAILED(rv))

   549       return rv;

   550     NS_ASSERTION(read > 0, "Read 0 bytes while data was available?");

   551     count -= read;

   552   }

   554   return NS_OK;

   555 }

   557 nsresult ChannelMediaResource::Open(nsIStreamListener **aStreamListener)

   558 {

   559   NS_ASSERTION(NS_IsMainThread(), "Only call on main thread");

   561   if (!mChannelStatistics) {

   562     mChannelStatistics = new MediaChannelStatistics();

   563   }

   565   nsresult rv = mCacheStream.Init();

   566   if (NS_FAILED(rv))

   567     return rv;

   568   NS_ASSERTION(mOffset == 0, "Who set mOffset already?");

   570   if (!mChannel) {

   571     // When we're a clone, the decoder might ask us to Open even though

   572     // we haven't established an mChannel (because we might not need one)

   573     NS_ASSERTION(!aStreamListener,

   574                  "Should have already been given a channel if we're to return a stream listener");

   575     return NS_OK;

   576   }

   578   return OpenChannel(aStreamListener);

   579 }

   581 nsresult ChannelMediaResource::OpenChannel(nsIStreamListener** aStreamListener)

   582 {

   583   NS_ASSERTION(NS_IsMainThread(), "Only call on main thread");

   584   NS_ENSURE_TRUE(mChannel, NS_ERROR_NULL_POINTER);

   585   NS_ASSERTION(!mListener, "Listener should have been removed by now");

   587   if (aStreamListener) {

   588     *aStreamListener = nullptr;

   589   }

   591   if (mByteRange.IsNull()) {

   592     // We're not making a byte range request, so set the content length,

   593     // if it's available as an HTTP header. This ensures that MediaResource

   594     // wrapping objects for platform libraries that expect to know

   595     // the length of a resource can get it before OnStartRequest() fires.

   596     nsCOMPtr<nsIHttpChannel> hc = do_QueryInterface(mChannel);

   597     if (hc) {

   598       int64_t cl = -1;

   599       if (NS_SUCCEEDED(hc->GetContentLength(&cl)) && cl != -1) {

   600         mCacheStream.NotifyDataLength(cl);

   601       }

   602     }

   603   }

   605   mListener = new Listener(this);

   606   NS_ENSURE_TRUE(mListener, NS_ERROR_OUT_OF_MEMORY);

   608   if (aStreamListener) {

   609     *aStreamListener = mListener;

   610     NS_ADDREF(*aStreamListener);

   611   } else {

   612     mChannel->SetNotificationCallbacks(mListener.get());

   614     nsCOMPtr<nsIStreamListener> listener = mListener.get();

   616     // Ensure that if we're loading cross domain, that the server is sending

   617     // an authorizing Access-Control header.

   618     MediaDecoderOwner* owner = mDecoder->GetMediaOwner();

   619     NS_ENSURE_TRUE(owner, NS_ERROR_FAILURE);

   620     dom::HTMLMediaElement* element = owner->GetMediaElement();

   621     NS_ENSURE_TRUE(element, NS_ERROR_FAILURE);

   622     if (element->ShouldCheckAllowOrigin()) {

   623       nsRefPtr<nsCORSListenerProxy> crossSiteListener =

   624         new nsCORSListenerProxy(mListener,

   625                                 element->NodePrincipal(),

   626                                 false);

   627       nsresult rv = crossSiteListener->Init(mChannel);

   628       listener = crossSiteListener;

   629       NS_ENSURE_TRUE(crossSiteListener, NS_ERROR_OUT_OF_MEMORY);

   630       NS_ENSURE_SUCCESS(rv, rv);

   631     } else {

   632       nsresult rv = nsContentUtils::GetSecurityManager()->

   633         CheckLoadURIWithPrincipal(element->NodePrincipal(),

   634                                   mURI,

   635                                   nsIScriptSecurityManager::STANDARD);

   636       NS_ENSURE_SUCCESS(rv, rv);

   637     }

   639     SetupChannelHeaders();

   641     nsresult rv = mChannel->AsyncOpen(listener, nullptr);

   642     NS_ENSURE_SUCCESS(rv, rv);

   643     // Tell the media element that we are fetching data from a channel.

   644     element->DownloadResumed(true);

   645   }

   647   return NS_OK;

   648 }

   650 void ChannelMediaResource::SetupChannelHeaders()

   651 {

   652   // Always use a byte range request even if we're reading from the start

   653   // of the resource.

   654   // This enables us to detect if the stream supports byte range

   655   // requests, and therefore seeking, early.

   656   nsCOMPtr<nsIHttpChannel> hc = do_QueryInterface(mChannel);

   657   if (hc) {

   658     // Use |mByteRange| for a specific chunk, or |mOffset| if seeking in a

   659     // complete file download.

   660     nsAutoCString rangeString("bytes=");

   661     if (!mByteRange.IsNull()) {

   662       rangeString.AppendInt(mByteRange.mStart);

   663       mOffset = mByteRange.mStart;

   664     } else {

   665       rangeString.AppendInt(mOffset);

   666     }

   667     rangeString.Append("-");

   668     if (!mByteRange.IsNull()) {

   669       rangeString.AppendInt(mByteRange.mEnd);

   670     }

   671     hc->SetRequestHeader(NS_LITERAL_CSTRING("Range"), rangeString, false);

   673     // Send Accept header for video and audio types only (Bug 489071)

   674     NS_ASSERTION(NS_IsMainThread(), "Don't call on non-main thread");

   675     MediaDecoderOwner* owner = mDecoder->GetMediaOwner();

   676     if (!owner) {

   677       return;

   678     }

   679     dom::HTMLMediaElement* element = owner->GetMediaElement();

