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/* -*- 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/. */
#ifndef MP4_STREAM_H_
#define MP4_STREAM_H_
#include "mp4_demuxer/Stream.h"
#include "MediaResource.h"
#include "mozilla/Maybe.h"
#include "mozilla/Monitor.h"
#include "mozilla/UniquePtrExtensions.h"
namespace mozilla {
class Monitor;
class MP4Stream : public mp4_demuxer::Stream {
public:
explicit MP4Stream(MediaResource* aResource);
virtual ~MP4Stream();
bool BlockingReadIntoCache(int64_t aOffset, size_t aCount, Monitor* aToUnlock);
bool ReadAt(int64_t aOffset, void* aBuffer, size_t aCount,
size_t* aBytesRead) override;
bool CachedReadAt(int64_t aOffset, void* aBuffer, size_t aCount,
size_t* aBytesRead) override;
bool Length(int64_t* aSize) override;
struct ReadRecord {
ReadRecord(int64_t aOffset, size_t aCount) : mOffset(aOffset), mCount(aCount) {}
bool operator==(const ReadRecord& aOther) { return mOffset == aOther.mOffset && mCount == aOther.mCount; }
int64_t mOffset;
size_t mCount;
};
bool LastReadFailed(ReadRecord* aOut)
{
if (mFailedRead.isSome()) {
*aOut = mFailedRead.ref();
return true;
}
return false;
}
void ClearFailedRead() { mFailedRead.reset(); }
void Pin()
{
mResource.GetResource()->Pin();
++mPinCount;
}
void Unpin()
{
mResource.GetResource()->Unpin();
MOZ_ASSERT(mPinCount);
--mPinCount;
if (mPinCount == 0) {
mCache.Clear();
}
}
private:
MediaResourceIndex mResource;
Maybe<ReadRecord> mFailedRead;
uint32_t mPinCount;
struct CacheBlock {
CacheBlock(int64_t aOffset, size_t aCount)
: mOffset(aOffset), mCount(aCount), mBuffer(nullptr) {}
int64_t mOffset;
size_t mCount;
CacheBlock(CacheBlock&& aOther)
: mOffset(aOther.mOffset)
, mCount(aOther.mCount)
, mBuffer(Move(aOther.mBuffer))
{}
bool Init()
{
mBuffer = MakeUniqueFallible<char[]>(mCount);
return !!mBuffer;
}
char* Buffer()
{
MOZ_ASSERT(mBuffer.get());
return mBuffer.get();
}
private:
CacheBlock(const CacheBlock&) = delete;
CacheBlock& operator=(const CacheBlock&) = delete;
UniquePtr<char[]> mBuffer;
};
nsTArray<CacheBlock> mCache;
};
} // namespace mozilla
#endif
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