Add m-esr52 at 52.6.0

1 files changed, 107 insertions, 0 deletions

diff --git a/dom/media/fmp4/MP4Stream.h b/dom/media/fmp4/MP4Stream.h
new file mode 100644
index 000000000..d7d8e6afc
--- /dev/null
+++ b/dom/media/fmp4/MP4Stream.h
@@ -0,0 +1,107 @@
+/* -*- 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/. */
+
+#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