   680     if (!element) {

   681       return;

   682     }

   683     element->SetRequestHeaders(hc);

   684   } else {

   685     NS_ASSERTION(mOffset == 0, "Don't know how to seek on this channel type");

   686   }

   687 }

   689 nsresult ChannelMediaResource::Close()

   690 {

   691   NS_ASSERTION(NS_IsMainThread(), "Only call on main thread");

   693   mCacheStream.Close();

   694   CloseChannel();

   695   return NS_OK;

   696 }

   698 already_AddRefed<nsIPrincipal> ChannelMediaResource::GetCurrentPrincipal()

   699 {

   700   NS_ASSERTION(NS_IsMainThread(), "Only call on main thread");

   702   nsCOMPtr<nsIPrincipal> principal = mCacheStream.GetCurrentPrincipal();

   703   return principal.forget();

   704 }

   706 bool ChannelMediaResource::CanClone()

   707 {

   708   return mCacheStream.IsAvailableForSharing();

   709 }

   711 already_AddRefed<MediaResource> ChannelMediaResource::CloneData(MediaDecoder* aDecoder)

   712 {

   713   NS_ASSERTION(NS_IsMainThread(), "Only call on main thread");

   714   NS_ASSERTION(mCacheStream.IsAvailableForSharing(), "Stream can't be cloned");

   716   nsRefPtr<ChannelMediaResource> resource =

   717     new ChannelMediaResource(aDecoder,

   718                              nullptr,

   719                              mURI,

   720                              GetContentType());

   721   if (resource) {

   722     // Initially the clone is treated as suspended by the cache, because

   723     // we don't have a channel. If the cache needs to read data from the clone

   724     // it will call CacheClientResume (or CacheClientSeek with aResume true)

   725     // which will recreate the channel. This way, if all of the media data

   726     // is already in the cache we don't create an unnecessary HTTP channel

   727     // and perform a useless HTTP transaction.

   728     resource->mSuspendCount = 1;

   729     resource->mCacheStream.InitAsClone(&mCacheStream);

   730     resource->mChannelStatistics = new MediaChannelStatistics(mChannelStatistics);

   731     resource->mChannelStatistics->Stop();

   732   }

   733   return resource.forget();

   734 }

   736 void ChannelMediaResource::CloseChannel()

   737 {

   738   NS_ASSERTION(NS_IsMainThread(), "Only call on main thread");

   740   {

   741     MutexAutoLock lock(mLock);

   742     mChannelStatistics->Stop();

   743   }

   745   if (mListener) {

   746     mListener->Revoke();

   747     mListener = nullptr;

   748   }

   750   if (mChannel) {

   751     if (mSuspendCount > 0) {

   752       // Resume the channel before we cancel it

   753       PossiblyResume();

   754     }

   755     // The status we use here won't be passed to the decoder, since

   756     // we've already revoked the listener. It can however be passed

   757     // to nsDocumentViewer::LoadComplete if our channel is the one

   758     // that kicked off creation of a video document. We don't want that

   759     // document load to think there was an error.

   760     // NS_ERROR_PARSED_DATA_CACHED is the best thing we have for that

   761     // at the moment.

   762     mChannel->Cancel(NS_ERROR_PARSED_DATA_CACHED);

   763     mChannel = nullptr;

   764   }

   765 }

   767 nsresult ChannelMediaResource::ReadFromCache(char* aBuffer,

   768                                              int64_t aOffset,

   769                                              uint32_t aCount)

   770 {

   771   return mCacheStream.ReadFromCache(aBuffer, aOffset, aCount);

   772 }

   774 nsresult ChannelMediaResource::Read(char* aBuffer,

   775                                     uint32_t aCount,

   776                                     uint32_t* aBytes)

   777 {

   778   NS_ASSERTION(!NS_IsMainThread(), "Don't call on main thread");

   780   int64_t offset = mCacheStream.Tell();

   781   nsresult rv = mCacheStream.Read(aBuffer, aCount, aBytes);

   782   if (NS_SUCCEEDED(rv)) {

   783     DispatchBytesConsumed(*aBytes, offset);

   784   }

   785   return rv;

   786 }

   788 nsresult ChannelMediaResource::ReadAt(int64_t aOffset,

   789                                       char* aBuffer,

   790                                       uint32_t aCount,

   791                                       uint32_t* aBytes)

   792 {

   793   NS_ASSERTION(!NS_IsMainThread(), "Don't call on main thread");

   795   nsresult rv = mCacheStream.ReadAt(aOffset, aBuffer, aCount, aBytes);

   796   if (NS_SUCCEEDED(rv)) {

   797     DispatchBytesConsumed(*aBytes, aOffset);

   798   }

   799   return rv;

   800 }

   802 nsresult ChannelMediaResource::Seek(int32_t aWhence, int64_t aOffset)

   803 {

   804   NS_ASSERTION(!NS_IsMainThread(), "Don't call on main thread");

   806   CMLOG("Seek requested for aOffset [%lld] for decoder [%p]",

   807         aOffset, mDecoder);

   808   return mCacheStream.Seek(aWhence, aOffset);

   809 }

   811 void ChannelMediaResource::StartSeekingForMetadata()

   812 {

   813   mSeekingForMetadata = true;

   814 }

   816 void ChannelMediaResource::EndSeekingForMetadata()

   817 {

   818   mSeekingForMetadata = false;

   819 }

   821 int64_t ChannelMediaResource::Tell()

   822 {

   823   NS_ASSERTION(!NS_IsMainThread(), "Don't call on main thread");

   825   return mCacheStream.Tell();

   826 }

   828 nsresult ChannelMediaResource::GetCachedRanges(nsTArray<MediaByteRange>& aRanges)

   829 {

   830   return mCacheStream.GetCachedRanges(aRanges);

   831 }

   833 void ChannelMediaResource::Suspend(bool aCloseImmediately)

   834 {

   835   NS_ASSERTION(NS_IsMainThread(), "Don't call on non-main thread");

   837   MediaDecoderOwner* owner = mDecoder->GetMediaOwner();

   838   if (!owner) {

   839     // Shutting down; do nothing.

