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gecko/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: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "mozilla/DebugOnly.h"
#include "MediaResource.h"
#include "mozilla/Mutex.h"
#include "nsDebug.h"
#include "MediaDecoder.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 "nsError.h"
#include "nsICachingChannel.h"
#include "nsURILoader.h"
#include "nsIAsyncVerifyRedirectCallback.h"
#include "nsContentUtils.h"
#include "nsHostObjectProtocolHandler.h"
#include <algorithm>
#ifdef PR_LOGGING
PRLogModuleInfo* gMediaResourceLog;
#define LOG(msg, ...) PR_LOG(gMediaResourceLog, PR_LOG_DEBUG, \
(msg, ##__VA_ARGS__))
// Debug logging macro with object pointer and class name.
#define CMLOG(msg, ...) \
LOG("%p [ChannelMediaResource]: " msg, this, ##__VA_ARGS__)
#else
#define LOG(msg, ...)
#define CMLOG(msg, ...)
#endif
static const uint32_t HTTP_OK_CODE = 200;
static const uint32_t HTTP_PARTIAL_RESPONSE_CODE = 206;
namespace mozilla {
ChannelMediaResource::ChannelMediaResource(MediaDecoder* aDecoder,
nsIChannel* aChannel, nsIURI* aURI)
: BaseMediaResource(aDecoder, aChannel, aURI),
mOffset(0), mSuspendCount(0),
mReopenOnError(false), mIgnoreClose(false),
mCacheStream(this),
mLock("ChannelMediaResource.mLock"),
mIgnoreResume(false),
mSeekingForMetadata(false),
mByteRangeDownloads(false),
mByteRangeFirstOpen(true),
mSeekOffsetMonitor("media.dashseekmonitor"),
mSeekOffset(-1)
{
#ifdef PR_LOGGING
if (!gMediaResourceLog) {
gMediaResourceLog = PR_NewLogModule("MediaResource");
}
#endif
}
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,
uint64_t aOffset,
uint32_t aCount)
{
if (!mResource)
return NS_OK;
return mResource->OnDataAvailable(aRequest, aStream, aCount);
}
nsresult
ChannelMediaResource::Listener::AsyncOnChannelRedirect(nsIChannel* aOldChannel,
nsIChannel* aNewChannel,
uint32_t 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!");
MediaDecoderOwner* owner = mDecoder->GetMediaOwner();
NS_ENSURE_TRUE(owner, NS_ERROR_FAILURE);
nsHTMLMediaElement* element = owner->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) {
uint32_t 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;
}
nsAutoCString 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.
nsAutoCString durationText;
nsresult ec = NS_OK;
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 there is no Content-Duration header, or if the value for this header
// is not valid, set the media as being infinite.
if (NS_SUCCEEDED(rv)) {
double duration = durationText.ToDouble(&ec);
if (ec == NS_OK && duration >= 0) {
mDecoder->SetDuration(duration);
} else {
mDecoder->SetInfinite(true);
}
} else {
mDecoder->SetInfinite(true);
}
}
// Check response code for byte-range requests (seeking, chunk requests).
if (!mByteRange.IsNull() && (responseStatus == HTTP_PARTIAL_RESPONSE_CODE)) {
// Parse Content-Range header.
int64_t rangeStart = 0;
int64_t rangeEnd = 0;
int64_t rangeTotal = 0;
rv = ParseContentRangeHeader(hc, rangeStart, rangeEnd, rangeTotal);
if (NS_FAILED(rv)) {
// Content-Range header text should be parse-able.
CMLOG("Error processing \'Content-Range' for "
"HTTP_PARTIAL_RESPONSE_CODE: rv[%x] channel[%p] decoder[%p]",
rv, hc.get(), mDecoder);
mDecoder->NetworkError();
CloseChannel();
return NS_OK;
}
// Give some warnings if the ranges are unexpected.
// XXX These could be error conditions.
