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-rw-r--r--dom/media/mediasource/ResourceQueue.h88
1 files changed, 88 insertions, 0 deletions
diff --git a/dom/media/mediasource/ResourceQueue.h b/dom/media/mediasource/ResourceQueue.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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 MOZILLA_RESOURCEQUEUE_H_
+#define MOZILLA_RESOURCEQUEUE_H_
+
+#include "nsDeque.h"
+#include "MediaSpan.h"
+
+namespace mozilla {
+
+class ErrorResult;
+
+// A SourceBufferResource has a queue containing the data that is appended
+// to it. The queue holds instances of ResourceItem which is an array of the
+// bytes. Appending data to the SourceBufferResource pushes this onto the
+// queue.
+
+// Data is evicted once it reaches a size threshold. This pops the items off
+// the front of the queue and deletes it. If an eviction happens then the
+// MediaSource is notified (done in SourceBuffer::AppendData) which then
+// requests all SourceBuffers to evict data up to approximately the same
+// timepoint.
+
+struct ResourceItem {
+ ResourceItem(const MediaSpan& aData, uint64_t aOffset);
+ size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const;
+ MediaSpan mData;
+ uint64_t mOffset;
+};
+
+class ResourceQueue : private nsDeque<ResourceItem> {
+ public:
+ ResourceQueue();
+
+ // Returns the logical byte offset of the start of the data.
+ uint64_t GetOffset();
+
+ // Returns the length of all items in the queue plus the offset.
+ // This is the logical length of the resource.
+ uint64_t GetLength();
+
+ // Copies aCount bytes from aOffset in the queue into aDest.
+ void CopyData(uint64_t aOffset, uint32_t aCount, char* aDest);
+
+ void AppendItem(const MediaSpan& aData);
+
+ // Tries to evict at least aSizeToEvict from the queue up until
+ // aOffset. Returns amount evicted.
+ uint32_t Evict(uint64_t aOffset, uint32_t aSizeToEvict);
+
+ uint32_t EvictBefore(uint64_t aOffset);
+
+ uint32_t EvictAll();
+
+ size_t SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const;
+
+#if defined(DEBUG)
+ void Dump(const char* aPath);
+#endif
+
+ const uint8_t* GetContiguousAccess(int64_t aOffset, size_t aSize);
+
+ private:
+ ResourceItem* ResourceAt(uint32_t aIndex) const;
+
+ // Returns the index of the resource that contains the given
+ // logical offset. aResourceOffset will contain the offset into
+ // the resource at the given index returned if it is not null. If
+ // no such resource exists, returns GetSize() and aOffset is
+ // untouched.
+ uint32_t GetAtOffset(uint64_t aOffset, uint32_t* aResourceOffset) const;
+
+ ResourceItem* PopFront();
+
+ // Logical length of the resource.
+ uint64_t mLogicalLength;
+
+ // Logical offset into the resource of the first element in the queue.
+ uint64_t mOffset;
+};
+
+} // namespace mozilla
+
+#endif /* MOZILLA_RESOURCEQUEUE_H_ */