   840     return;

   841   }

   842   dom::HTMLMediaElement* element = owner->GetMediaElement();

   843   if (!element) {

   844     // Shutting down; do nothing.

   845     return;

   846   }

   848   if (mChannel) {

   849     if (aCloseImmediately && mCacheStream.IsTransportSeekable()) {

   850       // Kill off our channel right now, but don't tell anyone about it.

   851       mIgnoreClose = true;

   852       CloseChannel();

   853       element->DownloadSuspended();

   854     } else if (mSuspendCount == 0) {

   855       {

   856         MutexAutoLock lock(mLock);

   857         mChannelStatistics->Stop();

   858       }

   859       PossiblySuspend();

   860       element->DownloadSuspended();

   861     }

   862   }

   864   ++mSuspendCount;

   865 }

   867 void ChannelMediaResource::Resume()

   868 {

   869   NS_ASSERTION(NS_IsMainThread(), "Don't call on non-main thread");

   870   NS_ASSERTION(mSuspendCount > 0, "Too many resumes!");

   872   MediaDecoderOwner* owner = mDecoder->GetMediaOwner();

   873   if (!owner) {

   874     // Shutting down; do nothing.

   875     return;

   876   }

   877   dom::HTMLMediaElement* element = owner->GetMediaElement();

   878   if (!element) {

   879     // Shutting down; do nothing.

   880     return;

   881   }

   883   NS_ASSERTION(mSuspendCount > 0, "Resume without previous Suspend!");

   884   --mSuspendCount;

   885   if (mSuspendCount == 0) {

   886     if (mChannel) {

   887       // Just wake up our existing channel

   888       {

   889         MutexAutoLock lock(mLock);

   890         mChannelStatistics->Start();

   891       }

   892       // if an error occurs after Resume, assume it's because the server

   893       // timed out the connection and we should reopen it.

   894       mReopenOnError = true;

   895       PossiblyResume();

   896       element->DownloadResumed();

   897     } else {

   898       int64_t totalLength = mCacheStream.GetLength();

   899       // If mOffset is at the end of the stream, then we shouldn't try to

   900       // seek to it. The seek will fail and be wasted anyway. We can leave

   901       // the channel dead; if the media cache wants to read some other data

   902       // in the future, it will call CacheClientSeek itself which will reopen the

   903       // channel.

   904       if (totalLength < 0 || mOffset < totalLength) {

   905         // There is (or may be) data to read at mOffset, so start reading it.

   906         // Need to recreate the channel.

   907         CacheClientSeek(mOffset, false);

   908       }

   909       element->DownloadResumed();

   910     }

   911   }

   912 }

   914 nsresult

   915 ChannelMediaResource::RecreateChannel()

   916 {

   917   nsLoadFlags loadFlags =

   918     nsICachingChannel::LOAD_BYPASS_LOCAL_CACHE_IF_BUSY |

   919     (mLoadInBackground ? nsIRequest::LOAD_BACKGROUND : 0);

   921   MediaDecoderOwner* owner = mDecoder->GetMediaOwner();

   922   if (!owner) {

   923     // The decoder is being shut down, so don't bother opening a new channel

   924     return NS_OK;

   925   }

   926   dom::HTMLMediaElement* element = owner->GetMediaElement();

   927   if (!element) {

   928     // The decoder is being shut down, so don't bother opening a new channel

   929     return NS_OK;

   930   }

   931   nsCOMPtr<nsILoadGroup> loadGroup = element->GetDocumentLoadGroup();

   932   NS_ENSURE_TRUE(loadGroup, NS_ERROR_NULL_POINTER);

   934   nsresult rv = NS_NewChannel(getter_AddRefs(mChannel),

   935                               mURI,

   936                               nullptr,

   937                               loadGroup,

   938                               nullptr,

   939                               loadFlags);

   941   // We have cached the Content-Type, which should not change. Give a hint to

   942   // the channel to avoid a sniffing failure, which would be expected because we

   943   // are probably seeking in the middle of the bitstream, and sniffing relies

   944   // on the presence of a magic number at the beginning of the stream.

   945   NS_ASSERTION(!GetContentType().IsEmpty(),

   946       "When recreating a channel, we should know the Content-Type.");

   947   mChannel->SetContentType(GetContentType());

   949   return rv;

   950 }

   952 void

   953 ChannelMediaResource::DoNotifyDataReceived()

   954 {

   955   mDataReceivedEvent.Revoke();

   956   mDecoder->NotifyBytesDownloaded();

   957 }

   959 void

   960 ChannelMediaResource::CacheClientNotifyDataReceived()

   961 {

   962   NS_ASSERTION(NS_IsMainThread(), "Don't call on non-main thread");

   963   // NOTE: this can be called with the media cache lock held, so don't

   964   // block or do anything which might try to acquire a lock!