NS_WARN_IF_FALSE(mByteRange.mStart == rangeStart,
"response range start does not match request");
NS_WARN_IF_FALSE(mOffset == rangeStart,
"response range start does not match current offset");
NS_WARN_IF_FALSE(mByteRange.mEnd == rangeEnd,
"response range end does not match request");
// Notify media cache about the length and start offset of data received.
// Note: If aRangeTotal == -1, then the total bytes is unknown at this stage.
// For now, tell the decoder that the stream is infinite.
if (rangeTotal != -1) {
mCacheStream.NotifyDataLength(rangeTotal);
} else {
mDecoder->SetInfinite(true);
}
mCacheStream.NotifyDataStarted(rangeStart);
mOffset = rangeStart;
// We received 'Content-Range', so the server accepts range requests.
acceptsRanges = true;
} else if (((mOffset > 0) || !mByteRange.IsNull())
&& (responseStatus == HTTP_OK_CODE)) {
// If we get an OK response but we were seeking, or requesting a byte
// range, then 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.
int64_t 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->SetTransportSeekable(seekable);
mCacheStream.SetTransportSeekable(seekable);
{
MutexAutoLock lock(mLock);
mChannelStatistics->Start();
}
mReopenOnError = false;
// If we are seeking to get metadata, because we are playing an OGG file,
// ignore if the channel gets closed without us suspending it explicitly. We
// don't want to tell the element that the download has finished whereas we
// just happended to have reached the end of the media while seeking.
mIgnoreClose = mSeekingForMetadata;
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::ParseContentRangeHeader(nsIHttpChannel * aHttpChan,
int64_t& aRangeStart,
int64_t& aRangeEnd,
int64_t& aRangeTotal)
{
NS_ENSURE_ARG(aHttpChan);
nsAutoCString rangeStr;
nsresult rv = aHttpChan->GetResponseHeader(NS_LITERAL_CSTRING("Content-Range"),
rangeStr);
NS_ENSURE_SUCCESS(rv, rv);
NS_ENSURE_FALSE(rangeStr.IsEmpty(), NS_ERROR_ILLEGAL_VALUE);
// Parse the range header: e.g. Content-Range: bytes 7000-7999/8000.
int32_t spacePos = rangeStr.Find(NS_LITERAL_CSTRING(" "));
int32_t dashPos = rangeStr.Find(NS_LITERAL_CSTRING("-"), true, spacePos);
int32_t slashPos = rangeStr.Find(NS_LITERAL_CSTRING("/"), true, dashPos);
nsAutoCString aRangeStartText;
rangeStr.Mid(aRangeStartText, spacePos+1, dashPos-(spacePos+1));
aRangeStart = aRangeStartText.ToInteger64(&rv);
NS_ENSURE_SUCCESS(rv, rv);
NS_ENSURE_TRUE(0 <= aRangeStart, NS_ERROR_ILLEGAL_VALUE);
nsAutoCString aRangeEndText;
rangeStr.Mid(aRangeEndText, dashPos+1, slashPos-(dashPos+1));
aRangeEnd = aRangeEndText.ToInteger64(&rv);
NS_ENSURE_SUCCESS(rv, rv);
NS_ENSURE_TRUE(aRangeStart < aRangeEnd, NS_ERROR_ILLEGAL_VALUE);
nsAutoCString aRangeTotalText;
rangeStr.Right(aRangeTotalText, rangeStr.Length()-(slashPos+1));
if (aRangeTotalText[0] == '*') {
aRangeTotal = -1;
} else {
aRangeTotal = aRangeTotalText.ToInteger64(&rv);
NS_ENSURE_TRUE(aRangeEnd < aRangeTotal, NS_ERROR_ILLEGAL_VALUE);
NS_ENSURE_SUCCESS(rv, rv);
}
CMLOG("Received bytes [%lld] to [%lld] of [%lld] for decoder[%p]",
aRangeStart, aRangeEnd, aRangeTotal, mDecoder);
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();
}
// If we were loading a byte range, notify decoder and return.
