101 lines
2.2 KiB
C++
101 lines
2.2 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim:set ts=2 sw=2 sts=2 et cindent: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "MP4Stream.h"
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#include "MediaResource.h"
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namespace mozilla {
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MP4Stream::MP4Stream(MediaResource* aResource)
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: mResource(aResource)
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, mPinCount(0)
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{
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MOZ_COUNT_CTOR(MP4Stream);
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MOZ_ASSERT(aResource);
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}
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MP4Stream::~MP4Stream()
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{
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MOZ_COUNT_DTOR(MP4Stream);
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MOZ_ASSERT(mPinCount == 0);
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}
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bool
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MP4Stream::BlockingReadIntoCache(int64_t aOffset, size_t aCount, Monitor* aToUnlock)
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{
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MOZ_ASSERT(mPinCount > 0);
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CacheBlock block(aOffset, aCount);
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if (!block.Init()) {
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return false;
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}
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uint32_t bytesRead = 0;
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{
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MonitorAutoUnlock unlock(*aToUnlock);
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nsresult rv = mResource.ReadAt(aOffset, block.Buffer(), aCount, &bytesRead);
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if (NS_FAILED(rv)) {
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return false;
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}
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}
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MOZ_ASSERT(block.mCount >= bytesRead);
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block.mCount = bytesRead;
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mCache.AppendElement(Move(block));
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return true;
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}
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bool
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MP4Stream::ReadAt(int64_t aOffset, void* aBuffer, size_t aCount,
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size_t* aBytesRead)
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{
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if (mFailedRead.isSome()) {
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mFailedRead.reset();
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}
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if (!CachedReadAt(aOffset, aBuffer, aCount, aBytesRead)) {
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mFailedRead.emplace(aOffset, aCount);
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return false;
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}
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return true;
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}
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bool
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MP4Stream::CachedReadAt(int64_t aOffset, void* aBuffer, size_t aCount,
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size_t* aBytesRead)
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{
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// First, check our local cache.
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for (size_t i = 0; i < mCache.Length(); ++i) {
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if (mCache[i].mOffset == aOffset && mCache[i].mCount >= aCount) {
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memcpy(aBuffer, mCache[i].Buffer(), aCount);
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*aBytesRead = aCount;
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return true;
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}
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}
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nsresult rv =
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mResource.GetResource()->ReadFromCache(reinterpret_cast<char*>(aBuffer),
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aOffset, aCount);
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if (NS_FAILED(rv)) {
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*aBytesRead = 0;
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return false;
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}
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*aBytesRead = aCount;
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return true;
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}
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bool
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MP4Stream::Length(int64_t* aSize)
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{
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if (mResource.GetLength() < 0)
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return false;
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*aSize = mResource.GetLength();
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return true;
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}
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} // namespace mozilla
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