   966   if (mDataReceivedEvent.IsPending())

   967     return;

   969   mDataReceivedEvent =

   970     NS_NewNonOwningRunnableMethod(this, &ChannelMediaResource::DoNotifyDataReceived);

   971   NS_DispatchToMainThread(mDataReceivedEvent.get(), NS_DISPATCH_NORMAL);

   972 }

   974 class DataEnded : public nsRunnable {

   975 public:

   976   DataEnded(MediaDecoder* aDecoder, nsresult aStatus) :

   977     mDecoder(aDecoder), mStatus(aStatus) {}

   978   NS_IMETHOD Run() {

   979     mDecoder->NotifyDownloadEnded(mStatus);

   980     return NS_OK;

   981   }

   982 private:

   983   nsRefPtr<MediaDecoder> mDecoder;

   984   nsresult                 mStatus;

   985 };

   987 void

   988 ChannelMediaResource::CacheClientNotifyDataEnded(nsresult aStatus)

   989 {

   990   NS_ASSERTION(NS_IsMainThread(), "Don't call on non-main thread");

   991   // NOTE: this can be called with the media cache lock held, so don't

   992   // block or do anything which might try to acquire a lock!

   994   nsCOMPtr<nsIRunnable> event = new DataEnded(mDecoder, aStatus);

   995   NS_DispatchToMainThread(event, NS_DISPATCH_NORMAL);

   996 }

   998 void

   999 ChannelMediaResource::CacheClientNotifyPrincipalChanged()

  1000 {

  1001   NS_ASSERTION(NS_IsMainThread(), "Don't call on non-main thread");

  1003   mDecoder->NotifyPrincipalChanged();

  1004 }

  1006 nsresult

  1007 ChannelMediaResource::CacheClientSeek(int64_t aOffset, bool aResume)

  1008 {

  1009   NS_ASSERTION(NS_IsMainThread(), "Don't call on non-main thread");

  1011   CMLOG("CacheClientSeek requested for aOffset [%lld] for decoder [%p]",

  1012         aOffset, mDecoder);

  1014   CloseChannel();

  1016   if (aResume) {

  1017     NS_ASSERTION(mSuspendCount > 0, "Too many resumes!");

  1018     // No need to mess with the channel, since we're making a new one

  1019     --mSuspendCount;

  1020   }

  1022   mOffset = aOffset;

  1024   if (mSuspendCount > 0) {

  1025     // Close the existing channel to force the channel to be recreated at

  1026     // the correct offset upon resume.

  1027     if (mChannel) {

  1028       mIgnoreClose = true;

  1029       CloseChannel();

  1030     }

  1031     return NS_OK;

  1032   }

  1034   nsresult rv = RecreateChannel();

  1035   if (NS_FAILED(rv))

  1036     return rv;

  1038   return OpenChannel(nullptr);

  1039 }

  1041 void

  1042 ChannelMediaResource::FlushCache()

  1043 {

  1044   NS_ASSERTION(NS_IsMainThread(), "Should be on main thread.");

  1046   // Ensure that data in the cache's partial block is written to disk.

  1047   mCacheStream.FlushPartialBlock();

  1048 }

  1050 void

  1051 ChannelMediaResource::NotifyLastByteRange()

  1052 {

  1053   NS_ASSERTION(NS_IsMainThread(), "Should be on main thread.");

  1055   // Tell media cache that the last data has been downloaded.

  1056   // Note: subsequent seeks will require re-opening the channel etc.

  1057   mCacheStream.NotifyDataEnded(NS_OK);

  1059 }

  1061 nsresult

  1062 ChannelMediaResource::CacheClientSuspend()

  1063 {

  1064   Suspend(false);

  1066   mDecoder->NotifySuspendedStatusChanged();

  1067   return NS_OK;

  1068 }

  1070 nsresult

  1071 ChannelMediaResource::CacheClientResume()

  1072 {

  1073   Resume();

  1075   mDecoder->NotifySuspendedStatusChanged();

  1076   return NS_OK;

  1077 }

  1079 int64_t

  1080 ChannelMediaResource::GetNextCachedData(int64_t aOffset)

  1081 {

  1082   return mCacheStream.GetNextCachedData(aOffset);

  1083 }

  1085 int64_t

  1086 ChannelMediaResource::GetCachedDataEnd(int64_t aOffset)

  1087 {

  1088   return mCacheStream.GetCachedDataEnd(aOffset);

  1089 }

  1091 bool

  1092 ChannelMediaResource::IsDataCachedToEndOfResource(int64_t aOffset)

  1093 {

  1094   return mCacheStream.IsDataCachedToEndOfStream(aOffset);

  1095 }

  1097 void

  1098 ChannelMediaResource::EnsureCacheUpToDate()

  1099 {

  1100   mCacheStream.EnsureCacheUpdate();

  1101 }

  1103 bool

  1104 ChannelMediaResource::IsSuspendedByCache()

  1105 {

  1106   return mCacheStream.AreAllStreamsForResourceSuspended();

  1107 }

  1109 bool

  1110 ChannelMediaResource::IsSuspended()

  1111 {

  1112   MutexAutoLock lock(mLock);

  1113   return mSuspendCount > 0;

  1114 }

  1116 void

  1117 ChannelMediaResource::SetReadMode(MediaCacheStream::ReadMode aMode)

  1118 {

  1119   mCacheStream.SetReadMode(aMode);

  1120 }

  1122 void

  1123 ChannelMediaResource::SetPlaybackRate(uint32_t aBytesPerSecond)

  1124 {

  1125   mCacheStream.SetPlaybackRate(aBytesPerSecond);

  1126 }

  1128 void

  1129 ChannelMediaResource::Pin()

  1130 {

  1131   mCacheStream.Pin();

  1132 }

  1134 void

  1135 ChannelMediaResource::Unpin()

  1136 {

  1137   mCacheStream.Unpin();

  1138 }

  1140 double

  1141 ChannelMediaResource::GetDownloadRate(bool* aIsReliable)

  1142 {

  1143   MutexAutoLock lock(mLock);

  1144   return mChannelStatistics->GetRate(aIsReliable);