// Skip this for unterminated byte range requests, e.g. seeking for whole
// file downloads.
if (mByteRangeDownloads) {
mDecoder->NotifyDownloadEnded(aStatus);
return NS_OK;
}
// 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.IsTransportSeekable())) {
// 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,
uint32_t 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,
uint32_t aToOffset,
uint32_t aCount,
uint32_t *aWriteCount)
{
CopySegmentClosure* closure = static_cast<CopySegmentClosure*>(aClosure);
closure->mResource->mDecoder->NotifyDataArrived(aFromSegment, aCount, closure->mResource->mOffset);
// For byte range downloads controlled by |DASHDecoder|, there are cases in
// which the reader's offset is different enough from the channel offset that
// |MediaCache| requests a |CacheClientSeek| to the reader's offset. This
// can happen between calls to |CopySegmentToCache|. To avoid copying at
// incorrect offsets, ensure |MediaCache| copies to the location that
// |ChannelMediaResource| expects.
if (closure->mResource->mByteRangeDownloads) {
closure->mResource->mCacheStream.NotifyDataStarted(closure->mResource->mOffset);
}
// Keep track of where we're up to.
LOG("%p [ChannelMediaResource]: CopySegmentToCache at mOffset [%lld] add "
"[%d] bytes for decoder[%p]",
closure->mResource, closure->mResource->mOffset, aCount,
closure->mResource->mDecoder);
closure->mResource->mOffset += aCount;
closure->mResource->mCacheStream.NotifyDataReceived(aCount, aFromSegment,
closure->mPrincipal);
*aWriteCount = aCount;
return NS_OK;
}
nsresult
ChannelMediaResource::OnDataAvailable(nsIRequest* aRequest,
nsIInputStream* aStream,
uint32_t 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;
uint32_t count = aCount;
while (count > 0) {
uint32_t read;
nsresult rv = aStream->ReadSegments(CopySegmentToCache, &closure, count,
&read);
if (NS_FAILED(rv))
return rv;
NS_ASSERTION(read > 0, "Read 0 bytes while data was available?");
count -= read;
}
return NS_OK;
}
/* |OpenByteRange|
* For terminated byte range requests, use this function.
* Callback is |MediaDecoder|::|NotifyByteRangeDownloaded|().
* See |CacheClientSeek| also.
*/
nsresult
ChannelMediaResource::OpenByteRange(nsIStreamListener** aStreamListener,
MediaByteRange const & aByteRange)
{
NS_ASSERTION(NS_IsMainThread(), "Only call on main thread");
mByteRangeDownloads = true;
mByteRange = aByteRange;
// OpenByteRange may be called multiple times; same URL, different ranges.
// For the first call using this URL, forward to Open for some init.
if (mByteRangeFirstOpen) {
mByteRangeFirstOpen = false;
return Open(aStreamListener);
}
// For subsequent calls, ensure channel is recreated with correct byte range.
CloseChannel();
nsresult rv = RecreateChannel();
NS_ENSURE_SUCCESS(rv, rv);
return OpenChannel(aStreamListener);
}
nsresult ChannelMediaResource::Open(nsIStreamListener **aStreamListener)
{
NS_ASSERTION(NS_IsMainThread(), "Only call on main thread");
if (!mChannelStatistics) {
mChannelStatistics = new MediaChannelStatistics();
}
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 = nullptr;
}
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.
MediaDecoderOwner* owner = mDecoder->GetMediaOwner();
NS_ENSURE_TRUE(owner, NS_ERROR_FAILURE);
nsHTMLMediaElement* element = owner->GetMediaElement();
NS_ENSURE_TRUE(element, NS_ERROR_FAILURE);
if (element->ShouldCheckAllowOrigin()) {
nsRefPtr<nsCORSListenerProxy> crossSiteListener =
new nsCORSListenerProxy(mListener,
element->NodePrincipal(),
false);
nsresult rv = crossSiteListener->Init(mChannel);
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, nullptr);
NS_ENSURE_SUCCESS(rv, rv);
// Tell the media element that we are fetching data from a channel.
