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diff --git a/dom/media/gmp/GMPSharedMemManager.h b/dom/media/gmp/GMPSharedMemManager.h
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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 GMPSharedMemManager_h_
+#define GMPSharedMemManager_h_
+
+#include "mozilla/ipc/Shmem.h"
+#include "nsTArray.h"
+
+namespace mozilla {
+namespace gmp {
+
+class GMPSharedMemManager;
+
+class GMPSharedMem
+{
+public:
+ typedef enum {
+ kGMPFrameData = 0,
+ kGMPEncodedData,
+ kGMPNumTypes
+ } GMPMemoryClasses;
+
+ // This is a heuristic - max of 10 free in the Child pool, plus those
+ // in-use for the encoder and decoder at the given moment and not yet
+ // returned to the parent pool (which is not included). If more than
+ // this are needed, we presume the client has either crashed or hung
+ // (perhaps temporarily).
+ static const uint32_t kGMPBufLimit = 20;
+
+ GMPSharedMem()
+ {
+ for (size_t i = 0; i < sizeof(mGmpAllocated)/sizeof(mGmpAllocated[0]); i++) {
+ mGmpAllocated[i] = 0;
+ }
+ }
+ virtual ~GMPSharedMem() {}
+
+ // Parent and child impls will differ here
+ virtual void CheckThread() = 0;
+
+protected:
+ friend class GMPSharedMemManager;
+
+ nsTArray<ipc::Shmem> mGmpFreelist[GMPSharedMem::kGMPNumTypes];
+ uint32_t mGmpAllocated[GMPSharedMem::kGMPNumTypes];
+};
+
+class GMPSharedMemManager
+{
+public:
+ explicit GMPSharedMemManager(GMPSharedMem *aData) : mData(aData) {}
+ virtual ~GMPSharedMemManager() {}
+
+ virtual bool MgrAllocShmem(GMPSharedMem::GMPMemoryClasses aClass, size_t aSize,
+ ipc::Shmem::SharedMemory::SharedMemoryType aType,
+ ipc::Shmem* aMem);
+ virtual bool MgrDeallocShmem(GMPSharedMem::GMPMemoryClasses aClass, ipc::Shmem& aMem);
+
+ // So we can know if data is "piling up" for the plugin - I.e. it's hung or crashed
+ virtual uint32_t NumInUse(GMPSharedMem::GMPMemoryClasses aClass);
+
+ // These have to be implemented using the AllocShmem/etc provided by the IPDL-generated interfaces,
+ // so have the Parent/Child implement them.
+ virtual bool Alloc(size_t aSize, ipc::Shmem::SharedMemory::SharedMemoryType aType, ipc::Shmem* aMem) = 0;
+ virtual void Dealloc(ipc::Shmem& aMem) = 0;
+
+private:
+ nsTArray<ipc::Shmem>& GetGmpFreelist(GMPSharedMem::GMPMemoryClasses aTypes)
+ {
+ return mData->mGmpFreelist[aTypes];
+ }
+
+ GMPSharedMem *mData;
+};
+
+} // namespace gmp
+} // namespace mozilla
+
+#endif // GMPSharedMemManager_h_