  1145 }

  1147 int64_t

  1148 ChannelMediaResource::GetLength()

  1149 {

  1150   return mCacheStream.GetLength();

  1151 }

  1153 void

  1154 ChannelMediaResource::PossiblySuspend()

  1155 {

  1156   bool isPending = false;

  1157   nsresult rv = mChannel->IsPending(&isPending);

  1158   if (NS_SUCCEEDED(rv) && isPending) {

  1159     mChannel->Suspend();

  1160     mIgnoreResume = false;

  1161   } else {

  1162     mIgnoreResume = true;

  1163   }

  1164 }

  1166 void

  1167 ChannelMediaResource::PossiblyResume()

  1168 {

  1169   if (!mIgnoreResume) {

  1170     mChannel->Resume();

  1171   } else {

  1172     mIgnoreResume = false;

  1173   }

  1174 }

  1176 class FileMediaResource : public BaseMediaResource

  1177 {

  1178 public:

  1179   FileMediaResource(MediaDecoder* aDecoder,

  1180                     nsIChannel* aChannel,

  1181                     nsIURI* aURI,

  1182                     const nsACString& aContentType) :

  1183     BaseMediaResource(aDecoder, aChannel, aURI, aContentType),

  1184     mSize(-1),

  1185     mLock("FileMediaResource.mLock"),

  1186     mSizeInitialized(false)

  1187   {

  1188   }

  1189   ~FileMediaResource()

  1190   {

  1191   }

  1193   // Main thread

  1194   virtual nsresult Open(nsIStreamListener** aStreamListener);

  1195   virtual nsresult Close();

  1196   virtual void     Suspend(bool aCloseImmediately) {}

  1197   virtual void     Resume() {}

  1198   virtual already_AddRefed<nsIPrincipal> GetCurrentPrincipal();

  1199   virtual bool     CanClone();

  1200   virtual already_AddRefed<MediaResource> CloneData(MediaDecoder* aDecoder);

  1201   virtual nsresult ReadFromCache(char* aBuffer, int64_t aOffset, uint32_t aCount);

  1203   // These methods are called off the main thread.

  1205   // Other thread

  1206   virtual void     SetReadMode(MediaCacheStream::ReadMode aMode) {}

  1207   virtual void     SetPlaybackRate(uint32_t aBytesPerSecond) {}

  1208   virtual nsresult Read(char* aBuffer, uint32_t aCount, uint32_t* aBytes);

  1209   virtual nsresult ReadAt(int64_t aOffset, char* aBuffer,

  1210                           uint32_t aCount, uint32_t* aBytes);

  1211   virtual nsresult Seek(int32_t aWhence, int64_t aOffset);

  1212   virtual void     StartSeekingForMetadata() {};

  1213   virtual void     EndSeekingForMetadata() {};

  1214   virtual int64_t  Tell();

  1216   // Any thread

  1217   virtual void    Pin() {}

  1218   virtual void    Unpin() {}

  1219   virtual double  GetDownloadRate(bool* aIsReliable)

  1220   {

  1221     // The data's all already here

  1222     *aIsReliable = true;

  1223     return 100*1024*1024; // arbitray, use 100MB/s

  1224   }

  1225   virtual int64_t GetLength() {

  1226     MutexAutoLock lock(mLock);

  1228     EnsureSizeInitialized();

  1229     return mSizeInitialized ? mSize : 0;

  1230   }

  1231   virtual int64_t GetNextCachedData(int64_t aOffset)

  1232   {

  1233     MutexAutoLock lock(mLock);

  1235     EnsureSizeInitialized();

  1236     return (aOffset < mSize) ? aOffset : -1;

  1237   }

  1238   virtual int64_t GetCachedDataEnd(int64_t aOffset) {

  1239     MutexAutoLock lock(mLock);

  1241     EnsureSizeInitialized();

  1242     return std::max(aOffset, mSize);

  1243   }

  1244   virtual bool    IsDataCachedToEndOfResource(int64_t aOffset) { return true; }

  1245   virtual bool    IsSuspendedByCache() { return false; }

  1246   virtual bool    IsSuspended() { return false; }

  1247   virtual bool    IsTransportSeekable() MOZ_OVERRIDE { return true; }

  1249   nsresult GetCachedRanges(nsTArray<MediaByteRange>& aRanges);

  1251   virtual size_t SizeOfExcludingThis(

  1252                         MallocSizeOf aMallocSizeOf) const MOZ_OVERRIDE

  1253   {

  1254     // Might be useful to track in the future:

  1255     // - mInput

  1256     return BaseMediaResource::SizeOfExcludingThis(aMallocSizeOf);

  1257   }

  1259   virtual size_t SizeOfIncludingThis(

  1260                         MallocSizeOf aMallocSizeOf) const MOZ_OVERRIDE

  1261   {

  1262     return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);

  1263   }

  1265 protected:

  1266   // These Unsafe variants of Read and Seek perform their operations

  1267   // without acquiring mLock. The caller must obtain the lock before

  1268   // calling. The implmentation of Read, Seek and ReadAt obtains the

  1269   // lock before calling these Unsafe variants to read or seek.

  1270   nsresult UnsafeRead(char* aBuffer, uint32_t aCount, uint32_t* aBytes);

  1271   nsresult UnsafeSeek(int32_t aWhence, int64_t aOffset);

  1272 private:

  1273   // Ensures mSize is initialized, if it can be.

  1274   // mLock must be held when this is called, and mInput must be non-null.

  1275   void EnsureSizeInitialized();

  1277   // The file size, or -1 if not known. Immutable after Open().

  1278   // Can be used from any thread.