element->DownloadResumed(true);
}
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) {
// Use |mByteRange| for a specific chunk, or |mOffset| if seeking in a
// complete file download.
nsAutoCString rangeString("bytes=");
if (!mByteRange.IsNull()) {
rangeString.AppendInt(mByteRange.mStart);
mOffset = mByteRange.mStart;
} else {
rangeString.AppendInt(mOffset);
}
rangeString.Append("-");
if (!mByteRange.IsNull()) {
rangeString.AppendInt(mByteRange.mEnd);
}
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");
MediaDecoderOwner* owner = mDecoder->GetMediaOwner();
if (!owner) {
return;
}
nsHTMLMediaElement* element = owner->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(MediaDecoder* aDecoder)
{
NS_ASSERTION(NS_IsMainThread(), "Only call on main thread");
NS_ASSERTION(mCacheStream.IsAvailableForSharing(), "Stream can't be cloned");
ChannelMediaResource* resource = new ChannelMediaResource(aDecoder, nullptr, 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 = new MediaChannelStatistics(mChannelStatistics);
resource->mChannelStatistics->Stop();
}
return resource;
}
void ChannelMediaResource::CloseChannel()
{
NS_ASSERTION(NS_IsMainThread(), "Only call on main thread");
{
MutexAutoLock lock(mLock);
mChannelStatistics->Stop();
}
if (mListener) {
mListener->Revoke();
mListener = nullptr;
}
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 nsDocumentViewer::LoadComplete if our channel is the one
// that kicked off creation of a video document. We don't want that
// document load to think there was an error.
// NS_ERROR_PARSED_DATA_CACHED is the best thing we have for that
// at the moment.
mChannel->Cancel(NS_ERROR_PARSED_DATA_CACHED);
mChannel = nullptr;
}
}
nsresult ChannelMediaResource::ReadFromCache(char* aBuffer,
int64_t aOffset,
uint32_t aCount)
{
return mCacheStream.ReadFromCache(aBuffer, aOffset, aCount);
}
nsresult ChannelMediaResource::Read(char* aBuffer,
uint32_t aCount,
uint32_t* aBytes)
{
NS_ASSERTION(!NS_IsMainThread(), "Don't call on main thread");
return mCacheStream.Read(aBuffer, aCount, aBytes);
}
nsresult ChannelMediaResource::Seek(int32_t aWhence, int64_t aOffset)
{
NS_ASSERTION(!NS_IsMainThread(), "Don't call on main thread");
CMLOG("Seek requested for aOffset [%lld] for decoder [%p]",
aOffset, mDecoder);
// Remember |aOffset|, because Media Cache may request a diff offset later.
if (mByteRangeDownloads) {
ReentrantMonitorAutoEnter mon(mSeekOffsetMonitor);
mSeekOffset = aOffset;
}
return mCacheStream.Seek(aWhence, aOffset);
}
void ChannelMediaResource::StartSeekingForMetadata()
{
mSeekingForMetadata = true;
}
void ChannelMediaResource::EndSeekingForMetadata()
{
mSeekingForMetadata = false;
}
int64_t 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");
MediaDecoderOwner* owner = mDecoder->GetMediaOwner();
if (!owner) {
// Shutting down; do nothing.
return;
}
nsHTMLMediaElement* element = owner->GetMediaElement();
if (!element) {
// Shutting down; do nothing.
return;
}
if (mChannel) {
if (aCloseImmediately && mCacheStream.IsTransportSeekable()) {
// 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();
}
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!");
MediaDecoderOwner* owner = mDecoder->GetMediaOwner();
if (!owner) {
// Shutting down; do nothing.
return;
}
nsHTMLMediaElement* element = owner->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();
}
// 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 {
int64_t 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);
MediaDecoderOwner* owner = mDecoder->GetMediaOwner();
if (!owner) {
// The decoder is being shut down, so don't bother opening a new channel
return NS_OK;
}
nsHTMLMediaElement* element = owner->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);
nsresult rv = NS_NewChannel(getter_AddRefs(mChannel),
mURI,
nullptr,
loadGroup,
nullptr,
loadFlags);
// We have cached the Content-Type, which should not change. Give a hint to
// the channel to avoid a sniffing failure, which would be expected because we
// are probably seeking in the middle of the bitstream, and sniffing relies
// on the presence of a magic number at the beginning of the stream.
