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comparison: content/media/WebVTTListener.cpp
content/media/WebVTTListener.cpp
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| -1:000000000000 | 0:45200d4624f3 |
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| 1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ | |
| 2 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 3 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 5 | |
| 6 #include "WebVTTListener.h" | |
| 7 #include "mozilla/dom/TextTrackCue.h" | |
| 8 #include "mozilla/dom/TextTrackRegion.h" | |
| 9 #include "mozilla/dom/VTTRegionBinding.h" | |
| 10 #include "mozilla/dom/HTMLTrackElement.h" | |
| 11 #include "nsIInputStream.h" | |
| 12 #include "nsIWebVTTParserWrapper.h" | |
| 13 #include "nsComponentManagerUtils.h" | |
| 14 | |
| 15 namespace mozilla { | |
| 16 namespace dom { | |
| 17 | |
| 18 NS_IMPL_CYCLE_COLLECTION(WebVTTListener, mElement, mParserWrapper) | |
| 19 | |
| 20 NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(WebVTTListener) | |
| 21 NS_INTERFACE_MAP_ENTRY(nsIWebVTTListener) | |
| 22 NS_INTERFACE_MAP_ENTRY(nsIStreamListener) | |
| 23 NS_INTERFACE_MAP_ENTRY(nsIChannelEventSink) | |
| 24 NS_INTERFACE_MAP_ENTRY(nsIInterfaceRequestor) | |
| 25 NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIWebVTTListener) | |
| 26 NS_INTERFACE_MAP_END | |
| 27 | |
| 28 NS_IMPL_CYCLE_COLLECTING_ADDREF(WebVTTListener) | |
| 29 NS_IMPL_CYCLE_COLLECTING_RELEASE(WebVTTListener) | |
| 30 | |
| 31 #ifdef PR_LOGGING | |
| 32 PRLogModuleInfo* gTextTrackLog; | |
| 33 # define VTT_LOG(...) PR_LOG(gTextTrackLog, PR_LOG_DEBUG, (__VA_ARGS__)) | |
| 34 #else | |
| 35 # define VTT_LOG(msg) | |
| 36 #endif | |
| 37 | |
| 38 WebVTTListener::WebVTTListener(HTMLTrackElement* aElement) | |
| 39 : mElement(aElement) | |
| 40 { | |
| 41 MOZ_ASSERT(mElement, "Must pass an element to the callback"); | |
| 42 #ifdef PR_LOGGING | |
| 43 if (!gTextTrackLog) { | |
| 44 gTextTrackLog = PR_NewLogModule("TextTrack"); | |
| 45 } | |
| 46 #endif | |
| 47 VTT_LOG("WebVTTListener created."); | |
| 48 } | |
| 49 | |
| 50 WebVTTListener::~WebVTTListener() | |
| 51 { | |
| 52 VTT_LOG("WebVTTListener destroyed."); | |
| 53 } | |
| 54 | |
| 55 NS_IMETHODIMP | |
| 56 WebVTTListener::GetInterface(const nsIID &aIID, | |
| 57 void** aResult) | |
| 58 { | |
| 59 return QueryInterface(aIID, aResult); | |
| 60 } | |
| 61 | |
| 62 nsresult | |
| 63 WebVTTListener::LoadResource() | |
| 64 { | |
| 65 if (!HTMLTrackElement::IsWebVTTEnabled()) { | |
| 66 NS_WARNING("WebVTT support disabled." | |
| 67 " See media.webvtt.enabled in about:config. "); | |
| 68 return NS_ERROR_FAILURE; | |
| 69 } | |
| 70 nsresult rv; | |
| 71 mParserWrapper = do_CreateInstance(NS_WEBVTTPARSERWRAPPER_CONTRACTID, &rv); | |
| 72 NS_ENSURE_SUCCESS(rv, rv); | |
| 73 | |
| 74 nsPIDOMWindow* window = mElement->OwnerDoc()->GetWindow(); | |
| 75 rv = mParserWrapper->LoadParser(window); | |
| 76 NS_ENSURE_SUCCESS(rv, rv); | |
| 77 | |
| 78 rv = mParserWrapper->Watch(this); | |
| 79 NS_ENSURE_SUCCESS(rv, rv); | |
| 80 | |
| 81 mElement->SetReadyState(TextTrackReadyState::Loading); | |
| 82 return NS_OK; | |
| 83 } | |
| 84 | |
| 85 NS_IMETHODIMP | |
| 86 WebVTTListener::AsyncOnChannelRedirect(nsIChannel* aOldChannel, | |
| 87 nsIChannel* aNewChannel, | |
| 88 uint32_t aFlags, | |
| 89 nsIAsyncVerifyRedirectCallback* cb) | |