  1279   int64_t mSize;

  1281   // This lock handles synchronisation between calls to Close() and

  1282   // the Read, Seek, etc calls. Close must not be called while a

  1283   // Read or Seek is in progress since it resets various internal

  1284   // values to null.

  1285   // This lock protects mSeekable, mInput, mSize, and mSizeInitialized.

  1286   Mutex mLock;

  1288   // Seekable stream interface to file. This can be used from any

  1289   // thread.

  1290   nsCOMPtr<nsISeekableStream> mSeekable;

  1292   // Input stream for the media data. This can be used from any

  1293   // thread.

  1294   nsCOMPtr<nsIInputStream>  mInput;

  1296   // Whether we've attempted to initialize mSize. Note that mSize can be -1

  1297   // when mSizeInitialized is true if we tried and failed to get the size

  1298   // of the file.

  1299   bool mSizeInitialized;

  1300 };

  1302 void FileMediaResource::EnsureSizeInitialized()

  1303 {

  1304   mLock.AssertCurrentThreadOwns();

  1305   NS_ASSERTION(mInput, "Must have file input stream");

  1306   if (mSizeInitialized) {

  1307     return;

  1308   }

  1309   mSizeInitialized = true;

  1310   // Get the file size and inform the decoder.

  1311   uint64_t size;

  1312   nsresult res = mInput->Available(&size);

  1313   if (NS_SUCCEEDED(res) && size <= INT64_MAX) {

  1314     mSize = (int64_t)size;

  1315     nsCOMPtr<nsIRunnable> event = new DataEnded(mDecoder, NS_OK);

  1316     NS_DispatchToMainThread(event, NS_DISPATCH_NORMAL);

  1317   }

  1318 }

  1320 nsresult FileMediaResource::GetCachedRanges(nsTArray<MediaByteRange>& aRanges)

  1321 {

  1322   MutexAutoLock lock(mLock);

  1324   EnsureSizeInitialized();

  1325   if (mSize == -1) {

  1326     return NS_ERROR_FAILURE;

  1327   }

  1328   aRanges.AppendElement(MediaByteRange(0, mSize));

  1329   return NS_OK;

  1330 }

  1332 nsresult FileMediaResource::Open(nsIStreamListener** aStreamListener)

  1333 {

  1334   NS_ASSERTION(NS_IsMainThread(), "Only call on main thread");

  1336   if (aStreamListener) {

  1337     *aStreamListener = nullptr;

  1338   }

  1340   nsresult rv = NS_OK;

  1341   if (aStreamListener) {

  1342     // The channel is already open. We need a synchronous stream that

  1343     // implements nsISeekableStream, so we have to find the underlying

  1344     // file and reopen it

  1345     nsCOMPtr<nsIFileChannel> fc(do_QueryInterface(mChannel));

  1346     if (fc) {

  1347       nsCOMPtr<nsIFile> file;

  1348       rv = fc->GetFile(getter_AddRefs(file));

  1349       NS_ENSURE_SUCCESS(rv, rv);

  1351       rv = NS_NewLocalFileInputStream(getter_AddRefs(mInput), file);

  1352     } else if (IsBlobURI(mURI)) {

  1353       rv = NS_GetStreamForBlobURI(mURI, getter_AddRefs(mInput));

  1354     }

  1355   } else {

  1356     // Ensure that we never load a local file from some page on a

  1357     // web server.

  1358     MediaDecoderOwner* owner = mDecoder->GetMediaOwner();

  1359     NS_ENSURE_TRUE(owner, NS_ERROR_FAILURE);

  1360     dom::HTMLMediaElement* element = owner->GetMediaElement();

  1361     NS_ENSURE_TRUE(element, NS_ERROR_FAILURE);

  1363     rv = nsContentUtils::GetSecurityManager()->

  1364            CheckLoadURIWithPrincipal(element->NodePrincipal(),

  1365                                      mURI,

  1366                                      nsIScriptSecurityManager::STANDARD);

  1367     NS_ENSURE_SUCCESS(rv, rv);

  1369     rv = mChannel->Open(getter_AddRefs(mInput));

  1370   }

  1371   NS_ENSURE_SUCCESS(rv, rv);

  1373   mSeekable = do_QueryInterface(mInput);

  1374   if (!mSeekable) {

  1375     // XXX The file may just be a .url or similar

  1376     // shortcut that points to a Web site. We need to fix this by

  1377     // doing an async open and waiting until we locate the real resource,

  1378     // then using that (if it's still a file!).

  1379     return NS_ERROR_FAILURE;

  1380   }

  1382   return NS_OK;

  1383 }

  1385 nsresult FileMediaResource::Close()

  1386 {

  1387   NS_ASSERTION(NS_IsMainThread(), "Only call on main thread");

  1389   // Since mChennel is only accessed by main thread, there is no necessary to

  1390   // take the lock.

  1391   if (mChannel) {

  1392     mChannel->Cancel(NS_ERROR_PARSED_DATA_CACHED);

  1393     mChannel = nullptr;

  1394   }

  1396   return NS_OK;

  1397 }

  1399 already_AddRefed<nsIPrincipal> FileMediaResource::GetCurrentPrincipal()

  1400 {

  1401   NS_ASSERTION(NS_IsMainThread(), "Only call on main thread");

  1403   nsCOMPtr<nsIPrincipal> principal;

  1404   nsIScriptSecurityManager* secMan = nsContentUtils::GetSecurityManager();

  1405   if (!secMan || !mChannel)

  1406     return nullptr;

  1407   secMan->GetChannelPrincipal(mChannel, getter_AddRefs(principal));

  1408   return principal.forget();

  1409 }

  1411 bool FileMediaResource::CanClone()

  1412 {

  1413   return true;