nsAutoCString contentType;
element->GetMimeType(contentType);
NS_ASSERTION(!contentType.IsEmpty(),
"When recreating a channel, we should know the Content-Type.");
mChannel->SetContentType(contentType);
return rv;
}
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(MediaDecoder* aDecoder, nsresult aStatus) :
mDecoder(aDecoder), mStatus(aStatus) {}
NS_IMETHOD Run() {
mDecoder->NotifyDownloadEnded(mStatus);
return NS_OK;
}
private:
nsRefPtr<MediaDecoder> 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);
}
void
ChannelMediaResource::CacheClientNotifyPrincipalChanged()
{
NS_ASSERTION(NS_IsMainThread(), "Don't call on non-main thread");
mDecoder->NotifyPrincipalChanged();
}
nsresult
ChannelMediaResource::CacheClientSeek(int64_t aOffset, bool aResume)
{
NS_ASSERTION(NS_IsMainThread(), "Don't call on non-main thread");
CMLOG("CacheClientSeek requested for aOffset [%lld] for decoder [%p]",
aOffset, mDecoder);
// |CloseChannel| immediately for non-byte-range downloads.
if (!mByteRangeDownloads) {
CloseChannel();
} else if (mChannel) {
// Only close byte range channels if they are not in pending state.
bool isPending = false;
nsresult rv = mChannel->IsPending(&isPending);
NS_ENSURE_SUCCESS(rv, rv);
if (!isPending) {
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;
}
// Note: For chunked downloads, e.g. DASH, we need to determine which chunk
// contains the requested offset, |mOffset|. This is either previously
// requested in |Seek| or updated to the most recent bytes downloaded.
// So the process below is:
// 1 - Query decoder for chunk containing desired offset, |mOffset|.
// Return silently if the offset is not available; suggests decoder is
// yet to get range information.
// Return with NetworkError for all other errors.
//
// 2 - Adjust |mByteRange|.mStart to |aOffset|, requested by media cache.
// For seeking, the media cache always requests the start of the cache
// block, so we need to adjust the first chunk of a seek.
// E.g. For "DASH-WebM On Demand" this means the first chunk after
// seeking will most likely be larger than the subsegment (cluster).
//
// 3 - Call |OpenByteRange| requesting |mByteRange| bytes.
if (mByteRangeDownloads) {
// Query decoder for chunk containing desired offset.
nsresult rv;
{
ReentrantMonitorAutoEnter mon(mSeekOffsetMonitor);
// Only continue with seek request if a prior call to |Seek| was made.
// If |Seek| was not called previously, it means the media cache is
// seeking on its own.
// E.g. For those WebM files which are encoded with cues at the end of
// the file, when the cues are parsed, the reader and media cache
// automatically return to the first offset not downloaded, normally the
// first byte after init data. This results in |MediaCache| requesting
// |aOffset| = 0 (aligning to the start of the cache block. Ignore this
// and let |DASHDecoder| decide which bytes to download and when.
if (mSeekOffset >= 0) {
rv = mDecoder->GetByteRangeForSeek(mSeekOffset, mByteRange);
// Cache may try to seek from the next uncached byte: this offset may
// be after the byte range being seeked, i.e. the range containing
// |mSeekOffset|, which is the offset actually requested by the reader.
