gecko/content/media/WebVTTLoadListener.cpp

173 lines
4.7 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 "WebVTTLoadListener.h"
#include "mozilla/dom/TextTrackCue.h"
#include "mozilla/dom/HTMLTrackElement.h"
namespace mozilla {
namespace dom {
NS_IMPL_CYCLE_COLLECTION_1(WebVTTLoadListener, mElement)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(WebVTTLoadListener)
NS_INTERFACE_MAP_ENTRY(nsIStreamListener)
NS_INTERFACE_MAP_ENTRY(nsIChannelEventSink)
NS_INTERFACE_MAP_ENTRY(nsIInterfaceRequestor)
NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIStreamListener)
NS_INTERFACE_MAP_END
NS_IMPL_CYCLE_COLLECTING_ADDREF(WebVTTLoadListener)
NS_IMPL_CYCLE_COLLECTING_RELEASE(WebVTTLoadListener)
#ifdef PR_LOGGING
PRLogModuleInfo* gTextTrackLog;
# define LOG(...) PR_LOG(gTextTrackLog, PR_LOG_DEBUG, (__VA_ARGS__))
#else
# define LOG(msg)
#endif
WebVTTLoadListener::WebVTTLoadListener(HTMLTrackElement* aElement)
: mElement(aElement)
{
MOZ_ASSERT(mElement, "Must pass an element to the callback");
#ifdef PR_LOGGING
if (!gTextTrackLog) {
gTextTrackLog = PR_NewLogModule("TextTrack");
}
#endif
LOG("WebVTTLoadListener created.");
}
WebVTTLoadListener::~WebVTTLoadListener()
{
LOG("WebVTTLoadListener destroyed.");
}
nsresult
WebVTTLoadListener::LoadResource()
{
if (!HTMLTrackElement::IsWebVTTEnabled()) {
NS_WARNING("WebVTT support disabled."
" See media.webvtt.enabled in about:config. ");
return NS_ERROR_FAILURE;
}
LOG("Loading text track resource.");
webvtt_parser_t* parser = nullptr;
// Create parser here.
mParser.own(parser);
NS_ENSURE_TRUE(mParser != nullptr, NS_ERROR_FAILURE);
mElement->mReadyState = HTMLTrackElement::LOADING;
return NS_OK;
}
NS_IMETHODIMP
WebVTTLoadListener::OnStartRequest(nsIRequest* aRequest,
nsISupports* aContext)
{
return NS_OK;
}
NS_IMETHODIMP
WebVTTLoadListener::OnStopRequest(nsIRequest* aRequest,
nsISupports* aContext,
nsresult aStatus)
{
// Flush parser here.
if(mElement->mReadyState != HTMLTrackElement::ERROR) {
mElement->mReadyState = HTMLTrackElement::LOADED;
}
return NS_OK;
}
NS_IMETHODIMP
WebVTTLoadListener::OnDataAvailable(nsIRequest* aRequest,
nsISupports* aContext,
nsIInputStream* aStream,
uint64_t aOffset,
uint32_t aCount)
{
uint32_t count = aCount;
while (count > 0) {
uint32_t read;
nsresult rv = aStream->ReadSegments(ParseChunk, this, count, &read);
NS_ENSURE_SUCCESS(rv, rv);
if (!read) {
return NS_ERROR_FAILURE;
}
count -= read;
}
return NS_OK;
}
NS_IMETHODIMP
WebVTTLoadListener::AsyncOnChannelRedirect(nsIChannel* aOldChannel,
nsIChannel* aNewChannel,
uint32_t aFlags,
nsIAsyncVerifyRedirectCallback* cb)
{
if (mElement) {
mElement->OnChannelRedirect(aOldChannel, aNewChannel, aFlags);
}
return NS_OK;
}
NS_IMETHODIMP
WebVTTLoadListener::GetInterface(const nsIID &aIID,
void** aResult)
{
return QueryInterface(aIID, aResult);
}
NS_METHOD
WebVTTLoadListener::ParseChunk(nsIInputStream* aInStream, void* aClosure,
const char* aFromSegment, uint32_t aToOffset,
uint32_t aCount, uint32_t* aWriteCount)
{
//WebVTTLoadListener* loadListener = static_cast<WebVTTLoadListener*>(aClosure);
// Call parser incrementally on new data.
if (1) {
LOG("WebVTT parser disabled.");
LOG("Unable to parse chunk of WEBVTT text. Aborting.");
*aWriteCount = 0;
return NS_ERROR_FAILURE;
}
*aWriteCount = aCount;
return NS_OK;
}
void
WebVTTLoadListener::OnParsedCue(webvtt_cue* aCue)
{
nsRefPtr<TextTrackCue> textTrackCue;
// Create a new textTrackCue here.
// Copy settings from the parsed cue here.
mElement->mTrack->AddCue(*textTrackCue);
}
int
WebVTTLoadListener::OnReportError(uint32_t aLine, uint32_t aCol,
webvtt_error aError)
{
#ifdef PR_LOGGING
// Get source webvtt file to display in the log
DOMString wideFile;
mElement->GetSrc(wideFile);
NS_ConvertUTF16toUTF8 file(wideFile);
const char* error = "parser error";
LOG("error: %s(%d:%d) - %s\n", file.get(), aLine, aCol, error);
#endif
return 0;
}
} // namespace dom
} // namespace mozilla