  1414 }

  1416 already_AddRefed<MediaResource> FileMediaResource::CloneData(MediaDecoder* aDecoder)

  1417 {

  1418   NS_ASSERTION(NS_IsMainThread(), "Only call on main thread");

  1420   MediaDecoderOwner* owner = mDecoder->GetMediaOwner();

  1421   if (!owner) {

  1422     // The decoder is being shut down, so we can't clone

  1423     return nullptr;

  1424   }

  1425   dom::HTMLMediaElement* element = owner->GetMediaElement();

  1426   if (!element) {

  1427     // The decoder is being shut down, so we can't clone

  1428     return nullptr;

  1429   }

  1430   nsCOMPtr<nsILoadGroup> loadGroup = element->GetDocumentLoadGroup();

  1431   NS_ENSURE_TRUE(loadGroup, nullptr);

  1433   nsCOMPtr<nsIChannel> channel;

  1434   nsresult rv =

  1435     NS_NewChannel(getter_AddRefs(channel), mURI, nullptr, loadGroup, nullptr, 0);

  1436   if (NS_FAILED(rv))

  1437     return nullptr;

  1439   nsRefPtr<MediaResource> resource(new FileMediaResource(aDecoder, channel, mURI, GetContentType()));

  1440   return resource.forget();

  1441 }

  1443 nsresult FileMediaResource::ReadFromCache(char* aBuffer, int64_t aOffset, uint32_t aCount)

  1444 {

  1445   MutexAutoLock lock(mLock);

  1447   EnsureSizeInitialized();

  1448   int64_t offset = 0;

  1449   nsresult res = mSeekable->Tell(&offset);

  1450   NS_ENSURE_SUCCESS(res,res);

  1451   res = mSeekable->Seek(nsISeekableStream::NS_SEEK_SET, aOffset);

  1452   NS_ENSURE_SUCCESS(res,res);

  1453   uint32_t bytesRead = 0;

  1454   do {

  1455     uint32_t x = 0;

  1456     uint32_t bytesToRead = aCount - bytesRead;

  1457     res = mInput->Read(aBuffer, bytesToRead, &x);

  1458     bytesRead += x;

  1459   } while (bytesRead != aCount && res == NS_OK);

  1461   // Reset read head to original position so we don't disturb any other

  1462   // reading thread.

  1463   nsresult seekres = mSeekable->Seek(nsISeekableStream::NS_SEEK_SET, offset);

  1465   // If a read failed in the loop above, we want to return its failure code.

  1466   NS_ENSURE_SUCCESS(res,res);

  1468   // Else we succeed if the reset-seek succeeds.

  1469   return seekres;

  1470 }

  1472 nsresult FileMediaResource::Read(char* aBuffer, uint32_t aCount, uint32_t* aBytes)

  1473 {

  1474   nsresult rv;

  1475   int64_t offset = 0;

  1476   {

  1477     MutexAutoLock lock(mLock);

  1478     mSeekable->Tell(&offset);

  1479     rv = UnsafeRead(aBuffer, aCount, aBytes);

  1480   }

  1481   if (NS_SUCCEEDED(rv)) {

  1482     DispatchBytesConsumed(*aBytes, offset);

  1483   }

  1484   return rv;

  1485 }

  1487 nsresult FileMediaResource::UnsafeRead(char* aBuffer, uint32_t aCount, uint32_t* aBytes)

  1488 {

  1489   EnsureSizeInitialized();

  1490   return mInput->Read(aBuffer, aCount, aBytes);

  1491 }

  1493 nsresult FileMediaResource::ReadAt(int64_t aOffset, char* aBuffer,

  1494                                    uint32_t aCount, uint32_t* aBytes)

  1495 {

  1496   NS_ASSERTION(!NS_IsMainThread(), "Don't call on main thread");

  1498   nsresult rv;

  1499   {

  1500     MutexAutoLock lock(mLock);

  1501     rv = UnsafeSeek(nsISeekableStream::NS_SEEK_SET, aOffset);

  1502     if (NS_FAILED(rv)) return rv;

  1503     rv = UnsafeRead(aBuffer, aCount, aBytes);

  1504   }

  1505   if (NS_SUCCEEDED(rv)) {

  1506     DispatchBytesConsumed(*aBytes, aOffset);

  1507   }

  1508   return rv;

  1509 }

  1511 nsresult FileMediaResource::Seek(int32_t aWhence, int64_t aOffset)

  1512 {

  1513   NS_ASSERTION(!NS_IsMainThread(), "Don't call on main thread");

  1515   MutexAutoLock lock(mLock);

  1516   return UnsafeSeek(aWhence, aOffset);

  1517 }

  1519 nsresult FileMediaResource::UnsafeSeek(int32_t aWhence, int64_t aOffset)

  1520 {

  1521   NS_ASSERTION(!NS_IsMainThread(), "Don't call on main thread");

  1523   if (!mSeekable)

  1524     return NS_ERROR_FAILURE;

  1525   EnsureSizeInitialized();

  1526   return mSeekable->Seek(aWhence, aOffset);

  1527 }

  1529 int64_t FileMediaResource::Tell()

  1530 {

  1531   NS_ASSERTION(!NS_IsMainThread(), "Don't call on main thread");

  1533   MutexAutoLock lock(mLock);

  1534   if (!mSeekable)

  1535     return 0;

  1536   EnsureSizeInitialized();

  1538   int64_t offset = 0;

  1539   mSeekable->Tell(&offset);

  1540   return offset;

  1541 }

  1543 already_AddRefed<MediaResource>

  1544 MediaResource::Create(MediaDecoder* aDecoder, nsIChannel* aChannel)

  1545 {

  1546   NS_ASSERTION(NS_IsMainThread(),

  1547                "MediaResource::Open called on non-main thread");

  1549   // If the channel was redirected, we want the post-redirect URI;

  1550   // but if the URI scheme was expanded, say from chrome: to jar:file:,

  1551   // we want the original URI.