// This case means that the seeked range is already cached. For byte
// range downloads, we do not permit the cache to request bytes outside
// the seeked range. Instead, the decoder is responsible for
// controlling the sequence of byte range downloads. As such, return
// silently, and do NOT request a new download.
if (NS_SUCCEEDED(rv) && !mByteRange.IsNull() &&
aOffset > mByteRange.mEnd) {
rv = NS_ERROR_NOT_AVAILABLE;
mByteRange.Clear();
}
mSeekOffset = -1;
} else if (mByteRange.mStart <= aOffset && aOffset <= mByteRange.mEnd) {
CMLOG("Trying to resume download at offset [%lld].", aOffset);
rv = NS_OK;
} else {
CMLOG("MediaCache [%p] trying to seek independently to offset [%lld].",
&mCacheStream, aOffset);
rv = NS_ERROR_NOT_AVAILABLE;
}
}
if (rv == NS_ERROR_NOT_AVAILABLE) {
// Decoder will not make byte ranges available for non-active streams, or
// if range information is not yet available, or for metadata bytes if
// they have already been downloaded and read. In all cases, it is ok to
// return silently and assume that the decoder will request the correct
// byte range when range information becomes available.
CMLOG("Byte range not available for decoder [%p]; returning "
"silently.", mDecoder);
return NS_OK;
} else if (NS_FAILED(rv) || mByteRange.IsNull()) {
// Decoder reported an error we don't want to handle here; just return.
CMLOG("Error getting byte range: seek offset[%lld] cache offset[%lld] "
"decoder[%p]", mSeekOffset, aOffset, mDecoder);
mDecoder->NetworkError();
CloseChannel();
return rv;
}
// Adjust the byte range to start where the media cache requested.
mByteRange.mStart = mOffset = aOffset;
return OpenByteRange(nullptr, mByteRange);
}
mOffset = aOffset;
if (mSuspendCount > 0) {
// Close the existing channel to force the channel to be recreated at
// the correct offset upon resume.
if (mChannel) {
mIgnoreClose = true;
CloseChannel();
}
return NS_OK;
}
nsresult rv = RecreateChannel();
if (NS_FAILED(rv))
return rv;
return OpenChannel(nullptr);
}
void
ChannelMediaResource::FlushCache()
{
NS_ASSERTION(NS_IsMainThread(), "Should be on main thread.");
// Ensure that data in the cache's partial block is written to disk.
mCacheStream.FlushPartialBlock();
}
void
ChannelMediaResource::NotifyLastByteRange()
{
NS_ASSERTION(NS_IsMainThread(), "Should be on main thread.");
// Tell media cache that the last data has been downloaded.
// Note: subsequent seeks will require re-opening the channel etc.
mCacheStream.NotifyDataEnded(NS_OK);
}
nsresult
ChannelMediaResource::CacheClientSuspend()
{
Suspend(false);
mDecoder->NotifySuspendedStatusChanged();
return NS_OK;
}
nsresult
ChannelMediaResource::CacheClientResume()
{
Resume();
mDecoder->NotifySuspendedStatusChanged();
return NS_OK;
}
int64_t
ChannelMediaResource::GetNextCachedData(int64_t aOffset)
{
return mCacheStream.GetNextCachedData(aOffset);
}
int64_t
ChannelMediaResource::GetCachedDataEnd(int64_t aOffset)
{
return mCacheStream.GetCachedDataEnd(aOffset);
}
bool
ChannelMediaResource::IsDataCachedToEndOfResource(int64_t aOffset)
{
return mCacheStream.IsDataCachedToEndOfStream(aOffset);
}
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(MediaCacheStream::ReadMode aMode)
{
mCacheStream.SetReadMode(aMode);
}
void
ChannelMediaResource::SetPlaybackRate(uint32_t aBytesPerSecond)
{
mCacheStream.SetPlaybackRate(aBytesPerSecond);
}
void
ChannelMediaResource::Pin()
{
mCacheStream.Pin();
}
void
ChannelMediaResource::Unpin()
{
mCacheStream.Unpin();
}
double
ChannelMediaResource::GetDownloadRate(bool* aIsReliable)
{
MutexAutoLock lock(mLock);
return mChannelStatistics->GetRate(aIsReliable);
}
int64_t
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 BaseMediaResource
{
public:
FileMediaResource(MediaDecoder* aDecoder, nsIChannel* aChannel, nsIURI* aURI) :
BaseMediaResource(aDecoder, aChannel, aURI),
mSize(-1),
mLock("FileMediaResource.mLock"),
mSizeInitialized(false)
{
}
~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(MediaDecoder* aDecoder);
virtual nsresult ReadFromCache(char* aBuffer, int64_t aOffset, uint32_t aCount);
// These methods are called off the main thread.
