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-rw-r--r--dom/media/EncodedBufferCache.h63
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diff --git a/dom/media/EncodedBufferCache.h b/dom/media/EncodedBufferCache.h
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+/* -*- 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 EncodedBufferCache_h_
+#define EncodedBufferCache_h_
+
+#include "nsCOMPtr.h"
+#include "nsTArray.h"
+#include "mozilla/Mutex.h"
+
+struct PRFileDesc;
+
+namespace mozilla {
+
+namespace dom {
+class Blob;
+} // namespace dom
+
+/**
+ * Data is moved into a temporary file when it grows beyond
+ * the maximal size passed in the Init function.
+ * The AppendBuffer and ExtractBlob methods are thread-safe and can be called on
+ * different threads at the same time.
+ */
+class EncodedBufferCache
+{
+public:
+ explicit EncodedBufferCache(uint32_t aMaxMemoryStorage)
+ : mFD(nullptr),
+ mMutex("EncodedBufferCache.Data.Mutex"),
+ mDataSize(0),
+ mMaxMemoryStorage(aMaxMemoryStorage),
+ mTempFileEnabled(false) { }
+ ~EncodedBufferCache()
+ {
+ }
+ // Append buffers in cache, check if the queue is too large then switch to write buffer to file system
+ // aBuf will append to mEncodedBuffers or temporary File, aBuf also be cleared
+ void AppendBuffer(nsTArray<uint8_t> & aBuf);
+ // Read all buffer from memory or file System, also Remove the temporary file or clean the buffers in memory.
+ already_AddRefed<dom::Blob> ExtractBlob(nsISupports* aParent, const nsAString &aContentType);
+
+private:
+ //array for storing the encoded data.
+ nsTArray<nsTArray<uint8_t> > mEncodedBuffers;
+ // File handle for the temporary file
+ PRFileDesc* mFD;
+ // Used to protect the mEncodedBuffer for avoiding AppendBuffer/Consume on different thread at the same time.
+ Mutex mMutex;
+ // the current buffer size can be read
+ uint64_t mDataSize;
+ // The maximal buffer allowed in memory
+ uint32_t mMaxMemoryStorage;
+ // indicate the buffer is stored on temporary file or not
+ bool mTempFileEnabled;
+};
+
+} // namespace mozilla
+
+#endif