  1552   nsCOMPtr<nsIURI> uri;

  1553   nsresult rv = NS_GetFinalChannelURI(aChannel, getter_AddRefs(uri));

  1554   NS_ENSURE_SUCCESS(rv, nullptr);

  1556   nsAutoCString contentType;

  1557   aChannel->GetContentType(contentType);

  1559   nsCOMPtr<nsIFileChannel> fc = do_QueryInterface(aChannel);

  1560   nsRefPtr<MediaResource> resource;

  1561   if (fc || IsBlobURI(uri)) {

  1562     resource = new FileMediaResource(aDecoder, aChannel, uri, contentType);

  1563   } else if (IsRtspURI(uri)) {

  1564     resource = new RtspMediaResource(aDecoder, aChannel, uri, contentType);

  1565   } else {

  1566     resource = new ChannelMediaResource(aDecoder, aChannel, uri, contentType);

  1567   }

  1568   return resource.forget();

  1569 }

  1571 void BaseMediaResource::MoveLoadsToBackground() {

  1572   NS_ASSERTION(!mLoadInBackground, "Why are you calling this more than once?");

  1573   mLoadInBackground = true;

  1574   if (!mChannel) {

  1575     // No channel, resource is probably already loaded.

  1576     return;

  1577   }

  1579   MediaDecoderOwner* owner = mDecoder->GetMediaOwner();

  1580   if (!owner) {

  1581     NS_WARNING("Null owner in MediaResource::MoveLoadsToBackground()");

  1582     return;

  1583   }

  1584   dom::HTMLMediaElement* element = owner->GetMediaElement();

  1585   if (!element) {

  1586     NS_WARNING("Null element in MediaResource::MoveLoadsToBackground()");

  1587     return;

  1588   }

  1590   bool isPending = false;

  1591   if (NS_SUCCEEDED(mChannel->IsPending(&isPending)) &&

  1592       isPending) {

  1593     nsLoadFlags loadFlags;

  1594     DebugOnly<nsresult> rv = mChannel->GetLoadFlags(&loadFlags);

  1595     NS_ASSERTION(NS_SUCCEEDED(rv), "GetLoadFlags() failed!");

  1597     loadFlags |= nsIRequest::LOAD_BACKGROUND;

  1598     ModifyLoadFlags(loadFlags);

  1599   }

  1600 }

  1602 void BaseMediaResource::ModifyLoadFlags(nsLoadFlags aFlags)

  1603 {

  1604   nsCOMPtr<nsILoadGroup> loadGroup;

  1605   DebugOnly<nsresult> rv = mChannel->GetLoadGroup(getter_AddRefs(loadGroup));

  1606   NS_ASSERTION(NS_SUCCEEDED(rv), "GetLoadGroup() failed!");

  1608   nsresult status;

  1609   mChannel->GetStatus(&status);

  1611   // Note: if (NS_FAILED(status)), the channel won't be in the load group.

  1612   if (loadGroup &&

  1613       NS_SUCCEEDED(status)) {

  1614     rv = loadGroup->RemoveRequest(mChannel, nullptr, status);

  1615     NS_ASSERTION(NS_SUCCEEDED(rv), "RemoveRequest() failed!");

  1616   }

  1618   rv = mChannel->SetLoadFlags(aFlags);

  1619   NS_ASSERTION(NS_SUCCEEDED(rv), "SetLoadFlags() failed!");

  1621   if (loadGroup &&

  1622       NS_SUCCEEDED(status)) {

  1623     rv = loadGroup->AddRequest(mChannel, nullptr);

  1624     NS_ASSERTION(NS_SUCCEEDED(rv), "AddRequest() failed!");

  1625   }

  1626 }

  1628 class DispatchBytesConsumedEvent : public nsRunnable {

  1629 public:

  1630   DispatchBytesConsumedEvent(MediaDecoder* aDecoder,

  1631                              int64_t aNumBytes,

  1632                              int64_t aOffset)

  1633     : mDecoder(aDecoder),

  1634       mNumBytes(aNumBytes),

  1635       mOffset(aOffset)

  1636   {

  1637     MOZ_COUNT_CTOR(DispatchBytesConsumedEvent);

  1638   }

  1640   ~DispatchBytesConsumedEvent()

  1641   {

  1642     MOZ_COUNT_DTOR(DispatchBytesConsumedEvent);

  1643   }

  1645   NS_IMETHOD Run() {

  1646     mDecoder->NotifyBytesConsumed(mNumBytes, mOffset);

  1647     // Drop ref to decoder on main thread, just in case this reference

  1648     // ends up being the last owning reference somehow.

  1649     mDecoder = nullptr;

  1650     return NS_OK;

  1651   }

  1653   RefPtr<MediaDecoder> mDecoder;

  1654   int64_t mNumBytes;

  1655   int64_t mOffset;

  1656 };

  1658 void BaseMediaResource::DispatchBytesConsumed(int64_t aNumBytes, int64_t aOffset)

  1659 {

  1660   if (aNumBytes <= 0) {

  1661     return;

  1662   }

  1663   RefPtr<nsIRunnable> event(new DispatchBytesConsumedEvent(mDecoder, aNumBytes, aOffset));

  1664   NS_DispatchToMainThread(event, NS_DISPATCH_NORMAL);

  1665 }

  1667 } // namespace mozilla

The Tor Browser / file revision

content/media/MediaResource.cpp@44a2da4a2ab2

content/media/MediaResource.cpp