// Other thread
virtual void SetReadMode(MediaCacheStream::ReadMode aMode) {}
virtual void SetPlaybackRate(uint32_t aBytesPerSecond) {}
virtual nsresult Read(char* aBuffer, uint32_t aCount, uint32_t* aBytes);
virtual nsresult Seek(int32_t aWhence, int64_t aOffset);
virtual void StartSeekingForMetadata() {};
virtual void EndSeekingForMetadata() {};
virtual int64_t 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 int64_t GetLength() {
MutexAutoLock lock(mLock);
EnsureSizeInitialized();
return mSizeInitialized ? mSize : 0;
}
virtual int64_t GetNextCachedData(int64_t aOffset)
{
MutexAutoLock lock(mLock);
EnsureSizeInitialized();
return (aOffset < mSize) ? aOffset : -1;
}
virtual int64_t GetCachedDataEnd(int64_t aOffset) {
MutexAutoLock lock(mLock);
EnsureSizeInitialized();
return std::max(aOffset, mSize);
}
virtual bool IsDataCachedToEndOfResource(int64_t aOffset) { return true; }
virtual bool IsSuspendedByCache(MediaResource** aActiveResource)
{
if (aActiveResource) {
*aActiveResource = nullptr;
}
return false;
}
virtual bool IsSuspended() { return false; }
nsresult GetCachedRanges(nsTArray<MediaByteRange>& aRanges);
private:
// Ensures mSize is initialized, if it can be.
// mLock must be held when this is called, and mInput must be non-null.
void EnsureSizeInitialized();
// The file size, or -1 if not known. Immutable after Open().
// Can be used from any thread.
int64_t 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, mInput, mSize, and mSizeInitialized.
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;
// Whether we've attempted to initialize mSize. Note that mSize can be -1
// when mSizeInitialized is true if we tried and failed to get the size
// of the file.
bool mSizeInitialized;
};
class LoadedEvent : public nsRunnable
{
public:
LoadedEvent(MediaDecoder* aDecoder) :
mDecoder(aDecoder)
{
MOZ_COUNT_CTOR(LoadedEvent);
}
~LoadedEvent()
{
MOZ_COUNT_DTOR(LoadedEvent);
}
NS_IMETHOD Run() {
mDecoder->NotifyDownloadEnded(NS_OK);
return NS_OK;
}
private:
nsRefPtr<MediaDecoder> mDecoder;
};
void FileMediaResource::EnsureSizeInitialized()
{
mLock.AssertCurrentThreadOwns();
NS_ASSERTION(mInput, "Must have file input stream");
if (mSizeInitialized) {
return;
}
mSizeInitialized = true;
// Get the file size and inform the decoder.
uint64_t size;
nsresult res = mInput->Available(&size);
if (NS_SUCCEEDED(res) && size <= INT64_MAX) {
mSize = (int64_t)size;
nsCOMPtr<nsIRunnable> event = new LoadedEvent(mDecoder);
NS_DispatchToMainThread(event, NS_DISPATCH_NORMAL);
}
}
nsresult FileMediaResource::GetCachedRanges(nsTArray<MediaByteRange>& aRanges)
{
MutexAutoLock lock(mLock);
EnsureSizeInitialized();
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 = nullptr;
}
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) {
nsCOMPtr<nsIFile> file;
rv = fc->GetFile(getter_AddRefs(file));
NS_ENSURE_SUCCESS(rv, rv);
rv = NS_NewLocalFileInputStream(getter_AddRefs(mInput), file);
} else if (IsBlobURI(mURI)) {
rv = NS_GetStreamForBlobURI(mURI, getter_AddRefs(mInput));
}
} else {
// Ensure that we never load a local file from some page on a
// web server.