| 90 { | |
| 91 if (mElement) { | |
| 92 mElement->OnChannelRedirect(aOldChannel, aNewChannel, aFlags); | |
| 93 } | |
| 94 return NS_OK; | |
| 95 } | |
| 96 | |
| 97 NS_IMETHODIMP | |
| 98 WebVTTListener::OnStartRequest(nsIRequest* aRequest, | |
| 99 nsISupports* aContext) | |
| 100 { | |
| 101 return NS_OK; | |
| 102 } | |
| 103 | |
| 104 NS_IMETHODIMP | |
| 105 WebVTTListener::OnStopRequest(nsIRequest* aRequest, | |
| 106 nsISupports* aContext, | |
| 107 nsresult aStatus) | |
| 108 { | |
| 109 if (NS_FAILED(aStatus)) { | |
| 110 mElement->SetReadyState(TextTrackReadyState::FailedToLoad); | |
| 111 } | |
| 112 // Attempt to parse any final data the parser might still have. | |
| 113 mParserWrapper->Flush(); | |
| 114 if (mElement->ReadyState() != TextTrackReadyState::FailedToLoad) { | |
| 115 mElement->SetReadyState(TextTrackReadyState::Loaded); | |
| 116 } | |
| 117 return aStatus; | |
| 118 } | |
| 119 | |
| 120 NS_METHOD | |
| 121 WebVTTListener::ParseChunk(nsIInputStream* aInStream, void* aClosure, | |
| 122 const char* aFromSegment, uint32_t aToOffset, | |
| 123 uint32_t aCount, uint32_t* aWriteCount) | |
| 124 { | |
| 125 nsCString buffer(aFromSegment, aCount); | |
| 126 WebVTTListener* listener = static_cast<WebVTTListener*>(aClosure); | |
| 127 | |
| 128 if (NS_FAILED(listener->mParserWrapper->Parse(buffer))) { | |
| 129 VTT_LOG("Unable to parse chunk of WEBVTT text. Aborting."); | |
| 130 *aWriteCount = 0; | |
| 131 return NS_ERROR_FAILURE; | |
| 132 } | |
| 133 | |
| 134 *aWriteCount = aCount; | |
| 135 return NS_OK; | |
| 136 } | |
| 137 | |
| 138 NS_IMETHODIMP | |
| 139 WebVTTListener::OnDataAvailable(nsIRequest* aRequest, | |
| 140 nsISupports* aContext, | |
| 141 nsIInputStream* aStream, | |
| 142 uint64_t aOffset, | |
| 143 uint32_t aCount) | |
| 144 { | |
| 145 uint32_t count = aCount; | |
| 146 while (count > 0) { | |
| 147 uint32_t read; | |
| 148 nsresult rv = aStream->ReadSegments(ParseChunk, this, count, &read); | |
| 149 NS_ENSURE_SUCCESS(rv, rv); | |
| 150 if (!read) { | |
| 151 return NS_ERROR_FAILURE; | |
| 152 } | |
| 153 count -= read; | |
| 154 } | |
| 155 | |
| 156 return NS_OK; | |
| 157 } | |
| 158 | |
| 159 NS_IMETHODIMP | |
| 160 WebVTTListener::OnCue(JS::Handle<JS::Value> aCue, JSContext* aCx) | |
| 161 { | |
| 162 if (!aCue.isObject()) { | |
| 163 return NS_ERROR_FAILURE; | |
| 164 } | |
| 165 | |
| 166 TextTrackCue* cue; | |
| 167 nsresult rv = UNWRAP_OBJECT(VTTCue, &aCue.toObject(), cue); | |
| 168 NS_ENSURE_SUCCESS(rv, rv); | |
| 169 | |
| 170 cue->SetTrackElement(mElement); | |
| 171 mElement->mTrack->AddCue(*cue); | |
| 172 | |
| 173 return NS_OK; | |
| 174 } | |
| 175 | |
| 176 | |
| 177 NS_IMETHODIMP | |
| 178 WebVTTListener::OnRegion(JS::Handle<JS::Value> aRegion, JSContext* aCx) | |
| 179 { | |
| 180 // Nothing for this callback to do. | |
| 181 return NS_OK; | |
| 182 } | |
| 183 | |
| 184 NS_IMETHODIMP | |
| 185 WebVTTListener::OnParsingError(int32_t errorCode, JSContext* cx) | |
| 186 { | |
| 187 // We only care about files that have a bad WebVTT file signature right now | |
| 188 // as that means the file failed to load. | |
| 189 if (errorCode == ErrorCodes::BadSignature) { | |
| 190 mElement->SetReadyState(TextTrackReadyState::FailedToLoad); | |
| 191 } | |
| 192 return NS_OK; | |
| 193 } | |
| 194 | |
| 195 } // namespace dom | |
| 196 } // namespace mozilla |
