gecko-dev/dom/media/EncodedBufferCache.cpp

77 строки
2.4 KiB
C++

/* -*- 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 "EncodedBufferCache.h"
#include "mozilla/dom/File.h"
#include "nsAnonymousTemporaryFile.h"
#include "prio.h"
namespace mozilla {
void
EncodedBufferCache::AppendBuffer(nsTArray<uint8_t> & aBuf)
{
MutexAutoLock lock(mMutex);
mDataSize += aBuf.Length();
mEncodedBuffers.AppendElement()->SwapElements(aBuf);
if (!mTempFileEnabled && mDataSize > mMaxMemoryStorage) {
nsresult rv = NS_OpenAnonymousTemporaryFile(&mFD);
if (!NS_FAILED(rv)) {
mTempFileEnabled = true;
}
}
if (mTempFileEnabled) {
// has created temporary file, write buffer in it
for (uint32_t i = 0; i < mEncodedBuffers.Length(); i++) {
int32_t amount = PR_Write(mFD, mEncodedBuffers.ElementAt(i).Elements(), mEncodedBuffers.ElementAt(i).Length());
if (amount < 0 || size_t(amount) < mEncodedBuffers.ElementAt(i).Length()) {
NS_WARNING("Failed to write media cache block!");
}
}
mEncodedBuffers.Clear();
}
}
already_AddRefed<dom::File>
EncodedBufferCache::ExtractBlob(nsISupports* aParent,
const nsAString &aContentType)
{
MutexAutoLock lock(mMutex);
nsRefPtr<dom::File> blob;
if (mTempFileEnabled) {
// generate new temporary file to write
blob = dom::File::CreateTemporaryFileBlob(aParent, mFD, 0, mDataSize,
aContentType);
// fallback to memory blob
mTempFileEnabled = false;
mDataSize = 0;
mFD = nullptr;
} else {
void* blobData = moz_malloc(mDataSize);
NS_ASSERTION(blobData, "out of memory!!");
if (blobData) {
for (uint32_t i = 0, offset = 0; i < mEncodedBuffers.Length(); i++) {
memcpy((uint8_t*)blobData + offset, mEncodedBuffers.ElementAt(i).Elements(),
mEncodedBuffers.ElementAt(i).Length());
offset += mEncodedBuffers.ElementAt(i).Length();
}
blob = dom::File::CreateMemoryFile(aParent, blobData, mDataSize,
aContentType);
mEncodedBuffers.Clear();
} else
return nullptr;
}
mDataSize = 0;
return blob.forget();
}
} //end namespace