MediaDecoderOwner* owner = mDecoder->GetMediaOwner();
NS_ENSURE_TRUE(owner, NS_ERROR_FAILURE);
nsHTMLMediaElement* element = owner->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;
}
return NS_OK;
}
nsresult FileMediaResource::Close()
{
NS_ASSERTION(NS_IsMainThread(), "Only call on main thread");
// Since mChennel is only accessed by main thread, there is no necessary to
// take the lock.
if (mChannel) {
mChannel->Cancel(NS_ERROR_PARSED_DATA_CACHED);
mChannel = nullptr;
}
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 nullptr;
secMan->GetChannelPrincipal(mChannel, getter_AddRefs(principal));
return principal.forget();
}
bool FileMediaResource::CanClone()
{
return true;
}
MediaResource* FileMediaResource::CloneData(MediaDecoder* aDecoder)
{
NS_ASSERTION(NS_IsMainThread(), "Only call on main thread");
MediaDecoderOwner* owner = mDecoder->GetMediaOwner();
if (!owner) {
// The decoder is being shut down, so we can't clone
return nullptr;
}
nsHTMLMediaElement* element = owner->GetMediaElement();
if (!element) {
// The decoder is being shut down, so we can't clone
return nullptr;
}
nsCOMPtr<nsILoadGroup> loadGroup = element->GetDocumentLoadGroup();
NS_ENSURE_TRUE(loadGroup, nullptr);
nsCOMPtr<nsIChannel> channel;
nsresult rv =
NS_NewChannel(getter_AddRefs(channel), mURI, nullptr, loadGroup, nullptr, 0);
if (NS_FAILED(rv))
return nullptr;
return new FileMediaResource(aDecoder, channel, mURI);
}
nsresult FileMediaResource::ReadFromCache(char* aBuffer, int64_t aOffset, uint32_t aCount)
{
MutexAutoLock lock(mLock);
EnsureSizeInitialized();
int64_t 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);
uint32_t bytesRead = 0;
do {
uint32_t x = 0;
uint32_t 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, uint32_t aCount, uint32_t* aBytes)
{
MutexAutoLock lock(mLock);
EnsureSizeInitialized();
return mInput->Read(aBuffer, aCount, aBytes);
}
nsresult FileMediaResource::Seek(int32_t aWhence, int64_t aOffset)
{
NS_ASSERTION(!NS_IsMainThread(), "Don't call on main thread");
MutexAutoLock lock(mLock);
if (!mSeekable)
return NS_ERROR_FAILURE;
EnsureSizeInitialized();
return mSeekable->Seek(aWhence, aOffset);
}
int64_t FileMediaResource::Tell()
{
NS_ASSERTION(!NS_IsMainThread(), "Don't call on main thread");
MutexAutoLock lock(mLock);
if (!mSeekable)
return 0;
EnsureSizeInitialized();
int64_t offset = 0;
mSeekable->Tell(&offset);
return offset;
}
MediaResource*
MediaResource::Create(MediaDecoder* 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, nullptr);
nsCOMPtr<nsIFileChannel> fc = do_QueryInterface(aChannel);
if (fc || IsBlobURI(uri)) {
return new FileMediaResource(aDecoder, aChannel, uri);
}
return new ChannelMediaResource(aDecoder, aChannel, uri);
}
void BaseMediaResource::MoveLoadsToBackground() {
NS_ASSERTION(!mLoadInBackground, "Why are you calling this more than once?");
mLoadInBackground = true;
if (!mChannel) {
// No channel, resource is probably already loaded.
return;
}
MediaDecoderOwner* owner = mDecoder->GetMediaOwner();
if (!owner) {
NS_WARNING("Null owner in MediaResource::MoveLoadsToBackground()");
return;
}
nsHTMLMediaElement* element = owner->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 BaseMediaResource::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, nullptr, 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, nullptr);
NS_ASSERTION(NS_SUCCEEDED(rv), "AddRequest() failed!");
}
}
} // namespace mozilla
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